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         /* spu_bit contains COMM_SPU or 0 depending on if the strong pullup
 145          * should be active or not for writes.
 146          */
 147         u16                     spu_bit;
 148
 149         struct w1_bus_master    master;
 150 };
 151
 152 struct ds_status
 153 {
 154         u8                      enable;
 155         u8                      speed;
 156         u8                      pullup_dur;
 157         u8                      ppuls_dur;
 158         u8                      pulldown_slew;
 159         u8                      write1_time;
 160         u8                      write0_time;
 161         u8                      reserved0;
 162         u8                      status;
 163         u8                      command0;
 164         u8                      command1;
 165         u8                      command_buffer_status;
 166         u8                      data_out_buffer_status;
 167         u8                      data_in_buffer_status;
 168         u8                      reserved1;
 169         u8                      reserved2;
 170
 171 };
 172
 173 static struct usb_device_id ds_id_table [] = {
 174         { USB_DEVICE(0x04fa, 0x2490) },
 175         { },
 176 };
 177 MODULE_DEVICE_TABLE(usb, ds_id_table);
 178
 179 static int ds_probe(struct usb_interface *, const struct usb_device_id *);
 180 static void ds_disconnect(struct usb_interface *);
 181
 182 static int ds_send_control(struct ds_device *, u16, u16);
 183 static int ds_send_control_cmd(struct ds_device *, u16, u16);
 184
 185 static LIST_HEAD(ds_devices);
 186 static DEFINE_MUTEX(ds_mutex);
 187
 188 static struct usb_driver ds_driver = {
 189         .name =         "DS9490R",
 190         .probe =        ds_probe,
 191         .disconnect =   ds_disconnect,
 192         .id_table =     ds_id_table,
 193 };
 194
 195 static int ds_send_control_cmd(struct ds_device *dev, u16 value, u16 index)
 196 {
 197         int err;
 198
 199         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 200                         CONTROL_CMD, 0x40, value, index, NULL, 0, 1000);
 201         if (err < 0) {
 202                 printk(KERN_ERR "Failed to send command control message %x.%x: err=%d.\n",
 203                                 value, index, err);
 204                 return err;
 205         }
 206
 207         return err;
 208 }
 209
 210 static int ds_send_control_mode(struct ds_device *dev, u16 value, u16 index)
 211 {
 212         int err;
 213
 214         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 215                         MODE_CMD, 0x40, value, index, NULL, 0, 1000);
 216         if (err < 0) {
 217                 printk(KERN_ERR "Failed to send mode control message %x.%x: err=%d.\n",
 218                                 value, index, err);
 219                 return err;
 220         }
 221
 222         return err;
 223 }
 224
 225 static int ds_send_control(struct ds_device *dev, u16 value, u16 index)
 226 {
 227         int err;
 228
 229         err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, dev->ep[EP_CONTROL]),
 230                         COMM_CMD, 0x40, value, index, NULL, 0, 1000);
 231         if (err < 0) {
 232                 printk(KERN_ERR "Failed to send control message %x.%x: err=%d.\n",
 233                                 value, index, err);
 234                 return err;
 235         }
 236
 237         return err;
 238 }
 239
 240 static int ds_recv_status_nodump(struct ds_device *dev, struct ds_status *st,
 241                                  unsigned char *buf, int size)
 242 {
 243         int count, err;
 244
 245         memset(st, 0, sizeof(*st));
 246
 247         count = 0;
 248         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_STATUS]), buf, size, &count, 100);
 249         if (err < 0) {
 250                 printk(KERN_ERR "Failed to read 1-wire data from 0x%x: err=%d.\n", dev->ep[EP_STATUS], err);
 251                 return err;
 252         }
 253
 254         if (count >= sizeof(*st))
 255                 memcpy(st, buf, sizeof(*st));
 256
 257         return count;
 258 }
 259
 260 static inline void ds_print_msg(unsigned char *buf, unsigned char *str, int off)
 261 {
 262         printk(KERN_INFO "%45s: %8x\n", str, buf[off]);
 263 }
 264
 265 static void ds_dump_status(struct ds_device *dev, unsigned char *buf, int count)
 266 {
 267         int i;
 268
 269         printk(KERN_INFO "0x%x: count=%d, status: ", dev->ep[EP_STATUS], count);
 270         for (i=0; i<count; ++i)
 271                 printk("%02x ", buf[i]);
 272         printk(KERN_INFO "\n");
 273
 274         if (count >= 16) {
 275                 ds_print_msg(buf, "enable flag", 0);
 276                 ds_print_msg(buf, "1-wire speed", 1);
 277                 ds_print_msg(buf, "strong pullup duration", 2);
 278                 ds_print_msg(buf, "programming pulse duration", 3);
 279                 ds_print_msg(buf, "pulldown slew rate control", 4);
 280                 ds_print_msg(buf, "write-1 low time", 5);
 281                 ds_print_msg(buf, "data sample offset/write-0 recovery time",
 282                         6);
 283                 ds_print_msg(buf, "reserved (test register)", 7);
 284                 ds_print_msg(buf, "device status flags", 8);
 285                 ds_print_msg(buf, "communication command byte 1", 9);
 286                 ds_print_msg(buf, "communication command byte 2", 10);
 287                 ds_print_msg(buf, "communication command buffer status", 11);
 288                 ds_print_msg(buf, "1-wire data output buffer status", 12);
 289                 ds_print_msg(buf, "1-wire data input buffer status", 13);
 290                 ds_print_msg(buf, "reserved", 14);
 291                 ds_print_msg(buf, "reserved", 15);
 292         }
 293         for (i = 16; i < count; ++i) {
 294                 if (buf[i] == RR_DETECT) {
 295                         ds_print_msg(buf, "new device detect", i);
 296                         continue;
 297                 }
 298                 ds_print_msg(buf, "Result Register Value: ", i);
 299                 if (buf[i] & RR_NRS)
 300                         printk(KERN_INFO "NRS: Reset no presence or ...\n");
 301                 if (buf[i] & RR_SH)
 302                         printk(KERN_INFO "SH: short on reset or set path\n");
 303                 if (buf[i] & RR_APP)
 304                         printk(KERN_INFO "APP: alarming presence on reset\n");
 305                 if (buf[i] & RR_VPP)
 306                         printk(KERN_INFO "VPP: 12V expected not seen\n");
 307                 if (buf[i] & RR_CMP)
 308                         printk(KERN_INFO "CMP: compare error\n");
 309                 if (buf[i] & RR_CRC)
 310                         printk(KERN_INFO "CRC: CRC error detected\n");
 311                 if (buf[i] & RR_RDP)
 312                         printk(KERN_INFO "RDP: redirected page\n");
 313                 if (buf[i] & RR_EOS)
 314                         printk(KERN_INFO "EOS: end of search error\n");
 315         }
 316 }
 317
 318 static void ds_reset_device(struct ds_device *dev)
 319 {
 320         ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 321         /* Always allow strong pullup which allow individual writes to use
 322          * the strong pullup.
 323          */
 324         if (ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE))
 325                 printk(KERN_ERR "ds_reset_device: "
 326                         "Error allowing strong pullup\n");
 327         /* Chip strong pullup time was cleared. */
 328         if (dev->spu_sleep) {
 329                 /* lower 4 bits are 0, see ds_set_pullup */
 330                 u8 del = dev->spu_sleep>>4;
 331                 if (ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del))
 332                         printk(KERN_ERR "ds_reset_device: "
 333                                 "Error setting duration\n");
 334         }
 335 }
 336
 337 static int ds_recv_data(struct ds_device *dev, unsigned char *buf, int size)
 338 {
 339         int count, err;
 340         struct ds_status st;
 341
 342         /* Careful on size.  If size is less than what is available in
 343          * the input buffer, the device fails the bulk transfer and
 344          * clears the input buffer.  It could read the maximum size of
 345          * the data buffer, but then do you return the first, last, or
 346          * some set of the middle size bytes?  As long as the rest of
 347          * the code is correct there will be size bytes waiting.  A
 348          * call to ds_wait_status will wait until the device is idle
 349          * and any data to be received would have been available.
 350          */
 351         count = 0;
 352         err = usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]),
 353                                 buf, size, &count, 1000);
 354         if (err < 0) {
 355                 u8 buf[0x20];
 356                 int count;
 357
 358                 printk(KERN_INFO "Clearing ep0x%x.\n", dev->ep[EP_DATA_IN]);
 359                 usb_clear_halt(dev->udev, usb_rcvbulkpipe(dev->udev, dev->ep[EP_DATA_IN]));
 360
 361                 count = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 362                 ds_dump_status(dev, buf, count);
 363                 return err;
 364         }
 365
 366 #if 0
 367         {
 368                 int i;
 369
 370                 printk("%s: count=%d: ", __func__, count);
 371                 for (i=0; i<count; ++i)
 372                         printk("%02x ", buf[i]);
 373                 printk("\n");
 374         }
 375 #endif
 376         return count;
 377 }
 378
 379 static int ds_send_data(struct ds_device *dev, unsigned char *buf, int len)
 380 {
 381         int count, err;
 382
 383         count = 0;
 384         err = usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, dev->ep[EP_DATA_OUT]), buf, len, &count, 1000);
 385         if (err < 0) {
 386                 printk(KERN_ERR "Failed to write 1-wire data to ep0x%x: "
 387                         "err=%d.\n", dev->ep[EP_DATA_OUT], err);
 388                 return err;
 389         }
 390
 391         return err;
 392 }
 393
 394 #if 0
 395
 396 int ds_stop_pulse(struct ds_device *dev, int limit)
 397 {
 398         struct ds_status st;
 399         int count = 0, err = 0;
 400         u8 buf[0x20];
 401
 402         do {
 403                 err = ds_send_control(dev, CTL_HALT_EXE_IDLE, 0);
 404                 if (err)
 405                         break;
 406                 err = ds_send_control(dev, CTL_RESUME_EXE, 0);
 407                 if (err)
 408                         break;
 409                 err = ds_recv_status_nodump(dev, &st, buf, sizeof(buf));
 410                 if (err)
 411                         break;
 412
 413                 if ((st.status & ST_SPUA) == 0) {
 414                         err = ds_send_control_mode(dev, MOD_PULSE_EN, 0);
 415                         if (err)
 416                                 break;
 417                 }
 418         } while(++count < limit);
 419
 420         return err;
 421 }
 422
 423 int ds_detect(struct ds_device *dev, struct ds_status *st)
 424 {
 425         int err;
 426
 427         err = ds_send_control_cmd(dev, CTL_RESET_DEVICE, 0);
 428         if (err)
 429                 return err;
 430
 431         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, 0);
 432         if (err)
 433                 return err;
 434
 435         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM | COMM_TYPE, 0x40);
 436         if (err)
 437                 return err;
 438
 439         err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_PROG);
 440         if (err)
 441                 return err;
 442
 443         err = ds_dump_status(dev, st);
 444
 445         return err;
 446 }
 447
 448 #endif  /*  0  */
 449
 450 static int ds_wait_status(struct ds_device *dev, struct ds_status *st)
 451 {
 452         u8 buf[0x20];
 453         int err, count = 0;
 454
 455         do {
 456                 err = ds_recv_status_nodump(dev, st, buf, sizeof(buf));
 457 #if 0
 458                 if (err >= 0) {
 459                         int i;
 460                         printk("0x%x: count=%d, status: ", dev->ep[EP_STATUS], err);
 461                         for (i=0; i<err; ++i)
 462                                 printk("%02x ", buf[i]);
 463                         printk("\n");
 464                 }
 465 #endif
 466         } while (!(buf[0x08] & ST_IDLE) && !(err < 0) && ++count < 100);
 467
 468         if (err >= 16 && st->status & ST_EPOF) {
 469                 printk(KERN_INFO "Resetting device after ST_EPOF.\n");
 470                 ds_reset_device(dev);
 471                 /* Always dump the device status. */
 472                 count = 101;
 473         }
 474
 475         /* Dump the status for errors or if there is extended return data.
 476          * The extended status includes new device detection (maybe someone
 477          * can do something with it).
 478          */
 479         if (err > 16 || count >= 100 || err < 0)
 480                 ds_dump_status(dev, buf, err);
 481
 482         /* Extended data isn't an error.  Well, a short is, but the dump
 483          * would have already told the user that and we can't do anything
 484          * about it in software anyway.
 485          */
 486         if (count >= 100 || err < 0)
 487                 return -1;
 488         else
 489                 return 0;
 490 }
 491
 492 static int ds_reset(struct ds_device *dev)
 493 {
 494         int err;
 495
 496         /* Other potentionally interesting flags for reset.
 497          *
 498          * COMM_NTF: Return result register feedback.  This could be used to
 499          * detect some conditions such as short, alarming presence, or
 500          * detect if a new device was detected.
 501          *
 502          * COMM_SE which allows SPEED_NORMAL, SPEED_FLEXIBLE, SPEED_OVERDRIVE:
 503          * Select the data transfer rate.
 504          */
 505         err = ds_send_control(dev, COMM_1_WIRE_RESET | COMM_IM, SPEED_NORMAL);
 506         if (err)
 507                 return err;
 508
 509         return 0;
 510 }
 511
 512 #if 0
 513 static int ds_set_speed(struct ds_device *dev, int speed)
 514 {
 515         int err;
 516
 517         if (speed != SPEED_NORMAL && speed != SPEED_FLEXIBLE && speed != SPEED_OVERDRIVE)
 518                 return -EINVAL;
 519
 520         if (speed != SPEED_OVERDRIVE)
 521                 speed = SPEED_FLEXIBLE;
 522
 523         speed &= 0xff;
 524
 525         err = ds_send_control_mode(dev, MOD_1WIRE_SPEED, speed);
 526         if (err)
 527                 return err;
 528
 529         return err;
 530 }
 531 #endif  /*  0  */
 532
 533 static int ds_set_pullup(struct ds_device *dev, int delay)
 534 {
 535         int err = 0;
 536         u8 del = 1 + (u8)(delay >> 4);
 537         /* Just storing delay would not get the trunication and roundup. */
 538         int ms = del<<4;
 539
 540         /* Enable spu_bit if a delay is set. */
 541         dev->spu_bit = delay ? COMM_SPU : 0;
 542         /* If delay is zero, it has already been disabled, if the time is
 543          * the same as the hardware was last programmed to, there is also
 544          * nothing more to do.  Compare with the recalculated value ms
 545          * rather than del or delay which can have a different value.
 546          */
 547         if (delay == 0 || ms == dev->spu_sleep)
 548                 return err;
 549
 550         err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
 551         if (err)
 552                 return err;
 553
 554         dev->spu_sleep = ms;
 555
 556         return err;
 557 }
 558
 559 static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
 560 {
 561         int err;
 562         struct ds_status st;
 563
 564         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit ? COMM_D : 0),
 565                 0);
 566         if (err)
 567                 return err;
 568
 569         ds_wait_status(dev, &st);
 570
 571         err = ds_recv_data(dev, tbit, sizeof(*tbit));
 572         if (err < 0)
 573                 return err;
 574
 575         return 0;
 576 }
 577
 578 #if 0
 579 static int ds_write_bit(struct ds_device *dev, u8 bit)
 580 {
 581         int err;
 582         struct ds_status st;
 583
 584         /* Set COMM_ICP to write without a readback.  Note, this will
 585          * produce one time slot, a down followed by an up with COMM_D
 586          * only determing the timing.
 587          */
 588         err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | COMM_ICP |
 589                 (bit ? COMM_D : 0), 0);
 590         if (err)
 591                 return err;
 592
 593         ds_wait_status(dev, &st);
 594
 595         return 0;
 596 }
 597 #endif
 598
 599 static int ds_write_byte(struct ds_device *dev, u8 byte)
 600 {
 601         int err;
 602         struct ds_status st;
 603         u8 rbyte;
 604
 605         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | dev->spu_bit, byte);
 606         if (err)
 607                 return err;
 608
 609         if (dev->spu_bit)
 610                 msleep(dev->spu_sleep);
 611
 612         err = ds_wait_status(dev, &st);
 613         if (err)
 614                 return err;
 615
 616         err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
 617         if (err < 0)
 618                 return err;
 619
 620         return !(byte == rbyte);
 621 }
 622
 623 static int ds_read_byte(struct ds_device *dev, u8 *byte)
 624 {
 625         int err;
 626         struct ds_status st;
 627
 628         err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
 629         if (err)
 630                 return err;
 631
 632         ds_wait_status(dev, &st);
 633
 634         err = ds_recv_data(dev, byte, sizeof(*byte));
 635         if (err < 0)
 636                 return err;
 637
 638         return 0;
 639 }
 640
 641 static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
 642 {
 643         struct ds_status st;
 644         int err;
 645
 646         if (len > 64*1024)
 647                 return -E2BIG;
 648
 649         memset(buf, 0xFF, len);
 650
 651         err = ds_send_data(dev, buf, len);
 652         if (err < 0)
 653                 return err;
 654
 655         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM, len);
 656         if (err)
 657                 return err;
 658
 659         ds_wait_status(dev, &st);
 660
 661         memset(buf, 0x00, len);
 662         err = ds_recv_data(dev, buf, len);
 663
 664         return err;
 665 }
 666
 667 static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
 668 {
 669         int err;
 670         struct ds_status st;
 671
 672         err = ds_send_data(dev, buf, len);
 673         if (err < 0)
 674                 return err;
 675
 676         err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | dev->spu_bit, len);
 677         if (err)
 678                 return err;
 679
 680         if (dev->spu_bit)
 681                 msleep(dev->spu_sleep);
 682
 683         ds_wait_status(dev, &st);
 684
 685         err = ds_recv_data(dev, buf, len);
 686         if (err < 0)
 687                 return err;
 688
 689         return !(err == len);
 690 }
 691
 692 #if 0
 693
 694 static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
 695 {
 696         int err;
 697         u16 value, index;
 698         struct ds_status st;
 699
 700         memset(buf, 0, sizeof(buf));
 701
 702         err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
 703         if (err)
 704                 return err;
 705
 706         ds_wait_status(ds_dev, &st);
 707
 708         value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
 709         index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
 710         err = ds_send_control(ds_dev, value, index);
 711         if (err)
 712                 return err;
 713
 714         ds_wait_status(ds_dev, &st);
 715
 716         err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
 717         if (err < 0)
 718                 return err;
 719
 720         return err/8;
 721 }
 722
 723 static int ds_match_access(struct ds_device *dev, u64 init)
 724 {
 725         int err;
 726         struct ds_status st;
 727
 728         err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
 729         if (err)
 730                 return err;
 731
 732         ds_wait_status(dev, &st);
 733
 734         err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
 735         if (err)
 736                 return err;
 737
 738         ds_wait_status(dev, &st);
 739
 740         return 0;
 741 }
 742
 743 static int ds_set_path(struct ds_device *dev, u64 init)
 744 {
 745         int err;
 746         struct ds_status st;
 747         u8 buf[9];
 748
 749         memcpy(buf, &init, 8);
 750         buf[8] = BRANCH_MAIN;
 751
 752         err = ds_send_data(dev, buf, sizeof(buf));
 753         if (err)
 754                 return err;
 755
 756         ds_wait_status(dev, &st);
 757
 758         err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
 759         if (err)
 760                 return err;
 761
 762         ds_wait_status(dev, &st);
 763
 764         return 0;
 765 }
 766
 767 #endif  /*  0  */
 768
 769 static u8 ds9490r_touch_bit(void *data, u8 bit)
 770 {
 771         u8 ret;
 772         struct ds_device *dev = data;
 773
 774         if (ds_touch_bit(dev, bit, &ret))
 775                 return 0;
 776
 777         return ret;
 778 }
 779
 780 #if 0
 781 static void ds9490r_write_bit(void *data, u8 bit)
 782 {
 783         struct ds_device *dev = data;
 784
 785         ds_write_bit(dev, bit);
 786 }
 787
 788 static u8 ds9490r_read_bit(void *data)
 789 {
 790         struct ds_device *dev = data;
 791         int err;
 792         u8 bit = 0;
 793
 794         err = ds_touch_bit(dev, 1, &bit);
 795         if (err)
 796                 return 0;
 797
 798         return bit & 1;
 799 }
 800 #endif
 801
 802 static void ds9490r_write_byte(void *data, u8 byte)
 803 {
 804         struct ds_device *dev = data;
 805
 806         ds_write_byte(dev, byte);
 807 }
 808
 809 static u8 ds9490r_read_byte(void *data)
 810 {
 811         struct ds_device *dev = data;
 812         int err;
 813         u8 byte = 0;
 814
 815         err = ds_read_byte(dev, &byte);
 816         if (err)
 817                 return 0;
 818
 819         return byte;
 820 }
 821
 822 static void ds9490r_write_block(void *data, const u8 *buf, int len)
 823 {
 824         struct ds_device *dev = data;
 825
 826         ds_write_block(dev, (u8 *)buf, len);
 827 }
 828
 829 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
 830 {
 831         struct ds_device *dev = data;
 832         int err;
 833
 834         err = ds_read_block(dev, buf, len);
 835         if (err < 0)
 836                 return 0;
 837
 838         return len;
 839 }
 840
 841 static u8 ds9490r_reset(void *data)
 842 {
 843         struct ds_device *dev = data;
 844         int err;
 845
 846         err = ds_reset(dev);
 847         if (err)
 848                 return 1;
 849
 850         return 0;
 851 }
 852
 853 static u8 ds9490r_set_pullup(void *data, int delay)
 854 {
 855         struct ds_device *dev = data;
 856
 857         if (ds_set_pullup(dev, delay))
 858                 return 1;
 859
 860         return 0;
 861 }
 862
 863 static int ds_w1_init(struct ds_device *dev)
 864 {
 865         memset(&dev->master, 0, sizeof(struct w1_bus_master));
 866
 867         /* Reset the device as it can be in a bad state.
 868          * This is necessary because a block write will wait for data
 869          * to be placed in the output buffer and block any later
 870          * commands which will keep accumulating and the device will
 871          * not be idle.  Another case is removing the ds2490 module
 872          * while a bus search is in progress, somehow a few commands
 873          * get through, but the input transfers fail leaving data in
 874          * the input buffer.  This will cause the next read to fail
 875          * see the note in ds_recv_data.
 876          */
 877         ds_reset_device(dev);
 878
 879         dev->master.data        = dev;
 880         dev->master.touch_bit   = &ds9490r_touch_bit;
 881         /* read_bit and write_bit in w1_bus_master are expected to set and
 882          * sample the line level.  For write_bit that means it is expected to
 883          * set it to that value and leave it there.  ds2490 only supports an
 884          * individual time slot at the lowest level.  The requirement from
 885          * pulling the bus state down to reading the state is 15us, something
 886          * that isn't realistic on the USB bus anyway.
 887         dev->master.read_bit    = &ds9490r_read_bit;
 888         dev->master.write_bit   = &ds9490r_write_bit;
 889         */
 890         dev->master.read_byte   = &ds9490r_read_byte;
 891         dev->master.write_byte  = &ds9490r_write_byte;
 892         dev->master.read_block  = &ds9490r_read_block;
 893         dev->master.write_block = &ds9490r_write_block;
 894         dev->master.reset_bus   = &ds9490r_reset;
 895         dev->master.set_pullup  = &ds9490r_set_pullup;
 896
 897         return w1_add_master_device(&dev->master);
 898 }
 899
 900 static void ds_w1_fini(struct ds_device *dev)
 901 {
 902         w1_remove_master_device(&dev->master);
 903 }
 904
 905 static int ds_probe(struct usb_interface *intf,
 906                     const struct usb_device_id *udev_id)
 907 {
 908         struct usb_device *udev = interface_to_usbdev(intf);
 909         struct usb_endpoint_descriptor *endpoint;
 910         struct usb_host_interface *iface_desc;
 911         struct ds_device *dev;
 912         int i, err;
 913
 914         dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
 915         if (!dev) {
 916                 printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
 917                 return -ENOMEM;
 918         }
 919         dev->spu_sleep = 0;
 920         dev->spu_bit = 0;
 921         dev->udev = usb_get_dev(udev);
 922         if (!dev->udev) {
 923                 err = -ENOMEM;
 924                 goto err_out_free;
 925         }
 926         memset(dev->ep, 0, sizeof(dev->ep));
 927
 928         usb_set_intfdata(intf, dev);
 929
 930         err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
 931         if (err) {
 932                 printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
 933                                 intf->altsetting[0].desc.bInterfaceNumber, err);
 934                 goto err_out_clear;
 935         }
 936
 937         err = usb_reset_configuration(dev->udev);
 938         if (err) {
 939                 printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
 940                 goto err_out_clear;
 941         }
 942
 943         iface_desc = &intf->altsetting[0];
 944         if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
 945                 printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
 946                 err = -EINVAL;
 947                 goto err_out_clear;
 948         }
 949
 950         /*
 951          * This loop doesn'd show control 0 endpoint,
 952          * so we will fill only 1-3 endpoints entry.
 953          */
 954         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 955                 endpoint = &iface_desc->endpoint[i].desc;
 956
 957                 dev->ep[i+1] = endpoint->bEndpointAddress;
 958 #if 0
 959                 printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
 960                         i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
 961                         (endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
 962                         endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
 963 #endif
 964         }
 965
 966         err = ds_w1_init(dev);
 967         if (err)
 968                 goto err_out_clear;
 969
 970         mutex_lock(&ds_mutex);
 971         list_add_tail(&dev->ds_entry, &ds_devices);
 972         mutex_unlock(&ds_mutex);
 973
 974         return 0;
 975
 976 err_out_clear:
 977         usb_set_intfdata(intf, NULL);
 978         usb_put_dev(dev->udev);
 979 err_out_free:
 980         kfree(dev);
 981         return err;
 982 }
 983
 984 static void ds_disconnect(struct usb_interface *intf)
 985 {
 986         struct ds_device *dev;
 987
 988         dev = usb_get_intfdata(intf);
 989         if (!dev)
 990                 return;
 991
 992         mutex_lock(&ds_mutex);
 993         list_del(&dev->ds_entry);
 994         mutex_unlock(&ds_mutex);
 995
 996         ds_w1_fini(dev);
 997
 998         usb_set_intfdata(intf, NULL);
 999
1000         usb_put_dev(dev->udev);
1001         kfree(dev);
1002 }
1003
1004 static int ds_init(void)
1005 {
1006         int err;
1007
1008         err = usb_register(&ds_driver);
1009         if (err) {
1010                 printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
1011                 return err;
1012         }
1013
1014         return 0;
1015 }
1016
1017 static void ds_fini(void)
1018 {
1019         usb_deregister(&ds_driver);
1020 }
1021
1022 module_init(ds_init);
1023 module_exit(ds_fini);
1024
1025 MODULE_LICENSE("GPL");
1026 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
1027 MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");