include/usb/usb.h

/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 of
 * the License, 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 * Note: Part of this code has been derived from linux
 *
 */
#ifndef _USB_H_
#define _USB_H_

#ifndef DOXYGEN_SHOULD_SKIP_THIS

#include <driver.h>
#include <usb/usb_defs.h>
#include <asm/byteorder.h>

/* Everything is aribtrary */
#define USB_ALTSETTINGALLOC		4
#define USB_MAXALTSETTING		128	/* Hard limit */

#define USB_MAX_DEVICE			32
#define USB_MAXCONFIG			8
#define USB_MAXINTERFACES		8
#define USB_MAXENDPOINTS		16
#define USB_MAXCHILDREN			8	/* This is arbitrary */
#define USB_MAX_HUB			16

#define USB_CNTL_TIMEOUT 100 /* 100ms timeout */

/* String descriptor */
struct usb_string_descriptor {
	unsigned char	bLength;
	unsigned char	bDescriptorType;
	unsigned short	wData[1];
} __attribute__ ((packed));

/* device request (setup) */
struct devrequest {
	unsigned char	requesttype;
	unsigned char	request;
	unsigned short	value;
	unsigned short	index;
	unsigned short	length;
} __attribute__ ((packed));

/* All standard descriptors have these 2 fields in common */
struct usb_descriptor_header {
	unsigned char	bLength;
	unsigned char	bDescriptorType;
} __attribute__ ((packed));

/* Device descriptor */
struct usb_device_descriptor {
	unsigned char	bLength;
	unsigned char	bDescriptorType;
	unsigned short	bcdUSB;
	unsigned char	bDeviceClass;
	unsigned char	bDeviceSubClass;
	unsigned char	bDeviceProtocol;
	unsigned char	bMaxPacketSize0;
	unsigned short	idVendor;
	unsigned short	idProduct;
	unsigned short	bcdDevice;
	unsigned char	iManufacturer;
	unsigned char	iProduct;
	unsigned char	iSerialNumber;
	unsigned char	bNumConfigurations;
} __attribute__ ((packed));

/* Endpoint descriptor */
struct usb_endpoint_descriptor {
	unsigned char	bLength;
	unsigned char	bDescriptorType;
	unsigned char	bEndpointAddress;
	unsigned char	bmAttributes;
	unsigned short	wMaxPacketSize;
	unsigned char	bInterval;
	unsigned char	bRefresh;
	unsigned char	bSynchAddress;
} __attribute__ ((packed)) __attribute__ ((aligned(2)));

/* Interface descriptor */
struct usb_interface_descriptor {
	unsigned char	bLength;
	unsigned char	bDescriptorType;
	unsigned char	bInterfaceNumber;
	unsigned char	bAlternateSetting;
	unsigned char	bNumEndpoints;
	unsigned char	bInterfaceClass;
	unsigned char	bInterfaceSubClass;
	unsigned char	bInterfaceProtocol;
	unsigned char	iInterface;

	unsigned char	no_of_ep;
	unsigned char	num_altsetting;
	unsigned char	act_altsetting;

	struct usb_endpoint_descriptor ep_desc[USB_MAXENDPOINTS];
} __attribute__ ((packed));


/* Configuration descriptor information.. */
struct usb_config_descriptor {
	unsigned char	bLength;
	unsigned char	bDescriptorType;
	unsigned short	wTotalLength;
	unsigned char	bNumInterfaces;
	unsigned char	bConfigurationValue;
	unsigned char	iConfiguration;
	unsigned char	bmAttributes;
	unsigned char	MaxPower;

	unsigned char	no_of_if;	/* number of interfaces */
	struct usb_interface_descriptor if_desc[USB_MAXINTERFACES];
} __attribute__ ((packed));

enum {
	/* Maximum packet size; encoded as 0,1,2,3 = 8,16,32,64 */
	PACKET_SIZE_8   = 0,
	PACKET_SIZE_16  = 1,
	PACKET_SIZE_32  = 2,
	PACKET_SIZE_64  = 3,
};

struct usb_device {
	int	devnum;			/* Device number on USB bus */
	int	speed;			/* full/low/high */
	char	mf[32];			/* manufacturer */
	char	prod[32];		/* product */
	char	serial[32];		/* serial number */

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

	int configno;			/* selected config number */
	struct usb_device_descriptor descriptor; /* Device Descriptor */
	struct usb_config_descriptor config; /* config descriptor */

	int have_langid;		/* whether string_langid is valid yet */
	int string_langid;		/* language ID for strings */
	/*
	 * Child devices -  if this is a hub device
	 * Each instance needs its own set of data structures.
	 */
	unsigned long status;
	int act_len;			/* transfered bytes */
	int maxchild;			/* Number of ports if hub */
	int portnr;
	struct usb_device *parent;
	struct usb_device *children[USB_MAXCHILDREN];

	struct device_d dev;

	struct usb_host *host;

	struct list_head list;
	void *drv_data;
	struct usb_hub_device *hub;
};

struct usb_device_id;

struct usb_driver {
	char	*name;
	int     (*probe) (struct usb_device *, const struct usb_device_id *);
	void    (*disconnect)(struct usb_device *);

	const struct usb_device_id *id_table;

	struct driver_d driver;
};

extern struct bus_type usb_bus_type;

int usb_driver_register(struct usb_driver *);
int usb_driver_unregister(struct usb_driver *);

struct usb_host {
	int (*init)(struct usb_host *);
	int (*exit)(struct usb_host *);
	int (*submit_bulk_msg)(struct usb_device *dev, unsigned long pipe,
			void *buffer, int transfer_len);
	int (*submit_control_msg)(struct usb_device *dev, unsigned long pipe, void *buffer,
			int transfer_len, struct devrequest *setup);
	int (*submit_int_msg)(struct usb_device *dev, unsigned long pipe, void *buffer,
			int transfer_len, int interval);
	void (*usb_event_poll)(void);

	struct list_head list;

	int busnum;
};

int usb_register_host(struct usb_host *);

/* Defines */
#define USB_UHCI_VEND_ID	0x8086
#define USB_UHCI_DEV_ID		0x7112

int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol);
int usb_set_idle(struct usb_device *dev, int ifnum, int duration,
			int report_id);
struct usb_device *usb_get_dev_index(int index);
int usb_control_msg(struct usb_device *dev, unsigned int pipe,
			unsigned char request, unsigned char requesttype,
			unsigned short value, unsigned short index,
			void *data, unsigned short size, int timeout);
int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
			void *data, int len, int *actual_length, int timeout);
int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
			void *buffer, int transfer_len, int interval);
void usb_disable_asynch(int disable);
int usb_maxpacket(struct usb_device *dev, unsigned long pipe);
static inline void wait_ms(unsigned long ms)
{
	mdelay(ms);
};
int usb_get_configuration_no(struct usb_device *dev, unsigned char *buffer,
				int cfgno);
int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
			unsigned char id, void *buf, int size);
int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
			unsigned char type, unsigned char id, void *buf,
			int size);
int usb_clear_halt(struct usb_device *dev, int pipe);
int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
int usb_set_interface(struct usb_device *dev, int interface, int alternate);

void usb_rescan(void);

/* big endian -> little endian conversion */
/* some CPUs are already little endian e.g. the ARM920T */
#define __swap_16(x) \
	({ unsigned short x_ = (unsigned short)x; \
	 (unsigned short)( \
		((x_ & 0x00FFU) << 8) | ((x_ & 0xFF00U) >> 8)); \
	})
#define __swap_32(x) \
	({ unsigned long x_ = (unsigned long)x; \
	 (unsigned long)( \
		((x_ & 0x000000FFUL) << 24) | \
		((x_ & 0x0000FF00UL) <<	 8) | \
		((x_ & 0x00FF0000UL) >>	 8) | \
		((x_ & 0xFF000000UL) >> 24)); \
	})

#if __BYTE_ORDER == __LITTLE_ENDIAN
# define swap_16(x) (x)
# define swap_32(x) (x)
#else
# define swap_16(x) __swap_16(x)
# define swap_32(x) __swap_32(x)
#endif

/*
 * 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 (2 bits)
 *  - max packet size (2 bits: 8, 16, 32 or 64)
 *  - 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)
 *  - 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, 2 = High)
 *  - 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.
 */
/* Create various pipes... */
#define create_pipe(dev,endpoint) \
		(((dev)->devnum << 8) | ((endpoint) << 15) | \
		((dev)->speed << 26) | (dev)->maxpacketsize)
#define default_pipe(dev) ((dev)->speed << 26)

#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)

/* 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))
#define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = \
						((dev)->toggle[out] & \
						 ~(1 << ep)) | ((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)))

#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_pipespeed(pipe)	(((pipe) >> 26) & 3)
#define usb_pipeslow(pipe)	(usb_pipespeed(pipe) == USB_SPEED_LOW)
#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)


/*************************************************************************
 * Hub Stuff
 */
struct usb_port_status {
	unsigned short wPortStatus;
	unsigned short wPortChange;
} __attribute__ ((packed));

struct usb_hub_status {
	unsigned short wHubStatus;
	unsigned short wHubChange;
} __attribute__ ((packed));


/* Hub descriptor */
struct usb_hub_descriptor {
	unsigned char  bLength;
	unsigned char  bDescriptorType;
	unsigned char  bNbrPorts;
	unsigned short wHubCharacteristics;
	unsigned char  bPwrOn2PwrGood;
	unsigned char  bHubContrCurrent;
	unsigned char  DeviceRemovable[(USB_MAXCHILDREN+1+7)/8];
	unsigned char  PortPowerCtrlMask[(USB_MAXCHILDREN+1+7)/8];
	/* DeviceRemovable and PortPwrCtrlMask want to be variable-length
	   bitmaps that hold max 255 entries. (bit0 is ignored) */
} __attribute__ ((packed));


struct usb_hub_device {
	struct usb_device *pusb_dev;
	struct usb_hub_descriptor desc;
};

/**
 * struct usb_device_id - identifies USB devices for probing and hotplugging
 * @match_flags: Bit mask controlling of the other fields are used to match
 *	against new devices.  Any field except for driver_info may be used,
 *	although some only make sense in conjunction with other fields.
 *	This is usually set by a USB_DEVICE_*() macro, which sets all
 *	other fields in this structure except for driver_info.
 * @idVendor: USB vendor ID for a device; numbers are assigned
 *	by the USB forum to its members.
 * @idProduct: Vendor-assigned product ID.
 * @bcdDevice_lo: Low end of range of vendor-assigned product version numbers.
 *	This is also used to identify individual product versions, for
 *	a range consisting of a single device.
 * @bcdDevice_hi: High end of version number range.  The range of product
 *	versions is inclusive.
 * @bDeviceClass: Class of device; numbers are assigned
 *	by the USB forum.  Products may choose to implement classes,
 *	or be vendor-specific.  Device classes specify behavior of all
 *	the interfaces on a devices.
 * @bDeviceSubClass: Subclass of device; associated with bDeviceClass.
 * @bDeviceProtocol: Protocol of device; associated with bDeviceClass.
 * @bInterfaceClass: Class of interface; numbers are assigned
 *	by the USB forum.  Products may choose to implement classes,
 *	or be vendor-specific.  Interface classes specify behavior only
 *	of a given interface; other interfaces may support other classes.
 * @bInterfaceSubClass: Subclass of interface; associated with bInterfaceClass.
 * @bInterfaceProtocol: Protocol of interface; associated with bInterfaceClass.
 * @driver_info: Holds information used by the driver.  Usually it holds
 *	a pointer to a descriptor understood by the driver, or perhaps
 *	device flags.
 *
 * In most cases, drivers will create a table of device IDs by using
 * USB_DEVICE(), or similar macros designed for that purpose.
 * They will then export it to userspace using MODULE_DEVICE_TABLE(),
 * and provide it to the USB core through their usb_driver structure.
 *
 * See the usb_match_id() function for information about how matches are
 * performed.  Briefly, you will normally use one of several macros to help
 * construct these entries.  Each entry you provide will either identify
 * one or more specific products, or will identify a class of products
 * which have agreed to behave the same.  You should put the more specific
 * matches towards the beginning of your table, so that driver_info can
 * record quirks of specific products.
 */
struct usb_device_id {
	/* which fields to match against? */
	__u16		match_flags;

	/* Used for product specific matches; range is inclusive */
	__u16		idVendor;
	__u16		idProduct;
	__u16		bcdDevice_lo;
	__u16		bcdDevice_hi;

	/* Used for device class matches */
	__u8		bDeviceClass;
	__u8		bDeviceSubClass;
	__u8		bDeviceProtocol;

	/* Used for interface class matches */
	__u8		bInterfaceClass;
	__u8		bInterfaceSubClass;
	__u8		bInterfaceProtocol;

	void *driver_info;
};

#define USB_DEVICE_ID_MATCH_PRODUCT         0x0002
#define USB_DEVICE_ID_MATCH_VENDOR          0x0001
#define USB_DEVICE_ID_MATCH_DEVICE \
		(USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)

/**
 * USB_DEVICE - macro used to describe a specific usb device
 * @vend: the 16 bit USB Vendor ID
 * @prod: the 16 bit USB Product ID
 *
 * This macro is used to create a struct usb_device_id that matches a
 * specific device.
 */
#define USB_DEVICE(vend,prod) \
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE, \
	.idVendor = (vend), \
	.idProduct = (prod)

#define USB_CTRL_SET_TIMEOUT   5000
#define USB_CTRL_GET_TIMEOUT   5000

#endif /* DOXYGEN_SHOULD_SKIP_THIS */

#endif /*_USB_H_ */