drivers/video/backlight/rk29_buttonlight.c

   1 /*
   2  * Copyright (C) 2009 Rockchip Corporation.
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/err.h>
  19 #include <linux/delay.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/debugfs.h>
  22 #include <linux/backlight.h>
  23 #include <linux/fb.h>
  24 #include <linux/cpufreq.h>
  25 #include <linux/clk.h>
  26
  27 #include <linux/earlysuspend.h>
  28 #include <asm/io.h>
  29 #include <mach/iomux.h>
  30 #include <mach/gpio.h>
  31 #include <mach/board.h>
  32
  33
  34 /*
  35  * Debug
  36  */
  37 #if 0
  38 #define DBG(x...)       printk(x)
  39 #else
  40 #define DBG(x...)
  41 #endif
  42
  43 static int rk29_button_light_value = 0;
  44 struct backlight_device * rk29_button_light_device;
  45
  46 static s32 rk29_set_button_light(struct backlight_device *bl)
  47 {
  48     struct rk29_button_light_info *button_light_info = bl->dev.parent->platform_data;
  49
  50     DBG(">>>>>>> rk29_set_button_light\n");
  51     if(bl->props.brightness)
  52         {
  53         gpio_set_value(button_light_info->led_on_pin, button_light_info->led_on_level);
  54         rk29_button_light_value = 255;
  55         }
  56     else
  57         {
  58         gpio_set_value(button_light_info->led_on_pin, button_light_info->led_on_level?0:1);
  59         rk29_button_light_value = 0;
  60         }
  61     return 0;
  62 }
  63
  64 static s32 rk29_get_button_light(struct backlight_device *bl)
  65 {
  66     DBG(">>>>>>> rk29_get_button_light\n");
  67     return rk29_button_light_value;
  68 }
  69
  70 static struct backlight_ops rk29_button_light_ops = {
  71         .update_status = rk29_set_button_light,
  72         .get_brightness = rk29_get_button_light,
  73 };
  74
  75 static int rk29_button_light_probe(struct platform_device *pdev)
  76 {
  77     struct rk29_button_light_info *button_light_info = pdev->dev.platform_data;
  78
  79         rk29_button_light_device = backlight_device_register("rk28_button_light", &pdev->dev, NULL, &rk29_button_light_ops,NULL);
  80         if (!rk29_button_light_device) {
  81         DBG("rk29_button_light_probe error\n");
  82                 return -ENODEV;
  83         }
  84
  85         rk29_button_light_device->props.power = FB_BLANK_UNBLANK;
  86         rk29_button_light_device->props.fb_blank = FB_BLANK_UNBLANK;
  87         rk29_button_light_device->props.max_brightness = 255;
  88         rk29_button_light_device->props.brightness = 255;
  89
  90     gpio_request(button_light_info->led_on_pin, NULL);
  91     gpio_direction_output(button_light_info->led_on_pin, button_light_info->led_on_level?0:1);
  92
  93     if (button_light_info && button_light_info->io_init)
  94         button_light_info->io_init();
  95
  96     return 0;
  97 }
  98
  99 static int rk29_button_light_remove(struct platform_device *pdev)
 100 {
 101
 102         if (rk29_button_light_device) {
 103                 backlight_device_unregister(rk29_button_light_device);
 104         return 0;
 105     } else {
 106         DBG("rk29_button_light_remove error\n");
 107         return -ENODEV;
 108     }
 109 }
 110
 111 static struct platform_driver rk29_button_light_driver = {
 112         .probe  = rk29_button_light_probe,
 113         .remove = rk29_button_light_remove,
 114         .driver = {
 115                 .name   = "rk29_button_light",
 116                 .owner  = THIS_MODULE,
 117         },
 118 };
 119
 120
 121 static int __init rk29_button_light_init(void)
 122 {
 123         platform_driver_register(&rk29_button_light_driver);
 124         return 0;
 125 }
 126
 127 static int __init rk29_button_light_exit(void)
 128 {
 129         platform_driver_unregister(&rk29_button_light_driver);
 130         return 0;
 131 }
 132
 133 late_initcall(rk29_button_light_init);
 134 module_exit(rk29_button_light_exit);
 135