On 3/6/23 01:39, Muni Sekhar wrote: > On Tue, May 31, 2022 at 8:44 PM Pierre-Louis Bossart > <pierre-louis.bossart@xxxxxxxxxxxxxxx> wrote: >> >> >>> I am looking for any existing user space test utilities to test >>> SOUNDWIRE SUBSYSTEM in Linux kernel. Can someone please point me to >>> this. >> >> There are no specific userspace utilities to test the bus itself, you >> can use existing alsa-lib/alsa-utils applications to play/capture audio >> and check for events, i.e. aplay, arecord, speaker-test, amixer, >> alsamixer, evtest > alsa-lib/alsa-utils applications can be used for transmitting audio data. > How to transmit non-audio data over the Soundwire interface? There's no good answer to such a vague question. "non-audio data" can be transmitted over the control channel or the "BRA" mode, if supported. That's how drivers provide firmware or configuration blobs, but that's internal to the kernel. There's no dedicated/standard interface to send "non-audio data" from userpace to a specific device. It's not SoundWire specific btw, you'd have the same answer for HDaudio.
