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   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/smp_lock.h>
  24 #include <linux/timer.h>
  25 #include <linux/wait.h>
  26 #include <linux/tty.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/ppp_defs.h>
  29 #include <linux/if_ppp.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/poll.h>
  34 #include <linux/capi.h>
  35 #include <linux/kernelcapi.h>
  36 #include <linux/init.h>
  37 #include <linux/device.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/isdn/capiutil.h>
  40 #include <linux/isdn/capicmd.h>
  41
  42 #include "capifs.h"
  43
  44 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  45 MODULE_AUTHOR("Carsten Paeth");
  46 MODULE_LICENSE("GPL");
  47
  48 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  49 #undef _DEBUG_DATAFLOW          /* data flow */
  50
  51 /* -------- driver information -------------------------------------- */
  52
  53 static struct class *capi_class;
  54 static int capi_major = 68;             /* allocated */
  55
  56 module_param_named(major, capi_major, uint, 0);
  57
  58 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  59 #define CAPINC_NR_PORTS         32
  60 #define CAPINC_MAX_PORTS        256
  61
  62 static int capi_ttyminors = CAPINC_NR_PORTS;
  63
  64 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  65 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  66
  67 /* -------- defines ------------------------------------------------- */
  68
  69 #define CAPINC_MAX_RECVQUEUE    10
  70 #define CAPINC_MAX_SENDQUEUE    10
  71 #define CAPI_MAX_BLKSIZE        2048
  72
  73 /* -------- data structures ----------------------------------------- */
  74
  75 struct capidev;
  76 struct capincci;
  77 struct capiminor;
  78
  79 struct datahandle_queue {
  80         struct list_head        list;
  81         u16                     datahandle;
  82 };
  83
  84 struct capiminor {
  85         struct kref kref;
  86
  87         unsigned int      minor;
  88         struct dentry *capifs_dentry;
  89
  90         struct capi20_appl *ap;
  91         u32              ncci;
  92         u16              datahandle;
  93         u16              msgid;
  94
  95         struct tty_port port;
  96         int                ttyinstop;
  97         int                ttyoutstop;
  98         struct sk_buff    *ttyskb;
  99
 100         struct sk_buff_head inqueue;
 101         int                 inbytes;
 102         struct sk_buff_head outqueue;
 103         int                 outbytes;
 104
 105         /* transmit path */
 106         struct list_head ackqueue;
 107         int nack;
 108         spinlock_t ackqlock;
 109 };
 110
 111 /* FIXME: The following lock is a sledgehammer-workaround to a
 112  * locking issue with the capiminor (and maybe other) data structure(s).
 113  * Access to this data is done in a racy way and crashes the machine with
 114  * a FritzCard DSL driver; sooner or later. This is a workaround
 115  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 116  * The correct (and scalable) fix for the issue seems to require
 117  * an API change to the drivers... . */
 118 static DEFINE_SPINLOCK(workaround_lock);
 119
 120 struct capincci {
 121         struct list_head list;
 122         u32              ncci;
 123         struct capidev  *cdev;
 124 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 125         struct capiminor *minorp;
 126 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 127 };
 128
 129 struct capidev {
 130         struct list_head list;
 131         struct capi20_appl ap;
 132         u16             errcode;
 133         unsigned        userflags;
 134
 135         struct sk_buff_head recvqueue;
 136         wait_queue_head_t recvwait;
 137
 138         struct list_head nccis;
 139
 140         struct mutex lock;
 141 };
 142
 143 /* -------- global variables ---------------------------------------- */
 144
 145 static DEFINE_MUTEX(capidev_list_lock);
 146 static LIST_HEAD(capidev_list);
 147
 148 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 149
 150 static DEFINE_SPINLOCK(capiminors_lock);
 151 static struct capiminor **capiminors;
 152
 153 static struct tty_driver *capinc_tty_driver;
 154
 155 /* -------- datahandles --------------------------------------------- */
 156
 157 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 158 {
 159         struct datahandle_queue *n;
 160         unsigned long flags;
 161
 162         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 163         if (unlikely(!n)) {
 164                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 165                 return -1;
 166         }
 167         n->datahandle = datahandle;
 168         INIT_LIST_HEAD(&n->list);
 169         spin_lock_irqsave(&mp->ackqlock, flags);
 170         list_add_tail(&n->list, &mp->ackqueue);
 171         mp->nack++;
 172         spin_unlock_irqrestore(&mp->ackqlock, flags);
 173         return 0;
 174 }
 175
 176 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 177 {
 178         struct datahandle_queue *p, *tmp;
 179         unsigned long flags;
 180
 181         spin_lock_irqsave(&mp->ackqlock, flags);
 182         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 183                 if (p->datahandle == datahandle) {
 184                         list_del(&p->list);
 185                         kfree(p);
 186                         mp->nack--;
 187                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 188                         return 0;
 189                 }
 190         }
 191         spin_unlock_irqrestore(&mp->ackqlock, flags);
 192         return -1;
 193 }
 194
 195 static void capiminor_del_all_ack(struct capiminor *mp)
 196 {
 197         struct datahandle_queue *p, *tmp;
 198         unsigned long flags;
 199
 200         spin_lock_irqsave(&mp->ackqlock, flags);
 201         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 202                 list_del(&p->list);
 203                 kfree(p);
 204                 mp->nack--;
 205         }
 206         spin_unlock_irqrestore(&mp->ackqlock, flags);
 207 }
 208
 209
 210 /* -------- struct capiminor ---------------------------------------- */
 211
 212 static const struct tty_port_operations capiminor_port_ops; /* we have none */
 213
 214 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 215 {
 216         struct capiminor *mp;
 217         struct device *dev;
 218         unsigned int minor;
 219
 220         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 221         if (!mp) {
 222                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 223                 return NULL;
 224         }
 225
 226         kref_init(&mp->kref);
 227
 228         mp->ap = ap;
 229         mp->ncci = ncci;
 230         mp->msgid = 0;
 231         INIT_LIST_HEAD(&mp->ackqueue);
 232         spin_lock_init(&mp->ackqlock);
 233
 234         skb_queue_head_init(&mp->inqueue);
 235         skb_queue_head_init(&mp->outqueue);
 236
 237         tty_port_init(&mp->port);
 238         mp->port.ops = &capiminor_port_ops;
 239
 240         /* Allocate the least unused minor number. */
 241         spin_lock(&capiminors_lock);
 242         for (minor = 0; minor < capi_ttyminors; minor++)
 243                 if (!capiminors[minor]) {
 244                         capiminors[minor] = mp;
 245                         break;
 246                 }
 247         spin_unlock(&capiminors_lock);
 248
 249         if (minor == capi_ttyminors) {
 250                 printk(KERN_NOTICE "capi: out of minors\n");
 251                 goto err_out1;
 252         }
 253
 254         mp->minor = minor;
 255
 256         dev = tty_register_device(capinc_tty_driver, minor, NULL);
 257         if (IS_ERR(dev))
 258                 goto err_out2;
 259
 260         return mp;
 261
 262 err_out2:
 263         spin_lock(&capiminors_lock);
 264         capiminors[minor] = NULL;
 265         spin_unlock(&capiminors_lock);
 266
 267 err_out1:
 268         kfree(mp);
 269         return NULL;
 270 }
 271
 272 static void capiminor_destroy(struct kref *kref)
 273 {
 274         struct capiminor *mp = container_of(kref, struct capiminor, kref);
 275
 276         kfree_skb(mp->ttyskb);
 277         skb_queue_purge(&mp->inqueue);
 278         skb_queue_purge(&mp->outqueue);
 279         capiminor_del_all_ack(mp);
 280         kfree(mp);
 281 }
 282
 283 static struct capiminor *capiminor_get(unsigned int minor)
 284 {
 285         struct capiminor *mp;
 286
 287         spin_lock(&capiminors_lock);
 288         mp = capiminors[minor];
 289         if (mp)
 290                 kref_get(&mp->kref);
 291         spin_unlock(&capiminors_lock);
 292
 293         return mp;
 294 }
 295
 296 static inline void capiminor_put(struct capiminor *mp)
 297 {
 298         kref_put(&mp->kref, capiminor_destroy);
 299 }
 300
 301 static void capiminor_free(struct capiminor *mp)
 302 {
 303         tty_unregister_device(capinc_tty_driver, mp->minor);
 304
 305         spin_lock(&capiminors_lock);
 306         capiminors[mp->minor] = NULL;
 307         spin_unlock(&capiminors_lock);
 308
 309         capiminor_put(mp);
 310 }
 311
 312 /* -------- struct capincci ----------------------------------------- */
 313
 314 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 315 {
 316         struct capiminor *mp;
 317         dev_t device;
 318
 319         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 320                 return;
 321
 322         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 323         if (mp) {
 324                 device = MKDEV(capinc_tty_driver->major, mp->minor);
 325                 mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
 326         }
 327 }
 328
 329 static void capincci_free_minor(struct capincci *np)
 330 {
 331         struct capiminor *mp = np->minorp;
 332         struct tty_struct *tty;
 333
 334         if (mp) {
 335                 capifs_free_ncci(mp->capifs_dentry);
 336
 337                 tty = tty_port_tty_get(&mp->port);
 338                 if (tty) {
 339                         tty_vhangup(tty);
 340                         tty_kref_put(tty);
 341                 }
 342
 343                 capiminor_free(mp);
 344         }
 345 }
 346
 347 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 348 {
 349         struct capiminor *mp = np->minorp;
 350         unsigned int count = 0;
 351         struct tty_struct *tty;
 352
 353         if (mp) {
 354                 tty = tty_port_tty_get(&mp->port);
 355                 if (tty) {
 356                         count = tty->count;
 357                         tty_kref_put(tty);
 358                 }
 359         }
 360         return count;
 361 }
 362
 363 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 364
 365 static inline void
 366 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 367 static inline void capincci_free_minor(struct capincci *np) { }
 368
 369 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 370 {
 371         return 0;
 372 }
 373
 374 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 375
 376 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 377 {
 378         struct capincci *np;
 379
 380         np = kzalloc(sizeof(*np), GFP_KERNEL);
 381         if (!np)
 382                 return NULL;
 383         np->ncci = ncci;
 384         np->cdev = cdev;
 385
 386         capincci_alloc_minor(cdev, np);
 387
 388         list_add_tail(&np->list, &cdev->nccis);
 389
 390         return np;
 391 }
 392
 393 static void capincci_free(struct capidev *cdev, u32 ncci)
 394 {
 395         struct capincci *np, *tmp;
 396
 397         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 398                 if (ncci == 0xffffffff || np->ncci == ncci) {
 399                         capincci_free_minor(np);
 400                         list_del(&np->list);
 401                         kfree(np);
 402                 }
 403 }
 404
 405 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 406 {
 407         struct capincci *np;
 408
 409         list_for_each_entry(np, &cdev->nccis, list)
 410                 if (np->ncci == ncci)
 411                         return np;
 412         return NULL;
 413 }
 414
 415 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 416 /* -------- handle data queue --------------------------------------- */
 417
 418 static struct sk_buff *
 419 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 420 {
 421         struct sk_buff *nskb;
 422         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 423         if (nskb) {
 424                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 425                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 426                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 427                 capimsg_setu16(s, 2, mp->ap->applid);
 428                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 429                 capimsg_setu8 (s, 5, CAPI_RESP);
 430                 capimsg_setu16(s, 6, mp->msgid++);
 431                 capimsg_setu32(s, 8, mp->ncci);
 432                 capimsg_setu16(s, 12, datahandle);
 433         }
 434         return nskb;
 435 }
 436
 437 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 438 {
 439         struct tty_struct *tty;
 440         struct sk_buff *nskb;
 441         int datalen;
 442         u16 errcode, datahandle;
 443         struct tty_ldisc *ld;
 444         int ret = -1;
 445
 446         datalen = skb->len - CAPIMSG_LEN(skb->data);
 447
 448         tty = tty_port_tty_get(&mp->port);
 449         if (!tty) {
 450 #ifdef _DEBUG_DATAFLOW
 451                 printk(KERN_DEBUG "capi: currently no receiver\n");
 452 #endif
 453                 return -1;
 454         }
 455
 456         ld = tty_ldisc_ref(tty);
 457         if (!ld)
 458                 goto out1;
 459
 460         if (ld->ops->receive_buf == NULL) {
 461 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 462                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 463 #endif
 464                 goto out2;
 465         }
 466         if (mp->ttyinstop) {
 467 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 468                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 469 #endif
 470                 goto out2;
 471         }
 472         if (tty->receive_room < datalen) {
 473 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 474                 printk(KERN_DEBUG "capi: no room in tty\n");
 475 #endif
 476                 goto out2;
 477         }
 478         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 479                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 480                 goto out2;
 481         }
 482         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 483         errcode = capi20_put_message(mp->ap, nskb);
 484         if (errcode != CAPI_NOERROR) {
 485                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 486                                 errcode);
 487                 kfree_skb(nskb);
 488                 goto out2;
 489         }
 490         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 491 #ifdef _DEBUG_DATAFLOW
 492         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 493                                 datahandle, skb->len);
 494 #endif
 495         ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 496         kfree_skb(skb);
 497         ret = 0;
 498 out2:
 499         tty_ldisc_deref(ld);
 500 out1:
 501         tty_kref_put(tty);
 502         return ret;
 503 }
 504
 505 static void handle_minor_recv(struct capiminor *mp)
 506 {
 507         struct sk_buff *skb;
 508         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 509                 unsigned int len = skb->len;
 510                 mp->inbytes -= len;
 511                 if (handle_recv_skb(mp, skb) < 0) {
 512                         skb_queue_head(&mp->inqueue, skb);
 513                         mp->inbytes += len;
 514                         return;
 515                 }
 516         }
 517 }
 518
 519 static int handle_minor_send(struct capiminor *mp)
 520 {
 521         struct tty_struct *tty;
 522         struct sk_buff *skb;
 523         u16 len;
 524         int count = 0;
 525         u16 errcode;
 526         u16 datahandle;
 527
 528         tty = tty_port_tty_get(&mp->port);
 529         if (!tty)
 530                 return 0;
 531
 532         if (mp->ttyoutstop) {
 533 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 534                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 535 #endif
 536                 tty_kref_put(tty);
 537                 return 0;
 538         }
 539
 540         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 541                 datahandle = mp->datahandle;
 542                 len = (u16)skb->len;
 543                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 544                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 545                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 546                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 547                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 548                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 549                 capimsg_setu16(skb->data, 6, mp->msgid++);
 550                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 551                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 552                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 553                 capimsg_setu16(skb->data, 18, datahandle);
 554                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 555
 556                 if (capiminor_add_ack(mp, datahandle) < 0) {
 557                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 558                         skb_queue_head(&mp->outqueue, skb);
 559                         tty_kref_put(tty);
 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         tty_kref_put(tty);
 587         return count;
 588 }
 589
 590 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 591 /* -------- function called by lower level -------------------------- */
 592
 593 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 594 {
 595         struct capidev *cdev = ap->private;
 596 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 597         struct tty_struct *tty;
 598         struct capiminor *mp;
 599         u16 datahandle;
 600 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 601         struct capincci *np;
 602         unsigned long flags;
 603
 604         mutex_lock(&cdev->lock);
 605
 606         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 607                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 608                 if ((info & 0xff00) == 0)
 609                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 610         }
 611         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 612                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 613
 614         spin_lock_irqsave(&workaround_lock, flags);
 615         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 616                 skb_queue_tail(&cdev->recvqueue, skb);
 617                 wake_up_interruptible(&cdev->recvwait);
 618                 goto unlock_out;
 619         }
 620
 621         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 622         if (!np) {
 623                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 624                 skb_queue_tail(&cdev->recvqueue, skb);
 625                 wake_up_interruptible(&cdev->recvwait);
 626                 goto unlock_out;
 627         }
 628
 629 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 630         skb_queue_tail(&cdev->recvqueue, skb);
 631         wake_up_interruptible(&cdev->recvwait);
 632
 633 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 634
 635         mp = np->minorp;
 636         if (!mp) {
 637                 skb_queue_tail(&cdev->recvqueue, skb);
 638                 wake_up_interruptible(&cdev->recvwait);
 639                 goto unlock_out;
 640         }
 641         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 642                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 643 #ifdef _DEBUG_DATAFLOW
 644                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 645                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 646 #endif
 647                 skb_queue_tail(&mp->inqueue, skb);
 648                 mp->inbytes += skb->len;
 649                 handle_minor_recv(mp);
 650
 651         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 652
 653                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 654 #ifdef _DEBUG_DATAFLOW
 655                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 656                                 datahandle,
 657                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 658 #endif
 659                 kfree_skb(skb);
 660                 (void)capiminor_del_ack(mp, datahandle);
 661                 tty = tty_port_tty_get(&mp->port);
 662                 if (tty) {
 663                         tty_wakeup(tty);
 664                         tty_kref_put(tty);
 665                 }
 666                 (void)handle_minor_send(mp);
 667
 668         } else {
 669                 /* ups, let capi application handle it :-) */
 670                 skb_queue_tail(&cdev->recvqueue, skb);
 671                 wake_up_interruptible(&cdev->recvwait);
 672         }
 673 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 674
 675 unlock_out:
 676         spin_unlock_irqrestore(&workaround_lock, flags);
 677         mutex_unlock(&cdev->lock);
 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         int err;
 689
 690         if (!cdev->ap.applid)
 691                 return -ENODEV;
 692
 693         skb = skb_dequeue(&cdev->recvqueue);
 694         if (!skb) {
 695                 if (file->f_flags & O_NONBLOCK)
 696                         return -EAGAIN;
 697                 err = wait_event_interruptible(cdev->recvwait,
 698                                 (skb = skb_dequeue(&cdev->recvqueue)));
 699                 if (err)
 700                         return err;
 701         }
 702         if (skb->len > count) {
 703                 skb_queue_head(&cdev->recvqueue, skb);
 704                 return -EMSGSIZE;
 705         }
 706         if (copy_to_user(buf, skb->data, skb->len)) {
 707                 skb_queue_head(&cdev->recvqueue, skb);
 708                 return -EFAULT;
 709         }
 710         copied = skb->len;
 711
 712         kfree_skb(skb);
 713
 714         return copied;
 715 }
 716
 717 static ssize_t
 718 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 719 {
 720         struct capidev *cdev = (struct capidev *)file->private_data;
 721         struct sk_buff *skb;
 722         u16 mlen;
 723
 724         if (!cdev->ap.applid)
 725                 return -ENODEV;
 726
 727         skb = alloc_skb(count, GFP_USER);
 728         if (!skb)
 729                 return -ENOMEM;
 730
 731         if (copy_from_user(skb_put(skb, count), buf, count)) {
 732                 kfree_skb(skb);
 733                 return -EFAULT;
 734         }
 735         mlen = CAPIMSG_LEN(skb->data);
 736         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 737                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 738                         kfree_skb(skb);
 739                         return -EINVAL;
 740                 }
 741         } else {
 742                 if (mlen != count) {
 743                         kfree_skb(skb);
 744                         return -EINVAL;
 745                 }
 746         }
 747         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 748
 749         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 750                 mutex_lock(&cdev->lock);
 751                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 752                 mutex_unlock(&cdev->lock);
 753         }
 754
 755         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 756
 757         if (cdev->errcode) {
 758                 kfree_skb(skb);
 759                 return -EIO;
 760         }
 761         return count;
 762 }
 763
 764 static unsigned int
 765 capi_poll(struct file *file, poll_table * wait)
 766 {
 767         struct capidev *cdev = (struct capidev *)file->private_data;
 768         unsigned int mask = 0;
 769
 770         if (!cdev->ap.applid)
 771                 return POLLERR;
 772
 773         poll_wait(file, &(cdev->recvwait), wait);
 774         mask = POLLOUT | POLLWRNORM;
 775         if (!skb_queue_empty(&cdev->recvqueue))
 776                 mask |= POLLIN | POLLRDNORM;
 777         return mask;
 778 }
 779
 780 static int
 781 capi_ioctl(struct inode *inode, struct file *file,
 782            unsigned int cmd, unsigned long arg)
 783 {
 784         struct capidev *cdev = file->private_data;
 785         capi_ioctl_struct data;
 786         int retval = -EINVAL;
 787         void __user *argp = (void __user *)arg;
 788
 789         switch (cmd) {
 790         case CAPI_REGISTER:
 791                 mutex_lock(&cdev->lock);
 792
 793                 if (cdev->ap.applid) {
 794                         retval = -EEXIST;
 795                         goto register_out;
 796                 }
 797                 if (copy_from_user(&cdev->ap.rparam, argp,
 798                                    sizeof(struct capi_register_params))) {
 799                         retval = -EFAULT;
 800                         goto register_out;
 801                 }
 802                 cdev->ap.private = cdev;
 803                 cdev->ap.recv_message = capi_recv_message;
 804                 cdev->errcode = capi20_register(&cdev->ap);
 805                 retval = (int)cdev->ap.applid;
 806                 if (cdev->errcode) {
 807                         cdev->ap.applid = 0;
 808                         retval = -EIO;
 809                 }
 810
 811 register_out:
 812                 mutex_unlock(&cdev->lock);
 813                 return retval;
 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                 unsigned userflags;
 914
 915                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 916                         return -EFAULT;
 917
 918                 mutex_lock(&cdev->lock);
 919                 if (cmd == CAPI_SET_FLAGS)
 920                         cdev->userflags |= userflags;
 921                 else
 922                         cdev->userflags &= ~userflags;
 923                 mutex_unlock(&cdev->lock);
 924                 return 0;
 925         }
 926         case CAPI_GET_FLAGS:
 927                 if (copy_to_user(argp, &cdev->userflags,
 928                                  sizeof(cdev->userflags)))
 929                         return -EFAULT;
 930                 return 0;
 931
 932         case CAPI_NCCI_OPENCOUNT: {
 933                 struct capincci *nccip;
 934                 unsigned ncci;
 935                 int count = 0;
 936
 937                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 938                         return -EFAULT;
 939
 940                 mutex_lock(&cdev->lock);
 941                 nccip = capincci_find(cdev, (u32)ncci);
 942                 if (nccip)
 943                         count = capincci_minor_opencount(nccip);
 944                 mutex_unlock(&cdev->lock);
 945                 return count;
 946         }
 947
 948 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 949         case CAPI_NCCI_GETUNIT: {
 950                 struct capincci *nccip;
 951                 struct capiminor *mp;
 952                 unsigned ncci;
 953                 int unit = -ESRCH;
 954
 955                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 956                         return -EFAULT;
 957
 958                 mutex_lock(&cdev->lock);
 959                 nccip = capincci_find(cdev, (u32)ncci);
 960                 if (nccip) {
 961                         mp = nccip->minorp;
 962                         if (mp)
 963                                 unit = mp->minor;
 964                 }
 965                 mutex_unlock(&cdev->lock);
 966                 return unit;
 967         }
 968 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 969
 970         default:
 971                 return -EINVAL;
 972         }
 973 }
 974
 975 static int capi_open(struct inode *inode, struct file *file)
 976 {
 977         struct capidev *cdev;
 978
 979         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 980         if (!cdev)
 981                 return -ENOMEM;
 982
 983         mutex_init(&cdev->lock);
 984         skb_queue_head_init(&cdev->recvqueue);
 985         init_waitqueue_head(&cdev->recvwait);
 986         INIT_LIST_HEAD(&cdev->nccis);
 987         file->private_data = cdev;
 988
 989         mutex_lock(&capidev_list_lock);
 990         list_add_tail(&cdev->list, &capidev_list);
 991         mutex_unlock(&capidev_list_lock);
 992
 993         return nonseekable_open(inode, file);
 994 }
 995
 996 static int capi_release(struct inode *inode, struct file *file)
 997 {
 998         struct capidev *cdev = file->private_data;
 999
1000         mutex_lock(&capidev_list_lock);
1001         list_del(&cdev->list);
1002         mutex_unlock(&capidev_list_lock);
1003
1004         if (cdev->ap.applid)
1005                 capi20_release(&cdev->ap);
1006         skb_queue_purge(&cdev->recvqueue);
1007         capincci_free(cdev, 0xffffffff);
1008
1009         kfree(cdev);
1010         return 0;
1011 }
1012
1013 static const struct file_operations capi_fops =
1014 {
1015         .owner          = THIS_MODULE,
1016         .llseek         = no_llseek,
1017         .read           = capi_read,
1018         .write          = capi_write,
1019         .poll           = capi_poll,
1020         .ioctl          = capi_ioctl,
1021         .open           = capi_open,
1022         .release        = capi_release,
1023 };
1024
1025 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1026 /* -------- tty_operations for capincci ----------------------------- */
1027
1028 static int
1029 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1030 {
1031         int idx = tty->index;
1032         struct capiminor *mp = capiminor_get(idx);
1033         int ret = tty_init_termios(tty);
1034
1035         if (ret == 0) {
1036                 tty_driver_kref_get(driver);
1037                 tty->count++;
1038                 tty->driver_data = mp;
1039                 driver->ttys[idx] = tty;
1040         } else
1041                 capiminor_put(mp);
1042         return ret;
1043 }
1044
1045 static void capinc_tty_cleanup(struct tty_struct *tty)
1046 {
1047         struct capiminor *mp = tty->driver_data;
1048         tty->driver_data = NULL;
1049         capiminor_put(mp);
1050 }
1051
1052 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1053 {
1054         struct capiminor *mp = tty->driver_data;
1055         unsigned long flags;
1056         int err;
1057
1058         err = tty_port_open(&mp->port, tty, filp);
1059         if (err)
1060                 return err;
1061
1062         spin_lock_irqsave(&workaround_lock, flags);
1063         handle_minor_recv(mp);
1064         spin_unlock_irqrestore(&workaround_lock, flags);
1065         return 0;
1066 }
1067
1068 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1069 {
1070         struct capiminor *mp = tty->driver_data;
1071
1072         tty_port_close(&mp->port, tty, filp);
1073 }
1074
1075 static int capinc_tty_write(struct tty_struct *tty,
1076                             const unsigned char *buf, int count)
1077 {
1078         struct capiminor *mp = tty->driver_data;
1079         struct sk_buff *skb;
1080         unsigned long flags;
1081
1082 #ifdef _DEBUG_TTYFUNCS
1083         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1084 #endif
1085
1086         spin_lock_irqsave(&workaround_lock, flags);
1087         skb = mp->ttyskb;
1088         if (skb) {
1089                 mp->ttyskb = NULL;
1090                 skb_queue_tail(&mp->outqueue, skb);
1091                 mp->outbytes += skb->len;
1092         }
1093
1094         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1095         if (!skb) {
1096                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1097                 spin_unlock_irqrestore(&workaround_lock, flags);
1098                 return -ENOMEM;
1099         }
1100
1101         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1102         memcpy(skb_put(skb, count), buf, count);
1103
1104         skb_queue_tail(&mp->outqueue, skb);
1105         mp->outbytes += skb->len;
1106         (void)handle_minor_send(mp);
1107         spin_unlock_irqrestore(&workaround_lock, flags);
1108         return count;
1109 }
1110
1111 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1112 {
1113         struct capiminor *mp = tty->driver_data;
1114         struct sk_buff *skb;
1115         unsigned long flags;
1116         int ret = 1;
1117
1118 #ifdef _DEBUG_TTYFUNCS
1119         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1120 #endif
1121
1122         spin_lock_irqsave(&workaround_lock, flags);
1123         skb = mp->ttyskb;
1124         if (skb) {
1125                 if (skb_tailroom(skb) > 0) {
1126                         *(skb_put(skb, 1)) = ch;
1127                         spin_unlock_irqrestore(&workaround_lock, flags);
1128                         return 1;
1129                 }
1130                 mp->ttyskb = NULL;
1131                 skb_queue_tail(&mp->outqueue, skb);
1132                 mp->outbytes += skb->len;
1133                 (void)handle_minor_send(mp);
1134         }
1135         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1136         if (skb) {
1137                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1138                 *(skb_put(skb, 1)) = ch;
1139                 mp->ttyskb = skb;
1140         } else {
1141                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1142                 ret = 0;
1143         }
1144         spin_unlock_irqrestore(&workaround_lock, flags);
1145         return ret;
1146 }
1147
1148 static void capinc_tty_flush_chars(struct tty_struct *tty)
1149 {
1150         struct capiminor *mp = tty->driver_data;
1151         struct sk_buff *skb;
1152         unsigned long flags;
1153
1154 #ifdef _DEBUG_TTYFUNCS
1155         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1156 #endif
1157
1158         spin_lock_irqsave(&workaround_lock, flags);
1159         skb = mp->ttyskb;
1160         if (skb) {
1161                 mp->ttyskb = NULL;
1162                 skb_queue_tail(&mp->outqueue, skb);
1163                 mp->outbytes += skb->len;
1164                 (void)handle_minor_send(mp);
1165         }
1166         (void)handle_minor_recv(mp);
1167         spin_unlock_irqrestore(&workaround_lock, flags);
1168 }
1169
1170 static int capinc_tty_write_room(struct tty_struct *tty)
1171 {
1172         struct capiminor *mp = tty->driver_data;
1173         int room;
1174
1175         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1176         room *= CAPI_MAX_BLKSIZE;
1177 #ifdef _DEBUG_TTYFUNCS
1178         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1179 #endif
1180         return room;
1181 }
1182
1183 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1184 {
1185         struct capiminor *mp = tty->driver_data;
1186
1187 #ifdef _DEBUG_TTYFUNCS
1188         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1189                         mp->outbytes, mp->nack,
1190                         skb_queue_len(&mp->outqueue),
1191                         skb_queue_len(&mp->inqueue));
1192 #endif
1193         return mp->outbytes;
1194 }
1195
1196 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1197                     unsigned int cmd, unsigned long arg)
1198 {
1199         int error = 0;
1200         switch (cmd) {
1201         default:
1202                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1203                 break;
1204         }
1205         return error;
1206 }
1207
1208 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1209 {
1210 #ifdef _DEBUG_TTYFUNCS
1211         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1212 #endif
1213 }
1214
1215 static void capinc_tty_throttle(struct tty_struct *tty)
1216 {
1217         struct capiminor *mp = tty->driver_data;
1218 #ifdef _DEBUG_TTYFUNCS
1219         printk(KERN_DEBUG "capinc_tty_throttle\n");
1220 #endif
1221         mp->ttyinstop = 1;
1222 }
1223
1224 static void capinc_tty_unthrottle(struct tty_struct *tty)
1225 {
1226         struct capiminor *mp = tty->driver_data;
1227         unsigned long flags;
1228
1229 #ifdef _DEBUG_TTYFUNCS
1230         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1231 #endif
1232         spin_lock_irqsave(&workaround_lock, flags);
1233         mp->ttyinstop = 0;
1234         handle_minor_recv(mp);
1235         spin_unlock_irqrestore(&workaround_lock, flags);
1236 }
1237
1238 static void capinc_tty_stop(struct tty_struct *tty)
1239 {
1240         struct capiminor *mp = tty->driver_data;
1241
1242 #ifdef _DEBUG_TTYFUNCS
1243         printk(KERN_DEBUG "capinc_tty_stop\n");
1244 #endif
1245         mp->ttyoutstop = 1;
1246 }
1247
1248 static void capinc_tty_start(struct tty_struct *tty)
1249 {
1250         struct capiminor *mp = tty->driver_data;
1251         unsigned long flags;
1252
1253 #ifdef _DEBUG_TTYFUNCS
1254         printk(KERN_DEBUG "capinc_tty_start\n");
1255 #endif
1256         spin_lock_irqsave(&workaround_lock, flags);
1257         mp->ttyoutstop = 0;
1258         (void)handle_minor_send(mp);
1259         spin_unlock_irqrestore(&workaround_lock, flags);
1260 }
1261
1262 static void capinc_tty_hangup(struct tty_struct *tty)
1263 {
1264         struct capiminor *mp = tty->driver_data;
1265
1266 #ifdef _DEBUG_TTYFUNCS
1267         printk(KERN_DEBUG "capinc_tty_hangup\n");
1268 #endif
1269         tty_port_hangup(&mp->port);
1270 }
1271
1272 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1273 {
1274 #ifdef _DEBUG_TTYFUNCS
1275         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1276 #endif
1277         return 0;
1278 }
1279
1280 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1281 {
1282 #ifdef _DEBUG_TTYFUNCS
1283         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1284 #endif
1285 }
1286
1287 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1288 {
1289 #ifdef _DEBUG_TTYFUNCS
1290         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1291 #endif
1292 }
1293
1294 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1295 {
1296 #ifdef _DEBUG_TTYFUNCS
1297         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1298 #endif
1299 }
1300
1301 static const struct tty_operations capinc_ops = {
1302         .open = capinc_tty_open,
1303         .close = capinc_tty_close,
1304         .write = capinc_tty_write,
1305         .put_char = capinc_tty_put_char,
1306         .flush_chars = capinc_tty_flush_chars,
1307         .write_room = capinc_tty_write_room,
1308         .chars_in_buffer = capinc_tty_chars_in_buffer,
1309         .ioctl = capinc_tty_ioctl,
1310         .set_termios = capinc_tty_set_termios,
1311         .throttle = capinc_tty_throttle,
1312         .unthrottle = capinc_tty_unthrottle,
1313         .stop = capinc_tty_stop,
1314         .start = capinc_tty_start,
1315         .hangup = capinc_tty_hangup,
1316         .break_ctl = capinc_tty_break_ctl,
1317         .flush_buffer = capinc_tty_flush_buffer,
1318         .set_ldisc = capinc_tty_set_ldisc,
1319         .send_xchar = capinc_tty_send_xchar,
1320         .install = capinc_tty_install,
1321         .cleanup = capinc_tty_cleanup,
1322 };
1323
1324 static int __init capinc_tty_init(void)
1325 {
1326         struct tty_driver *drv;
1327         int err;
1328
1329         if (capi_ttyminors > CAPINC_MAX_PORTS)
1330                 capi_ttyminors = CAPINC_MAX_PORTS;
1331         if (capi_ttyminors <= 0)
1332                 capi_ttyminors = CAPINC_NR_PORTS;
1333
1334         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1335                              GFP_KERNEL);
1336         if (!capiminors)
1337                 return -ENOMEM;
1338
1339         drv = alloc_tty_driver(capi_ttyminors);
1340         if (!drv) {
1341                 kfree(capiminors);
1342                 return -ENOMEM;
1343         }
1344         drv->owner = THIS_MODULE;
1345         drv->driver_name = "capi_nc";
1346         drv->name = "capi";
1347         drv->major = 0;
1348         drv->minor_start = 0;
1349         drv->type = TTY_DRIVER_TYPE_SERIAL;
1350         drv->subtype = SERIAL_TYPE_NORMAL;
1351         drv->init_termios = tty_std_termios;
1352         drv->init_termios.c_iflag = ICRNL;
1353         drv->init_termios.c_oflag = OPOST | ONLCR;
1354         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1355         drv->init_termios.c_lflag = 0;
1356         drv->flags =
1357                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1358                 TTY_DRIVER_DYNAMIC_DEV;
1359         tty_set_operations(drv, &capinc_ops);
1360
1361         err = tty_register_driver(drv);
1362         if (err) {
1363                 put_tty_driver(drv);
1364                 kfree(capiminors);
1365                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1366                 return err;
1367         }
1368         capinc_tty_driver = drv;
1369         return 0;
1370 }
1371
1372 static void __exit capinc_tty_exit(void)
1373 {
1374         tty_unregister_driver(capinc_tty_driver);
1375         put_tty_driver(capinc_tty_driver);
1376         kfree(capiminors);
1377 }
1378
1379 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1380
1381 static inline int capinc_tty_init(void)
1382 {
1383         return 0;
1384 }
1385
1386 static inline void capinc_tty_exit(void) { }
1387
1388 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1389
1390 /* -------- /proc functions ----------------------------------------- */
1391
1392 /*
1393  * /proc/capi/capi20:
1394  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1395  */
1396 static int capi20_proc_show(struct seq_file *m, void *v)
1397 {
1398         struct capidev *cdev;
1399         struct list_head *l;
1400
1401         mutex_lock(&capidev_list_lock);
1402         list_for_each(l, &capidev_list) {
1403                 cdev = list_entry(l, struct capidev, list);
1404                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1405                         cdev->ap.applid,
1406                         cdev->ap.nrecvctlpkt,
1407                         cdev->ap.nrecvdatapkt,
1408                         cdev->ap.nsentctlpkt,
1409                         cdev->ap.nsentdatapkt);
1410         }
1411         mutex_unlock(&capidev_list_lock);
1412         return 0;
1413 }
1414
1415 static int capi20_proc_open(struct inode *inode, struct file *file)
1416 {
1417         return single_open(file, capi20_proc_show, NULL);
1418 }
1419
1420 static const struct file_operations capi20_proc_fops = {
1421         .owner          = THIS_MODULE,
1422         .open           = capi20_proc_open,
1423         .read           = seq_read,
1424         .llseek         = seq_lseek,
1425         .release        = single_release,
1426 };
1427
1428 /*
1429  * /proc/capi/capi20ncci:
1430  *  applid ncci
1431  */
1432 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1433 {
1434         struct capidev *cdev;
1435         struct capincci *np;
1436
1437         mutex_lock(&capidev_list_lock);
1438         list_for_each_entry(cdev, &capidev_list, list) {
1439                 mutex_lock(&cdev->lock);
1440                 list_for_each_entry(np, &cdev->nccis, list)
1441                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1442                 mutex_unlock(&cdev->lock);
1443         }
1444         mutex_unlock(&capidev_list_lock);
1445         return 0;
1446 }
1447
1448 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1449 {
1450         return single_open(file, capi20ncci_proc_show, NULL);
1451 }
1452
1453 static const struct file_operations capi20ncci_proc_fops = {
1454         .owner          = THIS_MODULE,
1455         .open           = capi20ncci_proc_open,
1456         .read           = seq_read,
1457         .llseek         = seq_lseek,
1458         .release        = single_release,
1459 };
1460
1461 static void __init proc_init(void)
1462 {
1463         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1464         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1465 }
1466
1467 static void __exit proc_exit(void)
1468 {
1469         remove_proc_entry("capi/capi20", NULL);
1470         remove_proc_entry("capi/capi20ncci", NULL);
1471 }
1472
1473 /* -------- init function and module interface ---------------------- */
1474
1475
1476 static int __init capi_init(void)
1477 {
1478         const char *compileinfo;
1479         int major_ret;
1480
1481         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1482         if (major_ret < 0) {
1483                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1484                 return major_ret;
1485         }
1486         capi_class = class_create(THIS_MODULE, "capi");
1487         if (IS_ERR(capi_class)) {
1488                 unregister_chrdev(capi_major, "capi20");
1489                 return PTR_ERR(capi_class);
1490         }
1491
1492         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1493
1494         if (capinc_tty_init() < 0) {
1495                 device_destroy(capi_class, MKDEV(capi_major, 0));
1496                 class_destroy(capi_class);
1497                 unregister_chrdev(capi_major, "capi20");
1498                 return -ENOMEM;
1499         }
1500
1501         proc_init();
1502
1503 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1504         compileinfo = " (middleware+capifs)";
1505 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1506         compileinfo = " (no capifs)";
1507 #else
1508         compileinfo = " (no middleware)";
1509 #endif
1510         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1511                capi_major, compileinfo);
1512
1513         return 0;
1514 }
1515
1516 static void __exit capi_exit(void)
1517 {
1518         proc_exit();
1519
1520         device_destroy(capi_class, MKDEV(capi_major, 0));
1521         class_destroy(capi_class);
1522         unregister_chrdev(capi_major, "capi20");
1523
1524         capinc_tty_exit();
1525 }
1526
1527 module_init(capi_init);
1528 module_exit(capi_exit);