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3b96ea9e TR |
1 | /* |
2 | * linux/drivers/video/backlight/adx.c | |
3 | * | |
4 | * Copyright (C) 2009 Avionic Design GmbH | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Written by Thierry Reding <thierry.reding@avionic-design.de> | |
11 | */ | |
12 | ||
13 | #include <linux/backlight.h> | |
14 | #include <linux/fb.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/platform_device.h> | |
18 | ||
19 | /* register definitions */ | |
20 | #define ADX_BACKLIGHT_CONTROL 0x00 | |
21 | #define ADX_BACKLIGHT_CONTROL_ENABLE (1 << 0) | |
22 | #define ADX_BACKLIGHT_BRIGHTNESS 0x08 | |
23 | #define ADX_BACKLIGHT_STATUS 0x10 | |
24 | #define ADX_BACKLIGHT_ERROR 0x18 | |
25 | ||
26 | struct adxbl { | |
27 | void __iomem *base; | |
28 | }; | |
29 | ||
30 | static int adx_backlight_update_status(struct backlight_device *bldev) | |
31 | { | |
32 | struct adxbl *bl = bl_get_data(bldev); | |
33 | u32 value; | |
34 | ||
35 | value = bldev->props.brightness; | |
36 | writel(value, bl->base + ADX_BACKLIGHT_BRIGHTNESS); | |
37 | ||
38 | value = readl(bl->base + ADX_BACKLIGHT_CONTROL); | |
39 | ||
40 | if (bldev->props.state & BL_CORE_FBBLANK) | |
41 | value &= ~ADX_BACKLIGHT_CONTROL_ENABLE; | |
42 | else | |
43 | value |= ADX_BACKLIGHT_CONTROL_ENABLE; | |
44 | ||
45 | writel(value, bl->base + ADX_BACKLIGHT_CONTROL); | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
50 | static int adx_backlight_get_brightness(struct backlight_device *bldev) | |
51 | { | |
52 | struct adxbl *bl = bl_get_data(bldev); | |
53 | u32 brightness; | |
54 | ||
55 | brightness = readl(bl->base + ADX_BACKLIGHT_BRIGHTNESS); | |
56 | return brightness & 0xff; | |
57 | } | |
58 | ||
57e148b6 | 59 | static int adx_backlight_check_fb(struct backlight_device *bldev, struct fb_info *fb) |
3b96ea9e TR |
60 | { |
61 | return 1; | |
62 | } | |
63 | ||
9905a43b | 64 | static const struct backlight_ops adx_backlight_ops = { |
3b96ea9e TR |
65 | .options = 0, |
66 | .update_status = adx_backlight_update_status, | |
67 | .get_brightness = adx_backlight_get_brightness, | |
68 | .check_fb = adx_backlight_check_fb, | |
69 | }; | |
70 | ||
71 | static int __devinit adx_backlight_probe(struct platform_device *pdev) | |
72 | { | |
73 | struct backlight_device *bldev; | |
74 | struct resource *res; | |
75 | struct adxbl *bl; | |
76 | int ret = 0; | |
77 | ||
78 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
79 | if (!res) { | |
80 | ret = -ENXIO; | |
81 | goto out; | |
82 | } | |
83 | ||
84 | res = devm_request_mem_region(&pdev->dev, res->start, | |
85 | resource_size(res), res->name); | |
86 | if (!res) { | |
87 | ret = -ENXIO; | |
88 | goto out; | |
89 | } | |
90 | ||
91 | bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL); | |
92 | if (!bl) { | |
93 | ret = -ENOMEM; | |
94 | goto out; | |
95 | } | |
96 | ||
97 | bl->base = devm_ioremap_nocache(&pdev->dev, res->start, | |
98 | resource_size(res)); | |
99 | if (!bl->base) { | |
100 | ret = -ENXIO; | |
101 | goto out; | |
102 | } | |
103 | ||
104 | bldev = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, bl, | |
105 | &adx_backlight_ops); | |
106 | if (!bldev) { | |
107 | ret = -ENOMEM; | |
108 | goto out; | |
109 | } | |
110 | ||
111 | bldev->props.max_brightness = 0xff; | |
112 | bldev->props.brightness = 0xff; | |
113 | bldev->props.power = FB_BLANK_UNBLANK; | |
114 | ||
115 | platform_set_drvdata(pdev, bldev); | |
116 | ||
117 | out: | |
118 | return ret; | |
119 | } | |
120 | ||
121 | static int __devexit adx_backlight_remove(struct platform_device *pdev) | |
122 | { | |
123 | struct backlight_device *bldev; | |
124 | int ret = 0; | |
125 | ||
126 | bldev = platform_get_drvdata(pdev); | |
127 | bldev->props.power = FB_BLANK_UNBLANK; | |
128 | bldev->props.brightness = 0xff; | |
129 | backlight_update_status(bldev); | |
130 | backlight_device_unregister(bldev); | |
131 | platform_set_drvdata(pdev, NULL); | |
132 | ||
133 | return ret; | |
134 | } | |
135 | ||
136 | #ifdef CONFIG_PM | |
137 | static int adx_backlight_suspend(struct platform_device *pdev, | |
138 | pm_message_t state) | |
139 | { | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int adx_backlight_resume(struct platform_device *pdev) | |
144 | { | |
145 | return 0; | |
146 | } | |
147 | #else | |
148 | #define adx_backlight_suspend NULL | |
149 | #define adx_backlight_resume NULL | |
150 | #endif | |
151 | ||
152 | static struct platform_driver adx_backlight_driver = { | |
153 | .probe = adx_backlight_probe, | |
154 | .remove = __devexit_p(adx_backlight_remove), | |
155 | .suspend = adx_backlight_suspend, | |
156 | .resume = adx_backlight_resume, | |
157 | .driver = { | |
158 | .name = "adx-backlight", | |
159 | .owner = THIS_MODULE, | |
160 | }, | |
161 | }; | |
162 | ||
163 | static int __init adx_backlight_init(void) | |
164 | { | |
165 | return platform_driver_register(&adx_backlight_driver); | |
166 | } | |
167 | ||
168 | static void __exit adx_backlight_exit(void) | |
169 | { | |
170 | platform_driver_unregister(&adx_backlight_driver); | |
171 | } | |
172 | ||
173 | module_init(adx_backlight_init); | |
174 | module_exit(adx_backlight_exit); | |
175 | ||
176 | MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); | |
177 | MODULE_DESCRIPTION("Avionic Design Xanthos Backlight Driver"); | |
178 | MODULE_LICENSE("GPL v2"); |