/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Driver for USB Mass Storage compliant devices
* Protocol Functions Header File
*
* 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 .
*/
#ifndef _PROTOCOL_H_
#define _PROTOCOL_H_
/* Protocol handling routines */
extern void usb_stor_pad12_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, struct scatterlist **,
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
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