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/mm.h>
  22 #include <linux/smp_lock.h>
  23 #include <linux/timer.h>
  24 #include <linux/wait.h>
  25 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  26 #include <linux/tty.h>
  27 #ifdef CONFIG_PPP
  28 #include <linux/netdevice.h>
  29 #include <linux/ppp_defs.h>
  30 #include <linux/if_ppp.h>
  31 #endif /* CONFIG_PPP */
  32 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  33 #include <linux/skbuff.h>
  34 #include <linux/proc_fs.h>
  35 #include <linux/poll.h>
  36 #include <linux/capi.h>
  37 #include <linux/kernelcapi.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/moduleparam.h>
  41 #include <linux/isdn/capiutil.h>
  42 #include <linux/isdn/capicmd.h>
  43 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
  44 #include "capifs.h"
  45 #endif
  46
  47 static char *revision = "$Revision: 1.1.2.7 $";
  48
  49 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  50 MODULE_AUTHOR("Carsten Paeth");
  51 MODULE_LICENSE("GPL");
  52
  53 #undef _DEBUG_REFCOUNT          /* alloc/free and open/close debug */
  54 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  55 #undef _DEBUG_DATAFLOW          /* data flow */
  56
  57 /* -------- driver information -------------------------------------- */
  58
  59 static struct class *capi_class;
  60
  61 static int capi_major = 68;             /* allocated */
  62 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  63 #define CAPINC_NR_PORTS 32
  64 #define CAPINC_MAX_PORTS        256
  65 static int capi_ttymajor = 191;
  66 static int capi_ttyminors = CAPINC_NR_PORTS;
  67 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  68
  69 module_param_named(major, capi_major, uint, 0);
  70 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  71 module_param_named(ttymajor, capi_ttymajor, uint, 0);
  72 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  73 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  74
  75 /* -------- defines ------------------------------------------------- */
  76
  77 #define CAPINC_MAX_RECVQUEUE    10
  78 #define CAPINC_MAX_SENDQUEUE    10
  79 #define CAPI_MAX_BLKSIZE        2048
  80
  81 /* -------- data structures ----------------------------------------- */
  82
  83 struct capidev;
  84 struct capincci;
  85 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  86 struct capiminor;
  87
  88 struct datahandle_queue {
  89         struct list_head        list;
  90         u16                     datahandle;
  91 };
  92
  93 struct capiminor {
  94         struct list_head list;
  95         struct capincci  *nccip;
  96         unsigned int      minor;
  97
  98         struct capi20_appl *ap;
  99         u32              ncci;
 100         u16              datahandle;
 101         u16              msgid;
 102
 103         struct tty_struct *tty;
 104         int                ttyinstop;
 105         int                ttyoutstop;
 106         struct sk_buff    *ttyskb;
 107         atomic_t           ttyopencount;
 108
 109         struct sk_buff_head inqueue;
 110         int                 inbytes;
 111         struct sk_buff_head outqueue;
 112         int                 outbytes;
 113
 114         /* transmit path */
 115         struct list_head ackqueue;
 116         int nack;
 117         spinlock_t ackqlock;
 118 };
 119 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 120
 121 /* FIXME: The following lock is a sledgehammer-workaround to a
 122  * locking issue with the capiminor (and maybe other) data structure(s).
 123  * Access to this data is done in a racy way and crashes the machine with
 124  * a FritzCard DSL driver; sooner or later. This is a workaround
 125  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 126  * The correct (and scalable) fix for the issue seems to require
 127  * an API change to the drivers... . */
 128 static DEFINE_SPINLOCK(workaround_lock);
 129
 130 struct capincci {
 131         struct capincci *next;
 132         u32              ncci;
 133         struct capidev  *cdev;
 134 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 135         struct capiminor *minorp;
 136 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 137 };
 138
 139 struct capidev {
 140         struct list_head list;
 141         struct capi20_appl ap;
 142         u16             errcode;
 143         unsigned        userflags;
 144
 145         struct sk_buff_head recvqueue;
 146         wait_queue_head_t recvwait;
 147
 148         struct capincci *nccis;
 149
 150         struct semaphore ncci_list_sem;
 151 };
 152
 153 /* -------- global variables ---------------------------------------- */
 154
 155 static DEFINE_RWLOCK(capidev_list_lock);
 156 static LIST_HEAD(capidev_list);
 157
 158 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 159 static DEFINE_RWLOCK(capiminor_list_lock);
 160 static LIST_HEAD(capiminor_list);
 161 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 162
 163 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 164 /* -------- datahandles --------------------------------------------- */
 165
 166 static int capincci_add_ack(struct capiminor *mp, u16 datahandle)
 167 {
 168         struct datahandle_queue *n;
 169         unsigned long flags;
 170
 171         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 172         if (unlikely(!n)) {
 173                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 174                 return -1;
 175         }
 176         n->datahandle = datahandle;
 177         INIT_LIST_HEAD(&n->list);
 178         spin_lock_irqsave(&mp->ackqlock, flags);
 179         list_add_tail(&n->list, &mp->ackqueue);
 180         mp->nack++;
 181         spin_unlock_irqrestore(&mp->ackqlock, flags);
 182         return 0;
 183 }
 184
 185 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 186 {
 187         struct datahandle_queue *p, *tmp;
 188         unsigned long flags;
 189
 190         spin_lock_irqsave(&mp->ackqlock, flags);
 191         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 192                 if (p->datahandle == datahandle) {
 193                         list_del(&p->list);
 194                         kfree(p);
 195                         mp->nack--;
 196                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 197                         return 0;
 198                 }
 199         }
 200         spin_unlock_irqrestore(&mp->ackqlock, flags);
 201         return -1;
 202 }
 203
 204 static void capiminor_del_all_ack(struct capiminor *mp)
 205 {
 206         struct datahandle_queue *p, *tmp;
 207         unsigned long flags;
 208
 209         spin_lock_irqsave(&mp->ackqlock, flags);
 210         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 211                 list_del(&p->list);
 212                 kfree(p);
 213                 mp->nack--;
 214         }
 215         spin_unlock_irqrestore(&mp->ackqlock, flags);
 216 }
 217
 218
 219 /* -------- struct capiminor ---------------------------------------- */
 220
 221 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 222 {
 223         struct capiminor *mp, *p;
 224         unsigned int minor = 0;
 225         unsigned long flags;
 226
 227         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 228         if (!mp) {
 229                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 230                 return NULL;
 231         }
 232
 233         mp->ap = ap;
 234         mp->ncci = ncci;
 235         mp->msgid = 0;
 236         atomic_set(&mp->ttyopencount,0);
 237         INIT_LIST_HEAD(&mp->ackqueue);
 238         spin_lock_init(&mp->ackqlock);
 239
 240         skb_queue_head_init(&mp->inqueue);
 241         skb_queue_head_init(&mp->outqueue);
 242
 243         /* Allocate the least unused minor number.
 244          */
 245         write_lock_irqsave(&capiminor_list_lock, flags);
 246         if (list_empty(&capiminor_list))
 247                 list_add(&mp->list, &capiminor_list);
 248         else {
 249                 list_for_each_entry(p, &capiminor_list, list) {
 250                         if (p->minor > minor)
 251                                 break;
 252                         minor++;
 253                 }
 254
 255                 if (minor < capi_ttyminors) {
 256                         mp->minor = minor;
 257                         list_add(&mp->list, p->list.prev);
 258                 }
 259         }
 260                 write_unlock_irqrestore(&capiminor_list_lock, flags);
 261
 262         if (!(minor < capi_ttyminors)) {
 263                 printk(KERN_NOTICE "capi: out of minors\n");
 264                         kfree(mp);
 265                 return NULL;
 266         }
 267
 268         return mp;
 269 }
 270
 271 static void capiminor_free(struct capiminor *mp)
 272 {
 273         unsigned long flags;
 274
 275         write_lock_irqsave(&capiminor_list_lock, flags);
 276         list_del(&mp->list);
 277         write_unlock_irqrestore(&capiminor_list_lock, flags);
 278
 279         if (mp->ttyskb) kfree_skb(mp->ttyskb);
 280         mp->ttyskb = NULL;
 281         skb_queue_purge(&mp->inqueue);
 282         skb_queue_purge(&mp->outqueue);
 283         capiminor_del_all_ack(mp);
 284         kfree(mp);
 285 }
 286
 287 static struct capiminor *capiminor_find(unsigned int minor)
 288 {
 289         struct list_head *l;
 290         struct capiminor *p = NULL;
 291
 292         read_lock(&capiminor_list_lock);
 293         list_for_each(l, &capiminor_list) {
 294                 p = list_entry(l, struct capiminor, list);
 295                 if (p->minor == minor)
 296                         break;
 297         }
 298         read_unlock(&capiminor_list_lock);
 299         if (l == &capiminor_list)
 300                 return NULL;
 301
 302         return p;
 303 }
 304 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 305
 306 /* -------- struct capincci ----------------------------------------- */
 307
 308 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 309 {
 310         struct capincci *np, **pp;
 311 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 312         struct capiminor *mp = NULL;
 313 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 314
 315         np = kzalloc(sizeof(*np), GFP_ATOMIC);
 316         if (!np)
 317                 return NULL;
 318         np->ncci = ncci;
 319         np->cdev = cdev;
 320 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 321         mp = NULL;
 322         if (cdev->userflags & CAPIFLAG_HIGHJACKING)
 323                 mp = np->minorp = capiminor_alloc(&cdev->ap, ncci);
 324         if (mp) {
 325                 mp->nccip = np;
 326 #ifdef _DEBUG_REFCOUNT
 327                 printk(KERN_DEBUG "set mp->nccip\n");
 328 #endif
 329 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
 330                 capifs_new_ncci(mp->minor, MKDEV(capi_ttymajor, mp->minor));
 331 #endif
 332         }
 333 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 334         for (pp=&cdev->nccis; *pp; pp = &(*pp)->next)
 335                 ;
 336         *pp = np;
 337         return np;
 338 }
 339
 340 static void capincci_free(struct capidev *cdev, u32 ncci)
 341 {
 342         struct capincci *np, **pp;
 343 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 344         struct capiminor *mp;
 345 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 346
 347         pp=&cdev->nccis;
 348         while (*pp) {
 349                 np = *pp;
 350                 if (ncci == 0xffffffff || np->ncci == ncci) {
 351                         *pp = (*pp)->next;
 352 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 353                         if ((mp = np->minorp) != 0) {
 354 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
 355                                 capifs_free_ncci(mp->minor);
 356 #endif
 357                                 if (mp->tty) {
 358                                         mp->nccip = NULL;
 359 #ifdef _DEBUG_REFCOUNT
 360                                         printk(KERN_DEBUG "reset mp->nccip\n");
 361 #endif
 362                                         tty_hangup(mp->tty);
 363                                 } else {
 364                                         capiminor_free(mp);
 365                                 }
 366                         }
 367 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 368                         kfree(np);
 369                         if (*pp == 0) return;
 370                 } else {
 371                         pp = &(*pp)->next;
 372                 }
 373         }
 374 }
 375
 376 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 377 {
 378         struct capincci *p;
 379
 380         for (p=cdev->nccis; p ; p = p->next) {
 381                 if (p->ncci == ncci)
 382                         break;
 383         }
 384         return p;
 385 }
 386
 387 /* -------- struct capidev ------------------------------------------ */
 388
 389 static struct capidev *capidev_alloc(void)
 390 {
 391         struct capidev *cdev;
 392         unsigned long flags;
 393
 394         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 395         if (!cdev)
 396                 return NULL;
 397
 398         init_MUTEX(&cdev->ncci_list_sem);
 399         skb_queue_head_init(&cdev->recvqueue);
 400         init_waitqueue_head(&cdev->recvwait);
 401         write_lock_irqsave(&capidev_list_lock, flags);
 402         list_add_tail(&cdev->list, &capidev_list);
 403         write_unlock_irqrestore(&capidev_list_lock, flags);
 404         return cdev;
 405 }
 406
 407 static void capidev_free(struct capidev *cdev)
 408 {
 409         unsigned long flags;
 410
 411         if (cdev->ap.applid) {
 412                 capi20_release(&cdev->ap);
 413                 cdev->ap.applid = 0;
 414         }
 415         skb_queue_purge(&cdev->recvqueue);
 416
 417         down(&cdev->ncci_list_sem);
 418         capincci_free(cdev, 0xffffffff);
 419         up(&cdev->ncci_list_sem);
 420
 421         write_lock_irqsave(&capidev_list_lock, flags);
 422         list_del(&cdev->list);
 423         write_unlock_irqrestore(&capidev_list_lock, flags);
 424         kfree(cdev);
 425 }
 426
 427 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 428 /* -------- handle data queue --------------------------------------- */
 429
 430 static struct sk_buff *
 431 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 432 {
 433         struct sk_buff *nskb;
 434         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 435         if (nskb) {
 436                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 437                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 438                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 439                 capimsg_setu16(s, 2, mp->ap->applid);
 440                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 441                 capimsg_setu8 (s, 5, CAPI_RESP);
 442                 capimsg_setu16(s, 6, mp->msgid++);
 443                 capimsg_setu32(s, 8, mp->ncci);
 444                 capimsg_setu16(s, 12, datahandle);
 445         }
 446         return nskb;
 447 }
 448
 449 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 450 {
 451         struct sk_buff *nskb;
 452         int datalen;
 453         u16 errcode, datahandle;
 454         struct tty_ldisc *ld;
 455
 456         datalen = skb->len - CAPIMSG_LEN(skb->data);
 457         if (mp->tty == NULL)
 458         {
 459 #ifdef _DEBUG_DATAFLOW
 460                 printk(KERN_DEBUG "capi: currently no receiver\n");
 461 #endif
 462                 return -1;
 463         }
 464
 465         ld = tty_ldisc_ref(mp->tty);
 466         if (ld == NULL)
 467                 return -1;
 468         if (ld->receive_buf == NULL) {
 469 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 470                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 471 #endif
 472                 goto bad;
 473         }
 474         if (mp->ttyinstop) {
 475 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 476                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 477 #endif
 478                 goto bad;
 479         }
 480         if (mp->tty->receive_room < datalen) {
 481 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 482                 printk(KERN_DEBUG "capi: no room in tty\n");
 483 #endif
 484                 goto bad;
 485         }
 486         if ((nskb = gen_data_b3_resp_for(mp, skb)) == 0) {
 487                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 488                 goto bad;
 489         }
 490         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 491         errcode = capi20_put_message(mp->ap, nskb);
 492         if (errcode != CAPI_NOERROR) {
 493                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 494                                 errcode);
 495                 kfree_skb(nskb);
 496                 goto bad;
 497         }
 498         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 499 #ifdef _DEBUG_DATAFLOW
 500         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 501                                 datahandle, skb->len);
 502 #endif
 503         ld->receive_buf(mp->tty, skb->data, NULL, skb->len);
 504         kfree_skb(skb);
 505         tty_ldisc_deref(ld);
 506         return 0;
 507 bad:
 508         tty_ldisc_deref(ld);
 509         return -1;
 510 }
 511
 512 static void handle_minor_recv(struct capiminor *mp)
 513 {
 514         struct sk_buff *skb;
 515         while ((skb = skb_dequeue(&mp->inqueue)) != 0) {
 516                 unsigned int len = skb->len;
 517                 mp->inbytes -= len;
 518                 if (handle_recv_skb(mp, skb) < 0) {
 519                         skb_queue_head(&mp->inqueue, skb);
 520                         mp->inbytes += len;
 521                         return;
 522                 }
 523         }
 524 }
 525
 526 static int handle_minor_send(struct capiminor *mp)
 527 {
 528         struct sk_buff *skb;
 529         u16 len;
 530         int count = 0;
 531         u16 errcode;
 532         u16 datahandle;
 533
 534         if (mp->tty && mp->ttyoutstop) {
 535 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 536                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 537 #endif
 538                 return 0;
 539         }
 540
 541         while ((skb = skb_dequeue(&mp->outqueue)) != 0) {
 542                 datahandle = mp->datahandle;
 543                 len = (u16)skb->len;
 544                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 545                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 546                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 547                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 548                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 549                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 550                 capimsg_setu16(skb->data, 6, mp->msgid++);
 551                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 552                 capimsg_setu32(skb->data, 12, (u32) skb->data); /* Data32 */
 553                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 554                 capimsg_setu16(skb->data, 18, datahandle);
 555                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 556
 557                 if (capincci_add_ack(mp, datahandle) < 0) {
 558                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 559                         skb_queue_head(&mp->outqueue, skb);
 560                         return count;
 561                 }
 562                 errcode = capi20_put_message(mp->ap, skb);
 563                 if (errcode == CAPI_NOERROR) {
 564                         mp->datahandle++;
 565                         count++;
 566                         mp->outbytes -= len;
 567 #ifdef _DEBUG_DATAFLOW
 568                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 569                                                         datahandle, len);
 570 #endif
 571                         continue;
 572                 }
 573                 capiminor_del_ack(mp, datahandle);
 574
 575                 if (errcode == CAPI_SENDQUEUEFULL) {
 576                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 577                         skb_queue_head(&mp->outqueue, skb);
 578                         break;
 579                 }
 580
 581                 /* ups, drop packet */
 582                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 583                 mp->outbytes -= len;
 584                 kfree_skb(skb);
 585         }
 586         return count;
 587 }
 588
 589 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 590 /* -------- function called by lower level -------------------------- */
 591
 592 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 593 {
 594         struct capidev *cdev = ap->private;
 595 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 596         struct capiminor *mp;
 597         u16 datahandle;
 598 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 599         struct capincci *np;
 600         u32 ncci;
 601         unsigned long flags;
 602
 603         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 604                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 605                 if (info == 0) {
 606                         down(&cdev->ncci_list_sem);
 607                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 608                         up(&cdev->ncci_list_sem);
 609                 }
 610         }
 611         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
 612                 down(&cdev->ncci_list_sem);
 613                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 614                 up(&cdev->ncci_list_sem);
 615         }
 616         spin_lock_irqsave(&workaround_lock, flags);
 617         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 618                 skb_queue_tail(&cdev->recvqueue, skb);
 619                 wake_up_interruptible(&cdev->recvwait);
 620                 spin_unlock_irqrestore(&workaround_lock, flags);
 621                 return;
 622         }
 623         ncci = CAPIMSG_CONTROL(skb->data);
 624         for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
 625                 ;
 626         if (!np) {
 627                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 628                 skb_queue_tail(&cdev->recvqueue, skb);
 629                 wake_up_interruptible(&cdev->recvwait);
 630                 spin_unlock_irqrestore(&workaround_lock, flags);
 631                 return;
 632         }
 633 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 634         skb_queue_tail(&cdev->recvqueue, skb);
 635         wake_up_interruptible(&cdev->recvwait);
 636 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 637         mp = np->minorp;
 638         if (!mp) {
 639                 skb_queue_tail(&cdev->recvqueue, skb);
 640                 wake_up_interruptible(&cdev->recvwait);
 641                 spin_unlock_irqrestore(&workaround_lock, flags);
 642                 return;
 643         }
 644
 645
 646         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 647
 648                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 649 #ifdef _DEBUG_DATAFLOW
 650                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 651                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 652 #endif
 653                 skb_queue_tail(&mp->inqueue, skb);
 654                 mp->inbytes += skb->len;
 655                 handle_minor_recv(mp);
 656
 657         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 658
 659                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 660 #ifdef _DEBUG_DATAFLOW
 661                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 662                                 datahandle,
 663                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 664 #endif
 665                 kfree_skb(skb);
 666                 (void)capiminor_del_ack(mp, datahandle);
 667                 if (mp->tty)
 668                         tty_wakeup(mp->tty);
 669                 (void)handle_minor_send(mp);
 670
 671         } else {
 672                 /* ups, let capi application handle it :-) */
 673                 skb_queue_tail(&cdev->recvqueue, skb);
 674                 wake_up_interruptible(&cdev->recvwait);
 675         }
 676 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 677         spin_unlock_irqrestore(&workaround_lock, flags);
 678 }
 679
 680 /* -------- file_operations for capidev ----------------------------- */
 681
 682 static ssize_t
 683 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 684 {
 685         struct capidev *cdev = (struct capidev *)file->private_data;
 686         struct sk_buff *skb;
 687         size_t copied;
 688
 689         if (!cdev->ap.applid)
 690                 return -ENODEV;
 691
 692         if ((skb = skb_dequeue(&cdev->recvqueue)) == 0) {
 693
 694                 if (file->f_flags & O_NONBLOCK)
 695                         return -EAGAIN;
 696
 697                 for (;;) {
 698                         interruptible_sleep_on(&cdev->recvwait);
 699                         if ((skb = skb_dequeue(&cdev->recvqueue)) != 0)
 700                                 break;
 701                         if (signal_pending(current))
 702                                 break;
 703                 }
 704                 if (skb == 0)
 705                         return -ERESTARTNOHAND;
 706         }
 707         if (skb->len > count) {
 708                 skb_queue_head(&cdev->recvqueue, skb);
 709                 return -EMSGSIZE;
 710         }
 711         if (copy_to_user(buf, skb->data, skb->len)) {
 712                 skb_queue_head(&cdev->recvqueue, skb);
 713                 return -EFAULT;
 714         }
 715         copied = skb->len;
 716
 717         kfree_skb(skb);
 718
 719         return copied;
 720 }
 721
 722 static ssize_t
 723 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 724 {
 725         struct capidev *cdev = (struct capidev *)file->private_data;
 726         struct sk_buff *skb;
 727         u16 mlen;
 728
 729         if (!cdev->ap.applid)
 730                 return -ENODEV;
 731
 732         skb = alloc_skb(count, GFP_USER);
 733         if (!skb)
 734                 return -ENOMEM;
 735
 736         if (copy_from_user(skb_put(skb, count), buf, count)) {
 737                 kfree_skb(skb);
 738                 return -EFAULT;
 739         }
 740         mlen = CAPIMSG_LEN(skb->data);
 741         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 742                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 743                         kfree_skb(skb);
 744                         return -EINVAL;
 745                 }
 746         } else {
 747                 if (mlen != count) {
 748                         kfree_skb(skb);
 749                         return -EINVAL;
 750                 }
 751         }
 752         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 753
 754         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 755                 down(&cdev->ncci_list_sem);
 756                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 757                 up(&cdev->ncci_list_sem);
 758         }
 759
 760         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 761
 762         if (cdev->errcode) {
 763                 kfree_skb(skb);
 764                 return -EIO;
 765         }
 766         return count;
 767 }
 768
 769 static unsigned int
 770 capi_poll(struct file *file, poll_table * wait)
 771 {
 772         struct capidev *cdev = (struct capidev *)file->private_data;
 773         unsigned int mask = 0;
 774
 775         if (!cdev->ap.applid)
 776                 return POLLERR;
 777
 778         poll_wait(file, &(cdev->recvwait), wait);
 779         mask = POLLOUT | POLLWRNORM;
 780         if (!skb_queue_empty(&cdev->recvqueue))
 781                 mask |= POLLIN | POLLRDNORM;
 782         return mask;
 783 }
 784
 785 static int
 786 capi_ioctl(struct inode *inode, struct file *file,
 787            unsigned int cmd, unsigned long arg)
 788 {
 789         struct capidev *cdev = file->private_data;
 790         struct capi20_appl *ap = &cdev->ap;
 791         capi_ioctl_struct data;
 792         int retval = -EINVAL;
 793         void __user *argp = (void __user *)arg;
 794
 795         switch (cmd) {
 796         case CAPI_REGISTER:
 797                 {
 798                         if (ap->applid)
 799                                 return -EEXIST;
 800
 801                         if (copy_from_user(&cdev->ap.rparam, argp,
 802                                            sizeof(struct capi_register_params)))
 803                                 return -EFAULT;
 804
 805                         cdev->ap.private = cdev;
 806                         cdev->ap.recv_message = capi_recv_message;
 807                         cdev->errcode = capi20_register(ap);
 808                         if (cdev->errcode) {
 809                                 ap->applid = 0;
 810                                 return -EIO;
 811                         }
 812                 }
 813                 return (int)ap->applid;
 814
 815         case CAPI_GET_VERSION:
 816                 {
 817                         if (copy_from_user(&data.contr, argp,
 818                                                 sizeof(data.contr)))
 819                                 return -EFAULT;
 820                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 821                         if (cdev->errcode)
 822                                 return -EIO;
 823                         if (copy_to_user(argp, &data.version,
 824                                          sizeof(data.version)))
 825                                 return -EFAULT;
 826                 }
 827                 return 0;
 828
 829         case CAPI_GET_SERIAL:
 830                 {
 831                         if (copy_from_user(&data.contr, argp,
 832                                            sizeof(data.contr)))
 833                                 return -EFAULT;
 834                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 835                         if (cdev->errcode)
 836                                 return -EIO;
 837                         if (copy_to_user(argp, data.serial,
 838                                          sizeof(data.serial)))
 839                                 return -EFAULT;
 840                 }
 841                 return 0;
 842         case CAPI_GET_PROFILE:
 843                 {
 844                         if (copy_from_user(&data.contr, argp,
 845                                            sizeof(data.contr)))
 846                                 return -EFAULT;
 847
 848                         if (data.contr == 0) {
 849                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 850                                 if (cdev->errcode)
 851                                         return -EIO;
 852
 853                                 retval = copy_to_user(argp,
 854                                       &data.profile.ncontroller,
 855                                        sizeof(data.profile.ncontroller));
 856
 857                         } else {
 858                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 859                                 if (cdev->errcode)
 860                                         return -EIO;
 861
 862                                 retval = copy_to_user(argp, &data.profile,
 863                                                    sizeof(data.profile));
 864                         }
 865                         if (retval)
 866                                 return -EFAULT;
 867                 }
 868                 return 0;
 869
 870         case CAPI_GET_MANUFACTURER:
 871                 {
 872                         if (copy_from_user(&data.contr, argp,
 873                                            sizeof(data.contr)))
 874                                 return -EFAULT;
 875                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 876                         if (cdev->errcode)
 877                                 return -EIO;
 878
 879                         if (copy_to_user(argp, data.manufacturer,
 880                                          sizeof(data.manufacturer)))
 881                                 return -EFAULT;
 882
 883                 }
 884                 return 0;
 885         case CAPI_GET_ERRCODE:
 886                 data.errcode = cdev->errcode;
 887                 cdev->errcode = CAPI_NOERROR;
 888                 if (arg) {
 889                         if (copy_to_user(argp, &data.errcode,
 890                                          sizeof(data.errcode)))
 891                                 return -EFAULT;
 892                 }
 893                 return data.errcode;
 894
 895         case CAPI_INSTALLED:
 896                 if (capi20_isinstalled() == CAPI_NOERROR)
 897                         return 0;
 898                 return -ENXIO;
 899
 900         case CAPI_MANUFACTURER_CMD:
 901                 {
 902                         struct capi_manufacturer_cmd mcmd;
 903                         if (!capable(CAP_SYS_ADMIN))
 904                                 return -EPERM;
 905                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 906                                 return -EFAULT;
 907                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 908                 }
 909                 return 0;
 910
 911         case CAPI_SET_FLAGS:
 912         case CAPI_CLR_FLAGS:
 913                 {
 914                         unsigned userflags;
 915                         if (copy_from_user(&userflags, argp,
 916                                            sizeof(userflags)))
 917                                 return -EFAULT;
 918                         if (cmd == CAPI_SET_FLAGS)
 919                                 cdev->userflags |= userflags;
 920                         else
 921                                 cdev->userflags &= ~userflags;
 922                 }
 923                 return 0;
 924
 925         case CAPI_GET_FLAGS:
 926                 if (copy_to_user(argp, &cdev->userflags,
 927                                  sizeof(cdev->userflags)))
 928                         return -EFAULT;
 929                 return 0;
 930
 931         case CAPI_NCCI_OPENCOUNT:
 932                 {
 933                         struct capincci *nccip;
 934 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 935                         struct capiminor *mp;
 936 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 937                         unsigned ncci;
 938                         int count = 0;
 939                         if (copy_from_user(&ncci, argp, sizeof(ncci)))
 940                                 return -EFAULT;
 941
 942                         down(&cdev->ncci_list_sem);
 943                         if ((nccip = capincci_find(cdev, (u32) ncci)) == 0) {
 944                                 up(&cdev->ncci_list_sem);
 945                                 return 0;
 946                         }
 947 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 948                         if ((mp = nccip->minorp) != 0) {
 949                                 count += atomic_read(&mp->ttyopencount);
 950                         }
 951 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 952                         up(&cdev->ncci_list_sem);
 953                         return count;
 954                 }
 955                 return 0;
 956
 957 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 958         case CAPI_NCCI_GETUNIT:
 959                 {
 960                         struct capincci *nccip;
 961                         struct capiminor *mp;
 962                         unsigned ncci;
 963                         int unit = 0;
 964                         if (copy_from_user(&ncci, argp,
 965                                            sizeof(ncci)))
 966                                 return -EFAULT;
 967                         down(&cdev->ncci_list_sem);
 968                         nccip = capincci_find(cdev, (u32) ncci);
 969                         if (!nccip || (mp = nccip->minorp) == 0) {
 970                                 up(&cdev->ncci_list_sem);
 971                                 return -ESRCH;
 972                         }
 973                         unit = mp->minor;
 974                         up(&cdev->ncci_list_sem);
 975                         return unit;
 976                 }
 977                 return 0;
 978 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 979         }
 980         return -EINVAL;
 981 }
 982
 983 static int
 984 capi_open(struct inode *inode, struct file *file)
 985 {
 986         if (file->private_data)
 987                 return -EEXIST;
 988
 989         if ((file->private_data = capidev_alloc()) == 0)
 990                 return -ENOMEM;
 991
 992         return nonseekable_open(inode, file);
 993 }
 994
 995 static int
 996 capi_release(struct inode *inode, struct file *file)
 997 {
 998         struct capidev *cdev = (struct capidev *)file->private_data;
 999
1000         capidev_free(cdev);
1001         file->private_data = NULL;
1002
1003         return 0;
1004 }
1005
1006 static const struct file_operations capi_fops =
1007 {
1008         .owner          = THIS_MODULE,
1009         .llseek         = no_llseek,
1010         .read           = capi_read,
1011         .write          = capi_write,
1012         .poll           = capi_poll,
1013         .ioctl          = capi_ioctl,
1014         .open           = capi_open,
1015         .release        = capi_release,
1016 };
1017
1018 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1019 /* -------- tty_operations for capincci ----------------------------- */
1020
1021 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
1022 {
1023         struct capiminor *mp;
1024         unsigned long flags;
1025
1026         if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == 0)
1027                 return -ENXIO;
1028         if (mp->nccip == 0)
1029                 return -ENXIO;
1030
1031         tty->driver_data = (void *)mp;
1032
1033         spin_lock_irqsave(&workaround_lock, flags);
1034         if (atomic_read(&mp->ttyopencount) == 0)
1035                 mp->tty = tty;
1036         atomic_inc(&mp->ttyopencount);
1037 #ifdef _DEBUG_REFCOUNT
1038         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1039 #endif
1040         handle_minor_recv(mp);
1041         spin_unlock_irqrestore(&workaround_lock, flags);
1042         return 0;
1043 }
1044
1045 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1046 {
1047         struct capiminor *mp;
1048
1049         mp = (struct capiminor *)tty->driver_data;
1050         if (mp) {
1051                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1052 #ifdef _DEBUG_REFCOUNT
1053                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1054 #endif
1055                         tty->driver_data = NULL;
1056                         mp->tty = NULL;
1057                 }
1058 #ifdef _DEBUG_REFCOUNT
1059                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1060 #endif
1061                 if (mp->nccip == 0)
1062                         capiminor_free(mp);
1063         }
1064
1065 #ifdef _DEBUG_REFCOUNT
1066         printk(KERN_DEBUG "capinc_tty_close\n");
1067 #endif
1068 }
1069
1070 static int capinc_tty_write(struct tty_struct * tty,
1071                             const unsigned char *buf, int count)
1072 {
1073         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1074         struct sk_buff *skb;
1075         unsigned long flags;
1076
1077 #ifdef _DEBUG_TTYFUNCS
1078         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1079 #endif
1080
1081         if (!mp || !mp->nccip) {
1082 #ifdef _DEBUG_TTYFUNCS
1083                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1084 #endif
1085                 return 0;
1086         }
1087
1088         spin_lock_irqsave(&workaround_lock, flags);
1089         skb = mp->ttyskb;
1090         if (skb) {
1091                 mp->ttyskb = NULL;
1092                 skb_queue_tail(&mp->outqueue, skb);
1093                 mp->outbytes += skb->len;
1094         }
1095
1096         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1097         if (!skb) {
1098                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1099                 spin_unlock_irqrestore(&workaround_lock, flags);
1100                 return -ENOMEM;
1101         }
1102
1103         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1104         memcpy(skb_put(skb, count), buf, count);
1105
1106         skb_queue_tail(&mp->outqueue, skb);
1107         mp->outbytes += skb->len;
1108         (void)handle_minor_send(mp);
1109         (void)handle_minor_recv(mp);
1110         spin_unlock_irqrestore(&workaround_lock, flags);
1111         return count;
1112 }
1113
1114 static void capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1115 {
1116         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1117         struct sk_buff *skb;
1118         unsigned long flags;
1119
1120 #ifdef _DEBUG_TTYFUNCS
1121         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1122 #endif
1123
1124         if (!mp || !mp->nccip) {
1125 #ifdef _DEBUG_TTYFUNCS
1126                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1127 #endif
1128                 return;
1129         }
1130
1131         spin_lock_irqsave(&workaround_lock, flags);
1132         skb = mp->ttyskb;
1133         if (skb) {
1134                 if (skb_tailroom(skb) > 0) {
1135                         *(skb_put(skb, 1)) = ch;
1136                         spin_unlock_irqrestore(&workaround_lock, flags);
1137                         return;
1138                 }
1139                 mp->ttyskb = NULL;
1140                 skb_queue_tail(&mp->outqueue, skb);
1141                 mp->outbytes += skb->len;
1142                 (void)handle_minor_send(mp);
1143         }
1144         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1145         if (skb) {
1146                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1147                 *(skb_put(skb, 1)) = ch;
1148                 mp->ttyskb = skb;
1149         } else {
1150                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1151         }
1152         spin_unlock_irqrestore(&workaround_lock, flags);
1153 }
1154
1155 static void capinc_tty_flush_chars(struct tty_struct *tty)
1156 {
1157         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1158         struct sk_buff *skb;
1159         unsigned long flags;
1160
1161 #ifdef _DEBUG_TTYFUNCS
1162         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1163 #endif
1164
1165         if (!mp || !mp->nccip) {
1166 #ifdef _DEBUG_TTYFUNCS
1167                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1168 #endif
1169                 return;
1170         }
1171
1172         spin_lock_irqsave(&workaround_lock, flags);
1173         skb = mp->ttyskb;
1174         if (skb) {
1175                 mp->ttyskb = NULL;
1176                 skb_queue_tail(&mp->outqueue, skb);
1177                 mp->outbytes += skb->len;
1178                 (void)handle_minor_send(mp);
1179         }
1180         (void)handle_minor_recv(mp);
1181         spin_unlock_irqrestore(&workaround_lock, flags);
1182 }
1183
1184 static int capinc_tty_write_room(struct tty_struct *tty)
1185 {
1186         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1187         int room;
1188         if (!mp || !mp->nccip) {
1189 #ifdef _DEBUG_TTYFUNCS
1190                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1191 #endif
1192                 return 0;
1193         }
1194         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1195         room *= CAPI_MAX_BLKSIZE;
1196 #ifdef _DEBUG_TTYFUNCS
1197         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1198 #endif
1199         return room;
1200 }
1201
1202 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1203 {
1204         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1205         if (!mp || !mp->nccip) {
1206 #ifdef _DEBUG_TTYFUNCS
1207                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1208 #endif
1209                 return 0;
1210         }
1211 #ifdef _DEBUG_TTYFUNCS
1212         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1213                         mp->outbytes, mp->nack,
1214                         skb_queue_len(&mp->outqueue),
1215                         skb_queue_len(&mp->inqueue));
1216 #endif
1217         return mp->outbytes;
1218 }
1219
1220 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1221                     unsigned int cmd, unsigned long arg)
1222 {
1223         int error = 0;
1224         switch (cmd) {
1225         default:
1226                 error = n_tty_ioctl (tty, file, cmd, arg);
1227                 break;
1228         }
1229         return error;
1230 }
1231
1232 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1233 {
1234 #ifdef _DEBUG_TTYFUNCS
1235         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1236 #endif
1237 }
1238
1239 static void capinc_tty_throttle(struct tty_struct * tty)
1240 {
1241         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1242 #ifdef _DEBUG_TTYFUNCS
1243         printk(KERN_DEBUG "capinc_tty_throttle\n");
1244 #endif
1245         if (mp)
1246                 mp->ttyinstop = 1;
1247 }
1248
1249 static void capinc_tty_unthrottle(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_unthrottle\n");
1255 #endif
1256         if (mp) {
1257                 spin_lock_irqsave(&workaround_lock, flags);
1258                 mp->ttyinstop = 0;
1259                 handle_minor_recv(mp);
1260                 spin_unlock_irqrestore(&workaround_lock, flags);
1261         }
1262 }
1263
1264 static void capinc_tty_stop(struct tty_struct *tty)
1265 {
1266         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1267 #ifdef _DEBUG_TTYFUNCS
1268         printk(KERN_DEBUG "capinc_tty_stop\n");
1269 #endif
1270         if (mp) {
1271                 mp->ttyoutstop = 1;
1272         }
1273 }
1274
1275 static void capinc_tty_start(struct tty_struct *tty)
1276 {
1277         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1278         unsigned long flags;
1279 #ifdef _DEBUG_TTYFUNCS
1280         printk(KERN_DEBUG "capinc_tty_start\n");
1281 #endif
1282         if (mp) {
1283                 spin_lock_irqsave(&workaround_lock, flags);
1284                 mp->ttyoutstop = 0;
1285                 (void)handle_minor_send(mp);
1286                 spin_unlock_irqrestore(&workaround_lock, flags);
1287         }
1288 }
1289
1290 static void capinc_tty_hangup(struct tty_struct *tty)
1291 {
1292 #ifdef _DEBUG_TTYFUNCS
1293         printk(KERN_DEBUG "capinc_tty_hangup\n");
1294 #endif
1295 }
1296
1297 static void capinc_tty_break_ctl(struct tty_struct *tty, int state)
1298 {
1299 #ifdef _DEBUG_TTYFUNCS
1300         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1301 #endif
1302 }
1303
1304 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1305 {
1306 #ifdef _DEBUG_TTYFUNCS
1307         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1308 #endif
1309 }
1310
1311 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1312 {
1313 #ifdef _DEBUG_TTYFUNCS
1314         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1315 #endif
1316 }
1317
1318 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1319 {
1320 #ifdef _DEBUG_TTYFUNCS
1321         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1322 #endif
1323 }
1324
1325 static int capinc_tty_read_proc(char *page, char **start, off_t off,
1326                                 int count, int *eof, void *data)
1327 {
1328         return 0;
1329 }
1330
1331 static struct tty_driver *capinc_tty_driver;
1332
1333 static const struct tty_operations capinc_ops = {
1334         .open = capinc_tty_open,
1335         .close = capinc_tty_close,
1336         .write = capinc_tty_write,
1337         .put_char = capinc_tty_put_char,
1338         .flush_chars = capinc_tty_flush_chars,
1339         .write_room = capinc_tty_write_room,
1340         .chars_in_buffer = capinc_tty_chars_in_buffer,
1341         .ioctl = capinc_tty_ioctl,
1342         .set_termios = capinc_tty_set_termios,
1343         .throttle = capinc_tty_throttle,
1344         .unthrottle = capinc_tty_unthrottle,
1345         .stop = capinc_tty_stop,
1346         .start = capinc_tty_start,
1347         .hangup = capinc_tty_hangup,
1348         .break_ctl = capinc_tty_break_ctl,
1349         .flush_buffer = capinc_tty_flush_buffer,
1350         .set_ldisc = capinc_tty_set_ldisc,
1351         .send_xchar = capinc_tty_send_xchar,
1352         .read_proc = capinc_tty_read_proc,
1353 };
1354
1355 static int capinc_tty_init(void)
1356 {
1357         struct tty_driver *drv;
1358
1359         if (capi_ttyminors > CAPINC_MAX_PORTS)
1360                 capi_ttyminors = CAPINC_MAX_PORTS;
1361         if (capi_ttyminors <= 0)
1362                 capi_ttyminors = CAPINC_NR_PORTS;
1363
1364         drv = alloc_tty_driver(capi_ttyminors);
1365         if (!drv)
1366                 return -ENOMEM;
1367
1368         drv->owner = THIS_MODULE;
1369         drv->driver_name = "capi_nc";
1370         drv->name = "capi";
1371         drv->major = capi_ttymajor;
1372         drv->minor_start = 0;
1373         drv->type = TTY_DRIVER_TYPE_SERIAL;
1374         drv->subtype = SERIAL_TYPE_NORMAL;
1375         drv->init_termios = tty_std_termios;
1376         drv->init_termios.c_iflag = ICRNL;
1377         drv->init_termios.c_oflag = OPOST | ONLCR;
1378         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1379         drv->init_termios.c_lflag = 0;
1380         drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1381         tty_set_operations(drv, &capinc_ops);
1382         if (tty_register_driver(drv)) {
1383                 put_tty_driver(drv);
1384                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1385                 return -1;
1386         }
1387         capinc_tty_driver = drv;
1388         return 0;
1389 }
1390
1391 static void capinc_tty_exit(void)
1392 {
1393         struct tty_driver *drv = capinc_tty_driver;
1394         int retval;
1395         if ((retval = tty_unregister_driver(drv)))
1396                 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1397         put_tty_driver(drv);
1398 }
1399
1400 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1401
1402 /* -------- /proc functions ----------------------------------------- */
1403
1404 /*
1405  * /proc/capi/capi20:
1406  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1407  */
1408 static int proc_capidev_read_proc(char *page, char **start, off_t off,
1409                                        int count, int *eof, void *data)
1410 {
1411         struct capidev *cdev;
1412         struct list_head *l;
1413         int len = 0;
1414
1415         read_lock(&capidev_list_lock);
1416         list_for_each(l, &capidev_list) {
1417                 cdev = list_entry(l, struct capidev, list);
1418                 len += sprintf(page+len, "0 %d %lu %lu %lu %lu\n",
1419                         cdev->ap.applid,
1420                         cdev->ap.nrecvctlpkt,
1421                         cdev->ap.nrecvdatapkt,
1422                         cdev->ap.nsentctlpkt,
1423                         cdev->ap.nsentdatapkt);
1424                 if (len <= off) {
1425                         off -= len;
1426                         len = 0;
1427                 } else {
1428                         if (len-off > count)
1429                                 goto endloop;
1430                 }
1431         }
1432
1433 endloop:
1434         read_unlock(&capidev_list_lock);
1435         if (len < count)
1436                 *eof = 1;
1437         if (len > count) len = count;
1438         if (len < 0) len = 0;
1439         return len;
1440 }
1441
1442 /*
1443  * /proc/capi/capi20ncci:
1444  *  applid ncci
1445  */
1446 static int proc_capincci_read_proc(char *page, char **start, off_t off,
1447                                        int count, int *eof, void *data)
1448 {
1449         struct capidev *cdev;
1450         struct capincci *np;
1451         struct list_head *l;
1452         int len = 0;
1453
1454         read_lock(&capidev_list_lock);
1455         list_for_each(l, &capidev_list) {
1456                 cdev = list_entry(l, struct capidev, list);
1457                 for (np=cdev->nccis; np; np = np->next) {
1458                         len += sprintf(page+len, "%d 0x%x\n",
1459                                        cdev->ap.applid,
1460                                        np->ncci);
1461                         if (len <= off) {
1462                                 off -= len;
1463                                 len = 0;
1464                         } else {
1465                                 if (len-off > count)
1466                                         goto endloop;
1467                         }
1468                 }
1469         }
1470 endloop:
1471         read_unlock(&capidev_list_lock);
1472         *start = page+off;
1473         if (len < count)
1474                 *eof = 1;
1475         if (len>count) len = count;
1476         if (len<0) len = 0;
1477         return len;
1478 }
1479
1480 static struct procfsentries {
1481   char *name;
1482   mode_t mode;
1483   int (*read_proc)(char *page, char **start, off_t off,
1484                                        int count, int *eof, void *data);
1485   struct proc_dir_entry *procent;
1486 } procfsentries[] = {
1487    /* { "capi",           S_IFDIR, 0 }, */
1488    { "capi/capi20",       0      , proc_capidev_read_proc },
1489    { "capi/capi20ncci",   0      , proc_capincci_read_proc },
1490 };
1491
1492 static void __init proc_init(void)
1493 {
1494     int nelem = ARRAY_SIZE(procfsentries);
1495     int i;
1496
1497     for (i=0; i < nelem; i++) {
1498         struct procfsentries *p = procfsentries + i;
1499         p->procent = create_proc_entry(p->name, p->mode, NULL);
1500         if (p->procent) p->procent->read_proc = p->read_proc;
1501     }
1502 }
1503
1504 static void __exit proc_exit(void)
1505 {
1506     int nelem = ARRAY_SIZE(procfsentries);
1507     int i;
1508
1509     for (i=nelem-1; i >= 0; i--) {
1510         struct procfsentries *p = procfsentries + i;
1511         if (p->procent) {
1512            remove_proc_entry(p->name, NULL);
1513            p->procent = NULL;
1514         }
1515     }
1516 }
1517
1518 /* -------- init function and module interface ---------------------- */
1519
1520
1521 static char rev[32];
1522
1523 static int __init capi_init(void)
1524 {
1525         char *p;
1526         char *compileinfo;
1527         int major_ret;
1528
1529         if ((p = strchr(revision, ':')) != 0 && p[1]) {
1530                 strlcpy(rev, p + 2, sizeof(rev));
1531                 if ((p = strchr(rev, '$')) != 0 && p > rev)
1532                    *(p-1) = 0;
1533         } else
1534                 strcpy(rev, "1.0");
1535
1536         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1537         if (major_ret < 0) {
1538                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1539                 return major_ret;
1540         }
1541         capi_class = class_create(THIS_MODULE, "capi");
1542         if (IS_ERR(capi_class)) {
1543                 unregister_chrdev(capi_major, "capi20");
1544                 return PTR_ERR(capi_class);
1545         }
1546
1547         class_device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1548
1549 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1550         if (capinc_tty_init() < 0) {
1551                 class_device_destroy(capi_class, MKDEV(capi_major, 0));
1552                 class_destroy(capi_class);
1553                 unregister_chrdev(capi_major, "capi20");
1554                 return -ENOMEM;
1555         }
1556 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1557
1558         proc_init();
1559
1560 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1561 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1562         compileinfo = " (middleware+capifs)";
1563 #else
1564         compileinfo = " (no capifs)";
1565 #endif
1566 #else
1567         compileinfo = " (no middleware)";
1568 #endif
1569         printk(KERN_NOTICE "capi20: Rev %s: started up with major %d%s\n",
1570                                 rev, capi_major, compileinfo);
1571
1572         return 0;
1573 }
1574
1575 static void __exit capi_exit(void)
1576 {
1577         proc_exit();
1578
1579         class_device_destroy(capi_class, MKDEV(capi_major, 0));
1580         class_destroy(capi_class);
1581         unregister_chrdev(capi_major, "capi20");
1582
1583 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1584         capinc_tty_exit();
1585 #endif
1586         printk(KERN_NOTICE "capi: Rev %s: unloaded\n", rev);
1587 }
1588
1589 module_init(capi_init);
1590 module_exit(capi_exit);