1 ======================
2 FunctionFS Descriptors
3 ======================
4
5 Some of the descriptors that can be written to
6 described below. Device and configuration desc
7 by the composite gadget and are not written by
8 FFS gadget.
9
10 Descriptors are written to the "ep0" file in t
11 following the descriptor header.
12
13 .. kernel-doc:: include/uapi/linux/usb/functio
14 :doc: descriptors
15
16 Interface Descriptors
17 ---------------------
18
19 Standard USB interface descriptors may be writ
20 most recent interface descriptor determines wh
21 descriptors are accepted.
22
23 Class-Specific Descriptors
24 --------------------------
25
26 Class-specific descriptors are accepted only f
27 most recent interface descriptor. The followin
28 class-specific descriptors that are supported.
29
30 DFU Functional Descriptor
31 ~~~~~~~~~~~~~~~~~~~~~~~~~
32
33 When the interface class is USB_CLASS_APP_SPEC
34 is USB_SUBCLASS_DFU, a DFU functional descript
35 The DFU functional descriptor is a described i
36 Device Firmware Upgrade (DFU), version 1.1 as
37
38 .. kernel-doc:: include/uapi/linux/usb/functio
39 :doc: usb_dfu_functional_descriptor
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