[libsigrok.git] / hardware / radioshack-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 "libsigrok.h"
#include "libsigrok-internal.h"
#include "radioshack-dmm.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>

static const int hwopts[] = {
	SR_HWOPT_CONN,
	SR_HWOPT_SERIALCOMM,
	0,
};

static const int hwcaps[] = {
	SR_HWCAP_MULTIMETER,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_CONTINUOUS,
	0,
};

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

SR_PRIV struct sr_dev_driver radioshackdmm_driver_info;
static struct sr_dev_driver *di = &radioshackdmm_driver_info;

static const struct radioshackdmm_profile supported_radioshackdmm[] = {
	{ RADIOSHACK_22_812, "22-812", 100 },
};


/* 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("radioshack-dmm: driver context malloc failed.");
		return SR_ERR;
	}

	di->priv = drvc;

	return SR_OK;
}

static int serial_readline(int fd, char **buf, size_t *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 *rs_22_812_scan(const char *conn, const char *serialcomm)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_probe *probe;
	GSList *devices;
	int fd, retry;
	size_t len;
	char buf[128], *b;

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

	sr_info("radioshack-dmm: probing port %s readonly", conn);

	drvc = di->priv;
	b = buf;
	retry = 0;
	devices = NULL;
	/* 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)
	{
		size_t i;
		size_t good_packets = 0;
		retry++;
		serial_flush(fd);

		/* Let's get a bit of data and see if we can find a packet */
		len = sizeof(buf);
		serial_readline(fd, &b, &len, 250);
		if( (len == 0) || (len < RS_22_812_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 - RS_22_812_PACKET_SIZE + 1;
		    /* don't increment i here */ )
		{
			const rs_22_812_packet *packet = (void *)(&buf[i]);
			if( !rs_22_812_is_packet_valid(packet) ){
				i++;
				continue;
			}
			good_packets++;
			i += RS_22_812_PACKET_SIZE;
		}

		/* If we dropped more than two packets worth of data, something
		 * is wrong */
		size_t dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
		if(dropped > 2 * RS_22_812_PACKET_SIZE)
			continue;

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

		sr_info("radioshack-dmm: found RS 22-812 on port %s", conn);

		if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Radioshack",
					    "22-812", "")))
			return NULL;
		if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
			sr_dbg("radioshack-dmm: failed to malloc devc");
			return NULL;
		}

		/* devc->profile = RADIOSHACK_22_812; */
		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 = rs_22_812_scan(conn, serialcomm);
	} else {
		/* Then try the default 4800 8n1 */
		devices = rs_22_812_scan(conn, "4800/8n1");
	}

	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)
{
	struct dev_context *devc;

	if (!(devc = sdi->priv)) {
		sr_err("radioshack-dmm: 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("radioshack-dmm: Couldn't open serial port '%s'.",
		       devc->serial->port);
		return SR_ERR;
	}
	if (serial_set_paramstr(devc->serial->fd, devc->serialcomm) != SR_OK) {
		sr_err("radioshack-dmm: unable to set serial parameters");
		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("radioshack-dmm: sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	if (devc->serial && devc->serial->fd != -1) {
		serial_close(devc->serial->fd);
		devc->serial->fd = -1;
		sdi->status = SR_ST_INACTIVE;
	}

	return SR_OK;
}

static int hw_cleanup(void)
{
	clear_instances();

	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
       const struct sr_dev_inst *sdi)
{
	(void)sdi; /* Does nothing. prevents "unused parameter" warning */

	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("radioshack-dmm: sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	switch (hwcap) {
	case SR_HWCAP_LIMIT_SAMPLES:
		devc->limit_samples = *(const uint64_t *)value;
		sr_dbg("radioshack-dmm: Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	default:
		sr_err("radioshack-dmm: Unknown capability: %d.", hwcap);
		return SR_ERR;
		break;
	}

	return SR_OK;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_analog meta;
	struct dev_context *devc;

	if (!(devc = sdi->priv)) {
		sr_err("radioshack-dmm: sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("radioshack-dmm: 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 aquiring any new samples */
	devc->num_samples = 0;

	/* Send header packet to the session bus. */
	sr_dbg("radioshack-dmm: Sending SR_DF_HEADER.");
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);
	sr_session_send(devc->cb_data, &packet);

	/* Send metadata about the SR_DF_ANALOG packets to come. */
	sr_dbg("radioshack-dmm: Sending SR_DF_META_ANALOG.");
	packet.type = SR_DF_META_ANALOG;
	packet.payload = &meta;
	meta.num_probes = 1;
	sr_session_send(devc->cb_data, &packet);

	/* Poll every 100ms, or whenever some data comes in. */
	sr_source_add(devc->serial->fd, G_IO_IN, 50,
		      radioshack_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("radioshack-dmm: sdi->priv was NULL.");
		return SR_ERR_BUG;
	}

	sr_dbg("radioshack-dmm: Stopping acquisition.");

	sr_source_remove(devc->serial->fd);
	hw_dev_close((struct sr_dev_inst *)sdi);

	/* Send end packet to the session bus. */
	sr_dbg("radioshack-dmm: Sending SR_DF_END.");
	packet.type = SR_DF_END;
	sr_session_send(cb_data, &packet);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver radioshackdmm_driver_info = {
	.name = "radioshack-dmm",
	.longname = "Radioshack 22-812/22-039 DMMs",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.scan = hw_scan,
	.dev_list = hw_dev_list,
	.dev_clear = clear_instances,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
d375b3c3 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>
7b0a85c8	22	#include "libsigrok.h"
d375b3c3	23	#include "libsigrok-internal.h"
d375b3c3 AG	24	#include "radioshack-dmm.h"
	25	#include <sys/types.h>
	26	#include <sys/stat.h>
	27	#include <fcntl.h>
	28	#include <string.h>
	29	#include <errno.h>
	30
	31	static const int hwopts[] = {
	32	SR_HWOPT_CONN,
	33	SR_HWOPT_SERIALCOMM,
	34	0,
	35	};
	36
	37	static const int hwcaps[] = {
	38	SR_HWCAP_MULTIMETER,
	39	SR_HWCAP_LIMIT_SAMPLES,
	40	SR_HWCAP_CONTINUOUS,
	41	0,
	42	};
	43
	44	static const char *probe_names[] = {
	45	"Probe",
	46	NULL,
	47	};
	48
	49	SR_PRIV struct sr_dev_driver radioshackdmm_driver_info;
	50	static struct sr_dev_driver *di = &radioshackdmm_driver_info;
	51
	52	static const struct radioshackdmm_profile supported_radioshackdmm[] = {
	53	{ RADIOSHACK_22_812, "22-812", 100 },
	54	};
	55
	56
	57	/* Properly close and free all devices. */
	58	static int clear_instances(void)
	59	{
	60	struct sr_dev_inst *sdi;
	61	struct drv_context *drvc;
	62	struct dev_context *devc;
	63	GSList *l;
	64
	65	if (!(drvc = di->priv))
	66	return SR_OK;
	67
	68	drvc = di->priv;
	69	for (l = drvc->instances; l; l = l->next) {
	70	if (!(sdi = l->data))
	71	continue;
	72	if (!(devc = sdi->priv))
	73	continue;
	74	sr_serial_dev_inst_free(devc->serial);
	75	sr_dev_inst_free(sdi);
	76	}
	77	g_slist_free(drvc->instances);
	78	drvc->instances = NULL;
	79
	80	return SR_OK;
	81	}
	82
	83	static int hw_init(void)
	84	{
	85	struct drv_context *drvc;
	86
	87	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
88	sr_err("radioshack-dmm: driver context malloc failed.");
89	return SR_ERR;
90	}
91
92	di->priv = drvc;
93
94	return SR_OK;
95	}
96
97	static int serial_readline(int fd, char *buf, size_t buflen,
98	uint64_t timeout_ms)
99	{
100	uint64_t start;
101	int maxlen, len;
102
103	timeout_ms *= 1000;
104	start = g_get_monotonic_time();
105
106	maxlen = *buflen;
107	*buflen = len = 0;
108	while(1) {
109	len = maxlen - *buflen - 1;
110	if (len < 1)
111	break;
112	len = serial_read(fd, buf + buflen, 1);
113	if (len > 0) {
114	*buflen += len;
115	(buf + *buflen) = '\0';
116	if (buflen > 0 && (buf + buflen - 1) == '\r') {
117	/* Strip LF and terminate. */
118	(buf + --*buflen) = '\0';
119	break;
120	}
121	}
122	if (g_get_monotonic_time() - start > timeout_ms)
123	/* Timeout */
124	break;
125	g_usleep(2000);
126	}
127
128	return SR_OK;
129	}
130
131	static GSList rs_22_812_scan(const char conn, const char *serialcomm)
132	{
133	struct sr_dev_inst *sdi;
134	struct drv_context *drvc;
135	struct dev_context *devc;
136	struct sr_probe *probe;
137	GSList *devices;
138	int fd, retry;
139	size_t len;
140	char buf[128], *b;
141
be8dbf3a	142	if ((fd = serial_open(conn, O_RDONLY\|O_NONBLOCK)) == -1) {
d375b3c3 AG	143	sr_err("radioshack-dmm: unable to open %s: %s",
	144	conn, strerror(errno));
	145	return NULL;
	146	}
	147	if (serial_set_paramstr(fd, serialcomm) != SR_OK) {
	148	sr_err("radioshack-dmm: unable to set serial parameters");
	149	return NULL;
	150	}
	151
be8dbf3a AG	152	sr_info("radioshack-dmm: probing port %s readonly", conn);
be8dbf3a AG	153
d375b3c3 AG	154	drvc = di->priv;
	155	b = buf;
	156	retry = 0;
	157	devices = NULL;
	158	/* There's no way to get an ID from the multimeter. It just sends data
	159	* periodically, so the best we can do is check if the packets match the
	160	* expected format. */
	161	while (!devices && retry < 3)
	162	{
	163	size_t i;
	164	size_t good_packets = 0;
	165	retry++;
	166	serial_flush(fd);
	167
	168	/* Let's get a bit of data and see if we can find a packet */
	169	len = sizeof(buf);
	170	serial_readline(fd, &b, &len, 250);
	171	if( (len == 0) \|\| (len < RS_22_812_PACKET_SIZE) ) {
	172	/* Not enough data received, is the DMM connected ? */
	173	continue;
	174	}
	175
	176	/* Let's treat our buffer like a stream, and find any
	177	* valid packets */
	178	for( i = 0; i < len - RS_22_812_PACKET_SIZE + 1;
	179	/* don't increment i here */ )
	180	{
	181	const rs_22_812_packet packet = (void )(&buf[i]);
	182	if( !rs_22_812_is_packet_valid(packet) ){
	183	i++;
	184	continue;
	185	}
	186	good_packets++;
	187	i += RS_22_812_PACKET_SIZE;
	188	}
	189
	190	/* If we dropped more than two packets worth of data, something
	191	* is wrong */
	192	size_t dropped = len - (good_packets * RS_22_812_PACKET_SIZE);
	193	if(dropped > 2 * RS_22_812_PACKET_SIZE)
	194	continue;
	195
	196	/* Let's see if we have anything good */
	197	if (good_packets == 0)
	198	continue;
	199
be8dbf3a AG	200	sr_info("radioshack-dmm: found RS 22-812 on port %s", conn);
be8dbf3a AG	201
d375b3c3 AG	202	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, "Radioshack",
	203	"22-812", "")))
	204	return NULL;
	205	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	206	sr_dbg("radioshack-dmm: failed to malloc devc");
	207	return NULL;
	208	}
	209
	210	/* devc->profile = RADIOSHACK_22_812; */
	211	devc->serial = sr_serial_dev_inst_new(conn, -1);
	212	devc->serialcomm = g_strdup(serialcomm);
	213
	214	sdi->priv = devc;
	215	sdi->driver = di;
	216	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	217	return NULL;
	218	sdi->probes = g_slist_append(sdi->probes, probe);
	219	drvc->instances = g_slist_append(drvc->instances, sdi);
	220	devices = g_slist_append(devices, sdi);
	221	break;
	222
	223	}
	224	serial_close(fd);
	225
	226	return devices;
	227	}
	228
	229	static GSList hw_scan(GSList options)
	230	{
	231	struct sr_hwopt *opt;
	232	GSList l, devices;
	233	const char conn, serialcomm;
	234
	235	conn = serialcomm = NULL;
	236	for (l = options; l; l = l->next) {
	237	opt = l->data;
	238	switch (opt->hwopt) {
	239	case SR_HWOPT_CONN:
	240	conn = opt->value;
	241	break;
	242	case SR_HWOPT_SERIALCOMM:
	243	serialcomm = opt->value;
	244	break;
	245	}
	246	}
	247	if (!conn)
	248	return NULL;
	249
	250	if (serialcomm) {
	251	/* Use the provided comm specs. */
	252	devices = rs_22_812_scan(conn, serialcomm);
	253	} else {
	254	/* Then try the default 4800 8n1 */
	255	devices = rs_22_812_scan(conn, "4800/8n1");
	256	}
	257
	258	return devices;
	259	}
	260
	261	static GSList *hw_dev_list(void)
	262	{
	263	struct drv_context *drvc;
	264
	265	drvc = di->priv;
266
267	return drvc->instances;
268	}
269
270	static int hw_dev_open(struct sr_dev_inst *sdi)
271	{
272	struct dev_context *devc;
273
274	if (!(devc = sdi->priv)) {
275	sr_err("radioshack-dmm: sdi->priv was NULL.");
276	return SR_ERR_BUG;
277	}
278
be8dbf3a	279	devc->serial->fd = serial_open(devc->serial->port, O_RDONLY);
d375b3c3 AG	280	if (devc->serial->fd == -1) {
	281	sr_err("radioshack-dmm: Couldn't open serial port '%s'.",
	282	devc->serial->port);
	283	return SR_ERR;
	284	}
	285	if (serial_set_paramstr(devc->serial->fd, devc->serialcomm) != SR_OK) {
	286	sr_err("radioshack-dmm: unable to set serial parameters");
	287	return SR_ERR;
	288	}
	289	sdi->status = SR_ST_ACTIVE;
	290
	291	return SR_OK;
	292	}
	293
	294	static int hw_dev_close(struct sr_dev_inst *sdi)
	295	{
	296	struct dev_context *devc;
	297
	298	if (!(devc = sdi->priv)) {
	299	sr_err("radioshack-dmm: sdi->priv was NULL.");
	300	return SR_ERR_BUG;
	301	}
	302
	303	if (devc->serial && devc->serial->fd != -1) {
	304	serial_close(devc->serial->fd);
	305	devc->serial->fd = -1;
	306	sdi->status = SR_ST_INACTIVE;
	307	}
	308
	309	return SR_OK;
	310	}
	311
	312	static int hw_cleanup(void)
	313	{
	314	clear_instances();
	315
	316	return SR_OK;
	317	}
	318
	319	static int hw_info_get(int info_id, const void **data,
	320	const struct sr_dev_inst *sdi)
	321	{
	322	(void)sdi; /* Does nothing. prevents "unused parameter" warning */
	323
	324	switch (info_id) {
	325	case SR_DI_HWOPTS:
	326	*data = hwopts;
	327	break;
	328	case SR_DI_HWCAPS:
	329	*data = hwcaps;
	330	break;
	331	case SR_DI_NUM_PROBES:
	332	*data = GINT_TO_POINTER(1);
	333	break;
	334	case SR_DI_PROBE_NAMES:
	335	*data = probe_names;
	336	break;
	337	default:
	338	return SR_ERR_ARG;
	339	}
	340
	341	return SR_OK;
	342	}
	343
344	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
345	const void *value)
346	{
347	struct dev_context *devc;
348
349	if (sdi->status != SR_ST_ACTIVE)
350	return SR_ERR;
351
352	if (!(devc = sdi->priv)) {
353	sr_err("radioshack-dmm: sdi->priv was NULL.");
354	return SR_ERR_BUG;
355	}
356
357	switch (hwcap) {
358	case SR_HWCAP_LIMIT_SAMPLES:
359	devc->limit_samples = (const uint64_t )value;
360	sr_dbg("radioshack-dmm: Setting sample limit to %" PRIu64 ".",
361	devc->limit_samples);
362	break;
363	default:
364	sr_err("radioshack-dmm: Unknown capability: %d.", hwcap);
365	return SR_ERR;
366	break;
367	}
368
369	return SR_OK;
370	}
371
372	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
373	void *cb_data)
374	{
375	struct sr_datafeed_packet packet;
376	struct sr_datafeed_header header;
377	struct sr_datafeed_meta_analog meta;
378	struct dev_context *devc;
379
380	if (!(devc = sdi->priv)) {
381	sr_err("radioshack-dmm: sdi->priv was NULL.");
382	return SR_ERR_BUG;
383	}
384
385	sr_dbg("radioshack-dmm: Starting acquisition.");
386
387	devc->cb_data = cb_data;
388
be8dbf3a AG	389	/* Reset the number of samples to take. If we've already collected our
	390	* quota, but we start a new session, and don't reset this, we'll just
	391	* quit without aquiring any new samples */
	392	devc->num_samples = 0;
	393
d375b3c3 AG	394	/* Send header packet to the session bus. */
	395	sr_dbg("radioshack-dmm: Sending SR_DF_HEADER.");
	396	packet.type = SR_DF_HEADER;
	397	packet.payload = (uint8_t *)&header;
	398	header.feed_version = 1;
	399	gettimeofday(&header.starttime, NULL);
	400	sr_session_send(devc->cb_data, &packet);
	401
	402	/* Send metadata about the SR_DF_ANALOG packets to come. */
	403	sr_dbg("radioshack-dmm: Sending SR_DF_META_ANALOG.");
	404	packet.type = SR_DF_META_ANALOG;
	405	packet.payload = &meta;
	406	meta.num_probes = 1;
	407	sr_session_send(devc->cb_data, &packet);
	408
	409	/* Poll every 100ms, or whenever some data comes in. */
	410	sr_source_add(devc->serial->fd, G_IO_IN, 50,
	411	radioshack_receive_data, (void *)sdi );
	412
	413	return SR_OK;
	414	}
	415
	416	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
	417	void *cb_data)
	418	{
	419	struct sr_datafeed_packet packet;
	420	struct dev_context *devc;
	421
	422	if (sdi->status != SR_ST_ACTIVE)
	423	return SR_ERR;
	424
	425	if (!(devc = sdi->priv)) {
	426	sr_err("radioshack-dmm: sdi->priv was NULL.");
	427	return SR_ERR_BUG;
	428	}
	429
	430	sr_dbg("radioshack-dmm: Stopping acquisition.");
	431
	432	sr_source_remove(devc->serial->fd);
	433	hw_dev_close((struct sr_dev_inst *)sdi);
	434
	435	/* Send end packet to the session bus. */
	436	sr_dbg("radioshack-dmm: Sending SR_DF_END.");
	437	packet.type = SR_DF_END;
	438	sr_session_send(cb_data, &packet);
	439
	440	return SR_OK;
	441	}
	442
	443	SR_PRIV struct sr_dev_driver radioshackdmm_driver_info = {
	444	.name = "radioshack-dmm",
	445	.longname = "Radioshack 22-812/22-039 DMMs",
	446	.api_version = 1,
	447	.init = hw_init,
	448	.cleanup = hw_cleanup,
	449	.scan = hw_scan,
	450	.dev_list = hw_dev_list,
	451	.dev_clear = clear_instances,
	452	.dev_open = hw_dev_open,
	453	.dev_close = hw_dev_close,
	454	.info_get = hw_info_get,
	455	.dev_config_set = hw_dev_config_set,
	456	.dev_acquisition_start = hw_dev_acquisition_start,
	457	.dev_acquisition_stop = hw_dev_acquisition_stop,
458	.priv = NULL,
459	};