How does ALSALIB commuciates with low level kernel API

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Dear experts,

I am too new in ALSA, trying to read a little bit and understand.
I want to underatnd how ALSA userspace API calls kernel space code ?
for example when I call  snd_pcm_open() which code is called in kernel
sound code ?
and how the link is made ? via IOCTL/write ?

Please clarify

Thanks a lot in advance.

Mehdi
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