Update usb(4) to match reality, remove section on permissions.
Delete usb2_core.4. Submitted by: Hans Petter Selasky
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@ -25,9 +25,32 @@
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" Copyright (c) 2008 Hans Petter Selasky. 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 November 22, 2006
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.Dd May 20, 2009
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.Dt USB 4
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.Os
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.Sh NAME
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@ -47,22 +70,29 @@ module at boot time, place the following line in
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.Bd -literal -offset indent
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usb_load="YES"
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.Ed
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.Pp
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.In dev/usb/usb.h
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.In dev/usb/usbhid.h
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.Sh USERLAND PROGRAMMING
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USB functions can be accessed from userland through the libusb library.
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See
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.Xr libusb 3
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for more information.
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.Sh DESCRIPTION
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.Fx
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provides machine-independent bus support and drivers for
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.Tn USB
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devices.
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devices in host and device side mode.
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.Pp
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The
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.Nm
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driver has three layers: the controller, the bus, and the
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device layer.
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driver has three layers:
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.Bl -tag
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.It USB Controller (Bus)
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.It USB Device
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.It USB Driver
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.El
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.Pp
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The controller attaches to a physical bus
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(like
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.Xr pci 4 ) .
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like
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.Xr pci 4 .
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The
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.Tn USB
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bus attaches to the controller, and the root hub attaches
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@ -79,14 +109,20 @@ root hub.
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.Sh INTRODUCTION TO USB
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The
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.Tn USB
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is a 12 Mb/s serial bus (1.5 Mb/s for low speed devices).
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is a system where external devices can be connected to a PC.
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The most common USB speeds are:
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.Bl -tag
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.It Low Speed (1.5MBit/sec)
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.It Full Speed (12MBit/sec)
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.It High Speed (480MBit/sec)
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.El
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.Pp
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Each
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.Tn USB
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has a host controller that is the master of the bus;
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all other devices on the bus only speak when spoken to.
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has a USB controller that is the master of the bus.
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The physical communication is simplex which means the host controller only communicates with one USB device at a time.
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.Pp
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There can be up to 127 devices (apart from the host controller)
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on a bus, each with its own address.
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There can be up to 127 devices connected to an USB HUB tree.
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The addresses are assigned
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dynamically by the host when each device is attached to the bus.
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.Pp
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@ -116,286 +152,558 @@ A device may operate in different configurations.
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Depending on the
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configuration, the device may present different sets of endpoints
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and interfaces.
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.\" .Pp
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.\" Each device located on a hub has several
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.\" .Xr config 8
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.\" locators:
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.\" .Bl -tag -compact -width xxxxxx
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.\" .It Cd port
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.\" this is the number of the port on the closest upstream hub.
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.\" .It Cd configuration
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.\" this is the configuration the device must be in for this driver to attach.
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.\" This locator does not set the configuration; it is iterated by the bus
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.\" enumeration.
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.\" .It Cd interface
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.\" this is the interface number within a device that an interface driver
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.\" attaches to.
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.\" .It Cd vendor
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.\" this is the 16 bit vendor id of the device.
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.\" .It Cd product
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.\" this is the 16 bit product id of the device.
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.\" .It Cd release
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.\" this is the 16 bit release (revision) number of the device.
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.\" .El
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.\" The first locator can be used to pin down a particular device
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.\" according to its physical position in the device tree.
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.\" The last three locators can be used to pin down a particular
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.\" device according to what device it actually is.
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.Pp
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The bus enumeration of the
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.Tn USB
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bus proceeds in several steps:
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.Bl -enum
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.It
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Any device specific driver can attach to the device.
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Any interface specific driver can attach to the device.
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.It
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If none is found, any device class specific driver can attach.
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.It
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If none is found, all configurations are iterated over.
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For each configuration, all the interfaces are iterated over, and interface
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drivers can attach.
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If any interface driver attached in a certain
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configuration, the iteration over configurations is stopped.
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.It
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If still no drivers have been found, the generic
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.Tn USB
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driver can attach.
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If none is found, generic interface class drivers can attach.
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.El
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.Sh USB CONTROLLER INTERFACE
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Use the following to get access to the
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.Tn USB
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specific structures and defines.
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.Sh USB KERNEL PROGRAMMING
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Here is a list of commonly used functions:
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.Pp
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The
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.Pa /dev/usb Ns Ar N
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can be opened and a few operations can be performed on it.
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The
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.Xr poll 2
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system call will say that I/O is possible on the controller device when a
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.Tn USB
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device has been connected or disconnected to the bus.
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.
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.Ft "usb2_error_t"
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.Fo "usb2_transfer_setup"
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.Fa "udev"
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.Fa "ifaces"
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.Fa "pxfer"
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.Fa "setup_start"
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.Fa "n_setup"
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.Fa "priv_sc"
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.Fa "priv_mtx"
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.Fc
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.
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.Pp
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The following
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.Xr ioctl 2
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commands are supported on the controller device:
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.Bl -tag -width xxxxxx
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.It Dv USB_DISCOVER
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This command will cause a complete bus discovery to be initiated.
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If any devices attached or detached from the bus they will be
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processed during this command.
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This is the only way that new devices are found on the bus.
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.It Dv USB_DEVICEINFO Vt "struct usb_device_info"
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This command can be used to retrieve some information about a device
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on the bus.
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.
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.Ft "void"
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.Fo "usb2_transfer_unsetup"
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.Fa "pxfer"
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.Fa "n_setup"
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.Fc
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.
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.Pp
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.
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.Ft "void"
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.Fo "usb2_transfer_start"
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.Fa "xfer"
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.Fc
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.
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.Pp
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.
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.Ft "void"
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.Fo "usb2_transfer_stop"
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.Fa "xfer"
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.Fc
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.
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.Pp
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.
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.Ft "void"
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.Fo "usb2_transfer_drain"
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.Fa "xfer"
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.Fc
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.
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.
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.Sh DESCRIPTION
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The
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.Va udi_addr
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field should be filled before the call and the other fields will
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be filled by information about the device on that address.
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Should no such device exist, an error is reported.
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.Bd -literal
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#define USB_MAX_DEVNAMES 4
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#define USB_MAX_DEVNAMELEN 16
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struct usb_device_info {
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u_int8_t udi_bus;
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u_int8_t udi_addr; /* device address */
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usb_event_cookie_t udi_cookie;
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char udi_product[USB_MAX_STRING_LEN];
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char udi_vendor[USB_MAX_STRING_LEN];
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char udi_release[8];
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u_int16_t udi_productNo;
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u_int16_t udi_vendorNo;
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u_int16_t udi_releaseNo;
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u_int8_t udi_class;
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u_int8_t udi_subclass;
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u_int8_t udi_protocol;
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u_int8_t udi_config;
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u_int8_t udi_speed;
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#define USB_SPEED_LOW 1
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#define USB_SPEED_FULL 2
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#define USB_SPEED_HIGH 3
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int udi_power;/* power consumption in mA, 0 if selfpowered */
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int udi_nports;
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char udi_devnames[USB_MAX_DEVNAMES][USB_MAX_DEVNAMELEN];
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u_int8_t udi_ports[16];/* hub only: addresses of devices on ports */
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#define USB_PORT_ENABLED 0xff
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#define USB_PORT_SUSPENDED 0xfe
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#define USB_PORT_POWERED 0xfd
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#define USB_PORT_DISABLED 0xfc
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};
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.Nm
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module implements the core functionality of the USB standard and many
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helper functions to make USB device driver programming easier and more
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safe.
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.
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The
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.Nm
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module supports both USB Host and USB Device side mode!
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.
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.Sh USB TRANSFER MANAGEMENT FUNCTIONS
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The USB standard defines four types of USB transfers.
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.
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Control transfers, Bulk transfers, Interrupt transfers and Isochronous
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transfers.
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.
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All the transfer types are managed using the following five functions:
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.
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.Pp
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.
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.Fn usb2_transfer_setup
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This function will allocate memory for and initialise an array of USB
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transfers and all required DMA memory.
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.
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This function can sleep or block waiting for resources to become
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available.
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.Fa udev
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is a pointer to "struct usb2_device".
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.Fa ifaces
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is an array of interface index numbers to use. See "if_index".
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.Fa pxfer
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is a pointer to an array of USB transfer pointers that are initialized
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to NULL, and then pointed to allocated USB transfers.
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.Fa setup_start
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is a pointer to an array of USB config structures.
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.Fa n_setup
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is a number telling the USB system how many USB transfers should be
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setup.
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.Fa priv_sc
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is the private softc pointer, which will be used to initialize
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"xfer->priv_sc".
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.Fa priv_mtx
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is the private mutex protecting the transfer structure and the
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softc. This pointer is used to initialize "xfer->priv_mtx".
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This function returns
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zero upon success. A non-zero return value indicates failure.
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.
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.Pp
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.
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.Fn usb2_transfer_unsetup
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This function will release the given USB transfers and all allocated
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resources associated with these USB transfers.
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.Fa pxfer
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is a pointer to an array of USB transfer pointers, that may be NULL,
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that should be freed by the USB system.
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.Fa n_setup
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is a number telling the USB system how many USB transfers should be
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unsetup.
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.
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This function can sleep waiting for USB transfers to complete.
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.
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This function is NULL safe with regard to the USB transfer structure
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pointer.
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.
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It is not allowed to call this function from the USB transfer
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callback.
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.
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.Pp
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.
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.Fn usb2_transfer_start
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This function will start the USB transfer pointed to by
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.Fa xfer,
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if not already started.
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.
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This function is always non-blocking and must be called with the
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so-called private USB mutex locked.
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.
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This function is NULL safe with regard to the USB transfer structure
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pointer.
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.
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.Pp
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.
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.Fn usb2_transfer_stop
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This function will stop the USB transfer pointed to by
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.Fa xfer,
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if not already stopped.
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.
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This function is always non-blocking and must be called with the
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so-called private USB mutex locked.
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.
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This function can return before the USB callback has been called.
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.
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This function is NULL safe with regard to the USB transfer structure
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pointer.
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.
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If the transfer was in progress, the callback will called with
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"USB_ST_ERROR" and "xfer->error = USB_ERR_CANCELLED".
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.
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.Pp
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.
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.Fn usb2_transfer_drain
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This function will stop an USB transfer, if not already stopped and
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wait for any additional USB hardware operations to complete.
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.
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Buffers that are loaded into DMA using "usb2_set_frame_data()" can
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safely be freed after that this function has returned.
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.
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This function can block the caller and will not return before the USB
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callback has been called.
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.
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This function is NULL safe with regard to the USB transfer structure
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pointer.
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.
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.Sh USB TRANSFER CALLBACK
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.
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The USB callback has three states.
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.
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USB_ST_SETUP, USB_ST_TRANSFERRED and USB_ST_ERROR. USB_ST_SETUP is the
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initial state.
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.
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After the callback has been called with this state it will always be
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called back at a later stage in one of the other two states.
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.
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In the USB_ST_ERROR state the "error" field of the USB transfer
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structure is set to the error cause.
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.
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The USB callback should not restart the USB transfer in case the error
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cause is USB_ERR_CANCELLED.
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.
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The USB callback is protected from recursion.
|
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.
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That means one can start and stop whatever transfer from the callback
|
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of another transfer one desires.
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.
|
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Also the transfer that is currently called back.
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.
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Recursion is handled like this that when the callback that wants to
|
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recurse returns it is called one more time.
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.
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.
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.Pp
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.
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.Fn usb2_start_hardware
|
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This function should only be called from within the USB callback and
|
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is used to start the USB hardware.
|
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.
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Typical parameters that should be set in the USB transfer structure
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before this function is called are "frlengths[]", "nframes" and
|
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"frbuffers[]".
|
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.
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An USB transfer can have multiple frames consisting of one or more USB
|
||||
packets making up an I/O vector for all USB transfer types.
|
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.
|
||||
After the USB transfer is complete "frlengths[]" is updated to the
|
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actual USB transfer length for the given frame.
|
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.Bd -literal -offset indent
|
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void
|
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usb2_default_callback(struct usb2_xfer *xfer)
|
||||
{
|
||||
switch (USB_GET_STATE(xfer)) {
|
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case USB_ST_SETUP:
|
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/*
|
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* Setup xfer->frlengths[], xfer->nframes
|
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* and write data to xfer->frbuffers[], if any
|
||||
*/
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usb2_start_hardware(xfer);
|
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break;
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|
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case USB_ST_TRANSFERRED:
|
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/*
|
||||
* Read data from xfer->frbuffers[], if any.
|
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* "xfer->frlengths[]" should now have been
|
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* updated to the actual length.
|
||||
*/
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break;
|
||||
|
||||
default: /* Error */
|
||||
/*
|
||||
* Print error message and clear stall
|
||||
* for example.
|
||||
*/
|
||||
break;
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||||
}
|
||||
/*
|
||||
* Here it is safe to do something without the private
|
||||
* USB mutex locked.
|
||||
*/
|
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return;
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||||
}
|
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.Ed
|
||||
.Pp
|
||||
.Va udi_bus
|
||||
and
|
||||
.Va udi_addr
|
||||
contain the topological information for the device.
|
||||
.Va udi_devnames
|
||||
contains the device names of the connected drivers.
|
||||
For example, the
|
||||
third
|
||||
.Tn USB
|
||||
Zip drive connected will be
|
||||
.Li umass2 .
|
||||
The
|
||||
.Va udi_product , udi_vendor
|
||||
and
|
||||
.Va udi_release
|
||||
fields contain self-explanatory descriptions of the device.
|
||||
.Va udi_productNo , udi_vendorNo , udi_releaseNo , udi_class , udi_subclass
|
||||
and
|
||||
.Va udi_protocol
|
||||
contain the corresponding values from the device descriptors.
|
||||
The
|
||||
.Va udi_config
|
||||
field shows the current configuration of the device.
|
||||
.Pp
|
||||
.Va udi_speed
|
||||
indicates whether the device is at low speed
|
||||
.Pq Dv USB_SPEED_LOW ,
|
||||
full speed
|
||||
.Pq Dv USB_SPEED_FULL
|
||||
or high speed
|
||||
.Pq Dv USB_SPEED_HIGH .
|
||||
The
|
||||
.Va udi_power
|
||||
field shows the power consumption in milli-amps drawn at 5 volts,
|
||||
or zero if the device is self powered.
|
||||
.Pp
|
||||
If the device is a hub, the
|
||||
.Va udi_nports
|
||||
field is non-zero, and the
|
||||
.Va udi_ports
|
||||
field contains the addresses of the connected devices.
|
||||
If no device is connected to a port, one of the
|
||||
.Dv USB_PORT_*
|
||||
values indicates its status.
|
||||
.It Dv USB_DEVICESTATS Vt "struct usb_device_stats"
|
||||
This command retrieves statistics about the controller.
|
||||
.Bd -literal
|
||||
struct usb_device_stats {
|
||||
u_long uds_requests[4];
|
||||
};
|
||||
.
|
||||
.Sh USB CONTROL TRANSFERS
|
||||
An USB control transfer has three parts.
|
||||
.
|
||||
First the SETUP packet, then DATA packet(s) and then a STATUS
|
||||
packet.
|
||||
.
|
||||
The SETUP packet is always pointed to by "xfer->frbuffers[0]" and the
|
||||
length is stored in "xfer->frlengths[0]" also if there should not be
|
||||
sent any SETUP packet! If an USB control transfer has no DATA stage,
|
||||
then "xfer->nframes" should be set to 1.
|
||||
.
|
||||
Else the default value is "xfer->nframes" equal to 2.
|
||||
.
|
||||
.Bd -literal -offset indent
|
||||
|
||||
Example1: SETUP + STATUS
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 8;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
Example2: SETUP + DATA + STATUS
|
||||
xfer->nframes = 2;
|
||||
xfer->frlenghts[0] = 8;
|
||||
xfer->frlenghts[1] = 1;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
Example3: SETUP + DATA + STATUS - split
|
||||
1st callback:
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 8;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
2nd callback:
|
||||
/* IMPORTANT: frbuffers[0] must still point at the setup packet! */
|
||||
xfer->nframes = 2;
|
||||
xfer->frlenghts[0] = 0;
|
||||
xfer->frlenghts[1] = 1;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
Example4: SETUP + STATUS - split
|
||||
1st callback:
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 8;
|
||||
xfer->flags.manual_status = 1;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
2nd callback:
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 0;
|
||||
xfer->flags.manual_status = 0;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
.Ed
|
||||
.Sh USB TRANSFER CONFIG
|
||||
To simply the search for endpoints the
|
||||
.Nm
|
||||
module defines a USB config structure where it is possible to specify
|
||||
the characteristics of the wanted endpoint.
|
||||
.Bd -literal -offset indent
|
||||
|
||||
struct usb2_config {
|
||||
bufsize,
|
||||
callback
|
||||
direction,
|
||||
endpoint,
|
||||
frames,
|
||||
index flags,
|
||||
interval,
|
||||
timeout,
|
||||
type,
|
||||
};
|
||||
|
||||
.Ed
|
||||
.
|
||||
.Pp
|
||||
The
|
||||
.Va udi_requests
|
||||
field is indexed by the transfer kind, i.e.\&
|
||||
.Dv UE_* ,
|
||||
and indicates how many transfers of each kind that has been completed
|
||||
by the controller.
|
||||
.It Dv USB_REQUEST Vt "struct usb_ctl_request"
|
||||
This command can be used to execute arbitrary requests on the control pipe.
|
||||
This is
|
||||
.Em DANGEROUS
|
||||
and should be used with great care since it
|
||||
can destroy the bus integrity.
|
||||
.Fa type
|
||||
field selects the USB pipe type.
|
||||
.
|
||||
Valid values are: UE_INTERRUPT, UE_CONTROL, UE_BULK,
|
||||
UE_ISOCHRONOUS.
|
||||
.
|
||||
The special value UE_BULK_INTR will select BULK and INTERRUPT pipes.
|
||||
.
|
||||
This field is mandatory.
|
||||
.
|
||||
.Pp
|
||||
.Fa endpoint
|
||||
field selects the USB endpoint number.
|
||||
.
|
||||
A value of 0xFF, "-1" or "UE_ADDR_ANY" will select the first matching
|
||||
endpoint.
|
||||
.
|
||||
This field is mandatory.
|
||||
.
|
||||
.Pp
|
||||
.Fa direction
|
||||
field selects the USB endpoint direction.
|
||||
.
|
||||
A value of "UE_DIR_ANY" will select the first matching endpoint.
|
||||
.
|
||||
Else valid values are: "UE_DIR_IN" and "UE_DIR_OUT".
|
||||
.
|
||||
"UE_DIR_IN" and "UE_DIR_OUT" can be binary OR'ed by "UE_DIR_SID" which
|
||||
means that the direction will be swapped in case of
|
||||
USB_MODE_DEVICE.
|
||||
.
|
||||
Note that "UE_DIR_IN" refers to the data transfer direction of the
|
||||
"IN" tokens and "UE_DIR_OUT" refers to the data transfer direction of
|
||||
the "OUT" tokens.
|
||||
.
|
||||
This field is mandatory.
|
||||
.
|
||||
.Pp
|
||||
.Fa interval
|
||||
field selects the interrupt interval.
|
||||
.
|
||||
The value of this field is given in milliseconds and is independent of
|
||||
device speed.
|
||||
.
|
||||
Depending on the endpoint type, this field has different meaning:
|
||||
.Bl -tag
|
||||
.It UE_INTERRUPT
|
||||
"0" use the default interrupt interval based on endpoint descriptor.
|
||||
"Else" use the given value for polling rate.
|
||||
.It UE_ISOCHRONOUS
|
||||
"0" use default. "Else" the value is ignored.
|
||||
.It UE_BULK
|
||||
.It UE_CONTROL
|
||||
"0" no transfer pre-delay. "Else" a delay as given by this field in
|
||||
milliseconds is inserted before the hardware is started when
|
||||
"usb2_start_hardware()" is called.
|
||||
.Pp
|
||||
NOTE: The transfer timeout, if any, is started after that the
|
||||
pre-delay has elapsed!
|
||||
.El
|
||||
.
|
||||
.Pp
|
||||
.Fa timeout
|
||||
field, if non-zero, will set the transfer timeout in milliseconds. If
|
||||
the "timeout" field is zero and the transfer type is ISOCHRONOUS a
|
||||
timeout of 250ms will be used.
|
||||
.
|
||||
.Pp
|
||||
.Fa frames
|
||||
field sets the maximum number of frames. If zero is specified it will
|
||||
yield the following results:
|
||||
.Bl -tag
|
||||
.It UE_BULK
|
||||
xfer->nframes = 1;
|
||||
.It UE_INTERRUPT
|
||||
xfer->nframes = 1;
|
||||
.It UE_CONTROL
|
||||
xfer->nframes = 2;
|
||||
.It UE_ISOCHRONOUS
|
||||
Not allowed. Will cause an error.
|
||||
.El
|
||||
.
|
||||
.Pp
|
||||
.Fa ep_index
|
||||
field allows you to give a number, in case more endpoints match the
|
||||
description, that selects which matching "ep_index" should be used.
|
||||
.
|
||||
.Pp
|
||||
.Fa if_index
|
||||
field allows you to select which of the interface numbers in the
|
||||
"ifaces" array parameter passed to "usb2_transfer_setup" that should
|
||||
be used when setting up the given USB transfer.
|
||||
.
|
||||
.Pp
|
||||
.Fa flags
|
||||
field has type "struct usb2_xfer_flags" and allows one to set initial
|
||||
flags an USB transfer. Valid flags are:
|
||||
.Bl -tag
|
||||
.It force_short_xfer
|
||||
This flag forces the last transmitted USB packet to be short. A short
|
||||
packet has a length of less than "xfer->max_packet_size", which
|
||||
derives from "wMaxPacketSize". This flag can be changed during
|
||||
operation.
|
||||
.It short_xfer_ok
|
||||
This flag allows the received transfer length, "xfer->actlen" to be
|
||||
less than "xfer->sumlen" upon completion of a transfer. This flag can
|
||||
be changed during operation.
|
||||
.It short_frames_ok
|
||||
This flag allows the reception of multiple short USB frames. This flag
|
||||
only has effect for BULK and INTERRUPT endpoints and if the number of
|
||||
frames received is greater than 1. This flag can be changed during
|
||||
operation.
|
||||
.It pipe_bof
|
||||
This flag causes a failing USB transfer to remain first in the PIPE
|
||||
queue except in the case of "xfer->error" equal to
|
||||
"USB_ERR_CANCELLED". No other USB transfers in the affected PIPE queue
|
||||
will be started until either:
|
||||
.Bl -tag
|
||||
.It 1
|
||||
The failing USB transfer is stopped using "usb2_transfer_stop()".
|
||||
.It 2
|
||||
The failing USB transfer performs a successful transfer.
|
||||
.El
|
||||
The purpose of this flag is to avoid races when multiple transfers are
|
||||
queued for execution on an USB endpoint, and the first executing
|
||||
transfer fails leading to the need for clearing of stall for
|
||||
example.
|
||||
.
|
||||
In this case this flag is used to prevent the following USB transfers
|
||||
from being executed at the same time the clear-stall command is
|
||||
executed on the USB control endpoint.
|
||||
.
|
||||
This flag can be changed during operation.
|
||||
.Pp
|
||||
"BOF" is short for "Block On Failure"
|
||||
.Pp
|
||||
NOTE: This flag should be set on all BULK and INTERRUPT USB transfers
|
||||
which use an endpoint that can be shared between userland and kernel.
|
||||
.
|
||||
.
|
||||
.It proxy_buffer
|
||||
Setting this flag will cause that the total buffer size will be
|
||||
rounded up to the nearest atomic hardware transfer size.
|
||||
.
|
||||
The maximum data length of any USB transfer is always stored in the
|
||||
"xfer->max_data_length".
|
||||
.
|
||||
For control transfers the USB kernel will allocate additional space
|
||||
for the 8-bytes of SETUP header.
|
||||
.
|
||||
These 8-bytes are not counted by the "xfer->max_data_length"
|
||||
variable.
|
||||
.
|
||||
This flag can not be changed during operation.
|
||||
.
|
||||
.
|
||||
.It ext_buffer
|
||||
Setting this flag will cause that no data buffer will be
|
||||
allocated.
|
||||
.
|
||||
Instead the USB client must supply a data buffer.
|
||||
.
|
||||
This flag can not be changed during operation.
|
||||
.
|
||||
.
|
||||
.It manual_status
|
||||
Setting this flag prevents an USB STATUS stage to be appended to the
|
||||
end of the USB control transfer.
|
||||
.
|
||||
If no control data is transferred this flag must be cleared.
|
||||
.
|
||||
Else an error will be returned to the USB callback.
|
||||
.
|
||||
This flag is mostly useful for the USB device side.
|
||||
.
|
||||
This flag can be changed during operation.
|
||||
.
|
||||
.
|
||||
.It no_pipe_ok
|
||||
Setting this flag causes the USB_ERR_NO_PIPE error to be ignored. This
|
||||
flag can not be changed during operation.
|
||||
.
|
||||
.
|
||||
.It stall_pipe
|
||||
.Bl -tag
|
||||
.It Device Side Mode
|
||||
Setting this flag will cause STALL pids to be sent to the endpoint
|
||||
belonging to this transfer before the transfer is started.
|
||||
.
|
||||
The transfer is started at the moment the host issues a clear-stall
|
||||
command on the STALL'ed endpoint.
|
||||
.
|
||||
This flag can be changed during operation.
|
||||
.It Host Side Mode
|
||||
Setting this flag will cause a clear-stall control request to be
|
||||
executed on the endpoint before the USB transfer is started.
|
||||
.El
|
||||
.Pp
|
||||
The include file
|
||||
.In dev/usb/usb.h
|
||||
contains definitions for the types used by the various
|
||||
.Xr ioctl 2
|
||||
calls.
|
||||
The naming convention of the fields for the various
|
||||
.Tn USB
|
||||
descriptors exactly follows the naming in the
|
||||
.Tn USB
|
||||
specification.
|
||||
Byte sized fields can be accessed directly, but word (16 bit)
|
||||
sized fields must be access by the
|
||||
.Fn UGETW field
|
||||
and
|
||||
.Fn USETW field value
|
||||
macros to handle byte order and alignment properly.
|
||||
If this flag is changed outside the USB callback function you have to
|
||||
use the "usb2_transfer_set_stall()" and "usb2_transfer_clear_stall()"
|
||||
functions! This flag is automatically cleared after that the stall or
|
||||
clear stall has been executed.
|
||||
.
|
||||
.El
|
||||
.Pp
|
||||
The include file
|
||||
.In dev/usb/usbhid.h
|
||||
similarly contains the definitions for
|
||||
Human Interface Devices
|
||||
.Pq Tn HID .
|
||||
.Sh USB EVENT INTERFACE
|
||||
All
|
||||
.Tn USB
|
||||
events are reported via the
|
||||
.Pa /dev/usb
|
||||
device.
|
||||
This device can be opened for reading and each
|
||||
.Xr read 2
|
||||
will yield an event record (if something has happened).
|
||||
.Fa bufsize
|
||||
field sets the total buffer size in bytes.
|
||||
.
|
||||
If this field is zero, "wMaxPacketSize" will be used, multiplied by
|
||||
the "frames" field if the transfer type is ISOCHRONOUS.
|
||||
.
|
||||
This is useful for setting up interrupt pipes.
|
||||
.
|
||||
This field is mandatory.
|
||||
.Pp
|
||||
NOTE: For control transfers "bufsize" includes the length of the
|
||||
request structure.
|
||||
.
|
||||
.Pp
|
||||
.Fa callback
|
||||
pointer sets the USB callback. This field is mandatory.
|
||||
.
|
||||
.
|
||||
.Sh USB LINUX COMPAT LAYER
|
||||
The
|
||||
.Xr poll 2
|
||||
system call can be used to determine if an event record is available
|
||||
for reading.
|
||||
.Pp
|
||||
The event record has the following definition:
|
||||
.Bd -literal
|
||||
struct usb_event {
|
||||
int ue_type;
|
||||
#define USB_EVENT_CTRLR_ATTACH 1
|
||||
#define USB_EVENT_CTRLR_DETACH 2
|
||||
#define USB_EVENT_DEVICE_ATTACH 3
|
||||
#define USB_EVENT_DEVICE_DETACH 4
|
||||
#define USB_EVENT_DRIVER_ATTACH 5
|
||||
#define USB_EVENT_DRIVER_DETACH 6
|
||||
struct timespec ue_time;
|
||||
union {
|
||||
struct {
|
||||
int ue_bus;
|
||||
} ue_ctrlr;
|
||||
struct usb_device_info ue_device;
|
||||
struct {
|
||||
usb_event_cookie_t ue_cookie;
|
||||
char ue_devname[16];
|
||||
} ue_driver;
|
||||
} u;
|
||||
};
|
||||
.Ed
|
||||
The
|
||||
.Va ue_type
|
||||
field identifies the type of event that is described.
|
||||
The possible events are attach/detach of a host controller,
|
||||
a device, or a device driver.
|
||||
The union contains information
|
||||
pertinent to the different types of events.
|
||||
Macros,
|
||||
.Fn USB_EVENT_IS_ATTACH "ue_type"
|
||||
and
|
||||
.Fn USB_EVENT_IS_DETACH "ue_type"
|
||||
can be used to determine if an event was an
|
||||
.Dq attach
|
||||
or a
|
||||
.Dq detach
|
||||
request.
|
||||
.Pp
|
||||
The
|
||||
.Va ue_bus
|
||||
contains the number of the
|
||||
.Tn USB
|
||||
bus for host controller events.
|
||||
.Pp
|
||||
The
|
||||
.Va ue_device
|
||||
record contains information about the device in a device event event.
|
||||
.Pp
|
||||
The
|
||||
.Va ue_cookie
|
||||
is an opaque value that uniquely determines which
|
||||
device a device driver has been attached to (i.e., it equals
|
||||
the cookie value in the device that the driver attached to).
|
||||
.Pp
|
||||
The
|
||||
.Va ue_devname
|
||||
contains the name of the device (driver) as seen in, e.g.,
|
||||
kernel messages.
|
||||
.Pp
|
||||
Note that there is a separation between device and device
|
||||
driver events.
|
||||
A device event is generated when a physical
|
||||
.Tn USB
|
||||
device is attached or detached.
|
||||
A single
|
||||
.Tn USB
|
||||
device may
|
||||
have zero, one, or many device drivers associated with it.
|
||||
.Nm
|
||||
module supports the Linux USB API.
|
||||
.
|
||||
.
|
||||
.
|
||||
.Sh SEE ALSO
|
||||
The
|
||||
.Tn USB
|
||||
@ -403,6 +711,7 @@ specifications can be found at:
|
||||
.Pp
|
||||
.D1 Pa http://www.usb.org/developers/docs/
|
||||
.Pp
|
||||
.Xr libusb 3 ,
|
||||
.Xr aue 4 ,
|
||||
.Xr axe 4 ,
|
||||
.Xr cue 4 ,
|
||||
@ -413,7 +722,6 @@ specifications can be found at:
|
||||
.Xr rue 4 ,
|
||||
.Xr ucom 4 ,
|
||||
.Xr udav 4 ,
|
||||
.Xr ugen 4 ,
|
||||
.Xr uhci 4 ,
|
||||
.Xr uhid 4 ,
|
||||
.Xr ukbd 4 ,
|
||||
@ -423,17 +731,16 @@ specifications can be found at:
|
||||
.Xr uplcom 4 ,
|
||||
.Xr urio 4 ,
|
||||
.Xr uvscom 4 ,
|
||||
.Xr usbdevs 8
|
||||
.Xr usbconfig 8
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Nm
|
||||
module complies with the USB 2.0 standard.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Nm
|
||||
driver first appeared in
|
||||
.Fx 3.0 .
|
||||
.Sh AUTHORS
|
||||
The
|
||||
module has been inspired by the NetBSD USB stack initially written by
|
||||
Lennart Augustsson. The
|
||||
.Nm
|
||||
driver was written by
|
||||
.An Lennart Augustsson Aq augustss@carlstedt.se
|
||||
for the
|
||||
.Nx
|
||||
project.
|
||||
module was written by
|
||||
.An Hans Petter Selasky Aq hselasky@freebsd.org .
|
||||
|
||||
@ -1,635 +0,0 @@
|
||||
.\" $FreeBSD$
|
||||
.\"
|
||||
.\" Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
|
||||
.\"
|
||||
.\" Redistribution and use in source and binary forms, with or without
|
||||
.\" modification, are permitted provided that the following conditions
|
||||
.\" are met:
|
||||
.\" 1. Redistributions of source code must retain the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer.
|
||||
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||||
.\" notice, this list of conditions and the following disclaimer in the
|
||||
.\" documentation and/or other materials provided with the distribution.
|
||||
.\"
|
||||
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
.\" SUCH DAMAGE.
|
||||
.\"
|
||||
.Dd February 17, 2009
|
||||
.Dt USB2_CORE 4
|
||||
.Os
|
||||
.
|
||||
.Sh NAME
|
||||
.
|
||||
.
|
||||
.Nm usb2_core
|
||||
.
|
||||
.Nd "USB core functions"
|
||||
.
|
||||
.
|
||||
.Sh SYNOPSIS
|
||||
To compile this module into the kernel, place the following line in
|
||||
your kernel configuration file:
|
||||
.Bd -ragged -offset indent
|
||||
.Cd "device usb2_core"
|
||||
.Ed
|
||||
.Pp
|
||||
To load the module at boot time, place the following line in
|
||||
.Xr loader.conf 5 :
|
||||
.Bd -literal -offset indent
|
||||
usb2_core_load="YES"
|
||||
.Ed
|
||||
.
|
||||
.Pp
|
||||
Here is a list of commonly used functions:
|
||||
.Pp
|
||||
.
|
||||
.Ft "usb2_error_t"
|
||||
.Fo "usb2_transfer_setup"
|
||||
.Fa "udev"
|
||||
.Fa "ifaces"
|
||||
.Fa "pxfer"
|
||||
.Fa "setup_start"
|
||||
.Fa "n_setup"
|
||||
.Fa "priv_sc"
|
||||
.Fa "priv_mtx"
|
||||
.Fc
|
||||
.
|
||||
.Ft "void"
|
||||
.Fo "usb2_transfer_unsetup"
|
||||
.Fa "pxfer"
|
||||
.Fa "n_setup"
|
||||
.Fc
|
||||
.
|
||||
.Ft "void"
|
||||
.Fo "usb2_transfer_start"
|
||||
.Fa "xfer"
|
||||
.Fc
|
||||
.
|
||||
.Ft "void"
|
||||
.Fo "usb2_transfer_stop"
|
||||
.Fa "xfer"
|
||||
.Fc
|
||||
.
|
||||
.Ft "void"
|
||||
.Fo "usb2_transfer_drain"
|
||||
.Fa "xfer"
|
||||
.Fc
|
||||
.
|
||||
.
|
||||
.Sh DESCRIPTION
|
||||
The
|
||||
.Nm
|
||||
module implements the core functionality of the USB standard and many
|
||||
helper functions to make USB device driver programming easier and more
|
||||
safe.
|
||||
.
|
||||
The
|
||||
.Nm
|
||||
module supports both USB Host and USB Device side mode!
|
||||
.
|
||||
.Sh USB TRANSFER MANAGEMENT FUNCTIONS
|
||||
The USB standard defines four types of USB transfers.
|
||||
.
|
||||
Control transfers, Bulk transfers, Interrupt transfers and Isochronous
|
||||
transfers.
|
||||
.
|
||||
All the transfer types are managed using the following five functions:
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Fn usb2_transfer_setup
|
||||
This function will allocate memory for and initialise an array of USB
|
||||
transfers and all required DMA memory.
|
||||
.
|
||||
This function can sleep or block waiting for resources to become
|
||||
available.
|
||||
.Fa udev
|
||||
is a pointer to "struct usb2_device".
|
||||
.Fa ifaces
|
||||
is an array of interface index numbers to use. See "if_index".
|
||||
.Fa pxfer
|
||||
is a pointer to an array of USB transfer pointers that are initialized
|
||||
to NULL, and then pointed to allocated USB transfers.
|
||||
.Fa setup_start
|
||||
is a pointer to an array of USB config structures.
|
||||
.Fa n_setup
|
||||
is a number telling the USB system how many USB transfers should be
|
||||
setup.
|
||||
.Fa priv_sc
|
||||
is the private softc pointer, which will be used to initialize
|
||||
"xfer->priv_sc".
|
||||
.Fa priv_mtx
|
||||
is the private mutex protecting the transfer structure and the
|
||||
softc. This pointer is used to initialize "xfer->priv_mtx".
|
||||
This function returns
|
||||
zero upon success. A non-zero return value indicates failure.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Fn usb2_transfer_unsetup
|
||||
This function will release the given USB transfers and all allocated
|
||||
resources associated with these USB transfers.
|
||||
.Fa pxfer
|
||||
is a pointer to an array of USB transfer pointers, that may be NULL,
|
||||
that should be freed by the USB system.
|
||||
.Fa n_setup
|
||||
is a number telling the USB system how many USB transfers should be
|
||||
unsetup.
|
||||
.
|
||||
This function can sleep waiting for USB transfers to complete.
|
||||
.
|
||||
This function is NULL safe with regard to the USB transfer structure
|
||||
pointer.
|
||||
.
|
||||
It is not allowed to call this function from the USB transfer
|
||||
callback.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Fn usb2_transfer_start
|
||||
This function will start the USB transfer pointed to by
|
||||
.Fa xfer,
|
||||
if not already started.
|
||||
.
|
||||
This function is always non-blocking and must be called with the
|
||||
so-called private USB mutex locked.
|
||||
.
|
||||
This function is NULL safe with regard to the USB transfer structure
|
||||
pointer.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Fn usb2_transfer_stop
|
||||
This function will stop the USB transfer pointed to by
|
||||
.Fa xfer,
|
||||
if not already stopped.
|
||||
.
|
||||
This function is always non-blocking and must be called with the
|
||||
so-called private USB mutex locked.
|
||||
.
|
||||
This function can return before the USB callback has been called.
|
||||
.
|
||||
This function is NULL safe with regard to the USB transfer structure
|
||||
pointer.
|
||||
.
|
||||
If the transfer was in progress, the callback will called with
|
||||
"USB_ST_ERROR" and "xfer->error = USB_ERR_CANCELLED".
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Fn usb2_transfer_drain
|
||||
This function will stop an USB transfer, if not already stopped and
|
||||
wait for any additional USB hardware operations to complete.
|
||||
.
|
||||
Buffers that are loaded into DMA using "usb2_set_frame_data()" can
|
||||
safely be freed after that this function has returned.
|
||||
.
|
||||
This function can block the caller and will not return before the USB
|
||||
callback has been called.
|
||||
.
|
||||
This function is NULL safe with regard to the USB transfer structure
|
||||
pointer.
|
||||
.
|
||||
.Sh USB TRANSFER CALLBACK
|
||||
.
|
||||
The USB callback has three states.
|
||||
.
|
||||
USB_ST_SETUP, USB_ST_TRANSFERRED and USB_ST_ERROR. USB_ST_SETUP is the
|
||||
initial state.
|
||||
.
|
||||
After the callback has been called with this state it will always be
|
||||
called back at a later stage in one of the other two states.
|
||||
.
|
||||
In the USB_ST_ERROR state the "error" field of the USB transfer
|
||||
structure is set to the error cause.
|
||||
.
|
||||
The USB callback should not restart the USB transfer in case the error
|
||||
cause is USB_ERR_CANCELLED.
|
||||
.
|
||||
The USB callback is protected from recursion.
|
||||
.
|
||||
That means one can start and stop whatever transfer from the callback
|
||||
of another transfer one desires.
|
||||
.
|
||||
Also the transfer that is currently called back.
|
||||
.
|
||||
Recursion is handled like this that when the callback that wants to
|
||||
recurse returns it is called one more time.
|
||||
.
|
||||
.
|
||||
.Pp
|
||||
.
|
||||
.Fn usb2_start_hardware
|
||||
This function should only be called from within the USB callback and
|
||||
is used to start the USB hardware.
|
||||
.
|
||||
Typical parameters that should be set in the USB transfer structure
|
||||
before this function is called are "frlengths[]", "nframes" and
|
||||
"frbuffers[]".
|
||||
.
|
||||
An USB transfer can have multiple frames consisting of one or more USB
|
||||
packets making up an I/O vector for all USB transfer types.
|
||||
.
|
||||
After the USB transfer is complete "frlengths[]" is updated to the
|
||||
actual USB transfer length for the given frame.
|
||||
.Bd -literal -offset indent
|
||||
void
|
||||
usb2_default_callback(struct usb2_xfer *xfer)
|
||||
{
|
||||
switch (USB_GET_STATE(xfer)) {
|
||||
case USB_ST_SETUP:
|
||||
/*
|
||||
* Setup xfer->frlengths[], xfer->nframes
|
||||
* and write data to xfer->frbuffers[], if any
|
||||
*/
|
||||
usb2_start_hardware(xfer);
|
||||
break;
|
||||
|
||||
case USB_ST_TRANSFERRED:
|
||||
/*
|
||||
* Read data from xfer->frbuffers[], if any.
|
||||
* "xfer->frlengths[]" should now have been
|
||||
* updated to the actual length.
|
||||
*/
|
||||
break;
|
||||
|
||||
default: /* Error */
|
||||
/*
|
||||
* Print error message and clear stall
|
||||
* for example.
|
||||
*/
|
||||
break;
|
||||
}
|
||||
/*
|
||||
* Here it is safe to do something without the private
|
||||
* USB mutex locked.
|
||||
*/
|
||||
return;
|
||||
}
|
||||
.Ed
|
||||
.
|
||||
.Sh USB CONTROL TRANSFERS
|
||||
An USB control transfer has three parts.
|
||||
.
|
||||
First the SETUP packet, then DATA packet(s) and then a STATUS
|
||||
packet.
|
||||
.
|
||||
The SETUP packet is always pointed to by "xfer->frbuffers[0]" and the
|
||||
length is stored in "xfer->frlengths[0]" also if there should not be
|
||||
sent any SETUP packet! If an USB control transfer has no DATA stage,
|
||||
then "xfer->nframes" should be set to 1.
|
||||
.
|
||||
Else the default value is "xfer->nframes" equal to 2.
|
||||
.
|
||||
.Bd -literal -offset indent
|
||||
|
||||
Example1: SETUP + STATUS
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 8;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
Example2: SETUP + DATA + STATUS
|
||||
xfer->nframes = 2;
|
||||
xfer->frlenghts[0] = 8;
|
||||
xfer->frlenghts[1] = 1;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
Example3: SETUP + DATA + STATUS - split
|
||||
1st callback:
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 8;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
2nd callback:
|
||||
/* IMPORTANT: frbuffers[0] must still point at the setup packet! */
|
||||
xfer->nframes = 2;
|
||||
xfer->frlenghts[0] = 0;
|
||||
xfer->frlenghts[1] = 1;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
Example4: SETUP + STATUS - split
|
||||
1st callback:
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 8;
|
||||
xfer->flags.manual_status = 1;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
2nd callback:
|
||||
xfer->nframes = 1;
|
||||
xfer->frlenghts[0] = 0;
|
||||
xfer->flags.manual_status = 0;
|
||||
usb2_start_hardware(xfer);
|
||||
|
||||
.Ed
|
||||
.Sh USB TRANSFER CONFIG
|
||||
To simply the search for endpoints the
|
||||
.Nm
|
||||
module defines a USB config structure where it is possible to specify
|
||||
the characteristics of the wanted endpoint.
|
||||
.Bd -literal -offset indent
|
||||
|
||||
struct usb2_config {
|
||||
bufsize,
|
||||
callback
|
||||
direction,
|
||||
endpoint,
|
||||
frames,
|
||||
index flags,
|
||||
interval,
|
||||
timeout,
|
||||
type,
|
||||
};
|
||||
|
||||
.Ed
|
||||
.
|
||||
.Pp
|
||||
.Fa type
|
||||
field selects the USB pipe type.
|
||||
.
|
||||
Valid values are: UE_INTERRUPT, UE_CONTROL, UE_BULK,
|
||||
UE_ISOCHRONOUS.
|
||||
.
|
||||
The special value UE_BULK_INTR will select BULK and INTERRUPT pipes.
|
||||
.
|
||||
This field is mandatory.
|
||||
.
|
||||
.Pp
|
||||
.Fa endpoint
|
||||
field selects the USB endpoint number.
|
||||
.
|
||||
A value of 0xFF, "-1" or "UE_ADDR_ANY" will select the first matching
|
||||
endpoint.
|
||||
.
|
||||
This field is mandatory.
|
||||
.
|
||||
.Pp
|
||||
.Fa direction
|
||||
field selects the USB endpoint direction.
|
||||
.
|
||||
A value of "UE_DIR_ANY" will select the first matching endpoint.
|
||||
.
|
||||
Else valid values are: "UE_DIR_IN" and "UE_DIR_OUT".
|
||||
.
|
||||
"UE_DIR_IN" and "UE_DIR_OUT" can be binary OR'ed by "UE_DIR_SID" which
|
||||
means that the direction will be swapped in case of
|
||||
USB_MODE_DEVICE.
|
||||
.
|
||||
Note that "UE_DIR_IN" refers to the data transfer direction of the
|
||||
"IN" tokens and "UE_DIR_OUT" refers to the data transfer direction of
|
||||
the "OUT" tokens.
|
||||
.
|
||||
This field is mandatory.
|
||||
.
|
||||
.Pp
|
||||
.Fa interval
|
||||
field selects the interrupt interval.
|
||||
.
|
||||
The value of this field is given in milliseconds and is independent of
|
||||
device speed.
|
||||
.
|
||||
Depending on the endpoint type, this field has different meaning:
|
||||
.Bl -tag
|
||||
.It UE_INTERRUPT
|
||||
"0" use the default interrupt interval based on endpoint descriptor.
|
||||
"Else" use the given value for polling rate.
|
||||
.It UE_ISOCHRONOUS
|
||||
"0" use default. "Else" the value is ignored.
|
||||
.It UE_BULK
|
||||
.It UE_CONTROL
|
||||
"0" no transfer pre-delay. "Else" a delay as given by this field in
|
||||
milliseconds is inserted before the hardware is started when
|
||||
"usb2_start_hardware()" is called.
|
||||
.Pp
|
||||
NOTE: The transfer timeout, if any, is started after that the
|
||||
pre-delay has elapsed!
|
||||
.El
|
||||
.
|
||||
.Pp
|
||||
.Fa timeout
|
||||
field, if non-zero, will set the transfer timeout in milliseconds. If
|
||||
the "timeout" field is zero and the transfer type is ISOCHRONOUS a
|
||||
timeout of 250ms will be used.
|
||||
.
|
||||
.Pp
|
||||
.Fa frames
|
||||
field sets the maximum number of frames. If zero is specified it will
|
||||
yield the following results:
|
||||
.Bl -tag
|
||||
.It UE_BULK
|
||||
xfer->nframes = 1;
|
||||
.It UE_INTERRUPT
|
||||
xfer->nframes = 1;
|
||||
.It UE_CONTROL
|
||||
xfer->nframes = 2;
|
||||
.It UE_ISOCHRONOUS
|
||||
Not allowed. Will cause an error.
|
||||
.El
|
||||
.
|
||||
.Pp
|
||||
.Fa ep_index
|
||||
field allows you to give a number, in case more endpoints match the
|
||||
description, that selects which matching "ep_index" should be used.
|
||||
.
|
||||
.Pp
|
||||
.Fa if_index
|
||||
field allows you to select which of the interface numbers in the
|
||||
"ifaces" array parameter passed to "usb2_transfer_setup" that should
|
||||
be used when setting up the given USB transfer.
|
||||
.
|
||||
.Pp
|
||||
.Fa flags
|
||||
field has type "struct usb2_xfer_flags" and allows one to set initial
|
||||
flags an USB transfer. Valid flags are:
|
||||
.Bl -tag
|
||||
.It force_short_xfer
|
||||
This flag forces the last transmitted USB packet to be short. A short
|
||||
packet has a length of less than "xfer->max_packet_size", which
|
||||
derives from "wMaxPacketSize". This flag can be changed during
|
||||
operation.
|
||||
.It short_xfer_ok
|
||||
This flag allows the received transfer length, "xfer->actlen" to be
|
||||
less than "xfer->sumlen" upon completion of a transfer. This flag can
|
||||
be changed during operation.
|
||||
.It short_frames_ok
|
||||
This flag allows the reception of multiple short USB frames. This flag
|
||||
only has effect for BULK and INTERRUPT endpoints and if the number of
|
||||
frames received is greater than 1. This flag can be changed during
|
||||
operation.
|
||||
.It pipe_bof
|
||||
This flag causes a failing USB transfer to remain first in the PIPE
|
||||
queue except in the case of "xfer->error" equal to
|
||||
"USB_ERR_CANCELLED". No other USB transfers in the affected PIPE queue
|
||||
will be started until either:
|
||||
.Bl -tag
|
||||
.It 1
|
||||
The failing USB transfer is stopped using "usb2_transfer_stop()".
|
||||
.It 2
|
||||
The failing USB transfer performs a successful transfer.
|
||||
.El
|
||||
The purpose of this flag is to avoid races when multiple transfers are
|
||||
queued for execution on an USB endpoint, and the first executing
|
||||
transfer fails leading to the need for clearing of stall for
|
||||
example.
|
||||
.
|
||||
In this case this flag is used to prevent the following USB transfers
|
||||
from being executed at the same time the clear-stall command is
|
||||
executed on the USB control endpoint.
|
||||
.
|
||||
This flag can be changed during operation.
|
||||
.Pp
|
||||
"BOF" is short for "Block On Failure"
|
||||
.Pp
|
||||
NOTE: This flag should be set on all BULK and INTERRUPT USB transfers
|
||||
which use an endpoint that can be shared between userland and kernel.
|
||||
.
|
||||
.
|
||||
.It proxy_buffer
|
||||
Setting this flag will cause that the total buffer size will be
|
||||
rounded up to the nearest atomic hardware transfer size.
|
||||
.
|
||||
The maximum data length of any USB transfer is always stored in the
|
||||
"xfer->max_data_length".
|
||||
.
|
||||
For control transfers the USB kernel will allocate additional space
|
||||
for the 8-bytes of SETUP header.
|
||||
.
|
||||
These 8-bytes are not counted by the "xfer->max_data_length"
|
||||
variable.
|
||||
.
|
||||
This flag can not be changed during operation.
|
||||
.
|
||||
.
|
||||
.It ext_buffer
|
||||
Setting this flag will cause that no data buffer will be
|
||||
allocated.
|
||||
.
|
||||
Instead the USB client must supply a data buffer.
|
||||
.
|
||||
This flag can not be changed during operation.
|
||||
.
|
||||
.
|
||||
.It manual_status
|
||||
Setting this flag prevents an USB STATUS stage to be appended to the
|
||||
end of the USB control transfer.
|
||||
.
|
||||
If no control data is transferred this flag must be cleared.
|
||||
.
|
||||
Else an error will be returned to the USB callback.
|
||||
.
|
||||
This flag is mostly useful for the USB device side.
|
||||
.
|
||||
This flag can be changed during operation.
|
||||
.
|
||||
.
|
||||
.It no_pipe_ok
|
||||
Setting this flag causes the USB_ERR_NO_PIPE error to be ignored. This
|
||||
flag can not be changed during operation.
|
||||
.
|
||||
.
|
||||
.It stall_pipe
|
||||
.Bl -tag
|
||||
.It Device Side Mode
|
||||
Setting this flag will cause STALL pids to be sent to the endpoint
|
||||
belonging to this transfer before the transfer is started.
|
||||
.
|
||||
The transfer is started at the moment the host issues a clear-stall
|
||||
command on the STALL'ed endpoint.
|
||||
.
|
||||
This flag can be changed during operation.
|
||||
.It Host Side Mode
|
||||
Setting this flag will cause a clear-stall control request to be
|
||||
executed on the endpoint before the USB transfer is started.
|
||||
.El
|
||||
.Pp
|
||||
If this flag is changed outside the USB callback function you have to
|
||||
use the "usb2_transfer_set_stall()" and "usb2_transfer_clear_stall()"
|
||||
functions !
|
||||
.
|
||||
.El
|
||||
.Pp
|
||||
.Fa bufsize
|
||||
field sets the total buffer size in bytes.
|
||||
.
|
||||
If this field is zero, "wMaxPacketSize" will be used, multiplied by
|
||||
the "frames" field if the transfer type is ISOCHRONOUS.
|
||||
.
|
||||
This is useful for setting up interrupt pipes.
|
||||
.
|
||||
This field is mandatory.
|
||||
.Pp
|
||||
NOTE: For control transfers "bufsize" includes the length of the
|
||||
request structure.
|
||||
.
|
||||
.Pp
|
||||
.Fa callback
|
||||
pointer sets the USB callback. This field is mandatory.
|
||||
.
|
||||
.
|
||||
.Sh USB LINUX COMPAT LAYER
|
||||
The
|
||||
.Nm
|
||||
module supports the Linux USB API.
|
||||
.
|
||||
.
|
||||
.
|
||||
.
|
||||
.Sh USB SECURITY MODEL
|
||||
.
|
||||
.
|
||||
The
|
||||
.Nm
|
||||
module implements fine grained read and write access based on username
|
||||
and group.
|
||||
.
|
||||
Access is granted at four levels:
|
||||
.
|
||||
.Bl -tag
|
||||
.It Level 4 - USB interface
|
||||
USB interfaces can be given individual access rights.
|
||||
.It Level 3 - USB device
|
||||
USB devices can be given individual access rights.
|
||||
.It Level 2 - USB BUS
|
||||
USB busses can be given individual access rights.
|
||||
.It Level 1 - USB
|
||||
USB as a whole can be given individual access rights.
|
||||
.El
|
||||
.Pp
|
||||
The
|
||||
.Nm
|
||||
module will search for access rights starting at level 4 continuing
|
||||
downwards to USB at level 1.
|
||||
.
|
||||
For critical applications you should be aware that the outgoing serial
|
||||
BUS traffic will be broadcasted to all USB devices.
|
||||
.
|
||||
For absolute security USB devices that require different access rights
|
||||
should not be placed on the same USB BUS or controller.
|
||||
.
|
||||
If connected to the same USB bus, it is possible that a USB device can
|
||||
sniff and intercept the communication of another USB device.
|
||||
.
|
||||
Using USB HUBs will not solve this problem.
|
||||
.Sh SEE ALSO
|
||||
.Xr usb2_controller 4
|
||||
.Xr usbconfig 8
|
||||
.Sh STANDARDS
|
||||
The
|
||||
.Nm
|
||||
module complies with the USB 2.0 standard.
|
||||
.Sh HISTORY
|
||||
The
|
||||
.Nm
|
||||
module has been inspired by the NetBSD USB stack initially written by
|
||||
Lennart Augustsson. The
|
||||
.Nm
|
||||
module was written by
|
||||
.An Hans Petter Selasky Aq hselasky@freebsd.org .
|
||||
Loading…
x
Reference in New Issue
Block a user