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fix writev regression: pan hanging unkillable and un-straceable
[pv_ops_mirror.git] / drivers / isdn / capi / capi.c
blob23ae66c76d47f2698f5daeabdf548bab5c03ddbe
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 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
26 #include <linux/tty.h>
27 #ifdef CONFIG_PPP
28 #include <linux/netdevice.h>
29 #include <linux/ppp_defs.h>
30 #include <linux/if_ppp.h>
31 #endif /* CONFIG_PPP */
32 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
33 #include <linux/skbuff.h>
34 #include <linux/proc_fs.h>
35 #include <linux/poll.h>
36 #include <linux/capi.h>
37 #include <linux/kernelcapi.h>
38 #include <linux/init.h>
39 #include <linux/device.h>
40 #include <linux/moduleparam.h>
41 #include <linux/isdn/capiutil.h>
42 #include <linux/isdn/capicmd.h>
43 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
44 #include "capifs.h"
45 #endif
46
47 static char *revision = "$Revision: 1.1.2.7 $";
48
49 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
50 MODULE_AUTHOR("Carsten Paeth");
51 MODULE_LICENSE("GPL");
52
53 #undef _DEBUG_REFCOUNT /* alloc/free and open/close debug */
54 #undef _DEBUG_TTYFUNCS /* call to tty_driver */
55 #undef _DEBUG_DATAFLOW /* data flow */
56
57 /* -------- driver information -------------------------------------- */
58
59 static struct class *capi_class;
60
61 static int capi_major = 68; /* allocated */
62 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
63 #define CAPINC_NR_PORTS 32
64 #define CAPINC_MAX_PORTS 256
65 static int capi_ttymajor = 191;
66 static int capi_ttyminors = CAPINC_NR_PORTS;
67 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
68
69 module_param_named(major, capi_major, uint, 0);
70 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
71 module_param_named(ttymajor, capi_ttymajor, uint, 0);
72 module_param_named(ttyminors, capi_ttyminors, uint, 0);
73 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
74
75 /* -------- defines ------------------------------------------------- */
76
77 #define CAPINC_MAX_RECVQUEUE 10
78 #define CAPINC_MAX_SENDQUEUE 10
79 #define CAPI_MAX_BLKSIZE 2048
80
81 /* -------- data structures ----------------------------------------- */
82
83 struct capidev;
84 struct capincci;
85 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
86 struct capiminor;
87
88 struct datahandle_queue {
89 struct list_head list;
90 u16 datahandle;
91 };
92
93 struct capiminor {
94 struct list_head list;
95 struct capincci *nccip;
96 unsigned int minor;
97
98 struct capi20_appl *ap;
99 u32 ncci;
100 u16 datahandle;
101 u16 msgid;
102
103 struct tty_struct *tty;
104 int ttyinstop;
105 int ttyoutstop;
106 struct sk_buff *ttyskb;
107 atomic_t ttyopencount;
108
109 struct sk_buff_head inqueue;
110 int inbytes;
111 struct sk_buff_head outqueue;
112 int outbytes;
113
114 /* transmit path */
115 struct list_head ackqueue;
116 int nack;
117 spinlock_t ackqlock;
118 };
119 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
120
121 /* FIXME: The following lock is a sledgehammer-workaround to a
122 * locking issue with the capiminor (and maybe other) data structure(s).
123 * Access to this data is done in a racy way and crashes the machine with
124 * a FritzCard DSL driver; sooner or later. This is a workaround
125 * which trades scalability vs stability, so it doesn't crash the kernel anymore.
126 * The correct (and scalable) fix for the issue seems to require
127 * an API change to the drivers... . */
128 static DEFINE_SPINLOCK(workaround_lock);
129
130 struct capincci {
131 struct capincci *next;
132 u32 ncci;
133 struct capidev *cdev;
134 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
135 struct capiminor *minorp;
136 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
137 };
138
139 struct capidev {
140 struct list_head list;
141 struct capi20_appl ap;
142 u16 errcode;
143 unsigned userflags;
144
145 struct sk_buff_head recvqueue;
146 wait_queue_head_t recvwait;
147
148 struct capincci *nccis;
149
150 struct mutex ncci_list_mtx;
151 };
152
153 /* -------- global variables ---------------------------------------- */
154
155 static DEFINE_RWLOCK(capidev_list_lock);
156 static LIST_HEAD(capidev_list);
157
158 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
159 static DEFINE_RWLOCK(capiminor_list_lock);
160 static LIST_HEAD(capiminor_list);
161 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
162
163 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
164 /* -------- datahandles --------------------------------------------- */
165
166 static int capincci_add_ack(struct capiminor *mp, u16 datahandle)
167 {
168 struct datahandle_queue *n;
169 unsigned long flags;
170
171 n = kmalloc(sizeof(*n), GFP_ATOMIC);
172 if (unlikely(!n)) {
173 printk(KERN_ERR "capi: alloc datahandle failed\n");
174 return -1;
175 }
176 n->datahandle = datahandle;
177 INIT_LIST_HEAD(&n->list);
178 spin_lock_irqsave(&mp->ackqlock, flags);
179 list_add_tail(&n->list, &mp->ackqueue);
180 mp->nack++;
181 spin_unlock_irqrestore(&mp->ackqlock, flags);
182 return 0;
183 }
184
185 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
186 {
187 struct datahandle_queue *p, *tmp;
188 unsigned long flags;
189
190 spin_lock_irqsave(&mp->ackqlock, flags);
191 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
192 if (p->datahandle == datahandle) {
193 list_del(&p->list);
194 kfree(p);
195 mp->nack--;
196 spin_unlock_irqrestore(&mp->ackqlock, flags);
197 return 0;
198 }
199 }
200 spin_unlock_irqrestore(&mp->ackqlock, flags);
201 return -1;
202 }
203
204 static void capiminor_del_all_ack(struct capiminor *mp)
205 {
206 struct datahandle_queue *p, *tmp;
207 unsigned long flags;
208
209 spin_lock_irqsave(&mp->ackqlock, flags);
210 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
211 list_del(&p->list);
212 kfree(p);
213 mp->nack--;
214 }
215 spin_unlock_irqrestore(&mp->ackqlock, flags);
216 }
217
218
219 /* -------- struct capiminor ---------------------------------------- */
220
221 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
222 {
223 struct capiminor *mp, *p;
224 unsigned int minor = 0;
225 unsigned long flags;
226
227 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
228 if (!mp) {
229 printk(KERN_ERR "capi: can't alloc capiminor\n");
230 return NULL;
231 }
232
233 mp->ap = ap;
234 mp->ncci = ncci;
235 mp->msgid = 0;
236 atomic_set(&mp->ttyopencount,0);
237 INIT_LIST_HEAD(&mp->ackqueue);
238 spin_lock_init(&mp->ackqlock);
239
240 skb_queue_head_init(&mp->inqueue);
241 skb_queue_head_init(&mp->outqueue);
242
243 /* Allocate the least unused minor number.
244 */
245 write_lock_irqsave(&capiminor_list_lock, flags);
246 if (list_empty(&capiminor_list))
247 list_add(&mp->list, &capiminor_list);
248 else {
249 list_for_each_entry(p, &capiminor_list, list) {
250 if (p->minor > minor)
251 break;
252 minor++;
253 }
254
255 if (minor < capi_ttyminors) {
256 mp->minor = minor;
257 list_add(&mp->list, p->list.prev);
258 }
259 }
260 write_unlock_irqrestore(&capiminor_list_lock, flags);
261
262 if (!(minor < capi_ttyminors)) {
263 printk(KERN_NOTICE "capi: out of minors\n");
264 kfree(mp);
265 return NULL;
266 }
267
268 return mp;
269 }
270
271 static void capiminor_free(struct capiminor *mp)
272 {
273 unsigned long flags;
274
275 write_lock_irqsave(&capiminor_list_lock, flags);
276 list_del(&mp->list);
277 write_unlock_irqrestore(&capiminor_list_lock, flags);
278
279 if (mp->ttyskb) kfree_skb(mp->ttyskb);
280 mp->ttyskb = NULL;
281 skb_queue_purge(&mp->inqueue);
282 skb_queue_purge(&mp->outqueue);
283 capiminor_del_all_ack(mp);
284 kfree(mp);
285 }
286
287 static struct capiminor *capiminor_find(unsigned int minor)
288 {
289 struct list_head *l;
290 struct capiminor *p = NULL;
291
292 read_lock(&capiminor_list_lock);
293 list_for_each(l, &capiminor_list) {
294 p = list_entry(l, struct capiminor, list);
295 if (p->minor == minor)
296 break;
297 }
298 read_unlock(&capiminor_list_lock);
299 if (l == &capiminor_list)
300 return NULL;
301
302 return p;
303 }
304 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
305
306 /* -------- struct capincci ----------------------------------------- */
307
308 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
309 {
310 struct capincci *np, **pp;
311 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
312 struct capiminor *mp = NULL;
313 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
314
315 np = kzalloc(sizeof(*np), GFP_ATOMIC);
316 if (!np)
317 return NULL;
318 np->ncci = ncci;
319 np->cdev = cdev;
320 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
321 mp = NULL;
322 if (cdev->userflags & CAPIFLAG_HIGHJACKING)
323 mp = np->minorp = capiminor_alloc(&cdev->ap, ncci);
324 if (mp) {
325 mp->nccip = np;
326 #ifdef _DEBUG_REFCOUNT
327 printk(KERN_DEBUG "set mp->nccip\n");
328 #endif
329 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
330 capifs_new_ncci(mp->minor, MKDEV(capi_ttymajor, mp->minor));
331 #endif
332 }
333 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
334 for (pp=&cdev->nccis; *pp; pp = &(*pp)->next)
335 ;
336 *pp = np;
337 return np;
338 }
339
340 static void capincci_free(struct capidev *cdev, u32 ncci)
341 {
342 struct capincci *np, **pp;
343 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
344 struct capiminor *mp;
345 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
346
347 pp=&cdev->nccis;
348 while (*pp) {
349 np = *pp;
350 if (ncci == 0xffffffff || np->ncci == ncci) {
351 *pp = (*pp)->next;
352 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
353 if ((mp = np->minorp) != 0) {
354 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
355 capifs_free_ncci(mp->minor);
356 #endif
357 if (mp->tty) {
358 mp->nccip = NULL;
359 #ifdef _DEBUG_REFCOUNT
360 printk(KERN_DEBUG "reset mp->nccip\n");
361 #endif
362 tty_hangup(mp->tty);
363 } else {
364 capiminor_free(mp);
365 }
366 }
367 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
368 kfree(np);
369 if (*pp == 0) return;
370 } else {
371 pp = &(*pp)->next;
372 }
373 }
374 }
375
376 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
377 {
378 struct capincci *p;
379
380 for (p=cdev->nccis; p ; p = p->next) {
381 if (p->ncci == ncci)
382 break;
383 }
384 return p;
385 }
386
387 /* -------- struct capidev ------------------------------------------ */
388
389 static struct capidev *capidev_alloc(void)
390 {
391 struct capidev *cdev;
392 unsigned long flags;
393
394 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
395 if (!cdev)
396 return NULL;
397
398 mutex_init(&cdev->ncci_list_mtx);
399 skb_queue_head_init(&cdev->recvqueue);
400 init_waitqueue_head(&cdev->recvwait);
401 write_lock_irqsave(&capidev_list_lock, flags);
402 list_add_tail(&cdev->list, &capidev_list);
403 write_unlock_irqrestore(&capidev_list_lock, flags);
404 return cdev;
405 }
406
407 static void capidev_free(struct capidev *cdev)
408 {
409 unsigned long flags;
410
411 if (cdev->ap.applid) {
412 capi20_release(&cdev->ap);
413 cdev->ap.applid = 0;
414 }
415 skb_queue_purge(&cdev->recvqueue);
416
417 mutex_lock(&cdev->ncci_list_mtx);
418 capincci_free(cdev, 0xffffffff);
419 mutex_unlock(&cdev->ncci_list_mtx);
420
421 write_lock_irqsave(&capidev_list_lock, flags);
422 list_del(&cdev->list);
423 write_unlock_irqrestore(&capidev_list_lock, flags);
424 kfree(cdev);
425 }
426
427 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
428 /* -------- handle data queue --------------------------------------- */
429
430 static struct sk_buff *
431 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
432 {
433 struct sk_buff *nskb;
434 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
435 if (nskb) {
436 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
437 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
438 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
439 capimsg_setu16(s, 2, mp->ap->applid);
440 capimsg_setu8 (s, 4, CAPI_DATA_B3);
441 capimsg_setu8 (s, 5, CAPI_RESP);
442 capimsg_setu16(s, 6, mp->msgid++);
443 capimsg_setu32(s, 8, mp->ncci);
444 capimsg_setu16(s, 12, datahandle);
445 }
446 return nskb;
447 }
448
449 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
450 {
451 struct sk_buff *nskb;
452 int datalen;
453 u16 errcode, datahandle;
454 struct tty_ldisc *ld;
455
456 datalen = skb->len - CAPIMSG_LEN(skb->data);
457 if (mp->tty == NULL)
458 {
459 #ifdef _DEBUG_DATAFLOW
460 printk(KERN_DEBUG "capi: currently no receiver\n");
461 #endif
462 return -1;
463 }
464
465 ld = tty_ldisc_ref(mp->tty);
466 if (ld == NULL)
467 return -1;
468 if (ld->receive_buf == NULL) {
469 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
470 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
471 #endif
472 goto bad;
473 }
474 if (mp->ttyinstop) {
475 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
476 printk(KERN_DEBUG "capi: recv tty throttled\n");
477 #endif
478 goto bad;
479 }
480 if (mp->tty->receive_room < datalen) {
481 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
482 printk(KERN_DEBUG "capi: no room in tty\n");
483 #endif
484 goto bad;
485 }
486 if ((nskb = gen_data_b3_resp_for(mp, skb)) == 0) {
487 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
488 goto bad;
489 }
490 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
491 errcode = capi20_put_message(mp->ap, nskb);
492 if (errcode != CAPI_NOERROR) {
493 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
494 errcode);
495 kfree_skb(nskb);
496 goto bad;
497 }
498 (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
499 #ifdef _DEBUG_DATAFLOW
500 printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
501 datahandle, skb->len);
502 #endif
503 ld->receive_buf(mp->tty, skb->data, NULL, skb->len);
504 kfree_skb(skb);
505 tty_ldisc_deref(ld);
506 return 0;
507 bad:
508 tty_ldisc_deref(ld);
509 return -1;
510 }
511
512 static void handle_minor_recv(struct capiminor *mp)
513 {
514 struct sk_buff *skb;
515 while ((skb = skb_dequeue(&mp->inqueue)) != 0) {
516 unsigned int len = skb->len;
517 mp->inbytes -= len;
518 if (handle_recv_skb(mp, skb) < 0) {
519 skb_queue_head(&mp->inqueue, skb);
520 mp->inbytes += len;
521 return;
522 }
523 }
524 }
525
526 static int handle_minor_send(struct capiminor *mp)
527 {
528 struct sk_buff *skb;
529 u16 len;
530 int count = 0;
531 u16 errcode;
532 u16 datahandle;
533
534 if (mp->tty && mp->ttyoutstop) {
535 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
536 printk(KERN_DEBUG "capi: send: tty stopped\n");
537 #endif
538 return 0;
539 }
540
541 while ((skb = skb_dequeue(&mp->outqueue)) != 0) {
542 datahandle = mp->datahandle;
543 len = (u16)skb->len;
544 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
545 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
546 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
547 capimsg_setu16(skb->data, 2, mp->ap->applid);
548 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
549 capimsg_setu8 (skb->data, 5, CAPI_REQ);
550 capimsg_setu16(skb->data, 6, mp->msgid++);
551 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
552 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
553 capimsg_setu16(skb->data, 16, len); /* Data length */
554 capimsg_setu16(skb->data, 18, datahandle);
555 capimsg_setu16(skb->data, 20, 0); /* Flags */
556
557 if (capincci_add_ack(mp, datahandle) < 0) {
558 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
559 skb_queue_head(&mp->outqueue, skb);
560 return count;
561 }
562 errcode = capi20_put_message(mp->ap, skb);
563 if (errcode == CAPI_NOERROR) {
564 mp->datahandle++;
565 count++;
566 mp->outbytes -= len;
567 #ifdef _DEBUG_DATAFLOW
568 printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
569 datahandle, len);
570 #endif
571 continue;
572 }
573 capiminor_del_ack(mp, datahandle);
574
575 if (errcode == CAPI_SENDQUEUEFULL) {
576 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
577 skb_queue_head(&mp->outqueue, skb);
578 break;
579 }
580
581 /* ups, drop packet */
582 printk(KERN_ERR "capi: put_message = %x\n", errcode);
583 mp->outbytes -= len;
584 kfree_skb(skb);
585 }
586 return count;
587 }
588
589 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
590 /* -------- function called by lower level -------------------------- */
591
592 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
593 {
594 struct capidev *cdev = ap->private;
595 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
596 struct capiminor *mp;
597 u16 datahandle;
598 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
599 struct capincci *np;
600 u32 ncci;
601 unsigned long flags;
602
603 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
604 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
605 if (info == 0) {
606 mutex_lock(&cdev->ncci_list_mtx);
607 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
608 mutex_unlock(&cdev->ncci_list_mtx);
609 }
610 }
611 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
612 mutex_lock(&cdev->ncci_list_mtx);
613 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
614 mutex_unlock(&cdev->ncci_list_mtx);
615 }
616 spin_lock_irqsave(&workaround_lock, flags);
617 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
618 skb_queue_tail(&cdev->recvqueue, skb);
619 wake_up_interruptible(&cdev->recvwait);
620 spin_unlock_irqrestore(&workaround_lock, flags);
621 return;
622 }
623 ncci = CAPIMSG_CONTROL(skb->data);
624 for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
625 ;
626 if (!np) {
627 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
628 skb_queue_tail(&cdev->recvqueue, skb);
629 wake_up_interruptible(&cdev->recvwait);
630 spin_unlock_irqrestore(&workaround_lock, flags);
631 return;
632 }
633 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
634 skb_queue_tail(&cdev->recvqueue, skb);
635 wake_up_interruptible(&cdev->recvwait);
636 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
637 mp = np->minorp;
638 if (!mp) {
639 skb_queue_tail(&cdev->recvqueue, skb);
640 wake_up_interruptible(&cdev->recvwait);
641 spin_unlock_irqrestore(&workaround_lock, flags);
642 return;
643 }
644
645
646 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
647
648 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
649 #ifdef _DEBUG_DATAFLOW
650 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
651 datahandle, skb->len-CAPIMSG_LEN(skb->data));
652 #endif
653 skb_queue_tail(&mp->inqueue, skb);
654 mp->inbytes += skb->len;
655 handle_minor_recv(mp);
656
657 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
658
659 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
660 #ifdef _DEBUG_DATAFLOW
661 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
662 datahandle,
663 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
664 #endif
665 kfree_skb(skb);
666 (void)capiminor_del_ack(mp, datahandle);
667 if (mp->tty)
668 tty_wakeup(mp->tty);
669 (void)handle_minor_send(mp);
670
671 } else {
672 /* ups, let capi application handle it :-) */
673 skb_queue_tail(&cdev->recvqueue, skb);
674 wake_up_interruptible(&cdev->recvwait);
675 }
676 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
677 spin_unlock_irqrestore(&workaround_lock, flags);
678 }
679
680 /* -------- file_operations for capidev ----------------------------- */
681
682 static ssize_t
683 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
684 {
685 struct capidev *cdev = (struct capidev *)file->private_data;
686 struct sk_buff *skb;
687 size_t copied;
688
689 if (!cdev->ap.applid)
690 return -ENODEV;
691
692 if ((skb = skb_dequeue(&cdev->recvqueue)) == 0) {
693
694 if (file->f_flags & O_NONBLOCK)
695 return -EAGAIN;
696
697 for (;;) {
698 interruptible_sleep_on(&cdev->recvwait);
699 if ((skb = skb_dequeue(&cdev->recvqueue)) != 0)
700 break;
701 if (signal_pending(current))
702 break;
703 }
704 if (skb == 0)
705 return -ERESTARTNOHAND;
706 }
707 if (skb->len > count) {
708 skb_queue_head(&cdev->recvqueue, skb);
709 return -EMSGSIZE;
710 }
711 if (copy_to_user(buf, skb->data, skb->len)) {
712 skb_queue_head(&cdev->recvqueue, skb);
713 return -EFAULT;
714 }
715 copied = skb->len;
716
717 kfree_skb(skb);
718
719 return copied;
720 }
721
722 static ssize_t
723 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
724 {
725 struct capidev *cdev = (struct capidev *)file->private_data;
726 struct sk_buff *skb;
727 u16 mlen;
728
729 if (!cdev->ap.applid)
730 return -ENODEV;
731
732 skb = alloc_skb(count, GFP_USER);
733 if (!skb)
734 return -ENOMEM;
735
736 if (copy_from_user(skb_put(skb, count), buf, count)) {
737 kfree_skb(skb);
738 return -EFAULT;
739 }
740 mlen = CAPIMSG_LEN(skb->data);
741 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
742 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
743 kfree_skb(skb);
744 return -EINVAL;
745 }
746 } else {
747 if (mlen != count) {
748 kfree_skb(skb);
749 return -EINVAL;
750 }
751 }
752 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
753
754 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
755 mutex_lock(&cdev->ncci_list_mtx);
756 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
757 mutex_unlock(&cdev->ncci_list_mtx);
758 }
759
760 cdev->errcode = capi20_put_message(&cdev->ap, skb);
761
762 if (cdev->errcode) {
763 kfree_skb(skb);
764 return -EIO;
765 }
766 return count;
767 }
768
769 static unsigned int
770 capi_poll(struct file *file, poll_table * wait)
771 {
772 struct capidev *cdev = (struct capidev *)file->private_data;
773 unsigned int mask = 0;
774
775 if (!cdev->ap.applid)
776 return POLLERR;
777
778 poll_wait(file, &(cdev->recvwait), wait);
779 mask = POLLOUT | POLLWRNORM;
780 if (!skb_queue_empty(&cdev->recvqueue))
781 mask |= POLLIN | POLLRDNORM;
782 return mask;
783 }
784
785 static int
786 capi_ioctl(struct inode *inode, struct file *file,
787 unsigned int cmd, unsigned long arg)
788 {
789 struct capidev *cdev = file->private_data;
790 struct capi20_appl *ap = &cdev->ap;
791 capi_ioctl_struct data;
792 int retval = -EINVAL;
793 void __user *argp = (void __user *)arg;
794
795 switch (cmd) {
796 case CAPI_REGISTER:
797 {
798 if (ap->applid)
799 return -EEXIST;
800
801 if (copy_from_user(&cdev->ap.rparam, argp,
802 sizeof(struct capi_register_params)))
803 return -EFAULT;
804
805 cdev->ap.private = cdev;
806 cdev->ap.recv_message = capi_recv_message;
807 cdev->errcode = capi20_register(ap);
808 if (cdev->errcode) {
809 ap->applid = 0;
810 return -EIO;
811 }
812 }
813 return (int)ap->applid;
814
815 case CAPI_GET_VERSION:
816 {
817 if (copy_from_user(&data.contr, argp,
818 sizeof(data.contr)))
819 return -EFAULT;
820 cdev->errcode = capi20_get_version(data.contr, &data.version);
821 if (cdev->errcode)
822 return -EIO;
823 if (copy_to_user(argp, &data.version,
824 sizeof(data.version)))
825 return -EFAULT;
826 }
827 return 0;
828
829 case CAPI_GET_SERIAL:
830 {
831 if (copy_from_user(&data.contr, argp,
832 sizeof(data.contr)))
833 return -EFAULT;
834 cdev->errcode = capi20_get_serial (data.contr, data.serial);
835 if (cdev->errcode)
836 return -EIO;
837 if (copy_to_user(argp, data.serial,
838 sizeof(data.serial)))
839 return -EFAULT;
840 }
841 return 0;
842 case CAPI_GET_PROFILE:
843 {
844 if (copy_from_user(&data.contr, argp,
845 sizeof(data.contr)))
846 return -EFAULT;
847
848 if (data.contr == 0) {
849 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
850 if (cdev->errcode)
851 return -EIO;
852
853 retval = copy_to_user(argp,
854 &data.profile.ncontroller,
855 sizeof(data.profile.ncontroller));
856
857 } else {
858 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
859 if (cdev->errcode)
860 return -EIO;
861
862 retval = copy_to_user(argp, &data.profile,
863 sizeof(data.profile));
864 }
865 if (retval)
866 return -EFAULT;
867 }
868 return 0;
869
870 case CAPI_GET_MANUFACTURER:
871 {
872 if (copy_from_user(&data.contr, argp,
873 sizeof(data.contr)))
874 return -EFAULT;
875 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
876 if (cdev->errcode)
877 return -EIO;
878
879 if (copy_to_user(argp, data.manufacturer,
880 sizeof(data.manufacturer)))
881 return -EFAULT;
882
883 }
884 return 0;
885 case CAPI_GET_ERRCODE:
886 data.errcode = cdev->errcode;
887 cdev->errcode = CAPI_NOERROR;
888 if (arg) {
889 if (copy_to_user(argp, &data.errcode,
890 sizeof(data.errcode)))
891 return -EFAULT;
892 }
893 return data.errcode;
894
895 case CAPI_INSTALLED:
896 if (capi20_isinstalled() == CAPI_NOERROR)
897 return 0;
898 return -ENXIO;
899
900 case CAPI_MANUFACTURER_CMD:
901 {
902 struct capi_manufacturer_cmd mcmd;
903 if (!capable(CAP_SYS_ADMIN))
904 return -EPERM;
905 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
906 return -EFAULT;
907 return capi20_manufacturer(mcmd.cmd, mcmd.data);
908 }
909 return 0;
910
911 case CAPI_SET_FLAGS:
912 case CAPI_CLR_FLAGS:
913 {
914 unsigned userflags;
915 if (copy_from_user(&userflags, argp,
916 sizeof(userflags)))
917 return -EFAULT;
918 if (cmd == CAPI_SET_FLAGS)
919 cdev->userflags |= userflags;
920 else
921 cdev->userflags &= ~userflags;
922 }
923 return 0;
924
925 case CAPI_GET_FLAGS:
926 if (copy_to_user(argp, &cdev->userflags,
927 sizeof(cdev->userflags)))
928 return -EFAULT;
929 return 0;
930
931 case CAPI_NCCI_OPENCOUNT:
932 {
933 struct capincci *nccip;
934 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
935 struct capiminor *mp;
936 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
937 unsigned ncci;
938 int count = 0;
939 if (copy_from_user(&ncci, argp, sizeof(ncci)))
940 return -EFAULT;
941
942 mutex_lock(&cdev->ncci_list_mtx);
943 if ((nccip = capincci_find(cdev, (u32) ncci)) == 0) {
944 mutex_unlock(&cdev->ncci_list_mtx);
945 return 0;
946 }
947 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
948 if ((mp = nccip->minorp) != 0) {
949 count += atomic_read(&mp->ttyopencount);
950 }
951 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
952 mutex_unlock(&cdev->ncci_list_mtx);
953 return count;
954 }
955 return 0;
956
957 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
958 case CAPI_NCCI_GETUNIT:
959 {
960 struct capincci *nccip;
961 struct capiminor *mp;
962 unsigned ncci;
963 int unit = 0;
964 if (copy_from_user(&ncci, argp,
965 sizeof(ncci)))
966 return -EFAULT;
967 mutex_lock(&cdev->ncci_list_mtx);
968 nccip = capincci_find(cdev, (u32) ncci);
969 if (!nccip || (mp = nccip->minorp) == 0) {
970 mutex_unlock(&cdev->ncci_list_mtx);
971 return -ESRCH;
972 }
973 unit = mp->minor;
974 mutex_unlock(&cdev->ncci_list_mtx);
975 return unit;
976 }
977 return 0;
978 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
979 }
980 return -EINVAL;
981 }
982
983 static int
984 capi_open(struct inode *inode, struct file *file)
985 {
986 if (file->private_data)
987 return -EEXIST;
988
989 if ((file->private_data = capidev_alloc()) == 0)
990 return -ENOMEM;
991
992 return nonseekable_open(inode, file);
993 }
994
995 static int
996 capi_release(struct inode *inode, struct file *file)
997 {
998 struct capidev *cdev = (struct capidev *)file->private_data;
999
1000 capidev_free(cdev);
1001 file->private_data = NULL;
1002
1003 return 0;
1004 }
1005
1006 static const struct file_operations capi_fops =
1007 {
1008 .owner = THIS_MODULE,
1009 .llseek = no_llseek,
1010 .read = capi_read,
1011 .write = capi_write,
1012 .poll = capi_poll,
1013 .ioctl = capi_ioctl,
1014 .open = capi_open,
1015 .release = capi_release,
1016 };
1017
1018 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1019 /* -------- tty_operations for capincci ----------------------------- */
1020
1021 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
1022 {
1023 struct capiminor *mp;
1024 unsigned long flags;
1025
1026 if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == 0)
1027 return -ENXIO;
1028 if (mp->nccip == 0)
1029 return -ENXIO;
1030
1031 tty->driver_data = (void *)mp;
1032
1033 spin_lock_irqsave(&workaround_lock, flags);
1034 if (atomic_read(&mp->ttyopencount) == 0)
1035 mp->tty = tty;
1036 atomic_inc(&mp->ttyopencount);
1037 #ifdef _DEBUG_REFCOUNT
1038 printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1039 #endif
1040 handle_minor_recv(mp);
1041 spin_unlock_irqrestore(&workaround_lock, flags);
1042 return 0;
1043 }
1044
1045 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1046 {
1047 struct capiminor *mp;
1048
1049 mp = (struct capiminor *)tty->driver_data;
1050 if (mp) {
1051 if (atomic_dec_and_test(&mp->ttyopencount)) {
1052 #ifdef _DEBUG_REFCOUNT
1053 printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1054 #endif
1055 tty->driver_data = NULL;
1056 mp->tty = NULL;
1057 }
1058 #ifdef _DEBUG_REFCOUNT
1059 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1060 #endif
1061 if (mp->nccip == 0)
1062 capiminor_free(mp);
1063 }
1064
1065 #ifdef _DEBUG_REFCOUNT
1066 printk(KERN_DEBUG "capinc_tty_close\n");
1067 #endif
1068 }
1069
1070 static int capinc_tty_write(struct tty_struct * tty,
1071 const unsigned char *buf, int count)
1072 {
1073 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1074 struct sk_buff *skb;
1075 unsigned long flags;
1076
1077 #ifdef _DEBUG_TTYFUNCS
1078 printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1079 #endif
1080
1081 if (!mp || !mp->nccip) {
1082 #ifdef _DEBUG_TTYFUNCS
1083 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1084 #endif
1085 return 0;
1086 }
1087
1088 spin_lock_irqsave(&workaround_lock, flags);
1089 skb = mp->ttyskb;
1090 if (skb) {
1091 mp->ttyskb = NULL;
1092 skb_queue_tail(&mp->outqueue, skb);
1093 mp->outbytes += skb->len;
1094 }
1095
1096 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1097 if (!skb) {
1098 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1099 spin_unlock_irqrestore(&workaround_lock, flags);
1100 return -ENOMEM;
1101 }
1102
1103 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1104 memcpy(skb_put(skb, count), buf, count);
1105
1106 skb_queue_tail(&mp->outqueue, skb);
1107 mp->outbytes += skb->len;
1108 (void)handle_minor_send(mp);
1109 (void)handle_minor_recv(mp);
1110 spin_unlock_irqrestore(&workaround_lock, flags);
1111 return count;
1112 }
1113
1114 static void capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1115 {
1116 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1117 struct sk_buff *skb;
1118 unsigned long flags;
1119
1120 #ifdef _DEBUG_TTYFUNCS
1121 printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1122 #endif
1123
1124 if (!mp || !mp->nccip) {
1125 #ifdef _DEBUG_TTYFUNCS
1126 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1127 #endif
1128 return;
1129 }
1130
1131 spin_lock_irqsave(&workaround_lock, flags);
1132 skb = mp->ttyskb;
1133 if (skb) {
1134 if (skb_tailroom(skb) > 0) {
1135 *(skb_put(skb, 1)) = ch;
1136 spin_unlock_irqrestore(&workaround_lock, flags);
1137 return;
1138 }
1139 mp->ttyskb = NULL;
1140 skb_queue_tail(&mp->outqueue, skb);
1141 mp->outbytes += skb->len;
1142 (void)handle_minor_send(mp);
1143 }
1144 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1145 if (skb) {
1146 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1147 *(skb_put(skb, 1)) = ch;
1148 mp->ttyskb = skb;
1149 } else {
1150 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1151 }
1152 spin_unlock_irqrestore(&workaround_lock, flags);
1153 }
1154
1155 static void capinc_tty_flush_chars(struct tty_struct *tty)
1156 {
1157 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1158 struct sk_buff *skb;
1159 unsigned long flags;
1160
1161 #ifdef _DEBUG_TTYFUNCS
1162 printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1163 #endif
1164
1165 if (!mp || !mp->nccip) {
1166 #ifdef _DEBUG_TTYFUNCS
1167 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1168 #endif
1169 return;
1170 }
1171
1172 spin_lock_irqsave(&workaround_lock, flags);
1173 skb = mp->ttyskb;
1174 if (skb) {
1175 mp->ttyskb = NULL;
1176 skb_queue_tail(&mp->outqueue, skb);
1177 mp->outbytes += skb->len;
1178 (void)handle_minor_send(mp);
1179 }
1180 (void)handle_minor_recv(mp);
1181 spin_unlock_irqrestore(&workaround_lock, flags);
1182 }
1183
1184 static int capinc_tty_write_room(struct tty_struct *tty)
1185 {
1186 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1187 int room;
1188 if (!mp || !mp->nccip) {
1189 #ifdef _DEBUG_TTYFUNCS
1190 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1191 #endif
1192 return 0;
1193 }
1194 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1195 room *= CAPI_MAX_BLKSIZE;
1196 #ifdef _DEBUG_TTYFUNCS
1197 printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1198 #endif
1199 return room;
1200 }
1201
1202 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1203 {
1204 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1205 if (!mp || !mp->nccip) {
1206 #ifdef _DEBUG_TTYFUNCS
1207 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1208 #endif
1209 return 0;
1210 }
1211 #ifdef _DEBUG_TTYFUNCS
1212 printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1213 mp->outbytes, mp->nack,
1214 skb_queue_len(&mp->outqueue),
1215 skb_queue_len(&mp->inqueue));
1216 #endif
1217 return mp->outbytes;
1218 }
1219
1220 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1221 unsigned int cmd, unsigned long arg)
1222 {
1223 int error = 0;
1224 switch (cmd) {
1225 default:
1226 error = n_tty_ioctl (tty, file, cmd, arg);
1227 break;
1228 }
1229 return error;
1230 }
1231
1232 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1233 {
1234 #ifdef _DEBUG_TTYFUNCS
1235 printk(KERN_DEBUG "capinc_tty_set_termios\n");
1236 #endif
1237 }
1238
1239 static void capinc_tty_throttle(struct tty_struct * tty)
1240 {
1241 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1242 #ifdef _DEBUG_TTYFUNCS
1243 printk(KERN_DEBUG "capinc_tty_throttle\n");
1244 #endif
1245 if (mp)
1246 mp->ttyinstop = 1;
1247 }
1248
1249 static void capinc_tty_unthrottle(struct tty_struct * tty)
1250 {
1251 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1252 unsigned long flags;
1253 #ifdef _DEBUG_TTYFUNCS
1254 printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1255 #endif
1256 if (mp) {
1257 spin_lock_irqsave(&workaround_lock, flags);
1258 mp->ttyinstop = 0;
1259 handle_minor_recv(mp);
1260 spin_unlock_irqrestore(&workaround_lock, flags);
1261 }
1262 }
1263
1264 static void capinc_tty_stop(struct tty_struct *tty)
1265 {
1266 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1267 #ifdef _DEBUG_TTYFUNCS
1268 printk(KERN_DEBUG "capinc_tty_stop\n");
1269 #endif
1270 if (mp) {
1271 mp->ttyoutstop = 1;
1272 }
1273 }
1274
1275 static void capinc_tty_start(struct tty_struct *tty)
1276 {
1277 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1278 unsigned long flags;
1279 #ifdef _DEBUG_TTYFUNCS
1280 printk(KERN_DEBUG "capinc_tty_start\n");
1281 #endif
1282 if (mp) {
1283 spin_lock_irqsave(&workaround_lock, flags);
1284 mp->ttyoutstop = 0;
1285 (void)handle_minor_send(mp);
1286 spin_unlock_irqrestore(&workaround_lock, flags);
1287 }
1288 }
1289
1290 static void capinc_tty_hangup(struct tty_struct *tty)
1291 {
1292 #ifdef _DEBUG_TTYFUNCS
1293 printk(KERN_DEBUG "capinc_tty_hangup\n");
1294 #endif
1295 }
1296
1297 static void capinc_tty_break_ctl(struct tty_struct *tty, int state)
1298 {
1299 #ifdef _DEBUG_TTYFUNCS
1300 printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1301 #endif
1302 }
1303
1304 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1305 {
1306 #ifdef _DEBUG_TTYFUNCS
1307 printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1308 #endif
1309 }
1310
1311 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1312 {
1313 #ifdef _DEBUG_TTYFUNCS
1314 printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1315 #endif
1316 }
1317
1318 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1319 {
1320 #ifdef _DEBUG_TTYFUNCS
1321 printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1322 #endif
1323 }
1324
1325 static int capinc_tty_read_proc(char *page, char **start, off_t off,
1326 int count, int *eof, void *data)
1327 {
1328 return 0;
1329 }
1330
1331 static struct tty_driver *capinc_tty_driver;
1332
1333 static const struct tty_operations capinc_ops = {
1334 .open = capinc_tty_open,
1335 .close = capinc_tty_close,
1336 .write = capinc_tty_write,
1337 .put_char = capinc_tty_put_char,
1338 .flush_chars = capinc_tty_flush_chars,
1339 .write_room = capinc_tty_write_room,
1340 .chars_in_buffer = capinc_tty_chars_in_buffer,
1341 .ioctl = capinc_tty_ioctl,
1342 .set_termios = capinc_tty_set_termios,
1343 .throttle = capinc_tty_throttle,
1344 .unthrottle = capinc_tty_unthrottle,
1345 .stop = capinc_tty_stop,
1346 .start = capinc_tty_start,
1347 .hangup = capinc_tty_hangup,
1348 .break_ctl = capinc_tty_break_ctl,
1349 .flush_buffer = capinc_tty_flush_buffer,
1350 .set_ldisc = capinc_tty_set_ldisc,
1351 .send_xchar = capinc_tty_send_xchar,
1352 .read_proc = capinc_tty_read_proc,
1353 };
1354
1355 static int capinc_tty_init(void)
1356 {
1357 struct tty_driver *drv;
1358
1359 if (capi_ttyminors > CAPINC_MAX_PORTS)
1360 capi_ttyminors = CAPINC_MAX_PORTS;
1361 if (capi_ttyminors <= 0)
1362 capi_ttyminors = CAPINC_NR_PORTS;
1363
1364 drv = alloc_tty_driver(capi_ttyminors);
1365 if (!drv)
1366 return -ENOMEM;
1367
1368 drv->owner = THIS_MODULE;
1369 drv->driver_name = "capi_nc";
1370 drv->name = "capi";
1371 drv->major = capi_ttymajor;
1372 drv->minor_start = 0;
1373 drv->type = TTY_DRIVER_TYPE_SERIAL;
1374 drv->subtype = SERIAL_TYPE_NORMAL;
1375 drv->init_termios = tty_std_termios;
1376 drv->init_termios.c_iflag = ICRNL;
1377 drv->init_termios.c_oflag = OPOST | ONLCR;
1378 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1379 drv->init_termios.c_lflag = 0;
1380 drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1381 tty_set_operations(drv, &capinc_ops);
1382 if (tty_register_driver(drv)) {
1383 put_tty_driver(drv);
1384 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1385 return -1;
1386 }
1387 capinc_tty_driver = drv;
1388 return 0;
1389 }
1390
1391 static void capinc_tty_exit(void)
1392 {
1393 struct tty_driver *drv = capinc_tty_driver;
1394 int retval;
1395 if ((retval = tty_unregister_driver(drv)))
1396 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1397 put_tty_driver(drv);
1398 }
1399
1400 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1401
1402 /* -------- /proc functions ----------------------------------------- */
1403
1404 /*
1405 * /proc/capi/capi20:
1406 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1407 */
1408 static int proc_capidev_read_proc(char *page, char **start, off_t off,
1409 int count, int *eof, void *data)
1410 {
1411 struct capidev *cdev;
1412 struct list_head *l;
1413 int len = 0;
1414
1415 read_lock(&capidev_list_lock);
1416 list_for_each(l, &capidev_list) {
1417 cdev = list_entry(l, struct capidev, list);
1418 len += sprintf(page+len, "0 %d %lu %lu %lu %lu\n",
1419 cdev->ap.applid,
1420 cdev->ap.nrecvctlpkt,
1421 cdev->ap.nrecvdatapkt,
1422 cdev->ap.nsentctlpkt,
1423 cdev->ap.nsentdatapkt);
1424 if (len <= off) {
1425 off -= len;
1426 len = 0;
1427 } else {
1428 if (len-off > count)
1429 goto endloop;
1430 }
1431 }
1432
1433 endloop:
1434 read_unlock(&capidev_list_lock);
1435 if (len < count)
1436 *eof = 1;
1437 if (len > count) len = count;
1438 if (len < 0) len = 0;
1439 return len;
1440 }
1441
1442 /*
1443 * /proc/capi/capi20ncci:
1444 * applid ncci
1445 */
1446 static int proc_capincci_read_proc(char *page, char **start, off_t off,
1447 int count, int *eof, void *data)
1448 {
1449 struct capidev *cdev;
1450 struct capincci *np;
1451 struct list_head *l;
1452 int len = 0;
1453
1454 read_lock(&capidev_list_lock);
1455 list_for_each(l, &capidev_list) {
1456 cdev = list_entry(l, struct capidev, list);
1457 for (np=cdev->nccis; np; np = np->next) {
1458 len += sprintf(page+len, "%d 0x%x\n",
1459 cdev->ap.applid,
1460 np->ncci);
1461 if (len <= off) {
1462 off -= len;
1463 len = 0;
1464 } else {
1465 if (len-off > count)
1466 goto endloop;
1467 }
1468 }
1469 }
1470 endloop:
1471 read_unlock(&capidev_list_lock);
1472 *start = page+off;
1473 if (len < count)
1474 *eof = 1;
1475 if (len>count) len = count;
1476 if (len<0) len = 0;
1477 return len;
1478 }
1479
1480 static struct procfsentries {
1481 char *name;
1482 mode_t mode;
1483 int (*read_proc)(char *page, char **start, off_t off,
1484 int count, int *eof, void *data);
1485 struct proc_dir_entry *procent;
1486 } procfsentries[] = {
1487 /* { "capi", S_IFDIR, 0 }, */
1488 { "capi/capi20", 0 , proc_capidev_read_proc },
1489 { "capi/capi20ncci", 0 , proc_capincci_read_proc },
1490 };
1491
1492 static void __init proc_init(void)
1493 {
1494 int nelem = ARRAY_SIZE(procfsentries);
1495 int i;
1496
1497 for (i=0; i < nelem; i++) {
1498 struct procfsentries *p = procfsentries + i;
1499 p->procent = create_proc_entry(p->name, p->mode, NULL);
1500 if (p->procent) p->procent->read_proc = p->read_proc;
1501 }
1502 }
1503
1504 static void __exit proc_exit(void)
1505 {
1506 int nelem = ARRAY_SIZE(procfsentries);
1507 int i;
1508
1509 for (i=nelem-1; i >= 0; i--) {
1510 struct procfsentries *p = procfsentries + i;
1511 if (p->procent) {
1512 remove_proc_entry(p->name, NULL);
1513 p->procent = NULL;
1514 }
1515 }
1516 }
1517
1518 /* -------- init function and module interface ---------------------- */
1519
1520
1521 static char rev[32];
1522
1523 static int __init capi_init(void)
1524 {
1525 char *p;
1526 char *compileinfo;
1527 int major_ret;
1528
1529 if ((p = strchr(revision, ':')) != 0 && p[1]) {
1530 strlcpy(rev, p + 2, sizeof(rev));
1531 if ((p = strchr(rev, '$')) != 0 && p > rev)
1532 *(p-1) = 0;
1533 } else
1534 strcpy(rev, "1.0");
1535
1536 major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1537 if (major_ret < 0) {
1538 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1539 return major_ret;
1540 }
1541 capi_class = class_create(THIS_MODULE, "capi");
1542 if (IS_ERR(capi_class)) {
1543 unregister_chrdev(capi_major, "capi20");
1544 return PTR_ERR(capi_class);
1545 }
1546
1547 device_create(capi_class, NULL, MKDEV(capi_major, 0), "capi");
1548
1549 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1550 if (capinc_tty_init() < 0) {
1551 device_destroy(capi_class, MKDEV(capi_major, 0));
1552 class_destroy(capi_class);
1553 unregister_chrdev(capi_major, "capi20");
1554 return -ENOMEM;
1555 }
1556 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1557
1558 proc_init();
1559
1560 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1561 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1562 compileinfo = " (middleware+capifs)";
1563 #else
1564 compileinfo = " (no capifs)";
1565 #endif
1566 #else
1567 compileinfo = " (no middleware)";
1568 #endif
1569 printk(KERN_NOTICE "capi20: Rev %s: started up with major %d%s\n",
1570 rev, capi_major, compileinfo);
1571
1572 return 0;
1573 }
1574
1575 static void __exit capi_exit(void)
1576 {
1577 proc_exit();
1578
1579 device_destroy(capi_class, MKDEV(capi_major, 0));
1580 class_destroy(capi_class);
1581 unregister_chrdev(capi_major, "capi20");
1582
1583 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1584 capinc_tty_exit();
1585 #endif
1586 printk(KERN_NOTICE "capi: Rev %s: unloaded\n", rev);
1587 }
1588
1589 module_init(capi_init);
1590 module_exit(capi_exit);
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