[PATCH] HID: multitouch: Release all touch slots on reset_resume
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2016-03-11 22:19:56
Also in:
lkml
Subsystem:
hid core layer, the rest · Maintainers:
Jiri Kosina, Benjamin Tissoires, Linus Torvalds
From: Benson Leung <bleung@chromium.org> When resetting a device (especially after power loss) it is unlikely that the firmware will keep the contact tracking data for the previous touches and will be able to reconcile it with the new contacts, so let's release all slots on reset resume as start anew. Signed-off-by: Benson Leung <bleung@chromium.org> Signed-off-by: Dmitry Torokhov <redacted> --- drivers/hid/hid-multitouch.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 6adb788..e24e33c 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c@@ -1148,8 +1148,30 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id) } #ifdef CONFIG_PM +static void mt_release_contacts(struct hid_device *hid) +{ + struct hid_input *hidinput; + + list_for_each_entry(hidinput, &hid->inputs, list) { + struct input_dev *input_dev = hidinput->input; + struct input_mt *mt = input_dev->mt; + int i; + + if (mt) { + for (i = 0; i < mt->num_slots; i++) { + input_mt_slot(input_dev, i); + input_mt_report_slot_state(input_dev, + MT_TOOL_FINGER, + false); + } + input_sync(input_dev); + } + } +} + static int mt_reset_resume(struct hid_device *hdev) { + mt_release_contacts(hdev); mt_set_maxcontacts(hdev); mt_set_input_mode(hdev); return 0;
--
2.7.0.rc3.207.g0ac5344
--
Dmitry