Hi all,
Work has continued on the TLV320AIC3204 CODEC driver, and there have been a number of fixes since the last patch was published. However, this CODEC is a rather complicated beast to drive, some may find the controls a little unweildy, and as such, I was wondering if the machine driver could be used to abstract this for a given target?
It's no use abstracting this in the CODEC, because some may want to access the functionality I'm trying to hide.
The CODEC we're using has three line inputs; which may be treated as either three mono differential inputs, or three stereo single-ended inputs. There are also a couple of common-mode sources that may be connected. The resistances connecting these is selectable; 10k, 20k or 40k... and as such, it's possible to do some hardware mixing of the sources inside the CODEC.
At the moment I have each of the inputs to the ADC's PGA ("MICPGA"), with one control for each possible path... There are two ADCs, so two PGAs... and the inputs can be connected to either the negative or positive terminal of the PGA in many cases. That leads to a large number of controls (the following is from amixer):
Simple mixer control 'Left MICPGA+ Output Mixer IN1L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Left MICPGA+ Output Mixer IN1R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Left MICPGA+ Output Mixer IN2L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Left MICPGA+ Output Mixer IN3L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: '10k' Simple mixer control 'Left MICPGA- Output Mixer CM1L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Left MICPGA- Output Mixer CM2L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Left MICPGA- Output Mixer IN2R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Left MICPGA- Output Mixer IN3R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: '10k' [...] Simple mixer control 'Right MICPGA+ Output Mixer IN1R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: '10k' Simple mixer control 'Right MICPGA+ Output Mixer IN2L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Right MICPGA+ Output Mixer IN2R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Right MICPGA+ Output Mixer IN3R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: '10k' Simple mixer control 'Right MICPGA- Output Mixer CM1R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Right MICPGA- Output Mixer CM2R',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: 'not-connected' Simple mixer control 'Right MICPGA- Output Mixer IN1L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: '10k' Simple mixer control 'Right MICPGA- Output Mixer IN3L',0 Capabilities: enum Items: 'not-connected' '10k' '20k' '40k' Item0: '10k'
These controls are useful to a machine driver for implementing controls, but they're not that friendly to an end user. I was wondering if it was possible to hide these controls from the userland, but expose them to the machine driver to be presented to the user in a more meaningful manner. (i.e. we can have just simple mute switches for IN1 and IN3, labelling them "handset" and "internal mic" in our device).
Or would I be better defining these controls in the machine driver?
Regards,