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From: Jyri Sarha <jsarha@ti.com>
To: <alsa-devel@alsa-project.org>, <linux-fbdev@vger.kernel.org>,
	<linux-omap@vger.kernel.org>
Date: Mon, 25 Aug 2014 22:04:16 +0300
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Cc: liam.r.girdwood@linux.intel.com, detheridge@ti.com, broonie@kernel.org,
	Jyri Sarha <jsarha@ti.com>, peter.ujfalusi@ti.com, tomi.valkeinen@ti.com
Subject: [alsa-devel] [PATCH v4 08/15] ASoC: omap-hdmi-audio: Add OMAP HDMI
	audio support library
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The library exports omap_hdmi_audio_register() and
omap_hdmi_audio_unregister() functions. With the functions OMAPDSS HDMI
implementation registers and unregisters all ASoC components needed
for OMAP HDMI audio.

The library implements cpu-dai component using the callbacks provided
by OMAPDSS. Omap-pcm is registered for platform component, dummy
hdmi-audio-codec is registered for codec component, and
asoc-simple-card is registered for machine driver.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
---
 include/sound/omap-hdmi-audio.h  |   50 ++++++
 sound/soc/omap/Kconfig           |    6 +
 sound/soc/omap/Makefile          |    2 +
 sound/soc/omap/omap-hdmi-audio.c |  357 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 415 insertions(+)
 create mode 100644 include/sound/omap-hdmi-audio.h
 create mode 100644 sound/soc/omap/omap-hdmi-audio.c

diff --git a/include/sound/omap-hdmi-audio.h b/include/sound/omap-hdmi-audio.h
new file mode 100644
index 0000000..0bf81f2
--- /dev/null
+++ b/include/sound/omap-hdmi-audio.h
@@ -0,0 +1,50 @@
+/*
+ * 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__
+
+/* HDMI audio initalization data */
+struct omap_hdmi_audio {
+	struct device *dev;
+	enum { OMAP4_HDMI, OMAP5_HDMI } hw_version;
+	phys_addr_t audio_dma_addr;
+
+	int (*mode_has_audio)(struct device *dev);
+	int (*audio_enable)(struct device *dev, bool enable);
+	int (*audio_start)(struct device *dev, bool enable);
+	int (*audio_config)(struct device *dev,
+			    struct omap_dss_audio *dss_audio);
+};
+
+#if IS_ENABLED(CONFIG_SND_OMAP_SOC_HDMI_AUDIO)
+int omap_hdmi_audio_register(struct omap_hdmi_audio *hdmi_audio);
+void omap_hdmi_audio_unregister(struct device *dev);
+#else
+static inline int omap_hdmi_audio_register(struct omap_hdmi_audio *hdmi_audio)
+{
+	return 0;
+}
+static inline void omap_hdmi_audio_unregister(struct device *dev)
+{
+}
+#endif
+
+#endif /* __OMAP_HDMI_AUDIO_H__ */
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig
index d44463a..a2b0801 100644
--- a/sound/soc/omap/Kconfig
+++ b/sound/soc/omap/Kconfig
@@ -15,6 +15,12 @@ config SND_OMAP_SOC_MCPDM
 config SND_OMAP_SOC_HDMI
 	tristate
 
+config SND_OMAP_SOC_HDMI_AUDIO
+	tristate
+	depends on OMAP2_DSS_HDMI_COMMON && SND_OMAP_SOC
+	select SND_SOC_HDMI_CODEC
+	select SND_SIMPLE_CARD
+
 config SND_OMAP_SOC_N810
 	tristate "SoC Audio support for Nokia N810"
 	depends on SND_OMAP_SOC && MACH_NOKIA_N810 && I2C
diff --git a/sound/soc/omap/Makefile b/sound/soc/omap/Makefile
index a725905..40688a6 100644
--- a/sound/soc/omap/Makefile
+++ b/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
diff --git a/sound/soc/omap/omap-hdmi-audio.c b/sound/soc/omap/omap-hdmi-audio.c
new file mode 100644
index 0000000..9ff7ae5
--- /dev/null
+++ b/sound/soc/omap/omap-hdmi-audio.c
@@ -0,0 +1,357 @@
+/*
+ * omap-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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/platform_device.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include <sound/dmaengine_pcm.h>
+#include <uapi/sound/asound.h>
+#include <sound/asoundef.h>
+#include <sound/omap-pcm.h>
+#include <sound/omap-hdmi-audio.h>
+#include <video/omapdss.h>
+
+#include <sound/simple_card.h>
+
+struct hdmi_audio_data {
+	int (*mode_has_audio)(struct device *dev);
+	int (*audio_enable)(struct device *dev, bool enable);
+	int (*audio_start)(struct device *dev, bool enable);
+	int (*audio_config)(struct device *dev,
+			    struct omap_dss_audio *dss_audio);
+
+	struct snd_dmaengine_dai_dma_data dma_data;
+	struct omap_dss_audio dss_audio;
+	struct snd_aes_iec958 iec;
+	struct snd_cea_861_aud_if cea;
+	struct platform_device *codec_pdev;
+	struct platform_device *card_pdev;
+};
+
+static int hdmi_dai_startup(struct snd_pcm_substream *substream,
+			    struct snd_soc_dai *dai)
+{
+	struct hdmi_audio_data *ad = omapdss_hdmi_get_audio_data(dai->dev);
+	int ret;
+	/*
+	 * Make sure that the period bytes are multiple of the DMA packet size.
+	 * Largest packet size we use is 32 32-bit words = 128 bytes
+	 */
+	ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
+					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
+	if (ret < 0) {
+		dev_err(dai->dev, "could not apply constraint\n");
+		return ret;
+	}
+
+	if (!ad->mode_has_audio(dai->dev)) {
+		dev_err(dai->dev, "audio not supported\n");
+		return -ENODEV;
+	}
+
+	snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
+
+	return 0;
+}
+
+static int hdmi_dai_prepare(struct snd_pcm_substream *substream,
+			    struct snd_soc_dai *dai)
+{
+	struct hdmi_audio_data *ad = omapdss_hdmi_get_audio_data(dai->dev);
+
+	return ad->audio_enable(dai->dev, true);
+}
+
+static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
+			      struct snd_pcm_hw_params *params,
+			      struct snd_soc_dai *dai)
+{
+	struct hdmi_audio_data *ad = omapdss_hdmi_get_audio_data(dai->dev);
+	struct snd_aes_iec958 *iec = &ad->iec;
+	struct snd_cea_861_aud_if *cea = &ad->cea;
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		ad->dma_data.maxburst = 16;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		ad->dma_data.maxburst = 32;
+		break;
+	default:
+		dev_err(dai->dev, "format not supported!\n");
+		return -EINVAL;
+	}
+
+	ad->dss_audio.iec = iec;
+	ad->dss_audio.cea = cea;
+	/*
+	 * fill the IEC-60958 channel status word
+	 */
+	/* initialize the word bytes */
+	memset(iec->status, 0, sizeof(iec->status));
+
+	/* specify IEC-60958-3 (commercial use) */
+	iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
+
+	/* specify that the audio is LPCM*/
+	iec->status[0] &= ~IEC958_AES0_NONAUDIO;
+
+	iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
+
+	iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
+
+	iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
+
+	iec->status[1] = IEC958_AES1_CON_GENERAL;
+
+	iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
+
+	iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
+
+	switch (params_rate(params)) {
+	case 32000:
+		iec->status[3] |= IEC958_AES3_CON_FS_32000;
+		break;
+	case 44100:
+		iec->status[3] |= IEC958_AES3_CON_FS_44100;
+		break;
+	case 48000:
+		iec->status[3] |= IEC958_AES3_CON_FS_48000;
+		break;
+	case 88200:
+		iec->status[3] |= IEC958_AES3_CON_FS_88200;
+		break;
+	case 96000:
+		iec->status[3] |= IEC958_AES3_CON_FS_96000;
+		break;
+	case 176400:
+		iec->status[3] |= IEC958_AES3_CON_FS_176400;
+		break;
+	case 192000:
+		iec->status[3] |= IEC958_AES3_CON_FS_192000;
+		break;
+	default:
+		dev_err(dai->dev, "rate not supported!\n");
+		return -EINVAL;
+	}
+
+	/* specify the clock accuracy */
+	iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
+
+	/*
+	 * specify the word length. The same word length value can mean
+	 * two different lengths. Hence, we need to specify the maximum
+	 * word length as well.
+	 */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
+		iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
+		iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
+		break;
+	default:
+		dev_err(dai->dev, "format not supported!\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Fill the CEA-861 audio infoframe (see spec for details)
+	 */
+
+	cea->db1_ct_cc = (params_channels(params) - 1)
+		& CEA861_AUDIO_INFOFRAME_DB1CC;
+	cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
+
+	cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
+	cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
+
+	cea->db3 = 0; /* not used, all zeros */
+
+	/*
+	 * The OMAP HDMI IP requires to use the 8-channel channel code when
+	 * transmitting more than two channels.
+	 */
+	if (params_channels(params) == 2)
+		cea->db4_ca = 0x0;
+	else
+		cea->db4_ca = 0x13;
+
+	cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
+	/* the expression is trivial but makes clear what we are doing */
+	cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
+
+	return ad->audio_config(dai->dev, &ad->dss_audio);
+}
+
+static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
+			    struct snd_soc_dai *dai)
+{
+	struct hdmi_audio_data *ad = omapdss_hdmi_get_audio_data(dai->dev);
+	int err = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		err = ad->audio_start(dai->dev, true);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		ad->audio_start(dai->dev, false);
+		break;
+	default:
+		err = -EINVAL;
+	}
+	return err;
+}
+
+static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
+			      struct snd_soc_dai *dai)
+{
+	struct hdmi_audio_data *ad = omapdss_hdmi_get_audio_data(dai->dev);
+
+	ad->audio_enable(dai->dev, false);
+}
+
+static const struct snd_soc_dai_ops hdmi_dai_ops = {
+	.startup	= hdmi_dai_startup,
+	.hw_params	= hdmi_dai_hw_params,
+	.prepare	= hdmi_dai_prepare,
+	.trigger	= hdmi_dai_trigger,
+	.shutdown	= hdmi_dai_shutdown,
+};
+
+static const struct snd_soc_component_driver omap_hdmi_component = {
+	.name = "omapdss_hdmi",
+};
+
+static struct snd_soc_dai_driver omap5_hdmi_dai = {
+	.name = "omap5-hdmi-dai",
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 8,
+		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
+			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
+			  SNDRV_PCM_RATE_192000),
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.ops = &hdmi_dai_ops,
+};
+
+static struct snd_soc_dai_driver omap4_hdmi_dai = {
+	.name = "omap4-hdmi-dai",
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 8,
+		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
+			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
+			  SNDRV_PCM_RATE_192000),
+		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
+	},
+	.ops = &hdmi_dai_ops,
+};
+
+int omap_hdmi_audio_register(struct omap_hdmi_audio *ha)
+{
+	struct hdmi_audio_data *ad;
+	struct snd_soc_dai_driver *dai_drv;
+	struct asoc_simple_card_info card_info = {
+		.codec_dai.name = "hdmi-hifi",
+	};
+	char nametmp[64];
+	int ret;
+
+	ad = devm_kzalloc(ha->dev, sizeof(*ad), GFP_KERNEL);
+	if (!ad)
+		return -ENOMEM;
+	ad->mode_has_audio = ha->mode_has_audio;
+	ad->audio_enable = ha->audio_enable;
+	ad->audio_start = ha->audio_start;
+	ad->audio_config = ha->audio_config;
+	ad->dma_data.addr = ha->audio_dma_addr;
+	ad->dma_data.filter_data = "audio_tx";
+	ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	if (ha->hw_version == OMAP5_HDMI)
+		dai_drv = &omap5_hdmi_dai;
+	else
+		dai_drv = &omap4_hdmi_dai;
+
+	ret = snd_soc_register_component(ha->dev, &omap_hdmi_component,
+					 dai_drv, 1);
+	if (ret)
+		return ret;
+
+	ret = omap_pcm_platform_register(ha->dev);
+	if (ret)
+		return ret;
+
+	ad->codec_pdev = platform_device_register_data(
+		ha->dev, "hdmi-audio-codec", 0, NULL, 0);
+
+	if (IS_ERR(ad->codec_pdev)) {
+		snd_soc_unregister_component(ha->dev);
+		return PTR_ERR(ad->codec_pdev);
+	}
+
+	snprintf(nametmp, sizeof(nametmp), "HDMI %s", dev_name(ha->dev));
+	card_info.name = devm_kstrdup(ha->dev, nametmp, GFP_KERNEL);
+	card_info.card = card_info.name;
+	card_info.cpu_dai.name = dev_name(ha->dev);
+	card_info.platform = dev_name(ha->dev);
+	card_info.codec = dev_name(&ad->codec_pdev->dev);
+
+	ad->card_pdev =
+		platform_device_register_data(ha->dev, "asoc-simple-card", 0,
+					      &card_info, sizeof(card_info));
+	if (IS_ERR(ad->card_pdev)) {
+		snd_soc_unregister_component(ha->dev);
+		platform_device_unregister(ad->codec_pdev);
+		return PTR_ERR(ad->card_pdev);
+	}
+
+	omapdss_hdmi_set_audio_data(ha->dev, ad);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap_hdmi_audio_register);
+
+void omap_hdmi_audio_unregister(struct device *dev)
+{
+	struct hdmi_audio_data *ad = omapdss_hdmi_get_audio_data(dev);
+
+	if (ad) {
+		platform_device_unregister(ad->card_pdev);
+		platform_device_unregister(ad->codec_pdev);
+		snd_soc_unregister_component(dev);
+	}
+}
+EXPORT_SYMBOL_GPL(omap_hdmi_audio_unregister);
+
+MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
+MODULE_DESCRIPTION("OMAP HDMI Audio Support Library");
+MODULE_LICENSE("GPL");