tty: combine tty_ldisc_ops docs into kernel-doc
In Documentation/driver-api/serial/tty.rst, there are duplicated texts about some struct tty_ldisc_ops' hooks. Combine them into existing kernel-doc comments of struct tty_ldisc_ops and drop them from the Documentation/. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20211126081611.11001-9-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby
Greg Kroah-Hartman
Родитель
29d5ef6859
Коммит
40f4268cdd
|
|
@ -35,99 +35,8 @@ about to enter and exit although this detail matters not).
|
|||
Line Discipline Methods
|
||||
-----------------------
|
||||
|
||||
TTY side interfaces
|
||||
^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
======================= =======================================================
|
||||
open() Called when the line discipline is attached to
|
||||
the terminal. No other call into the line
|
||||
discipline for this tty will occur until it
|
||||
completes successfully. Should initialize any
|
||||
state needed by the ldisc, and set receive_room
|
||||
in the tty_struct to the maximum amount of data
|
||||
the line discipline is willing to accept from the
|
||||
driver with a single call to receive_buf().
|
||||
Returning an error will prevent the ldisc from
|
||||
being attached. Can sleep.
|
||||
|
||||
close() This is called on a terminal when the line
|
||||
discipline is being unplugged. At the point of
|
||||
execution no further users will enter the
|
||||
ldisc code for this tty. Can sleep.
|
||||
|
||||
hangup() Called when the tty line is hung up.
|
||||
The line discipline should cease I/O to the tty.
|
||||
No further calls into the ldisc code will occur.
|
||||
Can sleep.
|
||||
|
||||
read() (optional) A process requests reading data from
|
||||
the line. Multiple read calls may occur in parallel
|
||||
and the ldisc must deal with serialization issues.
|
||||
If not defined, the process will receive an EIO
|
||||
error. May sleep.
|
||||
|
||||
write() (optional) A process requests writing data to the
|
||||
line. Multiple write calls are serialized by the
|
||||
tty layer for the ldisc. If not defined, the
|
||||
process will receive an EIO error. May sleep.
|
||||
|
||||
flush_buffer() (optional) May be called at any point between
|
||||
open and close, and instructs the line discipline
|
||||
to empty its input buffer.
|
||||
|
||||
set_termios() (optional) Called on termios structure changes.
|
||||
The caller passes the old termios data and the
|
||||
current data is in the tty. Called under the
|
||||
termios semaphore so allowed to sleep. Serialized
|
||||
against itself only.
|
||||
|
||||
poll() (optional) Check the status for the poll/select
|
||||
calls. Multiple poll calls may occur in parallel.
|
||||
May sleep.
|
||||
|
||||
ioctl() (optional) Called when an ioctl is handed to the
|
||||
tty layer that might be for the ldisc. Multiple
|
||||
ioctl calls may occur in parallel. May sleep.
|
||||
|
||||
compat_ioctl() (optional) Called when a 32 bit ioctl is handed
|
||||
to the tty layer that might be for the ldisc.
|
||||
Multiple ioctl calls may occur in parallel.
|
||||
May sleep.
|
||||
======================= =======================================================
|
||||
|
||||
Driver Side Interfaces
|
||||
^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
======================= =======================================================
|
||||
receive_buf() (optional) Called by the low-level driver to hand
|
||||
a buffer of received bytes to the ldisc for
|
||||
processing. The number of bytes is guaranteed not
|
||||
to exceed the current value of tty->receive_room.
|
||||
All bytes must be processed.
|
||||
|
||||
receive_buf2() (optional) Called by the low-level driver to hand
|
||||
a buffer of received bytes to the ldisc for
|
||||
processing. Returns the number of bytes processed.
|
||||
|
||||
If both receive_buf() and receive_buf2() are
|
||||
defined, receive_buf2() should be preferred.
|
||||
|
||||
write_wakeup() May be called at any point between open and close.
|
||||
The TTY_DO_WRITE_WAKEUP flag indicates if a call
|
||||
is needed but always races versus calls. Thus the
|
||||
ldisc must be careful about setting order and to
|
||||
handle unexpected calls. Must not sleep.
|
||||
|
||||
The driver is forbidden from calling this directly
|
||||
from the ->write call from the ldisc as the ldisc
|
||||
is permitted to call the driver write method from
|
||||
this function. In such a situation defer it.
|
||||
|
||||
dcd_change() Report to the tty line the current DCD pin status
|
||||
changes and the relative timestamp. The timestamp
|
||||
cannot be NULL.
|
||||
======================= =======================================================
|
||||
|
||||
.. kernel-doc:: include/linux/tty_ldisc.h
|
||||
:identifiers: tty_ldisc_ops
|
||||
|
||||
Driver Access
|
||||
^^^^^^^^^^^^^
|
||||
|
|
|
|||
|
|
@ -61,33 +61,45 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* @name: name of this ldisc rendered in /proc/tty/ldiscs
|
||||
* @num: ``N_*`` number (%N_TTY, %N_HDLC, ...) reserved to this ldisc
|
||||
*
|
||||
* @open: ``int ()(struct tty_struct *tty)``
|
||||
* @open: [TTY] ``int ()(struct tty_struct *tty)``
|
||||
*
|
||||
* This function is called when the line discipline is associated with the
|
||||
* @tty. The line discipline can use this as an opportunity to initialize
|
||||
* any state needed by the ldisc routines.
|
||||
* @tty. No other call into the line discipline for this tty will occur
|
||||
* until it completes successfully. It should initialize any state needed
|
||||
* by the ldisc, and set @tty->receive_room to the maximum amount of data
|
||||
* the line discipline is willing to accept from the driver with a single
|
||||
* call to @receive_buf(). Returning an error will prevent the ldisc from
|
||||
* being attached.
|
||||
*
|
||||
* @close: ``void ()(struct tty_struct *tty)``
|
||||
* Can sleep.
|
||||
*
|
||||
* @close: [TTY] ``void ()(struct tty_struct *tty)``
|
||||
*
|
||||
* This function is called when the line discipline is being shutdown,
|
||||
* either because the @tty is being closed or because the @tty is being
|
||||
* changed to use a new line discipline
|
||||
* changed to use a new line discipline. At the point of execution no
|
||||
* further users will enter the ldisc code for this tty.
|
||||
*
|
||||
* @flush_buffer: ``void ()(struct tty_struct *tty)``
|
||||
* Can sleep.
|
||||
*
|
||||
* @flush_buffer: [TTY] ``void ()(struct tty_struct *tty)``
|
||||
*
|
||||
* This function instructs the line discipline to clear its buffers of any
|
||||
* input characters it may have queued to be delivered to the user mode
|
||||
* process.
|
||||
* process. It may be called at any point between open and close.
|
||||
*
|
||||
* @read: ``ssize_t ()(struct tty_struct *tty, struct file *file,
|
||||
* @read: [TTY] ``ssize_t ()(struct tty_struct *tty, struct file *file,
|
||||
* unsigned char *buf, size_t nr)``
|
||||
*
|
||||
* This function is called when the user requests to read from the @tty.
|
||||
* The line discipline will return whatever characters it has buffered up
|
||||
* for the user. If this function is not defined, the user will receive
|
||||
* an %EIO error.
|
||||
* an %EIO error. Multiple read calls may occur in parallel and the ldisc
|
||||
* must deal with serialization issues.
|
||||
*
|
||||
* @write: ``ssize_t ()(struct tty_struct *tty, struct file *file,
|
||||
* Can sleep.
|
||||
*
|
||||
* @write: [TTY] ``ssize_t ()(struct tty_struct *tty, struct file *file,
|
||||
* const unsigned char *buf, size_t nr)``
|
||||
*
|
||||
* This function is called when the user requests to write to the @tty.
|
||||
|
|
@ -96,7 +108,9 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* characters first. If this function is not defined, the user will
|
||||
* receive an %EIO error.
|
||||
*
|
||||
* @ioctl: ``int ()(struct tty_struct *tty, unsigned int cmd,
|
||||
* Can sleep.
|
||||
*
|
||||
* @ioctl: [TTY] ``int ()(struct tty_struct *tty, unsigned int cmd,
|
||||
* unsigned long arg)``
|
||||
*
|
||||
* This function is called when the user requests an ioctl which is not
|
||||
|
|
@ -106,7 +120,7 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* discpline. So a low-level driver can "grab" an ioctl request before
|
||||
* the line discpline has a chance to see it.
|
||||
*
|
||||
* @compat_ioctl: ``int ()(struct tty_struct *tty, unsigned int cmd,
|
||||
* @compat_ioctl: [TTY] ``int ()(struct tty_struct *tty, unsigned int cmd,
|
||||
* unsigned long arg)``
|
||||
*
|
||||
* Process ioctl calls from 32-bit process on 64-bit system.
|
||||
|
|
@ -116,27 +130,29 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* a pointer to wordsize-sensitive structure belongs here, but most of
|
||||
* ldiscs will happily leave it %NULL.
|
||||
*
|
||||
* @set_termios: ``void ()(struct tty_struct *tty, struct ktermios *old)``
|
||||
* @set_termios: [TTY] ``void ()(struct tty_struct *tty, struct ktermios *old)``
|
||||
*
|
||||
* This function notifies the line discpline that a change has been made
|
||||
* to the termios structure.
|
||||
*
|
||||
* @poll: ``int ()(struct tty_struct *tty, struct file *file,
|
||||
* @poll: [TTY] ``int ()(struct tty_struct *tty, struct file *file,
|
||||
* struct poll_table_struct *wait)``
|
||||
*
|
||||
* This function is called when a user attempts to select/poll on a @tty
|
||||
* device. It is solely the responsibility of the line discipline to
|
||||
* handle poll requests.
|
||||
*
|
||||
* @hangup: ``void ()(struct tty_struct *tty)``
|
||||
* @hangup: [TTY] ``void ()(struct tty_struct *tty)``
|
||||
*
|
||||
* Called on a hangup. Tells the discipline that it should cease I/O to
|
||||
* the tty driver. Can sleep. The driver should seek to perform this
|
||||
* action quickly but should wait until any pending driver I/O is
|
||||
* completed.
|
||||
* the tty driver. The driver should seek to perform this action quickly
|
||||
* but should wait until any pending driver I/O is completed. No further
|
||||
* calls into the ldisc code will occur.
|
||||
*
|
||||
* @receive_buf: ``void ()(struct tty_struct *tty, const unsigned char *cp,
|
||||
* const char *fp, int count)``
|
||||
* Can sleep.
|
||||
*
|
||||
* @receive_buf: [DRV] ``void ()(struct tty_struct *tty,
|
||||
* const unsigned char *cp, const char *fp, int count)``
|
||||
*
|
||||
* This function is called by the low-level tty driver to send characters
|
||||
* received by the hardware to the line discpline for processing. @cp is
|
||||
|
|
@ -145,7 +161,7 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* character was received with a parity error, etc. @fp may be %NULL to
|
||||
* indicate all data received is %TTY_NORMAL.
|
||||
*
|
||||
* @write_wakeup: ``void ()(struct tty_struct *tty)``
|
||||
* @write_wakeup: [DRV] ``void ()(struct tty_struct *tty)``
|
||||
*
|
||||
* This function is called by the low-level tty driver to signal that line
|
||||
* discpline should try to send more characters to the low-level driver
|
||||
|
|
@ -154,13 +170,13 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* send, please arise a tasklet or workqueue to do the real data transfer.
|
||||
* Do not send data in this hook, it may lead to a deadlock.
|
||||
*
|
||||
* @dcd_change: ``void ()(struct tty_struct *tty, unsigned int status)``
|
||||
* @dcd_change: [DRV] ``void ()(struct tty_struct *tty, unsigned int status)``
|
||||
*
|
||||
* Tells the discipline that the DCD pin has changed its status. Used
|
||||
* exclusively by the %N_PPS (Pulse-Per-Second) line discipline.
|
||||
*
|
||||
* @receive_buf2: ``int ()(struct tty_struct *tty, const unsigned char *cp,
|
||||
* const char *fp, int count)``
|
||||
* @receive_buf2: [DRV] ``int ()(struct tty_struct *tty,
|
||||
* const unsigned char *cp, const char *fp, int count)``
|
||||
*
|
||||
* This function is called by the low-level tty driver to send characters
|
||||
* received by the hardware to the line discpline for processing. @cp is a
|
||||
|
|
@ -176,6 +192,9 @@ int ldsem_down_write_nested(struct ld_semaphore *sem, int subclass,
|
|||
* implementation and the tty routines. The above routines can be defined.
|
||||
* Unless noted otherwise, they are optional, and can be filled in with a %NULL
|
||||
* pointer.
|
||||
*
|
||||
* Hooks marked [TTY] are invoked from the TTY core, the [DRV] ones from the
|
||||
* tty_driver side.
|
||||
*/
|
||||
struct tty_ldisc_ops {
|
||||
char *name;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче