On Fri, Jan 31, 2014 at 1:43 PM, eze_rg <[email protected]> wrote:
> Hello people, i'm trying to interface the Wolfson wm8782 ADC with my BB
> Black.
> My first approach was modify the file davinci-evm.c, so the kernel will
> load the wm8782 driver instead of the tdax998 (used for hdmi).
> The first problem that i'm facing is that i dont know exactly where apply
> these changes, so far i see two options:
>
> here:
>
> case MACHINE_VERSION_3:
> evm_dai.name = "NXP TDA HDMI Chip";
> evm_dai.stream_name = "HDMI";
> evm_dai.codec_dai_name = "wm8782-hifi";
> evm_dai.init = evm_tda998x_init;
>
> or here:
>
> static struct snd_soc_dai_link da830_evm_dai = {
> .name = "wm8782",
> .stream_name = "Capture",
> .cpu_dai_name = "davinci-mcasp.0",
> .codec_dai_name = "wm8782-hifi",
> .codec_name = "wm8782-codec.0-0018",
> .platform_name = "davinci-mcasp.0",
> .init = evm_aic3x_init,
> .ops = &evm_ops,
>
>
This portion is for a different platform - notice the struct name is
'da830_evm_dai'.
If it's just the codec change then setting the right codec_name and
ensuring the appropriate driver
is compiled in should have been sufficient.
I think that the code in the first option only gets executed when the dtbo
> file "cape-boneblack-hdmi" is loaded (is this correct?),
> but neither of these options seems to work...
>
> The only "solution" that i came up with was replacing the code of the
> tda998x.c with the code of wm8782.c driver, but i don't
> think this is the right way...
>
> Yeah it's not :)
>
> The files that i think would do the trick are: *davinci-evm.c*, *wm8782.c*and
> *board-am3517evm.c* but, obvioulsy, i'm not sure of this...
>
The board file (board-am3517evm.c) is for yet another platform which is not
relevant here.
You should be looking at the device tree files now.
I *think* the codec driver won't need any change. You might have to make
some changes in davinci-evm.c though.
The last time i checked there were patches on the ALSA mailing list to have
most of the configuration coming via appropriate DT-bindings. I don't know
what kernel you are running but hopefully the above is enough for you to
start
looking around.
--
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