drivers/staging/i4l/pcbit/drv.c

   1 /*
   2  * PCBIT-D interface with isdn4linux
   3  *
   4  * Copyright (C) 1996 Universidade de Lisboa
   5  *
   6  * Written by Pedro Roque Marques (roque@di.fc.ul.pt)
   7  *
   8  * This software may be used and distributed according to the terms of
   9  * the GNU General Public License, incorporated herein by reference.
  10  */
  11
  12 /*
  13  *      Fixes:
  14  *
  15  *      Nuno Grilo      <l38486@alfa.ist.utl.pt>
  16  *      fixed msn_list NULL pointer dereference.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21
  22
  23 #include <linux/kernel.h>
  24
  25 #include <linux/types.h>
  26 #include <linux/sched.h>
  27 #include <linux/slab.h>
  28 #include <linux/mm.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/string.h>
  31 #include <linux/skbuff.h>
  32
  33 #include <linux/isdnif.h>
  34 #include <asm/string.h>
  35 #include <asm/io.h>
  36 #include <linux/ioport.h>
  37
  38 #include "pcbit.h"
  39 #include "edss1.h"
  40 #include "layer2.h"
  41 #include "capi.h"
  42
  43
  44 extern ushort last_ref_num;
  45
  46 static int pcbit_ioctl(isdn_ctrl *ctl);
  47
  48 static char *pcbit_devname[MAX_PCBIT_CARDS] = {
  49         "pcbit0",
  50         "pcbit1",
  51         "pcbit2",
  52         "pcbit3"
  53 };
  54
  55 /*
  56  * prototypes
  57  */
  58
  59 static int pcbit_command(isdn_ctrl *ctl);
  60 static int pcbit_stat(u_char __user *buf, int len, int, int);
  61 static int pcbit_xmit(int driver, int chan, int ack, struct sk_buff *skb);
  62 static int pcbit_writecmd(const u_char __user *, int, int, int);
  63
  64 static int set_protocol_running(struct pcbit_dev *dev);
  65
  66 static void pcbit_clear_msn(struct pcbit_dev *dev);
  67 static void pcbit_set_msn(struct pcbit_dev *dev, char *list);
  68 static int pcbit_check_msn(struct pcbit_dev *dev, char *msn);
  69
  70
  71 int pcbit_init_dev(int board, int mem_base, int irq)
  72 {
  73         struct pcbit_dev *dev;
  74         isdn_if *dev_if;
  75
  76         if ((dev = kzalloc(sizeof(struct pcbit_dev), GFP_KERNEL)) == NULL)
  77         {
  78                 printk("pcbit_init: couldn't malloc pcbit_dev struct\n");
  79                 return -ENOMEM;
  80         }
  81
  82         dev_pcbit[board] = dev;
  83         init_waitqueue_head(&dev->set_running_wq);
  84         spin_lock_init(&dev->lock);
  85
  86         if (mem_base >= 0xA0000 && mem_base <= 0xFFFFF) {
  87                 dev->ph_mem = mem_base;
  88                 if (!request_mem_region(dev->ph_mem, 4096, "PCBIT mem")) {
  89                         printk(KERN_WARNING
  90                                "PCBIT: memory region %lx-%lx already in use\n",
  91                                dev->ph_mem, dev->ph_mem + 4096);
  92                         kfree(dev);
  93                         dev_pcbit[board] = NULL;
  94                         return -EACCES;
  95                 }
  96                 dev->sh_mem = ioremap(dev->ph_mem, 4096);
  97         }
  98         else
  99         {
 100                 printk("memory address invalid");
 101                 kfree(dev);
 102                 dev_pcbit[board] = NULL;
 103                 return -EACCES;
 104         }
 105
 106         dev->b1 = kzalloc(sizeof(struct pcbit_chan), GFP_KERNEL);
 107         if (!dev->b1) {
 108                 printk("pcbit_init: couldn't malloc pcbit_chan struct\n");
 109                 iounmap(dev->sh_mem);
 110                 release_mem_region(dev->ph_mem, 4096);
 111                 kfree(dev);
 112                 return -ENOMEM;
 113         }
 114
 115         dev->b2 = kzalloc(sizeof(struct pcbit_chan), GFP_KERNEL);
 116         if (!dev->b2) {
 117                 printk("pcbit_init: couldn't malloc pcbit_chan struct\n");
 118                 kfree(dev->b1);
 119                 iounmap(dev->sh_mem);
 120                 release_mem_region(dev->ph_mem, 4096);
 121                 kfree(dev);
 122                 return -ENOMEM;
 123         }
 124
 125         dev->b2->id = 1;
 126
 127         INIT_WORK(&dev->qdelivery, pcbit_deliver);
 128
 129         /*
 130          *  interrupts
 131          */
 132
 133         if (request_irq(irq, &pcbit_irq_handler, 0, pcbit_devname[board], dev) != 0)
 134         {
 135                 kfree(dev->b1);
 136                 kfree(dev->b2);
 137                 iounmap(dev->sh_mem);
 138                 release_mem_region(dev->ph_mem, 4096);
 139                 kfree(dev);
 140                 dev_pcbit[board] = NULL;
 141                 return -EIO;
 142         }
 143
 144         dev->irq = irq;
 145
 146         /* next frame to be received */
 147         dev->rcv_seq = 0;
 148         dev->send_seq = 0;
 149         dev->unack_seq = 0;
 150
 151         dev->hl_hdrlen = 16;
 152
 153         dev_if = kmalloc(sizeof(isdn_if), GFP_KERNEL);
 154
 155         if (!dev_if) {
 156                 free_irq(irq, dev);
 157                 kfree(dev->b1);
 158                 kfree(dev->b2);
 159                 iounmap(dev->sh_mem);
 160                 release_mem_region(dev->ph_mem, 4096);
 161                 kfree(dev);
 162                 dev_pcbit[board] = NULL;
 163                 return -EIO;
 164         }
 165
 166         dev->dev_if = dev_if;
 167
 168         dev_if->owner = THIS_MODULE;
 169
 170         dev_if->channels = 2;
 171
 172         dev_if->features = (ISDN_FEATURE_P_EURO  | ISDN_FEATURE_L3_TRANS |
 173                             ISDN_FEATURE_L2_HDLC | ISDN_FEATURE_L2_TRANS);
 174
 175         dev_if->writebuf_skb = pcbit_xmit;
 176         dev_if->hl_hdrlen = 16;
 177
 178         dev_if->maxbufsize = MAXBUFSIZE;
 179         dev_if->command  = pcbit_command;
 180
 181         dev_if->writecmd = pcbit_writecmd;
 182         dev_if->readstat = pcbit_stat;
 183
 184
 185         strcpy(dev_if->id, pcbit_devname[board]);
 186
 187         if (!register_isdn(dev_if)) {
 188                 free_irq(irq, dev);
 189                 kfree(dev->b1);
 190                 kfree(dev->b2);
 191                 iounmap(dev->sh_mem);
 192                 release_mem_region(dev->ph_mem, 4096);
 193                 kfree(dev);
 194                 dev_pcbit[board] = NULL;
 195                 return -EIO;
 196         }
 197
 198         dev->id = dev_if->channels;
 199
 200
 201         dev->l2_state = L2_DOWN;
 202         dev->free = 511;
 203
 204         /*
 205          * set_protocol_running(dev);
 206          */
 207
 208         return 0;
 209 }
 210
 211 #ifdef MODULE
 212 void pcbit_terminate(int board)
 213 {
 214         struct pcbit_dev *dev;
 215
 216         dev = dev_pcbit[board];
 217
 218         if (dev) {
 219                 /* unregister_isdn(dev->dev_if); */
 220                 free_irq(dev->irq, dev);
 221                 pcbit_clear_msn(dev);
 222                 kfree(dev->dev_if);
 223                 if (dev->b1->fsm_timer.function)
 224                         del_timer(&dev->b1->fsm_timer);
 225                 if (dev->b2->fsm_timer.function)
 226                         del_timer(&dev->b2->fsm_timer);
 227                 kfree(dev->b1);
 228                 kfree(dev->b2);
 229                 iounmap(dev->sh_mem);
 230                 release_mem_region(dev->ph_mem, 4096);
 231                 kfree(dev);
 232         }
 233 }
 234 #endif
 235
 236 static int pcbit_command(isdn_ctrl *ctl)
 237 {
 238         struct pcbit_dev *dev;
 239         struct pcbit_chan *chan;
 240         struct callb_data info;
 241
 242         dev = finddev(ctl->driver);
 243
 244         if (!dev)
 245         {
 246                 printk("pcbit_command: unknown device\n");
 247                 return -1;
 248         }
 249
 250         chan = (ctl->arg & 0x0F) ? dev->b2 : dev->b1;
 251
 252
 253         switch (ctl->command) {
 254         case ISDN_CMD_IOCTL:
 255                 return pcbit_ioctl(ctl);
 256                 break;
 257         case ISDN_CMD_DIAL:
 258                 info.type = EV_USR_SETUP_REQ;
 259                 info.data.setup.CalledPN = (char *) &ctl->parm.setup.phone;
 260                 pcbit_fsm_event(dev, chan, EV_USR_SETUP_REQ, &info);
 261                 break;
 262         case ISDN_CMD_ACCEPTD:
 263                 pcbit_fsm_event(dev, chan, EV_USR_SETUP_RESP, NULL);
 264                 break;
 265         case ISDN_CMD_ACCEPTB:
 266                 printk("ISDN_CMD_ACCEPTB - not really needed\n");
 267                 break;
 268         case ISDN_CMD_HANGUP:
 269                 pcbit_fsm_event(dev, chan, EV_USR_RELEASE_REQ, NULL);
 270                 break;
 271         case ISDN_CMD_SETL2:
 272                 chan->proto = (ctl->arg >> 8);
 273                 break;
 274         case ISDN_CMD_CLREAZ:
 275                 pcbit_clear_msn(dev);
 276                 break;
 277         case ISDN_CMD_SETEAZ:
 278                 pcbit_set_msn(dev, ctl->parm.num);
 279                 break;
 280         case ISDN_CMD_SETL3:
 281                 if ((ctl->arg >> 8) != ISDN_PROTO_L3_TRANS)
 282                         printk(KERN_DEBUG "L3 protocol unknown\n");
 283                 break;
 284         default:
 285                 printk(KERN_DEBUG "pcbit_command: unknown command\n");
 286                 break;
 287         }
 288
 289         return 0;
 290 }
 291
 292 /*
 293  * Another Hack :-(
 294  * on some conditions the board stops sending TDATA_CONFs
 295  * let's see if we can turn around the problem
 296  */
 297
 298 #ifdef BLOCK_TIMER
 299 static void pcbit_block_timer(unsigned long data)
 300 {
 301         struct pcbit_chan *chan;
 302         struct pcbit_dev *dev;
 303         isdn_ctrl ictl;
 304
 305         chan = (struct pcbit_chan *)data;
 306
 307         dev = chan2dev(chan);
 308
 309         if (dev == NULL) {
 310                 printk(KERN_DEBUG "pcbit: chan2dev failed\n");
 311                 return;
 312         }
 313
 314         del_timer(&chan->block_timer);
 315         chan->block_timer.function = NULL;
 316
 317 #ifdef DEBUG
 318         printk(KERN_DEBUG "pcbit_block_timer\n");
 319 #endif
 320         chan->queued = 0;
 321         ictl.driver = dev->id;
 322         ictl.command = ISDN_STAT_BSENT;
 323         ictl.arg = chan->id;
 324         dev->dev_if->statcallb(&ictl);
 325 }
 326 #endif
 327
 328 static int pcbit_xmit(int driver, int chnum, int ack, struct sk_buff *skb)
 329 {
 330         ushort hdrlen;
 331         int refnum, len;
 332         struct pcbit_chan *chan;
 333         struct pcbit_dev *dev;
 334
 335         dev = finddev(driver);
 336         if (dev == NULL)
 337         {
 338                 printk("finddev returned NULL");
 339                 return -1;
 340         }
 341
 342         chan = chnum ? dev->b2 : dev->b1;
 343
 344
 345         if (chan->fsm_state != ST_ACTIVE)
 346                 return -1;
 347
 348         if (chan->queued >= MAX_QUEUED)
 349         {
 350 #ifdef DEBUG_QUEUE
 351                 printk(KERN_DEBUG
 352                        "pcbit: %d packets already in queue - write fails\n",
 353                        chan->queued);
 354 #endif
 355                 /*
 356                  * packet stays on the head of the device queue
 357                  * since dev_start_xmit will fail
 358                  * see net/core/dev.c
 359                  */
 360 #ifdef BLOCK_TIMER
 361                 if (chan->block_timer.function == NULL) {
 362                         setup_timer(&chan->block_timer, &pcbit_block_timer,
 363                                     (long)chan);
 364                         mod_timer(&chan->block_timer, jiffies + 1 * HZ);
 365                 }
 366 #endif
 367                 return 0;
 368         }
 369
 370
 371         chan->queued++;
 372
 373         len = skb->len;
 374
 375         hdrlen = capi_tdata_req(chan, skb);
 376
 377         refnum = last_ref_num++ & 0x7fffU;
 378         chan->s_refnum = refnum;
 379
 380         pcbit_l2_write(dev, MSG_TDATA_REQ, refnum, skb, hdrlen);
 381
 382         return len;
 383 }
 384
 385 static int pcbit_writecmd(const u_char __user *buf, int len, int driver, int channel)
 386 {
 387         struct pcbit_dev *dev;
 388         int i, j;
 389         const u_char *loadbuf;
 390         u_char *ptr = NULL;
 391         u_char *cbuf;
 392
 393         int errstat;
 394
 395         dev = finddev(driver);
 396
 397         if (!dev)
 398         {
 399                 printk("pcbit_writecmd: couldn't find device");
 400                 return -ENODEV;
 401         }
 402
 403         switch (dev->l2_state) {
 404         case L2_LWMODE:
 405                 /* check (size <= rdp_size); write buf into board */
 406                 if (len < 0 || len > BANK4 + 1 || len > 1024)
 407                 {
 408                         printk("pcbit_writecmd: invalid length %d\n", len);
 409                         return -EINVAL;
 410                 }
 411
 412                 cbuf = memdup_user(buf, len);
 413                 if (IS_ERR(cbuf))
 414                         return PTR_ERR(cbuf);
 415
 416                 memcpy_toio(dev->sh_mem, cbuf, len);
 417                 kfree(cbuf);
 418                 return len;
 419         case L2_FWMODE:
 420                 /* this is the hard part */
 421                 /* dumb board */
 422                 /* get it into kernel space */
 423                 if ((ptr = kmalloc(len, GFP_KERNEL)) == NULL)
 424                         return -ENOMEM;
 425                 if (copy_from_user(ptr, buf, len)) {
 426                         kfree(ptr);
 427                         return -EFAULT;
 428                 }
 429                 loadbuf = ptr;
 430
 431                 errstat = 0;
 432
 433                 for (i = 0; i < len; i++)
 434                 {
 435                         for (j = 0; j < LOAD_RETRY; j++)
 436                                 if (!(readb(dev->sh_mem + dev->loadptr)))
 437                                         break;
 438
 439                         if (j == LOAD_RETRY)
 440                         {
 441                                 errstat = -ETIME;
 442                                 printk("TIMEOUT i=%d\n", i);
 443                                 break;
 444                         }
 445                         writeb(loadbuf[i], dev->sh_mem + dev->loadptr + 1);
 446                         writeb(0x01, dev->sh_mem + dev->loadptr);
 447
 448                         dev->loadptr += 2;
 449                         if (dev->loadptr > LOAD_ZONE_END)
 450                                 dev->loadptr = LOAD_ZONE_START;
 451                 }
 452                 kfree(ptr);
 453
 454                 return errstat ? errstat : len;
 455         default:
 456                 return -EBUSY;
 457         }
 458 }
 459
 460 /*
 461  *  demultiplexing of messages
 462  *
 463  */
 464
 465 void pcbit_l3_receive(struct pcbit_dev *dev, ulong msg,
 466                       struct sk_buff *skb,
 467                       ushort hdr_len, ushort refnum)
 468 {
 469         struct pcbit_chan *chan;
 470         struct sk_buff *skb2;
 471         unsigned short len;
 472         struct callb_data cbdata;
 473         int complete, err;
 474         isdn_ctrl ictl;
 475
 476         switch (msg) {
 477
 478         case MSG_TDATA_IND:
 479                 if (!(chan = capi_channel(dev, skb))) {
 480                         printk(KERN_WARNING
 481                                "CAPI header: unknown channel id\n");
 482                         break;
 483                 }
 484                 chan->r_refnum = skb->data[7];
 485                 skb_pull(skb, 8);
 486
 487                 dev->dev_if->rcvcallb_skb(dev->id, chan->id, skb);
 488
 489                 if (capi_tdata_resp(chan, &skb2) > 0)
 490                         pcbit_l2_write(dev, MSG_TDATA_RESP, refnum,
 491                                        skb2, skb2->len);
 492                 return;
 493                 break;
 494         case MSG_TDATA_CONF:
 495                 if (!(chan = capi_channel(dev, skb))) {
 496                         printk(KERN_WARNING
 497                                "CAPI header: unknown channel id\n");
 498                         break;
 499                 }
 500
 501 #ifdef DEBUG
 502                 if ((*((ushort *)(skb->data + 2))) != 0) {
 503                         printk(KERN_DEBUG "TDATA_CONF error\n");
 504                 }
 505 #endif
 506 #ifdef BLOCK_TIMER
 507                 if (chan->queued == MAX_QUEUED) {
 508                         del_timer(&chan->block_timer);
 509                         chan->block_timer.function = NULL;
 510                 }
 511
 512 #endif
 513                 chan->queued--;
 514
 515                 ictl.driver = dev->id;
 516                 ictl.command = ISDN_STAT_BSENT;
 517                 ictl.arg = chan->id;
 518                 dev->dev_if->statcallb(&ictl);
 519                 break;
 520
 521         case MSG_CONN_IND:
 522                 /*
 523                  *  channel: 1st not used will do
 524                  *           if both are used we're in trouble
 525                  */
 526
 527                 if (!dev->b1->fsm_state)
 528                         chan = dev->b1;
 529                 else if (!dev->b2->fsm_state)
 530                         chan = dev->b2;
 531                 else {
 532                         printk(KERN_INFO
 533                                "Incoming connection: no channels available");
 534
 535                         if ((len = capi_disc_req(*(ushort *)(skb->data), &skb2, CAUSE_NOCHAN)) > 0)
 536                                 pcbit_l2_write(dev, MSG_DISC_REQ, refnum, skb2, len);
 537                         break;
 538                 }
 539
 540                 cbdata.data.setup.CalledPN = NULL;
 541                 cbdata.data.setup.CallingPN = NULL;
 542
 543                 capi_decode_conn_ind(chan, skb, &cbdata);
 544                 cbdata.type = EV_NET_SETUP;
 545
 546                 pcbit_fsm_event(dev, chan, EV_NET_SETUP, NULL);
 547
 548                 if (pcbit_check_msn(dev, cbdata.data.setup.CallingPN))
 549                         pcbit_fsm_event(dev, chan, EV_USR_PROCED_REQ, &cbdata);
 550                 else
 551                         pcbit_fsm_event(dev, chan, EV_USR_RELEASE_REQ, NULL);
 552
 553                 kfree(cbdata.data.setup.CalledPN);
 554                 kfree(cbdata.data.setup.CallingPN);
 555                 break;
 556
 557         case MSG_CONN_CONF:
 558                 /*
 559                  * We should be able to find the channel by the message
 560                  * reference number. The current version of the firmware
 561                  * doesn't sent the ref number correctly.
 562                  */
 563 #ifdef DEBUG
 564                 printk(KERN_DEBUG "refnum=%04x b1=%04x b2=%04x\n", refnum,
 565                        dev->b1->s_refnum,
 566                        dev->b2->s_refnum);
 567 #endif
 568                 /* We just try to find a channel in the right state */
 569
 570                 if (dev->b1->fsm_state == ST_CALL_INIT)
 571                         chan = dev->b1;
 572                 else {
 573                         if (dev->b2->s_refnum == ST_CALL_INIT)
 574                                 chan = dev->b2;
 575                         else {
 576                                 chan = NULL;
 577                                 printk(KERN_WARNING "Connection Confirm - no channel in Call Init state\n");
 578                                 break;
 579                         }
 580                 }
 581                 if (capi_decode_conn_conf(chan, skb, &complete)) {
 582                         printk(KERN_DEBUG "conn_conf indicates error\n");
 583                         pcbit_fsm_event(dev, chan, EV_ERROR, NULL);
 584                 }
 585                 else
 586                         if (complete)
 587                                 pcbit_fsm_event(dev, chan, EV_NET_CALL_PROC, NULL);
 588                         else
 589                                 pcbit_fsm_event(dev, chan, EV_NET_SETUP_ACK, NULL);
 590                 break;
 591         case MSG_CONN_ACTV_IND:
 592
 593                 if (!(chan = capi_channel(dev, skb))) {
 594                         printk(KERN_WARNING
 595                                "CAPI header: unknown channel id\n");
 596                         break;
 597                 }
 598
 599                 if (capi_decode_conn_actv_ind(chan, skb)) {
 600                         printk("error in capi_decode_conn_actv_ind\n");
 601                         /* pcbit_fsm_event(dev, chan, EV_ERROR, NULL); */
 602                         break;
 603                 }
 604                 chan->r_refnum = refnum;
 605                 pcbit_fsm_event(dev, chan, EV_NET_CONN, NULL);
 606                 break;
 607         case MSG_CONN_ACTV_CONF:
 608
 609                 if (!(chan = capi_channel(dev, skb))) {
 610                         printk(KERN_WARNING
 611                                "CAPI header: unknown channel id\n");
 612                         break;
 613                 }
 614
 615                 if (capi_decode_conn_actv_conf(chan, skb) == 0)
 616                         pcbit_fsm_event(dev, chan, EV_NET_CONN_ACK, NULL);
 617
 618                 else
 619                         printk(KERN_DEBUG "decode_conn_actv_conf failed\n");
 620                 break;
 621
 622         case  MSG_SELP_CONF:
 623
 624                 if (!(chan = capi_channel(dev, skb))) {
 625                         printk(KERN_WARNING
 626                                "CAPI header: unknown channel id\n");
 627                         break;
 628                 }
 629
 630                 if (!(err = capi_decode_sel_proto_conf(chan, skb)))
 631                         pcbit_fsm_event(dev, chan, EV_NET_SELP_RESP, NULL);
 632                 else {
 633                         /* Error */
 634                         printk("error %d - capi_decode_sel_proto_conf\n", err);
 635                 }
 636                 break;
 637         case MSG_ACT_TRANSP_CONF:
 638                 if (!(chan = capi_channel(dev, skb))) {
 639                         printk(KERN_WARNING
 640                                "CAPI header: unknown channel id\n");
 641                         break;
 642                 }
 643
 644                 if (!capi_decode_actv_trans_conf(chan, skb))
 645                         pcbit_fsm_event(dev, chan, EV_NET_ACTV_RESP, NULL);
 646                 break;
 647
 648         case MSG_DISC_IND:
 649
 650                 if (!(chan = capi_channel(dev, skb))) {
 651                         printk(KERN_WARNING
 652                                "CAPI header: unknown channel id\n");
 653                         break;
 654                 }
 655
 656                 if (!capi_decode_disc_ind(chan, skb))
 657                         pcbit_fsm_event(dev, chan, EV_NET_DISC, NULL);
 658                 else
 659                         printk(KERN_WARNING "capi_decode_disc_ind - error\n");
 660                 break;
 661         case MSG_DISC_CONF:
 662                 if (!(chan = capi_channel(dev, skb))) {
 663                         printk(KERN_WARNING
 664                                "CAPI header: unknown channel id\n");
 665                         break;
 666                 }
 667
 668                 if (!capi_decode_disc_ind(chan, skb))
 669                         pcbit_fsm_event(dev, chan, EV_NET_RELEASE, NULL);
 670                 else
 671                         printk(KERN_WARNING "capi_decode_disc_conf - error\n");
 672                 break;
 673         case MSG_INFO_IND:
 674 #ifdef DEBUG
 675                 printk(KERN_DEBUG "received Info Indication - discarded\n");
 676 #endif
 677                 break;
 678 #ifdef DEBUG
 679         case MSG_DEBUG_188:
 680                 capi_decode_debug_188(skb->data, skb->len);
 681                 break;
 682
 683         default:
 684                 printk(KERN_DEBUG "pcbit_l3_receive: unknown message %08lx\n",
 685                        msg);
 686                 break;
 687 #endif
 688         }
 689
 690         kfree_skb(skb);
 691
 692 }
 693
 694 /*
 695  *   Single statbuf
 696  *   should be a statbuf per device
 697  */
 698
 699 static char statbuf[STATBUF_LEN];
 700 static int stat_st;
 701 static int stat_end;
 702
 703 static int pcbit_stat(u_char __user *buf, int len, int driver, int channel)
 704 {
 705         int stat_count;
 706         stat_count = stat_end - stat_st;
 707
 708         if (stat_count < 0)
 709                 stat_count = STATBUF_LEN - stat_st + stat_end;
 710
 711         /* FIXME: should we sleep and wait for more cookies ? */
 712         if (len > stat_count)
 713                 len = stat_count;
 714
 715         if (stat_st < stat_end)
 716         {
 717                 if (copy_to_user(buf, statbuf + stat_st, len))
 718                         return -EFAULT;
 719                 stat_st += len;
 720         }
 721         else
 722         {
 723                 if (len > STATBUF_LEN - stat_st)
 724                 {
 725                         if (copy_to_user(buf, statbuf + stat_st,
 726                                          STATBUF_LEN - stat_st))
 727                                 return -EFAULT;
 728                         if (copy_to_user(buf, statbuf,
 729                                          len - (STATBUF_LEN - stat_st)))
 730                                 return -EFAULT;
 731
 732                         stat_st = len - (STATBUF_LEN - stat_st);
 733                 }
 734                 else
 735                 {
 736                         if (copy_to_user(buf, statbuf + stat_st, len))
 737                                 return -EFAULT;
 738
 739                         stat_st += len;
 740
 741                         if (stat_st == STATBUF_LEN)
 742                                 stat_st = 0;
 743                 }
 744         }
 745
 746         if (stat_st == stat_end)
 747                 stat_st = stat_end = 0;
 748
 749         return len;
 750 }
 751
 752 static void pcbit_logstat(struct pcbit_dev *dev, char *str)
 753 {
 754         int i;
 755         isdn_ctrl ictl;
 756
 757         for (i = stat_end; i < strlen(str); i++)
 758         {
 759                 statbuf[i] = str[i];
 760                 stat_end = (stat_end + 1) % STATBUF_LEN;
 761                 if (stat_end == stat_st)
 762                         stat_st = (stat_st + 1) % STATBUF_LEN;
 763         }
 764
 765         ictl.command = ISDN_STAT_STAVAIL;
 766         ictl.driver = dev->id;
 767         ictl.arg = strlen(str);
 768         dev->dev_if->statcallb(&ictl);
 769 }
 770
 771 void pcbit_state_change(struct pcbit_dev *dev, struct pcbit_chan *chan,
 772                         unsigned short i, unsigned short ev, unsigned short f)
 773 {
 774         char buf[256];
 775
 776         sprintf(buf, "change on device: %d channel:%d\n%s -> %s -> %s\n",
 777                 dev->id, chan->id,
 778                 isdn_state_table[i], strisdnevent(ev), isdn_state_table[f]
 779                 );
 780
 781 #ifdef DEBUG
 782         printk("%s", buf);
 783 #endif
 784
 785         pcbit_logstat(dev, buf);
 786 }
 787
 788 static void set_running_timeout(unsigned long ptr)
 789 {
 790         struct pcbit_dev *dev;
 791
 792 #ifdef DEBUG
 793         printk(KERN_DEBUG "set_running_timeout\n");
 794 #endif
 795         dev = (struct pcbit_dev *) ptr;
 796
 797         dev->l2_state = L2_DOWN;
 798         wake_up_interruptible(&dev->set_running_wq);
 799 }
 800
 801 static int set_protocol_running(struct pcbit_dev *dev)
 802 {
 803         isdn_ctrl ctl;
 804
 805         setup_timer(&dev->set_running_timer, &set_running_timeout, (ulong)dev);
 806
 807         /* kick it */
 808
 809         dev->l2_state = L2_STARTING;
 810
 811         writeb((0x80U | ((dev->rcv_seq & 0x07) << 3) | (dev->send_seq & 0x07)),
 812                dev->sh_mem + BANK4);
 813
 814         mod_timer(&dev->set_running_timer, jiffies + SET_RUN_TIMEOUT);
 815
 816         wait_event(dev->set_running_wq, dev->l2_state == L2_RUNNING ||
 817                                         dev->l2_state == L2_DOWN);
 818
 819         del_timer(&dev->set_running_timer);
 820
 821         if (dev->l2_state == L2_RUNNING)
 822         {
 823                 printk(KERN_DEBUG "pcbit: running\n");
 824
 825                 dev->unack_seq = dev->send_seq;
 826
 827                 dev->writeptr = dev->sh_mem;
 828                 dev->readptr = dev->sh_mem + BANK2;
 829
 830                 /* tell the good news to the upper layer */
 831                 ctl.driver = dev->id;
 832                 ctl.command = ISDN_STAT_RUN;
 833
 834                 dev->dev_if->statcallb(&ctl);
 835         }
 836         else
 837         {
 838                 printk(KERN_DEBUG "pcbit: initialization failed\n");
 839                 printk(KERN_DEBUG "pcbit: firmware not loaded\n");
 840
 841 #ifdef DEBUG
 842                 printk(KERN_DEBUG "Bank3 = %02x\n",
 843                        readb(dev->sh_mem + BANK3));
 844 #endif
 845                 writeb(0x40, dev->sh_mem + BANK4);
 846
 847                 /* warn the upper layer */
 848                 ctl.driver = dev->id;
 849                 ctl.command = ISDN_STAT_STOP;
 850
 851                 dev->dev_if->statcallb(&ctl);
 852
 853                 return -EL2HLT; /* Level 2 halted */
 854         }
 855
 856         return 0;
 857 }
 858
 859 static int pcbit_ioctl(isdn_ctrl *ctl)
 860 {
 861         struct pcbit_dev *dev;
 862         struct pcbit_ioctl *cmd;
 863
 864         dev = finddev(ctl->driver);
 865
 866         if (!dev)
 867         {
 868                 printk(KERN_DEBUG "pcbit_ioctl: unknown device\n");
 869                 return -ENODEV;
 870         }
 871
 872         cmd = (struct pcbit_ioctl *) ctl->parm.num;
 873
 874         switch (ctl->arg) {
 875         case PCBIT_IOCTL_GETSTAT:
 876                 cmd->info.l2_status = dev->l2_state;
 877                 break;
 878
 879         case PCBIT_IOCTL_STRLOAD:
 880                 if (dev->l2_state == L2_RUNNING)
 881                         return -EBUSY;
 882
 883                 dev->unack_seq = dev->send_seq = dev->rcv_seq = 0;
 884
 885                 dev->writeptr = dev->sh_mem;
 886                 dev->readptr = dev->sh_mem + BANK2;
 887
 888                 dev->l2_state = L2_LOADING;
 889                 break;
 890
 891         case PCBIT_IOCTL_LWMODE:
 892                 if (dev->l2_state != L2_LOADING)
 893                         return -EINVAL;
 894
 895                 dev->l2_state = L2_LWMODE;
 896                 break;
 897
 898         case PCBIT_IOCTL_FWMODE:
 899                 if (dev->l2_state == L2_RUNNING)
 900                         return -EBUSY;
 901                 dev->loadptr = LOAD_ZONE_START;
 902                 dev->l2_state = L2_FWMODE;
 903
 904                 break;
 905         case PCBIT_IOCTL_ENDLOAD:
 906                 if (dev->l2_state == L2_RUNNING)
 907                         return -EBUSY;
 908                 dev->l2_state = L2_DOWN;
 909                 break;
 910
 911         case PCBIT_IOCTL_SETBYTE:
 912                 if (dev->l2_state == L2_RUNNING)
 913                         return -EBUSY;
 914
 915                 /* check addr */
 916                 if (cmd->info.rdp_byte.addr > BANK4)
 917                         return -EFAULT;
 918
 919                 writeb(cmd->info.rdp_byte.value, dev->sh_mem + cmd->info.rdp_byte.addr);
 920                 break;
 921         case PCBIT_IOCTL_GETBYTE:
 922                 if (dev->l2_state == L2_RUNNING)
 923                         return -EBUSY;
 924
 925                 /* check addr */
 926
 927                 if (cmd->info.rdp_byte.addr > BANK4)
 928                 {
 929                         printk("getbyte: invalid addr %04x\n", cmd->info.rdp_byte.addr);
 930                         return -EFAULT;
 931                 }
 932
 933                 cmd->info.rdp_byte.value = readb(dev->sh_mem + cmd->info.rdp_byte.addr);
 934                 break;
 935         case PCBIT_IOCTL_RUNNING:
 936                 if (dev->l2_state == L2_RUNNING)
 937                         return -EBUSY;
 938                 return set_protocol_running(dev);
 939                 break;
 940         case PCBIT_IOCTL_WATCH188:
 941                 if (dev->l2_state != L2_LOADING)
 942                         return -EINVAL;
 943                 pcbit_l2_write(dev, MSG_WATCH188, 0x0001, NULL, 0);
 944                 break;
 945         case PCBIT_IOCTL_PING188:
 946                 if (dev->l2_state != L2_LOADING)
 947                         return -EINVAL;
 948                 pcbit_l2_write(dev, MSG_PING188_REQ, 0x0001, NULL, 0);
 949                 break;
 950         case PCBIT_IOCTL_APION:
 951                 if (dev->l2_state != L2_LOADING)
 952                         return -EINVAL;
 953                 pcbit_l2_write(dev, MSG_API_ON, 0x0001, NULL, 0);
 954                 break;
 955         case PCBIT_IOCTL_STOP:
 956                 dev->l2_state = L2_DOWN;
 957                 writeb(0x40, dev->sh_mem + BANK4);
 958                 dev->rcv_seq = 0;
 959                 dev->send_seq = 0;
 960                 dev->unack_seq = 0;
 961                 break;
 962         default:
 963                 printk("error: unknown ioctl\n");
 964                 break;
 965         }
 966         return 0;
 967 }
 968
 969 /*
 970  *        MSN list handling
 971  *
 972  *        if null reject all calls
 973  *        if first entry has null MSN accept all calls
 974  */
 975
 976 static void pcbit_clear_msn(struct pcbit_dev *dev)
 977 {
 978         struct msn_entry *ptr, *back;
 979
 980         for (ptr = dev->msn_list; ptr;)
 981         {
 982                 back = ptr->next;
 983                 kfree(ptr);
 984                 ptr = back;
 985         }
 986
 987         dev->msn_list = NULL;
 988 }
 989
 990 static void pcbit_set_msn(struct pcbit_dev *dev, char *list)
 991 {
 992         struct msn_entry *ptr;
 993         struct msn_entry *back = NULL;
 994         char *cp, *sp;
 995         int len;
 996
 997         if (strlen(list) == 0) {
 998                 ptr = kmalloc(sizeof(struct msn_entry), GFP_ATOMIC);
 999                 if (!ptr) {
1000                         printk(KERN_WARNING "kmalloc failed\n");
1001                         return;
1002                 }
1003
1004                 ptr->msn = NULL;
1005
1006                 ptr->next = dev->msn_list;
1007                 dev->msn_list = ptr;
1008
1009                 return;
1010         }
1011
1012         if (dev->msn_list)
1013                 for (back = dev->msn_list; back->next; back = back->next);
1014
1015         sp = list;
1016
1017         do {
1018                 cp = strchr(sp, ',');
1019                 if (cp)
1020                         len = cp - sp;
1021                 else
1022                         len = strlen(sp);
1023
1024                 ptr = kmalloc(sizeof(struct msn_entry), GFP_ATOMIC);
1025
1026                 if (!ptr) {
1027                         printk(KERN_WARNING "kmalloc failed\n");
1028                         return;
1029                 }
1030                 ptr->next = NULL;
1031
1032                 ptr->msn = kmalloc(len + 1, GFP_ATOMIC);
1033                 if (!ptr->msn) {
1034                         printk(KERN_WARNING "kmalloc failed\n");
1035                         kfree(ptr);
1036                         return;
1037                 }
1038
1039                 memcpy(ptr->msn, sp, len);
1040                 ptr->msn[len] = 0;
1041
1042 #ifdef DEBUG
1043                 printk(KERN_DEBUG "msn: %s\n", ptr->msn);
1044 #endif
1045                 if (dev->msn_list == NULL)
1046                         dev->msn_list = ptr;
1047                 else
1048                         back->next = ptr;
1049                 back = ptr;
1050                 sp += len;
1051         } while (cp);
1052 }
1053
1054 /*
1055  *  check if we do signal or reject an incoming call
1056  */
1057 static int pcbit_check_msn(struct pcbit_dev *dev, char *msn)
1058 {
1059         struct msn_entry *ptr;
1060
1061         for (ptr = dev->msn_list; ptr; ptr = ptr->next) {
1062
1063                 if (ptr->msn == NULL)
1064                         return 1;
1065
1066                 if (strcmp(ptr->msn, msn) == 0)
1067                         return 1;
1068         }
1069
1070         return 0;
1071 }