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         BUG_ON(!info->hdev);
 302
 303         iobase = info->p_dev->io.BasePort1;
 304
 305         spin_lock(&(info->lock));
 306
 307         iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 308         while (iir) {
 309
 310                 /* Clear interrupt */
 311                 lsr = inb(iobase + UART_LSR);
 312
 313                 switch (iir) {
 314                 case UART_IIR_RLSI:
 315                         BT_ERR("RLSI");
 316                         break;
 317                 case UART_IIR_RDI:
 318                         /* Receive interrupt */
 319                         dtl1_receive(info);
 320                         break;
 321                 case UART_IIR_THRI:
 322                         if (lsr & UART_LSR_THRE) {
 323                                 /* Transmitter ready for data */
 324                                 dtl1_write_wakeup(info);
 325                         }
 326                         break;
 327                 default:
 328                         BT_ERR("Unhandled IIR=%#x", iir);
 329                         break;
 330                 }
 331
 332                 /* Make sure we don't stay here too long */
 333                 if (boguscount++ > 100)
 334                         break;
 335
 336                 iir = inb(iobase + UART_IIR) & UART_IIR_ID;
 337
 338         }
 339
 340         msr = inb(iobase + UART_MSR);
 341
 342         if (info->ri_latch ^ (msr & UART_MSR_RI)) {
 343                 info->ri_latch = msr & UART_MSR_RI;
 344                 clear_bit(XMIT_WAITING, &(info->tx_state));
 345                 dtl1_write_wakeup(info);
 346         }
 347
 348         spin_unlock(&(info->lock));
 349
 350         return IRQ_HANDLED;
 351 }
 352
 353
 354
 355 /* ======================== HCI interface ======================== */
 356
 357
 358 static int dtl1_hci_open(struct hci_dev *hdev)
 359 {
 360         set_bit(HCI_RUNNING, &(hdev->flags));
 361
 362         return 0;
 363 }
 364
 365
 366 static int dtl1_hci_flush(struct hci_dev *hdev)
 367 {
 368         dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);
 369
 370         /* Drop TX queue */
 371         skb_queue_purge(&(info->txq));
 372
 373         return 0;
 374 }
 375
 376
 377 static int dtl1_hci_close(struct hci_dev *hdev)
 378 {
 379         if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
 380                 return 0;
 381
 382         dtl1_hci_flush(hdev);
 383
 384         return 0;
 385 }
 386
 387
 388 static int dtl1_hci_send_frame(struct sk_buff *skb)
 389 {
 390         dtl1_info_t *info;
 391         struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
 392         struct sk_buff *s;
 393         nsh_t nsh;
 394
 395         if (!hdev) {
 396                 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
 397                 return -ENODEV;
 398         }
 399
 400         info = (dtl1_info_t *)(hdev->driver_data);
 401
 402         switch (bt_cb(skb)->pkt_type) {
 403         case HCI_COMMAND_PKT:
 404                 hdev->stat.cmd_tx++;
 405                 nsh.type = 0x81;
 406                 break;
 407         case HCI_ACLDATA_PKT:
 408                 hdev->stat.acl_tx++;
 409                 nsh.type = 0x82;
 410                 break;
 411         case HCI_SCODATA_PKT:
 412                 hdev->stat.sco_tx++;
 413                 nsh.type = 0x83;
 414                 break;
 415         };
 416
 417         nsh.zero = 0;
 418         nsh.len = skb->len;
 419
 420         s = bt_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
 421         if (!s)
 422                 return -ENOMEM;
 423
 424         skb_reserve(s, NSHL);
 425         skb_copy_from_linear_data(skb, skb_put(s, skb->len), skb->len);
 426         if (skb->len & 0x0001)
 427                 *skb_put(s, 1) = 0;     /* PAD */
 428
 429         /* Prepend skb with Nokia frame header and queue */
 430         memcpy(skb_push(s, NSHL), &nsh, NSHL);
 431         skb_queue_tail(&(info->txq), s);
 432
 433         dtl1_write_wakeup(info);
 434
 435         kfree_skb(skb);
 436
 437         return 0;
 438 }
 439
 440
 441 static void dtl1_hci_destruct(struct hci_dev *hdev)
 442 {
 443 }
 444
 445
 446 static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
 447 {
 448         return -ENOIOCTLCMD;
 449 }
 450
 451
 452
 453 /* ======================== Card services HCI interaction ======================== */
 454
 455
 456 static int dtl1_open(dtl1_info_t *info)
 457 {
 458         unsigned long flags;
 459         unsigned int iobase = info->p_dev->io.BasePort1;
 460         struct hci_dev *hdev;
 461
 462         spin_lock_init(&(info->lock));
 463
 464         skb_queue_head_init(&(info->txq));
 465
 466         info->rx_state = RECV_WAIT_NSH;
 467         info->rx_count = NSHL;
 468         info->rx_skb = NULL;
 469
 470         set_bit(XMIT_WAITING, &(info->tx_state));
 471
 472         /* Initialize HCI device */
 473         hdev = hci_alloc_dev();
 474         if (!hdev) {
 475                 BT_ERR("Can't allocate HCI device");
 476                 return -ENOMEM;
 477         }
 478
 479         info->hdev = hdev;
 480
 481         hdev->type = HCI_PCCARD;
 482         hdev->driver_data = info;
 483         SET_HCIDEV_DEV(hdev, &info->p_dev->dev);
 484
 485         hdev->open     = dtl1_hci_open;
 486         hdev->close    = dtl1_hci_close;
 487         hdev->flush    = dtl1_hci_flush;
 488         hdev->send     = dtl1_hci_send_frame;
 489         hdev->destruct = dtl1_hci_destruct;
 490         hdev->ioctl    = dtl1_hci_ioctl;
 491
 492         hdev->owner = THIS_MODULE;
 493
 494         spin_lock_irqsave(&(info->lock), flags);
 495
 496         /* Reset UART */
 497         outb(0, iobase + UART_MCR);
 498
 499         /* Turn off interrupts */
 500         outb(0, iobase + UART_IER);
 501
 502         /* Initialize UART */
 503         outb(UART_LCR_WLEN8, iobase + UART_LCR);        /* Reset DLAB */
 504         outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);
 505
 506         info->ri_latch = inb(info->p_dev->io.BasePort1 + UART_MSR) & UART_MSR_RI;
 507
 508         /* Turn on interrupts */
 509         outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);
 510
 511         spin_unlock_irqrestore(&(info->lock), flags);
 512
 513         /* Timeout before it is safe to send the first HCI packet */
 514         msleep(2000);
 515
 516         /* Register HCI device */
 517         if (hci_register_dev(hdev) < 0) {
 518                 BT_ERR("Can't register HCI device");
 519                 info->hdev = NULL;
 520                 hci_free_dev(hdev);
 521                 return -ENODEV;
 522         }
 523
 524         return 0;
 525 }
 526
 527
 528 static int dtl1_close(dtl1_info_t *info)
 529 {
 530         unsigned long flags;
 531         unsigned int iobase = info->p_dev->io.BasePort1;
 532         struct hci_dev *hdev = info->hdev;
 533
 534         if (!hdev)
 535                 return -ENODEV;
 536
 537         dtl1_hci_close(hdev);
 538
 539         spin_lock_irqsave(&(info->lock), flags);
 540
 541         /* Reset UART */
 542         outb(0, iobase + UART_MCR);
 543
 544         /* Turn off interrupts */
 545         outb(0, iobase + UART_IER);
 546
 547         spin_unlock_irqrestore(&(info->lock), flags);
 548
 549         if (hci_unregister_dev(hdev) < 0)
 550                 BT_ERR("Can't unregister HCI device %s", hdev->name);
 551
 552         hci_free_dev(hdev);
 553
 554         return 0;
 555 }
 556
 557 static int dtl1_probe(struct pcmcia_device *link)
 558 {
 559         dtl1_info_t *info;
 560
 561         /* Create new info device */
 562         info = kzalloc(sizeof(*info), GFP_KERNEL);
 563         if (!info)
 564                 return -ENOMEM;
 565
 566         info->p_dev = link;
 567         link->priv = info;
 568
 569         link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 570         link->io.NumPorts1 = 8;
 571         link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
 572         link->irq.IRQInfo1 = IRQ_LEVEL_ID;
 573
 574         link->irq.Handler = dtl1_interrupt;
 575         link->irq.Instance = info;
 576
 577         link->conf.Attributes = CONF_ENABLE_IRQ;
 578         link->conf.IntType = INT_MEMORY_AND_IO;
 579
 580         return dtl1_config(link);
 581 }
 582
 583
 584 static void dtl1_detach(struct pcmcia_device *link)
 585 {
 586         dtl1_info_t *info = link->priv;
 587
 588         dtl1_release(link);
 589
 590         kfree(info);
 591 }
 592
 593 static int get_tuple(struct pcmcia_device *handle, tuple_t *tuple, cisparse_t *parse)
 594 {
 595         int i;
 596
 597         i = pcmcia_get_tuple_data(handle, tuple);
 598         if (i != CS_SUCCESS)
 599                 return i;
 600
 601         return pcmcia_parse_tuple(handle, tuple, parse);
 602 }
 603
 604 static int first_tuple(struct pcmcia_device *handle, tuple_t *tuple, cisparse_t *parse)
 605 {
 606         if (pcmcia_get_first_tuple(handle, tuple) != CS_SUCCESS)
 607                 return CS_NO_MORE_ITEMS;
 608         return get_tuple(handle, tuple, parse);
 609 }
 610
 611 static int next_tuple(struct pcmcia_device *handle, tuple_t *tuple, cisparse_t *parse)
 612 {
 613         if (pcmcia_get_next_tuple(handle, tuple) != CS_SUCCESS)
 614                 return CS_NO_MORE_ITEMS;
 615         return get_tuple(handle, tuple, parse);
 616 }
 617
 618 static int dtl1_config(struct pcmcia_device *link)
 619 {
 620         dtl1_info_t *info = link->priv;
 621         tuple_t tuple;
 622         u_short buf[256];
 623         cisparse_t parse;
 624         cistpl_cftable_entry_t *cf = &parse.cftable_entry;
 625         int i;
 626
 627         tuple.TupleData = (cisdata_t *)buf;
 628         tuple.TupleOffset = 0;
 629         tuple.TupleDataMax = 255;
 630         tuple.Attributes = 0;
 631         tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 632
 633         /* Look for a generic full-sized window */
 634         link->io.NumPorts1 = 8;
 635         i = first_tuple(link, &tuple, &parse);
 636         while (i != CS_NO_MORE_ITEMS) {
 637                 if ((i == CS_SUCCESS) && (cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
 638                         link->conf.ConfigIndex = cf->index;
 639                         link->io.BasePort1 = cf->io.win[0].base;
 640                         link->io.NumPorts1 = cf->io.win[0].len; /*yo */
 641                         link->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
 642                         i = pcmcia_request_io(link, &link->io);
 643                         if (i == CS_SUCCESS)
 644                                 break;
 645                 }
 646                 i = next_tuple(link, &tuple, &parse);
 647         }
 648
 649         if (i != CS_SUCCESS) {
 650                 cs_error(link, RequestIO, i);
 651                 goto failed;
 652         }
 653
 654         i = pcmcia_request_irq(link, &link->irq);
 655         if (i != CS_SUCCESS) {
 656                 cs_error(link, RequestIRQ, i);
 657                 link->irq.AssignedIRQ = 0;
 658         }
 659
 660         i = pcmcia_request_configuration(link, &link->conf);
 661         if (i != CS_SUCCESS) {
 662                 cs_error(link, RequestConfiguration, i);
 663                 goto failed;
 664         }
 665
 666         if (dtl1_open(info) != 0)
 667                 goto failed;
 668
 669         strcpy(info->node.dev_name, info->hdev->name);
 670         link->dev_node = &info->node;
 671
 672         return 0;
 673
 674 failed:
 675         dtl1_release(link);
 676         return -ENODEV;
 677 }
 678
 679
 680 static void dtl1_release(struct pcmcia_device *link)
 681 {
 682         dtl1_info_t *info = link->priv;
 683
 684         dtl1_close(info);
 685
 686         pcmcia_disable_device(link);
 687 }
 688
 689
 690 static struct pcmcia_device_id dtl1_ids[] = {
 691         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-1", 0xe1bfdd64, 0xe168480d),
 692         PCMCIA_DEVICE_PROD_ID12("Nokia Mobile Phones", "DTL-4", 0xe1bfdd64, 0x9102bc82),
 693         PCMCIA_DEVICE_PROD_ID12("Socket", "CF", 0xb38bcc2e, 0x44ebf863),
 694         PCMCIA_DEVICE_PROD_ID12("Socket", "CF+ Personal Network Card", 0xb38bcc2e, 0xe732bae3),
 695         PCMCIA_DEVICE_NULL
 696 };
 697 MODULE_DEVICE_TABLE(pcmcia, dtl1_ids);
 698
 699 static struct pcmcia_driver dtl1_driver = {
 700         .owner          = THIS_MODULE,
 701         .drv            = {
 702                 .name   = "dtl1_cs",
 703         },
 704         .probe          = dtl1_probe,
 705         .remove         = dtl1_detach,
 706         .id_table       = dtl1_ids,
 707 };
 708
 709 static int __init init_dtl1_cs(void)
 710 {
 711         return pcmcia_register_driver(&dtl1_driver);
 712 }
 713
 714
 715 static void __exit exit_dtl1_cs(void)
 716 {
 717         pcmcia_unregister_driver(&dtl1_driver);
 718 }
 719
 720 module_init(init_dtl1_cs);
 721 module_exit(exit_dtl1_cs);