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linux-next/drivers/char/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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#
# Character device configuration
#
menu "Character devices"
config VT
bool "Virtual terminal" if EMBEDDED
select INPUT
default y if !VIOCONS
---help---
If you say Y here, you will get support for terminal devices with
display and keyboard devices. These are called "virtual" because you
can run several virtual terminals (also called virtual consoles) on
one physical terminal. This is rather useful, for example one
virtual terminal can collect system messages and warnings, another
one can be used for a text-mode user session, and a third could run
an X session, all in parallel. Switching between virtual terminals
is done with certain key combinations, usually Alt-<function key>.
The setterm command ("man setterm") can be used to change the
properties (such as colors or beeping) of a virtual terminal. The
man page console_codes(4) ("man console_codes") contains the special
character sequences that can be used to change those properties
directly. The fonts used on virtual terminals can be changed with
the setfont ("man setfont") command and the key bindings are defined
with the loadkeys ("man loadkeys") command.
You need at least one virtual terminal device in order to make use
of your keyboard and monitor. Therefore, only people configuring an
embedded system would want to say N here in order to save some
memory; the only way to log into such a system is then via a serial
or network connection.
If unsure, say Y, or else you won't be able to do much with your new
shiny Linux system :-)
config VT_CONSOLE
bool "Support for console on virtual terminal" if EMBEDDED
depends on VT
default y
---help---
The system console is the device which receives all kernel messages
and warnings and which allows logins in single user mode. If you
answer Y here, a virtual terminal (the device used to interact with
a physical terminal) can be used as system console. This is the most
common mode of operations, so you should say Y here unless you want
the kernel messages be output only to a serial port (in which case
you should say Y to "Console on serial port", below).
If you do say Y here, by default the currently visible virtual
terminal (/dev/tty0) will be used as system console. You can change
that with a kernel command line option such as "console=tty3" which
would use the third virtual terminal as system console. (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 unsure, say Y.
config HW_CONSOLE
bool
depends on VT && !S390 && !UML
default y
config SERIAL_NONSTANDARD
bool "Non-standard serial port support"
---help---
Say Y here if you have any non-standard serial boards -- boards
which aren't supported using the standard "dumb" serial driver.
This includes intelligent serial boards such as Cyclades,
Digiboards, etc. These are usually used for systems that need many
serial ports because they serve many terminals or dial-in
connections.
Note that the answer to this question won't directly affect the
kernel: saying N will just cause the configurator to skip all
the questions about non-standard serial boards.
Most people can say N here.
config COMPUTONE
tristate "Computone IntelliPort Plus serial support"
depends on SERIAL_NONSTANDARD
---help---
This driver supports the entire family of Intelliport II/Plus
controllers with the exception of the MicroChannel controllers and
products previous to the Intelliport II. These are multiport cards,
which give you many serial ports. You would need something like this
to connect more than two modems to your Linux box, for instance in
order to become a dial-in server. If you have a card like that, say
Y here and read <file:Documentation/computone.txt>.
To compile this driver as modules, choose M here: the
modules will be called ip2 and ip2main.
config ROCKETPORT
tristate "Comtrol RocketPort support"
depends on SERIAL_NONSTANDARD
help
This driver supports Comtrol RocketPort and RocketModem PCI boards.
These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
modems. For information about the RocketPort/RocketModem boards
and this driver read <file:Documentation/rocket.txt>.
To compile this driver as a module, choose M here: the
module will be called rocket.
If you want to compile this driver into the kernel, say Y here. If
you don't have a Comtrol RocketPort/RocketModem card installed, say N.
config CYCLADES
tristate "Cyclades async mux support"
depends on SERIAL_NONSTANDARD
---help---
This driver supports Cyclades Z and Y multiserial boards.
You would need something like this to connect more than two modems to
your Linux box, for instance in order to become a dial-in server.
For information about the Cyclades-Z card, read
<file:drivers/char/README.cycladesZ>.
To compile this driver as a module, choose M here: the
module will be called cyclades.
If you haven't heard about it, it's safe to say N.
config CYZ_INTR
bool "Cyclades-Z interrupt mode operation (EXPERIMENTAL)"
depends on EXPERIMENTAL && CYCLADES
help
The Cyclades-Z family of multiport cards allows 2 (two) driver op
modes: polling and interrupt. In polling mode, the driver will check
the status of the Cyclades-Z ports every certain amount of time
(which is called polling cycle and is configurable). In interrupt
mode, it will use an interrupt line (IRQ) in order to check the
status of the Cyclades-Z ports. The default op mode is polling. If
unsure, say N.
config DIGIEPCA
tristate "Digiboard Intelligent Async Support"
depends on SERIAL_NONSTANDARD
---help---
This is a driver for Digi International's Xx, Xeve, and Xem series
of cards which provide multiple serial ports. You would need
something like this to connect more than two modems to your Linux
box, for instance in order to become a dial-in server. This driver
supports the original PC (ISA) boards as well as PCI, and EISA. If
you have a card like this, say Y here and read the file
<file:Documentation/digiepca.txt>.
To compile this driver as a module, choose M here: the
module will be called epca.
config ESPSERIAL
tristate "Hayes ESP serial port support"
depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API
help
This is a driver which supports Hayes ESP serial ports. Both single
port cards and multiport cards are supported. Make sure to read
<file:Documentation/hayes-esp.txt>.
To compile this driver as a module, choose M here: the
module will be called esp.
If unsure, say N.
config MOXA_INTELLIO
tristate "Moxa Intellio support"
depends on SERIAL_NONSTANDARD
help
Say Y here if you have a Moxa Intellio multiport serial card.
To compile this driver as a module, choose M here: the
module will be called moxa.
config MOXA_SMARTIO
tristate "Moxa SmartIO support"
depends on SERIAL_NONSTANDARD
help
Say Y here if you have a Moxa SmartIO multiport serial card.
This driver can also be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called mxser. If you want to do that, say M
here.
config ISI
tristate "Multi-Tech multiport card support (EXPERIMENTAL)"
depends on SERIAL_NONSTANDARD
help
This is a driver for the Multi-Tech cards which provide several
serial ports. The driver is experimental and can currently only be
built as a module. The module will be called isicom.
If you want to do that, choose M here.
config SYNCLINK
tristate "Microgate SyncLink card support"
depends on SERIAL_NONSTANDARD && PCI && ISA_DMA_API
help
Provides support for the SyncLink ISA and PCI multiprotocol serial
adapters. These adapters support asynchronous and HDLC bit
synchronous communication up to 10Mbps (PCI adapter).
This driver can only be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called synclink. If you want to do that, say M
here.
config SYNCLINKMP
tristate "SyncLink Multiport support"
depends on SERIAL_NONSTANDARD
help
Enable support for the SyncLink Multiport (2 or 4 ports)
serial adapter, running asynchronous and HDLC communications up
to 2.048Mbps. Each ports is independently selectable for
RS-232, V.35, RS-449, RS-530, and X.21
This driver may be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called synclinkmp. If you want to do that, say M
here.
config SYNCLINK_GT
tristate "SyncLink GT/AC support"
depends on SERIAL_NONSTANDARD
help
Support for SyncLink GT and SyncLink AC families of
synchronous and asynchronous serial adapters
manufactured by Microgate Systems, Ltd. (www.microgate.com)
config N_HDLC
tristate "HDLC line discipline support"
depends on SERIAL_NONSTANDARD
help
Allows synchronous HDLC communications with tty device drivers that
support synchronous HDLC such as the Microgate SyncLink adapter.
This driver can only be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called n_hdlc. If you want to do that, say M
here.
config RISCOM8
tristate "SDL RISCom/8 card support"
depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP
help
This is a driver for the SDL Communications RISCom/8 multiport card,
which gives you many serial ports. You would need something like
this to connect more than two modems to your Linux box, for instance
in order to become a dial-in server. If you have a card like that,
say Y here and read the file <file:Documentation/riscom8.txt>.
Also it's possible to say M here and compile this driver as kernel
loadable module; the module will be called riscom8.
config SPECIALIX
tristate "Specialix IO8+ card support"
depends on SERIAL_NONSTANDARD
help
This is a driver for the Specialix IO8+ multiport card (both the
ISA and the PCI version) which gives you many serial ports. You
would need something like this to connect more than two modems to
your Linux box, for instance in order to become a dial-in server.
If you have a card like that, say Y here and read the file
<file:Documentation/specialix.txt>. Also it's possible to say M here
and compile this driver as kernel loadable module which will be
called specialix.
config SPECIALIX_RTSCTS
bool "Specialix DTR/RTS pin is RTS"
depends on SPECIALIX
help
The Specialix IO8+ card can only support either RTS or DTR. If you
say N here, the driver will use the pin as "DTR" when the tty is in
software handshake mode. If you say Y here or hardware handshake is
on, it will always be RTS. Read the file
<file:Documentation/specialix.txt> for more information.
config SX
tristate "Specialix SX (and SI) card support"
depends on SERIAL_NONSTANDARD
help
This is a driver for the SX and SI multiport serial cards.
Please read the file <file:Documentation/sx.txt> for details.
This driver can only be built as a module ( = code which can be
inserted in and removed from the running kernel whenever you want).
The module will be called sx. If you want to do that, say M here.
config RIO
tristate "Specialix RIO system support"
depends on SERIAL_NONSTANDARD && BROKEN_ON_SMP && !64BIT
help
This is a driver for the Specialix RIO, a smart serial card which
drives an outboard box that can support up to 128 ports. Product
information is at <http://www.perle.com/support/documentation.html#multiport>.
There are both ISA and PCI versions.
config RIO_OLDPCI
bool "Support really old RIO/PCI cards"
depends on RIO
help
Older RIO PCI cards need some initialization-time configuration to
determine the IRQ and some control addresses. If you have a RIO and
this doesn't seem to work, try setting this to Y.
config STALDRV
bool "Stallion multiport serial support"
depends on SERIAL_NONSTANDARD
help
Stallion cards give you many serial ports. You would need something
like this to connect more than two modems to your Linux box, for
instance in order to become a dial-in server. If you say Y here,
you will be asked for your specific card model in the next
questions. Make sure to read <file:Documentation/stallion.txt> in
this case. If you have never heard about all this, it's safe to
say N.
config STALLION
tristate "Stallion EasyIO or EC8/32 support"
depends on STALDRV && BROKEN_ON_SMP
help
If you have an EasyIO or EasyConnection 8/32 multiport Stallion
card, then this is for you; say Y. Make sure to read
<file:Documentation/stallion.txt>.
To compile this driver as a module, choose M here: the
module will be called stallion.
config ISTALLION
tristate "Stallion EC8/64, ONboard, Brumby support"
depends on STALDRV && BROKEN_ON_SMP
help
If you have an EasyConnection 8/64, ONboard, Brumby or Stallion
serial multiport card, say Y here. Make sure to read
<file:Documentation/stallion.txt>.
To compile this driver as a module, choose M here: the
module will be called istallion.
config AU1000_UART
bool "Enable Au1000 UART Support"
depends on SERIAL_NONSTANDARD && MIPS
help
If you have an Alchemy AU1000 processor (MIPS based) and you want
to use serial ports, say Y. Otherwise, say N.
config AU1000_SERIAL_CONSOLE
bool "Enable Au1000 serial console"
depends on AU1000_UART
help
If you have an Alchemy AU1000 processor (MIPS based) and you want
to use a console on a serial port, say Y. Otherwise, say N.
config QTRONIX_KEYBOARD
bool "Enable Qtronix 990P Keyboard Support"
depends on IT8712
help
Images of Qtronix keyboards are at
<http://www.qtronix.com/keyboard.html>.
config IT8172_CIR
bool
depends on QTRONIX_KEYBOARD
default y
config IT8172_SCR0
bool "Enable Smart Card Reader 0 Support "
depends on IT8712
help
Say Y here to support smart-card reader 0 (SCR0) on the Integrated
Technology Express, Inc. ITE8172 SBC. Vendor page at
<http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
board at <http://www.mvista.com/partners/semiconductor/ite.html>.
config IT8172_SCR1
bool "Enable Smart Card Reader 1 Support "
depends on IT8712
help
Say Y here to support smart-card reader 1 (SCR1) on the Integrated
Technology Express, Inc. ITE8172 SBC. Vendor page at
<http://www.ite.com.tw/ia/brief_it8172bsp.htm>; picture of the
board at <http://www.mvista.com/partners/semiconductor/ite.html>.
config A2232
tristate "Commodore A2232 serial support (EXPERIMENTAL)"
depends on EXPERIMENTAL && ZORRO && BROKEN_ON_SMP
---help---
This option supports the 2232 7-port serial card shipped with the
Amiga 2000 and other Zorro-bus machines, dating from 1989. At
a max of 19,200 bps, the ports are served by a 6551 ACIA UART chip
each, plus a 8520 CIA, and a master 6502 CPU and buffer as well. The
ports were connected with 8 pin DIN connectors on the card bracket,
for which 8 pin to DB25 adapters were supplied. The card also had
jumpers internally to toggle various pinning configurations.
This driver can be built as a module; but then "generic_serial"
will also be built as a module. This has to be loaded before
"ser_a2232". If you want to do this, answer M here.
config SGI_SNSC
bool "SGI Altix system controller communication support"
depends on (IA64_SGI_SN2 || IA64_GENERIC)
help
If you have an SGI Altix and you want to enable system
controller communication from user space (you want this!),
say Y. Otherwise, say N.
config SGI_TIOCX
bool "SGI TIO CX driver support"
depends on (IA64_SGI_SN2 || IA64_GENERIC)
help
If you have an SGI Altix and you have fpga devices attached
to your TIO, say Y here, otherwise say N.
config SGI_MBCS
tristate "SGI FPGA Core Services driver support"
depends on SGI_TIOCX
help
If you have an SGI Altix with an attached SABrick
say Y or M here, otherwise say N.
source "drivers/serial/Kconfig"
config UNIX98_PTYS
bool "Unix98 PTY support" if EMBEDDED
default y
---help---
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
read data from and write data to the slave, thereby emulating a
terminal. Typical programs for the master side are telnet servers
and xterms.
Linux has traditionally used the BSD-like names /dev/ptyxx for
masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
has a number of problems. The GNU C library glibc 2.1 and later,
however, supports the Unix98 naming standard: in order to acquire a
pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
terminal is then made available to the process and the pseudo
terminal slave can be accessed as /dev/pts/<number>. What was
traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
All modern Linux systems use the Unix98 ptys. Say Y unless
you're on an embedded system and want to conserve memory.
config LEGACY_PTYS
bool "Legacy (BSD) PTY support"
default y
---help---
A pseudo terminal (PTY) is a software device consisting of two
halves: a master and a slave. The slave device behaves identical to
a physical terminal; the master device is used by a process to
read data from and write data to the slave, thereby emulating a
terminal. Typical programs for the master side are telnet servers
and xterms.
Linux has traditionally used the BSD-like names /dev/ptyxx
for masters and /dev/ttyxx for slaves of pseudo
terminals. This scheme has a number of problems, including
security. This option enables these legacy devices; on most
systems, it is safe to say N.
config LEGACY_PTY_COUNT
int "Maximum number of legacy PTY in use"
depends on LEGACY_PTYS
range 1 256
default "256"
---help---
The maximum number of legacy PTYs that can be used at any one time.
The default is 256, and should be more than enough. Embedded
systems may want to reduce this to save memory.
When not in use, each legacy PTY occupies 12 bytes on 32-bit
architectures and 24 bytes on 64-bit architectures.
config PRINTER
tristate "Parallel printer support"
depends on PARPORT
---help---
If you intend to attach a printer to the parallel port of your Linux
box (as opposed to using a serial printer; if the connector at the
printer has 9 or 25 holes ["female"], then it's serial), say Y.
Also read the Printing-HOWTO, available from
<http://www.tldp.org/docs.html#howto>.
It is possible to share one parallel port among several devices
(e.g. printer and ZIP drive) and it is safe to compile the
corresponding drivers into the kernel.
To compile this driver as a module, choose M here and read
<file:Documentation/parport.txt>. The module will be called lp.
If you have several parallel ports, you can specify which ports to
use with the "lp" kernel command line option. (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.) The syntax of the
"lp" command line option can be found in <file:drivers/char/lp.c>.
If you have more than 8 printers, you need to increase the LP_NO
macro in lp.c and the PARPORT_MAX macro in parport.h.
config LP_CONSOLE
bool "Support for console on line printer"
depends on PRINTER
---help---
If you want kernel messages to be printed out as they occur, you
can have a console on the printer. This option adds support for
doing that; to actually get it to happen you need to pass the
option "console=lp0" to the kernel at boot time.
If the printer is out of paper (or off, or unplugged, or too
busy..) the kernel will stall until the printer is ready again.
By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
can make the kernel continue when this happens,
but it'll lose the kernel messages.
If unsure, say N.
config PPDEV
tristate "Support for user-space parallel port device drivers"
depends on PARPORT
---help---
Saying Y to this adds support for /dev/parport device nodes. This
is needed for programs that want portable access to the parallel
port, for instance deviceid (which displays Plug-and-Play device
IDs).
This is the parallel port equivalent of SCSI generic support (sg).
It is safe to say N to this -- it is not needed for normal printing
or parallel port CD-ROM/disk support.
To compile this driver as a module, choose M here: the
module will be called ppdev.
If unsure, say N.
config TIPAR
tristate "Texas Instruments parallel link cable support"
depends on PARPORT
---help---
If you own a Texas Instruments graphing calculator and use a
parallel link cable, then you might be interested in this driver.
If you enable this driver, you will be able to communicate with
your calculator through a set of device nodes under /dev. The
main advantage of this driver is that you don't have to be root
to use this precise link cable (depending on the permissions on
the device nodes, though).
To compile this driver as a module, choose M here: the
module will be called tipar.
If you don't know what a parallel link cable is or what a Texas
Instruments graphing calculator is, then you probably don't need this
driver.
If unsure, say N.
config HVC_CONSOLE
bool "pSeries Hypervisor Virtual Console support"
depends on PPC_PSERIES
help
pSeries machines when partitioned support a hypervisor virtual
console. This driver allows each pSeries partition to have a console
which is accessed via the HMC.
config HVCS
tristate "IBM Hypervisor Virtual Console Server support"
depends on PPC_PSERIES
help
Partitionable IBM Power5 ppc64 machines allow hosting of
firmware virtual consoles from one Linux partition by
another Linux partition. This driver allows console data
from Linux partitions to be accessed through TTY device
interfaces in the device tree of a Linux partition running
this driver.
To compile this driver as a module, choose M here: the
module will be called hvcs.ko. Additionally, this module
will depend on arch specific APIs exported from hvcserver.ko
which will also be compiled when this driver is built as a
module.
source "drivers/char/ipmi/Kconfig"
source "drivers/char/watchdog/Kconfig"
config DS1620
tristate "NetWinder thermometer support"
depends on ARCH_NETWINDER
help
Say Y here to include support for the thermal management hardware
found in the NetWinder. This driver allows the user to control the
temperature set points and to read the current temperature.
It is also possible to say M here to build it as a module (ds1620)
It is recommended to be used on a NetWinder, but it is not a
necessity.
config NWBUTTON
tristate "NetWinder Button"
depends on ARCH_NETWINDER
---help---
If you say Y here and create a character device node /dev/nwbutton
with major and minor numbers 10 and 158 ("man mknod"), then every
time the orange button is pressed a number of times, the number of
times the button was pressed will be written to that device.
This is most useful for applications, as yet unwritten, which
perform actions based on how many times the button is pressed in a
row.
Do not hold the button down for too long, as the driver does not
alter the behaviour of the hardware reset circuitry attached to the
button; it will still execute a hard reset if the button is held
down for longer than approximately five seconds.
To compile this driver as a module, choose M here: the
module will be called nwbutton.
Most people will answer Y to this question and "Reboot Using Button"
below to be able to initiate a system shutdown from the button.
config NWBUTTON_REBOOT
bool "Reboot Using Button"
depends on NWBUTTON
help
If you say Y here, then you will be able to initiate a system
shutdown and reboot by pressing the orange button a number of times.
The number of presses to initiate the shutdown is two by default,
but this can be altered by modifying the value of NUM_PRESSES_REBOOT
in nwbutton.h and recompiling the driver or, if you compile the
driver as a module, you can specify the number of presses at load
time with "insmod button reboot_count=<something>".
config NWFLASH
tristate "NetWinder flash support"
depends on ARCH_NETWINDER
---help---
If you say Y here and create a character device /dev/flash with
major 10 and minor 160 you can manipulate the flash ROM containing
the NetWinder firmware. Be careful as accidentally overwriting the
flash contents can render your computer unbootable. On no account
allow random users access to this device. :-)
To compile this driver as a module, choose M here: the
module will be called nwflash.
If you're not sure, say N.
config HW_RANDOM
tristate "Intel/AMD/VIA HW Random Number Generator support"
depends on (X86 || IA64) && PCI
---help---
This driver provides kernel-side support for the Random Number
Generator hardware found on Intel i8xx-based motherboards,
AMD 76x-based motherboards, and Via Nehemiah CPUs.
Provides a character driver, used to read() entropy data.
To compile this driver as a module, choose M here: the
module will be called hw_random.
If unsure, say N.
config NVRAM
tristate "/dev/nvram support"
depends on ATARI || X86 || ARM || GENERIC_NVRAM
---help---
If you say Y here and create a character special file /dev/nvram
with major number 10 and minor number 144 using mknod ("man mknod"),
you get read and write access to the extra bytes of non-volatile
memory in the real time clock (RTC), which is contained in every PC
and most Ataris. The actual number of bytes varies, depending on the
nvram in the system, but is usually 114 (128-14 for the RTC).
This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
on Ataris. /dev/nvram may be used to view settings there, or to
change them (with some utility). It could also be used to frequently
save a few bits of very important data that may not be lost over
power-off and for which writing to disk is too insecure. Note
however that most NVRAM space in a PC belongs to the BIOS and you
should NEVER idly tamper with it. See Ralf Brown's interrupt list
for a guide to the use of CMOS bytes by your BIOS.
On Atari machines, /dev/nvram is always configured and does not need
to be selected.
To compile this driver as a module, choose M here: the
module will be called nvram.
config RTC
tristate "Enhanced Real Time Clock Support"
depends on !PPC32 && !PARISC && !IA64 && !M68K && (!SPARC || PCI) && !FRV
---help---
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
Every PC has such a clock built in. It can be used to generate
signals from as low as 1Hz up to 8192Hz, and can also be used
as a 24 hour alarm. It reports status information via the file
/proc/driver/rtc and its behaviour is set by various ioctls on
/dev/rtc.
If you run Linux on a multiprocessor machine and said Y to
"Symmetric Multi Processing" above, you should say Y here to read
and set the RTC in an SMP compatible fashion.
If you think you have a use for such a device (such as periodic data
sampling), then say Y here, and read <file:Documentation/rtc.txt>
for details.
To compile this driver as a module, choose M here: the
module will be called rtc.
config SGI_DS1286
tristate "SGI DS1286 RTC support"
depends on SGI_IP22
help
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock built into your computer.
Every SGI has such a clock built in. It reports status information
via the file /proc/rtc and its behaviour is set by various ioctls on
/dev/rtc.
config SGI_IP27_RTC
bool "SGI M48T35 RTC support"
depends on SGI_IP27
help
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock built into your computer.
Every SGI has such a clock built in. It reports status information
via the file /proc/rtc and its behaviour is set by various ioctls on
/dev/rtc.
config GEN_RTC
tristate "Generic /dev/rtc emulation"
depends on RTC!=y && !IA64 && !ARM && !M32R && !SPARC && !FRV
---help---
If you say Y here and create a character special file /dev/rtc with
major number 10 and minor number 135 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
It reports status information via the file /proc/driver/rtc and its
behaviour is set by various ioctls on /dev/rtc. If you enable the
"extended RTC operation" below it will also provide an emulation
for RTC_UIE which is required by some programs and may improve
precision in some cases.
To compile this driver as a module, choose M here: the
module will be called genrtc.
config GEN_RTC_X
bool "Extended RTC operation"
depends on GEN_RTC
help
Provides an emulation for RTC_UIE which is required by some programs
and may improve precision of the generic RTC support in some cases.
config EFI_RTC
bool "EFI Real Time Clock Services"
depends on IA64
config DS1302
tristate "DS1302 RTC support"
depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
help
If you say Y here and create a character special file /dev/rtc with
major number 121 and minor number 0 using mknod ("man mknod"), you
will get access to the real time clock (or hardware clock) built
into your computer.
config S3C2410_RTC
bool "S3C2410 RTC Driver"
depends on ARCH_S3C2410
help
RTC (Realtime Clock) driver for the clock inbuilt into the
Samsung S3C2410. This can provide periodic interrupt rates
from 1Hz to 64Hz for user programs, and wakeup from Alarm.
config RTC_VR41XX
tristate "NEC VR4100 series Real Time Clock Support"
depends on CPU_VR41XX
config COBALT_LCD
bool "Support for Cobalt LCD"
depends on MIPS_COBALT
help
This option enables support for the LCD display and buttons found
on Cobalt systems through a misc device.
config DTLK
tristate "Double Talk PC internal speech card support"
help
This driver is for the DoubleTalk PC, a speech synthesizer
manufactured by RC Systems (<http://www.rcsys.com/>). It is also
called the `internal DoubleTalk'.
To compile this driver as a module, choose M here: the
module will be called dtlk.
config R3964
tristate "Siemens R3964 line discipline"
---help---
This driver allows synchronous communication with devices using the
Siemens R3964 packet protocol. Unless you are dealing with special
hardware like PLCs, you are unlikely to need this.
To compile this driver as a module, choose M here: the
module will be called n_r3964.
If unsure, say N.
config APPLICOM
tristate "Applicom intelligent fieldbus card support"
depends on PCI
---help---
This driver provides the kernel-side support for the intelligent
fieldbus cards made by Applicom International. More information
about these cards can be found on the WWW at the address
<http://www.applicom-int.com/>, or by email from David Woodhouse
<dwmw2@infradead.org>.
To compile this driver as a module, choose M here: the
module will be called applicom.
If unsure, say N.
config SONYPI
tristate "Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)"
depends on EXPERIMENTAL && X86 && PCI && INPUT && !64BIT
---help---
This driver enables access to the Sony Programmable I/O Control
Device which can be found in many (all ?) Sony Vaio laptops.
If you have one of those laptops, read
<file:Documentation/sonypi.txt>, and say Y or M here.
To compile this driver as a module, choose M here: the
module will be called sonypi.
config TANBAC_TB0219
tristate "TANBAC TB0219 base board support"
depends TANBAC_TB022X
menu "Ftape, the floppy tape device driver"
config FTAPE
tristate "Ftape (QIC-80/Travan) support"
depends on BROKEN_ON_SMP && (ALPHA || X86)
---help---
If you have a tape drive that is connected to your floppy
controller, say Y here.
Some tape drives (like the Seagate "Tape Store 3200" or the Iomega
"Ditto 3200" or the Exabyte "Eagle TR-3") come with a "high speed"
controller of their own. These drives (and their companion
controllers) are also supported if you say Y here.
If you have a special controller (such as the CMS FC-10, FC-20,
Mountain Mach-II, or any controller that is based on the Intel 82078
FDC like the high speed controllers by Seagate and Exabyte and
Iomega's "Ditto Dash") you must configure it by selecting the
appropriate entries from the "Floppy tape controllers" sub-menu
below and possibly modify the default values for the IRQ and DMA
channel and the IO base in ftape's configuration menu.
If you want to use your floppy tape drive on a PCI-bus based system,
please read the file <file:drivers/char/ftape/README.PCI>.
The ftape kernel driver is also available as a runtime loadable
module. To compile this driver as a module, choose M here: the
module will be called ftape.
Note that the Ftape-HOWTO is out of date (sorry) and documents the
older version 2.08 of this software but still contains useful
information. There is a web page with more recent documentation at
<http://www.instmath.rwth-aachen.de/~heine/ftape/>. This page
always contains the latest release of the ftape driver and useful
information (backup software, ftape related patches and
documentation, FAQ). Note that the file system interface has
changed quite a bit compared to previous versions of ftape. Please
read <file:Documentation/ftape.txt>.
source "drivers/char/ftape/Kconfig"
endmenu
source "drivers/char/agp/Kconfig"
source "drivers/char/drm/Kconfig"
source "drivers/char/pcmcia/Kconfig"
config MWAVE
tristate "ACP Modem (Mwave) support"
depends on X86
select SERIAL_8250
---help---
The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
kernel driver and a user level application. Together these components
support direct attachment to public switched telephone networks (PSTNs)
and support selected world wide countries.
This version of the ACP Modem driver supports the IBM Thinkpad 600E,
600, and 770 that include on board ACP modem hardware.
The modem also supports the standard communications port interface
(ttySx) and is compatible with the Hayes AT Command Set.
The user level application needed to use this driver can be found at
the IBM Linux Technology Center (LTC) web site:
<http://www.ibm.com/linux/ltc/>.
If you own one of the above IBM Thinkpads which has the Mwave chipset
in it, say Y.
To compile this driver as a module, choose M here: the
module will be called mwave.
config SCx200_GPIO
tristate "NatSemi SCx200 GPIO Support"
depends on SCx200
help
Give userspace access to the GPIO pins on the National
Semiconductor SCx200 processors.
If compiled as a module, it will be called scx200_gpio.
config CS5535_GPIO
tristate "AMD CS5535/CS5536 GPIO (Geode Companion Device)"
depends on X86_32
help
Give userspace access to the GPIO pins on the AMD CS5535 and
CS5536 Geode companion devices.
If compiled as a module, it will be called cs5535_gpio.
config GPIO_VR41XX
tristate "NEC VR4100 series General-purpose I/O Unit support"
depends on CPU_VR41XX
config RAW_DRIVER
tristate "RAW driver (/dev/raw/rawN) (OBSOLETE)"
help
The raw driver permits block devices to be bound to /dev/raw/rawN.
Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
See the raw(8) manpage for more details.
The raw driver is deprecated and will be removed soon.
Applications should simply open the device (eg /dev/hda1)
with the O_DIRECT flag.
config MAX_RAW_DEVS
int "Maximum number of RAW devices to support (1-8192)"
depends on RAW_DRIVER
default "256"
help
The maximum number of RAW devices that are supported.
Default is 256. Increase this number in case you need lots of
raw devices.
config HPET
bool "HPET - High Precision Event Timer" if (X86 || IA64)
default n
depends on ACPI
help
If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
open selects one of the timers supported by the HPET. The timers are
non-periodioc and/or periodic.
config HPET_RTC_IRQ
bool "HPET Control RTC IRQ" if !HPET_EMULATE_RTC
default n
depends on HPET
help
If you say Y here, you will disable RTC_IRQ in drivers/char/rtc.c. It
is assumed the platform called hpet_alloc with the RTC IRQ values for
the HPET timers.
config HPET_MMAP
bool "Allow mmap of HPET"
default y
depends on HPET
help
If you say Y here, user applications will be able to mmap
the HPET registers.
In some hardware implementations, the page containing HPET
registers may also contain other things that shouldn't be
exposed to the user. If this applies to your hardware,
say N here.
config HANGCHECK_TIMER
tristate "Hangcheck timer"
depends on X86 || IA64 || PPC64 || S390
help
The hangcheck-timer module detects when the system has gone
out to lunch past a certain margin. It can reboot the system
or merely print a warning.
config MMTIMER
tristate "MMTIMER Memory mapped RTC for SGI Altix"
depends on IA64_GENERIC || IA64_SGI_SN2
default y
help
The mmtimer device allows direct userspace access to the
Altix system timer.
source "drivers/char/tpm/Kconfig"
config TELCLOCK
tristate "Telecom clock driver for MPBL0010 ATCA SBC"
depends on EXPERIMENTAL
default n
help
The telecom clock device is specific to the MPBL0010 ATCA computer and
allows direct userspace access to the configuration of the telecom clock
configuration settings. This device is used for hardware synchronization
across the ATCA backplane fabric. Upon loading, the driver exports a
sysfs directory, /sys/devices/platform/telco_clock, with a number of
files for controlling the behavior of this hardware.
endmenu
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