[alsa-devel] [PATCH v11 3/8] ASoC: generic: simple DT sound card
Markus Pargmann
mpa at pengutronix.de
Mon Aug 19 17:05:56 CEST 2013
Simple sound card initialized using DT. When used with AC97, ac97-codec
is used to automatically discover the used codec.
Signed-off-by: Markus Pargmann <mpa at pengutronix.de>
---
.../bindings/sound/generic,simple-dt-card.txt | 28 ++++
sound/soc/generic/Kconfig | 1 +
sound/soc/generic/Makefile | 3 +-
sound/soc/generic/simple-dt-card.c | 186 +++++++++++++++++++++
4 files changed, 217 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/sound/generic,simple-dt-card.txt
create mode 100644 sound/soc/generic/simple-dt-card.c
diff --git a/Documentation/devicetree/bindings/sound/generic,simple-dt-card.txt b/Documentation/devicetree/bindings/sound/generic,simple-dt-card.txt
new file mode 100644
index 0000000..189d754
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/generic,simple-dt-card.txt
@@ -0,0 +1,28 @@
+Simple DT card
+
+A simple generic driver that connects a CPU DAI with a CODEC.
+
+Required properties:
+ - compatible: "asoc-simple-dt-card" used for standard ssi, codec
+ combinations, or "asoc-simple-ac97-dt-card" to use ac97 to discover the
+ codec.
+ - cpu-dai: CPU DAI connected to the codec.
+
+Required properties for "asoc-simple-dt-card":
+ - audio-codec: Codec phandle.
+ - codec-dai-name: DAI name within the codec.
+
+Examples:
+
+sound {
+ compatible = "asoc-simple-dt-card";
+ cpu-dai = <&ssi1>;
+ audio-codec = <&wm9712>;
+};
+
+For AC97:
+
+sound {
+ compatible = "asoc-simple-ac97-dt-card";
+ cpu-dai = <&ssi1>;
+};
diff --git a/sound/soc/generic/Kconfig b/sound/soc/generic/Kconfig
index 610f612..8718ac6 100644
--- a/sound/soc/generic/Kconfig
+++ b/sound/soc/generic/Kconfig
@@ -1,4 +1,5 @@
config SND_SIMPLE_CARD
tristate "ASoC Simple sound card support"
+ select SND_SOC_AC97_BUS
help
This option enables generic simple sound card support
diff --git a/sound/soc/generic/Makefile b/sound/soc/generic/Makefile
index 9c3b246..9ccf864 100644
--- a/sound/soc/generic/Makefile
+++ b/sound/soc/generic/Makefile
@@ -1,3 +1,4 @@
snd-soc-simple-card-objs := simple-card.o
+snd-soc-simple-dt-card-objs := simple-dt-card.o
-obj-$(CONFIG_SND_SIMPLE_CARD) += snd-soc-simple-card.o
+obj-$(CONFIG_SND_SIMPLE_CARD) += snd-soc-simple-card.o snd-soc-simple-dt-card.o
diff --git a/sound/soc/generic/simple-dt-card.c b/sound/soc/generic/simple-dt-card.c
new file mode 100644
index 0000000..532be0f
--- /dev/null
+++ b/sound/soc/generic/simple-dt-card.c
@@ -0,0 +1,186 @@
+/*
+ * phycore-ac97-dt.c -- SoC audio for imx_phycore in AC97 mode
+ *
+ * Copyright 2013 Markus Pargmann, Pengutronix <mpa at pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+
+struct simple_dt_card_data {
+ struct snd_soc_dai_link link;
+ struct snd_soc_card card;
+ struct device_node *cpu_np;
+ struct device_node *codec_np;
+ struct platform_device *ac97_codec;
+};
+
+static struct snd_soc_dai_link simple_ac97_dt_card_dai = {
+ .name = "HiFi",
+ .stream_name = "HiFi",
+ .codec_dai_name = "ac97-hifi",
+ .codec_name = "ac97-codec",
+};
+
+static const struct snd_soc_card simple_ac97_dt_card = {
+ .name = "ASoC simple AC97 DT card",
+ .owner = THIS_MODULE,
+};
+
+static struct snd_soc_dai_link simple_dt_card_dai = {
+ .name = "simple-link",
+ .stream_name = "simple-link",
+};
+
+static const struct snd_soc_card simple_dt_card = {
+ .name = "ASoC simple DT card",
+ .owner = THIS_MODULE,
+};
+
+enum simple_dt_card_type {
+ SIMPLE_CARD,
+ SIMPLE_CARD_AC97,
+};
+
+static const struct of_device_id simple_dt_card_of_dev_ids[] = {
+ {
+ .compatible = "asoc-simple-dt-card",
+ .data = (void *)SIMPLE_CARD,
+ }, {
+ .compatible = "asoc-simple-ac97-dt-card",
+ .data = (void *)SIMPLE_CARD_AC97,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, simple_dt_card_of_dev_id);
+
+static int simple_dt_card_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *of_id =
+ of_match_device(simple_dt_card_of_dev_ids, &pdev->dev);
+ enum simple_dt_card_type type = (enum simple_dt_card_type)of_id->data;
+ int ret;
+ struct simple_dt_card_data *priv;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+
+ if (!priv)
+ return -ENOMEM;
+
+ priv->card.dev = &pdev->dev;
+
+ priv->cpu_np = of_parse_phandle(pdev->dev.of_node, "cpu-dai", 0);
+ if (!priv->cpu_np) {
+ dev_err(&pdev->dev, "No valid CPU DAI phandle found\n");
+ return -EINVAL;
+ }
+
+ if (type == SIMPLE_CARD_AC97) {
+ struct platform_device *ac97_codec;
+ memcpy(&priv->card, &simple_ac97_dt_card,
+ sizeof(simple_ac97_dt_card));
+ memcpy(&priv->link, &simple_ac97_dt_card_dai,
+ sizeof(simple_ac97_dt_card_dai));
+
+ ac97_codec = platform_device_register_simple("ac97-codec", -1,
+ NULL, 0);
+ if (IS_ERR(ac97_codec)) {
+ dev_err(&pdev->dev, "Failed to register ac97-codec device\n");
+ ret = PTR_ERR(priv->ac97_codec);
+ goto err;
+ }
+ priv->ac97_codec = ac97_codec;
+ } else {
+ priv->codec_np = of_parse_phandle(pdev->dev.of_node,
+ "audio-codec", 0);
+ if (!priv->codec_np) {
+ dev_err(&pdev->dev, "No valid codec phandle found\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ memcpy(&priv->link, &simple_dt_card_dai,
+ sizeof(simple_dt_card_dai));
+ memcpy(&priv->card, &simple_dt_card, sizeof(simple_dt_card));
+ priv->link.codec_of_node = priv->codec_np;
+
+ ret = of_property_read_string(pdev->dev.of_node,
+ "codec-dai-name", &priv->link.stream_name);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to parse codec-dai-name string\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ }
+
+ priv->link.cpu_of_node = priv->cpu_np;
+ priv->link.platform_of_node = priv->cpu_np;
+
+ priv->card.dai_link = &priv->link;
+ priv->card.num_links = 1;
+ priv->card.dev = &pdev->dev;
+
+ ret = snd_soc_register_card(&priv->card);
+ if (ret) {
+ dev_err(&pdev->dev, "ASoC: soc card registration failed\n");
+ goto err;
+ }
+
+ dev_set_drvdata(&pdev->dev, priv);
+
+ return 0;
+
+err:
+ if (priv->cpu_np)
+ of_node_put(priv->cpu_np);
+ if (priv->codec_np)
+ of_node_put(priv->codec_np);
+ if (priv->ac97_codec)
+ platform_device_unregister(priv->ac97_codec);
+ return ret;
+}
+
+static int simple_dt_card_remove(struct platform_device *pdev)
+{
+ struct simple_dt_card_data *priv = dev_get_drvdata(&pdev->dev);
+
+ snd_soc_unregister_card(&priv->card);
+
+ if (priv->cpu_np)
+ of_node_put(priv->cpu_np);
+ if (priv->codec_np)
+ of_node_put(priv->codec_np);
+ if (priv->ac97_codec)
+ platform_device_unregister(priv->ac97_codec);
+
+ return 0;
+}
+
+static struct platform_driver simple_dt_card_driver = {
+ .probe = simple_dt_card_probe,
+ .remove = simple_dt_card_remove,
+ .driver = {
+ .name = "asoc-simple-dt-card",
+ .owner = THIS_MODULE,
+ .of_match_table = simple_dt_card_of_dev_ids,
+ },
+};
+
+module_platform_driver(simple_dt_card_driver);
+
+MODULE_AUTHOR("Markus Pargmann <mpa at pengutronix.de>");
+MODULE_DESCRIPTION("ASoC Simple DT Sound Card");
+MODULE_LICENSE("GPL");
--
1.8.4.rc3
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