Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 938 insertions, 0 deletions

diff --git a/drivers/usb/storage/sddr55.c b/drivers/usb/storage/sddr55.c
new file mode 100644
index 0000000..229ca18
--- /dev/null
+++ b/drivers/usb/storage/sddr55.c
@@ -0,0 +1,938 @@
+/* Driver for SanDisk SDDR-55 SmartMedia reader
+ *
+ * $Id:$
+ *
+ * SDDR55 driver v0.1:
+ *
+ * First release
+ *
+ * Current development and maintenance by:
+ *   (c) 2002 Simon Munton
+ *
+ * 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.
+ */
+
+#include <linux/jiffies.h>
+#include <linux/errno.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"
+#include "sddr55.h"
+
+
+#define short_pack(lsb,msb) ( ((u16)(lsb)) | ( ((u16)(msb))<<8 ) )
+#define LSB_of(s) ((s)&0xFF)
+#define MSB_of(s) ((s)>>8)
+#define PAGESIZE  512
+
+#define set_sense_info(sk, asc, ascq)	\
+    do {				\
+	info->sense_data[2] = sk;	\
+	info->sense_data[12] = asc;	\
+	info->sense_data[13] = ascq;	\
+	} while (0)
+
+
+struct sddr55_card_info {
+	unsigned long	capacity;	/* Size of card in bytes */
+	int		max_log_blks;	/* maximum number of logical blocks */
+	int		pageshift;	/* log2 of pagesize */
+	int		smallpageshift;	/* 1 if pagesize == 256 */
+	int		blocksize;	/* Size of block in pages */
+	int		blockshift;	/* log2 of blocksize */
+	int		blockmask;	/* 2^blockshift - 1 */
+	int		read_only;	/* non zero if card is write protected */
+	int		force_read_only;	/* non zero if we find a map error*/
+	int		*lba_to_pba;	/* logical to physical map */
+	int		*pba_to_lba;	/* physical to logical map */
+	int		fatal_error;	/* set if we detect something nasty */
+	unsigned long 	last_access;	/* number of jiffies since we last talked to device */
+	unsigned char   sense_data[18];
+};
+
+
+#define NOT_ALLOCATED		0xffffffff
+#define BAD_BLOCK		0xffff
+#define CIS_BLOCK		0x400
+#define UNUSED_BLOCK		0x3ff
+
+static int
+sddr55_bulk_transport(struct us_data *us, int direction,
+		      unsigned char *data, unsigned int len) {
+	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
+	unsigned int pipe = (direction == DMA_FROM_DEVICE) ?
+			us->recv_bulk_pipe : us->send_bulk_pipe;
+
+	if (!len)
+		return USB_STOR_XFER_GOOD;
+	info->last_access = jiffies;
+	return usb_stor_bulk_transfer_buf(us, pipe, data, len, NULL);
+}
+
+/* check if card inserted, if there is, update read_only status
+ * return non zero if no card
+ */
+
+static int sddr55_status(struct us_data *us)
+{
+	int result;
+	unsigned char *command = us->iobuf;
+	unsigned char *status = us->iobuf;
+	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
+
+	/* send command */
+	memset(command, 0, 8);
+	command[5] = 0xB0;
+	command[7] = 0x80;
+	result = sddr55_bulk_transport(us,
+		DMA_TO_DEVICE, command, 8);
+
+	US_DEBUGP("Result for send_command in status %d\n",
+		result);
+
+	if (result != USB_STOR_XFER_GOOD) {
+		set_sense_info (4, 0, 0);	/* hardware error */
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+
+	result = sddr55_bulk_transport(us,
+		DMA_FROM_DEVICE, status,	4);
+
+	/* expect to get short transfer if no card fitted */
+	if (result == USB_STOR_XFER_SHORT || result == USB_STOR_XFER_STALLED) {
+		/* had a short transfer, no card inserted, free map memory */
+		if (info->lba_to_pba)
+			kfree(info->lba_to_pba);
+		if (info->pba_to_lba)
+			kfree(info->pba_to_lba);
+		info->lba_to_pba = NULL;
+		info->pba_to_lba = NULL;
+
+		info->fatal_error = 0;
+		info->force_read_only = 0;
+
+		set_sense_info (2, 0x3a, 0);	/* not ready, medium not present */
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	if (result != USB_STOR_XFER_GOOD) {
+		set_sense_info (4, 0, 0);	/* hardware error */
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+	
+	/* check write protect status */
+	info->read_only = (status[0] & 0x20);
+
+	/* now read status */
+	result = sddr55_bulk_transport(us,
+		DMA_FROM_DEVICE, status,	2);
+
+	if (result != USB_STOR_XFER_GOOD) {
+		set_sense_info (4, 0, 0);	/* hardware error */
+	}
+
+	return (result == USB_STOR_XFER_GOOD ?
+			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_FAILED);
+}
+
+
+static int sddr55_read_data(struct us_data *us,
+		unsigned int lba,
+		unsigned int page,
+		unsigned short sectors) {
+
+	int result = USB_STOR_TRANSPORT_GOOD;
+	unsigned char *command = us->iobuf;
+	unsigned char *status = us->iobuf;
+	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
+	unsigned char *buffer;
+
+	unsigned int pba;
+	unsigned long address;
+
+	unsigned short pages;
+	unsigned int len, index, offset;
+
+	// Since we only read in one block 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.
+
+	len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
+			info->smallpageshift) * PAGESIZE;
+	buffer = kmalloc(len, GFP_NOIO);
+	if (buffer == NULL)
+		return USB_STOR_TRANSPORT_ERROR; /* out of memory */
+	index = offset = 0;
+
+	while (sectors>0) {
+
+		/* have we got to end? */
+		if (lba >= info->max_log_blks)
+			break;
+
+		pba = info->lba_to_pba[lba];
+
+		// Read as many sectors as possible in this block
+
+		pages = min((unsigned int) sectors << info->smallpageshift,
+				info->blocksize - page);
+		len = pages << info->pageshift;
+
+		US_DEBUGP("Read %02X pages, from PBA %04X"
+			" (LBA %04X) page %02X\n",
+			pages, pba, lba, page);
+
+		if (pba == NOT_ALLOCATED) {
+			/* no pba for this lba, fill with zeroes */
+			memset (buffer, 0, len);
+		} else {
+
+			address = (pba << info->blockshift) + page;
+
+			command[0] = 0;
+			command[1] = LSB_of(address>>16);
+			command[2] = LSB_of(address>>8);
+			command[3] = LSB_of(address);
+
+			command[4] = 0;
+			command[5] = 0xB0;
+			command[6] = LSB_of(pages << (1 - info->smallpageshift));
+			command[7] = 0x85;
+
+			/* send command */
+			result = sddr55_bulk_transport(us,
+				DMA_TO_DEVICE, command, 8);
+
+			US_DEBUGP("Result for send_command in read_data %d\n",
+				result);
+
+			if (result != USB_STOR_XFER_GOOD) {
+				result = USB_STOR_TRANSPORT_ERROR;
+				goto leave;
+			}
+
+			/* read data */
+			result = sddr55_bulk_transport(us,
+				DMA_FROM_DEVICE, buffer, len);
+
+			if (result != USB_STOR_XFER_GOOD) {
+				result = USB_STOR_TRANSPORT_ERROR;
+				goto leave;
+			}
+
+			/* now read status */
+			result = sddr55_bulk_transport(us,
+				DMA_FROM_DEVICE, status, 2);
+
+			if (result != USB_STOR_XFER_GOOD) {
+				result = USB_STOR_TRANSPORT_ERROR;
+				goto leave;
+			}
+
+			/* check status for error */
+			if (status[0] == 0xff && status[1] == 0x4) {
+				set_sense_info (3, 0x11, 0);
+				result = USB_STOR_TRANSPORT_FAILED;
+				goto leave;
+			}
+		}
+
+		// Store the data in the transfer buffer
+		usb_stor_access_xfer_buf(buffer, len, us->srb,
+				&index, &offset, TO_XFER_BUF);
+
+		page = 0;
+		lba++;
+		sectors -= pages >> info->smallpageshift;
+	}
+
+	result = USB_STOR_TRANSPORT_GOOD;
+
+leave:
+	kfree(buffer);
+
+	return result;
+}
+
+static int sddr55_write_data(struct us_data *us,
+		unsigned int lba,
+		unsigned int page,
+		unsigned short sectors) {
+
+	int result = USB_STOR_TRANSPORT_GOOD;
+	unsigned char *command = us->iobuf;
+	unsigned char *status = us->iobuf;
+	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
+	unsigned char *buffer;
+
+	unsigned int pba;
+	unsigned int new_pba;
+	unsigned long address;
+
+	unsigned short pages;
+	int i;
+	unsigned int len, index, offset;
+
+	/* check if we are allowed to write */
+	if (info->read_only || info->force_read_only) {
+		set_sense_info (7, 0x27, 0);	/* read only */
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	// Since we only write one block 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.
+
+	len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
+			info->smallpageshift) * PAGESIZE;
+	buffer = kmalloc(len, GFP_NOIO);
+	if (buffer == NULL)
+		return USB_STOR_TRANSPORT_ERROR;
+	index = offset = 0;
+
+	while (sectors > 0) {
+
+		/* have we got to end? */
+		if (lba >= info->max_log_blks)
+			break;
+
+		pba = info->lba_to_pba[lba];
+
+		// Write as many sectors as possible in this block
+
+		pages = min((unsigned int) sectors << info->smallpageshift,
+				info->blocksize - page);
+		len = pages << info->pageshift;
+
+		// Get the data from the transfer buffer
+		usb_stor_access_xfer_buf(buffer, len, us->srb,
+				&index, &offset, FROM_XFER_BUF);
+
+		US_DEBUGP("Write %02X pages, to PBA %04X"
+			" (LBA %04X) page %02X\n",
+			pages, pba, lba, page);
+			
+		command[4] = 0;
+
+		if (pba == NOT_ALLOCATED) {
+			/* no pba allocated for this lba, find a free pba to use */
+
+			int max_pba = (info->max_log_blks / 250 ) * 256;
+			int found_count = 0;
+			int found_pba = -1;
+
+			/* set pba to first block in zone lba is in */
+			pba = (lba / 1000) * 1024;
+
+			US_DEBUGP("No PBA for LBA %04X\n",lba);
+
+			if (max_pba > 1024)
+				max_pba = 1024;
+
+			/*
+			 * Scan through the map looking for an unused block
+			 * leave 16 unused blocks at start (or as many as
+			 * possible) since the sddr55 seems to reuse a used
+			 * block when it shouldn't if we don't leave space.
+			 */
+			for (i = 0; i < max_pba; i++, pba++) {
+				if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
+					found_pba = pba;
+					if (found_count++ > 16)
+						break;
+				}
+			}
+
+			pba = found_pba;
+
+			if (pba == -1) {
+				/* oh dear */
+				US_DEBUGP("Couldn't find unallocated block\n");
+
+				set_sense_info (3, 0x31, 0);	/* medium error */
+				result = USB_STOR_TRANSPORT_FAILED;
+				goto leave;
+			}
+
+			US_DEBUGP("Allocating PBA %04X for LBA %04X\n", pba, lba);
+
+			/* set writing to unallocated block flag */
+			command[4] = 0x40;
+		}
+
+		address = (pba << info->blockshift) + page;
+
+		command[1] = LSB_of(address>>16);
+		command[2] = LSB_of(address>>8); 
+		command[3] = LSB_of(address);
+
+		/* set the lba into the command, modulo 1000 */
+		command[0] = LSB_of(lba % 1000);
+		command[6] = MSB_of(lba % 1000);
+
+		command[4] |= LSB_of(pages >> info->smallpageshift);
+		command[5] = 0xB0;
+		command[7] = 0x86;
+
+		/* send command */
+		result = sddr55_bulk_transport(us,
+			DMA_TO_DEVICE, command, 8);
+
+		if (result != USB_STOR_XFER_GOOD) {
+			US_DEBUGP("Result for send_command in write_data %d\n",
+			result);
+
+			/* set_sense_info is superfluous here? */
+			set_sense_info (3, 0x3, 0);/* peripheral write error */
+			result = USB_STOR_TRANSPORT_FAILED;
+			goto leave;
+		}
+
+		/* send the data */
+		result = sddr55_bulk_transport(us,
+			DMA_TO_DEVICE, buffer, len);
+
+		if (result != USB_STOR_XFER_GOOD) {
+			US_DEBUGP("Result for send_data in write_data %d\n",
+				  result);
+
+			/* set_sense_info is superfluous here? */
+			set_sense_info (3, 0x3, 0);/* peripheral write error */
+			result = USB_STOR_TRANSPORT_FAILED;
+			goto leave;
+		}
+
+		/* now read status */
+		result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, status, 6);
+
+		if (result != USB_STOR_XFER_GOOD) {
+			US_DEBUGP("Result for get_status in write_data %d\n",
+				  result);
+
+			/* set_sense_info is superfluous here? */
+			set_sense_info (3, 0x3, 0);/* peripheral write error */
+			result = USB_STOR_TRANSPORT_FAILED;
+			goto leave;
+		}
+
+		new_pba = (status[3] + (status[4] << 8) + (status[5] << 16))
+						  >> info->blockshift;
+
+		/* check status for error */
+		if (status[0] == 0xff && status[1] == 0x4) {
+			info->pba_to_lba[new_pba] = BAD_BLOCK;
+
+			set_sense_info (3, 0x0c, 0);
+			result = USB_STOR_TRANSPORT_FAILED;
+			goto leave;
+		}
+
+		US_DEBUGP("Updating maps for LBA %04X: old PBA %04X, new PBA %04X\n",
+			lba, pba, new_pba);
+
+		/* update the lba<->pba maps, note new_pba might be the same as pba */
+		info->lba_to_pba[lba] = new_pba;
+		info->pba_to_lba[pba] = UNUSED_BLOCK;
+
+		/* check that new_pba wasn't already being used */
+		if (info->pba_to_lba[new_pba] != UNUSED_BLOCK) {
+			printk(KERN_ERR "sddr55 error: new PBA %04X already in use for LBA %04X\n",
+				new_pba, info->pba_to_lba[new_pba]);
+			info->fatal_error = 1;
+			set_sense_info (3, 0x31, 0);
+			result = USB_STOR_TRANSPORT_FAILED;
+			goto leave;
+		}
+
+		/* update the pba<->lba maps for new_pba */
+		info->pba_to_lba[new_pba] = lba % 1000;
+
+		page = 0;
+		lba++;
+		sectors -= pages >> info->smallpageshift;
+	}
+	result = USB_STOR_TRANSPORT_GOOD;
+
+ leave:
+	kfree(buffer);
+	return result;
+}
+
+static int sddr55_read_deviceID(struct us_data *us,
+		unsigned char *manufacturerID,
+		unsigned char *deviceID) {
+
+	int result;
+	unsigned char *command = us->iobuf;
+	unsigned char *content = us->iobuf;
+
+	memset(command, 0, 8);
+	command[5] = 0xB0;
+	command[7] = 0x84;
+	result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);
+
+	US_DEBUGP("Result of send_control for device ID is %d\n",
+		result);
+
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	result = sddr55_bulk_transport(us,
+		DMA_FROM_DEVICE, content, 4);
+
+	if (result != USB_STOR_XFER_GOOD)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	*manufacturerID = content[0];
+	*deviceID = content[1];
+
+	if (content[0] != 0xff)	{
+    		result = sddr55_bulk_transport(us,
+			DMA_FROM_DEVICE, content, 2);
+	}
+
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+
+int sddr55_reset(struct us_data *us) {
+	return 0;
+}
+
+
+static unsigned long sddr55_get_capacity(struct us_data *us) {
+
+	unsigned char manufacturerID;
+	unsigned char deviceID;
+	int result;
+	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
+
+	US_DEBUGP("Reading capacity...\n");
+
+	result = sddr55_read_deviceID(us,
+		&manufacturerID,
+		&deviceID);
+
+	US_DEBUGP("Result of read_deviceID is %d\n",
+		result);
+
+	if (result != USB_STOR_XFER_GOOD)
+		return 0;
+
+	US_DEBUGP("Device ID = %02X\n", deviceID);
+	US_DEBUGP("Manuf  ID = %02X\n", manufacturerID);
+
+	info->pageshift = 9;
+	info->smallpageshift = 0;
+	info->blocksize = 16;
+	info->blockshift = 4;
+	info->blockmask = 15;
+
+	switch (deviceID) {
+
+	case 0x6e: // 1MB
+	case 0xe8:
+	case 0xec:
+		info->pageshift = 8;
+		info->smallpageshift = 1;
+		return 0x00100000;
+
+	case 0xea: // 2MB
+	case 0x64:
+		info->pageshift = 8;
+		info->smallpageshift = 1;
+	case 0x5d: // 5d is a ROM card with pagesize 512.
+		return 0x00200000;
+
+	case 0xe3: // 4MB
+	case 0xe5:
+	case 0x6b:
+	case 0xd5:
+		return 0x00400000;
+
+	case 0xe6: // 8MB
+	case 0xd6:
+		return 0x00800000;
+
+	case 0x73: // 16MB
+		info->blocksize = 32;
+		info->blockshift = 5;
+		info->blockmask = 31;
+		return 0x01000000;
+
+	case 0x75: // 32MB
+		info->blocksize = 32;
+		info->blockshift = 5;
+		info->blockmask = 31;
+		return 0x02000000;
+
+	case 0x76: // 64MB
+		info->blocksize = 32;
+		info->blockshift = 5;
+		info->blockmask = 31;
+		return 0x04000000;
+
+	case 0x79: // 128MB
+		info->blocksize = 32;
+		info->blockshift = 5;
+		info->blockmask = 31;
+		return 0x08000000;
+
+	default: // unknown
+		return 0;
+
+	}
+}
+
+static int sddr55_read_map(struct us_data *us) {
+
+	struct sddr55_card_info *info = (struct sddr55_card_info *)(us->extra);
+	int numblocks;
+	unsigned char *buffer;
+	unsigned char *command = us->iobuf;
+	int i;
+	unsigned short lba;
+	unsigned short max_lba;
+	int result;
+
+	if (!info->capacity)
+		return -1;
+
+	numblocks = info->capacity >> (info->blockshift + info->pageshift);
+	
+	buffer = kmalloc( numblocks * 2, GFP_NOIO );
+	
+	if (!buffer)
+		return -1;
+
+	memset(command, 0, 8);
+	command[5] = 0xB0;
+	command[6] = numblocks * 2 / 256;
+	command[7] = 0x8A;
+
+	result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);
+
+	if ( result != USB_STOR_XFER_GOOD) {
+		kfree (buffer);
+		return -1;
+	}
+
+	result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, buffer, numblocks * 2);
+
+	if ( result != USB_STOR_XFER_GOOD) {
+		kfree (buffer);
+		return -1;
+	}
+
+	result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, command, 2);
+
+	if ( result != USB_STOR_XFER_GOOD) {
+		kfree (buffer);
+		return -1;
+	}
+
+	if (info->lba_to_pba)
+		kfree(info->lba_to_pba);
+	if (info->pba_to_lba)
+		kfree(info->pba_to_lba);
+	info->lba_to_pba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
+	info->pba_to_lba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
+
+	if (info->lba_to_pba == NULL || info->pba_to_lba == NULL) {
+		if (info->lba_to_pba != NULL)
+			kfree(info->lba_to_pba);
+		if (info->pba_to_lba != NULL)
+			kfree(info->pba_to_lba);
+		info->lba_to_pba = NULL;
+		info->pba_to_lba = NULL;
+		kfree(buffer);
+		return -1;
+	}
+
+	memset(info->lba_to_pba, 0xff, numblocks*sizeof(int));
+	memset(info->pba_to_lba, 0xff, numblocks*sizeof(int));
+
+	/* set maximum lba */
+	max_lba = info->max_log_blks;
+	if (max_lba > 1000)
+		max_lba = 1000;
+
+	// Each block is 64 bytes of control data, so block i is located in
+	// scatterlist block i*64/128k = i*(2^6)*(2^-17) = i*(2^-11)
+
+	for (i=0; i<numblocks; i++) {
+		int zone = i / 1024;
+
+		lba = short_pack(buffer[i * 2], buffer[i * 2 + 1]);
+
+			/* Every 1024 physical blocks ("zone"), the LBA numbers
+			 * go back to zero, but are within a higher
+			 * block of LBA's. Also, there is a maximum of
+			 * 1000 LBA's per zone. In other words, in PBA
+			 * 1024-2047 you will find LBA 0-999 which are
+			 * really LBA 1000-1999. Yes, this wastes 24
+			 * physical blocks per zone. Go figure. 
+			 * These devices can have blocks go bad, so there
+			 * are 24 spare blocks to use when blocks do go bad.
+			 */
+
+			/* SDDR55 returns 0xffff for a bad block, and 0x400 for the 
+			 * CIS block. (Is this true for cards 8MB or less??)
+			 * Record these in the physical to logical map
+			 */ 
+
+		info->pba_to_lba[i] = lba;
+
+		if (lba >= max_lba) {
+			continue;
+		}
+		
+		if (info->lba_to_pba[lba + zone * 1000] != NOT_ALLOCATED &&
+		    !info->force_read_only) {
+			printk("sddr55: map inconsistency at LBA %04X\n", lba + zone * 1000);
+			info->force_read_only = 1;
+		}
+
+		if (lba<0x10 || (lba>=0x3E0 && lba<0x3EF))
+			US_DEBUGP("LBA %04X <-> PBA %04X\n", lba, i);
+
+		info->lba_to_pba[lba + zone * 1000] = i;
+	}
+
+	kfree(buffer);
+	return 0;
+}
+
+
+static void sddr55_card_info_destructor(void *extra) {
+	struct sddr55_card_info *info = (struct sddr55_card_info *)extra;
+
+	if (!extra)
+		return;
+
+	if (info->lba_to_pba)
+		kfree(info->lba_to_pba);
+	if (info->pba_to_lba)
+		kfree(info->pba_to_lba);
+}
+
+
+/*
+ * Transport for the Sandisk SDDR-55
+ */
+int sddr55_transport(struct scsi_cmnd *srb, struct us_data *us)
+{
+	int result;
+	static unsigned char inquiry_response[8] = {
+		0x00, 0x80, 0x00, 0x02, 0x1F, 0x00, 0x00, 0x00
+	};
+ 	// write-protected for now, no block descriptor support
+	static unsigned char mode_page_01[20] = {
+		0x0, 0x12, 0x00, 0x80, 0x0, 0x0, 0x0, 0x0,
+		0x01, 0x0A,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+	};
+	unsigned char *ptr = us->iobuf;
+	unsigned long capacity;
+	unsigned int lba;
+	unsigned int pba;
+	unsigned int page;
+	unsigned short pages;
+	struct sddr55_card_info *info;
+
+	if (!us->extra) {
+		us->extra = kmalloc(
+			sizeof(struct sddr55_card_info), GFP_NOIO);
+		if (!us->extra)
+			return USB_STOR_TRANSPORT_ERROR;
+		memset(us->extra, 0, sizeof(struct sddr55_card_info));
+		us->extra_destructor = sddr55_card_info_destructor;
+	}
+
+	info = (struct sddr55_card_info *)(us->extra);
+
+	if (srb->cmnd[0] == REQUEST_SENSE) {
+		US_DEBUGP("SDDR55: request sense %02x/%02x/%02x\n", info->sense_data[2], info->sense_data[12], info->sense_data[13]);
+
+		memcpy (ptr, info->sense_data, sizeof info->sense_data);
+		ptr[0] = 0x70;
+		ptr[7] = 11;
+		usb_stor_set_xfer_buf (ptr, sizeof info->sense_data, srb);
+		memset (info->sense_data, 0, sizeof info->sense_data);
+
+		return USB_STOR_TRANSPORT_GOOD;
+	}
+
+	memset (info->sense_data, 0, sizeof info->sense_data);
+
+	/* Dummy up a response for INQUIRY since SDDR55 doesn't
+	   respond to INQUIRY commands */
+
+	if (srb->cmnd[0] == INQUIRY) {
+		memcpy(ptr, inquiry_response, 8);
+		fill_inquiry_response(us, ptr, 36);
+		return USB_STOR_TRANSPORT_GOOD;
+	}
+
+	/* only check card status if the map isn't allocated, ie no card seen yet
+	 * or if it's been over half a second since we last accessed it
+	 */
+	if (info->lba_to_pba == NULL || time_after(jiffies, info->last_access + HZ/2)) {
+
+		/* check to see if a card is fitted */
+		result = sddr55_status (us);
+		if (result) {
+			result = sddr55_status (us);
+			if (!result) {
+			set_sense_info (6, 0x28, 0);	/* new media, set unit attention, not ready to ready */
+			}
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+	}
+
+	/* if we detected a problem with the map when writing,
+	   don't allow any more access */
+	if (info->fatal_error) {
+
+		set_sense_info (3, 0x31, 0);
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	if (srb->cmnd[0] == READ_CAPACITY) {
+
+		capacity = sddr55_get_capacity(us);
+
+		if (!capacity) {
+			set_sense_info (3, 0x30, 0); /* incompatible medium */
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+
+		info->capacity = capacity;
+
+		/* figure out the maximum logical block number, allowing for
+		 * the fact that only 250 out of every 256 are used */
+		info->max_log_blks = ((info->capacity >> (info->pageshift + info->blockshift)) / 256) * 250;
+
+		/* Last page in the card, adjust as we only use 250 out of
+		 * every 256 pages */
+		capacity = (capacity / 256) * 250;
+
+		capacity /= PAGESIZE;
+		capacity--;
+
+		((__be32 *) ptr)[0] = cpu_to_be32(capacity);
+		((__be32 *) ptr)[1] = cpu_to_be32(PAGESIZE);
+		usb_stor_set_xfer_buf(ptr, 8, srb);
+
+		sddr55_read_map(us);
+
+		return USB_STOR_TRANSPORT_GOOD;
+	}
+
+	if (srb->cmnd[0] == MODE_SENSE_10) {
+
+		memcpy(ptr, mode_page_01, sizeof mode_page_01);
+		ptr[3] = (info->read_only || info->force_read_only) ? 0x80 : 0;
+		usb_stor_set_xfer_buf(ptr, sizeof(mode_page_01), srb);
+
+		if ( (srb->cmnd[2] & 0x3F) == 0x01 ) {
+			US_DEBUGP(
+			  "SDDR55: Dummy up request for mode page 1\n");
+			return USB_STOR_TRANSPORT_GOOD;
+
+		} else if ( (srb->cmnd[2] & 0x3F) == 0x3F ) {
+			US_DEBUGP(
+			  "SDDR55: Dummy up request for all mode pages\n");
+			return USB_STOR_TRANSPORT_GOOD;
+		}
+
+		set_sense_info (5, 0x24, 0);	/* invalid field in command */
+		return USB_STOR_TRANSPORT_FAILED;
+	}
+
+	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {
+
+		US_DEBUGP(
+		  "SDDR55: %s medium removal. Not that I can do"
+		  " anything about it...\n",
+		  (srb->cmnd[4]&0x03) ? "Prevent" : "Allow");
+
+		return USB_STOR_TRANSPORT_GOOD;
+
+	}
+
+	if (srb->cmnd[0] == READ_10 || srb->cmnd[0] == WRITE_10) {
+
+		page = short_pack(srb->cmnd[3], srb->cmnd[2]);
+		page <<= 16;
+		page |= short_pack(srb->cmnd[5], srb->cmnd[4]);
+		pages = short_pack(srb->cmnd[8], srb->cmnd[7]);
+
+		page <<= info->smallpageshift;
+
+		// convert page to block and page-within-block
+
+		lba = page >> info->blockshift;
+		page = page & info->blockmask;
+
+		// locate physical block corresponding to logical block
+
+		if (lba >= info->max_log_blks) {
+
+			US_DEBUGP("Error: Requested LBA %04X exceeds maximum "
+			  "block %04X\n", lba, info->max_log_blks-1);
+
+			set_sense_info (5, 0x24, 0);	/* invalid field in command */
+
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+
+		pba = info->lba_to_pba[lba];
+
+		if (srb->cmnd[0] == WRITE_10) {
+			US_DEBUGP("WRITE_10: write block %04X (LBA %04X) page %01X"
+				" pages %d\n",
+				pba, lba, page, pages);
+
+			return sddr55_write_data(us, lba, page, pages);
+		} else {
+			US_DEBUGP("READ_10: read block %04X (LBA %04X) page %01X"
+				" pages %d\n",
+				pba, lba, page, pages);
+
+			return sddr55_read_data(us, lba, page, pages);
+		}
+	}
+
+
+	if (srb->cmnd[0] == TEST_UNIT_READY) {
+		return USB_STOR_TRANSPORT_GOOD;
+	}
+
+	if (srb->cmnd[0] == START_STOP) {
+		return USB_STOR_TRANSPORT_GOOD;
+	}
+
+	set_sense_info (5, 0x20, 0);	/* illegal command */
+
+	return USB_STOR_TRANSPORT_FAILED; // FIXME: sense buffer?
+}
+