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authorShawn Guo <shawn.guo@linaro.org>2017-06-29 21:26:38 +0800
committerMark Brown <broonie@kernel.org>2017-06-30 12:37:08 +0100
commitf986907c9225cf48e9a55233b086039152bb5b99 (patch)
tree318aaeeef390f794398034af2b7c4cecb8980b04
parenta0c683d734e0b3589892c17d0e1187f20d2c3a54 (diff)
downloadlinux-f986907c9225cf48e9a55233b086039152bb5b99.tar.bz2
ASoC: audio-graph-card: add widgets and routing for external amplifier support
It's very common that audio card has a machine level amplifier which is controlled by GPIO. The patch adds DAPM widgets and routing support into audio-graph-card driver, and creates an output driver widget with event to control the amplifier via GPIO. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--sound/soc/generic/audio-graph-card.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
index ee752f62d89d..105ec3a6e30d 100644
--- a/sound/soc/generic/audio-graph-card.c
+++ b/sound/soc/generic/audio-graph-card.c
@@ -13,6 +13,7 @@
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -30,6 +31,34 @@ struct graph_card_data {
struct asoc_simple_dai codec_dai;
} *dai_props;
struct snd_soc_dai_link *dai_link;
+ struct gpio_desc *pa_gpio;
+};
+
+static int asoc_graph_card_outdrv_event(struct snd_soc_dapm_widget *w,
+ struct snd_kcontrol *kcontrol,
+ int event)
+{
+ struct snd_soc_dapm_context *dapm = w->dapm;
+ struct graph_card_data *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 asoc_graph_card_dapm_widgets[] = {
+ SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
+ 0, 0, NULL, 0, asoc_graph_card_outdrv_event,
+ SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};
#define graph_priv_to_card(priv) (&(priv)->snd_card)
@@ -180,8 +209,16 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
int rc, idx = 0;
int ret;
+ ret = asoc_simple_card_of_parse_widgets(card, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = asoc_simple_card_of_parse_routing(card, NULL, 1);
+ if (ret < 0)
+ return ret;
+
/*
- * we need to consider "widgets", "routing", "mclk-fs" around here
+ * we need to consider "mclk-fs" around here
* see simple-card
*/
@@ -233,6 +270,13 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
if (!dai_props || !dai_link)
return -ENOMEM;
+ 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;
+ }
+
priv->dai_props = dai_props;
priv->dai_link = dai_link;
@@ -242,6 +286,8 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
card->dev = dev;
card->dai_link = dai_link;
card->num_links = num;
+ card->dapm_widgets = asoc_graph_card_dapm_widgets;
+ card->num_dapm_widgets = ARRAY_SIZE(asoc_graph_card_dapm_widgets);
ret = asoc_graph_card_parse_of(priv);
if (ret < 0) {