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authorAlan Stern <stern@rowland.harvard.edu>2006-08-30 15:47:02 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-27 11:58:57 -0700
commit645daaab0b6adc35c1838df2a82f9d729fdb1767 (patch)
tree908d58f6c0ad01e9c1622a4c12c9c8080c629baa /drivers/usb/core/usb.h
parentb6956ffa595db97656d5901ca8fec77ef272d41a (diff)
usbcore: add autosuspend/autoresume infrastructure
This patch (as739) adds the basic infrastructure for USB autosuspend and autoresume. The main features are: PM usage counters added to struct usb_device and struct usb_interface, indicating whether it's okay to autosuspend them or they are currently in use. Flag added to usb_device indicating whether the current suspend/resume operation originated from outside or as an autosuspend/autoresume. Flag added to usb_driver indicating whether the driver supports autosuspend. If not, no device bound to the driver will be autosuspended. Mutex added to usb_device for protecting PM operations. Unlike the device semaphore, the locking rule for the pm_mutex is that you must acquire the locks going _up_ the device tree. New routines handling autosuspend/autoresume requests for interfaces and devices. Suspend and resume requests are propagated up the device tree (but not outside the USB subsystem). work_struct added to usb_device, for carrying out delayed autosuspend requests. Autoresume added (and autosuspend prevented) during probe and disconnect. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/usb.h')
-rw-r--r--drivers/usb/core/usb.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index 5162cb370215..10688ad73c6d 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -49,6 +49,20 @@ static inline int usb_resume_both(struct usb_device *udev)
#endif
+#ifdef CONFIG_USB_SUSPEND
+
+#define USB_AUTOSUSPEND_DELAY (HZ*2)
+
+extern void usb_autosuspend_device(struct usb_device *udev, int dec_busy_cnt);
+extern int usb_autoresume_device(struct usb_device *udev, int inc_busy_cnt);
+
+#else
+
+#define usb_autosuspend_device(udev, dec_busy_cnt) do {} while (0)
+#define usb_autoresume_device(udev, inc_busy_cnt) 0
+
+#endif
+
extern struct bus_type usb_bus_type;
extern struct usb_device_driver usb_generic_driver;