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