drivers/isdn/capi/capi.c

   1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
   2  *
   3  * CAPI 2.0 Interface for Linux
   4  *
   5  * Copyright 1996 by Carsten Paeth <calle@calle.de>
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/major.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/fs.h>
  20 #include <linux/signal.h>
  21 #include <linux/mutex.h>
  22 #include <linux/mm.h>
  23 #include <linux/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 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 405 /* -------- handle data queue --------------------------------------- */
 406
 407 static struct sk_buff *
 408 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 409 {
 410         struct sk_buff *nskb;
 411         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 412         if (nskb) {
 413                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 414                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 415                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 416                 capimsg_setu16(s, 2, mp->ap->applid);
 417                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 418                 capimsg_setu8 (s, 5, CAPI_RESP);
 419                 capimsg_setu16(s, 6, mp->msgid++);
 420                 capimsg_setu32(s, 8, mp->ncci);
 421                 capimsg_setu16(s, 12, datahandle);
 422         }
 423         return nskb;
 424 }
 425
 426 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 427 {
 428         struct sk_buff *nskb;
 429         int datalen;
 430         u16 errcode, datahandle;
 431         struct tty_ldisc *ld;
 432
 433         datalen = skb->len - CAPIMSG_LEN(skb->data);
 434         if (mp->tty == NULL)
 435         {
 436 #ifdef _DEBUG_DATAFLOW
 437                 printk(KERN_DEBUG "capi: currently no receiver\n");
 438 #endif
 439                 return -1;
 440         }
 441
 442         ld = tty_ldisc_ref(mp->tty);
 443         if (ld == NULL)
 444                 return -1;
 445         if (ld->ops->receive_buf == NULL) {
 446 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 447                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 448 #endif
 449                 goto bad;
 450         }
 451         if (mp->ttyinstop) {
 452 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 453                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 454 #endif
 455                 goto bad;
 456         }
 457         if (mp->tty->receive_room < datalen) {
 458 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 459                 printk(KERN_DEBUG "capi: no room in tty\n");
 460 #endif
 461                 goto bad;
 462         }
 463         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 464                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 465                 goto bad;
 466         }
 467         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 468         errcode = capi20_put_message(mp->ap, nskb);
 469         if (errcode != CAPI_NOERROR) {
 470                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 471                                 errcode);
 472                 kfree_skb(nskb);
 473                 goto bad;
 474         }
 475         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 476 #ifdef _DEBUG_DATAFLOW
 477         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 478                                 datahandle, skb->len);
 479 #endif
 480         ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
 481         kfree_skb(skb);
 482         tty_ldisc_deref(ld);
 483         return 0;
 484 bad:
 485         tty_ldisc_deref(ld);
 486         return -1;
 487 }
 488
 489 static void handle_minor_recv(struct capiminor *mp)
 490 {
 491         struct sk_buff *skb;
 492         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 493                 unsigned int len = skb->len;
 494                 mp->inbytes -= len;
 495                 if (handle_recv_skb(mp, skb) < 0) {
 496                         skb_queue_head(&mp->inqueue, skb);
 497                         mp->inbytes += len;
 498                         return;
 499                 }
 500         }
 501 }
 502
 503 static int handle_minor_send(struct capiminor *mp)
 504 {
 505         struct sk_buff *skb;
 506         u16 len;
 507         int count = 0;
 508         u16 errcode;
 509         u16 datahandle;
 510
 511         if (mp->tty && mp->ttyoutstop) {
 512 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 513                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 514 #endif
 515                 return 0;
 516         }
 517
 518         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 519                 datahandle = mp->datahandle;
 520                 len = (u16)skb->len;
 521                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 522                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 523                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 524                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 525                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 526                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 527                 capimsg_setu16(skb->data, 6, mp->msgid++);
 528                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 529                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 530                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 531                 capimsg_setu16(skb->data, 18, datahandle);
 532                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 533
 534                 if (capiminor_add_ack(mp, datahandle) < 0) {
 535                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 536                         skb_queue_head(&mp->outqueue, skb);
 537                         return count;
 538                 }
 539                 errcode = capi20_put_message(mp->ap, skb);
 540                 if (errcode == CAPI_NOERROR) {
 541                         mp->datahandle++;
 542                         count++;
 543                         mp->outbytes -= len;
 544 #ifdef _DEBUG_DATAFLOW
 545                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 546                                                         datahandle, len);
 547 #endif
 548                         continue;
 549                 }
 550                 capiminor_del_ack(mp, datahandle);
 551
 552                 if (errcode == CAPI_SENDQUEUEFULL) {
 553                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 554                         skb_queue_head(&mp->outqueue, skb);
 555                         break;
 556                 }
 557
 558                 /* ups, drop packet */
 559                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 560                 mp->outbytes -= len;
 561                 kfree_skb(skb);
 562         }
 563         return count;
 564 }
 565
 566 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 567 /* -------- function called by lower level -------------------------- */
 568
 569 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 570 {
 571         struct capidev *cdev = ap->private;
 572 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 573         struct capiminor *mp;
 574         u16 datahandle;
 575 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 576         struct capincci *np;
 577         u32 ncci;
 578         unsigned long flags;
 579
 580         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 581                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 582                 if ((info & 0xff00) == 0) {
 583                         mutex_lock(&cdev->ncci_list_mtx);
 584                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 585                         mutex_unlock(&cdev->ncci_list_mtx);
 586                 }
 587         }
 588         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
 589                 mutex_lock(&cdev->ncci_list_mtx);
 590                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 591                 mutex_unlock(&cdev->ncci_list_mtx);
 592         }
 593         spin_lock_irqsave(&workaround_lock, flags);
 594         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 595                 skb_queue_tail(&cdev->recvqueue, skb);
 596                 wake_up_interruptible(&cdev->recvwait);
 597                 spin_unlock_irqrestore(&workaround_lock, flags);
 598                 return;
 599         }
 600         ncci = CAPIMSG_CONTROL(skb->data);
 601         for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
 602                 ;
 603         if (!np) {
 604                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 605                 skb_queue_tail(&cdev->recvqueue, skb);
 606                 wake_up_interruptible(&cdev->recvwait);
 607                 spin_unlock_irqrestore(&workaround_lock, flags);
 608                 return;
 609         }
 610
 611 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 612         skb_queue_tail(&cdev->recvqueue, skb);
 613         wake_up_interruptible(&cdev->recvwait);
 614
 615 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 616
 617         mp = np->minorp;
 618         if (!mp) {
 619                 skb_queue_tail(&cdev->recvqueue, skb);
 620                 wake_up_interruptible(&cdev->recvwait);
 621                 spin_unlock_irqrestore(&workaround_lock, flags);
 622                 return;
 623         }
 624         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 625                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 626 #ifdef _DEBUG_DATAFLOW
 627                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 628                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 629 #endif
 630                 skb_queue_tail(&mp->inqueue, skb);
 631                 mp->inbytes += skb->len;
 632                 handle_minor_recv(mp);
 633
 634         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 635
 636                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 637 #ifdef _DEBUG_DATAFLOW
 638                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 639                                 datahandle,
 640                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 641 #endif
 642                 kfree_skb(skb);
 643                 (void)capiminor_del_ack(mp, datahandle);
 644                 if (mp->tty)
 645                         tty_wakeup(mp->tty);
 646                 (void)handle_minor_send(mp);
 647
 648         } else {
 649                 /* ups, let capi application handle it :-) */
 650                 skb_queue_tail(&cdev->recvqueue, skb);
 651                 wake_up_interruptible(&cdev->recvwait);
 652         }
 653 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 654
 655         spin_unlock_irqrestore(&workaround_lock, flags);
 656 }
 657
 658 /* -------- file_operations for capidev ----------------------------- */
 659
 660 static ssize_t
 661 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 662 {
 663         struct capidev *cdev = (struct capidev *)file->private_data;
 664         struct sk_buff *skb;
 665         size_t copied;
 666
 667         if (!cdev->ap.applid)
 668                 return -ENODEV;
 669
 670         if ((skb = skb_dequeue(&cdev->recvqueue)) == NULL) {
 671
 672                 if (file->f_flags & O_NONBLOCK)
 673                         return -EAGAIN;
 674
 675                 for (;;) {
 676                         interruptible_sleep_on(&cdev->recvwait);
 677                         if ((skb = skb_dequeue(&cdev->recvqueue)) != NULL)
 678                                 break;
 679                         if (signal_pending(current))
 680                                 break;
 681                 }
 682                 if (skb == NULL)
 683                         return -ERESTARTNOHAND;
 684         }
 685         if (skb->len > count) {
 686                 skb_queue_head(&cdev->recvqueue, skb);
 687                 return -EMSGSIZE;
 688         }
 689         if (copy_to_user(buf, skb->data, skb->len)) {
 690                 skb_queue_head(&cdev->recvqueue, skb);
 691                 return -EFAULT;
 692         }
 693         copied = skb->len;
 694
 695         kfree_skb(skb);
 696
 697         return copied;
 698 }
 699
 700 static ssize_t
 701 capi_write(struct file *file, const 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         u16 mlen;
 706
 707         if (!cdev->ap.applid)
 708                 return -ENODEV;
 709
 710         skb = alloc_skb(count, GFP_USER);
 711         if (!skb)
 712                 return -ENOMEM;
 713
 714         if (copy_from_user(skb_put(skb, count), buf, count)) {
 715                 kfree_skb(skb);
 716                 return -EFAULT;
 717         }
 718         mlen = CAPIMSG_LEN(skb->data);
 719         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 720                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 721                         kfree_skb(skb);
 722                         return -EINVAL;
 723                 }
 724         } else {
 725                 if (mlen != count) {
 726                         kfree_skb(skb);
 727                         return -EINVAL;
 728                 }
 729         }
 730         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 731
 732         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 733                 mutex_lock(&cdev->ncci_list_mtx);
 734                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 735                 mutex_unlock(&cdev->ncci_list_mtx);
 736         }
 737
 738         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 739
 740         if (cdev->errcode) {
 741                 kfree_skb(skb);
 742                 return -EIO;
 743         }
 744         return count;
 745 }
 746
 747 static unsigned int
 748 capi_poll(struct file *file, poll_table * wait)
 749 {
 750         struct capidev *cdev = (struct capidev *)file->private_data;
 751         unsigned int mask = 0;
 752
 753         if (!cdev->ap.applid)
 754                 return POLLERR;
 755
 756         poll_wait(file, &(cdev->recvwait), wait);
 757         mask = POLLOUT | POLLWRNORM;
 758         if (!skb_queue_empty(&cdev->recvqueue))
 759                 mask |= POLLIN | POLLRDNORM;
 760         return mask;
 761 }
 762
 763 static int
 764 capi_ioctl(struct inode *inode, struct file *file,
 765            unsigned int cmd, unsigned long arg)
 766 {
 767         struct capidev *cdev = file->private_data;
 768         struct capi20_appl *ap = &cdev->ap;
 769         capi_ioctl_struct data;
 770         int retval = -EINVAL;
 771         void __user *argp = (void __user *)arg;
 772
 773         switch (cmd) {
 774         case CAPI_REGISTER:
 775                 {
 776                         if (ap->applid)
 777                                 return -EEXIST;
 778
 779                         if (copy_from_user(&cdev->ap.rparam, argp,
 780                                            sizeof(struct capi_register_params)))
 781                                 return -EFAULT;
 782
 783                         cdev->ap.private = cdev;
 784                         cdev->ap.recv_message = capi_recv_message;
 785                         cdev->errcode = capi20_register(ap);
 786                         if (cdev->errcode) {
 787                                 ap->applid = 0;
 788                                 return -EIO;
 789                         }
 790                 }
 791                 return (int)ap->applid;
 792
 793         case CAPI_GET_VERSION:
 794                 {
 795                         if (copy_from_user(&data.contr, argp,
 796                                                 sizeof(data.contr)))
 797                                 return -EFAULT;
 798                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 799                         if (cdev->errcode)
 800                                 return -EIO;
 801                         if (copy_to_user(argp, &data.version,
 802                                          sizeof(data.version)))
 803                                 return -EFAULT;
 804                 }
 805                 return 0;
 806
 807         case CAPI_GET_SERIAL:
 808                 {
 809                         if (copy_from_user(&data.contr, argp,
 810                                            sizeof(data.contr)))
 811                                 return -EFAULT;
 812                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 813                         if (cdev->errcode)
 814                                 return -EIO;
 815                         if (copy_to_user(argp, data.serial,
 816                                          sizeof(data.serial)))
 817                                 return -EFAULT;
 818                 }
 819                 return 0;
 820         case CAPI_GET_PROFILE:
 821                 {
 822                         if (copy_from_user(&data.contr, argp,
 823                                            sizeof(data.contr)))
 824                                 return -EFAULT;
 825
 826                         if (data.contr == 0) {
 827                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 828                                 if (cdev->errcode)
 829                                         return -EIO;
 830
 831                                 retval = copy_to_user(argp,
 832                                       &data.profile.ncontroller,
 833                                        sizeof(data.profile.ncontroller));
 834
 835                         } else {
 836                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 837                                 if (cdev->errcode)
 838                                         return -EIO;
 839
 840                                 retval = copy_to_user(argp, &data.profile,
 841                                                    sizeof(data.profile));
 842                         }
 843                         if (retval)
 844                                 return -EFAULT;
 845                 }
 846                 return 0;
 847
 848         case CAPI_GET_MANUFACTURER:
 849                 {
 850                         if (copy_from_user(&data.contr, argp,
 851                                            sizeof(data.contr)))
 852                                 return -EFAULT;
 853                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 854                         if (cdev->errcode)
 855                                 return -EIO;
 856
 857                         if (copy_to_user(argp, data.manufacturer,
 858                                          sizeof(data.manufacturer)))
 859                                 return -EFAULT;
 860
 861                 }
 862                 return 0;
 863         case CAPI_GET_ERRCODE:
 864                 data.errcode = cdev->errcode;
 865                 cdev->errcode = CAPI_NOERROR;
 866                 if (arg) {
 867                         if (copy_to_user(argp, &data.errcode,
 868                                          sizeof(data.errcode)))
 869                                 return -EFAULT;
 870                 }
 871                 return data.errcode;
 872
 873         case CAPI_INSTALLED:
 874                 if (capi20_isinstalled() == CAPI_NOERROR)
 875                         return 0;
 876                 return -ENXIO;
 877
 878         case CAPI_MANUFACTURER_CMD:
 879                 {
 880                         struct capi_manufacturer_cmd mcmd;
 881                         if (!capable(CAP_SYS_ADMIN))
 882                                 return -EPERM;
 883                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 884                                 return -EFAULT;
 885                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 886                 }
 887                 return 0;
 888
 889         case CAPI_SET_FLAGS:
 890         case CAPI_CLR_FLAGS:
 891                 {
 892                         unsigned userflags;
 893                         if (copy_from_user(&userflags, argp,
 894                                            sizeof(userflags)))
 895                                 return -EFAULT;
 896                         if (cmd == CAPI_SET_FLAGS)
 897                                 cdev->userflags |= userflags;
 898                         else
 899                                 cdev->userflags &= ~userflags;
 900                 }
 901                 return 0;
 902
 903         case CAPI_GET_FLAGS:
 904                 if (copy_to_user(argp, &cdev->userflags,
 905                                  sizeof(cdev->userflags)))
 906                         return -EFAULT;
 907                 return 0;
 908
 909         case CAPI_NCCI_OPENCOUNT:
 910                 {
 911                         struct capincci *nccip;
 912                         unsigned ncci;
 913                         int count = 0;
 914                         if (copy_from_user(&ncci, argp, sizeof(ncci)))
 915                                 return -EFAULT;
 916
 917                         mutex_lock(&cdev->ncci_list_mtx);
 918                         if ((nccip = capincci_find(cdev, (u32) ncci)) == NULL) {
 919                                 mutex_unlock(&cdev->ncci_list_mtx);
 920                                 return 0;
 921                         }
 922                         count += capincci_minor_opencount(nccip);
 923                         mutex_unlock(&cdev->ncci_list_mtx);
 924                         return count;
 925                 }
 926                 return 0;
 927
 928 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 929         case CAPI_NCCI_GETUNIT:
 930                 {
 931                         struct capincci *nccip;
 932                         struct capiminor *mp;
 933                         unsigned ncci;
 934                         int unit = 0;
 935                         if (copy_from_user(&ncci, argp,
 936                                            sizeof(ncci)))
 937                                 return -EFAULT;
 938                         mutex_lock(&cdev->ncci_list_mtx);
 939                         nccip = capincci_find(cdev, (u32) ncci);
 940                         if (!nccip || (mp = nccip->minorp) == NULL) {
 941                                 mutex_unlock(&cdev->ncci_list_mtx);
 942                                 return -ESRCH;
 943                         }
 944                         unit = mp->minor;
 945                         mutex_unlock(&cdev->ncci_list_mtx);
 946                         return unit;
 947                 }
 948                 return 0;
 949 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 950         }
 951         return -EINVAL;
 952 }
 953
 954 static int capi_open(struct inode *inode, struct file *file)
 955 {
 956         struct capidev *cdev;
 957
 958         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 959         if (!cdev)
 960                 return -ENOMEM;
 961
 962         mutex_init(&cdev->ncci_list_mtx);
 963         skb_queue_head_init(&cdev->recvqueue);
 964         init_waitqueue_head(&cdev->recvwait);
 965         file->private_data = cdev;
 966
 967         mutex_lock(&capidev_list_lock);
 968         list_add_tail(&cdev->list, &capidev_list);
 969         mutex_unlock(&capidev_list_lock);
 970
 971         return nonseekable_open(inode, file);
 972 }
 973
 974 static int capi_release(struct inode *inode, struct file *file)
 975 {
 976         struct capidev *cdev = file->private_data;
 977
 978         mutex_lock(&capidev_list_lock);
 979         list_del(&cdev->list);
 980         mutex_unlock(&capidev_list_lock);
 981
 982         if (cdev->ap.applid) {
 983                 capi20_release(&cdev->ap);
 984                 cdev->ap.applid = 0;
 985         }
 986         skb_queue_purge(&cdev->recvqueue);
 987
 988         mutex_lock(&cdev->ncci_list_mtx);
 989         capincci_free(cdev, 0xffffffff);
 990         mutex_unlock(&cdev->ncci_list_mtx);
 991
 992         kfree(cdev);
 993         return 0;
 994 }
 995
 996 static const struct file_operations capi_fops =
 997 {
 998         .owner          = THIS_MODULE,
 999         .llseek         = no_llseek,
1000         .read           = capi_read,
1001         .write          = capi_write,
1002         .poll           = capi_poll,
1003         .ioctl          = capi_ioctl,
1004         .open           = capi_open,
1005         .release        = capi_release,
1006 };
1007
1008 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1009 /* -------- tty_operations for capincci ----------------------------- */
1010
1011 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
1012 {
1013         struct capiminor *mp;
1014         unsigned long flags;
1015
1016         if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == NULL)
1017                 return -ENXIO;
1018         if (mp->nccip == NULL)
1019                 return -ENXIO;
1020
1021         tty->driver_data = (void *)mp;
1022
1023         spin_lock_irqsave(&workaround_lock, flags);
1024         if (atomic_read(&mp->ttyopencount) == 0)
1025                 mp->tty = tty;
1026         atomic_inc(&mp->ttyopencount);
1027 #ifdef _DEBUG_REFCOUNT
1028         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1029 #endif
1030         handle_minor_recv(mp);
1031         spin_unlock_irqrestore(&workaround_lock, flags);
1032         return 0;
1033 }
1034
1035 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1036 {
1037         struct capiminor *mp;
1038
1039         mp = (struct capiminor *)tty->driver_data;
1040         if (mp) {
1041                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1042 #ifdef _DEBUG_REFCOUNT
1043                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1044 #endif
1045                         tty->driver_data = NULL;
1046                         mp->tty = NULL;
1047                 }
1048 #ifdef _DEBUG_REFCOUNT
1049                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1050 #endif
1051                 if (mp->nccip == NULL)
1052                         capiminor_free(mp);
1053         }
1054
1055 #ifdef _DEBUG_REFCOUNT
1056         printk(KERN_DEBUG "capinc_tty_close\n");
1057 #endif
1058 }
1059
1060 static int capinc_tty_write(struct tty_struct * tty,
1061                             const unsigned char *buf, int count)
1062 {
1063         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1064         struct sk_buff *skb;
1065         unsigned long flags;
1066
1067 #ifdef _DEBUG_TTYFUNCS
1068         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1069 #endif
1070
1071         if (!mp || !mp->nccip) {
1072 #ifdef _DEBUG_TTYFUNCS
1073                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1074 #endif
1075                 return 0;
1076         }
1077
1078         spin_lock_irqsave(&workaround_lock, flags);
1079         skb = mp->ttyskb;
1080         if (skb) {
1081                 mp->ttyskb = NULL;
1082                 skb_queue_tail(&mp->outqueue, skb);
1083                 mp->outbytes += skb->len;
1084         }
1085
1086         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1087         if (!skb) {
1088                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1089                 spin_unlock_irqrestore(&workaround_lock, flags);
1090                 return -ENOMEM;
1091         }
1092
1093         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1094         memcpy(skb_put(skb, count), buf, count);
1095
1096         skb_queue_tail(&mp->outqueue, skb);
1097         mp->outbytes += skb->len;
1098         (void)handle_minor_send(mp);
1099         (void)handle_minor_recv(mp);
1100         spin_unlock_irqrestore(&workaround_lock, flags);
1101         return count;
1102 }
1103
1104 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1105 {
1106         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1107         struct sk_buff *skb;
1108         unsigned long flags;
1109         int ret = 1;
1110
1111 #ifdef _DEBUG_TTYFUNCS
1112         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1113 #endif
1114
1115         if (!mp || !mp->nccip) {
1116 #ifdef _DEBUG_TTYFUNCS
1117                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1118 #endif
1119                 return 0;
1120         }
1121
1122         spin_lock_irqsave(&workaround_lock, flags);
1123         skb = mp->ttyskb;
1124         if (skb) {
1125                 if (skb_tailroom(skb) > 0) {
1126                         *(skb_put(skb, 1)) = ch;
1127                         spin_unlock_irqrestore(&workaround_lock, flags);
1128                         return 1;
1129                 }
1130                 mp->ttyskb = NULL;
1131                 skb_queue_tail(&mp->outqueue, skb);
1132                 mp->outbytes += skb->len;
1133                 (void)handle_minor_send(mp);
1134         }
1135         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1136         if (skb) {
1137                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1138                 *(skb_put(skb, 1)) = ch;
1139                 mp->ttyskb = skb;
1140         } else {
1141                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1142                 ret = 0;
1143         }
1144         spin_unlock_irqrestore(&workaround_lock, flags);
1145         return ret;
1146 }
1147
1148 static void capinc_tty_flush_chars(struct tty_struct *tty)
1149 {
1150         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1151         struct sk_buff *skb;
1152         unsigned long flags;
1153
1154 #ifdef _DEBUG_TTYFUNCS
1155         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1156 #endif
1157
1158         if (!mp || !mp->nccip) {
1159 #ifdef _DEBUG_TTYFUNCS
1160                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1161 #endif
1162                 return;
1163         }
1164
1165         spin_lock_irqsave(&workaround_lock, flags);
1166         skb = mp->ttyskb;
1167         if (skb) {
1168                 mp->ttyskb = NULL;
1169                 skb_queue_tail(&mp->outqueue, skb);
1170                 mp->outbytes += skb->len;
1171                 (void)handle_minor_send(mp);
1172         }
1173         (void)handle_minor_recv(mp);
1174         spin_unlock_irqrestore(&workaround_lock, flags);
1175 }
1176
1177 static int capinc_tty_write_room(struct tty_struct *tty)
1178 {
1179         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1180         int room;
1181         if (!mp || !mp->nccip) {
1182 #ifdef _DEBUG_TTYFUNCS
1183                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1184 #endif
1185                 return 0;
1186         }
1187         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1188         room *= CAPI_MAX_BLKSIZE;
1189 #ifdef _DEBUG_TTYFUNCS
1190         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1191 #endif
1192         return room;
1193 }
1194
1195 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1196 {
1197         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1198         if (!mp || !mp->nccip) {
1199 #ifdef _DEBUG_TTYFUNCS
1200                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1201 #endif
1202                 return 0;
1203         }
1204 #ifdef _DEBUG_TTYFUNCS
1205         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1206                         mp->outbytes, mp->nack,
1207                         skb_queue_len(&mp->outqueue),
1208                         skb_queue_len(&mp->inqueue));
1209 #endif
1210         return mp->outbytes;
1211 }
1212
1213 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1214                     unsigned int cmd, unsigned long arg)
1215 {
1216         int error = 0;
1217         switch (cmd) {
1218         default:
1219                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1220                 break;
1221         }
1222         return error;
1223 }
1224
1225 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1226 {
1227 #ifdef _DEBUG_TTYFUNCS
1228         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1229 #endif
1230 }
1231
1232 static void capinc_tty_throttle(struct tty_struct * tty)
1233 {
1234         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1235 #ifdef _DEBUG_TTYFUNCS
1236         printk(KERN_DEBUG "capinc_tty_throttle\n");
1237 #endif
1238         if (mp)
1239                 mp->ttyinstop = 1;
1240 }
1241
1242 static void capinc_tty_unthrottle(struct tty_struct * tty)
1243 {
1244         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1245         unsigned long flags;
1246 #ifdef _DEBUG_TTYFUNCS
1247         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1248 #endif
1249         if (mp) {
1250                 spin_lock_irqsave(&workaround_lock, flags);
1251                 mp->ttyinstop = 0;
1252                 handle_minor_recv(mp);
1253                 spin_unlock_irqrestore(&workaround_lock, flags);
1254         }
1255 }
1256
1257 static void capinc_tty_stop(struct tty_struct *tty)
1258 {
1259         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1260 #ifdef _DEBUG_TTYFUNCS
1261         printk(KERN_DEBUG "capinc_tty_stop\n");
1262 #endif
1263         if (mp) {
1264                 mp->ttyoutstop = 1;
1265         }
1266 }
1267
1268 static void capinc_tty_start(struct tty_struct *tty)
1269 {
1270         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1271         unsigned long flags;
1272 #ifdef _DEBUG_TTYFUNCS
1273         printk(KERN_DEBUG "capinc_tty_start\n");
1274 #endif
1275         if (mp) {
1276                 spin_lock_irqsave(&workaround_lock, flags);
1277                 mp->ttyoutstop = 0;
1278                 (void)handle_minor_send(mp);
1279                 spin_unlock_irqrestore(&workaround_lock, flags);
1280         }
1281 }
1282
1283 static void capinc_tty_hangup(struct tty_struct *tty)
1284 {
1285 #ifdef _DEBUG_TTYFUNCS
1286         printk(KERN_DEBUG "capinc_tty_hangup\n");
1287 #endif
1288 }
1289
1290 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1291 {
1292 #ifdef _DEBUG_TTYFUNCS
1293         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1294 #endif
1295         return 0;
1296 }
1297
1298 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1299 {
1300 #ifdef _DEBUG_TTYFUNCS
1301         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1302 #endif
1303 }
1304
1305 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1306 {
1307 #ifdef _DEBUG_TTYFUNCS
1308         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1309 #endif
1310 }
1311
1312 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1313 {
1314 #ifdef _DEBUG_TTYFUNCS
1315         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1316 #endif
1317 }
1318
1319 static struct tty_driver *capinc_tty_driver;
1320
1321 static const struct tty_operations capinc_ops = {
1322         .open = capinc_tty_open,
1323         .close = capinc_tty_close,
1324         .write = capinc_tty_write,
1325         .put_char = capinc_tty_put_char,
1326         .flush_chars = capinc_tty_flush_chars,
1327         .write_room = capinc_tty_write_room,
1328         .chars_in_buffer = capinc_tty_chars_in_buffer,
1329         .ioctl = capinc_tty_ioctl,
1330         .set_termios = capinc_tty_set_termios,
1331         .throttle = capinc_tty_throttle,
1332         .unthrottle = capinc_tty_unthrottle,
1333         .stop = capinc_tty_stop,
1334         .start = capinc_tty_start,
1335         .hangup = capinc_tty_hangup,
1336         .break_ctl = capinc_tty_break_ctl,
1337         .flush_buffer = capinc_tty_flush_buffer,
1338         .set_ldisc = capinc_tty_set_ldisc,
1339         .send_xchar = capinc_tty_send_xchar,
1340 };
1341
1342 static int capinc_tty_init(void)
1343 {
1344         struct tty_driver *drv;
1345
1346         if (capi_ttyminors > CAPINC_MAX_PORTS)
1347                 capi_ttyminors = CAPINC_MAX_PORTS;
1348         if (capi_ttyminors <= 0)
1349                 capi_ttyminors = CAPINC_NR_PORTS;
1350
1351         drv = alloc_tty_driver(capi_ttyminors);
1352         if (!drv)
1353                 return -ENOMEM;
1354
1355         drv->owner = THIS_MODULE;
1356         drv->driver_name = "capi_nc";
1357         drv->name = "capi";
1358         drv->major = capi_ttymajor;
1359         drv->minor_start = 0;
1360         drv->type = TTY_DRIVER_TYPE_SERIAL;
1361         drv->subtype = SERIAL_TYPE_NORMAL;
1362         drv->init_termios = tty_std_termios;
1363         drv->init_termios.c_iflag = ICRNL;
1364         drv->init_termios.c_oflag = OPOST | ONLCR;
1365         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1366         drv->init_termios.c_lflag = 0;
1367         drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
1368         tty_set_operations(drv, &capinc_ops);
1369         if (tty_register_driver(drv)) {
1370                 put_tty_driver(drv);
1371                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1372                 return -1;
1373         }
1374         capinc_tty_driver = drv;
1375         return 0;
1376 }
1377
1378 static void capinc_tty_exit(void)
1379 {
1380         struct tty_driver *drv = capinc_tty_driver;
1381         int retval;
1382         if ((retval = tty_unregister_driver(drv)))
1383                 printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
1384         put_tty_driver(drv);
1385 }
1386
1387 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1388
1389 static inline int capinc_tty_init(void)
1390 {
1391         return 0;
1392 }
1393
1394 static inline void capinc_tty_exit(void) { }
1395
1396 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1397
1398 /* -------- /proc functions ----------------------------------------- */
1399
1400 /*
1401  * /proc/capi/capi20:
1402  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1403  */
1404 static int capi20_proc_show(struct seq_file *m, void *v)
1405 {
1406         struct capidev *cdev;
1407         struct list_head *l;
1408
1409         mutex_lock(&capidev_list_lock);
1410         list_for_each(l, &capidev_list) {
1411                 cdev = list_entry(l, struct capidev, list);
1412                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1413                         cdev->ap.applid,
1414                         cdev->ap.nrecvctlpkt,
1415                         cdev->ap.nrecvdatapkt,
1416                         cdev->ap.nsentctlpkt,
1417                         cdev->ap.nsentdatapkt);
1418         }
1419         mutex_unlock(&capidev_list_lock);
1420         return 0;
1421 }
1422
1423 static int capi20_proc_open(struct inode *inode, struct file *file)
1424 {
1425         return single_open(file, capi20_proc_show, NULL);
1426 }
1427
1428 static const struct file_operations capi20_proc_fops = {
1429         .owner          = THIS_MODULE,
1430         .open           = capi20_proc_open,
1431         .read           = seq_read,
1432         .llseek         = seq_lseek,
1433         .release        = single_release,
1434 };
1435
1436 /*
1437  * /proc/capi/capi20ncci:
1438  *  applid ncci
1439  */
1440 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1441 {
1442         struct capidev *cdev;
1443         struct capincci *np;
1444         struct list_head *l;
1445
1446         mutex_lock(&capidev_list_lock);
1447         list_for_each(l, &capidev_list) {
1448                 cdev = list_entry(l, struct capidev, list);
1449                 for (np=cdev->nccis; np; np = np->next) {
1450                         seq_printf(m, "%d 0x%x\n",
1451                                        cdev->ap.applid,
1452                                        np->ncci);
1453                 }
1454         }
1455         mutex_unlock(&capidev_list_lock);
1456         return 0;
1457 }
1458
1459 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1460 {
1461         return single_open(file, capi20ncci_proc_show, NULL);
1462 }
1463
1464 static const struct file_operations capi20ncci_proc_fops = {
1465         .owner          = THIS_MODULE,
1466         .open           = capi20ncci_proc_open,
1467         .read           = seq_read,
1468         .llseek         = seq_lseek,
1469         .release        = single_release,
1470 };
1471
1472 static void __init proc_init(void)
1473 {
1474         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1475         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1476 }
1477
1478 static void __exit proc_exit(void)
1479 {
1480         remove_proc_entry("capi/capi20", NULL);
1481         remove_proc_entry("capi/capi20ncci", NULL);
1482 }
1483
1484 /* -------- init function and module interface ---------------------- */
1485
1486
1487 static int __init capi_init(void)
1488 {
1489         const char *compileinfo;
1490         int major_ret;
1491
1492         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1493         if (major_ret < 0) {
1494                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1495                 return major_ret;
1496         }
1497         capi_class = class_create(THIS_MODULE, "capi");
1498         if (IS_ERR(capi_class)) {
1499                 unregister_chrdev(capi_major, "capi20");
1500                 return PTR_ERR(capi_class);
1501         }
1502
1503         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1504
1505         if (capinc_tty_init() < 0) {
1506                 device_destroy(capi_class, MKDEV(capi_major, 0));
1507                 class_destroy(capi_class);
1508                 unregister_chrdev(capi_major, "capi20");
1509                 return -ENOMEM;
1510         }
1511
1512         proc_init();
1513
1514 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1515         compileinfo = " (middleware+capifs)";
1516 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1517         compileinfo = " (no capifs)";
1518 #else
1519         compileinfo = " (no middleware)";
1520 #endif
1521         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1522                capi_major, compileinfo);
1523
1524         return 0;
1525 }
1526
1527 static void __exit capi_exit(void)
1528 {
1529         proc_exit();
1530
1531         device_destroy(capi_class, MKDEV(capi_major, 0));
1532         class_destroy(capi_class);
1533         unregister_chrdev(capi_major, "capi20");
1534
1535         capinc_tty_exit();
1536 }
1537
1538 module_init(capi_init);
1539 module_exit(capi_exit);