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usb: gadget: f_midi: allow customizing the USB MIDI interface string through configfs

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When using f_midi from configfs the USB MIDI interface string is hardcoded
to 'MIDI function'.

This USB string descriptor is used by some third-party OS or software to
display the name of the MIDI device

Since we add an additional string option a new macro block was created to
factorize declarations

Signed-off-by: Victor Krawiec <victor.krawiec@arturia.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20251209164006.143219-1-victor.krawiec@arturia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Victor Krawiec
2025-12-09 17:40:06 +01:00
committed by Greg Kroah-Hartman
parent 4dee13db29
commit 1c93738177
4 changed files with 78 additions and 68 deletions
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17
Documentation/usb/gadget-testing.rst
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@@ -368,14 +368,15 @@ Function-specific configfs interface
The function name to use when creating the function directory is "midi".
The MIDI function provides these attributes in its function directory:
=============== ====================================
buflen MIDI buffer length
id ID string for the USB MIDI adapter
in_ports number of MIDI input ports
index index value for the USB MIDI adapter
out_ports number of MIDI output ports
qlen USB read request queue length
=============== ====================================
================ ====================================
buflen MIDI buffer length
id ID string for the USB MIDI adapter
in_ports number of MIDI input ports
index index value for the USB MIDI adapter
out_ports number of MIDI output ports
qlen USB read request queue length
interface_string USB AudioControl interface string
================ ====================================
Testing the MIDI function
-------------------------