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 */ 604