Re: [alsa-devel] ASoC: Defining "signed integer" mixer controls?

Stuart Longland wrote:

/* ADC PGA gain volumes. From 0 to 59.5 dB in 0.5 dB steps */ static DECLARE_TLV_DB_MINMAX(adc_tlv, 0, 0);

The comment is wrong, this control goes from 0 to 0 dB.

SOC_DOUBLE_R_TLV("PCM Playback Volume", AIC3204_LDACVOL, AIC3204_RDACVOL, 0, 127, 0, dac_tlv),

However; it treats the bitfield as unsigned, which is wrong in this case. The bitfield is a signed integer in two's complement format. How do I convince ALSA that these integers have a sign bit?

ALSA's controls use signed values, it's the SOC_ macros that assume bitfields. You should be able to define a control with your own callbacks like in a non-ASoC driver.

Regards, Clemens