4f73bc4dd3
The option allows you to remove TTY and compile without errors. This saves space on systems that won't support TTY interfaces anyway. bloat-o-meter output is below. The bulk of this patch consists of Kconfig changes adding "depends on TTY" to various serial devices and similar drivers that require the TTY layer. Ideally, these dependencies would occur on a common intermediate symbol such as SERIO, but most drivers "select SERIO" rather than "depends on SERIO", and "select" does not respect dependencies. bloat-o-meter output comparing our previous minimal to new minimal by removing TTY. The list is filtered to not show removed entries with awk '$3 != "-"' as the list was very long. add/remove: 0/226 grow/shrink: 2/14 up/down: 6/-35356 (-35350) function old new delta chr_dev_init 166 170 +4 allow_signal 80 82 +2 static.__warned 143 142 -1 disallow_signal 63 62 -1 __set_special_pids 95 94 -1 unregister_console 126 121 -5 start_kernel 546 541 -5 register_console 593 588 -5 copy_from_user 45 40 -5 sys_setsid 128 120 -8 sys_vhangup 32 19 -13 do_exit 1543 1526 -17 bitmap_zero 60 40 -20 arch_local_irq_save 137 117 -20 release_task 674 652 -22 static.spin_unlock_irqrestore 308 260 -48 Signed-off-by: Joe Millenbach <jmillenbach@gmail.com> Reviewed-by: Jamey Sharp <jamey@minilop.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
609 lines
21 KiB
Text
609 lines
21 KiB
Text
#
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# Character device configuration
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#
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menu "Character devices"
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source "drivers/tty/Kconfig"
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config DEVKMEM
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bool "/dev/kmem virtual device support"
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default y
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help
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Say Y here if you want to support the /dev/kmem device. The
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/dev/kmem device is rarely used, but can be used for certain
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kind of kernel debugging operations.
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When in doubt, say "N".
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config STALDRV
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bool "Stallion multiport serial support"
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depends on SERIAL_NONSTANDARD
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help
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Stallion cards give you many serial ports. You would need something
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like this to connect more than two modems to your Linux box, for
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instance in order to become a dial-in server. If you say Y here,
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you will be asked for your specific card model in the next
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questions. Make sure to read <file:Documentation/serial/stallion.txt>
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in this case. If you have never heard about all this, it's safe to
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say N.
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config SGI_SNSC
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bool "SGI Altix system controller communication support"
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depends on (IA64_SGI_SN2 || IA64_GENERIC)
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help
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If you have an SGI Altix and you want to enable system
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controller communication from user space (you want this!),
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say Y. Otherwise, say N.
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config SGI_TIOCX
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bool "SGI TIO CX driver support"
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depends on (IA64_SGI_SN2 || IA64_GENERIC)
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help
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If you have an SGI Altix and you have fpga devices attached
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to your TIO, say Y here, otherwise say N.
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config SGI_MBCS
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tristate "SGI FPGA Core Services driver support"
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depends on SGI_TIOCX
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help
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If you have an SGI Altix with an attached SABrick
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say Y or M here, otherwise say N.
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source "drivers/tty/serial/Kconfig"
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config TTY_PRINTK
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bool "TTY driver to output user messages via printk"
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depends on EXPERT && TTY
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default n
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---help---
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If you say Y here, the support for writing user messages (i.e.
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console messages) via printk is available.
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The feature is useful to inline user messages with kernel
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messages.
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In order to use this feature, you should output user messages
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to /dev/ttyprintk or redirect console to this TTY.
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If unsure, say N.
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config BFIN_OTP
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tristate "Blackfin On-Chip OTP Memory Support"
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depends on BLACKFIN && (BF51x || BF52x || BF54x)
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default y
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help
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If you say Y here, you will get support for a character device
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interface into the One Time Programmable memory pages that are
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stored on the Blackfin processor. This will not get you access
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to the secure memory pages however. You will need to write your
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own secure code and reader for that.
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To compile this driver as a module, choose M here: the module
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will be called bfin-otp.
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If unsure, it is safe to say Y.
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config BFIN_OTP_WRITE_ENABLE
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bool "Enable writing support of OTP pages"
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depends on BFIN_OTP
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default n
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help
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If you say Y here, you will enable support for writing of the
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OTP pages. This is dangerous by nature as you can only program
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the pages once, so only enable this option when you actually
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need it so as to not inadvertently clobber data.
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If unsure, say N.
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config PRINTER
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tristate "Parallel printer support"
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depends on PARPORT
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---help---
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If you intend to attach a printer to the parallel port of your Linux
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box (as opposed to using a serial printer; if the connector at the
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printer has 9 or 25 holes ["female"], then it's serial), say Y.
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Also read the Printing-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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It is possible to share one parallel port among several devices
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(e.g. printer and ZIP drive) and it is safe to compile the
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corresponding drivers into the kernel.
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To compile this driver as a module, choose M here and read
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<file:Documentation/parport.txt>. The module will be called lp.
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If you have several parallel ports, you can specify which ports to
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use with the "lp" kernel command line option. (Try "man bootparam"
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or see the documentation of your boot loader (lilo or loadlin) about
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how to pass options to the kernel at boot time.) The syntax of the
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"lp" command line option can be found in <file:drivers/char/lp.c>.
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If you have more than 8 printers, you need to increase the LP_NO
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macro in lp.c and the PARPORT_MAX macro in parport.h.
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config LP_CONSOLE
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bool "Support for console on line printer"
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depends on PRINTER
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---help---
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If you want kernel messages to be printed out as they occur, you
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can have a console on the printer. This option adds support for
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doing that; to actually get it to happen you need to pass the
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option "console=lp0" to the kernel at boot time.
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If the printer is out of paper (or off, or unplugged, or too
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busy..) the kernel will stall until the printer is ready again.
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By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
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can make the kernel continue when this happens,
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but it'll lose the kernel messages.
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If unsure, say N.
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config PPDEV
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tristate "Support for user-space parallel port device drivers"
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depends on PARPORT
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---help---
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Saying Y to this adds support for /dev/parport device nodes. This
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is needed for programs that want portable access to the parallel
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port, for instance deviceid (which displays Plug-and-Play device
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IDs).
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This is the parallel port equivalent of SCSI generic support (sg).
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It is safe to say N to this -- it is not needed for normal printing
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or parallel port CD-ROM/disk support.
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To compile this driver as a module, choose M here: the
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module will be called ppdev.
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If unsure, say N.
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source "drivers/tty/hvc/Kconfig"
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config VIRTIO_CONSOLE
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tristate "Virtio console"
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depends on VIRTIO && TTY
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select HVC_DRIVER
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help
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Virtio console for use with lguest and other hypervisors.
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Also serves as a general-purpose serial device for data
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transfer between the guest and host. Character devices at
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/dev/vportNpn will be created when corresponding ports are
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found, where N is the device number and n is the port number
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within that device. If specified by the host, a sysfs
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attribute called 'name' will be populated with a name for
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the port which can be used by udev scripts to create a
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symlink to the device.
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config IBM_BSR
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tristate "IBM POWER Barrier Synchronization Register support"
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depends on PPC_PSERIES
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help
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This devices exposes a hardware mechanism for fast synchronization
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of threads across a large system which avoids bouncing a cacheline
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between several cores on a system
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source "drivers/char/ipmi/Kconfig"
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config DS1620
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tristate "NetWinder thermometer support"
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depends on ARCH_NETWINDER
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help
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Say Y here to include support for the thermal management hardware
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found in the NetWinder. This driver allows the user to control the
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temperature set points and to read the current temperature.
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It is also possible to say M here to build it as a module (ds1620)
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It is recommended to be used on a NetWinder, but it is not a
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necessity.
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config NWBUTTON
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tristate "NetWinder Button"
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depends on ARCH_NETWINDER
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---help---
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If you say Y here and create a character device node /dev/nwbutton
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with major and minor numbers 10 and 158 ("man mknod"), then every
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time the orange button is pressed a number of times, the number of
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times the button was pressed will be written to that device.
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This is most useful for applications, as yet unwritten, which
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perform actions based on how many times the button is pressed in a
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row.
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Do not hold the button down for too long, as the driver does not
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alter the behaviour of the hardware reset circuitry attached to the
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button; it will still execute a hard reset if the button is held
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down for longer than approximately five seconds.
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To compile this driver as a module, choose M here: the
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module will be called nwbutton.
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Most people will answer Y to this question and "Reboot Using Button"
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below to be able to initiate a system shutdown from the button.
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config NWBUTTON_REBOOT
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bool "Reboot Using Button"
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depends on NWBUTTON
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help
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If you say Y here, then you will be able to initiate a system
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shutdown and reboot by pressing the orange button a number of times.
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The number of presses to initiate the shutdown is two by default,
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but this can be altered by modifying the value of NUM_PRESSES_REBOOT
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in nwbutton.h and recompiling the driver or, if you compile the
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driver as a module, you can specify the number of presses at load
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time with "insmod button reboot_count=<something>".
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config NWFLASH
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tristate "NetWinder flash support"
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depends on ARCH_NETWINDER
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---help---
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If you say Y here and create a character device /dev/flash with
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major 10 and minor 160 you can manipulate the flash ROM containing
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the NetWinder firmware. Be careful as accidentally overwriting the
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flash contents can render your computer unbootable. On no account
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allow random users access to this device. :-)
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To compile this driver as a module, choose M here: the
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module will be called nwflash.
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If you're not sure, say N.
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source "drivers/char/hw_random/Kconfig"
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config NVRAM
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tristate "/dev/nvram support"
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depends on ATARI || X86 || (ARM && RTC_DRV_CMOS) || GENERIC_NVRAM
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---help---
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If you say Y here and create a character special file /dev/nvram
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with major number 10 and minor number 144 using mknod ("man mknod"),
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you get read and write access to the extra bytes of non-volatile
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memory in the real time clock (RTC), which is contained in every PC
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and most Ataris. The actual number of bytes varies, depending on the
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nvram in the system, but is usually 114 (128-14 for the RTC).
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This memory is conventionally called "CMOS RAM" on PCs and "NVRAM"
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on Ataris. /dev/nvram may be used to view settings there, or to
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change them (with some utility). It could also be used to frequently
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save a few bits of very important data that may not be lost over
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power-off and for which writing to disk is too insecure. Note
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however that most NVRAM space in a PC belongs to the BIOS and you
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should NEVER idly tamper with it. See Ralf Brown's interrupt list
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for a guide to the use of CMOS bytes by your BIOS.
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On Atari machines, /dev/nvram is always configured and does not need
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to be selected.
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To compile this driver as a module, choose M here: the
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module will be called nvram.
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#
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# These legacy RTC drivers just cause too many conflicts with the generic
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# RTC framework ... let's not even try to coexist any more.
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#
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if RTC_LIB=n
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config RTC
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tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)"
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depends on !PPC && !PARISC && !IA64 && !M68K && !SPARC && !FRV \
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&& !ARM && !SUPERH && !S390 && !AVR32 && !BLACKFIN && !UML
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---help---
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If you say Y here and create a character special file /dev/rtc with
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major number 10 and minor number 135 using mknod ("man mknod"), you
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will get access to the real time clock (or hardware clock) built
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into your computer.
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Every PC has such a clock built in. It can be used to generate
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signals from as low as 1Hz up to 8192Hz, and can also be used
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as a 24 hour alarm. It reports status information via the file
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/proc/driver/rtc and its behaviour is set by various ioctls on
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/dev/rtc.
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If you run Linux on a multiprocessor machine and said Y to
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"Symmetric Multi Processing" above, you should say Y here to read
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and set the RTC in an SMP compatible fashion.
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If you think you have a use for such a device (such as periodic data
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sampling), then say Y here, and read <file:Documentation/rtc.txt>
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for details.
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To compile this driver as a module, choose M here: the
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module will be called rtc.
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config JS_RTC
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tristate "Enhanced Real Time Clock Support"
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depends on SPARC32 && PCI
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---help---
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If you say Y here and create a character special file /dev/rtc with
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major number 10 and minor number 135 using mknod ("man mknod"), you
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will get access to the real time clock (or hardware clock) built
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into your computer.
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Every PC has such a clock built in. It can be used to generate
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signals from as low as 1Hz up to 8192Hz, and can also be used
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as a 24 hour alarm. It reports status information via the file
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/proc/driver/rtc and its behaviour is set by various ioctls on
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/dev/rtc.
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If you think you have a use for such a device (such as periodic data
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sampling), then say Y here, and read <file:Documentation/rtc.txt>
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for details.
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To compile this driver as a module, choose M here: the
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module will be called js-rtc.
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config GEN_RTC
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tristate "Generic /dev/rtc emulation"
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depends on RTC!=y && !IA64 && !ARM && !M32R && !MIPS && !SPARC && !FRV && !S390 && !SUPERH && !AVR32 && !BLACKFIN && !UML
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---help---
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If you say Y here and create a character special file /dev/rtc with
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major number 10 and minor number 135 using mknod ("man mknod"), you
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will get access to the real time clock (or hardware clock) built
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into your computer.
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It reports status information via the file /proc/driver/rtc and its
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behaviour is set by various ioctls on /dev/rtc. If you enable the
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"extended RTC operation" below it will also provide an emulation
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for RTC_UIE which is required by some programs and may improve
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precision in some cases.
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To compile this driver as a module, choose M here: the
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module will be called genrtc.
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config GEN_RTC_X
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bool "Extended RTC operation"
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depends on GEN_RTC
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help
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Provides an emulation for RTC_UIE which is required by some programs
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and may improve precision of the generic RTC support in some cases.
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config EFI_RTC
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bool "EFI Real Time Clock Services"
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depends on IA64
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config DS1302
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tristate "DS1302 RTC support"
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depends on M32R && (PLAT_M32700UT || PLAT_OPSPUT)
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help
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If you say Y here and create a character special file /dev/rtc with
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major number 121 and minor number 0 using mknod ("man mknod"), you
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will get access to the real time clock (or hardware clock) built
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into your computer.
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endif # RTC_LIB
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config DTLK
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tristate "Double Talk PC internal speech card support"
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depends on ISA
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help
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This driver is for the DoubleTalk PC, a speech synthesizer
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manufactured by RC Systems (<http://www.rcsys.com/>). It is also
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called the `internal DoubleTalk'.
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To compile this driver as a module, choose M here: the
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module will be called dtlk.
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config XILINX_HWICAP
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tristate "Xilinx HWICAP Support"
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depends on XILINX_VIRTEX || MICROBLAZE
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help
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This option enables support for Xilinx Internal Configuration
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Access Port (ICAP) driver. The ICAP is used on Xilinx Virtex
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FPGA platforms to partially reconfigure the FPGA at runtime.
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If unsure, say N.
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config R3964
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tristate "Siemens R3964 line discipline"
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depends on TTY
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---help---
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This driver allows synchronous communication with devices using the
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Siemens R3964 packet protocol. Unless you are dealing with special
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hardware like PLCs, you are unlikely to need this.
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To compile this driver as a module, choose M here: the
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module will be called n_r3964.
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If unsure, say N.
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config APPLICOM
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tristate "Applicom intelligent fieldbus card support"
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depends on PCI
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---help---
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This driver provides the kernel-side support for the intelligent
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fieldbus cards made by Applicom International. More information
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about these cards can be found on the WWW at the address
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<http://www.applicom-int.com/>, or by email from David Woodhouse
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<dwmw2@infradead.org>.
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To compile this driver as a module, choose M here: the
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module will be called applicom.
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If unsure, say N.
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config SONYPI
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tristate "Sony Vaio Programmable I/O Control Device support"
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depends on X86 && PCI && INPUT && !64BIT
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---help---
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This driver enables access to the Sony Programmable I/O Control
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Device which can be found in many (all ?) Sony Vaio laptops.
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If you have one of those laptops, read
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<file:Documentation/laptops/sonypi.txt>, and say Y or M here.
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To compile this driver as a module, choose M here: the
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module will be called sonypi.
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config GPIO_TB0219
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tristate "TANBAC TB0219 GPIO support"
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depends on TANBAC_TB022X
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select GPIO_VR41XX
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source "drivers/char/pcmcia/Kconfig"
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config MWAVE
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tristate "ACP Modem (Mwave) support"
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depends on X86 && TTY
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select SERIAL_8250
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---help---
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The ACP modem (Mwave) for Linux is a WinModem. It is composed of a
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kernel driver and a user level application. Together these components
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support direct attachment to public switched telephone networks (PSTNs)
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and support selected world wide countries.
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This version of the ACP Modem driver supports the IBM Thinkpad 600E,
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600, and 770 that include on board ACP modem hardware.
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The modem also supports the standard communications port interface
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(ttySx) and is compatible with the Hayes AT Command Set.
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The user level application needed to use this driver can be found at
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the IBM Linux Technology Center (LTC) web site:
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<http://www.ibm.com/linux/ltc/>.
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If you own one of the above IBM Thinkpads which has the Mwave chipset
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in it, say Y.
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To compile this driver as a module, choose M here: the
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module will be called mwave.
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config SCx200_GPIO
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tristate "NatSemi SCx200 GPIO Support"
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depends on SCx200
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select NSC_GPIO
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help
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Give userspace access to the GPIO pins on the National
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Semiconductor SCx200 processors.
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If compiled as a module, it will be called scx200_gpio.
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config PC8736x_GPIO
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tristate "NatSemi PC8736x GPIO Support"
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depends on X86_32 && !UML
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default SCx200_GPIO # mostly N
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select NSC_GPIO # needed for support routines
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help
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Give userspace access to the GPIO pins on the National
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Semiconductor PC-8736x (x=[03456]) SuperIO chip. The chip
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has multiple functional units, inc several managed by
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hwmon/pc87360 driver. Tested with PC-87366
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If compiled as a module, it will be called pc8736x_gpio.
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config NSC_GPIO
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tristate "NatSemi Base GPIO Support"
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depends on X86_32
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# selected by SCx200_GPIO and PC8736x_GPIO
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# what about 2 selectors differing: m != y
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help
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Common support used (and needed) by scx200_gpio and
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pc8736x_gpio drivers. If those drivers are built as
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modules, this one will be too, named nsc_gpio
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config RAW_DRIVER
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tristate "RAW driver (/dev/raw/rawN)"
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depends on BLOCK
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help
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The raw driver permits block devices to be bound to /dev/raw/rawN.
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Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
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See the raw(8) manpage for more details.
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Applications should preferably open the device (eg /dev/hda1)
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with the O_DIRECT flag.
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config MAX_RAW_DEVS
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int "Maximum number of RAW devices to support (1-65536)"
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depends on RAW_DRIVER
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default "256"
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help
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The maximum number of RAW devices that are supported.
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Default is 256. Increase this number in case you need lots of
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raw devices.
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config HPET
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bool "HPET - High Precision Event Timer" if (X86 || IA64)
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default n
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depends on ACPI
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help
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If you say Y here, you will have a miscdevice named "/dev/hpet/". Each
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open selects one of the timers supported by the HPET. The timers are
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non-periodic and/or periodic.
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config HPET_MMAP
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bool "Allow mmap of HPET"
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default y
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depends on HPET
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help
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If you say Y here, user applications will be able to mmap
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the HPET registers.
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In some hardware implementations, the page containing HPET
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registers may also contain other things that shouldn't be
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exposed to the user. If this applies to your hardware,
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say N here.
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config HANGCHECK_TIMER
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tristate "Hangcheck timer"
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depends on X86 || IA64 || PPC64 || S390
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help
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The hangcheck-timer module detects when the system has gone
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out to lunch past a certain margin. It can reboot the system
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or merely print a warning.
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config MMTIMER
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tristate "MMTIMER Memory mapped RTC for SGI Altix"
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depends on IA64_GENERIC || IA64_SGI_SN2
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default y
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help
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The mmtimer device allows direct userspace access to the
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Altix system timer.
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config UV_MMTIMER
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tristate "UV_MMTIMER Memory mapped RTC for SGI UV"
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depends on X86_UV
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default m
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help
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The uv_mmtimer device allows direct userspace access to the
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UV system timer.
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source "drivers/char/tpm/Kconfig"
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config TELCLOCK
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tristate "Telecom clock driver for ATCA SBC"
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depends on X86
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default n
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help
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The telecom clock device is specific to the MPCBL0010 and MPCBL0050
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ATCA computers and allows direct userspace access to the
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configuration of the telecom clock configuration settings. This
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device is used for hardware synchronization across the ATCA backplane
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fabric. Upon loading, the driver exports a sysfs directory,
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/sys/devices/platform/telco_clock, with a number of files for
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controlling the behavior of this hardware.
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config DEVPORT
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bool
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depends on !M68K
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depends on ISA || PCI
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default y
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source "drivers/s390/char/Kconfig"
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config MSM_SMD_PKT
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bool "Enable device interface for some SMD packet ports"
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default n
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depends on MSM_SMD
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help
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Enables userspace clients to read and write to some packet SMD
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ports via device interface for MSM chipset.
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config TILE_SROM
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bool "Character-device access via hypervisor to the Tilera SPI ROM"
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depends on TILE
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default y
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---help---
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This device provides character-level read-write access
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to the SROM, typically via the "0", "1", and "2" devices
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in /dev/srom/. The Tilera hypervisor makes the flash
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device appear much like a simple EEPROM, and knows
|
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how to partition a single ROM for multiple purposes.
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endmenu
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