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Input: goodix - add support for capacitive home button 

On some x86 tablets with a Goodix touchscreen, the Windows logo on the
front is a capacitive home button. Touching this button results in a touch
with bit 4 of the first byte set, while only the lower 4 bits (0-3) are
used to indicate the number of touches.

Report a KEY_LEFTMETA press when this happens.

Note that the hardware might support more than one button, in which
case the "id" byte of coor_data would identify the button in question.
This is not implemented as we don't have access to hardware with
multiple buttons.

Signed-off-by: Sergei A. Trusov <sergei.a.trusov@ya.ru>
Acked-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Sergei A. Trusov 2017-09-06 17:29:24 -07:00 committed by Dmitry Torokhov
parent 3e5b08518f
commit 4a54feea17
1 changed files with 9 additions and 0 deletions
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9
drivers/input/touchscreen/goodix.c
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@ -267,6 +267,12 @@ static void goodix_process_events(struct goodix_ts_data *ts)
if (touch_num < 0)
return;
/*
* Bit 4 of the first byte reports the status of the capacitive
* Windows/Home button.
*/
input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] & BIT(4));
for (i = 0; i < touch_num; i++)
goodix_ts_report_touch(ts,
&point_data[1 + GOODIX_CONTACT_SIZE * i]);
@ -612,6 +618,9 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts)
ts->input_dev->id.product = ts->id;
ts->input_dev->id.version = ts->version;
/* Capacitive Windows/Home button on some devices */
input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
error = input_register_device(ts->input_dev);
if (error) {
dev_err(&ts->client->dev,