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);