drivers/usb/storage/freecom.c - android_kernel_lge_hammerhead - Gitiles

 /* Driver for Freecom USB/IDE adaptor
  *
  * $Id: freecom.c,v 1.22 2002/04/22 03:39:43 mdharm Exp $
  *
  * Freecom v0.1:
  *
  * First release
  *
  * Current development and maintenance by:
  *   (C) 2000 David Brown <usb-storage@davidb.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 was developed with information provided in FREECOM's USB
  * Programmers Reference Guide.  For further information contact Freecom
  * (http://www.freecom.de/)
  */

 #include <linux/config.h>
 #include <linux/hdreg.h>

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

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

 #ifdef CONFIG_USB_STORAGE_DEBUG
 static void pdump (void *, int);
 #endif

 /* Bits of HD_STATUS */
 #define ERR_STAT		0x01
 #define DRQ_STAT		0x08

 /* All of the outgoing packets are 64 bytes long. */
 struct freecom_cb_wrap {
 	u8    Type;		/* Command type. */
 	u8    Timeout;		/* Timeout in seconds. */
 	u8    Atapi[12];	/* An ATAPI packet. */
 	u8    Filler[50];	/* Padding Data. */
 };

 struct freecom_xfer_wrap {
 	u8    Type;		/* Command type. */
 	u8    Timeout;		/* Timeout in seconds. */
 	__le32   Count;		/* Number of bytes to transfer. */
 	u8    Pad[58];
 } __attribute__ ((packed));

 struct freecom_ide_out {
 	u8    Type;		/* Type + IDE register. */
 	u8    Pad;
 	__le16   Value;		/* Value to write. */
 	u8    Pad2[60];
 };

 struct freecom_ide_in {
 	u8    Type;		/* Type | IDE register. */
 	u8    Pad[63];
 };

 struct freecom_status {
 	u8    Status;
 	u8    Reason;
 	__le16   Count;
 	u8    Pad[60];
 };

 /* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
  * register. */
 #define FCM_INT_STATUS		0x02 /* INDEX_STAT */
 #define FCM_STATUS_BUSY		0x80

 /* These are the packet types.  The low bit indicates that this command
  * should wait for an interrupt. */
 #define FCM_PACKET_ATAPI	0x21
 #define FCM_PACKET_STATUS	0x20

 /* Receive data from the IDE interface.  The ATAPI packet has already
  * waited, so the data should be immediately available. */
 #define FCM_PACKET_INPUT	0x81

 /* Send data to the IDE interface. */
 #define FCM_PACKET_OUTPUT	0x01

 /* Write a value to an ide register.  Or the ide register to write after
  * munging the address a bit. */
 #define FCM_PACKET_IDE_WRITE	0x40
 #define FCM_PACKET_IDE_READ	0xC0

 /* All packets (except for status) are 64 bytes long. */
 #define FCM_PACKET_LENGTH		64
 #define FCM_STATUS_PACKET_LENGTH	4

 static int
 freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
 		unsigned int ipipe, unsigned int opipe, int count)
 {
 	struct freecom_xfer_wrap *fxfr =
 		(struct freecom_xfer_wrap *) us->iobuf;
 	int result;

 	fxfr->Type = FCM_PACKET_INPUT | 0x00;
 	fxfr->Timeout = 0;    /* Short timeout for debugging. */
 	fxfr->Count = cpu_to_le32 (count);
 	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));

 	US_DEBUGP("Read data Freecom! (c=%d)\n", count);

 	/* Issue the transfer command. */
 	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
 			FCM_PACKET_LENGTH, NULL);
 	if (result != USB_STOR_XFER_GOOD) {
 		US_DEBUGP ("Freecom readdata transport error\n");
 		return USB_STOR_TRANSPORT_ERROR;
 	}

 	/* Now transfer all of our blocks. */
 	US_DEBUGP("Start of read\n");
 	result = usb_stor_bulk_transfer_sg(us, ipipe, srb->request_buffer,
 			count, srb->use_sg, &srb->resid);
 	US_DEBUGP("freecom_readdata done!\n");

 	if (result > USB_STOR_XFER_SHORT)
 		return USB_STOR_TRANSPORT_ERROR;
 	return USB_STOR_TRANSPORT_GOOD;
 }

 static int
 freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
 		int unsigned ipipe, unsigned int opipe, int count)
 {
 	struct freecom_xfer_wrap *fxfr =
 		(struct freecom_xfer_wrap *) us->iobuf;
 	int result;

 	fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
 	fxfr->Timeout = 0;    /* Short timeout for debugging. */
 	fxfr->Count = cpu_to_le32 (count);
 	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));

 	US_DEBUGP("Write data Freecom! (c=%d)\n", count);

 	/* Issue the transfer command. */
 	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
 			FCM_PACKET_LENGTH, NULL);
 	if (result != USB_STOR_XFER_GOOD) {
 		US_DEBUGP ("Freecom writedata transport error\n");
 		return USB_STOR_TRANSPORT_ERROR;
 	}

 	/* Now transfer all of our blocks. */
 	US_DEBUGP("Start of write\n");
 	result = usb_stor_bulk_transfer_sg(us, opipe, srb->request_buffer,
 			count, srb->use_sg, &srb->resid);

 	US_DEBUGP("freecom_writedata done!\n");
 	if (result > USB_STOR_XFER_SHORT)
 		return USB_STOR_TRANSPORT_ERROR;
 	return USB_STOR_TRANSPORT_GOOD;
 }

 /*
  * Transport for the Freecom USB/IDE adaptor.
  *
  */
 int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
 {
 	struct freecom_cb_wrap *fcb;
 	struct freecom_status  *fst;
 	unsigned int ipipe, opipe;		/* We need both pipes. */
 	int result;
 	unsigned int partial;
 	int length;

 	fcb = (struct freecom_cb_wrap *) us->iobuf;
 	fst = (struct freecom_status *) us->iobuf;

 	US_DEBUGP("Freecom TRANSPORT STARTED\n");

 	/* Get handles for both transports. */
 	opipe = us->send_bulk_pipe;
 	ipipe = us->recv_bulk_pipe;

 	/* The ATAPI Command always goes out first. */
 	fcb->Type = FCM_PACKET_ATAPI | 0x00;
 	fcb->Timeout = 0;
 	memcpy (fcb->Atapi, srb->cmnd, 12);
 	memset (fcb->Filler, 0, sizeof (fcb->Filler));

 	US_DEBUG(pdump (srb->cmnd, 12));

 	/* Send it out. */
 	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
 			FCM_PACKET_LENGTH, NULL);

 	/* The Freecom device will only fail if there is something wrong in
 	 * USB land.  It returns the status in its own registers, which
 	 * come back in the bulk pipe. */
 	if (result != USB_STOR_XFER_GOOD) {
 		US_DEBUGP ("freecom transport error\n");
 		return USB_STOR_TRANSPORT_ERROR;
 	}

 	/* There are times we can optimize out this status read, but it
 	 * doesn't hurt us to always do it now. */
 	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 			FCM_STATUS_PACKET_LENGTH, &partial);
 	US_DEBUGP("foo Status result %d %u\n", result, partial);
 	if (result != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;

 	US_DEBUG(pdump ((void *) fst, partial));

 	/* The firmware will time-out commands after 20 seconds. Some commands
 	 * can legitimately take longer than this, so we use a different
 	 * command that only waits for the interrupt and then sends status,
 	 * without having to send a new ATAPI command to the device.
 	 *
 	 * NOTE: There is some indication that a data transfer after a timeout
 	 * may not work, but that is a condition that should never happen.
 	 */
 	while (fst->Status & FCM_STATUS_BUSY) {
 		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
 		US_DEBUGP("fst->Status is %x\n", fst->Status);

 		/* Get the status again */
 		fcb->Type = FCM_PACKET_STATUS;
 		fcb->Timeout = 0;
 		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
 		memset (fcb->Filler, 0, sizeof (fcb->Filler));

 		/* Send it out. */
 		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
 				FCM_PACKET_LENGTH, NULL);

 		/* The Freecom device will only fail if there is something
 		 * wrong in USB land.  It returns the status in its own
 		 * registers, which come back in the bulk pipe.
 		 */
 		if (result != USB_STOR_XFER_GOOD) {
 			US_DEBUGP ("freecom transport error\n");
 			return USB_STOR_TRANSPORT_ERROR;
 		}

 		/* get the data */
 		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 				FCM_STATUS_PACKET_LENGTH, &partial);

 		US_DEBUGP("bar Status result %d %u\n", result, partial);
 		if (result != USB_STOR_XFER_GOOD)
 			return USB_STOR_TRANSPORT_ERROR;

 		US_DEBUG(pdump ((void *) fst, partial));
 	}

 	if (partial != 4)
 		return USB_STOR_TRANSPORT_ERROR;
 	if ((fst->Status & 1) != 0) {
 		US_DEBUGP("operation failed\n");
 		return USB_STOR_TRANSPORT_FAILED;
 	}

 	/* The device might not have as much data available as we
 	 * requested.  If you ask for more than the device has, this reads
 	 * and such will hang. */
 	US_DEBUGP("Device indicates that it has %d bytes available\n",
 			le16_to_cpu (fst->Count));
 	US_DEBUGP("SCSI requested %d\n", srb->request_bufflen);

 	/* Find the length we desire to read. */
 	switch (srb->cmnd[0]) {
 		case INQUIRY:
 		case REQUEST_SENSE:		/* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
 		case MODE_SENSE:
 		case MODE_SENSE_10:
 			length = le16_to_cpu(fst->Count);
 			break;
 		default:
  			length = srb->request_bufflen;
 	}

 	/* verify that this amount is legal */
 	if (length > srb->request_bufflen) {
 		length = srb->request_bufflen;
 		US_DEBUGP("Truncating request to match buffer length: %d\n", length);
 	}

 	/* What we do now depends on what direction the data is supposed to
 	 * move in. */

 	switch (us->srb->sc_data_direction) {
 	case DMA_FROM_DEVICE:
 		/* catch bogus "read 0 length" case */
 		if (!length)
 			break;
 		/* Make sure that the status indicates that the device
 		 * wants data as well. */
 		if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
 			US_DEBUGP("SCSI wants data, drive doesn't have any\n");
 			return USB_STOR_TRANSPORT_FAILED;
 		}
 		result = freecom_readdata (srb, us, ipipe, opipe, length);
 		if (result != USB_STOR_TRANSPORT_GOOD)
 			return result;

 		US_DEBUGP("FCM: Waiting for status\n");
 		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 				FCM_PACKET_LENGTH, &partial);
 		US_DEBUG(pdump ((void *) fst, partial));

 		if (partial != 4 || result > USB_STOR_XFER_SHORT)
 			return USB_STOR_TRANSPORT_ERROR;
 		if ((fst->Status & ERR_STAT) != 0) {
 			US_DEBUGP("operation failed\n");
 			return USB_STOR_TRANSPORT_FAILED;
 		}
 		if ((fst->Reason & 3) != 3) {
 			US_DEBUGP("Drive seems still hungry\n");
 			return USB_STOR_TRANSPORT_FAILED;
 		}
 		US_DEBUGP("Transfer happy\n");
 		break;

 	case DMA_TO_DEVICE:
 		/* catch bogus "write 0 length" case */
 		if (!length)
 			break;
 		/* Make sure the status indicates that the device wants to
 		 * send us data. */
 		/* !!IMPLEMENT!! */
 		result = freecom_writedata (srb, us, ipipe, opipe, length);
 		if (result != USB_STOR_TRANSPORT_GOOD)
 			return result;

 		US_DEBUGP("FCM: Waiting for status\n");
 		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
 				FCM_PACKET_LENGTH, &partial);

 		if (partial != 4 || result > USB_STOR_XFER_SHORT)
 			return USB_STOR_TRANSPORT_ERROR;
 		if ((fst->Status & ERR_STAT) != 0) {
 			US_DEBUGP("operation failed\n");
 			return USB_STOR_TRANSPORT_FAILED;
 		}
 		if ((fst->Reason & 3) != 3) {
 			US_DEBUGP("Drive seems still hungry\n");
 			return USB_STOR_TRANSPORT_FAILED;
 		}

 		US_DEBUGP("Transfer happy\n");
 		break;


 	case DMA_NONE:
 		/* Easy, do nothing. */
 		break;

 	default:
 		/* should never hit here -- filtered in usb.c */
 		US_DEBUGP ("freecom unimplemented direction: %d\n",
 				us->srb->sc_data_direction);
 		// Return fail, SCSI seems to handle this better.
 		return USB_STOR_TRANSPORT_FAILED;
 		break;
 	}

 	return USB_STOR_TRANSPORT_GOOD;
 }

 int
 freecom_init (struct us_data *us)
 {
 	int result;
 	char *buffer = us->iobuf;

 	/* The DMA-mapped I/O buffer is 64 bytes long, just right for
 	 * all our packets.  No need to allocate any extra buffer space.
 	 */

 	result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
 			0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
 	buffer[32] = '\0';
 	US_DEBUGP("String returned from FC init is: %s\n", buffer);

 	/* Special thanks to the people at Freecom for providing me with
 	 * this "magic sequence", which they use in their Windows and MacOS
 	 * drivers to make sure that all the attached perhiperals are
 	 * properly reset.
 	 */

 	/* send reset */
 	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 			0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
 	US_DEBUGP("result from activate reset is %d\n", result);

 	/* wait 250ms */
 	mdelay(250);

 	/* clear reset */
 	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 			0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
 	US_DEBUGP("result from clear reset is %d\n", result);

 	/* wait 3 seconds */
 	mdelay(3 * 1000);

 	return USB_STOR_TRANSPORT_GOOD;
 }

 int usb_stor_freecom_reset(struct us_data *us)
 {
 	printk (KERN_CRIT "freecom reset called\n");

 	/* We don't really have this feature. */
 	return FAILED;
 }

 #ifdef CONFIG_USB_STORAGE_DEBUG
 static void pdump (void *ibuffer, int length)
 {
 	static char line[80];
 	int offset = 0;
 	unsigned char *buffer = (unsigned char *) ibuffer;
 	int i, j;
 	int from, base;

 	offset = 0;
 	for (i = 0; i < length; i++) {
 		if ((i & 15) == 0) {
 			if (i > 0) {
 				offset += sprintf (line+offset, " - ");
 				for (j = i - 16; j < i; j++) {
 					if (buffer[j] >= 32 && buffer[j] <= 126)
 						line[offset++] = buffer[j];
 					else
 						line[offset++] = '.';
 				}
 				line[offset] = 0;
 				US_DEBUGP("%s\n", line);
 				offset = 0;
 			}
 			offset += sprintf (line+offset, "%08x:", i);
 		}
 		else if ((i & 7) == 0) {
 			offset += sprintf (line+offset, " -");
 		}
 		offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
 	}

 	/* Add the last "chunk" of data. */
 	from = (length - 1) % 16;
 	base = ((length - 1) / 16) * 16;

 	for (i = from + 1; i < 16; i++)
 		offset += sprintf (line+offset, "   ");
 	if (from < 8)
 		offset += sprintf (line+offset, "  ");
 	offset += sprintf (line+offset, " - ");

 	for (i = 0; i <= from; i++) {
 		if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
 			line[offset++] = buffer[base+i];
 		else
 			line[offset++] = '.';
 	}
 	line[offset] = 0;
 	US_DEBUGP("%s\n", line);
 	offset = 0;
 }
 #endif
	/* Driver for Freecom USB/IDE adaptor
	*
	* $Id: freecom.c,v 1.22 2002/04/22 03:39:43 mdharm Exp $
	*
	* Freecom v0.1:
	*
	* First release
	*
	* Current development and maintenance by:
	* (C) 2000 David Brown <usb-storage@davidb.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 was developed with information provided in FREECOM's USB
	* Programmers Reference Guide. For further information contact Freecom
	* (http://www.freecom.de/)
	*/

	#include <linux/config.h>
	#include <linux/hdreg.h>

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

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

	#ifdef CONFIG_USB_STORAGE_DEBUG
	static void pdump (void *, int);
	#endif

	/* Bits of HD_STATUS */
	#define ERR_STAT 0x01
	#define DRQ_STAT 0x08

	/* All of the outgoing packets are 64 bytes long. */
	struct freecom_cb_wrap {
	u8 Type; /* Command type. */
	u8 Timeout; /* Timeout in seconds. */
	u8 Atapi[12]; /* An ATAPI packet. */
	u8 Filler[50]; /* Padding Data. */
	};

	struct freecom_xfer_wrap {
	u8 Type; /* Command type. */
	u8 Timeout; /* Timeout in seconds. */
	__le32 Count; /* Number of bytes to transfer. */
	u8 Pad[58];
	} __attribute__ ((packed));

	struct freecom_ide_out {
	u8 Type; /* Type + IDE register. */
	u8 Pad;
	__le16 Value; /* Value to write. */
	u8 Pad2[60];
	};

	struct freecom_ide_in {
	u8 Type; /* Type \| IDE register. */
	u8 Pad[63];
	};

	struct freecom_status {
	u8 Status;
	u8 Reason;
	__le16 Count;
	u8 Pad[60];
	};

	/* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
	* register. */
	#define FCM_INT_STATUS 0x02 /* INDEX_STAT */
	#define FCM_STATUS_BUSY 0x80

	/* These are the packet types. The low bit indicates that this command
	* should wait for an interrupt. */
	#define FCM_PACKET_ATAPI 0x21
	#define FCM_PACKET_STATUS 0x20

	/* Receive data from the IDE interface. The ATAPI packet has already
	* waited, so the data should be immediately available. */
	#define FCM_PACKET_INPUT 0x81

	/* Send data to the IDE interface. */
	#define FCM_PACKET_OUTPUT 0x01

	/* Write a value to an ide register. Or the ide register to write after
	* munging the address a bit. */
	#define FCM_PACKET_IDE_WRITE 0x40
	#define FCM_PACKET_IDE_READ 0xC0

	/* All packets (except for status) are 64 bytes long. */
	#define FCM_PACKET_LENGTH 64
	#define FCM_STATUS_PACKET_LENGTH 4

	static int
	freecom_readdata (struct scsi_cmnd srb, struct us_data us,
	unsigned int ipipe, unsigned int opipe, int count)
	{
	struct freecom_xfer_wrap *fxfr =
	(struct freecom_xfer_wrap *) us->iobuf;
	int result;

	fxfr->Type = FCM_PACKET_INPUT \| 0x00;
	fxfr->Timeout = 0; /* Short timeout for debugging. */
	fxfr->Count = cpu_to_le32 (count);
	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));

	US_DEBUGP("Read data Freecom! (c=%d)\n", count);

	/* Issue the transfer command. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
	FCM_PACKET_LENGTH, NULL);
	if (result != USB_STOR_XFER_GOOD) {
	US_DEBUGP ("Freecom readdata transport error\n");
	return USB_STOR_TRANSPORT_ERROR;
	}

	/* Now transfer all of our blocks. */
	US_DEBUGP("Start of read\n");
	result = usb_stor_bulk_transfer_sg(us, ipipe, srb->request_buffer,
	count, srb->use_sg, &srb->resid);
	US_DEBUGP("freecom_readdata done!\n");

	if (result > USB_STOR_XFER_SHORT)
	return USB_STOR_TRANSPORT_ERROR;
	return USB_STOR_TRANSPORT_GOOD;
	}

	static int
	freecom_writedata (struct scsi_cmnd srb, struct us_data us,
	int unsigned ipipe, unsigned int opipe, int count)
	{
	struct freecom_xfer_wrap *fxfr =
	(struct freecom_xfer_wrap *) us->iobuf;
	int result;

	fxfr->Type = FCM_PACKET_OUTPUT \| 0x00;
	fxfr->Timeout = 0; /* Short timeout for debugging. */
	fxfr->Count = cpu_to_le32 (count);
	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));

	US_DEBUGP("Write data Freecom! (c=%d)\n", count);

	/* Issue the transfer command. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
	FCM_PACKET_LENGTH, NULL);
	if (result != USB_STOR_XFER_GOOD) {
	US_DEBUGP ("Freecom writedata transport error\n");
	return USB_STOR_TRANSPORT_ERROR;
	}

	/* Now transfer all of our blocks. */
	US_DEBUGP("Start of write\n");
	result = usb_stor_bulk_transfer_sg(us, opipe, srb->request_buffer,
	count, srb->use_sg, &srb->resid);

	US_DEBUGP("freecom_writedata done!\n");
	if (result > USB_STOR_XFER_SHORT)
	return USB_STOR_TRANSPORT_ERROR;
	return USB_STOR_TRANSPORT_GOOD;
	}

	/*
	* Transport for the Freecom USB/IDE adaptor.
	*
	*/
	int freecom_transport(struct scsi_cmnd srb, struct us_data us)
	{
	struct freecom_cb_wrap *fcb;
	struct freecom_status *fst;
	unsigned int ipipe, opipe; /* We need both pipes. */
	int result;
	unsigned int partial;
	int length;

	fcb = (struct freecom_cb_wrap *) us->iobuf;
	fst = (struct freecom_status *) us->iobuf;

	US_DEBUGP("Freecom TRANSPORT STARTED\n");

	/* Get handles for both transports. */
	opipe = us->send_bulk_pipe;
	ipipe = us->recv_bulk_pipe;

	/* The ATAPI Command always goes out first. */
	fcb->Type = FCM_PACKET_ATAPI \| 0x00;
	fcb->Timeout = 0;
	memcpy (fcb->Atapi, srb->cmnd, 12);
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	US_DEBUG(pdump (srb->cmnd, 12));

	/* Send it out. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
	FCM_PACKET_LENGTH, NULL);

	/* The Freecom device will only fail if there is something wrong in
	* USB land. It returns the status in its own registers, which
	* come back in the bulk pipe. */
	if (result != USB_STOR_XFER_GOOD) {
	US_DEBUGP ("freecom transport error\n");
	return USB_STOR_TRANSPORT_ERROR;
	}

	/* There are times we can optimize out this status read, but it
	* doesn't hurt us to always do it now. */
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
	FCM_STATUS_PACKET_LENGTH, &partial);
	US_DEBUGP("foo Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
	return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));

	/* The firmware will time-out commands after 20 seconds. Some commands
	* can legitimately take longer than this, so we use a different
	* command that only waits for the interrupt and then sends status,
	* without having to send a new ATAPI command to the device.
	*
	* NOTE: There is some indication that a data transfer after a timeout
	* may not work, but that is a condition that should never happen.
	*/
	while (fst->Status & FCM_STATUS_BUSY) {
	US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
	US_DEBUGP("fst->Status is %x\n", fst->Status);

	/* Get the status again */
	fcb->Type = FCM_PACKET_STATUS;
	fcb->Timeout = 0;
	memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	/* Send it out. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
	FCM_PACKET_LENGTH, NULL);

	/* The Freecom device will only fail if there is something
	* wrong in USB land. It returns the status in its own
	* registers, which come back in the bulk pipe.
	*/
	if (result != USB_STOR_XFER_GOOD) {
	US_DEBUGP ("freecom transport error\n");
	return USB_STOR_TRANSPORT_ERROR;
	}

	/* get the data */
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
	FCM_STATUS_PACKET_LENGTH, &partial);

	US_DEBUGP("bar Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
	return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));
	}

	if (partial != 4)
	return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & 1) != 0) {
	US_DEBUGP("operation failed\n");
	return USB_STOR_TRANSPORT_FAILED;
	}

	/* The device might not have as much data available as we
	* requested. If you ask for more than the device has, this reads
	* and such will hang. */
	US_DEBUGP("Device indicates that it has %d bytes available\n",
	le16_to_cpu (fst->Count));
	US_DEBUGP("SCSI requested %d\n", srb->request_bufflen);

	/* Find the length we desire to read. */
	switch (srb->cmnd[0]) {
	case INQUIRY:
	case REQUEST_SENSE: /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
	case MODE_SENSE:
	case MODE_SENSE_10:
	length = le16_to_cpu(fst->Count);
	break;
	default:
	length = srb->request_bufflen;
	}

	/* verify that this amount is legal */
	if (length > srb->request_bufflen) {
	length = srb->request_bufflen;
	US_DEBUGP("Truncating request to match buffer length: %d\n", length);
	}

	/* What we do now depends on what direction the data is supposed to
	* move in. */

	switch (us->srb->sc_data_direction) {
	case DMA_FROM_DEVICE:
	/* catch bogus "read 0 length" case */
	if (!length)
	break;
	/* Make sure that the status indicates that the device
	* wants data as well. */
	if ((fst->Status & DRQ_STAT) == 0 \|\| (fst->Reason & 3) != 2) {
	US_DEBUGP("SCSI wants data, drive doesn't have any\n");
	return USB_STOR_TRANSPORT_FAILED;
	}
	result = freecom_readdata (srb, us, ipipe, opipe, length);
	if (result != USB_STOR_TRANSPORT_GOOD)
	return result;

	US_DEBUGP("FCM: Waiting for status\n");
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
	FCM_PACKET_LENGTH, &partial);
	US_DEBUG(pdump ((void *) fst, partial));

	if (partial != 4 \|\| result > USB_STOR_XFER_SHORT)
	return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & ERR_STAT) != 0) {
	US_DEBUGP("operation failed\n");
	return USB_STOR_TRANSPORT_FAILED;
	}
	if ((fst->Reason & 3) != 3) {
	US_DEBUGP("Drive seems still hungry\n");
	return USB_STOR_TRANSPORT_FAILED;
	}
	US_DEBUGP("Transfer happy\n");
	break;

	case DMA_TO_DEVICE:
	/* catch bogus "write 0 length" case */
	if (!length)
	break;
	/* Make sure the status indicates that the device wants to
	* send us data. */
	/* !!IMPLEMENT!! */
	result = freecom_writedata (srb, us, ipipe, opipe, length);
	if (result != USB_STOR_TRANSPORT_GOOD)
	return result;

	US_DEBUGP("FCM: Waiting for status\n");
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
	FCM_PACKET_LENGTH, &partial);

	if (partial != 4 \|\| result > USB_STOR_XFER_SHORT)
	return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & ERR_STAT) != 0) {
	US_DEBUGP("operation failed\n");
	return USB_STOR_TRANSPORT_FAILED;
	}
	if ((fst->Reason & 3) != 3) {
	US_DEBUGP("Drive seems still hungry\n");
	return USB_STOR_TRANSPORT_FAILED;
	}

	US_DEBUGP("Transfer happy\n");
	break;


	case DMA_NONE:
	/* Easy, do nothing. */
	break;

	default:
	/* should never hit here -- filtered in usb.c */
	US_DEBUGP ("freecom unimplemented direction: %d\n",
	us->srb->sc_data_direction);
	// Return fail, SCSI seems to handle this better.
	return USB_STOR_TRANSPORT_FAILED;
	break;
	}

	return USB_STOR_TRANSPORT_GOOD;
	}

	int
	freecom_init (struct us_data *us)
	{
	int result;
	char *buffer = us->iobuf;

	/* The DMA-mapped I/O buffer is 64 bytes long, just right for
	* all our packets. No need to allocate any extra buffer space.
	*/

	result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
	0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
	buffer[32] = '\0';
	US_DEBUGP("String returned from FC init is: %s\n", buffer);

	/* Special thanks to the people at Freecom for providing me with
	* this "magic sequence", which they use in their Windows and MacOS
	* drivers to make sure that all the attached perhiperals are
	* properly reset.
	*/

	/* send reset */
	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
	0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
	US_DEBUGP("result from activate reset is %d\n", result);

	/* wait 250ms */
	mdelay(250);

	/* clear reset */
	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
	0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
	US_DEBUGP("result from clear reset is %d\n", result);

	/* wait 3 seconds */
	mdelay(3 * 1000);

	return USB_STOR_TRANSPORT_GOOD;
	}

	int usb_stor_freecom_reset(struct us_data *us)
	{
	printk (KERN_CRIT "freecom reset called\n");

	/* We don't really have this feature. */
	return FAILED;
	}

	#ifdef CONFIG_USB_STORAGE_DEBUG
	static void pdump (void *ibuffer, int length)
	{
	static char line[80];
	int offset = 0;
	unsigned char buffer = (unsigned char ) ibuffer;
	int i, j;
	int from, base;

	offset = 0;
	for (i = 0; i < length; i++) {
	if ((i & 15) == 0) {
	if (i > 0) {
	offset += sprintf (line+offset, " - ");
	for (j = i - 16; j < i; j++) {
	if (buffer[j] >= 32 && buffer[j] <= 126)
	line[offset++] = buffer[j];
	else
	line[offset++] = '.';
	}
	line[offset] = 0;
	US_DEBUGP("%s\n", line);
	offset = 0;
	}
	offset += sprintf (line+offset, "%08x:", i);
	}
	else if ((i & 7) == 0) {
	offset += sprintf (line+offset, " -");
	}
	offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
	}

	/* Add the last "chunk" of data. */
	from = (length - 1) % 16;
	base = ((length - 1) / 16) * 16;

	for (i = from + 1; i < 16; i++)
	offset += sprintf (line+offset, " ");
	if (from < 8)
	offset += sprintf (line+offset, " ");
	offset += sprintf (line+offset, " - ");

	for (i = 0; i <= from; i++) {
	if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
	line[offset++] = buffer[base+i];
	else
	line[offset++] = '.';
	}
	line[offset] = 0;
	US_DEBUGP("%s\n", line);
	offset = 0;
	}
	#endif