[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"

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;
	GSList *devices;
	int i, len, fd, retry, good_packets = 0, dropped, ret;
	uint8_t buf[128], *b;

	if ((fd = serial_open(conn, O_RDONLY | O_NONBLOCK)) == -1) {
		sr_err("Unable to open %s: %s.", conn, strerror(errno));
		return NULL;
	}
	if ((ret = serial_set_paramstr(fd, serialcomm)) != SR_OK) {
		sr_err("Unable to set serial parameters: %d", ret);
		return NULL;
	}

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

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

	/*
	 * 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(fd, (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 = 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;
	}

	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 = lcd14_scan(conn, serialcomm);
	} else {
		/* Try the default 2400/8n1. */
		devices = lcd14_scan(conn, "2400/8n1");
	}

	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)
{
	int ret;
	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_RDONLY);
	if (devc->serial->fd == -1) {
		sr_err("Couldn't open serial port '%s'.", devc->serial->port);
		return SR_ERR;
	}

	ret = serial_set_paramstr(devc->serial->fd, devc->serialcomm);
	if (ret != SR_OK) {
		sr_err("Unable to set serial parameters: %d.", ret);
		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_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 AG	30
	31	static const int hwopts[] = {
	32	SR_HWOPT_CONN,
	33	SR_HWOPT_SERIALCOMM,
	34	0,
	35	};
	36
	37	static const int hwcaps[] = {
	38	SR_HWCAP_MULTIMETER,
	39	SR_HWCAP_LIMIT_SAMPLES,
	40	SR_HWCAP_CONTINUOUS,
	41	0,
	42	};
	43
	44	static const char *probe_names[] = {
	45	"Probe",
	46	NULL,
	47	};
	48
bbabddbd UH	49	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info;
bbabddbd UH	50	static struct sr_dev_driver *di = &tekpower_dmm_driver_info;
7dc55d93 AG	51
	52	/* Properly close and free all devices. */
	53	static int clear_instances(void)
	54	{
	55	struct sr_dev_inst *sdi;
	56	struct drv_context *drvc;
	57	struct dev_context *devc;
	58	GSList *l;
	59
	60	if (!(drvc = di->priv))
	61	return SR_OK;
	62
	63	drvc = di->priv;
	64	for (l = drvc->instances; l; l = l->next) {
	65	if (!(sdi = l->data))
	66	continue;
	67	if (!(devc = sdi->priv))
	68	continue;
	69	sr_serial_dev_inst_free(devc->serial);
	70	sr_dev_inst_free(sdi);
	71	}
	72	g_slist_free(drvc->instances);
	73	drvc->instances = NULL;
	74
	75	return SR_OK;
	76	}
	77
	78	static int hw_init(void)
	79	{
	80	struct drv_context *drvc;
	81
	82	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
bbabddbd UH	83	sr_err("Driver context malloc failed.");
bbabddbd UH	84	return SR_ERR_MALLOC;
7dc55d93 AG	85	}
	86
	87	di->priv = drvc;
	88
	89	return SR_OK;
	90	}
	91
7dc55d93 AG	92	static GSList lcd14_scan(const char conn, const char *serialcomm)
	93	{
	94	struct sr_dev_inst *sdi;
	95	struct drv_context *drvc;
	96	struct dev_context *devc;
	97	struct sr_probe *probe;
	98	GSList *devices;
bbabddbd	99	int i, len, fd, retry, good_packets = 0, dropped, ret;
8c1adf37	100	uint8_t buf[128], *b;
7dc55d93	101
bbabddbd UH	102	if ((fd = serial_open(conn, O_RDONLY \| O_NONBLOCK)) == -1) {
bbabddbd UH	103	sr_err("Unable to open %s: %s.", conn, strerror(errno));
7dc55d93 AG	104	return NULL;
7dc55d93 AG	105	}
bbabddbd UH	106	if ((ret = serial_set_paramstr(fd, serialcomm)) != SR_OK) {
bbabddbd UH	107	sr_err("Unable to set serial parameters: %d", ret);
7dc55d93 AG	108	return NULL;
	109	}
	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;
	117	serial_flush(fd);
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);
8c1adf37	129	serial_readline(fd, (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
7dc55d93 AG	168	devc->serial = sr_serial_dev_inst_new(conn, -1);
	169	devc->serialcomm = g_strdup(serialcomm);
	170
	171	sdi->priv = devc;
	172	sdi->driver = di;
	173	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	174	return NULL;
	175	sdi->probes = g_slist_append(sdi->probes, probe);
	176	drvc->instances = g_slist_append(drvc->instances, sdi);
	177	devices = g_slist_append(devices, sdi);
	178	break;
	179	}
	180
	181	serial_close(fd);
	182	return devices;
	183	}
	184
	185	static GSList hw_scan(GSList options)
	186	{
	187	struct sr_hwopt *opt;
	188	GSList l, devices;
	189	const char conn, serialcomm;
	190
	191	conn = serialcomm = NULL;
	192	for (l = options; l; l = l->next) {
	193	opt = l->data;
	194	switch (opt->hwopt) {
	195	case SR_HWOPT_CONN:
	196	conn = opt->value;
	197	break;
	198	case SR_HWOPT_SERIALCOMM:
	199	serialcomm = opt->value;
	200	break;
	201	}
	202	}
	203	if (!conn)
	204	return NULL;
	205
	206	if (serialcomm) {
	207	/* Use the provided comm specs. */
	208	devices = lcd14_scan(conn, serialcomm);
	209	} else {
bbabddbd	210	/* Try the default 2400/8n1. */
7dc55d93 AG	211	devices = lcd14_scan(conn, "2400/8n1");
	212	}
	213
	214	return devices;
	215	}
	216
	217	static GSList *hw_dev_list(void)
	218	{
	219	struct drv_context *drvc;
	220
	221	drvc = di->priv;
	222
	223	return drvc->instances;
	224	}
	225
	226	static int hw_dev_open(struct sr_dev_inst *sdi)
	227	{
bbabddbd	228	int ret;
7dc55d93 AG	229	struct dev_context *devc;
	230
	231	if (!(devc = sdi->priv)) {
	232	sr_err("sdi->priv was NULL.");
	233	return SR_ERR_BUG;
	234	}
	235
	236	devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
	237	if (devc->serial->fd == -1) {
bbabddbd	238	sr_err("Couldn't open serial port '%s'.", devc->serial->port);
7dc55d93 AG	239	return SR_ERR;
7dc55d93 AG	240	}
bbabddbd UH	241
	242	ret = serial_set_paramstr(devc->serial->fd, devc->serialcomm);
	243	if (ret != SR_OK) {
	244	sr_err("Unable to set serial parameters: %d.", ret);
7dc55d93 AG	245	return SR_ERR;
	246	}
	247	sdi->status = SR_ST_ACTIVE;
	248
	249	return SR_OK;
	250	}
	251
	252	static int hw_dev_close(struct sr_dev_inst *sdi)
	253	{
	254	struct dev_context *devc;
	255
	256	if (!(devc = sdi->priv)) {
	257	sr_err("sdi->priv was NULL.");
	258	return SR_ERR_BUG;
	259	}
	260
	261	if (devc->serial && devc->serial->fd != -1) {
	262	serial_close(devc->serial->fd);
	263	devc->serial->fd = -1;
	264	sdi->status = SR_ST_INACTIVE;
	265	}
	266
	267	return SR_OK;
	268	}
	269
	270	static int hw_cleanup(void)
	271	{
	272	clear_instances();
	273
	274	return SR_OK;
	275	}
	276
	277	static int hw_info_get(int info_id, const void **data,
bbabddbd	278	const struct sr_dev_inst *sdi)
7dc55d93	279	{
bbabddbd	280	(void)sdi;
7dc55d93 AG	281
	282	switch (info_id) {
	283	case SR_DI_HWOPTS:
	284	*data = hwopts;
	285	break;
	286	case SR_DI_HWCAPS:
	287	*data = hwcaps;
	288	break;
	289	case SR_DI_NUM_PROBES:
	290	*data = GINT_TO_POINTER(1);
	291	break;
	292	case SR_DI_PROBE_NAMES:
	293	*data = probe_names;
	294	break;
	295	default:
	296	return SR_ERR_ARG;
	297	}
	298
	299	return SR_OK;
	300	}
	301
	302	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
bbabddbd	303	const void *value)
7dc55d93 AG	304	{
	305	struct dev_context *devc;
	306
	307	if (sdi->status != SR_ST_ACTIVE)
	308	return SR_ERR;
	309
	310	if (!(devc = sdi->priv)) {
	311	sr_err("sdi->priv was NULL.");
	312	return SR_ERR_BUG;
	313	}
	314
	315	switch (hwcap) {
	316	case SR_HWCAP_LIMIT_SAMPLES:
	317	devc->limit_samples = (const uint64_t )value;
	318	sr_dbg("Setting sample limit to %" PRIu64 ".",
	319	devc->limit_samples);
	320	break;
	321	default:
	322	sr_err("Unknown capability: %d.", hwcap);
	323	return SR_ERR;
	324	break;
	325	}
	326
	327	return SR_OK;
	328	}
	329
	330	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
bbabddbd	331	void *cb_data)
7dc55d93 AG	332	{
	333	struct sr_datafeed_packet packet;
	334	struct sr_datafeed_header header;
	335	struct sr_datafeed_meta_analog meta;
	336	struct dev_context *devc;
	337
	338	if (!(devc = sdi->priv)) {
	339	sr_err("sdi->priv was NULL.");
	340	return SR_ERR_BUG;
	341	}
	342
	343	sr_dbg("Starting acquisition.");
	344
	345	devc->cb_data = cb_data;
	346
bbabddbd UH	347	/*
bbabddbd UH	348	* Reset the number of samples to take. If we've already collected our
7dc55d93	349	* quota, but we start a new session, and don't reset this, we'll just
bbabddbd UH	350	* quit without acquiring any new samples.
bbabddbd UH	351	*/
7dc55d93 AG	352	devc->num_samples = 0;
	353
	354	/* Send header packet to the session bus. */
	355	sr_dbg("Sending SR_DF_HEADER.");
	356	packet.type = SR_DF_HEADER;
	357	packet.payload = (uint8_t *)&header;
	358	header.feed_version = 1;
	359	gettimeofday(&header.starttime, NULL);
	360	sr_session_send(devc->cb_data, &packet);
	361
	362	/* Send metadata about the SR_DF_ANALOG packets to come. */
	363	sr_dbg("Sending SR_DF_META_ANALOG.");
	364	packet.type = SR_DF_META_ANALOG;
	365	packet.payload = &meta;
	366	meta.num_probes = 1;
	367	sr_session_send(devc->cb_data, &packet);
	368
bbabddbd	369	/* Poll every 50ms, or whenever some data comes in. */
7dc55d93	370	sr_source_add(devc->serial->fd, G_IO_IN, 50,
bbabddbd	371	tekpower_dmm_receive_data, (void *)sdi);
7dc55d93 AG	372
	373	return SR_OK;
	374	}
	375
69b07d14	376	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
7dc55d93 AG	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
bbabddbd	402	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info = {
7dc55d93	403	.name = "tekpower-dmm",
bbabddbd	404	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
7dc55d93 AG	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	};