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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
5ba73631 DDC |
2 | /* |
3 | * LED Driver for Dialog DA9052 PMICs. | |
4 | * | |
5 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
6 | * | |
7 | * Author: David Dajun Chen <dchen@diasemi.com> | |
5ba73631 DDC |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
5ba73631 DDC |
12 | #include <linux/platform_device.h> |
13 | #include <linux/leds.h> | |
5ba73631 DDC |
14 | #include <linux/slab.h> |
15 | ||
16 | #include <linux/mfd/da9052/reg.h> | |
17 | #include <linux/mfd/da9052/da9052.h> | |
18 | #include <linux/mfd/da9052/pdata.h> | |
19 | ||
20 | #define DA9052_OPENDRAIN_OUTPUT 2 | |
21 | #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) | |
22 | #define DA9052_MASK_UPPER_NIBBLE 0xF0 | |
23 | #define DA9052_MASK_LOWER_NIBBLE 0x0F | |
24 | #define DA9052_NIBBLE_SHIFT 4 | |
25 | #define DA9052_MAX_BRIGHTNESS 0x5f | |
26 | ||
27 | struct da9052_led { | |
28 | struct led_classdev cdev; | |
5ba73631 DDC |
29 | struct da9052 *da9052; |
30 | unsigned char led_index; | |
31 | unsigned char id; | |
5ba73631 DDC |
32 | }; |
33 | ||
34 | static unsigned char led_reg[] = { | |
35 | DA9052_LED_CONT_4_REG, | |
36 | DA9052_LED_CONT_5_REG, | |
37 | }; | |
38 | ||
0a1f01d3 AL |
39 | static int da9052_set_led_brightness(struct da9052_led *led, |
40 | enum led_brightness brightness) | |
5ba73631 DDC |
41 | { |
42 | u8 val; | |
43 | int error; | |
44 | ||
0a1f01d3 | 45 | val = (brightness & 0x7f) | DA9052_LED_CONT_DIM; |
5ba73631 DDC |
46 | |
47 | error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); | |
48 | if (error < 0) | |
49 | dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", | |
50 | error); | |
51 | return error; | |
52 | } | |
53 | ||
0a1f01d3 | 54 | static int da9052_led_set(struct led_classdev *led_cdev, |
5ba73631 DDC |
55 | enum led_brightness value) |
56 | { | |
0a1f01d3 AL |
57 | struct da9052_led *led = |
58 | container_of(led_cdev, struct da9052_led, cdev); | |
5ba73631 | 59 | |
0a1f01d3 | 60 | return da9052_set_led_brightness(led, value); |
5ba73631 DDC |
61 | } |
62 | ||
63 | static int da9052_configure_leds(struct da9052 *da9052) | |
64 | { | |
65 | int error; | |
66 | unsigned char register_value = DA9052_OPENDRAIN_OUTPUT | |
67 | | DA9052_SET_HIGH_LVL_OUTPUT; | |
68 | ||
69 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, | |
70 | DA9052_MASK_LOWER_NIBBLE, | |
71 | register_value); | |
72 | ||
73 | if (error < 0) { | |
74 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", | |
75 | error); | |
76 | return error; | |
77 | } | |
78 | ||
79 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, | |
80 | DA9052_MASK_UPPER_NIBBLE, | |
81 | register_value << DA9052_NIBBLE_SHIFT); | |
82 | if (error < 0) | |
83 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", | |
84 | error); | |
85 | ||
86 | return error; | |
87 | } | |
88 | ||
98ea1ea2 | 89 | static int da9052_led_probe(struct platform_device *pdev) |
5ba73631 DDC |
90 | { |
91 | struct da9052_pdata *pdata; | |
92 | struct da9052 *da9052; | |
93 | struct led_platform_data *pled; | |
94 | struct da9052_led *led = NULL; | |
95 | int error = -ENODEV; | |
96 | int i; | |
97 | ||
98 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 99 | pdata = dev_get_platdata(da9052->dev); |
5ba73631 DDC |
100 | if (pdata == NULL) { |
101 | dev_err(&pdev->dev, "No platform data\n"); | |
102 | goto err; | |
103 | } | |
104 | ||
105 | pled = pdata->pled; | |
106 | if (pled == NULL) { | |
107 | dev_err(&pdev->dev, "No platform data for LED\n"); | |
108 | goto err; | |
109 | } | |
110 | ||
a86854d0 KC |
111 | led = devm_kcalloc(&pdev->dev, |
112 | pled->num_leds, sizeof(struct da9052_led), | |
5ba73631 | 113 | GFP_KERNEL); |
0c9a03b6 | 114 | if (!led) { |
5ba73631 DDC |
115 | error = -ENOMEM; |
116 | goto err; | |
117 | } | |
118 | ||
119 | for (i = 0; i < pled->num_leds; i++) { | |
120 | led[i].cdev.name = pled->leds[i].name; | |
0a1f01d3 | 121 | led[i].cdev.brightness_set_blocking = da9052_led_set; |
5ba73631 DDC |
122 | led[i].cdev.brightness = LED_OFF; |
123 | led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; | |
5ba73631 DDC |
124 | led[i].led_index = pled->leds[i].flags; |
125 | led[i].da9052 = dev_get_drvdata(pdev->dev.parent); | |
5ba73631 DDC |
126 | |
127 | error = led_classdev_register(pdev->dev.parent, &led[i].cdev); | |
128 | if (error) { | |
129 | dev_err(&pdev->dev, "Failed to register led %d\n", | |
130 | led[i].led_index); | |
131 | goto err_register; | |
132 | } | |
133 | ||
0a1f01d3 AL |
134 | error = da9052_set_led_brightness(&led[i], |
135 | led[i].cdev.brightness); | |
5ba73631 DDC |
136 | if (error) { |
137 | dev_err(&pdev->dev, "Unable to init led %d\n", | |
138 | led[i].led_index); | |
139 | continue; | |
140 | } | |
141 | } | |
142 | error = da9052_configure_leds(led->da9052); | |
143 | if (error) { | |
144 | dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); | |
145 | goto err_register; | |
146 | } | |
147 | ||
148 | platform_set_drvdata(pdev, led); | |
149 | ||
150 | return 0; | |
151 | ||
152 | err_register: | |
0a1f01d3 | 153 | for (i = i - 1; i >= 0; i--) |
5ba73631 | 154 | led_classdev_unregister(&led[i].cdev); |
5ba73631 DDC |
155 | err: |
156 | return error; | |
157 | } | |
158 | ||
60613020 | 159 | static void da9052_led_remove(struct platform_device *pdev) |
5ba73631 DDC |
160 | { |
161 | struct da9052_led *led = platform_get_drvdata(pdev); | |
162 | struct da9052_pdata *pdata; | |
163 | struct da9052 *da9052; | |
164 | struct led_platform_data *pled; | |
165 | int i; | |
166 | ||
167 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 168 | pdata = dev_get_platdata(da9052->dev); |
5ba73631 DDC |
169 | pled = pdata->pled; |
170 | ||
171 | for (i = 0; i < pled->num_leds; i++) { | |
0a1f01d3 | 172 | da9052_set_led_brightness(&led[i], LED_OFF); |
5ba73631 | 173 | led_classdev_unregister(&led[i].cdev); |
5ba73631 | 174 | } |
5ba73631 DDC |
175 | } |
176 | ||
177 | static struct platform_driver da9052_led_driver = { | |
178 | .driver = { | |
179 | .name = "da9052-leds", | |
5ba73631 DDC |
180 | }, |
181 | .probe = da9052_led_probe, | |
60613020 | 182 | .remove_new = da9052_led_remove, |
5ba73631 DDC |
183 | }; |
184 | ||
185 | module_platform_driver(da9052_led_driver); | |
186 | ||
187 | MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); | |
188 | MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); | |
189 | MODULE_LICENSE("GPL"); |