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-rw-r--r--drivers/usb/gadget/Kconfig50
-rw-r--r--drivers/usb/gadget/composite.c6
-rw-r--r--drivers/usb/gadget/configfs.c259
-rw-r--r--drivers/usb/gadget/function/Makefile8
-rw-r--r--drivers/usb/gadget/function/f_accessory.c1328
-rw-r--r--drivers/usb/gadget/function/f_audio_source.c1060
-rw-r--r--drivers/usb/gadget/function/f_midi.c66
-rw-r--r--drivers/usb/gadget/function/f_mtp.c1537
-rw-r--r--drivers/usb/gadget/function/f_mtp.h18
-rw-r--r--drivers/usb/gadget/function/f_ptp.c38
-rw-r--r--drivers/usb/gadget/function/f_rndis.c30
-rw-r--r--drivers/usb/gadget/function/rndis.c112
-rw-r--r--drivers/usb/gadget/function/rndis.h2
-rw-r--r--drivers/usb/gadget/function/u_ether.c301
-rw-r--r--drivers/usb/gadget/function/u_ether.h3
-rw-r--r--drivers/usb/phy/Kconfig17
-rw-r--r--drivers/usb/phy/Makefile2
-rw-r--r--drivers/usb/phy/class-dual-role.c529
-rw-r--r--drivers/usb/phy/otg-wakelock.c173
19 files changed, 5465 insertions, 74 deletions
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 33834aa09ed4..5cf6802b02ae 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -199,6 +199,18 @@ config USB_F_HID
config USB_F_PRINTER
tristate
+config USB_F_MTP
+ tristate
+
+config USB_F_PTP
+ tristate
+
+config USB_F_AUDIO_SRC
+ tristate
+
+config USB_F_ACC
+ tristate
+
choice
tristate "USB Gadget Drivers"
default USB_ETH
@@ -371,6 +383,44 @@ config USB_CONFIGFS_F_FS
implemented in kernel space (for instance Ethernet, serial or
mass storage) and other are implemented in user space.
+config USB_CONFIGFS_F_MTP
+ boolean "MTP gadget"
+ depends on USB_CONFIGFS
+ select USB_F_MTP
+ help
+ USB gadget MTP support
+
+config USB_CONFIGFS_F_PTP
+ boolean "PTP gadget"
+ depends on USB_CONFIGFS && USB_CONFIGFS_F_MTP
+ select USB_F_PTP
+ help
+ USB gadget PTP support
+
+config USB_CONFIGFS_F_ACC
+ boolean "Accessory gadget"
+ depends on USB_CONFIGFS
+ select USB_F_ACC
+ help
+ USB gadget Accessory support
+
+config USB_CONFIGFS_F_AUDIO_SRC
+ boolean "Audio Source gadget"
+ depends on USB_CONFIGFS && USB_CONFIGFS_F_ACC
+ depends on SND
+ select SND_PCM
+ select USB_F_AUDIO_SRC
+ help
+ USB gadget Audio Source support
+
+config USB_CONFIGFS_UEVENT
+ boolean "Uevent notification of Gadget state"
+ depends on USB_CONFIGFS
+ help
+ Enable uevent notifications to userspace when the gadget
+ state changes. The gadget can be in any of the following
+ three states: "CONNECTED/DISCONNECTED/CONFIGURED"
+
config USB_CONFIGFS_F_UAC1
bool "Audio Class 1.0"
depends on USB_CONFIGFS
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index e2641d4dfdd6..a5ebfa9a2f82 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1879,6 +1879,12 @@ void composite_disconnect(struct usb_gadget *gadget)
struct usb_composite_dev *cdev = get_gadget_data(gadget);
unsigned long flags;
+ if (cdev == NULL) {
+ WARN(1, "%s: Calling disconnect on a Gadget that is \
+ not connected\n", __func__);
+ return;
+ }
+
/* REVISIT: should we have config and device level
* disconnect callbacks?
*/
diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 163d305e1200..54849fe9cb01 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -9,6 +9,31 @@
#include "u_f.h"
#include "u_os_desc.h"
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+#include <linux/platform_device.h>
+#include <linux/kdev_t.h>
+#include <linux/usb/ch9.h>
+
+#ifdef CONFIG_USB_CONFIGFS_F_ACC
+extern int acc_ctrlrequest(struct usb_composite_dev *cdev,
+ const struct usb_ctrlrequest *ctrl);
+void acc_disconnect(void);
+#endif
+static struct class *android_class;
+static struct device *android_device;
+static int index;
+
+struct device *create_function_device(char *name)
+{
+ if (android_device && !IS_ERR(android_device))
+ return device_create(android_class, android_device,
+ MKDEV(0, index++), NULL, name);
+ else
+ return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(create_function_device);
+#endif
+
int check_user_usb_string(const char *name,
struct usb_gadget_strings *stringtab_dev)
{
@@ -62,6 +87,12 @@ struct gadget_info {
bool use_os_desc;
char b_vendor_code;
char qw_sign[OS_STRING_QW_SIGN_LEN];
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+ bool connected;
+ bool sw_connected;
+ struct work_struct work;
+ struct device *dev;
+#endif
};
static inline struct gadget_info *to_gadget_info(struct config_item *item)
@@ -266,7 +297,7 @@ static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
mutex_lock(&gi->lock);
- if (!strlen(name)) {
+ if (!strlen(name) || strcmp(name, "none") == 0) {
ret = unregister_gadget(gi);
if (ret)
goto err;
@@ -1373,6 +1404,60 @@ err_comp_cleanup:
return ret;
}
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+static void android_work(struct work_struct *data)
+{
+ struct gadget_info *gi = container_of(data, struct gadget_info, work);
+ struct usb_composite_dev *cdev = &gi->cdev;
+ char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL };
+ char *connected[2] = { "USB_STATE=CONNECTED", NULL };
+ char *configured[2] = { "USB_STATE=CONFIGURED", NULL };
+ /* 0-connected 1-configured 2-disconnected*/
+ bool status[3] = { false, false, false };
+ unsigned long flags;
+ bool uevent_sent = false;
+
+ spin_lock_irqsave(&cdev->lock, flags);
+ if (cdev->config)
+ status[1] = true;
+
+ if (gi->connected != gi->sw_connected) {
+ if (gi->connected)
+ status[0] = true;
+ else
+ status[2] = true;
+ gi->sw_connected = gi->connected;
+ }
+ spin_unlock_irqrestore(&cdev->lock, flags);
+
+ if (status[0]) {
+ kobject_uevent_env(&android_device->kobj,
+ KOBJ_CHANGE, connected);
+ pr_info("%s: sent uevent %s\n", __func__, connected[0]);
+ uevent_sent = true;
+ }
+
+ if (status[1]) {
+ kobject_uevent_env(&android_device->kobj,
+ KOBJ_CHANGE, configured);
+ pr_info("%s: sent uevent %s\n", __func__, configured[0]);
+ uevent_sent = true;
+ }
+
+ if (status[2]) {
+ kobject_uevent_env(&android_device->kobj,
+ KOBJ_CHANGE, disconnected);
+ pr_info("%s: sent uevent %s\n", __func__, disconnected[0]);
+ uevent_sent = true;
+ }
+
+ if (!uevent_sent) {
+ pr_info("%s: did not send uevent (%d %d %p)\n", __func__,
+ gi->connected, gi->sw_connected, cdev->config);
+ }
+}
+#endif
+
static void configfs_composite_unbind(struct usb_gadget *gadget)
{
struct usb_composite_dev *cdev;
@@ -1392,14 +1477,79 @@ static void configfs_composite_unbind(struct usb_gadget *gadget)
set_gadget_data(gadget, NULL);
}
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+static int android_setup(struct usb_gadget *gadget,
+ const struct usb_ctrlrequest *c)
+{
+ struct usb_composite_dev *cdev = get_gadget_data(gadget);
+ unsigned long flags;
+ struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
+ int value = -EOPNOTSUPP;
+ struct usb_function_instance *fi;
+
+ spin_lock_irqsave(&cdev->lock, flags);
+ if (!gi->connected) {
+ gi->connected = 1;
+ schedule_work(&gi->work);
+ }
+ spin_unlock_irqrestore(&cdev->lock, flags);
+ list_for_each_entry(fi, &gi->available_func, cfs_list) {
+ if (fi != NULL && fi->f != NULL && fi->f->setup != NULL) {
+ value = fi->f->setup(fi->f, c);
+ if (value >= 0)
+ break;
+ }
+ }
+
+#ifdef CONFIG_USB_CONFIGFS_F_ACC
+ if (value < 0)
+ value = acc_ctrlrequest(cdev, c);
+#endif
+
+ if (value < 0)
+ value = composite_setup(gadget, c);
+
+ spin_lock_irqsave(&cdev->lock, flags);
+ if (c->bRequest == USB_REQ_SET_CONFIGURATION &&
+ cdev->config) {
+ schedule_work(&gi->work);
+ }
+ spin_unlock_irqrestore(&cdev->lock, flags);
+
+ return value;
+}
+
+static void android_disconnect(struct usb_gadget *gadget)
+{
+ struct usb_composite_dev *cdev = get_gadget_data(gadget);
+ struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
+
+ /* accessory HID support can be active while the
+ accessory function is not actually enabled,
+ so we need to inform it when we are disconnected.
+ */
+
+#ifdef CONFIG_USB_CONFIGFS_F_ACC
+ acc_disconnect();
+#endif
+ gi->connected = 0;
+ schedule_work(&gi->work);
+ composite_disconnect(gadget);
+}
+#endif
+
static const struct usb_gadget_driver configfs_driver_template = {
.bind = configfs_composite_bind,
.unbind = configfs_composite_unbind,
-
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+ .setup = android_setup,
+ .reset = android_disconnect,
+ .disconnect = android_disconnect,
+#else
.setup = composite_setup,
.reset = composite_disconnect,
.disconnect = composite_disconnect,
-
+#endif
.suspend = composite_suspend,
.resume = composite_resume,
@@ -1410,6 +1560,89 @@ static const struct usb_gadget_driver configfs_driver_template = {
},
};
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+static ssize_t state_show(struct device *pdev, struct device_attribute *attr,
+ char *buf)
+{
+ struct gadget_info *dev = dev_get_drvdata(pdev);
+ struct usb_composite_dev *cdev;
+ char *state = "DISCONNECTED";
+ unsigned long flags;
+
+ if (!dev)
+ goto out;
+
+ cdev = &dev->cdev;
+
+ if (!cdev)
+ goto out;
+
+ spin_lock_irqsave(&cdev->lock, flags);
+ if (cdev->config)
+ state = "CONFIGURED";
+ else if (dev->connected)
+ state = "CONNECTED";
+ spin_unlock_irqrestore(&cdev->lock, flags);
+out:
+ return sprintf(buf, "%s\n", state);
+}
+
+static DEVICE_ATTR(state, S_IRUGO, state_show, NULL);
+
+static struct device_attribute *android_usb_attributes[] = {
+ &dev_attr_state,
+ NULL
+};
+
+static int android_device_create(struct gadget_info *gi)
+{
+ struct device_attribute **attrs;
+ struct device_attribute *attr;
+
+ INIT_WORK(&gi->work, android_work);
+ android_device = device_create(android_class, NULL,
+ MKDEV(0, 0), NULL, "android0");
+ if (IS_ERR(android_device))
+ return PTR_ERR(android_device);
+
+ dev_set_drvdata(android_device, gi);
+
+ attrs = android_usb_attributes;
+ while ((attr = *attrs++)) {
+ int err;
+
+ err = device_create_file(android_device, attr);
+ if (err) {
+ device_destroy(android_device->class,
+ android_device->devt);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void android_device_destroy(void)
+{
+ struct device_attribute **attrs;
+ struct device_attribute *attr;
+
+ attrs = android_usb_attributes;
+ while ((attr = *attrs++))
+ device_remove_file(android_device, attr);
+ device_destroy(android_device->class, android_device->devt);
+}
+#else
+static inline int android_device_create(struct gadget_info *gi)
+{
+ return 0;
+}
+
+static inline void android_device_destroy(void)
+{
+}
+#endif
+
static struct config_group *gadgets_make(
struct config_group *group,
const char *name)
@@ -1419,7 +1652,6 @@ static struct config_group *gadgets_make(
gi = kzalloc(sizeof(*gi), GFP_KERNEL);
if (!gi)
return ERR_PTR(-ENOMEM);
-
gi->group.default_groups = gi->default_groups;
gi->group.default_groups[0] = &gi->functions_group;
gi->group.default_groups[1] = &gi->configs_group;
@@ -1458,9 +1690,13 @@ static struct config_group *gadgets_make(
if (!gi->composite.gadget_driver.function)
goto err;
+ if (android_device_create(gi) < 0)
+ goto err;
+
config_group_init_type_name(&gi->group, name,
&gadget_root_type);
return &gi->group;
+
err:
kfree(gi);
return ERR_PTR(-ENOMEM);
@@ -1469,6 +1705,7 @@ err:
static void gadgets_drop(struct config_group *group, struct config_item *item)
{
config_item_put(item);
+ android_device_destroy();
}
static struct configfs_group_operations gadgets_ops = {
@@ -1495,7 +1732,9 @@ void unregister_gadget_item(struct config_item *item)
{
struct gadget_info *gi = to_gadget_info(item);
+ mutex_lock(&gi->lock);
unregister_gadget(gi);
+ mutex_unlock(&gi->lock);
}
EXPORT_SYMBOL_GPL(unregister_gadget_item);
@@ -1506,6 +1745,13 @@ static int __init gadget_cfs_init(void)
config_group_init(&gadget_subsys.su_group);
ret = configfs_register_subsystem(&gadget_subsys);
+
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+ android_class = class_create(THIS_MODULE, "android_usb");
+ if (IS_ERR(android_class))
+ return PTR_ERR(android_class);
+#endif
+
return ret;
}
module_init(gadget_cfs_init);
@@ -1513,5 +1759,10 @@ module_init(gadget_cfs_init);
static void __exit gadget_cfs_exit(void)
{
configfs_unregister_subsystem(&gadget_subsys);
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+ if (!IS_ERR(android_class))
+ class_destroy(android_class);
+#endif
+
}
module_exit(gadget_cfs_exit);
diff --git a/drivers/usb/gadget/function/Makefile b/drivers/usb/gadget/function/Makefile
index bd7def576955..1cd544beef63 100644
--- a/drivers/usb/gadget/function/Makefile
+++ b/drivers/usb/gadget/function/Makefile
@@ -44,3 +44,11 @@ usb_f_hid-y := f_hid.o
obj-$(CONFIG_USB_F_HID) += usb_f_hid.o
usb_f_printer-y := f_printer.o
obj-$(CONFIG_USB_F_PRINTER) += usb_f_printer.o
+usb_f_mtp-y := f_mtp.o
+obj-$(CONFIG_USB_F_MTP) += usb_f_mtp.o
+usb_f_ptp-y := f_ptp.o
+obj-$(CONFIG_USB_F_PTP) += usb_f_ptp.o
+usb_f_audio_source-y := f_audio_source.o
+obj-$(CONFIG_USB_F_AUDIO_SRC) += usb_f_audio_source.o
+usb_f_accessory-y := f_accessory.o
+obj-$(CONFIG_USB_F_ACC) += usb_f_accessory.o
diff --git a/drivers/usb/gadget/function/f_accessory.c b/drivers/usb/gadget/function/f_accessory.c
new file mode 100644
index 000000000000..9d3ec0e37475
--- /dev/null
+++ b/drivers/usb/gadget/function/f_accessory.c
@@ -0,0 +1,1328 @@
+/*
+ * Gadget Function Driver for Android USB accessories
+ *
+ * Copyright (C) 2011 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* #define DEBUG */
+/* #define VERBOSE_DEBUG */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+
+#include <linux/types.h>
+#include <linux/file.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+
+#include <linux/hid.h>
+#include <linux/hiddev.h>
+#include <linux/usb.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/f_accessory.h>
+
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+
+#define MAX_INST_NAME_LEN 40
+#define BULK_BUFFER_SIZE 16384
+#define ACC_STRING_SIZE 256
+
+#define PROTOCOL_VERSION 2
+
+/* String IDs */
+#define INTERFACE_STRING_INDEX 0
+
+/* number of tx and rx requests to allocate */
+#define TX_REQ_MAX 4
+#define RX_REQ_MAX 2
+
+struct acc_hid_dev {
+ struct list_head list;
+ struct hid_device *hid;
+ struct acc_dev *dev;
+ /* accessory defined ID */
+ int id;
+ /* HID report descriptor */
+ u8 *report_desc;
+ /* length of HID report descriptor */
+ int report_desc_len;
+ /* number of bytes of report_desc we have received so far */
+ int report_desc_offset;
+};
+
+struct acc_dev {
+ struct usb_function function;
+ struct usb_composite_dev *cdev;
+ spinlock_t lock;
+
+ struct usb_ep *ep_in;
+ struct usb_ep *ep_out;
+
+ /* set to 1 when we connect */
+ int online:1;
+ /* Set to 1 when we disconnect.
+ * Not cleared until our file is closed.
+ */
+ int disconnected:1;
+
+ /* strings sent by the host */
+ char manufacturer[ACC_STRING_SIZE];
+ char model[ACC_STRING_SIZE];
+ char description[ACC_STRING_SIZE];
+ char version[ACC_STRING_SIZE];
+ char uri[ACC_STRING_SIZE];
+ char serial[ACC_STRING_SIZE];
+
+ /* for acc_complete_set_string */
+ int string_index;
+
+ /* set to 1 if we have a pending start request */
+ int start_requested;
+
+ int audio_mode;
+
+ /* synchronize access to our device file */
+ atomic_t open_excl;
+
+ struct list_head tx_idle;
+
+ wait_queue_head_t read_wq;
+ wait_queue_head_t write_wq;
+ struct usb_request *rx_req[RX_REQ_MAX];
+ int rx_done;
+
+ /* delayed work for handling ACCESSORY_START */
+ struct delayed_work start_work;
+
+ /* worker for registering and unregistering hid devices */
+ struct work_struct hid_work;
+
+ /* list of active HID devices */
+ struct list_head hid_list;
+
+ /* list of new HID devices to register */
+ struct list_head new_hid_list;
+
+ /* list of dead HID devices to unregister */
+ struct list_head dead_hid_list;
+};
+
+static struct usb_interface_descriptor acc_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
+ .bInterfaceProtocol = 0,
+};
+
+static struct usb_endpoint_descriptor acc_highspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor acc_highspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor acc_fullspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor acc_fullspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_descriptor_header *fs_acc_descs[] = {
+ (struct usb_descriptor_header *) &acc_interface_desc,
+ (struct usb_descriptor_header *) &acc_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &acc_fullspeed_out_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_acc_descs[] = {
+ (struct usb_descriptor_header *) &acc_interface_desc,
+ (struct usb_descriptor_header *) &acc_highspeed_in_desc,
+ (struct usb_descriptor_header *) &acc_highspeed_out_desc,
+ NULL,
+};
+
+static struct usb_string acc_string_defs[] = {
+ [INTERFACE_STRING_INDEX].s = "Android Accessory Interface",
+ { }, /* end of list */
+};
+
+static struct usb_gadget_strings acc_string_table = {
+ .language = 0x0409, /* en-US */
+ .strings = acc_string_defs,
+};
+
+static struct usb_gadget_strings *acc_strings[] = {
+ &acc_string_table,
+ NULL,
+};
+
+/* temporary variable used between acc_open() and acc_gadget_bind() */
+static struct acc_dev *_acc_dev;
+
+struct acc_instance {
+ struct usb_function_instance func_inst;
+ const char *name;
+};
+
+static inline struct acc_dev *func_to_dev(struct usb_function *f)
+{
+ return container_of(f, struct acc_dev, function);
+}
+
+static struct usb_request *acc_request_new(struct usb_ep *ep, int buffer_size)
+{
+ struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+
+ if (!req)
+ return NULL;
+
+ /* now allocate buffers for the requests */
+ req->buf = kmalloc(buffer_size, GFP_KERNEL);
+ if (!req->buf) {
+ usb_ep_free_request(ep, req);
+ return NULL;
+ }
+
+ return req;
+}
+
+static void acc_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+ if (req) {
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+ }
+}
+
+/* add a request to the tail of a list */
+static void req_put(struct acc_dev *dev, struct list_head *head,
+ struct usb_request *req)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ list_add_tail(&req->list, head);
+ spin_unlock_irqrestore(&dev->lock, flags);
+}
+
+/* remove a request from the head of a list */
+static struct usb_request *req_get(struct acc_dev *dev, struct list_head *head)
+{
+ unsigned long flags;
+ struct usb_request *req;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ if (list_empty(head)) {
+ req = 0;
+ } else {
+ req = list_first_entry(head, struct usb_request, list);
+ list_del(&req->list);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return req;
+}
+
+static void acc_set_disconnected(struct acc_dev *dev)
+{
+ dev->online = 0;
+ dev->disconnected = 1;
+}
+
+static void acc_complete_in(struct usb_ep *ep, struct usb_request *req)
+{
+ struct acc_dev *dev = _acc_dev;
+
+ if (req->status == -ESHUTDOWN) {
+ pr_debug("acc_complete_in set disconnected");
+ acc_set_disconnected(dev);
+ }
+
+ req_put(dev, &dev->tx_idle, req);
+
+ wake_up(&dev->write_wq);
+}
+
+static void acc_complete_out(struct usb_ep *ep, struct usb_request *req)
+{
+ struct acc_dev *dev = _acc_dev;
+
+ dev->rx_done = 1;
+ if (req->status == -ESHUTDOWN) {
+ pr_debug("acc_complete_out set disconnected");
+ acc_set_disconnected(dev);
+ }
+
+ wake_up(&dev->read_wq);
+}
+
+static void acc_complete_set_string(struct usb_ep *ep, struct usb_request *req)
+{
+ struct acc_dev *dev = ep->driver_data;
+ char *string_dest = NULL;
+ int length = req->actual;
+
+ if (req->status != 0) {
+ pr_err("acc_complete_set_string, err %d\n", req->status);
+ return;
+ }
+
+ switch (dev->string_index) {
+ case ACCESSORY_STRING_MANUFACTURER:
+ string_dest = dev->manufacturer;
+ break;
+ case ACCESSORY_STRING_MODEL:
+ string_dest = dev->model;
+ break;
+ case ACCESSORY_STRING_DESCRIPTION:
+ string_dest = dev->description;
+ break;
+ case ACCESSORY_STRING_VERSION:
+ string_dest = dev->version;
+ break;
+ case ACCESSORY_STRING_URI:
+ string_dest = dev->uri;
+ break;
+ case ACCESSORY_STRING_SERIAL:
+ string_dest = dev->serial;
+ break;
+ }
+ if (string_dest) {
+ unsigned long flags;
+
+ if (length >= ACC_STRING_SIZE)
+ length = ACC_STRING_SIZE - 1;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ memcpy(string_dest, req->buf, length);
+ /* ensure zero termination */
+ string_dest[length] = 0;
+ spin_unlock_irqrestore(&dev->lock, flags);
+ } else {
+ pr_err("unknown accessory string index %d\n",
+ dev->string_index);
+ }
+}
+
+static void acc_complete_set_hid_report_desc(struct usb_ep *ep,
+ struct usb_request *req)
+{
+ struct acc_hid_dev *hid = req->context;
+ struct acc_dev *dev = hid->dev;
+ int length = req->actual;
+
+ if (req->status != 0) {
+ pr_err("acc_complete_set_hid_report_desc, err %d\n",
+ req->status);
+ return;
+ }
+
+ memcpy(hid->report_desc + hid->report_desc_offset, req->buf, length);
+ hid->report_desc_offset += length;
+ if (hid->report_desc_offset == hid->report_desc_len) {
+ /* After we have received the entire report descriptor
+ * we schedule work to initialize the HID device
+ */
+ schedule_work(&dev->hid_work);
+ }
+}
+
+static void acc_complete_send_hid_event(struct usb_ep *ep,
+ struct usb_request *req)
+{
+ struct acc_hid_dev *hid = req->context;
+ int length = req->actual;
+
+ if (req->status != 0) {
+ pr_err("acc_complete_send_hid_event, err %d\n", req->status);
+ return;
+ }
+
+ hid_report_raw_event(hid->hid, HID_INPUT_REPORT, req->buf, length, 1);
+}
+
+static int acc_hid_parse(struct hid_device *hid)
+{
+ struct acc_hid_dev *hdev = hid->driver_data;
+
+ hid_parse_report(hid, hdev->report_desc, hdev->report_desc_len);
+ return 0;
+}
+
+static int acc_hid_start(struct hid_device *hid)
+{
+ return 0;
+}
+
+static void acc_hid_stop(struct hid_device *hid)
+{
+}
+
+static int acc_hid_open(struct hid_device *hid)
+{
+ return 0;
+}
+
+static void acc_hid_close(struct hid_device *hid)
+{
+}
+
+static int acc_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
+ __u8 *buf, size_t len, unsigned char rtype, int reqtype)
+{
+ return 0;
+}
+
+static struct hid_ll_driver acc_hid_ll_driver = {
+ .parse = acc_hid_parse,
+ .start = acc_hid_start,
+ .stop = acc_hid_stop,
+ .open = acc_hid_open,
+ .close = acc_hid_close,
+ .raw_request = acc_hid_raw_request,
+};
+
+static struct acc_hid_dev *acc_hid_new(struct acc_dev *dev,
+ int id, int desc_len)
+{
+ struct acc_hid_dev *hdev;
+
+ hdev = kzalloc(sizeof(*hdev), GFP_ATOMIC);
+ if (!hdev)
+ return NULL;
+ hdev->report_desc = kzalloc(desc_len, GFP_ATOMIC);
+ if (!hdev->report_desc) {
+ kfree(hdev);
+ return NULL;
+ }
+ hdev->dev = dev;
+ hdev->id = id;
+ hdev->report_desc_len = desc_len;
+
+ return hdev;
+}
+
+static struct acc_hid_dev *acc_hid_get(struct list_head *list, int id)
+{
+ struct acc_hid_dev *hid;
+
+ list_for_each_entry(hid, list, list) {
+ if (hid->id == id)
+ return hid;
+ }
+ return NULL;
+}
+
+static int acc_register_hid(struct acc_dev *dev, int id, int desc_length)
+{
+ struct acc_hid_dev *hid;
+ unsigned long flags;
+
+ /* report descriptor length must be > 0 */
+ if (desc_length <= 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ /* replace HID if one already exists with this ID */
+ hid = acc_hid_get(&dev->hid_list, id);
+ if (!hid)
+ hid = acc_hid_get(&dev->new_hid_list, id);
+ if (hid)
+ list_move(&hid->list, &dev->dead_hid_list);
+
+ hid = acc_hid_new(dev, id, desc_length);
+ if (!hid) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENOMEM;
+ }
+
+ list_add(&hid->list, &dev->new_hid_list);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* schedule work to register the HID device */
+ schedule_work(&dev->hid_work);
+ return 0;
+}
+
+static int acc_unregister_hid(struct acc_dev *dev, int id)
+{
+ struct acc_hid_dev *hid;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ hid = acc_hid_get(&dev->hid_list, id);
+ if (!hid)
+ hid = acc_hid_get(&dev->new_hid_list, id);
+ if (!hid) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -EINVAL;
+ }
+
+ list_move(&hid->list, &dev->dead_hid_list);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ schedule_work(&dev->hid_work);
+ return 0;
+}
+
+static int create_bulk_endpoints(struct acc_dev *dev,
+ struct usb_endpoint_descriptor *in_desc,
+ struct usb_endpoint_descriptor *out_desc)
+{
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req;
+ struct usb_ep *ep;
+ int i;
+
+ DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
+
+ ep = usb_ep_autoconfig(cdev->gadget, in_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_in = ep;
+
+ ep = usb_ep_autoconfig(cdev->gadget, out_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_out = ep;
+
+ /* now allocate requests for our endpoints */
+ for (i = 0; i < TX_REQ_MAX; i++) {
+ req = acc_request_new(dev->ep_in, BULK_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = acc_complete_in;
+ req_put(dev, &dev->tx_idle, req);
+ }
+ for (i = 0; i < RX_REQ_MAX; i++) {
+ req = acc_request_new(dev->ep_out, BULK_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = acc_complete_out;
+ dev->rx_req[i] = req;
+ }
+
+ return 0;
+
+fail:
+ pr_err("acc_bind() could not allocate requests\n");
+ while ((req = req_get(dev, &dev->tx_idle)))
+ acc_request_free(req, dev->ep_in);
+ for (i = 0; i < RX_REQ_MAX; i++)
+ acc_request_free(dev->rx_req[i], dev->ep_out);
+ return -1;
+}
+
+static ssize_t acc_read(struct file *fp, char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct acc_dev *dev = fp->private_data;
+ struct usb_request *req;
+ ssize_t r = count;
+ unsigned xfer;
+ int ret = 0;
+
+ pr_debug("acc_read(%zu)\n", count);
+
+ if (dev->disconnected) {
+ pr_debug("acc_read disconnected");
+ return -ENODEV;
+ }
+
+ if (count > BULK_BUFFER_SIZE)
+ count = BULK_BUFFER_SIZE;
+
+ /* we will block until we're online */
+ pr_debug("acc_read: waiting for online\n");
+ ret = wait_event_interruptible(dev->read_wq, dev->online);
+ if (ret < 0) {
+ r = ret;
+ goto done;
+ }
+
+ if (dev->rx_done) {
+ // last req cancelled. try to get it.
+ req = dev->rx_req[0];
+ goto copy_data;
+ }
+
+requeue_req:
+ /* queue a request */
+ req = dev->rx_req[0];
+ req->length = count;
+ dev->rx_done = 0;
+ ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
+ if (ret < 0) {
+ r = -EIO;
+ goto done;
+ } else {
+ pr_debug("rx %p queue\n", req);
+ }
+
+ /* wait for a request to complete */
+ ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
+ if (ret < 0) {
+ r = ret;
+ ret = usb_ep_dequeue(dev->ep_out, req);
+ if (ret != 0) {
+ // cancel failed. There can be a data already received.
+ // it will be retrieved in the next read.
+ pr_debug("acc_read: cancelling failed %d", ret);
+ }
+ goto done;
+ }
+
+copy_data:
+ dev->rx_done = 0;
+ if (dev->online) {
+ /* If we got a 0-len packet, throw it back and try again. */
+ if (req->actual == 0)
+ goto requeue_req;
+
+ pr_debug("rx %p %u\n", req, req->actual);
+ xfer = (req->actual < count) ? req->actual : count;
+ r = xfer;
+ if (copy_to_user(buf, req->buf, xfer))
+ r = -EFAULT;
+ } else
+ r = -EIO;
+
+done:
+ pr_debug("acc_read returning %zd\n", r);
+ return r;
+}
+
+static ssize_t acc_write(struct file *fp, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct acc_dev *dev = fp->private_data;
+ struct usb_request *req = 0;
+ ssize_t r = count;
+ unsigned xfer;
+ int ret;
+
+ pr_debug("acc_write(%zu)\n", count);
+
+ if (!dev->online || dev->disconnected) {
+ pr_debug("acc_write disconnected or not online");
+ return -ENODEV;
+ }
+
+ while (count > 0) {
+ if (!dev->online) {
+ pr_debug("acc_write dev->error\n");
+ r = -EIO;
+ break;
+ }
+
+ /* get an idle tx request to use */
+ req = 0;
+ ret = wait_event_interruptible(dev->write_wq,
+ ((req = req_get(dev, &dev->tx_idle)) || !dev->online));
+ if (!req) {
+ r = ret;
+ break;
+ }
+
+ if (count > BULK_BUFFER_SIZE) {
+ xfer = BULK_BUFFER_SIZE;
+ /* ZLP, They will be more TX requests so not yet. */
+ req->zero = 0;
+ } else {
+ xfer = count;
+ /* If the data length is a multple of the
+ * maxpacket size then send a zero length packet(ZLP).
+ */
+ req->zero = ((xfer % dev->ep_in->maxpacket) == 0);
+ }
+ if (copy_from_user(req->buf, buf, xfer)) {
+ r = -EFAULT;
+ break;
+ }
+
+ req->length = xfer;
+ ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
+ if (ret < 0) {
+ pr_debug("acc_write: xfer error %d\n", ret);
+ r = -EIO;
+ break;
+ }
+
+ buf += xfer;
+ count -= xfer;
+
+ /* zero this so we don't try to free it on error exit */
+ req = 0;
+ }
+
+ if (req)
+ req_put(dev, &dev->tx_idle, req);
+
+ pr_debug("acc_write returning %zd\n", r);
+ return r;
+}
+
+static long acc_ioctl(struct file *fp, unsigned code, unsigned long value)
+{
+ struct acc_dev *dev = fp->private_data;
+ char *src = NULL;
+ int ret;
+
+ switch (code) {
+ case ACCESSORY_GET_STRING_MANUFACTURER:
+ src = dev->manufacturer;
+ break;
+ case ACCESSORY_GET_STRING_MODEL:
+ src = dev->model;
+ break;
+ case ACCESSORY_GET_STRING_DESCRIPTION:
+ src = dev->description;
+ break;
+ case ACCESSORY_GET_STRING_VERSION:
+ src = dev->version;
+ break;
+ case ACCESSORY_GET_STRING_URI:
+ src = dev->uri;
+ break;
+ case ACCESSORY_GET_STRING_SERIAL:
+ src = dev->serial;
+ break;
+ case ACCESSORY_IS_START_REQUESTED:
+ return dev->start_requested;
+ case ACCESSORY_GET_AUDIO_MODE:
+ return dev->audio_mode;
+ }
+ if (!src)
+ return -EINVAL;
+
+ ret = strlen(src) + 1;
+ if (copy_to_user((void __user *)value, src, ret))
+ ret = -EFAULT;
+ return ret;
+}
+
+static int acc_open(struct inode *ip, struct file *fp)
+{
+ printk(KERN_INFO "acc_open\n");
+ if (atomic_xchg(&_acc_dev->open_excl, 1))
+ return -EBUSY;
+
+ _acc_dev->disconnected = 0;
+ fp->private_data = _acc_dev;
+ return 0;
+}
+
+static int acc_release(struct inode *ip, struct file *fp)
+{
+ printk(KERN_INFO "acc_release\n");
+
+ WARN_ON(!atomic_xchg(&_acc_dev->open_excl, 0));
+ _acc_dev->disconnected = 0;
+ return 0;
+}
+
+/* file operations for /dev/usb_accessory */
+static const struct file_operations acc_fops = {
+ .owner = THIS_MODULE,
+ .read = acc_read,
+ .write = acc_write,
+ .unlocked_ioctl = acc_ioctl,
+ .open = acc_open,
+ .release = acc_release,
+};
+
+static int acc_hid_probe(struct hid_device *hdev,
+ const struct hid_device_id *id)
+{
+ int ret;
+
+ ret = hid_parse(hdev);
+ if (ret)
+ return ret;
+ return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+}
+
+static struct miscdevice acc_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "usb_accessory",
+ .fops = &acc_fops,
+};
+
+static const struct hid_device_id acc_hid_table[] = {
+ { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
+ { }
+};
+
+static struct hid_driver acc_hid_driver = {
+ .name = "USB accessory",
+ .id_table = acc_hid_table,
+ .probe = acc_hid_probe,
+};
+
+int acc_ctrlrequest(struct usb_composite_dev *cdev,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct acc_dev *dev = _acc_dev;
+ int value = -EOPNOTSUPP;
+ struct acc_hid_dev *hid;
+ int offset;
+ u8 b_requestType = ctrl->bRequestType;
+ u8 b_request = ctrl->bRequest;
+ u16 w_index = le16_to_cpu(ctrl->wIndex);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+ unsigned long flags;
+
+/*
+ printk(KERN_INFO "acc_ctrlrequest "
+ "%02x.%02x v%04x i%04x l%u\n",
+ b_requestType, b_request,
+ w_value, w_index, w_length);
+*/
+
+ if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) {
+ if (b_request == ACCESSORY_START) {
+ dev->start_requested = 1;
+ schedule_delayed_work(
+ &dev->start_work, msecs_to_jiffies(10));
+ value = 0;
+ } else if (b_request == ACCESSORY_SEND_STRING) {
+ dev->string_index = w_index;
+ cdev->gadget->ep0->driver_data = dev;
+ cdev->req->complete = acc_complete_set_string;
+ value = w_length;
+ } else if (b_request == ACCESSORY_SET_AUDIO_MODE &&
+ w_index == 0 && w_length == 0) {
+ dev->audio_mode = w_value;
+ value = 0;
+ } else if (b_request == ACCESSORY_REGISTER_HID) {
+ value = acc_register_hid(dev, w_value, w_index);
+ } else if (b_request == ACCESSORY_UNREGISTER_HID) {
+ value = acc_unregister_hid(dev, w_value);
+ } else if (b_request == ACCESSORY_SET_HID_REPORT_DESC) {
+ spin_lock_irqsave(&dev->lock, flags);
+ hid = acc_hid_get(&dev->new_hid_list, w_value);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ if (!hid) {
+ value = -EINVAL;
+ goto err;
+ }
+ offset = w_index;
+ if (offset != hid->report_desc_offset
+ || offset + w_length > hid->report_desc_len) {
+ value = -EINVAL;
+ goto err;
+ }
+ cdev->req->context = hid;
+ cdev->req->complete = acc_complete_set_hid_report_desc;
+ value = w_length;
+ } else if (b_request == ACCESSORY_SEND_HID_EVENT) {
+ spin_lock_irqsave(&dev->lock, flags);
+ hid = acc_hid_get(&dev->hid_list, w_value);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ if (!hid) {
+ value = -EINVAL;
+ goto err;
+ }
+ cdev->req->context = hid;
+ cdev->req->complete = acc_complete_send_hid_event;
+ value = w_length;
+ }
+ } else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
+ if (b_request == ACCESSORY_GET_PROTOCOL) {
+ *((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
+ value = sizeof(u16);
+
+ /* clear any string left over from a previous session */
+ memset(dev->manufacturer, 0, sizeof(dev->manufacturer));
+ memset(dev->model, 0, sizeof(dev->model));
+ memset(dev->description, 0, sizeof(dev->description));
+ memset(dev->version, 0, sizeof(dev->version));
+ memset(dev->uri, 0, sizeof(dev->uri));
+ memset(dev->serial, 0, sizeof(dev->serial));
+ dev->start_requested = 0;
+ dev->audio_mode = 0;
+ }
+ }
+
+ if (value >= 0) {
+ cdev->req->zero = 0;
+ cdev->req->length = value;
+ value = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
+ if (value < 0)
+ ERROR(cdev, "%s setup response queue error\n",
+ __func__);
+ }
+
+err:
+ if (value == -EOPNOTSUPP)
+ VDBG(cdev,
+ "unknown class-specific control req "
+ "%02x.%02x v%04x i%04x l%u\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ return value;
+}
+EXPORT_SYMBOL_GPL(acc_ctrlrequest);
+
+static int
+__acc_function_bind(struct usb_configuration *c,
+ struct usb_function *f, bool configfs)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct acc_dev *dev = func_to_dev(f);
+ int id;
+ int ret;
+
+ DBG(cdev, "acc_function_bind dev: %p\n", dev);
+
+ if (configfs) {
+ if (acc_string_defs[INTERFACE_STRING_INDEX].id == 0) {
+ ret = usb_string_id(c->cdev);
+ if (ret < 0)
+ return ret;
+ acc_string_defs[INTERFACE_STRING_INDEX].id = ret;
+ acc_interface_desc.iInterface = ret;
+ }
+ dev->cdev = c->cdev;
+ }
+ ret = hid_register_driver(&acc_hid_driver);
+ if (ret)
+ return ret;
+
+ dev->start_requested = 0;
+
+ /* allocate interface ID(s) */
+ id = usb_interface_id(c, f);
+ if (id < 0)
+ return id;
+ acc_interface_desc.bInterfaceNumber = id;
+
+ /* allocate endpoints */
+ ret = create_bulk_endpoints(dev, &acc_fullspeed_in_desc,
+ &acc_fullspeed_out_desc);
+ if (ret)
+ return ret;
+
+ /* support high speed hardware */
+ if (gadget_is_dualspeed(c->cdev->gadget)) {
+ acc_highspeed_in_desc.bEndpointAddress =
+ acc_fullspeed_in_desc.bEndpointAddress;
+ acc_highspeed_out_desc.bEndpointAddress =
+ acc_fullspeed_out_desc.bEndpointAddress;
+ }
+
+ DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
+ gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
+ f->name, dev->ep_in->name, dev->ep_out->name);
+ return 0;
+}
+
+static int
+acc_function_bind_configfs(struct usb_configuration *c,
+ struct usb_function *f) {
+ return __acc_function_bind(c, f, true);
+}
+
+static void
+kill_all_hid_devices(struct acc_dev *dev)
+{
+ struct acc_hid_dev *hid;
+ struct list_head *entry, *temp;
+ unsigned long flags;
+
+ /* do nothing if usb accessory device doesn't exist */
+ if (!dev)
+ return;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ list_for_each_safe(entry, temp, &dev->hid_list) {
+ hid = list_entry(entry, struct acc_hid_dev, list);
+ list_del(&hid->list);
+ list_add(&hid->list, &dev->dead_hid_list);
+ }
+ list_for_each_safe(entry, temp, &dev->new_hid_list) {
+ hid = list_entry(entry, struct acc_hid_dev, list);
+ list_del(&hid->list);
+ list_add(&hid->list, &dev->dead_hid_list);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ schedule_work(&dev->hid_work);
+}
+
+static void
+acc_hid_unbind(struct acc_dev *dev)
+{
+ hid_unregister_driver(&acc_hid_driver);
+ kill_all_hid_devices(dev);
+}
+
+static void
+acc_function_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct acc_dev *dev = func_to_dev(f);
+ struct usb_request *req;
+ int i;
+
+ while ((req = req_get(dev, &dev->tx_idle)))
+ acc_request_free(req, dev->ep_in);
+ for (i = 0; i < RX_REQ_MAX; i++)
+ acc_request_free(dev->rx_req[i], dev->ep_out);
+
+ acc_hid_unbind(dev);
+}
+
+static void acc_start_work(struct work_struct *data)
+{
+ char *envp[2] = { "ACCESSORY=START", NULL };
+
+ kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp);
+}
+
+static int acc_hid_init(struct acc_hid_dev *hdev)
+{
+ struct hid_device *hid;
+ int ret;
+
+ hid = hid_allocate_device();
+ if (IS_ERR(hid))
+ return PTR_ERR(hid);
+
+ hid->ll_driver = &acc_hid_ll_driver;
+ hid->dev.parent = acc_device.this_device;
+
+ hid->bus = BUS_USB;
+ hid->vendor = HID_ANY_ID;
+ hid->product = HID_ANY_ID;
+ hid->driver_data = hdev;
+ ret = hid_add_device(hid);
+ if (ret) {
+ pr_err("can't add hid device: %d\n", ret);
+ hid_destroy_device(hid);
+ return ret;
+ }
+
+ hdev->hid = hid;
+ return 0;
+}
+
+static void acc_hid_delete(struct acc_hid_dev *hid)
+{
+ kfree(hid->report_desc);
+ kfree(hid);
+}
+
+static void acc_hid_work(struct work_struct *data)
+{
+ struct acc_dev *dev = _acc_dev;
+ struct list_head *entry, *temp;
+ struct acc_hid_dev *hid;
+ struct list_head new_list, dead_list;
+ unsigned long flags;
+
+ INIT_LIST_HEAD(&new_list);
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* copy hids that are ready for initialization to new_list */
+ list_for_each_safe(entry, temp, &dev->new_hid_list) {
+ hid = list_entry(entry, struct acc_hid_dev, list);
+ if (hid->report_desc_offset == hid->report_desc_len)
+ list_move(&hid->list, &new_list);
+ }
+
+ if (list_empty(&dev->dead_hid_list)) {
+ INIT_LIST_HEAD(&dead_list);
+ } else {
+ /* move all of dev->dead_hid_list to dead_list */
+ dead_list.prev = dev->dead_hid_list.prev;
+ dead_list.next = dev->dead_hid_list.next;
+ dead_list.next->prev = &dead_list;
+ dead_list.prev->next = &dead_list;
+ INIT_LIST_HEAD(&dev->dead_hid_list);
+ }
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* register new HID devices */
+ list_for_each_safe(entry, temp, &new_list) {
+ hid = list_entry(entry, struct acc_hid_dev, list);
+ if (acc_hid_init(hid)) {
+ pr_err("can't add HID device %p\n", hid);
+ acc_hid_delete(hid);
+ } else {
+ spin_lock_irqsave(&dev->lock, flags);
+ list_move(&hid->list, &dev->hid_list);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ }
+ }
+
+ /* remove dead HID devices */
+ list_for_each_safe(entry, temp, &dead_list) {
+ hid = list_entry(entry, struct acc_hid_dev, list);
+ list_del(&hid->list);
+ if (hid->hid)
+ hid_destroy_device(hid->hid);
+ acc_hid_delete(hid);
+ }
+}
+
+static int acc_function_set_alt(struct usb_function *f,
+ unsigned intf, unsigned alt)
+{
+ struct acc_dev *dev = func_to_dev(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int ret;
+
+ DBG(cdev, "acc_function_set_alt intf: %d alt: %d\n", intf, alt);
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_in);
+ if (ret)
+ return ret;
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_out);
+ if (ret) {
+ usb_ep_disable(dev->ep_in);
+ return ret;
+ }
+
+ dev->online = 1;
+
+ /* readers may be blocked waiting for us to go online */
+ wake_up(&dev->read_wq);
+ return 0;
+}
+
+static void acc_function_disable(struct usb_function *f)
+{
+ struct acc_dev *dev = func_to_dev(f);
+ struct usb_composite_dev *cdev = dev->cdev;
+
+ DBG(cdev, "acc_function_disable\n");
+ acc_set_disconnected(dev);
+ usb_ep_disable(dev->ep_in);
+ usb_ep_disable(dev->ep_out);
+
+ /* readers may be blocked waiting for us to go online */
+ wake_up(&dev->read_wq);
+
+ VDBG(cdev, "%s disabled\n", dev->function.name);
+}
+
+static int acc_setup(void)
+{
+ struct acc_dev *dev;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ spin_lock_init(&dev->lock);
+ init_waitqueue_head(&dev->read_wq);
+ init_waitqueue_head(&dev->write_wq);
+ atomic_set(&dev->open_excl, 0);
+ INIT_LIST_HEAD(&dev->tx_idle);
+ INIT_LIST_HEAD(&dev->hid_list);
+ INIT_LIST_HEAD(&dev->new_hid_list);
+ INIT_LIST_HEAD(&dev->dead_hid_list);
+ INIT_DELAYED_WORK(&dev->start_work, acc_start_work);
+ INIT_WORK(&dev->hid_work, acc_hid_work);
+
+ /* _acc_dev must be set before calling usb_gadget_register_driver */
+ _acc_dev = dev;
+
+ ret = misc_register(&acc_device);
+ if (ret)
+ goto err;
+
+ return 0;
+
+err:
+ kfree(dev);
+ pr_err("USB accessory gadget driver failed to initialize\n");
+ return ret;
+}
+
+void acc_disconnect(void)
+{
+ /* unregister all HID devices if USB is disconnected */
+ kill_all_hid_devices(_acc_dev);
+}
+EXPORT_SYMBOL_GPL(acc_disconnect);
+
+static void acc_cleanup(void)
+{
+ misc_deregister(&acc_device);
+ kfree(_acc_dev);
+ _acc_dev = NULL;
+}
+static struct acc_instance *to_acc_instance(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct acc_instance,
+ func_inst.group);
+}
+
+static void acc_attr_release(struct config_item *item)
+{
+ struct acc_instance *fi_acc = to_acc_instance(item);
+
+ usb_put_function_instance(&fi_acc->func_inst);
+}
+
+static struct configfs_item_operations acc_item_ops = {
+ .release = acc_attr_release,
+};
+
+static struct config_item_type acc_func_type = {
+ .ct_item_ops = &acc_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct acc_instance *to_fi_acc(struct usb_function_instance *fi)
+{
+ return container_of(fi, struct acc_instance, func_inst);
+}
+
+static int acc_set_inst_name(struct usb_function_instance *fi, const char *name)
+{
+ struct acc_instance *fi_acc;
+ char *ptr;
+ int name_len;
+
+ name_len = strlen(name) + 1;
+ if (name_len > MAX_INST_NAME_LEN)
+ return -ENAMETOOLONG;
+
+ ptr = kstrndup(name, name_len, GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ fi_acc = to_fi_acc(fi);
+ fi_acc->name = ptr;
+ return 0;
+}
+
+static void acc_free_inst(struct usb_function_instance *fi)
+{
+ struct acc_instance *fi_acc;
+
+ fi_acc = to_fi_acc(fi);
+ kfree(fi_acc->name);
+ acc_cleanup();
+}
+
+static struct usb_function_instance *acc_alloc_inst(void)
+{
+ struct acc_instance *fi_acc;
+ struct acc_dev *dev;
+ int err;
+
+ fi_acc = kzalloc(sizeof(*fi_acc), GFP_KERNEL);
+ if (!fi_acc)
+ return ERR_PTR(-ENOMEM);
+ fi_acc->func_inst.set_inst_name = acc_set_inst_name;
+ fi_acc->func_inst.free_func_inst = acc_free_inst;
+
+ err = acc_setup();
+ if (err) {
+ kfree(fi_acc);
+ pr_err("Error setting ACCESSORY\n");
+ return ERR_PTR(err);
+ }
+
+ config_group_init_type_name(&fi_acc->func_inst.group,
+ "", &acc_func_type);
+ dev = _acc_dev;
+ return &fi_acc->func_inst;
+}
+
+static void acc_free(struct usb_function *f)
+{
+/*NO-OP: no function specific resource allocation in mtp_alloc*/
+}
+
+int acc_ctrlrequest_configfs(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl) {
+ if (f->config != NULL && f->config->cdev != NULL)
+ return acc_ctrlrequest(f->config->cdev, ctrl);
+ else
+ return -1;
+}
+
+static struct usb_function *acc_alloc(struct usb_function_instance *fi)
+{
+ struct acc_dev *dev = _acc_dev;
+
+ pr_info("acc_alloc\n");
+
+ dev->function.name = "accessory";
+ dev->function.strings = acc_strings,
+ dev->function.fs_descriptors = fs_acc_descs;
+ dev->function.hs_descriptors = hs_acc_descs;
+ dev->function.bind = acc_function_bind_configfs;
+ dev->function.unbind = acc_function_unbind;
+ dev->function.set_alt = acc_function_set_alt;
+ dev->function.disable = acc_function_disable;
+ dev->function.free_func = acc_free;
+ dev->function.setup = acc_ctrlrequest_configfs;
+
+ return &dev->function;
+}
+DECLARE_USB_FUNCTION_INIT(accessory, acc_alloc_inst, acc_alloc);
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/function/f_audio_source.c b/drivers/usb/gadget/function/f_audio_source.c
new file mode 100644
index 000000000000..db7903d19c43
--- /dev/null
+++ b/drivers/usb/gadget/function/f_audio_source.c
@@ -0,0 +1,1060 @@
+/*
+ * Gadget Function Driver for USB audio source device
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/usb/audio.h>
+#include <linux/wait.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+
+#include <linux/usb.h>
+#include <linux/usb_usual.h>
+#include <linux/usb/ch9.h>
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#define SAMPLE_RATE 44100
+#define FRAMES_PER_MSEC (SAMPLE_RATE / 1000)
+
+#define IN_EP_MAX_PACKET_SIZE 256
+
+/* Number of requests to allocate */
+#define IN_EP_REQ_COUNT 4
+
+#define AUDIO_AC_INTERFACE 0
+#define AUDIO_AS_INTERFACE 1
+#define AUDIO_NUM_INTERFACES 2
+#define MAX_INST_NAME_LEN 40
+
+/* B.3.1 Standard AC Interface Descriptor */
+static struct usb_interface_descriptor ac_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
+};
+
+DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
+
+#define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(AUDIO_NUM_INTERFACES)
+/* 1 input terminal, 1 output terminal and 1 feature unit */
+#define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
+ + UAC_DT_INPUT_TERMINAL_SIZE + UAC_DT_OUTPUT_TERMINAL_SIZE \
+ + UAC_DT_FEATURE_UNIT_SIZE(0))
+/* B.3.2 Class-Specific AC Interface Descriptor */
+static struct uac1_ac_header_descriptor_2 ac_header_desc = {
+ .bLength = UAC_DT_AC_HEADER_LENGTH,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_HEADER,
+ .bcdADC = __constant_cpu_to_le16(0x0100),
+ .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
+ .bInCollection = AUDIO_NUM_INTERFACES,
+ .baInterfaceNr = {
+ [0] = AUDIO_AC_INTERFACE,
+ [1] = AUDIO_AS_INTERFACE,
+ }
+};
+
+#define INPUT_TERMINAL_ID 1
+static struct uac_input_terminal_descriptor input_terminal_desc = {
+ .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_INPUT_TERMINAL,
+ .bTerminalID = INPUT_TERMINAL_ID,
+ .wTerminalType = UAC_INPUT_TERMINAL_MICROPHONE,
+ .bAssocTerminal = 0,
+ .wChannelConfig = 0x3,
+};
+
+DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
+
+#define FEATURE_UNIT_ID 2
+static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
+ .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FEATURE_UNIT,
+ .bUnitID = FEATURE_UNIT_ID,
+ .bSourceID = INPUT_TERMINAL_ID,
+ .bControlSize = 2,
+};
+
+#define OUTPUT_TERMINAL_ID 3
+static struct uac1_output_terminal_descriptor output_terminal_desc = {
+ .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
+ .bTerminalID = OUTPUT_TERMINAL_ID,
+ .wTerminalType = UAC_TERMINAL_STREAMING,
+ .bAssocTerminal = FEATURE_UNIT_ID,
+ .bSourceID = FEATURE_UNIT_ID,
+};
+
+/* B.4.1 Standard AS Interface Descriptor */
+static struct usb_interface_descriptor as_interface_alt_0_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+static struct usb_interface_descriptor as_interface_alt_1_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bAlternateSetting = 1,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_AUDIO,
+ .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
+};
+
+/* B.4.2 Class-Specific AS Interface Descriptor */
+static struct uac1_as_header_descriptor as_header_desc = {
+ .bLength = UAC_DT_AS_HEADER_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_AS_GENERAL,
+ .bTerminalLink = INPUT_TERMINAL_ID,
+ .bDelay = 1,
+ .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
+};
+
+DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
+
+static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
+ .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubtype = UAC_FORMAT_TYPE,
+ .bFormatType = UAC_FORMAT_TYPE_I,
+ .bSubframeSize = 2,
+ .bBitResolution = 16,
+ .bSamFreqType = 1,
+};
+
+/* Standard ISO IN Endpoint Descriptor for highspeed */
+static struct usb_endpoint_descriptor hs_as_in_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_SYNC_SYNC
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE),
+ .bInterval = 4, /* poll 1 per millisecond */
+};
+
+/* Standard ISO IN Endpoint Descriptor for highspeed */
+static struct usb_endpoint_descriptor fs_as_in_ep_desc = {
+ .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_SYNC_SYNC
+ | USB_ENDPOINT_XFER_ISOC,
+ .wMaxPacketSize = __constant_cpu_to_le16(IN_EP_MAX_PACKET_SIZE),
+ .bInterval = 1, /* poll 1 per millisecond */
+};
+
+/* Class-specific AS ISO OUT Endpoint Descriptor */
+static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
+ .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
+ .bDescriptorType = USB_DT_CS_ENDPOINT,
+ .bDescriptorSubtype = UAC_EP_GENERAL,
+ .bmAttributes = 1,
+ .bLockDelayUnits = 1,
+ .wLockDelay = __constant_cpu_to_le16(1),
+};
+
+static struct usb_descriptor_header *hs_audio_desc[] = {
+ (struct usb_descriptor_header *)&ac_interface_desc,
+ (struct usb_descriptor_header *)&ac_header_desc,
+
+ (struct usb_descriptor_header *)&input_terminal_desc,
+ (struct usb_descriptor_header *)&output_terminal_desc,
+ (struct usb_descriptor_header *)&feature_unit_desc,
+
+ (struct usb_descriptor_header *)&as_interface_alt_0_desc,
+ (struct usb_descriptor_header *)&as_interface_alt_1_desc,
+ (struct usb_descriptor_header *)&as_header_desc,
+
+ (struct usb_descriptor_header *)&as_type_i_desc,
+
+ (struct usb_descriptor_header *)&hs_as_in_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *fs_audio_desc[] = {
+ (struct usb_descriptor_header *)&ac_interface_desc,
+ (struct usb_descriptor_header *)&ac_header_desc,
+
+ (struct usb_descriptor_header *)&input_terminal_desc,
+ (struct usb_descriptor_header *)&output_terminal_desc,
+ (struct usb_descriptor_header *)&feature_unit_desc,
+
+ (struct usb_descriptor_header *)&as_interface_alt_0_desc,
+ (struct usb_descriptor_header *)&as_interface_alt_1_desc,
+ (struct usb_descriptor_header *)&as_header_desc,
+
+ (struct usb_descriptor_header *)&as_type_i_desc,
+
+ (struct usb_descriptor_header *)&fs_as_in_ep_desc,
+ (struct usb_descriptor_header *)&as_iso_in_desc,
+ NULL,
+};
+
+static struct snd_pcm_hardware audio_hw_info = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BATCH |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .channels_min = 2,
+ .channels_max = 2,
+ .rate_min = SAMPLE_RATE,
+ .rate_max = SAMPLE_RATE,
+
+ .buffer_bytes_max = 1024 * 1024,
+ .period_bytes_min = 64,
+ .period_bytes_max = 512 * 1024,
+ .periods_min = 2,
+ .periods_max = 1024,
+};
+
+/*-------------------------------------------------------------------------*/
+
+struct audio_source_config {
+ int card;
+ int device;
+};
+
+struct audio_dev {
+ struct usb_function func;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ struct snd_pcm_substream *substream;
+
+ struct list_head idle_reqs;
+ struct usb_ep *in_ep;
+
+ spinlock_t lock;
+
+ /* beginning, end and current position in our buffer */
+ void *buffer_start;
+ void *buffer_end;
+ void *buffer_pos;
+
+ /* byte size of a "period" */
+ unsigned int period;
+ /* bytes sent since last call to snd_pcm_period_elapsed */
+ unsigned int period_offset;
+ /* time we started playing */
+ ktime_t start_time;
+ /* number of frames sent since start_time */
+ s64 frames_sent;
+ struct audio_source_config *config;
+};
+
+static inline struct audio_dev *func_to_audio(struct usb_function *f)
+{
+ return container_of(f, struct audio_dev, func);
+}
+
+/*-------------------------------------------------------------------------*/
+
+struct audio_source_instance {
+ struct usb_function_instance func_inst;
+ const char *name;
+ struct audio_source_config *config;
+ struct device *audio_device;
+};
+
+static void audio_source_attr_release(struct config_item *item);
+
+static struct configfs_item_operations audio_source_item_ops = {
+ .release = audio_source_attr_release,
+};
+
+static struct config_item_type audio_source_func_type = {
+ .ct_item_ops = &audio_source_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static ssize_t audio_source_pcm_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+
+static DEVICE_ATTR(pcm, S_IRUGO, audio_source_pcm_show, NULL);
+
+static struct device_attribute *audio_source_function_attributes[] = {
+ &dev_attr_pcm,
+ NULL
+};
+
+/*--------------------------------------------------------------------------*/
+
+static struct usb_request *audio_request_new(struct usb_ep *ep, int buffer_size)
+{
+ struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+
+ if (!req)
+ return NULL;
+
+ req->buf = kmalloc(buffer_size, GFP_KERNEL);
+ if (!req->buf) {
+ usb_ep_free_request(ep, req);
+ return NULL;
+ }
+ req->length = buffer_size;
+ return req;
+}
+
+static void audio_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+ if (req) {
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+ }
+}
+
+static void audio_req_put(struct audio_dev *audio, struct usb_request *req)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ list_add_tail(&req->list, &audio->idle_reqs);
+ spin_unlock_irqrestore(&audio->lock, flags);
+}
+
+static struct usb_request *audio_req_get(struct audio_dev *audio)
+{
+ unsigned long flags;
+ struct usb_request *req;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ if (list_empty(&audio->idle_reqs)) {
+ req = 0;
+ } else {
+ req = list_first_entry(&audio->idle_reqs, struct usb_request,
+ list);
+ list_del(&req->list);
+ }
+ spin_unlock_irqrestore(&audio->lock, flags);
+ return req;
+}
+
+/* send the appropriate number of packets to match our bitrate */
+static void audio_send(struct audio_dev *audio)
+{
+ struct snd_pcm_runtime *runtime;
+ struct usb_request *req;
+ int length, length1, length2, ret;
+ s64 msecs;
+ s64 frames;
+ ktime_t now;
+
+ /* audio->substream will be null if we have been closed */
+ if (!audio->substream)
+ return;
+ /* audio->buffer_pos will be null if we have been stopped */
+ if (!audio->buffer_pos)
+ return;
+
+ runtime = audio->substream->runtime;
+
+ /* compute number of frames to send */
+ now = ktime_get();
+ msecs = div_s64((ktime_to_ns(now) - ktime_to_ns(audio->start_time)),
+ 1000000);
+ frames = div_s64((msecs * SAMPLE_RATE), 1000);
+
+ /* Readjust our frames_sent if we fall too far behind.
+ * If we get too far behind it is better to drop some frames than
+ * to keep sending data too fast in an attempt to catch up.
+ */
+ if (frames - audio->frames_sent > 10 * FRAMES_PER_MSEC)
+ audio->frames_sent = frames - FRAMES_PER_MSEC;
+
+ frames -= audio->frames_sent;
+
+ /* We need to send something to keep the pipeline going */
+ if (frames <= 0)
+ frames = FRAMES_PER_MSEC;
+
+ while (frames > 0) {
+ req = audio_req_get(audio);
+ if (!req)
+ break;
+
+ length = frames_to_bytes(runtime, frames);
+ if (length > IN_EP_MAX_PACKET_SIZE)
+ length = IN_EP_MAX_PACKET_SIZE;
+
+ if (audio->buffer_pos + length > audio->buffer_end)
+ length1 = audio->buffer_end - audio->buffer_pos;
+ else
+ length1 = length;
+ memcpy(req->buf, audio->buffer_pos, length1);
+ if (length1 < length) {
+ /* Wrap around and copy remaining length
+ * at beginning of buffer.
+ */
+ length2 = length - length1;
+ memcpy(req->buf + length1, audio->buffer_start,
+ length2);
+ audio->buffer_pos = audio->buffer_start + length2;
+ } else {
+ audio->buffer_pos += length1;
+ if (audio->buffer_pos >= audio->buffer_end)
+ audio->buffer_pos = audio->buffer_start;
+ }
+
+ req->length = length;
+ ret = usb_ep_queue(audio->in_ep, req, GFP_ATOMIC);
+ if (ret < 0) {
+ pr_err("usb_ep_queue failed ret: %d\n", ret);
+ audio_req_put(audio, req);
+ break;
+ }
+
+ frames -= bytes_to_frames(runtime, length);
+ audio->frames_sent += bytes_to_frames(runtime, length);
+ }
+}
+
+static void audio_control_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ /* nothing to do here */
+}
+
+static void audio_data_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct audio_dev *audio = req->context;
+
+ pr_debug("audio_data_complete req->status %d req->actual %d\n",
+ req->status, req->actual);
+
+ audio_req_put(audio, req);
+
+ if (!audio->buffer_start || req->status)
+ return;
+
+ audio->period_offset += req->actual;
+ if (audio->period_offset >= audio->period) {
+ snd_pcm_period_elapsed(audio->substream);
+ audio->period_offset = 0;
+ }
+ audio_send(audio);
+}
+
+static int audio_set_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ int value = -EOPNOTSUPP;
+ u16 ep = le16_to_cpu(ctrl->wIndex);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+
+ pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ switch (ctrl->bRequest) {
+ case UAC_SET_CUR:
+ case UAC_SET_MIN:
+ case UAC_SET_MAX:
+ case UAC_SET_RES:
+ value = len;
+ break;
+ default:
+ break;
+ }
+
+ return value;
+}
+
+static int audio_get_endpoint_req(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int value = -EOPNOTSUPP;
+ u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u8 *buf = cdev->req->buf;
+
+ pr_debug("bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
+ ctrl->bRequest, w_value, len, ep);
+
+ if (w_value == UAC_EP_CS_ATTR_SAMPLE_RATE << 8) {
+ switch (ctrl->bRequest) {
+ case UAC_GET_CUR:
+ case UAC_GET_MIN:
+ case UAC_GET_MAX:
+ case UAC_GET_RES:
+ /* return our sample rate */
+ buf[0] = (u8)SAMPLE_RATE;
+ buf[1] = (u8)(SAMPLE_RATE >> 8);
+ buf[2] = (u8)(SAMPLE_RATE >> 16);
+ value = 3;
+ break;
+ default:
+ break;
+ }
+ }
+
+ return value;
+}
+
+static int
+audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_composite_dev *cdev = f->config->cdev;
+ struct usb_request *req = cdev->req;
+ int value = -EOPNOTSUPP;
+ u16 w_index = le16_to_cpu(ctrl->wIndex);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+
+ /* composite driver infrastructure handles everything; interface
+ * activation uses set_alt().
+ */
+ switch (ctrl->bRequestType) {
+ case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
+ value = audio_set_endpoint_req(f, ctrl);
+ break;
+
+ case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
+ value = audio_get_endpoint_req(f, ctrl);
+ break;
+ }
+
+ /* respond with data transfer or status phase? */
+ if (value >= 0) {
+ pr_debug("audio req%02x.%02x v%04x i%04x l%d\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+ req->zero = 0;
+ req->length = value;
+ req->complete = audio_control_complete;
+ value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
+ if (value < 0)
+ pr_err("audio response on err %d\n", value);
+ }
+
+ /* device either stalls (value < 0) or reports success */
+ return value;
+}
+
+static int audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct audio_dev *audio = func_to_audio(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int ret;
+
+ pr_debug("audio_set_alt intf %d, alt %d\n", intf, alt);
+
+ ret = config_ep_by_speed(cdev->gadget, f, audio->in_ep);
+ if (ret)
+ return ret;
+
+ usb_ep_enable(audio->in_ep);
+ return 0;
+}
+
+static void audio_disable(struct usb_function *f)
+{
+ struct audio_dev *audio = func_to_audio(f);
+
+ pr_debug("audio_disable\n");
+ usb_ep_disable(audio->in_ep);
+}
+
+static void audio_free_func(struct usb_function *f)
+{
+ /* no-op */
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void audio_build_desc(struct audio_dev *audio)
+{
+ u8 *sam_freq;
+ int rate;
+
+ /* Set channel numbers */
+ input_terminal_desc.bNrChannels = 2;
+ as_type_i_desc.bNrChannels = 2;
+
+ /* Set sample rates */
+ rate = SAMPLE_RATE;
+ sam_freq = as_type_i_desc.tSamFreq[0];
+ memcpy(sam_freq, &rate, 3);
+}
+
+
+static int snd_card_setup(struct usb_configuration *c,
+ struct audio_source_config *config);
+static struct audio_source_instance *to_fi_audio_source(
+ const struct usb_function_instance *fi);
+
+
+/* audio function driver setup/binding */
+static int
+audio_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct audio_dev *audio = func_to_audio(f);
+ int status;
+ struct usb_ep *ep;
+ struct usb_request *req;
+ int i;
+ int err;
+
+ if (IS_ENABLED(CONFIG_USB_CONFIGFS)) {
+ struct audio_source_instance *fi_audio =
+ to_fi_audio_source(f->fi);
+ struct audio_source_config *config =
+ fi_audio->config;
+
+ err = snd_card_setup(c, config);
+ if (err)
+ return err;
+ }
+
+ audio_build_desc(audio);
+
+ /* allocate instance-specific interface IDs, and patch descriptors */
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ ac_interface_desc.bInterfaceNumber = status;
+
+ /* AUDIO_AC_INTERFACE */
+ ac_header_desc.baInterfaceNr[0] = status;
+
+ status = usb_interface_id(c, f);
+ if (status < 0)
+ goto fail;
+ as_interface_alt_0_desc.bInterfaceNumber = status;
+ as_interface_alt_1_desc.bInterfaceNumber = status;
+
+ /* AUDIO_AS_INTERFACE */
+ ac_header_desc.baInterfaceNr[1] = status;
+
+ status = -ENODEV;
+
+ /* allocate our endpoint */
+ ep = usb_ep_autoconfig(cdev->gadget, &fs_as_in_ep_desc);
+ if (!ep)
+ goto fail;
+ audio->in_ep = ep;
+ ep->driver_data = audio; /* claim */
+
+ if (gadget_is_dualspeed(c->cdev->gadget))
+ hs_as_in_ep_desc.bEndpointAddress =
+ fs_as_in_ep_desc.bEndpointAddress;
+
+ f->fs_descriptors = fs_audio_desc;
+ f->hs_descriptors = hs_audio_desc;
+
+ for (i = 0, status = 0; i < IN_EP_REQ_COUNT && status == 0; i++) {
+ req = audio_request_new(ep, IN_EP_MAX_PACKET_SIZE);
+ if (req) {
+ req->context = audio;
+ req->complete = audio_data_complete;
+ audio_req_put(audio, req);
+ } else
+ status = -ENOMEM;
+ }
+
+fail:
+ return status;
+}
+
+static void
+audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct audio_dev *audio = func_to_audio(f);
+ struct usb_request *req;
+
+ while ((req = audio_req_get(audio)))
+ audio_request_free(req, audio->in_ep);
+
+ snd_card_free_when_closed(audio->card);
+ audio->card = NULL;
+ audio->pcm = NULL;
+ audio->substream = NULL;
+ audio->in_ep = NULL;
+
+ if (IS_ENABLED(CONFIG_USB_CONFIGFS)) {
+ struct audio_source_instance *fi_audio =
+ to_fi_audio_source(f->fi);
+ struct audio_source_config *config =
+ fi_audio->config;
+
+ config->card = -1;
+ config->device = -1;
+ }
+}
+
+static void audio_pcm_playback_start(struct audio_dev *audio)
+{
+ audio->start_time = ktime_get();
+ audio->frames_sent = 0;
+ audio_send(audio);
+}
+
+static void audio_pcm_playback_stop(struct audio_dev *audio)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ audio->buffer_start = 0;
+ audio->buffer_end = 0;
+ audio->buffer_pos = 0;
+ spin_unlock_irqrestore(&audio->lock, flags);
+}
+
+static int audio_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct audio_dev *audio = substream->private_data;
+
+ runtime->private_data = audio;
+ runtime->hw = audio_hw_info;
+ snd_pcm_limit_hw_rates(runtime);
+ runtime->hw.channels_max = 2;
+
+ audio->substream = substream;
+ return 0;
+}
+
+static int audio_pcm_close(struct snd_pcm_substream *substream)
+{
+ struct audio_dev *audio = substream->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&audio->lock, flags);
+ audio->substream = NULL;
+ spin_unlock_irqrestore(&audio->lock, flags);
+
+ return 0;
+}
+
+static int audio_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ unsigned int channels = params_channels(params);
+ unsigned int rate = params_rate(params);
+
+ if (rate != SAMPLE_RATE)
+ return -EINVAL;
+ if (channels != 2)
+ return -EINVAL;
+
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(params));
+}
+
+static int audio_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int audio_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct audio_dev *audio = runtime->private_data;
+
+ audio->period = snd_pcm_lib_period_bytes(substream);
+ audio->period_offset = 0;
+ audio->buffer_start = runtime->dma_area;
+ audio->buffer_end = audio->buffer_start
+ + snd_pcm_lib_buffer_bytes(substream);
+ audio->buffer_pos = audio->buffer_start;
+
+ return 0;
+}
+
+static snd_pcm_uframes_t audio_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct audio_dev *audio = runtime->private_data;
+ ssize_t bytes = audio->buffer_pos - audio->buffer_start;
+
+ /* return offset of next frame to fill in our buffer */
+ return bytes_to_frames(runtime, bytes);
+}
+
+static int audio_pcm_playback_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ struct audio_dev *audio = substream->runtime->private_data;
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ audio_pcm_playback_start(audio);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ audio_pcm_playback_stop(audio);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static struct audio_dev _audio_dev = {
+ .func = {
+ .name = "audio_source",
+ .bind = audio_bind,
+ .unbind = audio_unbind,
+ .set_alt = audio_set_alt,
+ .setup = audio_setup,
+ .disable = audio_disable,
+ .free_func = audio_free_func,
+ },
+ .lock = __SPIN_LOCK_UNLOCKED(_audio_dev.lock),
+ .idle_reqs = LIST_HEAD_INIT(_audio_dev.idle_reqs),
+};
+
+static struct snd_pcm_ops audio_playback_ops = {
+ .open = audio_pcm_open,
+ .close = audio_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = audio_pcm_hw_params,
+ .hw_free = audio_pcm_hw_free,
+ .prepare = audio_pcm_prepare,
+ .trigger = audio_pcm_playback_trigger,
+ .pointer = audio_pcm_pointer,
+};
+
+int audio_source_bind_config(struct usb_configuration *c,
+ struct audio_source_config *config)
+{
+ struct audio_dev *audio;
+ int err;
+
+ config->card = -1;
+ config->device = -1;
+
+ audio = &_audio_dev;
+
+ err = snd_card_setup(c, config);
+ if (err)
+ return err;
+
+ err = usb_add_function(c, &audio->func);
+ if (err)
+ goto add_fail;
+
+ return 0;
+
+add_fail:
+ snd_card_free(audio->card);
+ return err;
+}
+
+static int snd_card_setup(struct usb_configuration *c,
+ struct audio_source_config *config)
+{
+ struct audio_dev *audio;
+ struct snd_card *card;
+ struct snd_pcm *pcm;
+ int err;
+
+ audio = &_audio_dev;
+
+ err = snd_card_new(&c->cdev->gadget->dev,
+ SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, 0, &card);
+ if (err)
+ return err;
+
+ err = snd_pcm_new(card, "USB audio source", 0, 1, 0, &pcm);
+ if (err)
+ goto pcm_fail;
+
+ pcm->private_data = audio;
+ pcm->info_flags = 0;
+ audio->pcm = pcm;
+
+ strlcpy(pcm->name, "USB gadget audio", sizeof(pcm->name));
+
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &audio_playback_ops);
+ snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+ NULL, 0, 64 * 1024);
+
+ strlcpy(card->driver, "audio_source", sizeof(card->driver));
+ strlcpy(card->shortname, card->driver, sizeof(card->shortname));
+ strlcpy(card->longname, "USB accessory audio source",
+ sizeof(card->longname));
+
+ err = snd_card_register(card);
+ if (err)
+ goto register_fail;
+
+ config->card = pcm->card->number;
+ config->device = pcm->device;
+ audio->card = card;
+ return 0;
+
+register_fail:
+pcm_fail:
+ snd_card_free(audio->card);
+ return err;
+}
+
+static struct audio_source_instance *to_audio_source_instance(
+ struct config_item *item)
+{
+ return container_of(to_config_group(item), struct audio_source_instance,
+ func_inst.group);
+}
+
+static struct audio_source_instance *to_fi_audio_source(
+ const struct usb_function_instance *fi)
+{
+ return container_of(fi, struct audio_source_instance, func_inst);
+}
+
+static void audio_source_attr_release(struct config_item *item)
+{
+ struct audio_source_instance *fi_audio = to_audio_source_instance(item);
+
+ usb_put_function_instance(&fi_audio->func_inst);
+}
+
+static int audio_source_set_inst_name(struct usb_function_instance *fi,
+ const char *name)
+{
+ struct audio_source_instance *fi_audio;
+ char *ptr;
+ int name_len;
+
+ name_len = strlen(name) + 1;
+ if (name_len > MAX_INST_NAME_LEN)
+ return -ENAMETOOLONG;
+
+ ptr = kstrndup(name, name_len, GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ fi_audio = to_fi_audio_source(fi);
+ fi_audio->name = ptr;
+
+ return 0;
+}
+
+static void audio_source_free_inst(struct usb_function_instance *fi)
+{
+ struct audio_source_instance *fi_audio;
+
+ fi_audio = to_fi_audio_source(fi);
+ device_destroy(fi_audio->audio_device->class,
+ fi_audio->audio_device->devt);
+ kfree(fi_audio->name);
+ kfree(fi_audio->config);
+}
+
+static ssize_t audio_source_pcm_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct audio_source_instance *fi_audio = dev_get_drvdata(dev);
+ struct audio_source_config *config = fi_audio->config;
+
+ /* print PCM card and device numbers */
+ return sprintf(buf, "%d %d\n", config->card, config->device);
+}
+
+struct device *create_function_device(char *name);
+
+static struct usb_function_instance *audio_source_alloc_inst(void)
+{
+ struct audio_source_instance *fi_audio;
+ struct device_attribute **attrs;
+ struct device_attribute *attr;
+ struct device *dev;
+ void *err_ptr;
+ int err = 0;
+
+ fi_audio = kzalloc(sizeof(*fi_audio), GFP_KERNEL);
+ if (!fi_audio)
+ return ERR_PTR(-ENOMEM);
+
+ fi_audio->func_inst.set_inst_name = audio_source_set_inst_name;
+ fi_audio->func_inst.free_func_inst = audio_source_free_inst;
+
+ fi_audio->config = kzalloc(sizeof(struct audio_source_config),
+ GFP_KERNEL);
+ if (!fi_audio->config) {
+ err_ptr = ERR_PTR(-ENOMEM);
+ goto fail_audio;
+ }
+
+ config_group_init_type_name(&fi_audio->func_inst.group, "",
+ &audio_source_func_type);
+ dev = create_function_device("f_audio_source");
+
+ if (IS_ERR(dev)) {
+ err_ptr = dev;
+ goto fail_audio_config;
+ }
+
+ fi_audio->config->card = -1;
+ fi_audio->config->device = -1;
+ fi_audio->audio_device = dev;
+
+ attrs = audio_source_function_attributes;
+ if (attrs) {
+ while ((attr = *attrs++) && !err)
+ err = device_create_file(dev, attr);
+ if (err) {
+ err_ptr = ERR_PTR(-EINVAL);
+ goto fail_device;
+ }
+ }
+
+ dev_set_drvdata(dev, fi_audio);
+ _audio_dev.config = fi_audio->config;
+
+ return &fi_audio->func_inst;
+
+fail_device:
+ device_destroy(dev->class, dev->devt);
+fail_audio_config:
+ kfree(fi_audio->config);
+fail_audio:
+ kfree(fi_audio);
+ return err_ptr;
+
+}
+
+static struct usb_function *audio_source_alloc(struct usb_function_instance *fi)
+{
+ return &_audio_dev.func;
+}
+
+DECLARE_USB_FUNCTION_INIT(audio_source, audio_source_alloc_inst,
+ audio_source_alloc);
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index 898a570319f1..847f70363477 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -1040,6 +1040,65 @@ static void f_midi_free_inst(struct usb_function_instance *f)
kfree(opts);
}
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
+extern struct device *create_function_device(char *name);
+static ssize_t alsa_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_function_instance *fi_midi = dev_get_drvdata(dev);
+ struct f_midi *midi;
+
+ if (!fi_midi->f)
+ dev_warn(dev, "f_midi: function not set\n");
+
+ if (fi_midi && fi_midi->f) {
+ midi = func_to_midi(fi_midi->f);
+ if (midi->rmidi && midi->rmidi->card)
+ return sprintf(buf, "%d %d\n",
+ midi->rmidi->card->number, midi->rmidi->device);
+ }
+
+ /* print PCM card and device numbers */
+ return sprintf(buf, "%d %d\n", -1, -1);
+}
+
+static DEVICE_ATTR(alsa, S_IRUGO, alsa_show, NULL);
+
+static struct device_attribute *alsa_function_attributes[] = {
+ &dev_attr_alsa,
+ NULL
+};
+
+static int create_alsa_device(struct usb_function_instance *fi)
+{
+ struct device *dev;
+ struct device_attribute **attrs;
+ struct device_attribute *attr;
+ int err = 0;
+
+ dev = create_function_device("f_midi");
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ attrs = alsa_function_attributes;
+ if (attrs) {
+ while ((attr = *attrs++) && !err)
+ err = device_create_file(dev, attr);
+ if (err) {
+ device_destroy(dev->class, dev->devt);
+ return -EINVAL;
+ }
+ }
+ dev_set_drvdata(dev, fi);
+ return 0;
+}
+#else
+static int create_alsa_device(struct usb_function_instance *fi)
+{
+ return 0;
+}
+#endif
+
static struct usb_function_instance *f_midi_alloc_inst(void)
{
struct f_midi_opts *opts;
@@ -1057,6 +1116,11 @@ static struct usb_function_instance *f_midi_alloc_inst(void)
opts->in_ports = 1;
opts->out_ports = 1;
+ if (create_alsa_device(&opts->func_inst)) {
+ kfree(opts);
+ return ERR_PTR(-ENODEV);
+ }
+
config_group_init_type_name(&opts->func_inst.group, "",
&midi_func_type);
@@ -1076,6 +1140,7 @@ static void f_midi_free(struct usb_function *f)
for (i = opts->in_ports - 1; i >= 0; --i)
kfree(midi->in_port[i]);
kfree(midi);
+ opts->func_inst.f = NULL;
--opts->refcnt;
mutex_unlock(&opts->lock);
}
@@ -1158,6 +1223,7 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
midi->func.disable = f_midi_disable;
midi->func.free_func = f_midi_free;
+ fi->f = &midi->func;
return &midi->func;
setup_fail:
diff --git a/drivers/usb/gadget/function/f_mtp.c b/drivers/usb/gadget/function/f_mtp.c
new file mode 100644
index 000000000000..d8b69af6e335
--- /dev/null
+++ b/drivers/usb/gadget/function/f_mtp.c
@@ -0,0 +1,1537 @@
+/*
+ * Gadget Function Driver for MTP
+ *
+ * Copyright (C) 2010 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* #define DEBUG */
+/* #define VERBOSE_DEBUG */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+
+#include <linux/types.h>
+#include <linux/file.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+
+#include <linux/usb.h>
+#include <linux/usb_usual.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/f_mtp.h>
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+
+#include "configfs.h"
+
+#define MTP_BULK_BUFFER_SIZE 16384
+#define INTR_BUFFER_SIZE 28
+#define MAX_INST_NAME_LEN 40
+
+/* String IDs */
+#define INTERFACE_STRING_INDEX 0
+
+/* values for mtp_dev.state */
+#define STATE_OFFLINE 0 /* initial state, disconnected */
+#define STATE_READY 1 /* ready for userspace calls */
+#define STATE_BUSY 2 /* processing userspace calls */
+#define STATE_CANCELED 3 /* transaction canceled by host */
+#define STATE_ERROR 4 /* error from completion routine */
+
+/* number of tx and rx requests to allocate */
+#define TX_REQ_MAX 4
+#define RX_REQ_MAX 2
+#define INTR_REQ_MAX 5
+
+/* ID for Microsoft MTP OS String */
+#define MTP_OS_STRING_ID 0xEE
+
+/* MTP class reqeusts */
+#define MTP_REQ_CANCEL 0x64
+#define MTP_REQ_GET_EXT_EVENT_DATA 0x65
+#define MTP_REQ_RESET 0x66
+#define MTP_REQ_GET_DEVICE_STATUS 0x67
+
+/* constants for device status */
+#define MTP_RESPONSE_OK 0x2001
+#define MTP_RESPONSE_DEVICE_BUSY 0x2019
+#define DRIVER_NAME "mtp"
+
+static const char mtp_shortname[] = DRIVER_NAME "_usb";
+
+struct mtp_dev {
+ struct usb_function function;
+ struct usb_composite_dev *cdev;
+ spinlock_t lock;
+
+ struct usb_ep *ep_in;
+ struct usb_ep *ep_out;
+ struct usb_ep *ep_intr;
+
+ int state;
+
+ /* synchronize access to our device file */
+ atomic_t open_excl;
+ /* to enforce only one ioctl at a time */
+ atomic_t ioctl_excl;
+
+ struct list_head tx_idle;
+ struct list_head intr_idle;
+
+ wait_queue_head_t read_wq;
+ wait_queue_head_t write_wq;
+ wait_queue_head_t intr_wq;
+ struct usb_request *rx_req[RX_REQ_MAX];
+ int rx_done;
+
+ /* for processing MTP_SEND_FILE, MTP_RECEIVE_FILE and
+ * MTP_SEND_FILE_WITH_HEADER ioctls on a work queue
+ */
+ struct workqueue_struct *wq;
+ struct work_struct send_file_work;
+ struct work_struct receive_file_work;
+ struct file *xfer_file;
+ loff_t xfer_file_offset;
+ int64_t xfer_file_length;
+ unsigned xfer_send_header;
+ uint16_t xfer_command;
+ uint32_t xfer_transaction_id;
+ int xfer_result;
+};
+
+static struct usb_interface_descriptor mtp_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bNumEndpoints = 3,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
+ .bInterfaceProtocol = 0,
+};
+
+static struct usb_interface_descriptor ptp_interface_desc = {
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bNumEndpoints = 3,
+ .bInterfaceClass = USB_CLASS_STILL_IMAGE,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 1,
+};
+
+static struct usb_endpoint_descriptor mtp_ss_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor mtp_ss_in_comp_desc = {
+ .bLength = sizeof(mtp_ss_in_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ /* .bMaxBurst = DYNAMIC, */
+};
+
+static struct usb_endpoint_descriptor mtp_ss_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(1024),
+};
+
+static struct usb_ss_ep_comp_descriptor mtp_ss_out_comp_desc = {
+ .bLength = sizeof(mtp_ss_out_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ /* .bMaxBurst = DYNAMIC, */
+};
+
+static struct usb_endpoint_descriptor mtp_highspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor mtp_highspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor mtp_fullspeed_in_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor mtp_fullspeed_out_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor mtp_intr_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = __constant_cpu_to_le16(INTR_BUFFER_SIZE),
+ .bInterval = 6,
+};
+
+static struct usb_ss_ep_comp_descriptor mtp_intr_ss_comp_desc = {
+ .bLength = sizeof(mtp_intr_ss_comp_desc),
+ .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+ .wBytesPerInterval = cpu_to_le16(INTR_BUFFER_SIZE),
+};
+
+static struct usb_descriptor_header *fs_mtp_descs[] = {
+ (struct usb_descriptor_header *) &mtp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_mtp_descs[] = {
+ (struct usb_descriptor_header *) &mtp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *ss_mtp_descs[] = {
+ (struct usb_descriptor_header *) &mtp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_ss_in_desc,
+ (struct usb_descriptor_header *) &mtp_ss_in_comp_desc,
+ (struct usb_descriptor_header *) &mtp_ss_out_desc,
+ (struct usb_descriptor_header *) &mtp_ss_out_comp_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ (struct usb_descriptor_header *) &mtp_intr_ss_comp_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *fs_ptp_descs[] = {
+ (struct usb_descriptor_header *) &ptp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_fullspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *hs_ptp_descs[] = {
+ (struct usb_descriptor_header *) &ptp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_in_desc,
+ (struct usb_descriptor_header *) &mtp_highspeed_out_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ NULL,
+};
+
+static struct usb_descriptor_header *ss_ptp_descs[] = {
+ (struct usb_descriptor_header *) &ptp_interface_desc,
+ (struct usb_descriptor_header *) &mtp_ss_in_desc,
+ (struct usb_descriptor_header *) &mtp_ss_in_comp_desc,
+ (struct usb_descriptor_header *) &mtp_ss_out_desc,
+ (struct usb_descriptor_header *) &mtp_ss_out_comp_desc,
+ (struct usb_descriptor_header *) &mtp_intr_desc,
+ (struct usb_descriptor_header *) &mtp_intr_ss_comp_desc,
+ NULL,
+};
+
+static struct usb_string mtp_string_defs[] = {
+ /* Naming interface "MTP" so libmtp will recognize us */
+ [INTERFACE_STRING_INDEX].s = "MTP",
+ { }, /* end of list */
+};
+
+static struct usb_gadget_strings mtp_string_table = {
+ .language = 0x0409, /* en-US */
+ .strings = mtp_string_defs,
+};
+
+static struct usb_gadget_strings *mtp_strings[] = {
+ &mtp_string_table,
+ NULL,
+};
+
+/* Microsoft MTP OS String */
+static u8 mtp_os_string[] = {
+ 18, /* sizeof(mtp_os_string) */
+ USB_DT_STRING,
+ /* Signature field: "MSFT100" */
+ 'M', 0, 'S', 0, 'F', 0, 'T', 0, '1', 0, '0', 0, '0', 0,
+ /* vendor code */
+ 1,
+ /* padding */
+ 0
+};
+
+/* Microsoft Extended Configuration Descriptor Header Section */
+struct mtp_ext_config_desc_header {
+ __le32 dwLength;
+ __u16 bcdVersion;
+ __le16 wIndex;
+ __u8 bCount;
+ __u8 reserved[7];
+};
+
+/* Microsoft Extended Configuration Descriptor Function Section */
+struct mtp_ext_config_desc_function {
+ __u8 bFirstInterfaceNumber;
+ __u8 bInterfaceCount;
+ __u8 compatibleID[8];
+ __u8 subCompatibleID[8];
+ __u8 reserved[6];
+};
+
+/* MTP Extended Configuration Descriptor */
+struct {
+ struct mtp_ext_config_desc_header header;
+ struct mtp_ext_config_desc_function function;
+} mtp_ext_config_desc = {
+ .header = {
+ .dwLength = __constant_cpu_to_le32(sizeof(mtp_ext_config_desc)),
+ .bcdVersion = __constant_cpu_to_le16(0x0100),
+ .wIndex = __constant_cpu_to_le16(4),
+ .bCount = 1,
+ },
+ .function = {
+ .bFirstInterfaceNumber = 0,
+ .bInterfaceCount = 1,
+ .compatibleID = { 'M', 'T', 'P' },
+ },
+};
+
+struct mtp_device_status {
+ __le16 wLength;
+ __le16 wCode;
+};
+
+struct mtp_data_header {
+ /* length of packet, including this header */
+ __le32 length;
+ /* container type (2 for data packet) */
+ __le16 type;
+ /* MTP command code */
+ __le16 command;
+ /* MTP transaction ID */
+ __le32 transaction_id;
+};
+
+struct mtp_instance {
+ struct usb_function_instance func_inst;
+ const char *name;
+ struct mtp_dev *dev;
+ char mtp_ext_compat_id[16];
+ struct usb_os_desc mtp_os_desc;
+};
+
+/* temporary variable used between mtp_open() and mtp_gadget_bind() */
+static struct mtp_dev *_mtp_dev;
+
+static inline struct mtp_dev *func_to_mtp(struct usb_function *f)
+{
+ return container_of(f, struct mtp_dev, function);
+}
+
+static struct usb_request *mtp_request_new(struct usb_ep *ep, int buffer_size)
+{
+ struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+
+ if (!req)
+ return NULL;
+
+ /* now allocate buffers for the requests */
+ req->buf = kmalloc(buffer_size, GFP_KERNEL);
+ if (!req->buf) {
+ usb_ep_free_request(ep, req);
+ return NULL;
+ }
+
+ return req;
+}
+
+static void mtp_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+ if (req) {
+ kfree(req->buf);
+ usb_ep_free_request(ep, req);
+ }
+}
+
+static inline int mtp_lock(atomic_t *excl)
+{
+ if (atomic_inc_return(excl) == 1) {
+ return 0;
+ } else {
+ atomic_dec(excl);
+ return -1;
+ }
+}
+
+static inline void mtp_unlock(atomic_t *excl)
+{
+ atomic_dec(excl);
+}
+
+/* add a request to the tail of a list */
+static void mtp_req_put(struct mtp_dev *dev, struct list_head *head,
+ struct usb_request *req)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ list_add_tail(&req->list, head);
+ spin_unlock_irqrestore(&dev->lock, flags);
+}
+
+/* remove a request from the head of a list */
+static struct usb_request
+*mtp_req_get(struct mtp_dev *dev, struct list_head *head)
+{
+ unsigned long flags;
+ struct usb_request *req;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ if (list_empty(head)) {
+ req = 0;
+ } else {
+ req = list_first_entry(head, struct usb_request, list);
+ list_del(&req->list);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return req;
+}
+
+static void mtp_complete_in(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ if (req->status != 0)
+ dev->state = STATE_ERROR;
+
+ mtp_req_put(dev, &dev->tx_idle, req);
+
+ wake_up(&dev->write_wq);
+}
+
+static void mtp_complete_out(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ dev->rx_done = 1;
+ if (req->status != 0)
+ dev->state = STATE_ERROR;
+
+ wake_up(&dev->read_wq);
+}
+
+static void mtp_complete_intr(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ if (req->status != 0)
+ dev->state = STATE_ERROR;
+
+ mtp_req_put(dev, &dev->intr_idle, req);
+
+ wake_up(&dev->intr_wq);
+}
+
+static int mtp_create_bulk_endpoints(struct mtp_dev *dev,
+ struct usb_endpoint_descriptor *in_desc,
+ struct usb_endpoint_descriptor *out_desc,
+ struct usb_endpoint_descriptor *intr_desc)
+{
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req;
+ struct usb_ep *ep;
+ int i;
+
+ DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
+
+ ep = usb_ep_autoconfig(cdev->gadget, in_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_in = ep;
+
+ ep = usb_ep_autoconfig(cdev->gadget, out_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for mtp ep_out got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_out = ep;
+
+ ep = usb_ep_autoconfig(cdev->gadget, intr_desc);
+ if (!ep) {
+ DBG(cdev, "usb_ep_autoconfig for ep_intr failed\n");
+ return -ENODEV;
+ }
+ DBG(cdev, "usb_ep_autoconfig for mtp ep_intr got %s\n", ep->name);
+ ep->driver_data = dev; /* claim the endpoint */
+ dev->ep_intr = ep;
+
+ /* now allocate requests for our endpoints */
+ for (i = 0; i < TX_REQ_MAX; i++) {
+ req = mtp_request_new(dev->ep_in, MTP_BULK_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = mtp_complete_in;
+ mtp_req_put(dev, &dev->tx_idle, req);
+ }
+ for (i = 0; i < RX_REQ_MAX; i++) {
+ req = mtp_request_new(dev->ep_out, MTP_BULK_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = mtp_complete_out;
+ dev->rx_req[i] = req;
+ }
+ for (i = 0; i < INTR_REQ_MAX; i++) {
+ req = mtp_request_new(dev->ep_intr, INTR_BUFFER_SIZE);
+ if (!req)
+ goto fail;
+ req->complete = mtp_complete_intr;
+ mtp_req_put(dev, &dev->intr_idle, req);
+ }
+
+ return 0;
+
+fail:
+ pr_err("mtp_bind() could not allocate requests\n");
+ return -1;
+}
+
+static ssize_t mtp_read(struct file *fp, char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct mtp_dev *dev = fp->private_data;
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req;
+ ssize_t r = count;
+ unsigned xfer;
+ int ret = 0;
+
+ DBG(cdev, "mtp_read(%zu)\n", count);
+
+ if (count > MTP_BULK_BUFFER_SIZE)
+ return -EINVAL;
+
+ /* we will block until we're online */
+ DBG(cdev, "mtp_read: waiting for online state\n");
+ ret = wait_event_interruptible(dev->read_wq,
+ dev->state != STATE_OFFLINE);
+ if (ret < 0) {
+ r = ret;
+ goto done;
+ }
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED) {
+ /* report cancelation to userspace */
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+ return -ECANCELED;
+ }
+ dev->state = STATE_BUSY;
+ spin_unlock_irq(&dev->lock);
+
+requeue_req:
+ /* queue a request */
+ req = dev->rx_req[0];
+ req->length = count;
+ dev->rx_done = 0;
+ ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
+ if (ret < 0) {
+ r = -EIO;
+ goto done;
+ } else {
+ DBG(cdev, "rx %p queue\n", req);
+ }
+
+ /* wait for a request to complete */
+ ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
+ if (ret < 0) {
+ r = ret;
+ usb_ep_dequeue(dev->ep_out, req);
+ goto done;
+ }
+ if (dev->state == STATE_BUSY) {
+ /* If we got a 0-len packet, throw it back and try again. */
+ if (req->actual == 0)
+ goto requeue_req;
+
+ DBG(cdev, "rx %p %d\n", req, req->actual);
+ xfer = (req->actual < count) ? req->actual : count;
+ r = xfer;
+ if (copy_to_user(buf, req->buf, xfer))
+ r = -EFAULT;
+ } else
+ r = -EIO;
+
+done:
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED)
+ r = -ECANCELED;
+ else if (dev->state != STATE_OFFLINE)
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+
+ DBG(cdev, "mtp_read returning %zd\n", r);
+ return r;
+}
+
+static ssize_t mtp_write(struct file *fp, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct mtp_dev *dev = fp->private_data;
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req = 0;
+ ssize_t r = count;
+ unsigned xfer;
+ int sendZLP = 0;
+ int ret;
+
+ DBG(cdev, "mtp_write(%zu)\n", count);
+
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED) {
+ /* report cancelation to userspace */
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+ return -ECANCELED;
+ }
+ if (dev->state == STATE_OFFLINE) {
+ spin_unlock_irq(&dev->lock);
+ return -ENODEV;
+ }
+ dev->state = STATE_BUSY;
+ spin_unlock_irq(&dev->lock);
+
+ /* we need to send a zero length packet to signal the end of transfer
+ * if the transfer size is aligned to a packet boundary.
+ */
+ if ((count & (dev->ep_in->maxpacket - 1)) == 0)
+ sendZLP = 1;
+
+ while (count > 0 || sendZLP) {
+ /* so we exit after sending ZLP */
+ if (count == 0)
+ sendZLP = 0;
+
+ if (dev->state != STATE_BUSY) {
+ DBG(cdev, "mtp_write dev->error\n");
+ r = -EIO;
+ break;
+ }
+
+ /* get an idle tx request to use */
+ req = 0;
+ ret = wait_event_interruptible(dev->write_wq,
+ ((req = mtp_req_get(dev, &dev->tx_idle))
+ || dev->state != STATE_BUSY));
+ if (!req) {
+ r = ret;
+ break;
+ }
+
+ if (count > MTP_BULK_BUFFER_SIZE)
+ xfer = MTP_BULK_BUFFER_SIZE;
+ else
+ xfer = count;
+ if (xfer && copy_from_user(req->buf, buf, xfer)) {
+ r = -EFAULT;
+ break;
+ }
+
+ req->length = xfer;
+ ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
+ if (ret < 0) {
+ DBG(cdev, "mtp_write: xfer error %d\n", ret);
+ r = -EIO;
+ break;
+ }
+
+ buf += xfer;
+ count -= xfer;
+
+ /* zero this so we don't try to free it on error exit */
+ req = 0;
+ }
+
+ if (req)
+ mtp_req_put(dev, &dev->tx_idle, req);
+
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED)
+ r = -ECANCELED;
+ else if (dev->state != STATE_OFFLINE)
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+
+ DBG(cdev, "mtp_write returning %zd\n", r);
+ return r;
+}
+
+/* read from a local file and write to USB */
+static void send_file_work(struct work_struct *data)
+{
+ struct mtp_dev *dev = container_of(data, struct mtp_dev,
+ send_file_work);
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *req = 0;
+ struct mtp_data_header *header;
+ struct file *filp;
+ loff_t offset;
+ int64_t count;
+ int xfer, ret, hdr_size;
+ int r = 0;
+ int sendZLP = 0;
+
+ /* read our parameters */
+ smp_rmb();
+ filp = dev->xfer_file;
+ offset = dev->xfer_file_offset;
+ count = dev->xfer_file_length;
+
+ DBG(cdev, "send_file_work(%lld %lld)\n", offset, count);
+
+ if (dev->xfer_send_header) {
+ hdr_size = sizeof(struct mtp_data_header);
+ count += hdr_size;
+ } else {
+ hdr_size = 0;
+ }
+
+ /* we need to send a zero length packet to signal the end of transfer
+ * if the transfer size is aligned to a packet boundary.
+ */
+ if ((count & (dev->ep_in->maxpacket - 1)) == 0)
+ sendZLP = 1;
+
+ while (count > 0 || sendZLP) {
+ /* so we exit after sending ZLP */
+ if (count == 0)
+ sendZLP = 0;
+
+ /* get an idle tx request to use */
+ req = 0;
+ ret = wait_event_interruptible(dev->write_wq,
+ (req = mtp_req_get(dev, &dev->tx_idle))
+ || dev->state != STATE_BUSY);
+ if (dev->state == STATE_CANCELED) {
+ r = -ECANCELED;
+ break;
+ }
+ if (!req) {
+ r = ret;
+ break;
+ }
+
+ if (count > MTP_BULK_BUFFER_SIZE)
+ xfer = MTP_BULK_BUFFER_SIZE;
+ else
+ xfer = count;
+
+ if (hdr_size) {
+ /* prepend MTP data header */
+ header = (struct mtp_data_header *)req->buf;
+ header->length = __cpu_to_le32(count);
+ header->type = __cpu_to_le16(2); /* data packet */
+ header->command = __cpu_to_le16(dev->xfer_command);
+ header->transaction_id =
+ __cpu_to_le32(dev->xfer_transaction_id);
+ }
+
+ ret = vfs_read(filp, req->buf + hdr_size, xfer - hdr_size,
+ &offset);
+ if (ret < 0) {
+ r = ret;
+ break;
+ }
+ xfer = ret + hdr_size;
+ hdr_size = 0;
+
+ req->length = xfer;
+ ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
+ if (ret < 0) {
+ DBG(cdev, "send_file_work: xfer error %d\n", ret);
+ dev->state = STATE_ERROR;
+ r = -EIO;
+ break;
+ }
+
+ count -= xfer;
+
+ /* zero this so we don't try to free it on error exit */
+ req = 0;
+ }
+
+ if (req)
+ mtp_req_put(dev, &dev->tx_idle, req);
+
+ DBG(cdev, "send_file_work returning %d\n", r);
+ /* write the result */
+ dev->xfer_result = r;
+ smp_wmb();
+}
+
+/* read from USB and write to a local file */
+static void receive_file_work(struct work_struct *data)
+{
+ struct mtp_dev *dev = container_of(data, struct mtp_dev,
+ receive_file_work);
+ struct usb_composite_dev *cdev = dev->cdev;
+ struct usb_request *read_req = NULL, *write_req = NULL;
+ struct file *filp;
+ loff_t offset;
+ int64_t count;
+ int ret, cur_buf = 0;
+ int r = 0;
+
+ /* read our parameters */
+ smp_rmb();
+ filp = dev->xfer_file;
+ offset = dev->xfer_file_offset;
+ count = dev->xfer_file_length;
+
+ DBG(cdev, "receive_file_work(%lld)\n", count);
+
+ while (count > 0 || write_req) {
+ if (count > 0) {
+ /* queue a request */
+ read_req = dev->rx_req[cur_buf];
+ cur_buf = (cur_buf + 1) % RX_REQ_MAX;
+
+ read_req->length = (count > MTP_BULK_BUFFER_SIZE
+ ? MTP_BULK_BUFFER_SIZE : count);
+ dev->rx_done = 0;
+ ret = usb_ep_queue(dev->ep_out, read_req, GFP_KERNEL);
+ if (ret < 0) {
+ r = -EIO;
+ dev->state = STATE_ERROR;
+ break;
+ }
+ }
+
+ if (write_req) {
+ DBG(cdev, "rx %p %d\n", write_req, write_req->actual);
+ ret = vfs_write(filp, write_req->buf, write_req->actual,
+ &offset);
+ DBG(cdev, "vfs_write %d\n", ret);
+ if (ret != write_req->actual) {
+ r = -EIO;
+ dev->state = STATE_ERROR;
+ break;
+ }
+ write_req = NULL;
+ }
+
+ if (read_req) {
+ /* wait for our last read to complete */
+ ret = wait_event_interruptible(dev->read_wq,
+ dev->rx_done || dev->state != STATE_BUSY);
+ if (dev->state == STATE_CANCELED) {
+ r = -ECANCELED;
+ if (!dev->rx_done)
+ usb_ep_dequeue(dev->ep_out, read_req);
+ break;
+ }
+ /* if xfer_file_length is 0xFFFFFFFF, then we read until
+ * we get a zero length packet
+ */
+ if (count != 0xFFFFFFFF)
+ count -= read_req->actual;
+ if (read_req->actual < read_req->length) {
+ /*
+ * short packet is used to signal EOF for
+ * sizes > 4 gig
+ */
+ DBG(cdev, "got short packet\n");
+ count = 0;
+ }
+
+ write_req = read_req;
+ read_req = NULL;
+ }
+ }
+
+ DBG(cdev, "receive_file_work returning %d\n", r);
+ /* write the result */
+ dev->xfer_result = r;
+ smp_wmb();
+}
+
+static int mtp_send_event(struct mtp_dev *dev, struct mtp_event *event)
+{
+ struct usb_request *req = NULL;
+ int ret;
+ int length = event->length;
+
+ DBG(dev->cdev, "mtp_send_event(%zu)\n", event->length);
+
+ if (length < 0 || length > INTR_BUFFER_SIZE)
+ return -EINVAL;
+ if (dev->state == STATE_OFFLINE)
+ return -ENODEV;
+
+ ret = wait_event_interruptible_timeout(dev->intr_wq,
+ (req = mtp_req_get(dev, &dev->intr_idle)),
+ msecs_to_jiffies(1000));
+ if (!req)
+ return -ETIME;
+
+ if (copy_from_user(req->buf, (void __user *)event->data, length)) {
+ mtp_req_put(dev, &dev->intr_idle, req);
+ return -EFAULT;
+ }
+ req->length = length;
+ ret = usb_ep_queue(dev->ep_intr, req, GFP_KERNEL);
+ if (ret)
+ mtp_req_put(dev, &dev->intr_idle, req);
+
+ return ret;
+}
+
+static long mtp_ioctl(struct file *fp, unsigned code, unsigned long value)
+{
+ struct mtp_dev *dev = fp->private_data;
+ struct file *filp = NULL;
+ int ret = -EINVAL;
+
+ if (mtp_lock(&dev->ioctl_excl))
+ return -EBUSY;
+
+ switch (code) {
+ case MTP_SEND_FILE:
+ case MTP_RECEIVE_FILE:
+ case MTP_SEND_FILE_WITH_HEADER:
+ {
+ struct mtp_file_range mfr;
+ struct work_struct *work;
+
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED) {
+ /* report cancelation to userspace */
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+ ret = -ECANCELED;
+ goto out;
+ }
+ if (dev->state == STATE_OFFLINE) {
+ spin_unlock_irq(&dev->lock);
+ ret = -ENODEV;
+ goto out;
+ }
+ dev->state = STATE_BUSY;
+ spin_unlock_irq(&dev->lock);
+
+ if (copy_from_user(&mfr, (void __user *)value, sizeof(mfr))) {
+ ret = -EFAULT;
+ goto fail;
+ }
+ /* hold a reference to the file while we are working with it */
+ filp = fget(mfr.fd);
+ if (!filp) {
+ ret = -EBADF;
+ goto fail;
+ }
+
+ /* write the parameters */
+ dev->xfer_file = filp;
+ dev->xfer_file_offset = mfr.offset;
+ dev->xfer_file_length = mfr.length;
+ smp_wmb();
+
+ if (code == MTP_SEND_FILE_WITH_HEADER) {
+ work = &dev->send_file_work;
+ dev->xfer_send_header = 1;
+ dev->xfer_command = mfr.command;
+ dev->xfer_transaction_id = mfr.transaction_id;
+ } else if (code == MTP_SEND_FILE) {
+ work = &dev->send_file_work;
+ dev->xfer_send_header = 0;
+ } else {
+ work = &dev->receive_file_work;
+ }
+
+ /* We do the file transfer on a work queue so it will run
+ * in kernel context, which is necessary for vfs_read and
+ * vfs_write to use our buffers in the kernel address space.
+ */
+ queue_work(dev->wq, work);
+ /* wait for operation to complete */
+ flush_workqueue(dev->wq);
+ fput(filp);
+
+ /* read the result */
+ smp_rmb();
+ ret = dev->xfer_result;
+ break;
+ }
+ case MTP_SEND_EVENT:
+ {
+ struct mtp_event event;
+ /* return here so we don't change dev->state below,
+ * which would interfere with bulk transfer state.
+ */
+ if (copy_from_user(&event, (void __user *)value, sizeof(event)))
+ ret = -EFAULT;
+ else
+ ret = mtp_send_event(dev, &event);
+ goto out;
+ }
+ }
+
+fail:
+ spin_lock_irq(&dev->lock);
+ if (dev->state == STATE_CANCELED)
+ ret = -ECANCELED;
+ else if (dev->state != STATE_OFFLINE)
+ dev->state = STATE_READY;
+ spin_unlock_irq(&dev->lock);
+out:
+ mtp_unlock(&dev->ioctl_excl);
+ DBG(dev->cdev, "ioctl returning %d\n", ret);
+ return ret;
+}
+
+static int mtp_open(struct inode *ip, struct file *fp)
+{
+ printk(KERN_INFO "mtp_open\n");
+ if (mtp_lock(&_mtp_dev->open_excl))
+ return -EBUSY;
+
+ /* clear any error condition */
+ if (_mtp_dev->state != STATE_OFFLINE)
+ _mtp_dev->state = STATE_READY;
+
+ fp->private_data = _mtp_dev;
+ return 0;
+}
+
+static int mtp_release(struct inode *ip, struct file *fp)
+{
+ printk(KERN_INFO "mtp_release\n");
+
+ mtp_unlock(&_mtp_dev->open_excl);
+ return 0;
+}
+
+/* file operations for /dev/mtp_usb */
+static const struct file_operations mtp_fops = {
+ .owner = THIS_MODULE,
+ .read = mtp_read,
+ .write = mtp_write,
+ .unlocked_ioctl = mtp_ioctl,
+ .open = mtp_open,
+ .release = mtp_release,
+};
+
+static struct miscdevice mtp_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = mtp_shortname,
+ .fops = &mtp_fops,
+};
+
+static int mtp_ctrlrequest(struct usb_composite_dev *cdev,
+ const struct usb_ctrlrequest *ctrl)
+{
+ struct mtp_dev *dev = _mtp_dev;
+ int value = -EOPNOTSUPP;
+ u16 w_index = le16_to_cpu(ctrl->wIndex);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 w_length = le16_to_cpu(ctrl->wLength);
+ unsigned long flags;
+
+ VDBG(cdev, "mtp_ctrlrequest "
+ "%02x.%02x v%04x i%04x l%u\n",
+ ctrl->bRequestType, ctrl->bRequest,
+ w_value, w_index, w_length);
+
+ /* Handle MTP OS string */
+ if (ctrl->bRequestType ==
+ (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE)
+ && ctrl->bRequest == USB_REQ_GET_DESCRIPTOR
+ && (w_value >> 8) == USB_DT_STRING
+ && (w_value & 0xFF) == MTP_OS_STRING_ID) {
+ value = (w_length < sizeof(mtp_os_string)
+ ? w_length : sizeof(mtp_os_string));
+ memcpy(cdev->req->buf, mtp_os_string, value);
+ } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
+ /* Handle MTP OS descriptor */
+ DBG(cdev, "vendor request: %d index: %d value: %d length: %d\n",
+ ctrl->bRequest, w_index, w_value, w_length);
+
+ if (ctrl->bRequest == 1
+ && (ctrl->bRequestType & USB_DIR_IN)
+ && (w_index == 4 || w_index == 5)) {
+ value = (w_length < sizeof(mtp_ext_config_desc) ?
+ w_length : sizeof(mtp_ext_config_desc));
+ memcpy(cdev->req->buf, &mtp_ext_config_desc, value);
+ }
+ } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
+ DBG(cdev, "class request: %d index: %d value: %d length: %d\n",
+ ctrl->bRequest, w_index, w_value, w_length);
+
+ if (ctrl->bRequest == MTP_REQ_CANCEL && w_index == 0
+ && w_value == 0) {
+ DBG(cdev, "MTP_REQ_CANCEL\n");
+
+ spin_lock_irqsave(&dev->lock, flags);
+ if (dev->state == STATE_BUSY) {
+ dev->state = STATE_CANCELED;
+ wake_up(&dev->read_wq);
+ wake_up(&dev->write_wq);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* We need to queue a request to read the remaining
+ * bytes, but we don't actually need to look at
+ * the contents.
+ */
+ value = w_length;
+ } else if (ctrl->bRequest == MTP_REQ_GET_DEVICE_STATUS
+ && w_index == 0 && w_value == 0) {
+ struct mtp_device_status *status = cdev->req->buf;
+
+ status->wLength =
+ __constant_cpu_to_le16(sizeof(*status));
+
+ DBG(cdev, "MTP_REQ_GET_DEVICE_STATUS\n");
+ spin_lock_irqsave(&dev->lock, flags);
+ /* device status is "busy" until we report
+ * the cancelation to userspace
+ */
+ if (dev->state == STATE_CANCELED)
+ status->wCode =
+ __cpu_to_le16(MTP_RESPONSE_DEVICE_BUSY);
+ else
+ status->wCode =
+ __cpu_to_le16(MTP_RESPONSE_OK);
+ spin_unlock_irqrestore(&dev->lock, flags);
+ value = sizeof(*status);
+ }
+ }
+
+ /* respond with data transfer or status phase? */
+ if (value >= 0) {
+ int rc;
+
+ cdev->req->zero = value < w_length;
+ cdev->req->length = value;
+ rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
+ if (rc < 0)
+ ERROR(cdev, "%s: response queue error\n", __func__);
+ }
+ return value;
+}
+
+static int
+mtp_function_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct mtp_dev *dev = func_to_mtp(f);
+ int id;
+ int ret;
+ struct mtp_instance *fi_mtp;
+
+ dev->cdev = cdev;
+ DBG(cdev, "mtp_function_bind dev: %p\n", dev);
+
+ /* allocate interface ID(s) */
+ id = usb_interface_id(c, f);
+ if (id < 0)
+ return id;
+ mtp_interface_desc.bInterfaceNumber = id;
+
+ if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) {
+ ret = usb_string_id(c->cdev);
+ if (ret < 0)
+ return ret;
+ mtp_string_defs[INTERFACE_STRING_INDEX].id = ret;
+ mtp_interface_desc.iInterface = ret;
+ }
+
+ fi_mtp = container_of(f->fi, struct mtp_instance, func_inst);
+
+ if (cdev->use_os_string) {
+ f->os_desc_table = kzalloc(sizeof(*f->os_desc_table),
+ GFP_KERNEL);
+ if (!f->os_desc_table)
+ return -ENOMEM;
+ f->os_desc_n = 1;
+ f->os_desc_table[0].os_desc = &fi_mtp->mtp_os_desc;
+ }
+
+ /* allocate endpoints */
+ ret = mtp_create_bulk_endpoints(dev, &mtp_fullspeed_in_desc,
+ &mtp_fullspeed_out_desc, &mtp_intr_desc);
+ if (ret)
+ return ret;
+
+ /* support high speed hardware */
+ if (gadget_is_dualspeed(c->cdev->gadget)) {
+ mtp_highspeed_in_desc.bEndpointAddress =
+ mtp_fullspeed_in_desc.bEndpointAddress;
+ mtp_highspeed_out_desc.bEndpointAddress =
+ mtp_fullspeed_out_desc.bEndpointAddress;
+ }
+ /* support super speed hardware */
+ if (gadget_is_superspeed(c->cdev->gadget)) {
+ unsigned max_burst;
+
+ /* Calculate bMaxBurst, we know packet size is 1024 */
+ max_burst = min_t(unsigned, MTP_BULK_BUFFER_SIZE / 1024, 15);
+ mtp_ss_in_desc.bEndpointAddress =
+ mtp_fullspeed_in_desc.bEndpointAddress;
+ mtp_ss_in_comp_desc.bMaxBurst = max_burst;
+ mtp_ss_out_desc.bEndpointAddress =
+ mtp_fullspeed_out_desc.bEndpointAddress;
+ mtp_ss_out_comp_desc.bMaxBurst = max_burst;
+ }
+
+ DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
+ gadget_is_superspeed(c->cdev->gadget) ? "super" :
+ (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full"),
+ f->name, dev->ep_in->name, dev->ep_out->name);
+ return 0;
+}
+
+static void
+mtp_function_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct mtp_dev *dev = func_to_mtp(f);
+ struct usb_request *req;
+ int i;
+
+ mtp_string_defs[INTERFACE_STRING_INDEX].id = 0;
+ while ((req = mtp_req_get(dev, &dev->tx_idle)))
+ mtp_request_free(req, dev->ep_in);
+ for (i = 0; i < RX_REQ_MAX; i++)
+ mtp_request_free(dev->rx_req[i], dev->ep_out);
+ while ((req = mtp_req_get(dev, &dev->intr_idle)))
+ mtp_request_free(req, dev->ep_intr);
+ dev->state = STATE_OFFLINE;
+ kfree(f->os_desc_table);
+ f->os_desc_n = 0;
+}
+
+static int mtp_function_set_alt(struct usb_function *f,
+ unsigned intf, unsigned alt)
+{
+ struct mtp_dev *dev = func_to_mtp(f);
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int ret;
+
+ DBG(cdev, "mtp_function_set_alt intf: %d alt: %d\n", intf, alt);
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_in);
+ if (ret)
+ return ret;
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_out);
+ if (ret) {
+ usb_ep_disable(dev->ep_in);
+ return ret;
+ }
+
+ ret = config_ep_by_speed(cdev->gadget, f, dev->ep_intr);
+ if (ret)
+ return ret;
+
+ ret = usb_ep_enable(dev->ep_intr);
+ if (ret) {
+ usb_ep_disable(dev->ep_out);
+ usb_ep_disable(dev->ep_in);
+ return ret;
+ }
+ dev->state = STATE_READY;
+
+ /* readers may be blocked waiting for us to go online */
+ wake_up(&dev->read_wq);
+ return 0;
+}
+
+static void mtp_function_disable(struct usb_function *f)
+{
+ struct mtp_dev *dev = func_to_mtp(f);
+ struct usb_composite_dev *cdev = dev->cdev;
+
+ DBG(cdev, "mtp_function_disable\n");
+ dev->state = STATE_OFFLINE;
+ usb_ep_disable(dev->ep_in);
+ usb_ep_disable(dev->ep_out);
+ usb_ep_disable(dev->ep_intr);
+
+ /* readers may be blocked waiting for us to go online */
+ wake_up(&dev->read_wq);
+
+ VDBG(cdev, "%s disabled\n", dev->function.name);
+}
+
+static int __mtp_setup(struct mtp_instance *fi_mtp)
+{
+ struct mtp_dev *dev;
+ int ret;
+
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+
+ if (fi_mtp != NULL)
+ fi_mtp->dev = dev;
+
+ if (!dev)
+ return -ENOMEM;
+
+ spin_lock_init(&dev->lock);
+ init_waitqueue_head(&dev->read_wq);
+ init_waitqueue_head(&dev->write_wq);
+ init_waitqueue_head(&dev->intr_wq);
+ atomic_set(&dev->open_excl, 0);
+ atomic_set(&dev->ioctl_excl, 0);
+ INIT_LIST_HEAD(&dev->tx_idle);
+ INIT_LIST_HEAD(&dev->intr_idle);
+
+ dev->wq = create_singlethread_workqueue("f_mtp");
+ if (!dev->wq) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+ INIT_WORK(&dev->send_file_work, send_file_work);
+ INIT_WORK(&dev->receive_file_work, receive_file_work);
+
+ _mtp_dev = dev;
+
+ ret = misc_register(&mtp_device);
+ if (ret)
+ goto err2;
+
+ return 0;
+
+err2:
+ destroy_workqueue(dev->wq);
+err1:
+ _mtp_dev = NULL;
+ kfree(dev);
+ printk(KERN_ERR "mtp gadget driver failed to initialize\n");
+ return ret;
+}
+
+static int mtp_setup_configfs(struct mtp_instance *fi_mtp)
+{
+ return __mtp_setup(fi_mtp);
+}
+
+
+static void mtp_cleanup(void)
+{
+ struct mtp_dev *dev = _mtp_dev;
+
+ if (!dev)
+ return;
+
+ misc_deregister(&mtp_device);
+ destroy_workqueue(dev->wq);
+ _mtp_dev = NULL;
+ kfree(dev);
+}
+
+static struct mtp_instance *to_mtp_instance(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct mtp_instance,
+ func_inst.group);
+}
+
+static void mtp_attr_release(struct config_item *item)
+{
+ struct mtp_instance *fi_mtp = to_mtp_instance(item);
+
+ usb_put_function_instance(&fi_mtp->func_inst);
+}
+
+static struct configfs_item_operations mtp_item_ops = {
+ .release = mtp_attr_release,
+};
+
+static struct config_item_type mtp_func_type = {
+ .ct_item_ops = &mtp_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+
+static struct mtp_instance *to_fi_mtp(struct usb_function_instance *fi)
+{
+ return container_of(fi, struct mtp_instance, func_inst);
+}
+
+static int mtp_set_inst_name(struct usb_function_instance *fi, const char *name)
+{
+ struct mtp_instance *fi_mtp;
+ char *ptr;
+ int name_len;
+
+ name_len = strlen(name) + 1;
+ if (name_len > MAX_INST_NAME_LEN)
+ return -ENAMETOOLONG;
+
+ ptr = kstrndup(name, name_len, GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ fi_mtp = to_fi_mtp(fi);
+ fi_mtp->name = ptr;
+
+ return 0;
+}
+
+static void mtp_free_inst(struct usb_function_instance *fi)
+{
+ struct mtp_instance *fi_mtp;
+
+ fi_mtp = to_fi_mtp(fi);
+ kfree(fi_mtp->name);
+ mtp_cleanup();
+ kfree(fi_mtp->mtp_os_desc.group.default_groups);
+ kfree(fi_mtp);
+}
+
+struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config)
+{
+ struct mtp_instance *fi_mtp;
+ int ret = 0;
+ struct usb_os_desc *descs[1];
+ char *names[1];
+
+ fi_mtp = kzalloc(sizeof(*fi_mtp), GFP_KERNEL);
+ if (!fi_mtp)
+ return ERR_PTR(-ENOMEM);
+ fi_mtp->func_inst.set_inst_name = mtp_set_inst_name;
+ fi_mtp->func_inst.free_func_inst = mtp_free_inst;
+
+ fi_mtp->mtp_os_desc.ext_compat_id = fi_mtp->mtp_ext_compat_id;
+ INIT_LIST_HEAD(&fi_mtp->mtp_os_desc.ext_prop);
+ descs[0] = &fi_mtp->mtp_os_desc;
+ names[0] = "MTP";
+ usb_os_desc_prepare_interf_dir(&fi_mtp->func_inst.group, 1,
+ descs, names, THIS_MODULE);
+
+ if (mtp_config) {
+ ret = mtp_setup_configfs(fi_mtp);
+ if (ret) {
+ kfree(fi_mtp);
+ pr_err("Error setting MTP\n");
+ return ERR_PTR(ret);
+ }
+ } else
+ fi_mtp->dev = _mtp_dev;
+
+ config_group_init_type_name(&fi_mtp->func_inst.group,
+ "", &mtp_func_type);
+
+ return &fi_mtp->func_inst;
+}
+EXPORT_SYMBOL_GPL(alloc_inst_mtp_ptp);
+
+static struct usb_function_instance *mtp_alloc_inst(void)
+{
+ return alloc_inst_mtp_ptp(true);
+}
+
+static int mtp_ctrlreq_configfs(struct usb_function *f,
+ const struct usb_ctrlrequest *ctrl)
+{
+ return mtp_ctrlrequest(f->config->cdev, ctrl);
+}
+
+static void mtp_free(struct usb_function *f)
+{
+ /*NO-OP: no function specific resource allocation in mtp_alloc*/
+}
+
+struct usb_function *function_alloc_mtp_ptp(struct usb_function_instance *fi,
+ bool mtp_config)
+{
+ struct mtp_instance *fi_mtp = to_fi_mtp(fi);
+ struct mtp_dev *dev;
+
+ /*
+ * PTP piggybacks on MTP function so make sure we have
+ * created MTP function before we associate this PTP
+ * function with a gadget configuration.
+ */
+ if (fi_mtp->dev == NULL) {
+ pr_err("Error: Create MTP function before linking"
+ " PTP function with a gadget configuration\n");
+ pr_err("\t1: Delete existing PTP function if any\n");
+ pr_err("\t2: Create MTP function\n");
+ pr_err("\t3: Create and symlink PTP function"
+ " with a gadget configuration\n");
+ return ERR_PTR(-EINVAL); /* Invalid Configuration */
+ }
+
+ dev = fi_mtp->dev;
+ dev->function.name = DRIVER_NAME;
+ dev->function.strings = mtp_strings;
+ if (mtp_config) {
+ dev->function.fs_descriptors = fs_mtp_descs;
+ dev->function.hs_descriptors = hs_mtp_descs;
+ dev->function.ss_descriptors = ss_mtp_descs;
+ } else {
+ dev->function.fs_descriptors = fs_ptp_descs;
+ dev->function.hs_descriptors = hs_ptp_descs;
+ dev->function.ss_descriptors = ss_ptp_descs;
+ }
+ dev->function.bind = mtp_function_bind;
+ dev->function.unbind = mtp_function_unbind;
+ dev->function.set_alt = mtp_function_set_alt;
+ dev->function.disable = mtp_function_disable;
+ dev->function.setup = mtp_ctrlreq_configfs;
+ dev->function.free_func = mtp_free;
+
+ return &dev->function;
+}
+EXPORT_SYMBOL_GPL(function_alloc_mtp_ptp);
+
+static struct usb_function *mtp_alloc(struct usb_function_instance *fi)
+{
+ return function_alloc_mtp_ptp(fi, true);
+}
+
+DECLARE_USB_FUNCTION_INIT(mtp, mtp_alloc_inst, mtp_alloc);
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/gadget/function/f_mtp.h b/drivers/usb/gadget/function/f_mtp.h
new file mode 100644
index 000000000000..7adb1ff08eff
--- /dev/null
+++ b/drivers/usb/gadget/function/f_mtp.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2014 Google, Inc.
+ * Author: Badhri Jagan Sridharan <badhri@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+extern struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config);
+extern struct usb_function *function_alloc_mtp_ptp(
+ struct usb_function_instance *fi, bool mtp_config);
diff --git a/drivers/usb/gadget/function/f_ptp.c b/drivers/usb/gadget/function/f_ptp.c
new file mode 100644
index 000000000000..da3e4d53e085
--- /dev/null
+++ b/drivers/usb/gadget/function/f_ptp.c
@@ -0,0 +1,38 @@
+/*
+ * Gadget Function Driver for PTP
+ *
+ * Copyright (C) 2014 Google, Inc.
+ * Author: Badhri Jagan Sridharan <badhri@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include <linux/configfs.h>
+#include <linux/usb/composite.h>
+
+#include "f_mtp.h"
+
+static struct usb_function_instance *ptp_alloc_inst(void)
+{
+ return alloc_inst_mtp_ptp(false);
+}
+
+static struct usb_function *ptp_alloc(struct usb_function_instance *fi)
+{
+ return function_alloc_mtp_ptp(fi, false);
+}
+
+DECLARE_USB_FUNCTION_INIT(ptp, ptp_alloc_inst, ptp_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Badhri Jagan Sridharan");
diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index e587767e374c..3a28d8ac3b3d 100644
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -70,6 +70,16 @@
* - MS-Windows drivers sometimes emit undocumented requests.
*/
+static unsigned int rndis_dl_max_pkt_per_xfer = 3;
+module_param(rndis_dl_max_pkt_per_xfer, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(rndis_dl_max_pkt_per_xfer,
+ "Maximum packets per transfer for DL aggregation");
+
+static unsigned int rndis_ul_max_pkt_per_xfer = 3;
+module_param(rndis_ul_max_pkt_per_xfer, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(rndis_ul_max_pkt_per_xfer,
+ "Maximum packets per transfer for UL aggregation");
+
struct f_rndis {
struct gether port;
u8 ctrl_id, data_id;
@@ -449,7 +459,9 @@ static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_rndis *rndis = req->context;
+ struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
int status;
+ rndis_init_msg_type *buf;
/* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
// spin_lock(&dev->lock);
@@ -457,6 +469,21 @@ static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
if (status < 0)
pr_err("RNDIS command error %d, %d/%d\n",
status, req->actual, req->length);
+
+ buf = (rndis_init_msg_type *)req->buf;
+
+ if (buf->MessageType == RNDIS_MSG_INIT) {
+ if (buf->MaxTransferSize > 2048)
+ rndis->port.multi_pkt_xfer = 1;
+ else
+ rndis->port.multi_pkt_xfer = 0;
+ DBG(cdev, "%s: MaxTransferSize: %d : Multi_pkt_txr: %s\n",
+ __func__, buf->MaxTransferSize,
+ rndis->port.multi_pkt_xfer ? "enabled" :
+ "disabled");
+ if (rndis_dl_max_pkt_per_xfer <= 1)
+ rndis->port.multi_pkt_xfer = 0;
+ }
// spin_unlock(&dev->lock);
}
@@ -792,6 +819,7 @@ rndis_bind(struct usb_configuration *c, struct usb_function *f)
rndis_set_param_medium(rndis->params, RNDIS_MEDIUM_802_3, 0);
rndis_set_host_mac(rndis->params, rndis->ethaddr);
+ rndis_set_max_pkt_xfer(rndis->params, rndis_ul_max_pkt_per_xfer);
if (rndis->manufacturer && rndis->vendorID &&
rndis_set_param_vendor(rndis->params, rndis->vendorID,
@@ -978,6 +1006,8 @@ static struct usb_function *rndis_alloc(struct usb_function_instance *fi)
rndis->port.header_len = sizeof(struct rndis_packet_msg_type);
rndis->port.wrap = rndis_add_header;
rndis->port.unwrap = rndis_rm_hdr;
+ rndis->port.ul_max_pkts_per_xfer = rndis_ul_max_pkt_per_xfer;
+ rndis->port.dl_max_pkts_per_xfer = rndis_dl_max_pkt_per_xfer;
rndis->port.func.name = "rndis";
/* descriptors are per-instance copies */
diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index 70d3917cc003..2ec7171b3f04 100644
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -42,6 +42,16 @@
#include "rndis.h"
+int rndis_ul_max_pkt_per_xfer_rcvd;
+module_param(rndis_ul_max_pkt_per_xfer_rcvd, int, S_IRUGO);
+MODULE_PARM_DESC(rndis_ul_max_pkt_per_xfer_rcvd,
+ "Max num of REMOTE_NDIS_PACKET_MSGs received in a single transfer");
+
+int rndis_ul_max_xfer_size_rcvd;
+module_param(rndis_ul_max_xfer_size_rcvd, int, S_IRUGO);
+MODULE_PARM_DESC(rndis_ul_max_xfer_size_rcvd,
+ "Max size of bus transfer received");
+
/* The driver for your USB chip needs to support ep0 OUT to work with
* RNDIS, plus all three CDC Ethernet endpoints (interrupt not optional).
@@ -579,12 +589,12 @@ static int rndis_init_response(struct rndis_params *params,
resp->MinorVersion = cpu_to_le32(RNDIS_MINOR_VERSION);
resp->DeviceFlags = cpu_to_le32(RNDIS_DF_CONNECTIONLESS);
resp->Medium = cpu_to_le32(RNDIS_MEDIUM_802_3);
- resp->MaxPacketsPerTransfer = cpu_to_le32(1);
- resp->MaxTransferSize = cpu_to_le32(
- params->dev->mtu
+ resp->MaxPacketsPerTransfer = cpu_to_le32(params->max_pkt_per_xfer);
+ resp->MaxTransferSize = cpu_to_le32(params->max_pkt_per_xfer *
+ (params->dev->mtu
+ sizeof(struct ethhdr)
+ sizeof(struct rndis_packet_msg_type)
- + 22);
+ + 22));
resp->PacketAlignmentFactor = cpu_to_le32(0);
resp->AFListOffset = cpu_to_le32(0);
resp->AFListSize = cpu_to_le32(0);
@@ -681,6 +691,13 @@ static int rndis_reset_response(struct rndis_params *params,
rndis_reset_cmplt_type *resp;
rndis_resp_t *r;
+ u32 length;
+ u8 *xbuf;
+
+ /* drain the response queue */
+ while ((xbuf = rndis_get_next_response(params, &length)))
+ rndis_free_response(params, xbuf);
+
r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type));
if (!r)
return -ENOMEM;
@@ -957,6 +974,8 @@ int rndis_set_param_dev(struct rndis_params *params, struct net_device *dev,
params->dev = dev;
params->filter = cdc_filter;
+ rndis_ul_max_xfer_size_rcvd = 0;
+ rndis_ul_max_pkt_per_xfer_rcvd = 0;
return 0;
}
EXPORT_SYMBOL_GPL(rndis_set_param_dev);
@@ -989,6 +1008,13 @@ int rndis_set_param_medium(struct rndis_params *params, u32 medium, u32 speed)
}
EXPORT_SYMBOL_GPL(rndis_set_param_medium);
+void rndis_set_max_pkt_xfer(struct rndis_params *params, u8 max_pkt_per_xfer)
+{
+ pr_debug("%s:\n", __func__);
+
+ params->max_pkt_per_xfer = max_pkt_per_xfer;
+}
+
void rndis_add_hdr(struct sk_buff *skb)
{
struct rndis_packet_msg_type *header;
@@ -1061,23 +1087,73 @@ int rndis_rm_hdr(struct gether *port,
struct sk_buff *skb,
struct sk_buff_head *list)
{
- /* tmp points to a struct rndis_packet_msg_type */
- __le32 *tmp = (void *)skb->data;
+ int num_pkts = 1;
- /* MessageType, MessageLength */
- if (cpu_to_le32(RNDIS_MSG_PACKET)
- != get_unaligned(tmp++)) {
- dev_kfree_skb_any(skb);
- return -EINVAL;
- }
- tmp++;
+ if (skb->len > rndis_ul_max_xfer_size_rcvd)
+ rndis_ul_max_xfer_size_rcvd = skb->len;
+
+ while (skb->len) {
+ struct rndis_packet_msg_type *hdr;
+ struct sk_buff *skb2;
+ u32 msg_len, data_offset, data_len;
- /* DataOffset, DataLength */
- if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
- dev_kfree_skb_any(skb);
- return -EOVERFLOW;
+ /* some rndis hosts send extra byte to avoid zlp, ignore it */
+ if (skb->len == 1) {
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
+ if (skb->len < sizeof *hdr) {
+ pr_err("invalid rndis pkt: skblen:%u hdr_len:%zu",
+ skb->len, sizeof *hdr);
+ dev_kfree_skb_any(skb);
+ return -EINVAL;
+ }
+
+ hdr = (void *)skb->data;
+ msg_len = le32_to_cpu(hdr->MessageLength);
+ data_offset = le32_to_cpu(hdr->DataOffset);
+ data_len = le32_to_cpu(hdr->DataLength);
+
+ if (skb->len < msg_len ||
+ ((data_offset + data_len + 8) > msg_len)) {
+ pr_err("invalid rndis message: %d/%d/%d/%d, len:%d\n",
+ le32_to_cpu(hdr->MessageType),
+ msg_len, data_offset, data_len, skb->len);
+ dev_kfree_skb_any(skb);
+ return -EOVERFLOW;
+ }
+ if (le32_to_cpu(hdr->MessageType) != RNDIS_MSG_PACKET) {
+ pr_err("invalid rndis message: %d/%d/%d/%d, len:%d\n",
+ le32_to_cpu(hdr->MessageType),
+ msg_len, data_offset, data_len, skb->len);
+ dev_kfree_skb_any(skb);
+ return -EINVAL;
+ }
+
+ skb_pull(skb, data_offset + 8);
+
+ if (msg_len == skb->len) {
+ skb_trim(skb, data_len);
+ break;
+ }
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (!skb2) {
+ pr_err("%s:skb clone failed\n", __func__);
+ dev_kfree_skb_any(skb);
+ return -ENOMEM;
+ }
+
+ skb_pull(skb, msg_len - sizeof *hdr);
+ skb_trim(skb2, data_len);
+ skb_queue_tail(list, skb2);
+
+ num_pkts++;
}
- skb_trim(skb, get_unaligned_le32(tmp++));
+
+ if (num_pkts > rndis_ul_max_pkt_per_xfer_rcvd)
+ rndis_ul_max_pkt_per_xfer_rcvd = num_pkts;
skb_queue_tail(list, skb);
return 0;
diff --git a/drivers/usb/gadget/function/rndis.h b/drivers/usb/gadget/function/rndis.h
index ef92eb66d8ad..310cac3f088e 100644
--- a/drivers/usb/gadget/function/rndis.h
+++ b/drivers/usb/gadget/function/rndis.h
@@ -190,6 +190,7 @@ typedef struct rndis_params
struct net_device *dev;
u32 vendorID;
+ u8 max_pkt_per_xfer;
const char *vendorDescr;
void (*resp_avail)(void *v);
void *v;
@@ -206,6 +207,7 @@ int rndis_set_param_vendor(struct rndis_params *params, u32 vendorID,
const char *vendorDescr);
int rndis_set_param_medium(struct rndis_params *params, u32 medium,
u32 speed);
+void rndis_set_max_pkt_xfer(struct rndis_params *params, u8 max_pkt_per_xfer);
void rndis_add_hdr(struct sk_buff *skb);
int rndis_rm_hdr(struct gether *port, struct sk_buff *skb,
struct sk_buff_head *list);
diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 7413f89660f7..e4920e5e1d64 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -53,6 +53,8 @@
* blocks and still have efficient handling. */
#define GETHER_MAX_ETH_FRAME_LEN 15412
+static struct workqueue_struct *uether_wq;
+
struct eth_dev {
/* lock is held while accessing port_usb
*/
@@ -64,19 +66,27 @@ struct eth_dev {
spinlock_t req_lock; /* guard {rx,tx}_reqs */
struct list_head tx_reqs, rx_reqs;
- atomic_t tx_qlen;
+ unsigned tx_qlen;
+/* Minimum number of TX USB request queued to UDC */
+#define TX_REQ_THRESHOLD 5
+ int no_tx_req_used;
+ int tx_skb_hold_count;
+ u32 tx_req_bufsize;
struct sk_buff_head rx_frames;
unsigned qmult;
unsigned header_len;
+ unsigned ul_max_pkts_per_xfer;
+ unsigned dl_max_pkts_per_xfer;
struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb);
int (*unwrap)(struct gether *,
struct sk_buff *skb,
struct sk_buff_head *list);
struct work_struct work;
+ struct work_struct rx_work;
unsigned long todo;
#define WORK_RX_MEMORY 0
@@ -230,9 +240,13 @@ rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
size += out->maxpacket - 1;
size -= size % out->maxpacket;
+ if (dev->ul_max_pkts_per_xfer)
+ size *= dev->ul_max_pkts_per_xfer;
+
if (dev->port_usb->is_fixed)
size = max_t(size_t, size, dev->port_usb->fixed_out_len);
+ DBG(dev, "%s: size: %zd\n", __func__, size);
skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags);
if (skb == NULL) {
DBG(dev, "no rx skb\n");
@@ -258,18 +272,16 @@ enomem:
DBG(dev, "rx submit --> %d\n", retval);
if (skb)
dev_kfree_skb_any(skb);
- spin_lock_irqsave(&dev->req_lock, flags);
- list_add(&req->list, &dev->rx_reqs);
- spin_unlock_irqrestore(&dev->req_lock, flags);
}
return retval;
}
static void rx_complete(struct usb_ep *ep, struct usb_request *req)
{
- struct sk_buff *skb = req->context, *skb2;
+ struct sk_buff *skb = req->context;
struct eth_dev *dev = ep->driver_data;
int status = req->status;
+ bool queue = 0;
switch (status) {
@@ -285,6 +297,10 @@ static void rx_complete(struct usb_ep *ep, struct usb_request *req)
status = dev->unwrap(dev->port_usb,
skb,
&dev->rx_frames);
+ if (status == -EINVAL)
+ dev->net->stats.rx_errors++;
+ else if (status == -EOVERFLOW)
+ dev->net->stats.rx_over_errors++;
} else {
dev_kfree_skb_any(skb);
status = -ENOTCONN;
@@ -293,30 +309,8 @@ static void rx_complete(struct usb_ep *ep, struct usb_request *req)
} else {
skb_queue_tail(&dev->rx_frames, skb);
}
- skb = NULL;
-
- skb2 = skb_dequeue(&dev->rx_frames);
- while (skb2) {
- if (status < 0
- || ETH_HLEN > skb2->len
- || skb2->len > GETHER_MAX_ETH_FRAME_LEN) {
- dev->net->stats.rx_errors++;
- dev->net->stats.rx_length_errors++;
- DBG(dev, "rx length %d\n", skb2->len);
- dev_kfree_skb_any(skb2);
- goto next_frame;
- }
- skb2->protocol = eth_type_trans(skb2, dev->net);
- dev->net->stats.rx_packets++;
- dev->net->stats.rx_bytes += skb2->len;
-
- /* no buffer copies needed, unless hardware can't
- * use skb buffers.
- */
- status = netif_rx(skb2);
-next_frame:
- skb2 = skb_dequeue(&dev->rx_frames);
- }
+ if (!status)
+ queue = 1;
break;
/* software-driven interface shutdown */
@@ -339,22 +333,20 @@ quiesce:
/* FALLTHROUGH */
default:
+ queue = 1;
+ dev_kfree_skb_any(skb);
dev->net->stats.rx_errors++;
DBG(dev, "rx status %d\n", status);
break;
}
- if (skb)
- dev_kfree_skb_any(skb);
- if (!netif_running(dev->net)) {
clean:
- spin_lock(&dev->req_lock);
- list_add(&req->list, &dev->rx_reqs);
- spin_unlock(&dev->req_lock);
- req = NULL;
- }
- if (req)
- rx_submit(dev, req, GFP_ATOMIC);
+ spin_lock(&dev->req_lock);
+ list_add(&req->list, &dev->rx_reqs);
+ spin_unlock(&dev->req_lock);
+
+ if (queue)
+ queue_work(uether_wq, &dev->rx_work);
}
static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n)
@@ -419,16 +411,24 @@ static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags)
{
struct usb_request *req;
unsigned long flags;
+ int req_cnt = 0;
/* fill unused rxq slots with some skb */
spin_lock_irqsave(&dev->req_lock, flags);
while (!list_empty(&dev->rx_reqs)) {
+ /* break the nexus of continuous completion and re-submission*/
+ if (++req_cnt > qlen(dev->gadget, dev->qmult))
+ break;
+
req = container_of(dev->rx_reqs.next,
struct usb_request, list);
list_del_init(&req->list);
spin_unlock_irqrestore(&dev->req_lock, flags);
if (rx_submit(dev, req, gfp_flags) < 0) {
+ spin_lock_irqsave(&dev->req_lock, flags);
+ list_add(&req->list, &dev->rx_reqs);
+ spin_unlock_irqrestore(&dev->req_lock, flags);
defer_kevent(dev, WORK_RX_MEMORY);
return;
}
@@ -438,6 +438,36 @@ static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags)
spin_unlock_irqrestore(&dev->req_lock, flags);
}
+static void process_rx_w(struct work_struct *work)
+{
+ struct eth_dev *dev = container_of(work, struct eth_dev, rx_work);
+ struct sk_buff *skb;
+ int status = 0;
+
+ if (!dev->port_usb)
+ return;
+
+ while ((skb = skb_dequeue(&dev->rx_frames))) {
+ if (status < 0
+ || ETH_HLEN > skb->len
+ || skb->len > ETH_FRAME_LEN) {
+ dev->net->stats.rx_errors++;
+ dev->net->stats.rx_length_errors++;
+ DBG(dev, "rx length %d\n", skb->len);
+ dev_kfree_skb_any(skb);
+ continue;
+ }
+ skb->protocol = eth_type_trans(skb, dev->net);
+ dev->net->stats.rx_packets++;
+ dev->net->stats.rx_bytes += skb->len;
+
+ status = netif_rx_ni(skb);
+ }
+
+ if (netif_running(dev->net))
+ rx_fill(dev, GFP_KERNEL);
+}
+
static void eth_work(struct work_struct *work)
{
struct eth_dev *dev = container_of(work, struct eth_dev, work);
@@ -455,6 +485,11 @@ static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
struct sk_buff *skb = req->context;
struct eth_dev *dev = ep->driver_data;
+ struct net_device *net = dev->net;
+ struct usb_request *new_req;
+ struct usb_ep *in;
+ int length;
+ int retval;
switch (req->status) {
default:
@@ -465,16 +500,74 @@ static void tx_complete(struct usb_ep *ep, struct usb_request *req)
case -ESHUTDOWN: /* disconnect etc */
break;
case 0:
- dev->net->stats.tx_bytes += skb->len;
+ if (!req->zero)
+ dev->net->stats.tx_bytes += req->length-1;
+ else
+ dev->net->stats.tx_bytes += req->length;
}
dev->net->stats.tx_packets++;
spin_lock(&dev->req_lock);
- list_add(&req->list, &dev->tx_reqs);
- spin_unlock(&dev->req_lock);
- dev_kfree_skb_any(skb);
+ list_add_tail(&req->list, &dev->tx_reqs);
+
+ if (dev->port_usb->multi_pkt_xfer) {
+ dev->no_tx_req_used--;
+ req->length = 0;
+ in = dev->port_usb->in_ep;
+
+ if (!list_empty(&dev->tx_reqs)) {
+ new_req = container_of(dev->tx_reqs.next,
+ struct usb_request, list);
+ list_del(&new_req->list);
+ spin_unlock(&dev->req_lock);
+ if (new_req->length > 0) {
+ length = new_req->length;
+
+ /* NCM requires no zlp if transfer is
+ * dwNtbInMaxSize */
+ if (dev->port_usb->is_fixed &&
+ length == dev->port_usb->fixed_in_len &&
+ (length % in->maxpacket) == 0)
+ new_req->zero = 0;
+ else
+ new_req->zero = 1;
+
+ /* use zlp framing on tx for strict CDC-Ether
+ * conformance, though any robust network rx
+ * path ignores extra padding. and some hardware
+ * doesn't like to write zlps.
+ */
+ if (new_req->zero && !dev->zlp &&
+ (length % in->maxpacket) == 0) {
+ new_req->zero = 0;
+ length++;
+ }
+
+ new_req->length = length;
+ retval = usb_ep_queue(in, new_req, GFP_ATOMIC);
+ switch (retval) {
+ default:
+ DBG(dev, "tx queue err %d\n", retval);
+ break;
+ case 0:
+ spin_lock(&dev->req_lock);
+ dev->no_tx_req_used++;
+ spin_unlock(&dev->req_lock);
+ net->trans_start = jiffies;
+ }
+ } else {
+ spin_lock(&dev->req_lock);
+ list_add(&new_req->list, &dev->tx_reqs);
+ spin_unlock(&dev->req_lock);
+ }
+ } else {
+ spin_unlock(&dev->req_lock);
+ }
+ } else {
+ spin_unlock(&dev->req_lock);
+ dev_kfree_skb_any(skb);
+ }
- atomic_dec(&dev->tx_qlen);
if (netif_carrier_ok(dev->net))
netif_wake_queue(dev->net);
}
@@ -484,6 +577,26 @@ static inline int is_promisc(u16 cdc_filter)
return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
}
+static void alloc_tx_buffer(struct eth_dev *dev)
+{
+ struct list_head *act;
+ struct usb_request *req;
+
+ dev->tx_req_bufsize = (dev->dl_max_pkts_per_xfer *
+ (dev->net->mtu
+ + sizeof(struct ethhdr)
+ /* size of rndis_packet_msg_type */
+ + 44
+ + 22));
+
+ list_for_each(act, &dev->tx_reqs) {
+ req = container_of(act, struct usb_request, list);
+ if (!req->buf)
+ req->buf = kmalloc(dev->tx_req_bufsize,
+ GFP_ATOMIC);
+ }
+}
+
static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
struct net_device *net)
{
@@ -510,6 +623,10 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
}
+ /* Allocate memory for tx_reqs to support multi packet transfer */
+ if (dev->port_usb->multi_pkt_xfer && !dev->tx_req_bufsize)
+ alloc_tx_buffer(dev);
+
/* apply outgoing CDC or RNDIS filters */
if (skb && !is_promisc(cdc_filter)) {
u8 *dest = skb->data;
@@ -572,9 +689,37 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
}
}
- length = skb->len;
- req->buf = skb->data;
- req->context = skb;
+ spin_lock_irqsave(&dev->req_lock, flags);
+ dev->tx_skb_hold_count++;
+ spin_unlock_irqrestore(&dev->req_lock, flags);
+
+ if (dev->port_usb->multi_pkt_xfer) {
+ memcpy(req->buf + req->length, skb->data, skb->len);
+ req->length = req->length + skb->len;
+ length = req->length;
+ dev_kfree_skb_any(skb);
+
+ spin_lock_irqsave(&dev->req_lock, flags);
+ if (dev->tx_skb_hold_count < dev->dl_max_pkts_per_xfer) {
+ if (dev->no_tx_req_used > TX_REQ_THRESHOLD) {
+ list_add(&req->list, &dev->tx_reqs);
+ spin_unlock_irqrestore(&dev->req_lock, flags);
+ goto success;
+ }
+ }
+
+ dev->no_tx_req_used++;
+ spin_unlock_irqrestore(&dev->req_lock, flags);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ dev->tx_skb_hold_count = 0;
+ spin_unlock_irqrestore(&dev->lock, flags);
+ } else {
+ length = skb->len;
+ req->buf = skb->data;
+ req->context = skb;
+ }
+
req->complete = tx_complete;
/* NCM requires no zlp if transfer is dwNtbInMaxSize */
@@ -589,11 +734,28 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
* though any robust network rx path ignores extra padding.
* and some hardware doesn't like to write zlps.
*/
- if (req->zero && !dev->zlp && (length % in->maxpacket) == 0)
+ if (req->zero && !dev->zlp && (length % in->maxpacket) == 0) {
+ req->zero = 0;
length++;
+ }
req->length = length;
+ /* throttle highspeed IRQ rate back slightly */
+ if (gadget_is_dualspeed(dev->gadget) &&
+ (dev->gadget->speed == USB_SPEED_HIGH) &&
+ !list_empty(&dev->tx_reqs)) {
+ dev->tx_qlen++;
+ if (dev->tx_qlen == (dev->qmult/2)) {
+ req->no_interrupt = 0;
+ dev->tx_qlen = 0;
+ } else {
+ req->no_interrupt = 1;
+ }
+ } else {
+ req->no_interrupt = 0;
+ }
+
retval = usb_ep_queue(in, req, GFP_ATOMIC);
switch (retval) {
default:
@@ -601,11 +763,11 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
break;
case 0:
net->trans_start = jiffies;
- atomic_inc(&dev->tx_qlen);
}
if (retval) {
- dev_kfree_skb_any(skb);
+ if (!dev->port_usb->multi_pkt_xfer)
+ dev_kfree_skb_any(skb);
drop:
dev->net->stats.tx_dropped++;
multiframe:
@@ -615,6 +777,7 @@ multiframe:
list_add(&req->list, &dev->tx_reqs);
spin_unlock_irqrestore(&dev->req_lock, flags);
}
+success:
return NETDEV_TX_OK;
}
@@ -628,7 +791,7 @@ static void eth_start(struct eth_dev *dev, gfp_t gfp_flags)
rx_fill(dev, gfp_flags);
/* and open the tx floodgates */
- atomic_set(&dev->tx_qlen, 0);
+ dev->tx_qlen = 0;
netif_wake_queue(dev->net);
}
@@ -774,6 +937,7 @@ struct eth_dev *gether_setup_name(struct usb_gadget *g,
spin_lock_init(&dev->lock);
spin_lock_init(&dev->req_lock);
INIT_WORK(&dev->work, eth_work);
+ INIT_WORK(&dev->rx_work, process_rx_w);
INIT_LIST_HEAD(&dev->tx_reqs);
INIT_LIST_HEAD(&dev->rx_reqs);
@@ -836,6 +1000,7 @@ struct net_device *gether_setup_name_default(const char *netname)
spin_lock_init(&dev->lock);
spin_lock_init(&dev->req_lock);
INIT_WORK(&dev->work, eth_work);
+ INIT_WORK(&dev->rx_work, process_rx_w);
INIT_LIST_HEAD(&dev->tx_reqs);
INIT_LIST_HEAD(&dev->rx_reqs);
@@ -1070,8 +1235,13 @@ struct net_device *gether_connect(struct gether *link)
dev->header_len = link->header_len;
dev->unwrap = link->unwrap;
dev->wrap = link->wrap;
+ dev->ul_max_pkts_per_xfer = link->ul_max_pkts_per_xfer;
+ dev->dl_max_pkts_per_xfer = link->dl_max_pkts_per_xfer;
spin_lock(&dev->lock);
+ dev->tx_skb_hold_count = 0;
+ dev->no_tx_req_used = 0;
+ dev->tx_req_bufsize = 0;
dev->port_usb = link;
if (netif_running(dev->net)) {
if (link->open)
@@ -1116,6 +1286,7 @@ void gether_disconnect(struct gether *link)
{
struct eth_dev *dev = link->ioport;
struct usb_request *req;
+ struct sk_buff *skb;
WARN_ON(!dev);
if (!dev)
@@ -1138,6 +1309,8 @@ void gether_disconnect(struct gether *link)
list_del(&req->list);
spin_unlock(&dev->req_lock);
+ if (link->multi_pkt_xfer)
+ kfree(req->buf);
usb_ep_free_request(link->in_ep, req);
spin_lock(&dev->req_lock);
}
@@ -1156,6 +1329,12 @@ void gether_disconnect(struct gether *link)
spin_lock(&dev->req_lock);
}
spin_unlock(&dev->req_lock);
+
+ spin_lock(&dev->rx_frames.lock);
+ while ((skb = __skb_dequeue(&dev->rx_frames)))
+ dev_kfree_skb_any(skb);
+ spin_unlock(&dev->rx_frames.lock);
+
link->out_ep->desc = NULL;
/* finish forgetting about this USB link episode */
@@ -1169,5 +1348,23 @@ void gether_disconnect(struct gether *link)
}
EXPORT_SYMBOL_GPL(gether_disconnect);
-MODULE_LICENSE("GPL");
+static int __init gether_init(void)
+{
+ uether_wq = create_singlethread_workqueue("uether");
+ if (!uether_wq) {
+ pr_err("%s: Unable to create workqueue: uether\n", __func__);
+ return -ENOMEM;
+ }
+ return 0;
+}
+module_init(gether_init);
+
+static void __exit gether_exit(void)
+{
+ destroy_workqueue(uether_wq);
+
+}
+module_exit(gether_exit);
MODULE_AUTHOR("David Brownell");
+MODULE_DESCRIPTION("ethernet over USB driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/usb/gadget/function/u_ether.h b/drivers/usb/gadget/function/u_ether.h
index c77145bd6b5b..e9fd14b46102 100644
--- a/drivers/usb/gadget/function/u_ether.h
+++ b/drivers/usb/gadget/function/u_ether.h
@@ -73,6 +73,9 @@ struct gether {
bool is_fixed;
u32 fixed_out_len;
u32 fixed_in_len;
+ unsigned ul_max_pkts_per_xfer;
+ unsigned dl_max_pkts_per_xfer;
+ bool multi_pkt_xfer;
bool supports_multi_frame;
struct sk_buff *(*wrap)(struct gether *port,
struct sk_buff *skb);
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 22e8ecb6bfbd..795485eac7b0 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -6,6 +6,14 @@ menu "USB Physical Layer drivers"
config USB_PHY
def_bool n
+config USB_OTG_WAKELOCK
+ bool "Hold a wakelock when USB connected"
+ depends on WAKELOCK
+ select USB_OTG_UTILS
+ help
+ Select this to automatically hold a wakelock when USB is
+ connected, preventing suspend.
+
#
# USB Transceiver Drivers
#
@@ -213,4 +221,13 @@ config USB_ULPI_VIEWPORT
Provides read/write operations to the ULPI phy register set for
controllers with a viewport register (e.g. Chipidea/ARC controllers).
+config DUAL_ROLE_USB_INTF
+ bool "Generic DUAL ROLE sysfs interface"
+ depends on SYSFS && USB_PHY
+ help
+ A generic sysfs interface to track and change the state of
+ dual role usb phys. The usb phy drivers can register to
+ this interface to expose it capabilities to the userspace
+ and thereby allowing userspace to change the port mode.
+
endmenu
diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
index 19c0dccbb116..f7543f3b9943 100644
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -3,6 +3,8 @@
#
obj-$(CONFIG_USB_PHY) += phy.o
obj-$(CONFIG_OF) += of.o
+obj-$(CONFIG_USB_OTG_WAKELOCK) += otg-wakelock.o
+obj-$(CONFIG_DUAL_ROLE_USB_INTF) += class-dual-role.o
# transceiver drivers, keep the list sorted
diff --git a/drivers/usb/phy/class-dual-role.c b/drivers/usb/phy/class-dual-role.c
new file mode 100644
index 000000000000..51fcb545a9d5
--- /dev/null
+++ b/drivers/usb/phy/class-dual-role.c
@@ -0,0 +1,529 @@
+/*
+ * class-dual-role.c
+ *
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/usb/class-dual-role.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/types.h>
+
+#define DUAL_ROLE_NOTIFICATION_TIMEOUT 2000
+
+static ssize_t dual_role_store_property(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t dual_role_show_property(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+
+#define DUAL_ROLE_ATTR(_name) \
+{ \
+ .attr = { .name = #_name }, \
+ .show = dual_role_show_property, \
+ .store = dual_role_store_property, \
+}
+
+static struct device_attribute dual_role_attrs[] = {
+ DUAL_ROLE_ATTR(supported_modes),
+ DUAL_ROLE_ATTR(mode),
+ DUAL_ROLE_ATTR(power_role),
+ DUAL_ROLE_ATTR(data_role),
+ DUAL_ROLE_ATTR(powers_vconn),
+};
+
+struct class *dual_role_class;
+EXPORT_SYMBOL_GPL(dual_role_class);
+
+static struct device_type dual_role_dev_type;
+
+static char *kstrdupcase(const char *str, gfp_t gfp, bool to_upper)
+{
+ char *ret, *ustr;
+
+ ustr = ret = kmalloc(strlen(str) + 1, gfp);
+
+ if (!ret)
+ return NULL;
+
+ while (*str)
+ *ustr++ = to_upper ? toupper(*str++) : tolower(*str++);
+
+ *ustr = 0;
+
+ return ret;
+}
+
+static void dual_role_changed_work(struct work_struct *work)
+{
+ struct dual_role_phy_instance *dual_role =
+ container_of(work, struct dual_role_phy_instance,
+ changed_work);
+
+ dev_dbg(&dual_role->dev, "%s\n", __func__);
+ kobject_uevent(&dual_role->dev.kobj, KOBJ_CHANGE);
+}
+
+void dual_role_instance_changed(struct dual_role_phy_instance *dual_role)
+{
+ dev_dbg(&dual_role->dev, "%s\n", __func__);
+ pm_wakeup_event(&dual_role->dev, DUAL_ROLE_NOTIFICATION_TIMEOUT);
+ schedule_work(&dual_role->changed_work);
+}
+EXPORT_SYMBOL_GPL(dual_role_instance_changed);
+
+int dual_role_get_property(struct dual_role_phy_instance *dual_role,
+ enum dual_role_property prop,
+ unsigned int *val)
+{
+ return dual_role->desc->get_property(dual_role, prop, val);
+}
+EXPORT_SYMBOL_GPL(dual_role_get_property);
+
+int dual_role_set_property(struct dual_role_phy_instance *dual_role,
+ enum dual_role_property prop,
+ const unsigned int *val)
+{
+ if (!dual_role->desc->set_property)
+ return -ENODEV;
+
+ return dual_role->desc->set_property(dual_role, prop, val);
+}
+EXPORT_SYMBOL_GPL(dual_role_set_property);
+
+int dual_role_property_is_writeable(struct dual_role_phy_instance *dual_role,
+ enum dual_role_property prop)
+{
+ if (!dual_role->desc->property_is_writeable)
+ return -ENODEV;
+
+ return dual_role->desc->property_is_writeable(dual_role, prop);
+}
+EXPORT_SYMBOL_GPL(dual_role_property_is_writeable);
+
+static void dual_role_dev_release(struct device *dev)
+{
+ struct dual_role_phy_instance *dual_role =
+ container_of(dev, struct dual_role_phy_instance, dev);
+ pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
+ kfree(dual_role);
+}
+
+static struct dual_role_phy_instance *__must_check
+__dual_role_register(struct device *parent,
+ const struct dual_role_phy_desc *desc)
+{
+ struct device *dev;
+ struct dual_role_phy_instance *dual_role;
+ int rc;
+
+ dual_role = kzalloc(sizeof(*dual_role), GFP_KERNEL);
+ if (!dual_role)
+ return ERR_PTR(-ENOMEM);
+
+ dev = &dual_role->dev;
+
+ device_initialize(dev);
+
+ dev->class = dual_role_class;
+ dev->type = &dual_role_dev_type;
+ dev->parent = parent;
+ dev->release = dual_role_dev_release;
+ dev_set_drvdata(dev, dual_role);
+ dual_role->desc = desc;
+
+ rc = dev_set_name(dev, "%s", desc->name);
+ if (rc)
+ goto dev_set_name_failed;
+
+ INIT_WORK(&dual_role->changed_work, dual_role_changed_work);
+
+ rc = device_init_wakeup(dev, true);
+ if (rc)
+ goto wakeup_init_failed;
+
+ rc = device_add(dev);
+ if (rc)
+ goto device_add_failed;
+
+ dual_role_instance_changed(dual_role);
+
+ return dual_role;
+
+device_add_failed:
+ device_init_wakeup(dev, false);
+wakeup_init_failed:
+dev_set_name_failed:
+ put_device(dev);
+ kfree(dual_role);
+
+ return ERR_PTR(rc);
+}
+
+static void dual_role_instance_unregister(struct dual_role_phy_instance
+ *dual_role)
+{
+ cancel_work_sync(&dual_role->changed_work);
+ device_init_wakeup(&dual_role->dev, false);
+ device_unregister(&dual_role->dev);
+}
+
+static void devm_dual_role_release(struct device *dev, void *res)
+{
+ struct dual_role_phy_instance **dual_role = res;
+
+ dual_role_instance_unregister(*dual_role);
+}
+
+struct dual_role_phy_instance *__must_check
+devm_dual_role_instance_register(struct device *parent,
+ const struct dual_role_phy_desc *desc)
+{
+ struct dual_role_phy_instance **ptr, *dual_role;
+
+ ptr = devres_alloc(devm_dual_role_release, sizeof(*ptr), GFP_KERNEL);
+
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+ dual_role = __dual_role_register(parent, desc);
+ if (IS_ERR(dual_role)) {
+ devres_free(ptr);
+ } else {
+ *ptr = dual_role;
+ devres_add(parent, ptr);
+ }
+ return dual_role;
+}
+EXPORT_SYMBOL_GPL(devm_dual_role_instance_register);
+
+static int devm_dual_role_match(struct device *dev, void *res, void *data)
+{
+ struct dual_role_phy_instance **r = res;
+
+ if (WARN_ON(!r || !*r))
+ return 0;
+
+ return *r == data;
+}
+
+void devm_dual_role_instance_unregister(struct device *dev,
+ struct dual_role_phy_instance
+ *dual_role)
+{
+ int rc;
+
+ rc = devres_release(dev, devm_dual_role_release,
+ devm_dual_role_match, dual_role);
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_dual_role_instance_unregister);
+
+void *dual_role_get_drvdata(struct dual_role_phy_instance *dual_role)
+{
+ return dual_role->drv_data;
+}
+EXPORT_SYMBOL_GPL(dual_role_get_drvdata);
+
+/***************** Device attribute functions **************************/
+
+/* port type */
+static char *supported_modes_text[] = {
+ "ufp dfp", "dfp", "ufp"
+};
+
+/* current mode */
+static char *mode_text[] = {
+ "ufp", "dfp", "none"
+};
+
+/* Power role */
+static char *pr_text[] = {
+ "source", "sink", "none"
+};
+
+/* Data role */
+static char *dr_text[] = {
+ "host", "device", "none"
+};
+
+/* Vconn supply */
+static char *vconn_supply_text[] = {
+ "n", "y"
+};
+
+static ssize_t dual_role_show_property(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ ssize_t ret = 0;
+ struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev);
+ const ptrdiff_t off = attr - dual_role_attrs;
+ unsigned int value;
+
+ if (off == DUAL_ROLE_PROP_SUPPORTED_MODES) {
+ value = dual_role->desc->supported_modes;
+ } else {
+ ret = dual_role_get_property(dual_role, off, &value);
+
+ if (ret < 0) {
+ if (ret == -ENODATA)
+ dev_dbg(dev,
+ "driver has no data for `%s' property\n",
+ attr->attr.name);
+ else if (ret != -ENODEV)
+ dev_err(dev,
+ "driver failed to report `%s' property: %zd\n",
+ attr->attr.name, ret);
+ return ret;
+ }
+ }
+
+ if (off == DUAL_ROLE_PROP_SUPPORTED_MODES) {
+ BUILD_BUG_ON(DUAL_ROLE_PROP_SUPPORTED_MODES_TOTAL !=
+ ARRAY_SIZE(supported_modes_text));
+ if (value < DUAL_ROLE_PROP_SUPPORTED_MODES_TOTAL)
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ supported_modes_text[value]);
+ else
+ return -EIO;
+ } else if (off == DUAL_ROLE_PROP_MODE) {
+ BUILD_BUG_ON(DUAL_ROLE_PROP_MODE_TOTAL !=
+ ARRAY_SIZE(mode_text));
+ if (value < DUAL_ROLE_PROP_MODE_TOTAL)
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ mode_text[value]);
+ else
+ return -EIO;
+ } else if (off == DUAL_ROLE_PROP_PR) {
+ BUILD_BUG_ON(DUAL_ROLE_PROP_PR_TOTAL != ARRAY_SIZE(pr_text));
+ if (value < DUAL_ROLE_PROP_PR_TOTAL)
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ pr_text[value]);
+ else
+ return -EIO;
+ } else if (off == DUAL_ROLE_PROP_DR) {
+ BUILD_BUG_ON(DUAL_ROLE_PROP_DR_TOTAL != ARRAY_SIZE(dr_text));
+ if (value < DUAL_ROLE_PROP_DR_TOTAL)
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ dr_text[value]);
+ else
+ return -EIO;
+ } else if (off == DUAL_ROLE_PROP_VCONN_SUPPLY) {
+ BUILD_BUG_ON(DUAL_ROLE_PROP_VCONN_SUPPLY_TOTAL !=
+ ARRAY_SIZE(vconn_supply_text));
+ if (value < DUAL_ROLE_PROP_VCONN_SUPPLY_TOTAL)
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ vconn_supply_text[value]);
+ else
+ return -EIO;
+ } else
+ return -EIO;
+}
+
+static ssize_t dual_role_store_property(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ ssize_t ret;
+ struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev);
+ const ptrdiff_t off = attr - dual_role_attrs;
+ unsigned int value;
+ int total, i;
+ char *dup_buf, **text_array;
+ bool result = false;
+
+ dup_buf = kstrdupcase(buf, GFP_KERNEL, false);
+ switch (off) {
+ case DUAL_ROLE_PROP_MODE:
+ total = DUAL_ROLE_PROP_MODE_TOTAL;
+ text_array = mode_text;
+ break;
+ case DUAL_ROLE_PROP_PR:
+ total = DUAL_ROLE_PROP_PR_TOTAL;
+ text_array = pr_text;
+ break;
+ case DUAL_ROLE_PROP_DR:
+ total = DUAL_ROLE_PROP_DR_TOTAL;
+ text_array = dr_text;
+ break;
+ case DUAL_ROLE_PROP_VCONN_SUPPLY:
+ ret = strtobool(dup_buf, &result);
+ value = result;
+ if (!ret)
+ goto setprop;
+ default:
+ ret = -EINVAL;
+ goto error;
+ }
+
+ for (i = 0; i <= total; i++) {
+ if (i == total) {
+ ret = -ENOTSUPP;
+ goto error;
+ }
+ if (!strncmp(*(text_array + i), dup_buf,
+ strlen(*(text_array + i)))) {
+ value = i;
+ break;
+ }
+ }
+
+setprop:
+ ret = dual_role->desc->set_property(dual_role, off, &value);
+
+error:
+ kfree(dup_buf);
+
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static umode_t dual_role_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int attrno)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev);
+ umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
+ int i;
+
+ if (attrno == DUAL_ROLE_PROP_SUPPORTED_MODES)
+ return mode;
+
+ for (i = 0; i < dual_role->desc->num_properties; i++) {
+ int property = dual_role->desc->properties[i];
+
+ if (property == attrno) {
+ if (dual_role->desc->property_is_writeable &&
+ dual_role_property_is_writeable(dual_role, property)
+ > 0)
+ mode |= S_IWUSR;
+
+ return mode;
+ }
+ }
+
+ return 0;
+}
+
+static struct attribute *__dual_role_attrs[ARRAY_SIZE(dual_role_attrs) + 1];
+
+static struct attribute_group dual_role_attr_group = {
+ .attrs = __dual_role_attrs,
+ .is_visible = dual_role_attr_is_visible,
+};
+
+static const struct attribute_group *dual_role_attr_groups[] = {
+ &dual_role_attr_group,
+ NULL,
+};
+
+void dual_role_init_attrs(struct device_type *dev_type)
+{
+ int i;
+
+ dev_type->groups = dual_role_attr_groups;
+
+ for (i = 0; i < ARRAY_SIZE(dual_role_attrs); i++)
+ __dual_role_attrs[i] = &dual_role_attrs[i].attr;
+}
+
+int dual_role_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct dual_role_phy_instance *dual_role = dev_get_drvdata(dev);
+ int ret = 0, j;
+ char *prop_buf;
+ char *attrname;
+
+ dev_dbg(dev, "uevent\n");
+
+ if (!dual_role || !dual_role->desc) {
+ dev_dbg(dev, "No dual_role phy yet\n");
+ return ret;
+ }
+
+ dev_dbg(dev, "DUAL_ROLE_NAME=%s\n", dual_role->desc->name);
+
+ ret = add_uevent_var(env, "DUAL_ROLE_NAME=%s", dual_role->desc->name);
+ if (ret)
+ return ret;
+
+ prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
+ if (!prop_buf)
+ return -ENOMEM;
+
+ for (j = 0; j < dual_role->desc->num_properties; j++) {
+ struct device_attribute *attr;
+ char *line;
+
+ attr = &dual_role_attrs[dual_role->desc->properties[j]];
+
+ ret = dual_role_show_property(dev, attr, prop_buf);
+ if (ret == -ENODEV || ret == -ENODATA) {
+ ret = 0;
+ continue;
+ }
+
+ if (ret < 0)
+ goto out;
+ line = strnchr(prop_buf, PAGE_SIZE, '\n');
+ if (line)
+ *line = 0;
+
+ attrname = kstrdupcase(attr->attr.name, GFP_KERNEL, true);
+ if (!attrname)
+ ret = -ENOMEM;
+
+ dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
+
+ ret = add_uevent_var(env, "DUAL_ROLE_%s=%s", attrname,
+ prop_buf);
+ kfree(attrname);
+ if (ret)
+ goto out;
+ }
+
+out:
+ free_page((unsigned long)prop_buf);
+
+ return ret;
+}
+
+/******************* Module Init ***********************************/
+
+static int __init dual_role_class_init(void)
+{
+ dual_role_class = class_create(THIS_MODULE, "dual_role_usb");
+
+ if (IS_ERR(dual_role_class))
+ return PTR_ERR(dual_role_class);
+
+ dual_role_class->dev_uevent = dual_role_uevent;
+ dual_role_init_attrs(&dual_role_dev_type);
+
+ return 0;
+}
+
+static void __exit dual_role_class_exit(void)
+{
+ class_destroy(dual_role_class);
+}
+
+subsys_initcall(dual_role_class_init);
+module_exit(dual_role_class_exit);
diff --git a/drivers/usb/phy/otg-wakelock.c b/drivers/usb/phy/otg-wakelock.c
new file mode 100644
index 000000000000..479376bfa484
--- /dev/null
+++ b/drivers/usb/phy/otg-wakelock.c
@@ -0,0 +1,173 @@
+/*
+ * otg-wakelock.c
+ *
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/wakelock.h>
+#include <linux/spinlock.h>
+#include <linux/usb/otg.h>
+
+#define TEMPORARY_HOLD_TIME 2000
+
+static bool enabled = true;
+static struct usb_phy *otgwl_xceiv;
+static struct notifier_block otgwl_nb;
+
+/*
+ * otgwl_spinlock is held while the VBUS lock is grabbed or dropped and the
+ * held field is updated to match.
+ */
+
+static DEFINE_SPINLOCK(otgwl_spinlock);
+
+/*
+ * Only one lock, but since these 3 fields are associated with each other...
+ */
+
+struct otgwl_lock {
+ char name[40];
+ struct wake_lock wakelock;
+ bool held;
+};
+
+/*
+ * VBUS present lock. Also used as a timed lock on charger
+ * connect/disconnect and USB host disconnect, to allow the system
+ * to react to the change in power.
+ */
+
+static struct otgwl_lock vbus_lock;
+
+static void otgwl_hold(struct otgwl_lock *lock)
+{
+ if (!lock->held) {
+ wake_lock(&lock->wakelock);
+ lock->held = true;
+ }
+}
+
+static void otgwl_temporary_hold(struct otgwl_lock *lock)
+{
+ wake_lock_timeout(&lock->wakelock,
+ msecs_to_jiffies(TEMPORARY_HOLD_TIME));
+ lock->held = false;
+}
+
+static void otgwl_drop(struct otgwl_lock *lock)
+{
+ if (lock->held) {
+ wake_unlock(&lock->wakelock);
+ lock->held = false;
+ }
+}
+
+static void otgwl_handle_event(unsigned long event)
+{
+ unsigned long irqflags;
+
+ spin_lock_irqsave(&otgwl_spinlock, irqflags);
+
+ if (!enabled) {
+ otgwl_drop(&vbus_lock);
+ spin_unlock_irqrestore(&otgwl_spinlock, irqflags);
+ return;
+ }
+
+ switch (event) {
+ case USB_EVENT_VBUS:
+ case USB_EVENT_ENUMERATED:
+ otgwl_hold(&vbus_lock);
+ break;
+
+ case USB_EVENT_NONE:
+ case USB_EVENT_ID:
+ case USB_EVENT_CHARGER:
+ otgwl_temporary_hold(&vbus_lock);
+ break;
+
+ default:
+ break;
+ }
+
+ spin_unlock_irqrestore(&otgwl_spinlock, irqflags);
+}
+
+static int otgwl_otg_notifications(struct notifier_block *nb,
+ unsigned long event, void *unused)
+{
+ otgwl_handle_event(event);
+ return NOTIFY_OK;
+}
+
+static int set_enabled(const char *val, const struct kernel_param *kp)
+{
+ int rv = param_set_bool(val, kp);
+
+ if (rv)
+ return rv;
+
+ if (otgwl_xceiv)
+ otgwl_handle_event(otgwl_xceiv->last_event);
+
+ return 0;
+}
+
+static struct kernel_param_ops enabled_param_ops = {
+ .set = set_enabled,
+ .get = param_get_bool,
+};
+
+module_param_cb(enabled, &enabled_param_ops, &enabled, 0644);
+MODULE_PARM_DESC(enabled, "enable wakelock when VBUS present");
+
+static int __init otg_wakelock_init(void)
+{
+ int ret;
+ struct usb_phy *phy;
+
+ phy = usb_get_phy(USB_PHY_TYPE_USB2);
+
+ if (IS_ERR(phy)) {
+ pr_err("%s: No USB transceiver found\n", __func__);
+ return PTR_ERR(phy);
+ }
+ otgwl_xceiv = phy;
+
+ snprintf(vbus_lock.name, sizeof(vbus_lock.name), "vbus-%s",
+ dev_name(otgwl_xceiv->dev));
+ wake_lock_init(&vbus_lock.wakelock, WAKE_LOCK_SUSPEND,
+ vbus_lock.name);
+
+ otgwl_nb.notifier_call = otgwl_otg_notifications;
+ ret = usb_register_notifier(otgwl_xceiv, &otgwl_nb);
+
+ if (ret) {
+ pr_err("%s: usb_register_notifier on transceiver %s"
+ " failed\n", __func__,
+ dev_name(otgwl_xceiv->dev));
+ otgwl_xceiv = NULL;
+ wake_lock_destroy(&vbus_lock.wakelock);
+ return ret;
+ }
+
+ otgwl_handle_event(otgwl_xceiv->last_event);
+ return ret;
+}
+
+late_initcall(otg_wakelock_init);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-01 01:01:23 +0000