ARM: S3C24XX: serial: Fix section mismatch warnings
[linux-2.6] / drivers / char / pty.c
1 /*
2  *  linux/drivers/char/pty.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  *
6  *  Added support for a Unix98-style ptmx device.
7  *    -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
8  *
9  *  When reading this code see also fs/devpts. In particular note that the
10  *  driver_data field is used by the devpts side as a binding to the devpts
11  *  inode.
12  */
13
14 #include <linux/module.h>
15
16 #include <linux/errno.h>
17 #include <linux/interrupt.h>
18 #include <linux/tty.h>
19 #include <linux/tty_flip.h>
20 #include <linux/fcntl.h>
21 #include <linux/string.h>
22 #include <linux/major.h>
23 #include <linux/mm.h>
24 #include <linux/init.h>
25 #include <linux/smp_lock.h>
26 #include <linux/sysctl.h>
27 #include <linux/device.h>
28 #include <linux/uaccess.h>
29 #include <linux/bitops.h>
30 #include <linux/devpts_fs.h>
31
32 #include <asm/system.h>
33
34 #ifdef CONFIG_UNIX98_PTYS
35 static struct tty_driver *ptm_driver;
36 static struct tty_driver *pts_driver;
37 #endif
38
39 static void pty_close(struct tty_struct *tty, struct file *filp)
40 {
41         BUG_ON(!tty);
42         if (tty->driver->subtype == PTY_TYPE_MASTER)
43                 WARN_ON(tty->count > 1);
44         else {
45                 if (tty->count > 2)
46                         return;
47         }
48         wake_up_interruptible(&tty->read_wait);
49         wake_up_interruptible(&tty->write_wait);
50         tty->packet = 0;
51         if (!tty->link)
52                 return;
53         tty->link->packet = 0;
54         set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
55         wake_up_interruptible(&tty->link->read_wait);
56         wake_up_interruptible(&tty->link->write_wait);
57         if (tty->driver->subtype == PTY_TYPE_MASTER) {
58                 set_bit(TTY_OTHER_CLOSED, &tty->flags);
59 #ifdef CONFIG_UNIX98_PTYS
60                 if (tty->driver == ptm_driver)
61                         devpts_pty_kill(tty->link);
62 #endif
63                 tty_vhangup(tty->link);
64         }
65 }
66
67 /*
68  * The unthrottle routine is called by the line discipline to signal
69  * that it can receive more characters.  For PTY's, the TTY_THROTTLED
70  * flag is always set, to force the line discipline to always call the
71  * unthrottle routine when there are fewer than TTY_THRESHOLD_UNTHROTTLE
72  * characters in the queue.  This is necessary since each time this
73  * happens, we need to wake up any sleeping processes that could be
74  * (1) trying to send data to the pty, or (2) waiting in wait_until_sent()
75  * for the pty buffer to be drained.
76  */
77 static void pty_unthrottle(struct tty_struct *tty)
78 {
79         tty_wakeup(tty->link);
80         set_bit(TTY_THROTTLED, &tty->flags);
81 }
82
83 /**
84  *      pty_space       -       report space left for writing
85  *      @to: tty we are writing into
86  *
87  *      The tty buffers allow 64K but we sneak a peak and clip at 8K this
88  *      allows a lot of overspill room for echo and other fun messes to
89  *      be handled properly
90  */
91
92 static int pty_space(struct tty_struct *to)
93 {
94         int n = 8192 - to->buf.memory_used;
95         if (n < 0)
96                 return 0;
97         return n;
98 }
99
100 /**
101  *      pty_write               -       write to a pty
102  *      @tty: the tty we write from
103  *      @buf: kernel buffer of data
104  *      @count: bytes to write
105  *
106  *      Our "hardware" write method. Data is coming from the ldisc which
107  *      may be in a non sleeping state. We simply throw this at the other
108  *      end of the link as if we were an IRQ handler receiving stuff for
109  *      the other side of the pty/tty pair.
110  */
111
112 static int pty_write(struct tty_struct *tty, const unsigned char *buf,
113                                                                 int count)
114 {
115         struct tty_struct *to = tty->link;
116         int c;
117
118         if (tty->stopped)
119                 return 0;
120
121         /* This isn't locked but our 8K is quite sloppy so no
122            big deal */
123
124         c = pty_space(to);
125         if (c > count)
126                 c = count;
127         if (c > 0) {
128                 /* Stuff the data into the input queue of the other end */
129                 c = tty_insert_flip_string(to, buf, c);
130                 /* And shovel */
131                 tty_flip_buffer_push(to);
132                 tty_wakeup(tty);
133         }
134         return c;
135 }
136
137 /**
138  *      pty_write_room  -       write space
139  *      @tty: tty we are writing from
140  *
141  *      Report how many bytes the ldisc can send into the queue for
142  *      the other device.
143  */
144
145 static int pty_write_room(struct tty_struct *tty)
146 {
147         return pty_space(tty->link);
148 }
149
150 /**
151  *      pty_chars_in_buffer     -       characters currently in our tx queue
152  *      @tty: our tty
153  *
154  *      Report how much we have in the transmit queue. As everything is
155  *      instantly at the other end this is easy to implement.
156  */
157
158 static int pty_chars_in_buffer(struct tty_struct *tty)
159 {
160         return 0;
161 }
162
163 /* Set the lock flag on a pty */
164 static int pty_set_lock(struct tty_struct *tty, int __user *arg)
165 {
166         int val;
167         if (get_user(val, arg))
168                 return -EFAULT;
169         if (val)
170                 set_bit(TTY_PTY_LOCK, &tty->flags);
171         else
172                 clear_bit(TTY_PTY_LOCK, &tty->flags);
173         return 0;
174 }
175
176 static void pty_flush_buffer(struct tty_struct *tty)
177 {
178         struct tty_struct *to = tty->link;
179         unsigned long flags;
180
181         if (!to)
182                 return;
183         /* tty_buffer_flush(to); FIXME */
184         if (to->packet) {
185                 spin_lock_irqsave(&tty->ctrl_lock, flags);
186                 tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
187                 wake_up_interruptible(&to->read_wait);
188                 spin_unlock_irqrestore(&tty->ctrl_lock, flags);
189         }
190 }
191
192 static int pty_open(struct tty_struct *tty, struct file *filp)
193 {
194         int     retval = -ENODEV;
195
196         if (!tty || !tty->link)
197                 goto out;
198
199         retval = -EIO;
200         if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
201                 goto out;
202         if (test_bit(TTY_PTY_LOCK, &tty->link->flags))
203                 goto out;
204         if (tty->link->count != 1)
205                 goto out;
206
207         clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
208         set_bit(TTY_THROTTLED, &tty->flags);
209         retval = 0;
210 out:
211         return retval;
212 }
213
214 static void pty_set_termios(struct tty_struct *tty,
215                                         struct ktermios *old_termios)
216 {
217         tty->termios->c_cflag &= ~(CSIZE | PARENB);
218         tty->termios->c_cflag |= (CS8 | CREAD);
219 }
220
221 /**
222  *      pty_do_resize           -       resize event
223  *      @tty: tty being resized
224  *      @ws: window size being set.
225  *
226  *      Update the termios variables and send the neccessary signals to
227  *      peform a terminal resize correctly
228  */
229
230 int pty_resize(struct tty_struct *tty,  struct winsize *ws)
231 {
232         struct pid *pgrp, *rpgrp;
233         unsigned long flags;
234         struct tty_struct *pty = tty->link;
235
236         /* For a PTY we need to lock the tty side */
237         mutex_lock(&tty->termios_mutex);
238         if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
239                 goto done;
240
241         /* Get the PID values and reference them so we can
242            avoid holding the tty ctrl lock while sending signals.
243            We need to lock these individually however. */
244
245         spin_lock_irqsave(&tty->ctrl_lock, flags);
246         pgrp = get_pid(tty->pgrp);
247         spin_unlock_irqrestore(&tty->ctrl_lock, flags);
248
249         spin_lock_irqsave(&pty->ctrl_lock, flags);
250         rpgrp = get_pid(pty->pgrp);
251         spin_unlock_irqrestore(&pty->ctrl_lock, flags);
252
253         if (pgrp)
254                 kill_pgrp(pgrp, SIGWINCH, 1);
255         if (rpgrp != pgrp && rpgrp)
256                 kill_pgrp(rpgrp, SIGWINCH, 1);
257
258         put_pid(pgrp);
259         put_pid(rpgrp);
260
261         tty->winsize = *ws;
262         pty->winsize = *ws;     /* Never used so will go away soon */
263 done:
264         mutex_unlock(&tty->termios_mutex);
265         return 0;
266 }
267
268 static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
269 {
270         struct tty_struct *o_tty;
271         int idx = tty->index;
272         int retval;
273
274         o_tty = alloc_tty_struct();
275         if (!o_tty)
276                 return -ENOMEM;
277         if (!try_module_get(driver->other->owner)) {
278                 /* This cannot in fact currently happen */
279                 free_tty_struct(o_tty);
280                 return -ENOMEM;
281         }
282         initialize_tty_struct(o_tty, driver->other, idx);
283
284         /* We always use new tty termios data so we can do this
285            the easy way .. */
286         retval = tty_init_termios(tty);
287         if (retval)
288                 goto free_mem_out;
289
290         retval = tty_init_termios(o_tty);
291         if (retval) {
292                 tty_free_termios(tty);
293                 goto free_mem_out;
294         }
295
296         /*
297          * Everything allocated ... set up the o_tty structure.
298          */
299         driver->other->ttys[idx] = o_tty;
300         tty_driver_kref_get(driver->other);
301         if (driver->subtype == PTY_TYPE_MASTER)
302                 o_tty->count++;
303         /* Establish the links in both directions */
304         tty->link   = o_tty;
305         o_tty->link = tty;
306
307         tty_driver_kref_get(driver);
308         tty->count++;
309         driver->ttys[idx] = tty;
310         return 0;
311 free_mem_out:
312         module_put(o_tty->driver->owner);
313         free_tty_struct(o_tty);
314         return -ENOMEM;
315 }
316
317
318 static const struct tty_operations pty_ops = {
319         .install = pty_install,
320         .open = pty_open,
321         .close = pty_close,
322         .write = pty_write,
323         .write_room = pty_write_room,
324         .flush_buffer = pty_flush_buffer,
325         .chars_in_buffer = pty_chars_in_buffer,
326         .unthrottle = pty_unthrottle,
327         .set_termios = pty_set_termios,
328         .resize = pty_resize
329 };
330
331 /* Traditional BSD devices */
332 #ifdef CONFIG_LEGACY_PTYS
333 static struct tty_driver *pty_driver, *pty_slave_driver;
334
335 static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
336                          unsigned int cmd, unsigned long arg)
337 {
338         switch (cmd) {
339         case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
340                 return pty_set_lock(tty, (int __user *) arg);
341         }
342         return -ENOIOCTLCMD;
343 }
344
345 static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
346 module_param(legacy_count, int, 0);
347
348 static const struct tty_operations pty_ops_bsd = {
349         .open = pty_open,
350         .close = pty_close,
351         .write = pty_write,
352         .write_room = pty_write_room,
353         .flush_buffer = pty_flush_buffer,
354         .chars_in_buffer = pty_chars_in_buffer,
355         .unthrottle = pty_unthrottle,
356         .set_termios = pty_set_termios,
357         .ioctl = pty_bsd_ioctl,
358         .resize = pty_resize
359 };
360
361 static void __init legacy_pty_init(void)
362 {
363         if (legacy_count <= 0)
364                 return;
365
366         pty_driver = alloc_tty_driver(legacy_count);
367         if (!pty_driver)
368                 panic("Couldn't allocate pty driver");
369
370         pty_slave_driver = alloc_tty_driver(legacy_count);
371         if (!pty_slave_driver)
372                 panic("Couldn't allocate pty slave driver");
373
374         pty_driver->owner = THIS_MODULE;
375         pty_driver->driver_name = "pty_master";
376         pty_driver->name = "pty";
377         pty_driver->major = PTY_MASTER_MAJOR;
378         pty_driver->minor_start = 0;
379         pty_driver->type = TTY_DRIVER_TYPE_PTY;
380         pty_driver->subtype = PTY_TYPE_MASTER;
381         pty_driver->init_termios = tty_std_termios;
382         pty_driver->init_termios.c_iflag = 0;
383         pty_driver->init_termios.c_oflag = 0;
384         pty_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
385         pty_driver->init_termios.c_lflag = 0;
386         pty_driver->init_termios.c_ispeed = 38400;
387         pty_driver->init_termios.c_ospeed = 38400;
388         pty_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW;
389         pty_driver->other = pty_slave_driver;
390         tty_set_operations(pty_driver, &pty_ops);
391
392         pty_slave_driver->owner = THIS_MODULE;
393         pty_slave_driver->driver_name = "pty_slave";
394         pty_slave_driver->name = "ttyp";
395         pty_slave_driver->major = PTY_SLAVE_MAJOR;
396         pty_slave_driver->minor_start = 0;
397         pty_slave_driver->type = TTY_DRIVER_TYPE_PTY;
398         pty_slave_driver->subtype = PTY_TYPE_SLAVE;
399         pty_slave_driver->init_termios = tty_std_termios;
400         pty_slave_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
401         pty_slave_driver->init_termios.c_ispeed = 38400;
402         pty_slave_driver->init_termios.c_ospeed = 38400;
403         pty_slave_driver->flags = TTY_DRIVER_RESET_TERMIOS |
404                                         TTY_DRIVER_REAL_RAW;
405         pty_slave_driver->other = pty_driver;
406         tty_set_operations(pty_slave_driver, &pty_ops);
407
408         if (tty_register_driver(pty_driver))
409                 panic("Couldn't register pty driver");
410         if (tty_register_driver(pty_slave_driver))
411                 panic("Couldn't register pty slave driver");
412 }
413 #else
414 static inline void legacy_pty_init(void) { }
415 #endif
416
417 /* Unix98 devices */
418 #ifdef CONFIG_UNIX98_PTYS
419 /*
420  * sysctl support for setting limits on the number of Unix98 ptys allocated.
421  * Otherwise one can eat up all kernel memory by opening /dev/ptmx repeatedly.
422  */
423 int pty_limit = NR_UNIX98_PTY_DEFAULT;
424 static int pty_limit_min;
425 static int pty_limit_max = NR_UNIX98_PTY_MAX;
426 static int pty_count;
427
428 static struct cdev ptmx_cdev;
429
430 static struct ctl_table pty_table[] = {
431         {
432                 .ctl_name       = PTY_MAX,
433                 .procname       = "max",
434                 .maxlen         = sizeof(int),
435                 .mode           = 0644,
436                 .data           = &pty_limit,
437                 .proc_handler   = &proc_dointvec_minmax,
438                 .strategy       = &sysctl_intvec,
439                 .extra1         = &pty_limit_min,
440                 .extra2         = &pty_limit_max,
441         }, {
442                 .ctl_name       = PTY_NR,
443                 .procname       = "nr",
444                 .maxlen         = sizeof(int),
445                 .mode           = 0444,
446                 .data           = &pty_count,
447                 .proc_handler   = &proc_dointvec,
448         }, {
449                 .ctl_name       = 0
450         }
451 };
452
453 static struct ctl_table pty_kern_table[] = {
454         {
455                 .ctl_name       = KERN_PTY,
456                 .procname       = "pty",
457                 .mode           = 0555,
458                 .child          = pty_table,
459         },
460         {}
461 };
462
463 static struct ctl_table pty_root_table[] = {
464         {
465                 .ctl_name       = CTL_KERN,
466                 .procname       = "kernel",
467                 .mode           = 0555,
468                 .child          = pty_kern_table,
469         },
470         {}
471 };
472
473
474 static int pty_unix98_ioctl(struct tty_struct *tty, struct file *file,
475                             unsigned int cmd, unsigned long arg)
476 {
477         switch (cmd) {
478         case TIOCSPTLCK: /* Set PT Lock (disallow slave open) */
479                 return pty_set_lock(tty, (int __user *)arg);
480         case TIOCGPTN: /* Get PT Number */
481                 return put_user(tty->index, (unsigned int __user *)arg);
482         }
483
484         return -ENOIOCTLCMD;
485 }
486
487 /**
488  *      ptm_unix98_lookup       -       find a pty master
489  *      @driver: ptm driver
490  *      @idx: tty index
491  *
492  *      Look up a pty master device. Called under the tty_mutex for now.
493  *      This provides our locking.
494  */
495
496 static struct tty_struct *ptm_unix98_lookup(struct tty_driver *driver,
497                 struct inode *ptm_inode, int idx)
498 {
499         struct tty_struct *tty = devpts_get_tty(ptm_inode, idx);
500         if (tty)
501                 tty = tty->link;
502         return tty;
503 }
504
505 /**
506  *      pts_unix98_lookup       -       find a pty slave
507  *      @driver: pts driver
508  *      @idx: tty index
509  *
510  *      Look up a pty master device. Called under the tty_mutex for now.
511  *      This provides our locking.
512  */
513
514 static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
515                 struct inode *pts_inode, int idx)
516 {
517         struct tty_struct *tty = devpts_get_tty(pts_inode, idx);
518         /* Master must be open before slave */
519         if (!tty)
520                 return ERR_PTR(-EIO);
521         return tty;
522 }
523
524 static void pty_unix98_shutdown(struct tty_struct *tty)
525 {
526         /* We have our own method as we don't use the tty index */
527         kfree(tty->termios);
528 }
529
530 /* We have no need to install and remove our tty objects as devpts does all
531    the work for us */
532
533 static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
534 {
535         struct tty_struct *o_tty;
536         int idx = tty->index;
537
538         o_tty = alloc_tty_struct();
539         if (!o_tty)
540                 return -ENOMEM;
541         if (!try_module_get(driver->other->owner)) {
542                 /* This cannot in fact currently happen */
543                 free_tty_struct(o_tty);
544                 return -ENOMEM;
545         }
546         initialize_tty_struct(o_tty, driver->other, idx);
547
548         tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
549         if (tty->termios == NULL)
550                 goto free_mem_out;
551         *tty->termios = driver->init_termios;
552         tty->termios_locked = tty->termios + 1;
553
554         o_tty->termios = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
555         if (o_tty->termios == NULL)
556                 goto free_mem_out;
557         *o_tty->termios = driver->other->init_termios;
558         o_tty->termios_locked = o_tty->termios + 1;
559
560         tty_driver_kref_get(driver->other);
561         if (driver->subtype == PTY_TYPE_MASTER)
562                 o_tty->count++;
563         /* Establish the links in both directions */
564         tty->link   = o_tty;
565         o_tty->link = tty;
566         /*
567          * All structures have been allocated, so now we install them.
568          * Failures after this point use release_tty to clean up, so
569          * there's no need to null out the local pointers.
570          */
571         tty_driver_kref_get(driver);
572         tty->count++;
573         pty_count++;
574         return 0;
575 free_mem_out:
576         kfree(o_tty->termios);
577         module_put(o_tty->driver->owner);
578         free_tty_struct(o_tty);
579         kfree(tty->termios);
580         return -ENOMEM;
581 }
582
583 static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
584 {
585         pty_count--;
586 }
587
588 static const struct tty_operations ptm_unix98_ops = {
589         .lookup = ptm_unix98_lookup,
590         .install = pty_unix98_install,
591         .remove = pty_unix98_remove,
592         .open = pty_open,
593         .close = pty_close,
594         .write = pty_write,
595         .write_room = pty_write_room,
596         .flush_buffer = pty_flush_buffer,
597         .chars_in_buffer = pty_chars_in_buffer,
598         .unthrottle = pty_unthrottle,
599         .set_termios = pty_set_termios,
600         .ioctl = pty_unix98_ioctl,
601         .shutdown = pty_unix98_shutdown,
602         .resize = pty_resize
603 };
604
605 static const struct tty_operations pty_unix98_ops = {
606         .lookup = pts_unix98_lookup,
607         .install = pty_unix98_install,
608         .remove = pty_unix98_remove,
609         .open = pty_open,
610         .close = pty_close,
611         .write = pty_write,
612         .write_room = pty_write_room,
613         .flush_buffer = pty_flush_buffer,
614         .chars_in_buffer = pty_chars_in_buffer,
615         .unthrottle = pty_unthrottle,
616         .set_termios = pty_set_termios,
617         .shutdown = pty_unix98_shutdown
618 };
619
620 /**
621  *      ptmx_open               -       open a unix 98 pty master
622  *      @inode: inode of device file
623  *      @filp: file pointer to tty
624  *
625  *      Allocate a unix98 pty master device from the ptmx driver.
626  *
627  *      Locking: tty_mutex protects the init_dev work. tty->count should
628  *              protect the rest.
629  *              allocated_ptys_lock handles the list of free pty numbers
630  */
631
632 static int __ptmx_open(struct inode *inode, struct file *filp)
633 {
634         struct tty_struct *tty;
635         int retval;
636         int index;
637
638         nonseekable_open(inode, filp);
639
640         /* find a device that is not in use. */
641         index = devpts_new_index(inode);
642         if (index < 0)
643                 return index;
644
645         mutex_lock(&tty_mutex);
646         tty = tty_init_dev(ptm_driver, index, 1);
647         mutex_unlock(&tty_mutex);
648
649         if (IS_ERR(tty)) {
650                 retval = PTR_ERR(tty);
651                 goto out;
652         }
653
654         set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
655         filp->private_data = tty;
656         file_move(filp, &tty->tty_files);
657
658         retval = devpts_pty_new(inode, tty->link);
659         if (retval)
660                 goto out1;
661
662         retval = ptm_driver->ops->open(tty, filp);
663         if (!retval)
664                 return 0;
665 out1:
666         tty_release_dev(filp);
667         return retval;
668 out:
669         devpts_kill_index(inode, index);
670         return retval;
671 }
672
673 static int ptmx_open(struct inode *inode, struct file *filp)
674 {
675         int ret;
676
677         lock_kernel();
678         ret = __ptmx_open(inode, filp);
679         unlock_kernel();
680         return ret;
681 }
682
683 static struct file_operations ptmx_fops;
684
685 static void __init unix98_pty_init(void)
686 {
687         ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
688         if (!ptm_driver)
689                 panic("Couldn't allocate Unix98 ptm driver");
690         pts_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX);
691         if (!pts_driver)
692                 panic("Couldn't allocate Unix98 pts driver");
693
694         ptm_driver->owner = THIS_MODULE;
695         ptm_driver->driver_name = "pty_master";
696         ptm_driver->name = "ptm";
697         ptm_driver->major = UNIX98_PTY_MASTER_MAJOR;
698         ptm_driver->minor_start = 0;
699         ptm_driver->type = TTY_DRIVER_TYPE_PTY;
700         ptm_driver->subtype = PTY_TYPE_MASTER;
701         ptm_driver->init_termios = tty_std_termios;
702         ptm_driver->init_termios.c_iflag = 0;
703         ptm_driver->init_termios.c_oflag = 0;
704         ptm_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
705         ptm_driver->init_termios.c_lflag = 0;
706         ptm_driver->init_termios.c_ispeed = 38400;
707         ptm_driver->init_termios.c_ospeed = 38400;
708         ptm_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
709                 TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
710         ptm_driver->other = pts_driver;
711         tty_set_operations(ptm_driver, &ptm_unix98_ops);
712
713         pts_driver->owner = THIS_MODULE;
714         pts_driver->driver_name = "pty_slave";
715         pts_driver->name = "pts";
716         pts_driver->major = UNIX98_PTY_SLAVE_MAJOR;
717         pts_driver->minor_start = 0;
718         pts_driver->type = TTY_DRIVER_TYPE_PTY;
719         pts_driver->subtype = PTY_TYPE_SLAVE;
720         pts_driver->init_termios = tty_std_termios;
721         pts_driver->init_termios.c_cflag = B38400 | CS8 | CREAD;
722         pts_driver->init_termios.c_ispeed = 38400;
723         pts_driver->init_termios.c_ospeed = 38400;
724         pts_driver->flags = TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_REAL_RAW |
725                 TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_DEVPTS_MEM;
726         pts_driver->other = ptm_driver;
727         tty_set_operations(pts_driver, &pty_unix98_ops);
728
729         if (tty_register_driver(ptm_driver))
730                 panic("Couldn't register Unix98 ptm driver");
731         if (tty_register_driver(pts_driver))
732                 panic("Couldn't register Unix98 pts driver");
733
734         register_sysctl_table(pty_root_table);
735
736         /* Now create the /dev/ptmx special device */
737         tty_default_fops(&ptmx_fops);
738         ptmx_fops.open = ptmx_open;
739
740         cdev_init(&ptmx_cdev, &ptmx_fops);
741         if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
742             register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
743                 panic("Couldn't register /dev/ptmx driver\n");
744         device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
745 }
746
747 #else
748 static inline void unix98_pty_init(void) { }
749 #endif
750
751 static int __init pty_init(void)
752 {
753         legacy_pty_init();
754         unix98_pty_init();
755         return 0;
756 }
757 module_init(pty_init);