Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
[linux-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/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         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         struct capiminor *mp = capiminor_get(tty->index);
1017         int ret = tty_standard_install(driver, tty);
1018
1019         if (ret == 0)
1020                 tty->driver_data = mp;
1021         else
1022                 capiminor_put(mp);
1023         return ret;
1024 }
1025
1026 static void capinc_tty_cleanup(struct tty_struct *tty)
1027 {
1028         struct capiminor *mp = tty->driver_data;
1029         tty->driver_data = NULL;
1030         capiminor_put(mp);
1031 }
1032
1033 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1034 {
1035         struct capiminor *mp = tty->driver_data;
1036         int err;
1037
1038         err = tty_port_open(&mp->port, tty, filp);
1039         if (err)
1040                 return err;
1041
1042         handle_minor_recv(mp);
1043         return 0;
1044 }
1045
1046 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1047 {
1048         struct capiminor *mp = tty->driver_data;
1049
1050         tty_port_close(&mp->port, tty, filp);
1051 }
1052
1053 static int capinc_tty_write(struct tty_struct *tty,
1054                             const unsigned char *buf, int count)
1055 {
1056         struct capiminor *mp = tty->driver_data;
1057         struct sk_buff *skb;
1058
1059         pr_debug("capinc_tty_write(count=%d)\n", count);
1060
1061         spin_lock_bh(&mp->outlock);
1062         skb = mp->outskb;
1063         if (skb) {
1064                 mp->outskb = NULL;
1065                 __skb_queue_tail(&mp->outqueue, skb);
1066                 mp->outbytes += skb->len;
1067         }
1068
1069         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1070         if (!skb) {
1071                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1072                 spin_unlock_bh(&mp->outlock);
1073                 return -ENOMEM;
1074         }
1075
1076         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1077         memcpy(skb_put(skb, count), buf, count);
1078
1079         __skb_queue_tail(&mp->outqueue, skb);
1080         mp->outbytes += skb->len;
1081         spin_unlock_bh(&mp->outlock);
1082
1083         handle_minor_send(mp);
1084
1085         return count;
1086 }
1087
1088 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1089 {
1090         struct capiminor *mp = tty->driver_data;
1091         bool invoke_send = false;
1092         struct sk_buff *skb;
1093         int ret = 1;
1094
1095         pr_debug("capinc_put_char(%u)\n", ch);
1096
1097         spin_lock_bh(&mp->outlock);
1098         skb = mp->outskb;
1099         if (skb) {
1100                 if (skb_tailroom(skb) > 0) {
1101                         *(skb_put(skb, 1)) = ch;
1102                         goto unlock_out;
1103                 }
1104                 mp->outskb = NULL;
1105                 __skb_queue_tail(&mp->outqueue, skb);
1106                 mp->outbytes += skb->len;
1107                 invoke_send = true;
1108         }
1109
1110         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1111         if (skb) {
1112                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1113                 *(skb_put(skb, 1)) = ch;
1114                 mp->outskb = skb;
1115         } else {
1116                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1117                 ret = 0;
1118         }
1119
1120 unlock_out:
1121         spin_unlock_bh(&mp->outlock);
1122
1123         if (invoke_send)
1124                 handle_minor_send(mp);
1125
1126         return ret;
1127 }
1128
1129 static void capinc_tty_flush_chars(struct tty_struct *tty)
1130 {
1131         struct capiminor *mp = tty->driver_data;
1132         struct sk_buff *skb;
1133
1134         pr_debug("capinc_tty_flush_chars\n");
1135
1136         spin_lock_bh(&mp->outlock);
1137         skb = mp->outskb;
1138         if (skb) {
1139                 mp->outskb = NULL;
1140                 __skb_queue_tail(&mp->outqueue, skb);
1141                 mp->outbytes += skb->len;
1142                 spin_unlock_bh(&mp->outlock);
1143
1144                 handle_minor_send(mp);
1145         } else
1146                 spin_unlock_bh(&mp->outlock);
1147
1148         handle_minor_recv(mp);
1149 }
1150
1151 static int capinc_tty_write_room(struct tty_struct *tty)
1152 {
1153         struct capiminor *mp = tty->driver_data;
1154         int room;
1155
1156         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1157         room *= CAPI_MAX_BLKSIZE;
1158         pr_debug("capinc_tty_write_room = %d\n", room);
1159         return room;
1160 }
1161
1162 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1163 {
1164         struct capiminor *mp = tty->driver_data;
1165
1166         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1167                  mp->outbytes, mp->nack,
1168                  skb_queue_len(&mp->outqueue),
1169                  skb_queue_len(&mp->inqueue));
1170         return mp->outbytes;
1171 }
1172
1173 static int capinc_tty_ioctl(struct tty_struct *tty,
1174                             unsigned int cmd, unsigned long arg)
1175 {
1176         return -ENOIOCTLCMD;
1177 }
1178
1179 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1180 {
1181         pr_debug("capinc_tty_set_termios\n");
1182 }
1183
1184 static void capinc_tty_throttle(struct tty_struct *tty)
1185 {
1186         struct capiminor *mp = tty->driver_data;
1187         pr_debug("capinc_tty_throttle\n");
1188         mp->ttyinstop = 1;
1189 }
1190
1191 static void capinc_tty_unthrottle(struct tty_struct *tty)
1192 {
1193         struct capiminor *mp = tty->driver_data;
1194
1195         pr_debug("capinc_tty_unthrottle\n");
1196         mp->ttyinstop = 0;
1197         handle_minor_recv(mp);
1198 }
1199
1200 static void capinc_tty_stop(struct tty_struct *tty)
1201 {
1202         struct capiminor *mp = tty->driver_data;
1203
1204         pr_debug("capinc_tty_stop\n");
1205         mp->ttyoutstop = 1;
1206 }
1207
1208 static void capinc_tty_start(struct tty_struct *tty)
1209 {
1210         struct capiminor *mp = tty->driver_data;
1211
1212         pr_debug("capinc_tty_start\n");
1213         mp->ttyoutstop = 0;
1214         handle_minor_send(mp);
1215 }
1216
1217 static void capinc_tty_hangup(struct tty_struct *tty)
1218 {
1219         struct capiminor *mp = tty->driver_data;
1220
1221         pr_debug("capinc_tty_hangup\n");
1222         tty_port_hangup(&mp->port);
1223 }
1224
1225 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1226 {
1227         pr_debug("capinc_tty_break_ctl(%d)\n", state);
1228         return 0;
1229 }
1230
1231 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1232 {
1233         pr_debug("capinc_tty_flush_buffer\n");
1234 }
1235
1236 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1237 {
1238         pr_debug("capinc_tty_set_ldisc\n");
1239 }
1240
1241 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1242 {
1243         pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1244 }
1245
1246 static const struct tty_operations capinc_ops = {
1247         .open = capinc_tty_open,
1248         .close = capinc_tty_close,
1249         .write = capinc_tty_write,
1250         .put_char = capinc_tty_put_char,
1251         .flush_chars = capinc_tty_flush_chars,
1252         .write_room = capinc_tty_write_room,
1253         .chars_in_buffer = capinc_tty_chars_in_buffer,
1254         .ioctl = capinc_tty_ioctl,
1255         .set_termios = capinc_tty_set_termios,
1256         .throttle = capinc_tty_throttle,
1257         .unthrottle = capinc_tty_unthrottle,
1258         .stop = capinc_tty_stop,
1259         .start = capinc_tty_start,
1260         .hangup = capinc_tty_hangup,
1261         .break_ctl = capinc_tty_break_ctl,
1262         .flush_buffer = capinc_tty_flush_buffer,
1263         .set_ldisc = capinc_tty_set_ldisc,
1264         .send_xchar = capinc_tty_send_xchar,
1265         .install = capinc_tty_install,
1266         .cleanup = capinc_tty_cleanup,
1267 };
1268
1269 static int __init capinc_tty_init(void)
1270 {
1271         struct tty_driver *drv;
1272         int err;
1273
1274         if (capi_ttyminors > CAPINC_MAX_PORTS)
1275                 capi_ttyminors = CAPINC_MAX_PORTS;
1276         if (capi_ttyminors <= 0)
1277                 capi_ttyminors = CAPINC_NR_PORTS;
1278
1279         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1280                              GFP_KERNEL);
1281         if (!capiminors)
1282                 return -ENOMEM;
1283
1284         drv = alloc_tty_driver(capi_ttyminors);
1285         if (!drv) {
1286                 kfree(capiminors);
1287                 return -ENOMEM;
1288         }
1289         drv->driver_name = "capi_nc";
1290         drv->name = "capi";
1291         drv->major = 0;
1292         drv->minor_start = 0;
1293         drv->type = TTY_DRIVER_TYPE_SERIAL;
1294         drv->subtype = SERIAL_TYPE_NORMAL;
1295         drv->init_termios = tty_std_termios;
1296         drv->init_termios.c_iflag = ICRNL;
1297         drv->init_termios.c_oflag = OPOST | ONLCR;
1298         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1299         drv->init_termios.c_lflag = 0;
1300         drv->flags =
1301                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1302                 TTY_DRIVER_DYNAMIC_DEV;
1303         tty_set_operations(drv, &capinc_ops);
1304
1305         err = tty_register_driver(drv);
1306         if (err) {
1307                 put_tty_driver(drv);
1308                 kfree(capiminors);
1309                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1310                 return err;
1311         }
1312         capinc_tty_driver = drv;
1313         return 0;
1314 }
1315
1316 static void __exit capinc_tty_exit(void)
1317 {
1318         tty_unregister_driver(capinc_tty_driver);
1319         put_tty_driver(capinc_tty_driver);
1320         kfree(capiminors);
1321 }
1322
1323 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1324
1325 static inline int capinc_tty_init(void)
1326 {
1327         return 0;
1328 }
1329
1330 static inline void capinc_tty_exit(void) { }
1331
1332 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1333
1334 /* -------- /proc functions ----------------------------------------- */
1335
1336 /*
1337  * /proc/capi/capi20:
1338  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1339  */
1340 static int capi20_proc_show(struct seq_file *m, void *v)
1341 {
1342         struct capidev *cdev;
1343         struct list_head *l;
1344
1345         mutex_lock(&capidev_list_lock);
1346         list_for_each(l, &capidev_list) {
1347                 cdev = list_entry(l, struct capidev, list);
1348                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1349                            cdev->ap.applid,
1350                            cdev->ap.nrecvctlpkt,
1351                            cdev->ap.nrecvdatapkt,
1352                            cdev->ap.nsentctlpkt,
1353                            cdev->ap.nsentdatapkt);
1354         }
1355         mutex_unlock(&capidev_list_lock);
1356         return 0;
1357 }
1358
1359 static int capi20_proc_open(struct inode *inode, struct file *file)
1360 {
1361         return single_open(file, capi20_proc_show, NULL);
1362 }
1363
1364 static const struct file_operations capi20_proc_fops = {
1365         .owner          = THIS_MODULE,
1366         .open           = capi20_proc_open,
1367         .read           = seq_read,
1368         .llseek         = seq_lseek,
1369         .release        = single_release,
1370 };
1371
1372 /*
1373  * /proc/capi/capi20ncci:
1374  *  applid ncci
1375  */
1376 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1377 {
1378         struct capidev *cdev;
1379         struct capincci *np;
1380
1381         mutex_lock(&capidev_list_lock);
1382         list_for_each_entry(cdev, &capidev_list, list) {
1383                 mutex_lock(&cdev->lock);
1384                 list_for_each_entry(np, &cdev->nccis, list)
1385                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1386                 mutex_unlock(&cdev->lock);
1387         }
1388         mutex_unlock(&capidev_list_lock);
1389         return 0;
1390 }
1391
1392 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1393 {
1394         return single_open(file, capi20ncci_proc_show, NULL);
1395 }
1396
1397 static const struct file_operations capi20ncci_proc_fops = {
1398         .owner          = THIS_MODULE,
1399         .open           = capi20ncci_proc_open,
1400         .read           = seq_read,
1401         .llseek         = seq_lseek,
1402         .release        = single_release,
1403 };
1404
1405 static void __init proc_init(void)
1406 {
1407         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1408         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1409 }
1410
1411 static void __exit proc_exit(void)
1412 {
1413         remove_proc_entry("capi/capi20", NULL);
1414         remove_proc_entry("capi/capi20ncci", NULL);
1415 }
1416
1417 /* -------- init function and module interface ---------------------- */
1418
1419
1420 static int __init capi_init(void)
1421 {
1422         const char *compileinfo;
1423         int major_ret;
1424
1425         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1426         if (major_ret < 0) {
1427                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1428                 return major_ret;
1429         }
1430         capi_class = class_create(THIS_MODULE, "capi");
1431         if (IS_ERR(capi_class)) {
1432                 unregister_chrdev(capi_major, "capi20");
1433                 return PTR_ERR(capi_class);
1434         }
1435
1436         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1437
1438         if (capinc_tty_init() < 0) {
1439                 device_destroy(capi_class, MKDEV(capi_major, 0));
1440                 class_destroy(capi_class);
1441                 unregister_chrdev(capi_major, "capi20");
1442                 return -ENOMEM;
1443         }
1444
1445         proc_init();
1446
1447 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1448         compileinfo = " (middleware)";
1449 #else
1450         compileinfo = " (no middleware)";
1451 #endif
1452         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1453                capi_major, compileinfo);
1454
1455         return 0;
1456 }
1457
1458 static void __exit capi_exit(void)
1459 {
1460         proc_exit();
1461
1462         device_destroy(capi_class, MKDEV(capi_major, 0));
1463         class_destroy(capi_class);
1464         unregister_chrdev(capi_major, "capi20");
1465
1466         capinc_tty_exit();
1467 }
1468
1469 module_init(capi_init);
1470 module_exit(capi_exit);