return 0;
}
+/*
+ * Cancel any pending scheduled resets
+ *
+ * [see usb_queue_reset_device()]
+ *
+ * Called after unconfiguring / when releasing interfaces. See
+ * comments in __usb_queue_reset_device() regarding
+ * udev->reset_running.
+ */
+static void usb_cancel_queued_reset(struct usb_interface *iface)
+{
+ if (iface->reset_running == 0)
+ cancel_work_sync(&iface->reset_ws);
+}
/* called from driver core with dev locked */
static int usb_probe_interface(struct device *dev)
mark_quiesced(intf);
intf->needs_remote_wakeup = 0;
intf->condition = USB_INTERFACE_UNBOUND;
+ usb_cancel_queued_reset(intf);
} else
intf->condition = USB_INTERFACE_BOUND;
* supports "soft" unbinding.
*/
if (!driver->soft_unbind)
- usb_disable_interface(udev, intf);
+ usb_disable_interface(udev, intf, false);
driver->disconnect(intf);
+ usb_cancel_queued_reset(intf);
/* Reset other interface state.
* We cannot do a Set-Interface if the device is suspended or
* altsetting means creating new endpoint device entries).
* When either of these happens, defer the Set-Interface.
*/
- if (intf->cur_altsetting->desc.bAlternateSetting == 0)
- ; /* Already in altsetting 0 so skip Set-Interface */
- else if (!error && intf->dev.power.status == DPM_ON)
+ if (intf->cur_altsetting->desc.bAlternateSetting == 0) {
+ /* Already in altsetting 0 so skip Set-Interface.
+ * Just re-enable it without affecting the endpoint toggles.
+ */
+ usb_enable_interface(udev, intf, false);
+ } else if (!error && intf->dev.power.status == DPM_ON)
usb_set_interface(udev, intf->altsetting[0].
desc.bInterfaceNumber, 0);
else
if (device_is_registered(dev)) {
iface->condition = USB_INTERFACE_UNBINDING;
device_release_driver(dev);
+ } else {
+ iface->condition = USB_INTERFACE_UNBOUND;
+ usb_cancel_queued_reset(iface);
}
-
dev->driver = NULL;
usb_set_intfdata(iface, NULL);
}
/* Caller has locked udev's pm_mutex */
-static int usb_resume_device(struct usb_device *udev)
+static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
{
struct usb_device_driver *udriver;
int status = 0;
udev->reset_resume = 1;
udriver = to_usb_device_driver(udev->dev.driver);
- status = udriver->resume(udev);
+ status = udriver->resume(udev, msg);
done:
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
if (udev->state == USB_STATE_NOTATTACHED || !is_active(intf))
goto done;
- if (intf->condition == USB_INTERFACE_UNBOUND) /* This can't happen */
+ /* This can happen; see usb_driver_release_interface() */
+ if (intf->condition == USB_INTERFACE_UNBOUND)
goto done;
driver = to_usb_driver(intf->dev.driver);
status = driver->suspend(intf, msg);
if (status == 0)
mark_quiesced(intf);
- else if (!udev->auto_pm)
+ else if (!(msg.event & PM_EVENT_AUTO))
dev_err(&intf->dev, "%s error %d\n",
"suspend", status);
} else {
/* Caller has locked intf's usb_device's pm_mutex */
static int usb_resume_interface(struct usb_device *udev,
- struct usb_interface *intf, int reset_resume)
+ struct usb_interface *intf, pm_message_t msg, int reset_resume)
{
struct usb_driver *driver;
int status = 0;
if (reschedule) {
if (!timer_pending(&udev->autosuspend.timer)) {
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
- round_jiffies_relative(suspend_time - j));
+ round_jiffies_up_relative(suspend_time - j));
}
return -EAGAIN;
}
* all the interfaces which were suspended are resumed so that they remain
* in the same state as the device.
*
- * If an autosuspend is in progress (@udev->auto_pm is set), the routine
- * checks first to make sure that neither the device itself or any of its
- * active interfaces is in use (pm_usage_cnt is greater than 0). If they
- * are, the autosuspend fails.
+ * If an autosuspend is in progress the routine checks first to make sure
+ * that neither the device itself or any of its active interfaces is in use
+ * (pm_usage_cnt is greater than 0). If they are, the autosuspend fails.
*
* If the suspend succeeds, the routine recursively queues an autosuspend
* request for @udev's parent device, thereby propagating the change up
udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
- if (udev->auto_pm) {
+ if (msg.event & PM_EVENT_AUTO) {
status = autosuspend_check(udev, 0);
if (status < 0)
goto done;
/* If the suspend failed, resume interfaces that did get suspended */
if (status != 0) {
+ pm_message_t msg2;
+
+ msg2.event = msg.event ^ (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
while (--i >= 0) {
intf = udev->actconfig->interface[i];
- usb_resume_interface(udev, intf, 0);
+ usb_resume_interface(udev, intf, msg2, 0);
}
/* Try another autosuspend when the interfaces aren't busy */
- if (udev->auto_pm)
+ if (msg.event & PM_EVENT_AUTO)
autosuspend_check(udev, status == -EBUSY);
/* If the suspend succeeded then prevent any more URB submissions,
/**
* usb_resume_both - resume a USB device and its interfaces
* @udev: the usb_device to resume
+ * @msg: Power Management message describing this state transition
*
* This is the central routine for resuming USB devices. It calls the
* the resume method for @udev and then calls the resume methods for all
*
* This routine can run only in process context.
*/
-static int usb_resume_both(struct usb_device *udev)
+static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
{
int status = 0;
int i;
/* Propagate the resume up the tree, if necessary */
if (udev->state == USB_STATE_SUSPENDED) {
- if (udev->auto_pm && udev->autoresume_disabled) {
+ if ((msg.event & PM_EVENT_AUTO) &&
+ udev->autoresume_disabled) {
status = -EPERM;
goto done;
}
if (parent) {
status = usb_autoresume_device(parent);
if (status == 0) {
- status = usb_resume_device(udev);
+ status = usb_resume_device(udev, msg);
if (status || udev->state ==
USB_STATE_NOTATTACHED) {
usb_autosuspend_device(parent);
/* We can't progagate beyond the USB subsystem,
* so if a root hub's controller is suspended
* then we're stuck. */
- status = usb_resume_device(udev);
+ status = usb_resume_device(udev, msg);
}
} else if (udev->reset_resume)
- status = usb_resume_device(udev);
+ status = usb_resume_device(udev, msg);
if (status == 0 && udev->actconfig) {
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
intf = udev->actconfig->interface[i];
- usb_resume_interface(udev, intf, udev->reset_resume);
+ usb_resume_interface(udev, intf, msg,
+ udev->reset_resume);
}
}
udev->last_busy = jiffies;
if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
if (udev->state == USB_STATE_SUSPENDED)
- status = usb_resume_both(udev);
+ status = usb_resume_both(udev, PMSG_AUTO_RESUME);
if (status != 0)
udev->pm_usage_cnt -= inc_usage_cnt;
else if (inc_usage_cnt)
udev->last_busy = jiffies;
} else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
- status = usb_suspend_both(udev, PMSG_SUSPEND);
+ status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
}
usb_pm_unlock(udev);
return status;
usb_autopm_do_device(udev, 0);
}
+/* usb_autoresume_work - callback routine to autoresume a USB device */
+void usb_autoresume_work(struct work_struct *work)
+{
+ struct usb_device *udev =
+ container_of(work, struct usb_device, autoresume);
+
+ /* Wake it up, let the drivers do their thing, and then put it
+ * back to sleep.
+ */
+ if (usb_autopm_do_device(udev, 1) == 0)
+ usb_autopm_do_device(udev, -1);
+}
+
/**
* usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
* @udev: the usb_device to autosuspend
udev->last_busy = jiffies;
if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) {
if (udev->state == USB_STATE_SUSPENDED)
- status = usb_resume_both(udev);
+ status = usb_resume_both(udev,
+ PMSG_AUTO_RESUME);
if (status != 0)
intf->pm_usage_cnt -= inc_usage_cnt;
else
udev->last_busy = jiffies;
} else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) {
- status = usb_suspend_both(udev, PMSG_SUSPEND);
+ status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
}
}
usb_pm_unlock(udev);
}
EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
+/**
+ * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be decremented
+ *
+ * This routine does essentially the same thing as
+ * usb_autopm_put_interface(): it decrements @intf's usage counter and
+ * queues a delayed autosuspend request if the counter is <= 0. The
+ * difference is that it does not acquire the device's pm_mutex;
+ * callers must handle all synchronization issues themselves.
+ *
+ * Typically a driver would call this routine during an URB's completion
+ * handler, if no more URBs were pending.
+ *
+ * This routine can run in atomic context.
+ */
+void usb_autopm_put_interface_async(struct usb_interface *intf)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+ int status = 0;
+
+ if (intf->condition == USB_INTERFACE_UNBOUND) {
+ status = -ENODEV;
+ } else {
+ udev->last_busy = jiffies;
+ --intf->pm_usage_cnt;
+ if (udev->autosuspend_disabled || udev->autosuspend_delay < 0)
+ status = -EPERM;
+ else if (intf->pm_usage_cnt <= 0 &&
+ !timer_pending(&udev->autosuspend.timer)) {
+ queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
+ round_jiffies_up_relative(
+ udev->autosuspend_delay));
+ }
+ }
+ dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
+ __func__, status, intf->pm_usage_cnt);
+}
+EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
+
/**
* usb_autopm_get_interface - increment a USB interface's PM-usage counter
* @intf: the usb_interface whose counter should be incremented
}
EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
+/**
+ * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter
+ * @intf: the usb_interface whose counter should be incremented
+ *
+ * This routine does much the same thing as
+ * usb_autopm_get_interface(): it increments @intf's usage counter and
+ * queues an autoresume request if the result is > 0. The differences
+ * are that it does not acquire the device's pm_mutex (callers must
+ * handle all synchronization issues themselves), and it does not
+ * autoresume the device directly (it only queues a request). After a
+ * successful call, the device will generally not yet be resumed.
+ *
+ * This routine can run in atomic context.
+ */
+int usb_autopm_get_interface_async(struct usb_interface *intf)
+{
+ struct usb_device *udev = interface_to_usbdev(intf);
+ int status = 0;
+
+ if (intf->condition == USB_INTERFACE_UNBOUND)
+ status = -ENODEV;
+ else if (udev->autoresume_disabled)
+ status = -EPERM;
+ else if (++intf->pm_usage_cnt > 0 && udev->state == USB_STATE_SUSPENDED)
+ queue_work(ksuspend_usb_wq, &udev->autoresume);
+ dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
+ __func__, status, intf->pm_usage_cnt);
+ return status;
+}
+EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async);
+
/**
* usb_autopm_set_interface - set a USB interface's autosuspend state
* @intf: the usb_interface whose state should be set
void usb_autosuspend_work(struct work_struct *work)
{}
+void usb_autoresume_work(struct work_struct *work)
+{}
+
#endif /* CONFIG_USB_SUSPEND */
/**
/**
* usb_external_resume_device - external resume of a USB device and its interfaces
* @udev: the usb_device to resume
+ * @msg: Power Management message describing this state transition
*
* This routine handles external resume requests: ones not generated
* internally by a USB driver (autoresume) but rather coming from the user
*
* The caller must hold @udev's device lock.
*/
-int usb_external_resume_device(struct usb_device *udev)
+int usb_external_resume_device(struct usb_device *udev, pm_message_t msg)
{
int status;
usb_pm_lock(udev);
udev->auto_pm = 0;
- status = usb_resume_both(udev);
+ status = usb_resume_both(udev, msg);
udev->last_busy = jiffies;
usb_pm_unlock(udev);
if (status == 0)
return status;
}
-int usb_suspend(struct device *dev, pm_message_t message)
+int usb_suspend(struct device *dev, pm_message_t msg)
{
struct usb_device *udev;
}
udev->skip_sys_resume = 0;
- return usb_external_suspend_device(udev, message);
+ return usb_external_suspend_device(udev, msg);
}
-int usb_resume(struct device *dev)
+int usb_resume(struct device *dev, pm_message_t msg)
{
struct usb_device *udev;
*/
if (udev->skip_sys_resume)
return 0;
- return usb_external_resume_device(udev);
+ return usb_external_resume_device(udev, msg);
}
#endif /* CONFIG_PM */
projects / linux-2.6-omap-h63xx.git / blobdiff