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Linux/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 #include <linux/of.h>
 20 #include <linux/slab.h>
 21 
 22 #include <video/platform_lcd.h>
 23 
 24 struct platform_lcd {
 25         struct device           *us;
 26         struct lcd_device       *lcd;
 27         struct plat_lcd_data    *pdata;
 28 
 29         unsigned int             power;
 30         unsigned int             suspended:1;
 31 };
 32 
 33 static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd)
 34 {
 35         return lcd_get_data(lcd);
 36 }
 37 
 38 static int platform_lcd_get_power(struct lcd_device *lcd)
 39 {
 40         struct platform_lcd *plcd = to_our_lcd(lcd);
 41 
 42         return plcd->power;
 43 }
 44 
 45 static int platform_lcd_set_power(struct lcd_device *lcd, int power)
 46 {
 47         struct platform_lcd *plcd = to_our_lcd(lcd);
 48         int lcd_power = 1;
 49 
 50         if (power == FB_BLANK_POWERDOWN || plcd->suspended)
 51                 lcd_power = 0;
 52 
 53         plcd->pdata->set_power(plcd->pdata, lcd_power);
 54         plcd->power = power;
 55 
 56         return 0;
 57 }
 58 
 59 static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info)
 60 {
 61         struct platform_lcd *plcd = to_our_lcd(lcd);
 62         struct plat_lcd_data *pdata = plcd->pdata;
 63 
 64         if (pdata->match_fb)
 65                 return pdata->match_fb(pdata, info);
 66 
 67         return plcd->us->parent == info->device;
 68 }
 69 
 70 static struct lcd_ops platform_lcd_ops = {
 71         .get_power      = platform_lcd_get_power,
 72         .set_power      = platform_lcd_set_power,
 73         .check_fb       = platform_lcd_match,
 74 };
 75 
 76 static int platform_lcd_probe(struct platform_device *pdev)
 77 {
 78         struct plat_lcd_data *pdata;
 79         struct platform_lcd *plcd;
 80         struct device *dev = &pdev->dev;
 81         int err;
 82 
 83         pdata = dev_get_platdata(&pdev->dev);
 84         if (!pdata) {
 85                 dev_err(dev, "no platform data supplied\n");
 86                 return -EINVAL;
 87         }
 88 
 89         if (pdata->probe) {
 90                 err = pdata->probe(pdata);
 91                 if (err)
 92                         return err;
 93         }
 94 
 95         plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
 96                             GFP_KERNEL);
 97         if (!plcd)
 98                 return -ENOMEM;
 99 
100         plcd->us = dev;
101         plcd->pdata = pdata;
102         plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev,
103                                                 plcd, &platform_lcd_ops);
104         if (IS_ERR(plcd->lcd)) {
105                 dev_err(dev, "cannot register lcd device\n");
106                 return PTR_ERR(plcd->lcd);
107         }
108 
109         platform_set_drvdata(pdev, plcd);
110         platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL);
111 
112         return 0;
113 }
114 
115 #ifdef CONFIG_PM_SLEEP
116 static int platform_lcd_suspend(struct device *dev)
117 {
118         struct platform_lcd *plcd = dev_get_drvdata(dev);
119 
120         plcd->suspended = 1;
121         platform_lcd_set_power(plcd->lcd, plcd->power);
122 
123         return 0;
124 }
125 
126 static int platform_lcd_resume(struct device *dev)
127 {
128         struct platform_lcd *plcd = dev_get_drvdata(dev);
129 
130         plcd->suspended = 0;
131         platform_lcd_set_power(plcd->lcd, plcd->power);
132 
133         return 0;
134 }
135 #endif
136 
137 static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend,
138                         platform_lcd_resume);
139 
140 #ifdef CONFIG_OF
141 static const struct of_device_id platform_lcd_of_match[] = {
142         { .compatible = "platform-lcd" },
143         {},
144 };
145 MODULE_DEVICE_TABLE(of, platform_lcd_of_match);
146 #endif
147 
148 static struct platform_driver platform_lcd_driver = {
149         .driver         = {
150                 .name   = "platform-lcd",
151                 .owner  = THIS_MODULE,
152                 .pm     = &platform_lcd_pm_ops,
153                 .of_match_table = of_match_ptr(platform_lcd_of_match),
154         },
155         .probe          = platform_lcd_probe,
156 };
157 
158 module_platform_driver(platform_lcd_driver);
159 
160 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
161 MODULE_LICENSE("GPL v2");
162 MODULE_ALIAS("platform:platform-lcd");
163 

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