typedef struct Ctlr Ctlr;typedef struct Endpt Endpt;typedef struct Udev Udev;typedef struct Usbhost Usbhost; enum{	MaxUsb = 10,		/* max number of USB Host Controller Interfaces (Usbhost*) */	MaxUsbDev = 32,	/* max number of attached USB devices, including root hub (Udev*) */ 	/*	 * USB packet definitions... 	*/	TokIN = 0x69,	TokOUT = 0xE1,	TokSETUP = 0x2D, 	/* request type */	RH2D = 0<<7,	RD2H = 1<<7,	Rstandard = 0<<5,	Rclass = 1<<5,	Rvendor = 2<<5,	Rdevice = 0,	Rinterface = 1,	Rendpt = 2,	Rother = 3,}; #define Class(csp)		((csp)&0xff)#define Subclass(csp)	(((csp)>>8)&0xff)#define Proto(csp)		(((csp)>>16)&0xff)#define CSP(c, s, p)	((c) | ((s)<<8) | ((p)<<16)) /* * device endpoint */struct Endpt{	Ref;	Lock;	int		x;		/* index in Udev.ep */	int		id;		/* hardware endpoint address */	int		maxpkt;	/* maximum packet size (from endpoint descriptor) */	int		data01;	/* 0=DATA0, 1=DATA1 */	uchar	eof;	ulong	csp;	uchar	mode;	/* OREAD, OWRITE, ORDWR */	uchar	nbuf;	/* number of buffers allowed */	uchar	iso;	uchar	debug;	uchar	active;	/* listed for examination by interrupts */	int		setin;	/* ISO related: */	int		hz;	int		remain;	/* for packet size calculations */	int		samplesz;	int		sched;	/* schedule index; -1 if undefined or aperiodic */	int		pollms;	/* polling interval in msec */	int		psize;	/* (remaining) size of this packet */	int		off;		/* offset into packet */	/* Real-time iso stuff */	ulong	foffset;	/* file offset (to detect seeks) */	ulong	poffset;	/* offset of next packet to be queued */	ulong	toffset;	/* offset associated with time */	vlong	time;		/* timeassociated with offset */	int		buffered;	/* bytes captured but unread, or written but unsent */	/* end ISO stuff */ 	Udev*	dev;	/* owning device */ 	ulong	nbytes;	ulong	nblocks; 	void	*private; 	// all the rest could (should?) move to the driver private structure; except perhaps err	QLock	rlock;	Rendez	rr;	Queue*	rq;	QLock	wlock;	Rendez	wr;	Queue*	wq; 	int		ntd;	char*	err;		// needs to be global for unstall; fix? 	Endpt*	activef;	/* active endpoint list */}; /* device parameters */enum{	/* Udev.state */	Disabled = 0,	Attached,	Enabled,	Assigned,	Configured, 	/* Udev.class */	Noclass = 0,	Hubclass = 9,}; /* * active USB device */struct Udev{	Ref;	Lock;	Usbhost	*uh;	int		x;		/* index in usbdev[] */	int		busy;	int		state;	int		id;	uchar	port;		/* port number on connecting hub */	ulong	csp;	ushort	vid;		/* vendor id */	ushort	did;		/* product id */	int		ls;	int		npt;	Endpt*	ep[16];	/* active end points */	Udev*	ports;	/* active ports, if hub */	Udev*	next;		/* next device on this hub */}; /* * One of these per active Host Controller Interface (HCI) */struct Usbhost{	ISAConf;					/* hardware info */	int	tbdf;					/* type+busno+devno+funcno */ 	QLock;					/* protects namespace state */	int		idgen;			/* version number to distinguish new connections */	Udev*	dev[MaxUsbDev];	/* device endpoints managed by this HCI */ 	void	(*init)(Usbhost*);	void	(*interrupt)(Ureg*, void*); 	void	(*portinfo)(Usbhost*, char*, char*);	void	(*portreset)(Usbhost*, int);	void	(*portenable)(Usbhost*, int, int); 	void	(*epalloc)(Usbhost*, Endpt*);	void	(*epfree)(Usbhost*, Endpt*);	void	(*epopen)(Usbhost*, Endpt*);	void	(*epclose)(Usbhost*, Endpt*);	void	(*epmode)(Usbhost*, Endpt*); 	long	(*read)(Usbhost*, Endpt*, void*, long, vlong);	long	(*write)(Usbhost*, Endpt*, void*, long, vlong, int); 	void	*ctlr;}; extern void addusbtype(char*, int(*)(Usbhost*));