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Date: Sat, 20 Jul 2013 19:25:54 +0200
From: Jean-Francois Moine <moinejf@...e.fr>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
alsa-devel@...a-project.org
Subject: [PATCH] ASoC: generic: add simple card with devicetree support
This generic simple card driver uses DT values to instanciate an audio
system in which the real work is done by the subdrivers (audio
controller, audio codec and pcm/dma controller).
Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
---
Documentation/devicetree/bindings/sound/simple-dt-card.txt | 18 ++++
sound/soc/generic/Kconfig | 7 ++
sound/soc/generic/Makefile | 2 +
sound/soc/generic/simple-dt-card.c | 137 ++++++++++++++++++++++++
4 files changed, 163 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/simple-dt-card.txt b/Documentation/devicetree/bindings/sound/simple-dt-card.txt
new file mode 100644
index 0000000..45f41cc
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/simple-dt-card.txt
@@ -0,0 +1,18 @@
+Device-Tree bindings for simple DT audio card
+
+Required properties:
+ - compatible: should be "linux,simple-dt-audio".
+ - audio-controller: phandle of the audio controller
+ - audio-codec: phandle of the audio codec
+ - platform-pcm-dma: phandle of the PCM/DMA controller
+ - codec-dai-name: name of the codec dai
+
+Example node:
+
+ sound {
+ compatible = "linux,simple-dt-audio";
+ audio-controller = <&i2s1>;
+ audio-codec = <&spdif>;
+ platform-pcm-dma = <&pcm>;
+ codec-dai-name = "dit-hifi";
+ };
diff --git a/sound/soc/generic/Kconfig b/sound/soc/generic/Kconfig
index 610f612..e593224 100644
--- a/sound/soc/generic/Kconfig
+++ b/sound/soc/generic/Kconfig
@@ -2,3 +2,10 @@ config SND_SIMPLE_CARD
tristate "ASoC Simple sound card support"
help
This option enables generic simple sound card support
+
+config SND_SIMPLE_DT_CARD
+ tristate "ASoC Simple sound card support (Flattened Device Tree)"
+ depends on OF
+ help
+ This option enables generic simple sound card support
+ using flattened device tree.
diff --git a/sound/soc/generic/Makefile b/sound/soc/generic/Makefile
index 9c3b246..65ddd3e 100644
--- a/sound/soc/generic/Makefile
+++ b/sound/soc/generic/Makefile
@@ -1,3 +1,5 @@
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_DT_CARD) += 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..d373d68
--- /dev/null
+++ b/sound/soc/generic/simple-dt-card.c
@@ -0,0 +1,137 @@
+/*
+ * Simple DT defined sound card support
+ *
+ * Copyright (C) 2013 Jean-Francois Moine <moinejf@...e.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include <linux/of.h>
+
+static int simple_dt_remove(struct platform_device *pdev)
+{
+ struct snd_soc_card *card = platform_get_drvdata(pdev);
+ struct snd_soc_dai_link *link;
+
+ snd_soc_unregister_card(card);
+ link = card->dai_link;
+ if (link) {
+ of_node_put((struct device_node *) link->platform_of_node);
+ of_node_put((struct device_node *) link->codec_of_node);
+ of_node_put((struct device_node *) link->cpu_of_node);
+ kfree(link);
+ }
+ kfree(card);
+ return 0;
+}
+
+static int simple_dt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct snd_soc_card *card;
+ struct snd_soc_dai_link *link;
+ int ret;
+
+ if (!np) {
+ dev_err(dev, "no device-tree\n");
+ return -ENXIO;
+ }
+
+ card = kzalloc(sizeof *card, GFP_KERNEL);
+ if (!card) {
+ dev_err(dev, "unable to allocate soc card\n");
+ return -ENOMEM;
+ }
+ card->name = "Simple DT audio card";
+ card->owner = THIS_MODULE;
+ card->dev = dev;
+ platform_set_drvdata(pdev, card);
+
+ link = kzalloc(sizeof *link, GFP_KERNEL);
+ if (!link) {
+ dev_err(dev, "unable to allocate soc link\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+ card->dai_link = link;
+ card->num_links = 1;
+
+ link->name = "Simple audio";
+ link->stream_name = "Playback";
+
+ link->cpu_of_node = of_parse_phandle(np, "audio-controller", 0);
+ if (!link->cpu_of_node) {
+ dev_err(dev, "no 'audio-controller' in DT\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ link->codec_of_node = of_parse_phandle(np, "audio-codec", 0);
+ if (!link->codec_of_node) {
+ dev_err(dev, "no 'audio-codec' in DT\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ link->platform_of_node = of_parse_phandle(np, "platform-pcm-dma", 0);
+ if (!link->platform_of_node) {
+ dev_err(dev, "no 'platform-pcm-dma' in DT\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = of_property_read_string(np, "codec-dai-name",
+ &link->codec_dai_name);
+ if (ret) {
+ dev_err(dev, "no 'codec-dai-name' in DT\n");
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = snd_soc_register_card(card);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "register card err %d\n", ret);
+ goto err;
+ }
+ return 0;
+
+err:
+ simple_dt_remove(pdev);
+ return ret;
+}
+
+static struct of_device_id simple_dt_of_match[] = {
+ { .compatible = "linux,simple-dt-audio" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, simple_dt_of_match);
+
+static struct platform_driver simple_dt_driver = {
+ .driver = {
+ .name = "simple-dt-audio",
+ .owner = THIS_MODULE,
+ .of_match_table = simple_dt_of_match,
+ },
+ .probe = simple_dt_probe,
+ .remove = simple_dt_remove,
+};
+module_platform_driver(simple_dt_driver);
+
+MODULE_AUTHOR("Jean-Francois Moine <moinejf@...e.fr>");
+MODULE_DESCRIPTION("ALSA SoC simple DT driver");
+MODULE_LICENSE("GPL");
--
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