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// SPDX-License-Identifier: GPL-2.0
/*
* Based on leds-max77650 driver
*
* LED driver for MAXIM 77705 PMIC.
* Copyright (C) 2025 Dzmitry Sankouski <dsankouski@gmail.org>
*/
#include <linux/i2c.h>
#include <linux/led-class-multicolor.h>
#include <linux/leds.h>
#include <linux/mfd/max77705-private.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define MAX77705_LED_NUM_LEDS 4
#define MAX77705_LED_EN_MASK GENMASK(1, 0)
#define MAX77705_LED_MAX_BRIGHTNESS 0xff
#define MAX77705_LED_EN_SHIFT(reg) (reg * MAX77705_RGBLED_EN_WIDTH)
#define MAX77705_LED_REG_BRIGHTNESS(reg) (reg + MAX77705_RGBLED_REG_LED0BRT)
struct max77705_led {
struct led_classdev cdev;
struct led_classdev_mc mcdev;
struct regmap *regmap;
struct mc_subled *subled_info;
};
static const struct regmap_config max77705_leds_regmap_config = {
.reg_base = MAX77705_RGBLED_REG_BASE,
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77705_LED_REG_END,
};
static int max77705_rgb_blink(struct led_classdev *cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct max77705_led *led = container_of(cdev, struct max77705_led, cdev);
int value, on_value, off_value;
if (*delay_on < MAX77705_RGB_DELAY_100_STEP)
on_value = 0;
else if (*delay_on < MAX77705_RGB_DELAY_100_STEP_LIM)
on_value = *delay_on / MAX77705_RGB_DELAY_100_STEP - 1;
else if (*delay_on < MAX77705_RGB_DELAY_250_STEP_LIM)
on_value = (*delay_on - MAX77705_RGB_DELAY_100_STEP_LIM) /
MAX77705_RGB_DELAY_250_STEP +
MAX77705_RGB_DELAY_100_STEP_COUNT;
else
on_value = 15;
on_value <<= 4;
if (*delay_off < 1)
off_value = 0;
else if (*delay_off < MAX77705_RGB_DELAY_500_STEP)
off_value = 1;
else if (*delay_off < MAX77705_RGB_DELAY_500_STEP_LIM)
off_value = *delay_off / MAX77705_RGB_DELAY_500_STEP;
else if (*delay_off < MAX77705_RGB_DELAY_1000_STEP_LIM)
off_value = (*delay_off - MAX77705_RGB_DELAY_1000_STEP_LIM) /
MAX77705_RGB_DELAY_1000_STEP +
MAX77705_RGB_DELAY_500_STEP_COUNT;
else if (*delay_off < MAX77705_RGB_DELAY_2000_STEP_LIM)
off_value = (*delay_off - MAX77705_RGB_DELAY_2000_STEP_LIM) /
MAX77705_RGB_DELAY_2000_STEP +
MAX77705_RGB_DELAY_1000_STEP_COUNT;
else
off_value = 15;
value = on_value | off_value;
return regmap_write(led->regmap, MAX77705_RGBLED_REG_LEDBLNK, value);
}
static int max77705_led_brightness_set(struct regmap *regmap, struct mc_subled *subled,
int num_colors)
{
int ret;
for (int i = 0; i < num_colors; i++) {
unsigned int channel, brightness;
channel = subled[i].channel;
brightness = subled[i].brightness;
if (brightness == LED_OFF) {
/* Flash OFF */
ret = regmap_update_bits(regmap,
MAX77705_RGBLED_REG_LEDEN,
MAX77705_LED_EN_MASK << MAX77705_LED_EN_SHIFT(channel), 0);
} else {
/* Set current */
ret = regmap_write(regmap, MAX77705_LED_REG_BRIGHTNESS(channel),
brightness);
if (ret < 0)
return ret;
ret = regmap_update_bits(regmap,
MAX77705_RGBLED_REG_LEDEN,
LED_ON << MAX77705_LED_EN_SHIFT(channel),
MAX77705_LED_EN_MASK << MAX77705_LED_EN_SHIFT(channel));
}
}
return ret;
}
static int max77705_led_brightness_set_single(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct max77705_led *led = container_of(cdev, struct max77705_led, cdev);
led->subled_info->brightness = brightness;
return max77705_led_brightness_set(led->regmap, led->subled_info, 1);
}
static int max77705_led_brightness_set_multi(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct led_classdev_mc *mcdev = lcdev_to_mccdev(cdev);
struct max77705_led *led = container_of(mcdev, struct max77705_led, mcdev);
led_mc_calc_color_components(mcdev, brightness);
return max77705_led_brightness_set(led->regmap, led->mcdev.subled_info, mcdev->num_colors);
}
static int max77705_parse_subled(struct device *dev, struct fwnode_handle *np,
struct mc_subled *info)
{
u32 color = LED_COLOR_ID_GREEN;
u32 reg;
int ret;
ret = fwnode_property_read_u32(np, "reg", ®);
if (ret || !reg || reg >= MAX77705_LED_NUM_LEDS)
return dev_err_probe(dev, -EINVAL, "invalid \"reg\" of %pOFn\n", np);
info->channel = reg;
ret = fwnode_property_read_u32(np, "color", &color);
if (ret < 0 && ret != -EINVAL)
return dev_err_probe(dev, ret,
"failed to parse \"color\" of %pOF\n", np);
info->color_index = color;
return 0;
}
static int max77705_add_led(struct device *dev, struct regmap *regmap, struct fwnode_handle *np)
{
int ret, i = 0;
unsigned int color, reg;
struct max77705_led *led;
struct led_classdev *cdev;
struct mc_subled *info;
struct fwnode_handle *child;
struct led_init_data init_data = {};
led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
ret = fwnode_property_read_u32(np, "color", &color);
if (ret < 0 && ret != -EINVAL)
return dev_err_probe(dev, ret,
"failed to parse \"color\" of %pOF\n", np);
led->regmap = regmap;
init_data.fwnode = np;
if (color == LED_COLOR_ID_RGB) {
int num_channels = of_get_available_child_count(to_of_node(np));
ret = fwnode_property_read_u32(np, "reg", ®);
if (ret || reg >= MAX77705_LED_NUM_LEDS)
ret = -EINVAL;
info = devm_kcalloc(dev, num_channels, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
cdev = &led->mcdev.led_cdev;
cdev->max_brightness = MAX77705_LED_MAX_BRIGHTNESS;
cdev->brightness_set_blocking = max77705_led_brightness_set_multi;
cdev->blink_set = max77705_rgb_blink;
fwnode_for_each_available_child_node(np, child) {
ret = max77705_parse_subled(dev, child, &info[i]);
if (ret < 0)
return ret;
info[i].intensity = 0;
i++;
}
led->mcdev.subled_info = info;
led->mcdev.num_colors = num_channels;
led->cdev = *cdev;
ret = devm_led_classdev_multicolor_register_ext(dev, &led->mcdev, &init_data);
if (ret)
return ret;
ret = max77705_led_brightness_set_multi(&led->cdev, LED_OFF);
if (ret)
return ret;
} else {
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
max77705_parse_subled(dev, np, info);
led->subled_info = info;
led->cdev.brightness_set_blocking = max77705_led_brightness_set_single;
led->cdev.blink_set = max77705_rgb_blink;
led->cdev.max_brightness = MAX77705_LED_MAX_BRIGHTNESS;
ret = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);
if (ret)
return ret;
ret = max77705_led_brightness_set_single(&led->cdev, LED_OFF);
if (ret)
return ret;
}
return 0;
}
static int max77705_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct i2c_client *i2c = to_i2c_client(pdev->dev.parent);
struct regmap *regmap;
int ret;
regmap = devm_regmap_init_i2c(i2c, &max77705_leds_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap), "Failed to register LEDs regmap\n");
device_for_each_child_node_scoped(dev, child) {
ret = max77705_add_led(dev, regmap, child);
if (ret)
return ret;
}
return 0;
}
static const struct of_device_id max77705_led_of_match[] = {
{ .compatible = "maxim,max77705-rgb" },
{ }
};
MODULE_DEVICE_TABLE(of, max77705_led_of_match);
static struct platform_driver max77705_led_driver = {
.driver = {
.name = "max77705-led",
.of_match_table = max77705_led_of_match,
},
.probe = max77705_led_probe,
};
module_platform_driver(max77705_led_driver);
MODULE_DESCRIPTION("Maxim MAX77705 LED driver");
MODULE_AUTHOR("Dzmitry Sankouski <dsankouski@gmail.com>");
MODULE_LICENSE("GPL");
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