On Mon, Dec 11, 2017 at 01:01:56PM -0600, Andrew F. Davis wrote:
The TAS5722 supports modifying volume in 0.25dB steps (as opposed to 0.5dB steps on the TAS5720). Introduce a custom mixer control that allows taking advantage of this finer output volume granularity.
Don't do this, it's just making things more complicated. Instead do what other drivers do and register different sets of controls depending on which part you're working with. The normal thing is to have a big table for all the shared controls that are the same on all variants then register additional tables during probe with those that vary for the individul devices.
static const struct snd_kcontrol_new tas5720_snd_controls[] = { SOC_SINGLE_TLV("Speaker Driver Playback Volume",
TAS5720_VOLUME_CTRL_REG, 0, 0xff, 0, dac_tlv),
TAS5720_VOLUME_CTRL_REG, 0, 0xff, 0, tas5720_dac_tlv),- SOC_SINGLE_TLV("Speaker Driver Analog Gain", TAS5720_ANALOG_CTRL_REG,
TAS5720_ANALOG_GAIN_SHIFT, 3, 0, dac_analog_tlv),
As ever all volume controls should end in Volume (like the immediately adjacent control does).