Commit | Line | Data |
---|---|---|
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 LT |
213 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
214 | char buf[64]; | |
355d95a1 | 215 | |
1da177e4 LT |
216 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
217 | #endif | |
1da177e4 LT |
218 | if (!timeout) |
219 | timeout = MAX_SCHEDULE_TIMEOUT; | |
5a52bd4a | 220 | if (wait_event_interruptible_timeout(tty->write_wait, |
f34d7a5b AC |
221 | !tty_chars_in_buffer(tty), timeout) >= 0) { |
222 | if (tty->ops->wait_until_sent) | |
223 | tty->ops->wait_until_sent(tty, timeout); | |
0ee9cbb3 | 224 | } |
1da177e4 | 225 | } |
1da177e4 LT |
226 | EXPORT_SYMBOL(tty_wait_until_sent); |
227 | ||
d81ed103 AC |
228 | |
229 | /* | |
230 | * Termios Helper Methods | |
231 | */ | |
232 | ||
edc6afc5 AC |
233 | static void unset_locked_termios(struct ktermios *termios, |
234 | struct ktermios *old, | |
235 | struct ktermios *locked) | |
1da177e4 LT |
236 | { |
237 | int i; | |
355d95a1 AC |
238 | |
239 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) | |
1da177e4 LT |
240 | |
241 | if (!locked) { | |
242 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
243 | return; | |
244 | } | |
245 | ||
246 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
247 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
248 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
249 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
250 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
355d95a1 | 251 | for (i = 0; i < NCCS; i++) |
1da177e4 LT |
252 | termios->c_cc[i] = locked->c_cc[i] ? |
253 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 254 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
255 | } |
256 | ||
edc6afc5 AC |
257 | /* |
258 | * Routine which returns the baud rate of the tty | |
259 | * | |
260 | * Note that the baud_table needs to be kept in sync with the | |
261 | * include/asm/termbits.h file. | |
262 | */ | |
263 | static const speed_t baud_table[] = { | |
264 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
265 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, | |
266 | #ifdef __sparc__ | |
267 | 76800, 153600, 307200, 614400, 921600 | |
268 | #else | |
269 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, | |
270 | 2500000, 3000000, 3500000, 4000000 | |
271 | #endif | |
272 | }; | |
273 | ||
274 | #ifndef __sparc__ | |
275 | static const tcflag_t baud_bits[] = { | |
276 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
277 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
278 | B57600, B115200, B230400, B460800, B500000, B576000, | |
279 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, | |
280 | B3000000, B3500000, B4000000 | |
281 | }; | |
282 | #else | |
283 | static const tcflag_t baud_bits[] = { | |
284 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
285 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
286 | B57600, B115200, B230400, B460800, B76800, B153600, | |
287 | B307200, B614400, B921600 | |
288 | }; | |
289 | #endif | |
290 | ||
291 | static int n_baud_table = ARRAY_SIZE(baud_table); | |
292 | ||
293 | /** | |
294 | * tty_termios_baud_rate | |
295 | * @termios: termios structure | |
296 | * | |
297 | * Convert termios baud rate data into a speed. This should be called | |
298 | * with the termios lock held if this termios is a terminal termios | |
299 | * structure. May change the termios data. Device drivers can call this | |
300 | * function but should use ->c_[io]speed directly as they are updated. | |
301 | * | |
302 | * Locking: none | |
303 | */ | |
304 | ||
305 | speed_t tty_termios_baud_rate(struct ktermios *termios) | |
306 | { | |
307 | unsigned int cbaud; | |
308 | ||
309 | cbaud = termios->c_cflag & CBAUD; | |
310 | ||
311 | #ifdef BOTHER | |
25985edc | 312 | /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ |
edc6afc5 AC |
313 | if (cbaud == BOTHER) |
314 | return termios->c_ospeed; | |
315 | #endif | |
316 | if (cbaud & CBAUDEX) { | |
317 | cbaud &= ~CBAUDEX; | |
318 | ||
319 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
320 | termios->c_cflag &= ~CBAUDEX; | |
321 | else | |
322 | cbaud += 15; | |
323 | } | |
324 | return baud_table[cbaud]; | |
325 | } | |
edc6afc5 AC |
326 | EXPORT_SYMBOL(tty_termios_baud_rate); |
327 | ||
328 | /** | |
329 | * tty_termios_input_baud_rate | |
330 | * @termios: termios structure | |
331 | * | |
332 | * Convert termios baud rate data into a speed. This should be called | |
333 | * with the termios lock held if this termios is a terminal termios | |
334 | * structure. May change the termios data. Device drivers can call this | |
335 | * function but should use ->c_[io]speed directly as they are updated. | |
336 | * | |
337 | * Locking: none | |
338 | */ | |
339 | ||
340 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) | |
341 | { | |
342 | #ifdef IBSHIFT | |
343 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; | |
344 | ||
345 | if (cbaud == B0) | |
346 | return tty_termios_baud_rate(termios); | |
347 | ||
25985edc | 348 | /* Magic token for arbitrary speed via c_ispeed*/ |
edc6afc5 AC |
349 | if (cbaud == BOTHER) |
350 | return termios->c_ispeed; | |
351 | ||
352 | if (cbaud & CBAUDEX) { | |
353 | cbaud &= ~CBAUDEX; | |
354 | ||
355 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
356 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); | |
357 | else | |
358 | cbaud += 15; | |
359 | } | |
360 | return baud_table[cbaud]; | |
361 | #else | |
362 | return tty_termios_baud_rate(termios); | |
363 | #endif | |
364 | } | |
edc6afc5 AC |
365 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
366 | ||
edc6afc5 AC |
367 | /** |
368 | * tty_termios_encode_baud_rate | |
78137e3b | 369 | * @termios: ktermios structure holding user requested state |
edc6afc5 AC |
370 | * @ispeed: input speed |
371 | * @ospeed: output speed | |
372 | * | |
373 | * Encode the speeds set into the passed termios structure. This is | |
f98e5b80 | 374 | * used as a library helper for drivers so that they can report back |
edc6afc5 AC |
375 | * the actual speed selected when it differs from the speed requested |
376 | * | |
78137e3b AC |
377 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
378 | * we need to carefully set the bits when the user does not get the | |
379 | * desired speed. We allow small margins and preserve as much of possible | |
06fe9fb4 | 380 | * of the input intent to keep compatibility. |
edc6afc5 AC |
381 | * |
382 | * Locking: Caller should hold termios lock. This is already held | |
383 | * when calling this function from the driver termios handler. | |
5f519d72 AC |
384 | * |
385 | * The ifdefs deal with platforms whose owners have yet to update them | |
386 | * and will all go away once this is done. | |
edc6afc5 AC |
387 | */ |
388 | ||
75e8b71d MR |
389 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
390 | speed_t ibaud, speed_t obaud) | |
edc6afc5 AC |
391 | { |
392 | int i = 0; | |
78137e3b AC |
393 | int ifound = -1, ofound = -1; |
394 | int iclose = ibaud/50, oclose = obaud/50; | |
395 | int ibinput = 0; | |
edc6afc5 | 396 | |
5f519d72 AC |
397 | if (obaud == 0) /* CD dropped */ |
398 | ibaud = 0; /* Clear ibaud to be sure */ | |
399 | ||
edc6afc5 AC |
400 | termios->c_ispeed = ibaud; |
401 | termios->c_ospeed = obaud; | |
402 | ||
5f519d72 | 403 | #ifdef BOTHER |
78137e3b AC |
404 | /* If the user asked for a precise weird speed give a precise weird |
405 | answer. If they asked for a Bfoo speed they many have problems | |
406 | digesting non-exact replies so fuzz a bit */ | |
407 | ||
408 | if ((termios->c_cflag & CBAUD) == BOTHER) | |
409 | oclose = 0; | |
410 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) | |
411 | iclose = 0; | |
412 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) | |
413 | ibinput = 1; /* An input speed was specified */ | |
5f519d72 | 414 | #endif |
edc6afc5 | 415 | termios->c_cflag &= ~CBAUD; |
edc6afc5 | 416 | |
5f519d72 AC |
417 | /* |
418 | * Our goal is to find a close match to the standard baud rate | |
419 | * returned. Walk the baud rate table and if we get a very close | |
420 | * match then report back the speed as a POSIX Bxxxx value by | |
421 | * preference | |
422 | */ | |
423 | ||
edc6afc5 | 424 | do { |
75e8b71d MR |
425 | if (obaud - oclose <= baud_table[i] && |
426 | obaud + oclose >= baud_table[i]) { | |
edc6afc5 | 427 | termios->c_cflag |= baud_bits[i]; |
78137e3b | 428 | ofound = i; |
edc6afc5 | 429 | } |
75e8b71d MR |
430 | if (ibaud - iclose <= baud_table[i] && |
431 | ibaud + iclose >= baud_table[i]) { | |
432 | /* For the case input == output don't set IBAUD bits | |
433 | if the user didn't do so */ | |
5f519d72 AC |
434 | if (ofound == i && !ibinput) |
435 | ifound = i; | |
436 | #ifdef IBSHIFT | |
437 | else { | |
438 | ifound = i; | |
78137e3b | 439 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
5f519d72 AC |
440 | } |
441 | #endif | |
edc6afc5 | 442 | } |
6804396f | 443 | } while (++i < n_baud_table); |
5f519d72 AC |
444 | |
445 | /* | |
446 | * If we found no match then use BOTHER if provided or warn | |
447 | * the user their platform maintainer needs to wake up if not. | |
448 | */ | |
449 | #ifdef BOTHER | |
78137e3b | 450 | if (ofound == -1) |
edc6afc5 | 451 | termios->c_cflag |= BOTHER; |
78137e3b AC |
452 | /* Set exact input bits only if the input and output differ or the |
453 | user already did */ | |
6804396f | 454 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
edc6afc5 | 455 | termios->c_cflag |= (BOTHER << IBSHIFT); |
5f519d72 AC |
456 | #else |
457 | if (ifound == -1 || ofound == -1) { | |
9074d963 | 458 | printk_once(KERN_WARNING "tty: Unable to return correct " |
5f519d72 AC |
459 | "speed data as your architecture needs updating.\n"); |
460 | } | |
461 | #endif | |
edc6afc5 | 462 | } |
edc6afc5 AC |
463 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
464 | ||
d81ed103 AC |
465 | /** |
466 | * tty_encode_baud_rate - set baud rate of the tty | |
467 | * @ibaud: input baud rate | |
468 | * @obad: output baud rate | |
469 | * | |
470 | * Update the current termios data for the tty with the new speed | |
6a1c0680 | 471 | * settings. The caller must hold the termios_rwsem for the tty in |
d81ed103 AC |
472 | * question. |
473 | */ | |
474 | ||
5f519d72 AC |
475 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
476 | { | |
adc8d746 | 477 | tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud); |
5f519d72 AC |
478 | } |
479 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); | |
edc6afc5 | 480 | |
5f519d72 AC |
481 | /** |
482 | * tty_termios_copy_hw - copy hardware settings | |
483 | * @new: New termios | |
484 | * @old: Old termios | |
485 | * | |
25985edc | 486 | * Propagate the hardware specific terminal setting bits from |
5f519d72 AC |
487 | * the old termios structure to the new one. This is used in cases |
488 | * where the hardware does not support reconfiguration or as a helper | |
489 | * in some cases where only minimal reconfiguration is supported | |
490 | */ | |
491 | ||
492 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) | |
493 | { | |
494 | /* The bits a dumb device handles in software. Smart devices need | |
495 | to always provide a set_termios method */ | |
496 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
497 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
498 | new->c_ispeed = old->c_ispeed; | |
499 | new->c_ospeed = old->c_ospeed; | |
500 | } | |
5f519d72 AC |
501 | EXPORT_SYMBOL(tty_termios_copy_hw); |
502 | ||
bf5e5834 AC |
503 | /** |
504 | * tty_termios_hw_change - check for setting change | |
505 | * @a: termios | |
506 | * @b: termios to compare | |
507 | * | |
508 | * Check if any of the bits that affect a dumb device have changed | |
509 | * between the two termios structures, or a speed change is needed. | |
510 | */ | |
511 | ||
512 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) | |
513 | { | |
514 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) | |
515 | return 1; | |
516 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) | |
517 | return 1; | |
518 | return 0; | |
519 | } | |
520 | EXPORT_SYMBOL(tty_termios_hw_change); | |
521 | ||
af9b897e | 522 | /** |
8d075b19 | 523 | * tty_set_termios - update termios values |
af9b897e AC |
524 | * @tty: tty to update |
525 | * @new_termios: desired new value | |
526 | * | |
527 | * Perform updates to the termios values set on this terminal. There | |
528 | * is a bit of layering violation here with n_tty in terms of the | |
529 | * internal knowledge of this function. | |
530 | * | |
6a1c0680 | 531 | * Locking: termios_rwsem |
af9b897e AC |
532 | */ |
533 | ||
8d075b19 | 534 | int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) |
1da177e4 | 535 | { |
978e595f | 536 | struct ktermios old_termios; |
1da177e4 | 537 | struct tty_ldisc *ld; |
04f378b1 | 538 | unsigned long flags; |
355d95a1 | 539 | |
1da177e4 LT |
540 | /* |
541 | * Perform the actual termios internal changes under lock. | |
542 | */ | |
355d95a1 | 543 | |
1da177e4 LT |
544 | |
545 | /* FIXME: we need to decide on some locking/ordering semantics | |
546 | for the set_termios notification eventually */ | |
6a1c0680 | 547 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
548 | old_termios = tty->termios; |
549 | tty->termios = *new_termios; | |
550 | unset_locked_termios(&tty->termios, &old_termios, &tty->termios_locked); | |
1da177e4 LT |
551 | |
552 | /* See if packet mode change of state. */ | |
1da177e4 | 553 | if (tty->link && tty->link->packet) { |
26df6d13 | 554 | int extproc = (old_termios.c_lflag & EXTPROC) | |
adc8d746 | 555 | (tty->termios.c_lflag & EXTPROC); |
1da177e4 LT |
556 | int old_flow = ((old_termios.c_iflag & IXON) && |
557 | (old_termios.c_cc[VSTOP] == '\023') && | |
558 | (old_termios.c_cc[VSTART] == '\021')); | |
559 | int new_flow = (I_IXON(tty) && | |
560 | STOP_CHAR(tty) == '\023' && | |
561 | START_CHAR(tty) == '\021'); | |
26df6d13 | 562 | if ((old_flow != new_flow) || extproc) { |
04f378b1 | 563 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
26df6d13 | 564 | if (old_flow != new_flow) { |
565 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); | |
566 | if (new_flow) | |
567 | tty->ctrl_status |= TIOCPKT_DOSTOP; | |
568 | else | |
569 | tty->ctrl_status |= TIOCPKT_NOSTOP; | |
570 | } | |
571 | if (extproc) | |
572 | tty->ctrl_status |= TIOCPKT_IOCTL; | |
04f378b1 | 573 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
1da177e4 LT |
574 | wake_up_interruptible(&tty->link->read_wait); |
575 | } | |
576 | } | |
355d95a1 | 577 | |
f34d7a5b AC |
578 | if (tty->ops->set_termios) |
579 | (*tty->ops->set_termios)(tty, &old_termios); | |
5f519d72 | 580 | else |
adc8d746 | 581 | tty_termios_copy_hw(&tty->termios, &old_termios); |
1da177e4 LT |
582 | |
583 | ld = tty_ldisc_ref(tty); | |
584 | if (ld != NULL) { | |
a352def2 AC |
585 | if (ld->ops->set_termios) |
586 | (ld->ops->set_termios)(tty, &old_termios); | |
1da177e4 LT |
587 | tty_ldisc_deref(ld); |
588 | } | |
6a1c0680 | 589 | up_write(&tty->termios_rwsem); |
8d075b19 | 590 | return 0; |
1da177e4 | 591 | } |
8d075b19 | 592 | EXPORT_SYMBOL_GPL(tty_set_termios); |
1da177e4 | 593 | |
af9b897e AC |
594 | /** |
595 | * set_termios - set termios values for a tty | |
596 | * @tty: terminal device | |
597 | * @arg: user data | |
598 | * @opt: option information | |
599 | * | |
3a4fa0a2 | 600 | * Helper function to prepare termios data and run necessary other |
8d075b19 | 601 | * functions before using tty_set_termios to do the actual changes. |
af9b897e AC |
602 | * |
603 | * Locking: | |
6a1c0680 | 604 | * Called functions take ldisc and termios_rwsem locks |
af9b897e AC |
605 | */ |
606 | ||
355d95a1 | 607 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
1da177e4 | 608 | { |
edc6afc5 | 609 | struct ktermios tmp_termios; |
1da177e4 LT |
610 | struct tty_ldisc *ld; |
611 | int retval = tty_check_change(tty); | |
612 | ||
613 | if (retval) | |
614 | return retval; | |
615 | ||
6a1c0680 | 616 | down_read(&tty->termios_rwsem); |
adc8d746 | 617 | tmp_termios = tty->termios; |
6a1c0680 | 618 | up_read(&tty->termios_rwsem); |
64bb6c5e | 619 | |
1da177e4 | 620 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
621 | if (user_termio_to_kernel_termios(&tmp_termios, |
622 | (struct termio __user *)arg)) | |
623 | return -EFAULT; | |
edc6afc5 AC |
624 | #ifdef TCGETS2 |
625 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 626 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 627 | (struct termios __user *)arg)) |
edc6afc5 | 628 | return -EFAULT; |
1da177e4 LT |
629 | } else { |
630 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 631 | (struct termios2 __user *)arg)) |
1da177e4 LT |
632 | return -EFAULT; |
633 | } | |
64bb6c5e AC |
634 | #else |
635 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
636 | (struct termios __user *)arg)) | |
637 | return -EFAULT; | |
638 | #endif | |
1da177e4 | 639 | |
355d95a1 AC |
640 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
641 | * with the real speed so its unconditionally usable */ | |
edc6afc5 AC |
642 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
643 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
644 | ||
1da177e4 | 645 | ld = tty_ldisc_ref(tty); |
355d95a1 | 646 | |
1da177e4 | 647 | if (ld != NULL) { |
a352def2 AC |
648 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
649 | ld->ops->flush_buffer(tty); | |
1da177e4 LT |
650 | tty_ldisc_deref(ld); |
651 | } | |
355d95a1 | 652 | |
1da177e4 LT |
653 | if (opt & TERMIOS_WAIT) { |
654 | tty_wait_until_sent(tty, 0); | |
655 | if (signal_pending(current)) | |
183d95cd | 656 | return -ERESTARTSYS; |
1da177e4 LT |
657 | } |
658 | ||
8d075b19 | 659 | tty_set_termios(tty, &tmp_termios); |
5f519d72 AC |
660 | |
661 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
662 | actual requested termios was not tmp_termios then we may | |
663 | want to return an error as no user requested change has | |
664 | succeeded */ | |
1da177e4 LT |
665 | return 0; |
666 | } | |
667 | ||
26a2e20f AC |
668 | static void copy_termios(struct tty_struct *tty, struct ktermios *kterm) |
669 | { | |
6a1c0680 | 670 | down_read(&tty->termios_rwsem); |
adc8d746 | 671 | *kterm = tty->termios; |
6a1c0680 | 672 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
673 | } |
674 | ||
675 | static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) | |
676 | { | |
6a1c0680 | 677 | down_read(&tty->termios_rwsem); |
adc8d746 | 678 | *kterm = tty->termios_locked; |
6a1c0680 | 679 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
680 | } |
681 | ||
355d95a1 | 682 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
1da177e4 | 683 | { |
26a2e20f AC |
684 | struct ktermios kterm; |
685 | copy_termios(tty, &kterm); | |
686 | if (kernel_termios_to_user_termio(termio, &kterm)) | |
1da177e4 LT |
687 | return -EFAULT; |
688 | return 0; | |
689 | } | |
690 | ||
1d65b4a0 AC |
691 | |
692 | #ifdef TCGETX | |
693 | ||
694 | /** | |
695 | * set_termiox - set termiox fields if possible | |
696 | * @tty: terminal | |
697 | * @arg: termiox structure from user | |
698 | * @opt: option flags for ioctl type | |
699 | * | |
700 | * Implement the device calling points for the SYS5 termiox ioctl | |
701 | * interface in Linux | |
702 | */ | |
703 | ||
704 | static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) | |
705 | { | |
706 | struct termiox tnew; | |
707 | struct tty_ldisc *ld; | |
708 | ||
709 | if (tty->termiox == NULL) | |
710 | return -EINVAL; | |
711 | if (copy_from_user(&tnew, arg, sizeof(struct termiox))) | |
712 | return -EFAULT; | |
713 | ||
714 | ld = tty_ldisc_ref(tty); | |
715 | if (ld != NULL) { | |
716 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) | |
717 | ld->ops->flush_buffer(tty); | |
718 | tty_ldisc_deref(ld); | |
719 | } | |
720 | if (opt & TERMIOS_WAIT) { | |
721 | tty_wait_until_sent(tty, 0); | |
722 | if (signal_pending(current)) | |
183d95cd | 723 | return -ERESTARTSYS; |
1d65b4a0 AC |
724 | } |
725 | ||
6a1c0680 | 726 | down_write(&tty->termios_rwsem); |
1d65b4a0 AC |
727 | if (tty->ops->set_termiox) |
728 | tty->ops->set_termiox(tty, &tnew); | |
6a1c0680 | 729 | up_write(&tty->termios_rwsem); |
1d65b4a0 AC |
730 | return 0; |
731 | } | |
732 | ||
733 | #endif | |
734 | ||
1da177e4 LT |
735 | |
736 | #ifdef TIOCGETP | |
737 | /* | |
738 | * These are deprecated, but there is limited support.. | |
739 | * | |
740 | * The "sg_flags" translation is a joke.. | |
741 | */ | |
355d95a1 | 742 | static int get_sgflags(struct tty_struct *tty) |
1da177e4 LT |
743 | { |
744 | int flags = 0; | |
745 | ||
adc8d746 AC |
746 | if (!(tty->termios.c_lflag & ICANON)) { |
747 | if (tty->termios.c_lflag & ISIG) | |
1da177e4 LT |
748 | flags |= 0x02; /* cbreak */ |
749 | else | |
750 | flags |= 0x20; /* raw */ | |
751 | } | |
adc8d746 | 752 | if (tty->termios.c_lflag & ECHO) |
1da177e4 | 753 | flags |= 0x08; /* echo */ |
adc8d746 AC |
754 | if (tty->termios.c_oflag & OPOST) |
755 | if (tty->termios.c_oflag & ONLCR) | |
1da177e4 LT |
756 | flags |= 0x10; /* crmod */ |
757 | return flags; | |
758 | } | |
759 | ||
355d95a1 | 760 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
761 | { |
762 | struct sgttyb tmp; | |
763 | ||
6a1c0680 | 764 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
765 | tmp.sg_ispeed = tty->termios.c_ispeed; |
766 | tmp.sg_ospeed = tty->termios.c_ospeed; | |
767 | tmp.sg_erase = tty->termios.c_cc[VERASE]; | |
768 | tmp.sg_kill = tty->termios.c_cc[VKILL]; | |
1da177e4 | 769 | tmp.sg_flags = get_sgflags(tty); |
6a1c0680 | 770 | up_read(&tty->termios_rwsem); |
355d95a1 | 771 | |
1da177e4 LT |
772 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
773 | } | |
774 | ||
355d95a1 | 775 | static void set_sgflags(struct ktermios *termios, int flags) |
1da177e4 | 776 | { |
9833facf AC |
777 | termios->c_iflag = ICRNL | IXON; |
778 | termios->c_oflag = 0; | |
779 | termios->c_lflag = ISIG | ICANON; | |
1da177e4 | 780 | if (flags & 0x02) { /* cbreak */ |
9833facf AC |
781 | termios->c_iflag = 0; |
782 | termios->c_lflag &= ~ICANON; | |
1da177e4 LT |
783 | } |
784 | if (flags & 0x08) { /* echo */ | |
9833facf | 785 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
1da177e4 LT |
786 | ECHOCTL | ECHOKE | IEXTEN; |
787 | } | |
788 | if (flags & 0x10) { /* crmod */ | |
9833facf | 789 | termios->c_oflag |= OPOST | ONLCR; |
1da177e4 LT |
790 | } |
791 | if (flags & 0x20) { /* raw */ | |
9833facf AC |
792 | termios->c_iflag = 0; |
793 | termios->c_lflag &= ~(ISIG | ICANON); | |
1da177e4 | 794 | } |
9833facf AC |
795 | if (!(termios->c_lflag & ICANON)) { |
796 | termios->c_cc[VMIN] = 1; | |
797 | termios->c_cc[VTIME] = 0; | |
1da177e4 LT |
798 | } |
799 | } | |
800 | ||
af9b897e AC |
801 | /** |
802 | * set_sgttyb - set legacy terminal values | |
803 | * @tty: tty structure | |
804 | * @sgttyb: pointer to old style terminal structure | |
805 | * | |
806 | * Updates a terminal from the legacy BSD style terminal information | |
807 | * structure. | |
808 | * | |
6a1c0680 | 809 | * Locking: termios_rwsem |
af9b897e AC |
810 | */ |
811 | ||
355d95a1 | 812 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
813 | { |
814 | int retval; | |
815 | struct sgttyb tmp; | |
edc6afc5 | 816 | struct ktermios termios; |
1da177e4 LT |
817 | |
818 | retval = tty_check_change(tty); | |
819 | if (retval) | |
820 | return retval; | |
355d95a1 | 821 | |
1da177e4 LT |
822 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
823 | return -EFAULT; | |
824 | ||
6a1c0680 | 825 | down_write(&tty->termios_rwsem); |
adc8d746 | 826 | termios = tty->termios; |
1da177e4 LT |
827 | termios.c_cc[VERASE] = tmp.sg_erase; |
828 | termios.c_cc[VKILL] = tmp.sg_kill; | |
829 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 AC |
830 | /* Try and encode into Bfoo format */ |
831 | #ifdef BOTHER | |
355d95a1 AC |
832 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
833 | termios.c_ospeed); | |
edc6afc5 | 834 | #endif |
6a1c0680 | 835 | up_write(&tty->termios_rwsem); |
8d075b19 | 836 | tty_set_termios(tty, &termios); |
1da177e4 LT |
837 | return 0; |
838 | } | |
839 | #endif | |
840 | ||
841 | #ifdef TIOCGETC | |
355d95a1 | 842 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
843 | { |
844 | struct tchars tmp; | |
845 | ||
6a1c0680 | 846 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
847 | tmp.t_intrc = tty->termios.c_cc[VINTR]; |
848 | tmp.t_quitc = tty->termios.c_cc[VQUIT]; | |
849 | tmp.t_startc = tty->termios.c_cc[VSTART]; | |
850 | tmp.t_stopc = tty->termios.c_cc[VSTOP]; | |
851 | tmp.t_eofc = tty->termios.c_cc[VEOF]; | |
852 | tmp.t_brkc = tty->termios.c_cc[VEOL2]; /* what is brkc anyway? */ | |
6a1c0680 | 853 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
854 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
855 | } | |
856 | ||
355d95a1 | 857 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
858 | { |
859 | struct tchars tmp; | |
860 | ||
861 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
862 | return -EFAULT; | |
6a1c0680 | 863 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
864 | tty->termios.c_cc[VINTR] = tmp.t_intrc; |
865 | tty->termios.c_cc[VQUIT] = tmp.t_quitc; | |
866 | tty->termios.c_cc[VSTART] = tmp.t_startc; | |
867 | tty->termios.c_cc[VSTOP] = tmp.t_stopc; | |
868 | tty->termios.c_cc[VEOF] = tmp.t_eofc; | |
869 | tty->termios.c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
6a1c0680 | 870 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
871 | return 0; |
872 | } | |
873 | #endif | |
874 | ||
875 | #ifdef TIOCGLTC | |
355d95a1 | 876 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
877 | { |
878 | struct ltchars tmp; | |
879 | ||
6a1c0680 | 880 | down_read(&tty->termios_rwsem); |
adc8d746 | 881 | tmp.t_suspc = tty->termios.c_cc[VSUSP]; |
355d95a1 | 882 | /* what is dsuspc anyway? */ |
adc8d746 AC |
883 | tmp.t_dsuspc = tty->termios.c_cc[VSUSP]; |
884 | tmp.t_rprntc = tty->termios.c_cc[VREPRINT]; | |
355d95a1 | 885 | /* what is flushc anyway? */ |
adc8d746 AC |
886 | tmp.t_flushc = tty->termios.c_cc[VEOL2]; |
887 | tmp.t_werasc = tty->termios.c_cc[VWERASE]; | |
888 | tmp.t_lnextc = tty->termios.c_cc[VLNEXT]; | |
6a1c0680 | 889 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
890 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
891 | } | |
892 | ||
355d95a1 | 893 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
894 | { |
895 | struct ltchars tmp; | |
896 | ||
897 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
898 | return -EFAULT; | |
899 | ||
6a1c0680 | 900 | down_write(&tty->termios_rwsem); |
adc8d746 | 901 | tty->termios.c_cc[VSUSP] = tmp.t_suspc; |
355d95a1 | 902 | /* what is dsuspc anyway? */ |
adc8d746 AC |
903 | tty->termios.c_cc[VEOL2] = tmp.t_dsuspc; |
904 | tty->termios.c_cc[VREPRINT] = tmp.t_rprntc; | |
355d95a1 | 905 | /* what is flushc anyway? */ |
adc8d746 AC |
906 | tty->termios.c_cc[VEOL2] = tmp.t_flushc; |
907 | tty->termios.c_cc[VWERASE] = tmp.t_werasc; | |
908 | tty->termios.c_cc[VLNEXT] = tmp.t_lnextc; | |
6a1c0680 | 909 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
910 | return 0; |
911 | } | |
912 | #endif | |
913 | ||
af9b897e AC |
914 | /** |
915 | * send_prio_char - send priority character | |
916 | * | |
917 | * Send a high priority character to the tty even if stopped | |
918 | * | |
5f412b24 | 919 | * Locking: none for xchar method, write ordering for write method. |
1da177e4 | 920 | */ |
af9b897e | 921 | |
5f412b24 | 922 | static int send_prio_char(struct tty_struct *tty, char ch) |
1da177e4 LT |
923 | { |
924 | int was_stopped = tty->stopped; | |
925 | ||
f34d7a5b AC |
926 | if (tty->ops->send_xchar) { |
927 | tty->ops->send_xchar(tty, ch); | |
5f412b24 | 928 | return 0; |
1da177e4 | 929 | } |
5f412b24 | 930 | |
9c1729db | 931 | if (tty_write_lock(tty, 0) < 0) |
5f412b24 AC |
932 | return -ERESTARTSYS; |
933 | ||
1da177e4 LT |
934 | if (was_stopped) |
935 | start_tty(tty); | |
f34d7a5b | 936 | tty->ops->write(tty, &ch, 1); |
1da177e4 LT |
937 | if (was_stopped) |
938 | stop_tty(tty); | |
9c1729db | 939 | tty_write_unlock(tty); |
5f412b24 | 940 | return 0; |
1da177e4 LT |
941 | } |
942 | ||
1c2630cc AC |
943 | /** |
944 | * tty_change_softcar - carrier change ioctl helper | |
945 | * @tty: tty to update | |
946 | * @arg: enable/disable CLOCAL | |
947 | * | |
948 | * Perform a change to the CLOCAL state and call into the driver | |
6a1c0680 | 949 | * layer to make it visible. All done with the termios rwsem |
1c2630cc AC |
950 | */ |
951 | ||
952 | static int tty_change_softcar(struct tty_struct *tty, int arg) | |
953 | { | |
954 | int ret = 0; | |
955 | int bit = arg ? CLOCAL : 0; | |
f34d7a5b | 956 | struct ktermios old; |
1c2630cc | 957 | |
6a1c0680 | 958 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
959 | old = tty->termios; |
960 | tty->termios.c_cflag &= ~CLOCAL; | |
961 | tty->termios.c_cflag |= bit; | |
f34d7a5b AC |
962 | if (tty->ops->set_termios) |
963 | tty->ops->set_termios(tty, &old); | |
adc8d746 | 964 | if ((tty->termios.c_cflag & CLOCAL) != bit) |
1c2630cc | 965 | ret = -EINVAL; |
6a1c0680 | 966 | up_write(&tty->termios_rwsem); |
1c2630cc AC |
967 | return ret; |
968 | } | |
969 | ||
0fc00e24 AC |
970 | /** |
971 | * tty_mode_ioctl - mode related ioctls | |
972 | * @tty: tty for the ioctl | |
973 | * @file: file pointer for the tty | |
974 | * @cmd: command | |
975 | * @arg: ioctl argument | |
976 | * | |
977 | * Perform non line discipline specific mode control ioctls. This | |
978 | * is designed to be called by line disciplines to ensure they provide | |
979 | * consistent mode setting. | |
980 | */ | |
981 | ||
355d95a1 | 982 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
0fc00e24 | 983 | unsigned int cmd, unsigned long arg) |
1da177e4 | 984 | { |
355d95a1 | 985 | struct tty_struct *real_tty; |
1da177e4 | 986 | void __user *p = (void __user *)arg; |
8f520021 | 987 | int ret = 0; |
26a2e20f | 988 | struct ktermios kterm; |
1da177e4 | 989 | |
8d075b19 AC |
990 | BUG_ON(file == NULL); |
991 | ||
1da177e4 LT |
992 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
993 | tty->driver->subtype == PTY_TYPE_MASTER) | |
994 | real_tty = tty->link; | |
995 | else | |
996 | real_tty = tty; | |
997 | ||
998 | switch (cmd) { | |
999 | #ifdef TIOCGETP | |
355d95a1 AC |
1000 | case TIOCGETP: |
1001 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1002 | case TIOCSETP: | |
1003 | case TIOCSETN: | |
1004 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1da177e4 LT |
1005 | #endif |
1006 | #ifdef TIOCGETC | |
355d95a1 AC |
1007 | case TIOCGETC: |
1008 | return get_tchars(real_tty, p); | |
1009 | case TIOCSETC: | |
1010 | return set_tchars(real_tty, p); | |
1da177e4 LT |
1011 | #endif |
1012 | #ifdef TIOCGLTC | |
355d95a1 AC |
1013 | case TIOCGLTC: |
1014 | return get_ltchars(real_tty, p); | |
1015 | case TIOCSLTC: | |
1016 | return set_ltchars(real_tty, p); | |
1da177e4 | 1017 | #endif |
355d95a1 AC |
1018 | case TCSETSF: |
1019 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
1020 | case TCSETSW: | |
1021 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
1022 | case TCSETS: | |
1023 | return set_termios(real_tty, p, TERMIOS_OLD); | |
edc6afc5 | 1024 | #ifndef TCGETS2 |
355d95a1 | 1025 | case TCGETS: |
26a2e20f AC |
1026 | copy_termios(real_tty, &kterm); |
1027 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 1028 | ret = -EFAULT; |
8f520021 | 1029 | return ret; |
edc6afc5 | 1030 | #else |
355d95a1 | 1031 | case TCGETS: |
26a2e20f AC |
1032 | copy_termios(real_tty, &kterm); |
1033 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 1034 | ret = -EFAULT; |
8f520021 | 1035 | return ret; |
355d95a1 | 1036 | case TCGETS2: |
26a2e20f AC |
1037 | copy_termios(real_tty, &kterm); |
1038 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) | |
8f520021 | 1039 | ret = -EFAULT; |
8f520021 | 1040 | return ret; |
355d95a1 AC |
1041 | case TCSETSF2: |
1042 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
1043 | case TCSETSW2: | |
1044 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
1045 | case TCSETS2: | |
1046 | return set_termios(real_tty, p, 0); | |
edc6afc5 | 1047 | #endif |
355d95a1 AC |
1048 | case TCGETA: |
1049 | return get_termio(real_tty, p); | |
1050 | case TCSETAF: | |
1051 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
1052 | case TCSETAW: | |
1053 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
1054 | case TCSETA: | |
1055 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
0fc00e24 | 1056 | #ifndef TCGETS2 |
355d95a1 | 1057 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1058 | copy_termios_locked(real_tty, &kterm); |
1059 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 1060 | ret = -EFAULT; |
8f520021 | 1061 | return ret; |
355d95a1 AC |
1062 | case TIOCSLCKTRMIOS: |
1063 | if (!capable(CAP_SYS_ADMIN)) | |
1064 | return -EPERM; | |
26a2e20f AC |
1065 | copy_termios_locked(real_tty, &kterm); |
1066 | if (user_termios_to_kernel_termios(&kterm, | |
355d95a1 | 1067 | (struct termios __user *) arg)) |
26a2e20f | 1068 | return -EFAULT; |
6a1c0680 | 1069 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 1070 | real_tty->termios_locked = kterm; |
6a1c0680 | 1071 | up_write(&real_tty->termios_rwsem); |
26a2e20f | 1072 | return 0; |
0fc00e24 | 1073 | #else |
355d95a1 | 1074 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1075 | copy_termios_locked(real_tty, &kterm); |
1076 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 1077 | ret = -EFAULT; |
8f520021 | 1078 | return ret; |
355d95a1 AC |
1079 | case TIOCSLCKTRMIOS: |
1080 | if (!capable(CAP_SYS_ADMIN)) | |
26a2e20f AC |
1081 | return -EPERM; |
1082 | copy_termios_locked(real_tty, &kterm); | |
1083 | if (user_termios_to_kernel_termios_1(&kterm, | |
355d95a1 | 1084 | (struct termios __user *) arg)) |
26a2e20f | 1085 | return -EFAULT; |
6a1c0680 | 1086 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 1087 | real_tty->termios_locked = kterm; |
6a1c0680 | 1088 | up_write(&real_tty->termios_rwsem); |
8f520021 | 1089 | return ret; |
0fc00e24 | 1090 | #endif |
1d65b4a0 | 1091 | #ifdef TCGETX |
5dca607b MF |
1092 | case TCGETX: { |
1093 | struct termiox ktermx; | |
1d65b4a0 AC |
1094 | if (real_tty->termiox == NULL) |
1095 | return -EINVAL; | |
6a1c0680 | 1096 | down_read(&real_tty->termios_rwsem); |
26a2e20f | 1097 | memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); |
6a1c0680 | 1098 | up_read(&real_tty->termios_rwsem); |
26a2e20f AC |
1099 | if (copy_to_user(p, &ktermx, sizeof(struct termiox))) |
1100 | ret = -EFAULT; | |
8f520021 | 1101 | return ret; |
5dca607b | 1102 | } |
1d65b4a0 AC |
1103 | case TCSETX: |
1104 | return set_termiox(real_tty, p, 0); | |
1105 | case TCSETXW: | |
1106 | return set_termiox(real_tty, p, TERMIOS_WAIT); | |
1107 | case TCSETXF: | |
1108 | return set_termiox(real_tty, p, TERMIOS_FLUSH); | |
1109 | #endif | |
355d95a1 | 1110 | case TIOCGSOFTCAR: |
26a2e20f AC |
1111 | copy_termios(real_tty, &kterm); |
1112 | ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, | |
355d95a1 | 1113 | (int __user *)arg); |
8f520021 | 1114 | return ret; |
355d95a1 AC |
1115 | case TIOCSSOFTCAR: |
1116 | if (get_user(arg, (unsigned int __user *) arg)) | |
1117 | return -EFAULT; | |
f753f327 | 1118 | return tty_change_softcar(real_tty, arg); |
355d95a1 AC |
1119 | default: |
1120 | return -ENOIOCTLCMD; | |
0fc00e24 AC |
1121 | } |
1122 | } | |
0fc00e24 AC |
1123 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
1124 | ||
e7f3880c PH |
1125 | |
1126 | /* Caller guarantees ldisc reference is held */ | |
1127 | static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
0fc00e24 | 1128 | { |
e7f3880c | 1129 | struct tty_ldisc *ld = tty->ldisc; |
0fc00e24 | 1130 | |
0fc00e24 AC |
1131 | switch (arg) { |
1132 | case TCIFLUSH: | |
a1bf9584 | 1133 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 1134 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
1135 | tty_unthrottle(tty); |
1136 | } | |
0fc00e24 AC |
1137 | break; |
1138 | case TCIOFLUSH: | |
a1bf9584 | 1139 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 1140 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
1141 | tty_unthrottle(tty); |
1142 | } | |
0fc00e24 AC |
1143 | /* fall through */ |
1144 | case TCOFLUSH: | |
f34d7a5b | 1145 | tty_driver_flush_buffer(tty); |
0fc00e24 AC |
1146 | break; |
1147 | default: | |
0fc00e24 AC |
1148 | return -EINVAL; |
1149 | } | |
0fc00e24 AC |
1150 | return 0; |
1151 | } | |
e7f3880c PH |
1152 | |
1153 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
1154 | { | |
1155 | struct tty_ldisc *ld; | |
1156 | int retval = tty_check_change(tty); | |
1157 | if (retval) | |
1158 | return retval; | |
1159 | ||
1160 | ld = tty_ldisc_ref_wait(tty); | |
1161 | retval = __tty_perform_flush(tty, arg); | |
1162 | if (ld) | |
1163 | tty_ldisc_deref(ld); | |
1164 | return retval; | |
1165 | } | |
0fc00e24 AC |
1166 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
1167 | ||
47afa7a5 | 1168 | int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
0fc00e24 AC |
1169 | unsigned int cmd, unsigned long arg) |
1170 | { | |
0fc00e24 AC |
1171 | int retval; |
1172 | ||
0fc00e24 | 1173 | switch (cmd) { |
355d95a1 AC |
1174 | case TCXONC: |
1175 | retval = tty_check_change(tty); | |
1176 | if (retval) | |
1177 | return retval; | |
1178 | switch (arg) { | |
1179 | case TCOOFF: | |
1180 | if (!tty->flow_stopped) { | |
1181 | tty->flow_stopped = 1; | |
1182 | stop_tty(tty); | |
1da177e4 | 1183 | } |
355d95a1 AC |
1184 | break; |
1185 | case TCOON: | |
1186 | if (tty->flow_stopped) { | |
1187 | tty->flow_stopped = 0; | |
1188 | start_tty(tty); | |
1189 | } | |
1190 | break; | |
1191 | case TCIOFF: | |
1192 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
1193 | return send_prio_char(tty, STOP_CHAR(tty)); | |
1194 | break; | |
1195 | case TCION: | |
1196 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
1197 | return send_prio_char(tty, START_CHAR(tty)); | |
1198 | break; | |
1da177e4 | 1199 | default: |
355d95a1 | 1200 | return -EINVAL; |
1da177e4 | 1201 | } |
355d95a1 AC |
1202 | return 0; |
1203 | case TCFLSH: | |
5cec7bf6 PH |
1204 | retval = tty_check_change(tty); |
1205 | if (retval) | |
1206 | return retval; | |
e7f3880c | 1207 | return __tty_perform_flush(tty, arg); |
355d95a1 AC |
1208 | default: |
1209 | /* Try the mode commands */ | |
1210 | return tty_mode_ioctl(tty, file, cmd, arg); | |
1211 | } | |
1da177e4 | 1212 | } |
47afa7a5 | 1213 | EXPORT_SYMBOL(n_tty_ioctl_helper); |
8193c429 TM |
1214 | |
1215 | #ifdef CONFIG_COMPAT | |
1216 | long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, | |
1217 | unsigned int cmd, unsigned long arg) | |
1218 | { | |
1219 | switch (cmd) { | |
1220 | case TIOCGLCKTRMIOS: | |
1221 | case TIOCSLCKTRMIOS: | |
1222 | return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg)); | |
1223 | default: | |
1224 | return -ENOIOCTLCMD; | |
1225 | } | |
1226 | } | |
1227 | EXPORT_SYMBOL(n_tty_compat_ioctl_helper); | |
1228 | #endif | |
1229 |