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From 01c84e09a331a3b4c29c1cd5ce364c91577c7cea 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>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 6 +
.../dts/overlays/rpi-cirrus-wm5102-overlay.dts | 146 +++
sound/soc/bcm/Kconfig | 9 +
sound/soc/bcm/Makefile | 2 +
sound/soc/bcm/rpi-cirrus.c | 1003 ++++++++++++++++++++
6 files changed, 1167 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/rpi-cirrus-wm5102-overlay.dts
create mode 100644 sound/soc/bcm/rpi-cirrus.c
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -68,6 +68,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
qca7000.dtbo \
raspidac3.dtbo \
rpi-backlight.dtbo \
+ rpi-cirrus-wm5102.dtbo \
rpi-dac.dtbo \
rpi-display.dtbo \
rpi-ft5406.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -995,6 +995,12 @@ Load: dtoverlay=rpi-backlight
Params: <None>
+Name: rpi-cirrus-wm5102
+Info: Configures the Cirrus Logic Audio Card
+Load: dtoverlay=rpi-cirrus-wm5102
+Params: <None>
+
+
Name: rpi-dac
Info: Configures the RPi DAC audio card
Load: dtoverlay=rpi-dac
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/rpi-cirrus-wm5102-overlay.dts
@@ -0,0 +1,146 @@
+// Definitions for the Cirrus Logic Audio Card
+/dts-v1/;
+/plugin/;
+#include <dt-bindings/pinctrl/bcm2835.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/mfd/arizona.h>
+
+/ {
+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+ fragment@0 {
+ target = <&i2s>;
+ __overlay__ {
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ wlf_pins: wlf_pins {
+ brcm,pins = <17 22 27 8>;
+ brcm,function = <
+ BCM2835_FSEL_GPIO_OUT
+ BCM2835_FSEL_GPIO_OUT
+ BCM2835_FSEL_GPIO_IN
+ BCM2835_FSEL_GPIO_OUT
+ >;
+ };
+ };
+ };
+
+ fragment@2 {
+ target-path = "/";
+ __overlay__ {
+ rpi_cirrus_reg_1v8: rpi_cirrus_reg_1v8 {
+ compatible = "regulator-fixed";
+ regulator-name = "RPi-Cirrus 1v8";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-always-on;
+ };
+ };
+ };
+
+ fragment@3 {
+ target = <&spi0>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ spidev@0{
+ status = "disabled";
+ };
+
+ spidev@1{
+ status = "disabled";
+ };
+
+ wm5102@1{
+ compatible = "wlf,wm5102";
+ reg = <1>;
+
+ spi-max-frequency = <500000>;
+
+ interrupt-parent = <&gpio>;
+ interrupts = <27 8>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ LDOVDD-supply = <&rpi_cirrus_reg_1v8>;
+ AVDD-supply = <&rpi_cirrus_reg_1v8>;
+ DBVDD1-supply = <&rpi_cirrus_reg_1v8>;
+ DBVDD2-supply = <&vdd_3v3_reg>;
+ DBVDD3-supply = <&vdd_3v3_reg>;
+ CPVDD-supply = <&rpi_cirrus_reg_1v8>;
+ SPKVDDL-supply = <&vdd_5v0_reg>;
+ SPKVDDR-supply = <&vdd_5v0_reg>;
+ DCVDD-supply = <&arizona_ldo1>;
+
+ wlf,reset = <&gpio 17 GPIO_ACTIVE_HIGH>;
+ wlf,ldoena = <&gpio 22 GPIO_ACTIVE_HIGH>;
+ wlf,gpio-defaults = <
+ ARIZONA_GP_DEFAULT
+ ARIZONA_GP_DEFAULT
+ ARIZONA_GP_DEFAULT
+ ARIZONA_GP_DEFAULT
+ ARIZONA_GP_DEFAULT
+ >;
+ wlf,micd-configs = <0 1 0>;
+ wlf,dmic-ref = <
+ ARIZONA_DMIC_MICVDD
+ ARIZONA_DMIC_MICBIAS2
+ ARIZONA_DMIC_MICVDD
+ ARIZONA_DMIC_MICVDD
+ >;
+ wlf,inmode = <
+ ARIZONA_INMODE_DIFF
+ ARIZONA_INMODE_DMIC
+ ARIZONA_INMODE_SE
+ ARIZONA_INMODE_DIFF
+ >;
+ status = "okay";
+
+ arizona_ldo1: ldo1 {
+ regulator-name = "LDO1";
+ // default constraints as in
+ // arizona-ldo1.c
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1800000>;
+ };
+ };
+ };
+ };
+
+ fragment@4 {
+ target = <&i2c1>;
+ __overlay__ {
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ wm8804@3b {
+ compatible = "wlf,wm8804";
+ reg = <0x3b>;
+ status = "okay";
+ PVDD-supply = <&vdd_3v3_reg>;
+ DVDD-supply = <&vdd_3v3_reg>;
+ wlf,reset-gpio = <&gpio 8 GPIO_ACTIVE_HIGH>;
+ };
+ };
+ };
+
+ fragment@5 {
+ target = <&sound>;
+ __overlay__ {
+ compatible = "wlf,rpi-cirrus";
+ i2s-controller = <&i2s>;
+ status = "okay";
+ };
+ };
+};
--- a/sound/soc/bcm/Kconfig
+++ b/sound/soc/bcm/Kconfig
@@ -45,6 +45,15 @@ config SND_BCM2708_SOC_HIFIBERRY_AMP
help
Say Y or M if you want to add support for the HifiBerry Amp amplifier board.
+config SND_BCM2708_SOC_RPI_CIRRUS
+ tristate "Support for Cirrus Logic Audio Card"
+ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+ select SND_SOC_WM5102
+ select SND_SOC_WM8804
+ help
+ Say Y or M if you want to add support for the Wolfson and
+ Cirrus Logic audio cards.
+
config SND_BCM2708_SOC_RPI_DAC
tristate "Support for RPi-DAC"
depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
--- a/sound/soc/bcm/Makefile
+++ b/sound/soc/bcm/Makefile
@@ -16,6 +16,7 @@ snd-soc-hifiberry-dacplus-objs := hifibe
snd-soc-hifiberry-digi-objs := hifiberry_digi.o
snd-soc-justboom-dac-objs := justboom-dac.o
snd-soc-justboom-digi-objs := justboom-digi.o
+snd-soc-rpi-cirrus-objs := rpi-cirrus.o
snd-soc-rpi-dac-objs := rpi-dac.o
snd-soc-rpi-proto-objs := rpi-proto.o
snd-soc-iqaudio-dac-objs := iqaudio-dac.o
@@ -34,6 +35,7 @@ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_D
obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
obj-$(CONFIG_SND_BCM2708_SOC_JUSTBOOM_DAC) += snd-soc-justboom-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_JUSTBOOM_DIGI) += snd-soc-justboom-digi.o
+obj-$(CONFIG_SND_BCM2708_SOC_RPI_CIRRUS) += snd-soc-rpi-cirrus.o
obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO) += snd-soc-rpi-proto.o
obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
--- /dev/null
+++ b/sound/soc/bcm/rpi-cirrus.c
@@ -0,0 +1,1003 @@
+/*
+ * 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_codec *wm8804_codec = get_wm8804_runtime(card)->codec;
+ 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_update_bits(wm8804_codec,
+ 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_codec *wm8804_codec = get_wm8804_runtime(card)->codec;
+ unsigned int mask;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ mask = (i == 3) ? 0x3f : 0xff;
+ ucontrol->value.iec958.status[i] =
+ snd_soc_read(wm8804_codec, WM8804_RXCHAN1 + i) & 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_codec *wm8804_codec = get_wm8804_runtime(card)->codec;
+
+ unsigned int bit = kcontrol->private_value & 0xff;
+ unsigned int reg = (kcontrol->private_value >> 8) & 0xff;
+ unsigned int invert = (kcontrol->private_value >> 16) & 0xff;
+
+ bool flag = snd_soc_read(wm8804_codec, reg) & (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_codec *wm8804_codec = get_wm8804_runtime(card)->codec;
+
+ ucontrol->value.enumerated.item[0] =
+ (snd_soc_read(wm8804_codec, WM8804_SPDSTAT) >> 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_codec *wm5102_codec) {
+
+ int ret1, ret2;
+
+ ret1 = snd_soc_codec_set_pll(wm5102_codec,
+ WM5102_FLL1, ARIZONA_FLL_SRC_NONE, 0, 0);
+ ret2 = snd_soc_codec_set_pll(wm5102_codec,
+ 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_codec *wm5102_codec, unsigned int clk_freq)
+{
+ int ret = snd_soc_codec_set_pll(wm5102_codec,
+ 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_codec *wm5102_codec,
+ unsigned int clk_freq, unsigned int aif2_freq)
+{
+ int ret = snd_soc_codec_set_pll(wm5102_codec,
+ 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_codec_set_pll(wm5102_codec,
+ 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_codec *wm5102_codec = get_wm5102_runtime(card)->codec;
+
+ 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_codec);
+ if (ret) {
+ dev_err(card->dev, "spdif_rx: failed to clear FLLs\n");
+ goto out;
+ }
+
+ ret = rpi_cirrus_set_fll_refclk(card, wm5102_codec,
+ 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_codec *wm5102_codec = wm5102_runtime->codec;
+
+ 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_codec, 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_codec *wm5102_codec = wm5102_runtime->codec;
+
+ 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_codec))
+ 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_codec *wm5102_codec = rtd->codec;
+ 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_codec_set_sysclk(wm5102_codec,
+ 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_codec)) {
+ dev_err(card->dev, "hw_params: failed to clear FLLs\n");
+ goto out;
+ }
+
+ if (rpi_cirrus_set_fll(card, wm5102_codec, 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_codec *wm5102_codec = rtd->codec;
+ 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_codec_set_sysclk(wm5102_codec,
+ 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_codec *codec = rtd->codec;
+ int ret;
+
+ /* no 32kHz input, derive it from sysclk if needed */
+ snd_soc_update_bits(codec,
+ ARIZONA_CLOCK_32K_1, ARIZONA_CLK_32K_SRC_MASK, 2);
+
+ if (rpi_cirrus_clear_flls(rtd->card, codec))
+ dev_warn(rtd->card->dev,
+ "init_wm5102: failed to clear FLLs\n");
+
+ ret = snd_soc_codec_set_sysclk(codec,
+ 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_codec *codec = rtd->codec;
+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
+ struct snd_soc_card *card = rtd->card;
+ struct rpi_cirrus_priv *priv = snd_soc_card_get_drvdata(card);
+ unsigned int mask;
+ int i, ret;
+
+ for (i = 0; i < 4; i++) {
+ mask = (i == 3) ? 0x3f : 0xff;
+ priv->iec958_status[i] =
+ snd_soc_read(codec, WM8804_SPDTX1 + i) & 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");
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