[libsigrok.git] / hardware / serial-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>
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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_tp4000zc_driver_info;
static struct sr_dev_driver *di_tekpower_tp4000zc = &tekpower_tp4000zc_driver_info;

/* After hw_init() this will point to a device-specific entry (see above). */
static struct sr_dev_driver *di = NULL;

SR_PRIV struct dmm_info dmms[] = {
	{
		"TekPower", "TP4000ZC",
		"2400/8n1", 2400,
		FS9721_PACKET_SIZE,
		sr_fs9721_packet_valid,
		sr_fs9721_parse,
		dmm_details_tp4000zc,
	},
};

/* 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(int dmm)
{
	struct drv_context *drvc;

	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
		sr_err("Driver context malloc failed.");
		return SR_ERR_MALLOC;
	}

	if (dmm == TEKPOWER_TP4000ZC)
		di = di_tekpower_tp4000zc;
	sr_dbg("Selected '%s' subdriver.", di->name);

	di->priv = drvc;

	return SR_OK;
}

static int hw_init_tekpower_tp4000zc(void)
{
	return hw_init(TEKPOWER_TP4000ZC);
}

static GSList *scan(const char *conn, const char *serialcomm, int dmm)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_probe *probe;
	struct sr_serial_dev_inst *serial;
	GSList *devices;
	int dropped, ret;
	size_t len;
	uint8_t buf[128];

	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
		return NULL;

	if (serial_open(serial, SERIAL_RDONLY | SERIAL_NONBLOCK) != SR_OK)
		return NULL;

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

	drvc = di->priv;
	devices = NULL;
	serial_flush(serial);

	/*
	 * 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.
	 */

	/* Let's get a bit of data and see if we can find a packet. */
	len = sizeof(buf);

	ret = serial_stream_detect(serial, buf, &len, dmms[dmm].packet_size,
				   dmms[dmm].packet_valid, 1000,
				   dmms[dmm].baudrate);
	if (ret != SR_OK)
		goto scan_cleanup;

	/*
	 * If we dropped more than two packets worth of data, something is
	 * wrong. We shouldn't quit however, since the dropped bytes might be
	 * just zeroes at the beginning of the stream. Those can occur as a
	 * combination of the nonstandard cable that ships with this device and
	 * the serial port or USB to serial adapter.
	 */
	dropped = len - dmms[dmm].packet_size;
	if (dropped > 2 * dmms[dmm].packet_size)
		sr_warn("Had to drop too much data.");

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

	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, dmms[dmm].vendor,
				    dmms[dmm].device, "")))
		goto scan_cleanup;

	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
		sr_err("Device context malloc failed.");
		goto scan_cleanup;
	}

	devc->serial = serial;

	sdi->priv = devc;
	sdi->driver = di;
	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
		goto scan_cleanup;
	sdi->probes = g_slist_append(sdi->probes, probe);
	drvc->instances = g_slist_append(drvc->instances, sdi);
	devices = g_slist_append(devices, sdi);

scan_cleanup:
	serial_close(serial);

	return devices;
}

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

	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 (!strcmp(di->name, "tekpower-tp4000zc"))
		dmm = 0;

	if (serialcomm) {
		/* Use the provided comm specs. */
		devices = scan(conn, serialcomm, dmm);
	} else {
		/* Try the default. */
		devices = scan(conn, dmms[dmm].conn, dmm);
	}

	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_RDONLY) != 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;
	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;
	int (*receive_data)(int, int, void *) = NULL;

	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);

	if (!strcmp(di->name, "tekpower-tp4000zc"))
		receive_data = tekpower_tp4000zc_receive_data;

	/* Poll every 50ms, or whenever some data comes in. */
	sr_source_add(devc->serial->fd, G_IO_IN, 50,
		      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 tekpower_tp4000zc_driver_info = {
	.name = "tekpower-tp4000zc",
	.longname = "TekPower TP4000ZC",
	.api_version = 1,
	.init = hw_init_tekpower_tp4000zc,
	.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>
729b01f9	6	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
7dc55d93 AG	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation, either version 3 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#include <glib.h>
7dc55d93 AG	23	#include <sys/types.h>
	24	#include <sys/stat.h>
	25	#include <fcntl.h>
	26	#include <string.h>
	27	#include <errno.h>
bbabddbd UH	28	#include "libsigrok.h"
	29	#include "libsigrok-internal.h"
	30	#include "protocol.h"
7dc55d93 AG	31
	32	static const int hwopts[] = {
	33	SR_HWOPT_CONN,
	34	SR_HWOPT_SERIALCOMM,
	35	0,
	36	};
	37
	38	static const int hwcaps[] = {
	39	SR_HWCAP_MULTIMETER,
	40	SR_HWCAP_LIMIT_SAMPLES,
	41	SR_HWCAP_CONTINUOUS,
	42	0,
	43	};
	44
	45	static const char *probe_names[] = {
	46	"Probe",
	47	NULL,
	48	};
	49
729b01f9 UH	50	SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info;
	51	static struct sr_dev_driver *di_tekpower_tp4000zc = &tekpower_tp4000zc_driver_info;
	52
	53	/* After hw_init() this will point to a device-specific entry (see above). */
	54	static struct sr_dev_driver *di = NULL;
	55
	56	SR_PRIV struct dmm_info dmms[] = {
	57	{
	58	"TekPower", "TP4000ZC",
	59	"2400/8n1", 2400,
	60	FS9721_PACKET_SIZE,
	61	sr_fs9721_packet_valid,
	62	sr_fs9721_parse,
	63	dmm_details_tp4000zc,
	64	},
	65	};
7dc55d93 AG	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
729b01f9	93	static int hw_init(int dmm)
7dc55d93 AG	94	{
	95	struct drv_context *drvc;
	96
	97	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
bbabddbd UH	98	sr_err("Driver context malloc failed.");
bbabddbd UH	99	return SR_ERR_MALLOC;
7dc55d93 AG	100	}
7dc55d93 AG	101
729b01f9 UH	102	if (dmm == TEKPOWER_TP4000ZC)
	103	di = di_tekpower_tp4000zc;
	104	sr_dbg("Selected '%s' subdriver.", di->name);
	105
7dc55d93 AG	106	di->priv = drvc;
	107
	108	return SR_OK;
	109	}
	110
729b01f9 UH	111	static int hw_init_tekpower_tp4000zc(void)
	112	{
	113	return hw_init(TEKPOWER_TP4000ZC);
	114	}
	115
	116	static GSList scan(const char conn, const char *serialcomm, int dmm)
7dc55d93 AG	117	{
	118	struct sr_dev_inst *sdi;
	119	struct drv_context *drvc;
	120	struct dev_context *devc;
	121	struct sr_probe *probe;
d35afa87	122	struct sr_serial_dev_inst *serial;
7dc55d93	123	GSList *devices;
2546b05c AG	124	int dropped, ret;
	125	size_t len;
	126	uint8_t buf[128];
7dc55d93	127
d35afa87	128	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
7dc55d93	129	return NULL;
d35afa87	130
a54dd31e	131	if (serial_open(serial, SERIAL_RDONLY \| SERIAL_NONBLOCK) != SR_OK)
7dc55d93	132	return NULL;
7dc55d93	133
bbabddbd	134	sr_info("Probing port %s readonly.", conn);
7dc55d93 AG	135
7dc55d93 AG	136	drvc = di->priv;
7dc55d93	137	devices = NULL;
d35afa87	138	serial_flush(serial);
bbabddbd UH	139
	140	/*
	141	* There's no way to get an ID from the multimeter. It just sends data
	142	* periodically, so the best we can do is check if the packets match
	143	* the expected format.
	144	*/
7dc55d93	145
2546b05c AG	146	/* Let's get a bit of data and see if we can find a packet. */
2546b05c AG	147	len = sizeof(buf);
7dc55d93	148
729b01f9 UH	149	ret = serial_stream_detect(serial, buf, &len, dmms[dmm].packet_size,
	150	dmms[dmm].packet_valid, 1000,
	151	dmms[dmm].baudrate);
2546b05c AG	152	if (ret != SR_OK)
2546b05c AG	153	goto scan_cleanup;
7dc55d93	154
2546b05c AG	155	/*
	156	* If we dropped more than two packets worth of data, something is
	157	* wrong. We shouldn't quit however, since the dropped bytes might be
	158	* just zeroes at the beginning of the stream. Those can occur as a
	159	* combination of the nonstandard cable that ships with this device and
	160	* the serial port or USB to serial adapter.
	161	*/
729b01f9 UH	162	dropped = len - dmms[dmm].packet_size;
729b01f9 UH	163	if (dropped > 2 * dmms[dmm].packet_size)
6bef68a7	164	sr_warn("Had to drop too much data.");
7dc55d93	165
2546b05c	166	sr_info("Found device on port %s.", conn);
7dc55d93	167
729b01f9 UH	168	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, dmms[dmm].vendor,
729b01f9 UH	169	dmms[dmm].device, "")))
2546b05c	170	goto scan_cleanup;
6bef68a7	171
2546b05c AG	172	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	173	sr_err("Device context malloc failed.");
	174	goto scan_cleanup;
7dc55d93 AG	175	}
7dc55d93 AG	176
2546b05c AG	177	devc->serial = serial;
	178
	179	sdi->priv = devc;
	180	sdi->driver = di;
	181	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	182	goto scan_cleanup;
	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
	187	scan_cleanup:
d35afa87	188	serial_close(serial);
2546b05c	189
7dc55d93 AG	190	return devices;
	191	}
	192
	193	static GSList hw_scan(GSList options)
	194	{
	195	struct sr_hwopt *opt;
	196	GSList l, devices;
	197	const char conn, serialcomm;
729b01f9	198	int dmm;
7dc55d93 AG	199
	200	conn = serialcomm = NULL;
	201	for (l = options; l; l = l->next) {
	202	opt = l->data;
	203	switch (opt->hwopt) {
	204	case SR_HWOPT_CONN:
	205	conn = opt->value;
	206	break;
	207	case SR_HWOPT_SERIALCOMM:
	208	serialcomm = opt->value;
	209	break;
	210	}
	211	}
	212	if (!conn)
	213	return NULL;
	214
729b01f9 UH	215	if (!strcmp(di->name, "tekpower-tp4000zc"))
	216	dmm = 0;
	217
7dc55d93 AG	218	if (serialcomm) {
7dc55d93 AG	219	/* Use the provided comm specs. */
729b01f9	220	devices = scan(conn, serialcomm, dmm);
7dc55d93	221	} else {
d35afa87	222	/* Try the default. */
729b01f9	223	devices = scan(conn, dmms[dmm].conn, dmm);
7dc55d93 AG	224	}
	225
	226	return devices;
	227	}
	228
	229	static GSList *hw_dev_list(void)
	230	{
	231	struct drv_context *drvc;
	232
	233	drvc = di->priv;
	234
	235	return drvc->instances;
	236	}
	237
	238	static int hw_dev_open(struct sr_dev_inst *sdi)
	239	{
	240	struct dev_context *devc;
	241
	242	if (!(devc = sdi->priv)) {
	243	sr_err("sdi->priv was NULL.");
	244	return SR_ERR_BUG;
	245	}
	246
a54dd31e	247	if (serial_open(devc->serial, SERIAL_RDONLY) != SR_OK)
7dc55d93	248	return SR_ERR;
bbabddbd	249
7dc55d93 AG	250	sdi->status = SR_ST_ACTIVE;
	251
	252	return SR_OK;
	253	}
	254
	255	static int hw_dev_close(struct sr_dev_inst *sdi)
	256	{
	257	struct dev_context *devc;
	258
	259	if (!(devc = sdi->priv)) {
	260	sr_err("sdi->priv was NULL.");
	261	return SR_ERR_BUG;
	262	}
	263
	264	if (devc->serial && devc->serial->fd != -1) {
d35afa87	265	serial_close(devc->serial);
7dc55d93 AG	266	sdi->status = SR_ST_INACTIVE;
	267	}
	268
	269	return SR_OK;
	270	}
	271
	272	static int hw_cleanup(void)
	273	{
	274	clear_instances();
	275
	276	return SR_OK;
	277	}
	278
	279	static int hw_info_get(int info_id, const void **data,
bbabddbd	280	const struct sr_dev_inst *sdi)
7dc55d93	281	{
bbabddbd	282	(void)sdi;
7dc55d93 AG	283
	284	switch (info_id) {
	285	case SR_DI_HWOPTS:
	286	*data = hwopts;
	287	break;
	288	case SR_DI_HWCAPS:
	289	*data = hwcaps;
	290	break;
	291	case SR_DI_NUM_PROBES:
	292	*data = GINT_TO_POINTER(1);
	293	break;
	294	case SR_DI_PROBE_NAMES:
	295	*data = probe_names;
	296	break;
	297	default:
	298	return SR_ERR_ARG;
	299	}
	300
	301	return SR_OK;
	302	}
	303
	304	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
bbabddbd	305	const void *value)
7dc55d93 AG	306	{
	307	struct dev_context *devc;
	308
	309	if (sdi->status != SR_ST_ACTIVE)
	310	return SR_ERR;
	311
	312	if (!(devc = sdi->priv)) {
	313	sr_err("sdi->priv was NULL.");
	314	return SR_ERR_BUG;
	315	}
	316
	317	switch (hwcap) {
	318	case SR_HWCAP_LIMIT_SAMPLES:
	319	devc->limit_samples = (const uint64_t )value;
	320	sr_dbg("Setting sample limit to %" PRIu64 ".",
	321	devc->limit_samples);
	322	break;
	323	default:
	324	sr_err("Unknown capability: %d.", hwcap);
	325	return SR_ERR;
	326	break;
	327	}
	328
	329	return SR_OK;
	330	}
	331
	332	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
bbabddbd	333	void *cb_data)
7dc55d93 AG	334	{
	335	struct sr_datafeed_packet packet;
	336	struct sr_datafeed_header header;
	337	struct sr_datafeed_meta_analog meta;
	338	struct dev_context *devc;
729b01f9	339	int (receive_data)(int, int, void ) = NULL;
7dc55d93 AG	340
	341	if (!(devc = sdi->priv)) {
	342	sr_err("sdi->priv was NULL.");
	343	return SR_ERR_BUG;
	344	}
	345
	346	sr_dbg("Starting acquisition.");
	347
	348	devc->cb_data = cb_data;
	349
bbabddbd UH	350	/*
bbabddbd UH	351	* Reset the number of samples to take. If we've already collected our
7dc55d93	352	* quota, but we start a new session, and don't reset this, we'll just
bbabddbd UH	353	* quit without acquiring any new samples.
bbabddbd UH	354	*/
7dc55d93 AG	355	devc->num_samples = 0;
	356
	357	/* Send header packet to the session bus. */
	358	sr_dbg("Sending SR_DF_HEADER.");
	359	packet.type = SR_DF_HEADER;
	360	packet.payload = (uint8_t *)&header;
	361	header.feed_version = 1;
	362	gettimeofday(&header.starttime, NULL);
	363	sr_session_send(devc->cb_data, &packet);
	364
	365	/* Send metadata about the SR_DF_ANALOG packets to come. */
	366	sr_dbg("Sending SR_DF_META_ANALOG.");
	367	packet.type = SR_DF_META_ANALOG;
	368	packet.payload = &meta;
	369	meta.num_probes = 1;
	370	sr_session_send(devc->cb_data, &packet);
	371
729b01f9 UH	372	if (!strcmp(di->name, "tekpower-tp4000zc"))
	373	receive_data = tekpower_tp4000zc_receive_data;
	374
bbabddbd	375	/* Poll every 50ms, or whenever some data comes in. */
7dc55d93	376	sr_source_add(devc->serial->fd, G_IO_IN, 50,
729b01f9	377	receive_data, (void *)sdi);
7dc55d93 AG	378
	379	return SR_OK;
	380	}
	381
69b07d14	382	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
7dc55d93 AG	383	{
	384	struct sr_datafeed_packet packet;
	385	struct dev_context *devc;
	386
	387	if (sdi->status != SR_ST_ACTIVE)
	388	return SR_ERR;
	389
	390	if (!(devc = sdi->priv)) {
	391	sr_err("sdi->priv was NULL.");
	392	return SR_ERR_BUG;
	393	}
	394
	395	sr_dbg("Stopping acquisition.");
	396
	397	sr_source_remove(devc->serial->fd);
	398	hw_dev_close((struct sr_dev_inst *)sdi);
	399
	400	/* Send end packet to the session bus. */
	401	sr_dbg("Sending SR_DF_END.");
	402	packet.type = SR_DF_END;
	403	sr_session_send(cb_data, &packet);
	404
	405	return SR_OK;
	406	}
	407
729b01f9 UH	408	SR_PRIV struct sr_dev_driver tekpower_tp4000zc_driver_info = {
	409	.name = "tekpower-tp4000zc",
	410	.longname = "TekPower TP4000ZC",
7dc55d93	411	.api_version = 1,
729b01f9	412	.init = hw_init_tekpower_tp4000zc,
7dc55d93 AG	413	.cleanup = hw_cleanup,
	414	.scan = hw_scan,
	415	.dev_list = hw_dev_list,
	416	.dev_clear = clear_instances,
	417	.dev_open = hw_dev_open,
	418	.dev_close = hw_dev_close,
	419	.info_get = hw_info_get,
	420	.dev_config_set = hw_dev_config_set,
	421	.dev_acquisition_start = hw_dev_acquisition_start,
	422	.dev_acquisition_stop = hw_dev_acquisition_stop,
	423	.priv = NULL,
	424	};