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/compiler.h>
  13 #include <linux/module.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/major.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/fcntl.h>
  20 #include <linux/fs.h>
  21 #include <linux/signal.h>
  22 #include <linux/mutex.h>
  23 #include <linux/mm.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/ppp-ioctl.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 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  43 MODULE_AUTHOR("Carsten Paeth");
  44 MODULE_LICENSE("GPL");
  45
  46 /* -------- driver information -------------------------------------- */
  47
  48 static DEFINE_MUTEX(capi_mutex);
  49 static struct class *capi_class;
  50 static int capi_major = 68;             /* allocated */
  51
  52 module_param_named(major, capi_major, uint, 0);
  53
  54 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  55 #define CAPINC_NR_PORTS         32
  56 #define CAPINC_MAX_PORTS        256
  57
  58 static int capi_ttyminors = CAPINC_NR_PORTS;
  59
  60 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  61 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  62
  63 /* -------- defines ------------------------------------------------- */
  64
  65 #define CAPINC_MAX_RECVQUEUE    10
  66 #define CAPINC_MAX_SENDQUEUE    10
  67 #define CAPI_MAX_BLKSIZE        2048
  68
  69 /* -------- data structures ----------------------------------------- */
  70
  71 struct capidev;
  72 struct capincci;
  73 struct capiminor;
  74
  75 struct ackqueue_entry {
  76         struct list_head        list;
  77         u16                     datahandle;
  78 };
  79
  80 struct capiminor {
  81         unsigned int      minor;
  82
  83         struct capi20_appl      *ap;
  84         u32                     ncci;
  85         atomic_t                datahandle;
  86         atomic_t                msgid;
  87
  88         struct tty_port port;
  89         int                ttyinstop;
  90         int                ttyoutstop;
  91
  92         struct sk_buff_head     inqueue;
  93
  94         struct sk_buff_head     outqueue;
  95         int                     outbytes;
  96         struct sk_buff          *outskb;
  97         spinlock_t              outlock;
  98
  99         /* transmit path */
 100         struct list_head ackqueue;
 101         int nack;
 102         spinlock_t ackqlock;
 103 };
 104
 105 struct capincci {
 106         struct list_head list;
 107         u32              ncci;
 108         struct capidev  *cdev;
 109 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 110         struct capiminor *minorp;
 111 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 112 };
 113
 114 struct capidev {
 115         struct list_head list;
 116         struct capi20_appl ap;
 117         u16             errcode;
 118         unsigned        userflags;
 119
 120         struct sk_buff_head recvqueue;
 121         wait_queue_head_t recvwait;
 122
 123         struct list_head nccis;
 124
 125         struct mutex lock;
 126 };
 127
 128 /* -------- global variables ---------------------------------------- */
 129
 130 static DEFINE_MUTEX(capidev_list_lock);
 131 static LIST_HEAD(capidev_list);
 132
 133 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 134
 135 static DEFINE_SPINLOCK(capiminors_lock);
 136 static struct capiminor **capiminors;
 137
 138 static struct tty_driver *capinc_tty_driver;
 139
 140 /* -------- datahandles --------------------------------------------- */
 141
 142 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 143 {
 144         struct ackqueue_entry *n;
 145
 146         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 147         if (unlikely(!n)) {
 148                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 149                 return -1;
 150         }
 151         n->datahandle = datahandle;
 152         INIT_LIST_HEAD(&n->list);
 153         spin_lock_bh(&mp->ackqlock);
 154         list_add_tail(&n->list, &mp->ackqueue);
 155         mp->nack++;
 156         spin_unlock_bh(&mp->ackqlock);
 157         return 0;
 158 }
 159
 160 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 161 {
 162         struct ackqueue_entry *p, *tmp;
 163
 164         spin_lock_bh(&mp->ackqlock);
 165         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 166                 if (p->datahandle == datahandle) {
 167                         list_del(&p->list);
 168                         mp->nack--;
 169                         spin_unlock_bh(&mp->ackqlock);
 170                         kfree(p);
 171                         return 0;
 172                 }
 173         }
 174         spin_unlock_bh(&mp->ackqlock);
 175         return -1;
 176 }
 177
 178 static void capiminor_del_all_ack(struct capiminor *mp)
 179 {
 180         struct ackqueue_entry *p, *tmp;
 181
 182         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 183                 list_del(&p->list);
 184                 kfree(p);
 185                 mp->nack--;
 186         }
 187 }
 188
 189
 190 /* -------- struct capiminor ---------------------------------------- */
 191
 192 static void capiminor_destroy(struct tty_port *port)
 193 {
 194         struct capiminor *mp = container_of(port, struct capiminor, port);
 195
 196         kfree_skb(mp->outskb);
 197         skb_queue_purge(&mp->inqueue);
 198         skb_queue_purge(&mp->outqueue);
 199         capiminor_del_all_ack(mp);
 200         kfree(mp);
 201 }
 202
 203 static const struct tty_port_operations capiminor_port_ops = {
 204         .destruct = capiminor_destroy,
 205 };
 206
 207 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 208 {
 209         struct capiminor *mp;
 210         struct device *dev;
 211         unsigned int minor;
 212
 213         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 214         if (!mp) {
 215                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 216                 return NULL;
 217         }
 218
 219         mp->ap = ap;
 220         mp->ncci = ncci;
 221         INIT_LIST_HEAD(&mp->ackqueue);
 222         spin_lock_init(&mp->ackqlock);
 223
 224         skb_queue_head_init(&mp->inqueue);
 225         skb_queue_head_init(&mp->outqueue);
 226         spin_lock_init(&mp->outlock);
 227
 228         tty_port_init(&mp->port);
 229         mp->port.ops = &capiminor_port_ops;
 230
 231         /* Allocate the least unused minor number. */
 232         spin_lock(&capiminors_lock);
 233         for (minor = 0; minor < capi_ttyminors; minor++)
 234                 if (!capiminors[minor]) {
 235                         capiminors[minor] = mp;
 236                         break;
 237                 }
 238         spin_unlock(&capiminors_lock);
 239
 240         if (minor == capi_ttyminors) {
 241                 printk(KERN_NOTICE "capi: out of minors\n");
 242                 goto err_out1;
 243         }
 244
 245         mp->minor = minor;
 246
 247         dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
 248                         NULL);
 249         if (IS_ERR(dev))
 250                 goto err_out2;
 251
 252         return mp;
 253
 254 err_out2:
 255         spin_lock(&capiminors_lock);
 256         capiminors[minor] = NULL;
 257         spin_unlock(&capiminors_lock);
 258
 259 err_out1:
 260         tty_port_put(&mp->port);
 261         return NULL;
 262 }
 263
 264 static struct capiminor *capiminor_get(unsigned int minor)
 265 {
 266         struct capiminor *mp;
 267
 268         spin_lock(&capiminors_lock);
 269         mp = capiminors[minor];
 270         if (mp)
 271                 tty_port_get(&mp->port);
 272         spin_unlock(&capiminors_lock);
 273
 274         return mp;
 275 }
 276
 277 static inline void capiminor_put(struct capiminor *mp)
 278 {
 279         tty_port_put(&mp->port);
 280 }
 281
 282 static void capiminor_free(struct capiminor *mp)
 283 {
 284         tty_unregister_device(capinc_tty_driver, mp->minor);
 285
 286         spin_lock(&capiminors_lock);
 287         capiminors[mp->minor] = NULL;
 288         spin_unlock(&capiminors_lock);
 289
 290         capiminor_put(mp);
 291 }
 292
 293 /* -------- struct capincci ----------------------------------------- */
 294
 295 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 296 {
 297         if (cdev->userflags & CAPIFLAG_HIGHJACKING)
 298                 np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 299 }
 300
 301 static void capincci_free_minor(struct capincci *np)
 302 {
 303         struct capiminor *mp = np->minorp;
 304         struct tty_struct *tty;
 305
 306         if (mp) {
 307                 tty = tty_port_tty_get(&mp->port);
 308                 if (tty) {
 309                         tty_vhangup(tty);
 310                         tty_kref_put(tty);
 311                 }
 312
 313                 capiminor_free(mp);
 314         }
 315 }
 316
 317 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 318 {
 319         struct capiminor *mp = np->minorp;
 320         unsigned int count = 0;
 321         struct tty_struct *tty;
 322
 323         if (mp) {
 324                 tty = tty_port_tty_get(&mp->port);
 325                 if (tty) {
 326                         count = tty->count;
 327                         tty_kref_put(tty);
 328                 }
 329         }
 330         return count;
 331 }
 332
 333 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 334
 335 static inline void
 336 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 337 static inline void capincci_free_minor(struct capincci *np) { }
 338
 339 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 340
 341 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 342 {
 343         struct capincci *np;
 344
 345         np = kzalloc(sizeof(*np), GFP_KERNEL);
 346         if (!np)
 347                 return NULL;
 348         np->ncci = ncci;
 349         np->cdev = cdev;
 350
 351         capincci_alloc_minor(cdev, np);
 352
 353         list_add_tail(&np->list, &cdev->nccis);
 354
 355         return np;
 356 }
 357
 358 static void capincci_free(struct capidev *cdev, u32 ncci)
 359 {
 360         struct capincci *np, *tmp;
 361
 362         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 363                 if (ncci == 0xffffffff || np->ncci == ncci) {
 364                         capincci_free_minor(np);
 365                         list_del(&np->list);
 366                         kfree(np);
 367                 }
 368 }
 369
 370 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 371 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 372 {
 373         struct capincci *np;
 374
 375         list_for_each_entry(np, &cdev->nccis, list)
 376                 if (np->ncci == ncci)
 377                         return np;
 378         return NULL;
 379 }
 380
 381 /* -------- handle data queue --------------------------------------- */
 382
 383 static struct sk_buff *
 384 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 385 {
 386         struct sk_buff *nskb;
 387         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
 388         if (nskb) {
 389                 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 390                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 391                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 392                 capimsg_setu16(s, 2, mp->ap->applid);
 393                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 394                 capimsg_setu8 (s, 5, CAPI_RESP);
 395                 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
 396                 capimsg_setu32(s, 8, mp->ncci);
 397                 capimsg_setu16(s, 12, datahandle);
 398         }
 399         return nskb;
 400 }
 401
 402 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 403 {
 404         unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
 405         struct tty_struct *tty;
 406         struct sk_buff *nskb;
 407         u16 errcode, datahandle;
 408         struct tty_ldisc *ld;
 409         int ret = -1;
 410
 411         tty = tty_port_tty_get(&mp->port);
 412         if (!tty) {
 413                 pr_debug("capi: currently no receiver\n");
 414                 return -1;
 415         }
 416
 417         ld = tty_ldisc_ref(tty);
 418         if (!ld) {
 419                 /* fatal error, do not requeue */
 420                 ret = 0;
 421                 kfree_skb(skb);
 422                 goto deref_tty;
 423         }
 424
 425         if (ld->ops->receive_buf == NULL) {
 426                 pr_debug("capi: ldisc has no receive_buf function\n");
 427                 /* fatal error, do not requeue */
 428                 goto free_skb;
 429         }
 430         if (mp->ttyinstop) {
 431                 pr_debug("capi: recv tty throttled\n");
 432                 goto deref_ldisc;
 433         }
 434
 435         if (tty->receive_room < datalen) {
 436                 pr_debug("capi: no room in tty\n");
 437                 goto deref_ldisc;
 438         }
 439
 440         nskb = gen_data_b3_resp_for(mp, skb);
 441         if (!nskb) {
 442                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 443                 goto deref_ldisc;
 444         }
 445
 446         datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 447
 448         errcode = capi20_put_message(mp->ap, nskb);
 449
 450         if (errcode == CAPI_NOERROR) {
 451                 skb_pull(skb, CAPIMSG_LEN(skb->data));
 452                 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
 453                          datahandle, skb->len);
 454                 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 455         } else {
 456                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 457                        errcode);
 458                 kfree_skb(nskb);
 459
 460                 if (errcode == CAPI_SENDQUEUEFULL)
 461                         goto deref_ldisc;
 462         }
 463
 464 free_skb:
 465         ret = 0;
 466         kfree_skb(skb);
 467
 468 deref_ldisc:
 469         tty_ldisc_deref(ld);
 470
 471 deref_tty:
 472         tty_kref_put(tty);
 473         return ret;
 474 }
 475
 476 static void handle_minor_recv(struct capiminor *mp)
 477 {
 478         struct sk_buff *skb;
 479
 480         while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
 481                 if (handle_recv_skb(mp, skb) < 0) {
 482                         skb_queue_head(&mp->inqueue, skb);
 483                         return;
 484                 }
 485 }
 486
 487 static void handle_minor_send(struct capiminor *mp)
 488 {
 489         struct tty_struct *tty;
 490         struct sk_buff *skb;
 491         u16 len;
 492         u16 errcode;
 493         u16 datahandle;
 494
 495         tty = tty_port_tty_get(&mp->port);
 496         if (!tty)
 497                 return;
 498
 499         if (mp->ttyoutstop) {
 500                 pr_debug("capi: send: tty stopped\n");
 501                 tty_kref_put(tty);
 502                 return;
 503         }
 504
 505         while (1) {
 506                 spin_lock_bh(&mp->outlock);
 507                 skb = __skb_dequeue(&mp->outqueue);
 508                 if (!skb) {
 509                         spin_unlock_bh(&mp->outlock);
 510                         break;
 511                 }
 512                 len = (u16)skb->len;
 513                 mp->outbytes -= len;
 514                 spin_unlock_bh(&mp->outlock);
 515
 516                 datahandle = atomic_inc_return(&mp->datahandle);
 517                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 518                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 519                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 520                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 521                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 522                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 523                 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
 524                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 525                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 526                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 527                 capimsg_setu16(skb->data, 18, datahandle);
 528                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 529
 530                 if (capiminor_add_ack(mp, datahandle) < 0) {
 531                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 532
 533                         spin_lock_bh(&mp->outlock);
 534                         __skb_queue_head(&mp->outqueue, skb);
 535                         mp->outbytes += len;
 536                         spin_unlock_bh(&mp->outlock);
 537
 538                         break;
 539                 }
 540                 errcode = capi20_put_message(mp->ap, skb);
 541                 if (errcode == CAPI_NOERROR) {
 542                         pr_debug("capi: DATA_B3_REQ %u len=%u\n",
 543                                  datahandle, len);
 544                         continue;
 545                 }
 546                 capiminor_del_ack(mp, datahandle);
 547
 548                 if (errcode == CAPI_SENDQUEUEFULL) {
 549                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 550
 551                         spin_lock_bh(&mp->outlock);
 552                         __skb_queue_head(&mp->outqueue, skb);
 553                         mp->outbytes += len;
 554                         spin_unlock_bh(&mp->outlock);
 555
 556                         break;
 557                 }
 558
 559                 /* ups, drop packet */
 560                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 561                 kfree_skb(skb);
 562         }
 563         tty_kref_put(tty);
 564 }
 565
 566 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 567 /* -------- function called by lower level -------------------------- */
 568
 569 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 570 {
 571         struct capidev *cdev = ap->private;
 572 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 573         struct capiminor *mp;
 574         u16 datahandle;
 575         struct capincci *np;
 576 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 577
 578         mutex_lock(&cdev->lock);
 579
 580         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 581                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 582                 if ((info & 0xff00) == 0)
 583                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 584         }
 585         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 586                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 587
 588         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 589                 skb_queue_tail(&cdev->recvqueue, skb);
 590                 wake_up_interruptible(&cdev->recvwait);
 591                 goto unlock_out;
 592         }
 593
 594 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 595         skb_queue_tail(&cdev->recvqueue, skb);
 596         wake_up_interruptible(&cdev->recvwait);
 597
 598 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 599
 600         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 601         if (!np) {
 602                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 603                 skb_queue_tail(&cdev->recvqueue, skb);
 604                 wake_up_interruptible(&cdev->recvwait);
 605                 goto unlock_out;
 606         }
 607
 608         mp = np->minorp;
 609         if (!mp) {
 610                 skb_queue_tail(&cdev->recvqueue, skb);
 611                 wake_up_interruptible(&cdev->recvwait);
 612                 goto unlock_out;
 613         }
 614         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 615                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 616                 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
 617                          datahandle, skb->len-CAPIMSG_LEN(skb->data));
 618                 skb_queue_tail(&mp->inqueue, skb);
 619
 620                 handle_minor_recv(mp);
 621
 622         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 623
 624                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 625                 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
 626                          datahandle,
 627                          CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
 628                 kfree_skb(skb);
 629                 capiminor_del_ack(mp, datahandle);
 630                 tty_port_tty_wakeup(&mp->port);
 631                 handle_minor_send(mp);
 632
 633         } else {
 634                 /* ups, let capi application handle it :-) */
 635                 skb_queue_tail(&cdev->recvqueue, skb);
 636                 wake_up_interruptible(&cdev->recvwait);
 637         }
 638 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 639
 640 unlock_out:
 641         mutex_unlock(&cdev->lock);
 642 }
 643
 644 /* -------- file_operations for capidev ----------------------------- */
 645
 646 static ssize_t
 647 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 648 {
 649         struct capidev *cdev = file->private_data;
 650         struct sk_buff *skb;
 651         size_t copied;
 652         int err;
 653
 654         if (!cdev->ap.applid)
 655                 return -ENODEV;
 656
 657         skb = skb_dequeue(&cdev->recvqueue);
 658         if (!skb) {
 659                 if (file->f_flags & O_NONBLOCK)
 660                         return -EAGAIN;
 661                 err = wait_event_interruptible(cdev->recvwait,
 662                                                (skb = skb_dequeue(&cdev->recvqueue)));
 663                 if (err)
 664                         return err;
 665         }
 666         if (skb->len > count) {
 667                 skb_queue_head(&cdev->recvqueue, skb);
 668                 return -EMSGSIZE;
 669         }
 670         if (copy_to_user(buf, skb->data, skb->len)) {
 671                 skb_queue_head(&cdev->recvqueue, skb);
 672                 return -EFAULT;
 673         }
 674         copied = skb->len;
 675
 676         kfree_skb(skb);
 677
 678         return copied;
 679 }
 680
 681 static ssize_t
 682 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 683 {
 684         struct capidev *cdev = file->private_data;
 685         struct sk_buff *skb;
 686         u16 mlen;
 687
 688         if (!cdev->ap.applid)
 689                 return -ENODEV;
 690
 691         skb = alloc_skb(count, GFP_USER);
 692         if (!skb)
 693                 return -ENOMEM;
 694
 695         if (copy_from_user(skb_put(skb, count), buf, count)) {
 696                 kfree_skb(skb);
 697                 return -EFAULT;
 698         }
 699         mlen = CAPIMSG_LEN(skb->data);
 700         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 701                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 702                         kfree_skb(skb);
 703                         return -EINVAL;
 704                 }
 705         } else {
 706                 if (mlen != count) {
 707                         kfree_skb(skb);
 708                         return -EINVAL;
 709                 }
 710         }
 711         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 712
 713         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 714                 mutex_lock(&cdev->lock);
 715                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 716                 mutex_unlock(&cdev->lock);
 717         }
 718
 719         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 720
 721         if (cdev->errcode) {
 722                 kfree_skb(skb);
 723                 return -EIO;
 724         }
 725         return count;
 726 }
 727
 728 static __poll_t
 729 capi_poll(struct file *file, poll_table *wait)
 730 {
 731         struct capidev *cdev = file->private_data;
 732         __poll_t mask = 0;
 733
 734         if (!cdev->ap.applid)
 735                 return EPOLLERR;
 736
 737         poll_wait(file, &(cdev->recvwait), wait);
 738         mask = EPOLLOUT | EPOLLWRNORM;
 739         if (!skb_queue_empty(&cdev->recvqueue))
 740                 mask |= EPOLLIN | EPOLLRDNORM;
 741         return mask;
 742 }
 743
 744 static int
 745 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 746 {
 747         struct capidev *cdev = file->private_data;
 748         capi_ioctl_struct data;
 749         int retval = -EINVAL;
 750         void __user *argp = (void __user *)arg;
 751
 752         switch (cmd) {
 753         case CAPI_REGISTER:
 754                 mutex_lock(&cdev->lock);
 755
 756                 if (cdev->ap.applid) {
 757                         retval = -EEXIST;
 758                         goto register_out;
 759                 }
 760                 if (copy_from_user(&cdev->ap.rparam, argp,
 761                                    sizeof(struct capi_register_params))) {
 762                         retval = -EFAULT;
 763                         goto register_out;
 764                 }
 765                 cdev->ap.private = cdev;
 766                 cdev->ap.recv_message = capi_recv_message;
 767                 cdev->errcode = capi20_register(&cdev->ap);
 768                 retval = (int)cdev->ap.applid;
 769                 if (cdev->errcode) {
 770                         cdev->ap.applid = 0;
 771                         retval = -EIO;
 772                 }
 773
 774 register_out:
 775                 mutex_unlock(&cdev->lock);
 776                 return retval;
 777
 778         case CAPI_GET_VERSION:
 779                 if (copy_from_user(&data.contr, argp,
 780                                    sizeof(data.contr)))
 781                         return -EFAULT;
 782                 cdev->errcode = capi20_get_version(data.contr, &data.version);
 783                 if (cdev->errcode)
 784                         return -EIO;
 785                 if (copy_to_user(argp, &data.version,
 786                                  sizeof(data.version)))
 787                         return -EFAULT;
 788                 return 0;
 789
 790         case CAPI_GET_SERIAL:
 791                 if (copy_from_user(&data.contr, argp,
 792                                    sizeof(data.contr)))
 793                         return -EFAULT;
 794                 cdev->errcode = capi20_get_serial(data.contr, data.serial);
 795                 if (cdev->errcode)
 796                         return -EIO;
 797                 if (copy_to_user(argp, data.serial,
 798                                  sizeof(data.serial)))
 799                         return -EFAULT;
 800                 return 0;
 801
 802         case CAPI_GET_PROFILE:
 803                 if (copy_from_user(&data.contr, argp,
 804                                    sizeof(data.contr)))
 805                         return -EFAULT;
 806
 807                 if (data.contr == 0) {
 808                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 809                         if (cdev->errcode)
 810                                 return -EIO;
 811
 812                         retval = copy_to_user(argp,
 813                                               &data.profile.ncontroller,
 814                                               sizeof(data.profile.ncontroller));
 815
 816                 } else {
 817                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 818                         if (cdev->errcode)
 819                                 return -EIO;
 820
 821                         retval = copy_to_user(argp, &data.profile,
 822                                               sizeof(data.profile));
 823                 }
 824                 if (retval)
 825                         return -EFAULT;
 826                 return 0;
 827
 828         case CAPI_GET_MANUFACTURER:
 829                 if (copy_from_user(&data.contr, argp,
 830                                    sizeof(data.contr)))
 831                         return -EFAULT;
 832                 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 833                 if (cdev->errcode)
 834                         return -EIO;
 835
 836                 if (copy_to_user(argp, data.manufacturer,
 837                                  sizeof(data.manufacturer)))
 838                         return -EFAULT;
 839
 840                 return 0;
 841
 842         case CAPI_GET_ERRCODE:
 843                 data.errcode = cdev->errcode;
 844                 cdev->errcode = CAPI_NOERROR;
 845                 if (arg) {
 846                         if (copy_to_user(argp, &data.errcode,
 847                                          sizeof(data.errcode)))
 848                                 return -EFAULT;
 849                 }
 850                 return data.errcode;
 851
 852         case CAPI_INSTALLED:
 853                 if (capi20_isinstalled() == CAPI_NOERROR)
 854                         return 0;
 855                 return -ENXIO;
 856
 857         case CAPI_MANUFACTURER_CMD: {
 858                 struct capi_manufacturer_cmd mcmd;
 859                 if (!capable(CAP_SYS_ADMIN))
 860                         return -EPERM;
 861                 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 862                         return -EFAULT;
 863                 return capi20_manufacturer(mcmd.cmd, mcmd.data);
 864         }
 865         case CAPI_SET_FLAGS:
 866         case CAPI_CLR_FLAGS: {
 867                 unsigned userflags;
 868
 869                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 870                         return -EFAULT;
 871
 872                 mutex_lock(&cdev->lock);
 873                 if (cmd == CAPI_SET_FLAGS)
 874                         cdev->userflags |= userflags;
 875                 else
 876                         cdev->userflags &= ~userflags;
 877                 mutex_unlock(&cdev->lock);
 878                 return 0;
 879         }
 880         case CAPI_GET_FLAGS:
 881                 if (copy_to_user(argp, &cdev->userflags,
 882                                  sizeof(cdev->userflags)))
 883                         return -EFAULT;
 884                 return 0;
 885
 886 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 887         case CAPI_NCCI_OPENCOUNT:
 888                 return 0;
 889
 890 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 891         case CAPI_NCCI_OPENCOUNT: {
 892                 struct capincci *nccip;
 893                 unsigned ncci;
 894                 int count = 0;
 895
 896                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 897                         return -EFAULT;
 898
 899                 mutex_lock(&cdev->lock);
 900                 nccip = capincci_find(cdev, (u32)ncci);
 901                 if (nccip)
 902                         count = capincci_minor_opencount(nccip);
 903                 mutex_unlock(&cdev->lock);
 904                 return count;
 905         }
 906
 907         case CAPI_NCCI_GETUNIT: {
 908                 struct capincci *nccip;
 909                 struct capiminor *mp;
 910                 unsigned ncci;
 911                 int unit = -ESRCH;
 912
 913                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 914                         return -EFAULT;
 915
 916                 mutex_lock(&cdev->lock);
 917                 nccip = capincci_find(cdev, (u32)ncci);
 918                 if (nccip) {
 919                         mp = nccip->minorp;
 920                         if (mp)
 921                                 unit = mp->minor;
 922                 }
 923                 mutex_unlock(&cdev->lock);
 924                 return unit;
 925         }
 926 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 927
 928         default:
 929                 return -EINVAL;
 930         }
 931 }
 932
 933 static long
 934 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 935 {
 936         int ret;
 937
 938         mutex_lock(&capi_mutex);
 939         ret = capi_ioctl(file, cmd, arg);
 940         mutex_unlock(&capi_mutex);
 941
 942         return ret;
 943 }
 944
 945 static int capi_open(struct inode *inode, struct file *file)
 946 {
 947         struct capidev *cdev;
 948
 949         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 950         if (!cdev)
 951                 return -ENOMEM;
 952
 953         mutex_init(&cdev->lock);
 954         skb_queue_head_init(&cdev->recvqueue);
 955         init_waitqueue_head(&cdev->recvwait);
 956         INIT_LIST_HEAD(&cdev->nccis);
 957         file->private_data = cdev;
 958
 959         mutex_lock(&capidev_list_lock);
 960         list_add_tail(&cdev->list, &capidev_list);
 961         mutex_unlock(&capidev_list_lock);
 962
 963         return stream_open(inode, file);
 964 }
 965
 966 static int capi_release(struct inode *inode, struct file *file)
 967 {
 968         struct capidev *cdev = file->private_data;
 969
 970         mutex_lock(&capidev_list_lock);
 971         list_del(&cdev->list);
 972         mutex_unlock(&capidev_list_lock);
 973
 974         if (cdev->ap.applid)
 975                 capi20_release(&cdev->ap);
 976         skb_queue_purge(&cdev->recvqueue);
 977         capincci_free(cdev, 0xffffffff);
 978
 979         kfree(cdev);
 980         return 0;
 981 }
 982
 983 static const struct file_operations capi_fops =
 984 {
 985         .owner          = THIS_MODULE,
 986         .llseek         = no_llseek,
 987         .read           = capi_read,
 988         .write          = capi_write,
 989         .poll           = capi_poll,
 990         .unlocked_ioctl = capi_unlocked_ioctl,
 991         .open           = capi_open,
 992         .release        = capi_release,
 993 };
 994
 995 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 996 /* -------- tty_operations for capincci ----------------------------- */
 997
 998 static int
 999 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1000 {
1001         struct capiminor *mp = capiminor_get(tty->index);
1002         int ret = tty_standard_install(driver, tty);
1003
1004         if (ret == 0)
1005                 tty->driver_data = mp;
1006         else
1007                 capiminor_put(mp);
1008         return ret;
1009 }
1010
1011 static void capinc_tty_cleanup(struct tty_struct *tty)
1012 {
1013         struct capiminor *mp = tty->driver_data;
1014         tty->driver_data = NULL;
1015         capiminor_put(mp);
1016 }
1017
1018 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1019 {
1020         struct capiminor *mp = tty->driver_data;
1021         int err;
1022
1023         err = tty_port_open(&mp->port, tty, filp);
1024         if (err)
1025                 return err;
1026
1027         handle_minor_recv(mp);
1028         return 0;
1029 }
1030
1031 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1032 {
1033         struct capiminor *mp = tty->driver_data;
1034
1035         tty_port_close(&mp->port, tty, filp);
1036 }
1037
1038 static int capinc_tty_write(struct tty_struct *tty,
1039                             const unsigned char *buf, int count)
1040 {
1041         struct capiminor *mp = tty->driver_data;
1042         struct sk_buff *skb;
1043
1044         pr_debug("capinc_tty_write(count=%d)\n", count);
1045
1046         spin_lock_bh(&mp->outlock);
1047         skb = mp->outskb;
1048         if (skb) {
1049                 mp->outskb = NULL;
1050                 __skb_queue_tail(&mp->outqueue, skb);
1051                 mp->outbytes += skb->len;
1052         }
1053
1054         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1055         if (!skb) {
1056                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1057                 spin_unlock_bh(&mp->outlock);
1058                 return -ENOMEM;
1059         }
1060
1061         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1062         skb_put_data(skb, buf, count);
1063
1064         __skb_queue_tail(&mp->outqueue, skb);
1065         mp->outbytes += skb->len;
1066         spin_unlock_bh(&mp->outlock);
1067
1068         handle_minor_send(mp);
1069
1070         return count;
1071 }
1072
1073 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1074 {
1075         struct capiminor *mp = tty->driver_data;
1076         bool invoke_send = false;
1077         struct sk_buff *skb;
1078         int ret = 1;
1079
1080         pr_debug("capinc_put_char(%u)\n", ch);
1081
1082         spin_lock_bh(&mp->outlock);
1083         skb = mp->outskb;
1084         if (skb) {
1085                 if (skb_tailroom(skb) > 0) {
1086                         skb_put_u8(skb, ch);
1087                         goto unlock_out;
1088                 }
1089                 mp->outskb = NULL;
1090                 __skb_queue_tail(&mp->outqueue, skb);
1091                 mp->outbytes += skb->len;
1092                 invoke_send = true;
1093         }
1094
1095         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1096         if (skb) {
1097                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1098                 skb_put_u8(skb, ch);
1099                 mp->outskb = skb;
1100         } else {
1101                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1102                 ret = 0;
1103         }
1104
1105 unlock_out:
1106         spin_unlock_bh(&mp->outlock);
1107
1108         if (invoke_send)
1109                 handle_minor_send(mp);
1110
1111         return ret;
1112 }
1113
1114 static void capinc_tty_flush_chars(struct tty_struct *tty)
1115 {
1116         struct capiminor *mp = tty->driver_data;
1117         struct sk_buff *skb;
1118
1119         pr_debug("capinc_tty_flush_chars\n");
1120
1121         spin_lock_bh(&mp->outlock);
1122         skb = mp->outskb;
1123         if (skb) {
1124                 mp->outskb = NULL;
1125                 __skb_queue_tail(&mp->outqueue, skb);
1126                 mp->outbytes += skb->len;
1127                 spin_unlock_bh(&mp->outlock);
1128
1129                 handle_minor_send(mp);
1130         } else
1131                 spin_unlock_bh(&mp->outlock);
1132
1133         handle_minor_recv(mp);
1134 }
1135
1136 static int capinc_tty_write_room(struct tty_struct *tty)
1137 {
1138         struct capiminor *mp = tty->driver_data;
1139         int room;
1140
1141         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1142         room *= CAPI_MAX_BLKSIZE;
1143         pr_debug("capinc_tty_write_room = %d\n", room);
1144         return room;
1145 }
1146
1147 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1148 {
1149         struct capiminor *mp = tty->driver_data;
1150
1151         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1152                  mp->outbytes, mp->nack,
1153                  skb_queue_len(&mp->outqueue),
1154                  skb_queue_len(&mp->inqueue));
1155         return mp->outbytes;
1156 }
1157
1158 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1159 {
1160         pr_debug("capinc_tty_set_termios\n");
1161 }
1162
1163 static void capinc_tty_throttle(struct tty_struct *tty)
1164 {
1165         struct capiminor *mp = tty->driver_data;
1166         pr_debug("capinc_tty_throttle\n");
1167         mp->ttyinstop = 1;
1168 }
1169
1170 static void capinc_tty_unthrottle(struct tty_struct *tty)
1171 {
1172         struct capiminor *mp = tty->driver_data;
1173
1174         pr_debug("capinc_tty_unthrottle\n");
1175         mp->ttyinstop = 0;
1176         handle_minor_recv(mp);
1177 }
1178
1179 static void capinc_tty_stop(struct tty_struct *tty)
1180 {
1181         struct capiminor *mp = tty->driver_data;
1182
1183         pr_debug("capinc_tty_stop\n");
1184         mp->ttyoutstop = 1;
1185 }
1186
1187 static void capinc_tty_start(struct tty_struct *tty)
1188 {
1189         struct capiminor *mp = tty->driver_data;
1190
1191         pr_debug("capinc_tty_start\n");
1192         mp->ttyoutstop = 0;
1193         handle_minor_send(mp);
1194 }
1195
1196 static void capinc_tty_hangup(struct tty_struct *tty)
1197 {
1198         struct capiminor *mp = tty->driver_data;
1199
1200         pr_debug("capinc_tty_hangup\n");
1201         tty_port_hangup(&mp->port);
1202 }
1203
1204 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1205 {
1206         pr_debug("capinc_tty_break_ctl(%d)\n", state);
1207         return 0;
1208 }
1209
1210 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1211 {
1212         pr_debug("capinc_tty_flush_buffer\n");
1213 }
1214
1215 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1216 {
1217         pr_debug("capinc_tty_set_ldisc\n");
1218 }
1219
1220 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1221 {
1222         pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1223 }
1224
1225 static const struct tty_operations capinc_ops = {
1226         .open = capinc_tty_open,
1227         .close = capinc_tty_close,
1228         .write = capinc_tty_write,
1229         .put_char = capinc_tty_put_char,
1230         .flush_chars = capinc_tty_flush_chars,
1231         .write_room = capinc_tty_write_room,
1232         .chars_in_buffer = capinc_tty_chars_in_buffer,
1233         .set_termios = capinc_tty_set_termios,
1234         .throttle = capinc_tty_throttle,
1235         .unthrottle = capinc_tty_unthrottle,
1236         .stop = capinc_tty_stop,
1237         .start = capinc_tty_start,
1238         .hangup = capinc_tty_hangup,
1239         .break_ctl = capinc_tty_break_ctl,
1240         .flush_buffer = capinc_tty_flush_buffer,
1241         .set_ldisc = capinc_tty_set_ldisc,
1242         .send_xchar = capinc_tty_send_xchar,
1243         .install = capinc_tty_install,
1244         .cleanup = capinc_tty_cleanup,
1245 };
1246
1247 static int __init capinc_tty_init(void)
1248 {
1249         struct tty_driver *drv;
1250         int err;
1251
1252         if (capi_ttyminors > CAPINC_MAX_PORTS)
1253                 capi_ttyminors = CAPINC_MAX_PORTS;
1254         if (capi_ttyminors <= 0)
1255                 capi_ttyminors = CAPINC_NR_PORTS;
1256
1257         capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1258                              GFP_KERNEL);
1259         if (!capiminors)
1260                 return -ENOMEM;
1261
1262         drv = alloc_tty_driver(capi_ttyminors);
1263         if (!drv) {
1264                 kfree(capiminors);
1265                 return -ENOMEM;
1266         }
1267         drv->driver_name = "capi_nc";
1268         drv->name = "capi!";
1269         drv->major = 0;
1270         drv->minor_start = 0;
1271         drv->type = TTY_DRIVER_TYPE_SERIAL;
1272         drv->subtype = SERIAL_TYPE_NORMAL;
1273         drv->init_termios = tty_std_termios;
1274         drv->init_termios.c_iflag = ICRNL;
1275         drv->init_termios.c_oflag = OPOST | ONLCR;
1276         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1277         drv->init_termios.c_lflag = 0;
1278         drv->flags =
1279                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1280                 TTY_DRIVER_DYNAMIC_DEV;
1281         tty_set_operations(drv, &capinc_ops);
1282
1283         err = tty_register_driver(drv);
1284         if (err) {
1285                 put_tty_driver(drv);
1286                 kfree(capiminors);
1287                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1288                 return err;
1289         }
1290         capinc_tty_driver = drv;
1291         return 0;
1292 }
1293
1294 static void __exit capinc_tty_exit(void)
1295 {
1296         tty_unregister_driver(capinc_tty_driver);
1297         put_tty_driver(capinc_tty_driver);
1298         kfree(capiminors);
1299 }
1300
1301 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1302
1303 static inline int capinc_tty_init(void)
1304 {
1305         return 0;
1306 }
1307
1308 static inline void capinc_tty_exit(void) { }
1309
1310 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1311
1312 /* -------- /proc functions ----------------------------------------- */
1313
1314 /*
1315  * /proc/capi/capi20:
1316  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1317  */
1318 static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1319 {
1320         struct capidev *cdev;
1321         struct list_head *l;
1322
1323         mutex_lock(&capidev_list_lock);
1324         list_for_each(l, &capidev_list) {
1325                 cdev = list_entry(l, struct capidev, list);
1326                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1327                            cdev->ap.applid,
1328                            cdev->ap.nrecvctlpkt,
1329                            cdev->ap.nrecvdatapkt,
1330                            cdev->ap.nsentctlpkt,
1331                            cdev->ap.nsentdatapkt);
1332         }
1333         mutex_unlock(&capidev_list_lock);
1334         return 0;
1335 }
1336
1337 /*
1338  * /proc/capi/capi20ncci:
1339  *  applid ncci
1340  */
1341 static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1342 {
1343         struct capidev *cdev;
1344         struct capincci *np;
1345
1346         mutex_lock(&capidev_list_lock);
1347         list_for_each_entry(cdev, &capidev_list, list) {
1348                 mutex_lock(&cdev->lock);
1349                 list_for_each_entry(np, &cdev->nccis, list)
1350                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1351                 mutex_unlock(&cdev->lock);
1352         }
1353         mutex_unlock(&capidev_list_lock);
1354         return 0;
1355 }
1356
1357 static void __init proc_init(void)
1358 {
1359         proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1360         proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1361 }
1362
1363 static void __exit proc_exit(void)
1364 {
1365         remove_proc_entry("capi/capi20", NULL);
1366         remove_proc_entry("capi/capi20ncci", NULL);
1367 }
1368
1369 /* -------- init function and module interface ---------------------- */
1370
1371
1372 static int __init capi_init(void)
1373 {
1374         const char *compileinfo;
1375         int major_ret;
1376
1377         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1378         if (major_ret < 0) {
1379                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1380                 return major_ret;
1381         }
1382         capi_class = class_create(THIS_MODULE, "capi");
1383         if (IS_ERR(capi_class)) {
1384                 unregister_chrdev(capi_major, "capi20");
1385                 return PTR_ERR(capi_class);
1386         }
1387
1388         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1389
1390         if (capinc_tty_init() < 0) {
1391                 device_destroy(capi_class, MKDEV(capi_major, 0));
1392                 class_destroy(capi_class);
1393                 unregister_chrdev(capi_major, "capi20");
1394                 return -ENOMEM;
1395         }
1396
1397         proc_init();
1398
1399 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1400         compileinfo = " (middleware)";
1401 #else
1402         compileinfo = " (no middleware)";
1403 #endif
1404         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1405                capi_major, compileinfo);
1406
1407         return 0;
1408 }
1409
1410 static void __exit capi_exit(void)
1411 {
1412         proc_exit();
1413
1414         device_destroy(capi_class, MKDEV(capi_major, 0));
1415         class_destroy(capi_class);
1416         unregister_chrdev(capi_major, "capi20");
1417
1418         capinc_tty_exit();
1419 }
1420
1421 module_init(capi_init);
1422 module_exit(capi_exit);