[libsigrok.git] / hardware / common / usb.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2012 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 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 <glib.h>
#include <libusb.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"

/* SR_CONF_CONN takes one of these: */
#define CONN_USB_VIDPID  "^([0-9a-z]{4})\\.([0-9a-z]{4})$"
#define CONN_USB_BUSADDR "^(\\d+)\\.(\\d+)$"

/* Some USBTMC-specific enums, as defined in the USBTMC standard. */
#define SUBCLASS_USBTMC 0x03
#define USBTMC_USB488   0x01

#define LOG_PREFIX "usb"

/**
 * Find USB devices according to a connection string.
 *
 * @param usb_ctx libusb context to use while scanning.
 * @param conn Connection string specifying the device(s) to match. This
 * can be of the form "<bus>.<address>", or "<vendorid>.<productid>".
 *
 * @return A GSList of struct sr_usb_dev_inst, with bus and address fields
 * matching the device that matched the connection string. The GSList and
 * its contents must be freed by the caller.
 */
SR_PRIV GSList *sr_usb_find(libusb_context *usb_ctx, const char *conn)
{
	struct sr_usb_dev_inst *usb;
	struct libusb_device **devlist;
	struct libusb_device_descriptor des;
	GSList *devices;
	GRegex *reg;
	GMatchInfo *match;
	int vid, pid, bus, addr, b, a, ret, i;
	char *mstr;

	vid = pid = bus = addr = 0;
	reg = g_regex_new(CONN_USB_VIDPID, 0, 0, NULL);
	if (g_regex_match(reg, conn, 0, &match)) {
		if ((mstr = g_match_info_fetch(match, 1)))
			vid = strtoul(mstr, NULL, 16);
		g_free(mstr);

		if ((mstr = g_match_info_fetch(match, 2)))
			pid = strtoul(mstr, NULL, 16);
		g_free(mstr);
		sr_dbg("Trying to find USB device with VID:PID = %04x:%04x.",
		       vid, pid);
	} else {
		g_match_info_unref(match);
		g_regex_unref(reg);
		reg = g_regex_new(CONN_USB_BUSADDR, 0, 0, NULL);
		if (g_regex_match(reg, conn, 0, &match)) {
			if ((mstr = g_match_info_fetch(match, 1)))
				bus = strtoul(mstr, NULL, 10);
			g_free(mstr);

			if ((mstr = g_match_info_fetch(match, 2)))
				addr = strtoul(mstr, NULL, 10);
			g_free(mstr);
			sr_dbg("Trying to find USB device with bus.address = "
			       "%d.%d.", bus, addr);
		}
	}
	g_match_info_unref(match);
	g_regex_unref(reg);

	if (vid + pid + bus + addr == 0) {
		sr_err("Neither VID:PID nor bus.address was specified.");
		return NULL;
	}

	if (bus > 64) {
		sr_err("Invalid bus specified: %d.", bus);
		return NULL;
	}

	if (addr > 127) {
		sr_err("Invalid address specified: %d.", addr);
		return NULL;
	}

	/* Looks like a valid USB device specification, but is it connected? */
	devices = NULL;
	libusb_get_device_list(usb_ctx, &devlist);
	for (i = 0; devlist[i]; i++) {
		if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("Failed to get device descriptor: %s.",
			       libusb_error_name(ret));
			continue;
		}

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

		b = libusb_get_bus_number(devlist[i]);
		a = libusb_get_device_address(devlist[i]);
		if (bus + addr && (b != bus || a != addr))
			continue;

		sr_dbg("Found USB device (VID:PID = %04x:%04x, bus.address = "
		       "%d.%d).", des.idVendor, des.idProduct, b, a);

		usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
				libusb_get_device_address(devlist[i]), NULL);
		devices = g_slist_append(devices, usb);
	}
	libusb_free_device_list(devlist, 1);

	sr_dbg("Found %d device(s).", g_slist_length(devices));
	
	return devices;
}

/**
 * Find USB devices supporting the USBTMC class
 *
 * @param usb_ctx libusb context to use while scanning.
 *
 * @return A GSList of struct sr_usb_dev_inst, with bus and address fields
 * indicating devices with USBTMC support.
 */
SR_PRIV GSList *sr_usb_find_usbtmc(libusb_context *usb_ctx)
{
	struct sr_usb_dev_inst *usb;
	struct libusb_device **devlist;
	struct libusb_device_descriptor des;
	struct libusb_config_descriptor *confdes;
	const struct libusb_interface_descriptor *intfdes;
	GSList *devices;
	int confidx, intfidx, ret, i;

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

		for (confidx = 0; confidx < des.bNumConfigurations; confidx++) {
			if (libusb_get_config_descriptor(devlist[i], confidx, &confdes) != 0) {
				sr_err("Failed to get configuration descriptor.");
				break;
			}
			for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) {
				intfdes = confdes->interface[intfidx].altsetting;
				if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION
						|| intfdes->bInterfaceSubClass != SUBCLASS_USBTMC
						|| intfdes->bInterfaceProtocol != USBTMC_USB488)
					continue;
				sr_dbg("Found USBTMC device (VID:PID = %04x:%04x, bus.address = "
					   "%d.%d).", des.idVendor, des.idProduct,
					   libusb_get_bus_number(devlist[i]),
					   libusb_get_device_address(devlist[i]));

				usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
						libusb_get_device_address(devlist[i]), NULL);
				devices = g_slist_append(devices, usb);
			}
			libusb_free_config_descriptor(confdes);
		}
	}
	libusb_free_device_list(devlist, 1);

	sr_dbg("Found %d device(s).", g_slist_length(devices));

	return devices;
}

SR_PRIV int sr_usb_open(libusb_context *usb_ctx, struct sr_usb_dev_inst *usb)
{
	struct libusb_device **devlist;
	struct libusb_device_descriptor des;
	int ret, r, cnt, i, a, b;

	sr_dbg("Trying to open USB device %d.%d.", usb->bus, usb->address);

	if ((cnt = libusb_get_device_list(usb_ctx, &devlist)) < 0) {
		sr_err("Failed to retrieve device list: %s.",
		       libusb_error_name(cnt));
		return SR_ERR;
	}

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

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

		if ((r = libusb_open(devlist[i], &usb->devhdl)) < 0) {
			sr_err("Failed to open device: %s.",
			       libusb_error_name(r));
			break;
		}

		sr_dbg("Opened USB device (VID:PID = %04x:%04x, bus.address = "
		       "%d.%d).", des.idVendor, des.idProduct, b, a);

		ret = SR_OK;
		break;
	}

	libusb_free_device_list(devlist, 1);

	return ret;
}

#ifdef _WIN32
SR_PRIV gpointer usb_thread(gpointer data)
{
	struct sr_context *ctx = data;

	while (ctx->usb_thread_running) {
		g_mutex_lock(&ctx->usb_mutex);
		libusb_wait_for_event(ctx->libusb_ctx, NULL);
		SetEvent(ctx->usb_event);
		g_mutex_unlock(&ctx->usb_mutex);
		g_thread_yield();
	}

	return NULL;
}

SR_PRIV int usb_callback(int fd, int revents, void *cb_data)
{
	struct sr_context *ctx = cb_data;
	int ret;

	g_mutex_lock(&ctx->usb_mutex);
	ret = ctx->usb_cb(fd, revents, ctx->usb_cb_data);

	if (ctx->usb_thread_running) {
		ResetEvent(ctx->usb_event);
		g_mutex_unlock(&ctx->usb_mutex);
	}

	return ret;
}
#endif

SR_PRIV int usb_source_add(struct sr_context *ctx, int timeout,
		sr_receive_data_callback_t cb, void *cb_data)
{
	if (ctx->usb_source_present) {
		sr_err("A USB event source is already present.");
		return SR_ERR;
	}

#ifdef _WIN32
	ctx->usb_event = CreateEvent(NULL, TRUE, FALSE, NULL);
	g_mutex_init(&ctx->usb_mutex);
	ctx->usb_thread_running = TRUE;
	ctx->usb_thread = g_thread_new("usb", usb_thread, ctx);
	ctx->usb_pollfd.fd = ctx->usb_event;
	ctx->usb_pollfd.events = G_IO_IN;
	ctx->usb_cb = cb;
	ctx->usb_cb_data = cb_data;
	sr_session_source_add_pollfd(&ctx->usb_pollfd, timeout, usb_callback, ctx);
#else
	const struct libusb_pollfd **lupfd;
	unsigned int i;

	lupfd = libusb_get_pollfds(ctx->libusb_ctx);
	for (i = 0; lupfd[i]; i++)
		sr_source_add(lupfd[i]->fd, lupfd[i]->events, timeout, cb, cb_data);
	free(lupfd);
#endif
	ctx->usb_source_present = TRUE;

	return SR_OK;
}

SR_PRIV int usb_source_remove(struct sr_context *ctx)
{
	if (!ctx->usb_source_present)
		return SR_OK;

#ifdef _WIN32
	ctx->usb_thread_running = FALSE;
	g_mutex_unlock(&ctx->usb_mutex);
	libusb_unlock_events(ctx->libusb_ctx);
	g_thread_join(ctx->usb_thread);
	g_mutex_clear(&ctx->usb_mutex);
	sr_session_source_remove_pollfd(&ctx->usb_pollfd);
	CloseHandle(ctx->usb_event);
#else
	const struct libusb_pollfd **lupfd;
	unsigned int i;

	lupfd = libusb_get_pollfds(ctx->libusb_ctx);
	for (i = 0; lupfd[i]; i++)
		sr_source_remove(lupfd[i]->fd);
	free(lupfd);
#endif
	ctx->usb_source_present = FALSE;

	return SR_OK;
}
Commit	Line	Data
0c632d36	1	/*
50985c20	2	* This file is part of the libsigrok project.
0c632d36 UH	3	*
	4	* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <stdlib.h>
	23	#include <glib.h>
	24	#include <libusb.h>
	25	#include "libsigrok.h"
	26	#include "libsigrok-internal.h"
	27
1953564a	28	/* SR_CONF_CONN takes one of these: */
1eb0a0df	29	#define CONN_USB_VIDPID "^([0-9a-z]{4})\\.([0-9a-z]{4})$"
0c632d36 UH	30	#define CONN_USB_BUSADDR "^(\\d+)\\.(\\d+)$"
0c632d36 UH	31
91162629 BV	32	/* Some USBTMC-specific enums, as defined in the USBTMC standard. */
	33	#define SUBCLASS_USBTMC 0x03
	34	#define USBTMC_USB488 0x01
	35
3544f848	36	#define LOG_PREFIX "usb"
0c632d36	37
7ae6a758 BV	38	/**
	39	* Find USB devices according to a connection string.
	40	*
	41	* @param usb_ctx libusb context to use while scanning.
	42	* @param conn Connection string specifying the device(s) to match. This
	43	* can be of the form "<bus>.<address>", or "<vendorid>.<productid>".
	44	*
	45	* @return A GSList of struct sr_usb_dev_inst, with bus and address fields
	46	* matching the device that matched the connection string. The GSList and
	47	* its contents must be freed by the caller.
	48	*/
	49	SR_PRIV GSList sr_usb_find(libusb_context usb_ctx, const char *conn)
0c632d36	50	{
7ae6a758	51	struct sr_usb_dev_inst *usb;
0c632d36 UH	52	struct libusb_device **devlist;
	53	struct libusb_device_descriptor des;
	54	GSList *devices;
	55	GRegex *reg;
	56	GMatchInfo *match;
	57	int vid, pid, bus, addr, b, a, ret, i;
	58	char *mstr;
	59
	60	vid = pid = bus = addr = 0;
	61	reg = g_regex_new(CONN_USB_VIDPID, 0, 0, NULL);
	62	if (g_regex_match(reg, conn, 0, &match)) {
e7f378fd	63	if ((mstr = g_match_info_fetch(match, 1)))
0c632d36	64	vid = strtoul(mstr, NULL, 16);
0c632d36 UH	65	g_free(mstr);
0c632d36 UH	66
e7f378fd	67	if ((mstr = g_match_info_fetch(match, 2)))
0c632d36	68	pid = strtoul(mstr, NULL, 16);
0c632d36 UH	69	g_free(mstr);
	70	sr_dbg("Trying to find USB device with VID:PID = %04x:%04x.",
	71	vid, pid);
	72	} else {
	73	g_match_info_unref(match);
	74	g_regex_unref(reg);
	75	reg = g_regex_new(CONN_USB_BUSADDR, 0, 0, NULL);
	76	if (g_regex_match(reg, conn, 0, &match)) {
e7f378fd	77	if ((mstr = g_match_info_fetch(match, 1)))
1eb0a0df	78	bus = strtoul(mstr, NULL, 10);
0c632d36 UH	79	g_free(mstr);
0c632d36 UH	80
e7f378fd	81	if ((mstr = g_match_info_fetch(match, 2)))
1eb0a0df	82	addr = strtoul(mstr, NULL, 10);
0c632d36 UH	83	g_free(mstr);
	84	sr_dbg("Trying to find USB device with bus.address = "
	85	"%d.%d.", bus, addr);
	86	}
	87	}
	88	g_match_info_unref(match);
	89	g_regex_unref(reg);
	90
	91	if (vid + pid + bus + addr == 0) {
e7f378fd	92	sr_err("Neither VID:PID nor bus.address was specified.");
0c632d36 UH	93	return NULL;
	94	}
	95
	96	if (bus > 64) {
	97	sr_err("Invalid bus specified: %d.", bus);
	98	return NULL;
	99	}
	100
	101	if (addr > 127) {
	102	sr_err("Invalid address specified: %d.", addr);
	103	return NULL;
	104	}
	105
	106	/* Looks like a valid USB device specification, but is it connected? */
	107	devices = NULL;
	108	libusb_get_device_list(usb_ctx, &devlist);
	109	for (i = 0; devlist[i]; i++) {
	110	if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
d4928d71 PS	111	sr_err("Failed to get device descriptor: %s.",
d4928d71 PS	112	libusb_error_name(ret));
0c632d36 UH	113	continue;
	114	}
	115
7ae6a758	116	if (vid + pid && (des.idVendor != vid \|\| des.idProduct != pid))
0c632d36	117	continue;
0c632d36	118
7ae6a758 BV	119	b = libusb_get_bus_number(devlist[i]);
	120	a = libusb_get_device_address(devlist[i]);
	121	if (bus + addr && (b != bus \|\| a != addr))
0c632d36	122	continue;
0c632d36 UH	123
	124	sr_dbg("Found USB device (VID:PID = %04x:%04x, bus.address = "
	125	"%d.%d).", des.idVendor, des.idProduct, b, a);
	126
7ae6a758 BV	127	usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	128	libusb_get_device_address(devlist[i]), NULL);
	129	devices = g_slist_append(devices, usb);
0c632d36 UH	130	}
	131	libusb_free_device_list(devlist, 1);
	132
	133	sr_dbg("Found %d device(s).", g_slist_length(devices));
	134
	135	return devices;
	136	}
	137
91162629 BV	138	/**
	139	* Find USB devices supporting the USBTMC class
	140	*
	141	* @param usb_ctx libusb context to use while scanning.
	142	*
	143	* @return A GSList of struct sr_usb_dev_inst, with bus and address fields
	144	* indicating devices with USBTMC support.
	145	*/
	146	SR_PRIV GSList sr_usb_find_usbtmc(libusb_context usb_ctx)
	147	{
	148	struct sr_usb_dev_inst *usb;
	149	struct libusb_device **devlist;
	150	struct libusb_device_descriptor des;
	151	struct libusb_config_descriptor *confdes;
	152	const struct libusb_interface_descriptor *intfdes;
	153	GSList *devices;
	154	int confidx, intfidx, ret, i;
	155
	156	devices = NULL;
	157	libusb_get_device_list(usb_ctx, &devlist);
	158	for (i = 0; devlist[i]; i++) {
	159	if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
	160	sr_err("Failed to get device descriptor: %s.",
	161	libusb_error_name(ret));
	162	continue;
	163	}
	164
	165	for (confidx = 0; confidx < des.bNumConfigurations; confidx++) {
	166	if (libusb_get_config_descriptor(devlist[i], confidx, &confdes) != 0) {
	167	sr_err("Failed to get configuration descriptor.");
	168	break;
	169	}
	170	for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) {
	171	intfdes = confdes->interface[intfidx].altsetting;
	172	if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION
	173	\|\| intfdes->bInterfaceSubClass != SUBCLASS_USBTMC
	174	\|\| intfdes->bInterfaceProtocol != USBTMC_USB488)
	175	continue;
	176	sr_dbg("Found USBTMC device (VID:PID = %04x:%04x, bus.address = "
	177	"%d.%d).", des.idVendor, des.idProduct,
	178	libusb_get_bus_number(devlist[i]),
	179	libusb_get_device_address(devlist[i]));
	180
	181	usb = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
	182	libusb_get_device_address(devlist[i]), NULL);
	183	devices = g_slist_append(devices, usb);
	184	}
d8e3685c	185	libusb_free_config_descriptor(confdes);
91162629 BV	186	}
	187	}
	188	libusb_free_device_list(devlist, 1);
	189
	190	sr_dbg("Found %d device(s).", g_slist_length(devices));
	191
	192	return devices;
	193	}
	194
0c632d36 UH	195	SR_PRIV int sr_usb_open(libusb_context usb_ctx, struct sr_usb_dev_inst usb)
	196	{
	197	struct libusb_device **devlist;
	198	struct libusb_device_descriptor des;
	199	int ret, r, cnt, i, a, b;
	200
c5f1a021	201	sr_dbg("Trying to open USB device %d.%d.", usb->bus, usb->address);
0c632d36 UH	202
	203	if ((cnt = libusb_get_device_list(usb_ctx, &devlist)) < 0) {
	204	sr_err("Failed to retrieve device list: %s.",
	205	libusb_error_name(cnt));
	206	return SR_ERR;
	207	}
	208
	209	ret = SR_ERR;
	210	for (i = 0; i < cnt; i++) {
	211	if ((r = libusb_get_device_descriptor(devlist[i], &des)) < 0) {
	212	sr_err("Failed to get device descriptor: %s.",
	213	libusb_error_name(r));
	214	continue;
	215	}
	216
	217	b = libusb_get_bus_number(devlist[i]);
	218	a = libusb_get_device_address(devlist[i]);
c5f1a021	219	if (b != usb->bus \|\| a != usb->address)
0c632d36	220	continue;
0c632d36 UH	221
	222	if ((r = libusb_open(devlist[i], &usb->devhdl)) < 0) {
	223	sr_err("Failed to open device: %s.",
	224	libusb_error_name(r));
	225	break;
	226	}
	227
	228	sr_dbg("Opened USB device (VID:PID = %04x:%04x, bus.address = "
	229	"%d.%d).", des.idVendor, des.idProduct, b, a);
	230
	231	ret = SR_OK;
	232	break;
	233	}
	234
	235	libusb_free_device_list(devlist, 1);
	236
	237	return ret;
	238	}
6c60facc	239
5321ac6b ML	240	#ifdef _WIN32
	241	SR_PRIV gpointer usb_thread(gpointer data)
	242	{
	243	struct sr_context *ctx = data;
	244
	245	while (ctx->usb_thread_running) {
	246	g_mutex_lock(&ctx->usb_mutex);
	247	libusb_wait_for_event(ctx->libusb_ctx, NULL);
	248	SetEvent(ctx->usb_event);
	249	g_mutex_unlock(&ctx->usb_mutex);
	250	g_thread_yield();
	251	}
	252
	253	return NULL;
	254	}
	255
	256	SR_PRIV int usb_callback(int fd, int revents, void *cb_data)
	257	{
	258	struct sr_context *ctx = cb_data;
	259	int ret;
	260
	261	g_mutex_lock(&ctx->usb_mutex);
	262	ret = ctx->usb_cb(fd, revents, ctx->usb_cb_data);
34ea7f96 ML	263
	264	if (ctx->usb_thread_running) {
	265	ResetEvent(ctx->usb_event);
	266	g_mutex_unlock(&ctx->usb_mutex);
	267	}
5321ac6b ML	268
	269	return ret;
	270	}
	271	#endif
	272
6c60facc ML	273	SR_PRIV int usb_source_add(struct sr_context *ctx, int timeout,
	274	sr_receive_data_callback_t cb, void *cb_data)
	275	{
6640324f ML	276	if (ctx->usb_source_present) {
	277	sr_err("A USB event source is already present.");
	278	return SR_ERR;
	279	}
	280
6c60facc	281	#ifdef _WIN32
5321ac6b ML	282	ctx->usb_event = CreateEvent(NULL, TRUE, FALSE, NULL);
	283	g_mutex_init(&ctx->usb_mutex);
	284	ctx->usb_thread_running = TRUE;
	285	ctx->usb_thread = g_thread_new("usb", usb_thread, ctx);
	286	ctx->usb_pollfd.fd = ctx->usb_event;
	287	ctx->usb_pollfd.events = G_IO_IN;
	288	ctx->usb_cb = cb;
	289	ctx->usb_cb_data = cb_data;
	290	sr_session_source_add_pollfd(&ctx->usb_pollfd, timeout, usb_callback, ctx);
6c60facc ML	291	#else
	292	const struct libusb_pollfd **lupfd;
	293	unsigned int i;
	294
	295	lupfd = libusb_get_pollfds(ctx->libusb_ctx);
	296	for (i = 0; lupfd[i]; i++)
	297	sr_source_add(lupfd[i]->fd, lupfd[i]->events, timeout, cb, cb_data);
	298	free(lupfd);
5321ac6b	299	#endif
6640324f	300	ctx->usb_source_present = TRUE;
6c60facc ML	301
6c60facc ML	302	return SR_OK;
6c60facc ML	303	}
	304
	305	SR_PRIV int usb_source_remove(struct sr_context *ctx)
	306	{
6640324f ML	307	if (!ctx->usb_source_present)
	308	return SR_OK;
	309
6c60facc	310	#ifdef _WIN32
5321ac6b	311	ctx->usb_thread_running = FALSE;
b5328e1d	312	g_mutex_unlock(&ctx->usb_mutex);
5321ac6b ML	313	libusb_unlock_events(ctx->libusb_ctx);
	314	g_thread_join(ctx->usb_thread);
	315	g_mutex_clear(&ctx->usb_mutex);
	316	sr_session_source_remove_pollfd(&ctx->usb_pollfd);
	317	CloseHandle(ctx->usb_event);
6c60facc ML	318	#else
	319	const struct libusb_pollfd **lupfd;
	320	unsigned int i;
	321
	322	lupfd = libusb_get_pollfds(ctx->libusb_ctx);
	323	for (i = 0; lupfd[i]; i++)
	324	sr_source_remove(lupfd[i]->fd);
	325	free(lupfd);
5321ac6b	326	#endif
6640324f	327	ctx->usb_source_present = FALSE;
6c60facc ML	328
6c60facc ML	329	return SR_OK;
6c60facc	330	}