1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _LINUX_TTY_DRIVER_H |
3 | #define _LINUX_TTY_DRIVER_H |
4 | |
5 | #include <linux/export.h> |
6 | #include <linux/fs.h> |
7 | #include <linux/kref.h> |
8 | #include <linux/list.h> |
9 | #include <linux/cdev.h> |
10 | #include <linux/termios.h> |
11 | #include <linux/seq_file.h> |
12 | |
13 | struct tty_struct; |
14 | struct tty_driver; |
15 | struct serial_icounter_struct; |
16 | struct serial_struct; |
17 | |
18 | /** |
19 | * struct tty_operations -- interface between driver and tty |
20 | * |
21 | * @lookup: ``struct tty_struct *()(struct tty_driver *self, struct file *, |
22 | * int idx)`` |
23 | * |
24 | * Return the tty device corresponding to @idx, %NULL if there is not |
25 | * one currently in use and an %ERR_PTR value on error. Called under |
26 | * %tty_mutex (for now!) |
27 | * |
28 | * Optional method. Default behaviour is to use the @self->ttys array. |
29 | * |
30 | * @install: ``int ()(struct tty_driver *self, struct tty_struct *tty)`` |
31 | * |
32 | * Install a new @tty into the @self's internal tables. Used in |
33 | * conjunction with @lookup and @remove methods. |
34 | * |
35 | * Optional method. Default behaviour is to use the @self->ttys array. |
36 | * |
37 | * @remove: ``void ()(struct tty_driver *self, struct tty_struct *tty)`` |
38 | * |
39 | * Remove a closed @tty from the @self's internal tables. Used in |
40 | * conjunction with @lookup and @remove methods. |
41 | * |
42 | * Optional method. Default behaviour is to use the @self->ttys array. |
43 | * |
44 | * @open: ``int ()(struct tty_struct *tty, struct file *)`` |
45 | * |
46 | * This routine is called when a particular @tty device is opened. This |
47 | * routine is mandatory; if this routine is not filled in, the attempted |
48 | * open will fail with %ENODEV. |
49 | * |
50 | * Required method. Called with tty lock held. May sleep. |
51 | * |
52 | * @close: ``void ()(struct tty_struct *tty, struct file *)`` |
53 | * |
54 | * This routine is called when a particular @tty device is closed. At the |
55 | * point of return from this call the driver must make no further ldisc |
56 | * calls of any kind. |
57 | * |
58 | * Remark: called even if the corresponding @open() failed. |
59 | * |
60 | * Required method. Called with tty lock held. May sleep. |
61 | * |
62 | * @shutdown: ``void ()(struct tty_struct *tty)`` |
63 | * |
64 | * This routine is called under the tty lock when a particular @tty device |
65 | * is closed for the last time. It executes before the @tty resources |
66 | * are freed so may execute while another function holds a @tty kref. |
67 | * |
68 | * @cleanup: ``void ()(struct tty_struct *tty)`` |
69 | * |
70 | * This routine is called asynchronously when a particular @tty device |
71 | * is closed for the last time freeing up the resources. This is |
72 | * actually the second part of shutdown for routines that might sleep. |
73 | * |
74 | * @write: ``int ()(struct tty_struct *tty, const unsigned char *buf, |
75 | * int count)`` |
76 | * |
77 | * This routine is called by the kernel to write a series (@count) of |
78 | * characters (@buf) to the @tty device. The characters may come from |
79 | * user space or kernel space. This routine will return the |
80 | * number of characters actually accepted for writing. |
81 | * |
82 | * May occur in parallel in special cases. Because this includes panic |
83 | * paths drivers generally shouldn't try and do clever locking here. |
84 | * |
85 | * Optional: Required for writable devices. May not sleep. |
86 | * |
87 | * @put_char: ``int ()(struct tty_struct *tty, unsigned char ch)`` |
88 | * |
89 | * This routine is called by the kernel to write a single character @ch to |
90 | * the @tty device. If the kernel uses this routine, it must call the |
91 | * @flush_chars() routine (if defined) when it is done stuffing characters |
92 | * into the driver. If there is no room in the queue, the character is |
93 | * ignored. |
94 | * |
95 | * Optional: Kernel will use the @write method if not provided. Do not |
96 | * call this function directly, call tty_put_char(). |
97 | * |
98 | * @flush_chars: ``void ()(struct tty_struct *tty)`` |
99 | * |
100 | * This routine is called by the kernel after it has written a |
101 | * series of characters to the tty device using @put_char(). |
102 | * |
103 | * Optional. Do not call this function directly, call |
104 | * tty_driver_flush_chars(). |
105 | * |
106 | * @write_room: ``unsigned int ()(struct tty_struct *tty)`` |
107 | * |
108 | * This routine returns the numbers of characters the @tty driver |
109 | * will accept for queuing to be written. This number is subject |
110 | * to change as output buffers get emptied, or if the output flow |
111 | * control is acted. |
112 | * |
113 | * The ldisc is responsible for being intelligent about multi-threading of |
114 | * write_room/write calls |
115 | * |
116 | * Required if @write method is provided else not needed. Do not call this |
117 | * function directly, call tty_write_room() |
118 | * |
119 | * @chars_in_buffer: ``unsigned int ()(struct tty_struct *tty)`` |
120 | * |
121 | * This routine returns the number of characters in the device private |
122 | * output queue. Used in tty_wait_until_sent() and for poll() |
123 | * implementation. |
124 | * |
125 | * Optional: if not provided, it is assumed there is no queue on the |
126 | * device. Do not call this function directly, call tty_chars_in_buffer(). |
127 | * |
128 | * @ioctl: ``int ()(struct tty_struct *tty, unsigned int cmd, |
129 | * unsigned long arg)`` |
130 | * |
131 | * This routine allows the @tty driver to implement device-specific |
132 | * ioctls. If the ioctl number passed in @cmd is not recognized by the |
133 | * driver, it should return %ENOIOCTLCMD. |
134 | * |
135 | * Optional. |
136 | * |
137 | * @compat_ioctl: ``long ()(struct tty_struct *tty, unsigned int cmd, |
138 | * unsigned long arg)`` |
139 | * |
140 | * Implement ioctl processing for 32 bit process on 64 bit system. |
141 | * |
142 | * Optional. |
143 | * |
144 | * @set_termios: ``void ()(struct tty_struct *tty, struct ktermios *old)`` |
145 | * |
146 | * This routine allows the @tty driver to be notified when device's |
147 | * termios settings have changed. New settings are in @tty->termios. |
148 | * Previous settings are passed in the @old argument. |
149 | * |
150 | * The API is defined such that the driver should return the actual modes |
151 | * selected. This means that the driver is responsible for modifying any |
152 | * bits in @tty->termios it cannot fulfill to indicate the actual modes |
153 | * being used. |
154 | * |
155 | * Optional. Called under the @tty->termios_rwsem. May sleep. |
156 | * |
157 | * @set_ldisc: ``void ()(struct tty_struct *tty)`` |
158 | * |
159 | * This routine allows the @tty driver to be notified when the device's |
160 | * line discipline is being changed. At the point this is done the |
161 | * discipline is not yet usable. |
162 | * |
163 | * Optional. Called under the @tty->ldisc_sem and @tty->termios_rwsem. |
164 | * |
165 | * @throttle: ``void ()(struct tty_struct *tty)`` |
166 | * |
167 | * This routine notifies the @tty driver that input buffers for the line |
168 | * discipline are close to full, and it should somehow signal that no more |
169 | * characters should be sent to the @tty. |
170 | * |
171 | * Serialization including with @unthrottle() is the job of the ldisc |
172 | * layer. |
173 | * |
174 | * Optional: Always invoke via tty_throttle_safe(). Called under the |
175 | * @tty->termios_rwsem. |
176 | * |
177 | * @unthrottle: ``void ()(struct tty_struct *tty)`` |
178 | * |
179 | * This routine notifies the @tty driver that it should signal that |
180 | * characters can now be sent to the @tty without fear of overrunning the |
181 | * input buffers of the line disciplines. |
182 | * |
183 | * Optional. Always invoke via tty_unthrottle(). Called under the |
184 | * @tty->termios_rwsem. |
185 | * |
186 | * @stop: ``void ()(struct tty_struct *tty)`` |
187 | * |
188 | * This routine notifies the @tty driver that it should stop outputting |
189 | * characters to the tty device. |
190 | * |
191 | * Called with @tty->flow.lock held. Serialized with @start() method. |
192 | * |
193 | * Optional. Always invoke via stop_tty(). |
194 | * |
195 | * @start: ``void ()(struct tty_struct *tty)`` |
196 | * |
197 | * This routine notifies the @tty driver that it resumed sending |
198 | * characters to the @tty device. |
199 | * |
200 | * Called with @tty->flow.lock held. Serialized with stop() method. |
201 | * |
202 | * Optional. Always invoke via start_tty(). |
203 | * |
204 | * @hangup: ``void ()(struct tty_struct *tty)`` |
205 | * |
206 | * This routine notifies the @tty driver that it should hang up the @tty |
207 | * device. |
208 | * |
209 | * Optional. Called with tty lock held. |
210 | * |
211 | * @break_ctl: ``int ()(struct tty_struct *tty, int state)`` |
212 | * |
213 | * This optional routine requests the @tty driver to turn on or off BREAK |
214 | * status on the RS-232 port. If @state is -1, then the BREAK status |
215 | * should be turned on; if @state is 0, then BREAK should be turned off. |
216 | * |
217 | * If this routine is implemented, the high-level tty driver will handle |
218 | * the following ioctls: %TCSBRK, %TCSBRKP, %TIOCSBRK, %TIOCCBRK. |
219 | * |
220 | * If the driver sets %TTY_DRIVER_HARDWARE_BREAK in tty_alloc_driver(), |
221 | * then the interface will also be called with actual times and the |
222 | * hardware is expected to do the delay work itself. 0 and -1 are still |
223 | * used for on/off. |
224 | * |
225 | * Optional: Required for %TCSBRK/%BRKP/etc. handling. May sleep. |
226 | * |
227 | * @flush_buffer: ``void ()(struct tty_struct *tty)`` |
228 | * |
229 | * This routine discards device private output buffer. Invoked on close, |
230 | * hangup, to implement %TCOFLUSH ioctl and similar. |
231 | * |
232 | * Optional: if not provided, it is assumed there is no queue on the |
233 | * device. Do not call this function directly, call |
234 | * tty_driver_flush_buffer(). |
235 | * |
236 | * @wait_until_sent: ``void ()(struct tty_struct *tty, int timeout)`` |
237 | * |
238 | * This routine waits until the device has written out all of the |
239 | * characters in its transmitter FIFO. Or until @timeout (in jiffies) is |
240 | * reached. |
241 | * |
242 | * Optional: If not provided, the device is assumed to have no FIFO. |
243 | * Usually correct to invoke via tty_wait_until_sent(). May sleep. |
244 | * |
245 | * @send_xchar: ``void ()(struct tty_struct *tty, char ch)`` |
246 | * |
247 | * This routine is used to send a high-priority XON/XOFF character (@ch) |
248 | * to the @tty device. |
249 | * |
250 | * Optional: If not provided, then the @write method is called under |
251 | * the @tty->atomic_write_lock to keep it serialized with the ldisc. |
252 | * |
253 | * @tiocmget: ``int ()(struct tty_struct *tty)`` |
254 | * |
255 | * This routine is used to obtain the modem status bits from the @tty |
256 | * driver. |
257 | * |
258 | * Optional: If not provided, then %ENOTTY is returned from the %TIOCMGET |
259 | * ioctl. Do not call this function directly, call tty_tiocmget(). |
260 | * |
261 | * @tiocmset: ``int ()(struct tty_struct *tty, |
262 | * unsigned int set, unsigned int clear)`` |
263 | * |
264 | * This routine is used to set the modem status bits to the @tty driver. |
265 | * First, @clear bits should be cleared, then @set bits set. |
266 | * |
267 | * Optional: If not provided, then %ENOTTY is returned from the %TIOCMSET |
268 | * ioctl. Do not call this function directly, call tty_tiocmset(). |
269 | * |
270 | * @resize: ``int ()(struct tty_struct *tty, struct winsize *ws)`` |
271 | * |
272 | * Called when a termios request is issued which changes the requested |
273 | * terminal geometry to @ws. |
274 | * |
275 | * Optional: the default action is to update the termios structure |
276 | * without error. This is usually the correct behaviour. Drivers should |
277 | * not force errors here if they are not resizable objects (e.g. a serial |
278 | * line). See tty_do_resize() if you need to wrap the standard method |
279 | * in your own logic -- the usual case. |
280 | * |
281 | * @get_icount: ``int ()(struct tty_struct *tty, |
282 | * struct serial_icounter *icount)`` |
283 | * |
284 | * Called when the @tty device receives a %TIOCGICOUNT ioctl. Passed a |
285 | * kernel structure @icount to complete. |
286 | * |
287 | * Optional: called only if provided, otherwise %ENOTTY will be returned. |
288 | * |
289 | * @get_serial: ``int ()(struct tty_struct *tty, struct serial_struct *p)`` |
290 | * |
291 | * Called when the @tty device receives a %TIOCGSERIAL ioctl. Passed a |
292 | * kernel structure @p (&struct serial_struct) to complete. |
293 | * |
294 | * Optional: called only if provided, otherwise %ENOTTY will be returned. |
295 | * Do not call this function directly, call tty_tiocgserial(). |
296 | * |
297 | * @set_serial: ``int ()(struct tty_struct *tty, struct serial_struct *p)`` |
298 | * |
299 | * Called when the @tty device receives a %TIOCSSERIAL ioctl. Passed a |
300 | * kernel structure @p (&struct serial_struct) to set the values from. |
301 | * |
302 | * Optional: called only if provided, otherwise %ENOTTY will be returned. |
303 | * Do not call this function directly, call tty_tiocsserial(). |
304 | * |
305 | * @show_fdinfo: ``void ()(struct tty_struct *tty, struct seq_file *m)`` |
306 | * |
307 | * Called when the @tty device file descriptor receives a fdinfo request |
308 | * from VFS (to show in /proc/<pid>/fdinfo/). @m should be filled with |
309 | * information. |
310 | * |
311 | * Optional: called only if provided, otherwise nothing is written to @m. |
312 | * Do not call this function directly, call tty_show_fdinfo(). |
313 | * |
314 | * @poll_init: ``int ()(struct tty_driver *driver, int line, char *options)`` |
315 | * |
316 | * kgdboc support (Documentation/dev-tools/kgdb.rst). This routine is |
317 | * called to initialize the HW for later use by calling @poll_get_char or |
318 | * @poll_put_char. |
319 | * |
320 | * Optional: called only if provided, otherwise skipped as a non-polling |
321 | * driver. |
322 | * |
323 | * @poll_get_char: ``int ()(struct tty_driver *driver, int line)`` |
324 | * |
325 | * kgdboc support (see @poll_init). @driver should read a character from a |
326 | * tty identified by @line and return it. |
327 | * |
328 | * Optional: called only if @poll_init provided. |
329 | * |
330 | * @poll_put_char: ``void ()(struct tty_driver *driver, int line, char ch)`` |
331 | * |
332 | * kgdboc support (see @poll_init). @driver should write character @ch to |
333 | * a tty identified by @line. |
334 | * |
335 | * Optional: called only if @poll_init provided. |
336 | * |
337 | * @proc_show: ``int ()(struct seq_file *m, void *driver)`` |
338 | * |
339 | * Driver @driver (cast to &struct tty_driver) can show additional info in |
340 | * /proc/tty/driver/<driver_name>. It is enough to fill in the information |
341 | * into @m. |
342 | * |
343 | * Optional: called only if provided, otherwise no /proc entry created. |
344 | * |
345 | * This structure defines the interface between the low-level tty driver and |
346 | * the tty routines. These routines can be defined. Unless noted otherwise, |
347 | * they are optional, and can be filled in with a %NULL pointer. |
348 | */ |
349 | struct tty_operations { |
350 | struct tty_struct * (*lookup)(struct tty_driver *driver, |
351 | struct file *filp, int idx); |
352 | int (*install)(struct tty_driver *driver, struct tty_struct *tty); |
353 | void (*remove)(struct tty_driver *driver, struct tty_struct *tty); |
354 | int (*open)(struct tty_struct * tty, struct file * filp); |
355 | void (*close)(struct tty_struct * tty, struct file * filp); |
356 | void (*shutdown)(struct tty_struct *tty); |
357 | void (*cleanup)(struct tty_struct *tty); |
358 | int (*write)(struct tty_struct * tty, |
359 | const unsigned char *buf, int count); |
360 | int (*put_char)(struct tty_struct *tty, unsigned char ch); |
361 | void (*flush_chars)(struct tty_struct *tty); |
362 | unsigned int (*write_room)(struct tty_struct *tty); |
363 | unsigned int (*chars_in_buffer)(struct tty_struct *tty); |
364 | int (*ioctl)(struct tty_struct *tty, |
365 | unsigned int cmd, unsigned long arg); |
366 | long (*compat_ioctl)(struct tty_struct *tty, |
367 | unsigned int cmd, unsigned long arg); |
368 | void (*set_termios)(struct tty_struct *tty, struct ktermios * old); |
369 | void (*throttle)(struct tty_struct * tty); |
370 | void (*unthrottle)(struct tty_struct * tty); |
371 | void (*stop)(struct tty_struct *tty); |
372 | void (*start)(struct tty_struct *tty); |
373 | void (*hangup)(struct tty_struct *tty); |
374 | int (*break_ctl)(struct tty_struct *tty, int state); |
375 | void (*flush_buffer)(struct tty_struct *tty); |
376 | void (*set_ldisc)(struct tty_struct *tty); |
377 | void (*wait_until_sent)(struct tty_struct *tty, int timeout); |
378 | void (*send_xchar)(struct tty_struct *tty, char ch); |
379 | int (*tiocmget)(struct tty_struct *tty); |
380 | int (*tiocmset)(struct tty_struct *tty, |
381 | unsigned int set, unsigned int clear); |
382 | int (*resize)(struct tty_struct *tty, struct winsize *ws); |
383 | int (*get_icount)(struct tty_struct *tty, |
384 | struct serial_icounter_struct *icount); |
385 | int (*get_serial)(struct tty_struct *tty, struct serial_struct *p); |
386 | int (*set_serial)(struct tty_struct *tty, struct serial_struct *p); |
387 | void (*show_fdinfo)(struct tty_struct *tty, struct seq_file *m); |
388 | #ifdef CONFIG_CONSOLE_POLL |
389 | int (*poll_init)(struct tty_driver *driver, int line, char *options); |
390 | int (*poll_get_char)(struct tty_driver *driver, int line); |
391 | void (*poll_put_char)(struct tty_driver *driver, int line, char ch); |
392 | #endif |
393 | int (*proc_show)(struct seq_file *m, void *driver); |
394 | } __randomize_layout; |
395 | |
396 | /** |
397 | * struct tty_driver -- driver for TTY devices |
398 | * |
399 | * @magic: set to %TTY_DRIVER_MAGIC in __tty_alloc_driver() |
400 | * @kref: reference counting. Reaching zero frees all the internals and the |
401 | * driver. |
402 | * @cdevs: allocated/registered character /dev devices |
403 | * @owner: modules owning this driver. Used drivers cannot be rmmod'ed. |
404 | * Automatically set by tty_alloc_driver(). |
405 | * @driver_name: name of the driver used in /proc/tty |
406 | * @name: used for constructing /dev node name |
407 | * @name_base: used as a number base for constructing /dev node name |
408 | * @major: major /dev device number (zero for autoassignment) |
409 | * @minor_start: the first minor /dev device number |
410 | * @num: number of devices allocated |
411 | * @type: type of tty driver (%TTY_DRIVER_TYPE_) |
412 | * @subtype: subtype of tty driver (%SYSTEM_TYPE_, %PTY_TYPE_, %SERIAL_TYPE_) |
413 | * @init_termios: termios to set to each tty initially (e.g. %tty_std_termios) |
414 | * @flags: tty driver flags (%TTY_DRIVER_) |
415 | * @proc_entry: proc fs entry, used internally |
416 | * @other: driver of the linked tty; only used for the PTY driver |
417 | * @ttys: array of active &struct tty_struct, set by tty_standard_install() |
418 | * @ports: array of &struct tty_port; can be set during initialization by |
419 | * tty_port_link_device() and similar |
420 | * @termios: storage for termios at each TTY close for the next open |
421 | * @driver_state: pointer to driver's arbitrary data |
422 | * @ops: driver hooks for TTYs. Set them using tty_set_operations(). Use &struct |
423 | * tty_port helpers in them as much as possible. |
424 | * @tty_drivers: used internally to link tty_drivers together |
425 | * |
426 | * The usual handling of &struct tty_driver is to allocate it by |
427 | * tty_alloc_driver(), set up all the necessary members, and register it by |
428 | * tty_register_driver(). At last, the driver is torn down by calling |
429 | * tty_unregister_driver() followed by tty_driver_kref_put(). |
430 | * |
431 | * The fields required to be set before calling tty_register_driver() include |
432 | * @driver_name, @name, @type, @subtype, @init_termios, and @ops. |
433 | */ |
434 | struct tty_driver { |
435 | int magic; |
436 | struct kref kref; |
437 | struct cdev **cdevs; |
438 | struct module *owner; |
439 | const char *driver_name; |
440 | const char *name; |
441 | int name_base; |
442 | int major; |
443 | int minor_start; |
444 | unsigned int num; |
445 | short type; |
446 | short subtype; |
447 | struct ktermios init_termios; |
448 | unsigned long flags; |
449 | struct proc_dir_entry *proc_entry; |
450 | struct tty_driver *other; |
451 | |
452 | /* |
453 | * Pointer to the tty data structures |
454 | */ |
455 | struct tty_struct **ttys; |
456 | struct tty_port **ports; |
457 | struct ktermios **termios; |
458 | void *driver_state; |
459 | |
460 | /* |
461 | * Driver methods |
462 | */ |
463 | |
464 | const struct tty_operations *ops; |
465 | struct list_head tty_drivers; |
466 | } __randomize_layout; |
467 | |
468 | extern struct list_head tty_drivers; |
469 | |
470 | struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner, |
471 | unsigned long flags); |
472 | struct tty_driver *tty_find_polling_driver(char *name, int *line); |
473 | |
474 | void tty_driver_kref_put(struct tty_driver *driver); |
475 | |
476 | /* Use TTY_DRIVER_* flags below */ |
477 | #define tty_alloc_driver(lines, flags) \ |
478 | __tty_alloc_driver(lines, THIS_MODULE, flags) |
479 | |
480 | static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d) |
481 | { |
482 | kref_get(&d->kref); |
483 | return d; |
484 | } |
485 | |
486 | static inline void tty_set_operations(struct tty_driver *driver, |
487 | const struct tty_operations *op) |
488 | { |
489 | driver->ops = op; |
490 | } |
491 | |
492 | /* tty driver magic number */ |
493 | #define TTY_DRIVER_MAGIC 0x5402 |
494 | |
495 | /** |
496 | * DOC: TTY Driver Flags |
497 | * |
498 | * TTY_DRIVER_RESET_TERMIOS |
499 | * Requests the tty layer to reset the termios setting when the last |
500 | * process has closed the device. Used for PTYs, in particular. |
501 | * |
502 | * TTY_DRIVER_REAL_RAW |
503 | * Indicates that the driver will guarantee not to set any special |
504 | * character handling flags if this is set for the tty: |
505 | * |
506 | * ``(IGNBRK || (!BRKINT && !PARMRK)) && (IGNPAR || !INPCK)`` |
507 | * |
508 | * That is, if there is no reason for the driver to |
509 | * send notifications of parity and break characters up to the line |
510 | * driver, it won't do so. This allows the line driver to optimize for |
511 | * this case if this flag is set. (Note that there is also a promise, if |
512 | * the above case is true, not to signal overruns, either.) |
513 | * |
514 | * TTY_DRIVER_DYNAMIC_DEV |
515 | * The individual tty devices need to be registered with a call to |
516 | * tty_register_device() when the device is found in the system and |
517 | * unregistered with a call to tty_unregister_device() so the devices will |
518 | * be show up properly in sysfs. If not set, all &tty_driver.num entries |
519 | * will be created by the tty core in sysfs when tty_register_driver() is |
520 | * called. This is to be used by drivers that have tty devices that can |
521 | * appear and disappear while the main tty driver is registered with the |
522 | * tty core. |
523 | * |
524 | * TTY_DRIVER_DEVPTS_MEM |
525 | * Don't use the standard arrays (&tty_driver.ttys and |
526 | * &tty_driver.termios), instead use dynamic memory keyed through the |
527 | * devpts filesystem. This is only applicable to the PTY driver. |
528 | * |
529 | * TTY_DRIVER_HARDWARE_BREAK |
530 | * Hardware handles break signals. Pass the requested timeout to the |
531 | * &tty_operations.break_ctl instead of using a simple on/off interface. |
532 | * |
533 | * TTY_DRIVER_DYNAMIC_ALLOC |
534 | * Do not allocate structures which are needed per line for this driver |
535 | * (&tty_driver.ports) as it would waste memory. The driver will take |
536 | * care. This is only applicable to the PTY driver. |
537 | * |
538 | * TTY_DRIVER_UNNUMBERED_NODE |
539 | * Do not create numbered ``/dev`` nodes. For example, create |
540 | * ``/dev/ttyprintk`` and not ``/dev/ttyprintk0``. Applicable only when a |
541 | * driver for a single tty device is being allocated. |
542 | */ |
543 | #define TTY_DRIVER_INSTALLED 0x0001 |
544 | #define TTY_DRIVER_RESET_TERMIOS 0x0002 |
545 | #define TTY_DRIVER_REAL_RAW 0x0004 |
546 | #define TTY_DRIVER_DYNAMIC_DEV 0x0008 |
547 | #define TTY_DRIVER_DEVPTS_MEM 0x0010 |
548 | #define TTY_DRIVER_HARDWARE_BREAK 0x0020 |
549 | #define TTY_DRIVER_DYNAMIC_ALLOC 0x0040 |
550 | #define TTY_DRIVER_UNNUMBERED_NODE 0x0080 |
551 | |
552 | /* tty driver types */ |
553 | #define TTY_DRIVER_TYPE_SYSTEM 0x0001 |
554 | #define TTY_DRIVER_TYPE_CONSOLE 0x0002 |
555 | #define TTY_DRIVER_TYPE_SERIAL 0x0003 |
556 | #define TTY_DRIVER_TYPE_PTY 0x0004 |
557 | #define TTY_DRIVER_TYPE_SCC 0x0005 /* scc driver */ |
558 | #define TTY_DRIVER_TYPE_SYSCONS 0x0006 |
559 | |
560 | /* system subtypes (magic, used by tty_io.c) */ |
561 | #define SYSTEM_TYPE_TTY 0x0001 |
562 | #define SYSTEM_TYPE_CONSOLE 0x0002 |
563 | #define SYSTEM_TYPE_SYSCONS 0x0003 |
564 | #define SYSTEM_TYPE_SYSPTMX 0x0004 |
565 | |
566 | /* pty subtypes (magic, used by tty_io.c) */ |
567 | #define PTY_TYPE_MASTER 0x0001 |
568 | #define PTY_TYPE_SLAVE 0x0002 |
569 | |
570 | /* serial subtype definitions */ |
571 | #define SERIAL_TYPE_NORMAL 1 |
572 | |
573 | int tty_register_driver(struct tty_driver *driver); |
574 | void tty_unregister_driver(struct tty_driver *driver); |
575 | struct device *tty_register_device(struct tty_driver *driver, unsigned index, |
576 | struct device *dev); |
577 | struct device *tty_register_device_attr(struct tty_driver *driver, |
578 | unsigned index, struct device *device, void *drvdata, |
579 | const struct attribute_group **attr_grp); |
580 | void tty_unregister_device(struct tty_driver *driver, unsigned index); |
581 | |
582 | #ifdef CONFIG_PROC_FS |
583 | void proc_tty_register_driver(struct tty_driver *); |
584 | void proc_tty_unregister_driver(struct tty_driver *); |
585 | #else |
586 | static inline void proc_tty_register_driver(struct tty_driver *d) {} |
587 | static inline void proc_tty_unregister_driver(struct tty_driver *d) {} |
588 | #endif |
589 | |
590 | #endif /* #ifdef _LINUX_TTY_DRIVER_H */ |
591 | |