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/*
* Copyright (c) 2020 Seagate Technology LLC
* Copyright (c) 2022 Grinn
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief LP50xx LED controller
*/
#include <errno.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/led.h>
#include <zephyr/drivers/led/lp50xx.h>
#include <zephyr/kernel.h>
#include <zephyr/pm/device.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(lp50xx, CONFIG_LED_LOG_LEVEL);
#define LP50XX_MIN_BRIGHTNESS 0U
#define LP50XX_MAX_BRIGHTNESS 100U
/*
* Number of supported RGB led modules per chipset.
*
* For each module, there are 4 associated registers:
* - 1 brightness register
* - 3 color registers (RGB)
*
* A chipset can have more modules than leds. In this case, the
* associated registers will simply be inactive.
*/
#define LP5012_NUM_MODULES 4
#define LP5024_NUM_MODULES 8
#define LP5036_NUM_MODULES 12
/* Maximum number of channels */
#define LP50XX_MAX_CHANNELS(nmodules) \
((LP50XX_COLORS_PER_LED + 1) * ((nmodules) + 1))
#define LP50XX_DISABLE_DELAY_US 3
#define LP50XX_ENABLE_DELAY_US 500
/* Base registers */
#define LP50XX_DEVICE_CONFIG0 0x00
#define LP50XX_DEVICE_CONFIG1 0x01
#define LP50XX_LED_CONFIG0 0x02
#define LP50XX_BANK_BASE(nmodules) \
(0x03 + (((nmodules) - 1) / 8))
#define LP50XX_LED0_BRIGHTNESS(nmodules) \
((LP50XX_BANK_BASE(nmodules)) + 4)
#define LP50XX_OUT0_COLOR(nmodules) \
(LP50XX_LED0_BRIGHTNESS(nmodules) + (nmodules))
#define LP50XX_RESET(nmodules) \
(LP50XX_OUT0_COLOR(nmodules) + LP50XX_COLORS_PER_LED * (nmodules))
/* Register values */
#define CONFIG0_CHIP_EN BIT(6)
#define CONFIG1_LED_GLOBAL_OFF BIT(0)
#define CONFIG1_MAX_CURRENT_OPT BIT(1)
#define CONFIG1_PWM_DITHERING_EN BIT(2)
#define CONFIG1_AUTO_INCR_EN BIT(3)
#define CONFIG1_POWER_SAVE_EN BIT(4)
#define CONFIG1_LOG_SCALE_EN BIT(5)
#define RESET_SW 0xFF
struct lp50xx_config {
struct i2c_dt_spec bus;
const struct gpio_dt_spec gpio_enable;
uint8_t num_modules;
uint8_t max_leds;
uint8_t num_leds;
bool log_scale_en;
bool max_curr_opt;
const struct led_info *leds_info;
};
struct lp50xx_data {
uint8_t *chan_buf;
};
static const struct led_info *lp50xx_led_to_info(
const struct lp50xx_config *config, uint32_t led)
{
if (led < config->num_leds) {
return &config->leds_info[led];
}
return NULL;
}
static int lp50xx_get_info(const struct device *dev, uint32_t led,
const struct led_info **info)
{
const struct lp50xx_config *config = dev->config;
const struct led_info *led_info = lp50xx_led_to_info(config, led);
if (!led_info) {
return -EINVAL;
}
*info = led_info;
return 0;
}
static int lp50xx_set_brightness(const struct device *dev,
uint32_t led, uint8_t value)
{
const struct lp50xx_config *config = dev->config;
const struct led_info *led_info = lp50xx_led_to_info(config, led);
uint8_t buf[2];
if (!led_info) {
return -ENODEV;
}
if (!IN_RANGE(value, LP50XX_MIN_BRIGHTNESS, LP50XX_MAX_BRIGHTNESS)) {
LOG_ERR("%s: brightness value out of bounds: "
"val=%d, min=%d, max=%d",
dev->name,
value,
LP50XX_MIN_BRIGHTNESS,
LP50XX_MAX_BRIGHTNESS);
return -EINVAL;
}
buf[0] = LP50XX_LED0_BRIGHTNESS(config->num_modules) + led_info->index;
buf[1] = (value * 0xff) / 100;
return i2c_write_dt(&config->bus, buf, sizeof(buf));
}
static int lp50xx_on(const struct device *dev, uint32_t led)
{
return lp50xx_set_brightness(dev, led, 100);
}
static int lp50xx_off(const struct device *dev, uint32_t led)
{
return lp50xx_set_brightness(dev, led, 0);
}
static int lp50xx_set_color(const struct device *dev, uint32_t led,
uint8_t num_colors, const uint8_t *color)
{
const struct lp50xx_config *config = dev->config;
const struct led_info *led_info = lp50xx_led_to_info(config, led);
uint8_t buf[4];
if (!led_info) {
return -ENODEV;
}
if (num_colors != led_info->num_colors) {
LOG_ERR("%s: invalid number of colors: got=%d, expected=%d",
dev->name,
num_colors,
led_info->num_colors);
return -EINVAL;
}
buf[0] = LP50XX_OUT0_COLOR(config->num_modules);
buf[0] += LP50XX_COLORS_PER_LED * led_info->index;
buf[1] = color[0];
buf[2] = color[1];
buf[3] = color[2];
return i2c_write_dt(&config->bus, buf, sizeof(buf));
}
static int lp50xx_write_channels(const struct device *dev,
uint32_t start_channel,
uint32_t num_channels, const uint8_t *buf)
{
const struct lp50xx_config *config = dev->config;
struct lp50xx_data *data = dev->data;
uint8_t base_channel, end_channel, max_channels;
base_channel = LP50XX_BANK_BASE(config->num_modules);
end_channel = base_channel + start_channel + num_channels;
max_channels = base_channel + LP50XX_MAX_CHANNELS(config->num_modules);
if (end_channel > max_channels) {
return -EINVAL;
}
/*
* Unfortunately this controller doesn't support commands split into
* two I2C messages.
*/
data->chan_buf[0] = base_channel + start_channel;
memcpy(data->chan_buf + 1, buf, num_channels);
return i2c_write_dt(&config->bus, data->chan_buf, num_channels + 1);
}
static int lp50xx_reset(const struct device *dev)
{
const struct lp50xx_config *config = dev->config;
uint8_t buf[2];
int err;
/* Software reset */
buf[0] = LP50XX_RESET(config->num_modules);
buf[1] = RESET_SW;
err = i2c_write_dt(&config->bus, buf, 2);
if (err < 0) {
return err;
}
/* After reset, apply configuration since all registers are reset. */
buf[0] = LP50XX_DEVICE_CONFIG1;
buf[1] = CONFIG1_PWM_DITHERING_EN | CONFIG1_AUTO_INCR_EN
| CONFIG1_POWER_SAVE_EN;
if (config->max_curr_opt) {
buf[1] |= CONFIG1_MAX_CURRENT_OPT;
}
if (config->log_scale_en) {
buf[1] |= CONFIG1_LOG_SCALE_EN;
}
return i2c_write_dt(&config->bus, buf, 2);
}
static int lp50xx_hw_enable(const struct device *dev, bool enable)
{
const struct lp50xx_config *config = dev->config;
int err;
if (config->gpio_enable.port == NULL) {
/* Nothing to do */
return 0;
}
err = gpio_pin_set_dt(&config->gpio_enable, enable);
if (err < 0) {
LOG_ERR("%s: failed to set enable gpio", dev->name);
return err;
}
k_usleep(enable ? LP50XX_ENABLE_DELAY_US : LP50XX_DISABLE_DELAY_US);
return 0;
}
static int lp50xx_enable(const struct device *dev, bool enable)
{
const struct lp50xx_config *config = dev->config;
uint8_t value = enable ? CONFIG0_CHIP_EN : 0;
return i2c_reg_update_byte_dt(&config->bus,
LP50XX_DEVICE_CONFIG0,
CONFIG0_CHIP_EN,
value);
}
static int lp50xx_init(const struct device *dev)
{
const struct lp50xx_config *config = dev->config;
int err;
if (!i2c_is_ready_dt(&config->bus)) {
LOG_ERR("%s: I2C device not ready", dev->name);
return -ENODEV;
}
if (config->num_leds > config->max_leds) {
LOG_ERR("%s: invalid number of LEDs %d (max %d)",
dev->name,
config->num_leds,
config->max_leds);
return -EINVAL;
}
/* Configure GPIO if present */
if (config->gpio_enable.port != NULL) {
if (!gpio_is_ready_dt(&config->gpio_enable)) {
LOG_ERR("%s: enable gpio is not ready", dev->name);
return -ENODEV;
}
err = gpio_pin_configure_dt(&config->gpio_enable,
GPIO_OUTPUT_INACTIVE);
if (err < 0) {
LOG_ERR("%s: failed to initialize enable gpio",
dev->name);
return err;
}
}
/* Enable hardware */
err = lp50xx_hw_enable(dev, true);
if (err < 0) {
LOG_ERR("%s: failed to enable hardware", dev->name);
return err;
}
/* Reset device */
err = lp50xx_reset(dev);
if (err < 0) {
LOG_ERR("%s: failed to reset", dev->name);
return err;
}
/* Enable device */
err = lp50xx_enable(dev, true);
if (err < 0) {
LOG_ERR("%s: failed to enable", dev->name);
return err;
}
return 0;
}
#ifdef CONFIG_PM_DEVICE
static int lp50xx_pm_action(const struct device *dev,
enum pm_device_action action)
{
switch (action) {
case PM_DEVICE_ACTION_SUSPEND:
return lp50xx_enable(dev, false);
case PM_DEVICE_ACTION_RESUME:
return lp50xx_enable(dev, true);
default:
return -ENOTSUP;
}
return 0;
}
#endif /* CONFIG_PM_DEVICE */
static const struct led_driver_api lp50xx_led_api = {
.on = lp50xx_on,
.off = lp50xx_off,
.get_info = lp50xx_get_info,
.set_brightness = lp50xx_set_brightness,
.set_color = lp50xx_set_color,
.write_channels = lp50xx_write_channels,
};
#define COLOR_MAPPING(led_node_id) \
const uint8_t color_mapping_##led_node_id[] = \
DT_PROP(led_node_id, color_mapping);
#define LED_INFO(led_node_id) \
{ \
.label = DT_PROP(led_node_id, label), \
.index = DT_PROP(led_node_id, index), \
.num_colors = \
DT_PROP_LEN(led_node_id, color_mapping), \
.color_mapping = color_mapping_##led_node_id, \
},
#define LP50XX_DEVICE(n, id, nmodules) \
DT_INST_FOREACH_CHILD(n, COLOR_MAPPING) \
\
static const struct led_info lp##id##_leds_##n[] = { \
DT_INST_FOREACH_CHILD(n, LED_INFO) \
}; \
\
static const struct lp50xx_config lp##id##_config_##n = { \
.bus = I2C_DT_SPEC_INST_GET(n), \
.gpio_enable = \
GPIO_DT_SPEC_INST_GET_OR(n, enable_gpios, {0}), \
.num_modules = nmodules, \
.max_leds = LP##id##_MAX_LEDS, \
.num_leds = ARRAY_SIZE(lp##id##_leds_##n), \
.log_scale_en = DT_INST_PROP(n, log_scale_en), \
.max_curr_opt = DT_INST_PROP(n, max_curr_opt), \
.leds_info = lp##id##_leds_##n, \
}; \
\
static uint8_t lp##id##_chan_buf_##n[LP50XX_MAX_CHANNELS(nmodules) + 1];\
\
static struct lp50xx_data lp##id##_data_##n = { \
.chan_buf = lp##id##_chan_buf_##n, \
}; \
\
PM_DEVICE_DT_INST_DEFINE(n, lp50xx_pm_action); \
\
DEVICE_DT_INST_DEFINE(n, \
lp50xx_init, \
PM_DEVICE_DT_INST_GET(n), \
&lp##id##_data_##n, \
&lp##id##_config_##n, \
POST_KERNEL, CONFIG_LED_INIT_PRIORITY, \
&lp50xx_led_api);
#undef DT_DRV_COMPAT
#define DT_DRV_COMPAT ti_lp5009
DT_INST_FOREACH_STATUS_OKAY_VARGS(LP50XX_DEVICE, 5009, LP5012_NUM_MODULES)
#undef DT_DRV_COMPAT
#define DT_DRV_COMPAT ti_lp5012
DT_INST_FOREACH_STATUS_OKAY_VARGS(LP50XX_DEVICE, 5012, LP5012_NUM_MODULES)
#undef DT_DRV_COMPAT
#define DT_DRV_COMPAT ti_lp5018
DT_INST_FOREACH_STATUS_OKAY_VARGS(LP50XX_DEVICE, 5018, LP5024_NUM_MODULES)
#undef DT_DRV_COMPAT
#define DT_DRV_COMPAT ti_lp5024
DT_INST_FOREACH_STATUS_OKAY_VARGS(LP50XX_DEVICE, 5024, LP5024_NUM_MODULES)
#undef DT_DRV_COMPAT
#define DT_DRV_COMPAT ti_lp5030
DT_INST_FOREACH_STATUS_OKAY_VARGS(LP50XX_DEVICE, 5030, LP5036_NUM_MODULES)
#undef DT_DRV_COMPAT
#define DT_DRV_COMPAT ti_lp5036
DT_INST_FOREACH_STATUS_OKAY_VARGS(LP50XX_DEVICE, 5036, LP5036_NUM_MODULES)