drivers/leds/leds-hp6xx.c

   1 /*
   2  * LED Triggers Core
   3  * For the HP Jornada 620/660/680/690 handhelds
   4  *
   5  * Copyright 2008 Kristoffer Ericson <kristoffer.ericson@gmail.com>
   6  *     this driver is based on leds-spitz.c by Richard Purdie.
   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 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/leds.h>
  17 #include <asm/hd64461.h>
  18 #include <mach/hp6xx.h>
  19
  20 static void hp6xxled_green_set(struct led_classdev *led_cdev,
  21                                enum led_brightness value)
  22 {
  23         u8 v8;
  24
  25         v8 = inb(PKDR);
  26         if (value)
  27                 outb(v8 & (~PKDR_LED_GREEN), PKDR);
  28         else
  29                 outb(v8 | PKDR_LED_GREEN, PKDR);
  30 }
  31
  32 static void hp6xxled_red_set(struct led_classdev *led_cdev,
  33                              enum led_brightness value)
  34 {
  35         u16 v16;
  36
  37         v16 = inw(HD64461_GPBDR);
  38         if (value)
  39                 outw(v16 & (~HD64461_GPBDR_LED_RED), HD64461_GPBDR);
  40         else
  41                 outw(v16 | HD64461_GPBDR_LED_RED, HD64461_GPBDR);
  42 }
  43
  44 static struct led_classdev hp6xx_red_led = {
  45         .name                   = "hp6xx:red",
  46         .default_trigger        = "hp6xx-charge",
  47         .brightness_set         = hp6xxled_red_set,
  48 };
  49
  50 static struct led_classdev hp6xx_green_led = {
  51         .name                   = "hp6xx:green",
  52         .default_trigger        = "ide-disk",
  53         .brightness_set         = hp6xxled_green_set,
  54 };
  55
  56 #ifdef CONFIG_PM
  57 static int hp6xxled_suspend(struct platform_device *dev, pm_message_t state)
  58 {
  59         led_classdev_suspend(&hp6xx_red_led);
  60         led_classdev_suspend(&hp6xx_green_led);
  61         return 0;
  62 }
  63
  64 static int hp6xxled_resume(struct platform_device *dev)
  65 {
  66         led_classdev_resume(&hp6xx_red_led);
  67         led_classdev_resume(&hp6xx_green_led);
  68         return 0;
  69 }
  70 #endif
  71
  72 static int hp6xxled_probe(struct platform_device *pdev)
  73 {
  74         int ret;
  75
  76         ret = led_classdev_register(&pdev->dev, &hp6xx_red_led);
  77         if (ret < 0)
  78                 return ret;
  79
  80         ret = led_classdev_register(&pdev->dev, &hp6xx_green_led);
  81         if (ret < 0)
  82                 led_classdev_unregister(&hp6xx_red_led);
  83
  84         return ret;
  85 }
  86
  87 static int hp6xxled_remove(struct platform_device *pdev)
  88 {
  89         led_classdev_unregister(&hp6xx_red_led);
  90         led_classdev_unregister(&hp6xx_green_led);
  91
  92         return 0;
  93 }
  94
  95 /* work with hotplug and coldplug */
  96 MODULE_ALIAS("platform:hp6xx-led");
  97
  98 static struct platform_driver hp6xxled_driver = {
  99         .probe          = hp6xxled_probe,
 100         .remove         = hp6xxled_remove,
 101 #ifdef CONFIG_PM
 102         .suspend        = hp6xxled_suspend,
 103         .resume         = hp6xxled_resume,
 104 #endif
 105         .driver         = {
 106                 .name           = "hp6xx-led",
 107                 .owner          = THIS_MODULE,
 108         },
 109 };
 110
 111 static int __init hp6xxled_init(void)
 112 {
 113         return platform_driver_register(&hp6xxled_driver);
 114 }
 115
 116 static void __exit hp6xxled_exit(void)
 117 {
 118         platform_driver_unregister(&hp6xxled_driver);
 119 }
 120
 121 module_init(hp6xxled_init);
 122 module_exit(hp6xxled_exit);
 123
 124 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 125 MODULE_DESCRIPTION("HP Jornada 6xx LED driver");
 126 MODULE_LICENSE("GPL");