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* Copyright (c) 2017 Linaro Limited
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef _ZEPHYR_LED_STRIP_H
#define _ZEPHYR_LED_STRIP_H
/**
* @file
* @brief Public API for controlling linear strips of LEDs.
*
* This library abstracts the chipset drivers for individually
* addressable strips of LEDs.
*/
#include <zephyr/types.h>
#include <device.h>
/**
* @brief Color value for a single RGB LED.
*
* Individual strip drivers may ignore lower-order bits if their
* resolution in any channel is less than a full byte.
*/
struct led_rgb {
#ifdef CONFIG_LED_STRIP_RGB_SCRATCH
/*
* Pad/scratch space needed by some drivers. Users should
* ignore.
*/
u8_t scratch;
#endif
/** Red channel */
u8_t r;
/** Green channel */
u8_t g;
/** Blue channel */
u8_t b;
};
/**
* @typedef led_api_update_rgb
* @brief Callback API for updating an RGB LED strip
*
* @see led_strip_update_rgb() for argument descriptions.
*/
typedef int (*led_api_update_rgb)(struct device *dev, struct led_rgb *pixels,
size_t num_pixels);
/**
* @typedef led_api_update_channels
* @brief Callback API for updating channels without an RGB interpretation.
*
* @see led_strip_update_channels() for argument descriptions.
*/
typedef int (*led_api_update_channels)(struct device *dev, u8_t *channels,
size_t num_channels);
/**
* @brief LED strip driver API
*
* This is the mandatory API any LED strip driver needs to expose.
*/
struct led_strip_driver_api {
led_api_update_rgb update_rgb;
led_api_update_channels update_channels;
};
/**
* @brief Update an LED strip made of RGB pixels
*
* Important:
* This routine may overwrite @a pixels.
*
* This routine immediately updates the strip display according to the
* given pixels array.
*
* @param dev LED strip device
* @param pixels Array of pixel data
* @param num_pixels Length of pixels array
* @return 0 on success, negative on error
* @warning May overwrite @a pixels
*/
static inline int led_strip_update_rgb(struct device *dev,
struct led_rgb *pixels,
size_t num_pixels) {
const struct led_strip_driver_api *api = dev->driver_api;
return api->update_rgb(dev, pixels, num_pixels);
}
/**
* @brief Update an LED strip on a per-channel basis.
*
* Important:
* This routine may overwrite @a channels.
*
* This routine immediately updates the strip display according to the
* given channels array. Each channel byte corresponds to an
* individually addressable color channel or LED. Channels
* are updated linearly in strip order.
*
* @param dev LED strip device
* @param channels Array of per-channel data
* @param num_channels Length of channels array
* @return 0 on success, negative on error
* @warning May overwrite @a channels
*/
static inline int led_strip_update_channels(struct device *dev,
u8_t *channels,
size_t num_channels) {
const struct led_strip_driver_api *api = dev->driver_api;
return api->update_channels(dev, channels, num_channels);
}
#endif /* _ZEPHYR_LED_STRIP_H */
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