1 // SPDX-License-Identifier: GPL-2.0+
3  * Driver for Datafab USB Compact Flash reader
15  *   Some bugfixes and scatter-gather code by Gregory P. Smith 
16  *   (greg-usb@electricrain.com)
26  * based on Datafab USB-to-ATA chips.  It was specifically developed for the 
27  * Datafab MDCFE-B USB CompactFlash reader but has since been found to work 
28  * with a variety of Datafab-based devices from a number of manufacturers.
29  * I've received a report of this driver working with a Datafab-based
34  * however, you can force the driver into a write-protected state by setting
52 #define DRV_NAME "ums-datafab"
54 MODULE_DESCRIPTION("Driver for Datafab USB Compact Flash reader");
62 	signed char	lun;		/* used for dual-slot readers */
119 	return usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,  in datafab_bulk_read()
130 	return usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,  in datafab_bulk_write()
140 	unsigned char *command = us->iobuf;  in datafab_read_data()
149 	// we can support up to 28-bit addressing.  I don't know if Datafab  in datafab_read_data()
150 	// supports beyond 24-bit addressing.  It's kind of hard to test   in datafab_read_data()
156 	if (info->lun == -1) {  in datafab_read_data()
162 	totallen = sectors * info->ssize;  in datafab_read_data()
175 		// (min(128k, 255*info->ssize) is the real limit)  in datafab_read_data()
178 		thistime = (len / info->ssize) & 0xff;  in datafab_read_data()
186 		command[5] = 0xE0 + (info->lun << 4);  in datafab_read_data()
202 		usb_stor_access_xfer_buf(buffer, len, us->srb,  in datafab_read_data()
206 		totallen -= len;  in datafab_read_data()
223 	unsigned char *command = us->iobuf;  in datafab_write_data()
224 	unsigned char *reply = us->iobuf;  in datafab_write_data()
233 	// we can support up to 28-bit addressing.  I don't know if Datafab  in datafab_write_data()
234 	// supports beyond 24-bit addressing.  It's kind of hard to test   in datafab_write_data()
240 	if (info->lun == -1) {  in datafab_write_data()
246 	totallen = sectors * info->ssize;  in datafab_write_data()
259 		// (min(128k, 255*info->ssize) is the real limit)  in datafab_write_data()
262 		thistime = (len / info->ssize) & 0xff;  in datafab_write_data()
265 		usb_stor_access_xfer_buf(buffer, len, us->srb,  in datafab_write_data()
274 		command[5] = 0xE0 + (info->lun << 4);  in datafab_write_data()
301 		totallen -= len;  in datafab_write_data()
316 	// Dual-slot readers can be thought of as dual-LUN devices.  in datafab_determine_lun()
323 	unsigned char *command = us->iobuf;  in datafab_determine_lun()
350 			info->lun = 0;  in datafab_determine_lun()
365 			info->lun = 1;  in datafab_determine_lun()
388 	unsigned char *command = us->iobuf;  in datafab_id_device()
395 	if (info->lun == -1) {  in datafab_id_device()
406 	command[5] += (info->lun << 4);  in datafab_id_device()
418 		// capacity is at word offset 57-58  in datafab_id_device()
420 		info->sectors = ((u32)(reply[117]) << 24) |   in datafab_id_device()
454 	struct datafab_info *info = (struct datafab_info *) (us->extra);  in datafab_handle_mode_sense()
455 	unsigned char *ptr = us->iobuf;  in datafab_handle_mode_sense()
462 	pc = srb->cmnd[2] >> 6;  in datafab_handle_mode_sense()
463 	page_code = srb->cmnd[2] & 0x3F;  in datafab_handle_mode_sense()
491 		// vendor-specific mode  in datafab_handle_mode_sense()
492 		info->sense_key = 0x05;  in datafab_handle_mode_sense()
493 		info->sense_asc = 0x24;  in datafab_handle_mode_sense()
494 		info->sense_ascq = 0x00;  in datafab_handle_mode_sense()
530 		ptr[0] = i - 1;  in datafab_handle_mode_sense()
532 		((__be16 *) ptr)[0] = cpu_to_be16(i - 2);  in datafab_handle_mode_sense()
545 // Transport for the Datafab MDCFE-B
552 	unsigned char *ptr = us->iobuf;  in datafab_transport()
557 	if (!us->extra) {  in datafab_transport()
558 		us->extra = kzalloc_obj(struct datafab_info, GFP_NOIO);  in datafab_transport()
559 		if (!us->extra)  in datafab_transport()
562 		us->extra_destructor = datafab_info_destructor;  in datafab_transport()
563   		((struct datafab_info *)us->extra)->lun = -1;  in datafab_transport()
566 	info = (struct datafab_info *) (us->extra);  in datafab_transport()
568 	if (srb->cmnd[0] == INQUIRY) {  in datafab_transport()
569 		usb_stor_dbg(us, "INQUIRY - Returning bogus response\n");  in datafab_transport()
575 	if (srb->cmnd[0] == READ_CAPACITY) {  in datafab_transport()
576 		info->ssize = 0x200;  // hard coded 512 byte sectors as per ATA spec  in datafab_transport()
582 			     info->sectors, info->ssize);  in datafab_transport()
586 		((__be32 *) ptr)[0] = cpu_to_be32(info->sectors - 1);  in datafab_transport()
587 		((__be32 *) ptr)[1] = cpu_to_be32(info->ssize);  in datafab_transport()
593 	if (srb->cmnd[0] == MODE_SELECT_10) {  in datafab_transport()
600 	if (srb->cmnd[0] == READ_10) {  in datafab_transport()
601 		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |  in datafab_transport()
602 			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));  in datafab_transport()
604 		blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));  in datafab_transport()
611 	if (srb->cmnd[0] == READ_12) {  in datafab_transport()
614 		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |  in datafab_transport()
615 			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));  in datafab_transport()
617 		blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |  in datafab_transport()
618 			 ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));  in datafab_transport()
625 	if (srb->cmnd[0] == WRITE_10) {  in datafab_transport()
626 		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |  in datafab_transport()
627 			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));  in datafab_transport()
629 		blocks = ((u32)(srb->cmnd[7]) << 8) | ((u32)(srb->cmnd[8]));  in datafab_transport()
636 	if (srb->cmnd[0] == WRITE_12) {  in datafab_transport()
639 		block = ((u32)(srb->cmnd[2]) << 24) | ((u32)(srb->cmnd[3]) << 16) |  in datafab_transport()
640 			((u32)(srb->cmnd[4]) <<  8) | ((u32)(srb->cmnd[5]));  in datafab_transport()
642 		blocks = ((u32)(srb->cmnd[6]) << 24) | ((u32)(srb->cmnd[7]) << 16) |  in datafab_transport()
643 			 ((u32)(srb->cmnd[8]) <<  8) | ((u32)(srb->cmnd[9]));  in datafab_transport()
650 	if (srb->cmnd[0] == TEST_UNIT_READY) {  in datafab_transport()
655 	if (srb->cmnd[0] == REQUEST_SENSE) {  in datafab_transport()
656 		usb_stor_dbg(us, "REQUEST_SENSE - Returning faked response\n");  in datafab_transport()
664 		ptr[2] = info->sense_key;  in datafab_transport()
666 		ptr[12] = info->sense_asc;  in datafab_transport()
667 		ptr[13] = info->sense_ascq;  in datafab_transport()
673 	if (srb->cmnd[0] == MODE_SENSE) {  in datafab_transport()
678 	if (srb->cmnd[0] == MODE_SENSE_10) {  in datafab_transport()
683 	if (srb->cmnd[0] == ALLOW_MEDIUM_REMOVAL) {  in datafab_transport()
691 	if (srb->cmnd[0] == START_STOP) {  in datafab_transport()
703 			info->sense_key = NO_SENSE;  in datafab_transport()
704 			srb->result = SUCCESS;  in datafab_transport()
706 			info->sense_key = UNIT_ATTENTION;  in datafab_transport()
707 			srb->result = SAM_STAT_CHECK_CONDITION;  in datafab_transport()
713 		     srb->cmnd[0], srb->cmnd[0]);  in datafab_transport()
714 	info->sense_key = 0x05;  in datafab_transport()
715 	info->sense_asc = 0x20;  in datafab_transport()
716 	info->sense_ascq = 0x00;  in datafab_transport()
729 			(id - datafab_usb_ids) + datafab_unusual_dev_list,  in datafab_probe()
734 	us->transport_name  = "Datafab Bulk-Only";  in datafab_probe()
735 	us->transport = datafab_transport;  in datafab_probe()
736 	us->transport_reset = usb_stor_Bulk_reset;  in datafab_probe()
737 	us->max_lun = 1;  in datafab_probe()