[libsigrok.git] / 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 int32_t hwcaps[] = {
	SR_CONF_THERMOMETER,
	SR_CONF_LIMIT_SAMPLES,
	SR_CONF_CONTINUOUS,
	SR_CONF_DATA_SOURCE,
};

static char *probes[] = {
	"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_probe *probe;
	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, USB_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) {
			if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR,
					MODEL, NULL)))
				return NULL;
			sdi->driver = di;
			sdi->inst_type = SR_INST_USB;
			sdi->conn = l->data;
			for (i = 0; i < 3; i++) {
				if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
						probes[i]))) {
					sr_dbg("Probe malloc failed.");
					return NULL;
				}
				sdi->probes = g_slist_append(sdi->probes, probe);
			}

			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)
{
	struct drv_context *drvc;

	drvc = di->priv;

	return drvc->instances;
}

static int dev_clear(void)
{
	return std_dev_clear(di, NULL);
}

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 = dev_clear();
	g_free(drvc);
	di->priv = NULL;

	return ret;
}

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

	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(int key, GVariant *data, const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	int ret;
	const char *tmp_str;

	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(int key, GVariant **data, const struct sr_dev_inst *sdi)
{

	(void)sdi;

	switch (key) {
	case SR_CONF_DEVICE_OPTIONS:
		*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
				hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_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;
	const struct libusb_pollfd **pfd;
	int len, ret, i;
	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;
	}

	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	for (i = 0; pfd[i]; i++) {
		/* Handle USB events every 10ms. */
		sr_source_add(pfd[i]->fd, pfd[i]->events, 10,
				uni_t_ut32x_handle_events, (void *)sdi);
		/* We'll need to remove this fd later. */
		devc->usbfd[i] = pfd[i]->fd;
	}
	devc->usbfd[i] = -1;

	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 = dev_clear,
	.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
6513f97f BV	24	static const int32_t hwcaps[] = {
	25	SR_CONF_THERMOMETER,
	26	SR_CONF_LIMIT_SAMPLES,
	27	SR_CONF_CONTINUOUS,
	28	SR_CONF_DATA_SOURCE,
	29	};
	30
	31	static char *probes[] = {
	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;
	55	struct sr_dev_inst *sdi;
	56	struct sr_probe *probe;
	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;
	78	if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, USB_CONN))) {
	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) {
	82	if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, VENDOR,
	83	MODEL, NULL)))
	84	return NULL;
	85	sdi->driver = di;
	86	sdi->inst_type = SR_INST_USB;
	87	sdi->conn = l->data;
	88	for (i = 0; i < 3; i++) {
	89	if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
	90	probes[i]))) {
	91	sr_dbg("Probe malloc failed.");
	92	return NULL;
	93	}
	94	sdi->probes = g_slist_append(sdi->probes, probe);
	95	}
	96
	97	if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
	98	sr_dbg("Device context malloc failed.");
	99	return NULL;
	100	}
	101	sdi->priv = devc;
	102	devc->limit_samples = 0;
	103	devc->data_source = DEFAULT_DATA_SOURCE;
	104	drvc->instances = g_slist_append(drvc->instances, sdi);
	105	devices = g_slist_append(devices, sdi);
	106	}
	107	g_slist_free(usb_devices);
	108	} else
	109	g_slist_free_full(usb_devices, g_free);
3877dde4 BV	110
	111	return devices;
	112	}
	113
	114	static GSList *dev_list(void)
	115	{
	116	struct drv_context *drvc;
	117
	118	drvc = di->priv;
	119
	120	return drvc->instances;
	121	}
	122
	123	static int dev_clear(void)
	124	{
	125	return std_dev_clear(di, NULL);
	126	}
	127
	128	static int dev_open(struct sr_dev_inst *sdi)
	129	{
6513f97f BV	130	struct drv_context *drvc;
	131	struct sr_usb_dev_inst *usb;
	132	int ret;
	133
	134	if (!(drvc = di->priv)) {
	135	sr_err("Driver was not initialized.");
	136	return SR_ERR;
	137	}
	138
	139	usb = sdi->conn;
	140
	141	if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
	142	return SR_ERR;
	143
	144	/*
	145	* The libusbx 1.0.9 darwin backend is broken: it can report a kernel
	146	* driver being active, but detaching it always returns an error.
	147	*/
	148	#if !defined(__APPLE__)
d6ff054a BV	149	if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
d6ff054a BV	150	if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
6513f97f BV	151	sr_err("failed to detach kernel driver: %s",
	152	libusb_error_name(ret));
	153	return SR_ERR;
	154	}
	155	}
	156	#endif
3877dde4	157
d6ff054a	158	if ((ret = libusb_set_configuration(usb->devhdl, USB_CONFIGURATION))) {
6513f97f BV	159	sr_err("Failed to set configuration: %s.", libusb_error_name(ret));
	160	return SR_ERR;
	161	}
3877dde4	162
6513f97f BV	163	if ((ret = libusb_claim_interface(usb->devhdl, USB_INTERFACE))) {
	164	sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
	165	return SR_ERR;
	166	}
3877dde4 BV	167	sdi->status = SR_ST_ACTIVE;
3877dde4 BV	168
6513f97f	169	return ret;
3877dde4 BV	170	}
	171
	172	static int dev_close(struct sr_dev_inst *sdi)
	173	{
6513f97f	174	struct sr_usb_dev_inst *usb;
3877dde4	175
6513f97f BV	176	if (!di->priv) {
	177	sr_err("Driver was not initialized.");
	178	return SR_ERR;
	179	}
	180
	181	usb = sdi->conn;
	182	if (!usb->devhdl)
	183	/* Nothing to do. */
	184	return SR_OK;
3877dde4	185
6513f97f BV	186	libusb_release_interface(usb->devhdl, USB_INTERFACE);
	187	libusb_close(usb->devhdl);
	188	usb->devhdl = NULL;
3877dde4 BV	189	sdi->status = SR_ST_INACTIVE;
	190
	191	return SR_OK;
	192	}
	193
	194	static int cleanup(void)
	195	{
6513f97f BV	196	int ret;
6513f97f BV	197	struct drv_context *drvc;
3877dde4	198
6513f97f BV	199	if (!(drvc = di->priv))
	200	/* Can get called on an unused driver, doesn't matter. */
	201	return SR_OK;
3877dde4	202
6513f97f BV	203	ret = dev_clear();
	204	g_free(drvc);
	205	di->priv = NULL;
	206
	207	return ret;
3877dde4 BV	208	}
	209
	210	static int config_get(int key, GVariant *data, const struct sr_dev_inst sdi)
	211	{
6513f97f	212	struct dev_context *devc;
3877dde4	213
6513f97f	214	devc = sdi->priv;
3877dde4	215	switch (key) {
6513f97f BV	216	case SR_CONF_LIMIT_SAMPLES:
	217	*data = g_variant_new_uint64(devc->limit_samples);
	218	break;
	219	case SR_CONF_DATA_SOURCE:
	220	if (devc->data_source == DATA_SOURCE_LIVE)
	221	*data = g_variant_new_string("Live");
	222	else
	223	*data = g_variant_new_string("Memory");
	224	break;
3877dde4 BV	225	default:
	226	return SR_ERR_NA;
	227	}
	228
6513f97f	229	return SR_OK;
3877dde4 BV	230	}
	231
	232	static int config_set(int key, GVariant data, const struct sr_dev_inst sdi)
	233	{
6513f97f	234	struct dev_context *devc;
3877dde4	235	int ret;
6513f97f	236	const char *tmp_str;
3877dde4 BV	237
	238	if (sdi->status != SR_ST_ACTIVE)
	239	return SR_ERR_DEV_CLOSED;
	240
6513f97f BV	241	if (!di->priv) {
	242	sr_err("Driver was not initialized.");
	243	return SR_ERR;
	244	}
	245
	246	devc = sdi->priv;
3877dde4 BV	247	ret = SR_OK;
3877dde4 BV	248	switch (key) {
6513f97f BV	249	case SR_CONF_LIMIT_SAMPLES:
	250	devc->limit_samples = g_variant_get_uint64(data);
	251	sr_dbg("Setting sample limit to %" PRIu64 ".",
	252	devc->limit_samples);
	253	break;
	254	case SR_CONF_DATA_SOURCE:
	255	tmp_str = g_variant_get_string(data, NULL);
	256	if (!strcmp(tmp_str, "Live"))
	257	devc->data_source = DATA_SOURCE_LIVE;
	258	else if (!strcmp(tmp_str, "Memory"))
	259	devc->data_source = DATA_SOURCE_MEMORY;
	260	else
	261	return SR_ERR;
	262	break;
3877dde4 BV	263	default:
	264	ret = SR_ERR_NA;
	265	}
	266
	267	return ret;
	268	}
	269
	270	static int config_list(int key, GVariant *data, const struct sr_dev_inst sdi)
	271	{
3877dde4 BV	272
3877dde4 BV	273	(void)sdi;
3877dde4	274
3877dde4	275	switch (key) {
6513f97f BV	276	case SR_CONF_DEVICE_OPTIONS:
	277	*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
	278	hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
	279	break;
	280	case SR_CONF_DATA_SOURCE:
	281	*data = g_variant_new_strv(data_sources, ARRAY_SIZE(data_sources));
	282	break;
3877dde4 BV	283	default:
	284	return SR_ERR_NA;
	285	}
	286
6513f97f	287	return SR_OK;
3877dde4 BV	288	}
	289
	290	static int dev_acquisition_start(const struct sr_dev_inst *sdi,
	291	void *cb_data)
	292	{
6513f97f BV	293	struct drv_context *drvc;
	294	struct dev_context *devc;
	295	struct sr_usb_dev_inst *usb;
	296	const struct libusb_pollfd **pfd;
	297	int len, ret, i;
	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
d6ff054a BV	349	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
	350	for (i = 0; pfd[i]; i++) {
	351	/* Handle USB events every 10ms. */
	352	sr_source_add(pfd[i]->fd, pfd[i]->events, 10,
	353	uni_t_ut32x_handle_events, (void *)sdi);
	354	/* We'll need to remove this fd later. */
	355	devc->usbfd[i] = pfd[i]->fd;
	356	}
	357	devc->usbfd[i] = -1;
	358
3877dde4 BV	359	return SR_OK;
	360	}
	361
	362	static int dev_acquisition_stop(struct sr_dev_inst sdi, void cb_data)
	363	{
d6ff054a	364
3877dde4 BV	365	(void)cb_data;
	366
	367	if (sdi->status != SR_ST_ACTIVE)
	368	return SR_ERR_DEV_CLOSED;
	369
d6ff054a BV	370	/* Signal USB transfer handler to clean up and stop. */
d6ff054a BV	371	sdi->status = SR_ST_STOPPING;
3877dde4 BV	372
	373	return SR_OK;
	374	}
	375
	376	SR_PRIV struct sr_dev_driver uni_t_ut32x_driver_info = {
	377	.name = "uni-t-ut32x",
	378	.longname = "UNI-T UT32x",
	379	.api_version = 1,
	380	.init = init,
	381	.cleanup = cleanup,
	382	.scan = scan,
	383	.dev_list = dev_list,
	384	.dev_clear = dev_clear,
	385	.config_get = config_get,
	386	.config_set = config_set,
	387	.config_list = config_list,
	388	.dev_open = dev_open,
	389	.dev_close = dev_close,
	390	.dev_acquisition_start = dev_acquisition_start,
	391	.dev_acquisition_stop = dev_acquisition_stop,
	392	.priv = NULL,
	393	};