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| author |   Sergei A. Trusov <sergei.a.trusov@ya.ru> | 2017-09-06 17:29:24 -0700 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-09-11 14:23:15 -0700 |
| commit | 4a54feea1765a79ac8446bd6f5ce163fc94a8a95 (patch) | |
| tree | aec1fa63ef7eef29d50236f5682233925b5bc331 /drivers/input | |
| parent | Input: add a driver for PWM controllable vibrators (diff) | |
| download | linux-dev-4a54feea1765a79ac8446bd6f5ce163fc94a8a95.tar.xz linux-dev-4a54feea1765a79ac8446bd6f5ce163fc94a8a95.zip | |
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>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/touchscreen/goodix.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index 240b16f3ee97..32d2762448aa 100644 --- a/drivers/input/touchscreen/goodix.c +++ b/drivers/input/touchscreen/goodix.c @@ -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, |