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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
3 | * | |
4 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines | |
5 | * which can be dynamically activated and de-activated by the line | |
6 | * discipline handling modules (like SLIP). | |
7 | */ | |
8 | ||
9 | #include <linux/types.h> | |
10 | #include <linux/termios.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/major.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/fcntl.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/bitops.h> | |
5785c95b | 21 | #include <linux/mutex.h> |
8193c429 | 22 | #include <linux/compat.h> |
1da177e4 LT |
23 | |
24 | #include <asm/io.h> | |
25 | #include <asm/uaccess.h> | |
1da177e4 LT |
26 | |
27 | #undef TTY_DEBUG_WAIT_UNTIL_SENT | |
28 | ||
29 | #undef DEBUG | |
30 | ||
31 | /* | |
32 | * Internal flag options for termios setting behavior | |
33 | */ | |
34 | #define TERMIOS_FLUSH 1 | |
35 | #define TERMIOS_WAIT 2 | |
36 | #define TERMIOS_TERMIO 4 | |
edc6afc5 | 37 | #define TERMIOS_OLD 8 |
1da177e4 | 38 | |
af9b897e | 39 | |
d81ed103 AC |
40 | /** |
41 | * tty_chars_in_buffer - characters pending | |
42 | * @tty: terminal | |
43 | * | |
44 | * Return the number of bytes of data in the device private | |
45 | * output queue. If no private method is supplied there is assumed | |
46 | * to be no queue on the device. | |
47 | */ | |
48 | ||
f34d7a5b AC |
49 | int tty_chars_in_buffer(struct tty_struct *tty) |
50 | { | |
51 | if (tty->ops->chars_in_buffer) | |
52 | return tty->ops->chars_in_buffer(tty); | |
53 | else | |
54 | return 0; | |
55 | } | |
f34d7a5b AC |
56 | EXPORT_SYMBOL(tty_chars_in_buffer); |
57 | ||
d81ed103 AC |
58 | /** |
59 | * tty_write_room - write queue space | |
60 | * @tty: terminal | |
61 | * | |
62 | * Return the number of bytes that can be queued to this device | |
63 | * at the present time. The result should be treated as a guarantee | |
64 | * and the driver cannot offer a value it later shrinks by more than | |
65 | * the number of bytes written. If no method is provided 2K is always | |
66 | * returned and data may be lost as there will be no flow control. | |
67 | */ | |
68 | ||
f34d7a5b AC |
69 | int tty_write_room(struct tty_struct *tty) |
70 | { | |
71 | if (tty->ops->write_room) | |
72 | return tty->ops->write_room(tty); | |
73 | return 2048; | |
74 | } | |
f34d7a5b AC |
75 | EXPORT_SYMBOL(tty_write_room); |
76 | ||
d81ed103 AC |
77 | /** |
78 | * tty_driver_flush_buffer - discard internal buffer | |
79 | * @tty: terminal | |
80 | * | |
81 | * Discard the internal output buffer for this device. If no method | |
82 | * is provided then either the buffer cannot be hardware flushed or | |
83 | * there is no buffer driver side. | |
84 | */ | |
f34d7a5b AC |
85 | void tty_driver_flush_buffer(struct tty_struct *tty) |
86 | { | |
87 | if (tty->ops->flush_buffer) | |
88 | tty->ops->flush_buffer(tty); | |
89 | } | |
f34d7a5b AC |
90 | EXPORT_SYMBOL(tty_driver_flush_buffer); |
91 | ||
d81ed103 AC |
92 | /** |
93 | * tty_throttle - flow control | |
94 | * @tty: terminal | |
95 | * | |
96 | * Indicate that a tty should stop transmitting data down the stack. | |
6a1c0680 | 97 | * Takes the termios rwsem to protect against parallel throttle/unthrottle |
38db8979 AC |
98 | * and also to ensure the driver can consistently reference its own |
99 | * termios data at this point when implementing software flow control. | |
d81ed103 AC |
100 | */ |
101 | ||
39c2e60f AC |
102 | void tty_throttle(struct tty_struct *tty) |
103 | { | |
6a1c0680 | 104 | down_write(&tty->termios_rwsem); |
39c2e60f AC |
105 | /* check TTY_THROTTLED first so it indicates our state */ |
106 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && | |
107 | tty->ops->throttle) | |
108 | tty->ops->throttle(tty); | |
70bc1264 | 109 | tty->flow_change = 0; |
6a1c0680 | 110 | up_write(&tty->termios_rwsem); |
39c2e60f AC |
111 | } |
112 | EXPORT_SYMBOL(tty_throttle); | |
113 | ||
d81ed103 AC |
114 | /** |
115 | * tty_unthrottle - flow control | |
116 | * @tty: terminal | |
117 | * | |
118 | * Indicate that a tty may continue transmitting data down the stack. | |
6a1c0680 | 119 | * Takes the termios rwsem to protect against parallel throttle/unthrottle |
38db8979 AC |
120 | * and also to ensure the driver can consistently reference its own |
121 | * termios data at this point when implementing software flow control. | |
122 | * | |
123 | * Drivers should however remember that the stack can issue a throttle, | |
124 | * then change flow control method, then unthrottle. | |
d81ed103 AC |
125 | */ |
126 | ||
39c2e60f AC |
127 | void tty_unthrottle(struct tty_struct *tty) |
128 | { | |
6a1c0680 | 129 | down_write(&tty->termios_rwsem); |
39c2e60f AC |
130 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
131 | tty->ops->unthrottle) | |
132 | tty->ops->unthrottle(tty); | |
70bc1264 | 133 | tty->flow_change = 0; |
6a1c0680 | 134 | up_write(&tty->termios_rwsem); |
39c2e60f AC |
135 | } |
136 | EXPORT_SYMBOL(tty_unthrottle); | |
f34d7a5b | 137 | |
70bc1264 PH |
138 | /** |
139 | * tty_throttle_safe - flow control | |
140 | * @tty: terminal | |
141 | * | |
142 | * Similar to tty_throttle() but will only attempt throttle | |
143 | * if tty->flow_change is TTY_THROTTLE_SAFE. Prevents an accidental | |
144 | * throttle due to race conditions when throttling is conditional | |
145 | * on factors evaluated prior to throttling. | |
146 | * | |
147 | * Returns 0 if tty is throttled (or was already throttled) | |
148 | */ | |
149 | ||
150 | int tty_throttle_safe(struct tty_struct *tty) | |
151 | { | |
152 | int ret = 0; | |
153 | ||
d8c1f929 | 154 | mutex_lock(&tty->throttle_mutex); |
70bc1264 PH |
155 | if (!test_bit(TTY_THROTTLED, &tty->flags)) { |
156 | if (tty->flow_change != TTY_THROTTLE_SAFE) | |
157 | ret = 1; | |
158 | else { | |
579a00a5 | 159 | set_bit(TTY_THROTTLED, &tty->flags); |
70bc1264 PH |
160 | if (tty->ops->throttle) |
161 | tty->ops->throttle(tty); | |
162 | } | |
163 | } | |
d8c1f929 | 164 | mutex_unlock(&tty->throttle_mutex); |
70bc1264 PH |
165 | |
166 | return ret; | |
167 | } | |
168 | ||
169 | /** | |
170 | * tty_unthrottle_safe - flow control | |
171 | * @tty: terminal | |
172 | * | |
173 | * Similar to tty_unthrottle() but will only attempt unthrottle | |
174 | * if tty->flow_change is TTY_UNTHROTTLE_SAFE. Prevents an accidental | |
175 | * unthrottle due to race conditions when unthrottling is conditional | |
176 | * on factors evaluated prior to unthrottling. | |
177 | * | |
178 | * Returns 0 if tty is unthrottled (or was already unthrottled) | |
179 | */ | |
180 | ||
181 | int tty_unthrottle_safe(struct tty_struct *tty) | |
182 | { | |
183 | int ret = 0; | |
184 | ||
d8c1f929 | 185 | mutex_lock(&tty->throttle_mutex); |
70bc1264 PH |
186 | if (test_bit(TTY_THROTTLED, &tty->flags)) { |
187 | if (tty->flow_change != TTY_UNTHROTTLE_SAFE) | |
188 | ret = 1; | |
189 | else { | |
579a00a5 | 190 | clear_bit(TTY_THROTTLED, &tty->flags); |
70bc1264 PH |
191 | if (tty->ops->unthrottle) |
192 | tty->ops->unthrottle(tty); | |
193 | } | |
194 | } | |
d8c1f929 | 195 | mutex_unlock(&tty->throttle_mutex); |
70bc1264 PH |
196 | |
197 | return ret; | |
198 | } | |
199 | ||
af9b897e AC |
200 | /** |
201 | * tty_wait_until_sent - wait for I/O to finish | |
202 | * @tty: tty we are waiting for | |
203 | * @timeout: how long we will wait | |
204 | * | |
205 | * Wait for characters pending in a tty driver to hit the wire, or | |
206 | * for a timeout to occur (eg due to flow control) | |
207 | * | |
208 | * Locking: none | |
209 | */ | |
210 | ||
355d95a1 | 211 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
1da177e4 | 212 | { |
1da177e4 | 213 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
429b4749 | 214 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty)); |
1da177e4 | 215 | #endif |
1da177e4 LT |
216 | if (!timeout) |
217 | timeout = MAX_SCHEDULE_TIMEOUT; | |
79fbf4a5 | 218 | |
c37bc682 JH |
219 | timeout = wait_event_interruptible_timeout(tty->write_wait, |
220 | !tty_chars_in_buffer(tty), timeout); | |
221 | if (timeout <= 0) | |
79fbf4a5 | 222 | return; |
79fbf4a5 JH |
223 | |
224 | if (timeout == MAX_SCHEDULE_TIMEOUT) | |
225 | timeout = 0; | |
226 | ||
227 | if (tty->ops->wait_until_sent) | |
228 | tty->ops->wait_until_sent(tty, timeout); | |
1da177e4 | 229 | } |
1da177e4 LT |
230 | EXPORT_SYMBOL(tty_wait_until_sent); |
231 | ||
d81ed103 AC |
232 | |
233 | /* | |
234 | * Termios Helper Methods | |
235 | */ | |
236 | ||
edc6afc5 AC |
237 | static void unset_locked_termios(struct ktermios *termios, |
238 | struct ktermios *old, | |
239 | struct ktermios *locked) | |
1da177e4 LT |
240 | { |
241 | int i; | |
355d95a1 AC |
242 | |
243 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) | |
1da177e4 LT |
244 | |
245 | if (!locked) { | |
246 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
247 | return; | |
248 | } | |
249 | ||
250 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
251 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
252 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
253 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
254 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
355d95a1 | 255 | for (i = 0; i < NCCS; i++) |
1da177e4 LT |
256 | termios->c_cc[i] = locked->c_cc[i] ? |
257 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 258 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
259 | } |
260 | ||
edc6afc5 AC |
261 | /* |
262 | * Routine which returns the baud rate of the tty | |
263 | * | |
264 | * Note that the baud_table needs to be kept in sync with the | |
265 | * include/asm/termbits.h file. | |
266 | */ | |
267 | static const speed_t baud_table[] = { | |
268 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
269 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, | |
270 | #ifdef __sparc__ | |
271 | 76800, 153600, 307200, 614400, 921600 | |
272 | #else | |
273 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, | |
274 | 2500000, 3000000, 3500000, 4000000 | |
275 | #endif | |
276 | }; | |
277 | ||
278 | #ifndef __sparc__ | |
279 | static const tcflag_t baud_bits[] = { | |
280 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
281 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
282 | B57600, B115200, B230400, B460800, B500000, B576000, | |
283 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, | |
284 | B3000000, B3500000, B4000000 | |
285 | }; | |
286 | #else | |
287 | static const tcflag_t baud_bits[] = { | |
288 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
289 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
290 | B57600, B115200, B230400, B460800, B76800, B153600, | |
291 | B307200, B614400, B921600 | |
292 | }; | |
293 | #endif | |
294 | ||
295 | static int n_baud_table = ARRAY_SIZE(baud_table); | |
296 | ||
297 | /** | |
298 | * tty_termios_baud_rate | |
299 | * @termios: termios structure | |
300 | * | |
301 | * Convert termios baud rate data into a speed. This should be called | |
302 | * with the termios lock held if this termios is a terminal termios | |
303 | * structure. May change the termios data. Device drivers can call this | |
304 | * function but should use ->c_[io]speed directly as they are updated. | |
305 | * | |
306 | * Locking: none | |
307 | */ | |
308 | ||
309 | speed_t tty_termios_baud_rate(struct ktermios *termios) | |
310 | { | |
311 | unsigned int cbaud; | |
312 | ||
313 | cbaud = termios->c_cflag & CBAUD; | |
314 | ||
315 | #ifdef BOTHER | |
25985edc | 316 | /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ |
edc6afc5 AC |
317 | if (cbaud == BOTHER) |
318 | return termios->c_ospeed; | |
319 | #endif | |
320 | if (cbaud & CBAUDEX) { | |
321 | cbaud &= ~CBAUDEX; | |
322 | ||
323 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
324 | termios->c_cflag &= ~CBAUDEX; | |
325 | else | |
326 | cbaud += 15; | |
327 | } | |
328 | return baud_table[cbaud]; | |
329 | } | |
edc6afc5 AC |
330 | EXPORT_SYMBOL(tty_termios_baud_rate); |
331 | ||
332 | /** | |
333 | * tty_termios_input_baud_rate | |
334 | * @termios: termios structure | |
335 | * | |
336 | * Convert termios baud rate data into a speed. This should be called | |
337 | * with the termios lock held if this termios is a terminal termios | |
338 | * structure. May change the termios data. Device drivers can call this | |
339 | * function but should use ->c_[io]speed directly as they are updated. | |
340 | * | |
341 | * Locking: none | |
342 | */ | |
343 | ||
344 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) | |
345 | { | |
346 | #ifdef IBSHIFT | |
347 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; | |
348 | ||
349 | if (cbaud == B0) | |
350 | return tty_termios_baud_rate(termios); | |
351 | ||
25985edc | 352 | /* Magic token for arbitrary speed via c_ispeed*/ |
edc6afc5 AC |
353 | if (cbaud == BOTHER) |
354 | return termios->c_ispeed; | |
355 | ||
356 | if (cbaud & CBAUDEX) { | |
357 | cbaud &= ~CBAUDEX; | |
358 | ||
359 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
360 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); | |
361 | else | |
362 | cbaud += 15; | |
363 | } | |
364 | return baud_table[cbaud]; | |
365 | #else | |
366 | return tty_termios_baud_rate(termios); | |
367 | #endif | |
368 | } | |
edc6afc5 AC |
369 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
370 | ||
edc6afc5 AC |
371 | /** |
372 | * tty_termios_encode_baud_rate | |
78137e3b | 373 | * @termios: ktermios structure holding user requested state |
edc6afc5 AC |
374 | * @ispeed: input speed |
375 | * @ospeed: output speed | |
376 | * | |
377 | * Encode the speeds set into the passed termios structure. This is | |
f98e5b80 | 378 | * used as a library helper for drivers so that they can report back |
edc6afc5 AC |
379 | * the actual speed selected when it differs from the speed requested |
380 | * | |
78137e3b AC |
381 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
382 | * we need to carefully set the bits when the user does not get the | |
383 | * desired speed. We allow small margins and preserve as much of possible | |
06fe9fb4 | 384 | * of the input intent to keep compatibility. |
edc6afc5 AC |
385 | * |
386 | * Locking: Caller should hold termios lock. This is already held | |
387 | * when calling this function from the driver termios handler. | |
5f519d72 AC |
388 | * |
389 | * The ifdefs deal with platforms whose owners have yet to update them | |
390 | * and will all go away once this is done. | |
edc6afc5 AC |
391 | */ |
392 | ||
75e8b71d MR |
393 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
394 | speed_t ibaud, speed_t obaud) | |
edc6afc5 AC |
395 | { |
396 | int i = 0; | |
78137e3b AC |
397 | int ifound = -1, ofound = -1; |
398 | int iclose = ibaud/50, oclose = obaud/50; | |
399 | int ibinput = 0; | |
edc6afc5 | 400 | |
5f519d72 AC |
401 | if (obaud == 0) /* CD dropped */ |
402 | ibaud = 0; /* Clear ibaud to be sure */ | |
403 | ||
edc6afc5 AC |
404 | termios->c_ispeed = ibaud; |
405 | termios->c_ospeed = obaud; | |
406 | ||
5f519d72 | 407 | #ifdef BOTHER |
78137e3b | 408 | /* If the user asked for a precise weird speed give a precise weird |
a1d51aa2 | 409 | answer. If they asked for a Bfoo speed they may have problems |
78137e3b AC |
410 | digesting non-exact replies so fuzz a bit */ |
411 | ||
412 | if ((termios->c_cflag & CBAUD) == BOTHER) | |
413 | oclose = 0; | |
414 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) | |
415 | iclose = 0; | |
416 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) | |
417 | ibinput = 1; /* An input speed was specified */ | |
5f519d72 | 418 | #endif |
edc6afc5 | 419 | termios->c_cflag &= ~CBAUD; |
edc6afc5 | 420 | |
5f519d72 AC |
421 | /* |
422 | * Our goal is to find a close match to the standard baud rate | |
423 | * returned. Walk the baud rate table and if we get a very close | |
424 | * match then report back the speed as a POSIX Bxxxx value by | |
425 | * preference | |
426 | */ | |
427 | ||
edc6afc5 | 428 | do { |
75e8b71d MR |
429 | if (obaud - oclose <= baud_table[i] && |
430 | obaud + oclose >= baud_table[i]) { | |
edc6afc5 | 431 | termios->c_cflag |= baud_bits[i]; |
78137e3b | 432 | ofound = i; |
edc6afc5 | 433 | } |
75e8b71d MR |
434 | if (ibaud - iclose <= baud_table[i] && |
435 | ibaud + iclose >= baud_table[i]) { | |
436 | /* For the case input == output don't set IBAUD bits | |
437 | if the user didn't do so */ | |
5f519d72 AC |
438 | if (ofound == i && !ibinput) |
439 | ifound = i; | |
440 | #ifdef IBSHIFT | |
441 | else { | |
442 | ifound = i; | |
78137e3b | 443 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
5f519d72 AC |
444 | } |
445 | #endif | |
edc6afc5 | 446 | } |
6804396f | 447 | } while (++i < n_baud_table); |
5f519d72 AC |
448 | |
449 | /* | |
450 | * If we found no match then use BOTHER if provided or warn | |
451 | * the user their platform maintainer needs to wake up if not. | |
452 | */ | |
453 | #ifdef BOTHER | |
78137e3b | 454 | if (ofound == -1) |
edc6afc5 | 455 | termios->c_cflag |= BOTHER; |
78137e3b AC |
456 | /* Set exact input bits only if the input and output differ or the |
457 | user already did */ | |
6804396f | 458 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
edc6afc5 | 459 | termios->c_cflag |= (BOTHER << IBSHIFT); |
5f519d72 AC |
460 | #else |
461 | if (ifound == -1 || ofound == -1) { | |
9074d963 | 462 | printk_once(KERN_WARNING "tty: Unable to return correct " |
5f519d72 AC |
463 | "speed data as your architecture needs updating.\n"); |
464 | } | |
465 | #endif | |
edc6afc5 | 466 | } |
edc6afc5 AC |
467 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
468 | ||
d81ed103 AC |
469 | /** |
470 | * tty_encode_baud_rate - set baud rate of the tty | |
471 | * @ibaud: input baud rate | |
472 | * @obad: output baud rate | |
473 | * | |
474 | * Update the current termios data for the tty with the new speed | |
6a1c0680 | 475 | * settings. The caller must hold the termios_rwsem for the tty in |
d81ed103 AC |
476 | * question. |
477 | */ | |
478 | ||
5f519d72 AC |
479 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
480 | { | |
adc8d746 | 481 | tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud); |
5f519d72 AC |
482 | } |
483 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); | |
edc6afc5 | 484 | |
5f519d72 AC |
485 | /** |
486 | * tty_termios_copy_hw - copy hardware settings | |
487 | * @new: New termios | |
488 | * @old: Old termios | |
489 | * | |
25985edc | 490 | * Propagate the hardware specific terminal setting bits from |
5f519d72 AC |
491 | * the old termios structure to the new one. This is used in cases |
492 | * where the hardware does not support reconfiguration or as a helper | |
493 | * in some cases where only minimal reconfiguration is supported | |
494 | */ | |
495 | ||
496 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) | |
497 | { | |
498 | /* The bits a dumb device handles in software. Smart devices need | |
499 | to always provide a set_termios method */ | |
500 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
501 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
502 | new->c_ispeed = old->c_ispeed; | |
503 | new->c_ospeed = old->c_ospeed; | |
504 | } | |
5f519d72 AC |
505 | EXPORT_SYMBOL(tty_termios_copy_hw); |
506 | ||
bf5e5834 AC |
507 | /** |
508 | * tty_termios_hw_change - check for setting change | |
509 | * @a: termios | |
510 | * @b: termios to compare | |
511 | * | |
512 | * Check if any of the bits that affect a dumb device have changed | |
513 | * between the two termios structures, or a speed change is needed. | |
514 | */ | |
515 | ||
516 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) | |
517 | { | |
518 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) | |
519 | return 1; | |
520 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) | |
521 | return 1; | |
522 | return 0; | |
523 | } | |
524 | EXPORT_SYMBOL(tty_termios_hw_change); | |
525 | ||
af9b897e | 526 | /** |
8d075b19 | 527 | * tty_set_termios - update termios values |
af9b897e AC |
528 | * @tty: tty to update |
529 | * @new_termios: desired new value | |
530 | * | |
dbfcd851 | 531 | * Perform updates to the termios values set on this terminal. |
6460fbbf PH |
532 | * A master pty's termios should never be set. |
533 | * | |
6a1c0680 | 534 | * Locking: termios_rwsem |
af9b897e AC |
535 | */ |
536 | ||
b00f5c2d | 537 | int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) |
1da177e4 | 538 | { |
978e595f | 539 | struct ktermios old_termios; |
1da177e4 | 540 | struct tty_ldisc *ld; |
355d95a1 | 541 | |
6460fbbf PH |
542 | WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY && |
543 | tty->driver->subtype == PTY_TYPE_MASTER); | |
1da177e4 LT |
544 | /* |
545 | * Perform the actual termios internal changes under lock. | |
546 | */ | |
355d95a1 | 547 | |
1da177e4 LT |
548 | |
549 | /* FIXME: we need to decide on some locking/ordering semantics | |
550 | for the set_termios notification eventually */ | |
6a1c0680 | 551 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
552 | old_termios = tty->termios; |
553 | tty->termios = *new_termios; | |
554 | unset_locked_termios(&tty->termios, &old_termios, &tty->termios_locked); | |
1da177e4 | 555 | |
f34d7a5b | 556 | if (tty->ops->set_termios) |
c961bfb1 | 557 | tty->ops->set_termios(tty, &old_termios); |
5f519d72 | 558 | else |
adc8d746 | 559 | tty_termios_copy_hw(&tty->termios, &old_termios); |
1da177e4 LT |
560 | |
561 | ld = tty_ldisc_ref(tty); | |
562 | if (ld != NULL) { | |
a352def2 | 563 | if (ld->ops->set_termios) |
c961bfb1 | 564 | ld->ops->set_termios(tty, &old_termios); |
1da177e4 LT |
565 | tty_ldisc_deref(ld); |
566 | } | |
6a1c0680 | 567 | up_write(&tty->termios_rwsem); |
8d075b19 | 568 | return 0; |
1da177e4 | 569 | } |
b00f5c2d | 570 | EXPORT_SYMBOL_GPL(tty_set_termios); |
1da177e4 | 571 | |
af9b897e AC |
572 | /** |
573 | * set_termios - set termios values for a tty | |
574 | * @tty: terminal device | |
575 | * @arg: user data | |
576 | * @opt: option information | |
577 | * | |
3a4fa0a2 | 578 | * Helper function to prepare termios data and run necessary other |
8d075b19 | 579 | * functions before using tty_set_termios to do the actual changes. |
af9b897e AC |
580 | * |
581 | * Locking: | |
6a1c0680 | 582 | * Called functions take ldisc and termios_rwsem locks |
af9b897e AC |
583 | */ |
584 | ||
355d95a1 | 585 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
1da177e4 | 586 | { |
edc6afc5 | 587 | struct ktermios tmp_termios; |
1da177e4 LT |
588 | struct tty_ldisc *ld; |
589 | int retval = tty_check_change(tty); | |
590 | ||
591 | if (retval) | |
592 | return retval; | |
593 | ||
6a1c0680 | 594 | down_read(&tty->termios_rwsem); |
adc8d746 | 595 | tmp_termios = tty->termios; |
6a1c0680 | 596 | up_read(&tty->termios_rwsem); |
64bb6c5e | 597 | |
1da177e4 | 598 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
599 | if (user_termio_to_kernel_termios(&tmp_termios, |
600 | (struct termio __user *)arg)) | |
601 | return -EFAULT; | |
edc6afc5 AC |
602 | #ifdef TCGETS2 |
603 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 604 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 605 | (struct termios __user *)arg)) |
edc6afc5 | 606 | return -EFAULT; |
1da177e4 LT |
607 | } else { |
608 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 609 | (struct termios2 __user *)arg)) |
1da177e4 LT |
610 | return -EFAULT; |
611 | } | |
64bb6c5e AC |
612 | #else |
613 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
614 | (struct termios __user *)arg)) | |
615 | return -EFAULT; | |
616 | #endif | |
1da177e4 | 617 | |
355d95a1 AC |
618 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
619 | * with the real speed so its unconditionally usable */ | |
edc6afc5 AC |
620 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
621 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
622 | ||
1da177e4 | 623 | ld = tty_ldisc_ref(tty); |
355d95a1 | 624 | |
1da177e4 | 625 | if (ld != NULL) { |
a352def2 AC |
626 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
627 | ld->ops->flush_buffer(tty); | |
1da177e4 LT |
628 | tty_ldisc_deref(ld); |
629 | } | |
355d95a1 | 630 | |
1da177e4 LT |
631 | if (opt & TERMIOS_WAIT) { |
632 | tty_wait_until_sent(tty, 0); | |
633 | if (signal_pending(current)) | |
183d95cd | 634 | return -ERESTARTSYS; |
1da177e4 LT |
635 | } |
636 | ||
8d075b19 | 637 | tty_set_termios(tty, &tmp_termios); |
5f519d72 AC |
638 | |
639 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
640 | actual requested termios was not tmp_termios then we may | |
641 | want to return an error as no user requested change has | |
642 | succeeded */ | |
1da177e4 LT |
643 | return 0; |
644 | } | |
645 | ||
26a2e20f AC |
646 | static void copy_termios(struct tty_struct *tty, struct ktermios *kterm) |
647 | { | |
6a1c0680 | 648 | down_read(&tty->termios_rwsem); |
adc8d746 | 649 | *kterm = tty->termios; |
6a1c0680 | 650 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
651 | } |
652 | ||
653 | static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) | |
654 | { | |
6a1c0680 | 655 | down_read(&tty->termios_rwsem); |
adc8d746 | 656 | *kterm = tty->termios_locked; |
6a1c0680 | 657 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
658 | } |
659 | ||
355d95a1 | 660 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
1da177e4 | 661 | { |
26a2e20f AC |
662 | struct ktermios kterm; |
663 | copy_termios(tty, &kterm); | |
664 | if (kernel_termios_to_user_termio(termio, &kterm)) | |
1da177e4 LT |
665 | return -EFAULT; |
666 | return 0; | |
667 | } | |
668 | ||
1d65b4a0 AC |
669 | |
670 | #ifdef TCGETX | |
671 | ||
672 | /** | |
673 | * set_termiox - set termiox fields if possible | |
674 | * @tty: terminal | |
675 | * @arg: termiox structure from user | |
676 | * @opt: option flags for ioctl type | |
677 | * | |
678 | * Implement the device calling points for the SYS5 termiox ioctl | |
679 | * interface in Linux | |
680 | */ | |
681 | ||
682 | static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) | |
683 | { | |
684 | struct termiox tnew; | |
685 | struct tty_ldisc *ld; | |
686 | ||
687 | if (tty->termiox == NULL) | |
688 | return -EINVAL; | |
689 | if (copy_from_user(&tnew, arg, sizeof(struct termiox))) | |
690 | return -EFAULT; | |
691 | ||
692 | ld = tty_ldisc_ref(tty); | |
693 | if (ld != NULL) { | |
694 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) | |
695 | ld->ops->flush_buffer(tty); | |
696 | tty_ldisc_deref(ld); | |
697 | } | |
698 | if (opt & TERMIOS_WAIT) { | |
699 | tty_wait_until_sent(tty, 0); | |
700 | if (signal_pending(current)) | |
183d95cd | 701 | return -ERESTARTSYS; |
1d65b4a0 AC |
702 | } |
703 | ||
6a1c0680 | 704 | down_write(&tty->termios_rwsem); |
1d65b4a0 AC |
705 | if (tty->ops->set_termiox) |
706 | tty->ops->set_termiox(tty, &tnew); | |
6a1c0680 | 707 | up_write(&tty->termios_rwsem); |
1d65b4a0 AC |
708 | return 0; |
709 | } | |
710 | ||
711 | #endif | |
712 | ||
1da177e4 LT |
713 | |
714 | #ifdef TIOCGETP | |
715 | /* | |
716 | * These are deprecated, but there is limited support.. | |
717 | * | |
718 | * The "sg_flags" translation is a joke.. | |
719 | */ | |
355d95a1 | 720 | static int get_sgflags(struct tty_struct *tty) |
1da177e4 LT |
721 | { |
722 | int flags = 0; | |
723 | ||
adc8d746 AC |
724 | if (!(tty->termios.c_lflag & ICANON)) { |
725 | if (tty->termios.c_lflag & ISIG) | |
1da177e4 LT |
726 | flags |= 0x02; /* cbreak */ |
727 | else | |
728 | flags |= 0x20; /* raw */ | |
729 | } | |
adc8d746 | 730 | if (tty->termios.c_lflag & ECHO) |
1da177e4 | 731 | flags |= 0x08; /* echo */ |
adc8d746 AC |
732 | if (tty->termios.c_oflag & OPOST) |
733 | if (tty->termios.c_oflag & ONLCR) | |
1da177e4 LT |
734 | flags |= 0x10; /* crmod */ |
735 | return flags; | |
736 | } | |
737 | ||
355d95a1 | 738 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
739 | { |
740 | struct sgttyb tmp; | |
741 | ||
6a1c0680 | 742 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
743 | tmp.sg_ispeed = tty->termios.c_ispeed; |
744 | tmp.sg_ospeed = tty->termios.c_ospeed; | |
745 | tmp.sg_erase = tty->termios.c_cc[VERASE]; | |
746 | tmp.sg_kill = tty->termios.c_cc[VKILL]; | |
1da177e4 | 747 | tmp.sg_flags = get_sgflags(tty); |
6a1c0680 | 748 | up_read(&tty->termios_rwsem); |
355d95a1 | 749 | |
1da177e4 LT |
750 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
751 | } | |
752 | ||
355d95a1 | 753 | static void set_sgflags(struct ktermios *termios, int flags) |
1da177e4 | 754 | { |
9833facf AC |
755 | termios->c_iflag = ICRNL | IXON; |
756 | termios->c_oflag = 0; | |
757 | termios->c_lflag = ISIG | ICANON; | |
1da177e4 | 758 | if (flags & 0x02) { /* cbreak */ |
9833facf AC |
759 | termios->c_iflag = 0; |
760 | termios->c_lflag &= ~ICANON; | |
1da177e4 LT |
761 | } |
762 | if (flags & 0x08) { /* echo */ | |
9833facf | 763 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
1da177e4 LT |
764 | ECHOCTL | ECHOKE | IEXTEN; |
765 | } | |
766 | if (flags & 0x10) { /* crmod */ | |
9833facf | 767 | termios->c_oflag |= OPOST | ONLCR; |
1da177e4 LT |
768 | } |
769 | if (flags & 0x20) { /* raw */ | |
9833facf AC |
770 | termios->c_iflag = 0; |
771 | termios->c_lflag &= ~(ISIG | ICANON); | |
1da177e4 | 772 | } |
9833facf AC |
773 | if (!(termios->c_lflag & ICANON)) { |
774 | termios->c_cc[VMIN] = 1; | |
775 | termios->c_cc[VTIME] = 0; | |
1da177e4 LT |
776 | } |
777 | } | |
778 | ||
af9b897e AC |
779 | /** |
780 | * set_sgttyb - set legacy terminal values | |
781 | * @tty: tty structure | |
782 | * @sgttyb: pointer to old style terminal structure | |
783 | * | |
784 | * Updates a terminal from the legacy BSD style terminal information | |
785 | * structure. | |
786 | * | |
6a1c0680 | 787 | * Locking: termios_rwsem |
af9b897e AC |
788 | */ |
789 | ||
355d95a1 | 790 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
791 | { |
792 | int retval; | |
793 | struct sgttyb tmp; | |
edc6afc5 | 794 | struct ktermios termios; |
1da177e4 LT |
795 | |
796 | retval = tty_check_change(tty); | |
797 | if (retval) | |
798 | return retval; | |
355d95a1 | 799 | |
1da177e4 LT |
800 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
801 | return -EFAULT; | |
802 | ||
6a1c0680 | 803 | down_write(&tty->termios_rwsem); |
adc8d746 | 804 | termios = tty->termios; |
1da177e4 LT |
805 | termios.c_cc[VERASE] = tmp.sg_erase; |
806 | termios.c_cc[VKILL] = tmp.sg_kill; | |
807 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 AC |
808 | /* Try and encode into Bfoo format */ |
809 | #ifdef BOTHER | |
355d95a1 AC |
810 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
811 | termios.c_ospeed); | |
edc6afc5 | 812 | #endif |
6a1c0680 | 813 | up_write(&tty->termios_rwsem); |
8d075b19 | 814 | tty_set_termios(tty, &termios); |
1da177e4 LT |
815 | return 0; |
816 | } | |
817 | #endif | |
818 | ||
819 | #ifdef TIOCGETC | |
355d95a1 | 820 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
821 | { |
822 | struct tchars tmp; | |
823 | ||
6a1c0680 | 824 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
825 | tmp.t_intrc = tty->termios.c_cc[VINTR]; |
826 | tmp.t_quitc = tty->termios.c_cc[VQUIT]; | |
827 | tmp.t_startc = tty->termios.c_cc[VSTART]; | |
828 | tmp.t_stopc = tty->termios.c_cc[VSTOP]; | |
829 | tmp.t_eofc = tty->termios.c_cc[VEOF]; | |
830 | tmp.t_brkc = tty->termios.c_cc[VEOL2]; /* what is brkc anyway? */ | |
6a1c0680 | 831 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
832 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
833 | } | |
834 | ||
355d95a1 | 835 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
836 | { |
837 | struct tchars tmp; | |
838 | ||
839 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
840 | return -EFAULT; | |
6a1c0680 | 841 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
842 | tty->termios.c_cc[VINTR] = tmp.t_intrc; |
843 | tty->termios.c_cc[VQUIT] = tmp.t_quitc; | |
844 | tty->termios.c_cc[VSTART] = tmp.t_startc; | |
845 | tty->termios.c_cc[VSTOP] = tmp.t_stopc; | |
846 | tty->termios.c_cc[VEOF] = tmp.t_eofc; | |
847 | tty->termios.c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
6a1c0680 | 848 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
849 | return 0; |
850 | } | |
851 | #endif | |
852 | ||
853 | #ifdef TIOCGLTC | |
355d95a1 | 854 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
855 | { |
856 | struct ltchars tmp; | |
857 | ||
6a1c0680 | 858 | down_read(&tty->termios_rwsem); |
adc8d746 | 859 | tmp.t_suspc = tty->termios.c_cc[VSUSP]; |
355d95a1 | 860 | /* what is dsuspc anyway? */ |
adc8d746 AC |
861 | tmp.t_dsuspc = tty->termios.c_cc[VSUSP]; |
862 | tmp.t_rprntc = tty->termios.c_cc[VREPRINT]; | |
355d95a1 | 863 | /* what is flushc anyway? */ |
adc8d746 AC |
864 | tmp.t_flushc = tty->termios.c_cc[VEOL2]; |
865 | tmp.t_werasc = tty->termios.c_cc[VWERASE]; | |
866 | tmp.t_lnextc = tty->termios.c_cc[VLNEXT]; | |
6a1c0680 | 867 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
868 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
869 | } | |
870 | ||
355d95a1 | 871 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
872 | { |
873 | struct ltchars tmp; | |
874 | ||
875 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
876 | return -EFAULT; | |
877 | ||
6a1c0680 | 878 | down_write(&tty->termios_rwsem); |
adc8d746 | 879 | tty->termios.c_cc[VSUSP] = tmp.t_suspc; |
355d95a1 | 880 | /* what is dsuspc anyway? */ |
adc8d746 AC |
881 | tty->termios.c_cc[VEOL2] = tmp.t_dsuspc; |
882 | tty->termios.c_cc[VREPRINT] = tmp.t_rprntc; | |
355d95a1 | 883 | /* what is flushc anyway? */ |
adc8d746 AC |
884 | tty->termios.c_cc[VEOL2] = tmp.t_flushc; |
885 | tty->termios.c_cc[VWERASE] = tmp.t_werasc; | |
886 | tty->termios.c_cc[VLNEXT] = tmp.t_lnextc; | |
6a1c0680 | 887 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
888 | return 0; |
889 | } | |
890 | #endif | |
891 | ||
1c2630cc AC |
892 | /** |
893 | * tty_change_softcar - carrier change ioctl helper | |
894 | * @tty: tty to update | |
895 | * @arg: enable/disable CLOCAL | |
896 | * | |
897 | * Perform a change to the CLOCAL state and call into the driver | |
6a1c0680 | 898 | * layer to make it visible. All done with the termios rwsem |
1c2630cc AC |
899 | */ |
900 | ||
901 | static int tty_change_softcar(struct tty_struct *tty, int arg) | |
902 | { | |
903 | int ret = 0; | |
904 | int bit = arg ? CLOCAL : 0; | |
f34d7a5b | 905 | struct ktermios old; |
1c2630cc | 906 | |
6a1c0680 | 907 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
908 | old = tty->termios; |
909 | tty->termios.c_cflag &= ~CLOCAL; | |
910 | tty->termios.c_cflag |= bit; | |
f34d7a5b AC |
911 | if (tty->ops->set_termios) |
912 | tty->ops->set_termios(tty, &old); | |
adc8d746 | 913 | if ((tty->termios.c_cflag & CLOCAL) != bit) |
1c2630cc | 914 | ret = -EINVAL; |
6a1c0680 | 915 | up_write(&tty->termios_rwsem); |
1c2630cc AC |
916 | return ret; |
917 | } | |
918 | ||
0fc00e24 AC |
919 | /** |
920 | * tty_mode_ioctl - mode related ioctls | |
921 | * @tty: tty for the ioctl | |
922 | * @file: file pointer for the tty | |
923 | * @cmd: command | |
924 | * @arg: ioctl argument | |
925 | * | |
926 | * Perform non line discipline specific mode control ioctls. This | |
927 | * is designed to be called by line disciplines to ensure they provide | |
928 | * consistent mode setting. | |
929 | */ | |
930 | ||
355d95a1 | 931 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
0fc00e24 | 932 | unsigned int cmd, unsigned long arg) |
1da177e4 | 933 | { |
355d95a1 | 934 | struct tty_struct *real_tty; |
1da177e4 | 935 | void __user *p = (void __user *)arg; |
8f520021 | 936 | int ret = 0; |
26a2e20f | 937 | struct ktermios kterm; |
1da177e4 | 938 | |
8d075b19 AC |
939 | BUG_ON(file == NULL); |
940 | ||
1da177e4 LT |
941 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
942 | tty->driver->subtype == PTY_TYPE_MASTER) | |
943 | real_tty = tty->link; | |
944 | else | |
945 | real_tty = tty; | |
946 | ||
947 | switch (cmd) { | |
948 | #ifdef TIOCGETP | |
355d95a1 AC |
949 | case TIOCGETP: |
950 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
951 | case TIOCSETP: | |
952 | case TIOCSETN: | |
953 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1da177e4 LT |
954 | #endif |
955 | #ifdef TIOCGETC | |
355d95a1 AC |
956 | case TIOCGETC: |
957 | return get_tchars(real_tty, p); | |
958 | case TIOCSETC: | |
959 | return set_tchars(real_tty, p); | |
1da177e4 LT |
960 | #endif |
961 | #ifdef TIOCGLTC | |
355d95a1 AC |
962 | case TIOCGLTC: |
963 | return get_ltchars(real_tty, p); | |
964 | case TIOCSLTC: | |
965 | return set_ltchars(real_tty, p); | |
1da177e4 | 966 | #endif |
355d95a1 AC |
967 | case TCSETSF: |
968 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
969 | case TCSETSW: | |
970 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
971 | case TCSETS: | |
972 | return set_termios(real_tty, p, TERMIOS_OLD); | |
edc6afc5 | 973 | #ifndef TCGETS2 |
355d95a1 | 974 | case TCGETS: |
26a2e20f AC |
975 | copy_termios(real_tty, &kterm); |
976 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 977 | ret = -EFAULT; |
8f520021 | 978 | return ret; |
edc6afc5 | 979 | #else |
355d95a1 | 980 | case TCGETS: |
26a2e20f AC |
981 | copy_termios(real_tty, &kterm); |
982 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 983 | ret = -EFAULT; |
8f520021 | 984 | return ret; |
355d95a1 | 985 | case TCGETS2: |
26a2e20f AC |
986 | copy_termios(real_tty, &kterm); |
987 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) | |
8f520021 | 988 | ret = -EFAULT; |
8f520021 | 989 | return ret; |
355d95a1 AC |
990 | case TCSETSF2: |
991 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
992 | case TCSETSW2: | |
993 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
994 | case TCSETS2: | |
995 | return set_termios(real_tty, p, 0); | |
edc6afc5 | 996 | #endif |
355d95a1 AC |
997 | case TCGETA: |
998 | return get_termio(real_tty, p); | |
999 | case TCSETAF: | |
1000 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
1001 | case TCSETAW: | |
1002 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
1003 | case TCSETA: | |
1004 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
0fc00e24 | 1005 | #ifndef TCGETS2 |
355d95a1 | 1006 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1007 | copy_termios_locked(real_tty, &kterm); |
1008 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 1009 | ret = -EFAULT; |
8f520021 | 1010 | return ret; |
355d95a1 AC |
1011 | case TIOCSLCKTRMIOS: |
1012 | if (!capable(CAP_SYS_ADMIN)) | |
1013 | return -EPERM; | |
26a2e20f AC |
1014 | copy_termios_locked(real_tty, &kterm); |
1015 | if (user_termios_to_kernel_termios(&kterm, | |
355d95a1 | 1016 | (struct termios __user *) arg)) |
26a2e20f | 1017 | return -EFAULT; |
6a1c0680 | 1018 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 1019 | real_tty->termios_locked = kterm; |
6a1c0680 | 1020 | up_write(&real_tty->termios_rwsem); |
26a2e20f | 1021 | return 0; |
0fc00e24 | 1022 | #else |
355d95a1 | 1023 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1024 | copy_termios_locked(real_tty, &kterm); |
1025 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 1026 | ret = -EFAULT; |
8f520021 | 1027 | return ret; |
355d95a1 AC |
1028 | case TIOCSLCKTRMIOS: |
1029 | if (!capable(CAP_SYS_ADMIN)) | |
26a2e20f AC |
1030 | return -EPERM; |
1031 | copy_termios_locked(real_tty, &kterm); | |
1032 | if (user_termios_to_kernel_termios_1(&kterm, | |
355d95a1 | 1033 | (struct termios __user *) arg)) |
26a2e20f | 1034 | return -EFAULT; |
6a1c0680 | 1035 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 1036 | real_tty->termios_locked = kterm; |
6a1c0680 | 1037 | up_write(&real_tty->termios_rwsem); |
8f520021 | 1038 | return ret; |
0fc00e24 | 1039 | #endif |
1d65b4a0 | 1040 | #ifdef TCGETX |
5dca607b MF |
1041 | case TCGETX: { |
1042 | struct termiox ktermx; | |
1d65b4a0 AC |
1043 | if (real_tty->termiox == NULL) |
1044 | return -EINVAL; | |
6a1c0680 | 1045 | down_read(&real_tty->termios_rwsem); |
26a2e20f | 1046 | memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); |
6a1c0680 | 1047 | up_read(&real_tty->termios_rwsem); |
26a2e20f AC |
1048 | if (copy_to_user(p, &ktermx, sizeof(struct termiox))) |
1049 | ret = -EFAULT; | |
8f520021 | 1050 | return ret; |
5dca607b | 1051 | } |
1d65b4a0 AC |
1052 | case TCSETX: |
1053 | return set_termiox(real_tty, p, 0); | |
1054 | case TCSETXW: | |
1055 | return set_termiox(real_tty, p, TERMIOS_WAIT); | |
1056 | case TCSETXF: | |
1057 | return set_termiox(real_tty, p, TERMIOS_FLUSH); | |
1058 | #endif | |
355d95a1 | 1059 | case TIOCGSOFTCAR: |
26a2e20f AC |
1060 | copy_termios(real_tty, &kterm); |
1061 | ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, | |
355d95a1 | 1062 | (int __user *)arg); |
8f520021 | 1063 | return ret; |
355d95a1 AC |
1064 | case TIOCSSOFTCAR: |
1065 | if (get_user(arg, (unsigned int __user *) arg)) | |
1066 | return -EFAULT; | |
f753f327 | 1067 | return tty_change_softcar(real_tty, arg); |
355d95a1 AC |
1068 | default: |
1069 | return -ENOIOCTLCMD; | |
0fc00e24 AC |
1070 | } |
1071 | } | |
0fc00e24 AC |
1072 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
1073 | ||
e7f3880c PH |
1074 | |
1075 | /* Caller guarantees ldisc reference is held */ | |
1076 | static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
0fc00e24 | 1077 | { |
e7f3880c | 1078 | struct tty_ldisc *ld = tty->ldisc; |
0fc00e24 | 1079 | |
0fc00e24 AC |
1080 | switch (arg) { |
1081 | case TCIFLUSH: | |
a1bf9584 | 1082 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 1083 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
1084 | tty_unthrottle(tty); |
1085 | } | |
0fc00e24 AC |
1086 | break; |
1087 | case TCIOFLUSH: | |
a1bf9584 | 1088 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 1089 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
1090 | tty_unthrottle(tty); |
1091 | } | |
0fc00e24 AC |
1092 | /* fall through */ |
1093 | case TCOFLUSH: | |
f34d7a5b | 1094 | tty_driver_flush_buffer(tty); |
0fc00e24 AC |
1095 | break; |
1096 | default: | |
0fc00e24 AC |
1097 | return -EINVAL; |
1098 | } | |
0fc00e24 AC |
1099 | return 0; |
1100 | } | |
e7f3880c PH |
1101 | |
1102 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
1103 | { | |
1104 | struct tty_ldisc *ld; | |
1105 | int retval = tty_check_change(tty); | |
1106 | if (retval) | |
1107 | return retval; | |
1108 | ||
1109 | ld = tty_ldisc_ref_wait(tty); | |
1110 | retval = __tty_perform_flush(tty, arg); | |
1111 | if (ld) | |
1112 | tty_ldisc_deref(ld); | |
1113 | return retval; | |
1114 | } | |
0fc00e24 AC |
1115 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
1116 | ||
47afa7a5 | 1117 | int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
0fc00e24 AC |
1118 | unsigned int cmd, unsigned long arg) |
1119 | { | |
0fc00e24 AC |
1120 | int retval; |
1121 | ||
0fc00e24 | 1122 | switch (cmd) { |
355d95a1 AC |
1123 | case TCXONC: |
1124 | retval = tty_check_change(tty); | |
1125 | if (retval) | |
1126 | return retval; | |
1127 | switch (arg) { | |
1128 | case TCOOFF: | |
c545b66c | 1129 | spin_lock_irq(&tty->flow_lock); |
355d95a1 AC |
1130 | if (!tty->flow_stopped) { |
1131 | tty->flow_stopped = 1; | |
c545b66c | 1132 | __stop_tty(tty); |
1da177e4 | 1133 | } |
c545b66c | 1134 | spin_unlock_irq(&tty->flow_lock); |
355d95a1 AC |
1135 | break; |
1136 | case TCOON: | |
c545b66c | 1137 | spin_lock_irq(&tty->flow_lock); |
355d95a1 AC |
1138 | if (tty->flow_stopped) { |
1139 | tty->flow_stopped = 0; | |
c545b66c | 1140 | __start_tty(tty); |
355d95a1 | 1141 | } |
c545b66c | 1142 | spin_unlock_irq(&tty->flow_lock); |
355d95a1 AC |
1143 | break; |
1144 | case TCIOFF: | |
c274f6ef | 1145 | down_read(&tty->termios_rwsem); |
355d95a1 | 1146 | if (STOP_CHAR(tty) != __DISABLED_CHAR) |
c274f6ef PH |
1147 | retval = tty_send_xchar(tty, STOP_CHAR(tty)); |
1148 | up_read(&tty->termios_rwsem); | |
355d95a1 AC |
1149 | break; |
1150 | case TCION: | |
c274f6ef | 1151 | down_read(&tty->termios_rwsem); |
355d95a1 | 1152 | if (START_CHAR(tty) != __DISABLED_CHAR) |
c274f6ef PH |
1153 | retval = tty_send_xchar(tty, START_CHAR(tty)); |
1154 | up_read(&tty->termios_rwsem); | |
355d95a1 | 1155 | break; |
1da177e4 | 1156 | default: |
355d95a1 | 1157 | return -EINVAL; |
1da177e4 | 1158 | } |
c274f6ef | 1159 | return retval; |
355d95a1 | 1160 | case TCFLSH: |
5cec7bf6 PH |
1161 | retval = tty_check_change(tty); |
1162 | if (retval) | |
1163 | return retval; | |
e7f3880c | 1164 | return __tty_perform_flush(tty, arg); |
355d95a1 AC |
1165 | default: |
1166 | /* Try the mode commands */ | |
1167 | return tty_mode_ioctl(tty, file, cmd, arg); | |
1168 | } | |
1da177e4 | 1169 | } |
47afa7a5 | 1170 | EXPORT_SYMBOL(n_tty_ioctl_helper); |
8193c429 TM |
1171 | |
1172 | #ifdef CONFIG_COMPAT | |
1173 | long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, | |
1174 | unsigned int cmd, unsigned long arg) | |
1175 | { | |
1176 | switch (cmd) { | |
1177 | case TIOCGLCKTRMIOS: | |
1178 | case TIOCSLCKTRMIOS: | |
1179 | return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg)); | |
1180 | default: | |
1181 | return -ENOIOCTLCMD; | |
1182 | } | |
1183 | } | |
1184 | EXPORT_SYMBOL(n_tty_compat_ioctl_helper); | |
1185 | #endif | |
1186 |