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
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.
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.
16 * There's also "Wireless USB", using low power short range radios for
17 * peripheral interconnection but otherwise building on the USB framework.
19 * Note all descriptors are declared '__attribute__((packed))' so that:
21 * [a] they never get padded, either internally (USB spec writers
22 * probably handled that) or externally;
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
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.
33 #ifndef __LINUX_USB_CH9_H
34 #define __LINUX_USB_CH9_H
36 #include <linux/types.h> /* __u8 etc */
38 /*-------------------------------------------------------------------------*/
40 /* CONTROL REQUEST SUPPORT */
45 * This bit flag is used in endpoint descriptors' bEndpointAddress field.
46 * It's also one of three fields in control requests bRequestType.
48 #define USB_DIR_OUT 0 /* to device */
49 #define USB_DIR_IN 0x80 /* to host */
52 * USB types, the second of three bRequestType fields
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)
61 * USB recipients, the third of three bRequestType fields
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
73 * Standard requests, for the bRequest field of a SETUP packet.
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.
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
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
106 * USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and
107 * are read as a bit array returned by USB_REQ_GET_STATUS. (So there
108 * are at most sixteen features of each type.)
110 #define USB_DEVICE_SELF_POWERED 0 /* (read only) */
111 #define USB_DEVICE_REMOTE_WAKEUP 1 /* dev may initiate wakeup */
112 #define USB_DEVICE_TEST_MODE 2 /* (wired high speed only) */
113 #define USB_DEVICE_BATTERY 2 /* (wireless) */
114 #define USB_DEVICE_B_HNP_ENABLE 3 /* (otg) dev may initiate HNP */
115 #define USB_DEVICE_WUSB_DEVICE 3 /* (wireless)*/
116 #define USB_DEVICE_A_HNP_SUPPORT 4 /* (otg) RH port supports HNP */
117 #define USB_DEVICE_A_ALT_HNP_SUPPORT 5 /* (otg) other RH port does */
118 #define USB_DEVICE_DEBUG_MODE 6 /* (special devices only) */
120 #define USB_ENDPOINT_HALT 0 /* IN/OUT will STALL */
124 * struct usb_ctrlrequest - SETUP data for a USB device control request
125 * @bRequestType: matches the USB bmRequestType field
126 * @bRequest: matches the USB bRequest field
127 * @wValue: matches the USB wValue field (le16 byte order)
128 * @wIndex: matches the USB wIndex field (le16 byte order)
129 * @wLength: matches the USB wLength field (le16 byte order)
131 * This structure is used to send control requests to a USB device. It matches
132 * the different fields of the USB 2.0 Spec section 9.3, table 9-2. See the
133 * USB spec for a fuller description of the different fields, and what they are
136 * Note that the driver for any interface can issue control requests.
137 * For most devices, interfaces don't coordinate with each other, so
138 * such requests may be made at any time.
140 struct usb_ctrlrequest {
146 } __attribute__ ((packed));
148 /*-------------------------------------------------------------------------*/
151 * STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or
152 * (rarely) accepted by SET_DESCRIPTOR.
154 * Note that all multi-byte values here are encoded in little endian
155 * byte order "on the wire". But when exposed through Linux-USB APIs,
156 * they've been converted to cpu byte order.
160 * Descriptor types ... USB 2.0 spec table 9.5
162 #define USB_DT_DEVICE 0x01
163 #define USB_DT_CONFIG 0x02
164 #define USB_DT_STRING 0x03
165 #define USB_DT_INTERFACE 0x04
166 #define USB_DT_ENDPOINT 0x05
167 #define USB_DT_DEVICE_QUALIFIER 0x06
168 #define USB_DT_OTHER_SPEED_CONFIG 0x07
169 #define USB_DT_INTERFACE_POWER 0x08
170 /* these are from a minor usb 2.0 revision (ECN) */
171 #define USB_DT_OTG 0x09
172 #define USB_DT_DEBUG 0x0a
173 #define USB_DT_INTERFACE_ASSOCIATION 0x0b
174 /* these are from the Wireless USB spec */
175 #define USB_DT_SECURITY 0x0c
176 #define USB_DT_KEY 0x0d
177 #define USB_DT_ENCRYPTION_TYPE 0x0e
178 #define USB_DT_BOS 0x0f
179 #define USB_DT_DEVICE_CAPABILITY 0x10
180 #define USB_DT_WIRELESS_ENDPOINT_COMP 0x11
181 #define USB_DT_WIRE_ADAPTER 0x21
182 #define USB_DT_RPIPE 0x22
184 /* Conventional codes for class-specific descriptors. The convention is
185 * defined in the USB "Common Class" Spec (3.11). Individual class specs
186 * are authoritative for their usage, not the "common class" writeup.
188 #define USB_DT_CS_DEVICE (USB_TYPE_CLASS | USB_DT_DEVICE)
189 #define USB_DT_CS_CONFIG (USB_TYPE_CLASS | USB_DT_CONFIG)
190 #define USB_DT_CS_STRING (USB_TYPE_CLASS | USB_DT_STRING)
191 #define USB_DT_CS_INTERFACE (USB_TYPE_CLASS | USB_DT_INTERFACE)
192 #define USB_DT_CS_ENDPOINT (USB_TYPE_CLASS | USB_DT_ENDPOINT)
194 /* All standard descriptors have these 2 fields at the beginning */
195 struct usb_descriptor_header {
197 __u8 bDescriptorType;
198 } __attribute__ ((packed));
201 /*-------------------------------------------------------------------------*/
203 /* USB_DT_DEVICE: Device descriptor */
204 struct usb_device_descriptor {
206 __u8 bDescriptorType;
210 __u8 bDeviceSubClass;
211 __u8 bDeviceProtocol;
212 __u8 bMaxPacketSize0;
219 __u8 bNumConfigurations;
220 } __attribute__ ((packed));
222 #define USB_DT_DEVICE_SIZE 18
226 * Device and/or Interface Class codes
227 * as found in bDeviceClass or bInterfaceClass
228 * and defined by www.usb.org documents
230 #define USB_CLASS_PER_INTERFACE 0 /* for DeviceClass */
231 #define USB_CLASS_AUDIO 1
232 #define USB_CLASS_COMM 2
233 #define USB_CLASS_HID 3
234 #define USB_CLASS_PHYSICAL 5
235 #define USB_CLASS_STILL_IMAGE 6
236 #define USB_CLASS_PRINTER 7
237 #define USB_CLASS_MASS_STORAGE 8
238 #define USB_CLASS_HUB 9
239 #define USB_CLASS_CDC_DATA 0x0a
240 #define USB_CLASS_CSCID 0x0b /* chip+ smart card */
241 #define USB_CLASS_CONTENT_SEC 0x0d /* content security */
242 #define USB_CLASS_VIDEO 0x0e
243 #define USB_CLASS_WIRELESS_CONTROLLER 0xe0
244 #define USB_CLASS_MISC 0xef
245 #define USB_CLASS_APP_SPEC 0xfe
246 #define USB_CLASS_VENDOR_SPEC 0xff
248 /*-------------------------------------------------------------------------*/
250 /* USB_DT_CONFIG: Configuration descriptor information.
252 * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
253 * descriptor type is different. Highspeed-capable devices can look
254 * different depending on what speed they're currently running. Only
255 * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
258 struct usb_config_descriptor {
260 __u8 bDescriptorType;
264 __u8 bConfigurationValue;
268 } __attribute__ ((packed));
270 #define USB_DT_CONFIG_SIZE 9
272 /* from config descriptor bmAttributes */
273 #define USB_CONFIG_ATT_ONE (1 << 7) /* must be set */
274 #define USB_CONFIG_ATT_SELFPOWER (1 << 6) /* self powered */
275 #define USB_CONFIG_ATT_WAKEUP (1 << 5) /* can wakeup */
276 #define USB_CONFIG_ATT_BATTERY (1 << 4) /* battery powered */
278 /*-------------------------------------------------------------------------*/
280 /* USB_DT_STRING: String descriptor */
281 struct usb_string_descriptor {
283 __u8 bDescriptorType;
285 __le16 wData[1]; /* UTF-16LE encoded */
286 } __attribute__ ((packed));
288 /* note that "string" zero is special, it holds language codes that
289 * the device supports, not Unicode characters.
292 /*-------------------------------------------------------------------------*/
294 /* USB_DT_INTERFACE: Interface descriptor */
295 struct usb_interface_descriptor {
297 __u8 bDescriptorType;
299 __u8 bInterfaceNumber;
300 __u8 bAlternateSetting;
302 __u8 bInterfaceClass;
303 __u8 bInterfaceSubClass;
304 __u8 bInterfaceProtocol;
306 } __attribute__ ((packed));
308 #define USB_DT_INTERFACE_SIZE 9
310 /*-------------------------------------------------------------------------*/
312 /* USB_DT_ENDPOINT: Endpoint descriptor */
313 struct usb_endpoint_descriptor {
315 __u8 bDescriptorType;
317 __u8 bEndpointAddress;
319 __le16 wMaxPacketSize;
322 /* NOTE: these two are _only_ in audio endpoints. */
323 /* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */
326 } __attribute__ ((packed));
328 #define USB_DT_ENDPOINT_SIZE 7
329 #define USB_DT_ENDPOINT_AUDIO_SIZE 9 /* Audio extension */
335 #define USB_ENDPOINT_NUMBER_MASK 0x0f /* in bEndpointAddress */
336 #define USB_ENDPOINT_DIR_MASK 0x80
338 #define USB_ENDPOINT_XFERTYPE_MASK 0x03 /* in bmAttributes */
339 #define USB_ENDPOINT_XFER_CONTROL 0
340 #define USB_ENDPOINT_XFER_ISOC 1
341 #define USB_ENDPOINT_XFER_BULK 2
342 #define USB_ENDPOINT_XFER_INT 3
343 #define USB_ENDPOINT_MAX_ADJUSTABLE 0x80
346 /*-------------------------------------------------------------------------*/
348 /* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
349 struct usb_qualifier_descriptor {
351 __u8 bDescriptorType;
355 __u8 bDeviceSubClass;
356 __u8 bDeviceProtocol;
357 __u8 bMaxPacketSize0;
358 __u8 bNumConfigurations;
360 } __attribute__ ((packed));
363 /*-------------------------------------------------------------------------*/
365 /* USB_DT_OTG (from OTG 1.0a supplement) */
366 struct usb_otg_descriptor {
368 __u8 bDescriptorType;
370 __u8 bmAttributes; /* support for HNP, SRP, etc */
371 } __attribute__ ((packed));
373 /* from usb_otg_descriptor.bmAttributes */
374 #define USB_OTG_SRP (1 << 0)
375 #define USB_OTG_HNP (1 << 1) /* swap host/device roles */
377 /*-------------------------------------------------------------------------*/
379 /* USB_DT_DEBUG: for special highspeed devices, replacing serial console */
380 struct usb_debug_descriptor {
382 __u8 bDescriptorType;
384 /* bulk endpoints with 8 byte maxpacket */
385 __u8 bDebugInEndpoint;
386 __u8 bDebugOutEndpoint;
387 } __attribute__((packed));
389 /*-------------------------------------------------------------------------*/
391 /* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
392 struct usb_interface_assoc_descriptor {
394 __u8 bDescriptorType;
396 __u8 bFirstInterface;
397 __u8 bInterfaceCount;
399 __u8 bFunctionSubClass;
400 __u8 bFunctionProtocol;
402 } __attribute__ ((packed));
405 /*-------------------------------------------------------------------------*/
407 /* USB_DT_SECURITY: group of wireless security descriptors, including
408 * encryption types available for setting up a CC/association.
410 struct usb_security_descriptor {
412 __u8 bDescriptorType;
415 __u8 bNumEncryptionTypes;
416 } __attribute__((packed));
418 /*-------------------------------------------------------------------------*/
420 /* USB_DT_KEY: used with {GET,SET}_SECURITY_DATA; only public keys
423 struct usb_key_descriptor {
425 __u8 bDescriptorType;
430 } __attribute__((packed));
432 /*-------------------------------------------------------------------------*/
434 /* USB_DT_ENCRYPTION_TYPE: bundled in DT_SECURITY groups */
435 struct usb_encryption_descriptor {
437 __u8 bDescriptorType;
439 __u8 bEncryptionType;
440 #define USB_ENC_TYPE_UNSECURE 0
441 #define USB_ENC_TYPE_WIRED 1 /* non-wireless mode */
442 #define USB_ENC_TYPE_CCM_1 2 /* aes128/cbc session */
443 #define USB_ENC_TYPE_RSA_1 3 /* rsa3072/sha1 auth */
444 __u8 bEncryptionValue; /* use in SET_ENCRYPTION */
446 } __attribute__((packed));
449 /*-------------------------------------------------------------------------*/
451 /* USB_DT_BOS: group of wireless capabilities */
452 struct usb_bos_descriptor {
454 __u8 bDescriptorType;
458 } __attribute__((packed));
460 /*-------------------------------------------------------------------------*/
462 /* USB_DT_DEVICE_CAPABILITY: grouped with BOS */
463 struct usb_dev_cap_header {
465 __u8 bDescriptorType;
466 __u8 bDevCapabilityType;
467 } __attribute__((packed));
469 #define USB_CAP_TYPE_WIRELESS_USB 1
471 struct usb_wireless_cap_descriptor { /* Ultra Wide Band */
473 __u8 bDescriptorType;
474 __u8 bDevCapabilityType;
477 #define USB_WIRELESS_P2P_DRD (1 << 1)
478 #define USB_WIRELESS_BEACON_MASK (3 << 2)
479 #define USB_WIRELESS_BEACON_SELF (1 << 2)
480 #define USB_WIRELESS_BEACON_DIRECTED (2 << 2)
481 #define USB_WIRELESS_BEACON_NONE (3 << 2)
482 __le16 wPHYRates; /* bit rates, Mbps */
483 #define USB_WIRELESS_PHY_53 (1 << 0) /* always set */
484 #define USB_WIRELESS_PHY_80 (1 << 1)
485 #define USB_WIRELESS_PHY_107 (1 << 2) /* always set */
486 #define USB_WIRELESS_PHY_160 (1 << 3)
487 #define USB_WIRELESS_PHY_200 (1 << 4) /* always set */
488 #define USB_WIRELESS_PHY_320 (1 << 5)
489 #define USB_WIRELESS_PHY_400 (1 << 6)
490 #define USB_WIRELESS_PHY_480 (1 << 7)
491 __u8 bmTFITXPowerInfo; /* TFI power levels */
492 __u8 bmFFITXPowerInfo; /* FFI power levels */
495 } __attribute__((packed));
497 /*-------------------------------------------------------------------------*/
499 /* USB_DT_WIRELESS_ENDPOINT_COMP: companion descriptor associated with
500 * each endpoint descriptor for a wireless device
502 struct usb_wireless_ep_comp_descriptor {
504 __u8 bDescriptorType;
508 __le16 wMaxStreamDelay;
509 __le16 wOverTheAirPacketSize;
510 __u8 bOverTheAirInterval;
511 __u8 bmCompAttributes;
512 #define USB_ENDPOINT_SWITCH_MASK 0x03 /* in bmCompAttributes */
513 #define USB_ENDPOINT_SWITCH_NO 0
514 #define USB_ENDPOINT_SWITCH_SWITCH 1
515 #define USB_ENDPOINT_SWITCH_SCALE 2
516 } __attribute__((packed));
518 /*-------------------------------------------------------------------------*/
520 /* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless
521 * host and a device for connection set up, mutual authentication, and
522 * exchanging short lived session keys. The handshake depends on a CC.
524 struct usb_handshake {
532 } __attribute__((packed));
534 /*-------------------------------------------------------------------------*/
536 /* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).
537 * A CC may also be set up using non-wireless secure channels (including
538 * wired USB!), and some devices may support CCs with multiple hosts.
540 struct usb_connection_context {
541 __u8 CHID[16]; /* persistent host id */
542 __u8 CDID[16]; /* device id (unique w/in host context) */
543 __u8 CK[16]; /* connection key */
544 } __attribute__((packed));
546 /*-------------------------------------------------------------------------*/
548 /* USB 2.0 defines three speeds, here's how Linux identifies them */
550 enum usb_device_speed {
551 USB_SPEED_UNKNOWN = 0, /* enumerating */
552 USB_SPEED_LOW, USB_SPEED_FULL, /* usb 1.1 */
553 USB_SPEED_HIGH, /* usb 2.0 */
554 USB_SPEED_VARIABLE, /* wireless (usb 2.5) */
557 enum usb_device_state {
558 /* NOTATTACHED isn't in the USB spec, and this state acts
559 * the same as ATTACHED ... but it's clearer this way.
561 USB_STATE_NOTATTACHED = 0,
563 /* chapter 9 and authentication (wireless) device states */
565 USB_STATE_POWERED, /* wired */
566 USB_STATE_UNAUTHENTICATED, /* auth */
567 USB_STATE_RECONNECTING, /* auth */
568 USB_STATE_DEFAULT, /* limited function */
570 USB_STATE_CONFIGURED, /* most functions */
574 /* NOTE: there are actually four different SUSPENDED
575 * states, returning to POWERED, DEFAULT, ADDRESS, or
576 * CONFIGURED respectively when SOF tokens flow again.
580 #endif /* __LINUX_USB_CH9_H */