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 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_TTY_DRIVER_H
 #define _LINUX_TTY_DRIVER_H
 
 #include <linux/export.h>
 #include <linux/fs.h>
 #include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/cdev.h>
 #include <linux/termios.h>
 #include <linux/seq_file.h>
 
 struct tty_struct;
 struct tty_driver;
 struct serial_icounter_struct;
 struct serial_struct;
 
 /**
  * struct tty_operations -- interface between driver and tty
  *
  * @lookup: ``struct tty_struct *()(struct tty_driver *self, struct file *,
  *                  int idx)``
  *
  *  Return the tty device corresponding to @idx, %NULL if there is not
  *  one currently in use and an %ERR_PTR value on error. Called under
  *  %tty_mutex (for now!)
  *
  *  Optional method. Default behaviour is to use the @self->ttys array.
  *
  * @install: ``int ()(struct tty_driver *self, struct tty_struct *tty)``
  *
  *  Install a new @tty into the @self's internal tables. Used in
  *  conjunction with @lookup and @remove methods.
  *
  *  Optional method. Default behaviour is to use the @self->ttys array.
  *
  * @remove: ``void ()(struct tty_driver *self, struct tty_struct *tty)``
  *
  *  Remove a closed @tty from the @self's internal tables. Used in
  *  conjunction with @lookup and @remove methods.
  *
  *  Optional method. Default behaviour is to use the @self->ttys array.
  *
  * @open: ``int ()(struct tty_struct *tty, struct file *)``
  *
  *  This routine is called when a particular @tty device is opened. This
  *  routine is mandatory; if this routine is not filled in, the attempted
  *  open will fail with %ENODEV.
  *
  *  Required method. Called with tty lock held. May sleep.
  *
  * @close: ``void ()(struct tty_struct *tty, struct file *)``
  *
  *  This routine is called when a particular @tty device is closed. At the
  *  point of return from this call the driver must make no further ldisc
  *  calls of any kind.
  *
  *  Remark: called even if the corresponding @open() failed.
  *
  *  Required method. Called with tty lock held. May sleep.
  *
  * @shutdown: ``void ()(struct tty_struct *tty)``
  *
  *  This routine is called under the tty lock when a particular @tty device
  *  is closed for the last time. It executes before the @tty resources
  *  are freed so may execute while another function holds a @tty kref.
  *
  * @cleanup: ``void ()(struct tty_struct *tty)``
  *
  *  This routine is called asynchronously when a particular @tty device
  *  is closed for the last time freeing up the resources. This is
  *  actually the second part of shutdown for routines that might sleep.
  *
  * @write: ``int ()(struct tty_struct *tty, const unsigned char *buf,
  *          int count)``
  *
  *  This routine is called by the kernel to write a series (@count) of
  *  characters (@buf) to the @tty device. The characters may come from
  *  user space or kernel space.  This routine will return the
  *  number of characters actually accepted for writing.
  *
  *  May occur in parallel in special cases. Because this includes panic
  *  paths drivers generally shouldn't try and do clever locking here.
  *
  *  Optional: Required for writable devices. May not sleep.
  *
  * @put_char: ``int ()(struct tty_struct *tty, unsigned char ch)``
  *
  *  This routine is called by the kernel to write a single character @ch to
  *  the @tty device. If the kernel uses this routine, it must call the
  *  @flush_chars() routine (if defined) when it is done stuffing characters
  *  into the driver. If there is no room in the queue, the character is
  *  ignored.
  *
  *  Optional: Kernel will use the @write method if not provided. Do not
  *  call this function directly, call tty_put_char().
  *
  * @flush_chars: ``void ()(struct tty_struct *tty)``
  *
  *  This routine is called by the kernel after it has written a
  *  series of characters to the tty device using @put_char().
  *
  *  Optional. Do not call this function directly, call
  *  tty_driver_flush_chars().
  *
  * @write_room: ``unsigned int ()(struct tty_struct *tty)``
  *
  *  This routine returns the numbers of characters the @tty driver
  *  will accept for queuing to be written.  This number is subject
  *  to change as output buffers get emptied, or if the output flow
  *  control is acted.
  *
  *  The ldisc is responsible for being intelligent about multi-threading of
  *  write_room/write calls
  *
  *  Required if @write method is provided else not needed. Do not call this
  *  function directly, call tty_write_room()
  *
  * @chars_in_buffer: ``unsigned int ()(struct tty_struct *tty)``
  *
  *  This routine returns the number of characters in the device private
  *  output queue. Used in tty_wait_until_sent() and for poll()
  *  implementation.
  *
  *  Optional: if not provided, it is assumed there is no queue on the
  *  device. Do not call this function directly, call tty_chars_in_buffer().
  *
  * @ioctl: ``int ()(struct tty_struct *tty, unsigned int cmd,
  *          unsigned long arg)``
  *
  *  This routine allows the @tty driver to implement device-specific
  *  ioctls. If the ioctl number passed in @cmd is not recognized by the
  *  driver, it should return %ENOIOCTLCMD.
  *
  *  Optional.
  *
  * @compat_ioctl: ``long ()(struct tty_struct *tty, unsigned int cmd,
  *            unsigned long arg)``
  *
  *  Implement ioctl processing for 32 bit process on 64 bit system.
  *
  *  Optional.
  *
  * @set_termios: ``void ()(struct tty_struct *tty, struct ktermios *old)``
  *
  *  This routine allows the @tty driver to be notified when device's
  *  termios settings have changed. New settings are in @tty->termios.
  *  Previous settings are passed in the @old argument.
  *
  *  The API is defined such that the driver should return the actual modes
  *  selected. This means that the driver is responsible for modifying any
  *  bits in @tty->termios it cannot fulfill to indicate the actual modes
  *  being used.
  *
  *  Optional. Called under the @tty->termios_rwsem. May sleep.
  *
  * @set_ldisc: ``void ()(struct tty_struct *tty)``
  *
  *  This routine allows the @tty driver to be notified when the device's
  *  line discipline is being changed. At the point this is done the
  *  discipline is not yet usable.
  *
  *  Optional. Called under the @tty->ldisc_sem and @tty->termios_rwsem.
  *
  * @throttle: ``void ()(struct tty_struct *tty)``
  *
  *  This routine notifies the @tty driver that input buffers for the line
  *  discipline are close to full, and it should somehow signal that no more
  *  characters should be sent to the @tty.
  *
  *  Serialization including with @unthrottle() is the job of the ldisc
  *  layer.
  *
  *  Optional: Always invoke via tty_throttle_safe(). Called under the
  *  @tty->termios_rwsem.
  *
  * @unthrottle: ``void ()(struct tty_struct *tty)``
  *
  *  This routine notifies the @tty driver that it should signal that
  *  characters can now be sent to the @tty without fear of overrunning the
  *  input buffers of the line disciplines.
  *
  *  Optional. Always invoke via tty_unthrottle(). Called under the
  *  @tty->termios_rwsem.
  *
  * @stop: ``void ()(struct tty_struct *tty)``
  *
  *  This routine notifies the @tty driver that it should stop outputting
  *  characters to the tty device.
  *
  *  Called with @tty->flow.lock held. Serialized with @start() method.
  *
  *  Optional. Always invoke via stop_tty().
  *
  * @start: ``void ()(struct tty_struct *tty)``
  *
  *  This routine notifies the @tty driver that it resumed sending
  *  characters to the @tty device.
  *
  *  Called with @tty->flow.lock held. Serialized with stop() method.
  *
  *  Optional. Always invoke via start_tty().
  *
  * @hangup: ``void ()(struct tty_struct *tty)``
  *
  *  This routine notifies the @tty driver that it should hang up the @tty
  *  device.
  *
  *  Optional. Called with tty lock held.
  *
  * @break_ctl: ``int ()(struct tty_struct *tty, int state)``
  *
  *  This optional routine requests the @tty driver to turn on or off BREAK
  *  status on the RS-232 port. If @state is -1, then the BREAK status
  *  should be turned on; if @state is 0, then BREAK should be turned off.
  *
  *  If this routine is implemented, the high-level tty driver will handle
  *  the following ioctls: %TCSBRK, %TCSBRKP, %TIOCSBRK, %TIOCCBRK.
  *
  *  If the driver sets %TTY_DRIVER_HARDWARE_BREAK in tty_alloc_driver(),
  *  then the interface will also be called with actual times and the
  *  hardware is expected to do the delay work itself. 0 and -1 are still
  *  used for on/off.
  *
  *  Optional: Required for %TCSBRK/%BRKP/etc. handling. May sleep.
  *
  * @flush_buffer: ``void ()(struct tty_struct *tty)``
  *
  *  This routine discards device private output buffer. Invoked on close,
  *  hangup, to implement %TCOFLUSH ioctl and similar.
  *
  *  Optional: if not provided, it is assumed there is no queue on the
  *  device. Do not call this function directly, call
  *  tty_driver_flush_buffer().
  *
  * @wait_until_sent: ``void ()(struct tty_struct *tty, int timeout)``
  *
  *  This routine waits until the device has written out all of the
  *  characters in its transmitter FIFO. Or until @timeout (in jiffies) is
  *  reached.
  *
  *  Optional: If not provided, the device is assumed to have no FIFO.
  *  Usually correct to invoke via tty_wait_until_sent(). May sleep.
  *
  * @send_xchar: ``void ()(struct tty_struct *tty, char ch)``
  *
  *  This routine is used to send a high-priority XON/XOFF character (@ch)
  *  to the @tty device.
  *
  *  Optional: If not provided, then the @write method is called under
  *  the @tty->atomic_write_lock to keep it serialized with the ldisc.
  *
  * @tiocmget: ``int ()(struct tty_struct *tty)``
  *
  *  This routine is used to obtain the modem status bits from the @tty
  *  driver.
  *
  *  Optional: If not provided, then %ENOTTY is returned from the %TIOCMGET
  *  ioctl. Do not call this function directly, call tty_tiocmget().
  *
  * @tiocmset: ``int ()(struct tty_struct *tty,
  *             unsigned int set, unsigned int clear)``
  *
  *  This routine is used to set the modem status bits to the @tty driver.
  *  First, @clear bits should be cleared, then @set bits set.
  *
  *  Optional: If not provided, then %ENOTTY is returned from the %TIOCMSET
  *  ioctl. Do not call this function directly, call tty_tiocmset().
  *
  * @resize: ``int ()(struct tty_struct *tty, struct winsize *ws)``
  *
  *  Called when a termios request is issued which changes the requested
  *  terminal geometry to @ws.
  *
  *  Optional: the default action is to update the termios structure
  *  without error. This is usually the correct behaviour. Drivers should
  *  not force errors here if they are not resizable objects (e.g. a serial
  *  line). See tty_do_resize() if you need to wrap the standard method
  *  in your own logic -- the usual case.
  *
  * @get_icount: ``int ()(struct tty_struct *tty,
  *           struct serial_icounter *icount)``
  *
  *  Called when the @tty device receives a %TIOCGICOUNT ioctl. Passed a
  *  kernel structure @icount to complete.
  *
  *  Optional: called only if provided, otherwise %ENOTTY will be returned.
  *
  * @get_serial: ``int ()(struct tty_struct *tty, struct serial_struct *p)``
  *
  *  Called when the @tty device receives a %TIOCGSERIAL ioctl. Passed a
  *  kernel structure @p (&struct serial_struct) to complete.
  *
  *  Optional: called only if provided, otherwise %ENOTTY will be returned.
  *  Do not call this function directly, call tty_tiocgserial().
  *
  * @set_serial: ``int ()(struct tty_struct *tty, struct serial_struct *p)``
  *
  *  Called when the @tty device receives a %TIOCSSERIAL ioctl. Passed a
  *  kernel structure @p (&struct serial_struct) to set the values from.
  *
  *  Optional: called only if provided, otherwise %ENOTTY will be returned.
  *  Do not call this function directly, call tty_tiocsserial().
  *
  * @show_fdinfo: ``void ()(struct tty_struct *tty, struct seq_file *m)``
  *
  *  Called when the @tty device file descriptor receives a fdinfo request
  *  from VFS (to show in /proc/<pid>/fdinfo/). @m should be filled with
  *  information.
  *
  *  Optional: called only if provided, otherwise nothing is written to @m.
  *  Do not call this function directly, call tty_show_fdinfo().
  *
  * @poll_init: ``int ()(struct tty_driver *driver, int line, char *options)``
  *
  *  kgdboc support (Documentation/dev-tools/kgdb.rst). This routine is
  *  called to initialize the HW for later use by calling @poll_get_char or
  *  @poll_put_char.
  *
  *  Optional: called only if provided, otherwise skipped as a non-polling
  *  driver.
  *
  * @poll_get_char: ``int ()(struct tty_driver *driver, int line)``
  *
  *  kgdboc support (see @poll_init). @driver should read a character from a
  *  tty identified by @line and return it.
  *
  *  Optional: called only if @poll_init provided.
  *
  * @poll_put_char: ``void ()(struct tty_driver *driver, int line, char ch)``
  *
  *  kgdboc support (see @poll_init). @driver should write character @ch to
  *  a tty identified by @line.
  *
  *  Optional: called only if @poll_init provided.
  *
  * @proc_show: ``int ()(struct seq_file *m, void *driver)``
  *
  *  Driver @driver (cast to &struct tty_driver) can show additional info in
  *  /proc/tty/driver/<driver_name>. It is enough to fill in the information
  *  into @m.
  *
  *  Optional: called only if provided, otherwise no /proc entry created.
  *
  * This structure defines the interface between the low-level tty driver and
  * the tty routines. These routines can be defined. Unless noted otherwise,
  * they are optional, and can be filled in with a %NULL pointer.
  */
 struct tty_operations {
     struct tty_struct * (*lookup)(struct tty_driver *driver,
             struct file *filp, int idx);
     int  (*install)(struct tty_driver *driver, struct tty_struct *tty);
     void (*remove)(struct tty_driver *driver, struct tty_struct *tty);
     int  (*open)(struct tty_struct * tty, struct file * filp);
     void (*close)(struct tty_struct * tty, struct file * filp);
     void (*shutdown)(struct tty_struct *tty);
     void (*cleanup)(struct tty_struct *tty);
     int  (*write)(struct tty_struct * tty,
               const unsigned char *buf, int count);
     int  (*put_char)(struct tty_struct *tty, unsigned char ch);
     void (*flush_chars)(struct tty_struct *tty);
     unsigned int (*write_room)(struct tty_struct *tty);
     unsigned int (*chars_in_buffer)(struct tty_struct *tty);
     int  (*ioctl)(struct tty_struct *tty,
             unsigned int cmd, unsigned long arg);
     long (*compat_ioctl)(struct tty_struct *tty,
                  unsigned int cmd, unsigned long arg);
     void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
     void (*throttle)(struct tty_struct * tty);
     void (*unthrottle)(struct tty_struct * tty);
     void (*stop)(struct tty_struct *tty);
     void (*start)(struct tty_struct *tty);
     void (*hangup)(struct tty_struct *tty);
     int (*break_ctl)(struct tty_struct *tty, int state);
     void (*flush_buffer)(struct tty_struct *tty);
     void (*set_ldisc)(struct tty_struct *tty);
     void (*wait_until_sent)(struct tty_struct *tty, int timeout);
     void (*send_xchar)(struct tty_struct *tty, char ch);
     int (*tiocmget)(struct tty_struct *tty);
     int (*tiocmset)(struct tty_struct *tty,
             unsigned int set, unsigned int clear);
     int (*resize)(struct tty_struct *tty, struct winsize *ws);
     int (*get_icount)(struct tty_struct *tty,
                 struct serial_icounter_struct *icount);
     int  (*get_serial)(struct tty_struct *tty, struct serial_struct *p);
     int  (*set_serial)(struct tty_struct *tty, struct serial_struct *p);
     void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m);
 #ifdef CONFIG_CONSOLE_POLL
     int (*poll_init)(struct tty_driver *driver, int line, char *options);
     int (*poll_get_char)(struct tty_driver *driver, int line);
     void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
 #endif
     int (*proc_show)(struct seq_file *m, void *driver);
 } __randomize_layout;
 
 /**
  * struct tty_driver -- driver for TTY devices
  *
  * @magic: set to %TTY_DRIVER_MAGIC in __tty_alloc_driver()
  * @kref: reference counting. Reaching zero frees all the internals and the
  *    driver.
  * @cdevs: allocated/registered character /dev devices
  * @owner: modules owning this driver. Used drivers cannot be rmmod'ed.
  *     Automatically set by tty_alloc_driver().
  * @driver_name: name of the driver used in /proc/tty
  * @name: used for constructing /dev node name
  * @name_base: used as a number base for constructing /dev node name
  * @major: major /dev device number (zero for autoassignment)
  * @minor_start: the first minor /dev device number
  * @num: number of devices allocated
  * @type: type of tty driver (%TTY_DRIVER_TYPE_)
  * @subtype: subtype of tty driver (%SYSTEM_TYPE_, %PTY_TYPE_, %SERIAL_TYPE_)
  * @init_termios: termios to set to each tty initially (e.g. %tty_std_termios)
  * @flags: tty driver flags (%TTY_DRIVER_)
  * @proc_entry: proc fs entry, used internally
  * @other: driver of the linked tty; only used for the PTY driver
  * @ttys: array of active &struct tty_struct, set by tty_standard_install()
  * @ports: array of &struct tty_port; can be set during initialization by
  *     tty_port_link_device() and similar
  * @termios: storage for termios at each TTY close for the next open
  * @driver_state: pointer to driver's arbitrary data
  * @ops: driver hooks for TTYs. Set them using tty_set_operations(). Use &struct
  *   tty_port helpers in them as much as possible.
  * @tty_drivers: used internally to link tty_drivers together
  *
  * The usual handling of &struct tty_driver is to allocate it by
  * tty_alloc_driver(), set up all the necessary members, and register it by
  * tty_register_driver(). At last, the driver is torn down by calling
  * tty_unregister_driver() followed by tty_driver_kref_put().
  *
  * The fields required to be set before calling tty_register_driver() include
  * @driver_name, @name, @type, @subtype, @init_termios, and @ops.
  */
 struct tty_driver {
     int magic;
     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;
 }
 
 /* tty driver magic number */
 #define TTY_DRIVER_MAGIC        0x5402
 
 /**
  * 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 */

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