usb-serial.txt

linux 内核源代码

INTRODUCTION

  The USB serial driver currently supports a number of different USB to
  serial converter products, as well as some devices that use a serial
  interface from userspace to talk to the device.

  See the individual product section below for specific information about
  the different devices.


CONFIGURATION

  Currently the driver can handle up to 256 different serial interfaces at
  one time. 

    The major number that the driver uses is 188 so to use the driver,
    create the following nodes:
	mknod /dev/ttyUSB0 c 188 0
	mknod /dev/ttyUSB1 c 188 1
	mknod /dev/ttyUSB2 c 188 2
	mknod /dev/ttyUSB3 c 188 3
		.
		.
		.
	mknod /dev/ttyUSB254 c 188 254
	mknod /dev/ttyUSB255 c 188 255

  When the device is connected and recognized by the driver, the driver
  will print to the system log, which node(s) the device has been bound
  to.
  

SPECIFIC DEVICES SUPPORTED


ConnectTech WhiteHEAT 4 port converter

  ConnectTech has been very forthcoming with information about their
  device, including providing a unit to test with.

  The driver is officially supported by Connect Tech Inc.
  http://www.connecttech.com

  For any questions or problems with this driver, please contact
  Connect Tech's Support Department at [e-mail]


HandSpring Visor, Palm USB, and Clié USB driver

  This driver works with all HandSpring USB, Palm USB, and Sony Clié USB
  devices.

  Only when the device tries to connect to the host, will the device show
  up to the host as a valid USB device. When this happens, the device is
  properly enumerated, assigned a port, and then communication _should_ be
  possible. The driver cleans up properly when the device is removed, or
  the connection is canceled on the device.

  NOTE:
    This means that in order to talk to the device, the sync button must be
    pressed BEFORE trying to get any program to communicate to the device.
    This goes against the current documentation for pilot-xfer and other
    packages, but is the only way that it will work due to the hardware
    in the device.
  
  When the device is connected, try talking to it on the second port
  (this is usually /dev/ttyUSB1 if you do not have any other usb-serial
  devices in the system.) The system log should tell you which port is
  the port to use for the HotSync transfer. The "Generic" port can be used
  for other device communication, such as a PPP link.

  For some Sony Clié devices, /dev/ttyUSB0 must be used to talk to the
  device.  This is true for all OS version 3.5 devices, and most devices
  that have had a flash upgrade to a newer version of the OS.  See the
  kernel system log for information on which is the correct port to use.

  If after pressing the sync button, nothing shows up in the system log,
  try resetting the device, first a hot reset, and then a cold reset if
  necessary.  Some devices need this before they can talk to the USB port
  properly.
  
  Devices that are not compiled into the kernel can be specified with module
  parameters.  e.g. modprobe visor vendor=0x54c product=0x66
  
  There is a webpage and mailing lists for this portion of the driver at:
  http://usbvisor.sourceforge.net/

  For any questions or problems with this driver, please contact Greg
  Kroah-Hartman at [e-mail]


PocketPC PDA Driver

  This driver can be used to connect to Compaq iPAQ, HP Jornada, Casio EM500
  and other PDAs running Windows CE 3.0 or PocketPC 2002 using a USB
  cable/cradle.
  Most devices supported by ActiveSync are supported out of the box.
  For others, please use module parameters to specify the product and vendor
  id. e.g. modprobe ipaq vendor=0x3f0 product=0x1125

  The driver presents a serial interface (usually on /dev/ttyUSB0) over
  which one may run ppp and establish a TCP/IP link to the PDA. Once this
  is done, you can transfer files, backup, download email etc. The most
  significant advantage of using USB is speed - I can get 73 to 113
  kbytes/sec for download/upload to my iPAQ.

  This driver is only one of a set of components required to utilize
  the USB connection. Please visit http://synce.sourceforge.net which
  contains the necessary packages and a simple step-by-step howto.

  Once connected, you can use Win CE programs like ftpView, Pocket Outlook
  from the PDA and xcerdisp, synce utilities from the Linux side.

  To use Pocket IE, follow the instructions given at
  http://www.tekguru.co.uk/EM500/usbtonet.htm to achieve the same thing
  on Win98. Omit the proxy server part; Linux is quite capable of forwarding
  packets unlike Win98. Another modification is required at least for the
  iPAQ - disable autosync by going to the Start/Settings/Connections menu
  and unchecking the "Automatically synchronize ..." box. Go to
  Start/Programs/Connections, connect the cable and select "usbdial" (or
  whatever you named your new USB connection). You should finally wind
  up with a "Connected to usbdial" window with status shown as connected.
  Now start up PIE and browse away.

  If it doesn't work for some reason, load both the usbserial and ipaq module
  with the module parameter "debug" set to 1 and examine the system log.
  You can also try soft-resetting your PDA before attempting a connection.

  Other functionality may be possible depending on your PDA. According to
  Wes Cilldhaire <[e-mail]>, with the Toshiba E570,
  ...if you boot into the bootloader (hold down the power when hitting the
  reset button, continuing to hold onto the power until the bootloader screen
  is displayed), then put it in the cradle with the ipaq driver loaded, open
  a terminal on /dev/ttyUSB0, it gives you a "USB Reflash" terminal, which can
  be used to flash the ROM, as well as the microP code..  so much for needing
  Toshiba's $350 serial cable for flashing!! :D
  NOTE: This has NOT been tested. Use at your own risk.
 
  For any questions or problems with the driver, please contact Ganesh
  Varadarajan <[e-mail]>


Keyspan PDA Serial Adapter

  Single port DB-9 serial adapter, pushed as a PDA adapter for iMacs (mostly
  sold in Macintosh catalogs, comes in a translucent white/green dongle).
  Fairly simple device. Firmware is homebrew.
  This driver also works for the Xircom/Entrgra single port serial adapter.

  Current status:
   Things that work:
     basic input/output (tested with 'cu')
     blocking write when serial line can't keep up
     changing baud rates (up to 115200)
     getting/setting modem control pins (TIOCM{GET,SET,BIS,BIC})
     sending break (although duration looks suspect)
   Things that don't:
     device strings (as logged by kernel) have trailing binary garbage
     device ID isn't right, might collide with other Keyspan products
     changing baud rates ought to flush tx/rx to avoid mangled half characters
   Big Things on the todo list:
     parity, 7 vs 8 bits per char, 1 or 2 stop bits
     HW flow control
     not all of the standard USB descriptors are handled: Get_Status, Set_Feature
     O_NONBLOCK, select()

  For any questions or problems with this driver, please contact Brian
  Warner at [e-mail] 


Keyspan USA-series Serial Adapters

  Single, Dual and Quad port adapters - driver uses Keyspan supplied 
  firmware and is being developed with their support.
  
  Current status:
    The USA-18X, USA-28X, USA-19, USA-19W and USA-49W are supported and
    have been pretty thoroughly tested at various baud rates with 8-N-1
    character settings.  Other character lengths and parity setups are
    presently untested.

    The USA-28 isn't yet supported though doing so should be pretty
    straightforward.  Contact the maintainer if you require this
    functionality.
  
  More information is available at:
        http://misc.nu/hugh/keyspan.html
   
  For any questions or problems with this driver, please contact Hugh
  Blemings at [e-mail]


FTDI Single Port Serial Driver

  This is a single port DB-25 serial adapter. More information about this
  device and the Linux driver can be found at:
	http://reality.sgi.com/bryder_wellington/ftdi_sio/

  For any questions or problems with this driver, please contact Bill Ryder
  at [e-mail]


ZyXEL omni.net lcd plus ISDN TA

  This is an ISDN TA. Please report both successes and troubles to
  [e-mail]


Cypress M8 CY4601 Family Serial Driver

  This driver was in most part developed by Neil "koyama" Whelchel.  It
  has been improved since that previous form to support dynamic serial
  line settings and improved line handling.  The driver is for the most
  part stable and has been tested on an smp machine. (dual p2)

    Chipsets supported under CY4601 family:
	
		CY7C63723, CY7C63742, CY7C63743, CY7C64013

    Devices supported:

		-DeLorme's USB Earthmate (SiRF Star II lp arch)
		-Cypress HID->COM RS232 adapter
	
		Note: Cypress Semiconductor claims no affiliation with the
			hid->com device.

	Most devices using chipsets under the CY4601 family should
     work with the driver.  As long as they stay true to the CY4601
     usbserial specification.

    Technical notes:

        The Earthmate starts out at 4800 8N1 by default... the driver will
	upon start init to this setting.  usbserial core provides the rest
	of the termios settings, along with some custom termios so that the
	output is in proper format and parsable.