On Mon, 27 Jun 2022 12:00:34 +0200, Egor Vorontsov wrote: > > Fiero SC-01 is a USB sound card with two mono inputs and a single > stereo output. The inputs are composed into a single stereo stream. > > The device uses a vendor-provided driver on Windows and does not work > at all without it. The driver mostly provides ASIO functionality, but > also alters the way the sound card is queried for sample rates and > clocks. > > ALSA queries those failing with an EPIPE (same as Windows 10 does). > Presumably, the vendor-provided driver does not query it at all, simply > matching by VID:PID. Thus, I consider this a buggy firmware and adhere > to a set of fixed endpoint quirks instead. > > The soundcard has an internal clock. Implicit feedback mode is required > for the playback. > > I have updated my device to v1.1.0 from a Windows 10 VM using a vendor- > provided binary prior to the development, hoping for it to just begin > working. The device provides no obvious way to downgrade the firmware, > and regardless, there's no binary available for v1.0.0 anyway. > > Thus, I will be getting another unit to extend the patch with support > for that. Expected to be a simple copy-paste of the existing one, > though. > > There were no previous reports of that device in context of Linux > anywhere. Other issues have been reported though, but that's out of the > scope. > > Signed-off-by: Egor Vorontsov <sdoregor@xxxxxxxx> Thanks, now applied both patches. Takashi
