Rong-Jhe wrote: > I have a USB audio device, C-media, that is applying USB audio class v1.0. > This audio device has an interrupt endpoint within the USB HID interface. > This interrupt endpoint is used to get status from the audio device, and the > status is about mixer. > > In some audio device, the interrupt endpoint is wihtin the audio control > interface, so usb audio driver for ALSA can handle it. > Thus, users can push the buttons on the audio device to control the volume. > > In my case, the interrupt endpoint is within the USB HID interface, so it is > controlled by USB HID interface. > > It seems that ALSA driver can not know the device status from HID interface, > so I can not use the buttons on the audio device to control the volume. > In windows XP, this function can work. > > Is there a solution to solve it? > Thanks. > I don't understand what a USB HID interface is, but I think the answer to your question is that if the interface isn't standard, then the driver has to be customized for that device. The developers can only do this if the api is release to them (I suppose they could use reverse engineering too). In windows this is probably already built into the closed source driver by C-Media. You could ask on the alsa-devel list if this is being worked on or if the API spec is available from C-Media. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
