3 files changed, 559 insertions, 0 deletions

diff --git a/sound/soc/sunxi/Kconfig b/sound/soc/sunxi/Kconfig
index 84c72ec6ad73..ae42294ef688 100644
--- a/sound/soc/sunxi/Kconfig
+++ b/sound/soc/sunxi/Kconfig
@@ -8,4 +8,12 @@ config SND_SUN4I_CODEC
 	  Select Y or M to add support for the Codec embedded in the Allwinner
 	  A10 and affiliated SoCs.
 
+config SND_SUN4I_SPDIF
+	tristate "Allwinner A10 SPDIF Support"
+	depends on OF
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	select REGMAP_MMIO
+	help
+	  Say Y or M to add support for the S/PDIF audio block in the Allwinner
+	  A10 and affiliated SoCs.
 endmenu
diff --git a/sound/soc/sunxi/Makefile b/sound/soc/sunxi/Makefile
index ea8a08c881d6..8f5e889667f1 100644
--- a/sound/soc/sunxi/Makefile
+++ b/sound/soc/sunxi/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_SND_SUN4I_CODEC) += sun4i-codec.o
 
+obj-$(CONFIG_SND_SUN4I_SPDIF) += sun4i-spdif.o
diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
new file mode 100644
index 000000000000..0b04fb02125c
--- /dev/null
+++ b/sound/soc/sunxi/sun4i-spdif.c
@@ -0,0 +1,550 @@
+/*
+ * ALSA SoC SPDIF Audio Layer
+ *
+ * Copyright 2015 Andrea Venturi <be17068@iperbole.bo.it>
+ * Copyright 2015 Marcus Cooper <codekipper@gmail.com>
+ *
+ * Based on the Allwinner SDK driver, released under the GPL.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/regmap.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#define	SUN4I_SPDIF_CTL		(0x00)
+	#define SUN4I_SPDIF_CTL_MCLKDIV(v)		((v) << 4) /* v even */
+	#define SUN4I_SPDIF_CTL_MCLKOUTEN		BIT(2)
+	#define SUN4I_SPDIF_CTL_GEN			BIT(1)
+	#define SUN4I_SPDIF_CTL_RESET			BIT(0)
+
+#define SUN4I_SPDIF_TXCFG	(0x04)
+	#define SUN4I_SPDIF_TXCFG_SINGLEMOD		BIT(31)
+	#define SUN4I_SPDIF_TXCFG_ASS			BIT(17)
+	#define SUN4I_SPDIF_TXCFG_NONAUDIO		BIT(16)
+	#define SUN4I_SPDIF_TXCFG_TXRATIO(v)		((v) << 4)
+	#define SUN4I_SPDIF_TXCFG_TXRATIO_MASK		GENMASK(8, 4)
+	#define SUN4I_SPDIF_TXCFG_FMTRVD		GENMASK(3, 2)
+	#define SUN4I_SPDIF_TXCFG_FMT16BIT		(0 << 2)
+	#define SUN4I_SPDIF_TXCFG_FMT20BIT		(1 << 2)
+	#define SUN4I_SPDIF_TXCFG_FMT24BIT		(2 << 2)
+	#define SUN4I_SPDIF_TXCFG_CHSTMODE		BIT(1)
+	#define SUN4I_SPDIF_TXCFG_TXEN			BIT(0)
+
+#define SUN4I_SPDIF_RXCFG	(0x08)
+	#define SUN4I_SPDIF_RXCFG_LOCKFLAG		BIT(4)
+	#define SUN4I_SPDIF_RXCFG_CHSTSRC		BIT(3)
+	#define SUN4I_SPDIF_RXCFG_CHSTCP		BIT(1)
+	#define SUN4I_SPDIF_RXCFG_RXEN			BIT(0)
+
+#define SUN4I_SPDIF_TXFIFO	(0x0C)
+
+#define SUN4I_SPDIF_RXFIFO	(0x10)
+
+#define SUN4I_SPDIF_FCTL	(0x14)
+	#define SUN4I_SPDIF_FCTL_FIFOSRC		BIT(31)
+	#define SUN4I_SPDIF_FCTL_FTX			BIT(17)
+	#define SUN4I_SPDIF_FCTL_FRX			BIT(16)
+	#define SUN4I_SPDIF_FCTL_TXTL(v)		((v) << 8)
+	#define SUN4I_SPDIF_FCTL_TXTL_MASK		GENMASK(12, 8)
+	#define SUN4I_SPDIF_FCTL_RXTL(v)		((v) << 3)
+	#define SUN4I_SPDIF_FCTL_RXTL_MASK		GENMASK(7, 3)
+	#define SUN4I_SPDIF_FCTL_TXIM			BIT(2)
+	#define SUN4I_SPDIF_FCTL_RXOM(v)		((v) << 0)
+	#define SUN4I_SPDIF_FCTL_RXOM_MASK		GENMASK(1, 0)
+
+#define SUN4I_SPDIF_FSTA	(0x18)
+	#define SUN4I_SPDIF_FSTA_TXE			BIT(14)
+	#define SUN4I_SPDIF_FSTA_TXECNTSHT		(8)
+	#define SUN4I_SPDIF_FSTA_RXA			BIT(6)
+	#define SUN4I_SPDIF_FSTA_RXACNTSHT		(0)
+
+#define SUN4I_SPDIF_INT		(0x1C)
+	#define SUN4I_SPDIF_INT_RXLOCKEN		BIT(18)
+	#define SUN4I_SPDIF_INT_RXUNLOCKEN		BIT(17)
+	#define SUN4I_SPDIF_INT_RXPARERREN		BIT(16)
+	#define SUN4I_SPDIF_INT_TXDRQEN			BIT(7)
+	#define SUN4I_SPDIF_INT_TXUIEN			BIT(6)
+	#define SUN4I_SPDIF_INT_TXOIEN			BIT(5)
+	#define SUN4I_SPDIF_INT_TXEIEN			BIT(4)
+	#define SUN4I_SPDIF_INT_RXDRQEN			BIT(2)
+	#define SUN4I_SPDIF_INT_RXOIEN			BIT(1)
+	#define SUN4I_SPDIF_INT_RXAIEN			BIT(0)
+
+#define SUN4I_SPDIF_ISTA	(0x20)
+	#define SUN4I_SPDIF_ISTA_RXLOCKSTA		BIT(18)
+	#define SUN4I_SPDIF_ISTA_RXUNLOCKSTA		BIT(17)
+	#define SUN4I_SPDIF_ISTA_RXPARERRSTA		BIT(16)
+	#define SUN4I_SPDIF_ISTA_TXUSTA			BIT(6)
+	#define SUN4I_SPDIF_ISTA_TXOSTA			BIT(5)
+	#define SUN4I_SPDIF_ISTA_TXESTA			BIT(4)
+	#define SUN4I_SPDIF_ISTA_RXOSTA			BIT(1)
+	#define SUN4I_SPDIF_ISTA_RXASTA			BIT(0)
+
+#define SUN4I_SPDIF_TXCNT	(0x24)
+
+#define SUN4I_SPDIF_RXCNT	(0x28)
+
+#define SUN4I_SPDIF_TXCHSTA0	(0x2C)
+	#define SUN4I_SPDIF_TXCHSTA0_CLK(v)		((v) << 28)
+	#define SUN4I_SPDIF_TXCHSTA0_SAMFREQ(v)		((v) << 24)
+	#define SUN4I_SPDIF_TXCHSTA0_SAMFREQ_MASK	GENMASK(27, 24)
+	#define SUN4I_SPDIF_TXCHSTA0_CHNUM(v)		((v) << 20)
+	#define SUN4I_SPDIF_TXCHSTA0_CHNUM_MASK		GENMASK(23, 20)
+	#define SUN4I_SPDIF_TXCHSTA0_SRCNUM(v)		((v) << 16)
+	#define SUN4I_SPDIF_TXCHSTA0_CATACOD(v)		((v) << 8)
+	#define SUN4I_SPDIF_TXCHSTA0_MODE(v)		((v) << 6)
+	#define SUN4I_SPDIF_TXCHSTA0_EMPHASIS(v)	((v) << 3)
+	#define SUN4I_SPDIF_TXCHSTA0_CP			BIT(2)
+	#define SUN4I_SPDIF_TXCHSTA0_AUDIO		BIT(1)
+	#define SUN4I_SPDIF_TXCHSTA0_PRO		BIT(0)
+
+#define SUN4I_SPDIF_TXCHSTA1	(0x30)
+	#define SUN4I_SPDIF_TXCHSTA1_CGMSA(v)		((v) << 8)
+	#define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ(v)	((v) << 4)
+	#define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ_MASK	GENMASK(7, 4)
+	#define SUN4I_SPDIF_TXCHSTA1_SAMWORDLEN(v)	((v) << 1)
+	#define SUN4I_SPDIF_TXCHSTA1_MAXWORDLEN		BIT(0)
+
+#define SUN4I_SPDIF_RXCHSTA0	(0x34)
+	#define SUN4I_SPDIF_RXCHSTA0_CLK(v)		((v) << 28)
+	#define SUN4I_SPDIF_RXCHSTA0_SAMFREQ(v)		((v) << 24)
+	#define SUN4I_SPDIF_RXCHSTA0_CHNUM(v)		((v) << 20)
+	#define SUN4I_SPDIF_RXCHSTA0_SRCNUM(v)		((v) << 16)
+	#define SUN4I_SPDIF_RXCHSTA0_CATACOD(v)		((v) << 8)
+	#define SUN4I_SPDIF_RXCHSTA0_MODE(v)		((v) << 6)
+	#define SUN4I_SPDIF_RXCHSTA0_EMPHASIS(v)	((v) << 3)
+	#define SUN4I_SPDIF_RXCHSTA0_CP			BIT(2)
+	#define SUN4I_SPDIF_RXCHSTA0_AUDIO		BIT(1)
+	#define SUN4I_SPDIF_RXCHSTA0_PRO		BIT(0)
+
+#define SUN4I_SPDIF_RXCHSTA1	(0x38)
+	#define SUN4I_SPDIF_RXCHSTA1_CGMSA(v)		((v) << 8)
+	#define SUN4I_SPDIF_RXCHSTA1_ORISAMFREQ(v)	((v) << 4)
+	#define SUN4I_SPDIF_RXCHSTA1_SAMWORDLEN(v)	((v) << 1)
+	#define SUN4I_SPDIF_RXCHSTA1_MAXWORDLEN		BIT(0)
+
+/* Defines for Sampling Frequency */
+#define SUN4I_SPDIF_SAMFREQ_44_1KHZ		0x0
+#define SUN4I_SPDIF_SAMFREQ_NOT_INDICATED	0x1
+#define SUN4I_SPDIF_SAMFREQ_48KHZ		0x2
+#define SUN4I_SPDIF_SAMFREQ_32KHZ		0x3
+#define SUN4I_SPDIF_SAMFREQ_22_05KHZ		0x4
+#define SUN4I_SPDIF_SAMFREQ_24KHZ		0x6
+#define SUN4I_SPDIF_SAMFREQ_88_2KHZ		0x8
+#define SUN4I_SPDIF_SAMFREQ_76_8KHZ		0x9
+#define SUN4I_SPDIF_SAMFREQ_96KHZ		0xa
+#define SUN4I_SPDIF_SAMFREQ_176_4KHZ		0xc
+#define SUN4I_SPDIF_SAMFREQ_192KHZ		0xe
+
+struct sun4i_spdif_dev {
+	struct platform_device *pdev;
+	struct clk *spdif_clk;
+	struct clk *apb_clk;
+	struct snd_soc_dai_driver cpu_dai_drv;
+	struct regmap *regmap;
+	struct snd_dmaengine_dai_dma_data dma_params_tx;
+};
+
+static void sun4i_spdif_configure(struct sun4i_spdif_dev *host)
+{
+	/* soft reset SPDIF */
+	regmap_write(host->regmap, SUN4I_SPDIF_CTL, SUN4I_SPDIF_CTL_RESET);
+
+	/* flush TX FIFO */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
+			   SUN4I_SPDIF_FCTL_FTX, SUN4I_SPDIF_FCTL_FTX);
+
+	/* clear TX counter */
+	regmap_write(host->regmap, SUN4I_SPDIF_TXCNT, 0);
+}
+
+static void sun4i_snd_txctrl_on(struct snd_pcm_substream *substream,
+				struct sun4i_spdif_dev *host)
+{
+	if (substream->runtime->channels == 1)
+		regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
+				   SUN4I_SPDIF_TXCFG_SINGLEMOD,
+				   SUN4I_SPDIF_TXCFG_SINGLEMOD);
+
+	/* SPDIF TX ENABLE */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
+			   SUN4I_SPDIF_TXCFG_TXEN, SUN4I_SPDIF_TXCFG_TXEN);
+
+	/* DRQ ENABLE */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_INT,
+			   SUN4I_SPDIF_INT_TXDRQEN, SUN4I_SPDIF_INT_TXDRQEN);
+
+	/* Global enable */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_CTL,
+			   SUN4I_SPDIF_CTL_GEN, SUN4I_SPDIF_CTL_GEN);
+}
+
+static void sun4i_snd_txctrl_off(struct snd_pcm_substream *substream,
+				 struct sun4i_spdif_dev *host)
+{
+	/* SPDIF TX DISABLE */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
+			   SUN4I_SPDIF_TXCFG_TXEN, 0);
+
+	/* DRQ DISABLE */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_INT,
+			   SUN4I_SPDIF_INT_TXDRQEN, 0);
+
+	/* Global disable */
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_CTL,
+			   SUN4I_SPDIF_CTL_GEN, 0);
+}
+
+static int sun4i_spdif_startup(struct snd_pcm_substream *substream,
+			       struct snd_soc_dai *cpu_dai)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return -EINVAL;
+
+	sun4i_spdif_configure(host);
+
+	return 0;
+}
+
+static int sun4i_spdif_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params,
+				 struct snd_soc_dai *cpu_dai)
+{
+	int ret = 0;
+	int fmt;
+	unsigned long rate = params_rate(params);
+	u32 mclk_div = 0;
+	unsigned int mclk = 0;
+	u32 reg_val;
+	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+	struct platform_device *pdev = host->pdev;
+
+	/* Add the PCM and raw data select interface */
+	switch (params_channels(params)) {
+	case 1: /* PCM mode */
+	case 2:
+		fmt = 0;
+		break;
+	case 4: /* raw data mode */
+		fmt = SUN4I_SPDIF_TXCFG_NONAUDIO;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		fmt |= SUN4I_SPDIF_TXCFG_FMT16BIT;
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		fmt |= SUN4I_SPDIF_TXCFG_FMT20BIT;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		fmt |= SUN4I_SPDIF_TXCFG_FMT24BIT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (rate) {
+	case 22050:
+	case 44100:
+	case 88200:
+	case 176400:
+		mclk = 22579200;
+		break;
+	case 24000:
+	case 32000:
+	case 48000:
+	case 96000:
+	case 192000:
+		mclk = 24576000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = clk_set_rate(host->spdif_clk, mclk);
+	if (ret < 0) {
+		dev_err(&pdev->dev,
+			"Setting SPDIF clock rate for %d Hz failed!\n", mclk);
+		return ret;
+	}
+
+	regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
+			   SUN4I_SPDIF_FCTL_TXIM, SUN4I_SPDIF_FCTL_TXIM);
+
+	switch (rate) {
+	case 22050:
+	case 24000:
+		mclk_div = 8;
+		break;
+	case 32000:
+		mclk_div = 6;
+		break;
+	case 44100:
+	case 48000:
+		mclk_div = 4;
+		break;
+	case 88200:
+	case 96000:
+		mclk_div = 2;
+		break;
+	case 176400:
+	case 192000:
+		mclk_div = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	reg_val = 0;
+	reg_val |= SUN4I_SPDIF_TXCFG_ASS;
+	reg_val |= fmt; /* set non audio and bit depth */
+	reg_val |= SUN4I_SPDIF_TXCFG_CHSTMODE;
+	reg_val |= SUN4I_SPDIF_TXCFG_TXRATIO(mclk_div - 1);
+	regmap_write(host->regmap, SUN4I_SPDIF_TXCFG, reg_val);
+
+	return 0;
+}
+
+static int sun4i_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+			       struct snd_soc_dai *dai)
+{
+	int ret = 0;
+	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return -EINVAL;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		sun4i_snd_txctrl_on(substream, host);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		sun4i_snd_txctrl_off(substream, host);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int sun4i_spdif_soc_dai_probe(struct snd_soc_dai *dai)
+{
+	struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
+
+	snd_soc_dai_init_dma_data(dai, &host->dma_params_tx, NULL);
+	return 0;
+}
+
+static const struct snd_soc_dai_ops sun4i_spdif_dai_ops = {
+	.startup	= sun4i_spdif_startup,
+	.trigger	= sun4i_spdif_trigger,
+	.hw_params	= sun4i_spdif_hw_params,
+};
+
+static const struct regmap_config sun4i_spdif_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = SUN4I_SPDIF_RXCHSTA1,
+};
+
+#define SUN4I_RATES	SNDRV_PCM_RATE_8000_192000
+
+#define SUN4I_FORMATS	(SNDRV_PCM_FORMAT_S16_LE | \
+				SNDRV_PCM_FORMAT_S20_3LE | \
+				SNDRV_PCM_FORMAT_S24_LE)
+
+static struct snd_soc_dai_driver sun4i_spdif_dai = {
+	.playback = {
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = SUN4I_RATES,
+		.formats = SUN4I_FORMATS,
+	},
+	.probe = sun4i_spdif_soc_dai_probe,
+	.ops = &sun4i_spdif_dai_ops,
+	.name = "spdif",
+};
+
+static const struct snd_soc_dapm_widget dit_widgets[] = {
+	SND_SOC_DAPM_OUTPUT("spdif-out"),
+};
+
+static const struct snd_soc_dapm_route dit_routes[] = {
+	{ "spdif-out", NULL, "Playback" },
+};
+
+static const struct of_device_id sun4i_spdif_of_match[] = {
+	{ .compatible = "allwinner,sun4i-a10-spdif", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
+
+static const struct snd_soc_component_driver sun4i_spdif_component = {
+	.name		= "sun4i-spdif",
+};
+
+static int sun4i_spdif_runtime_suspend(struct device *dev)
+{
+	struct sun4i_spdif_dev *host  = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(host->spdif_clk);
+	clk_disable_unprepare(host->apb_clk);
+
+	return 0;
+}
+
+static int sun4i_spdif_runtime_resume(struct device *dev)
+{
+	struct sun4i_spdif_dev *host  = dev_get_drvdata(dev);
+
+	clk_prepare_enable(host->spdif_clk);
+	clk_prepare_enable(host->apb_clk);
+
+	return 0;
+}
+
+static int sun4i_spdif_probe(struct platform_device *pdev)
+{
+	struct sun4i_spdif_dev *host;
+	struct resource *res;
+	int ret;
+	void __iomem *base;
+
+	dev_dbg(&pdev->dev, "Entered %s\n", __func__);
+
+	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+	if (!host)
+		return -ENOMEM;
+
+	host->pdev = pdev;
+
+	/* Initialize this copy of the CPU DAI driver structure */
+	memcpy(&host->cpu_dai_drv, &sun4i_spdif_dai, sizeof(sun4i_spdif_dai));
+	host->cpu_dai_drv.name = dev_name(&pdev->dev);
+
+	/* Get the addresses */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	host->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+						&sun4i_spdif_regmap_config);
+
+	/* Clocks */
+	host->apb_clk = devm_clk_get(&pdev->dev, "apb");
+	if (IS_ERR(host->apb_clk)) {
+		dev_err(&pdev->dev, "failed to get a apb clock.\n");
+		return PTR_ERR(host->apb_clk);
+	}
+
+	host->spdif_clk = devm_clk_get(&pdev->dev, "spdif");
+	if (IS_ERR(host->spdif_clk)) {
+		dev_err(&pdev->dev, "failed to get a spdif clock.\n");
+		ret = PTR_ERR(host->spdif_clk);
+		goto err_disable_apb_clk;
+	}
+
+	host->dma_params_tx.addr = res->start + SUN4I_SPDIF_TXFIFO;
+	host->dma_params_tx.maxburst = 4;
+	host->dma_params_tx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+
+	platform_set_drvdata(pdev, host);
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+				&sun4i_spdif_component, &sun4i_spdif_dai, 1);
+	if (ret)
+		goto err_disable_apb_clk;
+
+	pm_runtime_enable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev)) {
+		ret = sun4i_spdif_runtime_resume(&pdev->dev);
+		if (ret)
+			goto err_unregister;
+	}
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret)
+		goto err_suspend;
+	return 0;
+err_suspend:
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		sun4i_spdif_runtime_suspend(&pdev->dev);
+err_unregister:
+	pm_runtime_disable(&pdev->dev);
+	snd_soc_unregister_component(&pdev->dev);
+err_disable_apb_clk:
+	clk_disable_unprepare(host->apb_clk);
+	return ret;
+}
+
+static int sun4i_spdif_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		sun4i_spdif_runtime_suspend(&pdev->dev);
+
+	snd_soc_unregister_platform(&pdev->dev);
+	snd_soc_unregister_component(&pdev->dev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops sun4i_spdif_pm = {
+	SET_RUNTIME_PM_OPS(sun4i_spdif_runtime_suspend,
+			   sun4i_spdif_runtime_resume, NULL)
+};
+
+static struct platform_driver sun4i_spdif_driver = {
+	.driver		= {
+		.name	= "sun4i-spdif",
+		.of_match_table = of_match_ptr(sun4i_spdif_of_match),
+		.pm	= &sun4i_spdif_pm,
+	},
+	.probe		= sun4i_spdif_probe,
+	.remove		= sun4i_spdif_remove,
+};
+
+module_platform_driver(sun4i_spdif_driver);
+
+MODULE_AUTHOR("Marcus Cooper <codekipper@gmail.com>");
+MODULE_AUTHOR("Andrea Venturi <be17068@iperbole.bo.it>");
+MODULE_DESCRIPTION("Allwinner sun4i SPDIF SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sun4i-spdif");