release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <linux/slab.h>
  27
  28 #include "../w1_int.h"
  29 #include "../w1.h"
  30
  31 /* COMMAND TYPE CODES */
  32 #define CONTROL_CMD                     0x00
  33 #define COMM_CMD                        0x01
  34 #define MODE_CMD                        0x02
  35
  36 /* CONTROL COMMAND CODES */
  37 #define CTL_RESET_DEVICE                0x0000
  38 #define CTL_START_EXE                   0x0001
  39 #define CTL_RESUME_EXE                  0x0002
  40 #define CTL_HALT_EXE_IDLE               0x0003
  41 #define CTL_HALT_EXE_DONE               0x0004
  42 #define CTL_FLUSH_COMM_CMDS             0x0007
  43 #define CTL_FLUSH_RCV_BUFFER            0x0008
  44 #define CTL_FLUSH_XMT_BUFFER            0x0009
  45 #define CTL_GET_COMM_CMDS               0x000A
  46
  47 /* MODE COMMAND CODES */
  48 #define MOD_PULSE_EN                    0x0000
  49 #define MOD_SPEED_CHANGE_EN             0x0001
  50 #define MOD_1WIRE_SPEED                 0x0002
  51 #define MOD_STRONG_PU_DURATION          0x0003
  52 #define MOD_PULLDOWN_SLEWRATE           0x0004
  53 #define MOD_PROG_PULSE_DURATION         0x0005
  54 #define MOD_WRITE1_LOWTIME              0x0006
  55 #define MOD_DSOW0_TREC                  0x0007
  56
  57 /* COMMUNICATION COMMAND CODES */
  58 #define COMM_ERROR_ESCAPE               0x0601
  59 #define COMM_SET_DURATION               0x0012
  60 #define COMM_BIT_IO                     0x0020
  61 #define COMM_PULSE                      0x0030
  62 #define COMM_1_WIRE_RESET               0x0042
  63 #define COMM_BYTE_IO                    0x0052
  64 #define COMM_MATCH_ACCESS               0x0064
  65 #define COMM_BLOCK_IO                   0x0074
  66 #define COMM_READ_STRAIGHT              0x0080
  67 #define COMM_DO_RELEASE                 0x6092
  68 #define COMM_SET_PATH                   0x00A2
  69 #define COMM_WRITE_SRAM_PAGE            0x00B2
  70 #define COMM_WRITE_EPROM                0x00C4
  71 #define COMM_READ_CRC_PROT_PAGE         0x00D4
  72 #define COMM_READ_REDIRECT_PAGE_CRC     0x21E4
  73 #define COMM_SEARCH_ACCESS              0x00F4
  74
  75 /* Communication command bits */
  76 #define COMM_TYPE                       0x0008
  77 #define COMM_SE                         0x0008
  78 #define COMM_D                          0x0008
  79 #define COMM_Z                          0x0008
  80 #define COMM_CH                         0x0008
  81 #define COMM_SM                         0x0008
  82 #define COMM_R                          0x0008
  83 #define COMM_IM                         0x0001
  84
  85 #define COMM_PS                         0x4000
  86 #define COMM_PST                        0x4000
  87 #define COMM_CIB                        0x4000
  88 #define COMM_RTS                        0x4000
  89 #define COMM_DT                         0x2000
  90 #define COMM_SPU                        0x1000
  91 #define COMM_F                          0x0800
  92 #define COMM_NTF                        0x0400
  93 #define COMM_ICP                        0x0200
  94 #define COMM_RST                        0x0100
  95
  96 #define PULSE_PROG                      0x01
  97 #define PULSE_SPUE                      0x02
  98
  99 #define BRANCH_MAIN                     0xCC
 100 #define BRANCH_AUX                      0x33
 101
 102 /* Status flags */
 103 #define ST_SPUA                         0x01  /* Strong Pull-up is active */
 104 #define ST_PRGA                         0x02  /* 12V programming pulse is being generated */
 105 #define ST_12VP                         0x04  /* external 12V programming voltage is present */
 106 #define ST_PMOD                         0x08  /* DS2490 powered from USB and external sources */
 107 #define ST_HALT                         0x10  /* DS2490 is currently halted */
 108 #define ST_IDLE                         0x20  /* DS2490 is currently idle */
 109 #define ST_EPOF                         0x80
 110
 111 /* Result Register flags */
 112 #define RR_DETECT                       0xA5 /* New device detected */
 113 #define RR_NRS                          0x01 /* Reset no presence or ... */
 114 #define RR_SH                           0x02 /* short on reset or set path */
 115 #define RR_APP                          0x04 /* alarming presence on reset */
 116 #define RR_VPP                          0x08 /* 12V expected not seen */
 117 #define RR_CMP                          0x10 /* compare error */
 118 #define RR_CRC                          0x20 /* CRC error detected */
 119 #define RR_RDP                          0x40 /* redirected page */
 120 #define RR_EOS                          0x80 /* end of search error */
 121
 122 #define SPEED_NORMAL                    0x00
 123 #define SPEED_FLEXIBLE                  0x01
 124 #define SPEED_OVERDRIVE                 0x02
 125
 126 #define NUM_EP                          4
 127 #define EP_CONTROL                      0
 128 #define EP_STATUS                       1
 129 #define EP_DATA_OUT                     2
 130 #define EP_DATA_IN                      3
 131
 132 struct ds_device
 133 {
 134         struct list_head        ds_entry;
 135
 136         struct usb_device       *udev;
 137         struct usb_interface    *intf;
 138
 139         int                     ep[NUM_EP];
 140
 141         /* Strong PullUp
 142          * 0: pullup not active, else duration in milliseconds
 143          */
 144         int                     spu_sleep;
 145         /* spu_bit contains COMM_SPU or 0 depending on if the strong pullup
 146          * should be active or not for writes.
 147          */
 148         u16                     spu_bit;
 149
 150         struct w1_bus_master    master;
 151 };
 152
 153 struct ds_status
 154 {
 155         u8                      enable;
 156         u8                      speed;
 157         u8                      pullup_dur;
 158         u8                      ppuls_dur;
 159         u8                      pulldown_slew;
 160         u8                      write1_time;
 161         u8                      write0_time;
 162         u8                      reserved0;
 163         u8                      status;
 164         u8                      command0;
 165         u8                      command1;
 166         u8                      command_buffer_status;
 167         u8                      data_out_buffer_status;
 168         u8                      data_in_buffer_status;
 169         u8                      reserved1;
 170         u8                      reserved2;
 171
 172 };
 173
 174 static struct usb_device_id ds_id_table [] = {
 175         { USB_DEVICE(0x04fa, 0x2490) },
 176         { },
 177 };
 178 MODULE_DEVICE_TABLE(usb, ds_id_table);
 179
 180 static int ds_probe(struct usb_interface *, const struct usb_device_id *);
 181 static void ds_disconnect(struct usb_interface *);
 182
 183 static int ds_send_control(struct ds_device *, u16, u16);
 184 static int ds_send_control_cmd(struct ds_device *, u16, u16);
 185
 186 static LIST_HEAD(ds_devices);
 187 static DEFINE_MUTEX(ds_mutex);
 188
 189 static struct usb_driver ds_driver = {
 190         .name =         "DS9490R",
 191         .probe =        ds_probe,
 192         .disconnect =   ds_disconnect,
 193         .id_table =     ds_id_table,
 194 };
 195
 196 static int ds_send_control_cmd(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                         CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
 202         if (err < 0) {
 203                 printk(KERN_ERR "Failed to send command 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_mode(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                         MODE_CMD, 0x40, value, index, NULL, 0, 1000);
 217         if (err < 0) {
 218                 printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
 219                                 value, index, err);
 220                 return err;
 221         }
 222
 223         return err;
 224 }
 225
 226 static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
 227 {
 228         int err;
 229
 230         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 231                         COMM_CMD, 0x40, value, index, NULL, 0, 1000);
 232         if (err < 0) {
 233                 printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
 234                                 value, index, err);
 235                 return err;
 236         }
 237
 238         return err;
 239 }
 240
 241 static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
 242                                  unsigned char *buf, int size)
 243 {
 244         int count, err;
 245
 246         memset(st, 0, sizeof(*st));
 247
 248         count = 0;
 249         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
 250         if (err < 0) {
 251                 printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
 252                 return err;
 253         }
 254
 255         if (count >= sizeof(*st))
 256                 memcpy(st, buf, sizeof(*st));
 257
 258         return count;
 259 }
 260
 261 static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off)
 262 {
 263         printk(KERN_INFO "%45s: %8x\n", str, buf[off]);
 264 }
 265
 266 static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count)
 267 {
 268         int i;
 269
 270         printk(KERN_INFO "0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
 271         for (i=0; i<count; ++i)
 272                 printk("%02x ", buf[i]);
 273         printk(KERN_INFO "\n");
 274
 275         if (count >= 16) {
 276                 ds_print_msg(buf, "enable flag", 0);
 277                 ds_print_msg(buf, "1-wire speed", 1);
 278                 ds_print_msg(buf, "strong pullup duration", 2);
 279                 ds_print_msg(buf, "programming pulse duration", 3);
 280                 ds_print_msg(buf, "pulldown slew rate control", 4);
 281                 ds_print_msg(buf, "write-1 low time", 5);
 282                 ds_print_msg(buf, "data sample offset/write-0 recovery time",
 283                         6);
 284                 ds_print_msg(buf, "reserved (test register)", 7);
 285                 ds_print_msg(buf, "device status flags", 8);
 286                 ds_print_msg(buf, "communication command byte 1", 9);
 287                 ds_print_msg(buf, "communication command byte 2", 10);
 288                 ds_print_msg(buf, "communication command buffer status", 11);
 289                 ds_print_msg(buf, "1-wire data output buffer status", 12);
 290                 ds_print_msg(buf, "1-wire data input buffer status", 13);
 291                 ds_print_msg(buf, "reserved", 14);
 292                 ds_print_msg(buf, "reserved", 15);
 293         }
 294         for (i = 16; i < count; ++i) {
 295                 if (buf[i] == RR_DETECT) {
 296                         ds_print_msg(buf, "new device detect", i);
 297                         continue;
 298                 }
 299                 ds_print_msg(buf, "Result Register Value: ", i);
 300                 if (buf[i] & RR_NRS)
 301                         printk(KERN_INFO "NRS: Reset no presence or ...\n");
 302                 if (buf[i] & RR_SH)
 303                         printk(KERN_INFO "SH: short on reset or set path\n");
 304                 if (buf[i] & RR_APP)
 305                         printk(KERN_INFO "APP: alarming presence on reset\n");
 306                 if (buf[i] & RR_VPP)
 307                         printk(KERN_INFO "VPP: 12V expected not seen\n");
 308                 if (buf[i] & RR_CMP)
 309                         printk(KERN_INFO "CMP: compare error\n");
 310                 if (buf[i] & RR_CRC)
 311                         printk(KERN_INFO "CRC: CRC error detected\n");
 312                 if (buf[i] & RR_RDP)
 313                         printk(KERN_INFO "RDP: redirected page\n");
 314                 if (buf[i] & RR_EOS)
 315                         printk(KERN_INFO "EOS: end of search error\n");
 316         }
 317 }
 318
 319 static void ds_reset_device(struct ds_device *dev)
 320 {
 321         ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 322         /* Always allow strong pullup which allow individual writes to use
 323          * the strong pullup.
 324          */
 325         if (ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE))
 326                 printk(KERN_ERR "ds_reset_device: "
 327                         "Error allowing strong pullup\n");
 328         /* Chip strong pullup time was cleared. */
 329         if (dev->spu_sleep) {
 330                 /* lower 4 bits are 0, see ds_set_pullup */
 331                 u8 del = dev->spu_sleep>>4;
 332                 if (ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del))
 333                         printk(KERN_ERR "ds_reset_device: "
 334                                 "Error setting duration\n");
 335         }
 336 }
 337
 338 static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
 339 {
 340         int count, err;
 341         struct ds_status st;
 342
 343         /* Careful on size.  If size is less than what is available in
 344          * the input buffer, the device fails the bulk transfer and
 345          * clears the input buffer.  It could read the maximum size of
 346          * the data buffer, but then do you return the first, last, or
 347          * some set of the middle size bytes?  As long as the rest of
 348          * the code is correct there will be size bytes waiting.  A
 349          * call to ds_wait_status will wait until the device is idle
 350          * and any data to be received would have been available.
 351          */
 352         count = 0;
 353         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
 354                                 buf, size, &count, 1000);
 355         if (err < 0) {
 356                 u8 buf[0x20];
 357                 int count;
 358
 359                 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
 360                 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
 361
 362                 count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 363                 ds_dump_status(dev, buf, count);
 364                 return err;
 365         }
 366
 367         return count;
 368 }
 369
 370 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 371 {
 372         int count, err;
 373
 374         count = 0;
 375         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 376         if (err < 0) {
 377                 printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: "
 378                         "err=%d.\n", dev->ep[EP_DATA_OUT], err);
 379                 return err;
 380         }
 381
 382         return err;
 383 }
 384
 385
 386 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 387 {
 388         u8 buf[0x20];
 389         int err, count = 0;
 390
 391         do {
 392                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 393         } while (!(buf[0x08] & ST_IDLE) && !(err < 0) && ++count < 100);
 394
 395         if (err >= 16 && st->status & ST_EPOF) {
 396                 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
 397                 ds_reset_device(dev);
 398                 /* Always dump the device status. */
 399                 count = 101;
 400         }
 401
 402         /* Dump the status for errors or if there is extended return data.
 403          * The extended status includes new device detection (maybe someone
 404          * can do something with it).
 405          */
 406         if (err > 16 || count >= 100 || err < 0)
 407                 ds_dump_status(dev, buf, err);
 408
 409         /* Extended data isn't an error.  Well, a short is, but the dump
 410          * would have already told the user that and we can't do anything
 411          * about it in software anyway.
 412          */
 413         if (count >= 100 || err < 0)
 414                 return -1;
 415         else
 416                 return 0;
 417 }
 418
 419 static int ds_reset(struct ds_device *dev)
 420 {
 421         int err;
 422
 423         /* Other potentionally interesting flags for reset.
 424          *
 425          * COMM_NTF: Return result register feedback.  This could be used to
 426          * detect some conditions such as short, alarming presence, or
 427          * detect if a new device was detected.
 428          *
 429          * COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE:
 430          * Select the data transfer rate.
 431          */
 432         err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL);
 433         if (err)
 434                 return err;
 435
 436         return 0;
 437 }
 438
 439
 440 static int ds_set_pullup(struct ds_device *dev, int delay)
 441 {
 442         int err = 0;
 443         u8 del = 1 + (u8)(delay >> 4);
 444         /* Just storing delay would not get the trunication and roundup. */
 445         int ms = del<<4;
 446
 447         /* Enable spu_bit if a delay is set. */
 448         dev->spu_bit = delay ? COMM_SPU : 0;
 449         /* If delay is zero, it has already been disabled, if the time is
 450          * the same as the hardware was last programmed to, there is also
 451          * nothing more to do.  Compare with the recalculated value ms
 452          * rather than del or delay which can have a different value.
 453          */
 454         if (delay == 0 || ms == dev->spu_sleep)
 455                 return err;
 456
 457         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 458         if (err)
 459                 return err;
 460
 461         dev->spu_sleep = ms;
 462
 463         return err;
 464 }
 465
 466 static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 467 {
 468         int err;
 469         struct ds_status st;
 470
 471         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0),
 472                 0);
 473         if (err)
 474                 return err;
 475
 476         ds_wait_status(dev, &st);
 477
 478         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 479         if (err < 0)
 480                 return err;
 481
 482         return 0;
 483 }
 484
 485
 486 static int ds_write_byte(struct ds_device *dev, u8 byte)
 487 {
 488         int err;
 489         struct ds_status st;
 490         u8 rbyte;
 491
 492         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte);
 493         if (err)
 494                 return err;
 495
 496         if (dev->spu_bit)
 497                 msleep(dev->spu_sleep);
 498
 499         err = ds_wait_status(dev, &st);
 500         if (err)
 501                 return err;
 502
 503         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 504         if (err < 0)
 505                 return err;
 506
 507         return !(byte == rbyte);
 508 }
 509
 510 static int ds_read_byte(struct ds_device *dev, u8 *byte)
 511 {
 512         int err;
 513         struct ds_status st;
 514
 515         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 516         if (err)
 517                 return err;
 518
 519         ds_wait_status(dev, &st);
 520
 521         err = ds_recv_data(dev, byte, sizeof(*byte));
 522         if (err < 0)
 523                 return err;
 524
 525         return 0;
 526 }
 527
 528 static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 529 {
 530         struct ds_status st;
 531         int err;
 532
 533         if (len > 64*1024)
 534                 return -E2BIG;
 535
 536         memset(buf, 0xFF, len);
 537
 538         err = ds_send_data(dev, buf, len);
 539         if (err < 0)
 540                 return err;
 541
 542         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
 543         if (err)
 544                 return err;
 545
 546         ds_wait_status(dev, &st);
 547
 548         memset(buf, 0x00, len);
 549         err = ds_recv_data(dev, buf, len);
 550
 551         return err;
 552 }
 553
 554 static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 555 {
 556         int err;
 557         struct ds_status st;
 558
 559         err = ds_send_data(dev, buf, len);
 560         if (err < 0)
 561                 return err;
 562
 563         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len);
 564         if (err)
 565                 return err;
 566
 567         if (dev->spu_bit)
 568                 msleep(dev->spu_sleep);
 569
 570         ds_wait_status(dev, &st);
 571
 572         err = ds_recv_data(dev, buf, len);
 573         if (err < 0)
 574                 return err;
 575
 576         return !(err == len);
 577 }
 578
 579
 580 static u8 ds9490r_touch_bit(void *data, u8 bit)
 581 {
 582         u8 ret;
 583         struct ds_device *dev = data;
 584
 585         if (ds_touch_bit(dev, bit, &ret))
 586                 return 0;
 587
 588         return ret;
 589 }
 590
 591
 592 static void ds9490r_write_byte(void *data, u8 byte)
 593 {
 594         struct ds_device *dev = data;
 595
 596         ds_write_byte(dev, byte);
 597 }
 598
 599 static u8 ds9490r_read_byte(void *data)
 600 {
 601         struct ds_device *dev = data;
 602         int err;
 603         u8 byte = 0;
 604
 605         err = ds_read_byte(dev, &byte);
 606         if (err)
 607                 return 0;
 608
 609         return byte;
 610 }
 611
 612 static void ds9490r_write_block(void *data, const u8 *buf, int len)
 613 {
 614         struct ds_device *dev = data;
 615
 616         ds_write_block(dev, (u8 *)buf, len);
 617 }
 618
 619 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
 620 {
 621         struct ds_device *dev = data;
 622         int err;
 623
 624         err = ds_read_block(dev, buf, len);
 625         if (err < 0)
 626                 return 0;
 627
 628         return len;
 629 }
 630
 631 static u8 ds9490r_reset(void *data)
 632 {
 633         struct ds_device *dev = data;
 634         int err;
 635
 636         err = ds_reset(dev);
 637         if (err)
 638                 return 1;
 639
 640         return 0;
 641 }
 642
 643 static u8 ds9490r_set_pullup(void *data, int delay)
 644 {
 645         struct ds_device *dev = data;
 646
 647         if (ds_set_pullup(dev, delay))
 648                 return 1;
 649
 650         return 0;
 651 }
 652
 653 static int ds_w1_init(struct ds_device *dev)
 654 {
 655         memset(&dev->master, 0, sizeof(struct w1_bus_master));
 656
 657         /* Reset the device as it can be in a bad state.
 658          * This is necessary because a block write will wait for data
 659          * to be placed in the output buffer and block any later
 660          * commands which will keep accumulating and the device will
 661          * not be idle.  Another case is removing the ds2490 module
 662          * while a bus search is in progress, somehow a few commands
 663          * get through, but the input transfers fail leaving data in
 664          * the input buffer.  This will cause the next read to fail
 665          * see the note in ds_recv_data.
 666          */
 667         ds_reset_device(dev);
 668
 669         dev->master.data        = dev;
 670         dev->master.touch_bit   = &ds9490r_touch_bit;
 671         /* read_bit and write_bit in w1_bus_master are expected to set and
 672          * sample the line level.  For write_bit that means it is expected to
 673          * set it to that value and leave it there.  ds2490 only supports an
 674          * individual time slot at the lowest level.  The requirement from
 675          * pulling the bus state down to reading the state is 15us, something
 676          * that isn't realistic on the USB bus anyway.
 677         dev->master.read_bit    = &ds9490r_read_bit;
 678         dev->master.write_bit   = &ds9490r_write_bit;
 679         */
 680         dev->master.read_byte   = &ds9490r_read_byte;
 681         dev->master.write_byte  = &ds9490r_write_byte;
 682         dev->master.read_block  = &ds9490r_read_block;
 683         dev->master.write_block = &ds9490r_write_block;
 684         dev->master.reset_bus   = &ds9490r_reset;
 685         dev->master.set_pullup  = &ds9490r_set_pullup;
 686
 687         return w1_add_master_device(&dev->master);
 688 }
 689
 690 static void ds_w1_fini(struct ds_device *dev)
 691 {
 692         w1_remove_master_device(&dev->master);
 693 }
 694
 695 static int ds_probe(struct usb_interface *intf,
 696                     const struct usb_device_id *udev_id)
 697 {
 698         struct usb_device *udev = interface_to_usbdev(intf);
 699         struct usb_endpoint_descriptor *endpoint;
 700         struct usb_host_interface *iface_desc;
 701         struct ds_device *dev;
 702         int i, err;
 703
 704         dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 705         if (!dev) {
 706                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 707                 return -ENOMEM;
 708         }
 709         dev->spu_sleep = 0;
 710         dev->spu_bit = 0;
 711         dev->udev = usb_get_dev(udev);
 712         if (!dev->udev) {
 713                 err = -ENOMEM;
 714                 goto err_out_free;
 715         }
 716         memset(dev->ep, 0, sizeof(dev->ep));
 717
 718         usb_set_intfdata(intf, dev);
 719
 720         err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 721         if (err) {
 722                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 723                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 724                 goto err_out_clear;
 725         }
 726
 727         err = usb_reset_configuration(dev->udev);
 728         if (err) {
 729                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 730                 goto err_out_clear;
 731         }
 732
 733         iface_desc = &intf->altsetting[0];
 734         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 735                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 736                 err = -EINVAL;
 737                 goto err_out_clear;
 738         }
 739
 740         /*
 741          * This loop doesn'd show control 0 endpoint,
 742          * so we will fill only 1-3 endpoints entry.
 743          */
 744         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 745                 endpoint = &iface_desc->endpoint[i].desc;
 746
 747                 dev->ep[i+1] = endpoint->bEndpointAddress;
 748         }
 749
 750         err = ds_w1_init(dev);
 751         if (err)
 752                 goto err_out_clear;
 753
 754         mutex_lock(&ds_mutex);
 755         list_add_tail(&dev->ds_entry, &ds_devices);
 756         mutex_unlock(&ds_mutex);
 757
 758         return 0;
 759
 760 err_out_clear:
 761         usb_set_intfdata(intf, NULL);
 762         usb_put_dev(dev->udev);
 763 err_out_free:
 764         kfree(dev);
 765         return err;
 766 }
 767
 768 static void ds_disconnect(struct usb_interface *intf)
 769 {
 770         struct ds_device *dev;
 771
 772         dev = usb_get_intfdata(intf);
 773         if (!dev)
 774                 return;
 775
 776         mutex_lock(&ds_mutex);
 777         list_del(&dev->ds_entry);
 778         mutex_unlock(&ds_mutex);
 779
 780         ds_w1_fini(dev);
 781
 782         usb_set_intfdata(intf, NULL);
 783
 784         usb_put_dev(dev->udev);
 785         kfree(dev);
 786 }
 787
 788 static int ds_init(void)
 789 {
 790         int err;
 791
 792         err = usb_register(&ds_driver);
 793         if (err) {
 794                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
 795                 return err;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static void ds_fini(void)
 802 {
 803         usb_deregister(&ds_driver);
 804 }
 805
 806 module_init(ds_init);
 807 module_exit(ds_fini);
 808
 809 MODULE_LICENSE("GPL");
 810 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
 811 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");