[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(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, 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 = 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);
	}
	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;
	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;
	}

	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 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(struct sr_context *sr_ctx)
	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	drvc->sr_ctx = sr_ctx;
	94	di->priv = drvc;
	95
	96	return SR_OK;
	97	}
	98
	99	static GSList fluke_scan(const char conn, const char *serialcomm)
	100	{
	101	struct sr_dev_inst *sdi;
	102	struct drv_context *drvc;
	103	struct dev_context *devc;
	104	struct sr_probe *probe;
	105	struct sr_serial_dev_inst *serial;
	106	GSList *devices;
	107	int retry, len, i, s;
	108	char buf[128], b, *tokens;
	109
	110	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
	111	return NULL;
	112
	113	if (serial_open(serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
	114	return NULL;
	115
	116	drvc = di->priv;
	117	b = buf;
	118	retry = 0;
	119	devices = NULL;
	120	/* We'll try the discovery sequence three times in case the device
	121	* is not in an idle state when we send ID. */
	122	while (!devices && retry < 3) {
	123	retry++;
	124	serial_flush(serial);
	125	if (serial_write(serial, "ID\r", 3) == -1) {
	126	sr_err("Unable to send ID string: %s.",
	127	strerror(errno));
	128	continue;
	129	}
	130
	131	/* Response is first a CMD_ACK byte (ASCII '0' for OK,
	132	* or '1' to signify an error. */
	133	len = 128;
	134	serial_readline(serial, &b, &len, 150);
	135	if (len != 1)
	136	continue;
	137	if (buf[0] != '0')
	138	continue;
	139
	140	/* If CMD_ACK was OK, ID string follows. */
	141	len = 128;
	142	serial_readline(serial, &b, &len, 150);
	143	if (len < 10)
	144	continue;
	145	tokens = g_strsplit(buf, ",", 3);
	146	if (!strncmp("FLUKE", tokens[0], 5)
	147	&& tokens[1] && tokens[2]) {
	148	for (i = 0; supported_flukedmm[i].model; i++) {
	149	if (strcmp(supported_flukedmm[i].modelname, tokens[0] + 6))
	150	continue;
	151	/* Skip leading spaces in version number. */
	152	for (s = 0; tokens[1][s] == ' '; s++);
	153	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Fluke",
	154	tokens[0] + 6, tokens[1] + s)))
	155	return NULL;
	156	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	157	sr_err("Device context malloc failed.");
	158	return NULL;
	159	}
	160	devc->profile = &supported_flukedmm[i];
	161	devc->serial = serial;
	162	sdi->priv = devc;
	163	sdi->driver = di;
	164	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	165	return NULL;
	166	sdi->probes = g_slist_append(sdi->probes, probe);
	167	drvc->instances = g_slist_append(drvc->instances, sdi);
	168	devices = g_slist_append(devices, sdi);
	169	break;
	170	}
	171	}
	172	g_strfreev(tokens);
	173	}
	174	serial_close(serial);
	175	if (!devices)
	176	sr_serial_dev_inst_free(serial);
	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	if (serial_open(devc->serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
	235	return SR_ERR;
	236
	237	sdi->status = SR_ST_ACTIVE;
	238
	239	return SR_OK;
	240	}
	241
	242	static int hw_dev_close(struct sr_dev_inst *sdi)
	243	{
	244	struct dev_context *devc;
	245
	246	if (!(devc = sdi->priv)) {
	247	sr_err("sdi->priv was NULL.");
	248	return SR_ERR_BUG;
	249	}
	250
	251	if (devc->serial && devc->serial->fd != -1) {
	252	serial_close(devc->serial);
	253	sdi->status = SR_ST_INACTIVE;
	254	}
	255
	256	return SR_OK;
	257	}
	258
	259	static int hw_cleanup(void)
	260	{
	261
	262	clear_instances();
	263
	264	return SR_OK;
	265	}
	266
	267	static int hw_info_get(int info_id, const void **data,
	268	const struct sr_dev_inst *sdi)
	269	{
	270
	271	(void)sdi;
	272
	273	switch (info_id) {
	274	case SR_DI_HWOPTS:
	275	*data = hwopts;
	276	break;
	277	case SR_DI_HWCAPS:
	278	*data = hwcaps;
	279	break;
	280	case SR_DI_NUM_PROBES:
	281	*data = GINT_TO_POINTER(1);
	282	break;
	283	case SR_DI_PROBE_NAMES:
	284	*data = probe_names;
	285	break;
	286	default:
	287	return SR_ERR_ARG;
	288	}
	289
	290	return SR_OK;
	291	}
	292
	293	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	294	const void *value)
	295	{
	296	struct dev_context *devc;
	297
	298	if (sdi->status != SR_ST_ACTIVE)
	299	return SR_ERR;
	300
	301	if (!(devc = sdi->priv)) {
	302	sr_err("sdi->priv was NULL.");
	303	return SR_ERR_BUG;
	304	}
	305
	306	switch (hwcap) {
	307	case SR_HWCAP_LIMIT_MSEC:
	308	/* TODO: not yet implemented */
	309	if ((const uint64_t )value == 0) {
	310	sr_err("LIMIT_MSEC can't be 0.");
	311	return SR_ERR;
	312	}
	313	devc->limit_msec = (const uint64_t )value;
	314	sr_dbg("Setting time limit to %" PRIu64 "ms.",
	315	devc->limit_msec);
	316	break;
	317	case SR_HWCAP_LIMIT_SAMPLES:
	318	devc->limit_samples = (const uint64_t )value;
	319	sr_dbg("Setting sample limit to %" PRIu64 ".",
	320	devc->limit_samples);
	321	break;
	322	default:
	323	sr_err("Unknown capability: %d.", hwcap);
	324	return SR_ERR;
	325	break;
	326	}
	327
	328	return SR_OK;
	329	}
	330
	331	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	332	void *cb_data)
	333	{
	334	struct sr_datafeed_packet packet;
	335	struct sr_datafeed_header header;
	336	struct sr_datafeed_meta_analog meta;
	337	struct dev_context *devc;
	338
	339	if (!(devc = sdi->priv)) {
	340	sr_err("sdi->priv was NULL.");
	341	return SR_ERR_BUG;
	342	}
	343
	344	sr_dbg("Starting acquisition.");
	345
	346	devc->cb_data = cb_data;
	347
	348	/* Send header packet to the session bus. */
	349	sr_dbg("Sending SR_DF_HEADER.");
	350	packet.type = SR_DF_HEADER;
	351	packet.payload = (uint8_t *)&header;
	352	header.feed_version = 1;
	353	gettimeofday(&header.starttime, NULL);
	354	sr_session_send(devc->cb_data, &packet);
	355
	356	/* Send metadata about the SR_DF_ANALOG packets to come. */
	357	sr_dbg("Sending SR_DF_META_ANALOG.");
	358	packet.type = SR_DF_META_ANALOG;
	359	packet.payload = &meta;
	360	meta.num_probes = 1;
	361	sr_session_send(devc->cb_data, &packet);
	362
	363	/* Poll every 100ms, or whenever some data comes in. */
	364	sr_source_add(devc->serial->fd, G_IO_IN, 50, fluke_receive_data, (void *)sdi);
	365
	366	if (serial_write(devc->serial, "QM\r", 3) == -1) {
	367	sr_err("Unable to send QM: %s.", strerror(errno));
	368	return SR_ERR;
	369	}
	370	devc->cmd_sent_at = g_get_monotonic_time() / 1000;
	371	devc->expect_response = TRUE;
	372
	373	return SR_OK;
	374	}
	375
	376	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	377	{
	378	struct sr_datafeed_packet packet;
	379	struct dev_context *devc;
	380
	381	if (sdi->status != SR_ST_ACTIVE)
	382	return SR_ERR;
	383
	384	if (!(devc = sdi->priv)) {
	385	sr_err("sdi->priv was NULL.");
	386	return SR_ERR_BUG;
	387	}
	388
	389	sr_dbg("Stopping acquisition.");
	390
	391	sr_source_remove(devc->serial->fd);
	392	hw_dev_close((struct sr_dev_inst *)sdi);
	393
	394	/* Send end packet to the session bus. */
	395	sr_dbg("Sending SR_DF_END.");
	396	packet.type = SR_DF_END;
	397	sr_session_send(cb_data, &packet);
	398
	399	return SR_OK;
	400	}
	401
	402	SR_PRIV struct sr_dev_driver flukedmm_driver_info = {
	403	.name = "fluke-dmm",
	404	.longname = "Fluke 18x/28x series DMMs",
	405	.api_version = 1,
	406	.init = hw_init,
	407	.cleanup = hw_cleanup,
	408	.scan = hw_scan,
	409	.dev_list = hw_dev_list,
	410	.dev_clear = clear_instances,
	411	.dev_open = hw_dev_open,
	412	.dev_close = hw_dev_close,
	413	.info_get = hw_info_get,
	414	.dev_config_set = hw_dev_config_set,
	415	.dev_acquisition_start = hw_dev_acquisition_start,
	416	.dev_acquisition_stop = hw_dev_acquisition_stop,
	417	.priv = NULL,
	418	};