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[mirror_ubuntu-bionic-kernel.git] / drivers / isdn / capi / capi.c
1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
2 *
3 * CAPI 2.0 Interface for Linux
4 *
5 * Copyright 1996 by Carsten Paeth <calle@calle.de>
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/major.h>
16 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/fcntl.h>
19 #include <linux/fs.h>
20 #include <linux/signal.h>
21 #include <linux/mutex.h>
22 #include <linux/mm.h>
23 #include <linux/timer.h>
24 #include <linux/wait.h>
25 #include <linux/tty.h>
26 #include <linux/netdevice.h>
27 #include <linux/ppp_defs.h>
28 #include <linux/if_ppp.h>
29 #include <linux/skbuff.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/poll.h>
33 #include <linux/capi.h>
34 #include <linux/kernelcapi.h>
35 #include <linux/init.h>
36 #include <linux/device.h>
37 #include <linux/moduleparam.h>
38 #include <linux/isdn/capiutil.h>
39 #include <linux/isdn/capicmd.h>
40
41 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
42 MODULE_AUTHOR("Carsten Paeth");
43 MODULE_LICENSE("GPL");
44
45 /* -------- driver information -------------------------------------- */
46
47 static DEFINE_MUTEX(capi_mutex);
48 static struct class *capi_class;
49 static int capi_major = 68; /* allocated */
50
51 module_param_named(major, capi_major, uint, 0);
52
53 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
54 #define CAPINC_NR_PORTS 32
55 #define CAPINC_MAX_PORTS 256
56
57 static int capi_ttyminors = CAPINC_NR_PORTS;
58
59 module_param_named(ttyminors, capi_ttyminors, uint, 0);
60 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
61
62 /* -------- defines ------------------------------------------------- */
63
64 #define CAPINC_MAX_RECVQUEUE 10
65 #define CAPINC_MAX_SENDQUEUE 10
66 #define CAPI_MAX_BLKSIZE 2048
67
68 /* -------- data structures ----------------------------------------- */
69
70 struct capidev;
71 struct capincci;
72 struct capiminor;
73
74 struct ackqueue_entry {
75 struct list_head list;
76 u16 datahandle;
77 };
78
79 struct capiminor {
80 struct kref kref;
81
82 unsigned int minor;
83
84 struct capi20_appl *ap;
85 u32 ncci;
86 atomic_t datahandle;
87 atomic_t msgid;
88
89 struct tty_port port;
90 int ttyinstop;
91 int ttyoutstop;
92
93 struct sk_buff_head inqueue;
94
95 struct sk_buff_head outqueue;
96 int outbytes;
97 struct sk_buff *outskb;
98 spinlock_t outlock;
99
100 /* transmit path */
101 struct list_head ackqueue;
102 int nack;
103 spinlock_t ackqlock;
104 };
105
106 struct capincci {
107 struct list_head list;
108 u32 ncci;
109 struct capidev *cdev;
110 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
111 struct capiminor *minorp;
112 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
113 };
114
115 struct capidev {
116 struct list_head list;
117 struct capi20_appl ap;
118 u16 errcode;
119 unsigned userflags;
120
121 struct sk_buff_head recvqueue;
122 wait_queue_head_t recvwait;
123
124 struct list_head nccis;
125
126 struct mutex lock;
127 };
128
129 /* -------- global variables ---------------------------------------- */
130
131 static DEFINE_MUTEX(capidev_list_lock);
132 static LIST_HEAD(capidev_list);
133
134 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
135
136 static DEFINE_SPINLOCK(capiminors_lock);
137 static struct capiminor **capiminors;
138
139 static struct tty_driver *capinc_tty_driver;
140
141 /* -------- datahandles --------------------------------------------- */
142
143 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
144 {
145 struct ackqueue_entry *n;
146
147 n = kmalloc(sizeof(*n), GFP_ATOMIC);
148 if (unlikely(!n)) {
149 printk(KERN_ERR "capi: alloc datahandle failed\n");
150 return -1;
151 }
152 n->datahandle = datahandle;
153 INIT_LIST_HEAD(&n->list);
154 spin_lock_bh(&mp->ackqlock);
155 list_add_tail(&n->list, &mp->ackqueue);
156 mp->nack++;
157 spin_unlock_bh(&mp->ackqlock);
158 return 0;
159 }
160
161 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
162 {
163 struct ackqueue_entry *p, *tmp;
164
165 spin_lock_bh(&mp->ackqlock);
166 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
167 if (p->datahandle == datahandle) {
168 list_del(&p->list);
169 mp->nack--;
170 spin_unlock_bh(&mp->ackqlock);
171 kfree(p);
172 return 0;
173 }
174 }
175 spin_unlock_bh(&mp->ackqlock);
176 return -1;
177 }
178
179 static void capiminor_del_all_ack(struct capiminor *mp)
180 {
181 struct ackqueue_entry *p, *tmp;
182
183 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
184 list_del(&p->list);
185 kfree(p);
186 mp->nack--;
187 }
188 }
189
190
191 /* -------- struct capiminor ---------------------------------------- */
192
193 static const struct tty_port_operations capiminor_port_ops; /* we have none */
194
195 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
196 {
197 struct capiminor *mp;
198 struct device *dev;
199 unsigned int minor;
200
201 mp = kzalloc(sizeof(*mp), GFP_KERNEL);
202 if (!mp) {
203 printk(KERN_ERR "capi: can't alloc capiminor\n");
204 return NULL;
205 }
206
207 kref_init(&mp->kref);
208
209 mp->ap = ap;
210 mp->ncci = ncci;
211 INIT_LIST_HEAD(&mp->ackqueue);
212 spin_lock_init(&mp->ackqlock);
213
214 skb_queue_head_init(&mp->inqueue);
215 skb_queue_head_init(&mp->outqueue);
216 spin_lock_init(&mp->outlock);
217
218 tty_port_init(&mp->port);
219 mp->port.ops = &capiminor_port_ops;
220
221 /* Allocate the least unused minor number. */
222 spin_lock(&capiminors_lock);
223 for (minor = 0; minor < capi_ttyminors; minor++)
224 if (!capiminors[minor]) {
225 capiminors[minor] = mp;
226 break;
227 }
228 spin_unlock(&capiminors_lock);
229
230 if (minor == capi_ttyminors) {
231 printk(KERN_NOTICE "capi: out of minors\n");
232 goto err_out1;
233 }
234
235 mp->minor = minor;
236
237 dev = tty_register_device(capinc_tty_driver, minor, NULL);
238 if (IS_ERR(dev))
239 goto err_out2;
240
241 return mp;
242
243 err_out2:
244 spin_lock(&capiminors_lock);
245 capiminors[minor] = NULL;
246 spin_unlock(&capiminors_lock);
247
248 err_out1:
249 kfree(mp);
250 return NULL;
251 }
252
253 static void capiminor_destroy(struct kref *kref)
254 {
255 struct capiminor *mp = container_of(kref, struct capiminor, kref);
256
257 kfree_skb(mp->outskb);
258 skb_queue_purge(&mp->inqueue);
259 skb_queue_purge(&mp->outqueue);
260 capiminor_del_all_ack(mp);
261 kfree(mp);
262 }
263
264 static struct capiminor *capiminor_get(unsigned int minor)
265 {
266 struct capiminor *mp;
267
268 spin_lock(&capiminors_lock);
269 mp = capiminors[minor];
270 if (mp)
271 kref_get(&mp->kref);
272 spin_unlock(&capiminors_lock);
273
274 return mp;
275 }
276
277 static inline void capiminor_put(struct capiminor *mp)
278 {
279 kref_put(&mp->kref, capiminor_destroy);
280 }
281
282 static void capiminor_free(struct capiminor *mp)
283 {
284 tty_unregister_device(capinc_tty_driver, mp->minor);
285
286 spin_lock(&capiminors_lock);
287 capiminors[mp->minor] = NULL;
288 spin_unlock(&capiminors_lock);
289
290 capiminor_put(mp);
291 }
292
293 /* -------- struct capincci ----------------------------------------- */
294
295 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
296 {
297 if (cdev->userflags & CAPIFLAG_HIGHJACKING)
298 np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
299 }
300
301 static void capincci_free_minor(struct capincci *np)
302 {
303 struct capiminor *mp = np->minorp;
304 struct tty_struct *tty;
305
306 if (mp) {
307 tty = tty_port_tty_get(&mp->port);
308 if (tty) {
309 tty_vhangup(tty);
310 tty_kref_put(tty);
311 }
312
313 capiminor_free(mp);
314 }
315 }
316
317 static inline unsigned int capincci_minor_opencount(struct capincci *np)
318 {
319 struct capiminor *mp = np->minorp;
320 unsigned int count = 0;
321 struct tty_struct *tty;
322
323 if (mp) {
324 tty = tty_port_tty_get(&mp->port);
325 if (tty) {
326 count = tty->count;
327 tty_kref_put(tty);
328 }
329 }
330 return count;
331 }
332
333 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
334
335 static inline void
336 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
337 static inline void capincci_free_minor(struct capincci *np) { }
338
339 static inline unsigned int capincci_minor_opencount(struct capincci *np)
340 {
341 return 0;
342 }
343
344 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
345
346 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
347 {
348 struct capincci *np;
349
350 np = kzalloc(sizeof(*np), GFP_KERNEL);
351 if (!np)
352 return NULL;
353 np->ncci = ncci;
354 np->cdev = cdev;
355
356 capincci_alloc_minor(cdev, np);
357
358 list_add_tail(&np->list, &cdev->nccis);
359
360 return np;
361 }
362
363 static void capincci_free(struct capidev *cdev, u32 ncci)
364 {
365 struct capincci *np, *tmp;
366
367 list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
368 if (ncci == 0xffffffff || np->ncci == ncci) {
369 capincci_free_minor(np);
370 list_del(&np->list);
371 kfree(np);
372 }
373 }
374
375 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
376 {
377 struct capincci *np;
378
379 list_for_each_entry(np, &cdev->nccis, list)
380 if (np->ncci == ncci)
381 return np;
382 return NULL;
383 }
384
385 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
386 /* -------- handle data queue --------------------------------------- */
387
388 static struct sk_buff *
389 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
390 {
391 struct sk_buff *nskb;
392 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
393 if (nskb) {
394 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
395 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
396 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
397 capimsg_setu16(s, 2, mp->ap->applid);
398 capimsg_setu8 (s, 4, CAPI_DATA_B3);
399 capimsg_setu8 (s, 5, CAPI_RESP);
400 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
401 capimsg_setu32(s, 8, mp->ncci);
402 capimsg_setu16(s, 12, datahandle);
403 }
404 return nskb;
405 }
406
407 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
408 {
409 unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
410 struct tty_struct *tty;
411 struct sk_buff *nskb;
412 u16 errcode, datahandle;
413 struct tty_ldisc *ld;
414 int ret = -1;
415
416 tty = tty_port_tty_get(&mp->port);
417 if (!tty) {
418 pr_debug("capi: currently no receiver\n");
419 return -1;
420 }
421
422 ld = tty_ldisc_ref(tty);
423 if (!ld) {
424 /* fatal error, do not requeue */
425 ret = 0;
426 kfree_skb(skb);
427 goto deref_tty;
428 }
429
430 if (ld->ops->receive_buf == NULL) {
431 pr_debug("capi: ldisc has no receive_buf function\n");
432 /* fatal error, do not requeue */
433 goto free_skb;
434 }
435 if (mp->ttyinstop) {
436 pr_debug("capi: recv tty throttled\n");
437 goto deref_ldisc;
438 }
439
440 if (tty->receive_room < datalen) {
441 pr_debug("capi: no room in tty\n");
442 goto deref_ldisc;
443 }
444
445 nskb = gen_data_b3_resp_for(mp, skb);
446 if (!nskb) {
447 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
448 goto deref_ldisc;
449 }
450
451 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
452
453 errcode = capi20_put_message(mp->ap, nskb);
454
455 if (errcode == CAPI_NOERROR) {
456 skb_pull(skb, CAPIMSG_LEN(skb->data));
457 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
458 datahandle, skb->len);
459 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
460 } else {
461 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
462 errcode);
463 kfree_skb(nskb);
464
465 if (errcode == CAPI_SENDQUEUEFULL)
466 goto deref_ldisc;
467 }
468
469 free_skb:
470 ret = 0;
471 kfree_skb(skb);
472
473 deref_ldisc:
474 tty_ldisc_deref(ld);
475
476 deref_tty:
477 tty_kref_put(tty);
478 return ret;
479 }
480
481 static void handle_minor_recv(struct capiminor *mp)
482 {
483 struct sk_buff *skb;
484
485 while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
486 if (handle_recv_skb(mp, skb) < 0) {
487 skb_queue_head(&mp->inqueue, skb);
488 return;
489 }
490 }
491
492 static void handle_minor_send(struct capiminor *mp)
493 {
494 struct tty_struct *tty;
495 struct sk_buff *skb;
496 u16 len;
497 u16 errcode;
498 u16 datahandle;
499
500 tty = tty_port_tty_get(&mp->port);
501 if (!tty)
502 return;
503
504 if (mp->ttyoutstop) {
505 pr_debug("capi: send: tty stopped\n");
506 tty_kref_put(tty);
507 return;
508 }
509
510 while (1) {
511 spin_lock_bh(&mp->outlock);
512 skb = __skb_dequeue(&mp->outqueue);
513 if (!skb) {
514 spin_unlock_bh(&mp->outlock);
515 break;
516 }
517 len = (u16)skb->len;
518 mp->outbytes -= len;
519 spin_unlock_bh(&mp->outlock);
520
521 datahandle = atomic_inc_return(&mp->datahandle);
522 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
523 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
524 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
525 capimsg_setu16(skb->data, 2, mp->ap->applid);
526 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
527 capimsg_setu8 (skb->data, 5, CAPI_REQ);
528 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
529 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
530 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
531 capimsg_setu16(skb->data, 16, len); /* Data length */
532 capimsg_setu16(skb->data, 18, datahandle);
533 capimsg_setu16(skb->data, 20, 0); /* Flags */
534
535 if (capiminor_add_ack(mp, datahandle) < 0) {
536 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
537
538 spin_lock_bh(&mp->outlock);
539 __skb_queue_head(&mp->outqueue, skb);
540 mp->outbytes += len;
541 spin_unlock_bh(&mp->outlock);
542
543 break;
544 }
545 errcode = capi20_put_message(mp->ap, skb);
546 if (errcode == CAPI_NOERROR) {
547 pr_debug("capi: DATA_B3_REQ %u len=%u\n",
548 datahandle, len);
549 continue;
550 }
551 capiminor_del_ack(mp, datahandle);
552
553 if (errcode == CAPI_SENDQUEUEFULL) {
554 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
555
556 spin_lock_bh(&mp->outlock);
557 __skb_queue_head(&mp->outqueue, skb);
558 mp->outbytes += len;
559 spin_unlock_bh(&mp->outlock);
560
561 break;
562 }
563
564 /* ups, drop packet */
565 printk(KERN_ERR "capi: put_message = %x\n", errcode);
566 kfree_skb(skb);
567 }
568 tty_kref_put(tty);
569 }
570
571 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
572 /* -------- function called by lower level -------------------------- */
573
574 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
575 {
576 struct capidev *cdev = ap->private;
577 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
578 struct tty_struct *tty;
579 struct capiminor *mp;
580 u16 datahandle;
581 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
582 struct capincci *np;
583
584 mutex_lock(&cdev->lock);
585
586 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
587 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
588 if ((info & 0xff00) == 0)
589 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
590 }
591 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
592 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
593
594 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
595 skb_queue_tail(&cdev->recvqueue, skb);
596 wake_up_interruptible(&cdev->recvwait);
597 goto unlock_out;
598 }
599
600 np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
601 if (!np) {
602 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
603 skb_queue_tail(&cdev->recvqueue, skb);
604 wake_up_interruptible(&cdev->recvwait);
605 goto unlock_out;
606 }
607
608 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
609 skb_queue_tail(&cdev->recvqueue, skb);
610 wake_up_interruptible(&cdev->recvwait);
611
612 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
613
614 mp = np->minorp;
615 if (!mp) {
616 skb_queue_tail(&cdev->recvqueue, skb);
617 wake_up_interruptible(&cdev->recvwait);
618 goto unlock_out;
619 }
620 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
621 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
622 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
623 datahandle, skb->len-CAPIMSG_LEN(skb->data));
624 skb_queue_tail(&mp->inqueue, skb);
625
626 handle_minor_recv(mp);
627
628 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
629
630 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
631 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
632 datahandle,
633 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
634 kfree_skb(skb);
635 capiminor_del_ack(mp, datahandle);
636 tty = tty_port_tty_get(&mp->port);
637 if (tty) {
638 tty_wakeup(tty);
639 tty_kref_put(tty);
640 }
641 handle_minor_send(mp);
642
643 } else {
644 /* ups, let capi application handle it :-) */
645 skb_queue_tail(&cdev->recvqueue, skb);
646 wake_up_interruptible(&cdev->recvwait);
647 }
648 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
649
650 unlock_out:
651 mutex_unlock(&cdev->lock);
652 }
653
654 /* -------- file_operations for capidev ----------------------------- */
655
656 static ssize_t
657 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
658 {
659 struct capidev *cdev = file->private_data;
660 struct sk_buff *skb;
661 size_t copied;
662 int err;
663
664 if (!cdev->ap.applid)
665 return -ENODEV;
666
667 skb = skb_dequeue(&cdev->recvqueue);
668 if (!skb) {
669 if (file->f_flags & O_NONBLOCK)
670 return -EAGAIN;
671 err = wait_event_interruptible(cdev->recvwait,
672 (skb = skb_dequeue(&cdev->recvqueue)));
673 if (err)
674 return err;
675 }
676 if (skb->len > count) {
677 skb_queue_head(&cdev->recvqueue, skb);
678 return -EMSGSIZE;
679 }
680 if (copy_to_user(buf, skb->data, skb->len)) {
681 skb_queue_head(&cdev->recvqueue, skb);
682 return -EFAULT;
683 }
684 copied = skb->len;
685
686 kfree_skb(skb);
687
688 return copied;
689 }
690
691 static ssize_t
692 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
693 {
694 struct capidev *cdev = file->private_data;
695 struct sk_buff *skb;
696 u16 mlen;
697
698 if (!cdev->ap.applid)
699 return -ENODEV;
700
701 skb = alloc_skb(count, GFP_USER);
702 if (!skb)
703 return -ENOMEM;
704
705 if (copy_from_user(skb_put(skb, count), buf, count)) {
706 kfree_skb(skb);
707 return -EFAULT;
708 }
709 mlen = CAPIMSG_LEN(skb->data);
710 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
711 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
712 kfree_skb(skb);
713 return -EINVAL;
714 }
715 } else {
716 if (mlen != count) {
717 kfree_skb(skb);
718 return -EINVAL;
719 }
720 }
721 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
722
723 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
724 mutex_lock(&cdev->lock);
725 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
726 mutex_unlock(&cdev->lock);
727 }
728
729 cdev->errcode = capi20_put_message(&cdev->ap, skb);
730
731 if (cdev->errcode) {
732 kfree_skb(skb);
733 return -EIO;
734 }
735 return count;
736 }
737
738 static unsigned int
739 capi_poll(struct file *file, poll_table * wait)
740 {
741 struct capidev *cdev = file->private_data;
742 unsigned int mask = 0;
743
744 if (!cdev->ap.applid)
745 return POLLERR;
746
747 poll_wait(file, &(cdev->recvwait), wait);
748 mask = POLLOUT | POLLWRNORM;
749 if (!skb_queue_empty(&cdev->recvqueue))
750 mask |= POLLIN | POLLRDNORM;
751 return mask;
752 }
753
754 static int
755 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
756 {
757 struct capidev *cdev = file->private_data;
758 capi_ioctl_struct data;
759 int retval = -EINVAL;
760 void __user *argp = (void __user *)arg;
761
762 switch (cmd) {
763 case CAPI_REGISTER:
764 mutex_lock(&cdev->lock);
765
766 if (cdev->ap.applid) {
767 retval = -EEXIST;
768 goto register_out;
769 }
770 if (copy_from_user(&cdev->ap.rparam, argp,
771 sizeof(struct capi_register_params))) {
772 retval = -EFAULT;
773 goto register_out;
774 }
775 cdev->ap.private = cdev;
776 cdev->ap.recv_message = capi_recv_message;
777 cdev->errcode = capi20_register(&cdev->ap);
778 retval = (int)cdev->ap.applid;
779 if (cdev->errcode) {
780 cdev->ap.applid = 0;
781 retval = -EIO;
782 }
783
784 register_out:
785 mutex_unlock(&cdev->lock);
786 return retval;
787
788 case CAPI_GET_VERSION:
789 {
790 if (copy_from_user(&data.contr, argp,
791 sizeof(data.contr)))
792 return -EFAULT;
793 cdev->errcode = capi20_get_version(data.contr, &data.version);
794 if (cdev->errcode)
795 return -EIO;
796 if (copy_to_user(argp, &data.version,
797 sizeof(data.version)))
798 return -EFAULT;
799 }
800 return 0;
801
802 case CAPI_GET_SERIAL:
803 {
804 if (copy_from_user(&data.contr, argp,
805 sizeof(data.contr)))
806 return -EFAULT;
807 cdev->errcode = capi20_get_serial (data.contr, data.serial);
808 if (cdev->errcode)
809 return -EIO;
810 if (copy_to_user(argp, data.serial,
811 sizeof(data.serial)))
812 return -EFAULT;
813 }
814 return 0;
815 case CAPI_GET_PROFILE:
816 {
817 if (copy_from_user(&data.contr, argp,
818 sizeof(data.contr)))
819 return -EFAULT;
820
821 if (data.contr == 0) {
822 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
823 if (cdev->errcode)
824 return -EIO;
825
826 retval = copy_to_user(argp,
827 &data.profile.ncontroller,
828 sizeof(data.profile.ncontroller));
829
830 } else {
831 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
832 if (cdev->errcode)
833 return -EIO;
834
835 retval = copy_to_user(argp, &data.profile,
836 sizeof(data.profile));
837 }
838 if (retval)
839 return -EFAULT;
840 }
841 return 0;
842
843 case CAPI_GET_MANUFACTURER:
844 {
845 if (copy_from_user(&data.contr, argp,
846 sizeof(data.contr)))
847 return -EFAULT;
848 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
849 if (cdev->errcode)
850 return -EIO;
851
852 if (copy_to_user(argp, data.manufacturer,
853 sizeof(data.manufacturer)))
854 return -EFAULT;
855
856 }
857 return 0;
858 case CAPI_GET_ERRCODE:
859 data.errcode = cdev->errcode;
860 cdev->errcode = CAPI_NOERROR;
861 if (arg) {
862 if (copy_to_user(argp, &data.errcode,
863 sizeof(data.errcode)))
864 return -EFAULT;
865 }
866 return data.errcode;
867
868 case CAPI_INSTALLED:
869 if (capi20_isinstalled() == CAPI_NOERROR)
870 return 0;
871 return -ENXIO;
872
873 case CAPI_MANUFACTURER_CMD:
874 {
875 struct capi_manufacturer_cmd mcmd;
876 if (!capable(CAP_SYS_ADMIN))
877 return -EPERM;
878 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
879 return -EFAULT;
880 return capi20_manufacturer(mcmd.cmd, mcmd.data);
881 }
882 return 0;
883
884 case CAPI_SET_FLAGS:
885 case CAPI_CLR_FLAGS: {
886 unsigned userflags;
887
888 if (copy_from_user(&userflags, argp, sizeof(userflags)))
889 return -EFAULT;
890
891 mutex_lock(&cdev->lock);
892 if (cmd == CAPI_SET_FLAGS)
893 cdev->userflags |= userflags;
894 else
895 cdev->userflags &= ~userflags;
896 mutex_unlock(&cdev->lock);
897 return 0;
898 }
899 case CAPI_GET_FLAGS:
900 if (copy_to_user(argp, &cdev->userflags,
901 sizeof(cdev->userflags)))
902 return -EFAULT;
903 return 0;
904
905 case CAPI_NCCI_OPENCOUNT: {
906 struct capincci *nccip;
907 unsigned ncci;
908 int count = 0;
909
910 if (copy_from_user(&ncci, argp, sizeof(ncci)))
911 return -EFAULT;
912
913 mutex_lock(&cdev->lock);
914 nccip = capincci_find(cdev, (u32)ncci);
915 if (nccip)
916 count = capincci_minor_opencount(nccip);
917 mutex_unlock(&cdev->lock);
918 return count;
919 }
920
921 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
922 case CAPI_NCCI_GETUNIT: {
923 struct capincci *nccip;
924 struct capiminor *mp;
925 unsigned ncci;
926 int unit = -ESRCH;
927
928 if (copy_from_user(&ncci, argp, sizeof(ncci)))
929 return -EFAULT;
930
931 mutex_lock(&cdev->lock);
932 nccip = capincci_find(cdev, (u32)ncci);
933 if (nccip) {
934 mp = nccip->minorp;
935 if (mp)
936 unit = mp->minor;
937 }
938 mutex_unlock(&cdev->lock);
939 return unit;
940 }
941 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
942
943 default:
944 return -EINVAL;
945 }
946 }
947
948 static long
949 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
950 {
951 int ret;
952
953 mutex_lock(&capi_mutex);
954 ret = capi_ioctl(file, cmd, arg);
955 mutex_unlock(&capi_mutex);
956
957 return ret;
958 }
959
960 static int capi_open(struct inode *inode, struct file *file)
961 {
962 struct capidev *cdev;
963
964 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
965 if (!cdev)
966 return -ENOMEM;
967
968 mutex_init(&cdev->lock);
969 skb_queue_head_init(&cdev->recvqueue);
970 init_waitqueue_head(&cdev->recvwait);
971 INIT_LIST_HEAD(&cdev->nccis);
972 file->private_data = cdev;
973
974 mutex_lock(&capidev_list_lock);
975 list_add_tail(&cdev->list, &capidev_list);
976 mutex_unlock(&capidev_list_lock);
977
978 return nonseekable_open(inode, file);
979 }
980
981 static int capi_release(struct inode *inode, struct file *file)
982 {
983 struct capidev *cdev = file->private_data;
984
985 mutex_lock(&capidev_list_lock);
986 list_del(&cdev->list);
987 mutex_unlock(&capidev_list_lock);
988
989 if (cdev->ap.applid)
990 capi20_release(&cdev->ap);
991 skb_queue_purge(&cdev->recvqueue);
992 capincci_free(cdev, 0xffffffff);
993
994 kfree(cdev);
995 return 0;
996 }
997
998 static const struct file_operations capi_fops =
999 {
1000 .owner = THIS_MODULE,
1001 .llseek = no_llseek,
1002 .read = capi_read,
1003 .write = capi_write,
1004 .poll = capi_poll,
1005 .unlocked_ioctl = capi_unlocked_ioctl,
1006 .open = capi_open,
1007 .release = capi_release,
1008 };
1009
1010 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1011 /* -------- tty_operations for capincci ----------------------------- */
1012
1013 static int
1014 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1015 {
1016 int idx = tty->index;
1017 struct capiminor *mp = capiminor_get(idx);
1018 int ret = tty_standard_install(driver, tty);
1019
1020 if (ret == 0)
1021 tty->driver_data = mp;
1022 else
1023 capiminor_put(mp);
1024 return ret;
1025 }
1026
1027 static void capinc_tty_cleanup(struct tty_struct *tty)
1028 {
1029 struct capiminor *mp = tty->driver_data;
1030 tty->driver_data = NULL;
1031 capiminor_put(mp);
1032 }
1033
1034 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1035 {
1036 struct capiminor *mp = tty->driver_data;
1037 int err;
1038
1039 err = tty_port_open(&mp->port, tty, filp);
1040 if (err)
1041 return err;
1042
1043 handle_minor_recv(mp);
1044 return 0;
1045 }
1046
1047 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1048 {
1049 struct capiminor *mp = tty->driver_data;
1050
1051 tty_port_close(&mp->port, tty, filp);
1052 }
1053
1054 static int capinc_tty_write(struct tty_struct *tty,
1055 const unsigned char *buf, int count)
1056 {
1057 struct capiminor *mp = tty->driver_data;
1058 struct sk_buff *skb;
1059
1060 pr_debug("capinc_tty_write(count=%d)\n", count);
1061
1062 spin_lock_bh(&mp->outlock);
1063 skb = mp->outskb;
1064 if (skb) {
1065 mp->outskb = NULL;
1066 __skb_queue_tail(&mp->outqueue, skb);
1067 mp->outbytes += skb->len;
1068 }
1069
1070 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1071 if (!skb) {
1072 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1073 spin_unlock_bh(&mp->outlock);
1074 return -ENOMEM;
1075 }
1076
1077 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1078 memcpy(skb_put(skb, count), buf, count);
1079
1080 __skb_queue_tail(&mp->outqueue, skb);
1081 mp->outbytes += skb->len;
1082 spin_unlock_bh(&mp->outlock);
1083
1084 handle_minor_send(mp);
1085
1086 return count;
1087 }
1088
1089 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1090 {
1091 struct capiminor *mp = tty->driver_data;
1092 bool invoke_send = false;
1093 struct sk_buff *skb;
1094 int ret = 1;
1095
1096 pr_debug("capinc_put_char(%u)\n", ch);
1097
1098 spin_lock_bh(&mp->outlock);
1099 skb = mp->outskb;
1100 if (skb) {
1101 if (skb_tailroom(skb) > 0) {
1102 *(skb_put(skb, 1)) = ch;
1103 goto unlock_out;
1104 }
1105 mp->outskb = NULL;
1106 __skb_queue_tail(&mp->outqueue, skb);
1107 mp->outbytes += skb->len;
1108 invoke_send = true;
1109 }
1110
1111 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1112 if (skb) {
1113 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1114 *(skb_put(skb, 1)) = ch;
1115 mp->outskb = skb;
1116 } else {
1117 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1118 ret = 0;
1119 }
1120
1121 unlock_out:
1122 spin_unlock_bh(&mp->outlock);
1123
1124 if (invoke_send)
1125 handle_minor_send(mp);
1126
1127 return ret;
1128 }
1129
1130 static void capinc_tty_flush_chars(struct tty_struct *tty)
1131 {
1132 struct capiminor *mp = tty->driver_data;
1133 struct sk_buff *skb;
1134
1135 pr_debug("capinc_tty_flush_chars\n");
1136
1137 spin_lock_bh(&mp->outlock);
1138 skb = mp->outskb;
1139 if (skb) {
1140 mp->outskb = NULL;
1141 __skb_queue_tail(&mp->outqueue, skb);
1142 mp->outbytes += skb->len;
1143 spin_unlock_bh(&mp->outlock);
1144
1145 handle_minor_send(mp);
1146 } else
1147 spin_unlock_bh(&mp->outlock);
1148
1149 handle_minor_recv(mp);
1150 }
1151
1152 static int capinc_tty_write_room(struct tty_struct *tty)
1153 {
1154 struct capiminor *mp = tty->driver_data;
1155 int room;
1156
1157 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1158 room *= CAPI_MAX_BLKSIZE;
1159 pr_debug("capinc_tty_write_room = %d\n", room);
1160 return room;
1161 }
1162
1163 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1164 {
1165 struct capiminor *mp = tty->driver_data;
1166
1167 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1168 mp->outbytes, mp->nack,
1169 skb_queue_len(&mp->outqueue),
1170 skb_queue_len(&mp->inqueue));
1171 return mp->outbytes;
1172 }
1173
1174 static int capinc_tty_ioctl(struct tty_struct *tty,
1175 unsigned int cmd, unsigned long arg)
1176 {
1177 return -ENOIOCTLCMD;
1178 }
1179
1180 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1181 {
1182 pr_debug("capinc_tty_set_termios\n");
1183 }
1184
1185 static void capinc_tty_throttle(struct tty_struct *tty)
1186 {
1187 struct capiminor *mp = tty->driver_data;
1188 pr_debug("capinc_tty_throttle\n");
1189 mp->ttyinstop = 1;
1190 }
1191
1192 static void capinc_tty_unthrottle(struct tty_struct *tty)
1193 {
1194 struct capiminor *mp = tty->driver_data;
1195
1196 pr_debug("capinc_tty_unthrottle\n");
1197 mp->ttyinstop = 0;
1198 handle_minor_recv(mp);
1199 }
1200
1201 static void capinc_tty_stop(struct tty_struct *tty)
1202 {
1203 struct capiminor *mp = tty->driver_data;
1204
1205 pr_debug("capinc_tty_stop\n");
1206 mp->ttyoutstop = 1;
1207 }
1208
1209 static void capinc_tty_start(struct tty_struct *tty)
1210 {
1211 struct capiminor *mp = tty->driver_data;
1212
1213 pr_debug("capinc_tty_start\n");
1214 mp->ttyoutstop = 0;
1215 handle_minor_send(mp);
1216 }
1217
1218 static void capinc_tty_hangup(struct tty_struct *tty)
1219 {
1220 struct capiminor *mp = tty->driver_data;
1221
1222 pr_debug("capinc_tty_hangup\n");
1223 tty_port_hangup(&mp->port);
1224 }
1225
1226 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1227 {
1228 pr_debug("capinc_tty_break_ctl(%d)\n", state);
1229 return 0;
1230 }
1231
1232 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1233 {
1234 pr_debug("capinc_tty_flush_buffer\n");
1235 }
1236
1237 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1238 {
1239 pr_debug("capinc_tty_set_ldisc\n");
1240 }
1241
1242 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1243 {
1244 pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1245 }
1246
1247 static const struct tty_operations capinc_ops = {
1248 .open = capinc_tty_open,
1249 .close = capinc_tty_close,
1250 .write = capinc_tty_write,
1251 .put_char = capinc_tty_put_char,
1252 .flush_chars = capinc_tty_flush_chars,
1253 .write_room = capinc_tty_write_room,
1254 .chars_in_buffer = capinc_tty_chars_in_buffer,
1255 .ioctl = capinc_tty_ioctl,
1256 .set_termios = capinc_tty_set_termios,
1257 .throttle = capinc_tty_throttle,
1258 .unthrottle = capinc_tty_unthrottle,
1259 .stop = capinc_tty_stop,
1260 .start = capinc_tty_start,
1261 .hangup = capinc_tty_hangup,
1262 .break_ctl = capinc_tty_break_ctl,
1263 .flush_buffer = capinc_tty_flush_buffer,
1264 .set_ldisc = capinc_tty_set_ldisc,
1265 .send_xchar = capinc_tty_send_xchar,
1266 .install = capinc_tty_install,
1267 .cleanup = capinc_tty_cleanup,
1268 };
1269
1270 static int __init capinc_tty_init(void)
1271 {
1272 struct tty_driver *drv;
1273 int err;
1274
1275 if (capi_ttyminors > CAPINC_MAX_PORTS)
1276 capi_ttyminors = CAPINC_MAX_PORTS;
1277 if (capi_ttyminors <= 0)
1278 capi_ttyminors = CAPINC_NR_PORTS;
1279
1280 capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1281 GFP_KERNEL);
1282 if (!capiminors)
1283 return -ENOMEM;
1284
1285 drv = alloc_tty_driver(capi_ttyminors);
1286 if (!drv) {
1287 kfree(capiminors);
1288 return -ENOMEM;
1289 }
1290 drv->driver_name = "capi_nc";
1291 drv->name = "capi";
1292 drv->major = 0;
1293 drv->minor_start = 0;
1294 drv->type = TTY_DRIVER_TYPE_SERIAL;
1295 drv->subtype = SERIAL_TYPE_NORMAL;
1296 drv->init_termios = tty_std_termios;
1297 drv->init_termios.c_iflag = ICRNL;
1298 drv->init_termios.c_oflag = OPOST | ONLCR;
1299 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1300 drv->init_termios.c_lflag = 0;
1301 drv->flags =
1302 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1303 TTY_DRIVER_DYNAMIC_DEV;
1304 tty_set_operations(drv, &capinc_ops);
1305
1306 err = tty_register_driver(drv);
1307 if (err) {
1308 put_tty_driver(drv);
1309 kfree(capiminors);
1310 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1311 return err;
1312 }
1313 capinc_tty_driver = drv;
1314 return 0;
1315 }
1316
1317 static void __exit capinc_tty_exit(void)
1318 {
1319 tty_unregister_driver(capinc_tty_driver);
1320 put_tty_driver(capinc_tty_driver);
1321 kfree(capiminors);
1322 }
1323
1324 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1325
1326 static inline int capinc_tty_init(void)
1327 {
1328 return 0;
1329 }
1330
1331 static inline void capinc_tty_exit(void) { }
1332
1333 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1334
1335 /* -------- /proc functions ----------------------------------------- */
1336
1337 /*
1338 * /proc/capi/capi20:
1339 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1340 */
1341 static int capi20_proc_show(struct seq_file *m, void *v)
1342 {
1343 struct capidev *cdev;
1344 struct list_head *l;
1345
1346 mutex_lock(&capidev_list_lock);
1347 list_for_each(l, &capidev_list) {
1348 cdev = list_entry(l, struct capidev, list);
1349 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1350 cdev->ap.applid,
1351 cdev->ap.nrecvctlpkt,
1352 cdev->ap.nrecvdatapkt,
1353 cdev->ap.nsentctlpkt,
1354 cdev->ap.nsentdatapkt);
1355 }
1356 mutex_unlock(&capidev_list_lock);
1357 return 0;
1358 }
1359
1360 static int capi20_proc_open(struct inode *inode, struct file *file)
1361 {
1362 return single_open(file, capi20_proc_show, NULL);
1363 }
1364
1365 static const struct file_operations capi20_proc_fops = {
1366 .owner = THIS_MODULE,
1367 .open = capi20_proc_open,
1368 .read = seq_read,
1369 .llseek = seq_lseek,
1370 .release = single_release,
1371 };
1372
1373 /*
1374 * /proc/capi/capi20ncci:
1375 * applid ncci
1376 */
1377 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1378 {
1379 struct capidev *cdev;
1380 struct capincci *np;
1381
1382 mutex_lock(&capidev_list_lock);
1383 list_for_each_entry(cdev, &capidev_list, list) {
1384 mutex_lock(&cdev->lock);
1385 list_for_each_entry(np, &cdev->nccis, list)
1386 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1387 mutex_unlock(&cdev->lock);
1388 }
1389 mutex_unlock(&capidev_list_lock);
1390 return 0;
1391 }
1392
1393 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1394 {
1395 return single_open(file, capi20ncci_proc_show, NULL);
1396 }
1397
1398 static const struct file_operations capi20ncci_proc_fops = {
1399 .owner = THIS_MODULE,
1400 .open = capi20ncci_proc_open,
1401 .read = seq_read,
1402 .llseek = seq_lseek,
1403 .release = single_release,
1404 };
1405
1406 static void __init proc_init(void)
1407 {
1408 proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1409 proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1410 }
1411
1412 static void __exit proc_exit(void)
1413 {
1414 remove_proc_entry("capi/capi20", NULL);
1415 remove_proc_entry("capi/capi20ncci", NULL);
1416 }
1417
1418 /* -------- init function and module interface ---------------------- */
1419
1420
1421 static int __init capi_init(void)
1422 {
1423 const char *compileinfo;
1424 int major_ret;
1425
1426 major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1427 if (major_ret < 0) {
1428 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1429 return major_ret;
1430 }
1431 capi_class = class_create(THIS_MODULE, "capi");
1432 if (IS_ERR(capi_class)) {
1433 unregister_chrdev(capi_major, "capi20");
1434 return PTR_ERR(capi_class);
1435 }
1436
1437 device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1438
1439 if (capinc_tty_init() < 0) {
1440 device_destroy(capi_class, MKDEV(capi_major, 0));
1441 class_destroy(capi_class);
1442 unregister_chrdev(capi_major, "capi20");
1443 return -ENOMEM;
1444 }
1445
1446 proc_init();
1447
1448 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1449 compileinfo = " (middleware)";
1450 #else
1451 compileinfo = " (no middleware)";
1452 #endif
1453 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1454 capi_major, compileinfo);
1455
1456 return 0;
1457 }
1458
1459 static void __exit capi_exit(void)
1460 {
1461 proc_exit();
1462
1463 device_destroy(capi_class, MKDEV(capi_major, 0));
1464 class_destroy(capi_class);
1465 unregister_chrdev(capi_major, "capi20");
1466
1467 capinc_tty_exit();
1468 }
1469
1470 module_init(capi_init);
1471 module_exit(capi_exit);
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