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/ethtool.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel.h>
  17 #include <linux/major.h>
  18 #include <linux/sched.h>
  19 #include <linux/slab.h>
  20 #include <linux/fcntl.h>
  21 #include <linux/fs.h>
  22 #include <linux/signal.h>
  23 #include <linux/mutex.h>
  24 #include <linux/mm.h>
  25 #include <linux/timer.h>
  26 #include <linux/wait.h>
  27 #include <linux/tty.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/ppp_defs.h>
  30 #include <linux/ppp-ioctl.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/proc_fs.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/poll.h>
  35 #include <linux/capi.h>
  36 #include <linux/kernelcapi.h>
  37 #include <linux/init.h>
  38 #include <linux/device.h>
  39 #include <linux/moduleparam.h>
  40 #include <linux/isdn/capiutil.h>
  41 #include <linux/isdn/capicmd.h>
  42
  43 #include "kcapi.h"
  44
  45 MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface");
  46 MODULE_AUTHOR("Carsten Paeth");
  47 MODULE_LICENSE("GPL");
  48
  49 /* -------- driver information -------------------------------------- */
  50
  51 static DEFINE_MUTEX(capi_mutex);
  52 static const struct class capi_class = {
  53         .name = "capi",
  54 };
  55 static int capi_major = 68;             /* allocated */
  56
  57 module_param_named(major, capi_major, uint, 0);
  58
  59 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  60 #define CAPINC_NR_PORTS         32
  61 #define CAPINC_MAX_PORTS        256
  62
  63 static int capi_ttyminors = CAPINC_NR_PORTS;
  64
  65 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  66 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  67
  68 /* -------- defines ------------------------------------------------- */
  69
  70 #define CAPINC_MAX_RECVQUEUE    10
  71 #define CAPINC_MAX_SENDQUEUE    10
  72 #define CAPI_MAX_BLKSIZE        2048
  73
  74 /* -------- data structures ----------------------------------------- */
  75
  76 struct capidev;
  77 struct capincci;
  78 struct capiminor;
  79
  80 struct ackqueue_entry {
  81         struct list_head        list;
  82         u16                     datahandle;
  83 };
  84
  85 struct capiminor {
  86         unsigned int      minor;
  87
  88         struct capi20_appl      *ap;
  89         u32                     ncci;
  90         atomic_t                datahandle;
  91         atomic_t                msgid;
  92
  93         struct tty_port port;
  94         int                ttyinstop;
  95         int                ttyoutstop;
  96
  97         struct sk_buff_head     inqueue;
  98
  99         struct sk_buff_head     outqueue;
 100         int                     outbytes;
 101         struct sk_buff          *outskb;
 102         spinlock_t              outlock;
 103
 104         /* transmit path */
 105         struct list_head ackqueue;
 106         int nack;
 107         spinlock_t ackqlock;
 108 };
 109
 110 struct capincci {
 111         struct list_head list;
 112         u32              ncci;
 113         struct capidev  *cdev;
 114 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 115         struct capiminor *minorp;
 116 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 117 };
 118
 119 struct capidev {
 120         struct list_head list;
 121         struct capi20_appl ap;
 122         u16             errcode;
 123         unsigned        userflags;
 124
 125         struct sk_buff_head recvqueue;
 126         wait_queue_head_t recvwait;
 127
 128         struct list_head nccis;
 129
 130         struct mutex lock;
 131 };
 132
 133 /* -------- global variables ---------------------------------------- */
 134
 135 static DEFINE_MUTEX(capidev_list_lock);
 136 static LIST_HEAD(capidev_list);
 137
 138 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 139
 140 static DEFINE_SPINLOCK(capiminors_lock);
 141 static struct capiminor **capiminors;
 142
 143 static struct tty_driver *capinc_tty_driver;
 144
 145 /* -------- datahandles --------------------------------------------- */
 146
 147 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 148 {
 149         struct ackqueue_entry *n;
 150
 151         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 152         if (unlikely(!n)) {
 153                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 154                 return -1;
 155         }
 156         n->datahandle = datahandle;
 157         INIT_LIST_HEAD(&n->list);
 158         spin_lock_bh(&mp->ackqlock);
 159         list_add_tail(&n->list, &mp->ackqueue);
 160         mp->nack++;
 161         spin_unlock_bh(&mp->ackqlock);
 162         return 0;
 163 }
 164
 165 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 166 {
 167         struct ackqueue_entry *p, *tmp;
 168
 169         spin_lock_bh(&mp->ackqlock);
 170         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 171                 if (p->datahandle == datahandle) {
 172                         list_del(&p->list);
 173                         mp->nack--;
 174                         spin_unlock_bh(&mp->ackqlock);
 175                         kfree(p);
 176                         return 0;
 177                 }
 178         }
 179         spin_unlock_bh(&mp->ackqlock);
 180         return -1;
 181 }
 182
 183 static void capiminor_del_all_ack(struct capiminor *mp)
 184 {
 185         struct ackqueue_entry *p, *tmp;
 186
 187         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 188                 list_del(&p->list);
 189                 kfree(p);
 190                 mp->nack--;
 191         }
 192 }
 193
 194
 195 /* -------- struct capiminor ---------------------------------------- */
 196
 197 static void capiminor_destroy(struct tty_port *port)
 198 {
 199         struct capiminor *mp = container_of(port, struct capiminor, port);
 200
 201         kfree_skb(mp->outskb);
 202         skb_queue_purge(&mp->inqueue);
 203         skb_queue_purge(&mp->outqueue);
 204         capiminor_del_all_ack(mp);
 205         kfree(mp);
 206 }
 207
 208 static const struct tty_port_operations capiminor_port_ops = {
 209         .destruct = capiminor_destroy,
 210 };
 211
 212 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 213 {
 214         struct capiminor *mp;
 215         struct device *dev;
 216         unsigned int minor;
 217
 218         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 219         if (!mp) {
 220                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 221                 return NULL;
 222         }
 223
 224         mp->ap = ap;
 225         mp->ncci = ncci;
 226         INIT_LIST_HEAD(&mp->ackqueue);
 227         spin_lock_init(&mp->ackqlock);
 228
 229         skb_queue_head_init(&mp->inqueue);
 230         skb_queue_head_init(&mp->outqueue);
 231         spin_lock_init(&mp->outlock);
 232
 233         tty_port_init(&mp->port);
 234         mp->port.ops = &capiminor_port_ops;
 235
 236         /* Allocate the least unused minor number. */
 237         spin_lock(&capiminors_lock);
 238         for (minor = 0; minor < capi_ttyminors; minor++)
 239                 if (!capiminors[minor]) {
 240                         capiminors[minor] = mp;
 241                         break;
 242                 }
 243         spin_unlock(&capiminors_lock);
 244
 245         if (minor == capi_ttyminors) {
 246                 printk(KERN_NOTICE "capi: out of minors\n");
 247                 goto err_out1;
 248         }
 249
 250         mp->minor = minor;
 251
 252         dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
 253                         NULL);
 254         if (IS_ERR(dev))
 255                 goto err_out2;
 256
 257         return mp;
 258
 259 err_out2:
 260         spin_lock(&capiminors_lock);
 261         capiminors[minor] = NULL;
 262         spin_unlock(&capiminors_lock);
 263
 264 err_out1:
 265         tty_port_put(&mp->port);
 266         return NULL;
 267 }
 268
 269 static struct capiminor *capiminor_get(unsigned int minor)
 270 {
 271         struct capiminor *mp;
 272
 273         spin_lock(&capiminors_lock);
 274         mp = capiminors[minor];
 275         if (mp)
 276                 tty_port_get(&mp->port);
 277         spin_unlock(&capiminors_lock);
 278
 279         return mp;
 280 }
 281
 282 static inline void capiminor_put(struct capiminor *mp)
 283 {
 284         tty_port_put(&mp->port);
 285 }
 286
 287 static void capiminor_free(struct capiminor *mp)
 288 {
 289         tty_unregister_device(capinc_tty_driver, mp->minor);
 290
 291         spin_lock(&capiminors_lock);
 292         capiminors[mp->minor] = NULL;
 293         spin_unlock(&capiminors_lock);
 294
 295         capiminor_put(mp);
 296 }
 297
 298 /* -------- struct capincci ----------------------------------------- */
 299
 300 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 301 {
 302         if (cdev->userflags & CAPIFLAG_HIGHJACKING)
 303                 np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 304 }
 305
 306 static void capincci_free_minor(struct capincci *np)
 307 {
 308         struct capiminor *mp = np->minorp;
 309         struct tty_struct *tty;
 310
 311         if (mp) {
 312                 tty = tty_port_tty_get(&mp->port);
 313                 if (tty) {
 314                         tty_vhangup(tty);
 315                         tty_kref_put(tty);
 316                 }
 317
 318                 capiminor_free(mp);
 319         }
 320 }
 321
 322 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 323 {
 324         struct capiminor *mp = np->minorp;
 325         unsigned int count = 0;
 326         struct tty_struct *tty;
 327
 328         if (mp) {
 329                 tty = tty_port_tty_get(&mp->port);
 330                 if (tty) {
 331                         count = tty->count;
 332                         tty_kref_put(tty);
 333                 }
 334         }
 335         return count;
 336 }
 337
 338 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 339
 340 static inline void
 341 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 342 static inline void capincci_free_minor(struct capincci *np) { }
 343
 344 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 345
 346 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 347 {
 348         struct capincci *np;
 349
 350         np = kzalloc(sizeof(*np), GFP_KERNEL);
 351         if (!np)
 352                 return NULL;
 353         np->ncci = ncci;
 354         np->cdev = cdev;
 355
 356         capincci_alloc_minor(cdev, np);
 357
 358         list_add_tail(&np->list, &cdev->nccis);
 359
 360         return np;
 361 }
 362
 363 static void capincci_free(struct capidev *cdev, u32 ncci)
 364 {
 365         struct capincci *np, *tmp;
 366
 367         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 368                 if (ncci == 0xffffffff || np->ncci == ncci) {
 369                         capincci_free_minor(np);
 370                         list_del(&np->list);
 371                         kfree(np);
 372                 }
 373 }
 374
 375 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 376 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 377 {
 378         struct capincci *np;
 379
 380         list_for_each_entry(np, &cdev->nccis, list)
 381                 if (np->ncci == ncci)
 382                         return np;
 383         return NULL;
 384 }
 385
 386 /* -------- handle data queue --------------------------------------- */
 387
 388 static struct sk_buff *
 389 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 390 {
 391         struct sk_buff *nskb;
 392         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
 393         if (nskb) {
 394                 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 395                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 396                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 397                 capimsg_setu16(s, 2, mp->ap->applid);
 398                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 399                 capimsg_setu8 (s, 5, CAPI_RESP);
 400                 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
 401                 capimsg_setu32(s, 8, mp->ncci);
 402                 capimsg_setu16(s, 12, datahandle);
 403         }
 404         return nskb;
 405 }
 406
 407 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 408 {
 409         unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
 410         struct tty_struct *tty;
 411         struct sk_buff *nskb;
 412         u16 errcode, datahandle;
 413         struct tty_ldisc *ld;
 414         int ret = -1;
 415
 416         tty = tty_port_tty_get(&mp->port);
 417         if (!tty) {
 418                 pr_debug("capi: currently no receiver\n");
 419                 return -1;
 420         }
 421
 422         ld = tty_ldisc_ref(tty);
 423         if (!ld) {
 424                 /* fatal error, do not requeue */
 425                 ret = 0;
 426                 kfree_skb(skb);
 427                 goto deref_tty;
 428         }
 429
 430         if (ld->ops->receive_buf == NULL) {
 431                 pr_debug("capi: ldisc has no receive_buf function\n");
 432                 /* fatal error, do not requeue */
 433                 goto free_skb;
 434         }
 435         if (mp->ttyinstop) {
 436                 pr_debug("capi: recv tty throttled\n");
 437                 goto deref_ldisc;
 438         }
 439
 440         if (tty->receive_room < datalen) {
 441                 pr_debug("capi: no room in tty\n");
 442                 goto deref_ldisc;
 443         }
 444
 445         nskb = gen_data_b3_resp_for(mp, skb);
 446         if (!nskb) {
 447                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 448                 goto deref_ldisc;
 449         }
 450
 451         datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 452
 453         errcode = capi20_put_message(mp->ap, nskb);
 454
 455         if (errcode == CAPI_NOERROR) {
 456                 skb_pull(skb, CAPIMSG_LEN(skb->data));
 457                 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
 458                          datahandle, skb->len);
 459                 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 460         } else {
 461                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 462                        errcode);
 463                 kfree_skb(nskb);
 464
 465                 if (errcode == CAPI_SENDQUEUEFULL)
 466                         goto deref_ldisc;
 467         }
 468
 469 free_skb:
 470         ret = 0;
 471         kfree_skb(skb);
 472
 473 deref_ldisc:
 474         tty_ldisc_deref(ld);
 475
 476 deref_tty:
 477         tty_kref_put(tty);
 478         return ret;
 479 }
 480
 481 static void handle_minor_recv(struct capiminor *mp)
 482 {
 483         struct sk_buff *skb;
 484
 485         while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
 486                 if (handle_recv_skb(mp, skb) < 0) {
 487                         skb_queue_head(&mp->inqueue, skb);
 488                         return;
 489                 }
 490 }
 491
 492 static void handle_minor_send(struct capiminor *mp)
 493 {
 494         struct tty_struct *tty;
 495         struct sk_buff *skb;
 496         u16 len;
 497         u16 errcode;
 498         u16 datahandle;
 499
 500         tty = tty_port_tty_get(&mp->port);
 501         if (!tty)
 502                 return;
 503
 504         if (mp->ttyoutstop) {
 505                 pr_debug("capi: send: tty stopped\n");
 506                 tty_kref_put(tty);
 507                 return;
 508         }
 509
 510         while (1) {
 511                 spin_lock_bh(&mp->outlock);
 512                 skb = __skb_dequeue(&mp->outqueue);
 513                 if (!skb) {
 514                         spin_unlock_bh(&mp->outlock);
 515                         break;
 516                 }
 517                 len = (u16)skb->len;
 518                 mp->outbytes -= len;
 519                 spin_unlock_bh(&mp->outlock);
 520
 521                 datahandle = atomic_inc_return(&mp->datahandle);
 522                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 523                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 524                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 525                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 526                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 527                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 528                 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
 529                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 530                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 531                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 532                 capimsg_setu16(skb->data, 18, datahandle);
 533                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 534
 535                 if (capiminor_add_ack(mp, datahandle) < 0) {
 536                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 537
 538                         spin_lock_bh(&mp->outlock);
 539                         __skb_queue_head(&mp->outqueue, skb);
 540                         mp->outbytes += len;
 541                         spin_unlock_bh(&mp->outlock);
 542
 543                         break;
 544                 }
 545                 errcode = capi20_put_message(mp->ap, skb);
 546                 if (errcode == CAPI_NOERROR) {
 547                         pr_debug("capi: DATA_B3_REQ %u len=%u\n",
 548                                  datahandle, len);
 549                         continue;
 550                 }
 551                 capiminor_del_ack(mp, datahandle);
 552
 553                 if (errcode == CAPI_SENDQUEUEFULL) {
 554                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 555
 556                         spin_lock_bh(&mp->outlock);
 557                         __skb_queue_head(&mp->outqueue, skb);
 558                         mp->outbytes += len;
 559                         spin_unlock_bh(&mp->outlock);
 560
 561                         break;
 562                 }
 563
 564                 /* ups, drop packet */
 565                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 566                 kfree_skb(skb);
 567         }
 568         tty_kref_put(tty);
 569 }
 570
 571 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 572 /* -------- function called by lower level -------------------------- */
 573
 574 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 575 {
 576         struct capidev *cdev = ap->private;
 577 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 578         struct capiminor *mp;
 579         u16 datahandle;
 580         struct capincci *np;
 581 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 582
 583         mutex_lock(&cdev->lock);
 584
 585         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 586                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 587                 if ((info & 0xff00) == 0)
 588                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 589         }
 590         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 591                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 592
 593         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 594                 skb_queue_tail(&cdev->recvqueue, skb);
 595                 wake_up_interruptible(&cdev->recvwait);
 596                 goto unlock_out;
 597         }
 598
 599 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 600         skb_queue_tail(&cdev->recvqueue, skb);
 601         wake_up_interruptible(&cdev->recvwait);
 602
 603 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 604
 605         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 606         if (!np) {
 607                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 608                 skb_queue_tail(&cdev->recvqueue, skb);
 609                 wake_up_interruptible(&cdev->recvwait);
 610                 goto unlock_out;
 611         }
 612
 613         mp = np->minorp;
 614         if (!mp) {
 615                 skb_queue_tail(&cdev->recvqueue, skb);
 616                 wake_up_interruptible(&cdev->recvwait);
 617                 goto unlock_out;
 618         }
 619         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 620                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 621                 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
 622                          datahandle, skb->len-CAPIMSG_LEN(skb->data));
 623                 skb_queue_tail(&mp->inqueue, skb);
 624
 625                 handle_minor_recv(mp);
 626
 627         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 628
 629                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 630                 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
 631                          datahandle,
 632                          CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
 633                 kfree_skb(skb);
 634                 capiminor_del_ack(mp, datahandle);
 635                 tty_port_tty_wakeup(&mp->port);
 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         if (count < CAPIMSG_BASELEN)
 697                 return -EINVAL;
 698
 699         skb = alloc_skb(count, GFP_USER);
 700         if (!skb)
 701                 return -ENOMEM;
 702
 703         if (copy_from_user(skb_put(skb, count), buf, count)) {
 704                 kfree_skb(skb);
 705                 return -EFAULT;
 706         }
 707         mlen = CAPIMSG_LEN(skb->data);
 708         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 709                 if (count < CAPI_DATA_B3_REQ_LEN ||
 710                     (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 711                         kfree_skb(skb);
 712                         return -EINVAL;
 713                 }
 714         } else {
 715                 if (mlen != count) {
 716                         kfree_skb(skb);
 717                         return -EINVAL;
 718                 }
 719         }
 720         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 721
 722         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 723                 if (count < CAPI_DISCONNECT_B3_RESP_LEN) {
 724                         kfree_skb(skb);
 725                         return -EINVAL;
 726                 }
 727                 mutex_lock(&cdev->lock);
 728                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 729                 mutex_unlock(&cdev->lock);
 730         }
 731
 732         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 733
 734         if (cdev->errcode) {
 735                 kfree_skb(skb);
 736                 return -EIO;
 737         }
 738         return count;
 739 }
 740
 741 static __poll_t
 742 capi_poll(struct file *file, poll_table *wait)
 743 {
 744         struct capidev *cdev = file->private_data;
 745         __poll_t mask = 0;
 746
 747         if (!cdev->ap.applid)
 748                 return EPOLLERR;
 749
 750         poll_wait(file, &(cdev->recvwait), wait);
 751         mask = EPOLLOUT | EPOLLWRNORM;
 752         if (!skb_queue_empty_lockless(&cdev->recvqueue))
 753                 mask |= EPOLLIN | EPOLLRDNORM;
 754         return mask;
 755 }
 756
 757 static int
 758 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 759 {
 760         struct capidev *cdev = file->private_data;
 761         capi_ioctl_struct data;
 762         int retval = -EINVAL;
 763         void __user *argp = (void __user *)arg;
 764
 765         switch (cmd) {
 766         case CAPI_REGISTER:
 767                 mutex_lock(&cdev->lock);
 768
 769                 if (cdev->ap.applid) {
 770                         retval = -EEXIST;
 771                         goto register_out;
 772                 }
 773                 if (copy_from_user(&cdev->ap.rparam, argp,
 774                                    sizeof(struct capi_register_params))) {
 775                         retval = -EFAULT;
 776                         goto register_out;
 777                 }
 778                 cdev->ap.private = cdev;
 779                 cdev->ap.recv_message = capi_recv_message;
 780                 cdev->errcode = capi20_register(&cdev->ap);
 781                 retval = (int)cdev->ap.applid;
 782                 if (cdev->errcode) {
 783                         cdev->ap.applid = 0;
 784                         retval = -EIO;
 785                 }
 786
 787 register_out:
 788                 mutex_unlock(&cdev->lock);
 789                 return retval;
 790
 791         case CAPI_GET_VERSION:
 792                 if (copy_from_user(&data.contr, argp,
 793                                    sizeof(data.contr)))
 794                         return -EFAULT;
 795                 cdev->errcode = capi20_get_version(data.contr, &data.version);
 796                 if (cdev->errcode)
 797                         return -EIO;
 798                 if (copy_to_user(argp, &data.version,
 799                                  sizeof(data.version)))
 800                         return -EFAULT;
 801                 return 0;
 802
 803         case CAPI_GET_SERIAL:
 804                 if (copy_from_user(&data.contr, argp,
 805                                    sizeof(data.contr)))
 806                         return -EFAULT;
 807                 cdev->errcode = capi20_get_serial(data.contr, data.serial);
 808                 if (cdev->errcode)
 809                         return -EIO;
 810                 if (copy_to_user(argp, data.serial,
 811                                  sizeof(data.serial)))
 812                         return -EFAULT;
 813                 return 0;
 814
 815         case CAPI_GET_PROFILE:
 816                 if (copy_from_user(&data.contr, argp,
 817                                    sizeof(data.contr)))
 818                         return -EFAULT;
 819
 820                 if (data.contr == 0) {
 821                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 822                         if (cdev->errcode)
 823                                 return -EIO;
 824
 825                         retval = copy_to_user(argp,
 826                                               &data.profile.ncontroller,
 827                                               sizeof(data.profile.ncontroller));
 828
 829                 } else {
 830                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 831                         if (cdev->errcode)
 832                                 return -EIO;
 833
 834                         retval = copy_to_user(argp, &data.profile,
 835                                               sizeof(data.profile));
 836                 }
 837                 if (retval)
 838                         return -EFAULT;
 839                 return 0;
 840
 841         case CAPI_GET_MANUFACTURER:
 842                 if (copy_from_user(&data.contr, argp,
 843                                    sizeof(data.contr)))
 844                         return -EFAULT;
 845                 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 846                 if (cdev->errcode)
 847                         return -EIO;
 848
 849                 if (copy_to_user(argp, data.manufacturer,
 850                                  sizeof(data.manufacturer)))
 851                         return -EFAULT;
 852
 853                 return 0;
 854
 855         case CAPI_GET_ERRCODE:
 856                 data.errcode = cdev->errcode;
 857                 cdev->errcode = CAPI_NOERROR;
 858                 if (arg) {
 859                         if (copy_to_user(argp, &data.errcode,
 860                                          sizeof(data.errcode)))
 861                                 return -EFAULT;
 862                 }
 863                 return data.errcode;
 864
 865         case CAPI_INSTALLED:
 866                 if (capi20_isinstalled() == CAPI_NOERROR)
 867                         return 0;
 868                 return -ENXIO;
 869
 870         case CAPI_MANUFACTURER_CMD: {
 871                 struct capi_manufacturer_cmd mcmd;
 872                 if (!capable(CAP_SYS_ADMIN))
 873                         return -EPERM;
 874                 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 875                         return -EFAULT;
 876                 return capi20_manufacturer(mcmd.cmd, mcmd.data);
 877         }
 878         case CAPI_SET_FLAGS:
 879         case CAPI_CLR_FLAGS: {
 880                 unsigned userflags;
 881
 882                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 883                         return -EFAULT;
 884
 885                 mutex_lock(&cdev->lock);
 886                 if (cmd == CAPI_SET_FLAGS)
 887                         cdev->userflags |= userflags;
 888                 else
 889                         cdev->userflags &= ~userflags;
 890                 mutex_unlock(&cdev->lock);
 891                 return 0;
 892         }
 893         case CAPI_GET_FLAGS:
 894                 if (copy_to_user(argp, &cdev->userflags,
 895                                  sizeof(cdev->userflags)))
 896                         return -EFAULT;
 897                 return 0;
 898
 899 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 900         case CAPI_NCCI_OPENCOUNT:
 901                 return 0;
 902
 903 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 904         case CAPI_NCCI_OPENCOUNT: {
 905                 struct capincci *nccip;
 906                 unsigned ncci;
 907                 int count = 0;
 908
 909                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 910                         return -EFAULT;
 911
 912                 mutex_lock(&cdev->lock);
 913                 nccip = capincci_find(cdev, (u32)ncci);
 914                 if (nccip)
 915                         count = capincci_minor_opencount(nccip);
 916                 mutex_unlock(&cdev->lock);
 917                 return count;
 918         }
 919
 920         case CAPI_NCCI_GETUNIT: {
 921                 struct capincci *nccip;
 922                 struct capiminor *mp;
 923                 unsigned ncci;
 924                 int unit = -ESRCH;
 925
 926                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 927                         return -EFAULT;
 928
 929                 mutex_lock(&cdev->lock);
 930                 nccip = capincci_find(cdev, (u32)ncci);
 931                 if (nccip) {
 932                         mp = nccip->minorp;
 933                         if (mp)
 934                                 unit = mp->minor;
 935                 }
 936                 mutex_unlock(&cdev->lock);
 937                 return unit;
 938         }
 939 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 940
 941         default:
 942                 return -EINVAL;
 943         }
 944 }
 945
 946 static long
 947 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 948 {
 949         int ret;
 950
 951         mutex_lock(&capi_mutex);
 952         ret = capi_ioctl(file, cmd, arg);
 953         mutex_unlock(&capi_mutex);
 954
 955         return ret;
 956 }
 957
 958 #ifdef CONFIG_COMPAT
 959 static long
 960 capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 961 {
 962         int ret;
 963
 964         if (cmd == CAPI_MANUFACTURER_CMD) {
 965                 struct {
 966                         compat_ulong_t cmd;
 967                         compat_uptr_t data;
 968                 } mcmd32;
 969
 970                 if (!capable(CAP_SYS_ADMIN))
 971                         return -EPERM;
 972                 if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
 973                         return -EFAULT;
 974
 975                 mutex_lock(&capi_mutex);
 976                 ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
 977                 mutex_unlock(&capi_mutex);
 978
 979                 return ret;
 980         }
 981
 982         return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 983 }
 984 #endif
 985
 986 static int capi_open(struct inode *inode, struct file *file)
 987 {
 988         struct capidev *cdev;
 989
 990         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 991         if (!cdev)
 992                 return -ENOMEM;
 993
 994         mutex_init(&cdev->lock);
 995         skb_queue_head_init(&cdev->recvqueue);
 996         init_waitqueue_head(&cdev->recvwait);
 997         INIT_LIST_HEAD(&cdev->nccis);
 998         file->private_data = cdev;
 999
1000         mutex_lock(&capidev_list_lock);
1001         list_add_tail(&cdev->list, &capidev_list);
1002         mutex_unlock(&capidev_list_lock);
1003
1004         return stream_open(inode, file);
1005 }
1006
1007 static int capi_release(struct inode *inode, struct file *file)
1008 {
1009         struct capidev *cdev = file->private_data;
1010
1011         mutex_lock(&capidev_list_lock);
1012         list_del(&cdev->list);
1013         mutex_unlock(&capidev_list_lock);
1014
1015         if (cdev->ap.applid)
1016                 capi20_release(&cdev->ap);
1017         skb_queue_purge(&cdev->recvqueue);
1018         capincci_free(cdev, 0xffffffff);
1019
1020         kfree(cdev);
1021         return 0;
1022 }
1023
1024 static const struct file_operations capi_fops =
1025 {
1026         .owner          = THIS_MODULE,
1027         .llseek         = no_llseek,
1028         .read           = capi_read,
1029         .write          = capi_write,
1030         .poll           = capi_poll,
1031         .unlocked_ioctl = capi_unlocked_ioctl,
1032 #ifdef CONFIG_COMPAT
1033         .compat_ioctl   = capi_compat_ioctl,
1034 #endif
1035         .open           = capi_open,
1036         .release        = capi_release,
1037 };
1038
1039 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1040 /* -------- tty_operations for capincci ----------------------------- */
1041
1042 static int
1043 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1044 {
1045         struct capiminor *mp = capiminor_get(tty->index);
1046         int ret = tty_standard_install(driver, tty);
1047
1048         if (ret == 0)
1049                 tty->driver_data = mp;
1050         else
1051                 capiminor_put(mp);
1052         return ret;
1053 }
1054
1055 static void capinc_tty_cleanup(struct tty_struct *tty)
1056 {
1057         struct capiminor *mp = tty->driver_data;
1058         tty->driver_data = NULL;
1059         capiminor_put(mp);
1060 }
1061
1062 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1063 {
1064         struct capiminor *mp = tty->driver_data;
1065         int err;
1066
1067         err = tty_port_open(&mp->port, tty, filp);
1068         if (err)
1069                 return err;
1070
1071         handle_minor_recv(mp);
1072         return 0;
1073 }
1074
1075 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1076 {
1077         struct capiminor *mp = tty->driver_data;
1078
1079         tty_port_close(&mp->port, tty, filp);
1080 }
1081
1082 static ssize_t capinc_tty_write(struct tty_struct *tty, const u8 *buf,
1083                                 size_t count)
1084 {
1085         struct capiminor *mp = tty->driver_data;
1086         struct sk_buff *skb;
1087
1088         pr_debug("capinc_tty_write(count=%zu)\n", count);
1089
1090         spin_lock_bh(&mp->outlock);
1091         skb = mp->outskb;
1092         if (skb) {
1093                 mp->outskb = NULL;
1094                 __skb_queue_tail(&mp->outqueue, skb);
1095                 mp->outbytes += skb->len;
1096         }
1097
1098         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1099         if (!skb) {
1100                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1101                 spin_unlock_bh(&mp->outlock);
1102                 return -ENOMEM;
1103         }
1104
1105         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1106         skb_put_data(skb, buf, count);
1107
1108         __skb_queue_tail(&mp->outqueue, skb);
1109         mp->outbytes += skb->len;
1110         spin_unlock_bh(&mp->outlock);
1111
1112         handle_minor_send(mp);
1113
1114         return count;
1115 }
1116
1117 static int capinc_tty_put_char(struct tty_struct *tty, u8 ch)
1118 {
1119         struct capiminor *mp = tty->driver_data;
1120         bool invoke_send = false;
1121         struct sk_buff *skb;
1122         int ret = 1;
1123
1124         pr_debug("capinc_put_char(%u)\n", ch);
1125
1126         spin_lock_bh(&mp->outlock);
1127         skb = mp->outskb;
1128         if (skb) {
1129                 if (skb_tailroom(skb) > 0) {
1130                         skb_put_u8(skb, ch);
1131                         goto unlock_out;
1132                 }
1133                 mp->outskb = NULL;
1134                 __skb_queue_tail(&mp->outqueue, skb);
1135                 mp->outbytes += skb->len;
1136                 invoke_send = true;
1137         }
1138
1139         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1140         if (skb) {
1141                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1142                 skb_put_u8(skb, ch);
1143                 mp->outskb = skb;
1144         } else {
1145                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1146                 ret = 0;
1147         }
1148
1149 unlock_out:
1150         spin_unlock_bh(&mp->outlock);
1151
1152         if (invoke_send)
1153                 handle_minor_send(mp);
1154
1155         return ret;
1156 }
1157
1158 static void capinc_tty_flush_chars(struct tty_struct *tty)
1159 {
1160         struct capiminor *mp = tty->driver_data;
1161         struct sk_buff *skb;
1162
1163         spin_lock_bh(&mp->outlock);
1164         skb = mp->outskb;
1165         if (skb) {
1166                 mp->outskb = NULL;
1167                 __skb_queue_tail(&mp->outqueue, skb);
1168                 mp->outbytes += skb->len;
1169                 spin_unlock_bh(&mp->outlock);
1170
1171                 handle_minor_send(mp);
1172         } else
1173                 spin_unlock_bh(&mp->outlock);
1174
1175         handle_minor_recv(mp);
1176 }
1177
1178 static unsigned int capinc_tty_write_room(struct tty_struct *tty)
1179 {
1180         struct capiminor *mp = tty->driver_data;
1181         unsigned int room;
1182
1183         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1184         room *= CAPI_MAX_BLKSIZE;
1185         pr_debug("capinc_tty_write_room = %u\n", room);
1186         return room;
1187 }
1188
1189 static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1190 {
1191         struct capiminor *mp = tty->driver_data;
1192
1193         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1194                  mp->outbytes, mp->nack,
1195                  skb_queue_len(&mp->outqueue),
1196                  skb_queue_len(&mp->inqueue));
1197         return mp->outbytes;
1198 }
1199
1200 static void capinc_tty_throttle(struct tty_struct *tty)
1201 {
1202         struct capiminor *mp = tty->driver_data;
1203         mp->ttyinstop = 1;
1204 }
1205
1206 static void capinc_tty_unthrottle(struct tty_struct *tty)
1207 {
1208         struct capiminor *mp = tty->driver_data;
1209
1210         mp->ttyinstop = 0;
1211         handle_minor_recv(mp);
1212 }
1213
1214 static void capinc_tty_stop(struct tty_struct *tty)
1215 {
1216         struct capiminor *mp = tty->driver_data;
1217
1218         mp->ttyoutstop = 1;
1219 }
1220
1221 static void capinc_tty_start(struct tty_struct *tty)
1222 {
1223         struct capiminor *mp = tty->driver_data;
1224
1225         mp->ttyoutstop = 0;
1226         handle_minor_send(mp);
1227 }
1228
1229 static void capinc_tty_hangup(struct tty_struct *tty)
1230 {
1231         struct capiminor *mp = tty->driver_data;
1232
1233         tty_port_hangup(&mp->port);
1234 }
1235
1236 static void capinc_tty_send_xchar(struct tty_struct *tty, u8 ch)
1237 {
1238         pr_debug("capinc_tty_send_xchar(%u)\n", ch);
1239 }
1240
1241 static const struct tty_operations capinc_ops = {
1242         .open = capinc_tty_open,
1243         .close = capinc_tty_close,
1244         .write = capinc_tty_write,
1245         .put_char = capinc_tty_put_char,
1246         .flush_chars = capinc_tty_flush_chars,
1247         .write_room = capinc_tty_write_room,
1248         .chars_in_buffer = capinc_tty_chars_in_buffer,
1249         .throttle = capinc_tty_throttle,
1250         .unthrottle = capinc_tty_unthrottle,
1251         .stop = capinc_tty_stop,
1252         .start = capinc_tty_start,
1253         .hangup = capinc_tty_hangup,
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 = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1270                              GFP_KERNEL);
1271         if (!capiminors)
1272                 return -ENOMEM;
1273
1274         drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW |
1275                         TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV);
1276         if (IS_ERR(drv)) {
1277                 kfree(capiminors);
1278                 return PTR_ERR(drv);
1279         }
1280         drv->driver_name = "capi_nc";
1281         drv->name = "capi!";
1282         drv->major = 0;
1283         drv->minor_start = 0;
1284         drv->type = TTY_DRIVER_TYPE_SERIAL;
1285         drv->subtype = SERIAL_TYPE_NORMAL;
1286         drv->init_termios = tty_std_termios;
1287         drv->init_termios.c_iflag = ICRNL;
1288         drv->init_termios.c_oflag = OPOST | ONLCR;
1289         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1290         drv->init_termios.c_lflag = 0;
1291         tty_set_operations(drv, &capinc_ops);
1292
1293         err = tty_register_driver(drv);
1294         if (err) {
1295                 tty_driver_kref_put(drv);
1296                 kfree(capiminors);
1297                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1298                 return err;
1299         }
1300         capinc_tty_driver = drv;
1301         return 0;
1302 }
1303
1304 static void __exit capinc_tty_exit(void)
1305 {
1306         tty_unregister_driver(capinc_tty_driver);
1307         tty_driver_kref_put(capinc_tty_driver);
1308         kfree(capiminors);
1309 }
1310
1311 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1312
1313 static inline int capinc_tty_init(void)
1314 {
1315         return 0;
1316 }
1317
1318 static inline void capinc_tty_exit(void) { }
1319
1320 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1321
1322 /* -------- /proc functions ----------------------------------------- */
1323
1324 /*
1325  * /proc/capi/capi20:
1326  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1327  */
1328 static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1329 {
1330         struct capidev *cdev;
1331         struct list_head *l;
1332
1333         mutex_lock(&capidev_list_lock);
1334         list_for_each(l, &capidev_list) {
1335                 cdev = list_entry(l, struct capidev, list);
1336                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1337                            cdev->ap.applid,
1338                            cdev->ap.nrecvctlpkt,
1339                            cdev->ap.nrecvdatapkt,
1340                            cdev->ap.nsentctlpkt,
1341                            cdev->ap.nsentdatapkt);
1342         }
1343         mutex_unlock(&capidev_list_lock);
1344         return 0;
1345 }
1346
1347 /*
1348  * /proc/capi/capi20ncci:
1349  *  applid ncci
1350  */
1351 static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1352 {
1353         struct capidev *cdev;
1354         struct capincci *np;
1355
1356         mutex_lock(&capidev_list_lock);
1357         list_for_each_entry(cdev, &capidev_list, list) {
1358                 mutex_lock(&cdev->lock);
1359                 list_for_each_entry(np, &cdev->nccis, list)
1360                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1361                 mutex_unlock(&cdev->lock);
1362         }
1363         mutex_unlock(&capidev_list_lock);
1364         return 0;
1365 }
1366
1367 static void __init proc_init(void)
1368 {
1369         proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1370         proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1371 }
1372
1373 static void __exit proc_exit(void)
1374 {
1375         remove_proc_entry("capi/capi20", NULL);
1376         remove_proc_entry("capi/capi20ncci", NULL);
1377 }
1378
1379 /* -------- init function and module interface ---------------------- */
1380
1381
1382 static int __init capi_init(void)
1383 {
1384         const char *compileinfo;
1385         int major_ret;
1386         int ret;
1387
1388         ret = kcapi_init();
1389         if (ret)
1390                 return ret;
1391
1392         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1393         if (major_ret < 0) {
1394                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1395                 kcapi_exit();
1396                 return major_ret;
1397         }
1398
1399         ret = class_register(&capi_class);
1400         if (ret) {
1401                 unregister_chrdev(capi_major, "capi20");
1402                 kcapi_exit();
1403                 return ret;
1404         }
1405
1406         device_create(&capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1407
1408         if (capinc_tty_init() < 0) {
1409                 device_destroy(&capi_class, MKDEV(capi_major, 0));
1410                 class_unregister(&capi_class);
1411                 unregister_chrdev(capi_major, "capi20");
1412                 kcapi_exit();
1413                 return -ENOMEM;
1414         }
1415
1416         proc_init();
1417
1418 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1419         compileinfo = " (middleware)";
1420 #else
1421         compileinfo = " (no middleware)";
1422 #endif
1423         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1424                capi_major, compileinfo);
1425
1426         return 0;
1427 }
1428
1429 static void __exit capi_exit(void)
1430 {
1431         proc_exit();
1432
1433         device_destroy(&capi_class, MKDEV(capi_major, 0));
1434         class_unregister(&capi_class);
1435         unregister_chrdev(capi_major, "capi20");
1436
1437         capinc_tty_exit();
1438
1439         kcapi_exit();
1440 }
1441
1442 module_init(capi_init);
1443 module_exit(capi_exit);