[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 "libsigrok.h"
#include "libsigrok-internal.h"
#include "config.h"
#include "agilent-dmm.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.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_u123x_jobs[];
extern const struct agdmm_recv agdmm_recvs[];

static const struct agdmm_profile supported_agdmm[] = {
	{ AGILENT_U1232A, "U1232A", 9600, agdmm_u123x_jobs, agdmm_recvs },
	{ 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("agilent-dmm: driver context malloc failed.");
		return SR_ERR;
	}

	di->priv = drvc;

	return SR_OK;
}

static int serial_readline(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("agilent-dmm: 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) {
		sr_dbg("no serial port provided");
		return NULL;
	}
	if (!serialcomm) {
		sr_dbg("no serial communication parameters provided");
		return NULL;
	}

	if ((fd = serial_open(conn, O_RDWR|O_NONBLOCK)) == -1) {
		sr_err("agilent-dmm: unable to open %s: %s", conn, strerror(errno));
		return NULL;
	}

	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
		sr_err("agilent-dmm: unable to set serial parameters: %s",
				strerror(errno));
		return NULL;
	}

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

	len = 128;
	buf = g_try_malloc(len);
	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_dbg("agilent-dmm: 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("agilent-dmm: 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("agilent-dmm: 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("agilent-dmm: 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("agilent-dmm: 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("agilent-dmm: LIMIT_MSEC can't be 0.");
			return SR_ERR;
		}
		devc->limit_msec = *(const uint64_t *)value;
		sr_dbg("agilent-dmm: Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	case SR_HWCAP_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		sr_dbg("agilent-dmm: Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("agilent-dmm: 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("agilent-dmm: sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("agilent-dmm: Starting acquisition.");

	devc->cb_data = cb_data;

	/* Send header packet to the session bus. */
	sr_dbg("agilent-dmm: 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("agilent-dmm: 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("agilent-dmm: sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("agilent-dmm: 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("agilent-dmm: 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>
	21	#include "libsigrok.h"
	22	#include "libsigrok-internal.h"
	23	#include "config.h"
	24	#include "agilent-dmm.h"
	25	#include <sys/types.h>
	26	#include <sys/stat.h>
	27	#include <fcntl.h>
	28	#include <string.h>
	29	#include <errno.h>
	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_LIMIT_MSEC,
	41	SR_HWCAP_CONTINUOUS,
	42	0,
	43	};
	44
	45	static const char *probe_names[] = {
	46	"Probe",
	47	NULL,
	48	};
	49
a4394fb3 BV	50	extern const struct agdmm_job agdmm_u123x_jobs[];
a4394fb3 BV	51	extern const struct agdmm_recv agdmm_recvs[];
e93cdf42 BV	52
e93cdf42 BV	53	static const struct agdmm_profile supported_agdmm[] = {
a4394fb3	54	{ AGILENT_U1232A, "U1232A", 9600, agdmm_u123x_jobs, agdmm_recvs },
e93cdf42 BV	55	{ 0, NULL, 0, NULL, NULL }
	56	};
	57
	58	SR_PRIV struct sr_dev_driver agdmm_driver_info;
	59	static struct sr_dev_driver *di = &agdmm_driver_info;
	60
	61	/* Properly close and free all devices. */
	62	static int clear_instances(void)
	63	{
	64	struct sr_dev_inst *sdi;
	65	struct drv_context *drvc;
	66	struct dev_context *devc;
	67	GSList *l;
	68
	69	if (!(drvc = di->priv))
	70	return SR_OK;
	71
	72	drvc = di->priv;
	73	for (l = drvc->instances; l; l = l->next) {
	74	if (!(sdi = l->data))
	75	continue;
	76	if (!(devc = sdi->priv))
	77	continue;
	78	sr_serial_dev_inst_free(devc->serial);
	79	sr_dev_inst_free(sdi);
	80	}
	81	g_slist_free(drvc->instances);
	82	drvc->instances = NULL;
	83
	84	return SR_OK;
	85	}
	86
	87	static int hw_init(void)
	88	{
	89	struct drv_context *drvc;
	90
	91	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	92	sr_err("agilent-dmm: driver context malloc failed.");
	93	return SR_ERR;
	94	}
	95
	96	di->priv = drvc;
	97
	98	return SR_OK;
	99	}
	100
	101	static int serial_readline(int fd, char *buf, int buflen, uint64_t timeout_ms)
	102	{
	103	uint64_t start;
	104	int maxlen, len;
	105
	106	timeout_ms *= 1000;
	107	start = g_get_monotonic_time();
	108
	109	maxlen = *buflen;
	110	*buflen = len = 0;
	111	while(1) {
	112	len = maxlen - *buflen - 1;
	113	if (len < 1)
	114	break;
	115	len = serial_read(fd, buf + buflen, len);
	116	if (len > 0) {
	117	*buflen += len;
	118	(buf + *buflen) = '\0';
119	if (buflen > 0 && (buf + buflen - 1) == '\n')
120	/* End of line */
121	break;
122	}
123	if (g_get_monotonic_time() - start > timeout_ms)
124	/* Timeout */
125	break;
126	g_usleep(2000);
127	}
128
129	/* Strip CRLF */
130	while (*buflen) {
131	if ((buf + buflen - 1) == '\r' \|\| (buf + buflen - 1) == '\n')
132	(buf + --*buflen) = '\0';
133	else
134	break;
135	}
136	if (*buflen)
137	sr_dbg("agilent-dmm: received '%s'", *buf);
138
139	return SR_OK;
140	}
141
142	static GSList hw_scan(GSList options)
143	{
144	struct sr_dev_inst *sdi;
145	struct drv_context *drvc;
146	struct dev_context *devc;
147	struct sr_hwopt *opt;
148	struct sr_probe *probe;
149	GSList l, devices;
150	int len, fd, i;
151	const char conn, serialcomm;
152	char buf, *tokens;
153
154	drvc = di->priv;
155	drvc->instances = NULL;
156
157	devices = NULL;
158	conn = serialcomm = NULL;
159	for (l = options; l; l = l->next) {
160	opt = l->data;
161	switch (opt->hwopt) {
162	case SR_HWOPT_CONN:
163	conn = opt->value;
164	break;
165	case SR_HWOPT_SERIALCOMM:
166	serialcomm = opt->value;
167	break;
168	}
169	}
170	if (!conn) {
171	sr_dbg("no serial port provided");
172	return NULL;
173	}
174	if (!serialcomm) {
175	sr_dbg("no serial communication parameters provided");
176	return NULL;
177	}
178
179	if ((fd = serial_open(conn, O_RDWR\|O_NONBLOCK)) == -1) {
180	sr_err("agilent-dmm: unable to open %s: %s", conn, strerror(errno));
181	return NULL;
182	}
183
184	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
185	sr_err("agilent-dmm: unable to set serial parameters: %s",
186	strerror(errno));
187	return NULL;
188	}
189
190	serial_flush(fd);
191	if (serial_write(fd, "*IDN?\r\n", 7) == -1) {
192	sr_err("agilent-dmm: unable to send identification string: %s",
193	strerror(errno));
194	return NULL;
195	}
196
197	len = 128;
198	buf = g_try_malloc(len);
199	serial_readline(fd, &buf, &len, 150);
200	if (!len)
201	return NULL;
202
203	tokens = g_strsplit(buf, ",", 4);
204	if (!strcmp("Agilent Technologies", tokens[0])
205	&& tokens[2] && tokens[3]) {
206	for (i = 0; supported_agdmm[i].model; i++) {
207	if (strcmp(supported_agdmm[i].modelname, tokens[1]))
208	continue;
209	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
210	tokens[1], tokens[3])))
211	return NULL;
212	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
213	sr_dbg("agilent-dmm: failed to malloc devc");
214	return NULL;
215	}
216	devc->profile = &supported_agdmm[i];
217	devc->serial = sr_serial_dev_inst_new(conn, -1);
218	devc->cur_mq = -1;
219	sdi->priv = devc;
220	sdi->driver = di;
221	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
222	return NULL;
223	sdi->probes = g_slist_append(sdi->probes, probe);
224	drvc->instances = g_slist_append(drvc->instances, sdi);
225	devices = g_slist_append(devices, sdi);
226	break;
227	}
228	}
229	g_strfreev(tokens);
230	g_free(buf);
231
232	serial_close(fd);
233
234	return devices;
235	}
236
237	static GSList *hw_dev_list(void)
238	{
239	struct drv_context *drvc;
240
241	drvc = di->priv;
242
243	return drvc->instances;
244	}
245
246	static int hw_dev_open(struct sr_dev_inst *sdi)
247	{
248	struct dev_context *devc;
249
250	if (!(devc = sdi->priv)) {
251	sr_err("agilent-dmm: sdi->priv was NULL.");
252	return SR_ERR_BUG;
253	}
254
255	devc->serial->fd = serial_open(devc->serial->port, O_RDWR \| O_NONBLOCK);
256	if (devc->serial->fd == -1) {
257	sr_err("agilent-dmm: Couldn't open serial port '%s'.",
258	devc->serial->port);
259	return SR_ERR;
260	}
261	serial_set_params(devc->serial->fd, devc->profile->serial_speed, 8,
262	SERIAL_PARITY_NONE, 1, 0);
263	sdi->status = SR_ST_ACTIVE;
264
265	return SR_OK;
266	}
267
268	static int hw_dev_close(struct sr_dev_inst *sdi)
269	{
270	struct dev_context *devc;
271
272	if (!(devc = sdi->priv)) {
273	sr_err("agilent-dmm: sdi->priv was NULL.");
274	return SR_ERR_BUG;
275	}
276
277	if (devc->serial && devc->serial->fd != -1) {
278	serial_close(devc->serial->fd);
279	devc->serial->fd = -1;
280	sdi->status = SR_ST_INACTIVE;
281	}
282
283	return SR_OK;
284	}
285
286	static int hw_cleanup(void)
287	{
288
289	clear_instances();
290
291	return SR_OK;
292	}
293
294	static int hw_info_get(int info_id, const void **data,
295	const struct sr_dev_inst *sdi)
296	{
297
298	(void)sdi;
299
300	switch (info_id) {
301	case SR_DI_HWOPTS:
302	*data = hwopts;
303	break;
304	case SR_DI_HWCAPS:
305	*data = hwcaps;
306	break;
307	case SR_DI_NUM_PROBES:
308	*data = GINT_TO_POINTER(1);
309	break;
310	case SR_DI_PROBE_NAMES:
311	*data = probe_names;
312	break;
313	default:
314	return SR_ERR_ARG;
315	}
316
317	return SR_OK;
318	}
319
320	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
321	const void *value)
322	{
323	struct dev_context *devc;
324
325	if (sdi->status != SR_ST_ACTIVE)
326	return SR_ERR;
327
328	if (!(devc = sdi->priv)) {
329	sr_err("agilent-dmm: sdi->priv was NULL.");
330	return SR_ERR_BUG;
331	}
332
333	switch (hwcap) {
334	case SR_HWCAP_LIMIT_MSEC:
335	/* TODO: not yet implemented */
336	if ((const uint64_t )value == 0) {
337	sr_err("agilent-dmm: LIMIT_MSEC can't be 0.");
338	return SR_ERR;
339	}
340	devc->limit_msec = (const uint64_t )value;
341	sr_dbg("agilent-dmm: Setting time limit to %" PRIu64 "ms.",
342	devc->limit_msec);
343	break;
344	case SR_HWCAP_LIMIT_SAMPLES:
345	devc->limit_samples = (const uint64_t )value;
346	sr_dbg("agilent-dmm: Setting sample limit to %" PRIu64 ".",
347	devc->limit_samples);
348	break;
349	default:
350	sr_err("agilent-dmm: Unknown capability: %d.", hwcap);
351	return SR_ERR;
352	break;
353	}
354
355	return SR_OK;
356	}
357
358	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
359	void *cb_data)
360	{
361	struct sr_datafeed_packet packet;
362	struct sr_datafeed_header header;
363	struct sr_datafeed_meta_analog meta;
364	struct dev_context *devc;
365
366	if (!(devc = sdi->priv)) {
367	sr_err("agilent-dmm: sdi->priv was NULL.");
368	return SR_ERR_BUG;
369	}
370
371	sr_dbg("agilent-dmm: Starting acquisition.");
372
373	devc->cb_data = cb_data;
374
375	/* Send header packet to the session bus. */
376	sr_dbg("agilent-dmm: Sending SR_DF_HEADER.");
377	packet.type = SR_DF_HEADER;
378	packet.payload = (uint8_t *)&header;
379	header.feed_version = 1;
380	gettimeofday(&header.starttime, NULL);
381	sr_session_send(devc->cb_data, &packet);
382
383	/* Send metadata about the SR_DF_ANALOG packets to come. */
384	sr_dbg("agilent-dmm: Sending SR_DF_META_ANALOG.");
385	packet.type = SR_DF_META_ANALOG;
386	packet.payload = &meta;
387	meta.num_probes = 1;
388	sr_session_send(devc->cb_data, &packet);
389
390	/* Poll every 100ms, or whenever some data comes in. */
391	sr_source_add(devc->serial->fd, G_IO_IN, 100, agdmm_receive_data, (void *)sdi);
392
393	return SR_OK;
394	}
395
396	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
397	void *cb_data)
398	{
399	struct sr_datafeed_packet packet;
400	struct dev_context *devc;
401
402	if (sdi->status != SR_ST_ACTIVE)
403	return SR_ERR;
404
405	if (!(devc = sdi->priv)) {
406	sr_err("agilent-dmm: sdi->priv was NULL.");
407	return SR_ERR_BUG;
408	}
409
410	sr_dbg("agilent-dmm: Stopping acquisition.");
411
412	sr_source_remove(devc->serial->fd);
413	hw_dev_close((struct sr_dev_inst *)sdi);
414
415	/* Send end packet to the session bus. */
416	sr_dbg("agilent-dmm: Sending SR_DF_END.");
417	packet.type = SR_DF_END;
418	sr_session_send(cb_data, &packet);
419
420
421	return SR_OK;
422	}
423
424	SR_PRIV struct sr_dev_driver agdmm_driver_info = {
425	.name = "agilent-dmm",
426	.longname = "Agilent U12xx series DMMs",
427	.api_version = 1,
428	.init = hw_init,
429	.cleanup = hw_cleanup,
430	.scan = hw_scan,
431	.dev_list = hw_dev_list,
432	.dev_clear = clear_instances,
433	.dev_open = hw_dev_open,
434	.dev_close = hw_dev_close,
435	.info_get = hw_info_get,
436	.dev_config_set = hw_dev_config_set,
437	.dev_acquisition_start = hw_dev_acquisition_start,
438	.dev_acquisition_stop = hw_dev_acquisition_stop,
439	.priv = NULL,
440	};