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Subject[PATCH] ASoC: simple-card: add bindings for amplifier support
Date
From: Pierluigi Passaro <pierluigi.p@variscite.com>

Add an optional property 'pa-gpios' for controlling external amplifier,
which depends on DAPM widgets and routing.

Signed-off-by: Pierluigi Passaro <pierluigi.p@variscite.com>
Signed-off-by: Alifer Moraes <alifer.m@variscite.com>
---
sound/soc/generic/simple-card.c | 37 +++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index a89d1cfdda32..d042be556f1b 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -10,6 +10,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/simple_card.h>
@@ -22,6 +23,33 @@
#define CELL "#sound-dai-cells"
#define PREFIX "simple-audio-card,"

+static int simple_outdrv_event(struct snd_soc_dapm_widget *w,
+ struct snd_kcontrol *kcontrol,
+ int event)
+{
+ struct snd_soc_dapm_context *dapm = w->dapm;
+ struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);
+
+ switch (event) {
+ case SND_SOC_DAPM_POST_PMU:
+ gpiod_set_value_cansleep(priv->pa_gpio, 1);
+ break;
+ case SND_SOC_DAPM_PRE_PMD:
+ gpiod_set_value_cansleep(priv->pa_gpio, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dapm_widget simple_dapm_widgets[] = {
+ SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
+ 0, 0, NULL, 0, simple_outdrv_event,
+ SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
+};
+
static const struct snd_soc_ops simple_ops = {
.startup = asoc_simple_startup,
.shutdown = asoc_simple_shutdown,
@@ -620,6 +648,8 @@ static int asoc_simple_probe(struct platform_device *pdev)
card = simple_priv_to_card(priv);
card->owner = THIS_MODULE;
card->dev = dev;
+ card->dapm_widgets = simple_dapm_widgets;
+ card->num_dapm_widgets = ARRAY_SIZE(simple_dapm_widgets);
card->probe = simple_soc_probe;
card->driver_name = "simple-card";

@@ -638,6 +668,13 @@ static int asoc_simple_probe(struct platform_device *pdev)
if (ret < 0)
return ret;

+ priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
+ if (IS_ERR(priv->pa_gpio)) {
+ ret = PTR_ERR(priv->pa_gpio);
+ dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
+ return ret;
+ }
+
if (np && of_device_is_available(np)) {

ret = simple_parse_of(priv, li);
--
2.25.1
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