[PATCH 17/17] ASoC: add simple-graph-scu-card support

[Kuninori Morimoto]

From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>

graph base DT binding are used on V4L2, and ALSA SoC is using different
style of DT. In case of simple case, ALSA SoC supports simple-card
driver.
In the future, V4L2 / ALSA will support HDMI, and then, DT bindings
between V4L2 / ALSA should be merged somehow.
Sometimes, we would like to use DPCM base simple-card on graph base DT.
This patch adds graph base DT binding of simple-scu-card

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
 sound/soc/generic/Kconfig                 |   8 +
 sound/soc/generic/Makefile                |   2 +
 sound/soc/generic/simple-graph-scu-card.c | 417 ++++++++++++++++++++++++++++++
 3 files changed, 427 insertions(+)
 create mode 100644 sound/soc/generic/simple-graph-scu-card.c

diff --git a/sound/soc/generic/Kconfig b/sound/soc/generic/Kconfig
index efefabd..fc11828 100644
--- a/sound/soc/generic/Kconfig
+++ b/sound/soc/generic/Kconfig
@@ -21,3 +21,11 @@ config SND_SIMPLE_GRAPH_CARD
 	select SND_SIMPLE_CARD_UTILS
 	help
 	  This option enables generic simple Graph sound card support
+
+config SND_SIMPLE_GRAPH_SCU_CARD
+	tristate "ASoC Simple Graph SCU sound card support"
+	depends on OF
+	select SND_SIMPLE_CARD_UTILS
+	help
+	  This option enables generic simple Graph SCU sound card support.
+	  It supports DPCM of multi CPU single Codec ststem.
diff --git a/sound/soc/generic/Makefile b/sound/soc/generic/Makefile
index 94eb6f1..fd75b55 100644
--- a/sound/soc/generic/Makefile
+++ b/sound/soc/generic/Makefile
@@ -2,8 +2,10 @@ snd-soc-simple-card-utils-objs	:= simple-card-utils.o
 snd-soc-simple-card-objs	:= simple-card.o
 snd-soc-simple-scu-card-objs	:= simple-scu-card.o
 snd-soc-simple-graph-card-objs	:= simple-graph-card.o
+snd-soc-simple-graph-scu-card-objs	:= simple-graph-scu-card.o
 
 obj-$(CONFIG_SND_SIMPLE_CARD_UTILS)	+= snd-soc-simple-card-utils.o
 obj-$(CONFIG_SND_SIMPLE_CARD)		+= snd-soc-simple-card.o
 obj-$(CONFIG_SND_SIMPLE_SCU_CARD)	+= snd-soc-simple-scu-card.o
 obj-$(CONFIG_SND_SIMPLE_GRAPH_CARD)	+= snd-soc-simple-graph-card.o
+obj-$(CONFIG_SND_SIMPLE_GRAPH_SCU_CARD)	+= snd-soc-simple-graph-scu-card.o
diff --git a/sound/soc/generic/simple-graph-scu-card.c b/sound/soc/generic/simple-graph-scu-card.c
new file mode 100644
index 0000000..39a5019
--- /dev/null
+++ b/sound/soc/generic/simple-graph-scu-card.c
@@ -0,0 +1,417 @@
+/*
+ * ASoC simple graph SCU sound card support
+ *
+ * Copyright (C) 2016 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
+ *
+ * based on
+ *	${LINUX}/sound/soc/generic/simple-graph-card.c
+ *	${LINUX}/sound/soc/generic/simple-scu-card.c
+ *
+ * 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.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <sound/jack.h>
+#include <sound/simple_card_utils.h>
+
+struct simple_card_data {
+	struct snd_soc_card snd_card;
+	struct snd_soc_codec_conf codec_conf;
+	struct asoc_simple_dai *dai_props;
+	struct snd_soc_dai_link *dai_link;
+	u32 convert_rate;
+	u32 convert_channels;
+};
+
+#define simple_priv_to_dev(priv) ((priv)->snd_card.dev)
+#define simple_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
+#define simple_priv_to_props(priv, i) ((priv)->dai_props + (i))
+
+#define PREFIX	"simple-audio-card,"
+
+static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
+	struct asoc_simple_dai *dai_props =
+		simple_priv_to_props(priv, rtd->num);
+
+	return clk_prepare_enable(dai_props->clk);
+}
+
+static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
+	struct asoc_simple_dai *dai_props =
+		simple_priv_to_props(priv, rtd->num);
+
+	clk_disable_unprepare(dai_props->clk);
+}
+
+static struct snd_soc_ops asoc_simple_card_ops = {
+	.startup = asoc_simple_card_startup,
+	.shutdown = asoc_simple_card_shutdown,
+};
+
+static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
+	struct snd_soc_dai *dai;
+	struct snd_soc_dai_link *dai_link;
+	struct asoc_simple_dai *dai_props;
+	int num = rtd->num;
+
+	dai_link	= simple_priv_to_link(priv, num);
+	dai_props	= simple_priv_to_props(priv, num);
+	dai		= dai_link->dynamic ?
+				rtd->cpu_dai :
+				rtd->codec_dai;
+
+	return asoc_simple_card_init_dai(dai, dai_props);
+}
+
+static int asoc_simple_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
+					       struct snd_pcm_hw_params *params)
+{
+	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+	struct snd_interval *rate = hw_param_interval(params,
+						      SNDRV_PCM_HW_PARAM_RATE);
+	struct snd_interval *channels = hw_param_interval(params,
+							  SNDRV_PCM_HW_PARAM_CHANNELS);
+
+	if (priv->convert_rate)
+		rate->min =
+		rate->max = priv->convert_rate;
+
+	if (priv->convert_channels)
+		channels->min =
+		channels->max = priv->convert_channels;
+
+	return 0;
+}
+
+static int asoc_simple_card_dai_link_of(struct device_node *port,
+					struct device_node *ep,
+					struct simple_card_data *priv,
+					unsigned int daifmt,
+					int idx, int is_fe)
+{
+	struct device *dev = simple_priv_to_dev(priv);
+	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
+	struct asoc_simple_dai *dai_props = simple_priv_to_props(priv, idx);
+	int ret;
+
+	if (is_fe) {
+		/* BE is dummy */
+		dai_link->codec_of_node		= NULL;
+		dai_link->codec_dai_name	= "snd-soc-dummy-dai";
+		dai_link->codec_name		= "snd-soc-dummy";
+
+		/* FE settings */
+		dai_link->dynamic		= 1;
+		dai_link->dpcm_merged_format	= 1;
+
+		ret = asoc_simple_card_parse_graph_cpu(ep, dai_link);
+		if (ret)
+			return ret;
+
+		ret = asoc_simple_card_parse_clk_cpu(ep, dai_link, dai_props);
+		if (ret < 0)
+			return ret;
+
+		ret = asoc_simple_card_set_dailink_name(dev, dai_link,
+							"fe.%s",
+							dai_link->cpu_dai_name);
+		if (ret < 0)
+			return ret;
+
+		/* snd_card.num_links includes Codec */
+		asoc_simple_card_canonicalize_cpu(dai_link,
+					(priv->snd_card.num_links -1) == 1);
+	} else {
+		/* FE is dummy */
+		dai_link->cpu_of_node		= NULL;
+		dai_link->cpu_dai_name		= "snd-soc-dummy-dai";
+		dai_link->cpu_name		= "snd-soc-dummy";
+
+		/* BE settings */
+		dai_link->no_pcm		= 1;
+		dai_link->be_hw_params_fixup	= asoc_simple_card_be_hw_params_fixup;
+
+		ret = asoc_simple_card_parse_graph_codec(ep, dai_link);
+		if (ret < 0)
+			return ret;
+
+		ret = asoc_simple_card_parse_clk_codec(ep, dai_link, dai_props);
+		if (ret < 0)
+			return ret;
+
+		ret = asoc_simple_card_set_dailink_name(dev, dai_link,
+							"be.%s",
+							dai_link->codec_dai_name);
+		if (ret < 0)
+			return ret;
+
+		snd_soc_of_parse_audio_prefix_from_node(&priv->snd_card,
+							port,
+							&priv->codec_conf,
+							dai_link->codec_of_node,
+							PREFIX "prefix");
+	}
+
+	ret = snd_soc_of_parse_tdm_slot(ep,
+					&dai_props->tx_slot_mask,
+					&dai_props->rx_slot_mask,
+					&dai_props->slots,
+					&dai_props->slot_width);
+	if (ret)
+		return ret;
+
+	ret = asoc_simple_card_canonicalize_dailink(dai_link);
+	if (ret < 0)
+		return ret;
+
+	dai_link->dai_fmt		= daifmt;
+	dai_link->dpcm_playback		= 1;
+	dai_link->dpcm_capture		= 1;
+	dai_link->ops			= &asoc_simple_card_ops;
+	dai_link->init			= asoc_simple_card_dai_init;
+
+	dev_dbg(dev, "\t%s / %04x / %d\n",
+		dai_link->name,
+		dai_link->dai_fmt,
+		dai_props->sysclk);
+
+	return 0;
+}
+
+static int asoc_simple_card_parse_of(struct device_node *node,
+				     struct simple_card_data *priv)
+{
+	struct device *dev = simple_priv_to_dev(priv);
+	struct device *cpu_dev = dev->parent;
+	struct device_node *ports = of_graph_get_top_port(cpu_dev);
+	struct snd_soc_card *card = &priv->snd_card;
+	struct device_node *port, *cpu_ep, *r_cpu_ep, *codec_ep;
+	unsigned int daifmt = 0;
+	int i, ret, done;
+
+	if (!node)
+		return -EINVAL;
+
+	ret = snd_soc_of_parse_audio_routing_from_node(&priv->snd_card,
+						       ports, PREFIX "routing");
+	if (ret)
+		return ret;
+
+	/* sampling rate convert */
+	of_property_read_u32(ports, PREFIX "convert-rate",
+			     &priv->convert_rate);
+
+	/* channels transfer */
+	of_property_read_u32(ports, PREFIX "convert-channels",
+			     &priv->convert_channels);
+
+	/*
+	 * it supports multi CPU, single CODEC only here.
+	 */
+
+	/* find 1st codec */
+	done = 0;
+	for_each_of_port(node, port) {
+		/* keep for_each for of_node_get/of_node_put */
+		if (done)
+			continue;
+
+		for_each_of_endpoint_in_port(port, cpu_ep) {
+			/* keep for_each for of_node_get/of_node_put */
+			if (done)
+				continue;
+
+			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
+			r_cpu_ep = of_graph_get_remote_endpoint(codec_ep);
+			of_node_put(codec_ep);
+			of_node_put(r_cpu_ep);
+			if (cpu_ep != r_cpu_ep) {
+				ret = -EINVAL;
+				goto parse_of_err;
+			}
+
+			ret = asoc_simple_card_parse_daifmt(dev,
+							    ports, codec_ep,
+							    PREFIX, &daifmt);
+			if (ret < 0)
+				goto parse_of_err;
+
+			done = 1;
+		}
+	}
+
+	/* Front-End (= CPU) */
+	i = 0;
+	for_each_of_port(node, port) {
+		for_each_of_endpoint_in_port(port, cpu_ep) {
+			ret = asoc_simple_card_dai_link_of(
+				port, cpu_ep, priv, daifmt, i, 1);
+			if (ret < 0)
+				goto parse_of_err;
+			i++;
+		}
+	}
+
+	/* Back-End (= Codec) */
+	done = 0;
+	for_each_of_port(node, port) {
+		/* keep for_each for of_node_get/of_node_put */
+		if (done)
+			continue;
+
+		for_each_of_endpoint_in_port(port, cpu_ep) {
+			/* keep for_each for of_node_get/of_node_put */
+			if (done)
+				continue;
+
+			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
+			r_cpu_ep = of_graph_get_remote_endpoint(codec_ep);
+			of_node_put(codec_ep);
+			of_node_put(r_cpu_ep);
+			if (cpu_ep != r_cpu_ep) {
+				ret = -EINVAL;
+				goto parse_of_err;
+			}
+
+			ret = asoc_simple_card_dai_link_of(
+				port, codec_ep, priv, daifmt, i, 0);
+			if (ret < 0)
+				goto parse_of_err;
+			i++;
+
+			done = 1;
+		}
+	}
+
+	ret = asoc_simple_card_parse_card_name(card, ports, PREFIX);
+	if (ret)
+		return ret;
+
+	dev_dbg(dev, "New card: %s\n",
+		priv->snd_card.name ? priv->snd_card.name : "");
+	dev_dbg(dev, "convert_rate     %d\n", priv->convert_rate);
+	dev_dbg(dev, "convert_channels %d\n", priv->convert_channels);
+
+	return 0;
+parse_of_err:
+	of_node_put(port);
+	of_node_put(cpu_ep);
+
+	return ret;
+}
+
+static int asoc_simple_card_probe(struct platform_device *pdev)
+{
+	struct simple_card_data *priv;
+	struct snd_soc_dai_link *dai_link;
+	struct asoc_simple_dai *dai_props;
+	struct device *dev = &pdev->dev;
+	struct device *cpu_dev = pdev->dev.parent;
+	struct device_node *cpu_node = cpu_dev->of_node;
+	struct asoc_simple_graph_card_info *info = pdev->dev.platform_data;
+	int num, ret;
+
+	/* Allocate the private data and the DAI link array */
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	/* it supports multi CPU, single CODEC only here */
+	num = info->endpoint_num + 1; /* +1 for Codec */
+
+	dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
+	dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
+	if (!dai_props || !dai_link)
+		return -ENOMEM;
+
+	priv->dai_props			= dai_props;
+	priv->dai_link			= dai_link;
+
+	/* Init snd_soc_card */
+	priv->snd_card.owner		= THIS_MODULE;
+	priv->snd_card.dev		= dev;
+	priv->snd_card.dai_link		= priv->dai_link;
+	priv->snd_card.num_links	= num;
+	priv->snd_card.codec_conf	= &priv->codec_conf;
+	priv->snd_card.num_configs	= 1;
+
+	ret = asoc_simple_card_parse_of(cpu_node, priv);
+	if (ret < 0) {
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "parse error %d\n", ret);
+		goto err;
+	}
+
+	/*
+	 * FIXME
+	 *
+	 * This driver is assuming that it will be called from
+	 * asoc_simple_card_try_to_probe_graph_card() which
+	 * is using platform_device_register_full().
+	 * This means it is not came from DT. But this driver itself
+	 * will be used as part of ALSA SoC (= sound card).
+	 * Because of these background, it might fail in
+	 * snd_pcm_lib_malloc_pages() on .hw_params.
+	 * Because, noone cares its dma_ops, and result of get_dma_ops()
+	 * is based on its architecture.
+	 * So, it should call arch_setup_dma_ops() from somewhere,
+	 * otherwise, for example, ARM is no problem, but ARM64 will be fail.
+	 * But, of_platform_device_xxx() are not good solution today.
+	 * This driver calls it by itself here. Please fixme
+	 * see also
+	 * linux/sound/soc/generic/simple-card-utils.c ::
+	 *	asoc_simple_card_try_to_probe_graph_card()
+	 */
+	of_dma_configure(dev, dev->of_node);
+
+	snd_soc_card_set_drvdata(&priv->snd_card, priv);
+
+	ret = devm_snd_soc_register_card(dev, &priv->snd_card);
+	if (ret >= 0)
+		return ret;
+err:
+	asoc_simple_card_clean_reference(&priv->snd_card);
+
+	return ret;
+}
+
+static int asoc_simple_card_remove(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = platform_get_drvdata(pdev);
+	struct simple_card_data *priv = snd_soc_card_get_drvdata(card);
+
+	return asoc_simple_card_clean_reference(&priv->snd_card);
+}
+
+static struct platform_driver asoc_simple_card = {
+	.driver = {
+		.name = "asoc-simple-graph-scu-card",
+	},
+	.probe = asoc_simple_card_probe,
+	.remove = asoc_simple_card_remove,
+};
+module_platform_driver(asoc_simple_card);
+
+MODULE_ALIAS("platform:asoc-simple-graph-scu-card");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ASoC Simple Graph SCU Sound Card");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>");
-- 
1.9.1