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