1 // SPDX-License-Identifier: GPL-2.0
3 // Copyright (C) 2018 BayLibre SAS
4 // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
6 // LED driver for MAXIM 77650/77651 charger/power-supply.
9 #include <linux/leds.h>
10 #include <linux/mfd/max77650.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
15 #define MAX77650_LED_NUM_LEDS 3
17 #define MAX77650_LED_A_BASE 0x40
18 #define MAX77650_LED_B_BASE 0x43
20 #define MAX77650_LED_BR_MASK GENMASK(4, 0)
21 #define MAX77650_LED_EN_MASK GENMASK(7, 6)
23 #define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK
25 /* Enable EN_LED_MSTR. */
26 #define MAX77650_LED_TOP_DEFAULT BIT(0)
28 #define MAX77650_LED_ENABLE GENMASK(7, 6)
29 #define MAX77650_LED_DISABLE 0x00
31 #define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE
33 #define MAX77650_LED_B_DEFAULT GENMASK(3, 0)
36 struct led_classdev cdev;
42 static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
44 return container_of(cdev, struct max77650_led, cdev);
47 static int max77650_led_brightness_set(struct led_classdev *cdev,
48 enum led_brightness brightness)
50 struct max77650_led *led = max77650_to_led(cdev);
53 mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK;
55 if (brightness == LED_OFF)
56 val = MAX77650_LED_DISABLE;
58 val = MAX77650_LED_ENABLE | brightness;
60 return regmap_update_bits(led->map, led->regA, mask, val);
63 static int max77650_led_probe(struct platform_device *pdev)
65 struct device_node *of_node, *child;
66 struct max77650_led *leds, *led;
74 of_node = dev->of_node;
79 leds = devm_kcalloc(dev, sizeof(*leds),
80 MAX77650_LED_NUM_LEDS, GFP_KERNEL);
84 map = dev_get_regmap(dev->parent, NULL);
88 num_leds = of_get_child_count(of_node);
89 if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
92 for_each_child_of_node(of_node, child) {
93 rv = of_property_read_u32(child, "reg", ®);
94 if (rv || reg >= MAX77650_LED_NUM_LEDS) {
101 led->regA = MAX77650_LED_A_BASE + reg;
102 led->regB = MAX77650_LED_B_BASE + reg;
103 led->cdev.brightness_set_blocking = max77650_led_brightness_set;
104 led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS;
106 label = of_get_property(child, "label", NULL);
108 led->cdev.name = "max77650::";
110 led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
111 "max77650:%s", label);
112 if (!led->cdev.name) {
118 of_property_read_string(child, "linux,default-trigger",
119 &led->cdev.default_trigger);
121 rv = devm_led_classdev_register(dev, &led->cdev);
125 rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
129 rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
134 return regmap_write(map,
135 MAX77650_REG_CNFG_LED_TOP,
136 MAX77650_LED_TOP_DEFAULT);
142 static struct platform_driver max77650_led_driver = {
144 .name = "max77650-led",
146 .probe = max77650_led_probe,
148 module_platform_driver(max77650_led_driver);
150 MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
151 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
152 MODULE_LICENSE("GPL v2");
153 MODULE_ALIAS("platform:max77650-led");