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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 capincci  *nccip;
  89         unsigned int      minor;
  90         struct dentry *capifs_dentry;
  91
  92         struct capi20_appl *ap;
  93         u32              ncci;
  94         u16              datahandle;
  95         u16              msgid;
  96
  97         struct tty_struct *tty;
  98         int                ttyinstop;
  99         int                ttyoutstop;
 100         struct sk_buff    *ttyskb;
 101         atomic_t           ttyopencount;
 102
 103         struct sk_buff_head inqueue;
 104         int                 inbytes;
 105         struct sk_buff_head outqueue;
 106         int                 outbytes;
 107
 108         /* transmit path */
 109         struct list_head ackqueue;
 110         int nack;
 111         spinlock_t ackqlock;
 112 };
 113
 114 /* FIXME: The following lock is a sledgehammer-workaround to a
 115  * locking issue with the capiminor (and maybe other) data structure(s).
 116  * Access to this data is done in a racy way and crashes the machine with
 117  * a FritzCard DSL driver; sooner or later. This is a workaround
 118  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 119  * The correct (and scalable) fix for the issue seems to require
 120  * an API change to the drivers... . */
 121 static DEFINE_SPINLOCK(workaround_lock);
 122
 123 struct capincci {
 124         struct list_head list;
 125         u32              ncci;
 126         struct capidev  *cdev;
 127 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 128         struct capiminor *minorp;
 129 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 130 };
 131
 132 struct capidev {
 133         struct list_head list;
 134         struct capi20_appl ap;
 135         u16             errcode;
 136         unsigned        userflags;
 137
 138         struct sk_buff_head recvqueue;
 139         wait_queue_head_t recvwait;
 140
 141         struct list_head nccis;
 142
 143         struct mutex lock;
 144 };
 145
 146 /* -------- global variables ---------------------------------------- */
 147
 148 static DEFINE_MUTEX(capidev_list_lock);
 149 static LIST_HEAD(capidev_list);
 150
 151 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 152
 153 static DEFINE_RWLOCK(capiminors_lock);
 154 static struct capiminor **capiminors;
 155
 156 static struct tty_driver *capinc_tty_driver;
 157
 158 /* -------- datahandles --------------------------------------------- */
 159
 160 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 161 {
 162         struct datahandle_queue *n;
 163         unsigned long flags;
 164
 165         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 166         if (unlikely(!n)) {
 167                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 168                 return -1;
 169         }
 170         n->datahandle = datahandle;
 171         INIT_LIST_HEAD(&n->list);
 172         spin_lock_irqsave(&mp->ackqlock, flags);
 173         list_add_tail(&n->list, &mp->ackqueue);
 174         mp->nack++;
 175         spin_unlock_irqrestore(&mp->ackqlock, flags);
 176         return 0;
 177 }
 178
 179 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 180 {
 181         struct datahandle_queue *p, *tmp;
 182         unsigned long flags;
 183
 184         spin_lock_irqsave(&mp->ackqlock, flags);
 185         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 186                 if (p->datahandle == datahandle) {
 187                         list_del(&p->list);
 188                         kfree(p);
 189                         mp->nack--;
 190                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 191                         return 0;
 192                 }
 193         }
 194         spin_unlock_irqrestore(&mp->ackqlock, flags);
 195         return -1;
 196 }
 197
 198 static void capiminor_del_all_ack(struct capiminor *mp)
 199 {
 200         struct datahandle_queue *p, *tmp;
 201         unsigned long flags;
 202
 203         spin_lock_irqsave(&mp->ackqlock, flags);
 204         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 205                 list_del(&p->list);
 206                 kfree(p);
 207                 mp->nack--;
 208         }
 209         spin_unlock_irqrestore(&mp->ackqlock, flags);
 210 }
 211
 212
 213 /* -------- struct capiminor ---------------------------------------- */
 214
 215 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 216 {
 217         struct capiminor *mp;
 218         struct device *dev;
 219         unsigned int minor;
 220         unsigned long flags;
 221
 222         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 223         if (!mp) {
 224                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 225                 return NULL;
 226         }
 227
 228         mp->ap = ap;
 229         mp->ncci = ncci;
 230         mp->msgid = 0;
 231         atomic_set(&mp->ttyopencount,0);
 232         INIT_LIST_HEAD(&mp->ackqueue);
 233         spin_lock_init(&mp->ackqlock);
 234
 235         skb_queue_head_init(&mp->inqueue);
 236         skb_queue_head_init(&mp->outqueue);
 237
 238         /* Allocate the least unused minor number. */
 239         write_lock_irqsave(&capiminors_lock, flags);
 240         for (minor = 0; minor < capi_ttyminors; minor++)
 241                 if (!capiminors[minor]) {
 242                         capiminors[minor] = mp;
 243                         break;
 244                 }
 245         write_unlock_irqrestore(&capiminors_lock, flags);
 246
 247         if (minor == capi_ttyminors) {
 248                 printk(KERN_NOTICE "capi: out of minors\n");
 249                 goto err_out1;
 250         }
 251
 252         mp->minor = minor;
 253
 254         dev = tty_register_device(capinc_tty_driver, minor, NULL);
 255         if (IS_ERR(dev))
 256                 goto err_out2;
 257
 258         return mp;
 259
 260 err_out2:
 261         write_lock_irqsave(&capiminors_lock, flags);
 262         capiminors[minor] = NULL;
 263         write_unlock_irqrestore(&capiminors_lock, flags);
 264
 265 err_out1:
 266         kfree(mp);
 267         return NULL;
 268 }
 269
 270 static void capiminor_free(struct capiminor *mp)
 271 {
 272         unsigned long flags;
 273
 274         tty_unregister_device(capinc_tty_driver, mp->minor);
 275
 276         write_lock_irqsave(&capiminors_lock, flags);
 277         capiminors[mp->minor] = NULL;
 278         write_unlock_irqrestore(&capiminors_lock, flags);
 279
 280         kfree_skb(mp->ttyskb);
 281         mp->ttyskb = NULL;
 282         skb_queue_purge(&mp->inqueue);
 283         skb_queue_purge(&mp->outqueue);
 284         capiminor_del_all_ack(mp);
 285         kfree(mp);
 286 }
 287
 288 static struct capiminor *capiminor_get(unsigned int minor)
 289 {
 290         struct capiminor *mp;
 291
 292         read_lock(&capiminors_lock);
 293         mp = capiminors[minor];
 294         read_unlock(&capiminors_lock);
 295
 296         return mp;
 297 }
 298
 299 /* -------- struct capincci ----------------------------------------- */
 300
 301 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 302 {
 303         struct capiminor *mp;
 304
 305         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 306                 return;
 307
 308         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 309         if (mp) {
 310                 mp->nccip = np;
 311 #ifdef _DEBUG_REFCOUNT
 312                 printk(KERN_DEBUG "set mp->nccip\n");
 313 #endif
 314                 mp->capifs_dentry =
 315                         capifs_new_ncci(mp->minor,
 316                                         MKDEV(capi_ttymajor, mp->minor));
 317         }
 318 }
 319
 320 static void capincci_free_minor(struct capincci *np)
 321 {
 322         struct capiminor *mp = np->minorp;
 323
 324         if (mp) {
 325                 capifs_free_ncci(mp->capifs_dentry);
 326                 if (mp->tty) {
 327                         mp->nccip = NULL;
 328 #ifdef _DEBUG_REFCOUNT
 329                         printk(KERN_DEBUG "reset mp->nccip\n");
 330 #endif
 331                         tty_hangup(mp->tty);
 332                 } else {
 333                         capiminor_free(mp);
 334                 }
 335         }
 336 }
 337
 338 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 339 {
 340         struct capiminor *mp = np->minorp;
 341
 342         return mp ? atomic_read(&mp->ttyopencount) : 0;
 343 }
 344
 345 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 346
 347 static inline void
 348 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 349 static inline void capincci_free_minor(struct capincci *np) { }
 350
 351 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 352 {
 353         return 0;
 354 }
 355
 356 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 357
 358 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 359 {
 360         struct capincci *np;
 361
 362         np = kzalloc(sizeof(*np), GFP_KERNEL);
 363         if (!np)
 364                 return NULL;
 365         np->ncci = ncci;
 366         np->cdev = cdev;
 367
 368         capincci_alloc_minor(cdev, np);
 369
 370         list_add_tail(&np->list, &cdev->nccis);
 371
 372         return np;
 373 }
 374
 375 static void capincci_free(struct capidev *cdev, u32 ncci)
 376 {
 377         struct capincci *np, *tmp;
 378
 379         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 380                 if (ncci == 0xffffffff || np->ncci == ncci) {
 381                         capincci_free_minor(np);
 382                         list_del(&np->list);
 383                         kfree(np);
 384                 }
 385 }
 386
 387 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 388 {
 389         struct capincci *np;
 390
 391         list_for_each_entry(np, &cdev->nccis, list)
 392                 if (np->ncci == ncci)
 393                         return np;
 394         return NULL;
 395 }
 396
 397 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 398 /* -------- handle data queue --------------------------------------- */
 399
 400 static struct sk_buff *
 401 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 402 {
 403         struct sk_buff *nskb;
 404         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 405         if (nskb) {
 406                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 407                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 408                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 409                 capimsg_setu16(s, 2, mp->ap->applid);
 410                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 411                 capimsg_setu8 (s, 5, CAPI_RESP);
 412                 capimsg_setu16(s, 6, mp->msgid++);
 413                 capimsg_setu32(s, 8, mp->ncci);
 414                 capimsg_setu16(s, 12, datahandle);
 415         }
 416         return nskb;
 417 }
 418
 419 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 420 {
 421         struct sk_buff *nskb;
 422         int datalen;
 423         u16 errcode, datahandle;
 424         struct tty_ldisc *ld;
 425
 426         datalen = skb->len - CAPIMSG_LEN(skb->data);
 427         if (mp->tty == NULL)
 428         {
 429 #ifdef _DEBUG_DATAFLOW
 430                 printk(KERN_DEBUG "capi: currently no receiver\n");
 431 #endif
 432                 return -1;
 433         }
 434
 435         ld = tty_ldisc_ref(mp->tty);
 436         if (ld == NULL)
 437                 return -1;
 438         if (ld->ops->receive_buf == NULL) {
 439 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 440                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 441 #endif
 442                 goto bad;
 443         }
 444         if (mp->ttyinstop) {
 445 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 446                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 447 #endif
 448                 goto bad;
 449         }
 450         if (mp->tty->receive_room < datalen) {
 451 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 452                 printk(KERN_DEBUG "capi: no room in tty\n");
 453 #endif
 454                 goto bad;
 455         }
 456         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 457                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 458                 goto bad;
 459         }
 460         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 461         errcode = capi20_put_message(mp->ap, nskb);
 462         if (errcode != CAPI_NOERROR) {
 463                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 464                                 errcode);
 465                 kfree_skb(nskb);
 466                 goto bad;
 467         }
 468         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 469 #ifdef _DEBUG_DATAFLOW
 470         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 471                                 datahandle, skb->len);
 472 #endif
 473         ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
 474         kfree_skb(skb);
 475         tty_ldisc_deref(ld);
 476         return 0;
 477 bad:
 478         tty_ldisc_deref(ld);
 479         return -1;
 480 }
 481
 482 static void handle_minor_recv(struct capiminor *mp)
 483 {
 484         struct sk_buff *skb;
 485         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 486                 unsigned int len = skb->len;
 487                 mp->inbytes -= len;
 488                 if (handle_recv_skb(mp, skb) < 0) {
 489                         skb_queue_head(&mp->inqueue, skb);
 490                         mp->inbytes += len;
 491                         return;
 492                 }
 493         }
 494 }
 495
 496 static int handle_minor_send(struct capiminor *mp)
 497 {
 498         struct sk_buff *skb;
 499         u16 len;
 500         int count = 0;
 501         u16 errcode;
 502         u16 datahandle;
 503
 504         if (mp->tty && mp->ttyoutstop) {
 505 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 506                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 507 #endif
 508                 return 0;
 509         }
 510
 511         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 512                 datahandle = mp->datahandle;
 513                 len = (u16)skb->len;
 514                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 515                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 516                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 517                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 518                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 519                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 520                 capimsg_setu16(skb->data, 6, mp->msgid++);
 521                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 522                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 523                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 524                 capimsg_setu16(skb->data, 18, datahandle);
 525                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 526
 527                 if (capiminor_add_ack(mp, datahandle) < 0) {
 528                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 529                         skb_queue_head(&mp->outqueue, skb);
 530                         return count;
 531                 }
 532                 errcode = capi20_put_message(mp->ap, skb);
 533                 if (errcode == CAPI_NOERROR) {
 534                         mp->datahandle++;
 535                         count++;
 536                         mp->outbytes -= len;
 537 #ifdef _DEBUG_DATAFLOW
 538                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 539                                                         datahandle, len);
 540 #endif
 541                         continue;
 542                 }
 543                 capiminor_del_ack(mp, datahandle);
 544
 545                 if (errcode == CAPI_SENDQUEUEFULL) {
 546                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 547                         skb_queue_head(&mp->outqueue, skb);
 548                         break;
 549                 }
 550
 551                 /* ups, drop packet */
 552                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 553                 mp->outbytes -= len;
 554                 kfree_skb(skb);
 555         }
 556         return count;
 557 }
 558
 559 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 560 /* -------- function called by lower level -------------------------- */
 561
 562 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 563 {
 564         struct capidev *cdev = ap->private;
 565 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 566         struct capiminor *mp;
 567         u16 datahandle;
 568 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 569         struct capincci *np;
 570         unsigned long flags;
 571
 572         mutex_lock(&cdev->lock);
 573
 574         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 575                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 576                 if ((info & 0xff00) == 0)
 577                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 578         }
 579         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 580                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 581
 582         spin_lock_irqsave(&workaround_lock, flags);
 583         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 584                 skb_queue_tail(&cdev->recvqueue, skb);
 585                 wake_up_interruptible(&cdev->recvwait);
 586                 goto unlock_out;
 587         }
 588
 589         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 590         if (!np) {
 591                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 592                 skb_queue_tail(&cdev->recvqueue, skb);
 593                 wake_up_interruptible(&cdev->recvwait);
 594                 goto unlock_out;
 595         }
 596
 597 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 598         skb_queue_tail(&cdev->recvqueue, skb);
 599         wake_up_interruptible(&cdev->recvwait);
 600
 601 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 602
 603         mp = np->minorp;
 604         if (!mp) {
 605                 skb_queue_tail(&cdev->recvqueue, skb);
 606                 wake_up_interruptible(&cdev->recvwait);
 607                 goto unlock_out;
 608         }
 609         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 610                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 611 #ifdef _DEBUG_DATAFLOW
 612                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 613                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 614 #endif
 615                 skb_queue_tail(&mp->inqueue, skb);
 616                 mp->inbytes += skb->len;
 617                 handle_minor_recv(mp);
 618
 619         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 620
 621                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 622 #ifdef _DEBUG_DATAFLOW
 623                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 624                                 datahandle,
 625                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 626 #endif
 627                 kfree_skb(skb);
 628                 (void)capiminor_del_ack(mp, datahandle);
 629                 if (mp->tty)
 630                         tty_wakeup(mp->tty);
 631                 (void)handle_minor_send(mp);
 632
 633         } else {
 634                 /* ups, let capi application handle it :-) */
 635                 skb_queue_tail(&cdev->recvqueue, skb);
 636                 wake_up_interruptible(&cdev->recvwait);
 637         }
 638 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 639
 640 unlock_out:
 641         spin_unlock_irqrestore(&workaround_lock, flags);
 642         mutex_unlock(&cdev->lock);
 643 }
 644
 645 /* -------- file_operations for capidev ----------------------------- */
 646
 647 static ssize_t
 648 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 649 {
 650         struct capidev *cdev = (struct capidev *)file->private_data;
 651         struct sk_buff *skb;
 652         size_t copied;
 653         int err;
 654
 655         if (!cdev->ap.applid)
 656                 return -ENODEV;
 657
 658         skb = skb_dequeue(&cdev->recvqueue);
 659         if (!skb) {
 660                 if (file->f_flags & O_NONBLOCK)
 661                         return -EAGAIN;
 662                 err = wait_event_interruptible(cdev->recvwait,
 663                                 (skb = skb_dequeue(&cdev->recvqueue)));
 664                 if (err)
 665                         return err;
 666         }
 667         if (skb->len > count) {
 668                 skb_queue_head(&cdev->recvqueue, skb);
 669                 return -EMSGSIZE;
 670         }
 671         if (copy_to_user(buf, skb->data, skb->len)) {
 672                 skb_queue_head(&cdev->recvqueue, skb);
 673                 return -EFAULT;
 674         }
 675         copied = skb->len;
 676
 677         kfree_skb(skb);
 678
 679         return copied;
 680 }
 681
 682 static ssize_t
 683 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 684 {
 685         struct capidev *cdev = (struct capidev *)file->private_data;
 686         struct sk_buff *skb;
 687         u16 mlen;
 688
 689         if (!cdev->ap.applid)
 690                 return -ENODEV;
 691
 692         skb = alloc_skb(count, GFP_USER);
 693         if (!skb)
 694                 return -ENOMEM;
 695
 696         if (copy_from_user(skb_put(skb, count), buf, count)) {
 697                 kfree_skb(skb);
 698                 return -EFAULT;
 699         }
 700         mlen = CAPIMSG_LEN(skb->data);
 701         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 702                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 703                         kfree_skb(skb);
 704                         return -EINVAL;
 705                 }
 706         } else {
 707                 if (mlen != count) {
 708                         kfree_skb(skb);
 709                         return -EINVAL;
 710                 }
 711         }
 712         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 713
 714         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 715                 mutex_lock(&cdev->lock);
 716                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 717                 mutex_unlock(&cdev->lock);
 718         }
 719
 720         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 721
 722         if (cdev->errcode) {
 723                 kfree_skb(skb);
 724                 return -EIO;
 725         }
 726         return count;
 727 }
 728
 729 static unsigned int
 730 capi_poll(struct file *file, poll_table * wait)
 731 {
 732         struct capidev *cdev = (struct capidev *)file->private_data;
 733         unsigned int mask = 0;
 734
 735         if (!cdev->ap.applid)
 736                 return POLLERR;
 737
 738         poll_wait(file, &(cdev->recvwait), wait);
 739         mask = POLLOUT | POLLWRNORM;
 740         if (!skb_queue_empty(&cdev->recvqueue))
 741                 mask |= POLLIN | POLLRDNORM;
 742         return mask;
 743 }
 744
 745 static int
 746 capi_ioctl(struct inode *inode, struct file *file,
 747            unsigned int cmd, unsigned long arg)
 748 {
 749         struct capidev *cdev = file->private_data;
 750         capi_ioctl_struct data;
 751         int retval = -EINVAL;
 752         void __user *argp = (void __user *)arg;
 753
 754         switch (cmd) {
 755         case CAPI_REGISTER:
 756                 mutex_lock(&cdev->lock);
 757
 758                 if (cdev->ap.applid) {
 759                         retval = -EEXIST;
 760                         goto register_out;
 761                 }
 762                 if (copy_from_user(&cdev->ap.rparam, argp,
 763                                    sizeof(struct capi_register_params))) {
 764                         retval = -EFAULT;
 765                         goto register_out;
 766                 }
 767                 cdev->ap.private = cdev;
 768                 cdev->ap.recv_message = capi_recv_message;
 769                 cdev->errcode = capi20_register(&cdev->ap);
 770                 retval = (int)cdev->ap.applid;
 771                 if (cdev->errcode) {
 772                         cdev->ap.applid = 0;
 773                         retval = -EIO;
 774                 }
 775
 776 register_out:
 777                 mutex_unlock(&cdev->lock);
 778                 return retval;
 779
 780         case CAPI_GET_VERSION:
 781                 {
 782                         if (copy_from_user(&data.contr, argp,
 783                                                 sizeof(data.contr)))
 784                                 return -EFAULT;
 785                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 786                         if (cdev->errcode)
 787                                 return -EIO;
 788                         if (copy_to_user(argp, &data.version,
 789                                          sizeof(data.version)))
 790                                 return -EFAULT;
 791                 }
 792                 return 0;
 793
 794         case CAPI_GET_SERIAL:
 795                 {
 796                         if (copy_from_user(&data.contr, argp,
 797                                            sizeof(data.contr)))
 798                                 return -EFAULT;
 799                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 800                         if (cdev->errcode)
 801                                 return -EIO;
 802                         if (copy_to_user(argp, data.serial,
 803                                          sizeof(data.serial)))
 804                                 return -EFAULT;
 805                 }
 806                 return 0;
 807         case CAPI_GET_PROFILE:
 808                 {
 809                         if (copy_from_user(&data.contr, argp,
 810                                            sizeof(data.contr)))
 811                                 return -EFAULT;
 812
 813                         if (data.contr == 0) {
 814                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 815                                 if (cdev->errcode)
 816                                         return -EIO;
 817
 818                                 retval = copy_to_user(argp,
 819                                       &data.profile.ncontroller,
 820                                        sizeof(data.profile.ncontroller));
 821
 822                         } else {
 823                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 824                                 if (cdev->errcode)
 825                                         return -EIO;
 826
 827                                 retval = copy_to_user(argp, &data.profile,
 828                                                    sizeof(data.profile));
 829                         }
 830                         if (retval)
 831                                 return -EFAULT;
 832                 }
 833                 return 0;
 834
 835         case CAPI_GET_MANUFACTURER:
 836                 {
 837                         if (copy_from_user(&data.contr, argp,
 838                                            sizeof(data.contr)))
 839                                 return -EFAULT;
 840                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 841                         if (cdev->errcode)
 842                                 return -EIO;
 843
 844                         if (copy_to_user(argp, data.manufacturer,
 845                                          sizeof(data.manufacturer)))
 846                                 return -EFAULT;
 847
 848                 }
 849                 return 0;
 850         case CAPI_GET_ERRCODE:
 851                 data.errcode = cdev->errcode;
 852                 cdev->errcode = CAPI_NOERROR;
 853                 if (arg) {
 854                         if (copy_to_user(argp, &data.errcode,
 855                                          sizeof(data.errcode)))
 856                                 return -EFAULT;
 857                 }
 858                 return data.errcode;
 859
 860         case CAPI_INSTALLED:
 861                 if (capi20_isinstalled() == CAPI_NOERROR)
 862                         return 0;
 863                 return -ENXIO;
 864
 865         case CAPI_MANUFACTURER_CMD:
 866                 {
 867                         struct capi_manufacturer_cmd mcmd;
 868                         if (!capable(CAP_SYS_ADMIN))
 869                                 return -EPERM;
 870                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 871                                 return -EFAULT;
 872                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 873                 }
 874                 return 0;
 875
 876         case CAPI_SET_FLAGS:
 877         case CAPI_CLR_FLAGS: {
 878                 unsigned userflags;
 879
 880                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 881                         return -EFAULT;
 882
 883                 mutex_lock(&cdev->lock);
 884                 if (cmd == CAPI_SET_FLAGS)
 885                         cdev->userflags |= userflags;
 886                 else
 887                         cdev->userflags &= ~userflags;
 888                 mutex_unlock(&cdev->lock);
 889                 return 0;
 890         }
 891         case CAPI_GET_FLAGS:
 892                 if (copy_to_user(argp, &cdev->userflags,
 893                                  sizeof(cdev->userflags)))
 894                         return -EFAULT;
 895                 return 0;
 896
 897         case CAPI_NCCI_OPENCOUNT: {
 898                 struct capincci *nccip;
 899                 unsigned ncci;
 900                 int count = 0;
 901
 902                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 903                         return -EFAULT;
 904
 905                 mutex_lock(&cdev->lock);
 906                 nccip = capincci_find(cdev, (u32)ncci);
 907                 if (nccip)
 908                         count = capincci_minor_opencount(nccip);
 909                 mutex_unlock(&cdev->lock);
 910                 return count;
 911         }
 912
 913 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 914         case CAPI_NCCI_GETUNIT: {
 915                 struct capincci *nccip;
 916                 struct capiminor *mp;
 917                 unsigned ncci;
 918                 int unit = -ESRCH;
 919
 920                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 921                         return -EFAULT;
 922
 923                 mutex_lock(&cdev->lock);
 924                 nccip = capincci_find(cdev, (u32)ncci);
 925                 if (nccip) {
 926                         mp = nccip->minorp;
 927                         if (mp)
 928                                 unit = mp->minor;
 929                 }
 930                 mutex_unlock(&cdev->lock);
 931                 return unit;
 932         }
 933 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 934
 935         default:
 936                 return -EINVAL;
 937         }
 938 }
 939
 940 static int capi_open(struct inode *inode, struct file *file)
 941 {
 942         struct capidev *cdev;
 943
 944         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 945         if (!cdev)
 946                 return -ENOMEM;
 947
 948         mutex_init(&cdev->lock);
 949         skb_queue_head_init(&cdev->recvqueue);
 950         init_waitqueue_head(&cdev->recvwait);
 951         INIT_LIST_HEAD(&cdev->nccis);
 952         file->private_data = cdev;
 953
 954         mutex_lock(&capidev_list_lock);
 955         list_add_tail(&cdev->list, &capidev_list);
 956         mutex_unlock(&capidev_list_lock);
 957
 958         return nonseekable_open(inode, file);
 959 }
 960
 961 static int capi_release(struct inode *inode, struct file *file)
 962 {
 963         struct capidev *cdev = file->private_data;
 964
 965         mutex_lock(&capidev_list_lock);
 966         list_del(&cdev->list);
 967         mutex_unlock(&capidev_list_lock);
 968
 969         if (cdev->ap.applid)
 970                 capi20_release(&cdev->ap);
 971         skb_queue_purge(&cdev->recvqueue);
 972         capincci_free(cdev, 0xffffffff);
 973
 974         kfree(cdev);
 975         return 0;
 976 }
 977
 978 static const struct file_operations capi_fops =
 979 {
 980         .owner          = THIS_MODULE,
 981         .llseek         = no_llseek,
 982         .read           = capi_read,
 983         .write          = capi_write,
 984         .poll           = capi_poll,
 985         .ioctl          = capi_ioctl,
 986         .open           = capi_open,
 987         .release        = capi_release,
 988 };
 989
 990 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 991 /* -------- tty_operations for capincci ----------------------------- */
 992
 993 static int capinc_tty_open(struct tty_struct * tty, struct file * file)
 994 {
 995         struct capiminor *mp;
 996         unsigned long flags;
 997
 998         mp = capiminor_get(iminor(file->f_path.dentry->d_inode));
 999         if (mp->nccip == NULL)
1000                 return -ENXIO;
1001
1002         tty->driver_data = (void *)mp;
1003
1004         spin_lock_irqsave(&workaround_lock, flags);
1005         if (atomic_read(&mp->ttyopencount) == 0)
1006                 mp->tty = tty;
1007         atomic_inc(&mp->ttyopencount);
1008 #ifdef _DEBUG_REFCOUNT
1009         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1010 #endif
1011         handle_minor_recv(mp);
1012         spin_unlock_irqrestore(&workaround_lock, flags);
1013         return 0;
1014 }
1015
1016 static void capinc_tty_close(struct tty_struct * tty, struct file * file)
1017 {
1018         struct capiminor *mp;
1019
1020         mp = (struct capiminor *)tty->driver_data;
1021         if (mp) {
1022                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1023 #ifdef _DEBUG_REFCOUNT
1024                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1025 #endif
1026                         tty->driver_data = NULL;
1027                         mp->tty = NULL;
1028                 }
1029 #ifdef _DEBUG_REFCOUNT
1030                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1031 #endif
1032                 if (mp->nccip == NULL)
1033                         capiminor_free(mp);
1034         }
1035
1036 #ifdef _DEBUG_REFCOUNT
1037         printk(KERN_DEBUG "capinc_tty_close\n");
1038 #endif
1039 }
1040
1041 static int capinc_tty_write(struct tty_struct * tty,
1042                             const unsigned char *buf, int count)
1043 {
1044         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1045         struct sk_buff *skb;
1046         unsigned long flags;
1047
1048 #ifdef _DEBUG_TTYFUNCS
1049         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1050 #endif
1051
1052         if (!mp || !mp->nccip) {
1053 #ifdef _DEBUG_TTYFUNCS
1054                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1055 #endif
1056                 return 0;
1057         }
1058
1059         spin_lock_irqsave(&workaround_lock, flags);
1060         skb = mp->ttyskb;
1061         if (skb) {
1062                 mp->ttyskb = NULL;
1063                 skb_queue_tail(&mp->outqueue, skb);
1064                 mp->outbytes += skb->len;
1065         }
1066
1067         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1068         if (!skb) {
1069                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1070                 spin_unlock_irqrestore(&workaround_lock, flags);
1071                 return -ENOMEM;
1072         }
1073
1074         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1075         memcpy(skb_put(skb, count), buf, count);
1076
1077         skb_queue_tail(&mp->outqueue, skb);
1078         mp->outbytes += skb->len;
1079         (void)handle_minor_send(mp);
1080         (void)handle_minor_recv(mp);
1081         spin_unlock_irqrestore(&workaround_lock, flags);
1082         return count;
1083 }
1084
1085 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1086 {
1087         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1088         struct sk_buff *skb;
1089         unsigned long flags;
1090         int ret = 1;
1091
1092 #ifdef _DEBUG_TTYFUNCS
1093         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1094 #endif
1095
1096         if (!mp || !mp->nccip) {
1097 #ifdef _DEBUG_TTYFUNCS
1098                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1099 #endif
1100                 return 0;
1101         }
1102
1103         spin_lock_irqsave(&workaround_lock, flags);
1104         skb = mp->ttyskb;
1105         if (skb) {
1106                 if (skb_tailroom(skb) > 0) {
1107                         *(skb_put(skb, 1)) = ch;
1108                         spin_unlock_irqrestore(&workaround_lock, flags);
1109                         return 1;
1110                 }
1111                 mp->ttyskb = NULL;
1112                 skb_queue_tail(&mp->outqueue, skb);
1113                 mp->outbytes += skb->len;
1114                 (void)handle_minor_send(mp);
1115         }
1116         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1117         if (skb) {
1118                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1119                 *(skb_put(skb, 1)) = ch;
1120                 mp->ttyskb = skb;
1121         } else {
1122                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1123                 ret = 0;
1124         }
1125         spin_unlock_irqrestore(&workaround_lock, flags);
1126         return ret;
1127 }
1128
1129 static void capinc_tty_flush_chars(struct tty_struct *tty)
1130 {
1131         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1132         struct sk_buff *skb;
1133         unsigned long flags;
1134
1135 #ifdef _DEBUG_TTYFUNCS
1136         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1137 #endif
1138
1139         if (!mp || !mp->nccip) {
1140 #ifdef _DEBUG_TTYFUNCS
1141                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1142 #endif
1143                 return;
1144         }
1145
1146         spin_lock_irqsave(&workaround_lock, flags);
1147         skb = mp->ttyskb;
1148         if (skb) {
1149                 mp->ttyskb = NULL;
1150                 skb_queue_tail(&mp->outqueue, skb);
1151                 mp->outbytes += skb->len;
1152                 (void)handle_minor_send(mp);
1153         }
1154         (void)handle_minor_recv(mp);
1155         spin_unlock_irqrestore(&workaround_lock, flags);
1156 }
1157
1158 static int capinc_tty_write_room(struct tty_struct *tty)
1159 {
1160         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1161         int room;
1162         if (!mp || !mp->nccip) {
1163 #ifdef _DEBUG_TTYFUNCS
1164                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1165 #endif
1166                 return 0;
1167         }
1168         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1169         room *= CAPI_MAX_BLKSIZE;
1170 #ifdef _DEBUG_TTYFUNCS
1171         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1172 #endif
1173         return room;
1174 }
1175
1176 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1177 {
1178         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1179         if (!mp || !mp->nccip) {
1180 #ifdef _DEBUG_TTYFUNCS
1181                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1182 #endif
1183                 return 0;
1184         }
1185 #ifdef _DEBUG_TTYFUNCS
1186         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1187                         mp->outbytes, mp->nack,
1188                         skb_queue_len(&mp->outqueue),
1189                         skb_queue_len(&mp->inqueue));
1190 #endif
1191         return mp->outbytes;
1192 }
1193
1194 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1195                     unsigned int cmd, unsigned long arg)
1196 {
1197         int error = 0;
1198         switch (cmd) {
1199         default:
1200                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1201                 break;
1202         }
1203         return error;
1204 }
1205
1206 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1207 {
1208 #ifdef _DEBUG_TTYFUNCS
1209         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1210 #endif
1211 }
1212
1213 static void capinc_tty_throttle(struct tty_struct * tty)
1214 {
1215         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1216 #ifdef _DEBUG_TTYFUNCS
1217         printk(KERN_DEBUG "capinc_tty_throttle\n");
1218 #endif
1219         if (mp)
1220                 mp->ttyinstop = 1;
1221 }
1222
1223 static void capinc_tty_unthrottle(struct tty_struct * tty)
1224 {
1225         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1226         unsigned long flags;
1227 #ifdef _DEBUG_TTYFUNCS
1228         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1229 #endif
1230         if (mp) {
1231                 spin_lock_irqsave(&workaround_lock, flags);
1232                 mp->ttyinstop = 0;
1233                 handle_minor_recv(mp);
1234                 spin_unlock_irqrestore(&workaround_lock, flags);
1235         }
1236 }
1237
1238 static void capinc_tty_stop(struct tty_struct *tty)
1239 {
1240         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1241 #ifdef _DEBUG_TTYFUNCS
1242         printk(KERN_DEBUG "capinc_tty_stop\n");
1243 #endif
1244         if (mp) {
1245                 mp->ttyoutstop = 1;
1246         }
1247 }
1248
1249 static void capinc_tty_start(struct tty_struct *tty)
1250 {
1251         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1252         unsigned long flags;
1253 #ifdef _DEBUG_TTYFUNCS
1254         printk(KERN_DEBUG "capinc_tty_start\n");
1255 #endif
1256         if (mp) {
1257                 spin_lock_irqsave(&workaround_lock, flags);
1258                 mp->ttyoutstop = 0;
1259                 (void)handle_minor_send(mp);
1260                 spin_unlock_irqrestore(&workaround_lock, flags);
1261         }
1262 }
1263
1264 static void capinc_tty_hangup(struct tty_struct *tty)
1265 {
1266 #ifdef _DEBUG_TTYFUNCS
1267         printk(KERN_DEBUG "capinc_tty_hangup\n");
1268 #endif
1269 }
1270
1271 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1272 {
1273 #ifdef _DEBUG_TTYFUNCS
1274         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1275 #endif
1276         return 0;
1277 }
1278
1279 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1280 {
1281 #ifdef _DEBUG_TTYFUNCS
1282         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1283 #endif
1284 }
1285
1286 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1287 {
1288 #ifdef _DEBUG_TTYFUNCS
1289         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1290 #endif
1291 }
1292
1293 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1294 {
1295 #ifdef _DEBUG_TTYFUNCS
1296         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1297 #endif
1298 }
1299
1300 static const struct tty_operations capinc_ops = {
1301         .open = capinc_tty_open,
1302         .close = capinc_tty_close,
1303         .write = capinc_tty_write,
1304         .put_char = capinc_tty_put_char,
1305         .flush_chars = capinc_tty_flush_chars,
1306         .write_room = capinc_tty_write_room,
1307         .chars_in_buffer = capinc_tty_chars_in_buffer,
1308         .ioctl = capinc_tty_ioctl,
1309         .set_termios = capinc_tty_set_termios,
1310         .throttle = capinc_tty_throttle,
1311         .unthrottle = capinc_tty_unthrottle,
1312         .stop = capinc_tty_stop,
1313         .start = capinc_tty_start,
1314         .hangup = capinc_tty_hangup,
1315         .break_ctl = capinc_tty_break_ctl,
1316         .flush_buffer = capinc_tty_flush_buffer,
1317         .set_ldisc = capinc_tty_set_ldisc,
1318         .send_xchar = capinc_tty_send_xchar,
1319 };
1320
1321 static int __init capinc_tty_init(void)
1322 {
1323         struct tty_driver *drv;
1324         int err;
1325
1326         if (capi_ttyminors > CAPINC_MAX_PORTS)
1327                 capi_ttyminors = CAPINC_MAX_PORTS;
1328         if (capi_ttyminors <= 0)
1329                 capi_ttyminors = CAPINC_NR_PORTS;
1330
1331         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1332                              GFP_KERNEL);
1333         if (!capiminors)
1334                 return -ENOMEM;
1335
1336         drv = alloc_tty_driver(capi_ttyminors);
1337         if (!drv) {
1338                 kfree(capiminors);
1339                 return -ENOMEM;
1340         }
1341         drv->owner = THIS_MODULE;
1342         drv->driver_name = "capi_nc";
1343         drv->name = "capi";
1344         drv->major = capi_ttymajor;
1345         drv->minor_start = 0;
1346         drv->type = TTY_DRIVER_TYPE_SERIAL;
1347         drv->subtype = SERIAL_TYPE_NORMAL;
1348         drv->init_termios = tty_std_termios;
1349         drv->init_termios.c_iflag = ICRNL;
1350         drv->init_termios.c_oflag = OPOST | ONLCR;
1351         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1352         drv->init_termios.c_lflag = 0;
1353         drv->flags =
1354                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1355                 TTY_DRIVER_DYNAMIC_DEV;
1356         tty_set_operations(drv, &capinc_ops);
1357
1358         err = tty_register_driver(drv);
1359         if (err) {
1360                 put_tty_driver(drv);
1361                 kfree(capiminors);
1362                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1363                 return err;
1364         }
1365         capinc_tty_driver = drv;
1366         return 0;
1367 }
1368
1369 static void __exit capinc_tty_exit(void)
1370 {
1371         tty_unregister_driver(capinc_tty_driver);
1372         put_tty_driver(capinc_tty_driver);
1373         kfree(capiminors);
1374 }
1375
1376 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1377
1378 static inline int capinc_tty_init(void)
1379 {
1380         return 0;
1381 }
1382
1383 static inline void capinc_tty_exit(void) { }
1384
1385 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1386
1387 /* -------- /proc functions ----------------------------------------- */
1388
1389 /*
1390  * /proc/capi/capi20:
1391  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1392  */
1393 static int capi20_proc_show(struct seq_file *m, void *v)
1394 {
1395         struct capidev *cdev;
1396         struct list_head *l;
1397
1398         mutex_lock(&capidev_list_lock);
1399         list_for_each(l, &capidev_list) {
1400                 cdev = list_entry(l, struct capidev, list);
1401                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1402                         cdev->ap.applid,
1403                         cdev->ap.nrecvctlpkt,
1404                         cdev->ap.nrecvdatapkt,
1405                         cdev->ap.nsentctlpkt,
1406                         cdev->ap.nsentdatapkt);
1407         }
1408         mutex_unlock(&capidev_list_lock);
1409         return 0;
1410 }
1411
1412 static int capi20_proc_open(struct inode *inode, struct file *file)
1413 {
1414         return single_open(file, capi20_proc_show, NULL);
1415 }
1416
1417 static const struct file_operations capi20_proc_fops = {
1418         .owner          = THIS_MODULE,
1419         .open           = capi20_proc_open,
1420         .read           = seq_read,
1421         .llseek         = seq_lseek,
1422         .release        = single_release,
1423 };
1424
1425 /*
1426  * /proc/capi/capi20ncci:
1427  *  applid ncci
1428  */
1429 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1430 {
1431         struct capidev *cdev;
1432         struct capincci *np;
1433
1434         mutex_lock(&capidev_list_lock);
1435         list_for_each_entry(cdev, &capidev_list, list) {
1436                 mutex_lock(&cdev->lock);
1437                 list_for_each_entry(np, &cdev->nccis, list)
1438                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1439                 mutex_unlock(&cdev->lock);
1440         }
1441         mutex_unlock(&capidev_list_lock);
1442         return 0;
1443 }
1444
1445 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1446 {
1447         return single_open(file, capi20ncci_proc_show, NULL);
1448 }
1449
1450 static const struct file_operations capi20ncci_proc_fops = {
1451         .owner          = THIS_MODULE,
1452         .open           = capi20ncci_proc_open,
1453         .read           = seq_read,
1454         .llseek         = seq_lseek,
1455         .release        = single_release,
1456 };
1457
1458 static void __init proc_init(void)
1459 {
1460         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1461         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1462 }
1463
1464 static void __exit proc_exit(void)
1465 {
1466         remove_proc_entry("capi/capi20", NULL);
1467         remove_proc_entry("capi/capi20ncci", NULL);
1468 }
1469
1470 /* -------- init function and module interface ---------------------- */
1471
1472
1473 static int __init capi_init(void)
1474 {
1475         const char *compileinfo;
1476         int major_ret;
1477
1478         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1479         if (major_ret < 0) {
1480                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1481                 return major_ret;
1482         }
1483         capi_class = class_create(THIS_MODULE, "capi");
1484         if (IS_ERR(capi_class)) {
1485                 unregister_chrdev(capi_major, "capi20");
1486                 return PTR_ERR(capi_class);
1487         }
1488
1489         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1490
1491         if (capinc_tty_init() < 0) {
1492                 device_destroy(capi_class, MKDEV(capi_major, 0));
1493                 class_destroy(capi_class);
1494                 unregister_chrdev(capi_major, "capi20");
1495                 return -ENOMEM;
1496         }
1497
1498         proc_init();
1499
1500 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1501         compileinfo = " (middleware+capifs)";
1502 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1503         compileinfo = " (no capifs)";
1504 #else
1505         compileinfo = " (no middleware)";
1506 #endif
1507         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1508                capi_major, compileinfo);
1509
1510         return 0;
1511 }
1512
1513 static void __exit capi_exit(void)
1514 {
1515         proc_exit();
1516
1517         device_destroy(capi_class, MKDEV(capi_major, 0));
1518         class_destroy(capi_class);
1519         unregister_chrdev(capi_major, "capi20");
1520
1521         capinc_tty_exit();
1522 }
1523
1524 module_init(capi_init);
1525 module_exit(capi_exit);