brcm2708: add linux 4.19 support

Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 598 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.19/950-0309-Added-driver-for-the-HiFiBerry-DAC-ADC-2694.patch b/target/linux/brcm2708/patches-4.19/950-0309-Added-driver-for-the-HiFiBerry-DAC-ADC-2694.patch
new file mode 100644
index 0000000000..4ce4243b7f
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0309-Added-driver-for-the-HiFiBerry-DAC-ADC-2694.patch
@@ -0,0 +1,598 @@
+From e4b9a8f537b069bd3017f30b21bceb811263c979 Mon Sep 17 00:00:00 2001
+From: HiFiBerry <info@hifiberry.com>
+Date: Mon, 8 Oct 2018 18:10:12 +0200
+Subject: [PATCH 309/703] 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");