Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/char/tty_ioctl.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 5 | * |
| 6 | * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines |
| 7 | * which can be dynamically activated and de-activated by the line |
| 8 | * discipline handling modules (like SLIP). |
| 9 | */ |
| 10 | |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/termios.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/major.h> |
| 17 | #include <linux/tty.h> |
| 18 | #include <linux/fcntl.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/mm.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/bitops.h> |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 23 | #include <linux/mutex.h> |
Alan Cox | 0ee9cbb | 2008-04-30 00:53:32 -0700 | [diff] [blame] | 24 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include <asm/io.h> |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/system.h> |
| 29 | |
| 30 | #undef TTY_DEBUG_WAIT_UNTIL_SENT |
| 31 | |
| 32 | #undef DEBUG |
| 33 | |
| 34 | /* |
| 35 | * Internal flag options for termios setting behavior |
| 36 | */ |
| 37 | #define TERMIOS_FLUSH 1 |
| 38 | #define TERMIOS_WAIT 2 |
| 39 | #define TERMIOS_TERMIO 4 |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 40 | #define TERMIOS_OLD 8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 42 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 43 | int tty_chars_in_buffer(struct tty_struct *tty) |
| 44 | { |
| 45 | if (tty->ops->chars_in_buffer) |
| 46 | return tty->ops->chars_in_buffer(tty); |
| 47 | else |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | EXPORT_SYMBOL(tty_chars_in_buffer); |
| 52 | |
| 53 | int tty_write_room(struct tty_struct *tty) |
| 54 | { |
| 55 | if (tty->ops->write_room) |
| 56 | return tty->ops->write_room(tty); |
| 57 | return 2048; |
| 58 | } |
| 59 | |
| 60 | EXPORT_SYMBOL(tty_write_room); |
| 61 | |
| 62 | void tty_driver_flush_buffer(struct tty_struct *tty) |
| 63 | { |
| 64 | if (tty->ops->flush_buffer) |
| 65 | tty->ops->flush_buffer(tty); |
| 66 | } |
| 67 | |
| 68 | EXPORT_SYMBOL(tty_driver_flush_buffer); |
| 69 | |
Alan Cox | 39c2e60 | 2008-04-30 00:54:18 -0700 | [diff] [blame] | 70 | void tty_throttle(struct tty_struct *tty) |
| 71 | { |
| 72 | /* check TTY_THROTTLED first so it indicates our state */ |
| 73 | if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && |
| 74 | tty->ops->throttle) |
| 75 | tty->ops->throttle(tty); |
| 76 | } |
| 77 | EXPORT_SYMBOL(tty_throttle); |
| 78 | |
| 79 | void tty_unthrottle(struct tty_struct *tty) |
| 80 | { |
| 81 | if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && |
| 82 | tty->ops->unthrottle) |
| 83 | tty->ops->unthrottle(tty); |
| 84 | } |
| 85 | EXPORT_SYMBOL(tty_unthrottle); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 86 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 87 | /** |
| 88 | * tty_wait_until_sent - wait for I/O to finish |
| 89 | * @tty: tty we are waiting for |
| 90 | * @timeout: how long we will wait |
| 91 | * |
| 92 | * Wait for characters pending in a tty driver to hit the wire, or |
| 93 | * for a timeout to occur (eg due to flow control) |
| 94 | * |
| 95 | * Locking: none |
| 96 | */ |
| 97 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 98 | void tty_wait_until_sent(struct tty_struct *tty, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #ifdef TTY_DEBUG_WAIT_UNTIL_SENT |
| 101 | char buf[64]; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf)); |
| 104 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | if (!timeout) |
| 106 | timeout = MAX_SCHEDULE_TIMEOUT; |
Jiri Slaby | 5a52bd4 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 107 | if (wait_event_interruptible_timeout(tty->write_wait, |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 108 | !tty_chars_in_buffer(tty), timeout) >= 0) { |
| 109 | if (tty->ops->wait_until_sent) |
| 110 | tty->ops->wait_until_sent(tty, timeout); |
Alan Cox | 0ee9cbb | 2008-04-30 00:53:32 -0700 | [diff] [blame] | 111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | EXPORT_SYMBOL(tty_wait_until_sent); |
| 114 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 115 | static void unset_locked_termios(struct ktermios *termios, |
| 116 | struct ktermios *old, |
| 117 | struct ktermios *locked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
| 119 | int i; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 120 | |
| 121 | #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | if (!locked) { |
| 124 | printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n"); |
| 125 | return; |
| 126 | } |
| 127 | |
| 128 | NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); |
| 129 | NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); |
| 130 | NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); |
| 131 | NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); |
| 132 | termios->c_line = locked->c_line ? old->c_line : termios->c_line; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 133 | for (i = 0; i < NCCS; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | termios->c_cc[i] = locked->c_cc[i] ? |
| 135 | old->c_cc[i] : termios->c_cc[i]; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 136 | /* FIXME: What should we do for i/ospeed */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 139 | /* |
| 140 | * Routine which returns the baud rate of the tty |
| 141 | * |
| 142 | * Note that the baud_table needs to be kept in sync with the |
| 143 | * include/asm/termbits.h file. |
| 144 | */ |
| 145 | static const speed_t baud_table[] = { |
| 146 | 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, |
| 147 | 9600, 19200, 38400, 57600, 115200, 230400, 460800, |
| 148 | #ifdef __sparc__ |
| 149 | 76800, 153600, 307200, 614400, 921600 |
| 150 | #else |
| 151 | 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, |
| 152 | 2500000, 3000000, 3500000, 4000000 |
| 153 | #endif |
| 154 | }; |
| 155 | |
| 156 | #ifndef __sparc__ |
| 157 | static const tcflag_t baud_bits[] = { |
| 158 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 159 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 160 | B57600, B115200, B230400, B460800, B500000, B576000, |
| 161 | B921600, B1000000, B1152000, B1500000, B2000000, B2500000, |
| 162 | B3000000, B3500000, B4000000 |
| 163 | }; |
| 164 | #else |
| 165 | static const tcflag_t baud_bits[] = { |
| 166 | B0, B50, B75, B110, B134, B150, B200, B300, B600, |
| 167 | B1200, B1800, B2400, B4800, B9600, B19200, B38400, |
| 168 | B57600, B115200, B230400, B460800, B76800, B153600, |
| 169 | B307200, B614400, B921600 |
| 170 | }; |
| 171 | #endif |
| 172 | |
| 173 | static int n_baud_table = ARRAY_SIZE(baud_table); |
| 174 | |
| 175 | /** |
| 176 | * tty_termios_baud_rate |
| 177 | * @termios: termios structure |
| 178 | * |
| 179 | * Convert termios baud rate data into a speed. This should be called |
| 180 | * with the termios lock held if this termios is a terminal termios |
| 181 | * structure. May change the termios data. Device drivers can call this |
| 182 | * function but should use ->c_[io]speed directly as they are updated. |
| 183 | * |
| 184 | * Locking: none |
| 185 | */ |
| 186 | |
| 187 | speed_t tty_termios_baud_rate(struct ktermios *termios) |
| 188 | { |
| 189 | unsigned int cbaud; |
| 190 | |
| 191 | cbaud = termios->c_cflag & CBAUD; |
| 192 | |
| 193 | #ifdef BOTHER |
| 194 | /* Magic token for arbitary speed via c_ispeed/c_ospeed */ |
| 195 | if (cbaud == BOTHER) |
| 196 | return termios->c_ospeed; |
| 197 | #endif |
| 198 | if (cbaud & CBAUDEX) { |
| 199 | cbaud &= ~CBAUDEX; |
| 200 | |
| 201 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 202 | termios->c_cflag &= ~CBAUDEX; |
| 203 | else |
| 204 | cbaud += 15; |
| 205 | } |
| 206 | return baud_table[cbaud]; |
| 207 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 208 | EXPORT_SYMBOL(tty_termios_baud_rate); |
| 209 | |
| 210 | /** |
| 211 | * tty_termios_input_baud_rate |
| 212 | * @termios: termios structure |
| 213 | * |
| 214 | * Convert termios baud rate data into a speed. This should be called |
| 215 | * with the termios lock held if this termios is a terminal termios |
| 216 | * structure. May change the termios data. Device drivers can call this |
| 217 | * function but should use ->c_[io]speed directly as they are updated. |
| 218 | * |
| 219 | * Locking: none |
| 220 | */ |
| 221 | |
| 222 | speed_t tty_termios_input_baud_rate(struct ktermios *termios) |
| 223 | { |
| 224 | #ifdef IBSHIFT |
| 225 | unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD; |
| 226 | |
| 227 | if (cbaud == B0) |
| 228 | return tty_termios_baud_rate(termios); |
| 229 | |
| 230 | /* Magic token for arbitary speed via c_ispeed*/ |
| 231 | if (cbaud == BOTHER) |
| 232 | return termios->c_ispeed; |
| 233 | |
| 234 | if (cbaud & CBAUDEX) { |
| 235 | cbaud &= ~CBAUDEX; |
| 236 | |
| 237 | if (cbaud < 1 || cbaud + 15 > n_baud_table) |
| 238 | termios->c_cflag &= ~(CBAUDEX << IBSHIFT); |
| 239 | else |
| 240 | cbaud += 15; |
| 241 | } |
| 242 | return baud_table[cbaud]; |
| 243 | #else |
| 244 | return tty_termios_baud_rate(termios); |
| 245 | #endif |
| 246 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 247 | EXPORT_SYMBOL(tty_termios_input_baud_rate); |
| 248 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 249 | /** |
| 250 | * tty_termios_encode_baud_rate |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 251 | * @termios: ktermios structure holding user requested state |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 252 | * @ispeed: input speed |
| 253 | * @ospeed: output speed |
| 254 | * |
| 255 | * Encode the speeds set into the passed termios structure. This is |
| 256 | * used as a library helper for drivers os that they can report back |
| 257 | * the actual speed selected when it differs from the speed requested |
| 258 | * |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 259 | * For maximal back compatibility with legacy SYS5/POSIX *nix behaviour |
| 260 | * we need to carefully set the bits when the user does not get the |
| 261 | * desired speed. We allow small margins and preserve as much of possible |
| 262 | * of the input intent to keep compatiblity. |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 263 | * |
| 264 | * Locking: Caller should hold termios lock. This is already held |
| 265 | * when calling this function from the driver termios handler. |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 266 | * |
| 267 | * The ifdefs deal with platforms whose owners have yet to update them |
| 268 | * and will all go away once this is done. |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 269 | */ |
| 270 | |
Maciej W. Rozycki | 75e8b71 | 2007-10-18 03:04:35 -0700 | [diff] [blame] | 271 | void tty_termios_encode_baud_rate(struct ktermios *termios, |
| 272 | speed_t ibaud, speed_t obaud) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 273 | { |
| 274 | int i = 0; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 275 | int ifound = -1, ofound = -1; |
| 276 | int iclose = ibaud/50, oclose = obaud/50; |
| 277 | int ibinput = 0; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 278 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 279 | if (obaud == 0) /* CD dropped */ |
| 280 | ibaud = 0; /* Clear ibaud to be sure */ |
| 281 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 282 | termios->c_ispeed = ibaud; |
| 283 | termios->c_ospeed = obaud; |
| 284 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 285 | #ifdef BOTHER |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 286 | /* If the user asked for a precise weird speed give a precise weird |
| 287 | answer. If they asked for a Bfoo speed they many have problems |
| 288 | digesting non-exact replies so fuzz a bit */ |
| 289 | |
| 290 | if ((termios->c_cflag & CBAUD) == BOTHER) |
| 291 | oclose = 0; |
| 292 | if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER) |
| 293 | iclose = 0; |
| 294 | if ((termios->c_cflag >> IBSHIFT) & CBAUD) |
| 295 | ibinput = 1; /* An input speed was specified */ |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 296 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 297 | termios->c_cflag &= ~CBAUD; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 298 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 299 | /* |
| 300 | * Our goal is to find a close match to the standard baud rate |
| 301 | * returned. Walk the baud rate table and if we get a very close |
| 302 | * match then report back the speed as a POSIX Bxxxx value by |
| 303 | * preference |
| 304 | */ |
| 305 | |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 306 | do { |
Maciej W. Rozycki | 75e8b71 | 2007-10-18 03:04:35 -0700 | [diff] [blame] | 307 | if (obaud - oclose <= baud_table[i] && |
| 308 | obaud + oclose >= baud_table[i]) { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 309 | termios->c_cflag |= baud_bits[i]; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 310 | ofound = i; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 311 | } |
Maciej W. Rozycki | 75e8b71 | 2007-10-18 03:04:35 -0700 | [diff] [blame] | 312 | if (ibaud - iclose <= baud_table[i] && |
| 313 | ibaud + iclose >= baud_table[i]) { |
| 314 | /* For the case input == output don't set IBAUD bits |
| 315 | if the user didn't do so */ |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 316 | if (ofound == i && !ibinput) |
| 317 | ifound = i; |
| 318 | #ifdef IBSHIFT |
| 319 | else { |
| 320 | ifound = i; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 321 | termios->c_cflag |= (baud_bits[i] << IBSHIFT); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 322 | } |
| 323 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 324 | } |
Jiri Slaby | 6804396 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 325 | } while (++i < n_baud_table); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 326 | |
| 327 | /* |
| 328 | * If we found no match then use BOTHER if provided or warn |
| 329 | * the user their platform maintainer needs to wake up if not. |
| 330 | */ |
| 331 | #ifdef BOTHER |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 332 | if (ofound == -1) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 333 | termios->c_cflag |= BOTHER; |
Alan Cox | 78137e3 | 2007-02-10 01:45:57 -0800 | [diff] [blame] | 334 | /* Set exact input bits only if the input and output differ or the |
| 335 | user already did */ |
Jiri Slaby | 6804396 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 336 | if (ifound == -1 && (ibaud != obaud || ibinput)) |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 337 | termios->c_cflag |= (BOTHER << IBSHIFT); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 338 | #else |
| 339 | if (ifound == -1 || ofound == -1) { |
| 340 | static int warned; |
| 341 | if (!warned++) |
| 342 | printk(KERN_WARNING "tty: Unable to return correct " |
| 343 | "speed data as your architecture needs updating.\n"); |
| 344 | } |
| 345 | #endif |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 346 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 347 | EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate); |
| 348 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 349 | void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud) |
| 350 | { |
| 351 | tty_termios_encode_baud_rate(tty->termios, ibaud, obaud); |
| 352 | } |
| 353 | EXPORT_SYMBOL_GPL(tty_encode_baud_rate); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 354 | |
| 355 | /** |
| 356 | * tty_get_baud_rate - get tty bit rates |
| 357 | * @tty: tty to query |
| 358 | * |
| 359 | * Returns the baud rate as an integer for this terminal. The |
| 360 | * termios lock must be held by the caller and the terminal bit |
| 361 | * flags may be updated. |
| 362 | * |
| 363 | * Locking: none |
| 364 | */ |
| 365 | |
| 366 | speed_t tty_get_baud_rate(struct tty_struct *tty) |
| 367 | { |
| 368 | speed_t baud = tty_termios_baud_rate(tty->termios); |
| 369 | |
| 370 | if (baud == 38400 && tty->alt_speed) { |
| 371 | if (!tty->warned) { |
| 372 | printk(KERN_WARNING "Use of setserial/setrocket to " |
| 373 | "set SPD_* flags is deprecated\n"); |
| 374 | tty->warned = 1; |
| 375 | } |
| 376 | baud = tty->alt_speed; |
| 377 | } |
| 378 | |
| 379 | return baud; |
| 380 | } |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 381 | EXPORT_SYMBOL(tty_get_baud_rate); |
| 382 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 383 | /** |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 384 | * tty_termios_copy_hw - copy hardware settings |
| 385 | * @new: New termios |
| 386 | * @old: Old termios |
| 387 | * |
| 388 | * Propogate the hardware specific terminal setting bits from |
| 389 | * the old termios structure to the new one. This is used in cases |
| 390 | * where the hardware does not support reconfiguration or as a helper |
| 391 | * in some cases where only minimal reconfiguration is supported |
| 392 | */ |
| 393 | |
| 394 | void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) |
| 395 | { |
| 396 | /* The bits a dumb device handles in software. Smart devices need |
| 397 | to always provide a set_termios method */ |
| 398 | new->c_cflag &= HUPCL | CREAD | CLOCAL; |
| 399 | new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); |
| 400 | new->c_ispeed = old->c_ispeed; |
| 401 | new->c_ospeed = old->c_ospeed; |
| 402 | } |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 403 | EXPORT_SYMBOL(tty_termios_copy_hw); |
| 404 | |
| 405 | /** |
Alan Cox | bf5e583 | 2008-01-08 14:55:51 +0000 | [diff] [blame] | 406 | * tty_termios_hw_change - check for setting change |
| 407 | * @a: termios |
| 408 | * @b: termios to compare |
| 409 | * |
| 410 | * Check if any of the bits that affect a dumb device have changed |
| 411 | * between the two termios structures, or a speed change is needed. |
| 412 | */ |
| 413 | |
| 414 | int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) |
| 415 | { |
| 416 | if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) |
| 417 | return 1; |
| 418 | if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) |
| 419 | return 1; |
| 420 | return 0; |
| 421 | } |
| 422 | EXPORT_SYMBOL(tty_termios_hw_change); |
| 423 | |
| 424 | /** |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 425 | * change_termios - update termios values |
| 426 | * @tty: tty to update |
| 427 | * @new_termios: desired new value |
| 428 | * |
| 429 | * Perform updates to the termios values set on this terminal. There |
| 430 | * is a bit of layering violation here with n_tty in terms of the |
| 431 | * internal knowledge of this function. |
| 432 | * |
| 433 | * Locking: termios_sem |
| 434 | */ |
| 435 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 436 | static void change_termios(struct tty_struct *tty, struct ktermios *new_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | { |
| 438 | int canon_change; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 439 | struct ktermios old_termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | struct tty_ldisc *ld; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 441 | unsigned long flags; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* |
| 444 | * Perform the actual termios internal changes under lock. |
| 445 | */ |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
| 448 | /* FIXME: we need to decide on some locking/ordering semantics |
| 449 | for the set_termios notification eventually */ |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 450 | mutex_lock(&tty->termios_mutex); |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 451 | old_termios = *tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | *tty->termios = *new_termios; |
| 453 | unset_locked_termios(tty->termios, &old_termios, tty->termios_locked); |
| 454 | canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON; |
| 455 | if (canon_change) { |
| 456 | memset(&tty->read_flags, 0, sizeof tty->read_flags); |
| 457 | tty->canon_head = tty->read_tail; |
| 458 | tty->canon_data = 0; |
| 459 | tty->erasing = 0; |
| 460 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 461 | |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 462 | /* This bit should be in the ldisc code */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (canon_change && !L_ICANON(tty) && tty->read_cnt) |
| 464 | /* Get characters left over from canonical mode. */ |
| 465 | wake_up_interruptible(&tty->read_wait); |
| 466 | |
| 467 | /* See if packet mode change of state. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | if (tty->link && tty->link->packet) { |
| 469 | int old_flow = ((old_termios.c_iflag & IXON) && |
| 470 | (old_termios.c_cc[VSTOP] == '\023') && |
| 471 | (old_termios.c_cc[VSTART] == '\021')); |
| 472 | int new_flow = (I_IXON(tty) && |
| 473 | STOP_CHAR(tty) == '\023' && |
| 474 | START_CHAR(tty) == '\021'); |
| 475 | if (old_flow != new_flow) { |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 476 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP); |
| 478 | if (new_flow) |
| 479 | tty->ctrl_status |= TIOCPKT_DOSTOP; |
| 480 | else |
| 481 | tty->ctrl_status |= TIOCPKT_NOSTOP; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 482 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | wake_up_interruptible(&tty->link->read_wait); |
| 484 | } |
| 485 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 486 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 487 | if (tty->ops->set_termios) |
| 488 | (*tty->ops->set_termios)(tty, &old_termios); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 489 | else |
| 490 | tty_termios_copy_hw(tty->termios, &old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | ld = tty_ldisc_ref(tty); |
| 493 | if (ld != NULL) { |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 494 | if (ld->ops->set_termios) |
| 495 | (ld->ops->set_termios)(tty, &old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | tty_ldisc_deref(ld); |
| 497 | } |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 498 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 501 | /** |
| 502 | * set_termios - set termios values for a tty |
| 503 | * @tty: terminal device |
| 504 | * @arg: user data |
| 505 | * @opt: option information |
| 506 | * |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 507 | * Helper function to prepare termios data and run necessary other |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 508 | * functions before using change_termios to do the actual changes. |
| 509 | * |
| 510 | * Locking: |
| 511 | * Called functions take ldisc and termios_sem locks |
| 512 | */ |
| 513 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 514 | static int set_termios(struct tty_struct *tty, void __user *arg, int opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 516 | struct ktermios tmp_termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | struct tty_ldisc *ld; |
| 518 | int retval = tty_check_change(tty); |
| 519 | |
| 520 | if (retval) |
| 521 | return retval; |
| 522 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 523 | mutex_lock(&tty->termios_mutex); |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 524 | memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios)); |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 525 | mutex_unlock(&tty->termios_mutex); |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | if (opt & TERMIOS_TERMIO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | if (user_termio_to_kernel_termios(&tmp_termios, |
| 529 | (struct termio __user *)arg)) |
| 530 | return -EFAULT; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 531 | #ifdef TCGETS2 |
| 532 | } else if (opt & TERMIOS_OLD) { |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 533 | if (user_termios_to_kernel_termios_1(&tmp_termios, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | (struct termios __user *)arg)) |
| 535 | return -EFAULT; |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 536 | } else { |
| 537 | if (user_termios_to_kernel_termios(&tmp_termios, |
| 538 | (struct termios2 __user *)arg)) |
| 539 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
Alan Cox | 64bb6c5 | 2006-12-08 02:38:47 -0800 | [diff] [blame] | 541 | #else |
| 542 | } else if (user_termios_to_kernel_termios(&tmp_termios, |
| 543 | (struct termios __user *)arg)) |
| 544 | return -EFAULT; |
| 545 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 547 | /* If old style Bfoo values are used then load c_ispeed/c_ospeed |
| 548 | * with the real speed so its unconditionally usable */ |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 549 | tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios); |
| 550 | tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios); |
| 551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | ld = tty_ldisc_ref(tty); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | if (ld != NULL) { |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 555 | if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) |
| 556 | ld->ops->flush_buffer(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | tty_ldisc_deref(ld); |
| 558 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | if (opt & TERMIOS_WAIT) { |
| 561 | tty_wait_until_sent(tty, 0); |
| 562 | if (signal_pending(current)) |
| 563 | return -EINTR; |
| 564 | } |
| 565 | |
| 566 | change_termios(tty, &tmp_termios); |
Alan Cox | 5f519d7 | 2007-10-16 23:30:07 -0700 | [diff] [blame] | 567 | |
| 568 | /* FIXME: Arguably if tmp_termios == tty->termios AND the |
| 569 | actual requested termios was not tmp_termios then we may |
| 570 | want to return an error as no user requested change has |
| 571 | succeeded */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | return 0; |
| 573 | } |
| 574 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 575 | static int get_termio(struct tty_struct *tty, struct termio __user *termio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | { |
| 577 | if (kernel_termios_to_user_termio(termio, tty->termios)) |
| 578 | return -EFAULT; |
| 579 | return 0; |
| 580 | } |
| 581 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 582 | static unsigned long inq_canon(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
| 584 | int nr, head, tail; |
| 585 | |
| 586 | if (!tty->canon_data || !tty->read_buf) |
| 587 | return 0; |
| 588 | head = tty->canon_head; |
| 589 | tail = tty->read_tail; |
| 590 | nr = (head - tail) & (N_TTY_BUF_SIZE-1); |
| 591 | /* Skip EOF-chars.. */ |
| 592 | while (head != tail) { |
| 593 | if (test_bit(tail, tty->read_flags) && |
| 594 | tty->read_buf[tail] == __DISABLED_CHAR) |
| 595 | nr--; |
| 596 | tail = (tail+1) & (N_TTY_BUF_SIZE-1); |
| 597 | } |
| 598 | return nr; |
| 599 | } |
| 600 | |
| 601 | #ifdef TIOCGETP |
| 602 | /* |
| 603 | * These are deprecated, but there is limited support.. |
| 604 | * |
| 605 | * The "sg_flags" translation is a joke.. |
| 606 | */ |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 607 | static int get_sgflags(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | { |
| 609 | int flags = 0; |
| 610 | |
| 611 | if (!(tty->termios->c_lflag & ICANON)) { |
| 612 | if (tty->termios->c_lflag & ISIG) |
| 613 | flags |= 0x02; /* cbreak */ |
| 614 | else |
| 615 | flags |= 0x20; /* raw */ |
| 616 | } |
| 617 | if (tty->termios->c_lflag & ECHO) |
| 618 | flags |= 0x08; /* echo */ |
| 619 | if (tty->termios->c_oflag & OPOST) |
| 620 | if (tty->termios->c_oflag & ONLCR) |
| 621 | flags |= 0x10; /* crmod */ |
| 622 | return flags; |
| 623 | } |
| 624 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 625 | static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | { |
| 627 | struct sgttyb tmp; |
| 628 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 629 | mutex_lock(&tty->termios_mutex); |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 630 | tmp.sg_ispeed = tty->termios->c_ispeed; |
| 631 | tmp.sg_ospeed = tty->termios->c_ospeed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | tmp.sg_erase = tty->termios->c_cc[VERASE]; |
| 633 | tmp.sg_kill = tty->termios->c_cc[VKILL]; |
| 634 | tmp.sg_flags = get_sgflags(tty); |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 635 | mutex_unlock(&tty->termios_mutex); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 638 | } |
| 639 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 640 | static void set_sgflags(struct ktermios *termios, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | { |
| 642 | termios->c_iflag = ICRNL | IXON; |
| 643 | termios->c_oflag = 0; |
| 644 | termios->c_lflag = ISIG | ICANON; |
| 645 | if (flags & 0x02) { /* cbreak */ |
| 646 | termios->c_iflag = 0; |
| 647 | termios->c_lflag &= ~ICANON; |
| 648 | } |
| 649 | if (flags & 0x08) { /* echo */ |
| 650 | termios->c_lflag |= ECHO | ECHOE | ECHOK | |
| 651 | ECHOCTL | ECHOKE | IEXTEN; |
| 652 | } |
| 653 | if (flags & 0x10) { /* crmod */ |
| 654 | termios->c_oflag |= OPOST | ONLCR; |
| 655 | } |
| 656 | if (flags & 0x20) { /* raw */ |
| 657 | termios->c_iflag = 0; |
| 658 | termios->c_lflag &= ~(ISIG | ICANON); |
| 659 | } |
| 660 | if (!(termios->c_lflag & ICANON)) { |
| 661 | termios->c_cc[VMIN] = 1; |
| 662 | termios->c_cc[VTIME] = 0; |
| 663 | } |
| 664 | } |
| 665 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 666 | /** |
| 667 | * set_sgttyb - set legacy terminal values |
| 668 | * @tty: tty structure |
| 669 | * @sgttyb: pointer to old style terminal structure |
| 670 | * |
| 671 | * Updates a terminal from the legacy BSD style terminal information |
| 672 | * structure. |
| 673 | * |
| 674 | * Locking: termios_sem |
| 675 | */ |
| 676 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 677 | static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | { |
| 679 | int retval; |
| 680 | struct sgttyb tmp; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 681 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | retval = tty_check_change(tty); |
| 684 | if (retval) |
| 685 | return retval; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) |
| 688 | return -EFAULT; |
| 689 | |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 690 | mutex_lock(&tty->termios_mutex); |
Jiri Slaby | 6804396 | 2007-07-15 23:40:18 -0700 | [diff] [blame] | 691 | termios = *tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | termios.c_cc[VERASE] = tmp.sg_erase; |
| 693 | termios.c_cc[VKILL] = tmp.sg_kill; |
| 694 | set_sgflags(&termios, tmp.sg_flags); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 695 | /* Try and encode into Bfoo format */ |
| 696 | #ifdef BOTHER |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 697 | tty_termios_encode_baud_rate(&termios, termios.c_ispeed, |
| 698 | termios.c_ospeed); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 699 | #endif |
Arjan van de Ven | 5785c95 | 2006-09-29 02:00:43 -0700 | [diff] [blame] | 700 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | change_termios(tty, &termios); |
| 702 | return 0; |
| 703 | } |
| 704 | #endif |
| 705 | |
| 706 | #ifdef TIOCGETC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 707 | static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
| 709 | struct tchars tmp; |
| 710 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 711 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | tmp.t_intrc = tty->termios->c_cc[VINTR]; |
| 713 | tmp.t_quitc = tty->termios->c_cc[VQUIT]; |
| 714 | tmp.t_startc = tty->termios->c_cc[VSTART]; |
| 715 | tmp.t_stopc = tty->termios->c_cc[VSTOP]; |
| 716 | tmp.t_eofc = tty->termios->c_cc[VEOF]; |
| 717 | tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */ |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 718 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 720 | } |
| 721 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 722 | static int set_tchars(struct tty_struct *tty, struct tchars __user *tchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | { |
| 724 | struct tchars tmp; |
| 725 | |
| 726 | if (copy_from_user(&tmp, tchars, sizeof(tmp))) |
| 727 | return -EFAULT; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 728 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | tty->termios->c_cc[VINTR] = tmp.t_intrc; |
| 730 | tty->termios->c_cc[VQUIT] = tmp.t_quitc; |
| 731 | tty->termios->c_cc[VSTART] = tmp.t_startc; |
| 732 | tty->termios->c_cc[VSTOP] = tmp.t_stopc; |
| 733 | tty->termios->c_cc[VEOF] = tmp.t_eofc; |
| 734 | tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */ |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 735 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | return 0; |
| 737 | } |
| 738 | #endif |
| 739 | |
| 740 | #ifdef TIOCGLTC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 741 | static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | { |
| 743 | struct ltchars tmp; |
| 744 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 745 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | tmp.t_suspc = tty->termios->c_cc[VSUSP]; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 747 | /* what is dsuspc anyway? */ |
| 748 | tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | tmp.t_rprntc = tty->termios->c_cc[VREPRINT]; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 750 | /* what is flushc anyway? */ |
| 751 | tmp.t_flushc = tty->termios->c_cc[VEOL2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | tmp.t_werasc = tty->termios->c_cc[VWERASE]; |
| 753 | tmp.t_lnextc = tty->termios->c_cc[VLNEXT]; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 754 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; |
| 756 | } |
| 757 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 758 | static int set_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | { |
| 760 | struct ltchars tmp; |
| 761 | |
| 762 | if (copy_from_user(&tmp, ltchars, sizeof(tmp))) |
| 763 | return -EFAULT; |
| 764 | |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 765 | mutex_lock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | tty->termios->c_cc[VSUSP] = tmp.t_suspc; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 767 | /* what is dsuspc anyway? */ |
| 768 | tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | tty->termios->c_cc[VREPRINT] = tmp.t_rprntc; |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 770 | /* what is flushc anyway? */ |
| 771 | tty->termios->c_cc[VEOL2] = tmp.t_flushc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | tty->termios->c_cc[VWERASE] = tmp.t_werasc; |
| 773 | tty->termios->c_cc[VLNEXT] = tmp.t_lnextc; |
Alan Cox | 978e595 | 2008-04-30 00:53:59 -0700 | [diff] [blame] | 774 | mutex_unlock(&tty->termios_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | return 0; |
| 776 | } |
| 777 | #endif |
| 778 | |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 779 | /** |
| 780 | * send_prio_char - send priority character |
| 781 | * |
| 782 | * Send a high priority character to the tty even if stopped |
| 783 | * |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 784 | * Locking: none for xchar method, write ordering for write method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | */ |
Alan Cox | af9b897 | 2006-08-27 01:24:01 -0700 | [diff] [blame] | 786 | |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 787 | static int send_prio_char(struct tty_struct *tty, char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | { |
| 789 | int was_stopped = tty->stopped; |
| 790 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 791 | if (tty->ops->send_xchar) { |
| 792 | tty->ops->send_xchar(tty, ch); |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 793 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 795 | |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 796 | if (tty_write_lock(tty, 0) < 0) |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 797 | return -ERESTARTSYS; |
| 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | if (was_stopped) |
| 800 | start_tty(tty); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 801 | tty->ops->write(tty, &ch, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | if (was_stopped) |
| 803 | stop_tty(tty); |
Alan Cox | 9c1729d | 2007-07-15 23:39:43 -0700 | [diff] [blame] | 804 | tty_write_unlock(tty); |
Alan Cox | 5f412b2 | 2006-09-29 02:01:40 -0700 | [diff] [blame] | 805 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 808 | /** |
Alan Cox | 1c2630c | 2008-04-30 00:53:34 -0700 | [diff] [blame] | 809 | * tty_change_softcar - carrier change ioctl helper |
| 810 | * @tty: tty to update |
| 811 | * @arg: enable/disable CLOCAL |
| 812 | * |
| 813 | * Perform a change to the CLOCAL state and call into the driver |
| 814 | * layer to make it visible. All done with the termios mutex |
| 815 | */ |
| 816 | |
| 817 | static int tty_change_softcar(struct tty_struct *tty, int arg) |
| 818 | { |
| 819 | int ret = 0; |
| 820 | int bit = arg ? CLOCAL : 0; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 821 | struct ktermios old; |
Alan Cox | 1c2630c | 2008-04-30 00:53:34 -0700 | [diff] [blame] | 822 | |
| 823 | mutex_lock(&tty->termios_mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 824 | old = *tty->termios; |
Alan Cox | 1c2630c | 2008-04-30 00:53:34 -0700 | [diff] [blame] | 825 | tty->termios->c_cflag &= ~CLOCAL; |
| 826 | tty->termios->c_cflag |= bit; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 827 | if (tty->ops->set_termios) |
| 828 | tty->ops->set_termios(tty, &old); |
Alan Cox | 1c2630c | 2008-04-30 00:53:34 -0700 | [diff] [blame] | 829 | if ((tty->termios->c_cflag & CLOCAL) != bit) |
| 830 | ret = -EINVAL; |
| 831 | mutex_unlock(&tty->termios_mutex); |
| 832 | return ret; |
| 833 | } |
| 834 | |
| 835 | /** |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 836 | * tty_mode_ioctl - mode related ioctls |
| 837 | * @tty: tty for the ioctl |
| 838 | * @file: file pointer for the tty |
| 839 | * @cmd: command |
| 840 | * @arg: ioctl argument |
| 841 | * |
| 842 | * Perform non line discipline specific mode control ioctls. This |
| 843 | * is designed to be called by line disciplines to ensure they provide |
| 844 | * consistent mode setting. |
| 845 | */ |
| 846 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 847 | int tty_mode_ioctl(struct tty_struct *tty, struct file *file, |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 848 | unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | { |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 850 | struct tty_struct *real_tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | void __user *p = (void __user *)arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
| 853 | if (tty->driver->type == TTY_DRIVER_TYPE_PTY && |
| 854 | tty->driver->subtype == PTY_TYPE_MASTER) |
| 855 | real_tty = tty->link; |
| 856 | else |
| 857 | real_tty = tty; |
| 858 | |
| 859 | switch (cmd) { |
| 860 | #ifdef TIOCGETP |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 861 | case TIOCGETP: |
| 862 | return get_sgttyb(real_tty, (struct sgttyb __user *) arg); |
| 863 | case TIOCSETP: |
| 864 | case TIOCSETN: |
| 865 | return set_sgttyb(real_tty, (struct sgttyb __user *) arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | #endif |
| 867 | #ifdef TIOCGETC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 868 | case TIOCGETC: |
| 869 | return get_tchars(real_tty, p); |
| 870 | case TIOCSETC: |
| 871 | return set_tchars(real_tty, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | #endif |
| 873 | #ifdef TIOCGLTC |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 874 | case TIOCGLTC: |
| 875 | return get_ltchars(real_tty, p); |
| 876 | case TIOCSLTC: |
| 877 | return set_ltchars(real_tty, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | #endif |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 879 | case TCSETSF: |
| 880 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD); |
| 881 | case TCSETSW: |
| 882 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD); |
| 883 | case TCSETS: |
| 884 | return set_termios(real_tty, p, TERMIOS_OLD); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 885 | #ifndef TCGETS2 |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 886 | case TCGETS: |
| 887 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) |
| 888 | return -EFAULT; |
| 889 | return 0; |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 890 | #else |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 891 | case TCGETS: |
| 892 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios)) |
| 893 | return -EFAULT; |
| 894 | return 0; |
| 895 | case TCGETS2: |
| 896 | if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios)) |
| 897 | return -EFAULT; |
| 898 | return 0; |
| 899 | case TCSETSF2: |
| 900 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); |
| 901 | case TCSETSW2: |
| 902 | return set_termios(real_tty, p, TERMIOS_WAIT); |
| 903 | case TCSETS2: |
| 904 | return set_termios(real_tty, p, 0); |
Alan Cox | edc6afc | 2006-12-08 02:38:44 -0800 | [diff] [blame] | 905 | #endif |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 906 | case TCGETA: |
| 907 | return get_termio(real_tty, p); |
| 908 | case TCSETAF: |
| 909 | return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO); |
| 910 | case TCSETAW: |
| 911 | return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO); |
| 912 | case TCSETA: |
| 913 | return set_termios(real_tty, p, TERMIOS_TERMIO); |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 914 | #ifndef TCGETS2 |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 915 | case TIOCGLCKTRMIOS: |
| 916 | if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked)) |
| 917 | return -EFAULT; |
| 918 | return 0; |
| 919 | case TIOCSLCKTRMIOS: |
| 920 | if (!capable(CAP_SYS_ADMIN)) |
| 921 | return -EPERM; |
| 922 | if (user_termios_to_kernel_termios(real_tty->termios_locked, |
| 923 | (struct termios __user *) arg)) |
| 924 | return -EFAULT; |
| 925 | return 0; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 926 | #else |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 927 | case TIOCGLCKTRMIOS: |
| 928 | if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked)) |
| 929 | return -EFAULT; |
| 930 | return 0; |
| 931 | case TIOCSLCKTRMIOS: |
| 932 | if (!capable(CAP_SYS_ADMIN)) |
| 933 | return -EPERM; |
| 934 | if (user_termios_to_kernel_termios_1(real_tty->termios_locked, |
| 935 | (struct termios __user *) arg)) |
| 936 | return -EFAULT; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 937 | return 0; |
| 938 | #endif |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 939 | case TIOCGSOFTCAR: |
Alan Cox | f753f32 | 2008-08-26 19:52:47 +0100 | [diff] [blame] | 940 | /* FIXME: for correctness we may need to take the termios |
| 941 | lock here - review */ |
| 942 | return put_user(C_CLOCAL(real_tty) ? 1 : 0, |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 943 | (int __user *)arg); |
| 944 | case TIOCSSOFTCAR: |
| 945 | if (get_user(arg, (unsigned int __user *) arg)) |
| 946 | return -EFAULT; |
Alan Cox | f753f32 | 2008-08-26 19:52:47 +0100 | [diff] [blame] | 947 | return tty_change_softcar(real_tty, arg); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 948 | default: |
| 949 | return -ENOIOCTLCMD; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 950 | } |
| 951 | } |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 952 | EXPORT_SYMBOL_GPL(tty_mode_ioctl); |
| 953 | |
| 954 | int tty_perform_flush(struct tty_struct *tty, unsigned long arg) |
| 955 | { |
| 956 | struct tty_ldisc *ld; |
| 957 | int retval = tty_check_change(tty); |
| 958 | if (retval) |
| 959 | return retval; |
| 960 | |
| 961 | ld = tty_ldisc_ref(tty); |
| 962 | switch (arg) { |
| 963 | case TCIFLUSH: |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 964 | if (ld && ld->ops->flush_buffer) |
| 965 | ld->ops->flush_buffer(tty); |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 966 | break; |
| 967 | case TCIOFLUSH: |
Alan Cox | a352def | 2008-07-16 21:53:12 +0100 | [diff] [blame] | 968 | if (ld && ld->ops->flush_buffer) |
| 969 | ld->ops->flush_buffer(tty); |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 970 | /* fall through */ |
| 971 | case TCOFLUSH: |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 972 | tty_driver_flush_buffer(tty); |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 973 | break; |
| 974 | default: |
| 975 | tty_ldisc_deref(ld); |
| 976 | return -EINVAL; |
| 977 | } |
| 978 | tty_ldisc_deref(ld); |
| 979 | return 0; |
| 980 | } |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 981 | EXPORT_SYMBOL_GPL(tty_perform_flush); |
| 982 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 983 | int n_tty_ioctl(struct tty_struct *tty, struct file *file, |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 984 | unsigned int cmd, unsigned long arg) |
| 985 | { |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 986 | unsigned long flags; |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 987 | int retval; |
| 988 | |
Alan Cox | 0fc00e2 | 2007-11-07 01:24:56 -0800 | [diff] [blame] | 989 | switch (cmd) { |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 990 | case TCXONC: |
| 991 | retval = tty_check_change(tty); |
| 992 | if (retval) |
| 993 | return retval; |
| 994 | switch (arg) { |
| 995 | case TCOOFF: |
| 996 | if (!tty->flow_stopped) { |
| 997 | tty->flow_stopped = 1; |
| 998 | stop_tty(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1000 | break; |
| 1001 | case TCOON: |
| 1002 | if (tty->flow_stopped) { |
| 1003 | tty->flow_stopped = 0; |
| 1004 | start_tty(tty); |
| 1005 | } |
| 1006 | break; |
| 1007 | case TCIOFF: |
| 1008 | if (STOP_CHAR(tty) != __DISABLED_CHAR) |
| 1009 | return send_prio_char(tty, STOP_CHAR(tty)); |
| 1010 | break; |
| 1011 | case TCION: |
| 1012 | if (START_CHAR(tty) != __DISABLED_CHAR) |
| 1013 | return send_prio_char(tty, START_CHAR(tty)); |
| 1014 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | default: |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1016 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | } |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1018 | return 0; |
| 1019 | case TCFLSH: |
| 1020 | return tty_perform_flush(tty, arg); |
| 1021 | case TIOCOUTQ: |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1022 | return put_user(tty_chars_in_buffer(tty), (int __user *) arg); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1023 | case TIOCINQ: |
| 1024 | retval = tty->read_cnt; |
| 1025 | if (L_ICANON(tty)) |
| 1026 | retval = inq_canon(tty); |
| 1027 | return put_user(retval, (unsigned int __user *) arg); |
| 1028 | case TIOCPKT: |
| 1029 | { |
| 1030 | int pktmode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1032 | if (tty->driver->type != TTY_DRIVER_TYPE_PTY || |
| 1033 | tty->driver->subtype != PTY_TYPE_MASTER) |
| 1034 | return -ENOTTY; |
| 1035 | if (get_user(pktmode, (int __user *) arg)) |
| 1036 | return -EFAULT; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 1037 | spin_lock_irqsave(&tty->ctrl_lock, flags); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1038 | if (pktmode) { |
| 1039 | if (!tty->packet) { |
| 1040 | tty->packet = 1; |
| 1041 | tty->link->ctrl_status = 0; |
| 1042 | } |
| 1043 | } else |
| 1044 | tty->packet = 0; |
Alan Cox | 04f378b | 2008-04-30 00:53:29 -0700 | [diff] [blame] | 1045 | spin_unlock_irqrestore(&tty->ctrl_lock, flags); |
Alan Cox | 355d95a | 2008-02-08 04:18:48 -0800 | [diff] [blame] | 1046 | return 0; |
| 1047 | } |
| 1048 | default: |
| 1049 | /* Try the mode commands */ |
| 1050 | return tty_mode_ioctl(tty, file, cmd, arg); |
| 1051 | } |
| 1052 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | EXPORT_SYMBOL(n_tty_ioctl); |