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linux/drivers/usb/serial/Kconfig
Alan Cox 33f0f88f1c [PATCH] TTY layer buffering revamp 
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.

This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.

When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.

For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).

Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.

The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.

I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.

Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real.  That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.

Description:

tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification].  It
does now also return the number of chars inserted

There are also

tty_buffer_request_room(tty, len)

which asks for a buffer block of the length requested and returns the space
found.  This improves efficiency with hardware that knows how much to
transfer.

and tty_insert_flip_string_flags(tty, str, flags, len)

to insert a string of characters and flags

For a smart interface the usual code is

    len = tty_request_buffer_room(tty, amount_hardware_says);
    tty_insert_flip_string(tty, buffer_from_card, len);

More description!

At the moment tty buffers are attached directly to the tty.  This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)

I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers.  This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.

So far so good.  Lots of drivers reference tty->flip.*.  Several of them also
call directly and unsafely into function pointers it provides.  This will all
break.  Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.

At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say

 int tty_buffer_request_room(tty, size)

Try and ensure at least size bytes are available, returns actual room (may be
zero).  At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative.  (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space.  The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.

 int tty_insert_flip_char(tty, ch, flag)

As before insert a character if there is room.  Now returns 1 for success, 0
for failure.

 int tty_insert_flip_string(tty, str, len)

Insert a block of non error characters.  Returns the number inserted.

 int tty_prepare_flip_string(tty, strptr, len)

Adjust the buffer to allow len characters to be added.  Returns a buffer
pointer in strptr and the length available.  This allows for hardware that
needs to use functions like insl or mencpy_fromio.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:59 -08:00

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#
# USB Serial device configuration
#
menu "USB Serial Converter support"
depends on USB!=n
config USB_SERIAL
tristate "USB Serial Converter support"
depends on USB
---help---
Say Y here if you have a USB device that provides normal serial
ports, or acts like a serial device, and you want to connect it to
your USB bus.
Please read <file:Documentation/usb/usb-serial.txt> for more
information on the specifics of the different devices that are
supported, and on how to use them.
To compile this driver as a module, choose M here: the
module will be called usbserial.
config USB_SERIAL_CONSOLE
bool "USB Serial Console device support (EXPERIMENTAL)"
depends on USB_SERIAL=y && EXPERIMENTAL
---help---
If you say Y here, it will be possible to use a USB to serial
converter port as the system console (the system console is the
device which receives all kernel messages and warnings and which
allows logins in single user mode). This could be useful if some
terminal or printer is connected to that serial port.
Even if you say Y here, the currently visible virtual console
(/dev/tty0) will still be used as the system console by default, but
you can alter that using a kernel command line option such as
"console=ttyUSB0". (Try "man bootparam" or see the documentation of
your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.)
If you don't have a VGA card installed and you say Y here, the
kernel will automatically use the first USB to serial converter
port, /dev/ttyUSB0, as system console.
If unsure, say N.
config USB_SERIAL_GENERIC
bool "USB Generic Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use the generic USB serial driver. Please
read <file:Documentation/usb/usb-serial.txt> for more information on
using this driver. It is recommended that the "USB Serial converter
support" be compiled as a module for this driver to be used
properly.
config USB_SERIAL_AIRPRIME
tristate "USB AirPrime CDMA Wireless Driver"
depends on USB_SERIAL
help
Say Y here if you want to use a AirPrime CDMA Wireless PC card.
To compile this driver as a module, choose M here: the
module will be called airprime.
config USB_SERIAL_ANYDATA
tristate "USB AnyData CDMA Wireless Driver"
depends on USB_SERIAL
help
Say Y here if you want to use a AnyData CDMA device.
To compile this driver as a module, choose M here: the
module will be called anydata.
config USB_SERIAL_BELKIN
tristate "USB Belkin and Peracom Single Port Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use a Belkin USB Serial single port
adaptor (F5U103 is one of the model numbers) or the Peracom single
port USB to serial adapter.
To compile this driver as a module, choose M here: the
module will be called belkin_sa.
config USB_SERIAL_WHITEHEAT
tristate "USB ConnectTech WhiteHEAT Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use a ConnectTech WhiteHEAT 4 port
USB to serial converter device.
To compile this driver as a module, choose M here: the
module will be called whiteheat.
config USB_SERIAL_DIGI_ACCELEPORT
tristate "USB Digi International AccelePort USB Serial Driver"
depends on USB_SERIAL
---help---
Say Y here if you want to use Digi AccelePort USB 2 or 4 devices,
2 port (plus parallel port) and 4 port USB serial converters. The
parallel port on the USB 2 appears as a third serial port on Linux.
The Digi Acceleport USB 8 is not yet supported by this driver.
This driver works under SMP with the usb-uhci driver. It does not
work under SMP with the uhci driver.
To compile this driver as a module, choose M here: the
module will be called digi_acceleport.
config USB_SERIAL_CP2101
tristate "USB CP2101 UART Bridge Controller"
depends on USB_SERIAL && EXPERIMENTAL
help
Say Y here if you want to use a CP2101/CP2102 based USB to RS232
converter.
To compile this driver as a module, choose M here: the
module will be called cp2101.
config USB_SERIAL_CYPRESS_M8
tristate "USB Cypress M8 USB Serial Driver"
depends on USB_SERIAL && EXPERIMENTAL
help
Say Y here if you want to use a device that contains the Cypress
USB to Serial microcontroller, such as the DeLorme Earthmate GPS.
Attempted SMP support... send bug reports!
Supported microcontrollers in the CY4601 family are:
CY7C63741 CY7C63742 CY7C63743 CY7C64013
To compile this driver as a module, choose M here: the
module will be called cypress_m8.
config USB_SERIAL_EMPEG
tristate "USB Empeg empeg-car Mark I/II Driver"
depends on USB_SERIAL
help
Say Y here if you want to connect to your Empeg empeg-car Mark I/II
mp3 player via USB. The driver uses a single ttyUSB{0,1,2,...}
device node. See <file:Documentation/usb/usb-serial.txt> for more
tidbits of information.
To compile this driver as a module, choose M here: the
module will be called empeg.
config USB_SERIAL_FTDI_SIO
tristate "USB FTDI Single Port Serial Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
---help---
Say Y here if you want to use a FTDI SIO single port USB to serial
converter device. The implementation I have is called the USC-1000.
This driver has also be tested with the 245 and 232 devices.
See <http://ftdi-usb-sio.sourceforge.net/> for more
information on this driver and the device.
To compile this driver as a module, choose M here: the
module will be called ftdi_sio.
config USB_SERIAL_VISOR
tristate "USB Handspring Visor / Palm m50x / Sony Clie Driver"
depends on USB_SERIAL
help
Say Y here if you want to connect to your HandSpring Visor, Palm
m500 or m505 through its USB docking station. See
<http://usbvisor.sourceforge.net/> for more information on using this
driver.
To compile this driver as a module, choose M here: the
module will be called visor.
config USB_SERIAL_IPAQ
tristate "USB PocketPC PDA Driver"
depends on USB_SERIAL
help
Say Y here if you want to connect to your Compaq iPAQ, HP Jornada
or any other PDA running Windows CE 3.0 or PocketPC 2002
using a USB cradle/cable. For information on using the driver,
read <file:Documentation/usb/usb-serial.txt>.
To compile this driver as a module, choose M here: the
module will be called ipaq.
config USB_SERIAL_IR
tristate "USB IR Dongle Serial Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
help
Say Y here if you want to enable simple serial support for USB IrDA
devices. This is useful if you do not want to use the full IrDA
stack.
To compile this driver as a module, choose M here: the
module will be called ir-usb.
config USB_SERIAL_EDGEPORT
tristate "USB Inside Out Edgeport Serial Driver"
depends on USB_SERIAL
---help---
Say Y here if you want to use any of the following devices from
Inside Out Networks (Digi):
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
To compile this driver as a module, choose M here: the
module will be called io_edgeport.
config USB_SERIAL_EDGEPORT_TI
tristate "USB Inside Out Edgeport Serial Driver (TI devices)"
depends on USB_SERIAL
help
Say Y here if you want to use any of the devices from Inside Out
Networks (Digi) that are not supported by the io_edgeport driver.
This includes the Edgeport/1 device.
To compile this driver as a module, choose M here: the
module will be called io_ti.
config USB_SERIAL_GARMIN
tristate "USB Garmin GPS driver"
depends on USB_SERIAL
help
Say Y here if you want to connect to your Garmin GPS.
Should work with most Garmin GPS devices which have a native USB port.
See <http://sourceforge.net/projects/garmin-gps> for the latest
version of the driver.
To compile this driver as a module, choose M here: the
module will be called garmin_gps.
config USB_SERIAL_IPW
tristate "USB IPWireless (3G UMTS TDD) Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
help
Say Y here if you want to use a IPWireless USB modem such as
the ones supplied by Axity3G/Sentech South Africa.
To compile this driver as a module, choose M here: the
module will be called ipw.
config USB_SERIAL_KEYSPAN_PDA
tristate "USB Keyspan PDA Single Port Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use a Keyspan PDA single port USB to
serial converter device. This driver makes use of firmware
developed from scratch by Brian Warner.
To compile this driver as a module, choose M here: the
module will be called keyspan_pda.
config USB_SERIAL_KEYSPAN
tristate "USB Keyspan USA-xxx Serial Driver"
depends on USB_SERIAL
---help---
Say Y here if you want to use Keyspan USB to serial converter
devices. This driver makes use of Keyspan's official firmware
and was developed with their support. You must also include
firmware to support your particular device(s).
See <http://misc.nu/hugh/keyspan.html> for more information.
To compile this driver as a module, choose M here: the
module will be called keyspan.
config USB_SERIAL_KEYSPAN_MPR
bool "USB Keyspan MPR Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the Keyspan MPR converter.
config USB_SERIAL_KEYSPAN_USA28
bool "USB Keyspan USA-28 Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-28 converter.
config USB_SERIAL_KEYSPAN_USA28X
bool "USB Keyspan USA-28X Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-28X converter.
Be sure you have a USA-28X, there are also 28XA and 28XB
models, the label underneath has the actual part number.
config USB_SERIAL_KEYSPAN_USA28XA
bool "USB Keyspan USA-28XA Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-28XA converter.
Be sure you have a USA-28XA, there are also 28X and 28XB
models, the label underneath has the actual part number.
config USB_SERIAL_KEYSPAN_USA28XB
bool "USB Keyspan USA-28XB Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-28XB converter.
Be sure you have a USA-28XB, there are also 28X and 28XA
models, the label underneath has the actual part number.
config USB_SERIAL_KEYSPAN_USA19
bool "USB Keyspan USA-19 Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-19 converter.
config USB_SERIAL_KEYSPAN_USA18X
bool "USB Keyspan USA-18X Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-18X converter.
config USB_SERIAL_KEYSPAN_USA19W
bool "USB Keyspan USA-19W Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-19W converter.
config USB_SERIAL_KEYSPAN_USA19QW
bool "USB Keyspan USA-19QW Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-19QW converter.
config USB_SERIAL_KEYSPAN_USA19QI
bool "USB Keyspan USA-19QI Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-19QI converter.
config USB_SERIAL_KEYSPAN_USA49W
bool "USB Keyspan USA-49W Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-49W converter.
config USB_SERIAL_KEYSPAN_USA49WLC
bool "USB Keyspan USA-49WLC Firmware"
depends on USB_SERIAL_KEYSPAN
help
Say Y here to include firmware for the USA-49WLC converter.
config USB_SERIAL_KLSI
tristate "USB KL5KUSB105 (Palmconnect) Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
---help---
Say Y here if you want to use a KL5KUSB105 - based single port
serial adapter. The most widely known -- and currently the only
tested -- device in this category is the PalmConnect USB Serial
adapter sold by Palm Inc. for use with their Palm III and Palm V
series PDAs.
Please read <file:Documentation/usb/usb-serial.txt> for more
information.
To compile this driver as a module, choose M here: the
module will be called kl5kusb105.
config USB_SERIAL_KOBIL_SCT
tristate "USB KOBIL chipcard reader"
depends on USB_SERIAL
---help---
Say Y here if you want to use one of the following KOBIL USB chipcard
readers:
- USB TWIN
- KAAN Standard Plus
- KAAN SIM
- SecOVID Reader Plus
- B1 Professional
- KAAN Professional
Note that you need a current CT-API.
To compile this driver as a module, choose M here: the
module will be called kobil_sct.
config USB_SERIAL_MCT_U232
tristate "USB MCT Single Port Serial Driver"
depends on USB_SERIAL
---help---
Say Y here if you want to use a USB Serial single port adapter from
Magic Control Technology Corp. (U232 is one of the model numbers).
This driver also works with Sitecom U232-P25 and D-Link DU-H3SP USB
BAY devices.
To compile this driver as a module, choose M here: the
module will be called mct_u232.
config USB_SERIAL_PL2303
tristate "USB Prolific 2303 Single Port Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use the PL2303 USB Serial single port
adapter from Prolific.
To compile this driver as a module, choose M here: the
module will be called pl2303.
config USB_SERIAL_HP4X
tristate "USB HP4x Calculators support"
depends on USB_SERIAL
help
Say Y here if you want to use an Hewlett-Packard 4x Calculator.
To compile this driver as a module, choose M here: the
module will be called hp4x.
config USB_SERIAL_SAFE
tristate "USB Safe Serial (Encapsulated) Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
config USB_SERIAL_SAFE_PADDED
bool "USB Secure Encapsulated Driver - Padded"
depends on USB_SERIAL_SAFE
config USB_SERIAL_TI
tristate "USB TI 3410/5052 Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use the TI USB 3410 or 5052
serial devices.
To compile this driver as a module, choose M here: the
module will be called ti_usb_3410_5052.
config USB_SERIAL_CYBERJACK
tristate "USB REINER SCT cyberJack pinpad/e-com chipcard reader (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
---help---
Say Y here if you want to use a cyberJack pinpad/e-com USB chipcard
reader. This is an interface to ISO 7816 compatible contactbased
chipcards, e.g. GSM SIMs.
To compile this driver as a module, choose M here: the
module will be called cyberjack.
If unsure, say N.
config USB_SERIAL_XIRCOM
tristate "USB Xircom / Entregra Single Port Serial Driver"
depends on USB_SERIAL
help
Say Y here if you want to use a Xircom or Entregra single port USB to
serial converter device. This driver makes use of firmware
developed from scratch by Brian Warner.
To compile this driver as a module, choose M here: the
module will be called keyspan_pda.
config USB_SERIAL_OPTION
tristate "USB Option PCMCIA serial driver"
depends on USB_SERIAL && USB_OHCI_HCD && PCCARD
help
Say Y here if you want to use an Option card. This is a
GSM card, controlled by three serial ports which are connected
via an OHCI adapter located on a PC card.
To compile this driver as a module, choose M here: the
module will be called option.
config USB_SERIAL_OMNINET
tristate "USB ZyXEL omni.net LCD Plus Driver (EXPERIMENTAL)"
depends on USB_SERIAL && EXPERIMENTAL
help
Say Y here if you want to use a ZyXEL omni.net LCD ISDN TA.
To compile this driver as a module, choose M here: the
module will be called omninet.
config USB_EZUSB
bool
depends on USB_SERIAL_KEYSPAN_PDA || USB_SERIAL_XIRCOM || USB_SERIAL_KEYSPAN || USB_SERIAL_WHITEHEAT
default y
endmenu
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