1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Driver for USB Mass Storage compliant devices
   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) 2003-2009 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
  33#ifdef CONFIG_USB_STORAGE_DEBUG
  34#define DEBUG
  35#endif
  36
  37#include <linux/sched.h>
  38#include <linux/errno.h>
  39#include <linux/module.h>
  40#include <linux/slab.h>
  41#include <linux/kthread.h>
  42#include <linux/mutex.h>
  43#include <linux/utsname.h>
  44
  45#include <scsi/scsi.h>
  46#include <scsi/scsi_cmnd.h>
  47#include <scsi/scsi_device.h>
  48
  49#include "usb.h"
  50#include "scsiglue.h"
  51#include "transport.h"
  52#include "protocol.h"
  53#include "debug.h"
  54#include "initializers.h"
  55
  56#include "sierra_ms.h"
  57#include "option_ms.h"
  58
  59#if IS_ENABLED(CONFIG_USB_UAS)
  60#include "uas-detect.h"
  61#endif
  62
  63#define DRV_NAME "usb-storage"
  64
  65/* Some informational data */
  66MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
  67MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
  68MODULE_LICENSE("GPL");
  69
  70static unsigned int delay_use = 1;
  71module_param(delay_use, uint, S_IRUGO | S_IWUSR);
  72MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
  73
  74static char quirks[128];
  75module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
  76MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
  77
  78
  79/*
  80 * The entries in this table correspond, line for line,
  81 * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
  82 */
  83
  84/*
  85 *The vendor name should be kept at eight characters or less, and
  86 * the product name should be kept at 16 characters or less. If a device
  87 * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
  88 * normally generated by a device through the INQUIRY response will be
  89 * taken from this list, and this is the reason for the above size
  90 * restriction. However, if the flag is not present, then you
  91 * are free to use as many characters as you like.
  92 */
  93
  94#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
  95		    vendor_name, product_name, use_protocol, use_transport, \
  96		    init_function, Flags) \
  97{ \
  98	.vendorName = vendor_name,	\
  99	.productName = product_name,	\
 100	.useProtocol = use_protocol,	\
 101	.useTransport = use_transport,	\
 102	.initFunction = init_function,	\
 103}
 104
 105#define COMPLIANT_DEV	UNUSUAL_DEV
 106
 107#define USUAL_DEV(use_protocol, use_transport) \
 108{ \
 109	.useProtocol = use_protocol,	\
 110	.useTransport = use_transport,	\
 111}
 112
 113#define UNUSUAL_VENDOR_INTF(idVendor, cl, sc, pr, \
 114		vendor_name, product_name, use_protocol, use_transport, \
 115		init_function, Flags) \
 116{ \
 117	.vendorName = vendor_name,	\
 118	.productName = product_name,	\
 119	.useProtocol = use_protocol,	\
 120	.useTransport = use_transport,	\
 121	.initFunction = init_function,	\
 122}
 123
 124static const struct us_unusual_dev us_unusual_dev_list[] = {
 125#	include "unusual_devs.h"
 126	{ }		/* Terminating entry */
 127};
 128
 129static const struct us_unusual_dev for_dynamic_ids =
 130		USUAL_DEV(USB_SC_SCSI, USB_PR_BULK);
 131
 132#undef UNUSUAL_DEV
 133#undef COMPLIANT_DEV
 134#undef USUAL_DEV
 135#undef UNUSUAL_VENDOR_INTF
 136
 137#ifdef CONFIG_LOCKDEP
 138
 139static struct lock_class_key us_interface_key[USB_MAXINTERFACES];
 140
 141static void us_set_lock_class(struct mutex *mutex,
 142		struct usb_interface *intf)
 143{
 144	struct usb_device *udev = interface_to_usbdev(intf);
 145	struct usb_host_config *config = udev->actconfig;
 146	int i;
 147
 148	for (i = 0; i < config->desc.bNumInterfaces; i++) {
 149		if (config->interface[i] == intf)
 150			break;
 151	}
 152
 153	BUG_ON(i == config->desc.bNumInterfaces);
 154
 155	lockdep_set_class(mutex, &us_interface_key[i]);
 156}
 157
 158#else
 159
 160static void us_set_lock_class(struct mutex *mutex,
 161		struct usb_interface *intf)
 162{
 163}
 164
 165#endif
 166
 167#ifdef CONFIG_PM	/* Minimal support for suspend and resume */
 168
 169int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
 170{
 171	struct us_data *us = usb_get_intfdata(iface);
 172
 173	/* Wait until no command is running */
 174	mutex_lock(&us->dev_mutex);
 175
 176	if (us->suspend_resume_hook)
 177		(us->suspend_resume_hook)(us, US_SUSPEND);
 178
 179	/*
 180	 * When runtime PM is working, we'll set a flag to indicate
 181	 * whether we should autoresume when a SCSI request arrives.
 182	 */
 183
 184	mutex_unlock(&us->dev_mutex);
 185	return 0;
 186}
 187EXPORT_SYMBOL_GPL(usb_stor_suspend);
 188
 189int usb_stor_resume(struct usb_interface *iface)
 190{
 191	struct us_data *us = usb_get_intfdata(iface);
 192
 193	mutex_lock(&us->dev_mutex);
 194
 195	if (us->suspend_resume_hook)
 196		(us->suspend_resume_hook)(us, US_RESUME);
 197
 198	mutex_unlock(&us->dev_mutex);
 199	return 0;
 200}
 201EXPORT_SYMBOL_GPL(usb_stor_resume);
 202
 203int usb_stor_reset_resume(struct usb_interface *iface)
 204{
 205	struct us_data *us = usb_get_intfdata(iface);
 206
 207	/* Report the reset to the SCSI core */
 208	usb_stor_report_bus_reset(us);
 209
 210	/*
 211	 * If any of the subdrivers implemented a reinitialization scheme,
 212	 * this is where the callback would be invoked.
 213	 */
 214	return 0;
 215}
 216EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
 217
 218#endif /* CONFIG_PM */
 219
 220/*
 221 * The next two routines get called just before and just after
 222 * a USB port reset, whether from this driver or a different one.
 223 */
 224
 225int usb_stor_pre_reset(struct usb_interface *iface)
 226{
 227	struct us_data *us = usb_get_intfdata(iface);
 228
 229	/* Make sure no command runs during the reset */
 230	mutex_lock(&us->dev_mutex);
 231	return 0;
 232}
 233EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
 234
 235int usb_stor_post_reset(struct usb_interface *iface)
 236{
 237	struct us_data *us = usb_get_intfdata(iface);
 238
 239	/* Report the reset to the SCSI core */
 240	usb_stor_report_bus_reset(us);
 241
 242	/*
 243	 * If any of the subdrivers implemented a reinitialization scheme,
 244	 * this is where the callback would be invoked.
 245	 */
 246
 247	mutex_unlock(&us->dev_mutex);
 248	return 0;
 249}
 250EXPORT_SYMBOL_GPL(usb_stor_post_reset);
 251
 252/*
 253 * fill_inquiry_response takes an unsigned char array (which must
 254 * be at least 36 characters) and populates the vendor name,
 255 * product name, and revision fields. Then the array is copied
 256 * into the SCSI command's response buffer (oddly enough
 257 * called request_buffer). data_len contains the length of the
 258 * data array, which again must be at least 36.
 259 */
 260
 261void fill_inquiry_response(struct us_data *us, unsigned char *data,
 262		unsigned int data_len)
 263{
 264	if (data_len < 36) /* You lose. */
 265		return;
 266
 267	memset(data+8, ' ', 28);
 268	if (data[0]&0x20) { /*
 269			     * 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			     */
 279	} else {
 280		u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
 281		int n;
 282
 283		n = strlen(us->unusual_dev->vendorName);
 284		memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
 285		n = strlen(us->unusual_dev->productName);
 286		memcpy(data+16, us->unusual_dev->productName, min(16, n));
 287
 288		data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
 289		data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
 290		data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
 291		data[35] = 0x30 + ((bcdDevice) & 0x0F);
 292	}
 293
 294	usb_stor_set_xfer_buf(data, data_len, us->srb);
 295}
 296EXPORT_SYMBOL_GPL(fill_inquiry_response);
 297
 298static int usb_stor_control_thread(void * __us)
 299{
 300	struct us_data *us = (struct us_data *)__us;
 301	struct Scsi_Host *host = us_to_host(us);
 302	struct scsi_cmnd *srb;
 303
 304	for (;;) {
 305		usb_stor_dbg(us, "*** thread sleeping\n");
 306		if (wait_for_completion_interruptible(&us->cmnd_ready))
 307			break;
 308
 309		usb_stor_dbg(us, "*** thread awakened\n");
 310
 311		/* lock the device pointers */
 312		mutex_lock(&(us->dev_mutex));
 313
 314		/* lock access to the state */
 315		scsi_lock(host);
 316
 317		/* When we are called with no command pending, we're done */
 318		srb = us->srb;
 319		if (srb == NULL) {
 320			scsi_unlock(host);
 321			mutex_unlock(&us->dev_mutex);
 322			usb_stor_dbg(us, "-- exiting\n");
 323			break;
 324		}
 325
 326		/* has the command timed out *already* ? */
 327		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
 328			srb->result = DID_ABORT << 16;
 329			goto SkipForAbort;
 330		}
 331
 332		scsi_unlock(host);
 333
 334		/*
 335		 * reject the command if the direction indicator
 336		 * is UNKNOWN
 337		 */
 338		if (srb->sc_data_direction == DMA_BIDIRECTIONAL) {
 339			usb_stor_dbg(us, "UNKNOWN data direction\n");
 340			srb->result = DID_ERROR << 16;
 341		}
 342
 343		/*
 344		 * reject if target != 0 or if LUN is higher than
 345		 * the maximum known LUN
 346		 */
 347		else if (srb->device->id &&
 348				!(us->fflags & US_FL_SCM_MULT_TARG)) {
 349			usb_stor_dbg(us, "Bad target number (%d:%llu)\n",
 350				     srb->device->id,
 351				     srb->device->lun);
 352			srb->result = DID_BAD_TARGET << 16;
 353		}
 354
 355		else if (srb->device->lun > us->max_lun) {
 356			usb_stor_dbg(us, "Bad LUN (%d:%llu)\n",
 357				     srb->device->id,
 358				     srb->device->lun);
 359			srb->result = DID_BAD_TARGET << 16;
 360		}
 361
 362		/*
 363		 * Handle those devices which need us to fake
 364		 * their inquiry data
 365		 */
 366		else if ((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			usb_stor_dbg(us, "Faking INQUIRY command\n");
 373			fill_inquiry_response(us, data_ptr, 36);
 374			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(srb, us);
 381			usb_mark_last_busy(us->pusb_dev);
 382		}
 383
 384		/* lock access to the state */
 385		scsi_lock(host);
 386
 387		/* was the command aborted? */
 388		if (srb->result == DID_ABORT << 16) {
 389SkipForAbort:
 390			usb_stor_dbg(us, "scsi command aborted\n");
 391			srb = NULL;	/* Don't call srb->scsi_done() */
 392		}
 393
 394		/*
 395		 * If an abort request was received we need to signal that
 396		 * the abort has finished.  The proper test for this is
 397		 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
 398		 * the timeout might have occurred after the command had
 399		 * already completed with a different result code.
 400		 */
 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
 416		/* now that the locks are released, notify the SCSI core */
 417		if (srb) {
 418			usb_stor_dbg(us, "scsi cmd done, result=0x%x\n",
 419					srb->result);
 420			srb->scsi_done(srb);
 421		}
 422	} /* for (;;) */
 423
 424	/* Wait until we are told to stop */
 425	for (;;) {
 426		set_current_state(TASK_INTERRUPTIBLE);
 427		if (kthread_should_stop())
 428			break;
 429		schedule();
 430	}
 431	__set_current_state(TASK_RUNNING);
 432	return 0;
 433}
 434
 435/***********************************************************************
 436 * Device probing and disconnecting
 437 ***********************************************************************/
 438
 439/* Associate our private data with the USB device */
 440static int associate_dev(struct us_data *us, struct usb_interface *intf)
 441{
 442	/* Fill in the device-related fields */
 443	us->pusb_dev = interface_to_usbdev(intf);
 444	us->pusb_intf = intf;
 445	us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 446	usb_stor_dbg(us, "Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
 447		     le16_to_cpu(us->pusb_dev->descriptor.idVendor),
 448		     le16_to_cpu(us->pusb_dev->descriptor.idProduct),
 449		     le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
 450	usb_stor_dbg(us, "Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
 451		     intf->cur_altsetting->desc.bInterfaceSubClass,
 452		     intf->cur_altsetting->desc.bInterfaceProtocol);
 453
 454	/* Store our private data in the interface */
 455	usb_set_intfdata(intf, us);
 456
 457	/* Allocate the control/setup and DMA-mapped buffers */
 458	us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
 459	if (!us->cr)
 460		return -ENOMEM;
 461
 462	us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE,
 463			GFP_KERNEL, &us->iobuf_dma);
 464	if (!us->iobuf) {
 465		usb_stor_dbg(us, "I/O buffer allocation failed\n");
 466		return -ENOMEM;
 467	}
 468	return 0;
 469}
 470
 471/* Works only for digits and letters, but small and fast */
 472#define TOLOWER(x) ((x) | 0x20)
 473
 474/* Adjust device flags based on the "quirks=" module parameter */
 475void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags)
 476{
 477	char *p;
 478	u16 vid = le16_to_cpu(udev->descriptor.idVendor);
 479	u16 pid = le16_to_cpu(udev->descriptor.idProduct);
 480	unsigned f = 0;
 481	unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE |
 482			US_FL_FIX_CAPACITY | US_FL_IGNORE_UAS |
 483			US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
 484			US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
 485			US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
 486			US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
 487			US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
 488			US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE |
 489			US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES |
 490			US_FL_MAX_SECTORS_240 | US_FL_NO_REPORT_LUNS |
 491			US_FL_ALWAYS_SYNC);
 492
 493	p = quirks;
 494	while (*p) {
 495		/* Each entry consists of VID:PID:flags */
 496		if (vid == simple_strtoul(p, &p, 16) &&
 497				*p == ':' &&
 498				pid == simple_strtoul(p+1, &p, 16) &&
 499				*p == ':')
 500			break;
 501
 502		/* Move forward to the next entry */
 503		while (*p) {
 504			if (*p++ == ',')
 505				break;
 506		}
 507	}
 508	if (!*p)	/* No match */
 509		return;
 510
 511	/* Collect the flags */
 512	while (*++p && *p != ',') {
 513		switch (TOLOWER(*p)) {
 514		case 'a':
 515			f |= US_FL_SANE_SENSE;
 516			break;
 517		case 'b':
 518			f |= US_FL_BAD_SENSE;
 519			break;
 520		case 'c':
 521			f |= US_FL_FIX_CAPACITY;
 522			break;
 523		case 'd':
 524			f |= US_FL_NO_READ_DISC_INFO;
 525			break;
 526		case 'e':
 527			f |= US_FL_NO_READ_CAPACITY_16;
 528			break;
 529		case 'f':
 530			f |= US_FL_NO_REPORT_OPCODES;
 531			break;
 532		case 'g':
 533			f |= US_FL_MAX_SECTORS_240;
 534			break;
 535		case 'h':
 536			f |= US_FL_CAPACITY_HEURISTICS;
 537			break;
 538		case 'i':
 539			f |= US_FL_IGNORE_DEVICE;
 540			break;
 541		case 'j':
 542			f |= US_FL_NO_REPORT_LUNS;
 543			break;
 
 
 
 544		case 'l':
 545			f |= US_FL_NOT_LOCKABLE;
 546			break;
 547		case 'm':
 548			f |= US_FL_MAX_SECTORS_64;
 549			break;
 550		case 'n':
 551			f |= US_FL_INITIAL_READ10;
 552			break;
 553		case 'o':
 554			f |= US_FL_CAPACITY_OK;
 555			break;
 556		case 'p':
 557			f |= US_FL_WRITE_CACHE;
 558			break;
 559		case 'r':
 560			f |= US_FL_IGNORE_RESIDUE;
 561			break;
 562		case 's':
 563			f |= US_FL_SINGLE_LUN;
 564			break;
 565		case 't':
 566			f |= US_FL_NO_ATA_1X;
 567			break;
 568		case 'u':
 569			f |= US_FL_IGNORE_UAS;
 570			break;
 571		case 'w':
 572			f |= US_FL_NO_WP_DETECT;
 573			break;
 574		case 'y':
 575			f |= US_FL_ALWAYS_SYNC;
 576			break;
 577		/* Ignore unrecognized flag characters */
 578		}
 579	}
 580	*fflags = (*fflags & ~mask) | f;
 581}
 582EXPORT_SYMBOL_GPL(usb_stor_adjust_quirks);
 583
 584/* Get the unusual_devs entries and the string descriptors */
 585static int get_device_info(struct us_data *us, const struct usb_device_id *id,
 586		const struct us_unusual_dev *unusual_dev)
 587{
 588	struct usb_device *dev = us->pusb_dev;
 589	struct usb_interface_descriptor *idesc =
 590		&us->pusb_intf->cur_altsetting->desc;
 591	struct device *pdev = &us->pusb_intf->dev;
 592
 593	/* Store the entries */
 594	us->unusual_dev = unusual_dev;
 595	us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ?
 596			idesc->bInterfaceSubClass :
 597			unusual_dev->useProtocol;
 598	us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ?
 599			idesc->bInterfaceProtocol :
 600			unusual_dev->useTransport;
 601	us->fflags = id->driver_info;
 602	usb_stor_adjust_quirks(us->pusb_dev, &us->fflags);
 603
 604	if (us->fflags & US_FL_IGNORE_DEVICE) {
 605		dev_info(pdev, "device ignored\n");
 606		return -ENODEV;
 607	}
 608
 609	/*
 610	 * This flag is only needed when we're in high-speed, so let's
 611	 * disable it if we're in full-speed
 612	 */
 613	if (dev->speed != USB_SPEED_HIGH)
 614		us->fflags &= ~US_FL_GO_SLOW;
 615
 616	if (us->fflags)
 617		dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n",
 618				le16_to_cpu(dev->descriptor.idVendor),
 619				le16_to_cpu(dev->descriptor.idProduct),
 620				us->fflags);
 621
 622	/*
 623	 * Log a message if a non-generic unusual_dev entry contains an
 624	 * unnecessary subclass or protocol override.  This may stimulate
 625	 * reports from users that will help us remove unneeded entries
 626	 * from the unusual_devs.h table.
 627	 */
 628	if (id->idVendor || id->idProduct) {
 629		static const char *msgs[3] = {
 630			"an unneeded SubClass entry",
 631			"an unneeded Protocol entry",
 632			"unneeded SubClass and Protocol entries"};
 633		struct usb_device_descriptor *ddesc = &dev->descriptor;
 634		int msg = -1;
 635
 636		if (unusual_dev->useProtocol != USB_SC_DEVICE &&
 637			us->subclass == idesc->bInterfaceSubClass)
 638			msg += 1;
 639		if (unusual_dev->useTransport != USB_PR_DEVICE &&
 640			us->protocol == idesc->bInterfaceProtocol)
 641			msg += 2;
 642		if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
 643			dev_notice(pdev, "This device "
 644					"(%04x,%04x,%04x S %02x P %02x)"
 645					" has %s in unusual_devs.h (kernel"
 646					" %s)\n"
 647					"   Please send a copy of this message to "
 648					"<linux-usb@vger.kernel.org> and "
 649					"<usb-storage@lists.one-eyed-alien.net>\n",
 650					le16_to_cpu(ddesc->idVendor),
 651					le16_to_cpu(ddesc->idProduct),
 652					le16_to_cpu(ddesc->bcdDevice),
 653					idesc->bInterfaceSubClass,
 654					idesc->bInterfaceProtocol,
 655					msgs[msg],
 656					utsname()->release);
 657	}
 658
 659	return 0;
 660}
 661
 662/* Get the transport settings */
 663static void get_transport(struct us_data *us)
 664{
 665	switch (us->protocol) {
 666	case USB_PR_CB:
 667		us->transport_name = "Control/Bulk";
 668		us->transport = usb_stor_CB_transport;
 669		us->transport_reset = usb_stor_CB_reset;
 670		us->max_lun = 7;
 671		break;
 672
 673	case USB_PR_CBI:
 674		us->transport_name = "Control/Bulk/Interrupt";
 675		us->transport = usb_stor_CB_transport;
 676		us->transport_reset = usb_stor_CB_reset;
 677		us->max_lun = 7;
 678		break;
 679
 680	case USB_PR_BULK:
 681		us->transport_name = "Bulk";
 682		us->transport = usb_stor_Bulk_transport;
 683		us->transport_reset = usb_stor_Bulk_reset;
 684		break;
 685	}
 686}
 687
 688/* Get the protocol settings */
 689static void get_protocol(struct us_data *us)
 690{
 691	switch (us->subclass) {
 692	case USB_SC_RBC:
 693		us->protocol_name = "Reduced Block Commands (RBC)";
 694		us->proto_handler = usb_stor_transparent_scsi_command;
 695		break;
 696
 697	case USB_SC_8020:
 698		us->protocol_name = "8020i";
 699		us->proto_handler = usb_stor_pad12_command;
 700		us->max_lun = 0;
 701		break;
 702
 703	case USB_SC_QIC:
 704		us->protocol_name = "QIC-157";
 705		us->proto_handler = usb_stor_pad12_command;
 706		us->max_lun = 0;
 707		break;
 708
 709	case USB_SC_8070:
 710		us->protocol_name = "8070i";
 711		us->proto_handler = usb_stor_pad12_command;
 712		us->max_lun = 0;
 713		break;
 714
 715	case USB_SC_SCSI:
 716		us->protocol_name = "Transparent SCSI";
 717		us->proto_handler = usb_stor_transparent_scsi_command;
 718		break;
 719
 720	case USB_SC_UFI:
 721		us->protocol_name = "Uniform Floppy Interface (UFI)";
 722		us->proto_handler = usb_stor_ufi_command;
 723		break;
 724	}
 725}
 726
 727/* Get the pipe settings */
 728static int get_pipes(struct us_data *us)
 729{
 730	struct usb_host_interface *alt = us->pusb_intf->cur_altsetting;
 731	struct usb_endpoint_descriptor *ep_in;
 732	struct usb_endpoint_descriptor *ep_out;
 733	struct usb_endpoint_descriptor *ep_int;
 734	int res;
 735
 736	/*
 737	 * Find the first endpoint of each type we need.
 738	 * We are expecting a minimum of 2 endpoints - in and out (bulk).
 739	 * An optional interrupt-in is OK (necessary for CBI protocol).
 740	 * We will ignore any others.
 741	 */
 742	res = usb_find_common_endpoints(alt, &ep_in, &ep_out, NULL, NULL);
 743	if (res) {
 744		usb_stor_dbg(us, "bulk endpoints not found\n");
 745		return res;
 746	}
 747
 748	res = usb_find_int_in_endpoint(alt, &ep_int);
 749	if (res && us->protocol == USB_PR_CBI) {
 750		usb_stor_dbg(us, "interrupt endpoint not found\n");
 751		return res;
 752	}
 753
 754	/* Calculate and store the pipe values */
 755	us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
 756	us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
 757	us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
 758		usb_endpoint_num(ep_out));
 759	us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
 760		usb_endpoint_num(ep_in));
 761	if (ep_int) {
 762		us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
 763			usb_endpoint_num(ep_int));
 764		us->ep_bInterval = ep_int->bInterval;
 765	}
 766	return 0;
 767}
 768
 769/* Initialize all the dynamic resources we need */
 770static int usb_stor_acquire_resources(struct us_data *us)
 771{
 772	int p;
 773	struct task_struct *th;
 774
 775	us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
 776	if (!us->current_urb)
 777		return -ENOMEM;
 778
 779	/*
 780	 * Just before we start our control thread, initialize
 781	 * the device if it needs initialization
 782	 */
 783	if (us->unusual_dev->initFunction) {
 784		p = us->unusual_dev->initFunction(us);
 785		if (p)
 786			return p;
 787	}
 788
 789	/* Start up our control thread */
 790	th = kthread_run(usb_stor_control_thread, us, "usb-storage");
 791	if (IS_ERR(th)) {
 792		dev_warn(&us->pusb_intf->dev,
 793				"Unable to start control thread\n");
 794		return PTR_ERR(th);
 795	}
 796	us->ctl_thread = th;
 797
 798	return 0;
 799}
 800
 801/* Release all our dynamic resources */
 802static void usb_stor_release_resources(struct us_data *us)
 803{
 804	/*
 805	 * Tell the control thread to exit.  The SCSI host must
 806	 * already have been removed and the DISCONNECTING flag set
 807	 * so that we won't accept any more commands.
 808	 */
 809	usb_stor_dbg(us, "-- sending exit command to thread\n");
 810	complete(&us->cmnd_ready);
 811	if (us->ctl_thread)
 812		kthread_stop(us->ctl_thread);
 813
 814	/* Call the destructor routine, if it exists */
 815	if (us->extra_destructor) {
 816		usb_stor_dbg(us, "-- calling extra_destructor()\n");
 817		us->extra_destructor(us->extra);
 818	}
 819
 820	/* Free the extra data and the URB */
 821	kfree(us->extra);
 822	usb_free_urb(us->current_urb);
 823}
 824
 825/* Dissociate from the USB device */
 826static void dissociate_dev(struct us_data *us)
 827{
 828	/* Free the buffers */
 829	kfree(us->cr);
 830	usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
 831
 832	/* Remove our private data from the interface */
 833	usb_set_intfdata(us->pusb_intf, NULL);
 834}
 835
 836/*
 837 * First stage of disconnect processing: stop SCSI scanning,
 838 * remove the host, and stop accepting new commands
 839 */
 840static void quiesce_and_remove_host(struct us_data *us)
 841{
 842	struct Scsi_Host *host = us_to_host(us);
 843
 844	/* If the device is really gone, cut short reset delays */
 845	if (us->pusb_dev->state == USB_STATE_NOTATTACHED) {
 846		set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 847		wake_up(&us->delay_wait);
 848	}
 849
 850	/*
 851	 * Prevent SCSI scanning (if it hasn't started yet)
 852	 * or wait for the SCSI-scanning routine to stop.
 853	 */
 854	cancel_delayed_work_sync(&us->scan_dwork);
 855
 856	/* Balance autopm calls if scanning was cancelled */
 857	if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags))
 858		usb_autopm_put_interface_no_suspend(us->pusb_intf);
 859
 860	/*
 861	 * Removing the host will perform an orderly shutdown: caches
 862	 * synchronized, disks spun down, etc.
 863	 */
 864	scsi_remove_host(host);
 865
 866	/*
 867	 * Prevent any new commands from being accepted and cut short
 868	 * reset delays.
 869	 */
 870	scsi_lock(host);
 871	set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
 872	scsi_unlock(host);
 873	wake_up(&us->delay_wait);
 874}
 875
 876/* Second stage of disconnect processing: deallocate all resources */
 877static void release_everything(struct us_data *us)
 878{
 879	usb_stor_release_resources(us);
 880	dissociate_dev(us);
 881
 882	/*
 883	 * Drop our reference to the host; the SCSI core will free it
 884	 * (and "us" along with it) when the refcount becomes 0.
 885	 */
 886	scsi_host_put(us_to_host(us));
 887}
 888
 889/* Delayed-work routine to carry out SCSI-device scanning */
 890static void usb_stor_scan_dwork(struct work_struct *work)
 891{
 892	struct us_data *us = container_of(work, struct us_data,
 893			scan_dwork.work);
 894	struct device *dev = &us->pusb_intf->dev;
 895
 896	dev_dbg(dev, "starting scan\n");
 897
 898	/* For bulk-only devices, determine the max LUN value */
 899	if (us->protocol == USB_PR_BULK &&
 900	    !(us->fflags & US_FL_SINGLE_LUN) &&
 901	    !(us->fflags & US_FL_SCM_MULT_TARG)) {
 902		mutex_lock(&us->dev_mutex);
 903		us->max_lun = usb_stor_Bulk_max_lun(us);
 904		/*
 905		 * Allow proper scanning of devices that present more than 8 LUNs
 906		 * While not affecting other devices that may need the previous
 907		 * behavior
 908		 */
 909		if (us->max_lun >= 8)
 910			us_to_host(us)->max_lun = us->max_lun+1;
 911		mutex_unlock(&us->dev_mutex);
 912	}
 913	scsi_scan_host(us_to_host(us));
 914	dev_dbg(dev, "scan complete\n");
 915
 916	/* Should we unbind if no devices were detected? */
 917
 918	usb_autopm_put_interface(us->pusb_intf);
 919	clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
 920}
 921
 922static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
 923{
 924	struct usb_device *usb_dev = interface_to_usbdev(intf);
 925
 926	if (usb_dev->bus->sg_tablesize) {
 927		return usb_dev->bus->sg_tablesize;
 928	}
 929	return SG_ALL;
 930}
 931
 932/* First part of general USB mass-storage probing */
 933int usb_stor_probe1(struct us_data **pus,
 934		struct usb_interface *intf,
 935		const struct usb_device_id *id,
 936		const struct us_unusual_dev *unusual_dev,
 937		struct scsi_host_template *sht)
 938{
 939	struct Scsi_Host *host;
 940	struct us_data *us;
 941	int result;
 942
 943	dev_info(&intf->dev, "USB Mass Storage device detected\n");
 944
 945	/*
 946	 * Ask the SCSI layer to allocate a host structure, with extra
 947	 * space at the end for our private us_data structure.
 948	 */
 949	host = scsi_host_alloc(sht, sizeof(*us));
 950	if (!host) {
 951		dev_warn(&intf->dev, "Unable to allocate the scsi host\n");
 952		return -ENOMEM;
 953	}
 954
 955	/*
 956	 * Allow 16-byte CDBs and thus > 2TB
 957	 */
 958	host->max_cmd_len = 16;
 959	host->sg_tablesize = usb_stor_sg_tablesize(intf);
 960	*pus = us = host_to_us(host);
 961	mutex_init(&(us->dev_mutex));
 962	us_set_lock_class(&us->dev_mutex, intf);
 963	init_completion(&us->cmnd_ready);
 964	init_completion(&(us->notify));
 965	init_waitqueue_head(&us->delay_wait);
 966	INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork);
 967
 968	/* Associate the us_data structure with the USB device */
 969	result = associate_dev(us, intf);
 970	if (result)
 971		goto BadDevice;
 972
 973	/* Get the unusual_devs entries and the descriptors */
 974	result = get_device_info(us, id, unusual_dev);
 975	if (result)
 976		goto BadDevice;
 977
 978	/* Get standard transport and protocol settings */
 979	get_transport(us);
 980	get_protocol(us);
 981
 982	/*
 983	 * Give the caller a chance to fill in specialized transport
 984	 * or protocol settings.
 985	 */
 986	return 0;
 987
 988BadDevice:
 989	usb_stor_dbg(us, "storage_probe() failed\n");
 990	release_everything(us);
 991	return result;
 992}
 993EXPORT_SYMBOL_GPL(usb_stor_probe1);
 994
 995/* Second part of general USB mass-storage probing */
 996int usb_stor_probe2(struct us_data *us)
 997{
 998	int result;
 999	struct device *dev = &us->pusb_intf->dev;
1000
1001	/* Make sure the transport and protocol have both been set */
1002	if (!us->transport || !us->proto_handler) {
1003		result = -ENXIO;
1004		goto BadDevice;
1005	}
1006	usb_stor_dbg(us, "Transport: %s\n", us->transport_name);
1007	usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name);
1008
1009	if (us->fflags & US_FL_SCM_MULT_TARG) {
1010		/*
1011		 * SCM eUSCSI bridge devices can have different numbers
1012		 * of LUNs on different targets; allow all to be probed.
1013		 */
1014		us->max_lun = 7;
1015		/* The eUSCSI itself has ID 7, so avoid scanning that */
1016		us_to_host(us)->this_id = 7;
1017		/* max_id is 8 initially, so no need to set it here */
1018	} else {
1019		/* In the normal case there is only a single target */
1020		us_to_host(us)->max_id = 1;
1021		/*
1022		 * Like Windows, we won't store the LUN bits in CDB[1] for
1023		 * SCSI-2 devices using the Bulk-Only transport (even though
1024		 * this violates the SCSI spec).
1025		 */
1026		if (us->transport == usb_stor_Bulk_transport)
1027			us_to_host(us)->no_scsi2_lun_in_cdb = 1;
1028	}
1029
1030	/* fix for single-lun devices */
1031	if (us->fflags & US_FL_SINGLE_LUN)
1032		us->max_lun = 0;
1033
1034	/* Find the endpoints and calculate pipe values */
1035	result = get_pipes(us);
1036	if (result)
1037		goto BadDevice;
1038
1039	/*
1040	 * If the device returns invalid data for the first READ(10)
1041	 * command, indicate the command should be retried.
1042	 */
1043	if (us->fflags & US_FL_INITIAL_READ10)
1044		set_bit(US_FLIDX_REDO_READ10, &us->dflags);
1045
1046	/* Acquire all the other resources and add the host */
1047	result = usb_stor_acquire_resources(us);
1048	if (result)
1049		goto BadDevice;
1050	usb_autopm_get_interface_no_resume(us->pusb_intf);
1051	snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
1052					dev_name(&us->pusb_intf->dev));
1053	result = scsi_add_host(us_to_host(us), dev);
1054	if (result) {
1055		dev_warn(dev,
1056				"Unable to add the scsi host\n");
1057		goto HostAddErr;
1058	}
1059
1060	/* Submit the delayed_work for SCSI-device scanning */
1061	set_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
1062
1063	if (delay_use > 0)
1064		dev_dbg(dev, "waiting for device to settle before scanning\n");
1065	queue_delayed_work(system_freezable_wq, &us->scan_dwork,
1066			delay_use * HZ);
1067	return 0;
1068
1069	/* We come here if there are any problems */
1070HostAddErr:
1071	usb_autopm_put_interface_no_suspend(us->pusb_intf);
1072BadDevice:
1073	usb_stor_dbg(us, "storage_probe() failed\n");
1074	release_everything(us);
1075	return result;
1076}
1077EXPORT_SYMBOL_GPL(usb_stor_probe2);
1078
1079/* Handle a USB mass-storage disconnect */
1080void usb_stor_disconnect(struct usb_interface *intf)
1081{
1082	struct us_data *us = usb_get_intfdata(intf);
1083
1084	quiesce_and_remove_host(us);
1085	release_everything(us);
1086}
1087EXPORT_SYMBOL_GPL(usb_stor_disconnect);
1088
1089static struct scsi_host_template usb_stor_host_template;
1090
1091/* The main probe routine for standard devices */
1092static int storage_probe(struct usb_interface *intf,
1093			 const struct usb_device_id *id)
1094{
1095	const struct us_unusual_dev *unusual_dev;
1096	struct us_data *us;
1097	int result;
1098	int size;
1099
1100	/* If uas is enabled and this device can do uas then ignore it. */
1101#if IS_ENABLED(CONFIG_USB_UAS)
1102	if (uas_use_uas_driver(intf, id, NULL))
1103		return -ENXIO;
1104#endif
1105
1106	/*
1107	 * If the device isn't standard (is handled by a subdriver
1108	 * module) then don't accept it.
1109	 */
1110	if (usb_usual_ignore_device(intf))
1111		return -ENXIO;
1112
1113	/*
1114	 * Call the general probe procedures.
1115	 *
1116	 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
1117	 * table, so we use the index of the id entry to find the
1118	 * corresponding unusual_devs entry.
1119	 */
1120
1121	size = ARRAY_SIZE(us_unusual_dev_list);
1122	if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) {
1123		unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list;
1124	} else {
1125		unusual_dev = &for_dynamic_ids;
1126
1127		dev_dbg(&intf->dev, "Use Bulk-Only transport with the Transparent SCSI protocol for dynamic id: 0x%04x 0x%04x\n",
1128			id->idVendor, id->idProduct);
1129	}
1130
1131	result = usb_stor_probe1(&us, intf, id, unusual_dev,
1132				 &usb_stor_host_template);
1133	if (result)
1134		return result;
1135
1136	/* No special transport or protocol settings in the main module */
1137
1138	result = usb_stor_probe2(us);
1139	return result;
1140}
1141
1142static struct usb_driver usb_storage_driver = {
1143	.name =		DRV_NAME,
1144	.probe =	storage_probe,
1145	.disconnect =	usb_stor_disconnect,
1146	.suspend =	usb_stor_suspend,
1147	.resume =	usb_stor_resume,
1148	.reset_resume =	usb_stor_reset_resume,
1149	.pre_reset =	usb_stor_pre_reset,
1150	.post_reset =	usb_stor_post_reset,
1151	.id_table =	usb_storage_usb_ids,
1152	.supports_autosuspend = 1,
1153	.soft_unbind =	1,
1154};
1155
1156module_usb_stor_driver(usb_storage_driver, usb_stor_host_template, DRV_NAME);