[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"

#define SERIALCOMM "2400/8n1"

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;
}

typedef gboolean (*packet_valid_t)(const uint8_t *buf);

/**
 * Try to find a valid packet in a serial data stream.
 *
 * @param serial Previously initialized serial port structure.
 * @param buf Buffer containing the bytes to write.
 * @param count Size of the buffer.
 * @param packet_size Size, in bytes, of a valid packet.
 * @param is_valid Callback that assesses whether the packet is valid or not.
 * @param timeout_ms The timeout after which, if no packet is detected, to
 *                   abort scanning.
 * @param baudrate The baudrate of the serial port. This parameter is not
 *                 critical, but it helps fine tune the serial port polling
 *                 delay.
 *
 * @return SR_OK if a valid packet is found within the given timeout,
 *         SR_ERR upon failure.
 */
static int serial_stream_detect(struct sr_serial_dev_inst *serial,
				uint8_t *buf, size_t *buflen,
				size_t packet_size, packet_valid_t is_valid,
				uint64_t timeout_ms, int baudrate)
{
	uint64_t start, time, byte_delay_us;
	size_t ibuf, i, maxlen;
	int len;

	maxlen = *buflen;

	sr_dbg("Detecting packets on FD %d (timeout = %" PRIu64
	       "ms, baudrate = %d).", serial->fd, timeout_ms, baudrate);

	if (maxlen < (packet_size / 2) ) {
		sr_err("Buffer size must be at least twice the packet size.");
		return SR_ERR;
	}

	timeout_ms *= 1000;

	/* Assume 8n1 transmission. That is 10 bits for every byte. */
	byte_delay_us = 10 * (1000000 / baudrate);
	start = g_get_monotonic_time();

	i = ibuf = len = 0;
	while (ibuf < maxlen) {
		len = serial_read(serial, &buf[ibuf], 1);
		if (len > 0) {
			ibuf += len;
		} else if (len == 0) {
			sr_spew("Error: Only read 0 bytes.");
		} else {
			/* Error reading byte, but continuing anyway. */
		}
		if ((ibuf - i) >= packet_size) {
			/* We have at least a packet's worth of data. */
			if (is_valid(&buf[i])) {
				time = g_get_monotonic_time() - start;
				time /= 1000;
				sr_spew("Found valid %d-byte packet after "
					"%" PRIu64 "ms.", (ibuf - i), time);
				*buflen = ibuf;
				return SR_OK;
			} else {
				sr_spew("Got %d bytes, but not a valid "
					"packet.", (ibuf - i));
			}
			/* Not a valid packet. Continue searching. */
			i++;
		}
		if (g_get_monotonic_time() - start > timeout_ms) {
			/* Timeout */
			sr_dbg("Detection timed out after %dms.", timeout_ms);
			break;
		}
		g_usleep(byte_delay_us);
	}

	*buflen = ibuf;

	sr_err("Didn't find a valid packet (read %d bytes).", *buflen);

	return SR_ERR;
}

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 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, O_RDONLY | O_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, FS9721_PACKET_SIZE,
				   sr_fs9721_packet_valid, 1000, 2400);
	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 - FS9721_PACKET_SIZE;
	if (dropped > 2 * FS9721_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, "TekPower",
				    "TP4000ZC", "")))
		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;

	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. */
		devices = lcd14_scan(conn, SERIALCOMM);
	}

	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, O_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;

	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(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	30
d35afa87 BV	31	#define SERIALCOMM "2400/8n1"
d35afa87 BV	32
7dc55d93 AG	33	static const int hwopts[] = {
	34	SR_HWOPT_CONN,
	35	SR_HWOPT_SERIALCOMM,
	36	0,
	37	};
	38
	39	static const int hwcaps[] = {
	40	SR_HWCAP_MULTIMETER,
	41	SR_HWCAP_LIMIT_SAMPLES,
	42	SR_HWCAP_CONTINUOUS,
	43	0,
	44	};
	45
	46	static const char *probe_names[] = {
	47	"Probe",
	48	NULL,
	49	};
	50
bbabddbd UH	51	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info;
bbabddbd UH	52	static struct sr_dev_driver *di = &tekpower_dmm_driver_info;
7dc55d93 AG	53
	54	/* Properly close and free all devices. */
	55	static int clear_instances(void)
	56	{
	57	struct sr_dev_inst *sdi;
	58	struct drv_context *drvc;
	59	struct dev_context *devc;
	60	GSList *l;
	61
	62	if (!(drvc = di->priv))
	63	return SR_OK;
	64
	65	drvc = di->priv;
	66	for (l = drvc->instances; l; l = l->next) {
	67	if (!(sdi = l->data))
	68	continue;
	69	if (!(devc = sdi->priv))
	70	continue;
	71	sr_serial_dev_inst_free(devc->serial);
	72	sr_dev_inst_free(sdi);
	73	}
	74	g_slist_free(drvc->instances);
	75	drvc->instances = NULL;
	76
	77	return SR_OK;
	78	}
	79
	80	static int hw_init(void)
	81	{
	82	struct drv_context *drvc;
	83
	84	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
bbabddbd UH	85	sr_err("Driver context malloc failed.");
bbabddbd UH	86	return SR_ERR_MALLOC;
7dc55d93 AG	87	}
	88
	89	di->priv = drvc;
	90
	91	return SR_OK;
	92	}
	93
2546b05c AG	94	typedef gboolean (packet_valid_t)(const uint8_t buf);
	95
	96	/**
6bef68a7	97	* Try to find a valid packet in a serial data stream.
2546b05c	98	*
6bef68a7	99	* @param serial Previously initialized serial port structure.
2546b05c AG	100	* @param buf Buffer containing the bytes to write.
2546b05c AG	101	* @param count Size of the buffer.
6bef68a7 UH	102	* @param packet_size Size, in bytes, of a valid packet.
	103	* @param is_valid Callback that assesses whether the packet is valid or not.
	104	* @param timeout_ms The timeout after which, if no packet is detected, to
	105	* abort scanning.
	106	* @param baudrate The baudrate of the serial port. This parameter is not
2546b05c	107	* critical, but it helps fine tune the serial port polling
6bef68a7	108	* delay.
2546b05c	109	*
6bef68a7	110	* @return SR_OK if a valid packet is found within the given timeout,
2546b05c AG	111	* SR_ERR upon failure.
	112	*/
	113	static int serial_stream_detect(struct sr_serial_dev_inst *serial,
	114	uint8_t buf, size_t buflen,
6bef68a7	115	size_t packet_size, packet_valid_t is_valid,
2546b05c AG	116	uint64_t timeout_ms, int baudrate)
2546b05c AG	117	{
6bef68a7 UH	118	uint64_t start, time, byte_delay_us;
6bef68a7 UH	119	size_t ibuf, i, maxlen;
2546b05c	120	int len;
2546b05c	121
6bef68a7 UH	122	maxlen = *buflen;
	123
	124	sr_dbg("Detecting packets on FD %d (timeout = %" PRIu64
	125	"ms, baudrate = %d).", serial->fd, timeout_ms, baudrate);
	126
	127	if (maxlen < (packet_size / 2) ) {
	128	sr_err("Buffer size must be at least twice the packet size.");
2546b05c AG	129	return SR_ERR;
	130	}
	131
	132	timeout_ms *= 1000;
6bef68a7 UH	133
	134	/* Assume 8n1 transmission. That is 10 bits for every byte. */
	135	byte_delay_us = 10 * (1000000 / baudrate);
2546b05c AG	136	start = g_get_monotonic_time();
	137
	138	i = ibuf = len = 0;
	139	while (ibuf < maxlen) {
	140	len = serial_read(serial, &buf[ibuf], 1);
6bef68a7 UH	141	if (len > 0) {
	142	ibuf += len;
	143	} else if (len == 0) {
	144	sr_spew("Error: Only read 0 bytes.");
	145	} else {
	146	/* Error reading byte, but continuing anyway. */
	147	}
2546b05c	148	if ((ibuf - i) >= packet_size) {
6bef68a7	149	/* We have at least a packet's worth of data. */
2546b05c	150	if (is_valid(&buf[i])) {
6bef68a7	151	time = g_get_monotonic_time() - start;
2546b05c	152	time /= 1000;
6bef68a7 UH	153	sr_spew("Found valid %d-byte packet after "
6bef68a7 UH	154	"%" PRIu64 "ms.", (ibuf - i), time);
2546b05c AG	155	*buflen = ibuf;
2546b05c AG	156	return SR_OK;
6bef68a7 UH	157	} else {
	158	sr_spew("Got %d bytes, but not a valid "
	159	"packet.", (ibuf - i));
2546b05c	160	}
6bef68a7	161	/* Not a valid packet. Continue searching. */
2546b05c AG	162	i++;
	163	}
	164	if (g_get_monotonic_time() - start > timeout_ms) {
	165	/* Timeout */
6bef68a7	166	sr_dbg("Detection timed out after %dms.", timeout_ms);
2546b05c AG	167	break;
	168	}
	169	g_usleep(byte_delay_us);
	170	}
	171
	172	*buflen = ibuf;
2546b05c	173
6bef68a7 UH	174	sr_err("Didn't find a valid packet (read %d bytes).", *buflen);
	175
	176	return SR_ERR;
2546b05c AG	177	}
2546b05c AG	178
7dc55d93 AG	179	static GSList lcd14_scan(const char conn, const char *serialcomm)
	180	{
	181	struct sr_dev_inst *sdi;
	182	struct drv_context *drvc;
	183	struct dev_context *devc;
	184	struct sr_probe *probe;
d35afa87	185	struct sr_serial_dev_inst *serial;
7dc55d93	186	GSList *devices;
2546b05c AG	187	int dropped, ret;
	188	size_t len;
	189	uint8_t buf[128];
7dc55d93	190
d35afa87	191	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
7dc55d93	192	return NULL;
d35afa87	193
6bef68a7	194	if (serial_open(serial, O_RDONLY \| O_NONBLOCK) != SR_OK)
7dc55d93	195	return NULL;
7dc55d93	196
bbabddbd	197	sr_info("Probing port %s readonly.", conn);
7dc55d93 AG	198
7dc55d93 AG	199	drvc = di->priv;
7dc55d93	200	devices = NULL;
d35afa87	201	serial_flush(serial);
bbabddbd UH	202
	203	/*
	204	* There's no way to get an ID from the multimeter. It just sends data
	205	* periodically, so the best we can do is check if the packets match
	206	* the expected format.
	207	*/
7dc55d93	208
2546b05c AG	209	/* Let's get a bit of data and see if we can find a packet. */
2546b05c AG	210	len = sizeof(buf);
7dc55d93	211
2546b05c AG	212	ret = serial_stream_detect(serial, buf, &len, FS9721_PACKET_SIZE,
	213	sr_fs9721_packet_valid, 1000, 2400);
	214	if (ret != SR_OK)
	215	goto scan_cleanup;
7dc55d93	216
2546b05c AG	217	/*
	218	* If we dropped more than two packets worth of data, something is
	219	* wrong. We shouldn't quit however, since the dropped bytes might be
	220	* just zeroes at the beginning of the stream. Those can occur as a
	221	* combination of the nonstandard cable that ships with this device and
	222	* the serial port or USB to serial adapter.
	223	*/
	224	dropped = len - FS9721_PACKET_SIZE;
6bef68a7 UH	225	if (dropped > 2 * FS9721_PACKET_SIZE)
6bef68a7 UH	226	sr_warn("Had to drop too much data.");
7dc55d93	227
2546b05c	228	sr_info("Found device on port %s.", conn);
7dc55d93	229
2546b05c AG	230	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
	231	"TP4000ZC", "")))
	232	goto scan_cleanup;
6bef68a7	233
2546b05c AG	234	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	235	sr_err("Device context malloc failed.");
	236	goto scan_cleanup;
7dc55d93 AG	237	}
7dc55d93 AG	238
2546b05c AG	239	devc->serial = serial;
	240
	241	sdi->priv = devc;
	242	sdi->driver = di;
	243	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	244	goto scan_cleanup;
	245	sdi->probes = g_slist_append(sdi->probes, probe);
	246	drvc->instances = g_slist_append(drvc->instances, sdi);
	247	devices = g_slist_append(devices, sdi);
	248
	249	scan_cleanup:
d35afa87	250	serial_close(serial);
2546b05c	251
7dc55d93 AG	252	return devices;
	253	}
	254
	255	static GSList hw_scan(GSList options)
	256	{
	257	struct sr_hwopt *opt;
	258	GSList l, devices;
	259	const char conn, serialcomm;
	260
	261	conn = serialcomm = NULL;
	262	for (l = options; l; l = l->next) {
	263	opt = l->data;
	264	switch (opt->hwopt) {
	265	case SR_HWOPT_CONN:
	266	conn = opt->value;
	267	break;
	268	case SR_HWOPT_SERIALCOMM:
	269	serialcomm = opt->value;
	270	break;
	271	}
	272	}
	273	if (!conn)
	274	return NULL;
	275
	276	if (serialcomm) {
	277	/* Use the provided comm specs. */
	278	devices = lcd14_scan(conn, serialcomm);
	279	} else {
d35afa87 BV	280	/* Try the default. */
d35afa87 BV	281	devices = lcd14_scan(conn, SERIALCOMM);
7dc55d93 AG	282	}
	283
	284	return devices;
	285	}
	286
	287	static GSList *hw_dev_list(void)
	288	{
	289	struct drv_context *drvc;
	290
	291	drvc = di->priv;
	292
	293	return drvc->instances;
	294	}
	295
	296	static int hw_dev_open(struct sr_dev_inst *sdi)
	297	{
	298	struct dev_context *devc;
	299
	300	if (!(devc = sdi->priv)) {
	301	sr_err("sdi->priv was NULL.");
	302	return SR_ERR_BUG;
	303	}
	304
d35afa87	305	if (serial_open(devc->serial, O_RDONLY) != SR_OK)
7dc55d93	306	return SR_ERR;
bbabddbd	307
7dc55d93 AG	308	sdi->status = SR_ST_ACTIVE;
	309
	310	return SR_OK;
	311	}
	312
	313	static int hw_dev_close(struct sr_dev_inst *sdi)
	314	{
	315	struct dev_context *devc;
	316
	317	if (!(devc = sdi->priv)) {
	318	sr_err("sdi->priv was NULL.");
	319	return SR_ERR_BUG;
	320	}
	321
	322	if (devc->serial && devc->serial->fd != -1) {
d35afa87	323	serial_close(devc->serial);
7dc55d93 AG	324	sdi->status = SR_ST_INACTIVE;
	325	}
	326
	327	return SR_OK;
	328	}
	329
	330	static int hw_cleanup(void)
	331	{
	332	clear_instances();
	333
	334	return SR_OK;
	335	}
	336
	337	static int hw_info_get(int info_id, const void **data,
bbabddbd	338	const struct sr_dev_inst *sdi)
7dc55d93	339	{
bbabddbd	340	(void)sdi;
7dc55d93 AG	341
	342	switch (info_id) {
	343	case SR_DI_HWOPTS:
	344	*data = hwopts;
	345	break;
	346	case SR_DI_HWCAPS:
	347	*data = hwcaps;
	348	break;
	349	case SR_DI_NUM_PROBES:
	350	*data = GINT_TO_POINTER(1);
	351	break;
	352	case SR_DI_PROBE_NAMES:
	353	*data = probe_names;
	354	break;
	355	default:
	356	return SR_ERR_ARG;
	357	}
	358
	359	return SR_OK;
	360	}
	361
	362	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
bbabddbd	363	const void *value)
7dc55d93 AG	364	{
	365	struct dev_context *devc;
	366
	367	if (sdi->status != SR_ST_ACTIVE)
	368	return SR_ERR;
	369
	370	if (!(devc = sdi->priv)) {
	371	sr_err("sdi->priv was NULL.");
	372	return SR_ERR_BUG;
	373	}
	374
	375	switch (hwcap) {
	376	case SR_HWCAP_LIMIT_SAMPLES:
	377	devc->limit_samples = (const uint64_t )value;
	378	sr_dbg("Setting sample limit to %" PRIu64 ".",
	379	devc->limit_samples);
	380	break;
	381	default:
	382	sr_err("Unknown capability: %d.", hwcap);
	383	return SR_ERR;
	384	break;
	385	}
	386
	387	return SR_OK;
	388	}
	389
	390	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
bbabddbd	391	void *cb_data)
7dc55d93 AG	392	{
	393	struct sr_datafeed_packet packet;
	394	struct sr_datafeed_header header;
	395	struct sr_datafeed_meta_analog meta;
	396	struct dev_context *devc;
	397
	398	if (!(devc = sdi->priv)) {
	399	sr_err("sdi->priv was NULL.");
	400	return SR_ERR_BUG;
	401	}
	402
	403	sr_dbg("Starting acquisition.");
	404
	405	devc->cb_data = cb_data;
	406
bbabddbd UH	407	/*
bbabddbd UH	408	* Reset the number of samples to take. If we've already collected our
7dc55d93	409	* quota, but we start a new session, and don't reset this, we'll just
bbabddbd UH	410	* quit without acquiring any new samples.
bbabddbd UH	411	*/
7dc55d93 AG	412	devc->num_samples = 0;
	413
	414	/* Send header packet to the session bus. */
	415	sr_dbg("Sending SR_DF_HEADER.");
	416	packet.type = SR_DF_HEADER;
	417	packet.payload = (uint8_t *)&header;
	418	header.feed_version = 1;
	419	gettimeofday(&header.starttime, NULL);
	420	sr_session_send(devc->cb_data, &packet);
	421
	422	/* Send metadata about the SR_DF_ANALOG packets to come. */
	423	sr_dbg("Sending SR_DF_META_ANALOG.");
	424	packet.type = SR_DF_META_ANALOG;
	425	packet.payload = &meta;
	426	meta.num_probes = 1;
	427	sr_session_send(devc->cb_data, &packet);
	428
bbabddbd	429	/* Poll every 50ms, or whenever some data comes in. */
7dc55d93	430	sr_source_add(devc->serial->fd, G_IO_IN, 50,
bbabddbd	431	tekpower_dmm_receive_data, (void *)sdi);
7dc55d93 AG	432
	433	return SR_OK;
	434	}
	435
69b07d14	436	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
7dc55d93 AG	437	{
	438	struct sr_datafeed_packet packet;
	439	struct dev_context *devc;
	440
	441	if (sdi->status != SR_ST_ACTIVE)
	442	return SR_ERR;
	443
	444	if (!(devc = sdi->priv)) {
	445	sr_err("sdi->priv was NULL.");
	446	return SR_ERR_BUG;
	447	}
	448
	449	sr_dbg("Stopping acquisition.");
	450
	451	sr_source_remove(devc->serial->fd);
	452	hw_dev_close((struct sr_dev_inst *)sdi);
	453
	454	/* Send end packet to the session bus. */
	455	sr_dbg("Sending SR_DF_END.");
	456	packet.type = SR_DF_END;
	457	sr_session_send(cb_data, &packet);
	458
	459	return SR_OK;
	460	}
	461
bbabddbd	462	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info = {
7dc55d93	463	.name = "tekpower-dmm",
bbabddbd	464	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
7dc55d93 AG	465	.api_version = 1,
	466	.init = hw_init,
	467	.cleanup = hw_cleanup,
	468	.scan = hw_scan,
	469	.dev_list = hw_dev_list,
	470	.dev_clear = clear_instances,
	471	.dev_open = hw_dev_open,
	472	.dev_close = hw_dev_close,
	473	.info_get = hw_info_get,
	474	.dev_config_set = hw_dev_config_set,
	475	.dev_acquisition_start = hw_dev_acquisition_start,
	476	.dev_acquisition_stop = hw_dev_acquisition_stop,
	477	.priv = NULL,
	478	};