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functionfs.h
/* 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__ */