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