usb: gadget: f_uac2: Expose all string descriptors through configfs.

This makes all string descriptors configurable for the UAC2 gadget
so the user can configure names of terminals and controls. Alt mode
names are not included for now and will be in future work related
to adding alternate settings.

discussion thread for api changes for alt mode settings:
https://lore.kernel.org/linux-usb/35be4668-58d3-894a-72cf-de1afaacae45@ivitera.com/T/

Signed-off-by: Chris Wulff <chris.wulff@biamp.com>
Link: https://lore.kernel.org/r/20240804001923.3279431-2-crwulff@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst
index a89b49e639c3..8092e250ec27 100644
--- a/Documentation/usb/gadget-testing.rst
+++ b/Documentation/usb/gadget-testing.rst
@@ -765,6 +765,17 @@ The uac2 function provides these attributes in its function directory:
 	req_number       the number of pre-allocated request for both capture
 	                 and playback
 	function_name    name of the interface
+	if_ctrl_name     topology control name
+	clksrc_in_name   input clock name
+	clksrc_out_name  output clock name
+	p_it_name        playback input terminal name
+	p_it_ch_name     playback input first channel name
+	p_ot_name        playback output terminal name
+	p_fu_vol_name    playback function unit name
+	c_it_name        capture input terminal name
+	c_it_ch_name     capture input first channel name
+	c_ot_name        capture output terminal name
+	c_fu_vol_name    capture functional unit name
 	c_terminal_type  code of the capture terminal type
 	p_terminal_type  code of the playback terminal type
 	================ ====================================================