/* * linux/arch/arm/mach-sa1100/leds-lart.c * * (C) Erik Mouw (J.A.K.Mouw@its.tudelft.nl), April 21, 2000 * * LART uses the LED as follows: * - GPIO23 is the LED, on if system is not idle * You can use both CONFIG_LEDS_CPU and CONFIG_LEDS_TIMER at the same * time, but in that case the timer events will still dictate the * pace of the LED. */ #include <linux/init.h> #include <asm/hardware.h> #include <asm/leds.h> #include <asm/system.h> #include "leds.h" #define LED_STATE_ENABLED 1 #define LED_STATE_CLAIMED 2 static unsigned int led_state; static unsigned int hw_led_state; #define LED_23 GPIO_GPIO23 #define LED_MASK (LED_23) void lart_leds_event(led_event_t evt) { unsigned long flags; local_irq_save(flags); switch(evt) { case led_start: /* pin 23 is output pin */ GPDR |= LED_23; hw_led_state = LED_MASK; 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 = LED_MASK; break; case led_release: led_state &= ~LED_STATE_CLAIMED; hw_led_state = LED_MASK; break; #ifdef CONFIG_LEDS_TIMER case led_timer: if (!(led_state & LED_STATE_CLAIMED)) hw_led_state ^= LED_23; break; #endif #ifdef CONFIG_LEDS_CPU case led_idle_start: /* The LART people like the LED to be off when the system is idle... */ if (!(led_state & LED_STATE_CLAIMED)) hw_led_state &= ~LED_23; break; case led_idle_end: /* ... and on if the system is not idle */ if (!(led_state & LED_STATE_CLAIMED)) hw_led_state |= LED_23; break; #endif case led_red_on: if (led_state & LED_STATE_CLAIMED) hw_led_state &= ~LED_23; break; case led_red_off: if (led_state & LED_STATE_CLAIMED) hw_led_state |= LED_23; break; default: break; } /* Now set the GPIO state, or nothing will happen at all */ if (led_state & LED_STATE_ENABLED) { GPSR = hw_led_state; GPCR = hw_led_state ^ LED_MASK; } local_irq_restore(flags); }