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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.  Linux has several APIs in C
 * that need these:
 *
 * - the master/host side Linux-USB kernel driver API;
 * - the "usbfs" user space API; and
 * - (eventually) a Linux "gadget" slave/device 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 will benefit from working well together.
 */


#ifndef __LINUX_USB_CH9_H
#define __LINUX_USB_CH9_H

#include <asm/types.h>          /* __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

/*
 * 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


/**
 * 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;
        __u16 wValue;
        __u16 wIndex;
        __u16 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

/* 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;

        __u16 bcdUSB;
        __u8  bDeviceClass;
        __u8  bDeviceSubClass;
        __u8  bDeviceProtocol;
        __u8  bMaxPacketSize0;
        __u16 idVendor;
        __u16 idProduct;
        __u16 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_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;

        __u16 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 */

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

/* USB_DT_STRING: String descriptor */
struct usb_string_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;

        __u16 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;
        __u16 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


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

/* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
struct usb_qualifier_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;

        __u16 bcdUSB;
        __u8  bDeviceClass;
        __u8  bDeviceSubClass;
        __u8  bDeviceProtocol;
        __u8  bMaxPacketSize0;
        __u8  bNumConfigurations;
        __u8  bRESERVED;
} __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 */
};

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,

        /* the chapter 9 device states */
        USB_STATE_ATTACHED,
        USB_STATE_POWERED,
        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 */