Peter Ujfalusi wrote:
Looking at the patch itself, it does going to return min=SND_CTL_TLV_DB_GAIN_MUTE from snd_tlv_get_dB_range function.
However I have my doubts, if this is the correct way...
Take these two gain controls for example: RAW value GAIN1 GAIN2 0 mute mute 1 -2dB 0dB 2 0dB 1dB 3 2dB 2dB
If user space asks for the dB_range: min max GAIN1 mute 2dB GAIN2 mute 2dB
They are going to return with the same range, however if you ask for -2dB on both: GAIN1 will be -2dB GAIN2 will be muted
Or not, depending on which direction you instruct it to round.
So we are kind of hiding the dB range for the control.
This is unavoidable if the only information returned is min/max. To get the entire curve and resolution, you'd have to get the dB value for each raw volume value.
Regards, Clemens