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From 2a99775c336303d2efc43eab4f24b34722a28faa Mon Sep 17 00:00:00 2001
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From: "Sergei A. Trusov" <sergei.a.trusov@ya.ru>
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Date: Tue, 20 Jun 2017 18:08:35 +0200
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Subject: [PATCH 11/16] Input: goodix: Add support for capacitive home button
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On some x86 tablets with a Goodix touchscreen, the Windows logo on the
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front is a capacitive home button. Touching this button results in a touch
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with bit 4 of the first byte set, while only the lower 4 bits (0-3) are
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used to indicate the number of touches.
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Report a KEY_LEFTMETA press when this happens.
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Note that the hardware might support more than one button, in which
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case the "id" byte of coor_data would identify the button in question.
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This is not implemented as we don't have access to hardware with
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multiple buttons.
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Signed-off-by: Sergei A. Trusov <sergei.a.trusov@ya.ru>
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Acked-by: Bastien Nocera <hadess@hadess.net>
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---
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drivers/input/touchscreen/goodix.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
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index 240b16f3ee97..903137d9cf7d 100644
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--- a/drivers/input/touchscreen/goodix.c
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+++ b/drivers/input/touchscreen/goodix.c
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@@ -267,6 +267,12 @@ static void goodix_process_events(struct goodix_ts_data *ts)
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if (touch_num < 0)
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return;
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+ /*
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+ * Bit 4 of the first byte reports the status of the capacitive
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+ * Windows/Home button.
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+ */
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+ input_report_key(ts->input_dev, KEY_LEFTMETA, !!(point_data[0] & BIT(4)));
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+
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for (i = 0; i < touch_num; i++)
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goodix_ts_report_touch(ts,
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&point_data[1 + GOODIX_CONTACT_SIZE * i]);
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@@ -612,6 +618,9 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts)
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ts->input_dev->id.product = ts->id;
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ts->input_dev->id.version = ts->version;
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+ /* Capacitive Windows/Home button on some devices */
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+ input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
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+
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error = input_register_device(ts->input_dev);
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if (error) {
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dev_err(&ts->client->dev,
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--
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2.13.0
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