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[ARM] 3393/2: AT91RM9200 LED support
Patch from Andrew Victor This patch adds support for the LED(s) on the AT91RM9200-based boards. (This version of the patch can be applied before Patch 3392/1) Signed-off-by: Andrew Victor <[email protected]> Signed-off-by: Russell King <[email protected]>
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Andrew Victor
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Apr 2, 2006
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/* | ||
* LED driver for Atmel AT91-based boards. | ||
* | ||
* Copyright (C) SAN People (Pty) Ltd | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License | ||
* as published by the Free Software Foundation; either version | ||
* 2 of the License, or (at your option) any later version. | ||
*/ | ||
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#include <linux/config.h> | ||
#include <linux/kernel.h> | ||
#include <linux/module.h> | ||
#include <linux/init.h> | ||
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#include <asm/mach-types.h> | ||
#include <asm/leds.h> | ||
#include <asm/arch/board.h> | ||
#include <asm/arch/gpio.h> | ||
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static inline void at91_led_on(unsigned int led) | ||
{ | ||
at91_set_gpio_value(led, 0); | ||
} | ||
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static inline void at91_led_off(unsigned int led) | ||
{ | ||
at91_set_gpio_value(led, 1); | ||
} | ||
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static inline void at91_led_toggle(unsigned int led) | ||
{ | ||
unsigned long is_off = at91_get_gpio_value(led); | ||
if (is_off) | ||
at91_led_on(led); | ||
else | ||
at91_led_off(led); | ||
} | ||
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/* | ||
* Handle LED events. | ||
*/ | ||
static void at91_leds_event(led_event_t evt) | ||
{ | ||
unsigned long flags; | ||
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local_irq_save(flags); | ||
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switch(evt) { | ||
case led_start: /* System startup */ | ||
at91_led_on(at91_leds_cpu); | ||
break; | ||
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case led_stop: /* System stop / suspend */ | ||
at91_led_off(at91_leds_cpu); | ||
break; | ||
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#ifdef CONFIG_LEDS_TIMER | ||
case led_timer: /* Every 50 timer ticks */ | ||
at91_led_toggle(at91_leds_timer); | ||
break; | ||
#endif | ||
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#ifdef CONFIG_LEDS_CPU | ||
case led_idle_start: /* Entering idle state */ | ||
at91_led_off(at91_leds_cpu); | ||
break; | ||
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case led_idle_end: /* Exit idle state */ | ||
at91_led_on(at91_leds_cpu); | ||
break; | ||
#endif | ||
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default: | ||
break; | ||
} | ||
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local_irq_restore(flags); | ||
} | ||
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static int __init leds_init(void) | ||
{ | ||
if (!at91_leds_timer || !at91_leds_cpu) | ||
return -ENODEV; | ||
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/* Enable PIO to access the LEDs */ | ||
at91_set_gpio_output(at91_leds_timer, 1); | ||
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); | ||
return 0; | ||
} | ||
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__initcall(leds_init); |
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