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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // TI LM36274 LED chip family driver | |
c5437338 | 3 | // Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/ |
11e1bbc1 DM |
4 | |
5 | #include <linux/bitops.h> | |
6 | #include <linux/device.h> | |
7 | #include <linux/err.h> | |
8 | #include <linux/leds.h> | |
9 | #include <linux/leds-ti-lmu-common.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/of_device.h> | |
12 | #include <linux/platform_device.h> | |
13 | ||
14 | #include <linux/mfd/ti-lmu.h> | |
15 | #include <linux/mfd/ti-lmu-register.h> | |
16 | ||
17 | #include <uapi/linux/uleds.h> | |
18 | ||
19 | #define LM36274_MAX_STRINGS 4 | |
20 | #define LM36274_BL_EN BIT(4) | |
21 | ||
22 | /** | |
23 | * struct lm36274 | |
24 | * @pdev: platform device | |
25 | * @led_dev: led class device | |
26 | * @lmu_data: Register and setting values for common code | |
27 | * @regmap: Devices register map | |
28 | * @dev: Pointer to the devices device struct | |
29 | * @led_sources - The LED strings supported in this array | |
30 | * @num_leds - Number of LED strings are supported in this array | |
31 | */ | |
32 | struct lm36274 { | |
33 | struct platform_device *pdev; | |
34 | struct led_classdev led_dev; | |
35 | struct ti_lmu_bank lmu_data; | |
36 | struct regmap *regmap; | |
37 | struct device *dev; | |
38 | ||
39 | u32 led_sources[LM36274_MAX_STRINGS]; | |
40 | int num_leds; | |
41 | }; | |
42 | ||
43 | static int lm36274_brightness_set(struct led_classdev *led_cdev, | |
44 | enum led_brightness brt_val) | |
45 | { | |
46 | struct lm36274 *led = container_of(led_cdev, struct lm36274, led_dev); | |
47 | ||
48 | return ti_lmu_common_set_brightness(&led->lmu_data, brt_val); | |
49 | } | |
50 | ||
51 | static int lm36274_init(struct lm36274 *lm36274_data) | |
52 | { | |
53 | int enable_val = 0; | |
54 | int i; | |
55 | ||
56 | for (i = 0; i < lm36274_data->num_leds; i++) | |
57 | enable_val |= (1 << lm36274_data->led_sources[i]); | |
58 | ||
59 | if (!enable_val) { | |
60 | dev_err(lm36274_data->dev, "No LEDs were enabled\n"); | |
61 | return -EINVAL; | |
62 | } | |
63 | ||
64 | enable_val |= LM36274_BL_EN; | |
65 | ||
66 | return regmap_write(lm36274_data->regmap, LM36274_REG_BL_EN, | |
67 | enable_val); | |
68 | } | |
69 | ||
70 | static int lm36274_parse_dt(struct lm36274 *lm36274_data) | |
71 | { | |
72 | struct fwnode_handle *child = NULL; | |
73 | char label[LED_MAX_NAME_SIZE]; | |
74 | struct device *dev = &lm36274_data->pdev->dev; | |
75 | const char *name; | |
76 | int child_cnt; | |
77 | int ret = -EINVAL; | |
78 | ||
79 | /* There should only be 1 node */ | |
80 | child_cnt = device_get_child_node_count(dev); | |
81 | if (child_cnt != 1) | |
82 | return -EINVAL; | |
83 | ||
84 | device_for_each_child_node(dev, child) { | |
85 | ret = fwnode_property_read_string(child, "label", &name); | |
86 | if (ret) | |
87 | snprintf(label, sizeof(label), | |
88 | "%s::", lm36274_data->pdev->name); | |
89 | else | |
90 | snprintf(label, sizeof(label), | |
91 | "%s:%s", lm36274_data->pdev->name, name); | |
92 | ||
ebefec8d | 93 | lm36274_data->num_leds = fwnode_property_count_u32(child, "led-sources"); |
11e1bbc1 DM |
94 | if (lm36274_data->num_leds <= 0) |
95 | return -ENODEV; | |
96 | ||
97 | ret = fwnode_property_read_u32_array(child, "led-sources", | |
98 | lm36274_data->led_sources, | |
99 | lm36274_data->num_leds); | |
100 | if (ret) { | |
101 | dev_err(dev, "led-sources property missing\n"); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | fwnode_property_read_string(child, "linux,default-trigger", | |
106 | &lm36274_data->led_dev.default_trigger); | |
107 | ||
108 | } | |
109 | ||
110 | lm36274_data->lmu_data.regmap = lm36274_data->regmap; | |
111 | lm36274_data->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT; | |
112 | lm36274_data->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB; | |
113 | lm36274_data->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB; | |
114 | ||
115 | lm36274_data->led_dev.name = label; | |
116 | lm36274_data->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT; | |
117 | lm36274_data->led_dev.brightness_set_blocking = lm36274_brightness_set; | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static int lm36274_probe(struct platform_device *pdev) | |
123 | { | |
124 | struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent); | |
125 | struct lm36274 *lm36274_data; | |
126 | int ret; | |
127 | ||
128 | lm36274_data = devm_kzalloc(&pdev->dev, sizeof(*lm36274_data), | |
129 | GFP_KERNEL); | |
130 | if (!lm36274_data) | |
131 | return -ENOMEM; | |
132 | ||
133 | lm36274_data->pdev = pdev; | |
134 | lm36274_data->dev = lmu->dev; | |
135 | lm36274_data->regmap = lmu->regmap; | |
a0972fff | 136 | platform_set_drvdata(pdev, lm36274_data); |
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137 | |
138 | ret = lm36274_parse_dt(lm36274_data); | |
139 | if (ret) { | |
140 | dev_err(lm36274_data->dev, "Failed to parse DT node\n"); | |
141 | return ret; | |
142 | } | |
143 | ||
144 | ret = lm36274_init(lm36274_data); | |
145 | if (ret) { | |
146 | dev_err(lm36274_data->dev, "Failed to init the device\n"); | |
147 | return ret; | |
148 | } | |
149 | ||
a0972fff JH |
150 | return led_classdev_register(lm36274_data->dev, &lm36274_data->led_dev); |
151 | } | |
152 | ||
153 | static int lm36274_remove(struct platform_device *pdev) | |
154 | { | |
155 | struct lm36274 *lm36274_data = platform_get_drvdata(pdev); | |
156 | ||
157 | led_classdev_unregister(&lm36274_data->led_dev); | |
158 | ||
159 | return 0; | |
11e1bbc1 DM |
160 | } |
161 | ||
162 | static const struct of_device_id of_lm36274_leds_match[] = { | |
163 | { .compatible = "ti,lm36274-backlight", }, | |
164 | {}, | |
165 | }; | |
166 | MODULE_DEVICE_TABLE(of, of_lm36274_leds_match); | |
167 | ||
168 | static struct platform_driver lm36274_driver = { | |
169 | .probe = lm36274_probe, | |
a0972fff | 170 | .remove = lm36274_remove, |
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171 | .driver = { |
172 | .name = "lm36274-leds", | |
173 | }, | |
174 | }; | |
175 | module_platform_driver(lm36274_driver) | |
176 | ||
177 | MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver"); | |
178 | MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>"); | |
179 | MODULE_LICENSE("GPL v2"); |