diff options
Diffstat (limited to 'drivers/video/backlight/da9052_bl.c')
-rw-r--r-- | drivers/video/backlight/da9052_bl.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c new file mode 100644 index 000000000000..b628d68f5162 --- /dev/null +++ b/drivers/video/backlight/da9052_bl.c | |||
@@ -0,0 +1,187 @@ | |||
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"); | ||