585 lines
22 KiB
C
585 lines
22 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TTY_DRIVER_H
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#define _LINUX_TTY_DRIVER_H
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#include <linux/export.h>
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#include <linux/fs.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/cdev.h>
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#include <linux/uaccess.h>
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#include <linux/termios.h>
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#include <linux/seq_file.h>
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struct tty_struct;
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struct tty_driver;
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struct serial_icounter_struct;
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struct serial_struct;
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/**
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* struct tty_operations -- interface between driver and tty
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*
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* @lookup: ``struct tty_struct *()(struct tty_driver *self, struct file *,
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* int idx)``
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*
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* Return the tty device corresponding to @idx, %NULL if there is not
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* one currently in use and an %ERR_PTR value on error. Called under
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* %tty_mutex (for now!)
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*
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* Optional method. Default behaviour is to use the @self->ttys array.
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*
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* @install: ``int ()(struct tty_driver *self, struct tty_struct *tty)``
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*
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* Install a new @tty into the @self's internal tables. Used in
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* conjunction with @lookup and @remove methods.
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*
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* Optional method. Default behaviour is to use the @self->ttys array.
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*
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* @remove: ``void ()(struct tty_driver *self, struct tty_struct *tty)``
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*
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* Remove a closed @tty from the @self's internal tables. Used in
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* conjunction with @lookup and @remove methods.
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*
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* Optional method. Default behaviour is to use the @self->ttys array.
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*
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* @open: ``int ()(struct tty_struct *tty, struct file *)``
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*
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* This routine is called when a particular @tty device is opened. This
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* routine is mandatory; if this routine is not filled in, the attempted
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* open will fail with %ENODEV.
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*
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* Required method. Called with tty lock held. May sleep.
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*
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* @close: ``void ()(struct tty_struct *tty, struct file *)``
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*
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* This routine is called when a particular @tty device is closed. At the
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* point of return from this call the driver must make no further ldisc
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* calls of any kind.
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*
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* Remark: called even if the corresponding @open() failed.
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*
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* Required method. Called with tty lock held. May sleep.
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*
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* @shutdown: ``void ()(struct tty_struct *tty)``
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*
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* This routine is called under the tty lock when a particular @tty device
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* is closed for the last time. It executes before the @tty resources
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* are freed so may execute while another function holds a @tty kref.
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*
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* @cleanup: ``void ()(struct tty_struct *tty)``
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*
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* This routine is called asynchronously when a particular @tty device
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* is closed for the last time freeing up the resources. This is
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* actually the second part of shutdown for routines that might sleep.
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*
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* @write: ``ssize_t ()(struct tty_struct *tty, const u8 *buf, size_t count)``
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*
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* This routine is called by the kernel to write a series (@count) of
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* characters (@buf) to the @tty device. The characters may come from
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* user space or kernel space. This routine will return the
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* number of characters actually accepted for writing.
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*
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* May occur in parallel in special cases. Because this includes panic
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* paths drivers generally shouldn't try and do clever locking here.
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*
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* Optional: Required for writable devices. May not sleep.
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*
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* @put_char: ``int ()(struct tty_struct *tty, u8 ch)``
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*
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* This routine is called by the kernel to write a single character @ch to
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* the @tty device. If the kernel uses this routine, it must call the
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* @flush_chars() routine (if defined) when it is done stuffing characters
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* into the driver. If there is no room in the queue, the character is
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* ignored.
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*
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* Optional: Kernel will use the @write method if not provided. Do not
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* call this function directly, call tty_put_char().
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*
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* @flush_chars: ``void ()(struct tty_struct *tty)``
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*
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* This routine is called by the kernel after it has written a
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* series of characters to the tty device using @put_char().
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*
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* Optional. Do not call this function directly, call
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* tty_driver_flush_chars().
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*
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* @write_room: ``unsigned int ()(struct tty_struct *tty)``
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*
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* This routine returns the numbers of characters the @tty driver
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* will accept for queuing to be written. This number is subject
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* to change as output buffers get emptied, or if the output flow
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* control is acted.
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*
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* The ldisc is responsible for being intelligent about multi-threading of
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* write_room/write calls
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*
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* Required if @write method is provided else not needed. Do not call this
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* function directly, call tty_write_room()
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*
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* @chars_in_buffer: ``unsigned int ()(struct tty_struct *tty)``
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*
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* This routine returns the number of characters in the device private
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* output queue. Used in tty_wait_until_sent() and for poll()
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* implementation.
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*
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* Optional: if not provided, it is assumed there is no queue on the
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* device. Do not call this function directly, call tty_chars_in_buffer().
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*
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* @ioctl: ``int ()(struct tty_struct *tty, unsigned int cmd,
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* unsigned long arg)``
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*
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* This routine allows the @tty driver to implement device-specific
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* ioctls. If the ioctl number passed in @cmd is not recognized by the
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* driver, it should return %ENOIOCTLCMD.
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*
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* Optional.
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*
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* @compat_ioctl: ``long ()(struct tty_struct *tty, unsigned int cmd,
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* unsigned long arg)``
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*
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* Implement ioctl processing for 32 bit process on 64 bit system.
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*
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* Optional.
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*
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* @set_termios: ``void ()(struct tty_struct *tty, const struct ktermios *old)``
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*
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* This routine allows the @tty driver to be notified when device's
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* termios settings have changed. New settings are in @tty->termios.
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* Previous settings are passed in the @old argument.
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*
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* The API is defined such that the driver should return the actual modes
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* selected. This means that the driver is responsible for modifying any
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* bits in @tty->termios it cannot fulfill to indicate the actual modes
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* being used.
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*
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* Optional. Called under the @tty->termios_rwsem. May sleep.
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*
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* @set_ldisc: ``void ()(struct tty_struct *tty)``
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*
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* This routine allows the @tty driver to be notified when the device's
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* line discipline is being changed. At the point this is done the
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* discipline is not yet usable.
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*
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* Optional. Called under the @tty->ldisc_sem and @tty->termios_rwsem.
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*
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* @throttle: ``void ()(struct tty_struct *tty)``
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*
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* This routine notifies the @tty driver that input buffers for the line
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* discipline are close to full, and it should somehow signal that no more
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* characters should be sent to the @tty.
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*
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* Serialization including with @unthrottle() is the job of the ldisc
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* layer.
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*
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* Optional: Always invoke via tty_throttle_safe(). Called under the
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* @tty->termios_rwsem.
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*
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* @unthrottle: ``void ()(struct tty_struct *tty)``
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*
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* This routine notifies the @tty driver that it should signal that
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* characters can now be sent to the @tty without fear of overrunning the
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* input buffers of the line disciplines.
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*
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* Optional. Always invoke via tty_unthrottle(). Called under the
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* @tty->termios_rwsem.
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*
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* @stop: ``void ()(struct tty_struct *tty)``
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*
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* This routine notifies the @tty driver that it should stop outputting
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* characters to the tty device.
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*
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* Called with @tty->flow.lock held. Serialized with @start() method.
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*
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* Optional. Always invoke via stop_tty().
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*
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* @start: ``void ()(struct tty_struct *tty)``
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*
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* This routine notifies the @tty driver that it resumed sending
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* characters to the @tty device.
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*
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* Called with @tty->flow.lock held. Serialized with stop() method.
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*
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* Optional. Always invoke via start_tty().
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*
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* @hangup: ``void ()(struct tty_struct *tty)``
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*
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* This routine notifies the @tty driver that it should hang up the @tty
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* device.
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*
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* Optional. Called with tty lock held.
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*
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* @break_ctl: ``int ()(struct tty_struct *tty, int state)``
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*
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* This optional routine requests the @tty driver to turn on or off BREAK
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* status on the RS-232 port. If @state is -1, then the BREAK status
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* should be turned on; if @state is 0, then BREAK should be turned off.
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*
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* If this routine is implemented, the high-level tty driver will handle
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* the following ioctls: %TCSBRK, %TCSBRKP, %TIOCSBRK, %TIOCCBRK.
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*
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* If the driver sets %TTY_DRIVER_HARDWARE_BREAK in tty_alloc_driver(),
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* then the interface will also be called with actual times and the
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* hardware is expected to do the delay work itself. 0 and -1 are still
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* used for on/off.
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*
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* Optional: Required for %TCSBRK/%BRKP/etc. handling. May sleep.
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*
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* @flush_buffer: ``void ()(struct tty_struct *tty)``
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*
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* This routine discards device private output buffer. Invoked on close,
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* hangup, to implement %TCOFLUSH ioctl and similar.
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*
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* Optional: if not provided, it is assumed there is no queue on the
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* device. Do not call this function directly, call
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* tty_driver_flush_buffer().
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*
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* @wait_until_sent: ``void ()(struct tty_struct *tty, int timeout)``
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*
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* This routine waits until the device has written out all of the
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* characters in its transmitter FIFO. Or until @timeout (in jiffies) is
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* reached.
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*
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* Optional: If not provided, the device is assumed to have no FIFO.
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* Usually correct to invoke via tty_wait_until_sent(). May sleep.
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*
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* @send_xchar: ``void ()(struct tty_struct *tty, u8 ch)``
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*
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* This routine is used to send a high-priority XON/XOFF character (@ch)
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* to the @tty device.
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*
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* Optional: If not provided, then the @write method is called under
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* the @tty->atomic_write_lock to keep it serialized with the ldisc.
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*
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* @tiocmget: ``int ()(struct tty_struct *tty)``
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*
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* This routine is used to obtain the modem status bits from the @tty
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* driver.
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*
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* Optional: If not provided, then %ENOTTY is returned from the %TIOCMGET
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* ioctl. Do not call this function directly, call tty_tiocmget().
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*
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* @tiocmset: ``int ()(struct tty_struct *tty,
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* unsigned int set, unsigned int clear)``
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*
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* This routine is used to set the modem status bits to the @tty driver.
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* First, @clear bits should be cleared, then @set bits set.
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*
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* Optional: If not provided, then %ENOTTY is returned from the %TIOCMSET
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* ioctl. Do not call this function directly, call tty_tiocmset().
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*
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* @resize: ``int ()(struct tty_struct *tty, struct winsize *ws)``
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*
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* Called when a termios request is issued which changes the requested
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* terminal geometry to @ws.
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*
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* Optional: the default action is to update the termios structure
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* without error. This is usually the correct behaviour. Drivers should
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* not force errors here if they are not resizable objects (e.g. a serial
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* line). See tty_do_resize() if you need to wrap the standard method
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* in your own logic -- the usual case.
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*
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* @get_icount: ``int ()(struct tty_struct *tty,
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* struct serial_icounter *icount)``
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*
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* Called when the @tty device receives a %TIOCGICOUNT ioctl. Passed a
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* kernel structure @icount to complete.
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*
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* Optional: called only if provided, otherwise %ENOTTY will be returned.
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*
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* @get_serial: ``int ()(struct tty_struct *tty, struct serial_struct *p)``
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*
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* Called when the @tty device receives a %TIOCGSERIAL ioctl. Passed a
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* kernel structure @p (&struct serial_struct) to complete.
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*
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* Optional: called only if provided, otherwise %ENOTTY will be returned.
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* Do not call this function directly, call tty_tiocgserial().
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*
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* @set_serial: ``int ()(struct tty_struct *tty, struct serial_struct *p)``
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*
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* Called when the @tty device receives a %TIOCSSERIAL ioctl. Passed a
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* kernel structure @p (&struct serial_struct) to set the values from.
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*
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* Optional: called only if provided, otherwise %ENOTTY will be returned.
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* Do not call this function directly, call tty_tiocsserial().
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*
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* @show_fdinfo: ``void ()(struct tty_struct *tty, struct seq_file *m)``
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*
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* Called when the @tty device file descriptor receives a fdinfo request
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* from VFS (to show in /proc/<pid>/fdinfo/). @m should be filled with
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* information.
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*
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* Optional: called only if provided, otherwise nothing is written to @m.
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* Do not call this function directly, call tty_show_fdinfo().
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*
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* @poll_init: ``int ()(struct tty_driver *driver, int line, char *options)``
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*
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* kgdboc support (Documentation/dev-tools/kgdb.rst). This routine is
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* called to initialize the HW for later use by calling @poll_get_char or
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* @poll_put_char.
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*
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* Optional: called only if provided, otherwise skipped as a non-polling
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* driver.
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*
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* @poll_get_char: ``int ()(struct tty_driver *driver, int line)``
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*
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* kgdboc support (see @poll_init). @driver should read a character from a
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* tty identified by @line and return it.
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*
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* Optional: called only if @poll_init provided.
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*
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* @poll_put_char: ``void ()(struct tty_driver *driver, int line, char ch)``
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*
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* kgdboc support (see @poll_init). @driver should write character @ch to
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* a tty identified by @line.
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*
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* Optional: called only if @poll_init provided.
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*
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* @proc_show: ``int ()(struct seq_file *m, void *driver)``
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*
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* Driver @driver (cast to &struct tty_driver) can show additional info in
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* /proc/tty/driver/<driver_name>. It is enough to fill in the information
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* into @m.
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*
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* Optional: called only if provided, otherwise no /proc entry created.
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*
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* This structure defines the interface between the low-level tty driver and
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* the tty routines. These routines can be defined. Unless noted otherwise,
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* they are optional, and can be filled in with a %NULL pointer.
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*/
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struct tty_operations {
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struct tty_struct * (*lookup)(struct tty_driver *driver,
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struct file *filp, int idx);
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int (*install)(struct tty_driver *driver, struct tty_struct *tty);
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void (*remove)(struct tty_driver *driver, struct tty_struct *tty);
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int (*open)(struct tty_struct * tty, struct file * filp);
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void (*close)(struct tty_struct * tty, struct file * filp);
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void (*shutdown)(struct tty_struct *tty);
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void (*cleanup)(struct tty_struct *tty);
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ssize_t (*write)(struct tty_struct *tty, const u8 *buf, size_t count);
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int (*put_char)(struct tty_struct *tty, u8 ch);
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void (*flush_chars)(struct tty_struct *tty);
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unsigned int (*write_room)(struct tty_struct *tty);
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unsigned int (*chars_in_buffer)(struct tty_struct *tty);
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int (*ioctl)(struct tty_struct *tty,
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unsigned int cmd, unsigned long arg);
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long (*compat_ioctl)(struct tty_struct *tty,
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unsigned int cmd, unsigned long arg);
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void (*set_termios)(struct tty_struct *tty, const struct ktermios *old);
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void (*throttle)(struct tty_struct * tty);
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void (*unthrottle)(struct tty_struct * tty);
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void (*stop)(struct tty_struct *tty);
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void (*start)(struct tty_struct *tty);
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void (*hangup)(struct tty_struct *tty);
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int (*break_ctl)(struct tty_struct *tty, int state);
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void (*flush_buffer)(struct tty_struct *tty);
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void (*set_ldisc)(struct tty_struct *tty);
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void (*wait_until_sent)(struct tty_struct *tty, int timeout);
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void (*send_xchar)(struct tty_struct *tty, u8 ch);
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int (*tiocmget)(struct tty_struct *tty);
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int (*tiocmset)(struct tty_struct *tty,
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unsigned int set, unsigned int clear);
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int (*resize)(struct tty_struct *tty, struct winsize *ws);
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int (*get_icount)(struct tty_struct *tty,
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struct serial_icounter_struct *icount);
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int (*get_serial)(struct tty_struct *tty, struct serial_struct *p);
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int (*set_serial)(struct tty_struct *tty, struct serial_struct *p);
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void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m);
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#ifdef CONFIG_CONSOLE_POLL
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int (*poll_init)(struct tty_driver *driver, int line, char *options);
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int (*poll_get_char)(struct tty_driver *driver, int line);
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void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
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#endif
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int (*proc_show)(struct seq_file *m, void *driver);
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} __randomize_layout;
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/**
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* struct tty_driver -- driver for TTY devices
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*
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* @kref: reference counting. Reaching zero frees all the internals and the
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* driver.
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* @cdevs: allocated/registered character /dev devices
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* @owner: modules owning this driver. Used drivers cannot be rmmod'ed.
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* Automatically set by tty_alloc_driver().
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* @driver_name: name of the driver used in /proc/tty
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* @name: used for constructing /dev node name
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* @name_base: used as a number base for constructing /dev node name
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* @major: major /dev device number (zero for autoassignment)
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* @minor_start: the first minor /dev device number
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* @num: number of devices allocated
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* @type: type of tty driver (%TTY_DRIVER_TYPE_)
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* @subtype: subtype of tty driver (%SYSTEM_TYPE_, %PTY_TYPE_, %SERIAL_TYPE_)
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* @init_termios: termios to set to each tty initially (e.g. %tty_std_termios)
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* @flags: tty driver flags (%TTY_DRIVER_)
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* @proc_entry: proc fs entry, used internally
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* @other: driver of the linked tty; only used for the PTY driver
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* @ttys: array of active &struct tty_struct, set by tty_standard_install()
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* @ports: array of &struct tty_port; can be set during initialization by
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* tty_port_link_device() and similar
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* @termios: storage for termios at each TTY close for the next open
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* @driver_state: pointer to driver's arbitrary data
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* @ops: driver hooks for TTYs. Set them using tty_set_operations(). Use &struct
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* tty_port helpers in them as much as possible.
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* @tty_drivers: used internally to link tty_drivers together
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*
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* The usual handling of &struct tty_driver is to allocate it by
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* tty_alloc_driver(), set up all the necessary members, and register it by
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* tty_register_driver(). At last, the driver is torn down by calling
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* tty_unregister_driver() followed by tty_driver_kref_put().
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*
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* The fields required to be set before calling tty_register_driver() include
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* @driver_name, @name, @type, @subtype, @init_termios, and @ops.
|
|
*/
|
|
struct tty_driver {
|
|
struct kref kref;
|
|
struct cdev **cdevs;
|
|
struct module *owner;
|
|
const char *driver_name;
|
|
const char *name;
|
|
int name_base;
|
|
int major;
|
|
int minor_start;
|
|
unsigned int num;
|
|
short type;
|
|
short subtype;
|
|
struct ktermios init_termios;
|
|
unsigned long flags;
|
|
struct proc_dir_entry *proc_entry;
|
|
struct tty_driver *other;
|
|
|
|
/*
|
|
* Pointer to the tty data structures
|
|
*/
|
|
struct tty_struct **ttys;
|
|
struct tty_port **ports;
|
|
struct ktermios **termios;
|
|
void *driver_state;
|
|
|
|
/*
|
|
* Driver methods
|
|
*/
|
|
|
|
const struct tty_operations *ops;
|
|
struct list_head tty_drivers;
|
|
} __randomize_layout;
|
|
|
|
extern struct list_head tty_drivers;
|
|
|
|
struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner,
|
|
unsigned long flags);
|
|
struct tty_driver *tty_find_polling_driver(char *name, int *line);
|
|
|
|
void tty_driver_kref_put(struct tty_driver *driver);
|
|
|
|
/* Use TTY_DRIVER_* flags below */
|
|
#define tty_alloc_driver(lines, flags) \
|
|
__tty_alloc_driver(lines, THIS_MODULE, flags)
|
|
|
|
static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)
|
|
{
|
|
kref_get(&d->kref);
|
|
return d;
|
|
}
|
|
|
|
static inline void tty_set_operations(struct tty_driver *driver,
|
|
const struct tty_operations *op)
|
|
{
|
|
driver->ops = op;
|
|
}
|
|
|
|
/**
|
|
* DOC: TTY Driver Flags
|
|
*
|
|
* TTY_DRIVER_RESET_TERMIOS
|
|
* Requests the tty layer to reset the termios setting when the last
|
|
* process has closed the device. Used for PTYs, in particular.
|
|
*
|
|
* TTY_DRIVER_REAL_RAW
|
|
* Indicates that the driver will guarantee not to set any special
|
|
* character handling flags if this is set for the tty:
|
|
*
|
|
* ``(IGNBRK || (!BRKINT && !PARMRK)) && (IGNPAR || !INPCK)``
|
|
*
|
|
* That is, if there is no reason for the driver to
|
|
* send notifications of parity and break characters up to the line
|
|
* driver, it won't do so. This allows the line driver to optimize for
|
|
* this case if this flag is set. (Note that there is also a promise, if
|
|
* the above case is true, not to signal overruns, either.)
|
|
*
|
|
* TTY_DRIVER_DYNAMIC_DEV
|
|
* The individual tty devices need to be registered with a call to
|
|
* tty_register_device() when the device is found in the system and
|
|
* unregistered with a call to tty_unregister_device() so the devices will
|
|
* be show up properly in sysfs. If not set, all &tty_driver.num entries
|
|
* will be created by the tty core in sysfs when tty_register_driver() is
|
|
* called. This is to be used by drivers that have tty devices that can
|
|
* appear and disappear while the main tty driver is registered with the
|
|
* tty core.
|
|
*
|
|
* TTY_DRIVER_DEVPTS_MEM
|
|
* Don't use the standard arrays (&tty_driver.ttys and
|
|
* &tty_driver.termios), instead use dynamic memory keyed through the
|
|
* devpts filesystem. This is only applicable to the PTY driver.
|
|
*
|
|
* TTY_DRIVER_HARDWARE_BREAK
|
|
* Hardware handles break signals. Pass the requested timeout to the
|
|
* &tty_operations.break_ctl instead of using a simple on/off interface.
|
|
*
|
|
* TTY_DRIVER_DYNAMIC_ALLOC
|
|
* Do not allocate structures which are needed per line for this driver
|
|
* (&tty_driver.ports) as it would waste memory. The driver will take
|
|
* care. This is only applicable to the PTY driver.
|
|
*
|
|
* TTY_DRIVER_UNNUMBERED_NODE
|
|
* Do not create numbered ``/dev`` nodes. For example, create
|
|
* ``/dev/ttyprintk`` and not ``/dev/ttyprintk0``. Applicable only when a
|
|
* driver for a single tty device is being allocated.
|
|
*/
|
|
#define TTY_DRIVER_INSTALLED 0x0001
|
|
#define TTY_DRIVER_RESET_TERMIOS 0x0002
|
|
#define TTY_DRIVER_REAL_RAW 0x0004
|
|
#define TTY_DRIVER_DYNAMIC_DEV 0x0008
|
|
#define TTY_DRIVER_DEVPTS_MEM 0x0010
|
|
#define TTY_DRIVER_HARDWARE_BREAK 0x0020
|
|
#define TTY_DRIVER_DYNAMIC_ALLOC 0x0040
|
|
#define TTY_DRIVER_UNNUMBERED_NODE 0x0080
|
|
|
|
/* tty driver types */
|
|
#define TTY_DRIVER_TYPE_SYSTEM 0x0001
|
|
#define TTY_DRIVER_TYPE_CONSOLE 0x0002
|
|
#define TTY_DRIVER_TYPE_SERIAL 0x0003
|
|
#define TTY_DRIVER_TYPE_PTY 0x0004
|
|
#define TTY_DRIVER_TYPE_SCC 0x0005 /* scc driver */
|
|
#define TTY_DRIVER_TYPE_SYSCONS 0x0006
|
|
|
|
/* system subtypes (magic, used by tty_io.c) */
|
|
#define SYSTEM_TYPE_TTY 0x0001
|
|
#define SYSTEM_TYPE_CONSOLE 0x0002
|
|
#define SYSTEM_TYPE_SYSCONS 0x0003
|
|
#define SYSTEM_TYPE_SYSPTMX 0x0004
|
|
|
|
/* pty subtypes (magic, used by tty_io.c) */
|
|
#define PTY_TYPE_MASTER 0x0001
|
|
#define PTY_TYPE_SLAVE 0x0002
|
|
|
|
/* serial subtype definitions */
|
|
#define SERIAL_TYPE_NORMAL 1
|
|
|
|
int tty_register_driver(struct tty_driver *driver);
|
|
void tty_unregister_driver(struct tty_driver *driver);
|
|
struct device *tty_register_device(struct tty_driver *driver, unsigned index,
|
|
struct device *dev);
|
|
struct device *tty_register_device_attr(struct tty_driver *driver,
|
|
unsigned index, struct device *device, void *drvdata,
|
|
const struct attribute_group **attr_grp);
|
|
void tty_unregister_device(struct tty_driver *driver, unsigned index);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
void proc_tty_register_driver(struct tty_driver *);
|
|
void proc_tty_unregister_driver(struct tty_driver *);
|
|
#else
|
|
static inline void proc_tty_register_driver(struct tty_driver *d) {}
|
|
static inline void proc_tty_unregister_driver(struct tty_driver *d) {}
|
|
#endif
|
|
|
|
#endif /* #ifdef _LINUX_TTY_DRIVER_H */
|