blob: 6bd5f8866c74b2ed85526a7ffe6465b370d7ce4c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/char/tty_ioctl.c
3 *
4 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
5 *
6 * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
7 * which can be dynamically activated and de-activated by the line
8 * discipline handling modules (like SLIP).
9 */
10
11#include <linux/types.h>
12#include <linux/termios.h>
13#include <linux/errno.h>
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/major.h>
17#include <linux/tty.h>
18#include <linux/fcntl.h>
19#include <linux/string.h>
20#include <linux/mm.h>
21#include <linux/module.h>
22#include <linux/bitops.h>
Arjan van de Ven5785c952006-09-29 02:00:43 -070023#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#include <asm/io.h>
26#include <asm/uaccess.h>
27#include <asm/system.h>
28
29#undef TTY_DEBUG_WAIT_UNTIL_SENT
30
31#undef DEBUG
32
33/*
34 * Internal flag options for termios setting behavior
35 */
36#define TERMIOS_FLUSH 1
37#define TERMIOS_WAIT 2
38#define TERMIOS_TERMIO 4
Alan Coxedc6afc2006-12-08 02:38:44 -080039#define TERMIOS_OLD 8
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Alan Coxaf9b8972006-08-27 01:24:01 -070041
Alan Coxd81ed102008-10-13 10:41:42 +010042/**
43 * tty_chars_in_buffer - characters pending
44 * @tty: terminal
45 *
46 * Return the number of bytes of data in the device private
47 * output queue. If no private method is supplied there is assumed
48 * to be no queue on the device.
49 */
50
Alan Coxf34d7a52008-04-30 00:54:13 -070051int tty_chars_in_buffer(struct tty_struct *tty)
52{
53 if (tty->ops->chars_in_buffer)
54 return tty->ops->chars_in_buffer(tty);
55 else
56 return 0;
57}
Alan Coxf34d7a52008-04-30 00:54:13 -070058EXPORT_SYMBOL(tty_chars_in_buffer);
59
Alan Coxd81ed102008-10-13 10:41:42 +010060/**
61 * tty_write_room - write queue space
62 * @tty: terminal
63 *
64 * Return the number of bytes that can be queued to this device
65 * at the present time. The result should be treated as a guarantee
66 * and the driver cannot offer a value it later shrinks by more than
67 * the number of bytes written. If no method is provided 2K is always
68 * returned and data may be lost as there will be no flow control.
69 */
70
Alan Coxf34d7a52008-04-30 00:54:13 -070071int tty_write_room(struct tty_struct *tty)
72{
73 if (tty->ops->write_room)
74 return tty->ops->write_room(tty);
75 return 2048;
76}
Alan Coxf34d7a52008-04-30 00:54:13 -070077EXPORT_SYMBOL(tty_write_room);
78
Alan Coxd81ed102008-10-13 10:41:42 +010079/**
80 * tty_driver_flush_buffer - discard internal buffer
81 * @tty: terminal
82 *
83 * Discard the internal output buffer for this device. If no method
84 * is provided then either the buffer cannot be hardware flushed or
85 * there is no buffer driver side.
86 */
Alan Coxf34d7a52008-04-30 00:54:13 -070087void tty_driver_flush_buffer(struct tty_struct *tty)
88{
89 if (tty->ops->flush_buffer)
90 tty->ops->flush_buffer(tty);
91}
Alan Coxf34d7a52008-04-30 00:54:13 -070092EXPORT_SYMBOL(tty_driver_flush_buffer);
93
Alan Coxd81ed102008-10-13 10:41:42 +010094/**
95 * tty_throttle - flow control
96 * @tty: terminal
97 *
98 * Indicate that a tty should stop transmitting data down the stack.
Alan Cox38db8972009-06-11 12:44:17 +010099 * Takes the termios mutex to protect against parallel throttle/unthrottle
100 * and also to ensure the driver can consistently reference its own
101 * termios data at this point when implementing software flow control.
Alan Coxd81ed102008-10-13 10:41:42 +0100102 */
103
Alan Cox39c2e602008-04-30 00:54:18 -0700104void tty_throttle(struct tty_struct *tty)
105{
Alan Cox38db8972009-06-11 12:44:17 +0100106 mutex_lock(&tty->termios_mutex);
Alan Cox39c2e602008-04-30 00:54:18 -0700107 /* check TTY_THROTTLED first so it indicates our state */
108 if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
109 tty->ops->throttle)
110 tty->ops->throttle(tty);
Alan Cox38db8972009-06-11 12:44:17 +0100111 mutex_unlock(&tty->termios_mutex);
Alan Cox39c2e602008-04-30 00:54:18 -0700112}
113EXPORT_SYMBOL(tty_throttle);
114
Alan Coxd81ed102008-10-13 10:41:42 +0100115/**
116 * tty_unthrottle - flow control
117 * @tty: terminal
118 *
119 * Indicate that a tty may continue transmitting data down the stack.
Alan Cox38db8972009-06-11 12:44:17 +0100120 * Takes the termios mutex to protect against parallel throttle/unthrottle
121 * and also to ensure the driver can consistently reference its own
122 * termios data at this point when implementing software flow control.
123 *
124 * Drivers should however remember that the stack can issue a throttle,
125 * then change flow control method, then unthrottle.
Alan Coxd81ed102008-10-13 10:41:42 +0100126 */
127
Alan Cox39c2e602008-04-30 00:54:18 -0700128void tty_unthrottle(struct tty_struct *tty)
129{
Alan Cox38db8972009-06-11 12:44:17 +0100130 mutex_lock(&tty->termios_mutex);
Alan Cox39c2e602008-04-30 00:54:18 -0700131 if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
132 tty->ops->unthrottle)
133 tty->ops->unthrottle(tty);
Alan Cox38db8972009-06-11 12:44:17 +0100134 mutex_unlock(&tty->termios_mutex);
Alan Cox39c2e602008-04-30 00:54:18 -0700135}
136EXPORT_SYMBOL(tty_unthrottle);
Alan Coxf34d7a52008-04-30 00:54:13 -0700137
Alan Coxaf9b8972006-08-27 01:24:01 -0700138/**
139 * tty_wait_until_sent - wait for I/O to finish
140 * @tty: tty we are waiting for
141 * @timeout: how long we will wait
142 *
143 * Wait for characters pending in a tty driver to hit the wire, or
144 * for a timeout to occur (eg due to flow control)
145 *
146 * Locking: none
147 */
148
Alan Cox355d95a2008-02-08 04:18:48 -0800149void tty_wait_until_sent(struct tty_struct *tty, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
152 char buf[64];
Alan Cox355d95a2008-02-08 04:18:48 -0800153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
155#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 if (!timeout)
157 timeout = MAX_SCHEDULE_TIMEOUT;
Jiri Slaby5a52bd42007-07-15 23:40:18 -0700158 if (wait_event_interruptible_timeout(tty->write_wait,
Alan Coxf34d7a52008-04-30 00:54:13 -0700159 !tty_chars_in_buffer(tty), timeout) >= 0) {
160 if (tty->ops->wait_until_sent)
161 tty->ops->wait_until_sent(tty, timeout);
Alan Cox0ee9cbb2008-04-30 00:53:32 -0700162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164EXPORT_SYMBOL(tty_wait_until_sent);
165
Alan Coxd81ed102008-10-13 10:41:42 +0100166
167/*
168 * Termios Helper Methods
169 */
170
Alan Coxedc6afc2006-12-08 02:38:44 -0800171static void unset_locked_termios(struct ktermios *termios,
172 struct ktermios *old,
173 struct ktermios *locked)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
175 int i;
Alan Cox355d95a2008-02-08 04:18:48 -0800176
177#define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 if (!locked) {
180 printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
181 return;
182 }
183
184 NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
185 NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
186 NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
187 NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
188 termios->c_line = locked->c_line ? old->c_line : termios->c_line;
Alan Cox355d95a2008-02-08 04:18:48 -0800189 for (i = 0; i < NCCS; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 termios->c_cc[i] = locked->c_cc[i] ?
191 old->c_cc[i] : termios->c_cc[i];
Alan Coxedc6afc2006-12-08 02:38:44 -0800192 /* FIXME: What should we do for i/ospeed */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Alan Coxedc6afc2006-12-08 02:38:44 -0800195/*
196 * Routine which returns the baud rate of the tty
197 *
198 * Note that the baud_table needs to be kept in sync with the
199 * include/asm/termbits.h file.
200 */
201static const speed_t baud_table[] = {
202 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
203 9600, 19200, 38400, 57600, 115200, 230400, 460800,
204#ifdef __sparc__
205 76800, 153600, 307200, 614400, 921600
206#else
207 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
208 2500000, 3000000, 3500000, 4000000
209#endif
210};
211
212#ifndef __sparc__
213static const tcflag_t baud_bits[] = {
214 B0, B50, B75, B110, B134, B150, B200, B300, B600,
215 B1200, B1800, B2400, B4800, B9600, B19200, B38400,
216 B57600, B115200, B230400, B460800, B500000, B576000,
217 B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
218 B3000000, B3500000, B4000000
219};
220#else
221static const tcflag_t baud_bits[] = {
222 B0, B50, B75, B110, B134, B150, B200, B300, B600,
223 B1200, B1800, B2400, B4800, B9600, B19200, B38400,
224 B57600, B115200, B230400, B460800, B76800, B153600,
225 B307200, B614400, B921600
226};
227#endif
228
229static int n_baud_table = ARRAY_SIZE(baud_table);
230
231/**
232 * tty_termios_baud_rate
233 * @termios: termios structure
234 *
235 * Convert termios baud rate data into a speed. This should be called
236 * with the termios lock held if this termios is a terminal termios
237 * structure. May change the termios data. Device drivers can call this
238 * function but should use ->c_[io]speed directly as they are updated.
239 *
240 * Locking: none
241 */
242
243speed_t tty_termios_baud_rate(struct ktermios *termios)
244{
245 unsigned int cbaud;
246
247 cbaud = termios->c_cflag & CBAUD;
248
249#ifdef BOTHER
250 /* Magic token for arbitary speed via c_ispeed/c_ospeed */
251 if (cbaud == BOTHER)
252 return termios->c_ospeed;
253#endif
254 if (cbaud & CBAUDEX) {
255 cbaud &= ~CBAUDEX;
256
257 if (cbaud < 1 || cbaud + 15 > n_baud_table)
258 termios->c_cflag &= ~CBAUDEX;
259 else
260 cbaud += 15;
261 }
262 return baud_table[cbaud];
263}
Alan Coxedc6afc2006-12-08 02:38:44 -0800264EXPORT_SYMBOL(tty_termios_baud_rate);
265
266/**
267 * tty_termios_input_baud_rate
268 * @termios: termios structure
269 *
270 * Convert termios baud rate data into a speed. This should be called
271 * with the termios lock held if this termios is a terminal termios
272 * structure. May change the termios data. Device drivers can call this
273 * function but should use ->c_[io]speed directly as they are updated.
274 *
275 * Locking: none
276 */
277
278speed_t tty_termios_input_baud_rate(struct ktermios *termios)
279{
280#ifdef IBSHIFT
281 unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
282
283 if (cbaud == B0)
284 return tty_termios_baud_rate(termios);
285
286 /* Magic token for arbitary speed via c_ispeed*/
287 if (cbaud == BOTHER)
288 return termios->c_ispeed;
289
290 if (cbaud & CBAUDEX) {
291 cbaud &= ~CBAUDEX;
292
293 if (cbaud < 1 || cbaud + 15 > n_baud_table)
294 termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
295 else
296 cbaud += 15;
297 }
298 return baud_table[cbaud];
299#else
300 return tty_termios_baud_rate(termios);
301#endif
302}
Alan Coxedc6afc2006-12-08 02:38:44 -0800303EXPORT_SYMBOL(tty_termios_input_baud_rate);
304
Alan Coxedc6afc2006-12-08 02:38:44 -0800305/**
306 * tty_termios_encode_baud_rate
Alan Cox78137e32007-02-10 01:45:57 -0800307 * @termios: ktermios structure holding user requested state
Alan Coxedc6afc2006-12-08 02:38:44 -0800308 * @ispeed: input speed
309 * @ospeed: output speed
310 *
311 * Encode the speeds set into the passed termios structure. This is
312 * used as a library helper for drivers os that they can report back
313 * the actual speed selected when it differs from the speed requested
314 *
Alan Cox78137e32007-02-10 01:45:57 -0800315 * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour
316 * we need to carefully set the bits when the user does not get the
317 * desired speed. We allow small margins and preserve as much of possible
Dirk Hohndel06fe9fb2009-09-28 21:43:57 -0400318 * of the input intent to keep compatibility.
Alan Coxedc6afc2006-12-08 02:38:44 -0800319 *
320 * Locking: Caller should hold termios lock. This is already held
321 * when calling this function from the driver termios handler.
Alan Cox5f519d72007-10-16 23:30:07 -0700322 *
323 * The ifdefs deal with platforms whose owners have yet to update them
324 * and will all go away once this is done.
Alan Coxedc6afc2006-12-08 02:38:44 -0800325 */
326
Maciej W. Rozycki75e8b712007-10-18 03:04:35 -0700327void tty_termios_encode_baud_rate(struct ktermios *termios,
328 speed_t ibaud, speed_t obaud)
Alan Coxedc6afc2006-12-08 02:38:44 -0800329{
330 int i = 0;
Alan Cox78137e32007-02-10 01:45:57 -0800331 int ifound = -1, ofound = -1;
332 int iclose = ibaud/50, oclose = obaud/50;
333 int ibinput = 0;
Alan Coxedc6afc2006-12-08 02:38:44 -0800334
Alan Cox5f519d72007-10-16 23:30:07 -0700335 if (obaud == 0) /* CD dropped */
336 ibaud = 0; /* Clear ibaud to be sure */
337
Alan Coxedc6afc2006-12-08 02:38:44 -0800338 termios->c_ispeed = ibaud;
339 termios->c_ospeed = obaud;
340
Alan Cox5f519d72007-10-16 23:30:07 -0700341#ifdef BOTHER
Alan Cox78137e32007-02-10 01:45:57 -0800342 /* If the user asked for a precise weird speed give a precise weird
343 answer. If they asked for a Bfoo speed they many have problems
344 digesting non-exact replies so fuzz a bit */
345
346 if ((termios->c_cflag & CBAUD) == BOTHER)
347 oclose = 0;
348 if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)
349 iclose = 0;
350 if ((termios->c_cflag >> IBSHIFT) & CBAUD)
351 ibinput = 1; /* An input speed was specified */
Alan Cox5f519d72007-10-16 23:30:07 -0700352#endif
Alan Coxedc6afc2006-12-08 02:38:44 -0800353 termios->c_cflag &= ~CBAUD;
Alan Coxedc6afc2006-12-08 02:38:44 -0800354
Alan Cox5f519d72007-10-16 23:30:07 -0700355 /*
356 * Our goal is to find a close match to the standard baud rate
357 * returned. Walk the baud rate table and if we get a very close
358 * match then report back the speed as a POSIX Bxxxx value by
359 * preference
360 */
361
Alan Coxedc6afc2006-12-08 02:38:44 -0800362 do {
Maciej W. Rozycki75e8b712007-10-18 03:04:35 -0700363 if (obaud - oclose <= baud_table[i] &&
364 obaud + oclose >= baud_table[i]) {
Alan Coxedc6afc2006-12-08 02:38:44 -0800365 termios->c_cflag |= baud_bits[i];
Alan Cox78137e32007-02-10 01:45:57 -0800366 ofound = i;
Alan Coxedc6afc2006-12-08 02:38:44 -0800367 }
Maciej W. Rozycki75e8b712007-10-18 03:04:35 -0700368 if (ibaud - iclose <= baud_table[i] &&
369 ibaud + iclose >= baud_table[i]) {
370 /* For the case input == output don't set IBAUD bits
371 if the user didn't do so */
Alan Cox5f519d72007-10-16 23:30:07 -0700372 if (ofound == i && !ibinput)
373 ifound = i;
374#ifdef IBSHIFT
375 else {
376 ifound = i;
Alan Cox78137e32007-02-10 01:45:57 -0800377 termios->c_cflag |= (baud_bits[i] << IBSHIFT);
Alan Cox5f519d72007-10-16 23:30:07 -0700378 }
379#endif
Alan Coxedc6afc2006-12-08 02:38:44 -0800380 }
Jiri Slaby68043962007-07-15 23:40:18 -0700381 } while (++i < n_baud_table);
Alan Cox5f519d72007-10-16 23:30:07 -0700382
383 /*
384 * If we found no match then use BOTHER if provided or warn
385 * the user their platform maintainer needs to wake up if not.
386 */
387#ifdef BOTHER
Alan Cox78137e32007-02-10 01:45:57 -0800388 if (ofound == -1)
Alan Coxedc6afc2006-12-08 02:38:44 -0800389 termios->c_cflag |= BOTHER;
Alan Cox78137e32007-02-10 01:45:57 -0800390 /* Set exact input bits only if the input and output differ or the
391 user already did */
Jiri Slaby68043962007-07-15 23:40:18 -0700392 if (ifound == -1 && (ibaud != obaud || ibinput))
Alan Coxedc6afc2006-12-08 02:38:44 -0800393 termios->c_cflag |= (BOTHER << IBSHIFT);
Alan Cox5f519d72007-10-16 23:30:07 -0700394#else
395 if (ifound == -1 || ofound == -1) {
Marcin Slusarz9074d962009-08-09 21:54:03 +0200396 printk_once(KERN_WARNING "tty: Unable to return correct "
Alan Cox5f519d72007-10-16 23:30:07 -0700397 "speed data as your architecture needs updating.\n");
398 }
399#endif
Alan Coxedc6afc2006-12-08 02:38:44 -0800400}
Alan Coxedc6afc2006-12-08 02:38:44 -0800401EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
402
Alan Coxd81ed102008-10-13 10:41:42 +0100403/**
404 * tty_encode_baud_rate - set baud rate of the tty
405 * @ibaud: input baud rate
406 * @obad: output baud rate
407 *
408 * Update the current termios data for the tty with the new speed
409 * settings. The caller must hold the termios_mutex for the tty in
410 * question.
411 */
412
Alan Cox5f519d72007-10-16 23:30:07 -0700413void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)
414{
415 tty_termios_encode_baud_rate(tty->termios, ibaud, obaud);
416}
417EXPORT_SYMBOL_GPL(tty_encode_baud_rate);
Alan Coxedc6afc2006-12-08 02:38:44 -0800418
419/**
420 * tty_get_baud_rate - get tty bit rates
421 * @tty: tty to query
422 *
423 * Returns the baud rate as an integer for this terminal. The
424 * termios lock must be held by the caller and the terminal bit
425 * flags may be updated.
426 *
427 * Locking: none
428 */
429
430speed_t tty_get_baud_rate(struct tty_struct *tty)
431{
432 speed_t baud = tty_termios_baud_rate(tty->termios);
433
434 if (baud == 38400 && tty->alt_speed) {
435 if (!tty->warned) {
436 printk(KERN_WARNING "Use of setserial/setrocket to "
437 "set SPD_* flags is deprecated\n");
438 tty->warned = 1;
439 }
440 baud = tty->alt_speed;
441 }
442
443 return baud;
444}
Alan Coxedc6afc2006-12-08 02:38:44 -0800445EXPORT_SYMBOL(tty_get_baud_rate);
446
Alan Coxaf9b8972006-08-27 01:24:01 -0700447/**
Alan Cox5f519d72007-10-16 23:30:07 -0700448 * tty_termios_copy_hw - copy hardware settings
449 * @new: New termios
450 * @old: Old termios
451 *
452 * Propogate the hardware specific terminal setting bits from
453 * the old termios structure to the new one. This is used in cases
454 * where the hardware does not support reconfiguration or as a helper
455 * in some cases where only minimal reconfiguration is supported
456 */
457
458void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old)
459{
460 /* The bits a dumb device handles in software. Smart devices need
461 to always provide a set_termios method */
462 new->c_cflag &= HUPCL | CREAD | CLOCAL;
463 new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL);
464 new->c_ispeed = old->c_ispeed;
465 new->c_ospeed = old->c_ospeed;
466}
Alan Cox5f519d72007-10-16 23:30:07 -0700467EXPORT_SYMBOL(tty_termios_copy_hw);
468
469/**
Alan Coxbf5e5832008-01-08 14:55:51 +0000470 * tty_termios_hw_change - check for setting change
471 * @a: termios
472 * @b: termios to compare
473 *
474 * Check if any of the bits that affect a dumb device have changed
475 * between the two termios structures, or a speed change is needed.
476 */
477
478int tty_termios_hw_change(struct ktermios *a, struct ktermios *b)
479{
480 if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
481 return 1;
482 if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL))
483 return 1;
484 return 0;
485}
486EXPORT_SYMBOL(tty_termios_hw_change);
487
488/**
Alan Coxaf9b8972006-08-27 01:24:01 -0700489 * change_termios - update termios values
490 * @tty: tty to update
491 * @new_termios: desired new value
492 *
493 * Perform updates to the termios values set on this terminal. There
494 * is a bit of layering violation here with n_tty in terms of the
495 * internal knowledge of this function.
496 *
Alan Coxd81ed102008-10-13 10:41:42 +0100497 * Locking: termios_mutex
Alan Coxaf9b8972006-08-27 01:24:01 -0700498 */
499
Alan Cox355d95a2008-02-08 04:18:48 -0800500static void change_termios(struct tty_struct *tty, struct ktermios *new_termios)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501{
Alan Cox978e5952008-04-30 00:53:59 -0700502 struct ktermios old_termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 struct tty_ldisc *ld;
Alan Cox04f378b2008-04-30 00:53:29 -0700504 unsigned long flags;
Alan Cox355d95a2008-02-08 04:18:48 -0800505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 /*
507 * Perform the actual termios internal changes under lock.
508 */
Alan Cox355d95a2008-02-08 04:18:48 -0800509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 /* FIXME: we need to decide on some locking/ordering semantics
512 for the set_termios notification eventually */
Arjan van de Ven5785c952006-09-29 02:00:43 -0700513 mutex_lock(&tty->termios_mutex);
Alan Cox978e5952008-04-30 00:53:59 -0700514 old_termios = *tty->termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 *tty->termios = *new_termios;
516 unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 /* See if packet mode change of state. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 if (tty->link && tty->link->packet) {
520 int old_flow = ((old_termios.c_iflag & IXON) &&
521 (old_termios.c_cc[VSTOP] == '\023') &&
522 (old_termios.c_cc[VSTART] == '\021'));
523 int new_flow = (I_IXON(tty) &&
524 STOP_CHAR(tty) == '\023' &&
525 START_CHAR(tty) == '\021');
526 if (old_flow != new_flow) {
Alan Cox04f378b2008-04-30 00:53:29 -0700527 spin_lock_irqsave(&tty->ctrl_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
529 if (new_flow)
530 tty->ctrl_status |= TIOCPKT_DOSTOP;
531 else
532 tty->ctrl_status |= TIOCPKT_NOSTOP;
Alan Cox04f378b2008-04-30 00:53:29 -0700533 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 wake_up_interruptible(&tty->link->read_wait);
535 }
536 }
Alan Cox355d95a2008-02-08 04:18:48 -0800537
Alan Coxf34d7a52008-04-30 00:54:13 -0700538 if (tty->ops->set_termios)
539 (*tty->ops->set_termios)(tty, &old_termios);
Alan Cox5f519d72007-10-16 23:30:07 -0700540 else
541 tty_termios_copy_hw(tty->termios, &old_termios);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 ld = tty_ldisc_ref(tty);
544 if (ld != NULL) {
Alan Coxa352def2008-07-16 21:53:12 +0100545 if (ld->ops->set_termios)
546 (ld->ops->set_termios)(tty, &old_termios);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 tty_ldisc_deref(ld);
548 }
Arjan van de Ven5785c952006-09-29 02:00:43 -0700549 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550}
551
Alan Coxaf9b8972006-08-27 01:24:01 -0700552/**
553 * set_termios - set termios values for a tty
554 * @tty: terminal device
555 * @arg: user data
556 * @opt: option information
557 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200558 * Helper function to prepare termios data and run necessary other
Alan Coxaf9b8972006-08-27 01:24:01 -0700559 * functions before using change_termios to do the actual changes.
560 *
561 * Locking:
Alan Coxd81ed102008-10-13 10:41:42 +0100562 * Called functions take ldisc and termios_mutex locks
Alan Coxaf9b8972006-08-27 01:24:01 -0700563 */
564
Alan Cox355d95a2008-02-08 04:18:48 -0800565static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
Alan Coxedc6afc2006-12-08 02:38:44 -0800567 struct ktermios tmp_termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 struct tty_ldisc *ld;
569 int retval = tty_check_change(tty);
570
571 if (retval)
572 return retval;
573
Alan Cox978e5952008-04-30 00:53:59 -0700574 mutex_lock(&tty->termios_mutex);
Alan Cox64bb6c52006-12-08 02:38:47 -0800575 memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
Alan Cox978e5952008-04-30 00:53:59 -0700576 mutex_unlock(&tty->termios_mutex);
Alan Cox64bb6c52006-12-08 02:38:47 -0800577
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 if (opt & TERMIOS_TERMIO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (user_termio_to_kernel_termios(&tmp_termios,
580 (struct termio __user *)arg))
581 return -EFAULT;
Alan Coxedc6afc2006-12-08 02:38:44 -0800582#ifdef TCGETS2
583 } else if (opt & TERMIOS_OLD) {
Alan Coxedc6afc2006-12-08 02:38:44 -0800584 if (user_termios_to_kernel_termios_1(&tmp_termios,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 (struct termios __user *)arg))
586 return -EFAULT;
Alan Cox64bb6c52006-12-08 02:38:47 -0800587 } else {
588 if (user_termios_to_kernel_termios(&tmp_termios,
589 (struct termios2 __user *)arg))
590 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 }
Alan Cox64bb6c52006-12-08 02:38:47 -0800592#else
593 } else if (user_termios_to_kernel_termios(&tmp_termios,
594 (struct termios __user *)arg))
595 return -EFAULT;
596#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Alan Cox355d95a2008-02-08 04:18:48 -0800598 /* If old style Bfoo values are used then load c_ispeed/c_ospeed
599 * with the real speed so its unconditionally usable */
Alan Coxedc6afc2006-12-08 02:38:44 -0800600 tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios);
601 tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios);
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 ld = tty_ldisc_ref(tty);
Alan Cox355d95a2008-02-08 04:18:48 -0800604
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (ld != NULL) {
Alan Coxa352def2008-07-16 21:53:12 +0100606 if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
607 ld->ops->flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 tty_ldisc_deref(ld);
609 }
Alan Cox355d95a2008-02-08 04:18:48 -0800610
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if (opt & TERMIOS_WAIT) {
612 tty_wait_until_sent(tty, 0);
613 if (signal_pending(current))
614 return -EINTR;
615 }
616
617 change_termios(tty, &tmp_termios);
Alan Cox5f519d72007-10-16 23:30:07 -0700618
619 /* FIXME: Arguably if tmp_termios == tty->termios AND the
620 actual requested termios was not tmp_termios then we may
621 want to return an error as no user requested change has
622 succeeded */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 return 0;
624}
625
Alan Cox26a2e202009-06-11 14:03:13 +0100626static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)
627{
628 mutex_lock(&tty->termios_mutex);
629 memcpy(kterm, tty->termios, sizeof(struct ktermios));
630 mutex_unlock(&tty->termios_mutex);
631}
632
633static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)
634{
635 mutex_lock(&tty->termios_mutex);
636 memcpy(kterm, tty->termios_locked, sizeof(struct ktermios));
637 mutex_unlock(&tty->termios_mutex);
638}
639
Alan Cox355d95a2008-02-08 04:18:48 -0800640static int get_termio(struct tty_struct *tty, struct termio __user *termio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
Alan Cox26a2e202009-06-11 14:03:13 +0100642 struct ktermios kterm;
643 copy_termios(tty, &kterm);
644 if (kernel_termios_to_user_termio(termio, &kterm))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 return -EFAULT;
646 return 0;
647}
648
Alan Cox1d65b4a2008-10-13 10:38:18 +0100649
650#ifdef TCGETX
651
652/**
653 * set_termiox - set termiox fields if possible
654 * @tty: terminal
655 * @arg: termiox structure from user
656 * @opt: option flags for ioctl type
657 *
658 * Implement the device calling points for the SYS5 termiox ioctl
659 * interface in Linux
660 */
661
662static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
663{
664 struct termiox tnew;
665 struct tty_ldisc *ld;
666
667 if (tty->termiox == NULL)
668 return -EINVAL;
669 if (copy_from_user(&tnew, arg, sizeof(struct termiox)))
670 return -EFAULT;
671
672 ld = tty_ldisc_ref(tty);
673 if (ld != NULL) {
674 if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
675 ld->ops->flush_buffer(tty);
676 tty_ldisc_deref(ld);
677 }
678 if (opt & TERMIOS_WAIT) {
679 tty_wait_until_sent(tty, 0);
680 if (signal_pending(current))
681 return -EINTR;
682 }
683
684 mutex_lock(&tty->termios_mutex);
685 if (tty->ops->set_termiox)
686 tty->ops->set_termiox(tty, &tnew);
687 mutex_unlock(&tty->termios_mutex);
688 return 0;
689}
690
691#endif
692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
694#ifdef TIOCGETP
695/*
696 * These are deprecated, but there is limited support..
697 *
698 * The "sg_flags" translation is a joke..
699 */
Alan Cox355d95a2008-02-08 04:18:48 -0800700static int get_sgflags(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701{
702 int flags = 0;
703
704 if (!(tty->termios->c_lflag & ICANON)) {
705 if (tty->termios->c_lflag & ISIG)
706 flags |= 0x02; /* cbreak */
707 else
708 flags |= 0x20; /* raw */
709 }
710 if (tty->termios->c_lflag & ECHO)
711 flags |= 0x08; /* echo */
712 if (tty->termios->c_oflag & OPOST)
713 if (tty->termios->c_oflag & ONLCR)
714 flags |= 0x10; /* crmod */
715 return flags;
716}
717
Alan Cox355d95a2008-02-08 04:18:48 -0800718static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719{
720 struct sgttyb tmp;
721
Arjan van de Ven5785c952006-09-29 02:00:43 -0700722 mutex_lock(&tty->termios_mutex);
Alan Cox606d0992006-12-08 02:38:45 -0800723 tmp.sg_ispeed = tty->termios->c_ispeed;
724 tmp.sg_ospeed = tty->termios->c_ospeed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 tmp.sg_erase = tty->termios->c_cc[VERASE];
726 tmp.sg_kill = tty->termios->c_cc[VKILL];
727 tmp.sg_flags = get_sgflags(tty);
Arjan van de Ven5785c952006-09-29 02:00:43 -0700728 mutex_unlock(&tty->termios_mutex);
Alan Cox355d95a2008-02-08 04:18:48 -0800729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
731}
732
Alan Cox355d95a2008-02-08 04:18:48 -0800733static void set_sgflags(struct ktermios *termios, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734{
735 termios->c_iflag = ICRNL | IXON;
736 termios->c_oflag = 0;
737 termios->c_lflag = ISIG | ICANON;
738 if (flags & 0x02) { /* cbreak */
739 termios->c_iflag = 0;
740 termios->c_lflag &= ~ICANON;
741 }
742 if (flags & 0x08) { /* echo */
743 termios->c_lflag |= ECHO | ECHOE | ECHOK |
744 ECHOCTL | ECHOKE | IEXTEN;
745 }
746 if (flags & 0x10) { /* crmod */
747 termios->c_oflag |= OPOST | ONLCR;
748 }
749 if (flags & 0x20) { /* raw */
750 termios->c_iflag = 0;
751 termios->c_lflag &= ~(ISIG | ICANON);
752 }
753 if (!(termios->c_lflag & ICANON)) {
754 termios->c_cc[VMIN] = 1;
755 termios->c_cc[VTIME] = 0;
756 }
757}
758
Alan Coxaf9b8972006-08-27 01:24:01 -0700759/**
760 * set_sgttyb - set legacy terminal values
761 * @tty: tty structure
762 * @sgttyb: pointer to old style terminal structure
763 *
764 * Updates a terminal from the legacy BSD style terminal information
765 * structure.
766 *
Alan Coxd81ed102008-10-13 10:41:42 +0100767 * Locking: termios_mutex
Alan Coxaf9b8972006-08-27 01:24:01 -0700768 */
769
Alan Cox355d95a2008-02-08 04:18:48 -0800770static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
772 int retval;
773 struct sgttyb tmp;
Alan Coxedc6afc2006-12-08 02:38:44 -0800774 struct ktermios termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 retval = tty_check_change(tty);
777 if (retval)
778 return retval;
Alan Cox355d95a2008-02-08 04:18:48 -0800779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
781 return -EFAULT;
782
Arjan van de Ven5785c952006-09-29 02:00:43 -0700783 mutex_lock(&tty->termios_mutex);
Jiri Slaby68043962007-07-15 23:40:18 -0700784 termios = *tty->termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 termios.c_cc[VERASE] = tmp.sg_erase;
786 termios.c_cc[VKILL] = tmp.sg_kill;
787 set_sgflags(&termios, tmp.sg_flags);
Alan Coxedc6afc2006-12-08 02:38:44 -0800788 /* Try and encode into Bfoo format */
789#ifdef BOTHER
Alan Cox355d95a2008-02-08 04:18:48 -0800790 tty_termios_encode_baud_rate(&termios, termios.c_ispeed,
791 termios.c_ospeed);
Alan Coxedc6afc2006-12-08 02:38:44 -0800792#endif
Arjan van de Ven5785c952006-09-29 02:00:43 -0700793 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 change_termios(tty, &termios);
795 return 0;
796}
797#endif
798
799#ifdef TIOCGETC
Alan Cox355d95a2008-02-08 04:18:48 -0800800static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801{
802 struct tchars tmp;
803
Alan Cox978e5952008-04-30 00:53:59 -0700804 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 tmp.t_intrc = tty->termios->c_cc[VINTR];
806 tmp.t_quitc = tty->termios->c_cc[VQUIT];
807 tmp.t_startc = tty->termios->c_cc[VSTART];
808 tmp.t_stopc = tty->termios->c_cc[VSTOP];
809 tmp.t_eofc = tty->termios->c_cc[VEOF];
810 tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */
Alan Cox978e5952008-04-30 00:53:59 -0700811 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
813}
814
Alan Cox355d95a2008-02-08 04:18:48 -0800815static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816{
817 struct tchars tmp;
818
819 if (copy_from_user(&tmp, tchars, sizeof(tmp)))
820 return -EFAULT;
Alan Cox978e5952008-04-30 00:53:59 -0700821 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 tty->termios->c_cc[VINTR] = tmp.t_intrc;
823 tty->termios->c_cc[VQUIT] = tmp.t_quitc;
824 tty->termios->c_cc[VSTART] = tmp.t_startc;
825 tty->termios->c_cc[VSTOP] = tmp.t_stopc;
826 tty->termios->c_cc[VEOF] = tmp.t_eofc;
827 tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
Alan Cox978e5952008-04-30 00:53:59 -0700828 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 return 0;
830}
831#endif
832
833#ifdef TIOCGLTC
Alan Cox355d95a2008-02-08 04:18:48 -0800834static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835{
836 struct ltchars tmp;
837
Alan Cox978e5952008-04-30 00:53:59 -0700838 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 tmp.t_suspc = tty->termios->c_cc[VSUSP];
Alan Cox355d95a2008-02-08 04:18:48 -0800840 /* what is dsuspc anyway? */
841 tmp.t_dsuspc = tty->termios->c_cc[VSUSP];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
Alan Cox355d95a2008-02-08 04:18:48 -0800843 /* what is flushc anyway? */
844 tmp.t_flushc = tty->termios->c_cc[VEOL2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 tmp.t_werasc = tty->termios->c_cc[VWERASE];
846 tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
Alan Cox978e5952008-04-30 00:53:59 -0700847 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
849}
850
Alan Cox355d95a2008-02-08 04:18:48 -0800851static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852{
853 struct ltchars tmp;
854
855 if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
856 return -EFAULT;
857
Alan Cox978e5952008-04-30 00:53:59 -0700858 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 tty->termios->c_cc[VSUSP] = tmp.t_suspc;
Alan Cox355d95a2008-02-08 04:18:48 -0800860 /* what is dsuspc anyway? */
861 tty->termios->c_cc[VEOL2] = tmp.t_dsuspc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
Alan Cox355d95a2008-02-08 04:18:48 -0800863 /* what is flushc anyway? */
864 tty->termios->c_cc[VEOL2] = tmp.t_flushc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 tty->termios->c_cc[VWERASE] = tmp.t_werasc;
866 tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
Alan Cox978e5952008-04-30 00:53:59 -0700867 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 return 0;
869}
870#endif
871
Alan Coxaf9b8972006-08-27 01:24:01 -0700872/**
873 * send_prio_char - send priority character
874 *
875 * Send a high priority character to the tty even if stopped
876 *
Alan Cox5f412b22006-09-29 02:01:40 -0700877 * Locking: none for xchar method, write ordering for write method.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 */
Alan Coxaf9b8972006-08-27 01:24:01 -0700879
Alan Cox5f412b22006-09-29 02:01:40 -0700880static int send_prio_char(struct tty_struct *tty, char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
882 int was_stopped = tty->stopped;
883
Alan Coxf34d7a52008-04-30 00:54:13 -0700884 if (tty->ops->send_xchar) {
885 tty->ops->send_xchar(tty, ch);
Alan Cox5f412b22006-09-29 02:01:40 -0700886 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 }
Alan Cox5f412b22006-09-29 02:01:40 -0700888
Alan Cox9c1729d2007-07-15 23:39:43 -0700889 if (tty_write_lock(tty, 0) < 0)
Alan Cox5f412b22006-09-29 02:01:40 -0700890 return -ERESTARTSYS;
891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 if (was_stopped)
893 start_tty(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700894 tty->ops->write(tty, &ch, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (was_stopped)
896 stop_tty(tty);
Alan Cox9c1729d2007-07-15 23:39:43 -0700897 tty_write_unlock(tty);
Alan Cox5f412b22006-09-29 02:01:40 -0700898 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899}
900
Alan Cox0fc00e22007-11-07 01:24:56 -0800901/**
Alan Cox1c2630c2008-04-30 00:53:34 -0700902 * tty_change_softcar - carrier change ioctl helper
903 * @tty: tty to update
904 * @arg: enable/disable CLOCAL
905 *
906 * Perform a change to the CLOCAL state and call into the driver
907 * layer to make it visible. All done with the termios mutex
908 */
909
910static int tty_change_softcar(struct tty_struct *tty, int arg)
911{
912 int ret = 0;
913 int bit = arg ? CLOCAL : 0;
Alan Coxf34d7a52008-04-30 00:54:13 -0700914 struct ktermios old;
Alan Cox1c2630c2008-04-30 00:53:34 -0700915
916 mutex_lock(&tty->termios_mutex);
Alan Coxf34d7a52008-04-30 00:54:13 -0700917 old = *tty->termios;
Alan Cox1c2630c2008-04-30 00:53:34 -0700918 tty->termios->c_cflag &= ~CLOCAL;
919 tty->termios->c_cflag |= bit;
Alan Coxf34d7a52008-04-30 00:54:13 -0700920 if (tty->ops->set_termios)
921 tty->ops->set_termios(tty, &old);
Alan Cox1c2630c2008-04-30 00:53:34 -0700922 if ((tty->termios->c_cflag & CLOCAL) != bit)
923 ret = -EINVAL;
924 mutex_unlock(&tty->termios_mutex);
925 return ret;
926}
927
928/**
Alan Cox0fc00e22007-11-07 01:24:56 -0800929 * tty_mode_ioctl - mode related ioctls
930 * @tty: tty for the ioctl
931 * @file: file pointer for the tty
932 * @cmd: command
933 * @arg: ioctl argument
934 *
935 * Perform non line discipline specific mode control ioctls. This
936 * is designed to be called by line disciplines to ensure they provide
937 * consistent mode setting.
938 */
939
Alan Cox355d95a2008-02-08 04:18:48 -0800940int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
Alan Cox0fc00e22007-11-07 01:24:56 -0800941 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942{
Alan Cox355d95a2008-02-08 04:18:48 -0800943 struct tty_struct *real_tty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 void __user *p = (void __user *)arg;
Alan Cox8f520022008-10-13 10:38:46 +0100945 int ret = 0;
Alan Cox26a2e202009-06-11 14:03:13 +0100946 struct ktermios kterm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
948 if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
949 tty->driver->subtype == PTY_TYPE_MASTER)
950 real_tty = tty->link;
951 else
952 real_tty = tty;
953
954 switch (cmd) {
955#ifdef TIOCGETP
Alan Cox355d95a2008-02-08 04:18:48 -0800956 case TIOCGETP:
957 return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
958 case TIOCSETP:
959 case TIOCSETN:
960 return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961#endif
962#ifdef TIOCGETC
Alan Cox355d95a2008-02-08 04:18:48 -0800963 case TIOCGETC:
964 return get_tchars(real_tty, p);
965 case TIOCSETC:
966 return set_tchars(real_tty, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967#endif
968#ifdef TIOCGLTC
Alan Cox355d95a2008-02-08 04:18:48 -0800969 case TIOCGLTC:
970 return get_ltchars(real_tty, p);
971 case TIOCSLTC:
972 return set_ltchars(real_tty, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973#endif
Alan Cox355d95a2008-02-08 04:18:48 -0800974 case TCSETSF:
975 return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD);
976 case TCSETSW:
977 return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD);
978 case TCSETS:
979 return set_termios(real_tty, p, TERMIOS_OLD);
Alan Coxedc6afc2006-12-08 02:38:44 -0800980#ifndef TCGETS2
Alan Cox355d95a2008-02-08 04:18:48 -0800981 case TCGETS:
Alan Cox26a2e202009-06-11 14:03:13 +0100982 copy_termios(real_tty, &kterm);
983 if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +0100984 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +0100985 return ret;
Alan Coxedc6afc2006-12-08 02:38:44 -0800986#else
Alan Cox355d95a2008-02-08 04:18:48 -0800987 case TCGETS:
Alan Cox26a2e202009-06-11 14:03:13 +0100988 copy_termios(real_tty, &kterm);
989 if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +0100990 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +0100991 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -0800992 case TCGETS2:
Alan Cox26a2e202009-06-11 14:03:13 +0100993 copy_termios(real_tty, &kterm);
994 if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +0100995 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +0100996 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -0800997 case TCSETSF2:
998 return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT);
999 case TCSETSW2:
1000 return set_termios(real_tty, p, TERMIOS_WAIT);
1001 case TCSETS2:
1002 return set_termios(real_tty, p, 0);
Alan Coxedc6afc2006-12-08 02:38:44 -08001003#endif
Alan Cox355d95a2008-02-08 04:18:48 -08001004 case TCGETA:
1005 return get_termio(real_tty, p);
1006 case TCSETAF:
1007 return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
1008 case TCSETAW:
1009 return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
1010 case TCSETA:
1011 return set_termios(real_tty, p, TERMIOS_TERMIO);
Alan Cox0fc00e22007-11-07 01:24:56 -08001012#ifndef TCGETS2
Alan Cox355d95a2008-02-08 04:18:48 -08001013 case TIOCGLCKTRMIOS:
Alan Cox26a2e202009-06-11 14:03:13 +01001014 copy_termios_locked(real_tty, &kterm);
1015 if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +01001016 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001017 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001018 case TIOCSLCKTRMIOS:
1019 if (!capable(CAP_SYS_ADMIN))
1020 return -EPERM;
Alan Cox26a2e202009-06-11 14:03:13 +01001021 copy_termios_locked(real_tty, &kterm);
1022 if (user_termios_to_kernel_termios(&kterm,
Alan Cox355d95a2008-02-08 04:18:48 -08001023 (struct termios __user *) arg))
Alan Cox26a2e202009-06-11 14:03:13 +01001024 return -EFAULT;
1025 mutex_lock(&real_tty->termios_mutex);
1026 memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios));
Alan Cox8f520022008-10-13 10:38:46 +01001027 mutex_unlock(&real_tty->termios_mutex);
Alan Cox26a2e202009-06-11 14:03:13 +01001028 return 0;
Alan Cox0fc00e22007-11-07 01:24:56 -08001029#else
Alan Cox355d95a2008-02-08 04:18:48 -08001030 case TIOCGLCKTRMIOS:
Alan Cox26a2e202009-06-11 14:03:13 +01001031 copy_termios_locked(real_tty, &kterm);
1032 if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +01001033 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001034 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001035 case TIOCSLCKTRMIOS:
1036 if (!capable(CAP_SYS_ADMIN))
Alan Cox26a2e202009-06-11 14:03:13 +01001037 return -EPERM;
1038 copy_termios_locked(real_tty, &kterm);
1039 if (user_termios_to_kernel_termios_1(&kterm,
Alan Cox355d95a2008-02-08 04:18:48 -08001040 (struct termios __user *) arg))
Alan Cox26a2e202009-06-11 14:03:13 +01001041 return -EFAULT;
1042 mutex_lock(&real_tty->termios_mutex);
1043 memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios));
Alan Cox8f520022008-10-13 10:38:46 +01001044 mutex_unlock(&real_tty->termios_mutex);
1045 return ret;
Alan Cox0fc00e22007-11-07 01:24:56 -08001046#endif
Alan Cox1d65b4a2008-10-13 10:38:18 +01001047#ifdef TCGETX
Mike Frysinger5dca6072009-06-16 17:01:02 +01001048 case TCGETX: {
1049 struct termiox ktermx;
Alan Cox1d65b4a2008-10-13 10:38:18 +01001050 if (real_tty->termiox == NULL)
1051 return -EINVAL;
Alan Cox8f520022008-10-13 10:38:46 +01001052 mutex_lock(&real_tty->termios_mutex);
Alan Cox26a2e202009-06-11 14:03:13 +01001053 memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox));
Alan Cox8f520022008-10-13 10:38:46 +01001054 mutex_unlock(&real_tty->termios_mutex);
Alan Cox26a2e202009-06-11 14:03:13 +01001055 if (copy_to_user(p, &ktermx, sizeof(struct termiox)))
1056 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001057 return ret;
Mike Frysinger5dca6072009-06-16 17:01:02 +01001058 }
Alan Cox1d65b4a2008-10-13 10:38:18 +01001059 case TCSETX:
1060 return set_termiox(real_tty, p, 0);
1061 case TCSETXW:
1062 return set_termiox(real_tty, p, TERMIOS_WAIT);
1063 case TCSETXF:
1064 return set_termiox(real_tty, p, TERMIOS_FLUSH);
1065#endif
Alan Cox355d95a2008-02-08 04:18:48 -08001066 case TIOCGSOFTCAR:
Alan Cox26a2e202009-06-11 14:03:13 +01001067 copy_termios(real_tty, &kterm);
1068 ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0,
Alan Cox355d95a2008-02-08 04:18:48 -08001069 (int __user *)arg);
Alan Cox8f520022008-10-13 10:38:46 +01001070 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001071 case TIOCSSOFTCAR:
1072 if (get_user(arg, (unsigned int __user *) arg))
1073 return -EFAULT;
Alan Coxf753f322008-08-26 19:52:47 +01001074 return tty_change_softcar(real_tty, arg);
Alan Cox355d95a2008-02-08 04:18:48 -08001075 default:
1076 return -ENOIOCTLCMD;
Alan Cox0fc00e22007-11-07 01:24:56 -08001077 }
1078}
Alan Cox0fc00e22007-11-07 01:24:56 -08001079EXPORT_SYMBOL_GPL(tty_mode_ioctl);
1080
1081int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
1082{
1083 struct tty_ldisc *ld;
1084 int retval = tty_check_change(tty);
1085 if (retval)
1086 return retval;
1087
Alan Coxc0253ee2009-01-15 13:30:25 +00001088 ld = tty_ldisc_ref_wait(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001089 switch (arg) {
1090 case TCIFLUSH:
Alan Coxa352def2008-07-16 21:53:12 +01001091 if (ld && ld->ops->flush_buffer)
1092 ld->ops->flush_buffer(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001093 break;
1094 case TCIOFLUSH:
Alan Coxa352def2008-07-16 21:53:12 +01001095 if (ld && ld->ops->flush_buffer)
1096 ld->ops->flush_buffer(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001097 /* fall through */
1098 case TCOFLUSH:
Alan Coxf34d7a52008-04-30 00:54:13 -07001099 tty_driver_flush_buffer(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001100 break;
1101 default:
1102 tty_ldisc_deref(ld);
1103 return -EINVAL;
1104 }
1105 tty_ldisc_deref(ld);
1106 return 0;
1107}
Alan Cox0fc00e22007-11-07 01:24:56 -08001108EXPORT_SYMBOL_GPL(tty_perform_flush);
1109
Alan Cox47afa7a2008-10-13 10:44:17 +01001110int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
Alan Cox0fc00e22007-11-07 01:24:56 -08001111 unsigned int cmd, unsigned long arg)
1112{
Alan Cox04f378b2008-04-30 00:53:29 -07001113 unsigned long flags;
Alan Cox0fc00e22007-11-07 01:24:56 -08001114 int retval;
1115
Alan Cox0fc00e22007-11-07 01:24:56 -08001116 switch (cmd) {
Alan Cox355d95a2008-02-08 04:18:48 -08001117 case TCXONC:
1118 retval = tty_check_change(tty);
1119 if (retval)
1120 return retval;
1121 switch (arg) {
1122 case TCOOFF:
1123 if (!tty->flow_stopped) {
1124 tty->flow_stopped = 1;
1125 stop_tty(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 }
Alan Cox355d95a2008-02-08 04:18:48 -08001127 break;
1128 case TCOON:
1129 if (tty->flow_stopped) {
1130 tty->flow_stopped = 0;
1131 start_tty(tty);
1132 }
1133 break;
1134 case TCIOFF:
1135 if (STOP_CHAR(tty) != __DISABLED_CHAR)
1136 return send_prio_char(tty, STOP_CHAR(tty));
1137 break;
1138 case TCION:
1139 if (START_CHAR(tty) != __DISABLED_CHAR)
1140 return send_prio_char(tty, START_CHAR(tty));
1141 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 default:
Alan Cox355d95a2008-02-08 04:18:48 -08001143 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 }
Alan Cox355d95a2008-02-08 04:18:48 -08001145 return 0;
1146 case TCFLSH:
1147 return tty_perform_flush(tty, arg);
Alan Cox355d95a2008-02-08 04:18:48 -08001148 case TIOCPKT:
1149 {
1150 int pktmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Alan Cox355d95a2008-02-08 04:18:48 -08001152 if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
1153 tty->driver->subtype != PTY_TYPE_MASTER)
1154 return -ENOTTY;
1155 if (get_user(pktmode, (int __user *) arg))
1156 return -EFAULT;
Alan Cox04f378b2008-04-30 00:53:29 -07001157 spin_lock_irqsave(&tty->ctrl_lock, flags);
Alan Cox355d95a2008-02-08 04:18:48 -08001158 if (pktmode) {
1159 if (!tty->packet) {
1160 tty->packet = 1;
1161 tty->link->ctrl_status = 0;
1162 }
1163 } else
1164 tty->packet = 0;
Alan Cox04f378b2008-04-30 00:53:29 -07001165 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
Alan Cox355d95a2008-02-08 04:18:48 -08001166 return 0;
1167 }
1168 default:
1169 /* Try the mode commands */
1170 return tty_mode_ioctl(tty, file, cmd, arg);
1171 }
1172}
Alan Cox47afa7a2008-10-13 10:44:17 +01001173EXPORT_SYMBOL(n_tty_ioctl_helper);