992 lines
26 KiB
Groff
992 lines
26 KiB
Groff
.\"
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.\" Copyright (c) 2008 Hans Petter Selasky
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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 October 14, 2010
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.Dt LIBUSB20 3
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.Os
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.Sh NAME
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.Nm libusb20
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.
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.Nd "USB access library"
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.
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.
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.Sh LIBRARY
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.
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.
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USB access library (libusb -lusb)
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.
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.
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.
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.Sh SYNOPSIS
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.In libusb20.h
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.Ft int
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.Fn libusb20_tr_close "struct libusb20_transfer *xfer"
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.Ft int
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.Fn libusb20_tr_open "struct libusb20_transfer *xfer" "uint32_t max_buf_size" "uint32_t max_frame_count" "uint8_t ep_no"
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.Ft struct libusb20_transfer*
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.Fn libusb20_tr_get_pointer "struct libusb20_device *pdev" "uint16_t tr_index"
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.Ft uint16_t
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.Fn libusb20_tr_get_time_complete "struct libusb20_transfer *xfer"
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.Ft uint32_t
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.Fn libusb20_tr_get_actual_frames "struct libusb20_transfer *xfer"
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.Ft uint32_t
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.Fn libusb20_tr_get_actual_length "struct libusb20_transfer *xfer"
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.Ft uint32_t
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.Fn libusb20_tr_get_max_frames "struct libusb20_transfer *xfer"
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.Ft uint32_t
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.Fn libusb20_tr_get_max_packet_length "struct libusb20_transfer *xfer"
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.Ft uint32_t
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.Fn libusb20_tr_get_max_total_length "struct libusb20_transfer *xfer"
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.Ft uint8_t
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.Fn libusb20_tr_get_status "struct libusb20_transfer *xfer"
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.Ft uint8_t
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.Fn libusb20_tr_pending "struct libusb20_transfer *xfer"
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.Ft void
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.Fn libusb20_tr_callback_wrapper "struct libusb20_transfer *xfer"
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.Ft void
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.Fn libusb20_tr_clear_stall_sync "struct libusb20_transfer *xfer"
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.Ft void
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.Fn libusb20_tr_drain "struct libusb20_transfer *xfer"
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.Ft void
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.Fn libusb20_tr_set_buffer "struct libusb20_transfer *xfer" "void *buffer" "uint16_t fr_index"
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.Ft void
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.Fn libusb20_tr_set_callback "struct libusb20_transfer *xfer" "libusb20_tr_callback_t *cb"
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.Ft void
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.Fn libusb20_tr_set_flags "struct libusb20_transfer *xfer" "uint8_t flags"
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.Ft uint32_t
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.Fn libusb20_tr_get_length "struct libusb20_transfer *xfer" "uint16_t fr_index"
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.Ft void
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.Fn libusb20_tr_set_length "struct libusb20_transfer *xfer" "uint32_t length" "uint16_t fr_index"
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.Ft void
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.Fn libusb20_tr_set_priv_sc0 "struct libusb20_transfer *xfer" "void *sc0"
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.Ft void
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.Fn libusb20_tr_set_priv_sc1 "struct libusb20_transfer *xfer" "void *sc1"
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.Ft void
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.Fn libusb20_tr_set_timeout "struct libusb20_transfer *xfer" "uint32_t timeout"
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.Ft void
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.Fn libusb20_tr_set_total_frames "struct libusb20_transfer *xfer" "uint32_t nframes"
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.Ft void
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.Fn libusb20_tr_setup_bulk "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t timeout"
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.Ft void
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.Fn libusb20_tr_setup_control "struct libusb20_transfer *xfer" "void *psetup" "void *pbuf" "uint32_t timeout"
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.Ft void
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.Fn libusb20_tr_setup_intr "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t timeout"
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.Ft void
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.Fn libusb20_tr_setup_isoc "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint61_t fr_index"
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.Ft uint8_t
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.Fn libusb20_tr_bulk_intr_sync "struct libusb20_transfer *xfer" "void *pbuf" "uint32_t length" "uint32_t *pactlen" "uint32_t timeout"
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.Ft void
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.Fn libusb20_tr_start "struct libusb20_transfer *xfer"
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.Ft void
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.Fn libusb20_tr_stop "struct libusb20_transfer *xfer"
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.Ft void
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.Fn libusb20_tr_submit "struct libusb20_transfer *xfer"
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.Ft void *
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.Fn libusb20_tr_get_priv_sc0 "struct libusb20_transfer *xfer"
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.Ft void *
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.Fn libusb20_tr_get_priv_sc1 "struct libusb20_transfer *xfer"
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.Ft const char *
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.Fn libusb20_dev_get_backend_name "struct libusb20_device *"
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.Ft int
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.Fn libusb20_dev_get_info "struct libusb20_device *pdev" "struct usb_device_info *pinfo"
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.Ft int
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.Fn libusb20_dev_get_iface_desc "struct libusb20_device *pdev" "uint8_t iface_index" "char *buf" "uint8_t len"
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.Ft const char *
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.Fn libusb20_dev_get_desc "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_close "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_detach_kernel_driver "struct libusb20_device *pdev" "uint8_t iface_index"
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.Ft int
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.Fn libusb20_dev_set_config_index "struct libusb20_device *pdev" "uint8_t configIndex"
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.Ft int
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.Fn libusb20_dev_get_debug "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_get_fd "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_kernel_driver_active "struct libusb20_device *pdev" "uint8_t iface_index"
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.Ft int
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.Fn libusb20_dev_open "struct libusb20_device *pdev" "uint16_t transfer_max"
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.Ft int
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.Fn libusb20_dev_process "struct libusb20_device *pdev"
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.Ft int
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.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"
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.Ft int
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.Fn libusb20_dev_req_string_sync "struct libusb20_device *pdev" "uint8_t index" "uint16_t langid" "void *ptr" "uint16_t len"
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.Ft int
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.Fn libusb20_dev_req_string_simple_sync "struct libusb20_device *pdev" "uint8_t index" "void *ptr" "uint16_t len"
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.Ft int
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.Fn libusb20_dev_reset "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_check_connected "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_set_power_mode "struct libusb20_device *pdev" "uint8_t power_mode"
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.Ft uint8_t
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.Fn libusb20_dev_get_power_mode "struct libusb20_device *pdev"
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.Ft int
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.Fn libusb20_dev_set_alt_index "struct libusb20_device *pdev" "uint8_t iface_index" "uint8_t alt_index"
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.Ft struct LIBUSB20_DEVICE_DESC_DECODED *
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.Fn libusb20_dev_get_device_desc "struct libusb20_device *pdev"
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.Ft struct libusb20_config *
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.Fn libusb20_dev_alloc_config "struct libusb20_device *pdev" "uint8_t config_index"
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.Ft struct libusb20_device *
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.Fn libusb20_dev_alloc "void"
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.Ft uint8_t
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.Fn libusb20_dev_get_address "struct libusb20_device *pdev"
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.Ft uint8_t
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.Fn libusb20_dev_get_bus_number "struct libusb20_device *pdev"
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.Ft uint8_t
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.Fn libusb20_dev_get_mode "struct libusb20_device *pdev"
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.Ft uint8_t
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.Fn libusb20_dev_get_speed "struct libusb20_device *pdev"
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.Ft uint8_t
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.Fn libusb20_dev_get_config_index "struct libusb20_device *pdev"
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.Ft void
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.Fn libusb20_dev_free "struct libusb20_device *pdev"
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.Ft void
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.Fn libusb20_dev_set_debug "struct libusb20_device *pdev" "int debug"
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.Ft void
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.Fn libusb20_dev_wait_process "struct libusb20_device *pdev" "int timeout"
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.Ft int
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.Fn libusb20_be_get_template "struct libusb20_backend *pbe" "int *ptemp"
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.Ft int
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.Fn libusb20_be_set_template "struct libusb20_backend *pbe" "int temp"
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.Ft int
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.Fn libusb20_be_get_dev_quirk "struct libusb20_backend *pber" "uint16_t index" "struct libusb20_quirk *pq"
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.Ft int
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.Fn libusb20_be_get_quirk_name "struct libusb20_backend *pbe" "uint16_t index" "struct libusb20_quirk *pq"
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.Ft int
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.Fn libusb20_be_add_dev_quirk "struct libusb20_backend *pbe" "struct libusb20_quirk *pq"
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.Ft int
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.Fn libusb20_be_remove_dev_quirk "struct libusb20_backend *pbe" "struct libusb20_quirk *pq"
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.Ft struct libusb20_backend *
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.Fn libusb20_be_alloc_default "void"
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.Ft struct libusb20_backend *
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.Fn libusb20_be_alloc_freebsd "void"
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.Ft struct libusb20_backend *
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.Fn libusb20_be_alloc_linux "void"
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.Ft struct libusb20_device *
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.Fn libusb20_be_device_foreach "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
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.Ft void
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.Fn libusb20_be_dequeue_device "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
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.Ft void
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.Fn libusb20_be_enqueue_device "struct libusb20_backend *pbe" "struct libusb20_device *pdev"
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.Ft void
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.Fn libusb20_be_free "struct libusb20_backend *pbe"
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.Ft uint8_t
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.Fn libusb20_me_get_1 "const struct libusb20_me_struct *me" "uint16_t off"
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.Ft uint16_t
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.Fn libusb20_me_get_2 "const struct libusb20_me_struct *me" "uint16_t off"
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.Ft uint16_t
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.Fn libusb20_me_encode "void *pdata" "uint16_t len" "const void *pdecoded"
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.Ft uint16_t
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.Fn libusb20_me_decode "const void *pdata" "uint16_t len" "void *pdecoded"
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.Ft "const uint8_t *"
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.Fn libusb20_desc_foreach "const struct libusb20_me_struct *me" "const uint8_t *pdesc"
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.
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.
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.Sh DESCRIPTION
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.
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The
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.Nm
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library implements functions to be able to easily access and control
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USB through the USB file system interface.
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The
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.Nm
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interfaces are specific to the
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.Fx
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usb stack and are not available on other operating systems, portable
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applications should consider using
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.Xr libusb 3 .
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.
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.
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.Sh USB TRANSFER OPERATIONS
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.
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.Pp
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.
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.Fn libusb20_tr_close
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will release all kernel resources associated with an USB
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.Fa xfer .
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.
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This function returns zero upon success.
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.
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Non-zero return values indicate a LIBUSB20_ERROR value.
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.
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.Pp
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.
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.Fn libusb20_tr_open
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will allocate kernel buffer resources according to
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.Fa max_buf_size
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and
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.Fa max_frame_count
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associated with an USB
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.Fa pxfer
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and bind the transfer to the specified
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.Fa ep_no .
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.Fa max_buf_size
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is the minimum buffer size which the data transport layer has to support.
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If
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.Fa max_buf_size
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is zero, the
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.Nm
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library will use wMaxPacketSize to compute the buffer size.
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This can be useful for isochronous transfers.
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The actual buffer size can be greater than
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.Fa max_buf_size
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and is returned by
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.Fn libusb20_tr_get_max_total_length .
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.
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If
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.Fa max_frame_count
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is OR'ed with LIBUSB20_MAX_FRAME_PRE_SCALE the remaining part of the
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argument is converted from milliseconds into the actual number of
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frames rounded up, when this function returns.
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This flag is only valid for ISOCHRONOUS transfers and has no effect
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for other transfer types.
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The actual number of frames setup is found by calling
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.Fn libusb20_tr_get_max_frames .
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.
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This function returns zero upon success.
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.
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Non-zero return values indicate a LIBUSB20_ERROR value.
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.
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.Pp
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.
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.Fn libusb20_tr_get_pointer
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will return a pointer to the allocated USB transfer according to the
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.Fa pdev
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and
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.Fa tr_index
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arguments.
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.
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This function returns NULL in case of failure.
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.
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.Pp
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.
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.Fn libusb20_tr_get_time_complete
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will return the completion time of an USB transfer in
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millisecond units. This function is most useful for isochronous USB
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transfers when doing echo cancelling.
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.
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.Pp
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.
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.Fn libusb20_tr_get_actual_frames
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will return the actual number of USB frames after an USB
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transfer completed. A value of zero means that no data was transferred.
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.
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.Pp
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.
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.Fn libusb20_tr_get_actual_length
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will return the sum of the actual length for all
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transferred USB frames for the given USB transfer.
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.
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.Pp
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.
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.Fn libusb20_tr_get_max_frames
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will return the maximum number of USB frames that were
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allocated when an USB transfer was setup for the given USB transfer.
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.
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.Pp
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.
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.Fn libusb20_tr_get_max_packet_length
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will return the maximum packet length in bytes
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associated with the given USB transfer.
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.
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The packet length can be used round up buffer sizes so that short USB
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packets are avoided for proxy buffers.
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.
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.
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.Pp
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.
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.Fn libusb20_tr_get_max_total_length
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function will return the maximum value for the data length sum of all USB
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frames associated with an USB transfer.
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In case of control transfers the value returned does not include the
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length of the SETUP packet, 8 bytes, which is part of frame zero.
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The returned value of this function is always aligned to the maximum
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packet size, wMaxPacketSize, of the endpoint which the USB transfer is
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bound to.
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.
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.Pp
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.
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.Fn libusb20_tr_get_status
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will return the status of an USB transfer.
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.
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Status values are defined by a set of LIBUSB20_TRANSFER_XXX enums.
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.
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.Pp
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.
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.Fn libusb20_tr_pending
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will return non-zero if the given USB transfer is
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pending for completion.
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.
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Else this function returns zero.
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.
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.Pp
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.
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.Fn libusb20_tr_callback_wrapper
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This is an internal function used to wrap asynchronous USB callbacks.
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.
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.Pp
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.
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.Fn libusb20_tr_clear_stall_sync
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This is an internal function used to synchronously clear the stall on
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the given USB transfer.
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.
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Please see the USB specification for more information on stall
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clearing.
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.
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If the given USB transfer is pending when this function is called, the
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USB transfer will complete with an error after that this function has
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been called.
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.
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.Pp
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.
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.Fn libusb20_tr_drain
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will stop the given USB transfer and will not return
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until the USB transfer has been stopped in hardware.
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.
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.Pp
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.
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.Fn libusb20_tr_set_buffer
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is used to set the
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.Fa buffer
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pointer for the given USB transfer and
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.Fa fr_index .
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.
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Typically the frame index is zero.
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.
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.
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.Pp
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.
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.Fn libusb20_tr_set_callback
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|
is used to set the USB callback for asynchronous USB
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transfers.
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.
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The callback type is defined by libusb20_tr_callback_t.
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.
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.Pp
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.
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.Fn libusb20_tr_set_flags
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is used to set various USB flags for the given USB transfer.
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.Bl -tag
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.It LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK
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Report a short frame as error.
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.It LIBUSB20_TRANSFER_MULTI_SHORT_NOT_OK
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Multiple short frames are not allowed.
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.It LIBUSB20_TRANSFER_FORCE_SHORT
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All transmitted frames are short terminated.
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.It LIBUSB20_TRANSFER_DO_CLEAR_STALL
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Will do a clear-stall before starting the transfer.
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.El
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.
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.Pp
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.
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.Fn libusb20_tr_get_length
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returns the length of the given USB frame by index.
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After an USB transfer is complete the USB frame length will get updated to the actual transferred length.
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.
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.Pp
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.
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.Fn libusb20_tr_set_length
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sets the length of the given USB frame by index.
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.
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.Pp
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.
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.Fn libusb20_tr_set_priv_sc0
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sets private driver pointer number zero.
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.
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.Pp
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.
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.Fn libusb20_tr_set_priv_sc1
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sets private driver pointer number one.
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.
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.Pp
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.
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.Fn libusb20_tr_set_timeout
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|
sets the timeout for the given USB transfer.
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.
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A timeout value of zero means no timeout.
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.
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The timeout is given in milliseconds.
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.
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.Pp
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.
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.Fn libusb20_tr_set_total_frames
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|
sets the total number of frames that should be executed when the USB transfer is submitted.
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.
|
|
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_bulk_intr_sync
|
|
will perform a synchronous BULK or INTERRUPT transfer having length given by the
|
|
.Fa length
|
|
argument and buffer pointer given by the
|
|
.Fa pbuf
|
|
argument on the USB transfer given by the
|
|
.Fa xfer
|
|
argument.
|
|
.
|
|
If the
|
|
.Fa pactlen
|
|
argument is non-NULL the actual transfer length will be stored at the given pointer destination.
|
|
.
|
|
If the
|
|
.Fa timeout
|
|
argument is non-zero the transfer will timeout after the given value in milliseconds.
|
|
.
|
|
This function does not change the transfer flags, like short packet not ok.
|
|
.
|
|
This function returns zero on success else a LIBUSB20_TRANSFER_XXX value is returned.
|
|
.
|
|
.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
|
|
retrieves 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_check_connected
|
|
will check if an opened USB device is still connected.
|
|
.
|
|
This function returns zero if the device is still connected 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.
|