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[PATCH] TTY layer buffering revamp
[linux-2.6-block.git] / drivers / isdn / capi / capi.c
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1da177e4
LT		 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/config.h>
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/major.h>
17#include <linux/sched.h>
18#include <linux/slab.h>
19#include <linux/fcntl.h>
20#include <linux/fs.h>
21#include <linux/signal.h>
22#include <linux/mm.h>
23#include <linux/smp_lock.h>
24#include <linux/timer.h>
25#include <linux/wait.h>
26#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
27#include <linux/tty.h>
28#ifdef CONFIG_PPP
29#include <linux/netdevice.h>
30#include <linux/ppp_defs.h>
31#include <linux/if_ppp.h>
32#endif /* CONFIG_PPP */
33#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
34#include <linux/skbuff.h>
35#include <linux/proc_fs.h>
36#include <linux/poll.h>
37#include <linux/capi.h>
38#include <linux/kernelcapi.h>
39#include <linux/init.h>
40#include <linux/device.h>
41#include <linux/moduleparam.h>
42#include <linux/devfs_fs_kernel.h>
43#include <linux/isdn/capiutil.h>
44#include <linux/isdn/capicmd.h>
45#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
46#include "capifs.h"
47#endif
48
49static char *revision = "$Revision: 1.1.2.7 $";
50
51MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
52MODULE_AUTHOR("Carsten Paeth");
53MODULE_LICENSE("GPL");
54
55#undef _DEBUG_REFCOUNT /* alloc/free and open/close debug */
56#undef _DEBUG_TTYFUNCS /* call to tty_driver */
57#undef _DEBUG_DATAFLOW /* data flow */
58
59/* -------- driver information -------------------------------------- */
60
56b22935 61static struct class *capi_class;
1da177e4 62
408b664a 63static int capi_major = 68; /* allocated */
1da177e4
LT		 64#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
65#define CAPINC_NR_PORTS 32
66#define CAPINC_MAX_PORTS 256
408b664a
AB		 67static int capi_ttymajor = 191;
68static int capi_ttyminors = CAPINC_NR_PORTS;
1da177e4
LT		 69#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
70
71module_param_named(major, capi_major, uint, 0);
72#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
73module_param_named(ttymajor, capi_ttymajor, uint, 0);
74module_param_named(ttyminors, capi_ttyminors, uint, 0);
75#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
76
77/* -------- defines ------------------------------------------------- */
78
79#define CAPINC_MAX_RECVQUEUE 10
80#define CAPINC_MAX_SENDQUEUE 10
81#define CAPI_MAX_BLKSIZE 2048
82
83/* -------- data structures ----------------------------------------- */
84
85struct capidev;
86struct capincci;
87#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
88struct capiminor;
89
90struct capiminor {
91 struct list_head list;
92 struct capincci *nccip;
93 unsigned int minor;
94
95 struct capi20_appl *ap;
96 u32 ncci;
97 u16 datahandle;
98 u16 msgid;
99
100 struct tty_struct *tty;
101 int ttyinstop;
102 int ttyoutstop;
103 struct sk_buff *ttyskb;
104 atomic_t ttyopencount;
105
106 struct sk_buff_head inqueue;
107 int inbytes;
108 struct sk_buff_head outqueue;
109 int outbytes;
110
111 /* transmit path */
112 struct datahandle_queue {
113 struct datahandle_queue *next;
114 u16 datahandle;
115 } *ackqueue;
116 int nack;
117
118};
119#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
120
121struct capincci {
122 struct capincci *next;
123 u32 ncci;
124 struct capidev *cdev;
125#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
126 struct capiminor *minorp;
127#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
128};
129
130struct capidev {
131 struct list_head list;
132 struct capi20_appl ap;
133 u16 errcode;
134 unsigned userflags;
135
136 struct sk_buff_head recvqueue;
137 wait_queue_head_t recvwait;
138
139 struct capincci *nccis;
140
141 struct semaphore ncci_list_sem;
142};
143
144/* -------- global variables ---------------------------------------- */
145
146static DEFINE_RWLOCK(capidev_list_lock);
147static LIST_HEAD(capidev_list);
148
149#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
150static DEFINE_RWLOCK(capiminor_list_lock);
151static LIST_HEAD(capiminor_list);
152#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
153
154#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
155/* -------- datahandles --------------------------------------------- */
156
157static int capincci_add_ack(struct capiminor *mp, u16 datahandle)
158{
159 struct datahandle_queue *n, **pp;
160
161 n = kmalloc(sizeof(*n), GFP_ATOMIC);
162 if (!n) {
163 printk(KERN_ERR "capi: alloc datahandle failed\n");
164 return -1;
165 }
166 n->next = NULL;
167 n->datahandle = datahandle;
168 for (pp = &mp->ackqueue; *pp; pp = &(*pp)->next) ;
169 *pp = n;
170 mp->nack++;
171 return 0;
172}
173
174static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
175{
176 struct datahandle_queue **pp, *p;
177
178 for (pp = &mp->ackqueue; *pp; pp = &(*pp)->next) {
179 if ((*pp)->datahandle == datahandle) {
180 p = *pp;
181 *pp = (*pp)->next;
182 kfree(p);
183 mp->nack--;
184 return 0;
185 }
186 }
187 return -1;
188}
189
190static void capiminor_del_all_ack(struct capiminor *mp)
191{
192 struct datahandle_queue **pp, *p;
193
194 pp = &mp->ackqueue;
195 while (*pp) {
196 p = *pp;
197 *pp = (*pp)->next;
198 kfree(p);
199 mp->nack--;
200 }
201}
202
203
204/* -------- struct capiminor ---------------------------------------- */
205
206static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
207{
208 struct capiminor *mp, *p;
209 unsigned int minor = 0;
210 unsigned long flags;
211
212 mp = kmalloc(sizeof(*mp), GFP_ATOMIC);
213 if (!mp) {
214 printk(KERN_ERR "capi: can't alloc capiminor\n");
215 return NULL;
216 }
217
218 memset(mp, 0, sizeof(struct capiminor));
219 mp->ap = ap;
220 mp->ncci = ncci;
221 mp->msgid = 0;
222 atomic_set(&mp->ttyopencount,0);
223
224 skb_queue_head_init(&mp->inqueue);
225 skb_queue_head_init(&mp->outqueue);
226
227 /* Allocate the least unused minor number.
228 */
229 write_lock_irqsave(&capiminor_list_lock, flags);
230 if (list_empty(&capiminor_list))
231 list_add(&mp->list, &capiminor_list);
232 else {
233 list_for_each_entry(p, &capiminor_list, list) {
234 if (p->minor > minor)
235 break;
236 minor++;
237 }
238
239 if (minor < capi_ttyminors) {
240 mp->minor = minor;
241 list_add(&mp->list, p->list.prev);
242 }
243 }
244 write_unlock_irqrestore(&capiminor_list_lock, flags);
245
246 if (!(minor < capi_ttyminors)) {
247 printk(KERN_NOTICE "capi: out of minors\n");
248 kfree(mp);
249 return NULL;
250 }
251
252 return mp;
253}
254
255static void capiminor_free(struct capiminor *mp)
256{
257 unsigned long flags;
258
259 write_lock_irqsave(&capiminor_list_lock, flags);
260 list_del(&mp->list);
261 write_unlock_irqrestore(&capiminor_list_lock, flags);
262
263 if (mp->ttyskb) kfree_skb(mp->ttyskb);
264 mp->ttyskb = NULL;
265 skb_queue_purge(&mp->inqueue);
266 skb_queue_purge(&mp->outqueue);
267 capiminor_del_all_ack(mp);
268 kfree(mp);
269}
270
408b664a 271static struct capiminor *capiminor_find(unsigned int minor)
1da177e4
LT		 272{
273 struct list_head *l;
274 struct capiminor *p = NULL;
275
276 read_lock(&capiminor_list_lock);
277 list_for_each(l, &capiminor_list) {
278 p = list_entry(l, struct capiminor, list);
279 if (p->minor == minor)
280 break;
281 }
282 read_unlock(&capiminor_list_lock);
283 if (l == &capiminor_list)
284 return NULL;
285
286 return p;
287}
288#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
289
290/* -------- struct capincci ----------------------------------------- */
291
292static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
293{
294 struct capincci *np, **pp;
295#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
296 struct capiminor *mp = NULL;
297#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
298
299 np = kmalloc(sizeof(*np), GFP_ATOMIC);
300 if (!np)
301 return NULL;
302 memset(np, 0, sizeof(struct capincci));
303 np->ncci = ncci;
304 np->cdev = cdev;
305#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
306 mp = NULL;
307 if (cdev->userflags & CAPIFLAG_HIGHJACKING)
308 mp = np->minorp = capiminor_alloc(&cdev->ap, ncci);
309 if (mp) {
310 mp->nccip = np;
311#ifdef _DEBUG_REFCOUNT
312 printk(KERN_DEBUG "set mp->nccip\n");
313#endif
314#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
315 capifs_new_ncci(mp->minor, MKDEV(capi_ttymajor, mp->minor));
316#endif
317 }
318#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
319 for (pp=&cdev->nccis; *pp; pp = &(*pp)->next)
320 ;
321 *pp = np;
322 return np;
323}
324
325static void capincci_free(struct capidev *cdev, u32 ncci)
326{
327 struct capincci *np, **pp;
328#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
329 struct capiminor *mp;
330#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
331
332 pp=&cdev->nccis;
333 while (*pp) {
334 np = *pp;
335 if (ncci == 0xffffffff || np->ncci == ncci) {
336 *pp = (*pp)->next;
337#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
338 if ((mp = np->minorp) != 0) {
339#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
340 capifs_free_ncci(mp->minor);
341#endif
342 if (mp->tty) {
343 mp->nccip = NULL;
344#ifdef _DEBUG_REFCOUNT
345 printk(KERN_DEBUG "reset mp->nccip\n");
346#endif
347 tty_hangup(mp->tty);
348 } else {
349 capiminor_free(mp);
350 }
351 }
352#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
353 kfree(np);
354 if (*pp == 0) return;
355 } else {
356 pp = &(*pp)->next;
357 }
358 }
359}
360
361static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
362{
363 struct capincci *p;
364
365 for (p=cdev->nccis; p ; p = p->next) {
366 if (p->ncci == ncci)
367 break;
368 }
369 return p;
370}
371
372/* -------- struct capidev ------------------------------------------ */
373
374static struct capidev *capidev_alloc(void)
375{
376 struct capidev *cdev;
377 unsigned long flags;
378
379 cdev = kmalloc(sizeof(*cdev), GFP_KERNEL);
380 if (!cdev)
381 return NULL;
382 memset(cdev, 0, sizeof(struct capidev));
383
384 init_MUTEX(&cdev->ncci_list_sem);
385 skb_queue_head_init(&cdev->recvqueue);
386 init_waitqueue_head(&cdev->recvwait);
387 write_lock_irqsave(&capidev_list_lock, flags);
388 list_add_tail(&cdev->list, &capidev_list);
389 write_unlock_irqrestore(&capidev_list_lock, flags);
390 return cdev;
391}
392
393static void capidev_free(struct capidev *cdev)
394{
395 unsigned long flags;
396
397 if (cdev->ap.applid) {
398 capi20_release(&cdev->ap);
399 cdev->ap.applid = 0;
400 }
401 skb_queue_purge(&cdev->recvqueue);
402
403 down(&cdev->ncci_list_sem);
404 capincci_free(cdev, 0xffffffff);
405 up(&cdev->ncci_list_sem);
406
407 write_lock_irqsave(&capidev_list_lock, flags);
408 list_del(&cdev->list);
409 write_unlock_irqrestore(&capidev_list_lock, flags);
410 kfree(cdev);
411}
412
413#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
414/* -------- handle data queue --------------------------------------- */
415
416static struct sk_buff *
417gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
418{
419 struct sk_buff *nskb;
420 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
421 if (nskb) {
422 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
423 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
424 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
425 capimsg_setu16(s, 2, mp->ap->applid);
426 capimsg_setu8 (s, 4, CAPI_DATA_B3);
427 capimsg_setu8 (s, 5, CAPI_RESP);
428 capimsg_setu16(s, 6, mp->msgid++);
429 capimsg_setu32(s, 8, mp->ncci);
430 capimsg_setu16(s, 12, datahandle);
431 }
432 return nskb;
433}
434
435static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
436{
437 struct sk_buff *nskb;
438 int datalen;
439 u16 errcode, datahandle;
440 struct tty_ldisc *ld;
441
442 datalen = skb->len - CAPIMSG_LEN(skb->data);
443 if (mp->tty == NULL)
444 {
445#ifdef _DEBUG_DATAFLOW
446 printk(KERN_DEBUG "capi: currently no receiver\n");
447#endif
448 return -1;
449 }
450
451 ld = tty_ldisc_ref(mp->tty);
452 if (ld == NULL)
453 return -1;
454 if (ld->receive_buf == NULL) {
455#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
456 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
457#endif
458 goto bad;
459 }
460 if (mp->ttyinstop) {
461#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
462 printk(KERN_DEBUG "capi: recv tty throttled\n");
463#endif
464 goto bad;
465 }
33f0f88f 466 if (mp->tty->receive_room < datalen) {
1da177e4
LT		 467#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
468 printk(KERN_DEBUG "capi: no room in tty\n");
469#endif
470 goto bad;
471 }
472 if ((nskb = gen_data_b3_resp_for(mp, skb)) == 0) {
473 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
474 goto bad;
475 }
476 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
477 errcode = capi20_put_message(mp->ap, nskb);
478 if (errcode != CAPI_NOERROR) {
479 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
480 errcode);
481 kfree_skb(nskb);
482 goto bad;
483 }
484 (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
485#ifdef _DEBUG_DATAFLOW
486 printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
487 datahandle, skb->len);
488#endif
489 ld->receive_buf(mp->tty, skb->data, NULL, skb->len);
490 kfree_skb(skb);
491 tty_ldisc_deref(ld);
492 return 0;
493bad:
494 tty_ldisc_deref(ld);
495 return -1;
496}
497
498static void handle_minor_recv(struct capiminor *mp)
499{
500 struct sk_buff *skb;
501 while ((skb = skb_dequeue(&mp->inqueue)) != 0) {
502 unsigned int len = skb->len;
503 mp->inbytes -= len;
504 if (handle_recv_skb(mp, skb) < 0) {
505 skb_queue_head(&mp->inqueue, skb);
506 mp->inbytes += len;
507 return;
508 }
509 }
510}
511
512static int handle_minor_send(struct capiminor *mp)
513{
514 struct sk_buff *skb;
515 u16 len;
516 int count = 0;
517 u16 errcode;
518 u16 datahandle;
519
520 if (mp->tty && mp->ttyoutstop) {
521#if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
522 printk(KERN_DEBUG "capi: send: tty stopped\n");
523#endif
524 return 0;
525 }
526
527 while ((skb = skb_dequeue(&mp->outqueue)) != 0) {
528 datahandle = mp->datahandle;
529 len = (u16)skb->len;
530 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
531 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
532 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
533 capimsg_setu16(skb->data, 2, mp->ap->applid);
534 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
535 capimsg_setu8 (skb->data, 5, CAPI_REQ);
536 capimsg_setu16(skb->data, 6, mp->msgid++);
537 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
538 capimsg_setu32(skb->data, 12, (u32) skb->data); /* Data32 */
539 capimsg_setu16(skb->data, 16, len); /* Data length */
540 capimsg_setu16(skb->data, 18, datahandle);
541 capimsg_setu16(skb->data, 20, 0); /* Flags */
542
543 if (capincci_add_ack(mp, datahandle) < 0) {
544 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
545 skb_queue_head(&mp->outqueue, skb);
546 return count;
547 }
548 errcode = capi20_put_message(mp->ap, skb);
549 if (errcode == CAPI_NOERROR) {
550 mp->datahandle++;
551 count++;
552 mp->outbytes -= len;
553#ifdef _DEBUG_DATAFLOW
554 printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
555 datahandle, len);
556#endif
557 continue;
558 }
559 capiminor_del_ack(mp, datahandle);
560
561 if (errcode == CAPI_SENDQUEUEFULL) {
562 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
563 skb_queue_head(&mp->outqueue, skb);
564 break;
565 }
566
567 /* ups, drop packet */
568 printk(KERN_ERR "capi: put_message = %x\n", errcode);
569 mp->outbytes -= len;
570 kfree_skb(skb);
571 }
572 return count;
573}
574
575#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
576/* -------- function called by lower level -------------------------- */
577
578static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
579{
580 struct capidev *cdev = ap->private;
581#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
582 struct capiminor *mp;
583 u16 datahandle;
584#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
585 struct capincci *np;
586 u32 ncci;
587
588 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
589 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
590 if (info == 0) {
591 down(&cdev->ncci_list_sem);
592 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
593 up(&cdev->ncci_list_sem);
594 }
595 }
596 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
597 down(&cdev->ncci_list_sem);
598 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
599 up(&cdev->ncci_list_sem);
600 }
601 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
602 skb_queue_tail(&cdev->recvqueue, skb);
603 wake_up_interruptible(&cdev->recvwait);
604 return;
605 }
606 ncci = CAPIMSG_CONTROL(skb->data);
607 for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
608 ;
609 if (!np) {
610 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
611 skb_queue_tail(&cdev->recvqueue, skb);
612 wake_up_interruptible(&cdev->recvwait);
613 return;
614 }
615#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
616 skb_queue_tail(&cdev->recvqueue, skb);
617 wake_up_interruptible(&cdev->recvwait);
618#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
619 mp = np->minorp;
620 if (!mp) {
621 skb_queue_tail(&cdev->recvqueue, skb);
622 wake_up_interruptible(&cdev->recvwait);
623 return;
624 }
625
626
627 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
628
629 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
630#ifdef _DEBUG_DATAFLOW
631 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
632 datahandle, skb->len-CAPIMSG_LEN(skb->data));
633#endif
634 skb_queue_tail(&mp->inqueue, skb);
635 mp->inbytes += skb->len;
636 handle_minor_recv(mp);
637
638 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
639
640 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
641#ifdef _DEBUG_DATAFLOW
642 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
643 datahandle,
644 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
645#endif
646 kfree_skb(skb);
647 (void)capiminor_del_ack(mp, datahandle);
648 if (mp->tty)
649 tty_wakeup(mp->tty);
650 (void)handle_minor_send(mp);
651
652 } else {
653 /* ups, let capi application handle it :-) */
654 skb_queue_tail(&cdev->recvqueue, skb);
655 wake_up_interruptible(&cdev->recvwait);
656 }
657#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
658}
659
660/* -------- file_operations for capidev ----------------------------- */
661
662static ssize_t
663capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
664{
665 struct capidev *cdev = (struct capidev *)file->private_data;
666 struct sk_buff *skb;
667 size_t copied;
668
669 if (!cdev->ap.applid)
670 return -ENODEV;
671
672 if ((skb = skb_dequeue(&cdev->recvqueue)) == 0) {
673
674 if (file->f_flags & O_NONBLOCK)
675 return -EAGAIN;
676
677 for (;;) {
678 interruptible_sleep_on(&cdev->recvwait);
679 if ((skb = skb_dequeue(&cdev->recvqueue)) != 0)
680 break;
681 if (signal_pending(current))
682 break;
683 }
684 if (skb == 0)
685 return -ERESTARTNOHAND;
686 }
687 if (skb->len > count) {
688 skb_queue_head(&cdev->recvqueue, skb);
689 return -EMSGSIZE;
690 }
691 if (copy_to_user(buf, skb->data, skb->len)) {
692 skb_queue_head(&cdev->recvqueue, skb);
693 return -EFAULT;
694 }
695 copied = skb->len;
696
697 kfree_skb(skb);
698
699 return copied;
700}
701
702static ssize_t
703capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
704{
705 struct capidev *cdev = (struct capidev *)file->private_data;
706 struct sk_buff *skb;
707 u16 mlen;
708
709 if (!cdev->ap.applid)
710 return -ENODEV;
711
712 skb = alloc_skb(count, GFP_USER);
713 if (!skb)
714 return -ENOMEM;
715
716 if (copy_from_user(skb_put(skb, count), buf, count)) {
717 kfree_skb(skb);
718 return -EFAULT;
719 }
720 mlen = CAPIMSG_LEN(skb->data);
721 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
722 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
723 kfree_skb(skb);
724 return -EINVAL;
725 }
726 } else {
727 if (mlen != count) {
728 kfree_skb(skb);
729 return -EINVAL;
730 }
731 }
732 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
733
734 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
735 down(&cdev->ncci_list_sem);
736 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
737 up(&cdev->ncci_list_sem);
738 }
739
740 cdev->errcode = capi20_put_message(&cdev->ap, skb);
741
742 if (cdev->errcode) {
743 kfree_skb(skb);
744 return -EIO;
745 }
746 return count;
747}
748
749static unsigned int
750capi_poll(struct file *file, poll_table * wait)
751{
752 struct capidev *cdev = (struct capidev *)file->private_data;
753 unsigned int mask = 0;
754
755 if (!cdev->ap.applid)
756 return POLLERR;
757
758 poll_wait(file, &(cdev->recvwait), wait);
759 mask = POLLOUT | POLLWRNORM;
760 if (!skb_queue_empty(&cdev->recvqueue))
761 mask |= POLLIN | POLLRDNORM;
762 return mask;
763}
764
765static int
766capi_ioctl(struct inode *inode, struct file *file,
767 unsigned int cmd, unsigned long arg)
768{
769 struct capidev *cdev = file->private_data;
770 struct capi20_appl *ap = &cdev->ap;
771 capi_ioctl_struct data;
772 int retval = -EINVAL;
773 void __user *argp = (void __user *)arg;
774
775 switch (cmd) {
776 case CAPI_REGISTER:
777 {
778 if (ap->applid)
779 return -EEXIST;
780
781 if (copy_from_user(&cdev->ap.rparam, argp,
782 sizeof(struct capi_register_params)))
783 return -EFAULT;
784
785 cdev->ap.private = cdev;
786 cdev->ap.recv_message = capi_recv_message;
787 cdev->errcode = capi20_register(ap);
788 if (cdev->errcode) {
789 ap->applid = 0;
790 return -EIO;
791 }
792 }
793 return (int)ap->applid;
794
795 case CAPI_GET_VERSION:
796 {
797 if (copy_from_user(&data.contr, argp,
798 sizeof(data.contr)))
799 return -EFAULT;
800 cdev->errcode = capi20_get_version(data.contr, &data.version);
801 if (cdev->errcode)
802 return -EIO;
803 if (copy_to_user(argp, &data.version,
804 sizeof(data.version)))
805 return -EFAULT;
806 }
807 return 0;
808
809 case CAPI_GET_SERIAL:
810 {
811 if (copy_from_user(&data.contr, argp,
812 sizeof(data.contr)))
813 return -EFAULT;
814 cdev->errcode = capi20_get_serial (data.contr, data.serial);
815 if (cdev->errcode)
816 return -EIO;
817 if (copy_to_user(argp, data.serial,
818 sizeof(data.serial)))
819 return -EFAULT;
820 }
821 return 0;
822 case CAPI_GET_PROFILE:
823 {
824 if (copy_from_user(&data.contr, argp,
825 sizeof(data.contr)))
826 return -EFAULT;
827
828 if (data.contr == 0) {
829 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
830 if (cdev->errcode)
831 return -EIO;
832
833 retval = copy_to_user(argp,
834 &data.profile.ncontroller,
835 sizeof(data.profile.ncontroller));
836
837 } else {
838 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
839 if (cdev->errcode)
840 return -EIO;
841
842 retval = copy_to_user(argp, &data.profile,
843 sizeof(data.profile));
844 }
845 if (retval)
846 return -EFAULT;
847 }
848 return 0;
849
850 case CAPI_GET_MANUFACTURER:
851 {
852 if (copy_from_user(&data.contr, argp,
853 sizeof(data.contr)))
854 return -EFAULT;
855 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
856 if (cdev->errcode)
857 return -EIO;
858
859 if (copy_to_user(argp, data.manufacturer,
860 sizeof(data.manufacturer)))
861 return -EFAULT;
862
863 }
864 return 0;
865 case CAPI_GET_ERRCODE:
866 data.errcode = cdev->errcode;
867 cdev->errcode = CAPI_NOERROR;
868 if (arg) {
869 if (copy_to_user(argp, &data.errcode,
870 sizeof(data.errcode)))
871 return -EFAULT;
872 }
873 return data.errcode;
874
875 case CAPI_INSTALLED:
876 if (capi20_isinstalled() == CAPI_NOERROR)
877 return 0;
878 return -ENXIO;
879
880 case CAPI_MANUFACTURER_CMD:
881 {
882 struct capi_manufacturer_cmd mcmd;
883 if (!capable(CAP_SYS_ADMIN))
884 return -EPERM;
885 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
886 return -EFAULT;
887 return capi20_manufacturer(mcmd.cmd, mcmd.data);
888 }
889 return 0;
890
891 case CAPI_SET_FLAGS:
892 case CAPI_CLR_FLAGS:
893 {
894 unsigned userflags;
895 if (copy_from_user(&userflags, argp,
896 sizeof(userflags)))
897 return -EFAULT;
898 if (cmd == CAPI_SET_FLAGS)
899 cdev->userflags |= userflags;
900 else
901 cdev->userflags &= ~userflags;
902 }
903 return 0;
904
905 case CAPI_GET_FLAGS:
906 if (copy_to_user(argp, &cdev->userflags,
907 sizeof(cdev->userflags)))
908 return -EFAULT;
909 return 0;
910
911 case CAPI_NCCI_OPENCOUNT:
912 {
913 struct capincci *nccip;
914#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
915 struct capiminor *mp;
916#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
917 unsigned ncci;
918 int count = 0;
919 if (copy_from_user(&ncci, argp, sizeof(ncci)))
920 return -EFAULT;
921
922 down(&cdev->ncci_list_sem);
923 if ((nccip = capincci_find(cdev, (u32) ncci)) == 0) {
924 up(&cdev->ncci_list_sem);
925 return 0;
926 }
927#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
928 if ((mp = nccip->minorp) != 0) {
929 count += atomic_read(&mp->ttyopencount);
930 }
931#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
932 up(&cdev->ncci_list_sem);
933 return count;
934 }
935 return 0;
936
937#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
938 case CAPI_NCCI_GETUNIT:
939 {
940 struct capincci *nccip;
941 struct capiminor *mp;
942 unsigned ncci;
943 int unit = 0;
944 if (copy_from_user(&ncci, argp,
945 sizeof(ncci)))
946 return -EFAULT;
947 down(&cdev->ncci_list_sem);
948 nccip = capincci_find(cdev, (u32) ncci);
949 if (!nccip || (mp = nccip->minorp) == 0) {
950 up(&cdev->ncci_list_sem);
951 return -ESRCH;
952 }
953 unit = mp->minor;
954 up(&cdev->ncci_list_sem);
955 return unit;
956 }
957 return 0;
958#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
959 }
960 return -EINVAL;
961}
962
963static int
964capi_open(struct inode *inode, struct file *file)
965{
966 if (file->private_data)
967 return -EEXIST;
968
969 if ((file->private_data = capidev_alloc()) == 0)
970 return -ENOMEM;
971
972 return nonseekable_open(inode, file);
973}
974
975static int
976capi_release(struct inode *inode, struct file *file)
977{
978 struct capidev *cdev = (struct capidev *)file->private_data;
979
980 capidev_free(cdev);
981 file->private_data = NULL;
982
983 return 0;
984}
985
986static struct file_operations capi_fops =
987{
988 .owner = THIS_MODULE,
989 .llseek = no_llseek,
990 .read = capi_read,
991 .write = capi_write,
992 .poll = capi_poll,
993 .ioctl = capi_ioctl,
994 .open = capi_open,
995 .release = capi_release,
996};
997
998#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
999/* -------- tty_operations for capincci ----------------------------- */
1000
1001static int capinc_tty_open(struct tty_struct * tty, struct file * file)
1002{
1003 struct capiminor *mp;
1004
1005 if ((mp = capiminor_find(iminor(file->f_dentry->d_inode))) == 0)
1006 return -ENXIO;
1007 if (mp->nccip == 0)
1008 return -ENXIO;
1009
1010 tty->driver_data = (void *)mp;
1011
1012 if (atomic_read(&mp->ttyopencount) == 0)
1013 mp->tty = tty;
1014 atomic_inc(&mp->ttyopencount);
1015#ifdef _DEBUG_REFCOUNT
1016 printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1017#endif
1018 handle_minor_recv(mp);
1019 return 0;
1020}
1021
1022static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1023{
1024 struct capiminor *mp;
1025
1026 mp = (struct capiminor *)tty->driver_data;
1027 if (mp) {
1028 if (atomic_dec_and_test(&mp->ttyopencount)) {
1029#ifdef _DEBUG_REFCOUNT
1030 printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1031#endif
1032 tty->driver_data = NULL;
1033 mp->tty = NULL;
1034 }
1035#ifdef _DEBUG_REFCOUNT
1036 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1037#endif
1038 if (mp->nccip == 0)
1039 capiminor_free(mp);
1040 }
1041
1042#ifdef _DEBUG_REFCOUNT
1043 printk(KERN_DEBUG "capinc_tty_close\n");
1044#endif
1045}
1046
1047static int capinc_tty_write(struct tty_struct * tty,
1048 const unsigned char *buf, int count)
1049{
1050 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1051 struct sk_buff *skb;
1052
1053#ifdef _DEBUG_TTYFUNCS
1054 printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1055#endif
1056
1057 if (!mp || !mp->nccip) {
1058#ifdef _DEBUG_TTYFUNCS
1059 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1060#endif
1061 return 0;
1062 }
1063
1064 skb = mp->ttyskb;
1065 if (skb) {
1066 mp->ttyskb = NULL;
1067 skb_queue_tail(&mp->outqueue, skb);
1068 mp->outbytes += skb->len;
1069 }
1070
1071 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1072 if (!skb) {
1073 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1074 return -ENOMEM;
1075 }
1076
1077 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1078 memcpy(skb_put(skb, count), buf, count);
1079
1080 skb_queue_tail(&mp->outqueue, skb);
1081 mp->outbytes += skb->len;
1082 (void)handle_minor_send(mp);
1083 (void)handle_minor_recv(mp);
1084 return count;
1085}
1086
1087static void capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1088{
1089 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1090 struct sk_buff *skb;
1091
1092#ifdef _DEBUG_TTYFUNCS
1093 printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1094#endif
1095
1096 if (!mp || !mp->nccip) {
1097#ifdef _DEBUG_TTYFUNCS
1098 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1099#endif
1100 return;
1101 }
1102
1103 skb = mp->ttyskb;
1104 if (skb) {
1105 if (skb_tailroom(skb) > 0) {
1106 *(skb_put(skb, 1)) = ch;
1107 return;
1108 }
1109 mp->ttyskb = NULL;
1110 skb_queue_tail(&mp->outqueue, skb);
1111 mp->outbytes += skb->len;
1112 (void)handle_minor_send(mp);
1113 }
1114 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1115 if (skb) {
1116 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1117 *(skb_put(skb, 1)) = ch;
1118 mp->ttyskb = skb;
1119 } else {
1120 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1121 }
1122}
1123
1124static void capinc_tty_flush_chars(struct tty_struct *tty)
1125{
1126 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1127 struct sk_buff *skb;
1128
1129#ifdef _DEBUG_TTYFUNCS
1130 printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1131#endif
1132
1133 if (!mp || !mp->nccip) {
1134#ifdef _DEBUG_TTYFUNCS
1135 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1136#endif
1137 return;
1138 }
1139
1140 skb = mp->ttyskb;
1141 if (skb) {
1142 mp->ttyskb = NULL;
1143 skb_queue_tail(&mp->outqueue, skb);
1144 mp->outbytes += skb->len;
1145 (void)handle_minor_send(mp);
1146 }
1147 (void)handle_minor_recv(mp);
1148}
1149
1150static int capinc_tty_write_room(struct tty_struct *tty)
1151{
1152 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1153 int room;
1154 if (!mp || !mp->nccip) {
1155#ifdef _DEBUG_TTYFUNCS
1156 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1157#endif
1158 return 0;
1159 }
1160 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1161 room *= CAPI_MAX_BLKSIZE;
1162#ifdef _DEBUG_TTYFUNCS
1163 printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1164#endif
1165 return room;
1166}
1167
408b664a 1168static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1da177e4
LT		 1169{
1170 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1171 if (!mp || !mp->nccip) {
1172#ifdef _DEBUG_TTYFUNCS
1173 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1174#endif
1175 return 0;
1176 }
1177#ifdef _DEBUG_TTYFUNCS
1178 printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1179 mp->outbytes, mp->nack,
1180 skb_queue_len(&mp->outqueue),
1181 skb_queue_len(&mp->inqueue));
1182#endif
1183 return mp->outbytes;
1184}
1185
1186static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1187 unsigned int cmd, unsigned long arg)
1188{
1189 int error = 0;
1190 switch (cmd) {
1191 default:
1192 error = n_tty_ioctl (tty, file, cmd, arg);
1193 break;
1194 }
1195 return error;
1196}
1197
1198static void capinc_tty_set_termios(struct tty_struct *tty, struct termios * old)
1199{
1200#ifdef _DEBUG_TTYFUNCS
1201 printk(KERN_DEBUG "capinc_tty_set_termios\n");
1202#endif
1203}
1204
1205static void capinc_tty_throttle(struct tty_struct * tty)
1206{
1207 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1208#ifdef _DEBUG_TTYFUNCS
1209 printk(KERN_DEBUG "capinc_tty_throttle\n");
1210#endif
1211 if (mp)
1212 mp->ttyinstop = 1;
1213}
1214
1215static void capinc_tty_unthrottle(struct tty_struct * tty)
1216{
1217 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1218#ifdef _DEBUG_TTYFUNCS
1219 printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1220#endif
1221 if (mp) {
1222 mp->ttyinstop = 0;
1223 handle_minor_recv(mp);
1224 }
1225}
1226
1227static void capinc_tty_stop(struct tty_struct *tty)
1228{
1229 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1230#ifdef _DEBUG_TTYFUNCS
1231 printk(KERN_DEBUG "capinc_tty_stop\n");
1232#endif
1233 if (mp) {
1234 mp->ttyoutstop = 1;
1235 }
1236}
1237
1238static void capinc_tty_start(struct tty_struct *tty)
1239{
1240 struct capiminor *mp = (struct capiminor *)tty->driver_data;
1241#ifdef _DEBUG_TTYFUNCS
1242 printk(KERN_DEBUG "capinc_tty_start\n");
1243#endif
1244 if (mp) {
1245 mp->ttyoutstop = 0;
1246 (void)handle_minor_send(mp);
1247 }
1248}
1249
1250static void capinc_tty_hangup(struct tty_struct *tty)
1251{
1252#ifdef _DEBUG_TTYFUNCS
1253 printk(KERN_DEBUG "capinc_tty_hangup\n");
1254#endif
1255}
1256
1257static void capinc_tty_break_ctl(struct tty_struct *tty, int state)
1258{
1259#ifdef _DEBUG_TTYFUNCS
1260 printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1261#endif
1262}
1263
1264static void capinc_tty_flush_buffer(struct tty_struct *tty)
1265{
1266#ifdef _DEBUG_TTYFUNCS
1267 printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1268#endif
1269}
1270
1271static void capinc_tty_set_ldisc(struct tty_struct *tty)
1272{
1273#ifdef _DEBUG_TTYFUNCS
1274 printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1275#endif
1276}
1277
1278static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1279{
1280#ifdef _DEBUG_TTYFUNCS
1281 printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1282#endif
1283}
1284
1285static int capinc_tty_read_proc(char *page, char **start, off_t off,
1286 int count, int *eof, void *data)
1287{
1288 return 0;
1289}
1290
1291static struct tty_driver *capinc_tty_driver;
1292
1293static struct tty_operations capinc_ops = {
1294 .open = capinc_tty_open,
1295 .close = capinc_tty_close,
1296 .write = capinc_tty_write,
1297 .put_char = capinc_tty_put_char,
1298 .flush_chars = capinc_tty_flush_chars,
1299 .write_room = capinc_tty_write_room,
1300 .chars_in_buffer = capinc_tty_chars_in_buffer,
1301 .ioctl = capinc_tty_ioctl,
1302 .set_termios = capinc_tty_set_termios,
1303 .throttle = capinc_tty_throttle,
1304 .unthrottle = capinc_tty_unthrottle,
1305 .stop = capinc_tty_stop,
1306 .start = capinc_tty_start,
1307 .hangup = capinc_tty_hangup,
1308 .break_ctl = capinc_tty_break_ctl,
1309 .flush_buffer = capinc_tty_flush_buffer,
1310 .set_ldisc = capinc_tty_set_ldisc,
1311 .send_xchar = capinc_tty_send_xchar,
1312 .read_proc = capinc_tty_read_proc,
1313};
1314
1315static int capinc_tty_init(void)
1316{
1317 struct tty_driver *drv;
1318
1319 if (capi_ttyminors > CAPINC_MAX_PORTS)
1320 capi_ttyminors = CAPINC_MAX_PORTS;
1321 if (capi_ttyminors <= 0)
1322 capi_ttyminors = CAPINC_NR_PORTS;
1323
1324 drv = alloc_tty_driver(capi_ttyminors);
1325 if (!drv)
1326 return -ENOMEM;
1327
1328 drv->owner = THIS_MODULE;
1329 drv->driver_name = "capi_nc";
1330 drv->devfs_name = "capi/";
1331 drv->name = "capi";
1332 drv->major = capi_ttymajor;
1333 drv->minor_start = 0;
1334 drv->type = TTY_DRIVER_TYPE_SERIAL;
1335 drv->subtype = SERIAL_TYPE_NORMAL;
1336 drv->init_termios = tty_std_termios;
1337 drv->init_termios.c_iflag = ICRNL;
1338 drv->init_termios.c_oflag = OPOST | ONLCR;
1339 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1340 drv->init_termios.c_lflag = 0;
1341 drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1342 tty_set_operations(drv, &capinc_ops);
1343 if (tty_register_driver(drv)) {
1344 put_tty_driver(drv);
1345 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1346 return -1;
1347 }
1348 capinc_tty_driver = drv;
1349 return 0;
1350}
1351
1352static void capinc_tty_exit(void)
1353{
1354 struct tty_driver *drv = capinc_tty_driver;
1355 int retval;
1356 if ((retval = tty_unregister_driver(drv)))
1357 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1358 put_tty_driver(drv);
1359}
1360
1361#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1362
1363/* -------- /proc functions ----------------------------------------- */
1364
1365/*
1366 * /proc/capi/capi20:
1367 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1368 */
1369static int proc_capidev_read_proc(char *page, char **start, off_t off,
1370 int count, int *eof, void *data)
1371{
1372 struct capidev *cdev;
1373 struct list_head *l;
1374 int len = 0;
1375
1376 read_lock(&capidev_list_lock);
1377 list_for_each(l, &capidev_list) {
1378 cdev = list_entry(l, struct capidev, list);
1379 len += sprintf(page+len, "0 %d %lu %lu %lu %lu\n",
1380 cdev->ap.applid,
1381 cdev->ap.nrecvctlpkt,
1382 cdev->ap.nrecvdatapkt,
1383 cdev->ap.nsentctlpkt,
1384 cdev->ap.nsentdatapkt);
1385 if (len <= off) {
1386 off -= len;
1387 len = 0;
1388 } else {
1389 if (len-off > count)
1390 goto endloop;
1391 }
1392 }
1393
1394endloop:
1395 read_unlock(&capidev_list_lock);
1396 if (len < count)
1397 *eof = 1;
1398 if (len > count) len = count;
1399 if (len < 0) len = 0;
1400 return len;
1401}
1402
1403/*
1404 * /proc/capi/capi20ncci:
1405 * applid ncci
1406 */
1407static int proc_capincci_read_proc(char *page, char **start, off_t off,
1408 int count, int *eof, void *data)
1409{
1410 struct capidev *cdev;
1411 struct capincci *np;
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 for (np=cdev->nccis; np; np = np->next) {
1419 len += sprintf(page+len, "%d 0x%x\n",
1420 cdev->ap.applid,
1421 np->ncci);
1422 if (len <= off) {
1423 off -= len;
1424 len = 0;
1425 } else {
1426 if (len-off > count)
1427 goto endloop;
1428 }
1429 }
1430 }
1431endloop:
1432 read_unlock(&capidev_list_lock);
1433 *start = page+off;
1434 if (len < count)
1435 *eof = 1;
1436 if (len>count) len = count;
1437 if (len<0) len = 0;
1438 return len;
1439}
1440
1441static struct procfsentries {
1442 char *name;
1443 mode_t mode;
1444 int (*read_proc)(char *page, char **start, off_t off,
1445 int count, int *eof, void *data);
1446 struct proc_dir_entry *procent;
1447} procfsentries[] = {
1448 /* { "capi", S_IFDIR, 0 }, */
1449 { "capi/capi20", 0 , proc_capidev_read_proc },
1450 { "capi/capi20ncci", 0 , proc_capincci_read_proc },
1451};
1452
1453static void __init proc_init(void)
1454{
1455 int nelem = sizeof(procfsentries)/sizeof(procfsentries[0]);
1456 int i;
1457
1458 for (i=0; i < nelem; i++) {
1459 struct procfsentries *p = procfsentries + i;
1460 p->procent = create_proc_entry(p->name, p->mode, NULL);
1461 if (p->procent) p->procent->read_proc = p->read_proc;
1462 }
1463}
1464
1465static void __exit proc_exit(void)
1466{
1467 int nelem = sizeof(procfsentries)/sizeof(procfsentries[0]);
1468 int i;
1469
1470 for (i=nelem-1; i >= 0; i--) {
1471 struct procfsentries *p = procfsentries + i;
1472 if (p->procent) {
1473 remove_proc_entry(p->name, NULL);
1474 p->procent = NULL;
1475 }
1476 }
1477}
1478
1479/* -------- init function and module interface ---------------------- */
1480
1481
1482static char rev[32];
1483
1484static int __init capi_init(void)
1485{
1486 char *p;
1487 char *compileinfo;
1488
1489 if ((p = strchr(revision, ':')) != 0 && p[1]) {
1490 strlcpy(rev, p + 2, sizeof(rev));
1491 if ((p = strchr(rev, '$')) != 0 && p > rev)
1492 *(p-1) = 0;
1493 } else
1494 strcpy(rev, "1.0");
1495
1496 if (register_chrdev(capi_major, "capi20", &capi_fops)) {
1497 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1498 return -EIO;
1499 }
1500
56b22935 1501 capi_class = class_create(THIS_MODULE, "capi");
1da177e4
LT		 1502 if (IS_ERR(capi_class)) {
1503 unregister_chrdev(capi_major, "capi20");
1504 return PTR_ERR(capi_class);
1505 }
1506
53f46542 1507 class_device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1da177e4
LT		 1508 devfs_mk_cdev(MKDEV(capi_major, 0), S_IFCHR | S_IRUSR | S_IWUSR,
1509 "isdn/capi20");
1510
1511#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1512 if (capinc_tty_init() < 0) {
56b22935 1513 class_device_destroy(capi_class, MKDEV(capi_major, 0));
1514 class_destroy(capi_class);
1da177e4
LT		 1515 unregister_chrdev(capi_major, "capi20");
1516 return -ENOMEM;
1517 }
1518#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1519
1520 proc_init();
1521
1522#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1523#if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1524 compileinfo = " (middleware+capifs)";
1525#else
1526 compileinfo = " (no capifs)";
1527#endif
1528#else
1529 compileinfo = " (no middleware)";
1530#endif
1531 printk(KERN_NOTICE "capi20: Rev %s: started up with major %d%s\n",
1532 rev, capi_major, compileinfo);
1533
1534 return 0;
1535}
1536
1537static void __exit capi_exit(void)
1538{
1539 proc_exit();
1540
56b22935 1541 class_device_destroy(capi_class, MKDEV(capi_major, 0));
1542 class_destroy(capi_class);
1da177e4
LT		 1543 unregister_chrdev(capi_major, "capi20");
1544 devfs_remove("isdn/capi20");
1545
1546#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1547 capinc_tty_exit();
1548#endif
1549 printk(KERN_NOTICE "capi: Rev %s: unloaded\n", rev);
1550}
1551
1552module_init(capi_init);
1553module_exit(capi_exit);
Linux 6.x block layer and io_uring tree(s)