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/*
* arch/arm/kernel/leds-footbridge.c
*
* Copyright (C) 1998-1999 Russell King
*
* EBSA-285 and NetWinder LED control routines.
*
* The EBSA-285 uses the leds as follows:
* - Green - toggles state every 50 timer interrupts
* - Amber - On if system is not idle
* - Red - currently unused
*
* The Netwinder uses the leds as follows:
* - Green - toggles state every 50 timer interrupts
* - Red - On if the system is not idle
*
* Changelog:
* 02-05-1999 RMK Various cleanups
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/hardware.h>
#include <asm/leds.h>
#include <asm/system.h>
#define LED_STATE_ENABLED 1
#define LED_STATE_CLAIMED 2
static char led_state;
static char hw_led_state;
static spinlock_t leds_lock = SPIN_LOCK_UNLOCKED;
extern spinlock_t gpio_lock;
#ifdef CONFIG_FOOTBRIDGE
static void __ebsa285_text ebsa285_leds_event(led_event_t evt)
{
unsigned long flags;
spin_lock_irqsave(&leds_lock, flags);
switch (evt) {
case led_start:
hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
#ifndef CONFIG_LEDS_IDLE
hw_led_state |= XBUS_LED_AMBER;
#endif
led_state |= LED_STATE_ENABLED;
break;
case led_stop:
led_state &= ~LED_STATE_ENABLED;
break;
case led_claim:
led_state |= LED_STATE_CLAIMED;
hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
break;
case led_release:
led_state &= ~LED_STATE_CLAIMED;
hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
break;
#ifdef CONFIG_LEDS_TIMER
case led_timer:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state ^= XBUS_LED_GREEN;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= XBUS_LED_RED;
break;
case led_idle_end:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~XBUS_LED_RED;
break;
#endif
case led_green_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~XBUS_LED_GREEN;
break;
case led_green_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= XBUS_LED_GREEN;
break;
case led_amber_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~XBUS_LED_AMBER;
break;
case led_amber_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= XBUS_LED_AMBER;
break;
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~XBUS_LED_RED;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= XBUS_LED_RED;
break;
default:
break;
}
if (led_state & LED_STATE_ENABLED)
*XBUS_LEDS = hw_led_state;
spin_unlock_irqrestore(&leds_lock, flags);
}
#endif
#ifdef CONFIG_ARCH_NETWINDER
static void __netwinder_text netwinder_leds_event(led_event_t evt)
{
unsigned long flags;
spin_lock_irqsave(&leds_lock, flags);
switch (evt) {
case led_start:
led_state |= LED_STATE_ENABLED;
hw_led_state = GPIO_GREEN_LED;
break;
case led_stop:
led_state &= ~LED_STATE_ENABLED;
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 ^= GPIO_GREEN_LED;
break;
#endif
#ifdef CONFIG_LEDS_CPU
case led_idle_start:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state &= ~GPIO_RED_LED;
break;
case led_idle_end:
if (!(led_state & LED_STATE_CLAIMED))
hw_led_state |= GPIO_RED_LED;
break;
#endif
case led_green_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= GPIO_GREEN_LED;
break;
case led_green_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~GPIO_GREEN_LED;
break;
case led_amber_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
break;
case led_amber_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
break;
case led_red_on:
if (led_state & LED_STATE_CLAIMED)
hw_led_state |= GPIO_RED_LED;
break;
case led_red_off:
if (led_state & LED_STATE_CLAIMED)
hw_led_state &= ~GPIO_RED_LED;
break;
default:
break;
}
spin_unlock_irqrestore(&leds_lock, flags);
if (led_state & LED_STATE_ENABLED) {
spin_lock_irqsave(&gpio_lock, flags);
gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
spin_unlock_irqrestore(&gpio_lock, flags);
}
}
#endif
static void dummy_leds_event(led_event_t evt)
{
}
static void __init
init_leds_event(led_event_t evt)
{
leds_event = dummy_leds_event;
#ifdef CONFIG_FOOTBRIDGE
if (machine_is_ebsa285() || machine_is_co285())
leds_event = ebsa285_leds_event;
#endif
#ifdef CONFIG_ARCH_NETWINDER
if (machine_is_netwinder())
leds_event = netwinder_leds_event;
#endif
leds_event(evt);
}
void (*leds_event)(led_event_t) = init_leds_event;
EXPORT_SYMBOL(leds_event);
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