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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_TTYFUNCS          /* call to tty_driver */
  49 #undef _DEBUG_DATAFLOW          /* data flow */
  50
  51 /* -------- driver information -------------------------------------- */
  52
  53 static struct class *capi_class;
  54 static int capi_major = 68;             /* allocated */
  55
  56 module_param_named(major, capi_major, uint, 0);
  57
  58 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  59 #define CAPINC_NR_PORTS         32
  60 #define CAPINC_MAX_PORTS        256
  61
  62 static int capi_ttyminors = CAPINC_NR_PORTS;
  63
  64 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  65 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  66
  67 /* -------- defines ------------------------------------------------- */
  68
  69 #define CAPINC_MAX_RECVQUEUE    10
  70 #define CAPINC_MAX_SENDQUEUE    10
  71 #define CAPI_MAX_BLKSIZE        2048
  72
  73 /* -------- data structures ----------------------------------------- */
  74
  75 struct capidev;
  76 struct capincci;
  77 struct capiminor;
  78
  79 struct ackqueue_entry {
  80         struct list_head        list;
  81         u16                     datahandle;
  82 };
  83
  84 struct capiminor {
  85         struct kref kref;
  86
  87         unsigned int      minor;
  88         struct dentry *capifs_dentry;
  89
  90         struct capi20_appl      *ap;
  91         u32                     ncci;
  92         atomic_t                datahandle;
  93         atomic_t                msgid;
  94
  95         struct tty_port port;
  96         int                ttyinstop;
  97         int                ttyoutstop;
  98         struct sk_buff    *ttyskb;
  99
 100         struct sk_buff_head inqueue;
 101         struct sk_buff_head outqueue;
 102         int                 outbytes;
 103
 104         /* transmit path */
 105         struct list_head ackqueue;
 106         int nack;
 107         spinlock_t ackqlock;
 108 };
 109
 110 /* FIXME: The following lock is a sledgehammer-workaround to a
 111  * locking issue with the capiminor (and maybe other) data structure(s).
 112  * Access to this data is done in a racy way and crashes the machine with
 113  * a FritzCard DSL driver; sooner or later. This is a workaround
 114  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 115  * The correct (and scalable) fix for the issue seems to require
 116  * an API change to the drivers... . */
 117 static DEFINE_SPINLOCK(workaround_lock);
 118
 119 struct capincci {
 120         struct list_head list;
 121         u32              ncci;
 122         struct capidev  *cdev;
 123 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 124         struct capiminor *minorp;
 125 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 126 };
 127
 128 struct capidev {
 129         struct list_head list;
 130         struct capi20_appl ap;
 131         u16             errcode;
 132         unsigned        userflags;
 133
 134         struct sk_buff_head recvqueue;
 135         wait_queue_head_t recvwait;
 136
 137         struct list_head nccis;
 138
 139         struct mutex lock;
 140 };
 141
 142 /* -------- global variables ---------------------------------------- */
 143
 144 static DEFINE_MUTEX(capidev_list_lock);
 145 static LIST_HEAD(capidev_list);
 146
 147 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 148
 149 static DEFINE_SPINLOCK(capiminors_lock);
 150 static struct capiminor **capiminors;
 151
 152 static struct tty_driver *capinc_tty_driver;
 153
 154 /* -------- datahandles --------------------------------------------- */
 155
 156 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 157 {
 158         struct ackqueue_entry *n;
 159         unsigned long flags;
 160
 161         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 162         if (unlikely(!n)) {
 163                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 164                 return -1;
 165         }
 166         n->datahandle = datahandle;
 167         INIT_LIST_HEAD(&n->list);
 168         spin_lock_irqsave(&mp->ackqlock, flags);
 169         list_add_tail(&n->list, &mp->ackqueue);
 170         mp->nack++;
 171         spin_unlock_irqrestore(&mp->ackqlock, flags);
 172         return 0;
 173 }
 174
 175 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 176 {
 177         struct ackqueue_entry *p, *tmp;
 178         unsigned long flags;
 179
 180         spin_lock_irqsave(&mp->ackqlock, flags);
 181         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 182                 if (p->datahandle == datahandle) {
 183                         list_del(&p->list);
 184                         kfree(p);
 185                         mp->nack--;
 186                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 187                         return 0;
 188                 }
 189         }
 190         spin_unlock_irqrestore(&mp->ackqlock, flags);
 191         return -1;
 192 }
 193
 194 static void capiminor_del_all_ack(struct capiminor *mp)
 195 {
 196         struct ackqueue_entry *p, *tmp;
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&mp->ackqlock, flags);
 200         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 201                 list_del(&p->list);
 202                 kfree(p);
 203                 mp->nack--;
 204         }
 205         spin_unlock_irqrestore(&mp->ackqlock, flags);
 206 }
 207
 208
 209 /* -------- struct capiminor ---------------------------------------- */
 210
 211 static const struct tty_port_operations capiminor_port_ops; /* we have none */
 212
 213 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 214 {
 215         struct capiminor *mp;
 216         struct device *dev;
 217         unsigned int minor;
 218
 219         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 220         if (!mp) {
 221                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 222                 return NULL;
 223         }
 224
 225         kref_init(&mp->kref);
 226
 227         mp->ap = ap;
 228         mp->ncci = ncci;
 229         INIT_LIST_HEAD(&mp->ackqueue);
 230         spin_lock_init(&mp->ackqlock);
 231
 232         skb_queue_head_init(&mp->inqueue);
 233         skb_queue_head_init(&mp->outqueue);
 234
 235         tty_port_init(&mp->port);
 236         mp->port.ops = &capiminor_port_ops;
 237
 238         /* Allocate the least unused minor number. */
 239         spin_lock(&capiminors_lock);
 240         for (minor = 0; minor < capi_ttyminors; minor++)
 241                 if (!capiminors[minor]) {
 242                         capiminors[minor] = mp;
 243                         break;
 244                 }
 245         spin_unlock(&capiminors_lock);
 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         spin_lock(&capiminors_lock);
 262         capiminors[minor] = NULL;
 263         spin_unlock(&capiminors_lock);
 264
 265 err_out1:
 266         kfree(mp);
 267         return NULL;
 268 }
 269
 270 static void capiminor_destroy(struct kref *kref)
 271 {
 272         struct capiminor *mp = container_of(kref, struct capiminor, kref);
 273
 274         kfree_skb(mp->ttyskb);
 275         skb_queue_purge(&mp->inqueue);
 276         skb_queue_purge(&mp->outqueue);
 277         capiminor_del_all_ack(mp);
 278         kfree(mp);
 279 }
 280
 281 static struct capiminor *capiminor_get(unsigned int minor)
 282 {
 283         struct capiminor *mp;
 284
 285         spin_lock(&capiminors_lock);
 286         mp = capiminors[minor];
 287         if (mp)
 288                 kref_get(&mp->kref);
 289         spin_unlock(&capiminors_lock);
 290
 291         return mp;
 292 }
 293
 294 static inline void capiminor_put(struct capiminor *mp)
 295 {
 296         kref_put(&mp->kref, capiminor_destroy);
 297 }
 298
 299 static void capiminor_free(struct capiminor *mp)
 300 {
 301         tty_unregister_device(capinc_tty_driver, mp->minor);
 302
 303         spin_lock(&capiminors_lock);
 304         capiminors[mp->minor] = NULL;
 305         spin_unlock(&capiminors_lock);
 306
 307         capiminor_put(mp);
 308 }
 309
 310 /* -------- struct capincci ----------------------------------------- */
 311
 312 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 313 {
 314         struct capiminor *mp;
 315         dev_t device;
 316
 317         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 318                 return;
 319
 320         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 321         if (mp) {
 322                 device = MKDEV(capinc_tty_driver->major, mp->minor);
 323                 mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
 324         }
 325 }
 326
 327 static void capincci_free_minor(struct capincci *np)
 328 {
 329         struct capiminor *mp = np->minorp;
 330         struct tty_struct *tty;
 331
 332         if (mp) {
 333                 capifs_free_ncci(mp->capifs_dentry);
 334
 335                 tty = tty_port_tty_get(&mp->port);
 336                 if (tty) {
 337                         tty_vhangup(tty);
 338                         tty_kref_put(tty);
 339                 }
 340
 341                 capiminor_free(mp);
 342         }
 343 }
 344
 345 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 346 {
 347         struct capiminor *mp = np->minorp;
 348         unsigned int count = 0;
 349         struct tty_struct *tty;
 350
 351         if (mp) {
 352                 tty = tty_port_tty_get(&mp->port);
 353                 if (tty) {
 354                         count = tty->count;
 355                         tty_kref_put(tty);
 356                 }
 357         }
 358         return count;
 359 }
 360
 361 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 362
 363 static inline void
 364 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 365 static inline void capincci_free_minor(struct capincci *np) { }
 366
 367 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 368 {
 369         return 0;
 370 }
 371
 372 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 373
 374 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 375 {
 376         struct capincci *np;
 377
 378         np = kzalloc(sizeof(*np), GFP_KERNEL);
 379         if (!np)
 380                 return NULL;
 381         np->ncci = ncci;
 382         np->cdev = cdev;
 383
 384         capincci_alloc_minor(cdev, np);
 385
 386         list_add_tail(&np->list, &cdev->nccis);
 387
 388         return np;
 389 }
 390
 391 static void capincci_free(struct capidev *cdev, u32 ncci)
 392 {
 393         struct capincci *np, *tmp;
 394
 395         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 396                 if (ncci == 0xffffffff || np->ncci == ncci) {
 397                         capincci_free_minor(np);
 398                         list_del(&np->list);
 399                         kfree(np);
 400                 }
 401 }
 402
 403 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 404 {
 405         struct capincci *np;
 406
 407         list_for_each_entry(np, &cdev->nccis, list)
 408                 if (np->ncci == ncci)
 409                         return np;
 410         return NULL;
 411 }
 412
 413 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 414 /* -------- handle data queue --------------------------------------- */
 415
 416 static struct sk_buff *
 417 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 418 {
 419         struct sk_buff *nskb;
 420         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 421         if (nskb) {
 422                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 423                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 424                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 425                 capimsg_setu16(s, 2, mp->ap->applid);
 426                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 427                 capimsg_setu8 (s, 5, CAPI_RESP);
 428                 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
 429                 capimsg_setu32(s, 8, mp->ncci);
 430                 capimsg_setu16(s, 12, datahandle);
 431         }
 432         return nskb;
 433 }
 434
 435 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 436 {
 437         unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
 438         struct tty_struct *tty;
 439         struct sk_buff *nskb;
 440         u16 errcode, datahandle;
 441         struct tty_ldisc *ld;
 442         int ret = -1;
 443
 444         tty = tty_port_tty_get(&mp->port);
 445         if (!tty) {
 446 #ifdef _DEBUG_DATAFLOW
 447                 printk(KERN_DEBUG "capi: currently no receiver\n");
 448 #endif
 449                 return -1;
 450         }
 451
 452         ld = tty_ldisc_ref(tty);
 453         if (!ld) {
 454                 /* fatal error, do not requeue */
 455                 ret = 0;
 456                 kfree_skb(skb);
 457                 goto deref_tty;
 458         }
 459
 460         if (ld->ops->receive_buf == NULL) {
 461 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 462                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 463 #endif
 464                 /* fatal error, do not requeue */
 465                 goto free_skb;
 466         }
 467         if (mp->ttyinstop) {
 468 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 469                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 470 #endif
 471                 goto deref_ldisc;
 472         }
 473
 474         if (tty->receive_room < datalen) {
 475 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 476                 printk(KERN_DEBUG "capi: no room in tty\n");
 477 #endif
 478                 goto deref_ldisc;
 479         }
 480
 481         nskb = gen_data_b3_resp_for(mp, skb);
 482         if (!nskb) {
 483                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 484                 goto deref_ldisc;
 485         }
 486
 487         datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 488
 489         errcode = capi20_put_message(mp->ap, nskb);
 490
 491         if (errcode == CAPI_NOERROR) {
 492                 skb_pull(skb, CAPIMSG_LEN(skb->data));
 493 #ifdef _DEBUG_DATAFLOW
 494                 printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 495                                         datahandle, skb->len);
 496 #endif
 497                 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 498         } else {
 499                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 500                                 errcode);
 501                 kfree_skb(nskb);
 502
 503                 if (errcode == CAPI_SENDQUEUEFULL)
 504                         goto deref_ldisc;
 505         }
 506
 507 free_skb:
 508         ret = 0;
 509         kfree_skb(skb);
 510
 511 deref_ldisc:
 512         tty_ldisc_deref(ld);
 513
 514 deref_tty:
 515         tty_kref_put(tty);
 516         return ret;
 517 }
 518
 519 static void handle_minor_recv(struct capiminor *mp)
 520 {
 521         struct sk_buff *skb;
 522
 523         while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
 524                 if (handle_recv_skb(mp, skb) < 0) {
 525                         skb_queue_head(&mp->inqueue, skb);
 526                         return;
 527                 }
 528 }
 529
 530 static int handle_minor_send(struct capiminor *mp)
 531 {
 532         struct tty_struct *tty;
 533         struct sk_buff *skb;
 534         u16 len;
 535         int count = 0;
 536         u16 errcode;
 537         u16 datahandle;
 538
 539         tty = tty_port_tty_get(&mp->port);
 540         if (!tty)
 541                 return 0;
 542
 543         if (mp->ttyoutstop) {
 544 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 545                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 546 #endif
 547                 tty_kref_put(tty);
 548                 return 0;
 549         }
 550
 551         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 552                 datahandle = atomic_inc_return(&mp->datahandle);
 553                 len = (u16)skb->len;
 554                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 555                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 556                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 557                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 558                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 559                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 560                 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
 561                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 562                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 563                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 564                 capimsg_setu16(skb->data, 18, datahandle);
 565                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 566
 567                 if (capiminor_add_ack(mp, datahandle) < 0) {
 568                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 569                         skb_queue_head(&mp->outqueue, skb);
 570                         tty_kref_put(tty);
 571                         return count;
 572                 }
 573                 errcode = capi20_put_message(mp->ap, skb);
 574                 if (errcode == CAPI_NOERROR) {
 575                         count++;
 576                         mp->outbytes -= len;
 577 #ifdef _DEBUG_DATAFLOW
 578                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 579                                                         datahandle, len);
 580 #endif
 581                         continue;
 582                 }
 583                 capiminor_del_ack(mp, datahandle);
 584
 585                 if (errcode == CAPI_SENDQUEUEFULL) {
 586                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 587                         skb_queue_head(&mp->outqueue, skb);
 588                         break;
 589                 }
 590
 591                 /* ups, drop packet */
 592                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 593                 mp->outbytes -= len;
 594                 kfree_skb(skb);
 595         }
 596         tty_kref_put(tty);
 597         return count;
 598 }
 599
 600 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 601 /* -------- function called by lower level -------------------------- */
 602
 603 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 604 {
 605         struct capidev *cdev = ap->private;
 606 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 607         struct tty_struct *tty;
 608         struct capiminor *mp;
 609         u16 datahandle;
 610 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 611         struct capincci *np;
 612         unsigned long flags;
 613
 614         mutex_lock(&cdev->lock);
 615
 616         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 617                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 618                 if ((info & 0xff00) == 0)
 619                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 620         }
 621         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 622                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 623
 624         spin_lock_irqsave(&workaround_lock, flags);
 625         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 626                 skb_queue_tail(&cdev->recvqueue, skb);
 627                 wake_up_interruptible(&cdev->recvwait);
 628                 goto unlock_out;
 629         }
 630
 631         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 632         if (!np) {
 633                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 634                 skb_queue_tail(&cdev->recvqueue, skb);
 635                 wake_up_interruptible(&cdev->recvwait);
 636                 goto unlock_out;
 637         }
 638
 639 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 640         skb_queue_tail(&cdev->recvqueue, skb);
 641         wake_up_interruptible(&cdev->recvwait);
 642
 643 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 644
 645         mp = np->minorp;
 646         if (!mp) {
 647                 skb_queue_tail(&cdev->recvqueue, skb);
 648                 wake_up_interruptible(&cdev->recvwait);
 649                 goto unlock_out;
 650         }
 651         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 652                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 653 #ifdef _DEBUG_DATAFLOW
 654                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 655                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 656 #endif
 657                 skb_queue_tail(&mp->inqueue, skb);
 658
 659                 handle_minor_recv(mp);
 660
 661         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 662
 663                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 664 #ifdef _DEBUG_DATAFLOW
 665                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 666                                 datahandle,
 667                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 668 #endif
 669                 kfree_skb(skb);
 670                 (void)capiminor_del_ack(mp, datahandle);
 671                 tty = tty_port_tty_get(&mp->port);
 672                 if (tty) {
 673                         tty_wakeup(tty);
 674                         tty_kref_put(tty);
 675                 }
 676                 (void)handle_minor_send(mp);
 677
 678         } else {
 679                 /* ups, let capi application handle it :-) */
 680                 skb_queue_tail(&cdev->recvqueue, skb);
 681                 wake_up_interruptible(&cdev->recvwait);
 682         }
 683 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 684
 685 unlock_out:
 686         spin_unlock_irqrestore(&workaround_lock, flags);
 687         mutex_unlock(&cdev->lock);
 688 }
 689
 690 /* -------- file_operations for capidev ----------------------------- */
 691
 692 static ssize_t
 693 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 694 {
 695         struct capidev *cdev = (struct capidev *)file->private_data;
 696         struct sk_buff *skb;
 697         size_t copied;
 698         int err;
 699
 700         if (!cdev->ap.applid)
 701                 return -ENODEV;
 702
 703         skb = skb_dequeue(&cdev->recvqueue);
 704         if (!skb) {
 705                 if (file->f_flags & O_NONBLOCK)
 706                         return -EAGAIN;
 707                 err = wait_event_interruptible(cdev->recvwait,
 708                                 (skb = skb_dequeue(&cdev->recvqueue)));
 709                 if (err)
 710                         return err;
 711         }
 712         if (skb->len > count) {
 713                 skb_queue_head(&cdev->recvqueue, skb);
 714                 return -EMSGSIZE;
 715         }
 716         if (copy_to_user(buf, skb->data, skb->len)) {
 717                 skb_queue_head(&cdev->recvqueue, skb);
 718                 return -EFAULT;
 719         }
 720         copied = skb->len;
 721
 722         kfree_skb(skb);
 723
 724         return copied;
 725 }
 726
 727 static ssize_t
 728 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 729 {
 730         struct capidev *cdev = (struct capidev *)file->private_data;
 731         struct sk_buff *skb;
 732         u16 mlen;
 733
 734         if (!cdev->ap.applid)
 735                 return -ENODEV;
 736
 737         skb = alloc_skb(count, GFP_USER);
 738         if (!skb)
 739                 return -ENOMEM;
 740
 741         if (copy_from_user(skb_put(skb, count), buf, count)) {
 742                 kfree_skb(skb);
 743                 return -EFAULT;
 744         }
 745         mlen = CAPIMSG_LEN(skb->data);
 746         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 747                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 748                         kfree_skb(skb);
 749                         return -EINVAL;
 750                 }
 751         } else {
 752                 if (mlen != count) {
 753                         kfree_skb(skb);
 754                         return -EINVAL;
 755                 }
 756         }
 757         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 758
 759         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 760                 mutex_lock(&cdev->lock);
 761                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 762                 mutex_unlock(&cdev->lock);
 763         }
 764
 765         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 766
 767         if (cdev->errcode) {
 768                 kfree_skb(skb);
 769                 return -EIO;
 770         }
 771         return count;
 772 }
 773
 774 static unsigned int
 775 capi_poll(struct file *file, poll_table * wait)
 776 {
 777         struct capidev *cdev = (struct capidev *)file->private_data;
 778         unsigned int mask = 0;
 779
 780         if (!cdev->ap.applid)
 781                 return POLLERR;
 782
 783         poll_wait(file, &(cdev->recvwait), wait);
 784         mask = POLLOUT | POLLWRNORM;
 785         if (!skb_queue_empty(&cdev->recvqueue))
 786                 mask |= POLLIN | POLLRDNORM;
 787         return mask;
 788 }
 789
 790 static int
 791 capi_ioctl(struct inode *inode, struct file *file,
 792            unsigned int cmd, unsigned long arg)
 793 {
 794         struct capidev *cdev = file->private_data;
 795         capi_ioctl_struct data;
 796         int retval = -EINVAL;
 797         void __user *argp = (void __user *)arg;
 798
 799         switch (cmd) {
 800         case CAPI_REGISTER:
 801                 mutex_lock(&cdev->lock);
 802
 803                 if (cdev->ap.applid) {
 804                         retval = -EEXIST;
 805                         goto register_out;
 806                 }
 807                 if (copy_from_user(&cdev->ap.rparam, argp,
 808                                    sizeof(struct capi_register_params))) {
 809                         retval = -EFAULT;
 810                         goto register_out;
 811                 }
 812                 cdev->ap.private = cdev;
 813                 cdev->ap.recv_message = capi_recv_message;
 814                 cdev->errcode = capi20_register(&cdev->ap);
 815                 retval = (int)cdev->ap.applid;
 816                 if (cdev->errcode) {
 817                         cdev->ap.applid = 0;
 818                         retval = -EIO;
 819                 }
 820
 821 register_out:
 822                 mutex_unlock(&cdev->lock);
 823                 return retval;
 824
 825         case CAPI_GET_VERSION:
 826                 {
 827                         if (copy_from_user(&data.contr, argp,
 828                                                 sizeof(data.contr)))
 829                                 return -EFAULT;
 830                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 831                         if (cdev->errcode)
 832                                 return -EIO;
 833                         if (copy_to_user(argp, &data.version,
 834                                          sizeof(data.version)))
 835                                 return -EFAULT;
 836                 }
 837                 return 0;
 838
 839         case CAPI_GET_SERIAL:
 840                 {
 841                         if (copy_from_user(&data.contr, argp,
 842                                            sizeof(data.contr)))
 843                                 return -EFAULT;
 844                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 845                         if (cdev->errcode)
 846                                 return -EIO;
 847                         if (copy_to_user(argp, data.serial,
 848                                          sizeof(data.serial)))
 849                                 return -EFAULT;
 850                 }
 851                 return 0;
 852         case CAPI_GET_PROFILE:
 853                 {
 854                         if (copy_from_user(&data.contr, argp,
 855                                            sizeof(data.contr)))
 856                                 return -EFAULT;
 857
 858                         if (data.contr == 0) {
 859                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 860                                 if (cdev->errcode)
 861                                         return -EIO;
 862
 863                                 retval = copy_to_user(argp,
 864                                       &data.profile.ncontroller,
 865                                        sizeof(data.profile.ncontroller));
 866
 867                         } else {
 868                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 869                                 if (cdev->errcode)
 870                                         return -EIO;
 871
 872                                 retval = copy_to_user(argp, &data.profile,
 873                                                    sizeof(data.profile));
 874                         }
 875                         if (retval)
 876                                 return -EFAULT;
 877                 }
 878                 return 0;
 879
 880         case CAPI_GET_MANUFACTURER:
 881                 {
 882                         if (copy_from_user(&data.contr, argp,
 883                                            sizeof(data.contr)))
 884                                 return -EFAULT;
 885                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 886                         if (cdev->errcode)
 887                                 return -EIO;
 888
 889                         if (copy_to_user(argp, data.manufacturer,
 890                                          sizeof(data.manufacturer)))
 891                                 return -EFAULT;
 892
 893                 }
 894                 return 0;
 895         case CAPI_GET_ERRCODE:
 896                 data.errcode = cdev->errcode;
 897                 cdev->errcode = CAPI_NOERROR;
 898                 if (arg) {
 899                         if (copy_to_user(argp, &data.errcode,
 900                                          sizeof(data.errcode)))
 901                                 return -EFAULT;
 902                 }
 903                 return data.errcode;
 904
 905         case CAPI_INSTALLED:
 906                 if (capi20_isinstalled() == CAPI_NOERROR)
 907                         return 0;
 908                 return -ENXIO;
 909
 910         case CAPI_MANUFACTURER_CMD:
 911                 {
 912                         struct capi_manufacturer_cmd mcmd;
 913                         if (!capable(CAP_SYS_ADMIN))
 914                                 return -EPERM;
 915                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 916                                 return -EFAULT;
 917                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 918                 }
 919                 return 0;
 920
 921         case CAPI_SET_FLAGS:
 922         case CAPI_CLR_FLAGS: {
 923                 unsigned userflags;
 924
 925                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 926                         return -EFAULT;
 927
 928                 mutex_lock(&cdev->lock);
 929                 if (cmd == CAPI_SET_FLAGS)
 930                         cdev->userflags |= userflags;
 931                 else
 932                         cdev->userflags &= ~userflags;
 933                 mutex_unlock(&cdev->lock);
 934                 return 0;
 935         }
 936         case CAPI_GET_FLAGS:
 937                 if (copy_to_user(argp, &cdev->userflags,
 938                                  sizeof(cdev->userflags)))
 939                         return -EFAULT;
 940                 return 0;
 941
 942         case CAPI_NCCI_OPENCOUNT: {
 943                 struct capincci *nccip;
 944                 unsigned ncci;
 945                 int count = 0;
 946
 947                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 948                         return -EFAULT;
 949
 950                 mutex_lock(&cdev->lock);
 951                 nccip = capincci_find(cdev, (u32)ncci);
 952                 if (nccip)
 953                         count = capincci_minor_opencount(nccip);
 954                 mutex_unlock(&cdev->lock);
 955                 return count;
 956         }
 957
 958 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 959         case CAPI_NCCI_GETUNIT: {
 960                 struct capincci *nccip;
 961                 struct capiminor *mp;
 962                 unsigned ncci;
 963                 int unit = -ESRCH;
 964
 965                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 966                         return -EFAULT;
 967
 968                 mutex_lock(&cdev->lock);
 969                 nccip = capincci_find(cdev, (u32)ncci);
 970                 if (nccip) {
 971                         mp = nccip->minorp;
 972                         if (mp)
 973                                 unit = mp->minor;
 974                 }
 975                 mutex_unlock(&cdev->lock);
 976                 return unit;
 977         }
 978 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 979
 980         default:
 981                 return -EINVAL;
 982         }
 983 }
 984
 985 static int capi_open(struct inode *inode, struct file *file)
 986 {
 987         struct capidev *cdev;
 988
 989         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 990         if (!cdev)
 991                 return -ENOMEM;
 992
 993         mutex_init(&cdev->lock);
 994         skb_queue_head_init(&cdev->recvqueue);
 995         init_waitqueue_head(&cdev->recvwait);
 996         INIT_LIST_HEAD(&cdev->nccis);
 997         file->private_data = cdev;
 998
 999         mutex_lock(&capidev_list_lock);
1000         list_add_tail(&cdev->list, &capidev_list);
1001         mutex_unlock(&capidev_list_lock);
1002
1003         return nonseekable_open(inode, file);
1004 }
1005
1006 static int capi_release(struct inode *inode, struct file *file)
1007 {
1008         struct capidev *cdev = file->private_data;
1009
1010         mutex_lock(&capidev_list_lock);
1011         list_del(&cdev->list);
1012         mutex_unlock(&capidev_list_lock);
1013
1014         if (cdev->ap.applid)
1015                 capi20_release(&cdev->ap);
1016         skb_queue_purge(&cdev->recvqueue);
1017         capincci_free(cdev, 0xffffffff);
1018
1019         kfree(cdev);
1020         return 0;
1021 }
1022
1023 static const struct file_operations capi_fops =
1024 {
1025         .owner          = THIS_MODULE,
1026         .llseek         = no_llseek,
1027         .read           = capi_read,
1028         .write          = capi_write,
1029         .poll           = capi_poll,
1030         .ioctl          = capi_ioctl,
1031         .open           = capi_open,
1032         .release        = capi_release,
1033 };
1034
1035 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1036 /* -------- tty_operations for capincci ----------------------------- */
1037
1038 static int
1039 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1040 {
1041         int idx = tty->index;
1042         struct capiminor *mp = capiminor_get(idx);
1043         int ret = tty_init_termios(tty);
1044
1045         if (ret == 0) {
1046                 tty_driver_kref_get(driver);
1047                 tty->count++;
1048                 tty->driver_data = mp;
1049                 driver->ttys[idx] = tty;
1050         } else
1051                 capiminor_put(mp);
1052         return ret;
1053 }
1054
1055 static void capinc_tty_cleanup(struct tty_struct *tty)
1056 {
1057         struct capiminor *mp = tty->driver_data;
1058         tty->driver_data = NULL;
1059         capiminor_put(mp);
1060 }
1061
1062 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1063 {
1064         struct capiminor *mp = tty->driver_data;
1065         unsigned long flags;
1066         int err;
1067
1068         err = tty_port_open(&mp->port, tty, filp);
1069         if (err)
1070                 return err;
1071
1072         spin_lock_irqsave(&workaround_lock, flags);
1073         handle_minor_recv(mp);
1074         spin_unlock_irqrestore(&workaround_lock, flags);
1075         return 0;
1076 }
1077
1078 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1079 {
1080         struct capiminor *mp = tty->driver_data;
1081
1082         tty_port_close(&mp->port, tty, filp);
1083 }
1084
1085 static int capinc_tty_write(struct tty_struct *tty,
1086                             const unsigned char *buf, int count)
1087 {
1088         struct capiminor *mp = tty->driver_data;
1089         struct sk_buff *skb;
1090         unsigned long flags;
1091
1092 #ifdef _DEBUG_TTYFUNCS
1093         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1094 #endif
1095
1096         spin_lock_irqsave(&workaround_lock, flags);
1097         skb = mp->ttyskb;
1098         if (skb) {
1099                 mp->ttyskb = NULL;
1100                 skb_queue_tail(&mp->outqueue, skb);
1101                 mp->outbytes += skb->len;
1102         }
1103
1104         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1105         if (!skb) {
1106                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1107                 spin_unlock_irqrestore(&workaround_lock, flags);
1108                 return -ENOMEM;
1109         }
1110
1111         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1112         memcpy(skb_put(skb, count), buf, count);
1113
1114         skb_queue_tail(&mp->outqueue, skb);
1115         mp->outbytes += skb->len;
1116         (void)handle_minor_send(mp);
1117         spin_unlock_irqrestore(&workaround_lock, flags);
1118         return count;
1119 }
1120
1121 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1122 {
1123         struct capiminor *mp = tty->driver_data;
1124         struct sk_buff *skb;
1125         unsigned long flags;
1126         int ret = 1;
1127
1128 #ifdef _DEBUG_TTYFUNCS
1129         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1130 #endif
1131
1132         spin_lock_irqsave(&workaround_lock, flags);
1133         skb = mp->ttyskb;
1134         if (skb) {
1135                 if (skb_tailroom(skb) > 0) {
1136                         *(skb_put(skb, 1)) = ch;
1137                         spin_unlock_irqrestore(&workaround_lock, flags);
1138                         return 1;
1139                 }
1140                 mp->ttyskb = NULL;
1141                 skb_queue_tail(&mp->outqueue, skb);
1142                 mp->outbytes += skb->len;
1143                 (void)handle_minor_send(mp);
1144         }
1145         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1146         if (skb) {
1147                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1148                 *(skb_put(skb, 1)) = ch;
1149                 mp->ttyskb = skb;
1150         } else {
1151                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1152                 ret = 0;
1153         }
1154         spin_unlock_irqrestore(&workaround_lock, flags);
1155         return ret;
1156 }
1157
1158 static void capinc_tty_flush_chars(struct tty_struct *tty)
1159 {
1160         struct capiminor *mp = tty->driver_data;
1161         struct sk_buff *skb;
1162         unsigned long flags;
1163
1164 #ifdef _DEBUG_TTYFUNCS
1165         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1166 #endif
1167
1168         spin_lock_irqsave(&workaround_lock, flags);
1169         skb = mp->ttyskb;
1170         if (skb) {
1171                 mp->ttyskb = NULL;
1172                 skb_queue_tail(&mp->outqueue, skb);
1173                 mp->outbytes += skb->len;
1174                 (void)handle_minor_send(mp);
1175         }
1176         (void)handle_minor_recv(mp);
1177         spin_unlock_irqrestore(&workaround_lock, flags);
1178 }
1179
1180 static int capinc_tty_write_room(struct tty_struct *tty)
1181 {
1182         struct capiminor *mp = tty->driver_data;
1183         int room;
1184
1185         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1186         room *= CAPI_MAX_BLKSIZE;
1187 #ifdef _DEBUG_TTYFUNCS
1188         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1189 #endif
1190         return room;
1191 }
1192
1193 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1194 {
1195         struct capiminor *mp = tty->driver_data;
1196
1197 #ifdef _DEBUG_TTYFUNCS
1198         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1199                         mp->outbytes, mp->nack,
1200                         skb_queue_len(&mp->outqueue),
1201                         skb_queue_len(&mp->inqueue));
1202 #endif
1203         return mp->outbytes;
1204 }
1205
1206 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1207                     unsigned int cmd, unsigned long arg)
1208 {
1209         int error = 0;
1210         switch (cmd) {
1211         default:
1212                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1213                 break;
1214         }
1215         return error;
1216 }
1217
1218 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1219 {
1220 #ifdef _DEBUG_TTYFUNCS
1221         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1222 #endif
1223 }
1224
1225 static void capinc_tty_throttle(struct tty_struct *tty)
1226 {
1227         struct capiminor *mp = tty->driver_data;
1228 #ifdef _DEBUG_TTYFUNCS
1229         printk(KERN_DEBUG "capinc_tty_throttle\n");
1230 #endif
1231         mp->ttyinstop = 1;
1232 }
1233
1234 static void capinc_tty_unthrottle(struct tty_struct *tty)
1235 {
1236         struct capiminor *mp = tty->driver_data;
1237         unsigned long flags;
1238
1239 #ifdef _DEBUG_TTYFUNCS
1240         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1241 #endif
1242         spin_lock_irqsave(&workaround_lock, flags);
1243         mp->ttyinstop = 0;
1244         handle_minor_recv(mp);
1245         spin_unlock_irqrestore(&workaround_lock, flags);
1246 }
1247
1248 static void capinc_tty_stop(struct tty_struct *tty)
1249 {
1250         struct capiminor *mp = tty->driver_data;
1251
1252 #ifdef _DEBUG_TTYFUNCS
1253         printk(KERN_DEBUG "capinc_tty_stop\n");
1254 #endif
1255         mp->ttyoutstop = 1;
1256 }
1257
1258 static void capinc_tty_start(struct tty_struct *tty)
1259 {
1260         struct capiminor *mp = tty->driver_data;
1261         unsigned long flags;
1262
1263 #ifdef _DEBUG_TTYFUNCS
1264         printk(KERN_DEBUG "capinc_tty_start\n");
1265 #endif
1266         spin_lock_irqsave(&workaround_lock, flags);
1267         mp->ttyoutstop = 0;
1268         (void)handle_minor_send(mp);
1269         spin_unlock_irqrestore(&workaround_lock, flags);
1270 }
1271
1272 static void capinc_tty_hangup(struct tty_struct *tty)
1273 {
1274         struct capiminor *mp = tty->driver_data;
1275
1276 #ifdef _DEBUG_TTYFUNCS
1277         printk(KERN_DEBUG "capinc_tty_hangup\n");
1278 #endif
1279         tty_port_hangup(&mp->port);
1280 }
1281
1282 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1283 {
1284 #ifdef _DEBUG_TTYFUNCS
1285         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1286 #endif
1287         return 0;
1288 }
1289
1290 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1291 {
1292 #ifdef _DEBUG_TTYFUNCS
1293         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1294 #endif
1295 }
1296
1297 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1298 {
1299 #ifdef _DEBUG_TTYFUNCS
1300         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1301 #endif
1302 }
1303
1304 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1305 {
1306 #ifdef _DEBUG_TTYFUNCS
1307         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1308 #endif
1309 }
1310
1311 static const struct tty_operations capinc_ops = {
1312         .open = capinc_tty_open,
1313         .close = capinc_tty_close,
1314         .write = capinc_tty_write,
1315         .put_char = capinc_tty_put_char,
1316         .flush_chars = capinc_tty_flush_chars,
1317         .write_room = capinc_tty_write_room,
1318         .chars_in_buffer = capinc_tty_chars_in_buffer,
1319         .ioctl = capinc_tty_ioctl,
1320         .set_termios = capinc_tty_set_termios,
1321         .throttle = capinc_tty_throttle,
1322         .unthrottle = capinc_tty_unthrottle,
1323         .stop = capinc_tty_stop,
1324         .start = capinc_tty_start,
1325         .hangup = capinc_tty_hangup,
1326         .break_ctl = capinc_tty_break_ctl,
1327         .flush_buffer = capinc_tty_flush_buffer,
1328         .set_ldisc = capinc_tty_set_ldisc,
1329         .send_xchar = capinc_tty_send_xchar,
1330         .install = capinc_tty_install,
1331         .cleanup = capinc_tty_cleanup,
1332 };
1333
1334 static int __init capinc_tty_init(void)
1335 {
1336         struct tty_driver *drv;
1337         int err;
1338
1339         if (capi_ttyminors > CAPINC_MAX_PORTS)
1340                 capi_ttyminors = CAPINC_MAX_PORTS;
1341         if (capi_ttyminors <= 0)
1342                 capi_ttyminors = CAPINC_NR_PORTS;
1343
1344         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1345                              GFP_KERNEL);
1346         if (!capiminors)
1347                 return -ENOMEM;
1348
1349         drv = alloc_tty_driver(capi_ttyminors);
1350         if (!drv) {
1351                 kfree(capiminors);
1352                 return -ENOMEM;
1353         }
1354         drv->owner = THIS_MODULE;
1355         drv->driver_name = "capi_nc";
1356         drv->name = "capi";
1357         drv->major = 0;
1358         drv->minor_start = 0;
1359         drv->type = TTY_DRIVER_TYPE_SERIAL;
1360         drv->subtype = SERIAL_TYPE_NORMAL;
1361         drv->init_termios = tty_std_termios;
1362         drv->init_termios.c_iflag = ICRNL;
1363         drv->init_termios.c_oflag = OPOST | ONLCR;
1364         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1365         drv->init_termios.c_lflag = 0;
1366         drv->flags =
1367                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1368                 TTY_DRIVER_DYNAMIC_DEV;
1369         tty_set_operations(drv, &capinc_ops);
1370
1371         err = tty_register_driver(drv);
1372         if (err) {
1373                 put_tty_driver(drv);
1374                 kfree(capiminors);
1375                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1376                 return err;
1377         }
1378         capinc_tty_driver = drv;
1379         return 0;
1380 }
1381
1382 static void __exit capinc_tty_exit(void)
1383 {
1384         tty_unregister_driver(capinc_tty_driver);
1385         put_tty_driver(capinc_tty_driver);
1386         kfree(capiminors);
1387 }
1388
1389 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1390
1391 static inline int capinc_tty_init(void)
1392 {
1393         return 0;
1394 }
1395
1396 static inline void capinc_tty_exit(void) { }
1397
1398 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1399
1400 /* -------- /proc functions ----------------------------------------- */
1401
1402 /*
1403  * /proc/capi/capi20:
1404  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1405  */
1406 static int capi20_proc_show(struct seq_file *m, void *v)
1407 {
1408         struct capidev *cdev;
1409         struct list_head *l;
1410
1411         mutex_lock(&capidev_list_lock);
1412         list_for_each(l, &capidev_list) {
1413                 cdev = list_entry(l, struct capidev, list);
1414                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1415                         cdev->ap.applid,
1416                         cdev->ap.nrecvctlpkt,
1417                         cdev->ap.nrecvdatapkt,
1418                         cdev->ap.nsentctlpkt,
1419                         cdev->ap.nsentdatapkt);
1420         }
1421         mutex_unlock(&capidev_list_lock);
1422         return 0;
1423 }
1424
1425 static int capi20_proc_open(struct inode *inode, struct file *file)
1426 {
1427         return single_open(file, capi20_proc_show, NULL);
1428 }
1429
1430 static const struct file_operations capi20_proc_fops = {
1431         .owner          = THIS_MODULE,
1432         .open           = capi20_proc_open,
1433         .read           = seq_read,
1434         .llseek         = seq_lseek,
1435         .release        = single_release,
1436 };
1437
1438 /*
1439  * /proc/capi/capi20ncci:
1440  *  applid ncci
1441  */
1442 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1443 {
1444         struct capidev *cdev;
1445         struct capincci *np;
1446
1447         mutex_lock(&capidev_list_lock);
1448         list_for_each_entry(cdev, &capidev_list, list) {
1449                 mutex_lock(&cdev->lock);
1450                 list_for_each_entry(np, &cdev->nccis, list)
1451                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1452                 mutex_unlock(&cdev->lock);
1453         }
1454         mutex_unlock(&capidev_list_lock);
1455         return 0;
1456 }
1457
1458 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1459 {
1460         return single_open(file, capi20ncci_proc_show, NULL);
1461 }
1462
1463 static const struct file_operations capi20ncci_proc_fops = {
1464         .owner          = THIS_MODULE,
1465         .open           = capi20ncci_proc_open,
1466         .read           = seq_read,
1467         .llseek         = seq_lseek,
1468         .release        = single_release,
1469 };
1470
1471 static void __init proc_init(void)
1472 {
1473         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1474         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1475 }
1476
1477 static void __exit proc_exit(void)
1478 {
1479         remove_proc_entry("capi/capi20", NULL);
1480         remove_proc_entry("capi/capi20ncci", NULL);
1481 }
1482
1483 /* -------- init function and module interface ---------------------- */
1484
1485
1486 static int __init capi_init(void)
1487 {
1488         const char *compileinfo;
1489         int major_ret;
1490
1491         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1492         if (major_ret < 0) {
1493                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1494                 return major_ret;
1495         }
1496         capi_class = class_create(THIS_MODULE, "capi");
1497         if (IS_ERR(capi_class)) {
1498                 unregister_chrdev(capi_major, "capi20");
1499                 return PTR_ERR(capi_class);
1500         }
1501
1502         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1503
1504         if (capinc_tty_init() < 0) {
1505                 device_destroy(capi_class, MKDEV(capi_major, 0));
1506                 class_destroy(capi_class);
1507                 unregister_chrdev(capi_major, "capi20");
1508                 return -ENOMEM;
1509         }
1510
1511         proc_init();
1512
1513 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1514         compileinfo = " (middleware+capifs)";
1515 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1516         compileinfo = " (no capifs)";
1517 #else
1518         compileinfo = " (no middleware)";
1519 #endif
1520         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1521                capi_major, compileinfo);
1522
1523         return 0;
1524 }
1525
1526 static void __exit capi_exit(void)
1527 {
1528         proc_exit();
1529
1530         device_destroy(capi_class, MKDEV(capi_major, 0));
1531         class_destroy(capi_class);
1532         unregister_chrdev(capi_major, "capi20");
1533
1534         capinc_tty_exit();
1535 }
1536
1537 module_init(capi_init);
1538 module_exit(capi_exit);