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/*
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 * mass storage transport protocols and subclasses,
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 * from usb mass storage class specification overview rev 1.2
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 */
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typedef struct Umsc Umsc;
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typedef struct Ums Ums;
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typedef struct Cbw Cbw;			/* command block wrapper */
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typedef struct Csw Csw;			/* command status wrapper */
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enum
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{
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	Protocbi =	0,	/* control/bulk/interrupt; mainly floppies */
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	Protocb =	1,	/*   "  with no interrupt; mainly floppies */
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	Protobulk =	0x50,	/* bulk only */
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	Subrbc =	1,	/* reduced blk cmds */
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	Subatapi =	2,	/* cd/dvd using sff-8020i or mmc-2 cmd blks */
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	Subqic 	=	3,	/* QIC-157 tapes */
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	Subufi =	4,	/* floppy */
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	Sub8070 =	5,	/* removable media, atapi-like */
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	Subscsi =	6,	/* scsi transparent cmd set */
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	Subisd200 =	7,	/* ISD200 ATA */
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	Subdev =	0xff,	/* use device's value */
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	Umsreset =	0xFF,
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	Getmaxlun =	0xFE,
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//	Maxlun		= 256,
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	Maxlun		= 32,
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	CMreset = 1,
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	Pcmd = 0,
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	Pdata,
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	Pstatus,
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	CbwLen		= 31,
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	CbwDataIn	= 0x80,
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	CbwDataOut	= 0x00,
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	CswLen		= 13,
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	CswOk		= 0,
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	CswFailed	= 1,
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	CswPhaseErr	= 2,
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};
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/*
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 * corresponds to a lun.
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 * these are ~600+Maxiosize bytes each; ScsiReq is not tiny.
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 */
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struct Umsc
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{
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	ScsiReq;
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	uvlong	blocks;
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	vlong	capacity;
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	/* from setup */
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	char	*bufp;
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	long	off;		/* offset within a block */
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	long	nb;		/* byte count */
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	uchar 	rawcmd[16];
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	uchar	phase;
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	char	*inq;
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	Ums	*ums;
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	Usbfs	fs;
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	char	buf[Maxiosize];
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};
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struct Ums
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{
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	QLock;
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	Dev	*dev;
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	Dev	*epin;
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	Dev	*epout;
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	Umsc	*lun;
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	uchar	maxlun;
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	int	seq;
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	int	nerrs;
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	int	wrongresidues;
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};
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/*
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 * USB transparent SCSI devices
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 */
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struct Cbw
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{
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	char	signature[4];		/* "USBC" */
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	long	tag;
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	long	datalen;
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	uchar	flags;
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	uchar	lun;
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	uchar	len;
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	char	command[16];
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};
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struct Csw
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{
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	char	signature[4];		/* "USBS" */
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	long	tag;
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	long	dataresidue;
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	uchar	status;
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};
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int	diskmain(Dev*, int, char**);