// SPDX-License-Identifier: GPL-2.0 // // Copyright (C) 2018 BayLibre SAS // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com> // // LED driver for MAXIM 77650/77651 charger/power-supply. #include <linux/i2c.h> #include <linux/leds.h> #include <linux/mfd/max77650.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #define MAX77650_LED_NUM_LEDS 3 #define MAX77650_LED_A_BASE 0x40 #define MAX77650_LED_B_BASE 0x43 #define MAX77650_LED_BR_MASK GENMASK(4, 0) #define MAX77650_LED_EN_MASK GENMASK(7, 6) #define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK /* Enable EN_LED_MSTR. */ #define MAX77650_LED_TOP_DEFAULT BIT(0) #define MAX77650_LED_ENABLE GENMASK(7, 6) #define MAX77650_LED_DISABLE 0x00 #define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE /* 100% on duty */ #define MAX77650_LED_B_DEFAULT GENMASK(3, 0) struct max77650_led { struct led_classdev cdev; struct regmap *map; unsigned int regA; unsigned int regB; }; static struct max77650_led *max77650_to_led(struct led_classdev *cdev) { return container_of(cdev, struct max77650_led, cdev); } static int max77650_led_brightness_set(struct led_classdev *cdev, enum led_brightness brightness) { struct max77650_led *led = max77650_to_led(cdev); int val, mask; mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK; if (brightness == LED_OFF) val = MAX77650_LED_DISABLE; else val = MAX77650_LED_ENABLE | brightness; return regmap_update_bits(led->map, led->regA, mask, val); } static int max77650_led_probe(struct platform_device *pdev) { struct fwnode_handle *child; struct max77650_led *leds, *led; struct device *dev; struct regmap *map; int rv, num_leds; u32 reg; dev = &pdev->dev; leds = devm_kcalloc(dev, sizeof(*leds), MAX77650_LED_NUM_LEDS, GFP_KERNEL); if (!leds) return -ENOMEM; map = dev_get_regmap(dev->parent, NULL); if (!map) return -ENODEV; num_leds = device_get_child_node_count(dev); if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS) return -ENODEV; device_for_each_child_node(dev, child) { struct led_init_data init_data = {}; rv = fwnode_property_read_u32(child, "reg", ®); if (rv || reg >= MAX77650_LED_NUM_LEDS) { rv = -EINVAL; goto err_node_put; } led = &leds[reg]; led->map = map; led->regA = MAX77650_LED_A_BASE + reg; led->regB = MAX77650_LED_B_BASE + reg; led->cdev.brightness_set_blocking = max77650_led_brightness_set; led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS; init_data.fwnode = child; init_data.devicename = "max77650"; /* for backwards compatibility if `label` is not present */ init_data.default_label = ":"; rv = devm_led_classdev_register_ext(dev, &led->cdev, &init_data); if (rv) goto err_node_put; rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT); if (rv) goto err_node_put; rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT); if (rv) goto err_node_put; } return regmap_write(map, MAX77650_REG_CNFG_LED_TOP, MAX77650_LED_TOP_DEFAULT); err_node_put: fwnode_handle_put(child); return rv; } static const struct of_device_id max77650_led_of_match[] = { { .compatible = "maxim,max77650-led" }, { } }; MODULE_DEVICE_TABLE(of, max77650_led_of_match); static struct platform_driver max77650_led_driver = { .driver = { .name = "max77650-led", .of_match_table = max77650_led_of_match, }, .probe = max77650_led_probe, }; module_platform_driver(max77650_led_driver); MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver"); MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:max77650-led");