linux-stable/drivers/char/Kconfig

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License cleanup: add SPDX GPL-2.0 license identifier to files with no license Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 14:07:57 +00:00
# SPDX-License-Identifier: GPL-2.0
#
# Character device configuration
#
menu "Character devices"
source "drivers/tty/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 TTY_PRINTK_LEVEL
depends on TTY_PRINTK
int "ttyprintk log level (1-7)"
range 1 7
default "6"
help
Printk log level to use for ttyprintk messages.
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
<https://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/admin-guide/parport.rst>. The module will be called lp.
If you have several parallel ports, you can specify which ports to
use with the "lp" kernel command line option. (Try "man bootparam"
or see the documentation of your boot loader (lilo or loadlin) about
how to pass options to the kernel at boot time.) The syntax of the
"lp" command line option can be found in <file:drivers/char/lp.c>.
If you have more than 8 printers, you need to increase the LP_NO
macro in lp.c and the PARPORT_MAX macro in parport.h.
config LP_CONSOLE
bool "Support for console on line printer"
depends on PRINTER
help
If you want kernel messages to be printed out as they occur, you
can have a console on the printer. This option adds support for
doing that; to actually get it to happen you need to pass the
option "console=lp0" to the kernel at boot time.
If the printer is out of paper (or off, or unplugged, or too
busy..) the kernel will stall until the printer is ready again.
By defining CONSOLE_LP_STRICT to 0 (at your own risk) you
can make the kernel continue when this happens,
but it'll lose the kernel messages.
If unsure, say N.
config PPDEV
tristate "Support for user-space parallel port device drivers"
depends on PARPORT
help
Saying Y to this adds support for /dev/parport device nodes. This
is needed for programs that want portable access to the parallel
port, for instance deviceid (which displays Plug-and-Play device
IDs).
This is the parallel port equivalent of SCSI generic support (sg).
It is safe to say N to this -- it is not needed for normal printing
or parallel port CD-ROM/disk support.
To compile this driver as a module, choose M here: the
module will be called ppdev.
If unsure, say N.
config VIRTIO_CONSOLE
tristate "Virtio console"
depends on TTY
select HVC_DRIVER
select VIRTIO
help
Virtio console for use with 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
config POWERNV_OP_PANEL
tristate "IBM POWERNV Operator Panel Display support"
depends on PPC_POWERNV
default m
help
If you say Y here, a special character device node, /dev/op_panel,
will be created which exposes the operator panel display on IBM
Power Systems machines with FSPs.
If you don't require access to the operator panel display from user
space, say N.
If unsure, say M here to build it as a module called powernv-op-panel.
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 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 (<https://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 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 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
<https://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/admin-guide/laptops/sonypi.rst>, 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 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 NVRAM
tristate "/dev/nvram support"
depends on X86 || HAVE_ARCH_NVRAM_OPS
default M68K || PPC
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 non-volatile memory.
/dev/nvram may be used to view settings in NVRAM 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.
This memory is conventionally called "NVRAM" on PowerPC machines,
"CMOS RAM" on PCs, "NVRAM" on Ataris and "PRAM" on Macintoshes.
To compile this driver as a module, choose M here: the
module will be called nvram.
config DEVPORT
bool "/dev/port character device"
depends on ISA || PCI
default y
help
Say Y here if you want to support the /dev/port device. The /dev/port
device is similar to /dev/mem, but for I/O ports.
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 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.
source "drivers/s390/char/Kconfig"
source "drivers/char/xillybus/Kconfig"
config ADI
tristate "SPARC Privileged ADI driver"
depends on SPARC64
default m
help
SPARC M7 and newer processors utilize ADI (Application Data
Integrity) to version and protect memory. This driver provides
read/write access to the ADI versions for privileged processes.
This feature is also known as MCD (Memory Corruption Detection)
and SSM (Silicon Secured Memory). Intended consumers of this
driver include crash and makedumpfile.
config RANDOM_TRUST_CPU
bool "Trust the CPU manufacturer to initialize Linux's CRNG"
depends on ARCH_RANDOM
default n
help
Assume that CPU manufacturer (e.g., Intel or AMD for RDSEED or
RDRAND, IBM for the S390 and Power PC architectures) is trustworthy
for the purposes of initializing Linux's CRNG. Since this is not
something that can be independently audited, this amounts to trusting
that CPU manufacturer (perhaps with the insistence or mandate
of a Nation State's intelligence or law enforcement agencies)
has not installed a hidden back door to compromise the CPU's
random number generation facilities. This can also be configured
at boot with "random.trust_cpu=on/off".
config RANDOM_TRUST_BOOTLOADER
bool "Trust the bootloader to initialize Linux's CRNG"
help
Some bootloaders can provide entropy to increase the kernel's initial
device randomness. Say Y here to assume the entropy provided by the
booloader is trustworthy so it will be added to the kernel's entropy
pool. Otherwise, say N here so it will be regarded as device input that
only mixes the entropy pool. This can also be configured at boot with
"random.trust_bootloader=on/off".
endmenu