Add libusb 1.0 support which is compatible with the latest revision on

Sourceforge. Libusb 1.0 is a portable usb api released December 2008 and
supersedes the original libusb released 10 years ago, it supports isochronous
endpoints and asynchronous I/O.  Many applications have already started using
the interfaces.

This has been developed as part of Google Summer of Code this year by Sylvestre
Gallon and has been cribbed early due to it being desirable in FreeBSD 8.0

Submitted by:	Sylvestre Gallon
Sponsored by:	Google Summer of Code 2009
Reviewed by:	Hans Petter Selasky

5 files changed, 1227 insertions, 799 deletions

diff --git a/lib/libusb/Makefile b/lib/libusb/Makefile
index 83a5448..1ee56fe 100644
--- a/lib/libusb/Makefile
+++ b/lib/libusb/Makefile
@@ -10,19 +10,23 @@ SHLIB_MINOR=	0
 SRCS=		libusb20.c
 SRCS+=		libusb20_desc.c
 SRCS+=		libusb20_ugen20.c
-SRCS+=		libusb20_compat01.c
-SRCS+=		libusb20_compat10.c
 INCS+=		libusb20.h
 INCS+=		libusb20_desc.h
-MAN=		libusb.3
+MAN=		libusb.3 libusb20.3
 MKLINT=		no
 NOGCCERROR=
 
-MLINKS+=	libusb.3 usb.3 \
-		libusb.3 libusb20.3
+MLINKS+=	libusb.3 usb.3
 
 # libusb 0.1 compat
 INCS+=		usb.h
+SRCS+=		libusb20_compat01.c
+
+# libusb 1.0 compat
+INCS+=		libusb.h
+SRCS+=		libusb10.c
+SRCS+=		libusb10_desc.c
+SRCS+=		libusb10_io.c
 
 .include <bsd.lib.mk>
 
diff --git a/lib/libusb/libusb.3 b/lib/libusb/libusb.3
index 8a0315e..c19a13c 100644
--- a/lib/libusb/libusb.3
+++ b/lib/libusb/libusb.3
@@ -1,5 +1,5 @@
 .\"
-.\" Copyright (c) 2008 Hans Petter Selasky
+.\" Copyright (c) 2009 Sylvestre Gallon
 .\"
 .\" All rights reserved.
 .\"
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 28, 2009
+.Dd June 22, 2009
 .Dt LIBUSB 3
 .Os
 .Sh NAME
@@ -41,882 +41,424 @@
 USB access library (libusb -lusb)
 .
 .
-.
 .Sh SYNOPSIS
-.In libusb20.h
-.Ft int
-.Fn libusb20_tr_close "struct libusb20_transfer *xfer"
-.Ft int
-.Fn libusb20_tr_open "struct libusb20_transfer *xfer" "uint32_t max_buf_size" "uint32_t max_frame_count" "uint8_t ep_no"
-.Ft struct libusb20_transfer*
-.Fn libusb20_tr_get_pointer "struct libusb20_device *pdev"  "uint16_t tr_index"
-.Ft uint16_t
-.Fn libusb20_tr_get_time_complete "struct libusb20_transfer *xfer"
-.Ft uint32_t
-.Fn libusb20_tr_get_actual_frames "struct libusb20_transfer *xfer"
-.Ft uint32_t
-.Fn libusb20_tr_get_actual_length "struct libusb20_transfer *xfer"
-.Ft uint32_t
-.Fn libusb20_tr_get_max_frames "struct libusb20_transfer *xfer"
-.Ft uint32_t
-.Fn libusb20_tr_get_max_packet_length "struct libusb20_transfer *xfer"
-.Ft uint32_t
-.Fn libusb20_tr_get_max_total_length "struct libusb20_transfer *xfer"
-.Ft uint8_t
-.Fn libusb20_tr_get_status "struct libusb20_transfer *xfer"
-.Ft uint8_t
-.Fn libusb20_tr_pending "struct libusb20_transfer *xfer"
-.Ft void
-.Fn libusb20_tr_callback_wrapper "struct libusb20_transfer *xfer"
-.Ft void
-.Fn libusb20_tr_clear_stall_sync "struct libusb20_transfer *xfer"
-.Ft void
-.Fn libusb20_tr_drain "struct libusb20_transfer *xfer"
-.Ft void
-.Fn libusb20_tr_set_buffer "struct libusb20_transfer *xfer" "void *buffer" "uint16_t fr_index"
-.Ft void
-.Fn libusb20_tr_set_callback "struct libusb20_transfer *xfer" "libusb20_tr_callback_t *cb"
-.Ft void
-.Fn libusb20_tr_set_flags "struct libusb20_transfer *xfer" "uint8_t flags"
-.Ft uint32_t
-.Fn libusb20_tr_get_length "struct libusb20_transfer *xfer" "uint16_t fr_index"
-.Ft void
-.Fn libusb20_tr_set_length "struct libusb20_transfer *xfer" "uint32_t length" "uint16_t fr_index"
-.Ft void
-.Fn libusb20_tr_set_priv_sc0 "struct libusb20_transfer *xfer" "void *sc0"
-.Ft void
-.Fn libusb20_tr_set_priv_sc1 "struct libusb20_transfer *xfer" "void *sc1"
-.Ft void
-.Fn libusb20_tr_set_timeout "struct libusb20_transfer *xfer" "uint32_t timeout"
-.Ft void
-.Fn libusb20_tr_set_total_frames "struct libusb20_transfer *xfer" "uint32_t nframes"
-.Ft void
-.Fn libusb20_tr_setup_bulk "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t timeout"
-.Ft void
-.Fn libusb20_tr_setup_control "struct libusb20_transfer *xfer" "void *psetup" "void *pbuf" "uint32_t timeout"
-.Ft void
-.Fn libusb20_tr_setup_intr "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t timeout"
-.Ft void
-.Fn libusb20_tr_setup_isoc "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint61_t fr_index"
-.Ft void
-.Fn libusb20_tr_start "struct libusb20_transfer *xfer"
-.Ft void
-.Fn libusb20_tr_stop "struct libusb20_transfer *xfer"
-.Ft void
-.Fn libusb20_tr_submit "struct libusb20_transfer *xfer"
-.Ft void *
-.Fn libusb20_tr_get_priv_sc0 "struct libusb20_transfer *xfer"
-.Ft void *
-.Fn libusb20_tr_get_priv_sc1 "struct libusb20_transfer *xfer"
-.Ft const char *
-.Fn libusb20_dev_get_backend_name "struct libusb20_device *"
-.Ft int
-.Fn libusb20_dev_get_info "struct libusb20_device *pdev" "struct usb_device_info *pinfo"
-.Ft int
-.Fn libusb20_dev_get_iface_desc "struct libusb20_device *pdev" "uint8_t iface_index" "char *buf" "uint8_t len"
-.Ft const char *
-.Fn libusb20_dev_get_desc "struct libusb20_device *pdev"
-.Ft int
-.Fn libusb20_dev_close "struct libusb20_device *pdev"
-.Ft int
-.Fn libusb20_dev_detach_kernel_driver "struct libusb20_device *pdev" "uint8_t iface_index"
-.Ft int
-.Fn libusb20_dev_set_config_index "struct libusb20_device *pdev" "uint8_t configIndex"
-.Ft int
-.Fn libusb20_dev_get_debug "struct libusb20_device *pdev"
-.Ft int
-.Fn libusb20_dev_get_fd "struct libusb20_device *pdev"
-.Ft int
-.Fn libusb20_dev_kernel_driver_active "struct libusb20_device *pdev" "uint8_t iface_index"
-.Ft int
-.Fn libusb20_dev_open "struct libusb20_device *pdev" "uint16_t transfer_max"
-.Ft int
-.Fn libusb20_dev_process "struct libusb20_device *pdev"
-.Ft int
-.Fn 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"
-.Ft int
-.Fn libusb20_dev_req_string_sync "struct libusb20_device *pdev" "uint8_t index" "uint16_t langid" "void *ptr" "uint16_t len"
-.Ft int
-.Fn libusb20_dev_req_string_simple_sync "struct libusb20_device *pdev" "uint8_t index" "void *ptr" "uint16_t len"
-.Ft int
-.Fn libusb20_dev_reset "struct libusb20_device *pdev"
-.Ft int
-.Fn libusb20_dev_set_power_mode "struct libusb20_device *pdev" "uint8_t power_mode"
-.Ft uint8_t
-.Fn libusb20_dev_get_power_mode "struct libusb20_device *pdev"
-.Ft int
-.Fn libusb20_dev_set_alt_index "struct libusb20_device *pdev" "uint8_t iface_index" "uint8_t alt_index"
-.Ft struct LIBUSB20_DEVICE_DESC_DECODED *
-.Fn libusb20_dev_get_device_desc "struct libusb20_device *pdev"
-.Ft struct libusb20_config *
-.Fn libusb20_dev_alloc_config "struct libusb20_device *pdev" "uint8_t config_index"
-.Ft struct libusb20_device *
-.Fn libusb20_dev_alloc "void"
-.Ft uint8_t
-.Fn libusb20_dev_get_address "struct libusb20_device *pdev"
-.Ft uint8_t
-.Fn libusb20_dev_get_bus_number "struct libusb20_device *pdev"
-.Ft uint8_t
-.Fn libusb20_dev_get_mode "struct libusb20_device *pdev"
-.Ft uint8_t
-.Fn libusb20_dev_get_speed "struct libusb20_device *pdev"
-.Ft uint8_t
-.Fn libusb20_dev_get_config_index "struct libusb20_device *pdev"
-.Ft void
-.Fn libusb20_dev_free "struct libusb20_device *pdev"
-.Ft void
-.Fn libusb20_dev_set_debug "struct libusb20_device *pdev" "int debug"
-.Ft void
-.Fn libusb20_dev_wait_process "struct libusb20_device *pdev" "int timeout"
-.Ft int
-.Fn libusb20_be_get_template "struct libusb20_backend *pbe" "int *ptemp"
-.Ft int
-.Fn libusb20_be_set_template "struct libusb20_backend *pbe" "int temp"
-.Ft int
-.Fn libusb20_be_get_dev_quirk "struct libusb20_backend *pber", "uint16_t index" "struct libusb20_quirk *pq"
-.Ft int
-.Fn libusb20_be_get_quirk_name "struct libusb20_backend *pbe" "uint16_t index" "struct libusb20_quirk *pq"
-.Ft int
-.Fn libusb20_be_add_dev_quirk "struct libusb20_backend *pbe" "struct libusb20_quirk *pq"
-.Ft int
-.Fn libusb20_be_remove_dev_quirk "struct libusb20_backend *pbe" "struct libusb20_quirk *pq"
-.Ft struct libusb20_backend *
-.Fn libusb20_be_alloc_default "void"
-.Ft struct libusb20_backend *
-.Fn libusb20_be_alloc_freebsd "void"
-.Ft struct libusb20_backend *
-.Fn libusb20_be_alloc_linux "void"
-.Ft struct libusb20_device *
-.Fn libusb20_be_device_foreach  "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
-.Ft void
-.Fn libusb20_be_dequeue_device "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
-.Ft void
-.Fn libusb20_be_enqueue_device "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
-.Ft void
-.Fn libusb20_be_free "struct libusb20_backend *pbe"
-.Ft uint8_t
-.Fn libusb20_me_get_1 "const struct libusb20_me_struct *me" "uint16_t off"
-.Ft uint16_t
-.Fn libusb20_me_get_2 "const struct libusb20_me_struct *me" "uint16_t off"
-.Ft uint16_t
-.Fn libusb20_me_encode "void *pdata" "uint16_t len" "const void *pdecoded"
-.Ft uint16_t
-.Fn libusb20_me_decode "const void *pdata" "uint16_t len" "void *pdecoded"
-.Ft "const uint8_t *"
-.Fn libusb20_desc_foreach "const struct libusb20_me_struct *me" "const uint8_t *pdesc"
-.
-.
-.Sh DESCRIPTION
-.
-The
-.Nm
-library implements functions to be able to easily access and control
-USB through the USB file system interface.
-.
-.
-.Sh USB TRANSFER OPERATIONS
-.
-.Pp
 .
-.Fn libusb20_tr_close
-will release all kernel resources associated with an USB
-.Fa xfer .
 .
-This function returns zero upon success.
+.In libusb.h
 .
-Non-zero return values indicate a LIBUSB20_ERROR value.
 .
-.Pp
-.
-.Fn libusb20_tr_open
-will allocate kernel buffer resources according to
-.Fa max_buf_size
-and
-.Fa max_frame_count
-associated with an USB
-.Fa pxfer
-and bind the transfer to the specified
-.Fa ep_no .
-.Fa max_buf_size
-is the minimum buffer size which the data transport layer has to support.
-If
-.Fa max_buf_size
-is zero, the
+.Sh DESCRIPTION
+The
 .Nm
-library will use wMaxPacketSize to compute the buffer size.
-This can be useful for isochronous transfers.
-The actual buffer size can be greater than
-.Fa max_buf_size
-and is returned by
-.Fn libusb20_tr_get_max_total_length .
-.
-This function returns zero upon success.
-.
-Non-zero return values indicate a LIBUSB20_ERROR value.
-.
-.Pp
-.
-.Fn libusb20_tr_get_pointer
-will return a pointer to the allocated USB transfer according to the
-.Fa pdev
-and
-.Fa tr_index
-arguments.
-.
-This function returns NULL in case of failure.
-.
-.Pp
-.
-.Fn libusb20_tr_get_time_complete
-will return the completion time of an USB transfer in
-millisecond units. This function is most useful for isochronous USB
-transfers when doing echo cancelling.
-.
-.Pp
-.
-.Fn libusb20_tr_get_actual_frames
-will return the actual number of USB frames after an USB
-transfer completed. A value of zero means that no data was transferred.
-.
-.Pp
-.
-.Fn libusb20_tr_get_actual_length
-will return the sum of the actual length for all
-transferred USB frames for the given USB transfer.
-.
-.Pp
-.
-.Fn libusb20_tr_get_max_frames
-will return the maximum number of USB frames that were
-allocated when an USB transfer was setup for the given USB transfer.
-.
-.Pp
-.
-.Fn libusb20_tr_get_max_packet_length
-will return the maximum packet length in bytes
-associated with the given USB transfer.
-.
-The packet length can be used round up buffer sizes so that short USB
-packets are avoided for proxy buffers.
-.
-.
-.Pp
-.
-.Fn libusb20_tr_get_max_total_length
-function will return the maximum value for the length sum of all
-USB frames associated with an USB transfer.
-.
-.Pp
-.
-.Fn libusb20_tr_get_status
-will return the status of an USB transfer.
-.
-Status values are defined by a set of LIBUSB20_TRANSFER_XXX enums.
+library contains interfaces for directly managing a usb device.
+The current implementation supports v1.0 of the libusb API.
 .
-.Pp
-.
-.Fn libusb20_tr_pending
-will return non-zero if the given USB transfer is
-pending for completion.
-.
-Else this function returns zero.
-.
-.Pp
-.
-.Fn libusb20_tr_callback_wrapper
-This is an internal function used to wrap asynchronous USB callbacks.
-.
-.Pp
-.
-.Fn libusb20_tr_clear_stall_sync
-This is an internal function used to synchronously clear the stall on
-the given USB transfer.
-.
-Please see the USB specification for more information on stall
-clearing.
-.
-If the given USB transfer is pending when this function is called, the
-USB transfer will complete with an error after that this function has
-been called.
-.
-.Pp
-.
-.Fn libusb20_tr_drain
-will stop the given USB transfer and will not return
-until the USB transfer has been stopped in hardware.
-.
-.Pp
-.
-.Fn libusb20_tr_set_buffer
-is used to set the
-.Fa buffer
-pointer for the given USB transfer and
-.Fa fr_index .
 .
-Typically the frame index is zero.
-.
-.
-.Pp
-.
-.Fn libusb20_tr_set_callback
-is used to set the USB callback for asynchronous USB
-transfers.
-.
-The callback type is defined by libusb20_tr_callback_t.
+.Sh LIBRARY INITIALISATION / DEINITIALISATION
 .
 .Pp
 .
-.Fn libusb20_tr_set_flags
-is used to set various USB flags for the given USB transfer.
-.Bl -tag
-.It LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK
-Report a short frame as error.
-.It LIBUSB20_TRANSFER_MULTI_SHORT_NOT_OK
-Multiple short frames are not allowed.
-.It LIBUSB20_TRANSFER_FORCE_SHORT
-All transmitted frames are short terminated.
-.It LIBUSB20_TRANSFER_DO_CLEAR_STALL
-Will do a clear-stall before starting the transfer.
-.El
-.
-.Pp
-.
-.Fn libusb20_tr_get_length
-returns the length of the given USB frame by index.
-After an USB transfer is complete the USB frame length will get updated to the actual transferred length.
-.
-.Pp
-.
-.Fn libusb20_tr_set_length
-sets the length of the given USB frame by index.
-.
+.Ft int
+.Fn libusb_init libusb_context **ctx
+This function initialises libusb. Must be called at the beginning
+of the program. This function returns 0 on success or LIBUSB_ERROR on 
+failure.
+. 
 .Pp
 .
-.Fn libusb20_tr_set_priv_sc0
-sets private driver pointer number zero.
+.Ft void
+.Fn libusb_exit "libusb_context *ctx"
+Deinitialise libusb. Must be called at the end of the application.
 .
 .Pp
 .
-.Fn libusb20_tr_set_priv_sc1
-sets private driver pointer number one.
+.Ft void
+.Fn libusb_set_debug "libusb_context *ctx" "int level"
+Set debug to the
+.Fa level
+level.
 .
 .Pp
 .
-.Fn libusb20_tr_set_timeout
-sets the timeout for the given USB transfer.
-.
-A timeout value of zero means no timeout.
-.
-The timeout is given in milliseconds.
+.Ft ssize_t
+.Fn libusb_get_device_list "libusb_context *ctx" "libusb_device ***list"
+Fill into
+.Fa list 
+the list of usb device available. All the device created by this
+function must be unref and free when you are done with them. This
+function returns the number of devices in list or a LIBUSB_ERROR code.
 .
 .Pp
 .
-.Fn libusb20_tr_set_total_frames
-sets the total number of frames that should be executed when the USB transfer is submitted.
-.
-The total number of USB frames must be less than the maximum number of USB frames associated with the given USB transfer.
+.Ft void
+.Fn libusb_free_device_list "libusb_device **list" "int unref_devices"
+Free the list of devices discovered by libusb_get_device_list. If 
+.Fa unref_device
+is set to 1 all devices are unref one time.
 .
 .Pp
 .
-.Fn libusb20_tr_setup_bulk
-is a helper function for setting up a single frame USB BULK transfer.
+.Ft uint8_t
+.Fn libusb_get_bus_number "libusb_device *dev"
+Returns the number of the bus contained by the device
+.Fa dev.
 .
 .Pp
 .
-.Fn libusb20_tr_setup_control
-is a helper function for setting up a single or dual
-frame USB CONTROL transfer depending on the control transfer length.
+.Ft uint8_t
+.Fn libusb_get_device_address "libusb_device *dev"
+Return the device_address contained by the device
+.Fa dev.
 .
 .Pp
 .
-.Fn libusb20_tr_setup_intr
-is a helper function for setting up a single frame USB INTERRUPT transfer.
+.Ft int
+.Fn libusb_get_max_packet_size "libusb_device *dev" "unsigned char endpoint"
+Return the wMaxPacketSize value on success, LIBUSB_ERROR_NOT_FOUND if the 
+endpoint does not exist and LIBUSB_ERROR_OTHERS on other failure.
 .
 .Pp
 .
-.Fn libusb20_tr_setup_isoc
-is a helper function for setting up a multi frame USB ISOCHRONOUS transfer.
+.Ft libusb_device *
+.Fn libusb_ref_device "libusb_device *dev"
+Increment the reference counter of the device
+.Fa dev.
 .
 .Pp
 .
-.Fn libusb20_tr_start
-will get the USB transfer started, if not already
-started.
-.
-This function will not get the transfer queued in hardware.
-.
-This function is non-blocking.
+.Ft void
+.Fn libusb_unref_device "libusb_device *dev"
+Decrement the reference counter of the device
+.Fa dev.
 .
 .Pp
 .
-.Fn libusb20_tr_stop
-will get the USB transfer stopped, if not already stopped.
-.
-This function is non-blocking, which means that the actual stop can
-happen after the return of this function.
+.Ft int
+.Fn libusb_open "libusb_device *dev" "libusb_device_handle **devh"
+Open a device and obtain a device_handle. Return 0 on success, 
+LIBUSB_ERROR_NO_MEM on memory allocation problem, LIBUSB_ERROR_ACCESS 
+on permission problem, LIBUSB_ERROR_NO_DEVICE if the device has been 
+disconnected and a LIBUSB_ERROR code on error.
 .
 .Pp
 .
-.Fn libusb20_tr_submit
-will get the USB transfer queued in hardware.
-.
+.Ft libusb_device_handle *
+.Fn libusb_open_device_with_vid_pid "libusb_context *ctx" "uint16_t vid" "uint16_t pid"
+Conveniance function to open a device with is 
+.Fa vid 
+and 
+.Fa pid.
+Return NULL on error.
 .
 .Pp
 .
-.Fn libusb20_tr_get_priv_sc0
-returns private driver pointer number zero associated
-with an USB transfer.
-.
+.Ft void
+.Fn libusb_close "libusb_device_handle *devh"
+Close a device handle.
 .
 .Pp
 .
-.Fn libusb20_tr_get_priv_sc1
-returns private driver pointer number one associated
-with an USB transfer.
-.
-.
-.Sh USB DEVICE OPERATIONS
+.Ft libusb_device *
+.Fn libusb_get_device(libusb_device_handle *devh)
+Get the device contained by devh. Return NULL on error.
 .
 .Pp
 .
-.Fn libusb20_dev_get_backend_name
-returns a zero terminated string describing the backend used.
+.Ft int
+.Fn libusb_get_configuration "libusb_device_handle *devh" "int *config"
+Return the bConfiguration value of the current configuration. return 0
+on success, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected 
+and a LIBUSB_ERROR code on error.
 .
 .Pp
 .
-.Fn libusb20_dev_get_info
-retrives the BSD specific usb_device_info structure into the memory location given by 
-.Fa pinfo .
-The USB device given by
-.Fa pdev
-must be opened before this function will succeed.
-This function returns zero on success else a LIBUSB20_ERROR value is returned.
+.Ft int
+.Fn libusb_set_configuration "libusb_device_handle *devh" "int config"
+Set the active configuration
+.Fa config
+for the device contained by
+.Fa devh.
+This function return 0 on success, LIBUSB_ERROR_NOT_FOUND if the requested
+configuration does not exist, LIBUSB_ERROR_BUSY if the interfaces are currently 
+claimed, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and a 
+LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_get_iface_desc
-retrieves the kernel interface description for the given USB
-.Fa iface_index .
-The format of the USB interface description is: "drivername<unit>: <description>"
-The description string is always zero terminated.
-A zero length string is written in case no driver is attached to the given interface.
-The USB device given by
-.Fa pdev
-must be opened before this function will succeed.
-This function returns zero on success else a LIBUSB20_ERROR value is returned.
+.Ft int
+.Fn libusb_claim_interface "libusb_device_handle *devh" "int interface_number"
+Claim an interface in a given libusb_handle
+.Fa devh.
+This is a non-blocking function. It return 0 success, LIBUSB_ERROR_NOT_FOUND 
+if the requested interface does not exist, LIBUSB_ERROR_BUSY if a program or 
+driver has claimed the interface, LIBUSB_ERROR_NO_DEVICE if the device has 
+been disconnected and a LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_get_desc
-returns a zero terminated string describing the given USB device.
-The format of the string is: "drivername<unit>: <description>"
+.Ft int
+.Fn libusb_release_interface "libusb_device_handle *devh" "int interface_number"
+This function release an interface. All the claimed interface must be released
+before closing a device. Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the 
+interafce was not claimed, LIBUSB_ERROR_NO_DEVICE if the device has been 
+disconnected and LIBUSB_ERROR on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_close
-will close the given USB device.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft int
+.Fn libusb_set_interface_alt_setting "libusb_device_handle *dev" "int interface_number" "int alternate_setting"
+Activate an alternate setting for an interface. Returns 0 on success, 
+LIBUSB_ERROR_NOT_FOUND if the interface was not claimed or the requested 
+setting does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been 
+disconnected and LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_detach_kernel_driver
-will try to detach the kernel driver for the USB interface given by
-.Fa iface_index .
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft int
+.Fn libusb_clear_halt "libusb_device_handle *devh" "unsigned char endpoint"
+Clear an halt/stall for a endpoint. Returns 0 on success, LIBUSB_ERROR_NOT_FOUND
+if the endpoint does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been 
+disconnected and a LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_set_config_index
-will try to set the configuration index on an USB
-device.
-.
-The first configuration index is zero.
-.
-The un-configure index is 255.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is returned.
+.Ft int
+.Fn libusb_reset_device "libusb_device_handle *devh"
+Perform an USB port reset for an usb device. Returns 0 on success,
+LIBUSB_ERROR_NOT_FOUND if re-enumeration is required or if the device has
+been disconnected and a LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_get_debug
-returns the debug level of an USB device.
+.Ft int
+.Fn libusb_kernel_driver_active "libusb_device_handle *devh" "int interface"
+Determine if a driver is active on a interface. Returns 0 if no kernel driver
+is active, returns 1 if a kernel driver is active, returns LIBUSB_ERROR_NO_DEVICE
+if the device has been disconnected and return a LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_get_fd
-returns the file descriptor of the given USB device.
-.
-A negative value is returned when no file descriptor is present.
-.
-The file descriptor can be used for polling purposes.
+.Ft int
+.Fn libusb_detach_kernel_driver "libusb_device_handle *devh" "int interface"
+Detach a kernel driver from an interface. This is needed to claim an interface
+required by a kernel driver. Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if
+no kernel driver was active, LIBUSB_ERROR_INVALID_PARAM if the interface does not
+exist, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and a 
+LIBUSB_ERROR code on failure. 
 .
 .Pp
 .
-.Fn libusb20_dev_kernel_driver_active
-returns a non-zero value if a kernel driver is active on
-the given USB interface.
-.
-Else zero is returned.
+.Ft int
+.Fn libusb_attach_kernel_driver "libusb_device_handle *devh" "int interface"
+Re-attach an interface kernel driver previously detached. Returns 0 on success, 
+LIBUSB_ERROR_INVALID_PARAM if the interface does not exist, LIBUSB_ERROR_NO_DEVICE
+if the device has been disconnect, LIBUSB_ERROR_BUSY if the driver cannot be 
+attached because the interface is claimed by a program or driver and a 
+LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_open
-opens an USB device so that setting up USB transfers
-becomes possible.
-.
-The number of USB transfers can be zero which means only control
-transfers are allowed.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
-.
-A return value of LIBUSB20_ERROR_BUSY means that the device is already
-opened.
+.Sh USB DESCRIPTORS
 .
 .Pp
 .
-.Fn libusb20_dev_process
-is called to sync kernel USB transfers with userland USB
-transfers.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned typically indicating that the given USB device has been
-detached.
+.Ft int
+.Fn libusb_get_device_descriptor "libusb_device *dev" "libusb_device_descriptor *desc"
+Get the USB device descriptor for the device
+.Fa dev.
+This is a non-blocking function. Returns 0 on success and a LIBUSB_ERROR code on 
+failure.
 .
 .Pp
-.
-.Fn libusb20_dev_request_sync
-will perform a synchronous control request on the given
-USB device.
-.
-Before this call will succeed the USB device must be opened.
-.
-.Fa setup
-is a pointer to a decoded and host endian SETUP packet.
-.Fa data
-is a pointer to a data transfer buffer associated with the control transaction. This argument can be NULL.
-.Fa pactlen
-is a pointer to a variable that will hold the actual transfer length after the control transaction is complete.
-.Fa timeout
-is the transaction timeout given in milliseconds.
-A timeout of zero means no timeout.
-.Fa flags
-is used to specify transaction flags, for example LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft int 
+.Fn libsub_get_active_config_descriptor "libusb_device *dev" "libusb_device_descriptor **config"
+Get the USB configuration descriptor for the active configuration. Returns 0 on 
+success, returns LIBUSB_ERROR_NOT_FOUND if the device is in unconfigured state 
+and return another LIBUSB_ERROR code on error.
 .
 .Pp
-.
-.Fn libusb20_dev_req_string_sync
-will synchronously request an USB string by language ID
-and string index into the given buffer limited by a maximum length.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft int 
+.Fn libusb_get_config_descriptor "libusb_device *dev" "uint8_t config_index" "libusb_config_descriptor **config"
+Get USB configuration descriptor based on its index 
+.Fa idx.
+Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the configuration does not exist 
+and returns another LIBUSB_ERROR code on error.
 .
 .Pp
-.
-.Fn libusb20_dev_req_string_simple_sync
-will synchronously request an USB string using the
-default language ID and convert the string into ASCII before storing
-the string into the given buffer limited by a maximum length which
-includes the terminating zero.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
-.
+.Ft int
+.Fn libusb_get_config_descriptor_by_value "libusb_device *dev" "uint8 bConfigurationValue" "libusb_config_descriptor **config"
+Get a USB configuration descriptor with a specific bConfigurationValue. This is 
+a non-blocking function which does not send request through the device. Returns 0 
+on success, LIBUSB_ERROR_NOT_FOUND if the configuration does not exist and another 
+LIBUSB_ERROR code on failure.
 .
 .Pp
-.
-.Fn libusb20_dev_reset
-will try to BUS reset the given USB device and restore
-the last set USB configuration.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft void
+.Fn libusb_free_config_descriptor "libusb_config_descriptor *config`"
+Free a configuration descriptor.
 .
 .Pp
-.
-.Fn libusb20_dev_set_power_mode
-sets the power mode of the USB device.
-.
-Valid power modes:
-.Bl -tag
-.It LIBUSB20_POWER_OFF
-.It LIBUSB20_POWER_ON
-.It LIBUSB20_POWER_SAVE
-.It LIBUSB20_POWER_SUSPEND
-.It LIBUSB20_POWER_RESUME
-.El
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft int
+.Fn libusb_get_string_descriptor_ascii "libusb_device_handle *devh" "uint8_t desc_idx" "unsigned char *data" "int length"
+Retrieve a string descriptor in C style ascii. Returns a number of byte on success 
+and a LIBUSB_ERROR code on failure.
 .
 .Pp
 .
-.Fn libusb20_dev_get_power_mode
-returns the currently selected power mode for the given
-USB device.
+.Sh USB ASYNCHRONOUS I/O
 .
 .Pp
-.
-.Fn libusb20_dev_set_alt_index
-will try to set the given alternate index for the given
-USB interface index.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft struct libusb_transfer *
+.Fn libusb_alloc_transfer "int iso_packets"
+Allocate a transfer with
+.Fa iso_packets
+numbers of isochronous packet descriptors. Returns NULL on error.
 .
 .Pp
-.
-.Fn libusb20_dev_get_device_desc
-returns a pointer to the decoded and host endian version
-of the device descriptor.
-.
-The USB device need not be opened when calling this function.
+.Ft void
+.Fn libusb_free_transfer "struct libusb_transfer *tr"
+Free a transfer.
 .
 .Pp
-.
-.Fn libusb20_dev_alloc_config
-will read out and decode the USB config descriptor for
-the given USB device and config index. This function returns a pointer
-to the decoded configuration which must eventually be passed to
-free(). NULL is returned in case of failure.
+.Ft int
+.Fn libusb_submit_transfer "struct libusb_transfer *tr"
+This function will submit a transfer and returns immediately. Returns 0 on 
+success, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and 
+LIBUSB_ERROR code on other failure.
 .
 .Pp
-.
-.Fn libusb20_dev_alloc
-is an internal function to allocate a new USB device.
+.Ft int
+.Fn libusb_cancel_transfer "struct libusb_transfer *tr"
+This function asynchronously cancel a transfer. Returns 0 on success and 
+LIBUSB_ERROR code on failure.
 .
 .Pp
-.
-.Fn libusb20_dev_get_address
-returns the internal and not necessarily the real
-hardware address of the given USB device.
+.Sh USB SYNCHRONOUS I/O
 .
 .Pp
-.
-.Fn libusb20_dev_get_bus_number
-returns the internal bus number which the given USB
-device belongs to.
+.Ft int
+.Fn libusb_control_transfer "libusb_device_handle *devh" "uint8_t bmRequestType" "uint16_t wIndex" "unsigned char *data" "uint16_t wLength" "unsigned int timeout"
+Perform a USB control transfer. Returns 0 on success, LIBUSB_ERROR_TIMEOUT 
+if the transfer timeout, LIBUSB_ERROR_PIPE if the control request was not 
+supported, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and 
+LIBUSB_ERROR code on other failure.
 .
 .Pp
-.
-.Fn libusb20_dev_get_mode
-returns the current operation mode of the USB entity.
-.
-Valid return values are:
-.Bl -tag
-.It LIBUSB20_MODE_HOST
-.It LIBUSB20_MODE_DEVICE
-.El
+.Ft int
+.Fn libusb_bulk_transfer "struct libusb_device_handle *devh" "unsigned char endpoint" "unsigned char *data" "int length" "int *transferred" "unsigned int timeout"
+Perform an USB bulk transfer. Returns 0 on success, LIBUSB_ERROR_TIMEOUT 
+if the transfer timeout, LIBUSB_ERROR_PIPE if the control request was not 
+supported, LIBUSB_ERROR_OVERFLOW if the device offered more data, 
+LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and 
+LIBUSB_ERROR code on other failure.
 .
 .Pp
-.
-.Fn libusb20_dev_get_speed
-returns the current speed of the given USB device.
-.
-.Bl -tag
-.It LIBUSB20_SPEED_UNKNOWN
-.It LIBUSB20_SPEED_LOW
-.It LIBUSB20_SPEED_FULL
-.It LIBUSB20_SPEED_HIGH
-.It LIBUSB20_SPEED_VARIABLE
-.It LIBUSB20_SPEED_SUPER
-.El
+.Ft int
+.Fn libusb_interrupt_transfer "struct libusb_device_handle *devh" "unsigned char endpoint" "unsigned char *data" "int length" "int *transferred" "unsigned int timeout"
+Perform an USB Interrupt transfer. Returns 0 on success, LIBUSB_ERROR_TIMEOUT 
+if the transfer timeout, LIBUSB_ERROR_PIPE if the control request was not 
+supported, LIBUSB_ERROR_OVERFLOW if the device offered more data, 
+LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and 
+LIBUSB_ERROR code on other failure.
 .
 .Pp
-.
-.Fn libusb20_dev_get_config_index
-This function returns the currently select config index for the given
-USB device.
+.Sh USB EVENTS
 .
 .Pp
-.
-.Fn libusb20_dev_free
-will free the given USB device and all associated USB
-transfers.
+.Ft int
+.Fn libusb_try_lock_events "libusb_context *ctx"
+Try to acquire the event handling lock. Returns 0 if the lock was obtained and 1
+if not.
 .
 .Pp
-.
-.Fn libusb20_dev_set_debug
-will set the debug level for the given USB device.
+.Ft void
+.Fn libusb_lock_events "libusb_context *ctx"
+Acquire the event handling lock. This function is blocking.
 .
 .Pp
-.
-.Fn libusb20_dev_wait_process
-function will wait until a pending USB transfer has completed on
-the given USB device.
-.
-A timeout value can be specified which is passed on to the
-.Xr poll 2
-function.
-.
-.Sh USB BACKEND OPERATIONS
-.
-.Fn libusb20_be_get_template
-will return the currently selected global USB device
-side mode template into the integer pointer
-.Fa ptemp .
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft void
+.Fn libusb_unlock_events "libusb_context *ctx"
+Release the event handling lock. This will wake up any thread blocked
+on libusb_wait_for_event().
 .
 .Pp
-.
-.Fn libusb20_be_set_template
-will set the global USB device side mode template to
-.Fa temp .
-The new template is not activated until after the next USB
-enumeration.
-The template number decides how the USB device will present itself to
-the USB Host, like Mass Storage Device, USB Ethernet Device. Also see
-the
-.Xr usb2_template 4
-module.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
+.Ft int
+.Fn libusb_event_handling_ok "libusb_context *ctx"
+Determine if it still OK for this thread to be doing event handling. Returns 1
+if event handling can start or continue. Returns 0 if this thread must give up
+the events lock.
 .
 .Pp
-.
-.Fn libusb20_be_get_dev_quirk
-This function will return the device quirk according to
-.Fa index
-into the libusb20_quirk structure pointed to by
-.Fa pq .
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
-.
-If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
-returned.
+.Ft int
+.Fn libusb_event_handler_active "libusb_context *ctx"
+Determine if an active thread is handling events. Returns 1 if yes and 0 if there
+are no threads currently handling events.
 .
 .Pp
-.
-.Fn libusb20_be_get_quirk_name
-will return the quirk name according to
-.Fa index
-into the libusb20_quirk structure pointed to by
-.Fa pq .
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
-.
-If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
-returned.
+.Ft void
+.Fn libusb_lock_event_waiters "libusb_context *ctx"
+Acquire the event_waiters lock. This lock is designed to be obtained under the
+situation where you want to be aware when events are completed, but some other
+thread is event handling so calling libusb_handle_events() is not allowed.
 .
 .Pp
-.
-.Fn libusb20_be_add_dev_quirk
-will add the libusb20_quirk structure pointed to by the
-.Fa pq
-argument into the device quirk list.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
-.
-If the given quirk cannot be added LIBUSB20_ERROR_NO_MEM is
-returned.
+.Ft void
+.Fn libusb_unlock_event_waiters "libusb_context *ctx"
+Release the event_waiters lock.
 .
 .Pp
-.
-.Fn libusb20_be_remove_dev_quirk
-will remove the quirk matching the libusb20_quirk structure pointed to by the
-.Fa pq
-argument from the device quirk list.
-.
-This function returns zero on success else a LIBUSB20_ERROR value is
-returned.
-.
-If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
-returned.
+.Ft int 
+.Fn libusb_wait_for_event "libusb_context *ctx" "struct timeval *tv"
+Wait for another thread to signal completion of an event. Must be called
+with the event waiters lock held, see libusb_lock_event_waiters(). This will
+block until the timeout expires or a transfer completes or a thread releases
+the event handling lock through libusb_unlock_events(). Returns 0 after a 
+transfer completes or another thread stops event handling, returns 1 if the
+timeout expired.
 .
 .Pp
-.
-.Fn libusb20_be_alloc_default
-.Fn libusb20_be_alloc_freebsd
-.Fn libusb20_be_alloc_linux
-These functions are used to allocate a specific USB backend or the
-operating system default USB backend. Allocating a backend is a way to
-scan for currently present USB devices.
+.Ft int
+.Fn libusb_handle_events_timeout "libusb_context *ctx" "struct timeval *tv"
+Handle any pending events by checking if timeouts have expired and by 
+checking the set of file descriptors for activity. Returns 0 on success, or a
+LIBUSB_ERROR code on failure.
 .
 .Pp
-.
-.Fn libusb20_be_device_foreach
-is used to iterate USB devices present in a USB backend.
-.
-The starting value of
-.Fa pdev
-is NULL.
-.
-This function returns the next USB device in the list.
-.
-If NULL is returned the end of the USB device list has been reached.
+.Ft int
+.Fn libusb_handle_events "libusb_context *ctx"
+Handle any pending events in blocking mode with a sensible timeout. Returns 0
+on success, returns a LIBUSB_ERROR code on failure.
 .
 .Pp
-.
-.Fn libusb20_be_dequeue_device
-will dequeue the given USB device pointer from the
-backend USB device list.
-.
-Dequeued USB devices will not be freed when the backend is freed.
+.Ft int
+.Fn libusb_handle_events_locked "libusb_context *ctx" "struct timeval *tv"
+Handle any pending events by polling file desciptors, without checking if
+another threads are already doing so. Must be called with the event lock held.
 .
 .Pp
-.
-.Fn libusb20_be_enqueue_device
-This function will enqueue the given USB device pointer in the backend USB device list.
-.
-Enqueued USB devices will get freed when the backend is freed.
+.Ft int
+.Fn libusb_get_next_timeout "libusb_context *ctx" "struct timeval *tv"
+Determine the next internal timeout that libusb needs to handle. Returns 0
+if there are no pending timeouts, 1 if a timeout was returned, or LIBUSB_ERROR
+code on failure.
 .
 .Pp
-.
-.Fn libusb20_be_free
-will free the given backend and all USB devices in its device list.
-.
-.
-.Sh USB DESCRIPTOR PARSING
-.
-.Fn libusb20_me_get_1 pie offset
-This function will return a byte at the given byte offset of a message
-entity.
-.
-This function is safe against invalid offsets.
+.Ft void
+.Fn libusb_set_pollfd_notifiers "libusb_context *ctx" "libusb_pollfd_added_cb added_cb" "libusb_pollfd_removed_cb remove_cb" "void *user_data"
+Register notification functions for file descriptor additions/removals.
+These functions will be invoked for every new or removed file descriptor
+that libusb uses as an event source.
 .
 .Pp
+.Ft const struct libusb_pollfd **
+.Fn libusb_get_pollfds "libusb_context *ctx"
+Retrive a list of file descriptors that should be polled by your main loop as 
+libusb event sources. Returns a NULL-terminated list on success or NULL on failure.
 .
-.Fn libusb20_me_get_2 pie offset
-This function will return a little endian 16-bit value at the given byte offset of a message
-entity.
-.
-This function is safe against invalid offsets.
-.
+.Sh LIBUSB VERSION 0.1 COMPATIBILITY
 .Pp
-.
-.Fn libusb20_me_encode pbuf len pdecoded
-This function will encode a so-called *DECODED structure into binary
-format.
-.
-The total encoded length that will fit in the given buffer is
-returned.
-.
-If the buffer pointer is NULL no data will be written to the buffer
-location.
-.
+The library is also compliant with LibUSB version 0.1.12.
 .Pp
-.
-.Fn libusb20_me_decode pbuf len pdecoded
-This function will decode a binary structure into a so-called *DECODED
-structure.
-.
-The total decoded length is returned.
-.
-The buffer pointer cannot be NULL.
-.
-.
-.Sh LIBUSB VERSION 0.1 COMPATIBILITY
-.
 .Fn usb_open
 .Fn usb_close
 .Fn usb_get_string
@@ -946,20 +488,16 @@ The buffer pointer cannot be NULL.
 .Fn usb_find_devices
 .Fn usb_device
 .Fn usb_get_busses
-These functions are compliant with LibUSB version 0.1.12.
-.
-.Sh FILES
 .
-.
-/dev/usb
 .Sh SEE ALSO
+.Xr libusb20 3 ,
 .Xr usb 4 ,
 .Xr usbconfig 8
-.
+.Pp
+.Pa http://libusb.sourceforge.net/
 .
 .Sh HISTORY
 .
-.
-Some parts of the
 .Nm
-API derives from the libusb project at sourceforge.
+support first appeared in
+.Fx 8.0 .
diff --git a/lib/libusb/libusb20.3 b/lib/libusb/libusb20.3
new file mode 100644
index 0000000..403ddba
--- /dev/null
+++ b/lib/libusb/libusb20.3
@@ -0,0 +1,940 @@
+.\"
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 22, 2009
+.Dt LIBUSB20 3
+.Os
+.Sh NAME
+.Nm libusb20
+.
+.Nd "USB access library"
+.
+.
+.Sh LIBRARY
+.
+.
+USB access library (libusb -lusb)
+.
+.
+.
+.Sh SYNOPSIS
+.In libusb20.h
+.Ft int
+.Fn libusb20_tr_close "struct libusb20_transfer *xfer"
+.Ft int
+.Fn libusb20_tr_open "struct libusb20_transfer *xfer" "uint32_t max_buf_size" "uint32_t max_frame_count" "uint8_t ep_no"
+.Ft struct libusb20_transfer*
+.Fn libusb20_tr_get_pointer "struct libusb20_device *pdev"  "uint16_t tr_index"
+.Ft uint16_t
+.Fn libusb20_tr_get_time_complete "struct libusb20_transfer *xfer"
+.Ft uint32_t
+.Fn libusb20_tr_get_actual_frames "struct libusb20_transfer *xfer"
+.Ft uint32_t
+.Fn libusb20_tr_get_actual_length "struct libusb20_transfer *xfer"
+.Ft uint32_t
+.Fn libusb20_tr_get_max_frames "struct libusb20_transfer *xfer"
+.Ft uint32_t
+.Fn libusb20_tr_get_max_packet_length "struct libusb20_transfer *xfer"
+.Ft uint32_t
+.Fn libusb20_tr_get_max_total_length "struct libusb20_transfer *xfer"
+.Ft uint8_t
+.Fn libusb20_tr_get_status "struct libusb20_transfer *xfer"
+.Ft uint8_t
+.Fn libusb20_tr_pending "struct libusb20_transfer *xfer"
+.Ft void
+.Fn libusb20_tr_callback_wrapper "struct libusb20_transfer *xfer"
+.Ft void
+.Fn libusb20_tr_clear_stall_sync "struct libusb20_transfer *xfer"
+.Ft void
+.Fn libusb20_tr_drain "struct libusb20_transfer *xfer"
+.Ft void
+.Fn libusb20_tr_set_buffer "struct libusb20_transfer *xfer" "void *buffer" "uint16_t fr_index"
+.Ft void
+.Fn libusb20_tr_set_callback "struct libusb20_transfer *xfer" "libusb20_tr_callback_t *cb"
+.Ft void
+.Fn libusb20_tr_set_flags "struct libusb20_transfer *xfer" "uint8_t flags"
+.Ft uint32_t
+.Fn libusb20_tr_get_length "struct libusb20_transfer *xfer" "uint16_t fr_index"
+.Ft void
+.Fn libusb20_tr_set_length "struct libusb20_transfer *xfer" "uint32_t length" "uint16_t fr_index"
+.Ft void
+.Fn libusb20_tr_set_priv_sc0 "struct libusb20_transfer *xfer" "void *sc0"
+.Ft void
+.Fn libusb20_tr_set_priv_sc1 "struct libusb20_transfer *xfer" "void *sc1"
+.Ft void
+.Fn libusb20_tr_set_timeout "struct libusb20_transfer *xfer" "uint32_t timeout"
+.Ft void
+.Fn libusb20_tr_set_total_frames "struct libusb20_transfer *xfer" "uint32_t nframes"
+.Ft void
+.Fn libusb20_tr_setup_bulk "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t timeout"
+.Ft void
+.Fn libusb20_tr_setup_control "struct libusb20_transfer *xfer" "void *psetup" "void *pbuf" "uint32_t timeout"
+.Ft void
+.Fn libusb20_tr_setup_intr "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t timeout"
+.Ft void
+.Fn libusb20_tr_setup_isoc "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint61_t fr_index"
+.Ft void
+.Fn libusb20_tr_start "struct libusb20_transfer *xfer"
+.Ft void
+.Fn libusb20_tr_stop "struct libusb20_transfer *xfer"
+.Ft void
+.Fn libusb20_tr_submit "struct libusb20_transfer *xfer"
+.Ft void *
+.Fn libusb20_tr_get_priv_sc0 "struct libusb20_transfer *xfer"
+.Ft void *
+.Fn libusb20_tr_get_priv_sc1 "struct libusb20_transfer *xfer"
+.Ft const char *
+.Fn libusb20_dev_get_backend_name "struct libusb20_device *"
+.Ft int
+.Fn libusb20_dev_get_info "struct libusb20_device *pdev" "struct usb_device_info *pinfo"
+.Ft int
+.Fn libusb20_dev_get_iface_desc "struct libusb20_device *pdev" "uint8_t iface_index" "char *buf" "uint8_t len"
+.Ft const char *
+.Fn libusb20_dev_get_desc "struct libusb20_device *pdev"
+.Ft int
+.Fn libusb20_dev_close "struct libusb20_device *pdev"
+.Ft int
+.Fn libusb20_dev_detach_kernel_driver "struct libusb20_device *pdev" "uint8_t iface_index"
+.Ft int
+.Fn libusb20_dev_set_config_index "struct libusb20_device *pdev" "uint8_t configIndex"
+.Ft int
+.Fn libusb20_dev_get_debug "struct libusb20_device *pdev"
+.Ft int
+.Fn libusb20_dev_get_fd "struct libusb20_device *pdev"
+.Ft int
+.Fn libusb20_dev_kernel_driver_active "struct libusb20_device *pdev" "uint8_t iface_index"
+.Ft int
+.Fn libusb20_dev_open "struct libusb20_device *pdev" "uint16_t transfer_max"
+.Ft int
+.Fn libusb20_dev_process "struct libusb20_device *pdev"
+.Ft int
+.Fn 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"
+.Ft int
+.Fn libusb20_dev_req_string_sync "struct libusb20_device *pdev" "uint8_t index" "uint16_t langid" "void *ptr" "uint16_t len"
+.Ft int
+.Fn libusb20_dev_req_string_simple_sync "struct libusb20_device *pdev" "uint8_t index" "void *ptr" "uint16_t len"
+.Ft int
+.Fn libusb20_dev_reset "struct libusb20_device *pdev"
+.Ft int
+.Fn libusb20_dev_set_power_mode "struct libusb20_device *pdev" "uint8_t power_mode"
+.Ft uint8_t
+.Fn libusb20_dev_get_power_mode "struct libusb20_device *pdev"
+.Ft int
+.Fn libusb20_dev_set_alt_index "struct libusb20_device *pdev" "uint8_t iface_index" "uint8_t alt_index"
+.Ft struct LIBUSB20_DEVICE_DESC_DECODED *
+.Fn libusb20_dev_get_device_desc "struct libusb20_device *pdev"
+.Ft struct libusb20_config *
+.Fn libusb20_dev_alloc_config "struct libusb20_device *pdev" "uint8_t config_index"
+.Ft struct libusb20_device *
+.Fn libusb20_dev_alloc "void"
+.Ft uint8_t
+.Fn libusb20_dev_get_address "struct libusb20_device *pdev"
+.Ft uint8_t
+.Fn libusb20_dev_get_bus_number "struct libusb20_device *pdev"
+.Ft uint8_t
+.Fn libusb20_dev_get_mode "struct libusb20_device *pdev"
+.Ft uint8_t
+.Fn libusb20_dev_get_speed "struct libusb20_device *pdev"
+.Ft uint8_t
+.Fn libusb20_dev_get_config_index "struct libusb20_device *pdev"
+.Ft void
+.Fn libusb20_dev_free "struct libusb20_device *pdev"
+.Ft void
+.Fn libusb20_dev_set_debug "struct libusb20_device *pdev" "int debug"
+.Ft void
+.Fn libusb20_dev_wait_process "struct libusb20_device *pdev" "int timeout"
+.Ft int
+.Fn libusb20_be_get_template "struct libusb20_backend *pbe" "int *ptemp"
+.Ft int
+.Fn libusb20_be_set_template "struct libusb20_backend *pbe" "int temp"
+.Ft int
+.Fn libusb20_be_get_dev_quirk "struct libusb20_backend *pber", "uint16_t index" "struct libusb20_quirk *pq"
+.Ft int
+.Fn libusb20_be_get_quirk_name "struct libusb20_backend *pbe" "uint16_t index" "struct libusb20_quirk *pq"
+.Ft int
+.Fn libusb20_be_add_dev_quirk "struct libusb20_backend *pbe" "struct libusb20_quirk *pq"
+.Ft int
+.Fn libusb20_be_remove_dev_quirk "struct libusb20_backend *pbe" "struct libusb20_quirk *pq"
+.Ft struct libusb20_backend *
+.Fn libusb20_be_alloc_default "void"
+.Ft struct libusb20_backend *
+.Fn libusb20_be_alloc_freebsd "void"
+.Ft struct libusb20_backend *
+.Fn libusb20_be_alloc_linux "void"
+.Ft struct libusb20_device *
+.Fn libusb20_be_device_foreach  "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
+.Ft void
+.Fn libusb20_be_dequeue_device "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
+.Ft void
+.Fn libusb20_be_enqueue_device "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
+.Ft void
+.Fn libusb20_be_free "struct libusb20_backend *pbe"
+.Ft uint8_t
+.Fn libusb20_me_get_1 "const struct libusb20_me_struct *me" "uint16_t off"
+.Ft uint16_t
+.Fn libusb20_me_get_2 "const struct libusb20_me_struct *me" "uint16_t off"
+.Ft uint16_t
+.Fn libusb20_me_encode "void *pdata" "uint16_t len" "const void *pdecoded"
+.Ft uint16_t
+.Fn libusb20_me_decode "const void *pdata" "uint16_t len" "void *pdecoded"
+.Ft "const uint8_t *"
+.Fn libusb20_desc_foreach "const struct libusb20_me_struct *me" "const uint8_t *pdesc"
+.
+.
+.Sh DESCRIPTION
+.
+The
+.Nm
+library implements functions to be able to easily access and control
+USB through the USB file system interface.
+The
+.Nm
+interfaces are specific to the
+.Fx
+usb stack and are not available on other operating systems, portable
+applications should consider using
+.Xr libusb 3 .
+.
+.
+.Sh USB TRANSFER OPERATIONS
+.
+.Pp
+.
+.Fn libusb20_tr_close
+will release all kernel resources associated with an USB
+.Fa xfer .
+.
+This function returns zero upon success.
+.
+Non-zero return values indicate a LIBUSB20_ERROR value.
+.
+.Pp
+.
+.Fn libusb20_tr_open
+will allocate kernel buffer resources according to
+.Fa max_buf_size
+and
+.Fa max_frame_count
+associated with an USB
+.Fa pxfer
+and bind the transfer to the specified
+.Fa ep_no .
+.Fa max_buf_size
+is the minimum buffer size which the data transport layer has to support.
+If
+.Fa max_buf_size
+is zero, the
+.Nm
+library will use wMaxPacketSize to compute the buffer size.
+This can be useful for isochronous transfers.
+The actual buffer size can be greater than
+.Fa max_buf_size
+and is returned by
+.Fn libusb20_tr_get_max_total_length .
+.
+This function returns zero upon success.
+.
+Non-zero return values indicate a LIBUSB20_ERROR value.
+.
+.Pp
+.
+.Fn libusb20_tr_get_pointer
+will return a pointer to the allocated USB transfer according to the
+.Fa pdev
+and
+.Fa tr_index
+arguments.
+.
+This function returns NULL in case of failure.
+.
+.Pp
+.
+.Fn libusb20_tr_get_time_complete
+will return the completion time of an USB transfer in
+millisecond units. This function is most useful for isochronous USB
+transfers when doing echo cancelling.
+.
+.Pp
+.
+.Fn libusb20_tr_get_actual_frames
+will return the actual number of USB frames after an USB
+transfer completed. A value of zero means that no data was transferred.
+.
+.Pp
+.
+.Fn libusb20_tr_get_actual_length
+will return the sum of the actual length for all
+transferred USB frames for the given USB transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_get_max_frames
+will return the maximum number of USB frames that were
+allocated when an USB transfer was setup for the given USB transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_get_max_packet_length
+will return the maximum packet length in bytes
+associated with the given USB transfer.
+.
+The packet length can be used round up buffer sizes so that short USB
+packets are avoided for proxy buffers.
+.
+.
+.Pp
+.
+.Fn libusb20_tr_get_max_total_length
+function will return the maximum value for the length sum of all
+USB frames associated with an USB transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_get_status
+will return the status of an USB transfer.
+.
+Status values are defined by a set of LIBUSB20_TRANSFER_XXX enums.
+.
+.Pp
+.
+.Fn libusb20_tr_pending
+will return non-zero if the given USB transfer is
+pending for completion.
+.
+Else this function returns zero.
+.
+.Pp
+.
+.Fn libusb20_tr_callback_wrapper
+This is an internal function used to wrap asynchronous USB callbacks.
+.
+.Pp
+.
+.Fn libusb20_tr_clear_stall_sync
+This is an internal function used to synchronously clear the stall on
+the given USB transfer.
+.
+Please see the USB specification for more information on stall
+clearing.
+.
+If the given USB transfer is pending when this function is called, the
+USB transfer will complete with an error after that this function has
+been called.
+.
+.Pp
+.
+.Fn libusb20_tr_drain
+will stop the given USB transfer and will not return
+until the USB transfer has been stopped in hardware.
+.
+.Pp
+.
+.Fn libusb20_tr_set_buffer
+is used to set the
+.Fa buffer
+pointer for the given USB transfer and
+.Fa fr_index .
+.
+Typically the frame index is zero.
+.
+.
+.Pp
+.
+.Fn libusb20_tr_set_callback
+is used to set the USB callback for asynchronous USB
+transfers.
+.
+The callback type is defined by libusb20_tr_callback_t.
+.
+.Pp
+.
+.Fn libusb20_tr_set_flags
+is used to set various USB flags for the given USB transfer.
+.Bl -tag
+.It LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK
+Report a short frame as error.
+.It LIBUSB20_TRANSFER_MULTI_SHORT_NOT_OK
+Multiple short frames are not allowed.
+.It LIBUSB20_TRANSFER_FORCE_SHORT
+All transmitted frames are short terminated.
+.It LIBUSB20_TRANSFER_DO_CLEAR_STALL
+Will do a clear-stall before starting the transfer.
+.El
+.
+.Pp
+.
+.Fn libusb20_tr_get_length
+returns the length of the given USB frame by index.
+After an USB transfer is complete the USB frame length will get updated to the actual transferred length.
+.
+.Pp
+.
+.Fn libusb20_tr_set_length
+sets the length of the given USB frame by index.
+.
+.Pp
+.
+.Fn libusb20_tr_set_priv_sc0
+sets private driver pointer number zero.
+.
+.Pp
+.
+.Fn libusb20_tr_set_priv_sc1
+sets private driver pointer number one.
+.
+.Pp
+.
+.Fn libusb20_tr_set_timeout
+sets the timeout for the given USB transfer.
+.
+A timeout value of zero means no timeout.
+.
+The timeout is given in milliseconds.
+.
+.Pp
+.
+.Fn libusb20_tr_set_total_frames
+sets the total number of frames that should be executed when the USB transfer is submitted.
+.
+The total number of USB frames must be less than the maximum number of USB frames associated with the given USB transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_setup_bulk
+is a helper function for setting up a single frame USB BULK transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_setup_control
+is a helper function for setting up a single or dual
+frame USB CONTROL transfer depending on the control transfer length.
+.
+.Pp
+.
+.Fn libusb20_tr_setup_intr
+is a helper function for setting up a single frame USB INTERRUPT transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_setup_isoc
+is a helper function for setting up a multi frame USB ISOCHRONOUS transfer.
+.
+.Pp
+.
+.Fn libusb20_tr_start
+will get the USB transfer started, if not already
+started.
+.
+This function will not get the transfer queued in hardware.
+.
+This function is non-blocking.
+.
+.Pp
+.
+.Fn libusb20_tr_stop
+will get the USB transfer stopped, if not already stopped.
+.
+This function is non-blocking, which means that the actual stop can
+happen after the return of this function.
+.
+.Pp
+.
+.Fn libusb20_tr_submit
+will get the USB transfer queued in hardware.
+.
+.
+.Pp
+.
+.Fn libusb20_tr_get_priv_sc0
+returns private driver pointer number zero associated
+with an USB transfer.
+.
+.
+.Pp
+.
+.Fn libusb20_tr_get_priv_sc1
+returns private driver pointer number one associated
+with an USB transfer.
+.
+.
+.Sh USB DEVICE OPERATIONS
+.
+.Pp
+.
+.Fn libusb20_dev_get_backend_name
+returns a zero terminated string describing the backend used.
+.
+.Pp
+.
+.Fn libusb20_dev_get_info
+retrives the BSD specific usb_device_info structure into the memory location given by 
+.Fa pinfo .
+The USB device given by
+.Fa pdev
+must be opened before this function will succeed.
+This function returns zero on success else a LIBUSB20_ERROR value is returned.
+.
+.Pp
+.
+.Fn libusb20_dev_get_iface_desc
+retrieves the kernel interface description for the given USB
+.Fa iface_index .
+The format of the USB interface description is: "drivername<unit>: <description>"
+The description string is always zero terminated.
+A zero length string is written in case no driver is attached to the given interface.
+The USB device given by
+.Fa pdev
+must be opened before this function will succeed.
+This function returns zero on success else a LIBUSB20_ERROR value is returned.
+.
+.Pp
+.
+.Fn libusb20_dev_get_desc
+returns a zero terminated string describing the given USB device.
+The format of the string is: "drivername<unit>: <description>"
+.
+.Pp
+.
+.Fn libusb20_dev_close
+will close the given USB device.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_detach_kernel_driver
+will try to detach the kernel driver for the USB interface given by
+.Fa iface_index .
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_set_config_index
+will try to set the configuration index on an USB
+device.
+.
+The first configuration index is zero.
+.
+The un-configure index is 255.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is returned.
+.
+.Pp
+.
+.Fn libusb20_dev_get_debug
+returns the debug level of an USB device.
+.
+.Pp
+.
+.Fn libusb20_dev_get_fd
+returns the file descriptor of the given USB device.
+.
+A negative value is returned when no file descriptor is present.
+.
+The file descriptor can be used for polling purposes.
+.
+.Pp
+.
+.Fn libusb20_dev_kernel_driver_active
+returns a non-zero value if a kernel driver is active on
+the given USB interface.
+.
+Else zero is returned.
+.
+.Pp
+.
+.Fn libusb20_dev_open
+opens an USB device so that setting up USB transfers
+becomes possible.
+.
+The number of USB transfers can be zero which means only control
+transfers are allowed.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+A return value of LIBUSB20_ERROR_BUSY means that the device is already
+opened.
+.
+.Pp
+.
+.Fn libusb20_dev_process
+is called to sync kernel USB transfers with userland USB
+transfers.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned typically indicating that the given USB device has been
+detached.
+.
+.Pp
+.
+.Fn libusb20_dev_request_sync
+will perform a synchronous control request on the given
+USB device.
+.
+Before this call will succeed the USB device must be opened.
+.
+.Fa setup
+is a pointer to a decoded and host endian SETUP packet.
+.Fa data
+is a pointer to a data transfer buffer associated with the control transaction. This argument can be NULL.
+.Fa pactlen
+is a pointer to a variable that will hold the actual transfer length after the control transaction is complete.
+.Fa timeout
+is the transaction timeout given in milliseconds.
+A timeout of zero means no timeout.
+.Fa flags
+is used to specify transaction flags, for example LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_req_string_sync
+will synchronously request an USB string by language ID
+and string index into the given buffer limited by a maximum length.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_req_string_simple_sync
+will synchronously request an USB string using the
+default language ID and convert the string into ASCII before storing
+the string into the given buffer limited by a maximum length which
+includes the terminating zero.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.
+.Pp
+.
+.Fn libusb20_dev_reset
+will try to BUS reset the given USB device and restore
+the last set USB configuration.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_set_power_mode
+sets the power mode of the USB device.
+.
+Valid power modes:
+.Bl -tag
+.It LIBUSB20_POWER_OFF
+.It LIBUSB20_POWER_ON
+.It LIBUSB20_POWER_SAVE
+.It LIBUSB20_POWER_SUSPEND
+.It LIBUSB20_POWER_RESUME
+.El
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_get_power_mode
+returns the currently selected power mode for the given
+USB device.
+.
+.Pp
+.
+.Fn libusb20_dev_set_alt_index
+will try to set the given alternate index for the given
+USB interface index.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_dev_get_device_desc
+returns a pointer to the decoded and host endian version
+of the device descriptor.
+.
+The USB device need not be opened when calling this function.
+.
+.Pp
+.
+.Fn libusb20_dev_alloc_config
+will read out and decode the USB config descriptor for
+the given USB device and config index. This function returns a pointer
+to the decoded configuration which must eventually be passed to
+free(). NULL is returned in case of failure.
+.
+.Pp
+.
+.Fn libusb20_dev_alloc
+is an internal function to allocate a new USB device.
+.
+.Pp
+.
+.Fn libusb20_dev_get_address
+returns the internal and not necessarily the real
+hardware address of the given USB device.
+.
+.Pp
+.
+.Fn libusb20_dev_get_bus_number
+returns the internal bus number which the given USB
+device belongs to.
+.
+.Pp
+.
+.Fn libusb20_dev_get_mode
+returns the current operation mode of the USB entity.
+.
+Valid return values are:
+.Bl -tag
+.It LIBUSB20_MODE_HOST
+.It LIBUSB20_MODE_DEVICE
+.El
+.
+.Pp
+.
+.Fn libusb20_dev_get_speed
+returns the current speed of the given USB device.
+.
+.Bl -tag
+.It LIBUSB20_SPEED_UNKNOWN
+.It LIBUSB20_SPEED_LOW
+.It LIBUSB20_SPEED_FULL
+.It LIBUSB20_SPEED_HIGH
+.It LIBUSB20_SPEED_VARIABLE
+.It LIBUSB20_SPEED_SUPER
+.El
+.
+.Pp
+.
+.Fn libusb20_dev_get_config_index
+This function returns the currently select config index for the given
+USB device.
+.
+.Pp
+.
+.Fn libusb20_dev_free
+will free the given USB device and all associated USB
+transfers.
+.
+.Pp
+.
+.Fn libusb20_dev_set_debug
+will set the debug level for the given USB device.
+.
+.Pp
+.
+.Fn libusb20_dev_wait_process
+function will wait until a pending USB transfer has completed on
+the given USB device.
+.
+A timeout value can be specified which is passed on to the
+.Xr poll 2
+function.
+.
+.Sh USB BACKEND OPERATIONS
+.
+.Fn libusb20_be_get_template
+will return the currently selected global USB device
+side mode template into the integer pointer
+.Fa ptemp .
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_be_set_template
+will set the global USB device side mode template to
+.Fa temp .
+The new template is not activated until after the next USB
+enumeration.
+The template number decides how the USB device will present itself to
+the USB Host, like Mass Storage Device, USB Ethernet Device. Also see
+the
+.Xr usb2_template 4
+module.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+.Pp
+.
+.Fn libusb20_be_get_dev_quirk
+This function will return the device quirk according to
+.Fa index
+into the libusb20_quirk structure pointed to by
+.Fa pq .
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
+returned.
+.
+.Pp
+.
+.Fn libusb20_be_get_quirk_name
+will return the quirk name according to
+.Fa index
+into the libusb20_quirk structure pointed to by
+.Fa pq .
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
+returned.
+.
+.Pp
+.
+.Fn libusb20_be_add_dev_quirk
+will add the libusb20_quirk structure pointed to by the
+.Fa pq
+argument into the device quirk list.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+If the given quirk cannot be added LIBUSB20_ERROR_NO_MEM is
+returned.
+.
+.Pp
+.
+.Fn libusb20_be_remove_dev_quirk
+will remove the quirk matching the libusb20_quirk structure pointed to by the
+.Fa pq
+argument from the device quirk list.
+.
+This function returns zero on success else a LIBUSB20_ERROR value is
+returned.
+.
+If the given quirk does not exist LIBUSB20_ERROR_NOT_FOUND is
+returned.
+.
+.Pp
+.
+.Fn libusb20_be_alloc_default
+.Fn libusb20_be_alloc_freebsd
+.Fn libusb20_be_alloc_linux
+These functions are used to allocate a specific USB backend or the
+operating system default USB backend. Allocating a backend is a way to
+scan for currently present USB devices.
+.
+.Pp
+.
+.Fn libusb20_be_device_foreach
+is used to iterate USB devices present in a USB backend.
+.
+The starting value of
+.Fa pdev
+is NULL.
+.
+This function returns the next USB device in the list.
+.
+If NULL is returned the end of the USB device list has been reached.
+.
+.Pp
+.
+.Fn libusb20_be_dequeue_device
+will dequeue the given USB device pointer from the
+backend USB device list.
+.
+Dequeued USB devices will not be freed when the backend is freed.
+.
+.Pp
+.
+.Fn libusb20_be_enqueue_device
+This function will enqueue the given USB device pointer in the backend USB device list.
+.
+Enqueued USB devices will get freed when the backend is freed.
+.
+.Pp
+.
+.Fn libusb20_be_free
+will free the given backend and all USB devices in its device list.
+.
+.
+.Sh USB DESCRIPTOR PARSING
+.
+.Fn libusb20_me_get_1 pie offset
+This function will return a byte at the given byte offset of a message
+entity.
+.
+This function is safe against invalid offsets.
+.
+.Pp
+.
+.Fn libusb20_me_get_2 pie offset
+This function will return a little endian 16-bit value at the given byte offset of a message
+entity.
+.
+This function is safe against invalid offsets.
+.
+.Pp
+.
+.Fn libusb20_me_encode pbuf len pdecoded
+This function will encode a so-called *DECODED structure into binary
+format.
+.
+The total encoded length that will fit in the given buffer is
+returned.
+.
+If the buffer pointer is NULL no data will be written to the buffer
+location.
+.
+.Pp
+.
+.Fn libusb20_me_decode pbuf len pdecoded
+This function will decode a binary structure into a so-called *DECODED
+structure.
+.
+The total decoded length is returned.
+.
+The buffer pointer cannot be NULL.
+.
+.
+.Sh FILES
+.
+.
+/dev/usb
+.Sh SEE ALSO
+.Xr usb 4 ,
+.Xr libusb 3 ,
+.Xr usbconfig 8
+.
+.
+.Sh HISTORY
+.
+.
+Some parts of the
+.Nm
+API derives from the libusb project at sourceforge.
diff --git a/lib/libusb/libusb20_compat10.c b/lib/libusb/libusb20_compat10.c
deleted file mode 100644
index 3624485..0000000
--- a/lib/libusb/libusb20_compat10.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/* $FreeBSD$ */
-/*-
- * 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 v1.0 from sourceforge.
- */
diff --git a/lib/libusb/libusb20_compat10.h b/lib/libusb/libusb20_compat10.h
deleted file mode 100644
index d98895f..0000000
--- a/lib/libusb/libusb20_compat10.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/* $FreeBSD$ */
-/*-
- * 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.
- */