drivers/isdn/capi/capi.c

   1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
   2  *
   3  * CAPI 2.0 Interface for Linux
   4  *
   5  * Copyright 1996 by Carsten Paeth <calle@calle.de>
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/major.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/fs.h>
  20 #include <linux/signal.h>
  21 #include <linux/mutex.h>
  22 #include <linux/mm.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/timer.h>
  25 #include <linux/wait.h>
  26 #include <linux/tty.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/ppp_defs.h>
  29 #include <linux/if_ppp.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/poll.h>
  34 #include <linux/capi.h>
  35 #include <linux/kernelcapi.h>
  36 #include <linux/init.h>
  37 #include <linux/device.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/isdn/capiutil.h>
  40 #include <linux/isdn/capicmd.h>
  41
  42 #include "capifs.h"
  43
  44 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  45 MODULE_AUTHOR("Carsten Paeth");
  46 MODULE_LICENSE("GPL");
  47
  48 #undef _DEBUG_REFCOUNT          /* alloc/free and open/close debug */
  49 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  50 #undef _DEBUG_DATAFLOW          /* data flow */
  51
  52 /* -------- driver information -------------------------------------- */
  53
  54 static struct class *capi_class;
  55 static int capi_major = 68;             /* allocated */
  56
  57 module_param_named(major, capi_major, uint, 0);
  58
  59 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  60 #define CAPINC_NR_PORTS         32
  61 #define CAPINC_MAX_PORTS        256
  62
  63 static int capi_ttyminors = CAPINC_NR_PORTS;
  64
  65 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  66 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  67
  68 /* -------- defines ------------------------------------------------- */
  69
  70 #define CAPINC_MAX_RECVQUEUE    10
  71 #define CAPINC_MAX_SENDQUEUE    10
  72 #define CAPI_MAX_BLKSIZE        2048
  73
  74 /* -------- data structures ----------------------------------------- */
  75
  76 struct capidev;
  77 struct capincci;
  78 struct capiminor;
  79
  80 struct datahandle_queue {
  81         struct list_head        list;
  82         u16                     datahandle;
  83 };
  84
  85 struct capiminor {
  86         struct kref kref;
  87
  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_port port;
  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 const struct tty_port_operations capiminor_port_ops; /* we have none */
 216
 217 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 218 {
 219         struct capiminor *mp;
 220         struct device *dev;
 221         unsigned int minor;
 222         unsigned long flags;
 223
 224         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 225         if (!mp) {
 226                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 227                 return NULL;
 228         }
 229
 230         kref_init(&mp->kref);
 231
 232         mp->ap = ap;
 233         mp->ncci = ncci;
 234         mp->msgid = 0;
 235         atomic_set(&mp->ttyopencount,0);
 236         INIT_LIST_HEAD(&mp->ackqueue);
 237         spin_lock_init(&mp->ackqlock);
 238
 239         skb_queue_head_init(&mp->inqueue);
 240         skb_queue_head_init(&mp->outqueue);
 241
 242         tty_port_init(&mp->port);
 243         mp->port.ops = &capiminor_port_ops;
 244
 245         /* Allocate the least unused minor number. */
 246         write_lock_irqsave(&capiminors_lock, flags);
 247         for (minor = 0; minor < capi_ttyminors; minor++)
 248                 if (!capiminors[minor]) {
 249                         capiminors[minor] = mp;
 250                         break;
 251                 }
 252         write_unlock_irqrestore(&capiminors_lock, flags);
 253
 254         if (minor == capi_ttyminors) {
 255                 printk(KERN_NOTICE "capi: out of minors\n");
 256                 goto err_out1;
 257         }
 258
 259         mp->minor = minor;
 260
 261         dev = tty_register_device(capinc_tty_driver, minor, NULL);
 262         if (IS_ERR(dev))
 263                 goto err_out2;
 264
 265         return mp;
 266
 267 err_out2:
 268         write_lock_irqsave(&capiminors_lock, flags);
 269         capiminors[minor] = NULL;
 270         write_unlock_irqrestore(&capiminors_lock, flags);
 271
 272 err_out1:
 273         kfree(mp);
 274         return NULL;
 275 }
 276
 277 static void capiminor_destroy(struct kref *kref)
 278 {
 279         struct capiminor *mp = container_of(kref, struct capiminor, kref);
 280
 281         kfree_skb(mp->ttyskb);
 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         if (mp)
 295                 kref_get(&mp->kref);
 296         read_unlock(&capiminors_lock);
 297
 298         return mp;
 299 }
 300
 301 static inline void capiminor_put(struct capiminor *mp)
 302 {
 303         kref_put(&mp->kref, capiminor_destroy);
 304 }
 305
 306 static void capiminor_free(struct capiminor *mp)
 307 {
 308         unsigned long flags;
 309
 310         tty_unregister_device(capinc_tty_driver, mp->minor);
 311
 312         write_lock_irqsave(&capiminors_lock, flags);
 313         capiminors[mp->minor] = NULL;
 314         write_unlock_irqrestore(&capiminors_lock, flags);
 315
 316         capiminor_put(mp);
 317 }
 318
 319 /* -------- struct capincci ----------------------------------------- */
 320
 321 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 322 {
 323         struct capiminor *mp;
 324         dev_t device;
 325
 326         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 327                 return;
 328
 329         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 330         if (mp) {
 331                 mp->nccip = np;
 332 #ifdef _DEBUG_REFCOUNT
 333                 printk(KERN_DEBUG "set mp->nccip\n");
 334 #endif
 335                 device = MKDEV(capinc_tty_driver->major, mp->minor);
 336                 mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
 337         }
 338 }
 339
 340 static void capincci_free_minor(struct capincci *np)
 341 {
 342         struct capiminor *mp = np->minorp;
 343         struct tty_struct *tty;
 344
 345         if (mp) {
 346                 capifs_free_ncci(mp->capifs_dentry);
 347
 348                 tty = tty_port_tty_get(&mp->port);
 349                 if (tty) {
 350                         mp->nccip = NULL;
 351 #ifdef _DEBUG_REFCOUNT
 352                         printk(KERN_DEBUG "reset mp->nccip\n");
 353 #endif
 354                         tty_hangup(tty);
 355                         tty_kref_put(tty);
 356                 }
 357
 358                 capiminor_free(mp);
 359         }
 360 }
 361
 362 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 363 {
 364         struct capiminor *mp = np->minorp;
 365
 366         return mp ? atomic_read(&mp->ttyopencount) : 0;
 367 }
 368
 369 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 370
 371 static inline void
 372 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 373 static inline void capincci_free_minor(struct capincci *np) { }
 374
 375 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 376 {
 377         return 0;
 378 }
 379
 380 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 381
 382 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 383 {
 384         struct capincci *np;
 385
 386         np = kzalloc(sizeof(*np), GFP_KERNEL);
 387         if (!np)
 388                 return NULL;
 389         np->ncci = ncci;
 390         np->cdev = cdev;
 391
 392         capincci_alloc_minor(cdev, np);
 393
 394         list_add_tail(&np->list, &cdev->nccis);
 395
 396         return np;
 397 }
 398
 399 static void capincci_free(struct capidev *cdev, u32 ncci)
 400 {
 401         struct capincci *np, *tmp;
 402
 403         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 404                 if (ncci == 0xffffffff || np->ncci == ncci) {
 405                         capincci_free_minor(np);
 406                         list_del(&np->list);
 407                         kfree(np);
 408                 }
 409 }
 410
 411 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 412 {
 413         struct capincci *np;
 414
 415         list_for_each_entry(np, &cdev->nccis, list)
 416                 if (np->ncci == ncci)
 417                         return np;
 418         return NULL;
 419 }
 420
 421 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 422 /* -------- handle data queue --------------------------------------- */
 423
 424 static struct sk_buff *
 425 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 426 {
 427         struct sk_buff *nskb;
 428         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 429         if (nskb) {
 430                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 431                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 432                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 433                 capimsg_setu16(s, 2, mp->ap->applid);
 434                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 435                 capimsg_setu8 (s, 5, CAPI_RESP);
 436                 capimsg_setu16(s, 6, mp->msgid++);
 437                 capimsg_setu32(s, 8, mp->ncci);
 438                 capimsg_setu16(s, 12, datahandle);
 439         }
 440         return nskb;
 441 }
 442
 443 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 444 {
 445         struct tty_struct *tty;
 446         struct sk_buff *nskb;
 447         int datalen;
 448         u16 errcode, datahandle;
 449         struct tty_ldisc *ld;
 450         int ret = -1;
 451
 452         datalen = skb->len - CAPIMSG_LEN(skb->data);
 453
 454         tty = tty_port_tty_get(&mp->port);
 455         if (!tty) {
 456 #ifdef _DEBUG_DATAFLOW
 457                 printk(KERN_DEBUG "capi: currently no receiver\n");
 458 #endif
 459                 return -1;
 460         }
 461
 462         ld = tty_ldisc_ref(tty);
 463         if (!ld)
 464                 goto out1;
 465
 466         if (ld->ops->receive_buf == NULL) {
 467 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 468                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 469 #endif
 470                 goto out2;
 471         }
 472         if (mp->ttyinstop) {
 473 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 474                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 475 #endif
 476                 goto out2;
 477         }
 478         if (tty->receive_room < datalen) {
 479 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 480                 printk(KERN_DEBUG "capi: no room in tty\n");
 481 #endif
 482                 goto out2;
 483         }
 484         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 485                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 486                 goto out2;
 487         }
 488         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 489         errcode = capi20_put_message(mp->ap, nskb);
 490         if (errcode != CAPI_NOERROR) {
 491                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 492                                 errcode);
 493                 kfree_skb(nskb);
 494                 goto out2;
 495         }
 496         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 497 #ifdef _DEBUG_DATAFLOW
 498         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 499                                 datahandle, skb->len);
 500 #endif
 501         ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 502         kfree_skb(skb);
 503         ret = 0;
 504 out2:
 505         tty_ldisc_deref(ld);
 506 out1:
 507         tty_kref_put(tty);
 508         return ret;
 509 }
 510
 511 static void handle_minor_recv(struct capiminor *mp)
 512 {
 513         struct sk_buff *skb;
 514         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 515                 unsigned int len = skb->len;
 516                 mp->inbytes -= len;
 517                 if (handle_recv_skb(mp, skb) < 0) {
 518                         skb_queue_head(&mp->inqueue, skb);
 519                         mp->inbytes += len;
 520                         return;
 521                 }
 522         }
 523 }
 524
 525 static int handle_minor_send(struct capiminor *mp)
 526 {
 527         struct tty_struct *tty;
 528         struct sk_buff *skb;
 529         u16 len;
 530         int count = 0;
 531         u16 errcode;
 532         u16 datahandle;
 533
 534         tty = tty_port_tty_get(&mp->port);
 535         if (!tty)
 536                 return 0;
 537
 538         if (mp->ttyoutstop) {
 539 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 540                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 541 #endif
 542                 tty_kref_put(tty);
 543                 return 0;
 544         }
 545
 546         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 547                 datahandle = mp->datahandle;
 548                 len = (u16)skb->len;
 549                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 550                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 551                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 552                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 553                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 554                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 555                 capimsg_setu16(skb->data, 6, mp->msgid++);
 556                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 557                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 558                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 559                 capimsg_setu16(skb->data, 18, datahandle);
 560                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 561
 562                 if (capiminor_add_ack(mp, datahandle) < 0) {
 563                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 564                         skb_queue_head(&mp->outqueue, skb);
 565                         tty_kref_put(tty);
 566                         return count;
 567                 }
 568                 errcode = capi20_put_message(mp->ap, skb);
 569                 if (errcode == CAPI_NOERROR) {
 570                         mp->datahandle++;
 571                         count++;
 572                         mp->outbytes -= len;
 573 #ifdef _DEBUG_DATAFLOW
 574                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 575                                                         datahandle, len);
 576 #endif
 577                         continue;
 578                 }
 579                 capiminor_del_ack(mp, datahandle);
 580
 581                 if (errcode == CAPI_SENDQUEUEFULL) {
 582                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 583                         skb_queue_head(&mp->outqueue, skb);
 584                         break;
 585                 }
 586
 587                 /* ups, drop packet */
 588                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 589                 mp->outbytes -= len;
 590                 kfree_skb(skb);
 591         }
 592         tty_kref_put(tty);
 593         return count;
 594 }
 595
 596 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 597 /* -------- function called by lower level -------------------------- */
 598
 599 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 600 {
 601         struct capidev *cdev = ap->private;
 602 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 603         struct tty_struct *tty;
 604         struct capiminor *mp;
 605         u16 datahandle;
 606 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 607         struct capincci *np;
 608         unsigned long flags;
 609
 610         mutex_lock(&cdev->lock);
 611
 612         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 613                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 614                 if ((info & 0xff00) == 0)
 615                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 616         }
 617         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 618                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 619
 620         spin_lock_irqsave(&workaround_lock, flags);
 621         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 622                 skb_queue_tail(&cdev->recvqueue, skb);
 623                 wake_up_interruptible(&cdev->recvwait);
 624                 goto unlock_out;
 625         }
 626
 627         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 628         if (!np) {
 629                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 630                 skb_queue_tail(&cdev->recvqueue, skb);
 631                 wake_up_interruptible(&cdev->recvwait);
 632                 goto unlock_out;
 633         }
 634
 635 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 636         skb_queue_tail(&cdev->recvqueue, skb);
 637         wake_up_interruptible(&cdev->recvwait);
 638
 639 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 640
 641         mp = np->minorp;
 642         if (!mp) {
 643                 skb_queue_tail(&cdev->recvqueue, skb);
 644                 wake_up_interruptible(&cdev->recvwait);
 645                 goto unlock_out;
 646         }
 647         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 648                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 649 #ifdef _DEBUG_DATAFLOW
 650                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 651                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 652 #endif
 653                 skb_queue_tail(&mp->inqueue, skb);
 654                 mp->inbytes += skb->len;
 655                 handle_minor_recv(mp);
 656
 657         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 658
 659                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 660 #ifdef _DEBUG_DATAFLOW
 661                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 662                                 datahandle,
 663                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 664 #endif
 665                 kfree_skb(skb);
 666                 (void)capiminor_del_ack(mp, datahandle);
 667                 tty = tty_port_tty_get(&mp->port);
 668                 if (tty) {
 669                         tty_wakeup(tty);
 670                         tty_kref_put(tty);
 671                 }
 672                 (void)handle_minor_send(mp);
 673
 674         } else {
 675                 /* ups, let capi application handle it :-) */
 676                 skb_queue_tail(&cdev->recvqueue, skb);
 677                 wake_up_interruptible(&cdev->recvwait);
 678         }
 679 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 680
 681 unlock_out:
 682         spin_unlock_irqrestore(&workaround_lock, flags);
 683         mutex_unlock(&cdev->lock);
 684 }
 685
 686 /* -------- file_operations for capidev ----------------------------- */
 687
 688 static ssize_t
 689 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 690 {
 691         struct capidev *cdev = (struct capidev *)file->private_data;
 692         struct sk_buff *skb;
 693         size_t copied;
 694         int err;
 695
 696         if (!cdev->ap.applid)
 697                 return -ENODEV;
 698
 699         skb = skb_dequeue(&cdev->recvqueue);
 700         if (!skb) {
 701                 if (file->f_flags & O_NONBLOCK)
 702                         return -EAGAIN;
 703                 err = wait_event_interruptible(cdev->recvwait,
 704                                 (skb = skb_dequeue(&cdev->recvqueue)));
 705                 if (err)
 706                         return err;
 707         }
 708         if (skb->len > count) {
 709                 skb_queue_head(&cdev->recvqueue, skb);
 710                 return -EMSGSIZE;
 711         }
 712         if (copy_to_user(buf, skb->data, skb->len)) {
 713                 skb_queue_head(&cdev->recvqueue, skb);
 714                 return -EFAULT;
 715         }
 716         copied = skb->len;
 717
 718         kfree_skb(skb);
 719
 720         return copied;
 721 }
 722
 723 static ssize_t
 724 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 725 {
 726         struct capidev *cdev = (struct capidev *)file->private_data;
 727         struct sk_buff *skb;
 728         u16 mlen;
 729
 730         if (!cdev->ap.applid)
 731                 return -ENODEV;
 732
 733         skb = alloc_skb(count, GFP_USER);
 734         if (!skb)
 735                 return -ENOMEM;
 736
 737         if (copy_from_user(skb_put(skb, count), buf, count)) {
 738                 kfree_skb(skb);
 739                 return -EFAULT;
 740         }
 741         mlen = CAPIMSG_LEN(skb->data);
 742         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 743                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 744                         kfree_skb(skb);
 745                         return -EINVAL;
 746                 }
 747         } else {
 748                 if (mlen != count) {
 749                         kfree_skb(skb);
 750                         return -EINVAL;
 751                 }
 752         }
 753         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 754
 755         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 756                 mutex_lock(&cdev->lock);
 757                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 758                 mutex_unlock(&cdev->lock);
 759         }
 760
 761         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 762
 763         if (cdev->errcode) {
 764                 kfree_skb(skb);
 765                 return -EIO;
 766         }
 767         return count;
 768 }
 769
 770 static unsigned int
 771 capi_poll(struct file *file, poll_table * wait)
 772 {
 773         struct capidev *cdev = (struct capidev *)file->private_data;
 774         unsigned int mask = 0;
 775
 776         if (!cdev->ap.applid)
 777                 return POLLERR;
 778
 779         poll_wait(file, &(cdev->recvwait), wait);
 780         mask = POLLOUT | POLLWRNORM;
 781         if (!skb_queue_empty(&cdev->recvqueue))
 782                 mask |= POLLIN | POLLRDNORM;
 783         return mask;
 784 }
 785
 786 static int
 787 capi_ioctl(struct inode *inode, struct file *file,
 788            unsigned int cmd, unsigned long arg)
 789 {
 790         struct capidev *cdev = file->private_data;
 791         capi_ioctl_struct data;
 792         int retval = -EINVAL;
 793         void __user *argp = (void __user *)arg;
 794
 795         switch (cmd) {
 796         case CAPI_REGISTER:
 797                 mutex_lock(&cdev->lock);
 798
 799                 if (cdev->ap.applid) {
 800                         retval = -EEXIST;
 801                         goto register_out;
 802                 }
 803                 if (copy_from_user(&cdev->ap.rparam, argp,
 804                                    sizeof(struct capi_register_params))) {
 805                         retval = -EFAULT;
 806                         goto register_out;
 807                 }
 808                 cdev->ap.private = cdev;
 809                 cdev->ap.recv_message = capi_recv_message;
 810                 cdev->errcode = capi20_register(&cdev->ap);
 811                 retval = (int)cdev->ap.applid;
 812                 if (cdev->errcode) {
 813                         cdev->ap.applid = 0;
 814                         retval = -EIO;
 815                 }
 816
 817 register_out:
 818                 mutex_unlock(&cdev->lock);
 819                 return retval;
 820
 821         case CAPI_GET_VERSION:
 822                 {
 823                         if (copy_from_user(&data.contr, argp,
 824                                                 sizeof(data.contr)))
 825                                 return -EFAULT;
 826                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 827                         if (cdev->errcode)
 828                                 return -EIO;
 829                         if (copy_to_user(argp, &data.version,
 830                                          sizeof(data.version)))
 831                                 return -EFAULT;
 832                 }
 833                 return 0;
 834
 835         case CAPI_GET_SERIAL:
 836                 {
 837                         if (copy_from_user(&data.contr, argp,
 838                                            sizeof(data.contr)))
 839                                 return -EFAULT;
 840                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 841                         if (cdev->errcode)
 842                                 return -EIO;
 843                         if (copy_to_user(argp, data.serial,
 844                                          sizeof(data.serial)))
 845                                 return -EFAULT;
 846                 }
 847                 return 0;
 848         case CAPI_GET_PROFILE:
 849                 {
 850                         if (copy_from_user(&data.contr, argp,
 851                                            sizeof(data.contr)))
 852                                 return -EFAULT;
 853
 854                         if (data.contr == 0) {
 855                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 856                                 if (cdev->errcode)
 857                                         return -EIO;
 858
 859                                 retval = copy_to_user(argp,
 860                                       &data.profile.ncontroller,
 861                                        sizeof(data.profile.ncontroller));
 862
 863                         } else {
 864                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 865                                 if (cdev->errcode)
 866                                         return -EIO;
 867
 868                                 retval = copy_to_user(argp, &data.profile,
 869                                                    sizeof(data.profile));
 870                         }
 871                         if (retval)
 872                                 return -EFAULT;
 873                 }
 874                 return 0;
 875
 876         case CAPI_GET_MANUFACTURER:
 877                 {
 878                         if (copy_from_user(&data.contr, argp,
 879                                            sizeof(data.contr)))
 880                                 return -EFAULT;
 881                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 882                         if (cdev->errcode)
 883                                 return -EIO;
 884
 885                         if (copy_to_user(argp, data.manufacturer,
 886                                          sizeof(data.manufacturer)))
 887                                 return -EFAULT;
 888
 889                 }
 890                 return 0;
 891         case CAPI_GET_ERRCODE:
 892                 data.errcode = cdev->errcode;
 893                 cdev->errcode = CAPI_NOERROR;
 894                 if (arg) {
 895                         if (copy_to_user(argp, &data.errcode,
 896                                          sizeof(data.errcode)))
 897                                 return -EFAULT;
 898                 }
 899                 return data.errcode;
 900
 901         case CAPI_INSTALLED:
 902                 if (capi20_isinstalled() == CAPI_NOERROR)
 903                         return 0;
 904                 return -ENXIO;
 905
 906         case CAPI_MANUFACTURER_CMD:
 907                 {
 908                         struct capi_manufacturer_cmd mcmd;
 909                         if (!capable(CAP_SYS_ADMIN))
 910                                 return -EPERM;
 911                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 912                                 return -EFAULT;
 913                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 914                 }
 915                 return 0;
 916
 917         case CAPI_SET_FLAGS:
 918         case CAPI_CLR_FLAGS: {
 919                 unsigned userflags;
 920
 921                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 922                         return -EFAULT;
 923
 924                 mutex_lock(&cdev->lock);
 925                 if (cmd == CAPI_SET_FLAGS)
 926                         cdev->userflags |= userflags;
 927                 else
 928                         cdev->userflags &= ~userflags;
 929                 mutex_unlock(&cdev->lock);
 930                 return 0;
 931         }
 932         case CAPI_GET_FLAGS:
 933                 if (copy_to_user(argp, &cdev->userflags,
 934                                  sizeof(cdev->userflags)))
 935                         return -EFAULT;
 936                 return 0;
 937
 938         case CAPI_NCCI_OPENCOUNT: {
 939                 struct capincci *nccip;
 940                 unsigned ncci;
 941                 int count = 0;
 942
 943                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 944                         return -EFAULT;
 945
 946                 mutex_lock(&cdev->lock);
 947                 nccip = capincci_find(cdev, (u32)ncci);
 948                 if (nccip)
 949                         count = capincci_minor_opencount(nccip);
 950                 mutex_unlock(&cdev->lock);
 951                 return count;
 952         }
 953
 954 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 955         case CAPI_NCCI_GETUNIT: {
 956                 struct capincci *nccip;
 957                 struct capiminor *mp;
 958                 unsigned ncci;
 959                 int unit = -ESRCH;
 960
 961                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 962                         return -EFAULT;
 963
 964                 mutex_lock(&cdev->lock);
 965                 nccip = capincci_find(cdev, (u32)ncci);
 966                 if (nccip) {
 967                         mp = nccip->minorp;
 968                         if (mp)
 969                                 unit = mp->minor;
 970                 }
 971                 mutex_unlock(&cdev->lock);
 972                 return unit;
 973         }
 974 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 975
 976         default:
 977                 return -EINVAL;
 978         }
 979 }
 980
 981 static int capi_open(struct inode *inode, struct file *file)
 982 {
 983         struct capidev *cdev;
 984
 985         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 986         if (!cdev)
 987                 return -ENOMEM;
 988
 989         mutex_init(&cdev->lock);
 990         skb_queue_head_init(&cdev->recvqueue);
 991         init_waitqueue_head(&cdev->recvwait);
 992         INIT_LIST_HEAD(&cdev->nccis);
 993         file->private_data = cdev;
 994
 995         mutex_lock(&capidev_list_lock);
 996         list_add_tail(&cdev->list, &capidev_list);
 997         mutex_unlock(&capidev_list_lock);
 998
 999         return nonseekable_open(inode, file);
1000 }
1001
1002 static int capi_release(struct inode *inode, struct file *file)
1003 {
1004         struct capidev *cdev = file->private_data;
1005
1006         mutex_lock(&capidev_list_lock);
1007         list_del(&cdev->list);
1008         mutex_unlock(&capidev_list_lock);
1009
1010         if (cdev->ap.applid)
1011                 capi20_release(&cdev->ap);
1012         skb_queue_purge(&cdev->recvqueue);
1013         capincci_free(cdev, 0xffffffff);
1014
1015         kfree(cdev);
1016         return 0;
1017 }
1018
1019 static const struct file_operations capi_fops =
1020 {
1021         .owner          = THIS_MODULE,
1022         .llseek         = no_llseek,
1023         .read           = capi_read,
1024         .write          = capi_write,
1025         .poll           = capi_poll,
1026         .ioctl          = capi_ioctl,
1027         .open           = capi_open,
1028         .release        = capi_release,
1029 };
1030
1031 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1032 /* -------- tty_operations for capincci ----------------------------- */
1033
1034 static int
1035 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1036 {
1037         int idx = tty->index;
1038         struct capiminor *mp = capiminor_get(idx);
1039         int ret = tty_init_termios(tty);
1040
1041         if (ret == 0) {
1042                 tty_driver_kref_get(driver);
1043                 tty->count++;
1044                 tty->driver_data = mp;
1045                 driver->ttys[idx] = tty;
1046         } else
1047                 capiminor_put(mp);
1048         return ret;
1049 }
1050
1051 static void capinc_tty_cleanup(struct tty_struct *tty)
1052 {
1053         struct capiminor *mp = tty->driver_data;
1054         tty->driver_data = NULL;
1055         capiminor_put(mp);
1056 }
1057
1058 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1059 {
1060         struct capiminor *mp = tty->driver_data;
1061         unsigned long flags;
1062         int err;
1063
1064         err = tty_port_open(&mp->port, tty, filp);
1065         if (err)
1066                 return err;
1067
1068         spin_lock_irqsave(&workaround_lock, flags);
1069         atomic_inc(&mp->ttyopencount);
1070 #ifdef _DEBUG_REFCOUNT
1071         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1072 #endif
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                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1083 #ifdef _DEBUG_REFCOUNT
1084                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1085 #endif
1086                 }
1087 #ifdef _DEBUG_REFCOUNT
1088                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1089 #endif
1090
1091 #ifdef _DEBUG_REFCOUNT
1092         printk(KERN_DEBUG "capinc_tty_close\n");
1093 #endif
1094         tty_port_close(&mp->port, tty, filp);
1095 }
1096
1097 static int capinc_tty_write(struct tty_struct * tty,
1098                             const unsigned char *buf, int count)
1099 {
1100         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1101         struct sk_buff *skb;
1102         unsigned long flags;
1103
1104 #ifdef _DEBUG_TTYFUNCS
1105         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1106 #endif
1107
1108         if (!mp || !mp->nccip) {
1109 #ifdef _DEBUG_TTYFUNCS
1110                 printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
1111 #endif
1112                 return 0;
1113         }
1114
1115         spin_lock_irqsave(&workaround_lock, flags);
1116         skb = mp->ttyskb;
1117         if (skb) {
1118                 mp->ttyskb = NULL;
1119                 skb_queue_tail(&mp->outqueue, skb);
1120                 mp->outbytes += skb->len;
1121         }
1122
1123         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1124         if (!skb) {
1125                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1126                 spin_unlock_irqrestore(&workaround_lock, flags);
1127                 return -ENOMEM;
1128         }
1129
1130         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1131         memcpy(skb_put(skb, count), buf, count);
1132
1133         skb_queue_tail(&mp->outqueue, skb);
1134         mp->outbytes += skb->len;
1135         (void)handle_minor_send(mp);
1136         (void)handle_minor_recv(mp);
1137         spin_unlock_irqrestore(&workaround_lock, flags);
1138         return count;
1139 }
1140
1141 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1142 {
1143         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1144         struct sk_buff *skb;
1145         unsigned long flags;
1146         int ret = 1;
1147
1148 #ifdef _DEBUG_TTYFUNCS
1149         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1150 #endif
1151
1152         if (!mp || !mp->nccip) {
1153 #ifdef _DEBUG_TTYFUNCS
1154                 printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
1155 #endif
1156                 return 0;
1157         }
1158
1159         spin_lock_irqsave(&workaround_lock, flags);
1160         skb = mp->ttyskb;
1161         if (skb) {
1162                 if (skb_tailroom(skb) > 0) {
1163                         *(skb_put(skb, 1)) = ch;
1164                         spin_unlock_irqrestore(&workaround_lock, flags);
1165                         return 1;
1166                 }
1167                 mp->ttyskb = NULL;
1168                 skb_queue_tail(&mp->outqueue, skb);
1169                 mp->outbytes += skb->len;
1170                 (void)handle_minor_send(mp);
1171         }
1172         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1173         if (skb) {
1174                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1175                 *(skb_put(skb, 1)) = ch;
1176                 mp->ttyskb = skb;
1177         } else {
1178                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1179                 ret = 0;
1180         }
1181         spin_unlock_irqrestore(&workaround_lock, flags);
1182         return ret;
1183 }
1184
1185 static void capinc_tty_flush_chars(struct tty_struct *tty)
1186 {
1187         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1188         struct sk_buff *skb;
1189         unsigned long flags;
1190
1191 #ifdef _DEBUG_TTYFUNCS
1192         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1193 #endif
1194
1195         if (!mp || !mp->nccip) {
1196 #ifdef _DEBUG_TTYFUNCS
1197                 printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
1198 #endif
1199                 return;
1200         }
1201
1202         spin_lock_irqsave(&workaround_lock, flags);
1203         skb = mp->ttyskb;
1204         if (skb) {
1205                 mp->ttyskb = NULL;
1206                 skb_queue_tail(&mp->outqueue, skb);
1207                 mp->outbytes += skb->len;
1208                 (void)handle_minor_send(mp);
1209         }
1210         (void)handle_minor_recv(mp);
1211         spin_unlock_irqrestore(&workaround_lock, flags);
1212 }
1213
1214 static int capinc_tty_write_room(struct tty_struct *tty)
1215 {
1216         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1217         int room;
1218         if (!mp || !mp->nccip) {
1219 #ifdef _DEBUG_TTYFUNCS
1220                 printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
1221 #endif
1222                 return 0;
1223         }
1224         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1225         room *= CAPI_MAX_BLKSIZE;
1226 #ifdef _DEBUG_TTYFUNCS
1227         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1228 #endif
1229         return room;
1230 }
1231
1232 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1233 {
1234         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1235         if (!mp || !mp->nccip) {
1236 #ifdef _DEBUG_TTYFUNCS
1237                 printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
1238 #endif
1239                 return 0;
1240         }
1241 #ifdef _DEBUG_TTYFUNCS
1242         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1243                         mp->outbytes, mp->nack,
1244                         skb_queue_len(&mp->outqueue),
1245                         skb_queue_len(&mp->inqueue));
1246 #endif
1247         return mp->outbytes;
1248 }
1249
1250 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1251                     unsigned int cmd, unsigned long arg)
1252 {
1253         int error = 0;
1254         switch (cmd) {
1255         default:
1256                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1257                 break;
1258         }
1259         return error;
1260 }
1261
1262 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1263 {
1264 #ifdef _DEBUG_TTYFUNCS
1265         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1266 #endif
1267 }
1268
1269 static void capinc_tty_throttle(struct tty_struct * tty)
1270 {
1271         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1272 #ifdef _DEBUG_TTYFUNCS
1273         printk(KERN_DEBUG "capinc_tty_throttle\n");
1274 #endif
1275         if (mp)
1276                 mp->ttyinstop = 1;
1277 }
1278
1279 static void capinc_tty_unthrottle(struct tty_struct * tty)
1280 {
1281         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1282         unsigned long flags;
1283 #ifdef _DEBUG_TTYFUNCS
1284         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1285 #endif
1286         if (mp) {
1287                 spin_lock_irqsave(&workaround_lock, flags);
1288                 mp->ttyinstop = 0;
1289                 handle_minor_recv(mp);
1290                 spin_unlock_irqrestore(&workaround_lock, flags);
1291         }
1292 }
1293
1294 static void capinc_tty_stop(struct tty_struct *tty)
1295 {
1296         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1297 #ifdef _DEBUG_TTYFUNCS
1298         printk(KERN_DEBUG "capinc_tty_stop\n");
1299 #endif
1300         if (mp) {
1301                 mp->ttyoutstop = 1;
1302         }
1303 }
1304
1305 static void capinc_tty_start(struct tty_struct *tty)
1306 {
1307         struct capiminor *mp = (struct capiminor *)tty->driver_data;
1308         unsigned long flags;
1309 #ifdef _DEBUG_TTYFUNCS
1310         printk(KERN_DEBUG "capinc_tty_start\n");
1311 #endif
1312         if (mp) {
1313                 spin_lock_irqsave(&workaround_lock, flags);
1314                 mp->ttyoutstop = 0;
1315                 (void)handle_minor_send(mp);
1316                 spin_unlock_irqrestore(&workaround_lock, flags);
1317         }
1318 }
1319
1320 static void capinc_tty_hangup(struct tty_struct *tty)
1321 {
1322         struct capiminor *mp = tty->driver_data;
1323
1324 #ifdef _DEBUG_TTYFUNCS
1325         printk(KERN_DEBUG "capinc_tty_hangup\n");
1326 #endif
1327         tty_port_hangup(&mp->port);
1328 }
1329
1330 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1331 {
1332 #ifdef _DEBUG_TTYFUNCS
1333         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1334 #endif
1335         return 0;
1336 }
1337
1338 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1339 {
1340 #ifdef _DEBUG_TTYFUNCS
1341         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1342 #endif
1343 }
1344
1345 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1346 {
1347 #ifdef _DEBUG_TTYFUNCS
1348         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1349 #endif
1350 }
1351
1352 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1353 {
1354 #ifdef _DEBUG_TTYFUNCS
1355         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1356 #endif
1357 }
1358
1359 static const struct tty_operations capinc_ops = {
1360         .open = capinc_tty_open,
1361         .close = capinc_tty_close,
1362         .write = capinc_tty_write,
1363         .put_char = capinc_tty_put_char,
1364         .flush_chars = capinc_tty_flush_chars,
1365         .write_room = capinc_tty_write_room,
1366         .chars_in_buffer = capinc_tty_chars_in_buffer,
1367         .ioctl = capinc_tty_ioctl,
1368         .set_termios = capinc_tty_set_termios,
1369         .throttle = capinc_tty_throttle,
1370         .unthrottle = capinc_tty_unthrottle,
1371         .stop = capinc_tty_stop,
1372         .start = capinc_tty_start,
1373         .hangup = capinc_tty_hangup,
1374         .break_ctl = capinc_tty_break_ctl,
1375         .flush_buffer = capinc_tty_flush_buffer,
1376         .set_ldisc = capinc_tty_set_ldisc,
1377         .send_xchar = capinc_tty_send_xchar,
1378         .install = capinc_tty_install,
1379         .cleanup = capinc_tty_cleanup,
1380 };
1381
1382 static int __init capinc_tty_init(void)
1383 {
1384         struct tty_driver *drv;
1385         int err;
1386
1387         if (capi_ttyminors > CAPINC_MAX_PORTS)
1388                 capi_ttyminors = CAPINC_MAX_PORTS;
1389         if (capi_ttyminors <= 0)
1390                 capi_ttyminors = CAPINC_NR_PORTS;
1391
1392         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1393                              GFP_KERNEL);
1394         if (!capiminors)
1395                 return -ENOMEM;
1396
1397         drv = alloc_tty_driver(capi_ttyminors);
1398         if (!drv) {
1399                 kfree(capiminors);
1400                 return -ENOMEM;
1401         }
1402         drv->owner = THIS_MODULE;
1403         drv->driver_name = "capi_nc";
1404         drv->name = "capi";
1405         drv->major = 0;
1406         drv->minor_start = 0;
1407         drv->type = TTY_DRIVER_TYPE_SERIAL;
1408         drv->subtype = SERIAL_TYPE_NORMAL;
1409         drv->init_termios = tty_std_termios;
1410         drv->init_termios.c_iflag = ICRNL;
1411         drv->init_termios.c_oflag = OPOST | ONLCR;
1412         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1413         drv->init_termios.c_lflag = 0;
1414         drv->flags =
1415                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1416                 TTY_DRIVER_DYNAMIC_DEV;
1417         tty_set_operations(drv, &capinc_ops);
1418
1419         err = tty_register_driver(drv);
1420         if (err) {
1421                 put_tty_driver(drv);
1422                 kfree(capiminors);
1423                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1424                 return err;
1425         }
1426         capinc_tty_driver = drv;
1427         return 0;
1428 }
1429
1430 static void __exit capinc_tty_exit(void)
1431 {
1432         tty_unregister_driver(capinc_tty_driver);
1433         put_tty_driver(capinc_tty_driver);
1434         kfree(capiminors);
1435 }
1436
1437 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1438
1439 static inline int capinc_tty_init(void)
1440 {
1441         return 0;
1442 }
1443
1444 static inline void capinc_tty_exit(void) { }
1445
1446 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1447
1448 /* -------- /proc functions ----------------------------------------- */
1449
1450 /*
1451  * /proc/capi/capi20:
1452  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1453  */
1454 static int capi20_proc_show(struct seq_file *m, void *v)
1455 {
1456         struct capidev *cdev;
1457         struct list_head *l;
1458
1459         mutex_lock(&capidev_list_lock);
1460         list_for_each(l, &capidev_list) {
1461                 cdev = list_entry(l, struct capidev, list);
1462                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1463                         cdev->ap.applid,
1464                         cdev->ap.nrecvctlpkt,
1465                         cdev->ap.nrecvdatapkt,
1466                         cdev->ap.nsentctlpkt,
1467                         cdev->ap.nsentdatapkt);
1468         }
1469         mutex_unlock(&capidev_list_lock);
1470         return 0;
1471 }
1472
1473 static int capi20_proc_open(struct inode *inode, struct file *file)
1474 {
1475         return single_open(file, capi20_proc_show, NULL);
1476 }
1477
1478 static const struct file_operations capi20_proc_fops = {
1479         .owner          = THIS_MODULE,
1480         .open           = capi20_proc_open,
1481         .read           = seq_read,
1482         .llseek         = seq_lseek,
1483         .release        = single_release,
1484 };
1485
1486 /*
1487  * /proc/capi/capi20ncci:
1488  *  applid ncci
1489  */
1490 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1491 {
1492         struct capidev *cdev;
1493         struct capincci *np;
1494
1495         mutex_lock(&capidev_list_lock);
1496         list_for_each_entry(cdev, &capidev_list, list) {
1497                 mutex_lock(&cdev->lock);
1498                 list_for_each_entry(np, &cdev->nccis, list)
1499                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1500                 mutex_unlock(&cdev->lock);
1501         }
1502         mutex_unlock(&capidev_list_lock);
1503         return 0;
1504 }
1505
1506 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1507 {
1508         return single_open(file, capi20ncci_proc_show, NULL);
1509 }
1510
1511 static const struct file_operations capi20ncci_proc_fops = {
1512         .owner          = THIS_MODULE,
1513         .open           = capi20ncci_proc_open,
1514         .read           = seq_read,
1515         .llseek         = seq_lseek,
1516         .release        = single_release,
1517 };
1518
1519 static void __init proc_init(void)
1520 {
1521         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1522         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1523 }
1524
1525 static void __exit proc_exit(void)
1526 {
1527         remove_proc_entry("capi/capi20", NULL);
1528         remove_proc_entry("capi/capi20ncci", NULL);
1529 }
1530
1531 /* -------- init function and module interface ---------------------- */
1532
1533
1534 static int __init capi_init(void)
1535 {
1536         const char *compileinfo;
1537         int major_ret;
1538
1539         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1540         if (major_ret < 0) {
1541                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1542                 return major_ret;
1543         }
1544         capi_class = class_create(THIS_MODULE, "capi");
1545         if (IS_ERR(capi_class)) {
1546                 unregister_chrdev(capi_major, "capi20");
1547                 return PTR_ERR(capi_class);
1548         }
1549
1550         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1551
1552         if (capinc_tty_init() < 0) {
1553                 device_destroy(capi_class, MKDEV(capi_major, 0));
1554                 class_destroy(capi_class);
1555                 unregister_chrdev(capi_major, "capi20");
1556                 return -ENOMEM;
1557         }
1558
1559         proc_init();
1560
1561 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1562         compileinfo = " (middleware+capifs)";
1563 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1564         compileinfo = " (no capifs)";
1565 #else
1566         compileinfo = " (no middleware)";
1567 #endif
1568         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1569                capi_major, compileinfo);
1570
1571         return 0;
1572 }
1573
1574 static void __exit capi_exit(void)
1575 {
1576         proc_exit();
1577
1578         device_destroy(capi_class, MKDEV(capi_major, 0));
1579         class_destroy(capi_class);
1580         unregister_chrdev(capi_major, "capi20");
1581
1582         capinc_tty_exit();
1583 }
1584
1585 module_init(capi_init);
1586 module_exit(capi_exit);