[alsa-devel] [PATCH 1/3] ASoC: dapm: Add support for virtual mixer controls

[Peter Ujfalusi]

On 10/06/2013 02:43 PM, Lars-Peter Clausen wrote:
> This patch adds support for virtual DAPM mixer controls. They are similar to
> virtual DAPM enums. There is no hardware register backing the control, so
> changing the control's value wont have any direct effect on the hardware. But it
> still influences the DAPM graph by causing the path it sits on to be connected
> or disconnected. This in turn can cause power changes for some of the widgets on
> the DAPM graph, which will then modify the hardware state.

Tested-by: Peter Ujfalusi <peter.ujfalusi at ti.com>

> 
> Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
> ---
>  include/sound/soc-dapm.h |  4 ++++
>  include/sound/soc.h      |  3 ++-
>  sound/soc/soc-dapm.c     | 45 +++++++++++++++++++++++++++------------------
>  3 files changed, 33 insertions(+), 19 deletions(-)
> 
> diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
> index 27a72d5..2037c45 100644
> --- a/include/sound/soc-dapm.h
> +++ b/include/sound/soc-dapm.h
> @@ -286,6 +286,8 @@ struct device;
>  	.info = snd_soc_info_volsw, \
>  	.get = snd_soc_dapm_get_volsw, .put = snd_soc_dapm_put_volsw, \
>  	.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 1) }
> +#define SOC_DAPM_SINGLE_VIRT(xname, max) \
> +	SOC_DAPM_SINGLE(xname, SND_SOC_NOPM, 0, max, 0)
>  #define SOC_DAPM_SINGLE_TLV(xname, reg, shift, max, invert, tlv_array) \
>  {	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
>  	.info = snd_soc_info_volsw, \
> @@ -300,6 +302,8 @@ struct device;
>  	.tlv.p = (tlv_array), \
>  	.get = snd_soc_dapm_get_volsw, .put = snd_soc_dapm_put_volsw, \
>  	.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
> +#define SOC_DAPM_SINGLE_TLV_VIRT(xname, max, tlv_array) \
> +	SOC_DAPM_SINGLE(xname, SND_SOC_NOPM, 0, max, 0, tlv_array)
>  #define SOC_DAPM_ENUM(xname, xenum) \
>  {	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
>  	.info = snd_soc_info_enum_double, \
> diff --git a/include/sound/soc.h b/include/sound/soc.h
> index 6dd329a..af1678c 100644
> --- a/include/sound/soc.h
> +++ b/include/sound/soc.h
> @@ -1049,7 +1049,8 @@ struct snd_soc_pcm_runtime {
>  /* mixer control */
>  struct soc_mixer_control {
>  	int min, max, platform_max;
> -	unsigned int reg, rreg, shift, rshift;
> +	int reg, rreg;
> +	unsigned int shift, rshift;
>  	unsigned int invert:1;
>  	unsigned int autodisable:1;
>  };
> diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
> index c17c14c..25b9554 100644
> --- a/sound/soc/soc-dapm.c
> +++ b/sound/soc/soc-dapm.c
> @@ -499,18 +499,22 @@ static void dapm_set_path_status(struct snd_soc_dapm_widget *w,
>  		int val;
>  		struct soc_mixer_control *mc = (struct soc_mixer_control *)
>  			w->kcontrol_news[i].private_value;
> -		unsigned int reg = mc->reg;
> +		int reg = mc->reg;
>  		unsigned int shift = mc->shift;
>  		int max = mc->max;
>  		unsigned int mask = (1 << fls(max)) - 1;
>  		unsigned int invert = mc->invert;
>  
> -		val = soc_widget_read(w, reg);
> -		val = (val >> shift) & mask;
> -		if (invert)
> -			val = max - val;
> +		if (reg != SND_SOC_NOPM) {
> +			val = soc_widget_read(w, reg);
> +			val = (val >> shift) & mask;
> +			if (invert)
> +				val = max - val;
> +			p->connect = !!val;
> +		} else {
> +			p->connect = 0;
> +		}
>  
> -		p->connect = !!val;
>  	}
>  	break;
>  	case snd_soc_dapm_mux: {
> @@ -2791,7 +2795,7 @@ int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
>  	struct snd_soc_card *card = codec->card;
>  	struct soc_mixer_control *mc =
>  		(struct soc_mixer_control *)kcontrol->private_value;
> -	unsigned int reg = mc->reg;
> +	int reg = mc->reg;
>  	unsigned int shift = mc->shift;
>  	int max = mc->max;
>  	unsigned int mask = (1 << fls(max)) - 1;
> @@ -2804,7 +2808,7 @@ int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
>  			 kcontrol->id.name);
>  
>  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
> -	if (dapm_kcontrol_is_powered(kcontrol))
> +	if (dapm_kcontrol_is_powered(kcontrol) && reg != SND_SOC_NOPM)
>  		val = (snd_soc_read(codec, reg) >> shift) & mask;
>  	else
>  		val = dapm_kcontrol_get_value(kcontrol);
> @@ -2835,7 +2839,7 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
>  	struct snd_soc_card *card = codec->card;
>  	struct soc_mixer_control *mc =
>  		(struct soc_mixer_control *)kcontrol->private_value;
> -	unsigned int reg = mc->reg;
> +	int reg = mc->reg;
>  	unsigned int shift = mc->shift;
>  	int max = mc->max;
>  	unsigned int mask = (1 << fls(max)) - 1;
> @@ -2857,19 +2861,24 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
>  
>  	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
>  
> -	dapm_kcontrol_set_value(kcontrol, val);
> +	change = dapm_kcontrol_set_value(kcontrol, val);
>  
> -	mask = mask << shift;
> -	val = val << shift;
> +	if (reg != SND_SOC_NOPM) {
> +		mask = mask << shift;
> +		val = val << shift;
> +
> +		change = snd_soc_test_bits(codec, reg, mask, val);
> +	}
>  
> -	change = snd_soc_test_bits(codec, reg, mask, val);
>  	if (change) {
> -		update.kcontrol = kcontrol;
> -		update.reg = reg;
> -		update.mask = mask;
> -		update.val = val;
> +		if (reg != SND_SOC_NOPM) {
> +			update.kcontrol = kcontrol;
> +			update.reg = reg;
> +			update.mask = mask;
> +			update.val = val;
>  
> -		card->update = &update;
> +			card->update = &update;
> +		}
>  
>  		soc_dapm_mixer_update_power(card, kcontrol, connect);
>  
> 


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