Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

5 files changed, 1938 insertions, 0 deletions

diff --git a/drivers/usb/image/Kconfig b/drivers/usb/image/Kconfig
new file mode 100644
index 000000000..a65c638e7
--- /dev/null
+++ b/drivers/usb/image/Kconfig
@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# USB Imaging devices configuration
+#
+comment "USB Imaging devices"
+
+config USB_MDC800
+	tristate "USB Mustek MDC800 Digital Camera support"
+	help
+	  Say Y here if you want to connect this type of still camera to
+	  your computer's USB port. This driver can be used with gphoto 0.4.3
+	  and higher (look at <http://www.gphoto.org/>).
+	  To use it create a device node with "mknod /dev/mustek c 180 32" and
+	  configure it in your software.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called mdc800.
+
+config USB_MICROTEK
+	tristate "Microtek X6USB scanner support"
+	depends on SCSI
+	help
+	  Say Y here if you want support for the Microtek X6USB and
+	  possibly the Phantom 336CX, Phantom C6 and ScanMaker V6U(S)L.
+	  Support for anything but the X6 is experimental.
+	  Please report failures and successes.
+	  The scanner will appear as a scsi generic device to the rest
+	  of the system. Scsi support is required.
+	  This driver can be compiled as a module, called microtek.
diff --git a/drivers/usb/image/Makefile b/drivers/usb/image/Makefile
new file mode 100644
index 000000000..8997c81ba
--- /dev/null
+++ b/drivers/usb/image/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for USB Image drivers
+#
+
+obj-$(CONFIG_USB_MDC800)	+= mdc800.o
+obj-$(CONFIG_USB_MICROTEK)	+= microtek.o
diff --git a/drivers/usb/image/mdc800.c b/drivers/usb/image/mdc800.c
new file mode 100644
index 000000000..f7caa1c5c
--- /dev/null
+++ b/drivers/usb/image/mdc800.c
@@ -0,0 +1,1078 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * copyright (C) 1999/2000 by Henning Zabel <henning@uni-paderborn.de>
+ */
+
+
+/*
+ *	USB-Kernel Driver for the Mustek MDC800 Digital Camera
+ *	(c) 1999/2000 Henning Zabel <henning@uni-paderborn.de>
+ *
+ *
+ * The driver brings the USB functions of the MDC800 to Linux.
+ * To use the Camera you must support the USB Protocol of the camera
+ * to the Kernel Node.
+ * The Driver uses a misc device Node. Create it with :
+ * mknod /dev/mustek c 180 32
+ *
+ * The driver supports only one camera.
+ * 
+ * Fix: mdc800 used sleep_on and slept with io_lock held.
+ * Converted sleep_on to waitqueues with schedule_timeout and made io_lock
+ * a semaphore from a spinlock.
+ * by Oliver Neukum <oliver@neukum.name>
+ * (02/12/2001)
+ * 
+ * Identify version on module load.
+ * (08/04/2001) gb
+ *
+ * version 0.7.5
+ * Fixed potential SMP races with Spinlocks.
+ * Thanks to Oliver Neukum <oliver@neukum.name> who 
+ * noticed the race conditions.
+ * (30/10/2000)
+ *
+ * Fixed: Setting urb->dev before submitting urb.
+ * by Greg KH <greg@kroah.com>
+ * (13/10/2000)
+ *
+ * version 0.7.3
+ * bugfix : The mdc800->state field gets set to READY after the
+ * disconnect function sets it to NOT_CONNECTED. This makes the
+ * driver running like the camera is connected and causes some
+ * hang ups.
+ *
+ * version 0.7.1
+ * MOD_INC and MOD_DEC are changed in usb_probe to prevent load/unload
+ * problems when compiled as Module.
+ * (04/04/2000)
+ *
+ * The mdc800 driver gets assigned the USB Minor 32-47. The Registration
+ * was updated to use these values.
+ * (26/03/2000)
+ *
+ * The Init und Exit Module Function are updated.
+ * (01/03/2000)
+ *
+ * version 0.7.0
+ * Rewrite of the driver : The driver now uses URB's. The old stuff
+ * has been removed.
+ *
+ * version 0.6.0
+ * Rewrite of this driver: The Emulation of the rs232 protocoll
+ * has been removed from the driver. A special executeCommand function
+ * for this driver is included to gphoto.
+ * The driver supports two kind of communication to bulk endpoints.
+ * Either with the dev->bus->ops->bulk... or with callback function.
+ * (09/11/1999)
+ *
+ * version 0.5.0:
+ * first Version that gets a version number. Most of the needed
+ * functions work.
+ * (20/10/1999)
+ */
+
+#include <linux/sched/signal.h>
+#include <linux/signal.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/random.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/wait.h>
+#include <linux/mutex.h>
+
+#include <linux/usb.h>
+#include <linux/fs.h>
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v0.7.5 (30/10/2000)"
+#define DRIVER_AUTHOR "Henning Zabel <henning@uni-paderborn.de>"
+#define DRIVER_DESC "USB Driver for Mustek MDC800 Digital Camera"
+
+/* Vendor and Product Information */
+#define MDC800_VENDOR_ID 	0x055f
+#define MDC800_PRODUCT_ID	0xa800
+
+/* Timeouts (msec) */
+#define TO_DOWNLOAD_GET_READY		1500
+#define TO_DOWNLOAD_GET_BUSY		1500
+#define TO_WRITE_GET_READY		1000
+#define TO_DEFAULT_COMMAND		5000
+#define TO_READ_FROM_IRQ 		TO_DEFAULT_COMMAND
+#define TO_GET_READY			TO_DEFAULT_COMMAND
+
+/* Minor Number of the device (create with mknod /dev/mustek c 180 32) */
+#define MDC800_DEVICE_MINOR_BASE 32
+
+
+/**************************************************************************
+	Data and structs
+***************************************************************************/
+
+
+typedef enum {
+	NOT_CONNECTED, READY, WORKING, DOWNLOAD
+} mdc800_state;
+
+
+/* Data for the driver */
+struct mdc800_data
+{
+	struct usb_device *	dev;			// Device Data
+	mdc800_state 		state;
+
+	unsigned int		endpoint [4];
+
+	struct urb *		irq_urb;
+	wait_queue_head_t	irq_wait;
+	int			irq_woken;
+	char*			irq_urb_buffer;
+
+	int			camera_busy;          // is camera busy ?
+	int 			camera_request_ready; // Status to synchronize with irq
+	char 			camera_response [8];  // last Bytes send after busy
+
+	struct urb *   		write_urb;
+	char*			write_urb_buffer;
+	wait_queue_head_t	write_wait;
+	int			written;
+
+
+	struct urb *   		download_urb;
+	char*			download_urb_buffer;
+	wait_queue_head_t	download_wait;
+	int			downloaded;
+	int			download_left;		// Bytes left to download ?
+
+
+	/* Device Data */
+	char			out [64];	// Answer Buffer
+	int 			out_ptr;	// Index to the first not readen byte
+	int			out_count;	// Bytes in the buffer
+
+	int			open;		// Camera device open ?
+	struct mutex		io_lock;	// IO -lock
+
+	char 			in [8];		// Command Input Buffer
+	int  			in_count;
+
+	int			pic_index;	// Cache for the Imagesize (-1 for nothing cached )
+	int			pic_len;
+	int			minor;
+};
+
+
+/* Specification of the Endpoints */
+static struct usb_endpoint_descriptor mdc800_ed [4] =
+{
+	{ 
+		.bLength = 		0,
+		.bDescriptorType =	0,
+		.bEndpointAddress =	0x01,
+		.bmAttributes = 	0x02,
+		.wMaxPacketSize =	cpu_to_le16(8),
+		.bInterval = 		0,
+		.bRefresh = 		0,
+		.bSynchAddress = 	0,
+	},
+	{
+		.bLength = 		0,
+		.bDescriptorType = 	0,
+		.bEndpointAddress = 	0x82,
+		.bmAttributes = 	0x03,
+		.wMaxPacketSize = 	cpu_to_le16(8),
+		.bInterval = 		0,
+		.bRefresh = 		0,
+		.bSynchAddress = 	0,
+	},
+	{
+		.bLength = 		0,
+		.bDescriptorType = 	0,
+		.bEndpointAddress = 	0x03,
+		.bmAttributes = 	0x02,
+		.wMaxPacketSize = 	cpu_to_le16(64),
+		.bInterval = 		0,
+		.bRefresh = 		0,
+		.bSynchAddress = 	0,
+	},
+	{
+		.bLength = 		0,
+		.bDescriptorType = 	0,
+		.bEndpointAddress = 	0x84,
+		.bmAttributes = 	0x02,
+		.wMaxPacketSize = 	cpu_to_le16(64),
+		.bInterval = 		0,
+		.bRefresh = 		0,
+		.bSynchAddress = 	0,
+	},
+};
+
+/* The Variable used by the driver */
+static struct mdc800_data* mdc800;
+
+
+/***************************************************************************
+	The USB Part of the driver
+****************************************************************************/
+
+static int mdc800_endpoint_equals (struct usb_endpoint_descriptor *a,struct usb_endpoint_descriptor *b)
+{
+	return (
+		   ( a->bEndpointAddress == b->bEndpointAddress )
+		&& ( a->bmAttributes     == b->bmAttributes     )
+		&& ( a->wMaxPacketSize   == b->wMaxPacketSize   )
+	);
+}
+
+
+/*
+ * Checks whether the camera responds busy
+ */
+static int mdc800_isBusy (char* ch)
+{
+	int i=0;
+	while (i<8)
+	{
+		if (ch [i] != (char)0x99)
+			return 0;
+		i++;
+	}
+	return 1;
+}
+
+
+/*
+ * Checks whether the Camera is ready
+ */
+static int mdc800_isReady (char *ch)
+{
+	int i=0;
+	while (i<8)
+	{
+		if (ch [i] != (char)0xbb)
+			return 0;
+		i++;
+	}
+	return 1;
+}
+
+
+
+/*
+ * USB IRQ Handler for InputLine
+ */
+static void mdc800_usb_irq (struct urb *urb)
+{
+	int data_received=0, wake_up;
+	unsigned char* b=urb->transfer_buffer;
+	struct mdc800_data* mdc800=urb->context;
+	struct device *dev = &mdc800->dev->dev;
+	int status = urb->status;
+
+	if (status >= 0) {
+		if (mdc800_isBusy (b))
+		{
+			if (!mdc800->camera_busy)
+			{
+				mdc800->camera_busy=1;
+				dev_dbg(dev, "gets busy\n");
+			}
+		}
+		else
+		{
+			if (mdc800->camera_busy && mdc800_isReady (b))
+			{
+				mdc800->camera_busy=0;
+				dev_dbg(dev, "gets ready\n");
+			}
+		}
+		if (!(mdc800_isBusy (b) || mdc800_isReady (b)))
+		{
+			/* Store Data in camera_answer field */
+			dev_dbg(dev, "%i %i %i %i %i %i %i %i \n",b[0],b[1],b[2],b[3],b[4],b[5],b[6],b[7]);
+
+			memcpy (mdc800->camera_response,b,8);
+			data_received=1;
+		}
+	}
+	wake_up= ( mdc800->camera_request_ready > 0 )
+		&&
+		(
+			((mdc800->camera_request_ready == 1) && (!mdc800->camera_busy))
+		||
+			((mdc800->camera_request_ready == 2) && data_received)
+		||
+			((mdc800->camera_request_ready == 3) && (mdc800->camera_busy))
+		||
+			(status < 0)
+		);
+
+	if (wake_up)
+	{
+		mdc800->camera_request_ready=0;
+		mdc800->irq_woken=1;
+		wake_up (&mdc800->irq_wait);
+	}
+}
+
+
+/*
+ * Waits a while until the irq responds that camera is ready
+ *
+ *  mode : 0: Wait for camera gets ready
+ *         1: Wait for receiving data
+ *         2: Wait for camera gets busy
+ *
+ * msec: Time to wait
+ */
+static int mdc800_usb_waitForIRQ (int mode, int msec)
+{
+	mdc800->camera_request_ready=1+mode;
+
+	wait_event_timeout(mdc800->irq_wait, mdc800->irq_woken,
+			   msecs_to_jiffies(msec));
+	mdc800->irq_woken = 0;
+
+	if (mdc800->camera_request_ready>0)
+	{
+		mdc800->camera_request_ready=0;
+		dev_err(&mdc800->dev->dev, "timeout waiting for camera.\n");
+		return -1;
+	}
+	
+	if (mdc800->state == NOT_CONNECTED)
+	{
+		printk(KERN_WARNING "mdc800: Camera gets disconnected "
+		       "during waiting for irq.\n");
+		mdc800->camera_request_ready=0;
+		return -2;
+	}
+	
+	return 0;
+}
+
+
+/*
+ * The write_urb callback function
+ */
+static void mdc800_usb_write_notify (struct urb *urb)
+{
+	struct mdc800_data* mdc800=urb->context;
+	int status = urb->status;
+
+	if (status != 0)
+		dev_err(&mdc800->dev->dev,
+			"writing command fails (status=%i)\n", status);
+	else
+		mdc800->state=READY;
+	mdc800->written = 1;
+	wake_up (&mdc800->write_wait);
+}
+
+
+/*
+ * The download_urb callback function
+ */
+static void mdc800_usb_download_notify (struct urb *urb)
+{
+	struct mdc800_data* mdc800=urb->context;
+	int status = urb->status;
+
+	if (status == 0) {
+		/* Fill output buffer with these data */
+		memcpy (mdc800->out,  urb->transfer_buffer, 64);
+		mdc800->out_count=64;
+		mdc800->out_ptr=0;
+		mdc800->download_left-=64;
+		if (mdc800->download_left == 0)
+		{
+			mdc800->state=READY;
+		}
+	} else {
+		dev_err(&mdc800->dev->dev,
+			"request bytes fails (status:%i)\n", status);
+	}
+	mdc800->downloaded = 1;
+	wake_up (&mdc800->download_wait);
+}
+
+
+/***************************************************************************
+	Probing for the Camera
+ ***************************************************************************/
+
+static struct usb_driver mdc800_usb_driver;
+static const struct file_operations mdc800_device_ops;
+static struct usb_class_driver mdc800_class = {
+	.name =		"mdc800%d",
+	.fops =		&mdc800_device_ops,
+	.minor_base =	MDC800_DEVICE_MINOR_BASE,
+};
+
+
+/*
+ * Callback to search the Mustek MDC800 on the USB Bus
+ */
+static int mdc800_usb_probe (struct usb_interface *intf,
+			       const struct usb_device_id *id)
+{
+	int i,j;
+	struct usb_host_interface *intf_desc;
+	struct usb_device *dev = interface_to_usbdev (intf);
+	int irq_interval=0;
+	int retval;
+
+	dev_dbg(&intf->dev, "(%s) called.\n", __func__);
+
+
+	if (mdc800->dev != NULL)
+	{
+		dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n");
+		return -ENODEV;
+	}
+
+	if (dev->descriptor.bNumConfigurations != 1)
+	{
+		dev_err(&intf->dev,
+			"probe fails -> wrong Number of Configuration\n");
+		return -ENODEV;
+	}
+	intf_desc = intf->cur_altsetting;
+
+	if (
+			( intf_desc->desc.bInterfaceClass != 0xff )
+		||	( intf_desc->desc.bInterfaceSubClass != 0 )
+		|| ( intf_desc->desc.bInterfaceProtocol != 0 )
+		|| ( intf_desc->desc.bNumEndpoints != 4)
+	)
+	{
+		dev_err(&intf->dev, "probe fails -> wrong Interface\n");
+		return -ENODEV;
+	}
+
+	/* Check the Endpoints */
+	for (i=0; i<4; i++)
+	{
+		mdc800->endpoint[i]=-1;
+		for (j=0; j<4; j++)
+		{
+			if (mdc800_endpoint_equals (&intf_desc->endpoint [j].desc,&mdc800_ed [i]))
+			{
+				mdc800->endpoint[i]=intf_desc->endpoint [j].desc.bEndpointAddress ;
+				if (i==1)
+				{
+					irq_interval=intf_desc->endpoint [j].desc.bInterval;
+				}
+			}
+		}
+		if (mdc800->endpoint[i] == -1)
+		{
+			dev_err(&intf->dev, "probe fails -> Wrong Endpoints.\n");
+			return -ENODEV;
+		}
+	}
+
+
+	dev_info(&intf->dev, "Found Mustek MDC800 on USB.\n");
+
+	mutex_lock(&mdc800->io_lock);
+
+	retval = usb_register_dev(intf, &mdc800_class);
+	if (retval) {
+		dev_err(&intf->dev, "Not able to get a minor for this device.\n");
+		mutex_unlock(&mdc800->io_lock);
+		return -ENODEV;
+	}
+
+	mdc800->dev=dev;
+	mdc800->open=0;
+
+	/* Setup URB Structs */
+	usb_fill_int_urb (
+		mdc800->irq_urb,
+		mdc800->dev,
+		usb_rcvintpipe (mdc800->dev,mdc800->endpoint [1]),
+		mdc800->irq_urb_buffer,
+		8,
+		mdc800_usb_irq,
+		mdc800,
+		irq_interval
+	);
+
+	usb_fill_bulk_urb (
+		mdc800->write_urb,
+		mdc800->dev,
+		usb_sndbulkpipe (mdc800->dev, mdc800->endpoint[0]),
+		mdc800->write_urb_buffer,
+		8,
+		mdc800_usb_write_notify,
+		mdc800
+	);
+
+	usb_fill_bulk_urb (
+		mdc800->download_urb,
+		mdc800->dev,
+		usb_rcvbulkpipe (mdc800->dev, mdc800->endpoint [3]),
+		mdc800->download_urb_buffer,
+		64,
+		mdc800_usb_download_notify,
+		mdc800
+	);
+
+	mdc800->state=READY;
+
+	mutex_unlock(&mdc800->io_lock);
+	
+	usb_set_intfdata(intf, mdc800);
+	return 0;
+}
+
+
+/*
+ * Disconnect USB device (maybe the MDC800)
+ */
+static void mdc800_usb_disconnect (struct usb_interface *intf)
+{
+	struct mdc800_data* mdc800 = usb_get_intfdata(intf);
+
+	dev_dbg(&intf->dev, "(%s) called\n", __func__);
+
+	if (mdc800) {
+		if (mdc800->state == NOT_CONNECTED)
+			return;
+
+		usb_deregister_dev(intf, &mdc800_class);
+
+		/* must be under lock to make sure no URB
+		   is submitted after usb_kill_urb() */
+		mutex_lock(&mdc800->io_lock);
+		mdc800->state=NOT_CONNECTED;
+
+		usb_kill_urb(mdc800->irq_urb);
+		usb_kill_urb(mdc800->write_urb);
+		usb_kill_urb(mdc800->download_urb);
+		mutex_unlock(&mdc800->io_lock);
+
+		mdc800->dev = NULL;
+		usb_set_intfdata(intf, NULL);
+	}
+	dev_info(&intf->dev, "Mustek MDC800 disconnected from USB.\n");
+}
+
+
+/***************************************************************************
+	The Misc device Part (file_operations)
+****************************************************************************/
+
+/*
+ * This Function calc the Answersize for a command.
+ */
+static int mdc800_getAnswerSize (char command)
+{
+	switch ((unsigned char) command)
+	{
+		case 0x2a:
+		case 0x49:
+		case 0x51:
+		case 0x0d:
+		case 0x20:
+		case 0x07:
+		case 0x01:
+		case 0x25:
+		case 0x00:
+			return 8;
+
+		case 0x05:
+		case 0x3e:
+			return mdc800->pic_len;
+
+		case 0x09:
+			return 4096;
+
+		default:
+			return 0;
+	}
+}
+
+
+/*
+ * Init the device: (1) alloc mem (2) Increase MOD Count ..
+ */
+static int mdc800_device_open (struct inode* inode, struct file *file)
+{
+	int retval=0;
+	int errn=0;
+
+	mutex_lock(&mdc800->io_lock);
+	
+	if (mdc800->state == NOT_CONNECTED)
+	{
+		errn=-EBUSY;
+		goto error_out;
+	}
+	if (mdc800->open)
+	{
+		errn=-EBUSY;
+		goto error_out;
+	}
+
+	mdc800->in_count=0;
+	mdc800->out_count=0;
+	mdc800->out_ptr=0;
+	mdc800->pic_index=0;
+	mdc800->pic_len=-1;
+	mdc800->download_left=0;
+
+	mdc800->camera_busy=0;
+	mdc800->camera_request_ready=0;
+
+	mdc800->irq_urb->dev = mdc800->dev;
+	retval = usb_submit_urb (mdc800->irq_urb, GFP_KERNEL);
+	if (retval) {
+		dev_err(&mdc800->dev->dev,
+			"request USB irq fails (submit_retval=%i).\n", retval);
+		errn = -EIO;
+		goto error_out;
+	}
+
+	mdc800->open=1;
+	dev_dbg(&mdc800->dev->dev, "Mustek MDC800 device opened.\n");
+
+error_out:
+	mutex_unlock(&mdc800->io_lock);
+	return errn;
+}
+
+
+/*
+ * Close the Camera and release Memory
+ */
+static int mdc800_device_release (struct inode* inode, struct file *file)
+{
+	int retval=0;
+
+	mutex_lock(&mdc800->io_lock);
+	if (mdc800->open && (mdc800->state != NOT_CONNECTED))
+	{
+		usb_kill_urb(mdc800->irq_urb);
+		usb_kill_urb(mdc800->write_urb);
+		usb_kill_urb(mdc800->download_urb);
+		mdc800->open=0;
+	}
+	else
+	{
+		retval=-EIO;
+	}
+
+	mutex_unlock(&mdc800->io_lock);
+	return retval;
+}
+
+
+/*
+ * The Device read callback Function
+ */
+static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t len, loff_t *pos)
+{
+	size_t left=len, sts=len; /* single transfer size */
+	char __user *ptr = buf;
+	int retval;
+
+	mutex_lock(&mdc800->io_lock);
+	if (mdc800->state == NOT_CONNECTED)
+	{
+		mutex_unlock(&mdc800->io_lock);
+		return -EBUSY;
+	}
+	if (mdc800->state == WORKING)
+	{
+		printk(KERN_WARNING "mdc800: Illegal State \"working\""
+		       "reached during read ?!\n");
+		mutex_unlock(&mdc800->io_lock);
+		return -EBUSY;
+	}
+	if (!mdc800->open)
+	{
+		mutex_unlock(&mdc800->io_lock);
+		return -EBUSY;
+	}
+
+	while (left)
+	{
+		if (signal_pending (current)) 
+		{
+			mutex_unlock(&mdc800->io_lock);
+			return len == left ? -EINTR : len-left;
+		}
+
+		sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;
+
+		if (sts <= 0)
+		{
+			/* Too less Data in buffer */
+			if (mdc800->state == DOWNLOAD)
+			{
+				mdc800->out_count=0;
+				mdc800->out_ptr=0;
+
+				/* Download -> Request new bytes */
+				mdc800->download_urb->dev = mdc800->dev;
+				retval = usb_submit_urb (mdc800->download_urb, GFP_KERNEL);
+				if (retval) {
+					dev_err(&mdc800->dev->dev,
+						"Can't submit download urb "
+						"(retval=%i)\n", retval);
+					mutex_unlock(&mdc800->io_lock);
+					return len-left;
+				}
+				retval = wait_event_timeout(mdc800->download_wait,
+				     mdc800->downloaded,
+				     msecs_to_jiffies(TO_DOWNLOAD_GET_READY));
+				if (!retval)
+					usb_kill_urb(mdc800->download_urb);
+				mdc800->downloaded = 0;
+				if (mdc800->download_urb->status != 0)
+				{
+					dev_err(&mdc800->dev->dev,
+						"request download-bytes fails "
+						"(status=%i)\n",
+						mdc800->download_urb->status);
+					mutex_unlock(&mdc800->io_lock);
+					return len-left;
+				}
+			}
+			else
+			{
+				/* No more bytes -> that's an error*/
+				mutex_unlock(&mdc800->io_lock);
+				return -EIO;
+			}
+		}
+		else
+		{
+			/* Copy Bytes */
+			if (copy_to_user(ptr, &mdc800->out [mdc800->out_ptr],
+						sts)) {
+				mutex_unlock(&mdc800->io_lock);
+				return -EFAULT;
+			}
+			ptr+=sts;
+			left-=sts;
+			mdc800->out_ptr+=sts;
+		}
+	}
+
+	mutex_unlock(&mdc800->io_lock);
+	return len-left;
+}
+
+
+/*
+ * The Device write callback Function
+ * If a 8Byte Command is received, it will be send to the camera.
+ * After this the driver initiates the request for the answer or
+ * just waits until the camera becomes ready.
+ */
+static ssize_t mdc800_device_write (struct file *file, const char __user *buf, size_t len, loff_t *pos)
+{
+	size_t i=0;
+	int retval;
+
+	mutex_lock(&mdc800->io_lock);
+	if (mdc800->state != READY)
+	{
+		mutex_unlock(&mdc800->io_lock);
+		return -EBUSY;
+	}
+	if (!mdc800->open )
+	{
+		mutex_unlock(&mdc800->io_lock);
+		return -EBUSY;
+	}
+
+	while (i<len)
+	{
+		unsigned char c;
+		if (signal_pending (current)) 
+		{
+			mutex_unlock(&mdc800->io_lock);
+			return -EINTR;
+		}
+		
+		if(get_user(c, buf+i))
+		{
+			mutex_unlock(&mdc800->io_lock);
+			return -EFAULT;
+		}
+
+		/* check for command start */
+		if (c == 0x55)
+		{
+			mdc800->in_count=0;
+			mdc800->out_count=0;
+			mdc800->out_ptr=0;
+			mdc800->download_left=0;
+		}
+
+		/* save command byte */
+		if (mdc800->in_count < 8)
+		{
+			mdc800->in[mdc800->in_count] = c;
+			mdc800->in_count++;
+		}
+		else
+		{
+			mutex_unlock(&mdc800->io_lock);
+			return -EIO;
+		}
+
+		/* Command Buffer full ? -> send it to camera */
+		if (mdc800->in_count == 8)
+		{
+			int answersize;
+
+			if (mdc800_usb_waitForIRQ (0,TO_GET_READY))
+			{
+				dev_err(&mdc800->dev->dev,
+					"Camera didn't get ready.\n");
+				mutex_unlock(&mdc800->io_lock);
+				return -EIO;
+			}
+
+			answersize=mdc800_getAnswerSize (mdc800->in[1]);
+
+			mdc800->state=WORKING;
+			memcpy (mdc800->write_urb->transfer_buffer, mdc800->in,8);
+			mdc800->write_urb->dev = mdc800->dev;
+			retval = usb_submit_urb (mdc800->write_urb, GFP_KERNEL);
+			if (retval) {
+				dev_err(&mdc800->dev->dev,
+					"submitting write urb fails "
+					"(retval=%i)\n", retval);
+				mutex_unlock(&mdc800->io_lock);
+				return -EIO;
+			}
+			wait_event_timeout(mdc800->write_wait, mdc800->written,
+					msecs_to_jiffies(TO_WRITE_GET_READY));
+			mdc800->written = 0;
+			if (mdc800->state == WORKING)
+			{
+				usb_kill_urb(mdc800->write_urb);
+				mutex_unlock(&mdc800->io_lock);
+				return -EIO;
+			}
+
+			switch ((unsigned char) mdc800->in[1])
+			{
+				case 0x05: /* Download Image */
+				case 0x3e: /* Take shot in Fine Mode (WCam Mode) */
+					if (mdc800->pic_len < 0)
+					{
+						dev_err(&mdc800->dev->dev,
+							"call 0x07 before "
+							"0x05,0x3e\n");
+						mdc800->state=READY;
+						mutex_unlock(&mdc800->io_lock);
+						return -EIO;
+					}
+					mdc800->pic_len=-1;
+					fallthrough;
+
+				case 0x09: /* Download Thumbnail */
+					mdc800->download_left=answersize+64;
+					mdc800->state=DOWNLOAD;
+					mdc800_usb_waitForIRQ (0,TO_DOWNLOAD_GET_BUSY);
+					break;
+
+
+				default:
+					if (answersize)
+					{
+
+						if (mdc800_usb_waitForIRQ (1,TO_READ_FROM_IRQ))
+						{
+							dev_err(&mdc800->dev->dev, "requesting answer from irq fails\n");
+							mutex_unlock(&mdc800->io_lock);
+							return -EIO;
+						}
+
+						/* Write dummy data, (this is ugly but part of the USB Protocol */
+						/* if you use endpoint 1 as bulk and not as irq) */
+						memcpy (mdc800->out, mdc800->camera_response,8);
+
+						/* This is the interpreted answer */
+						memcpy (&mdc800->out[8], mdc800->camera_response,8);
+
+						mdc800->out_ptr=0;
+						mdc800->out_count=16;
+
+						/* Cache the Imagesize, if command was getImageSize */
+						if (mdc800->in [1] == (char) 0x07)
+						{
+							mdc800->pic_len=(int) 65536*(unsigned char) mdc800->camera_response[0]+256*(unsigned char) mdc800->camera_response[1]+(unsigned char) mdc800->camera_response[2];
+
+							dev_dbg(&mdc800->dev->dev, "cached imagesize = %i\n", mdc800->pic_len);
+						}
+
+					}
+					else
+					{
+						if (mdc800_usb_waitForIRQ (0,TO_DEFAULT_COMMAND))
+						{
+							dev_err(&mdc800->dev->dev, "Command Timeout.\n");
+							mutex_unlock(&mdc800->io_lock);
+							return -EIO;
+						}
+					}
+					mdc800->state=READY;
+					break;
+			}
+		}
+		i++;
+	}
+	mutex_unlock(&mdc800->io_lock);
+	return i;
+}
+
+
+/***************************************************************************
+	Init and Cleanup this driver (Structs and types)
+****************************************************************************/
+
+/* File Operations of this drivers */
+static const struct file_operations mdc800_device_ops =
+{
+	.owner =	THIS_MODULE,
+	.read =		mdc800_device_read,
+	.write =	mdc800_device_write,
+	.open =		mdc800_device_open,
+	.release =	mdc800_device_release,
+	.llseek =	noop_llseek,
+};
+
+
+
+static const struct usb_device_id mdc800_table[] = {
+	{ USB_DEVICE(MDC800_VENDOR_ID, MDC800_PRODUCT_ID) },
+	{ }						/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, mdc800_table);
+/*
+ * USB Driver Struct for this device
+ */
+static struct usb_driver mdc800_usb_driver =
+{
+	.name =		"mdc800",
+	.probe =	mdc800_usb_probe,
+	.disconnect =	mdc800_usb_disconnect,
+	.id_table =	mdc800_table
+};
+
+
+
+/************************************************************************
+	Init and Cleanup this driver (Main Functions)
+*************************************************************************/
+
+static int __init usb_mdc800_init (void)
+{
+	int retval = -ENODEV;
+	/* Allocate Memory */
+	mdc800=kzalloc_obj(struct mdc800_data);
+	if (!mdc800)
+		goto cleanup_on_fail;
+
+	mdc800->dev = NULL;
+	mdc800->state=NOT_CONNECTED;
+	mutex_init (&mdc800->io_lock);
+
+	init_waitqueue_head (&mdc800->irq_wait);
+	init_waitqueue_head (&mdc800->write_wait);
+	init_waitqueue_head (&mdc800->download_wait);
+
+	mdc800->irq_woken = 0;
+	mdc800->downloaded = 0;
+	mdc800->written = 0;
+
+	mdc800->irq_urb_buffer=kzalloc (8, GFP_KERNEL);
+	if (!mdc800->irq_urb_buffer)
+		goto cleanup_on_fail;
+	mdc800->write_urb_buffer=kmalloc (8, GFP_KERNEL);
+	if (!mdc800->write_urb_buffer)
+		goto cleanup_on_fail;
+	mdc800->download_urb_buffer=kzalloc (64, GFP_KERNEL);
+	if (!mdc800->download_urb_buffer)
+		goto cleanup_on_fail;
+
+	mdc800->irq_urb=usb_alloc_urb (0, GFP_KERNEL);
+	if (!mdc800->irq_urb)
+		goto cleanup_on_fail;
+	mdc800->download_urb=usb_alloc_urb (0, GFP_KERNEL);
+	if (!mdc800->download_urb)
+		goto cleanup_on_fail;
+	mdc800->write_urb=usb_alloc_urb (0, GFP_KERNEL);
+	if (!mdc800->write_urb)
+		goto cleanup_on_fail;
+
+	/* Register the driver */
+	retval = usb_register(&mdc800_usb_driver);
+	if (retval)
+		goto cleanup_on_fail;
+
+	printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
+	       DRIVER_DESC "\n");
+
+	return 0;
+
+	/* Clean driver up, when something fails */
+
+cleanup_on_fail:
+
+	if (mdc800 != NULL)
+	{
+		printk(KERN_ERR "mdc800: can't alloc memory!\n");
+
+		kfree(mdc800->download_urb_buffer);
+		kfree(mdc800->write_urb_buffer);
+		kfree(mdc800->irq_urb_buffer);
+
+		usb_free_urb(mdc800->write_urb);
+		usb_free_urb(mdc800->download_urb);
+		usb_free_urb(mdc800->irq_urb);
+
+		kfree (mdc800);
+	}
+	mdc800 = NULL;
+	return retval;
+}
+
+
+static void __exit usb_mdc800_cleanup (void)
+{
+	usb_deregister (&mdc800_usb_driver);
+
+	usb_free_urb (mdc800->irq_urb);
+	usb_free_urb (mdc800->download_urb);
+	usb_free_urb (mdc800->write_urb);
+
+	kfree (mdc800->irq_urb_buffer);
+	kfree (mdc800->write_urb_buffer);
+	kfree (mdc800->download_urb_buffer);
+
+	kfree (mdc800);
+	mdc800 = NULL;
+}
+
+module_init (usb_mdc800_init);
+module_exit (usb_mdc800_cleanup);
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/usb/image/microtek.c b/drivers/usb/image/microtek.c
new file mode 100644
index 000000000..1f0b3c44d
--- /dev/null
+++ b/drivers/usb/image/microtek.c
@@ -0,0 +1,769 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Driver for Microtek Scanmaker X6 USB scanner, and possibly others.
+ *
+ * (C) Copyright 2000 John Fremlin <vii@penguinpowered.com>
+ * (C) Copyright 2000 Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
+ *
+ * Parts shamelessly stolen from usb-storage and copyright by their
+ * authors. Thanks to Matt Dharm for giving us permission!
+ *
+ * This driver implements a SCSI host controller driver and a USB
+ * device driver. To avoid confusion, all the USB related stuff is
+ * prefixed by mts_usb_ and all the SCSI stuff by mts_scsi_.
+ *
+ * Microtek (www.microtek.com) did not release the specifications for
+ * their USB protocol to us, so we had to reverse engineer them. We
+ * don't know for which models they are valid.
+ *
+ * The X6 USB has three bulk endpoints, one output (0x1) down which
+ * commands and outgoing data are sent, and two input: 0x82 from which
+ * normal data is read from the scanner (in packets of maximum 32
+ * bytes) and from which the status byte is read, and 0x83 from which
+ * the results of a scan (or preview) are read in up to 64 * 1024 byte
+ * chunks by the Windows driver. We don't know how much it is possible
+ * to read at a time from 0x83.
+ *
+ * It seems possible to read (with URB transfers) everything from 0x82
+ * in one go, without bothering to read in 32 byte chunks.
+ *
+ * There seems to be an optimisation of a further READ implicit if
+ * you simply read from 0x83.
+ *
+ * Guessed protocol:
+ *
+ *	Send raw SCSI command to EP 0x1
+ *
+ *	If there is data to receive:
+ *		If the command was READ datatype=image:
+ *			Read a lot of data from EP 0x83
+ *		Else:
+ *			Read data from EP 0x82
+ *	Else:
+ *		If there is data to transmit:
+ *			Write it to EP 0x1
+ *
+ *	Read status byte from EP 0x82
+ *
+ * References:
+ *
+ * The SCSI command set for the scanner is available from
+ *	ftp://ftp.microtek.com/microtek/devpack/
+ *
+ * Microtek NV sent us a more up to date version of the document. If
+ * you want it, just send mail.
+ *
+ * Status:
+ *
+ *	Untested with multiple scanners.
+ *	Untested on a bigendian machine.
+ *
+ * History:
+ *
+ *	20000417 starting history
+ *	20000417 fixed load oops
+ *	20000417 fixed unload oops
+ *	20000419 fixed READ IMAGE detection
+ *	20000424 started conversion to use URBs
+ *	20000502 handled short transfers as errors
+ *	20000513 rename and organisation of functions (john)
+ *	20000513 added IDs for all products supported by Windows driver (john)
+ *	20000514 Rewrote mts_scsi_queuecommand to use URBs (john)
+ *	20000514 Version 0.0.8j
+ *      20000514 Fix reporting of non-existent devices to SCSI layer (john)
+ *	20000514 Added MTS_DEBUG_INT (john)
+ *	20000514 Changed "usb-microtek" to "microtek" for consistency (john)
+ *	20000514 Stupid bug fixes (john)
+ *	20000514 Version 0.0.9j
+ *	20000515 Put transfer context and URB in mts_desc (john)
+ *	20000515 Added prelim turn off debugging support (john)
+ *	20000515 Version 0.0.10j
+ *      20000515 Fixed up URB allocation (clear URB on alloc) (john)
+ *      20000515 Version 0.0.11j
+ *	20000516 Removed unnecessary spinlock in mts_transfer_context (john)
+ *	20000516 Removed unnecessary up on instance lock in mts_remove_nolock (john)
+ *	20000516 Implemented (badly) scsi_abort (john)
+ *	20000516 Version 0.0.12j
+ *      20000517 Hopefully removed mts_remove_nolock quasideadlock (john)
+ *      20000517 Added mts_debug_dump to print ll USB info (john)
+ *	20000518 Tweaks and documentation updates (john)
+ *	20000518 Version 0.0.13j
+ *	20000518 Cleaned up abort handling (john)
+ *	20000523 Removed scsi_command and various scsi_..._resets (john)
+ *	20000523 Added unlink URB on scsi_abort, now OHCI supports it (john)
+ *	20000523 Fixed last tiresome compile warning (john)
+ *	20000523 Version 0.0.14j (though version 0.1 has come out?)
+ *	20000602 Added primitive reset
+ *	20000602 Version 0.2.0
+ *	20000603 various cosmetic changes
+ *	20000603 Version 0.2.1
+ *	20000620 minor cosmetic changes
+ *	20000620 Version 0.2.2
+ *	20000822 Hopefully fixed deadlock in mts_remove_nolock()
+ *	20000822 Fixed minor race in mts_transfer_cleanup()
+ *	20000822 Fixed deadlock on submission error in queuecommand
+ *	20000822 Version 0.2.3
+ *	20000913 Reduced module size if debugging is off
+ *	20000913 Version 0.2.4
+ *      20010210 New abort logic
+ *      20010210 Version 0.3.0
+ *	20010217 Merged scatter/gather
+ *	20010218 Version 0.4.0
+ *	20010218 Cosmetic fixes
+ *	20010218 Version 0.4.1
+ *      20010306 Abort while using scatter/gather
+ *      20010306 Version 0.4.2
+ *      20010311 Remove all timeouts and tidy up generally (john)
+ *	20010320 check return value of scsi_register()
+ *	20010320 Version 0.4.3
+ *	20010408 Identify version on module load.
+ *	20011003 Fix multiple requests
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/random.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/usb.h>
+#include <linux/proc_fs.h>
+#include <linux/atomic.h>
+#include <linux/blkdev.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+
+#include "microtek.h"
+
+#define DRIVER_AUTHOR "John Fremlin <vii@penguinpowered.com>, Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>"
+#define DRIVER_DESC "Microtek Scanmaker X6 USB scanner driver"
+
+/* Should we do debugging? */
+
+//#define MTS_DO_DEBUG
+
+/* USB layer driver interface */
+
+static int mts_usb_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id);
+static void mts_usb_disconnect(struct usb_interface *intf);
+
+static const struct usb_device_id mts_usb_ids[];
+
+static struct usb_driver mts_usb_driver = {
+	.name =		"microtekX6",
+	.probe =	mts_usb_probe,
+	.disconnect =	mts_usb_disconnect,
+	.id_table =	mts_usb_ids,
+};
+
+
+/* Internal driver stuff */
+
+#define MTS_VERSION	"0.4.3"
+#define MTS_NAME	"microtek usb (rev " MTS_VERSION "): "
+
+#if defined MTS_DO_DEBUG
+
+#define MTS_DEBUG(x...) \
+	printk( KERN_DEBUG MTS_NAME x )
+
+#define MTS_DEBUG_INT() \
+	do { MTS_DEBUG("transfer = 0x%x context = 0x%x\n",(int)transfer,(int)context ); \
+	     MTS_DEBUG("status = 0x%x data-length = 0x%x sent = 0x%x\n",transfer->status,(int)context->data_length, (int)transfer->actual_length ); \
+             mts_debug_dump(context->instance);\
+	   } while(0)
+#else
+
+#define MTS_NUL_STATEMENT do { } while(0)
+
+#define MTS_DEBUG(x...)	MTS_NUL_STATEMENT
+#define MTS_DEBUG_INT() MTS_NUL_STATEMENT
+
+#endif
+
+
+
+#define MTS_INT_INIT()\
+	struct mts_transfer_context* context = (struct mts_transfer_context*)transfer->context; \
+	MTS_DEBUG_INT();\
+
+#ifdef MTS_DO_DEBUG
+
+static inline void mts_debug_dump(struct mts_desc* desc) {
+	MTS_DEBUG("desc at 0x%x: toggle = %02x%02x\n",
+		  (int)desc,
+		  (int)desc->usb_dev->toggle[1],(int)desc->usb_dev->toggle[0]
+		);
+	MTS_DEBUG("ep_out=%x ep_response=%x ep_image=%x\n",
+		  usb_sndbulkpipe(desc->usb_dev,desc->ep_out),
+		  usb_rcvbulkpipe(desc->usb_dev,desc->ep_response),
+		  usb_rcvbulkpipe(desc->usb_dev,desc->ep_image)
+		);
+}
+
+
+static inline void mts_show_command(struct scsi_cmnd *srb)
+{
+	char *what = NULL;
+
+	switch (srb->cmnd[0]) {
+	case TEST_UNIT_READY: what = "TEST_UNIT_READY"; break;
+	case REZERO_UNIT: what = "REZERO_UNIT"; break;
+	case REQUEST_SENSE: what = "REQUEST_SENSE"; break;
+	case FORMAT_UNIT: what = "FORMAT_UNIT"; break;
+	case READ_BLOCK_LIMITS: what = "READ_BLOCK_LIMITS"; break;
+	case REASSIGN_BLOCKS: what = "REASSIGN_BLOCKS"; break;
+	case READ_6: what = "READ_6"; break;
+	case WRITE_6: what = "WRITE_6"; break;
+	case SEEK_6: what = "SEEK_6"; break;
+	case READ_REVERSE: what = "READ_REVERSE"; break;
+	case WRITE_FILEMARKS: what = "WRITE_FILEMARKS"; break;
+	case SPACE: what = "SPACE"; break;
+	case INQUIRY: what = "INQUIRY"; break;
+	case RECOVER_BUFFERED_DATA: what = "RECOVER_BUFFERED_DATA"; break;
+	case MODE_SELECT: what = "MODE_SELECT"; break;
+	case RESERVE: what = "RESERVE"; break;
+	case RELEASE: what = "RELEASE"; break;
+	case COPY: what = "COPY"; break;
+	case ERASE: what = "ERASE"; break;
+	case MODE_SENSE: what = "MODE_SENSE"; break;
+	case START_STOP: what = "START_STOP"; break;
+	case RECEIVE_DIAGNOSTIC: what = "RECEIVE_DIAGNOSTIC"; break;
+	case SEND_DIAGNOSTIC: what = "SEND_DIAGNOSTIC"; break;
+	case ALLOW_MEDIUM_REMOVAL: what = "ALLOW_MEDIUM_REMOVAL"; break;
+	case SET_WINDOW: what = "SET_WINDOW"; break;
+	case READ_CAPACITY: what = "READ_CAPACITY"; break;
+	case READ_10: what = "READ_10"; break;
+	case WRITE_10: what = "WRITE_10"; break;
+	case SEEK_10: what = "SEEK_10"; break;
+	case WRITE_VERIFY: what = "WRITE_VERIFY"; break;
+	case VERIFY: what = "VERIFY"; break;
+	case SEARCH_HIGH: what = "SEARCH_HIGH"; break;
+	case SEARCH_EQUAL: what = "SEARCH_EQUAL"; break;
+	case SEARCH_LOW: what = "SEARCH_LOW"; break;
+	case SET_LIMITS: what = "SET_LIMITS"; break;
+	case READ_POSITION: what = "READ_POSITION"; break;
+	case SYNCHRONIZE_CACHE: what = "SYNCHRONIZE_CACHE"; break;
+	case LOCK_UNLOCK_CACHE: what = "LOCK_UNLOCK_CACHE"; break;
+	case READ_DEFECT_DATA: what = "READ_DEFECT_DATA"; break;
+	case MEDIUM_SCAN: what = "MEDIUM_SCAN"; break;
+	case COMPARE: what = "COMPARE"; break;
+	case COPY_VERIFY: what = "COPY_VERIFY"; break;
+	case WRITE_BUFFER: what = "WRITE_BUFFER"; break;
+	case READ_BUFFER: what = "READ_BUFFER"; break;
+	case UPDATE_BLOCK: what = "UPDATE_BLOCK"; break;
+	case READ_LONG: what = "READ_LONG"; break;
+	case WRITE_LONG: what = "WRITE_LONG"; break;
+	case CHANGE_DEFINITION: what = "CHANGE_DEFINITION"; break;
+	case WRITE_SAME: what = "WRITE_SAME"; break;
+	case READ_TOC: what = "READ_TOC"; break;
+	case LOG_SELECT: what = "LOG_SELECT"; break;
+	case LOG_SENSE: what = "LOG_SENSE"; break;
+	case MODE_SELECT_10: what = "MODE_SELECT_10"; break;
+	case MODE_SENSE_10: what = "MODE_SENSE_10"; break;
+	case MOVE_MEDIUM: what = "MOVE_MEDIUM"; break;
+	case READ_12: what = "READ_12"; break;
+	case WRITE_12: what = "WRITE_12"; break;
+	case WRITE_VERIFY_12: what = "WRITE_VERIFY_12"; break;
+	case SEARCH_HIGH_12: what = "SEARCH_HIGH_12"; break;
+	case SEARCH_EQUAL_12: what = "SEARCH_EQUAL_12"; break;
+	case SEARCH_LOW_12: what = "SEARCH_LOW_12"; break;
+	case READ_ELEMENT_STATUS: what = "READ_ELEMENT_STATUS"; break;
+	case SEND_VOLUME_TAG: what = "SEND_VOLUME_TAG"; break;
+	case WRITE_LONG_2: what = "WRITE_LONG_2"; break;
+	default:
+		MTS_DEBUG("can't decode command\n");
+		goto out;
+		break;
+	}
+	MTS_DEBUG( "Command %s (%d bytes)\n", what, srb->cmd_len);
+
+ out:
+	MTS_DEBUG( "  %10ph\n", srb->cmnd);
+}
+
+#else
+
+static inline void mts_show_command(struct scsi_cmnd * dummy)
+{
+}
+
+static inline void mts_debug_dump(struct mts_desc* dummy)
+{
+}
+
+#endif
+
+static inline void mts_urb_abort(struct mts_desc* desc) {
+	mts_debug_dump(desc);
+
+	usb_kill_urb( desc->urb );
+}
+
+static int mts_sdev_init (struct scsi_device *s)
+{
+	s->inquiry_len = 0x24;
+	return 0;
+}
+
+static int mts_scsi_abort(struct scsi_cmnd *srb)
+{
+	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
+
+	mts_urb_abort(desc);
+
+	return FAILED;
+}
+
+static int mts_scsi_host_reset(struct scsi_cmnd *srb)
+{
+	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
+	int result;
+
+	mts_debug_dump(desc);
+
+	result = usb_lock_device_for_reset(desc->usb_dev, desc->usb_intf);
+	if (result == 0) {
+		result = usb_reset_device(desc->usb_dev);
+		usb_unlock_device(desc->usb_dev);
+	}
+	return result ? FAILED : SUCCESS;
+}
+
+static enum scsi_qc_status mts_scsi_queuecommand(struct Scsi_Host *shost,
+						 struct scsi_cmnd *srb);
+
+static void mts_transfer_cleanup( struct urb *transfer );
+static void mts_do_sg(struct urb * transfer);
+
+static inline
+void mts_int_submit_urb (struct urb* transfer,
+			int pipe,
+			void* data,
+			unsigned length,
+			usb_complete_t callback )
+/* Interrupt context! */
+
+/* Holding transfer->context->lock! */
+{
+	int res;
+
+	MTS_INT_INIT();
+
+	usb_fill_bulk_urb(transfer,
+		      context->instance->usb_dev,
+		      pipe,
+		      data,
+		      length,
+		      callback,
+		      context
+		);
+
+	res = usb_submit_urb( transfer, GFP_ATOMIC );
+	if ( unlikely(res) ) {
+		dev_err(&context->instance->usb_dev->dev,
+			"could not submit URB! Error was %d\n",(int)res );
+		set_host_byte(context->srb, DID_ERROR);
+		mts_transfer_cleanup(transfer);
+	}
+}
+
+
+static void mts_transfer_cleanup( struct urb *transfer )
+/* Interrupt context! */
+{
+	MTS_INT_INIT();
+
+	if ( likely(context->final_callback != NULL) )
+		context->final_callback(context->srb);
+}
+
+static void mts_transfer_done( struct urb *transfer )
+{
+	MTS_INT_INIT();
+
+	context->srb->result &= MTS_SCSI_ERR_MASK;
+	context->srb->result |= (unsigned)(*context->scsi_status)<<1;
+
+	mts_transfer_cleanup(transfer);
+}
+
+
+static void mts_get_status( struct urb *transfer )
+/* Interrupt context! */
+{
+	MTS_INT_INIT();
+
+	mts_int_submit_urb(transfer,
+			   usb_rcvbulkpipe(context->instance->usb_dev,
+					   context->instance->ep_response),
+			   context->scsi_status,
+			   1,
+			   mts_transfer_done );
+}
+
+static void mts_data_done( struct urb* transfer )
+/* Interrupt context! */
+{
+	int status = transfer->status;
+	MTS_INT_INIT();
+
+	if ( context->data_length != transfer->actual_length ) {
+		scsi_set_resid(context->srb, context->data_length -
+			       transfer->actual_length);
+	} else if ( unlikely(status) ) {
+		set_host_byte(context->srb, (status == -ENOENT ? DID_ABORT : DID_ERROR));
+	}
+
+	mts_get_status(transfer);
+}
+
+
+static void mts_command_done( struct urb *transfer )
+/* Interrupt context! */
+{
+	int status = transfer->status;
+	MTS_INT_INIT();
+
+	if ( unlikely(status) ) {
+	        if (status == -ENOENT) {
+		        /* We are being killed */
+			set_host_byte(context->srb, DID_ABORT);
+                } else {
+		        /* A genuine error has occurred */
+		        set_host_byte(context->srb, DID_ERROR);
+                }
+		mts_transfer_cleanup(transfer);
+
+		return;
+	}
+
+	if (context->srb->cmnd[0] == REQUEST_SENSE) {
+		mts_int_submit_urb(transfer,
+				   context->data_pipe,
+				   context->srb->sense_buffer,
+				   context->data_length,
+				   mts_data_done);
+	} else { if ( context->data ) {
+			mts_int_submit_urb(transfer,
+					   context->data_pipe,
+					   context->data,
+					   context->data_length,
+					   scsi_sg_count(context->srb) > 1 ?
+					           mts_do_sg : mts_data_done);
+		} else {
+			mts_get_status(transfer);
+		}
+	}
+}
+
+static void mts_do_sg (struct urb* transfer)
+{
+	int status = transfer->status;
+	MTS_INT_INIT();
+
+	MTS_DEBUG("Processing fragment %d of %d\n", context->fragment,
+	                                          scsi_sg_count(context->srb));
+
+	if (unlikely(status)) {
+                set_host_byte(context->srb, (status == -ENOENT ? DID_ABORT : DID_ERROR));
+		mts_transfer_cleanup(transfer);
+        }
+
+	context->curr_sg = sg_next(context->curr_sg);
+	mts_int_submit_urb(transfer,
+			   context->data_pipe,
+			   sg_virt(context->curr_sg),
+			   context->curr_sg->length,
+			   sg_is_last(context->curr_sg) ?
+			   mts_data_done : mts_do_sg);
+}
+
+static const u8 mts_read_image_sig[] = { 0x28, 00, 00, 00 };
+static const u8 mts_read_image_sig_len = 4;
+static const unsigned char mts_direction[256/8] = {
+	0x28, 0x81, 0x14, 0x14, 0x20, 0x01, 0x90, 0x77,
+	0x0C, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+
+#define MTS_DIRECTION_IS_IN(x) ((mts_direction[x>>3] >> (x & 7)) & 1)
+
+static void
+mts_build_transfer_context(struct scsi_cmnd *srb, struct mts_desc* desc)
+{
+	int pipe;
+
+	desc->context.instance = desc;
+	desc->context.srb = srb;
+
+	if (!scsi_bufflen(srb)) {
+		desc->context.data = NULL;
+		desc->context.data_length = 0;
+		return;
+	} else {
+		desc->context.curr_sg = scsi_sglist(srb);
+		desc->context.data = sg_virt(desc->context.curr_sg);
+		desc->context.data_length = desc->context.curr_sg->length;
+	}
+
+
+	/* can't rely on srb->sc_data_direction */
+
+	/* Brutally ripped from usb-storage */
+
+	if ( !memcmp( srb->cmnd, mts_read_image_sig, mts_read_image_sig_len )
+) { 		pipe = usb_rcvbulkpipe(desc->usb_dev,desc->ep_image);
+		MTS_DEBUG( "transferring from desc->ep_image == %d\n",
+			   (int)desc->ep_image );
+	} else if ( MTS_DIRECTION_IS_IN(srb->cmnd[0]) ) {
+			pipe = usb_rcvbulkpipe(desc->usb_dev,desc->ep_response);
+			MTS_DEBUG( "transferring from desc->ep_response == %d\n",
+				   (int)desc->ep_response);
+	} else {
+		MTS_DEBUG("transferring to desc->ep_out == %d\n",
+			  (int)desc->ep_out);
+		pipe = usb_sndbulkpipe(desc->usb_dev,desc->ep_out);
+	}
+	desc->context.data_pipe = pipe;
+}
+
+static enum scsi_qc_status mts_scsi_queuecommand_lck(struct scsi_cmnd *srb)
+{
+	mts_scsi_cmnd_callback callback = scsi_done;
+	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
+	int res;
+
+	mts_show_command(srb);
+	mts_debug_dump(desc);
+
+	if ( srb->device->lun || srb->device->id || srb->device->channel ) {
+
+		MTS_DEBUG("Command to LUN=%d ID=%d CHANNEL=%d from SCSI layer\n",(int)srb->device->lun,(int)srb->device->id, (int)srb->device->channel );
+
+		MTS_DEBUG("this device doesn't exist\n");
+
+		set_host_byte(srb, DID_BAD_TARGET);
+
+		if(likely(callback != NULL))
+			callback(srb);
+
+		goto out;
+	}
+
+	
+	usb_fill_bulk_urb(desc->urb,
+		      desc->usb_dev,
+		      usb_sndbulkpipe(desc->usb_dev,desc->ep_out),
+		      srb->cmnd,
+		      srb->cmd_len,
+		      mts_command_done,
+		      &desc->context
+		      );
+
+
+	mts_build_transfer_context( srb, desc );
+	desc->context.final_callback = callback;
+	
+	/* here we need ATOMIC as we are called with the iolock */
+	res=usb_submit_urb(desc->urb, GFP_ATOMIC);
+
+	if(unlikely(res)){
+		dev_err(&desc->usb_dev->dev, "error %d submitting URB\n",(int)res);
+		set_host_byte(srb, DID_ERROR);
+
+		if(likely(callback != NULL))
+			callback(srb);
+
+	}
+out:
+	return 0;
+}
+
+static DEF_SCSI_QCMD(mts_scsi_queuecommand)
+
+static const struct scsi_host_template mts_scsi_host_template = {
+	.module			= THIS_MODULE,
+	.name			= "microtekX6",
+	.proc_name		= "microtekX6",
+	.queuecommand		= mts_scsi_queuecommand,
+	.eh_abort_handler	= mts_scsi_abort,
+	.eh_host_reset_handler	= mts_scsi_host_reset,
+	.sg_tablesize =		SG_ALL,
+	.can_queue =		1,
+	.this_id =		-1,
+	.emulated =		1,
+	.dma_alignment =	511,
+	.sdev_init =		mts_sdev_init,
+	.max_sectors=		256, /* 128 K */
+};
+
+/* The entries of microtek_table must correspond, line-by-line to
+   the entries of mts_supported_products[]. */
+
+static const struct usb_device_id mts_usb_ids[] =
+{
+	{ USB_DEVICE(0x4ce, 0x0300) },
+	{ USB_DEVICE(0x5da, 0x0094) },
+	{ USB_DEVICE(0x5da, 0x0099) },
+	{ USB_DEVICE(0x5da, 0x009a) },
+	{ USB_DEVICE(0x5da, 0x00a0) },
+	{ USB_DEVICE(0x5da, 0x00a3) },
+	{ USB_DEVICE(0x5da, 0x80a3) },
+	{ USB_DEVICE(0x5da, 0x80ac) },
+	{ USB_DEVICE(0x5da, 0x00b6) },
+	{ }						/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, mts_usb_ids);
+
+
+static int mts_usb_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	int i;
+	int ep_out = -1;
+	int ep_in_set[3]; /* this will break if we have more than three endpoints
+			   which is why we check */
+	int *ep_in_current = ep_in_set;
+	int err_retval = -ENOMEM;
+
+	struct mts_desc * new_desc;
+	struct usb_device *dev = interface_to_usbdev (intf);
+
+	/* the current altsetting on the interface we're probing */
+	struct usb_host_interface *altsetting;
+
+	MTS_DEBUG( "usb-device descriptor at %x\n", (int)dev );
+
+	MTS_DEBUG( "product id = 0x%x, vendor id = 0x%x\n",
+		   le16_to_cpu(dev->descriptor.idProduct),
+		   le16_to_cpu(dev->descriptor.idVendor) );
+
+	/* the current altsetting on the interface we're probing */
+	altsetting = intf->cur_altsetting;
+
+	/* Check if the config is sane */
+
+	if ( altsetting->desc.bNumEndpoints != MTS_EP_TOTAL ) {
+		dev_warn(&dev->dev, "expecting %d got %d endpoints! Bailing out.\n",
+			     (int)MTS_EP_TOTAL, (int)altsetting->desc.bNumEndpoints );
+		return -ENODEV;
+	}
+
+	for( i = 0; i < altsetting->desc.bNumEndpoints; i++ ) {
+		if (usb_endpoint_is_bulk_in(&altsetting->endpoint[i].desc)) {
+			*ep_in_current++ = usb_endpoint_num(&altsetting->endpoint[i].desc);
+		} else if (usb_endpoint_is_bulk_out(&altsetting->endpoint[i].desc)) {
+			if (ep_out == -1) {
+				ep_out = usb_endpoint_num(&altsetting->endpoint[i].desc);
+			} else {
+				dev_warn(&dev->dev, "can only deal with bulk endpoints; endpoint %d is not bulk.\n",
+						usb_endpoint_num(&altsetting->endpoint[i].desc));
+				return -ENODEV;
+			}
+		} else {
+			dev_warn(&dev->dev, "can only deal with bulk endpoints; endpoint %d is not bulk.\n",
+					usb_endpoint_num(&altsetting->endpoint[i].desc));
+		}
+	}
+
+	if (ep_in_current != &ep_in_set[2]) {
+		dev_warn(&dev->dev, "couldn't find two input bulk endpoints. Bailing out.\n");
+		return -ENODEV;
+	}
+
+	if ( ep_out == -1 ) {
+		dev_warn(&dev->dev, "couldn't find an output bulk endpoint. Bailing out.\n" );
+		return -ENODEV;
+	}
+
+
+	new_desc = kzalloc_obj(struct mts_desc);
+	if (!new_desc)
+		goto out;
+
+	new_desc->urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!new_desc->urb)
+		goto out_kfree;
+
+	new_desc->context.scsi_status = kmalloc(1, GFP_KERNEL);
+	if (!new_desc->context.scsi_status)
+		goto out_free_urb;
+
+	new_desc->usb_dev = dev;
+	new_desc->usb_intf = intf;
+
+	/* endpoints */
+	new_desc->ep_out = ep_out;
+	new_desc->ep_response = ep_in_set[0];
+	new_desc->ep_image = ep_in_set[1];
+
+	if ( new_desc->ep_out != MTS_EP_OUT )
+		dev_warn(&dev->dev, "will this work? Command EP is not usually %d\n",
+			     (int)new_desc->ep_out );
+
+	if ( new_desc->ep_response != MTS_EP_RESPONSE )
+		dev_warn(&dev->dev, "will this work? Response EP is not usually %d\n",
+			     (int)new_desc->ep_response );
+
+	if ( new_desc->ep_image != MTS_EP_IMAGE )
+		dev_warn(&dev->dev, "will this work? Image data EP is not usually %d\n",
+			     (int)new_desc->ep_image );
+
+	new_desc->host = scsi_host_alloc(&mts_scsi_host_template,
+			sizeof(new_desc));
+	if (!new_desc->host)
+		goto out_kfree2;
+
+	new_desc->host->hostdata[0] = (unsigned long)new_desc;
+	if (scsi_add_host(new_desc->host, &dev->dev)) {
+		err_retval = -EIO;
+		goto out_host_put;
+	}
+	scsi_scan_host(new_desc->host);
+
+	usb_set_intfdata(intf, new_desc);
+	return 0;
+
+ out_host_put:
+	scsi_host_put(new_desc->host);
+ out_kfree2:
+	kfree(new_desc->context.scsi_status);
+ out_free_urb:
+	usb_free_urb(new_desc->urb);
+ out_kfree:
+	kfree(new_desc);
+ out:
+	return err_retval;
+}
+
+static void mts_usb_disconnect (struct usb_interface *intf)
+{
+	struct mts_desc *desc = usb_get_intfdata(intf);
+
+	usb_set_intfdata(intf, NULL);
+
+	usb_kill_urb(desc->urb);
+	scsi_remove_host(desc->host);
+
+	scsi_host_put(desc->host);
+	usb_free_urb(desc->urb);
+	kfree(desc->context.scsi_status);
+	kfree(desc);
+}
+
+module_usb_driver(mts_usb_driver);
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/image/microtek.h b/drivers/usb/image/microtek.h
new file mode 100644
index 000000000..7bd5f4639
--- /dev/null
+++ b/drivers/usb/image/microtek.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+ /*
+ * Driver for Microtek Scanmaker X6 USB scanner and possibly others.
+ * 
+ * (C) Copyright 2000 John Fremlin <vii@penguinpowered.com>
+ * (C) Copyright 2000 Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
+ *
+ * See microtek.c for history
+ *
+ */
+
+typedef void (*mts_scsi_cmnd_callback)(struct scsi_cmnd *);
+
+
+struct mts_transfer_context
+{
+	struct mts_desc *instance;
+	mts_scsi_cmnd_callback final_callback;
+	struct scsi_cmnd *srb;
+	
+	void *data;
+	unsigned data_length;
+	int data_pipe;
+	struct scatterlist *curr_sg;
+
+	u8 *scsi_status; /* status returned from ep_response after command completion */
+};
+
+
+struct mts_desc {
+	struct mts_desc *next;
+	struct mts_desc *prev;
+
+	struct usb_device *usb_dev;
+	struct usb_interface *usb_intf;
+
+	/* Endpoint addresses */
+	u8 ep_out;
+	u8 ep_response;
+	u8 ep_image;
+
+	struct Scsi_Host *host;
+
+	struct urb *urb;
+	struct mts_transfer_context context;
+};
+
+
+#define MTS_EP_OUT	0x1
+#define MTS_EP_RESPONSE	0x2
+#define MTS_EP_IMAGE	0x3
+#define MTS_EP_TOTAL	0x3
+
+#define MTS_SCSI_ERR_MASK ~0x3fu
+