Commit dddb4e38 authored by Grant Feng's avatar Grant Feng Committed by Pavel Machek
Browse files

leds: is31fl319x: Add shutdown pin and generate a 5ms low pulse when startup 



generate a 5ms low pulse on shutdown pin when startup, then the chip
becomes more stable in the complex EM environment.

Signed-off-by: default avatarGrant Feng <von81@163.com>
Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
parent 3d93edc7

drivers/leds/leds-is31fl319x.c

+18 −0
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
#include <linux/of_device.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>



/* register numbers */

#define IS31FL319X_SHUTDOWN		0x00
@@ -61,6 +63,7 @@ 
struct is31fl319x_chip {

	const struct is31fl319x_chipdef *cdef;

	struct i2c_client               *client;

	struct gpio_desc		*shutdown_gpio;

	struct regmap                   *regmap;

	struct mutex                    lock;

	u32                             audio_gain_db;
@@ -207,6 +210,15 @@ static int is31fl319x_parse_dt(struct device *dev, 
	if (!np)

		return -ENODEV;



	is31->shutdown_gpio = devm_gpiod_get_optional(dev,

						"shutdown",

						GPIOD_OUT_HIGH);

	if (IS_ERR(is31->shutdown_gpio)) {

		ret = PTR_ERR(is31->shutdown_gpio);

		dev_err(dev, "Failed to get shutdown gpio: %d\n", ret);

		return ret;

	}



	of_dev_id = of_match_device(of_is31fl319x_match, dev);

	if (!of_dev_id) {

		dev_err(dev, "Failed to match device with supported chips\n");
@@ -350,6 +362,12 @@ static int is31fl319x_probe(struct i2c_client *client, 
	if (err)

		goto free_mutex;



	if (is31->shutdown_gpio) {

		gpiod_direction_output(is31->shutdown_gpio, 0);

		mdelay(5);

		gpiod_direction_output(is31->shutdown_gpio, 1);

	}



	is31->client = client;

	is31->regmap = devm_regmap_init_i2c(client, &regmap_config);

	if (IS_ERR(is31->regmap)) {