libusb20 is now installed as libusb, remove the version number from the

directory name.

1 files changed, 948 insertions, 0 deletions

diff --git a/lib/libusb/libusb20_compat01.c b/lib/libusb/libusb20_compat01.c
new file mode 100644
index 0000000..5e1e8e1
--- /dev/null
+++ b/lib/libusb/libusb20_compat01.c
@@ -0,0 +1,948 @@
+/* $FreeBSD$ */
+/*-
+ * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * This file contains the emulation layer for LibUSB v0.1 from sourceforge.
+ */
+
+#include <sys/queue.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "libusb20.h"
+#include "libusb20_desc.h"
+#include "libusb20_int.h"
+#include "usb.h"
+
+/*
+ * The two following macros were taken from the original LibUSB v0.1
+ * for sake of compatibility:
+ */
+#define	LIST_ADD(begin, ent)	   \
+  do {				   \
+    if (begin) {		   \
+      ent->next = begin;	   \
+      ent->next->prev = ent;	   \
+    } else {			   \
+      ent->next = NULL;		   \
+    }				   \
+    ent->prev = NULL;		   \
+    begin = ent;		   \
+  } while(0)
+
+#define	LIST_DEL(begin, ent)		 \
+  do {					 \
+    if (ent->prev) {			 \
+      ent->prev->next = ent->next;	 \
+    } else {				 \
+      begin = ent->next;		 \
+    }					 \
+    if (ent->next) {			 \
+      ent->next->prev = ent->prev;	 \
+    }					 \
+    ent->prev = NULL;			 \
+    ent->next = NULL;			 \
+  } while (0)
+
+struct usb_bus *usb_busses = NULL;
+
+static struct usb_bus usb_global_bus = {
+	.dirname = {"/dev/usb"},
+	.root_dev = NULL,
+	.devices = NULL,
+};
+
+static struct libusb20_backend *usb_backend = NULL;
+
+struct usb_parse_state {
+
+	struct {
+		struct libusb20_endpoint *currep;
+		struct libusb20_interface *currifc;
+		struct libusb20_config *currcfg;
+		struct libusb20_me_struct *currextra;
+	}	a;
+
+	struct {
+		struct usb_config_descriptor *currcfg;
+		struct usb_interface_descriptor *currifc;
+		struct usb_endpoint_descriptor *currep;
+		struct usb_interface *currifcw;
+		uint8_t *currextra;
+	}	b;
+
+	uint8_t	preparse;
+};
+
+static uint8_t
+usb_get_first_claimed_interface(usb_dev_handle * dev)
+{
+	struct libusb20_device *pdev = (void *)dev;
+	uint32_t x;
+	uint8_t y;
+
+	x = pdev->claimed_interfaces;
+
+	for (y = 0; y != 32; y++) {
+		if (x & (1 << y))
+			break;
+	}
+
+	if (y == 32)
+		y = 0xFF;		/* dummy */
+
+	return (y);
+}
+
+static struct libusb20_transfer *
+usb_get_transfer_by_ep_no(usb_dev_handle * dev, uint8_t ep_no)
+{
+	struct libusb20_device *pdev = (void *)dev;
+	struct libusb20_transfer *xfer;
+	int err;
+	uint32_t bufsize;
+	uint8_t x;
+	uint8_t speed;
+
+	x = (ep_no & LIBUSB20_ENDPOINT_ADDRESS_MASK) * 2;
+
+	if (ep_no & LIBUSB20_ENDPOINT_DIR_MASK) {
+		/* this is an IN endpoint */
+		x |= 1;
+	}
+	speed = libusb20_dev_get_speed(pdev);
+
+	/* select a sensible buffer size */
+	if (speed == LIBUSB20_SPEED_LOW) {
+		bufsize = 256;
+	} else if (speed == LIBUSB20_SPEED_FULL) {
+		bufsize = 4096;
+	} else {
+		bufsize = 16384;
+	}
+
+	xfer = libusb20_tr_get_pointer(pdev, x);
+
+	if (xfer == NULL)
+		return (xfer);
+
+	err = libusb20_tr_open(xfer, bufsize, 1, ep_no);
+	if (err == LIBUSB20_ERROR_BUSY) {
+		/* already opened */
+		return (xfer);
+	} else if (err) {
+		return (NULL);
+	}
+	/* success */
+	return (xfer);
+}
+
+usb_dev_handle *
+usb_open(struct usb_device *dev)
+{
+	int err;
+
+	err = libusb20_dev_open(dev->dev, 16 * 2);
+	if (err == LIBUSB20_ERROR_BUSY) {
+		/*
+		 * Workaround buggy USB applications which open the USB
+		 * device multiple times:
+		 */
+		return (dev->dev);
+	}
+	if (err)
+		return (NULL);
+
+	/*
+	 * Dequeue USB device from backend queue so that it does not get
+	 * freed when the backend is re-scanned:
+	 */
+	libusb20_be_dequeue_device(usb_backend, dev->dev);
+
+	return (dev->dev);
+}
+
+int
+usb_close(usb_dev_handle * udev)
+{
+	struct usb_device *dev;
+	int err;
+
+	err = libusb20_dev_close((void *)udev);
+
+	if (err)
+		return (-1);
+
+	if (usb_backend != NULL) {
+		/*
+		 * Enqueue USB device to backend queue so that it gets freed
+		 * when the backend is re-scanned:
+		 */
+		libusb20_be_enqueue_device(usb_backend, (void *)udev);
+	} else {
+		/*
+		 * The backend is gone. Free device data so that we
+		 * don't start leaking memory!
+		 */
+		dev = usb_device(udev);
+		libusb20_dev_free((void *)udev);
+		LIST_DEL(usb_global_bus.devices, dev);
+		free(dev);
+	}
+	return (0);
+}
+
+int
+usb_get_string(usb_dev_handle * dev, int strindex,
+    int langid, char *buf, size_t buflen)
+{
+	int err;
+
+	err = libusb20_dev_req_string_sync((void *)dev,
+	    strindex, langid, buf, buflen);
+
+	if (err)
+		return (-1);
+
+	return (0);
+}
+
+int
+usb_get_string_simple(usb_dev_handle * dev, int strindex,
+    char *buf, size_t buflen)
+{
+	int err;
+
+	err = libusb20_dev_req_string_simple_sync((void *)dev,
+	    strindex, buf, buflen);
+
+	if (err)
+		return (-1);
+
+	return (strlen(buf));
+}
+
+int
+usb_get_descriptor_by_endpoint(usb_dev_handle * udev, int ep, uint8_t type,
+    uint8_t ep_index, void *buf, int size)
+{
+	memset(buf, 0, size);
+
+	return (usb_control_msg(udev, ep | USB_ENDPOINT_IN,
+	    USB_REQ_GET_DESCRIPTOR, (type << 8) + ep_index, 0,
+	    buf, size, 1000));
+}
+
+int
+usb_get_descriptor(usb_dev_handle * udev, uint8_t type, uint8_t desc_index,
+    void *buf, int size)
+{
+	memset(buf, 0, size);
+
+	return (usb_control_msg(udev, USB_ENDPOINT_IN, USB_REQ_GET_DESCRIPTOR,
+	    (type << 8) + desc_index, 0, buf, size, 1000));
+}
+
+int
+usb_parse_descriptor(uint8_t *source, char *description, void *dest)
+{
+	uint8_t *sp = source;
+	uint8_t *dp = dest;
+	uint16_t w;
+	uint32_t d;
+	char *cp;
+
+	for (cp = description; *cp; cp++) {
+		switch (*cp) {
+		case 'b':		/* 8-bit byte */
+			*dp++ = *sp++;
+			break;
+			/*
+			 * 16-bit word, convert from little endian to CPU
+			 */
+		case 'w':
+			w = (sp[1] << 8) | sp[0];
+			sp += 2;
+			/* Align to word boundary */
+			dp += ((dp - (uint8_t *)0) & 1);
+			*((uint16_t *)dp) = w;
+			dp += 2;
+			break;
+			/*
+			 * 32-bit dword, convert from little endian to CPU
+			 */
+		case 'd':
+			d = (sp[3] << 24) | (sp[2] << 16) |
+			    (sp[1] << 8) | sp[0];
+			sp += 4;
+			/* Align to word boundary */
+			dp += ((dp - (uint8_t *)0) & 1);
+			/* Align to double word boundary */
+			dp += ((dp - (uint8_t *)0) & 2);
+			*((uint32_t *)dp) = d;
+			dp += 4;
+			break;
+		}
+	}
+	return (sp - source);
+}
+
+static void
+usb_parse_extra(struct usb_parse_state *ps, uint8_t **pptr, int *plen)
+{
+	void *ptr;
+	uint16_t len;
+
+	ptr = ps->a.currextra->ptr;
+	len = ps->a.currextra->len;
+
+	if (ps->preparse == 0) {
+		memcpy(ps->b.currextra, ptr, len);
+		*pptr = ps->b.currextra;
+		*plen = len;
+	}
+	ps->b.currextra += len;
+	return;
+}
+
+static void
+usb_parse_endpoint(struct usb_parse_state *ps)
+{
+	struct usb_endpoint_descriptor *bep;
+	struct libusb20_endpoint *aep;
+
+	aep = ps->a.currep;
+	bep = ps->b.currep++;
+
+	if (ps->preparse == 0) {
+		/* copy descriptor fields */
+		bep->bLength = aep->desc.bLength;
+		bep->bDescriptorType = aep->desc.bDescriptorType;
+		bep->bEndpointAddress = aep->desc.bEndpointAddress;
+		bep->bmAttributes = aep->desc.bmAttributes;
+		bep->wMaxPacketSize = aep->desc.wMaxPacketSize;
+		bep->bInterval = aep->desc.bInterval;
+		bep->bRefresh = aep->desc.bRefresh;
+		bep->bSynchAddress = aep->desc.bSynchAddress;
+	}
+	ps->a.currextra = &aep->extra;
+	usb_parse_extra(ps, &bep->extra, &bep->extralen);
+	return;
+}
+
+static void
+usb_parse_iface_sub(struct usb_parse_state *ps)
+{
+	struct libusb20_interface *aifc;
+	struct usb_interface_descriptor *bifc;
+	uint8_t x;
+
+	aifc = ps->a.currifc;
+	bifc = ps->b.currifc++;
+
+	if (ps->preparse == 0) {
+		/* copy descriptor fields */
+		bifc->bLength = aifc->desc.bLength;
+		bifc->bDescriptorType = aifc->desc.bDescriptorType;
+		bifc->bInterfaceNumber = aifc->desc.bInterfaceNumber;
+		bifc->bAlternateSetting = aifc->desc.bAlternateSetting;
+		bifc->bNumEndpoints = aifc->num_endpoints;
+		bifc->bInterfaceClass = aifc->desc.bInterfaceClass;
+		bifc->bInterfaceSubClass = aifc->desc.bInterfaceSubClass;
+		bifc->bInterfaceProtocol = aifc->desc.bInterfaceProtocol;
+		bifc->iInterface = aifc->desc.iInterface;
+		bifc->endpoint = ps->b.currep;
+	}
+	for (x = 0; x != aifc->num_endpoints; x++) {
+		ps->a.currep = aifc->endpoints + x;
+		usb_parse_endpoint(ps);
+	}
+
+	ps->a.currextra = &aifc->extra;
+	usb_parse_extra(ps, &bifc->extra, &bifc->extralen);
+	return;
+}
+
+static void
+usb_parse_iface(struct usb_parse_state *ps)
+{
+	struct libusb20_interface *aifc;
+	struct usb_interface *bifc;
+	uint8_t x;
+
+	aifc = ps->a.currifc;
+	bifc = ps->b.currifcw++;
+
+	if (ps->preparse == 0) {
+		/* initialise interface wrapper */
+		bifc->altsetting = ps->b.currifc;
+		bifc->num_altsetting = aifc->num_altsetting + 1;
+	}
+	usb_parse_iface_sub(ps);
+
+	for (x = 0; x != aifc->num_altsetting; x++) {
+		ps->a.currifc = aifc->altsetting + x;
+		usb_parse_iface_sub(ps);
+	}
+	return;
+}
+
+static void
+usb_parse_config(struct usb_parse_state *ps)
+{
+	struct libusb20_config *acfg;
+	struct usb_config_descriptor *bcfg;
+	uint8_t x;
+
+	acfg = ps->a.currcfg;
+	bcfg = ps->b.currcfg;
+
+	if (ps->preparse == 0) {
+		/* initialise config wrapper */
+		bcfg->bLength = acfg->desc.bLength;
+		bcfg->bDescriptorType = acfg->desc.bDescriptorType;
+		bcfg->wTotalLength = acfg->desc.wTotalLength;
+		bcfg->bNumInterfaces = acfg->num_interface;
+		bcfg->bConfigurationValue = acfg->desc.bConfigurationValue;
+		bcfg->iConfiguration = acfg->desc.iConfiguration;
+		bcfg->bmAttributes = acfg->desc.bmAttributes;
+		bcfg->MaxPower = acfg->desc.bMaxPower;
+		bcfg->interface = ps->b.currifcw;
+	}
+	for (x = 0; x != acfg->num_interface; x++) {
+		ps->a.currifc = acfg->interface + x;
+		usb_parse_iface(ps);
+	}
+
+	ps->a.currextra = &acfg->extra;
+	usb_parse_extra(ps, &bcfg->extra, &bcfg->extralen);
+	return;
+}
+
+int
+usb_parse_configuration(struct usb_config_descriptor *config,
+    uint8_t *buffer)
+{
+	struct usb_parse_state ps;
+	uint8_t *ptr;
+	uint32_t a;
+	uint32_t b;
+	uint32_t c;
+	uint32_t d;
+
+	if ((buffer == NULL) || (config == NULL)) {
+		return (-1);
+	}
+	memset(&ps, 0, sizeof(ps));
+
+	ps.a.currcfg = libusb20_parse_config_desc(buffer);
+	ps.b.currcfg = config;
+	if (ps.a.currcfg == NULL) {
+		/* could not parse config or out of memory */
+		return (-1);
+	}
+	/* do the pre-parse */
+	ps.preparse = 1;
+	usb_parse_config(&ps);
+
+	a = ((uint8_t *)(ps.b.currifcw) - ((uint8_t *)0));
+	b = ((uint8_t *)(ps.b.currifc) - ((uint8_t *)0));
+	c = ((uint8_t *)(ps.b.currep) - ((uint8_t *)0));
+	d = ((uint8_t *)(ps.b.currextra) - ((uint8_t *)0));
+
+	/* allocate memory for our configuration */
+	ptr = malloc(a + b + c + d);
+
+	/* "currifcw" must be first, hence this pointer is freed */
+	ps.b.currifcw = (void *)(ptr);
+	ps.b.currifc = (void *)(ptr + a);
+	ps.b.currep = (void *)(ptr + a + b);
+	ps.b.currextra = (void *)(ptr + a + b + c);
+
+	/* generate a libusb v0.1 compatible structure */
+	ps.preparse = 0;
+	usb_parse_config(&ps);
+
+	/* free config structure */
+	free(ps.a.currcfg);
+
+	return (0);			/* success */
+}
+
+void
+usb_destroy_configuration(struct usb_device *dev)
+{
+	uint8_t c;
+
+	if (dev->config == NULL) {
+		return;
+	}
+	for (c = 0; c != dev->descriptor.bNumConfigurations; c++) {
+		struct usb_config_descriptor *cf = &dev->config[c];
+
+		if (cf->interface != NULL) {
+			free(cf->interface);
+			cf->interface = NULL;
+		}
+	}
+
+	free(dev->config);
+	dev->config = NULL;
+	return;
+}
+
+void
+usb_fetch_and_parse_descriptors(usb_dev_handle * udev)
+{
+	struct usb_device *dev;
+	struct libusb20_device *pdev;
+	uint8_t *ptr;
+	int error;
+	uint32_t size;
+	uint16_t len;
+	uint8_t x;
+
+	if (udev == NULL) {
+		/* be NULL safe */
+		return;
+	}
+	dev = usb_device(udev);
+	pdev = (void *)udev;
+
+	if (dev->descriptor.bNumConfigurations == 0) {
+		/* invalid device */
+		return;
+	}
+	size = dev->descriptor.bNumConfigurations *
+	    sizeof(struct usb_config_descriptor);
+
+	dev->config = malloc(size);
+	if (dev->config == NULL) {
+		/* out of memory */
+		return;
+	}
+	memset(dev->config, 0, size);
+
+	for (x = 0; x != dev->descriptor.bNumConfigurations; x++) {
+
+		error = (pdev->methods->get_config_desc_full) (
+		    pdev, &ptr, &len, x);
+
+		if (error) {
+			usb_destroy_configuration(dev);
+			return;
+		}
+		usb_parse_configuration(dev->config + x, ptr);
+
+		/* free config buffer */
+		free(ptr);
+	}
+	return;
+}
+
+static int
+usb_std_io(usb_dev_handle * dev, int ep, char *bytes, int size,
+    int timeout, int is_intr)
+{
+	struct libusb20_transfer *xfer;
+	uint32_t temp;
+	uint32_t maxsize;
+	uint32_t actlen;
+	char *oldbytes;
+
+	xfer = usb_get_transfer_by_ep_no(dev, ep);
+	if (xfer == NULL)
+		return (-1);
+
+	if (libusb20_tr_pending(xfer)) {
+		/* there is already a transfer ongoing */
+		return (-1);
+	}
+	maxsize = libusb20_tr_get_max_total_length(xfer);
+	oldbytes = bytes;
+
+	/*
+	 * We allow transferring zero bytes which is the same
+	 * equivalent to a zero length USB packet.
+	 */
+	do {
+
+		temp = size;
+		if (temp > maxsize) {
+			/* find maximum possible length */
+			temp = maxsize;
+		}
+		if (is_intr)
+			libusb20_tr_setup_intr(xfer, bytes, temp, timeout);
+		else
+			libusb20_tr_setup_bulk(xfer, bytes, temp, timeout);
+
+		libusb20_tr_start(xfer);
+
+		while (1) {
+
+			if (libusb20_dev_process((void *)dev) != 0) {
+				/* device detached */
+				return (-1);
+			}
+			if (libusb20_tr_pending(xfer) == 0) {
+				/* transfer complete */
+				break;
+			}
+			/* wait for USB event from kernel */
+			libusb20_dev_wait_process((void *)dev, -1);
+		}
+
+		switch (libusb20_tr_get_status(xfer)) {
+		case 0:
+			/* success */
+			break;
+		case LIBUSB20_TRANSFER_TIMED_OUT:
+			/* transfer timeout */
+			return (-ETIMEDOUT);
+		default:
+			/* other transfer error */
+			return (-ENXIO);
+		}
+		actlen = libusb20_tr_get_actual_length(xfer);
+
+		bytes += actlen;
+		size -= actlen;
+
+		if (actlen != temp) {
+			/* short transfer */
+			break;
+		}
+	} while (size > 0);
+
+	return (bytes - oldbytes);
+}
+
+int
+usb_bulk_write(usb_dev_handle * dev, int ep, char *bytes,
+    int size, int timeout)
+{
+	return (usb_std_io(dev, ep & ~USB_ENDPOINT_DIR_MASK,
+	    bytes, size, timeout, 0));
+}
+
+int
+usb_bulk_read(usb_dev_handle * dev, int ep, char *bytes,
+    int size, int timeout)
+{
+	return (usb_std_io(dev, ep | USB_ENDPOINT_DIR_MASK,
+	    bytes, size, timeout, 0));
+}
+
+int
+usb_interrupt_write(usb_dev_handle * dev, int ep, char *bytes,
+    int size, int timeout)
+{
+	return (usb_std_io(dev, ep & ~USB_ENDPOINT_DIR_MASK,
+	    bytes, size, timeout, 1));
+}
+
+int
+usb_interrupt_read(usb_dev_handle * dev, int ep, char *bytes,
+    int size, int timeout)
+{
+	return (usb_std_io(dev, ep | USB_ENDPOINT_DIR_MASK,
+	    bytes, size, timeout, 1));
+}
+
+int
+usb_control_msg(usb_dev_handle * dev, int requesttype, int request,
+    int value, int wIndex, char *bytes, int size, int timeout)
+{
+	struct LIBUSB20_CONTROL_SETUP_DECODED req;
+	int err;
+	uint16_t actlen;
+
+	LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
+
+	req.bmRequestType = requesttype;
+	req.bRequest = request;
+	req.wValue = value;
+	req.wIndex = wIndex;
+	req.wLength = size;
+
+	err = libusb20_dev_request_sync((void *)dev, &req, bytes,
+	    &actlen, timeout, 0);
+
+	if (err)
+		return (-1);
+
+	return (actlen);
+}
+
+int
+usb_set_configuration(usb_dev_handle * udev, int bConfigurationValue)
+{
+	struct usb_device *dev;
+	int err;
+	uint8_t i;
+
+	/*
+	 * Need to translate from "bConfigurationValue" to
+	 * configuration index:
+	 */
+
+	if (bConfigurationValue == 0) {
+		/* unconfigure */
+		i = 255;
+	} else {
+		/* lookup configuration index */
+		dev = usb_device(udev);
+
+		/* check if the configuration array is not there */
+		if (dev->config == NULL) {
+			return (-1);
+		}
+		for (i = 0;; i++) {
+			if (i == dev->descriptor.bNumConfigurations) {
+				/* "bConfigurationValue" not found */
+				return (-1);
+			}
+			if ((dev->config + i)->bConfigurationValue ==
+			    bConfigurationValue) {
+				break;
+			}
+		}
+	}
+
+	err = libusb20_dev_set_config_index((void *)udev, i);
+
+	if (err)
+		return (-1);
+
+	return (0);
+}
+
+int
+usb_claim_interface(usb_dev_handle * dev, int interface)
+{
+	int err;
+
+	err = libusb20_dev_claim_interface((void *)dev, interface);
+
+	if (err)
+		return (-1);
+
+	return (0);
+}
+
+int
+usb_release_interface(usb_dev_handle * dev, int interface)
+{
+	int err;
+
+	err = libusb20_dev_release_interface((void *)dev, interface);
+
+	if (err)
+		return (-1);
+
+	return (0);
+}
+
+int
+usb_set_altinterface(usb_dev_handle * dev, int alternate)
+{
+	int err;
+	uint8_t iface;
+
+	iface = usb_get_first_claimed_interface(dev);
+
+	err = libusb20_dev_set_alt_index((void *)dev, iface, alternate);
+
+	if (err)
+		return (-1);
+
+	return (0);
+}
+
+int
+usb_resetep(usb_dev_handle * dev, unsigned int ep)
+{
+	/* emulate an endpoint reset through clear-STALL */
+	return (usb_clear_halt(dev, ep));
+}
+
+int
+usb_clear_halt(usb_dev_handle * dev, unsigned int ep)
+{
+	struct libusb20_transfer *xfer;
+
+	xfer = usb_get_transfer_by_ep_no(dev, ep);
+	if (xfer == NULL)
+		return (-1);
+
+	libusb20_tr_clear_stall_sync(xfer);
+
+	return (0);
+}
+
+int
+usb_reset(usb_dev_handle * dev)
+{
+	int err;
+
+	err = libusb20_dev_reset((void *)dev);
+
+	if (err)
+		return (-1);
+
+	return (0);
+}
+
+const char *
+usb_strerror(void)
+{
+	/* TODO */
+	return ("Unknown error");
+}
+
+void
+usb_init(void)
+{
+	/* nothing to do */
+	return;
+}
+
+void
+usb_set_debug(int level)
+{
+	/* use kernel UGEN debugging if you need to see what is going on */
+	return;
+}
+
+int
+usb_find_busses(void)
+{
+	usb_busses = &usb_global_bus;
+	return (0);
+}
+
+int
+usb_find_devices(void)
+{
+	struct libusb20_device *pdev;
+	struct usb_device *udev;
+	struct LIBUSB20_DEVICE_DESC_DECODED *ddesc;
+	int err;
+
+	/* cleanup after last device search */
+	/* close all opened devices, if any */
+
+	while ((pdev = libusb20_be_device_foreach(usb_backend, NULL))) {
+		udev = pdev->priv01Data;
+		libusb20_be_dequeue_device(usb_backend, pdev);
+		libusb20_dev_free(pdev);
+		if (udev != NULL) {
+			LIST_DEL(usb_global_bus.devices, udev);
+			free(udev);
+		}
+	}
+
+	/* free old USB backend, if any */
+
+	libusb20_be_free(usb_backend);
+
+	/* do a new backend device search */
+	usb_backend = libusb20_be_alloc_default();
+	if (usb_backend == NULL) {
+		return (-1);
+	}
+	/* iterate all devices */
+
+	pdev = NULL;
+	while ((pdev = libusb20_be_device_foreach(usb_backend, pdev))) {
+		udev = malloc(sizeof(*udev));
+		if (udev == NULL)
+			break;
+
+		memset(udev, 0, sizeof(*udev));
+
+		udev->bus = &usb_global_bus;
+
+		snprintf(udev->filename, sizeof(udev->filename),
+		    "/dev/ugen%u.%u",
+		    libusb20_dev_get_bus_number(pdev),
+		    libusb20_dev_get_address(pdev));
+
+		ddesc = libusb20_dev_get_device_desc(pdev);
+
+		udev->descriptor.bLength = sizeof(udev->descriptor);
+		udev->descriptor.bDescriptorType = ddesc->bDescriptorType;
+		udev->descriptor.bcdUSB = ddesc->bcdUSB;
+		udev->descriptor.bDeviceClass = ddesc->bDeviceClass;
+		udev->descriptor.bDeviceSubClass = ddesc->bDeviceSubClass;
+		udev->descriptor.bDeviceProtocol = ddesc->bDeviceProtocol;
+		udev->descriptor.bMaxPacketSize0 = ddesc->bMaxPacketSize0;
+		udev->descriptor.idVendor = ddesc->idVendor;
+		udev->descriptor.idProduct = ddesc->idProduct;
+		udev->descriptor.bcdDevice = ddesc->bcdDevice;
+		udev->descriptor.iManufacturer = ddesc->iManufacturer;
+		udev->descriptor.iProduct = ddesc->iProduct;
+		udev->descriptor.iSerialNumber = ddesc->iSerialNumber;
+		udev->descriptor.bNumConfigurations =
+		    ddesc->bNumConfigurations;
+		if (udev->descriptor.bNumConfigurations > USB_MAXCONFIG) {
+			/* truncate number of configurations */
+			udev->descriptor.bNumConfigurations = USB_MAXCONFIG;
+		}
+		/* link together the two structures */
+		udev->dev = pdev;
+		pdev->priv01Data = udev;
+
+		err = libusb20_dev_open(pdev, 0);
+		if (err == 0) {
+			/* XXX get all config descriptors by default */
+			usb_fetch_and_parse_descriptors((void *)pdev);
+			libusb20_dev_close(pdev);
+		}
+		LIST_ADD(usb_global_bus.devices, udev);
+	}
+
+	return (0);			/* success */
+}
+
+struct usb_device *
+usb_device(usb_dev_handle * dev)
+{
+	struct libusb20_device *pdev;
+
+	pdev = (void *)dev;
+
+	return (pdev->priv01Data);
+}
+
+struct usb_bus *
+usb_get_busses(void)
+{
+	return (usb_busses);
+}