> +int led_set_brightness_sync(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + WARN_ON(led_cdev->blink_delay_on || led_cdev->blink_delay_off);
> +
> + led_cdev->brightness = min(value, led_cdev->max_brightness);
> +
> + if (led_cdev->flags & LED_SUSPENDED)
> + return 0;
> +
> + if (led_cdev->brightness_set_blocking)
> + return led_cdev->brightness_set_blocking(led_cdev,
> + led_cdev->brightness);
> + return -EINVAL;
Maybe -ENOTSUP would be better. It is not an invalid argument, the
driver does not support it.
> diff --git a/include/linux/leds.h b/include/linux/leds.h
> index ae3c178..2019929 100644
> --- a/include/linux/leds.h
> +++ b/include/linux/leds.h
> @@ -47,9 +47,7 @@ struct led_classdev {
> #define LED_BLINK_CHANGE (1 << 20)
> #define LED_BLINK_DISABLE (1 << 21)
> #define LED_SYSFS_DISABLE (1 << 22)
> -#define SET_BRIGHTNESS_ASYNC (1 << 23)
> -#define SET_BRIGHTNESS_SYNC (1 << 24)
> -#define LED_DEV_CAP_FLASH (1 << 25)
> +#define LED_DEV_CAP_FLASH (1 << 23)
>
> /* Set LED brightness level */
> /* Must not sleep, use a workqueue if needed */
> @@ -159,6 +157,21 @@ extern void led_blink_set_oneshot(struct led_classdev *led_cdev,
> */
> extern void led_set_brightness(struct led_classdev *led_cdev,
> enum led_brightness brightness);
> +
> +/**
> + * led_set_brightness_sync - set LED brightness synchronously
> + * @led_cdev: the LED to set
> + * @brightness: the brightness to set it to
> + *
> + * Set an LED's brightness immediately. This function will block
> + * the caller for the time required for accessing device register,
registers - plural.
Andrew
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