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tty: reorganize tty & serial menus
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Move LDISC_AUTOLOAD ahead of the Serial drivers menu.

Move the Serial drivers menu ahead of the Non-standard serial port
support menu.

Move NOZOMI out of the SERIAL_NONSTANDARD area since it does not
depend on SERIAL_NONSTANDARD and it breaks the SERIAL_NONSTANDARD
menu list.

Alphabetize the remaining drivers (in tty/Kconfig) by their prompt strings.
[The drivers in tty/hvc/Kconfig and tty/serial/Kconfig have not
been alphabetized.]

Cc: Jiri Slaby <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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@rddunlap @gregkh
rddunlap authored and gregkh committed Mar 12, 2020
1 parent 00e3754 commit 2cca608
Showing 1 changed file with 86 additions and 87 deletions.
173 changes: 86 additions & 87 deletions drivers/tty/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,6 @@ config LEGACY_PTYS
security. This option enables these legacy devices; on most
systems, it is safe to say N.


config LEGACY_PTY_COUNT
int "Maximum number of legacy PTY in use"
depends on LEGACY_PTYS
Expand All @@ -151,6 +150,31 @@ config LEGACY_PTY_COUNT
When not in use, each legacy PTY occupies 12 bytes on 32-bit
architectures and 24 bytes on 64-bit architectures.

config LDISC_AUTOLOAD
bool "Automatically load TTY Line Disciplines"
default y
help
Historically the kernel has always automatically loaded any
line discipline that is in a kernel module when a user asks
for it to be loaded with the TIOCSETD ioctl, or through other
means. This is not always the best thing to do on systems
where you know you will not be using some of the more
"ancient" line disciplines, so prevent the kernel from doing
this unless the request is coming from a process with the
CAP_SYS_MODULE permissions.

Say 'Y' here if you trust your userspace users to do the right
thing, or if you have only provided the line disciplines that
you know you will be using, or if you wish to continue to use
the traditional method of on-demand loading of these modules
by any user.

This functionality can be changed at runtime with the
dev.tty.ldisc_autoload sysctl, this configuration option will
only set the default value of this functionality.

source "drivers/tty/serial/Kconfig"

config SERIAL_NONSTANDARD
bool "Non-standard serial port support"
depends on HAS_IOMEM
Expand Down Expand Up @@ -270,16 +294,6 @@ config SYNCLINK_GT
synchronous and asynchronous serial adapters
manufactured by Microgate Systems, Ltd. (www.microgate.com)

config NOZOMI
tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
depends on PCI
help
If you have a HSDPA driver Broadband Wireless Data Card -
Globe Trotter PCMCIA card, say Y here.

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

config ISI
tristate "Multi-Tech multiport card support"
depends on SERIAL_NONSTANDARD && PCI
Expand All @@ -302,43 +316,6 @@ config N_HDLC
The module will be called n_hdlc. If you want to do that, say M
here.

config N_GSM
tristate "GSM MUX line discipline support (EXPERIMENTAL)"
depends on NET
help
This line discipline provides support for the GSM MUX protocol and
presents the mux as a set of 61 individual tty devices.

config TRACE_ROUTER
tristate "Trace data router for MIPI P1149.7 cJTAG standard"
depends on TRACE_SINK
help
The trace router uses the Linux tty line discipline framework to
route trace data coming from a tty port (say UART for example) to
the trace sink line discipline driver and to another tty port (say
USB). This is part of a solution for the MIPI P1149.7, compact JTAG,
standard, which is for debugging mobile devices. The PTI driver in
drivers/misc/pti.c defines the majority of this MIPI solution.

You should select this driver if the target kernel is meant for
a mobile device containing a modem. Then you will need to select
"Trace data sink for MIPI P1149.7 cJTAG standard" line discipline
driver.

config TRACE_SINK
tristate "Trace data sink for MIPI P1149.7 cJTAG standard"
help
The trace sink uses the Linux line discipline framework to receive
trace data coming from the trace router line discipline driver
to a user-defined tty port target, like USB.
This is to provide a way to extract modem trace data on
devices that do not have a PTI HW module, or just need modem
trace data to come out of a different HW output port.
This is part of a solution for the P1149.7, compact JTAG, standard.

If you select this option, you need to select
"Trace data router for MIPI P1149.7 cJTAG standard".

config PPC_EPAPR_HV_BYTECHAN
bool "ePAPR hypervisor byte channel driver"
depends on PPC
Expand Down Expand Up @@ -374,20 +351,6 @@ config PPC_EARLY_DEBUG_EHV_BC_HANDLE
there simply will be no early console output. This is true also
if you don't boot under a hypervisor at all.

config NULL_TTY
tristate "NULL TTY driver"
help
Say Y here if you want a NULL TTY which simply discards messages.

This is useful to allow userspace applications which expect a console
device to work without modifications even when no console is
available or desired.

In order to use this driver, you should redirect the console to this
TTY, or boot the kernel with console=ttynull.

If unsure, say N.

config GOLDFISH_TTY
tristate "Goldfish TTY Driver"
depends on GOLDFISH
Expand All @@ -401,6 +364,23 @@ config GOLDFISH_TTY_EARLY_CONSOLE
default y if GOLDFISH_TTY=y
select SERIAL_EARLYCON

config N_GSM
tristate "GSM MUX line discipline support (EXPERIMENTAL)"
depends on NET
help
This line discipline provides support for the GSM MUX protocol and
presents the mux as a set of 61 individual tty devices.

config NOZOMI
tristate "HSDPA Broadband Wireless Data Card - Globe Trotter"
depends on PCI
help
If you have a HSDPA driver Broadband Wireless Data Card -
Globe Trotter PCMCIA card, say Y here.

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

config MIPS_EJTAG_FDC_TTY
bool "MIPS EJTAG Fast Debug Channel TTY"
depends on MIPS_CDMM
Expand Down Expand Up @@ -448,38 +428,57 @@ config MIPS_EJTAG_FDC_KGDB_CHAN
help
FDC channel number to use for KGDB.

config VCC
tristate "Sun Virtual Console Concentrator"
depends on SUN_LDOMS
config NULL_TTY
tristate "NULL TTY driver"
help
Support for Sun logical domain consoles.
Say Y here if you want a NULL TTY which simply discards messages.

config LDISC_AUTOLOAD
bool "Automatically load TTY Line Disciplines"
default y
This is useful to allow userspace applications which expect a console
device to work without modifications even when no console is
available or desired.

In order to use this driver, you should redirect the console to this
TTY, or boot the kernel with console=ttynull.

If unsure, say N.

config TRACE_ROUTER
tristate "Trace data router for MIPI P1149.7 cJTAG standard"
depends on TRACE_SINK
help
Historically the kernel has always automatically loaded any
line discipline that is in a kernel module when a user asks
for it to be loaded with the TIOCSETD ioctl, or through other
means. This is not always the best thing to do on systems
where you know you will not be using some of the more
"ancient" line disciplines, so prevent the kernel from doing
this unless the request is coming from a process with the
CAP_SYS_MODULE permissions.
The trace router uses the Linux tty line discipline framework to
route trace data coming from a tty port (say UART for example) to
the trace sink line discipline driver and to another tty port (say
USB). This is part of a solution for the MIPI P1149.7, compact JTAG,
standard, which is for debugging mobile devices. The PTI driver in
drivers/misc/pti.c defines the majority of this MIPI solution.

Say 'Y' here if you trust your userspace users to do the right
thing, or if you have only provided the line disciplines that
you know you will be using, or if you wish to continue to use
the traditional method of on-demand loading of these modules
by any user.
You should select this driver if the target kernel is meant for
a mobile device containing a modem. Then you will need to select
"Trace data sink for MIPI P1149.7 cJTAG standard" line discipline
driver.

This functionality can be changed at runtime with the
dev.tty.ldisc_autoload sysctl, this configuration option will
only set the default value of this functionality.
config TRACE_SINK
tristate "Trace data sink for MIPI P1149.7 cJTAG standard"
help
The trace sink uses the Linux line discipline framework to receive
trace data coming from the trace router line discipline driver
to a user-defined tty port target, like USB.
This is to provide a way to extract modem trace data on
devices that do not have a PTI HW module, or just need modem
trace data to come out of a different HW output port.
This is part of a solution for the P1149.7, compact JTAG, standard.

source "drivers/tty/hvc/Kconfig"
If you select this option, you need to select
"Trace data router for MIPI P1149.7 cJTAG standard".

source "drivers/tty/serial/Kconfig"
config VCC
tristate "Sun Virtual Console Concentrator"
depends on SUN_LDOMS
help
Support for Sun logical domain consoles.

source "drivers/tty/hvc/Kconfig"

endif # TTY

Expand Down

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