diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/usb/core/driver.c | 206 |
1 files changed, 103 insertions, 103 deletions
diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 057eeab0600..638d54693a1 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1413,6 +1413,109 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg) return status; } +/** + * usb_external_suspend_device - external suspend of a USB device and its interfaces + * @udev: the usb_device to suspend + * @msg: Power Management message describing this state transition + * + * This routine handles external suspend requests: ones not generated + * internally by a USB driver (autosuspend) but rather coming from the user + * (via sysfs) or the PM core (system sleep). The suspend will be carried + * out regardless of @udev's usage counter or those of its interfaces, + * and regardless of whether or not remote wakeup is enabled. Of course, + * interface drivers still have the option of failing the suspend (if + * there are unsuspended children, for example). + * + * The caller must hold @udev's device lock. + */ +int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg) +{ + int status; + + do_unbind_rebind(udev, DO_UNBIND); + usb_pm_lock(udev); + status = usb_suspend_both(udev, msg); + usb_pm_unlock(udev); + return status; +} + +/** + * 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 + * (via sysfs), the PM core (system resume), or the device itself (remote + * wakeup). @udev's usage counter is unaffected. + * + * The caller must hold @udev's device lock. + */ +int usb_external_resume_device(struct usb_device *udev, pm_message_t msg) +{ + int status; + + usb_pm_lock(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. */ + if (status == 0) + usb_try_autosuspend_device(udev); + return status; +} + +int usb_suspend(struct device *dev, pm_message_t msg) +{ + 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; + } + + udev->skip_sys_resume = 0; + return usb_external_suspend_device(udev, msg); +} + +int usb_resume(struct device *dev, pm_message_t msg) +{ + struct usb_device *udev; + int status; + + udev = to_usb_device(dev); + + /* 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); + + /* 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 */ + #ifdef CONFIG_USB_SUSPEND /** @@ -1784,109 +1887,6 @@ void usb_autoresume_work(struct work_struct *work) #endif /* CONFIG_USB_SUSPEND */ -/** - * usb_external_suspend_device - external suspend of a USB device and its interfaces - * @udev: the usb_device to suspend - * @msg: Power Management message describing this state transition - * - * This routine handles external suspend requests: ones not generated - * internally by a USB driver (autosuspend) but rather coming from the user - * (via sysfs) or the PM core (system sleep). The suspend will be carried - * out regardless of @udev's usage counter or those of its interfaces, - * and regardless of whether or not remote wakeup is enabled. Of course, - * interface drivers still have the option of failing the suspend (if - * there are unsuspended children, for example). - * - * The caller must hold @udev's device lock. - */ -int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg) -{ - int status; - - do_unbind_rebind(udev, DO_UNBIND); - usb_pm_lock(udev); - status = usb_suspend_both(udev, msg); - usb_pm_unlock(udev); - return status; -} - -/** - * 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 - * (via sysfs), the PM core (system resume), or the device itself (remote - * wakeup). @udev's usage counter is unaffected. - * - * The caller must hold @udev's device lock. - */ -int usb_external_resume_device(struct usb_device *udev, pm_message_t msg) -{ - int status; - - usb_pm_lock(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. */ - if (status == 0) - usb_try_autosuspend_device(udev); - return status; -} - -int usb_suspend(struct device *dev, pm_message_t msg) -{ - 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; - } - - udev->skip_sys_resume = 0; - return usb_external_suspend_device(udev, msg); -} - -int usb_resume(struct device *dev, pm_message_t msg) -{ - struct usb_device *udev; - int status; - - udev = to_usb_device(dev); - - /* 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); - - /* 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 */ - struct bus_type usb_bus_type = { .name = "usb", .match = usb_device_match, |