From 5607ca92e6274dfb85d0ff7c4e91e6c4ddb6d25c Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Fri, 31 May 2024 13:41:22 +0200 Subject: leds: core: Add led_mc_set_brightness() function Add a new led_mc_set_brightness() function for in kernel color/brightness changing of multi-color LEDs. led-class-multicolor can be build as a module and led_mc_set_brightness() will have the builtin callers, so put led_mc_set_brightness() inside led-core instead, just like how led_set_brightness() is part of the core and not of the led-class object. This also adds a new LED_MULTI_COLOR led_classdev flag to allow led_mc_set_brightness() to verify that it is operating on a multi-color LED classdev, avoiding casting the passed in LED classdev to a multi-color LED classdev, when it actually is not a multi-color LED. Signed-off-by: Hans de Goede Reviewed-by: Jacek Anaszewski Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20240531114124.45346-5-hdegoede@redhat.com Signed-off-by: Lee Jones --- include/linux/leds.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'include') diff --git a/include/linux/leds.h b/include/linux/leds.h index 6300313c46b7..ae07e44f1dcb 100644 --- a/include/linux/leds.h +++ b/include/linux/leds.h @@ -107,6 +107,7 @@ struct led_classdev { #define LED_BRIGHT_HW_CHANGED BIT(21) #define LED_RETAIN_AT_SHUTDOWN BIT(22) #define LED_INIT_DEFAULT_TRIGGER BIT(23) +#define LED_MULTI_COLOR BIT(24) /* set_brightness_work / blink_timer flags, atomic, private. */ unsigned long work_flags; @@ -373,6 +374,25 @@ void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness); */ int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value); +/** + * led_mc_set_brightness - set mc LED color intensity values and brightness + * @led_cdev: the LED to set + * @intensity_value: array of per color intensity values to set + * @num_colors: amount of entries in intensity_value array + * @brightness: the brightness to set the LED to + * + * Set a multi-color LED's per color intensity values and brightness. + * If necessary, this cancels the software blink timer. This function is + * guaranteed not to sleep. + * + * Calling this function on a non multi-color led_classdev or with the wrong + * num_colors value is an error. In this case an error will be logged once + * and the call will do nothing. + */ +void led_mc_set_brightness(struct led_classdev *led_cdev, + unsigned int *intensity_value, unsigned int num_colors, + unsigned int brightness); + /** * led_update_brightness - update LED brightness * @led_cdev: the LED to query -- cgit v1.2.3