blob: 0c18899714593325fa4e51f3235ad5a23e9ed0c4 [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) {
hyc@symas.com26df6d12010-06-22 10:14:49 -0700520 int extproc = (old_termios.c_lflag & EXTPROC) |
521 (tty->termios->c_lflag & EXTPROC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 int old_flow = ((old_termios.c_iflag & IXON) &&
523 (old_termios.c_cc[VSTOP] == '\023') &&
524 (old_termios.c_cc[VSTART] == '\021'));
525 int new_flow = (I_IXON(tty) &&
526 STOP_CHAR(tty) == '\023' &&
527 START_CHAR(tty) == '\021');
hyc@symas.com26df6d12010-06-22 10:14:49 -0700528 if ((old_flow != new_flow) || extproc) {
Alan Cox04f378b2008-04-30 00:53:29 -0700529 spin_lock_irqsave(&tty->ctrl_lock, flags);
hyc@symas.com26df6d12010-06-22 10:14:49 -0700530 if (old_flow != new_flow) {
531 tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
532 if (new_flow)
533 tty->ctrl_status |= TIOCPKT_DOSTOP;
534 else
535 tty->ctrl_status |= TIOCPKT_NOSTOP;
536 }
537 if (extproc)
538 tty->ctrl_status |= TIOCPKT_IOCTL;
Alan Cox04f378b2008-04-30 00:53:29 -0700539 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 wake_up_interruptible(&tty->link->read_wait);
541 }
542 }
Alan Cox355d95a2008-02-08 04:18:48 -0800543
Alan Coxf34d7a52008-04-30 00:54:13 -0700544 if (tty->ops->set_termios)
545 (*tty->ops->set_termios)(tty, &old_termios);
Alan Cox5f519d72007-10-16 23:30:07 -0700546 else
547 tty_termios_copy_hw(tty->termios, &old_termios);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
549 ld = tty_ldisc_ref(tty);
550 if (ld != NULL) {
Alan Coxa352def2008-07-16 21:53:12 +0100551 if (ld->ops->set_termios)
552 (ld->ops->set_termios)(tty, &old_termios);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 tty_ldisc_deref(ld);
554 }
Arjan van de Ven5785c952006-09-29 02:00:43 -0700555 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556}
557
Alan Coxaf9b8972006-08-27 01:24:01 -0700558/**
559 * set_termios - set termios values for a tty
560 * @tty: terminal device
561 * @arg: user data
562 * @opt: option information
563 *
Robert P. J. Day3a4fa0a2007-10-19 23:10:43 +0200564 * Helper function to prepare termios data and run necessary other
Alan Coxaf9b8972006-08-27 01:24:01 -0700565 * functions before using change_termios to do the actual changes.
566 *
567 * Locking:
Alan Coxd81ed102008-10-13 10:41:42 +0100568 * Called functions take ldisc and termios_mutex locks
Alan Coxaf9b8972006-08-27 01:24:01 -0700569 */
570
Alan Cox355d95a2008-02-08 04:18:48 -0800571static int set_termios(struct tty_struct *tty, void __user *arg, int opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Alan Coxedc6afc2006-12-08 02:38:44 -0800573 struct ktermios tmp_termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 struct tty_ldisc *ld;
575 int retval = tty_check_change(tty);
576
577 if (retval)
578 return retval;
579
Alan Cox978e5952008-04-30 00:53:59 -0700580 mutex_lock(&tty->termios_mutex);
Alan Cox64bb6c52006-12-08 02:38:47 -0800581 memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
Alan Cox978e5952008-04-30 00:53:59 -0700582 mutex_unlock(&tty->termios_mutex);
Alan Cox64bb6c52006-12-08 02:38:47 -0800583
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 if (opt & TERMIOS_TERMIO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 if (user_termio_to_kernel_termios(&tmp_termios,
586 (struct termio __user *)arg))
587 return -EFAULT;
Alan Coxedc6afc2006-12-08 02:38:44 -0800588#ifdef TCGETS2
589 } else if (opt & TERMIOS_OLD) {
Alan Coxedc6afc2006-12-08 02:38:44 -0800590 if (user_termios_to_kernel_termios_1(&tmp_termios,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 (struct termios __user *)arg))
592 return -EFAULT;
Alan Cox64bb6c52006-12-08 02:38:47 -0800593 } else {
594 if (user_termios_to_kernel_termios(&tmp_termios,
595 (struct termios2 __user *)arg))
596 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 }
Alan Cox64bb6c52006-12-08 02:38:47 -0800598#else
599 } else if (user_termios_to_kernel_termios(&tmp_termios,
600 (struct termios __user *)arg))
601 return -EFAULT;
602#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Alan Cox355d95a2008-02-08 04:18:48 -0800604 /* If old style Bfoo values are used then load c_ispeed/c_ospeed
605 * with the real speed so its unconditionally usable */
Alan Coxedc6afc2006-12-08 02:38:44 -0800606 tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios);
607 tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios);
608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 ld = tty_ldisc_ref(tty);
Alan Cox355d95a2008-02-08 04:18:48 -0800610
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if (ld != NULL) {
Alan Coxa352def2008-07-16 21:53:12 +0100612 if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
613 ld->ops->flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 tty_ldisc_deref(ld);
615 }
Alan Cox355d95a2008-02-08 04:18:48 -0800616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 if (opt & TERMIOS_WAIT) {
618 tty_wait_until_sent(tty, 0);
619 if (signal_pending(current))
620 return -EINTR;
621 }
622
623 change_termios(tty, &tmp_termios);
Alan Cox5f519d72007-10-16 23:30:07 -0700624
625 /* FIXME: Arguably if tmp_termios == tty->termios AND the
626 actual requested termios was not tmp_termios then we may
627 want to return an error as no user requested change has
628 succeeded */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 return 0;
630}
631
Alan Cox26a2e202009-06-11 14:03:13 +0100632static void copy_termios(struct tty_struct *tty, struct ktermios *kterm)
633{
634 mutex_lock(&tty->termios_mutex);
635 memcpy(kterm, tty->termios, sizeof(struct ktermios));
636 mutex_unlock(&tty->termios_mutex);
637}
638
639static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm)
640{
641 mutex_lock(&tty->termios_mutex);
642 memcpy(kterm, tty->termios_locked, sizeof(struct ktermios));
643 mutex_unlock(&tty->termios_mutex);
644}
645
Alan Cox355d95a2008-02-08 04:18:48 -0800646static int get_termio(struct tty_struct *tty, struct termio __user *termio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647{
Alan Cox26a2e202009-06-11 14:03:13 +0100648 struct ktermios kterm;
649 copy_termios(tty, &kterm);
650 if (kernel_termios_to_user_termio(termio, &kterm))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 return -EFAULT;
652 return 0;
653}
654
Alan Cox1d65b4a2008-10-13 10:38:18 +0100655
656#ifdef TCGETX
657
658/**
659 * set_termiox - set termiox fields if possible
660 * @tty: terminal
661 * @arg: termiox structure from user
662 * @opt: option flags for ioctl type
663 *
664 * Implement the device calling points for the SYS5 termiox ioctl
665 * interface in Linux
666 */
667
668static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
669{
670 struct termiox tnew;
671 struct tty_ldisc *ld;
672
673 if (tty->termiox == NULL)
674 return -EINVAL;
675 if (copy_from_user(&tnew, arg, sizeof(struct termiox)))
676 return -EFAULT;
677
678 ld = tty_ldisc_ref(tty);
679 if (ld != NULL) {
680 if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
681 ld->ops->flush_buffer(tty);
682 tty_ldisc_deref(ld);
683 }
684 if (opt & TERMIOS_WAIT) {
685 tty_wait_until_sent(tty, 0);
686 if (signal_pending(current))
687 return -EINTR;
688 }
689
690 mutex_lock(&tty->termios_mutex);
691 if (tty->ops->set_termiox)
692 tty->ops->set_termiox(tty, &tnew);
693 mutex_unlock(&tty->termios_mutex);
694 return 0;
695}
696
697#endif
698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700#ifdef TIOCGETP
701/*
702 * These are deprecated, but there is limited support..
703 *
704 * The "sg_flags" translation is a joke..
705 */
Alan Cox355d95a2008-02-08 04:18:48 -0800706static int get_sgflags(struct tty_struct *tty)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
708 int flags = 0;
709
710 if (!(tty->termios->c_lflag & ICANON)) {
711 if (tty->termios->c_lflag & ISIG)
712 flags |= 0x02; /* cbreak */
713 else
714 flags |= 0x20; /* raw */
715 }
716 if (tty->termios->c_lflag & ECHO)
717 flags |= 0x08; /* echo */
718 if (tty->termios->c_oflag & OPOST)
719 if (tty->termios->c_oflag & ONLCR)
720 flags |= 0x10; /* crmod */
721 return flags;
722}
723
Alan Cox355d95a2008-02-08 04:18:48 -0800724static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725{
726 struct sgttyb tmp;
727
Arjan van de Ven5785c952006-09-29 02:00:43 -0700728 mutex_lock(&tty->termios_mutex);
Alan Cox606d0992006-12-08 02:38:45 -0800729 tmp.sg_ispeed = tty->termios->c_ispeed;
730 tmp.sg_ospeed = tty->termios->c_ospeed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 tmp.sg_erase = tty->termios->c_cc[VERASE];
732 tmp.sg_kill = tty->termios->c_cc[VKILL];
733 tmp.sg_flags = get_sgflags(tty);
Arjan van de Ven5785c952006-09-29 02:00:43 -0700734 mutex_unlock(&tty->termios_mutex);
Alan Cox355d95a2008-02-08 04:18:48 -0800735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
737}
738
Alan Cox355d95a2008-02-08 04:18:48 -0800739static void set_sgflags(struct ktermios *termios, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740{
741 termios->c_iflag = ICRNL | IXON;
742 termios->c_oflag = 0;
743 termios->c_lflag = ISIG | ICANON;
744 if (flags & 0x02) { /* cbreak */
745 termios->c_iflag = 0;
746 termios->c_lflag &= ~ICANON;
747 }
748 if (flags & 0x08) { /* echo */
749 termios->c_lflag |= ECHO | ECHOE | ECHOK |
750 ECHOCTL | ECHOKE | IEXTEN;
751 }
752 if (flags & 0x10) { /* crmod */
753 termios->c_oflag |= OPOST | ONLCR;
754 }
755 if (flags & 0x20) { /* raw */
756 termios->c_iflag = 0;
757 termios->c_lflag &= ~(ISIG | ICANON);
758 }
759 if (!(termios->c_lflag & ICANON)) {
760 termios->c_cc[VMIN] = 1;
761 termios->c_cc[VTIME] = 0;
762 }
763}
764
Alan Coxaf9b8972006-08-27 01:24:01 -0700765/**
766 * set_sgttyb - set legacy terminal values
767 * @tty: tty structure
768 * @sgttyb: pointer to old style terminal structure
769 *
770 * Updates a terminal from the legacy BSD style terminal information
771 * structure.
772 *
Alan Coxd81ed102008-10-13 10:41:42 +0100773 * Locking: termios_mutex
Alan Coxaf9b8972006-08-27 01:24:01 -0700774 */
775
Alan Cox355d95a2008-02-08 04:18:48 -0800776static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
778 int retval;
779 struct sgttyb tmp;
Alan Coxedc6afc2006-12-08 02:38:44 -0800780 struct ktermios termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
782 retval = tty_check_change(tty);
783 if (retval)
784 return retval;
Alan Cox355d95a2008-02-08 04:18:48 -0800785
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
787 return -EFAULT;
788
Arjan van de Ven5785c952006-09-29 02:00:43 -0700789 mutex_lock(&tty->termios_mutex);
Jiri Slaby68043962007-07-15 23:40:18 -0700790 termios = *tty->termios;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 termios.c_cc[VERASE] = tmp.sg_erase;
792 termios.c_cc[VKILL] = tmp.sg_kill;
793 set_sgflags(&termios, tmp.sg_flags);
Alan Coxedc6afc2006-12-08 02:38:44 -0800794 /* Try and encode into Bfoo format */
795#ifdef BOTHER
Alan Cox355d95a2008-02-08 04:18:48 -0800796 tty_termios_encode_baud_rate(&termios, termios.c_ispeed,
797 termios.c_ospeed);
Alan Coxedc6afc2006-12-08 02:38:44 -0800798#endif
Arjan van de Ven5785c952006-09-29 02:00:43 -0700799 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 change_termios(tty, &termios);
801 return 0;
802}
803#endif
804
805#ifdef TIOCGETC
Alan Cox355d95a2008-02-08 04:18:48 -0800806static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807{
808 struct tchars tmp;
809
Alan Cox978e5952008-04-30 00:53:59 -0700810 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 tmp.t_intrc = tty->termios->c_cc[VINTR];
812 tmp.t_quitc = tty->termios->c_cc[VQUIT];
813 tmp.t_startc = tty->termios->c_cc[VSTART];
814 tmp.t_stopc = tty->termios->c_cc[VSTOP];
815 tmp.t_eofc = tty->termios->c_cc[VEOF];
816 tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */
Alan Cox978e5952008-04-30 00:53:59 -0700817 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
819}
820
Alan Cox355d95a2008-02-08 04:18:48 -0800821static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822{
823 struct tchars tmp;
824
825 if (copy_from_user(&tmp, tchars, sizeof(tmp)))
826 return -EFAULT;
Alan Cox978e5952008-04-30 00:53:59 -0700827 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 tty->termios->c_cc[VINTR] = tmp.t_intrc;
829 tty->termios->c_cc[VQUIT] = tmp.t_quitc;
830 tty->termios->c_cc[VSTART] = tmp.t_startc;
831 tty->termios->c_cc[VSTOP] = tmp.t_stopc;
832 tty->termios->c_cc[VEOF] = tmp.t_eofc;
833 tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
Alan Cox978e5952008-04-30 00:53:59 -0700834 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 return 0;
836}
837#endif
838
839#ifdef TIOCGLTC
Alan Cox355d95a2008-02-08 04:18:48 -0800840static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841{
842 struct ltchars tmp;
843
Alan Cox978e5952008-04-30 00:53:59 -0700844 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 tmp.t_suspc = tty->termios->c_cc[VSUSP];
Alan Cox355d95a2008-02-08 04:18:48 -0800846 /* what is dsuspc anyway? */
847 tmp.t_dsuspc = tty->termios->c_cc[VSUSP];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
Alan Cox355d95a2008-02-08 04:18:48 -0800849 /* what is flushc anyway? */
850 tmp.t_flushc = tty->termios->c_cc[VEOL2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 tmp.t_werasc = tty->termios->c_cc[VWERASE];
852 tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
Alan Cox978e5952008-04-30 00:53:59 -0700853 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
855}
856
Alan Cox355d95a2008-02-08 04:18:48 -0800857static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858{
859 struct ltchars tmp;
860
861 if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
862 return -EFAULT;
863
Alan Cox978e5952008-04-30 00:53:59 -0700864 mutex_lock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 tty->termios->c_cc[VSUSP] = tmp.t_suspc;
Alan Cox355d95a2008-02-08 04:18:48 -0800866 /* what is dsuspc anyway? */
867 tty->termios->c_cc[VEOL2] = tmp.t_dsuspc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
Alan Cox355d95a2008-02-08 04:18:48 -0800869 /* what is flushc anyway? */
870 tty->termios->c_cc[VEOL2] = tmp.t_flushc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 tty->termios->c_cc[VWERASE] = tmp.t_werasc;
872 tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
Alan Cox978e5952008-04-30 00:53:59 -0700873 mutex_unlock(&tty->termios_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 return 0;
875}
876#endif
877
Alan Coxaf9b8972006-08-27 01:24:01 -0700878/**
879 * send_prio_char - send priority character
880 *
881 * Send a high priority character to the tty even if stopped
882 *
Alan Cox5f412b22006-09-29 02:01:40 -0700883 * Locking: none for xchar method, write ordering for write method.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 */
Alan Coxaf9b8972006-08-27 01:24:01 -0700885
Alan Cox5f412b22006-09-29 02:01:40 -0700886static int send_prio_char(struct tty_struct *tty, char ch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
888 int was_stopped = tty->stopped;
889
Alan Coxf34d7a52008-04-30 00:54:13 -0700890 if (tty->ops->send_xchar) {
891 tty->ops->send_xchar(tty, ch);
Alan Cox5f412b22006-09-29 02:01:40 -0700892 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 }
Alan Cox5f412b22006-09-29 02:01:40 -0700894
Alan Cox9c1729d2007-07-15 23:39:43 -0700895 if (tty_write_lock(tty, 0) < 0)
Alan Cox5f412b22006-09-29 02:01:40 -0700896 return -ERESTARTSYS;
897
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (was_stopped)
899 start_tty(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700900 tty->ops->write(tty, &ch, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (was_stopped)
902 stop_tty(tty);
Alan Cox9c1729d2007-07-15 23:39:43 -0700903 tty_write_unlock(tty);
Alan Cox5f412b22006-09-29 02:01:40 -0700904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Alan Cox0fc00e22007-11-07 01:24:56 -0800907/**
Alan Cox1c2630c2008-04-30 00:53:34 -0700908 * tty_change_softcar - carrier change ioctl helper
909 * @tty: tty to update
910 * @arg: enable/disable CLOCAL
911 *
912 * Perform a change to the CLOCAL state and call into the driver
913 * layer to make it visible. All done with the termios mutex
914 */
915
916static int tty_change_softcar(struct tty_struct *tty, int arg)
917{
918 int ret = 0;
919 int bit = arg ? CLOCAL : 0;
Alan Coxf34d7a52008-04-30 00:54:13 -0700920 struct ktermios old;
Alan Cox1c2630c2008-04-30 00:53:34 -0700921
922 mutex_lock(&tty->termios_mutex);
Alan Coxf34d7a52008-04-30 00:54:13 -0700923 old = *tty->termios;
Alan Cox1c2630c2008-04-30 00:53:34 -0700924 tty->termios->c_cflag &= ~CLOCAL;
925 tty->termios->c_cflag |= bit;
Alan Coxf34d7a52008-04-30 00:54:13 -0700926 if (tty->ops->set_termios)
927 tty->ops->set_termios(tty, &old);
Alan Cox1c2630c2008-04-30 00:53:34 -0700928 if ((tty->termios->c_cflag & CLOCAL) != bit)
929 ret = -EINVAL;
930 mutex_unlock(&tty->termios_mutex);
931 return ret;
932}
933
934/**
Alan Cox0fc00e22007-11-07 01:24:56 -0800935 * tty_mode_ioctl - mode related ioctls
936 * @tty: tty for the ioctl
937 * @file: file pointer for the tty
938 * @cmd: command
939 * @arg: ioctl argument
940 *
941 * Perform non line discipline specific mode control ioctls. This
942 * is designed to be called by line disciplines to ensure they provide
943 * consistent mode setting.
944 */
945
Alan Cox355d95a2008-02-08 04:18:48 -0800946int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
Alan Cox0fc00e22007-11-07 01:24:56 -0800947 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948{
Alan Cox355d95a2008-02-08 04:18:48 -0800949 struct tty_struct *real_tty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 void __user *p = (void __user *)arg;
Alan Cox8f520022008-10-13 10:38:46 +0100951 int ret = 0;
Alan Cox26a2e202009-06-11 14:03:13 +0100952 struct ktermios kterm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954 if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
955 tty->driver->subtype == PTY_TYPE_MASTER)
956 real_tty = tty->link;
957 else
958 real_tty = tty;
959
960 switch (cmd) {
961#ifdef TIOCGETP
Alan Cox355d95a2008-02-08 04:18:48 -0800962 case TIOCGETP:
963 return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
964 case TIOCSETP:
965 case TIOCSETN:
966 return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967#endif
968#ifdef TIOCGETC
Alan Cox355d95a2008-02-08 04:18:48 -0800969 case TIOCGETC:
970 return get_tchars(real_tty, p);
971 case TIOCSETC:
972 return set_tchars(real_tty, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973#endif
974#ifdef TIOCGLTC
Alan Cox355d95a2008-02-08 04:18:48 -0800975 case TIOCGLTC:
976 return get_ltchars(real_tty, p);
977 case TIOCSLTC:
978 return set_ltchars(real_tty, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979#endif
Alan Cox355d95a2008-02-08 04:18:48 -0800980 case TCSETSF:
981 return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD);
982 case TCSETSW:
983 return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD);
984 case TCSETS:
985 return set_termios(real_tty, p, TERMIOS_OLD);
Alan Coxedc6afc2006-12-08 02:38:44 -0800986#ifndef TCGETS2
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((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 Coxedc6afc2006-12-08 02:38:44 -0800992#else
Alan Cox355d95a2008-02-08 04:18:48 -0800993 case TCGETS:
Alan Cox26a2e202009-06-11 14:03:13 +0100994 copy_termios(real_tty, &kterm);
995 if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +0100996 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +0100997 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -0800998 case TCGETS2:
Alan Cox26a2e202009-06-11 14:03:13 +0100999 copy_termios(real_tty, &kterm);
1000 if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +01001001 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001002 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001003 case TCSETSF2:
1004 return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT);
1005 case TCSETSW2:
1006 return set_termios(real_tty, p, TERMIOS_WAIT);
1007 case TCSETS2:
1008 return set_termios(real_tty, p, 0);
Alan Coxedc6afc2006-12-08 02:38:44 -08001009#endif
Alan Cox355d95a2008-02-08 04:18:48 -08001010 case TCGETA:
1011 return get_termio(real_tty, p);
1012 case TCSETAF:
1013 return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
1014 case TCSETAW:
1015 return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
1016 case TCSETA:
1017 return set_termios(real_tty, p, TERMIOS_TERMIO);
Alan Cox0fc00e22007-11-07 01:24:56 -08001018#ifndef TCGETS2
Alan Cox355d95a2008-02-08 04:18:48 -08001019 case TIOCGLCKTRMIOS:
Alan Cox26a2e202009-06-11 14:03:13 +01001020 copy_termios_locked(real_tty, &kterm);
1021 if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +01001022 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001023 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001024 case TIOCSLCKTRMIOS:
1025 if (!capable(CAP_SYS_ADMIN))
1026 return -EPERM;
Alan Cox26a2e202009-06-11 14:03:13 +01001027 copy_termios_locked(real_tty, &kterm);
1028 if (user_termios_to_kernel_termios(&kterm,
Alan Cox355d95a2008-02-08 04:18:48 -08001029 (struct termios __user *) arg))
Alan Cox26a2e202009-06-11 14:03:13 +01001030 return -EFAULT;
1031 mutex_lock(&real_tty->termios_mutex);
1032 memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios));
Alan Cox8f520022008-10-13 10:38:46 +01001033 mutex_unlock(&real_tty->termios_mutex);
Alan Cox26a2e202009-06-11 14:03:13 +01001034 return 0;
Alan Cox0fc00e22007-11-07 01:24:56 -08001035#else
Alan Cox355d95a2008-02-08 04:18:48 -08001036 case TIOCGLCKTRMIOS:
Alan Cox26a2e202009-06-11 14:03:13 +01001037 copy_termios_locked(real_tty, &kterm);
1038 if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm))
Alan Cox8f520022008-10-13 10:38:46 +01001039 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001040 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001041 case TIOCSLCKTRMIOS:
1042 if (!capable(CAP_SYS_ADMIN))
Alan Cox26a2e202009-06-11 14:03:13 +01001043 return -EPERM;
1044 copy_termios_locked(real_tty, &kterm);
1045 if (user_termios_to_kernel_termios_1(&kterm,
Alan Cox355d95a2008-02-08 04:18:48 -08001046 (struct termios __user *) arg))
Alan Cox26a2e202009-06-11 14:03:13 +01001047 return -EFAULT;
1048 mutex_lock(&real_tty->termios_mutex);
1049 memcpy(real_tty->termios_locked, &kterm, sizeof(struct ktermios));
Alan Cox8f520022008-10-13 10:38:46 +01001050 mutex_unlock(&real_tty->termios_mutex);
1051 return ret;
Alan Cox0fc00e22007-11-07 01:24:56 -08001052#endif
Alan Cox1d65b4a2008-10-13 10:38:18 +01001053#ifdef TCGETX
Mike Frysinger5dca6072009-06-16 17:01:02 +01001054 case TCGETX: {
1055 struct termiox ktermx;
Alan Cox1d65b4a2008-10-13 10:38:18 +01001056 if (real_tty->termiox == NULL)
1057 return -EINVAL;
Alan Cox8f520022008-10-13 10:38:46 +01001058 mutex_lock(&real_tty->termios_mutex);
Alan Cox26a2e202009-06-11 14:03:13 +01001059 memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox));
Alan Cox8f520022008-10-13 10:38:46 +01001060 mutex_unlock(&real_tty->termios_mutex);
Alan Cox26a2e202009-06-11 14:03:13 +01001061 if (copy_to_user(p, &ktermx, sizeof(struct termiox)))
1062 ret = -EFAULT;
Alan Cox8f520022008-10-13 10:38:46 +01001063 return ret;
Mike Frysinger5dca6072009-06-16 17:01:02 +01001064 }
Alan Cox1d65b4a2008-10-13 10:38:18 +01001065 case TCSETX:
1066 return set_termiox(real_tty, p, 0);
1067 case TCSETXW:
1068 return set_termiox(real_tty, p, TERMIOS_WAIT);
1069 case TCSETXF:
1070 return set_termiox(real_tty, p, TERMIOS_FLUSH);
1071#endif
Alan Cox355d95a2008-02-08 04:18:48 -08001072 case TIOCGSOFTCAR:
Alan Cox26a2e202009-06-11 14:03:13 +01001073 copy_termios(real_tty, &kterm);
1074 ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0,
Alan Cox355d95a2008-02-08 04:18:48 -08001075 (int __user *)arg);
Alan Cox8f520022008-10-13 10:38:46 +01001076 return ret;
Alan Cox355d95a2008-02-08 04:18:48 -08001077 case TIOCSSOFTCAR:
1078 if (get_user(arg, (unsigned int __user *) arg))
1079 return -EFAULT;
Alan Coxf753f322008-08-26 19:52:47 +01001080 return tty_change_softcar(real_tty, arg);
Alan Cox355d95a2008-02-08 04:18:48 -08001081 default:
1082 return -ENOIOCTLCMD;
Alan Cox0fc00e22007-11-07 01:24:56 -08001083 }
1084}
Alan Cox0fc00e22007-11-07 01:24:56 -08001085EXPORT_SYMBOL_GPL(tty_mode_ioctl);
1086
1087int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
1088{
1089 struct tty_ldisc *ld;
1090 int retval = tty_check_change(tty);
1091 if (retval)
1092 return retval;
1093
Alan Coxc0253ee2009-01-15 13:30:25 +00001094 ld = tty_ldisc_ref_wait(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001095 switch (arg) {
1096 case TCIFLUSH:
Alan Coxa352def2008-07-16 21:53:12 +01001097 if (ld && ld->ops->flush_buffer)
1098 ld->ops->flush_buffer(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001099 break;
1100 case TCIOFLUSH:
Alan Coxa352def2008-07-16 21:53:12 +01001101 if (ld && ld->ops->flush_buffer)
1102 ld->ops->flush_buffer(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001103 /* fall through */
1104 case TCOFLUSH:
Alan Coxf34d7a52008-04-30 00:54:13 -07001105 tty_driver_flush_buffer(tty);
Alan Cox0fc00e22007-11-07 01:24:56 -08001106 break;
1107 default:
1108 tty_ldisc_deref(ld);
1109 return -EINVAL;
1110 }
1111 tty_ldisc_deref(ld);
1112 return 0;
1113}
Alan Cox0fc00e22007-11-07 01:24:56 -08001114EXPORT_SYMBOL_GPL(tty_perform_flush);
1115
Alan Cox47afa7a2008-10-13 10:44:17 +01001116int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
Alan Cox0fc00e22007-11-07 01:24:56 -08001117 unsigned int cmd, unsigned long arg)
1118{
Alan Cox04f378b2008-04-30 00:53:29 -07001119 unsigned long flags;
Alan Cox0fc00e22007-11-07 01:24:56 -08001120 int retval;
1121
Alan Cox0fc00e22007-11-07 01:24:56 -08001122 switch (cmd) {
Alan Cox355d95a2008-02-08 04:18:48 -08001123 case TCXONC:
1124 retval = tty_check_change(tty);
1125 if (retval)
1126 return retval;
1127 switch (arg) {
1128 case TCOOFF:
1129 if (!tty->flow_stopped) {
1130 tty->flow_stopped = 1;
1131 stop_tty(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 }
Alan Cox355d95a2008-02-08 04:18:48 -08001133 break;
1134 case TCOON:
1135 if (tty->flow_stopped) {
1136 tty->flow_stopped = 0;
1137 start_tty(tty);
1138 }
1139 break;
1140 case TCIOFF:
1141 if (STOP_CHAR(tty) != __DISABLED_CHAR)
1142 return send_prio_char(tty, STOP_CHAR(tty));
1143 break;
1144 case TCION:
1145 if (START_CHAR(tty) != __DISABLED_CHAR)
1146 return send_prio_char(tty, START_CHAR(tty));
1147 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 default:
Alan Cox355d95a2008-02-08 04:18:48 -08001149 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 }
Alan Cox355d95a2008-02-08 04:18:48 -08001151 return 0;
1152 case TCFLSH:
1153 return tty_perform_flush(tty, arg);
Alan Cox355d95a2008-02-08 04:18:48 -08001154 case TIOCPKT:
1155 {
1156 int pktmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Alan Cox355d95a2008-02-08 04:18:48 -08001158 if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
1159 tty->driver->subtype != PTY_TYPE_MASTER)
1160 return -ENOTTY;
1161 if (get_user(pktmode, (int __user *) arg))
1162 return -EFAULT;
Alan Cox04f378b2008-04-30 00:53:29 -07001163 spin_lock_irqsave(&tty->ctrl_lock, flags);
Alan Cox355d95a2008-02-08 04:18:48 -08001164 if (pktmode) {
1165 if (!tty->packet) {
1166 tty->packet = 1;
1167 tty->link->ctrl_status = 0;
1168 }
1169 } else
1170 tty->packet = 0;
Alan Cox04f378b2008-04-30 00:53:29 -07001171 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
Alan Cox355d95a2008-02-08 04:18:48 -08001172 return 0;
1173 }
1174 default:
1175 /* Try the mode commands */
1176 return tty_mode_ioctl(tty, file, cmd, arg);
1177 }
1178}
Alan Cox47afa7a2008-10-13 10:44:17 +01001179EXPORT_SYMBOL(n_tty_ioctl_helper);