On Tue, 2016-10-18 at 14:07 +0200, Takashi Iwai wrote: > On Wed, 12 Oct 2016 18:15:04 +0200, > Bastien Nocera wrote: > > > > On Wed, 2016-10-12 at 18:06 +0200, Clemens Ladisch wrote: > > > Bastien Nocera wrote: > > > > On Wed, 2016-10-12 at 14:43 +0200, Clemens Ladisch wrote: > > > > > Bastien Nocera wrote: > > > > > > " > > > > > > A change of state in the audio function is most often > > > > > > caused by > > > > > > a > > > > > > certain event that takes place. An event can either be > > > > > > user- > > > > > > initiated > > > > > > or device-initiated. User-initiated jack insertion or > > > > > > removal > > > > > > is a > > > > > > typical example of a user-initiated event. > > > > > > " > > > > > > > > > > > > > > > There are not many USB Audio 2.0 devices, and I'm not aware > > > > > of > > > > > any > > > > > that actually implements this. > > > > > > > > > > > > I guess I would see whether there are events if I captured the > > > > USB > > > > traffic even without special handling/turning on a feature in > > > > the > > > > drivers, right? > > > > > > > > > Most devices do not even have the status endpoint (see "lsusb > > > -v"). > > > To check what events arrive, you can add logging to the > > > snd_usb_mixer_interrupt() function. > > > > I'm guessing it doesn't support it then (see attached log) > > So this looks like a HID, not from the audio device class. > It's an oft-seen implementation. > > > I also checked the input device output when plugging in something, > > with > > evtest, and no feedback either. > > Then at first you need to hack a HID driver to support this device. > It'll create an input device, and then we'll need to find some way to > couple the given input device and the audio device. We can parse the > sysfs device path to figure out, but I'm not sure what's the best way > to tell it to applications. You misunderstood. There's no input events on the input device, there's also no hidraw events (hid-recorder didn't see any events) and using usbmon also got me no USB events whatsoever when plugging or unplugging a jack on either the headphones or the microphone jack. So there's really nothing that we can do for this hardware. Shame, it would have been pretty useful to me :) Thanks all for your help _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
