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_NTF                        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 /* Result Register flags */
 111 #define RR_DETECT                       0xA5 /* New device detected */
 112 #define RR_NRS                          0x01 /* Reset no presence or ... */
 113 #define RR_SH                           0x02 /* short on reset or set path */
 114 #define RR_APP                          0x04 /* alarming presence on reset */
 115 #define RR_VPP                          0x08 /* 12V expected not seen */
 116 #define RR_CMP                          0x10 /* compare error */
 117 #define RR_CRC                          0x20 /* CRC error detected */
 118 #define RR_RDP                          0x40 /* redirected page */
 119 #define RR_EOS                          0x80 /* end of search error */
 120
 121 #define SPEED_NORMAL                    0x00
 122 #define SPEED_FLEXIBLE                  0x01
 123 #define SPEED_OVERDRIVE                 0x02
 124
 125 #define NUM_EP                          4
 126 #define EP_CONTROL                      0
 127 #define EP_STATUS                       1
 128 #define EP_DATA_OUT                     2
 129 #define EP_DATA_IN                      3
 130
 131 struct ds_device
 132 {
 133         struct list_head        ds_entry;
 134
 135         struct usb_device       *udev;
 136         struct usb_interface    *intf;
 137
 138         int                     ep[NUM_EP];
 139
 140         /* Strong PullUp
 141          * 0: pullup not active, else duration in milliseconds
 142          */
 143         int                     spu_sleep;
 144
 145         struct w1_bus_master    master;
 146 };
 147
 148 struct ds_status
 149 {
 150         u8                      enable;
 151         u8                      speed;
 152         u8                      pullup_dur;
 153         u8                      ppuls_dur;
 154         u8                      pulldown_slew;
 155         u8                      write1_time;
 156         u8                      write0_time;
 157         u8                      reserved0;
 158         u8                      status;
 159         u8                      command0;
 160         u8                      command1;
 161         u8                      command_buffer_status;
 162         u8                      data_out_buffer_status;
 163         u8                      data_in_buffer_status;
 164         u8                      reserved1;
 165         u8                      reserved2;
 166
 167 };
 168
 169 static struct usb_device_id ds_id_table [] = {
 170         { USB_DEVICE(0x04fa, 0x2490) },
 171         { },
 172 };
 173 MODULE_DEVICE_TABLE(usb, ds_id_table);
 174
 175 static int ds_probe(struct usb_interface *, const struct usb_device_id *);
 176 static void ds_disconnect(struct usb_interface *);
 177
 178 static int ds_send_control(struct ds_device *, u16, u16);
 179 static int ds_send_control_cmd(struct ds_device *, u16, u16);
 180
 181 static LIST_HEAD(ds_devices);
 182 static DEFINE_MUTEX(ds_mutex);
 183
 184 static struct usb_driver ds_driver = {
 185         .name =         "DS9490R",
 186         .probe =        ds_probe,
 187         .disconnect =   ds_disconnect,
 188         .id_table =     ds_id_table,
 189 };
 190
 191 static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
 192 {
 193         int err;
 194
 195         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 196                         CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
 197         if (err < 0) {
 198                 printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
 199                                 value, index, err);
 200                 return err;
 201         }
 202
 203         return err;
 204 }
 205
 206 static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
 207 {
 208         int err;
 209
 210         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 211                         MODE_CMD, 0x40, value, index, NULL, 0, 1000);
 212         if (err < 0) {
 213                 printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
 214                                 value, index, err);
 215                 return err;
 216         }
 217
 218         return err;
 219 }
 220
 221 static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
 222 {
 223         int err;
 224
 225         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 226                         COMM_CMD, 0x40, value, index, NULL, 0, 1000);
 227         if (err < 0) {
 228                 printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
 229                                 value, index, err);
 230                 return err;
 231         }
 232
 233         return err;
 234 }
 235
 236 static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
 237                                  unsigned char *buf, int size)
 238 {
 239         int count, err;
 240
 241         memset(st, 0, sizeof(*st));
 242
 243         count = 0;
 244         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
 245         if (err < 0) {
 246                 printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
 247                 return err;
 248         }
 249
 250         if (count >= sizeof(*st))
 251                 memcpy(st, buf, sizeof(*st));
 252
 253         return count;
 254 }
 255
 256 static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off)
 257 {
 258         printk(KERN_INFO "%45s: %8x\n", str, buf[off]);
 259 }
 260
 261 static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count)
 262 {
 263         int i;
 264
 265         printk(KERN_INFO "0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
 266         for (i=0; i<count; ++i)
 267                 printk("%02x ", buf[i]);
 268         printk(KERN_INFO "\n");
 269
 270         if (count >= 16) {
 271                 ds_print_msg(buf, "enable flag", 0);
 272                 ds_print_msg(buf, "1-wire speed", 1);
 273                 ds_print_msg(buf, "strong pullup duration", 2);
 274                 ds_print_msg(buf, "programming pulse duration", 3);
 275                 ds_print_msg(buf, "pulldown slew rate control", 4);
 276                 ds_print_msg(buf, "write-1 low time", 5);
 277                 ds_print_msg(buf, "data sample offset/write-0 recovery time",
 278                         6);
 279                 ds_print_msg(buf, "reserved (test register)", 7);
 280                 ds_print_msg(buf, "device status flags", 8);
 281                 ds_print_msg(buf, "communication command byte 1", 9);
 282                 ds_print_msg(buf, "communication command byte 2", 10);
 283                 ds_print_msg(buf, "communication command buffer status", 11);
 284                 ds_print_msg(buf, "1-wire data output buffer status", 12);
 285                 ds_print_msg(buf, "1-wire data input buffer status", 13);
 286                 ds_print_msg(buf, "reserved", 14);
 287                 ds_print_msg(buf, "reserved", 15);
 288         }
 289         for (i = 16; i < count; ++i) {
 290                 if (buf[i] == RR_DETECT) {
 291                         ds_print_msg(buf, "new device detect", i);
 292                         continue;
 293                 }
 294                 ds_print_msg(buf, "Result Register Value: ", i);
 295                 if (buf[i] & RR_NRS)
 296                         printk(KERN_INFO "NRS: Reset no presence or ...\n");
 297                 if (buf[i] & RR_SH)
 298                         printk(KERN_INFO "SH: short on reset or set path\n");
 299                 if (buf[i] & RR_APP)
 300                         printk(KERN_INFO "APP: alarming presence on reset\n");
 301                 if (buf[i] & RR_VPP)
 302                         printk(KERN_INFO "VPP: 12V expected not seen\n");
 303                 if (buf[i] & RR_CMP)
 304                         printk(KERN_INFO "CMP: compare error\n");
 305                 if (buf[i] & RR_CRC)
 306                         printk(KERN_INFO "CRC: CRC error detected\n");
 307                 if (buf[i] & RR_RDP)
 308                         printk(KERN_INFO "RDP: redirected page\n");
 309                 if (buf[i] & RR_EOS)
 310                         printk(KERN_INFO "EOS: end of search error\n");
 311         }
 312 }
 313
 314 static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
 315 {
 316         int count, err;
 317         struct ds_status st;
 318
 319         /* Careful on size.  If size is less than what is available in
 320          * the input buffer, the device fails the bulk transfer and
 321          * clears the input buffer.  It could read the maximum size of
 322          * the data buffer, but then do you return the first, last, or
 323          * some set of the middle size bytes?  As long as the rest of
 324          * the code is correct there will be size bytes waiting.  A
 325          * call to ds_wait_status will wait until the device is idle
 326          * and any data to be received would have been available.
 327          */
 328         count = 0;
 329         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
 330                                 buf, size, &count, 1000);
 331         if (err < 0) {
 332                 u8 buf[0x20];
 333                 int count;
 334
 335                 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
 336                 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
 337
 338                 count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 339                 ds_dump_status(dev, buf, count);
 340                 return err;
 341         }
 342
 343 #if 0
 344         {
 345                 int i;
 346
 347                 printk("%s: count=%d: ", __func__, count);
 348                 for (i=0; i<count; ++i)
 349                         printk("%02x ", buf[i]);
 350                 printk("\n");
 351         }
 352 #endif
 353         return count;
 354 }
 355
 356 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 357 {
 358         int count, err;
 359
 360         count = 0;
 361         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 362         if (err < 0) {
 363                 printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: "
 364                         "err=%d.\n", dev->ep[EP_DATA_OUT], err);
 365                 return err;
 366         }
 367
 368         return err;
 369 }
 370
 371 #if 0
 372
 373 int ds_stop_pulse(struct ds_device *dev, int limit)
 374 {
 375         struct ds_status st;
 376         int count = 0, err = 0;
 377         u8 buf[0x20];
 378
 379         do {
 380                 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
 381                 if (err)
 382                         break;
 383                 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
 384                 if (err)
 385                         break;
 386                 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 387                 if (err)
 388                         break;
 389
 390                 if ((st.status & ST_SPUA) == 0) {
 391                         err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
 392                         if (err)
 393                                 break;
 394                 }
 395         } while(++count < limit);
 396
 397         return err;
 398 }
 399
 400 int ds_detect(struct ds_device *dev, struct ds_status *st)
 401 {
 402         int err;
 403
 404         err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 405         if (err)
 406                 return err;
 407
 408         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
 409         if (err)
 410                 return err;
 411
 412         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
 413         if (err)
 414                 return err;
 415
 416         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
 417         if (err)
 418                 return err;
 419
 420         err = ds_dump_status(dev, st);
 421
 422         return err;
 423 }
 424
 425 #endif  /*  0  */
 426
 427 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 428 {
 429         u8 buf[0x20];
 430         int err, count = 0;
 431
 432         do {
 433                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 434 #if 0
 435                 if (err >= 0) {
 436                         int i;
 437                         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
 438                         for (i=0; i<err; ++i)
 439                                 printk("%02x ", buf[i]);
 440                         printk("\n");
 441                 }
 442 #endif
 443         } while (!(buf[0x08] & ST_IDLE) && !(err < 0) && ++count < 100);
 444
 445         if (err >= 16 && st->status & ST_EPOF) {
 446                 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
 447                 ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 448                 /* Always dump the device status. */
 449                 count = 101;
 450         }
 451
 452         /* Dump the status for errors or if there is extended return data.
 453          * The extended status includes new device detection (maybe someone
 454          * can do something with it).
 455          */
 456         if (err > 16 || count >= 100 || err < 0)
 457                 ds_dump_status(dev, buf, err);
 458
 459         /* Extended data isn't an error.  Well, a short is, but the dump
 460          * would have already told the user that and we can't do anything
 461          * about it in software anyway.
 462          */
 463         if (count >= 100 || err < 0)
 464                 return -1;
 465         else
 466                 return 0;
 467 }
 468
 469 static int ds_reset(struct ds_device *dev)
 470 {
 471         int err;
 472
 473         /* Other potentionally interesting flags for reset.
 474          *
 475          * COMM_NTF: Return result register feedback.  This could be used to
 476          * detect some conditions such as short, alarming presence, or
 477          * detect if a new device was detected.
 478          *
 479          * COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE:
 480          * Select the data transfer rate.
 481          */
 482         err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL);
 483         if (err)
 484                 return err;
 485
 486         return 0;
 487 }
 488
 489 #if 0
 490 static int ds_set_speed(struct ds_device *dev, int speed)
 491 {
 492         int err;
 493
 494         if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
 495                 return -EINVAL;
 496
 497         if (speed != SPEED_OVERDRIVE)
 498                 speed = SPEED_FLEXIBLE;
 499
 500         speed &= 0xff;
 501
 502         err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
 503         if (err)
 504                 return err;
 505
 506         return err;
 507 }
 508 #endif  /*  0  */
 509
 510 static int ds_set_pullup(struct ds_device *dev, int delay)
 511 {
 512         int err;
 513         u8 del = 1 + (u8)(delay >> 4);
 514
 515         dev->spu_sleep = 0;
 516         err = ds_send_control_mode(dev, MOD_PULSE_EN, delay ? PULSE_SPUE : 0);
 517         if (err)
 518                 return err;
 519
 520         if (delay) {
 521                 err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 522                 if (err)
 523                         return err;
 524
 525                 /* Just storing delay would not get the trunication and
 526                  * roundup.
 527                  */
 528                 dev->spu_sleep = del<<4;
 529         }
 530
 531         return err;
 532 }
 533
 534 static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 535 {
 536         int err;
 537         struct ds_status st;
 538
 539         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0),
 540                 0);
 541         if (err)
 542                 return err;
 543
 544         ds_wait_status(dev, &st);
 545
 546         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 547         if (err < 0)
 548                 return err;
 549
 550         return 0;
 551 }
 552
 553 #if 0
 554 static int ds_write_bit(struct ds_device *dev, u8 bit)
 555 {
 556         int err;
 557         struct ds_status st;
 558
 559         /* Set COMM_ICP to write without a readback.  Note, this will
 560          * produce one time slot, a down followed by an up with COMM_D
 561          * only determing the timing.
 562          */
 563         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP |
 564                 (bit ? COMM_D : 0), 0);
 565         if (err)
 566                 return err;
 567
 568         ds_wait_status(dev, &st);
 569
 570         return 0;
 571 }
 572 #endif
 573
 574 static int ds_write_byte(struct ds_device *dev, u8 byte)
 575 {
 576         int err;
 577         struct ds_status st;
 578         u8 rbyte;
 579
 580         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
 581         if (err)
 582                 return err;
 583
 584         if (dev->spu_sleep)
 585                 msleep(dev->spu_sleep);
 586
 587         err = ds_wait_status(dev, &st);
 588         if (err)
 589                 return err;
 590
 591         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 592         if (err < 0)
 593                 return err;
 594
 595         return !(byte == rbyte);
 596 }
 597
 598 static int ds_read_byte(struct ds_device *dev, u8 *byte)
 599 {
 600         int err;
 601         struct ds_status st;
 602
 603         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 604         if (err)
 605                 return err;
 606
 607         ds_wait_status(dev, &st);
 608
 609         err = ds_recv_data(dev, byte, sizeof(*byte));
 610         if (err < 0)
 611                 return err;
 612
 613         return 0;
 614 }
 615
 616 static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 617 {
 618         struct ds_status st;
 619         int err;
 620
 621         if (len > 64*1024)
 622                 return -E2BIG;
 623
 624         memset(buf, 0xFF, len);
 625
 626         err = ds_send_data(dev, buf, len);
 627         if (err < 0)
 628                 return err;
 629
 630         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
 631         if (err)
 632                 return err;
 633
 634         ds_wait_status(dev, &st);
 635
 636         memset(buf, 0x00, len);
 637         err = ds_recv_data(dev, buf, len);
 638
 639         return err;
 640 }
 641
 642 static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 643 {
 644         int err;
 645         struct ds_status st;
 646
 647         err = ds_send_data(dev, buf, len);
 648         if (err < 0)
 649                 return err;
 650
 651         ds_wait_status(dev, &st);
 652
 653         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
 654         if (err)
 655                 return err;
 656
 657         if (dev->spu_sleep)
 658                 msleep(dev->spu_sleep);
 659
 660         ds_wait_status(dev, &st);
 661
 662         err = ds_recv_data(dev, buf, len);
 663         if (err < 0)
 664                 return err;
 665
 666         return !(err == len);
 667 }
 668
 669 #if 0
 670
 671 static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
 672 {
 673         int err;
 674         u16 value, index;
 675         struct ds_status st;
 676
 677         memset(buf, 0, sizeof(buf));
 678
 679         err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
 680         if (err)
 681                 return err;
 682
 683         ds_wait_status(ds_dev, &st);
 684
 685         value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
 686         index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
 687         err = ds_send_control(ds_dev, value, index);
 688         if (err)
 689                 return err;
 690
 691         ds_wait_status(ds_dev, &st);
 692
 693         err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
 694         if (err < 0)
 695                 return err;
 696
 697         return err/8;
 698 }
 699
 700 static int ds_match_access(struct ds_device *dev, u64 init)
 701 {
 702         int err;
 703         struct ds_status st;
 704
 705         err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
 706         if (err)
 707                 return err;
 708
 709         ds_wait_status(dev, &st);
 710
 711         err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
 712         if (err)
 713                 return err;
 714
 715         ds_wait_status(dev, &st);
 716
 717         return 0;
 718 }
 719
 720 static int ds_set_path(struct ds_device *dev, u64 init)
 721 {
 722         int err;
 723         struct ds_status st;
 724         u8 buf[9];
 725
 726         memcpy(buf, &init, 8);
 727         buf[8] = BRANCH_MAIN;
 728
 729         err = ds_send_data(dev, buf, sizeof(buf));
 730         if (err)
 731                 return err;
 732
 733         ds_wait_status(dev, &st);
 734
 735         err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
 736         if (err)
 737                 return err;
 738
 739         ds_wait_status(dev, &st);
 740
 741         return 0;
 742 }
 743
 744 #endif  /*  0  */
 745
 746 static u8 ds9490r_touch_bit(void *data, u8 bit)
 747 {
 748         u8 ret;
 749         struct ds_device *dev = data;
 750
 751         if (ds_touch_bit(dev, bit, &ret))
 752                 return 0;
 753
 754         return ret;
 755 }
 756
 757 #if 0
 758 static void ds9490r_write_bit(void *data, u8 bit)
 759 {
 760         struct ds_device *dev = data;
 761
 762         ds_write_bit(dev, bit);
 763 }
 764
 765 static u8 ds9490r_read_bit(void *data)
 766 {
 767         struct ds_device *dev = data;
 768         int err;
 769         u8 bit = 0;
 770
 771         err = ds_touch_bit(dev, 1, &bit);
 772         if (err)
 773                 return 0;
 774
 775         return bit & 1;
 776 }
 777 #endif
 778
 779 static void ds9490r_write_byte(void *data, u8 byte)
 780 {
 781         struct ds_device *dev = data;
 782
 783         ds_write_byte(dev, byte);
 784 }
 785
 786 static u8 ds9490r_read_byte(void *data)
 787 {
 788         struct ds_device *dev = data;
 789         int err;
 790         u8 byte = 0;
 791
 792         err = ds_read_byte(dev, &byte);
 793         if (err)
 794                 return 0;
 795
 796         return byte;
 797 }
 798
 799 static void ds9490r_write_block(void *data, const u8 *buf, int len)
 800 {
 801         struct ds_device *dev = data;
 802
 803         ds_write_block(dev, (u8 *)buf, len);
 804 }
 805
 806 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
 807 {
 808         struct ds_device *dev = data;
 809         int err;
 810
 811         err = ds_read_block(dev, buf, len);
 812         if (err < 0)
 813                 return 0;
 814
 815         return len;
 816 }
 817
 818 static u8 ds9490r_reset(void *data)
 819 {
 820         struct ds_device *dev = data;
 821         int err;
 822
 823         err = ds_reset(dev);
 824         if (err)
 825                 return 1;
 826
 827         return 0;
 828 }
 829
 830 static u8 ds9490r_set_pullup(void *data, int delay)
 831 {
 832         struct ds_device *dev = data;
 833
 834         if (ds_set_pullup(dev, delay))
 835                 return 1;
 836
 837         return 0;
 838 }
 839
 840 static int ds_w1_init(struct ds_device *dev)
 841 {
 842         memset(&dev->master, 0, sizeof(struct w1_bus_master));
 843
 844         /* Reset the device as it can be in a bad state.
 845          * This is necessary because a block write will wait for data
 846          * to be placed in the output buffer and block any later
 847          * commands which will keep accumulating and the device will
 848          * not be idle.  Another case is removing the ds2490 module
 849          * while a bus search is in progress, somehow a few commands
 850          * get through, but the input transfers fail leaving data in
 851          * the input buffer.  This will cause the next read to fail
 852          * see the note in ds_recv_data.
 853          */
 854         ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 855
 856         dev->master.data        = dev;
 857         dev->master.touch_bit   = &ds9490r_touch_bit;
 858         /* read_bit and write_bit in w1_bus_master are expected to set and
 859          * sample the line level.  For write_bit that means it is expected to
 860          * set it to that value and leave it there.  ds2490 only supports an
 861          * individual time slot at the lowest level.  The requirement from
 862          * pulling the bus state down to reading the state is 15us, something
 863          * that isn't realistic on the USB bus anyway.
 864         dev->master.read_bit    = &ds9490r_read_bit;
 865         dev->master.write_bit   = &ds9490r_write_bit;
 866         */
 867         dev->master.read_byte   = &ds9490r_read_byte;
 868         dev->master.write_byte  = &ds9490r_write_byte;
 869         dev->master.read_block  = &ds9490r_read_block;
 870         dev->master.write_block = &ds9490r_write_block;
 871         dev->master.reset_bus   = &ds9490r_reset;
 872         dev->master.set_pullup  = &ds9490r_set_pullup;
 873
 874         return w1_add_master_device(&dev->master);
 875 }
 876
 877 static void ds_w1_fini(struct ds_device *dev)
 878 {
 879         w1_remove_master_device(&dev->master);
 880 }
 881
 882 static int ds_probe(struct usb_interface *intf,
 883                     const struct usb_device_id *udev_id)
 884 {
 885         struct usb_device *udev = interface_to_usbdev(intf);
 886         struct usb_endpoint_descriptor *endpoint;
 887         struct usb_host_interface *iface_desc;
 888         struct ds_device *dev;
 889         int i, err;
 890
 891         dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 892         if (!dev) {
 893                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 894                 return -ENOMEM;
 895         }
 896         dev->spu_sleep = 0;
 897         dev->udev = usb_get_dev(udev);
 898         if (!dev->udev) {
 899                 err = -ENOMEM;
 900                 goto err_out_free;
 901         }
 902         memset(dev->ep, 0, sizeof(dev->ep));
 903
 904         usb_set_intfdata(intf, dev);
 905
 906         err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 907         if (err) {
 908                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 909                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 910                 goto err_out_clear;
 911         }
 912
 913         err = usb_reset_configuration(dev->udev);
 914         if (err) {
 915                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 916                 goto err_out_clear;
 917         }
 918
 919         iface_desc = &intf->altsetting[0];
 920         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 921                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 922                 err = -EINVAL;
 923                 goto err_out_clear;
 924         }
 925
 926         /*
 927          * This loop doesn'd show control 0 endpoint,
 928          * so we will fill only 1-3 endpoints entry.
 929          */
 930         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 931                 endpoint = &iface_desc->endpoint[i].desc;
 932
 933                 dev->ep[i+1] = endpoint->bEndpointAddress;
 934 #if 0
 935                 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
 936                         i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
 937                         (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
 938                         endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 939 #endif
 940         }
 941
 942         err = ds_w1_init(dev);
 943         if (err)
 944                 goto err_out_clear;
 945
 946         mutex_lock(&ds_mutex);
 947         list_add_tail(&dev->ds_entry, &ds_devices);
 948         mutex_unlock(&ds_mutex);
 949
 950         return 0;
 951
 952 err_out_clear:
 953         usb_set_intfdata(intf, NULL);
 954         usb_put_dev(dev->udev);
 955 err_out_free:
 956         kfree(dev);
 957         return err;
 958 }
 959
 960 static void ds_disconnect(struct usb_interface *intf)
 961 {
 962         struct ds_device *dev;
 963
 964         dev = usb_get_intfdata(intf);
 965         if (!dev)
 966                 return;
 967
 968         mutex_lock(&ds_mutex);
 969         list_del(&dev->ds_entry);
 970         mutex_unlock(&ds_mutex);
 971
 972         ds_w1_fini(dev);
 973
 974         usb_set_intfdata(intf, NULL);
 975
 976         usb_put_dev(dev->udev);
 977         kfree(dev);
 978 }
 979
 980 static int ds_init(void)
 981 {
 982         int err;
 983
 984         err = usb_register(&ds_driver);
 985         if (err) {
 986                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
 987                 return err;
 988         }
 989
 990         return 0;
 991 }
 992
 993 static void ds_fini(void)
 994 {
 995         usb_deregister(&ds_driver);
 996 }
 997
 998 module_init(ds_init);
 999 module_exit(ds_fini);
1000
1001 MODULE_LICENSE("GPL");
1002 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
1003 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");