--- /dev/null
+// 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");
projects / thirdparty / kernel / stable.git / commitdiff
