1 files changed, 407 insertions, 0 deletions

diff --git a/sound/soc/omap/omap-hdmi-audio.c b/sound/soc/omap/omap-hdmi-audio.c
new file mode 100644
index 000000000..4775da4c4
--- /dev/null
+++ b/sound/soc/omap/omap-hdmi-audio.c
@@ -0,0 +1,407 @@
+/*
+ * 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>
+
+#define DRV_NAME "omap-hdmi-audio"
+
+struct hdmi_audio_data {
+	struct snd_soc_card *card;
+
+	const struct omap_hdmi_audio_ops *ops;
+	struct device *dssdev;
+	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 mutex current_stream_lock;
+	struct snd_pcm_substream *current_stream;
+};
+
+static
+struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
+{
+	struct snd_soc_pcm_runtime *rtd = ss->private_data;
+
+	return snd_soc_card_get_drvdata(rtd->card);
+}
+
+static void hdmi_dai_abort(struct device *dev)
+{
+	struct hdmi_audio_data *ad = dev_get_drvdata(dev);
+
+	mutex_lock(&ad->current_stream_lock);
+	if (ad->current_stream && ad->current_stream->runtime &&
+	    snd_pcm_running(ad->current_stream)) {
+		dev_err(dev, "HDMI display disabled, aborting playback\n");
+		snd_pcm_stream_lock_irq(ad->current_stream);
+		snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
+		snd_pcm_stream_unlock_irq(ad->current_stream);
+	}
+	mutex_unlock(&ad->current_stream_lock);
+}
+
+static int hdmi_dai_startup(struct snd_pcm_substream *substream,
+			    struct snd_soc_dai *dai)
+{
+	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
+	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;
+	}
+
+	snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
+
+	mutex_lock(&ad->current_stream_lock);
+	ad->current_stream = substream;
+	mutex_unlock(&ad->current_stream_lock);
+
+	ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
+
+	if (ret) {
+		mutex_lock(&ad->current_stream_lock);
+		ad->current_stream = NULL;
+		mutex_unlock(&ad->current_stream_lock);
+	}
+
+	return ret;
+}
+
+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 = card_drvdata_substream(substream);
+	struct snd_aes_iec958 *iec = &ad->iec;
+	struct snd_cea_861_aud_if *cea = &ad->cea;
+
+	WARN_ON(ad->current_stream != substream);
+
+	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[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->ops->audio_config(ad->dssdev, &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 = card_drvdata_substream(substream);
+	int err = 0;
+
+	WARN_ON(ad->current_stream != substream);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		err = ad->ops->audio_start(ad->dssdev);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		ad->ops->audio_stop(ad->dssdev);
+		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 = card_drvdata_substream(substream);
+
+	WARN_ON(ad->current_stream != substream);
+
+	ad->ops->audio_shutdown(ad->dssdev);
+
+	mutex_lock(&ad->current_stream_lock);
+	ad->current_stream = NULL;
+	mutex_unlock(&ad->current_stream_lock);
+}
+
+static const struct snd_soc_dai_ops hdmi_dai_ops = {
+	.startup	= hdmi_dai_startup,
+	.hw_params	= hdmi_dai_hw_params,
+	.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,
+};
+
+static int omap_hdmi_audio_probe(struct platform_device *pdev)
+{
+	struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
+	struct device *dev = &pdev->dev;
+	struct hdmi_audio_data *ad;
+	struct snd_soc_dai_driver *dai_drv;
+	struct snd_soc_card *card;
+	int ret;
+
+	if (!ha) {
+		dev_err(dev, "No platform data\n");
+		return -EINVAL;
+	}
+
+	ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
+	if (!ad)
+		return -ENOMEM;
+	ad->dssdev = ha->dev;
+	ad->ops = ha->ops;
+	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;
+	mutex_init(&ad->current_stream_lock);
+
+	switch (ha->dss_version) {
+	case OMAPDSS_VER_OMAP4430_ES1:
+	case OMAPDSS_VER_OMAP4430_ES2:
+	case OMAPDSS_VER_OMAP4:
+		dai_drv = &omap4_hdmi_dai;
+		break;
+	case OMAPDSS_VER_OMAP5:
+		dai_drv = &omap5_hdmi_dai;
+		break;
+	default:
+		return -EINVAL;
+	}
+	ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
+					 dai_drv, 1);
+	if (ret)
+		return ret;
+
+	ret = omap_pcm_platform_register(ad->dssdev);
+	if (ret)
+		return ret;
+
+	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	card->name = devm_kasprintf(dev, GFP_KERNEL,
+				    "HDMI %s", dev_name(ad->dssdev));
+	card->owner = THIS_MODULE;
+	card->dai_link =
+		devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
+	card->dai_link->name = card->name;
+	card->dai_link->stream_name = card->name;
+	card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
+	card->dai_link->platform_name = dev_name(ad->dssdev);
+	card->dai_link->codec_name = "snd-soc-dummy";
+	card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
+	card->num_links = 1;
+	card->dev = dev;
+
+	ret = snd_soc_register_card(card);
+	if (ret) {
+		dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
+		snd_soc_unregister_component(ad->dssdev);
+		return ret;
+	}
+
+	ad->card = card;
+	snd_soc_card_set_drvdata(card, ad);
+
+	dev_set_drvdata(dev, ad);
+
+	return 0;
+}
+
+static int omap_hdmi_audio_remove(struct platform_device *pdev)
+{
+	struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
+
+	snd_soc_unregister_card(ad->card);
+	snd_soc_unregister_component(ad->dssdev);
+	return 0;
+}
+
+static struct platform_driver hdmi_audio_driver = {
+	.driver = {
+		.name = DRV_NAME,
+	},
+	.probe = omap_hdmi_audio_probe,
+	.remove = omap_hdmi_audio_remove,
+};
+
+module_platform_driver(hdmi_audio_driver);
+
+MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
+MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);