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>

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index cb07d9b..bbc97fd 100644 (file)
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -18,6 +18,7 @@ config SND_SOC_ALL_CODECS
        select SND_SOC_AK4535 if I2C
        select SND_SOC_CS4270 if I2C
        select SND_SOC_PCM3008
+       select SND_SOC_SPDIF
        select SND_SOC_SSM2602 if I2C
        select SND_SOC_STAC9766 if SND_SOC_AC97_BUS
        select SND_SOC_TLV320AIC23 if I2C
@@ -91,6 +92,9 @@ config SND_SOC_L3
 config SND_SOC_PCM3008
        tristate
 
+config SND_SOC_SPDIF
+       tristate
+
 config SND_SOC_SSM2602
        tristate
 

diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 46c007c..8b75305 100644 (file)
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -6,6 +6,7 @@ snd-soc-ak4535-objs := ak4535.o
 snd-soc-cs4270-objs := cs4270.o
 snd-soc-l3-objs := l3.o
 snd-soc-pcm3008-objs := pcm3008.o
+snd-soc-spdif-objs := spdif_transciever.o
 snd-soc-ssm2602-objs := ssm2602.o
 snd-soc-stac9766-objs := stac9766.o
 snd-soc-tlv320aic23-objs := tlv320aic23.o
@@ -42,6 +43,7 @@ obj-$(CONFIG_SND_SOC_AK4535)  += snd-soc-ak4535.o
 obj-$(CONFIG_SND_SOC_CS4270)   += snd-soc-cs4270.o
 obj-$(CONFIG_SND_SOC_L3)       += snd-soc-l3.o
 obj-$(CONFIG_SND_SOC_PCM3008)  += snd-soc-pcm3008.o
+obj-$(CONFIG_SND_SOC_SPDIF)    += snd-soc-spdif.o
 obj-$(CONFIG_SND_SOC_SSM2602)  += snd-soc-ssm2602.o
 obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o
 obj-$(CONFIG_SND_SOC_TLV320AIC23)      += snd-soc-tlv320aic23.o

diff --git a/sound/soc/codecs/spdif_transciever.c b/sound/soc/codecs/spdif_transciever.c
new file mode 100644 (file)
index 0000000..118e976
--- /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);
+

diff --git a/sound/soc/codecs/spdif_transciever.h b/sound/soc/codecs/spdif_transciever.h
new file mode 100644 (file)
index 0000000..296f2eb
--- /dev/null
+++ b/sound/soc/codecs/spdif_transciever.h
@@ -0,0 +1,17 @@
+/*
+ * ALSA SoC DIT/DIR driver header
+ *
+ * Author:      Steve Chen,  <schen@mvista.com>
+ * Copyright:   (C) 2008 MontaVista Software, Inc., <source@mvista.com>
+ *
+ * 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.
+ */
+
+#ifndef CODEC_STUBS_H
+#define CODEC_STUBS_H
+
+extern struct snd_soc_dai dit_stub_dai;
+
+#endif /* CODEC_STUBS_H */