openwrt/target/linux/brcm2708/patches-4.19/950-0306-Added-driver-for-the-HiFiBerry-DAC-ADC-2694.patch

From dde0ec6b9fd5755de3a8962489cde9c0ce5e5005 Mon Sep 17 00:00:00 2001
From: HiFiBerry <info@hifiberry.com>
Date: Mon, 8 Oct 2018 18:10:12 +0200
Subject: [PATCH 306/806] Added driver for the HiFiBerry DAC+ ADC (#2694)

Signed-off-by: Daniel Matuschek <daniel@hifiberry.com>
---
 arch/arm/boot/dts/overlays/Makefile           |   1 +
 arch/arm/boot/dts/overlays/README             |  21 +
 .../overlays/hifiberry-dacplusadc-overlay.dts |  71 +++
 arch/arm/configs/bcm2709_defconfig            |   1 +
 arch/arm/configs/bcmrpi_defconfig             |   1 +
 sound/soc/bcm/Kconfig                         |   8 +
 sound/soc/bcm/Makefile                        |   2 +
 sound/soc/bcm/hifiberry_dacplusadc.c          | 407 ++++++++++++++++++
 8 files changed, 512 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/hifiberry-dacplusadc-overlay.dts
 create mode 100644 sound/soc/bcm/hifiberry_dacplusadc.c

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -49,6 +49,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	hifiberry-amp.dtbo \
 	hifiberry-dac.dtbo \
 	hifiberry-dacplus.dtbo \
+	hifiberry-dacplusadc.dtbo \
 	hifiberry-digi.dtbo \
 	hifiberry-digi-pro.dtbo \
 	hy28a.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -779,6 +779,27 @@ Params: 24db_digital_gain       Allow ga
                                 master for bit clock and frame clock.
 
 
+Name:   hifiberry-dacplusadc
+Info:   Configures the HifiBerry DAC+ADC audio card
+Load:   dtoverlay=hifiberry-dacplusadc,<param>=<val>
+Params: 24db_digital_gain       Allow gain to be applied via the PCM512x codec
+                                Digital volume control. Enable with
+                                "dtoverlay=hifiberry-dacplus,24db_digital_gain"
+                                (The default behaviour is that the Digital
+                                volume control is limited to a maximum of
+                                0dB. ie. it can attenuate but not provide
+                                gain. For most users, this will be desired
+                                as it will prevent clipping. By appending
+                                the 24dB_digital_gain parameter, the Digital
+                                volume control will allow up to 24dB of
+                                gain. If this parameter is enabled, it is the
+                                responsibility of the user to ensure that
+                                the Digital volume control is set to a value
+                                that does not result in clipping/distortion!)
+        slave                   Force DAC+ Pro into slave mode, using Pi as
+                                master for bit clock and frame clock.
+
+
 Name:   hifiberry-digi
 Info:   Configures the HifiBerry Digi and Digi+ audio card
 Load:   dtoverlay=hifiberry-digi
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/hifiberry-dacplusadc-overlay.dts
@@ -0,0 +1,71 @@
+// Definitions for HiFiBerry DAC+ADC
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target-path = "/clocks";
+		__overlay__ {
+			dacpro_osc: dacpro_osc {
+				compatible = "hifiberry,dacpro-clk";
+				#clock-cells = <0>;
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@2 {
+		target = <&i2c1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			pcm_codec: pcm5122@4d {
+				#sound-dai-cells = <0>;
+				compatible = "ti,pcm5122";
+				reg = <0x4d>;
+				clocks = <&dacpro_osc>;
+				AVDD-supply = <&vdd_3v3_reg>;
+				DVDD-supply = <&vdd_3v3_reg>;
+				CPVDD-supply = <&vdd_3v3_reg>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@3 {
+		target-path = "/";
+		__overlay__ {
+			dmic {
+				#sound-dai-cells = <0>;
+				compatible = "dmic-codec";
+				num-channels = <2>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@4 {
+		target = <&sound>;
+		hifiberry_dacplusadc: __overlay__ {
+			compatible = "hifiberry,hifiberry-dacplusadc";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+
+	__overrides__ {
+		24db_digital_gain =
+			<&hifiberry_dacplusadc>,"hifiberry,24db_digital_gain?";
+		slave = <&hifiberry_dacplusadc>,"hifiberry-dacplusadc,slave?";
+	};
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -905,6 +905,7 @@ CONFIG_SND_BCM2835_SOC_I2S=m
 CONFIG_SND_BCM2708_SOC_3DLAB_NANO_PLAYER=m
 CONFIG_SND_BCM2708_SOC_GOOGLEVOICEHAT_SOUNDCARD=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC=m
+CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSADC=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP=m
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -898,6 +898,7 @@ CONFIG_SND_BCM2835_SOC_I2S=m
 CONFIG_SND_BCM2708_SOC_3DLAB_NANO_PLAYER=m
 CONFIG_SND_BCM2708_SOC_GOOGLEVOICEHAT_SOUNDCARD=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC=m
+CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSADC=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI=m
 CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP=m
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -46,6 +46,14 @@ config SND_BCM2708_SOC_HIFIBERRY_DACPLUS
         help
          Say Y or M if you want to add support for HifiBerry DAC+.
 
+config SND_BCM2708_SOC_HIFIBERRY_DACPLUSADC
+        tristate "Support for HifiBerry DAC+ADC"
+        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+        select SND_SOC_PCM512x_I2C
+	select SND_SOC_DMIC
+        help
+         Say Y or M if you want to add support for HifiBerry DAC+ADC.
+
 config SND_BCM2708_SOC_HIFIBERRY_DIGI
         tristate "Support for HifiBerry Digi"
         depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -14,6 +14,7 @@ snd-soc-googlevoicehat-codec-objs := goo
 # BCM2708 Machine Support
 snd-soc-3dlab-nano-player-objs := 3dlab-nano-player.o
 snd-soc-hifiberry-dacplus-objs := hifiberry_dacplus.o
+snd-soc-hifiberry-dacplusadc-objs := hifiberry_dacplusadc.o
 snd-soc-justboom-dac-objs := justboom-dac.o
 snd-soc-rpi-cirrus-objs := rpi-cirrus.o
 snd-soc-rpi-proto-objs := rpi-proto.o
@@ -36,6 +37,7 @@ snd-soc-rpi-wm8804-soundcard-objs := rpi
 obj-$(CONFIG_SND_BCM2708_SOC_3DLAB_NANO_PLAYER) += snd-soc-3dlab-nano-player.o
 obj-$(CONFIG_SND_BCM2708_SOC_GOOGLEVOICEHAT_SOUNDCARD)  += snd-soc-googlevoicehat-codec.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUS) += snd-soc-hifiberry-dacplus.o
+obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DACPLUSADC) += snd-soc-hifiberry-dacplusadc.o
 obj-$(CONFIG_SND_BCM2708_SOC_JUSTBOOM_DAC) += snd-soc-justboom-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_CIRRUS) += snd-soc-rpi-cirrus.o
 obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO) += snd-soc-rpi-proto.o
--- /dev/null
+++ b/sound/soc/bcm/hifiberry_dacplusadc.c
@@ -0,0 +1,407 @@
+/*
+ * ASoC Driver for HiFiBerry DAC+ / DAC Pro with ADC
+ *
+ * Author:	Daniel Matuschek, Stuart MacLean <stuart@hifiberry.com>
+ *		Copyright 2014-2015
+ *		based on code by Florian Meier <florian.meier@koalo.de>
+ *		ADC added by Joerg Schambacher <joscha@schambacher.com>
+ *		Copyright 2018
+ *
+ * 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.
+ *
+ * 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/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+#include "../codecs/pcm512x.h"
+
+#define HIFIBERRY_DACPRO_NOCLOCK 0
+#define HIFIBERRY_DACPRO_CLK44EN 1
+#define HIFIBERRY_DACPRO_CLK48EN 2
+
+struct platform_device *dmic_codec_dev;
+
+struct pcm512x_priv {
+	struct regmap *regmap;
+	struct clk *sclk;
+};
+
+/* Clock rate of CLK44EN attached to GPIO6 pin */
+#define CLK_44EN_RATE 22579200UL
+/* Clock rate of CLK48EN attached to GPIO3 pin */
+#define CLK_48EN_RATE 24576000UL
+
+static bool slave;
+static bool snd_rpi_hifiberry_is_dacpro;
+static bool digital_gain_0db_limit = true;
+
+static void snd_rpi_hifiberry_dacplusadc_select_clk(struct snd_soc_component *component,
+	int clk_id)
+{
+	switch (clk_id) {
+	case HIFIBERRY_DACPRO_NOCLOCK:
+		snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x00);
+		break;
+	case HIFIBERRY_DACPRO_CLK44EN:
+		snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x20);
+		break;
+	case HIFIBERRY_DACPRO_CLK48EN:
+		snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
+		break;
+	}
+}
+
+static void snd_rpi_hifiberry_dacplusadc_clk_gpio(struct snd_soc_component *component)
+{
+	snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x24, 0x24);
+	snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02);
+	snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02);
+}
+
+static bool snd_rpi_hifiberry_dacplusadc_is_sclk(struct snd_soc_component *component)
+{
+	unsigned int sck;
+
+	snd_soc_component_read(component, PCM512x_RATE_DET_4, &sck);
+	return (!(sck & 0x40));
+}
+
+static bool snd_rpi_hifiberry_dacplusadc_is_sclk_sleep(
+	struct snd_soc_component *component)
+{
+	msleep(2);
+	return snd_rpi_hifiberry_dacplusadc_is_sclk(component);
+}
+
+static bool snd_rpi_hifiberry_dacplusadc_is_pro_card(struct snd_soc_component *component)
+{
+	bool isClk44EN, isClk48En, isNoClk;
+
+	snd_rpi_hifiberry_dacplusadc_clk_gpio(component);
+
+	snd_rpi_hifiberry_dacplusadc_select_clk(component, HIFIBERRY_DACPRO_CLK44EN);
+	isClk44EN = snd_rpi_hifiberry_dacplusadc_is_sclk_sleep(component);
+
+	snd_rpi_hifiberry_dacplusadc_select_clk(component, HIFIBERRY_DACPRO_NOCLOCK);
+	isNoClk = snd_rpi_hifiberry_dacplusadc_is_sclk_sleep(component);
+
+	snd_rpi_hifiberry_dacplusadc_select_clk(component, HIFIBERRY_DACPRO_CLK48EN);
+	isClk48En = snd_rpi_hifiberry_dacplusadc_is_sclk_sleep(component);
+
+	return (isClk44EN && isClk48En && !isNoClk);
+}
+
+static int snd_rpi_hifiberry_dacplusadc_clk_for_rate(int sample_rate)
+{
+	int type;
+
+	switch (sample_rate) {
+	case 11025:
+	case 22050:
+	case 44100:
+	case 88200:
+	case 176400:
+	case 352800:
+		type = HIFIBERRY_DACPRO_CLK44EN;
+		break;
+	default:
+		type = HIFIBERRY_DACPRO_CLK48EN;
+		break;
+	}
+	return type;
+}
+
+static void snd_rpi_hifiberry_dacplusadc_set_sclk(struct snd_soc_component *component,
+	int sample_rate)
+{
+	struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
+
+	if (!IS_ERR(pcm512x->sclk)) {
+		int ctype;
+
+		ctype = snd_rpi_hifiberry_dacplusadc_clk_for_rate(sample_rate);
+		clk_set_rate(pcm512x->sclk, (ctype == HIFIBERRY_DACPRO_CLK44EN)
+			? CLK_44EN_RATE : CLK_48EN_RATE);
+		snd_rpi_hifiberry_dacplusadc_select_clk(component, ctype);
+	}
+}
+
+static int snd_rpi_hifiberry_dacplusadc_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *component = rtd->codec_dai->component;
+	struct pcm512x_priv *priv;
+
+	if (slave)
+		snd_rpi_hifiberry_is_dacpro = false;
+	else
+		snd_rpi_hifiberry_is_dacpro =
+				snd_rpi_hifiberry_dacplusadc_is_pro_card(component);
+
+	if (snd_rpi_hifiberry_is_dacpro) {
+		struct snd_soc_dai_link *dai = rtd->dai_link;
+
+		dai->name = "HiFiBerry ADCDAC+ Pro";
+		dai->stream_name = "HiFiBerry ADCDAC+ Pro HiFi";
+		dai->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
+			| SND_SOC_DAIFMT_CBM_CFM;
+
+		snd_soc_component_update_bits(component, PCM512x_BCLK_LRCLK_CFG, 0x31, 0x11);
+		snd_soc_component_update_bits(component, PCM512x_MASTER_MODE, 0x03, 0x03);
+		snd_soc_component_update_bits(component, PCM512x_MASTER_CLKDIV_2, 0x7f, 63);
+	} else {
+		priv = snd_soc_component_get_drvdata(component);
+		priv->sclk = ERR_PTR(-ENOENT);
+	}
+
+	snd_soc_component_update_bits(component, PCM512x_GPIO_EN, 0x08, 0x08);
+	snd_soc_component_update_bits(component, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
+	snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
+
+	if (digital_gain_0db_limit) {
+		int ret;
+		struct snd_soc_card *card = rtd->card;
+
+		ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
+		if (ret < 0)
+			dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
+	}
+
+	return 0;
+}
+
+static int snd_rpi_hifiberry_dacplusadc_update_rate_den(
+	struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component = rtd->codec_dai->component;
+	struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
+	struct snd_ratnum *rats_no_pll;
+	unsigned int num = 0, den = 0;
+	int err;
+
+	rats_no_pll = devm_kzalloc(rtd->dev, sizeof(*rats_no_pll), GFP_KERNEL);
+	if (!rats_no_pll)
+		return -ENOMEM;
+
+	rats_no_pll->num = clk_get_rate(pcm512x->sclk) / 64;
+	rats_no_pll->den_min = 1;
+	rats_no_pll->den_max = 128;
+	rats_no_pll->den_step = 1;
+
+	err = snd_interval_ratnum(hw_param_interval(params,
+		SNDRV_PCM_HW_PARAM_RATE), 1, rats_no_pll, &num, &den);
+	if (err >= 0 && den) {
+		params->rate_num = num;
+		params->rate_den = den;
+	}
+
+	devm_kfree(rtd->dev, rats_no_pll);
+	return 0;
+}
+
+static int snd_rpi_hifiberry_dacplusadc_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;
+	int channels = params_channels(params);
+	int width = 32;
+
+	if (snd_rpi_hifiberry_is_dacpro) {
+		struct snd_soc_component *component = rtd->codec_dai->component;
+
+		width = snd_pcm_format_physical_width(params_format(params));
+
+		snd_rpi_hifiberry_dacplusadc_set_sclk(component,
+			params_rate(params));
+
+		ret = snd_rpi_hifiberry_dacplusadc_update_rate_den(
+			substream, params);
+	}
+
+	ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, 0x03, 0x03,
+		channels, width);
+	if (ret)
+		return ret;
+	ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x03, 0x03,
+		channels, width);
+	return ret;
+}
+
+static int hifiberry_dacplusadc_LED_cnt;
+
+static int snd_rpi_hifiberry_dacplusadc_startup(
+	struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component = rtd->codec_dai->component;
+
+	snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1,
+					 0x08, 0x08);
+	hifiberry_dacplusadc_LED_cnt++;
+	return 0;
+}
+
+static void snd_rpi_hifiberry_dacplusadc_shutdown(
+	struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component = rtd->codec_dai->component;
+
+	hifiberry_dacplusadc_LED_cnt--;
+	if (!hifiberry_dacplusadc_LED_cnt)
+		snd_soc_component_update_bits(component, PCM512x_GPIO_CONTROL_1,
+						 0x08, 0x00);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_hifiberry_dacplusadc_ops = {
+	.hw_params = snd_rpi_hifiberry_dacplusadc_hw_params,
+	.startup = snd_rpi_hifiberry_dacplusadc_startup,
+	.shutdown = snd_rpi_hifiberry_dacplusadc_shutdown,
+};
+
+static struct snd_soc_dai_link_component snd_rpi_hifiberry_dacplusadc_codecs[] = {
+	{
+		.name = "pcm512x.1-004d",
+		.dai_name = "pcm512x-hifi",
+	},
+	{
+		.name = "dmic-codec",
+		.dai_name = "dmic-hifi",
+	},
+};
+
+static struct snd_soc_dai_link snd_rpi_hifiberry_dacplusadc_dai[] = {
+{
+	.name		= "HiFiBerry DAC+ADC",
+	.stream_name	= "HiFiBerry DAC+ADC HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.platform_name	= "bcm2708-i2s.0",
+	.codecs		= snd_rpi_hifiberry_dacplusadc_codecs,
+	.num_codecs	= 2,
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+	.ops		= &snd_rpi_hifiberry_dacplusadc_ops,
+	.init		= snd_rpi_hifiberry_dacplusadc_init,
+},
+};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_hifiberry_dacplusadc = {
+	.name         = "snd_rpi_hifiberry_dacplusadc",
+	.driver_name  = "HifiberryDacpAdc",
+	.owner        = THIS_MODULE,
+	.dai_link     = snd_rpi_hifiberry_dacplusadc_dai,
+	.num_links    = ARRAY_SIZE(snd_rpi_hifiberry_dacplusadc_dai),
+};
+
+
+static int snd_rpi_hifiberry_dacplusadc_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	snd_rpi_hifiberry_dacplusadc.dev = &pdev->dev;
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai;
+
+		dai = &snd_rpi_hifiberry_dacplusadc_dai[0];
+		i2s_node = of_parse_phandle(pdev->dev.of_node,
+			"i2s-controller", 0);
+		if (i2s_node) {
+			dai->cpu_of_node = i2s_node;
+			dai->platform_of_node = i2s_node;
+			dai->cpu_dai_name = NULL;
+			dai->platform_name = NULL;
+		}
+		dai = &snd_rpi_hifiberry_dacplusadc_dai[1];
+		i2s_node = of_parse_phandle(pdev->dev.of_node, "dmic", 0);
+		if (i2s_node) {
+			dai->cpu_of_node = i2s_node;
+			dai->platform_of_node = i2s_node;
+		}
+
+	}
+	digital_gain_0db_limit = !of_property_read_bool(
+		pdev->dev.of_node, "hifiberry,24db_digital_gain");
+	slave = of_property_read_bool(pdev->dev.of_node,
+					"hifiberry-dacplusadc,slave");
+
+	ret = devm_snd_soc_register_card(&pdev->dev,
+						 &snd_rpi_hifiberry_dacplusadc);
+	if (ret && ret != -EPROBE_DEFER)
+		dev_err(&pdev->dev,
+			"snd_soc_register_card() failed: %d\n", ret);
+
+	return ret;
+}
+
+static const struct of_device_id snd_rpi_hifiberry_dacplusadc_of_match[] = {
+	{ .compatible = "hifiberry,hifiberry-dacplusadc", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, snd_rpi_hifiberry_dacplusadc_of_match);
+
+static struct platform_driver snd_rpi_hifiberry_dacplusadc_driver = {
+	.driver = {
+		.name   = "snd-rpi-hifiberry-dacplusadc",
+		.owner  = THIS_MODULE,
+		.of_match_table = snd_rpi_hifiberry_dacplusadc_of_match,
+	},
+	.probe          = snd_rpi_hifiberry_dacplusadc_probe,
+};
+
+static int __init hifiberry_dacplusadc_init(void)
+{
+	int ret;
+
+	dmic_codec_dev = platform_device_register_simple("dmic-codec", -1, NULL,
+							 0);
+	if (IS_ERR(dmic_codec_dev)) {
+		pr_err("%s: dmic-codec device registration failed\n", __func__);
+		return PTR_ERR(dmic_codec_dev);
+	}
+
+	ret = platform_driver_register(&snd_rpi_hifiberry_dacplusadc_driver);
+	if (ret) {
+		pr_err("%s: platform driver registration failed\n", __func__);
+		platform_device_unregister(dmic_codec_dev);
+	}
+
+	return ret;
+}
+module_init(hifiberry_dacplusadc_init);
+
+static void __exit hifiberry_dacplusadc_exit(void)
+{
+	platform_driver_unregister(&snd_rpi_hifiberry_dacplusadc_driver);
+	platform_device_unregister(dmic_codec_dev);
+}
+module_exit(hifiberry_dacplusadc_exit);
+
+MODULE_AUTHOR("Joerg Schambacher <joscha@schambacher.com>");
+MODULE_AUTHOR("Daniel Matuschek <daniel@hifiberry.com>");
+MODULE_DESCRIPTION("ASoC Driver for HiFiBerry DAC+ADC");
+MODULE_LICENSE("GPL v2");