557 lines
20 KiB
Groff
557 lines
20 KiB
Groff
.\"
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.\" Copyright (c) 2009 Sylvestre Gallon
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.\"
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 7, 2012
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.Dt LIBUSB 3
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.Os
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.Sh NAME
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.Nm libusb
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.Nd "USB access library"
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.Sh LIBRARY
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USB access library
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.Pq libusb, -lusb
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.Sh SYNOPSIS
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.In libusb.h
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.Sh DESCRIPTION
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The
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.Nm
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library contains interfaces for directly managing a usb device.
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The current implementation supports v1.0 of the libusb API.
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.Sh LIBRARY INITIALISATION / DEINITIALISATION
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.Ft int
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.Fn libusb_init libusb_context **ctx
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This function initialises libusb.
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It must be called at the beginning
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of the program, before other libusb routines are used.
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This function returns 0 on success or LIBUSB_ERROR on
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failure.
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.Pp
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.Ft void
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.Fn libusb_exit "libusb_context *ctx"
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Deinitialise libusb.
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Must be called at the end of the application.
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Other libusb routines may not be called after this function.
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.Pp
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.Ft const char *
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.Fn libusb_strerror "int code"
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Get the ASCII representation of the error given by the
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.Fa code
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argument.
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This function does not return NULL.
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.Pp
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.Ft const char *
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.Fn libusb_error_name "int code"
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Get the ASCII representation of the error enum given by the
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.Fa code
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argument.
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This function does not return NULL.
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.Pp
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.Ft void
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.Fn libusb_set_debug "libusb_context *ctx" "int level"
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Set the debug level to
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.Fa level .
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.Pp
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.Ft ssize_t
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.Fn libusb_get_device_list "libusb_context *ctx" "libusb_device ***list"
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Populate
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.Fa list
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with the list of usb devices available, adding a reference to each
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device in the list.
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All the list entries created by this
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function must have their reference counter
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decremented when you are done with them,
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and the list itself must be freed.
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This
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function returns the number of devices in the list or a LIBUSB_ERROR code.
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.Pp
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.Ft void
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.Fn libusb_free_device_list "libusb_device **list" "int unref_devices"
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Free the list of devices discovered by libusb_get_device_list.
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If
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.Fa unref_device
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is set to 1 all devices in the list have their reference
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counter decremented once.
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.Pp
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.Ft uint8_t
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.Fn libusb_get_bus_number "libusb_device *dev"
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Returns the number of the bus contained by the device
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.Fa dev.
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.Pp
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.Ft uint8_t
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.Fn libusb_get_device_address "libusb_device *dev"
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Returns the device_address contained by the device
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.Fa dev.
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.Pp
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.Ft enum libusb_speed
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.Fn libusb_get_device_speed "libusb_device *dev"
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Returns the wire speed at which the device is connected.
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See the LIBUSB_SPEED_XXX enums for more information.
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LIBUSB_SPEED_UNKNOWN is returned in case of unknown wire speed.
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.Pp
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.Ft int
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.Fn libusb_get_max_packet_size "libusb_device *dev" "unsigned char endpoint"
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Returns the wMaxPacketSize value on success, LIBUSB_ERROR_NOT_FOUND if the
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endpoint does not exist and LIBUSB_ERROR_OTHERS on other failure.
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.Pp
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.Ft int
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.Fn libusb_get_max_iso_packet_size "libusb_device *dev" "unsigned char endpoint"
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Returns the packet size multiplied by the packet multiplier on success,
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LIBUSB_ERROR_NOT_FOUND if the endpoint does not exist and
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LIBUSB_ERROR_OTHERS on other failure.
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.Pp
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.Ft libusb_device *
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.Fn libusb_ref_device "libusb_device *dev"
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Increment the reference counter of the device
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.Fa dev.
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.Pp
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.Ft void
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.Fn libusb_unref_device "libusb_device *dev"
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Decrement the reference counter of the device
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.Fa dev.
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.Pp
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.Ft int
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.Fn libusb_open "libusb_device *dev" "libusb_device_handle **devh"
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Open a device and obtain a device_handle.
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Returns 0 on success,
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LIBUSB_ERROR_NO_MEM on memory allocation problems, LIBUSB_ERROR_ACCESS
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on permissions problems, LIBUSB_ERROR_NO_DEVICE if the device has been
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disconnected and a LIBUSB_ERROR code on other errors.
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.Pp
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.Ft libusb_device_handle *
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.Fn libusb_open_device_with_vid_pid "libusb_context *ctx" "uint16_t vid" "uint16_t pid"
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A convenience function to open a device by vendor and product IDs
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.Fa vid
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and
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.Fa pid.
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Returns NULL on error.
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.Pp
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.Ft void
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.Fn libusb_close "libusb_device_handle *devh"
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Close a device handle.
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.Pp
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.Ft libusb_device *
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.Fn libusb_get_device "libusb_device_handle *devh"
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Get the device contained by devh.
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Returns NULL on error.
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.Pp
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.Ft int
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.Fn libusb_get_configuration "libusb_device_handle *devh" "int *config"
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Returns the bConfiguration value of the current configuration.
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Returns 0
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on success, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
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and a LIBUSB_ERROR code on error.
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.Pp
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.Ft int
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.Fn libusb_set_configuration "libusb_device_handle *devh" "int config"
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Set the active configuration to
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.Fa config
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for the device contained by
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.Fa devh.
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This function returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the requested
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configuration does not exist, LIBUSB_ERROR_BUSY if the interfaces are currently
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claimed, LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and a
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LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_claim_interface "libusb_device_handle *devh" "int interface_number"
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Claim an interface in a given libusb_handle
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.Fa devh.
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This is a non-blocking function.
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It returns 0 on success, LIBUSB_ERROR_NOT_FOUND
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if the requested interface does not exist, LIBUSB_ERROR_BUSY if a program or
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driver has claimed the interface, LIBUSB_ERROR_NO_DEVICE if the device has
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been disconnected and a LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_release_interface "libusb_device_handle *devh" "int interface_number"
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This function releases an interface.
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All the claimed interfaces on a device must be released
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before closing the device.
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Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the
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interface was not claimed, LIBUSB_ERROR_NO_DEVICE if the device has been
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disconnected and LIBUSB_ERROR on failure.
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.Pp
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.Ft int
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.Fn libusb_set_interface_alt_setting "libusb_device_handle *dev" "int interface_number" "int alternate_setting"
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Activate an alternate setting for an interface.
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Returns 0 on success,
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LIBUSB_ERROR_NOT_FOUND if the interface was not claimed or the requested
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setting does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been
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disconnected and a LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_clear_halt "libusb_device_handle *devh" "unsigned char endpoint"
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Clear an halt/stall for a endpoint.
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Returns 0 on success, LIBUSB_ERROR_NOT_FOUND
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if the endpoint does not exist, LIBUSB_ERROR_NO_DEVICE if the device has been
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disconnected and a LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_reset_device "libusb_device_handle *devh"
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Perform an USB port reset for an usb device.
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Returns 0 on success,
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LIBUSB_ERROR_NOT_FOUND if re-enumeration is required or if the device has
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been disconnected and a LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_check_connected "libusb_device_handle *devh"
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Test if the USB device is still connected.
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Returns 0 on success,
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LIBUSB_ERROR_NO_DEVICE if it has been disconnected and a LIBUSB_ERROR
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code on failure.
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.Pp
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.Ft int
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.Fn libusb_kernel_driver_active "libusb_device_handle *devh" "int interface"
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Determine if a driver is active on a interface.
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Returns 0 if no kernel driver is active
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and 1 if a kernel driver is active, LIBUSB_ERROR_NO_DEVICE
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if the device has been disconnected and a LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_get_driver "libusb_device_handle *devh" "int interface" "char *name" "int namelen"
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or
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.Ft int
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.Fn libusb_get_driver_np "libusb_device_handle *devh" "int interface" "char *name" "int namelen"
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Copy the name of the driver attached to the given
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.Fa device
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and
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.Fa interface
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into the buffer
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.Fa name
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of length
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.Fa namelen .
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Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if no kernel driver is attached
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to the given interface and LIBUSB_ERROR_INVALID_PARAM if the interface does
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not exist.
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This function is non-portable.
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The buffer pointed to by
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.Fa name
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is only zero terminated on success.
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.Pp
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.Ft int
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.Fn libusb_detach_kernel_driver "libusb_device_handle *devh" "int interface"
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or
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.Ft int
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.Fn libusb_detach_kernel_driver_np "libusb_device_handle *devh" "int interface"
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Detach a kernel driver from an interface.
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This is needed to claim an interface already claimed by a kernel driver.
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Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if no kernel driver was active,
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LIBUSB_ERROR_INVALID_PARAM if the interface does not exist,
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LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
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and a LIBUSB_ERROR code on failure.
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This function is non-portable.
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.Pp
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.Ft int
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.Fn libusb_attach_kernel_driver "libusb_device_handle *devh" "int interface"
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Re-attach an interface kernel driver that was previously detached.
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Returns 0 on success,
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LIBUSB_ERROR_INVALID_PARAM if the interface does not exist,
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LIBUSB_ERROR_NO_DEVICE
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if the device has been disconnected, LIBUSB_ERROR_BUSY if the driver cannot be
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attached because the interface is claimed by a program or driver and a
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LIBUSB_ERROR code on failure.
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.Sh USB DESCRIPTORS
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.Ft int
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.Fn libusb_get_device_descriptor "libusb_device *dev" "libusb_device_descriptor *desc"
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Get the USB device descriptor for the device
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.Fa dev.
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This is a non-blocking function.
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Returns 0 on success and a LIBUSB_ERROR code on
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failure.
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.Pp
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.Ft int
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.Fn libusb_get_active_config_descriptor "libusb_device *dev" "struct libusb_config_descriptor **config"
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Get the USB configuration descriptor for the active configuration.
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Returns 0 on
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success, LIBUSB_ERROR_NOT_FOUND if the device is in
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an unconfigured state
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and a LIBUSB_ERROR code on error.
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.Pp
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.Ft int
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.Fn libusb_get_config_descriptor "libusb_device *dev" "uint8_t config_index" "libusb_config_descriptor **config"
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Get a USB configuration descriptor based on its index
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.Fa idx.
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Returns 0 on success, LIBUSB_ERROR_NOT_FOUND if the configuration does not exist
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and a LIBUSB_ERROR code on error.
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.Pp
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.Ft int
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.Fn libusb_get_config_descriptor_by_value "libusb_device *dev" "uint8 bConfigurationValue" "libusb_config_descriptor **config"
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Get a USB configuration descriptor with a specific bConfigurationValue.
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This is
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a non-blocking function which does not send a request through the device.
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Returns 0
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on success, LIBUSB_ERROR_NOT_FOUND if the configuration
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does not exist and a
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LIBUSB_ERROR code on failure.
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.Pp
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.Ft void
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.Fn libusb_free_config_descriptor "libusb_config_descriptor *config"
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Free a configuration descriptor.
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.Pp
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.Ft int
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.Fn libusb_get_string_descriptor "libusb_device_handle *devh" "uint8_t desc_idx" "uint16_t langid" "unsigned char *data" "int length"
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Retrieve a string descriptor in raw format.
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Returns the number of bytes actually transferred on success
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or a negative LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_get_string_descriptor_ascii "libusb_device_handle *devh" "uint8_t desc_idx" "unsigned char *data" "int length"
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Retrieve a string descriptor in C style ASCII.
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Returns the positive number of bytes in the resulting ASCII string
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on success and a LIBUSB_ERROR code on failure.
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.Pp
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.Ft int
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.Fn libusb_parse_ss_endpoint_comp "const void *buf" "int len" "libusb_ss_endpoint_companion_descriptor **ep_comp"
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This function parses the USB 3.0 endpoint companion descriptor in host endian format pointed to by
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.Fa buf
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and having a length of
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.Fa len.
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Typically these arguments are the extra and extra_length fields of the
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endpoint descriptor.
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On success the pointer to resulting descriptor is stored at the location given by
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.Fa ep_comp.
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Returns zero on success and a LIBUSB_ERROR code on failure.
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On success the parsed USB 3.0 endpoint companion descriptor must be
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freed using the libusb_free_ss_endpoint_comp function.
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.Pp
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.Ft void
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.Fn libusb_free_ss_endpoint_comp "libusb_ss_endpoint_companion_descriptor *ep_comp"
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This function is NULL safe and frees a parsed USB 3.0 endpoint companion descriptor.
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.Pp
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.Ft int
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.Fn libusb_parse_bos_descriptor "const void *buf" "int len" "libusb_bos_descriptor **bos"
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This function parses a Binary Object Store, BOS, descriptor into host endian format pointed to by
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.Fa buf
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and having a length of
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.Fa len.
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On success the pointer to resulting descriptor is stored at the location given by
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.Fa bos.
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Returns zero on success and a LIBUSB_ERROR code on failure.
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On success the parsed BOS descriptor must be freed using the
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libusb_free_bos_descriptor function.
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.Pp
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.Ft void
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.Fn libusb_free_bos_descriptor "libusb_bos_descriptor *bos"
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This function is NULL safe and frees a parsed BOS descriptor.
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.Sh USB ASYNCHRONOUS I/O
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.Ft struct libusb_transfer *
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.Fn libusb_alloc_transfer "int iso_packets"
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Allocate a transfer with the number of isochronous packet descriptors
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specified by
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.Fa iso_packets .
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Returns NULL on error.
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.Pp
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.Ft void
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.Fn libusb_free_transfer "struct libusb_transfer *tr"
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Free a transfer.
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.Pp
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.Ft int
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.Fn libusb_submit_transfer "struct libusb_transfer *tr"
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This function will submit a transfer and returns immediately.
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Returns 0 on success, LIBUSB_ERROR_NO_DEVICE if
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the device has been disconnected and a
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LIBUSB_ERROR code on other failure.
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.Pp
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.Ft int
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.Fn libusb_cancel_transfer "struct libusb_transfer *tr"
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This function asynchronously cancels a transfer.
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Returns 0 on success and a LIBUSB_ERROR code on failure.
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.Sh USB SYNCHRONOUS I/O
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.Ft int
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.Fn libusb_control_transfer "libusb_device_handle *devh" "uint8_t bmRequestType" "uint8_t bRequest" "uint16_t wValue" "uint16_t wIndex" "unsigned char *data" "uint16_t wLength" "unsigned int timeout"
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Perform a USB control transfer.
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Returns the actual number of bytes
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transferred on success, in the range from and including zero up to and
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including
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.Fa wLength .
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On error a LIBUSB_ERROR code is returned, for example
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LIBUSB_ERROR_TIMEOUT if the transfer timed out, LIBUSB_ERROR_PIPE if the
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control request was not supported, LIBUSB_ERROR_NO_DEVICE if the
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device has been disconnected and another LIBUSB_ERROR code on other failures.
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The LIBUSB_ERROR codes are all negative.
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.Pp
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.Ft int
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.Fn libusb_bulk_transfer "struct libusb_device_handle *devh" "unsigned char endpoint" "unsigned char *data" "int length" "int *transferred" "unsigned int timeout"
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Perform an USB bulk transfer.
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A timeout value of zero means no timeout.
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The timeout value is given in milliseconds.
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Returns 0 on success, LIBUSB_ERROR_TIMEOUT
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if the transfer timed out, LIBUSB_ERROR_PIPE if the control request was not
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supported, LIBUSB_ERROR_OVERFLOW if the device offered more data,
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LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and
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a LIBUSB_ERROR code on other failure.
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.Pp
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.Ft int
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.Fn libusb_interrupt_transfer "struct libusb_device_handle *devh" "unsigned char endpoint" "unsigned char *data" "int length" "int *transferred" "unsigned int timeout"
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Perform an USB Interrupt transfer.
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A timeout value of zero means no timeout.
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The timeout value is given in milliseconds.
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Returns 0 on success, LIBUSB_ERROR_TIMEOUT
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if the transfer timed out, LIBUSB_ERROR_PIPE if the control request was not
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supported, LIBUSB_ERROR_OVERFLOW if the device offered more data,
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LIBUSB_ERROR_NO_DEVICE if the device has been disconnected and
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a LIBUSB_ERROR code on other failure.
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.Sh USB EVENTS
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.Ft int
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.Fn libusb_try_lock_events "libusb_context *ctx"
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Try to acquire the event handling lock.
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Returns 0 if the lock was obtained and 1 if not.
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.Pp
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.Ft void
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.Fn libusb_lock_events "libusb_context *ctx"
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Acquire the event handling lock.
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This function is blocking.
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.Pp
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.Ft void
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.Fn libusb_unlock_events "libusb_context *ctx"
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Release the event handling lock.
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This will wake up any thread blocked
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on
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.Fn libusb_wait_for_event .
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.Pp
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.Ft int
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.Fn libusb_event_handling_ok "libusb_context *ctx"
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Determine if it still OK for this thread to be doing event handling.
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Returns 1
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if event handling can start or continue.
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Returns 0 if this thread must give up
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the events lock.
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.Pp
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.Ft int
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.Fn libusb_event_handler_active "libusb_context *ctx"
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Determine if an active thread is handling events.
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Returns 1 if there is a thread handling events and 0 if there
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are no threads currently handling events.
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.Pp
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.Ft void
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.Fn libusb_lock_event_waiters "libusb_context *ctx"
|
|
Acquire the event_waiters lock.
|
|
This lock is designed to be obtained in 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
|
|
.Ft void
|
|
.Fn libusb_unlock_event_waiters "libusb_context *ctx"
|
|
Release the event_waiters lock.
|
|
.Pp
|
|
.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, and 1 if the
|
|
timeout expired.
|
|
.Pp
|
|
.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
|
|
.Ft int
|
|
.Fn libusb_handle_events "libusb_context *ctx"
|
|
Handle any pending events in blocking mode with a sensible timeout.
|
|
Returns 0
|
|
on success and a LIBUSB_ERROR code on failure.
|
|
.Pp
|
|
.Ft int
|
|
.Fn libusb_handle_events_locked "libusb_context *ctx" "struct timeval *tv"
|
|
Handle any pending events by polling file descriptors, without checking if
|
|
another thread is already doing so.
|
|
Must be called with the event lock held.
|
|
.Pp
|
|
.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 a LIBUSB_ERROR
|
|
code on failure.
|
|
.Pp
|
|
.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.
|
|
.Sh LIBUSB VERSION 0.1 COMPATIBILITY
|
|
The library is also compliant with LibUSB version 0.1.12.
|
|
.Pp
|
|
.Fn usb_open
|
|
.Fn usb_close
|
|
.Fn usb_get_string
|
|
.Fn usb_get_string_simple
|
|
.Fn usb_get_descriptor_by_endpoint
|
|
.Fn usb_get_descriptor
|
|
.Fn usb_parse_descriptor
|
|
.Fn usb_parse_configuration
|
|
.Fn usb_destroy_configuration
|
|
.Fn usb_fetch_and_parse_descriptors
|
|
.Fn usb_bulk_write
|
|
.Fn usb_bulk_read
|
|
.Fn usb_interrupt_write
|
|
.Fn usb_interrupt_read
|
|
.Fn usb_control_msg
|
|
.Fn usb_set_configuration
|
|
.Fn usb_claim_interface
|
|
.Fn usb_release_interface
|
|
.Fn usb_set_altinterface
|
|
.Fn usb_resetep
|
|
.Fn usb_clear_halt
|
|
.Fn usb_reset
|
|
.Fn usb_strerror
|
|
.Fn usb_init
|
|
.Fn usb_set_debug
|
|
.Fn usb_find_busses
|
|
.Fn usb_find_devices
|
|
.Fn usb_device
|
|
.Fn usb_get_busses
|
|
.Fn usb_check_connected
|
|
.Fn usb_get_driver_np
|
|
.Fn usb_detach_kernel_driver_np
|
|
.Sh SEE ALSO
|
|
.Xr libusb20 3 ,
|
|
.Xr usb 4 ,
|
|
.Xr usbconfig 8 ,
|
|
.Xr usbdump 8
|
|
.Pp
|
|
.Pa http://libusb.sourceforge.net/
|
|
.Sh HISTORY
|
|
.Nm
|
|
support first appeared in
|
|
.Fx 8.0 .
|