Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 810 insertions, 0 deletions

diff --git a/drivers/usb/image/microtek.c b/drivers/usb/image/microtek.c
new file mode 100644
index 000000000..874ea4b54
--- /dev/null
+++ b/drivers/usb/image/microtek.c
@@ -0,0 +1,810 @@
+// 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 SMP.
+ *	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 "): "
+
+#define MTS_WARNING(x...) \
+	printk( KERN_WARNING MTS_NAME x )
+#define MTS_ERROR(x...) \
+	printk( KERN_ERR MTS_NAME x )
+#define MTS_INT_ERROR(x...) \
+	MTS_ERROR(x)
+#define MTS_MESSAGE(x...) \
+	printk( KERN_INFO MTS_NAME x )
+
+#if defined MTS_DO_DEBUG
+
+#define MTS_DEBUG(x...) \
+	printk( KERN_DEBUG MTS_NAME x )
+
+#define MTS_DEBUG_GOT_HERE() \
+	MTS_DEBUG("got to %s:%d (%s)\n", __FILE__, (int)__LINE__, __func__ )
+#define MTS_DEBUG_INT() \
+	do { MTS_DEBUG_GOT_HERE(); \
+	     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_GOT_HERE() 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_GOT_HERE();
+	mts_debug_dump(desc);
+
+	usb_kill_urb( desc->urb );
+}
+
+static int mts_slave_alloc (struct scsi_device *s)
+{
+	s->inquiry_len = 0x24;
+	return 0;
+}
+
+static int mts_slave_configure (struct scsi_device *s)
+{
+	blk_queue_dma_alignment(s->request_queue, (512 - 1));
+	return 0;
+}
+
+static int mts_scsi_abort(struct scsi_cmnd *srb)
+{
+	struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
+
+	MTS_DEBUG_GOT_HERE();
+
+	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_GOT_HERE();
+	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 int
+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) ) {
+		MTS_INT_ERROR( "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 */
+			MTS_DEBUG_GOT_HERE();
+			set_host_byte(context->srb, DID_ABORT);
+                } else {
+		        /* A genuine error has occurred */
+			MTS_DEBUG_GOT_HERE();
+
+		        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;
+
+	MTS_DEBUG_GOT_HERE();
+
+	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 int 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_DEBUG_GOT_HERE();
+	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)){
+		MTS_ERROR("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 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,
+	.slave_alloc =		mts_slave_alloc,
+	.slave_configure =	mts_slave_configure,
+	.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_GOT_HERE();
+	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) );
+
+	MTS_DEBUG_GOT_HERE();
+
+	/* 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 ) {
+		MTS_WARNING( "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 ((altsetting->endpoint[i].desc.bmAttributes &
+		     USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_BULK) {
+
+			MTS_WARNING( "can only deal with bulk endpoints; endpoint %d is not bulk.\n",
+			     (int)altsetting->endpoint[i].desc.bEndpointAddress );
+		} else {
+			if (altsetting->endpoint[i].desc.bEndpointAddress &
+			    USB_DIR_IN)
+				*ep_in_current++
+					= altsetting->endpoint[i].desc.bEndpointAddress &
+					USB_ENDPOINT_NUMBER_MASK;
+			else {
+				if ( ep_out != -1 ) {
+					MTS_WARNING( "can only deal with one output endpoints. Bailing out." );
+					return -ENODEV;
+				}
+
+				ep_out = altsetting->endpoint[i].desc.bEndpointAddress &
+					USB_ENDPOINT_NUMBER_MASK;
+			}
+		}
+
+	}
+
+	if (ep_in_current != &ep_in_set[2]) {
+		MTS_WARNING("couldn't find two input bulk endpoints. Bailing out.\n");
+		return -ENODEV;
+	}
+
+	if ( ep_out == -1 ) {
+		MTS_WARNING( "couldn't find an output bulk endpoint. Bailing out.\n" );
+		return -ENODEV;
+	}
+
+
+	new_desc = kzalloc(sizeof(struct mts_desc), GFP_KERNEL);
+	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 )
+		MTS_WARNING( "will this work? Command EP is not usually %d\n",
+			     (int)new_desc->ep_out );
+
+	if ( new_desc->ep_response != MTS_EP_RESPONSE )
+		MTS_WARNING( "will this work? Response EP is not usually %d\n",
+			     (int)new_desc->ep_response );
+
+	if ( new_desc->ep_image != MTS_EP_IMAGE )
+		MTS_WARNING( "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");