950-0078-ASoC-Add-driver-for-Cirrus-Logic-Audio-Card.patch

From 2c3e4f06b7e7d34a03e747367c26805fbf89a4ac Mon Sep 17 00:00:00 2001
From: Matthias Reichl <hias@horus.com>
Date: Sun, 22 Jan 2017 12:49:37 +0100
Subject: [PATCH] ASoC: Add driver for Cirrus Logic Audio Card

Note: due to problems with deferred probing of regulators
the following softdep should be added to a modprobe.d file

softdep arizona-spi pre: arizona-ldo1

Signed-off-by: Matthias Reichl <hias@horus.com>
---
 sound/soc/bcm/rpi-cirrus.c | 1029 ++++++++++++++++++++++++++++++++++++
 1 file changed, 1029 insertions(+)
 create mode 100644 sound/soc/bcm/rpi-cirrus.c

--- /dev/null
+++ b/sound/soc/bcm/rpi-cirrus.c
@@ -0,0 +1,1029 @@
+/*
+ * ASoC machine driver for Cirrus Logic Audio Card
+ * (with WM5102 and WM8804 codecs)
+ *
+ * Copyright 2015-2017 Matthias Reichl <hias@horus.com>
+ *
+ * Based on rpi-cirrus-sound-pi driver (c) Wolfson / Cirrus Logic Inc.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <sound/pcm_params.h>
+
+#include <linux/mfd/arizona/registers.h>
+
+#include "../codecs/wm5102.h"
+#include "../codecs/wm8804.h"
+
+#define WM8804_CLKOUT_HZ 12000000
+
+#define RPI_CIRRUS_DEFAULT_RATE 44100
+#define WM5102_MAX_SYSCLK_1 49152000 /* max sysclk for 4K family */
+#define WM5102_MAX_SYSCLK_2 45158400 /* max sysclk for 11.025K family */
+
+static inline unsigned int calc_sysclk(unsigned int rate)
+{
+	return (rate % 4000) ? WM5102_MAX_SYSCLK_2 : WM5102_MAX_SYSCLK_1;
+}
+
+enum {
+	DAI_WM5102 = 0,
+	DAI_WM8804,
+};
+
+struct rpi_cirrus_priv {
+	/* mutex for synchronzing FLL1 access with DAPM */
+	struct mutex lock;
+	unsigned int card_rate;
+	int sync_path_enable;
+	int fll1_freq; /* negative means RefClock in spdif rx case */
+
+	/* track hw params/free for substreams */
+	unsigned int params_set;
+	unsigned int min_rate_idx, max_rate_idx;
+	unsigned char iec958_status[4];
+};
+
+/* helper functions */
+static inline struct snd_soc_pcm_runtime *get_wm5102_runtime(
+	struct snd_soc_card *card) {
+	return snd_soc_get_pcm_runtime(card, card->dai_link[DAI_WM5102].name);
+}
+
+static inline struct snd_soc_pcm_runtime *get_wm8804_runtime(
+	struct snd_soc_card *card) {
+	return snd_soc_get_pcm_runtime(card, card->dai_link[DAI_WM8804].name);
+}
+
+
+struct rate_info {
+	unsigned int value;
+	char *text;
+};
+
+static struct rate_info min_rates[] = {
+	{     0, "off"},
+	{ 32000, "32kHz"},
+	{ 44100, "44.1kHz"}
+};
+
+#define NUM_MIN_RATES ARRAY_SIZE(min_rates)
+
+static int rpi_cirrus_min_rate_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = NUM_MIN_RATES;
+
+	if (uinfo->value.enumerated.item >= NUM_MIN_RATES)
+		uinfo->value.enumerated.item = NUM_MIN_RATES - 1;
+	strcpy(uinfo->value.enumerated.name,
+		min_rates[uinfo->value.enumerated.item].text);
+	return 0;
+}
+
+static int rpi_cirrus_min_rate_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+
+	ucontrol->value.enumerated.item[0] = priv->min_rate_idx;
+	return 0;
+}
+
+static int rpi_cirrus_min_rate_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	int changed = 0;
+
+	if (priv->min_rate_idx != ucontrol->value.enumerated.item[0]) {
+		changed = 1;
+		priv->min_rate_idx = ucontrol->value.enumerated.item[0];
+	}
+
+	return changed;
+}
+
+static struct rate_info max_rates[] = {
+	{     0, "off"},
+	{ 48000, "48kHz"},
+	{ 96000, "96kHz"}
+};
+
+#define NUM_MAX_RATES ARRAY_SIZE(max_rates)
+
+static int rpi_cirrus_max_rate_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = NUM_MAX_RATES;
+	if (uinfo->value.enumerated.item >= NUM_MAX_RATES)
+		uinfo->value.enumerated.item = NUM_MAX_RATES - 1;
+	strcpy(uinfo->value.enumerated.name,
+		max_rates[uinfo->value.enumerated.item].text);
+	return 0;
+}
+
+static int rpi_cirrus_max_rate_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+
+	ucontrol->value.enumerated.item[0] = priv->max_rate_idx;
+	return 0;
+}
+
+static int rpi_cirrus_max_rate_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	int changed = 0;
+
+	if (priv->max_rate_idx != ucontrol->value.enumerated.item[0]) {
+		changed = 1;
+		priv->max_rate_idx = ucontrol->value.enumerated.item[0];
+	}
+
+	return changed;
+}
+
+static int rpi_cirrus_spdif_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+	uinfo->count = 1;
+	return 0;
+}
+
+static int rpi_cirrus_spdif_playback_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	int i;
+
+	for (i = 0; i < 4; i++)
+		ucontrol->value.iec958.status[i] = priv->iec958_status[i];
+
+	return 0;
+}
+
+static int rpi_cirrus_spdif_playback_put(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct snd_soc_component *wm8804_component =
+		get_wm8804_runtime(card)->codec_dai->component;
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	unsigned char *stat = priv->iec958_status;
+	unsigned char *ctrl_stat = ucontrol->value.iec958.status;
+	unsigned int mask;
+	int i, changed = 0;
+
+	for (i = 0; i < 4; i++) {
+		mask = (i == 3) ? 0x3f : 0xff;
+		if ((ctrl_stat[i] & mask) != (stat[i] & mask)) {
+			changed = 1;
+			stat[i] = ctrl_stat[i] & mask;
+			snd_soc_component_update_bits(wm8804_component,
+				WM8804_SPDTX1 + i, mask, stat[i]);
+		}
+	}
+
+	return changed;
+}
+
+static int rpi_cirrus_spdif_mask_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	ucontrol->value.iec958.status[0] = 0xff;
+	ucontrol->value.iec958.status[1] = 0xff;
+	ucontrol->value.iec958.status[2] = 0xff;
+	ucontrol->value.iec958.status[3] = 0x3f;
+
+	return 0;
+}
+
+static int rpi_cirrus_spdif_capture_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct snd_soc_component *wm8804_component =
+		get_wm8804_runtime(card)->codec_dai->component;
+	unsigned int val, mask;
+	int i, ret;
+
+	for (i = 0; i < 4; i++) {
+		ret = snd_soc_component_read(wm8804_component,
+			WM8804_RXCHAN1 + i, &val);
+		if (ret)
+			return ret;
+		mask = (i == 3) ? 0x3f : 0xff;
+		ucontrol->value.iec958.status[i] = val & mask;
+	}
+
+	return 0;
+}
+
+#define SPDIF_FLAG_CTRL(desc, reg, bit, invert) \
+{ \
+		.access =  SNDRV_CTL_ELEM_ACCESS_READ \
+			   | SNDRV_CTL_ELEM_ACCESS_VOLATILE, \
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER, \
+		.name =    SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) \
+				desc " Flag", \
+		.info =    snd_ctl_boolean_mono_info, \
+		.get =     rpi_cirrus_spdif_status_flag_get, \
+		.private_value = \
+			(bit) | ((reg) << 8) | ((invert) << 16) \
+}
+
+static int rpi_cirrus_spdif_status_flag_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct snd_soc_component *wm8804_component =
+		get_wm8804_runtime(card)->codec_dai->component;
+
+	unsigned int bit = kcontrol->private_value & 0xff;
+	unsigned int reg = (kcontrol->private_value >> 8) & 0xff;
+	unsigned int invert = (kcontrol->private_value >> 16) & 0xff;
+	int ret;
+	unsigned int val;
+	bool flag;
+
+	ret = snd_soc_component_read(wm8804_component, reg, &val);
+	if (ret)
+		return ret;
+
+	flag = val & (1 << bit);
+
+	ucontrol->value.integer.value[0] = invert ? !flag : flag;
+
+	return 0;
+}
+
+static const char * const recovered_frequency_texts[] = {
+	"176.4/192 kHz",
+	"88.2/96 kHz",
+	"44.1/48 kHz",
+	"32 kHz"
+};
+
+#define NUM_RECOVERED_FREQUENCIES \
+	ARRAY_SIZE(recovered_frequency_texts)
+
+static int rpi_cirrus_recovered_frequency_info(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	uinfo->count = 1;
+	uinfo->value.enumerated.items = NUM_RECOVERED_FREQUENCIES;
+	if (uinfo->value.enumerated.item >= NUM_RECOVERED_FREQUENCIES)
+		uinfo->value.enumerated.item = NUM_RECOVERED_FREQUENCIES - 1;
+	strcpy(uinfo->value.enumerated.name,
+		recovered_frequency_texts[uinfo->value.enumerated.item]);
+	return 0;
+}
+
+static int rpi_cirrus_recovered_frequency_get(struct snd_kcontrol *kcontrol,
+	struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
+	struct snd_soc_component *wm8804_component =
+		get_wm8804_runtime(card)->codec_dai->component;
+	unsigned int val;
+	int ret;
+
+	ret = snd_soc_component_read(wm8804_component, WM8804_SPDSTAT, &val);
+	if (ret)
+		return ret;
+
+	ucontrol->value.enumerated.item[0] = (val >> 4) & 0x03;
+	return 0;
+}
+
+static const struct snd_kcontrol_new rpi_cirrus_controls[] = {
+	{
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =    "Min Sample Rate",
+		.info =    rpi_cirrus_min_rate_info,
+		.get =     rpi_cirrus_min_rate_get,
+		.put =     rpi_cirrus_min_rate_put,
+	},
+	{
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =    "Max Sample Rate",
+		.info =    rpi_cirrus_max_rate_info,
+		.get =     rpi_cirrus_max_rate_get,
+		.put =     rpi_cirrus_max_rate_put,
+	},
+	{
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =    SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+		.info =    rpi_cirrus_spdif_info,
+		.get =     rpi_cirrus_spdif_playback_get,
+		.put =     rpi_cirrus_spdif_playback_put,
+	},
+	{
+		.access =  SNDRV_CTL_ELEM_ACCESS_READ
+			   | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =    SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
+		.info =    rpi_cirrus_spdif_info,
+		.get =     rpi_cirrus_spdif_capture_get,
+	},
+	{
+		.access =  SNDRV_CTL_ELEM_ACCESS_READ,
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =    SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
+		.info =    rpi_cirrus_spdif_info,
+		.get =     rpi_cirrus_spdif_mask_get,
+	},
+	{
+		.access =  SNDRV_CTL_ELEM_ACCESS_READ
+			   | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.iface =   SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name =    SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE)
+				"Recovered Frequency",
+		.info =    rpi_cirrus_recovered_frequency_info,
+		.get =     rpi_cirrus_recovered_frequency_get,
+	},
+	SPDIF_FLAG_CTRL("Audio", WM8804_SPDSTAT, 0, 1),
+	SPDIF_FLAG_CTRL("Non-PCM", WM8804_SPDSTAT, 1, 0),
+	SPDIF_FLAG_CTRL("Copyright", WM8804_SPDSTAT, 2, 1),
+	SPDIF_FLAG_CTRL("De-Emphasis", WM8804_SPDSTAT, 3, 0),
+	SPDIF_FLAG_CTRL("Lock", WM8804_SPDSTAT, 6, 1),
+	SPDIF_FLAG_CTRL("Invalid", WM8804_INTSTAT, 1, 0),
+	SPDIF_FLAG_CTRL("TransErr", WM8804_INTSTAT, 3, 0),
+};
+
+static const char * const linein_micbias_texts[] = {
+	"off", "on",
+};
+
+static SOC_ENUM_SINGLE_VIRT_DECL(linein_micbias_enum,
+	linein_micbias_texts);
+
+static const struct snd_kcontrol_new linein_micbias_mux =
+	SOC_DAPM_ENUM("Route", linein_micbias_enum);
+
+static int rpi_cirrus_spdif_rx_enable_event(struct snd_soc_dapm_widget *w,
+	struct snd_kcontrol *kcontrol, int event);
+
+const struct snd_soc_dapm_widget rpi_cirrus_dapm_widgets[] = {
+	SND_SOC_DAPM_MIC("DMIC", NULL),
+	SND_SOC_DAPM_MIC("Headset Mic", NULL),
+	SND_SOC_DAPM_INPUT("Line Input"),
+	SND_SOC_DAPM_MIC("Line Input with Micbias", NULL),
+	SND_SOC_DAPM_MUX("Line Input Micbias", SND_SOC_NOPM, 0, 0,
+		&linein_micbias_mux),
+	SND_SOC_DAPM_INPUT("dummy SPDIF in"),
+	SND_SOC_DAPM_PGA_E("dummy SPDIFRX", SND_SOC_NOPM, 0, 0, NULL, 0,
+		rpi_cirrus_spdif_rx_enable_event,
+		SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
+	SND_SOC_DAPM_INPUT("Dummy Input"),
+	SND_SOC_DAPM_OUTPUT("Dummy Output"),
+};
+
+const struct snd_soc_dapm_route rpi_cirrus_dapm_routes[] = {
+	{ "IN1L", NULL, "Headset Mic" },
+	{ "IN1R", NULL, "Headset Mic" },
+	{ "Headset Mic", NULL, "MICBIAS1" },
+
+	{ "IN2L", NULL, "DMIC" },
+	{ "IN2R", NULL, "DMIC" },
+	{ "DMIC", NULL, "MICBIAS2" },
+
+	{ "IN3L", NULL, "Line Input Micbias" },
+	{ "IN3R", NULL, "Line Input Micbias" },
+
+	{ "Line Input Micbias", "off", "Line Input" },
+	{ "Line Input Micbias", "on", "Line Input with Micbias" },
+
+	/* Make sure MICVDD is enabled, otherwise we get noise */
+	{ "Line Input", NULL, "MICVDD" },
+	{ "Line Input with Micbias", NULL, "MICBIAS3" },
+
+	/* Dummy routes to check whether SPDIF RX is enabled or not */
+	{"dummy SPDIFRX", NULL, "dummy SPDIF in"},
+	{"AIFTX", NULL, "dummy SPDIFRX"},
+
+	/*
+	 * Dummy routes to keep wm5102 from staying off on
+	 * playback/capture if all mixers are off.
+	 */
+	{ "Dummy Output", NULL, "AIF1RX1" },
+	{ "Dummy Output", NULL, "AIF1RX2" },
+	{ "AIF1TX1", NULL, "Dummy Input" },
+	{ "AIF1TX2", NULL, "Dummy Input" },
+};
+
+static int rpi_cirrus_clear_flls(struct snd_soc_card *card,
+	struct snd_soc_component *wm5102_component) {
+
+	int ret1, ret2;
+
+	ret1 = snd_soc_component_set_pll(wm5102_component,
+		WM5102_FLL1, ARIZONA_FLL_SRC_NONE, 0, 0);
+	ret2 = snd_soc_component_set_pll(wm5102_component,
+		WM5102_FLL1_REFCLK, ARIZONA_FLL_SRC_NONE, 0, 0);
+
+	if (ret1) {
+		dev_warn(card->dev,
+			"setting FLL1 to zero failed: %d\n", ret1);
+		return ret1;
+	}
+	if (ret2) {
+		dev_warn(card->dev,
+			"setting FLL1_REFCLK to zero failed: %d\n", ret2);
+		return ret2;
+	}
+	return 0;
+}
+
+static int rpi_cirrus_set_fll(struct snd_soc_card *card,
+	struct snd_soc_component *wm5102_component, unsigned int clk_freq)
+{
+	int ret = snd_soc_component_set_pll(wm5102_component,
+		WM5102_FLL1,
+		ARIZONA_CLK_SRC_MCLK1,
+		WM8804_CLKOUT_HZ,
+		clk_freq);
+	if (ret)
+		dev_err(card->dev, "Failed to set FLL1 to %d: %d\n",
+			clk_freq, ret);
+
+	usleep_range(1000, 2000);
+	return ret;
+}
+
+static int rpi_cirrus_set_fll_refclk(struct snd_soc_card *card,
+	struct snd_soc_component *wm5102_component,
+	unsigned int clk_freq, unsigned int aif2_freq)
+{
+	int ret = snd_soc_component_set_pll(wm5102_component,
+		WM5102_FLL1_REFCLK,
+		ARIZONA_CLK_SRC_MCLK1,
+		WM8804_CLKOUT_HZ,
+		clk_freq);
+	if (ret) {
+		dev_err(card->dev,
+			"Failed to set FLL1_REFCLK to %d: %d\n",
+			clk_freq, ret);
+		return ret;
+	}
+
+	ret = snd_soc_component_set_pll(wm5102_component,
+		WM5102_FLL1,
+		ARIZONA_CLK_SRC_AIF2BCLK,
+		aif2_freq, clk_freq);
+	if (ret)
+		dev_err(card->dev,
+			"Failed to set FLL1 with Sync Clock %d to %d: %d\n",
+			aif2_freq, clk_freq, ret);
+
+	usleep_range(1000, 2000);
+	return ret;
+}
+
+static int rpi_cirrus_spdif_rx_enable_event(struct snd_soc_dapm_widget *w,
+	struct snd_kcontrol *kcontrol, int event)
+{
+	struct snd_soc_card *card = w->dapm->card;
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	struct snd_soc_component *wm5102_component =
+		get_wm5102_runtime(card)->codec_dai->component;
+
+	unsigned int clk_freq, aif2_freq;
+	int ret = 0;
+
+	switch (event) {
+	case SND_SOC_DAPM_POST_PMU:
+		mutex_lock(&priv->lock);
+
+		/* Enable sync path in case of SPDIF capture use case */
+
+		clk_freq = calc_sysclk(priv->card_rate);
+		aif2_freq = 64 * priv->card_rate;
+
+		dev_dbg(card->dev,
+			"spdif_rx: changing FLL1 to use Ref Clock clk: %d spdif: %d\n",
+			clk_freq, aif2_freq);
+
+		ret = rpi_cirrus_clear_flls(card, wm5102_component);
+		if (ret) {
+			dev_err(card->dev, "spdif_rx: failed to clear FLLs\n");
+			goto out;
+		}
+
+		ret = rpi_cirrus_set_fll_refclk(card, wm5102_component,
+			clk_freq, aif2_freq);
+
+		if (ret) {
+			dev_err(card->dev, "spdif_rx: failed to set FLLs\n");
+			goto out;
+		}
+
+		/* set to negative to indicate we're doing spdif rx */
+		priv->fll1_freq = -clk_freq;
+		priv->sync_path_enable = 1;
+		break;
+
+	case SND_SOC_DAPM_POST_PMD:
+		mutex_lock(&priv->lock);
+		priv->sync_path_enable = 0;
+		break;
+
+	default:
+		return 0;
+	}
+
+out:
+	mutex_unlock(&priv->lock);
+	return ret;
+}
+
+static int rpi_cirrus_set_bias_level(struct snd_soc_card *card,
+	struct snd_soc_dapm_context *dapm,
+	enum snd_soc_bias_level level)
+{
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	struct snd_soc_pcm_runtime *wm5102_runtime = get_wm5102_runtime(card);
+	struct snd_soc_component *wm5102_component =
+		wm5102_runtime->codec_dai->component;
+
+	int ret = 0;
+	unsigned int clk_freq;
+
+	if (dapm->dev != wm5102_runtime->codec_dai->dev)
+		return 0;
+
+	switch (level) {
+	case SND_SOC_BIAS_PREPARE:
+		if (dapm->bias_level == SND_SOC_BIAS_ON)
+			break;
+
+		mutex_lock(&priv->lock);
+
+		if (!priv->sync_path_enable) {
+			clk_freq = calc_sysclk(priv->card_rate);
+
+			dev_dbg(card->dev,
+				"set_bias: changing FLL1 from %d to %d\n",
+				priv->fll1_freq, clk_freq);
+
+			ret = rpi_cirrus_set_fll(card,
+				wm5102_component, clk_freq);
+			if (ret)
+				dev_err(card->dev,
+					"set_bias: Failed to set FLL1\n");
+			else
+				priv->fll1_freq = clk_freq;
+		}
+		mutex_unlock(&priv->lock);
+		break;
+	default:
+		break;
+	}
+
+	return ret;
+}
+
+static int rpi_cirrus_set_bias_level_post(struct snd_soc_card *card,
+	struct snd_soc_dapm_context *dapm,
+	enum snd_soc_bias_level level)
+{
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	struct snd_soc_pcm_runtime *wm5102_runtime = get_wm5102_runtime(card);
+	struct snd_soc_component *wm5102_component =
+		wm5102_runtime->codec_dai->component;
+
+	if (dapm->dev != wm5102_runtime->codec_dai->dev)
+		return 0;
+
+	switch (level) {
+	case SND_SOC_BIAS_STANDBY:
+		mutex_lock(&priv->lock);
+
+		dev_dbg(card->dev,
+			"set_bias_post: changing FLL1 from %d to off\n",
+				priv->fll1_freq);
+
+		if (rpi_cirrus_clear_flls(card, wm5102_component))
+			dev_err(card->dev,
+				"set_bias_post: failed to clear FLLs\n");
+		else
+			priv->fll1_freq = 0;
+
+		mutex_unlock(&priv->lock);
+
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int rpi_cirrus_set_wm8804_pll(struct snd_soc_card *card,
+	struct snd_soc_dai *wm8804_dai, unsigned int rate)
+{
+	int ret;
+
+	/* use 256fs */
+	unsigned int clk_freq = rate * 256;
+
+	ret = snd_soc_dai_set_pll(wm8804_dai, 0, 0,
+		WM8804_CLKOUT_HZ, clk_freq);
+	if (ret) {
+		dev_err(card->dev,
+			"Failed to set WM8804 PLL to %d: %d\n", clk_freq, ret);
+		return ret;
+	}
+
+	/* Set MCLK as PLL Output */
+	ret = snd_soc_dai_set_sysclk(wm8804_dai,
+		WM8804_TX_CLKSRC_PLL, clk_freq, 0);
+	if (ret) {
+		dev_err(card->dev,
+			"Failed to set MCLK as PLL Output: %d\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
+static int rpi_cirrus_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_card *card = rtd->card;
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	unsigned int min_rate = min_rates[priv->min_rate_idx].value;
+	unsigned int max_rate = max_rates[priv->max_rate_idx].value;
+
+	if (min_rate || max_rate) {
+		if (max_rate == 0)
+			max_rate = UINT_MAX;
+
+		dev_dbg(card->dev,
+			"startup: limiting rate to %u-%u\n",
+			min_rate, max_rate);
+
+		snd_pcm_hw_constraint_minmax(substream->runtime,
+			SNDRV_PCM_HW_PARAM_RATE, min_rate, max_rate);
+	}
+
+	return 0;
+}
+
+static struct snd_soc_pcm_stream rpi_cirrus_dai_link2_params = {
+	.formats = SNDRV_PCM_FMTBIT_S24_LE,
+	.channels_min = 2,
+	.channels_max = 2,
+	.rate_min = RPI_CIRRUS_DEFAULT_RATE,
+	.rate_max = RPI_CIRRUS_DEFAULT_RATE,
+};
+
+static int rpi_cirrus_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_card *card = rtd->card;
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	struct snd_soc_dai *bcm_i2s_dai = rtd->cpu_dai;
+	struct snd_soc_component *wm5102_component = rtd->codec_dai->component;
+	struct snd_soc_dai *wm8804_dai = get_wm8804_runtime(card)->codec_dai;
+
+	int ret;
+
+	unsigned int width = snd_pcm_format_physical_width(
+		params_format(params));
+	unsigned int rate = params_rate(params);
+	unsigned int clk_freq = calc_sysclk(rate);
+
+	mutex_lock(&priv->lock);
+
+	dev_dbg(card->dev, "hw_params: setting rate to %d\n", rate);
+
+	ret = snd_soc_dai_set_bclk_ratio(bcm_i2s_dai, 2 * width);
+	if (ret) {
+		dev_err(card->dev, "set_bclk_ratio failed: %d\n", ret);
+		goto out;
+	}
+
+	ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0x03, 0x03, 2, width);
+	if (ret) {
+		dev_err(card->dev, "set_tdm_slot failed: %d\n", ret);
+		goto out;
+	}
+
+	/* WM8804 supports sample rates from 32k only */
+	if (rate >= 32000) {
+		ret = rpi_cirrus_set_wm8804_pll(card, wm8804_dai, rate);
+		if (ret)
+			goto out;
+	}
+
+	ret = snd_soc_component_set_sysclk(wm5102_component,
+		ARIZONA_CLK_SYSCLK,
+		ARIZONA_CLK_SRC_FLL1,
+		clk_freq,
+		SND_SOC_CLOCK_IN);
+	if (ret) {
+		dev_err(card->dev, "Failed to set SYSCLK: %d\n", ret);
+		goto out;
+	}
+
+	if ((priv->fll1_freq > 0) && (priv->fll1_freq != clk_freq)) {
+		dev_dbg(card->dev,
+			"hw_params: changing FLL1 from %d to %d\n",
+			priv->fll1_freq, clk_freq);
+
+		if (rpi_cirrus_clear_flls(card, wm5102_component)) {
+			dev_err(card->dev, "hw_params: failed to clear FLLs\n");
+			goto out;
+		}
+
+		if (rpi_cirrus_set_fll(card, wm5102_component, clk_freq)) {
+			dev_err(card->dev, "hw_params: failed to set FLL\n");
+			goto out;
+		}
+
+		priv->fll1_freq = clk_freq;
+	}
+
+	priv->card_rate = rate;
+	rpi_cirrus_dai_link2_params.rate_min = rate;
+	rpi_cirrus_dai_link2_params.rate_max = rate;
+
+	priv->params_set |= 1 << substream->stream;
+
+out:
+	mutex_unlock(&priv->lock);
+
+	return ret;
+}
+
+static int rpi_cirrus_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_card *card = rtd->card;
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	struct snd_soc_component *wm5102_component = rtd->codec_dai->component;
+	int ret;
+	unsigned int old_params_set = priv->params_set;
+
+	priv->params_set &= ~(1 << substream->stream);
+
+	/* disable sysclk if this was the last open stream */
+	if (priv->params_set == 0 && old_params_set) {
+		dev_dbg(card->dev,
+			"hw_free: Setting SYSCLK to Zero\n");
+
+		ret = snd_soc_component_set_sysclk(wm5102_component,
+			ARIZONA_CLK_SYSCLK,
+			ARIZONA_CLK_SRC_FLL1,
+			0,
+			SND_SOC_CLOCK_IN);
+		if (ret)
+			dev_err(card->dev,
+				"hw_free: Failed to set SYSCLK to Zero: %d\n",
+				ret);
+	}
+	return 0;
+}
+
+static int rpi_cirrus_init_wm5102(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_component *component = rtd->codec_dai->component;
+	int ret;
+
+	/* no 32kHz input, derive it from sysclk if needed  */
+	snd_soc_component_update_bits(component,
+			ARIZONA_CLOCK_32K_1, ARIZONA_CLK_32K_SRC_MASK, 2);
+
+	if (rpi_cirrus_clear_flls(rtd->card, component))
+		dev_warn(rtd->card->dev,
+			"init_wm5102: failed to clear FLLs\n");
+
+	ret = snd_soc_component_set_sysclk(component,
+		ARIZONA_CLK_SYSCLK, ARIZONA_CLK_SRC_FLL1,
+		0, SND_SOC_CLOCK_IN);
+	if (ret) {
+		dev_err(rtd->card->dev,
+			"Failed to set SYSCLK to Zero: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rpi_cirrus_init_wm8804(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_component *component = codec_dai->component;
+	struct snd_soc_card *card = rtd->card;
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	unsigned int val, mask;
+	int i, ret;
+
+	for (i = 0; i < 4; i++) {
+		ret = snd_soc_component_read(component,
+			WM8804_SPDTX1 + i, &val);
+		if (ret)
+			return ret;
+		mask = (i == 3) ? 0x3f : 0xff;
+		priv->iec958_status[i] = val & mask;
+	}
+
+	/* Setup for 256fs */
+	ret = snd_soc_dai_set_clkdiv(codec_dai,
+		WM8804_MCLK_DIV, WM8804_MCLKDIV_256FS);
+	if (ret) {
+		dev_err(card->dev,
+			"init_wm8804: Failed to set MCLK_DIV to 256fs: %d\n",
+			ret);
+		return ret;
+	}
+
+	/* Output OSC on CLKOUT */
+	ret = snd_soc_dai_set_sysclk(codec_dai,
+		WM8804_CLKOUT_SRC_OSCCLK, WM8804_CLKOUT_HZ, 0);
+	if (ret)
+		dev_err(card->dev,
+			"init_wm8804: Failed to set CLKOUT as OSC Frequency: %d\n",
+			ret);
+
+	/* Init PLL with default samplerate */
+	ret = rpi_cirrus_set_wm8804_pll(card, codec_dai,
+		RPI_CIRRUS_DEFAULT_RATE);
+	if (ret)
+		dev_err(card->dev,
+			"init_wm8804: Failed to setup PLL for %dHz: %d\n",
+			RPI_CIRRUS_DEFAULT_RATE, ret);
+
+	return ret;
+}
+
+static struct snd_soc_ops rpi_cirrus_ops = {
+	.startup = rpi_cirrus_startup,
+	.hw_params = rpi_cirrus_hw_params,
+	.hw_free = rpi_cirrus_hw_free,
+};
+
+static struct snd_soc_dai_link rpi_cirrus_dai[] = {
+	[DAI_WM5102] = {
+		.name		= "WM5102",
+		.stream_name	= "WM5102 AiFi",
+		.codec_dai_name	= "wm5102-aif1",
+		.codec_name	= "wm5102-codec",
+		.dai_fmt	=   SND_SOC_DAIFMT_I2S
+				  | SND_SOC_DAIFMT_NB_NF
+				  | SND_SOC_DAIFMT_CBM_CFM,
+		.ops		= &rpi_cirrus_ops,
+		.init		= rpi_cirrus_init_wm5102,
+	},
+	[DAI_WM8804] = {
+		.name		= "WM5102 SPDIF",
+		.stream_name	= "SPDIF Tx/Rx",
+		.cpu_dai_name	= "wm5102-aif2",
+		.codec_dai_name	= "wm8804-spdif",
+		.codec_name	= "wm8804.1-003b",
+		.dai_fmt	=   SND_SOC_DAIFMT_I2S
+				  | SND_SOC_DAIFMT_NB_NF
+				  | SND_SOC_DAIFMT_CBM_CFM,
+		.ignore_suspend = 1,
+		.params		= &rpi_cirrus_dai_link2_params,
+		.init		= rpi_cirrus_init_wm8804,
+	},
+};
+
+
+static int rpi_cirrus_late_probe(struct snd_soc_card *card)
+{
+	struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+	struct snd_soc_pcm_runtime *wm5102_runtime = get_wm5102_runtime(card);
+	struct snd_soc_pcm_runtime *wm8804_runtime = get_wm8804_runtime(card);
+	int ret;
+
+	dev_dbg(card->dev, "iec958_bits: %02x %02x %02x %02x\n",
+		priv->iec958_status[0],
+		priv->iec958_status[1],
+		priv->iec958_status[2],
+		priv->iec958_status[3]);
+
+	ret = snd_soc_dai_set_sysclk(
+		wm5102_runtime->codec_dai, ARIZONA_CLK_SYSCLK, 0, 0);
+	if (ret) {
+		dev_err(card->dev,
+			"Failed to set WM5102 codec dai clk domain: %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_sysclk(
+		wm8804_runtime->cpu_dai, ARIZONA_CLK_SYSCLK, 0, 0);
+	if (ret)
+		dev_err(card->dev,
+			"Failed to set WM8804 codec dai clk domain: %d\n", ret);
+
+	return ret;
+}
+
+/* audio machine driver */
+static struct snd_soc_card rpi_cirrus_card = {
+	.name			= "RPi-Cirrus",
+	.driver_name		= "RPiCirrus",
+	.owner			= THIS_MODULE,
+	.dai_link		= rpi_cirrus_dai,
+	.num_links		= ARRAY_SIZE(rpi_cirrus_dai),
+	.late_probe		= rpi_cirrus_late_probe,
+	.controls		= rpi_cirrus_controls,
+	.num_controls		= ARRAY_SIZE(rpi_cirrus_controls),
+	.dapm_widgets		= rpi_cirrus_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(rpi_cirrus_dapm_widgets),
+	.dapm_routes		= rpi_cirrus_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(rpi_cirrus_dapm_routes),
+	.set_bias_level		= rpi_cirrus_set_bias_level,
+	.set_bias_level_post	= rpi_cirrus_set_bias_level_post,
+};
+
+static int rpi_cirrus_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct rpi_cirrus_priv *priv;
+	struct device_node *i2s_node;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->min_rate_idx = 1; /* min samplerate 32kHz */
+	priv->card_rate = RPI_CIRRUS_DEFAULT_RATE;
+
+	mutex_init(&priv->lock);
+
+	snd_soc_card_set_drvdata(&rpi_cirrus_card, priv);
+
+	if (!pdev->dev.of_node)
+		return -ENODEV;
+
+	i2s_node = of_parse_phandle(
+			pdev->dev.of_node, "i2s-controller", 0);
+	if (!i2s_node) {
+		dev_err(&pdev->dev, "i2s-controller missing in DT\n");
+		return -ENODEV;
+	}
+
+	rpi_cirrus_dai[DAI_WM5102].cpu_of_node = i2s_node;
+	rpi_cirrus_dai[DAI_WM5102].platform_of_node = i2s_node;
+
+	rpi_cirrus_card.dev = &pdev->dev;
+
+	ret = devm_snd_soc_register_card(&pdev->dev, &rpi_cirrus_card);
+	if (ret) {
+		if (ret == -EPROBE_DEFER)
+			dev_dbg(&pdev->dev,
+				"register card requested probe deferral\n");
+		else
+			dev_err(&pdev->dev,
+				"Failed to register card: %d\n", ret);
+	}
+
+	return ret;
+}
+
+static const struct of_device_id rpi_cirrus_of_match[] = {
+	{ .compatible = "wlf,rpi-cirrus", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rpi_cirrus_of_match);
+
+static struct platform_driver rpi_cirrus_driver = {
+	.driver	= {
+		.name   = "snd-rpi-cirrus",
+		.of_match_table = of_match_ptr(rpi_cirrus_of_match),
+	},
+	.probe	= rpi_cirrus_probe,
+};
+
+module_platform_driver(rpi_cirrus_driver);
+
+MODULE_AUTHOR("Matthias Reichl <hias@horus.com>");
+MODULE_DESCRIPTION("ASoC driver for Cirrus Logic Audio Card");
+MODULE_LICENSE("GPL");