[alsa-devel] ASoC: TLV320AIC3x: Adding additional functionality for 3106 with [Patch] for discuss

[Peter Ujfalusi]

On 03/16/2016 12:26 PM, Timur Karaldin wrote:
> Hi Peter!
> 
> 16.03.2016 11:57, Peter Ujfalusi пишет:
>> Hi Timur,
>>
>> please avoid top posting.
>>
>> On 03/15/16 18:13, Timur Karaldin wrote:
>>> Ok, I choose the way #1 without changing kcontrol names.
>>> Another thing I don't understand is the way for caching gain volume if I have
>>> switches muted. Is there any proper way for storing cached values between gain
>>> and switch handlers includes soft reset or I need manually check kcontrol name
>>> in handler and cache values in extended private structure? The same question
>>> for switch handler, because I need to share cached values between these
>>> handlers.
>> Since the problematic registers are: 17, 18, .. 24. I would have an array
>> inside struct aic3x_priv to store the configured gain. You could store the
>> mute as well, but since regmap is caching the content I would simply read back
>> the gain value and if it is 0xf, it is muted, so update only the local shadow,
>> if it is not muted, write the gain.
>> In the mute/unmute controls I would then save the gain to shadow when muting
>> the path and write the cached gain to the register when unmuting it. You
>> should also return correct 0/1 for the unmute state and not the actual
>> register value.

your mail client does not seem to wrap the lines correctly, can you check that.

> Actually I try to avoid complex handler, with switch-case which depends on reg
> number or kcontrol name inside of it.
> I have found similar discussion with you about one year ago here
> http://mailman.alsa-project.org/pipermail/alsa-devel/2015-February/087430.html. There
> is a proposal to use TLV_DB_RANGE_HEAD() and TLV_DB_SCALE_ITEM() because of
> invert with SOC_DAPM_SINGLE_TLV.

As I recall there were some issues with that back then, but can not recall. At
least I don't see followup patches regarding to that.

> As I understand we could make tlv with using
> 0 as mute, skip values 1-6, use values 7-15 (7 = -12dB and 15=0dB) then
> declare SOC_DAPM_SINGLE_TLV as "Line1L Volume" for example. Is it still
> actual?

Worth a try ;)
The naming needs to be different, take a look at twl4030 codec's
twl4030_dapm_dbypass_tlv and how it is used.

> Few things which I didn't understand:
> - should I use "Line1L Switch" together with "Line1L Volume" in this case. I
> think no, because DAPM_SINGLE_TLV should replace switch.

Since we will have the gain and mute with volume control we will have only one
control.

> - i don't understand how declare tlv with skipping values 1-6

Yeah, I'm not sure how leaving 'hole' between the TLV_DB_SCALE_ITEMs will be
handled if it works.

> 
> Cheers, Tim


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