usb_ch9.h

AMLOGIC DPF source code

/*
 * 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.  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.
 */

#ifndef __LINUX_USB_CH9_H
#define __LINUX_USB_CH9_H

#include <stdint.h>

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

/* 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

/*
 * 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_SET_HANDSHAKE		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.
 */
#define USB_SETUP_PACKET_SIZE	8

#pragma Pack(1)
typedef struct usb_ctrlrequest {
        __u8  bRequestType;
        __u8  bRequest;
        __u16 wValue;
        __u16 wIndex;
        __u16 wLength;
} usb_ctrlrequest_t;
#pragma Pack()

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

/*
 * 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

/* 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 */
typedef struct usb_descriptor_header {
        __u8  bLength;
        __u8  bDescriptorType;
} usb_descriptor_header_t;


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

/* USB_DT_DEVICE: Device descriptor */
typedef struct usb_device_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;
        __u16 bcdUSB;
        __u8  bDeviceClass;
        __u8  bDeviceSubClass;
        __u8  bDeviceProtocol;
        __u8  bMaxPacketSize0;
        __u16 idVendor;
        __u16 idProduct;
        __u16 bcdDevice;
        __u8  iManufacturer;
        __u8  iProduct;
        __u8  iSerialNumber;
        __u8  bNumConfigurations;
} usb_device_descriptor_t;

#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_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.
 */
typedef struct usb_config_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;
        __u16 wTotalLength;
        __u8  bNumInterfaces;
        __u8  bConfigurationValue;
        __u8  iConfiguration;
        __u8  bmAttributes;
        __u8  bMaxPower;

        struct usb_interface *interface;

        unsigned char *extra;   /* Extra descriptors */
        int extralen;
} usb_config_descriptor_t;

#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 */
typedef struct usb_string_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;

        __u16 wData[1]; /* UTF-16LE encoded */
} usb_string_descriptor_t;

/* note that "string" zero is special, it holds language codes that
 * the device supports, not Unicode characters.
 */

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

/* USB_DT_INTERFACE: Interface descriptor */
typedef struct usb_interface_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;
        __u8  bInterfaceNumber;
        __u8  bAlternateSetting;
        __u8  bNumEndpoints;
        __u8  bInterfaceClass;
        __u8  bInterfaceSubClass;
        __u8  bInterfaceProtocol;
        __u8  iInterface;

        struct usb_endpoint_descriptor *endpoint;

        unsigned char *extra;   /* Extra descriptors */