Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2025-01-01 10:42:11 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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: Blaž Hrastnik <blaz@mxxn.io>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Blaž Hrastnik 2020-12-19 13:47:41 +09:00 committed by Jiri Kosina
parent 2bbe17ae87
commit c7aa374e00
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/hid/hid-multitouch.c
View File

@ -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