.\"	$NetBSD: usbdi.9,v 1.18 2012/06/02 23:33:16 mrg Exp $
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.\" Copyright (c) 2012 Matthew R. Green
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Lennart Augustsson.
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.Dd June 2, 2012
.Dt USBDI 9
.Os
.Sh NAME
.Nm usbdi
.Nd USB device drivers interface
.Sh SYNOPSIS
.In dev/usb/usb.h
.In dev/usb/usbdi.h
.In dev/usb/usbdi_util.h
.Ss Functions offered by usbdi.h
.Ft usbd_status
.Fn usbd_open_pipe "usbd_interface_handle iface" "uint8_t address" \
 "uint8_t flags" "usbd_pipe_handle *pipe"
.Ft usbd_status
.Fn usbd_close_pipe "usbd_pipe_handle pipe"
.Ft usbd_status
.Fn usbd_transfer "usbd_xfer_handle xfer"
.Ft usbd_xfer_handle
.Fn usbd_alloc_xfer "usbd_device_handle dev"
.Ft usbd_status
.Fn usbd_free_xfer "usbd_xfer_handle xfer"
.Ft void
.Fn usbd_setup_xfer "usbd_xfer_handle xfer" "usbd_pipe_handle pipe" \
 "usbd_private_handle priv" "void *buffer" "uint32_t length" \
 "uint16_t flags" "uint32_t timeout" "usbd_callback"
.Ft void
.Fn usbd_setup_default_xfer "usbd_xfer_handle xfer" \
 "usbd_device_handle dev" "usbd_private_handle priv" \
 "uint32_t timeout" "usb_device_request_t *req" " void *buffer" \
 "uint32_t length" "uint16_t flags" "usbd_callback"
.Ft void
.Fn usbd_setup_isoc_xfer "usbd_xfer_handle xfer" "usbd_pipe_handle pipe" \
 "usbd_private_handle priv" "uint16_t *frlengths" \
 "uint32_t nframes" "uint16_t flags" "usbd_callback"
.Ft void
.Fn usbd_get_xfer_status "usbd_xfer_handle xfer" "usbd_private_handle *priv" \
 "void **buffer" "uint32_t *count" "usbd_status *status"
.Ft usb_endpoint_descriptor_t *
.Fn usbd_interface2endpoint_descriptor "usbd_interface_handle iface" \
 "uint8_t address"
.Ft usbd_status
.Fn usbd_abort_pipe "usbd_pipe_handle pipe"
.Ft usbd_status
.Fn usbd_abort_default_pipe "usbd_device_handle dev"
.Ft usbd_status
.Fn usbd_clear_endpoint_stall "usbd_pipe_handle pipe"
.Ft usbd_status
.Fn usbd_clear_endpoint_stall_async "usbd_pipe_handle pipe"
.Ft void
.Fn usbd_clear_endpoint_toggle "usbd_pipe_handle pipe"
.Ft usbd_status
.Fn usbd_endpoint_count "usbd_interface_handle dev" "uint8_t *count"
.Ft usbd_status
.Fn usbd_interface_count "usbd_device_handle dev" "uint8_t *count"
.Ft usbd_status
.Fn usbd_interface2device_handle "usbd_interface_handle iface" "usbd_device_handle *dev"
.Ft usbd_status
.Fn usbd_device2interface_handle "usbd_device_handle dev" "uint8_t ifaceno" "usbd_interface_handle *iface"
.Pp
.Ft usbd_device_handle
.Fn usbd_pipe2device_handle "usbd_pipe_handle pipe"
.Ft void *
.Fn usbd_alloc_buffer "usbd_xfer_handle req" "uint32_t size"
.Ft void
.Fn usbd_free_buffer "usbd_xfer_handle req"
.Ft void *
.Fn usbd_get_buffer "usbd_xfer_handle xfer"
.Ft usbd_status
.Fn usbd_sync_transfer "usbd_xfer_handle req"
.\" only in usbmp
.\" .Ft usbd_status
.\" .Fn usbd_sync_transfer_sig "usbd_xfer_handle req"
.Ft usbd_status
.Fn usbd_open_pipe_intr "usbd_interface_handle iface" "uint8_t address" \
 "uint8_t flags" "usbd_pipe_handle *pipe" \
 "usbd_private_handle priv" "void *buffer" \
 "uint32_t length" "usbd_callback callback" "int interval"
.Ft usbd_status
.Fn usbd_do_request "usbd_device_handle dev" "usb_device_request_t *req" \
 "void *data"
.Ft usbd_status
.Fn usbd_do_request_flags "usbd_device_handle dev" \
 "usb_device_request_t *req" "void *data" "uint16_t flags" "int *actlen" \
 "u_int32_t timo"
.\" usbd_do_request_async() not used outside of usbdi*
.Ft usb_interface_descriptor_t *
.Fn usbd_get_interface_descriptor "usbd_interface_handle iface"
.Ft usb_config_descriptor_t *
.Fn usbd_get_config_descriptor "usbd_device_handle dev"
.Ft usb_device_descriptor_t *
.Fn usbd_get_device_descriptor "usbd_device_handle dev"
.Ft usbd_status
.Fn usbd_set_interface "usbd_interface_handle iface" "int altidx"
.Ft int
.Fn usbd_get_no_alts "usb_config_descriptor_t *iface" "int ifaceno"
.Ft usbd_status
.Fn usbd_get_interface "usbd_interface_handle iface" "uint8_t *aiface"
.Ft void
.Fn usbd_fill_deviceinfo "usbd_device_handle dev" "struct usb_device_info *di"
.Ft int
.Fn usbd_get_interface_altindex "usbd_interface_handle iface"
.Ft usb_interface_descriptor_t *
.Fn usbd_find_idesc "usb_config_descriptor_t *cd" "int iindex" "int ano"
.Ft usb_endpoint_descriptor_t *
.Fn usbd_find_edesc "usb_config_descriptor_t *cd" "int ifaceidx" "int altidx" \
 "int endptidx"
.Ft void
.Fn usbd_dopoll "usbd_interface_handle iface"
.Ft void
.Fn usbd_set_polling "usbd_device_handle iface" "int val"
.Ft const char *
.Fn usbd_errstr "usbd_status err"
.Ft void
.Fn usbd_add_dev_event "int type" "usbd_device_handle iface"
.Ft void
.Fn usbd_add_drv_event "int type" "usbd_device_handle iface" "device_t dv"
.Ft char *
.Fn usbd_devinfo_alloc "usbd_device_handle iface" "int showclass"
.Ft void
.Fn usbd_devinfo_free "char *str"
.Ft const struct usbd_quirks *
.Fn usbd_get_quirks "usbd_device_handle iface"
.Ft usb_endpoint_descriptor_t *
.Fn usbd_get_endpoint_descriptor "usbd_interface_handle dev" \
 "u_int8_t address"
.Ft usbd_status
.Fn usbd_reload_device_desc "usbd_device_handle iface"
.Ft int
.Fn usbd_ratecheck "struct timeval *tv"
.Ft usbd_status
.Fn usbd_get_string "usbd_device_handle iface" "int si" "char *buf"
.Ft usbd_status
.Fn usbd_get_string0 "usbd_device_handle iface" "int" si "char *buf" \
 "int unicode"
.Ft void
.Fn usb_desc_iter_init "usbd_device_handle iface" "usbd_desc_iter_t *iter"
.Ft const usb_descriptor_t *
.Fn usb_desc_iter_next "usbd_desc_iter_t *iter"
.Ft void
.Fn usb_add_task "usbd_device_handle iface" "struct usb_task *task" \
 "int queue"
.Ft void
.Fn usb_rem_task "usbd_device_handle iface" "struct usb_task *task"
.Ft void
.Fn usb_init_task "struct usb_task *task" "void (*func)(void *)" \
 "void *arg"
.Ft const struct usb_devno *
.Fn usb_lookup "const struct usb_devno *tbl" \
 "u_int16_t vendor" "u_int16_t product"
.Ss Utilities from usbdi_util.h
Based on the routines in
.Dv usbdi.h
a number of utility functions have been defined that are accessible
through
.Dv usbdi_util.h .
.Ft usbd_status
.Fn usbd_get_desc "usbd_device_handle dev" "int type" "int index" \
 "int len" "void *desc"
.Ft usbd_status
.Fn usbd_get_config_desc "usbd_device_handle dev" "int confidx" \
 "usb_config_descriptor_t *d"
.Ft usbd_status
.Fn usbd_get_config_desc_full "usbd_device_handle" "int dev" "void *d" "int size"
.Ft usbd_status
.Fn usbd_get_device_desc "usbd_device_handle dev" \
 "usb_device_descriptor_t *d"
.Ft usbd_status
.Fn usbd_set_address "usbd_device_handle dev" "int addr"
.Ft usbd_status
.Fn usbd_get_port_status "usbd_device_handle dev" "intp ort" "usb_port_status_t *ps"
.Ft usbd_status
.Fn usbd_set_hub_feature "usbd_device_handle dev" "int sel"
.Ft usbd_status
.Fn usbd_clear_hub_feature "usbd_device_handle dev" "int sel"
.Ft usbd_status
.Fn usbd_set_port_feature "usbd_device_handle dev" "int port" "int sel"
.Ft usbd_status
.Fn usbd_clear_port_feature "usbd_device_handle dev" "int port" "int sel"
.Ft usbd_status
.Fn usbd_get_device_status "usbd_device_handle dev" "usb_status_t *st"
.Ft usbd_status
.Fn usbd_get_hub_status "usbd_device_handle dev" "usb_hub_status_t *st"
.Ft usbd_status
.Fn usbd_set_protocol "usbd_interface_handle dev" "int report"
.Ft usbd_status
.Fn usbd_get_report_descriptor  "usbd_device_handle dev" "int ifcno" "int repid" "int size" "void *d"
.Ft struct usb_hid_descriptor *
.Fn usbd_get_hid_descriptor "usbd_interface_handle ifc"
.Ft usbd_status
.Fn usbd_set_report "usbd_interface_handle iface" "nt type" "int id" "void *data" "int len"
.Ft usbd_status
.Fn usbd_set_report_async "usbd_interface_handle iface" "int type" "int id" "void *data" "int len"
.Ft usbd_status
.Fn usbd_get_report "usbd_interface_handle iface" "int type" "int id" "void *data" "int len"
.Ft usbd_status
.Fn usbd_set_idle "usbd_interface_handle iface" "int duration" "int id"
.Ft usbd_status
.Fn usbd_alloc_report_desc "usbd_interface_handle ifc" "void **descp" \
 "int *sizep" "int mem"
.Ft usbd_status
.Fn usbd_get_config "usbd_device_handle dev" "uint8_t *conf"
.Ft usbd_status
.Fn usbd_get_string_desc "usbd_device_handle dev" "int sindex" "int langid" \
 "usb_string_descriptor_t *sdesc"
.Ft void
.Fn usbd_delay_ms "usbd_device_handle dev" "u_int ms"
.Ft usbd_status
.Fn usbd_set_config_no "usbd_device_handle dev" "int no" "int msg"
.Ft usbd_status
.Fn usbd_set_config_index "usbd_device_handle dev" "int index" "int msg"
.Ft usbd_status
.Fn usbd_bulk_transfer "usbd_xfer_handle xfer" "usbd_pipe_handle pipe" \
 "uint16_t flags" "uint32_t timeout" "void *buf" "uint32_t *size" "char *lbl"
.Ft usbd_status
.Fn usbd_intr_transfer "usbd_xfer_handle xfer" "usbd_pipe_handle pipe" \
 "uint16_t flags" "uint32_t timeout" "void *buf" "uint32_t *size" "char *lbl"
.\" these are very different in usbmp
.Ft void
.Fn usb_detach_waitold "device_t dv"
.Ft void
.Fn usb_detach_wakeupold "device_t dv"
.\" .Ft void
.\" .Fn usb_detach_wait "device_t dv" "kcondvar_t *cv" "kmutex_t *lk"
.\" .Ft void
.\" .Fn usb_detach_broadcast "device_t dv" "kcondvar_t *cv"
.Sh DESCRIPTION
Device driver access to the USB bus centers around transfers.
A transfer describes a communication with a USB device.
A transfer is an abstract concept that can result in several
physical packets being transferred to or from a device.
A transfer is described by the
.Va usbd_xfer_handle 
cookie.
A pipe is a logical connection to a USB device.
It is described by the
.Va usbd_pipe_handle
cookie.
.Pp
Pipes are created and destroyed by using the
.Fn usbd_open_pipe ,
.Fn usbd_open_pipe_intr
and
.Fn usbd_close_pipe
functions.
The open functions take the interface handle
.Fa iface ,
the
.Fa address
of this pipe and
.Fa flags
for this pipe which currently may be 0 or
.Dv USBD_EXCLUSIVE_USE ,
to enable exclusive access to this interface and address.
The
.Fn usbd_open_pipe_intr
takes additional arguments
.Fa priv
to set the default private handle.
.Fa buffer
and
.Fa len
to describe the buffer to be used,
.Fa callback
for the function to call at interrupt time, and finally the
.Fa interval
for interrupts to be delivered in milliseconds.
The
.Fa interval
may be set to
.Dv USBD_DEFAULT_INTERVAL
use the default interval, specified by the ep. description.
It is common to have more than one pipe per device.

.Pp
Transfers are allocated and deallocated with
.Fn usbd_alloc_xfer
and
.Fn usbd_free_xfer ,
respectively, and are associated with a pipe at their creation time.
.Pp
The data describing the transfer is filled by either
.Fn usbd_setup_default_xfer
for control pipe transfers, by
.Fn usbd_setup_xfer
for bulk and interrupt transfers, and by
.Fn usbd_setup_isoc_xfer
for isochronous transfers.
Private data may be passed between setup and completion or status
calls using the
.Ft usbd_private_handle priv
argument, which must be an integral type.
.Pp
Arguments to the setup functions include the newly allocated
.Fa xfer ,
the
.Fa pipe
to associate this transfer with,
the private data
.Fa priv ,
the
.Fa timeout
in milliseconds,
for control, bulk and interrupt transfers
.Fa buffer
the data to transfer and its
.Fa length
and for isochronous transfers the the frame length
.Fa frlengths
and number of frames
.Fa nframes ,
and for default transfers a usb request structure
.Fa req
must be presented (see below.)
.Pp
The transfer specific
.Fa flags
that can be set are:
.Bl -tag -width 10n
.It Dv USBD_NO_COPY
Do not copy data to DMA buffer
.It Dv USBD_SYNCHRONOUS
Wait for completion
.It Dv USBD_SYNCHRONOUS_SIG
When waiting for completion, allow signals to trigger wake up.
.It Dv USBD_SHORT_XFER_OK
Short reads are not an error
.It Dv USBD_FORCE_SHORT_XFER
Force last short packet on write
.El
.Pp
Upon completion the
.Fa callback
function is called, which takes the completed
.Fa xfer ,
the private data
.Fa priv
originally assocated with this transfer, and
.Fa status
the status of this transfer.
.Pp
Transfers are initiated by calling
.Fn usbd_transfer ,
and their results made be later obtained by calling
.Fa usbd_get_xfer_status ,
which fills in the private data
.Fa priv ,
original buffer location
.Fa buffer ,
the length
.Fa length ,
and the
.Fa status
of this request.
.Pp
The
.Fn usbd_bulk_transfer
and
.Fn usbd_intr_transfer
functions are used to transfer data in either an interrupt or
bulk fashion, and are front-ends to the
.Fn usbd_setup_xfer ,
.Fn usbd_transfer
and
.Fn usbd_get_xfer_status ,
as well as associated error handling.
The
.Fa lbl
option is deprecated and will be removed.
The
.Fn usbd_sync_transfer
is identical to
.Fn usbd_transfer
with the
.Dv USBD_SYNCHRONOUS
flag set.
The
.Fn usbd_sync_transfer_sig
is identical to
.Fn usbd_transfer
with the
.Dv USBD_SYNCHRONOUS
and
.Dv USBD_SYNCHRONOUS_SIG
flags set.
.Pp
Transfers are aborted via this pipe with
.Fn usbd_abort_pipe
and
.Fn usbd_abort_default_pipe .
.Pp
The
.Fn usbd_clear_endpoint_stall
and
.Fn usbd_clear_endpoint_stall_async
functions are used to clear endpoint halt in either a synchronous
or asynchronous fashion.
To clear the toggle state of an endpoint the
.Fn usbd_clear_endpoint_toggle
function should be used.
.Pp
A request is described by a
.Va usb_device_request_t
which must be initialised as necessary before calling either
.Fn usbd_do_request
or
.Fn usbd_do_request_flags
to submit the request.
See the
.Sx INITIALISING USB REQUESTS
section for more details.
.Pp
There are a number of functions to obtain a handle, descriptor
of resource count:
.Bl -tag -width 10n
.It Fn usbd_device2interface_handle dev ifaceno iface
Fills in
.Fa iface
with the
.Ft usbd_interface_handle
for the USB device
.Fa dev
on interface number
.Fa ifaceno .
.It Fn usbd_interface2device_handle iface dev
Fills in
.Fa dev
with the
.Ft usbd_device_handle
pointer for interface
.Fa iface .
.\" usbd_pipe2device_handle is unused; remove from usbdi?
.It Fn usbd_pipe2device_handle pipe
Returns the
.Ft usbd_device_handle
associated with
.Fa pipe .
.It Fn usbd_interface2endpoint_descriptor iface address
Returns the
.Ft usb_endpoint_descriptor_t *
for the particular interface
.Fa iface
at address
.Fa address .
.\" XXX describe what a .Ft usb_endpoint_descriptor_t is.
.It Fn usbd_endpoint_count dev count
.It Fn usbd_interface_count dev count
Fills in
.Fa count
with the number of endpoint or interfaces the USB device
.Fa dev
has.
.El
.Pp
Error handling and other return values are described in
.Xr usbd_status 9 .
.Pp
Additional comments on particular functions:
.Bl -tag -width 10n
.It Fn usbd_errstr err
Returns the string associated with
.Fa err .
.It Fn usbd_add_dev_event type iface
The
.Ar type
must be one of
.Dv USB_EVENT_CTRLR_ATTACH ,
.Dv USB_EVENT_CTRLR_DETACH ,
.Dv USB_EVENT_DEVICE_ATTACH
and
.Dv USB_EVENT_DEVICE_DETACH .
.It Fn usbd_add_drv_event type iface dv
The
.Fa type
must be one of
.Dv USB_EVENT_DRIVER_ATTACH
and
.Dv USB_EVENT_DRIVER_DETACH .
The
.Fa dv
corresponds with the
.Ft device_t
associated with the device attached or detached.
.It Fn usb_lookup tbl vendor product
Lookup a USB device.
The returned
.Va struct usb_devno
pointer has these members:
.Bl -item -offset offset -compact
.It
.Vt u_int16_t ud_vendor ;
.It
.Vt u_int16_t ud_product ;
.El
The
.Dv USB_PRODUCT_ANY
macro can be used to match any USB product by a particular vendor.
.El
.\"
.\" XXX functions missing descriptions in usbdi.h XXX
.\"
.\" .Fn usbd_alloc_buffer "usbd_xfer_handle req" "uint32_t size"
.\" .Fn usbd_free_buffer "usbd_xfer_handle req"
.\" .Fn usbd_get_buffer "usbd_xfer_handle xfer"
.\" only in usbmp
.\" .Fn usbd_sync_transfer_sig "usbd_xfer_handle req"
.\" .Fn usbd_do_request "usbd_device_handle dev" "usb_device_request_t *req" \
.\"  "void *data"
.\" .Fn usbd_do_request_flags "usbd_device_handle dev" \
.\"  "usb_device_request_t *req" "void *data" "uint16_t flags" "int *actlen" \
.\"  "u_int32_t timo"
.\" .Fn usbd_get_interface_descriptor "usbd_interface_handle iface"
.\" .Fn usbd_get_config_descriptor "usbd_device_handle dev"
.\" .Fn usbd_get_device_descriptor "usbd_device_handle dev"
.\" .Fn usbd_set_interface "usbd_interface_handle iface" "int altidx"
.\" .Fn usbd_get_no_alts "usb_config_descriptor_t *iface" "int ifaceno"
.\" .Fn usbd_get_interface "usbd_interface_handle iface" "uint8_t *aiface"
.\" .Fn usbd_fill_deviceinfo "usbd_device_handle dev" "struct usb_device_info *di"
.\" .Fn usbd_get_interface_altindex "usbd_interface_handle iface"
.\" .Fn usbd_find_idesc "usb_config_descriptor_t *cd" "int iindex" "int ano"
.\" .Fn usbd_find_edesc "usb_config_descriptor_t *cd" "int ifaceidx" "int altidx" \
.\"  "int endptidx"
.\" .Fn usbd_dopoll "usbd_interface_handle iface"
.\" .Fn usbd_set_polling" usbd_device_handle iface" "int val"
.\"
.\" .Fn usbd_add_dev_event "int type" "usbd_device_handle iface"
.\" .Fn usbd_add_drv_event "int type" "usbd_device_handle iface" "device_t dv"
.\"
.\" .Fn usbd_devinfo_alloc "usbd_device_handle iface" "int showclass"
.\" .Fn usbd_devinfo_free "char *str"
.\"
.\" .Fn usbd_get_quirks "usbd_device_handle iface"
.\" .Fn usbd_get_endpoint_descriptor "usbd_interface_handle dev" \
.\"  "u_int8_t address"
.\" .Fn usbd_reload_device_desc "usbd_device_handle iface"
.\" .Fn usbd_ratecheck "struct timeval *tv"
.\" .Fn usbd_get_string "usbd_device_handle iface" "int si" "char *buf"
.\" .Fn usbd_get_string0 "usbd_device_handle iface" "int" si "char *buf" \
.\"  "int unicode"
.\"
.\" .Fn usb_desc_iter_init "usbd_device_handle iface" "usbd_desc_iter_t *iter"
.\" .Fn usb_desc_iter_next "usbd_desc_iter_t *iter"
.\" .Fn usb_add_task "usbd_device_handle iface" "struct usb_task *task" \
.\"  "int queue"
.\" .Fn usb_rem_task "usbd_device_handle iface" "struct usb_task *task"
.\" .Fn usb_init_task "struct usb_task *task" "void (*func)(void *)" \
.\"  "void *arg"
.\"
.\" XXX functions missing descriptions in usbdi.h XXX
.\"
.\" .Dv usbdi_util.h .
.\" .Ft usbd_status
.\" .Fn usbd_get_desc "usbd_device_handle dev" "int type" "int index" \
.\"  "int len" "void *desc"
.\" .Ft usbd_status
.\" .Fn usbd_get_config_desc "usbd_device_handle dev" "int confidx" \
.\"  "usb_config_descriptor_t *d"
.\" .Ft usbd_status
.\" .Fn usbd_get_config_desc_full "usbd_device_handle" "int dev" "void *d" "int size"
.\" .Ft usbd_status
.\" .Fn usbd_get_device_desc "usbd_device_handle dev" \
.\"  "usb_device_descriptor_t *d"
.\" .Ft usbd_status
.\" .Fn usbd_set_address "usbd_device_handle dev" "int addr"
.\" .Ft usbd_status
.\" .Fn usbd_get_port_status "usbd_device_handle dev" "intp ort" "usb_port_status_t *ps"
.\" .Ft usbd_status
.\" .Fn usbd_set_hub_feature "usbd_device_handle dev" "int sel"
.\" .Ft usbd_status
.\" .Fn usbd_clear_hub_feature "usbd_device_handle dev" "int sel"
.\" .Ft usbd_status
.\" .Fn usbd_set_port_feature "usbd_device_handle dev" "int port" "int sel"
.\" .Ft usbd_status
.\" .Fn usbd_clear_port_feature "usbd_device_handle dev" "int port" "int sel"
.\" .Ft usbd_status
.\" .Fn usbd_get_device_status "usbd_device_handle dev" "usb_status_t *st"
.\" .Ft usbd_status
.\" .Fn usbd_get_hub_status "usbd_device_handle dev" "usb_hub_status_t *st"
.\" .Ft usbd_status
.\" .Fn usbd_set_protocol "usbd_interface_handle dev" "int report"
.\" .Ft usbd_status
.\" .Fn usbd_get_report_descriptor  "usbd_device_handle dev" "int ifcno" "int repid" "int size" "void *d"
.\" .Ft struct usb_hid_descriptor *
.\" .Fn usbd_get_hid_descriptor "usbd_interface_handle ifc"
.\" .Ft usbd_status
.\" .Fn usbd_set_report "usbd_interface_handle iface" "nt type" "int id" "void *data" "int len"
.\" .Ft usbd_status
.\" .Fn usbd_set_report_async "usbd_interface_handle iface" "int type" "int id" "void *data" "int len"
.\" .Ft usbd_status
.\" .Fn usbd_get_report "usbd_interface_handle iface" "int type" "int id" "void *data" "int len"
.\" .Ft usbd_status
.\" .Fn usbd_set_idle "usbd_interface_handle iface" "int duration" "int id"
.\" .Ft usbd_status
.\" .Fn usbd_alloc_report_desc "usbd_interface_handle ifc" "void **descp" \
.\"  "int *sizep" "int mem"
.\" .Ft usbd_status
.\" .Fn usbd_get_config "usbd_device_handle dev" "uint8_t *conf"
.\" .Ft usbd_status
.\" .Fn usbd_get_string_desc "usbd_device_handle dev" "int sindex" "int langid" \
.\"  "usb_string_descriptor_t *sdesc"
.\" .Ft void
.\" .Fn usbd_delay_ms "usbd_device_handle dev" "u_int ms"
.\" .Ft usbd_status
.\" .Fn usbd_set_config_no "usbd_device_handle dev" "int no" "int msg"
.\" .Ft usbd_status
.\" .Fn usbd_set_config_index "usbd_device_handle dev" "int index" "int msg"
.\" .Ft usbd_status
.\" .\" these are very different in usbmp
.\" .Ft void
.\" .Fn usb_detach_waitold "device_t dv"
.\" .Ft void
.\" .Fn usb_detach_wakeupold "device_t dv"
.\" .Ft void
.\" .Fn usb_detach_wait "device_t dv" "kcondvar_t *cv" "kmutex_t *lk"
.\" .Ft void
.\" .Fn usb_detach_broadcast "device_t dv" "kcondvar_t *cv"
.\"
.Sh INITIALISING USB REQUESTS
There are 5 members of a
.Va usb_device_request_t
that must be initialised:
.Pp
.Bl -item -offset offset -compact
.It
.Vt uByte bmRequestType ;
.It
.Vt uByte bRequest ;
.It
.Vt uWord wValue ;
.It
.Vt uWord wIndex ;
.It
.Vt uWord wLength ;
.El
.Pp
The first two are normal byte values that may be simply assigned,
but the last three must be initialised with the
.Fn USETW
macro.
.Pp
The
.Fa bmRequestType
holds the request type of this USB request, which describes the
indended recipient of the request.
.Pp
This may be one of:
.Bl -tag -width UT_WRITEXX -offset offset -compact
.It Dv UT_WRITE
.It Dv UT_READ
.El
.Pp
with one of:
.Bl -tag -width UT_STANDARDXX -offset offset -compact
.It Dv UT_STANDARD
.It Dv UT_CLASS
.It Dv UT_VENDOR
.El
.Pp
and with one of:
.Bl -tag -width UT_INTERFACEXX -offset offset -compact
.It Dv UT_DEVICE
.It Dv UT_INTERFACE
.It Dv UT_ENDPOINT
.It Dv UT_OTHER
.El
.Pp
These are also in combinations as:
.Bl -tag -width UT_WRITE_VENDOR_INTERFACEXX -offset offset -compact
.It Dv UT_READ_DEVICE
.It Dv UT_READ_INTERFACE
.It Dv UT_READ_ENDPOINT
.It Dv UT_WRITE_DEVICE
.It Dv UT_WRITE_INTERFACE
.It Dv UT_WRITE_ENDPOINT
.It Dv UT_READ_CLASS_DEVICE
.It Dv UT_READ_CLASS_INTERFACE
.It Dv UT_READ_CLASS_OTHER
.It Dv UT_READ_CLASS_ENDPOINT
.It Dv UT_WRITE_CLASS_DEVICE
.It Dv UT_WRITE_CLASS_INTERFACE
.It Dv UT_WRITE_CLASS_OTHER
.It Dv UT_WRITE_CLASS_ENDPOINT
.It Dv UT_READ_VENDOR_DEVICE
.It Dv UT_READ_VENDOR_INTERFACE
.It Dv UT_READ_VENDOR_OTHER
.It Dv UT_READ_VENDOR_ENDPOINT
.It Dv UT_WRITE_VENDOR_DEVICE
.It Dv UT_WRITE_VENDOR_INTERFACE
.It Dv UT_WRITE_VENDOR_OTHER
.It Dv UT_WRITE_VENDOR_ENDPOINT
.El
.Pp
The
.Fa bRequest
describes which request is being made.
The available values are:
.Bl -tag -width UR_GET_DESCRIPTORXX -offset offset -compact
.It Dv UR_GET_STATUS
.It Dv UR_CLEAR_FEATURE
.It Dv UR_SET_FEATURE
.It Dv UR_SET_ADDRESS
.It Dv UR_GET_DESCRIPTOR
.It Dv UR_SET_DESCRIPTOR
.It Dv UR_GET_CONFIG
.It Dv UR_SET_CONFIG
.It Dv UR_GET_INTERFACE
.It Dv UR_SET_INTERFACE
.It Dv UR_SYNCH_FRAME
.El
.Pp
The
.Fa wValue ,
.Fa wIndex
and
.Fa wLength
are device-specific values and must be initialised with the
.Fn USETW
macro.
.Sh USB REQUEST TYPES AND STRUCTURES
The
.Dv UR_GET_STATUS
request operates on a
.Va usb_status_t
structure, which has this member:
.Bl -item -offset offset -compact
.It
.Vt uWord wStatus ;
.El
.Pp
For device status requests the
.Fa wStatus
member may have either of these bit flags set:
.Bl -tag -width UDS_REMOTE_WAKEUPXX -offset offset -compact
.It Dv UDS_SELF_POWERED
.It Dv UDS_REMOTE_WAKEUP
.El
.Pp
For endpoint status requests the
.Fa wStatus
member may have this bit flag set:
.Bl -tag -width UES_HALTXX -offset offset -compact
.It Dv UES_HALT
.El
.Pp
The
.Dv UR_CLEAR_FEATURE
and
.Dv UR_SET_FEATURE
requests clear or set special features on USB devices.
The values for
.Va wValue ,
.Va wIndex
and
.Va wLength
depend upon the device and device type.
.Pp
The
.Dv UR_SET_ADDRESS
request sets the virtual USB address of a port using the
.Va wValue .
.Pp
The
.Dv UR_GET_DESCRIPTOR
and
.Dv UR_SET_DESCRIPTOR
requests operate on a
.Va usb_descriptor_t
structure, which has these members:
.Bl -item -offset offset -compact
.It
.Vt uByte bLength ;
.It
.Vt uByte bDescriptorType ;
.El
.Pp
The
.Fa bDescriptorType
member may be one of the following values:
.Bl -tag -width UDESC_OTHER_SPEED_CONFIGURATIONXX -offset offset -compact
.It Dv UDESC_DEVICE
.It Dv UDESC_CONFIG
.It Dv UDESC_STRING
.It Dv UDESC_INTERFACE
.It Dv UDESC_ENDPOINT
.It Dv UDESC_DEVICE_QUALIFIER
.It Dv UDESC_OTHER_SPEED_CONFIGURATION
.It Dv UDESC_INTERFACE_POWER
.It Dv UDESC_OTG
.It Dv UDESC_DEBUG
.It Dv UDESC_INTERFACE_ASSOC
.It Dv UDESC_CS_DEVICE
.It Dv UDESC_CS_CONFIG
.It Dv UDESC_CS_STRING
.It Dv UDESC_CS_INTERFACE
.It Dv UDESC_CS_ENDPOINT
.It Dv UDESC_HUB
.El
.\".Pp
.\" these have API front ends
.\" .It Dv UR_GET_CONFIG
.\" .It Dv UR_SET_CONFIG
.\" .It Dv UR_GET_INTERFACE
.\" .It Dv UR_SET_INTERFACE
.\" this isn't supported
.\" .It Dv UR_SYNCH_FRAME
.Sh SEE ALSO
.Xr usb 4 ,
.Xr usbd_status 9
.Sh HISTORY
This
.Nm
interface first appeared in
.Nx 1.4 .
The interface is based on an early definition from the OpenUSBDI group
within the USB organisation.
Right after this definition the OpenUSBDI development got closed for open
source developers, so this interface has not followed the further changes.
The OpenUSBDI specification is now available again, but looks different.
.Sh BUGS
This manual is under development, so its biggest shortcoming is
incompleteness.