[alsa-devel] I don't understand snd_pcm_ops
timur at freescale.com
Sat May 19 01:13:49 CEST 2007
I'm new to ALSA driver development, and I'm writing an SOC driver for new hardware. Can
someone explain to me what the snd_pcm_ops structure is for? And it sounds like a stupid
question, but after studying documentation and sample code, I'm still confused.
First off, I thought PCM stood for Pulse Code Modulation, but that just describes the
format of the digital data. I don't understand what a PCM operation could be.
I've seen documentation where PCM is considered an alternative to I2S or AC97. But if you
look at eti_b1_wm8731.c, you'll see this:
So is the AT91 a PCM device or an I2S device???
Some background: I'm writing driver for a new SOC that has an I2S interface, and it's
talking to a CS4270 codec, but the CS4270 codec is wired up in "stand-alone" mode, so
there's no software configuration.
Linux Kernel Developer @ Freescale
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