[wdmaudiodev] Re: Raspberry Pi OTG Audio
- From: Robert Bielik <Robert.Bielik@xxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sun, 4 Feb 2018 16:56:19 +0000
Total length of listed below descriptors not match to shown in header:
AH! Thank you Genadi!
The length is computed in
https://github.com/torvalds/linux/blob/master/drivers/usb/gadget/function/f_uac2.c#L219,
but I see now, they have failed to include the size of the AC Interface Header
Descriptor itself!
8 + 8 + 17 + 17 + 12 + 12 = 74 = 0x4A
AC Interface Header Descriptor:
------------------------------
0x09 bLength
0x24 bDescriptorType
0x01 bDescriptorSubtype
0x0200 bcdADC
0x08 bCategory (IO_BOX)
0x004A wTotalLength (74 bytes)
*** ERROR: Invalid wTotalLength 0x004A, should be 0x0053.
0x00 bmControls
That's where the missing 9 bytes are! Ok, filing an issue with the linux kernel
then 😊
I'll try patch this myself also see if it works out.
Regards
/Robert
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