drivers/isdn/capi/capi.c

   1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
   2  *
   3  * CAPI 2.0 Interface for Linux
   4  *
   5  * Copyright 1996 by Carsten Paeth <calle@calle.de>
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/major.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/fs.h>
  20 #include <linux/signal.h>
  21 #include <linux/mutex.h>
  22 #include <linux/mm.h>
  23 #include <linux/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 ackqueue_entry {
  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         atomic_t                datahandle;
  93         atomic_t                msgid;
  94
  95         struct tty_port port;
  96         int                ttyinstop;
  97         int                ttyoutstop;
  98
  99         struct sk_buff_head     inqueue;
 100
 101         struct sk_buff_head     outqueue;
 102         int                     outbytes;
 103         struct sk_buff          *outskb;
 104         spinlock_t              outlock;
 105
 106         /* transmit path */
 107         struct list_head ackqueue;
 108         int nack;
 109         spinlock_t ackqlock;
 110 };
 111
 112 struct capincci {
 113         struct list_head list;
 114         u32              ncci;
 115         struct capidev  *cdev;
 116 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 117         struct capiminor *minorp;
 118 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 119 };
 120
 121 struct capidev {
 122         struct list_head list;
 123         struct capi20_appl ap;
 124         u16             errcode;
 125         unsigned        userflags;
 126
 127         struct sk_buff_head recvqueue;
 128         wait_queue_head_t recvwait;
 129
 130         struct list_head nccis;
 131
 132         struct mutex lock;
 133 };
 134
 135 /* -------- global variables ---------------------------------------- */
 136
 137 static DEFINE_MUTEX(capidev_list_lock);
 138 static LIST_HEAD(capidev_list);
 139
 140 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 141
 142 static DEFINE_SPINLOCK(capiminors_lock);
 143 static struct capiminor **capiminors;
 144
 145 static struct tty_driver *capinc_tty_driver;
 146
 147 /* -------- datahandles --------------------------------------------- */
 148
 149 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 150 {
 151         struct ackqueue_entry *n;
 152
 153         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 154         if (unlikely(!n)) {
 155                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 156                 return -1;
 157         }
 158         n->datahandle = datahandle;
 159         INIT_LIST_HEAD(&n->list);
 160         spin_lock_bh(&mp->ackqlock);
 161         list_add_tail(&n->list, &mp->ackqueue);
 162         mp->nack++;
 163         spin_unlock_bh(&mp->ackqlock);
 164         return 0;
 165 }
 166
 167 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 168 {
 169         struct ackqueue_entry *p, *tmp;
 170
 171         spin_lock_bh(&mp->ackqlock);
 172         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 173                 if (p->datahandle == datahandle) {
 174                         list_del(&p->list);
 175                         mp->nack--;
 176                         spin_unlock_bh(&mp->ackqlock);
 177                         kfree(p);
 178                         return 0;
 179                 }
 180         }
 181         spin_unlock_bh(&mp->ackqlock);
 182         return -1;
 183 }
 184
 185 static void capiminor_del_all_ack(struct capiminor *mp)
 186 {
 187         struct ackqueue_entry *p, *tmp;
 188
 189         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 190                 list_del(&p->list);
 191                 kfree(p);
 192                 mp->nack--;
 193         }
 194 }
 195
 196
 197 /* -------- struct capiminor ---------------------------------------- */
 198
 199 static const struct tty_port_operations capiminor_port_ops; /* we have none */
 200
 201 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 202 {
 203         struct capiminor *mp;
 204         struct device *dev;
 205         unsigned int minor;
 206
 207         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 208         if (!mp) {
 209                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 210                 return NULL;
 211         }
 212
 213         kref_init(&mp->kref);
 214
 215         mp->ap = ap;
 216         mp->ncci = ncci;
 217         INIT_LIST_HEAD(&mp->ackqueue);
 218         spin_lock_init(&mp->ackqlock);
 219
 220         skb_queue_head_init(&mp->inqueue);
 221         skb_queue_head_init(&mp->outqueue);
 222         spin_lock_init(&mp->outlock);
 223
 224         tty_port_init(&mp->port);
 225         mp->port.ops = &capiminor_port_ops;
 226
 227         /* Allocate the least unused minor number. */
 228         spin_lock(&capiminors_lock);
 229         for (minor = 0; minor < capi_ttyminors; minor++)
 230                 if (!capiminors[minor]) {
 231                         capiminors[minor] = mp;
 232                         break;
 233                 }
 234         spin_unlock(&capiminors_lock);
 235
 236         if (minor == capi_ttyminors) {
 237                 printk(KERN_NOTICE "capi: out of minors\n");
 238                 goto err_out1;
 239         }
 240
 241         mp->minor = minor;
 242
 243         dev = tty_register_device(capinc_tty_driver, minor, NULL);
 244         if (IS_ERR(dev))
 245                 goto err_out2;
 246
 247         return mp;
 248
 249 err_out2:
 250         spin_lock(&capiminors_lock);
 251         capiminors[minor] = NULL;
 252         spin_unlock(&capiminors_lock);
 253
 254 err_out1:
 255         kfree(mp);
 256         return NULL;
 257 }
 258
 259 static void capiminor_destroy(struct kref *kref)
 260 {
 261         struct capiminor *mp = container_of(kref, struct capiminor, kref);
 262
 263         kfree_skb(mp->outskb);
 264         skb_queue_purge(&mp->inqueue);
 265         skb_queue_purge(&mp->outqueue);
 266         capiminor_del_all_ack(mp);
 267         kfree(mp);
 268 }
 269
 270 static struct capiminor *capiminor_get(unsigned int minor)
 271 {
 272         struct capiminor *mp;
 273
 274         spin_lock(&capiminors_lock);
 275         mp = capiminors[minor];
 276         if (mp)
 277                 kref_get(&mp->kref);
 278         spin_unlock(&capiminors_lock);
 279
 280         return mp;
 281 }
 282
 283 static inline void capiminor_put(struct capiminor *mp)
 284 {
 285         kref_put(&mp->kref, capiminor_destroy);
 286 }
 287
 288 static void capiminor_free(struct capiminor *mp)
 289 {
 290         tty_unregister_device(capinc_tty_driver, mp->minor);
 291
 292         spin_lock(&capiminors_lock);
 293         capiminors[mp->minor] = NULL;
 294         spin_unlock(&capiminors_lock);
 295
 296         capiminor_put(mp);
 297 }
 298
 299 /* -------- struct capincci ----------------------------------------- */
 300
 301 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 302 {
 303         struct capiminor *mp;
 304         dev_t device;
 305
 306         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 307                 return;
 308
 309         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 310         if (mp) {
 311                 device = MKDEV(capinc_tty_driver->major, mp->minor);
 312                 mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
 313         }
 314 }
 315
 316 static void capincci_free_minor(struct capincci *np)
 317 {
 318         struct capiminor *mp = np->minorp;
 319         struct tty_struct *tty;
 320
 321         if (mp) {
 322                 capifs_free_ncci(mp->capifs_dentry);
 323
 324                 tty = tty_port_tty_get(&mp->port);
 325                 if (tty) {
 326                         tty_vhangup(tty);
 327                         tty_kref_put(tty);
 328                 }
 329
 330                 capiminor_free(mp);
 331         }
 332 }
 333
 334 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 335 {
 336         struct capiminor *mp = np->minorp;
 337         unsigned int count = 0;
 338         struct tty_struct *tty;
 339
 340         if (mp) {
 341                 tty = tty_port_tty_get(&mp->port);
 342                 if (tty) {
 343                         count = tty->count;
 344                         tty_kref_put(tty);
 345                 }
 346         }
 347         return count;
 348 }
 349
 350 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 351
 352 static inline void
 353 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 354 static inline void capincci_free_minor(struct capincci *np) { }
 355
 356 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 357 {
 358         return 0;
 359 }
 360
 361 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 362
 363 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 364 {
 365         struct capincci *np;
 366
 367         np = kzalloc(sizeof(*np), GFP_KERNEL);
 368         if (!np)
 369                 return NULL;
 370         np->ncci = ncci;
 371         np->cdev = cdev;
 372
 373         capincci_alloc_minor(cdev, np);
 374
 375         list_add_tail(&np->list, &cdev->nccis);
 376
 377         return np;
 378 }
 379
 380 static void capincci_free(struct capidev *cdev, u32 ncci)
 381 {
 382         struct capincci *np, *tmp;
 383
 384         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 385                 if (ncci == 0xffffffff || np->ncci == ncci) {
 386                         capincci_free_minor(np);
 387                         list_del(&np->list);
 388                         kfree(np);
 389                 }
 390 }
 391
 392 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 393 {
 394         struct capincci *np;
 395
 396         list_for_each_entry(np, &cdev->nccis, list)
 397                 if (np->ncci == ncci)
 398                         return np;
 399         return NULL;
 400 }
 401
 402 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 403 /* -------- handle data queue --------------------------------------- */
 404
 405 static struct sk_buff *
 406 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 407 {
 408         struct sk_buff *nskb;
 409         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
 410         if (nskb) {
 411                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 412                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 413                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 414                 capimsg_setu16(s, 2, mp->ap->applid);
 415                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 416                 capimsg_setu8 (s, 5, CAPI_RESP);
 417                 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
 418                 capimsg_setu32(s, 8, mp->ncci);
 419                 capimsg_setu16(s, 12, datahandle);
 420         }
 421         return nskb;
 422 }
 423
 424 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 425 {
 426         unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
 427         struct tty_struct *tty;
 428         struct sk_buff *nskb;
 429         u16 errcode, datahandle;
 430         struct tty_ldisc *ld;
 431         int ret = -1;
 432
 433         tty = tty_port_tty_get(&mp->port);
 434         if (!tty) {
 435 #ifdef _DEBUG_DATAFLOW
 436                 printk(KERN_DEBUG "capi: currently no receiver\n");
 437 #endif
 438                 return -1;
 439         }
 440
 441         ld = tty_ldisc_ref(tty);
 442         if (!ld) {
 443                 /* fatal error, do not requeue */
 444                 ret = 0;
 445                 kfree_skb(skb);
 446                 goto deref_tty;
 447         }
 448
 449         if (ld->ops->receive_buf == NULL) {
 450 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 451                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 452 #endif
 453                 /* fatal error, do not requeue */
 454                 goto free_skb;
 455         }
 456         if (mp->ttyinstop) {
 457 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 458                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 459 #endif
 460                 goto deref_ldisc;
 461         }
 462
 463         if (tty->receive_room < datalen) {
 464 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 465                 printk(KERN_DEBUG "capi: no room in tty\n");
 466 #endif
 467                 goto deref_ldisc;
 468         }
 469
 470         nskb = gen_data_b3_resp_for(mp, skb);
 471         if (!nskb) {
 472                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 473                 goto deref_ldisc;
 474         }
 475
 476         datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 477
 478         errcode = capi20_put_message(mp->ap, nskb);
 479
 480         if (errcode == CAPI_NOERROR) {
 481                 skb_pull(skb, CAPIMSG_LEN(skb->data));
 482 #ifdef _DEBUG_DATAFLOW
 483                 printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 484                                         datahandle, skb->len);
 485 #endif
 486                 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 487         } else {
 488                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 489                                 errcode);
 490                 kfree_skb(nskb);
 491
 492                 if (errcode == CAPI_SENDQUEUEFULL)
 493                         goto deref_ldisc;
 494         }
 495
 496 free_skb:
 497         ret = 0;
 498         kfree_skb(skb);
 499
 500 deref_ldisc:
 501         tty_ldisc_deref(ld);
 502
 503 deref_tty:
 504         tty_kref_put(tty);
 505         return ret;
 506 }
 507
 508 static void handle_minor_recv(struct capiminor *mp)
 509 {
 510         struct sk_buff *skb;
 511
 512         while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
 513                 if (handle_recv_skb(mp, skb) < 0) {
 514                         skb_queue_head(&mp->inqueue, skb);
 515                         return;
 516                 }
 517 }
 518
 519 static void handle_minor_send(struct capiminor *mp)
 520 {
 521         struct tty_struct *tty;
 522         struct sk_buff *skb;
 523         u16 len;
 524         u16 errcode;
 525         u16 datahandle;
 526
 527         tty = tty_port_tty_get(&mp->port);
 528         if (!tty)
 529                 return;
 530
 531         if (mp->ttyoutstop) {
 532 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 533                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 534 #endif
 535                 tty_kref_put(tty);
 536                 return;
 537         }
 538
 539         while (1) {
 540                 spin_lock_bh(&mp->outlock);
 541                 skb = __skb_dequeue(&mp->outqueue);
 542                 if (!skb) {
 543                         spin_unlock_bh(&mp->outlock);
 544                         break;
 545                 }
 546                 len = (u16)skb->len;
 547                 mp->outbytes -= len;
 548                 spin_unlock_bh(&mp->outlock);
 549
 550                 datahandle = atomic_inc_return(&mp->datahandle);
 551                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 552                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 553                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 554                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 555                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 556                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 557                 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
 558                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 559                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 560                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 561                 capimsg_setu16(skb->data, 18, datahandle);
 562                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 563
 564                 if (capiminor_add_ack(mp, datahandle) < 0) {
 565                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 566
 567                         spin_lock_bh(&mp->outlock);
 568                         __skb_queue_head(&mp->outqueue, skb);
 569                         mp->outbytes += len;
 570                         spin_unlock_bh(&mp->outlock);
 571
 572                         break;
 573                 }
 574                 errcode = capi20_put_message(mp->ap, skb);
 575                 if (errcode == CAPI_NOERROR) {
 576 #ifdef _DEBUG_DATAFLOW
 577                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 578                                                         datahandle, len);
 579 #endif
 580                         continue;
 581                 }
 582                 capiminor_del_ack(mp, datahandle);
 583
 584                 if (errcode == CAPI_SENDQUEUEFULL) {
 585                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 586
 587                         spin_lock_bh(&mp->outlock);
 588                         __skb_queue_head(&mp->outqueue, skb);
 589                         mp->outbytes += len;
 590                         spin_unlock_bh(&mp->outlock);
 591
 592                         break;
 593                 }
 594
 595                 /* ups, drop packet */
 596                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 597                 kfree_skb(skb);
 598         }
 599         tty_kref_put(tty);
 600 }
 601
 602 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 603 /* -------- function called by lower level -------------------------- */
 604
 605 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 606 {
 607         struct capidev *cdev = ap->private;
 608 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 609         struct tty_struct *tty;
 610         struct capiminor *mp;
 611         u16 datahandle;
 612 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 613         struct capincci *np;
 614
 615         mutex_lock(&cdev->lock);
 616
 617         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 618                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 619                 if ((info & 0xff00) == 0)
 620                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 621         }
 622         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 623                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 624
 625         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 626                 skb_queue_tail(&cdev->recvqueue, skb);
 627                 wake_up_interruptible(&cdev->recvwait);
 628                 goto unlock_out;
 629         }
 630
 631         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 632         if (!np) {
 633                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 634                 skb_queue_tail(&cdev->recvqueue, skb);
 635                 wake_up_interruptible(&cdev->recvwait);
 636                 goto unlock_out;
 637         }
 638
 639 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 640         skb_queue_tail(&cdev->recvqueue, skb);
 641         wake_up_interruptible(&cdev->recvwait);
 642
 643 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 644
 645         mp = np->minorp;
 646         if (!mp) {
 647                 skb_queue_tail(&cdev->recvqueue, skb);
 648                 wake_up_interruptible(&cdev->recvwait);
 649                 goto unlock_out;
 650         }
 651         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 652                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 653 #ifdef _DEBUG_DATAFLOW
 654                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 655                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 656 #endif
 657                 skb_queue_tail(&mp->inqueue, skb);
 658
 659                 handle_minor_recv(mp);
 660
 661         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 662
 663                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 664 #ifdef _DEBUG_DATAFLOW
 665                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 666                                 datahandle,
 667                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 668 #endif
 669                 kfree_skb(skb);
 670                 capiminor_del_ack(mp, datahandle);
 671                 tty = tty_port_tty_get(&mp->port);
 672                 if (tty) {
 673                         tty_wakeup(tty);
 674                         tty_kref_put(tty);
 675                 }
 676                 handle_minor_send(mp);
 677
 678         } else {
 679                 /* ups, let capi application handle it :-) */
 680                 skb_queue_tail(&cdev->recvqueue, skb);
 681                 wake_up_interruptible(&cdev->recvwait);
 682         }
 683 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 684
 685 unlock_out:
 686         mutex_unlock(&cdev->lock);
 687 }
 688
 689 /* -------- file_operations for capidev ----------------------------- */
 690
 691 static ssize_t
 692 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 693 {
 694         struct capidev *cdev = (struct capidev *)file->private_data;
 695         struct sk_buff *skb;
 696         size_t copied;
 697         int err;
 698
 699         if (!cdev->ap.applid)
 700                 return -ENODEV;
 701
 702         skb = skb_dequeue(&cdev->recvqueue);
 703         if (!skb) {
 704                 if (file->f_flags & O_NONBLOCK)
 705                         return -EAGAIN;
 706                 err = wait_event_interruptible(cdev->recvwait,
 707                                 (skb = skb_dequeue(&cdev->recvqueue)));
 708                 if (err)
 709                         return err;
 710         }
 711         if (skb->len > count) {
 712                 skb_queue_head(&cdev->recvqueue, skb);
 713                 return -EMSGSIZE;
 714         }
 715         if (copy_to_user(buf, skb->data, skb->len)) {
 716                 skb_queue_head(&cdev->recvqueue, skb);
 717                 return -EFAULT;
 718         }
 719         copied = skb->len;
 720
 721         kfree_skb(skb);
 722
 723         return copied;
 724 }
 725
 726 static ssize_t
 727 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 728 {
 729         struct capidev *cdev = (struct capidev *)file->private_data;
 730         struct sk_buff *skb;
 731         u16 mlen;
 732
 733         if (!cdev->ap.applid)
 734                 return -ENODEV;
 735
 736         skb = alloc_skb(count, GFP_USER);
 737         if (!skb)
 738                 return -ENOMEM;
 739
 740         if (copy_from_user(skb_put(skb, count), buf, count)) {
 741                 kfree_skb(skb);
 742                 return -EFAULT;
 743         }
 744         mlen = CAPIMSG_LEN(skb->data);
 745         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 746                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 747                         kfree_skb(skb);
 748                         return -EINVAL;
 749                 }
 750         } else {
 751                 if (mlen != count) {
 752                         kfree_skb(skb);
 753                         return -EINVAL;
 754                 }
 755         }
 756         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 757
 758         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 759                 mutex_lock(&cdev->lock);
 760                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 761                 mutex_unlock(&cdev->lock);
 762         }
 763
 764         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 765
 766         if (cdev->errcode) {
 767                 kfree_skb(skb);
 768                 return -EIO;
 769         }
 770         return count;
 771 }
 772
 773 static unsigned int
 774 capi_poll(struct file *file, poll_table * wait)
 775 {
 776         struct capidev *cdev = (struct capidev *)file->private_data;
 777         unsigned int mask = 0;
 778
 779         if (!cdev->ap.applid)
 780                 return POLLERR;
 781
 782         poll_wait(file, &(cdev->recvwait), wait);
 783         mask = POLLOUT | POLLWRNORM;
 784         if (!skb_queue_empty(&cdev->recvqueue))
 785                 mask |= POLLIN | POLLRDNORM;
 786         return mask;
 787 }
 788
 789 static int
 790 capi_ioctl(struct inode *inode, struct file *file,
 791            unsigned int cmd, unsigned long arg)
 792 {
 793         struct capidev *cdev = file->private_data;
 794         capi_ioctl_struct data;
 795         int retval = -EINVAL;
 796         void __user *argp = (void __user *)arg;
 797
 798         switch (cmd) {
 799         case CAPI_REGISTER:
 800                 mutex_lock(&cdev->lock);
 801
 802                 if (cdev->ap.applid) {
 803                         retval = -EEXIST;
 804                         goto register_out;
 805                 }
 806                 if (copy_from_user(&cdev->ap.rparam, argp,
 807                                    sizeof(struct capi_register_params))) {
 808                         retval = -EFAULT;
 809                         goto register_out;
 810                 }
 811                 cdev->ap.private = cdev;
 812                 cdev->ap.recv_message = capi_recv_message;
 813                 cdev->errcode = capi20_register(&cdev->ap);
 814                 retval = (int)cdev->ap.applid;
 815                 if (cdev->errcode) {
 816                         cdev->ap.applid = 0;
 817                         retval = -EIO;
 818                 }
 819
 820 register_out:
 821                 mutex_unlock(&cdev->lock);
 822                 return retval;
 823
 824         case CAPI_GET_VERSION:
 825                 {
 826                         if (copy_from_user(&data.contr, argp,
 827                                                 sizeof(data.contr)))
 828                                 return -EFAULT;
 829                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 830                         if (cdev->errcode)
 831                                 return -EIO;
 832                         if (copy_to_user(argp, &data.version,
 833                                          sizeof(data.version)))
 834                                 return -EFAULT;
 835                 }
 836                 return 0;
 837
 838         case CAPI_GET_SERIAL:
 839                 {
 840                         if (copy_from_user(&data.contr, argp,
 841                                            sizeof(data.contr)))
 842                                 return -EFAULT;
 843                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 844                         if (cdev->errcode)
 845                                 return -EIO;
 846                         if (copy_to_user(argp, data.serial,
 847                                          sizeof(data.serial)))
 848                                 return -EFAULT;
 849                 }
 850                 return 0;
 851         case CAPI_GET_PROFILE:
 852                 {
 853                         if (copy_from_user(&data.contr, argp,
 854                                            sizeof(data.contr)))
 855                                 return -EFAULT;
 856
 857                         if (data.contr == 0) {
 858                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 859                                 if (cdev->errcode)
 860                                         return -EIO;
 861
 862                                 retval = copy_to_user(argp,
 863                                       &data.profile.ncontroller,
 864                                        sizeof(data.profile.ncontroller));
 865
 866                         } else {
 867                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 868                                 if (cdev->errcode)
 869                                         return -EIO;
 870
 871                                 retval = copy_to_user(argp, &data.profile,
 872                                                    sizeof(data.profile));
 873                         }
 874                         if (retval)
 875                                 return -EFAULT;
 876                 }
 877                 return 0;
 878
 879         case CAPI_GET_MANUFACTURER:
 880                 {
 881                         if (copy_from_user(&data.contr, argp,
 882                                            sizeof(data.contr)))
 883                                 return -EFAULT;
 884                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 885                         if (cdev->errcode)
 886                                 return -EIO;
 887
 888                         if (copy_to_user(argp, data.manufacturer,
 889                                          sizeof(data.manufacturer)))
 890                                 return -EFAULT;
 891
 892                 }
 893                 return 0;
 894         case CAPI_GET_ERRCODE:
 895                 data.errcode = cdev->errcode;
 896                 cdev->errcode = CAPI_NOERROR;
 897                 if (arg) {
 898                         if (copy_to_user(argp, &data.errcode,
 899                                          sizeof(data.errcode)))
 900                                 return -EFAULT;
 901                 }
 902                 return data.errcode;
 903
 904         case CAPI_INSTALLED:
 905                 if (capi20_isinstalled() == CAPI_NOERROR)
 906                         return 0;
 907                 return -ENXIO;
 908
 909         case CAPI_MANUFACTURER_CMD:
 910                 {
 911                         struct capi_manufacturer_cmd mcmd;
 912                         if (!capable(CAP_SYS_ADMIN))
 913                                 return -EPERM;
 914                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 915                                 return -EFAULT;
 916                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 917                 }
 918                 return 0;
 919
 920         case CAPI_SET_FLAGS:
 921         case CAPI_CLR_FLAGS: {
 922                 unsigned userflags;
 923
 924                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 925                         return -EFAULT;
 926
 927                 mutex_lock(&cdev->lock);
 928                 if (cmd == CAPI_SET_FLAGS)
 929                         cdev->userflags |= userflags;
 930                 else
 931                         cdev->userflags &= ~userflags;
 932                 mutex_unlock(&cdev->lock);
 933                 return 0;
 934         }
 935         case CAPI_GET_FLAGS:
 936                 if (copy_to_user(argp, &cdev->userflags,
 937                                  sizeof(cdev->userflags)))
 938                         return -EFAULT;
 939                 return 0;
 940
 941         case CAPI_NCCI_OPENCOUNT: {
 942                 struct capincci *nccip;
 943                 unsigned ncci;
 944                 int count = 0;
 945
 946                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 947                         return -EFAULT;
 948
 949                 mutex_lock(&cdev->lock);
 950                 nccip = capincci_find(cdev, (u32)ncci);
 951                 if (nccip)
 952                         count = capincci_minor_opencount(nccip);
 953                 mutex_unlock(&cdev->lock);
 954                 return count;
 955         }
 956
 957 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 958         case CAPI_NCCI_GETUNIT: {
 959                 struct capincci *nccip;
 960                 struct capiminor *mp;
 961                 unsigned ncci;
 962                 int unit = -ESRCH;
 963
 964                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 965                         return -EFAULT;
 966
 967                 mutex_lock(&cdev->lock);
 968                 nccip = capincci_find(cdev, (u32)ncci);
 969                 if (nccip) {
 970                         mp = nccip->minorp;
 971                         if (mp)
 972                                 unit = mp->minor;
 973                 }
 974                 mutex_unlock(&cdev->lock);
 975                 return unit;
 976         }
 977 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 978
 979         default:
 980                 return -EINVAL;
 981         }
 982 }
 983
 984 static int capi_open(struct inode *inode, struct file *file)
 985 {
 986         struct capidev *cdev;
 987
 988         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 989         if (!cdev)
 990                 return -ENOMEM;
 991
 992         mutex_init(&cdev->lock);
 993         skb_queue_head_init(&cdev->recvqueue);
 994         init_waitqueue_head(&cdev->recvwait);
 995         INIT_LIST_HEAD(&cdev->nccis);
 996         file->private_data = cdev;
 997
 998         mutex_lock(&capidev_list_lock);
 999         list_add_tail(&cdev->list, &capidev_list);
1000         mutex_unlock(&capidev_list_lock);
1001
1002         return nonseekable_open(inode, file);
1003 }
1004
1005 static int capi_release(struct inode *inode, struct file *file)
1006 {
1007         struct capidev *cdev = file->private_data;
1008
1009         mutex_lock(&capidev_list_lock);
1010         list_del(&cdev->list);
1011         mutex_unlock(&capidev_list_lock);
1012
1013         if (cdev->ap.applid)
1014                 capi20_release(&cdev->ap);
1015         skb_queue_purge(&cdev->recvqueue);
1016         capincci_free(cdev, 0xffffffff);
1017
1018         kfree(cdev);
1019         return 0;
1020 }
1021
1022 static const struct file_operations capi_fops =
1023 {
1024         .owner          = THIS_MODULE,
1025         .llseek         = no_llseek,
1026         .read           = capi_read,
1027         .write          = capi_write,
1028         .poll           = capi_poll,
1029         .ioctl          = capi_ioctl,
1030         .open           = capi_open,
1031         .release        = capi_release,
1032 };
1033
1034 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1035 /* -------- tty_operations for capincci ----------------------------- */
1036
1037 static int
1038 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1039 {
1040         int idx = tty->index;
1041         struct capiminor *mp = capiminor_get(idx);
1042         int ret = tty_init_termios(tty);
1043
1044         if (ret == 0) {
1045                 tty_driver_kref_get(driver);
1046                 tty->count++;
1047                 tty->driver_data = mp;
1048                 driver->ttys[idx] = tty;
1049         } else
1050                 capiminor_put(mp);
1051         return ret;
1052 }
1053
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
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
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
1081 static int capinc_tty_write(struct tty_struct *tty,
1082                             const unsigned char *buf, int count)
1083 {
1084         struct capiminor *mp = tty->driver_data;
1085         struct sk_buff *skb;
1086
1087 #ifdef _DEBUG_TTYFUNCS
1088         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1089 #endif
1090
1091         spin_lock_bh(&mp->outlock);
1092         skb = mp->outskb;
1093         if (skb) {
1094                 mp->outskb = NULL;
1095                 __skb_queue_tail(&mp->outqueue, skb);
1096                 mp->outbytes += skb->len;
1097         }
1098
1099         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1100         if (!skb) {
1101                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1102                 spin_unlock_bh(&mp->outlock);
1103                 return -ENOMEM;
1104         }
1105
1106         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1107         memcpy(skb_put(skb, count), buf, count);
1108
1109         __skb_queue_tail(&mp->outqueue, skb);
1110         mp->outbytes += skb->len;
1111         spin_unlock_bh(&mp->outlock);
1112
1113         handle_minor_send(mp);
1114
1115         return count;
1116 }
1117
1118 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1119 {
1120         struct capiminor *mp = tty->driver_data;
1121         bool invoke_send = false;
1122         struct sk_buff *skb;
1123         int ret = 1;
1124
1125 #ifdef _DEBUG_TTYFUNCS
1126         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1127 #endif
1128
1129         spin_lock_bh(&mp->outlock);
1130         skb = mp->outskb;
1131         if (skb) {
1132                 if (skb_tailroom(skb) > 0) {
1133                         *(skb_put(skb, 1)) = ch;
1134                         goto unlock_out;
1135                 }
1136                 mp->outskb = NULL;
1137                 __skb_queue_tail(&mp->outqueue, skb);
1138                 mp->outbytes += skb->len;
1139                 invoke_send = true;
1140         }
1141
1142         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1143         if (skb) {
1144                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1145                 *(skb_put(skb, 1)) = ch;
1146                 mp->outskb = skb;
1147         } else {
1148                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1149                 ret = 0;
1150         }
1151
1152 unlock_out:
1153         spin_unlock_bh(&mp->outlock);
1154
1155         if (invoke_send)
1156                 handle_minor_send(mp);
1157
1158         return ret;
1159 }
1160
1161 static void capinc_tty_flush_chars(struct tty_struct *tty)
1162 {
1163         struct capiminor *mp = tty->driver_data;
1164         struct sk_buff *skb;
1165
1166 #ifdef _DEBUG_TTYFUNCS
1167         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1168 #endif
1169
1170         spin_lock_bh(&mp->outlock);
1171         skb = mp->outskb;
1172         if (skb) {
1173                 mp->outskb = NULL;
1174                 __skb_queue_tail(&mp->outqueue, skb);
1175                 mp->outbytes += skb->len;
1176                 spin_unlock_bh(&mp->outlock);
1177
1178                 handle_minor_send(mp);
1179         } else
1180                 spin_unlock_bh(&mp->outlock);
1181
1182         handle_minor_recv(mp);
1183 }
1184
1185 static int capinc_tty_write_room(struct tty_struct *tty)
1186 {
1187         struct capiminor *mp = tty->driver_data;
1188         int room;
1189
1190         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1191         room *= CAPI_MAX_BLKSIZE;
1192 #ifdef _DEBUG_TTYFUNCS
1193         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1194 #endif
1195         return room;
1196 }
1197
1198 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1199 {
1200         struct capiminor *mp = tty->driver_data;
1201
1202 #ifdef _DEBUG_TTYFUNCS
1203         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1204                         mp->outbytes, mp->nack,
1205                         skb_queue_len(&mp->outqueue),
1206                         skb_queue_len(&mp->inqueue));
1207 #endif
1208         return mp->outbytes;
1209 }
1210
1211 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1212                     unsigned int cmd, unsigned long arg)
1213 {
1214         int error = 0;
1215         switch (cmd) {
1216         default:
1217                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1218                 break;
1219         }
1220         return error;
1221 }
1222
1223 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1224 {
1225 #ifdef _DEBUG_TTYFUNCS
1226         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1227 #endif
1228 }
1229
1230 static void capinc_tty_throttle(struct tty_struct *tty)
1231 {
1232         struct capiminor *mp = tty->driver_data;
1233 #ifdef _DEBUG_TTYFUNCS
1234         printk(KERN_DEBUG "capinc_tty_throttle\n");
1235 #endif
1236         mp->ttyinstop = 1;
1237 }
1238
1239 static void capinc_tty_unthrottle(struct tty_struct *tty)
1240 {
1241         struct capiminor *mp = tty->driver_data;
1242
1243 #ifdef _DEBUG_TTYFUNCS
1244         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1245 #endif
1246         mp->ttyinstop = 0;
1247         handle_minor_recv(mp);
1248 }
1249
1250 static void capinc_tty_stop(struct tty_struct *tty)
1251 {
1252         struct capiminor *mp = tty->driver_data;
1253
1254 #ifdef _DEBUG_TTYFUNCS
1255         printk(KERN_DEBUG "capinc_tty_stop\n");
1256 #endif
1257         mp->ttyoutstop = 1;
1258 }
1259
1260 static void capinc_tty_start(struct tty_struct *tty)
1261 {
1262         struct capiminor *mp = tty->driver_data;
1263
1264 #ifdef _DEBUG_TTYFUNCS
1265         printk(KERN_DEBUG "capinc_tty_start\n");
1266 #endif
1267         mp->ttyoutstop = 0;
1268         handle_minor_send(mp);
1269 }
1270
1271 static void capinc_tty_hangup(struct tty_struct *tty)
1272 {
1273         struct capiminor *mp = tty->driver_data;
1274
1275 #ifdef _DEBUG_TTYFUNCS
1276         printk(KERN_DEBUG "capinc_tty_hangup\n");
1277 #endif
1278         tty_port_hangup(&mp->port);
1279 }
1280
1281 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1282 {
1283 #ifdef _DEBUG_TTYFUNCS
1284         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1285 #endif
1286         return 0;
1287 }
1288
1289 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1290 {
1291 #ifdef _DEBUG_TTYFUNCS
1292         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1293 #endif
1294 }
1295
1296 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1297 {
1298 #ifdef _DEBUG_TTYFUNCS
1299         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1300 #endif
1301 }
1302
1303 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1304 {
1305 #ifdef _DEBUG_TTYFUNCS
1306         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1307 #endif
1308 }
1309
1310 static const struct tty_operations capinc_ops = {
1311         .open = capinc_tty_open,
1312         .close = capinc_tty_close,
1313         .write = capinc_tty_write,
1314         .put_char = capinc_tty_put_char,
1315         .flush_chars = capinc_tty_flush_chars,
1316         .write_room = capinc_tty_write_room,
1317         .chars_in_buffer = capinc_tty_chars_in_buffer,
1318         .ioctl = capinc_tty_ioctl,
1319         .set_termios = capinc_tty_set_termios,
1320         .throttle = capinc_tty_throttle,
1321         .unthrottle = capinc_tty_unthrottle,
1322         .stop = capinc_tty_stop,
1323         .start = capinc_tty_start,
1324         .hangup = capinc_tty_hangup,
1325         .break_ctl = capinc_tty_break_ctl,
1326         .flush_buffer = capinc_tty_flush_buffer,
1327         .set_ldisc = capinc_tty_set_ldisc,
1328         .send_xchar = capinc_tty_send_xchar,
1329         .install = capinc_tty_install,
1330         .cleanup = capinc_tty_cleanup,
1331 };
1332
1333 static int __init capinc_tty_init(void)
1334 {
1335         struct tty_driver *drv;
1336         int err;
1337
1338         if (capi_ttyminors > CAPINC_MAX_PORTS)
1339                 capi_ttyminors = CAPINC_MAX_PORTS;
1340         if (capi_ttyminors <= 0)
1341                 capi_ttyminors = CAPINC_NR_PORTS;
1342
1343         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1344                              GFP_KERNEL);
1345         if (!capiminors)
1346                 return -ENOMEM;
1347
1348         drv = alloc_tty_driver(capi_ttyminors);
1349         if (!drv) {
1350                 kfree(capiminors);
1351                 return -ENOMEM;
1352         }
1353         drv->owner = THIS_MODULE;
1354         drv->driver_name = "capi_nc";
1355         drv->name = "capi";
1356         drv->major = 0;
1357         drv->minor_start = 0;
1358         drv->type = TTY_DRIVER_TYPE_SERIAL;
1359         drv->subtype = SERIAL_TYPE_NORMAL;
1360         drv->init_termios = tty_std_termios;
1361         drv->init_termios.c_iflag = ICRNL;
1362         drv->init_termios.c_oflag = OPOST | ONLCR;
1363         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1364         drv->init_termios.c_lflag = 0;
1365         drv->flags =
1366                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1367                 TTY_DRIVER_DYNAMIC_DEV;
1368         tty_set_operations(drv, &capinc_ops);
1369
1370         err = tty_register_driver(drv);
1371         if (err) {
1372                 put_tty_driver(drv);
1373                 kfree(capiminors);
1374                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1375                 return err;
1376         }
1377         capinc_tty_driver = drv;
1378         return 0;
1379 }
1380
1381 static void __exit capinc_tty_exit(void)
1382 {
1383         tty_unregister_driver(capinc_tty_driver);
1384         put_tty_driver(capinc_tty_driver);
1385         kfree(capiminors);
1386 }
1387
1388 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1389
1390 static inline int capinc_tty_init(void)
1391 {
1392         return 0;
1393 }
1394
1395 static inline void capinc_tty_exit(void) { }
1396
1397 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1398
1399 /* -------- /proc functions ----------------------------------------- */
1400
1401 /*
1402  * /proc/capi/capi20:
1403  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1404  */
1405 static int capi20_proc_show(struct seq_file *m, void *v)
1406 {
1407         struct capidev *cdev;
1408         struct list_head *l;
1409
1410         mutex_lock(&capidev_list_lock);
1411         list_for_each(l, &capidev_list) {
1412                 cdev = list_entry(l, struct capidev, list);
1413                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1414                         cdev->ap.applid,
1415                         cdev->ap.nrecvctlpkt,
1416                         cdev->ap.nrecvdatapkt,
1417                         cdev->ap.nsentctlpkt,
1418                         cdev->ap.nsentdatapkt);
1419         }
1420         mutex_unlock(&capidev_list_lock);
1421         return 0;
1422 }
1423
1424 static int capi20_proc_open(struct inode *inode, struct file *file)
1425 {
1426         return single_open(file, capi20_proc_show, NULL);
1427 }
1428
1429 static const struct file_operations capi20_proc_fops = {
1430         .owner          = THIS_MODULE,
1431         .open           = capi20_proc_open,
1432         .read           = seq_read,
1433         .llseek         = seq_lseek,
1434         .release        = single_release,
1435 };
1436
1437 /*
1438  * /proc/capi/capi20ncci:
1439  *  applid ncci
1440  */
1441 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1442 {
1443         struct capidev *cdev;
1444         struct capincci *np;
1445
1446         mutex_lock(&capidev_list_lock);
1447         list_for_each_entry(cdev, &capidev_list, list) {
1448                 mutex_lock(&cdev->lock);
1449                 list_for_each_entry(np, &cdev->nccis, list)
1450                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1451                 mutex_unlock(&cdev->lock);
1452         }
1453         mutex_unlock(&capidev_list_lock);
1454         return 0;
1455 }
1456
1457 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1458 {
1459         return single_open(file, capi20ncci_proc_show, NULL);
1460 }
1461
1462 static const struct file_operations capi20ncci_proc_fops = {
1463         .owner          = THIS_MODULE,
1464         .open           = capi20ncci_proc_open,
1465         .read           = seq_read,
1466         .llseek         = seq_lseek,
1467         .release        = single_release,
1468 };
1469
1470 static void __init proc_init(void)
1471 {
1472         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1473         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1474 }
1475
1476 static void __exit proc_exit(void)
1477 {
1478         remove_proc_entry("capi/capi20", NULL);
1479         remove_proc_entry("capi/capi20ncci", NULL);
1480 }
1481
1482 /* -------- init function and module interface ---------------------- */
1483
1484
1485 static int __init capi_init(void)
1486 {
1487         const char *compileinfo;
1488         int major_ret;
1489
1490         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1491         if (major_ret < 0) {
1492                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1493                 return major_ret;
1494         }
1495         capi_class = class_create(THIS_MODULE, "capi");
1496         if (IS_ERR(capi_class)) {
1497                 unregister_chrdev(capi_major, "capi20");
1498                 return PTR_ERR(capi_class);
1499         }
1500
1501         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1502
1503         if (capinc_tty_init() < 0) {
1504                 device_destroy(capi_class, MKDEV(capi_major, 0));
1505                 class_destroy(capi_class);
1506                 unregister_chrdev(capi_major, "capi20");
1507                 return -ENOMEM;
1508         }
1509
1510         proc_init();
1511
1512 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1513         compileinfo = " (middleware+capifs)";
1514 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1515         compileinfo = " (no capifs)";
1516 #else
1517         compileinfo = " (no middleware)";
1518 #endif
1519         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1520                capi_major, compileinfo);
1521
1522         return 0;
1523 }
1524
1525 static void __exit capi_exit(void)
1526 {
1527         proc_exit();
1528
1529         device_destroy(capi_class, MKDEV(capi_major, 0));
1530         class_destroy(capi_class);
1531         unregister_chrdev(capi_major, "capi20");
1532
1533         capinc_tty_exit();
1534 }
1535
1536 module_init(capi_init);
1537 module_exit(capi_exit);