145 lines
5.2 KiB
C
145 lines
5.2 KiB
C
/* Driver for USB Mass Storage compliant devices
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* Transport 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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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _TRANSPORT_H_
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#define _TRANSPORT_H_
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#include <linux/blkdev.h>
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/*
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* Bulk only data structures
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*/
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/* command block wrapper */
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struct bulk_cb_wrap {
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__le32 Signature; /* contains 'USBC' */
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__u32 Tag; /* unique per command id */
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__le32 DataTransferLength; /* size of data */
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__u8 Flags; /* direction in bit 0 */
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__u8 Lun; /* LUN normally 0 */
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__u8 Length; /* of of the CDB */
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__u8 CDB[16]; /* max command */
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};
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#define US_BULK_CB_WRAP_LEN 31
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#define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */
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#define US_BULK_FLAG_IN 1
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#define US_BULK_FLAG_OUT 0
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/* command status wrapper */
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struct bulk_cs_wrap {
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__le32 Signature; /* should = 'USBS' */
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__u32 Tag; /* same as original command */
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__le32 Residue; /* amount not transferred */
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__u8 Status; /* see below */
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__u8 Filler[18];
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};
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#define US_BULK_CS_WRAP_LEN 13
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#define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
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#define US_BULK_STAT_OK 0
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#define US_BULK_STAT_FAIL 1
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#define US_BULK_STAT_PHASE 2
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/* bulk-only class specific requests */
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#define US_BULK_RESET_REQUEST 0xff
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#define US_BULK_GET_MAX_LUN 0xfe
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/*
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* usb_stor_bulk_transfer_xxx() return codes, in order of severity
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*/
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#define USB_STOR_XFER_GOOD 0 /* good transfer */
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#define USB_STOR_XFER_SHORT 1 /* transferred less than expected */
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#define USB_STOR_XFER_STALLED 2 /* endpoint stalled */
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#define USB_STOR_XFER_LONG 3 /* device tried to send too much */
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#define USB_STOR_XFER_ERROR 4 /* transfer died in the middle */
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/*
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* Transport return codes
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*/
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#define USB_STOR_TRANSPORT_GOOD 0 /* Transport good, command good */
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#define USB_STOR_TRANSPORT_FAILED 1 /* Transport good, command failed */
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#define USB_STOR_TRANSPORT_NO_SENSE 2 /* Command failed, no auto-sense */
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#define USB_STOR_TRANSPORT_ERROR 3 /* Transport bad (i.e. device dead) */
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/*
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* We used to have USB_STOR_XFER_ABORTED and USB_STOR_TRANSPORT_ABORTED
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* return codes. But now the transport and low-level transfer routines
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* treat an abort as just another error (-ENOENT for a cancelled URB).
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* It is up to the invoke_transport() function to test for aborts and
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* distinguish them from genuine communication errors.
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*/
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/*
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* CBI accept device specific command
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*/
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#define US_CBI_ADSC 0
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extern int usb_stor_CBI_transport(struct scsi_cmnd *, struct us_data*);
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extern int usb_stor_CB_transport(struct scsi_cmnd *, struct us_data*);
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extern int usb_stor_CB_reset(struct us_data*);
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extern int usb_stor_Bulk_transport(struct scsi_cmnd *, struct us_data*);
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extern int usb_stor_Bulk_max_lun(struct us_data*);
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extern int usb_stor_Bulk_reset(struct us_data*);
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extern void usb_stor_invoke_transport(struct scsi_cmnd *, struct us_data*);
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extern void usb_stor_stop_transport(struct us_data*);
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extern int usb_stor_control_msg(struct us_data *us, unsigned int pipe,
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u8 request, u8 requesttype, u16 value, u16 index,
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void *data, u16 size, int timeout);
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extern int usb_stor_clear_halt(struct us_data *us, unsigned int pipe);
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extern int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe,
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u8 request, u8 requesttype, u16 value, u16 index,
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void *data, u16 size);
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extern int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
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void *buf, unsigned int length, unsigned int *act_len);
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extern int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe,
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void *buf, unsigned int length, int use_sg, int *residual);
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extern int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
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struct scsi_cmnd* srb);
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extern int usb_stor_port_reset(struct us_data *us);
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#endif
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