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

/*
 * 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/>.
 */

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

#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"

SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info;

static const int32_t hwopts[] = {
	SR_CONF_CONN,
	SR_CONF_SERIALCOMM,
};

static const int32_t hwcaps[] = {
	SR_CONF_MULTIMETER,
	SR_CONF_THERMOMETER,    /**< All GMC 1x/2x multimeters seem to support this */
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_LIMIT_MSEC,
	SR_CONF_CONTINUOUS,
};

/* 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.
 */

/** Init driver gmc_mh_1x_2x_rs232. */
static int init(struct sr_context *sr_ctx)
{
    return std_init(sr_ctx, &gmc_mh_1x_2x_rs232_driver_info, LOG_PREFIX);
}

/**
 * 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(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(GSList *options)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_config *src;
	struct sr_probe *probe;
	struct sr_serial_dev_inst *serial;
	GSList *l, *devices;
	const char *conn, *serialcomm;
	enum model model;
	gboolean serialcomm_given;

	devices = NULL;
	drvc = (&gmc_mh_1x_2x_rs232_driver_info)->priv;
	drvc->instances = NULL;
	conn = serialcomm = NULL;
	model = METRAHIT_NONE;
	serialcomm_given = FALSE;

	sr_spew("scan() called!");

	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;

	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
		return NULL;

	if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != 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));
		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR_GMC,
				gmc_model_str(model), "")))
			return NULL;
		if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
			sr_err("Device context malloc failed.");
			return NULL;
		}
		devc->model = model;
		devc->limit_samples = 0;
		devc->limit_msec = 0;
		devc->num_samples = 0;
		devc->elapsed_msec = g_timer_new();
		devc->settings_ok = FALSE;

		sdi->conn = serial;
		sdi->priv = devc;
		sdi->driver = &gmc_mh_1x_2x_rs232_driver_info;
		if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
			return NULL;
		sdi->probes = g_slist_append(sdi->probes, probe);
		drvc->instances = g_slist_append(drvc->instances, sdi);
		devices = g_slist_append(devices, sdi);
	}

	return devices;
}

static GSList *dev_list(void)
{
   return ((struct drv_context *)(gmc_mh_1x_2x_rs232_driver_info.priv))->instances;
}

static int dev_clear(void)
{
	return std_dev_clear(&gmc_mh_1x_2x_rs232_driver_info, NULL);
}

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

	std_serial_dev_close(sdi);

	sdi->status = SR_ST_INACTIVE;

	/* Free dynamically allocated resources. */
	if ((devc = sdi->priv) && devc->elapsed_msec) {
		g_timer_destroy(devc->elapsed_msec);
		devc->elapsed_msec = NULL;
		devc->model = METRAHIT_NONE;
	}

	return SR_OK;
}

static int cleanup(void)
{
	return dev_clear();
}

/** Get value of configuration item */
static int config_get(int key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_probe_group *probe_group)
{
	int ret;
	ret = SR_OK;
	struct dev_context *devc;

	(void)probe_group;

	if (!sdi || !(devc = sdi->priv))
		return SR_ERR_ARG;

	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	case SR_CONF_LIMIT_MSEC:
		*data = g_variant_new_uint64(devc->limit_msec);
		break;
	default:
		return SR_ERR_NA;
	}

	return ret;
}

static int config_set(int key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_probe_group *probe_group)
{
	struct dev_context *devc;

	(void)probe_group;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	if (!(devc = sdi->priv)) {
		sr_err("sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	switch (key) {
	case SR_CONF_LIMIT_MSEC:
		if (g_variant_get_uint64(data) == 0) {
			sr_err("LIMIT_MSEC can't be 0.");
			return SR_ERR;
		}
		devc->limit_msec = g_variant_get_uint64(data);
		sr_dbg("Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_probe_group *probe_group)
{
	(void)sdi;
	(void)probe_group;

	switch (key) {
	case SR_CONF_SCAN_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
		break;
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc;
	struct sr_serial_dev_inst *serial;

	if (!sdi || !cb_data || !(devc = sdi->priv))
		return SR_ERR_BUG;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	devc->cb_data = cb_data;
	devc->settings_ok = FALSE;
	devc->buflen = 0;

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, LOG_PREFIX);

	/* Start timer, if required. */
	if (devc->limit_msec)
		g_timer_start(devc->elapsed_msec);

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

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct dev_context *devc;

	/* Stop timer, if required. */
	if (sdi && (devc = sdi->priv) && devc->limit_msec)
		g_timer_stop(devc->elapsed_msec);

	return std_serial_dev_acquisition_stop(sdi, cb_data, dev_close,
			sdi->conn, LOG_PREFIX);
}

SR_PRIV 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 = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = dev_clear,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = std_serial_dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 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	/** @file
	21	* Gossen Metrawatt Metrahit 1x/2x drivers
	22	* @private
	23	*/
	24
	25	#include <string.h>
	26	#include "protocol.h"
	27
	28	/* Serial communication parameters for Metrahit 1x/2x with 'RS232' adaptor */
	29	#define SERIALCOMM_1X_RS232 "8228/6n1/dtr=1/rts=1/flow=0" /* =8192, closer with divider */
	30	#define SERIALCOMM_2X_RS232 "9600/6n1/dtr=1/rts=1/flow=0"
	31	#define SERIALCOMM_2X "9600/8n1/dtr=1/rts=1/flow=0"
	32	#define VENDOR_GMC "Gossen Metrawatt"
	33
	34	SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info;
	35
	36	static const int32_t hwopts[] = {
	37	SR_CONF_CONN,
	38	SR_CONF_SERIALCOMM,
	39	};
	40
	41	static const int32_t hwcaps[] = {
	42	SR_CONF_MULTIMETER,
	43	SR_CONF_THERMOMETER, /*< All GMC 1x/2x multimeters seem to support this /
	44	SR_CONF_LIMIT_SAMPLES,
	45	SR_CONF_LIMIT_MSEC,
	46	SR_CONF_CONTINUOUS,
	47	};
	48
	49	/* TODO:
	50	* - For the 29S SR_CONF_ENERGYMETER, too.
	51	* - SR_CONF_PATTERN_MODE for some 2x devices
	52	* - SR_CONF_DATALOG for 22M, 26M, 29S and storage adaptors.
	53	* Need to implement device-specific lists.
	54	*/
	55
	56	/** Init driver gmc_mh_1x_2x_rs232. */
	57	static int init(struct sr_context *sr_ctx)
	58	{
	59	return std_init(sr_ctx, &gmc_mh_1x_2x_rs232_driver_info, LOG_PREFIX);
	60	}
	61
	62	/**
	63	* Read single byte from serial port.
	64	*
	65	* @retval -1 Timeout or error.
	66	* @retval other Byte.
	67	*/
	68	static int read_byte(struct sr_serial_dev_inst *serial, gint64 timeout)
	69	{
	70	uint8_t result = 0;
	71	int rc = 0;
	72
	73	for (;;) {
	74	rc = serial_read(serial, &result, 1);
	75	if (rc == 1) {
	76	sr_spew("read: 0x%02x/%d", result, result);
	77	return result;
	78	}
	79	if (g_get_monotonic_time() > timeout)
	80	return -1;
	81	g_usleep(2000);
	82	}
	83	}
	84
	85	/**
	86	* Try to detect GMC 1x/2x multimeter model in send mode for max. 1 second.
	87	*
	88	* @param serial Configured, open serial port.
	89	*
	90	* @retval NULL Detection failed.
	91	* @retval other Model code.
	92	*/
	93	static enum model scan_model_sm(struct sr_serial_dev_inst *serial)
	94	{
	95	int byte, bytecnt, cnt;
	96	enum model model;
	97	gint64 timeout_us;
	98
	99	model = METRAHIT_NONE;
	100	timeout_us = g_get_monotonic_time() + 1 * 1000 * 1000;
	101
	102	/*
	103	* Try to find message consisting of device code and several
	104	* (at least 4) data bytes.
	105	*/
	106	for (bytecnt = 0; bytecnt < 100; bytecnt++) {
	107	byte = read_byte(serial, timeout_us);
	108	if ((byte == -1) \|\| (timeout_us < g_get_monotonic_time()))
	109	break;
	110	if ((byte & MSGID_MASK) == MSGID_INF) {
	111	if (!(model = gmc_decode_model_sm(byte & MSGC_MASK)))
	112	break;
	113	/* Now expect (at least) 4 data bytes. */
	114	for (cnt = 0; cnt < 4; cnt++) {
	115	byte = read_byte(serial, timeout_us);
	116	if ((byte == -1) \|\|
	117	((byte & MSGID_MASK) != MSGID_DATA))
	118	{
	119	model = METRAHIT_NONE;
	120	bytecnt = 100;
	121	break;
	122	}
	123	}
	124	break;
	125	}
	126	}
	127
	128	return model;
	129	}
	130
	131	/**
	132	* Scan for Metrahit 1x and Metrahit 2x in send mode using Gossen Metrawatt
	133	* 'RS232' interface.
	134	*
	135	* The older 1x models use 8192 baud and the newer 2x 9600 baud.
	136	* The DMM usually sends up to about 20 messages per second. However, depending
	137	* on configuration and measurement mode the intervals can be much larger and
	138	* then the detection might not work.
	139	*/
	140	static GSList scan(GSList options)
	141	{
	142	struct sr_dev_inst *sdi;
	143	struct drv_context *drvc;
	144	struct dev_context *devc;
	145	struct sr_config *src;
	146	struct sr_probe *probe;
	147	struct sr_serial_dev_inst *serial;
	148	GSList l, devices;
	149	const char conn, serialcomm;
	150	enum model model;
	151	gboolean serialcomm_given;
	152
	153	devices = NULL;
	154	drvc = (&gmc_mh_1x_2x_rs232_driver_info)->priv;
	155	drvc->instances = NULL;
	156	conn = serialcomm = NULL;
	157	model = METRAHIT_NONE;
	158	serialcomm_given = FALSE;
	159
	160	sr_spew("scan() called!");
	161
	162	for (l = options; l; l = l->next) {
	163	src = l->data;
	164	switch (src->key) {
	165	case SR_CONF_CONN:
	166	conn = g_variant_get_string(src->data, NULL);
	167	break;
	168	case SR_CONF_SERIALCOMM:
	169	serialcomm = g_variant_get_string(src->data, NULL);
	170	serialcomm_given = TRUE;
	171	break;
	172	}
	173	}
	174	if (!conn)
	175	return NULL;
	176	if (!serialcomm)
	177	serialcomm = SERIALCOMM_2X_RS232;
	178
	179	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
	180	return NULL;
	181
	182	if (serial_open(serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != 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	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR_GMC,
	208	gmc_model_str(model), "")))
	209	return NULL;
	210	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	211	sr_err("Device context malloc failed.");
	212	return NULL;
	213	}
	214	devc->model = model;
	215	devc->limit_samples = 0;
	216	devc->limit_msec = 0;
	217	devc->num_samples = 0;
	218	devc->elapsed_msec = g_timer_new();
	219	devc->settings_ok = FALSE;
	220
	221	sdi->conn = serial;
	222	sdi->priv = devc;
	223	sdi->driver = &gmc_mh_1x_2x_rs232_driver_info;
	224	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	225	return NULL;
	226	sdi->probes = g_slist_append(sdi->probes, probe);
	227	drvc->instances = g_slist_append(drvc->instances, sdi);
	228	devices = g_slist_append(devices, sdi);
	229	}
	230
	231	return devices;
	232	}
	233
	234	static GSList *dev_list(void)
	235	{
	236	return ((struct drv_context *)(gmc_mh_1x_2x_rs232_driver_info.priv))->instances;
	237	}
	238
	239	static int dev_clear(void)
	240	{
	241	return std_dev_clear(&gmc_mh_1x_2x_rs232_driver_info, NULL);
	242	}
	243
	244	static int dev_close(struct sr_dev_inst *sdi)
	245	{
	246	struct dev_context *devc;
	247
	248	std_serial_dev_close(sdi);
	249
	250	sdi->status = SR_ST_INACTIVE;
	251
	252	/* Free dynamically allocated resources. */
	253	if ((devc = sdi->priv) && devc->elapsed_msec) {
	254	g_timer_destroy(devc->elapsed_msec);
	255	devc->elapsed_msec = NULL;
	256	devc->model = METRAHIT_NONE;
	257	}
	258
	259	return SR_OK;
	260	}
	261
	262	static int cleanup(void)
	263	{
	264	return dev_clear();
	265	}
	266
	267	/** Get value of configuration item */
	268	static int config_get(int key, GVariant *data, const struct sr_dev_inst sdi,
	269	const struct sr_probe_group *probe_group)
	270	{
	271	int ret;
	272	ret = SR_OK;
	273	struct dev_context *devc;
	274
	275	(void)probe_group;
	276
	277	if (!sdi \|\| !(devc = sdi->priv))
	278	return SR_ERR_ARG;
	279
	280	ret = SR_OK;
	281	switch (key) {
	282	case SR_CONF_LIMIT_SAMPLES:
	283	*data = g_variant_new_uint64(devc->limit_samples);
	284	break;
	285	case SR_CONF_LIMIT_MSEC:
	286	*data = g_variant_new_uint64(devc->limit_msec);
	287	break;
	288	default:
	289	return SR_ERR_NA;
	290	}
	291
	292	return ret;
	293	}
	294
	295	static int config_set(int key, GVariant data, const struct sr_dev_inst sdi,
	296	const struct sr_probe_group *probe_group)
	297	{
	298	struct dev_context *devc;
	299
	300	(void)probe_group;
	301
	302	if (sdi->status != SR_ST_ACTIVE)
	303	return SR_ERR_DEV_CLOSED;
	304
	305	if (!(devc = sdi->priv)) {
	306	sr_err("sdi->priv was NULL.");
	307	return SR_ERR_BUG;
	308	}
	309
	310	switch (key) {
	311	case SR_CONF_LIMIT_MSEC:
	312	if (g_variant_get_uint64(data) == 0) {
	313	sr_err("LIMIT_MSEC can't be 0.");
	314	return SR_ERR;
	315	}
	316	devc->limit_msec = g_variant_get_uint64(data);
	317	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	318	devc->limit_msec);
	319	break;
	320	case SR_CONF_LIMIT_SAMPLES:
	321	devc->limit_samples = g_variant_get_uint64(data);
	322	sr_dbg("Setting sample limit to %" PRIu64 ".",
	323	devc->limit_samples);
	324	break;
	325	default:
	326	return SR_ERR_NA;
	327	}
	328
	329	return SR_OK;
	330	}
	331
	332	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi,
	333	const struct sr_probe_group *probe_group)
	334	{
	335	(void)sdi;
	336	(void)probe_group;
	337
	338	switch (key) {
	339	case SR_CONF_SCAN_OPTIONS:
	340	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	341	hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
	342	break;
	343	case SR_CONF_DEVICE_OPTIONS:
	344	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	345	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
	346	break;
	347	default:
	348	return SR_ERR_NA;
	349	}
	350
	351	return SR_OK;
	352	}
	353
	354	static int dev_acquisition_start(const struct sr_dev_inst sdi, void cb_data)
	355	{
	356	struct dev_context *devc;
	357	struct sr_serial_dev_inst *serial;
	358
	359	if (!sdi \|\| !cb_data \|\| !(devc = sdi->priv))
	360	return SR_ERR_BUG;
	361
	362	if (sdi->status != SR_ST_ACTIVE)
	363	return SR_ERR_DEV_CLOSED;
	364
	365	devc->cb_data = cb_data;
	366	devc->settings_ok = FALSE;
	367	devc->buflen = 0;
	368
	369	/* Send header packet to the session bus. */
	370	std_session_send_df_header(cb_data, LOG_PREFIX);
	371
	372	/* Start timer, if required. */
	373	if (devc->limit_msec)
	374	g_timer_start(devc->elapsed_msec);
	375
	376	/* Poll every 40ms, or whenever some data comes in. */
	377	serial = sdi->conn;
	378	serial_source_add(serial, G_IO_IN, 40, gmc_mh_1x_2x_receive_data,
	379	(void *)sdi);
	380
	381	return SR_OK;
	382	}
	383
	384	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	385	{
	386	struct dev_context *devc;
	387
	388	/* Stop timer, if required. */
	389	if (sdi && (devc = sdi->priv) && devc->limit_msec)
	390	g_timer_stop(devc->elapsed_msec);
	391
	392	return std_serial_dev_acquisition_stop(sdi, cb_data, dev_close,
	393	sdi->conn, LOG_PREFIX);
	394	}
	395
	396	SR_PRIV struct sr_dev_driver gmc_mh_1x_2x_rs232_driver_info = {
	397	.name = "gmc-mh-1x-2x-rs232",
	398	.longname = "Gossen Metrawatt Metrahit 1x/2x, 'RS232' interface",
	399	.api_version = 1,
	400	.init = init,
	401	.cleanup = cleanup,
	402	.scan = scan,
	403	.dev_list = dev_list,
	404	.dev_clear = dev_clear,
	405	.config_get = config_get,
	406	.config_set = config_set,
	407	.config_list = config_list,
	408	.dev_open = std_serial_dev_open,
	409	.dev_close = dev_close,
	410	.dev_acquisition_start = dev_acquisition_start,
	411	.dev_acquisition_stop = dev_acquisition_stop,
	412	.priv = NULL,
	413	};