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         .flags                  = LED_CORE_SUSPENDRESUME,
  49 };
  50
  51 static struct led_classdev hp6xx_green_led = {
  52         .name                   = "hp6xx:green",
  53         .default_trigger        = "ide-disk",
  54         .brightness_set         = hp6xxled_green_set,
  55         .flags                  = LED_CORE_SUSPENDRESUME,
  56 };
  57
  58 static int hp6xxled_probe(struct platform_device *pdev)
  59 {
  60         int ret;
  61
  62         ret = led_classdev_register(&pdev->dev, &hp6xx_red_led);
  63         if (ret < 0)
  64                 return ret;
  65
  66         ret = led_classdev_register(&pdev->dev, &hp6xx_green_led);
  67         if (ret < 0)
  68                 led_classdev_unregister(&hp6xx_red_led);
  69
  70         return ret;
  71 }
  72
  73 static int hp6xxled_remove(struct platform_device *pdev)
  74 {
  75         led_classdev_unregister(&hp6xx_red_led);
  76         led_classdev_unregister(&hp6xx_green_led);
  77
  78         return 0;
  79 }
  80
  81 /* work with hotplug and coldplug */
  82 MODULE_ALIAS("platform:hp6xx-led");
  83
  84 static struct platform_driver hp6xxled_driver = {
  85         .probe          = hp6xxled_probe,
  86         .remove         = hp6xxled_remove,
  87         .driver         = {
  88                 .name           = "hp6xx-led",
  89                 .owner          = THIS_MODULE,
  90         },
  91 };
  92
  93 static int __init hp6xxled_init(void)
  94 {
  95         return platform_driver_register(&hp6xxled_driver);
  96 }
  97
  98 static void __exit hp6xxled_exit(void)
  99 {
 100         platform_driver_unregister(&hp6xxled_driver);
 101 }
 102
 103 module_init(hp6xxled_init);
 104 module_exit(hp6xxled_exit);
 105
 106 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 107 MODULE_DESCRIPTION("HP Jornada 6xx LED driver");
 108 MODULE_LICENSE("GPL");