ASoC: rockchip: add machine driver for hdmi audio

this patch is used for rockchip HDMI audio output.

Signed-off-by: XiaoTan Luo <lxt@rock-chips.com>
Change-Id: I577179e7563ad241014d023da12af1e622e84c9a

sound/soc/rockchip/Kconfig

@@ -108,6 +108,14 @@ config SND_SOC_ROCKCHIP_RT5651_RK628
 	  Say Y or M here if you want to add support for SoC audio on Rockchip
 	  boards for RT5651 RK628 HDMIIn
 
+config SND_SOC_ROCKCHIP_HDMI
+	tristate "ASoC support for Rockchip HDMI audio"
+	depends on SND_SOC_ROCKCHIP && CLKDEV_LOOKUP
+	select SND_SOC_HDMI_CODEC
+	help
+	  Say Y or M here if you want to add support for SoC audio on Rockchip
+	  boards using built-in HDMI or external HDMI.
+
 config SND_SOC_RK3288_HDMI_ANALOG
 	tristate "ASoC support multiple codecs for Rockchip RK3288 boards"
 	depends on SND_SOC_ROCKCHIP && I2C && GPIOLIB && CLKDEV_LOOKUP

sound/soc/rockchip/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_SND_SOC_ROCKCHIP_PDM) += snd-soc-rockchip-pdm.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_VAD) += snd-soc-rockchip-vad.o
 
+snd-soc-rockchip-hdmi-objs := rockchip_hdmi.o
 snd-soc-rockchip-max98090-objs := rockchip_max98090.o
 snd-soc-rockchip-multicodecs-objs := rockchip_multicodecs.o
 snd-soc-rockchip-rt5645-objs := rockchip_rt5645.o
@@ -30,6 +31,7 @@ snd-soc-rockchip-rt5651-rk628-objs := rockchip_rt5651_rk628.o
 snd-soc-rk3288-hdmi-analog-objs := rk3288_hdmi_analog.o
 snd-soc-rk3399-gru-sound-objs := rk3399_gru_sound.o
 
+obj-$(CONFIG_SND_SOC_ROCKCHIP_HDMI) += snd-soc-rockchip-hdmi.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_MAX98090) += snd-soc-rockchip-max98090.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_MULTICODECS) += snd-soc-rockchip-multicodecs.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_RT5645) += snd-soc-rockchip-rt5645.o

sound/soc/rockchip/rockchip_hdmi.c

@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Rockchip machine ASoC driver for Rockchip HDMI audio output
+ *
+ * Copyright (C) 2021 Rockchip Electronics Co., Ltd
+ *
+ * Authors: XiaoTan Luo <lxt@rock-chips.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/jack.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#define DRV_NAME "rk-hdmi-sound"
+#define MAX_CODECS	2
+#define DEFAULT_MCLK_FS	256
+
+struct rk_hdmi_data {
+	struct snd_soc_card	card;
+	struct snd_soc_dai_link	dai;
+	struct snd_soc_jack	hdmi_jack;
+	struct snd_soc_jack_pin	hdmi_jack_pin;
+	unsigned int		mclk_fs;
+	bool			jack_det;
+};
+
+static int rk_hdmi_fill_widget_info(struct device *dev,
+		struct snd_soc_dapm_widget *w, enum snd_soc_dapm_type id,
+		void *priv, const char *wname, const char *stream,
+		struct snd_kcontrol_new *wc, int numkc,
+		int (*event)(struct snd_soc_dapm_widget *,
+		struct snd_kcontrol *, int), unsigned short event_flags)
+{
+	w->id = id;
+	w->name = devm_kstrdup(dev, wname, GFP_KERNEL);
+	if (!w->name)
+		return -ENOMEM;
+
+	w->sname = stream;
+	w->reg = SND_SOC_NOPM;
+	w->shift = 0;
+	w->kcontrol_news = wc;
+	w->num_kcontrols = numkc;
+	w->priv = priv;
+	w->event = event;
+	w->event_flags = event_flags;
+
+	return 0;
+}
+
+static int rk_dailink_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_card *card = rtd->card;
+	struct rk_hdmi_data *rk_data = snd_soc_card_get_drvdata(rtd->card);
+	struct device *dev = rtd->card->dev;
+	int ret = 0;
+	struct snd_soc_dapm_widget *widgets;
+
+	if (!rk_data->jack_det)
+		return 0;
+
+	widgets = devm_kcalloc(card->dapm.dev, 1,
+			       sizeof(*widgets), GFP_KERNEL);
+	if (!widgets)
+		return -ENOMEM;
+
+	ret = rk_hdmi_fill_widget_info(card->dapm.dev, widgets,
+				       snd_soc_dapm_line, NULL,
+				       rk_data->hdmi_jack_pin.pin,
+				       NULL, NULL, 0, NULL, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_soc_dapm_new_controls(&card->dapm, widgets, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_soc_dapm_new_widgets(rtd->card);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_soc_card_jack_new(rtd->card,
+				    rk_data->hdmi_jack_pin.pin,
+				    rk_data->hdmi_jack_pin.mask,
+				    &rk_data->hdmi_jack,
+				    &rk_data->hdmi_jack_pin, 1);
+	if (ret) {
+		dev_err(dev, "Can't new HDMI Jack %d\n", ret);
+		return ret;
+	}
+	return snd_soc_component_set_jack(codec_dai->component,
+					  &rk_data->hdmi_jack, NULL);
+
+}
+
+static int rk_hdmi_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	struct rk_hdmi_data *rk_data = snd_soc_card_get_drvdata(rtd->card);
+	unsigned int mclk;
+	int ret;
+
+	mclk = params_rate(params) * rk_data->mclk_fs;
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, substream->stream, mclk,
+				     SND_SOC_CLOCK_IN);
+	if (ret && ret != -ENOTSUPP) {
+		dev_err(codec_dai->dev,
+			"Set codec_dai sysclk failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_sysclk(cpu_dai, substream->stream, mclk,
+				     SND_SOC_CLOCK_OUT);
+	if (ret && ret != -ENOTSUPP) {
+		dev_err(cpu_dai->dev,
+			"Set cpu_dai sysclk failed: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+
+}
+
+static struct snd_soc_ops rk_ops = {
+	.hw_params = rk_hdmi_hw_params,
+};
+
+static int rk_hdmi_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct snd_soc_dai_link_component *codecs;
+	struct of_phandle_args args;
+	struct device_node *codec_np, *cpu_np;
+	struct rk_hdmi_data *rk_data;
+	int count;
+	u32 val;
+	int ret = 0, i = 0, idx = 0;
+
+	rk_data = devm_kzalloc(&pdev->dev, sizeof(*rk_data), GFP_KERNEL);
+	if (!rk_data)
+		return -ENOMEM;
+
+	rk_data->card.dev = &pdev->dev;
+	rk_data->dai.init = &rk_dailink_init;
+	rk_data->dai.ops = &rk_ops;
+	rk_data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+			       SND_SOC_DAIFMT_CBS_CFS;
+	/* Parse the card name from DT */
+	ret = snd_soc_of_parse_card_name(&rk_data->card, "rockchip,card-name");
+	if (ret < 0)
+		return ret;
+	rk_data->dai.name = rk_data->card.name;
+	rk_data->dai.stream_name = rk_data->card.name;
+	count = of_count_phandle_with_args(np, "rockchip,codec", NULL);
+	if (count < 0 || count > MAX_CODECS)
+		return -EINVAL;
+
+	/* refine codecs, remove unavailable node */
+	for (i = 0; i < count; i++) {
+		codec_np = of_parse_phandle(np, "rockchip,codec", i);
+		if (!codec_np)
+			return -ENODEV;
+		if (of_device_is_available(codec_np))
+			idx++;
+		of_node_put(codec_np);
+	}
+
+	if (!idx)
+		return -ENODEV;
+
+	codecs = devm_kcalloc(&pdev->dev, idx,
+			      sizeof(*codecs), GFP_KERNEL);
+	rk_data->dai.codecs = codecs;
+	rk_data->dai.num_codecs = idx;
+	idx = 0;
+	for (i = 0; i < count; i++) {
+		codec_np = of_parse_phandle(np, "rockchip,codec", i);
+		if (!codec_np)
+			return -ENODEV;
+		if (!of_device_is_available(codec_np))
+			continue;
+
+		ret = of_parse_phandle_with_fixed_args(np, "rockchip,codec",
+						       0, i, &args);
+		if (ret) {
+			of_node_put(codec_np);
+			return ret;
+		}
+
+		codecs[idx].of_node = codec_np;
+		of_node_put(codec_np);
+		ret = snd_soc_get_dai_name(&args, &codecs[idx].dai_name);
+		if (ret)
+			return ret;
+		idx++;
+	}
+
+	cpu_np = of_parse_phandle(np, "rockchip,cpu", 0);
+	if (!cpu_np)
+		return -ENODEV;
+
+	rk_data->mclk_fs = DEFAULT_MCLK_FS;
+	if (!of_property_read_u32(np, "rockchip,mclk-fs", &val))
+		rk_data->mclk_fs = val;
+
+	rk_data->jack_det =
+		of_property_read_bool(np, "rockchip,jack-det");
+
+	rk_data->dai.cpu_of_node = cpu_np;
+	rk_data->dai.platform_of_node = cpu_np;
+	of_node_put(cpu_np);
+
+	rk_data->hdmi_jack_pin.pin = rk_data->card.name;
+	rk_data->hdmi_jack_pin.mask = SND_JACK_LINEOUT;
+	rk_data->card.num_links = 1;
+	rk_data->card.owner = THIS_MODULE;
+	rk_data->card.dai_link = &rk_data->dai;
+
+	snd_soc_card_set_drvdata(&rk_data->card, rk_data);
+	ret = devm_snd_soc_register_card(&pdev->dev, &rk_data->card);
+	if (ret == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
+	if (ret) {
+		dev_err(&pdev->dev, "card register failed %d\n", ret);
+		return ret;
+	}
+	platform_set_drvdata(pdev, &rk_data->card);
+
+	return ret;
+}
+
+static const struct of_device_id rockchip_sound_of_match[] = {
+	{ .compatible = "rockchip,hdmi", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, rockchip_sound_of_match);
+
+static struct platform_driver rockchip_sound_driver = {
+	.probe = rk_hdmi_probe,
+	.driver = {
+		.name = DRV_NAME,
+		.pm = &snd_soc_pm_ops,
+		.of_match_table = rockchip_sound_of_match,
+	},
+};
+
+module_platform_driver(rockchip_sound_driver);
+
+MODULE_AUTHOR("XiaoTan Luo <lxt@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip HDMI ASoC machine driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);