/usr/include/linux/usb/functionfs.h is in linux-libc-dev 4.9.144-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 | #ifndef __LINUX_FUNCTIONFS_H__
#define __LINUX_FUNCTIONFS_H__
#include <linux/types.h>
#include <linux/ioctl.h>
#include <linux/usb/ch9.h>
enum {
FUNCTIONFS_DESCRIPTORS_MAGIC = 1,
FUNCTIONFS_STRINGS_MAGIC = 2,
FUNCTIONFS_DESCRIPTORS_MAGIC_V2 = 3,
};
enum functionfs_flags {
FUNCTIONFS_HAS_FS_DESC = 1,
FUNCTIONFS_HAS_HS_DESC = 2,
FUNCTIONFS_HAS_SS_DESC = 4,
FUNCTIONFS_HAS_MS_OS_DESC = 8,
FUNCTIONFS_VIRTUAL_ADDR = 16,
FUNCTIONFS_EVENTFD = 32,
FUNCTIONFS_ALL_CTRL_RECIP = 64,
FUNCTIONFS_CONFIG0_SETUP = 128,
};
/* Descriptor of an non-audio endpoint */
struct usb_endpoint_descriptor_no_audio {
__u8 bLength;
__u8 bDescriptorType;
__u8 bEndpointAddress;
__u8 bmAttributes;
__le16 wMaxPacketSize;
__u8 bInterval;
} __attribute__((packed));
struct usb_functionfs_descs_head_v2 {
__le32 magic;
__le32 length;
__le32 flags;
/*
* __le32 fs_count, hs_count, fs_count; must be included manually in
* the structure taking flags into consideration.
*/
} __attribute__((packed));
/* Legacy format, deprecated as of 3.14. */
struct usb_functionfs_descs_head {
__le32 magic;
__le32 length;
__le32 fs_count;
__le32 hs_count;
} __attribute__((packed, deprecated));
/* MS OS Descriptor header */
struct usb_os_desc_header {
__u8 interface;
__le32 dwLength;
__le16 bcdVersion;
__le16 wIndex;
union {
struct {
__u8 bCount;
__u8 Reserved;
};
__le16 wCount;
};
} __attribute__((packed));
struct usb_ext_compat_desc {
__u8 bFirstInterfaceNumber;
__u8 Reserved1;
__u8 CompatibleID[8];
__u8 SubCompatibleID[8];
__u8 Reserved2[6];
};
struct usb_ext_prop_desc {
__le32 dwSize;
__le32 dwPropertyDataType;
__le16 wPropertyNameLength;
} __attribute__((packed));
/*
* Descriptors format:
*
* | off | name | type | description |
* |-----+-----------+--------------+--------------------------------------|
* | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC_V2 |
* | 4 | length | LE32 | length of the whole data chunk |
* | 8 | flags | LE32 | combination of functionfs_flags |
* | | fs_count | LE32 | number of full-speed descriptors |
* | | hs_count | LE32 | number of high-speed descriptors |
* | | ss_count | LE32 | number of super-speed descriptors |
* | | os_count | LE32 | number of MS OS descriptors |
* | | fs_descrs | Descriptor[] | list of full-speed descriptors |
* | | hs_descrs | Descriptor[] | list of high-speed descriptors |
* | | ss_descrs | Descriptor[] | list of super-speed descriptors |
* | | os_descrs | OSDesc[] | list of MS OS descriptors |
*
* Depending on which flags are set, various fields may be missing in the
* structure. Any flags that are not recognised cause the whole block to be
* rejected with -ENOSYS.
*
* Legacy descriptors format (deprecated as of 3.14):
*
* | off | name | type | description |
* |-----+-----------+--------------+--------------------------------------|
* | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC |
* | 4 | length | LE32 | length of the whole data chunk |
* | 8 | fs_count | LE32 | number of full-speed descriptors |
* | 12 | hs_count | LE32 | number of high-speed descriptors |
* | 16 | fs_descrs | Descriptor[] | list of full-speed descriptors |
* | | hs_descrs | Descriptor[] | list of high-speed descriptors |
*
* All numbers must be in little endian order.
*
* Descriptor[] is an array of valid USB descriptors which have the following
* format:
*
* | off | name | type | description |
* |-----+-----------------+------+--------------------------|
* | 0 | bLength | U8 | length of the descriptor |
* | 1 | bDescriptorType | U8 | descriptor type |
* | 2 | payload | | descriptor's payload |
*
* OSDesc[] is an array of valid MS OS Feature Descriptors which have one of
* the following formats:
*
* | off | name | type | description |
* |-----+-----------------+------+--------------------------|
* | 0 | inteface | U8 | related interface number |
* | 1 | dwLength | U32 | length of the descriptor |
* | 5 | bcdVersion | U16 | currently supported: 1 |
* | 7 | wIndex | U16 | currently supported: 4 |
* | 9 | bCount | U8 | number of ext. compat. |
* | 10 | Reserved | U8 | 0 |
* | 11 | ExtCompat[] | | list of ext. compat. d. |
*
* | off | name | type | description |
* |-----+-----------------+------+--------------------------|
* | 0 | inteface | U8 | related interface number |
* | 1 | dwLength | U32 | length of the descriptor |
* | 5 | bcdVersion | U16 | currently supported: 1 |
* | 7 | wIndex | U16 | currently supported: 5 |
* | 9 | wCount | U16 | number of ext. compat. |
* | 11 | ExtProp[] | | list of ext. prop. d. |
*
* ExtCompat[] is an array of valid Extended Compatiblity descriptors
* which have the following format:
*
* | off | name | type | description |
* |-----+-----------------------+------+-------------------------------------|
* | 0 | bFirstInterfaceNumber | U8 | index of the interface or of the 1st|
* | | | | interface in an IAD group |
* | 1 | Reserved | U8 | 0 |
* | 2 | CompatibleID | U8[8]| compatible ID string |
* | 10 | SubCompatibleID | U8[8]| subcompatible ID string |
* | 18 | Reserved | U8[6]| 0 |
*
* ExtProp[] is an array of valid Extended Properties descriptors
* which have the following format:
*
* | off | name | type | description |
* |-----+-----------------------+------+-------------------------------------|
* | 0 | dwSize | U32 | length of the descriptor |
* | 4 | dwPropertyDataType | U32 | 1..7 |
* | 8 | wPropertyNameLength | U16 | bPropertyName length (NL) |
* | 10 | bPropertyName |U8[NL]| name of this property |
* |10+NL| dwPropertyDataLength | U32 | bPropertyData length (DL) |
* |14+NL| bProperty |U8[DL]| payload of this property |
*/
struct usb_functionfs_strings_head {
__le32 magic;
__le32 length;
__le32 str_count;
__le32 lang_count;
} __attribute__((packed));
/*
* Strings format:
*
* | off | name | type | description |
* |-----+------------+-----------------------+----------------------------|
* | 0 | magic | LE32 | FUNCTIONFS_STRINGS_MAGIC |
* | 4 | length | LE32 | length of the data chunk |
* | 8 | str_count | LE32 | number of strings |
* | 12 | lang_count | LE32 | number of languages |
* | 16 | stringtab | StringTab[lang_count] | table of strings per lang |
*
* For each language there is one stringtab entry (ie. there are lang_count
* stringtab entires). Each StringTab has following format:
*
* | off | name | type | description |
* |-----+---------+-------------------+------------------------------------|
* | 0 | lang | LE16 | language code |
* | 2 | strings | String[str_count] | array of strings in given language |
*
* For each string there is one strings entry (ie. there are str_count
* string entries). Each String is a NUL terminated string encoded in
* UTF-8.
*/
/*
* Events are delivered on the ep0 file descriptor, when the user mode driver
* reads from this file descriptor after writing the descriptors. Don't
* stop polling this descriptor.
*/
enum usb_functionfs_event_type {
FUNCTIONFS_BIND,
FUNCTIONFS_UNBIND,
FUNCTIONFS_ENABLE,
FUNCTIONFS_DISABLE,
FUNCTIONFS_SETUP,
FUNCTIONFS_SUSPEND,
FUNCTIONFS_RESUME
};
/* NOTE: this structure must stay the same size and layout on
* both 32-bit and 64-bit kernels.
*/
struct usb_functionfs_event {
union {
/* SETUP: packet; DATA phase i/o precedes next event
*(setup.bmRequestType & USB_DIR_IN) flags direction */
struct usb_ctrlrequest setup;
} __attribute__((packed)) u;
/* enum usb_functionfs_event_type */
__u8 type;
__u8 _pad[3];
} __attribute__((packed));
/* Endpoint ioctls */
/* The same as in gadgetfs */
/* IN transfers may be reported to the gadget driver as complete
* when the fifo is loaded, before the host reads the data;
* OUT transfers may be reported to the host's "client" driver as
* complete when they're sitting in the FIFO unread.
* THIS returns how many bytes are "unclaimed" in the endpoint fifo
* (needed for precise fault handling, when the hardware allows it)
*/
#define FUNCTIONFS_FIFO_STATUS _IO('g', 1)
/* discards any unclaimed data in the fifo. */
#define FUNCTIONFS_FIFO_FLUSH _IO('g', 2)
/* resets endpoint halt+toggle; used to implement set_interface.
* some hardware (like pxa2xx) can't support this.
*/
#define FUNCTIONFS_CLEAR_HALT _IO('g', 3)
/* Specific for functionfs */
/*
* Returns reverse mapping of an interface. Called on EP0. If there
* is no such interface returns -EDOM. If function is not active
* returns -ENODEV.
*/
#define FUNCTIONFS_INTERFACE_REVMAP _IO('g', 128)
/*
* Returns real bEndpointAddress of an endpoint. If function is not
* active returns -ENODEV.
*/
#define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129)
/*
* Returns endpoint descriptor. If function is not active returns -ENODEV.
*/
#define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \
struct usb_endpoint_descriptor)
#endif /* __LINUX_FUNCTIONFS_H__ */
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