#include "hcd.h"
#include "usb.h"
-#define VERBOSE_DEBUG 0
-
-#if VERBOSE_DEBUG
-#define dev_vdbg dev_dbg
-#else
-#define dev_vdbg(dev, fmt, args...) do { } while (0)
-#endif
#ifdef CONFIG_HOTPLUG
dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
spin_lock(&dynids->lock);
- list_add_tail(&dynids->list, &dynid->node);
+ list_add_tail(&dynid->node, &dynids->list);
spin_unlock(&dynids->lock);
if (get_driver(driver)) {
goto exit;
if (usb_drv->probe != NULL)
- error = sysfs_create_file(&usb_drv->drvwrap.driver.kobj,
- &driver_attr_new_id.attr);
+ error = driver_create_file(&usb_drv->drvwrap.driver,
+ &driver_attr_new_id);
exit:
return error;
}
return;
if (usb_drv->probe != NULL)
- sysfs_remove_file(&usb_drv->drvwrap.driver.kobj,
- &driver_attr_new_id.attr);
+ driver_remove_file(&usb_drv->drvwrap.driver,
+ &driver_attr_new_id);
}
static void usb_free_dynids(struct usb_driver *usb_drv)
static int usb_probe_device(struct device *dev)
{
struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
- struct usb_device *udev;
+ struct usb_device *udev = to_usb_device(dev);
int error = -ENODEV;
- dev_dbg(dev, "%s\n", __FUNCTION__);
-
- if (!is_usb_device(dev)) /* Sanity check */
- return error;
-
- udev = to_usb_device(dev);
+ dev_dbg(dev, "%s\n", __func__);
/* TODO: Add real matching code */
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)
{
struct usb_driver *driver = to_usb_driver(dev->driver);
- struct usb_interface *intf;
- struct usb_device *udev;
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *udev = interface_to_usbdev(intf);
const struct usb_device_id *id;
int error = -ENODEV;
- dev_dbg(dev, "%s\n", __FUNCTION__);
+ dev_dbg(dev, "%s\n", __func__);
- if (is_usb_device(dev)) /* Sanity check */
- return error;
+ intf->needs_binding = 0;
- intf = to_usb_interface(dev);
- udev = interface_to_usbdev(intf);
+ if (usb_device_is_owned(udev))
+ return -ENODEV;
+
+ if (udev->authorized == 0) {
+ dev_err(&intf->dev, "Device is not authorized for usage\n");
+ return -ENODEV;
+ }
id = usb_match_id(intf, driver->id_table);
if (!id)
id = usb_match_dynamic_id(intf, driver);
if (id) {
- dev_dbg(dev, "%s - got id\n", __FUNCTION__);
+ dev_dbg(dev, "%s - got id\n", __func__);
error = usb_autoresume_device(udev);
if (error)
*/
intf->pm_usage_cnt = !(driver->supports_autosuspend);
+ /* Carry out a deferred switch to altsetting 0 */
+ if (intf->needs_altsetting0) {
+ usb_set_interface(udev, intf->altsetting[0].
+ desc.bInterfaceNumber, 0);
+ intf->needs_altsetting0 = 0;
+ }
+
error = driver->probe(intf, id);
if (error) {
mark_quiesced(intf);
intf->needs_remote_wakeup = 0;
intf->condition = USB_INTERFACE_UNBOUND;
+ usb_cancel_queued_reset(intf);
} else
intf->condition = USB_INTERFACE_BOUND;
udev = interface_to_usbdev(intf);
error = usb_autoresume_device(udev);
- /* release all urbs for this interface */
- usb_disable_interface(interface_to_usbdev(intf), intf);
+ /* Terminate all URBs for this interface unless the driver
+ * supports "soft" unbinding.
+ */
+ if (!driver->soft_unbind)
+ usb_disable_interface(udev, intf, false);
driver->disconnect(intf);
+ usb_cancel_queued_reset(intf);
- /* reset other interface state */
- usb_set_interface(interface_to_usbdev(intf),
- intf->altsetting[0].desc.bInterfaceNumber,
- 0);
+ /* Reset other interface state.
+ * We cannot do a Set-Interface if the device is suspended or
+ * if it is prepared for a system sleep (since installing a new
+ * 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.
+ * 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
+ intf->needs_altsetting0 = 1;
usb_set_intfdata(intf, NULL);
intf->condition = USB_INTERFACE_UNBOUND;
* lock.
*/
int usb_driver_claim_interface(struct usb_driver *driver,
- struct usb_interface *iface, void* priv)
+ struct usb_interface *iface, void *priv)
{
struct device *dev = &iface->dev;
struct usb_device *udev = interface_to_usbdev(iface);
dev->driver = &driver->drvwrap.driver;
usb_set_intfdata(iface, priv);
+ iface->needs_binding = 0;
usb_pm_lock(udev);
iface->condition = USB_INTERFACE_BOUND;
return retval;
}
-EXPORT_SYMBOL(usb_driver_claim_interface);
+EXPORT_SYMBOL_GPL(usb_driver_claim_interface);
/**
* usb_driver_release_interface - unbind a driver from an interface
struct usb_interface *iface)
{
struct device *dev = &iface->dev;
- struct usb_device *udev = interface_to_usbdev(iface);
/* this should never happen, don't release something that's not ours */
if (!dev->driver || dev->driver != &driver->drvwrap.driver)
/* don't release from within disconnect() */
if (iface->condition != USB_INTERFACE_BOUND)
return;
+ iface->condition = USB_INTERFACE_UNBINDING;
- /* don't release if the interface hasn't been added yet */
+ /* Release via the driver core only if the interface
+ * has already been registered
+ */
if (device_is_registered(dev)) {
- iface->condition = USB_INTERFACE_UNBINDING;
device_release_driver(dev);
+ } else {
+ down(&dev->sem);
+ usb_unbind_interface(dev);
+ dev->driver = NULL;
+ up(&dev->sem);
}
-
- dev->driver = NULL;
- usb_set_intfdata(iface, NULL);
-
- usb_pm_lock(udev);
- iface->condition = USB_INTERFACE_UNBOUND;
- mark_quiesced(iface);
- iface->needs_remote_wakeup = 0;
- usb_pm_unlock(udev);
}
-EXPORT_SYMBOL(usb_driver_release_interface);
+EXPORT_SYMBOL_GPL(usb_driver_release_interface);
/* returns 0 if no match, 1 if match */
int usb_match_device(struct usb_device *dev, const struct usb_device_id *id)
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
- (id->bDeviceSubClass!= dev->descriptor.bDeviceSubClass))
+ (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass))
return 0;
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
id->driver_info is the way to create an entry that
indicates that the driver want to examine every
device and interface. */
- for (; id->idVendor || id->bDeviceClass || id->bInterfaceClass ||
- id->driver_info; id++) {
+ for (; id->idVendor || id->idProduct || id->bDeviceClass ||
+ id->bInterfaceClass || id->driver_info; id++) {
if (usb_match_one_id(interface, id))
return id;
}
return NULL;
}
-EXPORT_SYMBOL_GPL_FUTURE(usb_match_id);
+EXPORT_SYMBOL_GPL(usb_match_id);
static int usb_device_match(struct device *dev, struct device_driver *drv)
{
/* TODO: Add real matching code */
return 1;
- } else {
+ } else if (is_usb_interface(dev)) {
struct usb_interface *intf;
struct usb_driver *usb_drv;
const struct usb_device_id *id;
}
#ifdef CONFIG_HOTPLUG
-static int usb_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct usb_device *usb_dev;
- int i = 0;
- int length = 0;
-
- if (!dev)
- return -ENODEV;
/* driver is often null here; dev_dbg() would oops */
- pr_debug ("usb %s: uevent\n", dev->bus_id);
+ pr_debug("usb %s: uevent\n", dev_name(dev));
- if (is_usb_device(dev))
+ if (is_usb_device(dev)) {
usb_dev = to_usb_device(dev);
- else {
+ } else if (is_usb_interface(dev)) {
struct usb_interface *intf = to_usb_interface(dev);
+
usb_dev = interface_to_usbdev(intf);
+ } else {
+ return 0;
}
if (usb_dev->devnum < 0) {
- pr_debug ("usb %s: already deleted?\n", dev->bus_id);
+ pr_debug("usb %s: already deleted?\n", dev_name(dev));
return -ENODEV;
}
if (!usb_dev->bus) {
- pr_debug ("usb %s: bus removed?\n", dev->bus_id);
+ pr_debug("usb %s: bus removed?\n", dev_name(dev));
return -ENODEV;
}
* all the device descriptors we don't tell them about. Or
* act as usermode drivers.
*/
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "DEVICE=/proc/bus/usb/%03d/%03d",
+ if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d",
usb_dev->bus->busnum, usb_dev->devnum))
return -ENOMEM;
#endif
/* per-device configurations are common */
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "PRODUCT=%x/%x/%x",
+ if (add_uevent_var(env, "PRODUCT=%x/%x/%x",
le16_to_cpu(usb_dev->descriptor.idVendor),
le16_to_cpu(usb_dev->descriptor.idProduct),
le16_to_cpu(usb_dev->descriptor.bcdDevice)))
return -ENOMEM;
/* class-based driver binding models */
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "TYPE=%d/%d/%d",
+ if (add_uevent_var(env, "TYPE=%d/%d/%d",
usb_dev->descriptor.bDeviceClass,
usb_dev->descriptor.bDeviceSubClass,
usb_dev->descriptor.bDeviceProtocol))
return -ENOMEM;
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "BUSNUM=%03d",
- usb_dev->bus->busnum))
- return -ENOMEM;
-
- if (add_uevent_var(envp, num_envp, &i,
- buffer, buffer_size, &length,
- "DEVNUM=%03d",
- usb_dev->devnum))
- return -ENOMEM;
-
- envp[i] = NULL;
return 0;
}
#else
-static int usb_uevent(struct device *dev, char **envp,
- int num_envp, char *buffer, int buffer_size)
+static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
{
return -ENODEV;
}
return retval;
}
-EXPORT_SYMBOL_GPL_FUTURE(usb_register_driver);
+EXPORT_SYMBOL_GPL(usb_register_driver);
/**
* usb_deregister - unregister a USB interface driver
usbfs_update_special();
}
-EXPORT_SYMBOL_GPL_FUTURE(usb_deregister);
+EXPORT_SYMBOL_GPL(usb_deregister);
+
+/* Forced unbinding of a USB interface driver, either because
+ * it doesn't support pre_reset/post_reset/reset_resume or
+ * because it doesn't support suspend/resume.
+ *
+ * The caller must hold @intf's device's lock, but not its pm_mutex
+ * and not @intf->dev.sem.
+ */
+void usb_forced_unbind_intf(struct usb_interface *intf)
+{
+ struct usb_driver *driver = to_usb_driver(intf->dev.driver);
+
+ dev_dbg(&intf->dev, "forced unbind\n");
+ usb_driver_release_interface(driver, intf);
+
+ /* Mark the interface for later rebinding */
+ intf->needs_binding = 1;
+}
+
+/* Delayed forced unbinding of a USB interface driver and scan
+ * for rebinding.
+ *
+ * The caller must hold @intf's device's lock, but not its pm_mutex
+ * and not @intf->dev.sem.
+ *
+ * Note: Rebinds will be skipped if a system sleep transition is in
+ * progress and the PM "complete" callback hasn't occurred yet.
+ */
+void usb_rebind_intf(struct usb_interface *intf)
+{
+ int rc;
+
+ /* Delayed unbind of an existing driver */
+ if (intf->dev.driver) {
+ struct usb_driver *driver =
+ to_usb_driver(intf->dev.driver);
+
+ dev_dbg(&intf->dev, "forced unbind\n");
+ usb_driver_release_interface(driver, intf);
+ }
+
+ /* Try to rebind the interface */
+ if (intf->dev.power.status == DPM_ON) {
+ intf->needs_binding = 0;
+ rc = device_attach(&intf->dev);
+ if (rc < 0)
+ dev_warn(&intf->dev, "rebind failed: %d\n", rc);
+ }
+}
#ifdef CONFIG_PM
+#define DO_UNBIND 0
+#define DO_REBIND 1
+
+/* Unbind drivers for @udev's interfaces that don't support suspend/resume,
+ * or rebind interfaces that have been unbound, according to @action.
+ *
+ * The caller must hold @udev's device lock.
+ */
+static void do_unbind_rebind(struct usb_device *udev, int action)
+{
+ struct usb_host_config *config;
+ int i;
+ struct usb_interface *intf;
+ struct usb_driver *drv;
+
+ config = udev->actconfig;
+ if (config) {
+ for (i = 0; i < config->desc.bNumInterfaces; ++i) {
+ intf = config->interface[i];
+ switch (action) {
+ case DO_UNBIND:
+ if (intf->dev.driver) {
+ drv = to_usb_driver(intf->dev.driver);
+ if (!drv->suspend || !drv->resume)
+ usb_forced_unbind_intf(intf);
+ }
+ break;
+ case DO_REBIND:
+ if (intf->needs_binding)
+ usb_rebind_intf(intf);
+ break;
+ }
+ }
+ }
+}
+
/* Caller has locked udev's pm_mutex */
static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
{
status = udriver->suspend(udev, msg);
done:
- dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
- if (status == 0)
- udev->dev.power.power_state.event = msg.event;
+ dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
return status;
}
/* 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;
if (udev->state == USB_STATE_NOTATTACHED)
goto done;
- if (udev->state != USB_STATE_SUSPENDED && !udev->reset_resume)
- goto done;
/* Can't resume it if it doesn't have a driver. */
if (udev->dev.driver == NULL) {
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", __FUNCTION__, status);
- if (status == 0) {
+ dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
+ if (status == 0)
udev->autoresume_disabled = 0;
- udev->dev.power.power_state.event = PM_EVENT_ON;
- }
return status;
}
/* Caller has locked intf's usb_device's pm mutex */
-static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg)
+static int usb_suspend_interface(struct usb_device *udev,
+ struct usb_interface *intf, pm_message_t msg)
{
struct usb_driver *driver;
int status = 0;
/* with no hardware, USB interfaces only use FREEZE and ON states */
- if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED ||
- !is_active(intf))
+ 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);
- if (driver->suspend && driver->resume) {
+ if (driver->suspend) {
status = driver->suspend(intf, msg);
if (status == 0)
mark_quiesced(intf);
- else if (!interface_to_usbdev(intf)->auto_pm)
+ else if (!(msg.event & PM_EVENT_AUTO))
dev_err(&intf->dev, "%s error %d\n",
"suspend", status);
} else {
- // FIXME else if there's no suspend method, disconnect...
- // Not possible if auto_pm is set...
- dev_warn(&intf->dev, "no suspend for driver %s?\n",
- driver->name);
+ /* Later we will unbind the driver and reprobe */
+ intf->needs_binding = 1;
+ dev_warn(&intf->dev, "no %s for driver %s?\n",
+ "suspend", driver->name);
mark_quiesced(intf);
}
done:
- dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status);
+ dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
return status;
}
/* Caller has locked intf's usb_device's pm_mutex */
-static int usb_resume_interface(struct usb_interface *intf, int reset_resume)
+static int usb_resume_interface(struct usb_device *udev,
+ struct usb_interface *intf, pm_message_t msg, int reset_resume)
{
struct usb_driver *driver;
int status = 0;
- if (interface_to_usbdev(intf)->state == USB_STATE_NOTATTACHED ||
- is_active(intf))
+ if (udev->state == USB_STATE_NOTATTACHED || is_active(intf))
goto done;
/* Don't let autoresume interfere with unbinding */
/* Can't resume it if it doesn't have a driver. */
if (intf->condition == USB_INTERFACE_UNBOUND) {
- status = -ENOTCONN;
+
+ /* Carry out a deferred switch to altsetting 0 */
+ if (intf->needs_altsetting0 &&
+ intf->dev.power.status == DPM_ON) {
+ usb_set_interface(udev, intf->altsetting[0].
+ desc.bInterfaceNumber, 0);
+ intf->needs_altsetting0 = 0;
+ }
goto done;
}
+
+ /* Don't resume if the interface is marked for rebinding */
+ if (intf->needs_binding)
+ goto done;
driver = to_usb_driver(intf->dev.driver);
- if (reset_resume && driver->post_reset)
- driver->post_reset(intf, reset_resume);
- else if (driver->resume) {
- status = driver->resume(intf);
- if (status)
- dev_err(&intf->dev, "%s error %d\n",
- "resume", status);
- } else
- dev_warn(&intf->dev, "no resume for driver %s?\n",
- driver->name);
+ if (reset_resume) {
+ if (driver->reset_resume) {
+ status = driver->reset_resume(intf);
+ if (status)
+ dev_err(&intf->dev, "%s error %d\n",
+ "reset_resume", status);
+ } else {
+ intf->needs_binding = 1;
+ dev_warn(&intf->dev, "no %s for driver %s?\n",
+ "reset_resume", driver->name);
+ }
+ } else {
+ if (driver->resume) {
+ status = driver->resume(intf);
+ if (status)
+ dev_err(&intf->dev, "%s error %d\n",
+ "resume", status);
+ } else {
+ intf->needs_binding = 1;
+ dev_warn(&intf->dev, "no %s for driver %s?\n",
+ "resume", driver->name);
+ }
+ }
done:
- dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status);
- if (status == 0)
+ dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
+ if (status == 0 && intf->condition == USB_INTERFACE_BOUND)
mark_active(intf);
+
+ /* Later we will unbind the driver and/or reprobe, if necessary */
return status;
}
#ifdef CONFIG_USB_SUSPEND
/* Internal routine to check whether we may autosuspend a device. */
-static int autosuspend_check(struct usb_device *udev)
+static int autosuspend_check(struct usb_device *udev, int reschedule)
{
int i;
struct usb_interface *intf;
- unsigned long suspend_time;
+ unsigned long suspend_time, j;
/* For autosuspend, fail fast if anything is in use or autosuspend
* is disabled. Also fail if any interfaces require remote wakeup
* but it isn't available.
*/
- udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
if (udev->pm_usage_cnt > 0)
return -EBUSY;
if (udev->autosuspend_delay < 0 || udev->autosuspend_disabled)
"for autosuspend\n");
return -EOPNOTSUPP;
}
+
+ /* Don't allow autosuspend if the device will need
+ * a reset-resume and any of its interface drivers
+ * doesn't include support.
+ */
+ if (udev->quirks & USB_QUIRK_RESET_RESUME) {
+ struct usb_driver *driver;
+
+ driver = to_usb_driver(intf->dev.driver);
+ if (!driver->reset_resume ||
+ intf->needs_remote_wakeup)
+ return -EOPNOTSUPP;
+ }
}
}
/* If everything is okay but the device hasn't been idle for long
- * enough, queue a delayed autosuspend request.
+ * enough, queue a delayed autosuspend request. If the device
+ * _has_ been idle for long enough and the reschedule flag is set,
+ * likewise queue a delayed (1 second) autosuspend request.
*/
- if (time_after(suspend_time, jiffies)) {
+ j = jiffies;
+ if (time_before(j, suspend_time))
+ reschedule = 1;
+ else
+ suspend_time = j + HZ;
+ if (reschedule) {
if (!timer_pending(&udev->autosuspend.timer)) {
-
- /* The value of jiffies may change between the
- * time_after() comparison above and the subtraction
- * below. That's okay; the system behaves sanely
- * when a timer is registered for the present moment
- * or for the past.
- */
queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend,
- suspend_time - jiffies);
- }
+ round_jiffies_up_relative(suspend_time - j));
+ }
return -EAGAIN;
}
return 0;
#else
-static inline int autosuspend_check(struct usb_device *udev)
+static inline int autosuspend_check(struct usb_device *udev, int reschedule)
{
return 0;
}
* 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) {
- status = autosuspend_check(udev);
+ if (msg.event & PM_EVENT_AUTO) {
+ status = autosuspend_check(udev, 0);
if (status < 0)
goto done;
}
if (udev->actconfig) {
for (; i < udev->actconfig->desc.bNumInterfaces; i++) {
intf = udev->actconfig->interface[i];
- status = usb_suspend_interface(intf, msg);
+ status = usb_suspend_interface(udev, intf, msg);
if (status != 0)
break;
}
}
- if (status == 0) {
-
- /* Non-root devices don't need to do anything for FREEZE
- * or PRETHAW. */
- if (udev->parent && (msg.event == PM_EVENT_FREEZE ||
- msg.event == PM_EVENT_PRETHAW))
- goto done;
+ if (status == 0)
status = usb_suspend_device(udev, msg);
- }
/* 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(intf, 0);
+ usb_resume_interface(udev, intf, msg2, 0);
}
/* Try another autosuspend when the interfaces aren't busy */
- if (udev->auto_pm)
- autosuspend_check(udev);
+ if (msg.event & PM_EVENT_AUTO)
+ autosuspend_check(udev, status == -EBUSY);
- /* If the suspend succeeded, propagate it up the tree */
+ /* If the suspend succeeded then prevent any more URB submissions,
+ * flush any outstanding URBs, and propagate the suspend up the tree.
+ */
} else {
cancel_delayed_work(&udev->autosuspend);
- if (parent)
+ udev->can_submit = 0;
+ for (i = 0; i < 16; ++i) {
+ usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
+ usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
+ }
+
+ /* If this is just a FREEZE or a PRETHAW, udev might
+ * not really be suspended. Only true suspends get
+ * propagated up the device tree.
+ */
+ if (parent && udev->state == USB_STATE_SUSPENDED)
usb_autosuspend_device(parent);
}
done:
- dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
+ dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
return status;
}
/**
* 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;
status = -ENODEV;
goto done;
}
+ udev->can_submit = 1;
/* 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);
- if (status) {
+ status = usb_resume_device(udev, msg);
+ if (status || udev->state ==
+ USB_STATE_NOTATTACHED) {
usb_autosuspend_device(parent);
/* It's possible usb_resume_device()
/* We can't progagate beyond the USB subsystem,
* so if a root hub's controller is suspended
* then we're stuck. */
- if (udev->dev.parent->power.power_state.event !=
- PM_EVENT_ON)
- status = -EHOSTUNREACH;
- else
- status = usb_resume_device(udev);
- }
- } else {
-
- /* Needed for setting udev->dev.power.power_state.event,
- * for possible debugging message, and for reset_resume. */
- status = usb_resume_device(udev);
- }
+ status = usb_resume_device(udev, msg);
+ }
+ } else if (udev->reset_resume)
+ 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(intf, udev->reset_resume);
+ usb_resume_interface(udev, intf, msg,
+ udev->reset_resume);
}
}
done:
- dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status);
- udev->reset_resume = 0;
+ dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
+ if (!status)
+ udev->reset_resume = 0;
return status;
}
udev->auto_pm = 1;
udev->pm_usage_cnt += inc_usage_cnt;
WARN_ON(udev->pm_usage_cnt < 0);
+ if (inc_usage_cnt)
+ 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) {
- if (inc_usage_cnt)
- udev->last_busy = jiffies;
- 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
status = usb_autopm_do_device(udev, -1);
dev_vdbg(&udev->dev, "%s: cnt %d\n",
- __FUNCTION__, udev->pm_usage_cnt);
+ __func__, udev->pm_usage_cnt);
}
/**
{
usb_autopm_do_device(udev, 0);
dev_vdbg(&udev->dev, "%s: cnt %d\n",
- __FUNCTION__, udev->pm_usage_cnt);
+ __func__, udev->pm_usage_cnt);
}
/**
status = usb_autopm_do_device(udev, 1);
dev_vdbg(&udev->dev, "%s: status %d cnt %d\n",
- __FUNCTION__, status, udev->pm_usage_cnt);
+ __func__, status, udev->pm_usage_cnt);
return status;
}
else {
udev->auto_pm = 1;
intf->pm_usage_cnt += inc_usage_cnt;
+ 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 if (inc_usage_cnt)
+ else
udev->last_busy = jiffies;
} else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) {
- if (inc_usage_cnt)
- udev->last_busy = jiffies;
- status = usb_suspend_both(udev, PMSG_SUSPEND);
+ status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
}
}
usb_pm_unlock(udev);
status = usb_autopm_do_interface(intf, -1);
dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __FUNCTION__, status, intf->pm_usage_cnt);
+ __func__, status, intf->pm_usage_cnt);
}
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
*
status = usb_autopm_do_interface(intf, 1);
dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __FUNCTION__, status, intf->pm_usage_cnt);
+ __func__, status, intf->pm_usage_cnt);
return status;
}
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
*
status = usb_autopm_do_interface(intf, 0);
dev_vdbg(&intf->dev, "%s: status %d cnt %d\n",
- __FUNCTION__, status, intf->pm_usage_cnt);
+ __func__, status, intf->pm_usage_cnt);
return status;
}
EXPORT_SYMBOL_GPL(usb_autopm_set_interface);
void usb_autosuspend_work(struct work_struct *work)
{}
+void usb_autoresume_work(struct work_struct *work)
+{}
+
#endif /* CONFIG_USB_SUSPEND */
/**
{
int status;
+ do_unbind_rebind(udev, DO_UNBIND);
usb_pm_lock(udev);
udev->auto_pm = 0;
status = usb_suspend_both(udev, msg);
/**
* 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)
+ do_unbind_rebind(udev, DO_REBIND);
/* Now that the device is awake, we can start trying to autosuspend
* it again. */
return status;
}
-static int usb_suspend(struct device *dev, pm_message_t message)
+int usb_suspend(struct device *dev, pm_message_t msg)
{
- if (!is_usb_device(dev)) /* Ignore PM for interfaces */
+ struct usb_device *udev;
+
+ udev = to_usb_device(dev);
+
+ /* If udev is already suspended, we can skip this suspend and
+ * we should also skip the upcoming system resume. High-speed
+ * root hubs are an exception; they need to resume whenever the
+ * system wakes up in order for USB-PERSIST port handover to work
+ * properly.
+ */
+ if (udev->state == USB_STATE_SUSPENDED) {
+ if (udev->parent || udev->speed != USB_SPEED_HIGH)
+ udev->skip_sys_resume = 1;
return 0;
- return usb_external_suspend_device(to_usb_device(dev), message);
+ }
+
+ udev->skip_sys_resume = 0;
+ return usb_external_suspend_device(udev, msg);
}
-static int usb_resume(struct device *dev)
+int usb_resume(struct device *dev, pm_message_t msg)
{
struct usb_device *udev;
+ int status;
- if (!is_usb_device(dev)) /* Ignore PM for interfaces */
- return 0;
udev = to_usb_device(dev);
- /* If autoresume is disabled then we also want to prevent resume
- * during system wakeup. However, a "persistent-device" reset-resume
- * after power loss counts as a wakeup event. So allow a
- * reset-resume to occur if remote wakeup is enabled. */
- if (udev->autoresume_disabled) {
- if (!(udev->reset_resume && udev->do_remote_wakeup))
- return -EPERM;
- }
- return usb_external_resume_device(udev);
-}
-
-#else
+ /* If udev->skip_sys_resume is set then udev was already suspended
+ * when the system sleep started, so we don't want to resume it
+ * during this system wakeup.
+ */
+ if (udev->skip_sys_resume)
+ return 0;
+ status = usb_external_resume_device(udev, msg);
-#define usb_suspend NULL
-#define usb_resume NULL
+ /* Avoid PM error messages for devices disconnected while suspended
+ * as we'll display regular disconnect messages just a bit later.
+ */
+ if (status == -ENODEV)
+ return 0;
+ return status;
+}
#endif /* CONFIG_PM */
.name = "usb",
.match = usb_device_match,
.uevent = usb_uevent,
- .suspend = usb_suspend,
- .resume = usb_resume,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff