mirror of https://gitee.com/openkylin/linux.git
43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for USB Mass Storage compliant devices
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* Protocol Functions Header File
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*
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* Current development and maintenance by:
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* (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*/
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#ifndef _PROTOCOL_H_
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#define _PROTOCOL_H_
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/* Protocol handling routines */
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extern void usb_stor_pad12_command(struct scsi_cmnd*, struct us_data*);
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extern void usb_stor_ufi_command(struct scsi_cmnd*, struct us_data*);
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extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
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struct us_data*);
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/* struct scsi_cmnd transfer buffer access utilities */
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enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};
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extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
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unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
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unsigned int *offset, enum xfer_buf_dir dir);
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extern void usb_stor_set_xfer_buf(unsigned char *buffer,
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unsigned int buflen, struct scsi_cmnd *srb);
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#endif
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