[alsa-devel] [PATCH v2 2/4] ASoC: sun4i-codec: Add support for PA gpio pin

[Rob Herring]

On Fri, Dec 11, 2015 at 07:43:57PM +0100, Hans de Goede wrote:
> Add support for PA gpio pin for controlling an external amplifier as used
> on some Allwinner boards.
> 
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>

Acked-by: Rob Herring <robh at kernel.org>

> ---
> Changes in v2:
> -Use a dapm speaker widget (SND_SOC_DAPM_SPK) to control the gpio
> -Rename gpio in devicetree from pa-gpios to allwinner,pa-gpios
> ---
>  .../devicetree/bindings/sound/sun4i-codec.txt      |  3 ++
>  sound/soc/sunxi/sun4i-codec.c                      | 35 ++++++++++++++++++++++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/sound/sun4i-codec.txt b/Documentation/devicetree/bindings/sound/sun4i-codec.txt
> index c92966b..0dce690 100644
> --- a/Documentation/devicetree/bindings/sound/sun4i-codec.txt
> +++ b/Documentation/devicetree/bindings/sound/sun4i-codec.txt
> @@ -14,6 +14,9 @@ Required properties:
>     - "apb": the parent APB clock for this controller
>     - "codec": the parent module clock
>  
> +Optional properties:
> +- allwinner,pa-gpios: gpio to enable external amplifier
> +
>  Example:
>  codec: codec at 01c22c00 {
>  	#sound-dai-cells = <0>;
> diff --git a/sound/soc/sunxi/sun4i-codec.c b/sound/soc/sunxi/sun4i-codec.c
> index 519ccb3..e6cc6a1 100644
> --- a/sound/soc/sunxi/sun4i-codec.c
> +++ b/sound/soc/sunxi/sun4i-codec.c
> @@ -28,6 +28,7 @@
>  #include <linux/of_address.h>
>  #include <linux/clk.h>
>  #include <linux/regmap.h>
> +#include <linux/gpio/consumer.h>
>  
>  #include <sound/core.h>
>  #include <sound/pcm.h>
> @@ -103,6 +104,7 @@ struct sun4i_codec {
>  	struct regmap	*regmap;
>  	struct clk	*clk_apb;
>  	struct clk	*clk_module;
> +	struct gpio_desc *gpio_pa;
>  
>  	struct snd_dmaengine_dai_dma_data	capture_dma_data;
>  	struct snd_dmaengine_dai_dma_data	playback_dma_data;
> @@ -709,6 +711,26 @@ static struct snd_soc_dai_link *sun4i_codec_create_link(struct device *dev,
>  	return link;
>  };
>  
> +static int sun4i_codec_spk_event(struct snd_soc_dapm_widget *w,
> +				 struct snd_kcontrol *k, int event)
> +{
> +	struct sun4i_codec *scodec = snd_soc_card_get_drvdata(w->dapm->card);
> +
> +	if (scodec->gpio_pa)
> +		gpiod_set_value_cansleep(scodec->gpio_pa,
> +					 !!SND_SOC_DAPM_EVENT_ON(event));
> +
> +	return 0;
> +}
> +
> +static const struct snd_soc_dapm_widget sun4i_codec_card_dapm_widgets[] = {
> +	SND_SOC_DAPM_SPK("Speaker", sun4i_codec_spk_event),
> +};
> +
> +static const struct snd_soc_dapm_route sun4i_codec_card_dapm_routes[] = {
> +	{ "Speaker", NULL, "Power Amplifier" },
> +};
> +
>  static struct snd_soc_card *sun4i_codec_create_card(struct device *dev)
>  {
>  	struct snd_soc_card *card;
> @@ -723,6 +745,10 @@ static struct snd_soc_card *sun4i_codec_create_card(struct device *dev)
>  
>  	card->dev		= dev;
>  	card->name		= "sun4i-codec";
> +	card->dapm_widgets	= sun4i_codec_card_dapm_widgets;
> +	card->num_dapm_widgets	= ARRAY_SIZE(sun4i_codec_card_dapm_widgets);
> +	card->dapm_routes	= sun4i_codec_card_dapm_routes;
> +	card->num_dapm_routes	= ARRAY_SIZE(sun4i_codec_card_dapm_routes);
>  
>  	return card;
>  };
> @@ -774,6 +800,15 @@ static int sun4i_codec_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> +	scodec->gpio_pa = devm_gpiod_get_optional(&pdev->dev, "allwinner,pa",
> +						  GPIOD_OUT_LOW);
> +	if (IS_ERR(scodec->gpio_pa)) {
> +		ret = PTR_ERR(scodec->gpio_pa);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "Failed to get pa gpio: %d\n", ret);
> +		return ret;
> +	}
> +
>  	/* DMA configuration for TX FIFO */
>  	scodec->playback_dma_data.addr = res->start + SUN4I_CODEC_DAC_TXDATA;
>  	scodec->playback_dma_data.maxburst = 4;
> -- 
> 2.5.0
> 
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