1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI__LINUX_FUNCTIONFS_H__
3 #define _UAPI__LINUX_FUNCTIONFS_H__
6 #include <linux/types.h>
7 #include <linux/ioctl.h>
9 #include <linux/usb/ch9.h>
13 FUNCTIONFS_DESCRIPTORS_MAGIC
= 1,
14 FUNCTIONFS_STRINGS_MAGIC
= 2,
15 FUNCTIONFS_DESCRIPTORS_MAGIC_V2
= 3,
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,
29 /* Descriptor of an non-audio endpoint */
30 struct usb_endpoint_descriptor_no_audio
{
34 __u8 bEndpointAddress
;
36 __le16 wMaxPacketSize
;
38 } __attribute__((packed
));
40 struct usb_functionfs_descs_head_v2
{
45 * __le32 fs_count, hs_count, fs_count; must be included manually in
46 * the structure taking flags into consideration.
48 } __attribute__((packed
));
50 /* Legacy format, deprecated as of 3.14. */
51 struct usb_functionfs_descs_head
{
56 } __attribute__((packed
, deprecated
));
58 /* MS OS Descriptor header */
59 struct usb_os_desc_header
{
71 } __attribute__((packed
));
73 struct usb_ext_compat_desc
{
74 __u8 bFirstInterfaceNumber
;
77 __u8 SubCompatibleID
[8];
81 struct usb_ext_prop_desc
{
83 __le32 dwPropertyDataType
;
84 __le16 wPropertyNameLength
;
85 } __attribute__((packed
));
92 * | off | name | type | description |
93 * |-----+-----------+--------------+--------------------------------------|
94 * | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC_V2 |
95 * | 4 | length | LE32 | length of the whole data chunk |
96 * | 8 | flags | LE32 | combination of functionfs_flags |
97 * | | eventfd | LE32 | eventfd file descriptor |
98 * | | fs_count | LE32 | number of full-speed descriptors |
99 * | | hs_count | LE32 | number of high-speed descriptors |
100 * | | ss_count | LE32 | number of super-speed descriptors |
101 * | | os_count | LE32 | number of MS OS descriptors |
102 * | | fs_descrs | Descriptor[] | list of full-speed descriptors |
103 * | | hs_descrs | Descriptor[] | list of high-speed descriptors |
104 * | | ss_descrs | Descriptor[] | list of super-speed descriptors |
105 * | | os_descrs | OSDesc[] | list of MS OS descriptors |
107 * Depending on which flags are set, various fields may be missing in the
108 * structure. Any flags that are not recognised cause the whole block to be
109 * rejected with -ENOSYS.
111 * Legacy descriptors format (deprecated as of 3.14):
113 * | off | name | type | description |
114 * |-----+-----------+--------------+--------------------------------------|
115 * | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC |
116 * | 4 | length | LE32 | length of the whole data chunk |
117 * | 8 | fs_count | LE32 | number of full-speed descriptors |
118 * | 12 | hs_count | LE32 | number of high-speed descriptors |
119 * | 16 | fs_descrs | Descriptor[] | list of full-speed descriptors |
120 * | | hs_descrs | Descriptor[] | list of high-speed descriptors |
122 * All numbers must be in little endian order.
124 * Descriptor[] is an array of valid USB descriptors which have the following
127 * | off | name | type | description |
128 * |-----+-----------------+------+--------------------------|
129 * | 0 | bLength | U8 | length of the descriptor |
130 * | 1 | bDescriptorType | U8 | descriptor type |
131 * | 2 | payload | | descriptor's payload |
133 * OSDesc[] is an array of valid MS OS Feature Descriptors which have one of
134 * the following formats:
136 * | off | name | type | description |
137 * |-----+-----------------+------+--------------------------|
138 * | 0 | inteface | U8 | related interface number |
139 * | 1 | dwLength | U32 | length of the descriptor |
140 * | 5 | bcdVersion | U16 | currently supported: 1 |
141 * | 7 | wIndex | U16 | currently supported: 4 |
142 * | 9 | bCount | U8 | number of ext. compat. |
143 * | 10 | Reserved | U8 | 0 |
144 * | 11 | ExtCompat[] | | list of ext. compat. d. |
146 * | off | name | type | description |
147 * |-----+-----------------+------+--------------------------|
148 * | 0 | inteface | U8 | related interface number |
149 * | 1 | dwLength | U32 | length of the descriptor |
150 * | 5 | bcdVersion | U16 | currently supported: 1 |
151 * | 7 | wIndex | U16 | currently supported: 5 |
152 * | 9 | wCount | U16 | number of ext. compat. |
153 * | 11 | ExtProp[] | | list of ext. prop. d. |
155 * ExtCompat[] is an array of valid Extended Compatiblity descriptors
156 * which have the following format:
158 * | off | name | type | description |
159 * |-----+-----------------------+------+-------------------------------------|
160 * | 0 | bFirstInterfaceNumber | U8 | index of the interface or of the 1st|
161 * | | | | interface in an IAD group |
162 * | 1 | Reserved | U8 | 1 |
163 * | 2 | CompatibleID | U8[8]| compatible ID string |
164 * | 10 | SubCompatibleID | U8[8]| subcompatible ID string |
165 * | 18 | Reserved | U8[6]| 0 |
167 * ExtProp[] is an array of valid Extended Properties descriptors
168 * which have the following format:
170 * | off | name | type | description |
171 * |-----+-----------------------+------+-------------------------------------|
172 * | 0 | dwSize | U32 | length of the descriptor |
173 * | 4 | dwPropertyDataType | U32 | 1..7 |
174 * | 8 | wPropertyNameLength | U16 | bPropertyName length (NL) |
175 * | 10 | bPropertyName |U8[NL]| name of this property |
176 * |10+NL| dwPropertyDataLength | U32 | bPropertyData length (DL) |
177 * |14+NL| bProperty |U8[DL]| payload of this property |
180 struct usb_functionfs_strings_head
{
185 } __attribute__((packed
));
190 * | off | name | type | description |
191 * |-----+------------+-----------------------+----------------------------|
192 * | 0 | magic | LE32 | FUNCTIONFS_STRINGS_MAGIC |
193 * | 4 | length | LE32 | length of the data chunk |
194 * | 8 | str_count | LE32 | number of strings |
195 * | 12 | lang_count | LE32 | number of languages |
196 * | 16 | stringtab | StringTab[lang_count] | table of strings per lang |
198 * For each language there is one stringtab entry (ie. there are lang_count
199 * stringtab entires). Each StringTab has following format:
201 * | off | name | type | description |
202 * |-----+---------+-------------------+------------------------------------|
203 * | 0 | lang | LE16 | language code |
204 * | 2 | strings | String[str_count] | array of strings in given language |
206 * For each string there is one strings entry (ie. there are str_count
207 * string entries). Each String is a NUL terminated string encoded in
215 * Events are delivered on the ep0 file descriptor, when the user mode driver
216 * reads from this file descriptor after writing the descriptors. Don't
217 * stop polling this descriptor.
220 enum usb_functionfs_event_type
{
233 /* NOTE: this structure must stay the same size and layout on
234 * both 32-bit and 64-bit kernels.
236 struct usb_functionfs_event
{
238 /* SETUP: packet; DATA phase i/o precedes next event
239 *(setup.bmRequestType & USB_DIR_IN) flags direction */
240 struct usb_ctrlrequest setup
;
241 } __attribute__((packed
)) u
;
243 /* enum usb_functionfs_event_type */
246 } __attribute__((packed
));
249 /* Endpoint ioctls */
250 /* The same as in gadgetfs */
252 /* IN transfers may be reported to the gadget driver as complete
253 * when the fifo is loaded, before the host reads the data;
254 * OUT transfers may be reported to the host's "client" driver as
255 * complete when they're sitting in the FIFO unread.
256 * THIS returns how many bytes are "unclaimed" in the endpoint fifo
257 * (needed for precise fault handling, when the hardware allows it)
259 #define FUNCTIONFS_FIFO_STATUS _IO('g', 1)
261 /* discards any unclaimed data in the fifo. */
262 #define FUNCTIONFS_FIFO_FLUSH _IO('g', 2)
264 /* resets endpoint halt+toggle; used to implement set_interface.
265 * some hardware (like pxa2xx) can't support this.
267 #define FUNCTIONFS_CLEAR_HALT _IO('g', 3)
269 /* Specific for functionfs */
272 * Returns reverse mapping of an interface. Called on EP0. If there
273 * is no such interface returns -EDOM. If function is not active
276 #define FUNCTIONFS_INTERFACE_REVMAP _IO('g', 128)
279 * Returns real bEndpointAddress of an endpoint. If endpoint shuts down
280 * during the call, returns -ESHUTDOWN.
282 #define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129)
285 * Returns endpoint descriptor. If endpoint shuts down during the call,
286 * returns -ESHUTDOWN.
288 #define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \
289 struct usb_endpoint_descriptor)
293 #endif /* _UAPI__LINUX_FUNCTIONFS_H__ */