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

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 "protocol.h"

#define SERIALCOMM "2400/8n1"

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

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

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

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

/* 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 *lcd14_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 i, len, retry, good_packets = 0, dropped;
	uint8_t buf[128], *b;

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

	if (serial_open(serial, O_RDONLY|O_NONBLOCK) != SR_OK)
		return NULL;

	sr_info("Probing port %s readonly.", conn);

	drvc = di->priv;
	b = buf;
	retry = 0;
	devices = NULL;
	serial_flush(serial);

	/*
	 * There's no way to get an ID from the multimeter. It just sends data
	 * periodically, so the best we can do is check if the packets match
	 * the expected format.
	 */
	while (!devices && retry < 3) {
		retry++;

		/* Let's get a bit of data and see if we can find a packet. */
		len = sizeof(buf);
		serial_readline(serial, (char **)&b, &len, 500);
		if ((len == 0) || (len < FS9721_PACKET_SIZE)) {
			/* Not enough data received, is the DMM connected? */
			continue;
		}

		/* Let's treat our buffer like a stream, and find any
		 * valid packets */
		for (i = 0; i < len - FS9721_PACKET_SIZE + 1;) {
			if (!sr_fs9721_packet_valid(&buf[i])) {
				i++;
				continue;
			}
			good_packets++;
			i += FS9721_PACKET_SIZE;
		}

		/*
		 * If we dropped more than two packets worth of data,
		 * something is wrong.
		 */
		dropped = len - (good_packets * FS9721_PACKET_SIZE);
		if (dropped > 2 * FS9721_PACKET_SIZE)
			continue;

		/* Let's see if we have anything good. */
		if (good_packets == 0)
			continue;

		sr_info("Found device on port %s.", conn);

		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
					    "TP4000ZC", "")))
			return NULL;
		if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
			sr_err("Device context malloc failed.");
			return NULL;
		}

		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;
	}

	serial_close(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 = lcd14_scan(conn, serialcomm);
	} else {
		/* Try the default. */
		devices = lcd14_scan(conn, SERIALCOMM);
	}

	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, O_RDONLY) != 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_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;

	/*
	 * Reset the number of samples to take. If we've already collected our
	 * quota, but we start a new session, and don't reset this, we'll just
	 * quit without acquiring any new samples.
	 */
	devc->num_samples = 0;

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

	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 tekpower_dmm_driver_info = {
	.name = "tekpower-dmm",
	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
	.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
7dc55d93 AG	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include <glib.h>
7dc55d93 AG	22	#include <sys/types.h>
	23	#include <sys/stat.h>
	24	#include <fcntl.h>
	25	#include <string.h>
	26	#include <errno.h>
bbabddbd UH	27	#include "libsigrok.h"
	28	#include "libsigrok-internal.h"
	29	#include "protocol.h"
7dc55d93	30
d35afa87 BV	31	#define SERIALCOMM "2400/8n1"
d35afa87 BV	32
7dc55d93 AG	33	static const int hwopts[] = {
	34	SR_HWOPT_CONN,
	35	SR_HWOPT_SERIALCOMM,
	36	0,
	37	};
	38
	39	static const int hwcaps[] = {
	40	SR_HWCAP_MULTIMETER,
	41	SR_HWCAP_LIMIT_SAMPLES,
	42	SR_HWCAP_CONTINUOUS,
	43	0,
	44	};
	45
	46	static const char *probe_names[] = {
	47	"Probe",
	48	NULL,
	49	};
	50
bbabddbd UH	51	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info;
bbabddbd UH	52	static struct sr_dev_driver *di = &tekpower_dmm_driver_info;
7dc55d93 AG	53
	54	/* Properly close and free all devices. */
	55	static int clear_instances(void)
	56	{
	57	struct sr_dev_inst *sdi;
	58	struct drv_context *drvc;
	59	struct dev_context *devc;
	60	GSList *l;
	61
	62	if (!(drvc = di->priv))
	63	return SR_OK;
	64
	65	drvc = di->priv;
	66	for (l = drvc->instances; l; l = l->next) {
	67	if (!(sdi = l->data))
	68	continue;
	69	if (!(devc = sdi->priv))
	70	continue;
	71	sr_serial_dev_inst_free(devc->serial);
	72	sr_dev_inst_free(sdi);
	73	}
	74	g_slist_free(drvc->instances);
	75	drvc->instances = NULL;
	76
	77	return SR_OK;
	78	}
	79
	80	static int hw_init(void)
	81	{
	82	struct drv_context *drvc;
	83
	84	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
bbabddbd UH	85	sr_err("Driver context malloc failed.");
bbabddbd UH	86	return SR_ERR_MALLOC;
7dc55d93 AG	87	}
	88
	89	di->priv = drvc;
	90
	91	return SR_OK;
	92	}
	93
7dc55d93 AG	94	static GSList lcd14_scan(const char conn, const char *serialcomm)
	95	{
	96	struct sr_dev_inst *sdi;
	97	struct drv_context *drvc;
	98	struct dev_context *devc;
	99	struct sr_probe *probe;
d35afa87	100	struct sr_serial_dev_inst *serial;
7dc55d93	101	GSList *devices;
d35afa87	102	int i, len, retry, good_packets = 0, dropped;
8c1adf37	103	uint8_t buf[128], *b;
7dc55d93	104
d35afa87	105	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
7dc55d93	106	return NULL;
d35afa87 BV	107
d35afa87 BV	108	if (serial_open(serial, O_RDONLY\|O_NONBLOCK) != SR_OK)
7dc55d93	109	return NULL;
7dc55d93	110
bbabddbd	111	sr_info("Probing port %s readonly.", conn);
7dc55d93 AG	112
	113	drvc = di->priv;
	114	b = buf;
	115	retry = 0;
	116	devices = NULL;
d35afa87	117	serial_flush(serial);
bbabddbd UH	118
	119	/*
	120	* There's no way to get an ID from the multimeter. It just sends data
	121	* periodically, so the best we can do is check if the packets match
	122	* the expected format.
	123	*/
	124	while (!devices && retry < 3) {
7dc55d93 AG	125	retry++;
7dc55d93 AG	126
bbabddbd	127	/* Let's get a bit of data and see if we can find a packet. */
7dc55d93	128	len = sizeof(buf);
d35afa87	129	serial_readline(serial, (char **)&b, &len, 500);
be5c1d3b	130	if ((len == 0) \|\| (len < FS9721_PACKET_SIZE)) {
bbabddbd	131	/* Not enough data received, is the DMM connected? */
7dc55d93 AG	132	continue;
	133	}
	134
	135	/* Let's treat our buffer like a stream, and find any
	136	* valid packets */
be5c1d3b	137	for (i = 0; i < len - FS9721_PACKET_SIZE + 1;) {
8c1adf37	138	if (!sr_fs9721_packet_valid(&buf[i])) {
7dc55d93 AG	139	i++;
	140	continue;
	141	}
	142	good_packets++;
be5c1d3b	143	i += FS9721_PACKET_SIZE;
7dc55d93 AG	144	}
7dc55d93 AG	145
bbabddbd UH	146	/*
	147	* If we dropped more than two packets worth of data,
	148	* something is wrong.
	149	*/
be5c1d3b AG	150	dropped = len - (good_packets * FS9721_PACKET_SIZE);
be5c1d3b AG	151	if (dropped > 2 * FS9721_PACKET_SIZE)
7dc55d93 AG	152	continue;
7dc55d93 AG	153
bbabddbd	154	/* Let's see if we have anything good. */
7dc55d93 AG	155	if (good_packets == 0)
	156	continue;
	157
bbabddbd	158	sr_info("Found device on port %s.", conn);
7dc55d93 AG	159
	160	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
	161	"TP4000ZC", "")))
	162	return NULL;
	163	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
bbabddbd	164	sr_err("Device context malloc failed.");
7dc55d93 AG	165	return NULL;
	166	}
	167
d35afa87	168	devc->serial = serial;
7dc55d93 AG	169
	170	sdi->priv = devc;
	171	sdi->driver = di;
	172	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	173	return NULL;
	174	sdi->probes = g_slist_append(sdi->probes, probe);
	175	drvc->instances = g_slist_append(drvc->instances, sdi);
	176	devices = g_slist_append(devices, sdi);
	177	break;
	178	}
	179
d35afa87	180	serial_close(serial);
7dc55d93 AG	181	return devices;
	182	}
	183
	184	static GSList hw_scan(GSList options)
	185	{
	186	struct sr_hwopt *opt;
	187	GSList l, devices;
	188	const char conn, serialcomm;
	189
	190	conn = serialcomm = NULL;
	191	for (l = options; l; l = l->next) {
	192	opt = l->data;
	193	switch (opt->hwopt) {
	194	case SR_HWOPT_CONN:
	195	conn = opt->value;
	196	break;
	197	case SR_HWOPT_SERIALCOMM:
	198	serialcomm = opt->value;
	199	break;
	200	}
	201	}
	202	if (!conn)
	203	return NULL;
	204
	205	if (serialcomm) {
	206	/* Use the provided comm specs. */
	207	devices = lcd14_scan(conn, serialcomm);
	208	} else {
d35afa87 BV	209	/* Try the default. */
d35afa87 BV	210	devices = lcd14_scan(conn, SERIALCOMM);
7dc55d93 AG	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
d35afa87	234	if (serial_open(devc->serial, O_RDONLY) != SR_OK)
7dc55d93	235	return SR_ERR;
bbabddbd	236
7dc55d93 AG	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) {
d35afa87	252	serial_close(devc->serial);
7dc55d93 AG	253	sdi->status = SR_ST_INACTIVE;
	254	}
	255
	256	return SR_OK;
	257	}
	258
	259	static int hw_cleanup(void)
	260	{
	261	clear_instances();
	262
	263	return SR_OK;
	264	}
	265
	266	static int hw_info_get(int info_id, const void **data,
bbabddbd	267	const struct sr_dev_inst *sdi)
7dc55d93	268	{
bbabddbd	269	(void)sdi;
7dc55d93 AG	270
	271	switch (info_id) {
	272	case SR_DI_HWOPTS:
	273	*data = hwopts;
	274	break;
	275	case SR_DI_HWCAPS:
	276	*data = hwcaps;
	277	break;
	278	case SR_DI_NUM_PROBES:
	279	*data = GINT_TO_POINTER(1);
	280	break;
	281	case SR_DI_PROBE_NAMES:
	282	*data = probe_names;
	283	break;
	284	default:
	285	return SR_ERR_ARG;
	286	}
	287
	288	return SR_OK;
	289	}
	290
	291	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
bbabddbd	292	const void *value)
7dc55d93 AG	293	{
	294	struct dev_context *devc;
	295
	296	if (sdi->status != SR_ST_ACTIVE)
	297	return SR_ERR;
	298
	299	if (!(devc = sdi->priv)) {
	300	sr_err("sdi->priv was NULL.");
	301	return SR_ERR_BUG;
	302	}
	303
	304	switch (hwcap) {
	305	case SR_HWCAP_LIMIT_SAMPLES:
	306	devc->limit_samples = (const uint64_t )value;
	307	sr_dbg("Setting sample limit to %" PRIu64 ".",
	308	devc->limit_samples);
	309	break;
	310	default:
	311	sr_err("Unknown capability: %d.", hwcap);
	312	return SR_ERR;
	313	break;
	314	}
	315
	316	return SR_OK;
	317	}
	318
	319	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
bbabddbd	320	void *cb_data)
7dc55d93 AG	321	{
	322	struct sr_datafeed_packet packet;
	323	struct sr_datafeed_header header;
	324	struct sr_datafeed_meta_analog meta;
	325	struct dev_context *devc;
	326
	327	if (!(devc = sdi->priv)) {
	328	sr_err("sdi->priv was NULL.");
	329	return SR_ERR_BUG;
	330	}
	331
	332	sr_dbg("Starting acquisition.");
	333
	334	devc->cb_data = cb_data;
	335
bbabddbd UH	336	/*
bbabddbd UH	337	* Reset the number of samples to take. If we've already collected our
7dc55d93	338	* quota, but we start a new session, and don't reset this, we'll just
bbabddbd UH	339	* quit without acquiring any new samples.
bbabddbd UH	340	*/
7dc55d93 AG	341	devc->num_samples = 0;
	342
	343	/* Send header packet to the session bus. */
	344	sr_dbg("Sending SR_DF_HEADER.");
	345	packet.type = SR_DF_HEADER;
	346	packet.payload = (uint8_t *)&header;
	347	header.feed_version = 1;
	348	gettimeofday(&header.starttime, NULL);
	349	sr_session_send(devc->cb_data, &packet);
	350
	351	/* Send metadata about the SR_DF_ANALOG packets to come. */
	352	sr_dbg("Sending SR_DF_META_ANALOG.");
	353	packet.type = SR_DF_META_ANALOG;
	354	packet.payload = &meta;
	355	meta.num_probes = 1;
	356	sr_session_send(devc->cb_data, &packet);
	357
bbabddbd	358	/* Poll every 50ms, or whenever some data comes in. */
7dc55d93	359	sr_source_add(devc->serial->fd, G_IO_IN, 50,
bbabddbd	360	tekpower_dmm_receive_data, (void *)sdi);
7dc55d93 AG	361
	362	return SR_OK;
	363	}
	364
69b07d14	365	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
7dc55d93 AG	366	{
	367	struct sr_datafeed_packet packet;
	368	struct dev_context *devc;
	369
	370	if (sdi->status != SR_ST_ACTIVE)
	371	return SR_ERR;
	372
	373	if (!(devc = sdi->priv)) {
	374	sr_err("sdi->priv was NULL.");
	375	return SR_ERR_BUG;
	376	}
	377
	378	sr_dbg("Stopping acquisition.");
	379
	380	sr_source_remove(devc->serial->fd);
	381	hw_dev_close((struct sr_dev_inst *)sdi);
	382
	383	/* Send end packet to the session bus. */
	384	sr_dbg("Sending SR_DF_END.");
	385	packet.type = SR_DF_END;
	386	sr_session_send(cb_data, &packet);
	387
	388	return SR_OK;
	389	}
	390
bbabddbd	391	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info = {
7dc55d93	392	.name = "tekpower-dmm",
bbabddbd	393	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
7dc55d93 AG	394	.api_version = 1,
	395	.init = hw_init,
	396	.cleanup = hw_cleanup,
	397	.scan = hw_scan,
	398	.dev_list = hw_dev_list,
	399	.dev_clear = clear_instances,
	400	.dev_open = hw_dev_open,
	401	.dev_close = hw_dev_close,
	402	.info_get = hw_info_get,
	403	.dev_config_set = hw_dev_config_set,
	404	.dev_acquisition_start = hw_dev_acquisition_start,
	405	.dev_acquisition_stop = hw_dev_acquisition_stop,
	406	.priv = NULL,
	407	};