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   1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
   2  *
   3  * CAPI 2.0 Interface for Linux
   4  *
   5  * Copyright 1996 by Carsten Paeth <calle@calle.de>
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/major.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/fs.h>
  20 #include <linux/signal.h>
  21 #include <linux/mutex.h>
  22 #include <linux/mm.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/timer.h>
  25 #include <linux/wait.h>
  26 #include <linux/tty.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/ppp_defs.h>
  29 #include <linux/if_ppp.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/poll.h>
  34 #include <linux/capi.h>
  35 #include <linux/kernelcapi.h>
  36 #include <linux/init.h>
  37 #include <linux/device.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/isdn/capiutil.h>
  40 #include <linux/isdn/capicmd.h>
  41
  42 #include "capifs.h"
  43
  44 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  45 MODULE_AUTHOR("Carsten Paeth");
  46 MODULE_LICENSE("GPL");
  47
  48 #undef _DEBUG_REFCOUNT          /* alloc/free and open/close debug */
  49 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  50 #undef _DEBUG_DATAFLOW          /* data flow */
  51
  52 /* -------- driver information -------------------------------------- */
  53
  54 static struct class *capi_class;
  55 static int capi_major = 68;             /* allocated */
  56
  57 module_param_named(major, capi_major, uint, 0);
  58
  59 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  60 #define CAPINC_NR_PORTS         32
  61 #define CAPINC_MAX_PORTS        256
  62
  63 static int capi_ttymajor = 191;
  64 static int capi_ttyminors = CAPINC_NR_PORTS;
  65
  66 module_param_named(ttymajor, capi_ttymajor, uint, 0);
  67 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  68 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  69
  70 /* -------- defines ------------------------------------------------- */
  71
  72 #define CAPINC_MAX_RECVQUEUE    10
  73 #define CAPINC_MAX_SENDQUEUE    10
  74 #define CAPI_MAX_BLKSIZE        2048
  75
  76 /* -------- data structures ----------------------------------------- */
  77
  78 struct capidev;
  79 struct capincci;
  80 struct capiminor;
  81
  82 struct datahandle_queue {
  83         struct list_head        list;
  84         u16                     datahandle;
  85 };
  86
  87 struct capiminor {
  88         struct list_head list;
  89         struct capincci  *nccip;
  90         unsigned int      minor;
  91         struct dentry *capifs_dentry;
  92
  93         struct capi20_appl *ap;
  94         u32              ncci;
  95         u16              datahandle;
  96         u16              msgid;
  97
  98         struct tty_struct *tty;
  99         int                ttyinstop;
 100         int                ttyoutstop;
 101         struct sk_buff    *ttyskb;
 102         atomic_t           ttyopencount;
 103
 104         struct sk_buff_head inqueue;
 105         int                 inbytes;
 106         struct sk_buff_head outqueue;
 107         int                 outbytes;
 108
 109         /* transmit path */
 110         struct list_head ackqueue;
 111         int nack;
 112         spinlock_t ackqlock;
 113 };
 114
 115 /* FIXME: The following lock is a sledgehammer-workaround to a
 116  * locking issue with the capiminor (and maybe other) data structure(s).
 117  * Access to this data is done in a racy way and crashes the machine with
 118  * a FritzCard DSL driver; sooner or later. This is a workaround
 119  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 120  * The correct (and scalable) fix for the issue seems to require
 121  * an API change to the drivers... . */
 122 static DEFINE_SPINLOCK(workaround_lock);
 123
 124 struct capincci {
 125         struct capincci *next;
 126         u32              ncci;
 127         struct capidev  *cdev;
 128 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 129         struct capiminor *minorp;
 130 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 131 };
 132
 133 struct capidev {
 134         struct list_head list;
 135         struct capi20_appl ap;
 136         u16             errcode;
 137         unsigned        userflags;
 138
 139         struct sk_buff_head recvqueue;
 140         wait_queue_head_t recvwait;
 141
 142         struct capincci *nccis;
 143
 144         struct mutex ncci_list_mtx;
 145 };
 146
 147 /* -------- global variables ---------------------------------------- */
 148
 149 static DEFINE_MUTEX(capidev_list_lock);
 150 static LIST_HEAD(capidev_list);
 151
 152 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 153
 154 static DEFINE_RWLOCK(capiminor_list_lock);
 155 static LIST_HEAD(capiminor_list);
 156
 157 /* -------- datahandles --------------------------------------------- */
 158
 159 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 160 {
 161         struct datahandle_queue *n;
 162         unsigned long flags;
 163
 164         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 165         if (unlikely(!n)) {
 166                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 167                 return -1;
 168         }
 169         n->datahandle = datahandle;
 170         INIT_LIST_HEAD(&n->list);
 171         spin_lock_irqsave(&mp->ackqlock, flags);
 172         list_add_tail(&n->list, &mp->ackqueue);
 173         mp->nack++;
 174         spin_unlock_irqrestore(&mp->ackqlock, flags);
 175         return 0;
 176 }
 177
 178 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 179 {
 180         struct datahandle_queue *p, *tmp;
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&mp->ackqlock, flags);
 184         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 185                 if (p->datahandle == datahandle) {
 186                         list_del(&p->list);
 187                         kfree(p);
 188                         mp->nack--;
 189                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 190                         return 0;
 191                 }
 192         }
 193         spin_unlock_irqrestore(&mp->ackqlock, flags);
 194         return -1;
 195 }
 196
 197 static void capiminor_del_all_ack(struct capiminor *mp)
 198 {
 199         struct datahandle_queue *p, *tmp;
 200         unsigned long flags;
 201
 202         spin_lock_irqsave(&mp->ackqlock, flags);
 203         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 204                 list_del(&p->list);
 205                 kfree(p);
 206                 mp->nack--;
 207         }
 208         spin_unlock_irqrestore(&mp->ackqlock, flags);
 209 }
 210
 211
 212 /* -------- struct capiminor ---------------------------------------- */
 213
 214 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 215 {
 216         struct capiminor *mp, *p;
 217         unsigned int minor = 0;
 218         unsigned long flags;
 219
 220         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 221         if (!mp) {
 222                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 223                 return NULL;
 224         }
 225
 226         mp->ap = ap;
 227         mp->ncci = ncci;
 228         mp->msgid = 0;
 229         atomic_set(&mp->ttyopencount,0);
 230         INIT_LIST_HEAD(&mp->ackqueue);
 231         spin_lock_init(&mp->ackqlock);
 232
 233         skb_queue_head_init(&mp->inqueue);
 234         skb_queue_head_init(&mp->outqueue);
 235
 236         /* Allocate the least unused minor number.
 237          */
 238         write_lock_irqsave(&capiminor_list_lock, flags);
 239         if (list_empty(&capiminor_list))
 240                 list_add(&mp->list, &capiminor_list);
 241         else {
 242                 list_for_each_entry(p, &capiminor_list, list) {
 243                         if (p->minor > minor)
 244                                 break;
 245                         minor++;
 246                 }
 247
 248                 if (minor < capi_ttyminors) {
 249                         mp->minor = minor;
 250                         list_add(&mp->list, p->list.prev);
 251                 }
 252         }
 253                 write_unlock_irqrestore(&capiminor_list_lock, flags);
 254
 255         if (!(minor < capi_ttyminors)) {
 256                 printk(KERN_NOTICE "capi: out of minors\n");
 257                         kfree(mp);
 258                 return NULL;
 259         }
 260
 261         return mp;
 262 }
 263
 264 static void capiminor_free(struct capiminor *mp)
 265 {
 266         unsigned long flags;
 267
 268         write_lock_irqsave(&capiminor_list_lock, flags);
 269         list_del(&mp->list);
 270         write_unlock_irqrestore(&capiminor_list_lock, flags);
 271
 272         kfree_skb(mp->ttyskb);
 273         mp->ttyskb = NULL;
 274         skb_queue_purge(&mp->inqueue);
 275         skb_queue_purge(&mp->outqueue);
 276         capiminor_del_all_ack(mp);
 277         kfree(mp);
 278 }
 279
 280 static struct capiminor *capiminor_find(unsigned int minor)
 281 {
 282         struct list_head *l;
 283         struct capiminor *p = NULL;
 284
 285         read_lock(&capiminor_list_lock);
 286         list_for_each(l, &capiminor_list) {
 287                 p = list_entry(l, struct capiminor, list);
 288                 if (p->minor == minor)
 289                         break;
 290         }
 291         read_unlock(&capiminor_list_lock);
 292         if (l == &capiminor_list)
 293                 return NULL;
 294
 295         return p;
 296 }
 297
 298 /* -------- struct capincci ----------------------------------------- */
 299
 300 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 301 {
 302         struct capiminor *mp;
 303
 304         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 305                 return;
 306
 307         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 308         if (mp) {
 309                 mp->nccip = np;
 310 #ifdef _DEBUG_REFCOUNT
 311                 printk(KERN_DEBUG "set mp->nccip\n");
 312 #endif
 313                 mp->capifs_dentry =
 314                         capifs_new_ncci(mp->minor,
 315                                         MKDEV(capi_ttymajor, mp->minor));
 316         }
 317 }
 318
 319 static void capincci_free_minor(struct capincci *np)
 320 {
 321         struct capiminor *mp = np->minorp;
 322
 323         if (mp) {
 324                 capifs_free_ncci(mp->capifs_dentry);
 325                 if (mp->tty) {
 326                         mp->nccip = NULL;
 327 #ifdef _DEBUG_REFCOUNT
 328                         printk(KERN_DEBUG "reset mp->nccip\n");
 329 #endif
 330                         tty_hangup(mp->tty);
 331                 } else {
 332                         capiminor_free(mp);
 333                 }
 334         }
 335 }
 336
 337 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 338 {
 339         struct capiminor *mp = np->minorp;
 340
 341         return mp ? atomic_read(&mp->ttyopencount) : 0;
 342 }
 343
 344 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 345
 346 static inline void
 347 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 348 static inline void capincci_free_minor(struct capincci *np) { }
 349
 350 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 351 {
 352         return 0;
 353 }
 354
 355 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 356
 357 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 358 {
 359         struct capincci *np, **pp;
 360
 361         np = kzalloc(sizeof(*np), GFP_ATOMIC);
 362         if (!np)
 363                 return NULL;
 364         np->ncci = ncci;
 365         np->cdev = cdev;
 366
 367         capincci_alloc_minor(cdev, np);
 368
 369         for (pp=&cdev->nccis; *pp; pp = &(*pp)->next)
 370                 ;
 371         *pp = np;
 372         return np;
 373 }
 374
 375 static void capincci_free(struct capidev *cdev, u32 ncci)
 376 {
 377         struct capincci *np, **pp;
 378
 379         pp=&cdev->nccis;
 380         while (*pp) {
 381                 np = *pp;
 382                 if (ncci == 0xffffffff || np->ncci == ncci) {
 383                         *pp = (*pp)->next;
 384                         capincci_free_minor(np);
 385                         kfree(np);
 386                         if (*pp == NULL) return;
 387                 } else {
 388                         pp = &(*pp)->next;
 389                 }
 390         }
 391 }
 392
 393 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 394 {
 395         struct capincci *p;
 396
 397         for (p=cdev->nccis; p ; p = p->next) {
 398                 if (p->ncci == ncci)
 399                         break;
 400         }
 401         return p;
 402 }
 403
 404 /* -------- struct capidev ------------------------------------------ */
 405
 406 static struct capidev *capidev_alloc(void)
 407 {
 408         struct capidev *cdev;
 409
 410         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 411         if (!cdev)
 412                 return NULL;
 413
 414         mutex_init(&cdev->ncci_list_mtx);
 415         skb_queue_head_init(&cdev->recvqueue);
 416         init_waitqueue_head(&cdev->recvwait);
 417
 418         mutex_lock(&capidev_list_lock);
 419         list_add_tail(&cdev->list, &capidev_list);
 420         mutex_unlock(&capidev_list_lock);
 421
 422         return cdev;
 423 }
 424
 425 static void capidev_free(struct capidev *cdev)
 426 {
 427         mutex_lock(&capidev_list_lock);
 428         list_del(&cdev->list);
 429         mutex_unlock(&capidev_list_lock);
 430
 431         if (cdev->ap.applid) {
 432                 capi20_release(&cdev->ap);
 433                 cdev->ap.applid = 0;
 434         }
 435         skb_queue_purge(&cdev->recvqueue);
 436
 437         mutex_lock(&cdev->ncci_list_mtx);
 438         capincci_free(cdev, 0xffffffff);
 439         mutex_unlock(&cdev->ncci_list_mtx);
 440
 441         kfree(cdev);
 442 }
 443
 444 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 445 /* -------- handle data queue --------------------------------------- */
 446
 447 static struct sk_buff *
 448 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 449 {
 450         struct sk_buff *nskb;
 451         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 452         if (nskb) {
 453                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 454                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 455                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 456                 capimsg_setu16(s, 2, mp->ap->applid);
 457                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 458                 capimsg_setu8 (s, 5, CAPI_RESP);
 459                 capimsg_setu16(s, 6, mp->msgid++);
 460                 capimsg_setu32(s, 8, mp->ncci);
 461                 capimsg_setu16(s, 12, datahandle);
 462         }
 463         return nskb;
 464 }
 465
 466 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 467 {
 468         struct sk_buff *nskb;
 469         int datalen;
 470         u16 errcode, datahandle;
 471         struct tty_ldisc *ld;
 472
 473         datalen = skb->len - CAPIMSG_LEN(skb->data);
 474         if (mp->tty == NULL)
 475         {
 476 #ifdef _DEBUG_DATAFLOW
 477                 printk(KERN_DEBUG "capi: currently no receiver\n");
 478 #endif
 479                 return -1;
 480         }
 481
 482         ld = tty_ldisc_ref(mp->tty);
 483         if (ld == NULL)
 484                 return -1;
 485         if (ld->ops->receive_buf == NULL) {
 486 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 487                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 488 #endif
 489                 goto bad;
 490         }
 491         if (mp->ttyinstop) {
 492 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 493                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 494 #endif
 495                 goto bad;
 496         }
 497         if (mp->tty->receive_room < datalen) {
 498 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 499                 printk(KERN_DEBUG "capi: no room in tty\n");
 500 #endif
 501                 goto bad;
 502         }
 503         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 504                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 505                 goto bad;
 506         }
 507         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 508         errcode = capi20_put_message(mp->ap, nskb);
 509         if (errcode != CAPI_NOERROR) {
 510                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 511                                 errcode);
 512                 kfree_skb(nskb);
 513                 goto bad;
 514         }
 515         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 516 #ifdef _DEBUG_DATAFLOW
 517         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 518                                 datahandle, skb->len);
 519 #endif
 520         ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
 521         kfree_skb(skb);
 522         tty_ldisc_deref(ld);
 523         return 0;
 524 bad:
 525         tty_ldisc_deref(ld);
 526         return -1;
 527 }
 528
 529 static void handle_minor_recv(struct capiminor *mp)
 530 {
 531         struct sk_buff *skb;
 532         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 533                 unsigned int len = skb->len;
 534                 mp->inbytes -= len;
 535                 if (handle_recv_skb(mp, skb) < 0) {
 536                         skb_queue_head(&mp->inqueue, skb);
 537                         mp->inbytes += len;
 538                         return;
 539                 }
 540         }
 541 }
 542
 543 static int handle_minor_send(struct capiminor *mp)
 544 {
 545         struct sk_buff *skb;
 546         u16 len;
 547         int count = 0;
 548         u16 errcode;
 549         u16 datahandle;
 550
 551         if (mp->tty && mp->ttyoutstop) {
 552 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 553                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 554 #endif
 555                 return 0;
 556         }
 557
 558         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 559                 datahandle = mp->datahandle;
 560                 len = (u16)skb->len;
 561                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 562                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 563                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 564                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 565                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 566                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 567                 capimsg_setu16(skb->data, 6, mp->msgid++);
 568                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 569                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 570                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 571                 capimsg_setu16(skb->data, 18, datahandle);
 572                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 573
 574                 if (capiminor_add_ack(mp, datahandle) < 0) {
 575                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 576                         skb_queue_head(&mp->outqueue, skb);
 577                         return count;
 578                 }
 579                 errcode = capi20_put_message(mp->ap, skb);
 580                 if (errcode == CAPI_NOERROR) {
 581                         mp->datahandle++;
 582                         count++;
 583                         mp->outbytes -= len;
 584 #ifdef _DEBUG_DATAFLOW
 585                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 586                                                         datahandle, len);
 587 #endif
 588                         continue;
 589                 }
 590                 capiminor_del_ack(mp, datahandle);
 591
 592                 if (errcode == CAPI_SENDQUEUEFULL) {
 593                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 594                         skb_queue_head(&mp->outqueue, skb);
 595                         break;
 596                 }
 597
 598                 /* ups, drop packet */
 599                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 600                 mp->outbytes -= len;
 601                 kfree_skb(skb);
 602         }
 603         return count;
 604 }
 605
 606 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 607 /* -------- function called by lower level -------------------------- */
 608
 609 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 610 {
 611         struct capidev *cdev = ap->private;
 612 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 613         struct capiminor *mp;
 614         u16 datahandle;
 615 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 616         struct capincci *np;
 617         u32 ncci;
 618         unsigned long flags;
 619
 620         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 621                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 622                 if ((info & 0xff00) == 0) {
 623                         mutex_lock(&cdev->ncci_list_mtx);
 624                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 625                         mutex_unlock(&cdev->ncci_list_mtx);
 626                 }
 627         }
 628         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
 629                 mutex_lock(&cdev->ncci_list_mtx);
 630                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 631                 mutex_unlock(&cdev->ncci_list_mtx);
 632         }
 633         spin_lock_irqsave(&workaround_lock, flags);
 634         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 635                 skb_queue_tail(&cdev->recvqueue, skb);
 636                 wake_up_interruptible(&cdev->recvwait);
 637                 spin_unlock_irqrestore(&workaround_lock, flags);
 638                 return;
 639         }
 640         ncci = CAPIMSG_CONTROL(skb->data);
 641         for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
 642                 ;
 643         if (!np) {
 644                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 645                 skb_queue_tail(&cdev->recvqueue, skb);
 646                 wake_up_interruptible(&cdev->recvwait);
 647                 spin_unlock_irqrestore(&workaround_lock, flags);
 648                 return;
 649         }
 650
 651 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 652         skb_queue_tail(&cdev->recvqueue, skb);
 653         wake_up_interruptible(&cdev->recvwait);
 654
 655 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 656
 657         mp = np->minorp;
 658         if (!mp) {
 659                 skb_queue_tail(&cdev->recvqueue, skb);
 660                 wake_up_interruptible(&cdev->recvwait);
 661                 spin_unlock_irqrestore(&workaround_lock, flags);
 662                 return;
 663         }
 664         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 665                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 666 #ifdef _DEBUG_DATAFLOW
 667                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 668                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 669 #endif
 670                 skb_queue_tail(&mp->inqueue, skb);
 671                 mp->inbytes += skb->len;
 672                 handle_minor_recv(mp);
 673
 674         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 675
 676                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 677 #ifdef _DEBUG_DATAFLOW
 678                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 679                                 datahandle,
 680                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 681 #endif
 682                 kfree_skb(skb);
 683                 (void)capiminor_del_ack(mp, datahandle);
 684                 if (mp->tty)
 685                         tty_wakeup(mp->tty);
 686                 (void)handle_minor_send(mp);
 687
 688         } else {
 689                 /* ups, let capi application handle it :-) */
 690                 skb_queue_tail(&cdev->recvqueue, skb);
 691                 wake_up_interruptible(&cdev->recvwait);
 692         }
 693 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 694
 695         spin_unlock_irqrestore(&workaround_lock, flags);
 696 }
 697
 698 /* -------- file_operations for capidev ----------------------------- */
 699
 700 static ssize_t
 701 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 702 {
 703         struct capidev *cdev = (struct capidev *)file->private_data;
 704         struct sk_buff *skb;
 705         size_t copied;
 706
 707         if (!cdev->ap.applid)
 708                 return -ENODEV;
 709
 710         if ((skb = skb_dequeue(&cdev->recvqueue)) == NULL) {
 711
 712                 if (file->f_flags & O_NONBLOCK)
 713                         return -EAGAIN;
 714
 715                 for (;;) {
 716                         interruptible_sleep_on(&cdev->recvwait);
 717                         if ((skb = skb_dequeue(&cdev->recvqueue)) != NULL)
 718                                 break;
 719                         if (signal_pending(current))
 720                                 break;
 721                 }
 722                 if (skb == NULL)
 723                         return -ERESTARTNOHAND;
 724         }
 725         if (skb->len > count) {
 726                 skb_queue_head(&cdev->recvqueue, skb);
 727                 return -EMSGSIZE;
 728         }
 729         if (copy_to_user(buf, skb->data, skb->len)) {
 730                 skb_queue_head(&cdev->recvqueue, skb);
 731                 return -EFAULT;
 732         }
 733         copied = skb->len;
 734
 735         kfree_skb(skb);
 736
 737         return copied;
 738 }
 739
 740 static ssize_t
 741 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 742 {
 743         struct capidev *cdev = (struct capidev *)file->private_data;
 744         struct sk_buff *skb;
 745         u16 mlen;
 746
 747         if (!cdev->ap.applid)
 748                 return -ENODEV;
 749
 750         skb = alloc_skb(count, GFP_USER);
 751         if (!skb)
 752                 return -ENOMEM;
 753
 754         if (copy_from_user(skb_put(skb, count), buf, count)) {
 755                 kfree_skb(skb);
 756                 return -EFAULT;
 757         }
 758         mlen = CAPIMSG_LEN(skb->data);
 759         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 760                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 761                         kfree_skb(skb);
 762                         return -EINVAL;
 763                 }
 764         } else {
 765                 if (mlen != count) {
 766                         kfree_skb(skb);
 767                         return -EINVAL;
 768                 }
 769         }
 770         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 771
 772         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 773                 mutex_lock(&cdev->ncci_list_mtx);
 774                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 775                 mutex_unlock(&cdev->ncci_list_mtx);
 776         }
 777
 778         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 779
 780         if (cdev->errcode) {
 781                 kfree_skb(skb);
 782                 return -EIO;
 783         }
 784         return count;
 785 }
 786
 787 static unsigned int
 788 capi_poll(struct file *file, poll_table * wait)
 789 {
 790         struct capidev *cdev = (struct capidev *)file->private_data;
 791         unsigned int mask = 0;
 792
 793         if (!cdev->ap.applid)
 794                 return POLLERR;
 795
 796         poll_wait(file, &(cdev->recvwait), wait);
 797         mask = POLLOUT | POLLWRNORM;
 798         if (!skb_queue_empty(&cdev->recvqueue))
 799                 mask |= POLLIN | POLLRDNORM;
 800         return mask;
 801 }
 802
 803 static int
 804 capi_ioctl(struct inode *inode, struct file *file,
 805            unsigned int cmd, unsigned long arg)
 806 {
 807         struct capidev *cdev = file->private_data;
 808         struct capi20_appl *ap = &cdev->ap;
 809         capi_ioctl_struct data;
 810         int retval = -EINVAL;
 811         void __user *argp = (void __user *)arg;
 812
 813         switch (cmd) {
 814         case CAPI_REGISTER:
 815                 {
 816                         if (ap->applid)
 817                                 return -EEXIST;
 818
 819                         if (copy_from_user(&cdev->ap.rparam, argp,
 820                                            sizeof(struct capi_register_params)))
 821                                 return -EFAULT;
 822
 823                         cdev->ap.private = cdev;
 824                         cdev->ap.recv_message = capi_recv_message;
 825                         cdev->errcode = capi20_register(ap);
 826                         if (cdev->errcode) {
 827                                 ap->applid = 0;
 828                                 return -EIO;
 829                         }
 830                 }
 831                 return (int)ap->applid;
 832
 833         case CAPI_GET_VERSION:
 834                 {
 835                         if (copy_from_user(&data.contr, argp,
 836                                                 sizeof(data.contr)))
 837                                 return -EFAULT;
 838                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 839                         if (cdev->errcode)
 840                                 return -EIO;
 841                         if (copy_to_user(argp, &data.version,
 842                                          sizeof(data.version)))
 843                                 return -EFAULT;
 844                 }
 845                 return 0;
 846
 847         case CAPI_GET_SERIAL:
 848                 {
 849                         if (copy_from_user(&data.contr, argp,
 850                                            sizeof(data.contr)))
 851                                 return -EFAULT;
 852                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 853                         if (cdev->errcode)
 854                                 return -EIO;
 855                         if (copy_to_user(argp, data.serial,
 856                                          sizeof(data.serial)))
 857                                 return -EFAULT;
 858                 }
 859                 return 0;
 860         case CAPI_GET_PROFILE:
 861                 {
 862                         if (copy_from_user(&data.contr, argp,
 863                                            sizeof(data.contr)))
 864                                 return -EFAULT;
 865
 866                         if (data.contr == 0) {
 867                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 868                                 if (cdev->errcode)
 869                                         return -EIO;
 870
 871                                 retval = copy_to_user(argp,
 872                                       &data.profile.ncontroller,
 873                                        sizeof(data.profile.ncontroller));
 874
 875                         } else {
 876                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 877                                 if (cdev->errcode)
 878                                         return -EIO;
 879
 880                                 retval = copy_to_user(argp, &data.profile,
 881                                                    sizeof(data.profile));
 882                         }
 883                         if (retval)
 884                                 return -EFAULT;
 885                 }
 886                 return 0;
 887
 888         case CAPI_GET_MANUFACTURER:
 889                 {
 890                         if (copy_from_user(&data.contr, argp,
 891                                            sizeof(data.contr)))
 892                                 return -EFAULT;
 893                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 894                         if (cdev->errcode)
 895                                 return -EIO;
 896
 897                         if (copy_to_user(argp, data.manufacturer,
 898                                          sizeof(data.manufacturer)))
 899                                 return -EFAULT;
 900
 901                 }
 902                 return 0;
 903         case CAPI_GET_ERRCODE:
 904                 data.errcode = cdev->errcode;
 905                 cdev->errcode = CAPI_NOERROR;
 906                 if (arg) {
 907                         if (copy_to_user(argp, &data.errcode,
 908                                          sizeof(data.errcode)))
 909                                 return -EFAULT;
 910                 }
 911                 return data.errcode;
 912
 913         case CAPI_INSTALLED:
 914                 if (capi20_isinstalled() == CAPI_NOERROR)
 915                         return 0;
 916                 return -ENXIO;
 917
 918         case CAPI_MANUFACTURER_CMD:
 919                 {
 920                         struct capi_manufacturer_cmd mcmd;
 921                         if (!capable(CAP_SYS_ADMIN))
 922                                 return -EPERM;
 923                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 924                                 return -EFAULT;
 925                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 926                 }
 927                 return 0;
 928
 929         case CAPI_SET_FLAGS:
 930         case CAPI_CLR_FLAGS:
 931                 {
 932                         unsigned userflags;
 933                         if (copy_from_user(&userflags, argp,
 934                                            sizeof(userflags)))
 935                                 return -EFAULT;
 936                         if (cmd == CAPI_SET_FLAGS)
 937                                 cdev->userflags |= userflags;
 938                         else
 939                                 cdev->userflags &= ~userflags;
 940                 }
 941                 return 0;
 942
 943         case CAPI_GET_FLAGS:
 944                 if (copy_to_user(argp, &cdev->userflags,
 945                                  sizeof(cdev->userflags)))
 946                         return -EFAULT;
 947                 return 0;
 948
 949         case CAPI_NCCI_OPENCOUNT:
 950                 {
 951                         struct capincci *nccip;
 952                         unsigned ncci;
 953                         int count = 0;
 954                         if (copy_from_user(&ncci, argp, sizeof(ncci)))
 955                                 return -EFAULT;
 956
 957                         mutex_lock(&cdev->ncci_list_mtx);
 958                         if ((nccip = capincci_find(cdev, (u32) ncci)) == NULL) {
 959                                 mutex_unlock(&cdev->ncci_list_mtx);
 960                                 return 0;
 961                         }
 962                         count += capincci_minor_opencount(nccip);
 963                         mutex_unlock(&cdev->ncci_list_mtx);
 964                         return count;
 965                 }
 966                 return 0;
 967
 968 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 969         case CAPI_NCCI_GETUNIT:
 970                 {
 971                         struct capincci *nccip;
 972                         struct capiminor *mp;
 973                         unsigned ncci;
 974                         int unit = 0;
 975                         if (copy_from_user(&ncci, argp,
 976                                            sizeof(ncci)))
 977                                 return -EFAULT;
 978                         mutex_lock(&cdev->ncci_list_mtx);
 979                         nccip = capincci_find(cdev, (u32) ncci);
 980                         if (!nccip || (mp = nccip->minorp) == NULL) {
 981                                 mutex_unlock(&cdev->ncci_list_mtx);
 982                                 return -ESRCH;
 983                         }
 984                         unit = mp->minor;
 985                         mutex_unlock(&cdev->ncci_list_mtx);
 986                         return unit;
 987                 }
 988                 return 0;
 989 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 990         }
 991         return -EINVAL;
 992 }
 993
 994 static int
 995 capi_open(struct inode *inode, struct file *file)
 996 {
 997         int ret;
 998
 999         lock_kernel();
1000         if (file->private_data)
1001                 ret = -EEXIST;
1002         else if ((file->private_data = capidev_alloc()) == NULL)
1003                 ret = -ENOMEM;
1004         else
1005                 ret = nonseekable_open(inode, file);
1006         unlock_kernel();
1007         return ret;
1008 }
1009
1010 static int
1011 capi_release(struct inode *inode, struct file *file)
1012 {
1013         struct capidev *cdev = (struct capidev *)file->private_data;
1014
1015         capidev_free(cdev);
1016         file->private_data = NULL;
1017
1018         return 0;
1019 }
1020
1021 static const struct file_operations capi_fops =
1022 {
1023         .owner          = THIS_MODULE,
1024         .llseek         = no_llseek,
1025         .read           = capi_read,
1026         .write          = capi_write,
1027         .poll           = capi_poll,
1028         .ioctl          = capi_ioctl,
1029         .open           = capi_open,
1030         .release        = capi_release,
1031 };
1032
1033 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1034 /* -------- tty_operations for capincci ----------------------------- */
1035
1036 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
1037 {
1038         struct capiminor *mp;
1039         unsigned long flags;
1040
1041         if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == NULL)
1042                 return -ENXIO;
1043         if (mp->nccip == NULL)
1044                 return -ENXIO;
1045
1046         tty->driver_data = (void *)mp;
1047
1048         spin_lock_irqsave(&workaround_lock, flags);
1049         if (atomic_read(&mp->ttyopencount) == 0)
1050                 mp->tty = tty;
1051         atomic_inc(&mp->ttyopencount);
1052 #ifdef _DEBUG_REFCOUNT
1053         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1054 #endif
1055         handle_minor_recv(mp);
1056         spin_unlock_irqrestore(&workaround_lock, flags);
1057         return 0;
1058 }
1059
1060 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1061 {
1062         struct capiminor *mp;
1063
1064         mp = (struct capiminor *)tty->driver_data;
1065         if (mp) {
1066                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1067 #ifdef _DEBUG_REFCOUNT
1068                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1069 #endif
1070                         tty->driver_data = NULL;
1071                         mp->tty = NULL;
1072                 }
1073 #ifdef _DEBUG_REFCOUNT
1074                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1075 #endif
1076                 if (mp->nccip == NULL)
1077                         capiminor_free(mp);
1078         }
1079
1080 #ifdef _DEBUG_REFCOUNT
1081         printk(KERN_DEBUG "capinc_tty_close\n");
1082 #endif
1083 }
1084
1085 static int capinc_tty_write(struct tty_struct * tty,
1086                             const unsigned char *buf, int count)
1087 {
1088         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1089         struct sk_buff *skb;
1090         unsigned long flags;
1091
1092 #ifdef _DEBUG_TTYFUNCS
1093         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1094 #endif
1095
1096         if (!mp || !mp->nccip) {
1097 #ifdef _DEBUG_TTYFUNCS
1098                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1099 #endif
1100                 return 0;
1101         }
1102
1103         spin_lock_irqsave(&workaround_lock, flags);
1104         skb = mp->ttyskb;
1105         if (skb) {
1106                 mp->ttyskb = NULL;
1107                 skb_queue_tail(&mp->outqueue, skb);
1108                 mp->outbytes += skb->len;
1109         }
1110
1111         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1112         if (!skb) {
1113                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1114                 spin_unlock_irqrestore(&workaround_lock, flags);
1115                 return -ENOMEM;
1116         }
1117
1118         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1119         memcpy(skb_put(skb, count), buf, count);
1120
1121         skb_queue_tail(&mp->outqueue, skb);
1122         mp->outbytes += skb->len;
1123         (void)handle_minor_send(mp);
1124         (void)handle_minor_recv(mp);
1125         spin_unlock_irqrestore(&workaround_lock, flags);
1126         return count;
1127 }
1128
1129 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1130 {
1131         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1132         struct sk_buff *skb;
1133         unsigned long flags;
1134         int ret = 1;
1135
1136 #ifdef _DEBUG_TTYFUNCS
1137         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1138 #endif
1139
1140         if (!mp || !mp->nccip) {
1141 #ifdef _DEBUG_TTYFUNCS
1142                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1143 #endif
1144                 return 0;
1145         }
1146
1147         spin_lock_irqsave(&workaround_lock, flags);
1148         skb = mp->ttyskb;
1149         if (skb) {
1150                 if (skb_tailroom(skb) > 0) {
1151                         *(skb_put(skb, 1)) = ch;
1152                         spin_unlock_irqrestore(&workaround_lock, flags);
1153                         return 1;
1154                 }
1155                 mp->ttyskb = NULL;
1156                 skb_queue_tail(&mp->outqueue, skb);
1157                 mp->outbytes += skb->len;
1158                 (void)handle_minor_send(mp);
1159         }
1160         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1161         if (skb) {
1162                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1163                 *(skb_put(skb, 1)) = ch;
1164                 mp->ttyskb = skb;
1165         } else {
1166                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1167                 ret = 0;
1168         }
1169         spin_unlock_irqrestore(&workaround_lock, flags);
1170         return ret;
1171 }
1172
1173 static void capinc_tty_flush_chars(struct tty_struct *tty)
1174 {
1175         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1176         struct sk_buff *skb;
1177         unsigned long flags;
1178
1179 #ifdef _DEBUG_TTYFUNCS
1180         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1181 #endif
1182
1183         if (!mp || !mp->nccip) {
1184 #ifdef _DEBUG_TTYFUNCS
1185                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1186 #endif
1187                 return;
1188         }
1189
1190         spin_lock_irqsave(&workaround_lock, flags);
1191         skb = mp->ttyskb;
1192         if (skb) {
1193                 mp->ttyskb = NULL;
1194                 skb_queue_tail(&mp->outqueue, skb);
1195                 mp->outbytes += skb->len;
1196                 (void)handle_minor_send(mp);
1197         }
1198         (void)handle_minor_recv(mp);
1199         spin_unlock_irqrestore(&workaround_lock, flags);
1200 }
1201
1202 static int capinc_tty_write_room(struct tty_struct *tty)
1203 {
1204         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1205         int room;
1206         if (!mp || !mp->nccip) {
1207 #ifdef _DEBUG_TTYFUNCS
1208                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1209 #endif
1210                 return 0;
1211         }
1212         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1213         room *= CAPI_MAX_BLKSIZE;
1214 #ifdef _DEBUG_TTYFUNCS
1215         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1216 #endif
1217         return room;
1218 }
1219
1220 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1221 {
1222         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1223         if (!mp || !mp->nccip) {
1224 #ifdef _DEBUG_TTYFUNCS
1225                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1226 #endif
1227                 return 0;
1228         }
1229 #ifdef _DEBUG_TTYFUNCS
1230         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1231                         mp->outbytes, mp->nack,
1232                         skb_queue_len(&mp->outqueue),
1233                         skb_queue_len(&mp->inqueue));
1234 #endif
1235         return mp->outbytes;
1236 }
1237
1238 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1239                     unsigned int cmd, unsigned long arg)
1240 {
1241         int error = 0;
1242         switch (cmd) {
1243         default:
1244                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1245                 break;
1246         }
1247         return error;
1248 }
1249
1250 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1251 {
1252 #ifdef _DEBUG_TTYFUNCS
1253         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1254 #endif
1255 }
1256
1257 static void capinc_tty_throttle(struct tty_struct * tty)
1258 {
1259         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1260 #ifdef _DEBUG_TTYFUNCS
1261         printk(KERN_DEBUG "capinc_tty_throttle\n");
1262 #endif
1263         if (mp)
1264                 mp->ttyinstop = 1;
1265 }
1266
1267 static void capinc_tty_unthrottle(struct tty_struct * tty)
1268 {
1269         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1270         unsigned long flags;
1271 #ifdef _DEBUG_TTYFUNCS
1272         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1273 #endif
1274         if (mp) {
1275                 spin_lock_irqsave(&workaround_lock, flags);
1276                 mp->ttyinstop = 0;
1277                 handle_minor_recv(mp);
1278                 spin_unlock_irqrestore(&workaround_lock, flags);
1279         }
1280 }
1281
1282 static void capinc_tty_stop(struct tty_struct *tty)
1283 {
1284         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1285 #ifdef _DEBUG_TTYFUNCS
1286         printk(KERN_DEBUG "capinc_tty_stop\n");
1287 #endif
1288         if (mp) {
1289                 mp->ttyoutstop = 1;
1290         }
1291 }
1292
1293 static void capinc_tty_start(struct tty_struct *tty)
1294 {
1295         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1296         unsigned long flags;
1297 #ifdef _DEBUG_TTYFUNCS
1298         printk(KERN_DEBUG "capinc_tty_start\n");
1299 #endif
1300         if (mp) {
1301                 spin_lock_irqsave(&workaround_lock, flags);
1302                 mp->ttyoutstop = 0;
1303                 (void)handle_minor_send(mp);
1304                 spin_unlock_irqrestore(&workaround_lock, flags);
1305         }
1306 }
1307
1308 static void capinc_tty_hangup(struct tty_struct *tty)
1309 {
1310 #ifdef _DEBUG_TTYFUNCS
1311         printk(KERN_DEBUG "capinc_tty_hangup\n");
1312 #endif
1313 }
1314
1315 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1316 {
1317 #ifdef _DEBUG_TTYFUNCS
1318         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1319 #endif
1320         return 0;
1321 }
1322
1323 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1324 {
1325 #ifdef _DEBUG_TTYFUNCS
1326         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1327 #endif
1328 }
1329
1330 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1331 {
1332 #ifdef _DEBUG_TTYFUNCS
1333         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1334 #endif
1335 }
1336
1337 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1338 {
1339 #ifdef _DEBUG_TTYFUNCS
1340         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1341 #endif
1342 }
1343
1344 static struct tty_driver *capinc_tty_driver;
1345
1346 static const struct tty_operations capinc_ops = {
1347         .open = capinc_tty_open,
1348         .close = capinc_tty_close,
1349         .write = capinc_tty_write,
1350         .put_char = capinc_tty_put_char,
1351         .flush_chars = capinc_tty_flush_chars,
1352         .write_room = capinc_tty_write_room,
1353         .chars_in_buffer = capinc_tty_chars_in_buffer,
1354         .ioctl = capinc_tty_ioctl,
1355         .set_termios = capinc_tty_set_termios,
1356         .throttle = capinc_tty_throttle,
1357         .unthrottle = capinc_tty_unthrottle,
1358         .stop = capinc_tty_stop,
1359         .start = capinc_tty_start,
1360         .hangup = capinc_tty_hangup,
1361         .break_ctl = capinc_tty_break_ctl,
1362         .flush_buffer = capinc_tty_flush_buffer,
1363         .set_ldisc = capinc_tty_set_ldisc,
1364         .send_xchar = capinc_tty_send_xchar,
1365 };
1366
1367 static int capinc_tty_init(void)
1368 {
1369         struct tty_driver *drv;
1370
1371         if (capi_ttyminors > CAPINC_MAX_PORTS)
1372                 capi_ttyminors = CAPINC_MAX_PORTS;
1373         if (capi_ttyminors <= 0)
1374                 capi_ttyminors = CAPINC_NR_PORTS;
1375
1376         drv = alloc_tty_driver(capi_ttyminors);
1377         if (!drv)
1378                 return -ENOMEM;
1379
1380         drv->owner = THIS_MODULE;
1381         drv->driver_name = "capi_nc";
1382         drv->name = "capi";
1383         drv->major = capi_ttymajor;
1384         drv->minor_start = 0;
1385         drv->type = TTY_DRIVER_TYPE_SERIAL;
1386         drv->subtype = SERIAL_TYPE_NORMAL;
1387         drv->init_termios = tty_std_termios;
1388         drv->init_termios.c_iflag = ICRNL;
1389         drv->init_termios.c_oflag = OPOST | ONLCR;
1390         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1391         drv->init_termios.c_lflag = 0;
1392         drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1393         tty_set_operations(drv, &capinc_ops);
1394         if (tty_register_driver(drv)) {
1395                 put_tty_driver(drv);
1396                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1397                 return -1;
1398         }
1399         capinc_tty_driver = drv;
1400         return 0;
1401 }
1402
1403 static void capinc_tty_exit(void)
1404 {
1405         struct tty_driver *drv = capinc_tty_driver;
1406         int retval;
1407         if ((retval = tty_unregister_driver(drv)))
1408                 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1409         put_tty_driver(drv);
1410 }
1411
1412 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1413
1414 static inline int capinc_tty_init(void)
1415 {
1416         return 0;
1417 }
1418
1419 static inline void capinc_tty_exit(void) { }
1420
1421 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1422
1423 /* -------- /proc functions ----------------------------------------- */
1424
1425 /*
1426  * /proc/capi/capi20:
1427  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1428  */
1429 static int capi20_proc_show(struct seq_file *m, void *v)
1430 {
1431         struct capidev *cdev;
1432         struct list_head *l;
1433
1434         mutex_lock(&capidev_list_lock);
1435         list_for_each(l, &capidev_list) {
1436                 cdev = list_entry(l, struct capidev, list);
1437                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1438                         cdev->ap.applid,
1439                         cdev->ap.nrecvctlpkt,
1440                         cdev->ap.nrecvdatapkt,
1441                         cdev->ap.nsentctlpkt,
1442                         cdev->ap.nsentdatapkt);
1443         }
1444         mutex_unlock(&capidev_list_lock);
1445         return 0;
1446 }
1447
1448 static int capi20_proc_open(struct inode *inode, struct file *file)
1449 {
1450         return single_open(file, capi20_proc_show, NULL);
1451 }
1452
1453 static const struct file_operations capi20_proc_fops = {
1454         .owner          = THIS_MODULE,
1455         .open           = capi20_proc_open,
1456         .read           = seq_read,
1457         .llseek         = seq_lseek,
1458         .release        = single_release,
1459 };
1460
1461 /*
1462  * /proc/capi/capi20ncci:
1463  *  applid ncci
1464  */
1465 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1466 {
1467         struct capidev *cdev;
1468         struct capincci *np;
1469         struct list_head *l;
1470
1471         mutex_lock(&capidev_list_lock);
1472         list_for_each(l, &capidev_list) {
1473                 cdev = list_entry(l, struct capidev, list);
1474                 for (np=cdev->nccis; np; np = np->next) {
1475                         seq_printf(m, "%d 0x%x\n",
1476                                        cdev->ap.applid,
1477                                        np->ncci);
1478                 }
1479         }
1480         mutex_unlock(&capidev_list_lock);
1481         return 0;
1482 }
1483
1484 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1485 {
1486         return single_open(file, capi20ncci_proc_show, NULL);
1487 }
1488
1489 static const struct file_operations capi20ncci_proc_fops = {
1490         .owner          = THIS_MODULE,
1491         .open           = capi20ncci_proc_open,
1492         .read           = seq_read,
1493         .llseek         = seq_lseek,
1494         .release        = single_release,
1495 };
1496
1497 static void __init proc_init(void)
1498 {
1499         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1500         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1501 }
1502
1503 static void __exit proc_exit(void)
1504 {
1505         remove_proc_entry("capi/capi20", NULL);
1506         remove_proc_entry("capi/capi20ncci", NULL);
1507 }
1508
1509 /* -------- init function and module interface ---------------------- */
1510
1511
1512 static int __init capi_init(void)
1513 {
1514         const char *compileinfo;
1515         int major_ret;
1516
1517         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1518         if (major_ret < 0) {
1519                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1520                 return major_ret;
1521         }
1522         capi_class = class_create(THIS_MODULE, "capi");
1523         if (IS_ERR(capi_class)) {
1524                 unregister_chrdev(capi_major, "capi20");
1525                 return PTR_ERR(capi_class);
1526         }
1527
1528         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1529
1530         if (capinc_tty_init() < 0) {
1531                 device_destroy(capi_class, MKDEV(capi_major, 0));
1532                 class_destroy(capi_class);
1533                 unregister_chrdev(capi_major, "capi20");
1534                 return -ENOMEM;
1535         }
1536
1537         proc_init();
1538
1539 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1540         compileinfo = " (middleware+capifs)";
1541 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1542         compileinfo = " (no capifs)";
1543 #else
1544         compileinfo = " (no middleware)";
1545 #endif
1546         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1547                capi_major, compileinfo);
1548
1549         return 0;
1550 }
1551
1552 static void __exit capi_exit(void)
1553 {
1554         proc_exit();
1555
1556         device_destroy(capi_class, MKDEV(capi_major, 0));
1557         class_destroy(capi_class);
1558         unregister_chrdev(capi_major, "capi20");
1559
1560         capinc_tty_exit();
1561 }
1562
1563 module_init(capi_init);
1564 module_exit(capi_exit);