arch/arm/mach-ebsa110/leds.c

   1 /*
   2  *  linux/arch/arm/mach-ebsa110/leds.c
   3  *
   4  *  Copyright (C) 1998 Russell King
   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  *  EBSA-110 LED control routines.  We use the led as follows:
  11  *
  12  *   - Red - toggles state every 50 timer interrupts
  13  */
  14 #include <linux/module.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/init.h>
  17
  18 #include <mach/hardware.h>
  19 #include <asm/leds.h>
  20 #include <asm/mach-types.h>
  21
  22 static spinlock_t leds_lock;
  23
  24 static void ebsa110_leds_event(led_event_t ledevt)
  25 {
  26         unsigned long flags;
  27
  28         spin_lock_irqsave(&leds_lock, flags);
  29
  30         switch(ledevt) {
  31         case led_timer:
  32                 *(volatile unsigned char *)SOFT_BASE ^= 128;
  33                 break;
  34
  35         default:
  36                 break;
  37         }
  38
  39         spin_unlock_irqrestore(&leds_lock, flags);
  40 }
  41
  42 static int __init leds_init(void)
  43 {
  44         if (machine_is_ebsa110())
  45                 leds_event = ebsa110_leds_event;
  46
  47         return 0;
  48 }
  49
  50 __initcall(leds_init);