[alsa-devel] [ASoC] machine driver and channel configuration

[Timur Tabi]

Matthieu CASTET wrote:
> Hi,
> 
> If the platform/cpu_dai driver and codec support capture and playback channels.
> But on the board only the playback link is connected.
> 
> In this configuration, the codec and platform/cpu_dai driver shouldn't try to
> use the capture path (and the resource associated to this).
> 
> 
> Is there a way to do something like that ?

I'm just learning about ASoC myself, but using wm8731.c as an example, wouldn't this work:

struct snd_soc_codec_dai wm8731_dai = {
	.name = "WM8731",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8731_RATES,
		.formats = WM8731_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8731_RATES,
		.formats = WM8731_FORMATS,},

Just change capture.channels_min and channels_max to 0.

-- 
Timur Tabi
Linux Kernel Developer @ Freescale