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/ppp-ioctl.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 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  42 MODULE_AUTHOR("Carsten Paeth");
  43 MODULE_LICENSE("GPL");
  44
  45 /* -------- driver information -------------------------------------- */
  46
  47 static DEFINE_MUTEX(capi_mutex);
  48 static struct class *capi_class;
  49 static int capi_major = 68;             /* allocated */
  50
  51 module_param_named(major, capi_major, uint, 0);
  52
  53 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  54 #define CAPINC_NR_PORTS         32
  55 #define CAPINC_MAX_PORTS        256
  56
  57 static int capi_ttyminors = CAPINC_NR_PORTS;
  58
  59 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  60 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  61
  62 /* -------- defines ------------------------------------------------- */
  63
  64 #define CAPINC_MAX_RECVQUEUE    10
  65 #define CAPINC_MAX_SENDQUEUE    10
  66 #define CAPI_MAX_BLKSIZE        2048
  67
  68 /* -------- data structures ----------------------------------------- */
  69
  70 struct capidev;
  71 struct capincci;
  72 struct capiminor;
  73
  74 struct ackqueue_entry {
  75         struct list_head        list;
  76         u16                     datahandle;
  77 };
  78
  79 struct capiminor {
  80         struct kref kref;
  81
  82         unsigned int      minor;
  83
  84         struct capi20_appl      *ap;
  85         u32                     ncci;
  86         atomic_t                datahandle;
  87         atomic_t                msgid;
  88
  89         struct tty_port port;
  90         int                ttyinstop;
  91         int                ttyoutstop;
  92
  93         struct sk_buff_head     inqueue;
  94
  95         struct sk_buff_head     outqueue;
  96         int                     outbytes;
  97         struct sk_buff          *outskb;
  98         spinlock_t              outlock;
  99
 100         /* transmit path */
 101         struct list_head ackqueue;
 102         int nack;
 103         spinlock_t ackqlock;
 104 };
 105
 106 struct capincci {
 107         struct list_head list;
 108         u32              ncci;
 109         struct capidev  *cdev;
 110 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 111         struct capiminor *minorp;
 112 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 113 };
 114
 115 struct capidev {
 116         struct list_head list;
 117         struct capi20_appl ap;
 118         u16             errcode;
 119         unsigned        userflags;
 120
 121         struct sk_buff_head recvqueue;
 122         wait_queue_head_t recvwait;
 123
 124         struct list_head nccis;
 125
 126         struct mutex lock;
 127 };
 128
 129 /* -------- global variables ---------------------------------------- */
 130
 131 static DEFINE_MUTEX(capidev_list_lock);
 132 static LIST_HEAD(capidev_list);
 133
 134 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 135
 136 static DEFINE_SPINLOCK(capiminors_lock);
 137 static struct capiminor **capiminors;
 138
 139 static struct tty_driver *capinc_tty_driver;
 140
 141 /* -------- datahandles --------------------------------------------- */
 142
 143 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 144 {
 145         struct ackqueue_entry *n;
 146
 147         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 148         if (unlikely(!n)) {
 149                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 150                 return -1;
 151         }
 152         n->datahandle = datahandle;
 153         INIT_LIST_HEAD(&n->list);
 154         spin_lock_bh(&mp->ackqlock);
 155         list_add_tail(&n->list, &mp->ackqueue);
 156         mp->nack++;
 157         spin_unlock_bh(&mp->ackqlock);
 158         return 0;
 159 }
 160
 161 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 162 {
 163         struct ackqueue_entry *p, *tmp;
 164
 165         spin_lock_bh(&mp->ackqlock);
 166         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 167                 if (p->datahandle == datahandle) {
 168                         list_del(&p->list);
 169                         mp->nack--;
 170                         spin_unlock_bh(&mp->ackqlock);
 171                         kfree(p);
 172                         return 0;
 173                 }
 174         }
 175         spin_unlock_bh(&mp->ackqlock);
 176         return -1;
 177 }
 178
 179 static void capiminor_del_all_ack(struct capiminor *mp)
 180 {
 181         struct ackqueue_entry *p, *tmp;
 182
 183         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 184                 list_del(&p->list);
 185                 kfree(p);
 186                 mp->nack--;
 187         }
 188 }
 189
 190
 191 /* -------- struct capiminor ---------------------------------------- */
 192
 193 static const struct tty_port_operations capiminor_port_ops; /* we have none */
 194
 195 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 196 {
 197         struct capiminor *mp;
 198         struct device *dev;
 199         unsigned int minor;
 200
 201         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 202         if (!mp) {
 203                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 204                 return NULL;
 205         }
 206
 207         kref_init(&mp->kref);
 208
 209         mp->ap = ap;
 210         mp->ncci = ncci;
 211         INIT_LIST_HEAD(&mp->ackqueue);
 212         spin_lock_init(&mp->ackqlock);
 213
 214         skb_queue_head_init(&mp->inqueue);
 215         skb_queue_head_init(&mp->outqueue);
 216         spin_lock_init(&mp->outlock);
 217
 218         tty_port_init(&mp->port);
 219         mp->port.ops = &capiminor_port_ops;
 220
 221         /* Allocate the least unused minor number. */
 222         spin_lock(&capiminors_lock);
 223         for (minor = 0; minor < capi_ttyminors; minor++)
 224                 if (!capiminors[minor]) {
 225                         capiminors[minor] = mp;
 226                         break;
 227                 }
 228         spin_unlock(&capiminors_lock);
 229
 230         if (minor == capi_ttyminors) {
 231                 printk(KERN_NOTICE "capi: out of minors\n");
 232                 goto err_out1;
 233         }
 234
 235         mp->minor = minor;
 236
 237         dev = tty_register_device(capinc_tty_driver, minor, NULL);
 238         if (IS_ERR(dev))
 239                 goto err_out2;
 240
 241         return mp;
 242
 243 err_out2:
 244         spin_lock(&capiminors_lock);
 245         capiminors[minor] = NULL;
 246         spin_unlock(&capiminors_lock);
 247
 248 err_out1:
 249         kfree(mp);
 250         return NULL;
 251 }
 252
 253 static void capiminor_destroy(struct kref *kref)
 254 {
 255         struct capiminor *mp = container_of(kref, struct capiminor, kref);
 256
 257         kfree_skb(mp->outskb);
 258         skb_queue_purge(&mp->inqueue);
 259         skb_queue_purge(&mp->outqueue);
 260         capiminor_del_all_ack(mp);
 261         kfree(mp);
 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                 kref_get(&mp->kref);
 272         spin_unlock(&capiminors_lock);
 273
 274         return mp;
 275 }
 276
 277 static inline void capiminor_put(struct capiminor *mp)
 278 {
 279         kref_put(&mp->kref, capiminor_destroy);
 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 tty_struct *tty;
 574         struct capiminor *mp;
 575         u16 datahandle;
 576         struct capincci *np;
 577 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 578
 579         mutex_lock(&cdev->lock);
 580
 581         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 582                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 583                 if ((info & 0xff00) == 0)
 584                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 585         }
 586         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 587                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 588
 589         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 590                 skb_queue_tail(&cdev->recvqueue, skb);
 591                 wake_up_interruptible(&cdev->recvwait);
 592                 goto unlock_out;
 593         }
 594
 595 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 596         skb_queue_tail(&cdev->recvqueue, skb);
 597         wake_up_interruptible(&cdev->recvwait);
 598
 599 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 600
 601         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 602         if (!np) {
 603                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 604                 skb_queue_tail(&cdev->recvqueue, skb);
 605                 wake_up_interruptible(&cdev->recvwait);
 606                 goto unlock_out;
 607         }
 608
 609         mp = np->minorp;
 610         if (!mp) {
 611                 skb_queue_tail(&cdev->recvqueue, skb);
 612                 wake_up_interruptible(&cdev->recvwait);
 613                 goto unlock_out;
 614         }
 615         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 616                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 617                 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
 618                          datahandle, skb->len-CAPIMSG_LEN(skb->data));
 619                 skb_queue_tail(&mp->inqueue, skb);
 620
 621                 handle_minor_recv(mp);
 622
 623         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 624
 625                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 626                 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
 627                          datahandle,
 628                          CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
 629                 kfree_skb(skb);
 630                 capiminor_del_ack(mp, datahandle);
 631                 tty = tty_port_tty_get(&mp->port);
 632                 if (tty) {
 633                         tty_wakeup(tty);
 634                         tty_kref_put(tty);
 635                 }
 636                 handle_minor_send(mp);
 637
 638         } else {
 639                 /* ups, let capi application handle it :-) */
 640                 skb_queue_tail(&cdev->recvqueue, skb);
 641                 wake_up_interruptible(&cdev->recvwait);
 642         }
 643 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 644
 645 unlock_out:
 646         mutex_unlock(&cdev->lock);
 647 }
 648
 649 /* -------- file_operations for capidev ----------------------------- */
 650
 651 static ssize_t
 652 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 653 {
 654         struct capidev *cdev = file->private_data;
 655         struct sk_buff *skb;
 656         size_t copied;
 657         int err;
 658
 659         if (!cdev->ap.applid)
 660                 return -ENODEV;
 661
 662         skb = skb_dequeue(&cdev->recvqueue);
 663         if (!skb) {
 664                 if (file->f_flags & O_NONBLOCK)
 665                         return -EAGAIN;
 666                 err = wait_event_interruptible(cdev->recvwait,
 667                                                (skb = skb_dequeue(&cdev->recvqueue)));
 668                 if (err)
 669                         return err;
 670         }
 671         if (skb->len > count) {
 672                 skb_queue_head(&cdev->recvqueue, skb);
 673                 return -EMSGSIZE;
 674         }
 675         if (copy_to_user(buf, skb->data, skb->len)) {
 676                 skb_queue_head(&cdev->recvqueue, skb);
 677                 return -EFAULT;
 678         }
 679         copied = skb->len;
 680
 681         kfree_skb(skb);
 682
 683         return copied;
 684 }
 685
 686 static ssize_t
 687 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 688 {
 689         struct capidev *cdev = file->private_data;
 690         struct sk_buff *skb;
 691         u16 mlen;
 692
 693         if (!cdev->ap.applid)
 694                 return -ENODEV;
 695
 696         skb = alloc_skb(count, GFP_USER);
 697         if (!skb)
 698                 return -ENOMEM;
 699
 700         if (copy_from_user(skb_put(skb, count), buf, count)) {
 701                 kfree_skb(skb);
 702                 return -EFAULT;
 703         }
 704         mlen = CAPIMSG_LEN(skb->data);
 705         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 706                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 707                         kfree_skb(skb);
 708                         return -EINVAL;
 709                 }
 710         } else {
 711                 if (mlen != count) {
 712                         kfree_skb(skb);
 713                         return -EINVAL;
 714                 }
 715         }
 716         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 717
 718         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 719                 mutex_lock(&cdev->lock);
 720                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 721                 mutex_unlock(&cdev->lock);
 722         }
 723
 724         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 725
 726         if (cdev->errcode) {
 727                 kfree_skb(skb);
 728                 return -EIO;
 729         }
 730         return count;
 731 }
 732
 733 static unsigned int
 734 capi_poll(struct file *file, poll_table *wait)
 735 {
 736         struct capidev *cdev = file->private_data;
 737         unsigned int mask = 0;
 738
 739         if (!cdev->ap.applid)
 740                 return POLLERR;
 741
 742         poll_wait(file, &(cdev->recvwait), wait);
 743         mask = POLLOUT | POLLWRNORM;
 744         if (!skb_queue_empty(&cdev->recvqueue))
 745                 mask |= POLLIN | POLLRDNORM;
 746         return mask;
 747 }
 748
 749 static int
 750 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 751 {
 752         struct capidev *cdev = file->private_data;
 753         capi_ioctl_struct data;
 754         int retval = -EINVAL;
 755         void __user *argp = (void __user *)arg;
 756
 757         switch (cmd) {
 758         case CAPI_REGISTER:
 759                 mutex_lock(&cdev->lock);
 760
 761                 if (cdev->ap.applid) {
 762                         retval = -EEXIST;
 763                         goto register_out;
 764                 }
 765                 if (copy_from_user(&cdev->ap.rparam, argp,
 766                                    sizeof(struct capi_register_params))) {
 767                         retval = -EFAULT;
 768                         goto register_out;
 769                 }
 770                 cdev->ap.private = cdev;
 771                 cdev->ap.recv_message = capi_recv_message;
 772                 cdev->errcode = capi20_register(&cdev->ap);
 773                 retval = (int)cdev->ap.applid;
 774                 if (cdev->errcode) {
 775                         cdev->ap.applid = 0;
 776                         retval = -EIO;
 777                 }
 778
 779 register_out:
 780                 mutex_unlock(&cdev->lock);
 781                 return retval;
 782
 783         case CAPI_GET_VERSION:
 784                 if (copy_from_user(&data.contr, argp,
 785                                    sizeof(data.contr)))
 786                         return -EFAULT;
 787                 cdev->errcode = capi20_get_version(data.contr, &data.version);
 788                 if (cdev->errcode)
 789                         return -EIO;
 790                 if (copy_to_user(argp, &data.version,
 791                                  sizeof(data.version)))
 792                         return -EFAULT;
 793                 return 0;
 794
 795         case CAPI_GET_SERIAL:
 796                 if (copy_from_user(&data.contr, argp,
 797                                    sizeof(data.contr)))
 798                         return -EFAULT;
 799                 cdev->errcode = capi20_get_serial(data.contr, data.serial);
 800                 if (cdev->errcode)
 801                         return -EIO;
 802                 if (copy_to_user(argp, data.serial,
 803                                  sizeof(data.serial)))
 804                         return -EFAULT;
 805                 return 0;
 806
 807         case CAPI_GET_PROFILE:
 808                 if (copy_from_user(&data.contr, argp,
 809                                    sizeof(data.contr)))
 810                         return -EFAULT;
 811
 812                 if (data.contr == 0) {
 813                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 814                         if (cdev->errcode)
 815                                 return -EIO;
 816
 817                         retval = copy_to_user(argp,
 818                                               &data.profile.ncontroller,
 819                                               sizeof(data.profile.ncontroller));
 820
 821                 } else {
 822                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 823                         if (cdev->errcode)
 824                                 return -EIO;
 825
 826                         retval = copy_to_user(argp, &data.profile,
 827                                               sizeof(data.profile));
 828                 }
 829                 if (retval)
 830                         return -EFAULT;
 831                 return 0;
 832
 833         case CAPI_GET_MANUFACTURER:
 834                 if (copy_from_user(&data.contr, argp,
 835                                    sizeof(data.contr)))
 836                         return -EFAULT;
 837                 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 838                 if (cdev->errcode)
 839                         return -EIO;
 840
 841                 if (copy_to_user(argp, data.manufacturer,
 842                                  sizeof(data.manufacturer)))
 843                         return -EFAULT;
 844
 845                 return 0;
 846
 847         case CAPI_GET_ERRCODE:
 848                 data.errcode = cdev->errcode;
 849                 cdev->errcode = CAPI_NOERROR;
 850                 if (arg) {
 851                         if (copy_to_user(argp, &data.errcode,
 852                                          sizeof(data.errcode)))
 853                                 return -EFAULT;
 854                 }
 855                 return data.errcode;
 856
 857         case CAPI_INSTALLED:
 858                 if (capi20_isinstalled() == CAPI_NOERROR)
 859                         return 0;
 860                 return -ENXIO;
 861
 862         case CAPI_MANUFACTURER_CMD: {
 863                 struct capi_manufacturer_cmd mcmd;
 864                 if (!capable(CAP_SYS_ADMIN))
 865                         return -EPERM;
 866                 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 867                         return -EFAULT;
 868                 return capi20_manufacturer(mcmd.cmd, mcmd.data);
 869         }
 870         case CAPI_SET_FLAGS:
 871         case CAPI_CLR_FLAGS: {
 872                 unsigned userflags;
 873
 874                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 875                         return -EFAULT;
 876
 877                 mutex_lock(&cdev->lock);
 878                 if (cmd == CAPI_SET_FLAGS)
 879                         cdev->userflags |= userflags;
 880                 else
 881                         cdev->userflags &= ~userflags;
 882                 mutex_unlock(&cdev->lock);
 883                 return 0;
 884         }
 885         case CAPI_GET_FLAGS:
 886                 if (copy_to_user(argp, &cdev->userflags,
 887                                  sizeof(cdev->userflags)))
 888                         return -EFAULT;
 889                 return 0;
 890
 891 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 892         case CAPI_NCCI_OPENCOUNT:
 893                 return 0;
 894
 895 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 896         case CAPI_NCCI_OPENCOUNT: {
 897                 struct capincci *nccip;
 898                 unsigned ncci;
 899                 int count = 0;
 900
 901                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 902                         return -EFAULT;
 903
 904                 mutex_lock(&cdev->lock);
 905                 nccip = capincci_find(cdev, (u32)ncci);
 906                 if (nccip)
 907                         count = capincci_minor_opencount(nccip);
 908                 mutex_unlock(&cdev->lock);
 909                 return count;
 910         }
 911
 912         case CAPI_NCCI_GETUNIT: {
 913                 struct capincci *nccip;
 914                 struct capiminor *mp;
 915                 unsigned ncci;
 916                 int unit = -ESRCH;
 917
 918                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 919                         return -EFAULT;
 920
 921                 mutex_lock(&cdev->lock);
 922                 nccip = capincci_find(cdev, (u32)ncci);
 923                 if (nccip) {
 924                         mp = nccip->minorp;
 925                         if (mp)
 926                                 unit = mp->minor;
 927                 }
 928                 mutex_unlock(&cdev->lock);
 929                 return unit;
 930         }
 931 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 932
 933         default:
 934                 return -EINVAL;
 935         }
 936 }
 937
 938 static long
 939 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 940 {
 941         int ret;
 942
 943         mutex_lock(&capi_mutex);
 944         ret = capi_ioctl(file, cmd, arg);
 945         mutex_unlock(&capi_mutex);
 946
 947         return ret;
 948 }
 949
 950 static int capi_open(struct inode *inode, struct file *file)
 951 {
 952         struct capidev *cdev;
 953
 954         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 955         if (!cdev)
 956                 return -ENOMEM;
 957
 958         mutex_init(&cdev->lock);
 959         skb_queue_head_init(&cdev->recvqueue);
 960         init_waitqueue_head(&cdev->recvwait);
 961         INIT_LIST_HEAD(&cdev->nccis);
 962         file->private_data = cdev;
 963
 964         mutex_lock(&capidev_list_lock);
 965         list_add_tail(&cdev->list, &capidev_list);
 966         mutex_unlock(&capidev_list_lock);
 967
 968         return nonseekable_open(inode, file);
 969 }
 970
 971 static int capi_release(struct inode *inode, struct file *file)
 972 {
 973         struct capidev *cdev = file->private_data;
 974
 975         mutex_lock(&capidev_list_lock);
 976         list_del(&cdev->list);
 977         mutex_unlock(&capidev_list_lock);
 978
 979         if (cdev->ap.applid)
 980                 capi20_release(&cdev->ap);
 981         skb_queue_purge(&cdev->recvqueue);
 982         capincci_free(cdev, 0xffffffff);
 983
 984         kfree(cdev);
 985         return 0;
 986 }
 987
 988 static const struct file_operations capi_fops =
 989 {
 990         .owner          = THIS_MODULE,
 991         .llseek         = no_llseek,
 992         .read           = capi_read,
 993         .write          = capi_write,
 994         .poll           = capi_poll,
 995         .unlocked_ioctl = capi_unlocked_ioctl,
 996         .open           = capi_open,
 997         .release        = capi_release,
 998 };
 999
1000 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1001 /* -------- tty_operations for capincci ----------------------------- */
1002
1003 static int
1004 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1005 {
1006         struct capiminor *mp = capiminor_get(tty->index);
1007         int ret = tty_standard_install(driver, tty);
1008
1009         if (ret == 0)
1010                 tty->driver_data = mp;
1011         else
1012                 capiminor_put(mp);
1013         return ret;
1014 }
1015
1016 static void capinc_tty_cleanup(struct tty_struct *tty)
1017 {
1018         struct capiminor *mp = tty->driver_data;
1019         tty->driver_data = NULL;
1020         capiminor_put(mp);
1021 }
1022
1023 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1024 {
1025         struct capiminor *mp = tty->driver_data;
1026         int err;
1027
1028         err = tty_port_open(&mp->port, tty, filp);
1029         if (err)
1030                 return err;
1031
1032         handle_minor_recv(mp);
1033         return 0;
1034 }
1035
1036 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1037 {
1038         struct capiminor *mp = tty->driver_data;
1039
1040         tty_port_close(&mp->port, tty, filp);
1041 }
1042
1043 static int capinc_tty_write(struct tty_struct *tty,
1044                             const unsigned char *buf, int count)
1045 {
1046         struct capiminor *mp = tty->driver_data;
1047         struct sk_buff *skb;
1048
1049         pr_debug("capinc_tty_write(count=%d)\n", count);
1050
1051         spin_lock_bh(&mp->outlock);
1052         skb = mp->outskb;
1053         if (skb) {
1054                 mp->outskb = NULL;
1055                 __skb_queue_tail(&mp->outqueue, skb);
1056                 mp->outbytes += skb->len;
1057         }
1058
1059         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1060         if (!skb) {
1061                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1062                 spin_unlock_bh(&mp->outlock);
1063                 return -ENOMEM;
1064         }
1065
1066         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1067         memcpy(skb_put(skb, count), buf, count);
1068
1069         __skb_queue_tail(&mp->outqueue, skb);
1070         mp->outbytes += skb->len;
1071         spin_unlock_bh(&mp->outlock);
1072
1073         handle_minor_send(mp);
1074
1075         return count;
1076 }
1077
1078 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1079 {
1080         struct capiminor *mp = tty->driver_data;
1081         bool invoke_send = false;
1082         struct sk_buff *skb;
1083         int ret = 1;
1084
1085         pr_debug("capinc_put_char(%u)\n", ch);
1086
1087         spin_lock_bh(&mp->outlock);
1088         skb = mp->outskb;
1089         if (skb) {
1090                 if (skb_tailroom(skb) > 0) {
1091                         *(skb_put(skb, 1)) = ch;
1092                         goto unlock_out;
1093                 }
1094                 mp->outskb = NULL;
1095                 __skb_queue_tail(&mp->outqueue, skb);
1096                 mp->outbytes += skb->len;
1097                 invoke_send = true;
1098         }
1099
1100         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1101         if (skb) {
1102                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1103                 *(skb_put(skb, 1)) = ch;
1104                 mp->outskb = skb;
1105         } else {
1106                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1107                 ret = 0;
1108         }
1109
1110 unlock_out:
1111         spin_unlock_bh(&mp->outlock);
1112
1113         if (invoke_send)
1114                 handle_minor_send(mp);
1115
1116         return ret;
1117 }
1118
1119 static void capinc_tty_flush_chars(struct tty_struct *tty)
1120 {
1121         struct capiminor *mp = tty->driver_data;
1122         struct sk_buff *skb;
1123
1124         pr_debug("capinc_tty_flush_chars\n");
1125
1126         spin_lock_bh(&mp->outlock);
1127         skb = mp->outskb;
1128         if (skb) {
1129                 mp->outskb = NULL;
1130                 __skb_queue_tail(&mp->outqueue, skb);
1131                 mp->outbytes += skb->len;
1132                 spin_unlock_bh(&mp->outlock);
1133
1134                 handle_minor_send(mp);
1135         } else
1136                 spin_unlock_bh(&mp->outlock);
1137
1138         handle_minor_recv(mp);
1139 }
1140
1141 static int capinc_tty_write_room(struct tty_struct *tty)
1142 {
1143         struct capiminor *mp = tty->driver_data;
1144         int room;
1145
1146         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1147         room *= CAPI_MAX_BLKSIZE;
1148         pr_debug("capinc_tty_write_room = %d\n", room);
1149         return room;
1150 }
1151
1152 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1153 {
1154         struct capiminor *mp = tty->driver_data;
1155
1156         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1157                  mp->outbytes, mp->nack,
1158                  skb_queue_len(&mp->outqueue),
1159                  skb_queue_len(&mp->inqueue));
1160         return mp->outbytes;
1161 }
1162
1163 static int capinc_tty_ioctl(struct tty_struct *tty,
1164                             unsigned int cmd, unsigned long arg)
1165 {
1166         return -ENOIOCTLCMD;
1167 }
1168
1169 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1170 {
1171         pr_debug("capinc_tty_set_termios\n");
1172 }
1173
1174 static void capinc_tty_throttle(struct tty_struct *tty)
1175 {
1176         struct capiminor *mp = tty->driver_data;
1177         pr_debug("capinc_tty_throttle\n");
1178         mp->ttyinstop = 1;
1179 }
1180
1181 static void capinc_tty_unthrottle(struct tty_struct *tty)
1182 {
1183         struct capiminor *mp = tty->driver_data;
1184
1185         pr_debug("capinc_tty_unthrottle\n");
1186         mp->ttyinstop = 0;
1187         handle_minor_recv(mp);
1188 }
1189
1190 static void capinc_tty_stop(struct tty_struct *tty)
1191 {
1192         struct capiminor *mp = tty->driver_data;
1193
1194         pr_debug("capinc_tty_stop\n");
1195         mp->ttyoutstop = 1;
1196 }
1197
1198 static void capinc_tty_start(struct tty_struct *tty)
1199 {
1200         struct capiminor *mp = tty->driver_data;
1201
1202         pr_debug("capinc_tty_start\n");
1203         mp->ttyoutstop = 0;
1204         handle_minor_send(mp);
1205 }
1206
1207 static void capinc_tty_hangup(struct tty_struct *tty)
1208 {
1209         struct capiminor *mp = tty->driver_data;
1210
1211         pr_debug("capinc_tty_hangup\n");
1212         tty_port_hangup(&mp->port);
1213 }
1214
1215 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1216 {
1217         pr_debug("capinc_tty_break_ctl(%d)\n", state);
1218         return 0;
1219 }
1220
1221 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1222 {
1223         pr_debug("capinc_tty_flush_buffer\n");
1224 }
1225
1226 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1227 {
1228         pr_debug("capinc_tty_set_ldisc\n");
1229 }
1230
1231 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1232 {
1233         pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1234 }
1235
1236 static const struct tty_operations capinc_ops = {
1237         .open = capinc_tty_open,
1238         .close = capinc_tty_close,
1239         .write = capinc_tty_write,
1240         .put_char = capinc_tty_put_char,
1241         .flush_chars = capinc_tty_flush_chars,
1242         .write_room = capinc_tty_write_room,
1243         .chars_in_buffer = capinc_tty_chars_in_buffer,
1244         .ioctl = capinc_tty_ioctl,
1245         .set_termios = capinc_tty_set_termios,
1246         .throttle = capinc_tty_throttle,
1247         .unthrottle = capinc_tty_unthrottle,
1248         .stop = capinc_tty_stop,
1249         .start = capinc_tty_start,
1250         .hangup = capinc_tty_hangup,
1251         .break_ctl = capinc_tty_break_ctl,
1252         .flush_buffer = capinc_tty_flush_buffer,
1253         .set_ldisc = capinc_tty_set_ldisc,
1254         .send_xchar = capinc_tty_send_xchar,
1255         .install = capinc_tty_install,
1256         .cleanup = capinc_tty_cleanup,
1257 };
1258
1259 static int __init capinc_tty_init(void)
1260 {
1261         struct tty_driver *drv;
1262         int err;
1263
1264         if (capi_ttyminors > CAPINC_MAX_PORTS)
1265                 capi_ttyminors = CAPINC_MAX_PORTS;
1266         if (capi_ttyminors <= 0)
1267                 capi_ttyminors = CAPINC_NR_PORTS;
1268
1269         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1270                              GFP_KERNEL);
1271         if (!capiminors)
1272                 return -ENOMEM;
1273
1274         drv = alloc_tty_driver(capi_ttyminors);
1275         if (!drv) {
1276                 kfree(capiminors);
1277                 return -ENOMEM;
1278         }
1279         drv->driver_name = "capi_nc";
1280         drv->name = "capi";
1281         drv->major = 0;
1282         drv->minor_start = 0;
1283         drv->type = TTY_DRIVER_TYPE_SERIAL;
1284         drv->subtype = SERIAL_TYPE_NORMAL;
1285         drv->init_termios = tty_std_termios;
1286         drv->init_termios.c_iflag = ICRNL;
1287         drv->init_termios.c_oflag = OPOST | ONLCR;
1288         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1289         drv->init_termios.c_lflag = 0;
1290         drv->flags =
1291                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1292                 TTY_DRIVER_DYNAMIC_DEV;
1293         tty_set_operations(drv, &capinc_ops);
1294
1295         err = tty_register_driver(drv);
1296         if (err) {
1297                 put_tty_driver(drv);
1298                 kfree(capiminors);
1299                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1300                 return err;
1301         }
1302         capinc_tty_driver = drv;
1303         return 0;
1304 }
1305
1306 static void __exit capinc_tty_exit(void)
1307 {
1308         tty_unregister_driver(capinc_tty_driver);
1309         put_tty_driver(capinc_tty_driver);
1310         kfree(capiminors);
1311 }
1312
1313 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1314
1315 static inline int capinc_tty_init(void)
1316 {
1317         return 0;
1318 }
1319
1320 static inline void capinc_tty_exit(void) { }
1321
1322 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1323
1324 /* -------- /proc functions ----------------------------------------- */
1325
1326 /*
1327  * /proc/capi/capi20:
1328  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1329  */
1330 static int capi20_proc_show(struct seq_file *m, void *v)
1331 {
1332         struct capidev *cdev;
1333         struct list_head *l;
1334
1335         mutex_lock(&capidev_list_lock);
1336         list_for_each(l, &capidev_list) {
1337                 cdev = list_entry(l, struct capidev, list);
1338                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1339                            cdev->ap.applid,
1340                            cdev->ap.nrecvctlpkt,
1341                            cdev->ap.nrecvdatapkt,
1342                            cdev->ap.nsentctlpkt,
1343                            cdev->ap.nsentdatapkt);
1344         }
1345         mutex_unlock(&capidev_list_lock);
1346         return 0;
1347 }
1348
1349 static int capi20_proc_open(struct inode *inode, struct file *file)
1350 {
1351         return single_open(file, capi20_proc_show, NULL);
1352 }
1353
1354 static const struct file_operations capi20_proc_fops = {
1355         .owner          = THIS_MODULE,
1356         .open           = capi20_proc_open,
1357         .read           = seq_read,
1358         .llseek         = seq_lseek,
1359         .release        = single_release,
1360 };
1361
1362 /*
1363  * /proc/capi/capi20ncci:
1364  *  applid ncci
1365  */
1366 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1367 {
1368         struct capidev *cdev;
1369         struct capincci *np;
1370
1371         mutex_lock(&capidev_list_lock);
1372         list_for_each_entry(cdev, &capidev_list, list) {
1373                 mutex_lock(&cdev->lock);
1374                 list_for_each_entry(np, &cdev->nccis, list)
1375                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1376                 mutex_unlock(&cdev->lock);
1377         }
1378         mutex_unlock(&capidev_list_lock);
1379         return 0;
1380 }
1381
1382 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1383 {
1384         return single_open(file, capi20ncci_proc_show, NULL);
1385 }
1386
1387 static const struct file_operations capi20ncci_proc_fops = {
1388         .owner          = THIS_MODULE,
1389         .open           = capi20ncci_proc_open,
1390         .read           = seq_read,
1391         .llseek         = seq_lseek,
1392         .release        = single_release,
1393 };
1394
1395 static void __init proc_init(void)
1396 {
1397         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1398         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1399 }
1400
1401 static void __exit proc_exit(void)
1402 {
1403         remove_proc_entry("capi/capi20", NULL);
1404         remove_proc_entry("capi/capi20ncci", NULL);
1405 }
1406
1407 /* -------- init function and module interface ---------------------- */
1408
1409
1410 static int __init capi_init(void)
1411 {
1412         const char *compileinfo;
1413         int major_ret;
1414
1415         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1416         if (major_ret < 0) {
1417                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1418                 return major_ret;
1419         }
1420         capi_class = class_create(THIS_MODULE, "capi");
1421         if (IS_ERR(capi_class)) {
1422                 unregister_chrdev(capi_major, "capi20");
1423                 return PTR_ERR(capi_class);
1424         }
1425
1426         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1427
1428         if (capinc_tty_init() < 0) {
1429                 device_destroy(capi_class, MKDEV(capi_major, 0));
1430                 class_destroy(capi_class);
1431                 unregister_chrdev(capi_major, "capi20");
1432                 return -ENOMEM;
1433         }
1434
1435         proc_init();
1436
1437 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1438         compileinfo = " (middleware)";
1439 #else
1440         compileinfo = " (no middleware)";
1441 #endif
1442         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1443                capi_major, compileinfo);
1444
1445         return 0;
1446 }
1447
1448 static void __exit capi_exit(void)
1449 {
1450         proc_exit();
1451
1452         device_destroy(capi_class, MKDEV(capi_major, 0));
1453         class_destroy(capi_class);
1454         unregister_chrdev(capi_major, "capi20");
1455
1456         capinc_tty_exit();
1457 }
1458
1459 module_init(capi_init);
1460 module_exit(capi_exit);