1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0+ */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Driver for USB Mass Storage compliant devices 4*4882a593Smuzhiyun * Protocol Functions Header File 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * Current development and maintenance by: 7*4882a593Smuzhiyun * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * This driver is based on the 'USB Mass Storage Class' document. This 10*4882a593Smuzhiyun * describes in detail the protocol used to communicate with such 11*4882a593Smuzhiyun * devices. Clearly, the designers had SCSI and ATAPI commands in 12*4882a593Smuzhiyun * mind when they created this document. The commands are all very 13*4882a593Smuzhiyun * similar to commands in the SCSI-II and ATAPI specifications. 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * It is important to note that in a number of cases this class 16*4882a593Smuzhiyun * exhibits class-specific exemptions from the USB specification. 17*4882a593Smuzhiyun * Notably the usage of NAK, STALL and ACK differs from the norm, in 18*4882a593Smuzhiyun * that they are used to communicate wait, failed and OK on commands. 19*4882a593Smuzhiyun * 20*4882a593Smuzhiyun * Also, for certain devices, the interrupt endpoint is used to convey 21*4882a593Smuzhiyun * status of a command. 22*4882a593Smuzhiyun */ 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun #ifndef _PROTOCOL_H_ 25*4882a593Smuzhiyun #define _PROTOCOL_H_ 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun /* Protocol handling routines */ 28*4882a593Smuzhiyun extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*); 29*4882a593Smuzhiyun extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*); 30*4882a593Smuzhiyun extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*, 31*4882a593Smuzhiyun struct us_data*); 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun /* struct scsi_cmnd transfer buffer access utilities */ 34*4882a593Smuzhiyun enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF}; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer, 37*4882a593Smuzhiyun unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **, 38*4882a593Smuzhiyun unsigned int *offset, enum xfer_buf_dir dir); 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun extern void usb_stor_set_xfer_buf(unsigned char *buffer, 41*4882a593Smuzhiyun unsigned int buflen, struct scsi_cmnd *srb); 42*4882a593Smuzhiyun #endif 43