linux_kernel/arch/arm/mach-at91/leds.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/gpio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>

#include "board.h"
#include "gpio.h"


/* ------------------------------------------------------------------------- */

#if defined(CONFIG_NEW_LEDS)

/*
 * New cross-platform LED support.
 */

static struct gpio_led_platform_data led_data;

static struct platform_device at91_gpio_leds_device = {
	.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_gpio_leds_device);
}

#else
void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
#endif


/* ------------------------------------------------------------------------- */

#if defined (CONFIG_LEDS_ATMEL_PWM)

/*
 * PWM Leds
 */

static struct gpio_led_platform_data pwm_led_data;

static struct platform_device at91_pwm_leds_device = {
	.name			= "leds-atmel-pwm",
	.id			= -1,
	.dev.platform_data	= &pwm_led_data,
};

void __init at91_pwm_leds(struct gpio_led *leds, int nr)
{
	int i;
	u32 pwm_mask = 0;

	if (!nr)
		return;

	for (i = 0; i < nr; i++)
		pwm_mask |= (1 << leds[i].gpio);

	pwm_led_data.leds = leds;
	pwm_led_data.num_leds = nr;

	at91_add_device_pwm(pwm_mask);
	platform_device_register(&at91_pwm_leds_device);
}
#else
void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
#endif