diff options
Diffstat (limited to 'drivers/video/backlight/da903x.c')
-rw-r--r-- | drivers/video/backlight/da903x.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/video/backlight/da903x.c b/drivers/video/backlight/da903x.c new file mode 100644 index 000000000000..242c38250166 --- /dev/null +++ b/drivers/video/backlight/da903x.c | |||
@@ -0,0 +1,201 @@ | |||
1 | /* | ||
2 | * Backlight driver for Dialog Semiconductor DA9030/DA9034 | ||
3 | * | ||
4 | * Copyright (C) 2008 Compulab, Ltd. | ||
5 | * Mike Rapoport <mike@compulab.co.il> | ||
6 | * | ||
7 | * Copyright (C) 2006-2008 Marvell International Ltd. | ||
8 | * Eric Miao <eric.miao@marvell.com> | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or modify | ||
11 | * it under the terms of the GNU General Public License version 2 as | ||
12 | * published by the Free Software Foundation. | ||
13 | */ | ||
14 | |||
15 | #include <linux/kernel.h> | ||
16 | #include <linux/init.h> | ||
17 | #include <linux/platform_device.h> | ||
18 | #include <linux/fb.h> | ||
19 | #include <linux/backlight.h> | ||
20 | #include <linux/mfd/da903x.h> | ||
21 | |||
22 | #define DA9030_WLED_CONTROL 0x25 | ||
23 | #define DA9030_WLED_CP_EN (1 << 6) | ||
24 | #define DA9030_WLED_TRIM(x) ((x) & 0x7) | ||
25 | |||
26 | #define DA9034_WLED_CONTROL1 0x3C | ||
27 | #define DA9034_WLED_CONTROL2 0x3D | ||
28 | |||
29 | #define DA9034_WLED_BOOST_EN (1 << 5) | ||
30 | |||
31 | #define DA9030_MAX_BRIGHTNESS 7 | ||
32 | #define DA9034_MAX_BRIGHTNESS 0x7f | ||
33 | |||
34 | struct da903x_backlight_data { | ||
35 | struct device *da903x_dev; | ||
36 | int id; | ||
37 | int current_brightness; | ||
38 | }; | ||
39 | |||
40 | static int da903x_backlight_set(struct backlight_device *bl, int brightness) | ||
41 | { | ||
42 | struct da903x_backlight_data *data = bl_get_data(bl); | ||
43 | struct device *dev = data->da903x_dev; | ||
44 | uint8_t val; | ||
45 | int ret = 0; | ||
46 | |||
47 | switch (data->id) { | ||
48 | case DA9034_ID_WLED: | ||
49 | ret = da903x_update(dev, DA9034_WLED_CONTROL1, | ||
50 | brightness, 0x7f); | ||
51 | if (ret) | ||
52 | return ret; | ||
53 | |||
54 | if (data->current_brightness && brightness == 0) | ||
55 | ret = da903x_clr_bits(dev, | ||
56 | DA9034_WLED_CONTROL2, | ||
57 | DA9034_WLED_BOOST_EN); | ||
58 | |||
59 | if (data->current_brightness == 0 && brightness) | ||
60 | ret = da903x_set_bits(dev, | ||
61 | DA9034_WLED_CONTROL2, | ||
62 | DA9034_WLED_BOOST_EN); | ||
63 | break; | ||
64 | case DA9030_ID_WLED: | ||
65 | val = DA9030_WLED_TRIM(brightness); | ||
66 | val |= brightness ? DA9030_WLED_CP_EN : 0; | ||
67 | ret = da903x_write(dev, DA9030_WLED_CONTROL, val); | ||
68 | break; | ||
69 | } | ||
70 | |||
71 | if (ret) | ||
72 | return ret; | ||
73 | |||
74 | data->current_brightness = brightness; | ||
75 | return 0; | ||
76 | } | ||
77 | |||
78 | static int da903x_backlight_update_status(struct backlight_device *bl) | ||
79 | { | ||
80 | int brightness = bl->props.brightness; | ||
81 | |||
82 | if (bl->props.power != FB_BLANK_UNBLANK) | ||
83 | brightness = 0; | ||
84 | |||
85 | if (bl->props.fb_blank != FB_BLANK_UNBLANK) | ||
86 | brightness = 0; | ||
87 | |||
88 | return da903x_backlight_set(bl, brightness); | ||
89 | } | ||
90 | |||
91 | static int da903x_backlight_get_brightness(struct backlight_device *bl) | ||
92 | { | ||
93 | struct da903x_backlight_data *data = bl_get_data(bl); | ||
94 | return data->current_brightness; | ||
95 | } | ||
96 | |||
97 | static struct backlight_ops da903x_backlight_ops = { | ||
98 | .update_status = da903x_backlight_update_status, | ||
99 | .get_brightness = da903x_backlight_get_brightness, | ||
100 | }; | ||
101 | |||
102 | static int da903x_backlight_probe(struct platform_device *pdev) | ||
103 | { | ||
104 | struct da903x_backlight_data *data; | ||
105 | struct backlight_device *bl; | ||
106 | int max_brightness; | ||
107 | |||
108 | data = kzalloc(sizeof(*data), GFP_KERNEL); | ||
109 | if (data == NULL) | ||
110 | return -ENOMEM; | ||
111 | |||
112 | switch (pdev->id) { | ||
113 | case DA9030_ID_WLED: | ||
114 | max_brightness = DA9030_MAX_BRIGHTNESS; | ||
115 | break; | ||
116 | case DA9034_ID_WLED: | ||
117 | max_brightness = DA9034_MAX_BRIGHTNESS; | ||
118 | break; | ||
119 | default: | ||
120 | dev_err(&pdev->dev, "invalid backlight device ID(%d)\n", | ||
121 | pdev->id); | ||
122 | return -EINVAL; | ||
123 | } | ||
124 | |||
125 | data->id = pdev->id; | ||
126 | data->da903x_dev = pdev->dev.parent; | ||
127 | data->current_brightness = 0; | ||
128 | |||
129 | bl = backlight_device_register(pdev->name, data->da903x_dev, | ||
130 | data, &da903x_backlight_ops); | ||
131 | if (IS_ERR(bl)) { | ||
132 | dev_err(&pdev->dev, "failed to register backlight\n"); | ||
133 | return PTR_ERR(bl); | ||
134 | } | ||
135 | |||
136 | bl->props.max_brightness = max_brightness; | ||
137 | bl->props.brightness = max_brightness; | ||
138 | |||
139 | platform_set_drvdata(pdev, bl); | ||
140 | backlight_update_status(bl); | ||
141 | return 0; | ||
142 | } | ||
143 | |||
144 | static int da903x_backlight_remove(struct platform_device *pdev) | ||
145 | { | ||
146 | struct backlight_device *bl = platform_get_drvdata(pdev); | ||
147 | struct da903x_backlight_data *data = bl_get_data(bl); | ||
148 | |||
149 | backlight_device_unregister(bl); | ||
150 | kfree(data); | ||
151 | return 0; | ||
152 | } | ||
153 | |||
154 | #ifdef CONFIG_PM | ||
155 | static int da903x_backlight_suspend(struct platform_device *pdev, | ||
156 | pm_message_t state) | ||
157 | { | ||
158 | struct backlight_device *bl = platform_get_drvdata(pdev); | ||
159 | return da903x_backlight_set(bl, 0); | ||
160 | } | ||
161 | |||
162 | static int da903x_backlight_resume(struct platform_device *pdev) | ||
163 | { | ||
164 | struct backlight_device *bl = platform_get_drvdata(pdev); | ||
165 | |||
166 | backlight_update_status(bl); | ||
167 | return 0; | ||
168 | } | ||
169 | #else | ||
170 | #define da903x_backlight_suspend NULL | ||
171 | #define da903x_backlight_resume NULL | ||
172 | #endif | ||
173 | |||
174 | static struct platform_driver da903x_backlight_driver = { | ||
175 | .driver = { | ||
176 | .name = "da903x-backlight", | ||
177 | .owner = THIS_MODULE, | ||
178 | }, | ||
179 | .probe = da903x_backlight_probe, | ||
180 | .remove = da903x_backlight_remove, | ||
181 | .suspend = da903x_backlight_suspend, | ||
182 | .resume = da903x_backlight_resume, | ||
183 | }; | ||
184 | |||
185 | static int __init da903x_backlight_init(void) | ||
186 | { | ||
187 | return platform_driver_register(&da903x_backlight_driver); | ||
188 | } | ||
189 | module_init(da903x_backlight_init); | ||
190 | |||
191 | static void __exit da903x_backlight_exit(void) | ||
192 | { | ||
193 | platform_driver_unregister(&da903x_backlight_driver); | ||
194 | } | ||
195 | module_exit(da903x_backlight_exit); | ||
196 | |||
197 | MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034"); | ||
198 | MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>" | ||
199 | "Mike Rapoport <mike@compulab.co.il>"); | ||
200 | MODULE_LICENSE("GPL"); | ||
201 | MODULE_ALIAS("platform:da903x-backlight"); | ||