I have a USB device with descriptor type 7. The current lsusb only handles up to 5, So it just prints: -
unknown descriptor type: 07 21 07 88 13 ff 03
Descriptor type 0x21, length 0x07 ... :)
I'd guess that's a class-specific device descriptor. See the spec for that class type.
You'll notice that the source to "lsusb" (version 0.11) and various other places use 0x21 as USB_DT_CS_DEVICE.
One spec referred to the audio spec (not usb 2.0 spec!) as where a "class-specific descriptor" framework is defined, but I didn't check that out. The second 0x07 would be defined by that class, and the last four bytes would be the real information.
- Dave
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