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functionfs.h
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#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 }; /* 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)); /* * All numbers must be in little endian order. */ struct usb_functionfs_descs_head { __le32 magic; __le32 length; __le32 fs_count; __le32 hs_count; } __attribute__((packed)); /* * Descriptors format: * * | off | name | type | description | * |-----+-----------+--------------+--------------------------------------| * | 0 | magic | LE32 | FUNCTIONFS_{FS,HS}_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 | * * descs are just valid USB descriptors and 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 | */ 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) #endif /* __LINUX_FUNCTIONFS_H__ */