[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 <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;
	}

	/* 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,
	.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
6513f97f	20	#include <string.h>
515ab088	21	#include "protocol.h"
6513f97f	22
f254bc4b	23	static const uint32_t devopts[] = {
6513f97f	24	SR_CONF_THERMOMETER,
6513f97f	25	SR_CONF_CONTINUOUS,
5827f61b BV	26	SR_CONF_LIMIT_SAMPLES \| SR_CONF_GET \| SR_CONF_SET,
5827f61b BV	27	SR_CONF_DATA_SOURCE \| SR_CONF_GET \| SR_CONF_SET \| SR_CONF_LIST,
6513f97f BV	28	};
6513f97f BV	29
0f34cb47 UH	30	static const char *channel_names[] = {
0f34cb47 UH	31	"T1", "T2", "T1-T2",
6513f97f BV	32	};
	33
	34	static const char *data_sources[] = {
	35	"Live",
	36	"Memory",
	37	};
	38
3877dde4	39	SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info;
3877dde4	40
4f840ce9	41	static int init(struct sr_dev_driver di, struct sr_context sr_ctx)
3877dde4 BV	42	{
	43	return std_init(sr_ctx, di, LOG_PREFIX);
	44	}
	45
4f840ce9	46	static GSList scan(struct sr_dev_driver di, GSList *options)
3877dde4 BV	47	{
3877dde4 BV	48	struct drv_context *drvc;
6513f97f BV	49	struct dev_context *devc;
6513f97f BV	50	struct sr_dev_inst *sdi;
6513f97f BV	51	struct sr_config *src;
6513f97f BV	52	GSList usb_devices, devices, *l;
07ffa5b3	53	unsigned int i;
6513f97f	54	const char *conn;
3877dde4	55
41812aca	56	drvc = di->context;
3877dde4 BV	57	drvc->instances = NULL;
3877dde4 BV	58
6513f97f BV	59	conn = NULL;
	60	for (l = options; l; l = l->next) {
	61	src = l->data;
	62	switch (src->key) {
	63	case SR_CONF_CONN:
	64	conn = g_variant_get_string(src->data, NULL);
	65	break;
	66	}
	67	}
	68	if (!conn)
	69	return NULL;
	70
	71	devices = NULL;
e196cb61	72	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
6513f97f BV	73	/* We have a list of sr_usb_dev_inst matching the connection
	74	* string. Wrap them in sr_dev_inst and we're done. */
	75	for (l = usb_devices; l; l = l->next) {
aac29cc1	76	sdi = g_malloc0(sizeof(struct sr_dev_inst));
0af636be UH	77	sdi->status = SR_ST_INACTIVE;
	78	sdi->vendor = g_strdup(VENDOR);
	79	sdi->model = g_strdup(MODEL);
6513f97f BV	80	sdi->driver = di;
	81	sdi->inst_type = SR_INST_USB;
	82	sdi->conn = l->data;
07ffa5b3	83	for (i = 0; i < ARRAY_SIZE(channel_names); i++)
0f34cb47 UH	84	sr_channel_new(sdi, i, SR_CHANNEL_ANALOG, TRUE,
0f34cb47 UH	85	channel_names[i]);
f57d8ffe	86	devc = g_malloc0(sizeof(struct dev_context));
6513f97f BV	87	sdi->priv = devc;
	88	devc->limit_samples = 0;
	89	devc->data_source = DEFAULT_DATA_SOURCE;
	90	drvc->instances = g_slist_append(drvc->instances, sdi);
	91	devices = g_slist_append(devices, sdi);
	92	}
	93	g_slist_free(usb_devices);
	94	} else
	95	g_slist_free_full(usb_devices, g_free);
3877dde4 BV	96
	97	return devices;
	98	}
	99
4f840ce9	100	static GSList dev_list(const struct sr_dev_driver di)
3877dde4	101	{
41812aca	102	return ((struct drv_context *)(di->context))->instances;
3877dde4 BV	103	}
3877dde4 BV	104
3877dde4 BV	105	static int dev_open(struct sr_dev_inst *sdi)
3877dde4 BV	106	{
4f840ce9	107	struct sr_dev_driver *di = sdi->driver;
6513f97f BV	108	struct drv_context *drvc;
	109	struct sr_usb_dev_inst *usb;
	110	int ret;
	111
41812aca	112	if (!(drvc = di->context)) {
6513f97f BV	113	sr_err("Driver was not initialized.");
	114	return SR_ERR;
	115	}
	116
	117	usb = sdi->conn;
	118
	119	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	120	return SR_ERR;
	121
	122	/*
f3f19d11	123	* The libusb 1.0.9 Darwin backend is broken: it can report a kernel
6513f97f BV	124	* driver being active, but detaching it always returns an error.
	125	*/
	126	#if !defined(__APPLE__)
d6ff054a BV	127	if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
d6ff054a BV	128	if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
6513f97f BV	129	sr_err("failed to detach kernel driver: %s",
	130	libusb_error_name(ret));
	131	return SR_ERR;
	132	}
	133	}
	134	#endif
3877dde4	135
d6ff054a	136	if ((ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION))) {
6513f97f BV	137	sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
	138	return SR_ERR;
	139	}
3877dde4	140
6513f97f BV	141	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
	142	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	143	return SR_ERR;
	144	}
3877dde4 BV	145	sdi->status = SR_ST_ACTIVE;
3877dde4 BV	146
6513f97f	147	return ret;
3877dde4 BV	148	}
	149
	150	static int dev_close(struct sr_dev_inst *sdi)
	151	{
4f840ce9	152	struct sr_dev_driver *di = sdi->driver;
6513f97f	153	struct sr_usb_dev_inst *usb;
3877dde4	154
41812aca	155	if (!di->context) {
6513f97f BV	156	sr_err("Driver was not initialized.");
	157	return SR_ERR;
	158	}
	159
	160	usb = sdi->conn;
	161	if (!usb->devhdl)
	162	/* Nothing to do. */
	163	return SR_OK;
3877dde4	164
6513f97f BV	165	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	166	libusb_close(usb->devhdl);
	167	usb->devhdl = NULL;
3877dde4 BV	168	sdi->status = SR_ST_INACTIVE;
	169
	170	return SR_OK;
	171	}
	172
4f840ce9	173	static int cleanup(const struct sr_dev_driver *di)
3877dde4	174	{
6513f97f BV	175	int ret;
6513f97f BV	176	struct drv_context *drvc;
3877dde4	177
41812aca	178	if (!(drvc = di->context))
6513f97f BV	179	/* Can get called on an unused driver, doesn't matter. */
6513f97f BV	180	return SR_OK;
3877dde4	181
a6630742	182	ret = std_dev_clear(di, NULL);
6513f97f	183	g_free(drvc);
6513f97f BV	184
6513f97f BV	185	return ret;
3877dde4 BV	186	}
3877dde4 BV	187
584560f1	188	static int config_get(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	189	const struct sr_channel_group *cg)
3877dde4	190	{
6513f97f	191	struct dev_context *devc;
3877dde4	192
53b4680f	193	(void)cg;
d3c74a6f	194
6513f97f	195	devc = sdi->priv;
3877dde4	196	switch (key) {
6513f97f BV	197	case SR_CONF_LIMIT_SAMPLES:
	198	*data = g_variant_new_uint64(devc->limit_samples);
	199	break;
	200	case SR_CONF_DATA_SOURCE:
	201	if (devc->data_source == DATA_SOURCE_LIVE)
	202	*data = g_variant_new_string("Live");
	203	else
	204	*data = g_variant_new_string("Memory");
	205	break;
3877dde4 BV	206	default:
	207	return SR_ERR_NA;
	208	}
	209
6513f97f	210	return SR_OK;
3877dde4 BV	211	}
3877dde4 BV	212
584560f1	213	static int config_set(uint32_t key, GVariant data, const struct sr_dev_inst sdi,
53b4680f	214	const struct sr_channel_group *cg)
3877dde4	215	{
4f840ce9	216	struct sr_dev_driver *di = sdi->driver;
6513f97f	217	struct dev_context *devc;
6513f97f	218	const char *tmp_str;
3877dde4	219
53b4680f	220	(void)cg;
d3c74a6f	221
3877dde4 BV	222	if (sdi->status != SR_ST_ACTIVE)
	223	return SR_ERR_DEV_CLOSED;
	224
41812aca	225	if (!di->context) {
6513f97f BV	226	sr_err("Driver was not initialized.");
	227	return SR_ERR;
	228	}
	229
	230	devc = sdi->priv;
dcd438ee	231
3877dde4	232	switch (key) {
6513f97f BV	233	case SR_CONF_LIMIT_SAMPLES:
6513f97f BV	234	devc->limit_samples = g_variant_get_uint64(data);
6513f97f BV	235	break;
	236	case SR_CONF_DATA_SOURCE:
	237	tmp_str = g_variant_get_string(data, NULL);
	238	if (!strcmp(tmp_str, "Live"))
	239	devc->data_source = DATA_SOURCE_LIVE;
	240	else if (!strcmp(tmp_str, "Memory"))
	241	devc->data_source = DATA_SOURCE_MEMORY;
	242	else
	243	return SR_ERR;
	244	break;
3877dde4	245	default:
dcd438ee	246	return SR_ERR_NA;
3877dde4 BV	247	}
3877dde4 BV	248
dcd438ee	249	return SR_OK;
3877dde4 BV	250	}
3877dde4 BV	251
584560f1	252	static int config_list(uint32_t key, GVariant *data, const struct sr_dev_inst sdi,
53b4680f	253	const struct sr_channel_group *cg)
3877dde4	254	{
3877dde4	255	(void)sdi;
53b4680f	256	(void)cg;
3877dde4	257
3877dde4	258	switch (key) {
6513f97f	259	case SR_CONF_DEVICE_OPTIONS:
584560f1	260	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
f254bc4b	261	devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
6513f97f BV	262	break;
	263	case SR_CONF_DATA_SOURCE:
	264	*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
	265	break;
3877dde4 BV	266	default:
	267	return SR_ERR_NA;
	268	}
	269
6513f97f	270	return SR_OK;
3877dde4 BV	271	}
	272
	273	static int dev_acquisition_start(const struct sr_dev_inst *sdi,
	274	void *cb_data)
	275	{
4f840ce9	276	struct sr_dev_driver *di = sdi->driver;
6513f97f BV	277	struct drv_context *drvc;
	278	struct dev_context *devc;
	279	struct sr_usb_dev_inst *usb;
6c60facc	280	int len, ret;
6513f97f	281	unsigned char cmd[2];
3877dde4 BV	282
	283	if (sdi->status != SR_ST_ACTIVE)
	284	return SR_ERR_DEV_CLOSED;
	285
41812aca	286	drvc = di->context;
6513f97f BV	287	devc = sdi->priv;
	288	usb = sdi->conn;
	289
	290	devc->cb_data = cb_data;
	291	devc->num_samples = 0;
d6ff054a BV	292	devc->packet_len = 0;
	293
	294	/* Configure serial port parameters on USB-UART interface
	295	* chip inside the device (just baudrate 2400 actually). */
	296	cmd[0] = 0x09;
	297	cmd[1] = 0x60;
	298	ret = libusb_control_transfer(usb->devhdl, 0x21, 0x09, 0x0300, 0x00,
	299	cmd, 2, 5);
	300	if (ret != 2) {
	301	sr_dbg("Failed to configure CH9325: %s", libusb_error_name(ret));
	302	return SR_ERR;
	303	}
6513f97f BV	304
	305	/* Send header packet to the session bus. */
	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	};