[libsigrok.git] / hardware / radioshack-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 "4800/8n1"

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 radioshackdmm_driver_info;
static struct sr_dev_driver *di = &radioshackdmm_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 *rs_22_812_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;
	size_t len, i, good_packets, dropped;
	char buf[128], *b;
	const struct rs_22_812_packet *rs_packet;

	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;

	/*
	 * 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) {
		good_packets = 0;
		retry++;
		serial_flush(serial);

		/* Let's get a bit of data and see if we can find a packet. */
		len = sizeof(buf);
		serial_readline(serial, &b, &len, 250);
		if ((len == 0) || (len < RS_22_812_PACKET_SIZE)) {
			/* Not enough data received, is the DMM connected? */
			continue;
		}

		/* Treat our buffer as stream, and find any valid packets. */
		for (i = 0; i < len - RS_22_812_PACKET_SIZE + 1;) {
			rs_packet = (void *)(&buf[i]);
			if (!rs_22_812_packet_valid(rs_packet)) {
				i++;
				continue;
			}
			good_packets++;
			i += RS_22_812_PACKET_SIZE;
		}

		/* If we dropped more than two packets, something is wrong. */
		dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
		if (dropped > 2 * RS_22_812_PACKET_SIZE)
			continue;

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

		sr_info("Found RadioShack 22-812 on port '%s'.", conn);

		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "RadioShack",
					    "22-812", "")))
			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 = rs_22_812_scan(conn, serialcomm);
	else
		/* Try the default. */
		devices = rs_22_812_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:
		sr_err("Unknown info_id: %d.", info_id);
		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_ARG;
		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 aquiring 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,
		      radioshack_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 radioshackdmm_driver_info = {
	.name = "radioshack-dmm",
	.longname = "RadioShack 22-812/22-039 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
d375b3c3 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>
d375b3c3 AG	22	#include <sys/types.h>
	23	#include <sys/stat.h>
	24	#include <fcntl.h>
	25	#include <string.h>
	26	#include <errno.h>
6f22a8ef UH	27	#include "libsigrok.h"
6f22a8ef UH	28	#include "libsigrok-internal.h"
936e27f1	29	#include "protocol.h"
d375b3c3	30
401476da BV	31	#define SERIALCOMM "4800/8n1"
401476da BV	32
d375b3c3 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
	51	SR_PRIV struct sr_dev_driver radioshackdmm_driver_info;
	52	static struct sr_dev_driver *di = &radioshackdmm_driver_info;
	53
d375b3c3 AG	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)))) {
dccbd0ed	85	sr_err("Driver context malloc failed.");
886a52b6	86	return SR_ERR_MALLOC;
d375b3c3 AG	87	}
	88
	89	di->priv = drvc;
	90
	91	return SR_OK;
	92	}
	93
d375b3c3 AG	94	static GSList rs_22_812_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;
401476da	100	struct sr_serial_dev_inst *serial;
d375b3c3	101	GSList *devices;
401476da	102	int retry;
ba6383f8	103	size_t len, i, good_packets, dropped;
d375b3c3	104	char buf[128], *b;
ba6383f8	105	const struct rs_22_812_packet *rs_packet;
d375b3c3	106
401476da	107	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
d375b3c3	108	return NULL;
ba6383f8	109
401476da	110	if (serial_open(serial, O_RDONLY\|O_NONBLOCK) != SR_OK)
d375b3c3	111	return NULL;
d375b3c3	112
ba6383f8	113	sr_info("Probing port '%s' readonly.", conn);
be8dbf3a	114
d375b3c3 AG	115	drvc = di->priv;
	116	b = buf;
	117	retry = 0;
	118	devices = NULL;
ba6383f8 UH	119
	120	/*
	121	* There's no way to get an ID from the multimeter. It just sends data
	122	* periodically, so the best we can do is check if the packets match
	123	* the expected format.
	124	*/
	125	while (!devices && retry < 3) {
	126	good_packets = 0;
d375b3c3	127	retry++;
401476da	128	serial_flush(serial);
d375b3c3	129
ba6383f8	130	/* Let's get a bit of data and see if we can find a packet. */
d375b3c3	131	len = sizeof(buf);
401476da	132	serial_readline(serial, &b, &len, 250);
ba6383f8 UH	133	if ((len == 0) \|\| (len < RS_22_812_PACKET_SIZE)) {
ba6383f8 UH	134	/* Not enough data received, is the DMM connected? */
d375b3c3 AG	135	continue;
	136	}
	137
ba6383f8 UH	138	/* Treat our buffer as stream, and find any valid packets. */
	139	for (i = 0; i < len - RS_22_812_PACKET_SIZE + 1;) {
	140	rs_packet = (void *)(&buf[i]);
	141	if (!rs_22_812_packet_valid(rs_packet)) {
d375b3c3 AG	142	i++;
	143	continue;
	144	}
	145	good_packets++;
	146	i += RS_22_812_PACKET_SIZE;
	147	}
	148
ba6383f8 UH	149	/* If we dropped more than two packets, something is wrong. */
	150	dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
	151	if (dropped > 2 * RS_22_812_PACKET_SIZE)
d375b3c3 AG	152	continue;
d375b3c3 AG	153
ba6383f8	154	/* Let's see if we have anything good. */
d375b3c3 AG	155	if (good_packets == 0)
	156	continue;
	157
ba6383f8	158	sr_info("Found RadioShack 22-812 on port '%s'.", conn);
be8dbf3a	159
dccbd0ed	160	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "RadioShack",
d375b3c3 AG	161	"22-812", "")))
d375b3c3 AG	162	return NULL;
ba6383f8	163
d375b3c3	164	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
dccbd0ed	165	sr_err("Device context malloc failed.");
d375b3c3 AG	166	return NULL;
	167	}
	168
401476da	169	devc->serial = serial;
d375b3c3 AG	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;
d375b3c3	179	}
401476da	180	serial_close(serial);
d375b3c3 AG	181
	182	return devices;
	183	}
	184
ba6383f8	185	static GSList hw_scan(GSList options)
d375b3c3 AG	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
401476da	206	if (serialcomm)
d375b3c3 AG	207	/* Use the provided comm specs. */
d375b3c3 AG	208	devices = rs_22_812_scan(conn, serialcomm);
401476da BV	209	else
	210	/* Try the default. */
	211	devices = rs_22_812_scan(conn, SERIALCOMM);
d375b3c3 AG	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)) {
dccbd0ed	230	sr_err("sdi->priv was NULL.");
d375b3c3 AG	231	return SR_ERR_BUG;
	232	}
	233
401476da	234	if (serial_open(devc->serial, O_RDONLY) != SR_OK)
d375b3c3	235	return SR_ERR;
401476da	236
d375b3c3 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)) {
dccbd0ed	247	sr_err("sdi->priv was NULL.");
d375b3c3 AG	248	return SR_ERR_BUG;
	249	}
	250
	251	if (devc->serial && devc->serial->fd != -1) {
401476da	252	serial_close(devc->serial);
d375b3c3 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,
ba6383f8	267	const struct sr_dev_inst *sdi)
d375b3c3	268	{
ba6383f8	269	(void)sdi;
d375b3c3 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:
ba6383f8	285	sr_err("Unknown info_id: %d.", info_id);
d375b3c3 AG	286	return SR_ERR_ARG;
	287	}
	288
	289	return SR_OK;
	290	}
	291
	292	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
ba6383f8	293	const void *value)
d375b3c3 AG	294	{
	295	struct dev_context *devc;
	296
	297	if (sdi->status != SR_ST_ACTIVE)
	298	return SR_ERR;
	299
	300	if (!(devc = sdi->priv)) {
dccbd0ed	301	sr_err("sdi->priv was NULL.");
d375b3c3 AG	302	return SR_ERR_BUG;
	303	}
	304
	305	switch (hwcap) {
	306	case SR_HWCAP_LIMIT_SAMPLES:
	307	devc->limit_samples = (const uint64_t )value;
dccbd0ed	308	sr_dbg("Setting sample limit to %" PRIu64 ".",
d375b3c3 AG	309	devc->limit_samples);
	310	break;
	311	default:
dccbd0ed	312	sr_err("Unknown capability: %d.", hwcap);
ba6383f8	313	return SR_ERR_ARG;
d375b3c3 AG	314	break;
	315	}
	316
	317	return SR_OK;
	318	}
	319
	320	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
ba6383f8	321	void *cb_data)
d375b3c3 AG	322	{
	323	struct sr_datafeed_packet packet;
	324	struct sr_datafeed_header header;
	325	struct sr_datafeed_meta_analog meta;
	326	struct dev_context *devc;
	327
	328	if (!(devc = sdi->priv)) {
dccbd0ed	329	sr_err("sdi->priv was NULL.");
d375b3c3 AG	330	return SR_ERR_BUG;
	331	}
	332
dccbd0ed	333	sr_dbg("Starting acquisition.");
d375b3c3 AG	334
	335	devc->cb_data = cb_data;
	336
ba6383f8 UH	337	/*
ba6383f8 UH	338	* Reset the number of samples to take. If we've already collected our
be8dbf3a	339	* quota, but we start a new session, and don't reset this, we'll just
ba6383f8 UH	340	* quit without aquiring any new samples.
ba6383f8 UH	341	*/
be8dbf3a AG	342	devc->num_samples = 0;
be8dbf3a AG	343
d375b3c3	344	/* Send header packet to the session bus. */
dccbd0ed	345	sr_dbg("Sending SR_DF_HEADER.");
d375b3c3	346	packet.type = SR_DF_HEADER;
ba6383f8	347	packet.payload = (uint8_t *) & header;
d375b3c3 AG	348	header.feed_version = 1;
	349	gettimeofday(&header.starttime, NULL);
	350	sr_session_send(devc->cb_data, &packet);
	351
	352	/* Send metadata about the SR_DF_ANALOG packets to come. */
dccbd0ed	353	sr_dbg("Sending SR_DF_META_ANALOG.");
d375b3c3 AG	354	packet.type = SR_DF_META_ANALOG;
	355	packet.payload = &meta;
	356	meta.num_probes = 1;
	357	sr_session_send(devc->cb_data, &packet);
	358
ba6383f8	359	/* Poll every 50ms, or whenever some data comes in. */
d375b3c3	360	sr_source_add(devc->serial->fd, G_IO_IN, 50,
ba6383f8	361	radioshack_dmm_receive_data, (void *)sdi);
d375b3c3 AG	362
	363	return SR_OK;
	364	}
	365
69b07d14	366	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
d375b3c3 AG	367	{
	368	struct sr_datafeed_packet packet;
	369	struct dev_context *devc;
	370
	371	if (sdi->status != SR_ST_ACTIVE)
	372	return SR_ERR;
	373
	374	if (!(devc = sdi->priv)) {
dccbd0ed	375	sr_err("sdi->priv was NULL.");
d375b3c3 AG	376	return SR_ERR_BUG;
	377	}
	378
dccbd0ed	379	sr_dbg("Stopping acquisition.");
d375b3c3 AG	380
	381	sr_source_remove(devc->serial->fd);
	382	hw_dev_close((struct sr_dev_inst *)sdi);
	383
	384	/* Send end packet to the session bus. */
dccbd0ed	385	sr_dbg("Sending SR_DF_END.");
d375b3c3 AG	386	packet.type = SR_DF_END;
	387	sr_session_send(cb_data, &packet);
	388
	389	return SR_OK;
	390	}
	391
	392	SR_PRIV struct sr_dev_driver radioshackdmm_driver_info = {
	393	.name = "radioshack-dmm",
ba6383f8	394	.longname = "RadioShack 22-812/22-039 DMMs",
d375b3c3 AG	395	.api_version = 1,
	396	.init = hw_init,
	397	.cleanup = hw_cleanup,
	398	.scan = hw_scan,
	399	.dev_list = hw_dev_list,
	400	.dev_clear = clear_instances,
	401	.dev_open = hw_dev_open,
	402	.dev_close = hw_dev_close,
	403	.info_get = hw_info_get,
	404	.dev_config_set = hw_dev_config_set,
	405	.dev_acquisition_start = hw_dev_acquisition_start,
	406	.dev_acquisition_stop = hw_dev_acquisition_stop,
	407	.priv = NULL,
	408	};