LXR linux/include/linux/usb/ch9.h

   1/*
   2 * This file holds USB constants and structures that are needed for
   3 * USB device APIs.  These are used by the USB device model, which is
   4 * defined in chapter 9 of the USB 2.0 specification and in the
   5 * Wireless USB 1.0 (spread around).  Linux has several APIs in C that
   6 * need these:
   7 *
   8 * - the master/host side Linux-USB kernel driver API;
   9 * - the "usbfs" user space API; and
  10 * - the Linux "gadget" slave/device/peripheral side driver API.
  11 *
  12 * USB 2.0 adds an additional "On The Go" (OTG) mode, which lets systems
  13 * act either as a USB master/host or as a USB slave/device.  That means
  14 * the master and slave side APIs benefit from working well together.
  15 *
  16 * There's also "Wireless USB", using low power short range radios for
  17 * peripheral interconnection but otherwise building on the USB framework.
  18 *
  19 * Note all descriptors are declared '__attribute__((packed))' so that:
  20 *
  21 * [a] they never get padded, either internally (USB spec writers
  22 *     probably handled that) or externally;
  23 *
  24 * [b] so that accessing bigger-than-a-bytes fields will never
  25 *     generate bus errors on any platform, even when the location of
  26 *     its descriptor inside a bundle isn't "naturally aligned", and
  27 *
  28 * [c] for consistency, removing all doubt even when it appears to
  29 *     someone that the two other points are non-issues for that
  30 *     particular descriptor type.
  31 */
  32
  33#ifndef __LINUX_USB_CH9_H
  34#define __LINUX_USB_CH9_H
  35
  36#include <linux/types.h>        /* __u8 etc */
  37
  38/*-------------------------------------------------------------------------*/
  39
  40/* CONTROL REQUEST SUPPORT */
  41
  42/*
  43 * USB directions
  44 *
  45 * This bit flag is used in endpoint descriptors' bEndpointAddress field.
  46 * It's also one of three fields in control requests bRequestType.
  47 */
  48#define USB_DIR_OUT                     0               /* to device */
  49#define USB_DIR_IN                      0x80            /* to host */
  50
  51/*
  52 * USB types, the second of three bRequestType fields
  53 */
  54#define USB_TYPE_MASK                   (0x03 << 5)
  55#define USB_TYPE_STANDARD               (0x00 << 5)
  56#define USB_TYPE_CLASS                  (0x01 << 5)
  57#define USB_TYPE_VENDOR                 (0x02 << 5)
  58#define USB_TYPE_RESERVED               (0x03 << 5)
  59
  60/*
  61 * USB recipients, the third of three bRequestType fields
  62 */
  63#define USB_RECIP_MASK                  0x1f
  64#define USB_RECIP_DEVICE                0x00
  65#define USB_RECIP_INTERFACE             0x01
  66#define USB_RECIP_ENDPOINT              0x02
  67#define USB_RECIP_OTHER                 0x03
  68/* From Wireless USB 1.0 */
  69#define USB_RECIP_PORT                  0x04
  70#define USB_RECIP_RPIPE         0x05
  71
  72/*
  73 * Standard requests, for the bRequest field of a SETUP packet.
  74 *
  75 * These are qualified by the bRequestType field, so that for example
  76 * TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved
  77 * by a GET_STATUS request.
  78 */
  79#define USB_REQ_GET_STATUS              0x00
  80#define USB_REQ_CLEAR_FEATURE           0x01
  81#define USB_REQ_SET_FEATURE             0x03
  82#define USB_REQ_SET_ADDRESS             0x05
  83#define USB_REQ_GET_DESCRIPTOR          0x06
  84#define USB_REQ_SET_DESCRIPTOR          0x07
  85#define USB_REQ_GET_CONFIGURATION       0x08
  86#define USB_REQ_SET_CONFIGURATION       0x09
  87#define USB_REQ_GET_INTERFACE           0x0A
  88#define USB_REQ_SET_INTERFACE           0x0B
  89#define USB_REQ_SYNCH_FRAME             0x0C
  90
  91#define USB_REQ_SET_ENCRYPTION          0x0D    /* Wireless USB */
  92#define USB_REQ_GET_ENCRYPTION          0x0E
  93#define USB_REQ_RPIPE_ABORT             0x0E
  94#define USB_REQ_SET_HANDSHAKE           0x0F
  95#define USB_REQ_RPIPE_RESET             0x0F
  96#define USB_REQ_GET_HANDSHAKE           0x10
  97#define USB_REQ_SET_CONNECTION          0x11
  98#define USB_REQ_SET_SECURITY_DATA       0x12
  99#define USB_REQ_GET_SECURITY_DATA       0x13
 100#define USB_REQ_SET_WUSB_DATA           0x14
 101#define USB_REQ_LOOPBACK_DATA_WRITE     0x15
 102#define USB_REQ_LOOPBACK_DATA_READ      0x16
 103#define USB_REQ_SET_INTERFACE_DS        0x17
 104
 105/* The Link Power Mangement (LPM) ECN defines USB_REQ_TEST_AND_SET command,
 106 * used by hubs to put ports into a new L1 suspend state, except that it
 107 * forgot to define its number ...
 108 */
 109
 110/*
 111 * USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and
 112 * are read as a bit array returned by USB_REQ_GET_STATUS.  (So there
 113 * are at most sixteen features of each type.)  Hubs may also support a
 114 * new USB_REQ_TEST_AND_SET_FEATURE to put ports into L1 suspend.
 115 */
 116#define USB_DEVICE_SELF_POWERED         0       /* (read only) */
 117#define USB_DEVICE_REMOTE_WAKEUP        1       /* dev may initiate wakeup */
 118#define USB_DEVICE_TEST_MODE            2       /* (wired high speed only) */
 119#define USB_DEVICE_BATTERY              2       /* (wireless) */
 120#define USB_DEVICE_B_HNP_ENABLE         3       /* (otg) dev may initiate HNP */
 121#define USB_DEVICE_WUSB_DEVICE          3       /* (wireless)*/
 122#define USB_DEVICE_A_HNP_SUPPORT        4       /* (otg) RH port supports HNP */
 123#define USB_DEVICE_A_ALT_HNP_SUPPORT    5       /* (otg) other RH port does */
 124#define USB_DEVICE_DEBUG_MODE           6       /* (special devices only) */
 125
 126#define USB_ENDPOINT_HALT               0       /* IN/OUT will STALL */
 127
 128
 129/**
 130 * struct usb_ctrlrequest - SETUP data for a USB device control request
 131 * @bRequestType: matches the USB bmRequestType field
 132 * @bRequest: matches the USB bRequest field
 133 * @wValue: matches the USB wValue field (le16 byte order)
 134 * @wIndex: matches the USB wIndex field (le16 byte order)
 135 * @wLength: matches the USB wLength field (le16 byte order)
 136 *
 137 * This structure is used to send control requests to a USB device.  It matches
 138 * the different fields of the USB 2.0 Spec section 9.3, table 9-2.  See the
 139 * USB spec for a fuller description of the different fields, and what they are
 140 * used for.
 141 *
 142 * Note that the driver for any interface can issue control requests.
 143 * For most devices, interfaces don't coordinate with each other, so
 144 * such requests may be made at any time.
 145 */
 146struct usb_ctrlrequest {
 147        __u8 bRequestType;
 148        __u8 bRequest;
 149        __le16 wValue;
 150        __le16 wIndex;
 151        __le16 wLength;
 152} __attribute__ ((packed));
 153
 154/*-------------------------------------------------------------------------*/
 155
 156/*
 157 * STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or
 158 * (rarely) accepted by SET_DESCRIPTOR.
 159 *
 160 * Note that all multi-byte values here are encoded in little endian
 161 * byte order "on the wire".  Within the kernel and when exposed
 162 * through the Linux-USB APIs, they are not converted to cpu byte
 163 * order; it is the responsibility of the client code to do this.
 164 * The single exception is when device and configuration descriptors (but
 165 * not other descriptors) are read from usbfs (i.e. /proc/bus/usb/BBB/DDD);
 166 * in this case the fields are converted to host endianness by the kernel.
 167 */
 168
 169/*
 170 * Descriptor types ... USB 2.0 spec table 9.5
 171 */
 172#define USB_DT_DEVICE                   0x01
 173#define USB_DT_CONFIG                   0x02
 174#define USB_DT_STRING                   0x03
 175#define USB_DT_INTERFACE                0x04
 176#define USB_DT_ENDPOINT                 0x05
 177#define USB_DT_DEVICE_QUALIFIER         0x06
 178#define USB_DT_OTHER_SPEED_CONFIG       0x07
 179#define USB_DT_INTERFACE_POWER          0x08
 180/* these are from a minor usb 2.0 revision (ECN) */
 181#define USB_DT_OTG                      0x09
 182#define USB_DT_DEBUG                    0x0a
 183#define USB_DT_INTERFACE_ASSOCIATION    0x0b
 184/* these are from the Wireless USB spec */
 185#define USB_DT_SECURITY                 0x0c
 186#define USB_DT_KEY                      0x0d
 187#define USB_DT_ENCRYPTION_TYPE          0x0e
 188#define USB_DT_BOS                      0x0f
 189#define USB_DT_DEVICE_CAPABILITY        0x10
 190#define USB_DT_WIRELESS_ENDPOINT_COMP   0x11
 191#define USB_DT_WIRE_ADAPTER             0x21
 192#define USB_DT_RPIPE                    0x22
 193#define USB_DT_CS_RADIO_CONTROL         0x23
 194
 195/* Conventional codes for class-specific descriptors.  The convention is
 196 * defined in the USB "Common Class" Spec (3.11).  Individual class specs
 197 * are authoritative for their usage, not the "common class" writeup.
 198 */
 199#define USB_DT_CS_DEVICE                (USB_TYPE_CLASS | USB_DT_DEVICE)
 200#define USB_DT_CS_CONFIG                (USB_TYPE_CLASS | USB_DT_CONFIG)
 201#define USB_DT_CS_STRING                (USB_TYPE_CLASS | USB_DT_STRING)
 202#define USB_DT_CS_INTERFACE             (USB_TYPE_CLASS | USB_DT_INTERFACE)
 203#define USB_DT_CS_ENDPOINT              (USB_TYPE_CLASS | USB_DT_ENDPOINT)
 204
 205/* All standard descriptors have these 2 fields at the beginning */
 206struct usb_descriptor_header {
 207        __u8  bLength;
 208        __u8  bDescriptorType;
 209} __attribute__ ((packed));
 210
 211
 212/*-------------------------------------------------------------------------*/
 213
 214/* USB_DT_DEVICE: Device descriptor */
 215struct usb_device_descriptor {
 216        __u8  bLength;
 217        __u8  bDescriptorType;
 218
 219        __le16 bcdUSB;
 220        __u8  bDeviceClass;
 221        __u8  bDeviceSubClass;
 222        __u8  bDeviceProtocol;
 223        __u8  bMaxPacketSize0;
 224        __le16 idVendor;
 225        __le16 idProduct;
 226        __le16 bcdDevice;
 227        __u8  iManufacturer;
 228        __u8  iProduct;
 229        __u8  iSerialNumber;
 230        __u8  bNumConfigurations;
 231} __attribute__ ((packed));
 232
 233#define USB_DT_DEVICE_SIZE              18
 234
 235
 236/*
 237 * Device and/or Interface Class codes
 238 * as found in bDeviceClass or bInterfaceClass
 239 * and defined by www.usb.org documents
 240 */
 241#define USB_CLASS_PER_INTERFACE         0       /* for DeviceClass */
 242#define USB_CLASS_AUDIO                 1
 243#define USB_CLASS_COMM                  2
 244#define USB_CLASS_HID                   3
 245#define USB_CLASS_PHYSICAL              5
 246#define USB_CLASS_STILL_IMAGE           6
 247#define USB_CLASS_PRINTER               7
 248#define USB_CLASS_MASS_STORAGE          8
 249#define USB_CLASS_HUB                   9
 250#define USB_CLASS_CDC_DATA              0x0a
 251#define USB_CLASS_CSCID                 0x0b    /* chip+ smart card */
 252#define USB_CLASS_CONTENT_SEC           0x0d    /* content security */
 253#define USB_CLASS_VIDEO                 0x0e
 254#define USB_CLASS_WIRELESS_CONTROLLER   0xe0
 255#define USB_CLASS_MISC                  0xef
 256#define USB_CLASS_APP_SPEC              0xfe
 257#define USB_CLASS_VENDOR_SPEC           0xff
 258
 259/*-------------------------------------------------------------------------*/
 260
 261/* USB_DT_CONFIG: Configuration descriptor information.
 262 *
 263 * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
 264 * descriptor type is different.  Highspeed-capable devices can look
 265 * different depending on what speed they're currently running.  Only
 266 * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
 267 * descriptors.
 268 */
 269struct usb_config_descriptor {
 270        __u8  bLength;
 271        __u8  bDescriptorType;
 272
 273        __le16 wTotalLength;
 274        __u8  bNumInterfaces;
 275        __u8  bConfigurationValue;
 276        __u8  iConfiguration;
 277        __u8  bmAttributes;
 278        __u8  bMaxPower;
 279} __attribute__ ((packed));
 280
 281#define USB_DT_CONFIG_SIZE              9
 282
 283/* from config descriptor bmAttributes */
 284#define USB_CONFIG_ATT_ONE              (1 << 7)        /* must be set */
 285#define USB_CONFIG_ATT_SELFPOWER        (1 << 6)        /* self powered */
 286#define USB_CONFIG_ATT_WAKEUP           (1 << 5)        /* can wakeup */
 287#define USB_CONFIG_ATT_BATTERY          (1 << 4)        /* battery powered */
 288
 289/*-------------------------------------------------------------------------*/
 290
 291/* USB_DT_STRING: String descriptor */
 292struct usb_string_descriptor {
 293        __u8  bLength;
 294        __u8  bDescriptorType;
 295
 296        __le16 wData[1];                /* UTF-16LE encoded */
 297} __attribute__ ((packed));
 298
 299/* note that "string" zero is special, it holds language codes that
 300 * the device supports, not Unicode characters.
 301 */
 302
 303/*-------------------------------------------------------------------------*/
 304
 305/* USB_DT_INTERFACE: Interface descriptor */
 306struct usb_interface_descriptor {
 307        __u8  bLength;
 308        __u8  bDescriptorType;
 309
 310        __u8  bInterfaceNumber;
 311        __u8  bAlternateSetting;
 312        __u8  bNumEndpoints;
 313        __u8  bInterfaceClass;
 314        __u8  bInterfaceSubClass;
 315        __u8  bInterfaceProtocol;
 316        __u8  iInterface;
 317} __attribute__ ((packed));
 318
 319#define USB_DT_INTERFACE_SIZE           9
 320
 321/*-------------------------------------------------------------------------*/
 322
 323/* USB_DT_ENDPOINT: Endpoint descriptor */
 324struct usb_endpoint_descriptor {
 325        __u8  bLength;
 326        __u8  bDescriptorType;
 327
 328        __u8  bEndpointAddress;
 329        __u8  bmAttributes;
 330        __le16 wMaxPacketSize;
 331        __u8  bInterval;
 332
 333        /* NOTE:  these two are _only_ in audio endpoints. */
 334        /* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */
 335        __u8  bRefresh;
 336        __u8  bSynchAddress;
 337} __attribute__ ((packed));
 338
 339#define USB_DT_ENDPOINT_SIZE            7
 340#define USB_DT_ENDPOINT_AUDIO_SIZE      9       /* Audio extension */
 341
 342
 343/*
 344 * Endpoints
 345 */
 346#define USB_ENDPOINT_NUMBER_MASK        0x0f    /* in bEndpointAddress */
 347#define USB_ENDPOINT_DIR_MASK           0x80
 348
 349#define USB_ENDPOINT_XFERTYPE_MASK      0x03    /* in bmAttributes */
 350#define USB_ENDPOINT_XFER_CONTROL       0
 351#define USB_ENDPOINT_XFER_ISOC          1
 352#define USB_ENDPOINT_XFER_BULK          2
 353#define USB_ENDPOINT_XFER_INT           3
 354#define USB_ENDPOINT_MAX_ADJUSTABLE     0x80
 355
 356
 357/*-------------------------------------------------------------------------*/
 358
 359/* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
 360struct usb_qualifier_descriptor {
 361        __u8  bLength;
 362        __u8  bDescriptorType;
 363
 364        __le16 bcdUSB;
 365        __u8  bDeviceClass;
 366        __u8  bDeviceSubClass;
 367        __u8  bDeviceProtocol;
 368        __u8  bMaxPacketSize0;
 369        __u8  bNumConfigurations;
 370        __u8  bRESERVED;
 371} __attribute__ ((packed));
 372
 373
 374/*-------------------------------------------------------------------------*/
 375
 376/* USB_DT_OTG (from OTG 1.0a supplement) */
 377struct usb_otg_descriptor {
 378        __u8  bLength;
 379        __u8  bDescriptorType;
 380
 381        __u8  bmAttributes;     /* support for HNP, SRP, etc */
 382} __attribute__ ((packed));
 383
 384/* from usb_otg_descriptor.bmAttributes */
 385#define USB_OTG_SRP             (1 << 0)
 386#define USB_OTG_HNP             (1 << 1)        /* swap host/device roles */
 387
 388/*-------------------------------------------------------------------------*/
 389
 390/* USB_DT_DEBUG:  for special highspeed devices, replacing serial console */
 391struct usb_debug_descriptor {
 392        __u8  bLength;
 393        __u8  bDescriptorType;
 394
 395        /* bulk endpoints with 8 byte maxpacket */
 396        __u8  bDebugInEndpoint;
 397        __u8  bDebugOutEndpoint;
 398} __attribute__((packed));
 399
 400/*-------------------------------------------------------------------------*/
 401
 402/* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
 403struct usb_interface_assoc_descriptor {
 404        __u8  bLength;
 405        __u8  bDescriptorType;
 406
 407        __u8  bFirstInterface;
 408        __u8  bInterfaceCount;
 409        __u8  bFunctionClass;
 410        __u8  bFunctionSubClass;
 411        __u8  bFunctionProtocol;
 412        __u8  iFunction;
 413} __attribute__ ((packed));
 414
 415
 416/*-------------------------------------------------------------------------*/
 417
 418/* USB_DT_SECURITY:  group of wireless security descriptors, including
 419 * encryption types available for setting up a CC/association.
 420 */
 421struct usb_security_descriptor {
 422        __u8  bLength;
 423        __u8  bDescriptorType;
 424
 425        __le16 wTotalLength;
 426        __u8  bNumEncryptionTypes;
 427} __attribute__((packed));
 428
 429/*-------------------------------------------------------------------------*/
 430
 431/* USB_DT_KEY:  used with {GET,SET}_SECURITY_DATA; only public keys
 432 * may be retrieved.
 433 */
 434struct usb_key_descriptor {
 435        __u8  bLength;
 436        __u8  bDescriptorType;
 437
 438        __u8  tTKID[3];
 439        __u8  bReserved;
 440        __u8  bKeyData[0];
 441} __attribute__((packed));
 442
 443/*-------------------------------------------------------------------------*/
 444
 445/* USB_DT_ENCRYPTION_TYPE:  bundled in DT_SECURITY groups */
 446struct usb_encryption_descriptor {
 447        __u8  bLength;
 448        __u8  bDescriptorType;
 449
 450        __u8  bEncryptionType;
 451#define USB_ENC_TYPE_UNSECURE           0
 452#define USB_ENC_TYPE_WIRED              1       /* non-wireless mode */
 453#define USB_ENC_TYPE_CCM_1              2       /* aes128/cbc session */
 454#define USB_ENC_TYPE_RSA_1              3       /* rsa3072/sha1 auth */
 455        __u8  bEncryptionValue;         /* use in SET_ENCRYPTION */
 456        __u8  bAuthKeyIndex;
 457} __attribute__((packed));
 458
 459
 460/*-------------------------------------------------------------------------*/
 461
 462/* USB_DT_BOS:  group of device-level capabilities */
 463struct usb_bos_descriptor {
 464        __u8  bLength;
 465        __u8  bDescriptorType;
 466
 467        __le16 wTotalLength;
 468        __u8  bNumDeviceCaps;
 469} __attribute__((packed));
 470
 471/*-------------------------------------------------------------------------*/
 472
 473/* USB_DT_DEVICE_CAPABILITY:  grouped with BOS */
 474struct usb_dev_cap_header {
 475        __u8  bLength;
 476        __u8  bDescriptorType;
 477        __u8  bDevCapabilityType;
 478} __attribute__((packed));
 479
 480#define USB_CAP_TYPE_WIRELESS_USB       1
 481
 482struct usb_wireless_cap_descriptor {    /* Ultra Wide Band */
 483        __u8  bLength;
 484        __u8  bDescriptorType;
 485        __u8  bDevCapabilityType;
 486
 487        __u8  bmAttributes;
 488#define USB_WIRELESS_P2P_DRD            (1 << 1)
 489#define USB_WIRELESS_BEACON_MASK        (3 << 2)
 490#define USB_WIRELESS_BEACON_SELF        (1 << 2)
 491#define USB_WIRELESS_BEACON_DIRECTED    (2 << 2)
 492#define USB_WIRELESS_BEACON_NONE        (3 << 2)
 493        __le16 wPHYRates;       /* bit rates, Mbps */
 494#define USB_WIRELESS_PHY_53             (1 << 0)        /* always set */
 495#define USB_WIRELESS_PHY_80             (1 << 1)
 496#define USB_WIRELESS_PHY_107            (1 << 2)        /* always set */
 497#define USB_WIRELESS_PHY_160            (1 << 3)
 498#define USB_WIRELESS_PHY_200            (1 << 4)        /* always set */
 499#define USB_WIRELESS_PHY_320            (1 << 5)
 500#define USB_WIRELESS_PHY_400            (1 << 6)
 501#define USB_WIRELESS_PHY_480            (1 << 7)
 502        __u8  bmTFITXPowerInfo; /* TFI power levels */
 503        __u8  bmFFITXPowerInfo; /* FFI power levels */
 504        __le16 bmBandGroup;
 505        __u8  bReserved;
 506} __attribute__((packed));
 507
 508#define USB_CAP_TYPE_EXT                2
 509
 510struct usb_ext_cap_descriptor {         /* Link Power Management */
 511        __u8  bLength;
 512        __u8  bDescriptorType;
 513        __u8  bDevCapabilityType;
 514        __u8  bmAttributes;
 515#define USB_LPM_SUPPORT                 (1 << 1)        /* supports LPM */
 516} __attribute__((packed));
 517
 518/*-------------------------------------------------------------------------*/
 519
 520/* USB_DT_WIRELESS_ENDPOINT_COMP:  companion descriptor associated with
 521 * each endpoint descriptor for a wireless device
 522 */
 523struct usb_wireless_ep_comp_descriptor {
 524        __u8  bLength;
 525        __u8  bDescriptorType;
 526
 527        __u8  bMaxBurst;
 528        __u8  bMaxSequence;
 529        __le16 wMaxStreamDelay;
 530        __le16 wOverTheAirPacketSize;
 531        __u8  bOverTheAirInterval;
 532        __u8  bmCompAttributes;
 533#define USB_ENDPOINT_SWITCH_MASK        0x03    /* in bmCompAttributes */
 534#define USB_ENDPOINT_SWITCH_NO          0
 535#define USB_ENDPOINT_SWITCH_SWITCH      1
 536#define USB_ENDPOINT_SWITCH_SCALE       2
 537} __attribute__((packed));
 538
 539/*-------------------------------------------------------------------------*/
 540
 541/* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless
 542 * host and a device for connection set up, mutual authentication, and
 543 * exchanging short lived session keys.  The handshake depends on a CC.
 544 */
 545struct usb_handshake {
 546        __u8 bMessageNumber;
 547        __u8 bStatus;
 548        __u8 tTKID[3];
 549        __u8 bReserved;
 550        __u8 CDID[16];
 551        __u8 nonce[16];
 552        __u8 MIC[8];
 553} __attribute__((packed));
 554
 555/*-------------------------------------------------------------------------*/
 556
 557/* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).
 558 * A CC may also be set up using non-wireless secure channels (including
 559 * wired USB!), and some devices may support CCs with multiple hosts.
 560 */
 561struct usb_connection_context {
 562        __u8 CHID[16];          /* persistent host id */
 563        __u8 CDID[16];          /* device id (unique w/in host context) */
 564        __u8 CK[16];            /* connection key */
 565} __attribute__((packed));
 566
 567/*-------------------------------------------------------------------------*/
 568
 569/* USB 2.0 defines three speeds, here's how Linux identifies them */
 570
 571enum usb_device_speed {
 572        USB_SPEED_UNKNOWN = 0,                  /* enumerating */
 573        USB_SPEED_LOW, USB_SPEED_FULL,          /* usb 1.1 */
 574        USB_SPEED_HIGH,                         /* usb 2.0 */
 575        USB_SPEED_VARIABLE,                     /* wireless (usb 2.5) */
 576};
 577
 578enum usb_device_state {
 579        /* NOTATTACHED isn't in the USB spec, and this state acts
 580         * the same as ATTACHED ... but it's clearer this way.
 581         */
 582        USB_STATE_NOTATTACHED = 0,
 583
 584        /* chapter 9 and authentication (wireless) device states */
 585        USB_STATE_ATTACHED,
 586        USB_STATE_POWERED,                      /* wired */
 587        USB_STATE_UNAUTHENTICATED,              /* auth */
 588        USB_STATE_RECONNECTING,                 /* auth */
 589        USB_STATE_DEFAULT,                      /* limited function */
 590        USB_STATE_ADDRESS,
 591        USB_STATE_CONFIGURED,                   /* most functions */
 592
 593        USB_STATE_SUSPENDED
 594
 595        /* NOTE:  there are actually four different SUSPENDED
 596         * states, returning to POWERED, DEFAULT, ADDRESS, or
 597         * CONFIGURED respectively when SOF tokens flow again.
 598         * At this level there's no difference between L1 and L2
 599         * suspend states.  (L2 being original USB 1.1 suspend.)
 600         */
 601};
 602
 603#endif /* __LINUX_USB_CH9_H */
 604