err.no Git - linux-2.6/blob - drivers/usb/storage/usb.c

   1 /* Driver for USB Mass Storage compliant devices
   2  *
   3  * Current development and maintenance by:
   4  *   (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
   5  *
   6  * Developed with the assistance of:
   7  *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
   8  *   (c) 2003 Alan Stern (stern@rowland.harvard.edu)
   9  *
  10  * Initial work by:
  11  *   (c) 1999 Michael Gee (michael@linuxspecific.com)
  12  *
  13  * usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
  14  *   (c) 2000 Yggdrasil Computing, Inc.
  15  *
  16  * This driver is based on the 'USB Mass Storage Class' document. This
  17  * describes in detail the protocol used to communicate with such
  18  * devices.  Clearly, the designers had SCSI and ATAPI commands in
  19  * mind when they created this document.  The commands are all very
  20  * similar to commands in the SCSI-II and ATAPI specifications.
  21  *
  22  * It is important to note that in a number of cases this class
  23  * exhibits class-specific exemptions from the USB specification.
  24  * Notably the usage of NAK, STALL and ACK differs from the norm, in
  25  * that they are used to communicate wait, failed and OK on commands.
  26  *
  27  * Also, for certain devices, the interrupt endpoint is used to convey
  28  * status of a command.
  29  *
  30  * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
  31  * information about this driver.
  32  *
  33  * This program is free software; you can redistribute it and/or modify it
  34  * under the terms of the GNU General Public License as published by the
  35  * Free Software Foundation; either version 2, or (at your option) any
  36  * later version.
  37  *
  38  * This program is distributed in the hope that it will be useful, but
  39  * WITHOUT ANY WARRANTY; without even the implied warranty of
  40  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  41  * General Public License for more details.
  42  *
  43  * You should have received a copy of the GNU General Public License along
  44  * with this program; if not, write to the Free Software Foundation, Inc.,
  45  * 675 Mass Ave, Cambridge, MA 02139, USA.
  46  */
  47
  48 #include <linux/sched.h>
  49 #include <linux/errno.h>
  50 #include <linux/freezer.h>
  51 #include <linux/module.h>
  52 #include <linux/init.h>
  53 #include <linux/slab.h>
  54 #include <linux/kthread.h>
  55 #include <linux/mutex.h>
  56 #include <linux/utsname.h>
  57
  58 #include <scsi/scsi.h>
  59 #include <scsi/scsi_cmnd.h>
  60 #include <scsi/scsi_device.h>
  61
  62 #include "usb.h"
  63 #include "scsiglue.h"
  64 #include "transport.h"
  65 #include "protocol.h"
  66 #include "debug.h"
  67 #include "initializers.h"
  68
  69 #ifdef CONFIG_USB_STORAGE_USBAT
  70 #include "shuttle_usbat.h"
  71 #endif
  72 #ifdef CONFIG_USB_STORAGE_SDDR09
  73 #include "sddr09.h"
  74 #endif
  75 #ifdef CONFIG_USB_STORAGE_SDDR55
  76 #include "sddr55.h"
  77 #endif
  78 #ifdef CONFIG_USB_STORAGE_DPCM
  79 #include "dpcm.h"
  80 #endif
  81 #ifdef CONFIG_USB_STORAGE_FREECOM
  82 #include "freecom.h"
  83 #endif
  84 #ifdef CONFIG_USB_STORAGE_ISD200
  85 #include "isd200.h"
  86 #endif
  87 #ifdef CONFIG_USB_STORAGE_DATAFAB
  88 #include "datafab.h"
  89 #endif
  90 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
  91 #include "jumpshot.h"
  92 #endif
  93 #ifdef CONFIG_USB_STORAGE_ONETOUCH
  94 #include "onetouch.h"
  95 #endif
  96 #ifdef CONFIG_USB_STORAGE_ALAUDA
  97 #include "alauda.h"
  98 #endif
  99 #ifdef CONFIG_USB_STORAGE_KARMA
 100 #include "karma.h"
 101 #endif
 102 #ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB
 103 #include "cypress_atacb.h"
 104 #endif
 105
 106 /* Some informational data */
 107 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
 108 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
 109 MODULE_LICENSE("GPL");
 110
 111 static unsigned int delay_use = 5;
 112 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
 113 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
 114
 115
 116 /*
 117  * The entries in this table correspond, line for line,
 118  * with the entries of us_unusual_dev_list[].
 119  */
 120 #ifndef CONFIG_USB_LIBUSUAL
 121
 122 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 123                     vendorName, productName,useProtocol, useTransport, \
 124                     initFunction, flags) \
 125 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax), \
 126   .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
 127
 128 #define USUAL_DEV(useProto, useTrans, useType) \
 129 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, useProto, useTrans), \
 130   .driver_info = (USB_US_TYPE_STOR<<24) }
 131
 132 static struct usb_device_id storage_usb_ids [] = {
 133
 134 #       include "unusual_devs.h"
 135 #undef UNUSUAL_DEV
 136 #undef USUAL_DEV
 137         /* Terminating entry */
 138         { }
 139 };
 140
 141 MODULE_DEVICE_TABLE (usb, storage_usb_ids);
 142 #endif /* CONFIG_USB_LIBUSUAL */
 143
 144 /* This is the list of devices we recognize, along with their flag data */
 145
 146 /* The vendor name should be kept at eight characters or less, and
 147  * the product name should be kept at 16 characters or less. If a device
 148  * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
 149  * normally generated by a device thorugh the INQUIRY response will be
 150  * taken from this list, and this is the reason for the above size
 151  * restriction. However, if the flag is not present, then you
 152  * are free to use as many characters as you like.
 153  */
 154
 155 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
 156                     vendor_name, product_name, use_protocol, use_transport, \
 157                     init_function, Flags) \
 158 { \
 159         .vendorName = vendor_name,      \
 160         .productName = product_name,    \
 161         .useProtocol = use_protocol,    \
 162         .useTransport = use_transport,  \
 163         .initFunction = init_function,  \
 164 }
 165
 166 #define USUAL_DEV(use_protocol, use_transport, use_type) \
 167 { \
 168         .useProtocol = use_protocol,    \
 169         .useTransport = use_transport,  \
 170 }
 171
 172 static struct us_unusual_dev us_unusual_dev_list[] = {
 173 #       include "unusual_devs.h"
 174 #       undef UNUSUAL_DEV
 175 #       undef USUAL_DEV
 176
 177         /* Terminating entry */
 178         { NULL }
 179 };
 180
 181
 182 #ifdef CONFIG_PM        /* Minimal support for suspend and resume */
 183
 184 static int storage_suspend(struct usb_interface *iface, pm_message_t message)
 185 {
 186         struct us_data *us = usb_get_intfdata(iface);
 187
 188         /* Wait until no command is running */
 189         mutex_lock(&us->dev_mutex);
 190
 191         US_DEBUGP("%s\n", __func__);
 192         if (us->suspend_resume_hook)
 193                 (us->suspend_resume_hook)(us, US_SUSPEND);
 194
 195         /* When runtime PM is working, we'll set a flag to indicate
 196          * whether we should autoresume when a SCSI request arrives. */
 197
 198         mutex_unlock(&us->dev_mutex);
 199         return 0;
 200 }
 201
 202 static int storage_resume(struct usb_interface *iface)
 203 {
 204         struct us_data *us = usb_get_intfdata(iface);
 205
 206         mutex_lock(&us->dev_mutex);
 207
 208         US_DEBUGP("%s\n", __func__);
 209         if (us->suspend_resume_hook)
 210                 (us->suspend_resume_hook)(us, US_RESUME);
 211
 212         mutex_unlock(&us->dev_mutex);
 213         return 0;
 214 }
 215
 216 static int storage_reset_resume(struct usb_interface *iface)
 217 {
 218         struct us_data *us = usb_get_intfdata(iface);
 219
 220         US_DEBUGP("%s\n", __func__);
 221
 222         /* Report the reset to the SCSI core */
 223         usb_stor_report_bus_reset(us);
 224
 225         /* FIXME: Notify the subdrivers that they need to reinitialize
 226          * the device */
 227         return 0;
 228 }
 229
 230 #endif /* CONFIG_PM */
 231
 232 /*
 233  * The next two routines get called just before and just after
 234  * a USB port reset, whether from this driver or a different one.
 235  */
 236
 237 static int storage_pre_reset(struct usb_interface *iface)
 238 {
 239         struct us_data *us = usb_get_intfdata(iface);
 240
 241         US_DEBUGP("%s\n", __func__);
 242
 243         /* Make sure no command runs during the reset */
 244         mutex_lock(&us->dev_mutex);
 245         return 0;
 246 }
 247
 248 static int storage_post_reset(struct usb_interface *iface)
 249 {
 250         struct us_data *us = usb_get_intfdata(iface);
 251
 252         US_DEBUGP("%s\n", __func__);
 253
 254         /* Report the reset to the SCSI core */
 255         usb_stor_report_bus_reset(us);
 256
 257         /* FIXME: Notify the subdrivers that they need to reinitialize
 258          * the device */
 259
 260         mutex_unlock(&us->dev_mutex);
 261         return 0;
 262 }
 263
 264 /*
 265  * fill_inquiry_response takes an unsigned char array (which must
 266  * be at least 36 characters) and populates the vendor name,
 267  * product name, and revision fields. Then the array is copied
 268  * into the SCSI command's response buffer (oddly enough
 269  * called request_buffer). data_len contains the length of the
 270  * data array, which again must be at least 36.
 271  */
 272
 273 void fill_inquiry_response(struct us_data *us, unsigned char *data,
 274                 unsigned int data_len)
 275 {
 276         if (data_len<36) // You lose.
 277                 return;
 278
 279         if(data[0]&0x20) { /* USB device currently not connected. Return
 280                               peripheral qualifier 001b ("...however, the
 281                               physical device is not currently connected
 282                               to this logical unit") and leave vendor and
 283                               product identification empty. ("If the target
 284                               does store some of the INQUIRY data on the
 285                               device, it may return zeros or ASCII spaces
 286                               (20h) in those fields until the data is
 287                               available from the device."). */
 288                 memset(data+8,0,28);
 289         } else {
 290                 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
 291                 memcpy(data+8, us->unusual_dev->vendorName,
 292                         strlen(us->unusual_dev->vendorName) > 8 ? 8 :
 293                         strlen(us->unusual_dev->vendorName));
 294                 memcpy(data+16, us->unusual_dev->productName,
 295                         strlen(us->unusual_dev->productName) > 16 ? 16 :
 296                         strlen(us->unusual_dev->productName));
 297                 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 298                 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 299                 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
 300                 data[35] = 0x30 + ((bcdDevice) & 0x0F);
 301         }
 302
 303         usb_stor_set_xfer_buf(data, data_len, us->srb);
 304 }
 305
 306 static int usb_stor_control_thread(void * __us)
 307 {
 308         struct us_data *us = (struct us_data *)__us;
 309         struct Scsi_Host *host = us_to_host(us);
 310
 311         for(;;) {
 312                 US_DEBUGP("*** thread sleeping.\n");
 313                 if (wait_for_completion_interruptible(&us->cmnd_ready))
 314                         break;
 315
 316                 US_DEBUGP("*** thread awakened.\n");
 317
 318                 /* lock the device pointers */
 319                 mutex_lock(&(us->dev_mutex));
 320
 321                 /* lock access to the state */
 322                 scsi_lock(host);
 323
 324                 /* When we are called with no command pending, we're done */
 325                 if (us->srb == NULL) {
 326                         scsi_unlock(host);
 327                         mutex_unlock(&us->dev_mutex);
 328                         US_DEBUGP("-- exiting\n");
 329                         break;
 330                 }
 331
 332                 /* has the command timed out *already* ? */
 333                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 334                         us->srb->result = DID_ABORT << 16;
 335                         goto SkipForAbort;
 336                 }
 337
 338                 scsi_unlock(host);
 339
 340                 /* reject the command if the direction indicator
 341                  * is UNKNOWN
 342                  */
 343                 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 344                         US_DEBUGP("UNKNOWN data direction\n");
 345                         us->srb->result = DID_ERROR << 16;
 346                 }
 347
 348                 /* reject if target != 0 or if LUN is higher than
 349                  * the maximum known LUN
 350                  */
 351                 else if (us->srb->device->id &&
 352                                 !(us->fflags & US_FL_SCM_MULT_TARG)) {
 353                         US_DEBUGP("Bad target number (%d:%d)\n",
 354                                   us->srb->device->id, us->srb->device->lun);
 355                         us->srb->result = DID_BAD_TARGET << 16;
 356                 }
 357
 358                 else if (us->srb->device->lun > us->max_lun) {
 359                         US_DEBUGP("Bad LUN (%d:%d)\n",
 360                                   us->srb->device->id, us->srb->device->lun);
 361                         us->srb->result = DID_BAD_TARGET << 16;
 362                 }
 363
 364                 /* Handle those devices which need us to fake
 365                  * their inquiry data */
 366                 else if ((us->srb->cmnd[0] == INQUIRY) &&
 367                             (us->fflags & US_FL_FIX_INQUIRY)) {
 368                         unsigned char data_ptr[36] = {
 369                             0x00, 0x80, 0x02, 0x02,
 370                             0x1F, 0x00, 0x00, 0x00};
 371
 372                         US_DEBUGP("Faking INQUIRY command\n");
 373                         fill_inquiry_response(us, data_ptr, 36);
 374                         us->srb->result = SAM_STAT_GOOD;
 375                 }
 376
 377                 /* we've got a command, let's do it! */
 378                 else {
 379                         US_DEBUG(usb_stor_show_command(us->srb));
 380                         us->proto_handler(us->srb, us);
 381                 }
 382
 383                 /* lock access to the state */
 384                 scsi_lock(host);
 385
 386                 /* indicate that the command is done */
 387                 if (us->srb->result != DID_ABORT << 16) {
 388                         US_DEBUGP("scsi cmd done, result=0x%x\n",
 389                                    us->srb->result);
 390                         us->srb->scsi_done(us->srb);
 391                 } else {
 392 SkipForAbort:
 393                         US_DEBUGP("scsi command aborted\n");
 394                 }
 395
 396                 /* If an abort request was received we need to signal that
 397                  * the abort has finished.  The proper test for this is
 398                  * the TIMED_OUT flag, not srb->result == DID_ABORT, because
 399                  * the timeout might have occurred after the command had
 400                  * already completed with a different result code. */
 401                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 402                         complete(&(us->notify));
 403
 404                         /* Allow USB transfers to resume */
 405                         clear_bit(US_FLIDX_ABORTING, &us->dflags);
 406                         clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
 407                 }
 408
 409                 /* finished working on this command */
 410                 us->srb = NULL;
 411                 scsi_unlock(host);
 412
 413                 /* unlock the device pointers */
 414                 mutex_unlock(&us->dev_mutex);
 415         } /* for (;;) */
 416
 417         /* Wait until we are told to stop */
 418         for (;;) {
 419                 set_current_state(TASK_INTERRUPTIBLE);
 420                 if (kthread_should_stop())
 421                         break;
 422                 schedule();
 423         }
 424         __set_current_state(TASK_RUNNING);
 425         return 0;
 426 }
 427
 428 /***********************************************************************
 429  * Device probing and disconnecting
 430  ***********************************************************************/
 431
 432 /* Associate our private data with the USB device */
 433 static int associate_dev(struct us_data *us, struct usb_interface *intf)
 434 {
 435         US_DEBUGP("-- %s\n", __func__);
 436
 437         /* Fill in the device-related fields */
 438         us->pusb_dev = interface_to_usbdev(intf);
 439         us->pusb_intf = intf;
 440         us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 441         US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
 442                         le16_to_cpu(us->pusb_dev->descriptor.idVendor),
 443                         le16_to_cpu(us->pusb_dev->descriptor.idProduct),
 444                         le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
 445         US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
 446                         intf->cur_altsetting->desc.bInterfaceSubClass,
 447                         intf->cur_altsetting->desc.bInterfaceProtocol);
 448
 449         /* Store our private data in the interface */
 450         usb_set_intfdata(intf, us);
 451
 452         /* Allocate the device-related DMA-mapped buffers */
 453         us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
 454                         GFP_KERNEL, &us->cr_dma);
 455         if (!us->cr) {
 456                 US_DEBUGP("usb_ctrlrequest allocation failed\n");
 457                 return -ENOMEM;
 458         }
 459
 460         us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
 461                         GFP_KERNEL, &us->iobuf_dma);
 462         if (!us->iobuf) {
 463                 US_DEBUGP("I/O buffer allocation failed\n");
 464                 return -ENOMEM;
 465         }
 466
 467         us->sensebuf = kmalloc(US_SENSE_SIZE, GFP_KERNEL);
 468         if (!us->sensebuf) {
 469                 US_DEBUGP("Sense buffer allocation failed\n");
 470                 return -ENOMEM;
 471         }
 472         return 0;
 473 }
 474
 475 /* Find an unusual_dev descriptor (always succeeds in the current code) */
 476 static struct us_unusual_dev *find_unusual(const struct usb_device_id *id)
 477 {
 478         const int id_index = id - storage_usb_ids;
 479         return &us_unusual_dev_list[id_index];
 480 }
 481
 482 /* Get the unusual_devs entries and the string descriptors */
 483 static int get_device_info(struct us_data *us, const struct usb_device_id *id)
 484 {
 485         struct usb_device *dev = us->pusb_dev;
 486         struct usb_interface_descriptor *idesc =
 487                 &us->pusb_intf->cur_altsetting->desc;
 488         struct us_unusual_dev *unusual_dev = find_unusual(id);
 489
 490         /* Store the entries */
 491         us->unusual_dev = unusual_dev;
 492         us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
 493                         idesc->bInterfaceSubClass :
 494                         unusual_dev->useProtocol;
 495         us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
 496                         idesc->bInterfaceProtocol :
 497                         unusual_dev->useTransport;
 498         us->fflags = USB_US_ORIG_FLAGS(id->driver_info);
 499
 500         if (us->fflags & US_FL_IGNORE_DEVICE) {
 501                 printk(KERN_INFO USB_STORAGE "device ignored\n");
 502                 return -ENODEV;
 503         }
 504
 505         /*
 506          * This flag is only needed when we're in high-speed, so let's
 507          * disable it if we're in full-speed
 508          */
 509         if (dev->speed != USB_SPEED_HIGH)
 510                 us->fflags &= ~US_FL_GO_SLOW;
 511
 512         /* Log a message if a non-generic unusual_dev entry contains an
 513          * unnecessary subclass or protocol override.  This may stimulate
 514          * reports from users that will help us remove unneeded entries
 515          * from the unusual_devs.h table.
 516          */
 517         if (id->idVendor || id->idProduct) {
 518                 static const char *msgs[3] = {
 519                         "an unneeded SubClass entry",
 520                         "an unneeded Protocol entry",
 521                         "unneeded SubClass and Protocol entries"};
 522                 struct usb_device_descriptor *ddesc = &dev->descriptor;
 523                 int msg = -1;
 524
 525                 if (unusual_dev->useProtocol != US_SC_DEVICE &&
 526                         us->subclass == idesc->bInterfaceSubClass)
 527                         msg += 1;
 528                 if (unusual_dev->useTransport != US_PR_DEVICE &&
 529                         us->protocol == idesc->bInterfaceProtocol)
 530                         msg += 2;
 531                 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
 532                         printk(KERN_NOTICE USB_STORAGE "This device "
 533                                 "(%04x,%04x,%04x S %02x P %02x)"
 534                                 " has %s in unusual_devs.h (kernel"
 535                                 " %s)\n"
 536                                 "   Please send a copy of this message to "
 537                                 "<linux-usb@vger.kernel.org> and "
 538                                 "<usb-storage@lists.one-eyed-alien.net>\n",
 539                                 le16_to_cpu(ddesc->idVendor),
 540                                 le16_to_cpu(ddesc->idProduct),
 541                                 le16_to_cpu(ddesc->bcdDevice),
 542                                 idesc->bInterfaceSubClass,
 543                                 idesc->bInterfaceProtocol,
 544                                 msgs[msg],
 545                                 utsname()->release);
 546         }
 547
 548         return 0;
 549 }
 550
 551 /* Get the transport settings */
 552 static int get_transport(struct us_data *us)
 553 {
 554         switch (us->protocol) {
 555         case US_PR_CB:
 556                 us->transport_name = "Control/Bulk";
 557                 us->transport = usb_stor_CB_transport;
 558                 us->transport_reset = usb_stor_CB_reset;
 559                 us->max_lun = 7;
 560                 break;
 561
 562         case US_PR_CBI:
 563                 us->transport_name = "Control/Bulk/Interrupt";
 564                 us->transport = usb_stor_CBI_transport;
 565                 us->transport_reset = usb_stor_CB_reset;
 566                 us->max_lun = 7;
 567                 break;
 568
 569         case US_PR_BULK:
 570                 us->transport_name = "Bulk";
 571                 us->transport = usb_stor_Bulk_transport;
 572                 us->transport_reset = usb_stor_Bulk_reset;
 573                 break;
 574
 575 #ifdef CONFIG_USB_STORAGE_USBAT
 576         case US_PR_USBAT:
 577                 us->transport_name = "Shuttle USBAT";
 578                 us->transport = usbat_transport;
 579                 us->transport_reset = usb_stor_CB_reset;
 580                 us->max_lun = 1;
 581                 break;
 582 #endif
 583
 584 #ifdef CONFIG_USB_STORAGE_SDDR09
 585         case US_PR_EUSB_SDDR09:
 586                 us->transport_name = "EUSB/SDDR09";
 587                 us->transport = sddr09_transport;
 588                 us->transport_reset = usb_stor_CB_reset;
 589                 us->max_lun = 0;
 590                 break;
 591 #endif
 592
 593 #ifdef CONFIG_USB_STORAGE_SDDR55
 594         case US_PR_SDDR55:
 595                 us->transport_name = "SDDR55";
 596                 us->transport = sddr55_transport;
 597                 us->transport_reset = sddr55_reset;
 598                 us->max_lun = 0;
 599                 break;
 600 #endif
 601
 602 #ifdef CONFIG_USB_STORAGE_DPCM
 603         case US_PR_DPCM_USB:
 604                 us->transport_name = "Control/Bulk-EUSB/SDDR09";
 605                 us->transport = dpcm_transport;
 606                 us->transport_reset = usb_stor_CB_reset;
 607                 us->max_lun = 1;
 608                 break;
 609 #endif
 610
 611 #ifdef CONFIG_USB_STORAGE_FREECOM
 612         case US_PR_FREECOM:
 613                 us->transport_name = "Freecom";
 614                 us->transport = freecom_transport;
 615                 us->transport_reset = usb_stor_freecom_reset;
 616                 us->max_lun = 0;
 617                 break;
 618 #endif
 619
 620 #ifdef CONFIG_USB_STORAGE_DATAFAB
 621         case US_PR_DATAFAB:
 622                 us->transport_name  = "Datafab Bulk-Only";
 623                 us->transport = datafab_transport;
 624                 us->transport_reset = usb_stor_Bulk_reset;
 625                 us->max_lun = 1;
 626                 break;
 627 #endif
 628
 629 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
 630         case US_PR_JUMPSHOT:
 631                 us->transport_name  = "Lexar Jumpshot Control/Bulk";
 632                 us->transport = jumpshot_transport;
 633                 us->transport_reset = usb_stor_Bulk_reset;
 634                 us->max_lun = 1;
 635                 break;
 636 #endif
 637
 638 #ifdef CONFIG_USB_STORAGE_ALAUDA
 639         case US_PR_ALAUDA:
 640                 us->transport_name  = "Alauda Control/Bulk";
 641                 us->transport = alauda_transport;
 642                 us->transport_reset = usb_stor_Bulk_reset;
 643                 us->max_lun = 1;
 644                 break;
 645 #endif
 646
 647 #ifdef CONFIG_USB_STORAGE_KARMA
 648         case US_PR_KARMA:
 649                 us->transport_name = "Rio Karma/Bulk";
 650                 us->transport = rio_karma_transport;
 651                 us->transport_reset = usb_stor_Bulk_reset;
 652                 break;
 653 #endif
 654
 655         default:
 656                 return -EIO;
 657         }
 658         US_DEBUGP("Transport: %s\n", us->transport_name);
 659
 660         /* fix for single-lun devices */
 661         if (us->fflags & US_FL_SINGLE_LUN)
 662                 us->max_lun = 0;
 663         return 0;
 664 }
 665
 666 /* Get the protocol settings */
 667 static int get_protocol(struct us_data *us)
 668 {
 669         switch (us->subclass) {
 670         case US_SC_RBC:
 671                 us->protocol_name = "Reduced Block Commands (RBC)";
 672                 us->proto_handler = usb_stor_transparent_scsi_command;
 673                 break;
 674
 675         case US_SC_8020:
 676                 us->protocol_name = "8020i";
 677                 us->proto_handler = usb_stor_ATAPI_command;
 678                 us->max_lun = 0;
 679                 break;
 680
 681         case US_SC_QIC:
 682                 us->protocol_name = "QIC-157";
 683                 us->proto_handler = usb_stor_qic157_command;
 684                 us->max_lun = 0;
 685                 break;
 686
 687         case US_SC_8070:
 688                 us->protocol_name = "8070i";
 689                 us->proto_handler = usb_stor_ATAPI_command;
 690                 us->max_lun = 0;
 691                 break;
 692
 693         case US_SC_SCSI:
 694                 us->protocol_name = "Transparent SCSI";
 695                 us->proto_handler = usb_stor_transparent_scsi_command;
 696                 break;
 697
 698         case US_SC_UFI:
 699                 us->protocol_name = "Uniform Floppy Interface (UFI)";
 700                 us->proto_handler = usb_stor_ufi_command;
 701                 break;
 702
 703 #ifdef CONFIG_USB_STORAGE_ISD200
 704         case US_SC_ISD200:
 705                 us->protocol_name = "ISD200 ATA/ATAPI";
 706                 us->proto_handler = isd200_ata_command;
 707                 break;
 708 #endif
 709
 710 #ifdef CONFIG_USB_STORAGE_CYPRESS_ATACB
 711         case US_SC_CYP_ATACB:
 712                 us->protocol_name = "Transparent SCSI with Cypress ATACB";
 713                 us->proto_handler = cypress_atacb_passthrough;
 714                 break;
 715 #endif
 716
 717         default:
 718                 return -EIO;
 719         }
 720         US_DEBUGP("Protocol: %s\n", us->protocol_name);
 721         return 0;
 722 }
 723
 724 /* Get the pipe settings */
 725 static int get_pipes(struct us_data *us)
 726 {
 727         struct usb_host_interface *altsetting =
 728                 us->pusb_intf->cur_altsetting;
 729         int i;
 730         struct usb_endpoint_descriptor *ep;
 731         struct usb_endpoint_descriptor *ep_in = NULL;
 732         struct usb_endpoint_descriptor *ep_out = NULL;
 733         struct usb_endpoint_descriptor *ep_int = NULL;
 734
 735         /*
 736          * Find the first endpoint of each type we need.
 737          * We are expecting a minimum of 2 endpoints - in and out (bulk).
 738          * An optional interrupt-in is OK (necessary for CBI protocol).
 739          * We will ignore any others.
 740          */
 741         for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
 742                 ep = &altsetting->endpoint[i].desc;
 743
 744                 if (usb_endpoint_xfer_bulk(ep)) {
 745                         if (usb_endpoint_dir_in(ep)) {
 746                                 if (!ep_in)
 747                                         ep_in = ep;
 748                         } else {
 749                                 if (!ep_out)
 750                                         ep_out = ep;
 751                         }
 752                 }
 753
 754                 else if (usb_endpoint_is_int_in(ep)) {
 755                         if (!ep_int)
 756                                 ep_int = ep;
 757                 }
 758         }
 759
 760         if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) {
 761                 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
 762                 return -EIO;
 763         }
 764
 765         /* Calculate and store the pipe values */
 766         us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
 767         us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
 768         us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
 769                 ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 770         us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
 771                 ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 772         if (ep_int) {
 773                 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
 774                         ep_int->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 775                 us->ep_bInterval = ep_int->bInterval;
 776         }
 777         return 0;
 778 }
 779
 780 /* Initialize all the dynamic resources we need */
 781 static int usb_stor_acquire_resources(struct us_data *us)
 782 {
 783         int p;
 784         struct task_struct *th;
 785
 786         us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
 787         if (!us->current_urb) {
 788                 US_DEBUGP("URB allocation failed\n");
 789                 return -ENOMEM;
 790         }
 791
 792         /* Just before we start our control thread, initialize
 793          * the device if it needs initialization */
 794         if (us->unusual_dev->initFunction) {
 795                 p = us->unusual_dev->initFunction(us);
 796                 if (p)
 797                         return p;
 798         }
 799
 800         /* Start up our control thread */
 801         th = kthread_run(usb_stor_control_thread, us, "usb-storage");
 802         if (IS_ERR(th)) {
 803                 printk(KERN_WARNING USB_STORAGE
 804                        "Unable to start control thread\n");
 805                 return PTR_ERR(th);
 806         }
 807         us->ctl_thread = th;
 808
 809         return 0;
 810 }
 811
 812 /* Release all our dynamic resources */
 813 static void usb_stor_release_resources(struct us_data *us)
 814 {
 815         US_DEBUGP("-- %s\n", __func__);
 816
 817         /* Tell the control thread to exit.  The SCSI host must
 818          * already have been removed and the DISCONNECTING flag set
 819          * so that we won't accept any more commands.
 820          */
 821         US_DEBUGP("-- sending exit command to thread\n");
 822         complete(&us->cmnd_ready);
 823         if (us->ctl_thread)
 824                 kthread_stop(us->ctl_thread);
 825
 826         /* Call the destructor routine, if it exists */
 827         if (us->extra_destructor) {
 828                 US_DEBUGP("-- calling extra_destructor()\n");
 829                 us->extra_destructor(us->extra);
 830         }
 831
 832         /* Free the extra data and the URB */
 833         kfree(us->extra);
 834         usb_free_urb(us->current_urb);
 835 }
 836
 837 /* Dissociate from the USB device */
 838 static void dissociate_dev(struct us_data *us)
 839 {
 840         US_DEBUGP("-- %s\n", __func__);
 841
 842         kfree(us->sensebuf);
 843
 844         /* Free the device-related DMA-mapped buffers */
 845         if (us->cr)
 846                 usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
 847                                 us->cr_dma);
 848         if (us->iobuf)
 849                 usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
 850                                 us->iobuf_dma);
 851
 852         /* Remove our private data from the interface */
 853         usb_set_intfdata(us->pusb_intf, NULL);
 854 }
 855
 856 /* First stage of disconnect processing: stop SCSI scanning,
 857  * remove the host, and stop accepting new commands
 858  */
 859 static void quiesce_and_remove_host(struct us_data *us)
 860 {
 861         struct Scsi_Host *host = us_to_host(us);
 862
 863         /* If the device is really gone, cut short reset delays */
 864         if (us->pusb_dev->state == USB_STATE_NOTATTACHED)
 865                 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 866
 867         /* Prevent SCSI-scanning (if it hasn't started yet)
 868          * and wait for the SCSI-scanning thread to stop.
 869          */
 870         set_bit(US_FLIDX_DONT_SCAN, &us->dflags);
 871         wake_up(&us->delay_wait);
 872         wait_for_completion(&us->scanning_done);
 873
 874         /* Removing the host will perform an orderly shutdown: caches
 875          * synchronized, disks spun down, etc.
 876          */
 877         scsi_remove_host(host);
 878
 879         /* Prevent any new commands from being accepted and cut short
 880          * reset delays.
 881          */
 882         scsi_lock(host);
 883         set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 884         scsi_unlock(host);
 885         wake_up(&us->delay_wait);
 886 }
 887
 888 /* Second stage of disconnect processing: deallocate all resources */
 889 static void release_everything(struct us_data *us)
 890 {
 891         usb_stor_release_resources(us);
 892         dissociate_dev(us);
 893
 894         /* Drop our reference to the host; the SCSI core will free it
 895          * (and "us" along with it) when the refcount becomes 0. */
 896         scsi_host_put(us_to_host(us));
 897 }
 898
 899 /* Thread to carry out delayed SCSI-device scanning */
 900 static int usb_stor_scan_thread(void * __us)
 901 {
 902         struct us_data *us = (struct us_data *)__us;
 903
 904         printk(KERN_DEBUG
 905                 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
 906
 907         set_freezable();
 908         /* Wait for the timeout to expire or for a disconnect */
 909         if (delay_use > 0) {
 910                 printk(KERN_DEBUG "usb-storage: waiting for device "
 911                                 "to settle before scanning\n");
 912                 wait_event_freezable_timeout(us->delay_wait,
 913                                 test_bit(US_FLIDX_DONT_SCAN, &us->dflags),
 914                                 delay_use * HZ);
 915         }
 916
 917         /* If the device is still connected, perform the scanning */
 918         if (!test_bit(US_FLIDX_DONT_SCAN, &us->dflags)) {
 919
 920                 /* For bulk-only devices, determine the max LUN value */
 921                 if (us->protocol == US_PR_BULK &&
 922                                 !(us->fflags & US_FL_SINGLE_LUN)) {
 923                         mutex_lock(&us->dev_mutex);
 924                         us->max_lun = usb_stor_Bulk_max_lun(us);
 925                         mutex_unlock(&us->dev_mutex);
 926                 }
 927                 scsi_scan_host(us_to_host(us));
 928                 printk(KERN_DEBUG "usb-storage: device scan complete\n");
 929
 930                 /* Should we unbind if no devices were detected? */
 931         }
 932
 933         complete_and_exit(&us->scanning_done, 0);
 934 }
 935
 936
 937 /* Probe to see if we can drive a newly-connected USB device */
 938 static int storage_probe(struct usb_interface *intf,
 939                          const struct usb_device_id *id)
 940 {
 941         struct Scsi_Host *host;
 942         struct us_data *us;
 943         int result;
 944         struct task_struct *th;
 945
 946         if (usb_usual_check_type(id, USB_US_TYPE_STOR))
 947                 return -ENXIO;
 948
 949         US_DEBUGP("USB Mass Storage device detected\n");
 950
 951         /*
 952          * Ask the SCSI layer to allocate a host structure, with extra
 953          * space at the end for our private us_data structure.
 954          */
 955         host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
 956         if (!host) {
 957                 printk(KERN_WARNING USB_STORAGE
 958                         "Unable to allocate the scsi host\n");
 959                 return -ENOMEM;
 960         }
 961
 962         /*
 963          * Allow 16-byte CDBs and thus > 2TB
 964          */
 965         host->max_cmd_len = 16;
 966         us = host_to_us(host);
 967         memset(us, 0, sizeof(struct us_data));
 968         mutex_init(&(us->dev_mutex));
 969         init_completion(&us->cmnd_ready);
 970         init_completion(&(us->notify));
 971         init_waitqueue_head(&us->delay_wait);
 972         init_completion(&us->scanning_done);
 973
 974         /* Associate the us_data structure with the USB device */
 975         result = associate_dev(us, intf);
 976         if (result)
 977                 goto BadDevice;
 978
 979         /*
 980          * Get the unusual_devs entries and the descriptors
 981          *
 982          * id_index is calculated in the declaration to be the index number
 983          * of the match from the usb_device_id table, so we can find the
 984          * corresponding entry in the private table.
 985          */
 986         result = get_device_info(us, id);
 987         if (result)
 988                 goto BadDevice;
 989
 990         /* Get the transport, protocol, and pipe settings */
 991         result = get_transport(us);
 992         if (result)
 993                 goto BadDevice;
 994         result = get_protocol(us);
 995         if (result)
 996                 goto BadDevice;
 997         result = get_pipes(us);
 998         if (result)
 999                 goto BadDevice;
1000
1001         /* Acquire all the other resources and add the host */
1002         result = usb_stor_acquire_resources(us);
1003         if (result)
1004                 goto BadDevice;
1005         result = scsi_add_host(host, &intf->dev);
1006         if (result) {
1007                 printk(KERN_WARNING USB_STORAGE
1008                         "Unable to add the scsi host\n");
1009                 goto BadDevice;
1010         }
1011
1012         /* Start up the thread for delayed SCSI-device scanning */
1013         th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
1014         if (IS_ERR(th)) {
1015                 printk(KERN_WARNING USB_STORAGE
1016                        "Unable to start the device-scanning thread\n");
1017                 complete(&us->scanning_done);
1018                 quiesce_and_remove_host(us);
1019                 result = PTR_ERR(th);
1020                 goto BadDevice;
1021         }
1022
1023         wake_up_process(th);
1024
1025         return 0;
1026
1027         /* We come here if there are any problems */
1028 BadDevice:
1029         US_DEBUGP("storage_probe() failed\n");
1030         release_everything(us);
1031         return result;
1032 }
1033
1034 /* Handle a disconnect event from the USB core */
1035 static void storage_disconnect(struct usb_interface *intf)
1036 {
1037         struct us_data *us = usb_get_intfdata(intf);
1038
1039         US_DEBUGP("storage_disconnect() called\n");
1040         quiesce_and_remove_host(us);
1041         release_everything(us);
1042 }
1043
1044 /***********************************************************************
1045  * Initialization and registration
1046  ***********************************************************************/
1047
1048 static struct usb_driver usb_storage_driver = {
1049         .name =         "usb-storage",
1050         .probe =        storage_probe,
1051         .disconnect =   storage_disconnect,
1052 #ifdef CONFIG_PM
1053         .suspend =      storage_suspend,
1054         .resume =       storage_resume,
1055         .reset_resume = storage_reset_resume,
1056 #endif
1057         .pre_reset =    storage_pre_reset,
1058         .post_reset =   storage_post_reset,
1059         .id_table =     storage_usb_ids,
1060         .soft_unbind =  1,
1061 };
1062
1063 static int __init usb_stor_init(void)
1064 {
1065         int retval;
1066         printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
1067
1068         /* register the driver, return usb_register return code if error */
1069         retval = usb_register(&usb_storage_driver);
1070         if (retval == 0) {
1071                 printk(KERN_INFO "USB Mass Storage support registered.\n");
1072                 usb_usual_set_present(USB_US_TYPE_STOR);
1073         }
1074         return retval;
1075 }
1076
1077 static void __exit usb_stor_exit(void)
1078 {
1079         US_DEBUGP("usb_stor_exit() called\n");
1080
1081         /* Deregister the driver
1082          * This will cause disconnect() to be called for each
1083          * attached unit
1084          */
1085         US_DEBUGP("-- calling usb_deregister()\n");
1086         usb_deregister(&usb_storage_driver) ;
1087
1088         usb_usual_clear_present(USB_US_TYPE_STOR);
1089 }
1090
1091 module_init(usb_stor_init);
1092 module_exit(usb_stor_exit);