drivers/w1/masters/ds2490.c

   1 /*
   2  *      dscore.c
   3  *
   4  * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>
   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 #if 0
 368         {
 369                 int i;
 370
 371                 printk("%s: count=%d: ", __func__, count);
 372                 for (i=0; i<count; ++i)
 373                         printk("%02x ", buf[i]);
 374                 printk("\n");
 375         }
 376 #endif
 377         return count;
 378 }
 379
 380 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 381 {
 382         int count, err;
 383
 384         count = 0;
 385         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 386         if (err < 0) {
 387                 printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: "
 388                         "err=%d.\n", dev->ep[EP_DATA_OUT], err);
 389                 return err;
 390         }
 391
 392         return err;
 393 }
 394
 395 #if 0
 396
 397 int ds_stop_pulse(struct ds_device *dev, int limit)
 398 {
 399         struct ds_status st;
 400         int count = 0, err = 0;
 401         u8 buf[0x20];
 402
 403         do {
 404                 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
 405                 if (err)
 406                         break;
 407                 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
 408                 if (err)
 409                         break;
 410                 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 411                 if (err)
 412                         break;
 413
 414                 if ((st.status & ST_SPUA) == 0) {
 415                         err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
 416                         if (err)
 417                                 break;
 418                 }
 419         } while(++count < limit);
 420
 421         return err;
 422 }
 423
 424 int ds_detect(struct ds_device *dev, struct ds_status *st)
 425 {
 426         int err;
 427
 428         err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 429         if (err)
 430                 return err;
 431
 432         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
 433         if (err)
 434                 return err;
 435
 436         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
 437         if (err)
 438                 return err;
 439
 440         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
 441         if (err)
 442                 return err;
 443
 444         err = ds_dump_status(dev, st);
 445
 446         return err;
 447 }
 448
 449 #endif  /*  0  */
 450
 451 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 452 {
 453         u8 buf[0x20];
 454         int err, count = 0;
 455
 456         do {
 457                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 458 #if 0
 459                 if (err >= 0) {
 460                         int i;
 461                         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
 462                         for (i=0; i<err; ++i)
 463                                 printk("%02x ", buf[i]);
 464                         printk("\n");
 465                 }
 466 #endif
 467         } while (!(buf[0x08] & ST_IDLE) && !(err < 0) && ++count < 100);
 468
 469         if (err >= 16 && st->status & ST_EPOF) {
 470                 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
 471                 ds_reset_device(dev);
 472                 /* Always dump the device status. */
 473                 count = 101;
 474         }
 475
 476         /* Dump the status for errors or if there is extended return data.
 477          * The extended status includes new device detection (maybe someone
 478          * can do something with it).
 479          */
 480         if (err > 16 || count >= 100 || err < 0)
 481                 ds_dump_status(dev, buf, err);
 482
 483         /* Extended data isn't an error.  Well, a short is, but the dump
 484          * would have already told the user that and we can't do anything
 485          * about it in software anyway.
 486          */
 487         if (count >= 100 || err < 0)
 488                 return -1;
 489         else
 490                 return 0;
 491 }
 492
 493 static int ds_reset(struct ds_device *dev)
 494 {
 495         int err;
 496
 497         /* Other potentionally interesting flags for reset.
 498          *
 499          * COMM_NTF: Return result register feedback.  This could be used to
 500          * detect some conditions such as short, alarming presence, or
 501          * detect if a new device was detected.
 502          *
 503          * COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE:
 504          * Select the data transfer rate.
 505          */
 506         err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL);
 507         if (err)
 508                 return err;
 509
 510         return 0;
 511 }
 512
 513 #if 0
 514 static int ds_set_speed(struct ds_device *dev, int speed)
 515 {
 516         int err;
 517
 518         if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
 519                 return -EINVAL;
 520
 521         if (speed != SPEED_OVERDRIVE)
 522                 speed = SPEED_FLEXIBLE;
 523
 524         speed &= 0xff;
 525
 526         err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
 527         if (err)
 528                 return err;
 529
 530         return err;
 531 }
 532 #endif  /*  0  */
 533
 534 static int ds_set_pullup(struct ds_device *dev, int delay)
 535 {
 536         int err = 0;
 537         u8 del = 1 + (u8)(delay >> 4);
 538         /* Just storing delay would not get the trunication and roundup. */
 539         int ms = del<<4;
 540
 541         /* Enable spu_bit if a delay is set. */
 542         dev->spu_bit = delay ? COMM_SPU : 0;
 543         /* If delay is zero, it has already been disabled, if the time is
 544          * the same as the hardware was last programmed to, there is also
 545          * nothing more to do.  Compare with the recalculated value ms
 546          * rather than del or delay which can have a different value.
 547          */
 548         if (delay == 0 || ms == dev->spu_sleep)
 549                 return err;
 550
 551         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 552         if (err)
 553                 return err;
 554
 555         dev->spu_sleep = ms;
 556
 557         return err;
 558 }
 559
 560 static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 561 {
 562         int err;
 563         struct ds_status st;
 564
 565         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0),
 566                 0);
 567         if (err)
 568                 return err;
 569
 570         ds_wait_status(dev, &st);
 571
 572         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 573         if (err < 0)
 574                 return err;
 575
 576         return 0;
 577 }
 578
 579 #if 0
 580 static int ds_write_bit(struct ds_device *dev, u8 bit)
 581 {
 582         int err;
 583         struct ds_status st;
 584
 585         /* Set COMM_ICP to write without a readback.  Note, this will
 586          * produce one time slot, a down followed by an up with COMM_D
 587          * only determing the timing.
 588          */
 589         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP |
 590                 (bit ? COMM_D : 0), 0);
 591         if (err)
 592                 return err;
 593
 594         ds_wait_status(dev, &st);
 595
 596         return 0;
 597 }
 598 #endif
 599
 600 static int ds_write_byte(struct ds_device *dev, u8 byte)
 601 {
 602         int err;
 603         struct ds_status st;
 604         u8 rbyte;
 605
 606         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte);
 607         if (err)
 608                 return err;
 609
 610         if (dev->spu_bit)
 611                 msleep(dev->spu_sleep);
 612
 613         err = ds_wait_status(dev, &st);
 614         if (err)
 615                 return err;
 616
 617         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 618         if (err < 0)
 619                 return err;
 620
 621         return !(byte == rbyte);
 622 }
 623
 624 static int ds_read_byte(struct ds_device *dev, u8 *byte)
 625 {
 626         int err;
 627         struct ds_status st;
 628
 629         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 630         if (err)
 631                 return err;
 632
 633         ds_wait_status(dev, &st);
 634
 635         err = ds_recv_data(dev, byte, sizeof(*byte));
 636         if (err < 0)
 637                 return err;
 638
 639         return 0;
 640 }
 641
 642 static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 643 {
 644         struct ds_status st;
 645         int err;
 646
 647         if (len > 64*1024)
 648                 return -E2BIG;
 649
 650         memset(buf, 0xFF, len);
 651
 652         err = ds_send_data(dev, buf, len);
 653         if (err < 0)
 654                 return err;
 655
 656         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
 657         if (err)
 658                 return err;
 659
 660         ds_wait_status(dev, &st);
 661
 662         memset(buf, 0x00, len);
 663         err = ds_recv_data(dev, buf, len);
 664
 665         return err;
 666 }
 667
 668 static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 669 {
 670         int err;
 671         struct ds_status st;
 672
 673         err = ds_send_data(dev, buf, len);
 674         if (err < 0)
 675                 return err;
 676
 677         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len);
 678         if (err)
 679                 return err;
 680
 681         if (dev->spu_bit)
 682                 msleep(dev->spu_sleep);
 683
 684         ds_wait_status(dev, &st);
 685
 686         err = ds_recv_data(dev, buf, len);
 687         if (err < 0)
 688                 return err;
 689
 690         return !(err == len);
 691 }
 692
 693 #if 0
 694
 695 static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
 696 {
 697         int err;
 698         u16 value, index;
 699         struct ds_status st;
 700
 701         memset(buf, 0, sizeof(buf));
 702
 703         err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
 704         if (err)
 705                 return err;
 706
 707         ds_wait_status(ds_dev, &st);
 708
 709         value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
 710         index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
 711         err = ds_send_control(ds_dev, value, index);
 712         if (err)
 713                 return err;
 714
 715         ds_wait_status(ds_dev, &st);
 716
 717         err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
 718         if (err < 0)
 719                 return err;
 720
 721         return err/8;
 722 }
 723
 724 static int ds_match_access(struct ds_device *dev, u64 init)
 725 {
 726         int err;
 727         struct ds_status st;
 728
 729         err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
 730         if (err)
 731                 return err;
 732
 733         ds_wait_status(dev, &st);
 734
 735         err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
 736         if (err)
 737                 return err;
 738
 739         ds_wait_status(dev, &st);
 740
 741         return 0;
 742 }
 743
 744 static int ds_set_path(struct ds_device *dev, u64 init)
 745 {
 746         int err;
 747         struct ds_status st;
 748         u8 buf[9];
 749
 750         memcpy(buf, &init, 8);
 751         buf[8] = BRANCH_MAIN;
 752
 753         err = ds_send_data(dev, buf, sizeof(buf));
 754         if (err)
 755                 return err;
 756
 757         ds_wait_status(dev, &st);
 758
 759         err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
 760         if (err)
 761                 return err;
 762
 763         ds_wait_status(dev, &st);
 764
 765         return 0;
 766 }
 767
 768 #endif  /*  0  */
 769
 770 static u8 ds9490r_touch_bit(void *data, u8 bit)
 771 {
 772         u8 ret;
 773         struct ds_device *dev = data;
 774
 775         if (ds_touch_bit(dev, bit, &ret))
 776                 return 0;
 777
 778         return ret;
 779 }
 780
 781 #if 0
 782 static void ds9490r_write_bit(void *data, u8 bit)
 783 {
 784         struct ds_device *dev = data;
 785
 786         ds_write_bit(dev, bit);
 787 }
 788
 789 static u8 ds9490r_read_bit(void *data)
 790 {
 791         struct ds_device *dev = data;
 792         int err;
 793         u8 bit = 0;
 794
 795         err = ds_touch_bit(dev, 1, &bit);
 796         if (err)
 797                 return 0;
 798
 799         return bit & 1;
 800 }
 801 #endif
 802
 803 static void ds9490r_write_byte(void *data, u8 byte)
 804 {
 805         struct ds_device *dev = data;
 806
 807         ds_write_byte(dev, byte);
 808 }
 809
 810 static u8 ds9490r_read_byte(void *data)
 811 {
 812         struct ds_device *dev = data;
 813         int err;
 814         u8 byte = 0;
 815
 816         err = ds_read_byte(dev, &byte);
 817         if (err)
 818                 return 0;
 819
 820         return byte;
 821 }
 822
 823 static void ds9490r_write_block(void *data, const u8 *buf, int len)
 824 {
 825         struct ds_device *dev = data;
 826
 827         ds_write_block(dev, (u8 *)buf, len);
 828 }
 829
 830 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
 831 {
 832         struct ds_device *dev = data;
 833         int err;
 834
 835         err = ds_read_block(dev, buf, len);
 836         if (err < 0)
 837                 return 0;
 838
 839         return len;
 840 }
 841
 842 static u8 ds9490r_reset(void *data)
 843 {
 844         struct ds_device *dev = data;
 845         int err;
 846
 847         err = ds_reset(dev);
 848         if (err)
 849                 return 1;
 850
 851         return 0;
 852 }
 853
 854 static u8 ds9490r_set_pullup(void *data, int delay)
 855 {
 856         struct ds_device *dev = data;
 857
 858         if (ds_set_pullup(dev, delay))
 859                 return 1;
 860
 861         return 0;
 862 }
 863
 864 static int ds_w1_init(struct ds_device *dev)
 865 {
 866         memset(&dev->master, 0, sizeof(struct w1_bus_master));
 867
 868         /* Reset the device as it can be in a bad state.
 869          * This is necessary because a block write will wait for data
 870          * to be placed in the output buffer and block any later
 871          * commands which will keep accumulating and the device will
 872          * not be idle.  Another case is removing the ds2490 module
 873          * while a bus search is in progress, somehow a few commands
 874          * get through, but the input transfers fail leaving data in
 875          * the input buffer.  This will cause the next read to fail
 876          * see the note in ds_recv_data.
 877          */
 878         ds_reset_device(dev);
 879
 880         dev->master.data        = dev;
 881         dev->master.touch_bit   = &ds9490r_touch_bit;
 882         /* read_bit and write_bit in w1_bus_master are expected to set and
 883          * sample the line level.  For write_bit that means it is expected to
 884          * set it to that value and leave it there.  ds2490 only supports an
 885          * individual time slot at the lowest level.  The requirement from
 886          * pulling the bus state down to reading the state is 15us, something
 887          * that isn't realistic on the USB bus anyway.
 888         dev->master.read_bit    = &ds9490r_read_bit;
 889         dev->master.write_bit   = &ds9490r_write_bit;
 890         */
 891         dev->master.read_byte   = &ds9490r_read_byte;
 892         dev->master.write_byte  = &ds9490r_write_byte;
 893         dev->master.read_block  = &ds9490r_read_block;
 894         dev->master.write_block = &ds9490r_write_block;
 895         dev->master.reset_bus   = &ds9490r_reset;
 896         dev->master.set_pullup  = &ds9490r_set_pullup;
 897
 898         return w1_add_master_device(&dev->master);
 899 }
 900
 901 static void ds_w1_fini(struct ds_device *dev)
 902 {
 903         w1_remove_master_device(&dev->master);
 904 }
 905
 906 static int ds_probe(struct usb_interface *intf,
 907                     const struct usb_device_id *udev_id)
 908 {
 909         struct usb_device *udev = interface_to_usbdev(intf);
 910         struct usb_endpoint_descriptor *endpoint;
 911         struct usb_host_interface *iface_desc;
 912         struct ds_device *dev;
 913         int i, err;
 914
 915         dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 916         if (!dev) {
 917                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 918                 return -ENOMEM;
 919         }
 920         dev->spu_sleep = 0;
 921         dev->spu_bit = 0;
 922         dev->udev = usb_get_dev(udev);
 923         if (!dev->udev) {
 924                 err = -ENOMEM;
 925                 goto err_out_free;
 926         }
 927         memset(dev->ep, 0, sizeof(dev->ep));
 928
 929         usb_set_intfdata(intf, dev);
 930
 931         err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 932         if (err) {
 933                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 934                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 935                 goto err_out_clear;
 936         }
 937
 938         err = usb_reset_configuration(dev->udev);
 939         if (err) {
 940                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 941                 goto err_out_clear;
 942         }
 943
 944         iface_desc = &intf->altsetting[0];
 945         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 946                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 947                 err = -EINVAL;
 948                 goto err_out_clear;
 949         }
 950
 951         /*
 952          * This loop doesn'd show control 0 endpoint,
 953          * so we will fill only 1-3 endpoints entry.
 954          */
 955         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 956                 endpoint = &iface_desc->endpoint[i].desc;
 957
 958                 dev->ep[i+1] = endpoint->bEndpointAddress;
 959 #if 0
 960                 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
 961                         i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
 962                         (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
 963                         endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 964 #endif
 965         }
 966
 967         err = ds_w1_init(dev);
 968         if (err)
 969                 goto err_out_clear;
 970
 971         mutex_lock(&ds_mutex);
 972         list_add_tail(&dev->ds_entry, &ds_devices);
 973         mutex_unlock(&ds_mutex);
 974
 975         return 0;
 976
 977 err_out_clear:
 978         usb_set_intfdata(intf, NULL);
 979         usb_put_dev(dev->udev);
 980 err_out_free:
 981         kfree(dev);
 982         return err;
 983 }
 984
 985 static void ds_disconnect(struct usb_interface *intf)
 986 {
 987         struct ds_device *dev;
 988
 989         dev = usb_get_intfdata(intf);
 990         if (!dev)
 991                 return;
 992
 993         mutex_lock(&ds_mutex);
 994         list_del(&dev->ds_entry);
 995         mutex_unlock(&ds_mutex);
 996
 997         ds_w1_fini(dev);
 998
 999         usb_set_intfdata(intf, NULL);
1000
1001         usb_put_dev(dev->udev);
1002         kfree(dev);
1003 }
1004
1005 static int ds_init(void)
1006 {
1007         int err;
1008
1009         err = usb_register(&ds_driver);
1010         if (err) {
1011                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
1012                 return err;
1013         }
1014
1015         return 0;
1016 }
1017
1018 static void ds_fini(void)
1019 {
1020         usb_deregister(&ds_driver);
1021 }
1022
1023 module_init(ds_init);
1024 module_exit(ds_fini);
1025
1026 MODULE_LICENSE("GPL");
1027 MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
1028 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");