*: convert stream-like files from nonseekable_open -> stream_open
[sfrench/cifs-2.6.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/compiler.h>
13 #include <linux/module.h>
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/major.h>
17 #include <linux/sched.h>
18 #include <linux/slab.h>
19 #include <linux/fcntl.h>
20 #include <linux/fs.h>
21 #include <linux/signal.h>
22 #include <linux/mutex.h>
23 #include <linux/mm.h>
24 #include <linux/timer.h>
25 #include <linux/wait.h>
26 #include <linux/tty.h>
27 #include <linux/netdevice.h>
28 #include <linux/ppp_defs.h>
29 #include <linux/ppp-ioctl.h>
30 #include <linux/skbuff.h>
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #include <linux/poll.h>
34 #include <linux/capi.h>
35 #include <linux/kernelcapi.h>
36 #include <linux/init.h>
37 #include <linux/device.h>
38 #include <linux/moduleparam.h>
39 #include <linux/isdn/capiutil.h>
40 #include <linux/isdn/capicmd.h>
41
42 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
43 MODULE_AUTHOR("Carsten Paeth");
44 MODULE_LICENSE("GPL");
45
46 /* -------- driver information -------------------------------------- */
47
48 static DEFINE_MUTEX(capi_mutex);
49 static struct class *capi_class;
50 static int capi_major = 68;             /* allocated */
51
52 module_param_named(major, capi_major, uint, 0);
53
54 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
55 #define CAPINC_NR_PORTS         32
56 #define CAPINC_MAX_PORTS        256
57
58 static int capi_ttyminors = CAPINC_NR_PORTS;
59
60 module_param_named(ttyminors, capi_ttyminors, uint, 0);
61 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
62
63 /* -------- defines ------------------------------------------------- */
64
65 #define CAPINC_MAX_RECVQUEUE    10
66 #define CAPINC_MAX_SENDQUEUE    10
67 #define CAPI_MAX_BLKSIZE        2048
68
69 /* -------- data structures ----------------------------------------- */
70
71 struct capidev;
72 struct capincci;
73 struct capiminor;
74
75 struct ackqueue_entry {
76         struct list_head        list;
77         u16                     datahandle;
78 };
79
80 struct capiminor {
81         unsigned int      minor;
82
83         struct capi20_appl      *ap;
84         u32                     ncci;
85         atomic_t                datahandle;
86         atomic_t                msgid;
87
88         struct tty_port port;
89         int                ttyinstop;
90         int                ttyoutstop;
91
92         struct sk_buff_head     inqueue;
93
94         struct sk_buff_head     outqueue;
95         int                     outbytes;
96         struct sk_buff          *outskb;
97         spinlock_t              outlock;
98
99         /* transmit path */
100         struct list_head ackqueue;
101         int nack;
102         spinlock_t ackqlock;
103 };
104
105 struct capincci {
106         struct list_head list;
107         u32              ncci;
108         struct capidev  *cdev;
109 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
110         struct capiminor *minorp;
111 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
112 };
113
114 struct capidev {
115         struct list_head list;
116         struct capi20_appl ap;
117         u16             errcode;
118         unsigned        userflags;
119
120         struct sk_buff_head recvqueue;
121         wait_queue_head_t recvwait;
122
123         struct list_head nccis;
124
125         struct mutex lock;
126 };
127
128 /* -------- global variables ---------------------------------------- */
129
130 static DEFINE_MUTEX(capidev_list_lock);
131 static LIST_HEAD(capidev_list);
132
133 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
134
135 static DEFINE_SPINLOCK(capiminors_lock);
136 static struct capiminor **capiminors;
137
138 static struct tty_driver *capinc_tty_driver;
139
140 /* -------- datahandles --------------------------------------------- */
141
142 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
143 {
144         struct ackqueue_entry *n;
145
146         n = kmalloc(sizeof(*n), GFP_ATOMIC);
147         if (unlikely(!n)) {
148                 printk(KERN_ERR "capi: alloc datahandle failed\n");
149                 return -1;
150         }
151         n->datahandle = datahandle;
152         INIT_LIST_HEAD(&n->list);
153         spin_lock_bh(&mp->ackqlock);
154         list_add_tail(&n->list, &mp->ackqueue);
155         mp->nack++;
156         spin_unlock_bh(&mp->ackqlock);
157         return 0;
158 }
159
160 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
161 {
162         struct ackqueue_entry *p, *tmp;
163
164         spin_lock_bh(&mp->ackqlock);
165         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
166                 if (p->datahandle == datahandle) {
167                         list_del(&p->list);
168                         mp->nack--;
169                         spin_unlock_bh(&mp->ackqlock);
170                         kfree(p);
171                         return 0;
172                 }
173         }
174         spin_unlock_bh(&mp->ackqlock);
175         return -1;
176 }
177
178 static void capiminor_del_all_ack(struct capiminor *mp)
179 {
180         struct ackqueue_entry *p, *tmp;
181
182         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
183                 list_del(&p->list);
184                 kfree(p);
185                 mp->nack--;
186         }
187 }
188
189
190 /* -------- struct capiminor ---------------------------------------- */
191
192 static void capiminor_destroy(struct tty_port *port)
193 {
194         struct capiminor *mp = container_of(port, struct capiminor, port);
195
196         kfree_skb(mp->outskb);
197         skb_queue_purge(&mp->inqueue);
198         skb_queue_purge(&mp->outqueue);
199         capiminor_del_all_ack(mp);
200         kfree(mp);
201 }
202
203 static const struct tty_port_operations capiminor_port_ops = {
204         .destruct = capiminor_destroy,
205 };
206
207 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
208 {
209         struct capiminor *mp;
210         struct device *dev;
211         unsigned int minor;
212
213         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
214         if (!mp) {
215                 printk(KERN_ERR "capi: can't alloc capiminor\n");
216                 return NULL;
217         }
218
219         mp->ap = ap;
220         mp->ncci = ncci;
221         INIT_LIST_HEAD(&mp->ackqueue);
222         spin_lock_init(&mp->ackqlock);
223
224         skb_queue_head_init(&mp->inqueue);
225         skb_queue_head_init(&mp->outqueue);
226         spin_lock_init(&mp->outlock);
227
228         tty_port_init(&mp->port);
229         mp->port.ops = &capiminor_port_ops;
230
231         /* Allocate the least unused minor number. */
232         spin_lock(&capiminors_lock);
233         for (minor = 0; minor < capi_ttyminors; minor++)
234                 if (!capiminors[minor]) {
235                         capiminors[minor] = mp;
236                         break;
237                 }
238         spin_unlock(&capiminors_lock);
239
240         if (minor == capi_ttyminors) {
241                 printk(KERN_NOTICE "capi: out of minors\n");
242                 goto err_out1;
243         }
244
245         mp->minor = minor;
246
247         dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
248                         NULL);
249         if (IS_ERR(dev))
250                 goto err_out2;
251
252         return mp;
253
254 err_out2:
255         spin_lock(&capiminors_lock);
256         capiminors[minor] = NULL;
257         spin_unlock(&capiminors_lock);
258
259 err_out1:
260         tty_port_put(&mp->port);
261         return NULL;
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                 tty_port_get(&mp->port);
272         spin_unlock(&capiminors_lock);
273
274         return mp;
275 }
276
277 static inline void capiminor_put(struct capiminor *mp)
278 {
279         tty_port_put(&mp->port);
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 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
340
341 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
342 {
343         struct capincci *np;
344
345         np = kzalloc(sizeof(*np), GFP_KERNEL);
346         if (!np)
347                 return NULL;
348         np->ncci = ncci;
349         np->cdev = cdev;
350
351         capincci_alloc_minor(cdev, np);
352
353         list_add_tail(&np->list, &cdev->nccis);
354
355         return np;
356 }
357
358 static void capincci_free(struct capidev *cdev, u32 ncci)
359 {
360         struct capincci *np, *tmp;
361
362         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
363                 if (ncci == 0xffffffff || np->ncci == ncci) {
364                         capincci_free_minor(np);
365                         list_del(&np->list);
366                         kfree(np);
367                 }
368 }
369
370 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
371 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
372 {
373         struct capincci *np;
374
375         list_for_each_entry(np, &cdev->nccis, list)
376                 if (np->ncci == ncci)
377                         return np;
378         return NULL;
379 }
380
381 /* -------- handle data queue --------------------------------------- */
382
383 static struct sk_buff *
384 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
385 {
386         struct sk_buff *nskb;
387         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
388         if (nskb) {
389                 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
390                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
391                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
392                 capimsg_setu16(s, 2, mp->ap->applid);
393                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
394                 capimsg_setu8 (s, 5, CAPI_RESP);
395                 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
396                 capimsg_setu32(s, 8, mp->ncci);
397                 capimsg_setu16(s, 12, datahandle);
398         }
399         return nskb;
400 }
401
402 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
403 {
404         unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
405         struct tty_struct *tty;
406         struct sk_buff *nskb;
407         u16 errcode, datahandle;
408         struct tty_ldisc *ld;
409         int ret = -1;
410
411         tty = tty_port_tty_get(&mp->port);
412         if (!tty) {
413                 pr_debug("capi: currently no receiver\n");
414                 return -1;
415         }
416
417         ld = tty_ldisc_ref(tty);
418         if (!ld) {
419                 /* fatal error, do not requeue */
420                 ret = 0;
421                 kfree_skb(skb);
422                 goto deref_tty;
423         }
424
425         if (ld->ops->receive_buf == NULL) {
426                 pr_debug("capi: ldisc has no receive_buf function\n");
427                 /* fatal error, do not requeue */
428                 goto free_skb;
429         }
430         if (mp->ttyinstop) {
431                 pr_debug("capi: recv tty throttled\n");
432                 goto deref_ldisc;
433         }
434
435         if (tty->receive_room < datalen) {
436                 pr_debug("capi: no room in tty\n");
437                 goto deref_ldisc;
438         }
439
440         nskb = gen_data_b3_resp_for(mp, skb);
441         if (!nskb) {
442                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
443                 goto deref_ldisc;
444         }
445
446         datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
447
448         errcode = capi20_put_message(mp->ap, nskb);
449
450         if (errcode == CAPI_NOERROR) {
451                 skb_pull(skb, CAPIMSG_LEN(skb->data));
452                 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
453                          datahandle, skb->len);
454                 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
455         } else {
456                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
457                        errcode);
458                 kfree_skb(nskb);
459
460                 if (errcode == CAPI_SENDQUEUEFULL)
461                         goto deref_ldisc;
462         }
463
464 free_skb:
465         ret = 0;
466         kfree_skb(skb);
467
468 deref_ldisc:
469         tty_ldisc_deref(ld);
470
471 deref_tty:
472         tty_kref_put(tty);
473         return ret;
474 }
475
476 static void handle_minor_recv(struct capiminor *mp)
477 {
478         struct sk_buff *skb;
479
480         while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
481                 if (handle_recv_skb(mp, skb) < 0) {
482                         skb_queue_head(&mp->inqueue, skb);
483                         return;
484                 }
485 }
486
487 static void handle_minor_send(struct capiminor *mp)
488 {
489         struct tty_struct *tty;
490         struct sk_buff *skb;
491         u16 len;
492         u16 errcode;
493         u16 datahandle;
494
495         tty = tty_port_tty_get(&mp->port);
496         if (!tty)
497                 return;
498
499         if (mp->ttyoutstop) {
500                 pr_debug("capi: send: tty stopped\n");
501                 tty_kref_put(tty);
502                 return;
503         }
504
505         while (1) {
506                 spin_lock_bh(&mp->outlock);
507                 skb = __skb_dequeue(&mp->outqueue);
508                 if (!skb) {
509                         spin_unlock_bh(&mp->outlock);
510                         break;
511                 }
512                 len = (u16)skb->len;
513                 mp->outbytes -= len;
514                 spin_unlock_bh(&mp->outlock);
515
516                 datahandle = atomic_inc_return(&mp->datahandle);
517                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
518                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
519                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
520                 capimsg_setu16(skb->data, 2, mp->ap->applid);
521                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
522                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
523                 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
524                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
525                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
526                 capimsg_setu16(skb->data, 16, len);     /* Data length */
527                 capimsg_setu16(skb->data, 18, datahandle);
528                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
529
530                 if (capiminor_add_ack(mp, datahandle) < 0) {
531                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
532
533                         spin_lock_bh(&mp->outlock);
534                         __skb_queue_head(&mp->outqueue, skb);
535                         mp->outbytes += len;
536                         spin_unlock_bh(&mp->outlock);
537
538                         break;
539                 }
540                 errcode = capi20_put_message(mp->ap, skb);
541                 if (errcode == CAPI_NOERROR) {
542                         pr_debug("capi: DATA_B3_REQ %u len=%u\n",
543                                  datahandle, len);
544                         continue;
545                 }
546                 capiminor_del_ack(mp, datahandle);
547
548                 if (errcode == CAPI_SENDQUEUEFULL) {
549                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
550
551                         spin_lock_bh(&mp->outlock);
552                         __skb_queue_head(&mp->outqueue, skb);
553                         mp->outbytes += len;
554                         spin_unlock_bh(&mp->outlock);
555
556                         break;
557                 }
558
559                 /* ups, drop packet */
560                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
561                 kfree_skb(skb);
562         }
563         tty_kref_put(tty);
564 }
565
566 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
567 /* -------- function called by lower level -------------------------- */
568
569 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
570 {
571         struct capidev *cdev = ap->private;
572 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
573         struct capiminor *mp;
574         u16 datahandle;
575         struct capincci *np;
576 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
577
578         mutex_lock(&cdev->lock);
579
580         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
581                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
582                 if ((info & 0xff00) == 0)
583                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
584         }
585         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
586                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
587
588         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
589                 skb_queue_tail(&cdev->recvqueue, skb);
590                 wake_up_interruptible(&cdev->recvwait);
591                 goto unlock_out;
592         }
593
594 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
595         skb_queue_tail(&cdev->recvqueue, skb);
596         wake_up_interruptible(&cdev->recvwait);
597
598 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
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         mp = np->minorp;
609         if (!mp) {
610                 skb_queue_tail(&cdev->recvqueue, skb);
611                 wake_up_interruptible(&cdev->recvwait);
612                 goto unlock_out;
613         }
614         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
615                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
616                 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
617                          datahandle, skb->len-CAPIMSG_LEN(skb->data));
618                 skb_queue_tail(&mp->inqueue, skb);
619
620                 handle_minor_recv(mp);
621
622         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
623
624                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
625                 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
626                          datahandle,
627                          CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
628                 kfree_skb(skb);
629                 capiminor_del_ack(mp, datahandle);
630                 tty_port_tty_wakeup(&mp->port);
631                 handle_minor_send(mp);
632
633         } else {
634                 /* ups, let capi application handle it :-) */
635                 skb_queue_tail(&cdev->recvqueue, skb);
636                 wake_up_interruptible(&cdev->recvwait);
637         }
638 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
639
640 unlock_out:
641         mutex_unlock(&cdev->lock);
642 }
643
644 /* -------- file_operations for capidev ----------------------------- */
645
646 static ssize_t
647 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
648 {
649         struct capidev *cdev = file->private_data;
650         struct sk_buff *skb;
651         size_t copied;
652         int err;
653
654         if (!cdev->ap.applid)
655                 return -ENODEV;
656
657         skb = skb_dequeue(&cdev->recvqueue);
658         if (!skb) {
659                 if (file->f_flags & O_NONBLOCK)
660                         return -EAGAIN;
661                 err = wait_event_interruptible(cdev->recvwait,
662                                                (skb = skb_dequeue(&cdev->recvqueue)));
663                 if (err)
664                         return err;
665         }
666         if (skb->len > count) {
667                 skb_queue_head(&cdev->recvqueue, skb);
668                 return -EMSGSIZE;
669         }
670         if (copy_to_user(buf, skb->data, skb->len)) {
671                 skb_queue_head(&cdev->recvqueue, skb);
672                 return -EFAULT;
673         }
674         copied = skb->len;
675
676         kfree_skb(skb);
677
678         return copied;
679 }
680
681 static ssize_t
682 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
683 {
684         struct capidev *cdev = file->private_data;
685         struct sk_buff *skb;
686         u16 mlen;
687
688         if (!cdev->ap.applid)
689                 return -ENODEV;
690
691         skb = alloc_skb(count, GFP_USER);
692         if (!skb)
693                 return -ENOMEM;
694
695         if (copy_from_user(skb_put(skb, count), buf, count)) {
696                 kfree_skb(skb);
697                 return -EFAULT;
698         }
699         mlen = CAPIMSG_LEN(skb->data);
700         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
701                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
702                         kfree_skb(skb);
703                         return -EINVAL;
704                 }
705         } else {
706                 if (mlen != count) {
707                         kfree_skb(skb);
708                         return -EINVAL;
709                 }
710         }
711         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
712
713         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
714                 mutex_lock(&cdev->lock);
715                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
716                 mutex_unlock(&cdev->lock);
717         }
718
719         cdev->errcode = capi20_put_message(&cdev->ap, skb);
720
721         if (cdev->errcode) {
722                 kfree_skb(skb);
723                 return -EIO;
724         }
725         return count;
726 }
727
728 static __poll_t
729 capi_poll(struct file *file, poll_table *wait)
730 {
731         struct capidev *cdev = file->private_data;
732         __poll_t mask = 0;
733
734         if (!cdev->ap.applid)
735                 return EPOLLERR;
736
737         poll_wait(file, &(cdev->recvwait), wait);
738         mask = EPOLLOUT | EPOLLWRNORM;
739         if (!skb_queue_empty(&cdev->recvqueue))
740                 mask |= EPOLLIN | EPOLLRDNORM;
741         return mask;
742 }
743
744 static int
745 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
746 {
747         struct capidev *cdev = file->private_data;
748         capi_ioctl_struct data;
749         int retval = -EINVAL;
750         void __user *argp = (void __user *)arg;
751
752         switch (cmd) {
753         case CAPI_REGISTER:
754                 mutex_lock(&cdev->lock);
755
756                 if (cdev->ap.applid) {
757                         retval = -EEXIST;
758                         goto register_out;
759                 }
760                 if (copy_from_user(&cdev->ap.rparam, argp,
761                                    sizeof(struct capi_register_params))) {
762                         retval = -EFAULT;
763                         goto register_out;
764                 }
765                 cdev->ap.private = cdev;
766                 cdev->ap.recv_message = capi_recv_message;
767                 cdev->errcode = capi20_register(&cdev->ap);
768                 retval = (int)cdev->ap.applid;
769                 if (cdev->errcode) {
770                         cdev->ap.applid = 0;
771                         retval = -EIO;
772                 }
773
774 register_out:
775                 mutex_unlock(&cdev->lock);
776                 return retval;
777
778         case CAPI_GET_VERSION:
779                 if (copy_from_user(&data.contr, argp,
780                                    sizeof(data.contr)))
781                         return -EFAULT;
782                 cdev->errcode = capi20_get_version(data.contr, &data.version);
783                 if (cdev->errcode)
784                         return -EIO;
785                 if (copy_to_user(argp, &data.version,
786                                  sizeof(data.version)))
787                         return -EFAULT;
788                 return 0;
789
790         case CAPI_GET_SERIAL:
791                 if (copy_from_user(&data.contr, argp,
792                                    sizeof(data.contr)))
793                         return -EFAULT;
794                 cdev->errcode = capi20_get_serial(data.contr, data.serial);
795                 if (cdev->errcode)
796                         return -EIO;
797                 if (copy_to_user(argp, data.serial,
798                                  sizeof(data.serial)))
799                         return -EFAULT;
800                 return 0;
801
802         case CAPI_GET_PROFILE:
803                 if (copy_from_user(&data.contr, argp,
804                                    sizeof(data.contr)))
805                         return -EFAULT;
806
807                 if (data.contr == 0) {
808                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
809                         if (cdev->errcode)
810                                 return -EIO;
811
812                         retval = copy_to_user(argp,
813                                               &data.profile.ncontroller,
814                                               sizeof(data.profile.ncontroller));
815
816                 } else {
817                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
818                         if (cdev->errcode)
819                                 return -EIO;
820
821                         retval = copy_to_user(argp, &data.profile,
822                                               sizeof(data.profile));
823                 }
824                 if (retval)
825                         return -EFAULT;
826                 return 0;
827
828         case CAPI_GET_MANUFACTURER:
829                 if (copy_from_user(&data.contr, argp,
830                                    sizeof(data.contr)))
831                         return -EFAULT;
832                 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
833                 if (cdev->errcode)
834                         return -EIO;
835
836                 if (copy_to_user(argp, data.manufacturer,
837                                  sizeof(data.manufacturer)))
838                         return -EFAULT;
839
840                 return 0;
841
842         case CAPI_GET_ERRCODE:
843                 data.errcode = cdev->errcode;
844                 cdev->errcode = CAPI_NOERROR;
845                 if (arg) {
846                         if (copy_to_user(argp, &data.errcode,
847                                          sizeof(data.errcode)))
848                                 return -EFAULT;
849                 }
850                 return data.errcode;
851
852         case CAPI_INSTALLED:
853                 if (capi20_isinstalled() == CAPI_NOERROR)
854                         return 0;
855                 return -ENXIO;
856
857         case CAPI_MANUFACTURER_CMD: {
858                 struct capi_manufacturer_cmd mcmd;
859                 if (!capable(CAP_SYS_ADMIN))
860                         return -EPERM;
861                 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
862                         return -EFAULT;
863                 return capi20_manufacturer(mcmd.cmd, mcmd.data);
864         }
865         case CAPI_SET_FLAGS:
866         case CAPI_CLR_FLAGS: {
867                 unsigned userflags;
868
869                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
870                         return -EFAULT;
871
872                 mutex_lock(&cdev->lock);
873                 if (cmd == CAPI_SET_FLAGS)
874                         cdev->userflags |= userflags;
875                 else
876                         cdev->userflags &= ~userflags;
877                 mutex_unlock(&cdev->lock);
878                 return 0;
879         }
880         case CAPI_GET_FLAGS:
881                 if (copy_to_user(argp, &cdev->userflags,
882                                  sizeof(cdev->userflags)))
883                         return -EFAULT;
884                 return 0;
885
886 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
887         case CAPI_NCCI_OPENCOUNT:
888                 return 0;
889
890 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
891         case CAPI_NCCI_OPENCOUNT: {
892                 struct capincci *nccip;
893                 unsigned ncci;
894                 int count = 0;
895
896                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
897                         return -EFAULT;
898
899                 mutex_lock(&cdev->lock);
900                 nccip = capincci_find(cdev, (u32)ncci);
901                 if (nccip)
902                         count = capincci_minor_opencount(nccip);
903                 mutex_unlock(&cdev->lock);
904                 return count;
905         }
906
907         case CAPI_NCCI_GETUNIT: {
908                 struct capincci *nccip;
909                 struct capiminor *mp;
910                 unsigned ncci;
911                 int unit = -ESRCH;
912
913                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
914                         return -EFAULT;
915
916                 mutex_lock(&cdev->lock);
917                 nccip = capincci_find(cdev, (u32)ncci);
918                 if (nccip) {
919                         mp = nccip->minorp;
920                         if (mp)
921                                 unit = mp->minor;
922                 }
923                 mutex_unlock(&cdev->lock);
924                 return unit;
925         }
926 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
927
928         default:
929                 return -EINVAL;
930         }
931 }
932
933 static long
934 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
935 {
936         int ret;
937
938         mutex_lock(&capi_mutex);
939         ret = capi_ioctl(file, cmd, arg);
940         mutex_unlock(&capi_mutex);
941
942         return ret;
943 }
944
945 static int capi_open(struct inode *inode, struct file *file)
946 {
947         struct capidev *cdev;
948
949         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
950         if (!cdev)
951                 return -ENOMEM;
952
953         mutex_init(&cdev->lock);
954         skb_queue_head_init(&cdev->recvqueue);
955         init_waitqueue_head(&cdev->recvwait);
956         INIT_LIST_HEAD(&cdev->nccis);
957         file->private_data = cdev;
958
959         mutex_lock(&capidev_list_lock);
960         list_add_tail(&cdev->list, &capidev_list);
961         mutex_unlock(&capidev_list_lock);
962
963         return stream_open(inode, file);
964 }
965
966 static int capi_release(struct inode *inode, struct file *file)
967 {
968         struct capidev *cdev = file->private_data;
969
970         mutex_lock(&capidev_list_lock);
971         list_del(&cdev->list);
972         mutex_unlock(&capidev_list_lock);
973
974         if (cdev->ap.applid)
975                 capi20_release(&cdev->ap);
976         skb_queue_purge(&cdev->recvqueue);
977         capincci_free(cdev, 0xffffffff);
978
979         kfree(cdev);
980         return 0;
981 }
982
983 static const struct file_operations capi_fops =
984 {
985         .owner          = THIS_MODULE,
986         .llseek         = no_llseek,
987         .read           = capi_read,
988         .write          = capi_write,
989         .poll           = capi_poll,
990         .unlocked_ioctl = capi_unlocked_ioctl,
991         .open           = capi_open,
992         .release        = capi_release,
993 };
994
995 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
996 /* -------- tty_operations for capincci ----------------------------- */
997
998 static int
999 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1000 {
1001         struct capiminor *mp = capiminor_get(tty->index);
1002         int ret = tty_standard_install(driver, tty);
1003
1004         if (ret == 0)
1005                 tty->driver_data = mp;
1006         else
1007                 capiminor_put(mp);
1008         return ret;
1009 }
1010
1011 static void capinc_tty_cleanup(struct tty_struct *tty)
1012 {
1013         struct capiminor *mp = tty->driver_data;
1014         tty->driver_data = NULL;
1015         capiminor_put(mp);
1016 }
1017
1018 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1019 {
1020         struct capiminor *mp = tty->driver_data;
1021         int err;
1022
1023         err = tty_port_open(&mp->port, tty, filp);
1024         if (err)
1025                 return err;
1026
1027         handle_minor_recv(mp);
1028         return 0;
1029 }
1030
1031 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1032 {
1033         struct capiminor *mp = tty->driver_data;
1034
1035         tty_port_close(&mp->port, tty, filp);
1036 }
1037
1038 static int capinc_tty_write(struct tty_struct *tty,
1039                             const unsigned char *buf, int count)
1040 {
1041         struct capiminor *mp = tty->driver_data;
1042         struct sk_buff *skb;
1043
1044         pr_debug("capinc_tty_write(count=%d)\n", count);
1045
1046         spin_lock_bh(&mp->outlock);
1047         skb = mp->outskb;
1048         if (skb) {
1049                 mp->outskb = NULL;
1050                 __skb_queue_tail(&mp->outqueue, skb);
1051                 mp->outbytes += skb->len;
1052         }
1053
1054         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1055         if (!skb) {
1056                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1057                 spin_unlock_bh(&mp->outlock);
1058                 return -ENOMEM;
1059         }
1060
1061         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1062         skb_put_data(skb, buf, count);
1063
1064         __skb_queue_tail(&mp->outqueue, skb);
1065         mp->outbytes += skb->len;
1066         spin_unlock_bh(&mp->outlock);
1067
1068         handle_minor_send(mp);
1069
1070         return count;
1071 }
1072
1073 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1074 {
1075         struct capiminor *mp = tty->driver_data;
1076         bool invoke_send = false;
1077         struct sk_buff *skb;
1078         int ret = 1;
1079
1080         pr_debug("capinc_put_char(%u)\n", ch);
1081
1082         spin_lock_bh(&mp->outlock);
1083         skb = mp->outskb;
1084         if (skb) {
1085                 if (skb_tailroom(skb) > 0) {
1086                         skb_put_u8(skb, ch);
1087                         goto unlock_out;
1088                 }
1089                 mp->outskb = NULL;
1090                 __skb_queue_tail(&mp->outqueue, skb);
1091                 mp->outbytes += skb->len;
1092                 invoke_send = true;
1093         }
1094
1095         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1096         if (skb) {
1097                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1098                 skb_put_u8(skb, ch);
1099                 mp->outskb = skb;
1100         } else {
1101                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1102                 ret = 0;
1103         }
1104
1105 unlock_out:
1106         spin_unlock_bh(&mp->outlock);
1107
1108         if (invoke_send)
1109                 handle_minor_send(mp);
1110
1111         return ret;
1112 }
1113
1114 static void capinc_tty_flush_chars(struct tty_struct *tty)
1115 {
1116         struct capiminor *mp = tty->driver_data;
1117         struct sk_buff *skb;
1118
1119         pr_debug("capinc_tty_flush_chars\n");
1120
1121         spin_lock_bh(&mp->outlock);
1122         skb = mp->outskb;
1123         if (skb) {
1124                 mp->outskb = NULL;
1125                 __skb_queue_tail(&mp->outqueue, skb);
1126                 mp->outbytes += skb->len;
1127                 spin_unlock_bh(&mp->outlock);
1128
1129                 handle_minor_send(mp);
1130         } else
1131                 spin_unlock_bh(&mp->outlock);
1132
1133         handle_minor_recv(mp);
1134 }
1135
1136 static int capinc_tty_write_room(struct tty_struct *tty)
1137 {
1138         struct capiminor *mp = tty->driver_data;
1139         int room;
1140
1141         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1142         room *= CAPI_MAX_BLKSIZE;
1143         pr_debug("capinc_tty_write_room = %d\n", room);
1144         return room;
1145 }
1146
1147 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1148 {
1149         struct capiminor *mp = tty->driver_data;
1150
1151         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1152                  mp->outbytes, mp->nack,
1153                  skb_queue_len(&mp->outqueue),
1154                  skb_queue_len(&mp->inqueue));
1155         return mp->outbytes;
1156 }
1157
1158 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1159 {
1160         pr_debug("capinc_tty_set_termios\n");
1161 }
1162
1163 static void capinc_tty_throttle(struct tty_struct *tty)
1164 {
1165         struct capiminor *mp = tty->driver_data;
1166         pr_debug("capinc_tty_throttle\n");
1167         mp->ttyinstop = 1;
1168 }
1169
1170 static void capinc_tty_unthrottle(struct tty_struct *tty)
1171 {
1172         struct capiminor *mp = tty->driver_data;
1173
1174         pr_debug("capinc_tty_unthrottle\n");
1175         mp->ttyinstop = 0;
1176         handle_minor_recv(mp);
1177 }
1178
1179 static void capinc_tty_stop(struct tty_struct *tty)
1180 {
1181         struct capiminor *mp = tty->driver_data;
1182
1183         pr_debug("capinc_tty_stop\n");
1184         mp->ttyoutstop = 1;
1185 }
1186
1187 static void capinc_tty_start(struct tty_struct *tty)
1188 {
1189         struct capiminor *mp = tty->driver_data;
1190
1191         pr_debug("capinc_tty_start\n");
1192         mp->ttyoutstop = 0;
1193         handle_minor_send(mp);
1194 }
1195
1196 static void capinc_tty_hangup(struct tty_struct *tty)
1197 {
1198         struct capiminor *mp = tty->driver_data;
1199
1200         pr_debug("capinc_tty_hangup\n");
1201         tty_port_hangup(&mp->port);
1202 }
1203
1204 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1205 {
1206         pr_debug("capinc_tty_break_ctl(%d)\n", state);
1207         return 0;
1208 }
1209
1210 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1211 {
1212         pr_debug("capinc_tty_flush_buffer\n");
1213 }
1214
1215 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1216 {
1217         pr_debug("capinc_tty_set_ldisc\n");
1218 }
1219
1220 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1221 {
1222         pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1223 }
1224
1225 static const struct tty_operations capinc_ops = {
1226         .open = capinc_tty_open,
1227         .close = capinc_tty_close,
1228         .write = capinc_tty_write,
1229         .put_char = capinc_tty_put_char,
1230         .flush_chars = capinc_tty_flush_chars,
1231         .write_room = capinc_tty_write_room,
1232         .chars_in_buffer = capinc_tty_chars_in_buffer,
1233         .set_termios = capinc_tty_set_termios,
1234         .throttle = capinc_tty_throttle,
1235         .unthrottle = capinc_tty_unthrottle,
1236         .stop = capinc_tty_stop,
1237         .start = capinc_tty_start,
1238         .hangup = capinc_tty_hangup,
1239         .break_ctl = capinc_tty_break_ctl,
1240         .flush_buffer = capinc_tty_flush_buffer,
1241         .set_ldisc = capinc_tty_set_ldisc,
1242         .send_xchar = capinc_tty_send_xchar,
1243         .install = capinc_tty_install,
1244         .cleanup = capinc_tty_cleanup,
1245 };
1246
1247 static int __init capinc_tty_init(void)
1248 {
1249         struct tty_driver *drv;
1250         int err;
1251
1252         if (capi_ttyminors > CAPINC_MAX_PORTS)
1253                 capi_ttyminors = CAPINC_MAX_PORTS;
1254         if (capi_ttyminors <= 0)
1255                 capi_ttyminors = CAPINC_NR_PORTS;
1256
1257         capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1258                              GFP_KERNEL);
1259         if (!capiminors)
1260                 return -ENOMEM;
1261
1262         drv = alloc_tty_driver(capi_ttyminors);
1263         if (!drv) {
1264                 kfree(capiminors);
1265                 return -ENOMEM;
1266         }
1267         drv->driver_name = "capi_nc";
1268         drv->name = "capi!";
1269         drv->major = 0;
1270         drv->minor_start = 0;
1271         drv->type = TTY_DRIVER_TYPE_SERIAL;
1272         drv->subtype = SERIAL_TYPE_NORMAL;
1273         drv->init_termios = tty_std_termios;
1274         drv->init_termios.c_iflag = ICRNL;
1275         drv->init_termios.c_oflag = OPOST | ONLCR;
1276         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1277         drv->init_termios.c_lflag = 0;
1278         drv->flags =
1279                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1280                 TTY_DRIVER_DYNAMIC_DEV;
1281         tty_set_operations(drv, &capinc_ops);
1282
1283         err = tty_register_driver(drv);
1284         if (err) {
1285                 put_tty_driver(drv);
1286                 kfree(capiminors);
1287                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1288                 return err;
1289         }
1290         capinc_tty_driver = drv;
1291         return 0;
1292 }
1293
1294 static void __exit capinc_tty_exit(void)
1295 {
1296         tty_unregister_driver(capinc_tty_driver);
1297         put_tty_driver(capinc_tty_driver);
1298         kfree(capiminors);
1299 }
1300
1301 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1302
1303 static inline int capinc_tty_init(void)
1304 {
1305         return 0;
1306 }
1307
1308 static inline void capinc_tty_exit(void) { }
1309
1310 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1311
1312 /* -------- /proc functions ----------------------------------------- */
1313
1314 /*
1315  * /proc/capi/capi20:
1316  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1317  */
1318 static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1319 {
1320         struct capidev *cdev;
1321         struct list_head *l;
1322
1323         mutex_lock(&capidev_list_lock);
1324         list_for_each(l, &capidev_list) {
1325                 cdev = list_entry(l, struct capidev, list);
1326                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1327                            cdev->ap.applid,
1328                            cdev->ap.nrecvctlpkt,
1329                            cdev->ap.nrecvdatapkt,
1330                            cdev->ap.nsentctlpkt,
1331                            cdev->ap.nsentdatapkt);
1332         }
1333         mutex_unlock(&capidev_list_lock);
1334         return 0;
1335 }
1336
1337 /*
1338  * /proc/capi/capi20ncci:
1339  *  applid ncci
1340  */
1341 static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1342 {
1343         struct capidev *cdev;
1344         struct capincci *np;
1345
1346         mutex_lock(&capidev_list_lock);
1347         list_for_each_entry(cdev, &capidev_list, list) {
1348                 mutex_lock(&cdev->lock);
1349                 list_for_each_entry(np, &cdev->nccis, list)
1350                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1351                 mutex_unlock(&cdev->lock);
1352         }
1353         mutex_unlock(&capidev_list_lock);
1354         return 0;
1355 }
1356
1357 static void __init proc_init(void)
1358 {
1359         proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1360         proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1361 }
1362
1363 static void __exit proc_exit(void)
1364 {
1365         remove_proc_entry("capi/capi20", NULL);
1366         remove_proc_entry("capi/capi20ncci", NULL);
1367 }
1368
1369 /* -------- init function and module interface ---------------------- */
1370
1371
1372 static int __init capi_init(void)
1373 {
1374         const char *compileinfo;
1375         int major_ret;
1376
1377         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1378         if (major_ret < 0) {
1379                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1380                 return major_ret;
1381         }
1382         capi_class = class_create(THIS_MODULE, "capi");
1383         if (IS_ERR(capi_class)) {
1384                 unregister_chrdev(capi_major, "capi20");
1385                 return PTR_ERR(capi_class);
1386         }
1387
1388         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1389
1390         if (capinc_tty_init() < 0) {
1391                 device_destroy(capi_class, MKDEV(capi_major, 0));
1392                 class_destroy(capi_class);
1393                 unregister_chrdev(capi_major, "capi20");
1394                 return -ENOMEM;
1395         }
1396
1397         proc_init();
1398
1399 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1400         compileinfo = " (middleware)";
1401 #else
1402         compileinfo = " (no middleware)";
1403 #endif
1404         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1405                capi_major, compileinfo);
1406
1407         return 0;
1408 }
1409
1410 static void __exit capi_exit(void)
1411 {
1412         proc_exit();
1413
1414         device_destroy(capi_class, MKDEV(capi_major, 0));
1415         class_destroy(capi_class);
1416         unregister_chrdev(capi_major, "capi20");
1417
1418         capinc_tty_exit();
1419 }
1420
1421 module_init(capi_init);
1422 module_exit(capi_exit);