Add support for PA gpio pin for controlling an external amplifier as used
on some Allwinner boards.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
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@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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