ASoC: Intel: avs: Add HDAudio machine board

Connect AVS driver with ASoC HDAudio codec with help of this machine
board. Similarly to its platform and codec components, DAI links and
routes are being created dynamically so single board can be used across
all HDAudio codec types.

Card makes use of "binder" BE DAI Link so HDAudio codec driver can be
listed as one of its components. This allows for BE DAIs to be created
dynamically, based on HDAudio codec capabilities.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220511162403.3987658-4-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/Kconfig

@@ -226,5 +226,8 @@ config SND_SOC_INTEL_AVS
 	  capabilities. This includes Skylake, Kabylake, Amberlake and
 	  Apollolake.
 
+# Machine board drivers
+source "sound/soc/intel/avs/boards/Kconfig"
+
 # ASoC codec drivers
 source "sound/soc/intel/boards/Kconfig"

sound/soc/intel/avs/Makefile

@@ -10,3 +10,6 @@ snd-soc-avs-objs += trace.o
 CFLAGS_trace.o := -I$(src)
 
 obj-$(CONFIG_SND_SOC_INTEL_AVS) += snd-soc-avs.o
+
+# Machine support
+obj-$(CONFIG_SND_SOC) += boards/

sound/soc/intel/avs/boards/Kconfig

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "Intel AVS Machine drivers"
+	depends on SND_SOC_INTEL_AVS
+
+comment "Available DSP configurations"
+
+config SND_SOC_INTEL_AVS_MACH_HDAUDIO
+	tristate "HD-Audio generic board"
+	select SND_SOC_HDA
+	help
+	  This adds support for AVS with HDAudio codec configuration.
+	  Say Y or m if you have such a device. This is a recommended option.
+	  If unsure select "N".
+
+endmenu

sound/soc/intel/avs/boards/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+snd-soc-avs-hdaudio-objs := hdaudio.o
+
+obj-$(CONFIG_SND_SOC_INTEL_AVS_MACH_HDAUDIO) += snd-soc-avs-hdaudio.o

sound/soc/intel/avs/boards/hdaudio.c

@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2021-2022 Intel Corporation. All rights reserved.
+//
+// Authors: Cezary Rojewski <cezary.rojewski@intel.com>
+//          Amadeusz Slawinski <amadeuszx.slawinski@linux.intel.com>
+//
+
+#include <linux/platform_device.h>
+#include <sound/hda_codec.h>
+#include <sound/hda_i915.h>
+#include <sound/soc.h>
+#include <sound/soc-acpi.h>
+#include "../../../codecs/hda.h"
+
+static int avs_create_dai_links(struct device *dev, struct hda_codec *codec, int pcm_count,
+				const char *platform_name, struct snd_soc_dai_link **links)
+{
+	struct snd_soc_dai_link_component *platform;
+	struct snd_soc_dai_link *dl;
+	struct hda_pcm *pcm;
+	const char *cname = dev_name(&codec->core.dev);
+	int i;
+
+	dl = devm_kcalloc(dev, pcm_count, sizeof(*dl), GFP_KERNEL);
+	platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
+	if (!dl || !platform)
+		return -ENOMEM;
+
+	platform->name = platform_name;
+	pcm = list_first_entry(&codec->pcm_list_head, struct hda_pcm, list);
+
+	for (i = 0; i < pcm_count; i++, pcm = list_next_entry(pcm, list)) {
+		dl[i].name = devm_kasprintf(dev, GFP_KERNEL, "%s link%d", cname, i);
+		if (!dl[i].name)
+			return -ENOMEM;
+
+		dl[i].id = i;
+		dl[i].nonatomic = 1;
+		dl[i].no_pcm = 1;
+		dl[i].dpcm_playback = 1;
+		dl[i].dpcm_capture = 1;
+		dl[i].platforms = platform;
+		dl[i].num_platforms = 1;
+
+		dl[i].codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);
+		dl[i].cpus = devm_kzalloc(dev, sizeof(*dl->cpus), GFP_KERNEL);
+		if (!dl[i].codecs || !dl[i].cpus)
+			return -ENOMEM;
+
+		dl[i].cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL, "%s-cpu%d", cname, i);
+		if (!dl[i].cpus->dai_name)
+			return -ENOMEM;
+
+		dl[i].codecs->name = devm_kstrdup(dev, cname, GFP_KERNEL);
+		dl[i].codecs->dai_name = pcm->name;
+		dl[i].num_codecs = 1;
+		dl[i].num_cpus = 1;
+	}
+
+	*links = dl;
+	return 0;
+}
+
+static int avs_create_dapm_routes(struct device *dev, struct hda_codec *codec, int pcm_count,
+				  struct snd_soc_dapm_route **routes, int *num_routes)
+{
+	struct snd_soc_dapm_route *dr;
+	struct hda_pcm *pcm;
+	const char *cname = dev_name(&codec->core.dev);
+	int i, n = 0;
+
+	/* at max twice the number of pcms */
+	dr = devm_kcalloc(dev, pcm_count * 2, sizeof(*dr), GFP_KERNEL);
+	if (!dr)
+		return -ENOMEM;
+
+	pcm = list_first_entry(&codec->pcm_list_head, struct hda_pcm, list);
+
+	for (i = 0; i < pcm_count; i++, pcm = list_next_entry(pcm, list)) {
+		struct hda_pcm_stream *stream;
+		int dir;
+
+		dir = SNDRV_PCM_STREAM_PLAYBACK;
+		stream = &pcm->stream[dir];
+		if (!stream->substreams)
+			goto capture_routes;
+
+		dr[n].sink = devm_kasprintf(dev, GFP_KERNEL, "%s %s", pcm->name,
+					    snd_pcm_direction_name(dir));
+		dr[n].source = devm_kasprintf(dev, GFP_KERNEL, "%s-cpu%d Tx", cname, i);
+		if (!dr[n].sink || !dr[n].source)
+			return -ENOMEM;
+		n++;
+
+capture_routes:
+		dir = SNDRV_PCM_STREAM_CAPTURE;
+		stream = &pcm->stream[dir];
+		if (!stream->substreams)
+			continue;
+
+		dr[n].sink = devm_kasprintf(dev, GFP_KERNEL, "%s-cpu%d Rx", cname, i);
+		dr[n].source = devm_kasprintf(dev, GFP_KERNEL, "%s %s", pcm->name,
+					      snd_pcm_direction_name(dir));
+		if (!dr[n].sink || !dr[n].source)
+			return -ENOMEM;
+		n++;
+	}
+
+	*routes = dr;
+	*num_routes = n;
+	return 0;
+}
+
+/* Should be aligned with SectionPCM's name from topology */
+#define FEDAI_NAME_PREFIX "HDMI"
+
+static struct snd_pcm *
+avs_card_hdmi_pcm_at(struct snd_soc_card *card, int hdmi_idx)
+{
+	struct snd_soc_pcm_runtime *rtd;
+	int dir = SNDRV_PCM_STREAM_PLAYBACK;
+
+	for_each_card_rtds(card, rtd) {
+		struct snd_pcm *spcm;
+		int ret, n;
+
+		spcm = rtd->pcm ? rtd->pcm->streams[dir].pcm : NULL;
+		if (!spcm || !strstr(spcm->id, FEDAI_NAME_PREFIX))
+			continue;
+
+		ret = sscanf(spcm->id, FEDAI_NAME_PREFIX "%d", &n);
+		if (ret != 1)
+			continue;
+		if (n == hdmi_idx)
+			return rtd->pcm;
+	}
+
+	return NULL;
+}
+
+static int avs_card_late_probe(struct snd_soc_card *card)
+{
+	struct snd_soc_acpi_mach *mach = dev_get_platdata(card->dev);
+	struct hda_codec *codec = mach->pdata;
+	struct hda_pcm *hpcm;
+	/* Topology pcm indexing is 1-based */
+	int i = 1;
+
+	list_for_each_entry(hpcm, &codec->pcm_list_head, list) {
+		struct snd_pcm *spcm;
+
+		spcm = avs_card_hdmi_pcm_at(card, i);
+		if (spcm) {
+			hpcm->pcm = spcm;
+			hpcm->device = spcm->device;
+			dev_info(card->dev, "%s: mapping HDMI converter %d to PCM %d (%p)\n",
+				 __func__, i, hpcm->device, spcm);
+		} else {
+			hpcm->pcm = NULL;
+			hpcm->device = SNDRV_PCM_INVALID_DEVICE;
+			dev_warn(card->dev, "%s: no PCM in topology for HDMI converter %d\n",
+				 __func__, i);
+		}
+		i++;
+	}
+
+	return hda_codec_probe_complete(codec);
+}
+
+static int avs_probing_link_init(struct snd_soc_pcm_runtime *rtm)
+{
+	struct snd_soc_dapm_route *routes;
+	struct snd_soc_acpi_mach *mach;
+	struct snd_soc_dai_link *links = NULL;
+	struct snd_soc_card *card = rtm->card;
+	struct hda_codec *codec;
+	struct hda_pcm *pcm;
+	int ret, n, pcm_count = 0;
+
+	mach = dev_get_platdata(card->dev);
+	codec = mach->pdata;
+
+	if (list_empty(&codec->pcm_list_head))
+		return -EINVAL;
+	list_for_each_entry(pcm, &codec->pcm_list_head, list)
+		pcm_count++;
+
+	ret = avs_create_dai_links(card->dev, codec, pcm_count, mach->mach_params.platform, &links);
+	if (ret < 0) {
+		dev_err(card->dev, "create links failed: %d\n", ret);
+		return ret;
+	}
+
+	for (n = 0; n < pcm_count; n++) {
+		ret = snd_soc_add_pcm_runtime(card, &links[n]);
+		if (ret < 0) {
+			dev_err(card->dev, "add links failed: %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = avs_create_dapm_routes(card->dev, codec, pcm_count, &routes, &n);
+	if (ret < 0) {
+		dev_err(card->dev, "create routes failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_dapm_add_routes(&card->dapm, routes, n);
+	if (ret < 0) {
+		dev_err(card->dev, "add routes failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+SND_SOC_DAILINK_DEF(dummy, DAILINK_COMP_ARRAY(COMP_DUMMY()));
+
+static struct snd_soc_dai_link probing_link = {
+	.name = "probing-LINK",
+	.id = -1,
+	.nonatomic = 1,
+	.no_pcm = 1,
+	.dpcm_playback = 1,
+	.dpcm_capture = 1,
+	.cpus = dummy,
+	.num_cpus = ARRAY_SIZE(dummy),
+	.init = avs_probing_link_init,
+};
+
+static int avs_hdaudio_probe(struct platform_device *pdev)
+{
+	struct snd_soc_dai_link *binder;
+	struct snd_soc_acpi_mach *mach;
+	struct snd_soc_card *card;
+	struct device *dev = &pdev->dev;
+	struct hda_codec *codec;
+
+	mach = dev_get_platdata(dev);
+	codec = mach->pdata;
+
+	/* codec may be unloaded before card's probe() fires */
+	if (!device_is_registered(&codec->core.dev))
+		return -ENODEV;
+
+	binder = devm_kmemdup(dev, &probing_link, sizeof(probing_link), GFP_KERNEL);
+	if (!binder)
+		return -ENOMEM;
+
+	binder->platforms = devm_kzalloc(dev, sizeof(*binder->platforms), GFP_KERNEL);
+	binder->codecs = devm_kzalloc(dev, sizeof(*binder->codecs), GFP_KERNEL);
+	if (!binder->platforms || !binder->codecs)
+		return -ENOMEM;
+
+	binder->codecs->name = devm_kstrdup(dev, dev_name(&codec->core.dev), GFP_KERNEL);
+	if (!binder->codecs->name)
+		return -ENOMEM;
+
+	binder->platforms->name = mach->mach_params.platform;
+	binder->num_platforms = 1;
+	binder->codecs->dai_name = "codec-probing-DAI";
+	binder->num_codecs = 1;
+
+	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
+	if (!card)
+		return -ENOMEM;
+
+	card->name = binder->codecs->name;
+	card->dev = dev;
+	card->owner = THIS_MODULE;
+	card->dai_link = binder;
+	card->num_links = 1;
+	card->fully_routed = true;
+	if (hda_codec_is_display(codec))
+		card->late_probe = avs_card_late_probe;
+
+	return devm_snd_soc_register_card(dev, card);
+}
+
+static struct platform_driver avs_hdaudio_driver = {
+	.probe = avs_hdaudio_probe,
+	.driver = {
+		.name = "avs_hdaudio",
+		.pm = &snd_soc_pm_ops,
+	},
+};
+
+module_platform_driver(avs_hdaudio_driver)
+
+MODULE_DESCRIPTION("Intel HD-Audio machine driver");
+MODULE_AUTHOR("Cezary Rojewski <cezary.rojewski@intel.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:avs_hdaudio");