ASoC: sun4i-codec: Add support for PA gpio pin

Add support for PA gpio pin for controlling an external amplifier as used
on some Allwinner boards.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/sun4i-codec.txt b/Documentation/devicetree/bindings/sound/sun4i-codec.txt
index c92966bd5488b8b8b3032b58228ba8542d9962cb..0dce690f78f543b767c939f76a2f44641530268b 100644 (file)
--- 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@01c22c00 {
        #sound-dai-cells = <0>;

diff --git a/sound/soc/sunxi/sun4i-codec.c b/sound/soc/sunxi/sun4i-codec.c
index 519ccb3444e8d56b1de69545c65faa7f1b83de93..e6cc6a14718a45fb5a4b304fddb51103108bfc52 100644 (file)
--- 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;