ASoC: codec: add dummy codec for rockchip

Change-Id: I86cb74994d49178525e15b61b5056fd3995e904d
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>

Documentation/devicetree/bindings/sound/rockchip,dummy-codec.txt

@@ -0,0 +1,11 @@
+* Rockchip Dummy Codec
+
+Required properties:
+
+- compatible: "rockchip,dummy-codec"
+
+Example for rk3308 dummy codec:
+
+dummy_codec: dummy-codec {
+	compatible = "rockchip,dummy-codec";
+};

sound/soc/codecs/Kconfig

@@ -471,6 +471,9 @@ config SND_SOC_DA732X
 config SND_SOC_DA9055
 	tristate
 
+config SND_SOC_DUMMY_CODEC
+	tristate "dummy codec"
+
 config SND_SOC_DW_HDMI_AUDIO
 	tristate "dw hdmi audio"
 	depends on RK_HDMI

sound/soc/codecs/Makefile

@@ -55,6 +55,7 @@ snd-soc-da7213-objs := da7213.o
 snd-soc-da7219-objs := da7219.o da7219-aad.o
 snd-soc-da732x-objs := da732x.o
 snd-soc-da9055-objs := da9055.o
+snd-soc-dummy-codec-objs := dummy-codec.o
 snd-soc-dw-hdmi-audio-objs := dw-hdmi-audio.o
 snd-soc-bt-sco-objs := bt-sco.o
 snd-soc-dmic-objs := dmic.o
@@ -267,6 +268,7 @@ obj-$(CONFIG_SND_SOC_DA7213)	+= snd-soc-da7213.o
 obj-$(CONFIG_SND_SOC_DA7219)	+= snd-soc-da7219.o
 obj-$(CONFIG_SND_SOC_DA732X)	+= snd-soc-da732x.o
 obj-$(CONFIG_SND_SOC_DA9055)	+= snd-soc-da9055.o
+obj-$(CONFIG_SND_SOC_DUMMY_CODEC)	+= snd-soc-dummy-codec.o
 obj-$(CONFIG_SND_SOC_DW_HDMI_AUDIO)	+= snd-soc-dw-hdmi-audio.o
 obj-$(CONFIG_SND_SOC_BT_SCO)	+= snd-soc-bt-sco.o
 obj-$(CONFIG_SND_SOC_DMIC)	+= snd-soc-dmic.o

sound/soc/codecs/dummy-codec.c

@@ -0,0 +1,84 @@
+/*
+ * dummy_codec.c  --  dummy audio codec for rockchip
+ *
+ * Copyright (C) 2018 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/module.h>
+#include <linux/moduleparam.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <sound/soc.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+
+struct snd_soc_dai_driver dummy_dai = {
+	.name = "dummy_codec",
+	.playback = {
+		.stream_name = "Dummy Playback",
+		.channels_min = 2,
+		.channels_max = 8,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = (SNDRV_PCM_FMTBIT_S16_LE |
+			    SNDRV_PCM_FMTBIT_S20_3LE |
+			    SNDRV_PCM_FMTBIT_S24_LE |
+			    SNDRV_PCM_FMTBIT_S32_LE),
+	},
+	.capture = {
+		.stream_name = "Dummy Capture",
+		.channels_min = 2,
+		.channels_max = 8,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = (SNDRV_PCM_FMTBIT_S16_LE |
+			    SNDRV_PCM_FMTBIT_S20_3LE |
+			    SNDRV_PCM_FMTBIT_S24_LE |
+			    SNDRV_PCM_FMTBIT_S32_LE),
+	},
+};
+
+static struct snd_soc_codec_driver soc_dummy_codec;
+
+static int rockchip_dummy_codec_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_codec(&pdev->dev, &soc_dummy_codec,
+				      &dummy_dai, 1);
+}
+
+static int rockchip_dummy_codec_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_codec(&pdev->dev);
+
+	return 0;
+}
+
+static const struct of_device_id rockchip_dummy_codec_of_match[] = {
+	{ .compatible = "rockchip,dummy-codec", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rockchip_dummy_codec_of_match);
+
+static struct platform_driver rockchip_dummy_codec_driver = {
+	.driver = {
+		.name = "dummy_codec",
+		.of_match_table = of_match_ptr(rockchip_dummy_codec_of_match),
+	},
+	.probe = rockchip_dummy_codec_probe,
+	.remove = rockchip_dummy_codec_remove,
+};
+
+module_platform_driver(rockchip_dummy_codec_driver);
+
+MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip Dummy Codec Driver");
+MODULE_LICENSE("GPL v2");