Re: [alsa-devel] [PATCH 1/3] ASoC: Add ADAV80x codec driver

[Liam Girdwood <lrg@ti.com>]

On 23/06/11 07:00, Lars-Peter Clausen wrote:
> This patch adds support for the Analog Devices ADAV801 and ADAV803 audio codec.
> 
> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
> 
> ---
> Changes since v1:
> * Sync register on resume
> * Don't use arrays for the mux enums and controls
> * Rework PLL handling. Use DAPM for powering the PLL and OSC down and use
>   set_sysclk to select the system clock instead of doing this implicitly in
>   set_pll.
> ---
>  MAINTAINERS                |    1 +
>  sound/soc/codecs/Kconfig   |    4 +
>  sound/soc/codecs/Makefile  |    2 +
>  sound/soc/codecs/adav80x.c |  908 ++++++++++++++++++++++++++++++++++++++++++++
>  sound/soc/codecs/adav80x.h |   31 ++
>  5 files changed, 946 insertions(+), 0 deletions(-)
>  create mode 100644 sound/soc/codecs/adav80x.c
>  create mode 100644 sound/soc/codecs/adav80x.h
> 

snip

> +
> +static int adav80x_probe(struct snd_soc_codec *codec)
> +{
> +       int ret;
> +       struct adav80x *adav80x = snd_soc_codec_get_drvdata(codec);
> +
> +       ret = snd_soc_codec_set_cache_io(codec, 7, 9, adav80x->control_type);
> +       if (ret) {
> +               dev_err(codec->dev, "failed to set cache I/O: %d\n", ret);
> +               return ret;
> +       }
> +
> +       /* Power down SYSCLK output, power down S/PDIF receiver */
> +       snd_soc_write(codec, ADAV80X_PLL_OUTE, 0x27);
> +       /* Disable DAC zero flag */
> +       snd_soc_write(codec, ADAV80X_DAC_CTRL3, 0x6);
> +
> +       return adav80x_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
> +}
> +

It's usually better disable things like sysclk output in your machine driver as others may depend on it for probing.

Liam