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  * - (eventually) a Linux "gadget" slave/device 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 will benefit from working well together.
  14  */
  15
  16 #ifndef __LINUX_USB_CH9_H
  17 #define __LINUX_USB_CH9_H
  18
  19 #include <asm/types.h>          /* __u8 etc */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /* CONTROL REQUEST SUPPORT */
  24
  25 /*
  26  * USB directions
  27  *
  28  * This bit flag is used in endpoint descriptors' bEndpointAddress field.
  29  * It's also one of three fields in control requests bRequestType.
  30  */
  31 #define USB_DIR_OUT                     0               /* to device */
  32 #define USB_DIR_IN                      0x80            /* to host */
  33
  34 /*
  35  * USB types, the second of three bRequestType fields
  36  */
  37 #define USB_TYPE_MASK                   (0x03 << 5)
  38 #define USB_TYPE_STANDARD               (0x00 << 5)
  39 #define USB_TYPE_CLASS                  (0x01 << 5)
  40 #define USB_TYPE_VENDOR                 (0x02 << 5)
  41 #define USB_TYPE_RESERVED               (0x03 << 5)
  42
  43 /*
  44  * USB recipients, the third of three bRequestType fields
  45  */
  46 #define USB_RECIP_MASK                  0x1f
  47 #define USB_RECIP_DEVICE                0x00
  48 #define USB_RECIP_INTERFACE             0x01
  49 #define USB_RECIP_ENDPOINT              0x02
  50 #define USB_RECIP_OTHER                 0x03
  51
  52 /*
  53  * Standard requests, for the bRequest field of a SETUP packet.
  54  *
  55  * These are qualified by the bRequestType field, so that for example
  56  * TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved
  57  * by a GET_STATUS request.
  58  */
  59 #define USB_REQ_GET_STATUS              0x00
  60 #define USB_REQ_CLEAR_FEATURE           0x01
  61 #define USB_REQ_SET_FEATURE             0x03
  62 #define USB_REQ_SET_ADDRESS             0x05
  63 #define USB_REQ_GET_DESCRIPTOR          0x06
  64 #define USB_REQ_SET_DESCRIPTOR          0x07
  65 #define USB_REQ_GET_CONFIGURATION       0x08
  66 #define USB_REQ_SET_CONFIGURATION       0x09
  67 #define USB_REQ_GET_INTERFACE           0x0A
  68 #define USB_REQ_SET_INTERFACE           0x0B
  69 #define USB_REQ_SYNCH_FRAME             0x0C
  70
  71 /*
  72  * USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and
  73  * are read as a bit array returned by USB_REQ_GET_STATUS.  (So there
  74  * are at most sixteen features of each type.)
  75  */
  76 #define USB_DEVICE_SELF_POWERED         0       /* (read only) */
  77 #define USB_DEVICE_REMOTE_WAKEUP        1       /* dev may initiate wakeup */
  78 #define USB_DEVICE_TEST_MODE            2       /* (high speed only) */
  79 #define USB_DEVICE_B_HNP_ENABLE         3       /* dev may initiate HNP */
  80 #define USB_DEVICE_A_HNP_SUPPORT        4       /* RH port supports HNP */
  81 #define USB_DEVICE_A_ALT_HNP_SUPPORT    5       /* other RH port does */
  82
  83 #define USB_ENDPOINT_HALT               0       /* IN/OUT will STALL */
  84
  85
  86 /**
  87  * struct usb_ctrlrequest - SETUP data for a USB device control request
  88  * @bRequestType: matches the USB bmRequestType field
  89  * @bRequest: matches the USB bRequest field
  90  * @wValue: matches the USB wValue field (le16 byte order)
  91  * @wIndex: matches the USB wIndex field (le16 byte order)
  92  * @wLength: matches the USB wLength field (le16 byte order)
  93  *
  94  * This structure is used to send control requests to a USB device.  It matches
  95  * the different fields of the USB 2.0 Spec section 9.3, table 9-2.  See the
  96  * USB spec for a fuller description of the different fields, and what they are
  97  * used for.
  98  *
  99  * Note that the driver for any interface can issue control requests.
 100  * For most devices, interfaces don't coordinate with each other, so
 101  * such requests may be made at any time.
 102  */
 103 struct usb_ctrlrequest {
 104         __u8 bRequestType;
 105         __u8 bRequest;
 106         __u16 wValue;
 107         __u16 wIndex;
 108         __u16 wLength;
 109 } __attribute__ ((packed));
 110
 111 /*-------------------------------------------------------------------------*/
 112
 113 /*
 114  * STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or
 115  * (rarely) accepted by SET_DESCRIPTOR.
 116  *
 117  * Note that all multi-byte values here are encoded in little endian
 118  * byte order "on the wire".  But when exposed through Linux-USB APIs,
 119  * they've been converted to cpu byte order.
 120  */
 121
 122 /*
 123  * Descriptor types ... USB 2.0 spec table 9.5
 124  */
 125 #define USB_DT_DEVICE                   0x01
 126 #define USB_DT_CONFIG                   0x02
 127 #define USB_DT_STRING                   0x03
 128 #define USB_DT_INTERFACE                0x04
 129 #define USB_DT_ENDPOINT                 0x05
 130 #define USB_DT_DEVICE_QUALIFIER         0x06
 131 #define USB_DT_OTHER_SPEED_CONFIG       0x07
 132 #define USB_DT_INTERFACE_POWER          0x08
 133 /* these are from a minor usb 2.0 revision (ECN) */
 134 #define USB_DT_OTG                      0x09
 135 #define USB_DT_DEBUG                    0x0a
 136 #define USB_DT_INTERFACE_ASSOCIATION    0x0b
 137
 138 /* conventional codes for class-specific descriptors */
 139 #define USB_DT_CS_DEVICE                0x21
 140 #define USB_DT_CS_CONFIG                0x22
 141 #define USB_DT_CS_STRING                0x23
 142 #define USB_DT_CS_INTERFACE             0x24
 143 #define USB_DT_CS_ENDPOINT              0x25
 144
 145 /* All standard descriptors have these 2 fields at the beginning */
 146 struct usb_descriptor_header {
 147         __u8  bLength;
 148         __u8  bDescriptorType;
 149 } __attribute__ ((packed));
 150
 151
 152 /*-------------------------------------------------------------------------*/
 153
 154 /* USB_DT_DEVICE: Device descriptor */
 155 struct usb_device_descriptor {
 156         __u8  bLength;
 157         __u8  bDescriptorType;
 158
 159         __u16 bcdUSB;
 160         __u8  bDeviceClass;
 161         __u8  bDeviceSubClass;
 162         __u8  bDeviceProtocol;
 163         __u8  bMaxPacketSize0;
 164         __u16 idVendor;
 165         __u16 idProduct;
 166         __u16 bcdDevice;
 167         __u8  iManufacturer;
 168         __u8  iProduct;
 169         __u8  iSerialNumber;
 170         __u8  bNumConfigurations;
 171 } __attribute__ ((packed));
 172
 173 #define USB_DT_DEVICE_SIZE              18
 174
 175
 176 /*
 177  * Device and/or Interface Class codes
 178  * as found in bDeviceClass or bInterfaceClass
 179  * and defined by www.usb.org documents
 180  */
 181 #define USB_CLASS_PER_INTERFACE         0       /* for DeviceClass */
 182 #define USB_CLASS_AUDIO                 1
 183 #define USB_CLASS_COMM                  2
 184 #define USB_CLASS_HID                   3
 185 #define USB_CLASS_PHYSICAL              5
 186 #define USB_CLASS_STILL_IMAGE           6
 187 #define USB_CLASS_PRINTER               7
 188 #define USB_CLASS_MASS_STORAGE          8
 189 #define USB_CLASS_HUB                   9
 190 #define USB_CLASS_CDC_DATA              0x0a
 191 #define USB_CLASS_CSCID                 0x0b    /* chip+ smart card */
 192 #define USB_CLASS_CONTENT_SEC           0x0d    /* content security */
 193 #define USB_CLASS_VIDEO                 0x0e
 194 #define USB_CLASS_APP_SPEC              0xfe
 195 #define USB_CLASS_VENDOR_SPEC           0xff
 196
 197 /*-------------------------------------------------------------------------*/
 198
 199 /* USB_DT_CONFIG: Configuration descriptor information.
 200  *
 201  * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
 202  * descriptor type is different.  Highspeed-capable devices can look
 203  * different depending on what speed they're currently running.  Only
 204  * devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
 205  * descriptors.
 206  */
 207 struct usb_config_descriptor {
 208         __u8  bLength;
 209         __u8  bDescriptorType;
 210
 211         __u16 wTotalLength;
 212         __u8  bNumInterfaces;
 213         __u8  bConfigurationValue;
 214         __u8  iConfiguration;
 215         __u8  bmAttributes;
 216         __u8  bMaxPower;
 217 } __attribute__ ((packed));
 218
 219 #define USB_DT_CONFIG_SIZE              9
 220
 221 /* from config descriptor bmAttributes */
 222 #define USB_CONFIG_ATT_ONE              (1 << 7)        /* must be set */
 223 #define USB_CONFIG_ATT_SELFPOWER        (1 << 6)        /* self powered */
 224 #define USB_CONFIG_ATT_WAKEUP           (1 << 5)        /* can wakeup */
 225
 226 /*-------------------------------------------------------------------------*/
 227
 228 /* USB_DT_STRING: String descriptor */
 229 struct usb_string_descriptor {
 230         __u8  bLength;
 231         __u8  bDescriptorType;
 232
 233         __u16 wData[1];         /* UTF-16LE encoded */
 234 } __attribute__ ((packed));
 235
 236 /* note that "string" zero is special, it holds language codes that
 237  * the device supports, not Unicode characters.
 238  */
 239
 240 /*-------------------------------------------------------------------------*/
 241
 242 /* USB_DT_INTERFACE: Interface descriptor */
 243 struct usb_interface_descriptor {
 244         __u8  bLength;
 245         __u8  bDescriptorType;
 246
 247         __u8  bInterfaceNumber;
 248         __u8  bAlternateSetting;
 249         __u8  bNumEndpoints;
 250         __u8  bInterfaceClass;
 251         __u8  bInterfaceSubClass;
 252         __u8  bInterfaceProtocol;
 253         __u8  iInterface;
 254 } __attribute__ ((packed));
 255
 256 #define USB_DT_INTERFACE_SIZE           9
 257
 258 /*-------------------------------------------------------------------------*/
 259
 260 /* USB_DT_ENDPOINT: Endpoint descriptor */
 261 struct usb_endpoint_descriptor {
 262         __u8  bLength;
 263         __u8  bDescriptorType;
 264
 265         __u8  bEndpointAddress;
 266         __u8  bmAttributes;
 267         __u16 wMaxPacketSize;
 268         __u8  bInterval;
 269
 270         // NOTE:  these two are _only_ in audio endpoints.
 271         // use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof.
 272         __u8  bRefresh;
 273         __u8  bSynchAddress;
 274 } __attribute__ ((packed));
 275
 276 #define USB_DT_ENDPOINT_SIZE            7
 277 #define USB_DT_ENDPOINT_AUDIO_SIZE      9       /* Audio extension */
 278
 279
 280 /*
 281  * Endpoints
 282  */
 283 #define USB_ENDPOINT_NUMBER_MASK        0x0f    /* in bEndpointAddress */
 284 #define USB_ENDPOINT_DIR_MASK           0x80
 285
 286 #define USB_ENDPOINT_XFERTYPE_MASK      0x03    /* in bmAttributes */
 287 #define USB_ENDPOINT_XFER_CONTROL       0
 288 #define USB_ENDPOINT_XFER_ISOC          1
 289 #define USB_ENDPOINT_XFER_BULK          2
 290 #define USB_ENDPOINT_XFER_INT           3
 291
 292
 293 /*-------------------------------------------------------------------------*/
 294
 295 /* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
 296 struct usb_qualifier_descriptor {
 297         __u8  bLength;
 298         __u8  bDescriptorType;
 299
 300         __u16 bcdUSB;
 301         __u8  bDeviceClass;
 302         __u8  bDeviceSubClass;
 303         __u8  bDeviceProtocol;
 304         __u8  bMaxPacketSize0;
 305         __u8  bNumConfigurations;
 306         __u8  bRESERVED;
 307 } __attribute__ ((packed));
 308
 309
 310 /*-------------------------------------------------------------------------*/
 311
 312 /* USB_DT_OTG (from OTG 1.0a supplement) */
 313 struct usb_otg_descriptor {
 314         __u8  bLength;
 315         __u8  bDescriptorType;
 316
 317         __u8  bmAttributes;     /* support for HNP, SRP, etc */
 318 } __attribute__ ((packed));
 319
 320 /* from usb_otg_descriptor.bmAttributes */
 321 #define USB_OTG_SRP             (1 << 0)
 322 #define USB_OTG_HNP             (1 << 1)        /* swap host/device roles */
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
 327 struct usb_interface_assoc_descriptor {
 328         __u8  bLength;
 329         __u8  bDescriptorType;
 330
 331         __u8  bFirstInterface;
 332         __u8  bInterfaceCount;
 333         __u8  bFunctionClass;
 334         __u8  bFunctionSubClass;
 335         __u8  bFunctionProtocol;
 336         __u8  iFunction;
 337 } __attribute__ ((packed));
 338
 339
 340 /*-------------------------------------------------------------------------*/
 341
 342 /* USB 2.0 defines three speeds, here's how Linux identifies them */
 343
 344 enum usb_device_speed {
 345         USB_SPEED_UNKNOWN = 0,                  /* enumerating */
 346         USB_SPEED_LOW, USB_SPEED_FULL,          /* usb 1.1 */
 347         USB_SPEED_HIGH                          /* usb 2.0 */
 348 };
 349
 350 enum usb_device_state {
 351         /* NOTATTACHED isn't in the USB spec, and this state acts
 352          * the same as ATTACHED ... but it's clearer this way.
 353          */
 354         USB_STATE_NOTATTACHED = 0,
 355
 356         /* the chapter 9 device states */
 357         USB_STATE_ATTACHED,
 358         USB_STATE_POWERED,
 359         USB_STATE_DEFAULT,                      /* limited function */
 360         USB_STATE_ADDRESS,
 361         USB_STATE_CONFIGURED,                   /* most functions */
 362
 363         USB_STATE_SUSPENDED
 364
 365         /* NOTE:  there are actually four different SUSPENDED
 366          * states, returning to POWERED, DEFAULT, ADDRESS, or
 367          * CONFIGURED respectively when SOF tokens flow again.
 368          */
 369 };
 370
 371 #endif  /* __LINUX_USB_CH9_H */