tty: fix up and plug in tty_ioctl kernel-doc
The ioctl helpers are well documented, except they are not plugged in the Documentation. So fix up the minor issues in the kernel-doc and plug it in. The minor issues include: * bad \t on every line (sphinx misinterprets the description otherwise) * missing colon after Return * superfluous \n after the comment * make some struct members and constants a hyperlink * and so on Perhaps better to use --word-diff if one wants to see the "real" changes. Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org> Link: https://lore.kernel.org/r/20230919085156.1578-9-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE)
Greg Kroah-Hartman
parent
5b4f9cf3cc
commit
3b1a696bb9
@ -36,6 +36,7 @@ In-detail description of the named TTY structures is in separate documents:
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tty_struct
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tty_ldisc
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tty_buffer
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tty_ioctl
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tty_internals
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Writing TTY Driver
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7
Documentation/driver-api/tty/tty_ioctl.rst
Normal file
7
Documentation/driver-api/tty/tty_ioctl.rst
Normal file
@ -0,0 +1,7 @@
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.. SPDX-License-Identifier: GPL-2.0
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=================
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TTY IOCTL Helpers
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=================
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.. kernel-doc:: drivers/tty/tty_ioctl.c
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@ -38,16 +38,13 @@
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#define TERMIOS_TERMIO BIT(2)
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#define TERMIOS_OLD BIT(3)
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/**
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* tty_chars_in_buffer - characters pending
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* @tty: terminal
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* tty_chars_in_buffer - characters pending
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* @tty: terminal
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*
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* Return the number of bytes of data in the device private
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* output queue. If no private method is supplied there is assumed
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* to be no queue on the device.
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* Returns: the number of bytes of data in the device private output queue. If
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* no private method is supplied there is assumed to be no queue on the device.
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*/
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unsigned int tty_chars_in_buffer(struct tty_struct *tty)
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{
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if (tty->ops->chars_in_buffer)
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@ -57,16 +54,15 @@ unsigned int tty_chars_in_buffer(struct tty_struct *tty)
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EXPORT_SYMBOL(tty_chars_in_buffer);
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/**
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* tty_write_room - write queue space
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* @tty: terminal
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* tty_write_room - write queue space
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* @tty: terminal
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*
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* Return the number of bytes that can be queued to this device
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* at the present time. The result should be treated as a guarantee
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* and the driver cannot offer a value it later shrinks by more than
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* the number of bytes written. If no method is provided 2K is always
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* returned and data may be lost as there will be no flow control.
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* Returns: the number of bytes that can be queued to this device at the present
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* time. The result should be treated as a guarantee and the driver cannot
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* offer a value it later shrinks by more than the number of bytes written. If
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* no method is provided, 2K is always returned and data may be lost as there
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* will be no flow control.
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*/
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unsigned int tty_write_room(struct tty_struct *tty)
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{
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if (tty->ops->write_room)
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@ -76,12 +72,12 @@ unsigned int tty_write_room(struct tty_struct *tty)
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EXPORT_SYMBOL(tty_write_room);
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/**
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* tty_driver_flush_buffer - discard internal buffer
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* @tty: terminal
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* tty_driver_flush_buffer - discard internal buffer
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* @tty: terminal
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*
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* Discard the internal output buffer for this device. If no method
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* is provided then either the buffer cannot be hardware flushed or
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* there is no buffer driver side.
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* Discard the internal output buffer for this device. If no method is provided,
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* then either the buffer cannot be hardware flushed or there is no buffer
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* driver side.
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*/
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void tty_driver_flush_buffer(struct tty_struct *tty)
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{
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@ -91,18 +87,17 @@ void tty_driver_flush_buffer(struct tty_struct *tty)
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EXPORT_SYMBOL(tty_driver_flush_buffer);
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/**
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* tty_unthrottle - flow control
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* @tty: terminal
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* tty_unthrottle - flow control
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* @tty: terminal
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*
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* Indicate that a tty may continue transmitting data down the stack.
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* Takes the termios rwsem to protect against parallel throttle/unthrottle
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* and also to ensure the driver can consistently reference its own
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* termios data at this point when implementing software flow control.
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* Indicate that a @tty may continue transmitting data down the stack. Takes
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* the &tty_struct->termios_rwsem to protect against parallel
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* throttle/unthrottle and also to ensure the driver can consistently reference
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* its own termios data at this point when implementing software flow control.
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*
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* Drivers should however remember that the stack can issue a throttle,
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* then change flow control method, then unthrottle.
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* Drivers should however remember that the stack can issue a throttle, then
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* change flow control method, then unthrottle.
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*/
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void tty_unthrottle(struct tty_struct *tty)
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{
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down_write(&tty->termios_rwsem);
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@ -115,16 +110,15 @@ void tty_unthrottle(struct tty_struct *tty)
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EXPORT_SYMBOL(tty_unthrottle);
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/**
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* tty_throttle_safe - flow control
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* @tty: terminal
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* tty_throttle_safe - flow control
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* @tty: terminal
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*
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* Indicate that a tty should stop transmitting data down the stack.
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* tty_throttle_safe will only attempt throttle if tty->flow_change is
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* TTY_THROTTLE_SAFE. Prevents an accidental throttle due to race
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* conditions when throttling is conditional on factors evaluated prior to
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* throttling.
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* Indicate that a @tty should stop transmitting data down the stack.
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* tty_throttle_safe() will only attempt throttle if @tty->flow_change is
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* %TTY_THROTTLE_SAFE. Prevents an accidental throttle due to race conditions
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* when throttling is conditional on factors evaluated prior to throttling.
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*
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* Returns true if tty is throttled (or was already throttled)
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* Returns: %true if @tty is throttled (or was already throttled)
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*/
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bool tty_throttle_safe(struct tty_struct *tty)
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{
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@ -146,15 +140,15 @@ bool tty_throttle_safe(struct tty_struct *tty)
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}
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/**
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* tty_unthrottle_safe - flow control
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* @tty: terminal
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* tty_unthrottle_safe - flow control
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* @tty: terminal
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*
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* Similar to tty_unthrottle() but will only attempt unthrottle
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* if tty->flow_change is TTY_UNTHROTTLE_SAFE. Prevents an accidental
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* unthrottle due to race conditions when unthrottling is conditional
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* on factors evaluated prior to unthrottling.
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* Similar to tty_unthrottle() but will only attempt unthrottle if
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* @tty->flow_change is %TTY_UNTHROTTLE_SAFE. Prevents an accidental unthrottle
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* due to race conditions when unthrottling is conditional on factors evaluated
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* prior to unthrottling.
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*
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* Returns true if tty is unthrottled (or was already unthrottled)
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* Returns: %true if @tty is unthrottled (or was already unthrottled)
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*/
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bool tty_unthrottle_safe(struct tty_struct *tty)
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{
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@ -176,14 +170,14 @@ bool tty_unthrottle_safe(struct tty_struct *tty)
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}
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/**
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* tty_wait_until_sent - wait for I/O to finish
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* @tty: tty we are waiting for
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* @timeout: how long we will wait
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* tty_wait_until_sent - wait for I/O to finish
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* @tty: tty we are waiting for
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* @timeout: how long we will wait
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*
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* Wait for characters pending in a tty driver to hit the wire, or
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* for a timeout to occur (eg due to flow control)
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* Wait for characters pending in a tty driver to hit the wire, or for a
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* timeout to occur (eg due to flow control).
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*
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* Locking: none
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* Locking: none
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*/
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void tty_wait_until_sent(struct tty_struct *tty, long timeout)
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@ -229,16 +223,15 @@ static void unset_locked_termios(struct tty_struct *tty, const struct ktermios *
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}
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/**
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* tty_termios_copy_hw - copy hardware settings
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* @new: New termios
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* @old: Old termios
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* tty_termios_copy_hw - copy hardware settings
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* @new: new termios
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* @old: old termios
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*
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* Propagate the hardware specific terminal setting bits from
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* the old termios structure to the new one. This is used in cases
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* where the hardware does not support reconfiguration or as a helper
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* in some cases where only minimal reconfiguration is supported
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* Propagate the hardware specific terminal setting bits from the @old termios
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* structure to the @new one. This is used in cases where the hardware does not
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* support reconfiguration or as a helper in some cases where only minimal
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* reconfiguration is supported.
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*/
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void tty_termios_copy_hw(struct ktermios *new, const struct ktermios *old)
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{
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/* The bits a dumb device handles in software. Smart devices need
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@ -251,14 +244,15 @@ void tty_termios_copy_hw(struct ktermios *new, const struct ktermios *old)
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EXPORT_SYMBOL(tty_termios_copy_hw);
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/**
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* tty_termios_hw_change - check for setting change
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* @a: termios
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* @b: termios to compare
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* tty_termios_hw_change - check for setting change
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* @a: termios
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* @b: termios to compare
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*
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* Check if any of the bits that affect a dumb device have changed
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* between the two termios structures, or a speed change is needed.
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* Check if any of the bits that affect a dumb device have changed between the
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* two termios structures, or a speed change is needed.
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*
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* Returns: %true if change is needed
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*/
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bool tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b)
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{
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if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
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@ -270,11 +264,10 @@ bool tty_termios_hw_change(const struct ktermios *a, const struct ktermios *b)
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EXPORT_SYMBOL(tty_termios_hw_change);
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/**
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* tty_get_char_size - get size of a character
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* @cflag: termios cflag value
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* tty_get_char_size - get size of a character
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* @cflag: termios cflag value
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*
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* Get the size (in bits) of a character depending on @cflag's %CSIZE
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* setting.
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* Returns: size (in bits) of a character depending on @cflag's %CSIZE setting
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*/
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unsigned char tty_get_char_size(unsigned int cflag)
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{
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@ -293,13 +286,14 @@ unsigned char tty_get_char_size(unsigned int cflag)
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EXPORT_SYMBOL_GPL(tty_get_char_size);
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/**
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* tty_get_frame_size - get size of a frame
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* @cflag: termios cflag value
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* tty_get_frame_size - get size of a frame
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* @cflag: termios cflag value
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*
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* Get the size (in bits) of a frame depending on @cflag's %CSIZE, %CSTOPB,
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* and %PARENB setting. The result is a sum of character size, start and
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* stop bits -- one bit each -- second stop bit (if set), and parity bit
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* (if set).
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* Get the size (in bits) of a frame depending on @cflag's %CSIZE, %CSTOPB, and
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* %PARENB setting. The result is a sum of character size, start and stop bits
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* -- one bit each -- second stop bit (if set), and parity bit (if set).
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*
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* Returns: size (in bits) of a frame depending on @cflag's setting.
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*/
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unsigned char tty_get_frame_size(unsigned int cflag)
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{
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@ -317,16 +311,15 @@ unsigned char tty_get_frame_size(unsigned int cflag)
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EXPORT_SYMBOL_GPL(tty_get_frame_size);
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/**
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* tty_set_termios - update termios values
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* @tty: tty to update
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* @new_termios: desired new value
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* tty_set_termios - update termios values
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* @tty: tty to update
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* @new_termios: desired new value
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*
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* Perform updates to the termios values set on this terminal.
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* A master pty's termios should never be set.
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* Perform updates to the termios values set on this @tty. A master pty's
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* termios should never be set.
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*
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* Locking: termios_rwsem
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* Locking: &tty_struct->termios_rwsem
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*/
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int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios)
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{
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struct ktermios old_termios;
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@ -439,18 +432,19 @@ __weak int kernel_termios_to_user_termios(struct termios __user *u,
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#endif /* TCGETS2 */
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/**
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* set_termios - set termios values for a tty
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* @tty: terminal device
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* @arg: user data
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* @opt: option information
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* set_termios - set termios values for a tty
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* @tty: terminal device
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* @arg: user data
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* @opt: option information
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*
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* Helper function to prepare termios data and run necessary other
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* functions before using tty_set_termios to do the actual changes.
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* Helper function to prepare termios data and run necessary other functions
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* before using tty_set_termios() to do the actual changes.
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*
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* Locking:
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* Called functions take ldisc and termios_rwsem locks
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* Locking: called functions take &tty_struct->ldisc_sem and
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* &tty_struct->termios_rwsem locks
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*
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* Returns: 0 on success, an error otherwise
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*/
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static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
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{
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struct ktermios tmp_termios;
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@ -622,16 +616,16 @@ static void set_sgflags(struct ktermios *termios, int flags)
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}
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/**
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* set_sgttyb - set legacy terminal values
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* @tty: tty structure
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* @sgttyb: pointer to old style terminal structure
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* set_sgttyb - set legacy terminal values
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* @tty: tty structure
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* @sgttyb: pointer to old style terminal structure
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*
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* Updates a terminal from the legacy BSD style terminal information
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* structure.
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* Updates a terminal from the legacy BSD style terminal information structure.
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*
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* Locking: termios_rwsem
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* Locking: &tty_struct->termios_rwsem
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*
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* Returns: 0 on success, an error otherwise
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*/
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static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
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{
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int retval;
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@ -733,14 +727,17 @@ static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
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#endif
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/**
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* tty_change_softcar - carrier change ioctl helper
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* @tty: tty to update
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* @enable: enable/disable CLOCAL
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* tty_change_softcar - carrier change ioctl helper
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* @tty: tty to update
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* @enable: enable/disable %CLOCAL
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*
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* Perform a change to the CLOCAL state and call into the driver
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* layer to make it visible. All done with the termios rwsem
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* Perform a change to the %CLOCAL state and call into the driver layer to make
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* it visible.
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*
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* Locking: &tty_struct->termios_rwsem.
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*
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* Returns: 0 on success, an error otherwise
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*/
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static int tty_change_softcar(struct tty_struct *tty, bool enable)
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{
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int ret = 0;
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@ -760,16 +757,15 @@ static int tty_change_softcar(struct tty_struct *tty, bool enable)
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}
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/**
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* tty_mode_ioctl - mode related ioctls
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* @tty: tty for the ioctl
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* @cmd: command
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* @arg: ioctl argument
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* tty_mode_ioctl - mode related ioctls
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* @tty: tty for the ioctl
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* @cmd: command
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* @arg: ioctl argument
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*
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* Perform non line discipline specific mode control ioctls. This
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* is designed to be called by line disciplines to ensure they provide
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* consistent mode setting.
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* Perform non-line discipline specific mode control ioctls. This is designed
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* to be called by line disciplines to ensure they provide consistent mode
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* setting.
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*/
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int tty_mode_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
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{
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struct tty_struct *real_tty;
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