1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
2  *
3  * CAPI 2.0 Interface for Linux
4  *
5  * Copyright 1996 by Carsten Paeth <calle@calle.de>
6  *
7  * This software may be used and distributed according to the terms
8  * of the GNU General Public License, incorporated herein by reference.
9  *
10  */
11 
12 #include <linux/compiler.h>
13 #include <linux/module.h>
14 #include <linux/ethtool.h>
15 #include <linux/errno.h>
16 #include <linux/kernel.h>
17 #include <linux/major.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/fcntl.h>
21 #include <linux/fs.h>
22 #include <linux/signal.h>
23 #include <linux/mutex.h>
24 #include <linux/mm.h>
25 #include <linux/timer.h>
26 #include <linux/wait.h>
27 #include <linux/tty.h>
28 #include <linux/netdevice.h>
29 #include <linux/ppp_defs.h>
30 #include <linux/ppp-ioctl.h>
31 #include <linux/skbuff.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/poll.h>
35 #include <linux/capi.h>
36 #include <linux/kernelcapi.h>
37 #include <linux/init.h>
38 #include <linux/device.h>
39 #include <linux/moduleparam.h>
40 #include <linux/isdn/capiutil.h>
41 #include <linux/isdn/capicmd.h>
42 
43 #include "kcapi.h"
44 
45 MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface");
46 MODULE_AUTHOR("Carsten Paeth");
47 MODULE_LICENSE("GPL");
48 
49 /* -------- driver information -------------------------------------- */
50 
51 static DEFINE_MUTEX(capi_mutex);
52 static const struct class capi_class = {
53 	.name = "capi",
54 };
55 static int capi_major = 68;		/* allocated */
56 
57 module_param_named(major, capi_major, uint, 0);
58 
59 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
60 #define CAPINC_NR_PORTS		32
61 #define CAPINC_MAX_PORTS	256
62 
63 static int capi_ttyminors = CAPINC_NR_PORTS;
64 
65 module_param_named(ttyminors, capi_ttyminors, uint, 0);
66 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
67 
68 /* -------- defines ------------------------------------------------- */
69 
70 #define CAPINC_MAX_RECVQUEUE	10
71 #define CAPINC_MAX_SENDQUEUE	10
72 #define CAPI_MAX_BLKSIZE	2048
73 
74 /* -------- data structures ----------------------------------------- */
75 
76 struct capidev;
77 struct capincci;
78 struct capiminor;
79 
80 struct ackqueue_entry {
81 	struct list_head	list;
82 	u16			datahandle;
83 };
84 
85 struct capiminor {
86 	unsigned int      minor;
87 
88 	struct capi20_appl	*ap;
89 	u32			ncci;
90 	atomic_t		datahandle;
91 	atomic_t		msgid;
92 
93 	struct tty_port port;
94 	int                ttyinstop;
95 	int                ttyoutstop;
96 
97 	struct sk_buff_head	inqueue;
98 
99 	struct sk_buff_head	outqueue;
100 	int			outbytes;
101 	struct sk_buff		*outskb;
102 	spinlock_t		outlock;
103 
104 	/* transmit path */
105 	struct list_head ackqueue;
106 	int nack;
107 	spinlock_t ackqlock;
108 };
109 
110 struct capincci {
111 	struct list_head list;
112 	u32		 ncci;
113 	struct capidev	*cdev;
114 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
115 	struct capiminor *minorp;
116 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
117 };
118 
119 struct capidev {
120 	struct list_head list;
121 	struct capi20_appl ap;
122 	u16		errcode;
123 	unsigned        userflags;
124 
125 	struct sk_buff_head recvqueue;
126 	wait_queue_head_t recvwait;
127 
128 	struct list_head nccis;
129 
130 	struct mutex lock;
131 };
132 
133 /* -------- global variables ---------------------------------------- */
134 
135 static DEFINE_MUTEX(capidev_list_lock);
136 static LIST_HEAD(capidev_list);
137 
138 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
139 
140 static DEFINE_SPINLOCK(capiminors_lock);
141 static struct capiminor **capiminors;
142 
143 static struct tty_driver *capinc_tty_driver;
144 
145 /* -------- datahandles --------------------------------------------- */
146 
capiminor_add_ack(struct capiminor * mp,u16 datahandle)147 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
148 {
149 	struct ackqueue_entry *n;
150 
151 	n = kmalloc(sizeof(*n), GFP_ATOMIC);
152 	if (unlikely(!n)) {
153 		printk(KERN_ERR "capi: alloc datahandle failed\n");
154 		return -1;
155 	}
156 	n->datahandle = datahandle;
157 	INIT_LIST_HEAD(&n->list);
158 	spin_lock_bh(&mp->ackqlock);
159 	list_add_tail(&n->list, &mp->ackqueue);
160 	mp->nack++;
161 	spin_unlock_bh(&mp->ackqlock);
162 	return 0;
163 }
164 
capiminor_del_ack(struct capiminor * mp,u16 datahandle)165 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
166 {
167 	struct ackqueue_entry *p, *tmp;
168 
169 	spin_lock_bh(&mp->ackqlock);
170 	list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
171 		if (p->datahandle == datahandle) {
172 			list_del(&p->list);
173 			mp->nack--;
174 			spin_unlock_bh(&mp->ackqlock);
175 			kfree(p);
176 			return 0;
177 		}
178 	}
179 	spin_unlock_bh(&mp->ackqlock);
180 	return -1;
181 }
182 
capiminor_del_all_ack(struct capiminor * mp)183 static void capiminor_del_all_ack(struct capiminor *mp)
184 {
185 	struct ackqueue_entry *p, *tmp;
186 
187 	list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
188 		list_del(&p->list);
189 		kfree(p);
190 		mp->nack--;
191 	}
192 }
193 
194 
195 /* -------- struct capiminor ---------------------------------------- */
196 
capiminor_destroy(struct tty_port * port)197 static void capiminor_destroy(struct tty_port *port)
198 {
199 	struct capiminor *mp = container_of(port, struct capiminor, port);
200 
201 	kfree_skb(mp->outskb);
202 	skb_queue_purge(&mp->inqueue);
203 	skb_queue_purge(&mp->outqueue);
204 	capiminor_del_all_ack(mp);
205 	kfree(mp);
206 }
207 
208 static const struct tty_port_operations capiminor_port_ops = {
209 	.destruct = capiminor_destroy,
210 };
211 
capiminor_alloc(struct capi20_appl * ap,u32 ncci)212 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
213 {
214 	struct capiminor *mp;
215 	struct device *dev;
216 	unsigned int minor;
217 
218 	mp = kzalloc(sizeof(*mp), GFP_KERNEL);
219 	if (!mp) {
220 		printk(KERN_ERR "capi: can't alloc capiminor\n");
221 		return NULL;
222 	}
223 
224 	mp->ap = ap;
225 	mp->ncci = ncci;
226 	INIT_LIST_HEAD(&mp->ackqueue);
227 	spin_lock_init(&mp->ackqlock);
228 
229 	skb_queue_head_init(&mp->inqueue);
230 	skb_queue_head_init(&mp->outqueue);
231 	spin_lock_init(&mp->outlock);
232 
233 	tty_port_init(&mp->port);
234 	mp->port.ops = &capiminor_port_ops;
235 
236 	/* Allocate the least unused minor number. */
237 	spin_lock(&capiminors_lock);
238 	for (minor = 0; minor < capi_ttyminors; minor++)
239 		if (!capiminors[minor]) {
240 			capiminors[minor] = mp;
241 			break;
242 		}
243 	spin_unlock(&capiminors_lock);
244 
245 	if (minor == capi_ttyminors) {
246 		printk(KERN_NOTICE "capi: out of minors\n");
247 		goto err_out1;
248 	}
249 
250 	mp->minor = minor;
251 
252 	dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
253 			NULL);
254 	if (IS_ERR(dev))
255 		goto err_out2;
256 
257 	return mp;
258 
259 err_out2:
260 	spin_lock(&capiminors_lock);
261 	capiminors[minor] = NULL;
262 	spin_unlock(&capiminors_lock);
263 
264 err_out1:
265 	tty_port_put(&mp->port);
266 	return NULL;
267 }
268 
capiminor_get(unsigned int minor)269 static struct capiminor *capiminor_get(unsigned int minor)
270 {
271 	struct capiminor *mp;
272 
273 	spin_lock(&capiminors_lock);
274 	mp = capiminors[minor];
275 	if (mp)
276 		tty_port_get(&mp->port);
277 	spin_unlock(&capiminors_lock);
278 
279 	return mp;
280 }
281 
capiminor_put(struct capiminor * mp)282 static inline void capiminor_put(struct capiminor *mp)
283 {
284 	tty_port_put(&mp->port);
285 }
286 
capiminor_free(struct capiminor * mp)287 static void capiminor_free(struct capiminor *mp)
288 {
289 	tty_unregister_device(capinc_tty_driver, mp->minor);
290 
291 	spin_lock(&capiminors_lock);
292 	capiminors[mp->minor] = NULL;
293 	spin_unlock(&capiminors_lock);
294 
295 	capiminor_put(mp);
296 }
297 
298 /* -------- struct capincci ----------------------------------------- */
299 
capincci_alloc_minor(struct capidev * cdev,struct capincci * np)300 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
301 {
302 	if (cdev->userflags & CAPIFLAG_HIGHJACKING)
303 		np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
304 }
305 
capincci_free_minor(struct capincci * np)306 static void capincci_free_minor(struct capincci *np)
307 {
308 	struct capiminor *mp = np->minorp;
309 	struct tty_struct *tty;
310 
311 	if (mp) {
312 		tty = tty_port_tty_get(&mp->port);
313 		if (tty) {
314 			tty_vhangup(tty);
315 			tty_kref_put(tty);
316 		}
317 
318 		capiminor_free(mp);
319 	}
320 }
321 
capincci_minor_opencount(struct capincci * np)322 static inline unsigned int capincci_minor_opencount(struct capincci *np)
323 {
324 	struct capiminor *mp = np->minorp;
325 	unsigned int count = 0;
326 	struct tty_struct *tty;
327 
328 	if (mp) {
329 		tty = tty_port_tty_get(&mp->port);
330 		if (tty) {
331 			count = tty->count;
332 			tty_kref_put(tty);
333 		}
334 	}
335 	return count;
336 }
337 
338 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
339 
340 static inline void
capincci_alloc_minor(struct capidev * cdev,struct capincci * np)341 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
capincci_free_minor(struct capincci * np)342 static inline void capincci_free_minor(struct capincci *np) { }
343 
344 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
345 
capincci_alloc(struct capidev * cdev,u32 ncci)346 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
347 {
348 	struct capincci *np;
349 
350 	np = kzalloc(sizeof(*np), GFP_KERNEL);
351 	if (!np)
352 		return NULL;
353 	np->ncci = ncci;
354 	np->cdev = cdev;
355 
356 	capincci_alloc_minor(cdev, np);
357 
358 	list_add_tail(&np->list, &cdev->nccis);
359 
360 	return np;
361 }
362 
capincci_free(struct capidev * cdev,u32 ncci)363 static void capincci_free(struct capidev *cdev, u32 ncci)
364 {
365 	struct capincci *np, *tmp;
366 
367 	list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
368 		if (ncci == 0xffffffff || np->ncci == ncci) {
369 			capincci_free_minor(np);
370 			list_del(&np->list);
371 			kfree(np);
372 		}
373 }
374 
375 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
capincci_find(struct capidev * cdev,u32 ncci)376 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
377 {
378 	struct capincci *np;
379 
380 	list_for_each_entry(np, &cdev->nccis, list)
381 		if (np->ncci == ncci)
382 			return np;
383 	return NULL;
384 }
385 
386 /* -------- handle data queue --------------------------------------- */
387 
388 static struct sk_buff *
gen_data_b3_resp_for(struct capiminor * mp,struct sk_buff * skb)389 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
390 {
391 	struct sk_buff *nskb;
392 	nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
393 	if (nskb) {
394 		u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
395 		unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
396 		capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
397 		capimsg_setu16(s, 2, mp->ap->applid);
398 		capimsg_setu8 (s, 4, CAPI_DATA_B3);
399 		capimsg_setu8 (s, 5, CAPI_RESP);
400 		capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
401 		capimsg_setu32(s, 8, mp->ncci);
402 		capimsg_setu16(s, 12, datahandle);
403 	}
404 	return nskb;
405 }
406 
handle_recv_skb(struct capiminor * mp,struct sk_buff * skb)407 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
408 {
409 	unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
410 	struct tty_struct *tty;
411 	struct sk_buff *nskb;
412 	u16 errcode, datahandle;
413 	struct tty_ldisc *ld;
414 	int ret = -1;
415 
416 	tty = tty_port_tty_get(&mp->port);
417 	if (!tty) {
418 		pr_debug("capi: currently no receiver\n");
419 		return -1;
420 	}
421 
422 	ld = tty_ldisc_ref(tty);
423 	if (!ld) {
424 		/* fatal error, do not requeue */
425 		ret = 0;
426 		kfree_skb(skb);
427 		goto deref_tty;
428 	}
429 
430 	if (ld->ops->receive_buf == NULL) {
431 		pr_debug("capi: ldisc has no receive_buf function\n");
432 		/* fatal error, do not requeue */
433 		goto free_skb;
434 	}
435 	if (mp->ttyinstop) {
436 		pr_debug("capi: recv tty throttled\n");
437 		goto deref_ldisc;
438 	}
439 
440 	if (tty->receive_room < datalen) {
441 		pr_debug("capi: no room in tty\n");
442 		goto deref_ldisc;
443 	}
444 
445 	nskb = gen_data_b3_resp_for(mp, skb);
446 	if (!nskb) {
447 		printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
448 		goto deref_ldisc;
449 	}
450 
451 	datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
452 
453 	errcode = capi20_put_message(mp->ap, nskb);
454 
455 	if (errcode == CAPI_NOERROR) {
456 		skb_pull(skb, CAPIMSG_LEN(skb->data));
457 		pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
458 			 datahandle, skb->len);
459 		ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
460 	} else {
461 		printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
462 		       errcode);
463 		kfree_skb(nskb);
464 
465 		if (errcode == CAPI_SENDQUEUEFULL)
466 			goto deref_ldisc;
467 	}
468 
469 free_skb:
470 	ret = 0;
471 	kfree_skb(skb);
472 
473 deref_ldisc:
474 	tty_ldisc_deref(ld);
475 
476 deref_tty:
477 	tty_kref_put(tty);
478 	return ret;
479 }
480 
handle_minor_recv(struct capiminor * mp)481 static void handle_minor_recv(struct capiminor *mp)
482 {
483 	struct sk_buff *skb;
484 
485 	while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
486 		if (handle_recv_skb(mp, skb) < 0) {
487 			skb_queue_head(&mp->inqueue, skb);
488 			return;
489 		}
490 }
491 
handle_minor_send(struct capiminor * mp)492 static void handle_minor_send(struct capiminor *mp)
493 {
494 	struct tty_struct *tty;
495 	struct sk_buff *skb;
496 	u16 len;
497 	u16 errcode;
498 	u16 datahandle;
499 
500 	tty = tty_port_tty_get(&mp->port);
501 	if (!tty)
502 		return;
503 
504 	if (mp->ttyoutstop) {
505 		pr_debug("capi: send: tty stopped\n");
506 		tty_kref_put(tty);
507 		return;
508 	}
509 
510 	while (1) {
511 		spin_lock_bh(&mp->outlock);
512 		skb = __skb_dequeue(&mp->outqueue);
513 		if (!skb) {
514 			spin_unlock_bh(&mp->outlock);
515 			break;
516 		}
517 		len = (u16)skb->len;
518 		mp->outbytes -= len;
519 		spin_unlock_bh(&mp->outlock);
520 
521 		datahandle = atomic_inc_return(&mp->datahandle);
522 		skb_push(skb, CAPI_DATA_B3_REQ_LEN);
523 		memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
524 		capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
525 		capimsg_setu16(skb->data, 2, mp->ap->applid);
526 		capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
527 		capimsg_setu8 (skb->data, 5, CAPI_REQ);
528 		capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
529 		capimsg_setu32(skb->data, 8, mp->ncci);	/* NCCI */
530 		capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
531 		capimsg_setu16(skb->data, 16, len);	/* Data length */
532 		capimsg_setu16(skb->data, 18, datahandle);
533 		capimsg_setu16(skb->data, 20, 0);	/* Flags */
534 
535 		if (capiminor_add_ack(mp, datahandle) < 0) {
536 			skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
537 
538 			spin_lock_bh(&mp->outlock);
539 			__skb_queue_head(&mp->outqueue, skb);
540 			mp->outbytes += len;
541 			spin_unlock_bh(&mp->outlock);
542 
543 			break;
544 		}
545 		errcode = capi20_put_message(mp->ap, skb);
546 		if (errcode == CAPI_NOERROR) {
547 			pr_debug("capi: DATA_B3_REQ %u len=%u\n",
548 				 datahandle, len);
549 			continue;
550 		}
551 		capiminor_del_ack(mp, datahandle);
552 
553 		if (errcode == CAPI_SENDQUEUEFULL) {
554 			skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
555 
556 			spin_lock_bh(&mp->outlock);
557 			__skb_queue_head(&mp->outqueue, skb);
558 			mp->outbytes += len;
559 			spin_unlock_bh(&mp->outlock);
560 
561 			break;
562 		}
563 
564 		/* ups, drop packet */
565 		printk(KERN_ERR "capi: put_message = %x\n", errcode);
566 		kfree_skb(skb);
567 	}
568 	tty_kref_put(tty);
569 }
570 
571 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
572 /* -------- function called by lower level -------------------------- */
573 
capi_recv_message(struct capi20_appl * ap,struct sk_buff * skb)574 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
575 {
576 	struct capidev *cdev = ap->private;
577 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
578 	struct capiminor *mp;
579 	u16 datahandle;
580 	struct capincci *np;
581 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
582 
583 	mutex_lock(&cdev->lock);
584 
585 	if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
586 		u16 info = CAPIMSG_U16(skb->data, 12); // Info field
587 		if ((info & 0xff00) == 0)
588 			capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
589 	}
590 	if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
591 		capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
592 
593 	if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
594 		skb_queue_tail(&cdev->recvqueue, skb);
595 		wake_up_interruptible(&cdev->recvwait);
596 		goto unlock_out;
597 	}
598 
599 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
600 	skb_queue_tail(&cdev->recvqueue, skb);
601 	wake_up_interruptible(&cdev->recvwait);
602 
603 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
604 
605 	np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
606 	if (!np) {
607 		printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
608 		skb_queue_tail(&cdev->recvqueue, skb);
609 		wake_up_interruptible(&cdev->recvwait);
610 		goto unlock_out;
611 	}
612 
613 	mp = np->minorp;
614 	if (!mp) {
615 		skb_queue_tail(&cdev->recvqueue, skb);
616 		wake_up_interruptible(&cdev->recvwait);
617 		goto unlock_out;
618 	}
619 	if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
620 		datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
621 		pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
622 			 datahandle, skb->len-CAPIMSG_LEN(skb->data));
623 		skb_queue_tail(&mp->inqueue, skb);
624 
625 		handle_minor_recv(mp);
626 
627 	} else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
628 
629 		datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
630 		pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
631 			 datahandle,
632 			 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
633 		kfree_skb(skb);
634 		capiminor_del_ack(mp, datahandle);
635 		tty_port_tty_wakeup(&mp->port);
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
capi_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)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
capi_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)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 	if (count < CAPIMSG_BASELEN)
697 		return -EINVAL;
698 
699 	skb = alloc_skb(count, GFP_USER);
700 	if (!skb)
701 		return -ENOMEM;
702 
703 	if (copy_from_user(skb_put(skb, count), buf, count)) {
704 		kfree_skb(skb);
705 		return -EFAULT;
706 	}
707 	mlen = CAPIMSG_LEN(skb->data);
708 	if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
709 		if (count < CAPI_DATA_B3_REQ_LEN ||
710 		    (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
711 			kfree_skb(skb);
712 			return -EINVAL;
713 		}
714 	} else {
715 		if (mlen != count) {
716 			kfree_skb(skb);
717 			return -EINVAL;
718 		}
719 	}
720 	CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
721 
722 	if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
723 		if (count < CAPI_DISCONNECT_B3_RESP_LEN) {
724 			kfree_skb(skb);
725 			return -EINVAL;
726 		}
727 		mutex_lock(&cdev->lock);
728 		capincci_free(cdev, CAPIMSG_NCCI(skb->data));
729 		mutex_unlock(&cdev->lock);
730 	}
731 
732 	cdev->errcode = capi20_put_message(&cdev->ap, skb);
733 
734 	if (cdev->errcode) {
735 		kfree_skb(skb);
736 		return -EIO;
737 	}
738 	return count;
739 }
740 
741 static __poll_t
capi_poll(struct file * file,poll_table * wait)742 capi_poll(struct file *file, poll_table *wait)
743 {
744 	struct capidev *cdev = file->private_data;
745 	__poll_t mask = 0;
746 
747 	if (!cdev->ap.applid)
748 		return EPOLLERR;
749 
750 	poll_wait(file, &(cdev->recvwait), wait);
751 	mask = EPOLLOUT | EPOLLWRNORM;
752 	if (!skb_queue_empty_lockless(&cdev->recvqueue))
753 		mask |= EPOLLIN | EPOLLRDNORM;
754 	return mask;
755 }
756 
757 static int
capi_ioctl(struct file * file,unsigned int cmd,unsigned long arg)758 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
759 {
760 	struct capidev *cdev = file->private_data;
761 	capi_ioctl_struct data;
762 	int retval = -EINVAL;
763 	void __user *argp = (void __user *)arg;
764 
765 	switch (cmd) {
766 	case CAPI_REGISTER:
767 		mutex_lock(&cdev->lock);
768 
769 		if (cdev->ap.applid) {
770 			retval = -EEXIST;
771 			goto register_out;
772 		}
773 		if (copy_from_user(&cdev->ap.rparam, argp,
774 				   sizeof(struct capi_register_params))) {
775 			retval = -EFAULT;
776 			goto register_out;
777 		}
778 		cdev->ap.private = cdev;
779 		cdev->ap.recv_message = capi_recv_message;
780 		cdev->errcode = capi20_register(&cdev->ap);
781 		retval = (int)cdev->ap.applid;
782 		if (cdev->errcode) {
783 			cdev->ap.applid = 0;
784 			retval = -EIO;
785 		}
786 
787 register_out:
788 		mutex_unlock(&cdev->lock);
789 		return retval;
790 
791 	case CAPI_GET_VERSION:
792 		if (copy_from_user(&data.contr, argp,
793 				   sizeof(data.contr)))
794 			return -EFAULT;
795 		cdev->errcode = capi20_get_version(data.contr, &data.version);
796 		if (cdev->errcode)
797 			return -EIO;
798 		if (copy_to_user(argp, &data.version,
799 				 sizeof(data.version)))
800 			return -EFAULT;
801 		return 0;
802 
803 	case CAPI_GET_SERIAL:
804 		if (copy_from_user(&data.contr, argp,
805 				   sizeof(data.contr)))
806 			return -EFAULT;
807 		cdev->errcode = capi20_get_serial(data.contr, data.serial);
808 		if (cdev->errcode)
809 			return -EIO;
810 		if (copy_to_user(argp, data.serial,
811 				 sizeof(data.serial)))
812 			return -EFAULT;
813 		return 0;
814 
815 	case CAPI_GET_PROFILE:
816 		if (copy_from_user(&data.contr, argp,
817 				   sizeof(data.contr)))
818 			return -EFAULT;
819 
820 		if (data.contr == 0) {
821 			cdev->errcode = capi20_get_profile(data.contr, &data.profile);
822 			if (cdev->errcode)
823 				return -EIO;
824 
825 			retval = copy_to_user(argp,
826 					      &data.profile.ncontroller,
827 					      sizeof(data.profile.ncontroller));
828 
829 		} else {
830 			cdev->errcode = capi20_get_profile(data.contr, &data.profile);
831 			if (cdev->errcode)
832 				return -EIO;
833 
834 			retval = copy_to_user(argp, &data.profile,
835 					      sizeof(data.profile));
836 		}
837 		if (retval)
838 			return -EFAULT;
839 		return 0;
840 
841 	case CAPI_GET_MANUFACTURER:
842 		if (copy_from_user(&data.contr, argp,
843 				   sizeof(data.contr)))
844 			return -EFAULT;
845 		cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
846 		if (cdev->errcode)
847 			return -EIO;
848 
849 		if (copy_to_user(argp, data.manufacturer,
850 				 sizeof(data.manufacturer)))
851 			return -EFAULT;
852 
853 		return 0;
854 
855 	case CAPI_GET_ERRCODE:
856 		data.errcode = cdev->errcode;
857 		cdev->errcode = CAPI_NOERROR;
858 		if (arg) {
859 			if (copy_to_user(argp, &data.errcode,
860 					 sizeof(data.errcode)))
861 				return -EFAULT;
862 		}
863 		return data.errcode;
864 
865 	case CAPI_INSTALLED:
866 		if (capi20_isinstalled() == CAPI_NOERROR)
867 			return 0;
868 		return -ENXIO;
869 
870 	case CAPI_MANUFACTURER_CMD: {
871 		struct capi_manufacturer_cmd mcmd;
872 		if (!capable(CAP_SYS_ADMIN))
873 			return -EPERM;
874 		if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
875 			return -EFAULT;
876 		return capi20_manufacturer(mcmd.cmd, mcmd.data);
877 	}
878 	case CAPI_SET_FLAGS:
879 	case CAPI_CLR_FLAGS: {
880 		unsigned userflags;
881 
882 		if (copy_from_user(&userflags, argp, sizeof(userflags)))
883 			return -EFAULT;
884 
885 		mutex_lock(&cdev->lock);
886 		if (cmd == CAPI_SET_FLAGS)
887 			cdev->userflags |= userflags;
888 		else
889 			cdev->userflags &= ~userflags;
890 		mutex_unlock(&cdev->lock);
891 		return 0;
892 	}
893 	case CAPI_GET_FLAGS:
894 		if (copy_to_user(argp, &cdev->userflags,
895 				 sizeof(cdev->userflags)))
896 			return -EFAULT;
897 		return 0;
898 
899 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
900 	case CAPI_NCCI_OPENCOUNT:
901 		return 0;
902 
903 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
904 	case CAPI_NCCI_OPENCOUNT: {
905 		struct capincci *nccip;
906 		unsigned ncci;
907 		int count = 0;
908 
909 		if (copy_from_user(&ncci, argp, sizeof(ncci)))
910 			return -EFAULT;
911 
912 		mutex_lock(&cdev->lock);
913 		nccip = capincci_find(cdev, (u32)ncci);
914 		if (nccip)
915 			count = capincci_minor_opencount(nccip);
916 		mutex_unlock(&cdev->lock);
917 		return count;
918 	}
919 
920 	case CAPI_NCCI_GETUNIT: {
921 		struct capincci *nccip;
922 		struct capiminor *mp;
923 		unsigned ncci;
924 		int unit = -ESRCH;
925 
926 		if (copy_from_user(&ncci, argp, sizeof(ncci)))
927 			return -EFAULT;
928 
929 		mutex_lock(&cdev->lock);
930 		nccip = capincci_find(cdev, (u32)ncci);
931 		if (nccip) {
932 			mp = nccip->minorp;
933 			if (mp)
934 				unit = mp->minor;
935 		}
936 		mutex_unlock(&cdev->lock);
937 		return unit;
938 	}
939 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
940 
941 	default:
942 		return -EINVAL;
943 	}
944 }
945 
946 static long
capi_unlocked_ioctl(struct file * file,unsigned int cmd,unsigned long arg)947 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
948 {
949 	int ret;
950 
951 	mutex_lock(&capi_mutex);
952 	ret = capi_ioctl(file, cmd, arg);
953 	mutex_unlock(&capi_mutex);
954 
955 	return ret;
956 }
957 
958 #ifdef CONFIG_COMPAT
959 static long
capi_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)960 capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
961 {
962 	int ret;
963 
964 	if (cmd == CAPI_MANUFACTURER_CMD) {
965 		struct {
966 			compat_ulong_t cmd;
967 			compat_uptr_t data;
968 		} mcmd32;
969 
970 		if (!capable(CAP_SYS_ADMIN))
971 			return -EPERM;
972 		if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
973 			return -EFAULT;
974 
975 		mutex_lock(&capi_mutex);
976 		ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
977 		mutex_unlock(&capi_mutex);
978 
979 		return ret;
980 	}
981 
982 	return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
983 }
984 #endif
985 
capi_open(struct inode * inode,struct file * file)986 static int capi_open(struct inode *inode, struct file *file)
987 {
988 	struct capidev *cdev;
989 
990 	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
991 	if (!cdev)
992 		return -ENOMEM;
993 
994 	mutex_init(&cdev->lock);
995 	skb_queue_head_init(&cdev->recvqueue);
996 	init_waitqueue_head(&cdev->recvwait);
997 	INIT_LIST_HEAD(&cdev->nccis);
998 	file->private_data = cdev;
999 
1000 	mutex_lock(&capidev_list_lock);
1001 	list_add_tail(&cdev->list, &capidev_list);
1002 	mutex_unlock(&capidev_list_lock);
1003 
1004 	return stream_open(inode, file);
1005 }
1006 
capi_release(struct inode * inode,struct file * file)1007 static int capi_release(struct inode *inode, struct file *file)
1008 {
1009 	struct capidev *cdev = file->private_data;
1010 
1011 	mutex_lock(&capidev_list_lock);
1012 	list_del(&cdev->list);
1013 	mutex_unlock(&capidev_list_lock);
1014 
1015 	if (cdev->ap.applid)
1016 		capi20_release(&cdev->ap);
1017 	skb_queue_purge(&cdev->recvqueue);
1018 	capincci_free(cdev, 0xffffffff);
1019 
1020 	kfree(cdev);
1021 	return 0;
1022 }
1023 
1024 static const struct file_operations capi_fops =
1025 {
1026 	.owner		= THIS_MODULE,
1027 	.read		= capi_read,
1028 	.write		= capi_write,
1029 	.poll		= capi_poll,
1030 	.unlocked_ioctl	= capi_unlocked_ioctl,
1031 #ifdef CONFIG_COMPAT
1032 	.compat_ioctl	= capi_compat_ioctl,
1033 #endif
1034 	.open		= capi_open,
1035 	.release	= capi_release,
1036 };
1037 
1038 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1039 /* -------- tty_operations for capincci ----------------------------- */
1040 
1041 static int
capinc_tty_install(struct tty_driver * driver,struct tty_struct * tty)1042 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1043 {
1044 	struct capiminor *mp = capiminor_get(tty->index);
1045 	int ret = tty_standard_install(driver, tty);
1046 
1047 	if (ret == 0)
1048 		tty->driver_data = mp;
1049 	else
1050 		capiminor_put(mp);
1051 	return ret;
1052 }
1053 
capinc_tty_cleanup(struct tty_struct * tty)1054 static void capinc_tty_cleanup(struct tty_struct *tty)
1055 {
1056 	struct capiminor *mp = tty->driver_data;
1057 	tty->driver_data = NULL;
1058 	capiminor_put(mp);
1059 }
1060 
capinc_tty_open(struct tty_struct * tty,struct file * filp)1061 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1062 {
1063 	struct capiminor *mp = tty->driver_data;
1064 	int err;
1065 
1066 	err = tty_port_open(&mp->port, tty, filp);
1067 	if (err)
1068 		return err;
1069 
1070 	handle_minor_recv(mp);
1071 	return 0;
1072 }
1073 
capinc_tty_close(struct tty_struct * tty,struct file * filp)1074 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1075 {
1076 	struct capiminor *mp = tty->driver_data;
1077 
1078 	tty_port_close(&mp->port, tty, filp);
1079 }
1080 
capinc_tty_write(struct tty_struct * tty,const u8 * buf,size_t count)1081 static ssize_t capinc_tty_write(struct tty_struct *tty, const u8 *buf,
1082 				size_t count)
1083 {
1084 	struct capiminor *mp = tty->driver_data;
1085 	struct sk_buff *skb;
1086 
1087 	pr_debug("capinc_tty_write(count=%zu)\n", count);
1088 
1089 	spin_lock_bh(&mp->outlock);
1090 	skb = mp->outskb;
1091 	if (skb) {
1092 		mp->outskb = NULL;
1093 		__skb_queue_tail(&mp->outqueue, skb);
1094 		mp->outbytes += skb->len;
1095 	}
1096 
1097 	skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1098 	if (!skb) {
1099 		printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1100 		spin_unlock_bh(&mp->outlock);
1101 		return -ENOMEM;
1102 	}
1103 
1104 	skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1105 	skb_put_data(skb, buf, count);
1106 
1107 	__skb_queue_tail(&mp->outqueue, skb);
1108 	mp->outbytes += skb->len;
1109 	spin_unlock_bh(&mp->outlock);
1110 
1111 	handle_minor_send(mp);
1112 
1113 	return count;
1114 }
1115 
capinc_tty_put_char(struct tty_struct * tty,u8 ch)1116 static int capinc_tty_put_char(struct tty_struct *tty, u8 ch)
1117 {
1118 	struct capiminor *mp = tty->driver_data;
1119 	bool invoke_send = false;
1120 	struct sk_buff *skb;
1121 	int ret = 1;
1122 
1123 	pr_debug("capinc_put_char(%u)\n", ch);
1124 
1125 	spin_lock_bh(&mp->outlock);
1126 	skb = mp->outskb;
1127 	if (skb) {
1128 		if (skb_tailroom(skb) > 0) {
1129 			skb_put_u8(skb, ch);
1130 			goto unlock_out;
1131 		}
1132 		mp->outskb = NULL;
1133 		__skb_queue_tail(&mp->outqueue, skb);
1134 		mp->outbytes += skb->len;
1135 		invoke_send = true;
1136 	}
1137 
1138 	skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1139 	if (skb) {
1140 		skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1141 		skb_put_u8(skb, ch);
1142 		mp->outskb = skb;
1143 	} else {
1144 		printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1145 		ret = 0;
1146 	}
1147 
1148 unlock_out:
1149 	spin_unlock_bh(&mp->outlock);
1150 
1151 	if (invoke_send)
1152 		handle_minor_send(mp);
1153 
1154 	return ret;
1155 }
1156 
capinc_tty_flush_chars(struct tty_struct * tty)1157 static void capinc_tty_flush_chars(struct tty_struct *tty)
1158 {
1159 	struct capiminor *mp = tty->driver_data;
1160 	struct sk_buff *skb;
1161 
1162 	spin_lock_bh(&mp->outlock);
1163 	skb = mp->outskb;
1164 	if (skb) {
1165 		mp->outskb = NULL;
1166 		__skb_queue_tail(&mp->outqueue, skb);
1167 		mp->outbytes += skb->len;
1168 		spin_unlock_bh(&mp->outlock);
1169 
1170 		handle_minor_send(mp);
1171 	} else
1172 		spin_unlock_bh(&mp->outlock);
1173 
1174 	handle_minor_recv(mp);
1175 }
1176 
capinc_tty_write_room(struct tty_struct * tty)1177 static unsigned int capinc_tty_write_room(struct tty_struct *tty)
1178 {
1179 	struct capiminor *mp = tty->driver_data;
1180 	unsigned int room;
1181 
1182 	room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1183 	room *= CAPI_MAX_BLKSIZE;
1184 	pr_debug("capinc_tty_write_room = %u\n", room);
1185 	return room;
1186 }
1187 
capinc_tty_chars_in_buffer(struct tty_struct * tty)1188 static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1189 {
1190 	struct capiminor *mp = tty->driver_data;
1191 
1192 	pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1193 		 mp->outbytes, mp->nack,
1194 		 skb_queue_len(&mp->outqueue),
1195 		 skb_queue_len(&mp->inqueue));
1196 	return mp->outbytes;
1197 }
1198 
capinc_tty_throttle(struct tty_struct * tty)1199 static void capinc_tty_throttle(struct tty_struct *tty)
1200 {
1201 	struct capiminor *mp = tty->driver_data;
1202 	mp->ttyinstop = 1;
1203 }
1204 
capinc_tty_unthrottle(struct tty_struct * tty)1205 static void capinc_tty_unthrottle(struct tty_struct *tty)
1206 {
1207 	struct capiminor *mp = tty->driver_data;
1208 
1209 	mp->ttyinstop = 0;
1210 	handle_minor_recv(mp);
1211 }
1212 
capinc_tty_stop(struct tty_struct * tty)1213 static void capinc_tty_stop(struct tty_struct *tty)
1214 {
1215 	struct capiminor *mp = tty->driver_data;
1216 
1217 	mp->ttyoutstop = 1;
1218 }
1219 
capinc_tty_start(struct tty_struct * tty)1220 static void capinc_tty_start(struct tty_struct *tty)
1221 {
1222 	struct capiminor *mp = tty->driver_data;
1223 
1224 	mp->ttyoutstop = 0;
1225 	handle_minor_send(mp);
1226 }
1227 
capinc_tty_hangup(struct tty_struct * tty)1228 static void capinc_tty_hangup(struct tty_struct *tty)
1229 {
1230 	struct capiminor *mp = tty->driver_data;
1231 
1232 	tty_port_hangup(&mp->port);
1233 }
1234 
capinc_tty_send_xchar(struct tty_struct * tty,u8 ch)1235 static void capinc_tty_send_xchar(struct tty_struct *tty, u8 ch)
1236 {
1237 	pr_debug("capinc_tty_send_xchar(%u)\n", ch);
1238 }
1239 
1240 static const struct tty_operations capinc_ops = {
1241 	.open = capinc_tty_open,
1242 	.close = capinc_tty_close,
1243 	.write = capinc_tty_write,
1244 	.put_char = capinc_tty_put_char,
1245 	.flush_chars = capinc_tty_flush_chars,
1246 	.write_room = capinc_tty_write_room,
1247 	.chars_in_buffer = capinc_tty_chars_in_buffer,
1248 	.throttle = capinc_tty_throttle,
1249 	.unthrottle = capinc_tty_unthrottle,
1250 	.stop = capinc_tty_stop,
1251 	.start = capinc_tty_start,
1252 	.hangup = capinc_tty_hangup,
1253 	.send_xchar = capinc_tty_send_xchar,
1254 	.install = capinc_tty_install,
1255 	.cleanup = capinc_tty_cleanup,
1256 };
1257 
capinc_tty_init(void)1258 static int __init capinc_tty_init(void)
1259 {
1260 	struct tty_driver *drv;
1261 	int err;
1262 
1263 	if (capi_ttyminors > CAPINC_MAX_PORTS)
1264 		capi_ttyminors = CAPINC_MAX_PORTS;
1265 	if (capi_ttyminors <= 0)
1266 		capi_ttyminors = CAPINC_NR_PORTS;
1267 
1268 	capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1269 			     GFP_KERNEL);
1270 	if (!capiminors)
1271 		return -ENOMEM;
1272 
1273 	drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW |
1274 			TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV);
1275 	if (IS_ERR(drv)) {
1276 		kfree(capiminors);
1277 		return PTR_ERR(drv);
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 	tty_set_operations(drv, &capinc_ops);
1291 
1292 	err = tty_register_driver(drv);
1293 	if (err) {
1294 		tty_driver_kref_put(drv);
1295 		kfree(capiminors);
1296 		printk(KERN_ERR "Couldn't register capi_nc driver\n");
1297 		return err;
1298 	}
1299 	capinc_tty_driver = drv;
1300 	return 0;
1301 }
1302 
capinc_tty_exit(void)1303 static void __exit capinc_tty_exit(void)
1304 {
1305 	tty_unregister_driver(capinc_tty_driver);
1306 	tty_driver_kref_put(capinc_tty_driver);
1307 	kfree(capiminors);
1308 }
1309 
1310 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1311 
capinc_tty_init(void)1312 static inline int capinc_tty_init(void)
1313 {
1314 	return 0;
1315 }
1316 
capinc_tty_exit(void)1317 static inline void capinc_tty_exit(void) { }
1318 
1319 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1320 
1321 /* -------- /proc functions ----------------------------------------- */
1322 
1323 /*
1324  * /proc/capi/capi20:
1325  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1326  */
capi20_proc_show(struct seq_file * m,void * v)1327 static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1328 {
1329 	struct capidev *cdev;
1330 	struct list_head *l;
1331 
1332 	mutex_lock(&capidev_list_lock);
1333 	list_for_each(l, &capidev_list) {
1334 		cdev = list_entry(l, struct capidev, list);
1335 		seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1336 			   cdev->ap.applid,
1337 			   cdev->ap.nrecvctlpkt,
1338 			   cdev->ap.nrecvdatapkt,
1339 			   cdev->ap.nsentctlpkt,
1340 			   cdev->ap.nsentdatapkt);
1341 	}
1342 	mutex_unlock(&capidev_list_lock);
1343 	return 0;
1344 }
1345 
1346 /*
1347  * /proc/capi/capi20ncci:
1348  *  applid ncci
1349  */
capi20ncci_proc_show(struct seq_file * m,void * v)1350 static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1351 {
1352 	struct capidev *cdev;
1353 	struct capincci *np;
1354 
1355 	mutex_lock(&capidev_list_lock);
1356 	list_for_each_entry(cdev, &capidev_list, list) {
1357 		mutex_lock(&cdev->lock);
1358 		list_for_each_entry(np, &cdev->nccis, list)
1359 			seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1360 		mutex_unlock(&cdev->lock);
1361 	}
1362 	mutex_unlock(&capidev_list_lock);
1363 	return 0;
1364 }
1365 
proc_init(void)1366 static void __init proc_init(void)
1367 {
1368 	proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1369 	proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1370 }
1371 
proc_exit(void)1372 static void __exit proc_exit(void)
1373 {
1374 	remove_proc_entry("capi/capi20", NULL);
1375 	remove_proc_entry("capi/capi20ncci", NULL);
1376 }
1377 
1378 /* -------- init function and module interface ---------------------- */
1379 
1380 
capi_init(void)1381 static int __init capi_init(void)
1382 {
1383 	const char *compileinfo;
1384 	int major_ret;
1385 	int ret;
1386 
1387 	ret = kcapi_init();
1388 	if (ret)
1389 		return ret;
1390 
1391 	major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1392 	if (major_ret < 0) {
1393 		printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1394 		kcapi_exit();
1395 		return major_ret;
1396 	}
1397 
1398 	ret = class_register(&capi_class);
1399 	if (ret) {
1400 		unregister_chrdev(capi_major, "capi20");
1401 		kcapi_exit();
1402 		return ret;
1403 	}
1404 
1405 	device_create(&capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1406 
1407 	if (capinc_tty_init() < 0) {
1408 		device_destroy(&capi_class, MKDEV(capi_major, 0));
1409 		class_unregister(&capi_class);
1410 		unregister_chrdev(capi_major, "capi20");
1411 		kcapi_exit();
1412 		return -ENOMEM;
1413 	}
1414 
1415 	proc_init();
1416 
1417 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1418 	compileinfo = " (middleware)";
1419 #else
1420 	compileinfo = " (no middleware)";
1421 #endif
1422 	printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1423 	       capi_major, compileinfo);
1424 
1425 	return 0;
1426 }
1427 
capi_exit(void)1428 static void __exit capi_exit(void)
1429 {
1430 	proc_exit();
1431 
1432 	device_destroy(&capi_class, MKDEV(capi_major, 0));
1433 	class_unregister(&capi_class);
1434 	unregister_chrdev(capi_major, "capi20");
1435 
1436 	capinc_tty_exit();
1437 
1438 	kcapi_exit();
1439 }
1440 
1441 module_init(capi_init);
1442 module_exit(capi_exit);
1443