drivers/leds/leds-locomo.c

   1 /*
   2  * linux/drivers/leds/leds-locomo.c
   3  *
   4  * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/device.h>
  14 #include <linux/leds.h>
  15
  16 #include <asm/hardware.h>
  17 #include <asm/hardware/locomo.h>
  18
  19 static void locomoled_brightness_set(struct led_classdev *led_cdev,
  20                                 enum led_brightness value, int offset)
  21 {
  22         struct locomo_dev *locomo_dev = LOCOMO_DEV(led_cdev->dev);
  23         unsigned long flags;
  24
  25         local_irq_save(flags);
  26         if (value)
  27                 locomo_writel(LOCOMO_LPT_TOFH, locomo_dev->mapbase + offset);
  28         else
  29                 locomo_writel(LOCOMO_LPT_TOFL, locomo_dev->mapbase + offset);
  30         local_irq_restore(flags);
  31 }
  32
  33 static void locomoled_brightness_set0(struct led_classdev *led_cdev,
  34                                 enum led_brightness value)
  35 {
  36         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT0);
  37 }
  38
  39 static void locomoled_brightness_set1(struct led_classdev *led_cdev,
  40                                 enum led_brightness value)
  41 {
  42         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT1);
  43 }
  44
  45 static struct led_classdev locomo_led0 = {
  46         .name                   = "locomo:amber",
  47         .default_trigger        = "sharpsl-charge",
  48         .brightness_set         = locomoled_brightness_set0,
  49 };
  50
  51 static struct led_classdev locomo_led1 = {
  52         .name                   = "locomo:green",
  53         .default_trigger        = "nand-disk",
  54         .brightness_set         = locomoled_brightness_set1,
  55 };
  56
  57 static int locomoled_probe(struct locomo_dev *ldev)
  58 {
  59         int ret;
  60
  61         ret = led_classdev_register(&ldev->dev, &locomo_led0);
  62         if (ret < 0)
  63                 return ret;
  64
  65         ret = led_classdev_register(&ldev->dev, &locomo_led1);
  66         if (ret < 0)
  67                 led_classdev_unregister(&locomo_led0);
  68
  69         return ret;
  70 }
  71
  72 static int locomoled_remove(struct locomo_dev *dev)
  73 {
  74         led_classdev_unregister(&locomo_led0);
  75         led_classdev_unregister(&locomo_led1);
  76         return 0;
  77 }
  78
  79 static struct locomo_driver locomoled_driver = {
  80         .drv = {
  81                 .name = "locomoled"
  82         },
  83         .devid  = LOCOMO_DEVID_LED,
  84         .probe  = locomoled_probe,
  85         .remove = locomoled_remove,
  86 };
  87
  88 static int __init locomoled_init(void)
  89 {
  90         return locomo_driver_register(&locomoled_driver);
  91 }
  92 module_init(locomoled_init);
  93
  94 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
  95 MODULE_DESCRIPTION("Locomo LED driver");
  96 MODULE_LICENSE("GPL");