Initial import

1 files changed, 1140 insertions, 0 deletions

diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
new file mode 100644
index 000000000..6c10c888f
--- /dev/null
+++ b/drivers/usb/storage/usb.c
@@ -0,0 +1,1140 @@
+/* Driver for USB Mass Storage compliant devices
+ *
+ * Current development and maintenance by:
+ *   (c) 1999-2003 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
+ *
+ * Developed with the assistance of:
+ *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
+ *   (c) 2003-2009 Alan Stern (stern@rowland.harvard.edu)
+ *
+ * Initial work by:
+ *   (c) 1999 Michael Gee (michael@linuxspecific.com)
+ *
+ * usb_device_id support by Adam J. Richter (adam@yggdrasil.com):
+ *   (c) 2000 Yggdrasil Computing, Inc.
+ *
+ * This driver is based on the 'USB Mass Storage Class' document. This
+ * describes in detail the protocol used to communicate with such
+ * devices.  Clearly, the designers had SCSI and ATAPI commands in
+ * mind when they created this document.  The commands are all very
+ * similar to commands in the SCSI-II and ATAPI specifications.
+ *
+ * It is important to note that in a number of cases this class
+ * exhibits class-specific exemptions from the USB specification.
+ * Notably the usage of NAK, STALL and ACK differs from the norm, in
+ * that they are used to communicate wait, failed and OK on commands.
+ *
+ * Also, for certain devices, the interrupt endpoint is used to convey
+ * status of a command.
+ *
+ * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
+ * information about this driver.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifdef CONFIG_USB_STORAGE_DEBUG
+#define DEBUG
+#endif
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/freezer.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/utsname.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+
+#include "usb.h"
+#include "scsiglue.h"
+#include "transport.h"
+#include "protocol.h"
+#include "debug.h"
+#include "initializers.h"
+
+#include "sierra_ms.h"
+#include "option_ms.h"
+
+#if IS_ENABLED(CONFIG_USB_UAS)
+#include "uas-detect.h"
+#endif
+
+/* Some informational data */
+MODULE_AUTHOR("Matthew Dharm <mdharm-usb@one-eyed-alien.net>");
+MODULE_DESCRIPTION("USB Mass Storage driver for Linux");
+MODULE_LICENSE("GPL");
+
+static unsigned int delay_use = 1;
+module_param(delay_use, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(delay_use, "seconds to delay before using a new device");
+
+static char quirks[128];
+module_param_string(quirks, quirks, sizeof(quirks), S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(quirks, "supplemental list of device IDs and their quirks");
+
+
+/*
+ * The entries in this table correspond, line for line,
+ * with the entries in usb_storage_usb_ids[], defined in usual-tables.c.
+ */
+
+/* The vendor name should be kept at eight characters or less, and
+ * the product name should be kept at 16 characters or less. If a device
+ * has the US_FL_FIX_INQUIRY flag, then the vendor and product names
+ * normally generated by a device through the INQUIRY response will be
+ * taken from this list, and this is the reason for the above size
+ * restriction. However, if the flag is not present, then you
+ * are free to use as many characters as you like.
+ */
+
+#define UNUSUAL_DEV(idVendor, idProduct, bcdDeviceMin, bcdDeviceMax, \
+		    vendor_name, product_name, use_protocol, use_transport, \
+		    init_function, Flags) \
+{ \
+	.vendorName = vendor_name,	\
+	.productName = product_name,	\
+	.useProtocol = use_protocol,	\
+	.useTransport = use_transport,	\
+	.initFunction = init_function,	\
+}
+
+#define COMPLIANT_DEV	UNUSUAL_DEV
+
+#define USUAL_DEV(use_protocol, use_transport) \
+{ \
+	.useProtocol = use_protocol,	\
+	.useTransport = use_transport,	\
+}
+
+#define UNUSUAL_VENDOR_INTF(idVendor, cl, sc, pr, \
+		vendor_name, product_name, use_protocol, use_transport, \
+		init_function, Flags) \
+{ \
+	.vendorName = vendor_name,	\
+	.productName = product_name,	\
+	.useProtocol = use_protocol,	\
+	.useTransport = use_transport,	\
+	.initFunction = init_function,	\
+}
+
+static struct us_unusual_dev us_unusual_dev_list[] = {
+#	include "unusual_devs.h"
+	{ }		/* Terminating entry */
+};
+
+static struct us_unusual_dev for_dynamic_ids =
+		USUAL_DEV(USB_SC_SCSI, USB_PR_BULK);
+
+#undef UNUSUAL_DEV
+#undef COMPLIANT_DEV
+#undef USUAL_DEV
+#undef UNUSUAL_VENDOR_INTF
+
+#ifdef CONFIG_LOCKDEP
+
+static struct lock_class_key us_interface_key[USB_MAXINTERFACES];
+
+static void us_set_lock_class(struct mutex *mutex,
+		struct usb_interface *intf)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct usb_host_config *config = udev->actconfig;
+	int i;
+
+	for (i = 0; i < config->desc.bNumInterfaces; i++) {
+		if (config->interface[i] == intf)
+			break;
+	}
+
+	BUG_ON(i == config->desc.bNumInterfaces);
+
+	lockdep_set_class(mutex, &us_interface_key[i]);
+}
+
+#else
+
+static void us_set_lock_class(struct mutex *mutex,
+		struct usb_interface *intf)
+{
+}
+
+#endif
+
+#ifdef CONFIG_PM	/* Minimal support for suspend and resume */
+
+int usb_stor_suspend(struct usb_interface *iface, pm_message_t message)
+{
+	struct us_data *us = usb_get_intfdata(iface);
+
+	/* Wait until no command is running */
+	mutex_lock(&us->dev_mutex);
+
+	if (us->suspend_resume_hook)
+		(us->suspend_resume_hook)(us, US_SUSPEND);
+
+	/* When runtime PM is working, we'll set a flag to indicate
+	 * whether we should autoresume when a SCSI request arrives. */
+
+	mutex_unlock(&us->dev_mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_stor_suspend);
+
+int usb_stor_resume(struct usb_interface *iface)
+{
+	struct us_data *us = usb_get_intfdata(iface);
+
+	mutex_lock(&us->dev_mutex);
+
+	if (us->suspend_resume_hook)
+		(us->suspend_resume_hook)(us, US_RESUME);
+
+	mutex_unlock(&us->dev_mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_stor_resume);
+
+int usb_stor_reset_resume(struct usb_interface *iface)
+{
+	struct us_data *us = usb_get_intfdata(iface);
+
+	/* Report the reset to the SCSI core */
+	usb_stor_report_bus_reset(us);
+
+	/* FIXME: Notify the subdrivers that they need to reinitialize
+	 * the device */
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_stor_reset_resume);
+
+#endif /* CONFIG_PM */
+
+/*
+ * The next two routines get called just before and just after
+ * a USB port reset, whether from this driver or a different one.
+ */
+
+int usb_stor_pre_reset(struct usb_interface *iface)
+{
+	struct us_data *us = usb_get_intfdata(iface);
+
+	/* Make sure no command runs during the reset */
+	mutex_lock(&us->dev_mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_stor_pre_reset);
+
+int usb_stor_post_reset(struct usb_interface *iface)
+{
+	struct us_data *us = usb_get_intfdata(iface);
+
+	/* Report the reset to the SCSI core */
+	usb_stor_report_bus_reset(us);
+
+	/* FIXME: Notify the subdrivers that they need to reinitialize
+	 * the device */
+
+	mutex_unlock(&us->dev_mutex);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(usb_stor_post_reset);
+
+/*
+ * fill_inquiry_response takes an unsigned char array (which must
+ * be at least 36 characters) and populates the vendor name,
+ * product name, and revision fields. Then the array is copied
+ * into the SCSI command's response buffer (oddly enough
+ * called request_buffer). data_len contains the length of the
+ * data array, which again must be at least 36.
+ */
+
+void fill_inquiry_response(struct us_data *us, unsigned char *data,
+		unsigned int data_len)
+{
+	if (data_len < 36) /* You lose. */
+		return;
+
+	memset(data+8, ' ', 28);
+	if (data[0]&0x20) { /* USB device currently not connected. Return
+			      peripheral qualifier 001b ("...however, the
+			      physical device is not currently connected
+			      to this logical unit") and leave vendor and
+			      product identification empty. ("If the target
+			      does store some of the INQUIRY data on the
+			      device, it may return zeros or ASCII spaces
+			      (20h) in those fields until the data is
+			      available from the device."). */
+	} else {
+		u16 bcdDevice = le16_to_cpu(us->pusb_dev->descriptor.bcdDevice);
+		int n;
+
+		n = strlen(us->unusual_dev->vendorName);
+		memcpy(data+8, us->unusual_dev->vendorName, min(8, n));
+		n = strlen(us->unusual_dev->productName);
+		memcpy(data+16, us->unusual_dev->productName, min(16, n));
+
+		data[32] = 0x30 + ((bcdDevice>>12) & 0x0F);
+		data[33] = 0x30 + ((bcdDevice>>8) & 0x0F);
+		data[34] = 0x30 + ((bcdDevice>>4) & 0x0F);
+		data[35] = 0x30 + ((bcdDevice) & 0x0F);
+	}
+
+	usb_stor_set_xfer_buf(data, data_len, us->srb);
+}
+EXPORT_SYMBOL_GPL(fill_inquiry_response);
+
+static int usb_stor_control_thread(void * __us)
+{
+	struct us_data *us = (struct us_data *)__us;
+	struct Scsi_Host *host = us_to_host(us);
+
+	for (;;) {
+		usb_stor_dbg(us, "*** thread sleeping\n");
+		if (wait_for_completion_interruptible(&us->cmnd_ready))
+			break;
+
+		usb_stor_dbg(us, "*** thread awakened\n");
+
+		/* lock the device pointers */
+		mutex_lock(&(us->dev_mutex));
+
+		/* lock access to the state */
+		scsi_lock(host);
+
+		/* When we are called with no command pending, we're done */
+		if (us->srb == NULL) {
+			scsi_unlock(host);
+			mutex_unlock(&us->dev_mutex);
+			usb_stor_dbg(us, "-- exiting\n");
+			break;
+		}
+
+		/* has the command timed out *already* ? */
+		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
+			us->srb->result = DID_ABORT << 16;
+			goto SkipForAbort;
+		}
+
+		scsi_unlock(host);
+
+		/* reject the command if the direction indicator
+		 * is UNKNOWN
+		 */
+		if (us->srb->sc_data_direction == DMA_BIDIRECTIONAL) {
+			usb_stor_dbg(us, "UNKNOWN data direction\n");
+			us->srb->result = DID_ERROR << 16;
+		}
+
+		/* reject if target != 0 or if LUN is higher than
+		 * the maximum known LUN
+		 */
+		else if (us->srb->device->id &&
+				!(us->fflags & US_FL_SCM_MULT_TARG)) {
+			usb_stor_dbg(us, "Bad target number (%d:%llu)\n",
+				     us->srb->device->id,
+				     us->srb->device->lun);
+			us->srb->result = DID_BAD_TARGET << 16;
+		}
+
+		else if (us->srb->device->lun > us->max_lun) {
+			usb_stor_dbg(us, "Bad LUN (%d:%llu)\n",
+				     us->srb->device->id,
+				     us->srb->device->lun);
+			us->srb->result = DID_BAD_TARGET << 16;
+		}
+
+		/* Handle those devices which need us to fake
+		 * their inquiry data */
+		else if ((us->srb->cmnd[0] == INQUIRY) &&
+			    (us->fflags & US_FL_FIX_INQUIRY)) {
+			unsigned char data_ptr[36] = {
+			    0x00, 0x80, 0x02, 0x02,
+			    0x1F, 0x00, 0x00, 0x00};
+
+			usb_stor_dbg(us, "Faking INQUIRY command\n");
+			fill_inquiry_response(us, data_ptr, 36);
+			us->srb->result = SAM_STAT_GOOD;
+		}
+
+		/* we've got a command, let's do it! */
+		else {
+			US_DEBUG(usb_stor_show_command(us, us->srb));
+			us->proto_handler(us->srb, us);
+			usb_mark_last_busy(us->pusb_dev);
+		}
+
+		/* lock access to the state */
+		scsi_lock(host);
+
+		/* indicate that the command is done */
+		if (us->srb->result != DID_ABORT << 16) {
+			usb_stor_dbg(us, "scsi cmd done, result=0x%x\n",
+				     us->srb->result);
+			us->srb->scsi_done(us->srb);
+		} else {
+SkipForAbort:
+			usb_stor_dbg(us, "scsi command aborted\n");
+		}
+
+		/* If an abort request was received we need to signal that
+		 * the abort has finished.  The proper test for this is
+		 * the TIMED_OUT flag, not srb->result == DID_ABORT, because
+		 * the timeout might have occurred after the command had
+		 * already completed with a different result code. */
+		if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
+			complete(&(us->notify));
+
+			/* Allow USB transfers to resume */
+			clear_bit(US_FLIDX_ABORTING, &us->dflags);
+			clear_bit(US_FLIDX_TIMED_OUT, &us->dflags);
+		}
+
+		/* finished working on this command */
+		us->srb = NULL;
+		scsi_unlock(host);
+
+		/* unlock the device pointers */
+		mutex_unlock(&us->dev_mutex);
+	} /* for (;;) */
+
+	/* Wait until we are told to stop */
+	for (;;) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (kthread_should_stop())
+			break;
+		schedule();
+	}
+	__set_current_state(TASK_RUNNING);
+	return 0;
+}
+
+/***********************************************************************
+ * Device probing and disconnecting
+ ***********************************************************************/
+
+/* Associate our private data with the USB device */
+static int associate_dev(struct us_data *us, struct usb_interface *intf)
+{
+	/* Fill in the device-related fields */
+	us->pusb_dev = interface_to_usbdev(intf);
+	us->pusb_intf = intf;
+	us->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
+	usb_stor_dbg(us, "Vendor: 0x%04x, Product: 0x%04x, Revision: 0x%04x\n",
+		     le16_to_cpu(us->pusb_dev->descriptor.idVendor),
+		     le16_to_cpu(us->pusb_dev->descriptor.idProduct),
+		     le16_to_cpu(us->pusb_dev->descriptor.bcdDevice));
+	usb_stor_dbg(us, "Interface Subclass: 0x%02x, Protocol: 0x%02x\n",
+		     intf->cur_altsetting->desc.bInterfaceSubClass,
+		     intf->cur_altsetting->desc.bInterfaceProtocol);
+
+	/* Store our private data in the interface */
+	usb_set_intfdata(intf, us);
+
+	/* Allocate the control/setup and DMA-mapped buffers */
+	us->cr = kmalloc(sizeof(*us->cr), GFP_KERNEL);
+	if (!us->cr)
+		return -ENOMEM;
+
+	us->iobuf = usb_alloc_coherent(us->pusb_dev, US_IOBUF_SIZE,
+			GFP_KERNEL, &us->iobuf_dma);
+	if (!us->iobuf) {
+		usb_stor_dbg(us, "I/O buffer allocation failed\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+/* Works only for digits and letters, but small and fast */
+#define TOLOWER(x) ((x) | 0x20)
+
+/* Adjust device flags based on the "quirks=" module parameter */
+void usb_stor_adjust_quirks(struct usb_device *udev, unsigned long *fflags)
+{
+	char *p;
+	u16 vid = le16_to_cpu(udev->descriptor.idVendor);
+	u16 pid = le16_to_cpu(udev->descriptor.idProduct);
+	unsigned f = 0;
+	unsigned int mask = (US_FL_SANE_SENSE | US_FL_BAD_SENSE |
+			US_FL_FIX_CAPACITY | US_FL_IGNORE_UAS |
+			US_FL_CAPACITY_HEURISTICS | US_FL_IGNORE_DEVICE |
+			US_FL_NOT_LOCKABLE | US_FL_MAX_SECTORS_64 |
+			US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE |
+			US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT |
+			US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 |
+			US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE |
+			US_FL_NO_ATA_1X | US_FL_NO_REPORT_OPCODES |
+			US_FL_MAX_SECTORS_240);
+
+	p = quirks;
+	while (*p) {
+		/* Each entry consists of VID:PID:flags */
+		if (vid == simple_strtoul(p, &p, 16) &&
+				*p == ':' &&
+				pid == simple_strtoul(p+1, &p, 16) &&
+				*p == ':')
+			break;
+
+		/* Move forward to the next entry */
+		while (*p) {
+			if (*p++ == ',')
+				break;
+		}
+	}
+	if (!*p)	/* No match */
+		return;
+
+	/* Collect the flags */
+	while (*++p && *p != ',') {
+		switch (TOLOWER(*p)) {
+		case 'a':
+			f |= US_FL_SANE_SENSE;
+			break;
+		case 'b':
+			f |= US_FL_BAD_SENSE;
+			break;
+		case 'c':
+			f |= US_FL_FIX_CAPACITY;
+			break;
+		case 'd':
+			f |= US_FL_NO_READ_DISC_INFO;
+			break;
+		case 'e':
+			f |= US_FL_NO_READ_CAPACITY_16;
+			break;
+		case 'f':
+			f |= US_FL_NO_REPORT_OPCODES;
+			break;
+		case 'g':
+			f |= US_FL_MAX_SECTORS_240;
+			break;
+		case 'h':
+			f |= US_FL_CAPACITY_HEURISTICS;
+			break;
+		case 'i':
+			f |= US_FL_IGNORE_DEVICE;
+			break;
+		case 'l':
+			f |= US_FL_NOT_LOCKABLE;
+			break;
+		case 'm':
+			f |= US_FL_MAX_SECTORS_64;
+			break;
+		case 'n':
+			f |= US_FL_INITIAL_READ10;
+			break;
+		case 'o':
+			f |= US_FL_CAPACITY_OK;
+			break;
+		case 'p':
+			f |= US_FL_WRITE_CACHE;
+			break;
+		case 'r':
+			f |= US_FL_IGNORE_RESIDUE;
+			break;
+		case 's':
+			f |= US_FL_SINGLE_LUN;
+			break;
+		case 't':
+			f |= US_FL_NO_ATA_1X;
+			break;
+		case 'u':
+			f |= US_FL_IGNORE_UAS;
+			break;
+		case 'w':
+			f |= US_FL_NO_WP_DETECT;
+			break;
+		/* Ignore unrecognized flag characters */
+		}
+	}
+	*fflags = (*fflags & ~mask) | f;
+}
+EXPORT_SYMBOL_GPL(usb_stor_adjust_quirks);
+
+/* Get the unusual_devs entries and the string descriptors */
+static int get_device_info(struct us_data *us, const struct usb_device_id *id,
+		struct us_unusual_dev *unusual_dev)
+{
+	struct usb_device *dev = us->pusb_dev;
+	struct usb_interface_descriptor *idesc =
+		&us->pusb_intf->cur_altsetting->desc;
+	struct device *pdev = &us->pusb_intf->dev;
+
+	/* Store the entries */
+	us->unusual_dev = unusual_dev;
+	us->subclass = (unusual_dev->useProtocol == USB_SC_DEVICE) ?
+			idesc->bInterfaceSubClass :
+			unusual_dev->useProtocol;
+	us->protocol = (unusual_dev->useTransport == USB_PR_DEVICE) ?
+			idesc->bInterfaceProtocol :
+			unusual_dev->useTransport;
+	us->fflags = id->driver_info;
+	usb_stor_adjust_quirks(us->pusb_dev, &us->fflags);
+
+	if (us->fflags & US_FL_IGNORE_DEVICE) {
+		dev_info(pdev, "device ignored\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * This flag is only needed when we're in high-speed, so let's
+	 * disable it if we're in full-speed
+	 */
+	if (dev->speed != USB_SPEED_HIGH)
+		us->fflags &= ~US_FL_GO_SLOW;
+
+	if (us->fflags)
+		dev_info(pdev, "Quirks match for vid %04x pid %04x: %lx\n",
+				le16_to_cpu(dev->descriptor.idVendor),
+				le16_to_cpu(dev->descriptor.idProduct),
+				us->fflags);
+
+	/* Log a message if a non-generic unusual_dev entry contains an
+	 * unnecessary subclass or protocol override.  This may stimulate
+	 * reports from users that will help us remove unneeded entries
+	 * from the unusual_devs.h table.
+	 */
+	if (id->idVendor || id->idProduct) {
+		static const char *msgs[3] = {
+			"an unneeded SubClass entry",
+			"an unneeded Protocol entry",
+			"unneeded SubClass and Protocol entries"};
+		struct usb_device_descriptor *ddesc = &dev->descriptor;
+		int msg = -1;
+
+		if (unusual_dev->useProtocol != USB_SC_DEVICE &&
+			us->subclass == idesc->bInterfaceSubClass)
+			msg += 1;
+		if (unusual_dev->useTransport != USB_PR_DEVICE &&
+			us->protocol == idesc->bInterfaceProtocol)
+			msg += 2;
+		if (msg >= 0 && !(us->fflags & US_FL_NEED_OVERRIDE))
+			dev_notice(pdev, "This device "
+					"(%04x,%04x,%04x S %02x P %02x)"
+					" has %s in unusual_devs.h (kernel"
+					" %s)\n"
+					"   Please send a copy of this message to "
+					"<linux-usb@vger.kernel.org> and "
+					"<usb-storage@lists.one-eyed-alien.net>\n",
+					le16_to_cpu(ddesc->idVendor),
+					le16_to_cpu(ddesc->idProduct),
+					le16_to_cpu(ddesc->bcdDevice),
+					idesc->bInterfaceSubClass,
+					idesc->bInterfaceProtocol,
+					msgs[msg],
+					utsname()->release);
+	}
+
+	return 0;
+}
+
+/* Get the transport settings */
+static void get_transport(struct us_data *us)
+{
+	switch (us->protocol) {
+	case USB_PR_CB:
+		us->transport_name = "Control/Bulk";
+		us->transport = usb_stor_CB_transport;
+		us->transport_reset = usb_stor_CB_reset;
+		us->max_lun = 7;
+		break;
+
+	case USB_PR_CBI:
+		us->transport_name = "Control/Bulk/Interrupt";
+		us->transport = usb_stor_CB_transport;
+		us->transport_reset = usb_stor_CB_reset;
+		us->max_lun = 7;
+		break;
+
+	case USB_PR_BULK:
+		us->transport_name = "Bulk";
+		us->transport = usb_stor_Bulk_transport;
+		us->transport_reset = usb_stor_Bulk_reset;
+		break;
+	}
+}
+
+/* Get the protocol settings */
+static void get_protocol(struct us_data *us)
+{
+	switch (us->subclass) {
+	case USB_SC_RBC:
+		us->protocol_name = "Reduced Block Commands (RBC)";
+		us->proto_handler = usb_stor_transparent_scsi_command;
+		break;
+
+	case USB_SC_8020:
+		us->protocol_name = "8020i";
+		us->proto_handler = usb_stor_pad12_command;
+		us->max_lun = 0;
+		break;
+
+	case USB_SC_QIC:
+		us->protocol_name = "QIC-157";
+		us->proto_handler = usb_stor_pad12_command;
+		us->max_lun = 0;
+		break;
+
+	case USB_SC_8070:
+		us->protocol_name = "8070i";
+		us->proto_handler = usb_stor_pad12_command;
+		us->max_lun = 0;
+		break;
+
+	case USB_SC_SCSI:
+		us->protocol_name = "Transparent SCSI";
+		us->proto_handler = usb_stor_transparent_scsi_command;
+		break;
+
+	case USB_SC_UFI:
+		us->protocol_name = "Uniform Floppy Interface (UFI)";
+		us->proto_handler = usb_stor_ufi_command;
+		break;
+	}
+}
+
+/* Get the pipe settings */
+static int get_pipes(struct us_data *us)
+{
+	struct usb_host_interface *altsetting =
+		us->pusb_intf->cur_altsetting;
+	int i;
+	struct usb_endpoint_descriptor *ep;
+	struct usb_endpoint_descriptor *ep_in = NULL;
+	struct usb_endpoint_descriptor *ep_out = NULL;
+	struct usb_endpoint_descriptor *ep_int = NULL;
+
+	/*
+	 * Find the first endpoint of each type we need.
+	 * We are expecting a minimum of 2 endpoints - in and out (bulk).
+	 * An optional interrupt-in is OK (necessary for CBI protocol).
+	 * We will ignore any others.
+	 */
+	for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
+		ep = &altsetting->endpoint[i].desc;
+
+		if (usb_endpoint_xfer_bulk(ep)) {
+			if (usb_endpoint_dir_in(ep)) {
+				if (!ep_in)
+					ep_in = ep;
+			} else {
+				if (!ep_out)
+					ep_out = ep;
+			}
+		}
+
+		else if (usb_endpoint_is_int_in(ep)) {
+			if (!ep_int)
+				ep_int = ep;
+		}
+	}
+
+	if (!ep_in || !ep_out || (us->protocol == USB_PR_CBI && !ep_int)) {
+		usb_stor_dbg(us, "Endpoint sanity check failed! Rejecting dev.\n");
+		return -EIO;
+	}
+
+	/* Calculate and store the pipe values */
+	us->send_ctrl_pipe = usb_sndctrlpipe(us->pusb_dev, 0);
+	us->recv_ctrl_pipe = usb_rcvctrlpipe(us->pusb_dev, 0);
+	us->send_bulk_pipe = usb_sndbulkpipe(us->pusb_dev,
+		usb_endpoint_num(ep_out));
+	us->recv_bulk_pipe = usb_rcvbulkpipe(us->pusb_dev,
+		usb_endpoint_num(ep_in));
+	if (ep_int) {
+		us->recv_intr_pipe = usb_rcvintpipe(us->pusb_dev,
+			usb_endpoint_num(ep_int));
+		us->ep_bInterval = ep_int->bInterval;
+	}
+	return 0;
+}
+
+/* Initialize all the dynamic resources we need */
+static int usb_stor_acquire_resources(struct us_data *us)
+{
+	int p;
+	struct task_struct *th;
+
+	us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!us->current_urb) {
+		usb_stor_dbg(us, "URB allocation failed\n");
+		return -ENOMEM;
+	}
+
+	/* Just before we start our control thread, initialize
+	 * the device if it needs initialization */
+	if (us->unusual_dev->initFunction) {
+		p = us->unusual_dev->initFunction(us);
+		if (p)
+			return p;
+	}
+
+	/* Start up our control thread */
+	th = kthread_run(usb_stor_control_thread, us, "usb-storage");
+	if (IS_ERR(th)) {
+		dev_warn(&us->pusb_intf->dev,
+				"Unable to start control thread\n");
+		return PTR_ERR(th);
+	}
+	us->ctl_thread = th;
+
+	return 0;
+}
+
+/* Release all our dynamic resources */
+static void usb_stor_release_resources(struct us_data *us)
+{
+	/* Tell the control thread to exit.  The SCSI host must
+	 * already have been removed and the DISCONNECTING flag set
+	 * so that we won't accept any more commands.
+	 */
+	usb_stor_dbg(us, "-- sending exit command to thread\n");
+	complete(&us->cmnd_ready);
+	if (us->ctl_thread)
+		kthread_stop(us->ctl_thread);
+
+	/* Call the destructor routine, if it exists */
+	if (us->extra_destructor) {
+		usb_stor_dbg(us, "-- calling extra_destructor()\n");
+		us->extra_destructor(us->extra);
+	}
+
+	/* Free the extra data and the URB */
+	kfree(us->extra);
+	usb_free_urb(us->current_urb);
+}
+
+/* Dissociate from the USB device */
+static void dissociate_dev(struct us_data *us)
+{
+	/* Free the buffers */
+	kfree(us->cr);
+	usb_free_coherent(us->pusb_dev, US_IOBUF_SIZE, us->iobuf, us->iobuf_dma);
+
+	/* Remove our private data from the interface */
+	usb_set_intfdata(us->pusb_intf, NULL);
+}
+
+/* First stage of disconnect processing: stop SCSI scanning,
+ * remove the host, and stop accepting new commands
+ */
+static void quiesce_and_remove_host(struct us_data *us)
+{
+	struct Scsi_Host *host = us_to_host(us);
+
+	/* If the device is really gone, cut short reset delays */
+	if (us->pusb_dev->state == USB_STATE_NOTATTACHED) {
+		set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
+		wake_up(&us->delay_wait);
+	}
+
+	/* Prevent SCSI scanning (if it hasn't started yet)
+	 * or wait for the SCSI-scanning routine to stop.
+	 */
+	cancel_delayed_work_sync(&us->scan_dwork);
+
+	/* Balance autopm calls if scanning was cancelled */
+	if (test_bit(US_FLIDX_SCAN_PENDING, &us->dflags))
+		usb_autopm_put_interface_no_suspend(us->pusb_intf);
+
+	/* Removing the host will perform an orderly shutdown: caches
+	 * synchronized, disks spun down, etc.
+	 */
+	scsi_remove_host(host);
+
+	/* Prevent any new commands from being accepted and cut short
+	 * reset delays.
+	 */
+	scsi_lock(host);
+	set_bit(US_FLIDX_DISCONNECTING, &us->dflags);
+	scsi_unlock(host);
+	wake_up(&us->delay_wait);
+}
+
+/* Second stage of disconnect processing: deallocate all resources */
+static void release_everything(struct us_data *us)
+{
+	usb_stor_release_resources(us);
+	dissociate_dev(us);
+
+	/* Drop our reference to the host; the SCSI core will free it
+	 * (and "us" along with it) when the refcount becomes 0. */
+	scsi_host_put(us_to_host(us));
+}
+
+/* Delayed-work routine to carry out SCSI-device scanning */
+static void usb_stor_scan_dwork(struct work_struct *work)
+{
+	struct us_data *us = container_of(work, struct us_data,
+			scan_dwork.work);
+	struct device *dev = &us->pusb_intf->dev;
+
+	dev_dbg(dev, "starting scan\n");
+
+	/* For bulk-only devices, determine the max LUN value */
+	if (us->protocol == USB_PR_BULK &&
+	    !(us->fflags & US_FL_SINGLE_LUN) &&
+	    !(us->fflags & US_FL_SCM_MULT_TARG)) {
+		mutex_lock(&us->dev_mutex);
+		us->max_lun = usb_stor_Bulk_max_lun(us);
+		/*
+		 * Allow proper scanning of devices that present more than 8 LUNs
+		 * While not affecting other devices that may need the previous behavior
+		 */
+		if (us->max_lun >= 8)
+			us_to_host(us)->max_lun = us->max_lun+1;
+		mutex_unlock(&us->dev_mutex);
+	}
+	scsi_scan_host(us_to_host(us));
+	dev_dbg(dev, "scan complete\n");
+
+	/* Should we unbind if no devices were detected? */
+
+	usb_autopm_put_interface(us->pusb_intf);
+	clear_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
+}
+
+static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
+{
+	struct usb_device *usb_dev = interface_to_usbdev(intf);
+
+	if (usb_dev->bus->sg_tablesize) {
+		return usb_dev->bus->sg_tablesize;
+	}
+	return SG_ALL;
+}
+
+/* First part of general USB mass-storage probing */
+int usb_stor_probe1(struct us_data **pus,
+		struct usb_interface *intf,
+		const struct usb_device_id *id,
+		struct us_unusual_dev *unusual_dev)
+{
+	struct Scsi_Host *host;
+	struct us_data *us;
+	int result;
+
+	dev_info(&intf->dev, "USB Mass Storage device detected\n");
+
+	/*
+	 * Ask the SCSI layer to allocate a host structure, with extra
+	 * space at the end for our private us_data structure.
+	 */
+	host = scsi_host_alloc(&usb_stor_host_template, sizeof(*us));
+	if (!host) {
+		dev_warn(&intf->dev, "Unable to allocate the scsi host\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * Allow 16-byte CDBs and thus > 2TB
+	 */
+	host->max_cmd_len = 16;
+	host->sg_tablesize = usb_stor_sg_tablesize(intf);
+	*pus = us = host_to_us(host);
+	mutex_init(&(us->dev_mutex));
+	us_set_lock_class(&us->dev_mutex, intf);
+	init_completion(&us->cmnd_ready);
+	init_completion(&(us->notify));
+	init_waitqueue_head(&us->delay_wait);
+	INIT_DELAYED_WORK(&us->scan_dwork, usb_stor_scan_dwork);
+
+	/* Associate the us_data structure with the USB device */
+	result = associate_dev(us, intf);
+	if (result)
+		goto BadDevice;
+
+	/* Get the unusual_devs entries and the descriptors */
+	result = get_device_info(us, id, unusual_dev);
+	if (result)
+		goto BadDevice;
+
+	/* Get standard transport and protocol settings */
+	get_transport(us);
+	get_protocol(us);
+
+	/* Give the caller a chance to fill in specialized transport
+	 * or protocol settings.
+	 */
+	return 0;
+
+BadDevice:
+	usb_stor_dbg(us, "storage_probe() failed\n");
+	release_everything(us);
+	return result;
+}
+EXPORT_SYMBOL_GPL(usb_stor_probe1);
+
+/* Second part of general USB mass-storage probing */
+int usb_stor_probe2(struct us_data *us)
+{
+	int result;
+	struct device *dev = &us->pusb_intf->dev;
+
+	/* Make sure the transport and protocol have both been set */
+	if (!us->transport || !us->proto_handler) {
+		result = -ENXIO;
+		goto BadDevice;
+	}
+	usb_stor_dbg(us, "Transport: %s\n", us->transport_name);
+	usb_stor_dbg(us, "Protocol: %s\n", us->protocol_name);
+
+	if (us->fflags & US_FL_SCM_MULT_TARG) {
+		/*
+		 * SCM eUSCSI bridge devices can have different numbers
+		 * of LUNs on different targets; allow all to be probed.
+		 */
+		us->max_lun = 7;
+		/* The eUSCSI itself has ID 7, so avoid scanning that */
+		us_to_host(us)->this_id = 7;
+		/* max_id is 8 initially, so no need to set it here */
+	} else {
+		/* In the normal case there is only a single target */
+		us_to_host(us)->max_id = 1;
+		/*
+		 * Like Windows, we won't store the LUN bits in CDB[1] for
+		 * SCSI-2 devices using the Bulk-Only transport (even though
+		 * this violates the SCSI spec).
+		 */
+		if (us->transport == usb_stor_Bulk_transport)
+			us_to_host(us)->no_scsi2_lun_in_cdb = 1;
+	}
+
+	/* fix for single-lun devices */
+	if (us->fflags & US_FL_SINGLE_LUN)
+		us->max_lun = 0;
+
+	/* Find the endpoints and calculate pipe values */
+	result = get_pipes(us);
+	if (result)
+		goto BadDevice;
+
+	/*
+	 * If the device returns invalid data for the first READ(10)
+	 * command, indicate the command should be retried.
+	 */
+	if (us->fflags & US_FL_INITIAL_READ10)
+		set_bit(US_FLIDX_REDO_READ10, &us->dflags);
+
+	/* Acquire all the other resources and add the host */
+	result = usb_stor_acquire_resources(us);
+	if (result)
+		goto BadDevice;
+	snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
+					dev_name(&us->pusb_intf->dev));
+	result = scsi_add_host(us_to_host(us), dev);
+	if (result) {
+		dev_warn(dev,
+				"Unable to add the scsi host\n");
+		goto BadDevice;
+	}
+
+	/* Submit the delayed_work for SCSI-device scanning */
+	usb_autopm_get_interface_no_resume(us->pusb_intf);
+	set_bit(US_FLIDX_SCAN_PENDING, &us->dflags);
+
+	if (delay_use > 0)
+		dev_dbg(dev, "waiting for device to settle before scanning\n");
+	queue_delayed_work(system_freezable_wq, &us->scan_dwork,
+			delay_use * HZ);
+	return 0;
+
+	/* We come here if there are any problems */
+BadDevice:
+	usb_stor_dbg(us, "storage_probe() failed\n");
+	release_everything(us);
+	return result;
+}
+EXPORT_SYMBOL_GPL(usb_stor_probe2);
+
+/* Handle a USB mass-storage disconnect */
+void usb_stor_disconnect(struct usb_interface *intf)
+{
+	struct us_data *us = usb_get_intfdata(intf);
+
+	quiesce_and_remove_host(us);
+	release_everything(us);
+}
+EXPORT_SYMBOL_GPL(usb_stor_disconnect);
+
+/* The main probe routine for standard devices */
+static int storage_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	struct us_unusual_dev *unusual_dev;
+	struct us_data *us;
+	int result;
+	int size;
+
+	/* If uas is enabled and this device can do uas then ignore it. */
+#if IS_ENABLED(CONFIG_USB_UAS)
+	if (uas_use_uas_driver(intf, id, NULL))
+		return -ENXIO;
+#endif
+
+	/*
+	 * If the device isn't standard (is handled by a subdriver
+	 * module) then don't accept it.
+	 */
+	if (usb_usual_ignore_device(intf))
+		return -ENXIO;
+
+	/*
+	 * Call the general probe procedures.
+	 *
+	 * The unusual_dev_list array is parallel to the usb_storage_usb_ids
+	 * table, so we use the index of the id entry to find the
+	 * corresponding unusual_devs entry.
+	 */
+
+	size = ARRAY_SIZE(us_unusual_dev_list);
+	if (id >= usb_storage_usb_ids && id < usb_storage_usb_ids + size) {
+		unusual_dev = (id - usb_storage_usb_ids) + us_unusual_dev_list;
+	} else {
+		unusual_dev = &for_dynamic_ids;
+
+		dev_dbg(&intf->dev, "Use Bulk-Only transport with the Transparent SCSI protocol for dynamic id: 0x%04x 0x%04x\n",
+			id->idVendor, id->idProduct);
+	}
+
+	result = usb_stor_probe1(&us, intf, id, unusual_dev);
+	if (result)
+		return result;
+
+	/* No special transport or protocol settings in the main module */
+
+	result = usb_stor_probe2(us);
+	return result;
+}
+
+static struct usb_driver usb_storage_driver = {
+	.name =		"usb-storage",
+	.probe =	storage_probe,
+	.disconnect =	usb_stor_disconnect,
+	.suspend =	usb_stor_suspend,
+	.resume =	usb_stor_resume,
+	.reset_resume =	usb_stor_reset_resume,
+	.pre_reset =	usb_stor_pre_reset,
+	.post_reset =	usb_stor_post_reset,
+	.id_table =	usb_storage_usb_ids,
+	.supports_autosuspend = 1,
+	.soft_unbind =	1,
+};
+
+module_usb_driver(usb_storage_driver);