Commit 24e166f4 authored by Hans de Goede's avatar Hans de Goede Committed by Jiri Kosina
Browse files

HID: core: Add hid_hw_may_wakeup() function 



Add a hid_hw_may_wakeup() function, which is the equivalent of
device_may_wakeup() for hid devices.

In most cases this just returns device_may_wakeup(hdev->dev.parent), but for
some ll-drivers this is not correct. E.g. usb_hid_driver instantiated hid
devices have their parent set to the usb-interface to which the usb_hid_driver
is bound, but the power/wakeup* sysfs attributes are part of the usb-device,
which is the usb-interface's parent.

For these special cases a new may_wakeup callback is added to
hid_ll_driver, so that ll-drivers can override the default behavior.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Reviewed-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 231bc539

include/linux/hid.h

+18 −0
Original line number Diff line number Diff line
@@ -800,6 +800,7 @@ struct hid_driver { 
 * @raw_request: send raw report request to device (e.g. feature report)

 * @output_report: send output report to device

 * @idle: send idle request to device

 * @may_wakeup: return if device may act as a wakeup source during system-suspend

 */

struct hid_ll_driver {

	int (*start)(struct hid_device *hdev);
@@ -824,6 +825,7 @@ struct hid_ll_driver { 
	int (*output_report) (struct hid_device *hdev, __u8 *buf, size_t len);



	int (*idle)(struct hid_device *hdev, int report, int idle, int reqtype);

	bool (*may_wakeup)(struct hid_device *hdev);

};



extern struct hid_ll_driver i2c_hid_ll_driver;
@@ -1149,6 +1151,22 @@ static inline int hid_hw_idle(struct hid_device *hdev, int report, int idle, 
	return 0;

}



/**

 * hid_may_wakeup - return if the hid device may act as a wakeup source during system-suspend

 *

 * @hdev: hid device

 */

static inline bool hid_hw_may_wakeup(struct hid_device *hdev)

{

	if (hdev->ll_driver->may_wakeup)

		return hdev->ll_driver->may_wakeup(hdev);



	if (hdev->dev.parent)

		return device_may_wakeup(hdev->dev.parent);



	return false;

}



/**

 * hid_hw_wait - wait for buffered io to complete

 *