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/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/leds.h>
  18 #include <asm/hd64461.h>
  19 #include <mach/hp6xx.h>
  20
  21 static void hp6xxled_green_set(struct led_classdev *led_cdev,
  22                                enum led_brightness value)
  23 {
  24         u8 v8;
  25
  26         v8 = inb(PKDR);
  27         if (value)
  28                 outb(v8 & (~PKDR_LED_GREEN), PKDR);
  29         else
  30                 outb(v8 | PKDR_LED_GREEN, PKDR);
  31 }
  32
  33 static void hp6xxled_red_set(struct led_classdev *led_cdev,
  34                              enum led_brightness value)
  35 {
  36         u16 v16;
  37
  38         v16 = inw(HD64461_GPBDR);
  39         if (value)
  40                 outw(v16 & (~HD64461_GPBDR_LED_RED), HD64461_GPBDR);
  41         else
  42                 outw(v16 | HD64461_GPBDR_LED_RED, HD64461_GPBDR);
  43 }
  44
  45 static struct led_classdev hp6xx_red_led = {
  46         .name                   = "hp6xx:red",
  47         .default_trigger        = "hp6xx-charge",
  48         .brightness_set         = hp6xxled_red_set,
  49         .flags                  = LED_CORE_SUSPENDRESUME,
  50 };
  51
  52 static struct led_classdev hp6xx_green_led = {
  53         .name                   = "hp6xx:green",
  54         .default_trigger        = "ide-disk",
  55         .brightness_set         = hp6xxled_green_set,
  56         .flags                  = LED_CORE_SUSPENDRESUME,
  57 };
  58
  59 static int hp6xxled_probe(struct platform_device *pdev)
  60 {
  61         int ret;
  62
  63         ret = led_classdev_register(&pdev->dev, &hp6xx_red_led);
  64         if (ret < 0)
  65                 return ret;
  66
  67         ret = led_classdev_register(&pdev->dev, &hp6xx_green_led);
  68         if (ret < 0)
  69                 led_classdev_unregister(&hp6xx_red_led);
  70
  71         return ret;
  72 }
  73
  74 static int hp6xxled_remove(struct platform_device *pdev)
  75 {
  76         led_classdev_unregister(&hp6xx_red_led);
  77         led_classdev_unregister(&hp6xx_green_led);
  78
  79         return 0;
  80 }
  81
  82 /* work with hotplug and coldplug */
  83 MODULE_ALIAS("platform:hp6xx-led");
  84
  85 static struct platform_driver hp6xxled_driver = {
  86         .probe          = hp6xxled_probe,
  87         .remove         = hp6xxled_remove,
  88         .driver         = {
  89                 .name           = "hp6xx-led",
  90                 .owner          = THIS_MODULE,
  91         },
  92 };
  93
  94 static int __init hp6xxled_init(void)
  95 {
  96         return platform_driver_register(&hp6xxled_driver);
  97 }
  98
  99 static void __exit hp6xxled_exit(void)
 100 {
 101         platform_driver_unregister(&hp6xxled_driver);
 102 }
 103
 104 module_init(hp6xxled_init);
 105 module_exit(hp6xxled_exit);
 106
 107 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
 108 MODULE_DESCRIPTION("HP Jornada 6xx LED driver");
 109 MODULE_LICENSE("GPL");