[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_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_U1232A, "U1231A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1232A, "U1232A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1232A, "U1233A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	{ AGILENT_U1232A, "U1251A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ AGILENT_U1232A, "U1252A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	{ AGILENT_U1232A, "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("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
8c0152f2 BV	50	extern const struct agdmm_job agdmm_jobs_u123x[];
	51	extern const struct agdmm_recv agdmm_recvs_u123x[];
	52	extern const struct agdmm_job agdmm_jobs_u125x[];
	53	extern const struct agdmm_recv agdmm_recvs_u125x[];
e93cdf42 BV	54
e93cdf42 BV	55	static const struct agdmm_profile supported_agdmm[] = {
8c0152f2 BV	56	{ AGILENT_U1232A, "U1231A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	57	{ AGILENT_U1232A, "U1232A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	58	{ AGILENT_U1232A, "U1233A", 9600, agdmm_jobs_u123x, agdmm_recvs_u123x },
	59	{ AGILENT_U1232A, "U1251A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	60	{ AGILENT_U1232A, "U1252A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
	61	{ AGILENT_U1232A, "U1253A", 9600, agdmm_jobs_u125x, agdmm_recvs_u125x },
e93cdf42 BV	62	{ 0, NULL, 0, NULL, NULL }
	63	};
	64
	65	SR_PRIV struct sr_dev_driver agdmm_driver_info;
	66	static struct sr_dev_driver *di = &agdmm_driver_info;
	67
	68	/* Properly close and free all devices. */
	69	static int clear_instances(void)
	70	{
	71	struct sr_dev_inst *sdi;
	72	struct drv_context *drvc;
	73	struct dev_context *devc;
	74	GSList *l;
	75
	76	if (!(drvc = di->priv))
	77	return SR_OK;
	78
	79	drvc = di->priv;
	80	for (l = drvc->instances; l; l = l->next) {
	81	if (!(sdi = l->data))
	82	continue;
	83	if (!(devc = sdi->priv))
	84	continue;
	85	sr_serial_dev_inst_free(devc->serial);
	86	sr_dev_inst_free(sdi);
	87	}
	88	g_slist_free(drvc->instances);
	89	drvc->instances = NULL;
	90
	91	return SR_OK;
	92	}
	93
	94	static int hw_init(void)
	95	{
	96	struct drv_context *drvc;
	97
	98	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	99	sr_err("agilent-dmm: driver context malloc failed.");
	100	return SR_ERR;
	101	}
	102
	103	di->priv = drvc;
	104
	105	return SR_OK;
	106	}
	107
	108	static int serial_readline(int fd, char *buf, int buflen, uint64_t timeout_ms)
	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)
144	sr_dbg("agilent-dmm: received '%s'", *buf);
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	}
177	if (!conn) {
178	sr_dbg("no serial port provided");
179	return NULL;
180	}
181	if (!serialcomm) {
182	sr_dbg("no serial communication parameters provided");
183	return NULL;
184	}
185
186	if ((fd = serial_open(conn, O_RDWR\|O_NONBLOCK)) == -1) {
187	sr_err("agilent-dmm: unable to open %s: %s", conn, strerror(errno));
188	return NULL;
189	}
190
191	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
192	sr_err("agilent-dmm: unable to set serial parameters: %s",
193	strerror(errno));
194	return NULL;
195	}
196
197	serial_flush(fd);
198	if (serial_write(fd, "*IDN?\r\n", 7) == -1) {
199	sr_err("agilent-dmm: unable to send identification string: %s",
200	strerror(errno));
201	return NULL;
202	}
203
204	len = 128;
205	buf = g_try_malloc(len);
206	serial_readline(fd, &buf, &len, 150);
207	if (!len)
208	return NULL;
209
210	tokens = g_strsplit(buf, ",", 4);
211	if (!strcmp("Agilent Technologies", tokens[0])
212	&& tokens[2] && tokens[3]) {
213	for (i = 0; supported_agdmm[i].model; i++) {
214	if (strcmp(supported_agdmm[i].modelname, tokens[1]))
215	continue;
216	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, tokens[0],
217	tokens[1], tokens[3])))
218	return NULL;
219	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
220	sr_dbg("agilent-dmm: failed to malloc devc");
221	return NULL;
222	}
223	devc->profile = &supported_agdmm[i];
224	devc->serial = sr_serial_dev_inst_new(conn, -1);
225	devc->cur_mq = -1;
226	sdi->priv = devc;
227	sdi->driver = di;
228	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
229	return NULL;
230	sdi->probes = g_slist_append(sdi->probes, probe);
231	drvc->instances = g_slist_append(drvc->instances, sdi);
232	devices = g_slist_append(devices, sdi);
233	break;
234	}
235	}
236	g_strfreev(tokens);
237	g_free(buf);
238
239	serial_close(fd);
240
241	return devices;
242	}
243
244	static GSList *hw_dev_list(void)
245	{
246	struct drv_context *drvc;
247
248	drvc = di->priv;
249
250	return drvc->instances;
251	}
252
253	static int hw_dev_open(struct sr_dev_inst *sdi)
254	{
255	struct dev_context *devc;
256
257	if (!(devc = sdi->priv)) {
258	sr_err("agilent-dmm: sdi->priv was NULL.");
259	return SR_ERR_BUG;
260	}
261
262	devc->serial->fd = serial_open(devc->serial->port, O_RDWR \| O_NONBLOCK);
263	if (devc->serial->fd == -1) {
264	sr_err("agilent-dmm: Couldn't open serial port '%s'.",
265	devc->serial->port);
266	return SR_ERR;
267	}
268	serial_set_params(devc->serial->fd, devc->profile->serial_speed, 8,
269	SERIAL_PARITY_NONE, 1, 0);
270	sdi->status = SR_ST_ACTIVE;
271
272	return SR_OK;
273	}
274
275	static int hw_dev_close(struct sr_dev_inst *sdi)
276	{
277	struct dev_context *devc;
278
279	if (!(devc = sdi->priv)) {
280	sr_err("agilent-dmm: sdi->priv was NULL.");
281	return SR_ERR_BUG;
282	}
283
284	if (devc->serial && devc->serial->fd != -1) {
285	serial_close(devc->serial->fd);
286	devc->serial->fd = -1;
287	sdi->status = SR_ST_INACTIVE;
288	}
289
290	return SR_OK;
291	}
292
293	static int hw_cleanup(void)
294	{
295
296	clear_instances();
297
298	return SR_OK;
299	}
300
301	static int hw_info_get(int info_id, const void **data,
302	const struct sr_dev_inst *sdi)
303	{
304
305	(void)sdi;
306
307	switch (info_id) {
308	case SR_DI_HWOPTS:
309	*data = hwopts;
310	break;
311	case SR_DI_HWCAPS:
312	*data = hwcaps;
313	break;
314	case SR_DI_NUM_PROBES:
315	*data = GINT_TO_POINTER(1);
316	break;
317	case SR_DI_PROBE_NAMES:
318	*data = probe_names;
319	break;
320	default:
321	return SR_ERR_ARG;
322	}
323
324	return SR_OK;
325	}
326
327	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
328	const void *value)
329	{
330	struct dev_context *devc;
331
332	if (sdi->status != SR_ST_ACTIVE)
333	return SR_ERR;
334
335	if (!(devc = sdi->priv)) {
336	sr_err("agilent-dmm: sdi->priv was NULL.");
337	return SR_ERR_BUG;
338	}
339
340	switch (hwcap) {
341	case SR_HWCAP_LIMIT_MSEC:
342	/* TODO: not yet implemented */
343	if ((const uint64_t )value == 0) {
344	sr_err("agilent-dmm: LIMIT_MSEC can't be 0.");
345	return SR_ERR;
346	}
347	devc->limit_msec = (const uint64_t )value;
348	sr_dbg("agilent-dmm: Setting time limit to %" PRIu64 "ms.",
349	devc->limit_msec);
350	break;
351	case SR_HWCAP_LIMIT_SAMPLES:
352	devc->limit_samples = (const uint64_t )value;
353	sr_dbg("agilent-dmm: Setting sample limit to %" PRIu64 ".",
354	devc->limit_samples);
355	break;
356	default:
357	sr_err("agilent-dmm: Unknown capability: %d.", hwcap);
358	return SR_ERR;
359	break;
360	}
361
362	return SR_OK;
363	}
364
365	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
366	void *cb_data)
367	{
368	struct sr_datafeed_packet packet;
369	struct sr_datafeed_header header;
370	struct sr_datafeed_meta_analog meta;
371	struct dev_context *devc;
372
373	if (!(devc = sdi->priv)) {
374	sr_err("agilent-dmm: sdi->priv was NULL.");
375	return SR_ERR_BUG;
376	}
377
378	sr_dbg("agilent-dmm: Starting acquisition.");
379
380	devc->cb_data = cb_data;
381
382	/* Send header packet to the session bus. */
383	sr_dbg("agilent-dmm: Sending SR_DF_HEADER.");
384	packet.type = SR_DF_HEADER;
385	packet.payload = (uint8_t *)&header;
386	header.feed_version = 1;
387	gettimeofday(&header.starttime, NULL);
388	sr_session_send(devc->cb_data, &packet);
389
390	/* Send metadata about the SR_DF_ANALOG packets to come. */
391	sr_dbg("agilent-dmm: Sending SR_DF_META_ANALOG.");
392	packet.type = SR_DF_META_ANALOG;
393	packet.payload = &meta;
394	meta.num_probes = 1;
395	sr_session_send(devc->cb_data, &packet);
396
397	/* Poll every 100ms, or whenever some data comes in. */
398	sr_source_add(devc->serial->fd, G_IO_IN, 100, agdmm_receive_data, (void *)sdi);
399
400	return SR_OK;
401	}
402
403	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
404	void *cb_data)
405	{
406	struct sr_datafeed_packet packet;
407	struct dev_context *devc;
408
409	if (sdi->status != SR_ST_ACTIVE)
410	return SR_ERR;
411
412	if (!(devc = sdi->priv)) {
413	sr_err("agilent-dmm: sdi->priv was NULL.");
414	return SR_ERR_BUG;
415	}
416
417	sr_dbg("agilent-dmm: Stopping acquisition.");
418
419	sr_source_remove(devc->serial->fd);
420	hw_dev_close((struct sr_dev_inst *)sdi);
421
422	/* Send end packet to the session bus. */
423	sr_dbg("agilent-dmm: Sending SR_DF_END.");
424	packet.type = SR_DF_END;
425	sr_session_send(cb_data, &packet);
426
427
428	return SR_OK;
429	}
430
431	SR_PRIV struct sr_dev_driver agdmm_driver_info = {
432	.name = "agilent-dmm",
433	.longname = "Agilent U12xx series DMMs",
434	.api_version = 1,
435	.init = hw_init,
436	.cleanup = hw_cleanup,
437	.scan = hw_scan,
438	.dev_list = hw_dev_list,
439	.dev_clear = clear_instances,
440	.dev_open = hw_dev_open,
441	.dev_close = hw_dev_close,
442	.info_get = hw_info_get,
443	.dev_config_set = hw_dev_config_set,
444	.dev_acquisition_start = hw_dev_acquisition_start,
445	.dev_acquisition_stop = hw_dev_acquisition_stop,
446	.priv = NULL,
447	};