forked from Minki/linux
1da177e4c3
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!
670 lines
18 KiB
C
670 lines
18 KiB
C
/* Driver for Datafab USB Compact Flash reader
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*
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* $Id: datafab.c,v 1.7 2002/02/25 00:40:13 mdharm Exp $
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*
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* datafab driver v0.1:
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*
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* First release
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*
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* Current development and maintenance by:
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* (c) 2000 Jimmie Mayfield (mayfield+datafab@sackheads.org)
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*
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* Many thanks to Robert Baruch for the SanDisk SmartMedia reader driver
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* which I used as a template for this driver.
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*
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* Some bugfixes and scatter-gather code by Gregory P. Smith
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* (greg-usb@electricrain.com)
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*
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* Fix for media change by Joerg Schneider (js@joergschneider.com)
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*
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* Other contributors:
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* (c) 2002 Alan Stern <stern@rowland.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* This driver attempts to support USB CompactFlash reader/writer devices
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* based on Datafab USB-to-ATA chips. It was specifically developed for the
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* Datafab MDCFE-B USB CompactFlash reader but has since been found to work
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* with a variety of Datafab-based devices from a number of manufacturers.
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* I've received a report of this driver working with a Datafab-based
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* SmartMedia device though please be aware that I'm personally unable to
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* test SmartMedia support.
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*
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* This driver supports reading and writing. If you're truly paranoid,
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* however, you can force the driver into a write-protected state by setting
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* the WP enable bits in datafab_handle_mode_sense(). See the comments
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* in that routine.
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*/
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include "usb.h"
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#include "transport.h"
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#include "protocol.h"
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#include "debug.h"
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#include "datafab.h"
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static int datafab_determine_lun(struct us_data *us,
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struct datafab_info *info);
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static inline int
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datafab_bulk_read(struct us_data *us, unsigned char *data, unsigned int len) {
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if (len == 0)
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return USB_STOR_XFER_GOOD;
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US_DEBUGP("datafab_bulk_read: len = %d\n", len);
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return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
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data, len, NULL);
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}
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static inline int
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datafab_bulk_write(struct us_data *us, unsigned char *data, unsigned int len) {
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if (len == 0)
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return USB_STOR_XFER_GOOD;
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US_DEBUGP("datafab_bulk_write: len = %d\n", len);
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return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
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data, len, NULL);
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}
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static int datafab_read_data(struct us_data *us,
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struct datafab_info *info,
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u32 sector,
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u32 sectors)
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{
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unsigned char *command = us->iobuf;
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unsigned char *buffer;
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unsigned char thistime;
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unsigned int totallen, alloclen;
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int len, result;
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unsigned int sg_idx = 0, sg_offset = 0;
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// we're working in LBA mode. according to the ATA spec,
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// we can support up to 28-bit addressing. I don't know if Datafab
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// supports beyond 24-bit addressing. It's kind of hard to test
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// since it requires > 8GB CF card.
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//
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if (sectors > 0x0FFFFFFF)
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return USB_STOR_TRANSPORT_ERROR;
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if (info->lun == -1) {
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result = datafab_determine_lun(us, info);
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if (result != USB_STOR_TRANSPORT_GOOD)
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return result;
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}
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totallen = sectors * info->ssize;
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// Since we don't read more than 64 KB at a time, we have to create
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// a bounce buffer and move the data a piece at a time between the
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// bounce buffer and the actual transfer buffer.
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alloclen = min(totallen, 65536u);
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buffer = kmalloc(alloclen, GFP_NOIO);
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if (buffer == NULL)
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return USB_STOR_TRANSPORT_ERROR;
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do {
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// loop, never allocate or transfer more than 64k at once
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// (min(128k, 255*info->ssize) is the real limit)
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len = min(totallen, alloclen);
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thistime = (len / info->ssize) & 0xff;
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command[0] = 0;
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command[1] = thistime;
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command[2] = sector & 0xFF;
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command[3] = (sector >> 8) & 0xFF;
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command[4] = (sector >> 16) & 0xFF;
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command[5] = 0xE0 + (info->lun << 4);
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command[5] |= (sector >> 24) & 0x0F;
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command[6] = 0x20;
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command[7] = 0x01;
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// send the read command
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result = datafab_bulk_write(us, command, 8);
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if (result != USB_STOR_XFER_GOOD)
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goto leave;
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// read the result
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result = datafab_bulk_read(us, buffer, len);
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if (result != USB_STOR_XFER_GOOD)
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goto leave;
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// Store the data in the transfer buffer
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usb_stor_access_xfer_buf(buffer, len, us->srb,
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&sg_idx, &sg_offset, TO_XFER_BUF);
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sector += thistime;
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totallen -= len;
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} while (totallen > 0);
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kfree(buffer);
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return USB_STOR_TRANSPORT_GOOD;
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leave:
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kfree(buffer);
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return USB_STOR_TRANSPORT_ERROR;
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}
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static int datafab_write_data(struct us_data *us,
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struct datafab_info *info,
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u32 sector,
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u32 sectors)
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{
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unsigned char *command = us->iobuf;
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unsigned char *reply = us->iobuf;
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unsigned char *buffer;
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unsigned char thistime;
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unsigned int totallen, alloclen;
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int len, result;
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unsigned int sg_idx = 0, sg_offset = 0;
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// we're working in LBA mode. according to the ATA spec,
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// we can support up to 28-bit addressing. I don't know if Datafab
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// supports beyond 24-bit addressing. It's kind of hard to test
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// since it requires > 8GB CF card.
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//
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if (sectors > 0x0FFFFFFF)
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return USB_STOR_TRANSPORT_ERROR;
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if (info->lun == -1) {
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result = datafab_determine_lun(us, info);
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if (result != USB_STOR_TRANSPORT_GOOD)
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return result;
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}
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totallen = sectors * info->ssize;
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// Since we don't write more than 64 KB at a time, we have to create
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// a bounce buffer and move the data a piece at a time between the
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// bounce buffer and the actual transfer buffer.
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alloclen = min(totallen, 65536u);
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buffer = kmalloc(alloclen, GFP_NOIO);
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if (buffer == NULL)
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return USB_STOR_TRANSPORT_ERROR;
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do {
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// loop, never allocate or transfer more than 64k at once
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// (min(128k, 255*info->ssize) is the real limit)
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len = min(totallen, alloclen);
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thistime = (len / info->ssize) & 0xff;
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// Get the data from the transfer buffer
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usb_stor_access_xfer_buf(buffer, len, us->srb,
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&sg_idx, &sg_offset, FROM_XFER_BUF);
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command[0] = 0;
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command[1] = thistime;
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command[2] = sector & 0xFF;
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command[3] = (sector >> 8) & 0xFF;
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command[4] = (sector >> 16) & 0xFF;
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command[5] = 0xE0 + (info->lun << 4);
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command[5] |= (sector >> 24) & 0x0F;
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command[6] = 0x30;
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command[7] = 0x02;
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// send the command
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result = datafab_bulk_write(us, command, 8);
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if (result != USB_STOR_XFER_GOOD)
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goto leave;
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// send the data
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result = datafab_bulk_write(us, buffer, len);
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if (result != USB_STOR_XFER_GOOD)
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goto leave;
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// read the result
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result = datafab_bulk_read(us, reply, 2);
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if (result != USB_STOR_XFER_GOOD)
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goto leave;
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if (reply[0] != 0x50 && reply[1] != 0) {
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US_DEBUGP("datafab_write_data: Gah! "
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"write return code: %02x %02x\n",
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reply[0], reply[1]);
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result = USB_STOR_TRANSPORT_ERROR;
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goto leave;
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}
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sector += thistime;
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totallen -= len;
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} while (totallen > 0);
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kfree(buffer);
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return USB_STOR_TRANSPORT_GOOD;
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leave:
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kfree(buffer);
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return USB_STOR_TRANSPORT_ERROR;
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}
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static int datafab_determine_lun(struct us_data *us,
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struct datafab_info *info)
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{
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// Dual-slot readers can be thought of as dual-LUN devices.
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// We need to determine which card slot is being used.
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// We'll send an IDENTIFY DEVICE command and see which LUN responds...
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//
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// There might be a better way of doing this?
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static unsigned char scommand[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 };
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unsigned char *command = us->iobuf;
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unsigned char *buf;
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int count = 0, rc;
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if (!us || !info)
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return USB_STOR_TRANSPORT_ERROR;
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memcpy(command, scommand, 8);
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buf = kmalloc(512, GFP_NOIO);
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if (!buf)
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return USB_STOR_TRANSPORT_ERROR;
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US_DEBUGP("datafab_determine_lun: locating...\n");
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// we'll try 3 times before giving up...
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//
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while (count++ < 3) {
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command[5] = 0xa0;
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rc = datafab_bulk_write(us, command, 8);
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if (rc != USB_STOR_XFER_GOOD) {
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rc = USB_STOR_TRANSPORT_ERROR;
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goto leave;
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}
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rc = datafab_bulk_read(us, buf, 512);
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if (rc == USB_STOR_XFER_GOOD) {
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info->lun = 0;
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rc = USB_STOR_TRANSPORT_GOOD;
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goto leave;
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}
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command[5] = 0xb0;
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rc = datafab_bulk_write(us, command, 8);
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if (rc != USB_STOR_XFER_GOOD) {
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rc = USB_STOR_TRANSPORT_ERROR;
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goto leave;
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}
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rc = datafab_bulk_read(us, buf, 512);
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if (rc == USB_STOR_XFER_GOOD) {
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info->lun = 1;
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rc = USB_STOR_TRANSPORT_GOOD;
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goto leave;
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}
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msleep(20);
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}
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rc = USB_STOR_TRANSPORT_ERROR;
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leave:
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kfree(buf);
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return rc;
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}
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static int datafab_id_device(struct us_data *us,
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struct datafab_info *info)
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{
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// this is a variation of the ATA "IDENTIFY DEVICE" command...according
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// to the ATA spec, 'Sector Count' isn't used but the Windows driver
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// sets this bit so we do too...
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//
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static unsigned char scommand[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 };
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unsigned char *command = us->iobuf;
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unsigned char *reply;
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int rc;
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if (!us || !info)
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return USB_STOR_TRANSPORT_ERROR;
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if (info->lun == -1) {
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rc = datafab_determine_lun(us, info);
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if (rc != USB_STOR_TRANSPORT_GOOD)
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return rc;
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}
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memcpy(command, scommand, 8);
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reply = kmalloc(512, GFP_NOIO);
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if (!reply)
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return USB_STOR_TRANSPORT_ERROR;
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command[5] += (info->lun << 4);
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rc = datafab_bulk_write(us, command, 8);
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if (rc != USB_STOR_XFER_GOOD) {
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rc = USB_STOR_TRANSPORT_ERROR;
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goto leave;
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}
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// we'll go ahead and extract the media capacity while we're here...
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//
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rc = datafab_bulk_read(us, reply, 512);
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if (rc == USB_STOR_XFER_GOOD) {
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// capacity is at word offset 57-58
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//
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info->sectors = ((u32)(reply[117]) << 24) |
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((u32)(reply[116]) << 16) |
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((u32)(reply[115]) << 8) |
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((u32)(reply[114]) );
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rc = USB_STOR_TRANSPORT_GOOD;
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goto leave;
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}
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rc = USB_STOR_TRANSPORT_ERROR;
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leave:
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kfree(reply);
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return rc;
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}
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static int datafab_handle_mode_sense(struct us_data *us,
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struct scsi_cmnd * srb,
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int sense_6)
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{
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static unsigned char rw_err_page[12] = {
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0x1, 0xA, 0x21, 1, 0, 0, 0, 0, 1, 0, 0, 0
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};
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static unsigned char cache_page[12] = {
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0x8, 0xA, 0x1, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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static unsigned char rbac_page[12] = {
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0x1B, 0xA, 0, 0x81, 0, 0, 0, 0, 0, 0, 0, 0
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};
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static unsigned char timer_page[8] = {
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0x1C, 0x6, 0, 0, 0, 0
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};
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unsigned char pc, page_code;
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unsigned int i = 0;
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struct datafab_info *info = (struct datafab_info *) (us->extra);
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unsigned char *ptr = us->iobuf;
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// most of this stuff is just a hack to get things working. the
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// datafab reader doesn't present a SCSI interface so we
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// fudge the SCSI commands...
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//
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pc = srb->cmnd[2] >> 6;
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page_code = srb->cmnd[2] & 0x3F;
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switch (pc) {
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case 0x0:
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US_DEBUGP("datafab_handle_mode_sense: Current values\n");
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break;
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case 0x1:
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US_DEBUGP("datafab_handle_mode_sense: Changeable values\n");
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break;
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case 0x2:
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US_DEBUGP("datafab_handle_mode_sense: Default values\n");
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break;
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case 0x3:
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US_DEBUGP("datafab_handle_mode_sense: Saves values\n");
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break;
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}
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memset(ptr, 0, 8);
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if (sense_6) {
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ptr[2] = 0x00; // WP enable: 0x80
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i = 4;
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} else {
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ptr[3] = 0x00; // WP enable: 0x80
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i = 8;
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}
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switch (page_code) {
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default:
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// vendor-specific mode
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info->sense_key = 0x05;
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info->sense_asc = 0x24;
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info->sense_ascq = 0x00;
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return USB_STOR_TRANSPORT_FAILED;
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case 0x1:
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memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
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i += sizeof(rw_err_page);
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break;
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case 0x8:
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memcpy(ptr + i, cache_page, sizeof(cache_page));
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i += sizeof(cache_page);
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break;
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case 0x1B:
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memcpy(ptr + i, rbac_page, sizeof(rbac_page));
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i += sizeof(rbac_page);
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break;
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case 0x1C:
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memcpy(ptr + i, timer_page, sizeof(timer_page));
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i += sizeof(timer_page);
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break;
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case 0x3F: // retrieve all pages
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memcpy(ptr + i, timer_page, sizeof(timer_page));
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i += sizeof(timer_page);
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memcpy(ptr + i, rbac_page, sizeof(rbac_page));
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i += sizeof(rbac_page);
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memcpy(ptr + i, cache_page, sizeof(cache_page));
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i += sizeof(cache_page);
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memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
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i += sizeof(rw_err_page);
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break;
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}
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if (sense_6)
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ptr[0] = i - 1;
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else
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((__be16 *) ptr)[0] = cpu_to_be16(i - 2);
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usb_stor_set_xfer_buf(ptr, i, srb);
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return USB_STOR_TRANSPORT_GOOD;
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}
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static void datafab_info_destructor(void *extra)
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{
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// this routine is a placeholder...
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// currently, we don't allocate any extra memory so we're okay
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}
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// Transport for the Datafab MDCFE-B
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//
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int datafab_transport(struct scsi_cmnd * srb, struct us_data *us)
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{
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struct datafab_info *info;
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int rc;
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unsigned long block, blocks;
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unsigned char *ptr = us->iobuf;
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static unsigned char inquiry_reply[8] = {
|
|
0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
|
|
};
|
|
|
|
if (!us->extra) {
|
|
us->extra = kmalloc(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;
|
|
}
|
|
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);
|
|
|
|
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;
|
|
}
|