diff options
| author |   Blaž Hrastnik <blaz@mxxn.io> | 2020-12-19 13:47:41 +0900 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2021-01-26 11:09:06 +0100 |
| commit | c7aa374e0000daa89201fc29912b60081b269339 (patch) | |
| tree | 8608937eb05d58fb5954456332f587e869a8413c /drivers/hid/hid-multitouch.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid (diff) | |
| download | linux-dev-c7aa374e0000daa89201fc29912b60081b269339.tar.xz linux-dev-c7aa374e0000daa89201fc29912b60081b269339.zip | |
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: Blaž Hrastnik <blaz@mxxn.io>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-multitouch.c')
| -rw-r--r-- | drivers/hid/hid-multitouch.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 0743ef51d3b2..39e802eeff24 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -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 |