162 lines
2.9 KiB
C
162 lines
2.9 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/mach-types.h>
|
|
#include <asm/arch/board.h>
|
|
#include <asm/arch/gpio.h>
|
|
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
#if defined(CONFIG_NEW_LEDS)
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
/*
|
|
* New cross-platform LED support.
|
|
*/
|
|
|
|
static struct gpio_led_platform_data led_data;
|
|
|
|
static struct platform_device at91_leds = {
|
|
.name = "leds-gpio",
|
|
.id = -1,
|
|
.dev.platform_data = &led_data,
|
|
};
|
|
|
|
void __init at91_gpio_leds(struct gpio_led *leds, int nr)
|
|
{
|
|
int i;
|
|
|
|
if (!nr)
|
|
return;
|
|
|
|
for (i = 0; i < nr; i++)
|
|
at91_set_gpio_output(leds[i].gpio, leds[i].active_low);
|
|
|
|
led_data.leds = leds;
|
|
led_data.num_leds = nr;
|
|
platform_device_register(&at91_leds);
|
|
}
|
|
|
|
#else
|
|
void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
|
|
#endif
|
|
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
#if defined(CONFIG_LEDS)
|
|
|
|
#include <asm/leds.h>
|
|
|
|
/*
|
|
* Old ARM-specific LED framework; not fully functional when generic time is
|
|
* in use.
|
|
*/
|
|
|
|
static u8 at91_leds_cpu;
|
|
static u8 at91_leds_timer;
|
|
|
|
static inline void at91_led_on(unsigned int led)
|
|
{
|
|
at91_set_gpio_value(led, 0);
|
|
}
|
|
|
|
static inline void at91_led_off(unsigned int led)
|
|
{
|
|
at91_set_gpio_value(led, 1);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
/*
|
|
* Handle LED events.
|
|
*/
|
|
static void at91_leds_event(led_event_t evt)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
|
|
switch(evt) {
|
|
case led_start: /* System startup */
|
|
at91_led_on(at91_leds_cpu);
|
|
break;
|
|
|
|
case led_stop: /* System stop / suspend */
|
|
at91_led_off(at91_leds_cpu);
|
|
break;
|
|
|
|
#ifdef CONFIG_LEDS_TIMER
|
|
case led_timer: /* Every 50 timer ticks */
|
|
at91_led_toggle(at91_leds_timer);
|
|
break;
|
|
#endif
|
|
|
|
#ifdef CONFIG_LEDS_CPU
|
|
case led_idle_start: /* Entering idle state */
|
|
at91_led_off(at91_leds_cpu);
|
|
break;
|
|
|
|
case led_idle_end: /* Exit idle state */
|
|
at91_led_on(at91_leds_cpu);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
|
|
static int __init leds_init(void)
|
|
{
|
|
if (!at91_leds_timer || !at91_leds_cpu)
|
|
return -ENODEV;
|
|
|
|
leds_event = at91_leds_event;
|
|
|
|
leds_event(led_start);
|
|
return 0;
|
|
}
|
|
|
|
__initcall(leds_init);
|
|
|
|
|
|
void __init at91_init_leds(u8 cpu_led, u8 timer_led)
|
|
{
|
|
/* Enable GPIO to access the LEDs */
|
|
at91_set_gpio_output(cpu_led, 1);
|
|
at91_set_gpio_output(timer_led, 1);
|
|
|
|
at91_leds_cpu = cpu_led;
|
|
at91_leds_timer = timer_led;
|
|
}
|
|
|
|
#else
|
|
void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
|
|
#endif
|