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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>
This commit is contained in:
Sven Wegener 2021-06-12 21:56:22 +02:00 committed by Daniel Golle
parent 7c852e7df5
commit 84e4bbf5f0
1 changed files with 26 additions and 0 deletions
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26
target/linux/mediatek/files/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_blue;
struct gpio_desc *enable_gpio;
struct gpio_desc *reset_gpio;
};
static void ubnt_ledbar_perform_transaction(struct ubnt_ledbar *ledbar,
@ -96,6 +97,20 @@ out_gpio:
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) \
static int ubnt_ledbar_set_##name##_brightness(struct led_classdev *led_cdev,\
enum led_brightness value) \
@ -154,12 +169,23 @@ static int ubnt_ledbar_probe(struct i2c_client *client,
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;
mutex_init(&ledbar->lock);
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;
ubnt_ledbar_init_led(of_get_child_by_name(np, "red"), ledbar, &ledbar->led_red);