usb.h

* This driver is to be used as a skeleton driver to be able to create a * USB driver quickly. The

	int (*submit_urb) (struct urb* purb);
	int (*unlink_urb) (struct urb* purb);
};

#define DEVNUM_ROUND_ROBIN	/***** OPTION *****/

/*
 * Allocated per bus we have
 */
struct usb_bus {
	int busnum;			/* Bus number (in order of reg) */
	char *bus_name;			/* stable id (PCI slot_name etc) */

#ifdef DEVNUM_ROUND_ROBIN
	int devnum_next;                /* Next open device number in round-robin allocation */
#endif /* DEVNUM_ROUND_ROBIN */

	struct usb_devmap devmap;       /* Device map */
	struct usb_operations *op;      /* Operations (specific to the HC) */
	struct usb_device *root_hub;    /* Root hub */
	struct list_head bus_list;
	void *hcpriv;                   /* Host Controller private data */

	int bandwidth_allocated;	/* on this Host Controller; */
					  /* applies to Int. and Isoc. pipes; */
					  /* measured in microseconds/frame; */
					  /* range is 0..900, where 900 = */
					  /* 90% of a 1-millisecond frame */
	int bandwidth_int_reqs;		/* number of Interrupt requesters */
	int bandwidth_isoc_reqs;	/* number of Isoc. requesters */

	/* usbdevfs inode list */
	struct list_head inodes;

	atomic_t refcnt;
};

/*
 * As of USB 2.0, full/low speed devices are segregated into trees.
 * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
 * The other type grows from high speed hubs when they connect to
 * full/low speed devices using "Transaction Translators" (TTs).
 *
 * TTs should only be known to the hub driver, and high speed bus
 * drivers (only EHCI for now).  They affect periodic scheduling and
 * sometimes control/bulk error recovery.
 */
struct usb_tt {
	struct usb_device	*hub;	/* upstream highspeed hub */
	int			multi;	/* true means one TT per port */
};


/* This is arbitrary.
 * From USB 2.0 spec Table 11-13, offset 7, a hub can
 * have up to 255 ports. The most yet reported is 10.
 */
#define USB_MAXCHILDREN		(16)

struct usb_device {
	int		devnum;		/* Address on USB bus */
	char		devpath [16];	/* Use in messages: /port/port/... */

	enum {
		USB_SPEED_UNKNOWN = 0,			/* enumerating */
		USB_SPEED_LOW, USB_SPEED_FULL,		/* usb 1.1 */
		USB_SPEED_HIGH				/* usb 2.0 */
	} speed;

	struct usb_tt	*tt; 		/* low/full speed dev, highspeed hub */
	int		ttport;		/* device port on that tt hub */

	atomic_t refcnt;		/* Reference count */
	struct semaphore serialize;

	unsigned int toggle[2];		/* one bit for each endpoint ([0] = IN, [1] = OUT) */
	unsigned int halted[2];		/* endpoint halts; one bit per endpoint # & direction; */
					/* [0] = IN, [1] = OUT */
	int epmaxpacketin[16];		/* INput endpoint specific maximums */
	int epmaxpacketout[16];		/* OUTput endpoint specific maximums */

	struct usb_device *parent;
	struct usb_bus *bus;		/* Bus we're part of */

	struct usb_device_descriptor descriptor;/* Descriptor */
	struct usb_config_descriptor *config;	/* All of the configs */
	struct usb_config_descriptor *actconfig;/* the active configuration */

	char **rawdescriptors;		/* Raw descriptors for each config */

	int have_langid;		/* whether string_langid is valid yet */
	int string_langid;		/* language ID for strings */
  
	void *hcpriv;			/* Host Controller private data */
	
        /* usbdevfs inode list */
	struct list_head inodes;
	struct list_head filelist;

	/*
	 * Child devices - these can be either new devices
	 * (if this is a hub device), or different instances
	 * of this same device.
	 *
	 * Each instance needs its own set of data structures.
	 */

	int maxchild;			/* Number of ports if hub */
	struct usb_device *children[USB_MAXCHILDREN];
};

extern struct usb_interface *usb_ifnum_to_if(struct usb_device *dev, unsigned ifnum);
extern struct usb_endpoint_descriptor *usb_epnum_to_ep_desc(struct usb_device *dev, unsigned epnum);

extern int usb_register(struct usb_driver *);
extern void usb_deregister(struct usb_driver *);
extern void usb_scan_devices(void);

/* used these for multi-interface device registration */
extern void usb_driver_claim_interface(struct usb_driver *driver, struct usb_interface *iface, void* priv);
extern int usb_interface_claimed(struct usb_interface *iface);
extern void usb_driver_release_interface(struct usb_driver *driver, struct usb_interface *iface);
const struct usb_device_id *usb_match_id(struct usb_device *dev,
					 struct usb_interface *interface,
					 const struct usb_device_id *id);

extern struct usb_bus *usb_alloc_bus(struct usb_operations *);
extern void usb_free_bus(struct usb_bus *);
extern void usb_register_bus(struct usb_bus *);
extern void usb_deregister_bus(struct usb_bus *);

extern struct usb_device *usb_alloc_dev(struct usb_device *parent, struct usb_bus *);
extern void usb_free_dev(struct usb_device *);
extern void usb_inc_dev_use(struct usb_device *);
#define usb_dec_dev_use usb_free_dev

extern int usb_control_msg(struct usb_device *dev, unsigned int pipe, __u8 request, __u8 requesttype, __u16 value, __u16 index, void *data, __u16 size, int timeout);

extern int usb_root_hub_string(int id, int serial, char *type, __u8 *data, int len);
extern void usb_connect(struct usb_device *dev);
extern void usb_disconnect(struct usb_device **);

extern void usb_destroy_configuration(struct usb_device *dev);

int usb_get_current_frame_number (struct usb_device *usb_dev);


/**
 * usb_make_path - returns stable device path in the usb tree
 * @dev: the device whose path is being constructed
 * @buf: where to put the string
 * @size: how big is "buf"?
 *
 * Returns length of the string (> 0) or negative if size was too small.
 *
 * This identifier is intended to be "stable", reflecting physical paths in
 * hardware such as physical bus addresses for host controllers or ports on
 * USB hubs.  That makes it stay the same until systems are physically
 * reconfigured, by re-cabling a tree of USB devices or by moving USB host
 * controllers.  Adding and removing devices, including virtual root hubs
 * in host controller driver modules, does not change these path identifers;
 * neither does rebooting or re-enumerating.  These are more useful identifiers
 * than changeable ("unstable") ones like bus numbers or device addresses.
 * (The stability of the id depends on stability of the bus_name associated
 * with the bus the device uses; that is normally stable.)
 *
 * With a partial exception for devices connected to USB 2.0 root hubs, these
 * identifiers are also predictable.  So long as the device tree isn't changed,
 * plugging any USB device into a given hub port always gives it the same path.
 * Because of the use of "companion" controllers, devices connected to ports on
 * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
 * high speed, and a different one if they are full or low speed.
 */
static inline int usb_make_path (struct usb_device *dev, char *buf, size_t size)
{
	int actual;
	actual = snprintf (buf, size, "usb-%s-%s",
		dev->bus->bus_name, dev->devpath);
	return (actual >= size) ? -1 : actual;
}


/*
 * Calling this entity a "pipe" is glorifying it. A USB pipe
 * is something embarrassingly simple: it basically consists
 * of the following information:
 *  - device number (7 bits)
 *  - endpoint number (4 bits)
 *  - current Data0/1 state (1 bit)
 *  - direction (1 bit)
 *  - speed (1 bit)
 *  - max packet size (2 bits: 8, 16, 32 or 64) [Historical; now gone.]
 *  - pipe type (2 bits: control, interrupt, bulk, isochronous)
 *
 * That's 18 bits. Really. Nothing more. And the USB people have
 * documented these eighteen bits as some kind of glorious
 * virtual data structure.
 *
 * Let's not fall in that trap. We'll just encode it as a simple
 * unsigned int. The encoding is:
 *
 *  - max size:		bits 0-1	(00 = 8, 01 = 16, 10 = 32, 11 = 64) [Historical; now gone.]
 *  - direction:	bit 7		(0 = Host-to-Device [Out], 1 = Device-to-Host [In])
 *  - device:		bits 8-14
 *  - endpoint:		bits 15-18
 *  - Data0/1:		bit 19
 *  - speed:		bit 26		(0 = Full, 1 = Low Speed)
 *  - pipe type:	bits 30-31	(00 = isochronous, 01 = interrupt, 10 = control, 11 = bulk)
 *
 * Why? Because it's arbitrary, and whatever encoding we select is really
 * up to us. This one happens to share a lot of bit positions with the UHCI
 * specification, so that much of the uhci driver can just mask the bits
 * appropriately.
 *
 * NOTE:  there's no encoding (yet?) for a "high speed" endpoint; treat them
 * like full speed devices.
 */

#define PIPE_ISOCHRONOUS		0
#define PIPE_INTERRUPT			1
#define PIPE_CONTROL			2
#define PIPE_BULK			3

#define usb_maxpacket(dev, pipe, out)	(out \
				? (dev)->epmaxpacketout[usb_pipeendpoint(pipe)] \
				: (dev)->epmaxpacketin [usb_pipeendpoint(pipe)] )
#define usb_packetid(pipe)	(((pipe) & USB_DIR_IN) ? USB_PID_IN : USB_PID_OUT)

#define usb_pipeout(pipe)	((((pipe) >> 7) & 1) ^ 1)
#define usb_pipein(pipe)	(((pipe) >> 7) & 1)
#define usb_pipedevice(pipe)	(((pipe) >> 8) & 0x7f)
#define usb_pipe_endpdev(pipe)	(((pipe) >> 8) & 0x7ff)
#define usb_pipeendpoint(pipe)	(((pipe) >> 15) & 0xf)
#define usb_pipedata(pipe)	(((pipe) >> 19) & 1)
#define usb_pipeslow(pipe)	(((pipe) >> 26) & 1)
#define usb_pipetype(pipe)	(((pipe) >> 30) & 3)
#define usb_pipeisoc(pipe)	(usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
#define usb_pipeint(pipe)	(usb_pipetype((pipe)) == PIPE_INTERRUPT)
#define usb_pipecontrol(pipe)	(usb_pipetype((pipe)) == PIPE_CONTROL)
#define usb_pipebulk(pipe)	(usb_pipetype((pipe)) == PIPE_BULK)

#define PIPE_DEVEP_MASK		0x0007ff00

/* The D0/D1 toggle bits */
#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
#define	usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << (ep)))
static inline void usb_settoggle(struct usb_device *dev,
				 unsigned int ep, 
				 unsigned int out,
				 int bit)
{
	dev->toggle[out] &= ~(1 << ep);
	dev->toggle[out] |= bit << ep;
}

/* Endpoint halt control/status */
#define usb_endpoint_out(ep_dir)	(((ep_dir >> 7) & 1) ^ 1)
#define usb_endpoint_halt(dev, ep, out) ((dev)->halted[out] |= (1 << (ep)))
#define usb_endpoint_running(dev, ep, out) ((dev)->halted[out] &= ~(1 << (ep)))
#define usb_endpoint_halted(dev, ep, out) ((dev)->halted[out] & (1 << (ep)))

static inline unsigned int __create_pipe(struct usb_device *dev, unsigned int endpoint)
{
	return (dev->devnum << 8) | (endpoint << 15) |
		((dev->speed == USB_SPEED_LOW) << 26);
}

static inline unsigned int __default_pipe(struct usb_device *dev)
{
	return ((dev->speed == USB_SPEED_LOW) << 26);
}

/* Create various pipes... */
#define usb_sndctrlpipe(dev,endpoint)	((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint))
#define usb_rcvctrlpipe(dev,endpoint)	((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_sndisocpipe(dev,endpoint)	((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint))
#define usb_rcvisocpipe(dev,endpoint)	((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_sndbulkpipe(dev,endpoint)	((PIPE_BULK << 30) | __create_pipe(dev,endpoint))
#define usb_rcvbulkpipe(dev,endpoint)	((PIPE_BULK << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_sndintpipe(dev,endpoint)	((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint))
#define usb_rcvintpipe(dev,endpoint)	((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_snddefctrl(dev)		((PIPE_CONTROL << 30) | __default_pipe(dev))
#define usb_rcvdefctrl(dev)		((PIPE_CONTROL << 30) | __default_pipe(dev) | USB_DIR_IN)

/*
 * Send and receive control messages..
 */
int usb_new_device(struct usb_device *dev);
int usb_reset_device(struct usb_device *dev);
int usb_set_address(struct usb_device *dev);
int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
	unsigned char descindex, void *buf, int size);
int usb_get_class_descriptor(struct usb_device *dev, int ifnum, unsigned char desctype,
	unsigned char descindex, void *buf, int size);
int usb_get_device_descriptor(struct usb_device *dev);
int __usb_get_extra_descriptor(char *buffer, unsigned size, unsigned char type, void **ptr);
int usb_get_status(struct usb_device *dev, int type, int target, void *data);
int usb_get_configuration(struct usb_device *dev);
int usb_get_protocol(struct usb_device *dev, int ifnum);
int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol);
int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id);
int usb_set_configuration(struct usb_device *dev, int configuration);
int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
	unsigned char id, void *buf, int size);
int usb_set_report(struct usb_device *dev, int ifnum, unsigned char type,
	unsigned char id, void *buf, int size);
int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
int usb_clear_halt(struct usb_device *dev, int pipe);
void usb_set_maxpacket(struct usb_device *dev);

#define usb_get_extra_descriptor(ifpoint,type,ptr)\
	__usb_get_extra_descriptor((ifpoint)->extra,(ifpoint)->extralen,type,(void**)ptr)

/*
 * Debugging helpers..
 */
void usb_show_device_descriptor(struct usb_device_descriptor *);
void usb_show_config_descriptor(struct usb_config_descriptor *);
void usb_show_interface_descriptor(struct usb_interface_descriptor *);
void usb_show_endpoint_descriptor(struct usb_endpoint_descriptor *);
void usb_show_device(struct usb_device *);
void usb_show_string(struct usb_device *dev, char *id, int index);

#ifdef DEBUG
#define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif
#define err(format, arg...) printk(KERN_ERR __FILE__ ": " format "\n" , ## arg)
#define info(format, arg...) printk(KERN_INFO __FILE__ ": " format "\n" , ## arg)
#define warn(format, arg...) printk(KERN_WARNING __FILE__ ": " format "\n" , ## arg)


/*
 * bus and driver list
 */

extern struct list_head usb_driver_list;
extern struct list_head usb_bus_list;
extern struct semaphore usb_bus_list_lock;

/*
 * USB device fs stuff
 */

#ifdef CONFIG_USB_DEVICEFS

/*
 * these are expected to be called from the USB core/hub thread
 * with the kernel lock held
 */
extern void usbdevfs_add_bus(struct usb_bus *bus);
extern void usbdevfs_remove_bus(struct usb_bus *bus);
extern void usbdevfs_add_device(struct usb_device *dev);
extern void usbdevfs_remove_device(struct usb_device *dev);

extern int usbdevfs_init(void);
extern void usbdevfs_cleanup(void);

#else /* CONFIG_USB_DEVICEFS */

static inline void usbdevfs_add_bus(struct usb_bus *bus) {}
static inline void usbdevfs_remove_bus(struct usb_bus *bus) {}
static inline void usbdevfs_add_device(struct usb_device *dev) {}
static inline void usbdevfs_remove_device(struct usb_device *dev) {}

static inline int usbdevfs_init(void) { return 0; }
static inline void usbdevfs_cleanup(void) { }

#endif /* CONFIG_USB_DEVICEFS */

#endif  /* __KERNEL__ */

#endif