ch9.h 17 KB

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