/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Matthias Heidbrink <m-sigrok@heidbrink.biz>
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LIBSIGROK_HARDWARE_GMC_MH_1X_2X_PROTOCOL_H
#define LIBSIGROK_HARDWARE_GMC_MH_1X_2X_PROTOCOL_H

#include <stdint.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"

#define LOG_PREFIX "gmc-mh-1x-2x"

#define GMC_BUFSIZE  266

/** Message ID bits 4, 5 */
#define MSGID_MASK  0x30 /**< Mask to get message ID bits */
#define MSGID_INF   0x00 /**< Start of message with device info */
#define MSGID_D10   0x10 /**< Start of data message, non-displayed intermediate */
#define MSGID_DTA   0x20 /**< Start of data message, displayed, averaged */
#define MSGID_DATA  0x30 /**< Data byte in message */

#define MSGC_MASK   0x0f  /**< Mask to get message byte contents */

#define MSGSRC_MASK 0xc0 /**< Mask to get bits related to message source */

#define bc(x) (x & MSGC_MASK) /**< Get contents from a byte */

#define MASK_6BITS  0x3f /**< Mask lower six bits. */

/**
 * Internal multimeter model codes. In opposite to the multimeter models from
 * protocol (see decode_model()), these codes allow working with ranges.
 */
enum model {
	METRAHIT_NONE		= 0,  /**< Value for uninitialized variable */
	METRAHIT_12S		= 12,
	METRAHIT_13S14A		= 13,
	METRAHIT_14S		= 14,
	METRAHIT_15S		= 15,
	METRAHIT_16S		= 16,
	METRAHIT_16I		= 17,
	METRAHIT_16X = METRAHIT_16I,  /**< All Metrahit 16 */
	/* A Metrahit 17 exists, but seems not to have an IR interface. */
	METRAHIT_18S		= 18,
	METRAHIT_2X		= 20, /**< For model type comparisons */
	METRAHIT_22SM		= 22,
	METRAHIT_23S		= 23,
	METRAHIT_24S		= 24,
	METRAHIT_25SM		= 25,
	METRAHIT_26S		= 26,
	METRAHIT_28S		= 28,
	METRAHIT_29S		= 29,
};

/** Convert GMC model code in send mode to sigrok-internal one. */
SR_PRIV int gmc_decode_model_sm(uint8_t mcode);

/**
 * Convert GMC model code in bidirectional mode to sigrok-internal one.
 *
 * @param[in] mcode Model code.
 *
 * @return Model code.
 */
SR_PRIV int gmc_decode_model_bidi(uint8_t mcode);

/** Get model string from sigrok-internal model code. */
SR_PRIV const char *gmc_model_str(enum model mcode);

/** Private, per-device-instance driver context. */
struct dev_context {
	/* Model-specific information */
	enum model model;	/**< Model code. */

	/* Acquisition settings */
	uint64_t limit_samples;	/**< Target number of samples */
	uint64_t limit_msec;	/**< Target sampling time */

	/* Opaque pointer passed in by frontend. */
	void *cb_data;

	/* Operational state */
	gboolean settings_ok;	/**< Settings msg received yet. */
	int msg_type;	/**< Message type (MSGID_INF, ...). */
	int msg_len;	/**< Message lengh (valid when msg, curr. type known).*/
	int mq;		/**< Measured quantity */
	int unit;		/**< Measured unit */
	uint64_t mqflags;	/**< Measured quantity flags */
	float value;		/**< Measured value */
	float scale;		/**< Scale for value. */
	int8_t scale1000;   /**< Additional scale factor 1000^x. */
	gboolean vmains_29S;	/**< Measured ctmv is V mains (29S only). */

	/* Temporary state across callbacks */
	uint64_t num_samples;	/**< Current #samples for limit_samples */
	GTimer *elapsed_msec;	/**< Used for sampling with limit_msec  */
	uint8_t buf[GMC_BUFSIZE];	/**< Buffer for read callback */
	int buflen;			/**< Data len in buf */
};

SR_PRIV int gmc_mh_1x_2x_receive_data(int fd, int revents, void *cb_data);

#endif