git.oblomov.eu Git - linux-2.6/blob - drivers/bluetooth/dtl1_cs.c

   1 /*
   2  *
   3  *  A driver for Nokia Connectivity Card DTL-1 devices
   4  *
   5  *  Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation;
  11  *
  12  *  Software distributed under the License is distributed on an "AS
  13  *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  14  *  implied. See the License for the specific language governing
  15  *  rights and limitations under the License.
  16  *
  17  *  The initial developer of the original code is David A. Hinds
  18  *  <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  19  *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  20  *
  21  */
  22
  23 #include <linux/module.h>
  24
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/types.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/ptrace.h>
  32 #include <linux/ioport.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/moduleparam.h>
  35
  36 #include <linux/skbuff.h>
  37 #include <linux/string.h>
  38 #include <linux/serial.h>
  39 #include <linux/serial_reg.h>
  40 #include <linux/bitops.h>
  41 #include <asm/system.h>
  42 #include <asm/io.h>
  43
  44 #include <pcmcia/cs_types.h>
  45 #include <pcmcia/cs.h>
  46 #include <pcmcia/cistpl.h>
  47 #include <pcmcia/ciscode.h>
  48 #include <pcmcia/ds.h>
  49 #include <pcmcia/cisreg.h>
  50
  51 #include <net/bluetooth/bluetooth.h>
  52 #include <net/bluetooth/hci_core.h>
  53
  54
  55
  56 /* ======================== Module parameters ======================== */
  57
  58
  59 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  60 MODULE_DESCRIPTION("Bluetooth driver for Nokia Connectivity Card DTL-1");
  61 MODULE_LICENSE("GPL");
  62
  63
  64
  65 /* ======================== Local structures ======================== */
  66
  67
  68 typedef struct dtl1_info_t {
  69         struct pcmcia_device *p_dev;
  70         dev_node_t node;
  71
  72         struct hci_dev *hdev;
  73
  74         spinlock_t lock;                /* For serializing operations */
  75
  76         unsigned long flowmask;         /* HCI flow mask */
  77         int ri_latch;
  78
  79         struct sk_buff_head txq;
  80         unsigned long tx_state;
  81
  82         unsigned long rx_state;
  83         unsigned long rx_count;
  84         struct sk_buff *rx_skb;
  85 } dtl1_info_t;
  86
  87
  88 static int dtl1_config(struct pcmcia_device *link);
  89 static void dtl1_release(struct pcmcia_device *link);
  90
  91 static void dtl1_detach(struct pcmcia_device *p_dev);
  92
  93
  94 /* Transmit states  */
  95 #define XMIT_SENDING  1
  96 #define XMIT_WAKEUP   2
  97 #define XMIT_WAITING  8
  98
  99 /* Receiver States */
 100 #define RECV_WAIT_NSH   0
 101 #define RECV_WAIT_DATA  1
 102
 103
 104 typedef struct {
 105         u8 type;
 106         u8 zero;
 107         u16 len;
 108 } __attribute__ ((packed)) nsh_t;       /* Nokia Specific Header */
 109
 110 #define NSHL  4                         /* Nokia Specific Header Length */
 111
 112
 113
 114 /* ======================== Interrupt handling ======================== */
 115
 116
 117 static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 118 {
 119         int actual = 0;
 120
 121         /* Tx FIFO should be empty */
 122         if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
 123                 return 0;
 124
 125         /* Fill FIFO with current frame */
 126         while ((fifo_size-- > 0) && (actual < len)) {
 127                 /* Transmit next byte */
 128                 outb(buf[actual], iobase + UART_TX);
 129                 actual++;
 130         }
 131
 132         return actual;
 133 }
 134
 135
 136 static void dtl1_write_wakeup(dtl1_info_t *info)
 137 {
 138         if (!info) {
 139                 BT_ERR("Unknown device");
 140                 return;
 141         }
 142
 143         if (test_bit(XMIT_WAITING, &(info->tx_state))) {
 144                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 145                 return;
 146         }
 147
 148         if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
 149                 set_bit(XMIT_WAKEUP, &(info->tx_state));
 150                 return;
 151         }
 152
 153         do {
 154                 register unsigned int iobase = info->p_dev->io.BasePort1;
 155                 register struct sk_buff *skb;
 156                 register int len;
 157
 158                 clear_bit(XMIT_WAKEUP, &(info->tx_state));
 159
 160                 if (!pcmcia_dev_present(info->p_dev))
 161                         return;
 162
 163                 if (!(skb = skb_dequeue(&(info->txq))))
 164                         break;
 165
 166                 /* Send frame */
 167                 len = dtl1_write(iobase, 32, skb->data, skb->len);
 168
 169                 if (len == skb->len) {
 170                         set_bit(XMIT_WAITING, &(info->tx_state));
 171                         kfree_skb(skb);
 172                 } else {
 173                         skb_pull(skb, len);
 174                         skb_queue_head(&(info->txq), skb);
 175                 }
 176
 177                 info->hdev->stat.byte_tx += len;
 178
 179         } while (test_bit(XMIT_WAKEUP, &(info->tx_state)));
 180
 181         clear_bit(XMIT_SENDING, &(info->tx_state));
 182 }
 183
 184
 185 static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
 186 {
 187         u8 flowmask = *(u8 *)skb->data;
 188         int i;
 189
 190         printk(KERN_INFO "Bluetooth: Nokia control data =");
 191         for (i = 0; i < skb->len; i++) {
 192                 printk(" %02x", skb->data[i]);
 193         }
 194         printk("\n");
 195
 196         /* transition to active state */
 197         if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
 198                 clear_bit(XMIT_WAITING, &(info->tx_state));
 199                 dtl1_write_wakeup(info);
 200         }
 201
 202         info->flowmask = flowmask;
 203
 204         kfree_skb(skb);
 205 }
 206
 207
 208 static void dtl1_receive(dtl1_info_t *info)
 209 {
 210         unsigned int iobase;
 211         nsh_t *nsh;
 212         int boguscount = 0;
 213
 214         if (!info) {
 215                 BT_ERR("Unknown device");
 216                 return;
 217         }
 218
 219         iobase = info->p_dev->io.BasePort1;
 220
 221         do {
 222                 info->hdev->stat.byte_rx++;
 223
 224                 /* Allocate packet */
 225                 if (info->rx_skb == NULL)
 226                         if (!(info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
 227                                 BT_ERR("Can't allocate mem for new packet");
 228                                 info->rx_state = RECV_WAIT_NSH;
 229                                 info->rx_count = NSHL;
 230                                 return;
 231                         }
 232
 233                 *skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
 234                 nsh = (nsh_t *)info->rx_skb->data;
 235
 236                 info->rx_count--;
 237
 238                 if (info->rx_count == 0) {
 239
 240                         switch (info->rx_state) {
 241                         case RECV_WAIT_NSH:
 242                                 info->rx_state = RECV_WAIT_DATA;
 243                                 info->rx_count = nsh->len + (nsh->len & 0x0001);
 244                                 break;
 245                         case RECV_WAIT_DATA:
 246                                 bt_cb(info->rx_skb)->pkt_type = nsh->type;
 247
 248                                 /* remove PAD byte if it exists */
 249                                 if (nsh->len & 0x0001) {
 250                                         info->rx_skb->tail--;
 251                                         info->rx_skb->len--;
 252                                 }
 253
 254                                 /* remove NSH */
 255                                 skb_pull(info->rx_skb, NSHL);
 256
 257                                 switch (bt_cb(info->rx_skb)->pkt_type) {
 258                                 case 0x80:
 259                                         /* control data for the Nokia Card */
 260                                         dtl1_control(info, info->rx_skb);
 261                                         break;
 262                                 case 0x82:
 263                                 case 0x83:
 264                                 case 0x84:
 265                                         /* send frame to the HCI layer */
 266                                         info->rx_skb->dev = (void *) info->hdev;
 267                                         bt_cb(info->rx_skb)->pkt_type &= 0x0f;
 268                                         hci_recv_frame(info->rx_skb);
 269                                         break;
 270                                 default:
 271                                         /* unknown packet */
 272                                         BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 273                                         kfree_skb(info->rx_skb);
 274                                         break;
 275                                 }
 276
 277                                 info->rx_state = RECV_WAIT_NSH;
 278                                 info->rx_count = NSHL;
 279                                 info->rx_skb = NULL;
 280                                 break;
 281                         }
 282
 283                 }
 284
 285                 /* Make sure we don't stay here too long */
 286                 if (boguscount++ > 32)
 287                         break;
 288
 289         } while (inb(iobase + UART_LSR) & UART_LSR_DR);
 290 }
 291
 292
 293 static irqreturn_t dtl1_interrupt(int irq, void *dev_inst)
 294 {
 295         dtl1_info_t *info = dev_inst;
 296         unsigned int iobase;
 297         unsigned char msr;
 298         int boguscount = 0;
 299         int iir, lsr;
 300
 301         if (!info || !info->hdev) {
 302                 BT_ERR("Call of irq %d for unknown device", irq);
 303                 return IRQ_NONE;
 304         }
 305
 306         iobase = info->p_dev->io.BasePort1;
 307
 308         spin_lock(&(info->lock));
 309
 310         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 311         while (iir) {
 312
 313                 /* Clear interrupt */
 314                 lsr = inb(iobase + UART_LSR);
 315
 316                 switch (iir) {
 317                 case UART_IIR_RLSI:
 318                         BT_ERR("RLSI");
 319                         break;
 320                 case UART_IIR_RDI:
 321                         /* Receive interrupt */
 322                         dtl1_receive(info);
 323                         break;
 324                 case UART_IIR_THRI:
 325                         if (lsr & UART_LSR_THRE) {
 326                                 /* Transmitter ready for data */
 327                                 dtl1_write_wakeup(info);
 328                         }
 329                         break;
 330                 default:
 331                         BT_ERR("Unhandled IIR=%#x", iir);
 332                         break;
 333                 }
 334
 335                 /* Make sure we don't stay here too long */
 336                 if (boguscount++ > 100)
 337                         break;
 338
 339                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 340
 341         }
 342
 343         msr = inb(iobase + UART_MSR);
 344
 345         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 346                 info->ri_latch = msr & UART_MSR_RI;
 347                 clear_bit(XMIT_WAITING, &(info->tx_state));
 348                 dtl1_write_wakeup(info);
 349         }
 350
 351         spin_unlock(&(info->lock));
 352
 353         return IRQ_HANDLED;
 354 }
 355
 356
 357
 358 /* ======================== HCI interface ======================== */
 359
 360
 361 static int dtl1_hci_open(struct hci_dev *hdev)
 362 {
 363         set_bit(HCI_RUNNING, &(hdev->flags));
 364
 365         return 0;
 366 }
 367
 368
 369 static int dtl1_hci_flush(struct hci_dev *hdev)
 370 {
 371         dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
 372
 373         /* Drop TX queue */
 374         skb_queue_purge(&(info->txq));
 375
 376         return 0;
 377 }
 378
 379
 380 static int dtl1_hci_close(struct hci_dev *hdev)
 381 {
 382         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 383                 return 0;
 384
 385         dtl1_hci_flush(hdev);
 386
 387         return 0;
 388 }
 389
 390
 391 static int dtl1_hci_send_frame(struct sk_buff *skb)
 392 {
 393         dtl1_info_t *info;
 394         struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 395         struct sk_buff *s;
 396         nsh_t nsh;
 397
 398         if (!hdev) {
 399                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 400                 return -ENODEV;
 401         }
 402
 403         info = (dtl1_info_t *)(hdev->driver_data);
 404
 405         switch (bt_cb(skb)->pkt_type) {
 406         case HCI_COMMAND_PKT:
 407                 hdev->stat.cmd_tx++;
 408                 nsh.type = 0x81;
 409                 break;
 410         case HCI_ACLDATA_PKT:
 411                 hdev->stat.acl_tx++;
 412                 nsh.type = 0x82;
 413                 break;
 414         case HCI_SCODATA_PKT:
 415                 hdev->stat.sco_tx++;
 416                 nsh.type = 0x83;
 417                 break;
 418         };
 419
 420         nsh.zero = 0;
 421         nsh.len = skb->len;
 422
 423         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 424         if (!s)
 425                 return -ENOMEM;
 426
 427         skb_reserve(s, NSHL);
 428         memcpy(skb_put(s, skb->len), skb->data, skb->len);
 429         if (skb->len & 0x0001)
 430                 *skb_put(s, 1) = 0;     /* PAD */
 431
 432         /* Prepend skb with Nokia frame header and queue */
 433         memcpy(skb_push(s, NSHL), &nsh, NSHL);
 434         skb_queue_tail(&(info->txq), s);
 435
 436         dtl1_write_wakeup(info);
 437
 438         kfree_skb(skb);
 439
 440         return 0;
 441 }
 442
 443
 444 static void dtl1_hci_destruct(struct hci_dev *hdev)
 445 {
 446 }
 447
 448
 449 static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
 450 {
 451         return -ENOIOCTLCMD;
 452 }
 453
 454
 455
 456 /* ======================== Card services HCI interaction ======================== */
 457
 458
 459 static int dtl1_open(dtl1_info_t *info)
 460 {
 461         unsigned long flags;
 462         unsigned int iobase = info->p_dev->io.BasePort1;
 463         struct hci_dev *hdev;
 464
 465         spin_lock_init(&(info->lock));
 466
 467         skb_queue_head_init(&(info->txq));
 468
 469         info->rx_state = RECV_WAIT_NSH;
 470         info->rx_count = NSHL;
 471         info->rx_skb = NULL;
 472
 473         set_bit(XMIT_WAITING, &(info->tx_state));
 474
 475         /* Initialize HCI device */
 476         hdev = hci_alloc_dev();
 477         if (!hdev) {
 478                 BT_ERR("Can't allocate HCI device");
 479                 return -ENOMEM;
 480         }
 481
 482         info->hdev = hdev;
 483
 484         hdev->type = HCI_PCCARD;
 485         hdev->driver_data = info;
 486         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 487
 488         hdev->open     = dtl1_hci_open;
 489         hdev->close    = dtl1_hci_close;
 490         hdev->flush    = dtl1_hci_flush;
 491         hdev->send     = dtl1_hci_send_frame;
 492         hdev->destruct = dtl1_hci_destruct;
 493         hdev->ioctl    = dtl1_hci_ioctl;
 494
 495         hdev->owner = THIS_MODULE;
 496
 497         spin_lock_irqsave(&(info->lock), flags);
 498
 499         /* Reset UART */
 500         outb(0, iobase + UART_MCR);
 501
 502         /* Turn off interrupts */
 503         outb(0, iobase + UART_IER);
 504
 505         /* Initialize UART */
 506         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 507         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 508
 509         info->ri_latch = inb(info->p_dev->io.BasePort1 + UART_MSR) & UART_MSR_RI;
 510
 511         /* Turn on interrupts */
 512         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 513
 514         spin_unlock_irqrestore(&(info->lock), flags);
 515
 516         /* Timeout before it is safe to send the first HCI packet */
 517         msleep(2000);
 518
 519         /* Register HCI device */
 520         if (hci_register_dev(hdev) < 0) {
 521                 BT_ERR("Can't register HCI device");
 522                 info->hdev = NULL;
 523                 hci_free_dev(hdev);
 524                 return -ENODEV;
 525         }
 526
 527         return 0;
 528 }
 529
 530
 531 static int dtl1_close(dtl1_info_t *info)
 532 {
 533         unsigned long flags;
 534         unsigned int iobase = info->p_dev->io.BasePort1;
 535         struct hci_dev *hdev = info->hdev;
 536
 537         if (!hdev)
 538                 return -ENODEV;
 539
 540         dtl1_hci_close(hdev);
 541
 542         spin_lock_irqsave(&(info->lock), flags);
 543
 544         /* Reset UART */
 545         outb(0, iobase + UART_MCR);
 546
 547         /* Turn off interrupts */
 548         outb(0, iobase + UART_IER);
 549
 550         spin_unlock_irqrestore(&(info->lock), flags);
 551
 552         if (hci_unregister_dev(hdev) < 0)
 553                 BT_ERR("Can't unregister HCI device %s", hdev->name);
 554
 555         hci_free_dev(hdev);
 556
 557         return 0;
 558 }
 559
 560 static int dtl1_probe(struct pcmcia_device *link)
 561 {
 562         dtl1_info_t *info;
 563
 564         /* Create new info device */
 565         info = kzalloc(sizeof(*info), GFP_KERNEL);
 566         if (!info)
 567                 return -ENOMEM;
 568
 569         info->p_dev = link;
 570         link->priv = info;
 571
 572         link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 573         link->io.NumPorts1 = 8;
 574         link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
 575         link->irq.IRQInfo1 = IRQ_LEVEL_ID;
 576
 577         link->irq.Handler = dtl1_interrupt;
 578         link->irq.Instance = info;
 579
 580         link->conf.Attributes = CONF_ENABLE_IRQ;
 581         link->conf.IntType = INT_MEMORY_AND_IO;
 582
 583         return dtl1_config(link);
 584 }
 585
 586
 587 static void dtl1_detach(struct pcmcia_device *link)
 588 {
 589         dtl1_info_t *info = link->priv;
 590
 591         dtl1_release(link);
 592
 593         kfree(info);
 594 }
 595
 596 static int get_tuple(struct pcmcia_device *handle, tuple_t *tuple, cisparse_t *parse)
 597 {
 598         int i;
 599
 600         i = pcmcia_get_tuple_data(handle, tuple);
 601         if (i != CS_SUCCESS)
 602                 return i;
 603
 604         return pcmcia_parse_tuple(handle, tuple, parse);
 605 }
 606
 607 static int first_tuple(struct pcmcia_device *handle, tuple_t *tuple, cisparse_t *parse)
 608 {
 609         if (pcmcia_get_first_tuple(handle, tuple) != CS_SUCCESS)
 610                 return CS_NO_MORE_ITEMS;
 611         return get_tuple(handle, tuple, parse);
 612 }
 613
 614 static int next_tuple(struct pcmcia_device *handle, tuple_t *tuple, cisparse_t *parse)
 615 {
 616         if (pcmcia_get_next_tuple(handle, tuple) != CS_SUCCESS)
 617                 return CS_NO_MORE_ITEMS;
 618         return get_tuple(handle, tuple, parse);
 619 }
 620
 621 static int dtl1_config(struct pcmcia_device *link)
 622 {
 623         dtl1_info_t *info = link->priv;
 624         tuple_t tuple;
 625         u_short buf[256];
 626         cisparse_t parse;
 627         cistpl_cftable_entry_t *cf = &parse.cftable_entry;
 628         int i;
 629
 630         tuple.TupleData = (cisdata_t *)buf;
 631         tuple.TupleOffset = 0;
 632         tuple.TupleDataMax = 255;
 633         tuple.Attributes = 0;
 634         tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 635
 636         /* Look for a generic full-sized window */
 637         link->io.NumPorts1 = 8;
 638         i = first_tuple(link, &tuple, &parse);
 639         while (i != CS_NO_MORE_ITEMS) {
 640                 if ((i == CS_SUCCESS) && (cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
 641                         link->conf.ConfigIndex = cf->index;
 642                         link->io.BasePort1 = cf->io.win[0].base;
 643                         link->io.NumPorts1 = cf->io.win[0].len; /*yo */
 644                         link->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
 645                         i = pcmcia_request_io(link, &link->io);
 646                         if (i == CS_SUCCESS)
 647                                 break;
 648                 }
 649                 i = next_tuple(link, &tuple, &parse);
 650         }
 651
 652         if (i != CS_SUCCESS) {
 653                 cs_error(link, RequestIO, i);
 654                 goto failed;
 655         }
 656
 657         i = pcmcia_request_irq(link, &link->irq);
 658         if (i != CS_SUCCESS) {
 659                 cs_error(link, RequestIRQ, i);
 660                 link->irq.AssignedIRQ = 0;
 661         }
 662
 663         i = pcmcia_request_configuration(link, &link->conf);
 664         if (i != CS_SUCCESS) {
 665                 cs_error(link, RequestConfiguration, i);
 666                 goto failed;
 667         }
 668
 669         if (dtl1_open(info) != 0)
 670                 goto failed;
 671
 672         strcpy(info->node.dev_name, info->hdev->name);
 673         link->dev_node = &info->node;
 674
 675         return 0;
 676
 677 failed:
 678         dtl1_release(link);
 679         return -ENODEV;
 680 }
 681
 682
 683 static void dtl1_release(struct pcmcia_device *link)
 684 {
 685         dtl1_info_t *info = link->priv;
 686
 687         dtl1_close(info);
 688
 689         pcmcia_disable_device(link);
 690 }
 691
 692
 693 static struct pcmcia_device_id dtl1_ids[] = {
 694         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 695         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 696         PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 697         PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 698         PCMCIA_DEVICE_NULL
 699 };
 700 MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 701
 702 static struct pcmcia_driver dtl1_driver = {
 703         .owner          = THIS_MODULE,
 704         .drv            = {
 705                 .name   = "dtl1_cs",
 706         },
 707         .probe          = dtl1_probe,
 708         .remove         = dtl1_detach,
 709         .id_table       = dtl1_ids,
 710 };
 711
 712 static int __init init_dtl1_cs(void)
 713 {
 714         return pcmcia_register_driver(&dtl1_driver);
 715 }
 716
 717
 718 static void __exit exit_dtl1_cs(void)
 719 {
 720         pcmcia_unregister_driver(&dtl1_driver);
 721 }
 722
 723 module_init(init_dtl1_cs);
 724 module_exit(exit_dtl1_cs);