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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> | |
19 | #include <linux/workqueue.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #include <linux/mfd/da9052/reg.h> | |
23 | #include <linux/mfd/da9052/da9052.h> | |
24 | #include <linux/mfd/da9052/pdata.h> | |
25 | ||
26 | #define DA9052_OPENDRAIN_OUTPUT 2 | |
27 | #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3) | |
28 | #define DA9052_MASK_UPPER_NIBBLE 0xF0 | |
29 | #define DA9052_MASK_LOWER_NIBBLE 0x0F | |
30 | #define DA9052_NIBBLE_SHIFT 4 | |
31 | #define DA9052_MAX_BRIGHTNESS 0x5f | |
32 | ||
33 | struct da9052_led { | |
34 | struct led_classdev cdev; | |
35 | struct work_struct work; | |
36 | struct da9052 *da9052; | |
37 | unsigned char led_index; | |
38 | unsigned char id; | |
39 | int brightness; | |
40 | }; | |
41 | ||
42 | static unsigned char led_reg[] = { | |
43 | DA9052_LED_CONT_4_REG, | |
44 | DA9052_LED_CONT_5_REG, | |
45 | }; | |
46 | ||
47 | static int da9052_set_led_brightness(struct da9052_led *led) | |
48 | { | |
49 | u8 val; | |
50 | int error; | |
51 | ||
52 | val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM; | |
53 | ||
54 | error = da9052_reg_write(led->da9052, led_reg[led->led_index], val); | |
55 | if (error < 0) | |
56 | dev_err(led->da9052->dev, "Failed to set led brightness, %d\n", | |
57 | error); | |
58 | return error; | |
59 | } | |
60 | ||
61 | static void da9052_led_work(struct work_struct *work) | |
62 | { | |
63 | struct da9052_led *led = container_of(work, struct da9052_led, work); | |
64 | ||
65 | da9052_set_led_brightness(led); | |
66 | } | |
67 | ||
68 | static void da9052_led_set(struct led_classdev *led_cdev, | |
69 | enum led_brightness value) | |
70 | { | |
71 | struct da9052_led *led; | |
72 | ||
73 | led = container_of(led_cdev, struct da9052_led, cdev); | |
74 | led->brightness = value; | |
75 | schedule_work(&led->work); | |
76 | } | |
77 | ||
78 | static int da9052_configure_leds(struct da9052 *da9052) | |
79 | { | |
80 | int error; | |
81 | unsigned char register_value = DA9052_OPENDRAIN_OUTPUT | |
82 | | DA9052_SET_HIGH_LVL_OUTPUT; | |
83 | ||
84 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, | |
85 | DA9052_MASK_LOWER_NIBBLE, | |
86 | register_value); | |
87 | ||
88 | if (error < 0) { | |
89 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", | |
90 | error); | |
91 | return error; | |
92 | } | |
93 | ||
94 | error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG, | |
95 | DA9052_MASK_UPPER_NIBBLE, | |
96 | register_value << DA9052_NIBBLE_SHIFT); | |
97 | if (error < 0) | |
98 | dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n", | |
99 | error); | |
100 | ||
101 | return error; | |
102 | } | |
103 | ||
98ea1ea2 | 104 | static int da9052_led_probe(struct platform_device *pdev) |
5ba73631 DDC |
105 | { |
106 | struct da9052_pdata *pdata; | |
107 | struct da9052 *da9052; | |
108 | struct led_platform_data *pled; | |
109 | struct da9052_led *led = NULL; | |
110 | int error = -ENODEV; | |
111 | int i; | |
112 | ||
113 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 114 | pdata = dev_get_platdata(da9052->dev); |
5ba73631 DDC |
115 | if (pdata == NULL) { |
116 | dev_err(&pdev->dev, "No platform data\n"); | |
117 | goto err; | |
118 | } | |
119 | ||
120 | pled = pdata->pled; | |
121 | if (pled == NULL) { | |
122 | dev_err(&pdev->dev, "No platform data for LED\n"); | |
123 | goto err; | |
124 | } | |
125 | ||
126 | led = devm_kzalloc(&pdev->dev, | |
127 | sizeof(struct da9052_led) * pled->num_leds, | |
128 | GFP_KERNEL); | |
129 | if (led == NULL) { | |
130 | dev_err(&pdev->dev, "Failed to alloc memory\n"); | |
131 | error = -ENOMEM; | |
132 | goto err; | |
133 | } | |
134 | ||
135 | for (i = 0; i < pled->num_leds; i++) { | |
136 | led[i].cdev.name = pled->leds[i].name; | |
137 | led[i].cdev.brightness_set = da9052_led_set; | |
138 | led[i].cdev.brightness = LED_OFF; | |
139 | led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS; | |
140 | led[i].brightness = LED_OFF; | |
141 | led[i].led_index = pled->leds[i].flags; | |
142 | led[i].da9052 = dev_get_drvdata(pdev->dev.parent); | |
143 | INIT_WORK(&led[i].work, da9052_led_work); | |
144 | ||
145 | error = led_classdev_register(pdev->dev.parent, &led[i].cdev); | |
146 | if (error) { | |
147 | dev_err(&pdev->dev, "Failed to register led %d\n", | |
148 | led[i].led_index); | |
149 | goto err_register; | |
150 | } | |
151 | ||
152 | error = da9052_set_led_brightness(&led[i]); | |
153 | if (error) { | |
154 | dev_err(&pdev->dev, "Unable to init led %d\n", | |
155 | led[i].led_index); | |
156 | continue; | |
157 | } | |
158 | } | |
159 | error = da9052_configure_leds(led->da9052); | |
160 | if (error) { | |
161 | dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error); | |
162 | goto err_register; | |
163 | } | |
164 | ||
165 | platform_set_drvdata(pdev, led); | |
166 | ||
167 | return 0; | |
168 | ||
169 | err_register: | |
170 | for (i = i - 1; i >= 0; i--) { | |
171 | led_classdev_unregister(&led[i].cdev); | |
172 | cancel_work_sync(&led[i].work); | |
173 | } | |
174 | err: | |
175 | return error; | |
176 | } | |
177 | ||
678e8a6b | 178 | static int da9052_led_remove(struct platform_device *pdev) |
5ba73631 DDC |
179 | { |
180 | struct da9052_led *led = platform_get_drvdata(pdev); | |
181 | struct da9052_pdata *pdata; | |
182 | struct da9052 *da9052; | |
183 | struct led_platform_data *pled; | |
184 | int i; | |
185 | ||
186 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
87aae1ea | 187 | pdata = dev_get_platdata(da9052->dev); |
5ba73631 DDC |
188 | pled = pdata->pled; |
189 | ||
190 | for (i = 0; i < pled->num_leds; i++) { | |
191 | led[i].brightness = 0; | |
192 | da9052_set_led_brightness(&led[i]); | |
193 | led_classdev_unregister(&led[i].cdev); | |
194 | cancel_work_sync(&led[i].work); | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static struct platform_driver da9052_led_driver = { | |
201 | .driver = { | |
202 | .name = "da9052-leds", | |
203 | .owner = THIS_MODULE, | |
204 | }, | |
205 | .probe = da9052_led_probe, | |
df07cf81 | 206 | .remove = da9052_led_remove, |
5ba73631 DDC |
207 | }; |
208 | ||
209 | module_platform_driver(da9052_led_driver); | |
210 | ||
211 | MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>"); | |
212 | MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC"); | |
213 | MODULE_LICENSE("GPL"); |