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437 lines
15 KiB
437 lines
15 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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/* |
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* This structure defines the interface between the low-level tty |
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* driver and the tty routines. The following routines can be |
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* defined; unless noted otherwise, they are optional, and can be |
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* filled in with a null pointer. |
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* |
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* struct tty_struct * (*lookup)(struct tty_driver *self, struct file *, 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 ttys array |
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* |
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* int (*install)(struct tty_driver *self, struct tty_struct *tty) |
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* |
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* Install a new tty into the tty driver 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 ttys array |
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* |
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* void (*remove)(struct tty_driver *self, struct tty_struct *tty) |
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* |
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* Remove a closed tty from the tty driver 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 ttys array |
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* |
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* int (*open)(struct tty_struct * tty, struct file * filp); |
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* |
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* This routine is called when a particular tty device is opened. |
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* This routine is mandatory; if this routine is not filled in, |
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* the attempted open will fail with ENODEV. |
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* |
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* Required method. Called with tty lock held. |
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* |
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* void (*close)(struct tty_struct * tty, struct file * filp); |
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* |
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* This routine is called when a particular tty device is closed. |
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* Note: called even if the corresponding open() failed. |
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* |
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* Required method. Called with tty lock held. |
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* |
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* void (*shutdown)(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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* void (*cleanup)(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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* |
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* int (*write)(struct tty_struct * tty, |
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* const unsigned char *buf, int count); |
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* |
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* This routine is called by the kernel to write a series of |
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* characters 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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* Optional: Required for writable devices. |
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* |
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* int (*put_char)(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 |
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* character to the tty device. If the kernel uses this routine, |
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* it must call the flush_chars() routine (if defined) when it is |
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* done stuffing characters into the driver. If there is no room |
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* in the queue, the character is ignored. |
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* |
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* Optional: Kernel will use the write method if not provided. |
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* |
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* Note: Do not call this function directly, call tty_put_char |
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* |
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* void (*flush_chars)(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: |
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* |
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* Note: Do not call this function directly, call tty_driver_flush_chars |
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* |
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* int (*write_room)(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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* Required if write method is provided else not needed. |
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* |
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* Note: Do not call this function directly, call tty_write_room |
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* |
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* int (*ioctl)(struct tty_struct *tty, unsigned int cmd, unsigned long arg); |
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* |
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* This routine allows the tty driver to implement |
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* device-specific ioctls. If the ioctl number passed in cmd |
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* is not recognized by the driver, it should return ENOIOCTLCMD. |
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* |
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* Optional |
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* |
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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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* |
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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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* void (*set_termios)(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 |
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* device's termios settings have changed. |
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* |
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* Optional: Called under the termios lock |
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* |
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* |
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* void (*set_ldisc)(struct tty_struct *tty); |
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* |
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* This routine allows the tty driver to be notified when the |
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* device's termios settings have changed. |
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* |
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* Optional: Called under BKL (currently) |
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* |
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* void (*throttle)(struct tty_struct * tty); |
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* |
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* This routine notifies the tty driver that input buffers for |
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* the line discipline are close to full, and it should somehow |
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* signal that no more characters should be sent to the tty. |
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* |
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* Optional: Always invoke via tty_throttle(), called under the |
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* termios lock. |
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* |
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* void (*unthrottle)(struct tty_struct * tty); |
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* |
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* This routine notifies the tty drivers that it should signals |
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* that characters can now be sent to the tty without fear of |
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* overrunning the 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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* termios lock. |
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* |
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* void (*stop)(struct tty_struct *tty); |
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* |
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* This routine notifies the tty driver that it should stop |
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* outputting characters to the tty device. |
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* |
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* Called with ->flow_lock held. Serialized with start() method. |
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* |
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* Optional: |
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* |
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* Note: Call stop_tty not this method. |
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* |
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* void (*start)(struct tty_struct *tty); |
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* |
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* This routine notifies the tty driver that it resume sending |
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* characters to the tty device. |
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* |
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* Called with ->flow_lock held. Serialized with stop() method. |
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* |
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* Optional: |
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* |
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* Note: Call start_tty not this method. |
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* |
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* void (*hangup)(struct tty_struct *tty); |
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* |
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* This routine notifies the tty driver that it should hang up the |
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* tty device. |
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* |
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* Optional: |
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* |
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* Called with tty lock held. |
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* |
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* int (*break_ctl)(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 |
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* off BREAK status on the RS-232 port. If state is -1, |
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* then the BREAK status should be turned on; if state is 0, then |
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* BREAK should be turned off. |
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* |
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* If this routine is implemented, the high-level tty driver will |
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* handle the following ioctls: TCSBRK, TCSBRKP, TIOCSBRK, |
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* TIOCCBRK. |
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* |
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* If the driver sets TTY_DRIVER_HARDWARE_BREAK then the interface |
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* will also be called with actual times and the hardware is expected |
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* to do the delay work itself. 0 and -1 are still used for on/off. |
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* |
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* Optional: Required for TCSBRK/BRKP/etc handling. |
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* |
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* void (*wait_until_sent)(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. |
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* |
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* Optional: If not provided the device is assumed to have no FIFO |
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* |
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* Note: Usually correct to call tty_wait_until_sent |
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* |
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* void (*send_xchar)(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 |
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* character to the 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 atomic write lock to keep it serialized with the ldisc. |
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* |
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* int (*resize)(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 |
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* requested terminal geometry. |
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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 (eg 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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* int (*get_icount)(struct tty_struct *tty, struct serial_icounter *icount); |
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* |
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* Called when the device receives a TIOCGICOUNT ioctl. Passed a kernel |
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* structure to complete. This method is optional and will only be called |
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* if provided (otherwise ENOTTY will be returned). |
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*/ |
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#include <linux/export.h> |
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#include <linux/fs.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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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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int (*write_room)(struct tty_struct *tty); |
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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 *, void *); |
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} __randomize_layout; |
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struct tty_driver { |
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int magic; /* magic number for this structure */ |
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struct kref kref; /* Reference management */ |
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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; /* offset of printed name */ |
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int major; /* major device number */ |
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int minor_start; /* start of minor device number */ |
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unsigned int num; /* number of devices allocated */ |
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short type; /* type of tty driver */ |
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short subtype; /* subtype of tty driver */ |
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struct ktermios init_termios; /* Initial termios */ |
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unsigned long flags; /* tty driver flags */ |
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struct proc_dir_entry *proc_entry; /* /proc fs entry */ |
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struct tty_driver *other; /* only used for the PTY driver */ |
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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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* 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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extern struct list_head tty_drivers; |
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extern struct tty_driver *__tty_alloc_driver(unsigned int lines, |
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struct module *owner, unsigned long flags); |
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extern void put_tty_driver(struct tty_driver *driver); |
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extern void tty_set_operations(struct tty_driver *driver, |
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const struct tty_operations *op); |
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extern struct tty_driver *tty_find_polling_driver(char *name, int *line); |
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extern void tty_driver_kref_put(struct tty_driver *driver); |
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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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* DEPRECATED Do not use this in new code, use tty_alloc_driver instead. |
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* (And change the return value checks.) |
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*/ |
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static inline struct tty_driver *alloc_tty_driver(unsigned int lines) |
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{ |
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struct tty_driver *ret = tty_alloc_driver(lines, 0); |
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if (IS_ERR(ret)) |
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return NULL; |
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return ret; |
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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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/* tty driver magic number */ |
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#define TTY_DRIVER_MAGIC 0x5402 |
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/* |
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* tty driver flags |
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* |
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* TTY_DRIVER_RESET_TERMIOS --- requests the tty layer to reset the |
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* termios setting when the last process has closed the device. |
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* Used for PTY's, in particular. |
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* |
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* TTY_DRIVER_REAL_RAW --- if set, indicates that the driver will |
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* guarantee never not to set any special character handling |
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* flags if ((IGNBRK || (!BRKINT && !PARMRK)) && (IGNPAR || |
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* !INPCK)). 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 |
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* line driver, it won't do so. This allows the line driver to |
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* optimize for this case if this flag is set. (Note that there |
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* is also a promise, if the above case is true, not to signal |
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* overruns, either.) |
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* |
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* TTY_DRIVER_DYNAMIC_DEV --- if set, the individual tty devices need |
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* to be registered with a call to tty_register_device() when the |
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* device is found in the system and unregistered with a call to |
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* tty_unregister_device() so the devices will be show up |
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* properly in sysfs. If not set, driver->num entries will be |
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* 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 |
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* that can appear and disappear while the main tty driver is |
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* registered with the tty core. |
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* |
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* TTY_DRIVER_DEVPTS_MEM -- don't use the standard arrays, instead |
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* use dynamic memory keyed through the devpts filesystem. This |
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* is only applicable to the pty driver. |
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* |
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* TTY_DRIVER_HARDWARE_BREAK -- hardware handles break signals. Pass |
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* the requested timeout to the caller instead of using a simple |
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* on/off interface. |
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* |
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* TTY_DRIVER_DYNAMIC_ALLOC -- do not allocate structures which are |
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* needed per line for this driver as it would waste memory. |
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* The driver will take care. |
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* |
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* TTY_DRIVER_UNNUMBERED_NODE -- do not create numbered /dev nodes. In |
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* other words create /dev/ttyprintk and not /dev/ttyprintk0. |
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* Applicable only when a driver for a single tty device is |
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* 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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/* 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) */ |
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#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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/* pty subtypes (magic, used by tty_io.c) */ |
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#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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#endif /* #ifdef _LINUX_TTY_DRIVER_H */
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