[libsigrok.git] / hardware / fluke-dmm / api.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 *
 * 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/>.
 */

#include <glib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "fluke-dmm.h"

static const int hwopts[] = {
	SR_HWOPT_CONN,
	SR_HWOPT_SERIALCOMM,
	0,
};

static const int hwcaps[] = {
	SR_HWCAP_MULTIMETER,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_CONTINUOUS,
	0,
};

static const char *probe_names[] = {
	"Probe",
	NULL,
};

SR_PRIV struct sr_dev_driver flukedmm_driver_info;
static struct sr_dev_driver *di = &flukedmm_driver_info;

static char *scan_conn[] = {
	/* 287/289 */
	"115200/8n1",
	/* 187/189 */
	"9600/8n1",
	/* Scopemeter 190 series */
	"1200/8n1",
	NULL
};

static const struct flukedmm_profile supported_flukedmm[] = {
	{ FLUKE_187, "187", 100, 1000 },
	{ FLUKE_287, "287", 100, 1000 },
	{ FLUKE_190, "199B", 1000, 3500 },
};


/* Properly close and free all devices. */
static int clear_instances(void)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	GSList *l;

	if (!(drvc = di->priv))
		return SR_OK;

	drvc = di->priv;
	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data))
			continue;
		if (!(devc = sdi->priv))
			continue;
		sr_serial_dev_inst_free(devc->serial);
		sr_dev_inst_free(sdi);
	}
	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return SR_OK;
}

static int hw_init(struct sr_context *sr_ctx)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}

	drvc->sr_ctx = sr_ctx;
	di->priv = drvc;

	return SR_OK;
}

static GSList *fluke_scan(const char *conn, const char *serialcomm)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_probe *probe;
	struct sr_serial_dev_inst *serial;
	GSList *devices;
	int retry, len, i, s;
	char buf[128], *b, **tokens;

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

	if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
		return NULL;

	drvc = di->priv;
	b = buf;
	retry = 0;
	devices = NULL;
	/* We'll try the discovery sequence three times in case the device
	 * is not in an idle state when we send ID. */
	while (!devices && retry < 3) {
		retry++;
		serial_flush(serial);
		if (serial_write(serial, "ID\r", 3) == -1) {
			sr_err("Unable to send ID string: %s.",
			       strerror(errno));
			continue;
		}

		/* Response is first a CMD_ACK byte (ASCII '0' for OK,
		 * or '1' to signify an error. */
		len = 128;
		serial_readline(serial, &b, &len, 150);
		if (len != 1)
			continue;
		if (buf[0] != '0')
			continue;

		/* If CMD_ACK was OK, ID string follows. */
		len = 128;
		serial_readline(serial, &b, &len, 850);
		if (len < 10)
			continue;
		if (strcspn(buf, ",") < 15)
			/* Looks like it's comma-separated. */
			tokens = g_strsplit(buf, ",", 3);
		else
			/* Fluke 199B, at least, uses semicolon. */
			tokens = g_strsplit(buf, ";", 3);
		if (!strncmp("FLUKE", tokens[0], 5)
				&& tokens[1] && tokens[2]) {
			for (i = 0; supported_flukedmm[i].model; i++) {
				if (strcmp(supported_flukedmm[i].modelname, tokens[0] + 6))
					continue;
				/* Skip leading spaces in version number. */
				for (s = 0; tokens[1][s] == ' '; s++);
				if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Fluke",
						tokens[0] + 6, tokens[1] + s)))
					return NULL;
				if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
					sr_err("Device context malloc failed.");
					return NULL;
				}
				devc->profile = &supported_flukedmm[i];
				devc->serial = serial;
				sdi->priv = devc;
				sdi->driver = di;
				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);
				break;
			}
		}
		g_strfreev(tokens);
		if (devices)
			/* Found one. */
			break;
	}
	serial_close(serial);
	if (!devices)
		sr_serial_dev_inst_free(serial);

	return devices;
}

static GSList *hw_scan(GSList *options)
{
	struct sr_hwopt *opt;
	GSList *l, *devices;
	int i;
	const char *conn, *serialcomm;

	conn = serialcomm = NULL;
	for (l = options; l; l = l->next) {
		opt = l->data;
		switch (opt->hwopt) {
		case SR_HWOPT_CONN:
			conn = opt->value;
			break;
		case SR_HWOPT_SERIALCOMM:
			serialcomm = opt->value;
			break;
		}
	}
	if (!conn)
		return NULL;

	if (serialcomm) {
		/* Use the provided comm specs. */
		devices = fluke_scan(conn, serialcomm);
	} else {
		for (i = 0; scan_conn[i]; i++) {
			if ((devices = fluke_scan(conn, scan_conn[i])))
				break;
			/* The Scopemeter 199B, at least, requires this
			 * after all the 115k/9.6k confusion. */
			g_usleep(5000);
		}
	}

	return devices;
}

static GSList *hw_dev_list(void)
{
	struct drv_context *drvc;

	drvc = di->priv;

	return drvc->instances;
}

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

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

	if (serial_open(devc->serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
		return SR_ERR;

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

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

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

	if (devc->serial && devc->serial->fd != -1) {
		serial_close(devc->serial);
		sdi->status = SR_ST_INACTIVE;
	}

	return SR_OK;
}

static int hw_cleanup(void)
{

	clear_instances();

	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
       const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (info_id) {
	case SR_DI_HWOPTS:
		*data = hwopts;
		break;
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_NUM_PROBES:
		*data = GINT_TO_POINTER(1);
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
		const void *value)
{
	struct dev_context *devc;

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

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

	switch (hwcap) {
	case SR_HWCAP_LIMIT_MSEC:
		/* TODO: not yet implemented */
		if (*(const uint64_t *)value == 0) {
			sr_err("LIMIT_MSEC can't be 0.");
			return SR_ERR;
		}
		devc->limit_msec = *(const uint64_t *)value;
		sr_dbg("Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	case SR_HWCAP_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("Unknown capability: %d.", hwcap);
		return SR_ERR;
		break;
	}

	return SR_OK;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_analog meta;
	struct dev_context *devc;

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

	sr_dbg("Starting acquisition.");

	devc->cb_data = cb_data;

	/* Send header packet to the session bus. */
	sr_dbg("Sending SR_DF_HEADER.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(devc->cb_data, &packet);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	sr_dbg("Sending SR_DF_META_ANALOG.");
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = 1;
	sr_session_send(devc->cb_data, &packet);

	/* Poll every 100ms, or whenever some data comes in. */
	sr_source_add(devc->serial->fd, G_IO_IN, 50, fluke_receive_data, (void *)sdi);

	if (serial_write(devc->serial, "QM\r", 3) == -1) {
		sr_err("Unable to send QM: %s.", strerror(errno));
		return SR_ERR;
	}
	devc->cmd_sent_at = g_get_monotonic_time() / 1000;
	devc->expect_response = TRUE;

	return SR_OK;
}

static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

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

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

	sr_dbg("Stopping acquisition.");

	sr_source_remove(devc->serial->fd);
	hw_dev_close((struct sr_dev_inst *)sdi);

	/* Send end packet to the session bus. */
	sr_dbg("Sending SR_DF_END.");
	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver flukedmm_driver_info = {
	.name = "fluke-dmm",
	.longname = "Fluke 18x/28x series DMMs",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	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	#include <glib.h>
	21	#include <sys/types.h>
	22	#include <sys/stat.h>
	23	#include <fcntl.h>
	24	#include <string.h>
	25	#include <errno.h>
	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28	#include "fluke-dmm.h"
	29
	30	static const int hwopts[] = {
	31	SR_HWOPT_CONN,
	32	SR_HWOPT_SERIALCOMM,
	33	0,
	34	};
	35
	36	static const int hwcaps[] = {
	37	SR_HWCAP_MULTIMETER,
	38	SR_HWCAP_LIMIT_SAMPLES,
	39	SR_HWCAP_LIMIT_MSEC,
	40	SR_HWCAP_CONTINUOUS,
	41	0,
	42	};
	43
	44	static const char *probe_names[] = {
	45	"Probe",
	46	NULL,
	47	};
	48
	49	SR_PRIV struct sr_dev_driver flukedmm_driver_info;
	50	static struct sr_dev_driver *di = &flukedmm_driver_info;
	51
	52	static char *scan_conn[] = {
	53	/* 287/289 */
	54	"115200/8n1",
	55	/* 187/189 */
	56	"9600/8n1",
	57	/* Scopemeter 190 series */
	58	"1200/8n1",
	59	NULL
	60	};
	61
	62	static const struct flukedmm_profile supported_flukedmm[] = {
	63	{ FLUKE_187, "187", 100, 1000 },
	64	{ FLUKE_287, "287", 100, 1000 },
	65	{ FLUKE_190, "199B", 1000, 3500 },
	66	};
	67
	68
	69	/* Properly close and free all devices. */
	70	static int clear_instances(void)
	71	{
	72	struct sr_dev_inst *sdi;
	73	struct drv_context *drvc;
	74	struct dev_context *devc;
	75	GSList *l;
	76
	77	if (!(drvc = di->priv))
	78	return SR_OK;
	79
	80	drvc = di->priv;
	81	for (l = drvc->instances; l; l = l->next) {
	82	if (!(sdi = l->data))
	83	continue;
	84	if (!(devc = sdi->priv))
	85	continue;
	86	sr_serial_dev_inst_free(devc->serial);
	87	sr_dev_inst_free(sdi);
	88	}
	89	g_slist_free(drvc->instances);
	90	drvc->instances = NULL;
	91
	92	return SR_OK;
	93	}
	94
	95	static int hw_init(struct sr_context *sr_ctx)
	96	{
	97	struct drv_context *drvc;
	98
	99	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	100	sr_err("Driver context malloc failed.");
	101	return SR_ERR_MALLOC;
	102	}
	103
	104	drvc->sr_ctx = sr_ctx;
	105	di->priv = drvc;
	106
	107	return SR_OK;
	108	}
	109
	110	static GSList fluke_scan(const char conn, const char *serialcomm)
	111	{
	112	struct sr_dev_inst *sdi;
	113	struct drv_context *drvc;
	114	struct dev_context *devc;
	115	struct sr_probe *probe;
	116	struct sr_serial_dev_inst *serial;
	117	GSList *devices;
	118	int retry, len, i, s;
	119	char buf[128], b, *tokens;
	120
	121	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
	122	return NULL;
	123
	124	if (serial_open(serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
	125	return NULL;
	126
	127	drvc = di->priv;
	128	b = buf;
	129	retry = 0;
	130	devices = NULL;
	131	/* We'll try the discovery sequence three times in case the device
	132	* is not in an idle state when we send ID. */
	133	while (!devices && retry < 3) {
	134	retry++;
	135	serial_flush(serial);
	136	if (serial_write(serial, "ID\r", 3) == -1) {
	137	sr_err("Unable to send ID string: %s.",
	138	strerror(errno));
	139	continue;
	140	}
	141
	142	/* Response is first a CMD_ACK byte (ASCII '0' for OK,
	143	* or '1' to signify an error. */
	144	len = 128;
	145	serial_readline(serial, &b, &len, 150);
	146	if (len != 1)
	147	continue;
	148	if (buf[0] != '0')
	149	continue;
	150
	151	/* If CMD_ACK was OK, ID string follows. */
	152	len = 128;
	153	serial_readline(serial, &b, &len, 850);
	154	if (len < 10)
	155	continue;
	156	if (strcspn(buf, ",") < 15)
	157	/* Looks like it's comma-separated. */
	158	tokens = g_strsplit(buf, ",", 3);
	159	else
	160	/* Fluke 199B, at least, uses semicolon. */
	161	tokens = g_strsplit(buf, ";", 3);
	162	if (!strncmp("FLUKE", tokens[0], 5)
	163	&& tokens[1] && tokens[2]) {
	164	for (i = 0; supported_flukedmm[i].model; i++) {
	165	if (strcmp(supported_flukedmm[i].modelname, tokens[0] + 6))
	166	continue;
	167	/* Skip leading spaces in version number. */
	168	for (s = 0; tokens[1][s] == ' '; s++);
	169	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Fluke",
	170	tokens[0] + 6, tokens[1] + s)))
	171	return NULL;
	172	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	173	sr_err("Device context malloc failed.");
	174	return NULL;
	175	}
	176	devc->profile = &supported_flukedmm[i];
	177	devc->serial = serial;
	178	sdi->priv = devc;
	179	sdi->driver = di;
	180	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	181	return NULL;
	182	sdi->probes = g_slist_append(sdi->probes, probe);
	183	drvc->instances = g_slist_append(drvc->instances, sdi);
	184	devices = g_slist_append(devices, sdi);
	185	break;
	186	}
	187	}
	188	g_strfreev(tokens);
	189	if (devices)
	190	/* Found one. */
	191	break;
	192	}
	193	serial_close(serial);
	194	if (!devices)
	195	sr_serial_dev_inst_free(serial);
	196
	197	return devices;
	198	}
	199
	200	static GSList hw_scan(GSList options)
	201	{
	202	struct sr_hwopt *opt;
	203	GSList l, devices;
	204	int i;
	205	const char conn, serialcomm;
	206
	207	conn = serialcomm = NULL;
	208	for (l = options; l; l = l->next) {
	209	opt = l->data;
	210	switch (opt->hwopt) {
	211	case SR_HWOPT_CONN:
	212	conn = opt->value;
	213	break;
	214	case SR_HWOPT_SERIALCOMM:
	215	serialcomm = opt->value;
	216	break;
	217	}
	218	}
	219	if (!conn)
	220	return NULL;
	221
	222	if (serialcomm) {
	223	/* Use the provided comm specs. */
	224	devices = fluke_scan(conn, serialcomm);
	225	} else {
	226	for (i = 0; scan_conn[i]; i++) {
	227	if ((devices = fluke_scan(conn, scan_conn[i])))
	228	break;
	229	/* The Scopemeter 199B, at least, requires this
	230	* after all the 115k/9.6k confusion. */
	231	g_usleep(5000);
	232	}
	233	}
	234
	235	return devices;
	236	}
	237
	238	static GSList *hw_dev_list(void)
	239	{
	240	struct drv_context *drvc;
	241
	242	drvc = di->priv;
	243
	244	return drvc->instances;
	245	}
	246
	247	static int hw_dev_open(struct sr_dev_inst *sdi)
	248	{
	249	struct dev_context *devc;
	250
	251	if (!(devc = sdi->priv)) {
	252	sr_err("sdi->priv was NULL.");
	253	return SR_ERR_BUG;
	254	}
	255
	256	if (serial_open(devc->serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
	257	return SR_ERR;
	258
	259	sdi->status = SR_ST_ACTIVE;
	260
	261	return SR_OK;
	262	}
	263
	264	static int hw_dev_close(struct sr_dev_inst *sdi)
	265	{
	266	struct dev_context *devc;
	267
	268	if (!(devc = sdi->priv)) {
	269	sr_err("sdi->priv was NULL.");
	270	return SR_ERR_BUG;
	271	}
	272
	273	if (devc->serial && devc->serial->fd != -1) {
	274	serial_close(devc->serial);
	275	sdi->status = SR_ST_INACTIVE;
	276	}
	277
	278	return SR_OK;
	279	}
	280
	281	static int hw_cleanup(void)
	282	{
	283
	284	clear_instances();
	285
	286	return SR_OK;
	287	}
	288
	289	static int hw_info_get(int info_id, const void **data,
	290	const struct sr_dev_inst *sdi)
	291	{
	292
	293	(void)sdi;
	294
	295	switch (info_id) {
	296	case SR_DI_HWOPTS:
	297	*data = hwopts;
	298	break;
	299	case SR_DI_HWCAPS:
	300	*data = hwcaps;
	301	break;
	302	case SR_DI_NUM_PROBES:
	303	*data = GINT_TO_POINTER(1);
	304	break;
	305	case SR_DI_PROBE_NAMES:
	306	*data = probe_names;
	307	break;
	308	default:
	309	return SR_ERR_ARG;
	310	}
	311
	312	return SR_OK;
	313	}
	314
	315	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	316	const void *value)
	317	{
	318	struct dev_context *devc;
	319
	320	if (sdi->status != SR_ST_ACTIVE)
	321	return SR_ERR;
	322
	323	if (!(devc = sdi->priv)) {
	324	sr_err("sdi->priv was NULL.");
	325	return SR_ERR_BUG;
	326	}
	327
	328	switch (hwcap) {
	329	case SR_HWCAP_LIMIT_MSEC:
	330	/* TODO: not yet implemented */
	331	if ((const uint64_t )value == 0) {
	332	sr_err("LIMIT_MSEC can't be 0.");
	333	return SR_ERR;
	334	}
	335	devc->limit_msec = (const uint64_t )value;
	336	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	337	devc->limit_msec);
	338	break;
	339	case SR_HWCAP_LIMIT_SAMPLES:
	340	devc->limit_samples = (const uint64_t )value;
	341	sr_dbg("Setting sample limit to %" PRIu64 ".",
	342	devc->limit_samples);
	343	break;
	344	default:
	345	sr_err("Unknown capability: %d.", hwcap);
	346	return SR_ERR;
	347	break;
	348	}
	349
	350	return SR_OK;
	351	}
	352
	353	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	354	void *cb_data)
	355	{
	356	struct sr_datafeed_packet packet;
	357	struct sr_datafeed_header header;
	358	struct sr_datafeed_meta_analog meta;
	359	struct dev_context *devc;
	360
	361	if (!(devc = sdi->priv)) {
	362	sr_err("sdi->priv was NULL.");
	363	return SR_ERR_BUG;
	364	}
	365
	366	sr_dbg("Starting acquisition.");
	367
	368	devc->cb_data = cb_data;
	369
	370	/* Send header packet to the session bus. */
	371	sr_dbg("Sending SR_DF_HEADER.");
	372	packet.type = SR_DF_HEADER;
	373	packet.payload = (uint8_t *)&header;
	374	header.feed_version = 1;
	375	gettimeofday(&header.starttime, NULL);
	376	sr_session_send(devc->cb_data, &packet);
	377
	378	/* Send metadata about the SR_DF_ANALOG packets to come. */
	379	sr_dbg("Sending SR_DF_META_ANALOG.");
	380	packet.type = SR_DF_META_ANALOG;
	381	packet.payload = &meta;
	382	meta.num_probes = 1;
	383	sr_session_send(devc->cb_data, &packet);
	384
	385	/* Poll every 100ms, or whenever some data comes in. */
	386	sr_source_add(devc->serial->fd, G_IO_IN, 50, fluke_receive_data, (void *)sdi);
	387
	388	if (serial_write(devc->serial, "QM\r", 3) == -1) {
	389	sr_err("Unable to send QM: %s.", strerror(errno));
	390	return SR_ERR;
	391	}
	392	devc->cmd_sent_at = g_get_monotonic_time() / 1000;
	393	devc->expect_response = TRUE;
	394
	395	return SR_OK;
	396	}
	397
	398	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	399	{
	400	struct sr_datafeed_packet packet;
	401	struct dev_context *devc;
	402
	403	if (sdi->status != SR_ST_ACTIVE)
	404	return SR_ERR;
	405
	406	if (!(devc = sdi->priv)) {
	407	sr_err("sdi->priv was NULL.");
	408	return SR_ERR_BUG;
	409	}
	410
	411	sr_dbg("Stopping acquisition.");
	412
	413	sr_source_remove(devc->serial->fd);
	414	hw_dev_close((struct sr_dev_inst *)sdi);
	415
	416	/* Send end packet to the session bus. */
	417	sr_dbg("Sending SR_DF_END.");
	418	packet.type = SR_DF_END;
	419	sr_session_send(cb_data, &packet);
	420
	421	return SR_OK;
	422	}
	423
	424	SR_PRIV struct sr_dev_driver flukedmm_driver_info = {
	425	.name = "fluke-dmm",
	426	.longname = "Fluke 18x/28x series DMMs",
	427	.api_version = 1,
	428	.init = hw_init,
	429	.cleanup = hw_cleanup,
	430	.scan = hw_scan,
	431	.dev_list = hw_dev_list,
	432	.dev_clear = clear_instances,
	433	.dev_open = hw_dev_open,
	434	.dev_close = hw_dev_close,
	435	.info_get = hw_info_get,
	436	.dev_config_set = hw_dev_config_set,
	437	.dev_acquisition_start = hw_dev_acquisition_start,
	438	.dev_acquisition_stop = hw_dev_acquisition_stop,
	439	.priv = NULL,
	440	};