/* Driver for Datafab USB Compact Flash reader
 *
 * datafab driver v0.1:
 *
 * First release
 *
 * Current development and maintenance by:
 *   (c) 2000 Jimmie Mayfield (mayfield+datafab@sackheads.org)
 *
 *   Many thanks to Robert Baruch for the SanDisk SmartMedia reader driver
 *   which I used as a template for this driver.
 *
 *   Some bugfixes and scatter-gather code by Gregory P. Smith 
 *   (greg-usb@electricrain.com)
 *
 *   Fix for media change by Joerg Schneider (js@joergschneider.com)
 *
 * Other contributors:
 *   (c) 2002 Alan Stern <stern@rowland.org>
 *
 * 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.
 */

/*
 * This driver attempts to support USB CompactFlash reader/writer devices
 * based on Datafab USB-to-ATA chips.  It was specifically developed for the 
 * Datafab MDCFE-B USB CompactFlash reader but has since been found to work 
 * with a variety of Datafab-based devices from a number of manufacturers.
 * I've received a report of this driver working with a Datafab-based
 * SmartMedia device though please be aware that I'm personally unable to
 * test SmartMedia support.
 *
 * This driver supports reading and writing.  If you're truly paranoid,
 * however, you can force the driver into a write-protected state by setting
 * the WP enable bits in datafab_handle_mode_sense().  See the comments
 * in that routine.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"

MODULE_DESCRIPTION("Driver for Datafab USB Compact Flash reader");
MODULE_AUTHOR("Jimmie Mayfield <mayfield+datafab@sackheads.org>");
MODULE_LICENSE("GPL");

struct datafab_info {
        unsigned long   sectors;        /* total sector count */
        unsigned long   ssize;          /* sector size in bytes */
        signed char     lun;            /* used for dual-slot readers */

        /* the following aren't used yet */
        unsigned char   sense_key;
        unsigned long   sense_asc;      /* additional sense code */
        unsigned long   sense_ascq;     /* additional sense code qualifier */
};

static int datafab_determine_lun(struct us_data *us,
                                 struct datafab_info *info);


/*
 * The table of devices
 */
#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
                    vendorName, productName, useProtocol, useTransport, \
                    initFunction, flags) \
{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
  .driver_info = (flags)|(USB_US_TYPE_STOR<<24) }

static struct usb_device_id datafab_usb_ids[] = {
#       include "unusual_datafab.h"
        { }             /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, datafab_usb_ids);

#undef UNUSUAL_DEV

/*
 * The flags table
 */
#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,  \
}

static struct us_unusual_dev datafab_unusual_dev_list[] = {
#       include "unusual_datafab.h"
        { }             /* Terminating entry */
};

#undef UNUSUAL_DEV


static inline int
datafab_bulk_read(struct us_data *us, unsigned char *data, unsigned int len) {
        if (len == 0)
                return USB_STOR_XFER_GOOD;

        US_DEBUGP("datafab_bulk_read:  len = %d\n", len);
        return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
                        data, len, NULL);
}


static inline int
datafab_bulk_write(struct us_data *us, unsigned char *data, unsigned int len) {
        if (len == 0)
                return USB_STOR_XFER_GOOD;

        US_DEBUGP("datafab_bulk_write:  len = %d\n", len);
        return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
                        data, len, NULL);
}


static int datafab_read_data(struct us_data *us,
                             struct datafab_info *info,
                             u32 sector,
                             u32 sectors)
{
        unsigned char *command = us->iobuf;
        unsigned char *buffer;
        unsigned char  thistime;
        unsigned int totallen, alloclen;
        int len, result;
        unsigned int sg_offset = 0;
        struct scatterlist *sg = NULL;

        // we're working in LBA mode.  according to the ATA spec, 
        // we can support up to 28-bit addressing.  I don't know if Datafab
        // supports beyond 24-bit addressing.  It's kind of hard to test 
        // since it requires > 8GB CF card.
        //
        if (sectors > 0x0FFFFFFF)
                return USB_STOR_TRANSPORT_ERROR;

        if (info->lun == -1) {
                result = datafab_determine_lun(us, info);
                if (result != USB_STOR_TRANSPORT_GOOD)
                        return result;
        }

        totallen = sectors * info->ssize;

        // Since we don't read more than 64 KB at a time, we have to create
        // a bounce buffer and move the data a piece at a time between the
        // bounce buffer and the actual transfer buffer.

        alloclen = min(totallen, 65536u);
        buffer = kmalloc(alloclen, GFP_NOIO);
        if (buffer == NULL)
                return USB_STOR_TRANSPORT_ERROR;

        do {
                // loop, never allocate or transfer more than 64k at once
                // (min(128k, 255*info->ssize) is the real limit)

                len = min(totallen, alloclen);
                thistime = (len / info->ssize) & 0xff;

                command[0] = 0;
                command[1] = thistime;
                command[2] = sector & 0xFF;
                command[3] = (sector >> 8) & 0xFF;
                command[4] = (sector >> 16) & 0xFF;

                command[5] = 0xE0 + (info->lun << 4);
                command[5] |= (sector >> 24) & 0x0F;
                command[6] = 0x20;
                command[7] = 0x01;

                // send the read command
                result = datafab_bulk_write(us, command, 8);
                if (result != USB_STOR_XFER_GOOD)
                        goto leave;

                // read the result
                result = datafab_bulk_read(us, buffer, len);
                if (result != USB_STOR_XFER_GOOD)
                        goto leave;

                // Store the data in the transfer buffer
                usb_stor_access_xfer_buf(buffer, len, us->srb,
                                 &sg, &sg_offset, TO_XFER_BUF);

                sector += thistime;
                totallen -= len;
        } while (totallen > 0);

        kfree(buffer);
        return USB_STOR_TRANSPORT_GOOD;

 leave:
        kfree(buffer);
        return USB_STOR_TRANSPORT_ERROR;
}


static int datafab_write_data(struct us_data *us,
                              struct datafab_info *info,
                              u32 sector,
                              u32 sectors)
{
        unsigned char *command = us->iobuf;
        unsigned char *reply = us->iobuf;
        unsigned char *buffer;
        unsigned char thistime;
        unsigned int totallen, alloclen;
        int len, result;
        unsigned int sg_offset = 0;
        struct scatterlist *sg = NULL;

        // we're working in LBA mode.  according to the ATA spec, 
        // we can support up to 28-bit addressing.  I don't know if Datafab
        // supports beyond 24-bit addressing.  It's kind of hard to test 
        // since it requires > 8GB CF card.
        //
        if (sectors > 0x0FFFFFFF)
                return USB_STOR_TRANSPORT_ERROR;

        if (info->lun == -1) {
                result = datafab_determine_lun(us, info);
                if (result != USB_STOR_TRANSPORT_GOOD)
                        return result;
        }

        totallen = sectors * info->ssize;

        // Since we don't write more than 64 KB at a time, we have to create
        // a bounce buffer and move the data a piece at a time between the
        // bounce buffer and the actual transfer buffer.

        alloclen = min(totallen, 65536u);
        buffer = kmalloc(alloclen, GFP_NOIO);
        if (buffer == NULL)
                return USB_STOR_TRANSPORT_ERROR;

        do {
                // loop, never allocate or transfer more than 64k at once
                // (min(128k, 255*info->ssize) is the real limit)

                len = min(totallen, alloclen);
                thistime = (len / info->ssize) & 0xff;

                // Get the data from the transfer buffer
                usb_stor_access_xfer_buf(buffer, len, us->srb,
                                &sg, &sg_offset, FROM_XFER_BUF);

                command[0] = 0;
                command[1] = thistime;
                command[2] = sector & 0xFF;
                command[3] = (sector >> 8) & 0xFF;
                command[4] = (sector >> 16) & 0xFF;

                command[5] = 0xE0 + (info->lun << 4);
                command[5] |= (sector >> 24) & 0x0F;
                command[6] = 0x30;
                command[7] = 0x02;

                // send the command
                result = datafab_bulk_write(us, command, 8);
                if (result != USB_STOR_XFER_GOOD)
                        goto leave;

                // send the data
                result = datafab_bulk_write(us, buffer, len);
                if (result != USB_STOR_XFER_GOOD)
                        goto leave;

                // read the result
                result = datafab_bulk_read(us, reply, 2);
                if (result != USB_STOR_XFER_GOOD)
                        goto leave;

                if (reply[0] != 0x50 && reply[1] != 0) {
                        US_DEBUGP("datafab_write_data:  Gah! "
                                  "write return code: %02x %02x\n",
                                  reply[0], reply[1]);
                        result = USB_STOR_TRANSPORT_ERROR;
                        goto leave;
                }

                sector += thistime;
                totallen -= len;
        } while (totallen > 0);

        kfree(buffer);
        return USB_STOR_TRANSPORT_GOOD;

 leave:
        kfree(buffer);
        return USB_STOR_TRANSPORT_ERROR;
}


static int datafab_determine_lun(struct us_data *us,
                                 struct datafab_info *info)
{
        // Dual-slot readers can be thought of as dual-LUN devices.
        // We need to determine which card slot is being used.
        // We'll send an IDENTIFY DEVICE command and see which LUN responds...
        //
        // There might be a better way of doing this?

        static unsigned char scommand[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 };
        unsigned char *command = us->iobuf;
        unsigned char *buf;
        int count = 0, rc;

        if (!info)
                return USB_STOR_TRANSPORT_ERROR;

        memcpy(command, scommand, 8);
        buf = kmalloc(512, GFP_NOIO);
        if (!buf)
                return USB_STOR_TRANSPORT_ERROR;

        US_DEBUGP("datafab_determine_lun:  locating...\n");

        // we'll try 3 times before giving up...
        //
        while (count++ < 3) {
                command[5] = 0xa0;

                rc = datafab_bulk_write(us, command, 8);
                if (rc != USB_STOR_XFER_GOOD) {
                        rc = USB_STOR_TRANSPORT_ERROR;
                        goto leave;
                }

                rc = datafab_bulk_read(us, buf, 512);
                if (rc == USB_STOR_XFER_GOOD) {
                        info->lun = 0;
                        rc = USB_STOR_TRANSPORT_GOOD;
                        goto leave;
                }

                command[5] = 0xb0;

                rc = datafab_bulk_write(us, command, 8);
                if (rc != USB_STOR_XFER_GOOD) {
                        rc = USB_STOR_TRANSPORT_ERROR;
                        goto leave;
                }

                rc = datafab_bulk_read(us, buf, 512);
                if (rc == USB_STOR_XFER_GOOD) {
                        info->lun = 1;
                        rc = USB_STOR_TRANSPORT_GOOD;
                        goto leave;
                }

                msleep(20);
        }

        rc = USB_STOR_TRANSPORT_ERROR;

 leave:
        kfree(buf);
        return rc;
}

static int datafab_id_device(struct us_data *us,
                             struct datafab_info *info)
{
        // this is a variation of the ATA "IDENTIFY DEVICE" command...according
        // to the ATA spec, 'Sector Count' isn't used but the Windows driver
        // sets this bit so we do too...
        //
        static unsigned char scommand[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 };
        unsigned char *command = us->iobuf;
        unsigned char *reply;
        int rc;

        if (!info)
                return USB_STOR_TRANSPORT_ERROR;

        if (info->lun == -1) {
                rc = datafab_determine_lun(us, info);
                if (rc != USB_STOR_TRANSPORT_GOOD)
                        return rc;
        }

        memcpy(command, scommand, 8);
        reply = kmalloc(512, GFP_NOIO);
        if (!reply)
                return USB_STOR_TRANSPORT_ERROR;

        command[5] += (info->lun << 4);

        rc = datafab_bulk_write(us, command, 8);
        if (rc != USB_STOR_XFER_GOOD) {
                rc = USB_STOR_TRANSPORT_ERROR;
                goto leave;
        }

        // we'll go ahead and extract the media capacity while we're here...
        //
        rc = datafab_bulk_read(us, reply, 512);
        if (rc == USB_STOR_XFER_GOOD) {
                // capacity is at word offset 57-58
                //
                info->sectors = ((u32)(reply[117]) << 24) | 
                                ((u32)(reply[116]) << 16) |
                                ((u32)(reply[115]) <<  8) | 
                                ((u32)(reply[114])      );
                rc = USB_STOR_TRANSPORT_GOOD;
                goto leave;
        }

        rc = USB_STOR_TRANSPORT_ERROR;

 leave:
        kfree(reply);
        return rc;
}


static int datafab_handle_mode_sense(struct us_data *us,
                                     struct scsi_cmnd * srb, 
                                     int sense_6)
{
        static unsigned char rw_err_page[12] = {
                0x1, 0xA, 0x21, 1, 0, 0, 0, 0, 1, 0, 0, 0
        };
        static unsigned char cache_page[12] = {
                0x8, 0xA, 0x1, 0, 0, 0, 0, 0, 0, 0, 0, 0
        };
        static unsigned char rbac_page[12] = {
                0x1B, 0xA, 0, 0x81, 0, 0, 0, 0, 0, 0, 0, 0
        };
        static unsigned char timer_page[8] = {
                0x1C, 0x6, 0, 0, 0, 0
        };
        unsigned char pc, page_code;
        unsigned int i = 0;
        struct datafab_info *info = (struct datafab_info *) (us->extra);
        unsigned char *ptr = us->iobuf;

        // most of this stuff is just a hack to get things working.  the
        // datafab reader doesn't present a SCSI interface so we
        // fudge the SCSI commands...
        //

        pc = srb->cmnd[2] >> 6;
        page_code = srb->cmnd[2] & 0x3F;

        switch (pc) {
           case 0x0:
                US_DEBUGP("datafab_handle_mode_sense:  Current values\n");
                break;
           case 0x1:
                US_DEBUGP("datafab_handle_mode_sense:  Changeable values\n");
                break;
           case 0x2:
                US_DEBUGP("datafab_handle_mode_sense:  Default values\n");
                break;
           case 0x3:
                US_DEBUGP("datafab_handle_mode_sense:  Saves values\n");
                break;
        }

        memset(ptr, 0, 8);
        if (sense_6) {
                ptr[2] = 0x00;          // WP enable: 0x80
                i = 4;
        } else {
                ptr[3] = 0x00;          // WP enable: 0x80
                i = 8;
        }

        switch (page_code) {
           default:
                // vendor-specific mode
                info->sense_key = 0x05;
                info->sense_asc = 0x24;
                info->sense_ascq = 0x00;
                return USB_STOR_TRANSPORT_FAILED;

           case 0x1:
                memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
                i += sizeof(rw_err_page);
                break;

           case 0x8:
                memcpy(ptr + i, cache_page, sizeof(cache_page));
                i += sizeof(cache_page);
                break;

           case 0x1B:
                memcpy(ptr + i, rbac_page, sizeof(rbac_page));
                i += sizeof(rbac_page);
                break;

           case 0x1C:
                memcpy(ptr + i, timer_page, sizeof(timer_page));
                i += sizeof(timer_page);
                break;

           case 0x3F:           // retrieve all pages
                memcpy(ptr + i, timer_page, sizeof(timer_page));
                i += sizeof(timer_page);
                memcpy(ptr + i, rbac_page, sizeof(rbac_page));
                i += sizeof(rbac_page);
                memcpy(ptr + i, cache_page, sizeof(cache_page));
                i += sizeof(cache_page);
                memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
                i += sizeof(rw_err_page);
                break;
        }

        if (sense_6)
                ptr[0] = i - 1;
        else
                ((__be16 *) ptr)[0] = cpu_to_be16(i - 2);
        usb_stor_set_xfer_buf(ptr, i, srb);

        return USB_STOR_TRANSPORT_GOOD;
}

static void datafab_info_destructor(void *extra)
{
        // this routine is a placeholder...
        // currently, we don't allocate any extra memory so we're okay
}


// Transport for the Datafab MDCFE-B
//
static int datafab_transport(struct scsi_cmnd *srb, struct us_data *us)
{
        struct datafab_info *info;
        int rc;
        unsigned long block, blocks;
        unsigned char *ptr = us->iobuf;
        static unsigned char inquiry_reply[8] = {
                0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
        };

        if (!us->extra) {
                us->extra = kzalloc(sizeof(struct datafab_info), GFP_NOIO);
                if (!us->extra) {
                        US_DEBUGP("datafab_transport:  Gah! "
                                  "Can't allocate storage for Datafab info struct!\n");
                        return USB_STOR_TRANSPORT_ERROR;
                }
                us->extra_destructor = datafab_info_destructor;
                ((struct datafab_info *)us->extra)->lun = -1;
        }

        info = (struct datafab_info *) (us->extra);

        if (srb->cmnd[0] == INQUIRY) {
                US_DEBUGP("datafab_transport:  INQUIRY.  Returning bogus response");
                memcpy(ptr, inquiry_reply, sizeof(inquiry_reply));
                fill_inquiry_response(us, ptr, 36);
                return USB_STOR_TRANSPORT_GOOD;
        }

        if (srb->cmnd[0] == READ_CAPACITY) {
                info->ssize = 0x200;  // hard coded 512 byte sectors as per ATA spec
                rc = datafab_id_device(us, info);
                if (rc != USB_STOR_TRANSPORT_GOOD)
                        return rc;

                US_DEBUGP("datafab_transport:  READ_CAPACITY:  %ld sectors, %ld bytes per sector\n",
                          info->sectors, info->ssize);

                // build the reply
                // we need the last sector, not the number of sectors
                ((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);
                ((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);
                usb_stor_set_xfer_buf(ptr, 8, srb);

                return USB_STOR_TRANSPORT_GOOD;
        }

        if (srb->cmnd[0] == MODE_SELECT_10) {
                US_DEBUGP("datafab_transport:  Gah! MODE_SELECT_10.\n");
                return USB_STOR_TRANSPORT_ERROR;
        }

        // don't bother implementing READ_6 or WRITE_6.
        //
        if (srb->cmnd[0] == READ_10) {
                block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

                blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

                US_DEBUGP("datafab_transport:  READ_10: read block 0x%04lx  count %ld\n", block, blocks);
                return datafab_read_data(us, info, block, blocks);
        }

        if (srb->cmnd[0] == READ_12) {
                // we'll probably never see a READ_12 but we'll do it anyway...
                //
                block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

                blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
                         ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

                US_DEBUGP("datafab_transport:  READ_12: read block 0x%04lx  count %ld\n", block, blocks);
                return datafab_read_data(us, info, block, blocks);
        }

        if (srb->cmnd[0] == WRITE_10) {
                block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

                blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));

                US_DEBUGP("datafab_transport:  WRITE_10: write block 0x%04lx  count %ld\n", block, blocks);
                return datafab_write_data(us, info, block, blocks);
        }

        if (srb->cmnd[0] == WRITE_12) {
                // we'll probably never see a WRITE_12 but we'll do it anyway...
                //
                block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |
                        ((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));

                blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |
                         ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));

                US_DEBUGP("datafab_transport:  WRITE_12: write block 0x%04lx  count %ld\n", block, blocks);
                return datafab_write_data(us, info, block, blocks);
        }

        if (srb->cmnd[0] == TEST_UNIT_READY) {
                US_DEBUGP("datafab_transport:  TEST_UNIT_READY.\n");
                return datafab_id_device(us, info);
        }

        if (srb->cmnd[0] == REQUEST_SENSE) {
                US_DEBUGP("datafab_transport:  REQUEST_SENSE.  Returning faked response\n");

                // this response is pretty bogus right now.  eventually if necessary
                // we can set the correct sense data.  so far though it hasn't been
                // necessary
                //
                memset(ptr, 0, 18);
                ptr[0] = 0xF0;
                ptr[2] = info->sense_key;
                ptr[7] = 11;
                ptr[12] = info->sense_asc;
                ptr[13] = info->sense_ascq;
                usb_stor_set_xfer_buf(ptr, 18, srb);

                return USB_STOR_TRANSPORT_GOOD;
        }

        if (srb->cmnd[0] == MODE_SENSE) {
                US_DEBUGP("datafab_transport:  MODE_SENSE_6 detected\n");
                return datafab_handle_mode_sense(us, srb, 1);
        }

        if (srb->cmnd[0] == MODE_SENSE_10) {
                US_DEBUGP("datafab_transport:  MODE_SENSE_10 detected\n");
                return datafab_handle_mode_sense(us, srb, 0);
        }

        if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
                // sure.  whatever.  not like we can stop the user from
                // popping the media out of the device (no locking doors, etc)
                //
                return USB_STOR_TRANSPORT_GOOD;
        }

        if (srb->cmnd[0] == START_STOP) {
                /* this is used by sd.c'check_scsidisk_media_change to detect
                   media change */
                US_DEBUGP("datafab_transport:  START_STOP.\n");
                /* the first datafab_id_device after a media change returns
                   an error (determined experimentally) */
                rc = datafab_id_device(us, info);
                if (rc == USB_STOR_TRANSPORT_GOOD) {
                        info->sense_key = NO_SENSE;
                        srb->result = SUCCESS;
                } else {
                        info->sense_key = UNIT_ATTENTION;
                        srb->result = SAM_STAT_CHECK_CONDITION;
                }
                return rc;
        }

        US_DEBUGP("datafab_transport:  Gah! Unknown command: %d (0x%x)\n",
                  srb->cmnd[0], srb->cmnd[0]);
        info->sense_key = 0x05;
        info->sense_asc = 0x20;
        info->sense_ascq = 0x00;
        return USB_STOR_TRANSPORT_FAILED;
}

static int datafab_probe(struct usb_interface *intf,
                         const struct usb_device_id *id)
{
        struct us_data *us;
        int result;

        result = usb_stor_probe1(&us, intf, id,
                        (id - datafab_usb_ids) + datafab_unusual_dev_list);
        if (result)
                return result;

        us->transport_name  = "Datafab Bulk-Only";
        us->transport = datafab_transport;
        us->transport_reset = usb_stor_Bulk_reset;
        us->max_lun = 1;

        result = usb_stor_probe2(us);
        return result;
}

static struct usb_driver datafab_driver = {
        .name =         "ums-datafab",
        .probe =        datafab_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 =     datafab_usb_ids,
        .soft_unbind =  1,
        .no_dynamic_id = 1,
};

module_usb_driver(datafab_driver);