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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 | ||
ff8339dc PH |
29 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
30 | # define tty_debug_wait_until_sent(tty, f, args...) tty_debug(tty, f, ##args) | |
31 | #else | |
32 | # define tty_debug_wait_until_sent(tty, f, args...) do {} while (0) | |
33 | #endif | |
34 | ||
1da177e4 LT |
35 | #undef DEBUG |
36 | ||
37 | /* | |
38 | * Internal flag options for termios setting behavior | |
39 | */ | |
40 | #define TERMIOS_FLUSH 1 | |
41 | #define TERMIOS_WAIT 2 | |
42 | #define TERMIOS_TERMIO 4 | |
edc6afc5 | 43 | #define TERMIOS_OLD 8 |
1da177e4 | 44 | |
af9b897e | 45 | |
d81ed103 AC |
46 | /** |
47 | * tty_chars_in_buffer - characters pending | |
48 | * @tty: terminal | |
49 | * | |
50 | * Return the number of bytes of data in the device private | |
51 | * output queue. If no private method is supplied there is assumed | |
52 | * to be no queue on the device. | |
53 | */ | |
54 | ||
f34d7a5b AC |
55 | int tty_chars_in_buffer(struct tty_struct *tty) |
56 | { | |
57 | if (tty->ops->chars_in_buffer) | |
58 | return tty->ops->chars_in_buffer(tty); | |
59 | else | |
60 | return 0; | |
61 | } | |
f34d7a5b AC |
62 | EXPORT_SYMBOL(tty_chars_in_buffer); |
63 | ||
d81ed103 AC |
64 | /** |
65 | * tty_write_room - write queue space | |
66 | * @tty: terminal | |
67 | * | |
68 | * Return the number of bytes that can be queued to this device | |
69 | * at the present time. The result should be treated as a guarantee | |
70 | * and the driver cannot offer a value it later shrinks by more than | |
71 | * the number of bytes written. If no method is provided 2K is always | |
72 | * returned and data may be lost as there will be no flow control. | |
73 | */ | |
74 | ||
f34d7a5b AC |
75 | int tty_write_room(struct tty_struct *tty) |
76 | { | |
77 | if (tty->ops->write_room) | |
78 | return tty->ops->write_room(tty); | |
79 | return 2048; | |
80 | } | |
f34d7a5b AC |
81 | EXPORT_SYMBOL(tty_write_room); |
82 | ||
d81ed103 AC |
83 | /** |
84 | * tty_driver_flush_buffer - discard internal buffer | |
85 | * @tty: terminal | |
86 | * | |
87 | * Discard the internal output buffer for this device. If no method | |
88 | * is provided then either the buffer cannot be hardware flushed or | |
89 | * there is no buffer driver side. | |
90 | */ | |
f34d7a5b AC |
91 | void tty_driver_flush_buffer(struct tty_struct *tty) |
92 | { | |
93 | if (tty->ops->flush_buffer) | |
94 | tty->ops->flush_buffer(tty); | |
95 | } | |
f34d7a5b AC |
96 | EXPORT_SYMBOL(tty_driver_flush_buffer); |
97 | ||
d81ed103 AC |
98 | /** |
99 | * tty_throttle - flow control | |
100 | * @tty: terminal | |
101 | * | |
102 | * Indicate that a tty should stop transmitting data down the stack. | |
6a1c0680 | 103 | * Takes the termios rwsem to protect against parallel throttle/unthrottle |
38db8979 AC |
104 | * and also to ensure the driver can consistently reference its own |
105 | * termios data at this point when implementing software flow control. | |
d81ed103 AC |
106 | */ |
107 | ||
39c2e60f AC |
108 | void tty_throttle(struct tty_struct *tty) |
109 | { | |
6a1c0680 | 110 | down_write(&tty->termios_rwsem); |
39c2e60f AC |
111 | /* check TTY_THROTTLED first so it indicates our state */ |
112 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && | |
113 | tty->ops->throttle) | |
114 | tty->ops->throttle(tty); | |
70bc1264 | 115 | tty->flow_change = 0; |
6a1c0680 | 116 | up_write(&tty->termios_rwsem); |
39c2e60f AC |
117 | } |
118 | EXPORT_SYMBOL(tty_throttle); | |
119 | ||
d81ed103 AC |
120 | /** |
121 | * tty_unthrottle - flow control | |
122 | * @tty: terminal | |
123 | * | |
124 | * Indicate that a tty may continue transmitting data down the stack. | |
6a1c0680 | 125 | * Takes the termios rwsem to protect against parallel throttle/unthrottle |
38db8979 AC |
126 | * and also to ensure the driver can consistently reference its own |
127 | * termios data at this point when implementing software flow control. | |
128 | * | |
129 | * Drivers should however remember that the stack can issue a throttle, | |
130 | * then change flow control method, then unthrottle. | |
d81ed103 AC |
131 | */ |
132 | ||
39c2e60f AC |
133 | void tty_unthrottle(struct tty_struct *tty) |
134 | { | |
6a1c0680 | 135 | down_write(&tty->termios_rwsem); |
39c2e60f AC |
136 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
137 | tty->ops->unthrottle) | |
138 | tty->ops->unthrottle(tty); | |
70bc1264 | 139 | tty->flow_change = 0; |
6a1c0680 | 140 | up_write(&tty->termios_rwsem); |
39c2e60f AC |
141 | } |
142 | EXPORT_SYMBOL(tty_unthrottle); | |
f34d7a5b | 143 | |
70bc1264 PH |
144 | /** |
145 | * tty_throttle_safe - flow control | |
146 | * @tty: terminal | |
147 | * | |
148 | * Similar to tty_throttle() but will only attempt throttle | |
149 | * if tty->flow_change is TTY_THROTTLE_SAFE. Prevents an accidental | |
150 | * throttle due to race conditions when throttling is conditional | |
151 | * on factors evaluated prior to throttling. | |
152 | * | |
153 | * Returns 0 if tty is throttled (or was already throttled) | |
154 | */ | |
155 | ||
156 | int tty_throttle_safe(struct tty_struct *tty) | |
157 | { | |
158 | int ret = 0; | |
159 | ||
d8c1f929 | 160 | mutex_lock(&tty->throttle_mutex); |
70bc1264 PH |
161 | if (!test_bit(TTY_THROTTLED, &tty->flags)) { |
162 | if (tty->flow_change != TTY_THROTTLE_SAFE) | |
163 | ret = 1; | |
164 | else { | |
579a00a5 | 165 | set_bit(TTY_THROTTLED, &tty->flags); |
70bc1264 PH |
166 | if (tty->ops->throttle) |
167 | tty->ops->throttle(tty); | |
168 | } | |
169 | } | |
d8c1f929 | 170 | mutex_unlock(&tty->throttle_mutex); |
70bc1264 PH |
171 | |
172 | return ret; | |
173 | } | |
174 | ||
175 | /** | |
176 | * tty_unthrottle_safe - flow control | |
177 | * @tty: terminal | |
178 | * | |
179 | * Similar to tty_unthrottle() but will only attempt unthrottle | |
180 | * if tty->flow_change is TTY_UNTHROTTLE_SAFE. Prevents an accidental | |
181 | * unthrottle due to race conditions when unthrottling is conditional | |
182 | * on factors evaluated prior to unthrottling. | |
183 | * | |
184 | * Returns 0 if tty is unthrottled (or was already unthrottled) | |
185 | */ | |
186 | ||
187 | int tty_unthrottle_safe(struct tty_struct *tty) | |
188 | { | |
189 | int ret = 0; | |
190 | ||
d8c1f929 | 191 | mutex_lock(&tty->throttle_mutex); |
70bc1264 PH |
192 | if (test_bit(TTY_THROTTLED, &tty->flags)) { |
193 | if (tty->flow_change != TTY_UNTHROTTLE_SAFE) | |
194 | ret = 1; | |
195 | else { | |
579a00a5 | 196 | clear_bit(TTY_THROTTLED, &tty->flags); |
70bc1264 PH |
197 | if (tty->ops->unthrottle) |
198 | tty->ops->unthrottle(tty); | |
199 | } | |
200 | } | |
d8c1f929 | 201 | mutex_unlock(&tty->throttle_mutex); |
70bc1264 PH |
202 | |
203 | return ret; | |
204 | } | |
205 | ||
af9b897e AC |
206 | /** |
207 | * tty_wait_until_sent - wait for I/O to finish | |
208 | * @tty: tty we are waiting for | |
209 | * @timeout: how long we will wait | |
210 | * | |
211 | * Wait for characters pending in a tty driver to hit the wire, or | |
212 | * for a timeout to occur (eg due to flow control) | |
213 | * | |
214 | * Locking: none | |
215 | */ | |
216 | ||
355d95a1 | 217 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
1da177e4 | 218 | { |
ff8339dc PH |
219 | tty_debug_wait_until_sent(tty, "\n"); |
220 | ||
1da177e4 LT |
221 | if (!timeout) |
222 | timeout = MAX_SCHEDULE_TIMEOUT; | |
79fbf4a5 | 223 | |
c37bc682 JH |
224 | timeout = wait_event_interruptible_timeout(tty->write_wait, |
225 | !tty_chars_in_buffer(tty), timeout); | |
226 | if (timeout <= 0) | |
79fbf4a5 | 227 | return; |
79fbf4a5 JH |
228 | |
229 | if (timeout == MAX_SCHEDULE_TIMEOUT) | |
230 | timeout = 0; | |
231 | ||
232 | if (tty->ops->wait_until_sent) | |
233 | tty->ops->wait_until_sent(tty, timeout); | |
1da177e4 | 234 | } |
1da177e4 LT |
235 | EXPORT_SYMBOL(tty_wait_until_sent); |
236 | ||
d81ed103 AC |
237 | |
238 | /* | |
239 | * Termios Helper Methods | |
240 | */ | |
241 | ||
edc6afc5 AC |
242 | static void unset_locked_termios(struct ktermios *termios, |
243 | struct ktermios *old, | |
244 | struct ktermios *locked) | |
1da177e4 LT |
245 | { |
246 | int i; | |
355d95a1 AC |
247 | |
248 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) | |
1da177e4 LT |
249 | |
250 | if (!locked) { | |
251 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); | |
252 | return; | |
253 | } | |
254 | ||
255 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); | |
256 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); | |
257 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); | |
258 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); | |
259 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; | |
355d95a1 | 260 | for (i = 0; i < NCCS; i++) |
1da177e4 LT |
261 | termios->c_cc[i] = locked->c_cc[i] ? |
262 | old->c_cc[i] : termios->c_cc[i]; | |
edc6afc5 | 263 | /* FIXME: What should we do for i/ospeed */ |
1da177e4 LT |
264 | } |
265 | ||
edc6afc5 AC |
266 | /* |
267 | * Routine which returns the baud rate of the tty | |
268 | * | |
269 | * Note that the baud_table needs to be kept in sync with the | |
270 | * include/asm/termbits.h file. | |
271 | */ | |
272 | static const speed_t baud_table[] = { | |
273 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, | |
274 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, | |
275 | #ifdef __sparc__ | |
276 | 76800, 153600, 307200, 614400, 921600 | |
277 | #else | |
278 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, | |
279 | 2500000, 3000000, 3500000, 4000000 | |
280 | #endif | |
281 | }; | |
282 | ||
283 | #ifndef __sparc__ | |
284 | static const tcflag_t baud_bits[] = { | |
285 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
286 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
287 | B57600, B115200, B230400, B460800, B500000, B576000, | |
288 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, | |
289 | B3000000, B3500000, B4000000 | |
290 | }; | |
291 | #else | |
292 | static const tcflag_t baud_bits[] = { | |
293 | B0, B50, B75, B110, B134, B150, B200, B300, B600, | |
294 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, | |
295 | B57600, B115200, B230400, B460800, B76800, B153600, | |
296 | B307200, B614400, B921600 | |
297 | }; | |
298 | #endif | |
299 | ||
300 | static int n_baud_table = ARRAY_SIZE(baud_table); | |
301 | ||
302 | /** | |
303 | * tty_termios_baud_rate | |
304 | * @termios: termios structure | |
305 | * | |
306 | * Convert termios baud rate data into a speed. This should be called | |
307 | * with the termios lock held if this termios is a terminal termios | |
308 | * structure. May change the termios data. Device drivers can call this | |
309 | * function but should use ->c_[io]speed directly as they are updated. | |
310 | * | |
311 | * Locking: none | |
312 | */ | |
313 | ||
314 | speed_t tty_termios_baud_rate(struct ktermios *termios) | |
315 | { | |
316 | unsigned int cbaud; | |
317 | ||
318 | cbaud = termios->c_cflag & CBAUD; | |
319 | ||
320 | #ifdef BOTHER | |
25985edc | 321 | /* Magic token for arbitrary speed via c_ispeed/c_ospeed */ |
edc6afc5 AC |
322 | if (cbaud == BOTHER) |
323 | return termios->c_ospeed; | |
324 | #endif | |
325 | if (cbaud & CBAUDEX) { | |
326 | cbaud &= ~CBAUDEX; | |
327 | ||
328 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
329 | termios->c_cflag &= ~CBAUDEX; | |
330 | else | |
331 | cbaud += 15; | |
332 | } | |
333 | return baud_table[cbaud]; | |
334 | } | |
edc6afc5 AC |
335 | EXPORT_SYMBOL(tty_termios_baud_rate); |
336 | ||
337 | /** | |
338 | * tty_termios_input_baud_rate | |
339 | * @termios: termios structure | |
340 | * | |
341 | * Convert termios baud rate data into a speed. This should be called | |
342 | * with the termios lock held if this termios is a terminal termios | |
343 | * structure. May change the termios data. Device drivers can call this | |
344 | * function but should use ->c_[io]speed directly as they are updated. | |
345 | * | |
346 | * Locking: none | |
347 | */ | |
348 | ||
349 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) | |
350 | { | |
351 | #ifdef IBSHIFT | |
352 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; | |
353 | ||
354 | if (cbaud == B0) | |
355 | return tty_termios_baud_rate(termios); | |
356 | ||
25985edc | 357 | /* Magic token for arbitrary speed via c_ispeed*/ |
edc6afc5 AC |
358 | if (cbaud == BOTHER) |
359 | return termios->c_ispeed; | |
360 | ||
361 | if (cbaud & CBAUDEX) { | |
362 | cbaud &= ~CBAUDEX; | |
363 | ||
364 | if (cbaud < 1 || cbaud + 15 > n_baud_table) | |
365 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); | |
366 | else | |
367 | cbaud += 15; | |
368 | } | |
369 | return baud_table[cbaud]; | |
370 | #else | |
371 | return tty_termios_baud_rate(termios); | |
372 | #endif | |
373 | } | |
edc6afc5 AC |
374 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
375 | ||
edc6afc5 AC |
376 | /** |
377 | * tty_termios_encode_baud_rate | |
78137e3b | 378 | * @termios: ktermios structure holding user requested state |
edc6afc5 AC |
379 | * @ispeed: input speed |
380 | * @ospeed: output speed | |
381 | * | |
382 | * Encode the speeds set into the passed termios structure. This is | |
f98e5b80 | 383 | * used as a library helper for drivers so that they can report back |
edc6afc5 AC |
384 | * the actual speed selected when it differs from the speed requested |
385 | * | |
78137e3b AC |
386 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
387 | * we need to carefully set the bits when the user does not get the | |
388 | * desired speed. We allow small margins and preserve as much of possible | |
06fe9fb4 | 389 | * of the input intent to keep compatibility. |
edc6afc5 AC |
390 | * |
391 | * Locking: Caller should hold termios lock. This is already held | |
392 | * when calling this function from the driver termios handler. | |
5f519d72 AC |
393 | * |
394 | * The ifdefs deal with platforms whose owners have yet to update them | |
395 | * and will all go away once this is done. | |
edc6afc5 AC |
396 | */ |
397 | ||
75e8b71d MR |
398 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
399 | speed_t ibaud, speed_t obaud) | |
edc6afc5 AC |
400 | { |
401 | int i = 0; | |
78137e3b AC |
402 | int ifound = -1, ofound = -1; |
403 | int iclose = ibaud/50, oclose = obaud/50; | |
404 | int ibinput = 0; | |
edc6afc5 | 405 | |
5f519d72 AC |
406 | if (obaud == 0) /* CD dropped */ |
407 | ibaud = 0; /* Clear ibaud to be sure */ | |
408 | ||
edc6afc5 AC |
409 | termios->c_ispeed = ibaud; |
410 | termios->c_ospeed = obaud; | |
411 | ||
5f519d72 | 412 | #ifdef BOTHER |
78137e3b | 413 | /* If the user asked for a precise weird speed give a precise weird |
a1d51aa2 | 414 | answer. If they asked for a Bfoo speed they may have problems |
78137e3b AC |
415 | digesting non-exact replies so fuzz a bit */ |
416 | ||
417 | if ((termios->c_cflag & CBAUD) == BOTHER) | |
418 | oclose = 0; | |
419 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) | |
420 | iclose = 0; | |
421 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) | |
422 | ibinput = 1; /* An input speed was specified */ | |
5f519d72 | 423 | #endif |
edc6afc5 | 424 | termios->c_cflag &= ~CBAUD; |
edc6afc5 | 425 | |
5f519d72 AC |
426 | /* |
427 | * Our goal is to find a close match to the standard baud rate | |
428 | * returned. Walk the baud rate table and if we get a very close | |
429 | * match then report back the speed as a POSIX Bxxxx value by | |
430 | * preference | |
431 | */ | |
432 | ||
edc6afc5 | 433 | do { |
75e8b71d MR |
434 | if (obaud - oclose <= baud_table[i] && |
435 | obaud + oclose >= baud_table[i]) { | |
edc6afc5 | 436 | termios->c_cflag |= baud_bits[i]; |
78137e3b | 437 | ofound = i; |
edc6afc5 | 438 | } |
75e8b71d MR |
439 | if (ibaud - iclose <= baud_table[i] && |
440 | ibaud + iclose >= baud_table[i]) { | |
441 | /* For the case input == output don't set IBAUD bits | |
442 | if the user didn't do so */ | |
5f519d72 AC |
443 | if (ofound == i && !ibinput) |
444 | ifound = i; | |
445 | #ifdef IBSHIFT | |
446 | else { | |
447 | ifound = i; | |
78137e3b | 448 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
5f519d72 AC |
449 | } |
450 | #endif | |
edc6afc5 | 451 | } |
6804396f | 452 | } while (++i < n_baud_table); |
5f519d72 AC |
453 | |
454 | /* | |
455 | * If we found no match then use BOTHER if provided or warn | |
456 | * the user their platform maintainer needs to wake up if not. | |
457 | */ | |
458 | #ifdef BOTHER | |
78137e3b | 459 | if (ofound == -1) |
edc6afc5 | 460 | termios->c_cflag |= BOTHER; |
78137e3b AC |
461 | /* Set exact input bits only if the input and output differ or the |
462 | user already did */ | |
6804396f | 463 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
edc6afc5 | 464 | termios->c_cflag |= (BOTHER << IBSHIFT); |
5f519d72 AC |
465 | #else |
466 | if (ifound == -1 || ofound == -1) { | |
9074d963 | 467 | printk_once(KERN_WARNING "tty: Unable to return correct " |
5f519d72 AC |
468 | "speed data as your architecture needs updating.\n"); |
469 | } | |
470 | #endif | |
edc6afc5 | 471 | } |
edc6afc5 AC |
472 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
473 | ||
d81ed103 AC |
474 | /** |
475 | * tty_encode_baud_rate - set baud rate of the tty | |
476 | * @ibaud: input baud rate | |
477 | * @obad: output baud rate | |
478 | * | |
479 | * Update the current termios data for the tty with the new speed | |
6a1c0680 | 480 | * settings. The caller must hold the termios_rwsem for the tty in |
d81ed103 AC |
481 | * question. |
482 | */ | |
483 | ||
5f519d72 AC |
484 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
485 | { | |
adc8d746 | 486 | tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud); |
5f519d72 AC |
487 | } |
488 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); | |
edc6afc5 | 489 | |
5f519d72 AC |
490 | /** |
491 | * tty_termios_copy_hw - copy hardware settings | |
492 | * @new: New termios | |
493 | * @old: Old termios | |
494 | * | |
25985edc | 495 | * Propagate the hardware specific terminal setting bits from |
5f519d72 AC |
496 | * the old termios structure to the new one. This is used in cases |
497 | * where the hardware does not support reconfiguration or as a helper | |
498 | * in some cases where only minimal reconfiguration is supported | |
499 | */ | |
500 | ||
501 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) | |
502 | { | |
503 | /* The bits a dumb device handles in software. Smart devices need | |
504 | to always provide a set_termios method */ | |
505 | new->c_cflag &= HUPCL | CREAD | CLOCAL; | |
506 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); | |
507 | new->c_ispeed = old->c_ispeed; | |
508 | new->c_ospeed = old->c_ospeed; | |
509 | } | |
5f519d72 AC |
510 | EXPORT_SYMBOL(tty_termios_copy_hw); |
511 | ||
bf5e5834 AC |
512 | /** |
513 | * tty_termios_hw_change - check for setting change | |
514 | * @a: termios | |
515 | * @b: termios to compare | |
516 | * | |
517 | * Check if any of the bits that affect a dumb device have changed | |
518 | * between the two termios structures, or a speed change is needed. | |
519 | */ | |
520 | ||
521 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) | |
522 | { | |
523 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) | |
524 | return 1; | |
525 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) | |
526 | return 1; | |
527 | return 0; | |
528 | } | |
529 | EXPORT_SYMBOL(tty_termios_hw_change); | |
530 | ||
af9b897e | 531 | /** |
8d075b19 | 532 | * tty_set_termios - update termios values |
af9b897e AC |
533 | * @tty: tty to update |
534 | * @new_termios: desired new value | |
535 | * | |
dbfcd851 | 536 | * Perform updates to the termios values set on this terminal. |
6460fbbf PH |
537 | * A master pty's termios should never be set. |
538 | * | |
6a1c0680 | 539 | * Locking: termios_rwsem |
af9b897e AC |
540 | */ |
541 | ||
b00f5c2d | 542 | int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) |
1da177e4 | 543 | { |
978e595f | 544 | struct ktermios old_termios; |
1da177e4 | 545 | struct tty_ldisc *ld; |
355d95a1 | 546 | |
6460fbbf PH |
547 | WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY && |
548 | tty->driver->subtype == PTY_TYPE_MASTER); | |
1da177e4 LT |
549 | /* |
550 | * Perform the actual termios internal changes under lock. | |
551 | */ | |
355d95a1 | 552 | |
1da177e4 LT |
553 | |
554 | /* FIXME: we need to decide on some locking/ordering semantics | |
555 | for the set_termios notification eventually */ | |
6a1c0680 | 556 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
557 | old_termios = tty->termios; |
558 | tty->termios = *new_termios; | |
559 | unset_locked_termios(&tty->termios, &old_termios, &tty->termios_locked); | |
1da177e4 | 560 | |
f34d7a5b | 561 | if (tty->ops->set_termios) |
c961bfb1 | 562 | tty->ops->set_termios(tty, &old_termios); |
5f519d72 | 563 | else |
adc8d746 | 564 | tty_termios_copy_hw(&tty->termios, &old_termios); |
1da177e4 LT |
565 | |
566 | ld = tty_ldisc_ref(tty); | |
567 | if (ld != NULL) { | |
a352def2 | 568 | if (ld->ops->set_termios) |
c961bfb1 | 569 | ld->ops->set_termios(tty, &old_termios); |
1da177e4 LT |
570 | tty_ldisc_deref(ld); |
571 | } | |
6a1c0680 | 572 | up_write(&tty->termios_rwsem); |
8d075b19 | 573 | return 0; |
1da177e4 | 574 | } |
b00f5c2d | 575 | EXPORT_SYMBOL_GPL(tty_set_termios); |
1da177e4 | 576 | |
af9b897e AC |
577 | /** |
578 | * set_termios - set termios values for a tty | |
579 | * @tty: terminal device | |
580 | * @arg: user data | |
581 | * @opt: option information | |
582 | * | |
3a4fa0a2 | 583 | * Helper function to prepare termios data and run necessary other |
8d075b19 | 584 | * functions before using tty_set_termios to do the actual changes. |
af9b897e AC |
585 | * |
586 | * Locking: | |
6a1c0680 | 587 | * Called functions take ldisc and termios_rwsem locks |
af9b897e AC |
588 | */ |
589 | ||
355d95a1 | 590 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
1da177e4 | 591 | { |
edc6afc5 | 592 | struct ktermios tmp_termios; |
1da177e4 LT |
593 | struct tty_ldisc *ld; |
594 | int retval = tty_check_change(tty); | |
595 | ||
596 | if (retval) | |
597 | return retval; | |
598 | ||
6a1c0680 | 599 | down_read(&tty->termios_rwsem); |
adc8d746 | 600 | tmp_termios = tty->termios; |
6a1c0680 | 601 | up_read(&tty->termios_rwsem); |
64bb6c5e | 602 | |
1da177e4 | 603 | if (opt & TERMIOS_TERMIO) { |
1da177e4 LT |
604 | if (user_termio_to_kernel_termios(&tmp_termios, |
605 | (struct termio __user *)arg)) | |
606 | return -EFAULT; | |
edc6afc5 AC |
607 | #ifdef TCGETS2 |
608 | } else if (opt & TERMIOS_OLD) { | |
edc6afc5 | 609 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
64bb6c5e | 610 | (struct termios __user *)arg)) |
edc6afc5 | 611 | return -EFAULT; |
1da177e4 LT |
612 | } else { |
613 | if (user_termios_to_kernel_termios(&tmp_termios, | |
64bb6c5e | 614 | (struct termios2 __user *)arg)) |
1da177e4 LT |
615 | return -EFAULT; |
616 | } | |
64bb6c5e AC |
617 | #else |
618 | } else if (user_termios_to_kernel_termios(&tmp_termios, | |
619 | (struct termios __user *)arg)) | |
620 | return -EFAULT; | |
621 | #endif | |
1da177e4 | 622 | |
355d95a1 AC |
623 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
624 | * with the real speed so its unconditionally usable */ | |
edc6afc5 AC |
625 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
626 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); | |
627 | ||
1da177e4 | 628 | ld = tty_ldisc_ref(tty); |
355d95a1 | 629 | |
1da177e4 | 630 | if (ld != NULL) { |
a352def2 AC |
631 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
632 | ld->ops->flush_buffer(tty); | |
1da177e4 LT |
633 | tty_ldisc_deref(ld); |
634 | } | |
355d95a1 | 635 | |
1da177e4 LT |
636 | if (opt & TERMIOS_WAIT) { |
637 | tty_wait_until_sent(tty, 0); | |
638 | if (signal_pending(current)) | |
183d95cd | 639 | return -ERESTARTSYS; |
1da177e4 LT |
640 | } |
641 | ||
8d075b19 | 642 | tty_set_termios(tty, &tmp_termios); |
5f519d72 AC |
643 | |
644 | /* FIXME: Arguably if tmp_termios == tty->termios AND the | |
645 | actual requested termios was not tmp_termios then we may | |
646 | want to return an error as no user requested change has | |
647 | succeeded */ | |
1da177e4 LT |
648 | return 0; |
649 | } | |
650 | ||
26a2e20f AC |
651 | static void copy_termios(struct tty_struct *tty, struct ktermios *kterm) |
652 | { | |
6a1c0680 | 653 | down_read(&tty->termios_rwsem); |
adc8d746 | 654 | *kterm = tty->termios; |
6a1c0680 | 655 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
656 | } |
657 | ||
658 | static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) | |
659 | { | |
6a1c0680 | 660 | down_read(&tty->termios_rwsem); |
adc8d746 | 661 | *kterm = tty->termios_locked; |
6a1c0680 | 662 | up_read(&tty->termios_rwsem); |
26a2e20f AC |
663 | } |
664 | ||
355d95a1 | 665 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
1da177e4 | 666 | { |
26a2e20f AC |
667 | struct ktermios kterm; |
668 | copy_termios(tty, &kterm); | |
669 | if (kernel_termios_to_user_termio(termio, &kterm)) | |
1da177e4 LT |
670 | return -EFAULT; |
671 | return 0; | |
672 | } | |
673 | ||
1d65b4a0 AC |
674 | |
675 | #ifdef TCGETX | |
676 | ||
677 | /** | |
678 | * set_termiox - set termiox fields if possible | |
679 | * @tty: terminal | |
680 | * @arg: termiox structure from user | |
681 | * @opt: option flags for ioctl type | |
682 | * | |
683 | * Implement the device calling points for the SYS5 termiox ioctl | |
684 | * interface in Linux | |
685 | */ | |
686 | ||
687 | static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) | |
688 | { | |
689 | struct termiox tnew; | |
690 | struct tty_ldisc *ld; | |
691 | ||
692 | if (tty->termiox == NULL) | |
693 | return -EINVAL; | |
694 | if (copy_from_user(&tnew, arg, sizeof(struct termiox))) | |
695 | return -EFAULT; | |
696 | ||
697 | ld = tty_ldisc_ref(tty); | |
698 | if (ld != NULL) { | |
699 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) | |
700 | ld->ops->flush_buffer(tty); | |
701 | tty_ldisc_deref(ld); | |
702 | } | |
703 | if (opt & TERMIOS_WAIT) { | |
704 | tty_wait_until_sent(tty, 0); | |
705 | if (signal_pending(current)) | |
183d95cd | 706 | return -ERESTARTSYS; |
1d65b4a0 AC |
707 | } |
708 | ||
6a1c0680 | 709 | down_write(&tty->termios_rwsem); |
1d65b4a0 AC |
710 | if (tty->ops->set_termiox) |
711 | tty->ops->set_termiox(tty, &tnew); | |
6a1c0680 | 712 | up_write(&tty->termios_rwsem); |
1d65b4a0 AC |
713 | return 0; |
714 | } | |
715 | ||
716 | #endif | |
717 | ||
1da177e4 LT |
718 | |
719 | #ifdef TIOCGETP | |
720 | /* | |
721 | * These are deprecated, but there is limited support.. | |
722 | * | |
723 | * The "sg_flags" translation is a joke.. | |
724 | */ | |
355d95a1 | 725 | static int get_sgflags(struct tty_struct *tty) |
1da177e4 LT |
726 | { |
727 | int flags = 0; | |
728 | ||
adc8d746 AC |
729 | if (!(tty->termios.c_lflag & ICANON)) { |
730 | if (tty->termios.c_lflag & ISIG) | |
1da177e4 LT |
731 | flags |= 0x02; /* cbreak */ |
732 | else | |
733 | flags |= 0x20; /* raw */ | |
734 | } | |
adc8d746 | 735 | if (tty->termios.c_lflag & ECHO) |
1da177e4 | 736 | flags |= 0x08; /* echo */ |
adc8d746 AC |
737 | if (tty->termios.c_oflag & OPOST) |
738 | if (tty->termios.c_oflag & ONLCR) | |
1da177e4 LT |
739 | flags |= 0x10; /* crmod */ |
740 | return flags; | |
741 | } | |
742 | ||
355d95a1 | 743 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
744 | { |
745 | struct sgttyb tmp; | |
746 | ||
6a1c0680 | 747 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
748 | tmp.sg_ispeed = tty->termios.c_ispeed; |
749 | tmp.sg_ospeed = tty->termios.c_ospeed; | |
750 | tmp.sg_erase = tty->termios.c_cc[VERASE]; | |
751 | tmp.sg_kill = tty->termios.c_cc[VKILL]; | |
1da177e4 | 752 | tmp.sg_flags = get_sgflags(tty); |
6a1c0680 | 753 | up_read(&tty->termios_rwsem); |
355d95a1 | 754 | |
1da177e4 LT |
755 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
756 | } | |
757 | ||
355d95a1 | 758 | static void set_sgflags(struct ktermios *termios, int flags) |
1da177e4 | 759 | { |
9833facf AC |
760 | termios->c_iflag = ICRNL | IXON; |
761 | termios->c_oflag = 0; | |
762 | termios->c_lflag = ISIG | ICANON; | |
1da177e4 | 763 | if (flags & 0x02) { /* cbreak */ |
9833facf AC |
764 | termios->c_iflag = 0; |
765 | termios->c_lflag &= ~ICANON; | |
1da177e4 LT |
766 | } |
767 | if (flags & 0x08) { /* echo */ | |
9833facf | 768 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
1da177e4 LT |
769 | ECHOCTL | ECHOKE | IEXTEN; |
770 | } | |
771 | if (flags & 0x10) { /* crmod */ | |
9833facf | 772 | termios->c_oflag |= OPOST | ONLCR; |
1da177e4 LT |
773 | } |
774 | if (flags & 0x20) { /* raw */ | |
9833facf AC |
775 | termios->c_iflag = 0; |
776 | termios->c_lflag &= ~(ISIG | ICANON); | |
1da177e4 | 777 | } |
9833facf AC |
778 | if (!(termios->c_lflag & ICANON)) { |
779 | termios->c_cc[VMIN] = 1; | |
780 | termios->c_cc[VTIME] = 0; | |
1da177e4 LT |
781 | } |
782 | } | |
783 | ||
af9b897e AC |
784 | /** |
785 | * set_sgttyb - set legacy terminal values | |
786 | * @tty: tty structure | |
787 | * @sgttyb: pointer to old style terminal structure | |
788 | * | |
789 | * Updates a terminal from the legacy BSD style terminal information | |
790 | * structure. | |
791 | * | |
6a1c0680 | 792 | * Locking: termios_rwsem |
af9b897e AC |
793 | */ |
794 | ||
355d95a1 | 795 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
1da177e4 LT |
796 | { |
797 | int retval; | |
798 | struct sgttyb tmp; | |
edc6afc5 | 799 | struct ktermios termios; |
1da177e4 LT |
800 | |
801 | retval = tty_check_change(tty); | |
802 | if (retval) | |
803 | return retval; | |
355d95a1 | 804 | |
1da177e4 LT |
805 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
806 | return -EFAULT; | |
807 | ||
6a1c0680 | 808 | down_write(&tty->termios_rwsem); |
adc8d746 | 809 | termios = tty->termios; |
1da177e4 LT |
810 | termios.c_cc[VERASE] = tmp.sg_erase; |
811 | termios.c_cc[VKILL] = tmp.sg_kill; | |
812 | set_sgflags(&termios, tmp.sg_flags); | |
edc6afc5 AC |
813 | /* Try and encode into Bfoo format */ |
814 | #ifdef BOTHER | |
355d95a1 AC |
815 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
816 | termios.c_ospeed); | |
edc6afc5 | 817 | #endif |
6a1c0680 | 818 | up_write(&tty->termios_rwsem); |
8d075b19 | 819 | tty_set_termios(tty, &termios); |
1da177e4 LT |
820 | return 0; |
821 | } | |
822 | #endif | |
823 | ||
824 | #ifdef TIOCGETC | |
355d95a1 | 825 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
826 | { |
827 | struct tchars tmp; | |
828 | ||
6a1c0680 | 829 | down_read(&tty->termios_rwsem); |
adc8d746 AC |
830 | tmp.t_intrc = tty->termios.c_cc[VINTR]; |
831 | tmp.t_quitc = tty->termios.c_cc[VQUIT]; | |
832 | tmp.t_startc = tty->termios.c_cc[VSTART]; | |
833 | tmp.t_stopc = tty->termios.c_cc[VSTOP]; | |
834 | tmp.t_eofc = tty->termios.c_cc[VEOF]; | |
835 | tmp.t_brkc = tty->termios.c_cc[VEOL2]; /* what is brkc anyway? */ | |
6a1c0680 | 836 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
837 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
838 | } | |
839 | ||
355d95a1 | 840 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
1da177e4 LT |
841 | { |
842 | struct tchars tmp; | |
843 | ||
844 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) | |
845 | return -EFAULT; | |
6a1c0680 | 846 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
847 | tty->termios.c_cc[VINTR] = tmp.t_intrc; |
848 | tty->termios.c_cc[VQUIT] = tmp.t_quitc; | |
849 | tty->termios.c_cc[VSTART] = tmp.t_startc; | |
850 | tty->termios.c_cc[VSTOP] = tmp.t_stopc; | |
851 | tty->termios.c_cc[VEOF] = tmp.t_eofc; | |
852 | tty->termios.c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ | |
6a1c0680 | 853 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
854 | return 0; |
855 | } | |
856 | #endif | |
857 | ||
858 | #ifdef TIOCGLTC | |
355d95a1 | 859 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
860 | { |
861 | struct ltchars tmp; | |
862 | ||
6a1c0680 | 863 | down_read(&tty->termios_rwsem); |
adc8d746 | 864 | tmp.t_suspc = tty->termios.c_cc[VSUSP]; |
355d95a1 | 865 | /* what is dsuspc anyway? */ |
adc8d746 AC |
866 | tmp.t_dsuspc = tty->termios.c_cc[VSUSP]; |
867 | tmp.t_rprntc = tty->termios.c_cc[VREPRINT]; | |
355d95a1 | 868 | /* what is flushc anyway? */ |
adc8d746 AC |
869 | tmp.t_flushc = tty->termios.c_cc[VEOL2]; |
870 | tmp.t_werasc = tty->termios.c_cc[VWERASE]; | |
871 | tmp.t_lnextc = tty->termios.c_cc[VLNEXT]; | |
6a1c0680 | 872 | up_read(&tty->termios_rwsem); |
1da177e4 LT |
873 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
874 | } | |
875 | ||
355d95a1 | 876 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
1da177e4 LT |
877 | { |
878 | struct ltchars tmp; | |
879 | ||
880 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) | |
881 | return -EFAULT; | |
882 | ||
6a1c0680 | 883 | down_write(&tty->termios_rwsem); |
adc8d746 | 884 | tty->termios.c_cc[VSUSP] = tmp.t_suspc; |
355d95a1 | 885 | /* what is dsuspc anyway? */ |
adc8d746 AC |
886 | tty->termios.c_cc[VEOL2] = tmp.t_dsuspc; |
887 | tty->termios.c_cc[VREPRINT] = tmp.t_rprntc; | |
355d95a1 | 888 | /* what is flushc anyway? */ |
adc8d746 AC |
889 | tty->termios.c_cc[VEOL2] = tmp.t_flushc; |
890 | tty->termios.c_cc[VWERASE] = tmp.t_werasc; | |
891 | tty->termios.c_cc[VLNEXT] = tmp.t_lnextc; | |
6a1c0680 | 892 | up_write(&tty->termios_rwsem); |
1da177e4 LT |
893 | return 0; |
894 | } | |
895 | #endif | |
896 | ||
1c2630cc AC |
897 | /** |
898 | * tty_change_softcar - carrier change ioctl helper | |
899 | * @tty: tty to update | |
900 | * @arg: enable/disable CLOCAL | |
901 | * | |
902 | * Perform a change to the CLOCAL state and call into the driver | |
6a1c0680 | 903 | * layer to make it visible. All done with the termios rwsem |
1c2630cc AC |
904 | */ |
905 | ||
906 | static int tty_change_softcar(struct tty_struct *tty, int arg) | |
907 | { | |
908 | int ret = 0; | |
909 | int bit = arg ? CLOCAL : 0; | |
f34d7a5b | 910 | struct ktermios old; |
1c2630cc | 911 | |
6a1c0680 | 912 | down_write(&tty->termios_rwsem); |
adc8d746 AC |
913 | old = tty->termios; |
914 | tty->termios.c_cflag &= ~CLOCAL; | |
915 | tty->termios.c_cflag |= bit; | |
f34d7a5b AC |
916 | if (tty->ops->set_termios) |
917 | tty->ops->set_termios(tty, &old); | |
adc8d746 | 918 | if ((tty->termios.c_cflag & CLOCAL) != bit) |
1c2630cc | 919 | ret = -EINVAL; |
6a1c0680 | 920 | up_write(&tty->termios_rwsem); |
1c2630cc AC |
921 | return ret; |
922 | } | |
923 | ||
0fc00e24 AC |
924 | /** |
925 | * tty_mode_ioctl - mode related ioctls | |
926 | * @tty: tty for the ioctl | |
927 | * @file: file pointer for the tty | |
928 | * @cmd: command | |
929 | * @arg: ioctl argument | |
930 | * | |
931 | * Perform non line discipline specific mode control ioctls. This | |
932 | * is designed to be called by line disciplines to ensure they provide | |
933 | * consistent mode setting. | |
934 | */ | |
935 | ||
355d95a1 | 936 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
0fc00e24 | 937 | unsigned int cmd, unsigned long arg) |
1da177e4 | 938 | { |
355d95a1 | 939 | struct tty_struct *real_tty; |
1da177e4 | 940 | void __user *p = (void __user *)arg; |
8f520021 | 941 | int ret = 0; |
26a2e20f | 942 | struct ktermios kterm; |
1da177e4 | 943 | |
8d075b19 AC |
944 | BUG_ON(file == NULL); |
945 | ||
1da177e4 LT |
946 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
947 | tty->driver->subtype == PTY_TYPE_MASTER) | |
948 | real_tty = tty->link; | |
949 | else | |
950 | real_tty = tty; | |
951 | ||
952 | switch (cmd) { | |
953 | #ifdef TIOCGETP | |
355d95a1 AC |
954 | case TIOCGETP: |
955 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
956 | case TIOCSETP: | |
957 | case TIOCSETN: | |
958 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); | |
1da177e4 LT |
959 | #endif |
960 | #ifdef TIOCGETC | |
355d95a1 AC |
961 | case TIOCGETC: |
962 | return get_tchars(real_tty, p); | |
963 | case TIOCSETC: | |
964 | return set_tchars(real_tty, p); | |
1da177e4 LT |
965 | #endif |
966 | #ifdef TIOCGLTC | |
355d95a1 AC |
967 | case TIOCGLTC: |
968 | return get_ltchars(real_tty, p); | |
969 | case TIOCSLTC: | |
970 | return set_ltchars(real_tty, p); | |
1da177e4 | 971 | #endif |
355d95a1 AC |
972 | case TCSETSF: |
973 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); | |
974 | case TCSETSW: | |
975 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); | |
976 | case TCSETS: | |
977 | return set_termios(real_tty, p, TERMIOS_OLD); | |
edc6afc5 | 978 | #ifndef TCGETS2 |
355d95a1 | 979 | case TCGETS: |
26a2e20f AC |
980 | copy_termios(real_tty, &kterm); |
981 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 982 | ret = -EFAULT; |
8f520021 | 983 | return ret; |
edc6afc5 | 984 | #else |
355d95a1 | 985 | case TCGETS: |
26a2e20f AC |
986 | copy_termios(real_tty, &kterm); |
987 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 988 | ret = -EFAULT; |
8f520021 | 989 | return ret; |
355d95a1 | 990 | case TCGETS2: |
26a2e20f AC |
991 | copy_termios(real_tty, &kterm); |
992 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) | |
8f520021 | 993 | ret = -EFAULT; |
8f520021 | 994 | return ret; |
355d95a1 AC |
995 | case TCSETSF2: |
996 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); | |
997 | case TCSETSW2: | |
998 | return set_termios(real_tty, p, TERMIOS_WAIT); | |
999 | case TCSETS2: | |
1000 | return set_termios(real_tty, p, 0); | |
edc6afc5 | 1001 | #endif |
355d95a1 AC |
1002 | case TCGETA: |
1003 | return get_termio(real_tty, p); | |
1004 | case TCSETAF: | |
1005 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); | |
1006 | case TCSETAW: | |
1007 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); | |
1008 | case TCSETA: | |
1009 | return set_termios(real_tty, p, TERMIOS_TERMIO); | |
0fc00e24 | 1010 | #ifndef TCGETS2 |
355d95a1 | 1011 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1012 | copy_termios_locked(real_tty, &kterm); |
1013 | if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) | |
8f520021 | 1014 | ret = -EFAULT; |
8f520021 | 1015 | return ret; |
355d95a1 AC |
1016 | case TIOCSLCKTRMIOS: |
1017 | if (!capable(CAP_SYS_ADMIN)) | |
1018 | return -EPERM; | |
26a2e20f AC |
1019 | copy_termios_locked(real_tty, &kterm); |
1020 | if (user_termios_to_kernel_termios(&kterm, | |
355d95a1 | 1021 | (struct termios __user *) arg)) |
26a2e20f | 1022 | return -EFAULT; |
6a1c0680 | 1023 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 1024 | real_tty->termios_locked = kterm; |
6a1c0680 | 1025 | up_write(&real_tty->termios_rwsem); |
26a2e20f | 1026 | return 0; |
0fc00e24 | 1027 | #else |
355d95a1 | 1028 | case TIOCGLCKTRMIOS: |
26a2e20f AC |
1029 | copy_termios_locked(real_tty, &kterm); |
1030 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) | |
8f520021 | 1031 | ret = -EFAULT; |
8f520021 | 1032 | return ret; |
355d95a1 AC |
1033 | case TIOCSLCKTRMIOS: |
1034 | if (!capable(CAP_SYS_ADMIN)) | |
26a2e20f AC |
1035 | return -EPERM; |
1036 | copy_termios_locked(real_tty, &kterm); | |
1037 | if (user_termios_to_kernel_termios_1(&kterm, | |
355d95a1 | 1038 | (struct termios __user *) arg)) |
26a2e20f | 1039 | return -EFAULT; |
6a1c0680 | 1040 | down_write(&real_tty->termios_rwsem); |
adc8d746 | 1041 | real_tty->termios_locked = kterm; |
6a1c0680 | 1042 | up_write(&real_tty->termios_rwsem); |
8f520021 | 1043 | return ret; |
0fc00e24 | 1044 | #endif |
1d65b4a0 | 1045 | #ifdef TCGETX |
5dca607b MF |
1046 | case TCGETX: { |
1047 | struct termiox ktermx; | |
1d65b4a0 AC |
1048 | if (real_tty->termiox == NULL) |
1049 | return -EINVAL; | |
6a1c0680 | 1050 | down_read(&real_tty->termios_rwsem); |
26a2e20f | 1051 | memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); |
6a1c0680 | 1052 | up_read(&real_tty->termios_rwsem); |
26a2e20f AC |
1053 | if (copy_to_user(p, &ktermx, sizeof(struct termiox))) |
1054 | ret = -EFAULT; | |
8f520021 | 1055 | return ret; |
5dca607b | 1056 | } |
1d65b4a0 AC |
1057 | case TCSETX: |
1058 | return set_termiox(real_tty, p, 0); | |
1059 | case TCSETXW: | |
1060 | return set_termiox(real_tty, p, TERMIOS_WAIT); | |
1061 | case TCSETXF: | |
1062 | return set_termiox(real_tty, p, TERMIOS_FLUSH); | |
1063 | #endif | |
355d95a1 | 1064 | case TIOCGSOFTCAR: |
26a2e20f AC |
1065 | copy_termios(real_tty, &kterm); |
1066 | ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, | |
355d95a1 | 1067 | (int __user *)arg); |
8f520021 | 1068 | return ret; |
355d95a1 AC |
1069 | case TIOCSSOFTCAR: |
1070 | if (get_user(arg, (unsigned int __user *) arg)) | |
1071 | return -EFAULT; | |
f753f327 | 1072 | return tty_change_softcar(real_tty, arg); |
355d95a1 AC |
1073 | default: |
1074 | return -ENOIOCTLCMD; | |
0fc00e24 AC |
1075 | } |
1076 | } | |
0fc00e24 AC |
1077 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
1078 | ||
e7f3880c PH |
1079 | |
1080 | /* Caller guarantees ldisc reference is held */ | |
1081 | static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
0fc00e24 | 1082 | { |
e7f3880c | 1083 | struct tty_ldisc *ld = tty->ldisc; |
0fc00e24 | 1084 | |
0fc00e24 AC |
1085 | switch (arg) { |
1086 | case TCIFLUSH: | |
a1bf9584 | 1087 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 1088 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
1089 | tty_unthrottle(tty); |
1090 | } | |
0fc00e24 AC |
1091 | break; |
1092 | case TCIOFLUSH: | |
a1bf9584 | 1093 | if (ld && ld->ops->flush_buffer) { |
a352def2 | 1094 | ld->ops->flush_buffer(tty); |
a1bf9584 IZ |
1095 | tty_unthrottle(tty); |
1096 | } | |
0fc00e24 AC |
1097 | /* fall through */ |
1098 | case TCOFLUSH: | |
f34d7a5b | 1099 | tty_driver_flush_buffer(tty); |
0fc00e24 AC |
1100 | break; |
1101 | default: | |
0fc00e24 AC |
1102 | return -EINVAL; |
1103 | } | |
0fc00e24 AC |
1104 | return 0; |
1105 | } | |
e7f3880c PH |
1106 | |
1107 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) | |
1108 | { | |
1109 | struct tty_ldisc *ld; | |
1110 | int retval = tty_check_change(tty); | |
1111 | if (retval) | |
1112 | return retval; | |
1113 | ||
1114 | ld = tty_ldisc_ref_wait(tty); | |
1115 | retval = __tty_perform_flush(tty, arg); | |
1116 | if (ld) | |
1117 | tty_ldisc_deref(ld); | |
1118 | return retval; | |
1119 | } | |
0fc00e24 AC |
1120 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
1121 | ||
47afa7a5 | 1122 | int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, |
0fc00e24 AC |
1123 | unsigned int cmd, unsigned long arg) |
1124 | { | |
0fc00e24 AC |
1125 | int retval; |
1126 | ||
0fc00e24 | 1127 | switch (cmd) { |
355d95a1 AC |
1128 | case TCXONC: |
1129 | retval = tty_check_change(tty); | |
1130 | if (retval) | |
1131 | return retval; | |
1132 | switch (arg) { | |
1133 | case TCOOFF: | |
c545b66c | 1134 | spin_lock_irq(&tty->flow_lock); |
355d95a1 AC |
1135 | if (!tty->flow_stopped) { |
1136 | tty->flow_stopped = 1; | |
c545b66c | 1137 | __stop_tty(tty); |
1da177e4 | 1138 | } |
c545b66c | 1139 | spin_unlock_irq(&tty->flow_lock); |
355d95a1 AC |
1140 | break; |
1141 | case TCOON: | |
c545b66c | 1142 | spin_lock_irq(&tty->flow_lock); |
355d95a1 AC |
1143 | if (tty->flow_stopped) { |
1144 | tty->flow_stopped = 0; | |
c545b66c | 1145 | __start_tty(tty); |
355d95a1 | 1146 | } |
c545b66c | 1147 | spin_unlock_irq(&tty->flow_lock); |
355d95a1 AC |
1148 | break; |
1149 | case TCIOFF: | |
1150 | if (STOP_CHAR(tty) != __DISABLED_CHAR) | |
c274f6ef | 1151 | retval = tty_send_xchar(tty, STOP_CHAR(tty)); |
355d95a1 AC |
1152 | break; |
1153 | case TCION: | |
1154 | if (START_CHAR(tty) != __DISABLED_CHAR) | |
c274f6ef | 1155 | retval = tty_send_xchar(tty, START_CHAR(tty)); |
355d95a1 | 1156 | break; |
1da177e4 | 1157 | default: |
355d95a1 | 1158 | return -EINVAL; |
1da177e4 | 1159 | } |
c274f6ef | 1160 | return retval; |
355d95a1 | 1161 | case TCFLSH: |
5cec7bf6 PH |
1162 | retval = tty_check_change(tty); |
1163 | if (retval) | |
1164 | return retval; | |
e7f3880c | 1165 | return __tty_perform_flush(tty, arg); |
355d95a1 AC |
1166 | default: |
1167 | /* Try the mode commands */ | |
1168 | return tty_mode_ioctl(tty, file, cmd, arg); | |
1169 | } | |
1da177e4 | 1170 | } |
47afa7a5 | 1171 | EXPORT_SYMBOL(n_tty_ioctl_helper); |
8193c429 TM |
1172 | |
1173 | #ifdef CONFIG_COMPAT | |
1174 | long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, | |
1175 | unsigned int cmd, unsigned long arg) | |
1176 | { | |
1177 | switch (cmd) { | |
1178 | case TIOCGLCKTRMIOS: | |
1179 | case TIOCSLCKTRMIOS: | |
1180 | return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg)); | |
1181 | default: | |
1182 | return -ENOIOCTLCMD; | |
1183 | } | |
1184 | } | |
1185 | EXPORT_SYMBOL(n_tty_compat_ioctl_helper); | |
1186 | #endif | |
1187 |