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 /* Status flags */
 102 #define ST_SPUA                         0x01  /* Strong Pull-up is active */
 103 #define ST_PRGA                         0x02  /* 12V programming pulse is being generated */
 104 #define ST_12VP                         0x04  /* external 12V programming voltage is present */
 105 #define ST_PMOD                         0x08  /* DS2490 powered from USB and external sources */
 106 #define ST_HALT                         0x10  /* DS2490 is currently halted */
 107 #define ST_IDLE                         0x20  /* DS2490 is currently idle */
 108 #define ST_EPOF                         0x80
 109
 110 #define SPEED_NORMAL                    0x00
 111 #define SPEED_FLEXIBLE                  0x01
 112 #define SPEED_OVERDRIVE                 0x02
 113
 114 #define NUM_EP                          4
 115 #define EP_CONTROL                      0
 116 #define EP_STATUS                       1
 117 #define EP_DATA_OUT                     2
 118 #define EP_DATA_IN                      3
 119
 120 struct ds_device
 121 {
 122         struct list_head        ds_entry;
 123
 124         struct usb_device       *udev;
 125         struct usb_interface    *intf;
 126
 127         int                     ep[NUM_EP];
 128
 129         /* Strong PullUp
 130          * 0: pullup not active, else duration in milliseconds
 131          */
 132         int                     spu_sleep;
 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
 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
 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
 298         return err;
 299 }
 300
 301 static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
 302 {
 303         int count, err;
 304         struct ds_status st;
 305
 306         count = 0;
 307         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
 308                                 buf, size, &count, 1000);
 309         if (err < 0) {
 310                 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
 311                 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
 312                 ds_recv_status(dev, &st);
 313                 return err;
 314         }
 315
 316 #if 0
 317         {
 318                 int i;
 319
 320                 printk("%s: count=%d: ", __func__, count);
 321                 for (i=0; i<count; ++i)
 322                         printk("%02x ", buf[i]);
 323                 printk("\n");
 324         }
 325 #endif
 326         return count;
 327 }
 328
 329 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 330 {
 331         int count, err;
 332
 333         count = 0;
 334         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 335         if (err < 0) {
 336                 printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: "
 337                         "err=%d.\n", dev->ep[EP_DATA_OUT], err);
 338                 return err;
 339         }
 340
 341         return err;
 342 }
 343
 344 #if 0
 345
 346 int ds_stop_pulse(struct ds_device *dev, int limit)
 347 {
 348         struct ds_status st;
 349         int count = 0, err = 0;
 350         u8 buf[0x20];
 351
 352         do {
 353                 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
 354                 if (err)
 355                         break;
 356                 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
 357                 if (err)
 358                         break;
 359                 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 360                 if (err)
 361                         break;
 362
 363                 if ((st.status & ST_SPUA) == 0) {
 364                         err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
 365                         if (err)
 366                                 break;
 367                 }
 368         } while(++count < limit);
 369
 370         return err;
 371 }
 372
 373 int ds_detect(struct ds_device *dev, struct ds_status *st)
 374 {
 375         int err;
 376
 377         err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 378         if (err)
 379                 return err;
 380
 381         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
 382         if (err)
 383                 return err;
 384
 385         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
 386         if (err)
 387                 return err;
 388
 389         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
 390         if (err)
 391                 return err;
 392
 393         err = ds_recv_status(dev, st);
 394
 395         return err;
 396 }
 397
 398 #endif  /*  0  */
 399
 400 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 401 {
 402         u8 buf[0x20];
 403         int err, count = 0;
 404
 405         do {
 406                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 407 #if 0
 408                 if (err >= 0) {
 409                         int i;
 410                         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
 411                         for (i=0; i<err; ++i)
 412                                 printk("%02x ", buf[i]);
 413                         printk("\n");
 414                 }
 415 #endif
 416         } while(!(buf[0x08] & 0x20) && !(err < 0) && ++count < 100);
 417
 418
 419         if (((err > 16) && (buf[0x10] & 0x01)) || count >= 100 || err < 0) {
 420                 ds_recv_status(dev, st);
 421                 return -1;
 422         } else
 423                 return 0;
 424 }
 425
 426 static int ds_reset(struct ds_device *dev, struct ds_status *st)
 427 {
 428         int err;
 429
 430         //err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_F | COMM_IM | COMM_SE, SPEED_FLEXIBLE);
 431         err = ds_send_control(dev, 0x43, SPEED_NORMAL);
 432         if (err)
 433                 return err;
 434
 435         ds_wait_status(dev, st);
 436 #if 0
 437         if (st->command_buffer_status) {
 438                 printk(KERN_INFO "Short circuit.\n");
 439                 return -EIO;
 440         }
 441 #endif
 442
 443         return 0;
 444 }
 445
 446 #if 0
 447 static int ds_set_speed(struct ds_device *dev, int speed)
 448 {
 449         int err;
 450
 451         if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
 452                 return -EINVAL;
 453
 454         if (speed != SPEED_OVERDRIVE)
 455                 speed = SPEED_FLEXIBLE;
 456
 457         speed &= 0xff;
 458
 459         err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
 460         if (err)
 461                 return err;
 462
 463         return err;
 464 }
 465 #endif  /*  0  */
 466
 467 static int ds_set_pullup(struct ds_device *dev, int delay)
 468 {
 469         int err;
 470         u8 del = 1 + (u8)(delay >> 4);
 471
 472         dev->spu_sleep = 0;
 473         err = ds_send_control_mode(dev, MOD_PULSE_EN, delay ? PULSE_SPUE : 0);
 474         if (err)
 475                 return err;
 476
 477         if (delay) {
 478                 err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 479                 if (err)
 480                         return err;
 481
 482                 /* Just storing delay would not get the trunication and
 483                  * roundup.
 484                  */
 485                 dev->spu_sleep = del<<4;
 486         }
 487
 488         return err;
 489 }
 490
 491 static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 492 {
 493         int err, count;
 494         struct ds_status st;
 495         u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0);
 496         u16 cmd;
 497
 498         err = ds_send_control(dev, value, 0);
 499         if (err)
 500                 return err;
 501
 502         count = 0;
 503         do {
 504                 err = ds_wait_status(dev, &st);
 505                 if (err)
 506                         return err;
 507
 508                 cmd = st.command0 | (st.command1 << 8);
 509         } while (cmd != value && ++count < 10);
 510
 511         if (err < 0 || count >= 10) {
 512                 printk(KERN_ERR "Failed to obtain status.\n");
 513                 return -EINVAL;
 514         }
 515
 516         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 517         if (err < 0)
 518                 return err;
 519
 520         return 0;
 521 }
 522
 523 #if 0
 524 static int ds_write_bit(struct ds_device *dev, u8 bit)
 525 {
 526         int err;
 527         struct ds_status st;
 528
 529         /* Set COMM_ICP to write without a readback.  Note, this will
 530          * produce one time slot, a down followed by an up with COMM_D
 531          * only determing the timing.
 532          */
 533         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP |
 534                 (bit ? COMM_D : 0), 0);
 535         if (err)
 536                 return err;
 537
 538         ds_wait_status(dev, &st);
 539
 540         return 0;
 541 }
 542 #endif
 543
 544 static int ds_write_byte(struct ds_device *dev, u8 byte)
 545 {
 546         int err;
 547         struct ds_status st;
 548         u8 rbyte;
 549
 550         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
 551         if (err)
 552                 return err;
 553
 554         if (dev->spu_sleep)
 555                 msleep(dev->spu_sleep);
 556
 557         err = ds_wait_status(dev, &st);
 558         if (err)
 559                 return err;
 560
 561         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 562         if (err < 0)
 563                 return err;
 564
 565         return !(byte == rbyte);
 566 }
 567
 568 static int ds_read_byte(struct ds_device *dev, u8 *byte)
 569 {
 570         int err;
 571         struct ds_status st;
 572
 573         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 574         if (err)
 575                 return err;
 576
 577         ds_wait_status(dev, &st);
 578
 579         err = ds_recv_data(dev, byte, sizeof(*byte));
 580         if (err < 0)
 581                 return err;
 582
 583         return 0;
 584 }
 585
 586 static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 587 {
 588         struct ds_status st;
 589         int err;
 590
 591         if (len > 64*1024)
 592                 return -E2BIG;
 593
 594         memset(buf, 0xFF, len);
 595
 596         err = ds_send_data(dev, buf, len);
 597         if (err < 0)
 598                 return err;
 599
 600         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
 601         if (err)
 602                 return err;
 603
 604         ds_wait_status(dev, &st);
 605
 606         memset(buf, 0x00, len);
 607         err = ds_recv_data(dev, buf, len);
 608
 609         return err;
 610 }
 611
 612 static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 613 {
 614         int err;
 615         struct ds_status st;
 616
 617         err = ds_send_data(dev, buf, len);
 618         if (err < 0)
 619                 return err;
 620
 621         ds_wait_status(dev, &st);
 622
 623         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
 624         if (err)
 625                 return err;
 626
 627         if (dev->spu_sleep)
 628                 msleep(dev->spu_sleep);
 629
 630         ds_wait_status(dev, &st);
 631
 632         err = ds_recv_data(dev, buf, len);
 633         if (err < 0)
 634                 return err;
 635
 636         return !(err == len);
 637 }
 638
 639 #if 0
 640
 641 static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
 642 {
 643         int err;
 644         u16 value, index;
 645         struct ds_status st;
 646
 647         memset(buf, 0, sizeof(buf));
 648
 649         err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
 650         if (err)
 651                 return err;
 652
 653         ds_wait_status(ds_dev, &st);
 654
 655         value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
 656         index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
 657         err = ds_send_control(ds_dev, value, index);
 658         if (err)
 659                 return err;
 660
 661         ds_wait_status(ds_dev, &st);
 662
 663         err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
 664         if (err < 0)
 665                 return err;
 666
 667         return err/8;
 668 }
 669
 670 static int ds_match_access(struct ds_device *dev, u64 init)
 671 {
 672         int err;
 673         struct ds_status st;
 674
 675         err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
 676         if (err)
 677                 return err;
 678
 679         ds_wait_status(dev, &st);
 680
 681         err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
 682         if (err)
 683                 return err;
 684
 685         ds_wait_status(dev, &st);
 686
 687         return 0;
 688 }
 689
 690 static int ds_set_path(struct ds_device *dev, u64 init)
 691 {
 692         int err;
 693         struct ds_status st;
 694         u8 buf[9];
 695
 696         memcpy(buf, &init, 8);
 697         buf[8] = BRANCH_MAIN;
 698
 699         err = ds_send_data(dev, buf, sizeof(buf));
 700         if (err)
 701                 return err;
 702
 703         ds_wait_status(dev, &st);
 704
 705         err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
 706         if (err)
 707                 return err;
 708
 709         ds_wait_status(dev, &st);
 710
 711         return 0;
 712 }
 713
 714 #endif  /*  0  */
 715
 716 static u8 ds9490r_touch_bit(void *data, u8 bit)
 717 {
 718         u8 ret;
 719         struct ds_device *dev = data;
 720
 721         if (ds_touch_bit(dev, bit, &ret))
 722                 return 0;
 723
 724         return ret;
 725 }
 726
 727 #if 0
 728 static void ds9490r_write_bit(void *data, u8 bit)
 729 {
 730         struct ds_device *dev = data;
 731
 732         ds_write_bit(dev, bit);
 733 }
 734
 735 static u8 ds9490r_read_bit(void *data)
 736 {
 737         struct ds_device *dev = data;
 738         int err;
 739         u8 bit = 0;
 740
 741         err = ds_touch_bit(dev, 1, &bit);
 742         if (err)
 743                 return 0;
 744
 745         return bit & 1;
 746 }
 747 #endif
 748
 749 static void ds9490r_write_byte(void *data, u8 byte)
 750 {
 751         struct ds_device *dev = data;
 752
 753         ds_write_byte(dev, byte);
 754 }
 755
 756 static u8 ds9490r_read_byte(void *data)
 757 {
 758         struct ds_device *dev = data;
 759         int err;
 760         u8 byte = 0;
 761
 762         err = ds_read_byte(dev, &byte);
 763         if (err)
 764                 return 0;
 765
 766         return byte;
 767 }
 768
 769 static void ds9490r_write_block(void *data, const u8 *buf, int len)
 770 {
 771         struct ds_device *dev = data;
 772
 773         ds_write_block(dev, (u8 *)buf, len);
 774 }
 775
 776 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
 777 {
 778         struct ds_device *dev = data;
 779         int err;
 780
 781         err = ds_read_block(dev, buf, len);
 782         if (err < 0)
 783                 return 0;
 784
 785         return len;
 786 }
 787
 788 static u8 ds9490r_reset(void *data)
 789 {
 790         struct ds_device *dev = data;
 791         struct ds_status st;
 792         int err;
 793
 794         memset(&st, 0, sizeof(st));
 795
 796         err = ds_reset(dev, &st);
 797         if (err)
 798                 return 1;
 799
 800         return 0;
 801 }
 802
 803 static u8 ds9490r_set_pullup(void *data, int delay)
 804 {
 805         struct ds_device *dev = data;
 806
 807         if (ds_set_pullup(dev, delay))
 808                 return 1;
 809
 810         return 0;
 811 }
 812
 813 static int ds_w1_init(struct ds_device *dev)
 814 {
 815         memset(&dev->master, 0, sizeof(struct w1_bus_master));
 816
 817         dev->master.data        = dev;
 818         dev->master.touch_bit   = &ds9490r_touch_bit;
 819         /* read_bit and write_bit in w1_bus_master are expected to set and
 820          * sample the line level.  For write_bit that means it is expected to
 821          * set it to that value and leave it there.  ds2490 only supports an
 822          * individual time slot at the lowest level.  The requirement from
 823          * pulling the bus state down to reading the state is 15us, something
 824          * that isn't realistic on the USB bus anyway.
 825         dev->master.read_bit    = &ds9490r_read_bit;
 826         dev->master.write_bit   = &ds9490r_write_bit;
 827         */
 828         dev->master.read_byte   = &ds9490r_read_byte;
 829         dev->master.write_byte  = &ds9490r_write_byte;
 830         dev->master.read_block  = &ds9490r_read_block;
 831         dev->master.write_block = &ds9490r_write_block;
 832         dev->master.reset_bus   = &ds9490r_reset;
 833         dev->master.set_pullup  = &ds9490r_set_pullup;
 834
 835         return w1_add_master_device(&dev->master);
 836 }
 837
 838 static void ds_w1_fini(struct ds_device *dev)
 839 {
 840         w1_remove_master_device(&dev->master);
 841 }
 842
 843 static int ds_probe(struct usb_interface *intf,
 844                     const struct usb_device_id *udev_id)
 845 {
 846         struct usb_device *udev = interface_to_usbdev(intf);
 847         struct usb_endpoint_descriptor *endpoint;
 848         struct usb_host_interface *iface_desc;
 849         struct ds_device *dev;
 850         int i, err;
 851
 852         dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 853         if (!dev) {
 854                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 855                 return -ENOMEM;
 856         }
 857         dev->spu_sleep = 0;
 858         dev->udev = usb_get_dev(udev);
 859         if (!dev->udev) {
 860                 err = -ENOMEM;
 861                 goto err_out_free;
 862         }
 863         memset(dev->ep, 0, sizeof(dev->ep));
 864
 865         usb_set_intfdata(intf, dev);
 866
 867         err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 868         if (err) {
 869                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 870                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 871                 goto err_out_clear;
 872         }
 873
 874         err = usb_reset_configuration(dev->udev);
 875         if (err) {
 876                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 877                 goto err_out_clear;
 878         }
 879
 880         iface_desc = &intf->altsetting[0];
 881         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 882                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 883                 err = -EINVAL;
 884                 goto err_out_clear;
 885         }
 886
 887         /*
 888          * This loop doesn'd show control 0 endpoint,
 889          * so we will fill only 1-3 endpoints entry.
 890          */
 891         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 892                 endpoint = &iface_desc->endpoint[i].desc;
 893
 894                 dev->ep[i+1] = endpoint->bEndpointAddress;
 895 #if 0
 896                 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
 897                         i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
 898                         (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
 899                         endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 900 #endif
 901         }
 902
 903         err = ds_w1_init(dev);
 904         if (err)
 905                 goto err_out_clear;
 906
 907         mutex_lock(&ds_mutex);
 908         list_add_tail(&dev->ds_entry, &ds_devices);
 909         mutex_unlock(&ds_mutex);
 910
 911         return 0;
 912
 913 err_out_clear:
 914         usb_set_intfdata(intf, NULL);
 915         usb_put_dev(dev->udev);
 916 err_out_free:
 917         kfree(dev);
 918         return err;
 919 }
 920
 921 static void ds_disconnect(struct usb_interface *intf)
 922 {
 923         struct ds_device *dev;
 924
 925         dev = usb_get_intfdata(intf);
 926         if (!dev)
 927                 return;
 928
 929         mutex_lock(&ds_mutex);
 930         list_del(&dev->ds_entry);
 931         mutex_unlock(&ds_mutex);
 932
 933         ds_w1_fini(dev);
 934
 935         usb_set_intfdata(intf, NULL);
 936
 937         usb_put_dev(dev->udev);
 938         kfree(dev);
 939 }
 940
 941 static int ds_init(void)
 942 {
 943         int err;
 944
 945         err = usb_register(&ds_driver);
 946         if (err) {
 947                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
 948                 return err;
 949         }
 950
 951         return 0;
 952 }
 953
 954 static void ds_fini(void)
 955 {
 956         usb_deregister(&ds_driver);
 957 }
 958
 959 module_init(ds_init);
 960 module_exit(ds_fini);
 961
 962 MODULE_LICENSE("GPL");
 963 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
 964 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");