/****************************************************************************
 *
 *   Copyright (c) 2012-2016 PX4 Development Team. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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 ****************************************************************************/

class MPU9250;

#pragma pack(push, 1)
	struct ak8963_regs {
		uint8_t st1;
		int16_t x;
		int16_t y;
		int16_t z;
		uint8_t st2;
	};
#pragma pack(pop)

/**
 * Helper class implementing the magnetometer driver node.
 */
class MPU9250_mag : public device::CDev
{
public:
	MPU9250_mag(MPU9250 *parent, const char *path);
	~MPU9250_mag();

	virtual ssize_t read(struct file *filp, char *buffer, size_t buflen);
	virtual int ioctl(struct file *filp, int cmd, unsigned long arg);
	virtual int init();

	void set_passthrough(uint8_t reg, uint8_t size, uint8_t *out = NULL);
	void passthrough_read(uint8_t reg, uint8_t *buf, uint8_t size);
	void passthrough_write(uint8_t reg, uint8_t val);
	void read_block(uint8_t reg, uint8_t *val, uint8_t count);

	void ak8963_read(void);
	void ak8963_reset(void);
	bool ak8963_setup(void);
	bool ak8963_check_id(void);

protected:
	friend class MPU9250;

	void measure(struct ak8963_regs data);
	int self_test(void);

private:
	MPU9250 *_parent;
	orb_advert_t _mag_topic;
	int _mag_orb_class_instance;
	int _mag_class_instance;
	bool _mag_reading_data;
	unsigned _mag_call_interval;
	ringbuffer::RingBuffer *_mag_reports;
	struct mag_scale _mag_scale;
	float _mag_range_scale;
	unsigned _mag_sample_rate;
	perf_counter_t _mag_reads;

	/* do not allow to copy this class due to pointer data members */
	MPU9250_mag(const MPU9250_mag &);
	MPU9250_mag operator=(const MPU9250_mag &);
};