[alsa-devel] [PATCH 3/5] HDA: add support for analog loopback to STAC9204/9205/922x/927x

[Takashi Iwai]

At Tue, 28 Aug 2007 05:08:02 +0300,
Maxim Levitsky wrote:
> 
> From 204b216691b2d74e100bc321654ddadd2ff710af Mon Sep 17 00:00:00 2001
> From: Maxim Levitsky <maximlevitsky at gmail.com>
> Date: Tue, 28 Aug 2007 01:06:00 +0300
> Subject: [PATCH] HDA: add support for analog loopback to STAC9204/9205/922x/927x
> 
> ---
>  sound/pci/hda/patch_sigmatel.c |   59 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 59 insertions(+), 0 deletions(-)
> 
> diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
> index 12b318e..a1f55d1 100644
> --- a/sound/pci/hda/patch_sigmatel.c
> +++ b/sound/pci/hda/patch_sigmatel.c
> @@ -128,6 +128,7 @@ struct sigmatel_spec {
>  	/* i/o switches */
>  	unsigned int io_switch[2];
>  	unsigned int clfe_swap;
> +	unsigned int aloopback;
>  
>  	struct hda_pcm pcm_rec[2];	/* PCM information */
>  
> @@ -277,6 +278,50 @@ static int stac92xx_mux_enum_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
>  				     spec->mux_nids[adc_idx], &spec->cur_mux[adc_idx]);
>  }
>  
> +static int stac92xx_aloopback_info(struct snd_kcontrol *kcontrol,
> +	struct snd_ctl_elem_info *uinfo)
> +{
> +	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
> +	uinfo->count = 1;
> +	uinfo->value.integer.min = 0;
> +	uinfo->value.integer.max = 1;
> +	return 0;
> +}

Use snd_ctl_boolean_mono_info().

> +static int stac92xx_aloopback_get(struct snd_kcontrol *kcontrol,
> +	struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
> +	struct sigmatel_spec *spec = codec->spec;
> +
> +	ucontrol->value.integer.value[0] = spec->aloopback;
> +	return 0;
> +}
> +
> +static int stac92xx_aloopback_put(struct snd_kcontrol *kcontrol,
> +		struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
> +	struct sigmatel_spec *spec = codec->spec;
> +	unsigned int dac_mode;
> +
> +	spec->aloopback = ucontrol->value.integer.value[0];
> +
> +	dac_mode = snd_hda_codec_read(codec, codec->afg, 0,
> +		kcontrol->private_value & 0xFFFF, 0x0);
> +
> +	if (spec->aloopback)
> +		dac_mode |= 0x40;
> +	else
> +		dac_mode &= ~0x40;
> +
> +	snd_hda_codec_write(codec, codec->afg, 0,
> +		kcontrol->private_value >> 16, dac_mode);
> +
> +	return 1;
> +}

Check the value change, and use snd_hda_codec_write_cache().



Takashi