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/*
* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*
* The LED can be used for debugging purpose. To enalbe the LEDs, in the
* config file, select:
* CONFIG_LEDS
* CONFIG_LEDS_TIMER --- enable the OS tick LED once every 50 ticks (.5sec)
* CONFIG_LEDS_CPU --- enable the cpu idle in/out LED (blink fast)
*
* The two LEDs can be disabled through user space by issuing:
* echo "claim" > /sys/devices/system/leds/leds0/event
* To release the LEDs back to the normal operation, do:
* echo "release" > /sys/devices/system/leds/leds0/event
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/ioport.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/leds.h>
#define LED_STATE_ENABLED (1 << 0)
#define LED_STATE_CLAIMED (1 << 1)
static unsigned int led_state;
static unsigned int hw_led_state;
static void mxc_leds_event(led_event_t evt)
{
unsigned long flags;
local_irq_save(flags);
switch (evt) {
case led_start:
hw_led_state = MXC_BD_LED1 | MXC_BD_LED2;
led_state = LED_STATE_ENABLED;
break;
case led_stop:
case led_halted:
hw_led_state = 0;
led_state &= ~LED_STATE_ENABLED;
MXC_BD_LED_OFF(MXC_BD_LED1 | MXC_BD_LED2);
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = 0;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = 0;
break;
#ifdef CONFIG_LEDS_TIMER
case led_timer:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state ^= MXC_BD_LED1;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~MXC_BD_LED2;
break;
case led_idle_end:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= MXC_BD_LED2;
break;
#endif
default:
break;
}
if (led_state & LED_STATE_ENABLED) {
MXC_BD_LED_OFF(~hw_led_state);
MXC_BD_LED_ON(hw_led_state);
}
local_irq_restore(flags);
}
static int __init mxc_leds_init(void)
{
led_state = LED_STATE_ENABLED;
leds_event = mxc_leds_event;
return 0;
}
core_initcall(mxc_leds_init);
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