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

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.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 "agilent-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_LIMIT_MSEC,
	SR_HWCAP_CONTINUOUS,
	0,
};

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

extern const struct agdmm_job agdmm_jobs_u123x[];
extern const struct agdmm_recv agdmm_recvs_u123x[];
extern const struct agdmm_job agdmm_jobs_u125x[];
extern const struct agdmm_recv agdmm_recvs_u125x[];

/* This works on all the Agilent U12xxA series, although the
 * U127xA can apparently also run at 19200/8n1. */
#define SERIALCOMM "9600/8n1"

static const struct agdmm_profile supported_agdmm[] = {
	{ AGILENT_U1231A, "U1231A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1232A, "U1232A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1233A, "U1233A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1251A, "U1251A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ AGILENT_U1252A, "U1252A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ AGILENT_U1253A, "U1253A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ 0, NULL, NULL, NULL }
};

SR_PRIV struct sr_dev_driver agdmm_driver_info;
static struct sr_dev_driver *di = &agdmm_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 *hw_scan(GSList *options)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_hwopt *opt;
	struct sr_probe *probe;
	GSList *l, *devices;
	int len, fd, i;
	const char *conn, *serialcomm;
	char *buf, **tokens;

	drvc = di->priv;
	drvc->instances = NULL;

	devices = NULL;
	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 ((fd = serial_open(conn, O_RDWR|O_NONBLOCK)) == -1) {
		sr_err("Unable to open %s: %s.", conn, strerror(errno));
		return NULL;
	}

	if (!serialcomm)
		serialcomm = SERIALCOMM;
	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
		sr_err("Unable to set serial parameters: %s.",
		       strerror(errno));
		return NULL;
	}

	serial_flush(fd);
	if (serial_write(fd, "*IDN?\r\n", 7) == -1) {
		sr_err("Unable to send identification string: %s.",
		       strerror(errno));
		return NULL;
	}

	len = 128;
	if (!(buf = g_try_malloc(len))) {
		sr_err("Serial buffer malloc failed.");
		return NULL;
	}
	serial_readline(fd, &buf, &len, 150);
	if (!len)
		return NULL;

	tokens = g_strsplit(buf, ",", 4);
	if (!strcmp("Agilent Technologies", tokens[0])
			&& tokens[2] && tokens[3]) {
		for (i = 0; supported_agdmm[i].model; i++) {
			if (strcmp(supported_agdmm[i].modelname, tokens[1]))
				continue;
			if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
					tokens[1], tokens[3])))
				return NULL;
			if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
				sr_err("Device context malloc failed.");
				return NULL;
			}
			devc->profile = &supported_agdmm[i];
			devc->serial = sr_serial_dev_inst_new(conn, -1);
			devc->cur_mq = -1;
			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;
		}
	}
	g_strfreev(tokens);
	g_free(buf);

	serial_close(fd);

	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_RDWR | O_NONBLOCK);
	if (devc->serial->fd == -1) {
		sr_err("Couldn't open serial port '%s'.",
		       devc->serial->port);
		return SR_ERR;
	}
	serial_set_paramstr(devc->serial->fd, SERIALCOMM);
	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_MSEC:
		/* TODO: not yet implemented */
		if (*(const uint64_t *)value == 0) {
			sr_err("LIMIT_MSEC can't be 0.");
			return SR_ERR;
		}
		devc->limit_msec = *(const uint64_t *)value;
		sr_dbg("Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	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;

	/* 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, 100, agdmm_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 agdmm_driver_info = {
	.name = "agilent-dmm",
	.longname = "Agilent U12xx series 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
e93cdf42 BV	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation, either version 3 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <glib.h>
e93cdf42 BV	21	#include <sys/types.h>
	22	#include <sys/stat.h>
	23	#include <fcntl.h>
	24	#include <string.h>
	25	#include <errno.h>
6f22a8ef UH	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28	#include "agilent-dmm.h"
e93cdf42 BV	29
	30	static const int hwopts[] = {
	31	SR_HWOPT_CONN,
	32	SR_HWOPT_SERIALCOMM,
	33	0,
	34	};
	35
	36	static const int hwcaps[] = {
	37	SR_HWCAP_MULTIMETER,
	38	SR_HWCAP_LIMIT_SAMPLES,
	39	SR_HWCAP_LIMIT_MSEC,
	40	SR_HWCAP_CONTINUOUS,
	41	0,
	42	};
	43
	44	static const char *probe_names[] = {
	45	"Probe",
	46	NULL,
	47	};
	48
8c0152f2 BV	49	extern const struct agdmm_job agdmm_jobs_u123x[];
	50	extern const struct agdmm_recv agdmm_recvs_u123x[];
	51	extern const struct agdmm_job agdmm_jobs_u125x[];
	52	extern const struct agdmm_recv agdmm_recvs_u125x[];
e93cdf42	53
74ac7d7f BV	54	/* This works on all the Agilent U12xxA series, although the
	55	* U127xA can apparently also run at 19200/8n1. */
	56	#define SERIALCOMM "9600/8n1"
	57
e93cdf42	58	static const struct agdmm_profile supported_agdmm[] = {
74ac7d7f BV	59	{ AGILENT_U1231A, "U1231A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	60	{ AGILENT_U1232A, "U1232A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	61	{ AGILENT_U1233A, "U1233A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	62	{ AGILENT_U1251A, "U1251A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	63	{ AGILENT_U1252A, "U1252A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	64	{ AGILENT_U1253A, "U1253A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	65	{ 0, NULL, NULL, NULL }
e93cdf42 BV	66	};
	67
	68	SR_PRIV struct sr_dev_driver agdmm_driver_info;
	69	static struct sr_dev_driver *di = &agdmm_driver_info;
	70
	71	/* Properly close and free all devices. */
	72	static int clear_instances(void)
	73	{
	74	struct sr_dev_inst *sdi;
	75	struct drv_context *drvc;
	76	struct dev_context *devc;
	77	GSList *l;
	78
	79	if (!(drvc = di->priv))
	80	return SR_OK;
	81
	82	drvc = di->priv;
	83	for (l = drvc->instances; l; l = l->next) {
	84	if (!(sdi = l->data))
	85	continue;
	86	if (!(devc = sdi->priv))
	87	continue;
	88	sr_serial_dev_inst_free(devc->serial);
	89	sr_dev_inst_free(sdi);
	90	}
	91	g_slist_free(drvc->instances);
	92	drvc->instances = NULL;
	93
	94	return SR_OK;
	95	}
	96
	97	static int hw_init(void)
	98	{
	99	struct drv_context *drvc;
	100
	101	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
38d326e8	102	sr_err("Driver context malloc failed.");
886a52b6	103	return SR_ERR_MALLOC;
e93cdf42 BV	104	}
	105
	106	di->priv = drvc;
	107
	108	return SR_OK;
	109	}
	110
e93cdf42 BV	111	static GSList hw_scan(GSList options)
	112	{
	113	struct sr_dev_inst *sdi;
	114	struct drv_context *drvc;
	115	struct dev_context *devc;
	116	struct sr_hwopt *opt;
	117	struct sr_probe *probe;
	118	GSList l, devices;
	119	int len, fd, i;
	120	const char conn, serialcomm;
	121	char buf, *tokens;
	122
	123	drvc = di->priv;
	124	drvc->instances = NULL;
	125
	126	devices = NULL;
	127	conn = serialcomm = NULL;
	128	for (l = options; l; l = l->next) {
	129	opt = l->data;
	130	switch (opt->hwopt) {
	131	case SR_HWOPT_CONN:
	132	conn = opt->value;
	133	break;
	134	case SR_HWOPT_SERIALCOMM:
	135	serialcomm = opt->value;
	136	break;
	137	}
	138	}
74ac7d7f	139	if (!conn)
e93cdf42	140	return NULL;
e93cdf42 BV	141
e93cdf42 BV	142	if ((fd = serial_open(conn, O_RDWR\|O_NONBLOCK)) == -1) {
38d326e8	143	sr_err("Unable to open %s: %s.", conn, strerror(errno));
e93cdf42 BV	144	return NULL;
	145	}
	146
74ac7d7f BV	147	if (!serialcomm)
74ac7d7f BV	148	serialcomm = SERIALCOMM;
e93cdf42	149	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
38d326e8 UH	150	sr_err("Unable to set serial parameters: %s.",
38d326e8 UH	151	strerror(errno));
e93cdf42 BV	152	return NULL;
	153	}
	154
	155	serial_flush(fd);
	156	if (serial_write(fd, "*IDN?\r\n", 7) == -1) {
38d326e8 UH	157	sr_err("Unable to send identification string: %s.",
38d326e8 UH	158	strerror(errno));
e93cdf42 BV	159	return NULL;
	160	}
	161
	162	len = 128;
886a52b6 UH	163	if (!(buf = g_try_malloc(len))) {
	164	sr_err("Serial buffer malloc failed.");
	165	return NULL;
	166	}
63f7cb97	167	serial_readline(fd, &buf, &len, 150);
e93cdf42 BV	168	if (!len)
	169	return NULL;
	170
	171	tokens = g_strsplit(buf, ",", 4);
	172	if (!strcmp("Agilent Technologies", tokens[0])
	173	&& tokens[2] && tokens[3]) {
	174	for (i = 0; supported_agdmm[i].model; i++) {
	175	if (strcmp(supported_agdmm[i].modelname, tokens[1]))
	176	continue;
	177	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
	178	tokens[1], tokens[3])))
	179	return NULL;
	180	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
886a52b6	181	sr_err("Device context malloc failed.");
e93cdf42 BV	182	return NULL;
	183	}
	184	devc->profile = &supported_agdmm[i];
	185	devc->serial = sr_serial_dev_inst_new(conn, -1);
	186	devc->cur_mq = -1;
	187	sdi->priv = devc;
	188	sdi->driver = di;
	189	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	190	return NULL;
	191	sdi->probes = g_slist_append(sdi->probes, probe);
	192	drvc->instances = g_slist_append(drvc->instances, sdi);
	193	devices = g_slist_append(devices, sdi);
	194	break;
	195	}
	196	}
	197	g_strfreev(tokens);
	198	g_free(buf);
	199
	200	serial_close(fd);
	201
	202	return devices;
	203	}
	204
	205	static GSList *hw_dev_list(void)
	206	{
	207	struct drv_context *drvc;
	208
	209	drvc = di->priv;
	210
	211	return drvc->instances;
	212	}
	213
	214	static int hw_dev_open(struct sr_dev_inst *sdi)
	215	{
	216	struct dev_context *devc;
	217
	218	if (!(devc = sdi->priv)) {
38d326e8	219	sr_err("sdi->priv was NULL.");
e93cdf42 BV	220	return SR_ERR_BUG;
	221	}
	222
	223	devc->serial->fd = serial_open(devc->serial->port, O_RDWR \| O_NONBLOCK);
	224	if (devc->serial->fd == -1) {
38d326e8	225	sr_err("Couldn't open serial port '%s'.",
e93cdf42 BV	226	devc->serial->port);
	227	return SR_ERR;
	228	}
74ac7d7f	229	serial_set_paramstr(devc->serial->fd, SERIALCOMM);
e93cdf42 BV	230	sdi->status = SR_ST_ACTIVE;
	231
	232	return SR_OK;
	233	}
	234
	235	static int hw_dev_close(struct sr_dev_inst *sdi)
	236	{
	237	struct dev_context *devc;
	238
	239	if (!(devc = sdi->priv)) {
38d326e8	240	sr_err("sdi->priv was NULL.");
e93cdf42 BV	241	return SR_ERR_BUG;
	242	}
	243
	244	if (devc->serial && devc->serial->fd != -1) {
	245	serial_close(devc->serial->fd);
	246	devc->serial->fd = -1;
	247	sdi->status = SR_ST_INACTIVE;
	248	}
	249
	250	return SR_OK;
	251	}
	252
	253	static int hw_cleanup(void)
	254	{
	255
	256	clear_instances();
	257
	258	return SR_OK;
	259	}
	260
	261	static int hw_info_get(int info_id, const void **data,
	262	const struct sr_dev_inst *sdi)
	263	{
	264
	265	(void)sdi;
	266
	267	switch (info_id) {
	268	case SR_DI_HWOPTS:
	269	*data = hwopts;
	270	break;
	271	case SR_DI_HWCAPS:
	272	*data = hwcaps;
	273	break;
	274	case SR_DI_NUM_PROBES:
	275	*data = GINT_TO_POINTER(1);
	276	break;
	277	case SR_DI_PROBE_NAMES:
	278	*data = probe_names;
	279	break;
	280	default:
	281	return SR_ERR_ARG;
	282	}
	283
	284	return SR_OK;
	285	}
	286
	287	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	288	const void *value)
	289	{
	290	struct dev_context *devc;
	291
	292	if (sdi->status != SR_ST_ACTIVE)
	293	return SR_ERR;
	294
	295	if (!(devc = sdi->priv)) {
38d326e8	296	sr_err("sdi->priv was NULL.");
e93cdf42 BV	297	return SR_ERR_BUG;
	298	}
	299
	300	switch (hwcap) {
	301	case SR_HWCAP_LIMIT_MSEC:
	302	/* TODO: not yet implemented */
	303	if ((const uint64_t )value == 0) {
38d326e8	304	sr_err("LIMIT_MSEC can't be 0.");
e93cdf42 BV	305	return SR_ERR;
	306	}
	307	devc->limit_msec = (const uint64_t )value;
38d326e8	308	sr_dbg("Setting time limit to %" PRIu64 "ms.",
e93cdf42 BV	309	devc->limit_msec);
	310	break;
	311	case SR_HWCAP_LIMIT_SAMPLES:
	312	devc->limit_samples = (const uint64_t )value;
38d326e8	313	sr_dbg("Setting sample limit to %" PRIu64 ".",
e93cdf42 BV	314	devc->limit_samples);
	315	break;
	316	default:
38d326e8	317	sr_err("Unknown capability: %d.", hwcap);
e93cdf42 BV	318	return SR_ERR;
	319	break;
	320	}
	321
	322	return SR_OK;
	323	}
	324
	325	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	326	void *cb_data)
	327	{
	328	struct sr_datafeed_packet packet;
	329	struct sr_datafeed_header header;
	330	struct sr_datafeed_meta_analog meta;
	331	struct dev_context *devc;
	332
	333	if (!(devc = sdi->priv)) {
38d326e8	334	sr_err("sdi->priv was NULL.");
e93cdf42 BV	335	return SR_ERR_BUG;
	336	}
	337
38d326e8	338	sr_dbg("Starting acquisition.");
e93cdf42 BV	339
	340	devc->cb_data = cb_data;
	341
	342	/* Send header packet to the session bus. */
38d326e8	343	sr_dbg("Sending SR_DF_HEADER.");
e93cdf42 BV	344	packet.type = SR_DF_HEADER;
	345	packet.payload = (uint8_t *)&header;
	346	header.feed_version = 1;
	347	gettimeofday(&header.starttime, NULL);
	348	sr_session_send(devc->cb_data, &packet);
	349
	350	/* Send metadata about the SR_DF_ANALOG packets to come. */
38d326e8	351	sr_dbg("Sending SR_DF_META_ANALOG.");
e93cdf42 BV	352	packet.type = SR_DF_META_ANALOG;
	353	packet.payload = &meta;
	354	meta.num_probes = 1;
	355	sr_session_send(devc->cb_data, &packet);
	356
	357	/* Poll every 100ms, or whenever some data comes in. */
	358	sr_source_add(devc->serial->fd, G_IO_IN, 100, agdmm_receive_data, (void *)sdi);
	359
	360	return SR_OK;
	361	}
	362
69b07d14	363	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
e93cdf42 BV	364	{
	365	struct sr_datafeed_packet packet;
	366	struct dev_context *devc;
	367
	368	if (sdi->status != SR_ST_ACTIVE)
	369	return SR_ERR;
	370
	371	if (!(devc = sdi->priv)) {
38d326e8	372	sr_err("sdi->priv was NULL.");
e93cdf42 BV	373	return SR_ERR_BUG;
	374	}
	375
38d326e8	376	sr_dbg("Stopping acquisition.");
e93cdf42 BV	377
	378	sr_source_remove(devc->serial->fd);
	379	hw_dev_close((struct sr_dev_inst *)sdi);
	380
	381	/* Send end packet to the session bus. */
38d326e8	382	sr_dbg("Sending SR_DF_END.");
e93cdf42 BV	383	packet.type = SR_DF_END;
	384	sr_session_send(cb_data, &packet);
	385
	386
	387	return SR_OK;
	388	}
	389
	390	SR_PRIV struct sr_dev_driver agdmm_driver_info = {
	391	.name = "agilent-dmm",
	392	.longname = "Agilent U12xx series DMMs",
	393	.api_version = 1,
	394	.init = hw_init,
	395	.cleanup = hw_cleanup,
	396	.scan = hw_scan,
	397	.dev_list = hw_dev_list,
	398	.dev_clear = clear_instances,
	399	.dev_open = hw_dev_open,
	400	.dev_close = hw_dev_close,
	401	.info_get = hw_info_get,
	402	.dev_config_set = hw_dev_config_set,
	403	.dev_acquisition_start = hw_dev_acquisition_start,
	404	.dev_acquisition_stop = hw_dev_acquisition_stop,
	405	.priv = NULL,
	406	};