[libsigrok.git] / src / hardware / uni-t-ut32x / api.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.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 "protocol.h"

#include <string.h>

static const uint32_t devopts[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_CONTINUOUS,
	SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
	SR_CONF_DATA_SOURCE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
};

static char *channels[] = {
	"T1",
	"T2",
	"T1-T2",
};

static const char *data_sources[] = {
	"Live",
	"Memory",
};

SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;
static struct sr_dev_driver *di = &uni_t_ut32x_driver_info;


static int init(struct sr_context *sr_ctx)
{
	return std_init(sr_ctx, di, LOG_PREFIX);
}

static GSList *scan(GSList *options)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_dev_inst *sdi;
	struct sr_channel *ch;
	struct sr_config *src;
	GSList *usb_devices, *devices, *l;
	int i;
	const char *conn;

	drvc = di->priv;
	drvc->instances = NULL;

	conn = NULL;
	for (l = options; l; l = l->next) {
		src = l->data;
		switch (src->key) {
		case SR_CONF_CONN:
			conn = g_variant_get_string(src->data, NULL);
			break;
		}
	}
	if (!conn)
		return NULL;

	devices = NULL;
	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
		/* We have a list of sr_usb_dev_inst matching the connection
		 * string. Wrap them in sr_dev_inst and we're done. */
		for (l = usb_devices; l; l = l->next) {
			sdi = sr_dev_inst_new();
			sdi->status = SR_ST_INACTIVE;
			sdi->vendor = g_strdup(VENDOR);
			sdi->model = g_strdup(MODEL);
			sdi->driver = di;
			sdi->inst_type = SR_INST_USB;
			sdi->conn = l->data;
			for (i = 0; i < 3; i++) {
				if (!(ch = sr_channel_new(i, SR_CHANNEL_ANALOG, TRUE,
						channels[i]))) {
					sr_dbg("Channel malloc failed.");
					return NULL;
				}
				sdi->channels = g_slist_append(sdi->channels, ch);
			}

			if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
				sr_dbg("Device context malloc failed.");
				return NULL;
			}
			sdi->priv = devc;
			devc->limit_samples = 0;
			devc->data_source = DEFAULT_DATA_SOURCE;
			drvc->instances = g_slist_append(drvc->instances, sdi);
			devices = g_slist_append(devices, sdi);
		}
		g_slist_free(usb_devices);
	} else
		g_slist_free_full(usb_devices, g_free);

	return devices;
}

static GSList *dev_list(void)
{
	return ((struct drv_context *)(di->priv))->instances;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	int ret;

	if (!(drvc = di->priv)) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	usb = sdi->conn;

	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
		return SR_ERR;

/*
 * The libusbx 1.0.9 darwin backend is broken: it can report a kernel
 * driver being active, but detaching it always returns an error.
 */
#if !defined(__APPLE__)
	if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
		if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
			sr_err("failed to detach kernel driver: %s",
					libusb_error_name(ret));
			return SR_ERR;
		}
	}
#endif

	if ((ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION))) {
		sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
		sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
		return SR_ERR;
	}
	sdi->status = SR_ST_ACTIVE;

	return ret;
}

static int dev_close(struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;

	if (!di->priv) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	usb = sdi->conn;
	if (!usb->devhdl)
		/*  Nothing to do. */
		return SR_OK;

	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	libusb_close(usb->devhdl);
	usb->devhdl = NULL;
	sdi->status = SR_ST_INACTIVE;

	return SR_OK;
}

static int cleanup(void)
{
	int ret;
	struct drv_context *drvc;

	if (!(drvc = di->priv))
		/* Can get called on an unused driver, doesn't matter. */
		return SR_OK;


	ret = std_dev_clear(di, NULL);
	g_free(drvc);
	di->priv = NULL;

	return ret;
}

static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;

	(void)cg;

	devc = sdi->priv;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		*data = g_variant_new_uint64(devc->limit_samples);
		break;
	case SR_CONF_DATA_SOURCE:
		if (devc->data_source == DATA_SOURCE_LIVE)
			*data = g_variant_new_string("Live");
		else
			*data = g_variant_new_string("Memory");
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{
	struct dev_context *devc;
	int ret;
	const char *tmp_str;

	(void)cg;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	if (!di->priv) {
		sr_err("Driver was not initialized.");
		return SR_ERR;
	}

	devc = sdi->priv;
	ret = SR_OK;
	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		sr_dbg("Setting sample limit to %" PRIu64 ".",
		       devc->limit_samples);
		break;
	case SR_CONF_DATA_SOURCE:
		tmp_str = g_variant_get_string(data, NULL);
		if (!strcmp(tmp_str, "Live"))
			devc->data_source = DATA_SOURCE_LIVE;
		else if (!strcmp(tmp_str, "Memory"))
			devc->data_source = DATA_SOURCE_MEMORY;
		else
			return SR_ERR;
		break;
	default:
		ret = SR_ERR_NA;
	}

	return ret;
}

static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
		const struct sr_channel_group *cg)
{

	(void)sdi;
	(void)cg;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
				devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
		break;
	case SR_CONF_DATA_SOURCE:
		*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
		break;
	default:
		return SR_ERR_NA;
	}

	return SR_OK;
}

static int dev_acquisition_start(const struct sr_dev_inst *sdi,
				    void *cb_data)
{
	struct drv_context *drvc;
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	int len, ret;
	unsigned char cmd[2];

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	drvc = di->priv;
	devc = sdi->priv;
	usb = sdi->conn;

	devc->cb_data = cb_data;
	devc->num_samples = 0;
	devc->packet_len = 0;

	/* Configure serial port parameters on USB-UART interface
	 * chip inside the device (just baudrate 2400 actually). */
	cmd[0] = 0x09;
	cmd[1] = 0x60;
	ret = libusb_control_transfer(usb->devhdl, 0x21, 0x09, 0x0300, 0x00,
			cmd, 2, 5);
	if (ret != 2) {
		sr_dbg("Failed to configure CH9325: %s", libusb_error_name(ret));
		return SR_ERR;
	}

	/* Send header packet to the session bus. */
	std_session_send_df_header(cb_data, LOG_PREFIX);

	if (!(devc->xfer = libusb_alloc_transfer(0)))
		return SR_ERR;

	/* Length of payload to follow. */
	cmd[0] = 0x01;
	if (devc->data_source == DATA_SOURCE_LIVE)
		cmd[1] = CMD_GET_LIVE;
	else
		cmd[1] = CMD_GET_STORED;

	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
	if (ret != 0 || len != 2) {
		sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
		libusb_free_transfer(devc->xfer);
		return SR_ERR;
	}

	libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
			8, uni_t_ut32x_receive_transfer, (void *)sdi, 15);
	if (libusb_submit_transfer(devc->xfer) != 0) {
		libusb_free_transfer(devc->xfer);
		return SR_ERR;
	}

	usb_source_add(sdi->session, drvc->sr_ctx, 10,
			uni_t_ut32x_handle_events, (void *)sdi);

	return SR_OK;
}

static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{

	(void)cb_data;

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR_DEV_CLOSED;

	/* Signal USB transfer handler to clean up and stop. */
	sdi->status = SR_ST_STOPPING;

	return SR_OK;
}

SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info = {
	.name = "uni-t-ut32x",
	.longname = "UNI-T UT32x",
	.api_version = 1,
	.init = init,
	.cleanup = cleanup,
	.scan = scan,
	.dev_list = dev_list,
	.dev_clear = NULL,
	.config_get = config_get,
	.config_set = config_set,
	.config_list = config_list,
	.dev_open = dev_open,
	.dev_close = dev_close,
	.dev_acquisition_start = dev_acquisition_start,
	.dev_acquisition_stop = dev_acquisition_stop,
	.priv = NULL,
};
Commit	Line	Data
3877dde4 BV	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
	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 3 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, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include "protocol.h"
	21
6513f97f BV	22	#include <string.h>
6513f97f BV	23
f254bc4b	24	static const uint32_t devopts[] = {
6513f97f	25	SR_CONF_THERMOMETER,
6513f97f	26	SR_CONF_CONTINUOUS,
5827f61b BV	27	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
5827f61b BV	28	SR_CONF_DATA_SOURCE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
6513f97f BV	29	};
6513f97f BV	30
ba7dd8bb	31	static char *channels[] = {
6513f97f BV	32	"T1",
	33	"T2",
	34	"T1-T2",
	35	};
	36
	37	static const char *data_sources[] = {
	38	"Live",
	39	"Memory",
	40	};
	41
3877dde4 BV	42	SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;
	43	static struct sr_dev_driver *di = &uni_t_ut32x_driver_info;
	44
	45
	46	static int init(struct sr_context *sr_ctx)
	47	{
	48	return std_init(sr_ctx, di, LOG_PREFIX);
	49	}
	50
	51	static GSList scan(GSList options)
	52	{
	53	struct drv_context *drvc;
6513f97f BV	54	struct dev_context *devc;
6513f97f BV	55	struct sr_dev_inst *sdi;
ba7dd8bb	56	struct sr_channel *ch;
6513f97f BV	57	struct sr_config *src;
	58	GSList usb_devices, devices, *l;
	59	int i;
	60	const char *conn;
3877dde4	61
3877dde4 BV	62	drvc = di->priv;
	63	drvc->instances = NULL;
	64
6513f97f BV	65	conn = NULL;
	66	for (l = options; l; l = l->next) {
	67	src = l->data;
	68	switch (src->key) {
	69	case SR_CONF_CONN:
	70	conn = g_variant_get_string(src->data, NULL);
	71	break;
	72	}
	73	}
	74	if (!conn)
	75	return NULL;
	76
	77	devices = NULL;
e196cb61	78	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
6513f97f BV	79	/* We have a list of sr_usb_dev_inst matching the connection
	80	* string. Wrap them in sr_dev_inst and we're done. */
	81	for (l = usb_devices; l; l = l->next) {
0af636be UH	82	sdi = sr_dev_inst_new();
	83	sdi->status = SR_ST_INACTIVE;
	84	sdi->vendor = g_strdup(VENDOR);
	85	sdi->model = g_strdup(MODEL);
6513f97f BV	86	sdi->driver = di;
	87	sdi->inst_type = SR_INST_USB;
	88	sdi->conn = l->data;
	89	for (i = 0; i < 3; i++) {
3f239f08	90	if (!(ch = sr_channel_new(i, SR_CHANNEL_ANALOG, TRUE,
ba7dd8bb UH	91	channels[i]))) {
ba7dd8bb UH	92	sr_dbg("Channel malloc failed.");
6513f97f BV	93	return NULL;
6513f97f BV	94	}
ba7dd8bb	95	sdi->channels = g_slist_append(sdi->channels, ch);
6513f97f BV	96	}
	97
	98	if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
	99	sr_dbg("Device context malloc failed.");
	100	return NULL;
	101	}
	102	sdi->priv = devc;
	103	devc->limit_samples = 0;
	104	devc->data_source = DEFAULT_DATA_SOURCE;
	105	drvc->instances = g_slist_append(drvc->instances, sdi);
	106	devices = g_slist_append(devices, sdi);
	107	}
	108	g_slist_free(usb_devices);
	109	} else
	110	g_slist_free_full(usb_devices, g_free);
3877dde4 BV	111
	112	return devices;
	113	}
	114
	115	static GSList *dev_list(void)
	116	{
45c0841b	117	return ((struct drv_context *)(di->priv))->instances;
3877dde4 BV	118	}
3877dde4 BV	119
3877dde4 BV	120	static int dev_open(struct sr_dev_inst *sdi)
3877dde4 BV	121	{
6513f97f BV	122	struct drv_context *drvc;
	123	struct sr_usb_dev_inst *usb;
	124	int ret;
	125
	126	if (!(drvc = di->priv)) {
	127	sr_err("Driver was not initialized.");
	128	return SR_ERR;
	129	}
	130
	131	usb = sdi->conn;
	132
	133	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	134	return SR_ERR;
	135
	136	/*
	137	* The libusbx 1.0.9 darwin backend is broken: it can report a kernel
	138	* driver being active, but detaching it always returns an error.
	139	*/
	140	#if !defined(__APPLE__)
d6ff054a BV	141	if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
d6ff054a BV	142	if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
6513f97f BV	143	sr_err("failed to detach kernel driver: %s",
	144	libusb_error_name(ret));
	145	return SR_ERR;
	146	}
	147	}
	148	#endif
3877dde4	149
d6ff054a	150	if ((ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION))) {
6513f97f BV	151	sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
	152	return SR_ERR;
	153	}
3877dde4	154
6513f97f BV	155	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
	156	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	157	return SR_ERR;
	158	}
3877dde4 BV	159	sdi->status = SR_ST_ACTIVE;
3877dde4 BV	160
6513f97f	161	return ret;
3877dde4 BV	162	}
	163
	164	static int dev_close(struct sr_dev_inst *sdi)
	165	{
6513f97f	166	struct sr_usb_dev_inst *usb;
3877dde4	167
6513f97f BV	168	if (!di->priv) {
	169	sr_err("Driver was not initialized.");
	170	return SR_ERR;
	171	}
	172
	173	usb = sdi->conn;
	174	if (!usb->devhdl)
	175	/* Nothing to do. */
	176	return SR_OK;
3877dde4	177
6513f97f BV	178	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	179	libusb_close(usb->devhdl);
	180	usb->devhdl = NULL;
3877dde4 BV	181	sdi->status = SR_ST_INACTIVE;
	182
	183	return SR_OK;
	184	}
	185
	186	static int cleanup(void)
	187	{
6513f97f BV	188	int ret;
6513f97f BV	189	struct drv_context *drvc;
3877dde4	190
6513f97f BV	191	if (!(drvc = di->priv))
	192	/* Can get called on an unused driver, doesn't matter. */
	193	return SR_OK;
3877dde4	194
a6630742 BV	195
a6630742 BV	196	ret = std_dev_clear(di, NULL);
6513f97f BV	197	g_free(drvc);
	198	di->priv = NULL;
	199
	200	return ret;
3877dde4 BV	201	}
3877dde4 BV	202
584560f1	203	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	204	const struct sr_channel_group *cg)
3877dde4	205	{
6513f97f	206	struct dev_context *devc;
3877dde4	207
53b4680f	208	(void)cg;
d3c74a6f	209
6513f97f	210	devc = sdi->priv;
3877dde4	211	switch (key) {
6513f97f BV	212	case SR_CONF_LIMIT_SAMPLES:
	213	*data = g_variant_new_uint64(devc->limit_samples);
	214	break;
	215	case SR_CONF_DATA_SOURCE:
	216	if (devc->data_source == DATA_SOURCE_LIVE)
	217	*data = g_variant_new_string("Live");
	218	else
	219	*data = g_variant_new_string("Memory");
	220	break;
3877dde4 BV	221	default:
	222	return SR_ERR_NA;
	223	}
	224
6513f97f	225	return SR_OK;
3877dde4 BV	226	}
3877dde4 BV	227
584560f1	228	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	229	const struct sr_channel_group *cg)
3877dde4	230	{
6513f97f	231	struct dev_context *devc;
3877dde4	232	int ret;
6513f97f	233	const char *tmp_str;
3877dde4	234
53b4680f	235	(void)cg;
d3c74a6f	236
3877dde4 BV	237	if (sdi->status != SR_ST_ACTIVE)
	238	return SR_ERR_DEV_CLOSED;
	239
6513f97f BV	240	if (!di->priv) {
	241	sr_err("Driver was not initialized.");
	242	return SR_ERR;
	243	}
	244
	245	devc = sdi->priv;
3877dde4 BV	246	ret = SR_OK;
3877dde4 BV	247	switch (key) {
6513f97f BV	248	case SR_CONF_LIMIT_SAMPLES:
	249	devc->limit_samples = g_variant_get_uint64(data);
	250	sr_dbg("Setting sample limit to %" PRIu64 ".",
	251	devc->limit_samples);
	252	break;
	253	case SR_CONF_DATA_SOURCE:
	254	tmp_str = g_variant_get_string(data, NULL);
	255	if (!strcmp(tmp_str, "Live"))
	256	devc->data_source = DATA_SOURCE_LIVE;
	257	else if (!strcmp(tmp_str, "Memory"))
	258	devc->data_source = DATA_SOURCE_MEMORY;
	259	else
	260	return SR_ERR;
	261	break;
3877dde4 BV	262	default:
	263	ret = SR_ERR_NA;
	264	}
	265
	266	return ret;
	267	}
	268
584560f1	269	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	270	const struct sr_channel_group *cg)
3877dde4	271	{
3877dde4 BV	272
3877dde4 BV	273	(void)sdi;
53b4680f	274	(void)cg;
3877dde4	275
3877dde4	276	switch (key) {
6513f97f	277	case SR_CONF_DEVICE_OPTIONS:
584560f1	278	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
f254bc4b	279	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
6513f97f BV	280	break;
	281	case SR_CONF_DATA_SOURCE:
	282	*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
	283	break;
3877dde4 BV	284	default:
	285	return SR_ERR_NA;
	286	}
	287
6513f97f	288	return SR_OK;
3877dde4 BV	289	}
	290
	291	static int dev_acquisition_start(const struct sr_dev_inst *sdi,
	292	void *cb_data)
	293	{
6513f97f BV	294	struct drv_context *drvc;
	295	struct dev_context *devc;
	296	struct sr_usb_dev_inst *usb;
6c60facc	297	int len, ret;
6513f97f	298	unsigned char cmd[2];
3877dde4 BV	299
	300	if (sdi->status != SR_ST_ACTIVE)
	301	return SR_ERR_DEV_CLOSED;
	302
6513f97f BV	303	drvc = di->priv;
	304	devc = sdi->priv;
	305	usb = sdi->conn;
	306
	307	devc->cb_data = cb_data;
	308	devc->num_samples = 0;
d6ff054a BV	309	devc->packet_len = 0;
	310
	311	/* Configure serial port parameters on USB-UART interface
	312	* chip inside the device (just baudrate 2400 actually). */
	313	cmd[0] = 0x09;
	314	cmd[1] = 0x60;
	315	ret = libusb_control_transfer(usb->devhdl, 0x21, 0x09, 0x0300, 0x00,
	316	cmd, 2, 5);
	317	if (ret != 2) {
	318	sr_dbg("Failed to configure CH9325: %s", libusb_error_name(ret));
	319	return SR_ERR;
	320	}
6513f97f BV	321
	322	/* Send header packet to the session bus. */
	323	std_session_send_df_header(cb_data, LOG_PREFIX);
	324
	325	if (!(devc->xfer = libusb_alloc_transfer(0)))
	326	return SR_ERR;
	327
6513f97f BV	328	/* Length of payload to follow. */
	329	cmd[0] = 0x01;
	330	if (devc->data_source == DATA_SOURCE_LIVE)
	331	cmd[1] = CMD_GET_LIVE;
	332	else
	333	cmd[1] = CMD_GET_STORED;
	334
	335	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
	336	if (ret != 0 \|\| len != 2) {
	337	sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
	338	libusb_free_transfer(devc->xfer);
	339	return SR_ERR;
	340	}
	341
	342	libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
d6ff054a	343	8, uni_t_ut32x_receive_transfer, (void *)sdi, 15);
6513f97f BV	344	if (libusb_submit_transfer(devc->xfer) != 0) {
	345	libusb_free_transfer(devc->xfer);
	346	return SR_ERR;
	347	}
3877dde4	348
102f1239 BV	349	usb_source_add(sdi->session, drvc->sr_ctx, 10,
102f1239 BV	350	uni_t_ut32x_handle_events, (void *)sdi);
d6ff054a	351
3877dde4 BV	352	return SR_OK;
	353	}
	354
	355	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	356	{
d6ff054a	357
3877dde4 BV	358	(void)cb_data;
	359
	360	if (sdi->status != SR_ST_ACTIVE)
	361	return SR_ERR_DEV_CLOSED;
	362
d6ff054a BV	363	/* Signal USB transfer handler to clean up and stop. */
d6ff054a BV	364	sdi->status = SR_ST_STOPPING;
3877dde4 BV	365
	366	return SR_OK;
	367	}
	368
	369	SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info = {
	370	.name = "uni-t-ut32x",
	371	.longname = "UNI-T UT32x",
	372	.api_version = 1,
	373	.init = init,
	374	.cleanup = cleanup,
	375	.scan = scan,
	376	.dev_list = dev_list,
a6630742	377	.dev_clear = NULL,
3877dde4 BV	378	.config_get = config_get,
	379	.config_set = config_set,
	380	.config_list = config_list,
	381	.dev_open = dev_open,
	382	.dev_close = dev_close,
	383	.dev_acquisition_start = dev_acquisition_start,
	384	.dev_acquisition_stop = dev_acquisition_stop,
	385	.priv = NULL,
	386	};