Hello,
I see in linux tlv320aic driver that playback device has between 1 to 2 channels and capture device has between 1 to 2 channels:
static struct snd_soc_dai_driver aic3x_dai = {
.name = "tlv320aic3x-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
.rates = AIC3X_RATES,
.formats = AIC3X_FORMATS,},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
.rates = AIC3X_RATES,
.formats = AIC3X_FORMATS,},
.ops = &aic3x_dai_ops,
.symmetric_rates = 1,
};
But I also see that the amixer utility for this devce is controlling channels as following:
To unmute/mute the microphone input
$ amixer sset ‘Right PGA Mixer Mic3L’ on/off $ amixer sset ‘Right PGA Mixer Mic3R’ on/off $ amixer sset ‘Left PGA Mixer Mic3L’ on/off $ amixer sset ‘Left PGA Mixer Mic3R’ on/off
To unmute/mute the line input
$ amixer sset 'Right PGA Mixer Line1R' on/off $ amixer sset 'Right PGA Mixer Line1L' on/off $ amixer sset 'Left PGA Mixer Line1R' on/off $ amixer sset 'Left PGA Mixer Line1L' on/off
According to the above it seems like there are 8 channels for capture,
I also know that phsycally we have 2 channels: 1 line-in, and 1 microphone.
So I don't understand... Is it 2, 4, or 8 ? Why there are such differences as listed above and what is correct ?
If we only have 2 channels for capture, why do we need the above 8 amixer on/off ?
Thanks,
Ran
