patch-2.4.8 linux/drivers/usb/storage/datafab.c

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diff -u --recursive --new-file v2.4.7/linux/drivers/usb/storage/datafab.c linux/drivers/usb/storage/datafab.c
@@ -0,0 +1,806 @@
+/* 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)
+ *
+ * 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().  Basically this means
+ * setting mode_param_header[3] = 0x80.
+ */
+
+#include "transport.h"
+#include "protocol.h"
+#include "usb.h"
+#include "debug.h"
+#include "datafab.h"
+
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/malloc.h>
+
+extern int usb_stor_bulk_msg(struct us_data *us, void *data, int pipe,
+			     unsigned int len, unsigned int *act_len);
+
+static int datafab_determine_lun(struct us_data *us, struct datafab_info *info);
+
+
+static void datafab_dump_data(unsigned char *data, int len)
+{
+	unsigned char buf[80];
+	int sofar = 0;
+
+	if (!data)
+		return;
+
+	memset(buf, 0, sizeof(buf));
+
+	for (sofar = 0; sofar < len; sofar++) {
+		sprintf(buf + strlen(buf), "%02x ",
+			((unsigned int) data[sofar]) & 0xFF);
+
+		if (sofar % 16 == 15) {
+			US_DEBUGP("datafab:  %s\n", buf);
+			memset(buf, 0, sizeof(buf));
+		}
+	}
+
+	if (strlen(buf) != 0)
+		US_DEBUGP("datafab:  %s\n", buf);
+}
+
+
+static int datafab_raw_bulk(int direction,
+			    struct us_data *us,
+			    unsigned char *data, 
+		            unsigned int len)
+{
+	int result;
+	int act_len;
+	int pipe;
+
+	if (direction == SCSI_DATA_READ)
+		pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
+	else
+		pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
+
+	result = usb_stor_bulk_msg(us, data, pipe, len, &act_len);
+
+	// if we stall, we need to clear it before we go on 
+	if (result == -EPIPE) {
+		US_DEBUGP("datafab_raw_bulk: EPIPE. clearing endpoint halt for"
+			  " pipe 0x%x, stalled at %d bytes\n", pipe, act_len);
+		usb_clear_halt(us->pusb_dev, pipe);
+	}
+
+	if (result) {
+		// NAK - that means we've retried a few times already 
+		if (result == -ETIMEDOUT) {
+			US_DEBUGP("datafab_raw_bulk:  device NAKed\n");
+			return US_BULK_TRANSFER_FAILED;
+		}
+
+		// -ENOENT -- we canceled this transfer
+		if (result == -ENOENT) {
+			US_DEBUGP("datafab_raw_bulk:  transfer aborted\n");
+			return US_BULK_TRANSFER_ABORTED;
+		}
+
+		if (result == -EPIPE) {
+			US_DEBUGP("datafab_raw_bulk:  output pipe stalled\n");
+			return USB_STOR_TRANSPORT_FAILED;
+		}
+
+		// the catch-all case
+		US_DEBUGP("datafab_raw_bulk:  unknown error\n");
+		return US_BULK_TRANSFER_FAILED;
+	}
+
+	if (act_len != len) {
+		US_DEBUGP("datafab_raw_bulk:  Warning. Transferred only %d bytes\n", act_len);
+		return US_BULK_TRANSFER_SHORT;
+	}
+
+	US_DEBUGP("datafab_raw_bulk:  Transfered %d of %d bytes\n", act_len, len);
+	return US_BULK_TRANSFER_GOOD;
+}
+
+static inline int datafab_bulk_read(struct us_data *us,
+			            unsigned char *data, 
+		                    unsigned int len)
+{
+	if (len == 0)
+		return USB_STOR_TRANSPORT_GOOD;
+
+	US_DEBUGP("datafab_bulk_read:  len = %d\n", len);
+	return datafab_raw_bulk(SCSI_DATA_READ, us, data, len);
+}
+
+
+static inline int datafab_bulk_write(struct us_data *us,
+			             unsigned char *data, 
+		                     unsigned int len)
+{
+	if (len == 0)
+		return USB_STOR_TRANSPORT_GOOD;
+
+	US_DEBUGP("datafab_bulk_write:  len = %d\n", len);
+	return datafab_raw_bulk(SCSI_DATA_WRITE, us, data, len);
+}
+
+
+static int datafab_read_data(struct us_data *us,
+		             struct datafab_info *info,
+		             u32 sector,
+		             u32 sectors, 
+		             unsigned char *dest, 
+		             int use_sg)
+{
+	unsigned char command[8] = { 0, 0, 0, 0, 0, 0xE0, 0x20, 0x01 };
+	unsigned char *buffer = NULL;
+	unsigned char *ptr;
+	unsigned char  thistime;
+	struct scatterlist *sg = NULL;
+	int totallen, len, result;
+	int sg_idx = 0, current_sg_offset = 0;
+	int transferred, rc;
+
+	// 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) {
+		rc = datafab_determine_lun(us, info);
+		if (rc != USB_STOR_TRANSPORT_GOOD)
+			return rc;
+	}
+
+	command[5] += (info->lun << 4);
+
+	// If we're using scatter-gather, we have to create a new
+	// buffer to read all of the data in first, since a
+	// scatter-gather buffer could in theory start in the middle
+	// of a page, which would be bad. A developer who wants a
+	// challenge might want to write a limited-buffer
+	// version of this code.
+
+	totallen = sectors * info->ssize;
+
+	do {
+		// loop, never allocate or transfer more than 64k at once (min(128k, 255*info->ssize) is the real limit)
+		len = min(totallen, 65536);
+
+		if (use_sg) {
+			sg = (struct scatterlist *) dest;
+			buffer = kmalloc(len, GFP_KERNEL);
+			if (buffer == NULL)
+				return USB_STOR_TRANSPORT_ERROR;
+			ptr = buffer;
+		} else {
+			ptr = dest;
+		}
+
+		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] |= (sector >> 24) & 0x0F;
+
+		// send the command
+		US_DEBUGP("datafab_read_data:  sending following command\n");
+		datafab_dump_data(command, sizeof(command));
+
+		result = datafab_bulk_write(us, command, sizeof(command));
+		if (result != USB_STOR_TRANSPORT_GOOD) {
+			if (use_sg)
+				kfree(buffer);
+			return result;
+		}
+
+		// read the result
+		result = datafab_bulk_read(us, ptr, len);
+		if (result != USB_STOR_TRANSPORT_GOOD) {
+			if (use_sg)
+				kfree(buffer);
+			return result;
+		}
+
+		US_DEBUGP("datafab_read_data results:  %d bytes\n", len);
+		// datafab_dump_data(ptr, len);
+
+		sectors -= thistime;
+		sector  += thistime;
+
+		if (use_sg) {
+			transferred = 0;
+			while (sg_idx < use_sg && transferred < len) {
+				if (len - transferred >= sg[sg_idx].length - current_sg_offset) {
+					US_DEBUGP("datafab_read_data:  adding %d bytes to %d byte sg buffer\n", sg[sg_idx].length - current_sg_offset, sg[sg_idx].length);
+					memcpy(sg[sg_idx].address + current_sg_offset,
+					       buffer + transferred,
+					       sg[sg_idx].length - current_sg_offset);
+					transferred += sg[sg_idx].length - current_sg_offset;
+					current_sg_offset = 0;
+					// on to the next sg buffer
+					++sg_idx;
+				} else {
+					US_DEBUGP("datafab_read_data:  adding %d bytes to %d byte sg buffer\n", len - transferred, sg[sg_idx].length);
+					memcpy(sg[sg_idx].address + current_sg_offset,
+					       buffer + transferred,
+					       len - transferred);
+					current_sg_offset += len - transferred;
+					// this sg buffer is only partially full and we're out of data to copy in
+					break;
+				}
+			}
+			kfree(buffer);
+		} else {
+			dest += len;
+		}
+
+		totallen -= len;
+	} while (totallen > 0);
+
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+
+static int datafab_write_data(struct us_data *us,
+		              struct datafab_info *info,
+		              u32 sector,
+		              u32 sectors, 
+		              unsigned char *src, 
+		              int use_sg)
+{
+	unsigned char command[8] = { 0, 0, 0, 0, 0, 0xE0, 0x30, 0x02 };
+	unsigned char reply[2] = { 0, 0 };
+	unsigned char *buffer = NULL;
+	unsigned char *ptr;
+	unsigned char thistime;
+	struct scatterlist *sg = NULL;
+	int totallen, len, result;
+	int sg_idx = 0, current_sg_offset = 0;
+	int transferred, rc;
+
+	// 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) {
+		rc = datafab_determine_lun(us, info);
+		if (rc != USB_STOR_TRANSPORT_GOOD)
+			return rc;
+	}
+
+	command[5] += (info->lun << 4);
+
+	// If we're using scatter-gather, we have to create a new
+	// buffer to read all of the data in first, since a
+	// scatter-gather buffer could in theory start in the middle
+	// of a page, which would be bad. A developer who wants a
+	// challenge might want to write a limited-buffer
+	// version of this code.
+
+	totallen = sectors * info->ssize;
+
+	do {
+		// loop, never allocate or transfer more than 64k at once (min(128k, 255*info->ssize) is the real limit)
+		len = min(totallen, 65536);
+
+		if (use_sg) {
+			sg = (struct scatterlist *) src;
+			buffer = kmalloc(len, GFP_KERNEL);
+			if (buffer == NULL)
+				return USB_STOR_TRANSPORT_ERROR;
+			ptr = buffer;
+
+			memset(buffer, 0, len);
+
+			// copy the data from the sg bufs into the big contiguous buf
+			//
+			transferred = 0;
+			while (transferred < len) {
+				if (len - transferred >= sg[sg_idx].length - current_sg_offset) {
+					US_DEBUGP("datafab_write_data:  getting %d bytes from %d byte sg buffer\n", sg[sg_idx].length - current_sg_offset, sg[sg_idx].length);
+					memcpy(ptr + transferred,
+					       sg[sg_idx].address + current_sg_offset,
+					       sg[sg_idx].length - current_sg_offset);
+					transferred += sg[sg_idx].length - current_sg_offset;
+					current_sg_offset = 0;
+					// on to the next sg buffer
+					++sg_idx;
+				} else {
+					US_DEBUGP("datafab_write_data:  getting %d bytes from %d byte sg buffer\n", len - transferred, sg[sg_idx].length);
+					memcpy(ptr + transferred,
+					       sg[sg_idx].address + current_sg_offset,
+					       len - transferred);
+					current_sg_offset += len - transferred;
+					// we only copied part of this sg buffer
+					break;
+				}
+			}
+		} else {
+			ptr = src;
+		}
+
+		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] |= (sector >> 24) & 0x0F;
+
+		// send the command
+		US_DEBUGP("datafab_write_data:  sending following command\n");
+		datafab_dump_data(command, sizeof(command));
+
+		result = datafab_bulk_write(us, command, sizeof(command));
+		if (result != USB_STOR_TRANSPORT_GOOD) {
+			if (use_sg)
+				kfree(buffer);
+			return result;
+		}
+
+		// send the data
+		result = datafab_bulk_write(us, ptr, len);
+		if (result != USB_STOR_TRANSPORT_GOOD) {
+			if (use_sg)
+				kfree(buffer);
+			return result;
+		}
+
+		// read the result
+		result = datafab_bulk_read(us, reply, sizeof(reply));
+		if (result != USB_STOR_TRANSPORT_GOOD) {
+			if (use_sg)
+				kfree(buffer);
+			return result;
+		}
+
+		if (reply[0] != 0x50 && reply[1] != 0) {
+			US_DEBUGP("datafab_write_data:  Gah! write return code: %02x %02x\n", reply[0], reply[1]);
+			if (use_sg)
+				kfree(buffer);
+			return USB_STOR_TRANSPORT_ERROR;
+		}
+
+		sectors -= thistime;
+		sector  += thistime;
+
+		if (use_sg) {
+			kfree(buffer);
+		} else {
+			src += len;
+		}
+
+		totallen -= len;
+	} while (totallen > 0);
+
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+
+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?
+	//
+	unsigned char command[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 };
+	unsigned char buf[512];
+	int count = 0, rc;
+
+	if (!us || !info)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	US_DEBUGP("datafab_determine_lun:  locating...\n");
+
+	// we'll try 10 times before giving up...
+	//
+	while (count++ < 10) {
+		command[5] = 0xa0;
+
+		rc = datafab_bulk_write(us, command, 8);
+		if (rc != USB_STOR_TRANSPORT_GOOD) 
+			return rc;
+
+		rc = datafab_bulk_read(us, buf, sizeof(buf));
+		if (rc == USB_STOR_TRANSPORT_GOOD) {
+			info->lun = 0;
+			return USB_STOR_TRANSPORT_GOOD;
+		}
+
+		command[5] = 0xb0;
+
+		rc = datafab_bulk_write(us, command, 8);
+		if (rc != USB_STOR_TRANSPORT_GOOD) 
+			return rc;
+
+		rc = datafab_bulk_read(us, buf, sizeof(buf));
+		if (rc == USB_STOR_TRANSPORT_GOOD) {
+			info->lun = 1;
+			return USB_STOR_TRANSPORT_GOOD;
+		}
+
+                wait_ms(20);
+	}
+
+	return USB_STOR_TRANSPORT_FAILED;
+}
+
+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...
+	//
+	unsigned char command[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 };
+	unsigned char reply[512];
+	int rc;
+
+	if (!us || !info)
+		return USB_STOR_TRANSPORT_ERROR;
+
+	if (info->lun == -1) {
+		rc = datafab_determine_lun(us, info);
+		if (rc != USB_STOR_TRANSPORT_GOOD)
+			return rc;
+	}
+
+	command[5] += (info->lun << 4);
+
+	rc = datafab_bulk_write(us, command, 8);
+	if (rc != USB_STOR_TRANSPORT_GOOD) 
+		return rc;
+
+	// we'll go ahead and extract the media capacity while we're here...
+	//
+	rc = datafab_bulk_read(us, reply, sizeof(reply));
+	if (rc == USB_STOR_TRANSPORT_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])      );
+	}
+		
+	return rc;
+}
+
+
+static int datafab_handle_mode_sense(struct us_data *us,
+				     Scsi_Cmnd * srb, 
+		                     unsigned char *ptr,
+				     int sense_6)
+{
+	unsigned char mode_param_header[8] = {
+		0, 0, 0, 0, 0, 0, 0, 0
+	};
+	unsigned char rw_err_page[12] = {
+		0x1, 0xA, 0x21, 1, 0, 0, 0, 0, 1, 0, 0, 0
+	};
+	unsigned char cache_page[12] = {
+		0x8, 0xA, 0x1, 0, 0, 0, 0, 0, 0, 0, 0, 0
+	};
+	unsigned char rbac_page[12] = {
+		0x1B, 0xA, 0, 0x81, 0, 0, 0, 0, 0, 0, 0, 0
+	};
+	unsigned char timer_page[8] = {
+		0x1C, 0x6, 0, 0, 0, 0
+	};
+	unsigned char pc, page_code;
+	unsigned short total_len = 0;
+	unsigned short param_len, i = 0;
+
+	// 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...
+	//
+        
+	if (sense_6)
+		param_len = srb->cmnd[4];
+	else
+		param_len = ((u16) (srb->cmnd[7]) >> 8) | ((u16) (srb->cmnd[8]));
+
+	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;
+	}
+
+	mode_param_header[3] = 0x80;	// write enable
+
+	switch (page_code) {
+	   case 0x0:
+		// vendor-specific mode
+		return USB_STOR_TRANSPORT_ERROR;
+
+	   case 0x1:
+		total_len = sizeof(rw_err_page);
+		mode_param_header[0] = total_len >> 8;
+		mode_param_header[1] = total_len & 0xFF;
+		mode_param_header[3] = 0x00;	// WP enable: 0x80
+
+		memcpy(ptr, mode_param_header, sizeof(mode_param_header));
+		i += sizeof(mode_param_header);
+		memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
+		break;
+
+	   case 0x8:
+		total_len = sizeof(cache_page);
+		mode_param_header[0] = total_len >> 8;
+		mode_param_header[1] = total_len & 0xFF;
+		mode_param_header[3] = 0x00;	// WP enable: 0x80
+
+		memcpy(ptr, mode_param_header, sizeof(mode_param_header));
+		i += sizeof(mode_param_header);
+		memcpy(ptr + i, cache_page, sizeof(cache_page));
+		break;
+
+	   case 0x1B:
+		total_len = sizeof(rbac_page);
+		mode_param_header[0] = total_len >> 8;
+		mode_param_header[1] = total_len & 0xFF;
+		mode_param_header[3] = 0x00;	// WP enable: 0x80
+
+		memcpy(ptr, mode_param_header, sizeof(mode_param_header));
+		i += sizeof(mode_param_header);
+		memcpy(ptr + i, rbac_page, sizeof(rbac_page));
+		break;
+
+	   case 0x1C:
+		total_len = sizeof(timer_page);
+		mode_param_header[0] = total_len >> 8;
+		mode_param_header[1] = total_len & 0xFF;
+		mode_param_header[3] = 0x00;	// WP enable: 0x80
+
+		memcpy(ptr, mode_param_header, sizeof(mode_param_header));
+		i += sizeof(mode_param_header);
+		memcpy(ptr + i, timer_page, sizeof(timer_page));
+		break;
+
+	   case 0x3F:		// retrieve all pages
+		total_len = sizeof(timer_page) + sizeof(rbac_page) +
+		    sizeof(cache_page) + sizeof(rw_err_page);
+		mode_param_header[0] = total_len >> 8;
+		mode_param_header[1] = total_len & 0xFF;
+		mode_param_header[3] = 0x00;	// WP enable
+
+		memcpy(ptr, mode_param_header, sizeof(mode_param_header));
+		i += sizeof(mode_param_header);
+		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));
+		break;
+	}
+
+	return USB_STOR_TRANSPORT_GOOD;
+}
+
+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
+//
+int datafab_transport(Scsi_Cmnd * srb, struct us_data *us)
+{
+	struct datafab_info *info;
+	int rc;
+	unsigned long block, blocks;
+	unsigned char *ptr = NULL;
+	unsigned char inquiry_reply[36] = {
+		0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
+	};
+
+	if (!us->extra) {
+		us->extra = kmalloc(sizeof(struct datafab_info), GFP_KERNEL);
+		if (!us->extra) {
+			US_DEBUGP("datafab_transport:  Gah! Can't allocate storage for Datafab info struct!\n");
+			return USB_STOR_TRANSPORT_ERROR;
+		}
+		memset(us->extra, 0, sizeof(struct datafab_info));
+		us->extra_destructor = datafab_info_destructor;
+  		((struct datafab_info *)us->extra)->lun = -1;
+	}
+
+	info = (struct datafab_info *) (us->extra);
+	ptr = (unsigned char *) srb->request_buffer;
+
+	if (srb->cmnd[0] == INQUIRY) {
+		US_DEBUGP("datafab_transport:  INQUIRY.  Returning bogus response");
+		memset( inquiry_reply + 8, 0, 28 );
+		fill_inquiry_response(us, inquiry_reply, 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
+		//
+		ptr[0] = (info->sectors >> 24) & 0xFF;
+		ptr[1] = (info->sectors >> 16) & 0xFF;
+		ptr[2] = (info->sectors >> 8) & 0xFF;
+		ptr[3] = (info->sectors) & 0xFF;
+
+		ptr[4] = (info->ssize >> 24) & 0xFF;
+		ptr[5] = (info->ssize >> 16) & 0xFF;
+		ptr[6] = (info->ssize >> 8) & 0xFF;
+		ptr[7] = (info->ssize) & 0xFF;
+
+		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.  Just set MODE_XLATE and
+	// let the usb storage code convert to READ_10/WRITE_10
+	//
+	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, ptr, srb->use_sg);
+	}
+
+	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, ptr, srb->use_sg);
+	}
+
+	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, ptr, srb->use_sg);
+	}
+
+	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, ptr, srb->use_sg);
+	}
+
+	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
+		//
+		ptr[0] = 0xF0;
+		ptr[2] = info->sense_key;
+		ptr[7] = 11;
+		ptr[12] = info->sense_asc;
+		ptr[13] = info->sense_ascq;
+
+		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, ptr, TRUE);
+	}
+
+	if (srb->cmnd[0] == MODE_SENSE_10) {
+		US_DEBUGP("datafab_transport:  MODE_SENSE_10 detected\n");
+		return datafab_handle_mode_sense(us, srb, ptr, FALSE);
+	}
+
+	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;
+	}
+
+	US_DEBUGP("datafab_transport:  Gah! Unknown command: %d (0x%x)\n", srb->cmnd[0], srb->cmnd[0]);
+	return USB_STOR_TRANSPORT_ERROR;
+}

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)