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 normally only the lower 4 bits
are used to indicate the number of touches.
Detect this and report a KEY_LEFTMETA press when this happens. Note the
hardware might support more than one button, the number of a button is
reported by the 'id' byte of coor_data. Now we ignore button id.
Signed-off-by: Sergei A. Trusov <sergei.a.trusov@xxxxx>
---
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..c1bb59c96dbd 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] & 0x10));
+
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,
--
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