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/compiler.h>
  13 #include <linux/module.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/major.h>
  17 #include <linux/sched.h>
  18 #include <linux/slab.h>
  19 #include <linux/fcntl.h>
  20 #include <linux/fs.h>
  21 #include <linux/signal.h>
  22 #include <linux/mutex.h>
  23 #include <linux/mm.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/ppp-ioctl.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 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  43 MODULE_AUTHOR("Carsten Paeth");
  44 MODULE_LICENSE("GPL");
  45
  46 /* -------- driver information -------------------------------------- */
  47
  48 static DEFINE_MUTEX(capi_mutex);
  49 static struct class *capi_class;
  50 static int capi_major = 68;             /* allocated */
  51
  52 module_param_named(major, capi_major, uint, 0);
  53
  54 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  55 #define CAPINC_NR_PORTS         32
  56 #define CAPINC_MAX_PORTS        256
  57
  58 static int capi_ttyminors = CAPINC_NR_PORTS;
  59
  60 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  61 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  62
  63 /* -------- defines ------------------------------------------------- */
  64
  65 #define CAPINC_MAX_RECVQUEUE    10
  66 #define CAPINC_MAX_SENDQUEUE    10
  67 #define CAPI_MAX_BLKSIZE        2048
  68
  69 /* -------- data structures ----------------------------------------- */
  70
  71 struct capidev;
  72 struct capincci;
  73 struct capiminor;
  74
  75 struct ackqueue_entry {
  76         struct list_head        list;
  77         u16                     datahandle;
  78 };
  79
  80 struct capiminor {
  81         unsigned int      minor;
  82
  83         struct capi20_appl      *ap;
  84         u32                     ncci;
  85         atomic_t                datahandle;
  86         atomic_t                msgid;
  87
  88         struct tty_port port;
  89         int                ttyinstop;
  90         int                ttyoutstop;
  91
  92         struct sk_buff_head     inqueue;
  93
  94         struct sk_buff_head     outqueue;
  95         int                     outbytes;
  96         struct sk_buff          *outskb;
  97         spinlock_t              outlock;
  98
  99         /* transmit path */
 100         struct list_head ackqueue;
 101         int nack;
 102         spinlock_t ackqlock;
 103 };
 104
 105 struct capincci {
 106         struct list_head list;
 107         u32              ncci;
 108         struct capidev  *cdev;
 109 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 110         struct capiminor *minorp;
 111 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 112 };
 113
 114 struct capidev {
 115         struct list_head list;
 116         struct capi20_appl ap;
 117         u16             errcode;
 118         unsigned        userflags;
 119
 120         struct sk_buff_head recvqueue;
 121         wait_queue_head_t recvwait;
 122
 123         struct list_head nccis;
 124
 125         struct mutex lock;
 126 };
 127
 128 /* -------- global variables ---------------------------------------- */
 129
 130 static DEFINE_MUTEX(capidev_list_lock);
 131 static LIST_HEAD(capidev_list);
 132
 133 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 134
 135 static DEFINE_SPINLOCK(capiminors_lock);
 136 static struct capiminor **capiminors;
 137
 138 static struct tty_driver *capinc_tty_driver;
 139
 140 /* -------- datahandles --------------------------------------------- */
 141
 142 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 143 {
 144         struct ackqueue_entry *n;
 145
 146         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 147         if (unlikely(!n)) {
 148                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 149                 return -1;
 150         }
 151         n->datahandle = datahandle;
 152         INIT_LIST_HEAD(&n->list);
 153         spin_lock_bh(&mp->ackqlock);
 154         list_add_tail(&n->list, &mp->ackqueue);
 155         mp->nack++;
 156         spin_unlock_bh(&mp->ackqlock);
 157         return 0;
 158 }
 159
 160 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 161 {
 162         struct ackqueue_entry *p, *tmp;
 163
 164         spin_lock_bh(&mp->ackqlock);
 165         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 166                 if (p->datahandle == datahandle) {
 167                         list_del(&p->list);
 168                         mp->nack--;
 169                         spin_unlock_bh(&mp->ackqlock);
 170                         kfree(p);
 171                         return 0;
 172                 }
 173         }
 174         spin_unlock_bh(&mp->ackqlock);
 175         return -1;
 176 }
 177
 178 static void capiminor_del_all_ack(struct capiminor *mp)
 179 {
 180         struct ackqueue_entry *p, *tmp;
 181
 182         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 183                 list_del(&p->list);
 184                 kfree(p);
 185                 mp->nack--;
 186         }
 187 }
 188
 189
 190 /* -------- struct capiminor ---------------------------------------- */
 191
 192 static void capiminor_destroy(struct tty_port *port)
 193 {
 194         struct capiminor *mp = container_of(port, struct capiminor, port);
 195
 196         kfree_skb(mp->outskb);
 197         skb_queue_purge(&mp->inqueue);
 198         skb_queue_purge(&mp->outqueue);
 199         capiminor_del_all_ack(mp);
 200         kfree(mp);
 201 }
 202
 203 static const struct tty_port_operations capiminor_port_ops = {
 204         .destruct = capiminor_destroy,
 205 };
 206
 207 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 208 {
 209         struct capiminor *mp;
 210         struct device *dev;
 211         unsigned int minor;
 212
 213         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 214         if (!mp) {
 215                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 216                 return NULL;
 217         }
 218
 219         mp->ap = ap;
 220         mp->ncci = ncci;
 221         INIT_LIST_HEAD(&mp->ackqueue);
 222         spin_lock_init(&mp->ackqlock);
 223
 224         skb_queue_head_init(&mp->inqueue);
 225         skb_queue_head_init(&mp->outqueue);
 226         spin_lock_init(&mp->outlock);
 227
 228         tty_port_init(&mp->port);
 229         mp->port.ops = &capiminor_port_ops;
 230
 231         /* Allocate the least unused minor number. */
 232         spin_lock(&capiminors_lock);
 233         for (minor = 0; minor < capi_ttyminors; minor++)
 234                 if (!capiminors[minor]) {
 235                         capiminors[minor] = mp;
 236                         break;
 237                 }
 238         spin_unlock(&capiminors_lock);
 239
 240         if (minor == capi_ttyminors) {
 241                 printk(KERN_NOTICE "capi: out of minors\n");
 242                 goto err_out1;
 243         }
 244
 245         mp->minor = minor;
 246
 247         dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
 248                         NULL);
 249         if (IS_ERR(dev))
 250                 goto err_out2;
 251
 252         return mp;
 253
 254 err_out2:
 255         spin_lock(&capiminors_lock);
 256         capiminors[minor] = NULL;
 257         spin_unlock(&capiminors_lock);
 258
 259 err_out1:
 260         tty_port_put(&mp->port);
 261         return NULL;
 262 }
 263
 264 static struct capiminor *capiminor_get(unsigned int minor)
 265 {
 266         struct capiminor *mp;
 267
 268         spin_lock(&capiminors_lock);
 269         mp = capiminors[minor];
 270         if (mp)
 271                 tty_port_get(&mp->port);
 272         spin_unlock(&capiminors_lock);
 273
 274         return mp;
 275 }
 276
 277 static inline void capiminor_put(struct capiminor *mp)
 278 {
 279         tty_port_put(&mp->port);
 280 }
 281
 282 static void capiminor_free(struct capiminor *mp)
 283 {
 284         tty_unregister_device(capinc_tty_driver, mp->minor);
 285
 286         spin_lock(&capiminors_lock);
 287         capiminors[mp->minor] = NULL;
 288         spin_unlock(&capiminors_lock);
 289
 290         capiminor_put(mp);
 291 }
 292
 293 /* -------- struct capincci ----------------------------------------- */
 294
 295 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 296 {
 297         if (cdev->userflags & CAPIFLAG_HIGHJACKING)
 298                 np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 299 }
 300
 301 static void capincci_free_minor(struct capincci *np)
 302 {
 303         struct capiminor *mp = np->minorp;
 304         struct tty_struct *tty;
 305
 306         if (mp) {
 307                 tty = tty_port_tty_get(&mp->port);
 308                 if (tty) {
 309                         tty_vhangup(tty);
 310                         tty_kref_put(tty);
 311                 }
 312
 313                 capiminor_free(mp);
 314         }
 315 }
 316
 317 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 318 {
 319         struct capiminor *mp = np->minorp;
 320         unsigned int count = 0;
 321         struct tty_struct *tty;
 322
 323         if (mp) {
 324                 tty = tty_port_tty_get(&mp->port);
 325                 if (tty) {
 326                         count = tty->count;
 327                         tty_kref_put(tty);
 328                 }
 329         }
 330         return count;
 331 }
 332
 333 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 334
 335 static inline void
 336 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 337 static inline void capincci_free_minor(struct capincci *np) { }
 338
 339 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 340
 341 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 342 {
 343         struct capincci *np;
 344
 345         np = kzalloc(sizeof(*np), GFP_KERNEL);
 346         if (!np)
 347                 return NULL;
 348         np->ncci = ncci;
 349         np->cdev = cdev;
 350
 351         capincci_alloc_minor(cdev, np);
 352
 353         list_add_tail(&np->list, &cdev->nccis);
 354
 355         return np;
 356 }
 357
 358 static void capincci_free(struct capidev *cdev, u32 ncci)
 359 {
 360         struct capincci *np, *tmp;
 361
 362         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 363                 if (ncci == 0xffffffff || np->ncci == ncci) {
 364                         capincci_free_minor(np);
 365                         list_del(&np->list);
 366                         kfree(np);
 367                 }
 368 }
 369
 370 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 371 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 372 {
 373         struct capincci *np;
 374
 375         list_for_each_entry(np, &cdev->nccis, list)
 376                 if (np->ncci == ncci)
 377                         return np;
 378         return NULL;
 379 }
 380
 381 /* -------- handle data queue --------------------------------------- */
 382
 383 static struct sk_buff *
 384 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 385 {
 386         struct sk_buff *nskb;
 387         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
 388         if (nskb) {
 389                 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 390                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 391                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 392                 capimsg_setu16(s, 2, mp->ap->applid);
 393                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 394                 capimsg_setu8 (s, 5, CAPI_RESP);
 395                 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
 396                 capimsg_setu32(s, 8, mp->ncci);
 397                 capimsg_setu16(s, 12, datahandle);
 398         }
 399         return nskb;
 400 }
 401
 402 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 403 {
 404         unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
 405         struct tty_struct *tty;
 406         struct sk_buff *nskb;
 407         u16 errcode, datahandle;
 408         struct tty_ldisc *ld;
 409         int ret = -1;
 410
 411         tty = tty_port_tty_get(&mp->port);
 412         if (!tty) {
 413                 pr_debug("capi: currently no receiver\n");
 414                 return -1;
 415         }
 416
 417         ld = tty_ldisc_ref(tty);
 418         if (!ld) {
 419                 /* fatal error, do not requeue */
 420                 ret = 0;
 421                 kfree_skb(skb);
 422                 goto deref_tty;
 423         }
 424
 425         if (ld->ops->receive_buf == NULL) {
 426                 pr_debug("capi: ldisc has no receive_buf function\n");
 427                 /* fatal error, do not requeue */
 428                 goto free_skb;
 429         }
 430         if (mp->ttyinstop) {
 431                 pr_debug("capi: recv tty throttled\n");
 432                 goto deref_ldisc;
 433         }
 434
 435         if (tty->receive_room < datalen) {
 436                 pr_debug("capi: no room in tty\n");
 437                 goto deref_ldisc;
 438         }
 439
 440         nskb = gen_data_b3_resp_for(mp, skb);
 441         if (!nskb) {
 442                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 443                 goto deref_ldisc;
 444         }
 445
 446         datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 447
 448         errcode = capi20_put_message(mp->ap, nskb);
 449
 450         if (errcode == CAPI_NOERROR) {
 451                 skb_pull(skb, CAPIMSG_LEN(skb->data));
 452                 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
 453                          datahandle, skb->len);
 454                 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 455         } else {
 456                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 457                        errcode);
 458                 kfree_skb(nskb);
 459
 460                 if (errcode == CAPI_SENDQUEUEFULL)
 461                         goto deref_ldisc;
 462         }
 463
 464 free_skb:
 465         ret = 0;
 466         kfree_skb(skb);
 467
 468 deref_ldisc:
 469         tty_ldisc_deref(ld);
 470
 471 deref_tty:
 472         tty_kref_put(tty);
 473         return ret;
 474 }
 475
 476 static void handle_minor_recv(struct capiminor *mp)
 477 {
 478         struct sk_buff *skb;
 479
 480         while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
 481                 if (handle_recv_skb(mp, skb) < 0) {
 482                         skb_queue_head(&mp->inqueue, skb);
 483                         return;
 484                 }
 485 }
 486
 487 static void handle_minor_send(struct capiminor *mp)
 488 {
 489         struct tty_struct *tty;
 490         struct sk_buff *skb;
 491         u16 len;
 492         u16 errcode;
 493         u16 datahandle;
 494
 495         tty = tty_port_tty_get(&mp->port);
 496         if (!tty)
 497                 return;
 498
 499         if (mp->ttyoutstop) {
 500                 pr_debug("capi: send: tty stopped\n");
 501                 tty_kref_put(tty);
 502                 return;
 503         }
 504
 505         while (1) {
 506                 spin_lock_bh(&mp->outlock);
 507                 skb = __skb_dequeue(&mp->outqueue);
 508                 if (!skb) {
 509                         spin_unlock_bh(&mp->outlock);
 510                         break;
 511                 }
 512                 len = (u16)skb->len;
 513                 mp->outbytes -= len;
 514                 spin_unlock_bh(&mp->outlock);
 515
 516                 datahandle = atomic_inc_return(&mp->datahandle);
 517                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 518                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 519                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 520                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 521                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 522                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 523                 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
 524                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 525                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 526                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 527                 capimsg_setu16(skb->data, 18, datahandle);
 528                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 529
 530                 if (capiminor_add_ack(mp, datahandle) < 0) {
 531                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 532
 533                         spin_lock_bh(&mp->outlock);
 534                         __skb_queue_head(&mp->outqueue, skb);
 535                         mp->outbytes += len;
 536                         spin_unlock_bh(&mp->outlock);
 537
 538                         break;
 539                 }
 540                 errcode = capi20_put_message(mp->ap, skb);
 541                 if (errcode == CAPI_NOERROR) {
 542                         pr_debug("capi: DATA_B3_REQ %u len=%u\n",
 543                                  datahandle, len);
 544                         continue;
 545                 }
 546                 capiminor_del_ack(mp, datahandle);
 547
 548                 if (errcode == CAPI_SENDQUEUEFULL) {
 549                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 550
 551                         spin_lock_bh(&mp->outlock);
 552                         __skb_queue_head(&mp->outqueue, skb);
 553                         mp->outbytes += len;
 554                         spin_unlock_bh(&mp->outlock);
 555
 556                         break;
 557                 }
 558
 559                 /* ups, drop packet */
 560                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 561                 kfree_skb(skb);
 562         }
 563         tty_kref_put(tty);
 564 }
 565
 566 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 567 /* -------- function called by lower level -------------------------- */
 568
 569 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 570 {
 571         struct capidev *cdev = ap->private;
 572 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 573         struct capiminor *mp;
 574         u16 datahandle;
 575         struct capincci *np;
 576 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 577
 578         mutex_lock(&cdev->lock);
 579
 580         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 581                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 582                 if ((info & 0xff00) == 0)
 583                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 584         }
 585         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 586                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 587
 588         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 589                 skb_queue_tail(&cdev->recvqueue, skb);
 590                 wake_up_interruptible(&cdev->recvwait);
 591                 goto unlock_out;
 592         }
 593
 594 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 595         skb_queue_tail(&cdev->recvqueue, skb);
 596         wake_up_interruptible(&cdev->recvwait);
 597
 598 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 599
 600         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 601         if (!np) {
 602                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 603                 skb_queue_tail(&cdev->recvqueue, skb);
 604                 wake_up_interruptible(&cdev->recvwait);
 605                 goto unlock_out;
 606         }
 607
 608         mp = np->minorp;
 609         if (!mp) {
 610                 skb_queue_tail(&cdev->recvqueue, skb);
 611                 wake_up_interruptible(&cdev->recvwait);
 612                 goto unlock_out;
 613         }
 614         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 615                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 616                 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
 617                          datahandle, skb->len-CAPIMSG_LEN(skb->data));
 618                 skb_queue_tail(&mp->inqueue, skb);
 619
 620                 handle_minor_recv(mp);
 621
 622         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 623
 624                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 625                 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
 626                          datahandle,
 627                          CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
 628                 kfree_skb(skb);
 629                 capiminor_del_ack(mp, datahandle);
 630                 tty_port_tty_wakeup(&mp->port);
 631                 handle_minor_send(mp);
 632
 633         } else {
 634                 /* ups, let capi application handle it :-) */
 635                 skb_queue_tail(&cdev->recvqueue, skb);
 636                 wake_up_interruptible(&cdev->recvwait);
 637         }
 638 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 639
 640 unlock_out:
 641         mutex_unlock(&cdev->lock);
 642 }
 643
 644 /* -------- file_operations for capidev ----------------------------- */
 645
 646 static ssize_t
 647 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 648 {
 649         struct capidev *cdev = file->private_data;
 650         struct sk_buff *skb;
 651         size_t copied;
 652         int err;
 653
 654         if (!cdev->ap.applid)
 655                 return -ENODEV;
 656
 657         skb = skb_dequeue(&cdev->recvqueue);
 658         if (!skb) {
 659                 if (file->f_flags & O_NONBLOCK)
 660                         return -EAGAIN;
 661                 err = wait_event_interruptible(cdev->recvwait,
 662                                                (skb = skb_dequeue(&cdev->recvqueue)));
 663                 if (err)
 664                         return err;
 665         }
 666         if (skb->len > count) {
 667                 skb_queue_head(&cdev->recvqueue, skb);
 668                 return -EMSGSIZE;
 669         }
 670         if (copy_to_user(buf, skb->data, skb->len)) {
 671                 skb_queue_head(&cdev->recvqueue, skb);
 672                 return -EFAULT;
 673         }
 674         copied = skb->len;
 675
 676         kfree_skb(skb);
 677
 678         return copied;
 679 }
 680
 681 static ssize_t
 682 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 683 {
 684         struct capidev *cdev = file->private_data;
 685         struct sk_buff *skb;
 686         u16 mlen;
 687
 688         if (!cdev->ap.applid)
 689                 return -ENODEV;
 690
 691         if (count < CAPIMSG_BASELEN)
 692                 return -EINVAL;
 693
 694         skb = alloc_skb(count, GFP_USER);
 695         if (!skb)
 696                 return -ENOMEM;
 697
 698         if (copy_from_user(skb_put(skb, count), buf, count)) {
 699                 kfree_skb(skb);
 700                 return -EFAULT;
 701         }
 702         mlen = CAPIMSG_LEN(skb->data);
 703         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 704                 if (count < CAPI_DATA_B3_REQ_LEN ||
 705                     (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 706                         kfree_skb(skb);
 707                         return -EINVAL;
 708                 }
 709         } else {
 710                 if (mlen != count) {
 711                         kfree_skb(skb);
 712                         return -EINVAL;
 713                 }
 714         }
 715         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 716
 717         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 718                 if (count < CAPI_DISCONNECT_B3_RESP_LEN) {
 719                         kfree_skb(skb);
 720                         return -EINVAL;
 721                 }
 722                 mutex_lock(&cdev->lock);
 723                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 724                 mutex_unlock(&cdev->lock);
 725         }
 726
 727         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 728
 729         if (cdev->errcode) {
 730                 kfree_skb(skb);
 731                 return -EIO;
 732         }
 733         return count;
 734 }
 735
 736 static __poll_t
 737 capi_poll(struct file *file, poll_table *wait)
 738 {
 739         struct capidev *cdev = file->private_data;
 740         __poll_t mask = 0;
 741
 742         if (!cdev->ap.applid)
 743                 return EPOLLERR;
 744
 745         poll_wait(file, &(cdev->recvwait), wait);
 746         mask = EPOLLOUT | EPOLLWRNORM;
 747         if (!skb_queue_empty_lockless(&cdev->recvqueue))
 748                 mask |= EPOLLIN | EPOLLRDNORM;
 749         return mask;
 750 }
 751
 752 static int
 753 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 754 {
 755         struct capidev *cdev = file->private_data;
 756         capi_ioctl_struct data;
 757         int retval = -EINVAL;
 758         void __user *argp = (void __user *)arg;
 759
 760         switch (cmd) {
 761         case CAPI_REGISTER:
 762                 mutex_lock(&cdev->lock);
 763
 764                 if (cdev->ap.applid) {
 765                         retval = -EEXIST;
 766                         goto register_out;
 767                 }
 768                 if (copy_from_user(&cdev->ap.rparam, argp,
 769                                    sizeof(struct capi_register_params))) {
 770                         retval = -EFAULT;
 771                         goto register_out;
 772                 }
 773                 cdev->ap.private = cdev;
 774                 cdev->ap.recv_message = capi_recv_message;
 775                 cdev->errcode = capi20_register(&cdev->ap);
 776                 retval = (int)cdev->ap.applid;
 777                 if (cdev->errcode) {
 778                         cdev->ap.applid = 0;
 779                         retval = -EIO;
 780                 }
 781
 782 register_out:
 783                 mutex_unlock(&cdev->lock);
 784                 return retval;
 785
 786         case CAPI_GET_VERSION:
 787                 if (copy_from_user(&data.contr, argp,
 788                                    sizeof(data.contr)))
 789                         return -EFAULT;
 790                 cdev->errcode = capi20_get_version(data.contr, &data.version);
 791                 if (cdev->errcode)
 792                         return -EIO;
 793                 if (copy_to_user(argp, &data.version,
 794                                  sizeof(data.version)))
 795                         return -EFAULT;
 796                 return 0;
 797
 798         case CAPI_GET_SERIAL:
 799                 if (copy_from_user(&data.contr, argp,
 800                                    sizeof(data.contr)))
 801                         return -EFAULT;
 802                 cdev->errcode = capi20_get_serial(data.contr, data.serial);
 803                 if (cdev->errcode)
 804                         return -EIO;
 805                 if (copy_to_user(argp, data.serial,
 806                                  sizeof(data.serial)))
 807                         return -EFAULT;
 808                 return 0;
 809
 810         case CAPI_GET_PROFILE:
 811                 if (copy_from_user(&data.contr, argp,
 812                                    sizeof(data.contr)))
 813                         return -EFAULT;
 814
 815                 if (data.contr == 0) {
 816                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 817                         if (cdev->errcode)
 818                                 return -EIO;
 819
 820                         retval = copy_to_user(argp,
 821                                               &data.profile.ncontroller,
 822                                               sizeof(data.profile.ncontroller));
 823
 824                 } else {
 825                         cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 826                         if (cdev->errcode)
 827                                 return -EIO;
 828
 829                         retval = copy_to_user(argp, &data.profile,
 830                                               sizeof(data.profile));
 831                 }
 832                 if (retval)
 833                         return -EFAULT;
 834                 return 0;
 835
 836         case CAPI_GET_MANUFACTURER:
 837                 if (copy_from_user(&data.contr, argp,
 838                                    sizeof(data.contr)))
 839                         return -EFAULT;
 840                 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 841                 if (cdev->errcode)
 842                         return -EIO;
 843
 844                 if (copy_to_user(argp, data.manufacturer,
 845                                  sizeof(data.manufacturer)))
 846                         return -EFAULT;
 847
 848                 return 0;
 849
 850         case CAPI_GET_ERRCODE:
 851                 data.errcode = cdev->errcode;
 852                 cdev->errcode = CAPI_NOERROR;
 853                 if (arg) {
 854                         if (copy_to_user(argp, &data.errcode,
 855                                          sizeof(data.errcode)))
 856                                 return -EFAULT;
 857                 }
 858                 return data.errcode;
 859
 860         case CAPI_INSTALLED:
 861                 if (capi20_isinstalled() == CAPI_NOERROR)
 862                         return 0;
 863                 return -ENXIO;
 864
 865         case CAPI_MANUFACTURER_CMD: {
 866                 struct capi_manufacturer_cmd mcmd;
 867                 if (!capable(CAP_SYS_ADMIN))
 868                         return -EPERM;
 869                 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 870                         return -EFAULT;
 871                 return capi20_manufacturer(mcmd.cmd, mcmd.data);
 872         }
 873         case CAPI_SET_FLAGS:
 874         case CAPI_CLR_FLAGS: {
 875                 unsigned userflags;
 876
 877                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 878                         return -EFAULT;
 879
 880                 mutex_lock(&cdev->lock);
 881                 if (cmd == CAPI_SET_FLAGS)
 882                         cdev->userflags |= userflags;
 883                 else
 884                         cdev->userflags &= ~userflags;
 885                 mutex_unlock(&cdev->lock);
 886                 return 0;
 887         }
 888         case CAPI_GET_FLAGS:
 889                 if (copy_to_user(argp, &cdev->userflags,
 890                                  sizeof(cdev->userflags)))
 891                         return -EFAULT;
 892                 return 0;
 893
 894 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 895         case CAPI_NCCI_OPENCOUNT:
 896                 return 0;
 897
 898 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 899         case CAPI_NCCI_OPENCOUNT: {
 900                 struct capincci *nccip;
 901                 unsigned ncci;
 902                 int count = 0;
 903
 904                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 905                         return -EFAULT;
 906
 907                 mutex_lock(&cdev->lock);
 908                 nccip = capincci_find(cdev, (u32)ncci);
 909                 if (nccip)
 910                         count = capincci_minor_opencount(nccip);
 911                 mutex_unlock(&cdev->lock);
 912                 return count;
 913         }
 914
 915         case CAPI_NCCI_GETUNIT: {
 916                 struct capincci *nccip;
 917                 struct capiminor *mp;
 918                 unsigned ncci;
 919                 int unit = -ESRCH;
 920
 921                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 922                         return -EFAULT;
 923
 924                 mutex_lock(&cdev->lock);
 925                 nccip = capincci_find(cdev, (u32)ncci);
 926                 if (nccip) {
 927                         mp = nccip->minorp;
 928                         if (mp)
 929                                 unit = mp->minor;
 930                 }
 931                 mutex_unlock(&cdev->lock);
 932                 return unit;
 933         }
 934 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 935
 936         default:
 937                 return -EINVAL;
 938         }
 939 }
 940
 941 static long
 942 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 943 {
 944         int ret;
 945
 946         mutex_lock(&capi_mutex);
 947         ret = capi_ioctl(file, cmd, arg);
 948         mutex_unlock(&capi_mutex);
 949
 950         return ret;
 951 }
 952
 953 #ifdef CONFIG_COMPAT
 954 static long
 955 capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 956 {
 957         int ret;
 958
 959         if (cmd == CAPI_MANUFACTURER_CMD) {
 960                 struct {
 961                         compat_ulong_t cmd;
 962                         compat_uptr_t data;
 963                 } mcmd32;
 964
 965                 if (!capable(CAP_SYS_ADMIN))
 966                         return -EPERM;
 967                 if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
 968                         return -EFAULT;
 969
 970                 mutex_lock(&capi_mutex);
 971                 ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
 972                 mutex_unlock(&capi_mutex);
 973
 974                 return ret;
 975         }
 976
 977         return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 978 }
 979 #endif
 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 stream_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         .unlocked_ioctl = capi_unlocked_ioctl,
1027 #ifdef CONFIG_COMPAT
1028         .compat_ioctl   = capi_compat_ioctl,
1029 #endif
1030         .open           = capi_open,
1031         .release        = capi_release,
1032 };
1033
1034 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1035 /* -------- tty_operations for capincci ----------------------------- */
1036
1037 static int
1038 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1039 {
1040         struct capiminor *mp = capiminor_get(tty->index);
1041         int ret = tty_standard_install(driver, tty);
1042
1043         if (ret == 0)
1044                 tty->driver_data = mp;
1045         else
1046                 capiminor_put(mp);
1047         return ret;
1048 }
1049
1050 static void capinc_tty_cleanup(struct tty_struct *tty)
1051 {
1052         struct capiminor *mp = tty->driver_data;
1053         tty->driver_data = NULL;
1054         capiminor_put(mp);
1055 }
1056
1057 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1058 {
1059         struct capiminor *mp = tty->driver_data;
1060         int err;
1061
1062         err = tty_port_open(&mp->port, tty, filp);
1063         if (err)
1064                 return err;
1065
1066         handle_minor_recv(mp);
1067         return 0;
1068 }
1069
1070 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1071 {
1072         struct capiminor *mp = tty->driver_data;
1073
1074         tty_port_close(&mp->port, tty, filp);
1075 }
1076
1077 static int capinc_tty_write(struct tty_struct *tty,
1078                             const unsigned char *buf, int count)
1079 {
1080         struct capiminor *mp = tty->driver_data;
1081         struct sk_buff *skb;
1082
1083         pr_debug("capinc_tty_write(count=%d)\n", count);
1084
1085         spin_lock_bh(&mp->outlock);
1086         skb = mp->outskb;
1087         if (skb) {
1088                 mp->outskb = NULL;
1089                 __skb_queue_tail(&mp->outqueue, skb);
1090                 mp->outbytes += skb->len;
1091         }
1092
1093         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1094         if (!skb) {
1095                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1096                 spin_unlock_bh(&mp->outlock);
1097                 return -ENOMEM;
1098         }
1099
1100         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1101         skb_put_data(skb, buf, count);
1102
1103         __skb_queue_tail(&mp->outqueue, skb);
1104         mp->outbytes += skb->len;
1105         spin_unlock_bh(&mp->outlock);
1106
1107         handle_minor_send(mp);
1108
1109         return count;
1110 }
1111
1112 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1113 {
1114         struct capiminor *mp = tty->driver_data;
1115         bool invoke_send = false;
1116         struct sk_buff *skb;
1117         int ret = 1;
1118
1119         pr_debug("capinc_put_char(%u)\n", ch);
1120
1121         spin_lock_bh(&mp->outlock);
1122         skb = mp->outskb;
1123         if (skb) {
1124                 if (skb_tailroom(skb) > 0) {
1125                         skb_put_u8(skb, ch);
1126                         goto unlock_out;
1127                 }
1128                 mp->outskb = NULL;
1129                 __skb_queue_tail(&mp->outqueue, skb);
1130                 mp->outbytes += skb->len;
1131                 invoke_send = true;
1132         }
1133
1134         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1135         if (skb) {
1136                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1137                 skb_put_u8(skb, ch);
1138                 mp->outskb = skb;
1139         } else {
1140                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1141                 ret = 0;
1142         }
1143
1144 unlock_out:
1145         spin_unlock_bh(&mp->outlock);
1146
1147         if (invoke_send)
1148                 handle_minor_send(mp);
1149
1150         return ret;
1151 }
1152
1153 static void capinc_tty_flush_chars(struct tty_struct *tty)
1154 {
1155         struct capiminor *mp = tty->driver_data;
1156         struct sk_buff *skb;
1157
1158         pr_debug("capinc_tty_flush_chars\n");
1159
1160         spin_lock_bh(&mp->outlock);
1161         skb = mp->outskb;
1162         if (skb) {
1163                 mp->outskb = NULL;
1164                 __skb_queue_tail(&mp->outqueue, skb);
1165                 mp->outbytes += skb->len;
1166                 spin_unlock_bh(&mp->outlock);
1167
1168                 handle_minor_send(mp);
1169         } else
1170                 spin_unlock_bh(&mp->outlock);
1171
1172         handle_minor_recv(mp);
1173 }
1174
1175 static int capinc_tty_write_room(struct tty_struct *tty)
1176 {
1177         struct capiminor *mp = tty->driver_data;
1178         int room;
1179
1180         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1181         room *= CAPI_MAX_BLKSIZE;
1182         pr_debug("capinc_tty_write_room = %d\n", room);
1183         return room;
1184 }
1185
1186 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1187 {
1188         struct capiminor *mp = tty->driver_data;
1189
1190         pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1191                  mp->outbytes, mp->nack,
1192                  skb_queue_len(&mp->outqueue),
1193                  skb_queue_len(&mp->inqueue));
1194         return mp->outbytes;
1195 }
1196
1197 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
1198 {
1199         pr_debug("capinc_tty_set_termios\n");
1200 }
1201
1202 static void capinc_tty_throttle(struct tty_struct *tty)
1203 {
1204         struct capiminor *mp = tty->driver_data;
1205         pr_debug("capinc_tty_throttle\n");
1206         mp->ttyinstop = 1;
1207 }
1208
1209 static void capinc_tty_unthrottle(struct tty_struct *tty)
1210 {
1211         struct capiminor *mp = tty->driver_data;
1212
1213         pr_debug("capinc_tty_unthrottle\n");
1214         mp->ttyinstop = 0;
1215         handle_minor_recv(mp);
1216 }
1217
1218 static void capinc_tty_stop(struct tty_struct *tty)
1219 {
1220         struct capiminor *mp = tty->driver_data;
1221
1222         pr_debug("capinc_tty_stop\n");
1223         mp->ttyoutstop = 1;
1224 }
1225
1226 static void capinc_tty_start(struct tty_struct *tty)
1227 {
1228         struct capiminor *mp = tty->driver_data;
1229
1230         pr_debug("capinc_tty_start\n");
1231         mp->ttyoutstop = 0;
1232         handle_minor_send(mp);
1233 }
1234
1235 static void capinc_tty_hangup(struct tty_struct *tty)
1236 {
1237         struct capiminor *mp = tty->driver_data;
1238
1239         pr_debug("capinc_tty_hangup\n");
1240         tty_port_hangup(&mp->port);
1241 }
1242
1243 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1244 {
1245         pr_debug("capinc_tty_break_ctl(%d)\n", state);
1246         return 0;
1247 }
1248
1249 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1250 {
1251         pr_debug("capinc_tty_flush_buffer\n");
1252 }
1253
1254 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1255 {
1256         pr_debug("capinc_tty_set_ldisc\n");
1257 }
1258
1259 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1260 {
1261         pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1262 }
1263
1264 static const struct tty_operations capinc_ops = {
1265         .open = capinc_tty_open,
1266         .close = capinc_tty_close,
1267         .write = capinc_tty_write,
1268         .put_char = capinc_tty_put_char,
1269         .flush_chars = capinc_tty_flush_chars,
1270         .write_room = capinc_tty_write_room,
1271         .chars_in_buffer = capinc_tty_chars_in_buffer,
1272         .set_termios = capinc_tty_set_termios,
1273         .throttle = capinc_tty_throttle,
1274         .unthrottle = capinc_tty_unthrottle,
1275         .stop = capinc_tty_stop,
1276         .start = capinc_tty_start,
1277         .hangup = capinc_tty_hangup,
1278         .break_ctl = capinc_tty_break_ctl,
1279         .flush_buffer = capinc_tty_flush_buffer,
1280         .set_ldisc = capinc_tty_set_ldisc,
1281         .send_xchar = capinc_tty_send_xchar,
1282         .install = capinc_tty_install,
1283         .cleanup = capinc_tty_cleanup,
1284 };
1285
1286 static int __init capinc_tty_init(void)
1287 {
1288         struct tty_driver *drv;
1289         int err;
1290
1291         if (capi_ttyminors > CAPINC_MAX_PORTS)
1292                 capi_ttyminors = CAPINC_MAX_PORTS;
1293         if (capi_ttyminors <= 0)
1294                 capi_ttyminors = CAPINC_NR_PORTS;
1295
1296         capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1297                              GFP_KERNEL);
1298         if (!capiminors)
1299                 return -ENOMEM;
1300
1301         drv = alloc_tty_driver(capi_ttyminors);
1302         if (!drv) {
1303                 kfree(capiminors);
1304                 return -ENOMEM;
1305         }
1306         drv->driver_name = "capi_nc";
1307         drv->name = "capi!";
1308         drv->major = 0;
1309         drv->minor_start = 0;
1310         drv->type = TTY_DRIVER_TYPE_SERIAL;
1311         drv->subtype = SERIAL_TYPE_NORMAL;
1312         drv->init_termios = tty_std_termios;
1313         drv->init_termios.c_iflag = ICRNL;
1314         drv->init_termios.c_oflag = OPOST | ONLCR;
1315         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1316         drv->init_termios.c_lflag = 0;
1317         drv->flags =
1318                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1319                 TTY_DRIVER_DYNAMIC_DEV;
1320         tty_set_operations(drv, &capinc_ops);
1321
1322         err = tty_register_driver(drv);
1323         if (err) {
1324                 put_tty_driver(drv);
1325                 kfree(capiminors);
1326                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1327                 return err;
1328         }
1329         capinc_tty_driver = drv;
1330         return 0;
1331 }
1332
1333 static void __exit capinc_tty_exit(void)
1334 {
1335         tty_unregister_driver(capinc_tty_driver);
1336         put_tty_driver(capinc_tty_driver);
1337         kfree(capiminors);
1338 }
1339
1340 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1341
1342 static inline int capinc_tty_init(void)
1343 {
1344         return 0;
1345 }
1346
1347 static inline void capinc_tty_exit(void) { }
1348
1349 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1350
1351 /* -------- /proc functions ----------------------------------------- */
1352
1353 /*
1354  * /proc/capi/capi20:
1355  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1356  */
1357 static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1358 {
1359         struct capidev *cdev;
1360         struct list_head *l;
1361
1362         mutex_lock(&capidev_list_lock);
1363         list_for_each(l, &capidev_list) {
1364                 cdev = list_entry(l, struct capidev, list);
1365                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1366                            cdev->ap.applid,
1367                            cdev->ap.nrecvctlpkt,
1368                            cdev->ap.nrecvdatapkt,
1369                            cdev->ap.nsentctlpkt,
1370                            cdev->ap.nsentdatapkt);
1371         }
1372         mutex_unlock(&capidev_list_lock);
1373         return 0;
1374 }
1375
1376 /*
1377  * /proc/capi/capi20ncci:
1378  *  applid ncci
1379  */
1380 static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1381 {
1382         struct capidev *cdev;
1383         struct capincci *np;
1384
1385         mutex_lock(&capidev_list_lock);
1386         list_for_each_entry(cdev, &capidev_list, list) {
1387                 mutex_lock(&cdev->lock);
1388                 list_for_each_entry(np, &cdev->nccis, list)
1389                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1390                 mutex_unlock(&cdev->lock);
1391         }
1392         mutex_unlock(&capidev_list_lock);
1393         return 0;
1394 }
1395
1396 static void __init proc_init(void)
1397 {
1398         proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1399         proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1400 }
1401
1402 static void __exit proc_exit(void)
1403 {
1404         remove_proc_entry("capi/capi20", NULL);
1405         remove_proc_entry("capi/capi20ncci", NULL);
1406 }
1407
1408 /* -------- init function and module interface ---------------------- */
1409
1410
1411 static int __init capi_init(void)
1412 {
1413         const char *compileinfo;
1414         int major_ret;
1415
1416         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1417         if (major_ret < 0) {
1418                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1419                 return major_ret;
1420         }
1421         capi_class = class_create(THIS_MODULE, "capi");
1422         if (IS_ERR(capi_class)) {
1423                 unregister_chrdev(capi_major, "capi20");
1424                 return PTR_ERR(capi_class);
1425         }
1426
1427         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1428
1429         if (capinc_tty_init() < 0) {
1430                 device_destroy(capi_class, MKDEV(capi_major, 0));
1431                 class_destroy(capi_class);
1432                 unregister_chrdev(capi_major, "capi20");
1433                 return -ENOMEM;
1434         }
1435
1436         proc_init();
1437
1438 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1439         compileinfo = " (middleware)";
1440 #else
1441         compileinfo = " (no middleware)";
1442 #endif
1443         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1444                capi_major, compileinfo);
1445
1446         return 0;
1447 }
1448
1449 static void __exit capi_exit(void)
1450 {
1451         proc_exit();
1452
1453         device_destroy(capi_class, MKDEV(capi_major, 0));
1454         class_destroy(capi_class);
1455         unregister_chrdev(capi_major, "capi20");
1456
1457         capinc_tty_exit();
1458 }
1459
1460 module_init(capi_init);
1461 module_exit(capi_exit);