/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#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 |
* | | eventfd | LE32 | eventfd file descriptor |
* | | 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 | 1 |
* | 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 endpoint shuts down
* during the call, returns -ESHUTDOWN.
*/
#define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129)
/*
* Returns endpoint descriptor. If endpoint shuts down during the call,
* returns -ESHUTDOWN.
*/
#define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \
struct usb_endpoint_descriptor)
#endif /* __LINUX_FUNCTIONFS_H__ */