diff options
Diffstat (limited to 'drivers/usb/storage/protocol.h')
| -rw-r--r-- | drivers/usb/storage/protocol.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/usb/storage/protocol.h b/drivers/usb/storage/protocol.h new file mode 100644 index 00000000000..02bff01ab09 --- /dev/null +++ b/drivers/usb/storage/protocol.h @@ -0,0 +1,74 @@ +/* Driver for USB Mass Storage compliant devices + * Protocol Functions Header File + * + * $Id: protocol.h,v 1.4 2001/02/13 07:10:03 mdharm Exp $ + * + * Current development and maintenance by: + * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) + * + * This driver is based on the 'USB Mass Storage Class' document. This + * describes in detail the protocol used to communicate with such + * devices. Clearly, the designers had SCSI and ATAPI commands in + * mind when they created this document. The commands are all very + * similar to commands in the SCSI-II and ATAPI specifications. + * + * It is important to note that in a number of cases this class + * exhibits class-specific exemptions from the USB specification. + * Notably the usage of NAK, STALL and ACK differs from the norm, in + * that they are used to communicate wait, failed and OK on commands. + * + * Also, for certain devices, the interrupt endpoint is used to convey + * status of a command. + * + * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more + * information about this driver. + * + * 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. + */ + +#ifndef _PROTOCOL_H_ +#define _PROTOCOL_H_ + +/* Sub Classes */ + +#define US_SC_RBC 0x01 /* Typically, flash devices */ +#define US_SC_8020 0x02 /* CD-ROM */ +#define US_SC_QIC 0x03 /* QIC-157 Tapes */ +#define US_SC_UFI 0x04 /* Floppy */ +#define US_SC_8070 0x05 /* Removable media */ +#define US_SC_SCSI 0x06 /* Transparent */ +#define US_SC_ISD200 0x07 /* ISD200 ATA */ +#define US_SC_MIN US_SC_RBC +#define US_SC_MAX US_SC_ISD200 + +#define US_SC_DEVICE 0xff /* Use device's value */ + +/* Protocol handling routines */ +extern void usb_stor_ATAPI_command(struct scsi_cmnd*, struct us_data*); +extern void usb_stor_qic157_command(struct scsi_cmnd*, struct us_data*); +extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*); +extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*, + struct us_data*); + +/* struct scsi_cmnd transfer buffer access utilities */ +enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF}; + +extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer, + unsigned int buflen, struct scsi_cmnd *srb, unsigned int *index, + unsigned int *offset, enum xfer_buf_dir dir); + +extern void usb_stor_set_xfer_buf(unsigned char *buffer, + unsigned int buflen, struct scsi_cmnd *srb); +#endif |