[libsigrok.git] / src / hardware / gmc-mh-1x-2x / api.c

/*
 * 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
 */

#include <config.h>
#include <string.h>
#include "protocol.h"

/* Serial communication parameters for Metrahit 1x/2x with 'RS232' adaptor */
#define SERIALCOMM_1X_RS232 "8228/6n1/dtr=1/rts=1/flow=0" /* =8192, closer with divider */
#define SERIALCOMM_2X_RS232 "9600/6n1/dtr=1/rts=1/flow=0"
#define SERIALCOMM_2X "9600/8n1/dtr=1/rts=1/flow=0"
#define VENDOR_GMC "Gossen Metrawatt"

static const uint32_t scanopts[] = {
	SR_CONF_CONN,
	SR_CONF_SERIALCOMM,
};

static const uint32_t drvopts[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_THERMOMETER, /**< All GMC 1x/2x multimeters seem to support this */
};

/** Hardware capabilities for Metrahit 1x/2x devices in send mode. */
static const uint32_t devopts_sm[] = {
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
};

/** Hardware capabilities for Metrahit 2x devices in bidirectional Mode. */
static const uint32_t devopts_bd[] = {
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_POWER_OFF | SR_CONF_GET | SR_CONF_SET,
};

/* TODO:
 * - For the 29S SR_CONF_ENERGYMETER, too.
 * - SR_CONF_PATTERN_MODE for some 2x devices
 * - SR_CONF_DATALOG for 22M, 26M, 29S and storage adaptors.
 * Need to implement device-specific lists.
 */

/**
 * Read single byte from serial port.
 *
 * @retval -1 Timeout or error.
 * @retval other Byte.
 */
static int read_byte(struct sr_serial_dev_inst *serial, gint64 timeout)
{
	uint8_t result = 0;
	int rc = 0;

	for (;;) {
		rc = serial_read_nonblocking(serial, &result, 1);
		if (rc == 1) {
			sr_spew("read: 0x%02x/%d", result, result);
			return result;
		}
		if (g_get_monotonic_time() > timeout)
			return -1;
		g_usleep(2000);
	}
}

/**
 * Try to detect GMC 1x/2x multimeter model in send mode for max. 1 second.
 *
 * @param serial Configured, open serial port.
 *
 * @retval NULL Detection failed.
 * @retval other Model code.
 */
static enum model scan_model_sm(struct sr_serial_dev_inst *serial)
{
	int byte, bytecnt, cnt;
	enum model model;
	gint64 timeout_us;

	model = METRAHIT_NONE;
	timeout_us = g_get_monotonic_time() + (1 * 1000 * 1000);

	/*
	 * Try to find message consisting of device code and several
	 * (at least 4) data bytes.
	 */
	for (bytecnt = 0; bytecnt < 100; bytecnt++) {
		byte = read_byte(serial, timeout_us);
		if ((byte == -1) || (timeout_us < g_get_monotonic_time()))
			break;
		if ((byte & MSGID_MASK) == MSGID_INF) {
			if (!(model = gmc_decode_model_sm(byte & MSGC_MASK)))
				break;
			/* Now expect (at least) 4 data bytes. */
			for (cnt = 0; cnt < 4; cnt++) {
				byte = read_byte(serial, timeout_us);
				if ((byte == -1) ||
					((byte & MSGID_MASK) != MSGID_DATA))
				{
					model = METRAHIT_NONE;
					bytecnt = 100;
					break;
				}
			}
			break;
		}
	}

	return model;
}

/**
 * Scan for Metrahit 1x and Metrahit 2x in send mode using Gossen Metrawatt
 * 'RS232' interface.
 *
 * The older 1x models use 8192 baud and the newer 2x 9600 baud.
 * The DMM usually sends up to about 20 messages per second. However, depending
 * on configuration and measurement mode the intervals can be much larger and
 * then the detection might not work.
 */
static GSList *scan_1x_2x_rs232(struct sr_dev_driver *di, GSList *options)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	struct sr_config *src;
	struct sr_serial_dev_inst *serial;
	GSList *l, *devices;
	const char *conn, *serialcomm;
	enum model model;
	gboolean serialcomm_given;

	devices = NULL;
	conn = serialcomm = NULL;
	serialcomm_given = FALSE;

	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = g_variant_get_string(src->data, NULL);
			break;
		case SR_CONF_SERIALCOMM:
			serialcomm = g_variant_get_string(src->data, NULL);
			serialcomm_given = TRUE;
			break;
		}
	}
	if (!conn)
		return NULL;
	if (!serialcomm)
		serialcomm = SERIALCOMM_2X_RS232;

	serial = sr_serial_dev_inst_new(conn, serialcomm);

	if (serial_open(serial, SERIAL_RDWR) != SR_OK) {
		sr_serial_dev_inst_free(serial);
		return NULL;
	}

	serial_flush(serial);

	model = scan_model_sm(serial);

	/*
	 * If detection failed and no user-supplied parameters,
	 * try second baud rate.
	 */
	if ((model == METRAHIT_NONE) && !serialcomm_given) {
		serialcomm = SERIALCOMM_1X_RS232;
		g_free(serial->serialcomm);
		serial->serialcomm = g_strdup(serialcomm);
		if (serial_set_paramstr(serial, serialcomm) == SR_OK) {
			serial_flush(serial);
			model = scan_model_sm(serial);
		}
	}

	if (model != METRAHIT_NONE) {
		sr_spew("%s %s detected!", VENDOR_GMC, gmc_model_str(model));
		sdi = g_malloc0(sizeof(struct sr_dev_inst));
		sdi->status = SR_ST_INACTIVE;
		sdi->vendor = g_strdup(VENDOR_GMC);
		sdi->model = g_strdup(gmc_model_str(model));
		devc = g_malloc0(sizeof(struct dev_context));
		sr_sw_limits_init(&devc->limits);
		devc->model = model;
		devc->settings_ok = FALSE;
		sdi->conn = serial;
		sdi->priv = devc;
		sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
		devices = g_slist_append(devices, sdi);
	}

	return std_scan_complete(di, devices);
}

/**
 * Scan for Metrahit 2x in a bidirectional mode using Gossen Metrawatt
 * 'BD 232' interface.
 */
static GSList *scan_2x_bd232(struct sr_dev_driver *di, GSList *options)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	struct sr_config *src;
	struct sr_serial_dev_inst *serial;
	GSList *l, *devices;
	const char *conn, *serialcomm;
	int cnt, byte;
	gint64 timeout_us;

	sdi = NULL;
	devc = NULL;
	conn = serialcomm = NULL;
	devices = NULL;

	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = g_variant_get_string(src->data, NULL);
			break;
		case SR_CONF_SERIALCOMM:
			serialcomm = g_variant_get_string(src->data, NULL);
			break;
		}
	}
	if (!conn)
		return NULL;
	if (!serialcomm)
		serialcomm = SERIALCOMM_2X;

	serial = sr_serial_dev_inst_new(conn, serialcomm);

	if (serial_open(serial, SERIAL_RDWR) != SR_OK)
		goto exit_err;

	devc = g_malloc0(sizeof(struct dev_context));

	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	sdi->status = SR_ST_INACTIVE;
	sdi->vendor = g_strdup(VENDOR_GMC);
	sdi->priv = devc;

	/* Send message 03 "Query multimeter version and status" */
	sdi->conn = serial;
	if (req_stat14(sdi, TRUE) != SR_OK)
		goto exit_err;

	/* Wait for reply from device(s) for up to 2s. */
	timeout_us = g_get_monotonic_time() + (2 * 1000 * 1000);

	while (timeout_us > g_get_monotonic_time()) {
		/* Receive reply (14 bytes) */
		devc->buflen = 0;
		for (cnt = 0; cnt < GMC_REPLY_SIZE; cnt++) {
			byte = read_byte(serial, timeout_us);
			if (byte != -1)
				devc->buf[devc->buflen++] = (byte & MASK_6BITS);
		}

		if (devc->buflen != GMC_REPLY_SIZE)
			continue;

		devc->addr = devc->buf[0];
		process_msg14(sdi);
		devc->buflen = 0;

		if (devc->model != METRAHIT_NONE) {
			sr_spew("%s %s detected!", VENDOR_GMC, gmc_model_str(devc->model));
			sr_sw_limits_init(&devc->limits);
			sdi->model = g_strdup(gmc_model_str(devc->model));
			sdi->version = g_strdup_printf("Firmware %d.%d", devc->fw_ver_maj, devc->fw_ver_min);
			sdi->conn = serial;
			sdi->priv = devc;
			sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
			devices = g_slist_append(devices, sdi);
			devc = g_malloc0(sizeof(struct dev_context));
			sdi = g_malloc0(sizeof(struct sr_dev_inst));
			sdi->status = SR_ST_INACTIVE;
			sdi->vendor = g_strdup(VENDOR_GMC);
		}
	};

	/* Free last alloc if no device found */
	if (devc->model == METRAHIT_NONE) {
		g_free(devc);
		sr_dev_inst_free(sdi);
	}

	return std_scan_complete(di, devices);

exit_err:
	sr_serial_dev_inst_free(serial);
	g_free(devc);
	sr_dev_inst_free(sdi);

	return NULL;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct dev_context *devc;

	devc = sdi->priv;

	devc->model = METRAHIT_NONE;

	return std_serial_dev_close(sdi);
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;

	(void)cg;

	if (!sdi)
		return SR_ERR_ARG;

	devc = sdi->priv;

	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
	case SR_CONF_LIMIT_MSEC:
		return sr_sw_limits_config_get(&devc->limits, key, data);
	case SR_CONF_POWER_OFF:
		*data = g_variant_new_boolean(FALSE);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

/** Implementation of config_list for Metrahit 1x/2x send mode */
static int config_list_sm(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
			  const struct sr_channel_group *cg)
{
	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts_sm);
}

/** Implementation of config_list for Metrahit 2x bidirectional mode */
static int config_list_bd(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
			  const struct sr_channel_group *cg)
{
	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts_bd);
}

static int dev_acquisition_start_1x_2x_rs232(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;

	devc = sdi->priv;
	devc->settings_ok = FALSE;
	devc->buflen = 0;

	sr_sw_limits_acquisition_start(&devc->limits);
	std_session_send_df_header(sdi);

	/* Poll every 40ms, or whenever some data comes in. */
	serial = sdi->conn;
	serial_source_add(sdi->session, serial, G_IO_IN, 40,
			gmc_mh_1x_2x_receive_data, (void *)sdi);

	return SR_OK;
}

static int dev_acquisition_start_2x_bd232(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;

	devc = sdi->priv;
	devc->settings_ok = FALSE;
	devc->buflen = 0;

	sr_sw_limits_acquisition_start(&devc->limits);
	std_session_send_df_header(sdi);

	/* Poll every 40ms, or whenever some data comes in. */
	serial = sdi->conn;
	serial_source_add(sdi->session, serial, G_IO_IN, 40,
			gmc_mh_2x_receive_data, (void *)sdi);

	/* Send start message */
	return req_meas14(sdi);
}

static struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info = {
	.name = "gmc-mh-1x-2x-rs232",
	.longname = "Gossen Metrawatt Metrahit 1x/2x, RS232 interface",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan_1x_2x_rs232,
	.dev_list = std_dev_list,
	.dev_clear = std_dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list_sm,
	.dev_open = std_serial_dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start_1x_2x_rs232,
	.dev_acquisition_stop = std_serial_dev_acquisition_stop,
	.context = NULL,
};
SR_REGISTER_DEV_DRIVER(gmc_mh_1x_2x_rs232_driver_info);

static struct sr_dev_driver gmc_mh_2x_bd232_driver_info = {
	.name = "gmc-mh-2x-bd232",
	.longname = "Gossen Metrawatt Metrahit 2x, BD232/SI232-II interface",
	.api_version = 1,
	.init = std_init,
	.cleanup = std_cleanup,
	.scan = scan_2x_bd232,
	.dev_list = std_dev_list,
	.dev_clear = std_dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list_bd,
	.dev_open = std_serial_dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start_2x_bd232,
	.dev_acquisition_stop = std_serial_dev_acquisition_stop,
	.context = NULL,
};
SR_REGISTER_DEV_DRIVER(gmc_mh_2x_bd232_driver_info);
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013, 2014 Matthias Heidbrink <m-sigrok@heidbrink.biz>
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation, either version 3 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	/**
	21	* @file
	22	*
	23	* Gossen Metrawatt Metrahit 1x/2x drivers
	24	*
	25	* @internal
	26	*/
	27
	28	#include <config.h>
	29	#include <string.h>
	30	#include "protocol.h"
	31
	32	/* Serial communication parameters for Metrahit 1x/2x with 'RS232' adaptor */
	33	#define SERIALCOMM_1X_RS232 "8228/6n1/dtr=1/rts=1/flow=0" /* =8192, closer with divider */
	34	#define SERIALCOMM_2X_RS232 "9600/6n1/dtr=1/rts=1/flow=0"
	35	#define SERIALCOMM_2X "9600/8n1/dtr=1/rts=1/flow=0"
	36	#define VENDOR_GMC "Gossen Metrawatt"
	37
	38	static const uint32_t scanopts[] = {
	39	SR_CONF_CONN,
	40	SR_CONF_SERIALCOMM,
	41	};
	42
	43	static const uint32_t drvopts[] = {
	44	SR_CONF_MULTIMETER,
	45	SR_CONF_THERMOMETER, /*< All GMC 1x/2x multimeters seem to support this /
	46	};
	47
	48	/** Hardware capabilities for Metrahit 1x/2x devices in send mode. */
	49	static const uint32_t devopts_sm[] = {
	50	SR_CONF_CONTINUOUS,
	51	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	52	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	53	};
	54
	55	/** Hardware capabilities for Metrahit 2x devices in bidirectional Mode. */
	56	static const uint32_t devopts_bd[] = {
	57	SR_CONF_CONTINUOUS,
	58	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
	59	SR_CONF_LIMIT_MSEC \| SR_CONF_GET \| SR_CONF_SET,
	60	SR_CONF_POWER_OFF \| SR_CONF_GET \| SR_CONF_SET,
	61	};
	62
	63	/* TODO:
	64	* - For the 29S SR_CONF_ENERGYMETER, too.
	65	* - SR_CONF_PATTERN_MODE for some 2x devices
	66	* - SR_CONF_DATALOG for 22M, 26M, 29S and storage adaptors.
	67	* Need to implement device-specific lists.
	68	*/
	69
	70	/**
	71	* Read single byte from serial port.
	72	*
	73	* @retval -1 Timeout or error.
	74	* @retval other Byte.
	75	*/
	76	static int read_byte(struct sr_serial_dev_inst *serial, gint64 timeout)
	77	{
	78	uint8_t result = 0;
	79	int rc = 0;
	80
	81	for (;;) {
	82	rc = serial_read_nonblocking(serial, &result, 1);
	83	if (rc == 1) {
	84	sr_spew("read: 0x%02x/%d", result, result);
	85	return result;
	86	}
	87	if (g_get_monotonic_time() > timeout)
	88	return -1;
	89	g_usleep(2000);
	90	}
	91	}
	92
	93	/**
	94	* Try to detect GMC 1x/2x multimeter model in send mode for max. 1 second.
	95	*
	96	* @param serial Configured, open serial port.
	97	*
	98	* @retval NULL Detection failed.
	99	* @retval other Model code.
	100	*/
	101	static enum model scan_model_sm(struct sr_serial_dev_inst *serial)
	102	{
	103	int byte, bytecnt, cnt;
	104	enum model model;
	105	gint64 timeout_us;
	106
	107	model = METRAHIT_NONE;
	108	timeout_us = g_get_monotonic_time() + (1 * 1000 * 1000);
	109
	110	/*
	111	* Try to find message consisting of device code and several
	112	* (at least 4) data bytes.
	113	*/
	114	for (bytecnt = 0; bytecnt < 100; bytecnt++) {
	115	byte = read_byte(serial, timeout_us);
	116	if ((byte == -1) \|\| (timeout_us < g_get_monotonic_time()))
	117	break;
	118	if ((byte & MSGID_MASK) == MSGID_INF) {
	119	if (!(model = gmc_decode_model_sm(byte & MSGC_MASK)))
	120	break;
	121	/* Now expect (at least) 4 data bytes. */
	122	for (cnt = 0; cnt < 4; cnt++) {
	123	byte = read_byte(serial, timeout_us);
	124	if ((byte == -1) \|\|
	125	((byte & MSGID_MASK) != MSGID_DATA))
	126	{
	127	model = METRAHIT_NONE;
	128	bytecnt = 100;
	129	break;
	130	}
	131	}
	132	break;
	133	}
	134	}
	135
	136	return model;
	137	}
	138
	139	/**
	140	* Scan for Metrahit 1x and Metrahit 2x in send mode using Gossen Metrawatt
	141	* 'RS232' interface.
	142	*
	143	* The older 1x models use 8192 baud and the newer 2x 9600 baud.
	144	* The DMM usually sends up to about 20 messages per second. However, depending
	145	* on configuration and measurement mode the intervals can be much larger and
	146	* then the detection might not work.
	147	*/
	148	static GSList scan_1x_2x_rs232(struct sr_dev_driver di, GSList *options)
	149	{
	150	struct sr_dev_inst *sdi;
	151	struct dev_context *devc;
	152	struct sr_config *src;
	153	struct sr_serial_dev_inst *serial;
	154	GSList l, devices;
	155	const char conn, serialcomm;
	156	enum model model;
	157	gboolean serialcomm_given;
	158
	159	devices = NULL;
	160	conn = serialcomm = NULL;
	161	serialcomm_given = FALSE;
	162
	163	for (l = options; l; l = l->next) {
	164	src = l->data;
	165	switch (src->key) {
	166	case SR_CONF_CONN:
	167	conn = g_variant_get_string(src->data, NULL);
	168	break;
	169	case SR_CONF_SERIALCOMM:
	170	serialcomm = g_variant_get_string(src->data, NULL);
	171	serialcomm_given = TRUE;
	172	break;
	173	}
	174	}
	175	if (!conn)
	176	return NULL;
	177	if (!serialcomm)
	178	serialcomm = SERIALCOMM_2X_RS232;
	179
	180	serial = sr_serial_dev_inst_new(conn, serialcomm);
	181
	182	if (serial_open(serial, SERIAL_RDWR) != SR_OK) {
	183	sr_serial_dev_inst_free(serial);
	184	return NULL;
	185	}
	186
	187	serial_flush(serial);
	188
	189	model = scan_model_sm(serial);
	190
	191	/*
	192	* If detection failed and no user-supplied parameters,
	193	* try second baud rate.
	194	*/
	195	if ((model == METRAHIT_NONE) && !serialcomm_given) {
	196	serialcomm = SERIALCOMM_1X_RS232;
	197	g_free(serial->serialcomm);
	198	serial->serialcomm = g_strdup(serialcomm);
	199	if (serial_set_paramstr(serial, serialcomm) == SR_OK) {
	200	serial_flush(serial);
	201	model = scan_model_sm(serial);
	202	}
	203	}
	204
	205	if (model != METRAHIT_NONE) {
	206	sr_spew("%s %s detected!", VENDOR_GMC, gmc_model_str(model));
	207	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	208	sdi->status = SR_ST_INACTIVE;
	209	sdi->vendor = g_strdup(VENDOR_GMC);
	210	sdi->model = g_strdup(gmc_model_str(model));
	211	devc = g_malloc0(sizeof(struct dev_context));
	212	sr_sw_limits_init(&devc->limits);
	213	devc->model = model;
	214	devc->settings_ok = FALSE;
	215	sdi->conn = serial;
	216	sdi->priv = devc;
	217	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
	218	devices = g_slist_append(devices, sdi);
	219	}
	220
	221	return std_scan_complete(di, devices);
	222	}
	223
	224	/**
	225	* Scan for Metrahit 2x in a bidirectional mode using Gossen Metrawatt
	226	* 'BD 232' interface.
	227	*/
	228	static GSList scan_2x_bd232(struct sr_dev_driver di, GSList *options)
	229	{
	230	struct sr_dev_inst *sdi;
	231	struct dev_context *devc;
	232	struct sr_config *src;
	233	struct sr_serial_dev_inst *serial;
	234	GSList l, devices;
	235	const char conn, serialcomm;
	236	int cnt, byte;
	237	gint64 timeout_us;
	238
	239	sdi = NULL;
	240	devc = NULL;
	241	conn = serialcomm = NULL;
	242	devices = NULL;
	243
	244	for (l = options; l; l = l->next) {
	245	src = l->data;
	246	switch (src->key) {
	247	case SR_CONF_CONN:
	248	conn = g_variant_get_string(src->data, NULL);
	249	break;
	250	case SR_CONF_SERIALCOMM:
	251	serialcomm = g_variant_get_string(src->data, NULL);
	252	break;
	253	}
	254	}
	255	if (!conn)
	256	return NULL;
	257	if (!serialcomm)
	258	serialcomm = SERIALCOMM_2X;
	259
	260	serial = sr_serial_dev_inst_new(conn, serialcomm);
	261
	262	if (serial_open(serial, SERIAL_RDWR) != SR_OK)
	263	goto exit_err;
	264
	265	devc = g_malloc0(sizeof(struct dev_context));
	266
	267	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	268	sdi->status = SR_ST_INACTIVE;
	269	sdi->vendor = g_strdup(VENDOR_GMC);
	270	sdi->priv = devc;
	271
	272	/* Send message 03 "Query multimeter version and status" */
	273	sdi->conn = serial;
	274	if (req_stat14(sdi, TRUE) != SR_OK)
	275	goto exit_err;
	276
	277	/* Wait for reply from device(s) for up to 2s. */
	278	timeout_us = g_get_monotonic_time() + (2 * 1000 * 1000);
	279
	280	while (timeout_us > g_get_monotonic_time()) {
	281	/* Receive reply (14 bytes) */
	282	devc->buflen = 0;
	283	for (cnt = 0; cnt < GMC_REPLY_SIZE; cnt++) {
	284	byte = read_byte(serial, timeout_us);
	285	if (byte != -1)
	286	devc->buf[devc->buflen++] = (byte & MASK_6BITS);
	287	}
	288
	289	if (devc->buflen != GMC_REPLY_SIZE)
	290	continue;
	291
	292	devc->addr = devc->buf[0];
	293	process_msg14(sdi);
	294	devc->buflen = 0;
	295
	296	if (devc->model != METRAHIT_NONE) {
	297	sr_spew("%s %s detected!", VENDOR_GMC, gmc_model_str(devc->model));
	298	sr_sw_limits_init(&devc->limits);
	299	sdi->model = g_strdup(gmc_model_str(devc->model));
	300	sdi->version = g_strdup_printf("Firmware %d.%d", devc->fw_ver_maj, devc->fw_ver_min);
	301	sdi->conn = serial;
	302	sdi->priv = devc;
	303	sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
	304	devices = g_slist_append(devices, sdi);
	305	devc = g_malloc0(sizeof(struct dev_context));
	306	sdi = g_malloc0(sizeof(struct sr_dev_inst));
	307	sdi->status = SR_ST_INACTIVE;
	308	sdi->vendor = g_strdup(VENDOR_GMC);
	309	}
	310	};
	311
	312	/* Free last alloc if no device found */
	313	if (devc->model == METRAHIT_NONE) {
	314	g_free(devc);
	315	sr_dev_inst_free(sdi);
	316	}
	317
	318	return std_scan_complete(di, devices);
	319
	320	exit_err:
	321	sr_serial_dev_inst_free(serial);
	322	g_free(devc);
	323	sr_dev_inst_free(sdi);
	324
	325	return NULL;
	326	}
	327
	328	static int dev_close(struct sr_dev_inst *sdi)
	329	{
	330	struct dev_context *devc;
	331
	332	devc = sdi->priv;
	333
	334	devc->model = METRAHIT_NONE;
	335
	336	return std_serial_dev_close(sdi);
	337	}
	338
	339	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	340	const struct sr_channel_group *cg)
	341	{
	342	struct dev_context *devc;
	343
	344	(void)cg;
	345
	346	if (!sdi)
	347	return SR_ERR_ARG;
	348
	349	devc = sdi->priv;
	350
	351	switch (key) {
	352	case SR_CONF_LIMIT_SAMPLES:
	353	case SR_CONF_LIMIT_MSEC:
	354	return sr_sw_limits_config_get(&devc->limits, key, data);
	355	case SR_CONF_POWER_OFF:
	356	*data = g_variant_new_boolean(FALSE);
	357	break;
	358	default:
	359	return SR_ERR_NA;
	360	}
	361
	362	return SR_OK;
	363	}
	364
	365	/** Implementation of config_list for Metrahit 1x/2x send mode */
	366	static int config_list_sm(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	367	const struct sr_channel_group *cg)
	368	{
	369	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts_sm);
	370	}
	371
	372	/** Implementation of config_list for Metrahit 2x bidirectional mode */
	373	static int config_list_bd(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
	374	const struct sr_channel_group *cg)
	375	{
	376	return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts_bd);
	377	}
	378
	379	static int dev_acquisition_start_1x_2x_rs232(const struct sr_dev_inst *sdi)
	380	{
	381	struct dev_context *devc;
	382	struct sr_serial_dev_inst *serial;
	383
	384	devc = sdi->priv;
	385	devc->settings_ok = FALSE;
	386	devc->buflen = 0;
	387
	388	sr_sw_limits_acquisition_start(&devc->limits);
	389	std_session_send_df_header(sdi);
	390
	391	/* Poll every 40ms, or whenever some data comes in. */
	392	serial = sdi->conn;
	393	serial_source_add(sdi->session, serial, G_IO_IN, 40,
	394	gmc_mh_1x_2x_receive_data, (void *)sdi);
	395
	396	return SR_OK;
	397	}
	398
	399	static int dev_acquisition_start_2x_bd232(const struct sr_dev_inst *sdi)
	400	{
	401	struct dev_context *devc;
	402	struct sr_serial_dev_inst *serial;
	403
	404	devc = sdi->priv;
	405	devc->settings_ok = FALSE;
	406	devc->buflen = 0;
	407
	408	sr_sw_limits_acquisition_start(&devc->limits);
	409	std_session_send_df_header(sdi);
	410
	411	/* Poll every 40ms, or whenever some data comes in. */
	412	serial = sdi->conn;
	413	serial_source_add(sdi->session, serial, G_IO_IN, 40,
	414	gmc_mh_2x_receive_data, (void *)sdi);
	415
	416	/* Send start message */
	417	return req_meas14(sdi);
	418	}
	419
	420	static struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info = {
	421	.name = "gmc-mh-1x-2x-rs232",
	422	.longname = "Gossen Metrawatt Metrahit 1x/2x, RS232 interface",
	423	.api_version = 1,
	424	.init = std_init,
	425	.cleanup = std_cleanup,
	426	.scan = scan_1x_2x_rs232,
	427	.dev_list = std_dev_list,
	428	.dev_clear = std_dev_clear,
	429	.config_get = config_get,
	430	.config_set = config_set,
	431	.config_list = config_list_sm,
	432	.dev_open = std_serial_dev_open,
	433	.dev_close = dev_close,
	434	.dev_acquisition_start = dev_acquisition_start_1x_2x_rs232,
	435	.dev_acquisition_stop = std_serial_dev_acquisition_stop,
	436	.context = NULL,
	437	};
	438	SR_REGISTER_DEV_DRIVER(gmc_mh_1x_2x_rs232_driver_info);
	439
	440	static struct sr_dev_driver gmc_mh_2x_bd232_driver_info = {
	441	.name = "gmc-mh-2x-bd232",
	442	.longname = "Gossen Metrawatt Metrahit 2x, BD232/SI232-II interface",
	443	.api_version = 1,
	444	.init = std_init,
	445	.cleanup = std_cleanup,
	446	.scan = scan_2x_bd232,
	447	.dev_list = std_dev_list,
	448	.dev_clear = std_dev_clear,
	449	.config_get = config_get,
	450	.config_set = config_set,
	451	.config_list = config_list_bd,
	452	.dev_open = std_serial_dev_open,
	453	.dev_close = dev_close,
	454	.dev_acquisition_start = dev_acquisition_start_2x_bd232,
	455	.dev_acquisition_stop = std_serial_dev_acquisition_stop,
	456	.context = NULL,
	457	};
	458	SR_REGISTER_DEV_DRIVER(gmc_mh_2x_bd232_driver_info);