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/*
* Copyright (c) 2023 Phytec Messtechnik GmbH.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT ti_lp5569
/**
* @file
* @brief LP5569 LED controller
*
* The LP5569 is a 9-channel LED driver that communicates over I2C.
*/
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/led.h>
#include <zephyr/device.h>
#include <zephyr/pm/device.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(lp5569, CONFIG_LED_LOG_LEVEL);
#define LP5569_NUM_LEDS 9
/* General Registers */
#define LP5569_CONFIG 0x00
#define LP5569_CHIP_EN BIT(6)
#define LP5569_MISC 0x2F
#define LP5569_POWERSAVE_EN BIT(5)
/* PWM base Register for controlling the duty-cycle */
#define LP5569_LED0_PWM 0x16
struct lp5569_config {
struct i2c_dt_spec bus;
};
static int lp5569_led_set_brightness(const struct device *dev, uint32_t led,
uint8_t brightness)
{
const struct lp5569_config *config = dev->config;
uint8_t val;
int ret;
if (led >= LP5569_NUM_LEDS || brightness > 100) {
return -EINVAL;
}
/* Map 0-100 % to 0-255 pwm register value */
val = brightness * 255 / 100;
ret = i2c_reg_write_byte_dt(&config->bus, LP5569_LED0_PWM + led, val);
if (ret < 0) {
LOG_ERR("LED reg update failed");
return ret;
}
return 0;
}
static inline int lp5569_led_on(const struct device *dev, uint32_t led)
{
/* Set LED brightness to 100 % */
return lp5569_led_set_brightness(dev, led, 100);
}
static inline int lp5569_led_off(const struct device *dev, uint32_t led)
{
/* Set LED brightness to 0 % */
return lp5569_led_set_brightness(dev, led, 0);
}
static int lp5569_enable(const struct device *dev)
{
const struct lp5569_config *config = dev->config;
int ret;
if (!i2c_is_ready_dt(&config->bus)) {
LOG_ERR("I2C device not ready");
return -ENODEV;
}
ret = i2c_reg_write_byte_dt(&config->bus, LP5569_CONFIG,
LP5569_CHIP_EN);
if (ret < 0) {
LOG_ERR("Enable LP5569 failed");
return ret;
}
ret = i2c_reg_write_byte_dt(&config->bus, LP5569_MISC,
LP5569_POWERSAVE_EN);
if (ret < 0) {
LOG_ERR("LED reg update failed");
return ret;
}
return 0;
}
static int lp5569_init(const struct device *dev)
{
/* If the device is behind a power domain, it will start in
* PM_DEVICE_STATE_OFF.
*/
if (pm_device_on_power_domain(dev)) {
pm_device_init_off(dev);
LOG_INF("Init %s as PM_DEVICE_STATE_OFF", dev->name);
return 0;
}
return lp5569_enable(dev);
}
#ifdef CONFIG_PM_DEVICE
static int lp5569_pm_action(const struct device *dev,
enum pm_device_action action)
{
const struct lp5569_config *config = dev->config;
int ret;
switch (action) {
case PM_DEVICE_ACTION_TURN_ON:
case PM_DEVICE_ACTION_RESUME:
ret = lp5569_enable(dev);
if (ret < 0) {
LOG_ERR("Enable LP5569 failed");
return ret;
}
break;
case PM_DEVICE_ACTION_TURN_OFF:
case PM_DEVICE_ACTION_SUSPEND:
ret = i2c_reg_update_byte_dt(&config->bus, LP5569_CONFIG,
LP5569_CHIP_EN, 0);
if (ret < 0) {
LOG_ERR("Disable LP5569 failed");
return ret;
}
break;
default:
return -ENOTSUP;
}
return 0;
}
#endif /* CONFIG_PM_DEVICE */
static const struct led_driver_api lp5569_led_api = {
.set_brightness = lp5569_led_set_brightness,
.on = lp5569_led_on,
.off = lp5569_led_off,
};
#define LP5569_DEFINE(id) \
static const struct lp5569_config lp5569_config_##id = { \
.bus = I2C_DT_SPEC_INST_GET(id), \
}; \
\
PM_DEVICE_DT_INST_DEFINE(id, lp5569_pm_action); \
\
DEVICE_DT_INST_DEFINE(id, &lp5569_init, \
PM_DEVICE_DT_INST_GET(id), \
NULL, \
&lp5569_config_##id, POST_KERNEL, \
CONFIG_LED_INIT_PRIORITY, \
&lp5569_led_api);
DT_INST_FOREACH_STATUS_OKAY(LP5569_DEFINE)