From 46c94fc6017e8a4e768aeb7c4b3d3a40928f1fa6 Mon Sep 17 00:00:00 2001
From: escalator2015 <jmtasende@gmail.com>
Date: Tue, 24 May 2016 16:20:09 +0100
Subject: [PATCH] New driver for RRA DigiDAC1 soundcard using WM8741 + WM8804

---
 arch/arm/boot/dts/overlays/Makefile                |   1 +
 arch/arm/boot/dts/overlays/README                  |   6 +
 .../overlays/rra-digidac1-wm8741-audio-overlay.dts |  81 ++++
 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/digidac1-soundcard.c                 | 422 +++++++++++++++++++++
 8 files changed, 522 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/rra-digidac1-wm8741-audio-overlay.dts
 create mode 100644 sound/soc/bcm/digidac1-soundcard.c

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -67,6 +67,7 @@ dtbo-$(RPI_DT_OVERLAYS) += rpi-display.d
 dtbo-$(RPI_DT_OVERLAYS) += rpi-ft5406.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += rpi-proto.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += rpi-sense.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += rra-digidac1-wm8741-audio.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += sdhost.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += sdio.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += sdio-1bit.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -842,6 +842,12 @@ Load:   dtoverlay=rpi-sense
 Params: <None>
 
 
+Name:   rra-digidac1-wm8741-audio
+Info:   Configures the Red Rocks Audio DigiDAC1 soundcard
+Load:   dtoverlay=rra-digidac1-wm8741-audio
+Params: <None>
+
+
 Name:   sdhost
 Info:   Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
         N.B. This overlay is designed for situations where the mmc driver is
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/rra-digidac1-wm8741-audio-overlay.dts
@@ -0,0 +1,81 @@
+// Definitions for RRA DigiDAC1 Audio card
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target-path = "/";
+		__overlay__ {
+			aliases {
+				ldo0 = &ldo0;
+				ldo1 = &ldo1;
+			};
+		};
+	};
+
+	fragment@1 {
+		target-path = "/soc";
+		__overlay__ {
+
+			ldo1: ldo1 {
+				compatible = "regulator-fixed";
+				regulator-name = "DC_5V";
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5000000>;
+				regulator-always-on;
+			};
+
+			ldo0: ldo0 {
+				compatible = "regulator-fixed";
+				regulator-name = "DC_3V3";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
+				regulator-always-on;
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&i2s>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@3 {
+		target = <&i2c1>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			wm8804@3b {
+				#sound-dai-cells = <0>;
+				compatible = "wlf,wm8804";
+				reg = <0x3b>;
+				status = "okay";
+				PVDD-supply = <&ldo0>;
+				DVDD-supply = <&ldo0>;
+			};
+
+			wm8742: wm8741@1a {
+				compatible = "wlf,wm8741";
+				reg = <0x1a>;
+				status = "okay";
+				AVDD-supply = <&ldo1>;
+				DVDD-supply = <&ldo0>;
+			};
+		};
+	};
+
+	fragment@4 {
+		target = <&sound>;
+		__overlay__ {
+			compatible = "rra,digidac1-soundcard";
+			i2s-controller = <&i2s>;
+			status = "okay";
+		};
+	};
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -866,6 +866,7 @@ CONFIG_SND_BCM2708_SOC_JUSTBOOM_DIGI=m
 CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
 CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
 CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD=m
+CONFIG_SND_DIGIDAC1_SOUNDCARD=m
 CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
 CONFIG_SND_SOC_ADAU1701=m
 CONFIG_SND_SOC_WM8804_I2C=m
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -858,6 +858,7 @@ CONFIG_SND_BCM2708_SOC_JUSTBOOM_DIGI=m
 CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC=m
 CONFIG_SND_BCM2708_SOC_RASPIDAC3=m
 CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD=m
+CONFIG_SND_DIGIDAC1_SOUNDCARD=m
 CONFIG_SND_BCM2708_SOC_ADAU1977_ADC=m
 CONFIG_SND_SOC_ADAU1701=m
 CONFIG_SND_SOC_WM8804_I2C=m
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -92,3 +92,11 @@ config SND_AUDIOINJECTOR_PI_SOUNDCARD
 	select SND_SOC_WM8731
 	help
 	  Say Y or M if you want to add support for audioinjector.net Pi Hat
+
+config SND_DIGIDAC1_SOUNDCARD
+        tristate "Support for Red Rocks Audio DigiDAC1"
+        depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+        select SND_SOC_WM8804
+        select SND_SOC_WM8741
+        help
+         Say Y or M if you want to add support for Red Rocks Audio DigiDAC1 board.
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -16,6 +16,7 @@ snd-soc-rpi-proto-objs := rpi-proto.o
 snd-soc-iqaudio-dac-objs := iqaudio-dac.o
 snd-soc-raspidac3-objs := raspidac3.o
 snd-soc-audioinjector-pi-soundcard-objs := audioinjector-pi-soundcard.o
+snd-soc-digidac1-soundcard-objs := digidac1-soundcard.o
 
 obj-$(CONFIG_SND_BCM2708_SOC_ADAU1977_ADC) += snd-soc-adau1977-adc.o
 obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
@@ -29,4 +30,5 @@ obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO)
 obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
 obj-$(CONFIG_SND_BCM2708_SOC_RASPIDAC3) += snd-soc-raspidac3.o
 obj-$(CONFIG_SND_AUDIOINJECTOR_PI_SOUNDCARD) += snd-soc-audioinjector-pi-soundcard.o
+obj-$(CONFIG_SND_DIGIDAC1_SOUNDCARD) += snd-soc-digidac1-soundcard.o
 
--- /dev/null
+++ b/sound/soc/bcm/digidac1-soundcard.c
@@ -0,0 +1,422 @@
+/*
+ * ASoC Driver for RRA DigiDAC1
+ * Copyright 2016
+ * Author: José M. Tasende <vintage@redrocksaudio.es>
+ * based on the HifiBerry DAC driver by Florian Meier <florian.meier@koalo.de>
+ * and the Wolfson card driver by Nikesh Oswal, <Nikesh.Oswal@wolfsonmicro.com>
+ * 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/i2c.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+#include <sound/soc-dapm.h>
+#include <sound/tlv.h>
+#include <linux/regulator/consumer.h>
+
+#include "../codecs/wm8804.h"
+#include "../codecs/wm8741.h"
+
+#define WM8741_NUM_SUPPLIES 2
+
+/* codec private data */
+struct wm8741_priv {
+	struct wm8741_platform_data pdata;
+	struct regmap *regmap;
+	struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
+	unsigned int sysclk;
+	const struct snd_pcm_hw_constraint_list *sysclk_constraints;
+};
+
+static int samplerate = 44100;
+
+/* New Alsa Controls not exposed by original wm8741 codec driver	*/
+/* in actual driver the att. adjustment is wrong because		*/
+/* this DAC has a coarse attenuation register with 4dB steps		*/
+/* and a fine level register with 0.125dB steps				*/
+/* each register has 32 steps so combining both we have	1024 steps	*/
+/* of 0.125 dB.								*/
+/* The original level controls from driver are removed at startup	*/
+/* and replaced by the corrected ones.					*/
+/* The same wm8741 driver can be used for wm8741 and wm8742 devices	*/
+
+static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, 0, 13, 0);
+static const DECLARE_TLV_DB_SCALE(dac_tlv_coarse, -12700, 400, 1);
+static const char *w8741_dither[4] = {"Off", "RPDF", "TPDF", "HPDF"};
+static const char *w8741_filter[5] = {
+		"Type 1", "Type 2", "Type 3", "Type 4", "Type 5"};
+static const char *w8741_switch[2] = {"Off", "On"};
+static const struct soc_enum w8741_enum[] = {
+SOC_ENUM_SINGLE(WM8741_MODE_CONTROL_2, 0, 4, w8741_dither),/* dithering type */
+SOC_ENUM_SINGLE(WM8741_FILTER_CONTROL, 0, 5, w8741_filter),/* filter type */
+SOC_ENUM_SINGLE(WM8741_FORMAT_CONTROL, 6, 2, w8741_switch),/* phase invert */
+SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 0, 2, w8741_switch),/* volume ramp */
+SOC_ENUM_SINGLE(WM8741_VOLUME_CONTROL, 3, 2, w8741_switch),/* soft mute */
+};
+
+static const struct snd_kcontrol_new w8741_snd_controls_stereo[] = {
+SOC_DOUBLE_R_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
+		WM8741_DACRLSB_ATTENUATION, 0, 31, 1, dac_tlv_fine),
+SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
+		WM8741_DACRMSB_ATTENUATION, 0, 31, 1, dac_tlv_coarse),
+SOC_ENUM("DAC Dither", w8741_enum[0]),
+SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
+SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
+SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
+SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
+};
+
+static const struct snd_kcontrol_new w8741_snd_controls_mono_left[] = {
+SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
+		0, 31, 0, dac_tlv_fine),
+SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACLMSB_ATTENUATION,
+		0, 31, 1, dac_tlv_coarse),
+SOC_ENUM("DAC Dither", w8741_enum[0]),
+SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
+SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
+SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
+SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
+};
+
+static const struct snd_kcontrol_new w8741_snd_controls_mono_right[] = {
+SOC_SINGLE_TLV("DAC Fine Playback Volume", WM8741_DACRLSB_ATTENUATION,
+	0, 31, 0, dac_tlv_fine),
+SOC_SINGLE_TLV("Digital Playback Volume", WM8741_DACRMSB_ATTENUATION,
+	0, 31, 1, dac_tlv_coarse),
+SOC_ENUM("DAC Dither", w8741_enum[0]),
+SOC_ENUM("DAC Digital Filter", w8741_enum[1]),
+SOC_ENUM("DAC Phase Invert", w8741_enum[2]),
+SOC_ENUM("DAC Volume Ramp", w8741_enum[3]),
+SOC_ENUM("DAC Soft Mute", w8741_enum[4]),
+};
+
+static int w8741_add_controls(struct snd_soc_codec *codec)
+{
+	struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
+
+	switch (wm8741->pdata.diff_mode) {
+	case WM8741_DIFF_MODE_STEREO:
+	case WM8741_DIFF_MODE_STEREO_REVERSED:
+		snd_soc_add_codec_controls(codec,
+				w8741_snd_controls_stereo,
+				ARRAY_SIZE(w8741_snd_controls_stereo));
+		break;
+	case WM8741_DIFF_MODE_MONO_LEFT:
+		snd_soc_add_codec_controls(codec,
+				w8741_snd_controls_mono_left,
+				ARRAY_SIZE(w8741_snd_controls_mono_left));
+		break;
+	case WM8741_DIFF_MODE_MONO_RIGHT:
+		snd_soc_add_codec_controls(codec,
+				w8741_snd_controls_mono_right,
+				ARRAY_SIZE(w8741_snd_controls_mono_right));
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int digidac1_soundcard_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_pcm_runtime *wm8741_rtd;
+	struct snd_soc_codec *wm8741_codec;
+	struct snd_card *sound_card = card->snd_card;
+	struct snd_kcontrol *kctl;
+	int ret;
+
+	wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
+	if (!wm8741_rtd) {
+		dev_warn(card->dev, "digidac1_soundcard_init: couldn't get wm8741 rtd\n");
+		return -EFAULT;
+	}
+	wm8741_codec = wm8741_rtd->codec;
+	ret = w8741_add_controls(wm8741_codec);
+	if (ret < 0)
+		dev_warn(card->dev, "Failed to add new wm8741 controls: %d\n",
+		ret);
+
+	/* enable TX output */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
+
+	kctl = snd_soc_card_get_kcontrol(card,
+		"Playback Volume");
+	if (kctl) {
+		kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
+		snd_ctl_remove(sound_card, kctl);
+		}
+	kctl = snd_soc_card_get_kcontrol(card,
+		"Fine Playback Volume");
+	if (kctl) {
+		kctl->vd[0].access = SNDRV_CTL_ELEM_ACCESS_READWRITE;
+		snd_ctl_remove(sound_card, kctl);
+		}
+	return 0;
+}
+
+static int digidac1_soundcard_startup(struct snd_pcm_substream *substream)
+{
+	/* turn on wm8804 digital output */
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_pcm_runtime *wm8741_rtd;
+	struct snd_soc_codec *wm8741_codec;
+
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x00);
+	wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
+	if (!wm8741_rtd) {
+		dev_warn(card->dev, "digidac1_soundcard_startup: couldn't get WM8741 rtd\n");
+		return -EFAULT;
+	}
+	wm8741_codec = wm8741_rtd->codec;
+
+	/* latch wm8741 level */
+	snd_soc_update_bits(wm8741_codec, WM8741_DACLLSB_ATTENUATION,
+		WM8741_UPDATELL, WM8741_UPDATELL);
+	snd_soc_update_bits(wm8741_codec, WM8741_DACLMSB_ATTENUATION,
+		WM8741_UPDATELM, WM8741_UPDATELM);
+	snd_soc_update_bits(wm8741_codec, WM8741_DACRLSB_ATTENUATION,
+		WM8741_UPDATERL, WM8741_UPDATERL);
+	snd_soc_update_bits(wm8741_codec, WM8741_DACRMSB_ATTENUATION,
+		WM8741_UPDATERM, WM8741_UPDATERM);
+
+	return 0;
+}
+
+static void digidac1_soundcard_shutdown(struct snd_pcm_substream *substream)
+{
+	/* turn off wm8804 digital output */
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec *codec = rtd->codec;
+
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x3c, 0x3c);
+}
+
+static int digidac1_soundcard_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_codec *codec = rtd->codec;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_pcm_runtime *wm8741_rtd;
+	struct snd_soc_codec *wm8741_codec;
+
+	int sysclk = 27000000;
+	long mclk_freq = 0;
+	int mclk_div = 1;
+	int sampling_freq = 1;
+	int ret;
+
+	wm8741_rtd = snd_soc_get_pcm_runtime(card, card->dai_link[1].name);
+	if (!wm8741_rtd) {
+		dev_warn(card->dev, "digidac1_soundcard_hw_params: couldn't get WM8741 rtd\n");
+		return -EFAULT;
+	}
+	wm8741_codec = wm8741_rtd->codec;
+	samplerate = params_rate(params);
+
+	if (samplerate <= 96000) {
+		mclk_freq = samplerate*256;
+		mclk_div = WM8804_MCLKDIV_256FS;
+	} else {
+		mclk_freq = samplerate*128;
+		mclk_div = WM8804_MCLKDIV_128FS;
+		}
+
+	switch (samplerate) {
+	case 32000:
+		sampling_freq = 0x03;
+		break;
+	case 44100:
+		sampling_freq = 0x00;
+		break;
+	case 48000:
+		sampling_freq = 0x02;
+		break;
+	case 88200:
+		sampling_freq = 0x08;
+		break;
+	case 96000:
+		sampling_freq = 0x0a;
+		break;
+	case 176400:
+		sampling_freq = 0x0c;
+		break;
+	case 192000:
+		sampling_freq = 0x0e;
+		break;
+	default:
+		dev_err(codec->dev,
+		"Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
+		samplerate);
+	}
+
+	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
+	snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
+		sysclk, SND_SOC_CLOCK_OUT);
+	if (ret < 0) {
+		dev_err(codec->dev,
+		"Failed to set WM8804 SYSCLK: %d\n", ret);
+		return ret;
+	}
+	/* Enable wm8804 TX output */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x0);
+
+	/* wm8804 Power on */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
+
+	/* wm8804 set sampling frequency status bits */
+	snd_soc_update_bits(codec, WM8804_SPDTX4, 0x0f, sampling_freq);
+
+	/* Now update wm8741 registers for the correct oversampling */
+	if (samplerate <= 48000)
+		snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
+		 WM8741_OSR_MASK, 0x00);
+	else if (samplerate <= 96000)
+		snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
+		 WM8741_OSR_MASK, 0x20);
+	else
+		snd_soc_update_bits(wm8741_codec, WM8741_MODE_CONTROL_1,
+		 WM8741_OSR_MASK, 0x40);
+
+	/* wm8741 bit size */
+	switch (params_width(params)) {
+	case 16:
+		snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x00);
+		break;
+	case 20:
+		snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x01);
+		break;
+	case 24:
+		snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x02);
+		break;
+	case 32:
+		snd_soc_update_bits(wm8741_codec, WM8741_FORMAT_CONTROL,
+		 WM8741_IWL_MASK, 0x03);
+		break;
+	default:
+		dev_dbg(codec->dev, "wm8741_hw_params:    Unsupported bit size param = %d",
+			params_width(params));
+		return -EINVAL;
+	}
+
+	return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+/* machine stream operations */
+static struct snd_soc_ops digidac1_soundcard_ops = {
+	.hw_params	= digidac1_soundcard_hw_params,
+	.startup	= digidac1_soundcard_startup,
+	.shutdown	= digidac1_soundcard_shutdown,
+};
+
+static struct snd_soc_dai_link digidac1_soundcard_dai[] = {
+	{
+	.name		= "RRA DigiDAC1",
+	.stream_name	= "RRA DigiDAC1 HiFi",
+	.cpu_dai_name	= "bcm2708-i2s.0",
+	.codec_dai_name	= "wm8804-spdif",
+	.platform_name	= "bcm2708-i2s.0",
+	.codec_name	= "wm8804.1-003b",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBM_CFM,
+	.ops		= &digidac1_soundcard_ops,
+	.init		= digidac1_soundcard_init,
+	},
+	{
+	.name		= "RRA DigiDAC11",
+	.stream_name	= "RRA DigiDAC11 HiFi",
+	.cpu_dai_name	= "wm8804-spdif",
+	.codec_dai_name	= "wm8741",
+	.codec_name	= "wm8741.1-001a",
+	.dai_fmt	= SND_SOC_DAIFMT_I2S
+			| SND_SOC_DAIFMT_NB_NF
+			| SND_SOC_DAIFMT_CBS_CFS,
+	},
+};
+
+/* audio machine driver */
+static struct snd_soc_card digidac1_soundcard = {
+	.name		= "digidac1-soundcard",
+	.owner		= THIS_MODULE,
+	.dai_link	= digidac1_soundcard_dai,
+	.num_links	= ARRAY_SIZE(digidac1_soundcard_dai),
+};
+
+static int digidac1_soundcard_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	digidac1_soundcard.dev = &pdev->dev;
+
+	if (pdev->dev.of_node) {
+		struct device_node *i2s_node;
+		struct snd_soc_dai_link *dai = &digidac1_soundcard_dai[0];
+
+		i2s_node = of_parse_phandle(pdev->dev.of_node,
+					"i2s-controller", 0);
+
+		if (i2s_node) {
+			dai->cpu_dai_name = NULL;
+			dai->cpu_of_node = i2s_node;
+			dai->platform_name = NULL;
+			dai->platform_of_node = i2s_node;
+		}
+	}
+
+	ret = snd_soc_register_card(&digidac1_soundcard);
+	if (ret)
+		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+		 ret);
+
+	return ret;
+}
+
+static int digidac1_soundcard_remove(struct platform_device *pdev)
+{
+	return snd_soc_unregister_card(&digidac1_soundcard);
+}
+
+static const struct of_device_id digidac1_soundcard_of_match[] = {
+	{ .compatible = "rra,digidac1-soundcard", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, digidac1_soundcard_of_match);
+
+static struct platform_driver digidac1_soundcard_driver = {
+	.driver = {
+			.name		= "digidac1-audio",
+			.owner		= THIS_MODULE,
+			.of_match_table	= digidac1_soundcard_of_match,
+	},
+	.probe		= digidac1_soundcard_probe,
+	.remove		= digidac1_soundcard_remove,
+};
+
+module_platform_driver(digidac1_soundcard_driver);
+
+MODULE_AUTHOR("José M. Tasende <vintage@redrocksaudio.es>");
+MODULE_DESCRIPTION("ASoC Driver for RRA DigiDAC1");
+MODULE_LICENSE("GPL v2");
