drivers/char/Kconfig - linux - Git at Google


            
            #

            
            # Character device configuration

            
            #


            menu "Character devices"


            source "drivers/tty/Kconfig"


            config DEVMEM

            
            	bool "/dev/mem virtual device support"

            
            	default y

            
            	help

            
            	  Say Y here if you want to support the /dev/mem device.

            
            	  The /dev/mem device is used to access areas of physical

            
            	  memory.

            
            	  When in doubt, say "Y".


            config DEVKMEM

            
            	bool "/dev/kmem virtual device support"

            
            	default y

            
            	help

            
            	  Say Y here if you want to support the /dev/kmem device. The

            
            	  /dev/kmem device is rarely used, but can be used for certain

            
            	  kind of kernel debugging operations.

            
            	  When in doubt, say "N".


            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/tty/serial/Kconfig"


            config TTY_PRINTK

            
            	tristate "TTY driver to output user messages via printk"

            
            	depends on EXPERT && TTY

            
            	default n

            
            	---help---

            
            	  If you say Y here, the support for writing user messages (i.e.

            
            	  console messages) via printk is available.


            	  The feature is useful to inline user messages with kernel

            
            	  messages.

            
            	  In order to use this feature, you should output user messages

            
            	  to /dev/ttyprintk or redirect console to this TTY.


            	  If unsure, say N.


            config BFIN_OTP

            
            	tristate "Blackfin On-Chip OTP Memory Support"

            
            	depends on BLACKFIN && (BF51x || BF52x || BF54x)

            
            	default y

            
            	help

            
            	  If you say Y here, you will get support for a character device

            
            	  interface into the One Time Programmable memory pages that are

            
            	  stored on the Blackfin processor.  This will not get you access

            
            	  to the secure memory pages however.  You will need to write your

            
            	  own secure code and reader for that.


            	  To compile this driver as a module, choose M here: the module

            
            	  will be called bfin-otp.


            	  If unsure, it is safe to say Y.


            config BFIN_OTP_WRITE_ENABLE

            
            	bool "Enable writing support of OTP pages"

            
            	depends on BFIN_OTP

            
            	default n

            
            	help

            
            	  If you say Y here, you will enable support for writing of the

            
            	  OTP pages.  This is dangerous by nature as you can only program

            
            	  the pages once, so only enable this option when you actually

            
            	  need it so as to not inadvertently clobber data.


            	  If unsure, say N.


            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.


            source "drivers/tty/hvc/Kconfig"


            config VIRTIO_CONSOLE

            
            	tristate "Virtio console"

            
            	depends on VIRTIO && TTY

            
            	select HVC_DRIVER

            
            	help

            
            	  Virtio console for use with lguest and other hypervisors.


            	  Also serves as a general-purpose serial device for data

            
            	  transfer between the guest and host.  Character devices at

            
            	  /dev/vportNpn will be created when corresponding ports are

            
            	  found, where N is the device number and n is the port number

            
            	  within that device.  If specified by the host, a sysfs

            
            	  attribute called 'name' will be populated with a name for

            
            	  the port which can be used by udev scripts to create a

            
            	  symlink to the device.


            config IBM_BSR

            
            	tristate "IBM POWER Barrier Synchronization Register support"

            
            	depends on PPC_PSERIES

            
            	help

            
            	  This devices exposes a hardware mechanism for fast synchronization

            
            	  of threads across a large system which avoids bouncing a cacheline

            
            	  between several cores on a system


            source "drivers/char/ipmi/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.


            source "drivers/char/hw_random/Kconfig"


            config NVRAM

            
            	tristate "/dev/nvram support"

            
            	depends on ATARI || X86 || (ARM && RTC_DRV_CMOS) || 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.


            #

            
            # These legacy RTC drivers just cause too many conflicts with the generic

            
            # RTC framework ... let's not even try to coexist any more.

            
            #

            
            if RTC_LIB=n


            config RTC

            
            	tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"

            
            	depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV \

            
            			&& !ARM && !SUPERH && !S390 && !AVR32 && !BLACKFIN && !UML

            
            	---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 JS_RTC

            
            	tristate "Enhanced Real Time Clock Support"

            
            	depends on SPARC32 && PCI

            
            	---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 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 js-rtc.


            config GEN_RTC

            
            	tristate "Generic /dev/rtc emulation"

            
            	depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32 && !BLACKFIN && !UML

            
            	---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.


            endif # RTC_LIB


            config DTLK

            
            	tristate "Double Talk PC internal speech card support"

            
            	depends on ISA

            
            	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 XILINX_HWICAP

            
            	tristate "Xilinx HWICAP Support"

            
            	depends on XILINX_VIRTEX || MICROBLAZE

            
            	help

            
            	  This option enables support for Xilinx Internal Configuration

            
            	  Access Port (ICAP) driver.  The ICAP is used on Xilinx Virtex

            
            	  FPGA platforms to partially reconfigure the FPGA at runtime.


            	  If unsure, say N.


            config R3964

            
            	tristate "Siemens R3964 line discipline"

            
            	depends on TTY

            
            	---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"

            
            	depends on X86_32 && PCI && INPUT

            
            	---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/laptops/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 GPIO_TB0219

            
            	tristate "TANBAC TB0219 GPIO support"

            
            	depends on TANBAC_TB022X

            
            	select GPIO_VR41XX


            source "drivers/char/pcmcia/Kconfig"


            config MWAVE

            
            	tristate "ACP Modem (Mwave) support"

            
            	depends on X86 && TTY

            
            	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

            
            	select NSC_GPIO

            
            	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 PC8736x_GPIO

            
            	tristate "NatSemi PC8736x GPIO Support"

            
            	depends on X86_32 && !UML

            
            	default SCx200_GPIO	# mostly N

            
            	select NSC_GPIO		# needed for support routines

            
            	help

            
            	  Give userspace access to the GPIO pins on the National

            
            	  Semiconductor PC-8736x (x=[03456]) SuperIO chip.  The chip

            
            	  has multiple functional units, inc several managed by

            
            	  hwmon/pc87360 driver.  Tested with PC-87366


            	  If compiled as a module, it will be called pc8736x_gpio.


            config NSC_GPIO

            
            	tristate "NatSemi Base GPIO Support"

            
            	depends on X86_32

            
            	# selected by SCx200_GPIO and PC8736x_GPIO

            
            	# what about 2 selectors differing: m != y

            
            	help

            
            	  Common support used (and needed) by scx200_gpio and

            
            	  pc8736x_gpio drivers.  If those drivers are built as

            
            	  modules, this one will be too, named nsc_gpio


            config RAW_DRIVER

            
            	tristate "RAW driver (/dev/raw/rawN)"

            
            	depends on BLOCK

            
            	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.


                      Applications should preferably open the device (eg /dev/hda1)

            
                      with the O_DIRECT flag.


            config MAX_RAW_DEVS

            
            	int "Maximum number of RAW devices to support (1-65536)"

            
            	depends on RAW_DRIVER

            
            	range 1 65536

            
            	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-periodic and/or periodic.


            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.


            config HPET_MMAP_DEFAULT

            
            	bool "Enable HPET MMAP access by default"

            
            	default y

            
            	depends on HPET_MMAP

            
            	help

            
            	  In some hardware implementations, the page containing HPET

            
            	  registers may also contain other things that shouldn't be

            
            	  exposed to the user.  This option selects the default (if

            
            	  kernel parameter hpet_mmap is not set) user access to the

            
            	  registers for applications that require it.


            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.


            config UV_MMTIMER

            
            	tristate "UV_MMTIMER Memory mapped RTC for SGI UV"

            
            	depends on X86_UV

            
            	default m

            
            	help

            
            	  The uv_mmtimer device allows direct userspace access to the

            
            	  UV system timer.


            source "drivers/char/tpm/Kconfig"


            config TELCLOCK

            
            	tristate "Telecom clock driver for ATCA SBC"

            
            	depends on X86

            
            	default n

            
            	help

            
            	  The telecom clock device is specific to the MPCBL0010 and MPCBL0050

            
            	  ATCA computers 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.


            config DEVPORT

            
            	bool

            
            	depends on !M68K

            
            	depends on ISA || PCI

            
            	default y


            source "drivers/s390/char/Kconfig"


            config TILE_SROM

            
            	bool "Character-device access via hypervisor to the Tilera SPI ROM"

            
            	depends on TILE

            
            	default y

            
            	---help---

            
            	  This device provides character-level read-write access

            
            	  to the SROM, typically via the "0", "1", and "2" devices

            
            	  in /dev/srom/.  The Tilera hypervisor makes the flash

            
            	  device appear much like a simple EEPROM, and knows

            
            	  how to partition a single ROM for multiple purposes.


            source "drivers/char/xillybus/Kconfig"


            endmenu
	#
	# Character device configuration
	#

	menu "Character devices"

	source "drivers/tty/Kconfig"

	config DEVMEM
	bool "/dev/mem virtual device support"
	default y
	help
	Say Y here if you want to support the /dev/mem device.
	The /dev/mem device is used to access areas of physical
	memory.
	When in doubt, say "Y".

	config DEVKMEM
	bool "/dev/kmem virtual device support"
	default y
	help
	Say Y here if you want to support the /dev/kmem device. The
	/dev/kmem device is rarely used, but can be used for certain
	kind of kernel debugging operations.
	When in doubt, say "N".

	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/tty/serial/Kconfig"

	config TTY_PRINTK
	tristate "TTY driver to output user messages via printk"
	depends on EXPERT && TTY
	default n
	---help---
	If you say Y here, the support for writing user messages (i.e.
	console messages) via printk is available.

	The feature is useful to inline user messages with kernel
	messages.
	In order to use this feature, you should output user messages
	to /dev/ttyprintk or redirect console to this TTY.

	If unsure, say N.

	config BFIN_OTP
	tristate "Blackfin On-Chip OTP Memory Support"
	depends on BLACKFIN && (BF51x \|\| BF52x \|\| BF54x)
	default y
	help
	If you say Y here, you will get support for a character device
	interface into the One Time Programmable memory pages that are
	stored on the Blackfin processor. This will not get you access
	to the secure memory pages however. You will need to write your
	own secure code and reader for that.

	To compile this driver as a module, choose M here: the module
	will be called bfin-otp.

	If unsure, it is safe to say Y.

	config BFIN_OTP_WRITE_ENABLE
	bool "Enable writing support of OTP pages"
	depends on BFIN_OTP
	default n
	help
	If you say Y here, you will enable support for writing of the
	OTP pages. This is dangerous by nature as you can only program
	the pages once, so only enable this option when you actually
	need it so as to not inadvertently clobber data.

	If unsure, say N.

	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.

	source "drivers/tty/hvc/Kconfig"

	config VIRTIO_CONSOLE
	tristate "Virtio console"
	depends on VIRTIO && TTY
	select HVC_DRIVER
	help
	Virtio console for use with lguest and other hypervisors.

	Also serves as a general-purpose serial device for data
	transfer between the guest and host. Character devices at
	/dev/vportNpn will be created when corresponding ports are
	found, where N is the device number and n is the port number
	within that device. If specified by the host, a sysfs
	attribute called 'name' will be populated with a name for
	the port which can be used by udev scripts to create a
	symlink to the device.

	config IBM_BSR
	tristate "IBM POWER Barrier Synchronization Register support"
	depends on PPC_PSERIES
	help
	This devices exposes a hardware mechanism for fast synchronization
	of threads across a large system which avoids bouncing a cacheline
	between several cores on a system

	source "drivers/char/ipmi/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.

	source "drivers/char/hw_random/Kconfig"

	config NVRAM
	tristate "/dev/nvram support"
	depends on ATARI \|\| X86 \|\| (ARM && RTC_DRV_CMOS) \|\| 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.

	#
	# These legacy RTC drivers just cause too many conflicts with the generic
	# RTC framework ... let's not even try to coexist any more.
	#
	if RTC_LIB=n

	config RTC
	tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"
	depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV \
	&& !ARM && !SUPERH && !S390 && !AVR32 && !BLACKFIN && !UML
	---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 JS_RTC
	tristate "Enhanced Real Time Clock Support"
	depends on SPARC32 && PCI
	---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 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 js-rtc.

	config GEN_RTC
	tristate "Generic /dev/rtc emulation"
	depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32 && !BLACKFIN && !UML
	---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.

	endif # RTC_LIB

	config DTLK
	tristate "Double Talk PC internal speech card support"
	depends on ISA
	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 XILINX_HWICAP
	tristate "Xilinx HWICAP Support"
	depends on XILINX_VIRTEX \|\| MICROBLAZE
	help
	This option enables support for Xilinx Internal Configuration
	Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex
	FPGA platforms to partially reconfigure the FPGA at runtime.

	If unsure, say N.

	config R3964
	tristate "Siemens R3964 line discipline"
	depends on TTY
	---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"
	depends on X86_32 && PCI && INPUT
	---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/laptops/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 GPIO_TB0219
	tristate "TANBAC TB0219 GPIO support"
	depends on TANBAC_TB022X
	select GPIO_VR41XX

	source "drivers/char/pcmcia/Kconfig"

	config MWAVE
	tristate "ACP Modem (Mwave) support"
	depends on X86 && TTY
	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
	select NSC_GPIO
	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 PC8736x_GPIO
	tristate "NatSemi PC8736x GPIO Support"
	depends on X86_32 && !UML
	default SCx200_GPIO # mostly N
	select NSC_GPIO # needed for support routines
	help
	Give userspace access to the GPIO pins on the National
	Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
	has multiple functional units, inc several managed by
	hwmon/pc87360 driver. Tested with PC-87366

	If compiled as a module, it will be called pc8736x_gpio.

	config NSC_GPIO
	tristate "NatSemi Base GPIO Support"
	depends on X86_32
	# selected by SCx200_GPIO and PC8736x_GPIO
	# what about 2 selectors differing: m != y
	help
	Common support used (and needed) by scx200_gpio and
	pc8736x_gpio drivers. If those drivers are built as
	modules, this one will be too, named nsc_gpio

	config RAW_DRIVER
	tristate "RAW driver (/dev/raw/rawN)"
	depends on BLOCK
	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.

	Applications should preferably open the device (eg /dev/hda1)
	with the O_DIRECT flag.

	config MAX_RAW_DEVS
	int "Maximum number of RAW devices to support (1-65536)"
	depends on RAW_DRIVER
	range 1 65536
	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-periodic and/or periodic.

	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.

	config HPET_MMAP_DEFAULT
	bool "Enable HPET MMAP access by default"
	default y
	depends on HPET_MMAP
	help
	In some hardware implementations, the page containing HPET
	registers may also contain other things that shouldn't be
	exposed to the user. This option selects the default (if
	kernel parameter hpet_mmap is not set) user access to the
	registers for applications that require it.

	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.

	config UV_MMTIMER
	tristate "UV_MMTIMER Memory mapped RTC for SGI UV"
	depends on X86_UV
	default m
	help
	The uv_mmtimer device allows direct userspace access to the
	UV system timer.

	source "drivers/char/tpm/Kconfig"

	config TELCLOCK
	tristate "Telecom clock driver for ATCA SBC"
	depends on X86
	default n
	help
	The telecom clock device is specific to the MPCBL0010 and MPCBL0050
	ATCA computers 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.

	config DEVPORT
	bool
	depends on !M68K
	depends on ISA \|\| PCI
	default y

	source "drivers/s390/char/Kconfig"

	config TILE_SROM
	bool "Character-device access via hypervisor to the Tilera SPI ROM"
	depends on TILE
	default y
	---help---
	This device provides character-level read-write access
	to the SROM, typically via the "0", "1", and "2" devices
	in /dev/srom/. The Tilera hypervisor makes the flash
	device appear much like a simple EEPROM, and knows
	how to partition a single ROM for multiple purposes.

	source "drivers/char/xillybus/Kconfig"

	endmenu