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".  But when exposed through Linux-USB APIs,
 162  * they've been converted to cpu byte order.
 163  */
 164
 165 /*
 166  * Descriptor types ... USB 2.0 spec table 9.5
 167  */
 168 #define USB_DT_DEVICE                   0x01
 169 #define USB_DT_CONFIG                   0x02
 170 #define USB_DT_STRING                   0x03
 171 #define USB_DT_INTERFACE                0x04
 172 #define USB_DT_ENDPOINT                 0x05
 173 #define USB_DT_DEVICE_QUALIFIER         0x06
 174 #define USB_DT_OTHER_SPEED_CONFIG       0x07
 175 #define USB_DT_INTERFACE_POWER          0x08
 176 /* these are from a minor usb 2.0 revision (ECN) */
 177 #define USB_DT_OTG                      0x09
 178 #define USB_DT_DEBUG                    0x0a
 179 #define USB_DT_INTERFACE_ASSOCIATION    0x0b
 180 /* these are from the Wireless USB spec */
 181 #define USB_DT_SECURITY                 0x0c
 182 #define USB_DT_KEY                      0x0d
 183 #define USB_DT_ENCRYPTION_TYPE          0x0e
 184 #define USB_DT_BOS                      0x0f
 185 #define USB_DT_DEVICE_CAPABILITY        0x10
 186 #define USB_DT_WIRELESS_ENDPOINT_COMP   0x11
 187 #define USB_DT_WIRE_ADAPTER             0x21
 188 #define USB_DT_RPIPE                    0x22
 189 #define USB_DT_CS_RADIO_CONTROL         0x23
 190
 191 /* Conventional codes for class-specific descriptors.  The convention is
 192  * defined in the USB "Common Class" Spec (3.11).  Individual class specs
 193  * are authoritative for their usage, not the "common class" writeup.
 194  */
 195 #define USB_DT_CS_DEVICE                (USB_TYPE_CLASS | USB_DT_DEVICE)
 196 #define USB_DT_CS_CONFIG                (USB_TYPE_CLASS | USB_DT_CONFIG)
 197 #define USB_DT_CS_STRING                (USB_TYPE_CLASS | USB_DT_STRING)
 198 #define USB_DT_CS_INTERFACE             (USB_TYPE_CLASS | USB_DT_INTERFACE)
 199 #define USB_DT_CS_ENDPOINT              (USB_TYPE_CLASS | USB_DT_ENDPOINT)
 200
 201 /* All standard descriptors have these 2 fields at the beginning */
 202 struct usb_descriptor_header {
 203         __u8  bLength;
 204         __u8  bDescriptorType;
 205 } __attribute__ ((packed));
 206
 207
 208 /*-------------------------------------------------------------------------*/
 209
 210 /* USB_DT_DEVICE: Device descriptor */
 211 struct usb_device_descriptor {
 212         __u8  bLength;
 213         __u8  bDescriptorType;
 214
 215         __le16 bcdUSB;
 216         __u8  bDeviceClass;
 217         __u8  bDeviceSubClass;
 218         __u8  bDeviceProtocol;
 219         __u8  bMaxPacketSize0;
 220         __le16 idVendor;
 221         __le16 idProduct;
 222         __le16 bcdDevice;
 223         __u8  iManufacturer;
 224         __u8  iProduct;
 225         __u8  iSerialNumber;
 226         __u8  bNumConfigurations;
 227 } __attribute__ ((packed));
 228
 229 #define USB_DT_DEVICE_SIZE              18
 230
 231
 232 /*
 233  * Device and/or Interface Class codes
 234  * as found in bDeviceClass or bInterfaceClass
 235  * and defined by www.usb.org documents
 236  */
 237 #define USB_CLASS_PER_INTERFACE         0       /* for DeviceClass */
 238 #define USB_CLASS_AUDIO                 1
 239 #define USB_CLASS_COMM                  2
 240 #define USB_CLASS_HID                   3
 241 #define USB_CLASS_PHYSICAL              5
 242 #define USB_CLASS_STILL_IMAGE           6
 243 #define USB_CLASS_PRINTER               7
 244 #define USB_CLASS_MASS_STORAGE          8
 245 #define USB_CLASS_HUB                   9
 246 #define USB_CLASS_CDC_DATA              0x0a
 247 #define USB_CLASS_CSCID                 0x0b    /* chip+ smart card */
 248 #define USB_CLASS_CONTENT_SEC           0x0d    /* content security */
 249 #define USB_CLASS_VIDEO                 0x0e
 250 #define USB_CLASS_WIRELESS_CONTROLLER   0xe0
 251 #define USB_CLASS_MISC                  0xef
 252 #define USB_CLASS_APP_SPEC              0xfe
 253 #define USB_CLASS_VENDOR_SPEC           0xff
 254
 255 /*-------------------------------------------------------------------------*/
 256
 257 /* USB_DT_CONFIG: Configuration descriptor information.
 258  *
 259  * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
 260  * descriptor type is different.  Highspeed-capable devices can look
 261  * different depending on what speed they're currently running.  Only
 262  * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
 263  * descriptors.
 264  */
 265 struct usb_config_descriptor {
 266         __u8  bLength;
 267         __u8  bDescriptorType;
 268
 269         __le16 wTotalLength;
 270         __u8  bNumInterfaces;
 271         __u8  bConfigurationValue;
 272         __u8  iConfiguration;
 273         __u8  bmAttributes;
 274         __u8  bMaxPower;
 275 } __attribute__ ((packed));
 276
 277 #define USB_DT_CONFIG_SIZE              9
 278
 279 /* from config descriptor bmAttributes */
 280 #define USB_CONFIG_ATT_ONE              (1 << 7)        /* must be set */
 281 #define USB_CONFIG_ATT_SELFPOWER        (1 << 6)        /* self powered */
 282 #define USB_CONFIG_ATT_WAKEUP           (1 << 5)        /* can wakeup */
 283 #define USB_CONFIG_ATT_BATTERY          (1 << 4)        /* battery powered */
 284
 285 /*-------------------------------------------------------------------------*/
 286
 287 /* USB_DT_STRING: String descriptor */
 288 struct usb_string_descriptor {
 289         __u8  bLength;
 290         __u8  bDescriptorType;
 291
 292         __le16 wData[1];                /* UTF-16LE encoded */
 293 } __attribute__ ((packed));
 294
 295 /* note that "string" zero is special, it holds language codes that
 296  * the device supports, not Unicode characters.
 297  */
 298
 299 /*-------------------------------------------------------------------------*/
 300
 301 /* USB_DT_INTERFACE: Interface descriptor */
 302 struct usb_interface_descriptor {
 303         __u8  bLength;
 304         __u8  bDescriptorType;
 305
 306         __u8  bInterfaceNumber;
 307         __u8  bAlternateSetting;
 308         __u8  bNumEndpoints;
 309         __u8  bInterfaceClass;
 310         __u8  bInterfaceSubClass;
 311         __u8  bInterfaceProtocol;
 312         __u8  iInterface;
 313 } __attribute__ ((packed));
 314
 315 #define USB_DT_INTERFACE_SIZE           9
 316
 317 /*-------------------------------------------------------------------------*/
 318
 319 /* USB_DT_ENDPOINT: Endpoint descriptor */
 320 struct usb_endpoint_descriptor {
 321         __u8  bLength;
 322         __u8  bDescriptorType;
 323
 324         __u8  bEndpointAddress;
 325         __u8  bmAttributes;
 326         __le16 wMaxPacketSize;
 327         __u8  bInterval;
 328
 329         /* NOTE:  these two are _only_ in audio endpoints. */
 330         /* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */
 331         __u8  bRefresh;
 332         __u8  bSynchAddress;
 333 } __attribute__ ((packed));
 334
 335 #define USB_DT_ENDPOINT_SIZE            7
 336 #define USB_DT_ENDPOINT_AUDIO_SIZE      9       /* Audio extension */
 337
 338
 339 /*
 340  * Endpoints
 341  */
 342 #define USB_ENDPOINT_NUMBER_MASK        0x0f    /* in bEndpointAddress */
 343 #define USB_ENDPOINT_DIR_MASK           0x80
 344
 345 #define USB_ENDPOINT_XFERTYPE_MASK      0x03    /* in bmAttributes */
 346 #define USB_ENDPOINT_XFER_CONTROL       0
 347 #define USB_ENDPOINT_XFER_ISOC          1
 348 #define USB_ENDPOINT_XFER_BULK          2
 349 #define USB_ENDPOINT_XFER_INT           3
 350 #define USB_ENDPOINT_MAX_ADJUSTABLE     0x80
 351
 352
 353 /*-------------------------------------------------------------------------*/
 354
 355 /* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
 356 struct usb_qualifier_descriptor {
 357         __u8  bLength;
 358         __u8  bDescriptorType;
 359
 360         __le16 bcdUSB;
 361         __u8  bDeviceClass;
 362         __u8  bDeviceSubClass;
 363         __u8  bDeviceProtocol;
 364         __u8  bMaxPacketSize0;
 365         __u8  bNumConfigurations;
 366         __u8  bRESERVED;
 367 } __attribute__ ((packed));
 368
 369
 370 /*-------------------------------------------------------------------------*/
 371
 372 /* USB_DT_OTG (from OTG 1.0a supplement) */
 373 struct usb_otg_descriptor {
 374         __u8  bLength;
 375         __u8  bDescriptorType;
 376
 377         __u8  bmAttributes;     /* support for HNP, SRP, etc */
 378 } __attribute__ ((packed));
 379
 380 /* from usb_otg_descriptor.bmAttributes */
 381 #define USB_OTG_SRP             (1 << 0)
 382 #define USB_OTG_HNP             (1 << 1)        /* swap host/device roles */
 383
 384 /*-------------------------------------------------------------------------*/
 385
 386 /* USB_DT_DEBUG:  for special highspeed devices, replacing serial console */
 387 struct usb_debug_descriptor {
 388         __u8  bLength;
 389         __u8  bDescriptorType;
 390
 391         /* bulk endpoints with 8 byte maxpacket */
 392         __u8  bDebugInEndpoint;
 393         __u8  bDebugOutEndpoint;
 394 } __attribute__((packed));
 395
 396 /*-------------------------------------------------------------------------*/
 397
 398 /* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
 399 struct usb_interface_assoc_descriptor {
 400         __u8  bLength;
 401         __u8  bDescriptorType;
 402
 403         __u8  bFirstInterface;
 404         __u8  bInterfaceCount;
 405         __u8  bFunctionClass;
 406         __u8  bFunctionSubClass;
 407         __u8  bFunctionProtocol;
 408         __u8  iFunction;
 409 } __attribute__ ((packed));
 410
 411
 412 /*-------------------------------------------------------------------------*/
 413
 414 /* USB_DT_SECURITY:  group of wireless security descriptors, including
 415  * encryption types available for setting up a CC/association.
 416  */
 417 struct usb_security_descriptor {
 418         __u8  bLength;
 419         __u8  bDescriptorType;
 420
 421         __le16 wTotalLength;
 422         __u8  bNumEncryptionTypes;
 423 } __attribute__((packed));
 424
 425 /*-------------------------------------------------------------------------*/
 426
 427 /* USB_DT_KEY:  used with {GET,SET}_SECURITY_DATA; only public keys
 428  * may be retrieved.
 429  */
 430 struct usb_key_descriptor {
 431         __u8  bLength;
 432         __u8  bDescriptorType;
 433
 434         __u8  tTKID[3];
 435         __u8  bReserved;
 436         __u8  bKeyData[0];
 437 } __attribute__((packed));
 438
 439 /*-------------------------------------------------------------------------*/
 440
 441 /* USB_DT_ENCRYPTION_TYPE:  bundled in DT_SECURITY groups */
 442 struct usb_encryption_descriptor {
 443         __u8  bLength;
 444         __u8  bDescriptorType;
 445
 446         __u8  bEncryptionType;
 447 #define USB_ENC_TYPE_UNSECURE           0
 448 #define USB_ENC_TYPE_WIRED              1       /* non-wireless mode */
 449 #define USB_ENC_TYPE_CCM_1              2       /* aes128/cbc session */
 450 #define USB_ENC_TYPE_RSA_1              3       /* rsa3072/sha1 auth */
 451         __u8  bEncryptionValue;         /* use in SET_ENCRYPTION */
 452         __u8  bAuthKeyIndex;
 453 } __attribute__((packed));
 454
 455
 456 /*-------------------------------------------------------------------------*/
 457
 458 /* USB_DT_BOS:  group of device-level capabilities */
 459 struct usb_bos_descriptor {
 460         __u8  bLength;
 461         __u8  bDescriptorType;
 462
 463         __le16 wTotalLength;
 464         __u8  bNumDeviceCaps;
 465 } __attribute__((packed));
 466
 467 /*-------------------------------------------------------------------------*/
 468
 469 /* USB_DT_DEVICE_CAPABILITY:  grouped with BOS */
 470 struct usb_dev_cap_header {
 471         __u8  bLength;
 472         __u8  bDescriptorType;
 473         __u8  bDevCapabilityType;
 474 } __attribute__((packed));
 475
 476 #define USB_CAP_TYPE_WIRELESS_USB       1
 477
 478 struct usb_wireless_cap_descriptor {    /* Ultra Wide Band */
 479         __u8  bLength;
 480         __u8  bDescriptorType;
 481         __u8  bDevCapabilityType;
 482
 483         __u8  bmAttributes;
 484 #define USB_WIRELESS_P2P_DRD            (1 << 1)
 485 #define USB_WIRELESS_BEACON_MASK        (3 << 2)
 486 #define USB_WIRELESS_BEACON_SELF        (1 << 2)
 487 #define USB_WIRELESS_BEACON_DIRECTED    (2 << 2)
 488 #define USB_WIRELESS_BEACON_NONE        (3 << 2)
 489         __le16 wPHYRates;       /* bit rates, Mbps */
 490 #define USB_WIRELESS_PHY_53             (1 << 0)        /* always set */
 491 #define USB_WIRELESS_PHY_80             (1 << 1)
 492 #define USB_WIRELESS_PHY_107            (1 << 2)        /* always set */
 493 #define USB_WIRELESS_PHY_160            (1 << 3)
 494 #define USB_WIRELESS_PHY_200            (1 << 4)        /* always set */
 495 #define USB_WIRELESS_PHY_320            (1 << 5)
 496 #define USB_WIRELESS_PHY_400            (1 << 6)
 497 #define USB_WIRELESS_PHY_480            (1 << 7)
 498         __u8  bmTFITXPowerInfo; /* TFI power levels */
 499         __u8  bmFFITXPowerInfo; /* FFI power levels */
 500         __le16 bmBandGroup;
 501         __u8  bReserved;
 502 } __attribute__((packed));
 503
 504 #define USB_CAP_TYPE_EXT                2
 505
 506 struct usb_ext_cap_descriptor {         /* Link Power Management */
 507         __u8  bLength;
 508         __u8  bDescriptorType;
 509         __u8  bDevCapabilityType;
 510         __u8  bmAttributes;
 511 #define USB_LPM_SUPPORT                 (1 << 1)        /* supports LPM */
 512 } __attribute__((packed));
 513
 514 /*-------------------------------------------------------------------------*/
 515
 516 /* USB_DT_WIRELESS_ENDPOINT_COMP:  companion descriptor associated with
 517  * each endpoint descriptor for a wireless device
 518  */
 519 struct usb_wireless_ep_comp_descriptor {
 520         __u8  bLength;
 521         __u8  bDescriptorType;
 522
 523         __u8  bMaxBurst;
 524         __u8  bMaxSequence;
 525         __le16 wMaxStreamDelay;
 526         __le16 wOverTheAirPacketSize;
 527         __u8  bOverTheAirInterval;
 528         __u8  bmCompAttributes;
 529 #define USB_ENDPOINT_SWITCH_MASK        0x03    /* in bmCompAttributes */
 530 #define USB_ENDPOINT_SWITCH_NO          0
 531 #define USB_ENDPOINT_SWITCH_SWITCH      1
 532 #define USB_ENDPOINT_SWITCH_SCALE       2
 533 } __attribute__((packed));
 534
 535 /*-------------------------------------------------------------------------*/
 536
 537 /* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless
 538  * host and a device for connection set up, mutual authentication, and
 539  * exchanging short lived session keys.  The handshake depends on a CC.
 540  */
 541 struct usb_handshake {
 542         __u8 bMessageNumber;
 543         __u8 bStatus;
 544         __u8 tTKID[3];
 545         __u8 bReserved;
 546         __u8 CDID[16];
 547         __u8 nonce[16];
 548         __u8 MIC[8];
 549 } __attribute__((packed));
 550
 551 /*-------------------------------------------------------------------------*/
 552
 553 /* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).
 554  * A CC may also be set up using non-wireless secure channels (including
 555  * wired USB!), and some devices may support CCs with multiple hosts.
 556  */
 557 struct usb_connection_context {
 558         __u8 CHID[16];          /* persistent host id */
 559         __u8 CDID[16];          /* device id (unique w/in host context) */
 560         __u8 CK[16];            /* connection key */
 561 } __attribute__((packed));
 562
 563 /*-------------------------------------------------------------------------*/
 564
 565 /* USB 2.0 defines three speeds, here's how Linux identifies them */
 566
 567 enum usb_device_speed {
 568         USB_SPEED_UNKNOWN = 0,                  /* enumerating */
 569         USB_SPEED_LOW, USB_SPEED_FULL,          /* usb 1.1 */
 570         USB_SPEED_HIGH,                         /* usb 2.0 */
 571         USB_SPEED_VARIABLE,                     /* wireless (usb 2.5) */
 572 };
 573
 574 enum usb_device_state {
 575         /* NOTATTACHED isn't in the USB spec, and this state acts
 576          * the same as ATTACHED ... but it's clearer this way.
 577          */
 578         USB_STATE_NOTATTACHED = 0,
 579
 580         /* chapter 9 and authentication (wireless) device states */
 581         USB_STATE_ATTACHED,
 582         USB_STATE_POWERED,                      /* wired */
 583         USB_STATE_UNAUTHENTICATED,              /* auth */
 584         USB_STATE_RECONNECTING,                 /* auth */
 585         USB_STATE_DEFAULT,                      /* limited function */
 586         USB_STATE_ADDRESS,
 587         USB_STATE_CONFIGURED,                   /* most functions */
 588
 589         USB_STATE_SUSPENDED
 590
 591         /* NOTE:  there are actually four different SUSPENDED
 592          * states, returning to POWERED, DEFAULT, ADDRESS, or
 593          * CONFIGURED respectively when SOF tokens flow again.
 594          * At this level there's no difference between L1 and L2
 595          * suspend states.  (L2 being original USB 1.1 suspend.)
 596          */
 597 };
 598
 599 #endif /* __LINUX_USB_CH9_H */