m32r: switch to generic sys_execve()

[mirror_ubuntu-bionic-kernel.git] / include / linux / usb / ch9.h

/*
 * 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 <linux/types.h>        /* __u8 etc */
#include <asm/byteorder.h>      /* le16_to_cpu */

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

/* 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_SEL                 0x30
#define USB_REQ_SET_ISOCH_DELAY         0x31

#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

/* The Link Power Management (LPM) ECN defines USB_REQ_TEST_AND_SET command,
 * used by hubs to put ports into a new L1 suspend state, except that it
 * forgot to define its number ...
 */

/*
 * 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.)  Hubs may also support a
 * new USB_REQ_TEST_AND_SET_FEATURE to put ports into L1 suspend.
 */
#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) */

/*
 * Test Mode Selectors
 * See USB 2.0 spec Table 9-7
 */
#define TEST_J          1
#define TEST_K          2
#define TEST_SE0_NAK    3
#define TEST_PACKET     4
#define TEST_FORCE_EN   5

/*
 * New Feature Selectors as added by USB 3.0
 * See USB 3.0 spec Table 9-6
 */
#define USB_DEVICE_U1_ENABLE    48      /* dev may initiate U1 transition */
#define USB_DEVICE_U2_ENABLE    49      /* dev may initiate U2 transition */
#define USB_DEVICE_LTM_ENABLE   50      /* dev may send LTM */
#define USB_INTRF_FUNC_SUSPEND  0       /* function suspend */

#define USB_INTR_FUNC_SUSPEND_OPT_MASK  0xFF00
/*
 * Suspend Options, Table 9-7 USB 3.0 spec
 */
#define USB_INTRF_FUNC_SUSPEND_LP       (1 << (8 + 0))
#define USB_INTRF_FUNC_SUSPEND_RW       (1 << (8 + 1))

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

/* Bit array elements as returned by the USB_REQ_GET_STATUS request. */
#define USB_DEV_STAT_U1_ENABLED         2       /* transition into U1 state */
#define USB_DEV_STAT_U2_ENABLED         3       /* transition into U2 state */
#define USB_DEV_STAT_LTM_ENABLED        4       /* Latency tolerance messages */

/**
 * 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".  Within the kernel and when exposed
 * through the Linux-USB APIs, they are not converted to cpu byte
 * order; it is the responsibility of the client code to do this.
 * The single exception is when device and configuration descriptors (but
 * not other descriptors) are read from usbfs (i.e. /proc/bus/usb/BBB/DDD);
 * in this case the fields are converted to host endianness by the kernel.
 */

/*
 * 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
#define USB_DT_CS_RADIO_CONTROL         0x23
/* From the T10 UAS specification */
#define USB_DT_PIPE_USAGE               0x24
/* From the USB 3.0 spec */
#define USB_DT_SS_ENDPOINT_COMP         0x30

/* Conventional codes for class-specific descriptors.  The convention is
 * defined in the USB "Common Class" Spec (3.11).  Individual class specs
 * are authoritative for their usage, not the "common class" writeup.
 */
#define USB_DT_CS_DEVICE                (USB_TYPE_CLASS | USB_DT_DEVICE)
#define USB_DT_CS_CONFIG                (USB_TYPE_CLASS | USB_DT_CONFIG)
#define USB_DT_CS_STRING                (USB_TYPE_CLASS | USB_DT_STRING)
#define USB_DT_CS_INTERFACE             (USB_TYPE_CLASS | USB_DT_INTERFACE)
#define USB_DT_CS_ENDPOINT              (USB_TYPE_CLASS | USB_DT_ENDPOINT)

/* 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

#define USB_SUBCLASS_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

/* The USB 3.0 spec redefines bits 5:4 of bmAttributes as interrupt ep type. */
#define USB_ENDPOINT_INTRTYPE           0x30
#define USB_ENDPOINT_INTR_PERIODIC      (0 << 4)
#define USB_ENDPOINT_INTR_NOTIFICATION  (1 << 4)

#define USB_ENDPOINT_SYNCTYPE           0x0c
#define USB_ENDPOINT_SYNC_NONE          (0 << 2)
#define USB_ENDPOINT_SYNC_ASYNC         (1 << 2)
#define USB_ENDPOINT_SYNC_ADAPTIVE      (2 << 2)
#define USB_ENDPOINT_SYNC_SYNC          (3 << 2)

#define USB_ENDPOINT_USAGE_MASK         0x30
#define USB_ENDPOINT_USAGE_DATA         0x00
#define USB_ENDPOINT_USAGE_FEEDBACK     0x10
#define USB_ENDPOINT_USAGE_IMPLICIT_FB  0x20    /* Implicit feedback Data endpoint */

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

/**
 * usb_endpoint_num - get the endpoint's number
 * @epd: endpoint to be checked
 *
 * Returns @epd's number: 0 to 15.
 */
static inline int usb_endpoint_num(const struct usb_endpoint_descriptor *epd)
{
        return epd->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
}

/**
 * usb_endpoint_type - get the endpoint's transfer type
 * @epd: endpoint to be checked
 *
 * Returns one of USB_ENDPOINT_XFER_{CONTROL, ISOC, BULK, INT} according
 * to @epd's transfer type.
 */
static inline int usb_endpoint_type(const struct usb_endpoint_descriptor *epd)
{
        return epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
}

/**
 * usb_endpoint_dir_in - check if the endpoint has IN direction
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint is of type IN, otherwise it returns false.
 */
static inline int usb_endpoint_dir_in(const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN);
}

/**
 * usb_endpoint_dir_out - check if the endpoint has OUT direction
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint is of type OUT, otherwise it returns false.
 */
static inline int usb_endpoint_dir_out(
                                const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT);
}

/**
 * usb_endpoint_xfer_bulk - check if the endpoint has bulk transfer type
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint is of type bulk, otherwise it returns false.
 */
static inline int usb_endpoint_xfer_bulk(
                                const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_BULK);
}

/**
 * usb_endpoint_xfer_control - check if the endpoint has control transfer type
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint is of type control, otherwise it returns false.
 */
static inline int usb_endpoint_xfer_control(
                                const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_CONTROL);
}

/**
 * usb_endpoint_xfer_int - check if the endpoint has interrupt transfer type
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint is of type interrupt, otherwise it returns
 * false.
 */
static inline int usb_endpoint_xfer_int(
                                const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_INT);
}

/**
 * usb_endpoint_xfer_isoc - check if the endpoint has isochronous transfer type
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint is of type isochronous, otherwise it returns
 * false.
 */
static inline int usb_endpoint_xfer_isoc(
                                const struct usb_endpoint_descriptor *epd)
{
        return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
                USB_ENDPOINT_XFER_ISOC);
}

/**
 * usb_endpoint_is_bulk_in - check if the endpoint is bulk IN
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint has bulk transfer type and IN direction,
 * otherwise it returns false.
 */
static inline int usb_endpoint_is_bulk_in(
                                const struct usb_endpoint_descriptor *epd)
{
        return usb_endpoint_xfer_bulk(epd) && usb_endpoint_dir_in(epd);
}

/**
 * usb_endpoint_is_bulk_out - check if the endpoint is bulk OUT
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint has bulk transfer type and OUT direction,
 * otherwise it returns false.
 */
static inline int usb_endpoint_is_bulk_out(
                                const struct usb_endpoint_descriptor *epd)
{
        return usb_endpoint_xfer_bulk(epd) && usb_endpoint_dir_out(epd);
}

/**
 * usb_endpoint_is_int_in - check if the endpoint is interrupt IN
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint has interrupt transfer type and IN direction,
 * otherwise it returns false.
 */
static inline int usb_endpoint_is_int_in(
                                const struct usb_endpoint_descriptor *epd)
{
        return usb_endpoint_xfer_int(epd) && usb_endpoint_dir_in(epd);
}

/**
 * usb_endpoint_is_int_out - check if the endpoint is interrupt OUT
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint has interrupt transfer type and OUT direction,
 * otherwise it returns false.
 */
static inline int usb_endpoint_is_int_out(
                                const struct usb_endpoint_descriptor *epd)
{
        return usb_endpoint_xfer_int(epd) && usb_endpoint_dir_out(epd);
}

/**
 * usb_endpoint_is_isoc_in - check if the endpoint is isochronous IN
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint has isochronous transfer type and IN direction,
 * otherwise it returns false.
 */
static inline int usb_endpoint_is_isoc_in(
                                const struct usb_endpoint_descriptor *epd)
{
        return usb_endpoint_xfer_isoc(epd) && usb_endpoint_dir_in(epd);
}

/**
 * usb_endpoint_is_isoc_out - check if the endpoint is isochronous OUT
 * @epd: endpoint to be checked
 *
 * Returns true if the endpoint has isochronous transfer type and OUT direction,
 * otherwise it returns false.
 */
static inline int usb_endpoint_is_isoc_out(
                                const struct usb_endpoint_descriptor *epd)
{
        return usb_endpoint_xfer_isoc(epd) && usb_endpoint_dir_out(epd);
}

/**
 * usb_endpoint_maxp - get endpoint's max packet size
 * @epd: endpoint to be checked
 *
 * Returns @epd's max packet
 */
static inline int usb_endpoint_maxp(const struct usb_endpoint_descriptor *epd)
{
        return __le16_to_cpu(epd->wMaxPacketSize);
}

static inline int usb_endpoint_interrupt_type(
                const struct usb_endpoint_descriptor *epd)
{
        return epd->bmAttributes & USB_ENDPOINT_INTRTYPE;
}

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

/* USB_DT_SS_ENDPOINT_COMP: SuperSpeed Endpoint Companion descriptor */
struct usb_ss_ep_comp_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;

        __u8  bMaxBurst;
        __u8  bmAttributes;
        __le16 wBytesPerInterval;
} __attribute__ ((packed));

#define USB_DT_SS_EP_COMP_SIZE          6

/* Bits 4:0 of bmAttributes if this is a bulk endpoint */
static inline int
usb_ss_max_streams(const struct usb_ss_ep_comp_descriptor *comp)
{
        int             max_streams;

        if (!comp)
                return 0;

        max_streams = comp->bmAttributes & 0x1f;

        if (!max_streams)
                return 0;

        max_streams = 1 << max_streams;

        return max_streams;
}

/* Bits 1:0 of bmAttributes if this is an isoc endpoint */
#define USB_SS_MULT(p)                  (1 + ((p) & 0x3))

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

/* 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 device-level capabilities */
struct usb_bos_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;

        __le16 wTotalLength;
        __u8  bNumDeviceCaps;
} __attribute__((packed));

#define USB_DT_BOS_SIZE         5
/*-------------------------------------------------------------------------*/

/* 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 2.0 Extension descriptor */
#define USB_CAP_TYPE_EXT                2

struct usb_ext_cap_descriptor {         /* Link Power Management */
        __u8  bLength;
        __u8  bDescriptorType;
        __u8  bDevCapabilityType;
        __le32 bmAttributes;
#define USB_LPM_SUPPORT                 (1 << 1)        /* supports LPM */
#define USB_BESL_SUPPORT                (1 << 2)        /* supports BESL */
#define USB_BESL_BASELINE_VALID         (1 << 3)        /* Baseline BESL valid*/
#define USB_BESL_DEEP_VALID             (1 << 4)        /* Deep BESL valid */
#define USB_GET_BESL_BASELINE(p)        (((p) & (0xf << 8)) >> 8)
#define USB_GET_BESL_DEEP(p)            (((p) & (0xf << 12)) >> 12)
} __attribute__((packed));

#define USB_DT_USB_EXT_CAP_SIZE 7

/*
 * SuperSpeed USB Capability descriptor: Defines the set of SuperSpeed USB
 * specific device level capabilities
 */
#define         USB_SS_CAP_TYPE         3
struct usb_ss_cap_descriptor {          /* Link Power Management */
        __u8  bLength;
        __u8  bDescriptorType;
        __u8  bDevCapabilityType;
        __u8  bmAttributes;
#define USB_LTM_SUPPORT                 (1 << 1) /* supports LTM */
        __le16 wSpeedSupported;
#define USB_LOW_SPEED_OPERATION         (1)      /* Low speed operation */
#define USB_FULL_SPEED_OPERATION        (1 << 1) /* Full speed operation */
#define USB_HIGH_SPEED_OPERATION        (1 << 2) /* High speed operation */
#define USB_5GBPS_OPERATION             (1 << 3) /* Operation at 5Gbps */
        __u8  bFunctionalitySupport;
        __u8  bU1devExitLat;
        __le16 bU2DevExitLat;
} __attribute__((packed));

#define USB_DT_USB_SS_CAP_SIZE  10

/*
 * Container ID Capability descriptor: Defines the instance unique ID used to
 * identify the instance across all operating modes
 */
#define CONTAINER_ID_TYPE       4
struct usb_ss_container_id_descriptor {
        __u8  bLength;
        __u8  bDescriptorType;
        __u8  bDevCapabilityType;
        __u8  bReserved;
        __u8  ContainerID[16]; /* 128-bit number */
} __attribute__((packed));

#define USB_DT_USB_SS_CONTN_ID_SIZE     20
/*-------------------------------------------------------------------------*/

/* 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_WIRELESS,                     /* wireless (usb 2.5) */
        USB_SPEED_SUPER,                        /* usb 3.0 */
};

#ifdef __KERNEL__

/**
 * usb_speed_string() - Returns human readable-name of the speed.
 * @speed: The speed to return human-readable name for.  If it's not
 *   any of the speeds defined in usb_device_speed enum, string for
 *   USB_SPEED_UNKNOWN will be returned.
 */
extern const char *usb_speed_string(enum usb_device_speed speed);

#endif

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_RECONNECTING,                 /* auth */
        USB_STATE_UNAUTHENTICATED,              /* 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.
         * At this level there's no difference between L1 and L2
         * suspend states.  (L2 being original USB 1.1 suspend.)
         */
};

enum usb3_link_state {
        USB3_LPM_U0 = 0,
        USB3_LPM_U1,
        USB3_LPM_U2,
        USB3_LPM_U3
};

/*
 * A U1 timeout of 0x0 means the parent hub will reject any transitions to U1.
 * 0xff means the parent hub will accept transitions to U1, but will not
 * initiate a transition.
 *
 * A U1 timeout of 0x1 to 0x7F also causes the hub to initiate a transition to
 * U1 after that many microseconds.  Timeouts of 0x80 to 0xFE are reserved
 * values.
 *
 * A U2 timeout of 0x0 means the parent hub will reject any transitions to U2.
 * 0xff means the parent hub will accept transitions to U2, but will not
 * initiate a transition.
 *
 * A U2 timeout of 0x1 to 0xFE also causes the hub to initiate a transition to
 * U2 after N*256 microseconds.  Therefore a U2 timeout value of 0x1 means a U2
 * idle timer of 256 microseconds, 0x2 means 512 microseconds, 0xFE means
 * 65.024ms.
 */
#define USB3_LPM_DISABLED               0x0
#define USB3_LPM_U1_MAX_TIMEOUT         0x7F
#define USB3_LPM_U2_MAX_TIMEOUT         0xFE
#define USB3_LPM_DEVICE_INITIATED       0xFF

struct usb_set_sel_req {
        __u8    u1_sel;
        __u8    u1_pel;
        __le16  u2_sel;
        __le16  u2_pel;
} __attribute__ ((packed));

/*
 * The Set System Exit Latency control transfer provides one byte each for
 * U1 SEL and U1 PEL, so the max exit latency is 0xFF.  U2 SEL and U2 PEL each
 * are two bytes long.
 */
#define USB3_LPM_MAX_U1_SEL_PEL         0xFF
#define USB3_LPM_MAX_U2_SEL_PEL         0xFFFF

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

/*
 * As per USB compliance update, a device that is actively drawing
 * more than 100mA from USB must report itself as bus-powered in
 * the GetStatus(DEVICE) call.
 * http://compliance.usb.org/index.asp?UpdateFile=Electrical&Format=Standard#34
 */
#define USB_SELF_POWER_VBUS_MAX_DRAW            100

#endif /* __LINUX_USB_CH9_H */