[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 <config.h>
#include <string.h>
#include "protocol.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 const char *channel_names[] = {
	"T1", "T2", "T1-T2",
};

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

SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;

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

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

	drvc = di->context;
	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 = g_malloc0(sizeof(struct sr_dev_inst));
			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 < ARRAY_SIZE(channel_names); i++)
				sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE,
						channel_names[i]);
			devc = g_malloc0(sizeof(struct dev_context));
			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(const struct sr_dev_driver *di)
{
	return ((struct drv_context *)(di->context))->instances;
}

static int dev_open(struct sr_dev_inst *sdi)
{
	struct sr_dev_driver *di = sdi->driver;
	struct drv_context *drvc;
	struct sr_usb_dev_inst *usb;
	int ret;

	if (!(drvc = di->context)) {
		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 libusb 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_dev_driver *di = sdi->driver;
	struct sr_usb_dev_inst *usb;

	if (!di->context) {
		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(const struct sr_dev_driver *di)
{
	int ret;
	struct drv_context *drvc;

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

	ret = std_dev_clear(di, NULL);
	g_free(drvc);

	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 sr_dev_driver *di = sdi->driver;
	struct dev_context *devc;
	const char *tmp_str;

	(void)cg;

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

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

	devc = sdi->priv;

	switch (key) {
	case SR_CONF_LIMIT_SAMPLES:
		devc->limit_samples = g_variant_get_uint64(data);
		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:
		return SR_ERR_NA;
	}

	return SR_OK;
}

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 sr_dev_driver *di = sdi->driver;
	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->context;
	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;
	}

	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,
	.context = 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
6ec6c43b	20	#include <config.h>
6513f97f	21	#include <string.h>
515ab088	22	#include "protocol.h"
6513f97f	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
0f34cb47 UH	31	static const char *channel_names[] = {
0f34cb47 UH	32	"T1", "T2", "T1-T2",
6513f97f BV	33	};
	34
	35	static const char *data_sources[] = {
	36	"Live",
	37	"Memory",
	38	};
	39
3877dde4	40	SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;
3877dde4	41
4f840ce9	42	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
3877dde4 BV	43	{
	44	return std_init(sr_ctx, di, LOG_PREFIX);
	45	}
	46
4f840ce9	47	static GSList scan(struct sr_dev_driver di, GSList *options)
3877dde4 BV	48	{
3877dde4 BV	49	struct drv_context *drvc;
6513f97f BV	50	struct dev_context *devc;
6513f97f BV	51	struct sr_dev_inst *sdi;
6513f97f BV	52	struct sr_config *src;
6513f97f BV	53	GSList usb_devices, devices, *l;
07ffa5b3	54	unsigned int i;
6513f97f	55	const char *conn;
3877dde4	56
41812aca	57	drvc = di->context;
3877dde4 BV	58	drvc->instances = NULL;
3877dde4 BV	59
6513f97f BV	60	conn = NULL;
	61	for (l = options; l; l = l->next) {
	62	src = l->data;
	63	switch (src->key) {
	64	case SR_CONF_CONN:
	65	conn = g_variant_get_string(src->data, NULL);
	66	break;
	67	}
	68	}
	69	if (!conn)
	70	return NULL;
	71
	72	devices = NULL;
e196cb61	73	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
6513f97f BV	74	/* We have a list of sr_usb_dev_inst matching the connection
	75	* string. Wrap them in sr_dev_inst and we're done. */
	76	for (l = usb_devices; l; l = l->next) {
aac29cc1	77	sdi = g_malloc0(sizeof(struct sr_dev_inst));
0af636be UH	78	sdi->status = SR_ST_INACTIVE;
	79	sdi->vendor = g_strdup(VENDOR);
	80	sdi->model = g_strdup(MODEL);
6513f97f BV	81	sdi->driver = di;
	82	sdi->inst_type = SR_INST_USB;
	83	sdi->conn = l->data;
07ffa5b3	84	for (i = 0; i < ARRAY_SIZE(channel_names); i++)
0f34cb47 UH	85	sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE,
0f34cb47 UH	86	channel_names[i]);
f57d8ffe	87	devc = g_malloc0(sizeof(struct dev_context));
6513f97f BV	88	sdi->priv = devc;
	89	devc->limit_samples = 0;
	90	devc->data_source = DEFAULT_DATA_SOURCE;
	91	drvc->instances = g_slist_append(drvc->instances, sdi);
	92	devices = g_slist_append(devices, sdi);
	93	}
	94	g_slist_free(usb_devices);
	95	} else
	96	g_slist_free_full(usb_devices, g_free);
3877dde4 BV	97
	98	return devices;
	99	}
	100
4f840ce9	101	static GSList dev_list(const struct sr_dev_driver di)
3877dde4	102	{
41812aca	103	return ((struct drv_context *)(di->context))->instances;
3877dde4 BV	104	}
3877dde4 BV	105
3877dde4 BV	106	static int dev_open(struct sr_dev_inst *sdi)
3877dde4 BV	107	{
4f840ce9	108	struct sr_dev_driver *di = sdi->driver;
6513f97f BV	109	struct drv_context *drvc;
	110	struct sr_usb_dev_inst *usb;
	111	int ret;
	112
41812aca	113	if (!(drvc = di->context)) {
6513f97f BV	114	sr_err("Driver was not initialized.");
	115	return SR_ERR;
	116	}
	117
	118	usb = sdi->conn;
	119
	120	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	121	return SR_ERR;
	122
	123	/*
f3f19d11	124	* The libusb 1.0.9 Darwin backend is broken: it can report a kernel
6513f97f BV	125	* driver being active, but detaching it always returns an error.
	126	*/
	127	#if !defined(__APPLE__)
d6ff054a BV	128	if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
d6ff054a BV	129	if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
6513f97f BV	130	sr_err("failed to detach kernel driver: %s",
	131	libusb_error_name(ret));
	132	return SR_ERR;
	133	}
	134	}
	135	#endif
3877dde4	136
d6ff054a	137	if ((ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION))) {
6513f97f BV	138	sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
	139	return SR_ERR;
	140	}
3877dde4	141
6513f97f BV	142	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
	143	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	144	return SR_ERR;
	145	}
3877dde4 BV	146	sdi->status = SR_ST_ACTIVE;
3877dde4 BV	147
6513f97f	148	return ret;
3877dde4 BV	149	}
	150
	151	static int dev_close(struct sr_dev_inst *sdi)
	152	{
4f840ce9	153	struct sr_dev_driver *di = sdi->driver;
6513f97f	154	struct sr_usb_dev_inst *usb;
3877dde4	155
41812aca	156	if (!di->context) {
6513f97f BV	157	sr_err("Driver was not initialized.");
	158	return SR_ERR;
	159	}
	160
	161	usb = sdi->conn;
	162	if (!usb->devhdl)
	163	/* Nothing to do. */
	164	return SR_OK;
3877dde4	165
6513f97f BV	166	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	167	libusb_close(usb->devhdl);
	168	usb->devhdl = NULL;
3877dde4 BV	169	sdi->status = SR_ST_INACTIVE;
	170
	171	return SR_OK;
	172	}
	173
4f840ce9	174	static int cleanup(const struct sr_dev_driver *di)
3877dde4	175	{
6513f97f BV	176	int ret;
6513f97f BV	177	struct drv_context *drvc;
3877dde4	178
41812aca	179	if (!(drvc = di->context))
6513f97f BV	180	/* Can get called on an unused driver, doesn't matter. */
6513f97f BV	181	return SR_OK;
3877dde4	182
a6630742	183	ret = std_dev_clear(di, NULL);
6513f97f	184	g_free(drvc);
6513f97f BV	185
6513f97f BV	186	return ret;
3877dde4 BV	187	}
3877dde4 BV	188
584560f1	189	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	190	const struct sr_channel_group *cg)
3877dde4	191	{
6513f97f	192	struct dev_context *devc;
3877dde4	193
53b4680f	194	(void)cg;
d3c74a6f	195
6513f97f	196	devc = sdi->priv;
3877dde4	197	switch (key) {
6513f97f BV	198	case SR_CONF_LIMIT_SAMPLES:
	199	*data = g_variant_new_uint64(devc->limit_samples);
	200	break;
	201	case SR_CONF_DATA_SOURCE:
	202	if (devc->data_source == DATA_SOURCE_LIVE)
	203	*data = g_variant_new_string("Live");
	204	else
	205	*data = g_variant_new_string("Memory");
	206	break;
3877dde4 BV	207	default:
	208	return SR_ERR_NA;
	209	}
	210
6513f97f	211	return SR_OK;
3877dde4 BV	212	}
3877dde4 BV	213
584560f1	214	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	215	const struct sr_channel_group *cg)
3877dde4	216	{
4f840ce9	217	struct sr_dev_driver *di = sdi->driver;
6513f97f	218	struct dev_context *devc;
6513f97f	219	const char *tmp_str;
3877dde4	220
53b4680f	221	(void)cg;
d3c74a6f	222
3877dde4 BV	223	if (sdi->status != SR_ST_ACTIVE)
	224	return SR_ERR_DEV_CLOSED;
	225
41812aca	226	if (!di->context) {
6513f97f BV	227	sr_err("Driver was not initialized.");
	228	return SR_ERR;
	229	}
	230
	231	devc = sdi->priv;
dcd438ee	232
3877dde4	233	switch (key) {
6513f97f BV	234	case SR_CONF_LIMIT_SAMPLES:
6513f97f BV	235	devc->limit_samples = g_variant_get_uint64(data);
6513f97f BV	236	break;
	237	case SR_CONF_DATA_SOURCE:
	238	tmp_str = g_variant_get_string(data, NULL);
	239	if (!strcmp(tmp_str, "Live"))
	240	devc->data_source = DATA_SOURCE_LIVE;
	241	else if (!strcmp(tmp_str, "Memory"))
	242	devc->data_source = DATA_SOURCE_MEMORY;
	243	else
	244	return SR_ERR;
	245	break;
3877dde4	246	default:
dcd438ee	247	return SR_ERR_NA;
3877dde4 BV	248	}
3877dde4 BV	249
dcd438ee	250	return SR_OK;
3877dde4 BV	251	}
3877dde4 BV	252
584560f1	253	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	254	const struct sr_channel_group *cg)
3877dde4	255	{
3877dde4	256	(void)sdi;
53b4680f	257	(void)cg;
3877dde4	258
3877dde4	259	switch (key) {
6513f97f	260	case SR_CONF_DEVICE_OPTIONS:
584560f1	261	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
f254bc4b	262	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
6513f97f BV	263	break;
	264	case SR_CONF_DATA_SOURCE:
	265	*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
	266	break;
3877dde4 BV	267	default:
	268	return SR_ERR_NA;
	269	}
	270
6513f97f	271	return SR_OK;
3877dde4 BV	272	}
	273
	274	static int dev_acquisition_start(const struct sr_dev_inst *sdi,
	275	void *cb_data)
	276	{
4f840ce9	277	struct sr_dev_driver *di = sdi->driver;
6513f97f BV	278	struct drv_context *drvc;
	279	struct dev_context *devc;
	280	struct sr_usb_dev_inst *usb;
6c60facc	281	int len, ret;
6513f97f	282	unsigned char cmd[2];
3877dde4 BV	283
	284	if (sdi->status != SR_ST_ACTIVE)
	285	return SR_ERR_DEV_CLOSED;
	286
41812aca	287	drvc = di->context;
6513f97f BV	288	devc = sdi->priv;
	289	usb = sdi->conn;
	290
	291	devc->cb_data = cb_data;
	292	devc->num_samples = 0;
d6ff054a BV	293	devc->packet_len = 0;
	294
	295	/* Configure serial port parameters on USB-UART interface
	296	* chip inside the device (just baudrate 2400 actually). */
	297	cmd[0] = 0x09;
	298	cmd[1] = 0x60;
	299	ret = libusb_control_transfer(usb->devhdl, 0x21, 0x09, 0x0300, 0x00,
	300	cmd, 2, 5);
	301	if (ret != 2) {
	302	sr_dbg("Failed to configure CH9325: %s", libusb_error_name(ret));
	303	return SR_ERR;
	304	}
6513f97f	305
6513f97f BV	306	std_session_send_df_header(cb_data, LOG_PREFIX);
	307
	308	if (!(devc->xfer = libusb_alloc_transfer(0)))
	309	return SR_ERR;
	310
6513f97f BV	311	/* Length of payload to follow. */
	312	cmd[0] = 0x01;
	313	if (devc->data_source == DATA_SOURCE_LIVE)
	314	cmd[1] = CMD_GET_LIVE;
	315	else
	316	cmd[1] = CMD_GET_STORED;
	317
	318	ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, cmd, 2, &len, 5);
	319	if (ret != 0 \|\| len != 2) {
	320	sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
	321	libusb_free_transfer(devc->xfer);
	322	return SR_ERR;
	323	}
	324
	325	libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
d6ff054a	326	8, uni_t_ut32x_receive_transfer, (void *)sdi, 15);
6513f97f BV	327	if (libusb_submit_transfer(devc->xfer) != 0) {
	328	libusb_free_transfer(devc->xfer);
	329	return SR_ERR;
	330	}
3877dde4	331
102f1239 BV	332	usb_source_add(sdi->session, drvc->sr_ctx, 10,
102f1239 BV	333	uni_t_ut32x_handle_events, (void *)sdi);
d6ff054a	334
3877dde4 BV	335	return SR_OK;
	336	}
	337
	338	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	339	{
d6ff054a	340
3877dde4 BV	341	(void)cb_data;
	342
	343	if (sdi->status != SR_ST_ACTIVE)
	344	return SR_ERR_DEV_CLOSED;
	345
d6ff054a BV	346	/* Signal USB transfer handler to clean up and stop. */
d6ff054a BV	347	sdi->status = SR_ST_STOPPING;
3877dde4 BV	348
	349	return SR_OK;
	350	}
	351
	352	SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info = {
	353	.name = "uni-t-ut32x",
	354	.longname = "UNI-T UT32x",
	355	.api_version = 1,
	356	.init = init,
	357	.cleanup = cleanup,
	358	.scan = scan,
	359	.dev_list = dev_list,
a6630742	360	.dev_clear = NULL,
3877dde4 BV	361	.config_get = config_get,
	362	.config_set = config_set,
	363	.config_list = config_list,
	364	.dev_open = dev_open,
	365	.dev_close = dev_close,
	366	.dev_acquisition_start = dev_acquisition_start,
	367	.dev_acquisition_stop = dev_acquisition_stop,
41812aca	368	.context = NULL,
3877dde4	369	};