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/* SPDX-License-Identifier: GPL-2.0 */
/* LED Multicolor class interface
* Copyright (C) 2019-20 Texas Instruments Incorporated - http://www.ti.com/
*/
#ifndef _LINUX_MULTICOLOR_LEDS_H_INCLUDED
#define _LINUX_MULTICOLOR_LEDS_H_INCLUDED
#include <linux/leds.h>
#include <dt-bindings/leds/common.h>
/**
* struct mc_subled - Color component description.
* @color_index: Color ID.
* @brightness: Scaled intensity.
* @intensity: Current intensity.
* @max_intensity: Maximum supported intensity value.
* @channel: Channel index.
*
* Describes a color component of a multicolor LED. Many multicolor LEDs
* do not support global brightness control in hardware, so they use
* the brightness field in connection with led_mc_calc_color_components()
* to perform the intensity scaling in software.
* Such drivers should set max_intensity to 0 to signal the multicolor LED core
* that the maximum global brightness of the LED class device should be used for
* limiting incoming intensity values.
*
* Multicolor LEDs that do support global brightness control in hardware
* should instead set max_intensity to the maximum intensity value supported
* by the hardware for a given color component.
*/
struct mc_subled {
unsigned int color_index;
unsigned int brightness;
unsigned int intensity;
unsigned int max_intensity;
unsigned int channel;
};
struct led_classdev_mc {
/* led class device */
struct led_classdev led_cdev;
unsigned int num_colors;
struct mc_subled *subled_info;
};
static inline struct led_classdev_mc *lcdev_to_mccdev(
struct led_classdev *led_cdev)
{
return container_of(led_cdev, struct led_classdev_mc, led_cdev);
}
/**
* led_classdev_multicolor_register_ext - register a new object of led_classdev
* class with support for multicolor LEDs
* @parent: the multicolor LED to register
* @mcled_cdev: the led_classdev_mc structure for this device
* @init_data: the LED class multicolor device initialization data
*
* Returns: 0 on success or negative error value on failure
*/
int led_classdev_multicolor_register_ext(struct device *parent,
struct led_classdev_mc *mcled_cdev,
struct led_init_data *init_data);
/**
* led_classdev_multicolor_unregister - unregisters an object of led_classdev
* class with support for multicolor LEDs
* @mcled_cdev: the multicolor LED to unregister
*
* Unregister a previously registered via led_classdev_multicolor_register
* object
*/
void led_classdev_multicolor_unregister(struct led_classdev_mc *mcled_cdev);
/**
* led_mc_calc_color_components() - Calculates component brightness values of a LED cluster.
* @mcled_cdev - Multicolor LED class device of the LED cluster.
* @brightness - Global brightness of the LED cluster.
*
* Calculates the brightness values for each color component of a monochrome LED cluster,
* see Documentation/leds/leds-class-multicolor.rst for details.
*/
int led_mc_calc_color_components(struct led_classdev_mc *mcled_cdev,
enum led_brightness brightness);
int devm_led_classdev_multicolor_register_ext(struct device *parent,
struct led_classdev_mc *mcled_cdev,
struct led_init_data *init_data);
void devm_led_classdev_multicolor_unregister(struct device *parent,
struct led_classdev_mc *mcled_cdev);
static inline int led_classdev_multicolor_register(struct device *parent,
struct led_classdev_mc *mcled_cdev)
{
return led_classdev_multicolor_register_ext(parent, mcled_cdev, NULL);
}
static inline int devm_led_classdev_multicolor_register(struct device *parent,
struct led_classdev_mc *mcled_cdev)
{
return devm_led_classdev_multicolor_register_ext(parent, mcled_cdev,
NULL);
}
#endif /* _LINUX_MULTICOLOR_LEDS_H_INCLUDED */
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