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Input: stmfts - add optional reset GPIO support

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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>
This commit is contained in:
Petr Hodina 2026-04-26 13:57:41 -07:00 committed by Dmitry Torokhov
parent dd78ec391f
commit 8a1f9de80e
1 changed files with 23 additions and 0 deletions
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23
drivers/input/touchscreen/stmfts.c
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@ -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;