ASoC: spdif: Add codec driver to use spdif stand-alone

This patch adds spdif dummy codec driver for using spdif-dit as
a stand-alone. Until this, spdif-dit can be used only with other
codecs like tlv320aci3x in davinci platform.

Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 92 insertions, 1 deletions

diff --git a/sound/soc/codecs/spdif_transciever.c b/sound/soc/codecs/spdif_transciever.c
index a63191141052..f0945ab2002e 100644
--- a/sound/soc/codecs/spdif_transciever.c
+++ b/sound/soc/codecs/spdif_transciever.c
@@ -18,6 +18,7 @@
 #include <linux/moduleparam.h>
 #include <sound/soc.h>
 #include <sound/pcm.h>
+#include <sound/initval.h>
 
 #include "spdif_transciever.h"
 
@@ -26,6 +27,48 @@ MODULE_LICENSE("GPL");
 #define STUB_RATES      SNDRV_PCM_RATE_8000_96000
 #define STUB_FORMATS    SNDRV_PCM_FMTBIT_S16_LE
 
+static struct snd_soc_codec *spdif_dit_codec;
+
+static int spdif_dit_codec_probe(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec;
+        int ret;
+
+        if (spdif_dit_codec == NULL) {
+                dev_err(&pdev->dev, "Codec device not registered\n");
+                return -ENODEV;
+        }
+
+        socdev->card->codec = spdif_dit_codec;
+        codec = spdif_dit_codec;
+
+        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+        if (ret < 0) {
+                dev_err(codec->dev, "failed to create pcms: %d\n", ret);
+                goto err_create_pcms;
+        }
+
+        return 0;
+
+err_create_pcms:
+        return ret;
+}
+
+static int spdif_dit_codec_remove(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+
+        snd_soc_free_pcms(socdev);
+
+        return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_spdif_dit = {
+        .probe          = spdif_dit_codec_probe,
+        .remove         = spdif_dit_codec_remove,
+}; EXPORT_SYMBOL_GPL(soc_codec_dev_spdif_dit);
+
 struct snd_soc_dai dit_stub_dai = {
         .name           = "DIT",
         .playback       = {
@@ -40,13 +83,61 @@ EXPORT_SYMBOL_GPL(dit_stub_dai);
 
 static int spdif_dit_probe(struct platform_device *pdev)
 {
+        struct snd_soc_codec *codec;
+        int ret;
+
+        if (spdif_dit_codec) {
+                dev_err(&pdev->dev, "Another Codec is registered\n");
+                ret = -EINVAL;
+                goto err_reg_codec;
+        }
+
+        codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+        if (codec == NULL)
+                return -ENOMEM;
+
+        codec->dev = &pdev->dev;
+
+        mutex_init(&codec->mutex);
+
+        INIT_LIST_HEAD(&codec->dapm_widgets);
+        INIT_LIST_HEAD(&codec->dapm_paths);
+
+        codec->name = "spdif-dit";
+        codec->owner = THIS_MODULE;
+        codec->dai = &dit_stub_dai;
+        codec->num_dai = 1;
+
+        spdif_dit_codec = codec;
+
+        ret = snd_soc_register_codec(codec);
+        if (ret < 0) {
+                dev_err(codec->dev, "Failed to register codec: %d\n", ret);
+                goto err_reg_codec;
+        }
+
         dit_stub_dai.dev = &pdev->dev;
-        return snd_soc_register_dai(&dit_stub_dai);
+        ret = snd_soc_register_dai(&dit_stub_dai);
+        if (ret < 0) {
+                dev_err(codec->dev, "Failed to register dai: %d\n", ret);
+                goto err_reg_dai;
+        }
+
+        return 0;
+
+err_reg_dai:
+        snd_soc_unregister_codec(codec);
+err_reg_codec:
+        kfree(spdif_dit_codec);
+        return ret;
 }
 
 static int spdif_dit_remove(struct platform_device *pdev)
 {
         snd_soc_unregister_dai(&dit_stub_dai);
+        snd_soc_unregister_codec(spdif_dit_codec);
+        kfree(spdif_dit_codec);
+        spdif_dit_codec = NULL;
         return 0;
 }