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/timer.h>
  24 #include <linux/wait.h>
  25 #include <linux/tty.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/ppp_defs.h>
  28 #include <linux/if_ppp.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/poll.h>
  33 #include <linux/capi.h>
  34 #include <linux/kernelcapi.h>
  35 #include <linux/init.h>
  36 #include <linux/device.h>
  37 #include <linux/moduleparam.h>
  38 #include <linux/isdn/capiutil.h>
  39 #include <linux/isdn/capicmd.h>
  40
  41 #include "capifs.h"
  42
  43 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  44 MODULE_AUTHOR("Carsten Paeth");
  45 MODULE_LICENSE("GPL");
  46
  47 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  48 #undef _DEBUG_DATAFLOW          /* data flow */
  49
  50 /* -------- driver information -------------------------------------- */
  51
  52 static DEFINE_MUTEX(capi_mutex);
  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 = 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 = 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 = 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 file *file, unsigned int cmd, unsigned long arg)
 791 {
 792         struct capidev *cdev = file->private_data;
 793         capi_ioctl_struct data;
 794         int retval = -EINVAL;
 795         void __user *argp = (void __user *)arg;
 796
 797         switch (cmd) {
 798         case CAPI_REGISTER:
 799                 mutex_lock(&cdev->lock);
 800
 801                 if (cdev->ap.applid) {
 802                         retval = -EEXIST;
 803                         goto register_out;
 804                 }
 805                 if (copy_from_user(&cdev->ap.rparam, argp,
 806                                    sizeof(struct capi_register_params))) {
 807                         retval = -EFAULT;
 808                         goto register_out;
 809                 }
 810                 cdev->ap.private = cdev;
 811                 cdev->ap.recv_message = capi_recv_message;
 812                 cdev->errcode = capi20_register(&cdev->ap);
 813                 retval = (int)cdev->ap.applid;
 814                 if (cdev->errcode) {
 815                         cdev->ap.applid = 0;
 816                         retval = -EIO;
 817                 }
 818
 819 register_out:
 820                 mutex_unlock(&cdev->lock);
 821                 return retval;
 822
 823         case CAPI_GET_VERSION:
 824                 {
 825                         if (copy_from_user(&data.contr, argp,
 826                                                 sizeof(data.contr)))
 827                                 return -EFAULT;
 828                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 829                         if (cdev->errcode)
 830                                 return -EIO;
 831                         if (copy_to_user(argp, &data.version,
 832                                          sizeof(data.version)))
 833                                 return -EFAULT;
 834                 }
 835                 return 0;
 836
 837         case CAPI_GET_SERIAL:
 838                 {
 839                         if (copy_from_user(&data.contr, argp,
 840                                            sizeof(data.contr)))
 841                                 return -EFAULT;
 842                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 843                         if (cdev->errcode)
 844                                 return -EIO;
 845                         if (copy_to_user(argp, data.serial,
 846                                          sizeof(data.serial)))
 847                                 return -EFAULT;
 848                 }
 849                 return 0;
 850         case CAPI_GET_PROFILE:
 851                 {
 852                         if (copy_from_user(&data.contr, argp,
 853                                            sizeof(data.contr)))
 854                                 return -EFAULT;
 855
 856                         if (data.contr == 0) {
 857                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 858                                 if (cdev->errcode)
 859                                         return -EIO;
 860
 861                                 retval = copy_to_user(argp,
 862                                       &data.profile.ncontroller,
 863                                        sizeof(data.profile.ncontroller));
 864
 865                         } else {
 866                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 867                                 if (cdev->errcode)
 868                                         return -EIO;
 869
 870                                 retval = copy_to_user(argp, &data.profile,
 871                                                    sizeof(data.profile));
 872                         }
 873                         if (retval)
 874                                 return -EFAULT;
 875                 }
 876                 return 0;
 877
 878         case CAPI_GET_MANUFACTURER:
 879                 {
 880                         if (copy_from_user(&data.contr, argp,
 881                                            sizeof(data.contr)))
 882                                 return -EFAULT;
 883                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 884                         if (cdev->errcode)
 885                                 return -EIO;
 886
 887                         if (copy_to_user(argp, data.manufacturer,
 888                                          sizeof(data.manufacturer)))
 889                                 return -EFAULT;
 890
 891                 }
 892                 return 0;
 893         case CAPI_GET_ERRCODE:
 894                 data.errcode = cdev->errcode;
 895                 cdev->errcode = CAPI_NOERROR;
 896                 if (arg) {
 897                         if (copy_to_user(argp, &data.errcode,
 898                                          sizeof(data.errcode)))
 899                                 return -EFAULT;
 900                 }
 901                 return data.errcode;
 902
 903         case CAPI_INSTALLED:
 904                 if (capi20_isinstalled() == CAPI_NOERROR)
 905                         return 0;
 906                 return -ENXIO;
 907
 908         case CAPI_MANUFACTURER_CMD:
 909                 {
 910                         struct capi_manufacturer_cmd mcmd;
 911                         if (!capable(CAP_SYS_ADMIN))
 912                                 return -EPERM;
 913                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 914                                 return -EFAULT;
 915                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 916                 }
 917                 return 0;
 918
 919         case CAPI_SET_FLAGS:
 920         case CAPI_CLR_FLAGS: {
 921                 unsigned userflags;
 922
 923                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 924                         return -EFAULT;
 925
 926                 mutex_lock(&cdev->lock);
 927                 if (cmd == CAPI_SET_FLAGS)
 928                         cdev->userflags |= userflags;
 929                 else
 930                         cdev->userflags &= ~userflags;
 931                 mutex_unlock(&cdev->lock);
 932                 return 0;
 933         }
 934         case CAPI_GET_FLAGS:
 935                 if (copy_to_user(argp, &cdev->userflags,
 936                                  sizeof(cdev->userflags)))
 937                         return -EFAULT;
 938                 return 0;
 939
 940         case CAPI_NCCI_OPENCOUNT: {
 941                 struct capincci *nccip;
 942                 unsigned ncci;
 943                 int count = 0;
 944
 945                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 946                         return -EFAULT;
 947
 948                 mutex_lock(&cdev->lock);
 949                 nccip = capincci_find(cdev, (u32)ncci);
 950                 if (nccip)
 951                         count = capincci_minor_opencount(nccip);
 952                 mutex_unlock(&cdev->lock);
 953                 return count;
 954         }
 955
 956 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 957         case CAPI_NCCI_GETUNIT: {
 958                 struct capincci *nccip;
 959                 struct capiminor *mp;
 960                 unsigned ncci;
 961                 int unit = -ESRCH;
 962
 963                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 964                         return -EFAULT;
 965
 966                 mutex_lock(&cdev->lock);
 967                 nccip = capincci_find(cdev, (u32)ncci);
 968                 if (nccip) {
 969                         mp = nccip->minorp;
 970                         if (mp)
 971                                 unit = mp->minor;
 972                 }
 973                 mutex_unlock(&cdev->lock);
 974                 return unit;
 975         }
 976 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 977
 978         default:
 979                 return -EINVAL;
 980         }
 981 }
 982
 983 static long
 984 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 985 {
 986         int ret;
 987
 988         mutex_lock(&capi_mutex);
 989         ret = capi_ioctl(file, cmd, arg);
 990         mutex_unlock(&capi_mutex);
 991
 992         return ret;
 993 }
 994
 995 static int capi_open(struct inode *inode, struct file *file)
 996 {
 997         struct capidev *cdev;
 998
 999         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
1000         if (!cdev)
1001                 return -ENOMEM;
1002
1003         mutex_init(&cdev->lock);
1004         skb_queue_head_init(&cdev->recvqueue);
1005         init_waitqueue_head(&cdev->recvwait);
1006         INIT_LIST_HEAD(&cdev->nccis);
1007         file->private_data = cdev;
1008
1009         mutex_lock(&capidev_list_lock);
1010         list_add_tail(&cdev->list, &capidev_list);
1011         mutex_unlock(&capidev_list_lock);
1012
1013         return nonseekable_open(inode, file);
1014 }
1015
1016 static int capi_release(struct inode *inode, struct file *file)
1017 {
1018         struct capidev *cdev = file->private_data;
1019
1020         mutex_lock(&capidev_list_lock);
1021         list_del(&cdev->list);
1022         mutex_unlock(&capidev_list_lock);
1023
1024         if (cdev->ap.applid)
1025                 capi20_release(&cdev->ap);
1026         skb_queue_purge(&cdev->recvqueue);
1027         capincci_free(cdev, 0xffffffff);
1028
1029         kfree(cdev);
1030         return 0;
1031 }
1032
1033 static const struct file_operations capi_fops =
1034 {
1035         .owner          = THIS_MODULE,
1036         .llseek         = no_llseek,
1037         .read           = capi_read,
1038         .write          = capi_write,
1039         .poll           = capi_poll,
1040         .unlocked_ioctl = capi_unlocked_ioctl,
1041         .open           = capi_open,
1042         .release        = capi_release,
1043 };
1044
1045 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1046 /* -------- tty_operations for capincci ----------------------------- */
1047
1048 static int
1049 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1050 {
1051         int idx = tty->index;
1052         struct capiminor *mp = capiminor_get(idx);
1053         int ret = tty_init_termios(tty);
1054
1055         if (ret == 0) {
1056                 tty_driver_kref_get(driver);
1057                 tty->count++;
1058                 tty->driver_data = mp;
1059                 driver->ttys[idx] = tty;
1060         } else
1061                 capiminor_put(mp);
1062         return ret;
1063 }
1064
1065 static void capinc_tty_cleanup(struct tty_struct *tty)
1066 {
1067         struct capiminor *mp = tty->driver_data;
1068         tty->driver_data = NULL;
1069         capiminor_put(mp);
1070 }
1071
1072 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1073 {
1074         struct capiminor *mp = tty->driver_data;
1075         int err;
1076
1077         err = tty_port_open(&mp->port, tty, filp);
1078         if (err)
1079                 return err;
1080
1081         handle_minor_recv(mp);
1082         return 0;
1083 }
1084
1085 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1086 {
1087         struct capiminor *mp = tty->driver_data;
1088
1089         tty_port_close(&mp->port, tty, filp);
1090 }
1091
1092 static int capinc_tty_write(struct tty_struct *tty,
1093                             const unsigned char *buf, int count)
1094 {
1095         struct capiminor *mp = tty->driver_data;
1096         struct sk_buff *skb;
1097
1098 #ifdef _DEBUG_TTYFUNCS
1099         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1100 #endif
1101
1102         spin_lock_bh(&mp->outlock);
1103         skb = mp->outskb;
1104         if (skb) {
1105                 mp->outskb = NULL;
1106                 __skb_queue_tail(&mp->outqueue, skb);
1107                 mp->outbytes += skb->len;
1108         }
1109
1110         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1111         if (!skb) {
1112                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1113                 spin_unlock_bh(&mp->outlock);
1114                 return -ENOMEM;
1115         }
1116
1117         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1118         memcpy(skb_put(skb, count), buf, count);
1119
1120         __skb_queue_tail(&mp->outqueue, skb);
1121         mp->outbytes += skb->len;
1122         spin_unlock_bh(&mp->outlock);
1123
1124         handle_minor_send(mp);
1125
1126         return count;
1127 }
1128
1129 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1130 {
1131         struct capiminor *mp = tty->driver_data;
1132         bool invoke_send = false;
1133         struct sk_buff *skb;
1134         int ret = 1;
1135
1136 #ifdef _DEBUG_TTYFUNCS
1137         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1138 #endif
1139
1140         spin_lock_bh(&mp->outlock);
1141         skb = mp->outskb;
1142         if (skb) {
1143                 if (skb_tailroom(skb) > 0) {
1144                         *(skb_put(skb, 1)) = ch;
1145                         goto unlock_out;
1146                 }
1147                 mp->outskb = NULL;
1148                 __skb_queue_tail(&mp->outqueue, skb);
1149                 mp->outbytes += skb->len;
1150                 invoke_send = true;
1151         }
1152
1153         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1154         if (skb) {
1155                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1156                 *(skb_put(skb, 1)) = ch;
1157                 mp->outskb = skb;
1158         } else {
1159                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1160                 ret = 0;
1161         }
1162
1163 unlock_out:
1164         spin_unlock_bh(&mp->outlock);
1165
1166         if (invoke_send)
1167                 handle_minor_send(mp);
1168
1169         return ret;
1170 }
1171
1172 static void capinc_tty_flush_chars(struct tty_struct *tty)
1173 {
1174         struct capiminor *mp = tty->driver_data;
1175         struct sk_buff *skb;
1176
1177 #ifdef _DEBUG_TTYFUNCS
1178         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1179 #endif
1180
1181         spin_lock_bh(&mp->outlock);
1182         skb = mp->outskb;
1183         if (skb) {
1184                 mp->outskb = NULL;
1185                 __skb_queue_tail(&mp->outqueue, skb);
1186                 mp->outbytes += skb->len;
1187                 spin_unlock_bh(&mp->outlock);
1188
1189                 handle_minor_send(mp);
1190         } else
1191                 spin_unlock_bh(&mp->outlock);
1192
1193         handle_minor_recv(mp);
1194 }
1195
1196 static int capinc_tty_write_room(struct tty_struct *tty)
1197 {
1198         struct capiminor *mp = tty->driver_data;
1199         int room;
1200
1201         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1202         room *= CAPI_MAX_BLKSIZE;
1203 #ifdef _DEBUG_TTYFUNCS
1204         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1205 #endif
1206         return room;
1207 }
1208
1209 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1210 {
1211         struct capiminor *mp = tty->driver_data;
1212
1213 #ifdef _DEBUG_TTYFUNCS
1214         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1215                         mp->outbytes, mp->nack,
1216                         skb_queue_len(&mp->outqueue),
1217                         skb_queue_len(&mp->inqueue));
1218 #endif
1219         return mp->outbytes;
1220 }
1221
1222 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1223                     unsigned int cmd, unsigned long arg)
1224 {
1225         int error = 0;
1226         switch (cmd) {
1227         default:
1228                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1229                 break;
1230         }
1231         return error;
1232 }
1233
1234 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1235 {
1236 #ifdef _DEBUG_TTYFUNCS
1237         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1238 #endif
1239 }
1240
1241 static void capinc_tty_throttle(struct tty_struct *tty)
1242 {
1243         struct capiminor *mp = tty->driver_data;
1244 #ifdef _DEBUG_TTYFUNCS
1245         printk(KERN_DEBUG "capinc_tty_throttle\n");
1246 #endif
1247         mp->ttyinstop = 1;
1248 }
1249
1250 static void capinc_tty_unthrottle(struct tty_struct *tty)
1251 {
1252         struct capiminor *mp = tty->driver_data;
1253
1254 #ifdef _DEBUG_TTYFUNCS
1255         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1256 #endif
1257         mp->ttyinstop = 0;
1258         handle_minor_recv(mp);
1259 }
1260
1261 static void capinc_tty_stop(struct tty_struct *tty)
1262 {
1263         struct capiminor *mp = tty->driver_data;
1264
1265 #ifdef _DEBUG_TTYFUNCS
1266         printk(KERN_DEBUG "capinc_tty_stop\n");
1267 #endif
1268         mp->ttyoutstop = 1;
1269 }
1270
1271 static void capinc_tty_start(struct tty_struct *tty)
1272 {
1273         struct capiminor *mp = tty->driver_data;
1274
1275 #ifdef _DEBUG_TTYFUNCS
1276         printk(KERN_DEBUG "capinc_tty_start\n");
1277 #endif
1278         mp->ttyoutstop = 0;
1279         handle_minor_send(mp);
1280 }
1281
1282 static void capinc_tty_hangup(struct tty_struct *tty)
1283 {
1284         struct capiminor *mp = tty->driver_data;
1285
1286 #ifdef _DEBUG_TTYFUNCS
1287         printk(KERN_DEBUG "capinc_tty_hangup\n");
1288 #endif
1289         tty_port_hangup(&mp->port);
1290 }
1291
1292 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1293 {
1294 #ifdef _DEBUG_TTYFUNCS
1295         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1296 #endif
1297         return 0;
1298 }
1299
1300 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1301 {
1302 #ifdef _DEBUG_TTYFUNCS
1303         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1304 #endif
1305 }
1306
1307 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1308 {
1309 #ifdef _DEBUG_TTYFUNCS
1310         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1311 #endif
1312 }
1313
1314 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1315 {
1316 #ifdef _DEBUG_TTYFUNCS
1317         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1318 #endif
1319 }
1320
1321 static const struct tty_operations capinc_ops = {
1322         .open = capinc_tty_open,
1323         .close = capinc_tty_close,
1324         .write = capinc_tty_write,
1325         .put_char = capinc_tty_put_char,
1326         .flush_chars = capinc_tty_flush_chars,
1327         .write_room = capinc_tty_write_room,
1328         .chars_in_buffer = capinc_tty_chars_in_buffer,
1329         .ioctl = capinc_tty_ioctl,
1330         .set_termios = capinc_tty_set_termios,
1331         .throttle = capinc_tty_throttle,
1332         .unthrottle = capinc_tty_unthrottle,
1333         .stop = capinc_tty_stop,
1334         .start = capinc_tty_start,
1335         .hangup = capinc_tty_hangup,
1336         .break_ctl = capinc_tty_break_ctl,
1337         .flush_buffer = capinc_tty_flush_buffer,
1338         .set_ldisc = capinc_tty_set_ldisc,
1339         .send_xchar = capinc_tty_send_xchar,
1340         .install = capinc_tty_install,
1341         .cleanup = capinc_tty_cleanup,
1342 };
1343
1344 static int __init capinc_tty_init(void)
1345 {
1346         struct tty_driver *drv;
1347         int err;
1348
1349         if (capi_ttyminors > CAPINC_MAX_PORTS)
1350                 capi_ttyminors = CAPINC_MAX_PORTS;
1351         if (capi_ttyminors <= 0)
1352                 capi_ttyminors = CAPINC_NR_PORTS;
1353
1354         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1355                              GFP_KERNEL);
1356         if (!capiminors)
1357                 return -ENOMEM;
1358
1359         drv = alloc_tty_driver(capi_ttyminors);
1360         if (!drv) {
1361                 kfree(capiminors);
1362                 return -ENOMEM;
1363         }
1364         drv->owner = THIS_MODULE;
1365         drv->driver_name = "capi_nc";
1366         drv->name = "capi";
1367         drv->major = 0;
1368         drv->minor_start = 0;
1369         drv->type = TTY_DRIVER_TYPE_SERIAL;
1370         drv->subtype = SERIAL_TYPE_NORMAL;
1371         drv->init_termios = tty_std_termios;
1372         drv->init_termios.c_iflag = ICRNL;
1373         drv->init_termios.c_oflag = OPOST | ONLCR;
1374         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1375         drv->init_termios.c_lflag = 0;
1376         drv->flags =
1377                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1378                 TTY_DRIVER_DYNAMIC_DEV;
1379         tty_set_operations(drv, &capinc_ops);
1380
1381         err = tty_register_driver(drv);
1382         if (err) {
1383                 put_tty_driver(drv);
1384                 kfree(capiminors);
1385                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1386                 return err;
1387         }
1388         capinc_tty_driver = drv;
1389         return 0;
1390 }
1391
1392 static void __exit capinc_tty_exit(void)
1393 {
1394         tty_unregister_driver(capinc_tty_driver);
1395         put_tty_driver(capinc_tty_driver);
1396         kfree(capiminors);
1397 }
1398
1399 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1400
1401 static inline int capinc_tty_init(void)
1402 {
1403         return 0;
1404 }
1405
1406 static inline void capinc_tty_exit(void) { }
1407
1408 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1409
1410 /* -------- /proc functions ----------------------------------------- */
1411
1412 /*
1413  * /proc/capi/capi20:
1414  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1415  */
1416 static int capi20_proc_show(struct seq_file *m, void *v)
1417 {
1418         struct capidev *cdev;
1419         struct list_head *l;
1420
1421         mutex_lock(&capidev_list_lock);
1422         list_for_each(l, &capidev_list) {
1423                 cdev = list_entry(l, struct capidev, list);
1424                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1425                         cdev->ap.applid,
1426                         cdev->ap.nrecvctlpkt,
1427                         cdev->ap.nrecvdatapkt,
1428                         cdev->ap.nsentctlpkt,
1429                         cdev->ap.nsentdatapkt);
1430         }
1431         mutex_unlock(&capidev_list_lock);
1432         return 0;
1433 }
1434
1435 static int capi20_proc_open(struct inode *inode, struct file *file)
1436 {
1437         return single_open(file, capi20_proc_show, NULL);
1438 }
1439
1440 static const struct file_operations capi20_proc_fops = {
1441         .owner          = THIS_MODULE,
1442         .open           = capi20_proc_open,
1443         .read           = seq_read,
1444         .llseek         = seq_lseek,
1445         .release        = single_release,
1446 };
1447
1448 /*
1449  * /proc/capi/capi20ncci:
1450  *  applid ncci
1451  */
1452 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1453 {
1454         struct capidev *cdev;
1455         struct capincci *np;
1456
1457         mutex_lock(&capidev_list_lock);
1458         list_for_each_entry(cdev, &capidev_list, list) {
1459                 mutex_lock(&cdev->lock);
1460                 list_for_each_entry(np, &cdev->nccis, list)
1461                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1462                 mutex_unlock(&cdev->lock);
1463         }
1464         mutex_unlock(&capidev_list_lock);
1465         return 0;
1466 }
1467
1468 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1469 {
1470         return single_open(file, capi20ncci_proc_show, NULL);
1471 }
1472
1473 static const struct file_operations capi20ncci_proc_fops = {
1474         .owner          = THIS_MODULE,
1475         .open           = capi20ncci_proc_open,
1476         .read           = seq_read,
1477         .llseek         = seq_lseek,
1478         .release        = single_release,
1479 };
1480
1481 static void __init proc_init(void)
1482 {
1483         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1484         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1485 }
1486
1487 static void __exit proc_exit(void)
1488 {
1489         remove_proc_entry("capi/capi20", NULL);
1490         remove_proc_entry("capi/capi20ncci", NULL);
1491 }
1492
1493 /* -------- init function and module interface ---------------------- */
1494
1495
1496 static int __init capi_init(void)
1497 {
1498         const char *compileinfo;
1499         int major_ret;
1500
1501         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1502         if (major_ret < 0) {
1503                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1504                 return major_ret;
1505         }
1506         capi_class = class_create(THIS_MODULE, "capi");
1507         if (IS_ERR(capi_class)) {
1508                 unregister_chrdev(capi_major, "capi20");
1509                 return PTR_ERR(capi_class);
1510         }
1511
1512         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1513
1514         if (capinc_tty_init() < 0) {
1515                 device_destroy(capi_class, MKDEV(capi_major, 0));
1516                 class_destroy(capi_class);
1517                 unregister_chrdev(capi_major, "capi20");
1518                 return -ENOMEM;
1519         }
1520
1521         proc_init();
1522
1523 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1524         compileinfo = " (middleware+capifs)";
1525 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1526         compileinfo = " (no capifs)";
1527 #else
1528         compileinfo = " (no middleware)";
1529 #endif
1530         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1531                capi_major, compileinfo);
1532
1533         return 0;
1534 }
1535
1536 static void __exit capi_exit(void)
1537 {
1538         proc_exit();
1539
1540         device_destroy(capi_class, MKDEV(capi_major, 0));
1541         class_destroy(capi_class);
1542         unregister_chrdev(capi_major, "capi20");
1543
1544         capinc_tty_exit();
1545 }
1546
1547 module_init(capi_init);
1548 module_exit(capi_exit);