Documentation/usb/usb-serial.rst - linux - Git at Google

 ==========
 USB serial
 ==========

 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 support@connecttech.com


 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://sourceforge.net/projects/usbvisor/

   For any questions or problems with this driver, please contact Greg
   Kroah-Hartman at greg@kroah.com


 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 <billybobjoehenrybob@hotmail.com>, 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 <ganesh@veritas.com>


 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/Entrega 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 warner@lothar.com


 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://www.carnationsoftware.com/carnation/Keyspan.html

   For any questions or problems with this driver, please contact Hugh
   Blemings at hugh@misc.nu


 FTDI Single Port Serial Driver
 ------------------------------

   This is a single port DB-25 serial adapter.

   Devices supported include:

                 - TripNav TN-200 USB GPS
                 - Navis Engineering Bureau CH-4711 USB GPS

   For any questions or problems with this driver, please contact Bill Ryder.


 ZyXEL omni.net lcd plus ISDN TA
 -------------------------------

   This is an ISDN TA. Please report both successes and troubles to
   azummo@towertech.it


 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 GPS (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.

 	The device can be put into sirf mode by issuing NMEA command::

 		$PSRF100,<protocol>,<baud>,<databits>,<stopbits>,<parity>*CHECKSUM
 		$PSRF100,0,9600,8,1,0*0C

 		It should then be sufficient to change the port termios to match this
 		to begin communicating.

 	As far as I can tell it supports pretty much every sirf command as
 	documented online available with firmware 2.31, with some unknown
 	message ids.

 	The hid->com adapter can run at a maximum baud of 115200bps.  Please note
 	that the device has trouble or is incapable of raising line voltage properly.
 	It will be fine with null modem links, as long as you do not try to link two
 	together without hacking the adapter to set the line high.

 	The driver is smp safe.  Performance with the driver is rather low when using
 	it for transferring files.  This is being worked on, but I would be willing to
 	accept patches.  An urb queue or packet buffer would likely fit the bill here.

 	If you have any questions, problems, patches, feature requests, etc. you can
 	contact me here via email:

 					dignome@gmail.com

 		(your problems/patches can alternately be submitted to usb-devel)


 Digi AccelePort Driver
 ----------------------

   This driver supports the Digi AccelePort USB 2 and 4 devices, 2 port
   (plus a parallel port) and 4 port USB serial converters.  The driver
   does NOT yet support the Digi AccelePort USB 8.

   This driver works under SMP with the usb-uhci driver.  It does not
   work under SMP with the uhci driver.

   The driver is generally working, though we still have a few more ioctls
   to implement and final testing and debugging to do.  The parallel port
   on the USB 2 is supported as a serial to parallel converter; in other
   words, it appears as another USB serial port on Linux, even though
   physically it is really a parallel port.  The Digi Acceleport USB 8
   is not yet supported.

   Please contact Peter Berger (pberger@brimson.com) or Al Borchers
   (alborchers@steinerpoint.com) for questions or problems with this
   driver.


 Belkin USB Serial Adapter F5U103
 --------------------------------

   Single port DB-9/PS-2 serial adapter from Belkin with firmware by eTEK Labs.
   The Peracom single port serial adapter also works with this driver, as
   well as the GoHubs adapter.

   Current status:

     The following have been tested and work:

       - Baud rate    300-230400
       - Data bits    5-8
       - Stop bits    1-2
       - Parity       N,E,O,M,S
       - Handshake    None, Software (XON/XOFF), Hardware (CTSRTS,CTSDTR) [1]_
       - Break        Set and clear
       - Line control Input/Output query and control [2]_

   .. [1]
          Hardware input flow control is only enabled for firmware
          levels above 2.06.  Read source code comments describing Belkin
          firmware errata.  Hardware output flow control is working for all
          firmware versions.

   .. [2]
          Queries of inputs (CTS,DSR,CD,RI) show the last
          reported state.  Queries of outputs (DTR,RTS) show the last
          requested state and may not reflect current state as set by
          automatic hardware flow control.

   TO DO List:
     - Add true modem control line query capability.  Currently tracks the
       states reported by the interrupt and the states requested.
     - Add error reporting back to application for UART error conditions.
     - Add support for flush ioctls.
     - Add everything else that is missing :)

   For any questions or problems with this driver, please contact William
   Greathouse at wgreathouse@smva.com


 Empeg empeg-car Mark I/II Driver
 --------------------------------

   This is an experimental driver to provide connectivity support for the
   client synchronization tools for an Empeg empeg-car mp3 player.

   Tips:
     * Don't forget to create the device nodes for ttyUSB{0,1,2,...}
     * modprobe empeg (modprobe is your friend)
     * emptool --usb /dev/ttyUSB0 (or whatever you named your device node)

   For any questions or problems with this driver, please contact Gary
   Brubaker at xavyer@ix.netcom.com


 MCT USB Single Port Serial Adapter U232
 ---------------------------------------

   This driver is for the MCT USB-RS232 Converter (25 pin, Model No.
   U232-P25) from Magic Control Technology Corp. (there is also a 9 pin
   Model No. U232-P9). More information about this device can be found at
   the manufacturer's web-site: http://www.mct.com.tw.

   The driver is generally working, though it still needs some more testing.
   It is derived from the Belkin USB Serial Adapter F5U103 driver and its
   TODO list is valid for this driver as well.

   This driver has also been found to work for other products, which have
   the same Vendor ID but different Product IDs. Sitecom's U232-P25 serial
   converter uses Product ID 0x230 and Vendor ID 0x711 and works with this
   driver. Also, D-Link's DU-H3SP USB BAY also works with this driver.

   For any questions or problems with this driver, please contact Wolfgang
   Grandegger at wolfgang@ces.ch


 Inside Out Networks Edgeport Driver
 -----------------------------------

   This driver supports all devices made by Inside Out Networks, specifically
   the following models:

        - Edgeport/4
        - Rapidport/4
        - Edgeport/4t
        - Edgeport/2
        - Edgeport/4i
        - Edgeport/2i
        - Edgeport/421
        - Edgeport/21
        - Edgeport/8
        - Edgeport/8 Dual
        - Edgeport/2D8
        - Edgeport/4D8
        - Edgeport/8i
        - Edgeport/2 DIN
        - Edgeport/4 DIN
        - Edgeport/16 Dual

   For any questions or problems with this driver, please contact Greg
   Kroah-Hartman at greg@kroah.com


 REINER SCT cyberJack pinpad/e-com USB chipcard reader
 -----------------------------------------------------

   Interface to ISO 7816 compatible contactbased chipcards, e.g. GSM SIMs.

   Current status:

     This is the kernel part of the driver for this USB card reader.
     There is also a user part for a CT-API driver available. A site
     for downloading is TBA. For now, you can request it from the
     maintainer (linux-usb@sii.li).

   For any questions or problems with this driver, please contact
   linux-usb@sii.li


 Prolific PL2303 Driver
 ----------------------

   This driver supports any device that has the PL2303 chip from Prolific
   in it.  This includes a number of single port USB to serial converters,
   more than 70% of USB GPS devices (in 2010), and some USB UPSes. Devices
   from Aten (the UC-232) and IO-Data work with this driver, as does
   the DCU-11 mobile-phone cable.

   For any questions or problems with this driver, please contact Greg
   Kroah-Hartman at greg@kroah.com


 KL5KUSB105 chipset / PalmConnect USB single-port adapter
 --------------------------------------------------------

 Current status:

   The driver was put together by looking at the usb bus transactions
   done by Palm's driver under Windows, so a lot of functionality is
   still missing.  Notably, serial ioctls are sometimes faked or not yet
   implemented.  Support for finding out about DSR and CTS line status is
   however implemented (though not nicely), so your favorite autopilot(1)
   and pilot-manager -daemon calls will work.  Baud rates up to 115200
   are supported, but handshaking (software or hardware) is not, which is
   why it is wise to cut down on the rate used is wise for large
   transfers until this is settled.

   See http://www.uuhaus.de/linux/palmconnect.html for up-to-date
   information on this driver.

 Winchiphead CH341 Driver
 ------------------------

   This driver is for the Winchiphead CH341 USB-RS232 Converter. This chip
   also implements an IEEE 1284 parallel port, I2C and SPI, but that is not
   supported by the driver. The protocol was analyzed from the behaviour
   of the Windows driver, no datasheet is available at present.

   The manufacturer's website: http://www.winchiphead.com/.

   For any questions or problems with this driver, please contact
   frank@kingswood-consulting.co.uk.

 Moschip MCS7720, MCS7715 driver
 -------------------------------

   These chips are present in devices sold by various manufacturers, such as Syba
   and Cables Unlimited.  There may be others.  The 7720 provides two serial
   ports, and the 7715 provides one serial and one standard PC parallel port.
   Support for the 7715's parallel port is enabled by a separate option, which
   will not appear unless parallel port support is first enabled at the top-level
   of the Device Drivers config menu.  Currently only compatibility mode is
   supported on the parallel port (no ECP/EPP).

   TODO:
     - Implement ECP/EPP modes for the parallel port.
     - Baud rates higher than 115200 are currently broken.
     - Devices with a single serial port based on the Moschip MCS7703 may work
       with this driver with a simple addition to the usb_device_id table.  I
       don't have one of these devices, so I can't say for sure.

 Generic Serial driver
 ---------------------

   If your device is not one of the above listed devices, compatible with
   the above models, you can try out the "generic" interface. This
   interface does not provide any type of control messages sent to the
   device, and does not support any kind of device flow control. All that
   is required of your device is that it has at least one bulk in endpoint,
   or one bulk out endpoint.

   To enable the generic driver to recognize your device, provide::

 	echo <vid> <pid> >/sys/bus/usb-serial/drivers/generic/new_id

   where the <vid> and <pid> is replaced with the hex representation of your
   device's vendor id and product id.
   If the driver is compiled as a module you can also provide one id when
   loading the module::

 	insmod usbserial vendor=0x#### product=0x####

   This driver has been successfully used to connect to the NetChip USB
   development board, providing a way to develop USB firmware without
   having to write a custom driver.

   For any questions or problems with this driver, please contact Greg
   Kroah-Hartman at greg@kroah.com


 Contact
 =======

   If anyone has any problems using these drivers, with any of the above
   specified products, please contact the specific driver's author listed
   above, or join the Linux-USB mailing list (information on joining the
   mailing list, as well as a link to its searchable archive is at
   http://www.linux-usb.org/ )


 Greg Kroah-Hartman
 greg@kroah.com
	==========
	USB serial
	==========

	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 support@connecttech.com


	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://sourceforge.net/projects/usbvisor/

	For any questions or problems with this driver, please contact Greg
	Kroah-Hartman at greg@kroah.com


	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 <billybobjoehenrybob@hotmail.com>, 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 <ganesh@veritas.com>


	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/Entrega 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 warner@lothar.com


	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://www.carnationsoftware.com/carnation/Keyspan.html

	For any questions or problems with this driver, please contact Hugh
	Blemings at hugh@misc.nu


	FTDI Single Port Serial Driver
	------------------------------

	This is a single port DB-25 serial adapter.

	Devices supported include:

	- TripNav TN-200 USB GPS
	- Navis Engineering Bureau CH-4711 USB GPS

	For any questions or problems with this driver, please contact Bill Ryder.


	ZyXEL omni.net lcd plus ISDN TA
	-------------------------------

	This is an ISDN TA. Please report both successes and troubles to
	azummo@towertech.it


	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 GPS (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.

	The device can be put into sirf mode by issuing NMEA command::

	$PSRF100,<protocol>,<baud>,<databits>,<stopbits>,<parity>*CHECKSUM
	$PSRF100,0,9600,8,1,0*0C

	It should then be sufficient to change the port termios to match this
	to begin communicating.

	As far as I can tell it supports pretty much every sirf command as
	documented online available with firmware 2.31, with some unknown
	message ids.

	The hid->com adapter can run at a maximum baud of 115200bps. Please note
	that the device has trouble or is incapable of raising line voltage properly.
	It will be fine with null modem links, as long as you do not try to link two
	together without hacking the adapter to set the line high.

	The driver is smp safe. Performance with the driver is rather low when using
	it for transferring files. This is being worked on, but I would be willing to
	accept patches. An urb queue or packet buffer would likely fit the bill here.

	If you have any questions, problems, patches, feature requests, etc. you can
	contact me here via email:

	dignome@gmail.com

	(your problems/patches can alternately be submitted to usb-devel)


	Digi AccelePort Driver
	----------------------

	This driver supports the Digi AccelePort USB 2 and 4 devices, 2 port
	(plus a parallel port) and 4 port USB serial converters. The driver
	does NOT yet support the Digi AccelePort USB 8.

	This driver works under SMP with the usb-uhci driver. It does not
	work under SMP with the uhci driver.

	The driver is generally working, though we still have a few more ioctls
	to implement and final testing and debugging to do. The parallel port
	on the USB 2 is supported as a serial to parallel converter; in other
	words, it appears as another USB serial port on Linux, even though
	physically it is really a parallel port. The Digi Acceleport USB 8
	is not yet supported.

	Please contact Peter Berger (pberger@brimson.com) or Al Borchers
	(alborchers@steinerpoint.com) for questions or problems with this
	driver.


	Belkin USB Serial Adapter F5U103
	--------------------------------

	Single port DB-9/PS-2 serial adapter from Belkin with firmware by eTEK Labs.
	The Peracom single port serial adapter also works with this driver, as
	well as the GoHubs adapter.

	Current status:

	The following have been tested and work:

	- Baud rate 300-230400
	- Data bits 5-8
	- Stop bits 1-2
	- Parity N,E,O,M,S
	- Handshake None, Software (XON/XOFF), Hardware (CTSRTS,CTSDTR) [1]_
	- Break Set and clear
	- Line control Input/Output query and control [2]_

	.. [1]
	Hardware input flow control is only enabled for firmware
	levels above 2.06. Read source code comments describing Belkin
	firmware errata. Hardware output flow control is working for all
	firmware versions.

	.. [2]
	Queries of inputs (CTS,DSR,CD,RI) show the last
	reported state. Queries of outputs (DTR,RTS) show the last
	requested state and may not reflect current state as set by
	automatic hardware flow control.

	TO DO List:
	- Add true modem control line query capability. Currently tracks the
	states reported by the interrupt and the states requested.
	- Add error reporting back to application for UART error conditions.
	- Add support for flush ioctls.
	- Add everything else that is missing :)

	For any questions or problems with this driver, please contact William
	Greathouse at wgreathouse@smva.com


	Empeg empeg-car Mark I/II Driver
	--------------------------------

	This is an experimental driver to provide connectivity support for the
	client synchronization tools for an Empeg empeg-car mp3 player.

	Tips:
	* Don't forget to create the device nodes for ttyUSB{0,1,2,...}
	* modprobe empeg (modprobe is your friend)
	* emptool --usb /dev/ttyUSB0 (or whatever you named your device node)

	For any questions or problems with this driver, please contact Gary
	Brubaker at xavyer@ix.netcom.com


	MCT USB Single Port Serial Adapter U232
	---------------------------------------

	This driver is for the MCT USB-RS232 Converter (25 pin, Model No.
	U232-P25) from Magic Control Technology Corp. (there is also a 9 pin
	Model No. U232-P9). More information about this device can be found at
	the manufacturer's web-site: http://www.mct.com.tw.

	The driver is generally working, though it still needs some more testing.
	It is derived from the Belkin USB Serial Adapter F5U103 driver and its
	TODO list is valid for this driver as well.

	This driver has also been found to work for other products, which have
	the same Vendor ID but different Product IDs. Sitecom's U232-P25 serial
	converter uses Product ID 0x230 and Vendor ID 0x711 and works with this
	driver. Also, D-Link's DU-H3SP USB BAY also works with this driver.

	For any questions or problems with this driver, please contact Wolfgang
	Grandegger at wolfgang@ces.ch


	Inside Out Networks Edgeport Driver
	-----------------------------------

	This driver supports all devices made by Inside Out Networks, specifically
	the following models:

	- Edgeport/4
	- Rapidport/4
	- Edgeport/4t
	- Edgeport/2
	- Edgeport/4i
	- Edgeport/2i
	- Edgeport/421
	- Edgeport/21
	- Edgeport/8
	- Edgeport/8 Dual
	- Edgeport/2D8
	- Edgeport/4D8
	- Edgeport/8i
	- Edgeport/2 DIN
	- Edgeport/4 DIN
	- Edgeport/16 Dual

	For any questions or problems with this driver, please contact Greg
	Kroah-Hartman at greg@kroah.com


	REINER SCT cyberJack pinpad/e-com USB chipcard reader
	-----------------------------------------------------

	Interface to ISO 7816 compatible contactbased chipcards, e.g. GSM SIMs.

	Current status:

	This is the kernel part of the driver for this USB card reader.
	There is also a user part for a CT-API driver available. A site
	for downloading is TBA. For now, you can request it from the
	maintainer (linux-usb@sii.li).

	For any questions or problems with this driver, please contact
	linux-usb@sii.li


	Prolific PL2303 Driver
	----------------------

	This driver supports any device that has the PL2303 chip from Prolific
	in it. This includes a number of single port USB to serial converters,
	more than 70% of USB GPS devices (in 2010), and some USB UPSes. Devices
	from Aten (the UC-232) and IO-Data work with this driver, as does
	the DCU-11 mobile-phone cable.

	For any questions or problems with this driver, please contact Greg
	Kroah-Hartman at greg@kroah.com


	KL5KUSB105 chipset / PalmConnect USB single-port adapter
	--------------------------------------------------------

	Current status:

	The driver was put together by looking at the usb bus transactions
	done by Palm's driver under Windows, so a lot of functionality is
	still missing. Notably, serial ioctls are sometimes faked or not yet
	implemented. Support for finding out about DSR and CTS line status is
	however implemented (though not nicely), so your favorite autopilot(1)
	and pilot-manager -daemon calls will work. Baud rates up to 115200
	are supported, but handshaking (software or hardware) is not, which is
	why it is wise to cut down on the rate used is wise for large
	transfers until this is settled.

	See http://www.uuhaus.de/linux/palmconnect.html for up-to-date
	information on this driver.

	Winchiphead CH341 Driver
	------------------------

	This driver is for the Winchiphead CH341 USB-RS232 Converter. This chip
	also implements an IEEE 1284 parallel port, I2C and SPI, but that is not
	supported by the driver. The protocol was analyzed from the behaviour
	of the Windows driver, no datasheet is available at present.

	The manufacturer's website: http://www.winchiphead.com/.

	For any questions or problems with this driver, please contact
	frank@kingswood-consulting.co.uk.

	Moschip MCS7720, MCS7715 driver
	-------------------------------

	These chips are present in devices sold by various manufacturers, such as Syba
	and Cables Unlimited. There may be others. The 7720 provides two serial
	ports, and the 7715 provides one serial and one standard PC parallel port.
	Support for the 7715's parallel port is enabled by a separate option, which
	will not appear unless parallel port support is first enabled at the top-level
	of the Device Drivers config menu. Currently only compatibility mode is
	supported on the parallel port (no ECP/EPP).

	TODO:
	- Implement ECP/EPP modes for the parallel port.
	- Baud rates higher than 115200 are currently broken.
	- Devices with a single serial port based on the Moschip MCS7703 may work
	with this driver with a simple addition to the usb_device_id table. I
	don't have one of these devices, so I can't say for sure.

	Generic Serial driver
	---------------------

	If your device is not one of the above listed devices, compatible with
	the above models, you can try out the "generic" interface. This
	interface does not provide any type of control messages sent to the
	device, and does not support any kind of device flow control. All that
	is required of your device is that it has at least one bulk in endpoint,
	or one bulk out endpoint.

	To enable the generic driver to recognize your device, provide::

	echo <vid> <pid> >/sys/bus/usb-serial/drivers/generic/new_id

	where the <vid> and <pid> is replaced with the hex representation of your
	device's vendor id and product id.
	If the driver is compiled as a module you can also provide one id when
	loading the module::

	insmod usbserial vendor=0x#### product=0x####

	This driver has been successfully used to connect to the NetChip USB
	development board, providing a way to develop USB firmware without
	having to write a custom driver.

	For any questions or problems with this driver, please contact Greg
	Kroah-Hartman at greg@kroah.com


	Contact
	=======

	If anyone has any problems using these drivers, with any of the above
	specified products, please contact the specific driver's author listed
	above, or join the Linux-USB mailing list (information on joining the
	mailing list, as well as a link to its searchable archive is at
	http://www.linux-usb.org/ )


	Greg Kroah-Hartman
	greg@kroah.com