ASoC: omap-hdmi-audio: Add platform device for OMAP HDMI audio support

The platform device should only be registered from OMAPDSS HDMI
driver. The platform driver registers and unregisters all ASoC
components needed for OMAP HDMI audio.

The hdmi audio driver implements cpu-dai component using the callbacks
provided by OMAPDSS and registers the component under DSS HDMI
device. Omap-pcm is registered for platform component also under DSS
HDMI device. Dummy codec is used as as codec component. The hdmi audio
driver implements also the card and registers it under its own
platform device.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

include/sound/omap-hdmi-audio.h

@@ -0,0 +1,43 @@
+/*
+ * hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Jyri Sarha <jsarha@ti.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.
+ *
+ * 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.
+ *
+ */
+
+#include <video/omapdss.h>
+
+#ifndef __OMAP_HDMI_AUDIO_H__
+#define __OMAP_HDMI_AUDIO_H__
+
+struct omap_hdmi_audio_ops {
+	int (*audio_startup)(struct device *dev,
+			     void (*abort_cb)(struct device *dev));
+	int (*audio_shutdown)(struct device *dev);
+	int (*audio_start)(struct device *dev);
+	void (*audio_stop)(struct device *dev);
+	int (*audio_config)(struct device *dev,
+			    struct omap_dss_audio *dss_audio);
+};
+
+/* HDMI audio initalization data */
+struct omap_hdmi_audio_pdata {
+	struct device *dev;
+	enum omapdss_version dss_version;
+	phys_addr_t audio_dma_addr;
+
+	const struct omap_hdmi_audio_ops *ops;
+};
+
+#endif /* __OMAP_HDMI_AUDIO_H__ */

sound/soc/omap/Kconfig

@@ -15,6 +15,21 @@ config SND_OMAP_SOC_MCPDM
 config SND_OMAP_SOC_HDMI
 	tristate
 
+config SND_OMAP_SOC_HDMI_AUDIO
+	tristate "HDMI audio support for OMAP4+ based SoCs"
+	depends on SND_OMAP_SOC
+	help
+	  For HDMI audio to work OMAPDSS HDMI support should be
+	  enabled.
+	  The hdmi audio driver implements cpu-dai component using the
+	  callbacks provided by OMAPDSS and registers the component
+	  under DSS HDMI device. Omap-pcm is registered for platform
+	  component also under DSS HDMI device. Dummy codec is used as
+	  as codec component. The hdmi audio driver implements also
+	  the card and registers it under its own platform device.
+	  The device for the dirver is registered by OMAPDSS hdmi
+	  driver.
+
 config SND_OMAP_SOC_N810
 	tristate "SoC Audio support for Nokia N810"
 	depends on SND_OMAP_SOC && MACH_NOKIA_N810 && I2C

sound/soc/omap/Makefile

@@ -4,12 +4,14 @@ snd-soc-omap-dmic-objs := omap-dmic.o
 snd-soc-omap-mcbsp-objs := omap-mcbsp.o mcbsp.o
 snd-soc-omap-mcpdm-objs := omap-mcpdm.o
 snd-soc-omap-hdmi-objs := omap-hdmi.o
+snd-soc-omap-hdmi-audio-objs := omap-hdmi-audio.o
 
 obj-$(CONFIG_SND_OMAP_SOC) += snd-soc-omap.o
 obj-$(CONFIG_SND_OMAP_SOC_DMIC) += snd-soc-omap-dmic.o
 obj-$(CONFIG_SND_OMAP_SOC_MCBSP) += snd-soc-omap-mcbsp.o
 obj-$(CONFIG_SND_OMAP_SOC_MCPDM) += snd-soc-omap-mcpdm.o
 obj-$(CONFIG_SND_OMAP_SOC_HDMI) += snd-soc-omap-hdmi.o
+obj-$(CONFIG_SND_OMAP_SOC_HDMI_AUDIO) += snd-soc-omap-hdmi-audio.o
 
 # OMAP Machine Support
 snd-soc-n810-objs := n810.o