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1 | /* |
2 | * Backlight 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 | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/backlight.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/fb.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
21 | #include <linux/mfd/da9052/da9052.h> | |
22 | #include <linux/mfd/da9052/reg.h> | |
23 | ||
24 | #define DA9052_MAX_BRIGHTNESS 0xFF | |
25 | ||
26 | enum { | |
27 | DA9052_WLEDS_OFF, | |
28 | DA9052_WLEDS_ON, | |
29 | }; | |
30 | ||
31 | enum { | |
32 | DA9052_TYPE_WLED1, | |
33 | DA9052_TYPE_WLED2, | |
34 | DA9052_TYPE_WLED3, | |
35 | }; | |
36 | ||
37 | static unsigned char wled_bank[] = { | |
38 | DA9052_LED1_CONF_REG, | |
39 | DA9052_LED2_CONF_REG, | |
40 | DA9052_LED3_CONF_REG, | |
41 | }; | |
42 | ||
43 | struct da9052_bl { | |
44 | struct da9052 *da9052; | |
45 | uint brightness; | |
46 | uint state; | |
47 | uint led_reg; | |
48 | }; | |
49 | ||
50 | static int da9052_adjust_wled_brightness(struct da9052_bl *wleds) | |
51 | { | |
52 | unsigned char boost_en; | |
53 | unsigned char i_sink; | |
54 | int ret; | |
55 | ||
56 | boost_en = 0x3F; | |
57 | i_sink = 0xFF; | |
58 | if (wleds->state == DA9052_WLEDS_OFF) { | |
59 | boost_en = 0x00; | |
60 | i_sink = 0x00; | |
61 | } | |
62 | ||
63 | ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en); | |
64 | if (ret < 0) | |
65 | return ret; | |
66 | ||
67 | ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink); | |
68 | if (ret < 0) | |
69 | return ret; | |
70 | ||
71 | ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0); | |
72 | if (ret < 0) | |
73 | return ret; | |
74 | ||
75 | msleep(10); | |
76 | ||
77 | if (wleds->brightness) { | |
78 | ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], | |
79 | wleds->brightness); | |
80 | if (ret < 0) | |
81 | return ret; | |
82 | } | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static int da9052_backlight_update_status(struct backlight_device *bl) | |
88 | { | |
89 | int brightness = bl->props.brightness; | |
90 | struct da9052_bl *wleds = bl_get_data(bl); | |
91 | ||
92 | wleds->brightness = brightness; | |
93 | wleds->state = DA9052_WLEDS_ON; | |
94 | ||
95 | return da9052_adjust_wled_brightness(wleds); | |
96 | } | |
97 | ||
98 | static int da9052_backlight_get_brightness(struct backlight_device *bl) | |
99 | { | |
100 | struct da9052_bl *wleds = bl_get_data(bl); | |
101 | ||
102 | return wleds->brightness; | |
103 | } | |
104 | ||
105 | static const struct backlight_ops da9052_backlight_ops = { | |
106 | .update_status = da9052_backlight_update_status, | |
107 | .get_brightness = da9052_backlight_get_brightness, | |
108 | }; | |
109 | ||
110 | static int da9052_backlight_probe(struct platform_device *pdev) | |
111 | { | |
112 | struct backlight_device *bl; | |
113 | struct backlight_properties props; | |
114 | struct da9052_bl *wleds; | |
115 | ||
116 | wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL); | |
117 | if (!wleds) | |
118 | return -ENOMEM; | |
119 | ||
120 | wleds->da9052 = dev_get_drvdata(pdev->dev.parent); | |
121 | wleds->brightness = 0; | |
122 | wleds->led_reg = platform_get_device_id(pdev)->driver_data; | |
123 | wleds->state = DA9052_WLEDS_OFF; | |
124 | ||
125 | props.type = BACKLIGHT_RAW; | |
126 | props.max_brightness = DA9052_MAX_BRIGHTNESS; | |
127 | ||
128 | bl = backlight_device_register(pdev->name, wleds->da9052->dev, wleds, | |
129 | &da9052_backlight_ops, &props); | |
130 | if (IS_ERR(bl)) { | |
131 | dev_err(&pdev->dev, "Failed to register backlight\n"); | |
132 | devm_kfree(&pdev->dev, wleds); | |
133 | return PTR_ERR(bl); | |
134 | } | |
135 | ||
136 | bl->props.max_brightness = DA9052_MAX_BRIGHTNESS; | |
137 | bl->props.brightness = 0; | |
138 | platform_set_drvdata(pdev, bl); | |
139 | ||
140 | return da9052_adjust_wled_brightness(wleds); | |
141 | } | |
142 | ||
143 | static int da9052_backlight_remove(struct platform_device *pdev) | |
144 | { | |
145 | struct backlight_device *bl = platform_get_drvdata(pdev); | |
146 | struct da9052_bl *wleds = bl_get_data(bl); | |
147 | ||
148 | wleds->brightness = 0; | |
149 | wleds->state = DA9052_WLEDS_OFF; | |
150 | da9052_adjust_wled_brightness(wleds); | |
151 | backlight_device_unregister(bl); | |
152 | devm_kfree(&pdev->dev, wleds); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static struct platform_device_id da9052_wled_ids[] = { | |
158 | { | |
159 | .name = "da9052-wled1", | |
160 | .driver_data = DA9052_TYPE_WLED1, | |
161 | }, | |
162 | { | |
163 | .name = "da9052-wled2", | |
164 | .driver_data = DA9052_TYPE_WLED2, | |
165 | }, | |
166 | { | |
167 | .name = "da9052-wled3", | |
168 | .driver_data = DA9052_TYPE_WLED3, | |
169 | }, | |
170 | }; | |
171 | ||
172 | static struct platform_driver da9052_wled_driver = { | |
173 | .probe = da9052_backlight_probe, | |
174 | .remove = da9052_backlight_remove, | |
175 | .id_table = da9052_wled_ids, | |
176 | .driver = { | |
177 | .name = "da9052-wled", | |
178 | .owner = THIS_MODULE, | |
179 | }, | |
180 | }; | |
181 | ||
182 | module_platform_driver(da9052_wled_driver); | |
183 | ||
184 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); | |
185 | MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC"); | |
186 | MODULE_LICENSE("GPL"); | |
187 | MODULE_ALIAS("platform:da9052-backlight"); |