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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / drivers / isdn / capi / capi.c
blobac6f72b455d174fa97c317bce1475946de7a83eb
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/ppp-ioctl.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 unsigned int minor;
81
82 struct capi20_appl *ap;
83 u32 ncci;
84 atomic_t datahandle;
85 atomic_t msgid;
86
87 struct tty_port port;
88 int ttyinstop;
89 int ttyoutstop;
90
91 struct sk_buff_head inqueue;
92
93 struct sk_buff_head outqueue;
94 int outbytes;
95 struct sk_buff *outskb;
96 spinlock_t outlock;
97
98 /* transmit path */
99 struct list_head ackqueue;
100 int nack;
101 spinlock_t ackqlock;
102 };
103
104 struct capincci {
105 struct list_head list;
106 u32 ncci;
107 struct capidev *cdev;
108 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
109 struct capiminor *minorp;
110 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
111 };
112
113 struct capidev {
114 struct list_head list;
115 struct capi20_appl ap;
116 u16 errcode;
117 unsigned userflags;
118
119 struct sk_buff_head recvqueue;
120 wait_queue_head_t recvwait;
121
122 struct list_head nccis;
123
124 struct mutex lock;
125 };
126
127 /* -------- global variables ---------------------------------------- */
128
129 static DEFINE_MUTEX(capidev_list_lock);
130 static LIST_HEAD(capidev_list);
131
132 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
133
134 static DEFINE_SPINLOCK(capiminors_lock);
135 static struct capiminor **capiminors;
136
137 static struct tty_driver *capinc_tty_driver;
138
139 /* -------- datahandles --------------------------------------------- */
140
141 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
142 {
143 struct ackqueue_entry *n;
144
145 n = kmalloc(sizeof(*n), GFP_ATOMIC);
146 if (unlikely(!n)) {
147 printk(KERN_ERR "capi: alloc datahandle failed\n");
148 return -1;
149 }
150 n->datahandle = datahandle;
151 INIT_LIST_HEAD(&n->list);
152 spin_lock_bh(&mp->ackqlock);
153 list_add_tail(&n->list, &mp->ackqueue);
154 mp->nack++;
155 spin_unlock_bh(&mp->ackqlock);
156 return 0;
157 }
158
159 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
160 {
161 struct ackqueue_entry *p, *tmp;
162
163 spin_lock_bh(&mp->ackqlock);
164 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
165 if (p->datahandle == datahandle) {
166 list_del(&p->list);
167 mp->nack--;
168 spin_unlock_bh(&mp->ackqlock);
169 kfree(p);
170 return 0;
171 }
172 }
173 spin_unlock_bh(&mp->ackqlock);
174 return -1;
175 }
176
177 static void capiminor_del_all_ack(struct capiminor *mp)
178 {
179 struct ackqueue_entry *p, *tmp;
180
181 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
182 list_del(&p->list);
183 kfree(p);
184 mp->nack--;
185 }
186 }
187
188
189 /* -------- struct capiminor ---------------------------------------- */
190
191 static void capiminor_destroy(struct tty_port *port)
192 {
193 struct capiminor *mp = container_of(port, struct capiminor, port);
194
195 kfree_skb(mp->outskb);
196 skb_queue_purge(&mp->inqueue);
197 skb_queue_purge(&mp->outqueue);
198 capiminor_del_all_ack(mp);
199 kfree(mp);
200 }
201
202 static const struct tty_port_operations capiminor_port_ops = {
203 .destruct = capiminor_destroy,
204 };
205
206 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
207 {
208 struct capiminor *mp;
209 struct device *dev;
210 unsigned int minor;
211
212 mp = kzalloc(sizeof(*mp), GFP_KERNEL);
213 if (!mp) {
214 printk(KERN_ERR "capi: can't alloc capiminor\n");
215 return NULL;
216 }
217
218 mp->ap = ap;
219 mp->ncci = ncci;
220 INIT_LIST_HEAD(&mp->ackqueue);
221 spin_lock_init(&mp->ackqlock);
222
223 skb_queue_head_init(&mp->inqueue);
224 skb_queue_head_init(&mp->outqueue);
225 spin_lock_init(&mp->outlock);
226
227 tty_port_init(&mp->port);
228 mp->port.ops = &capiminor_port_ops;
229
230 /* Allocate the least unused minor number. */
231 spin_lock(&capiminors_lock);
232 for (minor = 0; minor < capi_ttyminors; minor++)
233 if (!capiminors[minor]) {
234 capiminors[minor] = mp;
235 break;
236 }
237 spin_unlock(&capiminors_lock);
238
239 if (minor == capi_ttyminors) {
240 printk(KERN_NOTICE "capi: out of minors\n");
241 goto err_out1;
242 }
243
244 mp->minor = minor;
245
246 dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
247 NULL);
248 if (IS_ERR(dev))
249 goto err_out2;
250
251 return mp;
252
253 err_out2:
254 spin_lock(&capiminors_lock);
255 capiminors[minor] = NULL;
256 spin_unlock(&capiminors_lock);
257
258 err_out1:
259 tty_port_put(&mp->port);
260 return NULL;
261 }
262
263 static struct capiminor *capiminor_get(unsigned int minor)
264 {
265 struct capiminor *mp;
266
267 spin_lock(&capiminors_lock);
268 mp = capiminors[minor];
269 if (mp)
270 tty_port_get(&mp->port);
271 spin_unlock(&capiminors_lock);
272
273 return mp;
274 }
275
276 static inline void capiminor_put(struct capiminor *mp)
277 {
278 tty_port_put(&mp->port);
279 }
280
281 static void capiminor_free(struct capiminor *mp)
282 {
283 tty_unregister_device(capinc_tty_driver, mp->minor);
284
285 spin_lock(&capiminors_lock);
286 capiminors[mp->minor] = NULL;
287 spin_unlock(&capiminors_lock);
288
289 capiminor_put(mp);
290 }
291
292 /* -------- struct capincci ----------------------------------------- */
293
294 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
295 {
296 if (cdev->userflags & CAPIFLAG_HIGHJACKING)
297 np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
298 }
299
300 static void capincci_free_minor(struct capincci *np)
301 {
302 struct capiminor *mp = np->minorp;
303 struct tty_struct *tty;
304
305 if (mp) {
306 tty = tty_port_tty_get(&mp->port);
307 if (tty) {
308 tty_vhangup(tty);
309 tty_kref_put(tty);
310 }
311
312 capiminor_free(mp);
313 }
314 }
315
316 static inline unsigned int capincci_minor_opencount(struct capincci *np)
317 {
318 struct capiminor *mp = np->minorp;
319 unsigned int count = 0;
320 struct tty_struct *tty;
321
322 if (mp) {
323 tty = tty_port_tty_get(&mp->port);
324 if (tty) {
325 count = tty->count;
326 tty_kref_put(tty);
327 }
328 }
329 return count;
330 }
331
332 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
333
334 static inline void
335 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
336 static inline void capincci_free_minor(struct capincci *np) { }
337
338 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
339
340 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
341 {
342 struct capincci *np;
343
344 np = kzalloc(sizeof(*np), GFP_KERNEL);
345 if (!np)
346 return NULL;
347 np->ncci = ncci;
348 np->cdev = cdev;
349
350 capincci_alloc_minor(cdev, np);
351
352 list_add_tail(&np->list, &cdev->nccis);
353
354 return np;
355 }
356
357 static void capincci_free(struct capidev *cdev, u32 ncci)
358 {
359 struct capincci *np, *tmp;
360
361 list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
362 if (ncci == 0xffffffff || np->ncci == ncci) {
363 capincci_free_minor(np);
364 list_del(&np->list);
365 kfree(np);
366 }
367 }
368
369 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
370 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
371 {
372 struct capincci *np;
373
374 list_for_each_entry(np, &cdev->nccis, list)
375 if (np->ncci == ncci)
376 return np;
377 return NULL;
378 }
379
380 /* -------- handle data queue --------------------------------------- */
381
382 static struct sk_buff *
383 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
384 {
385 struct sk_buff *nskb;
386 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
387 if (nskb) {
388 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
389 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
390 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
391 capimsg_setu16(s, 2, mp->ap->applid);
392 capimsg_setu8 (s, 4, CAPI_DATA_B3);
393 capimsg_setu8 (s, 5, CAPI_RESP);
394 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
395 capimsg_setu32(s, 8, mp->ncci);
396 capimsg_setu16(s, 12, datahandle);
397 }
398 return nskb;
399 }
400
401 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
402 {
403 unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
404 struct tty_struct *tty;
405 struct sk_buff *nskb;
406 u16 errcode, datahandle;
407 struct tty_ldisc *ld;
408 int ret = -1;
409
410 tty = tty_port_tty_get(&mp->port);
411 if (!tty) {
412 pr_debug("capi: currently no receiver\n");
413 return -1;
414 }
415
416 ld = tty_ldisc_ref(tty);
417 if (!ld) {
418 /* fatal error, do not requeue */
419 ret = 0;
420 kfree_skb(skb);
421 goto deref_tty;
422 }
423
424 if (ld->ops->receive_buf == NULL) {
425 pr_debug("capi: ldisc has no receive_buf function\n");
426 /* fatal error, do not requeue */
427 goto free_skb;
428 }
429 if (mp->ttyinstop) {
430 pr_debug("capi: recv tty throttled\n");
431 goto deref_ldisc;
432 }
433
434 if (tty->receive_room < datalen) {
435 pr_debug("capi: no room in tty\n");
436 goto deref_ldisc;
437 }
438
439 nskb = gen_data_b3_resp_for(mp, skb);
440 if (!nskb) {
441 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
442 goto deref_ldisc;
443 }
444
445 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
446
447 errcode = capi20_put_message(mp->ap, nskb);
448
449 if (errcode == CAPI_NOERROR) {
450 skb_pull(skb, CAPIMSG_LEN(skb->data));
451 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
452 datahandle, skb->len);
453 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
454 } else {
455 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
456 errcode);
457 kfree_skb(nskb);
458
459 if (errcode == CAPI_SENDQUEUEFULL)
460 goto deref_ldisc;
461 }
462
463 free_skb:
464 ret = 0;
465 kfree_skb(skb);
466
467 deref_ldisc:
468 tty_ldisc_deref(ld);
469
470 deref_tty:
471 tty_kref_put(tty);
472 return ret;
473 }
474
475 static void handle_minor_recv(struct capiminor *mp)
476 {
477 struct sk_buff *skb;
478
479 while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
480 if (handle_recv_skb(mp, skb) < 0) {
481 skb_queue_head(&mp->inqueue, skb);
482 return;
483 }
484 }
485
486 static void handle_minor_send(struct capiminor *mp)
487 {
488 struct tty_struct *tty;
489 struct sk_buff *skb;
490 u16 len;
491 u16 errcode;
492 u16 datahandle;
493
494 tty = tty_port_tty_get(&mp->port);
495 if (!tty)
496 return;
497
498 if (mp->ttyoutstop) {
499 pr_debug("capi: send: tty stopped\n");
500 tty_kref_put(tty);
501 return;
502 }
503
504 while (1) {
505 spin_lock_bh(&mp->outlock);
506 skb = __skb_dequeue(&mp->outqueue);
507 if (!skb) {
508 spin_unlock_bh(&mp->outlock);
509 break;
510 }
511 len = (u16)skb->len;
512 mp->outbytes -= len;
513 spin_unlock_bh(&mp->outlock);
514
515 datahandle = atomic_inc_return(&mp->datahandle);
516 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
517 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
518 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
519 capimsg_setu16(skb->data, 2, mp->ap->applid);
520 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
521 capimsg_setu8 (skb->data, 5, CAPI_REQ);
522 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
523 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
524 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
525 capimsg_setu16(skb->data, 16, len); /* Data length */
526 capimsg_setu16(skb->data, 18, datahandle);
527 capimsg_setu16(skb->data, 20, 0); /* Flags */
528
529 if (capiminor_add_ack(mp, datahandle) < 0) {
530 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
531
532 spin_lock_bh(&mp->outlock);
533 __skb_queue_head(&mp->outqueue, skb);
534 mp->outbytes += len;
535 spin_unlock_bh(&mp->outlock);
536
537 break;
538 }
539 errcode = capi20_put_message(mp->ap, skb);
540 if (errcode == CAPI_NOERROR) {
541 pr_debug("capi: DATA_B3_REQ %u len=%u\n",
542 datahandle, len);
543 continue;
544 }
545 capiminor_del_ack(mp, datahandle);
546
547 if (errcode == CAPI_SENDQUEUEFULL) {
548 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
549
550 spin_lock_bh(&mp->outlock);
551 __skb_queue_head(&mp->outqueue, skb);
552 mp->outbytes += len;
553 spin_unlock_bh(&mp->outlock);
554
555 break;
556 }
557
558 /* ups, drop packet */
559 printk(KERN_ERR "capi: put_message = %x\n", errcode);
560 kfree_skb(skb);
561 }
562 tty_kref_put(tty);
563 }
564
565 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
566 /* -------- function called by lower level -------------------------- */
567
568 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
569 {
570 struct capidev *cdev = ap->private;
571 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
572 struct capiminor *mp;
573 u16 datahandle;
574 struct capincci *np;
575 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
576
577 mutex_lock(&cdev->lock);
578
579 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
580 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
581 if ((info & 0xff00) == 0)
582 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
583 }
584 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
585 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
586
587 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
588 skb_queue_tail(&cdev->recvqueue, skb);
589 wake_up_interruptible(&cdev->recvwait);
590 goto unlock_out;
591 }
592
593 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
594 skb_queue_tail(&cdev->recvqueue, skb);
595 wake_up_interruptible(&cdev->recvwait);
596
597 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
598
599 np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
600 if (!np) {
601 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
602 skb_queue_tail(&cdev->recvqueue, skb);
603 wake_up_interruptible(&cdev->recvwait);
604 goto unlock_out;
605 }
606
607 mp = np->minorp;
608 if (!mp) {
609 skb_queue_tail(&cdev->recvqueue, skb);
610 wake_up_interruptible(&cdev->recvwait);
611 goto unlock_out;
612 }
613 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
614 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
615 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
616 datahandle, skb->len-CAPIMSG_LEN(skb->data));
617 skb_queue_tail(&mp->inqueue, skb);
618
619 handle_minor_recv(mp);
620
621 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
622
623 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
624 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
625 datahandle,
626 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
627 kfree_skb(skb);
628 capiminor_del_ack(mp, datahandle);
629 tty_port_tty_wakeup(&mp->port);
630 handle_minor_send(mp);
631
632 } else {
633 /* ups, let capi application handle it :-) */
634 skb_queue_tail(&cdev->recvqueue, skb);
635 wake_up_interruptible(&cdev->recvwait);
636 }
637 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
638
639 unlock_out:
640 mutex_unlock(&cdev->lock);
641 }
642
643 /* -------- file_operations for capidev ----------------------------- */
644
645 static ssize_t
646 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
647 {
648 struct capidev *cdev = file->private_data;
649 struct sk_buff *skb;
650 size_t copied;
651 int err;
652
653 if (!cdev->ap.applid)
654 return -ENODEV;
655
656 skb = skb_dequeue(&cdev->recvqueue);
657 if (!skb) {
658 if (file->f_flags & O_NONBLOCK)
659 return -EAGAIN;
660 err = wait_event_interruptible(cdev->recvwait,
661 (skb = skb_dequeue(&cdev->recvqueue)));
662 if (err)
663 return err;
664 }
665 if (skb->len > count) {
666 skb_queue_head(&cdev->recvqueue, skb);
667 return -EMSGSIZE;
668 }
669 if (copy_to_user(buf, skb->data, skb->len)) {
670 skb_queue_head(&cdev->recvqueue, skb);
671 return -EFAULT;
672 }
673 copied = skb->len;
674
675 kfree_skb(skb);
676
677 return copied;
678 }
679
680 static ssize_t
681 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
682 {
683 struct capidev *cdev = file->private_data;
684 struct sk_buff *skb;
685 u16 mlen;
686
687 if (!cdev->ap.applid)
688 return -ENODEV;
689
690 skb = alloc_skb(count, GFP_USER);
691 if (!skb)
692 return -ENOMEM;
693
694 if (copy_from_user(skb_put(skb, count), buf, count)) {
695 kfree_skb(skb);
696 return -EFAULT;
697 }
698 mlen = CAPIMSG_LEN(skb->data);
699 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
700 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
701 kfree_skb(skb);
702 return -EINVAL;
703 }
704 } else {
705 if (mlen != count) {
706 kfree_skb(skb);
707 return -EINVAL;
708 }
709 }
710 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
711
712 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
713 mutex_lock(&cdev->lock);
714 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
715 mutex_unlock(&cdev->lock);
716 }
717
718 cdev->errcode = capi20_put_message(&cdev->ap, skb);
719
720 if (cdev->errcode) {
721 kfree_skb(skb);
722 return -EIO;
723 }
724 return count;
725 }
726
727 static unsigned int
728 capi_poll(struct file *file, poll_table *wait)
729 {
730 struct capidev *cdev = file->private_data;
731 unsigned int mask = 0;
732
733 if (!cdev->ap.applid)
734 return POLLERR;
735
736 poll_wait(file, &(cdev->recvwait), wait);
737 mask = POLLOUT | POLLWRNORM;
738 if (!skb_queue_empty(&cdev->recvqueue))
739 mask |= POLLIN | POLLRDNORM;
740 return mask;
741 }
742
743 static int
744 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
745 {
746 struct capidev *cdev = file->private_data;
747 capi_ioctl_struct data;
748 int retval = -EINVAL;
749 void __user *argp = (void __user *)arg;
750
751 switch (cmd) {
752 case CAPI_REGISTER:
753 mutex_lock(&cdev->lock);
754
755 if (cdev->ap.applid) {
756 retval = -EEXIST;
757 goto register_out;
758 }
759 if (copy_from_user(&cdev->ap.rparam, argp,
760 sizeof(struct capi_register_params))) {
761 retval = -EFAULT;
762 goto register_out;
763 }
764 cdev->ap.private = cdev;
765 cdev->ap.recv_message = capi_recv_message;
766 cdev->errcode = capi20_register(&cdev->ap);
767 retval = (int)cdev->ap.applid;
768 if (cdev->errcode) {
769 cdev->ap.applid = 0;
770 retval = -EIO;
771 }
772
773 register_out:
774 mutex_unlock(&cdev->lock);
775 return retval;
776
777 case CAPI_GET_VERSION:
778 if (copy_from_user(&data.contr, argp,
779 sizeof(data.contr)))
780 return -EFAULT;
781 cdev->errcode = capi20_get_version(data.contr, &data.version);
782 if (cdev->errcode)
783 return -EIO;
784 if (copy_to_user(argp, &data.version,
785 sizeof(data.version)))
786 return -EFAULT;
787 return 0;
788
789 case CAPI_GET_SERIAL:
790 if (copy_from_user(&data.contr, argp,
791 sizeof(data.contr)))
792 return -EFAULT;
793 cdev->errcode = capi20_get_serial(data.contr, data.serial);
794 if (cdev->errcode)
795 return -EIO;
796 if (copy_to_user(argp, data.serial,
797 sizeof(data.serial)))
798 return -EFAULT;
799 return 0;
800
801 case CAPI_GET_PROFILE:
802 if (copy_from_user(&data.contr, argp,
803 sizeof(data.contr)))
804 return -EFAULT;
805
806 if (data.contr == 0) {
807 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
808 if (cdev->errcode)
809 return -EIO;
810
811 retval = copy_to_user(argp,
812 &data.profile.ncontroller,
813 sizeof(data.profile.ncontroller));
814
815 } else {
816 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
817 if (cdev->errcode)
818 return -EIO;
819
820 retval = copy_to_user(argp, &data.profile,
821 sizeof(data.profile));
822 }
823 if (retval)
824 return -EFAULT;
825 return 0;
826
827 case CAPI_GET_MANUFACTURER:
828 if (copy_from_user(&data.contr, argp,
829 sizeof(data.contr)))
830 return -EFAULT;
831 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
832 if (cdev->errcode)
833 return -EIO;
834
835 if (copy_to_user(argp, data.manufacturer,
836 sizeof(data.manufacturer)))
837 return -EFAULT;
838
839 return 0;
840
841 case CAPI_GET_ERRCODE:
842 data.errcode = cdev->errcode;
843 cdev->errcode = CAPI_NOERROR;
844 if (arg) {
845 if (copy_to_user(argp, &data.errcode,
846 sizeof(data.errcode)))
847 return -EFAULT;
848 }
849 return data.errcode;
850
851 case CAPI_INSTALLED:
852 if (capi20_isinstalled() == CAPI_NOERROR)
853 return 0;
854 return -ENXIO;
855
856 case CAPI_MANUFACTURER_CMD: {
857 struct capi_manufacturer_cmd mcmd;
858 if (!capable(CAP_SYS_ADMIN))
859 return -EPERM;
860 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
861 return -EFAULT;
862 return capi20_manufacturer(mcmd.cmd, mcmd.data);
863 }
864 case CAPI_SET_FLAGS:
865 case CAPI_CLR_FLAGS: {
866 unsigned userflags;
867
868 if (copy_from_user(&userflags, argp, sizeof(userflags)))
869 return -EFAULT;
870
871 mutex_lock(&cdev->lock);
872 if (cmd == CAPI_SET_FLAGS)
873 cdev->userflags |= userflags;
874 else
875 cdev->userflags &= ~userflags;
876 mutex_unlock(&cdev->lock);
877 return 0;
878 }
879 case CAPI_GET_FLAGS:
880 if (copy_to_user(argp, &cdev->userflags,
881 sizeof(cdev->userflags)))
882 return -EFAULT;
883 return 0;
884
885 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
886 case CAPI_NCCI_OPENCOUNT:
887 return 0;
888
889 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
890 case CAPI_NCCI_OPENCOUNT: {
891 struct capincci *nccip;
892 unsigned ncci;
893 int count = 0;
894
895 if (copy_from_user(&ncci, argp, sizeof(ncci)))
896 return -EFAULT;
897
898 mutex_lock(&cdev->lock);
899 nccip = capincci_find(cdev, (u32)ncci);
900 if (nccip)
901 count = capincci_minor_opencount(nccip);
902 mutex_unlock(&cdev->lock);
903 return count;
904 }
905
906 case CAPI_NCCI_GETUNIT: {
907 struct capincci *nccip;
908 struct capiminor *mp;
909 unsigned ncci;
910 int unit = -ESRCH;
911
912 if (copy_from_user(&ncci, argp, sizeof(ncci)))
913 return -EFAULT;
914
915 mutex_lock(&cdev->lock);
916 nccip = capincci_find(cdev, (u32)ncci);
917 if (nccip) {
918 mp = nccip->minorp;
919 if (mp)
920 unit = mp->minor;
921 }
922 mutex_unlock(&cdev->lock);
923 return unit;
924 }
925 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
926
927 default:
928 return -EINVAL;
929 }
930 }
931
932 static long
933 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
934 {
935 int ret;
936
937 mutex_lock(&capi_mutex);
938 ret = capi_ioctl(file, cmd, arg);
939 mutex_unlock(&capi_mutex);
940
941 return ret;
942 }
943
944 static int capi_open(struct inode *inode, struct file *file)
945 {
946 struct capidev *cdev;
947
948 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
949 if (!cdev)
950 return -ENOMEM;
951
952 mutex_init(&cdev->lock);
953 skb_queue_head_init(&cdev->recvqueue);
954 init_waitqueue_head(&cdev->recvwait);
955 INIT_LIST_HEAD(&cdev->nccis);
956 file->private_data = cdev;
957
958 mutex_lock(&capidev_list_lock);
959 list_add_tail(&cdev->list, &capidev_list);
960 mutex_unlock(&capidev_list_lock);
961
962 return nonseekable_open(inode, file);
963 }
964
965 static int capi_release(struct inode *inode, struct file *file)
966 {
967 struct capidev *cdev = file->private_data;
968
969 mutex_lock(&capidev_list_lock);
970 list_del(&cdev->list);
971 mutex_unlock(&capidev_list_lock);
972
973 if (cdev->ap.applid)
974 capi20_release(&cdev->ap);
975 skb_queue_purge(&cdev->recvqueue);
976 capincci_free(cdev, 0xffffffff);
977
978 kfree(cdev);
979 return 0;
980 }
981
982 static const struct file_operations capi_fops =
983 {
984 .owner = THIS_MODULE,
985 .llseek = no_llseek,
986 .read = capi_read,
987 .write = capi_write,
988 .poll = capi_poll,
989 .unlocked_ioctl = capi_unlocked_ioctl,
990 .open = capi_open,
991 .release = capi_release,
992 };
993
994 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
995 /* -------- tty_operations for capincci ----------------------------- */
996
997 static int
998 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
999 {
1000 struct capiminor *mp = capiminor_get(tty->index);
1001 int ret = tty_standard_install(driver, tty);
1002
1003 if (ret == 0)
1004 tty->driver_data = mp;
1005 else
1006 capiminor_put(mp);
1007 return ret;
1008 }
1009
1010 static void capinc_tty_cleanup(struct tty_struct *tty)
1011 {
1012 struct capiminor *mp = tty->driver_data;
1013 tty->driver_data = NULL;
1014 capiminor_put(mp);
1015 }
1016
1017 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1018 {
1019 struct capiminor *mp = tty->driver_data;
1020 int err;
1021
1022 err = tty_port_open(&mp->port, tty, filp);
1023 if (err)
1024 return err;
1025
1026 handle_minor_recv(mp);
1027 return 0;
1028 }
1029
1030 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1031 {
1032 struct capiminor *mp = tty->driver_data;
1033
1034 tty_port_close(&mp->port, tty, filp);
1035 }
1036
1037 static int capinc_tty_write(struct tty_struct *tty,
1038 const unsigned char *buf, int count)
1039 {
1040 struct capiminor *mp = tty->driver_data;
1041 struct sk_buff *skb;
1042
1043 pr_debug("capinc_tty_write(count=%d)\n", count);
1044
1045 spin_lock_bh(&mp->outlock);
1046 skb = mp->outskb;
1047 if (skb) {
1048 mp->outskb = NULL;
1049 __skb_queue_tail(&mp->outqueue, skb);
1050 mp->outbytes += skb->len;
1051 }
1052
1053 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1054 if (!skb) {
1055 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1056 spin_unlock_bh(&mp->outlock);
1057 return -ENOMEM;
1058 }
1059
1060 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1061 memcpy(skb_put(skb, count), buf, count);
1062
1063 __skb_queue_tail(&mp->outqueue, skb);
1064 mp->outbytes += skb->len;
1065 spin_unlock_bh(&mp->outlock);
1066
1067 handle_minor_send(mp);
1068
1069 return count;
1070 }
1071
1072 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1073 {
1074 struct capiminor *mp = tty->driver_data;
1075 bool invoke_send = false;
1076 struct sk_buff *skb;
1077 int ret = 1;
1078
1079 pr_debug("capinc_put_char(%u)\n", ch);
1080
1081 spin_lock_bh(&mp->outlock);
1082 skb = mp->outskb;
1083 if (skb) {
1084 if (skb_tailroom(skb) > 0) {
1085 *(skb_put(skb, 1)) = ch;
1086 goto unlock_out;
1087 }
1088 mp->outskb = NULL;
1089 __skb_queue_tail(&mp->outqueue, skb);
1090 mp->outbytes += skb->len;
1091 invoke_send = true;
1092 }
1093
1094 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1095 if (skb) {
1096 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1097 *(skb_put(skb, 1)) = ch;
1098 mp->outskb = skb;
1099 } else {
1100 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1101 ret = 0;
1102 }
1103
1104 unlock_out:
1105 spin_unlock_bh(&mp->outlock);
1106
1107 if (invoke_send)
1108 handle_minor_send(mp);
1109
1110 return ret;
1111 }
1112
1113 static void capinc_tty_flush_chars(struct tty_struct *tty)
1114 {
1115 struct capiminor *mp = tty->driver_data;
1116 struct sk_buff *skb;
1117
1118 pr_debug("capinc_tty_flush_chars\n");
1119
1120 spin_lock_bh(&mp->outlock);
1121 skb = mp->outskb;
1122 if (skb) {
1123 mp->outskb = NULL;
1124 __skb_queue_tail(&mp->outqueue, skb);
1125 mp->outbytes += skb->len;
1126 spin_unlock_bh(&mp->outlock);
1127
1128 handle_minor_send(mp);
1129 } else
1130 spin_unlock_bh(&mp->outlock);
1131
1132 handle_minor_recv(mp);
1133 }
1134
1135 static int capinc_tty_write_room(struct tty_struct *tty)
1136 {
1137 struct capiminor *mp = tty->driver_data;
1138 int room;
1139
1140 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1141 room *= CAPI_MAX_BLKSIZE;
1142 pr_debug("capinc_tty_write_room = %d\n", room);
1143 return room;
1144 }
1145
1146 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1147 {
1148 struct capiminor *mp = tty->driver_data;
1149
1150 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1151 mp->outbytes, mp->nack,
1152 skb_queue_len(&mp->outqueue),
1153 skb_queue_len(&mp->inqueue));
1154 return mp->outbytes;
1155 }
1156
1157 static int capinc_tty_ioctl(struct tty_struct *tty,
1158 unsigned int cmd, unsigned long arg)
1159 {
1160 return -ENOIOCTLCMD;
1161 }
1162
1163 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1164 {
1165 pr_debug("capinc_tty_set_termios\n");
1166 }
1167
1168 static void capinc_tty_throttle(struct tty_struct *tty)
1169 {
1170 struct capiminor *mp = tty->driver_data;
1171 pr_debug("capinc_tty_throttle\n");
1172 mp->ttyinstop = 1;
1173 }
1174
1175 static void capinc_tty_unthrottle(struct tty_struct *tty)
1176 {
1177 struct capiminor *mp = tty->driver_data;
1178
1179 pr_debug("capinc_tty_unthrottle\n");
1180 mp->ttyinstop = 0;
1181 handle_minor_recv(mp);
1182 }
1183
1184 static void capinc_tty_stop(struct tty_struct *tty)
1185 {
1186 struct capiminor *mp = tty->driver_data;
1187
1188 pr_debug("capinc_tty_stop\n");
1189 mp->ttyoutstop = 1;
1190 }
1191
1192 static void capinc_tty_start(struct tty_struct *tty)
1193 {
1194 struct capiminor *mp = tty->driver_data;
1195
1196 pr_debug("capinc_tty_start\n");
1197 mp->ttyoutstop = 0;
1198 handle_minor_send(mp);
1199 }
1200
1201 static void capinc_tty_hangup(struct tty_struct *tty)
1202 {
1203 struct capiminor *mp = tty->driver_data;
1204
1205 pr_debug("capinc_tty_hangup\n");
1206 tty_port_hangup(&mp->port);
1207 }
1208
1209 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1210 {
1211 pr_debug("capinc_tty_break_ctl(%d)\n", state);
1212 return 0;
1213 }
1214
1215 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1216 {
1217 pr_debug("capinc_tty_flush_buffer\n");
1218 }
1219
1220 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1221 {
1222 pr_debug("capinc_tty_set_ldisc\n");
1223 }
1224
1225 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1226 {
1227 pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1228 }
1229
1230 static const struct tty_operations capinc_ops = {
1231 .open = capinc_tty_open,
1232 .close = capinc_tty_close,
1233 .write = capinc_tty_write,
1234 .put_char = capinc_tty_put_char,
1235 .flush_chars = capinc_tty_flush_chars,
1236 .write_room = capinc_tty_write_room,
1237 .chars_in_buffer = capinc_tty_chars_in_buffer,
1238 .ioctl = capinc_tty_ioctl,
1239 .set_termios = capinc_tty_set_termios,
1240 .throttle = capinc_tty_throttle,
1241 .unthrottle = capinc_tty_unthrottle,
1242 .stop = capinc_tty_stop,
1243 .start = capinc_tty_start,
1244 .hangup = capinc_tty_hangup,
1245 .break_ctl = capinc_tty_break_ctl,
1246 .flush_buffer = capinc_tty_flush_buffer,
1247 .set_ldisc = capinc_tty_set_ldisc,
1248 .send_xchar = capinc_tty_send_xchar,
1249 .install = capinc_tty_install,
1250 .cleanup = capinc_tty_cleanup,
1251 };
1252
1253 static int __init capinc_tty_init(void)
1254 {
1255 struct tty_driver *drv;
1256 int err;
1257
1258 if (capi_ttyminors > CAPINC_MAX_PORTS)
1259 capi_ttyminors = CAPINC_MAX_PORTS;
1260 if (capi_ttyminors <= 0)
1261 capi_ttyminors = CAPINC_NR_PORTS;
1262
1263 capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1264 GFP_KERNEL);
1265 if (!capiminors)
1266 return -ENOMEM;
1267
1268 drv = alloc_tty_driver(capi_ttyminors);
1269 if (!drv) {
1270 kfree(capiminors);
1271 return -ENOMEM;
1272 }
1273 drv->driver_name = "capi_nc";
1274 drv->name = "capi";
1275 drv->major = 0;
1276 drv->minor_start = 0;
1277 drv->type = TTY_DRIVER_TYPE_SERIAL;
1278 drv->subtype = SERIAL_TYPE_NORMAL;
1279 drv->init_termios = tty_std_termios;
1280 drv->init_termios.c_iflag = ICRNL;
1281 drv->init_termios.c_oflag = OPOST | ONLCR;
1282 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1283 drv->init_termios.c_lflag = 0;
1284 drv->flags =
1285 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1286 TTY_DRIVER_DYNAMIC_DEV;
1287 tty_set_operations(drv, &capinc_ops);
1288
1289 err = tty_register_driver(drv);
1290 if (err) {
1291 put_tty_driver(drv);
1292 kfree(capiminors);
1293 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1294 return err;
1295 }
1296 capinc_tty_driver = drv;
1297 return 0;
1298 }
1299
1300 static void __exit capinc_tty_exit(void)
1301 {
1302 tty_unregister_driver(capinc_tty_driver);
1303 put_tty_driver(capinc_tty_driver);
1304 kfree(capiminors);
1305 }
1306
1307 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1308
1309 static inline int capinc_tty_init(void)
1310 {
1311 return 0;
1312 }
1313
1314 static inline void capinc_tty_exit(void) { }
1315
1316 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1317
1318 /* -------- /proc functions ----------------------------------------- */
1319
1320 /*
1321 * /proc/capi/capi20:
1322 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1323 */
1324 static int capi20_proc_show(struct seq_file *m, void *v)
1325 {
1326 struct capidev *cdev;
1327 struct list_head *l;
1328
1329 mutex_lock(&capidev_list_lock);
1330 list_for_each(l, &capidev_list) {
1331 cdev = list_entry(l, struct capidev, list);
1332 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1333 cdev->ap.applid,
1334 cdev->ap.nrecvctlpkt,
1335 cdev->ap.nrecvdatapkt,
1336 cdev->ap.nsentctlpkt,
1337 cdev->ap.nsentdatapkt);
1338 }
1339 mutex_unlock(&capidev_list_lock);
1340 return 0;
1341 }
1342
1343 static int capi20_proc_open(struct inode *inode, struct file *file)
1344 {
1345 return single_open(file, capi20_proc_show, NULL);
1346 }
1347
1348 static const struct file_operations capi20_proc_fops = {
1349 .owner = THIS_MODULE,
1350 .open = capi20_proc_open,
1351 .read = seq_read,
1352 .llseek = seq_lseek,
1353 .release = single_release,
1354 };
1355
1356 /*
1357 * /proc/capi/capi20ncci:
1358 * applid ncci
1359 */
1360 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1361 {
1362 struct capidev *cdev;
1363 struct capincci *np;
1364
1365 mutex_lock(&capidev_list_lock);
1366 list_for_each_entry(cdev, &capidev_list, list) {
1367 mutex_lock(&cdev->lock);
1368 list_for_each_entry(np, &cdev->nccis, list)
1369 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1370 mutex_unlock(&cdev->lock);
1371 }
1372 mutex_unlock(&capidev_list_lock);
1373 return 0;
1374 }
1375
1376 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1377 {
1378 return single_open(file, capi20ncci_proc_show, NULL);
1379 }
1380
1381 static const struct file_operations capi20ncci_proc_fops = {
1382 .owner = THIS_MODULE,
1383 .open = capi20ncci_proc_open,
1384 .read = seq_read,
1385 .llseek = seq_lseek,
1386 .release = single_release,
1387 };
1388
1389 static void __init proc_init(void)
1390 {
1391 proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1392 proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1393 }
1394
1395 static void __exit proc_exit(void)
1396 {
1397 remove_proc_entry("capi/capi20", NULL);
1398 remove_proc_entry("capi/capi20ncci", NULL);
1399 }
1400
1401 /* -------- init function and module interface ---------------------- */
1402
1403
1404 static int __init capi_init(void)
1405 {
1406 const char *compileinfo;
1407 int major_ret;
1408
1409 major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1410 if (major_ret < 0) {
1411 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1412 return major_ret;
1413 }
1414 capi_class = class_create(THIS_MODULE, "capi");
1415 if (IS_ERR(capi_class)) {
1416 unregister_chrdev(capi_major, "capi20");
1417 return PTR_ERR(capi_class);
1418 }
1419
1420 device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1421
1422 if (capinc_tty_init() < 0) {
1423 device_destroy(capi_class, MKDEV(capi_major, 0));
1424 class_destroy(capi_class);
1425 unregister_chrdev(capi_major, "capi20");
1426 return -ENOMEM;
1427 }
1428
1429 proc_init();
1430
1431 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1432 compileinfo = " (middleware)";
1433 #else
1434 compileinfo = " (no middleware)";
1435 #endif
1436 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1437 capi_major, compileinfo);
1438
1439 return 0;
1440 }
1441
1442 static void __exit capi_exit(void)
1443 {
1444 proc_exit();
1445
1446 device_destroy(capi_class, MKDEV(capi_major, 0));
1447 class_destroy(capi_class);
1448 unregister_chrdev(capi_major, "capi20");
1449
1450 capinc_tty_exit();
1451 }
1452
1453 module_init(capi_init);
1454 module_exit(capi_exit);
Linus' kernel tree