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Input: cap11xx - add reset gpio support

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Some CAP11xx devices (CAP1126/CAP1188) have a dedicated RESET pin.
Add hardware reset operation to improve device reliability and
ensure proper initialization on probe.

Signed-off-by: Jun Yan <jerrysteve1101@gmail.com>
Link: https://patch.msgid.link/20260617150318.753148-7-jerrysteve1101@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Jun Yan 2026-06-17 23:02:45 +08:00 committed by Dmitry Torokhov
parent 7c492b9eee
commit e40bdf042d
1 changed files with 16 additions and 0 deletions
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16
drivers/input/keyboard/cap11xx.c
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@ -5,6 +5,7 @@
* (c) 2014 Daniel Mack <linux@zonque.org>
*/
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
@ -44,6 +45,9 @@
#define CAP11XX_MANUFACTURER_ID 0x5d
#define CAP11XX_T_RST_FILT_MIN_US 10000
#define CAP11XX_T_RST_ON_MIN_MS 400
#ifdef CONFIG_LEDS_CLASS
struct cap11xx_led {
struct cap11xx_priv *priv;
@ -56,6 +60,7 @@ struct cap11xx_priv {
struct regmap *regmap;
struct device *dev;
struct input_dev *idev;
struct gpio_desc *reset_gpio;
const struct cap11xx_hw_model *model;
struct cap11xx_led *leds;
@ -459,6 +464,17 @@ static int cap11xx_i2c_probe(struct i2c_client *i2c_client)
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(priv->reset_gpio))
return dev_err_probe(dev, PTR_ERR(priv->reset_gpio),
"Failed to get 'reset' GPIO\n");
if (priv->reset_gpio) {
usleep_range(CAP11XX_T_RST_FILT_MIN_US, CAP11XX_T_RST_FILT_MIN_US * 2);
gpiod_set_value_cansleep(priv->reset_gpio, 0);
msleep(CAP11XX_T_RST_ON_MIN_MS);
}
error = regmap_read(priv->regmap, CAP11XX_REG_PRODUCT_ID, &val);
if (error)
return dev_err_probe(dev, error, "Failed to read product ID\n");