From 84e4bbf5f049cdb862eb25c446bd6973ed4238aa Mon Sep 17 00:00:00 2001 From: Sven Wegener Date: Sat, 12 Jun 2021 21:56:22 +0200 Subject: [PATCH] mediatek: add support for reset gpio 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 --- .../files/drivers/leds/leds-ubnt-ledbar.c | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/target/linux/mediatek/files/drivers/leds/leds-ubnt-ledbar.c b/target/linux/mediatek/files/drivers/leds/leds-ubnt-ledbar.c index c62e233e6d..1d687b7686 100644 --- a/target/linux/mediatek/files/drivers/leds/leds-ubnt-ledbar.c +++ b/target/linux/mediatek/files/drivers/leds/leds-ubnt-ledbar.c @@ -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); -- 2.30.2