[alsa-devel] [PATCH 1/2] ALSA: hda - check supported power states

[Takashi Iwai]

At Wed,  6 Jun 2012 22:02:48 +0800,
Wang Xingchao wrote:
> 
> Add function to check whether power states supported by specific
> codec node.
> 
> Signed-off-by: Wang Xingchao <xingchao.wang at intel.com>

Applied together with v2 patch.  Thanks.


Takashi

> ---
>  sound/pci/hda/hda_codec.c |   16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
> index 41ca803..b89c8ec 100644
> --- a/sound/pci/hda/hda_codec.c
> +++ b/sound/pci/hda/hda_codec.c
> @@ -3505,6 +3505,22 @@ void snd_hda_codec_set_power_to_all(struct hda_codec *codec, hda_nid_t fg,
>  EXPORT_SYMBOL_HDA(snd_hda_codec_set_power_to_all);
>  
>  /*
> + *  supported power states check
> + */
> +static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec, hda_nid_t fg,
> +				unsigned int power_state)
> +{
> +	int sup = snd_hda_param_read(codec, fg, AC_PAR_POWER_STATE);
> +
> +	if (sup < 0)
> +		return false;
> +	if (sup & power_state)
> +		return true;
> +	else
> +		return false;
> +}
> +
> +/*
>   * set power state of the codec
>   */
>  static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,
> -- 
> 1.7.9.5
>