include/linux/usb_ch9.h

   1 /*
   2  * This file holds USB constants and structures that are needed for USB
   3  * device APIs.  These are used by the USB device model, which is defined
   4  * in chapter 9 of the USB 2.0 specification.  Linux has several APIs in C
   5  * that need these:
   6  *
   7  * - the master/host side Linux-USB kernel driver API;
   8  * - the "usbfs" user space API; and
   9  * - the Linux "gadget" slave/device/peripheral side driver API.
  10  *
  11  * USB 2.0 adds an additional "On The Go" (OTG) mode, which lets systems
  12  * act either as a USB master/host or as a USB slave/device.  That means
  13  * the master and slave side APIs benefit from working well together.
  14  *
  15  * There's also "Wireless USB", using low power short range radios for
  16  * peripheral interconnection but otherwise building on the USB framework.
  17  */
  18
  19 #ifndef __LINUX_USB_CH9_H
  20 #define __LINUX_USB_CH9_H
  21
  22 #include <linux/types.h>        /* __u8 etc */
  23
  24 /*-------------------------------------------------------------------------*/
  25
  26 /* CONTROL REQUEST SUPPORT */
  27
  28 /*
  29  * USB directions
  30  *
  31  * This bit flag is used in endpoint descriptors' bEndpointAddress field.
  32  * It's also one of three fields in control requests bRequestType.
  33  */
  34 #define USB_DIR_OUT                     0               /* to device */
  35 #define USB_DIR_IN                      0x80            /* to host */
  36
  37 /*
  38  * USB types, the second of three bRequestType fields
  39  */
  40 #define USB_TYPE_MASK                   (0x03 << 5)
  41 #define USB_TYPE_STANDARD               (0x00 << 5)
  42 #define USB_TYPE_CLASS                  (0x01 << 5)
  43 #define USB_TYPE_VENDOR                 (0x02 << 5)
  44 #define USB_TYPE_RESERVED               (0x03 << 5)
  45
  46 /*
  47  * USB recipients, the third of three bRequestType fields
  48  */
  49 #define USB_RECIP_MASK                  0x1f
  50 #define USB_RECIP_DEVICE                0x00
  51 #define USB_RECIP_INTERFACE             0x01
  52 #define USB_RECIP_ENDPOINT              0x02
  53 #define USB_RECIP_OTHER                 0x03
  54
  55 /*
  56  * Standard requests, for the bRequest field of a SETUP packet.
  57  *
  58  * These are qualified by the bRequestType field, so that for example
  59  * TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved
  60  * by a GET_STATUS request.
  61  */
  62 #define USB_REQ_GET_STATUS              0x00
  63 #define USB_REQ_CLEAR_FEATURE           0x01
  64 #define USB_REQ_SET_FEATURE             0x03
  65 #define USB_REQ_SET_ADDRESS             0x05
  66 #define USB_REQ_GET_DESCRIPTOR          0x06
  67 #define USB_REQ_SET_DESCRIPTOR          0x07
  68 #define USB_REQ_GET_CONFIGURATION       0x08
  69 #define USB_REQ_SET_CONFIGURATION       0x09
  70 #define USB_REQ_GET_INTERFACE           0x0A
  71 #define USB_REQ_SET_INTERFACE           0x0B
  72 #define USB_REQ_SYNCH_FRAME             0x0C
  73
  74 #define USB_REQ_SET_ENCRYPTION          0x0D    /* Wireless USB */
  75 #define USB_REQ_GET_ENCRYPTION          0x0E
  76 #define USB_REQ_SET_HANDSHAKE           0x0F
  77 #define USB_REQ_GET_HANDSHAKE           0x10
  78 #define USB_REQ_SET_CONNECTION          0x11
  79 #define USB_REQ_SET_SECURITY_DATA       0x12
  80 #define USB_REQ_GET_SECURITY_DATA       0x13
  81 #define USB_REQ_SET_WUSB_DATA           0x14
  82 #define USB_REQ_LOOPBACK_DATA_WRITE     0x15
  83 #define USB_REQ_LOOPBACK_DATA_READ      0x16
  84 #define USB_REQ_SET_INTERFACE_DS        0x17
  85
  86 /*
  87  * USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and
  88  * are read as a bit array returned by USB_REQ_GET_STATUS.  (So there
  89  * are at most sixteen features of each type.)
  90  */
  91 #define USB_DEVICE_SELF_POWERED         0       /* (read only) */
  92 #define USB_DEVICE_REMOTE_WAKEUP        1       /* dev may initiate wakeup */
  93 #define USB_DEVICE_TEST_MODE            2       /* (wired high speed only) */
  94 #define USB_DEVICE_BATTERY              2       /* (wireless) */
  95 #define USB_DEVICE_B_HNP_ENABLE         3       /* (otg) dev may initiate HNP */
  96 #define USB_DEVICE_WUSB_DEVICE          3       /* (wireless)*/
  97 #define USB_DEVICE_A_HNP_SUPPORT        4       /* (otg) RH port supports HNP */
  98 #define USB_DEVICE_A_ALT_HNP_SUPPORT    5       /* (otg) other RH port does */
  99 #define USB_DEVICE_DEBUG_MODE           6       /* (special devices only) */
 100
 101 #define USB_ENDPOINT_HALT               0       /* IN/OUT will STALL */
 102
 103
 104 /**
 105  * struct usb_ctrlrequest - SETUP data for a USB device control request
 106  * @bRequestType: matches the USB bmRequestType field
 107  * @bRequest: matches the USB bRequest field
 108  * @wValue: matches the USB wValue field (le16 byte order)
 109  * @wIndex: matches the USB wIndex field (le16 byte order)
 110  * @wLength: matches the USB wLength field (le16 byte order)
 111  *
 112  * This structure is used to send control requests to a USB device.  It matches
 113  * the different fields of the USB 2.0 Spec section 9.3, table 9-2.  See the
 114  * USB spec for a fuller description of the different fields, and what they are
 115  * used for.
 116  *
 117  * Note that the driver for any interface can issue control requests.
 118  * For most devices, interfaces don't coordinate with each other, so
 119  * such requests may be made at any time.
 120  */
 121 struct usb_ctrlrequest {
 122         __u8 bRequestType;
 123         __u8 bRequest;
 124         __le16 wValue;
 125         __le16 wIndex;
 126         __le16 wLength;
 127 } __attribute__ ((packed));
 128
 129 /*-------------------------------------------------------------------------*/
 130
 131 /*
 132  * STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or
 133  * (rarely) accepted by SET_DESCRIPTOR.
 134  *
 135  * Note that all multi-byte values here are encoded in little endian
 136  * byte order "on the wire".  But when exposed through Linux-USB APIs,
 137  * they've been converted to cpu byte order.
 138  */
 139
 140 /*
 141  * Descriptor types ... USB 2.0 spec table 9.5
 142  */
 143 #define USB_DT_DEVICE                   0x01
 144 #define USB_DT_CONFIG                   0x02
 145 #define USB_DT_STRING                   0x03
 146 #define USB_DT_INTERFACE                0x04
 147 #define USB_DT_ENDPOINT                 0x05
 148 #define USB_DT_DEVICE_QUALIFIER         0x06
 149 #define USB_DT_OTHER_SPEED_CONFIG       0x07
 150 #define USB_DT_INTERFACE_POWER          0x08
 151 /* these are from a minor usb 2.0 revision (ECN) */
 152 #define USB_DT_OTG                      0x09
 153 #define USB_DT_DEBUG                    0x0a
 154 #define USB_DT_INTERFACE_ASSOCIATION    0x0b
 155 /* these are from the Wireless USB spec */
 156 #define USB_DT_SECURITY                 0x0c
 157 #define USB_DT_KEY                      0x0d
 158 #define USB_DT_ENCRYPTION_TYPE          0x0e
 159 #define USB_DT_BOS                      0x0f
 160 #define USB_DT_DEVICE_CAPABILITY        0x10
 161 #define USB_DT_WIRELESS_ENDPOINT_COMP   0x11
 162
 163 /* conventional codes for class-specific descriptors */
 164 #define USB_DT_CS_DEVICE                0x21
 165 #define USB_DT_CS_CONFIG                0x22
 166 #define USB_DT_CS_STRING                0x23
 167 #define USB_DT_CS_INTERFACE             0x24
 168 #define USB_DT_CS_ENDPOINT              0x25
 169
 170 /* All standard descriptors have these 2 fields at the beginning */
 171 struct usb_descriptor_header {
 172         __u8  bLength;
 173         __u8  bDescriptorType;
 174 } __attribute__ ((packed));
 175
 176
 177 /*-------------------------------------------------------------------------*/
 178
 179 /* USB_DT_DEVICE: Device descriptor */
 180 struct usb_device_descriptor {
 181         __u8  bLength;
 182         __u8  bDescriptorType;
 183
 184         __le16 bcdUSB;
 185         __u8  bDeviceClass;
 186         __u8  bDeviceSubClass;
 187         __u8  bDeviceProtocol;
 188         __u8  bMaxPacketSize0;
 189         __le16 idVendor;
 190         __le16 idProduct;
 191         __le16 bcdDevice;
 192         __u8  iManufacturer;
 193         __u8  iProduct;
 194         __u8  iSerialNumber;
 195         __u8  bNumConfigurations;
 196 } __attribute__ ((packed));
 197
 198 #define USB_DT_DEVICE_SIZE              18
 199
 200
 201 /*
 202  * Device and/or Interface Class codes
 203  * as found in bDeviceClass or bInterfaceClass
 204  * and defined by www.usb.org documents
 205  */
 206 #define USB_CLASS_PER_INTERFACE         0       /* for DeviceClass */
 207 #define USB_CLASS_AUDIO                 1
 208 #define USB_CLASS_COMM                  2
 209 #define USB_CLASS_HID                   3
 210 #define USB_CLASS_PHYSICAL              5
 211 #define USB_CLASS_STILL_IMAGE           6
 212 #define USB_CLASS_PRINTER               7
 213 #define USB_CLASS_MASS_STORAGE          8
 214 #define USB_CLASS_HUB                   9
 215 #define USB_CLASS_CDC_DATA              0x0a
 216 #define USB_CLASS_CSCID                 0x0b    /* chip+ smart card */
 217 #define USB_CLASS_CONTENT_SEC           0x0d    /* content security */
 218 #define USB_CLASS_VIDEO                 0x0e
 219 #define USB_CLASS_WIRELESS_CONTROLLER   0xe0
 220 #define USB_CLASS_APP_SPEC              0xfe
 221 #define USB_CLASS_VENDOR_SPEC           0xff
 222
 223 /*-------------------------------------------------------------------------*/
 224
 225 /* USB_DT_CONFIG: Configuration descriptor information.
 226  *
 227  * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
 228  * descriptor type is different.  Highspeed-capable devices can look
 229  * different depending on what speed they're currently running.  Only
 230  * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
 231  * descriptors.
 232  */
 233 struct usb_config_descriptor {
 234         __u8  bLength;
 235         __u8  bDescriptorType;
 236
 237         __le16 wTotalLength;
 238         __u8  bNumInterfaces;
 239         __u8  bConfigurationValue;
 240         __u8  iConfiguration;
 241         __u8  bmAttributes;
 242         __u8  bMaxPower;
 243 } __attribute__ ((packed));
 244
 245 #define USB_DT_CONFIG_SIZE              9
 246
 247 /* from config descriptor bmAttributes */
 248 #define USB_CONFIG_ATT_ONE              (1 << 7)        /* must be set */
 249 #define USB_CONFIG_ATT_SELFPOWER        (1 << 6)        /* self powered */
 250 #define USB_CONFIG_ATT_WAKEUP           (1 << 5)        /* can wakeup */
 251 #define USB_CONFIG_ATT_BATTERY          (1 << 4)        /* battery powered */
 252
 253 /*-------------------------------------------------------------------------*/
 254
 255 /* USB_DT_STRING: String descriptor */
 256 struct usb_string_descriptor {
 257         __u8  bLength;
 258         __u8  bDescriptorType;
 259
 260         __le16 wData[1];                /* UTF-16LE encoded */
 261 } __attribute__ ((packed));
 262
 263 /* note that "string" zero is special, it holds language codes that
 264  * the device supports, not Unicode characters.
 265  */
 266
 267 /*-------------------------------------------------------------------------*/
 268
 269 /* USB_DT_INTERFACE: Interface descriptor */
 270 struct usb_interface_descriptor {
 271         __u8  bLength;
 272         __u8  bDescriptorType;
 273
 274         __u8  bInterfaceNumber;
 275         __u8  bAlternateSetting;
 276         __u8  bNumEndpoints;
 277         __u8  bInterfaceClass;
 278         __u8  bInterfaceSubClass;
 279         __u8  bInterfaceProtocol;
 280         __u8  iInterface;
 281 } __attribute__ ((packed));
 282
 283 #define USB_DT_INTERFACE_SIZE           9
 284
 285 /*-------------------------------------------------------------------------*/
 286
 287 /* USB_DT_ENDPOINT: Endpoint descriptor */
 288 struct usb_endpoint_descriptor {
 289         __u8  bLength;
 290         __u8  bDescriptorType;
 291
 292         __u8  bEndpointAddress;
 293         __u8  bmAttributes;
 294         __le16 wMaxPacketSize;
 295         __u8  bInterval;
 296
 297         /* NOTE:  these two are _only_ in audio endpoints. */
 298         /* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */
 299         __u8  bRefresh;
 300         __u8  bSynchAddress;
 301 } __attribute__ ((packed));
 302
 303 #define USB_DT_ENDPOINT_SIZE            7
 304 #define USB_DT_ENDPOINT_AUDIO_SIZE      9       /* Audio extension */
 305
 306
 307 /*
 308  * Endpoints
 309  */
 310 #define USB_ENDPOINT_NUMBER_MASK        0x0f    /* in bEndpointAddress */
 311 #define USB_ENDPOINT_DIR_MASK           0x80
 312
 313 #define USB_ENDPOINT_XFERTYPE_MASK      0x03    /* in bmAttributes */
 314 #define USB_ENDPOINT_XFER_CONTROL       0
 315 #define USB_ENDPOINT_XFER_ISOC          1
 316 #define USB_ENDPOINT_XFER_BULK          2
 317 #define USB_ENDPOINT_XFER_INT           3
 318 #define USB_ENDPOINT_MAX_ADJUSTABLE     0x80
 319
 320
 321 /*-------------------------------------------------------------------------*/
 322
 323 /* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
 324 struct usb_qualifier_descriptor {
 325         __u8  bLength;
 326         __u8  bDescriptorType;
 327
 328         __le16 bcdUSB;
 329         __u8  bDeviceClass;
 330         __u8  bDeviceSubClass;
 331         __u8  bDeviceProtocol;
 332         __u8  bMaxPacketSize0;
 333         __u8  bNumConfigurations;
 334         __u8  bRESERVED;
 335 } __attribute__ ((packed));
 336
 337
 338 /*-------------------------------------------------------------------------*/
 339
 340 /* USB_DT_OTG (from OTG 1.0a supplement) */
 341 struct usb_otg_descriptor {
 342         __u8  bLength;
 343         __u8  bDescriptorType;
 344
 345         __u8  bmAttributes;     /* support for HNP, SRP, etc */
 346 } __attribute__ ((packed));
 347
 348 /* from usb_otg_descriptor.bmAttributes */
 349 #define USB_OTG_SRP             (1 << 0)
 350 #define USB_OTG_HNP             (1 << 1)        /* swap host/device roles */
 351
 352 /*-------------------------------------------------------------------------*/
 353
 354 /* USB_DT_DEBUG:  for special highspeed devices, replacing serial console */
 355 struct usb_debug_descriptor {
 356         __u8  bLength;
 357         __u8  bDescriptorType;
 358
 359         /* bulk endpoints with 8 byte maxpacket */
 360         __u8  bDebugInEndpoint;
 361         __u8  bDebugOutEndpoint;
 362 };
 363
 364 /*-------------------------------------------------------------------------*/
 365
 366 /* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
 367 struct usb_interface_assoc_descriptor {
 368         __u8  bLength;
 369         __u8  bDescriptorType;
 370
 371         __u8  bFirstInterface;
 372         __u8  bInterfaceCount;
 373         __u8  bFunctionClass;
 374         __u8  bFunctionSubClass;
 375         __u8  bFunctionProtocol;
 376         __u8  iFunction;
 377 } __attribute__ ((packed));
 378
 379
 380 /*-------------------------------------------------------------------------*/
 381
 382 /* USB_DT_SECURITY:  group of wireless security descriptors, including
 383  * encryption types available for setting up a CC/association.
 384  */
 385 struct usb_security_descriptor {
 386         __u8  bLength;
 387         __u8  bDescriptorType;
 388
 389         __le16 wTotalLength;
 390         __u8  bNumEncryptionTypes;
 391 };
 392
 393 /*-------------------------------------------------------------------------*/
 394
 395 /* USB_DT_KEY:  used with {GET,SET}_SECURITY_DATA; only public keys
 396  * may be retrieved.
 397  */
 398 struct usb_key_descriptor {
 399         __u8  bLength;
 400         __u8  bDescriptorType;
 401
 402         __u8  tTKID[3];
 403         __u8  bReserved;
 404         __u8  bKeyData[0];
 405 };
 406
 407 /*-------------------------------------------------------------------------*/
 408
 409 /* USB_DT_ENCRYPTION_TYPE:  bundled in DT_SECURITY groups */
 410 struct usb_encryption_descriptor {
 411         __u8  bLength;
 412         __u8  bDescriptorType;
 413
 414         __u8  bEncryptionType;
 415 #define USB_ENC_TYPE_UNSECURE           0
 416 #define USB_ENC_TYPE_WIRED              1       /* non-wireless mode */
 417 #define USB_ENC_TYPE_CCM_1              2       /* aes128/cbc session */
 418 #define USB_ENC_TYPE_RSA_1              3       /* rsa3072/sha1 auth */
 419         __u8  bEncryptionValue;         /* use in SET_ENCRYPTION */
 420         __u8  bAuthKeyIndex;
 421 };
 422
 423
 424 /*-------------------------------------------------------------------------*/
 425
 426 /* USB_DT_BOS:  group of wireless capabilities */
 427 struct usb_bos_descriptor {
 428         __u8  bLength;
 429         __u8  bDescriptorType;
 430
 431         __le16 wTotalLength;
 432         __u8  bNumDeviceCaps;
 433 };
 434
 435 /*-------------------------------------------------------------------------*/
 436
 437 /* USB_DT_DEVICE_CAPABILITY:  grouped with BOS */
 438 struct usb_dev_cap_header {
 439         __u8  bLength;
 440         __u8  bDescriptorType;
 441         __u8  bDevCapabilityType;
 442 };
 443
 444 #define USB_CAP_TYPE_WIRELESS_USB       1
 445
 446 struct usb_wireless_cap_descriptor {    /* Ultra Wide Band */
 447         __u8  bLength;
 448         __u8  bDescriptorType;
 449         __u8  bDevCapabilityType;
 450
 451         __u8  bmAttributes;
 452 #define USB_WIRELESS_P2P_DRD            (1 << 1)
 453 #define USB_WIRELESS_BEACON_MASK        (3 << 2)
 454 #define USB_WIRELESS_BEACON_SELF        (1 << 2)
 455 #define USB_WIRELESS_BEACON_DIRECTED    (2 << 2)
 456 #define USB_WIRELESS_BEACON_NONE        (3 << 2)
 457         __le16 wPHYRates;       /* bit rates, Mbps */
 458 #define USB_WIRELESS_PHY_53             (1 << 0)        /* always set */
 459 #define USB_WIRELESS_PHY_80             (1 << 1)
 460 #define USB_WIRELESS_PHY_107            (1 << 2)        /* always set */
 461 #define USB_WIRELESS_PHY_160            (1 << 3)
 462 #define USB_WIRELESS_PHY_200            (1 << 4)        /* always set */
 463 #define USB_WIRELESS_PHY_320            (1 << 5)
 464 #define USB_WIRELESS_PHY_400            (1 << 6)
 465 #define USB_WIRELESS_PHY_480            (1 << 7)
 466         __u8  bmTFITXPowerInfo; /* TFI power levels */
 467         __u8  bmFFITXPowerInfo; /* FFI power levels */
 468         __le16 bmBandGroup;
 469         __u8  bReserved;
 470 };
 471
 472 /*-------------------------------------------------------------------------*/
 473
 474 /* USB_DT_WIRELESS_ENDPOINT_COMP:  companion descriptor associated with
 475  * each endpoint descriptor for a wireless device
 476  */
 477 struct usb_wireless_ep_comp_descriptor {
 478         __u8  bLength;
 479         __u8  bDescriptorType;
 480
 481         __u8  bMaxBurst;
 482         __u8  bMaxSequence;
 483         __le16 wMaxStreamDelay;
 484         __le16 wOverTheAirPacketSize;
 485         __u8  bOverTheAirInterval;
 486         __u8  bmCompAttributes;
 487 #define USB_ENDPOINT_SWITCH_MASK        0x03    /* in bmCompAttributes */
 488 #define USB_ENDPOINT_SWITCH_NO          0
 489 #define USB_ENDPOINT_SWITCH_SWITCH      1
 490 #define USB_ENDPOINT_SWITCH_SCALE       2
 491 };
 492
 493 /*-------------------------------------------------------------------------*/
 494
 495 /* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless
 496  * host and a device for connection set up, mutual authentication, and
 497  * exchanging short lived session keys.  The handshake depends on a CC.
 498  */
 499 struct usb_handshake {
 500         __u8 bMessageNumber;
 501         __u8 bStatus;
 502         __u8 tTKID[3];
 503         __u8 bReserved;
 504         __u8 CDID[16];
 505         __u8 nonce[16];
 506         __u8 MIC[8];
 507 };
 508
 509 /*-------------------------------------------------------------------------*/
 510
 511 /* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).
 512  * A CC may also be set up using non-wireless secure channels (including
 513  * wired USB!), and some devices may support CCs with multiple hosts.
 514  */
 515 struct usb_connection_context {
 516         __u8 CHID[16];          /* persistent host id */
 517         __u8 CDID[16];          /* device id (unique w/in host context) */
 518         __u8 CK[16];            /* connection key */
 519 };
 520
 521 /*-------------------------------------------------------------------------*/
 522
 523 /* USB 2.0 defines three speeds, here's how Linux identifies them */
 524
 525 enum usb_device_speed {
 526         USB_SPEED_UNKNOWN = 0,                  /* enumerating */
 527         USB_SPEED_LOW, USB_SPEED_FULL,          /* usb 1.1 */
 528         USB_SPEED_HIGH,                         /* usb 2.0 */
 529         USB_SPEED_VARIABLE,                     /* wireless (usb 2.5) */
 530 };
 531
 532 enum usb_device_state {
 533         /* NOTATTACHED isn't in the USB spec, and this state acts
 534          * the same as ATTACHED ... but it's clearer this way.
 535          */
 536         USB_STATE_NOTATTACHED = 0,
 537
 538         /* the chapter 9 device states */
 539         USB_STATE_ATTACHED,
 540         USB_STATE_POWERED,
 541         USB_STATE_DEFAULT,                      /* limited function */
 542         USB_STATE_ADDRESS,
 543         USB_STATE_CONFIGURED,                   /* most functions */
 544
 545         USB_STATE_SUSPENDED
 546
 547         /* NOTE:  there are actually four different SUSPENDED
 548          * states, returning to POWERED, DEFAULT, ADDRESS, or
 549          * CONFIGURED respectively when SOF tokens flow again.
 550          */
 551 };
 552
 553 #endif  /* __LINUX_USB_CH9_H */