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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: Grant Feng <von81@163.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Grant Feng 2020-08-25 16:22:05 +08:00 committed by Pavel Machek
parent 3d93edc775
commit dddb4e38c6
1 changed files with 18 additions and 0 deletions
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18
drivers/leds/leds-is31fl319x.c
View File

@ -16,6 +16,8 @@
#include <linux/of_device.h> #include <linux/of_device.h>
#include <linux/regmap.h> #include <linux/regmap.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
/* register numbers */ /* register numbers */
#define IS31FL319X_SHUTDOWN 0x00 #define IS31FL319X_SHUTDOWN 0x00
@ -61,6 +63,7 @@
struct is31fl319x_chip { struct is31fl319x_chip {
const struct is31fl319x_chipdef *cdef; const struct is31fl319x_chipdef *cdef;
struct i2c_client *client; struct i2c_client *client;
struct gpio_desc *shutdown_gpio;
struct regmap *regmap; struct regmap *regmap;
struct mutex lock; struct mutex lock;
u32 audio_gain_db; u32 audio_gain_db;
@ -207,6 +210,15 @@ static int is31fl319x_parse_dt(struct device *dev,
if (!np) if (!np)
return -ENODEV; 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); of_dev_id = of_match_device(of_is31fl319x_match, dev);
if (!of_dev_id) { if (!of_dev_id) {
dev_err(dev, "Failed to match device with supported chips\n"); 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) if (err)
goto free_mutex; 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->client = client;
is31->regmap = devm_regmap_init_i2c(client, &regmap_config); is31->regmap = devm_regmap_init_i2c(client, &regmap_config);
if (IS_ERR(is31->regmap)) { if (IS_ERR(is31->regmap)) {