kernel/2.6.29.6-aldebaran-rt/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  */
 146 struct 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 */
 206 struct usb_descriptor_header {
 207         __u8  bLength;
 208         __u8  bDescriptorType;
 209 } __attribute__ ((packed));
 210
 211
 212 /*-------------------------------------------------------------------------*/
 213
 214 /* USB_DT_DEVICE: Device descriptor */
 215 struct 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  */
 269 struct 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 */
 292 struct 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 */
 306 struct 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 */
 324 struct 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 */
 360 struct 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) */
 377 struct 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 */
 391 struct 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 */
 403 struct 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  */
 421 struct 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  */
 434 struct 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 */
 446 struct 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 */
 463 struct 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 */
 474 struct 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
 482 struct 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
 510 struct 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  */
 523 struct 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  */
 545 struct 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  */
 561 struct 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
 571 enum 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
 578 enum 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 */