ASoC: Add dummy S/PDIF codec support

McASP on DM646x can operate in DIT (S/PDIF) where no codec is needed.
This patch provides stub codec that can be used in these configurations.
On DM646x EVM the McASP1 is connected to the S/PDIF out.

Signed-off-by: Steve Chen <schen@mvista.com>
Signed-off-by: Pavel Kiryukhin <pkiryukhin@ru.mvista.com>
Signed-off-by: Naresh Medisetty <naresh@ti.com>
Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/sound/soc/codecs/spdif_transciever.c b/sound/soc/codecs/spdif_transciever.c
new file mode 100644
index 000000000000..118e976b28ac
--- /dev/null
+++ b/sound/soc/codecs/spdif_transciever.c
@@ -0,0 +1,69 @@
+/*
+ * ALSA SoC SPDIF DIT driver
+ *
+ *  This driver is used by controllers which can operate in DIT (SPDI/F) where
+ *  no codec is needed.  This file provides stub codec that can be used
+ *  in these configurations. TI DaVinci Audio controller uses this driver.
+ *
+ * Author:      Steve Chen,  <schen@mvista.com>
+ * Copyright:   (C) 2009 MontaVista Software, Inc., <source@mvista.com>
+ * Copyright:   (C) 2009  Texas Instruments, India
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <sound/soc.h>
+#include <sound/pcm.h>
+
+#define STUB_RATES      SNDRV_PCM_RATE_8000_96000
+#define STUB_FORMATS    SNDRV_PCM_FMTBIT_S16_LE
+
+
+struct snd_soc_dai dit_stub_dai = {
+        .name           = "DIT",
+        .playback       = {
+                .stream_name    = "Playback",
+                .channels_min   = 1,
+                .channels_max   = 384,
+                .rates          = STUB_RATES,
+                .formats        = STUB_FORMATS,
+        },
+};
+
+static int spdif_dit_probe(struct platform_device *pdev)
+{
+        return snd_soc_register_dai(&dit_stub_dai);
+}
+
+static int spdif_dit_remove(struct platform_device *pdev)
+{
+        snd_soc_unregister_dai(&dit_stub_dai);
+        return 0;
+}
+
+static struct platform_driver spdif_dit_driver = {
+        .probe          = spdif_dit_probe,
+        .remove         = spdif_dit_remove,
+        .driver         = {
+                .name   = "spdif-dit",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init dit_modinit(void)
+{
+        return platform_driver_register(&spdif_dit_driver);
+}
+
+static void __exit dit_exit(void)
+{
+        platform_driver_unregister(&spdif_dit_driver);
+}
+
+module_init(dit_modinit);
+module_exit(dit_exit);
+