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usb: gadget: f_fs: Add support for SuperSpeed Mode

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Allow userspace to pass SuperSpeed descriptors and
handle them in the driver accordingly.
This change doesn't modify existing desc_header and thereby
keeps the ABI changes backward compatible i.e. existing
userspace drivers compiled with old header (functionfs.h)
would continue to work with the updated kernel.

Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Manu Gautam 2014-02-28 16:50:22 +05:30 • committed by Felipe Balbi
parent d8eb6c653e
commit 8d4e897bd0
3 changed files with 147 additions and 50 deletions
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5
include/uapi/linux/usb/functionfs.h
View file

@ -13,6 +13,7 @@ enum {
FUNCTIONFS_STRINGS_MAGIC = 2
};
#define FUNCTIONFS_SS_DESC_MAGIC 0x0055DE5C
#ifndef __KERNEL__
@ -50,7 +51,11 @@ struct usb_functionfs_descs_head {
* | 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:
*
* | off | name | type | description |