ASoC: rockchip: add machine driver for built-in hdmi and dp

this patch is used for rockchip built-in HDMI and DP audio output which are
wired to the same i2s line. so we use a DAI link CPU to multicodecs.

Change-Id: Ie8d1ede201a4d4b4cd11c8c05cd1f6177d844957
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>

Documentation/devicetree/bindings/sound/rockchip,hdmi-dp.txt

@@ -0,0 +1,17 @@
+ROCKCHIP Built-in HDMI and DP audio
+
+Required properties:
+- compatible: "rockchip,rk3399-hdmi-dp"
+- rockchip,cpu: The phandle of the Rockchip I2S controller that's
+  connected to the CODEC
+- rockchip,codec: The phandle of audio codecs, should contain HDMI
+  or DP, or both.
+
+Example:
+
+sound {
+	compatible = "rockchip,rk3399-hdmi-dp";
+	rockchip,cpu = <&i2s2>;
+	rockchip,codec = <&hdmi>, <&cdn_dp>;
+};
+

sound/soc/rockchip/Kconfig

@@ -32,6 +32,16 @@ config SND_SOC_ROCKCHIP_DA7219
 	  Say Y or M here if you want to add support for SoC audio on Rockchip
 	  boards using the DA7219 codec, such as Veyron.
 
+config SND_SOC_ROCKCHIP_HDMI_DP
+	tristate "ASoC support for Rockchip built-in HDMI and DP"
+	depends on SND_SOC_ROCKCHIP && CLKDEV_LOOKUP
+	depends on ROCKCHIP_CDN_DP || DRM_DW_HDMI_I2S_AUDIO
+	select SND_SOC_ROCKCHIP_I2S
+	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 and DP, such as RK3399 boards.
+
 config SND_SOC_ROCKCHIP_MAX98090
 	tristate "ASoC support for Rockchip boards using a MAX98090 codec"
 	depends on SND_SOC_ROCKCHIP && I2C && GPIOLIB && CLKDEV_LOOKUP

sound/soc/rockchip/Makefile

@@ -6,11 +6,13 @@ obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
 
 snd-soc-rockchip-da7219-objs := rockchip_da7219.o
+snd-soc-rockchip-hdmi-dp-objs := rockchip_hdmi_dp.o
 snd-soc-rockchip-max98090-objs := rockchip_max98090.o
 snd-soc-rockchip-rt5645-objs := rockchip_rt5645.o
 snd-soc-rockchip-cdndp-objs := rockchip_cdndp.o
 
 obj-$(CONFIG_SND_SOC_ROCKCHIP_DA7219) += snd-soc-rockchip-da7219.o
+obj-$(CONFIG_SND_SOC_ROCKCHIP_HDMI_DP) += snd-soc-rockchip-hdmi-dp.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_MAX98090) += snd-soc-rockchip-max98090.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_RT5645) += snd-soc-rockchip-rt5645.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_CDNDP) += snd-soc-rockchip-cdndp.o

sound/soc/rockchip/rockchip_hdmi_dp.c

@@ -0,0 +1,187 @@
+/*
+ * Rockchip machine ASoC driver for Rockchip built-in HDMI and DP audio output
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * Authors: Sugar Zhang <sugar.zhang@rock-chips.com>,
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include "rockchip_i2s.h"
+
+#define DRV_NAME "rk-hdmi-dp-sound"
+#define MAX_CODECS	2
+
+static int rk_hdmi_dp_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	int ret = 0;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	int mclk;
+
+	switch (params_rate(params)) {
+	case 8000:
+	case 16000:
+	case 24000:
+	case 32000:
+	case 48000:
+	case 64000:
+	case 96000:
+		mclk = 12288000;
+		break;
+	case 11025:
+	case 22050:
+	case 44100:
+	case 88200:
+		mclk = 11289600;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
+				     SND_SOC_CLOCK_OUT);
+
+	if (ret && ret != -ENOTSUPP) {
+		dev_err(cpu_dai->dev, "Can't set cpu clock %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct snd_soc_ops rk_ops = {
+	.hw_params = rk_hdmi_dp_hw_params,
+};
+
+static struct snd_soc_dai_link rk_dailink = {
+	.name = "HDMI-DP",
+	.stream_name = "HDMI-DP",
+	.ops = &rk_ops,
+	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+		SND_SOC_DAIFMT_CBS_CFS,
+};
+
+static struct snd_soc_card snd_soc_card_rk = {
+	.name = "rk-hdmi-dp-sound",
+	.dai_link = &rk_dailink,
+	.num_links = 1,
+	.num_aux_devs = 0,
+};
+
+static int rk_hdmi_dp_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &snd_soc_card_rk;
+	struct device_node *np = pdev->dev.of_node;
+	struct snd_soc_dai_link *link = card->dai_link;
+	struct snd_soc_dai_link_component *codecs;
+	struct of_phandle_args args;
+	struct device_node *node;
+	int count;
+	int ret = 0, i = 0, idx = 0;
+
+	card->dev = &pdev->dev;
+
+	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++) {
+		node = of_parse_phandle(np, "rockchip,codec", i);
+		if (!node)
+			return -ENODEV;
+		if (of_device_is_available(node))
+			idx++;
+	}
+
+	if (!idx)
+		return -ENODEV;
+
+	codecs = devm_kcalloc(&pdev->dev, idx,
+			      sizeof(*codecs), GFP_KERNEL);
+	link->codecs = codecs;
+	link->num_codecs = idx;
+	idx = 0;
+	for (i = 0; i < count; i++) {
+		node = of_parse_phandle(np, "rockchip,codec", i);
+		if (!node)
+			return -ENODEV;
+		if (!of_device_is_available(node))
+			continue;
+
+		ret = of_parse_phandle_with_fixed_args(np, "rockchip,codec",
+						       0, i, &args);
+		if (ret)
+			return ret;
+
+		codecs[idx].of_node = node;
+		ret = snd_soc_get_dai_name(&args, &codecs[idx].dai_name);
+		if (ret)
+			return ret;
+		idx++;
+	}
+
+	link->cpu_of_node = of_parse_phandle(np, "rockchip,cpu", 0);
+	if (!link->cpu_of_node)
+		return -ENODEV;
+
+	link->platform_of_node = link->cpu_of_node;
+
+	ret = devm_snd_soc_register_card(&pdev->dev, 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, card);
+
+	return ret;
+}
+
+static const struct of_device_id rockchip_sound_of_match[] = {
+	{ .compatible = "rockchip,rk3399-hdmi-dp", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, rockchip_sound_of_match);
+
+static struct platform_driver rockchip_sound_driver = {
+	.probe = rk_hdmi_dp_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("Sugar Zhang <sugar.zhang@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip Built-in HDMI and DP machine ASoC driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRV_NAME);