[linux-2.6-block.git] / drivers / usb / storage / transport.h

/* 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
Commit	Line	Data
1da177e4 LT	1	/* Driver for USB Mass Storage compliant devices
	2	* Transport Functions Header File
	3	*
1da177e4 LT	4	* Current development and maintenance by:
	5	* (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
	6	*
	7	* This driver is based on the 'USB Mass Storage Class' document. This
	8	* describes in detail the protocol used to communicate with such
	9	* devices. Clearly, the designers had SCSI and ATAPI commands in
	10	* mind when they created this document. The commands are all very
	11	* similar to commands in the SCSI-II and ATAPI specifications.
	12	*
	13	* It is important to note that in a number of cases this class
	14	* exhibits class-specific exemptions from the USB specification.
	15	* Notably the usage of NAK, STALL and ACK differs from the norm, in
	16	* that they are used to communicate wait, failed and OK on commands.
	17	*
	18	* Also, for certain devices, the interrupt endpoint is used to convey
	19	* status of a command.
	20	*
	21	* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
	22	* information about this driver.
	23	*
	24	* This program is free software; you can redistribute it and/or modify it
	25	* under the terms of the GNU General Public License as published by the
	26	* Free Software Foundation; either version 2, or (at your option) any
	27	* later version.
	28	*
	29	* This program is distributed in the hope that it will be useful, but
	30	* WITHOUT ANY WARRANTY; without even the implied warranty of
	31	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	32	* General Public License for more details.
	33	*
	34	* You should have received a copy of the GNU General Public License along
	35	* with this program; if not, write to the Free Software Foundation, Inc.,
	36	* 675 Mass Ave, Cambridge, MA 02139, USA.
	37	*/
	38
	39	#ifndef _TRANSPORT_H_
	40	#define _TRANSPORT_H_
	41
1da177e4 LT	42	#include <linux/blkdev.h>
1da177e4 LT	43
1da177e4 LT	44	/*
	45	* Bulk only data structures
	46	*/
	47
	48	/* command block wrapper */
	49	struct bulk_cb_wrap {
	50	__le32 Signature; /* contains 'USBC' */
	51	__u32 Tag; /* unique per command id */
	52	__le32 DataTransferLength; /* size of data */
	53	__u8 Flags; /* direction in bit 0 */
	54	__u8 Lun; /* LUN normally 0 */
	55	__u8 Length; /* of of the CDB */
	56	__u8 CDB[16]; /* max command */
	57	};
	58
	59	#define US_BULK_CB_WRAP_LEN 31
	60	#define US_BULK_CB_SIGN 0x43425355 /spells out USBC /
	61	#define US_BULK_FLAG_IN 1
	62	#define US_BULK_FLAG_OUT 0
	63
	64	/* command status wrapper */
	65	struct bulk_cs_wrap {
	66	__le32 Signature; /* should = 'USBS' */
	67	__u32 Tag; /* same as original command */
	68	__le32 Residue; /* amount not transferred */
	69	__u8 Status; /* see below */
	70	__u8 Filler[18];
	71	};
	72
	73	#define US_BULK_CS_WRAP_LEN 13
	74	#define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
	75	#define US_BULK_STAT_OK 0
	76	#define US_BULK_STAT_FAIL 1
	77	#define US_BULK_STAT_PHASE 2
	78
	79	/* bulk-only class specific requests */
	80	#define US_BULK_RESET_REQUEST 0xff
	81	#define US_BULK_GET_MAX_LUN 0xfe
	82
	83	/*
	84	* usb_stor_bulk_transfer_xxx() return codes, in order of severity
	85	*/
	86
	87	#define USB_STOR_XFER_GOOD 0 /* good transfer */
	88	#define USB_STOR_XFER_SHORT 1 /* transferred less than expected */
	89	#define USB_STOR_XFER_STALLED 2 /* endpoint stalled */
	90	#define USB_STOR_XFER_LONG 3 /* device tried to send too much */
	91	#define USB_STOR_XFER_ERROR 4 /* transfer died in the middle */
	92
	93	/*
	94	* Transport return codes
	95	*/
	96
	97	#define USB_STOR_TRANSPORT_GOOD 0 /* Transport good, command good */
	98	#define USB_STOR_TRANSPORT_FAILED 1 /* Transport good, command failed */
	99	#define USB_STOR_TRANSPORT_NO_SENSE 2 /* Command failed, no auto-sense */
	100	#define USB_STOR_TRANSPORT_ERROR 3 /* Transport bad (i.e. device dead) */
	101
	102	/*
	103	* We used to have USB_STOR_XFER_ABORTED and USB_STOR_TRANSPORT_ABORTED
	104	* return codes. But now the transport and low-level transfer routines
	105	* treat an abort as just another error (-ENOENT for a cancelled URB).
	106	* It is up to the invoke_transport() function to test for aborts and
	107	* distinguish them from genuine communication errors.
108	*/
109
110	/*
111	* CBI accept device specific command
112	*/
113
114	#define US_CBI_ADSC 0
115
1da177e4 LT	116	extern int usb_stor_CB_transport(struct scsi_cmnd , struct us_data);
	117	extern int usb_stor_CB_reset(struct us_data*);
	118
	119	extern int usb_stor_Bulk_transport(struct scsi_cmnd , struct us_data);
	120	extern int usb_stor_Bulk_max_lun(struct us_data*);
	121	extern int usb_stor_Bulk_reset(struct us_data*);
	122
	123	extern void usb_stor_invoke_transport(struct scsi_cmnd , struct us_data);
	124	extern void usb_stor_stop_transport(struct us_data*);
	125
	126	extern int usb_stor_control_msg(struct us_data *us, unsigned int pipe,
	127	u8 request, u8 requesttype, u16 value, u16 index,
	128	void *data, u16 size, int timeout);
	129	extern int usb_stor_clear_halt(struct us_data *us, unsigned int pipe);
	130
	131	extern int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe,
	132	u8 request, u8 requesttype, u16 value, u16 index,
	133	void *data, u16 size);
	134	extern int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
	135	void buf, unsigned int length, unsigned int act_len);
	136	extern int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe,
	137	void buf, unsigned int length, int use_sg, int residual);
6d416e61 BH	138	extern int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
6d416e61 BH	139	struct scsi_cmnd* srb);
1da177e4	140
4d07ef76	141	extern int usb_stor_port_reset(struct us_data *us);
1da177e4	142	#endif