1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Copyright (C) 2018 BayLibre SAS |
4 | // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com> |
5 | // |
6 | // LED driver for MAXIM 77650/77651 charger/power-supply. |
7 | |
8 | #include <linux/i2c.h> |
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> |
14 | |
15 | #define MAX77650_LED_NUM_LEDS 3 |
16 | |
17 | #define MAX77650_LED_A_BASE 0x40 |
18 | #define MAX77650_LED_B_BASE 0x43 |
19 | |
20 | #define MAX77650_LED_BR_MASK GENMASK(4, 0) |
21 | #define MAX77650_LED_EN_MASK GENMASK(7, 6) |
22 | |
23 | #define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK |
24 | |
25 | /* Enable EN_LED_MSTR. */ |
26 | #define MAX77650_LED_TOP_DEFAULT BIT(0) |
27 | |
28 | #define MAX77650_LED_ENABLE GENMASK(7, 6) |
29 | #define MAX77650_LED_DISABLE 0x00 |
30 | |
31 | #define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE |
32 | /* 100% on duty */ |
33 | #define MAX77650_LED_B_DEFAULT GENMASK(3, 0) |
34 | |
35 | struct max77650_led { |
36 | struct led_classdev cdev; |
37 | struct regmap *map; |
38 | unsigned int regA; |
39 | unsigned int regB; |
40 | }; |
41 | |
42 | static struct max77650_led *max77650_to_led(struct led_classdev *cdev) |
43 | { |
44 | return container_of(cdev, struct max77650_led, cdev); |
45 | } |
46 | |
47 | static int max77650_led_brightness_set(struct led_classdev *cdev, |
48 | enum led_brightness brightness) |
49 | { |
50 | struct max77650_led *led = max77650_to_led(cdev); |
51 | int val, mask; |
52 | |
53 | mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK; |
54 | |
55 | if (brightness == LED_OFF) |
56 | val = MAX77650_LED_DISABLE; |
57 | else |
58 | val = MAX77650_LED_ENABLE | brightness; |
59 | |
60 | return regmap_update_bits(map: led->map, reg: led->regA, mask, val); |
61 | } |
62 | |
63 | static int max77650_led_probe(struct platform_device *pdev) |
64 | { |
65 | struct fwnode_handle *child; |
66 | struct max77650_led *leds, *led; |
67 | struct device *dev; |
68 | struct regmap *map; |
69 | int rv, num_leds; |
70 | u32 reg; |
71 | |
72 | dev = &pdev->dev; |
73 | |
74 | leds = devm_kcalloc(dev, n: sizeof(*leds), |
75 | MAX77650_LED_NUM_LEDS, GFP_KERNEL); |
76 | if (!leds) |
77 | return -ENOMEM; |
78 | |
79 | map = dev_get_regmap(dev: dev->parent, NULL); |
80 | if (!map) |
81 | return -ENODEV; |
82 | |
83 | num_leds = device_get_child_node_count(dev); |
84 | if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS) |
85 | return -ENODEV; |
86 | |
87 | device_for_each_child_node(dev, child) { |
88 | struct led_init_data init_data = {}; |
89 | |
90 | rv = fwnode_property_read_u32(fwnode: child, propname: "reg" , val: ®); |
91 | if (rv || reg >= MAX77650_LED_NUM_LEDS) { |
92 | rv = -EINVAL; |
93 | goto err_node_put; |
94 | } |
95 | |
96 | led = &leds[reg]; |
97 | led->map = map; |
98 | led->regA = MAX77650_LED_A_BASE + reg; |
99 | led->regB = MAX77650_LED_B_BASE + reg; |
100 | led->cdev.brightness_set_blocking = max77650_led_brightness_set; |
101 | led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS; |
102 | |
103 | init_data.fwnode = child; |
104 | init_data.devicename = "max77650" ; |
105 | /* for backwards compatibility if `label` is not present */ |
106 | init_data.default_label = ":" ; |
107 | |
108 | rv = devm_led_classdev_register_ext(parent: dev, led_cdev: &led->cdev, |
109 | init_data: &init_data); |
110 | if (rv) |
111 | goto err_node_put; |
112 | |
113 | rv = regmap_write(map, reg: led->regA, MAX77650_LED_A_DEFAULT); |
114 | if (rv) |
115 | goto err_node_put; |
116 | |
117 | rv = regmap_write(map, reg: led->regB, MAX77650_LED_B_DEFAULT); |
118 | if (rv) |
119 | goto err_node_put; |
120 | } |
121 | |
122 | return regmap_write(map, |
123 | MAX77650_REG_CNFG_LED_TOP, |
124 | MAX77650_LED_TOP_DEFAULT); |
125 | err_node_put: |
126 | fwnode_handle_put(fwnode: child); |
127 | return rv; |
128 | } |
129 | |
130 | static const struct of_device_id max77650_led_of_match[] = { |
131 | { .compatible = "maxim,max77650-led" }, |
132 | { } |
133 | }; |
134 | MODULE_DEVICE_TABLE(of, max77650_led_of_match); |
135 | |
136 | static struct platform_driver max77650_led_driver = { |
137 | .driver = { |
138 | .name = "max77650-led" , |
139 | .of_match_table = max77650_led_of_match, |
140 | }, |
141 | .probe = max77650_led_probe, |
142 | }; |
143 | module_platform_driver(max77650_led_driver); |
144 | |
145 | MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver" ); |
146 | MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>" ); |
147 | MODULE_LICENSE("GPL v2" ); |
148 | MODULE_ALIAS("platform:max77650-led" ); |
149 | |