drivers/usb/storage/usb.c

   1 /*
   2  * Driver for USB Mass Storage compliant devices
   3  *
   4  * Current development and maintenance by:
   5  *   (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
   6  *
   7  * Developed with the assistance of:
   8  *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
   9  *   (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu)
  10  *
  11  * Initial work by:
  12  *   (c) 1999 Michael Gee (michael@linuxspecific.com)
  13  *
  14  * usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
  15  *   (c) 2000 Yggdrasil Computing, Inc.
  16  *
  17  * This driver is based on the 'USB Mass Storage Class' document. This
  18  * describes in detail the protocol used to communicate with such
  19  * devices.  Clearly, the designers had SCSI and ATAPI commands in
  20  * mind when they created this document.  The commands are all very
  21  * similar to commands in the SCSI-II and ATAPI specifications.
  22  *
  23  * It is important to note that in a number of cases this class
  24  * exhibits class-specific exemptions from the USB specification.
  25  * Notably the usage of NAK, STALL and ACK differs from the norm, in
  26  * that they are used to communicate wait, failed and OK on commands.
  27  *
  28  * Also, for certain devices, the interrupt endpoint is used to convey
  29  * status of a command.
  30  *
  31  * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
  32  * information about this driver.
  33  *
  34  * This program is free software; you can redistribute it and/or modify it
  35  * under the terms of the GNU General Public License as published by the
  36  * Free Software Foundation; either version 2, or (at your option) any
  37  * later version.
  38  *
  39  * This program is distributed in the hope that it will be useful, but
  40  * WITHOUT ANY WARRANTY; without even the implied warranty of
  41  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  42  * General Public License for more details.
  43  *
  44  * You should have received a copy of the GNU General Public License along
  45  * with this program; if not, write to the Free Software Foundation, Inc.,
  46  * 675 Mass Ave, Cambridge, MA 02139, USA.
  47  */
  48
  49 #ifdef CONFIG_USB_STORAGE_DEBUG
  50 #define DEBUG
  51 #endif
  52
  53 #include <linux/sched.h>
  54 #include <linux/errno.h>
  55 #include <linux/module.h>
  56 #include <linux/slab.h>
  57 #include <linux/kthread.h>
  58 #include <linux/mutex.h>
  59 #include <linux/utsname.h>
  60
  61 #include <scsi/scsi.h>
  62 #include <scsi/scsi_cmnd.h>
  63 #include <scsi/scsi_device.h>
  64
  65 #include "usb.h"
  66 #include "scsiglue.h"
  67 #include "transport.h"
  68 #include "protocol.h"
  69 #include "debug.h"
  70 #include "initializers.h"
  71
  72 #include "sierra_ms.h"
  73 #include "option_ms.h"
  74
  75 #if IS_ENABLED(CONFIG_USB_UAS)
  76 #include "uas-detect.h"
  77 #endif
  78
  79 #define DRV_NAME "usb-storage"
  80
  81 /* Some informational data */
  82 MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
  83 MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
  84 MODULE_LICENSE("GPL");
  85
  86 static unsigned int delay_use = 1;
  87 module_param(delay_use, uint, S_IRUGO | S_IWUSR);
  88 MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
  89
  90 static char quirks[128];
  91 module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
  92 MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
  93
  94
  95 /*
  96  * The entries in this table correspond, line for line,
  97  * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
  98  */
  99
 100 /*
 101  *The vendor name should be kept at eight characters or less, and
 102  * the product name should be kept at 16 characters or less. If a device
 103  * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
 104  * normally generated by a device through the INQUIRY response will be
 105  * taken from this list, and this is the reason for the above size
 106  * restriction. However, if the flag is not present, then you
 107  * are free to use as many characters as you like.
 108  */
 109
 110 #define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
 111                     vendor_name, product_name, use_protocol, use_transport, \
 112                     init_function, Flags) \
 113 { \
 114         .vendorName = vendor_name,      \
 115         .productName = product_name,    \
 116         .useProtocol = use_protocol,    \
 117         .useTransport = use_transport,  \
 118         .initFunction = init_function,  \
 119 }
 120
 121 #define COMPLIANT_DEV   UNUSUAL_DEV
 122
 123 #define USUAL_DEV(use_protocol, use_transport) \
 124 { \
 125         .useProtocol = use_protocol,    \
 126         .useTransport = use_transport,  \
 127 }
 128
 129 #define UNUSUAL_VENDOR_INTF(idVendor, cl, sc, pr, \
 130                 vendor_name, product_name, use_protocol, use_transport, \
 131                 init_function, Flags) \
 132 { \
 133         .vendorName = vendor_name,      \
 134         .productName = product_name,    \
 135         .useProtocol = use_protocol,    \
 136         .useTransport = use_transport,  \
 137         .initFunction = init_function,  \
 138 }
 139
 140 static struct us_unusual_dev us_unusual_dev_list[] = {
 141 #       include "unusual_devs.h"
 142         { }             /* Terminating entry */
 143 };
 144
 145 static struct us_unusual_dev for_dynamic_ids =
 146                 USUAL_DEV(USB_SC_SCSI, USB_PR_BULK);
 147
 148 #undef UNUSUAL_DEV
 149 #undef COMPLIANT_DEV
 150 #undef USUAL_DEV
 151 #undef UNUSUAL_VENDOR_INTF
 152
 153 #ifdef CONFIG_LOCKDEP
 154
 155 static struct lock_class_key us_interface_key[USB_MAXINTERFACES];
 156
 157 static void us_set_lock_class(struct mutex *mutex,
 158                 struct usb_interface *intf)
 159 {
 160         struct usb_device *udev = interface_to_usbdev(intf);
 161         struct usb_host_config *config = udev->actconfig;
 162         int i;
 163
 164         for (i = 0; i < config->desc.bNumInterfaces; i++) {
 165                 if (config->interface[i] == intf)
 166                         break;
 167         }
 168
 169         BUG_ON(i == config->desc.bNumInterfaces);
 170
 171         lockdep_set_class(mutex, &us_interface_key[i]);
 172 }
 173
 174 #else
 175
 176 static void us_set_lock_class(struct mutex *mutex,
 177                 struct usb_interface *intf)
 178 {
 179 }
 180
 181 #endif
 182
 183 #ifdef CONFIG_PM        /* Minimal support for suspend and resume */
 184
 185 int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
 186 {
 187         struct us_data *us = usb_get_intfdata(iface);
 188
 189         /* Wait until no command is running */
 190         mutex_lock(&us->dev_mutex);
 191
 192         if (us->suspend_resume_hook)
 193                 (us->suspend_resume_hook)(us, US_SUSPEND);
 194
 195         /*
 196          * When runtime PM is working, we'll set a flag to indicate
 197          * whether we should autoresume when a SCSI request arrives.
 198          */
 199
 200         mutex_unlock(&us->dev_mutex);
 201         return 0;
 202 }
 203 EXPORT_SYMBOL_GPL(usb_stor_suspend);
 204
 205 int usb_stor_resume(struct usb_interface *iface)
 206 {
 207         struct us_data *us = usb_get_intfdata(iface);
 208
 209         mutex_lock(&us->dev_mutex);
 210
 211         if (us->suspend_resume_hook)
 212                 (us->suspend_resume_hook)(us, US_RESUME);
 213
 214         mutex_unlock(&us->dev_mutex);
 215         return 0;
 216 }
 217 EXPORT_SYMBOL_GPL(usb_stor_resume);
 218
 219 int usb_stor_reset_resume(struct usb_interface *iface)
 220 {
 221         struct us_data *us = usb_get_intfdata(iface);
 222
 223         /* Report the reset to the SCSI core */
 224         usb_stor_report_bus_reset(us);
 225
 226         /*
 227          * FIXME: Notify the subdrivers that they need to reinitialize
 228          * the device
 229          */
 230         return 0;
 231 }
 232 EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
 233
 234 #endif /* CONFIG_PM */
 235
 236 /*
 237  * The next two routines get called just before and just after
 238  * a USB port reset, whether from this driver or a different one.
 239  */
 240
 241 int usb_stor_pre_reset(struct usb_interface *iface)
 242 {
 243         struct us_data *us = usb_get_intfdata(iface);
 244
 245         /* Make sure no command runs during the reset */
 246         mutex_lock(&us->dev_mutex);
 247         return 0;
 248 }
 249 EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
 250
 251 int usb_stor_post_reset(struct usb_interface *iface)
 252 {
 253         struct us_data *us = usb_get_intfdata(iface);
 254
 255         /* Report the reset to the SCSI core */
 256         usb_stor_report_bus_reset(us);
 257
 258         /*
 259          * FIXME: Notify the subdrivers that they need to reinitialize
 260          * the device
 261          */
 262
 263         mutex_unlock(&us->dev_mutex);
 264         return 0;
 265 }
 266 EXPORT_SYMBOL_GPL(usb_stor_post_reset);
 267
 268 /*
 269  * fill_inquiry_response takes an unsigned char array (which must
 270  * be at least 36 characters) and populates the vendor name,
 271  * product name, and revision fields. Then the array is copied
 272  * into the SCSI command's response buffer (oddly enough
 273  * called request_buffer). data_len contains the length of the
 274  * data array, which again must be at least 36.
 275  */
 276
 277 void fill_inquiry_response(struct us_data *us, unsigned char *data,
 278                 unsigned int data_len)
 279 {
 280         if (data_len < 36) /* You lose. */
 281                 return;
 282
 283         memset(data+8, ' ', 28);
 284         if (data[0]&0x20) { /*
 285                              * USB device currently not connected. Return
 286                              * peripheral qualifier 001b ("...however, the
 287                              * physical device is not currently connected
 288                              * to this logical unit") and leave vendor and
 289                              * product identification empty. ("If the target
 290                              * does store some of the INQUIRY data on the
 291                              * device, it may return zeros or ASCII spaces
 292                              * (20h) in those fields until the data is
 293                              * available from the device.").
 294                              */
 295         } else {
 296                 u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
 297                 int n;
 298
 299                 n = strlen(us->unusual_dev->vendorName);
 300                 memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
 301                 n = strlen(us->unusual_dev->productName);
 302                 memcpy(data+16, us->unusual_dev->productName, min(16, n));
 303
 304                 data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 305                 data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 306                 data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
 307                 data[35] = 0x30 + ((bcdDevice) & 0x0F);
 308         }
 309
 310         usb_stor_set_xfer_buf(data, data_len, us->srb);
 311 }
 312 EXPORT_SYMBOL_GPL(fill_inquiry_response);
 313
 314 static int usb_stor_control_thread(void * __us)
 315 {
 316         struct us_data *us = (struct us_data *)__us;
 317         struct Scsi_Host *host = us_to_host(us);
 318
 319         for (;;) {
 320                 usb_stor_dbg(us, "*** thread sleeping\n");
 321                 if (wait_for_completion_interruptible(&us->cmnd_ready))
 322                         break;
 323
 324                 usb_stor_dbg(us, "*** thread awakened\n");
 325
 326                 /* lock the device pointers */
 327                 mutex_lock(&(us->dev_mutex));
 328
 329                 /* lock access to the state */
 330                 scsi_lock(host);
 331
 332                 /* When we are called with no command pending, we're done */
 333                 if (us->srb == NULL) {
 334                         scsi_unlock(host);
 335                         mutex_unlock(&us->dev_mutex);
 336                         usb_stor_dbg(us, "-- exiting\n");
 337                         break;
 338                 }
 339
 340                 /* has the command timed out *already* ? */
 341                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 342                         us->srb->result = DID_ABORT << 16;
 343                         goto SkipForAbort;
 344                 }
 345
 346                 scsi_unlock(host);
 347
 348                 /*
 349                  * reject the command if the direction indicator
 350                  * is UNKNOWN
 351                  */
 352                 if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 353                         usb_stor_dbg(us, "UNKNOWN data direction\n");
 354                         us->srb->result = DID_ERROR << 16;
 355                 }
 356
 357                 /*
 358                  * reject if target != 0 or if LUN is higher than
 359                  * the maximum known LUN
 360                  */
 361                 else if (us->srb->device->id &&
 362                                 !(us->fflags & US_FL_SCM_MULT_TARG)) {
 363                         usb_stor_dbg(us, "Bad target number (%d:%llu)\n",
 364                                      us->srb->device->id,
 365                                      us->srb->device->lun);
 366                         us->srb->result = DID_BAD_TARGET << 16;
 367                 }
 368
 369                 else if (us->srb->device->lun > us->max_lun) {
 370                         usb_stor_dbg(us, "Bad LUN (%d:%llu)\n",
 371                                      us->srb->device->id,
 372                                      us->srb->device->lun);
 373                         us->srb->result = DID_BAD_TARGET << 16;
 374                 }
 375
 376                 /*
 377                  * Handle those devices which need us to fake
 378                  * their inquiry data
 379                  */
 380                 else if ((us->srb->cmnd[0] == INQUIRY) &&
 381                             (us->fflags & US_FL_FIX_INQUIRY)) {
 382                         unsigned char data_ptr[36] = {
 383                             0x00, 0x80, 0x02, 0x02,
 384                             0x1F, 0x00, 0x00, 0x00};
 385
 386                         usb_stor_dbg(us, "Faking INQUIRY command\n");
 387                         fill_inquiry_response(us, data_ptr, 36);
 388                         us->srb->result = SAM_STAT_GOOD;
 389                 }
 390
 391                 /* we've got a command, let's do it! */
 392                 else {
 393                         US_DEBUG(usb_stor_show_command(us, us->srb));
 394                         us->proto_handler(us->srb, us);
 395                         usb_mark_last_busy(us->pusb_dev);
 396                 }
 397
 398                 /* lock access to the state */
 399                 scsi_lock(host);
 400
 401                 /* indicate that the command is done */
 402                 if (us->srb->result != DID_ABORT << 16) {
 403                         usb_stor_dbg(us, "scsi cmd done, result=0x%x\n",
 404                                      us->srb->result);
 405                         us->srb->scsi_done(us->srb);
 406                 } else {
 407 SkipForAbort:
 408                         usb_stor_dbg(us, "scsi command aborted\n");
 409                 }
 410
 411                 /*
 412                  * If an abort request was received we need to signal that
 413                  * the abort has finished.  The proper test for this is
 414                  * the TIMED_OUT flag, not srb->result == DID_ABORT, because
 415                  * the timeout might have occurred after the command had
 416                  * already completed with a different result code.
 417                  */
 418                 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 419                         complete(&(us->notify));
 420
 421                         /* Allow USB transfers to resume */
 422                         clear_bit(US_FLIDX_ABORTING, &us->dflags);
 423                         clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
 424                 }
 425
 426                 /* finished working on this command */
 427                 us->srb = NULL;
 428                 scsi_unlock(host);
 429
 430                 /* unlock the device pointers */
 431                 mutex_unlock(&us->dev_mutex);
 432         } /* for (;;) */
 433
 434         /* Wait until we are told to stop */
 435         for (;;) {
 436                 set_current_state(TASK_INTERRUPTIBLE);
 437                 if (kthread_should_stop())
 438                         break;
 439                 schedule();
 440         }
 441         __set_current_state(TASK_RUNNING);
 442         return 0;
 443 }
 444
 445 /***********************************************************************
 446  * Device probing and disconnecting
 447  ***********************************************************************/
 448
 449 /* Associate our private data with the USB device */
 450 static int associate_dev(struct us_data *us, struct usb_interface *intf)
 451 {
 452         /* Fill in the device-related fields */
 453         us->pusb_dev = interface_to_usbdev(intf);
 454         us->pusb_intf = intf;
 455         us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 456         usb_stor_dbg(us, "Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
 457                      le16_to_cpu(us->pusb_dev->descriptor.idVendor),
 458                      le16_to_cpu(us->pusb_dev->descriptor.idProduct),
 459                      le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
 460         usb_stor_dbg(us, "Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
 461                      intf->cur_altsetting->desc.bInterfaceSubClass,
 462                      intf->cur_altsetting->desc.bInterfaceProtocol);
 463
 464         /* Store our private data in the interface */
 465         usb_set_intfdata(intf, us);
 466
 467         /* Allocate the control/setup and DMA-mapped buffers */
 468         us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
 469         if (!us->cr)
 470                 return -ENOMEM;
 471
 472         us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE,
 473                         GFP_KERNEL, &us->iobuf_dma);
 474         if (!us->iobuf) {
 475                 usb_stor_dbg(us, "I/O buffer allocation failed\n");
 476                 return -ENOMEM;
 477         }
 478         return 0;
 479 }
 480
 481 /* Works only for digits and letters, but small and fast */
 482 #define TOLOWER(x) ((x) | 0x20)
 483
 484 /* Adjust device flags based on the "quirks=" module parameter */
 485 void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags)
 486 {
 487         char *p;
 488         u16 vid = le16_to_cpu(udev->descriptor.idVendor);
 489         u16 pid = le16_to_cpu(udev->descriptor.idProduct);
 490         unsigned f = 0;
 491         unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE |
 492                         US_FL_FIX_CAPACITY | US_FL_IGNORE_UAS |
 493                         US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
 494                         US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
 495                         US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
 496                         US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
 497                         US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
 498                         US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE |
 499                         US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES |
 500                         US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS |
 501                         US_FL_ALWAYS_SYNC);
 502
 503         p = quirks;
 504         while (*p) {
 505                 /* Each entry consists of VID:PID:flags */
 506                 if (vid == simple_strtoul(p, &p, 16) &&
 507                                 *p == ':' &&
 508                                 pid == simple_strtoul(p+1, &p, 16) &&
 509                                 *p == ':')
 510                         break;
 511
 512                 /* Move forward to the next entry */
 513                 while (*p) {
 514                         if (*p++ == ',')
 515                                 break;
 516                 }
 517         }
 518         if (!*p)        /* No match */
 519                 return;
 520
 521         /* Collect the flags */
 522         while (*++p && *p != ',') {
 523                 switch (TOLOWER(*p)) {
 524                 case 'a':
 525                         f |= US_FL_SANE_SENSE;
 526                         break;
 527                 case 'b':
 528                         f |= US_FL_BAD_SENSE;
 529                         break;
 530                 case 'c':
 531                         f |= US_FL_FIX_CAPACITY;
 532                         break;
 533                 case 'd':
 534                         f |= US_FL_NO_READ_DISC_INFO;
 535                         break;
 536                 case 'e':
 537                         f |= US_FL_NO_READ_CAPACITY_16;
 538                         break;
 539                 case 'f':
 540                         f |= US_FL_NO_REPORT_OPCODES;
 541                         break;
 542                 case 'g':
 543                         f |= US_FL_MAX_SECTORS_240;
 544                         break;
 545                 case 'h':
 546                         f |= US_FL_CAPACITY_HEURISTICS;
 547                         break;
 548                 case 'i':
 549                         f |= US_FL_IGNORE_DEVICE;
 550                         break;
 551                 case 'j':
 552                         f |= US_FL_NO_REPORT_LUNS;
 553                         break;
 554                 case 'l':
 555                         f |= US_FL_NOT_LOCKABLE;
 556                         break;
 557                 case 'm':
 558                         f |= US_FL_MAX_SECTORS_64;
 559                         break;
 560                 case 'n':
 561                         f |= US_FL_INITIAL_READ10;
 562                         break;
 563                 case 'o':
 564                         f |= US_FL_CAPACITY_OK;
 565                         break;
 566                 case 'p':
 567                         f |= US_FL_WRITE_CACHE;
 568                         break;
 569                 case 'r':
 570                         f |= US_FL_IGNORE_RESIDUE;
 571                         break;
 572                 case 's':
 573                         f |= US_FL_SINGLE_LUN;
 574                         break;
 575                 case 't':
 576                         f |= US_FL_NO_ATA_1X;
 577                         break;
 578                 case 'u':
 579                         f |= US_FL_IGNORE_UAS;
 580                         break;
 581                 case 'w':
 582                         f |= US_FL_NO_WP_DETECT;
 583                         break;
 584                 case 'y':
 585                         f |= US_FL_ALWAYS_SYNC;
 586                         break;
 587                 /* Ignore unrecognized flag characters */
 588                 }
 589         }
 590         *fflags = (*fflags & ~mask) | f;
 591 }
 592 EXPORT_SYMBOL_GPL(usb_stor_adjust_quirks);
 593
 594 /* Get the unusual_devs entries and the string descriptors */
 595 static int get_device_info(struct us_data *us, const struct usb_device_id *id,
 596                 struct us_unusual_dev *unusual_dev)
 597 {
 598         struct usb_device *dev = us->pusb_dev;
 599         struct usb_interface_descriptor *idesc =
 600                 &us->pusb_intf->cur_altsetting->desc;
 601         struct device *pdev = &us->pusb_intf->dev;
 602
 603         /* Store the entries */
 604         us->unusual_dev = unusual_dev;
 605         us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ?
 606                         idesc->bInterfaceSubClass :
 607                         unusual_dev->useProtocol;
 608         us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ?
 609                         idesc->bInterfaceProtocol :
 610                         unusual_dev->useTransport;
 611         us->fflags = id->driver_info;
 612         usb_stor_adjust_quirks(us->pusb_dev, &us->fflags);
 613
 614         if (us->fflags & US_FL_IGNORE_DEVICE) {
 615                 dev_info(pdev, "device ignored\n");
 616                 return -ENODEV;
 617         }
 618
 619         /*
 620          * This flag is only needed when we're in high-speed, so let's
 621          * disable it if we're in full-speed
 622          */
 623         if (dev->speed != USB_SPEED_HIGH)
 624                 us->fflags &= ~US_FL_GO_SLOW;
 625
 626         if (us->fflags)
 627                 dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n",
 628                                 le16_to_cpu(dev->descriptor.idVendor),
 629                                 le16_to_cpu(dev->descriptor.idProduct),
 630                                 us->fflags);
 631
 632         /*
 633          * Log a message if a non-generic unusual_dev entry contains an
 634          * unnecessary subclass or protocol override.  This may stimulate
 635          * reports from users that will help us remove unneeded entries
 636          * from the unusual_devs.h table.
 637          */
 638         if (id->idVendor || id->idProduct) {
 639                 static const char *msgs[3] = {
 640                         "an unneeded SubClass entry",
 641                         "an unneeded Protocol entry",
 642                         "unneeded SubClass and Protocol entries"};
 643                 struct usb_device_descriptor *ddesc = &dev->descriptor;
 644                 int msg = -1;
 645
 646                 if (unusual_dev->useProtocol != USB_SC_DEVICE &&
 647                         us->subclass == idesc->bInterfaceSubClass)
 648                         msg += 1;
 649                 if (unusual_dev->useTransport != USB_PR_DEVICE &&
 650                         us->protocol == idesc->bInterfaceProtocol)
 651                         msg += 2;
 652                 if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
 653                         dev_notice(pdev, "This device "
 654                                         "(%04x,%04x,%04x S %02x P %02x)"
 655                                         " has %s in unusual_devs.h (kernel"
 656                                         " %s)\n"
 657                                         "   Please send a copy of this message to "
 658                                         "<linux-usb@vger.kernel.org> and "
 659                                         "<usb-storage@lists.one-eyed-alien.net>\n",
 660                                         le16_to_cpu(ddesc->idVendor),
 661                                         le16_to_cpu(ddesc->idProduct),
 662                                         le16_to_cpu(ddesc->bcdDevice),
 663                                         idesc->bInterfaceSubClass,
 664                                         idesc->bInterfaceProtocol,
 665                                         msgs[msg],
 666                                         utsname()->release);
 667         }
 668
 669         return 0;
 670 }
 671
 672 /* Get the transport settings */
 673 static void get_transport(struct us_data *us)
 674 {
 675         switch (us->protocol) {
 676         case USB_PR_CB:
 677                 us->transport_name = "Control/Bulk";
 678                 us->transport = usb_stor_CB_transport;
 679                 us->transport_reset = usb_stor_CB_reset;
 680                 us->max_lun = 7;
 681                 break;
 682
 683         case USB_PR_CBI:
 684                 us->transport_name = "Control/Bulk/Interrupt";
 685                 us->transport = usb_stor_CB_transport;
 686                 us->transport_reset = usb_stor_CB_reset;
 687                 us->max_lun = 7;
 688                 break;
 689
 690         case USB_PR_BULK:
 691                 us->transport_name = "Bulk";
 692                 us->transport = usb_stor_Bulk_transport;
 693                 us->transport_reset = usb_stor_Bulk_reset;
 694                 break;
 695         }
 696 }
 697
 698 /* Get the protocol settings */
 699 static void get_protocol(struct us_data *us)
 700 {
 701         switch (us->subclass) {
 702         case USB_SC_RBC:
 703                 us->protocol_name = "Reduced Block Commands (RBC)";
 704                 us->proto_handler = usb_stor_transparent_scsi_command;
 705                 break;
 706
 707         case USB_SC_8020:
 708                 us->protocol_name = "8020i";
 709                 us->proto_handler = usb_stor_pad12_command;
 710                 us->max_lun = 0;
 711                 break;
 712
 713         case USB_SC_QIC:
 714                 us->protocol_name = "QIC-157";
 715                 us->proto_handler = usb_stor_pad12_command;
 716                 us->max_lun = 0;
 717                 break;
 718
 719         case USB_SC_8070:
 720                 us->protocol_name = "8070i";
 721                 us->proto_handler = usb_stor_pad12_command;
 722                 us->max_lun = 0;
 723                 break;
 724
 725         case USB_SC_SCSI:
 726                 us->protocol_name = "Transparent SCSI";
 727                 us->proto_handler = usb_stor_transparent_scsi_command;
 728                 break;
 729
 730         case USB_SC_UFI:
 731                 us->protocol_name = "Uniform Floppy Interface (UFI)";
 732                 us->proto_handler = usb_stor_ufi_command;
 733                 break;
 734         }
 735 }
 736
 737 /* Get the pipe settings */
 738 static int get_pipes(struct us_data *us)
 739 {
 740         struct usb_host_interface *alt = us->pusb_intf->cur_altsetting;
 741         struct usb_endpoint_descriptor *ep_in;
 742         struct usb_endpoint_descriptor *ep_out;
 743         struct usb_endpoint_descriptor *ep_int;
 744         int res;
 745
 746         /*
 747          * Find the first endpoint of each type we need.
 748          * We are expecting a minimum of 2 endpoints - in and out (bulk).
 749          * An optional interrupt-in is OK (necessary for CBI protocol).
 750          * We will ignore any others.
 751          */
 752         res = usb_find_common_endpoints(alt, &ep_in, &ep_out, NULL, NULL);
 753         if (res) {
 754                 usb_stor_dbg(us, "bulk endpoints not found\n");
 755                 return res;
 756         }
 757
 758         res = usb_find_int_in_endpoint(alt, &ep_int);
 759         if (res && us->protocol == USB_PR_CBI) {
 760                 usb_stor_dbg(us, "interrupt endpoint not found\n");
 761                 return res;
 762         }
 763
 764         /* Calculate and store the pipe values */
 765         us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
 766         us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
 767         us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
 768                 usb_endpoint_num(ep_out));
 769         us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
 770                 usb_endpoint_num(ep_in));
 771         if (ep_int) {
 772                 us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
 773                         usb_endpoint_num(ep_int));
 774                 us->ep_bInterval = ep_int->bInterval;
 775         }
 776         return 0;
 777 }
 778
 779 /* Initialize all the dynamic resources we need */
 780 static int usb_stor_acquire_resources(struct us_data *us)
 781 {
 782         int p;
 783         struct task_struct *th;
 784
 785         us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
 786         if (!us->current_urb)
 787                 return -ENOMEM;
 788
 789         /*
 790          * Just before we start our control thread, initialize
 791          * the device if it needs initialization
 792          */
 793         if (us->unusual_dev->initFunction) {
 794                 p = us->unusual_dev->initFunction(us);
 795                 if (p)
 796                         return p;
 797         }
 798
 799         /* Start up our control thread */
 800         th = kthread_run(usb_stor_control_thread, us, "usb-storage");
 801         if (IS_ERR(th)) {
 802                 dev_warn(&us->pusb_intf->dev,
 803                                 "Unable to start control thread\n");
 804                 return PTR_ERR(th);
 805         }
 806         us->ctl_thread = th;
 807
 808         return 0;
 809 }
 810
 811 /* Release all our dynamic resources */
 812 static void usb_stor_release_resources(struct us_data *us)
 813 {
 814         /*
 815          * Tell the control thread to exit.  The SCSI host must
 816          * already have been removed and the DISCONNECTING flag set
 817          * so that we won't accept any more commands.
 818          */
 819         usb_stor_dbg(us, "-- sending exit command to thread\n");
 820         complete(&us->cmnd_ready);
 821         if (us->ctl_thread)
 822                 kthread_stop(us->ctl_thread);
 823
 824         /* Call the destructor routine, if it exists */
 825         if (us->extra_destructor) {
 826                 usb_stor_dbg(us, "-- calling extra_destructor()\n");
 827                 us->extra_destructor(us->extra);
 828         }
 829
 830         /* Free the extra data and the URB */
 831         kfree(us->extra);
 832         usb_free_urb(us->current_urb);
 833 }
 834
 835 /* Dissociate from the USB device */
 836 static void dissociate_dev(struct us_data *us)
 837 {
 838         /* Free the buffers */
 839         kfree(us->cr);
 840         usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
 841
 842         /* Remove our private data from the interface */
 843         usb_set_intfdata(us->pusb_intf, NULL);
 844 }
 845
 846 /*
 847  * First stage of disconnect processing: stop SCSI scanning,
 848  * remove the host, and stop accepting new commands
 849  */
 850 static void quiesce_and_remove_host(struct us_data *us)
 851 {
 852         struct Scsi_Host *host = us_to_host(us);
 853
 854         /* If the device is really gone, cut short reset delays */
 855         if (us->pusb_dev->state == USB_STATE_NOTATTACHED) {
 856                 set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 857                 wake_up(&us->delay_wait);
 858         }
 859
 860         /*
 861          * Prevent SCSI scanning (if it hasn't started yet)
 862          * or wait for the SCSI-scanning routine to stop.
 863          */
 864         cancel_delayed_work_sync(&us->scan_dwork);
 865
 866         /* Balance autopm calls if scanning was cancelled */
 867         if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags))
 868                 usb_autopm_put_interface_no_suspend(us->pusb_intf);
 869
 870         /*
 871          * Removing the host will perform an orderly shutdown: caches
 872          * synchronized, disks spun down, etc.
 873          */
 874         scsi_remove_host(host);
 875
 876         /*
 877          * Prevent any new commands from being accepted and cut short
 878          * reset delays.
 879          */
 880         scsi_lock(host);
 881         set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 882         scsi_unlock(host);
 883         wake_up(&us->delay_wait);
 884 }
 885
 886 /* Second stage of disconnect processing: deallocate all resources */
 887 static void release_everything(struct us_data *us)
 888 {
 889         usb_stor_release_resources(us);
 890         dissociate_dev(us);
 891
 892         /*
 893          * Drop our reference to the host; the SCSI core will free it
 894          * (and "us" along with it) when the refcount becomes 0.
 895          */
 896         scsi_host_put(us_to_host(us));
 897 }
 898
 899 /* Delayed-work routine to carry out SCSI-device scanning */
 900 static void usb_stor_scan_dwork(struct work_struct *work)
 901 {
 902         struct us_data *us = container_of(work, struct us_data,
 903                         scan_dwork.work);
 904         struct device *dev = &us->pusb_intf->dev;
 905
 906         dev_dbg(dev, "starting scan\n");
 907
 908         /* For bulk-only devices, determine the max LUN value */
 909         if (us->protocol == USB_PR_BULK &&
 910             !(us->fflags & US_FL_SINGLE_LUN) &&
 911             !(us->fflags & US_FL_SCM_MULT_TARG)) {
 912                 mutex_lock(&us->dev_mutex);
 913                 us->max_lun = usb_stor_Bulk_max_lun(us);
 914                 /*
 915                  * Allow proper scanning of devices that present more than 8 LUNs
 916                  * While not affecting other devices that may need the previous
 917                  * behavior
 918                  */
 919                 if (us->max_lun >= 8)
 920                         us_to_host(us)->max_lun = us->max_lun+1;
 921                 mutex_unlock(&us->dev_mutex);
 922         }
 923         scsi_scan_host(us_to_host(us));
 924         dev_dbg(dev, "scan complete\n");
 925
 926         /* Should we unbind if no devices were detected? */
 927
 928         usb_autopm_put_interface(us->pusb_intf);
 929         clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
 930 }
 931
 932 static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
 933 {
 934         struct usb_device *usb_dev = interface_to_usbdev(intf);
 935
 936         if (usb_dev->bus->sg_tablesize) {
 937                 return usb_dev->bus->sg_tablesize;
 938         }
 939         return SG_ALL;
 940 }
 941
 942 /* First part of general USB mass-storage probing */
 943 int usb_stor_probe1(struct us_data **pus,
 944                 struct usb_interface *intf,
 945                 const struct usb_device_id *id,
 946                 struct us_unusual_dev *unusual_dev,
 947                 struct scsi_host_template *sht)
 948 {
 949         struct Scsi_Host *host;
 950         struct us_data *us;
 951         int result;
 952
 953         dev_info(&intf->dev, "USB Mass Storage device detected\n");
 954
 955         /*
 956          * Ask the SCSI layer to allocate a host structure, with extra
 957          * space at the end for our private us_data structure.
 958          */
 959         host = scsi_host_alloc(sht, sizeof(*us));
 960         if (!host) {
 961                 dev_warn(&intf->dev, "Unable to allocate the scsi host\n");
 962                 return -ENOMEM;
 963         }
 964
 965         /*
 966          * Allow 16-byte CDBs and thus > 2TB
 967          */
 968         host->max_cmd_len = 16;
 969         host->sg_tablesize = usb_stor_sg_tablesize(intf);
 970         *pus = us = host_to_us(host);
 971         mutex_init(&(us->dev_mutex));
 972         us_set_lock_class(&us->dev_mutex, intf);
 973         init_completion(&us->cmnd_ready);
 974         init_completion(&(us->notify));
 975         init_waitqueue_head(&us->delay_wait);
 976         INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork);
 977
 978         /* Associate the us_data structure with the USB device */
 979         result = associate_dev(us, intf);
 980         if (result)
 981                 goto BadDevice;
 982
 983         /* Get the unusual_devs entries and the descriptors */
 984         result = get_device_info(us, id, unusual_dev);
 985         if (result)
 986                 goto BadDevice;
 987
 988         /* Get standard transport and protocol settings */
 989         get_transport(us);
 990         get_protocol(us);
 991
 992         /*
 993          * Give the caller a chance to fill in specialized transport
 994          * or protocol settings.
 995          */
 996         return 0;
 997
 998 BadDevice:
 999         usb_stor_dbg(us, "storage_probe() failed\n");
1000         release_everything(us);
1001         return result;
1002 }
1003 EXPORT_SYMBOL_GPL(usb_stor_probe1);
1004
1005 /* Second part of general USB mass-storage probing */
1006 int usb_stor_probe2(struct us_data *us)
1007 {
1008         int result;
1009         struct device *dev = &us->pusb_intf->dev;
1010
1011         /* Make sure the transport and protocol have both been set */
1012         if (!us->transport || !us->proto_handler) {
1013                 result = -ENXIO;
1014                 goto BadDevice;
1015         }
1016         usb_stor_dbg(us, "Transport: %s\n", us->transport_name);
1017         usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name);
1018
1019         if (us->fflags & US_FL_SCM_MULT_TARG) {
1020                 /*
1021                  * SCM eUSCSI bridge devices can have different numbers
1022                  * of LUNs on different targets; allow all to be probed.
1023                  */
1024                 us->max_lun = 7;
1025                 /* The eUSCSI itself has ID 7, so avoid scanning that */
1026                 us_to_host(us)->this_id = 7;
1027                 /* max_id is 8 initially, so no need to set it here */
1028         } else {
1029                 /* In the normal case there is only a single target */
1030                 us_to_host(us)->max_id = 1;
1031                 /*
1032                  * Like Windows, we won't store the LUN bits in CDB[1] for
1033                  * SCSI-2 devices using the Bulk-Only transport (even though
1034                  * this violates the SCSI spec).
1035                  */
1036                 if (us->transport == usb_stor_Bulk_transport)
1037                         us_to_host(us)->no_scsi2_lun_in_cdb = 1;
1038         }
1039
1040         /* fix for single-lun devices */
1041         if (us->fflags & US_FL_SINGLE_LUN)
1042                 us->max_lun = 0;
1043
1044         /* Find the endpoints and calculate pipe values */
1045         result = get_pipes(us);
1046         if (result)
1047                 goto BadDevice;
1048
1049         /*
1050          * If the device returns invalid data for the first READ(10)
1051          * command, indicate the command should be retried.
1052          */
1053         if (us->fflags & US_FL_INITIAL_READ10)
1054                 set_bit(US_FLIDX_REDO_READ10, &us->dflags);
1055
1056         /* Acquire all the other resources and add the host */
1057         result = usb_stor_acquire_resources(us);
1058         if (result)
1059                 goto BadDevice;
1060         usb_autopm_get_interface_no_resume(us->pusb_intf);
1061         snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
1062                                         dev_name(&us->pusb_intf->dev));
1063         result = scsi_add_host(us_to_host(us), dev);
1064         if (result) {
1065                 dev_warn(dev,
1066                                 "Unable to add the scsi host\n");
1067                 goto HostAddErr;
1068         }
1069
1070         /* Submit the delayed_work for SCSI-device scanning */
1071         set_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
1072
1073         if (delay_use > 0)
1074                 dev_dbg(dev, "waiting for device to settle before scanning\n");
1075         queue_delayed_work(system_freezable_wq, &us->scan_dwork,
1076                         delay_use * HZ);
1077         return 0;
1078
1079         /* We come here if there are any problems */
1080 HostAddErr:
1081         usb_autopm_put_interface_no_suspend(us->pusb_intf);
1082 BadDevice:
1083         usb_stor_dbg(us, "storage_probe() failed\n");
1084         release_everything(us);
1085         return result;
1086 }
1087 EXPORT_SYMBOL_GPL(usb_stor_probe2);
1088
1089 /* Handle a USB mass-storage disconnect */
1090 void usb_stor_disconnect(struct usb_interface *intf)
1091 {
1092         struct us_data *us = usb_get_intfdata(intf);
1093
1094         quiesce_and_remove_host(us);
1095         release_everything(us);
1096 }
1097 EXPORT_SYMBOL_GPL(usb_stor_disconnect);
1098
1099 static struct scsi_host_template usb_stor_host_template;
1100
1101 /* The main probe routine for standard devices */
1102 static int storage_probe(struct usb_interface *intf,
1103                          const struct usb_device_id *id)
1104 {
1105         struct us_unusual_dev *unusual_dev;
1106         struct us_data *us;
1107         int result;
1108         int size;
1109
1110         /* If uas is enabled and this device can do uas then ignore it. */
1111 #if IS_ENABLED(CONFIG_USB_UAS)
1112         if (uas_use_uas_driver(intf, id, NULL))
1113                 return -ENXIO;
1114 #endif
1115
1116         /*
1117          * If the device isn't standard (is handled by a subdriver
1118          * module) then don't accept it.
1119          */
1120         if (usb_usual_ignore_device(intf))
1121                 return -ENXIO;
1122
1123         /*
1124          * Call the general probe procedures.
1125          *
1126          * The unusual_dev_list array is parallel to the usb_storage_usb_ids
1127          * table, so we use the index of the id entry to find the
1128          * corresponding unusual_devs entry.
1129          */
1130
1131         size = ARRAY_SIZE(us_unusual_dev_list);
1132         if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) {
1133                 unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list;
1134         } else {
1135                 unusual_dev = &for_dynamic_ids;
1136
1137                 dev_dbg(&intf->dev, "Use Bulk-Only transport with the Transparent SCSI protocol for dynamic id: 0x%04x 0x%04x\n",
1138                         id->idVendor, id->idProduct);
1139         }
1140
1141         result = usb_stor_probe1(&us, intf, id, unusual_dev,
1142                                  &usb_stor_host_template);
1143         if (result)
1144                 return result;
1145
1146         /* No special transport or protocol settings in the main module */
1147
1148         result = usb_stor_probe2(us);
1149         return result;
1150 }
1151
1152 static struct usb_driver usb_storage_driver = {
1153         .name =         DRV_NAME,
1154         .probe =        storage_probe,
1155         .disconnect =   usb_stor_disconnect,
1156         .suspend =      usb_stor_suspend,
1157         .resume =       usb_stor_resume,
1158         .reset_resume = usb_stor_reset_resume,
1159         .pre_reset =    usb_stor_pre_reset,
1160         .post_reset =   usb_stor_post_reset,
1161         .id_table =     usb_storage_usb_ids,
1162         .supports_autosuspend = 1,
1163         .soft_unbind =  1,
1164 };
1165
1166 module_usb_stor_driver(usb_storage_driver, usb_stor_host_template, DRV_NAME);