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.
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| @@ -13,6 +13,7 @@ enum { · 12 unmodified lines | ||
| 13 | 13 | FUNCTIONFS_STRINGS_MAGIC = 2 |
| 14 | 14 | }; |
| 15 | 15 | |
| 16 | +#define FUNCTIONFS_SS_DESC_MAGIC 0x0055DE5C | |
| 16 | 17 | |
| 17 | 18 | #ifndef __KERNEL__ |
| 18 | 19 | |
| @@ -50,7 +51,11 @@ struct usb_functionfs_descs_head { · 31 unmodified lines | ||
| 50 | 51 | * | 12 | hs_count | LE32 | number of high-speed descriptors | |
| 51 | 52 | * | 16 | fs_descrs | Descriptor[] | list of full-speed descriptors | |
| 52 | 53 | * | | hs_descrs | Descriptor[] | list of high-speed descriptors | |
| 54 | + * | | ss_magic | LE32 | FUNCTIONFS_SS_DESC_MAGIC | | |
| 55 | + * | | ss_count | LE32 | number of super-speed descriptors | | |
| 56 | + * | | ss_descrs | Descriptor[] | list of super-speed descriptors | | |
| 53 | 57 | * |
| 58 | + * ss_magic: if present then it implies that SS_DESCs are also present | |
| 54 | 59 | * descs are just valid USB descriptors and have the following format: |
| 55 | 60 | * |
| 56 | 61 | * | off | name | type | description | |