Commit 4a54feea authored Sep 06, 2017 by Sergei A. Trusov Committed by Dmitry Torokhov Sep 11, 2017

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>

parent 3e5b0851

drivers/input/touchscreen/goodix.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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,