[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;

/* 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, i, good_packets, dropped;
	char buf[128], *b;
	const struct rs_22_812_packet *rs_packet;

	if ((fd = serial_open(conn, O_RDONLY | O_NONBLOCK)) < 0) {
		sr_err("Unable to open '%s': %s.", conn, fd);
		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) {
		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;
		}

		/* 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 = 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 {
		/* 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 < 0) {
		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;

	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"
	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
d375b3c3 AG	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)))) {
dccbd0ed	83	sr_err("Driver context malloc failed.");
886a52b6	84	return SR_ERR_MALLOC;
d375b3c3 AG	85	}
	86
	87	di->priv = drvc;
	88
	89	return SR_OK;
	90	}
	91
d375b3c3 AG	92	static GSList rs_22_812_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;
	99	int fd, retry;
ba6383f8	100	size_t len, i, good_packets, dropped;
d375b3c3	101	char buf[128], *b;
ba6383f8	102	const struct rs_22_812_packet *rs_packet;
d375b3c3	103
ba6383f8 UH	104	if ((fd = serial_open(conn, O_RDONLY \| O_NONBLOCK)) < 0) {
ba6383f8 UH	105	sr_err("Unable to open '%s': %s.", conn, fd);
d375b3c3 AG	106	return NULL;
d375b3c3 AG	107	}
ba6383f8	108
d375b3c3	109	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
dccbd0ed	110	sr_err("Unable to set serial parameters.");
d375b3c3 AG	111	return NULL;
	112	}
	113
ba6383f8	114	sr_info("Probing port '%s' readonly.", conn);
be8dbf3a	115
d375b3c3 AG	116	drvc = di->priv;
	117	b = buf;
	118	retry = 0;
	119	devices = NULL;
ba6383f8 UH	120
	121	/*
	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
	124	* the expected format.
	125	*/
	126	while (!devices && retry < 3) {
	127	good_packets = 0;
d375b3c3 AG	128	retry++;
	129	serial_flush(fd);
	130
ba6383f8	131	/* Let's get a bit of data and see if we can find a packet. */
d375b3c3 AG	132	len = sizeof(buf);
d375b3c3 AG	133	serial_readline(fd, &b, &len, 250);
ba6383f8 UH	134	if ((len == 0) \|\| (len < RS_22_812_PACKET_SIZE)) {
ba6383f8 UH	135	/* Not enough data received, is the DMM connected? */
d375b3c3 AG	136	continue;
	137	}
	138
ba6383f8 UH	139	/* Treat our buffer as stream, and find any valid packets. */
	140	for (i = 0; i < len - RS_22_812_PACKET_SIZE + 1;) {
	141	rs_packet = (void *)(&buf[i]);
	142	if (!rs_22_812_packet_valid(rs_packet)) {
d375b3c3 AG	143	i++;
	144	continue;
	145	}
	146	good_packets++;
	147	i += RS_22_812_PACKET_SIZE;
	148	}
	149
ba6383f8 UH	150	/* If we dropped more than two packets, something is wrong. */
	151	dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
	152	if (dropped > 2 * RS_22_812_PACKET_SIZE)
d375b3c3 AG	153	continue;
d375b3c3 AG	154
ba6383f8	155	/* Let's see if we have anything good. */
d375b3c3 AG	156	if (good_packets == 0)
	157	continue;
	158
ba6383f8	159	sr_info("Found RadioShack 22-812 on port '%s'.", conn);
be8dbf3a	160
dccbd0ed	161	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "RadioShack",
d375b3c3 AG	162	"22-812", "")))
d375b3c3 AG	163	return NULL;
ba6383f8	164
d375b3c3	165	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
dccbd0ed	166	sr_err("Device context malloc failed.");
d375b3c3 AG	167	return NULL;
	168	}
	169
d375b3c3 AG	170	devc->serial = sr_serial_dev_inst_new(conn, -1);
	171	devc->serialcomm = g_strdup(serialcomm);
	172
	173	sdi->priv = devc;
	174	sdi->driver = di;
	175	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	176	return NULL;
	177	sdi->probes = g_slist_append(sdi->probes, probe);
	178	drvc->instances = g_slist_append(drvc->instances, sdi);
	179	devices = g_slist_append(devices, sdi);
	180	break;
d375b3c3 AG	181	}
	182	serial_close(fd);
	183
	184	return devices;
	185	}
	186
ba6383f8	187	static GSList hw_scan(GSList options)
d375b3c3 AG	188	{
	189	struct sr_hwopt *opt;
	190	GSList l, devices;
	191	const char conn, serialcomm;
	192
	193	conn = serialcomm = NULL;
	194	for (l = options; l; l = l->next) {
	195	opt = l->data;
	196	switch (opt->hwopt) {
	197	case SR_HWOPT_CONN:
	198	conn = opt->value;
	199	break;
	200	case SR_HWOPT_SERIALCOMM:
	201	serialcomm = opt->value;
	202	break;
	203	}
	204	}
	205	if (!conn)
	206	return NULL;
	207
	208	if (serialcomm) {
	209	/* Use the provided comm specs. */
	210	devices = rs_22_812_scan(conn, serialcomm);
	211	} else {
ba6383f8	212	/* Try the default 4800/8n1. */
d375b3c3 AG	213	devices = rs_22_812_scan(conn, "4800/8n1");
	214	}
	215
	216	return devices;
	217	}
	218
	219	static GSList *hw_dev_list(void)
	220	{
	221	struct drv_context *drvc;
	222
	223	drvc = di->priv;
	224
	225	return drvc->instances;
	226	}
	227
	228	static int hw_dev_open(struct sr_dev_inst *sdi)
	229	{
	230	struct dev_context *devc;
	231
	232	if (!(devc = sdi->priv)) {
dccbd0ed	233	sr_err("sdi->priv was NULL.");
d375b3c3 AG	234	return SR_ERR_BUG;
	235	}
	236
be8dbf3a	237	devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
ba6383f8 UH	238	if (devc->serial->fd < 0) {
ba6383f8 UH	239	sr_err("Couldn't open serial port '%s'.", devc->serial->port);
d375b3c3 AG	240	return SR_ERR;
	241	}
	242	if (serial_set_paramstr(devc->serial->fd, devc->serialcomm) != SR_OK) {
dccbd0ed	243	sr_err("Unable to set serial parameters.");
d375b3c3 AG	244	return SR_ERR;
	245	}
	246	sdi->status = SR_ST_ACTIVE;
	247
	248	return SR_OK;
	249	}
	250
	251	static int hw_dev_close(struct sr_dev_inst *sdi)
	252	{
	253	struct dev_context *devc;
	254
	255	if (!(devc = sdi->priv)) {
dccbd0ed	256	sr_err("sdi->priv was NULL.");
d375b3c3 AG	257	return SR_ERR_BUG;
	258	}
	259
	260	if (devc->serial && devc->serial->fd != -1) {
	261	serial_close(devc->serial->fd);
	262	devc->serial->fd = -1;
	263	sdi->status = SR_ST_INACTIVE;
	264	}
	265
	266	return SR_OK;
	267	}
	268
	269	static int hw_cleanup(void)
	270	{
	271	clear_instances();
	272
	273	return SR_OK;
	274	}
	275
	276	static int hw_info_get(int info_id, const void **data,
ba6383f8	277	const struct sr_dev_inst *sdi)
d375b3c3	278	{
ba6383f8	279	(void)sdi;
d375b3c3 AG	280
	281	switch (info_id) {
	282	case SR_DI_HWOPTS:
	283	*data = hwopts;
	284	break;
	285	case SR_DI_HWCAPS:
	286	*data = hwcaps;
	287	break;
	288	case SR_DI_NUM_PROBES:
	289	*data = GINT_TO_POINTER(1);
	290	break;
	291	case SR_DI_PROBE_NAMES:
	292	*data = probe_names;
	293	break;
	294	default:
ba6383f8	295	sr_err("Unknown info_id: %d.", info_id);
d375b3c3 AG	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,
ba6383f8	303	const void *value)
d375b3c3 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)) {
dccbd0ed	311	sr_err("sdi->priv was NULL.");
d375b3c3 AG	312	return SR_ERR_BUG;
	313	}
	314
	315	switch (hwcap) {
	316	case SR_HWCAP_LIMIT_SAMPLES:
	317	devc->limit_samples = (const uint64_t )value;
dccbd0ed	318	sr_dbg("Setting sample limit to %" PRIu64 ".",
d375b3c3 AG	319	devc->limit_samples);
	320	break;
	321	default:
dccbd0ed	322	sr_err("Unknown capability: %d.", hwcap);
ba6383f8	323	return SR_ERR_ARG;
d375b3c3 AG	324	break;
	325	}
	326
	327	return SR_OK;
	328	}
	329
	330	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
ba6383f8	331	void *cb_data)
d375b3c3 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)) {
dccbd0ed	339	sr_err("sdi->priv was NULL.");
d375b3c3 AG	340	return SR_ERR_BUG;
	341	}
	342
dccbd0ed	343	sr_dbg("Starting acquisition.");
d375b3c3 AG	344
	345	devc->cb_data = cb_data;
	346
ba6383f8 UH	347	/*
ba6383f8 UH	348	* Reset the number of samples to take. If we've already collected our
be8dbf3a	349	* quota, but we start a new session, and don't reset this, we'll just
ba6383f8 UH	350	* quit without aquiring any new samples.
ba6383f8 UH	351	*/
be8dbf3a AG	352	devc->num_samples = 0;
be8dbf3a AG	353
d375b3c3	354	/* Send header packet to the session bus. */
dccbd0ed	355	sr_dbg("Sending SR_DF_HEADER.");
d375b3c3	356	packet.type = SR_DF_HEADER;
ba6383f8	357	packet.payload = (uint8_t *) & header;
d375b3c3 AG	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. */
dccbd0ed	363	sr_dbg("Sending SR_DF_META_ANALOG.");
d375b3c3 AG	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
ba6383f8	369	/* Poll every 50ms, or whenever some data comes in. */
d375b3c3	370	sr_source_add(devc->serial->fd, G_IO_IN, 50,
ba6383f8	371	radioshack_dmm_receive_data, (void *)sdi);
d375b3c3 AG	372
	373	return SR_OK;
	374	}
	375
69b07d14	376	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
d375b3c3 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)) {
dccbd0ed	385	sr_err("sdi->priv was NULL.");
d375b3c3 AG	386	return SR_ERR_BUG;
	387	}
	388
dccbd0ed	389	sr_dbg("Stopping acquisition.");
d375b3c3 AG	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. */
dccbd0ed	395	sr_dbg("Sending SR_DF_END.");
d375b3c3 AG	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 radioshackdmm_driver_info = {
	403	.name = "radioshack-dmm",
ba6383f8	404	.longname = "RadioShack 22-812/22-039 DMMs",
d375b3c3 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	};