| /* 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 |
