[libsigrok.git] / hardware / uni-t-dmm / api.c

/*
 * This file is part of the sigrok project.
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdlib.h>
#include <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"

/* Note: The order here must match the DMM/device enum in protocol.h. */
static const char *dev_names[] = {
	"UNI-T UT61D",
	"Voltcraft VC-820",
};

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

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

SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
static struct sr_dev_driver *di_ut61d = &uni_t_ut61d_driver_info;

SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
static struct sr_dev_driver *di_vc820 = &voltcraft_vc820_driver_info;

static int open_usb(struct sr_dev_inst *sdi)
{
	libusb_device **devlist;
	struct libusb_device_descriptor des;
	struct dev_context *devc;
	int ret, tmp, cnt, i;

	/* TODO: Use common code later, refactor. */

	devc = sdi->priv;

	if ((cnt = libusb_get_device_list(NULL, &devlist)) < 0) {
		sr_err("Error getting USB device list: %d.", cnt);
		return SR_ERR;
	}

	ret = SR_ERR;
	for (i = 0; i < cnt; i++) {
		if ((tmp = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("Failed to get device descriptor: %d.", tmp);
			continue;
		}

		if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
			|| libusb_get_device_address(devlist[i]) != devc->usb->address)
			continue;

		if ((tmp = libusb_open(devlist[i], &devc->usb->devhdl))) {
			sr_err("Failed to open device: %d.", tmp);
			break;
		}

		sr_info("Opened USB device on %d.%d.",
			devc->usb->bus, devc->usb->address);
		ret = SR_OK;
		break;
	}
	libusb_free_device_list(devlist, 1);

	return ret;
}

static GSList *connect_usb(const char *conn, int dmm)
{
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_probe *probe;
	libusb_device **devlist;
	struct libusb_device_descriptor des;
	GSList *devices;
	int vid, pid, devcnt, err, i;

	(void)conn;

	/* TODO: Use common code later, refactor. */

	if (dmm == UNI_T_UT61D)
		drvc = di_ut61d->priv;
	else if (dmm == VOLTCRAFT_VC820)
		drvc = di_vc820->priv;

	/* Hardcoded for now. */
	vid = UT_D04_CABLE_USB_VID;
	pid = UT_D04_CABLE_USB_DID;

	devices = NULL;
	libusb_get_device_list(NULL, &devlist);
	for (i = 0; devlist[i]; i++) {
		if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("Failed to get device descriptor: %d", err);
			continue;
		}

		if (des.idVendor != vid || des.idProduct != pid)
			continue;

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

		devcnt = g_slist_length(drvc->instances);
		if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
					    dev_names[dmm], NULL, NULL))) {
			sr_err("sr_dev_inst_new returned NULL.");
			return NULL;
		}
		sdi->priv = devc;
		if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
			return NULL;
		sdi->probes = g_slist_append(sdi->probes, probe);
		devc->usb = sr_usb_dev_inst_new(
				libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL);
		devices = g_slist_append(devices, sdi);
	}
	libusb_free_device_list(devlist, 1);

	return devices;
}

static int clear_instances(void)
{
	/* TODO: Use common code later. */

	return SR_OK;
}

static int hw_init(int dmm)
{
	int ret;
	struct drv_context *drvc;

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

	if ((ret = libusb_init(NULL)) < 0) {
		sr_err("Failed to initialize libusb: %s.",
		       libusb_error_name(ret));
		return SR_ERR;
	}

	if (dmm == UNI_T_UT61D)
		di_ut61d->priv = drvc;
	else if (dmm == VOLTCRAFT_VC820)
		di_vc820->priv = drvc;

	return SR_OK;
}

static int hw_init_ut61d(void)
{
	return hw_init(UNI_T_UT61D);
}

static int hw_init_vc820(void)
{
	return hw_init(VOLTCRAFT_VC820);
}

static GSList *hw_scan(GSList *options, int dmm)
{
	GSList *l, *devices;
	struct sr_dev_inst *sdi;
	struct drv_context *drvc;

	(void)options;

	if (dmm == UNI_T_UT61D)
		drvc = di_ut61d->priv;
	else if (dmm == VOLTCRAFT_VC820)
		drvc = di_vc820->priv;

	if (!(devices = connect_usb(NULL, dmm)))
		return NULL;

	for (l = devices; l; l = l->next) {
		sdi = l->data;

		if (dmm == UNI_T_UT61D)
			sdi->driver = di_ut61d;
		else if (dmm == VOLTCRAFT_VC820)
			sdi->driver = di_vc820;

		drvc->instances = g_slist_append(drvc->instances, l->data);
	}

	return devices;
}

static GSList *hw_scan_ut61d(GSList *options)
{
	return hw_scan(options, UNI_T_UT61D);
}

static GSList *hw_scan_vc820(GSList *options)
{
	return hw_scan(options, VOLTCRAFT_VC820);
}

static GSList *hw_dev_list(int dmm)
{
	struct drv_context *drvc;

	if (dmm == UNI_T_UT61D)
		drvc = di_ut61d->priv;
	else if (dmm == VOLTCRAFT_VC820)
		drvc = di_vc820->priv;

	return drvc->instances;
}

static GSList *hw_dev_list_ut61d(void)
{
	return hw_dev_list(UNI_T_UT61D);
}

static GSList *hw_dev_list_vc820(void)
{
	return hw_dev_list(VOLTCRAFT_VC820);
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	return open_usb(sdi);
}

static int hw_dev_close(struct sr_dev_inst *sdi)
{
	(void)sdi;

	/* TODO */

	return SR_OK;
}

static int hw_cleanup(void)
{
	clear_instances();

	// libusb_exit(NULL);

	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
		       const struct sr_dev_inst *sdi)
{
	(void)sdi;

	sr_spew("Backend requested info_id %d.", info_id);

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		sr_spew("%s: Returning hwcaps.", __func__);
		break;
	case SR_DI_NUM_PROBES:
		*data = GINT_TO_POINTER(1);
		sr_spew("%s: Returning number of probes.", __func__);
		break;
	case SR_DI_PROBE_NAMES:
		*data = probe_names;
		sr_spew("%s: Returning probe names.", __func__);
		break;
	case SR_DI_SAMPLERATES:
		/* TODO: Get rid of this. */
		*data = NULL;
		sr_spew("%s: Returning samplerates.", __func__);
		return SR_ERR_ARG;
		break;
	case SR_DI_CUR_SAMPLERATE:
		/* TODO: Get rid of this. */
		*data = NULL;
		sr_spew("%s: Returning current samplerate.", __func__);
		return SR_ERR_ARG;
		break;
	default:
		sr_err("%s: Unknown info_id %d.", __func__, info_id);
		return SR_ERR_ARG;
		break;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
			     const void *value)
{
	struct dev_context *devc;

	devc = sdi->priv;

	switch (hwcap) {
	case SR_HWCAP_LIMIT_MSEC:
		/* TODO: Not yet implemented. */
		if (*(const uint64_t *)value == 0) {
			sr_err("Time limit cannot be 0.");
			return SR_ERR;
		}
		devc->limit_msec = *(const uint64_t *)value;
		sr_dbg("Setting time limit to %" PRIu64 "ms.",
		       devc->limit_msec);
		break;
	case SR_HWCAP_LIMIT_SAMPLES:
		if (*(const uint64_t *)value == 0) {
			sr_err("Sample limit cannot be 0.");
			return SR_ERR;
		}
		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,
				    int dmm, void *cb_data)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;
	struct sr_datafeed_meta_analog meta;
	struct dev_context *devc;

	devc = sdi->priv;

	sr_dbg("Starting acquisition.");

	devc->cb_data = cb_data;

	/* 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 (dmm == UNI_T_UT61D) {
		sr_source_add(0, 0, 10 /* poll_timeout */,
			      uni_t_ut61d_receive_data, (void *)sdi);
	} else if (dmm == VOLTCRAFT_VC820) {
		sr_source_add(0, 0, 10 /* poll_timeout */,
			      voltcraft_vc820_receive_data, (void *)sdi);
	}

	return SR_OK;
}

static int hw_dev_acquisition_start_ut61d(const struct sr_dev_inst *sdi,
					  void *cb_data)
{
	return hw_dev_acquisition_start(sdi, UNI_T_UT61D, cb_data);
}

static int hw_dev_acquisition_start_vc820(const struct sr_dev_inst *sdi,
					  void *cb_data)
{
	return hw_dev_acquisition_start(sdi, VOLTCRAFT_VC820, cb_data);
}

static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
				   void *cb_data)
{
	struct sr_datafeed_packet packet;

	(void)sdi;

	sr_dbg("Stopping acquisition.");

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

	/* TODO? */
	sr_source_remove(0);

	return SR_OK;
}

SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info = {
	.name = "uni-t-ut61d",
	.longname = "UNI-T UT61D",
	.api_version = 1,
	.init = hw_init_ut61d,
	.cleanup = hw_cleanup,
	.scan = hw_scan_ut61d,
	.dev_list = hw_dev_list_ut61d,
	.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_ut61d,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};

SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info = {
	.name = "voltcraft-vc820",
	.longname = "Voltcraft VC-820",
	.api_version = 1,
	.init = hw_init_vc820,
	.cleanup = hw_cleanup,
	.scan = hw_scan_vc820,
	.dev_list = hw_dev_list_vc820,
	.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_vc820,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
79081ec8 UH	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <stdlib.h>
	22	#include <string.h>
	23	#include "libsigrok.h"
	24	#include "libsigrok-internal.h"
	25	#include "protocol.h"
	26
fdbcb86d UH	27	/* Note: The order here must match the DMM/device enum in protocol.h. */
	28	static const char *dev_names[] = {
	29	"UNI-T UT61D",
	30	"Voltcraft VC-820",
	31	};
	32
79081ec8 UH	33	static const int hwcaps[] = {
	34	SR_HWCAP_MULTIMETER,
	35	SR_HWCAP_LIMIT_SAMPLES,
	36	SR_HWCAP_LIMIT_MSEC,
	37	SR_HWCAP_CONTINUOUS,
	38	0,
	39	};
	40
	41	static const char *probe_names[] = {
	42	"Probe",
	43	NULL,
	44	};
	45
fdbcb86d UH	46	SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
	47	static struct sr_dev_driver *di_ut61d = &uni_t_ut61d_driver_info;
	48
	49	SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
	50	static struct sr_dev_driver *di_vc820 = &voltcraft_vc820_driver_info;
79081ec8 UH	51
	52	static int open_usb(struct sr_dev_inst *sdi)
	53	{
	54	libusb_device **devlist;
	55	struct libusb_device_descriptor des;
	56	struct dev_context *devc;
	57	int ret, tmp, cnt, i;
	58
	59	/* TODO: Use common code later, refactor. */
	60
	61	devc = sdi->priv;
	62
	63	if ((cnt = libusb_get_device_list(NULL, &devlist)) < 0) {
	64	sr_err("Error getting USB device list: %d.", cnt);
	65	return SR_ERR;
	66	}
	67
	68	ret = SR_ERR;
	69	for (i = 0; i < cnt; i++) {
	70	if ((tmp = libusb_get_device_descriptor(devlist[i], &des))) {
	71	sr_err("Failed to get device descriptor: %d.", tmp);
	72	continue;
	73	}
	74
	75	if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
	76	\|\| libusb_get_device_address(devlist[i]) != devc->usb->address)
	77	continue;
	78
	79	if ((tmp = libusb_open(devlist[i], &devc->usb->devhdl))) {
	80	sr_err("Failed to open device: %d.", tmp);
	81	break;
	82	}
	83
	84	sr_info("Opened USB device on %d.%d.",
	85	devc->usb->bus, devc->usb->address);
	86	ret = SR_OK;
	87	break;
	88	}
	89	libusb_free_device_list(devlist, 1);
	90
	91	return ret;
	92	}
	93
fdbcb86d	94	static GSList connect_usb(const char conn, int dmm)
79081ec8 UH	95	{
	96	struct sr_dev_inst *sdi;
	97	struct drv_context *drvc;
	98	struct dev_context *devc;
	99	struct sr_probe *probe;
	100	libusb_device **devlist;
	101	struct libusb_device_descriptor des;
	102	GSList *devices;
	103	int vid, pid, devcnt, err, i;
	104
	105	(void)conn;
	106
	107	/* TODO: Use common code later, refactor. */
	108
fdbcb86d UH	109	if (dmm == UNI_T_UT61D)
	110	drvc = di_ut61d->priv;
	111	else if (dmm == VOLTCRAFT_VC820)
	112	drvc = di_vc820->priv;
79081ec8 UH	113
	114	/* Hardcoded for now. */
	115	vid = UT_D04_CABLE_USB_VID;
	116	pid = UT_D04_CABLE_USB_DID;
	117
	118	devices = NULL;
	119	libusb_get_device_list(NULL, &devlist);
	120	for (i = 0; devlist[i]; i++) {
	121	if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
	122	sr_err("Failed to get device descriptor: %d", err);
	123	continue;
	124	}
	125
	126	if (des.idVendor != vid \|\| des.idProduct != pid)
	127	continue;
	128
	129	if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
	130	sr_err("Device context malloc failed.");
	131	return NULL;
	132	}
	133
	134	devcnt = g_slist_length(drvc->instances);
	135	if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
fdbcb86d	136	dev_names[dmm], NULL, NULL))) {
79081ec8 UH	137	sr_err("sr_dev_inst_new returned NULL.");
	138	return NULL;
	139	}
	140	sdi->priv = devc;
	141	if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
	142	return NULL;
	143	sdi->probes = g_slist_append(sdi->probes, probe);
	144	devc->usb = sr_usb_dev_inst_new(
	145	libusb_get_bus_number(devlist[i]),
	146	libusb_get_device_address(devlist[i]), NULL);
	147	devices = g_slist_append(devices, sdi);
	148	}
	149	libusb_free_device_list(devlist, 1);
	150
	151	return devices;
	152	}
	153
	154	static int clear_instances(void)
	155	{
	156	/* TODO: Use common code later. */
	157
	158	return SR_OK;
	159	}
	160
fdbcb86d	161	static int hw_init(int dmm)
79081ec8 UH	162	{
	163	int ret;
	164	struct drv_context *drvc;
	165
	166	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
	167	sr_err("Driver context malloc failed.");
	168	return SR_ERR_MALLOC;
	169	}
	170
	171	if ((ret = libusb_init(NULL)) < 0) {
	172	sr_err("Failed to initialize libusb: %s.",
	173	libusb_error_name(ret));
	174	return SR_ERR;
	175	}
	176
fdbcb86d UH	177	if (dmm == UNI_T_UT61D)
	178	di_ut61d->priv = drvc;
	179	else if (dmm == VOLTCRAFT_VC820)
	180	di_vc820->priv = drvc;
79081ec8 UH	181
	182	return SR_OK;
	183	}
	184
fdbcb86d UH	185	static int hw_init_ut61d(void)
	186	{
	187	return hw_init(UNI_T_UT61D);
	188	}
	189
	190	static int hw_init_vc820(void)
	191	{
	192	return hw_init(VOLTCRAFT_VC820);
	193	}
	194
	195	static GSList hw_scan(GSList options, int dmm)
79081ec8 UH	196	{
	197	GSList l, devices;
	198	struct sr_dev_inst *sdi;
	199	struct drv_context *drvc;
	200
	201	(void)options;
	202
fdbcb86d UH	203	if (dmm == UNI_T_UT61D)
	204	drvc = di_ut61d->priv;
	205	else if (dmm == VOLTCRAFT_VC820)
	206	drvc = di_vc820->priv;
79081ec8	207
fdbcb86d	208	if (!(devices = connect_usb(NULL, dmm)))
79081ec8 UH	209	return NULL;
	210
	211	for (l = devices; l; l = l->next) {
	212	sdi = l->data;
fdbcb86d UH	213
	214	if (dmm == UNI_T_UT61D)
	215	sdi->driver = di_ut61d;
	216	else if (dmm == VOLTCRAFT_VC820)
	217	sdi->driver = di_vc820;
	218
79081ec8 UH	219	drvc->instances = g_slist_append(drvc->instances, l->data);
	220	}
	221
	222	return devices;
	223	}
	224
fdbcb86d UH	225	static GSList hw_scan_ut61d(GSList options)
	226	{
	227	return hw_scan(options, UNI_T_UT61D);
	228	}
	229
	230	static GSList hw_scan_vc820(GSList options)
	231	{
	232	return hw_scan(options, VOLTCRAFT_VC820);
	233	}
	234
	235	static GSList *hw_dev_list(int dmm)
79081ec8 UH	236	{
	237	struct drv_context *drvc;
	238
fdbcb86d UH	239	if (dmm == UNI_T_UT61D)
	240	drvc = di_ut61d->priv;
	241	else if (dmm == VOLTCRAFT_VC820)
	242	drvc = di_vc820->priv;
79081ec8 UH	243
	244	return drvc->instances;
	245	}
	246
fdbcb86d UH	247	static GSList *hw_dev_list_ut61d(void)
	248	{
	249	return hw_dev_list(UNI_T_UT61D);
	250	}
	251
	252	static GSList *hw_dev_list_vc820(void)
	253	{
	254	return hw_dev_list(VOLTCRAFT_VC820);
	255	}
	256
79081ec8 UH	257	static int hw_dev_open(struct sr_dev_inst *sdi)
	258	{
	259	return open_usb(sdi);
	260	}
	261
	262	static int hw_dev_close(struct sr_dev_inst *sdi)
	263	{
	264	(void)sdi;
	265
	266	/* TODO */
	267
	268	return SR_OK;
	269	}
	270
	271	static int hw_cleanup(void)
	272	{
	273	clear_instances();
	274
	275	// libusb_exit(NULL);
	276
	277	return SR_OK;
	278	}
	279
	280	static int hw_info_get(int info_id, const void **data,
	281	const struct sr_dev_inst *sdi)
	282	{
	283	(void)sdi;
	284
	285	sr_spew("Backend requested info_id %d.", info_id);
	286
	287	switch (info_id) {
	288	case SR_DI_HWCAPS:
	289	*data = hwcaps;
	290	sr_spew("%s: Returning hwcaps.", __func__);
	291	break;
	292	case SR_DI_NUM_PROBES:
	293	*data = GINT_TO_POINTER(1);
	294	sr_spew("%s: Returning number of probes.", __func__);
	295	break;
	296	case SR_DI_PROBE_NAMES:
	297	*data = probe_names;
	298	sr_spew("%s: Returning probe names.", __func__);
	299	break;
	300	case SR_DI_SAMPLERATES:
	301	/* TODO: Get rid of this. */
	302	*data = NULL;
	303	sr_spew("%s: Returning samplerates.", __func__);
	304	return SR_ERR_ARG;
	305	break;
	306	case SR_DI_CUR_SAMPLERATE:
	307	/* TODO: Get rid of this. */
	308	*data = NULL;
	309	sr_spew("%s: Returning current samplerate.", __func__);
	310	return SR_ERR_ARG;
	311	break;
	312	default:
	313	sr_err("%s: Unknown info_id %d.", __func__, info_id);
	314	return SR_ERR_ARG;
	315	break;
	316	}
	317
	318	return SR_OK;
	319	}
	320
321	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
322	const void *value)
323	{
324	struct dev_context *devc;
325
326	devc = sdi->priv;
327
328	switch (hwcap) {
329	case SR_HWCAP_LIMIT_MSEC:
330	/* TODO: Not yet implemented. */
331	if ((const uint64_t )value == 0) {
332	sr_err("Time limit cannot be 0.");
333	return SR_ERR;
334	}
335	devc->limit_msec = (const uint64_t )value;
336	sr_dbg("Setting time limit to %" PRIu64 "ms.",
337	devc->limit_msec);
338	break;
339	case SR_HWCAP_LIMIT_SAMPLES:
340	if ((const uint64_t )value == 0) {
341	sr_err("Sample limit cannot be 0.");
342	return SR_ERR;
343	}
344	devc->limit_samples = (const uint64_t )value;
345	sr_dbg("Setting sample limit to %" PRIu64 ".",
346	devc->limit_samples);
347	break;
348	default:
349	sr_err("Unknown capability: %d.", hwcap);
350	return SR_ERR;
351	break;
352	}
353
354	return SR_OK;
355	}
356
357	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
fdbcb86d	358	int dmm, void *cb_data)
79081ec8 UH	359	{
	360	struct sr_datafeed_packet packet;
	361	struct sr_datafeed_header header;
	362	struct sr_datafeed_meta_analog meta;
	363	struct dev_context *devc;
	364
	365	devc = sdi->priv;
	366
	367	sr_dbg("Starting acquisition.");
	368
	369	devc->cb_data = cb_data;
	370
	371	/* Send header packet to the session bus. */
	372	sr_dbg("Sending SR_DF_HEADER.");
	373	packet.type = SR_DF_HEADER;
	374	packet.payload = (uint8_t *)&header;
	375	header.feed_version = 1;
	376	gettimeofday(&header.starttime, NULL);
	377	sr_session_send(devc->cb_data, &packet);
	378
	379	/* Send metadata about the SR_DF_ANALOG packets to come. */
	380	sr_dbg("Sending SR_DF_META_ANALOG.");
	381	packet.type = SR_DF_META_ANALOG;
	382	packet.payload = &meta;
	383	meta.num_probes = 1;
	384	sr_session_send(devc->cb_data, &packet);
	385
fdbcb86d UH	386	if (dmm == UNI_T_UT61D) {
	387	sr_source_add(0, 0, 10 /* poll_timeout */,
	388	uni_t_ut61d_receive_data, (void *)sdi);
	389	} else if (dmm == VOLTCRAFT_VC820) {
	390	sr_source_add(0, 0, 10 /* poll_timeout */,
	391	voltcraft_vc820_receive_data, (void *)sdi);
	392	}
79081ec8 UH	393
	394	return SR_OK;
	395	}
	396
fdbcb86d UH	397	static int hw_dev_acquisition_start_ut61d(const struct sr_dev_inst *sdi,
	398	void *cb_data)
	399	{
	400	return hw_dev_acquisition_start(sdi, UNI_T_UT61D, cb_data);
	401	}
	402
	403	static int hw_dev_acquisition_start_vc820(const struct sr_dev_inst *sdi,
	404	void *cb_data)
	405	{
	406	return hw_dev_acquisition_start(sdi, VOLTCRAFT_VC820, cb_data);
	407	}
	408
79081ec8 UH	409	static int hw_dev_acquisition_stop(const struct sr_dev_inst *sdi,
	410	void *cb_data)
	411	{
	412	struct sr_datafeed_packet packet;
	413
	414	(void)sdi;
	415
	416	sr_dbg("Stopping acquisition.");
	417
	418	/* Send end packet to the session bus. */
	419	sr_dbg("Sending SR_DF_END.");
	420	packet.type = SR_DF_END;
	421	sr_session_send(cb_data, &packet);
	422
	423	/* TODO? */
	424	sr_source_remove(0);
	425
	426	return SR_OK;
	427	}
	428
fdbcb86d UH	429	SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info = {
	430	.name = "uni-t-ut61d",
	431	.longname = "UNI-T UT61D",
	432	.api_version = 1,
	433	.init = hw_init_ut61d,
	434	.cleanup = hw_cleanup,
	435	.scan = hw_scan_ut61d,
	436	.dev_list = hw_dev_list_ut61d,
	437	.dev_clear = clear_instances,
	438	.dev_open = hw_dev_open,
	439	.dev_close = hw_dev_close,
	440	.info_get = hw_info_get,
	441	.dev_config_set = hw_dev_config_set,
	442	.dev_acquisition_start = hw_dev_acquisition_start_ut61d,
	443	.dev_acquisition_stop = hw_dev_acquisition_stop,
	444	.priv = NULL,
	445	};
	446
	447	SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info = {
	448	.name = "voltcraft-vc820",
	449	.longname = "Voltcraft VC-820",
79081ec8	450	.api_version = 1,
fdbcb86d	451	.init = hw_init_vc820,
79081ec8	452	.cleanup = hw_cleanup,
fdbcb86d UH	453	.scan = hw_scan_vc820,
fdbcb86d UH	454	.dev_list = hw_dev_list_vc820,
79081ec8 UH	455	.dev_clear = clear_instances,
	456	.dev_open = hw_dev_open,
	457	.dev_close = hw_dev_close,
	458	.info_get = hw_info_get,
	459	.dev_config_set = hw_dev_config_set,
fdbcb86d	460	.dev_acquisition_start = hw_dev_acquisition_start_vc820,
79081ec8 UH	461	.dev_acquisition_stop = hw_dev_acquisition_stop,
	462	.priv = NULL,
	463	};