1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _UAPI__LINUX_FUNCTIONFS_H__ 3 #define _UAPI__LINUX_FUNCTIONFS_H__ 4 5 6 #include <linux/types.h> 7 #include <linux/ioctl.h> 8 9 #include <linux/usb/ch9.h> 10 11 12 enum { 13 FUNCTIONFS_DESCRIPTORS_MAGIC = 1, 14 FUNCTIONFS_STRINGS_MAGIC = 2, 15 FUNCTIONFS_DESCRIPTORS_MAGIC_V2 = 3, 16 }; 17 18 enum functionfs_flags { 19 FUNCTIONFS_HAS_FS_DESC = 1, 20 FUNCTIONFS_HAS_HS_DESC = 2, 21 FUNCTIONFS_HAS_SS_DESC = 4, 22 FUNCTIONFS_HAS_MS_OS_DESC = 8, 23 FUNCTIONFS_VIRTUAL_ADDR = 16, 24 FUNCTIONFS_EVENTFD = 32, 25 FUNCTIONFS_ALL_CTRL_RECIP = 64, 26 FUNCTIONFS_CONFIG0_SETUP = 128, 27 }; 28 29 /* Descriptor of an non-audio endpoint */ 30 struct usb_endpoint_descriptor_no_audio { 31 __u8 bLength; 32 __u8 bDescriptorType; 33 34 __u8 bEndpointAddress; 35 __u8 bmAttributes; 36 __le16 wMaxPacketSize; 37 __u8 bInterval; 38 } __attribute__((packed)); 39 40 struct usb_functionfs_descs_head_v2 { 41 __le32 magic; 42 __le32 length; 43 __le32 flags; 44 /* 45 * __le32 fs_count, hs_count, fs_count; must be included manually in 46 * the structure taking flags into consideration. 47 */ 48 } __attribute__((packed)); 49 50 /* Legacy format, deprecated as of 3.14. */ 51 struct usb_functionfs_descs_head { 52 __le32 magic; 53 __le32 length; 54 __le32 fs_count; 55 __le32 hs_count; 56 } __attribute__((packed, deprecated)); 57 58 /* MS OS Descriptor header */ 59 struct usb_os_desc_header { 60 __u8 interface; 61 __le32 dwLength; 62 __le16 bcdVersion; 63 __le16 wIndex; 64 union { 65 struct { 66 __u8 bCount; 67 __u8 Reserved; 68 }; 69 __le16 wCount; 70 }; 71 } __attribute__((packed)); 72 73 struct usb_ext_compat_desc { 74 __u8 bFirstInterfaceNumber; 75 __u8 Reserved1; 76 __struct_group(/* no tag */, IDs, /* no attrs */, 77 __u8 CompatibleID[8]; 78 __u8 SubCompatibleID[8]; 79 ); 80 __u8 Reserved2[6]; 81 }; 82 83 struct usb_ext_prop_desc { 84 __le32 dwSize; 85 __le32 dwPropertyDataType; 86 __le16 wPropertyNameLength; 87 } __attribute__((packed)); 88 89 #ifndef __KERNEL__ 90 91 /* 92 * Descriptors format: 93 * 94 * | off | name | type | description | 95 * |-----+-----------+--------------+--------------------------------------| 96 * | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC_V2 | 97 * | 4 | length | LE32 | length of the whole data chunk | 98 * | 8 | flags | LE32 | combination of functionfs_flags | 99 * | | eventfd | LE32 | eventfd file descriptor | 100 * | | fs_count | LE32 | number of full-speed descriptors | 101 * | | hs_count | LE32 | number of high-speed descriptors | 102 * | | ss_count | LE32 | number of super-speed descriptors | 103 * | | os_count | LE32 | number of MS OS descriptors | 104 * | | fs_descrs | Descriptor[] | list of full-speed descriptors | 105 * | | hs_descrs | Descriptor[] | list of high-speed descriptors | 106 * | | ss_descrs | Descriptor[] | list of super-speed descriptors | 107 * | | os_descrs | OSDesc[] | list of MS OS descriptors | 108 * 109 * Depending on which flags are set, various fields may be missing in the 110 * structure. Any flags that are not recognised cause the whole block to be 111 * rejected with -ENOSYS. 112 * 113 * Legacy descriptors format (deprecated as of 3.14): 114 * 115 * | off | name | type | description | 116 * |-----+-----------+--------------+--------------------------------------| 117 * | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC | 118 * | 4 | length | LE32 | length of the whole data chunk | 119 * | 8 | fs_count | LE32 | number of full-speed descriptors | 120 * | 12 | hs_count | LE32 | number of high-speed descriptors | 121 * | 16 | fs_descrs | Descriptor[] | list of full-speed descriptors | 122 * | | hs_descrs | Descriptor[] | list of high-speed descriptors | 123 * 124 * All numbers must be in little endian order. 125 * 126 * Descriptor[] is an array of valid USB descriptors which have the following 127 * format: 128 * 129 * | off | name | type | description | 130 * |-----+-----------------+------+--------------------------| 131 * | 0 | bLength | U8 | length of the descriptor | 132 * | 1 | bDescriptorType | U8 | descriptor type | 133 * | 2 | payload | | descriptor's payload | 134 * 135 * OSDesc[] is an array of valid MS OS Feature Descriptors which have one of 136 * the following formats: 137 * 138 * | off | name | type | description | 139 * |-----+-----------------+------+--------------------------| 140 * | 0 | inteface | U8 | related interface number | 141 * | 1 | dwLength | U32 | length of the descriptor | 142 * | 5 | bcdVersion | U16 | currently supported: 1 | 143 * | 7 | wIndex | U16 | currently supported: 4 | 144 * | 9 | bCount | U8 | number of ext. compat. | 145 * | 10 | Reserved | U8 | 0 | 146 * | 11 | ExtCompat[] | | list of ext. compat. d. | 147 * 148 * | off | name | type | description | 149 * |-----+-----------------+------+--------------------------| 150 * | 0 | inteface | U8 | related interface number | 151 * | 1 | dwLength | U32 | length of the descriptor | 152 * | 5 | bcdVersion | U16 | currently supported: 1 | 153 * | 7 | wIndex | U16 | currently supported: 5 | 154 * | 9 | wCount | U16 | number of ext. compat. | 155 * | 11 | ExtProp[] | | list of ext. prop. d. | 156 * 157 * ExtCompat[] is an array of valid Extended Compatiblity descriptors 158 * which have the following format: 159 * 160 * | off | name | type | description | 161 * |-----+-----------------------+------+-------------------------------------| 162 * | 0 | bFirstInterfaceNumber | U8 | index of the interface or of the 1st| 163 * | | | | interface in an IAD group | 164 * | 1 | Reserved | U8 | 1 | 165 * | 2 | CompatibleID | U8[8]| compatible ID string | 166 * | 10 | SubCompatibleID | U8[8]| subcompatible ID string | 167 * | 18 | Reserved | U8[6]| 0 | 168 * 169 * ExtProp[] is an array of valid Extended Properties descriptors 170 * which have the following format: 171 * 172 * | off | name | type | description | 173 * |-----+-----------------------+------+-------------------------------------| 174 * | 0 | dwSize | U32 | length of the descriptor | 175 * | 4 | dwPropertyDataType | U32 | 1..7 | 176 * | 8 | wPropertyNameLength | U16 | bPropertyName length (NL) | 177 * | 10 | bPropertyName |U8[NL]| name of this property | 178 * |10+NL| dwPropertyDataLength | U32 | bPropertyData length (DL) | 179 * |14+NL| bProperty |U8[DL]| payload of this property | 180 */ 181 182 struct usb_functionfs_strings_head { 183 __le32 magic; 184 __le32 length; 185 __le32 str_count; 186 __le32 lang_count; 187 } __attribute__((packed)); 188 189 /* 190 * Strings format: 191 * 192 * | off | name | type | description | 193 * |-----+------------+-----------------------+----------------------------| 194 * | 0 | magic | LE32 | FUNCTIONFS_STRINGS_MAGIC | 195 * | 4 | length | LE32 | length of the data chunk | 196 * | 8 | str_count | LE32 | number of strings | 197 * | 12 | lang_count | LE32 | number of languages | 198 * | 16 | stringtab | StringTab[lang_count] | table of strings per lang | 199 * 200 * For each language there is one stringtab entry (ie. there are lang_count 201 * stringtab entires). Each StringTab has following format: 202 * 203 * | off | name | type | description | 204 * |-----+---------+-------------------+------------------------------------| 205 * | 0 | lang | LE16 | language code | 206 * | 2 | strings | String[str_count] | array of strings in given language | 207 * 208 * For each string there is one strings entry (ie. there are str_count 209 * string entries). Each String is a NUL terminated string encoded in 210 * UTF-8. 211 */ 212 213 #endif 214 215 216 /* 217 * Events are delivered on the ep0 file descriptor, when the user mode driver 218 * reads from this file descriptor after writing the descriptors. Don't 219 * stop polling this descriptor. 220 */ 221 222 enum usb_functionfs_event_type { 223 FUNCTIONFS_BIND, 224 FUNCTIONFS_UNBIND, 225 226 FUNCTIONFS_ENABLE, 227 FUNCTIONFS_DISABLE, 228 229 FUNCTIONFS_SETUP, 230 231 FUNCTIONFS_SUSPEND, 232 FUNCTIONFS_RESUME 233 }; 234 235 /* NOTE: this structure must stay the same size and layout on 236 * both 32-bit and 64-bit kernels. 237 */ 238 struct usb_functionfs_event { 239 union { 240 /* SETUP: packet; DATA phase i/o precedes next event 241 *(setup.bmRequestType & USB_DIR_IN) flags direction */ 242 struct usb_ctrlrequest setup; 243 } __attribute__((packed)) u; 244 245 /* enum usb_functionfs_event_type */ 246 __u8 type; 247 __u8 _pad[3]; 248 } __attribute__((packed)); 249 250 251 /* Endpoint ioctls */ 252 /* The same as in gadgetfs */ 253 254 /* IN transfers may be reported to the gadget driver as complete 255 * when the fifo is loaded, before the host reads the data; 256 * OUT transfers may be reported to the host's "client" driver as 257 * complete when they're sitting in the FIFO unread. 258 * THIS returns how many bytes are "unclaimed" in the endpoint fifo 259 * (needed for precise fault handling, when the hardware allows it) 260 */ 261 #define FUNCTIONFS_FIFO_STATUS _IO('g', 1) 262 263 /* discards any unclaimed data in the fifo. */ 264 #define FUNCTIONFS_FIFO_FLUSH _IO('g', 2) 265 266 /* resets endpoint halt+toggle; used to implement set_interface. 267 * some hardware (like pxa2xx) can't support this. 268 */ 269 #define FUNCTIONFS_CLEAR_HALT _IO('g', 3) 270 271 /* Specific for functionfs */ 272 273 /* 274 * Returns reverse mapping of an interface. Called on EP0. If there 275 * is no such interface returns -EDOM. If function is not active 276 * returns -ENODEV. 277 */ 278 #define FUNCTIONFS_INTERFACE_REVMAP _IO('g', 128) 279 280 /* 281 * Returns real bEndpointAddress of an endpoint. If endpoint shuts down 282 * during the call, returns -ESHUTDOWN. 283 */ 284 #define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129) 285 286 /* 287 * Returns endpoint descriptor. If endpoint shuts down during the call, 288 * returns -ESHUTDOWN. 289 */ 290 #define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \ 291 struct usb_endpoint_descriptor) 292 293 294 295 #endif /* _UAPI__LINUX_FUNCTIONFS_H__ */ 296