/* * linux/arch/arm/mach-footbridge/ebsa285-leds.c * * Copyright (C) 1998-1999 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * EBSA-285 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 * * Changelog: * 02-05-1999 RMK Various cleanups */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/spinlock.h> #include <mach/hardware.h> #include <asm/leds.h> #include <asm/mach-types.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 DEFINE_SPINLOCK(leds_lock); static void 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_CPU 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_AMBER; break; case led_idle_end: if (!(led_state & LED_STATE_CLAIMED)) hw_led_state &= ~XBUS_LED_AMBER; break; #endif case led_halted: if (!(led_state & LED_STATE_CLAIMED)) hw_led_state &= ~XBUS_LED_RED; break; 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); } static int __init leds_init(void) { if (machine_is_ebsa285()) leds_event = ebsa285_leds_event; leds_event(led_start); return 0; } __initcall(leds_init);