[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 const struct flukedmm_profile supported_flukedmm[] = {
	{ FLUKE_187, "187", 100 },
	{ FLUKE_287, "287", 100 },
};


/* 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(void)
{
	struct drv_context *drvc;

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

	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;
	GSList *devices;
	int fd, retry, len, i, s;
	char buf[128], *b, **tokens;

	if ((fd = serial_open(conn, O_RDWR|O_NONBLOCK)) == -1) {
		sr_err("Unable to open %s: %s.", conn, strerror(errno));
		return NULL;
	}
	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
		sr_err("Unable to set serial parameters.");
		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(fd);
		if (serial_write(fd, "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(fd, &b, &len, 150);
		if (len != 1)
			continue;
		if (buf[0] != '0')
			continue;

		/* If CMD_ACK was OK, ID string follows. */
		len = 128;
		serial_readline(fd, &b, &len, 150);
		if (len < 10)
			continue;
		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 = sr_serial_dev_inst_new(conn, -1);
				devc->serialcomm = g_strdup(serialcomm);
				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);
	}
	serial_close(fd);

	return devices;
}

static GSList *hw_scan(GSList *options)
{
	struct sr_hwopt *opt;
	GSList *l, *devices;
	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 {
		/* Try 115200, as used on 287/289. */
		devices = fluke_scan(conn, "115200/8n1");
		if (!devices)
			/* Fall back to 9600 for 187/189. */
			devices = fluke_scan(conn, "9600/8n1");
	}

	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;
	}

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