drivers/w1/masters/ds2490.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 "../w1_int.h"
  28 #include "../w1.h"
  29
  30 /* COMMAND TYPE CODES */
  31 #define CONTROL_CMD                     0x00
  32 #define COMM_CMD                        0x01
  33 #define MODE_CMD                        0x02
  34
  35 /* CONTROL COMMAND CODES */
  36 #define CTL_RESET_DEVICE                0x0000
  37 #define CTL_START_EXE                   0x0001
  38 #define CTL_RESUME_EXE                  0x0002
  39 #define CTL_HALT_EXE_IDLE               0x0003
  40 #define CTL_HALT_EXE_DONE               0x0004
  41 #define CTL_FLUSH_COMM_CMDS             0x0007
  42 #define CTL_FLUSH_RCV_BUFFER            0x0008
  43 #define CTL_FLUSH_XMT_BUFFER            0x0009
  44 #define CTL_GET_COMM_CMDS               0x000A
  45
  46 /* MODE COMMAND CODES */
  47 #define MOD_PULSE_EN                    0x0000
  48 #define MOD_SPEED_CHANGE_EN             0x0001
  49 #define MOD_1WIRE_SPEED                 0x0002
  50 #define MOD_STRONG_PU_DURATION          0x0003
  51 #define MOD_PULLDOWN_SLEWRATE           0x0004
  52 #define MOD_PROG_PULSE_DURATION         0x0005
  53 #define MOD_WRITE1_LOWTIME              0x0006
  54 #define MOD_DSOW0_TREC                  0x0007
  55
  56 /* COMMUNICATION COMMAND CODES */
  57 #define COMM_ERROR_ESCAPE               0x0601
  58 #define COMM_SET_DURATION               0x0012
  59 #define COMM_BIT_IO                     0x0020
  60 #define COMM_PULSE                      0x0030
  61 #define COMM_1_WIRE_RESET               0x0042
  62 #define COMM_BYTE_IO                    0x0052
  63 #define COMM_MATCH_ACCESS               0x0064
  64 #define COMM_BLOCK_IO                   0x0074
  65 #define COMM_READ_STRAIGHT              0x0080
  66 #define COMM_DO_RELEASE                 0x6092
  67 #define COMM_SET_PATH                   0x00A2
  68 #define COMM_WRITE_SRAM_PAGE            0x00B2
  69 #define COMM_WRITE_EPROM                0x00C4
  70 #define COMM_READ_CRC_PROT_PAGE         0x00D4
  71 #define COMM_READ_REDIRECT_PAGE_CRC     0x21E4
  72 #define COMM_SEARCH_ACCESS              0x00F4
  73
  74 /* Communication command bits */
  75 #define COMM_TYPE                       0x0008
  76 #define COMM_SE                         0x0008
  77 #define COMM_D                          0x0008
  78 #define COMM_Z                          0x0008
  79 #define COMM_CH                         0x0008
  80 #define COMM_SM                         0x0008
  81 #define COMM_R                          0x0008
  82 #define COMM_IM                         0x0001
  83
  84 #define COMM_PS                         0x4000
  85 #define COMM_PST                        0x4000
  86 #define COMM_CIB                        0x4000
  87 #define COMM_RTS                        0x4000
  88 #define COMM_DT                         0x2000
  89 #define COMM_SPU                        0x1000
  90 #define COMM_F                          0x0800
  91 #define COMM_NTP                        0x0400
  92 #define COMM_ICP                        0x0200
  93 #define COMM_RST                        0x0100
  94
  95 #define PULSE_PROG                      0x01
  96 #define PULSE_SPUE                      0x02
  97
  98 #define BRANCH_MAIN                     0xCC
  99 #define BRANCH_AUX                      0x33
 100
 101 /*
 102  * Duration of the strong pull-up pulse in milliseconds.
 103  */
 104 #define PULLUP_PULSE_DURATION           750
 105
 106 /* Status flags */
 107 #define ST_SPUA                         0x01  /* Strong Pull-up is active */
 108 #define ST_PRGA                         0x02  /* 12V programming pulse is being generated */
 109 #define ST_12VP                         0x04  /* external 12V programming voltage is present */
 110 #define ST_PMOD                         0x08  /* DS2490 powered from USB and external sources */
 111 #define ST_HALT                         0x10  /* DS2490 is currently halted */
 112 #define ST_IDLE                         0x20  /* DS2490 is currently idle */
 113 #define ST_EPOF                         0x80
 114
 115 #define SPEED_NORMAL                    0x00
 116 #define SPEED_FLEXIBLE                  0x01
 117 #define SPEED_OVERDRIVE                 0x02
 118
 119 #define NUM_EP                          4
 120 #define EP_CONTROL                      0
 121 #define EP_STATUS                       1
 122 #define EP_DATA_OUT                     2
 123 #define EP_DATA_IN                      3
 124
 125 struct ds_device
 126 {
 127         struct list_head        ds_entry;
 128
 129         struct usb_device       *udev;
 130         struct usb_interface    *intf;
 131
 132         int                     ep[NUM_EP];
 133
 134         struct w1_bus_master    master;
 135 };
 136
 137 struct ds_status
 138 {
 139         u8                      enable;
 140         u8                      speed;
 141         u8                      pullup_dur;
 142         u8                      ppuls_dur;
 143         u8                      pulldown_slew;
 144         u8                      write1_time;
 145         u8                      write0_time;
 146         u8                      reserved0;
 147         u8                      status;
 148         u8                      command0;
 149         u8                      command1;
 150         u8                      command_buffer_status;
 151         u8                      data_out_buffer_status;
 152         u8                      data_in_buffer_status;
 153         u8                      reserved1;
 154         u8                      reserved2;
 155
 156 };
 157
 158 static struct usb_device_id ds_id_table [] = {
 159         { USB_DEVICE(0x04fa, 0x2490) },
 160         { },
 161 };
 162 MODULE_DEVICE_TABLE(usb, ds_id_table);
 163
 164 static int ds_probe(struct usb_interface *, const struct usb_device_id *);
 165 static void ds_disconnect(struct usb_interface *);
 166
 167 static inline void ds_dump_status(unsigned char *, unsigned char *, int);
 168 static int ds_send_control(struct ds_device *, u16, u16);
 169 static int ds_send_control_cmd(struct ds_device *, u16, u16);
 170
 171 static LIST_HEAD(ds_devices);
 172 static DEFINE_MUTEX(ds_mutex);
 173
 174 static struct usb_driver ds_driver = {
 175         .name =         "DS9490R",
 176         .probe =        ds_probe,
 177         .disconnect =   ds_disconnect,
 178         .id_table =     ds_id_table,
 179 };
 180
 181 static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
 182 {
 183         int err;
 184
 185         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 186                         CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
 187         if (err < 0) {
 188                 printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
 189                                 value, index, err);
 190                 return err;
 191         }
 192
 193         return err;
 194 }
 195 #if 0
 196 static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
 197 {
 198         int err;
 199
 200         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 201                         MODE_CMD, 0x40, value, index, NULL, 0, 1000);
 202         if (err < 0) {
 203                 printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
 204                                 value, index, err);
 205                 return err;
 206         }
 207
 208         return err;
 209 }
 210 #endif
 211 static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
 212 {
 213         int err;
 214
 215         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 216                         COMM_CMD, 0x40, value, index, NULL, 0, 1000);
 217         if (err < 0) {
 218                 printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
 219                                 value, index, err);
 220                 return err;
 221         }
 222
 223         return err;
 224 }
 225
 226 static inline void ds_dump_status(unsigned char *buf, unsigned char *str, int off)
 227 {
 228         printk("%45s: %8x\n", str, buf[off]);
 229 }
 230
 231 static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
 232                                  unsigned char *buf, int size)
 233 {
 234         int count, err;
 235
 236         memset(st, 0, sizeof(*st));
 237
 238         count = 0;
 239         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
 240         if (err < 0) {
 241                 printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
 242                 return err;
 243         }
 244
 245         if (count >= sizeof(*st))
 246                 memcpy(st, buf, sizeof(*st));
 247
 248         return count;
 249 }
 250
 251 static int ds_recv_status(struct ds_device *dev, struct ds_status *st)
 252 {
 253         unsigned char buf[64];
 254         int count, err = 0, i;
 255
 256         memcpy(st, buf, sizeof(*st));
 257
 258         count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 259         if (count < 0)
 260                 return err;
 261
 262         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
 263         for (i=0; i<count; ++i)
 264                 printk("%02x ", buf[i]);
 265         printk("\n");
 266
 267         if (count >= 16) {
 268                 ds_dump_status(buf, "enable flag", 0);
 269                 ds_dump_status(buf, "1-wire speed", 1);
 270                 ds_dump_status(buf, "strong pullup duration", 2);
 271                 ds_dump_status(buf, "programming pulse duration", 3);
 272                 ds_dump_status(buf, "pulldown slew rate control", 4);
 273                 ds_dump_status(buf, "write-1 low time", 5);
 274                 ds_dump_status(buf, "data sample offset/write-0 recovery time", 6);
 275                 ds_dump_status(buf, "reserved (test register)", 7);
 276                 ds_dump_status(buf, "device status flags", 8);
 277                 ds_dump_status(buf, "communication command byte 1", 9);
 278                 ds_dump_status(buf, "communication command byte 2", 10);
 279                 ds_dump_status(buf, "communication command buffer status", 11);
 280                 ds_dump_status(buf, "1-wire data output buffer status", 12);
 281                 ds_dump_status(buf, "1-wire data input buffer status", 13);
 282                 ds_dump_status(buf, "reserved", 14);
 283                 ds_dump_status(buf, "reserved", 15);
 284         }
 285
 286         memcpy(st, buf, sizeof(*st));
 287
 288         if (st->status & ST_EPOF) {
 289                 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
 290                 err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 291                 if (err)
 292                         return err;
 293                 count = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 294                 if (count < 0)
 295                         return err;
 296         }
 297 #if 0
 298         if (st->status & ST_IDLE) {
 299                 printk(KERN_INFO "Resetting pulse after ST_IDLE.\n");
 300                 err = ds_start_pulse(dev, PULLUP_PULSE_DURATION);
 301                 if (err)
 302                         return err;
 303         }
 304 #endif
 305
 306         return err;
 307 }
 308
 309 static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
 310 {
 311         int count, err;
 312         struct ds_status st;
 313
 314         count = 0;
 315         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
 316                                 buf, size, &count, 1000);
 317         if (err < 0) {
 318                 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
 319                 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
 320                 ds_recv_status(dev, &st);
 321                 return err;
 322         }
 323
 324 #if 0
 325         {
 326                 int i;
 327
 328                 printk("%s: count=%d: ", __func__, count);
 329                 for (i=0; i<count; ++i)
 330                         printk("%02x ", buf[i]);
 331                 printk("\n");
 332         }
 333 #endif
 334         return count;
 335 }
 336
 337 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 338 {
 339         int count, err;
 340
 341         count = 0;
 342         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 343         if (err < 0) {
 344                 printk(KERN_ERR "Failed to read 1-wire data from 0x02: err=%d.\n", err);
 345                 return err;
 346         }
 347
 348         return err;
 349 }
 350
 351 #if 0
 352
 353 int ds_stop_pulse(struct ds_device *dev, int limit)
 354 {
 355         struct ds_status st;
 356         int count = 0, err = 0;
 357         u8 buf[0x20];
 358
 359         do {
 360                 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
 361                 if (err)
 362                         break;
 363                 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
 364                 if (err)
 365                         break;
 366                 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 367                 if (err)
 368                         break;
 369
 370                 if ((st.status & ST_SPUA) == 0) {
 371                         err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
 372                         if (err)
 373                                 break;
 374                 }
 375         } while(++count < limit);
 376
 377         return err;
 378 }
 379
 380 int ds_detect(struct ds_device *dev, struct ds_status *st)
 381 {
 382         int err;
 383
 384         err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 385         if (err)
 386                 return err;
 387
 388         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
 389         if (err)
 390                 return err;
 391
 392         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
 393         if (err)
 394                 return err;
 395
 396         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
 397         if (err)
 398                 return err;
 399
 400         err = ds_recv_status(dev, st);
 401
 402         return err;
 403 }
 404
 405 #endif  /*  0  */
 406
 407 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 408 {
 409         u8 buf[0x20];
 410         int err, count = 0;
 411
 412         do {
 413                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 414 #if 0
 415                 if (err >= 0) {
 416                         int i;
 417                         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
 418                         for (i=0; i<err; ++i)
 419                                 printk("%02x ", buf[i]);
 420                         printk("\n");
 421                 }
 422 #endif
 423         } while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);
 424
 425
 426         if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) {
 427                 ds_recv_status(dev, st);
 428                 return -1;
 429         } else
 430                 return 0;
 431 }
 432
 433 static int ds_reset(struct ds_device *dev, struct ds_status *st)
 434 {
 435         int err;
 436
 437         //err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_F | COMM_IM | COMM_SE, SPEED_FLEXIBLE);
 438         err = ds_send_control(dev, 0x43, SPEED_NORMAL);
 439         if (err)
 440                 return err;
 441
 442         ds_wait_status(dev, st);
 443 #if 0
 444         if (st->command_buffer_status) {
 445                 printk(KERN_INFO "Short circuit.\n");
 446                 return -EIO;
 447         }
 448 #endif
 449
 450         return 0;
 451 }
 452
 453 #if 0
 454 static int ds_set_speed(struct ds_device *dev, int speed)
 455 {
 456         int err;
 457
 458         if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
 459                 return -EINVAL;
 460
 461         if (speed != SPEED_OVERDRIVE)
 462                 speed = SPEED_FLEXIBLE;
 463
 464         speed &= 0xff;
 465
 466         err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
 467         if (err)
 468                 return err;
 469
 470         return err;
 471 }
 472 #endif  /*  0  */
 473
 474 static int ds_start_pulse(struct ds_device *dev, int delay)
 475 {
 476         int err;
 477         u8 del = 1 + (u8)(delay >> 4);
 478         struct ds_status st;
 479
 480 #if 0
 481         err = ds_stop_pulse(dev, 10);
 482         if (err)
 483                 return err;
 484
 485         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
 486         if (err)
 487                 return err;
 488 #endif
 489         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 490         if (err)
 491                 return err;
 492
 493         err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0);
 494         if (err)
 495                 return err;
 496
 497         mdelay(delay);
 498
 499         ds_wait_status(dev, &st);
 500
 501         return err;
 502 }
 503
 504 static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 505 {
 506         int err, count;
 507         struct ds_status st;
 508         u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0);
 509         u16 cmd;
 510
 511         err = ds_send_control(dev, value, 0);
 512         if (err)
 513                 return err;
 514
 515         count = 0;
 516         do {
 517                 err = ds_wait_status(dev, &st);
 518                 if (err)
 519                         return err;
 520
 521                 cmd = st.command0 | (st.command1 << 8);
 522         } while (cmd != value && ++count < 10);
 523
 524         if (err < 0 || count >= 10) {
 525                 printk(KERN_ERR "Failed to obtain status.\n");
 526                 return -EINVAL;
 527         }
 528
 529         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 530         if (err < 0)
 531                 return err;
 532
 533         return 0;
 534 }
 535
 536 static int ds_write_bit(struct ds_device *dev, u8 bit)
 537 {
 538         int err;
 539         struct ds_status st;
 540
 541         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0);
 542         if (err)
 543                 return err;
 544
 545         ds_wait_status(dev, &st);
 546
 547         return 0;
 548 }
 549
 550 static int ds_write_byte(struct ds_device *dev, u8 byte)
 551 {
 552         int err;
 553         struct ds_status st;
 554         u8 rbyte;
 555
 556         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
 557         if (err)
 558                 return err;
 559
 560         err = ds_wait_status(dev, &st);
 561         if (err)
 562                 return err;
 563
 564         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 565         if (err < 0)
 566                 return err;
 567
 568         ds_start_pulse(dev, PULLUP_PULSE_DURATION);
 569
 570         return !(byte == rbyte);
 571 }
 572
 573 static int ds_read_byte(struct ds_device *dev, u8 *byte)
 574 {
 575         int err;
 576         struct ds_status st;
 577
 578         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 579         if (err)
 580                 return err;
 581
 582         ds_wait_status(dev, &st);
 583
 584         err = ds_recv_data(dev, byte, sizeof(*byte));
 585         if (err < 0)
 586                 return err;
 587
 588         return 0;
 589 }
 590
 591 static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 592 {
 593         struct ds_status st;
 594         int err;
 595
 596         if (len > 64*1024)
 597                 return -E2BIG;
 598
 599         memset(buf, 0xFF, len);
 600
 601         err = ds_send_data(dev, buf, len);
 602         if (err < 0)
 603                 return err;
 604
 605         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
 606         if (err)
 607                 return err;
 608
 609         ds_wait_status(dev, &st);
 610
 611         memset(buf, 0x00, len);
 612         err = ds_recv_data(dev, buf, len);
 613
 614         return err;
 615 }
 616
 617 static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 618 {
 619         int err;
 620         struct ds_status st;
 621
 622         err = ds_send_data(dev, buf, len);
 623         if (err < 0)
 624                 return err;
 625
 626         ds_wait_status(dev, &st);
 627
 628         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
 629         if (err)
 630                 return err;
 631
 632         ds_wait_status(dev, &st);
 633
 634         err = ds_recv_data(dev, buf, len);
 635         if (err < 0)
 636                 return err;
 637
 638         ds_start_pulse(dev, PULLUP_PULSE_DURATION);
 639
 640         return !(err == len);
 641 }
 642
 643 #if 0
 644
 645 static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
 646 {
 647         int err;
 648         u16 value, index;
 649         struct ds_status st;
 650
 651         memset(buf, 0, sizeof(buf));
 652
 653         err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
 654         if (err)
 655                 return err;
 656
 657         ds_wait_status(ds_dev, &st);
 658
 659         value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
 660         index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
 661         err = ds_send_control(ds_dev, value, index);
 662         if (err)
 663                 return err;
 664
 665         ds_wait_status(ds_dev, &st);
 666
 667         err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
 668         if (err < 0)
 669                 return err;
 670
 671         return err/8;
 672 }
 673
 674 static int ds_match_access(struct ds_device *dev, u64 init)
 675 {
 676         int err;
 677         struct ds_status st;
 678
 679         err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
 680         if (err)
 681                 return err;
 682
 683         ds_wait_status(dev, &st);
 684
 685         err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
 686         if (err)
 687                 return err;
 688
 689         ds_wait_status(dev, &st);
 690
 691         return 0;
 692 }
 693
 694 static int ds_set_path(struct ds_device *dev, u64 init)
 695 {
 696         int err;
 697         struct ds_status st;
 698         u8 buf[9];
 699
 700         memcpy(buf, &init, 8);
 701         buf[8] = BRANCH_MAIN;
 702
 703         err = ds_send_data(dev, buf, sizeof(buf));
 704         if (err)
 705                 return err;
 706
 707         ds_wait_status(dev, &st);
 708
 709         err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
 710         if (err)
 711                 return err;
 712
 713         ds_wait_status(dev, &st);
 714
 715         return 0;
 716 }
 717
 718 #endif  /*  0  */
 719
 720 static u8 ds9490r_touch_bit(void *data, u8 bit)
 721 {
 722         u8 ret;
 723         struct ds_device *dev = data;
 724
 725         if (ds_touch_bit(dev, bit, &ret))
 726                 return 0;
 727
 728         return ret;
 729 }
 730
 731 static void ds9490r_write_bit(void *data, u8 bit)
 732 {
 733         struct ds_device *dev = data;
 734
 735         ds_write_bit(dev, bit);
 736 }
 737
 738 static void ds9490r_write_byte(void *data, u8 byte)
 739 {
 740         struct ds_device *dev = data;
 741
 742         ds_write_byte(dev, byte);
 743 }
 744
 745 static u8 ds9490r_read_bit(void *data)
 746 {
 747         struct ds_device *dev = data;
 748         int err;
 749         u8 bit = 0;
 750
 751         err = ds_touch_bit(dev, 1, &bit);
 752         if (err)
 753                 return 0;
 754
 755         return bit & 1;
 756 }
 757
 758 static u8 ds9490r_read_byte(void *data)
 759 {
 760         struct ds_device *dev = data;
 761         int err;
 762         u8 byte = 0;
 763
 764         err = ds_read_byte(dev, &byte);
 765         if (err)
 766                 return 0;
 767
 768         return byte;
 769 }
 770
 771 static void ds9490r_write_block(void *data, const u8 *buf, int len)
 772 {
 773         struct ds_device *dev = data;
 774
 775         ds_write_block(dev, (u8 *)buf, len);
 776 }
 777
 778 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
 779 {
 780         struct ds_device *dev = data;
 781         int err;
 782
 783         err = ds_read_block(dev, buf, len);
 784         if (err < 0)
 785                 return 0;
 786
 787         return len;
 788 }
 789
 790 static u8 ds9490r_reset(void *data)
 791 {
 792         struct ds_device *dev = data;
 793         struct ds_status st;
 794         int err;
 795
 796         memset(&st, 0, sizeof(st));
 797
 798         err = ds_reset(dev, &st);
 799         if (err)
 800                 return 1;
 801
 802         return 0;
 803 }
 804
 805 static int ds_w1_init(struct ds_device *dev)
 806 {
 807         memset(&dev->master, 0, sizeof(struct w1_bus_master));
 808
 809         dev->master.data        = dev;
 810         dev->master.touch_bit   = &ds9490r_touch_bit;
 811         dev->master.read_bit    = &ds9490r_read_bit;
 812         dev->master.write_bit   = &ds9490r_write_bit;
 813         dev->master.read_byte   = &ds9490r_read_byte;
 814         dev->master.write_byte  = &ds9490r_write_byte;
 815         dev->master.read_block  = &ds9490r_read_block;
 816         dev->master.write_block = &ds9490r_write_block;
 817         dev->master.reset_bus   = &ds9490r_reset;
 818
 819         return w1_add_master_device(&dev->master);
 820 }
 821
 822 static void ds_w1_fini(struct ds_device *dev)
 823 {
 824         w1_remove_master_device(&dev->master);
 825 }
 826
 827 static int ds_probe(struct usb_interface *intf,
 828                     const struct usb_device_id *udev_id)
 829 {
 830         struct usb_device *udev = interface_to_usbdev(intf);
 831         struct usb_endpoint_descriptor *endpoint;
 832         struct usb_host_interface *iface_desc;
 833         struct ds_device *dev;
 834         int i, err;
 835
 836         dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 837         if (!dev) {
 838                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 839                 return -ENOMEM;
 840         }
 841         dev->udev = usb_get_dev(udev);
 842         if (!dev->udev) {
 843                 err = -ENOMEM;
 844                 goto err_out_free;
 845         }
 846         memset(dev->ep, 0, sizeof(dev->ep));
 847
 848         usb_set_intfdata(intf, dev);
 849
 850         err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 851         if (err) {
 852                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 853                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 854                 goto err_out_clear;
 855         }
 856
 857         err = usb_reset_configuration(dev->udev);
 858         if (err) {
 859                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 860                 goto err_out_clear;
 861         }
 862
 863         iface_desc = &intf->altsetting[0];
 864         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 865                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 866                 err = -EINVAL;
 867                 goto err_out_clear;
 868         }
 869
 870         /*
 871          * This loop doesn'd show control 0 endpoint,
 872          * so we will fill only 1-3 endpoints entry.
 873          */
 874         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 875                 endpoint = &iface_desc->endpoint[i].desc;
 876
 877                 dev->ep[i+1] = endpoint->bEndpointAddress;
 878 #if 0
 879                 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
 880                         i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
 881                         (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
 882                         endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 883 #endif
 884         }
 885
 886         err = ds_w1_init(dev);
 887         if (err)
 888                 goto err_out_clear;
 889
 890         mutex_lock(&ds_mutex);
 891         list_add_tail(&dev->ds_entry, &ds_devices);
 892         mutex_unlock(&ds_mutex);
 893
 894         return 0;
 895
 896 err_out_clear:
 897         usb_set_intfdata(intf, NULL);
 898         usb_put_dev(dev->udev);
 899 err_out_free:
 900         kfree(dev);
 901         return err;
 902 }
 903
 904 static void ds_disconnect(struct usb_interface *intf)
 905 {
 906         struct ds_device *dev;
 907
 908         dev = usb_get_intfdata(intf);
 909         if (!dev)
 910                 return;
 911
 912         mutex_lock(&ds_mutex);
 913         list_del(&dev->ds_entry);
 914         mutex_unlock(&ds_mutex);
 915
 916         ds_w1_fini(dev);
 917
 918         usb_set_intfdata(intf, NULL);
 919
 920         usb_put_dev(dev->udev);
 921         kfree(dev);
 922 }
 923
 924 static int ds_init(void)
 925 {
 926         int err;
 927
 928         err = usb_register(&ds_driver);
 929         if (err) {
 930                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
 931                 return err;
 932         }
 933
 934         return 0;
 935 }
 936
 937 static void ds_fini(void)
 938 {
 939         usb_deregister(&ds_driver);
 940 }
 941
 942 module_init(ds_init);
 943 module_exit(ds_fini);
 944
 945 MODULE_LICENSE("GPL");
 946 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
 947 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");