[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(struct sr_context *sr_ctx)
{
	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;
	struct sr_serial_dev_inst *serial;
	GSList *l, *devices;
	int len, 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 (!serialcomm)
		serialcomm = SERIALCOMM;

	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
		return NULL;

	if (serial_open(serial, SERIAL_RDWR | SERIAL_NONBLOCK) != SR_OK)
		return NULL;

	serial_flush(serial);
	if (serial_write(serial, "*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(serial, &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 = serial;
			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(serial);
	if (!devices)
		sr_serial_dev_inst_free(serial);

	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, SERIAL_RDWR | SERIAL_NONBLOCK) != 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:
		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
34f06b90	97	static int hw_init(struct sr_context *sr_ctx)
e93cdf42 BV	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;
109a3ba4	118	struct sr_serial_dev_inst *serial;
e93cdf42	119	GSList l, devices;
109a3ba4	120	int len, i;
e93cdf42 BV	121	const char conn, serialcomm;
	122	char buf, *tokens;
	123
	124	drvc = di->priv;
	125	drvc->instances = NULL;
	126
	127	devices = NULL;
	128	conn = serialcomm = NULL;
	129	for (l = options; l; l = l->next) {
	130	opt = l->data;
	131	switch (opt->hwopt) {
	132	case SR_HWOPT_CONN:
	133	conn = opt->value;
	134	break;
	135	case SR_HWOPT_SERIALCOMM:
	136	serialcomm = opt->value;
	137	break;
	138	}
	139	}
74ac7d7f	140	if (!conn)
e93cdf42	141	return NULL;
109a3ba4 BV	142	if (!serialcomm)
109a3ba4 BV	143	serialcomm = SERIALCOMM;
e93cdf42	144
109a3ba4	145	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
e93cdf42	146	return NULL;
e93cdf42	147
a54dd31e	148	if (serial_open(serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
e93cdf42	149	return NULL;
e93cdf42	150
109a3ba4 BV	151	serial_flush(serial);
109a3ba4 BV	152	if (serial_write(serial, "*IDN?\r\n", 7) == -1) {
38d326e8 UH	153	sr_err("Unable to send identification string: %s.",
38d326e8 UH	154	strerror(errno));
e93cdf42 BV	155	return NULL;
	156	}
	157
	158	len = 128;
886a52b6 UH	159	if (!(buf = g_try_malloc(len))) {
	160	sr_err("Serial buffer malloc failed.");
	161	return NULL;
	162	}
109a3ba4	163	serial_readline(serial, &buf, &len, 150);
e93cdf42 BV	164	if (!len)
	165	return NULL;
	166
	167	tokens = g_strsplit(buf, ",", 4);
	168	if (!strcmp("Agilent Technologies", tokens[0])
	169	&& tokens[2] && tokens[3]) {
	170	for (i = 0; supported_agdmm[i].model; i++) {
	171	if (strcmp(supported_agdmm[i].modelname, tokens[1]))
	172	continue;
	173	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
	174	tokens[1], tokens[3])))
	175	return NULL;
	176	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
886a52b6	177	sr_err("Device context malloc failed.");
e93cdf42 BV	178	return NULL;
	179	}
	180	devc->profile = &supported_agdmm[i];
109a3ba4	181	devc->serial = serial;
e93cdf42 BV	182	devc->cur_mq = -1;
	183	sdi->priv = devc;
	184	sdi->driver = di;
	185	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	186	return NULL;
	187	sdi->probes = g_slist_append(sdi->probes, probe);
	188	drvc->instances = g_slist_append(drvc->instances, sdi);
	189	devices = g_slist_append(devices, sdi);
	190	break;
	191	}
	192	}
	193	g_strfreev(tokens);
	194	g_free(buf);
	195
109a3ba4 BV	196	serial_close(serial);
	197	if (!devices)
	198	sr_serial_dev_inst_free(serial);
e93cdf42 BV	199
	200	return devices;
	201	}
	202
	203	static GSList *hw_dev_list(void)
	204	{
	205	struct drv_context *drvc;
	206
	207	drvc = di->priv;
	208
	209	return drvc->instances;
	210	}
	211
	212	static int hw_dev_open(struct sr_dev_inst *sdi)
	213	{
	214	struct dev_context *devc;
	215
	216	if (!(devc = sdi->priv)) {
38d326e8	217	sr_err("sdi->priv was NULL.");
e93cdf42 BV	218	return SR_ERR_BUG;
	219	}
	220
a54dd31e	221	if (serial_open(devc->serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
e93cdf42	222	return SR_ERR;
109a3ba4	223
e93cdf42 BV	224	sdi->status = SR_ST_ACTIVE;
	225
	226	return SR_OK;
	227	}
	228
	229	static int hw_dev_close(struct sr_dev_inst *sdi)
	230	{
	231	struct dev_context *devc;
	232
	233	if (!(devc = sdi->priv)) {
38d326e8	234	sr_err("sdi->priv was NULL.");
e93cdf42 BV	235	return SR_ERR_BUG;
	236	}
	237
	238	if (devc->serial && devc->serial->fd != -1) {
109a3ba4	239	serial_close(devc->serial);
e93cdf42 BV	240	sdi->status = SR_ST_INACTIVE;
	241	}
	242
	243	return SR_OK;
	244	}
	245
	246	static int hw_cleanup(void)
	247	{
	248
	249	clear_instances();
	250
	251	return SR_OK;
	252	}
	253
	254	static int hw_info_get(int info_id, const void **data,
	255	const struct sr_dev_inst *sdi)
	256	{
	257
	258	(void)sdi;
	259
	260	switch (info_id) {
	261	case SR_DI_HWOPTS:
	262	*data = hwopts;
	263	break;
	264	case SR_DI_HWCAPS:
	265	*data = hwcaps;
	266	break;
	267	case SR_DI_NUM_PROBES:
	268	*data = GINT_TO_POINTER(1);
	269	break;
	270	case SR_DI_PROBE_NAMES:
	271	*data = probe_names;
	272	break;
	273	default:
	274	return SR_ERR_ARG;
	275	}
	276
	277	return SR_OK;
	278	}
	279
	280	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	281	const void *value)
	282	{
	283	struct dev_context *devc;
	284
	285	if (sdi->status != SR_ST_ACTIVE)
	286	return SR_ERR;
	287
	288	if (!(devc = sdi->priv)) {
38d326e8	289	sr_err("sdi->priv was NULL.");
e93cdf42 BV	290	return SR_ERR_BUG;
	291	}
	292
	293	switch (hwcap) {
	294	case SR_HWCAP_LIMIT_MSEC:
	295	/* TODO: not yet implemented */
	296	if ((const uint64_t )value == 0) {
38d326e8	297	sr_err("LIMIT_MSEC can't be 0.");
e93cdf42 BV	298	return SR_ERR;
	299	}
	300	devc->limit_msec = (const uint64_t )value;
38d326e8	301	sr_dbg("Setting time limit to %" PRIu64 "ms.",
e93cdf42 BV	302	devc->limit_msec);
	303	break;
	304	case SR_HWCAP_LIMIT_SAMPLES:
	305	devc->limit_samples = (const uint64_t )value;
38d326e8	306	sr_dbg("Setting sample limit to %" PRIu64 ".",
e93cdf42 BV	307	devc->limit_samples);
	308	break;
	309	default:
38d326e8	310	sr_err("Unknown capability: %d.", hwcap);
e93cdf42 BV	311	return SR_ERR;
	312	break;
	313	}
	314
	315	return SR_OK;
	316	}
	317
	318	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	319	void *cb_data)
	320	{
	321	struct sr_datafeed_packet packet;
	322	struct sr_datafeed_header header;
	323	struct sr_datafeed_meta_analog meta;
	324	struct dev_context *devc;
	325
	326	if (!(devc = sdi->priv)) {
38d326e8	327	sr_err("sdi->priv was NULL.");
e93cdf42 BV	328	return SR_ERR_BUG;
	329	}
	330
38d326e8	331	sr_dbg("Starting acquisition.");
e93cdf42 BV	332
	333	devc->cb_data = cb_data;
	334
	335	/* Send header packet to the session bus. */
38d326e8	336	sr_dbg("Sending SR_DF_HEADER.");
e93cdf42 BV	337	packet.type = SR_DF_HEADER;
	338	packet.payload = (uint8_t *)&header;
	339	header.feed_version = 1;
	340	gettimeofday(&header.starttime, NULL);
	341	sr_session_send(devc->cb_data, &packet);
	342
	343	/* Send metadata about the SR_DF_ANALOG packets to come. */
38d326e8	344	sr_dbg("Sending SR_DF_META_ANALOG.");
e93cdf42 BV	345	packet.type = SR_DF_META_ANALOG;
	346	packet.payload = &meta;
	347	meta.num_probes = 1;
	348	sr_session_send(devc->cb_data, &packet);
	349
	350	/* Poll every 100ms, or whenever some data comes in. */
	351	sr_source_add(devc->serial->fd, G_IO_IN, 100, agdmm_receive_data, (void *)sdi);
	352
	353	return SR_OK;
	354	}
	355
69b07d14	356	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
e93cdf42 BV	357	{
	358	struct sr_datafeed_packet packet;
	359	struct dev_context *devc;
	360
	361	if (sdi->status != SR_ST_ACTIVE)
	362	return SR_ERR;
	363
	364	if (!(devc = sdi->priv)) {
38d326e8	365	sr_err("sdi->priv was NULL.");
e93cdf42 BV	366	return SR_ERR_BUG;
	367	}
	368
38d326e8	369	sr_dbg("Stopping acquisition.");
e93cdf42 BV	370
	371	sr_source_remove(devc->serial->fd);
	372	hw_dev_close((struct sr_dev_inst *)sdi);
	373
	374	/* Send end packet to the session bus. */
38d326e8	375	sr_dbg("Sending SR_DF_END.");
e93cdf42 BV	376	packet.type = SR_DF_END;
	377	sr_session_send(cb_data, &packet);
	378
	379
	380	return SR_OK;
	381	}
	382
	383	SR_PRIV struct sr_dev_driver agdmm_driver_info = {
	384	.name = "agilent-dmm",
	385	.longname = "Agilent U12xx series DMMs",
	386	.api_version = 1,
	387	.init = hw_init,
	388	.cleanup = hw_cleanup,
	389	.scan = hw_scan,
	390	.dev_list = hw_dev_list,
	391	.dev_clear = clear_instances,
	392	.dev_open = hw_dev_open,
	393	.dev_close = hw_dev_close,
	394	.info_get = hw_info_get,
	395	.dev_config_set = hw_dev_config_set,
	396	.dev_acquisition_start = hw_dev_acquisition_start,
	397	.dev_acquisition_stop = hw_dev_acquisition_stop,
	398	.priv = NULL,
	399	};