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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 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  27 #include <linux/tty.h>
  28 #ifdef CONFIG_PPP
  29 #include <linux/netdevice.h>
  30 #include <linux/ppp_defs.h>
  31 #include <linux/if_ppp.h>
  32 #endif /* CONFIG_PPP */
  33 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  34 #include <linux/skbuff.h>
  35 #include <linux/proc_fs.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/poll.h>
  38 #include <linux/capi.h>
  39 #include <linux/kernelcapi.h>
  40 #include <linux/init.h>
  41 #include <linux/device.h>
  42 #include <linux/moduleparam.h>
  43 #include <linux/isdn/capiutil.h>
  44 #include <linux/isdn/capicmd.h>
  45
  46 #include "capifs.h"
  47
  48 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  49 MODULE_AUTHOR("Carsten Paeth");
  50 MODULE_LICENSE("GPL");
  51
  52 #undef _DEBUG_REFCOUNT          /* alloc/free and open/close debug */
  53 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  54 #undef _DEBUG_DATAFLOW          /* data flow */
  55
  56 /* -------- driver information -------------------------------------- */
  57
  58 static struct class *capi_class;
  59
  60 static int capi_major = 68;             /* allocated */
  61 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  62 #define CAPINC_NR_PORTS 32
  63 #define CAPINC_MAX_PORTS        256
  64 static int capi_ttymajor = 191;
  65 static int capi_ttyminors = CAPINC_NR_PORTS;
  66 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  67
  68 module_param_named(major, capi_major, uint, 0);
  69 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  70 module_param_named(ttymajor, capi_ttymajor, uint, 0);
  71 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  72 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  73
  74 /* -------- defines ------------------------------------------------- */
  75
  76 #define CAPINC_MAX_RECVQUEUE    10
  77 #define CAPINC_MAX_SENDQUEUE    10
  78 #define CAPI_MAX_BLKSIZE        2048
  79
  80 /* -------- data structures ----------------------------------------- */
  81
  82 struct capidev;
  83 struct capincci;
  84 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  85 struct capiminor;
  86
  87 struct datahandle_queue {
  88         struct list_head        list;
  89         u16                     datahandle;
  90 };
  91
  92 struct capiminor {
  93         struct list_head list;
  94         struct capincci  *nccip;
  95         unsigned int      minor;
  96         struct dentry *capifs_dentry;
  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 mutex ncci_list_mtx;
 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         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                 mp->capifs_dentry =
 330                         capifs_new_ncci(mp->minor,
 331                                         MKDEV(capi_ttymajor, mp->minor));
 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) != NULL) {
 354                                 capifs_free_ncci(mp->capifs_dentry);
 355                                 if (mp->tty) {
 356                                         mp->nccip = NULL;
 357 #ifdef _DEBUG_REFCOUNT
 358                                         printk(KERN_DEBUG "reset mp->nccip\n");
 359 #endif
 360                                         tty_hangup(mp->tty);
 361                                 } else {
 362                                         capiminor_free(mp);
 363                                 }
 364                         }
 365 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 366                         kfree(np);
 367                         if (*pp == NULL) return;
 368                 } else {
 369                         pp = &(*pp)->next;
 370                 }
 371         }
 372 }
 373
 374 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 375 {
 376         struct capincci *p;
 377
 378         for (p=cdev->nccis; p ; p = p->next) {
 379                 if (p->ncci == ncci)
 380                         break;
 381         }
 382         return p;
 383 }
 384
 385 /* -------- struct capidev ------------------------------------------ */
 386
 387 static struct capidev *capidev_alloc(void)
 388 {
 389         struct capidev *cdev;
 390         unsigned long flags;
 391
 392         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 393         if (!cdev)
 394                 return NULL;
 395
 396         mutex_init(&cdev->ncci_list_mtx);
 397         skb_queue_head_init(&cdev->recvqueue);
 398         init_waitqueue_head(&cdev->recvwait);
 399         write_lock_irqsave(&capidev_list_lock, flags);
 400         list_add_tail(&cdev->list, &capidev_list);
 401         write_unlock_irqrestore(&capidev_list_lock, flags);
 402         return cdev;
 403 }
 404
 405 static void capidev_free(struct capidev *cdev)
 406 {
 407         unsigned long flags;
 408
 409         if (cdev->ap.applid) {
 410                 capi20_release(&cdev->ap);
 411                 cdev->ap.applid = 0;
 412         }
 413         skb_queue_purge(&cdev->recvqueue);
 414
 415         mutex_lock(&cdev->ncci_list_mtx);
 416         capincci_free(cdev, 0xffffffff);
 417         mutex_unlock(&cdev->ncci_list_mtx);
 418
 419         write_lock_irqsave(&capidev_list_lock, flags);
 420         list_del(&cdev->list);
 421         write_unlock_irqrestore(&capidev_list_lock, flags);
 422         kfree(cdev);
 423 }
 424
 425 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 426 /* -------- handle data queue --------------------------------------- */
 427
 428 static struct sk_buff *
 429 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 430 {
 431         struct sk_buff *nskb;
 432         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 433         if (nskb) {
 434                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 435                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 436                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 437                 capimsg_setu16(s, 2, mp->ap->applid);
 438                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 439                 capimsg_setu8 (s, 5, CAPI_RESP);
 440                 capimsg_setu16(s, 6, mp->msgid++);
 441                 capimsg_setu32(s, 8, mp->ncci);
 442                 capimsg_setu16(s, 12, datahandle);
 443         }
 444         return nskb;
 445 }
 446
 447 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 448 {
 449         struct sk_buff *nskb;
 450         int datalen;
 451         u16 errcode, datahandle;
 452         struct tty_ldisc *ld;
 453
 454         datalen = skb->len - CAPIMSG_LEN(skb->data);
 455         if (mp->tty == NULL)
 456         {
 457 #ifdef _DEBUG_DATAFLOW
 458                 printk(KERN_DEBUG "capi: currently no receiver\n");
 459 #endif
 460                 return -1;
 461         }
 462
 463         ld = tty_ldisc_ref(mp->tty);
 464         if (ld == NULL)
 465                 return -1;
 466         if (ld->ops->receive_buf == NULL) {
 467 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 468                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 469 #endif
 470                 goto bad;
 471         }
 472         if (mp->ttyinstop) {
 473 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 474                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 475 #endif
 476                 goto bad;
 477         }
 478         if (mp->tty->receive_room < datalen) {
 479 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 480                 printk(KERN_DEBUG "capi: no room in tty\n");
 481 #endif
 482                 goto bad;
 483         }
 484         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 485                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 486                 goto bad;
 487         }
 488         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 489         errcode = capi20_put_message(mp->ap, nskb);
 490         if (errcode != CAPI_NOERROR) {
 491                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 492                                 errcode);
 493                 kfree_skb(nskb);
 494                 goto bad;
 495         }
 496         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 497 #ifdef _DEBUG_DATAFLOW
 498         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 499                                 datahandle, skb->len);
 500 #endif
 501         ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
 502         kfree_skb(skb);
 503         tty_ldisc_deref(ld);
 504         return 0;
 505 bad:
 506         tty_ldisc_deref(ld);
 507         return -1;
 508 }
 509
 510 static void handle_minor_recv(struct capiminor *mp)
 511 {
 512         struct sk_buff *skb;
 513         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 514                 unsigned int len = skb->len;
 515                 mp->inbytes -= len;
 516                 if (handle_recv_skb(mp, skb) < 0) {
 517                         skb_queue_head(&mp->inqueue, skb);
 518                         mp->inbytes += len;
 519                         return;
 520                 }
 521         }
 522 }
 523
 524 static int handle_minor_send(struct capiminor *mp)
 525 {
 526         struct sk_buff *skb;
 527         u16 len;
 528         int count = 0;
 529         u16 errcode;
 530         u16 datahandle;
 531
 532         if (mp->tty && mp->ttyoutstop) {
 533 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 534                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 535 #endif
 536                 return 0;
 537         }
 538
 539         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 540                 datahandle = mp->datahandle;
 541                 len = (u16)skb->len;
 542                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 543                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 544                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 545                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 546                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 547                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 548                 capimsg_setu16(skb->data, 6, mp->msgid++);
 549                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 550                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 551                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 552                 capimsg_setu16(skb->data, 18, datahandle);
 553                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 554
 555                 if (capincci_add_ack(mp, datahandle) < 0) {
 556                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 557                         skb_queue_head(&mp->outqueue, skb);
 558                         return count;
 559                 }
 560                 errcode = capi20_put_message(mp->ap, skb);
 561                 if (errcode == CAPI_NOERROR) {
 562                         mp->datahandle++;
 563                         count++;
 564                         mp->outbytes -= len;
 565 #ifdef _DEBUG_DATAFLOW
 566                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 567                                                         datahandle, len);
 568 #endif
 569                         continue;
 570                 }
 571                 capiminor_del_ack(mp, datahandle);
 572
 573                 if (errcode == CAPI_SENDQUEUEFULL) {
 574                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 575                         skb_queue_head(&mp->outqueue, skb);
 576                         break;
 577                 }
 578
 579                 /* ups, drop packet */
 580                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 581                 mp->outbytes -= len;
 582                 kfree_skb(skb);
 583         }
 584         return count;
 585 }
 586
 587 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 588 /* -------- function called by lower level -------------------------- */
 589
 590 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 591 {
 592         struct capidev *cdev = ap->private;
 593 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 594         struct capiminor *mp;
 595         u16 datahandle;
 596 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 597         struct capincci *np;
 598         u32 ncci;
 599         unsigned long flags;
 600
 601         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 602                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 603                 if ((info & 0xff00) == 0) {
 604                         mutex_lock(&cdev->ncci_list_mtx);
 605                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 606                         mutex_unlock(&cdev->ncci_list_mtx);
 607                 }
 608         }
 609         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
 610                 mutex_lock(&cdev->ncci_list_mtx);
 611                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 612                 mutex_unlock(&cdev->ncci_list_mtx);
 613         }
 614         spin_lock_irqsave(&workaround_lock, flags);
 615         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 616                 skb_queue_tail(&cdev->recvqueue, skb);
 617                 wake_up_interruptible(&cdev->recvwait);
 618                 spin_unlock_irqrestore(&workaround_lock, flags);
 619                 return;
 620         }
 621         ncci = CAPIMSG_CONTROL(skb->data);
 622         for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
 623                 ;
 624         if (!np) {
 625                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 626                 skb_queue_tail(&cdev->recvqueue, skb);
 627                 wake_up_interruptible(&cdev->recvwait);
 628                 spin_unlock_irqrestore(&workaround_lock, flags);
 629                 return;
 630         }
 631 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 632         skb_queue_tail(&cdev->recvqueue, skb);
 633         wake_up_interruptible(&cdev->recvwait);
 634 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 635         mp = np->minorp;
 636         if (!mp) {
 637                 skb_queue_tail(&cdev->recvqueue, skb);
 638                 wake_up_interruptible(&cdev->recvwait);
 639                 spin_unlock_irqrestore(&workaround_lock, flags);
 640                 return;
 641         }
 642
 643
 644         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 645
 646                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 647 #ifdef _DEBUG_DATAFLOW
 648                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 649                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 650 #endif
 651                 skb_queue_tail(&mp->inqueue, skb);
 652                 mp->inbytes += skb->len;
 653                 handle_minor_recv(mp);
 654
 655         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 656
 657                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 658 #ifdef _DEBUG_DATAFLOW
 659                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 660                                 datahandle,
 661                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 662 #endif
 663                 kfree_skb(skb);
 664                 (void)capiminor_del_ack(mp, datahandle);
 665                 if (mp->tty)
 666                         tty_wakeup(mp->tty);
 667                 (void)handle_minor_send(mp);
 668
 669         } else {
 670                 /* ups, let capi application handle it :-) */
 671                 skb_queue_tail(&cdev->recvqueue, skb);
 672                 wake_up_interruptible(&cdev->recvwait);
 673         }
 674 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 675         spin_unlock_irqrestore(&workaround_lock, flags);
 676 }
 677
 678 /* -------- file_operations for capidev ----------------------------- */
 679
 680 static ssize_t
 681 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 682 {
 683         struct capidev *cdev = (struct capidev *)file->private_data;
 684         struct sk_buff *skb;
 685         size_t copied;
 686
 687         if (!cdev->ap.applid)
 688                 return -ENODEV;
 689
 690         if ((skb = skb_dequeue(&cdev->recvqueue)) == NULL) {
 691
 692                 if (file->f_flags & O_NONBLOCK)
 693                         return -EAGAIN;
 694
 695                 for (;;) {
 696                         interruptible_sleep_on(&cdev->recvwait);
 697                         if ((skb = skb_dequeue(&cdev->recvqueue)) != NULL)
 698                                 break;
 699                         if (signal_pending(current))
 700                                 break;
 701                 }
 702                 if (skb == NULL)
 703                         return -ERESTARTNOHAND;
 704         }
 705         if (skb->len > count) {
 706                 skb_queue_head(&cdev->recvqueue, skb);
 707                 return -EMSGSIZE;
 708         }
 709         if (copy_to_user(buf, skb->data, skb->len)) {
 710                 skb_queue_head(&cdev->recvqueue, skb);
 711                 return -EFAULT;
 712         }
 713         copied = skb->len;
 714
 715         kfree_skb(skb);
 716
 717         return copied;
 718 }
 719
 720 static ssize_t
 721 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 722 {
 723         struct capidev *cdev = (struct capidev *)file->private_data;
 724         struct sk_buff *skb;
 725         u16 mlen;
 726
 727         if (!cdev->ap.applid)
 728                 return -ENODEV;
 729
 730         skb = alloc_skb(count, GFP_USER);
 731         if (!skb)
 732                 return -ENOMEM;
 733
 734         if (copy_from_user(skb_put(skb, count), buf, count)) {
 735                 kfree_skb(skb);
 736                 return -EFAULT;
 737         }
 738         mlen = CAPIMSG_LEN(skb->data);
 739         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 740                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 741                         kfree_skb(skb);
 742                         return -EINVAL;
 743                 }
 744         } else {
 745                 if (mlen != count) {
 746                         kfree_skb(skb);
 747                         return -EINVAL;
 748                 }
 749         }
 750         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 751
 752         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 753                 mutex_lock(&cdev->ncci_list_mtx);
 754                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 755                 mutex_unlock(&cdev->ncci_list_mtx);
 756         }
 757
 758         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 759
 760         if (cdev->errcode) {
 761                 kfree_skb(skb);
 762                 return -EIO;
 763         }
 764         return count;
 765 }
 766
 767 static unsigned int
 768 capi_poll(struct file *file, poll_table * wait)
 769 {
 770         struct capidev *cdev = (struct capidev *)file->private_data;
 771         unsigned int mask = 0;
 772
 773         if (!cdev->ap.applid)
 774                 return POLLERR;
 775
 776         poll_wait(file, &(cdev->recvwait), wait);
 777         mask = POLLOUT | POLLWRNORM;
 778         if (!skb_queue_empty(&cdev->recvqueue))
 779                 mask |= POLLIN | POLLRDNORM;
 780         return mask;
 781 }
 782
 783 static int
 784 capi_ioctl(struct inode *inode, struct file *file,
 785            unsigned int cmd, unsigned long arg)
 786 {
 787         struct capidev *cdev = file->private_data;
 788         struct capi20_appl *ap = &cdev->ap;
 789         capi_ioctl_struct data;
 790         int retval = -EINVAL;
 791         void __user *argp = (void __user *)arg;
 792
 793         switch (cmd) {
 794         case CAPI_REGISTER:
 795                 {
 796                         if (ap->applid)
 797                                 return -EEXIST;
 798
 799                         if (copy_from_user(&cdev->ap.rparam, argp,
 800                                            sizeof(struct capi_register_params)))
 801                                 return -EFAULT;
 802
 803                         cdev->ap.private = cdev;
 804                         cdev->ap.recv_message = capi_recv_message;
 805                         cdev->errcode = capi20_register(ap);
 806                         if (cdev->errcode) {
 807                                 ap->applid = 0;
 808                                 return -EIO;
 809                         }
 810                 }
 811                 return (int)ap->applid;
 812
 813         case CAPI_GET_VERSION:
 814                 {
 815                         if (copy_from_user(&data.contr, argp,
 816                                                 sizeof(data.contr)))
 817                                 return -EFAULT;
 818                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 819                         if (cdev->errcode)
 820                                 return -EIO;
 821                         if (copy_to_user(argp, &data.version,
 822                                          sizeof(data.version)))
 823                                 return -EFAULT;
 824                 }
 825                 return 0;
 826
 827         case CAPI_GET_SERIAL:
 828                 {
 829                         if (copy_from_user(&data.contr, argp,
 830                                            sizeof(data.contr)))
 831                                 return -EFAULT;
 832                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 833                         if (cdev->errcode)
 834                                 return -EIO;
 835                         if (copy_to_user(argp, data.serial,
 836                                          sizeof(data.serial)))
 837                                 return -EFAULT;
 838                 }
 839                 return 0;
 840         case CAPI_GET_PROFILE:
 841                 {
 842                         if (copy_from_user(&data.contr, argp,
 843                                            sizeof(data.contr)))
 844                                 return -EFAULT;
 845
 846                         if (data.contr == 0) {
 847                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 848                                 if (cdev->errcode)
 849                                         return -EIO;
 850
 851                                 retval = copy_to_user(argp,
 852                                       &data.profile.ncontroller,
 853                                        sizeof(data.profile.ncontroller));
 854
 855                         } else {
 856                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 857                                 if (cdev->errcode)
 858                                         return -EIO;
 859
 860                                 retval = copy_to_user(argp, &data.profile,
 861                                                    sizeof(data.profile));
 862                         }
 863                         if (retval)
 864                                 return -EFAULT;
 865                 }
 866                 return 0;
 867
 868         case CAPI_GET_MANUFACTURER:
 869                 {
 870                         if (copy_from_user(&data.contr, argp,
 871                                            sizeof(data.contr)))
 872                                 return -EFAULT;
 873                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 874                         if (cdev->errcode)
 875                                 return -EIO;
 876
 877                         if (copy_to_user(argp, data.manufacturer,
 878                                          sizeof(data.manufacturer)))
 879                                 return -EFAULT;
 880
 881                 }
 882                 return 0;
 883         case CAPI_GET_ERRCODE:
 884                 data.errcode = cdev->errcode;
 885                 cdev->errcode = CAPI_NOERROR;
 886                 if (arg) {
 887                         if (copy_to_user(argp, &data.errcode,
 888                                          sizeof(data.errcode)))
 889                                 return -EFAULT;
 890                 }
 891                 return data.errcode;
 892
 893         case CAPI_INSTALLED:
 894                 if (capi20_isinstalled() == CAPI_NOERROR)
 895                         return 0;
 896                 return -ENXIO;
 897
 898         case CAPI_MANUFACTURER_CMD:
 899                 {
 900                         struct capi_manufacturer_cmd mcmd;
 901                         if (!capable(CAP_SYS_ADMIN))
 902                                 return -EPERM;
 903                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 904                                 return -EFAULT;
 905                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 906                 }
 907                 return 0;
 908
 909         case CAPI_SET_FLAGS:
 910         case CAPI_CLR_FLAGS:
 911                 {
 912                         unsigned userflags;
 913                         if (copy_from_user(&userflags, argp,
 914                                            sizeof(userflags)))
 915                                 return -EFAULT;
 916                         if (cmd == CAPI_SET_FLAGS)
 917                                 cdev->userflags |= userflags;
 918                         else
 919                                 cdev->userflags &= ~userflags;
 920                 }
 921                 return 0;
 922
 923         case CAPI_GET_FLAGS:
 924                 if (copy_to_user(argp, &cdev->userflags,
 925                                  sizeof(cdev->userflags)))
 926                         return -EFAULT;
 927                 return 0;
 928
 929         case CAPI_NCCI_OPENCOUNT:
 930                 {
 931                         struct capincci *nccip;
 932 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 933                         struct capiminor *mp;
 934 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 935                         unsigned ncci;
 936                         int count = 0;
 937                         if (copy_from_user(&ncci, argp, sizeof(ncci)))
 938                                 return -EFAULT;
 939
 940                         mutex_lock(&cdev->ncci_list_mtx);
 941                         if ((nccip = capincci_find(cdev, (u32) ncci)) == NULL) {
 942                                 mutex_unlock(&cdev->ncci_list_mtx);
 943                                 return 0;
 944                         }
 945 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 946                         if ((mp = nccip->minorp) != NULL) {
 947                                 count += atomic_read(&mp->ttyopencount);
 948                         }
 949 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 950                         mutex_unlock(&cdev->ncci_list_mtx);
 951                         return count;
 952                 }
 953                 return 0;
 954
 955 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 956         case CAPI_NCCI_GETUNIT:
 957                 {
 958                         struct capincci *nccip;
 959                         struct capiminor *mp;
 960                         unsigned ncci;
 961                         int unit = 0;
 962                         if (copy_from_user(&ncci, argp,
 963                                            sizeof(ncci)))
 964                                 return -EFAULT;
 965                         mutex_lock(&cdev->ncci_list_mtx);
 966                         nccip = capincci_find(cdev, (u32) ncci);
 967                         if (!nccip || (mp = nccip->minorp) == NULL) {
 968                                 mutex_unlock(&cdev->ncci_list_mtx);
 969                                 return -ESRCH;
 970                         }
 971                         unit = mp->minor;
 972                         mutex_unlock(&cdev->ncci_list_mtx);
 973                         return unit;
 974                 }
 975                 return 0;
 976 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 977         }
 978         return -EINVAL;
 979 }
 980
 981 static int
 982 capi_open(struct inode *inode, struct file *file)
 983 {
 984         int ret;
 985
 986         lock_kernel();
 987         if (file->private_data)
 988                 ret = -EEXIST;
 989         else if ((file->private_data = capidev_alloc()) == NULL)
 990                 ret = -ENOMEM;
 991         else
 992                 ret = nonseekable_open(inode, file);
 993         unlock_kernel();
 994         return ret;
 995 }
 996
 997 static int
 998 capi_release(struct inode *inode, struct file *file)
 999 {
1000         struct capidev *cdev = (struct capidev *)file->private_data;
1001
1002         capidev_free(cdev);
1003         file->private_data = NULL;
1004
1005         return 0;
1006 }
1007
1008 static const struct file_operations capi_fops =
1009 {
1010         .owner          = THIS_MODULE,
1011         .llseek         = no_llseek,
1012         .read           = capi_read,
1013         .write          = capi_write,
1014         .poll           = capi_poll,
1015         .ioctl          = capi_ioctl,
1016         .open           = capi_open,
1017         .release        = capi_release,
1018 };
1019
1020 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1021 /* -------- tty_operations for capincci ----------------------------- */
1022
1023 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
1024 {
1025         struct capiminor *mp;
1026         unsigned long flags;
1027
1028         if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == NULL)
1029                 return -ENXIO;
1030         if (mp->nccip == NULL)
1031                 return -ENXIO;
1032
1033         tty->driver_data = (void *)mp;
1034
1035         spin_lock_irqsave(&workaround_lock, flags);
1036         if (atomic_read(&mp->ttyopencount) == 0)
1037                 mp->tty = tty;
1038         atomic_inc(&mp->ttyopencount);
1039 #ifdef _DEBUG_REFCOUNT
1040         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1041 #endif
1042         handle_minor_recv(mp);
1043         spin_unlock_irqrestore(&workaround_lock, flags);
1044         return 0;
1045 }
1046
1047 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1048 {
1049         struct capiminor *mp;
1050
1051         mp = (struct capiminor *)tty->driver_data;
1052         if (mp) {
1053                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1054 #ifdef _DEBUG_REFCOUNT
1055                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1056 #endif
1057                         tty->driver_data = NULL;
1058                         mp->tty = NULL;
1059                 }
1060 #ifdef _DEBUG_REFCOUNT
1061                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1062 #endif
1063                 if (mp->nccip == NULL)
1064                         capiminor_free(mp);
1065         }
1066
1067 #ifdef _DEBUG_REFCOUNT
1068         printk(KERN_DEBUG "capinc_tty_close\n");
1069 #endif
1070 }
1071
1072 static int capinc_tty_write(struct tty_struct * tty,
1073                             const unsigned char *buf, int count)
1074 {
1075         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1076         struct sk_buff *skb;
1077         unsigned long flags;
1078
1079 #ifdef _DEBUG_TTYFUNCS
1080         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1081 #endif
1082
1083         if (!mp || !mp->nccip) {
1084 #ifdef _DEBUG_TTYFUNCS
1085                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1086 #endif
1087                 return 0;
1088         }
1089
1090         spin_lock_irqsave(&workaround_lock, flags);
1091         skb = mp->ttyskb;
1092         if (skb) {
1093                 mp->ttyskb = NULL;
1094                 skb_queue_tail(&mp->outqueue, skb);
1095                 mp->outbytes += skb->len;
1096         }
1097
1098         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1099         if (!skb) {
1100                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1101                 spin_unlock_irqrestore(&workaround_lock, flags);
1102                 return -ENOMEM;
1103         }
1104
1105         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1106         memcpy(skb_put(skb, count), buf, count);
1107
1108         skb_queue_tail(&mp->outqueue, skb);
1109         mp->outbytes += skb->len;
1110         (void)handle_minor_send(mp);
1111         (void)handle_minor_recv(mp);
1112         spin_unlock_irqrestore(&workaround_lock, flags);
1113         return count;
1114 }
1115
1116 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1117 {
1118         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1119         struct sk_buff *skb;
1120         unsigned long flags;
1121         int ret = 1;
1122
1123 #ifdef _DEBUG_TTYFUNCS
1124         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1125 #endif
1126
1127         if (!mp || !mp->nccip) {
1128 #ifdef _DEBUG_TTYFUNCS
1129                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1130 #endif
1131                 return 0;
1132         }
1133
1134         spin_lock_irqsave(&workaround_lock, flags);
1135         skb = mp->ttyskb;
1136         if (skb) {
1137                 if (skb_tailroom(skb) > 0) {
1138                         *(skb_put(skb, 1)) = ch;
1139                         spin_unlock_irqrestore(&workaround_lock, flags);
1140                         return 1;
1141                 }
1142                 mp->ttyskb = NULL;
1143                 skb_queue_tail(&mp->outqueue, skb);
1144                 mp->outbytes += skb->len;
1145                 (void)handle_minor_send(mp);
1146         }
1147         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1148         if (skb) {
1149                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1150                 *(skb_put(skb, 1)) = ch;
1151                 mp->ttyskb = skb;
1152         } else {
1153                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1154                 ret = 0;
1155         }
1156         spin_unlock_irqrestore(&workaround_lock, flags);
1157         return ret;
1158 }
1159
1160 static void capinc_tty_flush_chars(struct tty_struct *tty)
1161 {
1162         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1163         struct sk_buff *skb;
1164         unsigned long flags;
1165
1166 #ifdef _DEBUG_TTYFUNCS
1167         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1168 #endif
1169
1170         if (!mp || !mp->nccip) {
1171 #ifdef _DEBUG_TTYFUNCS
1172                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1173 #endif
1174                 return;
1175         }
1176
1177         spin_lock_irqsave(&workaround_lock, flags);
1178         skb = mp->ttyskb;
1179         if (skb) {
1180                 mp->ttyskb = NULL;
1181                 skb_queue_tail(&mp->outqueue, skb);
1182                 mp->outbytes += skb->len;
1183                 (void)handle_minor_send(mp);
1184         }
1185         (void)handle_minor_recv(mp);
1186         spin_unlock_irqrestore(&workaround_lock, flags);
1187 }
1188
1189 static int capinc_tty_write_room(struct tty_struct *tty)
1190 {
1191         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1192         int room;
1193         if (!mp || !mp->nccip) {
1194 #ifdef _DEBUG_TTYFUNCS
1195                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1196 #endif
1197                 return 0;
1198         }
1199         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1200         room *= CAPI_MAX_BLKSIZE;
1201 #ifdef _DEBUG_TTYFUNCS
1202         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1203 #endif
1204         return room;
1205 }
1206
1207 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1208 {
1209         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1210         if (!mp || !mp->nccip) {
1211 #ifdef _DEBUG_TTYFUNCS
1212                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1213 #endif
1214                 return 0;
1215         }
1216 #ifdef _DEBUG_TTYFUNCS
1217         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1218                         mp->outbytes, mp->nack,
1219                         skb_queue_len(&mp->outqueue),
1220                         skb_queue_len(&mp->inqueue));
1221 #endif
1222         return mp->outbytes;
1223 }
1224
1225 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1226                     unsigned int cmd, unsigned long arg)
1227 {
1228         int error = 0;
1229         switch (cmd) {
1230         default:
1231                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1232                 break;
1233         }
1234         return error;
1235 }
1236
1237 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1238 {
1239 #ifdef _DEBUG_TTYFUNCS
1240         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1241 #endif
1242 }
1243
1244 static void capinc_tty_throttle(struct tty_struct * tty)
1245 {
1246         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1247 #ifdef _DEBUG_TTYFUNCS
1248         printk(KERN_DEBUG "capinc_tty_throttle\n");
1249 #endif
1250         if (mp)
1251                 mp->ttyinstop = 1;
1252 }
1253
1254 static void capinc_tty_unthrottle(struct tty_struct * tty)
1255 {
1256         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1257         unsigned long flags;
1258 #ifdef _DEBUG_TTYFUNCS
1259         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1260 #endif
1261         if (mp) {
1262                 spin_lock_irqsave(&workaround_lock, flags);
1263                 mp->ttyinstop = 0;
1264                 handle_minor_recv(mp);
1265                 spin_unlock_irqrestore(&workaround_lock, flags);
1266         }
1267 }
1268
1269 static void capinc_tty_stop(struct tty_struct *tty)
1270 {
1271         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1272 #ifdef _DEBUG_TTYFUNCS
1273         printk(KERN_DEBUG "capinc_tty_stop\n");
1274 #endif
1275         if (mp) {
1276                 mp->ttyoutstop = 1;
1277         }
1278 }
1279
1280 static void capinc_tty_start(struct tty_struct *tty)
1281 {
1282         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1283         unsigned long flags;
1284 #ifdef _DEBUG_TTYFUNCS
1285         printk(KERN_DEBUG "capinc_tty_start\n");
1286 #endif
1287         if (mp) {
1288                 spin_lock_irqsave(&workaround_lock, flags);
1289                 mp->ttyoutstop = 0;
1290                 (void)handle_minor_send(mp);
1291                 spin_unlock_irqrestore(&workaround_lock, flags);
1292         }
1293 }
1294
1295 static void capinc_tty_hangup(struct tty_struct *tty)
1296 {
1297 #ifdef _DEBUG_TTYFUNCS
1298         printk(KERN_DEBUG "capinc_tty_hangup\n");
1299 #endif
1300 }
1301
1302 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1303 {
1304 #ifdef _DEBUG_TTYFUNCS
1305         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1306 #endif
1307         return 0;
1308 }
1309
1310 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1311 {
1312 #ifdef _DEBUG_TTYFUNCS
1313         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1314 #endif
1315 }
1316
1317 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1318 {
1319 #ifdef _DEBUG_TTYFUNCS
1320         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1321 #endif
1322 }
1323
1324 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1325 {
1326 #ifdef _DEBUG_TTYFUNCS
1327         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1328 #endif
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 };
1353
1354 static int capinc_tty_init(void)
1355 {
1356         struct tty_driver *drv;
1357
1358         if (capi_ttyminors > CAPINC_MAX_PORTS)
1359                 capi_ttyminors = CAPINC_MAX_PORTS;
1360         if (capi_ttyminors <= 0)
1361                 capi_ttyminors = CAPINC_NR_PORTS;
1362
1363         drv = alloc_tty_driver(capi_ttyminors);
1364         if (!drv)
1365                 return -ENOMEM;
1366
1367         drv->owner = THIS_MODULE;
1368         drv->driver_name = "capi_nc";
1369         drv->name = "capi";
1370         drv->major = capi_ttymajor;
1371         drv->minor_start = 0;
1372         drv->type = TTY_DRIVER_TYPE_SERIAL;
1373         drv->subtype = SERIAL_TYPE_NORMAL;
1374         drv->init_termios = tty_std_termios;
1375         drv->init_termios.c_iflag = ICRNL;
1376         drv->init_termios.c_oflag = OPOST | ONLCR;
1377         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1378         drv->init_termios.c_lflag = 0;
1379         drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1380         tty_set_operations(drv, &capinc_ops);
1381         if (tty_register_driver(drv)) {
1382                 put_tty_driver(drv);
1383                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1384                 return -1;
1385         }
1386         capinc_tty_driver = drv;
1387         return 0;
1388 }
1389
1390 static void capinc_tty_exit(void)
1391 {
1392         struct tty_driver *drv = capinc_tty_driver;
1393         int retval;
1394         if ((retval = tty_unregister_driver(drv)))
1395                 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1396         put_tty_driver(drv);
1397 }
1398
1399 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1400
1401 /* -------- /proc functions ----------------------------------------- */
1402
1403 /*
1404  * /proc/capi/capi20:
1405  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1406  */
1407 static int capi20_proc_show(struct seq_file *m, void *v)
1408 {
1409         struct capidev *cdev;
1410         struct list_head *l;
1411
1412         read_lock(&capidev_list_lock);
1413         list_for_each(l, &capidev_list) {
1414                 cdev = list_entry(l, struct capidev, list);
1415                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1416                         cdev->ap.applid,
1417                         cdev->ap.nrecvctlpkt,
1418                         cdev->ap.nrecvdatapkt,
1419                         cdev->ap.nsentctlpkt,
1420                         cdev->ap.nsentdatapkt);
1421         }
1422         read_unlock(&capidev_list_lock);
1423         return 0;
1424 }
1425
1426 static int capi20_proc_open(struct inode *inode, struct file *file)
1427 {
1428         return single_open(file, capi20_proc_show, NULL);
1429 }
1430
1431 static const struct file_operations capi20_proc_fops = {
1432         .owner          = THIS_MODULE,
1433         .open           = capi20_proc_open,
1434         .read           = seq_read,
1435         .llseek         = seq_lseek,
1436         .release        = single_release,
1437 };
1438
1439 /*
1440  * /proc/capi/capi20ncci:
1441  *  applid ncci
1442  */
1443 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1444 {
1445         struct capidev *cdev;
1446         struct capincci *np;
1447         struct list_head *l;
1448
1449         read_lock(&capidev_list_lock);
1450         list_for_each(l, &capidev_list) {
1451                 cdev = list_entry(l, struct capidev, list);
1452                 for (np=cdev->nccis; np; np = np->next) {
1453                         seq_printf(m, "%d 0x%x\n",
1454                                        cdev->ap.applid,
1455                                        np->ncci);
1456                 }
1457         }
1458         read_unlock(&capidev_list_lock);
1459         return 0;
1460 }
1461
1462 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1463 {
1464         return single_open(file, capi20ncci_proc_show, NULL);
1465 }
1466
1467 static const struct file_operations capi20ncci_proc_fops = {
1468         .owner          = THIS_MODULE,
1469         .open           = capi20ncci_proc_open,
1470         .read           = seq_read,
1471         .llseek         = seq_lseek,
1472         .release        = single_release,
1473 };
1474
1475 static void __init proc_init(void)
1476 {
1477         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1478         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1479 }
1480
1481 static void __exit proc_exit(void)
1482 {
1483         remove_proc_entry("capi/capi20", NULL);
1484         remove_proc_entry("capi/capi20ncci", NULL);
1485 }
1486
1487 /* -------- init function and module interface ---------------------- */
1488
1489
1490 static int __init capi_init(void)
1491 {
1492         const char *compileinfo;
1493         int major_ret;
1494
1495         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1496         if (major_ret < 0) {
1497                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1498                 return major_ret;
1499         }
1500         capi_class = class_create(THIS_MODULE, "capi");
1501         if (IS_ERR(capi_class)) {
1502                 unregister_chrdev(capi_major, "capi20");
1503                 return PTR_ERR(capi_class);
1504         }
1505
1506         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1507
1508 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1509         if (capinc_tty_init() < 0) {
1510                 device_destroy(capi_class, MKDEV(capi_major, 0));
1511                 class_destroy(capi_class);
1512                 unregister_chrdev(capi_major, "capi20");
1513                 return -ENOMEM;
1514         }
1515 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
1516
1517         proc_init();
1518
1519 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1520 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1521         compileinfo = " (middleware+capifs)";
1522 #else
1523         compileinfo = " (no capifs)";
1524 #endif
1525 #else
1526         compileinfo = " (no middleware)";
1527 #endif
1528         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1529                capi_major, compileinfo);
1530
1531         return 0;
1532 }
1533
1534 static void __exit capi_exit(void)
1535 {
1536         proc_exit();
1537
1538         device_destroy(capi_class, MKDEV(capi_major, 0));
1539         class_destroy(capi_class);
1540         unregister_chrdev(capi_major, "capi20");
1541
1542 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1543         capinc_tty_exit();
1544 #endif
1545 }
1546
1547 module_init(capi_init);
1548 module_exit(capi_exit);