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

directory name.

1 files changed, 1141 insertions, 0 deletions

diff --git a/lib/libusb/libusb20.c b/lib/libusb/libusb20.c
new file mode 100644
index 0000000..704480a
--- /dev/null
+++ b/lib/libusb/libusb20.c
@@ -0,0 +1,1141 @@
+/* $FreeBSD$ */
+/*-
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <poll.h>
+#include <ctype.h>
+#include <sys/queue.h>
+
+#include "libusb20.h"
+#include "libusb20_desc.h"
+#include "libusb20_int.h"
+
+static int
+dummy_int(void)
+{
+	return (LIBUSB20_ERROR_NOT_SUPPORTED);
+}
+
+static void
+dummy_void(void)
+{
+	return;
+}
+
+static void
+dummy_callback(struct libusb20_transfer *xfer)
+{
+	;				/* style fix */
+	switch (libusb20_tr_get_status(xfer)) {
+	case LIBUSB20_TRANSFER_START:
+		libusb20_tr_submit(xfer);
+		break;
+	default:
+		/* complete or error */
+		break;
+	}
+	return;
+}
+
+#define	dummy_get_config_desc_full (void *)dummy_int
+#define	dummy_get_config_index (void *)dummy_int
+#define	dummy_set_config_index (void *)dummy_int
+#define	dummy_claim_interface (void *)dummy_int
+#define	dummy_release_interface (void *)dummy_int
+#define	dummy_set_alt_index (void *)dummy_int
+#define	dummy_reset_device (void *)dummy_int
+#define	dummy_set_power_mode (void *)dummy_int
+#define	dummy_get_power_mode (void *)dummy_int
+#define	dummy_kernel_driver_active (void *)dummy_int
+#define	dummy_detach_kernel_driver (void *)dummy_int
+#define	dummy_do_request_sync (void *)dummy_int
+#define	dummy_tr_open (void *)dummy_int
+#define	dummy_tr_close (void *)dummy_int
+#define	dummy_tr_clear_stall_sync (void *)dummy_int
+#define	dummy_process (void *)dummy_int
+#define	dummy_dev_info (void *)dummy_int
+#define	dummy_dev_get_iface_driver (void *)dummy_int
+
+#define	dummy_tr_submit (void *)dummy_void
+#define	dummy_tr_cancel_async (void *)dummy_void
+
+static const struct libusb20_device_methods libusb20_dummy_methods = {
+	LIBUSB20_DEVICE(LIBUSB20_DECLARE, dummy)
+};
+
+void
+libusb20_tr_callback_wrapper(struct libusb20_transfer *xfer)
+{
+	;				/* style fix */
+
+repeat:
+
+	if (!xfer->is_pending) {
+		xfer->status = LIBUSB20_TRANSFER_START;
+	} else {
+		xfer->is_pending = 0;
+	}
+
+	xfer->callback(xfer);
+
+	if (xfer->is_restart) {
+		xfer->is_restart = 0;
+		goto repeat;
+	}
+	if (xfer->is_draining &&
+	    (!xfer->is_pending)) {
+		xfer->is_draining = 0;
+		xfer->status = LIBUSB20_TRANSFER_DRAINED;
+		xfer->callback(xfer);
+	}
+	return;
+}
+
+int
+libusb20_tr_close(struct libusb20_transfer *xfer)
+{
+	int error;
+
+	if (!xfer->is_opened) {
+		return (LIBUSB20_ERROR_OTHER);
+	}
+	error = xfer->pdev->methods->tr_close(xfer);
+
+	if (xfer->pLength) {
+		free(xfer->pLength);
+	}
+	if (xfer->ppBuffer) {
+		free(xfer->ppBuffer);
+	}
+	/* clear some fields */
+	xfer->is_opened = 0;
+	xfer->maxFrames = 0;
+	xfer->maxTotalLength = 0;
+	xfer->maxPacketLen = 0;
+	return (error);
+}
+
+int
+libusb20_tr_open(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
+    uint32_t MaxFrameCount, uint8_t ep_no)
+{
+	uint32_t size;
+	int error;
+
+	if (xfer->is_opened) {
+		return (LIBUSB20_ERROR_BUSY);
+	}
+	if (MaxFrameCount == 0) {
+		return (LIBUSB20_ERROR_INVALID_PARAM);
+	}
+	xfer->maxFrames = MaxFrameCount;
+
+	size = MaxFrameCount * sizeof(xfer->pLength[0]);
+	xfer->pLength = malloc(size);
+	if (xfer->pLength == NULL) {
+		return (LIBUSB20_ERROR_NO_MEM);
+	}
+	memset(xfer->pLength, 0, size);
+
+	size = MaxFrameCount * sizeof(xfer->ppBuffer[0]);
+	xfer->ppBuffer = malloc(size);
+	if (xfer->ppBuffer == NULL) {
+		free(xfer->pLength);
+		return (LIBUSB20_ERROR_NO_MEM);
+	}
+	memset(xfer->ppBuffer, 0, size);
+
+	error = xfer->pdev->methods->tr_open(xfer, MaxBufSize,
+	    MaxFrameCount, ep_no);
+
+	if (error) {
+		free(xfer->ppBuffer);
+		free(xfer->pLength);
+	} else {
+		xfer->is_opened = 1;
+	}
+	return (error);
+}
+
+struct libusb20_transfer *
+libusb20_tr_get_pointer(struct libusb20_device *pdev, uint16_t trIndex)
+{
+	if (trIndex >= pdev->nTransfer) {
+		return (NULL);
+	}
+	return (pdev->pTransfer + trIndex);
+}
+
+uint32_t
+libusb20_tr_get_actual_frames(struct libusb20_transfer *xfer)
+{
+	return (xfer->aFrames);
+}
+
+uint16_t
+libusb20_tr_get_time_complete(struct libusb20_transfer *xfer)
+{
+	return (xfer->timeComplete);
+}
+
+uint32_t
+libusb20_tr_get_actual_length(struct libusb20_transfer *xfer)
+{
+	uint32_t x;
+	uint32_t actlen = 0;
+
+	for (x = 0; x != xfer->aFrames; x++) {
+		actlen += xfer->pLength[x];
+	}
+	return (actlen);
+}
+
+uint32_t
+libusb20_tr_get_max_frames(struct libusb20_transfer *xfer)
+{
+	return (xfer->maxFrames);
+}
+
+uint32_t
+libusb20_tr_get_max_packet_length(struct libusb20_transfer *xfer)
+{
+	/*
+	 * Special Case NOTE: If the packet multiplier is non-zero for
+	 * High Speed USB, the value returned is equal to
+	 * "wMaxPacketSize * multiplier" !
+	 */
+	return (xfer->maxPacketLen);
+}
+
+uint32_t
+libusb20_tr_get_max_total_length(struct libusb20_transfer *xfer)
+{
+	return (xfer->maxTotalLength);
+}
+
+uint8_t
+libusb20_tr_get_status(struct libusb20_transfer *xfer)
+{
+	return (xfer->status);
+}
+
+uint8_t
+libusb20_tr_pending(struct libusb20_transfer *xfer)
+{
+	return (xfer->is_pending);
+}
+
+void   *
+libusb20_tr_get_priv_sc0(struct libusb20_transfer *xfer)
+{
+	return (xfer->priv_sc0);
+}
+
+void   *
+libusb20_tr_get_priv_sc1(struct libusb20_transfer *xfer)
+{
+	return (xfer->priv_sc1);
+}
+
+void
+libusb20_tr_stop(struct libusb20_transfer *xfer)
+{
+	if (!xfer->is_pending) {
+		/* transfer not pending */
+		return;
+	}
+	if (xfer->is_cancel) {
+		/* already cancelling */
+		return;
+	}
+	xfer->is_cancel = 1;		/* we are cancelling */
+
+	xfer->pdev->methods->tr_cancel_async(xfer);
+	return;
+}
+
+void
+libusb20_tr_drain(struct libusb20_transfer *xfer)
+{
+	/* make sure that we are cancelling */
+	libusb20_tr_stop(xfer);
+
+	if (xfer->is_pending) {
+		xfer->is_draining = 1;
+	}
+	return;
+}
+
+void
+libusb20_tr_clear_stall_sync(struct libusb20_transfer *xfer)
+{
+	xfer->pdev->methods->tr_clear_stall_sync(xfer);
+	return;
+}
+
+void
+libusb20_tr_set_buffer(struct libusb20_transfer *xfer, void *buffer, uint16_t frIndex)
+{
+	xfer->ppBuffer[frIndex] = buffer;
+	return;
+}
+
+void
+libusb20_tr_set_callback(struct libusb20_transfer *xfer, libusb20_tr_callback_t *cb)
+{
+	xfer->callback = cb;
+	return;
+}
+
+void
+libusb20_tr_set_flags(struct libusb20_transfer *xfer, uint8_t flags)
+{
+	xfer->flags = flags;
+	return;
+}
+
+void
+libusb20_tr_set_length(struct libusb20_transfer *xfer, uint32_t length, uint16_t frIndex)
+{
+	xfer->pLength[frIndex] = length;
+	return;
+}
+
+void
+libusb20_tr_set_priv_sc0(struct libusb20_transfer *xfer, void *sc0)
+{
+	xfer->priv_sc0 = sc0;
+	return;
+}
+
+void
+libusb20_tr_set_priv_sc1(struct libusb20_transfer *xfer, void *sc1)
+{
+	xfer->priv_sc1 = sc1;
+	return;
+}
+
+void
+libusb20_tr_set_timeout(struct libusb20_transfer *xfer, uint32_t timeout)
+{
+	xfer->timeout = timeout;
+	return;
+}
+
+void
+libusb20_tr_set_total_frames(struct libusb20_transfer *xfer, uint32_t nFrames)
+{
+	if (nFrames > xfer->maxFrames) {
+		/* should not happen */
+		nFrames = xfer->maxFrames;
+	}
+	xfer->nFrames = nFrames;
+	return;
+}
+
+void
+libusb20_tr_setup_bulk(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
+{
+	xfer->ppBuffer[0] = pBuf;
+	xfer->pLength[0] = length;
+	xfer->timeout = timeout;
+	xfer->nFrames = 1;
+	return;
+}
+
+void
+libusb20_tr_setup_control(struct libusb20_transfer *xfer, void *psetup, void *pBuf, uint32_t timeout)
+{
+	uint16_t len;
+
+	xfer->ppBuffer[0] = psetup;
+	xfer->pLength[0] = 8;		/* fixed */
+	xfer->timeout = timeout;
+
+	len = ((uint8_t *)psetup)[6] | (((uint8_t *)psetup)[7] << 8);
+
+	if (len != 0) {
+		xfer->nFrames = 2;
+		xfer->ppBuffer[1] = pBuf;
+		xfer->pLength[1] = len;
+	} else {
+		xfer->nFrames = 1;
+	}
+	return;
+}
+
+void
+libusb20_tr_setup_intr(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
+{
+	xfer->ppBuffer[0] = pBuf;
+	xfer->pLength[0] = length;
+	xfer->timeout = timeout;
+	xfer->nFrames = 1;
+	return;
+}
+
+void
+libusb20_tr_setup_isoc(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint16_t frIndex)
+{
+	if (frIndex >= xfer->maxFrames) {
+		/* should not happen */
+		return;
+	}
+	xfer->ppBuffer[frIndex] = pBuf;
+	xfer->pLength[frIndex] = length;
+	return;
+}
+
+void
+libusb20_tr_submit(struct libusb20_transfer *xfer)
+{
+	if (xfer->is_pending) {
+		/* should not happen */
+		return;
+	}
+	xfer->is_pending = 1;		/* we are pending */
+	xfer->is_cancel = 0;		/* not cancelling */
+	xfer->is_restart = 0;		/* not restarting */
+
+	xfer->pdev->methods->tr_submit(xfer);
+	return;
+}
+
+void
+libusb20_tr_start(struct libusb20_transfer *xfer)
+{
+	if (xfer->is_pending) {
+		if (xfer->is_cancel) {
+			/* cancelling - restart */
+			xfer->is_restart = 1;
+		}
+		/* transfer not pending */
+		return;
+	}
+	/* get into the callback */
+	libusb20_tr_callback_wrapper(xfer);
+	return;
+}
+
+/* USB device operations */
+
+int
+libusb20_dev_claim_interface(struct libusb20_device *pdev, uint8_t ifaceIndex)
+{
+	int error;
+
+	if (ifaceIndex >= 32) {
+		error = LIBUSB20_ERROR_INVALID_PARAM;
+	} else if (pdev->claimed_interfaces & (1 << ifaceIndex)) {
+		error = LIBUSB20_ERROR_NOT_FOUND;
+	} else {
+		error = pdev->methods->claim_interface(pdev, ifaceIndex);
+	}
+	if (!error) {
+		pdev->claimed_interfaces |= (1 << ifaceIndex);
+	}
+	return (error);
+}
+
+int
+libusb20_dev_close(struct libusb20_device *pdev)
+{
+	struct libusb20_transfer *xfer;
+	uint16_t x;
+	int error = 0;
+
+	if (!pdev->is_opened) {
+		return (LIBUSB20_ERROR_OTHER);
+	}
+	for (x = 0; x != pdev->nTransfer; x++) {
+		xfer = pdev->pTransfer + x;
+
+		libusb20_tr_drain(xfer);
+	}
+
+	if (pdev->pTransfer != NULL) {
+		free(pdev->pTransfer);
+		pdev->pTransfer = NULL;
+	}
+	error = pdev->beMethods->close_device(pdev);
+
+	pdev->methods = &libusb20_dummy_methods;
+
+	pdev->is_opened = 0;
+
+	pdev->claimed_interfaces = 0;
+
+	return (error);
+}
+
+int
+libusb20_dev_detach_kernel_driver(struct libusb20_device *pdev, uint8_t ifaceIndex)
+{
+	int error;
+
+	error = pdev->methods->detach_kernel_driver(pdev, ifaceIndex);
+	return (error);
+}
+
+struct LIBUSB20_DEVICE_DESC_DECODED *
+libusb20_dev_get_device_desc(struct libusb20_device *pdev)
+{
+	return (&(pdev->ddesc));
+}
+
+int
+libusb20_dev_get_fd(struct libusb20_device *pdev)
+{
+	return (pdev->file);
+}
+
+int
+libusb20_dev_kernel_driver_active(struct libusb20_device *pdev, uint8_t ifaceIndex)
+{
+	int error;
+
+	error = pdev->methods->kernel_driver_active(pdev, ifaceIndex);
+	return (error);
+}
+
+int
+libusb20_dev_open(struct libusb20_device *pdev, uint16_t nTransferMax)
+{
+	struct libusb20_transfer *xfer;
+	uint32_t size;
+	uint16_t x;
+	int error;
+
+	if (pdev->is_opened) {
+		return (LIBUSB20_ERROR_BUSY);
+	}
+	if (nTransferMax >= 256) {
+		return (LIBUSB20_ERROR_INVALID_PARAM);
+	} else if (nTransferMax != 0) {
+		size = sizeof(pdev->pTransfer[0]) * nTransferMax;
+		pdev->pTransfer = malloc(size);
+		if (pdev->pTransfer == NULL) {
+			return (LIBUSB20_ERROR_NO_MEM);
+		}
+		memset(pdev->pTransfer, 0, size);
+	}
+	/* initialise all transfers */
+	for (x = 0; x != nTransferMax; x++) {
+
+		xfer = pdev->pTransfer + x;
+
+		xfer->pdev = pdev;
+		xfer->trIndex = x;
+		xfer->callback = &dummy_callback;
+	}
+
+	/* set "nTransfer" early */
+	pdev->nTransfer = nTransferMax;
+
+	error = pdev->beMethods->open_device(pdev, nTransferMax);
+
+	if (error) {
+		if (pdev->pTransfer != NULL) {
+			free(pdev->pTransfer);
+			pdev->pTransfer = NULL;
+		}
+		pdev->file = -1;
+		pdev->file_ctrl = -1;
+		pdev->nTransfer = 0;
+	} else {
+		pdev->is_opened = 1;
+	}
+	return (error);
+}
+
+int
+libusb20_dev_release_interface(struct libusb20_device *pdev, uint8_t ifaceIndex)
+{
+	int error;
+
+	if (ifaceIndex >= 32) {
+		error = LIBUSB20_ERROR_INVALID_PARAM;
+	} else if (!(pdev->claimed_interfaces & (1 << ifaceIndex))) {
+		error = LIBUSB20_ERROR_NOT_FOUND;
+	} else {
+		error = pdev->methods->release_interface(pdev, ifaceIndex);
+	}
+	if (!error) {
+		pdev->claimed_interfaces &= ~(1 << ifaceIndex);
+	}
+	return (error);
+}
+
+int
+libusb20_dev_reset(struct libusb20_device *pdev)
+{
+	int error;
+
+	error = pdev->methods->reset_device(pdev);
+	return (error);
+}
+
+int
+libusb20_dev_set_power_mode(struct libusb20_device *pdev, uint8_t power_mode)
+{
+	int error;
+
+	error = pdev->methods->set_power_mode(pdev, power_mode);
+	return (error);
+}
+
+uint8_t
+libusb20_dev_get_power_mode(struct libusb20_device *pdev)
+{
+	int error;
+	uint8_t power_mode;
+
+	error = pdev->methods->get_power_mode(pdev, &power_mode);
+	if (error)
+		power_mode = LIBUSB20_POWER_ON;	/* fake power mode */
+	return (power_mode);
+}
+
+int
+libusb20_dev_set_alt_index(struct libusb20_device *pdev, uint8_t ifaceIndex, uint8_t altIndex)
+{
+	int error;
+
+	error = pdev->methods->set_alt_index(pdev, ifaceIndex, altIndex);
+	return (error);
+}
+
+int
+libusb20_dev_set_config_index(struct libusb20_device *pdev, uint8_t configIndex)
+{
+	int error;
+
+	error = pdev->methods->set_config_index(pdev, configIndex);
+	return (error);
+}
+
+int
+libusb20_dev_request_sync(struct libusb20_device *pdev,
+    struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data,
+    uint16_t *pactlen, uint32_t timeout, uint8_t flags)
+{
+	int error;
+
+	error = pdev->methods->do_request_sync(pdev,
+	    setup, data, pactlen, timeout, flags);
+	return (error);
+}
+
+int
+libusb20_dev_req_string_sync(struct libusb20_device *pdev,
+    uint8_t str_index, uint16_t langid, void *ptr, uint16_t len)
+{
+	struct LIBUSB20_CONTROL_SETUP_DECODED req;
+	int error;
+
+	if (len < 4) {
+		/* invalid length */
+		return (LIBUSB20_ERROR_INVALID_PARAM);
+	}
+	LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
+
+	/*
+	 * We need to read the USB string in two steps else some USB
+	 * devices will complain.
+	 */
+	req.bmRequestType =
+	    LIBUSB20_REQUEST_TYPE_STANDARD |
+	    LIBUSB20_RECIPIENT_DEVICE |
+	    LIBUSB20_ENDPOINT_IN;
+	req.bRequest = LIBUSB20_REQUEST_GET_DESCRIPTOR;
+	req.wValue = (LIBUSB20_DT_STRING << 8) | str_index;
+	req.wIndex = langid;
+	req.wLength = 4;		/* bytes */
+
+	error = libusb20_dev_request_sync(pdev, &req,
+	    ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
+	if (error) {
+		return (error);
+	}
+	req.wLength = *(uint8_t *)ptr;	/* bytes */
+	if (req.wLength > len) {
+		/* partial string read */
+		req.wLength = len;
+	}
+	error = libusb20_dev_request_sync(pdev, &req,
+	    ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
+
+	if (error) {
+		return (error);
+	}
+	if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) {
+		return (LIBUSB20_ERROR_OTHER);
+	}
+	return (0);			/* success */
+}
+
+int
+libusb20_dev_req_string_simple_sync(struct libusb20_device *pdev,
+    uint8_t str_index, void *ptr, uint16_t len)
+{
+	char *buf;
+	int error;
+	uint16_t langid;
+	uint16_t n;
+	uint16_t i;
+	uint16_t c;
+	uint8_t temp[255];
+	uint8_t swap;
+
+	/* the following code derives from the FreeBSD USB kernel */
+
+	if ((len < 1) || (ptr == NULL)) {
+		/* too short buffer */
+		return (LIBUSB20_ERROR_INVALID_PARAM);
+	}
+	error = libusb20_dev_req_string_sync(pdev,
+	    0, 0, temp, sizeof(temp));
+	if (error < 0) {
+		*(uint8_t *)ptr = 0;	/* zero terminate */
+		return (error);
+	}
+	langid = temp[2] | (temp[3] << 8);
+
+	error = libusb20_dev_req_string_sync(pdev, str_index,
+	    langid, temp, sizeof(temp));
+	if (error < 0) {
+		*(uint8_t *)ptr = 0;	/* zero terminate */
+		return (error);
+	}
+	if (temp[0] < 2) {
+		/* string length is too short */
+		*(uint8_t *)ptr = 0;	/* zero terminate */
+		return (LIBUSB20_ERROR_OTHER);
+	}
+	/* reserve one byte for terminating zero */
+	len--;
+
+	/* find maximum length */
+	n = (temp[0] / 2) - 1;
+	if (n > len) {
+		n = len;
+	}
+	/* reset swap state */
+	swap = 3;
+
+	/* setup output buffer pointer */
+	buf = ptr;
+
+	/* convert and filter */
+	for (i = 0; (i != n); i++) {
+		c = temp[(2 * i) + 2] | (temp[(2 * i) + 3] << 8);
+
+		/* convert from Unicode, handle buggy strings */
+		if (((c & 0xff00) == 0) && (swap & 1)) {
+			/* Little Endian, default */
+			*buf = c;
+			swap = 1;
+		} else if (((c & 0x00ff) == 0) && (swap & 2)) {
+			/* Big Endian */
+			*buf = c >> 8;
+			swap = 2;
+		} else {
+			/* skip invalid character */
+			continue;
+		}
+		/*
+		 * Filter by default - we don't allow greater and less than
+		 * signs because they might confuse the dmesg printouts!
+		 */
+		if ((*buf == '<') || (*buf == '>') || (!isprint(*buf))) {
+			/* skip invalid character */
+			continue;
+		}
+		buf++;
+	}
+	*buf = 0;			/* zero terminate string */
+
+	return (0);
+}
+
+struct libusb20_config *
+libusb20_dev_alloc_config(struct libusb20_device *pdev, uint8_t configIndex)
+{
+	struct libusb20_config *retval = NULL;
+	uint8_t *ptr;
+	uint16_t len;
+	uint8_t do_close;
+	int error;
+
+	if (!pdev->is_opened) {
+		error = libusb20_dev_open(pdev, 0);
+		if (error) {
+			return (NULL);
+		}
+		do_close = 1;
+	} else {
+		do_close = 0;
+	}
+	error = pdev->methods->get_config_desc_full(pdev,
+	    &ptr, &len, configIndex);
+
+	if (error) {
+		goto done;
+	}
+	/* parse new config descriptor */
+	retval = libusb20_parse_config_desc(ptr);
+
+	/* free config descriptor */
+	free(ptr);
+
+done:
+	if (do_close) {
+		error = libusb20_dev_close(pdev);
+	}
+	return (retval);
+}
+
+struct libusb20_device *
+libusb20_dev_alloc(void)
+{
+	struct libusb20_device *pdev;
+
+	pdev = malloc(sizeof(*pdev));
+	if (pdev == NULL) {
+		return (NULL);
+	}
+	memset(pdev, 0, sizeof(*pdev));
+
+	pdev->file = -1;
+	pdev->file_ctrl = -1;
+	pdev->methods = &libusb20_dummy_methods;
+	return (pdev);
+}
+
+uint8_t
+libusb20_dev_get_config_index(struct libusb20_device *pdev)
+{
+	int error;
+	uint8_t cfg_index;
+	uint8_t do_close;
+
+	if (!pdev->is_opened) {
+		error = libusb20_dev_open(pdev, 0);
+		if (error == 0) {
+			do_close = 1;
+		} else {
+			do_close = 0;
+		}
+	} else {
+		do_close = 0;
+	}
+
+	error = pdev->methods->get_config_index(pdev, &cfg_index);
+	if (error) {
+		cfg_index = 0 - 1;	/* current config index */
+	}
+	if (do_close) {
+		if (libusb20_dev_close(pdev)) {
+			/* ignore */
+		}
+	}
+	return (cfg_index);
+}
+
+uint8_t
+libusb20_dev_get_mode(struct libusb20_device *pdev)
+{
+	return (pdev->usb_mode);
+}
+
+uint8_t
+libusb20_dev_get_speed(struct libusb20_device *pdev)
+{
+	return (pdev->usb_speed);
+}
+
+/* if this function returns an error, the device is gone */
+int
+libusb20_dev_process(struct libusb20_device *pdev)
+{
+	int error;
+
+	error = pdev->methods->process(pdev);
+	return (error);
+}
+
+void
+libusb20_dev_wait_process(struct libusb20_device *pdev, int timeout)
+{
+	struct pollfd pfd[1];
+
+	if (!pdev->is_opened) {
+		return;
+	}
+	pfd[0].fd = pdev->file;
+	pfd[0].events = (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM);
+	pfd[0].revents = 0;
+
+	if (poll(pfd, 1, timeout)) {
+		/* ignore any error */
+	}
+	return;
+}
+
+void
+libusb20_dev_free(struct libusb20_device *pdev)
+{
+	if (pdev == NULL) {
+		/* be NULL safe */
+		return;
+	}
+	if (pdev->is_opened) {
+		if (libusb20_dev_close(pdev)) {
+			/* ignore any errors */
+		}
+	}
+	free(pdev);
+	return;
+}
+
+int
+libusb20_dev_get_info(struct libusb20_device *pdev,
+    struct usb2_device_info *pinfo)
+{
+	if (pinfo == NULL)
+		return (LIBUSB20_ERROR_INVALID_PARAM);
+
+	return (pdev->beMethods->dev_get_info(pdev, pinfo));
+}
+
+const char *
+libusb20_dev_get_backend_name(struct libusb20_device *pdev)
+{
+	return (pdev->beMethods->get_backend_name());
+}
+
+const char *
+libusb20_dev_get_desc(struct libusb20_device *pdev)
+{
+	return (pdev->usb_desc);
+}
+
+void
+libusb20_dev_set_debug(struct libusb20_device *pdev, int debug)
+{
+	pdev->debug = debug;
+	return;
+}
+
+int
+libusb20_dev_get_debug(struct libusb20_device *pdev)
+{
+	return (pdev->debug);
+}
+
+uint8_t
+libusb20_dev_get_address(struct libusb20_device *pdev)
+{
+	return (pdev->device_address);
+}
+
+uint8_t
+libusb20_dev_get_bus_number(struct libusb20_device *pdev)
+{
+	return (pdev->bus_number);
+}
+
+int
+libusb20_dev_get_iface_desc(struct libusb20_device *pdev, 
+    uint8_t iface_index, char *buf, uint8_t len)
+{
+	if ((buf == NULL) || (len == 0))
+		return (LIBUSB20_ERROR_INVALID_PARAM);
+
+	return (pdev->beMethods->dev_get_iface_desc(
+	    pdev, iface_index, buf, len));
+}
+
+/* USB backend operations */
+
+int
+libusb20_be_get_dev_quirk(struct libusb20_backend *pbe,
+    uint16_t quirk_index, struct libusb20_quirk *pq)
+{
+	return (pbe->methods->root_get_dev_quirk(pbe, quirk_index, pq));
+}
+
+int
+libusb20_be_get_quirk_name(struct libusb20_backend *pbe,
+    uint16_t quirk_index, struct libusb20_quirk *pq)
+{
+	return (pbe->methods->root_get_quirk_name(pbe, quirk_index, pq));
+}
+
+int
+libusb20_be_add_dev_quirk(struct libusb20_backend *pbe,
+    struct libusb20_quirk *pq)
+{
+	return (pbe->methods->root_add_dev_quirk(pbe, pq));
+}
+
+int
+libusb20_be_remove_dev_quirk(struct libusb20_backend *pbe,
+    struct libusb20_quirk *pq)
+{
+	return (pbe->methods->root_remove_dev_quirk(pbe, pq));
+}
+
+int
+libusb20_be_set_template(struct libusb20_backend *pbe, int temp)
+{
+	return (pbe->methods->root_set_template(pbe, temp));
+}
+
+int
+libusb20_be_get_template(struct libusb20_backend *pbe, int *ptemp)
+{
+	int temp;
+
+	if (ptemp == NULL)
+		ptemp = &temp;
+
+	return (pbe->methods->root_get_template(pbe, ptemp));
+}
+
+struct libusb20_device *
+libusb20_be_device_foreach(struct libusb20_backend *pbe, struct libusb20_device *pdev)
+{
+	if (pbe == NULL) {
+		pdev = NULL;
+	} else if (pdev == NULL) {
+		pdev = TAILQ_FIRST(&(pbe->usb_devs));
+	} else {
+		pdev = TAILQ_NEXT(pdev, dev_entry);
+	}
+	return (pdev);
+}
+
+struct libusb20_backend *
+libusb20_be_alloc(const struct libusb20_backend_methods *methods)
+{
+	struct libusb20_backend *pbe;
+
+	pbe = malloc(sizeof(*pbe));
+	if (pbe == NULL) {
+		return (NULL);
+	}
+	memset(pbe, 0, sizeof(*pbe));
+
+	TAILQ_INIT(&(pbe->usb_devs));
+
+	pbe->methods = methods;		/* set backend methods */
+
+	/* do the initial device scan */
+	if (pbe->methods->init_backend) {
+		pbe->methods->init_backend(pbe);
+	}
+	return (pbe);
+}
+
+struct libusb20_backend *
+libusb20_be_alloc_linux(void)
+{
+	struct libusb20_backend *pbe;
+
+#ifdef __linux__
+	pbe = libusb20_be_alloc(&libusb20_linux_backend);
+#else
+	pbe = NULL;
+#endif
+	return (pbe);
+}
+
+struct libusb20_backend *
+libusb20_be_alloc_ugen20(void)
+{
+	struct libusb20_backend *pbe;
+
+#ifdef __FreeBSD__
+	pbe = libusb20_be_alloc(&libusb20_ugen20_backend);
+#else
+	pbe = NULL;
+#endif
+	return (pbe);
+}
+
+struct libusb20_backend *
+libusb20_be_alloc_default(void)
+{
+	struct libusb20_backend *pbe;
+
+	pbe = libusb20_be_alloc_linux();
+	if (pbe) {
+		return (pbe);
+	}
+	pbe = libusb20_be_alloc_ugen20();
+	if (pbe) {
+		return (pbe);
+	}
+	return (NULL);			/* no backend found */
+}
+
+void
+libusb20_be_free(struct libusb20_backend *pbe)
+{
+	struct libusb20_device *pdev;
+
+	if (pbe == NULL) {
+		/* be NULL safe */
+		return;
+	}
+	while ((pdev = libusb20_be_device_foreach(pbe, NULL))) {
+		libusb20_be_dequeue_device(pbe, pdev);
+		libusb20_dev_free(pdev);
+	}
+	if (pbe->methods->exit_backend) {
+		pbe->methods->exit_backend(pbe);
+	}
+	return;
+}
+
+void
+libusb20_be_enqueue_device(struct libusb20_backend *pbe, struct libusb20_device *pdev)
+{
+	pdev->beMethods = pbe->methods;	/* copy backend methods */
+	TAILQ_INSERT_TAIL(&(pbe->usb_devs), pdev, dev_entry);
+	return;
+}
+
+void
+libusb20_be_dequeue_device(struct libusb20_backend *pbe,
+    struct libusb20_device *pdev)
+{
+	TAILQ_REMOVE(&(pbe->usb_devs), pdev, dev_entry);
+	return;
+}