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authorChris Kelly <ckelly@ozmodevices.com>2012-02-20 21:11:53 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-02-24 09:26:51 -0800
commitae926051d7eb8f80dba9513db70d2e2fc8385d3a (patch)
treeb3ff68744d42b77076aaa8333ddf0e0a76d659fe /drivers/staging/ozwpan
parentbc3157dde35ac3b2ec12229edcfaca58cd7925c0 (diff)
downloadlinaro-lsk-ae926051d7eb8f80dba9513db70d2e2fc8385d3a.tar.gz
staging: ozwpan: Added USB HCD implementation
Added the implementation of the virtual USB HCD that is used to present devices connected via the network to the USB subsystem. Signed-off-by: Chris Kelly <ckelly@ozmodevices.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/ozwpan')
-rw-r--r--drivers/staging/ozwpan/ozhcd.c2257
-rw-r--r--drivers/staging/ozwpan/ozhcd.h15
2 files changed, 2272 insertions, 0 deletions
diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
new file mode 100644
index 00000000000..775dfe9c7b8
--- /dev/null
+++ b/drivers/staging/ozwpan/ozhcd.c
@@ -0,0 +1,2257 @@
+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ *
+ * This file provides the implementation of a USB host controller device that
+ * does not have any associated hardware. Instead the virtual device is
+ * connected to the WiFi network and emulates the operation of a USB hcd by
+ * receiving and sending network frames.
+ * Note:
+ * We take great pains to reduce the amount of code where interrupts need to be
+ * disabled and in this respect we are different from standard HCD's. In
+ * particular we don't want in_irq() code bleeding over to the protocol side of
+ * the driver.
+ * The troublesome functions are the urb enqueue and dequeue functions both of
+ * which can be called in_irq(). So for these functions we put the urbs into a
+ * queue and request a tasklet to process them. This means that a spinlock with
+ * interrupts disabled must be held for insertion and removal but most code is
+ * is in tasklet or soft irq context. The lock that protects this list is called
+ * the tasklet lock and serves the purpose of the 'HCD lock' which must be held
+ * when calling the following functions.
+ * usb_hcd_link_urb_to_ep()
+ * usb_hcd_unlink_urb_from_ep()
+ * usb_hcd_flush_endpoint()
+ * usb_hcd_check_unlink_urb()
+ * -----------------------------------------------------------------------------
+ */
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include "linux/usb/hcd.h"
+#include <asm/unaligned.h>
+#include "ozconfig.h"
+#include "ozusbif.h"
+#include "oztrace.h"
+#include "ozalloc.h"
+#include "ozurbparanoia.h"
+#include "ozevent.h"
+/*------------------------------------------------------------------------------
+ * Number of units of buffering to capture for an isochronous IN endpoint before
+ * allowing data to be indicated up.
+ */
+#define OZ_IN_BUFFERING_UNITS 50
+/* Name of our platform device.
+ */
+#define OZ_PLAT_DEV_NAME "ozwpan"
+/* Maximum number of free urb links that can be kept in the pool.
+ */
+#define OZ_MAX_LINK_POOL_SIZE 16
+/* Get endpoint object from the containing link.
+ */
+#define ep_from_link(__e) container_of((__e), struct oz_endpoint, link)
+/*------------------------------------------------------------------------------
+ * Used to link urbs together and also store some status information for each
+ * urb.
+ * A cache of these are kept in a pool to reduce number of calls to kmalloc.
+ */
+struct oz_urb_link {
+ struct list_head link;
+ struct urb *urb;
+ struct oz_port *port;
+ u8 req_id;
+ u8 ep_num;
+ unsigned long submit_jiffies;
+};
+
+/* Holds state information about a USB endpoint.
+ */
+struct oz_endpoint {
+ struct list_head urb_list; /* List of oz_urb_link items. */
+ struct list_head link; /* For isoc ep, links in to isoc
+ lists of oz_port. */
+ unsigned long last_jiffies;
+ int credit;
+ int credit_ceiling;
+ u8 ep_num;
+ u8 attrib;
+ u8 *buffer;
+ int buffer_size;
+ int in_ix;
+ int out_ix;
+ int buffered_units;
+ unsigned flags;
+ int start_frame;
+};
+/* Bits in the flags field. */
+#define OZ_F_EP_BUFFERING 0x1
+#define OZ_F_EP_HAVE_STREAM 0x2
+
+/* Holds state information about a USB interface.
+ */
+struct oz_interface {
+ unsigned ep_mask;
+ u8 alt;
+};
+
+/* Holds state information about an hcd port.
+ */
+#define OZ_NB_ENDPOINTS 16
+struct oz_port {
+ unsigned flags;
+ unsigned status;
+ void *hpd;
+ struct oz_hcd *ozhcd;
+ spinlock_t port_lock;
+ u8 bus_addr;
+ u8 next_req_id;
+ u8 config_num;
+ int num_iface;
+ struct oz_interface *iface;
+ struct oz_endpoint *out_ep[OZ_NB_ENDPOINTS];
+ struct oz_endpoint *in_ep[OZ_NB_ENDPOINTS];
+ struct list_head isoc_out_ep;
+ struct list_head isoc_in_ep;
+};
+#define OZ_PORT_F_PRESENT 0x1
+#define OZ_PORT_F_CHANGED 0x2
+#define OZ_PORT_F_DYING 0x4
+
+/* Data structure in the private context area of struct usb_hcd.
+ */
+#define OZ_NB_PORTS 8
+struct oz_hcd {
+ spinlock_t hcd_lock;
+ struct list_head urb_pending_list;
+ struct list_head urb_cancel_list;
+ struct list_head orphanage;
+ int conn_port; /* Port that is currently connecting, -1 if none.*/
+ struct oz_port ports[OZ_NB_PORTS];
+ uint flags;
+ struct usb_hcd *hcd;
+};
+/* Bits in flags field.
+ */
+#define OZ_HDC_F_SUSPENDED 0x1
+
+/*------------------------------------------------------------------------------
+ * Static function prototypes.
+ */
+static int oz_hcd_start(struct usb_hcd *hcd);
+static void oz_hcd_stop(struct usb_hcd *hcd);
+static void oz_hcd_shutdown(struct usb_hcd *hcd);
+static int oz_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags);
+static int oz_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
+static void oz_hcd_endpoint_disable(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep);
+static void oz_hcd_endpoint_reset(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep);
+static int oz_hcd_get_frame_number(struct usb_hcd *hcd);
+static int oz_hcd_hub_status_data(struct usb_hcd *hcd, char *buf);
+static int oz_hcd_hub_control(struct usb_hcd *hcd, u16 req_type, u16 wvalue,
+ u16 windex, char *buf, u16 wlength);
+static int oz_hcd_bus_suspend(struct usb_hcd *hcd);
+static int oz_hcd_bus_resume(struct usb_hcd *hcd);
+static int oz_plat_probe(struct platform_device *dev);
+static int oz_plat_remove(struct platform_device *dev);
+static void oz_plat_shutdown(struct platform_device *dev);
+static int oz_plat_suspend(struct platform_device *dev, pm_message_t msg);
+static int oz_plat_resume(struct platform_device *dev);
+static void oz_urb_process_tasklet(unsigned long unused);
+static int oz_build_endpoints_for_config(struct usb_hcd *hcd,
+ struct oz_port *port, struct usb_host_config *config,
+ gfp_t mem_flags);
+static void oz_clean_endpoints_for_config(struct usb_hcd *hcd,
+ struct oz_port *port);
+static int oz_build_endpoints_for_interface(struct usb_hcd *hcd,
+ struct oz_port *port,
+ struct usb_host_interface *intf, gfp_t mem_flags);
+static void oz_clean_endpoints_for_interface(struct usb_hcd *hcd,
+ struct oz_port *port, int if_ix);
+static void oz_process_ep0_urb(struct oz_hcd *ozhcd, struct urb *urb,
+ gfp_t mem_flags);
+static struct oz_urb_link *oz_remove_urb(struct oz_endpoint *ep,
+ struct urb *urb);
+static void oz_hcd_clear_orphanage(struct oz_hcd *ozhcd, int status);
+/*------------------------------------------------------------------------------
+ * Static external variables.
+ */
+static struct platform_device *g_plat_dev;
+static struct oz_hcd *g_ozhcd;
+static DEFINE_SPINLOCK(g_hcdlock); /* Guards g_ozhcd. */
+static const char g_hcd_name[] = "Ozmo WPAN";
+static struct list_head *g_link_pool;
+static int g_link_pool_size;
+static DEFINE_SPINLOCK(g_link_lock);
+static DEFINE_SPINLOCK(g_tasklet_lock);
+static struct tasklet_struct g_urb_process_tasklet;
+static struct tasklet_struct g_urb_cancel_tasklet;
+static atomic_t g_pending_urbs = ATOMIC_INIT(0);
+static const struct hc_driver g_oz_hc_drv = {
+ .description = g_hcd_name,
+ .product_desc = "Ozmo Devices WPAN",
+ .hcd_priv_size = sizeof(struct oz_hcd),
+ .flags = HCD_USB11,
+ .start = oz_hcd_start,
+ .stop = oz_hcd_stop,
+ .shutdown = oz_hcd_shutdown,
+ .urb_enqueue = oz_hcd_urb_enqueue,
+ .urb_dequeue = oz_hcd_urb_dequeue,
+ .endpoint_disable = oz_hcd_endpoint_disable,
+ .endpoint_reset = oz_hcd_endpoint_reset,
+ .get_frame_number = oz_hcd_get_frame_number,
+ .hub_status_data = oz_hcd_hub_status_data,
+ .hub_control = oz_hcd_hub_control,
+ .bus_suspend = oz_hcd_bus_suspend,
+ .bus_resume = oz_hcd_bus_resume,
+};
+
+static struct platform_driver g_oz_plat_drv = {
+ .probe = oz_plat_probe,
+ .remove = oz_plat_remove,
+ .shutdown = oz_plat_shutdown,
+ .suspend = oz_plat_suspend,
+ .resume = oz_plat_resume,
+ .driver = {
+ .name = OZ_PLAT_DEV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+/*------------------------------------------------------------------------------
+ * Gets our private context area (which is of type struct oz_hcd) from the
+ * usb_hcd structure.
+ * Context: any
+ */
+static inline struct oz_hcd *oz_hcd_private(struct usb_hcd *hcd)
+{
+ return (struct oz_hcd *)hcd->hcd_priv;
+}
+/*------------------------------------------------------------------------------
+ * Searches list of ports to find the index of the one with a specified USB
+ * bus address. If none of the ports has the bus address then the connection
+ * port is returned, if there is one or -1 otherwise.
+ * Context: any
+ */
+static int oz_get_port_from_addr(struct oz_hcd *ozhcd, u8 bus_addr)
+{
+ int i;
+ for (i = 0; i < OZ_NB_PORTS; i++) {
+ if (ozhcd->ports[i].bus_addr == bus_addr)
+ return i;
+ }
+ return ozhcd->conn_port;
+}
+/*------------------------------------------------------------------------------
+ * Allocates an urb link, first trying the pool but going to heap if empty.
+ * Context: any
+ */
+static struct oz_urb_link *oz_alloc_urb_link(void)
+{
+ struct oz_urb_link *urbl = 0;
+ unsigned long irq_state;
+ spin_lock_irqsave(&g_link_lock, irq_state);
+ if (g_link_pool) {
+ urbl = container_of(g_link_pool, struct oz_urb_link, link);
+ g_link_pool = urbl->link.next;
+ --g_link_pool_size;
+ }
+ spin_unlock_irqrestore(&g_link_lock, irq_state);
+ if (urbl == 0)
+ urbl = oz_alloc(sizeof(struct oz_urb_link), GFP_ATOMIC);
+ return urbl;
+}
+/*------------------------------------------------------------------------------
+ * Frees an urb link by putting it in the pool if there is enough space or
+ * deallocating it to heap otherwise.
+ * Context: any
+ */
+static void oz_free_urb_link(struct oz_urb_link *urbl)
+{
+ if (urbl) {
+ unsigned long irq_state;
+ spin_lock_irqsave(&g_link_lock, irq_state);
+ if (g_link_pool_size < OZ_MAX_LINK_POOL_SIZE) {
+ urbl->link.next = g_link_pool;
+ g_link_pool = &urbl->link;
+ urbl = 0;
+ g_link_pool_size++;
+ }
+ spin_unlock_irqrestore(&g_link_lock, irq_state);
+ if (urbl)
+ oz_free(urbl);
+ }
+}
+/*------------------------------------------------------------------------------
+ * Deallocates all the urb links in the pool.
+ * Context: unknown
+ */
+static void oz_empty_link_pool(void)
+{
+ struct list_head *e;
+ unsigned long irq_state;
+ spin_lock_irqsave(&g_link_lock, irq_state);
+ e = g_link_pool;
+ g_link_pool = 0;
+ g_link_pool_size = 0;
+ spin_unlock_irqrestore(&g_link_lock, irq_state);
+ while (e) {
+ struct oz_urb_link *urbl =
+ container_of(e, struct oz_urb_link, link);
+ e = e->next;
+ oz_free(urbl);
+ }
+}
+/*------------------------------------------------------------------------------
+ * Allocates endpoint structure and optionally a buffer. If a buffer is
+ * allocated it immediately follows the endpoint structure.
+ * Context: softirq
+ */
+static struct oz_endpoint *oz_ep_alloc(gfp_t mem_flags, int buffer_size)
+{
+ struct oz_endpoint *ep =
+ oz_alloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
+ if (ep) {
+ memset(ep, 0, sizeof(*ep));
+ INIT_LIST_HEAD(&ep->urb_list);
+ INIT_LIST_HEAD(&ep->link);
+ ep->credit = -1;
+ if (buffer_size) {
+ ep->buffer_size = buffer_size;
+ ep->buffer = (u8 *)(ep+1);
+ }
+ }
+ return ep;
+}
+/*------------------------------------------------------------------------------
+ * Pre-condition: Must be called with g_tasklet_lock held and interrupts
+ * disabled.
+ * Context: softirq or process
+ */
+struct oz_urb_link *oz_uncancel_urb(struct oz_hcd *ozhcd, struct urb *urb)
+{
+ struct oz_urb_link *urbl;
+ struct list_head *e;
+ list_for_each(e, &ozhcd->urb_cancel_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (urb == urbl->urb) {
+ list_del_init(e);
+ return urbl;
+ }
+ }
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * This is called when we have finished processing an urb. It unlinks it from
+ * the ep and returns it to the core.
+ * Context: softirq or process
+ */
+static void oz_complete_urb(struct usb_hcd *hcd, struct urb *urb,
+ int status, unsigned long submit_jiffies)
+{
+ struct oz_hcd *ozhcd = oz_hcd_private(hcd);
+ unsigned long irq_state;
+ struct oz_urb_link *cancel_urbl = 0;
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ usb_hcd_unlink_urb_from_ep(hcd, urb);
+ /* Clear hcpriv which will prevent it being put in the cancel list
+ * in the event that an attempt is made to cancel it.
+ */
+ urb->hcpriv = 0;
+ /* Walk the cancel list in case the urb is already sitting there.
+ * Since we process the cancel list in a tasklet rather than in
+ * the dequeue function this could happen.
+ */
+ cancel_urbl = oz_uncancel_urb(ozhcd, urb);
+ /* Note: we release lock but do not enable local irqs.
+ * It appears that usb_hcd_giveback_urb() expects irqs to be disabled,
+ * or at least other host controllers disable interrupts at this point
+ * so we do the same. We must, however, release the lock otherwise a
+ * deadlock will occur if an urb is submitted to our driver in the urb
+ * completion function. Because we disable interrupts it is possible
+ * that the urb_enqueue function can be called with them disabled.
+ */
+ spin_unlock(&g_tasklet_lock);
+ if (oz_forget_urb(urb)) {
+ oz_trace("OZWPAN: ERROR Unknown URB %p\n", urb);
+ } else {
+ static unsigned long last_time;
+ atomic_dec(&g_pending_urbs);
+ oz_trace2(OZ_TRACE_URB,
+ "%lu: giveback_urb(%p,%x) %lu %lu pending:%d\n",
+ jiffies, urb, status, jiffies-submit_jiffies,
+ jiffies-last_time, atomic_read(&g_pending_urbs));
+ last_time = jiffies;
+ oz_event_log(OZ_EVT_URB_DONE, 0, 0, urb, status);
+ usb_hcd_giveback_urb(hcd, urb, status);
+ }
+ spin_lock(&g_tasklet_lock);
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ if (cancel_urbl)
+ oz_free_urb_link(cancel_urbl);
+}
+/*------------------------------------------------------------------------------
+ * Deallocates an endpoint including deallocating any associated stream and
+ * returning any queued urbs to the core.
+ * Context: softirq
+ */
+static void oz_ep_free(struct oz_port *port, struct oz_endpoint *ep)
+{
+ oz_trace("oz_ep_free()\n");
+ if (port) {
+ struct list_head list;
+ struct oz_hcd *ozhcd = port->ozhcd;
+ INIT_LIST_HEAD(&list);
+ if (ep->flags & OZ_F_EP_HAVE_STREAM)
+ oz_usb_stream_delete(port->hpd, ep->ep_num);
+ /* Transfer URBs to the orphanage while we hold the lock. */
+ spin_lock_bh(&ozhcd->hcd_lock);
+ /* Note: this works even if ep->urb_list is empty.*/
+ list_replace_init(&ep->urb_list, &list);
+ /* Put the URBs in the orphanage. */
+ list_splice_tail(&list, &ozhcd->orphanage);
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ }
+ oz_trace("Freeing endpoint memory\n");
+ oz_free(ep);
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static int oz_enqueue_ep_urb(struct oz_port *port, u8 ep_addr, int in_dir,
+ struct urb *urb, u8 req_id)
+{
+ struct oz_urb_link *urbl;
+ struct oz_endpoint *ep;
+ int err = 0;
+ if (ep_addr >= OZ_NB_ENDPOINTS) {
+ oz_trace("Invalid endpoint number in oz_enqueue_ep_urb().\n");
+ return -EINVAL;
+ }
+ urbl = oz_alloc_urb_link();
+ if (!urbl)
+ return -ENOMEM;
+ urbl->submit_jiffies = jiffies;
+ urbl->urb = urb;
+ urbl->req_id = req_id;
+ urbl->ep_num = ep_addr;
+ /* Hold lock while we insert the URB into the list within the
+ * endpoint structure.
+ */
+ spin_lock_bh(&port->ozhcd->hcd_lock);
+ /* If the urb has been unlinked while out of any list then
+ * complete it now.
+ */
+ if (urb->unlinked) {
+ spin_unlock_bh(&port->ozhcd->hcd_lock);
+ oz_trace("urb %p unlinked so complete immediately\n", urb);
+ oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
+ oz_free_urb_link(urbl);
+ return 0;
+ }
+ if (in_dir)
+ ep = port->in_ep[ep_addr];
+ else
+ ep = port->out_ep[ep_addr];
+ if (ep && port->hpd) {
+ list_add_tail(&urbl->link, &ep->urb_list);
+ if (!in_dir && ep_addr && (ep->credit < 0)) {
+ ep->last_jiffies = jiffies;
+ ep->credit = 0;
+ oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num,
+ 0, 0, ep->credit);
+ }
+ } else {
+ err = -EPIPE;
+ }
+ spin_unlock_bh(&port->ozhcd->hcd_lock);
+ if (err)
+ oz_free_urb_link(urbl);
+ return err;
+}
+/*------------------------------------------------------------------------------
+ * Removes an urb from the queue in the endpoint.
+ * Returns 0 if it is found and -EIDRM otherwise.
+ * Context: softirq
+ */
+static int oz_dequeue_ep_urb(struct oz_port *port, u8 ep_addr, int in_dir,
+ struct urb *urb)
+{
+ struct oz_urb_link *urbl = 0;
+ struct oz_endpoint *ep;
+ spin_lock_bh(&port->ozhcd->hcd_lock);
+ if (in_dir)
+ ep = port->in_ep[ep_addr];
+ else
+ ep = port->out_ep[ep_addr];
+ if (ep) {
+ struct list_head *e;
+ list_for_each(e, &ep->urb_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (urbl->urb == urb) {
+ list_del_init(e);
+ break;
+ }
+ urbl = 0;
+ }
+ }
+ spin_unlock_bh(&port->ozhcd->hcd_lock);
+ if (urbl)
+ oz_free_urb_link(urbl);
+ return urbl ? 0 : -EIDRM;
+}
+/*------------------------------------------------------------------------------
+ * Finds an urb given its request id.
+ * Context: softirq
+ */
+static struct urb *oz_find_urb_by_id(struct oz_port *port, int ep_ix,
+ u8 req_id)
+{
+ struct oz_hcd *ozhcd = port->ozhcd;
+ struct urb *urb = 0;
+ struct oz_urb_link *urbl = 0;
+ struct oz_endpoint *ep;
+
+ spin_lock_bh(&ozhcd->hcd_lock);
+ ep = port->out_ep[ep_ix];
+ if (ep) {
+ struct list_head *e;
+ list_for_each(e, &ep->urb_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (urbl->req_id == req_id) {
+ urb = urbl->urb;
+ list_del_init(e);
+ break;
+ }
+ }
+ }
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ /* If urb is non-zero then we we must have an urb link to delete.
+ */
+ if (urb)
+ oz_free_urb_link(urbl);
+ return urb;
+}
+/*------------------------------------------------------------------------------
+ * Pre-condition: Port lock must be held.
+ * Context: softirq
+ */
+static void oz_acquire_port(struct oz_port *port, void *hpd)
+{
+ INIT_LIST_HEAD(&port->isoc_out_ep);
+ INIT_LIST_HEAD(&port->isoc_in_ep);
+ port->flags |= OZ_PORT_F_PRESENT | OZ_PORT_F_CHANGED;
+ port->status |= USB_PORT_STAT_CONNECTION |
+ (USB_PORT_STAT_C_CONNECTION << 16);
+ oz_usb_get(hpd);
+ port->hpd = hpd;
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static struct oz_hcd *oz_hcd_claim(void)
+{
+ struct oz_hcd *ozhcd;
+ spin_lock_bh(&g_hcdlock);
+ ozhcd = g_ozhcd;
+ if (ozhcd)
+ usb_get_hcd(ozhcd->hcd);
+ spin_unlock_bh(&g_hcdlock);
+ return ozhcd;
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static inline void oz_hcd_put(struct oz_hcd *ozhcd)
+{
+ if (ozhcd)
+ usb_put_hcd(ozhcd->hcd);
+}
+/*------------------------------------------------------------------------------
+ * This is called by the protocol handler to notify that a PD has arrived.
+ * We allocate a port to associate with the PD and create a structure for
+ * endpoint 0. This port is made the connection port.
+ * In the event that one of the other port is already a connection port then
+ * we fail.
+ * TODO We should be able to do better than fail and should be able remember
+ * that this port needs configuring and make it the connection port once the
+ * current connection port has been assigned an address. Collisions here are
+ * probably very rare indeed.
+ * Context: softirq
+ */
+void *oz_hcd_pd_arrived(void *hpd)
+{
+ int i;
+ void *hport = 0;
+ struct oz_hcd *ozhcd = 0;
+ struct oz_endpoint *ep;
+ oz_trace("oz_hcd_pd_arrived()\n");
+ ozhcd = oz_hcd_claim();
+ if (ozhcd == 0)
+ return 0;
+ /* Allocate an endpoint object in advance (before holding hcd lock) to
+ * use for out endpoint 0.
+ */
+ ep = oz_ep_alloc(GFP_ATOMIC, 0);
+ spin_lock_bh(&ozhcd->hcd_lock);
+ if (ozhcd->conn_port >= 0) {
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ oz_trace("conn_port >= 0\n");
+ goto out;
+ }
+ for (i = 0; i < OZ_NB_PORTS; i++) {
+ struct oz_port *port = &ozhcd->ports[i];
+ spin_lock(&port->port_lock);
+ if ((port->flags & OZ_PORT_F_PRESENT) == 0) {
+ oz_acquire_port(port, hpd);
+ spin_unlock(&port->port_lock);
+ break;
+ }
+ spin_unlock(&port->port_lock);
+ }
+ if (i < OZ_NB_PORTS) {
+ oz_trace("Setting conn_port = %d\n", i);
+ ozhcd->conn_port = i;
+ /* Attach out endpoint 0.
+ */
+ ozhcd->ports[i].out_ep[0] = ep;
+ ep = 0;
+ hport = &ozhcd->ports[i];
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ if (ozhcd->flags & OZ_HDC_F_SUSPENDED) {
+ oz_trace("Resuming root hub\n");
+ usb_hcd_resume_root_hub(ozhcd->hcd);
+ }
+ usb_hcd_poll_rh_status(ozhcd->hcd);
+ } else {
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ }
+out:
+ if (ep) /* ep is non-null if not used. */
+ oz_ep_free(0, ep);
+ oz_hcd_put(ozhcd);
+ return hport;
+}
+/*------------------------------------------------------------------------------
+ * This is called by the protocol handler to notify that the PD has gone away.
+ * We need to deallocate all resources and then request that the root hub is
+ * polled. We release the reference we hold on the PD.
+ * Context: softirq
+ */
+void oz_hcd_pd_departed(void *hport)
+{
+ struct oz_port *port = (struct oz_port *)hport;
+ struct oz_hcd *ozhcd;
+ void *hpd;
+ struct oz_endpoint *ep = 0;
+
+ oz_trace("oz_hcd_pd_departed()\n");
+ if (port == 0) {
+ oz_trace("oz_hcd_pd_departed() port = 0\n");
+ return;
+ }
+ ozhcd = port->ozhcd;
+ if (ozhcd == 0)
+ return;
+ /* Check if this is the connection port - if so clear it.
+ */
+ spin_lock_bh(&ozhcd->hcd_lock);
+ if ((ozhcd->conn_port >= 0) &&
+ (port == &ozhcd->ports[ozhcd->conn_port])) {
+ oz_trace("Clearing conn_port\n");
+ ozhcd->conn_port = -1;
+ }
+ spin_lock(&port->port_lock);
+ port->flags |= OZ_PORT_F_DYING;
+ spin_unlock(&port->port_lock);
+ spin_unlock_bh(&ozhcd->hcd_lock);
+
+ oz_clean_endpoints_for_config(ozhcd->hcd, port);
+ spin_lock_bh(&port->port_lock);
+ hpd = port->hpd;
+ port->hpd = 0;
+ port->bus_addr = 0xff;
+ port->flags &= ~(OZ_PORT_F_PRESENT | OZ_PORT_F_DYING);
+ port->flags |= OZ_PORT_F_CHANGED;
+ port->status &= ~USB_PORT_STAT_CONNECTION;
+ port->status |= (USB_PORT_STAT_C_CONNECTION << 16);
+ /* If there is an endpont 0 then clear the pointer while we hold
+ * the spinlock be we deallocate it after releasing the lock.
+ */
+ if (port->out_ep[0]) {
+ ep = port->out_ep[0];
+ port->out_ep[0] = 0;
+ }
+ spin_unlock_bh(&port->port_lock);
+ if (ep)
+ oz_ep_free(port, ep);
+ usb_hcd_poll_rh_status(ozhcd->hcd);
+ oz_usb_put(hpd);
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+void oz_hcd_pd_reset(void *hpd, void *hport)
+{
+ /* Cleanup the current configuration and report reset to the core.
+ */
+ struct oz_port *port = (struct oz_port *)hport;
+ struct oz_hcd *ozhcd = port->ozhcd;
+ oz_trace("PD Reset\n");
+ spin_lock_bh(&port->port_lock);
+ port->flags |= OZ_PORT_F_CHANGED;
+ port->status |= USB_PORT_STAT_RESET;
+ port->status |= (USB_PORT_STAT_C_RESET << 16);
+ spin_unlock_bh(&port->port_lock);
+ oz_clean_endpoints_for_config(ozhcd->hcd, port);
+ usb_hcd_poll_rh_status(ozhcd->hcd);
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+void oz_hcd_get_desc_cnf(void *hport, u8 req_id, int status, u8 *desc,
+ int length, int offset, int total_size)
+{
+ struct oz_port *port = (struct oz_port *)hport;
+ struct urb *urb;
+ int err = 0;
+
+ oz_event_log(OZ_EVT_CTRL_CNF, 0, req_id, 0, status);
+ oz_trace("oz_hcd_get_desc_cnf length = %d offs = %d tot_size = %d\n",
+ length, offset, total_size);
+ urb = oz_find_urb_by_id(port, 0, req_id);
+ if (!urb)
+ return;
+ if (status == 0) {
+ int copy_len;
+ int required_size = urb->transfer_buffer_length;
+ if (required_size > total_size)
+ required_size = total_size;
+ copy_len = required_size-offset;
+ if (length <= copy_len)
+ copy_len = length;
+ memcpy(urb->transfer_buffer+offset, desc, copy_len);
+ offset += copy_len;
+ if (offset < required_size) {
+ struct usb_ctrlrequest *setup =
+ (struct usb_ctrlrequest *)urb->setup_packet;
+ unsigned wvalue = le16_to_cpu(setup->wValue);
+ if (oz_enqueue_ep_urb(port, 0, 0, urb, req_id))
+ err = -ENOMEM;
+ else if (oz_usb_get_desc_req(port->hpd, req_id,
+ setup->bRequestType, (u8)(wvalue>>8),
+ (u8)wvalue, setup->wIndex, offset,
+ required_size-offset)) {
+ oz_dequeue_ep_urb(port, 0, 0, urb);
+ err = -ENOMEM;
+ }
+ if (err == 0)
+ return;
+ }
+ }
+ urb->actual_length = total_size;
+ oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+#ifdef WANT_TRACE
+static void oz_display_conf_type(u8 t)
+{
+ switch (t) {
+ case USB_REQ_GET_STATUS:
+ oz_trace("USB_REQ_GET_STATUS - cnf\n");
+ break;
+ case USB_REQ_CLEAR_FEATURE:
+ oz_trace("USB_REQ_CLEAR_FEATURE - cnf\n");
+ break;
+ case USB_REQ_SET_FEATURE:
+ oz_trace("USB_REQ_SET_FEATURE - cnf\n");
+ break;
+ case USB_REQ_SET_ADDRESS:
+ oz_trace("USB_REQ_SET_ADDRESS - cnf\n");
+ break;
+ case USB_REQ_GET_DESCRIPTOR:
+ oz_trace("USB_REQ_GET_DESCRIPTOR - cnf\n");
+ break;
+ case USB_REQ_SET_DESCRIPTOR:
+ oz_trace("USB_REQ_SET_DESCRIPTOR - cnf\n");
+ break;
+ case USB_REQ_GET_CONFIGURATION:
+ oz_trace("USB_REQ_GET_CONFIGURATION - cnf\n");
+ break;
+ case USB_REQ_SET_CONFIGURATION:
+ oz_trace("USB_REQ_SET_CONFIGURATION - cnf\n");
+ break;
+ case USB_REQ_GET_INTERFACE:
+ oz_trace("USB_REQ_GET_INTERFACE - cnf\n");
+ break;
+ case USB_REQ_SET_INTERFACE:
+ oz_trace("USB_REQ_SET_INTERFACE - cnf\n");
+ break;
+ case USB_REQ_SYNCH_FRAME:
+ oz_trace("USB_REQ_SYNCH_FRAME - cnf\n");
+ break;
+ }
+}
+#else
+#define oz_display_conf_type(__x)
+#endif /* WANT_TRACE */
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static void oz_hcd_complete_set_config(struct oz_port *port, struct urb *urb,
+ u8 rcode, u8 config_num)
+{
+ int rc = 0;
+ struct usb_hcd *hcd = port->ozhcd->hcd;
+ if (rcode == 0) {
+ port->config_num = config_num;
+ oz_clean_endpoints_for_config(hcd, port);
+ if (oz_build_endpoints_for_config(hcd, port,
+ &urb->dev->config[port->config_num-1], GFP_ATOMIC)) {
+ rc = -ENOMEM;
+ }
+ } else {
+ rc = -ENOMEM;
+ }
+ oz_complete_urb(hcd, urb, rc, 0);
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static void oz_hcd_complete_set_interface(struct oz_port *port, struct urb *urb,
+ u8 rcode, u8 if_num, u8 alt)
+{
+ struct usb_hcd *hcd = port->ozhcd->hcd;
+ int rc = 0;
+ if (rcode == 0) {
+ struct usb_host_config *config;
+ struct usb_host_interface *intf;
+ oz_trace("Set interface %d alt %d\n", if_num, alt);
+ oz_clean_endpoints_for_interface(hcd, port, if_num);
+ config = &urb->dev->config[port->config_num-1];
+ intf = &config->intf_cache[if_num]->altsetting[alt];
+ if (oz_build_endpoints_for_interface(hcd, port, intf,
+ GFP_ATOMIC))
+ rc = -ENOMEM;
+ else
+ port->iface[if_num].alt = alt;
+ } else {
+ rc = -ENOMEM;
+ }
+ oz_complete_urb(hcd, urb, rc, 0);
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+void oz_hcd_control_cnf(void *hport, u8 req_id, u8 rcode, u8 *data,
+ int data_len)
+{
+ struct oz_port *port = (struct oz_port *)hport;
+ struct urb *urb;
+ struct usb_ctrlrequest *setup;
+ struct usb_hcd *hcd = port->ozhcd->hcd;
+ unsigned windex;
+ unsigned wvalue;
+
+ oz_event_log(OZ_EVT_CTRL_CNF, 0, req_id, 0, rcode);
+ oz_trace("oz_hcd_control_cnf rcode=%u len=%d\n", rcode, data_len);
+ urb = oz_find_urb_by_id(port, 0, req_id);
+ if (!urb) {
+ oz_trace("URB not found\n");
+ return;
+ }
+ setup = (struct usb_ctrlrequest *)urb->setup_packet;
+ windex = le16_to_cpu(setup->wIndex);
+ wvalue = le16_to_cpu(setup->wValue);
+ if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+ /* Standard requests */
+ oz_display_conf_type(setup->bRequest);
+ switch (setup->bRequest) {
+ case USB_REQ_SET_CONFIGURATION:
+ oz_hcd_complete_set_config(port, urb, rcode,
+ (u8)wvalue);
+ break;
+ case USB_REQ_SET_INTERFACE:
+ oz_hcd_complete_set_interface(port, urb, rcode,
+ (u8)windex, (u8)wvalue);
+ break;
+ default:
+ oz_complete_urb(hcd, urb, 0, 0);
+ }
+
+ } else {
+ int copy_len;
+ oz_trace("VENDOR-CLASS - cnf\n");
+ if (data_len <= urb->transfer_buffer_length)
+ copy_len = data_len;
+ else
+ copy_len = urb->transfer_buffer_length;
+ if (copy_len)
+ memcpy(urb->transfer_buffer, data, copy_len);
+ urb->actual_length = copy_len;
+ oz_complete_urb(hcd, urb, 0, 0);
+ }
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq-serialized
+ */
+static int oz_hcd_buffer_data(struct oz_endpoint *ep, u8 *data, int data_len)
+{
+ int space;
+ int copy_len;
+ if (!ep->buffer)
+ return -1;
+ space = ep->out_ix-ep->in_ix-1;
+ if (space < 0)
+ space += ep->buffer_size;
+ if (space < (data_len+1)) {
+ oz_trace("Buffer full\n");
+ return -1;
+ }
+ ep->buffer[ep->in_ix] = (u8)data_len;
+ if (++ep->in_ix == ep->buffer_size)
+ ep->in_ix = 0;
+ copy_len = ep->buffer_size - ep->in_ix;
+ if (copy_len > data_len)
+ copy_len = data_len;
+ memcpy(&ep->buffer[ep->in_ix], data, copy_len);
+
+ if (copy_len < data_len) {
+ memcpy(ep->buffer, data+copy_len, data_len-copy_len);
+ ep->in_ix = data_len-copy_len;
+ } else {
+ ep->in_ix += copy_len;
+ }
+ if (ep->in_ix == ep->buffer_size)
+ ep->in_ix = 0;
+ ep->buffered_units++;
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq-serialized
+ */
+void oz_hcd_data_ind(void *hport, u8 endpoint, u8 *data, int data_len)
+{
+ struct oz_port *port = (struct oz_port *)hport;
+ struct oz_endpoint *ep;
+ struct oz_hcd *ozhcd = port->ozhcd;
+ spin_lock_bh(&ozhcd->hcd_lock);
+ ep = port->in_ep[endpoint & USB_ENDPOINT_NUMBER_MASK];
+ if (ep == 0)
+ goto done;
+ switch (ep->attrib & USB_ENDPOINT_XFERTYPE_MASK) {
+ case USB_ENDPOINT_XFER_INT:
+ case USB_ENDPOINT_XFER_BULK:
+ if (!list_empty(&ep->urb_list)) {
+ struct oz_urb_link *urbl =
+ list_first_entry(&ep->urb_list,
+ struct oz_urb_link, link);
+ struct urb *urb;
+ int copy_len;
+ list_del_init(&urbl->link);
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ urb = urbl->urb;
+ oz_free_urb_link(urbl);
+ if (data_len <= urb->transfer_buffer_length)
+ copy_len = data_len;
+ else
+ copy_len = urb->transfer_buffer_length;
+ memcpy(urb->transfer_buffer, data, copy_len);
+ urb->actual_length = copy_len;
+ oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
+ return;
+ }
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ oz_hcd_buffer_data(ep, data, data_len);
+ break;
+ }
+done:
+ spin_unlock_bh(&ozhcd->hcd_lock);
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static inline int oz_usb_get_frame_number(void)
+{
+ return jiffies_to_msecs(get_jiffies_64());
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+int oz_hcd_heartbeat(void *hport)
+{
+ int rc = 0;
+ struct oz_port *port = (struct oz_port *)hport;
+ struct oz_hcd *ozhcd = port->ozhcd;
+ struct oz_urb_link *urbl;
+ struct list_head xfr_list;
+ struct list_head *e;
+ struct list_head *n;
+ struct urb *urb;
+ struct oz_endpoint *ep;
+ unsigned long now = jiffies;
+ INIT_LIST_HEAD(&xfr_list);
+ /* Check the OUT isoc endpoints to see if any URB data can be sent.
+ */
+ spin_lock_bh(&ozhcd->hcd_lock);
+ list_for_each(e, &port->isoc_out_ep) {
+ ep = ep_from_link(e);
+ if (ep->credit < 0)
+ continue;
+ ep->credit += (now - ep->last_jiffies);
+ if (ep->credit > ep->credit_ceiling)
+ ep->credit = ep->credit_ceiling;
+ oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num, 0, 0, ep->credit);
+ ep->last_jiffies = now;
+ while (ep->credit && !list_empty(&ep->urb_list)) {
+ urbl = list_first_entry(&ep->urb_list,
+ struct oz_urb_link, link);
+ urb = urbl->urb;
+ if (ep->credit < urb->number_of_packets)
+ break;
+ ep->credit -= urb->number_of_packets;
+ oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num, 0, 0,
+ ep->credit);
+ list_del(&urbl->link);
+ list_add_tail(&urbl->link, &xfr_list);
+ }
+ }
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ /* Send to PD and complete URBs.
+ */
+ list_for_each_safe(e, n, &xfr_list) {
+ unsigned long t;
+ urbl = container_of(e, struct oz_urb_link, link);
+ urb = urbl->urb;
+ t = urbl->submit_jiffies;
+ list_del_init(e);
+ urb->error_count = 0;
+ urb->start_frame = oz_usb_get_frame_number();
+ oz_usb_send_isoc(port->hpd, urbl->ep_num, urb);
+ oz_free_urb_link(urbl);
+ oz_complete_urb(port->ozhcd->hcd, urb, 0, t);
+ }
+ /* Check the IN isoc endpoints to see if any URBs can be completed.
+ */
+ spin_lock_bh(&ozhcd->hcd_lock);
+ list_for_each(e, &port->isoc_in_ep) {
+ struct oz_endpoint *ep = ep_from_link(e);
+ if (ep->flags & OZ_F_EP_BUFFERING) {
+ if (ep->buffered_units * OZ_IN_BUFFERING_UNITS) {
+ ep->flags &= ~OZ_F_EP_BUFFERING;
+ ep->credit = 0;
+ oz_event_log(OZ_EVT_EP_CREDIT,
+ ep->ep_num | USB_DIR_IN,
+ 0, 0, ep->credit);
+ ep->last_jiffies = now;
+ ep->start_frame = 0;
+ oz_event_log(OZ_EVT_EP_BUFFERING,
+ ep->ep_num | USB_DIR_IN, 0, 0, 0);
+ }
+ continue;
+ }
+ ep->credit += (now - ep->last_jiffies);
+ oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num | USB_DIR_IN,
+ 0, 0, ep->credit);
+ ep->last_jiffies = now;
+ while (!list_empty(&ep->urb_list)) {
+ struct oz_urb_link *urbl =
+ list_first_entry(&ep->urb_list,
+ struct oz_urb_link, link);
+ struct urb *urb = urbl->urb;
+ int len = 0;
+ int copy_len;
+ int i;
+ if (ep->credit < urb->number_of_packets)
+ break;
+ if (ep->buffered_units < urb->number_of_packets)
+ break;
+ urb->actual_length = 0;
+ for (i = 0; i < urb->number_of_packets; i++) {
+ len = ep->buffer[ep->out_ix];
+ if (++ep->out_ix == ep->buffer_size)
+ ep->out_ix = 0;
+ copy_len = ep->buffer_size - ep->out_ix;
+ if (copy_len > len)
+ copy_len = len;
+ memcpy(urb->transfer_buffer,
+ &ep->buffer[ep->out_ix], copy_len);
+ if (copy_len < len) {
+ memcpy(urb->transfer_buffer+copy_len,
+ ep->buffer, len-copy_len);
+ ep->out_ix = len-copy_len;
+ } else
+ ep->out_ix += copy_len;
+ if (ep->out_ix == ep->buffer_size)
+ ep->out_ix = 0;
+ urb->iso_frame_desc[i].offset =
+ urb->actual_length;
+ urb->actual_length += len;
+ urb->iso_frame_desc[i].actual_length = len;
+ urb->iso_frame_desc[i].status = 0;
+ }
+ ep->buffered_units -= urb->number_of_packets;
+ urb->error_count = 0;
+ urb->start_frame = ep->start_frame;
+ ep->start_frame += urb->number_of_packets;
+ list_del(&urbl->link);
+ list_add_tail(&urbl->link, &xfr_list);
+ ep->credit -= urb->number_of_packets;
+ oz_event_log(OZ_EVT_EP_CREDIT, ep->ep_num | USB_DIR_IN,
+ 0, 0, ep->credit);
+ }
+ }
+ if (!list_empty(&port->isoc_out_ep) || !list_empty(&port->isoc_in_ep))
+ rc = 1;
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ /* Complete the filled URBs.
+ */
+ list_for_each_safe(e, n, &xfr_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ urb = urbl->urb;
+ list_del_init(e);
+ oz_free_urb_link(urbl);
+ oz_complete_urb(port->ozhcd->hcd, urb, 0, 0);
+ }
+ /* Check if there are any ep0 requests that have timed out.
+ * If so resent to PD.
+ */
+ ep = port->out_ep[0];
+ if (ep) {
+ struct list_head *e;
+ struct list_head *n;
+ spin_lock_bh(&ozhcd->hcd_lock);
+ list_for_each_safe(e, n, &ep->urb_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (time_after(now, urbl->submit_jiffies+HZ/2)) {
+ oz_trace("%ld: Request 0x%p timeout\n",
+ now, urbl->urb);
+ urbl->submit_jiffies = now;
+ list_del(e);
+ list_add_tail(e, &xfr_list);
+ }
+ }
+ if (!list_empty(&ep->urb_list))
+ rc = 1;
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ e = xfr_list.next;
+ while (e != &xfr_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ e = e->next;
+ oz_trace("Resending request to PD.\n");
+ oz_process_ep0_urb(ozhcd, urbl->urb, GFP_ATOMIC);
+ oz_free_urb_link(urbl);
+ }
+ }
+ return rc;
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static int oz_build_endpoints_for_interface(struct usb_hcd *hcd,
+ struct oz_port *port,
+ struct usb_host_interface *intf, gfp_t mem_flags)
+{
+ struct oz_hcd *ozhcd = port->ozhcd;
+ int i;
+ int if_ix = intf->desc.bInterfaceNumber;
+ int request_heartbeat = 0;
+ oz_trace("interface[%d] = %p\n", if_ix, intf);
+ for (i = 0; i < intf->desc.bNumEndpoints; i++) {
+ struct usb_host_endpoint *hep = &intf->endpoint[i];
+ u8 ep_addr = hep->desc.bEndpointAddress;
+ u8 ep_num = ep_addr & USB_ENDPOINT_NUMBER_MASK;
+ struct oz_endpoint *ep;
+ int buffer_size = 0;
+
+ oz_trace("%d bEndpointAddress = %x\n", i, ep_addr);
+ if ((ep_addr & USB_ENDPOINT_DIR_MASK) &&
+ ((hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_ISOC)) {
+ buffer_size = 24*1024;
+ }
+
+ ep = oz_ep_alloc(mem_flags, buffer_size);
+ if (!ep) {
+ oz_clean_endpoints_for_interface(hcd, port, if_ix);
+ return -ENOMEM;
+ }
+ ep->attrib = hep->desc.bmAttributes;
+ ep->ep_num = ep_num;
+ if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_ISOC) {
+ oz_trace("wMaxPacketSize = %d\n",
+ hep->desc.wMaxPacketSize);
+ ep->credit_ceiling = 200;
+ if (ep_addr & USB_ENDPOINT_DIR_MASK) {
+ ep->flags |= OZ_F_EP_BUFFERING;
+ oz_event_log(OZ_EVT_EP_BUFFERING,
+ ep->ep_num | USB_DIR_IN, 1, 0, 0);
+ } else {
+ ep->flags |= OZ_F_EP_HAVE_STREAM;
+ if (oz_usb_stream_create(port->hpd, ep_num))
+ ep->flags &= ~OZ_F_EP_HAVE_STREAM;
+ }
+ }
+ spin_lock_bh(&ozhcd->hcd_lock);
+ if (ep_addr & USB_ENDPOINT_DIR_MASK) {
+ port->in_ep[ep_num] = ep;
+ port->iface[if_ix].ep_mask |=
+ (1<<(ep_num+OZ_NB_ENDPOINTS));
+ if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_ISOC) {
+ list_add_tail(&ep->link, &port->isoc_in_ep);
+ request_heartbeat = 1;
+ }
+ } else {
+ port->out_ep[ep_num] = ep;
+ port->iface[if_ix].ep_mask |= (1<<ep_num);
+ if ((ep->attrib & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_ISOC) {
+ list_add_tail(&ep->link, &port->isoc_out_ep);
+ request_heartbeat = 1;
+ }
+ }
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ if (request_heartbeat && port->hpd)
+ oz_usb_request_heartbeat(port->hpd);
+ }
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static void oz_clean_endpoints_for_interface(struct usb_hcd *hcd,
+ struct oz_port *port, int if_ix)
+{
+ struct oz_hcd *ozhcd = port->ozhcd;
+ unsigned mask;
+ int i;
+ struct list_head ep_list;
+
+ oz_trace("Deleting endpoints for interface %d\n", if_ix);
+ if (if_ix >= port->num_iface)
+ return;
+ INIT_LIST_HEAD(&ep_list);
+ spin_lock_bh(&ozhcd->hcd_lock);
+ mask = port->iface[if_ix].ep_mask;
+ port->iface[if_ix].ep_mask = 0;
+ for (i = 0; i < OZ_NB_ENDPOINTS; i++) {
+ struct list_head *e;
+ /* Gather OUT endpoints.
+ */
+ if ((mask & (1<<i)) && port->out_ep[i]) {
+ e = &port->out_ep[i]->link;
+ port->out_ep[i] = 0;
+ /* Remove from isoc list if present.
+ */
+ list_del(e);
+ list_add_tail(e, &ep_list);
+ }
+ /* Gather IN endpoints.
+ */
+ if ((mask & (1<<(i+OZ_NB_ENDPOINTS))) && port->in_ep[i]) {
+ e = &port->in_ep[i]->link;
+ port->in_ep[i] = 0;
+ list_del(e);
+ list_add_tail(e, &ep_list);
+ }
+ }
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ while (!list_empty(&ep_list)) {
+ struct oz_endpoint *ep =
+ list_first_entry(&ep_list, struct oz_endpoint, link);
+ list_del_init(&ep->link);
+ oz_ep_free(port, ep);
+ }
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static int oz_build_endpoints_for_config(struct usb_hcd *hcd,
+ struct oz_port *port, struct usb_host_config *config,
+ gfp_t mem_flags)
+{
+ struct oz_hcd *ozhcd = port->ozhcd;
+ int i;
+ int num_iface = config->desc.bNumInterfaces;
+ if (num_iface) {
+ struct oz_interface *iface = (struct oz_interface *)
+ oz_alloc(num_iface*sizeof(struct oz_interface),
+ mem_flags | __GFP_ZERO);
+ if (!iface)
+ return -ENOMEM;
+ spin_lock_bh(&ozhcd->hcd_lock);
+ port->iface = iface;
+ port->num_iface = num_iface;
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ }
+ for (i = 0; i < num_iface; i++) {
+ struct usb_host_interface *intf =
+ &config->intf_cache[i]->altsetting[0];
+ if (oz_build_endpoints_for_interface(hcd, port, intf,
+ mem_flags))
+ goto fail;
+ }
+ return 0;
+fail:
+ oz_clean_endpoints_for_config(hcd, port);
+ return -1;
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ */
+static void oz_clean_endpoints_for_config(struct usb_hcd *hcd,
+ struct oz_port *port)
+{
+ struct oz_hcd *ozhcd = port->ozhcd;
+ int i;
+ oz_trace("Deleting endpoints for configuration.\n");
+ for (i = 0; i < port->num_iface; i++)
+ oz_clean_endpoints_for_interface(hcd, port, i);
+ spin_lock_bh(&ozhcd->hcd_lock);
+ if (port->iface) {
+ oz_trace("Freeing interfaces object.\n");
+ oz_free(port->iface);
+ port->iface = 0;
+ }
+ port->num_iface = 0;
+ spin_unlock_bh(&ozhcd->hcd_lock);
+}
+/*------------------------------------------------------------------------------
+ * Context: tasklet
+ */
+static void *oz_claim_hpd(struct oz_port *port)
+{
+ void *hpd = 0;
+ struct oz_hcd *ozhcd = port->ozhcd;
+ spin_lock_bh(&ozhcd->hcd_lock);
+ hpd = port->hpd;
+ if (hpd)
+ oz_usb_get(hpd);
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ return hpd;
+}
+/*------------------------------------------------------------------------------
+ * Context: tasklet
+ */
+static void oz_process_ep0_urb(struct oz_hcd *ozhcd, struct urb *urb,
+ gfp_t mem_flags)
+{
+ struct usb_ctrlrequest *setup;
+ unsigned windex;
+ unsigned wvalue;
+ unsigned wlength;
+ void *hpd = 0;
+ u8 req_id;
+ int rc = 0;
+ unsigned complete = 0;
+
+ int port_ix = -1;
+ struct oz_port *port = 0;
+
+ oz_trace2(OZ_TRACE_URB, "%lu: oz_process_ep0_urb(%p)\n", jiffies, urb);
+ port_ix = oz_get_port_from_addr(ozhcd, urb->dev->devnum);
+ if (port_ix < 0) {
+ rc = -EPIPE;
+ goto out;
+ }
+ port = &ozhcd->ports[port_ix];
+ if (((port->flags & OZ_PORT_F_PRESENT) == 0)
+ || (port->flags & OZ_PORT_F_DYING)) {
+ oz_trace("Refusing URB port_ix = %d devnum = %d\n",
+ port_ix, urb->dev->devnum);
+ rc = -EPIPE;
+ goto out;
+ }
+ /* Store port in private context data.
+ */
+ urb->hcpriv = port;
+ setup = (struct usb_ctrlrequest *)urb->setup_packet;
+ windex = le16_to_cpu(setup->wIndex);
+ wvalue = le16_to_cpu(setup->wValue);
+ wlength = le16_to_cpu(setup->wLength);
+ oz_trace2(OZ_TRACE_CTRL_DETAIL, "bRequestType = %x\n",
+ setup->bRequestType);
+ oz_trace2(OZ_TRACE_CTRL_DETAIL, "bRequest = %x\n", setup->bRequest);
+ oz_trace2(OZ_TRACE_CTRL_DETAIL, "wValue = %x\n", wvalue);
+ oz_trace2(OZ_TRACE_CTRL_DETAIL, "wIndex = %x\n", windex);
+ oz_trace2(OZ_TRACE_CTRL_DETAIL, "wLength = %x\n", wlength);
+
+ req_id = port->next_req_id++;
+ hpd = oz_claim_hpd(port);
+ if (hpd == 0) {
+ oz_trace("Cannot claim port\n");
+ rc = -EPIPE;
+ goto out;
+ }
+
+ if ((setup->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
+ /* Standard requests
+ */
+ switch (setup->bRequest) {
+ case USB_REQ_GET_DESCRIPTOR:
+ oz_trace("USB_REQ_GET_DESCRIPTOR - req\n");
+ break;
+ case USB_REQ_SET_ADDRESS:
+ oz_event_log(OZ_EVT_CTRL_LOCAL, setup->bRequest,
+ 0, 0, setup->bRequestType);
+ oz_trace("USB_REQ_SET_ADDRESS - req\n");
+ oz_trace("Port %d address is 0x%x\n", ozhcd->conn_port,
+ (u8)le16_to_cpu(setup->wValue));
+ spin_lock_bh(&ozhcd->hcd_lock);
+ if (ozhcd->conn_port >= 0) {
+ ozhcd->ports[ozhcd->conn_port].bus_addr =
+ (u8)le16_to_cpu(setup->wValue);
+ oz_trace("Clearing conn_port\n");
+ ozhcd->conn_port = -1;
+ }
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ complete = 1;
+ break;
+ case USB_REQ_SET_CONFIGURATION:
+ oz_trace("USB_REQ_SET_CONFIGURATION - req\n");
+ break;
+ case USB_REQ_GET_CONFIGURATION:
+ /* We short curcuit this case and reply directly since
+ * we have the selected configuration number cached.
+ */
+ oz_event_log(OZ_EVT_CTRL_LOCAL, setup->bRequest, 0, 0,
+ setup->bRequestType);
+ oz_trace("USB_REQ_GET_CONFIGURATION - reply now\n");
+ if (urb->transfer_buffer_length >= 1) {
+ urb->actual_length = 1;
+ *((u8 *)urb->transfer_buffer) =
+ port->config_num;
+ complete = 1;
+ } else {
+ rc = -EPIPE;
+ }
+ break;
+ case USB_REQ_GET_INTERFACE:
+ /* We short curcuit this case and reply directly since
+ * we have the selected interface alternative cached.
+ */
+ oz_event_log(OZ_EVT_CTRL_LOCAL, setup->bRequest, 0, 0,
+ setup->bRequestType);
+ oz_trace("USB_REQ_GET_INTERFACE - reply now\n");
+ if (urb->transfer_buffer_length >= 1) {
+ urb->actual_length = 1;
+ *((u8 *)urb->transfer_buffer) =
+ port->iface[(u8)windex].alt;
+ oz_trace("interface = %d alt = %d\n",
+ windex, port->iface[(u8)windex].alt);
+ complete = 1;
+ } else {
+ rc = -EPIPE;
+ }
+ break;
+ case USB_REQ_SET_INTERFACE:
+ oz_trace("USB_REQ_SET_INTERFACE - req\n");
+ break;
+ }
+ }
+ if (!rc && !complete) {
+ int data_len = 0;
+ if ((setup->bRequestType & USB_DIR_IN) == 0)
+ data_len = wlength;
+ if (oz_usb_control_req(port->hpd, req_id, setup,
+ urb->transfer_buffer, data_len)) {
+ rc = -ENOMEM;
+ } else {
+ /* Note: we are queuing the request after we have
+ * submitted it to be tranmitted. If the request were
+ * to complete before we queued it then it would not
+ * be found in the queue. It seems impossible for
+ * this to happen but if it did the request would
+ * be resubmitted so the problem would hopefully
+ * resolve itself. Putting the request into the
+ * queue before it has been sent is worse since the
+ * urb could be cancelled while we are using it
+ * to build the request.
+ */
+ if (oz_enqueue_ep_urb(port, 0, 0, urb, req_id))
+ rc = -ENOMEM;
+ }
+ }
+ oz_usb_put(hpd);
+out:
+ if (rc || complete) {
+ oz_trace("Completing request locally\n");
+ oz_complete_urb(ozhcd->hcd, urb, rc, 0);
+ } else {
+ oz_usb_request_heartbeat(port->hpd);
+ }
+}
+/*------------------------------------------------------------------------------
+ * Context: tasklet
+ */
+static int oz_urb_process(struct oz_hcd *ozhcd, struct urb *urb)
+{
+ int rc = 0;
+ struct oz_port *port = urb->hcpriv;
+ u8 ep_addr;
+ /* When we are paranoid we keep a list of urbs which we check against
+ * before handing one back. This is just for debugging during
+ * development and should be turned off in the released driver.
+ */
+ oz_remember_urb(urb);
+ /* Check buffer is valid.
+ */
+ if (!urb->transfer_buffer && urb->transfer_buffer_length)
+ return -EINVAL;
+ /* Check if there is a device at the port - refuse if not.
+ */
+ if ((port->flags & OZ_PORT_F_PRESENT) == 0)
+ return -EPIPE;
+ ep_addr = usb_pipeendpoint(urb->pipe);
+ if (ep_addr) {
+ /* If the request is not for EP0 then queue it.
+ */
+ if (oz_enqueue_ep_urb(port, ep_addr, usb_pipein(urb->pipe),
+ urb, 0))
+ rc = -EPIPE;
+ } else {
+ oz_process_ep0_urb(ozhcd, urb, GFP_ATOMIC);
+ }
+ return rc;
+}
+/*------------------------------------------------------------------------------
+ * Context: tasklet
+ */
+static void oz_urb_process_tasklet(unsigned long unused)
+{
+ unsigned long irq_state;
+ struct urb *urb;
+ struct oz_hcd *ozhcd = oz_hcd_claim();
+ int rc = 0;
+ if (ozhcd == 0)
+ return;
+ /* This is called from a tasklet so is in softirq context but the urb
+ * list is filled from any context so we need to lock
+ * appropriately while removing urbs.
+ */
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ while (!list_empty(&ozhcd->urb_pending_list)) {
+ struct oz_urb_link *urbl =
+ list_first_entry(&ozhcd->urb_pending_list,
+ struct oz_urb_link, link);
+ list_del_init(&urbl->link);
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ urb = urbl->urb;
+ oz_free_urb_link(urbl);
+ rc = oz_urb_process(ozhcd, urb);
+ if (rc)
+ oz_complete_urb(ozhcd->hcd, urb, rc, 0);
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ }
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ oz_hcd_put(ozhcd);
+}
+/*------------------------------------------------------------------------------
+ * This function searches for the urb in any of the lists it could be in.
+ * If it is found it is removed from the list and completed. If the urb is
+ * being processed then it won't be in a list so won't be found. However, the
+ * call to usb_hcd_check_unlink_urb() will set the value of the unlinked field
+ * to a non-zero value. When an attempt is made to put the urb back in a list
+ * the unlinked field will be checked and the urb will then be completed.
+ * Context: tasklet
+ */
+static void oz_urb_cancel(struct oz_port *port, u8 ep_num, struct urb *urb)
+{
+ struct oz_urb_link *urbl = 0;
+ struct list_head *e;
+ struct oz_hcd *ozhcd;
+ unsigned long irq_state;
+ u8 ix;
+ if (port == 0) {
+ oz_trace("ERRORERROR: oz_urb_cancel(%p) port is null\n", urb);
+ return;
+ }
+ ozhcd = port->ozhcd;
+ if (ozhcd == 0) {
+ oz_trace("ERRORERROR: oz_urb_cancel(%p) ozhcd is null\n", urb);
+ return;
+ }
+
+ /* Look in the tasklet queue.
+ */
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ list_for_each(e, &ozhcd->urb_cancel_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (urb == urbl->urb) {
+ list_del_init(e);
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ goto out2;
+ }
+ }
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ urbl = 0;
+
+ /* Look in the orphanage.
+ */
+ spin_lock_irqsave(&ozhcd->hcd_lock, irq_state);
+ list_for_each(e, &ozhcd->orphanage) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (urbl->urb == urb) {
+ list_del(e);
+ oz_trace("Found urb in orphanage\n");
+ goto out;
+ }
+ }
+ ix = (ep_num & 0xf);
+ urbl = 0;
+ if ((ep_num & USB_DIR_IN) && ix)
+ urbl = oz_remove_urb(port->in_ep[ix], urb);
+ else
+ urbl = oz_remove_urb(port->out_ep[ix], urb);
+out:
+ spin_unlock_irqrestore(&ozhcd->hcd_lock, irq_state);
+out2:
+ if (urbl) {
+ urb->actual_length = 0;
+ oz_free_urb_link(urbl);
+ oz_complete_urb(ozhcd->hcd, urb, -EPIPE, 0);
+ }
+}
+/*------------------------------------------------------------------------------
+ * Context: tasklet
+ */
+static void oz_urb_cancel_tasklet(unsigned long unused)
+{
+ unsigned long irq_state;
+ struct urb *urb;
+ struct oz_hcd *ozhcd = oz_hcd_claim();
+ if (ozhcd == 0)
+ return;
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ while (!list_empty(&ozhcd->urb_cancel_list)) {
+ struct oz_urb_link *urbl =
+ list_first_entry(&ozhcd->urb_cancel_list,
+ struct oz_urb_link, link);
+ list_del_init(&urbl->link);
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ urb = urbl->urb;
+ if (urb->unlinked)
+ oz_urb_cancel(urbl->port, urbl->ep_num, urb);
+ oz_free_urb_link(urbl);
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ }
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ oz_hcd_put(ozhcd);
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static void oz_hcd_clear_orphanage(struct oz_hcd *ozhcd, int status)
+{
+ if (ozhcd) {
+ struct oz_urb_link *urbl;
+ while (!list_empty(&ozhcd->orphanage)) {
+ urbl = list_first_entry(&ozhcd->orphanage,
+ struct oz_urb_link, link);
+ list_del(&urbl->link);
+ oz_complete_urb(ozhcd->hcd, urbl->urb, status, 0);
+ oz_free_urb_link(urbl);
+ }
+ }
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static int oz_hcd_start(struct usb_hcd *hcd)
+{
+ oz_trace("oz_hcd_start()\n");
+ hcd->power_budget = 200;
+ hcd->state = HC_STATE_RUNNING;
+ hcd->uses_new_polling = 1;
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static void oz_hcd_stop(struct usb_hcd *hcd)
+{
+ oz_trace("oz_hcd_stop()\n");
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static void oz_hcd_shutdown(struct usb_hcd *hcd)
+{
+ oz_trace("oz_hcd_shutdown()\n");
+}
+/*------------------------------------------------------------------------------
+ * Context: any
+ */
+#ifdef WANT_EVENT_TRACE
+static u8 oz_get_irq_ctx(void)
+{
+ u8 irq_info = 0;
+ if (in_interrupt())
+ irq_info |= 1;
+ if (in_irq())
+ irq_info |= 2;
+ return irq_info;
+}
+#endif /* WANT_EVENT_TRACE */
+/*------------------------------------------------------------------------------
+ * Called to queue an urb for the device.
+ * This function should return a non-zero error code if it fails the urb but
+ * should not call usb_hcd_giveback_urb().
+ * Context: any
+ */
+static int oz_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags)
+{
+ struct oz_hcd *ozhcd = oz_hcd_private(hcd);
+ int rc = 0;
+ int port_ix;
+ struct oz_port *port;
+ unsigned long irq_state;
+ struct oz_urb_link *urbl;
+ oz_trace2(OZ_TRACE_URB, "%lu: oz_hcd_urb_enqueue(%p)\n",
+ jiffies, urb);
+ oz_event_log(OZ_EVT_URB_SUBMIT, oz_get_irq_ctx(),
+ (u16)urb->number_of_packets, urb, urb->pipe);
+ if (unlikely(ozhcd == 0)) {
+ oz_trace2(OZ_TRACE_URB, "%lu: Refused urb(%p) not ozhcd.\n",
+ jiffies, urb);
+ return -EPIPE;
+ }
+ if (unlikely(hcd->state != HC_STATE_RUNNING)) {
+ oz_trace2(OZ_TRACE_URB, "%lu: Refused urb(%p) not running.\n",
+ jiffies, urb);
+ return -EPIPE;
+ }
+ port_ix = oz_get_port_from_addr(ozhcd, urb->dev->devnum);
+ if (port_ix < 0)
+ return -EPIPE;
+ port = &ozhcd->ports[port_ix];
+ if (port == 0)
+ return -EPIPE;
+ if ((port->flags & OZ_PORT_F_PRESENT) == 0) {
+ oz_trace("Refusing URB port_ix = %d devnum = %d\n",
+ port_ix, urb->dev->devnum);
+ return -EPIPE;
+ }
+ urb->hcpriv = port;
+ /* Put request in queue for processing by tasklet.
+ */
+ urbl = oz_alloc_urb_link();
+ if (unlikely(urbl == 0))
+ return -ENOMEM;
+ urbl->urb = urb;
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ rc = usb_hcd_link_urb_to_ep(hcd, urb);
+ if (unlikely(rc)) {
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ oz_free_urb_link(urbl);
+ return rc;
+ }
+ list_add_tail(&urbl->link, &ozhcd->urb_pending_list);
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ tasklet_schedule(&g_urb_process_tasklet);
+ atomic_inc(&g_pending_urbs);
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: tasklet
+ */
+static struct oz_urb_link *oz_remove_urb(struct oz_endpoint *ep,
+ struct urb *urb)
+{
+ struct oz_urb_link *urbl = 0;
+ struct list_head *e;
+ if (unlikely(ep == 0))
+ return 0;
+ list_for_each(e, &ep->urb_list) {
+ urbl = container_of(e, struct oz_urb_link, link);
+ if (urbl->urb == urb) {
+ list_del_init(e);
+ if (usb_pipeisoc(urb->pipe)) {
+ ep->credit -= urb->number_of_packets;
+ if (ep->credit < 0)
+ ep->credit = 0;
+ oz_event_log(OZ_EVT_EP_CREDIT,
+ usb_pipein(urb->pipe) ?
+ (ep->ep_num | USB_DIR_IN) : ep->ep_num,
+ 0, 0, ep->credit);
+ }
+ return urbl;
+ }
+ }
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Called to dequeue a previously submitted urb for the device.
+ * Context: any
+ */
+static int oz_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ struct oz_hcd *ozhcd = oz_hcd_private(hcd);
+ struct oz_urb_link *urbl = 0;
+ int rc;
+ unsigned long irq_state;
+ oz_trace2(OZ_TRACE_URB, "%lu: oz_hcd_urb_dequeue(%p)\n", jiffies, urb);
+ urbl = oz_alloc_urb_link();
+ if (unlikely(urbl == 0))
+ return -ENOMEM;
+ spin_lock_irqsave(&g_tasklet_lock, irq_state);
+ /* The following function checks the urb is still in the queue
+ * maintained by the core and that the unlinked field is zero.
+ * If both are true the function sets the unlinked field and returns
+ * zero. Otherwise it returns an error.
+ */
+ rc = usb_hcd_check_unlink_urb(hcd, urb, status);
+ /* We have to check we haven't completed the urb or are about
+ * to complete it. When we do we set hcpriv to 0 so if this has
+ * already happened we don't put the urb in the cancel queue.
+ */
+ if ((rc == 0) && urb->hcpriv) {
+ urbl->urb = urb;
+ urbl->port = (struct oz_port *)urb->hcpriv;
+ urbl->ep_num = usb_pipeendpoint(urb->pipe);
+ if (usb_pipein(urb->pipe))
+ urbl->ep_num |= USB_DIR_IN;
+ list_add_tail(&urbl->link, &ozhcd->urb_cancel_list);
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ tasklet_schedule(&g_urb_cancel_tasklet);
+ } else {
+ spin_unlock_irqrestore(&g_tasklet_lock, irq_state);
+ oz_free_urb_link(urbl);
+ }
+ return rc;
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static void oz_hcd_endpoint_disable(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ oz_trace("oz_hcd_endpoint_disable\n");
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static void oz_hcd_endpoint_reset(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ oz_trace("oz_hcd_endpoint_reset\n");
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static int oz_hcd_get_frame_number(struct usb_hcd *hcd)
+{
+ oz_trace("oz_hcd_get_frame_number\n");
+ return oz_usb_get_frame_number();
+}
+/*------------------------------------------------------------------------------
+ * Context: softirq
+ * This is called as a consquence of us calling usb_hcd_poll_rh_status() and we
+ * always do that in softirq context.
+ */
+static int oz_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ struct oz_hcd *ozhcd = oz_hcd_private(hcd);
+ int i;
+
+ oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_status_data()\n");
+ buf[0] = 0;
+
+ spin_lock_bh(&ozhcd->hcd_lock);
+ for (i = 0; i < OZ_NB_PORTS; i++) {
+ if (ozhcd->ports[i].flags & OZ_PORT_F_CHANGED) {
+ oz_trace2(OZ_TRACE_HUB, "Port %d changed\n", i);
+ ozhcd->ports[i].flags &= ~OZ_PORT_F_CHANGED;
+ buf[0] |= 1<<(i+1);
+ }
+ }
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ return buf[0] ? 1 : 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static void oz_get_hub_descriptor(struct usb_hcd *hcd,
+ struct usb_hub_descriptor *desc)
+{
+ oz_trace2(OZ_TRACE_HUB, "GetHubDescriptor\n");
+ memset(desc, 0, sizeof(*desc));
+ desc->bDescriptorType = 0x29;
+ desc->bDescLength = 9;
+ desc->wHubCharacteristics = (__force __u16)
+ __constant_cpu_to_le16(0x0001);
+ desc->bNbrPorts = OZ_NB_PORTS;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_set_port_feature(struct usb_hcd *hcd, u16 wvalue, u16 windex)
+{
+ struct oz_port *port;
+ int err = 0;
+ u8 port_id = (u8)windex;
+ struct oz_hcd *ozhcd = oz_hcd_private(hcd);
+ unsigned set_bits = 0;
+ unsigned clear_bits = 0;
+ oz_trace2(OZ_TRACE_HUB, "SetPortFeature\n");
+ if ((port_id < 1) || (port_id > OZ_NB_PORTS))
+ return -EPIPE;
+ port = &ozhcd->ports[port_id-1];
+ switch (wvalue) {
+ case USB_PORT_FEAT_CONNECTION:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_CONNECTION\n");
+ break;
+ case USB_PORT_FEAT_ENABLE:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_ENABLE\n");
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_SUSPEND\n");
+ break;
+ case USB_PORT_FEAT_OVER_CURRENT:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_OVER_CURRENT\n");
+ break;
+ case USB_PORT_FEAT_RESET:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_RESET\n");
+ set_bits = USB_PORT_STAT_ENABLE | (USB_PORT_STAT_C_RESET<<16);
+ clear_bits = USB_PORT_STAT_RESET;
+ ozhcd->ports[port_id-1].bus_addr = 0;
+ break;
+ case USB_PORT_FEAT_POWER:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_POWER\n");
+ set_bits |= USB_PORT_STAT_POWER;
+ break;
+ case USB_PORT_FEAT_LOWSPEED:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_LOWSPEED\n");
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_CONNECTION\n");
+ break;
+ case USB_PORT_FEAT_C_ENABLE:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_ENABLE\n");
+ break;
+ case USB_PORT_FEAT_C_SUSPEND:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_SUSPEND\n");
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_OVER_CURRENT\n");
+ break;
+ case USB_PORT_FEAT_C_RESET:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_RESET\n");
+ break;
+ case USB_PORT_FEAT_TEST:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_TEST\n");
+ break;
+ case USB_PORT_FEAT_INDICATOR:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_INDICATOR\n");
+ break;
+ default:
+ oz_trace2(OZ_TRACE_HUB, "Other %d\n", wvalue);
+ break;
+ }
+ if (set_bits || clear_bits) {
+ spin_lock_bh(&port->port_lock);
+ port->status &= ~clear_bits;
+ port->status |= set_bits;
+ spin_unlock_bh(&port->port_lock);
+ }
+ oz_trace2(OZ_TRACE_HUB, "Port[%d] status = 0x%x\n", port_id,
+ port->status);
+ return err;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_clear_port_feature(struct usb_hcd *hcd, u16 wvalue, u16 windex)
+{
+ struct oz_port *port;
+ int err = 0;
+ u8 port_id = (u8)windex;
+ struct oz_hcd *ozhcd = oz_hcd_private(hcd);
+ unsigned clear_bits = 0;
+ oz_trace2(OZ_TRACE_HUB, "ClearPortFeature\n");
+ if ((port_id < 1) || (port_id > OZ_NB_PORTS))
+ return -EPIPE;
+ port = &ozhcd->ports[port_id-1];
+ switch (wvalue) {
+ case USB_PORT_FEAT_CONNECTION:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_CONNECTION\n");
+ break;
+ case USB_PORT_FEAT_ENABLE:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_ENABLE\n");
+ clear_bits = USB_PORT_STAT_ENABLE;
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_SUSPEND\n");
+ break;
+ case USB_PORT_FEAT_OVER_CURRENT:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_OVER_CURRENT\n");
+ break;
+ case USB_PORT_FEAT_RESET:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_RESET\n");
+ break;
+ case USB_PORT_FEAT_POWER:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_POWER\n");
+ clear_bits |= USB_PORT_STAT_POWER;
+ break;
+ case USB_PORT_FEAT_LOWSPEED:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_LOWSPEED\n");
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_CONNECTION\n");
+ clear_bits = (USB_PORT_STAT_C_CONNECTION << 16);
+ break;
+ case USB_PORT_FEAT_C_ENABLE:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_ENABLE\n");
+ clear_bits = (USB_PORT_STAT_C_ENABLE << 16);
+ break;
+ case USB_PORT_FEAT_C_SUSPEND:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_SUSPEND\n");
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_OVER_CURRENT\n");
+ break;
+ case USB_PORT_FEAT_C_RESET:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_C_RESET\n");
+ clear_bits = (USB_PORT_FEAT_C_RESET << 16);
+ break;
+ case USB_PORT_FEAT_TEST:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_TEST\n");
+ break;
+ case USB_PORT_FEAT_INDICATOR:
+ oz_trace2(OZ_TRACE_HUB, "USB_PORT_FEAT_INDICATOR\n");
+ break;
+ default:
+ oz_trace2(OZ_TRACE_HUB, "Other %d\n", wvalue);
+ break;
+ }
+ if (clear_bits) {
+ spin_lock_bh(&port->port_lock);
+ port->status &= ~clear_bits;
+ spin_unlock_bh(&port->port_lock);
+ }
+ oz_trace2(OZ_TRACE_HUB, "Port[%d] status = 0x%x\n", port_id,
+ ozhcd->ports[port_id-1].status);
+ return err;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_get_port_status(struct usb_hcd *hcd, u16 windex, char *buf)
+{
+ struct oz_hcd *ozhcd;
+ u32 status = 0;
+ if ((windex < 1) || (windex > OZ_NB_PORTS))
+ return -EPIPE;
+ ozhcd = oz_hcd_private(hcd);
+ oz_trace2(OZ_TRACE_HUB, "GetPortStatus windex = %d\n", windex);
+ status = ozhcd->ports[windex-1].status;
+ put_unaligned(cpu_to_le32(status), (__le32 *)buf);
+ oz_trace2(OZ_TRACE_HUB, "Port[%d] status = %x\n", windex, status);
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_hcd_hub_control(struct usb_hcd *hcd, u16 req_type, u16 wvalue,
+ u16 windex, char *buf, u16 wlength)
+{
+ int err = 0;
+ oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_control()\n");
+ switch (req_type) {
+ case ClearHubFeature:
+ oz_trace2(OZ_TRACE_HUB, "ClearHubFeature: %d\n", req_type);
+ break;
+ case ClearPortFeature:
+ err = oz_clear_port_feature(hcd, wvalue, windex);
+ break;
+ case GetHubDescriptor:
+ oz_get_hub_descriptor(hcd, (struct usb_hub_descriptor *)buf);
+ break;
+ case GetHubStatus:
+ oz_trace2(OZ_TRACE_HUB, "GetHubStatus: req_type = 0x%x\n",
+ req_type);
+ put_unaligned(__constant_cpu_to_le32(0), (__le32 *)buf);
+ break;
+ case GetPortStatus:
+ err = oz_get_port_status(hcd, windex, buf);
+ break;
+ case SetHubFeature:
+ oz_trace2(OZ_TRACE_HUB, "SetHubFeature: %d\n", req_type);
+ break;
+ case SetPortFeature:
+ err = oz_set_port_feature(hcd, wvalue, windex);
+ break;
+ default:
+ oz_trace2(OZ_TRACE_HUB, "Other: %d\n", req_type);
+ break;
+ }
+ return err;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_hcd_bus_suspend(struct usb_hcd *hcd)
+{
+ struct oz_hcd *ozhcd;
+ oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_suspend()\n");
+ ozhcd = oz_hcd_private(hcd);
+ spin_lock_bh(&ozhcd->hcd_lock);
+ hcd->state = HC_STATE_SUSPENDED;
+ ozhcd->flags |= OZ_HDC_F_SUSPENDED;
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_hcd_bus_resume(struct usb_hcd *hcd)
+{
+ struct oz_hcd *ozhcd;
+ oz_trace2(OZ_TRACE_HUB, "oz_hcd_hub_resume()\n");
+ ozhcd = oz_hcd_private(hcd);
+ spin_lock_bh(&ozhcd->hcd_lock);
+ ozhcd->flags &= ~OZ_HDC_F_SUSPENDED;
+ hcd->state = HC_STATE_RUNNING;
+ spin_unlock_bh(&ozhcd->hcd_lock);
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ */
+static void oz_plat_shutdown(struct platform_device *dev)
+{
+ oz_trace("oz_plat_shutdown()\n");
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+static int oz_plat_probe(struct platform_device *dev)
+{
+ int i;
+ int err;
+ struct usb_hcd *hcd;
+ struct oz_hcd *ozhcd;
+ oz_trace("oz_plat_probe()\n");
+ hcd = usb_create_hcd(&g_oz_hc_drv, &dev->dev, dev_name(&dev->dev));
+ if (hcd == 0) {
+ oz_trace("Failed to created hcd object OK\n");
+ return -ENOMEM;
+ }
+ ozhcd = oz_hcd_private(hcd);
+ memset(ozhcd, 0, sizeof(*ozhcd));
+ INIT_LIST_HEAD(&ozhcd->urb_pending_list);
+ INIT_LIST_HEAD(&ozhcd->urb_cancel_list);
+ INIT_LIST_HEAD(&ozhcd->orphanage);
+ ozhcd->hcd = hcd;
+ ozhcd->conn_port = -1;
+ spin_lock_init(&ozhcd->hcd_lock);
+ for (i = 0; i < OZ_NB_PORTS; i++) {
+ struct oz_port *port = &ozhcd->ports[i];
+ port->ozhcd = ozhcd;
+ port->flags = 0;
+ port->status = 0;
+ port->bus_addr = 0xff;
+ spin_lock_init(&port->port_lock);
+ }
+ err = usb_add_hcd(hcd, 0, 0);
+ if (err) {
+ oz_trace("Failed to add hcd object OK\n");
+ usb_put_hcd(hcd);
+ return -1;
+ }
+ spin_lock_bh(&g_hcdlock);
+ g_ozhcd = ozhcd;
+ spin_unlock_bh(&g_hcdlock);
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static int oz_plat_remove(struct platform_device *dev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(dev);
+ struct oz_hcd *ozhcd;
+ oz_trace("oz_plat_remove()\n");
+ if (hcd == 0)
+ return -1;
+ ozhcd = oz_hcd_private(hcd);
+ spin_lock_bh(&g_hcdlock);
+ if (ozhcd == g_ozhcd)
+ g_ozhcd = 0;
+ spin_unlock_bh(&g_hcdlock);
+ oz_trace("Clearing orphanage\n");
+ oz_hcd_clear_orphanage(ozhcd, -EPIPE);
+ oz_trace("Removing hcd\n");
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+ oz_empty_link_pool();
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static int oz_plat_suspend(struct platform_device *dev, pm_message_t msg)
+{
+ oz_trace("oz_plat_suspend()\n");
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: unknown
+ */
+static int oz_plat_resume(struct platform_device *dev)
+{
+ oz_trace("oz_plat_resume()\n");
+ return 0;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+int oz_hcd_init(void)
+{
+ int err;
+ if (usb_disabled())
+ return -ENODEV;
+ tasklet_init(&g_urb_process_tasklet, oz_urb_process_tasklet, 0);
+ tasklet_init(&g_urb_cancel_tasklet, oz_urb_cancel_tasklet, 0);
+ err = platform_driver_register(&g_oz_plat_drv);
+ oz_trace("platform_driver_register() returned %d\n", err);
+ if (err)
+ goto error;
+ g_plat_dev = platform_device_alloc(OZ_PLAT_DEV_NAME, -1);
+ if (g_plat_dev == 0) {
+ err = -ENOMEM;
+ goto error1;
+ }
+ oz_trace("platform_device_alloc() succeeded\n");
+ err = platform_device_add(g_plat_dev);
+ if (err)
+ goto error2;
+ oz_trace("platform_device_add() succeeded\n");
+ return 0;
+error2:
+ platform_device_put(g_plat_dev);
+error1:
+ platform_driver_unregister(&g_oz_plat_drv);
+error:
+ tasklet_disable(&g_urb_process_tasklet);
+ tasklet_disable(&g_urb_cancel_tasklet);
+ oz_trace("oz_hcd_init() failed %d\n", err);
+ return err;
+}
+/*------------------------------------------------------------------------------
+ * Context: process
+ */
+void oz_hcd_term(void)
+{
+ tasklet_disable(&g_urb_process_tasklet);
+ tasklet_disable(&g_urb_cancel_tasklet);
+ platform_device_unregister(g_plat_dev);
+ platform_driver_unregister(&g_oz_plat_drv);
+ oz_trace("Pending urbs:%d\n", atomic_read(&g_pending_urbs));
+}
diff --git a/drivers/staging/ozwpan/ozhcd.h b/drivers/staging/ozwpan/ozhcd.h
new file mode 100644
index 00000000000..9b30dfd0997
--- /dev/null
+++ b/drivers/staging/ozwpan/ozhcd.h
@@ -0,0 +1,15 @@
+/* -----------------------------------------------------------------------------
+ * Copyright (c) 2011 Ozmo Inc
+ * Released under the GNU General Public License Version 2 (GPLv2).
+ * ---------------------------------------------------------------------------*/
+#ifndef _OZHCD_H
+#define _OZHCD_H
+
+int oz_hcd_init(void);
+void oz_hcd_term(void);
+void *oz_hcd_pd_arrived(void *ctx);
+void oz_hcd_pd_departed(void *ctx);
+void oz_hcd_pd_reset(void *hpd, void *hport);
+
+#endif /* _OZHCD_H */
+