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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: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Hans de Goede 2021-05-29 17:14:21 +02:00 committed by Jiri Kosina
parent 231bc53906
commit 24e166f43e
1 changed files with 18 additions and 0 deletions
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18
include/linux/hid.h
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@ -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
*