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