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590 lines
22 KiB
590 lines
22 KiB
/* 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/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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/** |
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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: ``int ()(struct tty_struct *tty, const unsigned char *buf, |
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* int 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, unsigned char 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, 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, char 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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int (*write)(struct tty_struct * tty, |
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const unsigned char *buf, int count); |
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int (*put_char)(struct tty_struct *tty, unsigned char 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, 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, char 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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* @magic: set to %TTY_DRIVER_MAGIC in __tty_alloc_driver() |
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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. |
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*/ |
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struct tty_driver { |
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int magic; |
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struct kref kref; |
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struct cdev **cdevs; |
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struct module *owner; |
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const char *driver_name; |
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const char *name; |
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int name_base; |
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int major; |
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int minor_start; |
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unsigned int num; |
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short type; |
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short subtype; |
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struct ktermios init_termios; |
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unsigned long flags; |
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struct proc_dir_entry *proc_entry; |
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struct tty_driver *other; |
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|
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/* |
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* Pointer to the tty data structures |
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*/ |
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struct tty_struct **ttys; |
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struct tty_port **ports; |
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struct ktermios **termios; |
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void *driver_state; |
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|
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/* |
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* Driver methods |
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*/ |
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const struct tty_operations *ops; |
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struct list_head tty_drivers; |
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} __randomize_layout; |
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|
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extern struct list_head tty_drivers; |
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struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner, |
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unsigned long flags); |
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struct tty_driver *tty_find_polling_driver(char *name, int *line); |
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void tty_driver_kref_put(struct tty_driver *driver); |
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|
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/* Use TTY_DRIVER_* flags below */ |
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#define tty_alloc_driver(lines, flags) \ |
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__tty_alloc_driver(lines, THIS_MODULE, flags) |
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|
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static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d) |
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{ |
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kref_get(&d->kref); |
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return d; |
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} |
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static inline void tty_set_operations(struct tty_driver *driver, |
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const struct tty_operations *op) |
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{ |
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driver->ops = op; |
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} |
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|
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/* tty driver magic number */ |
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#define TTY_DRIVER_MAGIC 0x5402 |
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|
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/** |
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* DOC: TTY Driver Flags |
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* |
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* TTY_DRIVER_RESET_TERMIOS |
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* Requests the tty layer to reset the termios setting when the last |
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* process has closed the device. Used for PTYs, in particular. |
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* |
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* TTY_DRIVER_REAL_RAW |
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* Indicates that the driver will guarantee not to set any special |
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* character handling flags if this is set for the tty: |
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* |
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* ``(IGNBRK || (!BRKINT && !PARMRK)) && (IGNPAR || !INPCK)`` |
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* |
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* That is, if there is no reason for the driver to |
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* send notifications of parity and break characters up to the line |
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* driver, it won't do so. This allows the line driver to optimize for |
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* this case if this flag is set. (Note that there is also a promise, if |
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* the above case is true, not to signal overruns, either.) |
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* |
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* TTY_DRIVER_DYNAMIC_DEV |
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* The individual tty devices need to be registered with a call to |
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* tty_register_device() when the device is found in the system and |
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* unregistered with a call to tty_unregister_device() so the devices will |
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* be show up properly in sysfs. If not set, all &tty_driver.num entries |
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* will be created by the tty core in sysfs when tty_register_driver() is |
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* called. This is to be used by drivers that have tty devices that can |
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* appear and disappear while the main tty driver is registered with the |
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* tty core. |
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* |
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* TTY_DRIVER_DEVPTS_MEM |
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* Don't use the standard arrays (&tty_driver.ttys and |
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* &tty_driver.termios), instead use dynamic memory keyed through the |
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* devpts filesystem. This is only applicable to the PTY driver. |
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* |
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* TTY_DRIVER_HARDWARE_BREAK |
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* Hardware handles break signals. Pass the requested timeout to the |
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* &tty_operations.break_ctl instead of using a simple on/off interface. |
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* |
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* TTY_DRIVER_DYNAMIC_ALLOC |
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* Do not allocate structures which are needed per line for this driver |
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* (&tty_driver.ports) as it would waste memory. The driver will take |
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* care. This is only applicable to the PTY driver. |
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* |
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* TTY_DRIVER_UNNUMBERED_NODE |
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* Do not create numbered ``/dev`` nodes. For example, create |
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* ``/dev/ttyprintk`` and not ``/dev/ttyprintk0``. Applicable only when a |
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* driver for a single tty device is being allocated. |
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*/ |
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#define TTY_DRIVER_INSTALLED 0x0001 |
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#define TTY_DRIVER_RESET_TERMIOS 0x0002 |
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#define TTY_DRIVER_REAL_RAW 0x0004 |
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#define TTY_DRIVER_DYNAMIC_DEV 0x0008 |
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#define TTY_DRIVER_DEVPTS_MEM 0x0010 |
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#define TTY_DRIVER_HARDWARE_BREAK 0x0020 |
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#define TTY_DRIVER_DYNAMIC_ALLOC 0x0040 |
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#define TTY_DRIVER_UNNUMBERED_NODE 0x0080 |
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|
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/* tty driver types */ |
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#define TTY_DRIVER_TYPE_SYSTEM 0x0001 |
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#define TTY_DRIVER_TYPE_CONSOLE 0x0002 |
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#define TTY_DRIVER_TYPE_SERIAL 0x0003 |
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#define TTY_DRIVER_TYPE_PTY 0x0004 |
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#define TTY_DRIVER_TYPE_SCC 0x0005 /* scc driver */ |
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#define TTY_DRIVER_TYPE_SYSCONS 0x0006 |
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|
|
/* system subtypes (magic, used by tty_io.c) */ |
|
#define SYSTEM_TYPE_TTY 0x0001 |
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#define SYSTEM_TYPE_CONSOLE 0x0002 |
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#define SYSTEM_TYPE_SYSCONS 0x0003 |
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#define SYSTEM_TYPE_SYSPTMX 0x0004 |
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|
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/* pty subtypes (magic, used by tty_io.c) */ |
|
#define PTY_TYPE_MASTER 0x0001 |
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#define PTY_TYPE_SLAVE 0x0002 |
|
|
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/* serial subtype definitions */ |
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#define SERIAL_TYPE_NORMAL 1 |
|
|
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int tty_register_driver(struct tty_driver *driver); |
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void tty_unregister_driver(struct tty_driver *driver); |
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struct device *tty_register_device(struct tty_driver *driver, unsigned index, |
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struct device *dev); |
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struct device *tty_register_device_attr(struct tty_driver *driver, |
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unsigned index, struct device *device, void *drvdata, |
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const struct attribute_group **attr_grp); |
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void tty_unregister_device(struct tty_driver *driver, unsigned index); |
|
|
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#ifdef CONFIG_PROC_FS |
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void proc_tty_register_driver(struct tty_driver *); |
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void proc_tty_unregister_driver(struct tty_driver *); |
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#else |
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static inline void proc_tty_register_driver(struct tty_driver *d) {} |
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static inline void proc_tty_unregister_driver(struct tty_driver *d) {} |
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#endif |
|
|
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#endif /* #ifdef _LINUX_TTY_DRIVER_H */
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