drivers/staging/rts5139/rts51x_transport.c

   1 /* Driver for Realtek RTS51xx USB card reader
   2  *
   3  * Copyright(c) 2009 Realtek Semiconductor Corp. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2, or (at your option) any
   8  * later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author:
  19  *   wwang (wei_wang@realsil.com.cn)
  20  *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
  21  * Maintainer:
  22  *   Edwin Rong (edwin_rong@realsil.com.cn)
  23  *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
  24  */
  25
  26 #include <linux/blkdev.h>
  27 #include <linux/kthread.h>
  28 #include <linux/sched.h>
  29 #include <linux/slab.h>
  30
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_eh.h>
  33 #include <scsi/scsi_device.h>
  34
  35 #include "debug.h"
  36 #include "rts51x.h"
  37 #include "rts51x_chip.h"
  38 #include "rts51x_card.h"
  39 #include "rts51x_scsi.h"
  40 #include "rts51x_transport.h"
  41 #include "trace.h"
  42
  43 /***********************************************************************
  44  * Scatter-gather transfer buffer access routines
  45  ***********************************************************************/
  46
  47 /* Copy a buffer of length buflen to/from the srb's transfer buffer.
  48  * Update the **sgptr and *offset variables so that the next copy will
  49  * pick up from where this one left off.
  50  */
  51
  52 unsigned int rts51x_access_sglist(unsigned char *buffer,
  53                                   unsigned int buflen, void *sglist,
  54                                   void **sgptr, unsigned int *offset,
  55                                   enum xfer_buf_dir dir)
  56 {
  57         unsigned int cnt;
  58         struct scatterlist *sg = (struct scatterlist *)*sgptr;
  59
  60         /* We have to go through the list one entry
  61          * at a time.  Each s-g entry contains some number of pages, and
  62          * each page has to be kmap()'ed separately.  If the page is already
  63          * in kernel-addressable memory then kmap() will return its address.
  64          * If the page is not directly accessible -- such as a user buffer
  65          * located in high memory -- then kmap() will map it to a temporary
  66          * position in the kernel's virtual address space.
  67          */
  68
  69         if (!sg)
  70                 sg = (struct scatterlist *)sglist;
  71
  72         /* This loop handles a single s-g list entry, which may
  73          * include multiple pages.  Find the initial page structure
  74          * and the starting offset within the page, and update
  75          * the *offset and **sgptr values for the next loop.
  76          */
  77         cnt = 0;
  78         while (cnt < buflen && sg) {
  79                 struct page *page = sg_page(sg) +
  80                     ((sg->offset + *offset) >> PAGE_SHIFT);
  81                 unsigned int poff = (sg->offset + *offset) & (PAGE_SIZE - 1);
  82                 unsigned int sglen = sg->length - *offset;
  83
  84                 if (sglen > buflen - cnt) {
  85
  86                         /* Transfer ends within this s-g entry */
  87                         sglen = buflen - cnt;
  88                         *offset += sglen;
  89                 } else {
  90
  91                         /* Transfer continues to next s-g entry */
  92                         *offset = 0;
  93                         sg = sg_next(sg);
  94                 }
  95
  96                 /* Transfer the data for all the pages in this
  97                  * s-g entry.  For each page: call kmap(), do the
  98                  * transfer, and call kunmap() immediately after. */
  99                 while (sglen > 0) {
 100                         unsigned int plen = min(sglen, (unsigned int)
 101                                                 PAGE_SIZE - poff);
 102                         unsigned char *ptr = kmap(page);
 103
 104                         if (dir == TO_XFER_BUF)
 105                                 memcpy(ptr + poff, buffer + cnt, plen);
 106                         else
 107                                 memcpy(buffer + cnt, ptr + poff, plen);
 108                         kunmap(page);
 109
 110                         /* Start at the beginning of the next page */
 111                         poff = 0;
 112                         ++page;
 113                         cnt += plen;
 114                         sglen -= plen;
 115                 }
 116         }
 117         *sgptr = sg;
 118
 119         /* Return the amount actually transferred */
 120         return cnt;
 121 }
 122
 123 static unsigned int rts51x_access_xfer_buf(unsigned char *buffer,
 124                                     unsigned int buflen, struct scsi_cmnd *srb,
 125                                     struct scatterlist **sgptr,
 126                                     unsigned int *offset, enum xfer_buf_dir dir)
 127 {
 128         return rts51x_access_sglist(buffer, buflen, (void *)scsi_sglist(srb),
 129                                     (void **)sgptr, offset, dir);
 130 }
 131
 132 /* Store the contents of buffer into srb's transfer buffer and set the
 133  * SCSI residue.
 134  */
 135 void rts51x_set_xfer_buf(unsigned char *buffer,
 136                          unsigned int buflen, struct scsi_cmnd *srb)
 137 {
 138         unsigned int offset = 0;
 139         struct scatterlist *sg = NULL;
 140
 141         buflen = min(buflen, scsi_bufflen(srb));
 142         buflen = rts51x_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
 143                                         TO_XFER_BUF);
 144         if (buflen < scsi_bufflen(srb))
 145                 scsi_set_resid(srb, scsi_bufflen(srb) - buflen);
 146 }
 147
 148 void rts51x_get_xfer_buf(unsigned char *buffer,
 149                          unsigned int buflen, struct scsi_cmnd *srb)
 150 {
 151         unsigned int offset = 0;
 152         struct scatterlist *sg = NULL;
 153
 154         buflen = min(buflen, scsi_bufflen(srb));
 155         buflen = rts51x_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
 156                                         FROM_XFER_BUF);
 157         if (buflen < scsi_bufflen(srb))
 158                 scsi_set_resid(srb, scsi_bufflen(srb) - buflen);
 159 }
 160
 161 /* This is the completion handler which will wake us up when an URB
 162  * completes.
 163  */
 164 static void urb_done_completion(struct urb *urb)
 165 {
 166         struct completion *urb_done_ptr = urb->context;
 167
 168         if (urb_done_ptr)
 169                 complete(urb_done_ptr);
 170 }
 171
 172 /* This is the common part of the URB message submission code
 173  *
 174  * All URBs from the driver involved in handling a queued scsi
 175  * command _must_ pass through this function (or something like it) for the
 176  * abort mechanisms to work properly.
 177  */
 178 static int rts51x_msg_common(struct rts51x_chip *chip, struct urb *urb,
 179                              int timeout)
 180 {
 181         struct rts51x_usb *rts51x = chip->usb;
 182         struct completion urb_done;
 183         long timeleft;
 184         int status;
 185
 186         /* don't submit URBs during abort processing */
 187         if (test_bit(FLIDX_ABORTING, &rts51x->dflags))
 188                 TRACE_RET(chip, -EIO);
 189
 190         /* set up data structures for the wakeup system */
 191         init_completion(&urb_done);
 192
 193         /* fill the common fields in the URB */
 194         urb->context = &urb_done;
 195         urb->actual_length = 0;
 196         urb->error_count = 0;
 197         urb->status = 0;
 198
 199         /* we assume that if transfer_buffer isn't us->iobuf then it
 200          * hasn't been mapped for DMA.  Yes, this is clunky, but it's
 201          * easier than always having the caller tell us whether the
 202          * transfer buffer has already been mapped. */
 203         urb->transfer_flags = URB_NO_SETUP_DMA_MAP;
 204         if (urb->transfer_buffer == rts51x->iobuf) {
 205                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 206                 urb->transfer_dma = rts51x->iobuf_dma;
 207         }
 208         urb->setup_dma = rts51x->cr_dma;
 209
 210         /* submit the URB */
 211         status = usb_submit_urb(urb, GFP_NOIO);
 212         if (status) {
 213                 /* something went wrong */
 214                 TRACE_RET(chip, status);
 215         }
 216
 217         /* since the URB has been submitted successfully, it's now okay
 218          * to cancel it */
 219         set_bit(FLIDX_URB_ACTIVE, &rts51x->dflags);
 220
 221         /* did an abort occur during the submission? */
 222         if (test_bit(FLIDX_ABORTING, &rts51x->dflags)) {
 223
 224                 /* cancel the URB, if it hasn't been cancelled already */
 225                 if (test_and_clear_bit(FLIDX_URB_ACTIVE, &rts51x->dflags)) {
 226                         RTS51X_DEBUGP("-- cancelling URB\n");
 227                         usb_unlink_urb(urb);
 228                 }
 229         }
 230
 231         /* wait for the completion of the URB */
 232         timeleft =
 233             wait_for_completion_interruptible_timeout(&urb_done,
 234                                                       (timeout * HZ /
 235                                                        1000) ? :
 236                                                       MAX_SCHEDULE_TIMEOUT);
 237
 238         clear_bit(FLIDX_URB_ACTIVE, &rts51x->dflags);
 239
 240         if (timeleft <= 0) {
 241                 RTS51X_DEBUGP("%s -- cancelling URB\n",
 242                                timeleft == 0 ? "Timeout" : "Signal");
 243                 usb_kill_urb(urb);
 244                 if (timeleft == 0)
 245                         status = -ETIMEDOUT;
 246                 else
 247                         status = -EINTR;
 248         } else {
 249                 status = urb->status;
 250         }
 251
 252         return status;
 253 }
 254
 255 static int rts51x_clear_halt(struct rts51x_chip *chip, unsigned int pipe);
 256
 257 /*
 258  * Interpret the results of a URB transfer
 259  */
 260 static int interpret_urb_result(struct rts51x_chip *chip, unsigned int pipe,
 261                                 unsigned int length, int result,
 262                                 unsigned int partial)
 263 {
 264         int retval = STATUS_SUCCESS;
 265
 266         /* RTS51X_DEBUGP("Status code %d; transferred %u/%u\n",
 267                                 result, partial, length); */
 268         switch (result) {
 269                 /* no error code; did we send all the data? */
 270         case 0:
 271                 if (partial != length) {
 272                         RTS51X_DEBUGP("-- short transfer\n");
 273                         TRACE_RET(chip, STATUS_TRANS_SHORT);
 274                 }
 275                 /* RTS51X_DEBUGP("-- transfer complete\n"); */
 276                 return STATUS_SUCCESS;
 277                 /* stalled */
 278         case -EPIPE:
 279                 /* for control endpoints, (used by CB[I]) a stall indicates
 280                  * a failed command */
 281                 if (usb_pipecontrol(pipe)) {
 282                         RTS51X_DEBUGP("-- stall on control pipe\n");
 283                         TRACE_RET(chip, STATUS_STALLED);
 284                 }
 285                 /* for other sorts of endpoint, clear the stall */
 286                 RTS51X_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
 287                 if (rts51x_clear_halt(chip, pipe) < 0)
 288                         TRACE_RET(chip, STATUS_ERROR);
 289                 retval = STATUS_STALLED;
 290                 TRACE_GOTO(chip, Exit);
 291
 292                 /* babble - the device tried to send more than
 293                  * we wanted to read */
 294         case -EOVERFLOW:
 295                 RTS51X_DEBUGP("-- babble\n");
 296                 retval = STATUS_TRANS_LONG;
 297                 TRACE_GOTO(chip, Exit);
 298
 299                 /* the transfer was cancelled by abort,
 300                  * disconnect, or timeout */
 301         case -ECONNRESET:
 302                 RTS51X_DEBUGP("-- transfer cancelled\n");
 303                 retval = STATUS_ERROR;
 304                 TRACE_GOTO(chip, Exit);
 305
 306                 /* short scatter-gather read transfer */
 307         case -EREMOTEIO:
 308                 RTS51X_DEBUGP("-- short read transfer\n");
 309                 retval = STATUS_TRANS_SHORT;
 310                 TRACE_GOTO(chip, Exit);
 311
 312                 /* abort or disconnect in progress */
 313         case -EIO:
 314                 RTS51X_DEBUGP("-- abort or disconnect in progress\n");
 315                 retval = STATUS_ERROR;
 316                 TRACE_GOTO(chip, Exit);
 317
 318         case -ETIMEDOUT:
 319                 RTS51X_DEBUGP("-- time out\n");
 320                 retval = STATUS_TIMEDOUT;
 321                 TRACE_GOTO(chip, Exit);
 322
 323                 /* the catch-all error case */
 324         default:
 325                 RTS51X_DEBUGP("-- unknown error\n");
 326                 retval = STATUS_ERROR;
 327                 TRACE_GOTO(chip, Exit);
 328         }
 329
 330 Exit:
 331         if ((retval != STATUS_SUCCESS) && !usb_pipecontrol(pipe))
 332                 rts51x_clear_hw_error(chip);
 333
 334         return retval;
 335 }
 336
 337 int rts51x_ctrl_transfer(struct rts51x_chip *chip, unsigned int pipe,
 338                          u8 request, u8 requesttype, u16 value, u16 index,
 339                          void *data, u16 size, int timeout)
 340 {
 341         struct rts51x_usb *rts51x = chip->usb;
 342         int result;
 343
 344         RTS51X_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
 345                        __func__, request, requesttype, value, index, size);
 346
 347         /* fill in the devrequest structure */
 348         rts51x->cr->bRequestType = requesttype;
 349         rts51x->cr->bRequest = request;
 350         rts51x->cr->wValue = cpu_to_le16(value);
 351         rts51x->cr->wIndex = cpu_to_le16(index);
 352         rts51x->cr->wLength = cpu_to_le16(size);
 353
 354         /* fill and submit the URB */
 355         usb_fill_control_urb(rts51x->current_urb, rts51x->pusb_dev, pipe,
 356                              (unsigned char *)rts51x->cr, data, size,
 357                              urb_done_completion, NULL);
 358         result = rts51x_msg_common(chip, rts51x->current_urb, timeout);
 359
 360         return interpret_urb_result(chip, pipe, size, result,
 361                                     rts51x->current_urb->actual_length);
 362 }
 363
 364 static int rts51x_clear_halt(struct rts51x_chip *chip, unsigned int pipe)
 365 {
 366         int result;
 367         int endp = usb_pipeendpoint(pipe);
 368
 369         if (usb_pipein(pipe))
 370                 endp |= USB_DIR_IN;
 371
 372         result = rts51x_ctrl_transfer(chip, SND_CTRL_PIPE(chip),
 373                                       USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
 374                                       USB_ENDPOINT_HALT, endp, NULL, 0, 3000);
 375         if (result != STATUS_SUCCESS)
 376                 TRACE_RET(chip, STATUS_FAIL);
 377
 378         usb_reset_endpoint(chip->usb->pusb_dev, endp);
 379
 380         return STATUS_SUCCESS;
 381 }
 382
 383 static void rts51x_sg_clean(struct usb_sg_request *io)
 384 {
 385         if (io->urbs) {
 386                 while (io->entries--)
 387                         usb_free_urb(io->urbs[io->entries]);
 388                 kfree(io->urbs);
 389                 io->urbs = NULL;
 390         }
 391         io->dev = NULL;
 392 }
 393
 394 static int rts51x_sg_init(struct usb_sg_request *io, struct usb_device *dev,
 395                    unsigned pipe, unsigned period, struct scatterlist *sg,
 396                    int nents, size_t length, gfp_t mem_flags)
 397 {
 398         return usb_sg_init(io, dev, pipe, period, sg, nents, length, mem_flags);
 399 }
 400
 401 static int rts51x_sg_wait(struct usb_sg_request *io, int timeout)
 402 {
 403         long timeleft;
 404         int i;
 405         int entries = io->entries;
 406
 407         /* queue the urbs.  */
 408         spin_lock_irq(&io->lock);
 409         i = 0;
 410         while (i < entries && !io->status) {
 411                 int retval;
 412
 413                 io->urbs[i]->dev = io->dev;
 414                 retval = usb_submit_urb(io->urbs[i], GFP_ATOMIC);
 415
 416                 /* after we submit, let completions or cancelations fire;
 417                  * we handshake using io->status.
 418                  */
 419                 spin_unlock_irq(&io->lock);
 420                 switch (retval) {
 421                         /* maybe the retry will recover */
 422                 case -ENXIO:    /* hc didn't queue this one */
 423                 case -EAGAIN:
 424                 case -ENOMEM:
 425                         io->urbs[i]->dev = NULL;
 426                         retval = 0;
 427                         yield();
 428                         break;
 429
 430                         /* no error? continue immediately.
 431                          *
 432                          * NOTE: to work better with UHCI (4K I/O buffer may
 433                          * need 3K of TDs) it may be good to limit how many
 434                          * URBs are queued at once; N milliseconds?
 435                          */
 436                 case 0:
 437                         ++i;
 438                         cpu_relax();
 439                         break;
 440
 441                         /* fail any uncompleted urbs */
 442                 default:
 443                         io->urbs[i]->dev = NULL;
 444                         io->urbs[i]->status = retval;
 445                         dev_dbg(&io->dev->dev, "%s, submit --> %d\n",
 446                                 __func__, retval);
 447                         usb_sg_cancel(io);
 448                 }
 449                 spin_lock_irq(&io->lock);
 450                 if (retval && (io->status == 0 || io->status == -ECONNRESET))
 451                         io->status = retval;
 452         }
 453         io->count -= entries - i;
 454         if (io->count == 0)
 455                 complete(&io->complete);
 456         spin_unlock_irq(&io->lock);
 457
 458         timeleft =
 459             wait_for_completion_interruptible_timeout(&io->complete,
 460                                                       (timeout * HZ /
 461                                                        1000) ? :
 462                                                       MAX_SCHEDULE_TIMEOUT);
 463         if (timeleft <= 0) {
 464                 RTS51X_DEBUGP("%s -- cancelling SG request\n",
 465                                timeleft == 0 ? "Timeout" : "Signal");
 466                 usb_sg_cancel(io);
 467                 if (timeleft == 0)
 468                         io->status = -ETIMEDOUT;
 469                 else
 470                         io->status = -EINTR;
 471         }
 472
 473         rts51x_sg_clean(io);
 474         return io->status;
 475 }
 476
 477 /*
 478  * Transfer a scatter-gather list via bulk transfer
 479  *
 480  * This function does basically the same thing as usb_stor_bulk_transfer_buf()
 481  * above, but it uses the usbcore scatter-gather library.
 482  */
 483 static int rts51x_bulk_transfer_sglist(struct rts51x_chip *chip,
 484                                        unsigned int pipe,
 485                                        struct scatterlist *sg, int num_sg,
 486                                        unsigned int length,
 487                                        unsigned int *act_len, int timeout)
 488 {
 489         int result;
 490
 491         /* don't submit s-g requests during abort processing */
 492         if (test_bit(FLIDX_ABORTING, &chip->usb->dflags))
 493                 TRACE_RET(chip, STATUS_ERROR);
 494
 495         /* initialize the scatter-gather request block */
 496         RTS51X_DEBUGP("%s: xfer %u bytes, %d entries\n", __func__,
 497                        length, num_sg);
 498         result =
 499             rts51x_sg_init(&chip->usb->current_sg, chip->usb->pusb_dev, pipe, 0,
 500                            sg, num_sg, length, GFP_NOIO);
 501         if (result) {
 502                 RTS51X_DEBUGP("rts51x_sg_init returned %d\n", result);
 503                 TRACE_RET(chip, STATUS_ERROR);
 504         }
 505
 506         /* since the block has been initialized successfully, it's now
 507          * okay to cancel it */
 508         set_bit(FLIDX_SG_ACTIVE, &chip->usb->dflags);
 509
 510         /* did an abort occur during the submission? */
 511         if (test_bit(FLIDX_ABORTING, &chip->usb->dflags)) {
 512
 513                 /* cancel the request, if it hasn't been cancelled already */
 514                 if (test_and_clear_bit(FLIDX_SG_ACTIVE, &chip->usb->dflags)) {
 515                         RTS51X_DEBUGP("-- cancelling sg request\n");
 516                         usb_sg_cancel(&chip->usb->current_sg);
 517                 }
 518         }
 519
 520         /* wait for the completion of the transfer */
 521         result = rts51x_sg_wait(&chip->usb->current_sg, timeout);
 522
 523         clear_bit(FLIDX_SG_ACTIVE, &chip->usb->dflags);
 524
 525         /* result = us->current_sg.status; */
 526         if (act_len)
 527                 *act_len = chip->usb->current_sg.bytes;
 528         return interpret_urb_result(chip, pipe, length, result,
 529                                     chip->usb->current_sg.bytes);
 530 }
 531
 532 static int rts51x_bulk_transfer_buf(struct rts51x_chip *chip,
 533                              unsigned int pipe,
 534                              void *buf, unsigned int length,
 535                              unsigned int *act_len, int timeout)
 536 {
 537         int result;
 538
 539         /* fill and submit the URB */
 540         usb_fill_bulk_urb(chip->usb->current_urb, chip->usb->pusb_dev, pipe,
 541                           buf, length, urb_done_completion, NULL);
 542         result = rts51x_msg_common(chip, chip->usb->current_urb, timeout);
 543
 544         /* store the actual length of the data transferred */
 545         if (act_len)
 546                 *act_len = chip->usb->current_urb->actual_length;
 547         return interpret_urb_result(chip, pipe, length, result,
 548                                     chip->usb->current_urb->actual_length);
 549 }
 550
 551 int rts51x_transfer_data(struct rts51x_chip *chip, unsigned int pipe,
 552                          void *buf, unsigned int len, int use_sg,
 553                          unsigned int *act_len, int timeout)
 554 {
 555         int result;
 556
 557         if (timeout < 600)
 558                 timeout = 600;
 559
 560         if (use_sg) {
 561                 result =
 562                     rts51x_bulk_transfer_sglist(chip, pipe,
 563                                                 (struct scatterlist *)buf,
 564                                                 use_sg, len, act_len, timeout);
 565         } else {
 566                 result =
 567                     rts51x_bulk_transfer_buf(chip, pipe, buf, len, act_len,
 568                                              timeout);
 569         }
 570
 571         return result;
 572 }
 573
 574 int rts51x_transfer_data_partial(struct rts51x_chip *chip, unsigned int pipe,
 575                                  void *buf, void **ptr, unsigned int *offset,
 576                                  unsigned int len, int use_sg,
 577                                  unsigned int *act_len, int timeout)
 578 {
 579         int result;
 580
 581         if (timeout < 600)
 582                 timeout = 600;
 583
 584         if (use_sg) {
 585                 void *tmp_buf = kmalloc(len, GFP_KERNEL);
 586                 if (!tmp_buf)
 587                         TRACE_RET(chip, STATUS_NOMEM);
 588
 589                 if (usb_pipeout(pipe)) {
 590                         rts51x_access_sglist(tmp_buf, len, buf, ptr, offset,
 591                                              FROM_XFER_BUF);
 592                 }
 593                 result =
 594                     rts51x_bulk_transfer_buf(chip, pipe, tmp_buf, len, act_len,
 595                                              timeout);
 596                 if (result == STATUS_SUCCESS) {
 597                         if (usb_pipein(pipe)) {
 598                                 rts51x_access_sglist(tmp_buf, len, buf, ptr,
 599                                                      offset, TO_XFER_BUF);
 600                         }
 601                 }
 602
 603                 kfree(tmp_buf);
 604         } else {
 605                 unsigned int step = 0;
 606                 if (offset)
 607                         step = *offset;
 608                 result =
 609                     rts51x_bulk_transfer_buf(chip, pipe, buf + step, len,
 610                                              act_len, timeout);
 611                 if (act_len)
 612                         step += *act_len;
 613                 else
 614                         step += len;
 615                 if (offset)
 616                         *offset = step;
 617         }
 618
 619         return result;
 620 }
 621
 622 int rts51x_get_epc_status(struct rts51x_chip *chip, u16 *status)
 623 {
 624         unsigned int pipe = RCV_INTR_PIPE(chip);
 625         struct usb_host_endpoint *ep;
 626         struct completion urb_done;
 627         int result;
 628
 629         if (!status)
 630                 TRACE_RET(chip, STATUS_ERROR);
 631
 632         /* set up data structures for the wakeup system */
 633         init_completion(&urb_done);
 634
 635         ep = chip->usb->pusb_dev->ep_in[usb_pipeendpoint(pipe)];
 636
 637         /* fill and submit the URB */
 638         /* We set interval to 1 here, so the polling interval is controlled
 639          * by our polling thread */
 640         usb_fill_int_urb(chip->usb->intr_urb, chip->usb->pusb_dev, pipe,
 641                          status, 2, urb_done_completion, &urb_done, 1);
 642
 643         result = rts51x_msg_common(chip, chip->usb->intr_urb, 50);
 644
 645         return interpret_urb_result(chip, pipe, 2, result,
 646                                     chip->usb->intr_urb->actual_length);
 647 }
 648
 649 u8 media_not_present[] = {
 650         0x70, 0, 0x02, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0x3A, 0, 0, 0, 0, 0 };
 651 u8 invalid_cmd_field[] = {
 652         0x70, 0, 0x05, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0x24, 0, 0, 0, 0, 0 };
 653
 654 void rts51x_invoke_transport(struct scsi_cmnd *srb, struct rts51x_chip *chip)
 655 {
 656         int result;
 657
 658 #ifdef CONFIG_PM
 659         if (chip->option.ss_en) {
 660                 if (srb->cmnd[0] == TEST_UNIT_READY) {
 661                         if (RTS51X_CHK_STAT(chip, STAT_SS)) {
 662                                 if (check_fake_card_ready(chip,
 663                                                         SCSI_LUN(srb))) {
 664                                         srb->result = SAM_STAT_GOOD;
 665                                 } else {
 666                                         srb->result = SAM_STAT_CHECK_CONDITION;
 667                                         memcpy(srb->sense_buffer,
 668                                                media_not_present, SENSE_SIZE);
 669                                 }
 670                                 return;
 671                         }
 672                 } else if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
 673                         if (RTS51X_CHK_STAT(chip, STAT_SS)) {
 674                                 int prevent = srb->cmnd[4] & 0x1;
 675
 676                                 if (prevent) {
 677                                         srb->result = SAM_STAT_CHECK_CONDITION;
 678                                         memcpy(srb->sense_buffer,
 679                                                invalid_cmd_field, SENSE_SIZE);
 680                                 } else {
 681                                         srb->result = SAM_STAT_GOOD;
 682                                 }
 683                                 return;
 684                         }
 685                 } else {
 686                         if (RTS51X_CHK_STAT(chip, STAT_SS)
 687                             || RTS51X_CHK_STAT(chip, STAT_SS_PRE)) {
 688                                 /* Wake up device */
 689                                 RTS51X_DEBUGP("Try to wake up device\n");
 690                                 chip->resume_from_scsi = 1;
 691
 692                                 rts51x_try_to_exit_ss(chip);
 693
 694                                 if (RTS51X_CHK_STAT(chip, STAT_SS)) {
 695                                         wait_timeout(3000);
 696
 697                                         rts51x_init_chip(chip);
 698                                         rts51x_init_cards(chip);
 699                                 }
 700                         }
 701                 }
 702         }
 703 #endif
 704
 705         result = rts51x_scsi_handler(srb, chip);
 706
 707         /* if there is a transport error, reset and don't auto-sense */
 708         if (result == TRANSPORT_ERROR) {
 709                 RTS51X_DEBUGP("-- transport indicates error, resetting\n");
 710                 srb->result = DID_ERROR << 16;
 711                 goto Handle_Errors;
 712         }
 713
 714         srb->result = SAM_STAT_GOOD;
 715
 716         /*
 717          * If we have a failure, we're going to do a REQUEST_SENSE
 718          * automatically.  Note that we differentiate between a command
 719          * "failure" and an "error" in the transport mechanism.
 720          */
 721         if (result == TRANSPORT_FAILED) {
 722                 /* set the result so the higher layers expect this data */
 723                 srb->result = SAM_STAT_CHECK_CONDITION;
 724                 memcpy(srb->sense_buffer,
 725                        (unsigned char *)&(chip->sense_buffer[SCSI_LUN(srb)]),
 726                        sizeof(struct sense_data_t));
 727         }
 728
 729         return;
 730
 731         /* Error and abort processing: try to resynchronize with the device
 732          * by issuing a port reset.  If that fails, try a class-specific
 733          * device reset. */
 734 Handle_Errors:
 735         return;
 736 }