[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 fd File descriptor of the serial port.
 * @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 he given timeout,
 *         SR_ERR upon failure.
 */
static int serial_stream_detect(struct sr_serial_dev_inst *serial,
				uint8_t *buf, size_t *buflen,
				const size_t packet_size,
				packet_valid_t is_valid,
				uint64_t timeout_ms, int baudrate)
{
	uint64_t start;
	uint64_t time;
	uint64_t byte_delay_us;
	size_t ibuf, i;
	int len;
	const size_t maxlen = *buflen;

	if(maxlen < (packet_size << 1) ) {
		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 = 10000000 / 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;
		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("Serial detection took %li ms", time);
				*buflen = ibuf;
				return SR_OK;
			}
			/* Not a valid packet; continue searching */
			i++;
		}
		if (g_get_monotonic_time() - start > timeout_ms) {
			/* Timeout */
			sr_warn("Serial detection timeout");
			break;
		}
		g_usleep(byte_delay_us);
	}

	*buflen = ibuf;
	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	/**
	97	* Try to find a valid packet in a serial data stream
	98	*
	99	* @param fd File descriptor of the serial port.
	100	* @param buf Buffer containing the bytes to write.
	101	* @param count Size of the buffer.
	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 abort
	105	* scanning.
	106	* @param baudrate the baudrate of the serial port. This parameter is not
	107	* critical, but it helps fine tune the serial port polling
	108	* delay
	109	*
	110	* @return SR_OK if a valid packet is found within he given timeout,
	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,
	115	const size_t packet_size,
	116	packet_valid_t is_valid,
	117	uint64_t timeout_ms, int baudrate)
	118	{
	119	uint64_t start;
	120	uint64_t time;
	121	uint64_t byte_delay_us;
	122	size_t ibuf, i;
	123	int len;
	124	const size_t maxlen = *buflen;
	125
	126	if(maxlen < (packet_size << 1) ) {
	127	sr_err("Buffer size must be at least twice the packet size");
	128	return SR_ERR;
	129	}
	130
	131	timeout_ms *= 1000;
	132	/* Assume 8n1 transmission. That is 10 bits for every byte */
	133	byte_delay_us = 10000000 / baudrate;
	134	start = g_get_monotonic_time();
	135
	136	i = ibuf = len = 0;
	137	while (ibuf < maxlen) {
	138	len = serial_read(serial, &buf[ibuf], 1);
	139	if (len > 0)
	140	ibuf+= len;
	141	if ((ibuf - i) >= packet_size) {
	142	/* We have at least a packet's worth of data */
	143	if (is_valid(&buf[i])) {
	144	time = g_get_monotonic_time()-start;
	145	time /= 1000;
	146	sr_spew("Serial detection took %li ms", time);
	147	*buflen = ibuf;
	148	return SR_OK;
	149	}
	150	/* Not a valid packet; continue searching */
	151	i++;
	152	}
	153	if (g_get_monotonic_time() - start > timeout_ms) {
	154	/* Timeout */
	155	sr_warn("Serial detection timeout");
	156	break;
	157	}
158	g_usleep(byte_delay_us);
159	}
160
161	*buflen = ibuf;
162	return SR_ERR;
163
164	}
165
7dc55d93 AG	166	static GSList lcd14_scan(const char conn, const char *serialcomm)
	167	{
	168	struct sr_dev_inst *sdi;
	169	struct drv_context *drvc;
	170	struct dev_context *devc;
	171	struct sr_probe *probe;
d35afa87	172	struct sr_serial_dev_inst *serial;
7dc55d93	173	GSList *devices;
2546b05c AG	174	int dropped, ret;
	175	size_t len;
	176	uint8_t buf[128];
7dc55d93	177
d35afa87	178	if (!(serial = sr_serial_dev_inst_new(conn, serialcomm)))
7dc55d93	179	return NULL;
d35afa87 BV	180
d35afa87 BV	181	if (serial_open(serial, O_RDONLY\|O_NONBLOCK) != SR_OK)
7dc55d93	182	return NULL;
7dc55d93	183
bbabddbd	184	sr_info("Probing port %s readonly.", conn);
7dc55d93 AG	185
7dc55d93 AG	186	drvc = di->priv;
7dc55d93	187	devices = NULL;
d35afa87	188	serial_flush(serial);
bbabddbd UH	189
	190	/*
	191	* There's no way to get an ID from the multimeter. It just sends data
	192	* periodically, so the best we can do is check if the packets match
	193	* the expected format.
	194	*/
7dc55d93	195
2546b05c AG	196	/* Let's get a bit of data and see if we can find a packet. */
2546b05c AG	197	len = sizeof(buf);
7dc55d93	198
2546b05c AG	199	ret = serial_stream_detect(serial, buf, &len, FS9721_PACKET_SIZE,
	200	sr_fs9721_packet_valid, 1000, 2400);
	201	if (ret != SR_OK)
	202	goto scan_cleanup;
7dc55d93	203
2546b05c AG	204	/*
	205	* If we dropped more than two packets worth of data, something is
	206	* wrong. We shouldn't quit however, since the dropped bytes might be
	207	* just zeroes at the beginning of the stream. Those can occur as a
	208	* combination of the nonstandard cable that ships with this device and
	209	* the serial port or USB to serial adapter.
	210	*/
	211	dropped = len - FS9721_PACKET_SIZE;
	212	if (dropped > 2 * FS9721_PACKET_SIZE) {
7dc55d93	213
2546b05c AG	214	sr_warn("Had to drop too much data");
2546b05c AG	215	}
7dc55d93	216
2546b05c	217	sr_info("Found device on port %s.", conn);
7dc55d93	218
2546b05c AG	219	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "TekPower",
	220	"TP4000ZC", "")))
	221	goto scan_cleanup;
	222	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	223	sr_err("Device context malloc failed.");
	224	goto scan_cleanup;
7dc55d93 AG	225	}
7dc55d93 AG	226
2546b05c AG	227	devc->serial = serial;
	228
	229	sdi->priv = devc;
	230	sdi->driver = di;
	231	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	232	goto scan_cleanup;
	233	sdi->probes = g_slist_append(sdi->probes, probe);
	234	drvc->instances = g_slist_append(drvc->instances, sdi);
	235	devices = g_slist_append(devices, sdi);
	236
	237	scan_cleanup:
d35afa87	238	serial_close(serial);
2546b05c	239
7dc55d93 AG	240	return devices;
	241	}
	242
	243	static GSList hw_scan(GSList options)
	244	{
	245	struct sr_hwopt *opt;
	246	GSList l, devices;
	247	const char conn, serialcomm;
	248
	249	conn = serialcomm = NULL;
	250	for (l = options; l; l = l->next) {
	251	opt = l->data;
	252	switch (opt->hwopt) {
	253	case SR_HWOPT_CONN:
	254	conn = opt->value;
	255	break;
	256	case SR_HWOPT_SERIALCOMM:
	257	serialcomm = opt->value;
	258	break;
	259	}
	260	}
	261	if (!conn)
	262	return NULL;
	263
	264	if (serialcomm) {
	265	/* Use the provided comm specs. */
	266	devices = lcd14_scan(conn, serialcomm);
	267	} else {
d35afa87 BV	268	/* Try the default. */
d35afa87 BV	269	devices = lcd14_scan(conn, SERIALCOMM);
7dc55d93 AG	270	}
	271
	272	return devices;
	273	}
	274
	275	static GSList *hw_dev_list(void)
	276	{
	277	struct drv_context *drvc;
	278
	279	drvc = di->priv;
	280
	281	return drvc->instances;
	282	}
	283
	284	static int hw_dev_open(struct sr_dev_inst *sdi)
	285	{
	286	struct dev_context *devc;
	287
	288	if (!(devc = sdi->priv)) {
	289	sr_err("sdi->priv was NULL.");
	290	return SR_ERR_BUG;
	291	}
	292
d35afa87	293	if (serial_open(devc->serial, O_RDONLY) != SR_OK)
7dc55d93	294	return SR_ERR;
bbabddbd	295
7dc55d93 AG	296	sdi->status = SR_ST_ACTIVE;
	297
	298	return SR_OK;
	299	}
	300
	301	static int hw_dev_close(struct sr_dev_inst *sdi)
	302	{
	303	struct dev_context *devc;
	304
	305	if (!(devc = sdi->priv)) {
	306	sr_err("sdi->priv was NULL.");
	307	return SR_ERR_BUG;
	308	}
	309
	310	if (devc->serial && devc->serial->fd != -1) {
d35afa87	311	serial_close(devc->serial);
7dc55d93 AG	312	sdi->status = SR_ST_INACTIVE;
	313	}
	314
	315	return SR_OK;
	316	}
	317
	318	static int hw_cleanup(void)
	319	{
	320	clear_instances();
	321
	322	return SR_OK;
	323	}
	324
	325	static int hw_info_get(int info_id, const void **data,
bbabddbd	326	const struct sr_dev_inst *sdi)
7dc55d93	327	{
bbabddbd	328	(void)sdi;
7dc55d93 AG	329
	330	switch (info_id) {
	331	case SR_DI_HWOPTS:
	332	*data = hwopts;
	333	break;
	334	case SR_DI_HWCAPS:
	335	*data = hwcaps;
	336	break;
	337	case SR_DI_NUM_PROBES:
	338	*data = GINT_TO_POINTER(1);
	339	break;
	340	case SR_DI_PROBE_NAMES:
	341	*data = probe_names;
	342	break;
	343	default:
	344	return SR_ERR_ARG;
	345	}
	346
	347	return SR_OK;
	348	}
	349
	350	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
bbabddbd	351	const void *value)
7dc55d93 AG	352	{
	353	struct dev_context *devc;
	354
	355	if (sdi->status != SR_ST_ACTIVE)
	356	return SR_ERR;
	357
	358	if (!(devc = sdi->priv)) {
	359	sr_err("sdi->priv was NULL.");
	360	return SR_ERR_BUG;
	361	}
	362
	363	switch (hwcap) {
	364	case SR_HWCAP_LIMIT_SAMPLES:
	365	devc->limit_samples = (const uint64_t )value;
	366	sr_dbg("Setting sample limit to %" PRIu64 ".",
	367	devc->limit_samples);
	368	break;
	369	default:
	370	sr_err("Unknown capability: %d.", hwcap);
	371	return SR_ERR;
	372	break;
	373	}
	374
	375	return SR_OK;
	376	}
	377
	378	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
bbabddbd	379	void *cb_data)
7dc55d93 AG	380	{
	381	struct sr_datafeed_packet packet;
	382	struct sr_datafeed_header header;
	383	struct sr_datafeed_meta_analog meta;
	384	struct dev_context *devc;
	385
	386	if (!(devc = sdi->priv)) {
	387	sr_err("sdi->priv was NULL.");
	388	return SR_ERR_BUG;
	389	}
	390
	391	sr_dbg("Starting acquisition.");
	392
	393	devc->cb_data = cb_data;
	394
bbabddbd UH	395	/*
bbabddbd UH	396	* Reset the number of samples to take. If we've already collected our
7dc55d93	397	* quota, but we start a new session, and don't reset this, we'll just
bbabddbd UH	398	* quit without acquiring any new samples.
bbabddbd UH	399	*/
7dc55d93 AG	400	devc->num_samples = 0;
	401
	402	/* Send header packet to the session bus. */
	403	sr_dbg("Sending SR_DF_HEADER.");
	404	packet.type = SR_DF_HEADER;
	405	packet.payload = (uint8_t *)&header;
	406	header.feed_version = 1;
	407	gettimeofday(&header.starttime, NULL);
	408	sr_session_send(devc->cb_data, &packet);
	409
	410	/* Send metadata about the SR_DF_ANALOG packets to come. */
	411	sr_dbg("Sending SR_DF_META_ANALOG.");
	412	packet.type = SR_DF_META_ANALOG;
	413	packet.payload = &meta;
	414	meta.num_probes = 1;
	415	sr_session_send(devc->cb_data, &packet);
	416
bbabddbd	417	/* Poll every 50ms, or whenever some data comes in. */
7dc55d93	418	sr_source_add(devc->serial->fd, G_IO_IN, 50,
bbabddbd	419	tekpower_dmm_receive_data, (void *)sdi);
7dc55d93 AG	420
	421	return SR_OK;
	422	}
	423
69b07d14	424	static int hw_dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
7dc55d93 AG	425	{
	426	struct sr_datafeed_packet packet;
	427	struct dev_context *devc;
	428
	429	if (sdi->status != SR_ST_ACTIVE)
	430	return SR_ERR;
	431
	432	if (!(devc = sdi->priv)) {
	433	sr_err("sdi->priv was NULL.");
	434	return SR_ERR_BUG;
	435	}
	436
	437	sr_dbg("Stopping acquisition.");
	438
	439	sr_source_remove(devc->serial->fd);
	440	hw_dev_close((struct sr_dev_inst *)sdi);
	441
	442	/* Send end packet to the session bus. */
	443	sr_dbg("Sending SR_DF_END.");
	444	packet.type = SR_DF_END;
	445	sr_session_send(cb_data, &packet);
	446
	447	return SR_OK;
	448	}
	449
bbabddbd	450	SR_PRIV struct sr_dev_driver tekpower_dmm_driver_info = {
7dc55d93	451	.name = "tekpower-dmm",
bbabddbd	452	.longname = "TekPower/Digitek TP4000ZC/DT4000ZC DMM",
7dc55d93 AG	453	.api_version = 1,
	454	.init = hw_init,
	455	.cleanup = hw_cleanup,
	456	.scan = hw_scan,
	457	.dev_list = hw_dev_list,
	458	.dev_clear = clear_instances,
	459	.dev_open = hw_dev_open,
	460	.dev_close = hw_dev_close,
	461	.info_get = hw_info_get,
	462	.dev_config_set = hw_dev_config_set,
	463	.dev_acquisition_start = hw_dev_acquisition_start,
	464	.dev_acquisition_stop = hw_dev_acquisition_stop,
	465	.priv = NULL,
	466	};