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path: root/drivers/usb/core/hcd.c
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Diffstat (limited to 'drivers/usb/core/hcd.c')
-rw-r--r--drivers/usb/core/hcd.c348
1 files changed, 201 insertions, 147 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 266e9e0..79422a3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -519,119 +519,120 @@ error:
/*-------------------------------------------------------------------------*/
/*
- * Root Hub interrupt transfers are synthesized with a timer.
- * Completions are called in_interrupt() but not in_irq().
+ * Root Hub interrupt transfers are polled using a timer if the
+ * driver requests it; otherwise the driver is responsible for
+ * calling usb_hcd_poll_rh_status() when an event occurs.
*
- * Note: some root hubs (including common UHCI based designs) can't
- * correctly issue port change IRQs. They're the ones that _need_ a
- * timer; most other root hubs don't. Some systems could save a
- * lot of battery power by eliminating these root hub timer IRQs.
+ * Completions are called in_interrupt(), but they may or may not
+ * be in_irq().
*/
+void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
+{
+ struct urb *urb;
+ int length;
+ unsigned long flags;
+ char buffer[4]; /* Any root hubs with > 31 ports? */
-static void rh_report_status (unsigned long ptr);
+ if (!hcd->uses_new_polling && !hcd->status_urb)
+ return;
-static int rh_status_urb (struct usb_hcd *hcd, struct urb *urb)
-{
- int len = 1 + (urb->dev->maxchild / 8);
+ length = hcd->driver->hub_status_data(hcd, buffer);
+ if (length > 0) {
- /* rh_timer protected by hcd_data_lock */
- if (hcd->rh_timer.data || urb->transfer_buffer_length < len) {
- dev_dbg (hcd->self.controller,
- "not queuing rh status urb, stat %d\n",
- urb->status);
- return -EINVAL;
+ /* try to complete the status urb */
+ local_irq_save (flags);
+ spin_lock(&hcd_root_hub_lock);
+ urb = hcd->status_urb;
+ if (urb) {
+ spin_lock(&urb->lock);
+ if (urb->status == -EINPROGRESS) {
+ hcd->poll_pending = 0;
+ hcd->status_urb = NULL;
+ urb->status = 0;
+ urb->hcpriv = NULL;
+ urb->actual_length = length;
+ memcpy(urb->transfer_buffer, buffer, length);
+ } else /* urb has been unlinked */
+ length = 0;
+ spin_unlock(&urb->lock);
+ } else
+ length = 0;
+ spin_unlock(&hcd_root_hub_lock);
+
+ /* local irqs are always blocked in completions */
+ if (length > 0)
+ usb_hcd_giveback_urb (hcd, urb, NULL);
+ else
+ hcd->poll_pending = 1;
+ local_irq_restore (flags);
}
- init_timer (&hcd->rh_timer);
- hcd->rh_timer.function = rh_report_status;
- hcd->rh_timer.data = (unsigned long) urb;
- /* USB 2.0 spec says 256msec; this is close enough */
- hcd->rh_timer.expires = jiffies + HZ/4;
- add_timer (&hcd->rh_timer);
- urb->hcpriv = hcd; /* nonzero to indicate it's queued */
- return 0;
+ /* The USB 2.0 spec says 256 ms. This is close enough and won't
+ * exceed that limit if HZ is 100. */
+ if (hcd->uses_new_polling ? hcd->poll_rh :
+ (length == 0 && hcd->status_urb != NULL))
+ mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250));
}
+EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
/* timer callback */
+static void rh_timer_func (unsigned long _hcd)
+{
+ usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
+}
-static void rh_report_status (unsigned long ptr)
+/*-------------------------------------------------------------------------*/
+
+static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
{
- struct urb *urb;
- struct usb_hcd *hcd;
- int length = 0;
+ int retval;
unsigned long flags;
+ int len = 1 + (urb->dev->maxchild / 8);
- urb = (struct urb *) ptr;
- local_irq_save (flags);
- spin_lock (&urb->lock);
+ spin_lock_irqsave (&hcd_root_hub_lock, flags);
+ if (urb->status != -EINPROGRESS) /* already unlinked */
+ retval = urb->status;
+ else if (hcd->status_urb || urb->transfer_buffer_length < len) {
+ dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
+ retval = -EINVAL;
+ } else {
+ hcd->status_urb = urb;
+ urb->hcpriv = hcd; /* indicate it's queued */
- /* do nothing if the urb's been unlinked */
- if (!urb->dev
- || urb->status != -EINPROGRESS
- || (hcd = urb->dev->bus->hcpriv) == NULL) {
- spin_unlock (&urb->lock);
- local_irq_restore (flags);
- return;
- }
+ if (!hcd->uses_new_polling)
+ mod_timer (&hcd->rh_timer, jiffies +
+ msecs_to_jiffies(250));
- /* complete the status urb, or retrigger the timer */
- spin_lock (&hcd_data_lock);
- if (urb->dev->state == USB_STATE_CONFIGURED) {
- length = hcd->driver->hub_status_data (
- hcd, urb->transfer_buffer);
- if (length > 0) {
- hcd->rh_timer.data = 0;
- urb->actual_length = length;
- urb->status = 0;
- urb->hcpriv = NULL;
- } else
- mod_timer (&hcd->rh_timer, jiffies + HZ/4);
+ /* If a status change has already occurred, report it ASAP */
+ else if (hcd->poll_pending)
+ mod_timer (&hcd->rh_timer, jiffies);
+ retval = 0;
}
- spin_unlock (&hcd_data_lock);
- spin_unlock (&urb->lock);
-
- /* local irqs are always blocked in completions */
- if (length > 0)
- usb_hcd_giveback_urb (hcd, urb, NULL);
- local_irq_restore (flags);
+ spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
+ return retval;
}
-/*-------------------------------------------------------------------------*/
-
static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
{
- if (usb_pipeint (urb->pipe)) {
- int retval;
- unsigned long flags;
-
- spin_lock_irqsave (&hcd_data_lock, flags);
- retval = rh_status_urb (hcd, urb);
- spin_unlock_irqrestore (&hcd_data_lock, flags);
- return retval;
- }
+ if (usb_pipeint (urb->pipe))
+ return rh_queue_status (hcd, urb);
if (usb_pipecontrol (urb->pipe))
return rh_call_control (hcd, urb);
- else
- return -EINVAL;
+ return -EINVAL;
}
/*-------------------------------------------------------------------------*/
+/* Asynchronous unlinks of root-hub control URBs are legal, but they
+ * don't do anything. Status URB unlinks must be made in process context
+ * with interrupts enabled.
+ */
static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
{
- unsigned long flags;
-
- /* note: always a synchronous unlink */
- if ((unsigned long) urb == hcd->rh_timer.data) {
- del_timer_sync (&hcd->rh_timer);
- hcd->rh_timer.data = 0;
+ if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
+ if (in_interrupt())
+ return 0; /* nothing to do */
- local_irq_save (flags);
- urb->hcpriv = NULL;
- usb_hcd_giveback_urb (hcd, urb, NULL);
- local_irq_restore (flags);
-
- } else if (usb_pipeendpoint(urb->pipe) == 0) {
spin_lock_irq(&urb->lock); /* from usb_kill_urb */
++urb->reject;
spin_unlock_irq(&urb->lock);
@@ -642,8 +643,22 @@ static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
spin_lock_irq(&urb->lock);
--urb->reject;
spin_unlock_irq(&urb->lock);
- } else
- return -EINVAL;
+
+ } else { /* Status URB */
+ if (!hcd->uses_new_polling)
+ del_timer_sync (&hcd->rh_timer);
+ local_irq_disable ();
+ spin_lock (&hcd_root_hub_lock);
+ if (urb == hcd->status_urb) {
+ hcd->status_urb = NULL;
+ urb->hcpriv = NULL;
+ } else
+ urb = NULL; /* wasn't fully queued */
+ spin_unlock (&hcd_root_hub_lock);
+ if (urb)
+ usb_hcd_giveback_urb (hcd, urb, NULL);
+ local_irq_enable ();
+ }
return 0;
}
@@ -651,50 +666,45 @@ static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
/*-------------------------------------------------------------------------*/
/* exported only within usbcore */
-struct usb_bus *usb_bus_get (struct usb_bus *bus)
+struct usb_bus *usb_bus_get(struct usb_bus *bus)
{
- struct class_device *tmp;
+ if (bus)
+ kref_get(&bus->kref);
+ return bus;
+}
- if (!bus)
- return NULL;
+static void usb_host_release(struct kref *kref)
+{
+ struct usb_bus *bus = container_of(kref, struct usb_bus, kref);
- tmp = class_device_get(&bus->class_dev);
- if (tmp)
- return to_usb_bus(tmp);
- else
- return NULL;
+ if (bus->release)
+ bus->release(bus);
}
/* exported only within usbcore */
-void usb_bus_put (struct usb_bus *bus)
+void usb_bus_put(struct usb_bus *bus)
{
if (bus)
- class_device_put(&bus->class_dev);
+ kref_put(&bus->kref, usb_host_release);
}
/*-------------------------------------------------------------------------*/
-static void usb_host_release(struct class_device *class_dev)
-{
- struct usb_bus *bus = to_usb_bus(class_dev);
-
- if (bus->release)
- bus->release(bus);
-}
-
-static struct class usb_host_class = {
- .name = "usb_host",
- .release = &usb_host_release,
-};
+static struct class *usb_host_class;
int usb_host_init(void)
{
- return class_register(&usb_host_class);
+ int retval = 0;
+
+ usb_host_class = class_create(THIS_MODULE, "usb_host");
+ if (IS_ERR(usb_host_class))
+ retval = PTR_ERR(usb_host_class);
+ return retval;
}
void usb_host_cleanup(void)
{
- class_unregister(&usb_host_class);
+ class_destroy(usb_host_class);
}
/**
@@ -719,8 +729,7 @@ static void usb_bus_init (struct usb_bus *bus)
INIT_LIST_HEAD (&bus->bus_list);
- class_device_initialize(&bus->class_dev);
- bus->class_dev.class = &usb_host_class;
+ kref_init(&bus->kref);
}
/**
@@ -761,7 +770,6 @@ struct usb_bus *usb_alloc_bus (struct usb_operations *op)
static int usb_register_bus(struct usb_bus *bus)
{
int busnum;
- int retval;
down (&usb_bus_list_lock);
busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
@@ -774,15 +782,15 @@ static int usb_register_bus(struct usb_bus *bus)
return -E2BIG;
}
- snprintf(bus->class_dev.class_id, BUS_ID_SIZE, "usb%d", busnum);
- bus->class_dev.dev = bus->controller;
- retval = class_device_add(&bus->class_dev);
- if (retval) {
+ bus->class_dev = class_device_create(usb_host_class, MKDEV(0,0), bus->controller, "usb%d", busnum);
+ if (IS_ERR(bus->class_dev)) {
clear_bit(busnum, busmap.busmap);
up(&usb_bus_list_lock);
- return retval;
+ return PTR_ERR(bus->class_dev);
}
+ class_set_devdata(bus->class_dev, bus);
+
/* Add it to the local list of buses */
list_add (&bus->bus_list, &usb_bus_list);
up (&usb_bus_list_lock);
@@ -820,34 +828,26 @@ static void usb_deregister_bus (struct usb_bus *bus)
clear_bit (bus->busnum, busmap.busmap);
- class_device_del(&bus->class_dev);
+ class_device_unregister(bus->class_dev);
}
/**
- * usb_hcd_register_root_hub - called by HCD to register its root hub
+ * register_root_hub - called by usb_add_hcd() to register a root hub
* @usb_dev: the usb root hub device to be registered.
* @hcd: host controller for this root hub
*
- * The USB host controller calls this function to register the root hub
- * properly with the USB subsystem. It sets up the device properly in
- * the device tree and stores the root_hub pointer in the bus structure,
- * then calls usb_new_device() to register the usb device. It also
- * assigns the root hub's USB address (always 1).
+ * This function registers the root hub with the USB subsystem. It sets up
+ * the device properly in the device tree and stores the root_hub pointer
+ * in the bus structure, then calls usb_new_device() to register the usb
+ * device. It also assigns the root hub's USB address (always 1).
*/
-int usb_hcd_register_root_hub (struct usb_device *usb_dev, struct usb_hcd *hcd)
+static int register_root_hub (struct usb_device *usb_dev,
+ struct usb_hcd *hcd)
{
struct device *parent_dev = hcd->self.controller;
const int devnum = 1;
int retval;
- /* hcd->driver->start() reported can_wakeup, probably with
- * assistance from board's boot firmware.
- * NOTE: normal devices won't enable wakeup by default.
- */
- if (hcd->can_wakeup)
- dev_dbg (parent_dev, "supports USB remote wakeup\n");
- hcd->remote_wakeup = hcd->can_wakeup;
-
usb_dev->devnum = devnum;
usb_dev->bus->devnum_next = devnum + 1;
memset (&usb_dev->bus->devmap.devicemap, 0,
@@ -890,7 +890,16 @@ int usb_hcd_register_root_hub (struct usb_device *usb_dev, struct usb_hcd *hcd)
return retval;
}
-EXPORT_SYMBOL_GPL(usb_hcd_register_root_hub);
+
+void usb_enable_root_hub_irq (struct usb_bus *bus)
+{
+ struct usb_hcd *hcd;
+
+ hcd = container_of (bus, struct usb_hcd, self);
+ if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
+ hcd->state != HC_STATE_HALT)
+ hcd->driver->hub_irq_enable (hcd);
+}
/*-------------------------------------------------------------------------*/
@@ -930,9 +939,9 @@ long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
case USB_SPEED_HIGH: /* ISOC or INTR */
// FIXME adjust for input vs output
if (isoc)
- tmp = HS_USECS (bytecount);
+ tmp = HS_NSECS_ISO (bytecount);
else
- tmp = HS_USECS_ISO (bytecount);
+ tmp = HS_NSECS (bytecount);
return tmp;
default:
pr_debug ("%s: bogus device speed!\n", usbcore_name);
@@ -1103,7 +1112,7 @@ static void urb_unlink (struct urb *urb)
* expects usb_submit_urb() to have sanity checked and conditioned all
* inputs in the urb
*/
-static int hcd_submit_urb (struct urb *urb, int mem_flags)
+static int hcd_submit_urb (struct urb *urb, unsigned mem_flags)
{
int status;
struct usb_hcd *hcd = urb->dev->bus->hcpriv;
@@ -1355,7 +1364,8 @@ hcd_endpoint_disable (struct usb_device *udev, struct usb_host_endpoint *ep)
hcd = udev->bus->hcpriv;
- WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT);
+ WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
+ udev->state != USB_STATE_NOTATTACHED);
local_irq_disable ();
@@ -1619,6 +1629,8 @@ void usb_hc_died (struct usb_hcd *hcd)
spin_lock_irqsave (&hcd_root_hub_lock, flags);
if (hcd->rh_registered) {
+ hcd->poll_rh = 0;
+ del_timer(&hcd->rh_timer);
/* make khubd clean up old urbs and devices */
usb_set_device_state (hcd->self.root_hub,
@@ -1672,6 +1684,8 @@ struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
hcd->self.bus_name = bus_name;
init_timer(&hcd->rh_timer);
+ hcd->rh_timer.function = rh_timer_func;
+ hcd->rh_timer.data = (unsigned long) hcd;
hcd->driver = driver;
hcd->product_desc = (driver->product_desc) ? driver->product_desc :
@@ -1701,7 +1715,8 @@ EXPORT_SYMBOL (usb_put_hcd);
int usb_add_hcd(struct usb_hcd *hcd,
unsigned int irqnum, unsigned long irqflags)
{
- int retval;
+ int retval;
+ struct usb_device *rhdev;
dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
@@ -1717,7 +1732,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
}
if ((retval = usb_register_bus(&hcd->self)) < 0)
- goto err1;
+ goto err_register_bus;
if (hcd->driver->irq) {
char buf[8], *bufp = buf;
@@ -1734,7 +1749,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
hcd->irq_descr, hcd)) != 0) {
dev_err(hcd->self.controller,
"request interrupt %s failed\n", bufp);
- goto err2;
+ goto err_request_irq;
}
hcd->irq = irqnum;
dev_info(hcd->self.controller, "irq %s, %s 0x%08llx\n", bufp,
@@ -1750,19 +1765,55 @@ int usb_add_hcd(struct usb_hcd *hcd,
(unsigned long long)hcd->rsrc_start);
}
+ /* Allocate the root hub before calling hcd->driver->start(),
+ * but don't register it until afterward so that the hardware
+ * is running.
+ */
+ if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
+ dev_err(hcd->self.controller, "unable to allocate root hub\n");
+ retval = -ENOMEM;
+ goto err_allocate_root_hub;
+ }
+ rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
+ USB_SPEED_FULL;
+
+ /* Although in principle hcd->driver->start() might need to use rhdev,
+ * none of the current drivers do.
+ */
if ((retval = hcd->driver->start(hcd)) < 0) {
dev_err(hcd->self.controller, "startup error %d\n", retval);
- goto err3;
+ goto err_hcd_driver_start;
}
+ /* hcd->driver->start() reported can_wakeup, probably with
+ * assistance from board's boot firmware.
+ * NOTE: normal devices won't enable wakeup by default.
+ */
+ if (hcd->can_wakeup)
+ dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
+ hcd->remote_wakeup = hcd->can_wakeup;
+
+ if ((retval = register_root_hub(rhdev, hcd)) != 0)
+ goto err_register_root_hub;
+
+ if (hcd->uses_new_polling && hcd->poll_rh)
+ usb_hcd_poll_rh_status(hcd);
return retval;
- err3:
+ err_register_root_hub:
+ hcd->driver->stop(hcd);
+
+ err_hcd_driver_start:
+ usb_put_dev(rhdev);
+
+ err_allocate_root_hub:
if (hcd->irq >= 0)
free_irq(irqnum, hcd);
- err2:
+
+ err_request_irq:
usb_deregister_bus(&hcd->self);
- err1:
+
+ err_register_bus:
hcd_buffer_destroy(hcd);
return retval;
}
@@ -1789,6 +1840,9 @@ void usb_remove_hcd(struct usb_hcd *hcd)
spin_unlock_irq (&hcd_root_hub_lock);
usb_disconnect(&hcd->self.root_hub);
+ hcd->poll_rh = 0;
+ del_timer_sync(&hcd->rh_timer);
+
hcd->driver->stop(hcd);
hcd->state = HC_STATE_HALT;
@@ -1801,7 +1855,7 @@ EXPORT_SYMBOL (usb_remove_hcd);
/*-------------------------------------------------------------------------*/
-#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
+#if defined(CONFIG_USB_MON)
struct usb_mon_operations *mon_ops;