[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 "radioshack-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_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;

static const struct radioshackdmm_profile supported_radioshackdmm[] = {
	{ RADIOSHACK_22_812, "22-812", 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 *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;
	GSList *devices;
	int fd, retry;
	size_t len;
	char 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 (serial_set_paramstr(fd, serialcomm) != SR_OK) {
		sr_err("Unable to set serial parameters.");
		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)
	{
		size_t i;
		size_t good_packets = 0;
		retry++;
		serial_flush(fd);

		/* Let's get a bit of data and see if we can find a packet */
		len = sizeof(buf);
		serial_readline(fd, &b, &len, 250);
		if( (len == 0) || (len < RS_22_812_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 - RS_22_812_PACKET_SIZE + 1;
		    /* don't increment i here */ )
		{
			const rs_22_812_packet *packet = (void *)(&buf[i]);
			if( !rs_22_812_is_packet_valid(packet) ){
				i++;
				continue;
			}
			good_packets++;
			i += RS_22_812_PACKET_SIZE;
		}

		/* If we dropped more than two packets worth of data, something
		 * is wrong */
		size_t 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 RS 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->profile = RADIOSHACK_22_812; */
		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 = rs_22_812_scan(conn, serialcomm);
	} else {
		/* Then try the default 4800 8n1 */
		devices = rs_22_812_scan(conn, "4800/8n1");
	}

	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_RDONLY);
	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; /* Does nothing. prevents "unused parameter" warning */

	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 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 100ms, or whenever some data comes in. */
	sr_source_add(devc->serial->fd, G_IO_IN, 50,
		      radioshack_receive_data, (void *)sdi );

	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 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"
	28	#include "libsigrok-internal.h"
	29	#include "radioshack-dmm.h"
d375b3c3 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
	49	SR_PRIV struct sr_dev_driver radioshackdmm_driver_info;
	50	static struct sr_dev_driver *di = &radioshackdmm_driver_info;
	51
	52	static const struct radioshackdmm_profile supported_radioshackdmm[] = {
	53	{ RADIOSHACK_22_812, "22-812", 100 },
	54	};
	55
d375b3c3 AG	56	/* Properly close and free all devices. */
	57	static int clear_instances(void)
	58	{
	59	struct sr_dev_inst *sdi;
	60	struct drv_context *drvc;
	61	struct dev_context *devc;
	62	GSList *l;
	63
	64	if (!(drvc = di->priv))
	65	return SR_OK;
	66
	67	drvc = di->priv;
	68	for (l = drvc->instances; l; l = l->next) {
	69	if (!(sdi = l->data))
	70	continue;
	71	if (!(devc = sdi->priv))
	72	continue;
	73	sr_serial_dev_inst_free(devc->serial);
	74	sr_dev_inst_free(sdi);
	75	}
	76	g_slist_free(drvc->instances);
	77	drvc->instances = NULL;
	78
	79	return SR_OK;
	80	}
	81
	82	static int hw_init(void)
	83	{
	84	struct drv_context *drvc;
	85
	86	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
dccbd0ed	87	sr_err("Driver context malloc failed.");
886a52b6	88	return SR_ERR_MALLOC;
d375b3c3 AG	89	}
	90
	91	di->priv = drvc;
	92
	93	return SR_OK;
	94	}
	95
d375b3c3 AG	96	static GSList rs_22_812_scan(const char conn, const char *serialcomm)
	97	{
	98	struct sr_dev_inst *sdi;
	99	struct drv_context *drvc;
	100	struct dev_context *devc;
	101	struct sr_probe *probe;
	102	GSList *devices;
	103	int fd, retry;
	104	size_t len;
	105	char buf[128], *b;
	106
be8dbf3a	107	if ((fd = serial_open(conn, O_RDONLY\|O_NONBLOCK)) == -1) {
dccbd0ed	108	sr_err("Unable to open %s: %s.", conn, strerror(errno));
d375b3c3 AG	109	return NULL;
	110	}
	111	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
dccbd0ed	112	sr_err("Unable to set serial parameters.");
d375b3c3 AG	113	return NULL;
	114	}
	115
dccbd0ed	116	sr_info("Probing port %s readonly.", conn);
be8dbf3a	117
d375b3c3 AG	118	drvc = di->priv;
	119	b = buf;
	120	retry = 0;
	121	devices = NULL;
	122	/* There's no way to get an ID from the multimeter. It just sends data
	123	* periodically, so the best we can do is check if the packets match the
	124	* expected format. */
	125	while (!devices && retry < 3)
	126	{
	127	size_t i;
	128	size_t good_packets = 0;
	129	retry++;
	130	serial_flush(fd);
	131
	132	/* Let's get a bit of data and see if we can find a packet */
	133	len = sizeof(buf);
	134	serial_readline(fd, &b, &len, 250);
	135	if( (len == 0) \|\| (len < RS_22_812_PACKET_SIZE) ) {
	136	/* Not enough data received, is the DMM connected ? */
	137	continue;
	138	}
	139
	140	/* Let's treat our buffer like a stream, and find any
	141	* valid packets */
	142	for( i = 0; i < len - RS_22_812_PACKET_SIZE + 1;
	143	/* don't increment i here */ )
	144	{
	145	const rs_22_812_packet packet = (void )(&buf[i]);
	146	if( !rs_22_812_is_packet_valid(packet) ){
	147	i++;
	148	continue;
	149	}
	150	good_packets++;
	151	i += RS_22_812_PACKET_SIZE;
	152	}
	153
	154	/* If we dropped more than two packets worth of data, something
	155	* is wrong */
	156	size_t dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
	157	if(dropped > 2 * RS_22_812_PACKET_SIZE)
	158	continue;
	159
	160	/* Let's see if we have anything good */
	161	if (good_packets == 0)
	162	continue;
	163
dccbd0ed	164	sr_info("Found RS 22-812 on port %s.", conn);
be8dbf3a	165
dccbd0ed	166	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "RadioShack",
d375b3c3 AG	167	"22-812", "")))
	168	return NULL;
	169	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
dccbd0ed	170	sr_err("Device context malloc failed.");
d375b3c3 AG	171	return NULL;
	172	}
	173
	174	/* devc->profile = RADIOSHACK_22_812; */
	175	devc->serial = sr_serial_dev_inst_new(conn, -1);
	176	devc->serialcomm = g_strdup(serialcomm);
	177
	178	sdi->priv = devc;
	179	sdi->driver = di;
	180	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	181	return NULL;
	182	sdi->probes = g_slist_append(sdi->probes, probe);
	183	drvc->instances = g_slist_append(drvc->instances, sdi);
	184	devices = g_slist_append(devices, sdi);
	185	break;
d375b3c3 AG	186	}
	187	serial_close(fd);
	188
	189	return devices;
	190	}
	191
	192	static GSList hw_scan(GSList options)
	193	{
	194	struct sr_hwopt *opt;
	195	GSList l, devices;
	196	const char conn, serialcomm;
	197
	198	conn = serialcomm = NULL;
	199	for (l = options; l; l = l->next) {
	200	opt = l->data;
	201	switch (opt->hwopt) {
	202	case SR_HWOPT_CONN:
	203	conn = opt->value;
	204	break;
	205	case SR_HWOPT_SERIALCOMM:
	206	serialcomm = opt->value;
	207	break;
	208	}
	209	}
	210	if (!conn)
	211	return NULL;
	212
	213	if (serialcomm) {
	214	/* Use the provided comm specs. */
	215	devices = rs_22_812_scan(conn, serialcomm);
	216	} else {
	217	/* Then try the default 4800 8n1 */
	218	devices = rs_22_812_scan(conn, "4800/8n1");
	219	}
	220
	221	return devices;
	222	}
	223
	224	static GSList *hw_dev_list(void)
	225	{
	226	struct drv_context *drvc;
	227
	228	drvc = di->priv;
	229
	230	return drvc->instances;
	231	}
	232
	233	static int hw_dev_open(struct sr_dev_inst *sdi)
	234	{
	235	struct dev_context *devc;
	236
	237	if (!(devc = sdi->priv)) {
dccbd0ed	238	sr_err("sdi->priv was NULL.");
d375b3c3 AG	239	return SR_ERR_BUG;
	240	}
	241
be8dbf3a	242	devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
d375b3c3	243	if (devc->serial->fd == -1) {
dccbd0ed	244	sr_err("Couldn't open serial port '%s'.",
d375b3c3 AG	245	devc->serial->port);
	246	return SR_ERR;
	247	}
	248	if (serial_set_paramstr(devc->serial->fd, devc->serialcomm) != SR_OK) {
dccbd0ed	249	sr_err("Unable to set serial parameters.");
d375b3c3 AG	250	return SR_ERR;
	251	}
	252	sdi->status = SR_ST_ACTIVE;
	253
	254	return SR_OK;
	255	}
	256
	257	static int hw_dev_close(struct sr_dev_inst *sdi)
	258	{
	259	struct dev_context *devc;
	260
	261	if (!(devc = sdi->priv)) {
dccbd0ed	262	sr_err("sdi->priv was NULL.");
d375b3c3 AG	263	return SR_ERR_BUG;
	264	}
	265
	266	if (devc->serial && devc->serial->fd != -1) {
	267	serial_close(devc->serial->fd);
	268	devc->serial->fd = -1;
	269	sdi->status = SR_ST_INACTIVE;
	270	}
	271
	272	return SR_OK;
	273	}
	274
	275	static int hw_cleanup(void)
	276	{
	277	clear_instances();
	278
	279	return SR_OK;
	280	}
	281
	282	static int hw_info_get(int info_id, const void **data,
	283	const struct sr_dev_inst *sdi)
	284	{
	285	(void)sdi; /* Does nothing. prevents "unused parameter" warning */
	286
	287	switch (info_id) {
	288	case SR_DI_HWOPTS:
	289	*data = hwopts;
	290	break;
	291	case SR_DI_HWCAPS:
	292	*data = hwcaps;
	293	break;
	294	case SR_DI_NUM_PROBES:
	295	*data = GINT_TO_POINTER(1);
	296	break;
	297	case SR_DI_PROBE_NAMES:
	298	*data = probe_names;
	299	break;
	300	default:
	301	return SR_ERR_ARG;
	302	}
	303
	304	return SR_OK;
	305	}
	306
	307	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	308	const void *value)
	309	{
	310	struct dev_context *devc;
	311
	312	if (sdi->status != SR_ST_ACTIVE)
	313	return SR_ERR;
	314
	315	if (!(devc = sdi->priv)) {
dccbd0ed	316	sr_err("sdi->priv was NULL.");
d375b3c3 AG	317	return SR_ERR_BUG;
	318	}
	319
	320	switch (hwcap) {
	321	case SR_HWCAP_LIMIT_SAMPLES:
	322	devc->limit_samples = (const uint64_t )value;
dccbd0ed	323	sr_dbg("Setting sample limit to %" PRIu64 ".",
d375b3c3 AG	324	devc->limit_samples);
	325	break;
	326	default:
dccbd0ed	327	sr_err("Unknown capability: %d.", hwcap);
d375b3c3 AG	328	return SR_ERR;
	329	break;
	330	}
	331
	332	return SR_OK;
	333	}
	334
	335	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	336	void *cb_data)
	337	{
	338	struct sr_datafeed_packet packet;
	339	struct sr_datafeed_header header;
	340	struct sr_datafeed_meta_analog meta;
	341	struct dev_context *devc;
	342
	343	if (!(devc = sdi->priv)) {
dccbd0ed	344	sr_err("sdi->priv was NULL.");
d375b3c3 AG	345	return SR_ERR_BUG;
	346	}
	347
dccbd0ed	348	sr_dbg("Starting acquisition.");
d375b3c3 AG	349
	350	devc->cb_data = cb_data;
	351
be8dbf3a AG	352	/* Reset the number of samples to take. If we've already collected our
	353	* quota, but we start a new session, and don't reset this, we'll just
	354	* quit without aquiring any new samples */
	355	devc->num_samples = 0;
	356
d375b3c3	357	/* Send header packet to the session bus. */
dccbd0ed	358	sr_dbg("Sending SR_DF_HEADER.");
d375b3c3 AG	359	packet.type = SR_DF_HEADER;
	360	packet.payload = (uint8_t *)&header;
	361	header.feed_version = 1;
	362	gettimeofday(&header.starttime, NULL);
	363	sr_session_send(devc->cb_data, &packet);
	364
	365	/* Send metadata about the SR_DF_ANALOG packets to come. */
dccbd0ed	366	sr_dbg("Sending SR_DF_META_ANALOG.");
d375b3c3 AG	367	packet.type = SR_DF_META_ANALOG;
	368	packet.payload = &meta;
	369	meta.num_probes = 1;
	370	sr_session_send(devc->cb_data, &packet);
	371
	372	/* Poll every 100ms, or whenever some data comes in. */
	373	sr_source_add(devc->serial->fd, G_IO_IN, 50,
	374	radioshack_receive_data, (void *)sdi );
	375
	376	return SR_OK;
	377	}
	378
	379	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
	380	void *cb_data)
	381	{
	382	struct sr_datafeed_packet packet;
	383	struct dev_context *devc;
	384
	385	if (sdi->status != SR_ST_ACTIVE)
	386	return SR_ERR;
	387
	388	if (!(devc = sdi->priv)) {
dccbd0ed	389	sr_err("sdi->priv was NULL.");
d375b3c3 AG	390	return SR_ERR_BUG;
	391	}
	392
dccbd0ed	393	sr_dbg("Stopping acquisition.");
d375b3c3 AG	394
	395	sr_source_remove(devc->serial->fd);
	396	hw_dev_close((struct sr_dev_inst *)sdi);
	397
	398	/* Send end packet to the session bus. */
dccbd0ed	399	sr_dbg("Sending SR_DF_END.");
d375b3c3 AG	400	packet.type = SR_DF_END;
	401	sr_session_send(cb_data, &packet);
	402
	403	return SR_OK;
	404	}
	405
	406	SR_PRIV struct sr_dev_driver radioshackdmm_driver_info = {
	407	.name = "radioshack-dmm",
	408	.longname = "Radioshack 22-812/22-039 DMMs",
	409	.api_version = 1,
	410	.init = hw_init,
	411	.cleanup = hw_cleanup,
	412	.scan = hw_scan,
	413	.dev_list = hw_dev_list,
	414	.dev_clear = clear_instances,
	415	.dev_open = hw_dev_open,
	416	.dev_close = hw_dev_close,
	417	.info_get = hw_info_get,
	418	.dev_config_set = hw_dev_config_set,
	419	.dev_acquisition_start = hw_dev_acquisition_start,
	420	.dev_acquisition_stop = hw_dev_acquisition_stop,
	421	.priv = NULL,
	422	};