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 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 340 {
 341         return 0;
 342 }
 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 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 376 {
 377         struct capincci *np;
 378
 379         list_for_each_entry(np, &cdev->nccis, list)
 380                 if (np->ncci == ncci)
 381                         return np;
 382         return NULL;
 383 }
 384
 385 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 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 tty_struct *tty;
 579         struct capiminor *mp;
 580         u16 datahandle;
 581 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 582         struct capincci *np;
 583
 584         mutex_lock(&cdev->lock);
 585
 586         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 587                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 588                 if ((info & 0xff00) == 0)
 589                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 590         }
 591         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 592                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 593
 594         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 595                 skb_queue_tail(&cdev->recvqueue, skb);
 596                 wake_up_interruptible(&cdev->recvwait);
 597                 goto unlock_out;
 598         }
 599
 600         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 601         if (!np) {
 602                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 603                 skb_queue_tail(&cdev->recvqueue, skb);
 604                 wake_up_interruptible(&cdev->recvwait);
 605                 goto unlock_out;
 606         }
 607
 608 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 609         skb_queue_tail(&cdev->recvqueue, skb);
 610         wake_up_interruptible(&cdev->recvwait);
 611
 612 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 613
 614         mp = np->minorp;
 615         if (!mp) {
 616                 skb_queue_tail(&cdev->recvqueue, skb);
 617                 wake_up_interruptible(&cdev->recvwait);
 618                 goto unlock_out;
 619         }
 620         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 621                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 622                 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
 623                          datahandle, skb->len-CAPIMSG_LEN(skb->data));
 624                 skb_queue_tail(&mp->inqueue, skb);
 625
 626                 handle_minor_recv(mp);
 627
 628         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 629
 630                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 631                 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
 632                          datahandle,
 633                          CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
 634                 kfree_skb(skb);
 635                 capiminor_del_ack(mp, datahandle);
 636                 tty = tty_port_tty_get(&mp->port);
 637                 if (tty) {
 638                         tty_wakeup(tty);
 639                         tty_kref_put(tty);
 640                 }
 641                 handle_minor_send(mp);
 642
 643         } else {
 644                 /* ups, let capi application handle it :-) */
 645                 skb_queue_tail(&cdev->recvqueue, skb);
 646                 wake_up_interruptible(&cdev->recvwait);
 647         }
 648 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 649
 650 unlock_out:
 651         mutex_unlock(&cdev->lock);
 652 }
 653
 654 /* -------- file_operations for capidev ----------------------------- */
 655
 656 static ssize_t
 657 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 658 {
 659         struct capidev *cdev = file->private_data;
 660         struct sk_buff *skb;
 661         size_t copied;
 662         int err;
 663
 664         if (!cdev->ap.applid)
 665                 return -ENODEV;
 666
 667         skb = skb_dequeue(&cdev->recvqueue);
 668         if (!skb) {
 669                 if (file->f_flags & O_NONBLOCK)
 670                         return -EAGAIN;
 671                 err = wait_event_interruptible(cdev->recvwait,
 672                                                (skb = skb_dequeue(&cdev->recvqueue)));
 673                 if (err)
 674                         return err;
 675         }
 676         if (skb->len > count) {
 677                 skb_queue_head(&cdev->recvqueue, skb);
 678                 return -EMSGSIZE;
 679         }
 680         if (copy_to_user(buf, skb->data, skb->len)) {
 681                 skb_queue_head(&cdev->recvqueue, skb);
 682                 return -EFAULT;
 683         }
 684         copied = skb->len;
 685
 686         kfree_skb(skb);
 687
 688         return copied;
 689 }
 690
 691 static ssize_t
 692 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 693 {
 694         struct capidev *cdev = file->private_data;
 695         struct sk_buff *skb;
 696         u16 mlen;
 697
 698         if (!cdev->ap.applid)
 699                 return -ENODEV;
 700
 701         skb = alloc_skb(count, GFP_USER);
 702         if (!skb)
 703                 return -ENOMEM;
 704
 705         if (copy_from_user(skb_put(skb, count), buf, count)) {
 706                 kfree_skb(skb);
 707                 return -EFAULT;
 708         }
 709         mlen = CAPIMSG_LEN(skb->data);
 710         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 711                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 712                         kfree_skb(skb);
 713                         return -EINVAL;
 714                 }
 715         } else {
 716                 if (mlen != count) {
 717                         kfree_skb(skb);
 718                         return -EINVAL;
 719                 }
 720         }
 721         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 722
 723         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 724                 mutex_lock(&cdev->lock);
 725                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 726                 mutex_unlock(&cdev->lock);
 727         }
 728
 729         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 730
 731         if (cdev->errcode) {
 732                 kfree_skb(skb);
 733                 return -EIO;
 734         }
 735         return count;
 736 }
 737
 738 static unsigned int
 739 capi_poll(struct file *file, poll_table *wait)
 740 {
 741         struct capidev *cdev = file->private_data;
 742         unsigned int mask = 0;
 743
 744         if (!cdev->ap.applid)
 745                 return POLLERR;
 746
 747         poll_wait(file, &(cdev->recvwait), wait);
 748         mask = POLLOUT | POLLWRNORM;
 749         if (!skb_queue_empty(&cdev->recvqueue))
 750                 mask |= POLLIN | POLLRDNORM;
 751         return mask;
 752 }
 753
 754 static int
 755 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 756 {
 757         struct capidev *cdev = file->private_data;
 758         capi_ioctl_struct data;
 759         int retval = -EINVAL;
 760         void __user *argp = (void __user *)arg;
 761
 762         switch (cmd) {
 763         case CAPI_REGISTER:
 764                 mutex_lock(&cdev->lock);
 765
 766                 if (cdev->ap.applid) {
 767                         retval = -EEXIST;
 768                         goto register_out;
 769                 }
 770                 if (copy_from_user(&cdev->ap.rparam, argp,
 771                                    sizeof(struct capi_register_params))) {
 772                         retval = -EFAULT;
 773                         goto register_out;
 774                 }
 775                 cdev->ap.private = cdev;
 776                 cdev->ap.recv_message = capi_recv_message;
 777                 cdev->errcode = capi20_register(&cdev->ap);
 778                 retval = (int)cdev->ap.applid;
 779                 if (cdev->errcode) {
 780                         cdev->ap.applid = 0;
 781                         retval = -EIO;
 782                 }
 783
 784 register_out:
 785                 mutex_unlock(&cdev->lock);
 786                 return retval;
 787
 788         case CAPI_GET_VERSION:
 789                 if (copy_from_user(&data.contr, argp,
 790                                    sizeof(data.contr)))
 791                         return -EFAULT;
 792                 cdev->errcode = capi20_get_version(data.contr, &data.version);
 793                 if (cdev->errcode)
 794                         return -EIO;
 795                 if (copy_to_user(argp, &data.version,
 796                                  sizeof(data.version)))
 797                         return -EFAULT;
 798                 return 0;
 799
 800         case CAPI_GET_SERIAL:
 801                 if (copy_from_user(&data.contr, argp,
 802                                    sizeof(data.contr)))
 803                         return -EFAULT;
 804                 cdev->errcode = capi20_get_serial(data.contr, data.serial);
 805                 if (cdev->errcode)
 806                         return -EIO;
 807                 if (copy_to_user(argp, data.serial,
 808                                  sizeof(data.serial)))
 809                         return -EFAULT;
 810                 return 0;
 811
 812         case CAPI_GET_PROFILE:
 813                 if (copy_from_user(&data.contr, argp,
 814                                    sizeof(data.contr)))
 815                         return -EFAULT;
 816
 817                 if (data.contr == 0) {
 818                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 819                         if (cdev->errcode)
 820                                 return -EIO;
 821
 822                         retval = copy_to_user(argp,
 823                                               &data.profile.ncontroller,
 824                                               sizeof(data.profile.ncontroller));
 825
 826                 } else {
 827                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 828                         if (cdev->errcode)
 829                                 return -EIO;
 830
 831                         retval = copy_to_user(argp, &data.profile,
 832                                               sizeof(data.profile));
 833                 }
 834                 if (retval)
 835                         return -EFAULT;
 836                 return 0;
 837
 838         case CAPI_GET_MANUFACTURER:
 839                 if (copy_from_user(&data.contr, argp,
 840                                    sizeof(data.contr)))
 841                         return -EFAULT;
 842                 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 843                 if (cdev->errcode)
 844                         return -EIO;
 845
 846                 if (copy_to_user(argp, data.manufacturer,
 847                                  sizeof(data.manufacturer)))
 848                         return -EFAULT;
 849
 850                 return 0;
 851
 852         case CAPI_GET_ERRCODE:
 853                 data.errcode = cdev->errcode;
 854                 cdev->errcode = CAPI_NOERROR;
 855                 if (arg) {
 856                         if (copy_to_user(argp, &data.errcode,
 857                                          sizeof(data.errcode)))
 858                                 return -EFAULT;
 859                 }
 860                 return data.errcode;
 861
 862         case CAPI_INSTALLED:
 863                 if (capi20_isinstalled() == CAPI_NOERROR)
 864                         return 0;
 865                 return -ENXIO;
 866
 867         case CAPI_MANUFACTURER_CMD: {
 868                 struct capi_manufacturer_cmd mcmd;
 869                 if (!capable(CAP_SYS_ADMIN))
 870                         return -EPERM;
 871                 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 872                         return -EFAULT;
 873                 return capi20_manufacturer(mcmd.cmd, mcmd.data);
 874         }
 875         case CAPI_SET_FLAGS:
 876         case CAPI_CLR_FLAGS: {
 877                 unsigned userflags;
 878
 879                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 880                         return -EFAULT;
 881
 882                 mutex_lock(&cdev->lock);
 883                 if (cmd == CAPI_SET_FLAGS)
 884                         cdev->userflags |= userflags;
 885                 else
 886                         cdev->userflags &= ~userflags;
 887                 mutex_unlock(&cdev->lock);
 888                 return 0;
 889         }
 890         case CAPI_GET_FLAGS:
 891                 if (copy_to_user(argp, &cdev->userflags,
 892                                  sizeof(cdev->userflags)))
 893                         return -EFAULT;
 894                 return 0;
 895
 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 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 913         case CAPI_NCCI_GETUNIT: {
 914                 struct capincci *nccip;
 915                 struct capiminor *mp;
 916                 unsigned ncci;
 917                 int unit = -ESRCH;
 918
 919                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 920                         return -EFAULT;
 921
 922                 mutex_lock(&cdev->lock);
 923                 nccip = capincci_find(cdev, (u32)ncci);
 924                 if (nccip) {
 925                         mp = nccip->minorp;
 926                         if (mp)
 927                                 unit = mp->minor;
 928                 }
 929                 mutex_unlock(&cdev->lock);
 930                 return unit;
 931         }
 932 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 933
 934         default:
 935                 return -EINVAL;
 936         }
 937 }
 938
 939 static long
 940 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 941 {
 942         int ret;
 943
 944         mutex_lock(&capi_mutex);
 945         ret = capi_ioctl(file, cmd, arg);
 946         mutex_unlock(&capi_mutex);
 947
 948         return ret;
 949 }
 950
 951 static int capi_open(struct inode *inode, struct file *file)
 952 {
 953         struct capidev *cdev;
 954
 955         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 956         if (!cdev)
 957                 return -ENOMEM;
 958
 959         mutex_init(&cdev->lock);
 960         skb_queue_head_init(&cdev->recvqueue);
 961         init_waitqueue_head(&cdev->recvwait);
 962         INIT_LIST_HEAD(&cdev->nccis);
 963         file->private_data = cdev;
 964
 965         mutex_lock(&capidev_list_lock);
 966         list_add_tail(&cdev->list, &capidev_list);
 967         mutex_unlock(&capidev_list_lock);
 968
 969         return nonseekable_open(inode, file);
 970 }
 971
 972 static int capi_release(struct inode *inode, struct file *file)
 973 {
 974         struct capidev *cdev = file->private_data;
 975
 976         mutex_lock(&capidev_list_lock);
 977         list_del(&cdev->list);
 978         mutex_unlock(&capidev_list_lock);
 979
 980         if (cdev->ap.applid)
 981                 capi20_release(&cdev->ap);
 982         skb_queue_purge(&cdev->recvqueue);
 983         capincci_free(cdev, 0xffffffff);
 984
 985         kfree(cdev);
 986         return 0;
 987 }
 988
 989 static const struct file_operations capi_fops =
 990 {
 991         .owner          = THIS_MODULE,
 992         .llseek         = no_llseek,
 993         .read           = capi_read,
 994         .write          = capi_write,
 995         .poll           = capi_poll,
 996         .unlocked_ioctl = capi_unlocked_ioctl,
 997         .open           = capi_open,
 998         .release        = capi_release,
 999 };
1000
1001 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1002 /* -------- tty_operations for capincci ----------------------------- */
1003
1004 static int
1005 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1006 {
1007         struct capiminor *mp = capiminor_get(tty->index);
1008         int ret = tty_standard_install(driver, tty);
1009
1010         if (ret == 0)
1011                 tty->driver_data = mp;
1012         else
1013                 capiminor_put(mp);
1014         return ret;
1015 }
1016
1017 static void capinc_tty_cleanup(struct tty_struct *tty)
1018 {
1019         struct capiminor *mp = tty->driver_data;
1020         tty->driver_data = NULL;
1021         capiminor_put(mp);
1022 }
1023
1024 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1025 {
1026         struct capiminor *mp = tty->driver_data;
1027         int err;
1028
1029         err = tty_port_open(&mp->port, tty, filp);
1030         if (err)
1031                 return err;
1032
1033         handle_minor_recv(mp);
1034         return 0;
1035 }
1036
1037 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1038 {
1039         struct capiminor *mp = tty->driver_data;
1040
1041         tty_port_close(&mp->port, tty, filp);
1042 }
1043
1044 static int capinc_tty_write(struct tty_struct *tty,
1045                             const unsigned char *buf, int count)
1046 {
1047         struct capiminor *mp = tty->driver_data;
1048         struct sk_buff *skb;
1049
1050         pr_debug("capinc_tty_write(count=%d)\n", count);
1051
1052         spin_lock_bh(&mp->outlock);
1053         skb = mp->outskb;
1054         if (skb) {
1055                 mp->outskb = NULL;
1056                 __skb_queue_tail(&mp->outqueue, skb);
1057                 mp->outbytes += skb->len;
1058         }
1059
1060         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1061         if (!skb) {
1062                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1063                 spin_unlock_bh(&mp->outlock);
1064                 return -ENOMEM;
1065         }
1066
1067         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1068         memcpy(skb_put(skb, count), buf, count);
1069
1070         __skb_queue_tail(&mp->outqueue, skb);
1071         mp->outbytes += skb->len;
1072         spin_unlock_bh(&mp->outlock);
1073
1074         handle_minor_send(mp);
1075
1076         return count;
1077 }
1078
1079 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1080 {
1081         struct capiminor *mp = tty->driver_data;
1082         bool invoke_send = false;
1083         struct sk_buff *skb;
1084         int ret = 1;
1085
1086         pr_debug("capinc_put_char(%u)\n", ch);
1087
1088         spin_lock_bh(&mp->outlock);
1089         skb = mp->outskb;
1090         if (skb) {
1091                 if (skb_tailroom(skb) > 0) {
1092                         *(skb_put(skb, 1)) = ch;
1093                         goto unlock_out;
1094                 }
1095                 mp->outskb = NULL;
1096                 __skb_queue_tail(&mp->outqueue, skb);
1097                 mp->outbytes += skb->len;
1098                 invoke_send = true;
1099         }
1100
1101         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1102         if (skb) {
1103                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1104                 *(skb_put(skb, 1)) = ch;
1105                 mp->outskb = skb;
1106         } else {
1107                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1108                 ret = 0;
1109         }
1110
1111 unlock_out:
1112         spin_unlock_bh(&mp->outlock);
1113
1114         if (invoke_send)
1115                 handle_minor_send(mp);
1116
1117         return ret;
1118 }
1119
1120 static void capinc_tty_flush_chars(struct tty_struct *tty)
1121 {
1122         struct capiminor *mp = tty->driver_data;
1123         struct sk_buff *skb;
1124
1125         pr_debug("capinc_tty_flush_chars\n");
1126
1127         spin_lock_bh(&mp->outlock);
1128         skb = mp->outskb;
1129         if (skb) {
1130                 mp->outskb = NULL;
1131                 __skb_queue_tail(&mp->outqueue, skb);
1132                 mp->outbytes += skb->len;
1133                 spin_unlock_bh(&mp->outlock);
1134
1135                 handle_minor_send(mp);
1136         } else
1137                 spin_unlock_bh(&mp->outlock);
1138
1139         handle_minor_recv(mp);
1140 }
1141
1142 static int capinc_tty_write_room(struct tty_struct *tty)
1143 {
1144         struct capiminor *mp = tty->driver_data;
1145         int room;
1146
1147         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1148         room *= CAPI_MAX_BLKSIZE;
1149         pr_debug("capinc_tty_write_room = %d\n", room);
1150         return room;
1151 }
1152
1153 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1154 {
1155         struct capiminor *mp = tty->driver_data;
1156
1157         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1158                  mp->outbytes, mp->nack,
1159                  skb_queue_len(&mp->outqueue),
1160                  skb_queue_len(&mp->inqueue));
1161         return mp->outbytes;
1162 }
1163
1164 static int capinc_tty_ioctl(struct tty_struct *tty,
1165                             unsigned int cmd, unsigned long arg)
1166 {
1167         return -ENOIOCTLCMD;
1168 }
1169
1170 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1171 {
1172         pr_debug("capinc_tty_set_termios\n");
1173 }
1174
1175 static void capinc_tty_throttle(struct tty_struct *tty)
1176 {
1177         struct capiminor *mp = tty->driver_data;
1178         pr_debug("capinc_tty_throttle\n");
1179         mp->ttyinstop = 1;
1180 }
1181
1182 static void capinc_tty_unthrottle(struct tty_struct *tty)
1183 {
1184         struct capiminor *mp = tty->driver_data;
1185
1186         pr_debug("capinc_tty_unthrottle\n");
1187         mp->ttyinstop = 0;
1188         handle_minor_recv(mp);
1189 }
1190
1191 static void capinc_tty_stop(struct tty_struct *tty)
1192 {
1193         struct capiminor *mp = tty->driver_data;
1194
1195         pr_debug("capinc_tty_stop\n");
1196         mp->ttyoutstop = 1;
1197 }
1198
1199 static void capinc_tty_start(struct tty_struct *tty)
1200 {
1201         struct capiminor *mp = tty->driver_data;
1202
1203         pr_debug("capinc_tty_start\n");
1204         mp->ttyoutstop = 0;
1205         handle_minor_send(mp);
1206 }
1207
1208 static void capinc_tty_hangup(struct tty_struct *tty)
1209 {
1210         struct capiminor *mp = tty->driver_data;
1211
1212         pr_debug("capinc_tty_hangup\n");
1213         tty_port_hangup(&mp->port);
1214 }
1215
1216 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1217 {
1218         pr_debug("capinc_tty_break_ctl(%d)\n", state);
1219         return 0;
1220 }
1221
1222 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1223 {
1224         pr_debug("capinc_tty_flush_buffer\n");
1225 }
1226
1227 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1228 {
1229         pr_debug("capinc_tty_set_ldisc\n");
1230 }
1231
1232 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1233 {
1234         pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1235 }
1236
1237 static const struct tty_operations capinc_ops = {
1238         .open = capinc_tty_open,
1239         .close = capinc_tty_close,
1240         .write = capinc_tty_write,
1241         .put_char = capinc_tty_put_char,
1242         .flush_chars = capinc_tty_flush_chars,
1243         .write_room = capinc_tty_write_room,
1244         .chars_in_buffer = capinc_tty_chars_in_buffer,
1245         .ioctl = capinc_tty_ioctl,
1246         .set_termios = capinc_tty_set_termios,
1247         .throttle = capinc_tty_throttle,
1248         .unthrottle = capinc_tty_unthrottle,
1249         .stop = capinc_tty_stop,
1250         .start = capinc_tty_start,
1251         .hangup = capinc_tty_hangup,
1252         .break_ctl = capinc_tty_break_ctl,
1253         .flush_buffer = capinc_tty_flush_buffer,
1254         .set_ldisc = capinc_tty_set_ldisc,
1255         .send_xchar = capinc_tty_send_xchar,
1256         .install = capinc_tty_install,
1257         .cleanup = capinc_tty_cleanup,
1258 };
1259
1260 static int __init capinc_tty_init(void)
1261 {
1262         struct tty_driver *drv;
1263         int err;
1264
1265         if (capi_ttyminors > CAPINC_MAX_PORTS)
1266                 capi_ttyminors = CAPINC_MAX_PORTS;
1267         if (capi_ttyminors <= 0)
1268                 capi_ttyminors = CAPINC_NR_PORTS;
1269
1270         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1271                              GFP_KERNEL);
1272         if (!capiminors)
1273                 return -ENOMEM;
1274
1275         drv = alloc_tty_driver(capi_ttyminors);
1276         if (!drv) {
1277                 kfree(capiminors);
1278                 return -ENOMEM;
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         drv->flags =
1292                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1293                 TTY_DRIVER_DYNAMIC_DEV;
1294         tty_set_operations(drv, &capinc_ops);
1295
1296         err = tty_register_driver(drv);
1297         if (err) {
1298                 put_tty_driver(drv);
1299                 kfree(capiminors);
1300                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1301                 return err;
1302         }
1303         capinc_tty_driver = drv;
1304         return 0;
1305 }
1306
1307 static void __exit capinc_tty_exit(void)
1308 {
1309         tty_unregister_driver(capinc_tty_driver);
1310         put_tty_driver(capinc_tty_driver);
1311         kfree(capiminors);
1312 }
1313
1314 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1315
1316 static inline int capinc_tty_init(void)
1317 {
1318         return 0;
1319 }
1320
1321 static inline void capinc_tty_exit(void) { }
1322
1323 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1324
1325 /* -------- /proc functions ----------------------------------------- */
1326
1327 /*
1328  * /proc/capi/capi20:
1329  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1330  */
1331 static int capi20_proc_show(struct seq_file *m, void *v)
1332 {
1333         struct capidev *cdev;
1334         struct list_head *l;
1335
1336         mutex_lock(&capidev_list_lock);
1337         list_for_each(l, &capidev_list) {
1338                 cdev = list_entry(l, struct capidev, list);
1339                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1340                            cdev->ap.applid,
1341                            cdev->ap.nrecvctlpkt,
1342                            cdev->ap.nrecvdatapkt,
1343                            cdev->ap.nsentctlpkt,
1344                            cdev->ap.nsentdatapkt);
1345         }
1346         mutex_unlock(&capidev_list_lock);
1347         return 0;
1348 }
1349
1350 static int capi20_proc_open(struct inode *inode, struct file *file)
1351 {
1352         return single_open(file, capi20_proc_show, NULL);
1353 }
1354
1355 static const struct file_operations capi20_proc_fops = {
1356         .owner          = THIS_MODULE,
1357         .open           = capi20_proc_open,
1358         .read           = seq_read,
1359         .llseek         = seq_lseek,
1360         .release        = single_release,
1361 };
1362
1363 /*
1364  * /proc/capi/capi20ncci:
1365  *  applid ncci
1366  */
1367 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1368 {
1369         struct capidev *cdev;
1370         struct capincci *np;
1371
1372         mutex_lock(&capidev_list_lock);
1373         list_for_each_entry(cdev, &capidev_list, list) {
1374                 mutex_lock(&cdev->lock);
1375                 list_for_each_entry(np, &cdev->nccis, list)
1376                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1377                 mutex_unlock(&cdev->lock);
1378         }
1379         mutex_unlock(&capidev_list_lock);
1380         return 0;
1381 }
1382
1383 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1384 {
1385         return single_open(file, capi20ncci_proc_show, NULL);
1386 }
1387
1388 static const struct file_operations capi20ncci_proc_fops = {
1389         .owner          = THIS_MODULE,
1390         .open           = capi20ncci_proc_open,
1391         .read           = seq_read,
1392         .llseek         = seq_lseek,
1393         .release        = single_release,
1394 };
1395
1396 static void __init proc_init(void)
1397 {
1398         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1399         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1400 }
1401
1402 static void __exit proc_exit(void)
1403 {
1404         remove_proc_entry("capi/capi20", NULL);
1405         remove_proc_entry("capi/capi20ncci", NULL);
1406 }
1407
1408 /* -------- init function and module interface ---------------------- */
1409
1410
1411 static int __init capi_init(void)
1412 {
1413         const char *compileinfo;
1414         int major_ret;
1415
1416         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1417         if (major_ret < 0) {
1418                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1419                 return major_ret;
1420         }
1421         capi_class = class_create(THIS_MODULE, "capi");
1422         if (IS_ERR(capi_class)) {
1423                 unregister_chrdev(capi_major, "capi20");
1424                 return PTR_ERR(capi_class);
1425         }
1426
1427         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1428
1429         if (capinc_tty_init() < 0) {
1430                 device_destroy(capi_class, MKDEV(capi_major, 0));
1431                 class_destroy(capi_class);
1432                 unregister_chrdev(capi_major, "capi20");
1433                 return -ENOMEM;
1434         }
1435
1436         proc_init();
1437
1438 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1439         compileinfo = " (middleware)";
1440 #else
1441         compileinfo = " (no middleware)";
1442 #endif
1443         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1444                capi_major, compileinfo);
1445
1446         return 0;
1447 }
1448
1449 static void __exit capi_exit(void)
1450 {
1451         proc_exit();
1452
1453         device_destroy(capi_class, MKDEV(capi_major, 0));
1454         class_destroy(capi_class);
1455         unregister_chrdev(capi_major, "capi20");
1456
1457         capinc_tty_exit();
1458 }
1459
1460 module_init(capi_init);
1461 module_exit(capi_exit);