1 files changed, 483 insertions, 0 deletions
diff --git a/drivers/staging/usbip/stub_dev.c b/drivers/staging/usbip/stub_dev.c
new file mode 100644
index 000000000000..ee455a087eaf
--- /dev/null
+++ b/drivers/staging/usbip/stub_dev.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright (C) 2003-2008 Takahiro Hirofuchi
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+ * USA.
+ */
+
+#include "usbip_common.h"
+#include "stub.h"
+
+
+
+static int stub_probe(struct usb_interface *interface,
+				const struct usb_device_id *id);
+static void stub_disconnect(struct usb_interface *interface);
+
+
+/*
+ * Define device IDs here if you want to explicitly limit exportable devices.
+ * In the most cases, wild card matching will be ok because driver binding can
+ * be changed dynamically by a userland program.
+ */
+static struct usb_device_id stub_table[] = {
+#if 0
+	/* just an example */
+	{ USB_DEVICE(0x05ac, 0x0301) },   /* Mac 1 button mouse */
+	{ USB_DEVICE(0x0430, 0x0009) },   /* Plat Home Keyboard */
+	{ USB_DEVICE(0x059b, 0x0001) },   /* Iomega USB Zip 100 */
+	{ USB_DEVICE(0x04b3, 0x4427) },   /* IBM USB CD-ROM */
+	{ USB_DEVICE(0x05a9, 0xa511) },   /* LifeView USB cam */
+	{ USB_DEVICE(0x55aa, 0x0201) },   /* Imation card reader */
+	{ USB_DEVICE(0x046d, 0x0870) },   /* Qcam Express(QV-30) */
+	{ USB_DEVICE(0x04bb, 0x0101) },   /* IO-DATA HD 120GB */
+	{ USB_DEVICE(0x04bb, 0x0904) },   /* IO-DATA USB-ET/TX */
+	{ USB_DEVICE(0x04bb, 0x0201) },   /* IO-DATA USB-ET/TX */
+	{ USB_DEVICE(0x08bb, 0x2702) },   /* ONKYO USB Speaker */
+	{ USB_DEVICE(0x046d, 0x08b2) },   /* Logicool Qcam 4000 Pro */
+#endif
+	/* magic for wild card */
+	{ .driver_info = 1 },
+	{ 0, }                                     /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, stub_table);
+
+struct usb_driver stub_driver = {
+	.name		= "usbip",
+	.probe		= stub_probe,
+	.disconnect	= stub_disconnect,
+	.id_table	= stub_table,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Define sysfs entries for a usbip-bound device */
+
+
+/*
+ * usbip_status shows status of usbip as long as this driver is bound to the
+ * target device.
+ */
+static ssize_t show_status(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct stub_device *sdev = dev_get_drvdata(dev);
+	int status;
+
+	if (!sdev) {
+		dev_err(dev, "sdev is null\n");
+		return -ENODEV;
+	}
+
+	spin_lock(&sdev->ud.lock);
+	status = sdev->ud.status;
+	spin_unlock(&sdev->ud.lock);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", status);
+}
+static DEVICE_ATTR(usbip_status, S_IRUGO, show_status, NULL);
+
+/*
+ * usbip_sockfd gets a socket descriptor of an established TCP connection that
+ * is used to transfer usbip requests by kernel threads. -1 is a magic number
+ * by which usbip connection is finished.
+ */
+static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct stub_device *sdev = dev_get_drvdata(dev);
+	int sockfd = 0;
+	struct socket *socket;
+
+	if (!sdev) {
+		dev_err(dev, "sdev is null\n");
+		return -ENODEV;
+	}
+
+	sscanf(buf, "%d", &sockfd);
+
+	if (sockfd != -1) {
+		dev_info(dev, "stub up\n");
+
+		spin_lock(&sdev->ud.lock);
+
+		if (sdev->ud.status != SDEV_ST_AVAILABLE) {
+			dev_err(dev, "not ready\n");
+			spin_unlock(&sdev->ud.lock);
+			return -EINVAL;
+		}
+
+		socket = sockfd_to_socket(sockfd);
+		if (!socket) {
+			spin_unlock(&sdev->ud.lock);
+			return -EINVAL;
+		}
+
+#if 0
+		setnodelay(socket);
+		setkeepalive(socket);
+		setreuse(socket);
+#endif
+
+		sdev->ud.tcp_socket = socket;
+
+		spin_unlock(&sdev->ud.lock);
+
+		usbip_start_threads(&sdev->ud);
+
+		spin_lock(&sdev->ud.lock);
+		sdev->ud.status = SDEV_ST_USED;
+		spin_unlock(&sdev->ud.lock);
+
+	} else {
+		dev_info(dev, "stub down\n");
+
+		spin_lock(&sdev->ud.lock);
+		if (sdev->ud.status != SDEV_ST_USED) {
+			spin_unlock(&sdev->ud.lock);
+			return -EINVAL;
+		}
+		spin_unlock(&sdev->ud.lock);
+
+		usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN);
+	}
+
+	return count;
+}
+static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
+
+static int stub_add_files(struct device *dev)
+{
+	int err = 0;
+
+	err = device_create_file(dev, &dev_attr_usbip_status);
+	if (err)
+		goto err_status;
+
+	err = device_create_file(dev, &dev_attr_usbip_sockfd);
+	if (err)
+		goto err_sockfd;
+
+	err = device_create_file(dev, &dev_attr_usbip_debug);
+	if (err)
+		goto err_debug;
+
+	return 0;
+
+err_debug:
+	device_remove_file(dev, &dev_attr_usbip_sockfd);
+
+err_sockfd:
+	device_remove_file(dev, &dev_attr_usbip_status);
+
+err_status:
+	return err;
+}
+
+static void stub_remove_files(struct device *dev)
+{
+	device_remove_file(dev, &dev_attr_usbip_status);
+	device_remove_file(dev, &dev_attr_usbip_sockfd);
+	device_remove_file(dev, &dev_attr_usbip_debug);
+}
+
+
+
+/*-------------------------------------------------------------------------*/
+
+/* Event handler functions called by an event handler thread */
+
+static void stub_shutdown_connection(struct usbip_device *ud)
+{
+	struct stub_device *sdev = container_of(ud, struct stub_device, ud);
+
+	/*
+	 * When removing an exported device, kernel panic sometimes occurred
+	 * and then EIP was sk_wait_data of stub_rx thread. Is this because
+	 * sk_wait_data returned though stub_rx thread was already finished by
+	 * step 1?
+	 */
+	if (ud->tcp_socket) {
+		udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
+		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
+	}
+
+	/* 1. stop threads */
+	usbip_stop_threads(ud);
+
+	/* 2. close the socket */
+	/*
+	 * tcp_socket is freed after threads are killed.
+	 * So usbip_xmit do not touch NULL socket.
+	 */
+	if (ud->tcp_socket) {
+		sock_release(ud->tcp_socket);
+		ud->tcp_socket = NULL;
+	}
+
+	/* 3. free used data */
+	stub_device_cleanup_urbs(sdev);
+
+	/* 4. free stub_unlink */
+	{
+		unsigned long flags;
+		struct stub_unlink *unlink, *tmp;
+
+		spin_lock_irqsave(&sdev->priv_lock, flags);
+
+		list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) {
+			list_del(&unlink->list);
+			kfree(unlink);
+		}
+
+		list_for_each_entry_safe(unlink, tmp,
+						 &sdev->unlink_free, list) {
+			list_del(&unlink->list);
+			kfree(unlink);
+		}
+
+		spin_unlock_irqrestore(&sdev->priv_lock, flags);
+	}
+}
+
+static void stub_device_reset(struct usbip_device *ud)
+{
+	struct stub_device *sdev = container_of(ud, struct stub_device, ud);
+	struct usb_device *udev = interface_to_usbdev(sdev->interface);
+	int ret;
+
+	udbg("device reset");
+	ret = usb_lock_device_for_reset(udev, sdev->interface);
+	if (ret < 0) {
+		dev_err(&udev->dev, "lock for reset\n");
+
+		spin_lock(&ud->lock);
+		ud->status = SDEV_ST_ERROR;
+		spin_unlock(&ud->lock);
+
+		return;
+	}
+
+	/* try to reset the device */
+	ret = usb_reset_device(udev);
+
+	usb_unlock_device(udev);
+
+	spin_lock(&ud->lock);
+	if (ret) {
+		dev_err(&udev->dev, "device reset\n");
+		ud->status = SDEV_ST_ERROR;
+
+	} else {
+		dev_info(&udev->dev, "device reset\n");
+		ud->status = SDEV_ST_AVAILABLE;
+
+	}
+	spin_unlock(&ud->lock);
+
+	return;
+}
+
+static void stub_device_unusable(struct usbip_device *ud)
+{
+	spin_lock(&ud->lock);
+	ud->status = SDEV_ST_ERROR;
+	spin_unlock(&ud->lock);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/**
+ * stub_device_alloc - allocate a new stub_device struct
+ * @interface: usb_interface of a new device
+ *
+ * Allocates and initializes a new stub_device struct.
+ */
+static struct stub_device *stub_device_alloc(struct usb_interface *interface)
+{
+	struct stub_device *sdev;
+	int busnum = interface_to_busnum(interface);
+	int devnum = interface_to_devnum(interface);
+
+	dev_dbg(&interface->dev, "allocating stub device");
+
+	/* yes, it's a new device */
+	sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL);
+	if (!sdev) {
+		dev_err(&interface->dev, "no memory for stub_device\n");
+		return NULL;
+	}
+
+	sdev->interface = interface;
+
+	/*
+	 * devid is defined with devnum when this driver is first allocated.
+	 * devnum may change later if a device is reset. However, devid never
+	 * changes during a usbip connection.
+	 */
+	sdev->devid     = (busnum << 16) | devnum;
+
+	usbip_task_init(&sdev->ud.tcp_rx, "stub_rx", stub_rx_loop);
+	usbip_task_init(&sdev->ud.tcp_tx, "stub_tx", stub_tx_loop);
+
+	sdev->ud.side = USBIP_STUB;
+	sdev->ud.status = SDEV_ST_AVAILABLE;
+	/* sdev->ud.lock = SPIN_LOCK_UNLOCKED; */
+	spin_lock_init(&sdev->ud.lock);
+	sdev->ud.tcp_socket = NULL;
+
+	INIT_LIST_HEAD(&sdev->priv_init);
+	INIT_LIST_HEAD(&sdev->priv_tx);
+	INIT_LIST_HEAD(&sdev->priv_free);
+	INIT_LIST_HEAD(&sdev->unlink_free);
+	INIT_LIST_HEAD(&sdev->unlink_tx);
+	/* sdev->priv_lock = SPIN_LOCK_UNLOCKED; */
+	spin_lock_init(&sdev->priv_lock);
+
+	init_waitqueue_head(&sdev->tx_waitq);
+
+	sdev->ud.eh_ops.shutdown = stub_shutdown_connection;
+	sdev->ud.eh_ops.reset    = stub_device_reset;
+	sdev->ud.eh_ops.unusable = stub_device_unusable;
+
+	usbip_start_eh(&sdev->ud);
+
+	udbg("register new interface\n");
+	return sdev;
+}
+
+static int stub_device_free(struct stub_device *sdev)
+{
+	if (!sdev)
+		return -EINVAL;
+
+	kfree(sdev);
+	udbg("kfree udev ok\n");
+
+	return 0;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * If a usb device has multiple active interfaces, this driver is bound to all
+ * the active interfaces. However, usbip exports *a* usb device (i.e., not *an*
+ * active interface). Currently, a userland program must ensure that it
+ * looks at the usbip's sysfs entries of only the first active interface.
+ *
+ * TODO: use "struct usb_device_driver" to bind a usb device.
+ * However, it seems it is not fully supported in mainline kernel yet
+ * (2.6.19.2).
+ */
+static int stub_probe(struct usb_interface *interface,
+		      const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct stub_device *sdev = NULL;
+	char *udev_busid = interface->dev.parent->bus_id;
+	int err = 0;
+
+	dev_dbg(&interface->dev, "Enter\n");
+
+	/* check we should claim or not by busid_table */
+	if (match_busid(udev_busid)) {
+		dev_info(&interface->dev,
+			 "this device %s is not in match_busid table. skip!\n",
+			 udev_busid);
+
+		/*
+		 * Return value should be ENODEV or ENOXIO to continue trying
+		 * other matched drivers by the driver core.
+		 * See driver_probe_device() in driver/base/dd.c
+		 */
+		return -ENODEV;
+	}
+
+	if (udev->descriptor.bDeviceClass ==  USB_CLASS_HUB) {
+		udbg("this device %s is a usb hub device. skip!\n",
+								udev_busid);
+		return -ENODEV;
+	}
+
+	if (!strcmp(udev->bus->bus_name, "vhci_hcd")) {
+		udbg("this device %s is attached on vhci_hcd. skip!\n",
+								udev_busid);
+		return -ENODEV;
+	}
+
+	/* ok. this is my device. */
+	sdev = stub_device_alloc(interface);
+	if (!sdev)
+		return -ENOMEM;
+
+	dev_info(&interface->dev, "USB/IP Stub: register a new interface "
+		 "(bus %u dev %u ifn %u)\n", udev->bus->busnum, udev->devnum,
+		 interface->cur_altsetting->desc.bInterfaceNumber);
+
+	/* set private data to usb_interface */
+	usb_set_intfdata(interface, sdev);
+
+	err = stub_add_files(&interface->dev);
+	if (err) {
+		dev_err(&interface->dev, "create sysfs files for %s\n",
+			udev_busid);
+		return err;
+	}
+
+	return 0;
+}
+
+
+/*
+ * called in usb_disconnect() or usb_deregister()
+ * but only if actconfig(active configuration) exists
+ */
+static void stub_disconnect(struct usb_interface *interface)
+{
+	struct stub_device *sdev = usb_get_intfdata(interface);
+
+	udbg("Enter\n");
+
+	/* get stub_device */
+	if (!sdev) {
+		err(" could not get device from inteface data");
+		/* BUG(); */
+		return;
+	}
+
+	usb_set_intfdata(interface, NULL);
+
+
+	/*
+	 * NOTE:
+	 * rx/tx threads are invoked for each usb_device.
+	 */
+	stub_remove_files(&interface->dev);
+
+	/* 1. shutdown the current connection */
+	usbip_event_add(&sdev->ud, SDEV_EVENT_REMOVED);
+
+	/* 2. wait for the stop of the event handler */
+	usbip_stop_eh(&sdev->ud);
+
+	/* 3. free sdev */
+	stub_device_free(sdev);
+
+
+	udbg("bye\n");
+}