[libsigrok.git] / hardware / tekpower-dmm / api.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 "protocol.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_CONTINUOUS,
	0,
};

static const char *probe_names[] = {
	"Probe",
	NULL,
};

SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info;
static struct sr_dev_driver *di = &tekpower_dmm_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_MALLOC;
	}

	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, 1);
		if (len > 0) {
			*buflen += len;
			*(*buf + *buflen) = '\0';
			if (*buflen > 0 && *(*buf + *buflen - 1) == '\r') {
				/* Strip LF and terminate. */
				*(*buf + --*buflen) = '\0';
				break;
			}
		}
		if (g_get_monotonic_time() - start > timeout_ms)
			/* Timeout */
			break;
		g_usleep(2000);
	}

	return SR_OK;
}

static GSList *lcd14_scan(const char *conn, const char *serialcomm)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_probe *probe;
	struct lcd14_packet *packet;
	GSList *devices;
	int i, len, fd, retry, good_packets = 0, dropped, ret;
	char buf[128], *b;

	if ((fd = serial_open(conn, O_RDONLY | O_NONBLOCK)) == -1) {
		sr_err("Unable to open %s: %s.", conn, strerror(errno));
		return NULL;
	}
	if ((ret = serial_set_paramstr(fd, serialcomm)) != SR_OK) {
		sr_err("Unable to set serial parameters: %d", ret);
		return NULL;
	}

	sr_info("Probing port %s readonly.", conn);

	drvc = di->priv;
	b = buf;
	retry = 0;
	devices = NULL;
	serial_flush(fd);

	/*
	 * There's no way to get an ID from the multimeter. It just sends data
	 * periodically, so the best we can do is check if the packets match
	 * the expected format.
	 */
	while (!devices && retry < 3) {
		retry++;

		/* Let's get a bit of data and see if we can find a packet. */
		len = sizeof(buf);
		serial_readline(fd, &b, &len, 500);
		if ((len == 0) || (len < LCD14_PACKET_SIZE)) {
			/* Not enough data received, is the DMM connected? */
			continue;
		}

		/* Let's treat our buffer like a stream, and find any
		 * valid packets */
		for (i = 0; i < len - LCD14_PACKET_SIZE + 1;) {
			packet = (void *)(&buf[i]);
			if (!lcd14_is_packet_valid(packet, NULL)) {
				i++;
				continue;
			}
			good_packets++;
			i += LCD14_PACKET_SIZE;
		}

		/*
		 * If we dropped more than two packets worth of data,
		 * something is wrong.
		 */
		dropped = len - (good_packets * LCD14_PACKET_SIZE);
		if (dropped > 2 * LCD14_PACKET_SIZE)
			continue;

		/* Let's see if we have anything good. */
		if (good_packets == 0)
			continue;

		sr_info("Found device on port %s.", conn);

		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
					    "TP4000ZC", "")))
			return NULL;
		if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
			sr_err("Device context malloc failed.");
			return NULL;
		}

		devc->serial = sr_serial_dev_inst_new(conn, -1);
		devc->serialcomm = g_strdup(serialcomm);

		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;
	}

	serial_close(fd);
	return devices;
}

static GSList *hw_scan(GSList *options)
{
	struct sr_hwopt *opt;
	GSList *l, *devices;
	const char *conn, *serialcomm;

	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) {
		/* Use the provided comm specs. */
		devices = lcd14_scan(conn, serialcomm);
	} else {
		/* Try the default 2400/8n1. */
		devices = lcd14_scan(conn, "2400/8n1");
	}

	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)
{
	int ret;
	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_RDONLY);
	if (devc->serial->fd == -1) {
		sr_err("Couldn't open serial port '%s'.", devc->serial->port);
		return SR_ERR;
	}

	ret = serial_set_paramstr(devc->serial->fd, devc->serialcomm);
	if (ret != SR_OK) {
		sr_err("Unable to set serial parameters: %d.", ret);
		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->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_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;

	/*
	 * Reset the number of samples to take. If we've already collected our
	 * quota, but we start a new session, and don't reset this, we'll just
	 * quit without acquiring any new samples.
	 */
	devc->num_samples = 0;

	/* 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 50ms, or whenever some data comes in. */
	sr_source_add(devc->serial->fd, G_IO_IN, 50,
		      tekpower_dmm_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 tekpower_dmm_driver_info = {
	.name = "tekpower-dmm",
	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
	.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
7dc55d93 AG	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	5	* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include <glib.h>
7dc55d93 AG	22	#include <sys/types.h>
	23	#include <sys/stat.h>
	24	#include <fcntl.h>
	25	#include <string.h>
	26	#include <errno.h>
bbabddbd UH	27	#include "libsigrok.h"
	28	#include "libsigrok-internal.h"
	29	#include "protocol.h"
7dc55d93 AG	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_CONTINUOUS,
	41	0,
	42	};
	43
	44	static const char *probe_names[] = {
	45	"Probe",
	46	NULL,
	47	};
	48
bbabddbd UH	49	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info;
bbabddbd UH	50	static struct sr_dev_driver *di = &tekpower_dmm_driver_info;
7dc55d93 AG	51
	52	/* Properly close and free all devices. */
	53	static int clear_instances(void)
	54	{
	55	struct sr_dev_inst *sdi;
	56	struct drv_context *drvc;
	57	struct dev_context *devc;
	58	GSList *l;
	59
	60	if (!(drvc = di->priv))
	61	return SR_OK;
	62
	63	drvc = di->priv;
	64	for (l = drvc->instances; l; l = l->next) {
	65	if (!(sdi = l->data))
	66	continue;
	67	if (!(devc = sdi->priv))
	68	continue;
	69	sr_serial_dev_inst_free(devc->serial);
	70	sr_dev_inst_free(sdi);
	71	}
	72	g_slist_free(drvc->instances);
	73	drvc->instances = NULL;
	74
	75	return SR_OK;
	76	}
	77
	78	static int hw_init(void)
	79	{
	80	struct drv_context *drvc;
	81
	82	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
bbabddbd UH	83	sr_err("Driver context malloc failed.");
bbabddbd UH	84	return SR_ERR_MALLOC;
7dc55d93 AG	85	}
	86
	87	di->priv = drvc;
	88
	89	return SR_OK;
	90	}
	91
bbabddbd	92	static int serial_readline(int fd, char *buf, int buflen,
7dc55d93 AG	93	uint64_t timeout_ms)
	94	{
	95	uint64_t start;
	96	int maxlen, len;
	97
	98	timeout_ms *= 1000;
	99	start = g_get_monotonic_time();
	100
	101	maxlen = *buflen;
	102	*buflen = len = 0;
bbabddbd	103	while (1) {
7dc55d93 AG	104	len = maxlen - *buflen - 1;
	105	if (len < 1)
	106	break;
	107	len = serial_read(fd, buf + buflen, 1);
	108	if (len > 0) {
	109	*buflen += len;
	110	(buf + *buflen) = '\0';
	111	if (buflen > 0 && (buf + buflen - 1) == '\r') {
	112	/* Strip LF and terminate. */
	113	(buf + --*buflen) = '\0';
	114	break;
	115	}
	116	}
	117	if (g_get_monotonic_time() - start > timeout_ms)
	118	/* Timeout */
	119	break;
	120	g_usleep(2000);
	121	}
	122
	123	return SR_OK;
	124	}
	125
	126	static GSList lcd14_scan(const char conn, const char *serialcomm)
	127	{
	128	struct sr_dev_inst *sdi;
	129	struct drv_context *drvc;
	130	struct dev_context *devc;
	131	struct sr_probe *probe;
bbabddbd	132	struct lcd14_packet *packet;
7dc55d93	133	GSList *devices;
bbabddbd	134	int i, len, fd, retry, good_packets = 0, dropped, ret;
7dc55d93 AG	135	char buf[128], *b;
7dc55d93 AG	136
bbabddbd UH	137	if ((fd = serial_open(conn, O_RDONLY \| O_NONBLOCK)) == -1) {
bbabddbd UH	138	sr_err("Unable to open %s: %s.", conn, strerror(errno));
7dc55d93 AG	139	return NULL;
7dc55d93 AG	140	}
bbabddbd UH	141	if ((ret = serial_set_paramstr(fd, serialcomm)) != SR_OK) {
bbabddbd UH	142	sr_err("Unable to set serial parameters: %d", ret);
7dc55d93 AG	143	return NULL;
	144	}
	145
bbabddbd	146	sr_info("Probing port %s readonly.", conn);
7dc55d93 AG	147
	148	drvc = di->priv;
	149	b = buf;
	150	retry = 0;
	151	devices = NULL;
	152	serial_flush(fd);
bbabddbd UH	153
	154	/*
	155	* There's no way to get an ID from the multimeter. It just sends data
	156	* periodically, so the best we can do is check if the packets match
	157	* the expected format.
	158	*/
	159	while (!devices && retry < 3) {
7dc55d93 AG	160	retry++;
7dc55d93 AG	161
bbabddbd	162	/* Let's get a bit of data and see if we can find a packet. */
7dc55d93 AG	163	len = sizeof(buf);
7dc55d93 AG	164	serial_readline(fd, &b, &len, 500);
bbabddbd UH	165	if ((len == 0) \|\| (len < LCD14_PACKET_SIZE)) {
bbabddbd UH	166	/* Not enough data received, is the DMM connected? */
7dc55d93 AG	167	continue;
	168	}
	169
	170	/* Let's treat our buffer like a stream, and find any
	171	* valid packets */
bbabddbd UH	172	for (i = 0; i < len - LCD14_PACKET_SIZE + 1;) {
	173	packet = (void *)(&buf[i]);
	174	if (!lcd14_is_packet_valid(packet, NULL)) {
7dc55d93 AG	175	i++;
	176	continue;
	177	}
	178	good_packets++;
	179	i += LCD14_PACKET_SIZE;
	180	}
	181
bbabddbd UH	182	/*
	183	* If we dropped more than two packets worth of data,
	184	* something is wrong.
	185	*/
	186	dropped = len - (good_packets * LCD14_PACKET_SIZE);
	187	if (dropped > 2 * LCD14_PACKET_SIZE)
7dc55d93 AG	188	continue;
7dc55d93 AG	189
bbabddbd	190	/* Let's see if we have anything good. */
7dc55d93 AG	191	if (good_packets == 0)
	192	continue;
	193
bbabddbd	194	sr_info("Found device on port %s.", conn);
7dc55d93 AG	195
	196	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
	197	"TP4000ZC", "")))
	198	return NULL;
	199	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
bbabddbd	200	sr_err("Device context malloc failed.");
7dc55d93 AG	201	return NULL;
	202	}
	203
7dc55d93 AG	204	devc->serial = sr_serial_dev_inst_new(conn, -1);
	205	devc->serialcomm = g_strdup(serialcomm);
	206
	207	sdi->priv = devc;
	208	sdi->driver = di;
	209	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	210	return NULL;
	211	sdi->probes = g_slist_append(sdi->probes, probe);
	212	drvc->instances = g_slist_append(drvc->instances, sdi);
	213	devices = g_slist_append(devices, sdi);
	214	break;
	215	}
	216
	217	serial_close(fd);
	218	return devices;
	219	}
	220
	221	static GSList hw_scan(GSList options)
	222	{
	223	struct sr_hwopt *opt;
	224	GSList l, devices;
	225	const char conn, serialcomm;
	226
	227	conn = serialcomm = NULL;
	228	for (l = options; l; l = l->next) {
	229	opt = l->data;
	230	switch (opt->hwopt) {
	231	case SR_HWOPT_CONN:
	232	conn = opt->value;
	233	break;
	234	case SR_HWOPT_SERIALCOMM:
	235	serialcomm = opt->value;
	236	break;
	237	}
	238	}
	239	if (!conn)
	240	return NULL;
	241
	242	if (serialcomm) {
	243	/* Use the provided comm specs. */
	244	devices = lcd14_scan(conn, serialcomm);
	245	} else {
bbabddbd	246	/* Try the default 2400/8n1. */
7dc55d93 AG	247	devices = lcd14_scan(conn, "2400/8n1");
	248	}
	249
	250	return devices;
	251	}
	252
	253	static GSList *hw_dev_list(void)
	254	{
	255	struct drv_context *drvc;
	256
	257	drvc = di->priv;
	258
	259	return drvc->instances;
	260	}
	261
	262	static int hw_dev_open(struct sr_dev_inst *sdi)
	263	{
bbabddbd	264	int ret;
7dc55d93 AG	265	struct dev_context *devc;
	266
	267	if (!(devc = sdi->priv)) {
	268	sr_err("sdi->priv was NULL.");
	269	return SR_ERR_BUG;
	270	}
	271
	272	devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
	273	if (devc->serial->fd == -1) {
bbabddbd	274	sr_err("Couldn't open serial port '%s'.", devc->serial->port);
7dc55d93 AG	275	return SR_ERR;
7dc55d93 AG	276	}
bbabddbd UH	277
	278	ret = serial_set_paramstr(devc->serial->fd, devc->serialcomm);
	279	if (ret != SR_OK) {
	280	sr_err("Unable to set serial parameters: %d.", ret);
7dc55d93 AG	281	return SR_ERR;
	282	}
	283	sdi->status = SR_ST_ACTIVE;
	284
	285	return SR_OK;
	286	}
	287
	288	static int hw_dev_close(struct sr_dev_inst *sdi)
	289	{
	290	struct dev_context *devc;
	291
	292	if (!(devc = sdi->priv)) {
	293	sr_err("sdi->priv was NULL.");
	294	return SR_ERR_BUG;
	295	}
	296
	297	if (devc->serial && devc->serial->fd != -1) {
	298	serial_close(devc->serial->fd);
	299	devc->serial->fd = -1;
	300	sdi->status = SR_ST_INACTIVE;
	301	}
	302
	303	return SR_OK;
	304	}
	305
	306	static int hw_cleanup(void)
	307	{
	308	clear_instances();
	309
	310	return SR_OK;
	311	}
	312
	313	static int hw_info_get(int info_id, const void **data,
bbabddbd	314	const struct sr_dev_inst *sdi)
7dc55d93	315	{
bbabddbd	316	(void)sdi;
7dc55d93 AG	317
	318	switch (info_id) {
	319	case SR_DI_HWOPTS:
	320	*data = hwopts;
	321	break;
	322	case SR_DI_HWCAPS:
	323	*data = hwcaps;
	324	break;
	325	case SR_DI_NUM_PROBES:
	326	*data = GINT_TO_POINTER(1);
	327	break;
	328	case SR_DI_PROBE_NAMES:
	329	*data = probe_names;
	330	break;
	331	default:
	332	return SR_ERR_ARG;
	333	}
	334
	335	return SR_OK;
	336	}
	337
	338	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
bbabddbd	339	const void *value)
7dc55d93 AG	340	{
	341	struct dev_context *devc;
	342
	343	if (sdi->status != SR_ST_ACTIVE)
	344	return SR_ERR;
	345
	346	if (!(devc = sdi->priv)) {
	347	sr_err("sdi->priv was NULL.");
	348	return SR_ERR_BUG;
	349	}
	350
	351	switch (hwcap) {
	352	case SR_HWCAP_LIMIT_SAMPLES:
	353	devc->limit_samples = (const uint64_t )value;
	354	sr_dbg("Setting sample limit to %" PRIu64 ".",
	355	devc->limit_samples);
	356	break;
	357	default:
	358	sr_err("Unknown capability: %d.", hwcap);
	359	return SR_ERR;
	360	break;
	361	}
	362
	363	return SR_OK;
	364	}
	365
	366	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
bbabddbd	367	void *cb_data)
7dc55d93 AG	368	{
	369	struct sr_datafeed_packet packet;
	370	struct sr_datafeed_header header;
	371	struct sr_datafeed_meta_analog meta;
	372	struct dev_context *devc;
	373
	374	if (!(devc = sdi->priv)) {
	375	sr_err("sdi->priv was NULL.");
	376	return SR_ERR_BUG;
	377	}
	378
	379	sr_dbg("Starting acquisition.");
	380
	381	devc->cb_data = cb_data;
	382
bbabddbd UH	383	/*
bbabddbd UH	384	* Reset the number of samples to take. If we've already collected our
7dc55d93	385	* quota, but we start a new session, and don't reset this, we'll just
bbabddbd UH	386	* quit without acquiring any new samples.
bbabddbd UH	387	*/
7dc55d93 AG	388	devc->num_samples = 0;
	389
	390	/* Send header packet to the session bus. */
	391	sr_dbg("Sending SR_DF_HEADER.");
	392	packet.type = SR_DF_HEADER;
	393	packet.payload = (uint8_t *)&header;
	394	header.feed_version = 1;
	395	gettimeofday(&header.starttime, NULL);
	396	sr_session_send(devc->cb_data, &packet);
	397
	398	/* Send metadata about the SR_DF_ANALOG packets to come. */
	399	sr_dbg("Sending SR_DF_META_ANALOG.");
	400	packet.type = SR_DF_META_ANALOG;
	401	packet.payload = &meta;
	402	meta.num_probes = 1;
	403	sr_session_send(devc->cb_data, &packet);
	404
bbabddbd	405	/* Poll every 50ms, or whenever some data comes in. */
7dc55d93	406	sr_source_add(devc->serial->fd, G_IO_IN, 50,
bbabddbd	407	tekpower_dmm_receive_data, (void *)sdi);
7dc55d93 AG	408
	409	return SR_OK;
	410	}
	411
	412	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
bbabddbd	413	void *cb_data)
7dc55d93 AG	414	{
	415	struct sr_datafeed_packet packet;
	416	struct dev_context *devc;
	417
	418	if (sdi->status != SR_ST_ACTIVE)
	419	return SR_ERR;
	420
	421	if (!(devc = sdi->priv)) {
	422	sr_err("sdi->priv was NULL.");
	423	return SR_ERR_BUG;
	424	}
	425
	426	sr_dbg("Stopping acquisition.");
	427
	428	sr_source_remove(devc->serial->fd);
	429	hw_dev_close((struct sr_dev_inst *)sdi);
	430
	431	/* Send end packet to the session bus. */
	432	sr_dbg("Sending SR_DF_END.");
	433	packet.type = SR_DF_END;
	434	sr_session_send(cb_data, &packet);
	435
	436	return SR_OK;
	437	}
	438
bbabddbd	439	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info = {
7dc55d93	440	.name = "tekpower-dmm",
bbabddbd	441	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
7dc55d93 AG	442	.api_version = 1,
	443	.init = hw_init,
	444	.cleanup = hw_cleanup,
	445	.scan = hw_scan,
	446	.dev_list = hw_dev_list,
	447	.dev_clear = clear_instances,
	448	.dev_open = hw_dev_open,
	449	.dev_close = hw_dev_close,
	450	.info_get = hw_info_get,
	451	.dev_config_set = hw_dev_config_set,
	452	.dev_acquisition_start = hw_dev_acquisition_start,
	453	.dev_acquisition_stop = hw_dev_acquisition_stop,
	454	.priv = NULL,
	455	};