drivers/leds/leds-locomo.c

   1 /*
   2  * linux/drivers/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/config.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/leds.h>
  16
  17 #include <asm/hardware.h>
  18 #include <asm/hardware/locomo.h>
  19
  20 static void locomoled_brightness_set(struct led_classdev *led_cdev,
  21                                 enum led_brightness value, int offset)
  22 {
  23         struct locomo_dev *locomo_dev = LOCOMO_DEV(led_cdev->class_dev->dev);
  24         unsigned long flags;
  25
  26         local_irq_save(flags);
  27         if (value)
  28                 locomo_writel(LOCOMO_LPT_TOFH, locomo_dev->mapbase + offset);
  29         else
  30                 locomo_writel(LOCOMO_LPT_TOFL, locomo_dev->mapbase + offset);
  31         local_irq_restore(flags);
  32 }
  33
  34 static void locomoled_brightness_set0(struct led_classdev *led_cdev,
  35                                 enum led_brightness value)
  36 {
  37         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT0);
  38 }
  39
  40 static void locomoled_brightness_set1(struct led_classdev *led_cdev,
  41                                 enum led_brightness value)
  42 {
  43         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT1);
  44 }
  45
  46 static struct led_classdev locomo_led0 = {
  47         .name                   = "locomo:amber",
  48         .brightness_set         = locomoled_brightness_set0,
  49 };
  50
  51 static struct led_classdev locomo_led1 = {
  52         .name                   = "locomo:green",
  53         .brightness_set         = locomoled_brightness_set1,
  54 };
  55
  56 static int locomoled_probe(struct locomo_dev *ldev)
  57 {
  58         int ret;
  59
  60         ret = led_classdev_register(&ldev->dev, &locomo_led0);
  61         if (ret < 0)
  62                 return ret;
  63
  64         ret = led_classdev_register(&ldev->dev, &locomo_led1);
  65         if (ret < 0)
  66                 led_classdev_unregister(&locomo_led0);
  67
  68         return ret;
  69 }
  70
  71 static int locomoled_remove(struct locomo_dev *dev)
  72 {
  73         led_classdev_unregister(&locomo_led0);
  74         led_classdev_unregister(&locomo_led1);
  75         return 0;
  76 }
  77
  78 static struct locomo_driver locomoled_driver = {
  79         .drv = {
  80                 .name = "locomoled"
  81         },
  82         .devid  = LOCOMO_DEVID_LED,
  83         .probe  = locomoled_probe,
  84         .remove = locomoled_remove,
  85 };
  86
  87 static int __init locomoled_init(void)
  88 {
  89         return locomo_driver_register(&locomoled_driver);
  90 }
  91 module_init(locomoled_init);
  92
  93 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
  94 MODULE_DESCRIPTION("Locomo LED driver");
  95 MODULE_LICENSE("GPL");