On Tue, 12 May 2020, Greg KH wrote: > On Tue, May 12, 2020 at 10:13:10PM +0530, Subhashini Rao Beerisetty wrote: > > ... > > [116677.281756] usbcore: registered new interface driver snd-usb-audio > > > > The following nodes are present in the /dev/snd > > > > $ ls -l /dev/snd/ > > > > total 0 > > > > drwxr-xr-x 2 root root 60 May 12 11:32 by-id > > > > drwxr-xr-x 2 root root 60 May 12 11:32 by-path > > > > crw-rw---- 1 root audio 116, 2 May 12 11:32 controlC1 > > > > crw-rw---- 1 root audio 116, 4 May 12 11:32 pcmC1D0c > > > > crw-rw---- 1 root audio 116, 3 May 12 11:32 pcmC1D0p > > > > crw-rw---- 1 root audio 116, 1 May 12 11:32 seq > > > > crw-rw---- 1 root audio 116, 33 May 12 11:32 timer > > > > > > > > What are all these devices present in /dev/snd > > > > How do I use it for playing and recording an audio? > > > > Basically first I want to gain knowledge on set of test cases I can > > run on ALSA and then learn ALSA kernel modules stuff including > > snd_usb_audio mdule. > > > > So please guide me by providing related documentation/Steps. > > ALSA should "just work" with this device, no need to do anything to the > kernel driver. Does it not work properly for you as-is? To clarify (if it's not too obvious): Normally these devices are never accessed directly by programs, instead, there is a userspace library called alsa-lib which provides a userspace API and then handles the communication with the kernel devices. /Ricard -- Ricard Wolf Wanderlof ricardw(at)axis.com Axis Communications AB, Lund, Sweden www.axis.com Phone +46 46 272 2016 Fax +46 46 13 61 30
