| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 |