NUSB(4)                                                   NUSB(4)

     NAME
          audio, disk, ether, kb, serial, ptp, usbd - Universal Serial
          Bus drivers

     SYNOPSIS
          nusb/audio devid

          nusb/disk [ -d ] devid

          nusb/ether [ -dD ] [ -t ethertype ] [ -a addr ] devid

          nusb/kb [ -d ] devid

          nusb/serial [ -d ] devid

          nusb/ptp [ -dD ] devid

          nusb/usbd [ -dD ]

     DESCRIPTION
          These programs drive USB devices of specific classes via
          usb(3). Usually they are started by nusbrc(8) upon attach-
          ment of the device to the bus. All drivers except usbd take
          the decimal usb devid of the device they should handle as
          ther last argument. A driver's instance handles only one
          device at a time.

          Drivers that provide file systems make them available as
          shares under /shr (see shr(3)) or /shr/usb (which is bound
          after /dev by nusbrc(8)).

          Options -d and -D trigger debug diagnostics and file system
          debugging diagnostics for most drivers. Repeating any one of
          these may increase verbosity.

        Hubs
          Usbd enumerates the tree of USB hubs and configures the
          device on attachment. It provides a filesystem with the file
          usbevent (usually seen as /dev/usbevent) which, when read,
          returns a 6 column, space separated line of text, one for
          each event. The columns are: attach or detach followed by
          addr vid did csp and hname . The addr is the decimal device
          address assigned.  Vid and did are formatted as 4 digit hex-
          adecimal.  Csp is the device class, subclass, protocol
          indentifier formatd as 6 digit hexadecimal.  Usbd assigns a
          stable device unique name based on the device descriptor for
          hname . This information is read by nusbrc(8) and the addr
          and hname are passed to a suitable driver as devid in the
          form addr:hname

     NUSB(4)                                                   NUSB(4)

        Keyboards and mice
          Kb supports USB keyboards and mice either as separate USB
          devices or as a single combined USB device.  Scan codes from
          the keyboard are sent to /dev/kbin to let kbdfs(8) process
          them.  Mouse events are sent to /dev/mousein in the same
          way.

        Disks
          Disk configures and manages USB mass storage devices. It
          provides a file system (usually seen under /dev) that
          includes one directory per storage device, named sdUN[.M] in
          correspondence with the usb device unique name and the stor-
          age unit number (or LUN). The LUN is omited for single lun
          devices.

          The storage device directory contains the usual files served
          by sd(3): data, raw, and ctl.

          The ctl file supplies the device geometry and partitions
          when read.

        Ethernet
          Ether handles USB ethernet devices. The file system provided
          is compatible to ether(3) and added to the share usbnet (see
          shr(3)) which is bound after /net by nusbrc(8) so the device
          will appear as /net/etherUN.  Without specifying the -t
          option, the device is assumed to be a CDC compliant ethernet
          communication device. Other devices might require setting an
          explicit ethertype, such as rndis, smsc, a88772 or a88178
          (see nusbrc(8)). On devices that support it, the mac address
          can be set using the -a addr option.

        Serial and JTAG ports
          Serial provides a file system (usually seen under /dev) that
          includes one directory per USB serial port, named eiaUN or
          eiaUN[.M].  In this directory there are two files, eiaU,
          similar to eiaN in uart(3), and eiaUctl, which admits writes
          in the same format as eiaNctl in uart(3). Reading from
          eiaUctl gives the serial port's settings in the same format
          as eiaNstatus in uart(3). Options are similar to those of
          disk.

          JTAG ports are similar but the files are named jtag and
          jtagctl.

        Audio devices
          Audio configures and manages a USB audio device.  It imple-
          ments a file system, (normally seen under /dev) compatible
          to audio(3).

     SOURCE
          /sys/src/cmd/nusb

     NUSB(4)                                                   NUSB(4)

     SEE ALSO
          audio(3), ether(3), mouse(3), sd(3), uart(3), usb(3),
          shr(3), nusbrc(8), kbdfs(8)

     BUGS
          The various device drivers are generic USB drivers and may
          work only for certain devices of each class.

          USB ATA storage devices are not supported.

          The serial driver works only for the Prolific chip and Ftdi,
          and control of the dcd and dsr signals and some of the extra
          features are not implemented.  For Ftdi, only the Sheevaplug
          and Guruplug have been tried.  There is support for the EHCI
          debug port, but it loses bytes.