[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,
};

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;
	}

	drvc->sr_ctx = sr_ctx;
	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;
	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
8c0152f2 BV	44	extern const struct agdmm_job agdmm_jobs_u123x[];
	45	extern const struct agdmm_recv agdmm_recvs_u123x[];
	46	extern const struct agdmm_job agdmm_jobs_u125x[];
	47	extern const struct agdmm_recv agdmm_recvs_u125x[];
e93cdf42	48
74ac7d7f BV	49	/* This works on all the Agilent U12xxA series, although the
	50	* U127xA can apparently also run at 19200/8n1. */
	51	#define SERIALCOMM "9600/8n1"
	52
e93cdf42	53	static const struct agdmm_profile supported_agdmm[] = {
74ac7d7f BV	54	{ AGILENT_U1231A, "U1231A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	55	{ AGILENT_U1232A, "U1232A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	56	{ AGILENT_U1233A, "U1233A", agdmm_jobs_u123x, agdmm_recvs_u123x },
	57	{ AGILENT_U1251A, "U1251A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	58	{ AGILENT_U1252A, "U1252A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	59	{ AGILENT_U1253A, "U1253A", agdmm_jobs_u125x, agdmm_recvs_u125x },
	60	{ 0, NULL, NULL, NULL }
e93cdf42 BV	61	};
	62
	63	SR_PRIV struct sr_dev_driver agdmm_driver_info;
	64	static struct sr_dev_driver *di = &agdmm_driver_info;
	65
	66	/* Properly close and free all devices. */
	67	static int clear_instances(void)
	68	{
	69	struct sr_dev_inst *sdi;
	70	struct drv_context *drvc;
	71	struct dev_context *devc;
	72	GSList *l;
	73
	74	if (!(drvc = di->priv))
	75	return SR_OK;
	76
	77	drvc = di->priv;
	78	for (l = drvc->instances; l; l = l->next) {
	79	if (!(sdi = l->data))
	80	continue;
	81	if (!(devc = sdi->priv))
	82	continue;
	83	sr_serial_dev_inst_free(devc->serial);
	84	sr_dev_inst_free(sdi);
	85	}
	86	g_slist_free(drvc->instances);
	87	drvc->instances = NULL;
	88
	89	return SR_OK;
	90	}
	91
34f06b90	92	static int hw_init(struct sr_context *sr_ctx)
e93cdf42 BV	93	{
	94	struct drv_context *drvc;
	95
	96	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
38d326e8	97	sr_err("Driver context malloc failed.");
886a52b6	98	return SR_ERR_MALLOC;
e93cdf42 BV	99	}
e93cdf42 BV	100
1ebe4b4e	101	drvc->sr_ctx = sr_ctx;
e93cdf42 BV	102	di->priv = drvc;
	103
	104	return SR_OK;
	105	}
	106
e93cdf42 BV	107	static GSList hw_scan(GSList options)
	108	{
	109	struct sr_dev_inst *sdi;
	110	struct drv_context *drvc;
	111	struct dev_context *devc;
	112	struct sr_hwopt *opt;
	113	struct sr_probe *probe;
109a3ba4	114	struct sr_serial_dev_inst *serial;
e93cdf42	115	GSList l, devices;
109a3ba4	116	int len, i;
e93cdf42 BV	117	const char conn, serialcomm;
	118	char buf, *tokens;
	119
	120	drvc = di->priv;
	121	drvc->instances = NULL;
	122
	123	devices = NULL;
	124	conn = serialcomm = NULL;
	125	for (l = options; l; l = l->next) {
	126	opt = l->data;
	127	switch (opt->hwopt) {
	128	case SR_HWOPT_CONN:
	129	conn = opt->value;
	130	break;
	131	case SR_HWOPT_SERIALCOMM:
	132	serialcomm = opt->value;
	133	break;
	134	}
	135	}
74ac7d7f	136	if (!conn)
e93cdf42	137	return NULL;
109a3ba4 BV	138	if (!serialcomm)
109a3ba4 BV	139	serialcomm = SERIALCOMM;
e93cdf42	140
109a3ba4	141	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
e93cdf42	142	return NULL;
e93cdf42	143
a54dd31e	144	if (serial_open(serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
e93cdf42	145	return NULL;
e93cdf42	146
109a3ba4 BV	147	serial_flush(serial);
109a3ba4 BV	148	if (serial_write(serial, "*IDN?\r\n", 7) == -1) {
38d326e8 UH	149	sr_err("Unable to send identification string: %s.",
38d326e8 UH	150	strerror(errno));
e93cdf42 BV	151	return NULL;
	152	}
	153
	154	len = 128;
886a52b6 UH	155	if (!(buf = g_try_malloc(len))) {
	156	sr_err("Serial buffer malloc failed.");
	157	return NULL;
	158	}
109a3ba4	159	serial_readline(serial, &buf, &len, 150);
e93cdf42 BV	160	if (!len)
	161	return NULL;
	162
	163	tokens = g_strsplit(buf, ",", 4);
	164	if (!strcmp("Agilent Technologies", tokens[0])
	165	&& tokens[2] && tokens[3]) {
	166	for (i = 0; supported_agdmm[i].model; i++) {
	167	if (strcmp(supported_agdmm[i].modelname, tokens[1]))
	168	continue;
	169	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
	170	tokens[1], tokens[3])))
	171	return NULL;
	172	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
886a52b6	173	sr_err("Device context malloc failed.");
e93cdf42 BV	174	return NULL;
	175	}
	176	devc->profile = &supported_agdmm[i];
109a3ba4	177	devc->serial = serial;
e93cdf42 BV	178	devc->cur_mq = -1;
	179	sdi->priv = devc;
	180	sdi->driver = di;
	181	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	182	return NULL;
	183	sdi->probes = g_slist_append(sdi->probes, probe);
	184	drvc->instances = g_slist_append(drvc->instances, sdi);
	185	devices = g_slist_append(devices, sdi);
	186	break;
	187	}
	188	}
	189	g_strfreev(tokens);
	190	g_free(buf);
	191
109a3ba4 BV	192	serial_close(serial);
	193	if (!devices)
	194	sr_serial_dev_inst_free(serial);
e93cdf42 BV	195
	196	return devices;
	197	}
	198
	199	static GSList *hw_dev_list(void)
	200	{
	201	struct drv_context *drvc;
	202
	203	drvc = di->priv;
	204
	205	return drvc->instances;
	206	}
	207
	208	static int hw_dev_open(struct sr_dev_inst *sdi)
	209	{
	210	struct dev_context *devc;
	211
	212	if (!(devc = sdi->priv)) {
38d326e8	213	sr_err("sdi->priv was NULL.");
e93cdf42 BV	214	return SR_ERR_BUG;
	215	}
	216
a54dd31e	217	if (serial_open(devc->serial, SERIAL_RDWR \| SERIAL_NONBLOCK) != SR_OK)
e93cdf42	218	return SR_ERR;
109a3ba4	219
e93cdf42 BV	220	sdi->status = SR_ST_ACTIVE;
	221
	222	return SR_OK;
	223	}
	224
	225	static int hw_dev_close(struct sr_dev_inst *sdi)
	226	{
	227	struct dev_context *devc;
	228
	229	if (!(devc = sdi->priv)) {
38d326e8	230	sr_err("sdi->priv was NULL.");
e93cdf42 BV	231	return SR_ERR_BUG;
	232	}
	233
	234	if (devc->serial && devc->serial->fd != -1) {
109a3ba4	235	serial_close(devc->serial);
e93cdf42 BV	236	sdi->status = SR_ST_INACTIVE;
	237	}
	238
	239	return SR_OK;
	240	}
	241
	242	static int hw_cleanup(void)
	243	{
	244
	245	clear_instances();
	246
	247	return SR_OK;
	248	}
	249
	250	static int hw_info_get(int info_id, const void **data,
	251	const struct sr_dev_inst *sdi)
	252	{
e93cdf42 BV	253	(void)sdi;
	254
	255	switch (info_id) {
	256	case SR_DI_HWOPTS:
	257	*data = hwopts;
	258	break;
	259	case SR_DI_HWCAPS:
	260	*data = hwcaps;
	261	break;
e93cdf42 BV	262	default:
	263	return SR_ERR_ARG;
	264	}
	265
	266	return SR_OK;
	267	}
	268
	269	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	270	const void *value)
	271	{
	272	struct dev_context *devc;
	273
	274	if (sdi->status != SR_ST_ACTIVE)
	275	return SR_ERR;
	276
	277	if (!(devc = sdi->priv)) {
38d326e8	278	sr_err("sdi->priv was NULL.");
e93cdf42 BV	279	return SR_ERR_BUG;
	280	}
	281
	282	switch (hwcap) {
	283	case SR_HWCAP_LIMIT_MSEC:
	284	/* TODO: not yet implemented */
	285	if ((const uint64_t )value == 0) {
38d326e8	286	sr_err("LIMIT_MSEC can't be 0.");
e93cdf42 BV	287	return SR_ERR;
	288	}
	289	devc->limit_msec = (const uint64_t )value;
38d326e8	290	sr_dbg("Setting time limit to %" PRIu64 "ms.",
e93cdf42 BV	291	devc->limit_msec);
	292	break;
	293	case SR_HWCAP_LIMIT_SAMPLES:
	294	devc->limit_samples = (const uint64_t )value;
38d326e8	295	sr_dbg("Setting sample limit to %" PRIu64 ".",
e93cdf42 BV	296	devc->limit_samples);
	297	break;
	298	default:
38d326e8	299	sr_err("Unknown capability: %d.", hwcap);
e93cdf42 BV	300	return SR_ERR;
	301	break;
	302	}
	303
	304	return SR_OK;
	305	}
	306
	307	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	308	void *cb_data)
	309	{
	310	struct sr_datafeed_packet packet;
	311	struct sr_datafeed_header header;
	312	struct sr_datafeed_meta_analog meta;
	313	struct dev_context *devc;
	314
	315	if (!(devc = sdi->priv)) {
38d326e8	316	sr_err("sdi->priv was NULL.");
e93cdf42 BV	317	return SR_ERR_BUG;
	318	}
	319
38d326e8	320	sr_dbg("Starting acquisition.");
e93cdf42 BV	321
	322	devc->cb_data = cb_data;
	323
	324	/* Send header packet to the session bus. */
38d326e8	325	sr_dbg("Sending SR_DF_HEADER.");
e93cdf42 BV	326	packet.type = SR_DF_HEADER;
	327	packet.payload = (uint8_t *)&header;
	328	header.feed_version = 1;
	329	gettimeofday(&header.starttime, NULL);
	330	sr_session_send(devc->cb_data, &packet);
	331
	332	/* Send metadata about the SR_DF_ANALOG packets to come. */
38d326e8	333	sr_dbg("Sending SR_DF_META_ANALOG.");
e93cdf42 BV	334	packet.type = SR_DF_META_ANALOG;
	335	packet.payload = &meta;
	336	meta.num_probes = 1;
	337	sr_session_send(devc->cb_data, &packet);
	338
	339	/* Poll every 100ms, or whenever some data comes in. */
	340	sr_source_add(devc->serial->fd, G_IO_IN, 100, agdmm_receive_data, (void *)sdi);
	341
	342	return SR_OK;
	343	}
	344
69b07d14	345	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
e93cdf42 BV	346	{
	347	struct sr_datafeed_packet packet;
	348	struct dev_context *devc;
	349
	350	if (sdi->status != SR_ST_ACTIVE)
	351	return SR_ERR;
	352
	353	if (!(devc = sdi->priv)) {
38d326e8	354	sr_err("sdi->priv was NULL.");
e93cdf42 BV	355	return SR_ERR_BUG;
	356	}
	357
38d326e8	358	sr_dbg("Stopping acquisition.");
e93cdf42 BV	359
	360	sr_source_remove(devc->serial->fd);
	361	hw_dev_close((struct sr_dev_inst *)sdi);
	362
	363	/* Send end packet to the session bus. */
38d326e8	364	sr_dbg("Sending SR_DF_END.");
e93cdf42 BV	365	packet.type = SR_DF_END;
	366	sr_session_send(cb_data, &packet);
	367
	368
	369	return SR_OK;
	370	}
	371
	372	SR_PRIV struct sr_dev_driver agdmm_driver_info = {
	373	.name = "agilent-dmm",
	374	.longname = "Agilent U12xx series DMMs",
	375	.api_version = 1,
	376	.init = hw_init,
	377	.cleanup = hw_cleanup,
	378	.scan = hw_scan,
	379	.dev_list = hw_dev_list,
	380	.dev_clear = clear_instances,
	381	.dev_open = hw_dev_open,
	382	.dev_close = hw_dev_close,
	383	.info_get = hw_info_get,
	384	.dev_config_set = hw_dev_config_set,
	385	.dev_acquisition_start = hw_dev_acquisition_start,
	386	.dev_acquisition_stop = hw_dev_acquisition_stop,
	387	.priv = NULL,
	388	};