Commit c7aa374e authored by Blaž Hrastnik's avatar Blaž Hrastnik Committed by Jiri Kosina
Browse files

HID: multitouch: Set to high latency mode on suspend. 



Per Windows Precision Touchpad guidelines:

> The latency mode feature report is sent by the host to a Windows
> Precision Touchpad to indicate when high latency is desirable for
> power savings and, conversely, when normal latency is desired for
> operation.
>
> For USB-connected Windows Precision Touchpads, this enables the device
> to disambiguate between being suspended for inactivity (runtime IDLE)
> and being suspended because the system is entering S3 or Connected
> Standby.

The current implementation would set the latency to normal on device initialization,
but we didn't set the device to high latency on suspend.

Signed-off-by: default avatarBlaž Hrastnik <blaz@mxxn.io>
Acked-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 2bbe17ae

drivers/hid/hid-multitouch.c

+10 −0
Original line number Diff line number Diff line
@@ -1746,6 +1746,13 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id) 
}



#ifdef CONFIG_PM

static int mt_suspend(struct hid_device *hdev, pm_message_t state)

{

	/* High latency is desirable for power savings during S3/S0ix */

	mt_set_modes(hdev, HID_LATENCY_HIGH, true, true);

	return 0;

}



static int mt_reset_resume(struct hid_device *hdev)

{

	mt_release_contacts(hdev);
@@ -1761,6 +1768,8 @@ static int mt_resume(struct hid_device *hdev) 


	hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);



	mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);



	return 0;

}

#endif
@@ -2154,6 +2163,7 @@ static struct hid_driver mt_driver = { 
	.event = mt_event,

	.report = mt_report,

#ifdef CONFIG_PM

	.suspend = mt_suspend,

	.reset_resume = mt_reset_resume,

	.resume = mt_resume,

#endif