100 lines
1.8 KiB
C
100 lines
1.8 KiB
C
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/*
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* LED driver for Atmel AT91-based boards.
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*
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* Copyright (C) SAN People (Pty) Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <asm/mach-types.h>
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#include <asm/leds.h>
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#include <asm/arch/board.h>
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#include <asm/arch/gpio.h>
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static inline void at91_led_on(unsigned int led)
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{
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at91_set_gpio_value(led, 0);
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}
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static inline void at91_led_off(unsigned int led)
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{
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at91_set_gpio_value(led, 1);
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}
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static inline void at91_led_toggle(unsigned int led)
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{
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unsigned long is_off = at91_get_gpio_value(led);
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if (is_off)
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at91_led_on(led);
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else
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at91_led_off(led);
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}
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/*
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* Handle LED events.
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*/
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static void at91_leds_event(led_event_t evt)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch(evt) {
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case led_start: /* System startup */
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at91_led_on(at91_leds_cpu);
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break;
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case led_stop: /* System stop / suspend */
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at91_led_off(at91_leds_cpu);
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break;
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#ifdef CONFIG_LEDS_TIMER
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case led_timer: /* Every 50 timer ticks */
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at91_led_toggle(at91_leds_timer);
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break;
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#endif
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#ifdef CONFIG_LEDS_CPU
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case led_idle_start: /* Entering idle state */
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at91_led_off(at91_leds_cpu);
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break;
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case led_idle_end: /* Exit idle state */
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at91_led_on(at91_leds_cpu);
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break;
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#endif
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default:
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break;
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}
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local_irq_restore(flags);
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}
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static int __init leds_init(void)
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{
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if (!at91_leds_timer || !at91_leds_cpu)
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return -ENODEV;
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/* Enable PIO to access the LEDs */
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at91_set_gpio_output(at91_leds_timer, 1);
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at91_set_gpio_output(at91_leds_cpu, 1);
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leds_event = at91_leds_event;
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leds_event(led_start);
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return 0;
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}
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__initcall(leds_init);
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