Merge branches 'boards' and 'fixes' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / drivers / video / backlight / platform_lcd.c
1 /* drivers/video/backlight/platform_lcd.c
2  *
3  * Copyright 2008 Simtec Electronics
4  *      Ben Dooks <ben@simtec.co.uk>
5  *
6  * Generic platform-device LCD power control interface.
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 version 2 as
10  * published by the Free Software Foundation.
11  *
12 */
13
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/fb.h>
17 #include <linux/backlight.h>
18 #include <linux/lcd.h>
19
20 #include <video/platform_lcd.h>
21
22 struct platform_lcd {
23         struct device           *us;
24         struct lcd_device       *lcd;
25         struct plat_lcd_data    *pdata;
26
27         unsigned int             power;
28         unsigned int             suspended : 1;
29 };
30
31 static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
32 {
33         return lcd_get_data(lcd);
34 }
35
36 static int platform_lcd_get_power(struct lcd_device *lcd)
37 {
38         struct platform_lcd *plcd = to_our_lcd(lcd);
39
40         return plcd->power;
41 }
42
43 static int platform_lcd_set_power(struct lcd_device *lcd, int power)
44 {
45         struct platform_lcd *plcd = to_our_lcd(lcd);
46         int lcd_power = 1;
47
48         if (power == FB_BLANK_POWERDOWN || plcd->suspended)
49                 lcd_power = 0;
50
51         plcd->pdata->set_power(plcd->pdata, lcd_power);
52         plcd->power = power;
53
54         return 0;
55 }
56
57 static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
58 {
59         struct platform_lcd *plcd = to_our_lcd(lcd);
60         struct plat_lcd_data *pdata = plcd->pdata;
61
62         if (pdata->match_fb)
63                 return pdata->match_fb(pdata, info);
64
65         return plcd->us->parent == info->device;
66 }
67
68 static struct lcd_ops platform_lcd_ops = {
69         .get_power      = platform_lcd_get_power,
70         .set_power      = platform_lcd_set_power,
71         .check_fb       = platform_lcd_match,
72 };
73
74 static int __devinit platform_lcd_probe(struct platform_device *pdev)
75 {
76         struct plat_lcd_data *pdata;
77         struct platform_lcd *plcd;
78         struct device *dev = &pdev->dev;
79         int err;
80
81         pdata = pdev->dev.platform_data;
82         if (!pdata) {
83                 dev_err(dev, "no platform data supplied\n");
84                 return -EINVAL;
85         }
86
87         plcd = kzalloc(sizeof(struct platform_lcd), GFP_KERNEL);
88         if (!plcd) {
89                 dev_err(dev, "no memory for state\n");
90                 return -ENOMEM;
91         }
92
93         plcd->us = dev;
94         plcd->pdata = pdata;
95         plcd->lcd = lcd_device_register(dev_name(dev), dev,
96                                         plcd, &platform_lcd_ops);
97         if (IS_ERR(plcd->lcd)) {
98                 dev_err(dev, "cannot register lcd device\n");
99                 err = PTR_ERR(plcd->lcd);
100                 goto err_mem;
101         }
102
103         platform_set_drvdata(pdev, plcd);
104         platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
105
106         return 0;
107
108  err_mem:
109         kfree(plcd);
110         return err;
111 }
112
113 static int __devexit platform_lcd_remove(struct platform_device *pdev)
114 {
115         struct platform_lcd *plcd = platform_get_drvdata(pdev);
116
117         lcd_device_unregister(plcd->lcd);
118         kfree(plcd);
119
120         return 0;
121 }
122
123 #ifdef CONFIG_PM
124 static int platform_lcd_suspend(struct platform_device *pdev, pm_message_t st)
125 {
126         struct platform_lcd *plcd = platform_get_drvdata(pdev);
127
128         plcd->suspended = 1;
129         platform_lcd_set_power(plcd->lcd, plcd->power);
130
131         return 0;
132 }
133
134 static int platform_lcd_resume(struct platform_device *pdev)
135 {
136         struct platform_lcd *plcd = platform_get_drvdata(pdev);
137
138         plcd->suspended = 0;
139         platform_lcd_set_power(plcd->lcd, plcd->power);
140
141         return 0;
142 }
143 #else
144 #define platform_lcd_suspend NULL
145 #define platform_lcd_resume NULL
146 #endif
147
148 static struct platform_driver platform_lcd_driver = {
149         .driver         = {
150                 .name   = "platform-lcd",
151                 .owner  = THIS_MODULE,
152         },
153         .probe          = platform_lcd_probe,
154         .remove         = __devexit_p(platform_lcd_remove),
155         .suspend        = platform_lcd_suspend,
156         .resume         = platform_lcd_resume,
157 };
158
159 static int __init platform_lcd_init(void)
160 {
161         return platform_driver_register(&platform_lcd_driver);
162 }
163
164 static void __exit platform_lcd_cleanup(void)
165 {
166         platform_driver_unregister(&platform_lcd_driver);
167 }
168
169 module_init(platform_lcd_init);
170 module_exit(platform_lcd_cleanup);
171
172 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
173 MODULE_LICENSE("GPL v2");
174 MODULE_ALIAS("platform:platform-lcd");