px4-firmware/apps/drivers/led/led.cpp

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/**
 * @file led.cpp
 *
 * LED driver.
 */

#include <nuttx/config.h>
#include <drivers/device/device.h>
#include <drivers/drv_led.h>

/* Ideally we'd be able to get these from up_internal.h */
//#include <up_internal.h>
__BEGIN_DECLS
extern void up_ledinit();
extern void up_ledon(int led);
extern void up_ledoff(int led);
__END_DECLS

class LED : device::CDev
{
public:
	LED();
	~LED();

	virtual int		init();
	virtual int		ioctl(struct file *filp, int cmd, unsigned long arg);
};

LED::LED() :
	CDev("led", LED_DEVICE_PATH)
{
	// force immediate init/device registration
	init();
}

LED::~LED()
{
}

int
LED::init()
{
	CDev::init();
	up_ledinit();

	return 0;
}

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

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

	case LED_OFF:
		up_ledoff(arg);
		break;

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

namespace
{
LED	*gLED;
}

void
drv_led_start()
{
	if (gLED == nullptr) {
		gLED = new LED;
		if (gLED != nullptr)
			gLED->init();
	}
}