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