git.oblomov.eu Git - linux-2.6/blob - drivers/usb/storage/usb.c

   1 /* Driver for USB Mass Storage compliant devices
   2  *
   3  * $Id: usb.c,v 1.75 2002/04/22 03:39:43 mdharm Exp $
   4  *
   5  * Current development and maintenance by:
   6  *   (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
   7  *
   8  * Developed with the assistance of:
   9  *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
  10  *   (c) 2003 Alan Stern (stern@rowland.harvard.edu)
  11  *
  12  * Initial work by:
  13  *   (c) 1999 Michael Gee (michael@linuxspecific.com)
  14  *
  15  * usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
  16  *   (c) 2000 Yggdrasil Computing, Inc.
  17  *
  18  * This driver is based on the 'USB Mass Storage Class' document. This
  19  * describes in detail the protocol used to communicate with such
  20  * devices.  Clearly, the designers had SCSI and ATAPI commands in
  21  * mind when they created this document.  The commands are all very
  22  * similar to commands in the SCSI-II and ATAPI specifications.
  23  *
  24  * It is important to note that in a number of cases this class
  25  * exhibits class-specific exemptions from the USB specification.
  26  * Notably the usage of NAK, STALL and ACK differs from the norm, in
  27  * that they are used to communicate wait, failed and OK on commands.
  28  *
  29  * Also, for certain devices, the interrupt endpoint is used to convey
  30  * status of a command.
  31  *
  32  * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
  33  * information about this driver.
  34  *
  35  * This program is free software; you can redistribute it and/or modify it
  36  * under the terms of the GNU General Public License as published by the
  37  * Free Software Foundation; either version 2, or (at your option) any
  38  * later version.
  39  *
  40  * This program is distributed in the hope that it will be useful, but
  41  * WITHOUT ANY WARRANTY; without even the implied warranty of
  42  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  43  * General Public License for more details.
  44  *
  45  * You should have received a copy of the GNU General Public License along
  46  * with this program; if not, write to the Free Software Foundation, Inc.,
  47  * 675 Mass Ave, Cambridge, MA 02139, USA.
  48  */
  49
  50 #include <linux/sched.h>
  51 #include <linux/errno.h>
  52 #include <linux/suspend.h>
  53 #include <linux/module.h>
  54 #include <linux/init.h>
  55 #include <linux/slab.h>
  56 #include <linux/kthread.h>
  57 #include <linux/mutex.h>
  58 #include <linux/utsrelease.h>
  59
  60 #include <scsi/scsi.h>
  61 #include <scsi/scsi_cmnd.h>
  62 #include <scsi/scsi_device.h>
  63
  64 #include "usb.h"
  65 #include "scsiglue.h"
  66 #include "transport.h"
  67 #include "protocol.h"
  68 #include "debug.h"
  69 #include "initializers.h"
  70
  71 #ifdef CONFIG_USB_STORAGE_USBAT
  72 #include "shuttle_usbat.h"
  73 #endif
  74 #ifdef CONFIG_USB_STORAGE_SDDR09
  75 #include "sddr09.h"
  76 #endif
  77 #ifdef CONFIG_USB_STORAGE_SDDR55
  78 #include "sddr55.h"
  79 #endif
  80 #ifdef CONFIG_USB_STORAGE_DPCM
  81 #include "dpcm.h"
  82 #endif
  83 #ifdef CONFIG_USB_STORAGE_FREECOM
  84 #include "freecom.h"
  85 #endif
  86 #ifdef CONFIG_USB_STORAGE_ISD200
  87 #include "isd200.h"
  88 #endif
  89 #ifdef CONFIG_USB_STORAGE_DATAFAB
  90 #include "datafab.h"
  91 #endif
  92 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
  93 #include "jumpshot.h"
  94 #endif
  95 #ifdef CONFIG_USB_STORAGE_ONETOUCH
  96 #include "onetouch.h"
  97 #endif
  98 #ifdef CONFIG_USB_STORAGE_ALAUDA
  99 #include "alauda.h"
 100 #endif
 101
 102 /* Some informational data */
 103 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
 104 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
 105 MODULE_LICENSE("GPL");
 106
 107 static unsigned int delay_use = 5;
 108 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
 109 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
 110
 111
 112 /* These are used to make sure the module doesn't unload before all the
 113  * threads have exited.
 114  */
 115 static atomic_t total_threads = ATOMIC_INIT(0);
 116 static DECLARE_COMPLETION(threads_gone);
 117
 118
 119 /*
 120  * The entries in this table correspond, line for line,
 121  * with the entries of us_unusual_dev_list[].
 122  */
 123 #ifndef CONFIG_USB_LIBUSUAL
 124
 125 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 126                     vendorName, productName,useProtocol, useTransport, \
 127                     initFunction, flags) \
 128 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin,bcdDeviceMax), \
 129   .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }
 130
 131 #define USUAL_DEV(useProto, useTrans, useType) \
 132 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, useProto, useTrans), \
 133   .driver_info = (USB_US_TYPE_STOR<<24) }
 134
 135 static struct usb_device_id storage_usb_ids [] = {
 136
 137 #       include "unusual_devs.h"
 138 #undef UNUSUAL_DEV
 139 #undef USUAL_DEV
 140         /* Terminating entry */
 141         { }
 142 };
 143
 144 MODULE_DEVICE_TABLE (usb, storage_usb_ids);
 145 #endif /* CONFIG_USB_LIBUSUAL */
 146
 147 /* This is the list of devices we recognize, along with their flag data */
 148
 149 /* The vendor name should be kept at eight characters or less, and
 150  * the product name should be kept at 16 characters or less. If a device
 151  * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
 152  * normally generated by a device thorugh the INQUIRY response will be
 153  * taken from this list, and this is the reason for the above size
 154  * restriction. However, if the flag is not present, then you
 155  * are free to use as many characters as you like.
 156  */
 157
 158 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
 159                     vendor_name, product_name, use_protocol, use_transport, \
 160                     init_function, Flags) \
 161 { \
 162         .vendorName = vendor_name,      \
 163         .productName = product_name,    \
 164         .useProtocol = use_protocol,    \
 165         .useTransport = use_transport,  \
 166         .initFunction = init_function,  \
 167 }
 168
 169 #define USUAL_DEV(use_protocol, use_transport, use_type) \
 170 { \
 171         .useProtocol = use_protocol,    \
 172         .useTransport = use_transport,  \
 173 }
 174
 175 static struct us_unusual_dev us_unusual_dev_list[] = {
 176 #       include "unusual_devs.h"
 177 #       undef UNUSUAL_DEV
 178 #       undef USUAL_DEV
 179
 180         /* Terminating entry */
 181         { NULL }
 182 };
 183
 184
 185 #ifdef CONFIG_PM        /* Minimal support for suspend and resume */
 186
 187 static int storage_suspend(struct usb_interface *iface, pm_message_t message)
 188 {
 189         struct us_data *us = usb_get_intfdata(iface);
 190
 191         /* Wait until no command is running */
 192         mutex_lock(&us->dev_mutex);
 193
 194         US_DEBUGP("%s\n", __FUNCTION__);
 195         if (us->suspend_resume_hook)
 196                 (us->suspend_resume_hook)(us, US_SUSPEND);
 197         iface->dev.power.power_state.event = message.event;
 198
 199         /* When runtime PM is working, we'll set a flag to indicate
 200          * whether we should autoresume when a SCSI request arrives. */
 201
 202         mutex_unlock(&us->dev_mutex);
 203         return 0;
 204 }
 205
 206 static int storage_resume(struct usb_interface *iface)
 207 {
 208         struct us_data *us = usb_get_intfdata(iface);
 209
 210         mutex_lock(&us->dev_mutex);
 211
 212         US_DEBUGP("%s\n", __FUNCTION__);
 213         if (us->suspend_resume_hook)
 214                 (us->suspend_resume_hook)(us, US_RESUME);
 215         iface->dev.power.power_state.event = PM_EVENT_ON;
 216
 217         mutex_unlock(&us->dev_mutex);
 218         return 0;
 219 }
 220
 221 #endif /* CONFIG_PM */
 222
 223 /*
 224  * The next two routines get called just before and just after
 225  * a USB port reset, whether from this driver or a different one.
 226  */
 227
 228 static void storage_pre_reset(struct usb_interface *iface)
 229 {
 230         struct us_data *us = usb_get_intfdata(iface);
 231
 232         US_DEBUGP("%s\n", __FUNCTION__);
 233
 234         /* Make sure no command runs during the reset */
 235         mutex_lock(&us->dev_mutex);
 236 }
 237
 238 static void storage_post_reset(struct usb_interface *iface)
 239 {
 240         struct us_data *us = usb_get_intfdata(iface);
 241
 242         US_DEBUGP("%s\n", __FUNCTION__);
 243
 244         /* Report the reset to the SCSI core */
 245         scsi_lock(us_to_host(us));
 246         usb_stor_report_bus_reset(us);
 247         scsi_unlock(us_to_host(us));
 248
 249         /* FIXME: Notify the subdrivers that they need to reinitialize
 250          * the device */
 251         mutex_unlock(&us->dev_mutex);
 252 }
 253
 254 /*
 255  * fill_inquiry_response takes an unsigned char array (which must
 256  * be at least 36 characters) and populates the vendor name,
 257  * product name, and revision fields. Then the array is copied
 258  * into the SCSI command's response buffer (oddly enough
 259  * called request_buffer). data_len contains the length of the
 260  * data array, which again must be at least 36.
 261  */
 262
 263 void fill_inquiry_response(struct us_data *us, unsigned char *data,
 264                 unsigned int data_len)
 265 {
 266         if (data_len<36) // You lose.
 267                 return;
 268
 269         if(data[0]&0x20) { /* USB device currently not connected. Return
 270                               peripheral qualifier 001b ("...however, the
 271                               physical device is not currently connected
 272                               to this logical unit") and leave vendor and
 273                               product identification empty. ("If the target
 274                               does store some of the INQUIRY data on the
 275                               device, it may return zeros or ASCII spaces
 276                               (20h) in those fields until the data is
 277                               available from the device."). */
 278                 memset(data+8,0,28);
 279         } else {
 280                 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
 281                 memcpy(data+8, us->unusual_dev->vendorName,
 282                         strlen(us->unusual_dev->vendorName) > 8 ? 8 :
 283                         strlen(us->unusual_dev->vendorName));
 284                 memcpy(data+16, us->unusual_dev->productName,
 285                         strlen(us->unusual_dev->productName) > 16 ? 16 :
 286                         strlen(us->unusual_dev->productName));
 287                 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 288                 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 289                 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
 290                 data[35] = 0x30 + ((bcdDevice) & 0x0F);
 291         }
 292
 293         usb_stor_set_xfer_buf(data, data_len, us->srb);
 294 }
 295
 296 static int usb_stor_control_thread(void * __us)
 297 {
 298         struct us_data *us = (struct us_data *)__us;
 299         struct Scsi_Host *host = us_to_host(us);
 300
 301         current->flags |= PF_NOFREEZE;
 302
 303         for(;;) {
 304                 US_DEBUGP("*** thread sleeping.\n");
 305                 if(down_interruptible(&us->sema))
 306                         break;
 307
 308                 US_DEBUGP("*** thread awakened.\n");
 309
 310                 /* lock the device pointers */
 311                 mutex_lock(&(us->dev_mutex));
 312
 313                 /* if the device has disconnected, we are free to exit */
 314                 if (test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
 315                         US_DEBUGP("-- exiting\n");
 316                         mutex_unlock(&us->dev_mutex);
 317                         break;
 318                 }
 319
 320                 /* lock access to the state */
 321                 scsi_lock(host);
 322
 323                 /* has the command timed out *already* ? */
 324                 if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
 325                         us->srb->result = DID_ABORT << 16;
 326                         goto SkipForAbort;
 327                 }
 328
 329                 scsi_unlock(host);
 330
 331                 /* reject the command if the direction indicator
 332                  * is UNKNOWN
 333                  */
 334                 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 335                         US_DEBUGP("UNKNOWN data direction\n");
 336                         us->srb->result = DID_ERROR << 16;
 337                 }
 338
 339                 /* reject if target != 0 or if LUN is higher than
 340                  * the maximum known LUN
 341                  */
 342                 else if (us->srb->device->id &&
 343                                 !(us->flags & US_FL_SCM_MULT_TARG)) {
 344                         US_DEBUGP("Bad target number (%d:%d)\n",
 345                                   us->srb->device->id, us->srb->device->lun);
 346                         us->srb->result = DID_BAD_TARGET << 16;
 347                 }
 348
 349                 else if (us->srb->device->lun > us->max_lun) {
 350                         US_DEBUGP("Bad LUN (%d:%d)\n",
 351                                   us->srb->device->id, us->srb->device->lun);
 352                         us->srb->result = DID_BAD_TARGET << 16;
 353                 }
 354
 355                 /* Handle those devices which need us to fake
 356                  * their inquiry data */
 357                 else if ((us->srb->cmnd[0] == INQUIRY) &&
 358                             (us->flags & US_FL_FIX_INQUIRY)) {
 359                         unsigned char data_ptr[36] = {
 360                             0x00, 0x80, 0x02, 0x02,
 361                             0x1F, 0x00, 0x00, 0x00};
 362
 363                         US_DEBUGP("Faking INQUIRY command\n");
 364                         fill_inquiry_response(us, data_ptr, 36);
 365                         us->srb->result = SAM_STAT_GOOD;
 366                 }
 367
 368                 /* we've got a command, let's do it! */
 369                 else {
 370                         US_DEBUG(usb_stor_show_command(us->srb));
 371                         us->proto_handler(us->srb, us);
 372                 }
 373
 374                 /* lock access to the state */
 375                 scsi_lock(host);
 376
 377                 /* did the command already complete because of a disconnect? */
 378                 if (!us->srb)
 379                         ;               /* nothing to do */
 380
 381                 /* indicate that the command is done */
 382                 else if (us->srb->result != DID_ABORT << 16) {
 383                         US_DEBUGP("scsi cmd done, result=0x%x\n",
 384                                    us->srb->result);
 385                         us->srb->scsi_done(us->srb);
 386                 } else {
 387 SkipForAbort:
 388                         US_DEBUGP("scsi command aborted\n");
 389                 }
 390
 391                 /* If an abort request was received we need to signal that
 392                  * the abort has finished.  The proper test for this is
 393                  * the TIMED_OUT flag, not srb->result == DID_ABORT, because
 394                  * the timeout might have occurred after the command had
 395                  * already completed with a different result code. */
 396                 if (test_bit(US_FLIDX_TIMED_OUT, &us->flags)) {
 397                         complete(&(us->notify));
 398
 399                         /* Allow USB transfers to resume */
 400                         clear_bit(US_FLIDX_ABORTING, &us->flags);
 401                         clear_bit(US_FLIDX_TIMED_OUT, &us->flags);
 402                 }
 403
 404                 /* finished working on this command */
 405                 us->srb = NULL;
 406                 scsi_unlock(host);
 407
 408                 /* unlock the device pointers */
 409                 mutex_unlock(&us->dev_mutex);
 410         } /* for (;;) */
 411
 412         scsi_host_put(host);
 413
 414         /* notify the exit routine that we're actually exiting now
 415          *
 416          * complete()/wait_for_completion() is similar to up()/down(),
 417          * except that complete() is safe in the case where the structure
 418          * is getting deleted in a parallel mode of execution (i.e. just
 419          * after the down() -- that's necessary for the thread-shutdown
 420          * case.
 421          *
 422          * complete_and_exit() goes even further than this -- it is safe in
 423          * the case that the thread of the caller is going away (not just
 424          * the structure) -- this is necessary for the module-remove case.
 425          * This is important in preemption kernels, which transfer the flow
 426          * of execution immediately upon a complete().
 427          */
 428         complete_and_exit(&threads_gone, 0);
 429 }
 430
 431 /***********************************************************************
 432  * Device probing and disconnecting
 433  ***********************************************************************/
 434
 435 /* Associate our private data with the USB device */
 436 static int associate_dev(struct us_data *us, struct usb_interface *intf)
 437 {
 438         US_DEBUGP("-- %s\n", __FUNCTION__);
 439
 440         /* Fill in the device-related fields */
 441         us->pusb_dev = interface_to_usbdev(intf);
 442         us->pusb_intf = intf;
 443         us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 444         US_DEBUGP("Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
 445                         le16_to_cpu(us->pusb_dev->descriptor.idVendor),
 446                         le16_to_cpu(us->pusb_dev->descriptor.idProduct),
 447                         le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
 448         US_DEBUGP("Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
 449                         intf->cur_altsetting->desc.bInterfaceSubClass,
 450                         intf->cur_altsetting->desc.bInterfaceProtocol);
 451
 452         /* Store our private data in the interface */
 453         usb_set_intfdata(intf, us);
 454
 455         /* Allocate the device-related DMA-mapped buffers */
 456         us->cr = usb_buffer_alloc(us->pusb_dev, sizeof(*us->cr),
 457                         GFP_KERNEL, &us->cr_dma);
 458         if (!us->cr) {
 459                 US_DEBUGP("usb_ctrlrequest allocation failed\n");
 460                 return -ENOMEM;
 461         }
 462
 463         us->iobuf = usb_buffer_alloc(us->pusb_dev, US_IOBUF_SIZE,
 464                         GFP_KERNEL, &us->iobuf_dma);
 465         if (!us->iobuf) {
 466                 US_DEBUGP("I/O buffer allocation failed\n");
 467                 return -ENOMEM;
 468         }
 469
 470         us->sensebuf = kmalloc(US_SENSE_SIZE, GFP_KERNEL);
 471         if (!us->sensebuf) {
 472                 US_DEBUGP("Sense buffer allocation failed\n");
 473                 return -ENOMEM;
 474         }
 475         return 0;
 476 }
 477
 478 /* Find an unusual_dev descriptor (always succeeds in the current code) */
 479 static struct us_unusual_dev *find_unusual(const struct usb_device_id *id)
 480 {
 481         const int id_index = id - storage_usb_ids;
 482         return &us_unusual_dev_list[id_index];
 483 }
 484
 485 /* Get the unusual_devs entries and the string descriptors */
 486 static int get_device_info(struct us_data *us, const struct usb_device_id *id)
 487 {
 488         struct usb_device *dev = us->pusb_dev;
 489         struct usb_interface_descriptor *idesc =
 490                 &us->pusb_intf->cur_altsetting->desc;
 491         struct us_unusual_dev *unusual_dev = find_unusual(id);
 492
 493         /* Store the entries */
 494         us->unusual_dev = unusual_dev;
 495         us->subclass = (unusual_dev->useProtocol == US_SC_DEVICE) ?
 496                         idesc->bInterfaceSubClass :
 497                         unusual_dev->useProtocol;
 498         us->protocol = (unusual_dev->useTransport == US_PR_DEVICE) ?
 499                         idesc->bInterfaceProtocol :
 500                         unusual_dev->useTransport;
 501         us->flags = USB_US_ORIG_FLAGS(id->driver_info);
 502
 503         if (us->flags & US_FL_IGNORE_DEVICE) {
 504                 printk(KERN_INFO USB_STORAGE "device ignored\n");
 505                 return -ENODEV;
 506         }
 507
 508         /*
 509          * This flag is only needed when we're in high-speed, so let's
 510          * disable it if we're in full-speed
 511          */
 512         if (dev->speed != USB_SPEED_HIGH)
 513                 us->flags &= ~US_FL_GO_SLOW;
 514
 515         /* Log a message if a non-generic unusual_dev entry contains an
 516          * unnecessary subclass or protocol override.  This may stimulate
 517          * reports from users that will help us remove unneeded entries
 518          * from the unusual_devs.h table.
 519          */
 520         if (id->idVendor || id->idProduct) {
 521                 static const char *msgs[3] = {
 522                         "an unneeded SubClass entry",
 523                         "an unneeded Protocol entry",
 524                         "unneeded SubClass and Protocol entries"};
 525                 struct usb_device_descriptor *ddesc = &dev->descriptor;
 526                 int msg = -1;
 527
 528                 if (unusual_dev->useProtocol != US_SC_DEVICE &&
 529                         us->subclass == idesc->bInterfaceSubClass)
 530                         msg += 1;
 531                 if (unusual_dev->useTransport != US_PR_DEVICE &&
 532                         us->protocol == idesc->bInterfaceProtocol)
 533                         msg += 2;
 534                 if (msg >= 0 && !(us->flags & US_FL_NEED_OVERRIDE))
 535                         printk(KERN_NOTICE USB_STORAGE "This device "
 536                                 "(%04x,%04x,%04x S %02x P %02x)"
 537                                 " has %s in unusual_devs.h (kernel"
 538                                 " %s)\n"
 539                                 "   Please send a copy of this message to "
 540                                 "<linux-usb-devel@lists.sourceforge.net>\n",
 541                                 le16_to_cpu(ddesc->idVendor),
 542                                 le16_to_cpu(ddesc->idProduct),
 543                                 le16_to_cpu(ddesc->bcdDevice),
 544                                 idesc->bInterfaceSubClass,
 545                                 idesc->bInterfaceProtocol,
 546                                 msgs[msg],
 547                                 UTS_RELEASE);
 548         }
 549
 550         return 0;
 551 }
 552
 553 /* Get the transport settings */
 554 static int get_transport(struct us_data *us)
 555 {
 556         switch (us->protocol) {
 557         case US_PR_CB:
 558                 us->transport_name = "Control/Bulk";
 559                 us->transport = usb_stor_CB_transport;
 560                 us->transport_reset = usb_stor_CB_reset;
 561                 us->max_lun = 7;
 562                 break;
 563
 564         case US_PR_CBI:
 565                 us->transport_name = "Control/Bulk/Interrupt";
 566                 us->transport = usb_stor_CBI_transport;
 567                 us->transport_reset = usb_stor_CB_reset;
 568                 us->max_lun = 7;
 569                 break;
 570
 571         case US_PR_BULK:
 572                 us->transport_name = "Bulk";
 573                 us->transport = usb_stor_Bulk_transport;
 574                 us->transport_reset = usb_stor_Bulk_reset;
 575                 break;
 576
 577 #ifdef CONFIG_USB_STORAGE_USBAT
 578         case US_PR_USBAT:
 579                 us->transport_name = "Shuttle USBAT";
 580                 us->transport = usbat_transport;
 581                 us->transport_reset = usb_stor_CB_reset;
 582                 us->max_lun = 1;
 583                 break;
 584 #endif
 585
 586 #ifdef CONFIG_USB_STORAGE_SDDR09
 587         case US_PR_EUSB_SDDR09:
 588                 us->transport_name = "EUSB/SDDR09";
 589                 us->transport = sddr09_transport;
 590                 us->transport_reset = usb_stor_CB_reset;
 591                 us->max_lun = 0;
 592                 break;
 593 #endif
 594
 595 #ifdef CONFIG_USB_STORAGE_SDDR55
 596         case US_PR_SDDR55:
 597                 us->transport_name = "SDDR55";
 598                 us->transport = sddr55_transport;
 599                 us->transport_reset = sddr55_reset;
 600                 us->max_lun = 0;
 601                 break;
 602 #endif
 603
 604 #ifdef CONFIG_USB_STORAGE_DPCM
 605         case US_PR_DPCM_USB:
 606                 us->transport_name = "Control/Bulk-EUSB/SDDR09";
 607                 us->transport = dpcm_transport;
 608                 us->transport_reset = usb_stor_CB_reset;
 609                 us->max_lun = 1;
 610                 break;
 611 #endif
 612
 613 #ifdef CONFIG_USB_STORAGE_FREECOM
 614         case US_PR_FREECOM:
 615                 us->transport_name = "Freecom";
 616                 us->transport = freecom_transport;
 617                 us->transport_reset = usb_stor_freecom_reset;
 618                 us->max_lun = 0;
 619                 break;
 620 #endif
 621
 622 #ifdef CONFIG_USB_STORAGE_DATAFAB
 623         case US_PR_DATAFAB:
 624                 us->transport_name  = "Datafab Bulk-Only";
 625                 us->transport = datafab_transport;
 626                 us->transport_reset = usb_stor_Bulk_reset;
 627                 us->max_lun = 1;
 628                 break;
 629 #endif
 630
 631 #ifdef CONFIG_USB_STORAGE_JUMPSHOT
 632         case US_PR_JUMPSHOT:
 633                 us->transport_name  = "Lexar Jumpshot Control/Bulk";
 634                 us->transport = jumpshot_transport;
 635                 us->transport_reset = usb_stor_Bulk_reset;
 636                 us->max_lun = 1;
 637                 break;
 638 #endif
 639
 640 #ifdef CONFIG_USB_STORAGE_ALAUDA
 641         case US_PR_ALAUDA:
 642                 us->transport_name  = "Alauda Control/Bulk";
 643                 us->transport = alauda_transport;
 644                 us->transport_reset = usb_stor_Bulk_reset;
 645                 us->max_lun = 1;
 646                 break;
 647 #endif
 648
 649         default:
 650                 return -EIO;
 651         }
 652         US_DEBUGP("Transport: %s\n", us->transport_name);
 653
 654         /* fix for single-lun devices */
 655         if (us->flags & US_FL_SINGLE_LUN)
 656                 us->max_lun = 0;
 657         return 0;
 658 }
 659
 660 /* Get the protocol settings */
 661 static int get_protocol(struct us_data *us)
 662 {
 663         switch (us->subclass) {
 664         case US_SC_RBC:
 665                 us->protocol_name = "Reduced Block Commands (RBC)";
 666                 us->proto_handler = usb_stor_transparent_scsi_command;
 667                 break;
 668
 669         case US_SC_8020:
 670                 us->protocol_name = "8020i";
 671                 us->proto_handler = usb_stor_ATAPI_command;
 672                 us->max_lun = 0;
 673                 break;
 674
 675         case US_SC_QIC:
 676                 us->protocol_name = "QIC-157";
 677                 us->proto_handler = usb_stor_qic157_command;
 678                 us->max_lun = 0;
 679                 break;
 680
 681         case US_SC_8070:
 682                 us->protocol_name = "8070i";
 683                 us->proto_handler = usb_stor_ATAPI_command;
 684                 us->max_lun = 0;
 685                 break;
 686
 687         case US_SC_SCSI:
 688                 us->protocol_name = "Transparent SCSI";
 689                 us->proto_handler = usb_stor_transparent_scsi_command;
 690                 break;
 691
 692         case US_SC_UFI:
 693                 us->protocol_name = "Uniform Floppy Interface (UFI)";
 694                 us->proto_handler = usb_stor_ufi_command;
 695                 break;
 696
 697 #ifdef CONFIG_USB_STORAGE_ISD200
 698         case US_SC_ISD200:
 699                 us->protocol_name = "ISD200 ATA/ATAPI";
 700                 us->proto_handler = isd200_ata_command;
 701                 break;
 702 #endif
 703
 704         default:
 705                 return -EIO;
 706         }
 707         US_DEBUGP("Protocol: %s\n", us->protocol_name);
 708         return 0;
 709 }
 710
 711 /* Get the pipe settings */
 712 static int get_pipes(struct us_data *us)
 713 {
 714         struct usb_host_interface *altsetting =
 715                 us->pusb_intf->cur_altsetting;
 716         int i;
 717         struct usb_endpoint_descriptor *ep;
 718         struct usb_endpoint_descriptor *ep_in = NULL;
 719         struct usb_endpoint_descriptor *ep_out = NULL;
 720         struct usb_endpoint_descriptor *ep_int = NULL;
 721
 722         /*
 723          * Find the endpoints we need.
 724          * We are expecting a minimum of 2 endpoints - in and out (bulk).
 725          * An optional interrupt is OK (necessary for CBI protocol).
 726          * We will ignore any others.
 727          */
 728         for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
 729                 ep = &altsetting->endpoint[i].desc;
 730
 731                 /* Is it a BULK endpoint? */
 732                 if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 733                                 == USB_ENDPOINT_XFER_BULK) {
 734                         /* BULK in or out? */
 735                         if (ep->bEndpointAddress & USB_DIR_IN)
 736                                 ep_in = ep;
 737                         else
 738                                 ep_out = ep;
 739                 }
 740
 741                 /* Is it an interrupt endpoint? */
 742                 else if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 743                                 == USB_ENDPOINT_XFER_INT) {
 744                         ep_int = ep;
 745                 }
 746         }
 747
 748         if (!ep_in || !ep_out || (us->protocol == US_PR_CBI && !ep_int)) {
 749                 US_DEBUGP("Endpoint sanity check failed! Rejecting dev.\n");
 750                 return -EIO;
 751         }
 752
 753         /* Calculate and store the pipe values */
 754         us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
 755         us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
 756         us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
 757                 ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 758         us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
 759                 ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 760         if (ep_int) {
 761                 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
 762                         ep_int->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
 763                 us->ep_bInterval = ep_int->bInterval;
 764         }
 765         return 0;
 766 }
 767
 768 /* Initialize all the dynamic resources we need */
 769 static int usb_stor_acquire_resources(struct us_data *us)
 770 {
 771         int p;
 772         struct task_struct *th;
 773
 774         us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
 775         if (!us->current_urb) {
 776                 US_DEBUGP("URB allocation failed\n");
 777                 return -ENOMEM;
 778         }
 779
 780         /* Just before we start our control thread, initialize
 781          * the device if it needs initialization */
 782         if (us->unusual_dev->initFunction) {
 783                 p = us->unusual_dev->initFunction(us);
 784                 if (p)
 785                         return p;
 786         }
 787
 788         /* Start up our control thread */
 789         th = kthread_create(usb_stor_control_thread, us, "usb-storage");
 790         if (IS_ERR(th)) {
 791                 printk(KERN_WARNING USB_STORAGE
 792                        "Unable to start control thread\n");
 793                 return PTR_ERR(th);
 794         }
 795
 796         /* Take a reference to the host for the control thread and
 797          * count it among all the threads we have launched.  Then
 798          * start it up. */
 799         scsi_host_get(us_to_host(us));
 800         atomic_inc(&total_threads);
 801         wake_up_process(th);
 802
 803         return 0;
 804 }
 805
 806 /* Release all our dynamic resources */
 807 static void usb_stor_release_resources(struct us_data *us)
 808 {
 809         US_DEBUGP("-- %s\n", __FUNCTION__);
 810
 811         /* Tell the control thread to exit.  The SCSI host must
 812          * already have been removed so it won't try to queue
 813          * any more commands.
 814          */
 815         US_DEBUGP("-- sending exit command to thread\n");
 816         set_bit(US_FLIDX_DISCONNECTING, &us->flags);
 817         up(&us->sema);
 818
 819         /* Call the destructor routine, if it exists */
 820         if (us->extra_destructor) {
 821                 US_DEBUGP("-- calling extra_destructor()\n");
 822                 us->extra_destructor(us->extra);
 823         }
 824
 825         /* Free the extra data and the URB */
 826         kfree(us->extra);
 827         usb_free_urb(us->current_urb);
 828 }
 829
 830 /* Dissociate from the USB device */
 831 static void dissociate_dev(struct us_data *us)
 832 {
 833         US_DEBUGP("-- %s\n", __FUNCTION__);
 834
 835         kfree(us->sensebuf);
 836
 837         /* Free the device-related DMA-mapped buffers */
 838         if (us->cr)
 839                 usb_buffer_free(us->pusb_dev, sizeof(*us->cr), us->cr,
 840                                 us->cr_dma);
 841         if (us->iobuf)
 842                 usb_buffer_free(us->pusb_dev, US_IOBUF_SIZE, us->iobuf,
 843                                 us->iobuf_dma);
 844
 845         /* Remove our private data from the interface */
 846         usb_set_intfdata(us->pusb_intf, NULL);
 847 }
 848
 849 /* First stage of disconnect processing: stop all commands and remove
 850  * the host */
 851 static void quiesce_and_remove_host(struct us_data *us)
 852 {
 853         struct Scsi_Host *host = us_to_host(us);
 854
 855         /* Prevent new USB transfers, stop the current command, and
 856          * interrupt a SCSI-scan or device-reset delay */
 857         scsi_lock(host);
 858         set_bit(US_FLIDX_DISCONNECTING, &us->flags);
 859         scsi_unlock(host);
 860         usb_stor_stop_transport(us);
 861         wake_up(&us->delay_wait);
 862
 863         /* It doesn't matter if the SCSI-scanning thread is still running.
 864          * The thread will exit when it sees the DISCONNECTING flag. */
 865
 866         /* queuecommand won't accept any new commands and the control
 867          * thread won't execute a previously-queued command.  If there
 868          * is such a command pending, complete it with an error. */
 869         mutex_lock(&us->dev_mutex);
 870         if (us->srb) {
 871                 us->srb->result = DID_NO_CONNECT << 16;
 872                 scsi_lock(host);
 873                 us->srb->scsi_done(us->srb);
 874                 us->srb = NULL;
 875                 scsi_unlock(host);
 876         }
 877         mutex_unlock(&us->dev_mutex);
 878
 879         /* Now we own no commands so it's safe to remove the SCSI host */
 880         scsi_remove_host(host);
 881 }
 882
 883 /* Second stage of disconnect processing: deallocate all resources */
 884 static void release_everything(struct us_data *us)
 885 {
 886         usb_stor_release_resources(us);
 887         dissociate_dev(us);
 888
 889         /* Drop our reference to the host; the SCSI core will free it
 890          * (and "us" along with it) when the refcount becomes 0. */
 891         scsi_host_put(us_to_host(us));
 892 }
 893
 894 /* Thread to carry out delayed SCSI-device scanning */
 895 static int usb_stor_scan_thread(void * __us)
 896 {
 897         struct us_data *us = (struct us_data *)__us;
 898
 899         printk(KERN_DEBUG
 900                 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
 901
 902         /* Wait for the timeout to expire or for a disconnect */
 903         if (delay_use > 0) {
 904                 printk(KERN_DEBUG "usb-storage: waiting for device "
 905                                 "to settle before scanning\n");
 906 retry:
 907                 wait_event_interruptible_timeout(us->delay_wait,
 908                                 test_bit(US_FLIDX_DISCONNECTING, &us->flags),
 909                                 delay_use * HZ);
 910                 if (try_to_freeze())
 911                         goto retry;
 912         }
 913
 914         /* If the device is still connected, perform the scanning */
 915         if (!test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
 916
 917                 /* For bulk-only devices, determine the max LUN value */
 918                 if (us->protocol == US_PR_BULK &&
 919                                 !(us->flags & US_FL_SINGLE_LUN)) {
 920                         mutex_lock(&us->dev_mutex);
 921                         us->max_lun = usb_stor_Bulk_max_lun(us);
 922                         mutex_unlock(&us->dev_mutex);
 923                 }
 924                 scsi_scan_host(us_to_host(us));
 925                 printk(KERN_DEBUG "usb-storage: device scan complete\n");
 926
 927                 /* Should we unbind if no devices were detected? */
 928         }
 929
 930         scsi_host_put(us_to_host(us));
 931         complete_and_exit(&threads_gone, 0);
 932 }
 933
 934
 935 /* Probe to see if we can drive a newly-connected USB device */
 936 static int storage_probe(struct usb_interface *intf,
 937                          const struct usb_device_id *id)
 938 {
 939         struct Scsi_Host *host;
 940         struct us_data *us;
 941         int result;
 942         struct task_struct *th;
 943
 944         if (usb_usual_check_type(id, USB_US_TYPE_STOR))
 945                 return -ENXIO;
 946
 947         US_DEBUGP("USB Mass Storage device detected\n");
 948
 949         /*
 950          * Ask the SCSI layer to allocate a host structure, with extra
 951          * space at the end for our private us_data structure.
 952          */
 953         host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
 954         if (!host) {
 955                 printk(KERN_WARNING USB_STORAGE
 956                         "Unable to allocate the scsi host\n");
 957                 return -ENOMEM;
 958         }
 959
 960         us = host_to_us(host);
 961         memset(us, 0, sizeof(struct us_data));
 962         mutex_init(&(us->dev_mutex));
 963         init_MUTEX_LOCKED(&(us->sema));
 964         init_completion(&(us->notify));
 965         init_waitqueue_head(&us->delay_wait);
 966
 967         /* Associate the us_data structure with the USB device */
 968         result = associate_dev(us, intf);
 969         if (result)
 970                 goto BadDevice;
 971
 972         /*
 973          * Get the unusual_devs entries and the descriptors
 974          *
 975          * id_index is calculated in the declaration to be the index number
 976          * of the match from the usb_device_id table, so we can find the
 977          * corresponding entry in the private table.
 978          */
 979         result = get_device_info(us, id);
 980         if (result)
 981                 goto BadDevice;
 982
 983         /* Get the transport, protocol, and pipe settings */
 984         result = get_transport(us);
 985         if (result)
 986                 goto BadDevice;
 987         result = get_protocol(us);
 988         if (result)
 989                 goto BadDevice;
 990         result = get_pipes(us);
 991         if (result)
 992                 goto BadDevice;
 993
 994         /* Acquire all the other resources and add the host */
 995         result = usb_stor_acquire_resources(us);
 996         if (result)
 997                 goto BadDevice;
 998         result = scsi_add_host(host, &intf->dev);
 999         if (result) {
1000                 printk(KERN_WARNING USB_STORAGE
1001                         "Unable to add the scsi host\n");
1002                 goto BadDevice;
1003         }
1004
1005         /* Start up the thread for delayed SCSI-device scanning */
1006         th = kthread_create(usb_stor_scan_thread, us, "usb-stor-scan");
1007         if (IS_ERR(th)) {
1008                 printk(KERN_WARNING USB_STORAGE
1009                        "Unable to start the device-scanning thread\n");
1010                 quiesce_and_remove_host(us);
1011                 result = PTR_ERR(th);
1012                 goto BadDevice;
1013         }
1014
1015         /* Take a reference to the host for the scanning thread and
1016          * count it among all the threads we have launched.  Then
1017          * start it up. */
1018         scsi_host_get(us_to_host(us));
1019         atomic_inc(&total_threads);
1020         wake_up_process(th);
1021
1022         return 0;
1023
1024         /* We come here if there are any problems */
1025 BadDevice:
1026         US_DEBUGP("storage_probe() failed\n");
1027         release_everything(us);
1028         return result;
1029 }
1030
1031 /* Handle a disconnect event from the USB core */
1032 static void storage_disconnect(struct usb_interface *intf)
1033 {
1034         struct us_data *us = usb_get_intfdata(intf);
1035
1036         US_DEBUGP("storage_disconnect() called\n");
1037         quiesce_and_remove_host(us);
1038         release_everything(us);
1039 }
1040
1041 /***********************************************************************
1042  * Initialization and registration
1043  ***********************************************************************/
1044
1045 static struct usb_driver usb_storage_driver = {
1046         .name =         "usb-storage",
1047         .probe =        storage_probe,
1048         .disconnect =   storage_disconnect,
1049 #ifdef CONFIG_PM
1050         .suspend =      storage_suspend,
1051         .resume =       storage_resume,
1052 #endif
1053         .pre_reset =    storage_pre_reset,
1054         .post_reset =   storage_post_reset,
1055         .id_table =     storage_usb_ids,
1056 };
1057
1058 static int __init usb_stor_init(void)
1059 {
1060         int retval;
1061         printk(KERN_INFO "Initializing USB Mass Storage driver...\n");
1062
1063         /* register the driver, return usb_register return code if error */
1064         retval = usb_register(&usb_storage_driver);
1065         if (retval == 0) {
1066                 printk(KERN_INFO "USB Mass Storage support registered.\n");
1067                 usb_usual_set_present(USB_US_TYPE_STOR);
1068         }
1069         return retval;
1070 }
1071
1072 static void __exit usb_stor_exit(void)
1073 {
1074         US_DEBUGP("usb_stor_exit() called\n");
1075
1076         /* Deregister the driver
1077          * This will cause disconnect() to be called for each
1078          * attached unit
1079          */
1080         US_DEBUGP("-- calling usb_deregister()\n");
1081         usb_deregister(&usb_storage_driver) ;
1082
1083         /* Don't return until all of our control and scanning threads
1084          * have exited.  Since each thread signals threads_gone as its
1085          * last act, we have to call wait_for_completion the right number
1086          * of times.
1087          */
1088         while (atomic_read(&total_threads) > 0) {
1089                 wait_for_completion(&threads_gone);
1090                 atomic_dec(&total_threads);
1091         }
1092
1093         usb_usual_clear_present(USB_US_TYPE_STOR);
1094 }
1095
1096 module_init(usb_stor_init);
1097 module_exit(usb_stor_exit);