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/*

 * This file holds USB constants and structures that are needed for

 * USB device APIs.  These are used by the USB device model, which is

 * defined in chapter 9 of the USB 2.0 specification and in the

 * Wireless USB 1.0 (spread around).  Linux has several APIs in C that

 * need these:

 *

 * - the master/host side Linux-USB kernel driver API;

 * - the "usbfs" user space API; and

 * - the Linux "gadget" slave/device/peripheral side driver API.

 *

 * USB 2.0 adds an additional "On The Go" (OTG) mode, which lets systems

 * act either as a USB master/host or as a USB slave/device.  That means

 * the master and slave side APIs benefit from working well together.

 *

 * There's also "Wireless USB", using low power short range radios for

 * peripheral interconnection but otherwise building on the USB framework.

 *

 * Note all descriptors are declared '__attribute__((packed))' so that:

 *

 * [a] they never get padded, either internally (USB spec writers

 *     probably handled that) or externally;

 *

 * [b] so that accessing bigger-than-a-bytes fields will never

 *     generate bus errors on any platform, even when the location of

 *     its descriptor inside a bundle isn't "naturally aligned", and

 *

 * [c] for consistency, removing all doubt even when it appears to

 *     someone that the two other points are non-issues for that

 *     particular descriptor type.

 */

#ifndef __LINUX_USB_CH9_H

#define __LINUX_USB_CH9_H

#include 	/* __u8 etc */

/*-------------------------------------------------------------------------*/

/* CONTROL REQUEST SUPPORT */

/*

 * USB directions

 *

 * This bit flag is used in endpoint descriptors' bEndpointAddress field.

 * It's also one of three fields in control requests bRequestType.

 */

#define USB_DIR_OUT			0		/* to device */

#define USB_DIR_IN			0x80		/* to host */

/*

 * USB types, the second of three bRequestType fields

 */

#define USB_TYPE_MASK			(0x03 << 5)

#define USB_TYPE_STANDARD		(0x00 << 5)

#define USB_TYPE_CLASS			(0x01 << 5)

#define USB_TYPE_VENDOR			(0x02 << 5)

#define USB_TYPE_RESERVED		(0x03 << 5)

/*

 * USB recipients, the third of three bRequestType fields

 */

#define USB_RECIP_MASK			0x1f

#define USB_RECIP_DEVICE		0x00

#define USB_RECIP_INTERFACE		0x01

#define USB_RECIP_ENDPOINT		0x02

#define USB_RECIP_OTHER			0x03

/* From Wireless USB 1.0 */

#define USB_RECIP_PORT 			0x04

#define USB_RECIP_RPIPE 		0x05

/*

 * Standard requests, for the bRequest field of a SETUP packet.

 *

 * These are qualified by the bRequestType field, so that for example

 * TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved

 * by a GET_STATUS request.

 */

#define USB_REQ_GET_STATUS		0x00

#define USB_REQ_CLEAR_FEATURE		0x01

#define USB_REQ_SET_FEATURE		0x03

#define USB_REQ_SET_ADDRESS		0x05

#define USB_REQ_GET_DESCRIPTOR		0x06

#define USB_REQ_SET_DESCRIPTOR		0x07

#define USB_REQ_GET_CONFIGURATION	0x08

#define USB_REQ_SET_CONFIGURATION	0x09

#define USB_REQ_GET_INTERFACE		0x0A

#define USB_REQ_SET_INTERFACE		0x0B

#define USB_REQ_SYNCH_FRAME		0x0C

#define USB_REQ_SET_ENCRYPTION		0x0D	/* Wireless USB */

#define USB_REQ_GET_ENCRYPTION		0x0E

#define USB_REQ_RPIPE_ABORT		0x0E

#define USB_REQ_SET_HANDSHAKE		0x0F

#define USB_REQ_RPIPE_RESET		0x0F

#define USB_REQ_GET_HANDSHAKE		0x10

#define USB_REQ_SET_CONNECTION		0x11

#define USB_REQ_SET_SECURITY_DATA	0x12

#define USB_REQ_GET_SECURITY_DATA	0x13

#define USB_REQ_SET_WUSB_DATA		0x14

#define USB_REQ_LOOPBACK_DATA_WRITE	0x15

#define USB_REQ_LOOPBACK_DATA_READ	0x16

#define USB_REQ_SET_INTERFACE_DS	0x17

/*

 * USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and

 * are read as a bit array returned by USB_REQ_GET_STATUS.  (So there

 * are at most sixteen features of each type.)

 */

#define USB_DEVICE_SELF_POWERED		0	/* (read only) */

#define USB_DEVICE_REMOTE_WAKEUP	1	/* dev may initiate wakeup */

#define USB_DEVICE_TEST_MODE		2	/* (wired high speed only) */

#define USB_DEVICE_BATTERY		2	/* (wireless) */

#define USB_DEVICE_B_HNP_ENABLE		3	/* (otg) dev may initiate HNP */

#define USB_DEVICE_WUSB_DEVICE		3	/* (wireless)*/

#define USB_DEVICE_A_HNP_SUPPORT	4	/* (otg) RH port supports HNP */

#define USB_DEVICE_A_ALT_HNP_SUPPORT	5	/* (otg) other RH port does */

#define USB_DEVICE_DEBUG_MODE		6	/* (special devices only) */

#define USB_ENDPOINT_HALT		0	/* IN/OUT will STALL */

/**

 * struct usb_ctrlrequest - SETUP data for a USB device control request

 * @bRequestType: matches the USB bmRequestType field

 * @bRequest: matches the USB bRequest field

 * @wValue: matches the USB wValue field (le16 byte order)

 * @wIndex: matches the USB wIndex field (le16 byte order)

 * @wLength: matches the USB wLength field (le16 byte order)

 *

 * This structure is used to send control requests to a USB device.  It matches

 * the different fields of the USB 2.0 Spec section 9.3, table 9-2.  See the

 * USB spec for a fuller description of the different fields, and what they are

 * used for.

 *

 * Note that the driver for any interface can issue control requests.

 * For most devices, interfaces don't coordinate with each other, so

 * such requests may be made at any time.

 */

struct usb_ctrlrequest {

	__u8 bRequestType;

	__u8 bRequest;

	__le16 wValue;

	__le16 wIndex;

	__le16 wLength;

} __attribute__ ((packed));

/*-------------------------------------------------------------------------*/

/*

 * STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or

 * (rarely) accepted by SET_DESCRIPTOR.

 *

 * Note that all multi-byte values here are encoded in little endian

 * byte order "on the wire".  But when exposed through Linux-USB APIs,

 * they've been converted to cpu byte order.

 */

/*

 * Descriptor types ... USB 2.0 spec table 9.5

 */

#define USB_DT_DEVICE			0x01

#define USB_DT_CONFIG			0x02

#define USB_DT_STRING			0x03

#define USB_DT_INTERFACE		0x04

#define USB_DT_ENDPOINT			0x05

#define USB_DT_DEVICE_QUALIFIER		0x06

#define USB_DT_OTHER_SPEED_CONFIG	0x07

#define USB_DT_INTERFACE_POWER		0x08

/* these are from a minor usb 2.0 revision (ECN) */

#define USB_DT_OTG			0x09

#define USB_DT_DEBUG			0x0a

#define USB_DT_INTERFACE_ASSOCIATION	0x0b

/* these are from the Wireless USB spec */

#define USB_DT_SECURITY			0x0c

#define USB_DT_KEY			0x0d

#define USB_DT_ENCRYPTION_TYPE		0x0e

#define USB_DT_BOS			0x0f

#define USB_DT_DEVICE_CAPABILITY	0x10

#define USB_DT_WIRELESS_ENDPOINT_COMP	0x11

#define USB_DT_WIRE_ADAPTER		0x21

#define USB_DT_RPIPE			0x22

/* conventional codes for class-specific descriptors */

#define USB_DT_CS_DEVICE		0x21

#define USB_DT_CS_CONFIG		0x22

#define USB_DT_CS_STRING		0x23

#define USB_DT_CS_INTERFACE		0x24

#define USB_DT_CS_ENDPOINT		0x25

/* All standard descriptors have these 2 fields at the beginning */

struct usb_descriptor_header {

	__u8  bLength;

	__u8  bDescriptorType;

} __attribute__ ((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_DEVICE: Device descriptor */

struct usb_device_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__le16 bcdUSB;

	__u8  bDeviceClass;

	__u8  bDeviceSubClass;

	__u8  bDeviceProtocol;

	__u8  bMaxPacketSize0;

	__le16 idVendor;

	__le16 idProduct;

	__le16 bcdDevice;

	__u8  iManufacturer;

	__u8  iProduct;

	__u8  iSerialNumber;

	__u8  bNumConfigurations;

} __attribute__ ((packed));

#define USB_DT_DEVICE_SIZE		18

/*

 * Device and/or Interface Class codes

 * as found in bDeviceClass or bInterfaceClass

 * and defined by www.usb.org documents

 */

#define USB_CLASS_PER_INTERFACE		0	/* for DeviceClass */

#define USB_CLASS_AUDIO			1

#define USB_CLASS_COMM			2

#define USB_CLASS_HID			3

#define USB_CLASS_PHYSICAL		5

#define USB_CLASS_STILL_IMAGE		6

#define USB_CLASS_PRINTER		7

#define USB_CLASS_MASS_STORAGE		8

#define USB_CLASS_HUB			9

#define USB_CLASS_CDC_DATA		0x0a

#define USB_CLASS_CSCID			0x0b	/* chip+ smart card */

#define USB_CLASS_CONTENT_SEC		0x0d	/* content security */

#define USB_CLASS_VIDEO			0x0e

#define USB_CLASS_WIRELESS_CONTROLLER	0xe0

#define USB_CLASS_MISC			0xef

#define USB_CLASS_APP_SPEC		0xfe

#define USB_CLASS_VENDOR_SPEC		0xff

/*-------------------------------------------------------------------------*/

/* USB_DT_CONFIG: Configuration descriptor information.

 *

 * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the

 * descriptor type is different.  Highspeed-capable devices can look

 * different depending on what speed they're currently running.  Only

 * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG

 * descriptors.

 */

struct usb_config_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__le16 wTotalLength;

	__u8  bNumInterfaces;

	__u8  bConfigurationValue;

	__u8  iConfiguration;

	__u8  bmAttributes;

	__u8  bMaxPower;

} __attribute__ ((packed));

#define USB_DT_CONFIG_SIZE		9

/* from config descriptor bmAttributes */

#define USB_CONFIG_ATT_ONE		(1 << 7)	/* must be set */

#define USB_CONFIG_ATT_SELFPOWER	(1 << 6)	/* self powered */

#define USB_CONFIG_ATT_WAKEUP		(1 << 5)	/* can wakeup */

#define USB_CONFIG_ATT_BATTERY		(1 << 4)	/* battery powered */

/*-------------------------------------------------------------------------*/

/* USB_DT_STRING: String descriptor */

struct usb_string_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__le16 wData[1];		/* UTF-16LE encoded */

} __attribute__ ((packed));

/* note that "string" zero is special, it holds language codes that

 * the device supports, not Unicode characters.

 */

/*-------------------------------------------------------------------------*/

/* USB_DT_INTERFACE: Interface descriptor */

struct usb_interface_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bInterfaceNumber;

	__u8  bAlternateSetting;

	__u8  bNumEndpoints;

	__u8  bInterfaceClass;

	__u8  bInterfaceSubClass;

	__u8  bInterfaceProtocol;

	__u8  iInterface;

} __attribute__ ((packed));

#define USB_DT_INTERFACE_SIZE		9

/*-------------------------------------------------------------------------*/

/* USB_DT_ENDPOINT: Endpoint descriptor */

struct usb_endpoint_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bEndpointAddress;

	__u8  bmAttributes;

	__le16 wMaxPacketSize;

	__u8  bInterval;

	/* NOTE:  these two are _only_ in audio endpoints. */

	/* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */

	__u8  bRefresh;

	__u8  bSynchAddress;

} __attribute__ ((packed));

#define USB_DT_ENDPOINT_SIZE		7

#define USB_DT_ENDPOINT_AUDIO_SIZE	9	/* Audio extension */

/*

 * Endpoints

 */

#define USB_ENDPOINT_NUMBER_MASK	0x0f	/* in bEndpointAddress */

#define USB_ENDPOINT_DIR_MASK		0x80

#define USB_ENDPOINT_XFERTYPE_MASK	0x03	/* in bmAttributes */

#define USB_ENDPOINT_XFER_CONTROL	0

#define USB_ENDPOINT_XFER_ISOC		1

#define USB_ENDPOINT_XFER_BULK		2

#define USB_ENDPOINT_XFER_INT		3

#define USB_ENDPOINT_MAX_ADJUSTABLE	0x80

/*-------------------------------------------------------------------------*/

/* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */

struct usb_qualifier_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__le16 bcdUSB;

	__u8  bDeviceClass;

	__u8  bDeviceSubClass;

	__u8  bDeviceProtocol;

	__u8  bMaxPacketSize0;

	__u8  bNumConfigurations;

	__u8  bRESERVED;

} __attribute__ ((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_OTG (from OTG 1.0a supplement) */

struct usb_otg_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bmAttributes;	/* support for HNP, SRP, etc */

} __attribute__ ((packed));

/* from usb_otg_descriptor.bmAttributes */

#define USB_OTG_SRP		(1 << 0)

#define USB_OTG_HNP		(1 << 1)	/* swap host/device roles */

/*-------------------------------------------------------------------------*/

/* USB_DT_DEBUG:  for special highspeed devices, replacing serial console */

struct usb_debug_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	/* bulk endpoints with 8 byte maxpacket */

	__u8  bDebugInEndpoint;

	__u8  bDebugOutEndpoint;

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */

struct usb_interface_assoc_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bFirstInterface;

	__u8  bInterfaceCount;

	__u8  bFunctionClass;

	__u8  bFunctionSubClass;

	__u8  bFunctionProtocol;

	__u8  iFunction;

} __attribute__ ((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_SECURITY:  group of wireless security descriptors, including

 * encryption types available for setting up a CC/association.

 */

struct usb_security_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__le16 wTotalLength;

	__u8  bNumEncryptionTypes;

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_KEY:  used with {GET,SET}_SECURITY_DATA; only public keys

 * may be retrieved.

 */

struct usb_key_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  tTKID[3];

	__u8  bReserved;

	__u8  bKeyData[0];

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_ENCRYPTION_TYPE:  bundled in DT_SECURITY groups */

struct usb_encryption_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bEncryptionType;

#define	USB_ENC_TYPE_UNSECURE		0

#define	USB_ENC_TYPE_WIRED		1	/* non-wireless mode */

#define	USB_ENC_TYPE_CCM_1		2	/* aes128/cbc session */

#define	USB_ENC_TYPE_RSA_1		3	/* rsa3072/sha1 auth */

	__u8  bEncryptionValue;		/* use in SET_ENCRYPTION */

	__u8  bAuthKeyIndex;

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_BOS:  group of wireless capabilities */

struct usb_bos_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__le16 wTotalLength;

	__u8  bNumDeviceCaps;

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_DEVICE_CAPABILITY:  grouped with BOS */

struct usb_dev_cap_header {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bDevCapabilityType;

} __attribute__((packed));

#define	USB_CAP_TYPE_WIRELESS_USB	1

struct usb_wireless_cap_descriptor {	/* Ultra Wide Band */

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bDevCapabilityType;

	__u8  bmAttributes;

#define	USB_WIRELESS_P2P_DRD		(1 << 1)

#define	USB_WIRELESS_BEACON_MASK	(3 << 2)

#define	USB_WIRELESS_BEACON_SELF	(1 << 2)

#define	USB_WIRELESS_BEACON_DIRECTED	(2 << 2)

#define	USB_WIRELESS_BEACON_NONE	(3 << 2)

	__le16 wPHYRates;	/* bit rates, Mbps */

#define	USB_WIRELESS_PHY_53		(1 << 0)	/* always set */

#define	USB_WIRELESS_PHY_80		(1 << 1)

#define	USB_WIRELESS_PHY_107		(1 << 2)	/* always set */

#define	USB_WIRELESS_PHY_160		(1 << 3)

#define	USB_WIRELESS_PHY_200		(1 << 4)	/* always set */

#define	USB_WIRELESS_PHY_320		(1 << 5)

#define	USB_WIRELESS_PHY_400		(1 << 6)

#define	USB_WIRELESS_PHY_480		(1 << 7)

	__u8  bmTFITXPowerInfo;	/* TFI power levels */

	__u8  bmFFITXPowerInfo;	/* FFI power levels */

	__le16 bmBandGroup;

	__u8  bReserved;

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_DT_WIRELESS_ENDPOINT_COMP:  companion descriptor associated with

 * each endpoint descriptor for a wireless device

 */

struct usb_wireless_ep_comp_descriptor {

	__u8  bLength;

	__u8  bDescriptorType;

	__u8  bMaxBurst;

	__u8  bMaxSequence;

	__le16 wMaxStreamDelay;

	__le16 wOverTheAirPacketSize;

	__u8  bOverTheAirInterval;

	__u8  bmCompAttributes;

#define USB_ENDPOINT_SWITCH_MASK	0x03	/* in bmCompAttributes */

#define USB_ENDPOINT_SWITCH_NO		0

#define USB_ENDPOINT_SWITCH_SWITCH	1

#define USB_ENDPOINT_SWITCH_SCALE	2

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless

 * host and a device for connection set up, mutual authentication, and

 * exchanging short lived session keys.  The handshake depends on a CC.

 */

struct usb_handshake {

	__u8 bMessageNumber;

	__u8 bStatus;

	__u8 tTKID[3];

	__u8 bReserved;

	__u8 CDID[16];

	__u8 nonce[16];

	__u8 MIC[8];

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).

 * A CC may also be set up using non-wireless secure channels (including

 * wired USB!), and some devices may support CCs with multiple hosts.

 */

struct usb_connection_context {

	__u8 CHID[16];		/* persistent host id */

	__u8 CDID[16];		/* device id (unique w/in host context) */

	__u8 CK[16];		/* connection key */

} __attribute__((packed));

/*-------------------------------------------------------------------------*/

/* USB 2.0 defines three speeds, here's how Linux identifies them */

enum usb_device_speed {

	USB_SPEED_UNKNOWN = 0,			/* enumerating */

	USB_SPEED_LOW, USB_SPEED_FULL,		/* usb 1.1 */

	USB_SPEED_HIGH,				/* usb 2.0 */

	USB_SPEED_VARIABLE,			/* wireless (usb 2.5) */

};

enum usb_device_state {

	/* NOTATTACHED isn't in the USB spec, and this state acts

	 * the same as ATTACHED ... but it's clearer this way.

	 */

	USB_STATE_NOTATTACHED = 0,

	/* chapter 9 and authentication (wireless) device states */

	USB_STATE_ATTACHED,

	USB_STATE_POWERED,			/* wired */

	USB_STATE_UNAUTHENTICATED,		/* auth */

	USB_STATE_RECONNECTING,			/* auth */

	USB_STATE_DEFAULT,			/* limited function */

	USB_STATE_ADDRESS,

	USB_STATE_CONFIGURED,			/* most functions */

	USB_STATE_SUSPENDED

	/* NOTE:  there are actually four different SUSPENDED

	 * states, returning to POWERED, DEFAULT, ADDRESS, or

	 * CONFIGURED respectively when SOF tokens flow again.

	 */

};

#endif	/* __LINUX_USB_CH9_H */