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5ba73631 DDC |
1 | /* |
2 | * LED Driver for Dialog DA9052 PMICs. | |
3 | * | |
4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
5 | * | |
6 | * Author: David Dajun Chen <dchen@diasemi.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/kernel.h> | |
5ba73631 DDC |
17 | #include <linux/platform_device.h> |
18 | #include <linux/leds.h> | |
5ba73631 DDC |
19 | #include <linux/slab.h> |
20 | ||
21 | #include <linux/mfd/da9052/reg.h> | |
22 | #include <linux/mfd/da9052/da9052.h> | |
23 | #include <linux/mfd/da9052/pdata.h> | |
24 | ||
25 | #define DA9052_OPENDRAIN_OUTPUT 2 | |
26 | #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) | |
27 | #define DA9052_MASK_UPPER_NIBBLE 0xF0 | |
28 | #define DA9052_MASK_LOWER_NIBBLE 0x0F | |
29 | #define DA9052_NIBBLE_SHIFT 4 | |
30 | #define DA9052_MAX_BRIGHTNESS 0x5f | |
31 | ||
32 | struct da9052_led { | |
33 | struct led_classdev cdev; | |
5ba73631 DDC |
34 | struct da9052 *da9052; |
35 | unsigned char led_index; | |
36 | unsigned char id; | |
5ba73631 DDC |
37 | }; |
38 | ||
39 | static unsigned char led_reg[] = { | |
40 | DA9052_LED_CONT_4_REG, | |
41 | DA9052_LED_CONT_5_REG, | |
42 | }; | |
43 | ||
0a1f01d3 AL |
44 | static int da9052_set_led_brightness(struct da9052_led *led, |
45 | enum led_brightness brightness) | |
5ba73631 DDC |
46 | { |
47 | u8 val; | |
48 | int error; | |
49 | ||
0a1f01d3 | 50 | val = (brightness & 0x7f) | DA9052_LED_CONT_DIM; |
5ba73631 DDC |
51 | |
52 | error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); | |
53 | if (error < 0) | |
54 | dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", | |
55 | error); | |
56 | return error; | |
57 | } | |
58 | ||
0a1f01d3 | 59 | static int da9052_led_set(struct led_classdev *led_cdev, |
5ba73631 DDC |
60 | enum led_brightness value) |
61 | { | |
0a1f01d3 AL |
62 | struct da9052_led *led = |
63 | container_of(led_cdev, struct da9052_led, cdev); | |
5ba73631 | 64 | |
0a1f01d3 | 65 | return da9052_set_led_brightness(led, value); |
5ba73631 DDC |
66 | } |
67 | ||
68 | static int da9052_configure_leds(struct da9052 *da9052) | |
69 | { | |
70 | int error; | |
71 | unsigned char register_value = DA9052_OPENDRAIN_OUTPUT | |
72 | | DA9052_SET_HIGH_LVL_OUTPUT; | |
73 | ||
74 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, | |
75 | DA9052_MASK_LOWER_NIBBLE, | |
76 | register_value); | |
77 | ||
78 | if (error < 0) { | |
79 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", | |
80 | error); | |
81 | return error; | |
82 | } | |
83 | ||
84 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, | |
85 | DA9052_MASK_UPPER_NIBBLE, | |
86 | register_value << DA9052_NIBBLE_SHIFT); | |
87 | if (error < 0) | |
88 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", | |
89 | error); | |
90 | ||
91 | return error; | |
92 | } | |
93 | ||
98ea1ea2 | 94 | static int da9052_led_probe(struct platform_device *pdev) |
5ba73631 DDC |
95 | { |
96 | struct da9052_pdata *pdata; | |
97 | struct da9052 *da9052; | |
98 | struct led_platform_data *pled; | |
99 | struct da9052_led *led = NULL; | |
100 | int error = -ENODEV; | |
101 | int i; | |
102 | ||
103 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 104 | pdata = dev_get_platdata(da9052->dev); |
5ba73631 DDC |
105 | if (pdata == NULL) { |
106 | dev_err(&pdev->dev, "No platform data\n"); | |
107 | goto err; | |
108 | } | |
109 | ||
110 | pled = pdata->pled; | |
111 | if (pled == NULL) { | |
112 | dev_err(&pdev->dev, "No platform data for LED\n"); | |
113 | goto err; | |
114 | } | |
115 | ||
116 | led = devm_kzalloc(&pdev->dev, | |
117 | sizeof(struct da9052_led) * pled->num_leds, | |
118 | GFP_KERNEL); | |
0c9a03b6 | 119 | if (!led) { |
5ba73631 DDC |
120 | error = -ENOMEM; |
121 | goto err; | |
122 | } | |
123 | ||
124 | for (i = 0; i < pled->num_leds; i++) { | |
125 | led[i].cdev.name = pled->leds[i].name; | |
0a1f01d3 | 126 | led[i].cdev.brightness_set_blocking = da9052_led_set; |
5ba73631 DDC |
127 | led[i].cdev.brightness = LED_OFF; |
128 | led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; | |
5ba73631 DDC |
129 | led[i].led_index = pled->leds[i].flags; |
130 | led[i].da9052 = dev_get_drvdata(pdev->dev.parent); | |
5ba73631 DDC |
131 | |
132 | error = led_classdev_register(pdev->dev.parent, &led[i].cdev); | |
133 | if (error) { | |
134 | dev_err(&pdev->dev, "Failed to register led %d\n", | |
135 | led[i].led_index); | |
136 | goto err_register; | |
137 | } | |
138 | ||
0a1f01d3 AL |
139 | error = da9052_set_led_brightness(&led[i], |
140 | led[i].cdev.brightness); | |
5ba73631 DDC |
141 | if (error) { |
142 | dev_err(&pdev->dev, "Unable to init led %d\n", | |
143 | led[i].led_index); | |
144 | continue; | |
145 | } | |
146 | } | |
147 | error = da9052_configure_leds(led->da9052); | |
148 | if (error) { | |
149 | dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); | |
150 | goto err_register; | |
151 | } | |
152 | ||
153 | platform_set_drvdata(pdev, led); | |
154 | ||
155 | return 0; | |
156 | ||
157 | err_register: | |
0a1f01d3 | 158 | for (i = i - 1; i >= 0; i--) |
5ba73631 | 159 | led_classdev_unregister(&led[i].cdev); |
5ba73631 DDC |
160 | err: |
161 | return error; | |
162 | } | |
163 | ||
678e8a6b | 164 | static int da9052_led_remove(struct platform_device *pdev) |
5ba73631 DDC |
165 | { |
166 | struct da9052_led *led = platform_get_drvdata(pdev); | |
167 | struct da9052_pdata *pdata; | |
168 | struct da9052 *da9052; | |
169 | struct led_platform_data *pled; | |
170 | int i; | |
171 | ||
172 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 173 | pdata = dev_get_platdata(da9052->dev); |
5ba73631 DDC |
174 | pled = pdata->pled; |
175 | ||
176 | for (i = 0; i < pled->num_leds; i++) { | |
0a1f01d3 | 177 | da9052_set_led_brightness(&led[i], LED_OFF); |
5ba73631 | 178 | led_classdev_unregister(&led[i].cdev); |
5ba73631 DDC |
179 | } |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static struct platform_driver da9052_led_driver = { | |
185 | .driver = { | |
186 | .name = "da9052-leds", | |
5ba73631 DDC |
187 | }, |
188 | .probe = da9052_led_probe, | |
df07cf81 | 189 | .remove = da9052_led_remove, |
5ba73631 DDC |
190 | }; |
191 | ||
192 | module_platform_driver(da9052_led_driver); | |
193 | ||
194 | MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); | |
195 | MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); | |
196 | MODULE_LICENSE("GPL"); |