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From 33fc16fd8aa3684e19b1d1f0a712593e2e570ab1 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Sun, 11 Jun 2017 21:24:50 +0200
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Subject: [PATCH 10/16] Input: silead: Add support for capactive home button
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 found on some x86 tablets
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On some x86 tablets with a silead 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 bits 12-15 of the Y coordinates set, while normally only the lower 12
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are used.
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Detect this and report a KEY_LEFTMETA press when this happens. Note for
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now we only respond to the Y coordinate bits 12-15 containing 0x01, on some
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tablets *without* a capacative button I've noticed these bits containing
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0x04 when crossing the edges of the screen.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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 drivers/input/touchscreen/silead.c | 45 ++++++++++++++++++++++++++++----------
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 1 file changed, 34 insertions(+), 11 deletions(-)
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diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
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index 0dbcf105f7db..c0ba40c09699 100644
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--- a/drivers/input/touchscreen/silead.c
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+++ b/drivers/input/touchscreen/silead.c
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@@ -56,7 +56,7 @@
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 #define SILEAD_POINT_Y_MSB_OFF	0x01
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 #define SILEAD_POINT_X_OFF	0x02
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 #define SILEAD_POINT_X_MSB_OFF	0x03
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-#define SILEAD_TOUCH_ID_MASK	0xF0
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+#define SILEAD_EXTRA_DATA_MASK	0xF0
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 #define SILEAD_CMD_SLEEP_MIN	10000
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 #define SILEAD_CMD_SLEEP_MAX	20000
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@@ -109,6 +109,8 @@ static int silead_ts_request_input_dev(struct silead_ts_data *data)
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 			    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
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 			    INPUT_MT_TRACK);
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+	input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
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+
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 	data->input->name = SILEAD_TS_NAME;
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 	data->input->phys = "input/ts";
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 	data->input->id.bustype = BUS_I2C;
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@@ -139,7 +141,8 @@ static void silead_ts_read_data(struct i2c_client *client)
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 	struct input_dev *input = data->input;
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 	struct device *dev = &client->dev;
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 	u8 *bufp, buf[SILEAD_TS_DATA_LEN];
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-	int touch_nr, error, i;
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+	int touch_nr, softbutton, error, i;
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+	bool softbutton_pressed = false;
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 	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
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 					      SILEAD_TS_DATA_LEN, buf);
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@@ -148,21 +151,40 @@ static void silead_ts_read_data(struct i2c_client *client)
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 		return;
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 	}
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-	touch_nr = buf[0];
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-	if (touch_nr > data->max_fingers) {
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+	if (buf[0] > data->max_fingers) {
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 		dev_warn(dev, "More touches reported then supported %d > %d\n",
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-			 touch_nr, data->max_fingers);
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-		touch_nr = data->max_fingers;
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+			 buf[0], data->max_fingers);
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+		buf[0] = data->max_fingers;
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 	}
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+	touch_nr = 0;
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 	bufp = buf + SILEAD_POINT_DATA_LEN;
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-	for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) {
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-		/* Bits 4-7 are the touch id */
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-		data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] &
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-			       SILEAD_TOUCH_ID_MASK) >> 4;
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-		touchscreen_set_mt_pos(&data->pos[i], &data->prop,
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+	for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
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+		softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
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+			      SILEAD_EXTRA_DATA_MASK) >> 4;
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+
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+		if (softbutton) {
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+			/*
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+			 * For now only respond to softbutton == 0x01, some
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+			 * tablets *without* a capacative button send 0x04
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+			 * when crossing the edges of the screen.
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+			 */
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+			if (softbutton == 0x01)
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+				softbutton_pressed = true;
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+
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+			continue;
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+		}
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+
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+		/*
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+		 * Bits 4-7 are the touch id, note not all models have
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+		 * hardware touch ids so atm we don't use these.
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+		 */
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+		data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
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+				      SILEAD_EXTRA_DATA_MASK) >> 4;
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+		touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
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 			get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
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 			get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
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+		touch_nr++;
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 	}
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 	input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
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@@ -178,6 +200,7 @@ static void silead_ts_read_data(struct i2c_client *client)
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 	}
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 	input_mt_sync_frame(input);
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+	input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
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 	input_sync(input);
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 }
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-- 
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2.13.0
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