From: "Sergei A. Trusov" <[email protected]> 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 <[email protected]> Acked-by: Bastien Nocera <[email protected]> --- Changes from v2: - commit message fixes - use BIT(4) instead of 0x10 drivers/input/touchscreen/goodix.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c index 240b16f3ee97..903137d9cf7d 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, -- 2.13.0
