diff options
| author | Michal Nazarewicz <mina86@mina86.com> | 2014-02-28 16:50:23 +0530 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2014-03-05 14:40:11 -0600 |
| commit | ac8dde11f2b397fe2282f585d5eb427a13675ea2 (patch) | |
| tree | c871cc0fcb74b6f4d0794b5dac0719436c8dfed8 /include/uapi/linux/usb | |
| parent | 8d4e897bd0150fab594a871484e554472ee01452 (diff) | |
usb: gadget: f_fs: Add flags to descriptors block
This reworks the way SuperSpeed descriptors are added and instead of
having a magic after full and high speed descriptors, it reworks the
whole descriptors block to include a flags field which lists which
descriptors are present and makes future extensions possible.
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'include/uapi/linux/usb')
| -rw-r--r-- | include/uapi/linux/usb/functionfs.h | 49 |
1 files changed, 30 insertions, 19 deletions
diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h index 0f8f7be5b0d3..2a4b4a72a4f9 100644 --- a/include/uapi/linux/usb/functionfs.h +++ b/include/uapi/linux/usb/functionfs.h @@ -10,10 +10,15 @@ enum { FUNCTIONFS_DESCRIPTORS_MAGIC = 1, - FUNCTIONFS_STRINGS_MAGIC = 2 + FUNCTIONFS_STRINGS_MAGIC = 2, + FUNCTIONFS_DESCRIPTORS_MAGIC_V2 = 3, }; -#define FUNCTIONFS_SS_DESC_MAGIC 0x0055DE5C +enum functionfs_flags { + FUNCTIONFS_HAS_FS_DESC = 1, + FUNCTIONFS_HAS_HS_DESC = 2, + FUNCTIONFS_HAS_SS_DESC = 4, +}; #ifndef __KERNEL__ @@ -30,33 +35,39 @@ struct usb_endpoint_descriptor_no_audio { /* - * 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 | + * | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC_V2 | + * | 4 | length | LE32 | length of the whole data chunk | + * | 8 | flags | LE32 | combination of functionfs_flags | + * | | fs_count | LE32 | number of full-speed descriptors | + * | | hs_count | LE32 | number of high-speed descriptors | + * | | ss_count | LE32 | number of super-speed 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 | + * + * 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: + * + * | 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 | - * | | ss_magic | LE32 | FUNCTIONFS_SS_DESC_MAGIC | - * | | ss_count | LE32 | number of super-speed descriptors | - * | | ss_descrs | Descriptor[] | list of super-speed descriptors | * - * ss_magic: if present then it implies that SS_DESCs are also present - * descs are just valid USB descriptors and have the following format: + * 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 | * |-----+-----------------+------+--------------------------| |