On Tue, Dec 02, 2008 at 12:15:51PM +0200, Grazvydas Ignotas wrote:
On Tue, Dec 2, 2008 at 1:26 AM, Mark Brown broonie@sirena.org.uk wrote:
Hrm. Disabling the gain like this is likely to cause trouble for jack detect. However, that's not implemented yet so not a problem currently.
Well the TRM doesn't mention jack detect at all (except headset detect using separate switch connected to GPIO). Or is that some software feature?
Hardware normally.
SOC_DOUBLE_TLV("Microphone Boost", TWL4030_REG_ANAMIC_GAIN,0, 3, 5, 0, microphone_gain_tlv),
Should be "Microphone Boost Volume" or possibly just "Microphone Volume".
Setting this to 0 still records from MICs, but the signal is rather weak, so it looks more like boost to me. This control also affects aux/line inputs if they are selected, and causes rather bad
So Microphone Boost Volume then (the addition of Volume is the important bit here).
distortions for them if control is not set to 0. Perhaps this control could be disabled (or at least automatically set to 0) while aux/line inputs are selected? Can that be done?
Yes, have your custom control update it and use snd_ctl_notify() to kick applications if you update the user visible value. Even better would be to do something more fancy and use a custom control to present a shadowed control to user space so they don't see the adjustment.