// SPDX-License-Identifier: GPL-2.0+ /* * Driver for Datafab USB Compact Flash reader * * datafab driver v0.1: * * First release * * Current development and maintenance by: * (c) 2000 Jimmie Mayfield (mayfield+datafab@sackheads.org) * * Many thanks to Robert Baruch for the SanDisk SmartMedia reader driver * which I used as a template for this driver. * * Some bugfixes and scatter-gather code by Gregory P. Smith * (greg-usb@electricrain.com) * * Fix for media change by Joerg Schneider (js@joergschneider.com) * * Other contributors: * (c) 2002 Alan Stern <stern@rowland.org>
*/
/* * This driver attempts to support USB CompactFlash reader/writer devices * based on Datafab USB-to-ATA chips. It was specifically developed for the * Datafab MDCFE-B USB CompactFlash reader but has since been found to work * with a variety of Datafab-based devices from a number of manufacturers. * I've received a report of this driver working with a Datafab-based * SmartMedia device though please be aware that I'm personally unable to * test SmartMedia support. * * This driver supports reading and writing. If you're truly paranoid, * however, you can force the driver into a write-protected state by setting * the WP enable bits in datafab_handle_mode_sense(). See the comments * in that routine.
*/
MODULE_DESCRIPTION("Driver for Datafab USB Compact Flash reader");
MODULE_AUTHOR("Jimmie Mayfield ");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("USB_STORAGE");
struct datafab_info { unsignedlong sectors; /* total sector count */ unsignedlong ssize; /* sector size in bytes */ signedchar lun; /* used for dual-slot readers */
/* the following aren't used yet */ unsignedchar sense_key; unsignedlong sense_asc; /* additional sense code */ unsignedlong sense_ascq; /* additional sense code qualifier */
};
// we're working in LBA mode. according to the ATA spec, // we can support up to 28-bit addressing. I don't know if Datafab // supports beyond 24-bit addressing. It's kind of hard to test // since it requires > 8GB CF card. // if (sectors > 0x0FFFFFFF) return USB_STOR_TRANSPORT_ERROR;
if (info->lun == -1) {
result = datafab_determine_lun(us, info); if (result != USB_STOR_TRANSPORT_GOOD) return result;
}
totallen = sectors * info->ssize;
// Since we don't read more than 64 KB at a time, we have to create // a bounce buffer and move the data a piece at a time between the // bounce buffer and the actual transfer buffer.
// we're working in LBA mode. according to the ATA spec, // we can support up to 28-bit addressing. I don't know if Datafab // supports beyond 24-bit addressing. It's kind of hard to test // since it requires > 8GB CF card. // if (sectors > 0x0FFFFFFF) return USB_STOR_TRANSPORT_ERROR;
if (info->lun == -1) {
result = datafab_determine_lun(us, info); if (result != USB_STOR_TRANSPORT_GOOD) return result;
}
totallen = sectors * info->ssize;
// Since we don't write more than 64 KB at a time, we have to create // a bounce buffer and move the data a piece at a time between the // bounce buffer and the actual transfer buffer.
staticint 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?
staticint 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... // staticconstunsignedchar scommand[8] = { 0, 1, 0, 0, 0, 0xa0, 0xec, 1 }; unsignedchar *command = us->iobuf; unsignedchar *reply; int rc;
if (!info) return USB_STOR_TRANSPORT_ERROR;
if (info->lun == -1) {
rc = datafab_determine_lun(us, info); if (rc != USB_STOR_TRANSPORT_GOOD) return rc;
}
// most of this stuff is just a hack to get things working. the // datafab reader doesn't present a SCSI interface so we // fudge the SCSI commands... //
pc = srb->cmnd[2] >> 6;
page_code = srb->cmnd[2] & 0x3F;
switch (pc) { case 0x0:
usb_stor_dbg(us, "Current values\n"); break; case 0x1:
usb_stor_dbg(us, "Changeable values\n"); break; case 0x2:
usb_stor_dbg(us, "Default values\n"); break; case 0x3:
usb_stor_dbg(us, "Saves values\n"); break;
}
memset(ptr, 0, 8); if (sense_6) {
ptr[2] = 0x00; // WP enable: 0x80
i = 4;
} else {
ptr[3] = 0x00; // WP enable: 0x80
i = 8;
}
case 0x1:
memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
i += sizeof(rw_err_page); break;
case 0x8:
memcpy(ptr + i, cache_page, sizeof(cache_page));
i += sizeof(cache_page); break;
case 0x1B:
memcpy(ptr + i, rbac_page, sizeof(rbac_page));
i += sizeof(rbac_page); break;
case 0x1C:
memcpy(ptr + i, timer_page, sizeof(timer_page));
i += sizeof(timer_page); break;
case 0x3F: // retrieve all pages
memcpy(ptr + i, timer_page, sizeof(timer_page));
i += sizeof(timer_page);
memcpy(ptr + i, rbac_page, sizeof(rbac_page));
i += sizeof(rbac_page);
memcpy(ptr + i, cache_page, sizeof(cache_page));
i += sizeof(cache_page);
memcpy(ptr + i, rw_err_page, sizeof(rw_err_page));
i += sizeof(rw_err_page); break;
}
if (sense_6)
ptr[0] = i - 1; else
((__be16 *) ptr)[0] = cpu_to_be16(i - 2);
usb_stor_set_xfer_buf(ptr, i, srb);
return USB_STOR_TRANSPORT_GOOD;
}
staticvoid 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 // staticint datafab_transport(struct scsi_cmnd *srb, struct us_data *us)
{ struct datafab_info *info; int rc; unsignedlong block, blocks; unsignedchar *ptr = us->iobuf; staticconstunsignedchar inquiry_reply[8] = {
0x00, 0x80, 0x00, 0x01, 0x1F, 0x00, 0x00, 0x00
};
if (!us->extra) {
us->extra = kzalloc(sizeof(struct datafab_info), GFP_NOIO); if (!us->extra) return USB_STOR_TRANSPORT_ERROR;
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;
usb_stor_dbg(us, "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);
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]));
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]));
// 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);
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
*/
usb_stor_dbg(us, "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;
}
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