ASoC: hdac-hdmi: Add hdmi driver

This adds HDA based HDMI driver to be used in platforms like SKL
and onwards

Register the hdmi driver with hda bus and register dais.

Also parse the widget and initialize identified pin and converter
widgets.

For simplification, currently only one pin and one converter
widget are enabled on board, as well as limit the rates supported
to simples ones and not based on ELD.  This things will come
eventually once basic support for this is merged

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -67,6 +67,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_ES8328_I2C if I2C
 	select SND_SOC_GTM601
 	select SND_SOC_ICS43432
+	select SND_SOC_HDAC_HDMI
 	select SND_SOC_ISABELLE if I2C
 	select SND_SOC_JZ4740_CODEC
 	select SND_SOC_LM4857 if I2C
@@ -454,6 +455,10 @@ config SND_SOC_BT_SCO
 config SND_SOC_DMIC
 	tristate
 
+config SND_SOC_HDAC_HDMI
+	tristate
+	select SND_HDA_EXT_CORE
+
 config SND_SOC_ES8328
 	tristate "Everest Semi ES8328 CODEC"
 

sound/soc/codecs/Makefile

@@ -60,6 +60,7 @@ snd-soc-es8328-i2c-objs := es8328-i2c.o
 snd-soc-es8328-spi-objs := es8328-spi.o
 snd-soc-gtm601-objs := gtm601.o
 snd-soc-ics43432-objs := ics43432.o
+snd-soc-hdac-hdmi-objs := hdac_hdmi.o
 snd-soc-isabelle-objs := isabelle.o
 snd-soc-jz4740-codec-objs := jz4740.o
 snd-soc-l3-objs := l3.o
@@ -255,6 +256,7 @@ obj-$(CONFIG_SND_SOC_ES8328_I2C)+= snd-soc-es8328-i2c.o
 obj-$(CONFIG_SND_SOC_ES8328_SPI)+= snd-soc-es8328-spi.o
 obj-$(CONFIG_SND_SOC_GTM601)    += snd-soc-gtm601.o
 obj-$(CONFIG_SND_SOC_ICS43432)	+= snd-soc-ics43432.o
+obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
 obj-$(CONFIG_SND_SOC_ISABELLE)	+= snd-soc-isabelle.o
 obj-$(CONFIG_SND_SOC_JZ4740_CODEC)	+= snd-soc-jz4740-codec.o
 obj-$(CONFIG_SND_SOC_L3)	+= snd-soc-l3.o

sound/soc/codecs/hdac_hdmi.c

@@ -0,0 +1,344 @@
+/*
+ *  hdac_hdmi.c - ASoc HDA-HDMI codec driver for Intel platforms
+ *
+ *  Copyright (C) 2014-2015 Intel Corp
+ *  Author: Samreen Nilofer <samreen.nilofer@intel.com>
+ *	    Subhransu S. Prusty <subhransu.s.prusty@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  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/init.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/hdaudio_ext.h>
+#include "../../hda/local.h"
+
+#define PIN_OUT			(AC_PINCTL_OUT_EN)
+#define HDA_MAX_CONNECTIONS     32
+
+struct hdac_hdmi_cvt_params {
+	unsigned int channels_min;
+	unsigned int channels_max;
+	u32 rates;
+	u64 formats;
+	unsigned int maxbps;
+};
+
+struct hdac_hdmi_cvt {
+	hda_nid_t nid;
+	struct hdac_hdmi_cvt_params params;
+};
+
+struct hdac_hdmi_pin {
+	hda_nid_t nid;
+	int num_mux_nids;
+	hda_nid_t mux_nids[HDA_MAX_CONNECTIONS];
+};
+
+struct hdac_hdmi_dai_pin_map {
+	int dai_id;
+	struct hdac_hdmi_pin pin;
+	struct hdac_hdmi_cvt cvt;
+};
+
+struct hdac_hdmi_priv {
+	hda_nid_t pin_nid[3];
+	hda_nid_t cvt_nid[3];
+	struct hdac_hdmi_dai_pin_map dai_map[3];
+};
+
+static int
+hdac_hdmi_query_cvt_params(struct hdac_device *hdac, struct hdac_hdmi_cvt *cvt)
+{
+	int err;
+
+	/* Only stereo supported as of now */
+	cvt->params.channels_min = cvt->params.channels_max = 2;
+
+	err = snd_hdac_query_supported_pcm(hdac, cvt->nid,
+			&cvt->params.rates,
+			&cvt->params.formats,
+			&cvt->params.maxbps);
+	if (err < 0)
+		dev_err(&hdac->dev,
+			"Failed to query pcm params for nid %d: %d\n",
+			cvt->nid, err);
+
+	return err;
+}
+
+static int hdac_hdmi_query_pin_connlist(struct hdac_ext_device *hdac,
+					struct hdac_hdmi_pin *pin)
+{
+	if (!(get_wcaps(&hdac->hdac, pin->nid) & AC_WCAP_CONN_LIST)) {
+		dev_warn(&hdac->hdac.dev,
+			"HDMI: pin %d wcaps %#x does not support connection list\n",
+			pin->nid, get_wcaps(&hdac->hdac, pin->nid));
+		return -EINVAL;
+	}
+
+	pin->num_mux_nids = snd_hdac_get_connections(&hdac->hdac, pin->nid,
+			pin->mux_nids, HDA_MAX_CONNECTIONS);
+	if (pin->num_mux_nids == 0) {
+		dev_err(&hdac->hdac.dev, "No connections found\n");
+		return -ENODEV;
+	}
+
+	return pin->num_mux_nids;
+}
+
+static void hdac_hdmi_fill_widget_info(struct snd_soc_dapm_widget *w,
+				enum snd_soc_dapm_type id,
+				const char *wname, const char *stream)
+{
+	w->id = id;
+	w->name = wname;
+	w->sname = stream;
+	w->reg = SND_SOC_NOPM;
+	w->shift = 0;
+	w->kcontrol_news = NULL;
+	w->num_kcontrols = 0;
+	w->priv = NULL;
+}
+
+static void hdac_hdmi_fill_route(struct snd_soc_dapm_route *route,
+		const char *sink, const char *control, const char *src)
+{
+	route->sink = sink;
+	route->source = src;
+	route->control = control;
+	route->connected = NULL;
+}
+
+static void create_fill_widget_route_map(struct snd_soc_dapm_context *dapm,
+					struct hdac_hdmi_dai_pin_map *dai_map)
+{
+	struct snd_soc_dapm_route route[1];
+	struct snd_soc_dapm_widget widgets[2] = { {0} };
+
+	memset(&route, 0, sizeof(route));
+
+	hdac_hdmi_fill_widget_info(&widgets[0], snd_soc_dapm_output,
+			"hif1 Output", NULL);
+	hdac_hdmi_fill_widget_info(&widgets[1], snd_soc_dapm_aif_in,
+			"Coverter 1", "hif1");
+
+	hdac_hdmi_fill_route(&route[0], "hif1 Output", NULL, "Coverter 1");
+
+	snd_soc_dapm_new_controls(dapm, widgets, ARRAY_SIZE(widgets));
+	snd_soc_dapm_add_routes(dapm, route, ARRAY_SIZE(route));
+}
+
+static int hdac_hdmi_init_dai_map(struct hdac_ext_device *edev,
+			struct hdac_hdmi_dai_pin_map *dai_map,
+			hda_nid_t pin_nid, hda_nid_t cvt_nid, int dai_id)
+{
+	int ret;
+
+	dai_map->dai_id = dai_id;
+	dai_map->pin.nid = pin_nid;
+
+	ret = hdac_hdmi_query_pin_connlist(edev, &dai_map->pin);
+	if (ret < 0) {
+		dev_err(&edev->hdac.dev,
+			"Error querying connection list: %d\n", ret);
+		return ret;
+	}
+
+	dai_map->cvt.nid = cvt_nid;
+
+	/* Enable out path for this pin widget */
+	snd_hdac_codec_write(&edev->hdac, pin_nid, 0,
+			AC_VERB_SET_PIN_WIDGET_CONTROL, PIN_OUT);
+
+	/* Enable transmission */
+	snd_hdac_codec_write(&edev->hdac, cvt_nid, 0,
+			AC_VERB_SET_DIGI_CONVERT_1, 1);
+
+	/* Category Code (CC) to zero */
+	snd_hdac_codec_write(&edev->hdac, cvt_nid, 0,
+			AC_VERB_SET_DIGI_CONVERT_2, 0);
+
+	snd_hdac_codec_write(&edev->hdac, pin_nid, 0,
+			AC_VERB_SET_CONNECT_SEL, 0);
+
+	return hdac_hdmi_query_cvt_params(&edev->hdac, &dai_map->cvt);
+}
+
+/*
+ * Parse all nodes and store the cvt/pin nids in array
+ * Add one time initialization for pin and cvt widgets
+ */
+static int hdac_hdmi_parse_and_map_nid(struct hdac_ext_device *edev)
+{
+	hda_nid_t nid;
+	int i;
+	struct hdac_device *hdac = &edev->hdac;
+	struct hdac_hdmi_priv *hdmi = edev->private_data;
+	int cvt_nid = 0, pin_nid = 0;
+
+	hdac->num_nodes = snd_hdac_get_sub_nodes(hdac, hdac->afg, &nid);
+	if (!nid || hdac->num_nodes < 0) {
+		dev_warn(&hdac->dev, "HDMI: failed to get afg sub nodes\n");
+		return -EINVAL;
+	}
+
+	hdac->start_nid = nid;
+
+	for (i = 0; i < hdac->num_nodes; i++, nid++) {
+		unsigned int caps;
+		unsigned int type;
+
+		caps = get_wcaps(hdac, nid);
+		type = get_wcaps_type(caps);
+
+		if (!(caps & AC_WCAP_DIGITAL))
+			continue;
+
+		switch (type) {
+
+		case AC_WID_AUD_OUT:
+			hdmi->cvt_nid[cvt_nid] = nid;
+			cvt_nid++;
+			break;
+
+		case AC_WID_PIN:
+			hdmi->pin_nid[pin_nid] = nid;
+			pin_nid++;
+			break;
+		}
+	}
+
+	hdac->end_nid = nid;
+
+	if (!pin_nid || !cvt_nid)
+		return -EIO;
+
+	/*
+	 * Currently on board only 1 pin and 1 converter is enabled for
+	 * simplification, more will be added eventually
+	 * So using fixed map for dai_id:pin:cvt
+	 */
+	return hdac_hdmi_init_dai_map(edev, &hdmi->dai_map[0], hdmi->pin_nid[0],
+			hdmi->cvt_nid[0], 0);
+}
+
+static int hdmi_codec_probe(struct snd_soc_codec *codec)
+{
+	struct hdac_ext_device *edev = snd_soc_codec_get_drvdata(codec);
+	struct hdac_hdmi_priv *hdmi = edev->private_data;
+	struct snd_soc_dapm_context *dapm =
+		snd_soc_component_get_dapm(&codec->component);
+
+	edev->scodec = codec;
+
+	create_fill_widget_route_map(dapm, &hdmi->dai_map[0]);
+
+	/* Imp: Store the card pointer in hda_codec */
+	edev->card = dapm->card->snd_card;
+
+	return 0;
+}
+
+static struct snd_soc_codec_driver hdmi_hda_codec = {
+	.probe		= hdmi_codec_probe,
+	.idle_bias_off	= true,
+};
+
+static struct snd_soc_dai_driver hdmi_dais[] = {
+	{	.name = "intel-hdmi-hif1",
+		.playback = {
+			.stream_name = "hif1",
+			.channels_min = 2,
+			.channels_max = 2,
+			.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_S20_3LE |
+				SNDRV_PCM_FMTBIT_S24_LE |
+				SNDRV_PCM_FMTBIT_S32_LE,
+
+		},
+	},
+};
+
+static int hdac_hdmi_dev_probe(struct hdac_ext_device *edev)
+{
+	struct hdac_device *codec = &edev->hdac;
+	struct hdac_hdmi_priv *hdmi_priv;
+	int ret = 0;
+
+	hdmi_priv = devm_kzalloc(&codec->dev, sizeof(*hdmi_priv), GFP_KERNEL);
+	if (hdmi_priv == NULL)
+		return -ENOMEM;
+
+	edev->private_data = hdmi_priv;
+
+	dev_set_drvdata(&codec->dev, edev);
+
+	ret = hdac_hdmi_parse_and_map_nid(edev);
+	if (ret < 0)
+		return ret;
+
+	/* ASoC specific initialization */
+	return snd_soc_register_codec(&codec->dev, &hdmi_hda_codec,
+			hdmi_dais, ARRAY_SIZE(hdmi_dais));
+}
+
+static int hdac_hdmi_dev_remove(struct hdac_ext_device *edev)
+{
+	snd_soc_unregister_codec(&edev->hdac.dev);
+
+	return 0;
+}
+
+static const struct hda_device_id hdmi_list[] = {
+	HDA_CODEC_EXT_ENTRY(0x80862809, 0x100000, "Skylake HDMI", 0),
+	{}
+};
+
+MODULE_DEVICE_TABLE(hdaudio, hdmi_list);
+
+static struct hdac_ext_driver hdmi_driver = {
+	. hdac = {
+		.driver = {
+			.name   = "HDMI HDA Codec",
+		},
+		.id_table       = hdmi_list,
+	},
+	.probe          = hdac_hdmi_dev_probe,
+	.remove         = hdac_hdmi_dev_remove,
+};
+
+static int __init hdmi_init(void)
+{
+	return snd_hda_ext_driver_register(&hdmi_driver);
+}
+
+static void __exit hdmi_exit(void)
+{
+	snd_hda_ext_driver_unregister(&hdmi_driver);
+}
+
+module_init(hdmi_init);
+module_exit(hdmi_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("HDMI HD codec");
+MODULE_AUTHOR("Samreen Nilofer<samreen.nilofer@intel.com>");
+MODULE_AUTHOR("Subhransu S. Prusty<subhransu.s.prusty@intel.com>");