ASoC: WM8804: Initial driver

The WM8804 is a high performance consumer mode S/PDIF transceiver with
support for 1 received channel and 1 transmitted channel.

Signed-off-by: Dimitris Papastamos <[e-mail]>
Acked-by: Liam Girdwood <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/Kconfig

···
 	select SND_SOC_WM8750 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8753 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8776 if SND_SOC_I2C_AND_SPI
+	select SND_SOC_WM8804 if SND_SOC_I2C_AND_SPI
 	select SND_SOC_WM8900 if I2C
 	select SND_SOC_WM8903 if I2C
 	select SND_SOC_WM8904 if I2C
···
 	tristate
 
 config SND_SOC_WM8776
+	tristate
+
+config SND_SOC_WM8804
 	tristate
 
 config SND_SOC_WM8900

sound/soc/codecs/Makefile

···
 snd-soc-wm8750-objs := wm8750.o
 snd-soc-wm8753-objs := wm8753.o
 snd-soc-wm8776-objs := wm8776.o
+snd-soc-wm8804-objs := wm8804.o
 snd-soc-wm8900-objs := wm8900.o
 snd-soc-wm8903-objs := wm8903.o
 snd-soc-wm8904-objs := wm8904.o
···
 obj-$(CONFIG_SND_SOC_WM8750)	+= snd-soc-wm8750.o
 obj-$(CONFIG_SND_SOC_WM8753)	+= snd-soc-wm8753.o
 obj-$(CONFIG_SND_SOC_WM8776)	+= snd-soc-wm8776.o
+obj-$(CONFIG_SND_SOC_WM8804)	+= snd-soc-wm8804.o
 obj-$(CONFIG_SND_SOC_WM8900)	+= snd-soc-wm8900.o
 obj-$(CONFIG_SND_SOC_WM8903)	+= snd-soc-wm8903.o
 obj-$(CONFIG_SND_SOC_WM8904)	+= snd-soc-wm8904.o

sound/soc/codecs/wm8804.c

···
+/*
+ * wm8804.c  --  WM8804 S/PDIF transceiver driver
+ *
+ * Copyright 2010 Wolfson Microelectronics plc
+ *
+ * Author: Dimitris Papastamos <[e-mail]>
+ *
+ * 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/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+
+#include "wm8804.h"
+
+#define WM8804_NUM_SUPPLIES 2
+static const char *wm8804_supply_names[WM8804_NUM_SUPPLIES] = {
+	"PVDD",
+	"DVDD"
+};
+
+static const u8 wm8804_reg_defs[] = {
+	0x05,     /* R0  - RST/DEVID1 */
+	0x88,     /* R1  - DEVID2 */
+	0x04,     /* R2  - DEVREV */
+	0x21,     /* R3  - PLL1 */
+	0xFD,     /* R4  - PLL2 */
+	0x36,     /* R5  - PLL3 */
+	0x07,     /* R6  - PLL4 */
+	0x16,     /* R7  - PLL5 */
+	0x18,     /* R8  - PLL6 */
+	0xFF,     /* R9  - SPDMODE */
+	0x00,     /* R10 - INTMASK */
+	0x00,     /* R11 - INTSTAT */
+	0x00,     /* R12 - SPDSTAT */
+	0x00,     /* R13 - RXCHAN1 */
+	0x00,     /* R14 - RXCHAN2 */
+	0x00,     /* R15 - RXCHAN3 */
+	0x00,     /* R16 - RXCHAN4 */
+	0x00,     /* R17 - RXCHAN5 */
+	0x00,     /* R18 - SPDTX1 */
+	0x00,     /* R19 - SPDTX2 */
+	0x00,     /* R20 - SPDTX3 */
+	0x71,     /* R21 - SPDTX4 */
+	0x0B,     /* R22 - SPDTX5 */
+	0x70,     /* R23 - GPO0 */
+	0x57,     /* R24 - GPO1 */
+	0x00,     /* R25 */
+	0x42,     /* R26 - GPO2 */
+	0x06,     /* R27 - AIFTX */
+	0x06,     /* R28 - AIFRX */
+	0x80,     /* R29 - SPDRX1 */
+	0x07,     /* R30 - PWRDN */
+};
+
+struct wm8804_priv {
+	enum snd_soc_control_type control_type;
+	struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
+	struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
+	struct snd_soc_codec *codec;
+};
+
+static int txsrc_get(struct snd_kcontrol *kcontrol,
+		     struct snd_ctl_elem_value *ucontrol);
+
+static int txsrc_put(struct snd_kcontrol *kcontrol,
+		     struct snd_ctl_elem_value *ucontrol);
+
+/*
+ * We can't use the same notifier block for more than one supply and
+ * there's no way I can see to get from a callback to the caller
+ * except container_of().
+ */
+#define WM8804_REGULATOR_EVENT(n) \
+static int wm8804_regulator_event_##n(struct notifier_block *nb, \
+				      unsigned long event, void *data)    \
+{ \
+	struct wm8804_priv *wm8804 = container_of(nb, struct wm8804_priv, \
+						  disable_nb[n]); \
+	if (event & REGULATOR_EVENT_DISABLE) { \
+		wm8804->codec->cache_sync = 1; \
+	} \
+	return 0; \
+}
+
+WM8804_REGULATOR_EVENT(0)
+WM8804_REGULATOR_EVENT(1)
+
+static const char *txsrc_text[] = { "S/PDIF RX", "AIF" };
+static const SOC_ENUM_SINGLE_EXT_DECL(txsrc, txsrc_text);
+
+static const struct snd_kcontrol_new wm8804_snd_controls[] = {
+	SOC_ENUM_EXT("Input Source", txsrc, txsrc_get, txsrc_put),
+	SOC_SINGLE("TX Playback Switch", WM8804_PWRDN, 2, 1, 1),
+	SOC_SINGLE("AIF Playback Switch", WM8804_PWRDN, 4, 1, 1)
+};
+
+static int txsrc_get(struct snd_kcontrol *kcontrol,
+		     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec;
+	unsigned int src;
+
+	codec = snd_kcontrol_chip(kcontrol);
+	src = snd_soc_read(codec, WM8804_SPDTX4);
+	if (src & 0x40)
+		ucontrol->value.integer.value[0] = 1;
+	else
+		ucontrol->value.integer.value[0] = 0;
+
+	return 0;
+}
+
+static int txsrc_put(struct snd_kcontrol *kcontrol,
+		     struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_codec *codec;
+	unsigned int src, txpwr;
+
+	codec = snd_kcontrol_chip(kcontrol);
+
+	if (ucontrol->value.integer.value[0] != 0
+			&& ucontrol->value.integer.value[0] != 1)
+		return -EINVAL;
+
+	src = snd_soc_read(codec, WM8804_SPDTX4);
+	switch ((src & 0x40) >> 6) {
+	case 0:
+		if (!ucontrol->value.integer.value[0])
+			return 0;
+		break;
+	case 1:
+		if (ucontrol->value.integer.value[1])
+			return 0;
+		break;
+	}
+
+	/* save the current power state of the transmitter */
+	txpwr = snd_soc_read(codec, WM8804_PWRDN) & 0x4;
+	/* power down the transmitter */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x4);
+	/* set the tx source */
+	snd_soc_update_bits(codec, WM8804_SPDTX4, 0x40,
+			    ucontrol->value.integer.value[0] << 6);
+
+	if (ucontrol->value.integer.value[0]) {
+		/* power down the receiver */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0x2);
+		/* power up the AIF */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x10, 0);
+	} else {
+		/* don't power down the AIF -- may be used as an output */
+		/* power up the receiver */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0);
+	}
+
+	/* restore the transmitter's configuration */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, txpwr);
+
+	return 0;
+}
+
+static int wm8804_volatile(unsigned int reg)
+{
+	switch (reg) {
+	case WM8804_RST_DEVID1:
+	case WM8804_DEVID2:
+	case WM8804_DEVREV:
+	case WM8804_INTSTAT:
+	case WM8804_SPDSTAT:
+	case WM8804_RXCHAN1:
+	case WM8804_RXCHAN2:
+	case WM8804_RXCHAN3:
+	case WM8804_RXCHAN4:
+	case WM8804_RXCHAN5:
+		return 1;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int wm8804_reset(struct snd_soc_codec *codec)
+{
+	return snd_soc_write(codec, WM8804_RST_DEVID1, 0x0);
+}
+
+static int wm8804_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	struct snd_soc_codec *codec;
+	u16 format, master, bcp, lrp;
+
+	codec = dai->codec;
+
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		format = 0x2;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		format = 0x0;
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		format = 0x1;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+	case SND_SOC_DAIFMT_DSP_B:
+		format = 0x3;
+		break;
+	default:
+		dev_err(dai->dev, "Unknown dai format\n");
+		return -EINVAL;
+	}
+
+	/* set data format */
+	snd_soc_update_bits(codec, WM8804_AIFTX, 0x3, format);
+	snd_soc_update_bits(codec, WM8804_AIFRX, 0x3, format);
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		master = 1;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		master = 0;
+		break;
+	default:
+		dev_err(dai->dev, "Unknown master/slave configuration\n");
+		return -EINVAL;
+	}
+
+	/* set master/slave mode */
+	snd_soc_update_bits(codec, WM8804_AIFRX, 0x40, master << 6);
+
+	bcp = lrp = 0;
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		bcp = lrp = 1;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		bcp = 1;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		lrp = 1;
+		break;
+	default:
+		dev_err(dai->dev, "Unknown polarity configuration\n");
+		return -EINVAL;
+	}
+
+	/* set frame inversion */
+	snd_soc_update_bits(codec, WM8804_AIFTX, 0x10 | 0x20,
+			    (bcp << 4) | (lrp << 5));
+	snd_soc_update_bits(codec, WM8804_AIFRX, 0x10 | 0x20,
+			    (bcp << 4) | (lrp << 5));
+	return 0;
+}
+
+static int wm8804_hw_params(struct snd_pcm_substream *substream,
+			    struct snd_pcm_hw_params *params,
+			    struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec;
+	u16 blen;
+
+	codec = dai->codec;
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		blen = 0x0;
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		blen = 0x1;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		blen = 0x2;
+		break;
+	default:
+		dev_err(dai->dev, "Unsupported word length: %u\n",
+			params_format(params));
+		return -EINVAL;
+	}
+
+	/* set word length */
+	snd_soc_update_bits(codec, WM8804_AIFTX, 0xc, blen << 2);
+	snd_soc_update_bits(codec, WM8804_AIFRX, 0xc, blen << 2);
+
+	return 0;
+}
+
+struct pll_div {
+	u32 prescale:1;
+	u32 mclkdiv:1;
+	u32 freqmode:2;
+	u32 n:4;
+	u32 k:22;
+};
+
+/* PLL rate to output rate divisions */
+static struct {
+	unsigned int div;
+	unsigned int freqmode;
+	unsigned int mclkdiv;
+} post_table[] = {
+	{  2,  0, 0 },
+	{  4,  0, 1 },
+	{  4,  1, 0 },
+	{  8,  1, 1 },
+	{  8,  2, 0 },
+	{ 16,  2, 1 },
+	{ 12,  3, 0 },
+	{ 24,  3, 1 }
+};
+
+#define FIXED_PLL_SIZE ((1ULL << 22) * 10)
+static int pll_factors(struct pll_div *pll_div, unsigned int target,
+		       unsigned int source)
+{
+	u64 Kpart;
+	unsigned long int K, Ndiv, Nmod, tmp;
+	int i;
+
+	/*
+	 * Scale the output frequency up; the PLL should run in the
+	 * region of 90-100MHz.
+	 */
+	for (i = 0; i < ARRAY_SIZE(post_table); i++) {
+		tmp = target * post_table[i].div;
+		if (tmp >= 90000000 && tmp <= 100000000) {
+			pll_div->freqmode = post_table[i].freqmode;
+			pll_div->mclkdiv = post_table[i].mclkdiv;
+			target *= post_table[i].div;
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(post_table)) {
+		pr_err("%s: Unable to scale output frequency: %uHz\n",
+		       __func__, target);
+		return -EINVAL;
+	}
+
+	pll_div->prescale = 0;
+	Ndiv = target / source;
+	if (Ndiv < 5) {
+		source >>= 1;
+		pll_div->prescale = 1;
+		Ndiv = target / source;
+	}
+
+	if (Ndiv < 5 || Ndiv > 13) {
+		pr_err("%s: WM8804 N value is not within the recommended range: %lu\n",
+		       __func__, Ndiv);
+		return -EINVAL;
+	}
+	pll_div->n = Ndiv;
+
+	Nmod = target % source;
+	Kpart = FIXED_PLL_SIZE * (u64)Nmod;
+
+	do_div(Kpart, source);
+
+	K = Kpart & 0xffffffff;
+	if ((K % 10) >= 5)
+		K += 5;
+	K /= 10;
+	pll_div->k = K;
+
+	return 0;
+}
+
+static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
+			  int source, unsigned int freq_in,
+			  unsigned int freq_out)
+{
+	int ret;
+	struct snd_soc_codec *codec;
+	struct pll_div pll_div = { 0 };
+
+	codec = dai->codec;
+	if (freq_in && freq_out) {
+		ret = pll_factors(&pll_div, freq_out, freq_in);
+		if (ret)
+			return ret;
+	}
+
+	/* power down the PLL before reprogramming it */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0);
+
+	if (!freq_in || !freq_out)
+		return 0;
+
+	/* set PLLN and PRESCALE */
+	snd_soc_update_bits(codec, WM8804_PLL4, 0xf | 0x10,
+			    pll_div.n | (pll_div.prescale << 4));
+	/* set mclkdiv and freqmode */
+	snd_soc_update_bits(codec, WM8804_PLL5, 0x3 | 0x8,
+			    pll_div.freqmode | (pll_div.mclkdiv << 3));
+	/* set PLLK */
+	snd_soc_write(codec, WM8804_PLL1, pll_div.k & 0xff);
+	snd_soc_write(codec, WM8804_PLL2, (pll_div.k >> 8) & 0xff);
+	snd_soc_write(codec, WM8804_PLL3, pll_div.k >> 16);
+
+	/* power up the PLL */
+	snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
+
+	return 0;
+}
+
+static int wm8804_set_sysclk(struct snd_soc_dai *dai,
+			     int clk_id, unsigned int freq, int dir)
+{
+	struct snd_soc_codec *codec;
+
+	codec = dai->codec;
+
+	switch (clk_id) {
+	case WM8804_TX_CLKSRC_MCLK:
+		if ((freq >= 10000000 && freq <= 14400000)
+				|| (freq >= 16280000 && freq <= 27000000))
+			snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0x80);
+		else {
+			dev_err(dai->dev, "OSCCLOCK is not within the "
+				"recommended range: %uHz\n", freq);
+			return -EINVAL;
+		}
+		break;
+	case WM8804_TX_CLKSRC_PLL:
+		snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0);
+		break;
+	case WM8804_CLKOUT_SRC_CLK1:
+		snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0);
+		break;
+	case WM8804_CLKOUT_SRC_OSCCLK:
+		snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0x8);
+		break;
+	default:
+		dev_err(dai->dev, "Unknown clock source: %d\n", clk_id);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int wm8804_set_clkdiv(struct snd_soc_dai *dai,
+			     int div_id, int div)
+{
+	struct snd_soc_codec *codec;
+
+	codec = dai->codec;
+	switch (div_id) {
+	case WM8804_CLKOUT_DIV:
+		snd_soc_update_bits(codec, WM8804_PLL5, 0x30,
+				    (div & 0x3) << 4);
+		break;
+	default:
+		dev_err(dai->dev, "Unknown clock divider: %d\n", div_id);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void wm8804_sync_cache(struct snd_soc_codec *codec)
+{
+	short i;
+	u8 *cache;
+
+	if (!codec->cache_sync)
+		return;
+
+	codec->cache_only = 0;
+	cache = codec->reg_cache;
+	for (i = 0; i < codec->driver->reg_cache_size; i++) {
+		if (i == WM8804_RST_DEVID1 || cache[i] == wm8804_reg_defs[i])
+			continue;
+		snd_soc_write(codec, i, cache[i]);
+	}
+	codec->cache_sync = 0;
+}
+
+static int wm8804_set_bias_level(struct snd_soc_codec *codec,
+				 enum snd_soc_bias_level level)
+{
+	int ret;
+	struct wm8804_priv *wm8804;
+
+	wm8804 = snd_soc_codec_get_drvdata(codec);
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		break;
+	case SND_SOC_BIAS_PREPARE:
+		/* power up the OSC and the PLL */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		if (codec->bias_level == SND_SOC_BIAS_OFF) {
+			ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
+						    wm8804->supplies);
+			if (ret) {
+				dev_err(codec->dev,
+					"Failed to enable supplies: %d\n",
+					ret);
+				return ret;
+			}
+			wm8804_sync_cache(codec);
+		}
+		/* power down the OSC and the PLL */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
+		break;
+	case SND_SOC_BIAS_OFF:
+		/* power down the OSC and the PLL */
+		snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
+		regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies),
+				       wm8804->supplies);
+		break;
+	}
+
+	codec->bias_level = level;
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int wm8804_suspend(struct snd_soc_codec *codec, pm_message_t state)
+{
+	wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
+	return 0;
+}
+
+static int wm8804_resume(struct snd_soc_codec *codec)
+{
+	wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+	return 0;
+}
+#else
+#define wm8804_suspend NULL
+#define wm8804_resume NULL
+#endif
+
+static int wm8804_remove(struct snd_soc_codec *codec)
+{
+	struct wm8804_priv *wm8804;
+	int i;
+
+	wm8804 = snd_soc_codec_get_drvdata(codec);
+	wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	for (i = 0; i < ARRAY_SIZE(wm8804->supplies); ++i)
+		regulator_unregister_notifier(wm8804->supplies[i].consumer,
+					      &wm8804->disable_nb[i]);
+	regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
+	return 0;
+}
+
+static int wm8804_probe(struct snd_soc_codec *codec)
+{
+	struct wm8804_priv *wm8804;
+	int i, id1, id2, ret;
+
+	wm8804 = snd_soc_codec_get_drvdata(codec);
+	wm8804->codec = codec;
+
+	codec->idle_bias_off = 1;
+
+	ret = snd_soc_codec_set_cache_io(codec, 8, 8, wm8804->control_type);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to set cache i/o: %d\n", ret);
+		return ret;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
+		wm8804->supplies[i].supply = wm8804_supply_names[i];
+
+	ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8804->supplies),
+				 wm8804->supplies);
+	if (ret) {
+		dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
+		return ret;
+	}
+
+	wm8804->disable_nb[0].notifier_call = wm8804_regulator_event_0;
+	wm8804->disable_nb[1].notifier_call = wm8804_regulator_event_1;
+
+	/* This should really be moved into the regulator core */
+	for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++) {
+		ret = regulator_register_notifier(wm8804->supplies[i].consumer,
+						  &wm8804->disable_nb[i]);
+		if (ret != 0) {
+			dev_err(codec->dev,
+				"Failed to register regulator notifier: %d\n",
+				ret);
+		}
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
+				    wm8804->supplies);
+	if (ret) {
+		dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
+		goto err_reg_get;
+	}
+
+	id1 = snd_soc_read(codec, WM8804_RST_DEVID1);
+	if (id1 < 0) {
+		dev_err(codec->dev, "Failed to read device ID: %d\n", id1);
+		ret = id1;
+		goto err_reg_enable;
+	}
+
+	id2 = snd_soc_read(codec, WM8804_DEVID2);
+	if (id2 < 0) {
+		dev_err(codec->dev, "Failed to read device ID: %d\n", id2);
+		ret = id2;
+		goto err_reg_enable;
+	}
+
+	id2 = (id2 << 8) | id1;
+
+	if (id2 != ((wm8804_reg_defs[WM8804_DEVID2] << 8)
+			| wm8804_reg_defs[WM8804_RST_DEVID1])) {
+		dev_err(codec->dev, "Invalid device ID: %#x\n", id2);
+		ret = -EINVAL;
+		goto err_reg_enable;
+	}
+
+	ret = wm8804_reset(codec);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
+		goto err_reg_enable;
+	}
+
+	wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	snd_soc_add_controls(codec, wm8804_snd_controls,
+			     ARRAY_SIZE(wm8804_snd_controls));
+	return 0;
+
+err_reg_enable:
+	regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
+err_reg_get:
+	regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
+	return ret;
+}
+
+static struct snd_soc_dai_ops wm8804_dai_ops = {
+	.hw_params = wm8804_hw_params,
+	.set_fmt = wm8804_set_fmt,
+	.set_sysclk = wm8804_set_sysclk,
+	.set_clkdiv = wm8804_set_clkdiv,
+	.set_pll = wm8804_set_pll
+};
+
+#define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+			SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_driver wm8804_dai = {
+	.name = "wm8804-s/pdif",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = WM8804_FORMATS,
+	},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_192000,
+		.formats = WM8804_FORMATS,
+	},
+	.ops = &wm8804_dai_ops,
+	.symmetric_rates = 1
+};
+
+static struct snd_soc_codec_driver soc_codec_dev_wm8804 = {
+	.probe = wm8804_probe,
+	.remove = wm8804_remove,
+	.suspend = wm8804_suspend,
+	.resume = wm8804_resume,
+	.set_bias_level = wm8804_set_bias_level,
+	.reg_cache_size = ARRAY_SIZE(wm8804_reg_defs),
+	.reg_word_size = sizeof(u8),
+	.reg_cache_default = wm8804_reg_defs,
+	.volatile_register = wm8804_volatile
+};
+
+#if defined(CONFIG_SPI_MASTER)
+static int __devinit wm8804_spi_probe(struct spi_device *spi)
+{
+	struct wm8804_priv *wm8804;
+	int ret;
+
+	wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
+	if (IS_ERR(wm8804))
+		return PTR_ERR(wm8804);
+
+	wm8804->control_type = SND_SOC_SPI;
+	spi_set_drvdata(spi, wm8804);
+
+	ret = snd_soc_register_codec(&spi->dev,
+				     &soc_codec_dev_wm8804, &wm8804_dai, 1);
+	if (ret < 0)
+		kfree(wm8804);
+	return ret;
+}
+
+static int __devexit wm8804_spi_remove(struct spi_device *spi)
+{
+	snd_soc_unregister_codec(&spi->dev);
+	kfree(spi_get_drvdata(spi));
+	return 0;
+}
+
+static struct spi_driver wm8804_spi_driver = {
+	.driver = {
+		.name = "wm8804",
+		.owner = THIS_MODULE,
+	},
+	.probe = wm8804_spi_probe,
+	.remove = __devexit_p(wm8804_spi_remove)
+};
+#endif
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+static __devinit int wm8804_i2c_probe(struct i2c_client *i2c,
+				      const struct i2c_device_id *id)
+{
+	struct wm8804_priv *wm8804;
+	int ret;
+
+	wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
+	if (IS_ERR(wm8804))
+		return PTR_ERR(wm8804);
+
+	wm8804->control_type = SND_SOC_I2C;
+	i2c_set_clientdata(i2c, wm8804);
+
+	ret = snd_soc_register_codec(&i2c->dev,
+				     &soc_codec_dev_wm8804, &wm8804_dai, 1);
+	if (ret < 0)
+		kfree(wm8804);
+	return ret;
+}
+
+static __devexit int wm8804_i2c_remove(struct i2c_client *client)
+{
+	snd_soc_unregister_codec(&client->dev);
+	kfree(i2c_get_clientdata(client));
+	return 0;
+}
+
+static const struct i2c_device_id wm8804_i2c_id[] = {
+	{ "wm8804", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, wm8804_i2c_id);
+
+static struct i2c_driver wm8804_i2c_driver = {
+	.driver = {
+		.name = "wm8804",
+		.owner = THIS_MODULE,
+	},
+	.probe = wm8804_i2c_probe,
+	.remove = __devexit_p(wm8804_i2c_remove),
+	.id_table = wm8804_i2c_id
+};
+#endif
+
+static int __init wm8804_modinit(void)
+{
+	int ret = 0;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	ret = i2c_add_driver(&wm8804_i2c_driver);
+	if (ret) {
+		printk(KERN_ERR "Failed to register wm8804 I2C driver: %d\n",
+		       ret);
+	}
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	ret = spi_register_driver(&wm8804_spi_driver);
+	if (ret != 0) {
+		printk(KERN_ERR "Failed to register wm8804 SPI driver: %d\n",
+		       ret);
+	}
+#endif
+	return ret;
+}
+module_init(wm8804_modinit);
+
+static void __exit wm8804_exit(void)
+{
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	i2c_del_driver(&wm8804_i2c_driver);
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	spi_unregister_driver(&wm8804_spi_driver);
+#endif
+}
+module_exit(wm8804_exit);
+
+MODULE_DESCRIPTION("ASoC WM8804 driver");
+MODULE_AUTHOR("Dimitris Papastamos <[e-mail]>");
+MODULE_LICENSE("GPL");

sound/soc/codecs/wm8804.h

···
+/*
+ * wm8804.h  --  WM8804 S/PDIF transceiver driver
+ *
+ * Copyright 2010 Wolfson Microelectronics plc
+ *
+ * Author: Dimitris Papastamos <[e-mail]>
+ *
+ * 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.
+ */
+
+#ifndef _WM8804_H
+#define _WM8804_H
+
+/*
+ * Register values.
+ */
+#define WM8804_RST_DEVID1			0x00
+#define WM8804_DEVID2				0x01
+#define WM8804_DEVREV				0x02
+#define WM8804_PLL1				0x03
+#define WM8804_PLL2				0x04
+#define WM8804_PLL3				0x05
+#define WM8804_PLL4				0x06
+#define WM8804_PLL5				0x07
+#define WM8804_PLL6				0x08
+#define WM8804_SPDMODE				0x09
+#define WM8804_INTMASK				0x0A
+#define WM8804_INTSTAT				0x0B
+#define WM8804_SPDSTAT				0x0C
+#define WM8804_RXCHAN1				0x0D
+#define WM8804_RXCHAN2				0x0E
+#define WM8804_RXCHAN3				0x0F
+#define WM8804_RXCHAN4				0x10
+#define WM8804_RXCHAN5				0x11
+#define WM8804_SPDTX1				0x12
+#define WM8804_SPDTX2				0x13
+#define WM8804_SPDTX3				0x14
+#define WM8804_SPDTX4				0x15
+#define WM8804_SPDTX5				0x16
+#define WM8804_GPO0				0x17
+#define WM8804_GPO1				0x18
+#define WM8804_GPO2				0x1A
+#define WM8804_AIFTX				0x1B
+#define WM8804_AIFRX				0x1C
+#define WM8804_SPDRX1				0x1D
+#define WM8804_PWRDN				0x1E
+
+#define WM8804_REGISTER_COUNT			30
+#define WM8804_MAX_REGISTER			0x1E
+
+#define WM8804_TX_CLKSRC_MCLK			1
+#define WM8804_TX_CLKSRC_PLL			2
+
+#define WM8804_CLKOUT_SRC_CLK1			3
+#define WM8804_CLKOUT_SRC_OSCCLK		4
+
+#define WM8804_CLKOUT_DIV			1
+
+#endif  /* _WM8804_H */