Root/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/system.h>
21#include <asm/mach-types.h>
22
23static spinlock_t leds_lock;
24
25static void ebsa110_leds_event(led_event_t ledevt)
26{
27    unsigned long flags;
28
29    spin_lock_irqsave(&leds_lock, flags);
30
31    switch(ledevt) {
32    case led_timer:
33        *(volatile unsigned char *)SOFT_BASE ^= 128;
34        break;
35
36    default:
37        break;
38    }
39
40    spin_unlock_irqrestore(&leds_lock, flags);
41}
42
43static int __init leds_init(void)
44{
45    if (machine_is_ebsa110())
46        leds_event = ebsa110_leds_event;
47
48    return 0;
49}
50
51__initcall(leds_init);
52

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