Resneptacle/openwrt-cghmn-mt300n
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mediatek: add support for reset gpio

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Some versions of the ledbar MCU have a reset pin. It needs to be
correctly initialized or we might keep the MCU in reset state.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
(cherry picked from commit 84e4bbf5f049cdb862eb25c446bd6973ed4238aa)
This commit is contained in:
Sven Wegener 2021-06-12 21:56:22 +02:00 committed by Daniel Golle
parent b5665a0045
commit 26cd0c1ee9
1 changed files with 26 additions and 0 deletions
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26
target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
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@ -39,6 +39,7 @@ struct ubnt_ledbar {
struct led_classdev led_green; struct led_classdev led_green;
struct led_classdev led_blue; struct led_classdev led_blue;
struct gpio_desc *enable_gpio; struct gpio_desc *enable_gpio;
struct gpio_desc *reset_gpio;
}; };
static void ubnt_ledbar_perform_transaction(struct ubnt_ledbar *ledbar, static void ubnt_ledbar_perform_transaction(struct ubnt_ledbar *ledbar,
@ -96,6 +97,20 @@ out_gpio:
return ret; return ret;
} }
static void ubnt_ledbar_reset(struct ubnt_ledbar *ledbar)
{
if (!ledbar->reset_gpio)
return;
mutex_lock(&ledbar->lock);
gpiod_set_value(ledbar->reset_gpio, 1);
msleep(10);
gpiod_set_value(ledbar->reset_gpio, 0);
mutex_unlock(&ledbar->lock);
}
#define UBNT_LEDBAR_CONTROL_RGBS(name) \ #define UBNT_LEDBAR_CONTROL_RGBS(name) \
static int ubnt_ledbar_set_##name##_brightness(struct led_classdev *led_cdev,\ static int ubnt_ledbar_set_##name##_brightness(struct led_classdev *led_cdev,\
enum led_brightness value) \ enum led_brightness value) \
@ -154,12 +169,23 @@ static int ubnt_ledbar_probe(struct i2c_client *client,
return ret; return ret;
} }
ledbar->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ledbar->reset_gpio)) {
ret = PTR_ERR(ledbar->reset_gpio);
dev_err(&client->dev, "Failed to get reset gpio: %d\n", ret);
return ret;
}
ledbar->client = client; ledbar->client = client;
mutex_init(&ledbar->lock); mutex_init(&ledbar->lock);
i2c_set_clientdata(client, ledbar); i2c_set_clientdata(client, ledbar);
// Reset and initialize the MCU
ubnt_ledbar_reset(ledbar);
ledbar->led_red.brightness_set_blocking = ubnt_ledbar_set_red_brightness; ledbar->led_red.brightness_set_blocking = ubnt_ledbar_set_red_brightness;
ubnt_ledbar_init_led(of_get_child_by_name(np, "red"), ledbar, &ledbar->led_red); ubnt_ledbar_init_led(of_get_child_by_name(np, "red"), ledbar, &ledbar->led_red);