1 /* 2 * Driver for USB Mass Storage compliant devices 3 * Protocol Functions Header File 4 * 5 * Current development and maintenance by: 6 * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 7 * 8 * This driver is based on the 'USB Mass Storage Class' document. This 9 * describes in detail the protocol used to communicate with such 10 * devices. Clearly, the designers had SCSI and ATAPI commands in 11 * mind when they created this document. The commands are all very 12 * similar to commands in the SCSI-II and ATAPI specifications. 13 * 14 * It is important to note that in a number of cases this class 15 * exhibits class-specific exemptions from the USB specification. 16 * Notably the usage of NAK, STALL and ACK differs from the norm, in 17 * that they are used to communicate wait, failed and OK on commands. 18 * 19 * Also, for certain devices, the interrupt endpoint is used to convey 20 * status of a command. 21 * 22 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more 23 * information about this driver. 24 * 25 * This program is free software; you can redistribute it and/or modify it 26 * under the terms of the GNU General Public License as published by the 27 * Free Software Foundation; either version 2, or (at your option) any 28 * later version. 29 * 30 * This program is distributed in the hope that it will be useful, but 31 * WITHOUT ANY WARRANTY; without even the implied warranty of 32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 33 * General Public License for more details. 34 * 35 * You should have received a copy of the GNU General Public License along 36 * with this program; if not, write to the Free Software Foundation, Inc., 37 * 675 Mass Ave, Cambridge, MA 02139, USA. 38 */ 39 40 #ifndef _PROTOCOL_H_ 41 #define _PROTOCOL_H_ 42 43 /* Protocol handling routines */ 44 extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*); 45 extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*); 46 extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*, 47 struct us_data*); 48 49 /* struct scsi_cmnd transfer buffer access utilities */ 50 enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF}; 51 52 extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer, 53 unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **, 54 unsigned int *offset, enum xfer_buf_dir dir); 55 56 extern void usb_stor_set_xfer_buf(unsigned char *buffer, 57 unsigned int buflen, struct scsi_cmnd *srb); 58 #endif 59