ARM: cpu topology: Add debugfs interface for cpu_power

[cmplus.git] / drivers / char / Kconfig

#
# Character device configuration
#

menu "Character devices"

source "drivers/tty/Kconfig"

config DEVMEM
        bool "Memory device driver"
        default y
        help
          The memory driver provides two character devices, mem and kmem, which
          provide access to the system's memory. The mem device is a view of
          physical memory, and each byte in the device corresponds to the
          matching physical address. The kmem device is the same as mem, but
          the addresses correspond to the kernel's virtual address space rather
          than physical memory. These devices are standard parts of a Linux
          system and most users should say Y here. You might say N if very
          security conscience or memory is tight.

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 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/serial/stallion.txt>
          in this case.  If you have never heard about all this, it's safe to
          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
        bool "TTY driver to output user messages via printk"
        depends on EXPERT
        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 BRIQ_PANEL
        tristate 'Total Impact briQ front panel driver'
        depends on PPC_CHRP
        ---help---
          The briQ is a small footprint CHRP computer with a frontpanel VFD, a
          tristate led and two switches. It is the size of a CDROM drive.

          If you have such one and want anything showing on the VFD then you
          must answer Y here.

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

          It's safe to say N here.

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
        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
        ---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
        ---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"
        ---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/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
        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
        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
        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.

          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.

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 EXPERIMENTAL && 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

config DCC_TTY
        tristate "DCC tty driver"
        depends on ARM

source "drivers/s390/char/Kconfig"

config RAMOOPS
        tristate "Log panic/oops to a RAM buffer"
        depends on HAS_IOMEM
        default n
        help
          This enables panic and oops messages to be logged to a circular
          buffer in RAM where it can be read back at some later point.

config MSM_SMD_PKT
        bool "Enable device interface for some SMD packet ports"
        default n
        depends on MSM_SMD
        help
          Enables userspace clients to read and write to some packet SMD
          ports via device interface for MSM chipset.

endmenu