linux-kernel - [PATCH v7 4/4] Input: st1232 - add touch overlays handling

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Message-Id: <20240119-feature-ts_virtobj_patch-v7-4-eda70985808f@wolfvision.net>
Date: Fri, 19 Jan 2024 08:43:36 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Henrik Rydberg <rydberg@...math.org>, 
 Bastian Hecht <hechtb@...il.com>, 
 Michael Riesch <michael.riesch@...fvision.net>, 
 Jeff LaBundy <jeff@...undy.com>
Cc: linux-kernel@...r.kernel.org, linux-input@...r.kernel.org, 
 devicetree@...r.kernel.org, 
 Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH v7 4/4] Input: st1232 - add touch overlays handling

Use touch-overlay to support overlay objects such as buttons and a resized
frame defined in the device tree.

If buttons are provided, register an additional device to report key
events separately. A key event will be generated if the coordinates
of a touch event are within the area defined by the button properties.

Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
 drivers/input/touchscreen/st1232.c | 48 +++++++++++++++++++++++++++-----------
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
index 6475084aee1b..4fa31447dbc1 100644
--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c
@@ -22,6 +22,7 @@
 #include <linux/pm_qos.h>
 #include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/input/touch-overlay.h>
 
 #define ST1232_TS_NAME	"st1232-ts"
 #define ST1633_TS_NAME	"st1633-ts"
@@ -57,6 +58,7 @@ struct st1232_ts_data {
 	struct dev_pm_qos_request low_latency_req;
 	struct gpio_desc *reset_gpio;
 	const struct st_chip_info *chip_info;
+	struct list_head touch_overlay_list;
 	int read_buf_len;
 	u8 *read_buf;
 };
@@ -138,14 +140,20 @@ static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
 
 	for (i = 0; i < ts->chip_info->max_fingers; i++) {
 		u8 *buf = &ts->read_buf[i * 4];
+		bool contact = buf[0] & BIT(7);
+		unsigned int x, y;
 
-		if (buf[0] & BIT(7)) {
-			unsigned int x = ((buf[0] & 0x70) << 4) | buf[1];
-			unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];
-
-			touchscreen_set_mt_pos(&pos[n_contacts],
-					       &ts->prop, x, y);
+		if (contact) {
+			x = ((buf[0] & 0x70) << 4) | buf[1];
+			y = ((buf[0] & 0x07) << 8) | buf[2];
+		}
+		if (touch_overlay_process_event(&ts->touch_overlay_list, input,
+						contact ? &x : NULL,
+						contact ? &y : NULL, i))
+			continue;
 
+		if (contact) {
+			touchscreen_set_mt_pos(&pos[n_contacts], &ts->prop, x, y);
 			/* st1232 includes a z-axis / touch strength */
 			if (ts->chip_info->have_z)
 				z[n_contacts] = ts->read_buf[i + 6];
@@ -292,18 +300,30 @@ static int st1232_ts_probe(struct i2c_client *client)
 	if (error)
 		return error;
 
-	/* Read resolution from the chip */
-	error = st1232_ts_read_resolution(ts, &max_x, &max_y);
-	if (error) {
-		dev_err(&client->dev,
-			"Failed to read resolution: %d\n", error);
-		return error;
-	}
-
 	if (ts->chip_info->have_z)
 		input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
 				     ts->chip_info->max_area, 0, 0);
 
+	/* map overlay objects if defined in the device tree */
+	INIT_LIST_HEAD(&ts->touch_overlay_list);
+	error = touch_overlay_map(&ts->touch_overlay_list, input_dev);
+	if (error)
+		return error;
+
+	if (touch_overlay_mapped_touchscreen(&ts->touch_overlay_list)) {
+		/* Read resolution from the overlay touchscreen if defined */
+		touch_overlay_get_touchscreen_abs(&ts->touch_overlay_list,
+						  &max_x, &max_y);
+	} else {
+		/* Read resolution from the chip */
+		error = st1232_ts_read_resolution(ts, &max_x, &max_y);
+		if (error) {
+			dev_err(&client->dev,
+				"Failed to read resolution: %d\n", error);
+			return error;
+		}
+	}
+
 	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
 			     0, max_x, 0, 0);
 	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,

-- 
2.39.2