/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013, 2014 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/>.
 */

/** @file
 *  Gossen Metrawatt Metrahit 1x/2x drivers
 *  @internal
 */

#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 in send mode */

#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		= METRAHIT_2X + 1,	/**< Send mode */
	METRAHIT_22S		= METRAHIT_22SM + 1,	/**< Bidi mode */
	METRAHIT_22M		= METRAHIT_22S + 1,	/**< Bidi mode */
	METRAHIT_23S		= METRAHIT_22M + 1,
	METRAHIT_24S		= METRAHIT_23S + 1,
	METRAHIT_25S		= METRAHIT_24S + 1,
	METRAHIT_26SM		= METRAHIT_25S + 1,	/**< Send mode */
	METRAHIT_26S		= METRAHIT_26SM + 1,	/**< Bidi mode */
	METRAHIT_26M		= METRAHIT_26S + 1,	/**< Bidi mode */
	METRAHIT_28S		= METRAHIT_26M + 1,
	METRAHIT_29S		= METRAHIT_28S + 1,
};

/** 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 1000x. */
	gboolean vmains_29S;	/**< Measured ctmv is V mains (29S only). */
	int addr;           /**< Device address (1..15). */
	int cmd_idx;        /**< Parameter "Idx" (Index) of current command, if required. */
	int cmd_seq;        /**< Command sequence. Used to query status every n messages. */
	gboolean autorng;   /**< Auto range enabled. */
	float ubatt;        /**< Battery voltage. */
	uint8_t fw_ver_maj; /**< Firmware version major. */
	uint8_t fw_ver_min; /**< Firmware version minor. */
	int64_t req_sent_at;    /**< Request sent. */
	gboolean response_pending; /**< Request sent, response is pending. */

	/* 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 */
};

/* Forward declarations */
SR_PRIV int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_probe_group *probe_group);
SR_PRIV void create_cmd_14(guchar addr, guchar func, guchar* params, guchar* buf);
SR_PRIV void dump_msg14(guchar* buf, gboolean raw);
SR_PRIV int gmc_decode_model_bd(uint8_t mcode);
SR_PRIV int gmc_decode_model_sm(uint8_t mcode);
SR_PRIV int gmc_mh_1x_2x_receive_data(int fd, int revents, void *cb_data);
SR_PRIV int gmc_mh_2x_receive_data(int fd, int revents, void *cb_data);
SR_PRIV const char *gmc_model_str(enum model mcode);
SR_PRIV int process_msg14(struct sr_dev_inst *sdi);
SR_PRIV int req_meas14(const struct sr_dev_inst *sdi);
SR_PRIV int req_stat14(const struct sr_dev_inst *sdi, gboolean power_on);

#endif