75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
/* Driver for USB Mass Storage compliant devices
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* Protocol Functions Header File
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*
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* $Id: protocol.h,v 1.4 2001/02/13 07:10:03 mdharm Exp $
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*
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* Current development and maintenance by:
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* (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*
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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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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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#ifndef _PROTOCOL_H_
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#define _PROTOCOL_H_
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/* Sub Classes */
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#define US_SC_RBC 0x01 /* Typically, flash devices */
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#define US_SC_8020 0x02 /* CD-ROM */
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#define US_SC_QIC 0x03 /* QIC-157 Tapes */
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#define US_SC_UFI 0x04 /* Floppy */
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#define US_SC_8070 0x05 /* Removable media */
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#define US_SC_SCSI 0x06 /* Transparent */
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#define US_SC_ISD200 0x07 /* ISD200 ATA */
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#define US_SC_MIN US_SC_RBC
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#define US_SC_MAX US_SC_ISD200
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#define US_SC_DEVICE 0xff /* Use device's value */
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/* Protocol handling routines */
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extern void usb_stor_ATAPI_command(struct scsi_cmnd*, struct us_data*);
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extern void usb_stor_qic157_command(struct scsi_cmnd*, struct us_data*);
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extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*);
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extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
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struct us_data*);
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/* struct scsi_cmnd transfer buffer access utilities */
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enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
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extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
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unsigned int buflen, struct scsi_cmnd *srb, unsigned int *index,
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unsigned int *offset, enum xfer_buf_dir dir);
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extern void usb_stor_set_xfer_buf(unsigned char *buffer,
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unsigned int buflen, struct scsi_cmnd *srb);
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#endif
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