3 files changed, 177 insertions, 0 deletions
diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 3368ace60977..398f00208678 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -1,3 +1,6 @@
+config SND_SOC_OF_SIMPLE
+	tristate
+
 config SND_SOC_MPC8610
 	bool "ALSA SoC support for the MPC8610 SOC"
 	depends on MPC8610_HPCD
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index 62f680a4a776..aa2100b41146 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -1,3 +1,6 @@
+# Simple machine driver that extracts configuration from the OF device tree
+obj-$(CONFIG_SND_SOC_OF_SIMPLE) += soc-of-simple.o
+
 # MPC8610 HPCD Machine Support
 obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += mpc8610_hpcd.o
 
diff --git a/sound/soc/fsl/soc-of-simple.c b/sound/soc/fsl/soc-of-simple.c
new file mode 100644
index 000000000000..0382fdac51cd
--- /dev/null
+++ b/sound/soc/fsl/soc-of-simple.c
@@ -0,0 +1,171 @@
+/*
+ * OF helpers for ALSA SoC Layer
+ *
+ * Copyright (C) 2008, Secret Lab Technologies Ltd.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-of-simple.h>
+#include <sound/initval.h>
+
+MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ALSA SoC OpenFirmware bindings");
+
+static DEFINE_MUTEX(of_snd_soc_mutex);
+static LIST_HEAD(of_snd_soc_device_list);
+static int of_snd_soc_next_index;
+
+struct of_snd_soc_device {
+	int id;
+	struct list_head list;
+	struct snd_soc_device device;
+	struct snd_soc_machine machine;
+	struct snd_soc_dai_link dai_link;
+	struct platform_device *pdev;
+	struct device_node *platform_node;
+	struct device_node *codec_node;
+};
+
+static struct snd_soc_ops of_snd_soc_ops = {
+};
+
+static struct of_snd_soc_device *
+of_snd_soc_get_device(struct device_node *codec_node)
+{
+	struct of_snd_soc_device *of_soc;
+
+	list_for_each_entry(of_soc, &of_snd_soc_device_list, list) {
+		if (of_soc->codec_node == codec_node)
+			return of_soc;
+	}
+
+	of_soc = kzalloc(sizeof(struct of_snd_soc_device), GFP_KERNEL);
+	if (!of_soc)
+		return NULL;
+
+	/* Initialize the structure and add it to the global list */
+	of_soc->codec_node = codec_node;
+	of_soc->id = of_snd_soc_next_index++;
+	of_soc->machine.dai_link = &of_soc->dai_link;
+	of_soc->machine.num_links = 1;
+	of_soc->device.machine = &of_soc->machine;
+	of_soc->dai_link.ops = &of_snd_soc_ops;
+	list_add(&of_soc->list, &of_snd_soc_device_list);
+
+	return of_soc;
+}
+
+static void of_snd_soc_register_device(struct of_snd_soc_device *of_soc)
+{
+	struct platform_device *pdev;
+	int rc;
+
+	/* Only register the device if both the codec and platform have
+	 * been registered */
+	if ((!of_soc->device.codec_data) || (!of_soc->platform_node))
+		return;
+
+	pr_info("platform<-->codec match achieved; registering machine\n");
+
+	pdev = platform_device_alloc("soc-audio", of_soc->id);
+	if (!pdev) {
+		pr_err("of_soc: platform_device_alloc() failed\n");
+		return;
+	}
+
+	pdev->dev.platform_data = of_soc;
+	platform_set_drvdata(pdev, &of_soc->device);
+	of_soc->device.dev = &pdev->dev;
+
+	/* The ASoC device is complete; register it */
+	rc = platform_device_add(pdev);
+	if (rc) {
+		pr_err("of_soc: platform_device_add() failed\n");
+		return;
+	}
+
+}
+
+int of_snd_soc_register_codec(struct snd_soc_codec_device *codec_dev,
+			      void *codec_data, struct snd_soc_dai *dai,
+			      struct device_node *node)
+{
+	struct of_snd_soc_device *of_soc;
+	int rc = 0;
+
+	pr_info("registering ASoC codec driver: %s\n", node->full_name);
+
+	mutex_lock(&of_snd_soc_mutex);
+	of_soc = of_snd_soc_get_device(node);
+	if (!of_soc) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	/* Store the codec data */
+	of_soc->device.codec_data = codec_data;
+	of_soc->device.codec_dev = codec_dev;
+	of_soc->dai_link.name = (char *)node->name;
+	of_soc->dai_link.stream_name = (char *)node->name;
+	of_soc->dai_link.codec_dai = dai;
+
+	/* Now try to register the SoC device */
+	of_snd_soc_register_device(of_soc);
+
+ out:
+	mutex_unlock(&of_snd_soc_mutex);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(of_snd_soc_register_codec);
+
+int of_snd_soc_register_platform(struct snd_soc_platform *platform,
+				 struct device_node *node,
+				 struct snd_soc_dai *cpu_dai)
+{
+	struct of_snd_soc_device *of_soc;
+	struct device_node *codec_node;
+	const phandle *handle;
+	int len, rc = 0;
+
+	pr_info("registering ASoC platform driver: %s\n", node->full_name);
+
+	handle = of_get_property(node, "codec-handle", &len);
+	if (!handle || len < sizeof(handle))
+		return -ENODEV;
+	codec_node = of_find_node_by_phandle(*handle);
+	if (!codec_node)
+		return -ENODEV;
+	pr_info("looking for codec: %s\n", codec_node->full_name);
+
+	mutex_lock(&of_snd_soc_mutex);
+	of_soc = of_snd_soc_get_device(codec_node);
+	if (!of_soc) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	of_soc->platform_node = node;
+	of_soc->dai_link.cpu_dai = cpu_dai;
+	of_soc->device.platform = platform;
+	of_soc->machine.name = of_soc->dai_link.cpu_dai->name;
+
+	/* Now try to register the SoC device */
+	of_snd_soc_register_device(of_soc);
+
+ out:
+	mutex_unlock(&of_snd_soc_mutex);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(of_snd_soc_register_platform);