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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
35struct max77650_led {
36 struct led_classdev cdev;
37 struct regmap *map;
38 unsigned int regA;
39 unsigned int regB;
40};
41
42static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
43{
44 return container_of(cdev, struct max77650_led, cdev);
45}
46
47static 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(led->map, led->regA, mask, val);
61}
62
63static 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, sizeof(*leds),
75 MAX77650_LED_NUM_LEDS, GFP_KERNEL);
76 if (!leds)
77 return -ENOMEM;
78
79 map = dev_get_regmap(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(child, "reg", ®);
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(dev, &led->cdev,
109 &init_data);
110 if (rv)
111 goto err_node_put;
112
113 rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
114 if (rv)
115 goto err_node_put;
116
117 rv = regmap_write(map, 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);
125err_node_put:
126 fwnode_handle_put(child);
127 return rv;
128}
129
130static const struct of_device_id max77650_led_of_match[] = {
131 { .compatible = "maxim,max77650-led" },
132 { }
133};
134MODULE_DEVICE_TABLE(of, max77650_led_of_match);
135
136static 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};
143module_platform_driver(max77650_led_driver);
144
145MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
146MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
147MODULE_LICENSE("GPL v2");
148MODULE_ALIAS("platform:max77650-led");
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
35struct max77650_led {
36 struct led_classdev cdev;
37 struct regmap *map;
38 unsigned int regA;
39 unsigned int regB;
40};
41
42static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
43{
44 return container_of(cdev, struct max77650_led, cdev);
45}
46
47static 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(led->map, led->regA, mask, val);
61}
62
63static 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, sizeof(*leds),
75 MAX77650_LED_NUM_LEDS, GFP_KERNEL);
76 if (!leds)
77 return -ENOMEM;
78
79 map = dev_get_regmap(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(child, "reg", ®);
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(dev, &led->cdev,
109 &init_data);
110 if (rv)
111 goto err_node_put;
112
113 rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
114 if (rv)
115 goto err_node_put;
116
117 rv = regmap_write(map, 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);
125err_node_put:
126 fwnode_handle_put(child);
127 return rv;
128}
129
130static const struct of_device_id max77650_led_of_match[] = {
131 { .compatible = "maxim,max77650-led" },
132 { }
133};
134MODULE_DEVICE_TABLE(of, max77650_led_of_match);
135
136static 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};
143module_platform_driver(max77650_led_driver);
144
145MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
146MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
147MODULE_LICENSE("GPL v2");
148MODULE_ALIAS("platform:max77650-led");