linux/drivers/isdn/capi/capi.c
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   1/* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
   2 *
   3 * CAPI 2.0 Interface for Linux
   4 *
   5 * Copyright 1996 by Carsten Paeth <calle@calle.de>
   6 *
   7 * This software may be used and distributed according to the terms
   8 * of the GNU General Public License, incorporated herein by reference.
   9 *
  10 */
  11
  12#include <linux/compiler.h>
  13#include <linux/module.h>
  14#include <linux/ethtool.h>
  15#include <linux/errno.h>
  16#include <linux/kernel.h>
  17#include <linux/major.h>
  18#include <linux/sched.h>
  19#include <linux/slab.h>
  20#include <linux/fcntl.h>
  21#include <linux/fs.h>
  22#include <linux/signal.h>
  23#include <linux/mutex.h>
  24#include <linux/mm.h>
  25#include <linux/timer.h>
  26#include <linux/wait.h>
  27#include <linux/tty.h>
  28#include <linux/netdevice.h>
  29#include <linux/ppp_defs.h>
  30#include <linux/ppp-ioctl.h>
  31#include <linux/skbuff.h>
  32#include <linux/proc_fs.h>
  33#include <linux/seq_file.h>
  34#include <linux/poll.h>
  35#include <linux/capi.h>
  36#include <linux/kernelcapi.h>
  37#include <linux/init.h>
  38#include <linux/device.h>
  39#include <linux/moduleparam.h>
  40#include <linux/isdn/capiutil.h>
  41#include <linux/isdn/capicmd.h>
  42
  43#include "kcapi.h"
  44
  45MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface");
  46MODULE_AUTHOR("Carsten Paeth");
  47MODULE_LICENSE("GPL");
  48
  49/* -------- driver information -------------------------------------- */
  50
  51static DEFINE_MUTEX(capi_mutex);
  52static struct class *capi_class;
  53static int capi_major = 68;             /* allocated */
  54
  55module_param_named(major, capi_major, uint, 0);
  56
  57#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  58#define CAPINC_NR_PORTS         32
  59#define CAPINC_MAX_PORTS        256
  60
  61static int capi_ttyminors = CAPINC_NR_PORTS;
  62
  63module_param_named(ttyminors, capi_ttyminors, uint, 0);
  64#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  65
  66/* -------- defines ------------------------------------------------- */
  67
  68#define CAPINC_MAX_RECVQUEUE    10
  69#define CAPINC_MAX_SENDQUEUE    10
  70#define CAPI_MAX_BLKSIZE        2048
  71
  72/* -------- data structures ----------------------------------------- */
  73
  74struct capidev;
  75struct capincci;
  76struct capiminor;
  77
  78struct ackqueue_entry {
  79        struct list_head        list;
  80        u16                     datahandle;
  81};
  82
  83struct capiminor {
  84        unsigned int      minor;
  85
  86        struct capi20_appl      *ap;
  87        u32                     ncci;
  88        atomic_t                datahandle;
  89        atomic_t                msgid;
  90
  91        struct tty_port port;
  92        int                ttyinstop;
  93        int                ttyoutstop;
  94
  95        struct sk_buff_head     inqueue;
  96
  97        struct sk_buff_head     outqueue;
  98        int                     outbytes;
  99        struct sk_buff          *outskb;
 100        spinlock_t              outlock;
 101
 102        /* transmit path */
 103        struct list_head ackqueue;
 104        int nack;
 105        spinlock_t ackqlock;
 106};
 107
 108struct capincci {
 109        struct list_head list;
 110        u32              ncci;
 111        struct capidev  *cdev;
 112#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 113        struct capiminor *minorp;
 114#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 115};
 116
 117struct capidev {
 118        struct list_head list;
 119        struct capi20_appl ap;
 120        u16             errcode;
 121        unsigned        userflags;
 122
 123        struct sk_buff_head recvqueue;
 124        wait_queue_head_t recvwait;
 125
 126        struct list_head nccis;
 127
 128        struct mutex lock;
 129};
 130
 131/* -------- global variables ---------------------------------------- */
 132
 133static DEFINE_MUTEX(capidev_list_lock);
 134static LIST_HEAD(capidev_list);
 135
 136#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 137
 138static DEFINE_SPINLOCK(capiminors_lock);
 139static struct capiminor **capiminors;
 140
 141static struct tty_driver *capinc_tty_driver;
 142
 143/* -------- datahandles --------------------------------------------- */
 144
 145static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 146{
 147        struct ackqueue_entry *n;
 148
 149        n = kmalloc(sizeof(*n), GFP_ATOMIC);
 150        if (unlikely(!n)) {
 151                printk(KERN_ERR "capi: alloc datahandle failed\n");
 152                return -1;
 153        }
 154        n->datahandle = datahandle;
 155        INIT_LIST_HEAD(&n->list);
 156        spin_lock_bh(&mp->ackqlock);
 157        list_add_tail(&n->list, &mp->ackqueue);
 158        mp->nack++;
 159        spin_unlock_bh(&mp->ackqlock);
 160        return 0;
 161}
 162
 163static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 164{
 165        struct ackqueue_entry *p, *tmp;
 166
 167        spin_lock_bh(&mp->ackqlock);
 168        list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 169                if (p->datahandle == datahandle) {
 170                        list_del(&p->list);
 171                        mp->nack--;
 172                        spin_unlock_bh(&mp->ackqlock);
 173                        kfree(p);
 174                        return 0;
 175                }
 176        }
 177        spin_unlock_bh(&mp->ackqlock);
 178        return -1;
 179}
 180
 181static void capiminor_del_all_ack(struct capiminor *mp)
 182{
 183        struct ackqueue_entry *p, *tmp;
 184
 185        list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 186                list_del(&p->list);
 187                kfree(p);
 188                mp->nack--;
 189        }
 190}
 191
 192
 193/* -------- struct capiminor ---------------------------------------- */
 194
 195static void capiminor_destroy(struct tty_port *port)
 196{
 197        struct capiminor *mp = container_of(port, struct capiminor, port);
 198
 199        kfree_skb(mp->outskb);
 200        skb_queue_purge(&mp->inqueue);
 201        skb_queue_purge(&mp->outqueue);
 202        capiminor_del_all_ack(mp);
 203        kfree(mp);
 204}
 205
 206static const struct tty_port_operations capiminor_port_ops = {
 207        .destruct = capiminor_destroy,
 208};
 209
 210static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 211{
 212        struct capiminor *mp;
 213        struct device *dev;
 214        unsigned int minor;
 215
 216        mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 217        if (!mp) {
 218                printk(KERN_ERR "capi: can't alloc capiminor\n");
 219                return NULL;
 220        }
 221
 222        mp->ap = ap;
 223        mp->ncci = ncci;
 224        INIT_LIST_HEAD(&mp->ackqueue);
 225        spin_lock_init(&mp->ackqlock);
 226
 227        skb_queue_head_init(&mp->inqueue);
 228        skb_queue_head_init(&mp->outqueue);
 229        spin_lock_init(&mp->outlock);
 230
 231        tty_port_init(&mp->port);
 232        mp->port.ops = &capiminor_port_ops;
 233
 234        /* Allocate the least unused minor number. */
 235        spin_lock(&capiminors_lock);
 236        for (minor = 0; minor < capi_ttyminors; minor++)
 237                if (!capiminors[minor]) {
 238                        capiminors[minor] = mp;
 239                        break;
 240                }
 241        spin_unlock(&capiminors_lock);
 242
 243        if (minor == capi_ttyminors) {
 244                printk(KERN_NOTICE "capi: out of minors\n");
 245                goto err_out1;
 246        }
 247
 248        mp->minor = minor;
 249
 250        dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
 251                        NULL);
 252        if (IS_ERR(dev))
 253                goto err_out2;
 254
 255        return mp;
 256
 257err_out2:
 258        spin_lock(&capiminors_lock);
 259        capiminors[minor] = NULL;
 260        spin_unlock(&capiminors_lock);
 261
 262err_out1:
 263        tty_port_put(&mp->port);
 264        return NULL;
 265}
 266
 267static struct capiminor *capiminor_get(unsigned int minor)
 268{
 269        struct capiminor *mp;
 270
 271        spin_lock(&capiminors_lock);
 272        mp = capiminors[minor];
 273        if (mp)
 274                tty_port_get(&mp->port);
 275        spin_unlock(&capiminors_lock);
 276
 277        return mp;
 278}
 279
 280static inline void capiminor_put(struct capiminor *mp)
 281{
 282        tty_port_put(&mp->port);
 283}
 284
 285static void capiminor_free(struct capiminor *mp)
 286{
 287        tty_unregister_device(capinc_tty_driver, mp->minor);
 288
 289        spin_lock(&capiminors_lock);
 290        capiminors[mp->minor] = NULL;
 291        spin_unlock(&capiminors_lock);
 292
 293        capiminor_put(mp);
 294}
 295
 296/* -------- struct capincci ----------------------------------------- */
 297
 298static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 299{
 300        if (cdev->userflags & CAPIFLAG_HIGHJACKING)
 301                np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 302}
 303
 304static void capincci_free_minor(struct capincci *np)
 305{
 306        struct capiminor *mp = np->minorp;
 307        struct tty_struct *tty;
 308
 309        if (mp) {
 310                tty = tty_port_tty_get(&mp->port);
 311                if (tty) {
 312                        tty_vhangup(tty);
 313                        tty_kref_put(tty);
 314                }
 315
 316                capiminor_free(mp);
 317        }
 318}
 319
 320static inline unsigned int capincci_minor_opencount(struct capincci *np)
 321{
 322        struct capiminor *mp = np->minorp;
 323        unsigned int count = 0;
 324        struct tty_struct *tty;
 325
 326        if (mp) {
 327                tty = tty_port_tty_get(&mp->port);
 328                if (tty) {
 329                        count = tty->count;
 330                        tty_kref_put(tty);
 331                }
 332        }
 333        return count;
 334}
 335
 336#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 337
 338static inline void
 339capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 340static inline void capincci_free_minor(struct capincci *np) { }
 341
 342#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 343
 344static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 345{
 346        struct capincci *np;
 347
 348        np = kzalloc(sizeof(*np), GFP_KERNEL);
 349        if (!np)
 350                return NULL;
 351        np->ncci = ncci;
 352        np->cdev = cdev;
 353
 354        capincci_alloc_minor(cdev, np);
 355
 356        list_add_tail(&np->list, &cdev->nccis);
 357
 358        return np;
 359}
 360
 361static void capincci_free(struct capidev *cdev, u32 ncci)
 362{
 363        struct capincci *np, *tmp;
 364
 365        list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 366                if (ncci == 0xffffffff || np->ncci == ncci) {
 367                        capincci_free_minor(np);
 368                        list_del(&np->list);
 369                        kfree(np);
 370                }
 371}
 372
 373#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 374static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 375{
 376        struct capincci *np;
 377
 378        list_for_each_entry(np, &cdev->nccis, list)
 379                if (np->ncci == ncci)
 380                        return np;
 381        return NULL;
 382}
 383
 384/* -------- handle data queue --------------------------------------- */
 385
 386static struct sk_buff *
 387gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 388{
 389        struct sk_buff *nskb;
 390        nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
 391        if (nskb) {
 392                u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 393                unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 394                capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 395                capimsg_setu16(s, 2, mp->ap->applid);
 396                capimsg_setu8 (s, 4, CAPI_DATA_B3);
 397                capimsg_setu8 (s, 5, CAPI_RESP);
 398                capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
 399                capimsg_setu32(s, 8, mp->ncci);
 400                capimsg_setu16(s, 12, datahandle);
 401        }
 402        return nskb;
 403}
 404
 405static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 406{
 407        unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
 408        struct tty_struct *tty;
 409        struct sk_buff *nskb;
 410        u16 errcode, datahandle;
 411        struct tty_ldisc *ld;
 412        int ret = -1;
 413
 414        tty = tty_port_tty_get(&mp->port);
 415        if (!tty) {
 416                pr_debug("capi: currently no receiver\n");
 417                return -1;
 418        }
 419
 420        ld = tty_ldisc_ref(tty);
 421        if (!ld) {
 422                /* fatal error, do not requeue */
 423                ret = 0;
 424                kfree_skb(skb);
 425                goto deref_tty;
 426        }
 427
 428        if (ld->ops->receive_buf == NULL) {
 429                pr_debug("capi: ldisc has no receive_buf function\n");
 430                /* fatal error, do not requeue */
 431                goto free_skb;
 432        }
 433        if (mp->ttyinstop) {
 434                pr_debug("capi: recv tty throttled\n");
 435                goto deref_ldisc;
 436        }
 437
 438        if (tty->receive_room < datalen) {
 439                pr_debug("capi: no room in tty\n");
 440                goto deref_ldisc;
 441        }
 442
 443        nskb = gen_data_b3_resp_for(mp, skb);
 444        if (!nskb) {
 445                printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 446                goto deref_ldisc;
 447        }
 448
 449        datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 450
 451        errcode = capi20_put_message(mp->ap, nskb);
 452
 453        if (errcode == CAPI_NOERROR) {
 454                skb_pull(skb, CAPIMSG_LEN(skb->data));
 455                pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
 456                         datahandle, skb->len);
 457                ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 458        } else {
 459                printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 460                       errcode);
 461                kfree_skb(nskb);
 462
 463                if (errcode == CAPI_SENDQUEUEFULL)
 464                        goto deref_ldisc;
 465        }
 466
 467free_skb:
 468        ret = 0;
 469        kfree_skb(skb);
 470
 471deref_ldisc:
 472        tty_ldisc_deref(ld);
 473
 474deref_tty:
 475        tty_kref_put(tty);
 476        return ret;
 477}
 478
 479static void handle_minor_recv(struct capiminor *mp)
 480{
 481        struct sk_buff *skb;
 482
 483        while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
 484                if (handle_recv_skb(mp, skb) < 0) {
 485                        skb_queue_head(&mp->inqueue, skb);
 486                        return;
 487                }
 488}
 489
 490static void handle_minor_send(struct capiminor *mp)
 491{
 492        struct tty_struct *tty;
 493        struct sk_buff *skb;
 494        u16 len;
 495        u16 errcode;
 496        u16 datahandle;
 497
 498        tty = tty_port_tty_get(&mp->port);
 499        if (!tty)
 500                return;
 501
 502        if (mp->ttyoutstop) {
 503                pr_debug("capi: send: tty stopped\n");
 504                tty_kref_put(tty);
 505                return;
 506        }
 507
 508        while (1) {
 509                spin_lock_bh(&mp->outlock);
 510                skb = __skb_dequeue(&mp->outqueue);
 511                if (!skb) {
 512                        spin_unlock_bh(&mp->outlock);
 513                        break;
 514                }
 515                len = (u16)skb->len;
 516                mp->outbytes -= len;
 517                spin_unlock_bh(&mp->outlock);
 518
 519                datahandle = atomic_inc_return(&mp->datahandle);
 520                skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 521                memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 522                capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 523                capimsg_setu16(skb->data, 2, mp->ap->applid);
 524                capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 525                capimsg_setu8 (skb->data, 5, CAPI_REQ);
 526                capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
 527                capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 528                capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 529                capimsg_setu16(skb->data, 16, len);     /* Data length */
 530                capimsg_setu16(skb->data, 18, datahandle);
 531                capimsg_setu16(skb->data, 20, 0);       /* Flags */
 532
 533                if (capiminor_add_ack(mp, datahandle) < 0) {
 534                        skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 535
 536                        spin_lock_bh(&mp->outlock);
 537                        __skb_queue_head(&mp->outqueue, skb);
 538                        mp->outbytes += len;
 539                        spin_unlock_bh(&mp->outlock);
 540
 541                        break;
 542                }
 543                errcode = capi20_put_message(mp->ap, skb);
 544                if (errcode == CAPI_NOERROR) {
 545                        pr_debug("capi: DATA_B3_REQ %u len=%u\n",
 546                                 datahandle, len);
 547                        continue;
 548                }
 549                capiminor_del_ack(mp, datahandle);
 550
 551                if (errcode == CAPI_SENDQUEUEFULL) {
 552                        skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 553
 554                        spin_lock_bh(&mp->outlock);
 555                        __skb_queue_head(&mp->outqueue, skb);
 556                        mp->outbytes += len;
 557                        spin_unlock_bh(&mp->outlock);
 558
 559                        break;
 560                }
 561
 562                /* ups, drop packet */
 563                printk(KERN_ERR "capi: put_message = %x\n", errcode);
 564                kfree_skb(skb);
 565        }
 566        tty_kref_put(tty);
 567}
 568
 569#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 570/* -------- function called by lower level -------------------------- */
 571
 572static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 573{
 574        struct capidev *cdev = ap->private;
 575#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 576        struct capiminor *mp;
 577        u16 datahandle;
 578        struct capincci *np;
 579#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 580
 581        mutex_lock(&cdev->lock);
 582
 583        if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 584                u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 585                if ((info & 0xff00) == 0)
 586                        capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 587        }
 588        if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 589                capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 590
 591        if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 592                skb_queue_tail(&cdev->recvqueue, skb);
 593                wake_up_interruptible(&cdev->recvwait);
 594                goto unlock_out;
 595        }
 596
 597#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 598        skb_queue_tail(&cdev->recvqueue, skb);
 599        wake_up_interruptible(&cdev->recvwait);
 600
 601#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 602
 603        np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 604        if (!np) {
 605                printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 606                skb_queue_tail(&cdev->recvqueue, skb);
 607                wake_up_interruptible(&cdev->recvwait);
 608                goto unlock_out;
 609        }
 610
 611        mp = np->minorp;
 612        if (!mp) {
 613                skb_queue_tail(&cdev->recvqueue, skb);
 614                wake_up_interruptible(&cdev->recvwait);
 615                goto unlock_out;
 616        }
 617        if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 618                datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
 619                pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
 620                         datahandle, skb->len-CAPIMSG_LEN(skb->data));
 621                skb_queue_tail(&mp->inqueue, skb);
 622
 623                handle_minor_recv(mp);
 624
 625        } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 626
 627                datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
 628                pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
 629                         datahandle,
 630                         CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
 631                kfree_skb(skb);
 632                capiminor_del_ack(mp, datahandle);
 633                tty_port_tty_wakeup(&mp->port);
 634                handle_minor_send(mp);
 635
 636        } else {
 637                /* ups, let capi application handle it :-) */
 638                skb_queue_tail(&cdev->recvqueue, skb);
 639                wake_up_interruptible(&cdev->recvwait);
 640        }
 641#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 642
 643unlock_out:
 644        mutex_unlock(&cdev->lock);
 645}
 646
 647/* -------- file_operations for capidev ----------------------------- */
 648
 649static ssize_t
 650capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 651{
 652        struct capidev *cdev = file->private_data;
 653        struct sk_buff *skb;
 654        size_t copied;
 655        int err;
 656
 657        if (!cdev->ap.applid)
 658                return -ENODEV;
 659
 660        skb = skb_dequeue(&cdev->recvqueue);
 661        if (!skb) {
 662                if (file->f_flags & O_NONBLOCK)
 663                        return -EAGAIN;
 664                err = wait_event_interruptible(cdev->recvwait,
 665                                               (skb = skb_dequeue(&cdev->recvqueue)));
 666                if (err)
 667                        return err;
 668        }
 669        if (skb->len > count) {
 670                skb_queue_head(&cdev->recvqueue, skb);
 671                return -EMSGSIZE;
 672        }
 673        if (copy_to_user(buf, skb->data, skb->len)) {
 674                skb_queue_head(&cdev->recvqueue, skb);
 675                return -EFAULT;
 676        }
 677        copied = skb->len;
 678
 679        kfree_skb(skb);
 680
 681        return copied;
 682}
 683
 684static ssize_t
 685capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 686{
 687        struct capidev *cdev = file->private_data;
 688        struct sk_buff *skb;
 689        u16 mlen;
 690
 691        if (!cdev->ap.applid)
 692                return -ENODEV;
 693
 694        if (count < CAPIMSG_BASELEN)
 695                return -EINVAL;
 696
 697        skb = alloc_skb(count, GFP_USER);
 698        if (!skb)
 699                return -ENOMEM;
 700
 701        if (copy_from_user(skb_put(skb, count), buf, count)) {
 702                kfree_skb(skb);
 703                return -EFAULT;
 704        }
 705        mlen = CAPIMSG_LEN(skb->data);
 706        if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 707                if (count < CAPI_DATA_B3_REQ_LEN ||
 708                    (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 709                        kfree_skb(skb);
 710                        return -EINVAL;
 711                }
 712        } else {
 713                if (mlen != count) {
 714                        kfree_skb(skb);
 715                        return -EINVAL;
 716                }
 717        }
 718        CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 719
 720        if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 721                if (count < CAPI_DISCONNECT_B3_RESP_LEN) {
 722                        kfree_skb(skb);
 723                        return -EINVAL;
 724                }
 725                mutex_lock(&cdev->lock);
 726                capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 727                mutex_unlock(&cdev->lock);
 728        }
 729
 730        cdev->errcode = capi20_put_message(&cdev->ap, skb);
 731
 732        if (cdev->errcode) {
 733                kfree_skb(skb);
 734                return -EIO;
 735        }
 736        return count;
 737}
 738
 739static __poll_t
 740capi_poll(struct file *file, poll_table *wait)
 741{
 742        struct capidev *cdev = file->private_data;
 743        __poll_t mask = 0;
 744
 745        if (!cdev->ap.applid)
 746                return EPOLLERR;
 747
 748        poll_wait(file, &(cdev->recvwait), wait);
 749        mask = EPOLLOUT | EPOLLWRNORM;
 750        if (!skb_queue_empty_lockless(&cdev->recvqueue))
 751                mask |= EPOLLIN | EPOLLRDNORM;
 752        return mask;
 753}
 754
 755static int
 756capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 757{
 758        struct capidev *cdev = file->private_data;
 759        capi_ioctl_struct data;
 760        int retval = -EINVAL;
 761        void __user *argp = (void __user *)arg;
 762
 763        switch (cmd) {
 764        case CAPI_REGISTER:
 765                mutex_lock(&cdev->lock);
 766
 767                if (cdev->ap.applid) {
 768                        retval = -EEXIST;
 769                        goto register_out;
 770                }
 771                if (copy_from_user(&cdev->ap.rparam, argp,
 772                                   sizeof(struct capi_register_params))) {
 773                        retval = -EFAULT;
 774                        goto register_out;
 775                }
 776                cdev->ap.private = cdev;
 777                cdev->ap.recv_message = capi_recv_message;
 778                cdev->errcode = capi20_register(&cdev->ap);
 779                retval = (int)cdev->ap.applid;
 780                if (cdev->errcode) {
 781                        cdev->ap.applid = 0;
 782                        retval = -EIO;
 783                }
 784
 785register_out:
 786                mutex_unlock(&cdev->lock);
 787                return retval;
 788
 789        case CAPI_GET_VERSION:
 790                if (copy_from_user(&data.contr, argp,
 791                                   sizeof(data.contr)))
 792                        return -EFAULT;
 793                cdev->errcode = capi20_get_version(data.contr, &data.version);
 794                if (cdev->errcode)
 795                        return -EIO;
 796                if (copy_to_user(argp, &data.version,
 797                                 sizeof(data.version)))
 798                        return -EFAULT;
 799                return 0;
 800
 801        case CAPI_GET_SERIAL:
 802                if (copy_from_user(&data.contr, argp,
 803                                   sizeof(data.contr)))
 804                        return -EFAULT;
 805                cdev->errcode = capi20_get_serial(data.contr, data.serial);
 806                if (cdev->errcode)
 807                        return -EIO;
 808                if (copy_to_user(argp, data.serial,
 809                                 sizeof(data.serial)))
 810                        return -EFAULT;
 811                return 0;
 812
 813        case CAPI_GET_PROFILE:
 814                if (copy_from_user(&data.contr, argp,
 815                                   sizeof(data.contr)))
 816                        return -EFAULT;
 817
 818                if (data.contr == 0) {
 819                        cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 820                        if (cdev->errcode)
 821                                return -EIO;
 822
 823                        retval = copy_to_user(argp,
 824                                              &data.profile.ncontroller,
 825                                              sizeof(data.profile.ncontroller));
 826
 827                } else {
 828                        cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 829                        if (cdev->errcode)
 830                                return -EIO;
 831
 832                        retval = copy_to_user(argp, &data.profile,
 833                                              sizeof(data.profile));
 834                }
 835                if (retval)
 836                        return -EFAULT;
 837                return 0;
 838
 839        case CAPI_GET_MANUFACTURER:
 840                if (copy_from_user(&data.contr, argp,
 841                                   sizeof(data.contr)))
 842                        return -EFAULT;
 843                cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 844                if (cdev->errcode)
 845                        return -EIO;
 846
 847                if (copy_to_user(argp, data.manufacturer,
 848                                 sizeof(data.manufacturer)))
 849                        return -EFAULT;
 850
 851                return 0;
 852
 853        case CAPI_GET_ERRCODE:
 854                data.errcode = cdev->errcode;
 855                cdev->errcode = CAPI_NOERROR;
 856                if (arg) {
 857                        if (copy_to_user(argp, &data.errcode,
 858                                         sizeof(data.errcode)))
 859                                return -EFAULT;
 860                }
 861                return data.errcode;
 862
 863        case CAPI_INSTALLED:
 864                if (capi20_isinstalled() == CAPI_NOERROR)
 865                        return 0;
 866                return -ENXIO;
 867
 868        case CAPI_MANUFACTURER_CMD: {
 869                struct capi_manufacturer_cmd mcmd;
 870                if (!capable(CAP_SYS_ADMIN))
 871                        return -EPERM;
 872                if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 873                        return -EFAULT;
 874                return capi20_manufacturer(mcmd.cmd, mcmd.data);
 875        }
 876        case CAPI_SET_FLAGS:
 877        case CAPI_CLR_FLAGS: {
 878                unsigned userflags;
 879
 880                if (copy_from_user(&userflags, argp, sizeof(userflags)))
 881                        return -EFAULT;
 882
 883                mutex_lock(&cdev->lock);
 884                if (cmd == CAPI_SET_FLAGS)
 885                        cdev->userflags |= userflags;
 886                else
 887                        cdev->userflags &= ~userflags;
 888                mutex_unlock(&cdev->lock);
 889                return 0;
 890        }
 891        case CAPI_GET_FLAGS:
 892                if (copy_to_user(argp, &cdev->userflags,
 893                                 sizeof(cdev->userflags)))
 894                        return -EFAULT;
 895                return 0;
 896
 897#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 898        case CAPI_NCCI_OPENCOUNT:
 899                return 0;
 900
 901#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 902        case CAPI_NCCI_OPENCOUNT: {
 903                struct capincci *nccip;
 904                unsigned ncci;
 905                int count = 0;
 906
 907                if (copy_from_user(&ncci, argp, sizeof(ncci)))
 908                        return -EFAULT;
 909
 910                mutex_lock(&cdev->lock);
 911                nccip = capincci_find(cdev, (u32)ncci);
 912                if (nccip)
 913                        count = capincci_minor_opencount(nccip);
 914                mutex_unlock(&cdev->lock);
 915                return count;
 916        }
 917
 918        case CAPI_NCCI_GETUNIT: {
 919                struct capincci *nccip;
 920                struct capiminor *mp;
 921                unsigned ncci;
 922                int unit = -ESRCH;
 923
 924                if (copy_from_user(&ncci, argp, sizeof(ncci)))
 925                        return -EFAULT;
 926
 927                mutex_lock(&cdev->lock);
 928                nccip = capincci_find(cdev, (u32)ncci);
 929                if (nccip) {
 930                        mp = nccip->minorp;
 931                        if (mp)
 932                                unit = mp->minor;
 933                }
 934                mutex_unlock(&cdev->lock);
 935                return unit;
 936        }
 937#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 938
 939        default:
 940                return -EINVAL;
 941        }
 942}
 943
 944static long
 945capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 946{
 947        int ret;
 948
 949        mutex_lock(&capi_mutex);
 950        ret = capi_ioctl(file, cmd, arg);
 951        mutex_unlock(&capi_mutex);
 952
 953        return ret;
 954}
 955
 956#ifdef CONFIG_COMPAT
 957static long
 958capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 959{
 960        int ret;
 961
 962        if (cmd == CAPI_MANUFACTURER_CMD) {
 963                struct {
 964                        compat_ulong_t cmd;
 965                        compat_uptr_t data;
 966                } mcmd32;
 967
 968                if (!capable(CAP_SYS_ADMIN))
 969                        return -EPERM;
 970                if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
 971                        return -EFAULT;
 972
 973                mutex_lock(&capi_mutex);
 974                ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
 975                mutex_unlock(&capi_mutex);
 976
 977                return ret;
 978        }
 979
 980        return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 981}
 982#endif
 983
 984static int capi_open(struct inode *inode, struct file *file)
 985{
 986        struct capidev *cdev;
 987
 988        cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 989        if (!cdev)
 990                return -ENOMEM;
 991
 992        mutex_init(&cdev->lock);
 993        skb_queue_head_init(&cdev->recvqueue);
 994        init_waitqueue_head(&cdev->recvwait);
 995        INIT_LIST_HEAD(&cdev->nccis);
 996        file->private_data = cdev;
 997
 998        mutex_lock(&capidev_list_lock);
 999        list_add_tail(&cdev->list, &capidev_list);
1000        mutex_unlock(&capidev_list_lock);
1001
1002        return stream_open(inode, file);
1003}
1004
1005static int capi_release(struct inode *inode, struct file *file)
1006{
1007        struct capidev *cdev = file->private_data;
1008
1009        mutex_lock(&capidev_list_lock);
1010        list_del(&cdev->list);
1011        mutex_unlock(&capidev_list_lock);
1012
1013        if (cdev->ap.applid)
1014                capi20_release(&cdev->ap);
1015        skb_queue_purge(&cdev->recvqueue);
1016        capincci_free(cdev, 0xffffffff);
1017
1018        kfree(cdev);
1019        return 0;
1020}
1021
1022static const struct file_operations capi_fops =
1023{
1024        .owner          = THIS_MODULE,
1025        .llseek         = no_llseek,
1026        .read           = capi_read,
1027        .write          = capi_write,
1028        .poll           = capi_poll,
1029        .unlocked_ioctl = capi_unlocked_ioctl,
1030#ifdef CONFIG_COMPAT
1031        .compat_ioctl   = capi_compat_ioctl,
1032#endif
1033        .open           = capi_open,
1034        .release        = capi_release,
1035};
1036
1037#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1038/* -------- tty_operations for capincci ----------------------------- */
1039
1040static int
1041capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1042{
1043        struct capiminor *mp = capiminor_get(tty->index);
1044        int ret = tty_standard_install(driver, tty);
1045
1046        if (ret == 0)
1047                tty->driver_data = mp;
1048        else
1049                capiminor_put(mp);
1050        return ret;
1051}
1052
1053static void capinc_tty_cleanup(struct tty_struct *tty)
1054{
1055        struct capiminor *mp = tty->driver_data;
1056        tty->driver_data = NULL;
1057        capiminor_put(mp);
1058}
1059
1060static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1061{
1062        struct capiminor *mp = tty->driver_data;
1063        int err;
1064
1065        err = tty_port_open(&mp->port, tty, filp);
1066        if (err)
1067                return err;
1068
1069        handle_minor_recv(mp);
1070        return 0;
1071}
1072
1073static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1074{
1075        struct capiminor *mp = tty->driver_data;
1076
1077        tty_port_close(&mp->port, tty, filp);
1078}
1079
1080static int capinc_tty_write(struct tty_struct *tty,
1081                            const unsigned char *buf, int count)
1082{
1083        struct capiminor *mp = tty->driver_data;
1084        struct sk_buff *skb;
1085
1086        pr_debug("capinc_tty_write(count=%d)\n", count);
1087
1088        spin_lock_bh(&mp->outlock);
1089        skb = mp->outskb;
1090        if (skb) {
1091                mp->outskb = NULL;
1092                __skb_queue_tail(&mp->outqueue, skb);
1093                mp->outbytes += skb->len;
1094        }
1095
1096        skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1097        if (!skb) {
1098                printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1099                spin_unlock_bh(&mp->outlock);
1100                return -ENOMEM;
1101        }
1102
1103        skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1104        skb_put_data(skb, buf, count);
1105
1106        __skb_queue_tail(&mp->outqueue, skb);
1107        mp->outbytes += skb->len;
1108        spin_unlock_bh(&mp->outlock);
1109
1110        handle_minor_send(mp);
1111
1112        return count;
1113}
1114
1115static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1116{
1117        struct capiminor *mp = tty->driver_data;
1118        bool invoke_send = false;
1119        struct sk_buff *skb;
1120        int ret = 1;
1121
1122        pr_debug("capinc_put_char(%u)\n", ch);
1123
1124        spin_lock_bh(&mp->outlock);
1125        skb = mp->outskb;
1126        if (skb) {
1127                if (skb_tailroom(skb) > 0) {
1128                        skb_put_u8(skb, ch);
1129                        goto unlock_out;
1130                }
1131                mp->outskb = NULL;
1132                __skb_queue_tail(&mp->outqueue, skb);
1133                mp->outbytes += skb->len;
1134                invoke_send = true;
1135        }
1136
1137        skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1138        if (skb) {
1139                skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1140                skb_put_u8(skb, ch);
1141                mp->outskb = skb;
1142        } else {
1143                printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1144                ret = 0;
1145        }
1146
1147unlock_out:
1148        spin_unlock_bh(&mp->outlock);
1149
1150        if (invoke_send)
1151                handle_minor_send(mp);
1152
1153        return ret;
1154}
1155
1156static void capinc_tty_flush_chars(struct tty_struct *tty)
1157{
1158        struct capiminor *mp = tty->driver_data;
1159        struct sk_buff *skb;
1160
1161        spin_lock_bh(&mp->outlock);
1162        skb = mp->outskb;
1163        if (skb) {
1164                mp->outskb = NULL;
1165                __skb_queue_tail(&mp->outqueue, skb);
1166                mp->outbytes += skb->len;
1167                spin_unlock_bh(&mp->outlock);
1168
1169                handle_minor_send(mp);
1170        } else
1171                spin_unlock_bh(&mp->outlock);
1172
1173        handle_minor_recv(mp);
1174}
1175
1176static unsigned int capinc_tty_write_room(struct tty_struct *tty)
1177{
1178        struct capiminor *mp = tty->driver_data;
1179        unsigned int room;
1180
1181        room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1182        room *= CAPI_MAX_BLKSIZE;
1183        pr_debug("capinc_tty_write_room = %u\n", room);
1184        return room;
1185}
1186
1187static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1188{
1189        struct capiminor *mp = tty->driver_data;
1190
1191        pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1192                 mp->outbytes, mp->nack,
1193                 skb_queue_len(&mp->outqueue),
1194                 skb_queue_len(&mp->inqueue));
1195        return mp->outbytes;
1196}
1197
1198static void capinc_tty_throttle(struct tty_struct *tty)
1199{
1200        struct capiminor *mp = tty->driver_data;
1201        mp->ttyinstop = 1;
1202}
1203
1204static void capinc_tty_unthrottle(struct tty_struct *tty)
1205{
1206        struct capiminor *mp = tty->driver_data;
1207
1208        mp->ttyinstop = 0;
1209        handle_minor_recv(mp);
1210}
1211
1212static void capinc_tty_stop(struct tty_struct *tty)
1213{
1214        struct capiminor *mp = tty->driver_data;
1215
1216        mp->ttyoutstop = 1;
1217}
1218
1219static void capinc_tty_start(struct tty_struct *tty)
1220{
1221        struct capiminor *mp = tty->driver_data;
1222
1223        mp->ttyoutstop = 0;
1224        handle_minor_send(mp);
1225}
1226
1227static void capinc_tty_hangup(struct tty_struct *tty)
1228{
1229        struct capiminor *mp = tty->driver_data;
1230
1231        tty_port_hangup(&mp->port);
1232}
1233
1234static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1235{
1236        pr_debug("capinc_tty_send_xchar(%d)\n", ch);
1237}
1238
1239static const struct tty_operations capinc_ops = {
1240        .open = capinc_tty_open,
1241        .close = capinc_tty_close,
1242        .write = capinc_tty_write,
1243        .put_char = capinc_tty_put_char,
1244        .flush_chars = capinc_tty_flush_chars,
1245        .write_room = capinc_tty_write_room,
1246        .chars_in_buffer = capinc_tty_chars_in_buffer,
1247        .throttle = capinc_tty_throttle,
1248        .unthrottle = capinc_tty_unthrottle,
1249        .stop = capinc_tty_stop,
1250        .start = capinc_tty_start,
1251        .hangup = capinc_tty_hangup,
1252        .send_xchar = capinc_tty_send_xchar,
1253        .install = capinc_tty_install,
1254        .cleanup = capinc_tty_cleanup,
1255};
1256
1257static int __init capinc_tty_init(void)
1258{
1259        struct tty_driver *drv;
1260        int err;
1261
1262        if (capi_ttyminors > CAPINC_MAX_PORTS)
1263                capi_ttyminors = CAPINC_MAX_PORTS;
1264        if (capi_ttyminors <= 0)
1265                capi_ttyminors = CAPINC_NR_PORTS;
1266
1267        capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1268                             GFP_KERNEL);
1269        if (!capiminors)
1270                return -ENOMEM;
1271
1272        drv = alloc_tty_driver(capi_ttyminors);
1273        if (!drv) {
1274                kfree(capiminors);
1275                return -ENOMEM;
1276        }
1277        drv->driver_name = "capi_nc";
1278        drv->name = "capi!";
1279        drv->major = 0;
1280        drv->minor_start = 0;
1281        drv->type = TTY_DRIVER_TYPE_SERIAL;
1282        drv->subtype = SERIAL_TYPE_NORMAL;
1283        drv->init_termios = tty_std_termios;
1284        drv->init_termios.c_iflag = ICRNL;
1285        drv->init_termios.c_oflag = OPOST | ONLCR;
1286        drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1287        drv->init_termios.c_lflag = 0;
1288        drv->flags =
1289                TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1290                TTY_DRIVER_DYNAMIC_DEV;
1291        tty_set_operations(drv, &capinc_ops);
1292
1293        err = tty_register_driver(drv);
1294        if (err) {
1295                put_tty_driver(drv);
1296                kfree(capiminors);
1297                printk(KERN_ERR "Couldn't register capi_nc driver\n");
1298                return err;
1299        }
1300        capinc_tty_driver = drv;
1301        return 0;
1302}
1303
1304static void __exit capinc_tty_exit(void)
1305{
1306        tty_unregister_driver(capinc_tty_driver);
1307        put_tty_driver(capinc_tty_driver);
1308        kfree(capiminors);
1309}
1310
1311#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1312
1313static inline int capinc_tty_init(void)
1314{
1315        return 0;
1316}
1317
1318static inline void capinc_tty_exit(void) { }
1319
1320#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1321
1322/* -------- /proc functions ----------------------------------------- */
1323
1324/*
1325 * /proc/capi/capi20:
1326 *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1327 */
1328static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1329{
1330        struct capidev *cdev;
1331        struct list_head *l;
1332
1333        mutex_lock(&capidev_list_lock);
1334        list_for_each(l, &capidev_list) {
1335                cdev = list_entry(l, struct capidev, list);
1336                seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1337                           cdev->ap.applid,
1338                           cdev->ap.nrecvctlpkt,
1339                           cdev->ap.nrecvdatapkt,
1340                           cdev->ap.nsentctlpkt,
1341                           cdev->ap.nsentdatapkt);
1342        }
1343        mutex_unlock(&capidev_list_lock);
1344        return 0;
1345}
1346
1347/*
1348 * /proc/capi/capi20ncci:
1349 *  applid ncci
1350 */
1351static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1352{
1353        struct capidev *cdev;
1354        struct capincci *np;
1355
1356        mutex_lock(&capidev_list_lock);
1357        list_for_each_entry(cdev, &capidev_list, list) {
1358                mutex_lock(&cdev->lock);
1359                list_for_each_entry(np, &cdev->nccis, list)
1360                        seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1361                mutex_unlock(&cdev->lock);
1362        }
1363        mutex_unlock(&capidev_list_lock);
1364        return 0;
1365}
1366
1367static void __init proc_init(void)
1368{
1369        proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1370        proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1371}
1372
1373static void __exit proc_exit(void)
1374{
1375        remove_proc_entry("capi/capi20", NULL);
1376        remove_proc_entry("capi/capi20ncci", NULL);
1377}
1378
1379/* -------- init function and module interface ---------------------- */
1380
1381
1382static int __init capi_init(void)
1383{
1384        const char *compileinfo;
1385        int major_ret;
1386        int ret;
1387
1388        ret = kcapi_init();
1389        if (ret)
1390                return ret;
1391
1392        major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1393        if (major_ret < 0) {
1394                printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1395                kcapi_exit();
1396                return major_ret;
1397        }
1398        capi_class = class_create(THIS_MODULE, "capi");
1399        if (IS_ERR(capi_class)) {
1400                unregister_chrdev(capi_major, "capi20");
1401                kcapi_exit();
1402                return PTR_ERR(capi_class);
1403        }
1404
1405        device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1406
1407        if (capinc_tty_init() < 0) {
1408                device_destroy(capi_class, MKDEV(capi_major, 0));
1409                class_destroy(capi_class);
1410                unregister_chrdev(capi_major, "capi20");
1411                kcapi_exit();
1412                return -ENOMEM;
1413        }
1414
1415        proc_init();
1416
1417#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1418        compileinfo = " (middleware)";
1419#else
1420        compileinfo = " (no middleware)";
1421#endif
1422        printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1423               capi_major, compileinfo);
1424
1425        return 0;
1426}
1427
1428static void __exit capi_exit(void)
1429{
1430        proc_exit();
1431
1432        device_destroy(capi_class, MKDEV(capi_major, 0));
1433        class_destroy(capi_class);
1434        unregister_chrdev(capi_major, "capi20");
1435
1436        capinc_tty_exit();
1437
1438        kcapi_exit();
1439}
1440
1441module_init(capi_init);
1442module_exit(capi_exit);
1443