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gpio: samsung: add devicetree init for s3c24xx arches
[deliverable/linux.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 #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 tty_struct *tty;
574 struct capiminor *mp;
575 u16 datahandle;
576 struct capincci *np;
577 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
578
579 mutex_lock(&cdev->lock);
580
581 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
582 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
583 if ((info & 0xff00) == 0)
584 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
585 }
586 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
587 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
588
589 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
590 skb_queue_tail(&cdev->recvqueue, skb);
591 wake_up_interruptible(&cdev->recvwait);
592 goto unlock_out;
593 }
594
595 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
596 skb_queue_tail(&cdev->recvqueue, skb);
597 wake_up_interruptible(&cdev->recvwait);
598
599 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
600
601 np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
602 if (!np) {
603 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
604 skb_queue_tail(&cdev->recvqueue, skb);
605 wake_up_interruptible(&cdev->recvwait);
606 goto unlock_out;
607 }
608
609 mp = np->minorp;
610 if (!mp) {
611 skb_queue_tail(&cdev->recvqueue, skb);
612 wake_up_interruptible(&cdev->recvwait);
613 goto unlock_out;
614 }
615 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
616 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
617 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
618 datahandle, skb->len-CAPIMSG_LEN(skb->data));
619 skb_queue_tail(&mp->inqueue, skb);
620
621 handle_minor_recv(mp);
622
623 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
624
625 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
626 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
627 datahandle,
628 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
629 kfree_skb(skb);
630 capiminor_del_ack(mp, datahandle);
631 tty = tty_port_tty_get(&mp->port);
632 if (tty) {
633 tty_wakeup(tty);
634 tty_kref_put(tty);
635 }
636 handle_minor_send(mp);
637
638 } else {
639 /* ups, let capi application handle it :-) */
640 skb_queue_tail(&cdev->recvqueue, skb);
641 wake_up_interruptible(&cdev->recvwait);
642 }
643 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
644
645 unlock_out:
646 mutex_unlock(&cdev->lock);
647 }
648
649 /* -------- file_operations for capidev ----------------------------- */
650
651 static ssize_t
652 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
653 {
654 struct capidev *cdev = file->private_data;
655 struct sk_buff *skb;
656 size_t copied;
657 int err;
658
659 if (!cdev->ap.applid)
660 return -ENODEV;
661
662 skb = skb_dequeue(&cdev->recvqueue);
663 if (!skb) {
664 if (file->f_flags & O_NONBLOCK)
665 return -EAGAIN;
666 err = wait_event_interruptible(cdev->recvwait,
667 (skb = skb_dequeue(&cdev->recvqueue)));
668 if (err)
669 return err;
670 }
671 if (skb->len > count) {
672 skb_queue_head(&cdev->recvqueue, skb);
673 return -EMSGSIZE;
674 }
675 if (copy_to_user(buf, skb->data, skb->len)) {
676 skb_queue_head(&cdev->recvqueue, skb);
677 return -EFAULT;
678 }
679 copied = skb->len;
680
681 kfree_skb(skb);
682
683 return copied;
684 }
685
686 static ssize_t
687 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
688 {
689 struct capidev *cdev = file->private_data;
690 struct sk_buff *skb;
691 u16 mlen;
692
693 if (!cdev->ap.applid)
694 return -ENODEV;
695
696 skb = alloc_skb(count, GFP_USER);
697 if (!skb)
698 return -ENOMEM;
699
700 if (copy_from_user(skb_put(skb, count), buf, count)) {
701 kfree_skb(skb);
702 return -EFAULT;
703 }
704 mlen = CAPIMSG_LEN(skb->data);
705 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
706 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
707 kfree_skb(skb);
708 return -EINVAL;
709 }
710 } else {
711 if (mlen != count) {
712 kfree_skb(skb);
713 return -EINVAL;
714 }
715 }
716 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
717
718 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
719 mutex_lock(&cdev->lock);
720 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
721 mutex_unlock(&cdev->lock);
722 }
723
724 cdev->errcode = capi20_put_message(&cdev->ap, skb);
725
726 if (cdev->errcode) {
727 kfree_skb(skb);
728 return -EIO;
729 }
730 return count;
731 }
732
733 static unsigned int
734 capi_poll(struct file *file, poll_table *wait)
735 {
736 struct capidev *cdev = file->private_data;
737 unsigned int mask = 0;
738
739 if (!cdev->ap.applid)
740 return POLLERR;
741
742 poll_wait(file, &(cdev->recvwait), wait);
743 mask = POLLOUT | POLLWRNORM;
744 if (!skb_queue_empty(&cdev->recvqueue))
745 mask |= POLLIN | POLLRDNORM;
746 return mask;
747 }
748
749 static int
750 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
751 {
752 struct capidev *cdev = file->private_data;
753 capi_ioctl_struct data;
754 int retval = -EINVAL;
755 void __user *argp = (void __user *)arg;
756
757 switch (cmd) {
758 case CAPI_REGISTER:
759 mutex_lock(&cdev->lock);
760
761 if (cdev->ap.applid) {
762 retval = -EEXIST;
763 goto register_out;
764 }
765 if (copy_from_user(&cdev->ap.rparam, argp,
766 sizeof(struct capi_register_params))) {
767 retval = -EFAULT;
768 goto register_out;
769 }
770 cdev->ap.private = cdev;
771 cdev->ap.recv_message = capi_recv_message;
772 cdev->errcode = capi20_register(&cdev->ap);
773 retval = (int)cdev->ap.applid;
774 if (cdev->errcode) {
775 cdev->ap.applid = 0;
776 retval = -EIO;
777 }
778
779 register_out:
780 mutex_unlock(&cdev->lock);
781 return retval;
782
783 case CAPI_GET_VERSION:
784 if (copy_from_user(&data.contr, argp,
785 sizeof(data.contr)))
786 return -EFAULT;
787 cdev->errcode = capi20_get_version(data.contr, &data.version);
788 if (cdev->errcode)
789 return -EIO;
790 if (copy_to_user(argp, &data.version,
791 sizeof(data.version)))
792 return -EFAULT;
793 return 0;
794
795 case CAPI_GET_SERIAL:
796 if (copy_from_user(&data.contr, argp,
797 sizeof(data.contr)))
798 return -EFAULT;
799 cdev->errcode = capi20_get_serial(data.contr, data.serial);
800 if (cdev->errcode)
801 return -EIO;
802 if (copy_to_user(argp, data.serial,
803 sizeof(data.serial)))
804 return -EFAULT;
805 return 0;
806
807 case CAPI_GET_PROFILE:
808 if (copy_from_user(&data.contr, argp,
809 sizeof(data.contr)))
810 return -EFAULT;
811
812 if (data.contr == 0) {
813 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
814 if (cdev->errcode)
815 return -EIO;
816
817 retval = copy_to_user(argp,
818 &data.profile.ncontroller,
819 sizeof(data.profile.ncontroller));
820
821 } else {
822 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
823 if (cdev->errcode)
824 return -EIO;
825
826 retval = copy_to_user(argp, &data.profile,
827 sizeof(data.profile));
828 }
829 if (retval)
830 return -EFAULT;
831 return 0;
832
833 case CAPI_GET_MANUFACTURER:
834 if (copy_from_user(&data.contr, argp,
835 sizeof(data.contr)))
836 return -EFAULT;
837 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
838 if (cdev->errcode)
839 return -EIO;
840
841 if (copy_to_user(argp, data.manufacturer,
842 sizeof(data.manufacturer)))
843 return -EFAULT;
844
845 return 0;
846
847 case CAPI_GET_ERRCODE:
848 data.errcode = cdev->errcode;
849 cdev->errcode = CAPI_NOERROR;
850 if (arg) {
851 if (copy_to_user(argp, &data.errcode,
852 sizeof(data.errcode)))
853 return -EFAULT;
854 }
855 return data.errcode;
856
857 case CAPI_INSTALLED:
858 if (capi20_isinstalled() == CAPI_NOERROR)
859 return 0;
860 return -ENXIO;
861
862 case CAPI_MANUFACTURER_CMD: {
863 struct capi_manufacturer_cmd mcmd;
864 if (!capable(CAP_SYS_ADMIN))
865 return -EPERM;
866 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
867 return -EFAULT;
868 return capi20_manufacturer(mcmd.cmd, mcmd.data);
869 }
870 case CAPI_SET_FLAGS:
871 case CAPI_CLR_FLAGS: {
872 unsigned userflags;
873
874 if (copy_from_user(&userflags, argp, sizeof(userflags)))
875 return -EFAULT;
876
877 mutex_lock(&cdev->lock);
878 if (cmd == CAPI_SET_FLAGS)
879 cdev->userflags |= userflags;
880 else
881 cdev->userflags &= ~userflags;
882 mutex_unlock(&cdev->lock);
883 return 0;
884 }
885 case CAPI_GET_FLAGS:
886 if (copy_to_user(argp, &cdev->userflags,
887 sizeof(cdev->userflags)))
888 return -EFAULT;
889 return 0;
890
891 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
892 case CAPI_NCCI_OPENCOUNT:
893 return 0;
894
895 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
896 case CAPI_NCCI_OPENCOUNT: {
897 struct capincci *nccip;
898 unsigned ncci;
899 int count = 0;
900
901 if (copy_from_user(&ncci, argp, sizeof(ncci)))
902 return -EFAULT;
903
904 mutex_lock(&cdev->lock);
905 nccip = capincci_find(cdev, (u32)ncci);
906 if (nccip)
907 count = capincci_minor_opencount(nccip);
908 mutex_unlock(&cdev->lock);
909 return count;
910 }
911
912 case CAPI_NCCI_GETUNIT: {
913 struct capincci *nccip;
914 struct capiminor *mp;
915 unsigned ncci;
916 int unit = -ESRCH;
917
918 if (copy_from_user(&ncci, argp, sizeof(ncci)))
919 return -EFAULT;
920
921 mutex_lock(&cdev->lock);
922 nccip = capincci_find(cdev, (u32)ncci);
923 if (nccip) {
924 mp = nccip->minorp;
925 if (mp)
926 unit = mp->minor;
927 }
928 mutex_unlock(&cdev->lock);
929 return unit;
930 }
931 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
932
933 default:
934 return -EINVAL;
935 }
936 }
937
938 static long
939 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
940 {
941 int ret;
942
943 mutex_lock(&capi_mutex);
944 ret = capi_ioctl(file, cmd, arg);
945 mutex_unlock(&capi_mutex);
946
947 return ret;
948 }
949
950 static int capi_open(struct inode *inode, struct file *file)
951 {
952 struct capidev *cdev;
953
954 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
955 if (!cdev)
956 return -ENOMEM;
957
958 mutex_init(&cdev->lock);
959 skb_queue_head_init(&cdev->recvqueue);
960 init_waitqueue_head(&cdev->recvwait);
961 INIT_LIST_HEAD(&cdev->nccis);
962 file->private_data = cdev;
963
964 mutex_lock(&capidev_list_lock);
965 list_add_tail(&cdev->list, &capidev_list);
966 mutex_unlock(&capidev_list_lock);
967
968 return nonseekable_open(inode, file);
969 }
970
971 static int capi_release(struct inode *inode, struct file *file)
972 {
973 struct capidev *cdev = file->private_data;
974
975 mutex_lock(&capidev_list_lock);
976 list_del(&cdev->list);
977 mutex_unlock(&capidev_list_lock);
978
979 if (cdev->ap.applid)
980 capi20_release(&cdev->ap);
981 skb_queue_purge(&cdev->recvqueue);
982 capincci_free(cdev, 0xffffffff);
983
984 kfree(cdev);
985 return 0;
986 }
987
988 static const struct file_operations capi_fops =
989 {
990 .owner = THIS_MODULE,
991 .llseek = no_llseek,
992 .read = capi_read,
993 .write = capi_write,
994 .poll = capi_poll,
995 .unlocked_ioctl = capi_unlocked_ioctl,
996 .open = capi_open,
997 .release = capi_release,
998 };
999
1000 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1001 /* -------- tty_operations for capincci ----------------------------- */
1002
1003 static int
1004 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1005 {
1006 struct capiminor *mp = capiminor_get(tty->index);
1007 int ret = tty_standard_install(driver, tty);
1008
1009 if (ret == 0)
1010 tty->driver_data = mp;
1011 else
1012 capiminor_put(mp);
1013 return ret;
1014 }
1015
1016 static void capinc_tty_cleanup(struct tty_struct *tty)
1017 {
1018 struct capiminor *mp = tty->driver_data;
1019 tty->driver_data = NULL;
1020 capiminor_put(mp);
1021 }
1022
1023 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1024 {
1025 struct capiminor *mp = tty->driver_data;
1026 int err;
1027
1028 err = tty_port_open(&mp->port, tty, filp);
1029 if (err)
1030 return err;
1031
1032 handle_minor_recv(mp);
1033 return 0;
1034 }
1035
1036 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1037 {
1038 struct capiminor *mp = tty->driver_data;
1039
1040 tty_port_close(&mp->port, tty, filp);
1041 }
1042
1043 static int capinc_tty_write(struct tty_struct *tty,
1044 const unsigned char *buf, int count)
1045 {
1046 struct capiminor *mp = tty->driver_data;
1047 struct sk_buff *skb;
1048
1049 pr_debug("capinc_tty_write(count=%d)\n", count);
1050
1051 spin_lock_bh(&mp->outlock);
1052 skb = mp->outskb;
1053 if (skb) {
1054 mp->outskb = NULL;
1055 __skb_queue_tail(&mp->outqueue, skb);
1056 mp->outbytes += skb->len;
1057 }
1058
1059 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1060 if (!skb) {
1061 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1062 spin_unlock_bh(&mp->outlock);
1063 return -ENOMEM;
1064 }
1065
1066 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1067 memcpy(skb_put(skb, count), buf, count);
1068
1069 __skb_queue_tail(&mp->outqueue, skb);
1070 mp->outbytes += skb->len;
1071 spin_unlock_bh(&mp->outlock);
1072
1073 handle_minor_send(mp);
1074
1075 return count;
1076 }
1077
1078 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1079 {
1080 struct capiminor *mp = tty->driver_data;
1081 bool invoke_send = false;
1082 struct sk_buff *skb;
1083 int ret = 1;
1084
1085 pr_debug("capinc_put_char(%u)\n", ch);
1086
1087 spin_lock_bh(&mp->outlock);
1088 skb = mp->outskb;
1089 if (skb) {
1090 if (skb_tailroom(skb) > 0) {
1091 *(skb_put(skb, 1)) = ch;
1092 goto unlock_out;
1093 }
1094 mp->outskb = NULL;
1095 __skb_queue_tail(&mp->outqueue, skb);
1096 mp->outbytes += skb->len;
1097 invoke_send = true;
1098 }
1099
1100 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1101 if (skb) {
1102 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1103 *(skb_put(skb, 1)) = ch;
1104 mp->outskb = skb;
1105 } else {
1106 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1107 ret = 0;
1108 }
1109
1110 unlock_out:
1111 spin_unlock_bh(&mp->outlock);
1112
1113 if (invoke_send)
1114 handle_minor_send(mp);
1115
1116 return ret;
1117 }
1118
1119 static void capinc_tty_flush_chars(struct tty_struct *tty)
1120 {
1121 struct capiminor *mp = tty->driver_data;
1122 struct sk_buff *skb;
1123
1124 pr_debug("capinc_tty_flush_chars\n");
1125
1126 spin_lock_bh(&mp->outlock);
1127 skb = mp->outskb;
1128 if (skb) {
1129 mp->outskb = NULL;
1130 __skb_queue_tail(&mp->outqueue, skb);
1131 mp->outbytes += skb->len;
1132 spin_unlock_bh(&mp->outlock);
1133
1134 handle_minor_send(mp);
1135 } else
1136 spin_unlock_bh(&mp->outlock);
1137
1138 handle_minor_recv(mp);
1139 }
1140
1141 static int capinc_tty_write_room(struct tty_struct *tty)
1142 {
1143 struct capiminor *mp = tty->driver_data;
1144 int room;
1145
1146 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1147 room *= CAPI_MAX_BLKSIZE;
1148 pr_debug("capinc_tty_write_room = %d\n", room);
1149 return room;
1150 }
1151
1152 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1153 {
1154 struct capiminor *mp = tty->driver_data;
1155
1156 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1157 mp->outbytes, mp->nack,
1158 skb_queue_len(&mp->outqueue),
1159 skb_queue_len(&mp->inqueue));
1160 return mp->outbytes;
1161 }
1162
1163 static int capinc_tty_ioctl(struct tty_struct *tty,
1164 unsigned int cmd, unsigned long arg)
1165 {
1166 return -ENOIOCTLCMD;
1167 }
1168
1169 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1170 {
1171 pr_debug("capinc_tty_set_termios\n");
1172 }
1173
1174 static void capinc_tty_throttle(struct tty_struct *tty)
1175 {
1176 struct capiminor *mp = tty->driver_data;
1177 pr_debug("capinc_tty_throttle\n");
1178 mp->ttyinstop = 1;
1179 }
1180
1181 static void capinc_tty_unthrottle(struct tty_struct *tty)
1182 {
1183 struct capiminor *mp = tty->driver_data;
1184
1185 pr_debug("capinc_tty_unthrottle\n");
1186 mp->ttyinstop = 0;
1187 handle_minor_recv(mp);
1188 }
1189
1190 static void capinc_tty_stop(struct tty_struct *tty)
1191 {
1192 struct capiminor *mp = tty->driver_data;
1193
1194 pr_debug("capinc_tty_stop\n");
1195 mp->ttyoutstop = 1;
1196 }
1197
1198 static void capinc_tty_start(struct tty_struct *tty)
1199 {
1200 struct capiminor *mp = tty->driver_data;
1201
1202 pr_debug("capinc_tty_start\n");
1203 mp->ttyoutstop = 0;
1204 handle_minor_send(mp);
1205 }
1206
1207 static void capinc_tty_hangup(struct tty_struct *tty)
1208 {
1209 struct capiminor *mp = tty->driver_data;
1210
1211 pr_debug("capinc_tty_hangup\n");
1212 tty_port_hangup(&mp->port);
1213 }
1214
1215 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1216 {
1217 pr_debug("capinc_tty_break_ctl(%d)\n", state);
1218 return 0;
1219 }
1220
1221 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1222 {
1223 pr_debug("capinc_tty_flush_buffer\n");
1224 }
1225
1226 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1227 {
1228 pr_debug("capinc_tty_set_ldisc\n");
1229 }
1230
1231 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1232 {
1233 pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1234 }
1235
1236 static const struct tty_operations capinc_ops = {
1237 .open = capinc_tty_open,
1238 .close = capinc_tty_close,
1239 .write = capinc_tty_write,
1240 .put_char = capinc_tty_put_char,
1241 .flush_chars = capinc_tty_flush_chars,
1242 .write_room = capinc_tty_write_room,
1243 .chars_in_buffer = capinc_tty_chars_in_buffer,
1244 .ioctl = capinc_tty_ioctl,
1245 .set_termios = capinc_tty_set_termios,
1246 .throttle = capinc_tty_throttle,
1247 .unthrottle = capinc_tty_unthrottle,
1248 .stop = capinc_tty_stop,
1249 .start = capinc_tty_start,
1250 .hangup = capinc_tty_hangup,
1251 .break_ctl = capinc_tty_break_ctl,
1252 .flush_buffer = capinc_tty_flush_buffer,
1253 .set_ldisc = capinc_tty_set_ldisc,
1254 .send_xchar = capinc_tty_send_xchar,
1255 .install = capinc_tty_install,
1256 .cleanup = capinc_tty_cleanup,
1257 };
1258
1259 static int __init capinc_tty_init(void)
1260 {
1261 struct tty_driver *drv;
1262 int err;
1263
1264 if (capi_ttyminors > CAPINC_MAX_PORTS)
1265 capi_ttyminors = CAPINC_MAX_PORTS;
1266 if (capi_ttyminors <= 0)
1267 capi_ttyminors = CAPINC_NR_PORTS;
1268
1269 capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1270 GFP_KERNEL);
1271 if (!capiminors)
1272 return -ENOMEM;
1273
1274 drv = alloc_tty_driver(capi_ttyminors);
1275 if (!drv) {
1276 kfree(capiminors);
1277 return -ENOMEM;
1278 }
1279 drv->driver_name = "capi_nc";
1280 drv->name = "capi";
1281 drv->major = 0;
1282 drv->minor_start = 0;
1283 drv->type = TTY_DRIVER_TYPE_SERIAL;
1284 drv->subtype = SERIAL_TYPE_NORMAL;
1285 drv->init_termios = tty_std_termios;
1286 drv->init_termios.c_iflag = ICRNL;
1287 drv->init_termios.c_oflag = OPOST | ONLCR;
1288 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1289 drv->init_termios.c_lflag = 0;
1290 drv->flags =
1291 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1292 TTY_DRIVER_DYNAMIC_DEV;
1293 tty_set_operations(drv, &capinc_ops);
1294
1295 err = tty_register_driver(drv);
1296 if (err) {
1297 put_tty_driver(drv);
1298 kfree(capiminors);
1299 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1300 return err;
1301 }
1302 capinc_tty_driver = drv;
1303 return 0;
1304 }
1305
1306 static void __exit capinc_tty_exit(void)
1307 {
1308 tty_unregister_driver(capinc_tty_driver);
1309 put_tty_driver(capinc_tty_driver);
1310 kfree(capiminors);
1311 }
1312
1313 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1314
1315 static inline int capinc_tty_init(void)
1316 {
1317 return 0;
1318 }
1319
1320 static inline void capinc_tty_exit(void) { }
1321
1322 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1323
1324 /* -------- /proc functions ----------------------------------------- */
1325
1326 /*
1327 * /proc/capi/capi20:
1328 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1329 */
1330 static int capi20_proc_show(struct seq_file *m, void *v)
1331 {
1332 struct capidev *cdev;
1333 struct list_head *l;
1334
1335 mutex_lock(&capidev_list_lock);
1336 list_for_each(l, &capidev_list) {
1337 cdev = list_entry(l, struct capidev, list);
1338 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1339 cdev->ap.applid,
1340 cdev->ap.nrecvctlpkt,
1341 cdev->ap.nrecvdatapkt,
1342 cdev->ap.nsentctlpkt,
1343 cdev->ap.nsentdatapkt);
1344 }
1345 mutex_unlock(&capidev_list_lock);
1346 return 0;
1347 }
1348
1349 static int capi20_proc_open(struct inode *inode, struct file *file)
1350 {
1351 return single_open(file, capi20_proc_show, NULL);
1352 }
1353
1354 static const struct file_operations capi20_proc_fops = {
1355 .owner = THIS_MODULE,
1356 .open = capi20_proc_open,
1357 .read = seq_read,
1358 .llseek = seq_lseek,
1359 .release = single_release,
1360 };
1361
1362 /*
1363 * /proc/capi/capi20ncci:
1364 * applid ncci
1365 */
1366 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1367 {
1368 struct capidev *cdev;
1369 struct capincci *np;
1370
1371 mutex_lock(&capidev_list_lock);
1372 list_for_each_entry(cdev, &capidev_list, list) {
1373 mutex_lock(&cdev->lock);
1374 list_for_each_entry(np, &cdev->nccis, list)
1375 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1376 mutex_unlock(&cdev->lock);
1377 }
1378 mutex_unlock(&capidev_list_lock);
1379 return 0;
1380 }
1381
1382 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1383 {
1384 return single_open(file, capi20ncci_proc_show, NULL);
1385 }
1386
1387 static const struct file_operations capi20ncci_proc_fops = {
1388 .owner = THIS_MODULE,
1389 .open = capi20ncci_proc_open,
1390 .read = seq_read,
1391 .llseek = seq_lseek,
1392 .release = single_release,
1393 };
1394
1395 static void __init proc_init(void)
1396 {
1397 proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1398 proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1399 }
1400
1401 static void __exit proc_exit(void)
1402 {
1403 remove_proc_entry("capi/capi20", NULL);
1404 remove_proc_entry("capi/capi20ncci", NULL);
1405 }
1406
1407 /* -------- init function and module interface ---------------------- */
1408
1409
1410 static int __init capi_init(void)
1411 {
1412 const char *compileinfo;
1413 int major_ret;
1414
1415 major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1416 if (major_ret < 0) {
1417 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1418 return major_ret;
1419 }
1420 capi_class = class_create(THIS_MODULE, "capi");
1421 if (IS_ERR(capi_class)) {
1422 unregister_chrdev(capi_major, "capi20");
1423 return PTR_ERR(capi_class);
1424 }
1425
1426 device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1427
1428 if (capinc_tty_init() < 0) {
1429 device_destroy(capi_class, MKDEV(capi_major, 0));
1430 class_destroy(capi_class);
1431 unregister_chrdev(capi_major, "capi20");
1432 return -ENOMEM;
1433 }
1434
1435 proc_init();
1436
1437 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1438 compileinfo = " (middleware)";
1439 #else
1440 compileinfo = " (no middleware)";
1441 #endif
1442 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1443 capi_major, compileinfo);
1444
1445 return 0;
1446 }
1447
1448 static void __exit capi_exit(void)
1449 {
1450 proc_exit();
1451
1452 device_destroy(capi_class, MKDEV(capi_major, 0));
1453 class_destroy(capi_class);
1454 unregister_chrdev(capi_major, "capi20");
1455
1456 capinc_tty_exit();
1457 }
1458
1459 module_init(capi_init);
1460 module_exit(capi_exit);
Linux kernel - Deliverables
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