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   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/smp_lock.h>
  24 #include <linux/timer.h>
  25 #include <linux/wait.h>
  26 #include <linux/tty.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/ppp_defs.h>
  29 #include <linux/if_ppp.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/poll.h>
  34 #include <linux/capi.h>
  35 #include <linux/kernelcapi.h>
  36 #include <linux/init.h>
  37 #include <linux/device.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/isdn/capiutil.h>
  40 #include <linux/isdn/capicmd.h>
  41
  42 #include "capifs.h"
  43
  44 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  45 MODULE_AUTHOR("Carsten Paeth");
  46 MODULE_LICENSE("GPL");
  47
  48 #undef _DEBUG_REFCOUNT          /* alloc/free and open/close debug */
  49 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  50 #undef _DEBUG_DATAFLOW          /* data flow */
  51
  52 /* -------- driver information -------------------------------------- */
  53
  54 static struct class *capi_class;
  55 static int capi_major = 68;             /* allocated */
  56
  57 module_param_named(major, capi_major, uint, 0);
  58
  59 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  60 #define CAPINC_NR_PORTS         32
  61 #define CAPINC_MAX_PORTS        256
  62
  63 static int capi_ttymajor = 191;
  64 static int capi_ttyminors = CAPINC_NR_PORTS;
  65
  66 module_param_named(ttymajor, capi_ttymajor, uint, 0);
  67 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  68 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  69
  70 /* -------- defines ------------------------------------------------- */
  71
  72 #define CAPINC_MAX_RECVQUEUE    10
  73 #define CAPINC_MAX_SENDQUEUE    10
  74 #define CAPI_MAX_BLKSIZE        2048
  75
  76 /* -------- data structures ----------------------------------------- */
  77
  78 struct capidev;
  79 struct capincci;
  80 struct capiminor;
  81
  82 struct datahandle_queue {
  83         struct list_head        list;
  84         u16                     datahandle;
  85 };
  86
  87 struct capiminor {
  88         struct list_head list;
  89         struct capincci  *nccip;
  90         unsigned int      minor;
  91         struct dentry *capifs_dentry;
  92
  93         struct capi20_appl *ap;
  94         u32              ncci;
  95         u16              datahandle;
  96         u16              msgid;
  97
  98         struct tty_struct *tty;
  99         int                ttyinstop;
 100         int                ttyoutstop;
 101         struct sk_buff    *ttyskb;
 102         atomic_t           ttyopencount;
 103
 104         struct sk_buff_head inqueue;
 105         int                 inbytes;
 106         struct sk_buff_head outqueue;
 107         int                 outbytes;
 108
 109         /* transmit path */
 110         struct list_head ackqueue;
 111         int nack;
 112         spinlock_t ackqlock;
 113 };
 114
 115 /* FIXME: The following lock is a sledgehammer-workaround to a
 116  * locking issue with the capiminor (and maybe other) data structure(s).
 117  * Access to this data is done in a racy way and crashes the machine with
 118  * a FritzCard DSL driver; sooner or later. This is a workaround
 119  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 120  * The correct (and scalable) fix for the issue seems to require
 121  * an API change to the drivers... . */
 122 static DEFINE_SPINLOCK(workaround_lock);
 123
 124 struct capincci {
 125         struct list_head list;
 126         u32              ncci;
 127         struct capidev  *cdev;
 128 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 129         struct capiminor *minorp;
 130 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 131 };
 132
 133 struct capidev {
 134         struct list_head list;
 135         struct capi20_appl ap;
 136         u16             errcode;
 137         unsigned        userflags;
 138
 139         struct sk_buff_head recvqueue;
 140         wait_queue_head_t recvwait;
 141
 142         struct list_head nccis;
 143
 144         struct mutex lock;
 145 };
 146
 147 /* -------- global variables ---------------------------------------- */
 148
 149 static DEFINE_MUTEX(capidev_list_lock);
 150 static LIST_HEAD(capidev_list);
 151
 152 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 153
 154 static DEFINE_RWLOCK(capiminor_list_lock);
 155 static LIST_HEAD(capiminor_list);
 156
 157 /* -------- datahandles --------------------------------------------- */
 158
 159 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 160 {
 161         struct datahandle_queue *n;
 162         unsigned long flags;
 163
 164         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 165         if (unlikely(!n)) {
 166                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 167                 return -1;
 168         }
 169         n->datahandle = datahandle;
 170         INIT_LIST_HEAD(&n->list);
 171         spin_lock_irqsave(&mp->ackqlock, flags);
 172         list_add_tail(&n->list, &mp->ackqueue);
 173         mp->nack++;
 174         spin_unlock_irqrestore(&mp->ackqlock, flags);
 175         return 0;
 176 }
 177
 178 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 179 {
 180         struct datahandle_queue *p, *tmp;
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&mp->ackqlock, flags);
 184         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 185                 if (p->datahandle == datahandle) {
 186                         list_del(&p->list);
 187                         kfree(p);
 188                         mp->nack--;
 189                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 190                         return 0;
 191                 }
 192         }
 193         spin_unlock_irqrestore(&mp->ackqlock, flags);
 194         return -1;
 195 }
 196
 197 static void capiminor_del_all_ack(struct capiminor *mp)
 198 {
 199         struct datahandle_queue *p, *tmp;
 200         unsigned long flags;
 201
 202         spin_lock_irqsave(&mp->ackqlock, flags);
 203         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 204                 list_del(&p->list);
 205                 kfree(p);
 206                 mp->nack--;
 207         }
 208         spin_unlock_irqrestore(&mp->ackqlock, flags);
 209 }
 210
 211
 212 /* -------- struct capiminor ---------------------------------------- */
 213
 214 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 215 {
 216         struct capiminor *mp, *p;
 217         unsigned int minor = 0;
 218         unsigned long flags;
 219
 220         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 221         if (!mp) {
 222                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 223                 return NULL;
 224         }
 225
 226         mp->ap = ap;
 227         mp->ncci = ncci;
 228         mp->msgid = 0;
 229         atomic_set(&mp->ttyopencount,0);
 230         INIT_LIST_HEAD(&mp->ackqueue);
 231         spin_lock_init(&mp->ackqlock);
 232
 233         skb_queue_head_init(&mp->inqueue);
 234         skb_queue_head_init(&mp->outqueue);
 235
 236         /* Allocate the least unused minor number.
 237          */
 238         write_lock_irqsave(&capiminor_list_lock, flags);
 239         if (list_empty(&capiminor_list))
 240                 list_add(&mp->list, &capiminor_list);
 241         else {
 242                 list_for_each_entry(p, &capiminor_list, list) {
 243                         if (p->minor > minor)
 244                                 break;
 245                         minor++;
 246                 }
 247
 248                 if (minor < capi_ttyminors) {
 249                         mp->minor = minor;
 250                         list_add(&mp->list, p->list.prev);
 251                 }
 252         }
 253                 write_unlock_irqrestore(&capiminor_list_lock, flags);
 254
 255         if (!(minor < capi_ttyminors)) {
 256                 printk(KERN_NOTICE "capi: out of minors\n");
 257                         kfree(mp);
 258                 return NULL;
 259         }
 260
 261         return mp;
 262 }
 263
 264 static void capiminor_free(struct capiminor *mp)
 265 {
 266         unsigned long flags;
 267
 268         write_lock_irqsave(&capiminor_list_lock, flags);
 269         list_del(&mp->list);
 270         write_unlock_irqrestore(&capiminor_list_lock, flags);
 271
 272         kfree_skb(mp->ttyskb);
 273         mp->ttyskb = NULL;
 274         skb_queue_purge(&mp->inqueue);
 275         skb_queue_purge(&mp->outqueue);
 276         capiminor_del_all_ack(mp);
 277         kfree(mp);
 278 }
 279
 280 static struct capiminor *capiminor_find(unsigned int minor)
 281 {
 282         struct list_head *l;
 283         struct capiminor *p = NULL;
 284
 285         read_lock(&capiminor_list_lock);
 286         list_for_each(l, &capiminor_list) {
 287                 p = list_entry(l, struct capiminor, list);
 288                 if (p->minor == minor)
 289                         break;
 290         }
 291         read_unlock(&capiminor_list_lock);
 292         if (l == &capiminor_list)
 293                 return NULL;
 294
 295         return p;
 296 }
 297
 298 /* -------- struct capincci ----------------------------------------- */
 299
 300 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 301 {
 302         struct capiminor *mp;
 303
 304         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 305                 return;
 306
 307         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 308         if (mp) {
 309                 mp->nccip = np;
 310 #ifdef _DEBUG_REFCOUNT
 311                 printk(KERN_DEBUG "set mp->nccip\n");
 312 #endif
 313                 mp->capifs_dentry =
 314                         capifs_new_ncci(mp->minor,
 315                                         MKDEV(capi_ttymajor, mp->minor));
 316         }
 317 }
 318
 319 static void capincci_free_minor(struct capincci *np)
 320 {
 321         struct capiminor *mp = np->minorp;
 322
 323         if (mp) {
 324                 capifs_free_ncci(mp->capifs_dentry);
 325                 if (mp->tty) {
 326                         mp->nccip = NULL;
 327 #ifdef _DEBUG_REFCOUNT
 328                         printk(KERN_DEBUG "reset mp->nccip\n");
 329 #endif
 330                         tty_hangup(mp->tty);
 331                 } else {
 332                         capiminor_free(mp);
 333                 }
 334         }
 335 }
 336
 337 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 338 {
 339         struct capiminor *mp = np->minorp;
 340
 341         return mp ? atomic_read(&mp->ttyopencount) : 0;
 342 }
 343
 344 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 345
 346 static inline void
 347 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 348 static inline void capincci_free_minor(struct capincci *np) { }
 349
 350 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 351 {
 352         return 0;
 353 }
 354
 355 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 356
 357 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 358 {
 359         struct capincci *np;
 360
 361         np = kzalloc(sizeof(*np), GFP_KERNEL);
 362         if (!np)
 363                 return NULL;
 364         np->ncci = ncci;
 365         np->cdev = cdev;
 366
 367         capincci_alloc_minor(cdev, np);
 368
 369         list_add_tail(&np->list, &cdev->nccis);
 370
 371         return np;
 372 }
 373
 374 static void capincci_free(struct capidev *cdev, u32 ncci)
 375 {
 376         struct capincci *np, *tmp;
 377
 378         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 379                 if (ncci == 0xffffffff || np->ncci == ncci) {
 380                         capincci_free_minor(np);
 381                         list_del(&np->list);
 382                         kfree(np);
 383                 }
 384 }
 385
 386 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 387 {
 388         struct capincci *np;
 389
 390         list_for_each_entry(np, &cdev->nccis, list)
 391                 if (np->ncci == ncci)
 392                         return np;
 393         return NULL;
 394 }
 395
 396 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 397 /* -------- handle data queue --------------------------------------- */
 398
 399 static struct sk_buff *
 400 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 401 {
 402         struct sk_buff *nskb;
 403         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 404         if (nskb) {
 405                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 406                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 407                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 408                 capimsg_setu16(s, 2, mp->ap->applid);
 409                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 410                 capimsg_setu8 (s, 5, CAPI_RESP);
 411                 capimsg_setu16(s, 6, mp->msgid++);
 412                 capimsg_setu32(s, 8, mp->ncci);
 413                 capimsg_setu16(s, 12, datahandle);
 414         }
 415         return nskb;
 416 }
 417
 418 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 419 {
 420         struct sk_buff *nskb;
 421         int datalen;
 422         u16 errcode, datahandle;
 423         struct tty_ldisc *ld;
 424
 425         datalen = skb->len - CAPIMSG_LEN(skb->data);
 426         if (mp->tty == NULL)
 427         {
 428 #ifdef _DEBUG_DATAFLOW
 429                 printk(KERN_DEBUG "capi: currently no receiver\n");
 430 #endif
 431                 return -1;
 432         }
 433
 434         ld = tty_ldisc_ref(mp->tty);
 435         if (ld == NULL)
 436                 return -1;
 437         if (ld->ops->receive_buf == NULL) {
 438 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 439                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 440 #endif
 441                 goto bad;
 442         }
 443         if (mp->ttyinstop) {
 444 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 445                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 446 #endif
 447                 goto bad;
 448         }
 449         if (mp->tty->receive_room < datalen) {
 450 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 451                 printk(KERN_DEBUG "capi: no room in tty\n");
 452 #endif
 453                 goto bad;
 454         }
 455         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 456                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 457                 goto bad;
 458         }
 459         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 460         errcode = capi20_put_message(mp->ap, nskb);
 461         if (errcode != CAPI_NOERROR) {
 462                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 463                                 errcode);
 464                 kfree_skb(nskb);
 465                 goto bad;
 466         }
 467         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 468 #ifdef _DEBUG_DATAFLOW
 469         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 470                                 datahandle, skb->len);
 471 #endif
 472         ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
 473         kfree_skb(skb);
 474         tty_ldisc_deref(ld);
 475         return 0;
 476 bad:
 477         tty_ldisc_deref(ld);
 478         return -1;
 479 }
 480
 481 static void handle_minor_recv(struct capiminor *mp)
 482 {
 483         struct sk_buff *skb;
 484         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 485                 unsigned int len = skb->len;
 486                 mp->inbytes -= len;
 487                 if (handle_recv_skb(mp, skb) < 0) {
 488                         skb_queue_head(&mp->inqueue, skb);
 489                         mp->inbytes += len;
 490                         return;
 491                 }
 492         }
 493 }
 494
 495 static int handle_minor_send(struct capiminor *mp)
 496 {
 497         struct sk_buff *skb;
 498         u16 len;
 499         int count = 0;
 500         u16 errcode;
 501         u16 datahandle;
 502
 503         if (mp->tty && mp->ttyoutstop) {
 504 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 505                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 506 #endif
 507                 return 0;
 508         }
 509
 510         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 511                 datahandle = mp->datahandle;
 512                 len = (u16)skb->len;
 513                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 514                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 515                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 516                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 517                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 518                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 519                 capimsg_setu16(skb->data, 6, mp->msgid++);
 520                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 521                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 522                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 523                 capimsg_setu16(skb->data, 18, datahandle);
 524                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 525
 526                 if (capiminor_add_ack(mp, datahandle) < 0) {
 527                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 528                         skb_queue_head(&mp->outqueue, skb);
 529                         return count;
 530                 }
 531                 errcode = capi20_put_message(mp->ap, skb);
 532                 if (errcode == CAPI_NOERROR) {
 533                         mp->datahandle++;
 534                         count++;
 535                         mp->outbytes -= len;
 536 #ifdef _DEBUG_DATAFLOW
 537                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 538                                                         datahandle, len);
 539 #endif
 540                         continue;
 541                 }
 542                 capiminor_del_ack(mp, datahandle);
 543
 544                 if (errcode == CAPI_SENDQUEUEFULL) {
 545                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 546                         skb_queue_head(&mp->outqueue, skb);
 547                         break;
 548                 }
 549
 550                 /* ups, drop packet */
 551                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 552                 mp->outbytes -= len;
 553                 kfree_skb(skb);
 554         }
 555         return count;
 556 }
 557
 558 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 559 /* -------- function called by lower level -------------------------- */
 560
 561 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 562 {
 563         struct capidev *cdev = ap->private;
 564 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 565         struct capiminor *mp;
 566         u16 datahandle;
 567 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 568         struct capincci *np;
 569         unsigned long flags;
 570
 571         mutex_lock(&cdev->lock);
 572
 573         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 574                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 575                 if ((info & 0xff00) == 0)
 576                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 577         }
 578         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 579                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 580
 581         spin_lock_irqsave(&workaround_lock, flags);
 582         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 583                 skb_queue_tail(&cdev->recvqueue, skb);
 584                 wake_up_interruptible(&cdev->recvwait);
 585                 goto unlock_out;
 586         }
 587
 588         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 589         if (!np) {
 590                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 591                 skb_queue_tail(&cdev->recvqueue, skb);
 592                 wake_up_interruptible(&cdev->recvwait);
 593                 goto unlock_out;
 594         }
 595
 596 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 597         skb_queue_tail(&cdev->recvqueue, skb);
 598         wake_up_interruptible(&cdev->recvwait);
 599
 600 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 601
 602         mp = np->minorp;
 603         if (!mp) {
 604                 skb_queue_tail(&cdev->recvqueue, skb);
 605                 wake_up_interruptible(&cdev->recvwait);
 606                 goto unlock_out;
 607         }
 608         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 609                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 610 #ifdef _DEBUG_DATAFLOW
 611                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 612                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 613 #endif
 614                 skb_queue_tail(&mp->inqueue, skb);
 615                 mp->inbytes += skb->len;
 616                 handle_minor_recv(mp);
 617
 618         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 619
 620                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 621 #ifdef _DEBUG_DATAFLOW
 622                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 623                                 datahandle,
 624                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 625 #endif
 626                 kfree_skb(skb);
 627                 (void)capiminor_del_ack(mp, datahandle);
 628                 if (mp->tty)
 629                         tty_wakeup(mp->tty);
 630                 (void)handle_minor_send(mp);
 631
 632         } else {
 633                 /* ups, let capi application handle it :-) */
 634                 skb_queue_tail(&cdev->recvqueue, skb);
 635                 wake_up_interruptible(&cdev->recvwait);
 636         }
 637 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 638
 639 unlock_out:
 640         spin_unlock_irqrestore(&workaround_lock, flags);
 641         mutex_unlock(&cdev->lock);
 642 }
 643
 644 /* -------- file_operations for capidev ----------------------------- */
 645
 646 static ssize_t
 647 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 648 {
 649         struct capidev *cdev = (struct capidev *)file->private_data;
 650         struct sk_buff *skb;
 651         size_t copied;
 652         int err;
 653
 654         if (!cdev->ap.applid)
 655                 return -ENODEV;
 656
 657         skb = skb_dequeue(&cdev->recvqueue);
 658         if (!skb) {
 659                 if (file->f_flags & O_NONBLOCK)
 660                         return -EAGAIN;
 661                 err = wait_event_interruptible(cdev->recvwait,
 662                                 (skb = skb_dequeue(&cdev->recvqueue)));
 663                 if (err)
 664                         return err;
 665         }
 666         if (skb->len > count) {
 667                 skb_queue_head(&cdev->recvqueue, skb);
 668                 return -EMSGSIZE;
 669         }
 670         if (copy_to_user(buf, skb->data, skb->len)) {
 671                 skb_queue_head(&cdev->recvqueue, skb);
 672                 return -EFAULT;
 673         }
 674         copied = skb->len;
 675
 676         kfree_skb(skb);
 677
 678         return copied;
 679 }
 680
 681 static ssize_t
 682 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 683 {
 684         struct capidev *cdev = (struct capidev *)file->private_data;
 685         struct sk_buff *skb;
 686         u16 mlen;
 687
 688         if (!cdev->ap.applid)
 689                 return -ENODEV;
 690
 691         skb = alloc_skb(count, GFP_USER);
 692         if (!skb)
 693                 return -ENOMEM;
 694
 695         if (copy_from_user(skb_put(skb, count), buf, count)) {
 696                 kfree_skb(skb);
 697                 return -EFAULT;
 698         }
 699         mlen = CAPIMSG_LEN(skb->data);
 700         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 701                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 702                         kfree_skb(skb);
 703                         return -EINVAL;
 704                 }
 705         } else {
 706                 if (mlen != count) {
 707                         kfree_skb(skb);
 708                         return -EINVAL;
 709                 }
 710         }
 711         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 712
 713         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 714                 mutex_lock(&cdev->lock);
 715                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 716                 mutex_unlock(&cdev->lock);
 717         }
 718
 719         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 720
 721         if (cdev->errcode) {
 722                 kfree_skb(skb);
 723                 return -EIO;
 724         }
 725         return count;
 726 }
 727
 728 static unsigned int
 729 capi_poll(struct file *file, poll_table * wait)
 730 {
 731         struct capidev *cdev = (struct capidev *)file->private_data;
 732         unsigned int mask = 0;
 733
 734         if (!cdev->ap.applid)
 735                 return POLLERR;
 736
 737         poll_wait(file, &(cdev->recvwait), wait);
 738         mask = POLLOUT | POLLWRNORM;
 739         if (!skb_queue_empty(&cdev->recvqueue))
 740                 mask |= POLLIN | POLLRDNORM;
 741         return mask;
 742 }
 743
 744 static int
 745 capi_ioctl(struct inode *inode, struct file *file,
 746            unsigned int cmd, unsigned long arg)
 747 {
 748         struct capidev *cdev = file->private_data;
 749         capi_ioctl_struct data;
 750         int retval = -EINVAL;
 751         void __user *argp = (void __user *)arg;
 752
 753         switch (cmd) {
 754         case CAPI_REGISTER:
 755                 mutex_lock(&cdev->lock);
 756
 757                 if (cdev->ap.applid) {
 758                         retval = -EEXIST;
 759                         goto register_out;
 760                 }
 761                 if (copy_from_user(&cdev->ap.rparam, argp,
 762                                    sizeof(struct capi_register_params))) {
 763                         retval = -EFAULT;
 764                         goto register_out;
 765                 }
 766                 cdev->ap.private = cdev;
 767                 cdev->ap.recv_message = capi_recv_message;
 768                 cdev->errcode = capi20_register(&cdev->ap);
 769                 retval = (int)cdev->ap.applid;
 770                 if (cdev->errcode) {
 771                         cdev->ap.applid = 0;
 772                         retval = -EIO;
 773                 }
 774
 775 register_out:
 776                 mutex_unlock(&cdev->lock);
 777                 return retval;
 778
 779         case CAPI_GET_VERSION:
 780                 {
 781                         if (copy_from_user(&data.contr, argp,
 782                                                 sizeof(data.contr)))
 783                                 return -EFAULT;
 784                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 785                         if (cdev->errcode)
 786                                 return -EIO;
 787                         if (copy_to_user(argp, &data.version,
 788                                          sizeof(data.version)))
 789                                 return -EFAULT;
 790                 }
 791                 return 0;
 792
 793         case CAPI_GET_SERIAL:
 794                 {
 795                         if (copy_from_user(&data.contr, argp,
 796                                            sizeof(data.contr)))
 797                                 return -EFAULT;
 798                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 799                         if (cdev->errcode)
 800                                 return -EIO;
 801                         if (copy_to_user(argp, data.serial,
 802                                          sizeof(data.serial)))
 803                                 return -EFAULT;
 804                 }
 805                 return 0;
 806         case CAPI_GET_PROFILE:
 807                 {
 808                         if (copy_from_user(&data.contr, argp,
 809                                            sizeof(data.contr)))
 810                                 return -EFAULT;
 811
 812                         if (data.contr == 0) {
 813                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 814                                 if (cdev->errcode)
 815                                         return -EIO;
 816
 817                                 retval = copy_to_user(argp,
 818                                       &data.profile.ncontroller,
 819                                        sizeof(data.profile.ncontroller));
 820
 821                         } else {
 822                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 823                                 if (cdev->errcode)
 824                                         return -EIO;
 825
 826                                 retval = copy_to_user(argp, &data.profile,
 827                                                    sizeof(data.profile));
 828                         }
 829                         if (retval)
 830                                 return -EFAULT;
 831                 }
 832                 return 0;
 833
 834         case CAPI_GET_MANUFACTURER:
 835                 {
 836                         if (copy_from_user(&data.contr, argp,
 837                                            sizeof(data.contr)))
 838                                 return -EFAULT;
 839                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 840                         if (cdev->errcode)
 841                                 return -EIO;
 842
 843                         if (copy_to_user(argp, data.manufacturer,
 844                                          sizeof(data.manufacturer)))
 845                                 return -EFAULT;
 846
 847                 }
 848                 return 0;
 849         case CAPI_GET_ERRCODE:
 850                 data.errcode = cdev->errcode;
 851                 cdev->errcode = CAPI_NOERROR;
 852                 if (arg) {
 853                         if (copy_to_user(argp, &data.errcode,
 854                                          sizeof(data.errcode)))
 855                                 return -EFAULT;
 856                 }
 857                 return data.errcode;
 858
 859         case CAPI_INSTALLED:
 860                 if (capi20_isinstalled() == CAPI_NOERROR)
 861                         return 0;
 862                 return -ENXIO;
 863
 864         case CAPI_MANUFACTURER_CMD:
 865                 {
 866                         struct capi_manufacturer_cmd mcmd;
 867                         if (!capable(CAP_SYS_ADMIN))
 868                                 return -EPERM;
 869                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 870                                 return -EFAULT;
 871                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 872                 }
 873                 return 0;
 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 int capi_open(struct inode *inode, struct file *file)
 940 {
 941         struct capidev *cdev;
 942
 943         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 944         if (!cdev)
 945                 return -ENOMEM;
 946
 947         mutex_init(&cdev->lock);
 948         skb_queue_head_init(&cdev->recvqueue);
 949         init_waitqueue_head(&cdev->recvwait);
 950         INIT_LIST_HEAD(&cdev->nccis);
 951         file->private_data = cdev;
 952
 953         mutex_lock(&capidev_list_lock);
 954         list_add_tail(&cdev->list, &capidev_list);
 955         mutex_unlock(&capidev_list_lock);
 956
 957         return nonseekable_open(inode, file);
 958 }
 959
 960 static int capi_release(struct inode *inode, struct file *file)
 961 {
 962         struct capidev *cdev = file->private_data;
 963
 964         mutex_lock(&capidev_list_lock);
 965         list_del(&cdev->list);
 966         mutex_unlock(&capidev_list_lock);
 967
 968         if (cdev->ap.applid)
 969                 capi20_release(&cdev->ap);
 970         skb_queue_purge(&cdev->recvqueue);
 971         capincci_free(cdev, 0xffffffff);
 972
 973         kfree(cdev);
 974         return 0;
 975 }
 976
 977 static const struct file_operations capi_fops =
 978 {
 979         .owner          = THIS_MODULE,
 980         .llseek         = no_llseek,
 981         .read           = capi_read,
 982         .write          = capi_write,
 983         .poll           = capi_poll,
 984         .ioctl          = capi_ioctl,
 985         .open           = capi_open,
 986         .release        = capi_release,
 987 };
 988
 989 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 990 /* -------- tty_operations for capincci ----------------------------- */
 991
 992 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
 993 {
 994         struct capiminor *mp;
 995         unsigned long flags;
 996
 997         if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == NULL)
 998                 return -ENXIO;
 999         if (mp->nccip == NULL)
1000                 return -ENXIO;
1001
1002         tty->driver_data = (void *)mp;
1003
1004         spin_lock_irqsave(&workaround_lock, flags);
1005         if (atomic_read(&mp->ttyopencount) == 0)
1006                 mp->tty = tty;
1007         atomic_inc(&mp->ttyopencount);
1008 #ifdef _DEBUG_REFCOUNT
1009         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1010 #endif
1011         handle_minor_recv(mp);
1012         spin_unlock_irqrestore(&workaround_lock, flags);
1013         return 0;
1014 }
1015
1016 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1017 {
1018         struct capiminor *mp;
1019
1020         mp = (struct capiminor *)tty->driver_data;
1021         if (mp) {
1022                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1023 #ifdef _DEBUG_REFCOUNT
1024                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1025 #endif
1026                         tty->driver_data = NULL;
1027                         mp->tty = NULL;
1028                 }
1029 #ifdef _DEBUG_REFCOUNT
1030                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1031 #endif
1032                 if (mp->nccip == NULL)
1033                         capiminor_free(mp);
1034         }
1035
1036 #ifdef _DEBUG_REFCOUNT
1037         printk(KERN_DEBUG "capinc_tty_close\n");
1038 #endif
1039 }
1040
1041 static int capinc_tty_write(struct tty_struct * tty,
1042                             const unsigned char *buf, int count)
1043 {
1044         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1045         struct sk_buff *skb;
1046         unsigned long flags;
1047
1048 #ifdef _DEBUG_TTYFUNCS
1049         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1050 #endif
1051
1052         if (!mp || !mp->nccip) {
1053 #ifdef _DEBUG_TTYFUNCS
1054                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1055 #endif
1056                 return 0;
1057         }
1058
1059         spin_lock_irqsave(&workaround_lock, flags);
1060         skb = mp->ttyskb;
1061         if (skb) {
1062                 mp->ttyskb = NULL;
1063                 skb_queue_tail(&mp->outqueue, skb);
1064                 mp->outbytes += skb->len;
1065         }
1066
1067         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1068         if (!skb) {
1069                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1070                 spin_unlock_irqrestore(&workaround_lock, flags);
1071                 return -ENOMEM;
1072         }
1073
1074         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1075         memcpy(skb_put(skb, count), buf, count);
1076
1077         skb_queue_tail(&mp->outqueue, skb);
1078         mp->outbytes += skb->len;
1079         (void)handle_minor_send(mp);
1080         (void)handle_minor_recv(mp);
1081         spin_unlock_irqrestore(&workaround_lock, flags);
1082         return count;
1083 }
1084
1085 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1086 {
1087         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1088         struct sk_buff *skb;
1089         unsigned long flags;
1090         int ret = 1;
1091
1092 #ifdef _DEBUG_TTYFUNCS
1093         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1094 #endif
1095
1096         if (!mp || !mp->nccip) {
1097 #ifdef _DEBUG_TTYFUNCS
1098                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1099 #endif
1100                 return 0;
1101         }
1102
1103         spin_lock_irqsave(&workaround_lock, flags);
1104         skb = mp->ttyskb;
1105         if (skb) {
1106                 if (skb_tailroom(skb) > 0) {
1107                         *(skb_put(skb, 1)) = ch;
1108                         spin_unlock_irqrestore(&workaround_lock, flags);
1109                         return 1;
1110                 }
1111                 mp->ttyskb = NULL;
1112                 skb_queue_tail(&mp->outqueue, skb);
1113                 mp->outbytes += skb->len;
1114                 (void)handle_minor_send(mp);
1115         }
1116         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1117         if (skb) {
1118                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1119                 *(skb_put(skb, 1)) = ch;
1120                 mp->ttyskb = skb;
1121         } else {
1122                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1123                 ret = 0;
1124         }
1125         spin_unlock_irqrestore(&workaround_lock, flags);
1126         return ret;
1127 }
1128
1129 static void capinc_tty_flush_chars(struct tty_struct *tty)
1130 {
1131         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1132         struct sk_buff *skb;
1133         unsigned long flags;
1134
1135 #ifdef _DEBUG_TTYFUNCS
1136         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1137 #endif
1138
1139         if (!mp || !mp->nccip) {
1140 #ifdef _DEBUG_TTYFUNCS
1141                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1142 #endif
1143                 return;
1144         }
1145
1146         spin_lock_irqsave(&workaround_lock, flags);
1147         skb = mp->ttyskb;
1148         if (skb) {
1149                 mp->ttyskb = NULL;
1150                 skb_queue_tail(&mp->outqueue, skb);
1151                 mp->outbytes += skb->len;
1152                 (void)handle_minor_send(mp);
1153         }
1154         (void)handle_minor_recv(mp);
1155         spin_unlock_irqrestore(&workaround_lock, flags);
1156 }
1157
1158 static int capinc_tty_write_room(struct tty_struct *tty)
1159 {
1160         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1161         int room;
1162         if (!mp || !mp->nccip) {
1163 #ifdef _DEBUG_TTYFUNCS
1164                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1165 #endif
1166                 return 0;
1167         }
1168         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1169         room *= CAPI_MAX_BLKSIZE;
1170 #ifdef _DEBUG_TTYFUNCS
1171         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1172 #endif
1173         return room;
1174 }
1175
1176 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1177 {
1178         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1179         if (!mp || !mp->nccip) {
1180 #ifdef _DEBUG_TTYFUNCS
1181                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1182 #endif
1183                 return 0;
1184         }
1185 #ifdef _DEBUG_TTYFUNCS
1186         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1187                         mp->outbytes, mp->nack,
1188                         skb_queue_len(&mp->outqueue),
1189                         skb_queue_len(&mp->inqueue));
1190 #endif
1191         return mp->outbytes;
1192 }
1193
1194 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1195                     unsigned int cmd, unsigned long arg)
1196 {
1197         int error = 0;
1198         switch (cmd) {
1199         default:
1200                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1201                 break;
1202         }
1203         return error;
1204 }
1205
1206 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1207 {
1208 #ifdef _DEBUG_TTYFUNCS
1209         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1210 #endif
1211 }
1212
1213 static void capinc_tty_throttle(struct tty_struct * tty)
1214 {
1215         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1216 #ifdef _DEBUG_TTYFUNCS
1217         printk(KERN_DEBUG "capinc_tty_throttle\n");
1218 #endif
1219         if (mp)
1220                 mp->ttyinstop = 1;
1221 }
1222
1223 static void capinc_tty_unthrottle(struct tty_struct * tty)
1224 {
1225         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1226         unsigned long flags;
1227 #ifdef _DEBUG_TTYFUNCS
1228         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1229 #endif
1230         if (mp) {
1231                 spin_lock_irqsave(&workaround_lock, flags);
1232                 mp->ttyinstop = 0;
1233                 handle_minor_recv(mp);
1234                 spin_unlock_irqrestore(&workaround_lock, flags);
1235         }
1236 }
1237
1238 static void capinc_tty_stop(struct tty_struct *tty)
1239 {
1240         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1241 #ifdef _DEBUG_TTYFUNCS
1242         printk(KERN_DEBUG "capinc_tty_stop\n");
1243 #endif
1244         if (mp) {
1245                 mp->ttyoutstop = 1;
1246         }
1247 }
1248
1249 static void capinc_tty_start(struct tty_struct *tty)
1250 {
1251         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1252         unsigned long flags;
1253 #ifdef _DEBUG_TTYFUNCS
1254         printk(KERN_DEBUG "capinc_tty_start\n");
1255 #endif
1256         if (mp) {
1257                 spin_lock_irqsave(&workaround_lock, flags);
1258                 mp->ttyoutstop = 0;
1259                 (void)handle_minor_send(mp);
1260                 spin_unlock_irqrestore(&workaround_lock, flags);
1261         }
1262 }
1263
1264 static void capinc_tty_hangup(struct tty_struct *tty)
1265 {
1266 #ifdef _DEBUG_TTYFUNCS
1267         printk(KERN_DEBUG "capinc_tty_hangup\n");
1268 #endif
1269 }
1270
1271 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1272 {
1273 #ifdef _DEBUG_TTYFUNCS
1274         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1275 #endif
1276         return 0;
1277 }
1278
1279 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1280 {
1281 #ifdef _DEBUG_TTYFUNCS
1282         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1283 #endif
1284 }
1285
1286 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1287 {
1288 #ifdef _DEBUG_TTYFUNCS
1289         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1290 #endif
1291 }
1292
1293 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1294 {
1295 #ifdef _DEBUG_TTYFUNCS
1296         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1297 #endif
1298 }
1299
1300 static struct tty_driver *capinc_tty_driver;
1301
1302 static const struct tty_operations capinc_ops = {
1303         .open = capinc_tty_open,
1304         .close = capinc_tty_close,
1305         .write = capinc_tty_write,
1306         .put_char = capinc_tty_put_char,
1307         .flush_chars = capinc_tty_flush_chars,
1308         .write_room = capinc_tty_write_room,
1309         .chars_in_buffer = capinc_tty_chars_in_buffer,
1310         .ioctl = capinc_tty_ioctl,
1311         .set_termios = capinc_tty_set_termios,
1312         .throttle = capinc_tty_throttle,
1313         .unthrottle = capinc_tty_unthrottle,
1314         .stop = capinc_tty_stop,
1315         .start = capinc_tty_start,
1316         .hangup = capinc_tty_hangup,
1317         .break_ctl = capinc_tty_break_ctl,
1318         .flush_buffer = capinc_tty_flush_buffer,
1319         .set_ldisc = capinc_tty_set_ldisc,
1320         .send_xchar = capinc_tty_send_xchar,
1321 };
1322
1323 static int capinc_tty_init(void)
1324 {
1325         struct tty_driver *drv;
1326
1327         if (capi_ttyminors > CAPINC_MAX_PORTS)
1328                 capi_ttyminors = CAPINC_MAX_PORTS;
1329         if (capi_ttyminors <= 0)
1330                 capi_ttyminors = CAPINC_NR_PORTS;
1331
1332         drv = alloc_tty_driver(capi_ttyminors);
1333         if (!drv)
1334                 return -ENOMEM;
1335
1336         drv->owner = THIS_MODULE;
1337         drv->driver_name = "capi_nc";
1338         drv->name = "capi";
1339         drv->major = capi_ttymajor;
1340         drv->minor_start = 0;
1341         drv->type = TTY_DRIVER_TYPE_SERIAL;
1342         drv->subtype = SERIAL_TYPE_NORMAL;
1343         drv->init_termios = tty_std_termios;
1344         drv->init_termios.c_iflag = ICRNL;
1345         drv->init_termios.c_oflag = OPOST | ONLCR;
1346         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1347         drv->init_termios.c_lflag = 0;
1348         drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1349         tty_set_operations(drv, &capinc_ops);
1350         if (tty_register_driver(drv)) {
1351                 put_tty_driver(drv);
1352                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1353                 return -1;
1354         }
1355         capinc_tty_driver = drv;
1356         return 0;
1357 }
1358
1359 static void capinc_tty_exit(void)
1360 {
1361         struct tty_driver *drv = capinc_tty_driver;
1362         int retval;
1363         if ((retval = tty_unregister_driver(drv)))
1364                 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1365         put_tty_driver(drv);
1366 }
1367
1368 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1369
1370 static inline int capinc_tty_init(void)
1371 {
1372         return 0;
1373 }
1374
1375 static inline void capinc_tty_exit(void) { }
1376
1377 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1378
1379 /* -------- /proc functions ----------------------------------------- */
1380
1381 /*
1382  * /proc/capi/capi20:
1383  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1384  */
1385 static int capi20_proc_show(struct seq_file *m, void *v)
1386 {
1387         struct capidev *cdev;
1388         struct list_head *l;
1389
1390         mutex_lock(&capidev_list_lock);
1391         list_for_each(l, &capidev_list) {
1392                 cdev = list_entry(l, struct capidev, list);
1393                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1394                         cdev->ap.applid,
1395                         cdev->ap.nrecvctlpkt,
1396                         cdev->ap.nrecvdatapkt,
1397                         cdev->ap.nsentctlpkt,
1398                         cdev->ap.nsentdatapkt);
1399         }
1400         mutex_unlock(&capidev_list_lock);
1401         return 0;
1402 }
1403
1404 static int capi20_proc_open(struct inode *inode, struct file *file)
1405 {
1406         return single_open(file, capi20_proc_show, NULL);
1407 }
1408
1409 static const struct file_operations capi20_proc_fops = {
1410         .owner          = THIS_MODULE,
1411         .open           = capi20_proc_open,
1412         .read           = seq_read,
1413         .llseek         = seq_lseek,
1414         .release        = single_release,
1415 };
1416
1417 /*
1418  * /proc/capi/capi20ncci:
1419  *  applid ncci
1420  */
1421 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1422 {
1423         struct capidev *cdev;
1424         struct capincci *np;
1425
1426         mutex_lock(&capidev_list_lock);
1427         list_for_each_entry(cdev, &capidev_list, list) {
1428                 mutex_lock(&cdev->lock);
1429                 list_for_each_entry(np, &cdev->nccis, list)
1430                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1431                 mutex_unlock(&cdev->lock);
1432         }
1433         mutex_unlock(&capidev_list_lock);
1434         return 0;
1435 }
1436
1437 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1438 {
1439         return single_open(file, capi20ncci_proc_show, NULL);
1440 }
1441
1442 static const struct file_operations capi20ncci_proc_fops = {
1443         .owner          = THIS_MODULE,
1444         .open           = capi20ncci_proc_open,
1445         .read           = seq_read,
1446         .llseek         = seq_lseek,
1447         .release        = single_release,
1448 };
1449
1450 static void __init proc_init(void)
1451 {
1452         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1453         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1454 }
1455
1456 static void __exit proc_exit(void)
1457 {
1458         remove_proc_entry("capi/capi20", NULL);
1459         remove_proc_entry("capi/capi20ncci", NULL);
1460 }
1461
1462 /* -------- init function and module interface ---------------------- */
1463
1464
1465 static int __init capi_init(void)
1466 {
1467         const char *compileinfo;
1468         int major_ret;
1469
1470         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1471         if (major_ret < 0) {
1472                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1473                 return major_ret;
1474         }
1475         capi_class = class_create(THIS_MODULE, "capi");
1476         if (IS_ERR(capi_class)) {
1477                 unregister_chrdev(capi_major, "capi20");
1478                 return PTR_ERR(capi_class);
1479         }
1480
1481         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1482
1483         if (capinc_tty_init() < 0) {
1484                 device_destroy(capi_class, MKDEV(capi_major, 0));
1485                 class_destroy(capi_class);
1486                 unregister_chrdev(capi_major, "capi20");
1487                 return -ENOMEM;
1488         }
1489
1490         proc_init();
1491
1492 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1493         compileinfo = " (middleware+capifs)";
1494 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1495         compileinfo = " (no capifs)";
1496 #else
1497         compileinfo = " (no middleware)";
1498 #endif
1499         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1500                capi_major, compileinfo);
1501
1502         return 0;
1503 }
1504
1505 static void __exit capi_exit(void)
1506 {
1507         proc_exit();
1508
1509         device_destroy(capi_class, MKDEV(capi_major, 0));
1510         class_destroy(capi_class);
1511         unregister_chrdev(capi_major, "capi20");
1512
1513         capinc_tty_exit();
1514 }
1515
1516 module_init(capi_init);
1517 module_exit(capi_exit);