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 /* From Wireless USB 1.0 */
  55 #define USB_RECIP_PORT                  0x04
  56 #define USB_RECIP_RPIPE                 0x05
  57
  58 /*
  59  * Standard requests, for the bRequest field of a SETUP packet.
  60  *
  61  * These are qualified by the bRequestType field, so that for example
  62  * TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved
  63  * by a GET_STATUS request.
  64  */
  65 #define USB_REQ_GET_STATUS              0x00
  66 #define USB_REQ_CLEAR_FEATURE           0x01
  67 #define USB_REQ_SET_FEATURE             0x03
  68 #define USB_REQ_SET_ADDRESS             0x05
  69 #define USB_REQ_GET_DESCRIPTOR          0x06
  70 #define USB_REQ_SET_DESCRIPTOR          0x07
  71 #define USB_REQ_GET_CONFIGURATION       0x08
  72 #define USB_REQ_SET_CONFIGURATION       0x09
  73 #define USB_REQ_GET_INTERFACE           0x0A
  74 #define USB_REQ_SET_INTERFACE           0x0B
  75 #define USB_REQ_SYNCH_FRAME             0x0C
  76
  77 #define USB_REQ_SET_ENCRYPTION          0x0D    /* Wireless USB */
  78 #define USB_REQ_GET_ENCRYPTION          0x0E
  79 #define USB_REQ_RPIPE_ABORT             0x0E
  80 #define USB_REQ_SET_HANDSHAKE           0x0F
  81 #define USB_REQ_RPIPE_RESET             0x0F
  82 #define USB_REQ_GET_HANDSHAKE           0x10
  83 #define USB_REQ_SET_CONNECTION          0x11
  84 #define USB_REQ_SET_SECURITY_DATA       0x12
  85 #define USB_REQ_GET_SECURITY_DATA       0x13
  86 #define USB_REQ_SET_WUSB_DATA           0x14
  87 #define USB_REQ_LOOPBACK_DATA_WRITE     0x15
  88 #define USB_REQ_LOOPBACK_DATA_READ      0x16
  89 #define USB_REQ_SET_INTERFACE_DS        0x17
  90
  91 /*
  92  * USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and
  93  * are read as a bit array returned by USB_REQ_GET_STATUS.  (So there
  94  * are at most sixteen features of each type.)
  95  */
  96 #define USB_DEVICE_SELF_POWERED         0       /* (read only) */
  97 #define USB_DEVICE_REMOTE_WAKEUP        1       /* dev may initiate wakeup */
  98 #define USB_DEVICE_TEST_MODE            2       /* (wired high speed only) */
  99 #define USB_DEVICE_BATTERY              2       /* (wireless) */
 100 #define USB_DEVICE_B_HNP_ENABLE         3       /* (otg) dev may initiate HNP */
 101 #define USB_DEVICE_WUSB_DEVICE          3       /* (wireless)*/
 102 #define USB_DEVICE_A_HNP_SUPPORT        4       /* (otg) RH port supports HNP */
 103 #define USB_DEVICE_A_ALT_HNP_SUPPORT    5       /* (otg) other RH port does */
 104 #define USB_DEVICE_DEBUG_MODE           6       /* (special devices only) */
 105
 106 #define USB_ENDPOINT_HALT               0       /* IN/OUT will STALL */
 107
 108
 109 /**
 110  * struct usb_ctrlrequest - SETUP data for a USB device control request
 111  * @bRequestType: matches the USB bmRequestType field
 112  * @bRequest: matches the USB bRequest field
 113  * @wValue: matches the USB wValue field (le16 byte order)
 114  * @wIndex: matches the USB wIndex field (le16 byte order)
 115  * @wLength: matches the USB wLength field (le16 byte order)
 116  *
 117  * This structure is used to send control requests to a USB device.  It matches
 118  * the different fields of the USB 2.0 Spec section 9.3, table 9-2.  See the
 119  * USB spec for a fuller description of the different fields, and what they are
 120  * used for.
 121  *
 122  * Note that the driver for any interface can issue control requests.
 123  * For most devices, interfaces don't coordinate with each other, so
 124  * such requests may be made at any time.
 125  */
 126 struct usb_ctrlrequest {
 127         __u8 bRequestType;
 128         __u8 bRequest;
 129         __le16 wValue;
 130         __le16 wIndex;
 131         __le16 wLength;
 132 } __attribute__ ((packed));
 133
 134 /*-------------------------------------------------------------------------*/
 135
 136 /*
 137  * STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or
 138  * (rarely) accepted by SET_DESCRIPTOR.
 139  *
 140  * Note that all multi-byte values here are encoded in little endian
 141  * byte order "on the wire".  But when exposed through Linux-USB APIs,
 142  * they've been converted to cpu byte order.
 143  */
 144
 145 /*
 146  * Descriptor types ... USB 2.0 spec table 9.5
 147  */
 148 #define USB_DT_DEVICE                   0x01
 149 #define USB_DT_CONFIG                   0x02
 150 #define USB_DT_STRING                   0x03
 151 #define USB_DT_INTERFACE                0x04
 152 #define USB_DT_ENDPOINT                 0x05
 153 #define USB_DT_DEVICE_QUALIFIER         0x06
 154 #define USB_DT_OTHER_SPEED_CONFIG       0x07
 155 #define USB_DT_INTERFACE_POWER          0x08
 156 /* these are from a minor usb 2.0 revision (ECN) */
 157 #define USB_DT_OTG                      0x09
 158 #define USB_DT_DEBUG                    0x0a
 159 #define USB_DT_INTERFACE_ASSOCIATION    0x0b
 160 /* these are from the Wireless USB spec */
 161 #define USB_DT_SECURITY                 0x0c
 162 #define USB_DT_KEY                      0x0d
 163 #define USB_DT_ENCRYPTION_TYPE          0x0e
 164 #define USB_DT_BOS                      0x0f
 165 #define USB_DT_DEVICE_CAPABILITY        0x10
 166 #define USB_DT_WIRELESS_ENDPOINT_COMP   0x11
 167 #define USB_DT_WIRE_ADAPTER             0x21
 168 #define USB_DT_RPIPE                    0x22
 169
 170 /* conventional codes for class-specific descriptors */
 171 #define USB_DT_CS_DEVICE                0x21
 172 #define USB_DT_CS_CONFIG                0x22
 173 #define USB_DT_CS_STRING                0x23
 174 #define USB_DT_CS_INTERFACE             0x24
 175 #define USB_DT_CS_ENDPOINT              0x25
 176
 177 /* All standard descriptors have these 2 fields at the beginning */
 178 struct usb_descriptor_header {
 179         __u8  bLength;
 180         __u8  bDescriptorType;
 181 } __attribute__ ((packed));
 182
 183
 184 /*-------------------------------------------------------------------------*/
 185
 186 /* USB_DT_DEVICE: Device descriptor */
 187 struct usb_device_descriptor {
 188         __u8  bLength;
 189         __u8  bDescriptorType;
 190
 191         __le16 bcdUSB;
 192         __u8  bDeviceClass;
 193         __u8  bDeviceSubClass;
 194         __u8  bDeviceProtocol;
 195         __u8  bMaxPacketSize0;
 196         __le16 idVendor;
 197         __le16 idProduct;
 198         __le16 bcdDevice;
 199         __u8  iManufacturer;
 200         __u8  iProduct;
 201         __u8  iSerialNumber;
 202         __u8  bNumConfigurations;
 203 } __attribute__ ((packed));
 204
 205 #define USB_DT_DEVICE_SIZE              18
 206
 207
 208 /*
 209  * Device and/or Interface Class codes
 210  * as found in bDeviceClass or bInterfaceClass
 211  * and defined by www.usb.org documents
 212  */
 213 #define USB_CLASS_PER_INTERFACE         0       /* for DeviceClass */
 214 #define USB_CLASS_AUDIO                 1
 215 #define USB_CLASS_COMM                  2
 216 #define USB_CLASS_HID                   3
 217 #define USB_CLASS_PHYSICAL              5
 218 #define USB_CLASS_STILL_IMAGE           6
 219 #define USB_CLASS_PRINTER               7
 220 #define USB_CLASS_MASS_STORAGE          8
 221 #define USB_CLASS_HUB                   9
 222 #define USB_CLASS_CDC_DATA              0x0a
 223 #define USB_CLASS_CSCID                 0x0b    /* chip+ smart card */
 224 #define USB_CLASS_CONTENT_SEC           0x0d    /* content security */
 225 #define USB_CLASS_VIDEO                 0x0e
 226 #define USB_CLASS_WIRELESS_CONTROLLER   0xe0
 227 #define USB_CLASS_APP_SPEC              0xfe
 228 #define USB_CLASS_VENDOR_SPEC           0xff
 229
 230 /*-------------------------------------------------------------------------*/
 231
 232 /* USB_DT_CONFIG: Configuration descriptor information.
 233  *
 234  * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
 235  * descriptor type is different.  Highspeed-capable devices can look
 236  * different depending on what speed they're currently running.  Only
 237  * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
 238  * descriptors.
 239  */
 240 struct usb_config_descriptor {
 241         __u8  bLength;
 242         __u8  bDescriptorType;
 243
 244         __le16 wTotalLength;
 245         __u8  bNumInterfaces;
 246         __u8  bConfigurationValue;
 247         __u8  iConfiguration;
 248         __u8  bmAttributes;
 249         __u8  bMaxPower;
 250 } __attribute__ ((packed));
 251
 252 #define USB_DT_CONFIG_SIZE              9
 253
 254 /* from config descriptor bmAttributes */
 255 #define USB_CONFIG_ATT_ONE              (1 << 7)        /* must be set */
 256 #define USB_CONFIG_ATT_SELFPOWER        (1 << 6)        /* self powered */
 257 #define USB_CONFIG_ATT_WAKEUP           (1 << 5)        /* can wakeup */
 258 #define USB_CONFIG_ATT_BATTERY          (1 << 4)        /* battery powered */
 259
 260 /*-------------------------------------------------------------------------*/
 261
 262 /* USB_DT_STRING: String descriptor */
 263 struct usb_string_descriptor {
 264         __u8  bLength;
 265         __u8  bDescriptorType;
 266
 267         __le16 wData[1];                /* UTF-16LE encoded */
 268 } __attribute__ ((packed));
 269
 270 /* note that "string" zero is special, it holds language codes that
 271  * the device supports, not Unicode characters.
 272  */
 273
 274 /*-------------------------------------------------------------------------*/
 275
 276 /* USB_DT_INTERFACE: Interface descriptor */
 277 struct usb_interface_descriptor {
 278         __u8  bLength;
 279         __u8  bDescriptorType;
 280
 281         __u8  bInterfaceNumber;
 282         __u8  bAlternateSetting;
 283         __u8  bNumEndpoints;
 284         __u8  bInterfaceClass;
 285         __u8  bInterfaceSubClass;
 286         __u8  bInterfaceProtocol;
 287         __u8  iInterface;
 288 } __attribute__ ((packed));
 289
 290 #define USB_DT_INTERFACE_SIZE           9
 291
 292 /*-------------------------------------------------------------------------*/
 293
 294 /* USB_DT_ENDPOINT: Endpoint descriptor */
 295 struct usb_endpoint_descriptor {
 296         __u8  bLength;
 297         __u8  bDescriptorType;
 298
 299         __u8  bEndpointAddress;
 300         __u8  bmAttributes;
 301         __le16 wMaxPacketSize;
 302         __u8  bInterval;
 303
 304         /* NOTE:  these two are _only_ in audio endpoints. */
 305         /* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */
 306         __u8  bRefresh;
 307         __u8  bSynchAddress;
 308 } __attribute__ ((packed));
 309
 310 #define USB_DT_ENDPOINT_SIZE            7
 311 #define USB_DT_ENDPOINT_AUDIO_SIZE      9       /* Audio extension */
 312
 313
 314 /*
 315  * Endpoints
 316  */
 317 #define USB_ENDPOINT_NUMBER_MASK        0x0f    /* in bEndpointAddress */
 318 #define USB_ENDPOINT_DIR_MASK           0x80
 319
 320 #define USB_ENDPOINT_XFERTYPE_MASK      0x03    /* in bmAttributes */
 321 #define USB_ENDPOINT_XFER_CONTROL       0
 322 #define USB_ENDPOINT_XFER_ISOC          1
 323 #define USB_ENDPOINT_XFER_BULK          2
 324 #define USB_ENDPOINT_XFER_INT           3
 325 #define USB_ENDPOINT_MAX_ADJUSTABLE     0x80
 326
 327
 328 /*-------------------------------------------------------------------------*/
 329
 330 /* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
 331 struct usb_qualifier_descriptor {
 332         __u8  bLength;
 333         __u8  bDescriptorType;
 334
 335         __le16 bcdUSB;
 336         __u8  bDeviceClass;
 337         __u8  bDeviceSubClass;
 338         __u8  bDeviceProtocol;
 339         __u8  bMaxPacketSize0;
 340         __u8  bNumConfigurations;
 341         __u8  bRESERVED;
 342 } __attribute__ ((packed));
 343
 344
 345 /*-------------------------------------------------------------------------*/
 346
 347 /* USB_DT_OTG (from OTG 1.0a supplement) */
 348 struct usb_otg_descriptor {
 349         __u8  bLength;
 350         __u8  bDescriptorType;
 351
 352         __u8  bmAttributes;     /* support for HNP, SRP, etc */
 353 } __attribute__ ((packed));
 354
 355 /* from usb_otg_descriptor.bmAttributes */
 356 #define USB_OTG_SRP             (1 << 0)
 357 #define USB_OTG_HNP             (1 << 1)        /* swap host/device roles */
 358
 359 /*-------------------------------------------------------------------------*/
 360
 361 /* USB_DT_DEBUG:  for special highspeed devices, replacing serial console */
 362 struct usb_debug_descriptor {
 363         __u8  bLength;
 364         __u8  bDescriptorType;
 365
 366         /* bulk endpoints with 8 byte maxpacket */
 367         __u8  bDebugInEndpoint;
 368         __u8  bDebugOutEndpoint;
 369 };
 370
 371 /*-------------------------------------------------------------------------*/
 372
 373 /* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
 374 struct usb_interface_assoc_descriptor {
 375         __u8  bLength;
 376         __u8  bDescriptorType;
 377
 378         __u8  bFirstInterface;
 379         __u8  bInterfaceCount;
 380         __u8  bFunctionClass;
 381         __u8  bFunctionSubClass;
 382         __u8  bFunctionProtocol;
 383         __u8  iFunction;
 384 } __attribute__ ((packed));
 385
 386
 387 /*-------------------------------------------------------------------------*/
 388
 389 /* USB_DT_SECURITY:  group of wireless security descriptors, including
 390  * encryption types available for setting up a CC/association.
 391  */
 392 struct usb_security_descriptor {
 393         __u8  bLength;
 394         __u8  bDescriptorType;
 395
 396         __le16 wTotalLength;
 397         __u8  bNumEncryptionTypes;
 398 };
 399
 400 /*-------------------------------------------------------------------------*/
 401
 402 /* USB_DT_KEY:  used with {GET,SET}_SECURITY_DATA; only public keys
 403  * may be retrieved.
 404  */
 405 struct usb_key_descriptor {
 406         __u8  bLength;
 407         __u8  bDescriptorType;
 408
 409         __u8  tTKID[3];
 410         __u8  bReserved;
 411         __u8  bKeyData[0];
 412 };
 413
 414 /*-------------------------------------------------------------------------*/
 415
 416 /* USB_DT_ENCRYPTION_TYPE:  bundled in DT_SECURITY groups */
 417 struct usb_encryption_descriptor {
 418         __u8  bLength;
 419         __u8  bDescriptorType;
 420
 421         __u8  bEncryptionType;
 422 #define USB_ENC_TYPE_UNSECURE           0
 423 #define USB_ENC_TYPE_WIRED              1       /* non-wireless mode */
 424 #define USB_ENC_TYPE_CCM_1              2       /* aes128/cbc session */
 425 #define USB_ENC_TYPE_RSA_1              3       /* rsa3072/sha1 auth */
 426         __u8  bEncryptionValue;         /* use in SET_ENCRYPTION */
 427         __u8  bAuthKeyIndex;
 428 };
 429
 430
 431 /*-------------------------------------------------------------------------*/
 432
 433 /* USB_DT_BOS:  group of wireless capabilities */
 434 struct usb_bos_descriptor {
 435         __u8  bLength;
 436         __u8  bDescriptorType;
 437
 438         __le16 wTotalLength;
 439         __u8  bNumDeviceCaps;
 440 };
 441
 442 /*-------------------------------------------------------------------------*/
 443
 444 /* USB_DT_DEVICE_CAPABILITY:  grouped with BOS */
 445 struct usb_dev_cap_header {
 446         __u8  bLength;
 447         __u8  bDescriptorType;
 448         __u8  bDevCapabilityType;
 449 };
 450
 451 #define USB_CAP_TYPE_WIRELESS_USB       1
 452
 453 struct usb_wireless_cap_descriptor {    /* Ultra Wide Band */
 454         __u8  bLength;
 455         __u8  bDescriptorType;
 456         __u8  bDevCapabilityType;
 457
 458         __u8  bmAttributes;
 459 #define USB_WIRELESS_P2P_DRD            (1 << 1)
 460 #define USB_WIRELESS_BEACON_MASK        (3 << 2)
 461 #define USB_WIRELESS_BEACON_SELF        (1 << 2)
 462 #define USB_WIRELESS_BEACON_DIRECTED    (2 << 2)
 463 #define USB_WIRELESS_BEACON_NONE        (3 << 2)
 464         __le16 wPHYRates;       /* bit rates, Mbps */
 465 #define USB_WIRELESS_PHY_53             (1 << 0)        /* always set */
 466 #define USB_WIRELESS_PHY_80             (1 << 1)
 467 #define USB_WIRELESS_PHY_107            (1 << 2)        /* always set */
 468 #define USB_WIRELESS_PHY_160            (1 << 3)
 469 #define USB_WIRELESS_PHY_200            (1 << 4)        /* always set */
 470 #define USB_WIRELESS_PHY_320            (1 << 5)
 471 #define USB_WIRELESS_PHY_400            (1 << 6)
 472 #define USB_WIRELESS_PHY_480            (1 << 7)
 473         __u8  bmTFITXPowerInfo; /* TFI power levels */
 474         __u8  bmFFITXPowerInfo; /* FFI power levels */
 475         __le16 bmBandGroup;
 476         __u8  bReserved;
 477 };
 478
 479 /*-------------------------------------------------------------------------*/
 480
 481 /* USB_DT_WIRELESS_ENDPOINT_COMP:  companion descriptor associated with
 482  * each endpoint descriptor for a wireless device
 483  */
 484 struct usb_wireless_ep_comp_descriptor {
 485         __u8  bLength;
 486         __u8  bDescriptorType;
 487
 488         __u8  bMaxBurst;
 489         __u8  bMaxSequence;
 490         __le16 wMaxStreamDelay;
 491         __le16 wOverTheAirPacketSize;
 492         __u8  bOverTheAirInterval;
 493         __u8  bmCompAttributes;
 494 #define USB_ENDPOINT_SWITCH_MASK        0x03    /* in bmCompAttributes */
 495 #define USB_ENDPOINT_SWITCH_NO          0
 496 #define USB_ENDPOINT_SWITCH_SWITCH      1
 497 #define USB_ENDPOINT_SWITCH_SCALE       2
 498 };
 499
 500 /*-------------------------------------------------------------------------*/
 501
 502 /* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless
 503  * host and a device for connection set up, mutual authentication, and
 504  * exchanging short lived session keys.  The handshake depends on a CC.
 505  */
 506 struct usb_handshake {
 507         __u8 bMessageNumber;
 508         __u8 bStatus;
 509         __u8 tTKID[3];
 510         __u8 bReserved;
 511         __u8 CDID[16];
 512         __u8 nonce[16];
 513         __u8 MIC[8];
 514 };
 515
 516 /*-------------------------------------------------------------------------*/
 517
 518 /* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).
 519  * A CC may also be set up using non-wireless secure channels (including
 520  * wired USB!), and some devices may support CCs with multiple hosts.
 521  */
 522 struct usb_connection_context {
 523         __u8 CHID[16];          /* persistent host id */
 524         __u8 CDID[16];          /* device id (unique w/in host context) */
 525         __u8 CK[16];            /* connection key */
 526 };
 527
 528 /*-------------------------------------------------------------------------*/
 529
 530 /* USB 2.0 defines three speeds, here's how Linux identifies them */
 531
 532 enum usb_device_speed {
 533         USB_SPEED_UNKNOWN = 0,                  /* enumerating */
 534         USB_SPEED_LOW, USB_SPEED_FULL,          /* usb 1.1 */
 535         USB_SPEED_HIGH,                         /* usb 2.0 */
 536         USB_SPEED_VARIABLE,                     /* wireless (usb 2.5) */
 537 };
 538
 539 enum usb_device_state {
 540         /* NOTATTACHED isn't in the USB spec, and this state acts
 541          * the same as ATTACHED ... but it's clearer this way.
 542          */
 543         USB_STATE_NOTATTACHED = 0,
 544
 545         /* chapter 9 and authentication (wireless) device states */
 546         USB_STATE_ATTACHED,
 547         USB_STATE_POWERED,                      /* wired */
 548         USB_STATE_UNAUTHENTICATED,              /* auth */
 549         USB_STATE_RECONNECTING,                 /* auth */
 550         USB_STATE_DEFAULT,                      /* limited function */
 551         USB_STATE_ADDRESS,
 552         USB_STATE_CONFIGURED,                   /* most functions */
 553
 554         USB_STATE_SUSPENDED
 555
 556         /* NOTE:  there are actually four different SUSPENDED
 557          * states, returning to POWERED, DEFAULT, ADDRESS, or
 558          * CONFIGURED respectively when SOF tokens flow again.
 559          */
 560 };
 561
 562 #endif  /* __LINUX_USB_CH9_H */