From: Petr Hodina <petr.hodina@protonmail.com>
Date: Sun, 26 Apr 2026 20:57:41 +0000 (-0700)
Subject: Input: stmfts - add optional reset GPIO support
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8a1f9de80e45951b43d6e1e287a07f7d94cadbe8;p=thirdparty%2Flinux.git

Input: stmfts - add optional reset GPIO support

Add support for an optional "reset-gpios" property. If present, the
driver drives the reset line high at probe time and releases it during
power-on, after the regulators have been enabled.

Signed-off-by: Petr Hodina <petr.hodina@protonmail.com>
Co-developed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20260409-stmfts5-v4-8-64fe62027db5@ixit.cz
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

diff --git a/drivers/input/touchscreen/stmfts.c b/drivers/input/touchscreen/stmfts.c
index 1955419a0db5..43158d03ecc1 100644
--- a/drivers/input/touchscreen/stmfts.c
+++ b/drivers/input/touchscreen/stmfts.c
@@ -5,6 +5,7 @@
 // Copyright (c) 2017 Andi Shyti <andi@etezian.org>
 
 #include <linux/delay.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/input/mt.h>
 #include <linux/input/touchscreen.h>
@@ -77,6 +78,7 @@ static const struct regulator_bulk_data stmfts_supplies[] = {
 struct stmfts_data {
 	struct i2c_client *client;
 	struct input_dev *input;
+	struct gpio_desc *reset_gpio;
 	struct led_classdev led_cdev;
 	struct mutex mutex;
 
@@ -539,6 +541,15 @@ static int stmfts_read_system_info(struct stmfts_data *sdata)
 	return 0;
 }
 
+static void stmfts_reset(struct stmfts_data *sdata)
+{
+	gpiod_set_value_cansleep(sdata->reset_gpio, 1);
+	msleep(20);
+
+	gpiod_set_value_cansleep(sdata->reset_gpio, 0);
+	msleep(50);
+}
+
 static int stmfts_configure(struct stmfts_data *sdata)
 {
 	int err;
@@ -585,6 +596,9 @@ static int stmfts_power_on(struct stmfts_data *sdata)
 	 */
 	msleep(20);
 
+	if (sdata->reset_gpio)
+		stmfts_reset(sdata);
+
 	err = stmfts_read_system_info(sdata);
 	if (err)
 		goto err_disable_regulators;
@@ -617,6 +631,10 @@ static void stmfts_power_off(void *data)
 	struct stmfts_data *sdata = data;
 
 	disable_irq(sdata->client->irq);
+
+	if (sdata->reset_gpio)
+		gpiod_set_value_cansleep(sdata->reset_gpio, 1);
+
 	regulator_bulk_disable(ARRAY_SIZE(stmfts_supplies), sdata->supplies);
 }
 
@@ -672,6 +690,11 @@ static int stmfts_probe(struct i2c_client *client)
 	if (err)
 		return err;
 
+	sdata->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(sdata->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(sdata->reset_gpio),
+				     "Failed to get GPIO 'reset'\n");
+
 	sdata->input = devm_input_allocate_device(dev);
 	if (!sdata->input)
 		return -ENOMEM;