led.cpp 3.05 KB
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 *
 *   Copyright (c) 2013 PX4 Development Team. All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
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 *
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 *    used to endorse or promote products derived from this software
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * @file led.cpp
 *
 * LED driver to control the onboard LED(s) via ioctl interface.
 */

#include <px4_platform_common/px4_config.h>
#include <lib/cdev/CDev.hpp>
#include <drivers/drv_board_led.h>
#include <stdio.h>

/*
 * Ideally we'd be able to get these from arm_internal.h,
 * but since we want to be able to disable the NuttX use
 * of leds for system indication at will and there is no
 * separate switch, we need to build independent of the
 * CONFIG_ARCH_LEDS configuration switch.
 */
__BEGIN_DECLS
extern void led_init();
extern void led_on(int led);
extern void led_off(int led);
extern void led_toggle(int led);
__END_DECLS

class LED : cdev::CDev
{
public:
	LED();
	~LED() override = default;

	int	init() override;
	int	ioctl(cdev::file_t *filp, int cmd, unsigned long arg) override;
};

LED::LED() : CDev(LED0_DEVICE_PATH)
{
	// force immediate init/device registration
	init();
}

int
LED::init()
{
	PX4_DEBUG("LED::init");

	CDev::init();

	led_init();

	return 0;
}

int
LED::ioctl(cdev::file_t *filp, int cmd, unsigned long arg)
{
	int result = OK;

	switch (cmd) {
	case LED_ON:
		led_on(arg);
		break;

	case LED_OFF:
		led_off(arg);
		break;

	case LED_TOGGLE:
		led_toggle(arg);
		break;

	default:
		result = CDev::ioctl(filp, cmd, arg);
	}

	return result;
}

namespace
{
LED	*gLED;
}

void
drv_led_start(void)
{
	if (gLED == nullptr) {
		gLED = new LED;
	}
}