[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[];

static const struct agdmm_profile supported_agdmm[] = {
	{ AGILENT_U1231A, "U1231A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1232A, "U1232A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1233A, "U1233A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1251A, "U1251A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ AGILENT_U1252A, "U1252A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ AGILENT_U1253A, "U1253A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ 0, NULL, 0, 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;
	}

	di->priv = drvc;

	return SR_OK;
}

/* TODO: Merge into serial_readline() from serial.c. */
static int serial_readline2(int fd, char **buf, int *buflen, uint64_t timeout_ms)
{
	uint64_t start;
	int maxlen, len;

	timeout_ms *= 1000;
	start = g_get_monotonic_time();

	maxlen = *buflen;
	*buflen = len = 0;
	while(1) {
		len = maxlen - *buflen - 1;
		if (len < 1)
			break;
		len = serial_read(fd, *buf + *buflen, len);
		if (len > 0) {
			*buflen += len;
			*(*buf + *buflen) = '\0';
			if (*buflen > 0 && *(*buf + *buflen - 1) == '\n')
				/* End of line */
				break;
		}
		if (g_get_monotonic_time() - start > timeout_ms)
			/* Timeout */
			break;
		g_usleep(2000);
	}

	/* Strip CRLF */
	while (*buflen) {
		if (*(*buf + *buflen - 1) == '\r' || *(*buf + *buflen - 1) == '\n')
			*(*buf + --*buflen) = '\0';
		else
			break;
	}
	if (*buflen)
		sr_dbg("Received '%s'.", *buf);

	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 || !serialcomm)
		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 (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;
	buf = g_try_malloc(len);
	serial_readline2(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_dbg("failed to malloc devc");
				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_params(devc->serial->fd, devc->profile->serial_speed, 8,
			SERIAL_PARITY_NONE, 1, 0);
	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(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 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 BV	53
e93cdf42 BV	54	static const struct agdmm_profile supported_agdmm[] = {
b186aa78	55	{ AGILENT_U1231A, "U1231A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
8c0152f2	56	{ AGILENT_U1232A, "U1232A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
b186aa78 BV	57	{ AGILENT_U1233A, "U1233A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	58	{ AGILENT_U1251A, "U1251A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	59	{ AGILENT_U1252A, "U1252A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	60	{ AGILENT_U1253A, "U1253A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
e93cdf42 BV	61	{ 0, NULL, 0, NULL, NULL }
	62	};
	63
	64	SR_PRIV struct sr_dev_driver agdmm_driver_info;
	65	static struct sr_dev_driver *di = &agdmm_driver_info;
	66
	67	/* Properly close and free all devices. */
	68	static int clear_instances(void)
	69	{
	70	struct sr_dev_inst *sdi;
	71	struct drv_context *drvc;
	72	struct dev_context *devc;
	73	GSList *l;
	74
	75	if (!(drvc = di->priv))
	76	return SR_OK;
	77
	78	drvc = di->priv;
	79	for (l = drvc->instances; l; l = l->next) {
	80	if (!(sdi = l->data))
	81	continue;
	82	if (!(devc = sdi->priv))
	83	continue;
	84	sr_serial_dev_inst_free(devc->serial);
	85	sr_dev_inst_free(sdi);
	86	}
	87	g_slist_free(drvc->instances);
	88	drvc->instances = NULL;
	89
	90	return SR_OK;
	91	}
	92
	93	static int hw_init(void)
	94	{
	95	struct drv_context *drvc;
	96
	97	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
38d326e8	98	sr_err("Driver context malloc failed.");
e93cdf42 BV	99	return SR_ERR;
	100	}
	101
	102	di->priv = drvc;
	103
	104	return SR_OK;
	105	}
	106
6f22a8ef UH	107	/* TODO: Merge into serial_readline() from serial.c. */
6f22a8ef UH	108	static int serial_readline2(int fd, char *buf, int buflen, uint64_t timeout_ms)
e93cdf42 BV	109	{
	110	uint64_t start;
	111	int maxlen, len;
	112
	113	timeout_ms *= 1000;
	114	start = g_get_monotonic_time();
	115
	116	maxlen = *buflen;
	117	*buflen = len = 0;
	118	while(1) {
	119	len = maxlen - *buflen - 1;
	120	if (len < 1)
	121	break;
	122	len = serial_read(fd, buf + buflen, len);
	123	if (len > 0) {
	124	*buflen += len;
	125	(buf + *buflen) = '\0';
	126	if (buflen > 0 && (buf + buflen - 1) == '\n')
	127	/* End of line */
	128	break;
	129	}
	130	if (g_get_monotonic_time() - start > timeout_ms)
	131	/* Timeout */
	132	break;
	133	g_usleep(2000);
	134	}
	135
	136	/* Strip CRLF */
	137	while (*buflen) {
	138	if ((buf + buflen - 1) == '\r' \|\| (buf + buflen - 1) == '\n')
	139	(buf + --*buflen) = '\0';
	140	else
	141	break;
	142	}
	143	if (*buflen)
38d326e8	144	sr_dbg("Received '%s'.", *buf);
e93cdf42 BV	145
	146	return SR_OK;
	147	}
	148
	149	static GSList hw_scan(GSList options)
	150	{
	151	struct sr_dev_inst *sdi;
	152	struct drv_context *drvc;
	153	struct dev_context *devc;
	154	struct sr_hwopt *opt;
	155	struct sr_probe *probe;
	156	GSList l, devices;
	157	int len, fd, i;
	158	const char conn, serialcomm;
	159	char buf, *tokens;
	160
	161	drvc = di->priv;
	162	drvc->instances = NULL;
	163
	164	devices = NULL;
	165	conn = serialcomm = NULL;
	166	for (l = options; l; l = l->next) {
	167	opt = l->data;
	168	switch (opt->hwopt) {
	169	case SR_HWOPT_CONN:
	170	conn = opt->value;
	171	break;
	172	case SR_HWOPT_SERIALCOMM:
	173	serialcomm = opt->value;
	174	break;
	175	}
	176	}
c2016fa0	177	if (!conn \|\| !serialcomm)
e93cdf42	178	return NULL;
e93cdf42 BV	179
e93cdf42 BV	180	if ((fd = serial_open(conn, O_RDWR\|O_NONBLOCK)) == -1) {
38d326e8	181	sr_err("Unable to open %s: %s.", conn, strerror(errno));
e93cdf42 BV	182	return NULL;
	183	}
	184
	185	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
38d326e8 UH	186	sr_err("Unable to set serial parameters: %s.",
38d326e8 UH	187	strerror(errno));
e93cdf42 BV	188	return NULL;
	189	}
	190
	191	serial_flush(fd);
	192	if (serial_write(fd, "*IDN?\r\n", 7) == -1) {
38d326e8 UH	193	sr_err("Unable to send identification string: %s.",
38d326e8 UH	194	strerror(errno));
e93cdf42 BV	195	return NULL;
	196	}
	197
	198	len = 128;
	199	buf = g_try_malloc(len);
6f22a8ef	200	serial_readline2(fd, &buf, &len, 150);
e93cdf42 BV	201	if (!len)
	202	return NULL;
	203
	204	tokens = g_strsplit(buf, ",", 4);
	205	if (!strcmp("Agilent Technologies", tokens[0])
	206	&& tokens[2] && tokens[3]) {
	207	for (i = 0; supported_agdmm[i].model; i++) {
	208	if (strcmp(supported_agdmm[i].modelname, tokens[1]))
	209	continue;
	210	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
	211	tokens[1], tokens[3])))
	212	return NULL;
	213	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
38d326e8	214	sr_dbg("failed to malloc devc");
e93cdf42 BV	215	return NULL;
	216	}
	217	devc->profile = &supported_agdmm[i];
	218	devc->serial = sr_serial_dev_inst_new(conn, -1);
	219	devc->cur_mq = -1;
	220	sdi->priv = devc;
	221	sdi->driver = di;
	222	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	223	return NULL;
	224	sdi->probes = g_slist_append(sdi->probes, probe);
	225	drvc->instances = g_slist_append(drvc->instances, sdi);
	226	devices = g_slist_append(devices, sdi);
	227	break;
	228	}
	229	}
	230	g_strfreev(tokens);
	231	g_free(buf);
	232
	233	serial_close(fd);
	234
	235	return devices;
	236	}
	237
	238	static GSList *hw_dev_list(void)
	239	{
	240	struct drv_context *drvc;
	241
	242	drvc = di->priv;
	243
	244	return drvc->instances;
	245	}
	246
	247	static int hw_dev_open(struct sr_dev_inst *sdi)
	248	{
	249	struct dev_context *devc;
	250
	251	if (!(devc = sdi->priv)) {
38d326e8	252	sr_err("sdi->priv was NULL.");
e93cdf42 BV	253	return SR_ERR_BUG;
	254	}
	255
	256	devc->serial->fd = serial_open(devc->serial->port, O_RDWR \| O_NONBLOCK);
	257	if (devc->serial->fd == -1) {
38d326e8	258	sr_err("Couldn't open serial port '%s'.",
e93cdf42 BV	259	devc->serial->port);
	260	return SR_ERR;
	261	}
	262	serial_set_params(devc->serial->fd, devc->profile->serial_speed, 8,
	263	SERIAL_PARITY_NONE, 1, 0);
	264	sdi->status = SR_ST_ACTIVE;
	265
	266	return SR_OK;
	267	}
	268
	269	static int hw_dev_close(struct sr_dev_inst *sdi)
	270	{
	271	struct dev_context *devc;
	272
	273	if (!(devc = sdi->priv)) {
38d326e8	274	sr_err("sdi->priv was NULL.");
e93cdf42 BV	275	return SR_ERR_BUG;
	276	}
	277
	278	if (devc->serial && devc->serial->fd != -1) {
	279	serial_close(devc->serial->fd);
	280	devc->serial->fd = -1;
	281	sdi->status = SR_ST_INACTIVE;
	282	}
	283
	284	return SR_OK;
	285	}
	286
	287	static int hw_cleanup(void)
	288	{
	289
	290	clear_instances();
	291
	292	return SR_OK;
	293	}
	294
	295	static int hw_info_get(int info_id, const void **data,
	296	const struct sr_dev_inst *sdi)
	297	{
	298
	299	(void)sdi;
	300
	301	switch (info_id) {
	302	case SR_DI_HWOPTS:
	303	*data = hwopts;
	304	break;
	305	case SR_DI_HWCAPS:
	306	*data = hwcaps;
	307	break;
	308	case SR_DI_NUM_PROBES:
	309	*data = GINT_TO_POINTER(1);
	310	break;
	311	case SR_DI_PROBE_NAMES:
	312	*data = probe_names;
	313	break;
	314	default:
	315	return SR_ERR_ARG;
	316	}
	317
	318	return SR_OK;
	319	}
	320
	321	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	322	const void *value)
	323	{
	324	struct dev_context *devc;
	325
	326	if (sdi->status != SR_ST_ACTIVE)
	327	return SR_ERR;
	328
	329	if (!(devc = sdi->priv)) {
38d326e8	330	sr_err("sdi->priv was NULL.");
e93cdf42 BV	331	return SR_ERR_BUG;
	332	}
	333
	334	switch (hwcap) {
	335	case SR_HWCAP_LIMIT_MSEC:
	336	/* TODO: not yet implemented */
	337	if ((const uint64_t )value == 0) {
38d326e8	338	sr_err("LIMIT_MSEC can't be 0.");
e93cdf42 BV	339	return SR_ERR;
	340	}
	341	devc->limit_msec = (const uint64_t )value;
38d326e8	342	sr_dbg("Setting time limit to %" PRIu64 "ms.",
e93cdf42 BV	343	devc->limit_msec);
	344	break;
	345	case SR_HWCAP_LIMIT_SAMPLES:
	346	devc->limit_samples = (const uint64_t )value;
38d326e8	347	sr_dbg("Setting sample limit to %" PRIu64 ".",
e93cdf42 BV	348	devc->limit_samples);
	349	break;
	350	default:
38d326e8	351	sr_err("Unknown capability: %d.", hwcap);
e93cdf42 BV	352	return SR_ERR;
	353	break;
	354	}
	355
	356	return SR_OK;
	357	}
	358
	359	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	360	void *cb_data)
	361	{
	362	struct sr_datafeed_packet packet;
	363	struct sr_datafeed_header header;
	364	struct sr_datafeed_meta_analog meta;
	365	struct dev_context *devc;
	366
	367	if (!(devc = sdi->priv)) {
38d326e8	368	sr_err("sdi->priv was NULL.");
e93cdf42 BV	369	return SR_ERR_BUG;
	370	}
	371
38d326e8	372	sr_dbg("Starting acquisition.");
e93cdf42 BV	373
	374	devc->cb_data = cb_data;
	375
	376	/* Send header packet to the session bus. */
38d326e8	377	sr_dbg("Sending SR_DF_HEADER.");
e93cdf42 BV	378	packet.type = SR_DF_HEADER;
	379	packet.payload = (uint8_t *)&header;
	380	header.feed_version = 1;
	381	gettimeofday(&header.starttime, NULL);
	382	sr_session_send(devc->cb_data, &packet);
	383
	384	/* Send metadata about the SR_DF_ANALOG packets to come. */
38d326e8	385	sr_dbg("Sending SR_DF_META_ANALOG.");
e93cdf42 BV	386	packet.type = SR_DF_META_ANALOG;
	387	packet.payload = &meta;
	388	meta.num_probes = 1;
	389	sr_session_send(devc->cb_data, &packet);
	390
	391	/* Poll every 100ms, or whenever some data comes in. */
	392	sr_source_add(devc->serial->fd, G_IO_IN, 100, agdmm_receive_data, (void *)sdi);
	393
	394	return SR_OK;
	395	}
	396
	397	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
	398	void *cb_data)
	399	{
	400	struct sr_datafeed_packet packet;
	401	struct dev_context *devc;
	402
	403	if (sdi->status != SR_ST_ACTIVE)
	404	return SR_ERR;
	405
	406	if (!(devc = sdi->priv)) {
38d326e8	407	sr_err("sdi->priv was NULL.");
e93cdf42 BV	408	return SR_ERR_BUG;
	409	}
	410
38d326e8	411	sr_dbg("Stopping acquisition.");
e93cdf42 BV	412
	413	sr_source_remove(devc->serial->fd);
	414	hw_dev_close((struct sr_dev_inst *)sdi);
	415
	416	/* Send end packet to the session bus. */
38d326e8	417	sr_dbg("Sending SR_DF_END.");
e93cdf42 BV	418	packet.type = SR_DF_END;
	419	sr_session_send(cb_data, &packet);
	420
	421
	422	return SR_OK;
	423	}
	424
	425	SR_PRIV struct sr_dev_driver agdmm_driver_info = {
	426	.name = "agilent-dmm",
	427	.longname = "Agilent U12xx series DMMs",
	428	.api_version = 1,
	429	.init = hw_init,
	430	.cleanup = hw_cleanup,
	431	.scan = hw_scan,
	432	.dev_list = hw_dev_list,
	433	.dev_clear = clear_instances,
	434	.dev_open = hw_dev_open,
	435	.dev_close = hw_dev_close,
	436	.info_get = hw_info_get,
	437	.dev_config_set = hw_dev_config_set,
	438	.dev_acquisition_start = hw_dev_acquisition_start,
	439	.dev_acquisition_stop = hw_dev_acquisition_stop,
	440	.priv = NULL,
	441	};