diff --git a/hardware/fx2lafw/fx2lafw.c b/hardware/fx2lafw/fx2lafw.c
index c1940041..d3fd85f2 100644
--- a/hardware/fx2lafw/fx2lafw.c
+++ b/hardware/fx2lafw/fx2lafw.c
@@ -194,6 +194,7 @@ static int fx2lafw_dev_open(struct sr_dev_inst *sdi)
 	libusb_device **devlist;
 	struct libusb_device_descriptor des;
 	struct dev_context *devc;
+	struct drv_context *drvc = fdi->priv;
 	struct version_info vi;
 	int ret, skip, i;
 	uint8_t revid;
@@ -205,7 +206,8 @@ static int fx2lafw_dev_open(struct sr_dev_inst *sdi)
 		return SR_ERR;
 
 	skip = 0;
-	const int device_count = libusb_get_device_list(NULL, &devlist);
+	const int device_count = libusb_get_device_list(
+		drvc->sr_ctx->libusb_ctx, &devlist);
 	if (device_count < 0) {
 		sr_err("fx2lafw: Failed to retrieve device list (%d)",
 			device_count);
@@ -408,12 +410,6 @@ static int hw_init(struct sr_context *sr_ctx)
 		return SR_ERR_MALLOC;
 	}
 
-	if (libusb_init(NULL) != 0) {
-		g_free(drvc);
-		sr_warn("fx2lafw: Failed to initialize libusb.");
-		return SR_ERR;
-	}
-
 	drvc->sr_ctx = sr_ctx;
 	fdi->priv = drvc;
 
@@ -441,7 +437,7 @@ static GSList *hw_scan(GSList *options)
 
 	/* Find all fx2lafw compatible devices and upload firmware to them. */
 	devices = NULL;
-	libusb_get_device_list(NULL, &devlist);
+	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	for (i = 0; devlist[i]; i++) {
 
 		if ((ret = libusb_get_device_descriptor(
@@ -613,8 +609,6 @@ static int hw_cleanup(void)
 
 	ret = clear_instances();
 
-	libusb_exit(NULL);
-
 	g_free(drvc);
 	fdi->priv = NULL;
 
@@ -686,13 +680,14 @@ static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 static int receive_data(int fd, int revents, void *cb_data)
 {
 	struct timeval tv;
+	struct drv_context *drvc = fdi->priv;
 
 	(void)fd;
 	(void)revents;
 	(void)cb_data;
 
 	tv.tv_sec = tv.tv_usec = 0;
-	libusb_handle_events_timeout(NULL, &tv);
+	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 
 	return TRUE;
 }
@@ -712,6 +707,7 @@ static void abort_acquisition(struct dev_context *devc)
 static void finish_acquisition(struct dev_context *devc)
 {
 	struct sr_datafeed_packet packet;
+	struct drv_context *drvc = fdi->priv;
 	int i;
 
 
@@ -721,7 +717,7 @@ static void finish_acquisition(struct dev_context *devc)
 
 	/* Remove fds from polling */
 	const struct libusb_pollfd **const lupfd =
-		libusb_get_pollfds(NULL);
+		libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 	for (i = 0; lupfd[i]; i++)
 		sr_source_remove(lupfd[i]->fd);
 	free(lupfd); /* NOT g_free()! */
@@ -947,6 +943,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 	struct sr_datafeed_header header;
 	struct sr_datafeed_meta_logic meta;
 	struct dev_context *devc;
+	struct drv_context *drvc = fdi->priv;
 	struct libusb_transfer *transfer;
 	const struct libusb_pollfd **lupfd;
 	unsigned int i;
@@ -997,7 +994,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 		devc->submitted_transfers++;
 	}
 
-	lupfd = libusb_get_pollfds(NULL);
+	lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 	for (i = 0; lupfd[i]; i++)
 		sr_source_add(lupfd[i]->fd, lupfd[i]->events,
 			      timeout, receive_data, NULL);
diff --git a/hardware/hantek-dso/api.c b/hardware/hantek-dso/api.c
index 08c11642..8d9a8b08 100644
--- a/hardware/hantek-dso/api.c
+++ b/hardware/hantek-dso/api.c
@@ -262,12 +262,6 @@ static int hw_init(struct sr_context *sr_ctx)
 		return SR_ERR_MALLOC;
 	}
 
-	if (libusb_init(NULL) != 0) {
-		g_free(drvc);
-		sr_err("Failed to initialize USB.");
-		return SR_ERR;
-	}
-
 	drvc->sr_ctx = sr_ctx;
 	hdi->priv = drvc;
 
@@ -295,7 +289,7 @@ static GSList *hw_scan(GSList *options)
 	clear_instances();
 
 	/* Find all Hantek DSO devices and upload firmware to all of them. */
-	libusb_get_device_list(NULL, &devlist);
+	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	for (i = 0; devlist[i]; i++) {
 		if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
 			sr_err("Failed to get device descriptor: %d.", ret);
@@ -419,8 +413,6 @@ static int hw_cleanup(void)
 
 	clear_instances();
 
-	libusb_exit(NULL);
-
 	return SR_OK;
 }
 
@@ -740,6 +732,7 @@ static int handle_event(int fd, int revents, void *cb_data)
 	struct sr_datafeed_packet packet;
 	struct timeval tv;
 	struct dev_context *devc;
+	struct drv_context *drvc = hdi->priv;
 	const struct libusb_pollfd **lupfd;
 	int num_probes, i;
 	uint32_t trigger_offset;
@@ -757,7 +750,7 @@ static int handle_event(int fd, int revents, void *cb_data)
 		 * TODO: Doesn't really cancel pending transfers so they might
 		 * come in after SR_DF_END is sent.
 		 */
-		lupfd = libusb_get_pollfds(NULL);
+		lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 		for (i = 0; lupfd[i]; i++)
 			sr_source_remove(lupfd[i]->fd);
 		free(lupfd);
@@ -772,7 +765,7 @@ static int handle_event(int fd, int revents, void *cb_data)
 
 	/* Always handle pending libusb events. */
 	tv.tv_sec = tv.tv_usec = 0;
-	libusb_handle_events_timeout(NULL, &tv);
+	libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 
 	/* TODO: ugh */
 	if (devc->dev_state == NEW_CAPTURE) {
@@ -856,6 +849,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 	struct sr_datafeed_header header;
 	struct sr_datafeed_meta_analog meta;
 	struct dev_context *devc;
+	struct drv_context *drvc = hdi->priv;
 	int i;
 
 	if (sdi->status != SR_ST_ACTIVE)
@@ -876,7 +870,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 		return SR_ERR;
 
 	devc->dev_state = CAPTURE;
-	lupfd = libusb_get_pollfds(NULL);
+	lupfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 	for (i = 0; lupfd[i]; i++)
 		sr_source_add(lupfd[i]->fd, lupfd[i]->events, TICK,
 			      handle_event, (void *)sdi);
diff --git a/hardware/hantek-dso/dso.c b/hardware/hantek-dso/dso.c
index 0f1285a3..0167f963 100644
--- a/hardware/hantek-dso/dso.c
+++ b/hardware/hantek-dso/dso.c
@@ -106,6 +106,7 @@ SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 	libusb_device **devlist;
 	struct libusb_device_descriptor des;
 	struct dev_context *devc;
+	struct drv_context *drvc = hantek_dso_driver_info.priv;
 	int err, skip, i;
 
 	devc = sdi->priv;
@@ -115,7 +116,7 @@ SR_PRIV int dso_open(struct sr_dev_inst *sdi)
 		return SR_ERR;
 
 	skip = 0;
-	libusb_get_device_list(NULL, &devlist);
+	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	for (i = 0; devlist[i]; i++) {
 		if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
 			sr_err("Failed to get device descriptor: %d.", err);
diff --git a/hardware/uni-t-dmm/api.c b/hardware/uni-t-dmm/api.c
index 8e390c06..11755bcd 100644
--- a/hardware/uni-t-dmm/api.c
+++ b/hardware/uni-t-dmm/api.c
@@ -55,7 +55,6 @@ static int clear_instances(void)
 
 static int hw_init(struct sr_context *sr_ctx, int dmm)
 {
-	int ret;
 	struct drv_context *drvc;
 
 	if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
@@ -63,12 +62,6 @@ static int hw_init(struct sr_context *sr_ctx, int dmm)
 		return SR_ERR_MALLOC;
 	}
 
-	if ((ret = libusb_init(NULL)) < 0) {
-		sr_err("Failed to initialize libusb: %s.",
-		       libusb_error_name(ret));
-		return SR_ERR;
-	}
-
 	if (dmm == UNI_T_UT61D)
 		di = di_ut61d;
 	else if (dmm == VOLTCRAFT_VC820)
@@ -107,7 +100,7 @@ static GSList *hw_scan(GSList *options)
 
 	devices = NULL;
 
-	if (!(l = sr_usb_connect(NULL, "1a86.e008")))
+	if (!(l = sr_usb_connect(drvc->sr_ctx->libusb_ctx, "1a86.e008")))
 		return NULL;
 
 	for (i = 0; i < (int)g_slist_length(l); i++) {
@@ -170,8 +163,6 @@ static int hw_cleanup(void)
 {
 	clear_instances();
 
-	// libusb_exit(NULL);
-
 	return SR_OK;
 }
 
diff --git a/hardware/victor-dmm/api.c b/hardware/victor-dmm/api.c
index 07c61faf..a389b079 100644
--- a/hardware/victor-dmm/api.c
+++ b/hardware/victor-dmm/api.c
@@ -112,7 +112,7 @@ static GSList *hw_scan(GSList *options)
 	clear_instances();
 
 	devices = NULL;
-	libusb_get_device_list(NULL, &devlist);
+	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	for (i = 0; devlist[i]; i++) {
 		if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 			sr_warn("Failed to get device descriptor: %s",
@@ -164,6 +164,7 @@ static GSList *hw_dev_list(void)
 static int hw_dev_open(struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
+	struct drv_context *drvc = di->priv;
 	libusb_device **devlist;
 	int ret, i;
 
@@ -173,7 +174,7 @@ static int hw_dev_open(struct sr_dev_inst *sdi)
 	}
 
 	devc = sdi->priv;
-	libusb_get_device_list(NULL, &devlist);
+	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	for (i = 0; devlist[i]; i++) {
 		if (libusb_get_bus_number(devlist[i]) != devc->usb->bus
 				|| libusb_get_device_address(devlist[i]) != devc->usb->address)
@@ -353,6 +354,7 @@ static void receive_transfer(struct libusb_transfer *transfer)
 static int handle_events(int fd, int revents, void *cb_data)
 {
 	struct dev_context *devc;
+	struct drv_context *drvc = di->priv;
 	struct sr_datafeed_packet packet;
 	struct sr_dev_inst *sdi;
 	struct timeval tv;
@@ -382,7 +384,8 @@ static int handle_events(int fd, int revents, void *cb_data)
 	}
 
 	memset(&tv, 0, sizeof(struct timeval));
-	libusb_handle_events_timeout_completed(NULL, &tv, NULL);
+	libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
+					       NULL);
 
 	return TRUE;
 }
@@ -394,6 +397,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 	struct sr_datafeed_header header;
 	struct sr_datafeed_meta_analog meta;
 	struct dev_context *devc;
+	struct drv_context *drvc = di->priv;
 	const struct libusb_pollfd **pfd;
 	struct libusb_transfer *transfer;
 	int ret, i;
@@ -422,7 +426,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 	meta.num_probes = 1;
 	sr_session_send(devc->cb_data, &packet);
 
-	pfd = libusb_get_pollfds(NULL);
+	pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 	for (i = 0; pfd[i]; i++) {
 		/* Handle USB events every 100ms, for decent latency. */
 		sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
diff --git a/hardware/zeroplus-logic-cube/zeroplus.c b/hardware/zeroplus-logic-cube/zeroplus.c
index a67e4600..70d90fe6 100644
--- a/hardware/zeroplus-logic-cube/zeroplus.c
+++ b/hardware/zeroplus-logic-cube/zeroplus.c
@@ -108,8 +108,6 @@ static const char *probe_names[NUM_PROBES + 1] = {
 SR_PRIV struct sr_dev_driver zeroplus_logic_cube_driver_info;
 static struct sr_dev_driver *zdi = &zeroplus_logic_cube_driver_info;
 
-static libusb_context *usb_context = NULL;
-
 /*
  * The hardware supports more samplerates than these, but these are the
  * options hardcoded into the vendor's Windows GUI.
@@ -314,11 +312,6 @@ static int hw_init(struct sr_context *sr_ctx)
 	drvc->sr_ctx = sr_ctx;
 	zdi->priv = drvc;
 
-	if (libusb_init(&usb_context) != 0) {
-		sr_err("zp: Failed to initialize USB.");
-		return 0;
-	}
-
 	return SR_OK;
 }
 
@@ -343,7 +336,7 @@ static GSList *hw_scan(GSList *options)
 
 	/* Find all ZEROPLUS analyzers and add them to device list. */
 	devcnt = 0;
-	libusb_get_device_list(usb_context, &devlist); /* TODO: Errors. */
+	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist); /* TODO: Errors. */
 
 	for (i = 0; devlist[i]; i++) {
 		ret = libusb_get_device_descriptor(devlist[i], &des);
@@ -423,6 +416,7 @@ static GSList *hw_dev_list(void)
 static int hw_dev_open(struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
+	struct drv_context *drvc = zdi->priv;
 	libusb_device **devlist, *dev;
 	struct libusb_device_descriptor des;
 	int device_count, ret, i;
@@ -432,7 +426,8 @@ static int hw_dev_open(struct sr_dev_inst *sdi)
 		return SR_ERR_ARG;
 	}
 
-	device_count = libusb_get_device_list(usb_context, &devlist);
+	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx,
+					      &devlist);
 	if (device_count < 0) {
 		sr_err("zp: Failed to retrieve device list");
 		return SR_ERR;
@@ -543,10 +538,6 @@ static int hw_cleanup(void)
 
 	clear_instances();
 
-	if (usb_context)
-		libusb_exit(usb_context);
-	usb_context = NULL;
-
 	return SR_OK;
 }