drivers/w1/dscore.c

   1 /*
   2  *      dscore.c
   3  *
   4  * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
   5  *
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/mod_devicetable.h>
  25 #include <linux/usb.h>
  26
  27 #include "dscore.h"
  28
  29 static struct usb_device_id ds_id_table [] = {
  30         { USB_DEVICE(0x04fa, 0x2490) },
  31         { },
  32 };
  33 MODULE_DEVICE_TABLE(usb, ds_id_table);
  34
  35 static int ds_probe(struct usb_interface *, const struct usb_device_id *);
  36 static void ds_disconnect(struct usb_interface *);
  37
  38 int ds_touch_bit(struct ds_device *, u8, u8 *);
  39 int ds_read_byte(struct ds_device *, u8 *);
  40 int ds_read_bit(struct ds_device *, u8 *);
  41 int ds_write_byte(struct ds_device *, u8);
  42 int ds_write_bit(struct ds_device *, u8);
  43 static int ds_start_pulse(struct ds_device *, int);
  44 int ds_reset(struct ds_device *, struct ds_status *);
  45 struct ds_device * ds_get_device(void);
  46 void ds_put_device(struct ds_device *);
  47
  48 static inline void ds_dump_status(unsigned char *, unsigned char *, int);
  49 static int ds_send_control(struct ds_device *, u16, u16);
  50 static int ds_send_control_mode(struct ds_device *, u16, u16);
  51 static int ds_send_control_cmd(struct ds_device *, u16, u16);
  52
  53
  54 static struct usb_driver ds_driver = {
  55         .owner =        THIS_MODULE,
  56         .name =         "DS9490R",
  57         .probe =        ds_probe,
  58         .disconnect =   ds_disconnect,
  59         .id_table =     ds_id_table,
  60 };
  61
  62 static struct ds_device *ds_dev;
  63
  64 struct ds_device * ds_get_device(void)
  65 {
  66         if (ds_dev)
  67                 atomic_inc(&ds_dev->refcnt);
  68         return ds_dev;
  69 }
  70
  71 void ds_put_device(struct ds_device *dev)
  72 {
  73         atomic_dec(&dev->refcnt);
  74 }
  75
  76 static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
  77 {
  78         int err;
  79
  80         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
  81                         CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
  82         if (err < 0) {
  83                 printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
  84                                 value, index, err);
  85                 return err;
  86         }
  87
  88         return err;
  89 }
  90
  91 static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
  92 {
  93         int err;
  94
  95         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
  96                         MODE_CMD, 0x40, value, index, NULL, 0, 1000);
  97         if (err < 0) {
  98                 printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
  99                                 value, index, err);
 100                 return err;
 101         }
 102
 103         return err;
 104 }
 105
 106 static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
 107 {
 108         int err;
 109
 110         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 111                         COMM_CMD, 0x40, value, index, NULL, 0, 1000);
 112         if (err < 0) {
 113                 printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
 114                                 value, index, err);
 115                 return err;
 116         }
 117
 118         return err;
 119 }
 120
 121 static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int off)
 122 {
 123         printk("%45s: %8x\n", str, buf[off]);
 124 }
 125
 126 static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
 127                                  unsigned char *buf, int size)
 128 {
 129         int count, err;
 130
 131         memset(st, 0, sizeof(st));
 132
 133         count = 0;
 134         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
 135         if (err < 0) {
 136                 printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
 137                 return err;
 138         }
 139
 140         if (count >= sizeof(*st))
 141                 memcpy(st, buf, sizeof(*st));
 142
 143         return count;
 144 }
 145
 146 static int ds_recv_status(struct ds_device *dev, struct ds_status *st)
 147 {
 148         unsigned char buf[64];
 149         int count, err = 0, i;
 150
 151         memcpy(st, buf, sizeof(*st));
 152
 153         count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 154         if (count < 0)
 155                 return err;
 156
 157         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
 158         for (i=0; i<count; ++i)
 159                 printk("%02x ", buf[i]);
 160         printk("\n");
 161
 162         if (count >= 16) {
 163                 ds_dump_status(buf, "enable flag", 0);
 164                 ds_dump_status(buf, "1-wire speed", 1);
 165                 ds_dump_status(buf, "strong pullup duration", 2);
 166                 ds_dump_status(buf, "programming pulse duration", 3);
 167                 ds_dump_status(buf, "pulldown slew rate control", 4);
 168                 ds_dump_status(buf, "write-1 low time", 5);
 169                 ds_dump_status(buf, "data sample offset/write-0 recovery time", 6);
 170                 ds_dump_status(buf, "reserved (test register)", 7);
 171                 ds_dump_status(buf, "device status flags", 8);
 172                 ds_dump_status(buf, "communication command byte 1", 9);
 173                 ds_dump_status(buf, "communication command byte 2", 10);
 174                 ds_dump_status(buf, "communication command buffer status", 11);
 175                 ds_dump_status(buf, "1-wire data output buffer status", 12);
 176                 ds_dump_status(buf, "1-wire data input buffer status", 13);
 177                 ds_dump_status(buf, "reserved", 14);
 178                 ds_dump_status(buf, "reserved", 15);
 179         }
 180
 181         memcpy(st, buf, sizeof(*st));
 182
 183         if (st->status & ST_EPOF) {
 184                 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
 185                 err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 186                 if (err)
 187                         return err;
 188                 count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 189                 if (count < 0)
 190                         return err;
 191         }
 192 #if 0
 193         if (st->status & ST_IDLE) {
 194                 printk(KERN_INFO "Resetting pulse after ST_IDLE.\n");
 195                 err = ds_start_pulse(dev, PULLUP_PULSE_DURATION);
 196                 if (err)
 197                         return err;
 198         }
 199 #endif
 200
 201         return err;
 202 }
 203
 204 static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
 205 {
 206         int count, err;
 207         struct ds_status st;
 208
 209         count = 0;
 210         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
 211                                 buf, size, &count, 1000);
 212         if (err < 0) {
 213                 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
 214                 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
 215                 ds_recv_status(dev, &st);
 216                 return err;
 217         }
 218
 219 #if 0
 220         {
 221                 int i;
 222
 223                 printk("%s: count=%d: ", __func__, count);
 224                 for (i=0; i<count; ++i)
 225                         printk("%02x ", buf[i]);
 226                 printk("\n");
 227         }
 228 #endif
 229         return count;
 230 }
 231
 232 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 233 {
 234         int count, err;
 235
 236         count = 0;
 237         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 238         if (err < 0) {
 239                 printk(KERN_ERR "Failed to read 1-wire data from 0x02: err=%d.\n", err);
 240                 return err;
 241         }
 242
 243         return err;
 244 }
 245
 246 #if 0
 247
 248 int ds_stop_pulse(struct ds_device *dev, int limit)
 249 {
 250         struct ds_status st;
 251         int count = 0, err = 0;
 252         u8 buf[0x20];
 253
 254         do {
 255                 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
 256                 if (err)
 257                         break;
 258                 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
 259                 if (err)
 260                         break;
 261                 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 262                 if (err)
 263                         break;
 264
 265                 if ((st.status & ST_SPUA) == 0) {
 266                         err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
 267                         if (err)
 268                                 break;
 269                 }
 270         } while(++count < limit);
 271
 272         return err;
 273 }
 274
 275 int ds_detect(struct ds_device *dev, struct ds_status *st)
 276 {
 277         int err;
 278
 279         err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 280         if (err)
 281                 return err;
 282
 283         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
 284         if (err)
 285                 return err;
 286
 287         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
 288         if (err)
 289                 return err;
 290
 291         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
 292         if (err)
 293                 return err;
 294
 295         err = ds_recv_status(dev, st);
 296
 297         return err;
 298 }
 299
 300 #endif  /*  0  */
 301
 302 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 303 {
 304         u8 buf[0x20];
 305         int err, count = 0;
 306
 307         do {
 308                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 309 #if 0
 310                 if (err >= 0) {
 311                         int i;
 312                         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
 313                         for (i=0; i<err; ++i)
 314                                 printk("%02x ", buf[i]);
 315                         printk("\n");
 316                 }
 317 #endif
 318         } while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);
 319
 320
 321         if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) {
 322                 ds_recv_status(dev, st);
 323                 return -1;
 324         } else
 325                 return 0;
 326 }
 327
 328 int ds_reset(struct ds_device *dev, struct ds_status *st)
 329 {
 330         int err;
 331
 332         //err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_F | COMM_IM | COMM_SE, SPEED_FLEXIBLE);
 333         err = ds_send_control(dev, 0x43, SPEED_NORMAL);
 334         if (err)
 335                 return err;
 336
 337         ds_wait_status(dev, st);
 338 #if 0
 339         if (st->command_buffer_status) {
 340                 printk(KERN_INFO "Short circuit.\n");
 341                 return -EIO;
 342         }
 343 #endif
 344
 345         return 0;
 346 }
 347
 348 #if 0
 349 int ds_set_speed(struct ds_device *dev, int speed)
 350 {
 351         int err;
 352
 353         if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
 354                 return -EINVAL;
 355
 356         if (speed != SPEED_OVERDRIVE)
 357                 speed = SPEED_FLEXIBLE;
 358
 359         speed &= 0xff;
 360
 361         err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
 362         if (err)
 363                 return err;
 364
 365         return err;
 366 }
 367 #endif  /*  0  */
 368
 369 static int ds_start_pulse(struct ds_device *dev, int delay)
 370 {
 371         int err;
 372         u8 del = 1 + (u8)(delay >> 4);
 373         struct ds_status st;
 374
 375 #if 0
 376         err = ds_stop_pulse(dev, 10);
 377         if (err)
 378                 return err;
 379
 380         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
 381         if (err)
 382                 return err;
 383 #endif
 384         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 385         if (err)
 386                 return err;
 387
 388         err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0);
 389         if (err)
 390                 return err;
 391
 392         mdelay(delay);
 393
 394         ds_wait_status(dev, &st);
 395
 396         return err;
 397 }
 398
 399 int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 400 {
 401         int err, count;
 402         struct ds_status st;
 403         u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0);
 404         u16 cmd;
 405
 406         err = ds_send_control(dev, value, 0);
 407         if (err)
 408                 return err;
 409
 410         count = 0;
 411         do {
 412                 err = ds_wait_status(dev, &st);
 413                 if (err)
 414                         return err;
 415
 416                 cmd = st.command0 | (st.command1 << 8);
 417         } while (cmd != value && ++count < 10);
 418
 419         if (err < 0 || count >= 10) {
 420                 printk(KERN_ERR "Failed to obtain status.\n");
 421                 return -EINVAL;
 422         }
 423
 424         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 425         if (err < 0)
 426                 return err;
 427
 428         return 0;
 429 }
 430
 431 int ds_write_bit(struct ds_device *dev, u8 bit)
 432 {
 433         int err;
 434         struct ds_status st;
 435
 436         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0);
 437         if (err)
 438                 return err;
 439
 440         ds_wait_status(dev, &st);
 441
 442         return 0;
 443 }
 444
 445 int ds_write_byte(struct ds_device *dev, u8 byte)
 446 {
 447         int err;
 448         struct ds_status st;
 449         u8 rbyte;
 450
 451         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
 452         if (err)
 453                 return err;
 454
 455         err = ds_wait_status(dev, &st);
 456         if (err)
 457                 return err;
 458
 459         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 460         if (err < 0)
 461                 return err;
 462
 463         ds_start_pulse(dev, PULLUP_PULSE_DURATION);
 464
 465         return !(byte == rbyte);
 466 }
 467
 468 int ds_read_bit(struct ds_device *dev, u8 *bit)
 469 {
 470         int err;
 471
 472         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
 473         if (err)
 474                 return err;
 475
 476         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_SPU | COMM_D, 0);
 477         if (err)
 478                 return err;
 479
 480         err = ds_recv_data(dev, bit, sizeof(*bit));
 481         if (err < 0)
 482                 return err;
 483
 484         return 0;
 485 }
 486
 487 int ds_read_byte(struct ds_device *dev, u8 *byte)
 488 {
 489         int err;
 490         struct ds_status st;
 491
 492         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 493         if (err)
 494                 return err;
 495
 496         ds_wait_status(dev, &st);
 497
 498         err = ds_recv_data(dev, byte, sizeof(*byte));
 499         if (err < 0)
 500                 return err;
 501
 502         return 0;
 503 }
 504
 505 int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 506 {
 507         struct ds_status st;
 508         int err;
 509
 510         if (len > 64*1024)
 511                 return -E2BIG;
 512
 513         memset(buf, 0xFF, len);
 514
 515         err = ds_send_data(dev, buf, len);
 516         if (err < 0)
 517                 return err;
 518
 519         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
 520         if (err)
 521                 return err;
 522
 523         ds_wait_status(dev, &st);
 524
 525         memset(buf, 0x00, len);
 526         err = ds_recv_data(dev, buf, len);
 527
 528         return err;
 529 }
 530
 531 int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 532 {
 533         int err;
 534         struct ds_status st;
 535
 536         err = ds_send_data(dev, buf, len);
 537         if (err < 0)
 538                 return err;
 539
 540         ds_wait_status(dev, &st);
 541
 542         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
 543         if (err)
 544                 return err;
 545
 546         ds_wait_status(dev, &st);
 547
 548         err = ds_recv_data(dev, buf, len);
 549         if (err < 0)
 550                 return err;
 551
 552         ds_start_pulse(dev, PULLUP_PULSE_DURATION);
 553
 554         return !(err == len);
 555 }
 556
 557 #if 0
 558
 559 int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
 560 {
 561         int err;
 562         u16 value, index;
 563         struct ds_status st;
 564
 565         memset(buf, 0, sizeof(buf));
 566
 567         err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
 568         if (err)
 569                 return err;
 570
 571         ds_wait_status(ds_dev, &st);
 572
 573         value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
 574         index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
 575         err = ds_send_control(ds_dev, value, index);
 576         if (err)
 577                 return err;
 578
 579         ds_wait_status(ds_dev, &st);
 580
 581         err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
 582         if (err < 0)
 583                 return err;
 584
 585         return err/8;
 586 }
 587
 588 int ds_match_access(struct ds_device *dev, u64 init)
 589 {
 590         int err;
 591         struct ds_status st;
 592
 593         err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
 594         if (err)
 595                 return err;
 596
 597         ds_wait_status(dev, &st);
 598
 599         err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
 600         if (err)
 601                 return err;
 602
 603         ds_wait_status(dev, &st);
 604
 605         return 0;
 606 }
 607
 608 int ds_set_path(struct ds_device *dev, u64 init)
 609 {
 610         int err;
 611         struct ds_status st;
 612         u8 buf[9];
 613
 614         memcpy(buf, &init, 8);
 615         buf[8] = BRANCH_MAIN;
 616
 617         err = ds_send_data(dev, buf, sizeof(buf));
 618         if (err)
 619                 return err;
 620
 621         ds_wait_status(dev, &st);
 622
 623         err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
 624         if (err)
 625                 return err;
 626
 627         ds_wait_status(dev, &st);
 628
 629         return 0;
 630 }
 631
 632 #endif  /*  0  */
 633
 634 static int ds_probe(struct usb_interface *intf,
 635                     const struct usb_device_id *udev_id)
 636 {
 637         struct usb_device *udev = interface_to_usbdev(intf);
 638         struct usb_endpoint_descriptor *endpoint;
 639         struct usb_host_interface *iface_desc;
 640         int i, err;
 641
 642         ds_dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 643         if (!ds_dev) {
 644                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 645                 return -ENOMEM;
 646         }
 647
 648         ds_dev->udev = usb_get_dev(udev);
 649         usb_set_intfdata(intf, ds_dev);
 650
 651         err = usb_set_interface(ds_dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 652         if (err) {
 653                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 654                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 655                 return err;
 656         }
 657
 658         err = usb_reset_configuration(ds_dev->udev);
 659         if (err) {
 660                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 661                 return err;
 662         }
 663
 664         iface_desc = &intf->altsetting[0];
 665         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 666                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 667                 return -ENODEV;
 668         }
 669
 670         atomic_set(&ds_dev->refcnt, 0);
 671         memset(ds_dev->ep, 0, sizeof(ds_dev->ep));
 672
 673         /*
 674          * This loop doesn'd show control 0 endpoint,
 675          * so we will fill only 1-3 endpoints entry.
 676          */
 677         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 678                 endpoint = &iface_desc->endpoint[i].desc;
 679
 680                 ds_dev->ep[i+1] = endpoint->bEndpointAddress;
 681
 682                 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
 683                         i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
 684                         (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
 685                         endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 686         }
 687
 688 #if 0
 689         {
 690                 int err, i;
 691                 u64 buf[3];
 692                 u64 init=0xb30000002078ee81ull;
 693                 struct ds_status st;
 694
 695                 ds_reset(ds_dev, &st);
 696                 err = ds_search(ds_dev, init, buf, 3, 0);
 697                 if (err < 0)
 698                         return err;
 699                 for (i=0; i<err; ++i)
 700                         printk("%d: %llx\n", i, buf[i]);
 701
 702                 printk("Resetting...\n");
 703                 ds_reset(ds_dev, &st);
 704                 printk("Setting path for %llx.\n", init);
 705                 err = ds_set_path(ds_dev, init);
 706                 if (err)
 707                         return err;
 708                 printk("Calling MATCH_ACCESS.\n");
 709                 err = ds_match_access(ds_dev, init);
 710                 if (err)
 711                         return err;
 712
 713                 printk("Searching the bus...\n");
 714                 err = ds_search(ds_dev, init, buf, 3, 0);
 715
 716                 printk("ds_search() returned %d\n", err);
 717
 718                 if (err < 0)
 719                         return err;
 720                 for (i=0; i<err; ++i)
 721                         printk("%d: %llx\n", i, buf[i]);
 722
 723                 return 0;
 724         }
 725 #endif
 726
 727         return 0;
 728 }
 729
 730 static void ds_disconnect(struct usb_interface *intf)
 731 {
 732         struct ds_device *dev;
 733
 734         dev = usb_get_intfdata(intf);
 735         usb_set_intfdata(intf, NULL);
 736
 737         while (atomic_read(&dev->refcnt)) {
 738                 printk(KERN_INFO "Waiting for DS to become free: refcnt=%d.\n",
 739                                 atomic_read(&dev->refcnt));
 740
 741                 if (msleep_interruptible(1000))
 742                         flush_signals(current);
 743         }
 744
 745         usb_put_dev(dev->udev);
 746         kfree(dev);
 747         ds_dev = NULL;
 748 }
 749
 750 static int ds_init(void)
 751 {
 752         int err;
 753
 754         err = usb_register(&ds_driver);
 755         if (err) {
 756                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
 757                 return err;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static void ds_fini(void)
 764 {
 765         usb_deregister(&ds_driver);
 766 }
 767
 768 module_init(ds_init);
 769 module_exit(ds_fini);
 770
 771 MODULE_LICENSE("GPL");
 772 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
 773
 774 EXPORT_SYMBOL(ds_touch_bit);
 775 EXPORT_SYMBOL(ds_read_byte);
 776 EXPORT_SYMBOL(ds_read_bit);
 777 EXPORT_SYMBOL(ds_read_block);
 778 EXPORT_SYMBOL(ds_write_byte);
 779 EXPORT_SYMBOL(ds_write_bit);
 780 EXPORT_SYMBOL(ds_write_block);
 781 EXPORT_SYMBOL(ds_reset);
 782 EXPORT_SYMBOL(ds_get_device);
 783 EXPORT_SYMBOL(ds_put_device);
 784
 785 /*
 786  * This functions can be used for EEPROM programming,
 787  * when driver will be included into mainline this will
 788  * require uncommenting.
 789  */
 790 #if 0
 791 EXPORT_SYMBOL(ds_start_pulse);
 792 EXPORT_SYMBOL(ds_set_speed);
 793 EXPORT_SYMBOL(ds_detect);
 794 EXPORT_SYMBOL(ds_stop_pulse);
 795 EXPORT_SYMBOL(ds_search);
 796 #endif