ASoC: Add WM8974 CODEC driver

The WM8974 is a low power, high quality mono CODEC designed for portable
applications such as digital still cameras or digital voice recorders.

This driver was originally written by Graeme Gregory and Liam Girdwood
and has since been maintained by myself with some updates contributed by
Brett Saunders and Javier Martin.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 844 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c
new file mode 100644
index 000000000000..2b0c99c3e65a
--- /dev/null
+++ b/sound/soc/codecs/wm8974.c
@@ -0,0 +1,844 @@
+/*
+ * wm8974.c  --  WM8974 ALSA Soc Audio driver
+ *
+ * Copyright 2006 Wolfson Microelectronics PLC.
+ *
+ * Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.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 "wm8974.h"
+
+#define AUDIO_NAME "wm8974"
+#define WM8974_VERSION "0.6"
+
+struct snd_soc_codec_device soc_codec_dev_wm8974;
+
+/*
+ * wm8974 register cache
+ * We can't read the WM8974 register space when we are
+ * using 2 wire for device control, so we cache them instead.
+ */
+static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
+    0x0000, 0x0000, 0x0000, 0x0000,
+    0x0050, 0x0000, 0x0140, 0x0000,
+    0x0000, 0x0000, 0x0000, 0x00ff,
+    0x0000, 0x0000, 0x0100, 0x00ff,
+    0x0000, 0x0000, 0x012c, 0x002c,
+    0x002c, 0x002c, 0x002c, 0x0000,
+    0x0032, 0x0000, 0x0000, 0x0000,
+    0x0000, 0x0000, 0x0000, 0x0000,
+    0x0038, 0x000b, 0x0032, 0x0000,
+    0x0008, 0x000c, 0x0093, 0x00e9,
+    0x0000, 0x0000, 0x0000, 0x0000,
+    0x0003, 0x0010, 0x0000, 0x0000,
+    0x0000, 0x0002, 0x0000, 0x0000,
+    0x0000, 0x0000, 0x0039, 0x0000,
+    0x0000,
+};
+
+/*
+ * read wm8974 register cache
+ */
+static inline unsigned int wm8974_read_reg_cache(struct snd_soc_codec * codec,
+	unsigned int reg)
+{
+	u16 *cache = codec->reg_cache;
+	if (reg == WM8974_RESET)
+		return 0;
+	if (reg >= WM8974_CACHEREGNUM)
+		return -1;
+	return cache[reg];
+}
+
+/*
+ * write wm8974 register cache
+ */
+static inline void wm8974_write_reg_cache(struct snd_soc_codec *codec,
+	u16 reg, unsigned int value)
+{
+	u16 *cache = codec->reg_cache;
+	if (reg >= WM8974_CACHEREGNUM)
+		return;
+	cache[reg] = value;
+}
+
+/*
+ * write to the WM8974 register space
+ */
+static int wm8974_write(struct snd_soc_codec *codec, unsigned int reg,
+	unsigned int value)
+{
+	u8 data[2];
+
+	/* data is
+	 *   D15..D9 WM8974 register offset
+	 *   D8...D0 register data
+	 */
+	data[0] = (reg << 1) | ((value >> 8) & 0x0001);
+	data[1] = value & 0x00ff;
+
+	wm8974_write_reg_cache (codec, reg, value);
+	if (codec->hw_write(codec->control_data, data, 2) == 2)
+		return 0;
+	else
+		return -EIO;
+}
+
+#define wm8974_reset(c)	wm8974_write(c, WM8974_RESET, 0)
+
+static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
+static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
+static const char *wm8974_eqmode[] = {"Capture", "Playback" };
+static const char *wm8974_bw[] = {"Narrow", "Wide" };
+static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
+static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
+static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
+static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
+static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
+static const char *wm8974_alc[] = {"ALC", "Limiter" };
+
+static const struct soc_enum wm8974_enum[] = {
+	SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
+	SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
+	SOC_ENUM_SINGLE(WM8974_DAC,  4, 4, wm8974_deemp),
+	SOC_ENUM_SINGLE(WM8974_EQ1,  8, 2, wm8974_eqmode),
+
+	SOC_ENUM_SINGLE(WM8974_EQ1,  5, 4, wm8974_eq1),
+	SOC_ENUM_SINGLE(WM8974_EQ2,  8, 2, wm8974_bw),
+	SOC_ENUM_SINGLE(WM8974_EQ2,  5, 4, wm8974_eq2),
+	SOC_ENUM_SINGLE(WM8974_EQ3,  8, 2, wm8974_bw),
+
+	SOC_ENUM_SINGLE(WM8974_EQ3,  5, 4, wm8974_eq3),
+	SOC_ENUM_SINGLE(WM8974_EQ4,  8, 2, wm8974_bw),
+	SOC_ENUM_SINGLE(WM8974_EQ4,  5, 4, wm8974_eq4),
+	SOC_ENUM_SINGLE(WM8974_EQ5,  8, 2, wm8974_bw),
+
+	SOC_ENUM_SINGLE(WM8974_EQ5,  5, 4, wm8974_eq5),
+	SOC_ENUM_SINGLE(WM8974_ALC3,  8, 2, wm8974_alc),
+};
+
+static const struct snd_kcontrol_new wm8974_snd_controls[] = {
+
+SOC_SINGLE("Digital Loopback Switch", WM8974_COMP, 0, 1, 0),
+
+SOC_ENUM("DAC Companding", wm8974_enum[1]),
+SOC_ENUM("ADC Companding", wm8974_enum[0]),
+
+SOC_ENUM("Playback De-emphasis", wm8974_enum[2]),
+SOC_SINGLE("DAC Inversion Switch", WM8974_DAC, 0, 1, 0),
+
+SOC_SINGLE("PCM Volume", WM8974_DACVOL, 0, 127, 0),
+
+SOC_SINGLE("High Pass Filter Switch", WM8974_ADC, 8, 1, 0),
+SOC_SINGLE("High Pass Cut Off", WM8974_ADC, 4, 7, 0),
+SOC_SINGLE("ADC Inversion Switch", WM8974_COMP, 0, 1, 0),
+
+SOC_SINGLE("Capture Volume", WM8974_ADCVOL,  0, 127, 0),
+
+SOC_ENUM("Equaliser Function", wm8974_enum[3]),
+SOC_ENUM("EQ1 Cut Off", wm8974_enum[4]),
+SOC_SINGLE("EQ1 Volume", WM8974_EQ1,  0, 31, 1),
+
+SOC_ENUM("Equaliser EQ2 Bandwith", wm8974_enum[5]),
+SOC_ENUM("EQ2 Cut Off", wm8974_enum[6]),
+SOC_SINGLE("EQ2 Volume", WM8974_EQ2,  0, 31, 1),
+
+SOC_ENUM("Equaliser EQ3 Bandwith", wm8974_enum[7]),
+SOC_ENUM("EQ3 Cut Off", wm8974_enum[8]),
+SOC_SINGLE("EQ3 Volume", WM8974_EQ3,  0, 31, 1),
+
+SOC_ENUM("Equaliser EQ4 Bandwith", wm8974_enum[9]),
+SOC_ENUM("EQ4 Cut Off", wm8974_enum[10]),
+SOC_SINGLE("EQ4 Volume", WM8974_EQ4,  0, 31, 1),
+
+SOC_ENUM("Equaliser EQ5 Bandwith", wm8974_enum[11]),
+SOC_ENUM("EQ5 Cut Off", wm8974_enum[12]),
+SOC_SINGLE("EQ5 Volume", WM8974_EQ5,  0, 31, 1),
+
+SOC_SINGLE("DAC Playback Limiter Switch", WM8974_DACLIM1,  8, 1, 0),
+SOC_SINGLE("DAC Playback Limiter Decay", WM8974_DACLIM1,  4, 15, 0),
+SOC_SINGLE("DAC Playback Limiter Attack", WM8974_DACLIM1,  0, 15, 0),
+
+SOC_SINGLE("DAC Playback Limiter Threshold", WM8974_DACLIM2,  4, 7, 0),
+SOC_SINGLE("DAC Playback Limiter Boost", WM8974_DACLIM2,  0, 15, 0),
+
+SOC_SINGLE("ALC Enable Switch", WM8974_ALC1,  8, 1, 0),
+SOC_SINGLE("ALC Capture Max Gain", WM8974_ALC1,  3, 7, 0),
+SOC_SINGLE("ALC Capture Min Gain", WM8974_ALC1,  0, 7, 0),
+
+SOC_SINGLE("ALC Capture ZC Switch", WM8974_ALC2,  8, 1, 0),
+SOC_SINGLE("ALC Capture Hold", WM8974_ALC2,  4, 7, 0),
+SOC_SINGLE("ALC Capture Target", WM8974_ALC2,  0, 15, 0),
+
+SOC_ENUM("ALC Capture Mode", wm8974_enum[13]),
+SOC_SINGLE("ALC Capture Decay", WM8974_ALC3,  4, 15, 0),
+SOC_SINGLE("ALC Capture Attack", WM8974_ALC3,  0, 15, 0),
+
+SOC_SINGLE("ALC Capture Noise Gate Switch", WM8974_NGATE,  3, 1, 0),
+SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8974_NGATE,  0, 7, 0),
+
+SOC_SINGLE("Capture PGA ZC Switch", WM8974_INPPGA,  7, 1, 0),
+SOC_SINGLE("Capture PGA Volume", WM8974_INPPGA,  0, 63, 0),
+
+SOC_SINGLE("Speaker Playback ZC Switch", WM8974_SPKVOL,  7, 1, 0),
+SOC_SINGLE("Speaker Playback Switch", WM8974_SPKVOL,  6, 1, 1),
+SOC_SINGLE("Speaker Playback Volume", WM8974_SPKVOL,  0, 63, 0),
+
+SOC_SINGLE("Capture Boost(+20dB)", WM8974_ADCBOOST,  8, 1, 0),
+SOC_SINGLE("Mono Playback Switch", WM8974_MONOMIX, 6, 1, 0),
+};
+
+/* add non dapm controls */
+static int wm8974_add_controls(struct snd_soc_codec *codec)
+{
+	int err, i;
+
+	for (i = 0; i < ARRAY_SIZE(wm8974_snd_controls); i++) {
+		err = snd_ctl_add(codec->card,
+				snd_soc_cnew(&wm8974_snd_controls[i],codec, NULL));
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+/* Speaker Output Mixer */
+static const struct snd_kcontrol_new wm8974_speaker_mixer_controls[] = {
+SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_SPKMIX, 1, 1, 0),
+SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_SPKMIX, 5, 1, 0),
+SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_SPKMIX, 0, 1, 1),
+};
+
+/* Mono Output Mixer */
+static const struct snd_kcontrol_new wm8974_mono_mixer_controls[] = {
+SOC_DAPM_SINGLE("Line Bypass Switch", WM8974_MONOMIX, 1, 1, 0),
+SOC_DAPM_SINGLE("Aux Playback Switch", WM8974_MONOMIX, 2, 1, 0),
+SOC_DAPM_SINGLE("PCM Playback Switch", WM8974_MONOMIX, 0, 1, 1),
+};
+
+/* AUX Input boost vol */
+static const struct snd_kcontrol_new wm8974_aux_boost_controls =
+SOC_DAPM_SINGLE("Aux Volume", WM8974_ADCBOOST, 0, 7, 0);
+
+/* Mic Input boost vol */
+static const struct snd_kcontrol_new wm8974_mic_boost_controls =
+SOC_DAPM_SINGLE("Mic Volume", WM8974_ADCBOOST, 4, 7, 0);
+
+/* Capture boost switch */
+static const struct snd_kcontrol_new wm8974_capture_boost_controls =
+SOC_DAPM_SINGLE("Capture Boost Switch", WM8974_INPPGA,  6, 1, 0);
+
+/* Aux In to PGA */
+static const struct snd_kcontrol_new wm8974_aux_capture_boost_controls =
+SOC_DAPM_SINGLE("Aux Capture Boost Switch", WM8974_INPPGA,  2, 1, 0);
+
+/* Mic P In to PGA */
+static const struct snd_kcontrol_new wm8974_micp_capture_boost_controls =
+SOC_DAPM_SINGLE("Mic P Capture Boost Switch", WM8974_INPPGA,  0, 1, 0);
+
+/* Mic N In to PGA */
+static const struct snd_kcontrol_new wm8974_micn_capture_boost_controls =
+SOC_DAPM_SINGLE("Mic N Capture Boost Switch", WM8974_INPPGA,  1, 1, 0);
+
+static const struct snd_soc_dapm_widget wm8974_dapm_widgets[] = {
+SND_SOC_DAPM_MIXER("Speaker Mixer", WM8974_POWER3, 2, 0,
+	&wm8974_speaker_mixer_controls[0],
+	ARRAY_SIZE(wm8974_speaker_mixer_controls)),
+SND_SOC_DAPM_MIXER("Mono Mixer", WM8974_POWER3, 3, 0,
+	&wm8974_mono_mixer_controls[0],
+	ARRAY_SIZE(wm8974_mono_mixer_controls)),
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8974_POWER3, 0, 0),
+SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8974_POWER3, 0, 0),
+SND_SOC_DAPM_PGA("Aux Input", WM8974_POWER1, 6, 0, NULL, 0),
+SND_SOC_DAPM_PGA("SpkN Out", WM8974_POWER3, 5, 0, NULL, 0),
+SND_SOC_DAPM_PGA("SpkP Out", WM8974_POWER3, 6, 0, NULL, 0),
+SND_SOC_DAPM_PGA("Mono Out", WM8974_POWER3, 7, 0, NULL, 0),
+SND_SOC_DAPM_PGA("Mic PGA", WM8974_POWER2, 2, 0, NULL, 0),
+
+SND_SOC_DAPM_PGA("Aux Boost", SND_SOC_NOPM, 0, 0,
+	&wm8974_aux_boost_controls, 1),
+SND_SOC_DAPM_PGA("Mic Boost", SND_SOC_NOPM, 0, 0,
+	&wm8974_mic_boost_controls, 1),
+SND_SOC_DAPM_SWITCH("Capture Boost", SND_SOC_NOPM, 0, 0,
+	&wm8974_capture_boost_controls),
+
+SND_SOC_DAPM_MIXER("Boost Mixer", WM8974_POWER2, 4, 0, NULL, 0),
+
+SND_SOC_DAPM_MICBIAS("Mic Bias", WM8974_POWER1, 4, 0),
+
+SND_SOC_DAPM_INPUT("MICN"),
+SND_SOC_DAPM_INPUT("MICP"),
+SND_SOC_DAPM_INPUT("AUX"),
+SND_SOC_DAPM_OUTPUT("MONOOUT"),
+SND_SOC_DAPM_OUTPUT("SPKOUTP"),
+SND_SOC_DAPM_OUTPUT("SPKOUTN"),
+};
+
+static const struct snd_soc_dapm_route audio_map[] = {
+	/* Mono output mixer */
+	{"Mono Mixer", "PCM Playback Switch", "DAC"},
+	{"Mono Mixer", "Aux Playback Switch", "Aux Input"},
+	{"Mono Mixer", "Line Bypass Switch", "Boost Mixer"},
+
+	/* Speaker output mixer */
+	{"Speaker Mixer", "PCM Playback Switch", "DAC"},
+	{"Speaker Mixer", "Aux Playback Switch", "Aux Input"},
+	{"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"},
+
+	/* Outputs */
+	{"Mono Out", NULL, "Mono Mixer"},
+	{"MONOOUT", NULL, "Mono Out"},
+	{"SpkN Out", NULL, "Speaker Mixer"},
+	{"SpkP Out", NULL, "Speaker Mixer"},
+	{"SPKOUTN", NULL, "SpkN Out"},
+	{"SPKOUTP", NULL, "SpkP Out"},
+
+	/* Boost Mixer */
+	{"Boost Mixer", NULL, "ADC"},
+	{"Capture Boost Switch", "Aux Capture Boost Switch", "AUX"},
+	{"Aux Boost", "Aux Volume", "Boost Mixer"},
+	{"Capture Boost", "Capture Switch", "Boost Mixer"},
+	{"Mic Boost", "Mic Volume", "Boost Mixer"},
+
+	/* Inputs */
+	{"MICP", NULL, "Mic Boost"},
+	{"MICN", NULL, "Mic PGA"},
+	{"Mic PGA", NULL, "Capture Boost"},
+	{"AUX", NULL, "Aux Input"},
+};
+
+static int wm8974_add_widgets(struct snd_soc_codec *codec)
+{
+	snd_soc_dapm_new_controls(codec, wm8974_dapm_widgets,
+				  ARRAY_SIZE(wm8974_dapm_widgets));
+
+	snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));
+
+	snd_soc_dapm_new_widgets(codec);
+	return 0;
+}
+
+struct pll_ {
+	unsigned int in_hz, out_hz;
+	unsigned int pre:4; /* prescale - 1 */
+	unsigned int n:4;
+	unsigned int k;
+};
+
+static struct pll_ pll[] = {
+	{12000000, 11289600, 0, 7, 0x86c220},
+	{12000000, 12288000, 0, 8, 0x3126e8},
+	{13000000, 11289600, 0, 6, 0xf28bd4},
+	{13000000, 12288000, 0, 7, 0x8fd525},
+	{12288000, 11289600, 0, 7, 0x59999a},
+	{11289600, 12288000, 0, 8, 0x80dee9},
+	/* liam - add more entries */
+};
+
+static int wm8974_set_dai_pll(struct snd_soc_dai *codec_dai,
+		int pll_id, unsigned int freq_in, unsigned int freq_out)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	int i;
+	u16 reg;
+
+	if(freq_in == 0 || freq_out == 0) {
+		reg = wm8974_read_reg_cache(codec, WM8974_POWER1);
+		wm8974_write(codec, WM8974_POWER1, reg & 0x1df);
+		return 0;
+	}
+
+	for(i = 0; i < ARRAY_SIZE(pll); i++) {
+		if (freq_in == pll[i].in_hz && freq_out == pll[i].out_hz) {
+			wm8974_write(codec, WM8974_PLLN, (pll[i].pre << 4) | pll[i].n);
+			wm8974_write(codec, WM8974_PLLK1, pll[i].k >> 18);
+			wm8974_write(codec, WM8974_PLLK2, (pll[i].k >> 9) & 0x1ff);
+			wm8974_write(codec, WM8974_PLLK3, pll[i].k & 0x1ff);
+			reg = wm8974_read_reg_cache(codec, WM8974_POWER1);
+			wm8974_write(codec, WM8974_POWER1, reg | 0x020);
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+/*
+ * Configure WM8974 clock dividers.
+ */
+static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai,
+		int div_id, int div)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	u16 reg;
+
+	switch (div_id) {
+	case WM8974_OPCLKDIV:
+		reg = wm8974_read_reg_cache(codec, WM8974_GPIO) & 0x1cf; 
+		wm8974_write(codec, WM8974_GPIO, reg | div);
+		break;
+	case WM8974_MCLKDIV:
+		reg = wm8974_read_reg_cache(codec, WM8974_CLOCK) & 0x11f;
+		wm8974_write(codec, WM8974_CLOCK, reg | div);
+		break;
+	case WM8974_ADCCLK:
+		reg = wm8974_read_reg_cache(codec, WM8974_ADC) & 0x1f7;
+		wm8974_write(codec, WM8974_ADC, reg | div);
+		break;
+	case WM8974_DACCLK:
+		reg = wm8974_read_reg_cache(codec, WM8974_DAC) & 0x1f7;
+		wm8974_write(codec, WM8974_DAC, reg | div);
+		break;
+	case WM8974_BCLKDIV:
+		reg = wm8974_read_reg_cache(codec, WM8974_CLOCK) & 0x1e3;
+		wm8974_write(codec, WM8974_CLOCK, reg | div);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai,
+		unsigned int fmt)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	u16 iface = 0;
+	u16 clk = wm8974_read_reg_cache(codec, WM8974_CLOCK) & 0x1fe;
+
+	/* set master/slave audio interface */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		clk |= 0x0001;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* interface format */
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		iface |= 0x0010;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		iface |= 0x0008;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		iface |= 0x00018;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* clock inversion */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		iface |= 0x0180;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		iface |= 0x0100;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		iface |= 0x0080;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	wm8974_write(codec, WM8974_IFACE, iface);
+	wm8974_write(codec, WM8974_CLOCK, clk);
+	return 0;
+}
+
+static int wm8974_pcm_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params,
+				struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	u16 iface = wm8974_read_reg_cache(codec, WM8974_IFACE) & 0x19f;
+	u16 adn = wm8974_read_reg_cache(codec, WM8974_ADD) & 0x1f1;
+
+	/* bit size */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		iface |= 0x0020;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		iface |= 0x0040;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		iface |= 0x0060;
+		break;
+	}
+
+	/* filter coefficient */
+	switch (params_rate(params)) {
+	case SNDRV_PCM_RATE_8000:
+		adn |= 0x5 << 1;
+		break;
+	case SNDRV_PCM_RATE_11025:
+		adn |= 0x4 << 1;
+		break;
+	case SNDRV_PCM_RATE_16000:
+		adn |= 0x3 << 1;
+		break;
+	case SNDRV_PCM_RATE_22050:
+		adn |= 0x2 << 1;
+		break;
+	case SNDRV_PCM_RATE_32000:
+		adn |= 0x1 << 1;
+		break;
+	case SNDRV_PCM_RATE_44100:
+		break;
+	}
+
+	wm8974_write(codec, WM8974_IFACE, iface);
+	wm8974_write(codec, WM8974_ADD, adn);
+	return 0;
+}
+
+static int wm8974_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	u16 mute_reg = wm8974_read_reg_cache(codec, WM8974_DAC) & 0xffbf;
+
+	if(mute)
+		wm8974_write(codec, WM8974_DAC, mute_reg | 0x40);
+	else
+		wm8974_write(codec, WM8974_DAC, mute_reg);
+	return 0;
+}
+
+/* liam need to make this lower power with dapm */
+static int wm8974_set_bias_level(struct snd_soc_codec *codec,
+	enum snd_soc_bias_level level)
+{
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		wm8974_write(codec, WM8974_POWER1, 0x1ff);
+		wm8974_write(codec, WM8974_POWER2, 0x1ff);
+		wm8974_write(codec, WM8974_POWER3, 0x1ff);
+		break;
+	case SND_SOC_BIAS_PREPARE:
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		break;
+	case SND_SOC_BIAS_OFF:
+		wm8974_write(codec, WM8974_POWER1, 0x0);
+		wm8974_write(codec, WM8974_POWER2, 0x0);
+		wm8974_write(codec, WM8974_POWER3, 0x0);
+		break;
+	}
+	codec->bias_level = level;
+	return 0;
+}
+
+#define WM8974_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
+		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
+		SNDRV_PCM_RATE_48000)
+
+#define WM8974_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
+	SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops wm8974_ops = {
+	.hw_params = wm8974_pcm_hw_params,
+	.digital_mute = wm8974_mute,
+	.set_fmt = wm8974_set_dai_fmt,
+	.set_clkdiv = wm8974_set_dai_clkdiv,
+	.set_pll = wm8974_set_dai_pll,
+};
+
+struct snd_soc_dai wm8974_dai = {
+	.name = "WM8974 HiFi",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = WM8974_RATES,
+		.formats = WM8974_FORMATS,},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 1,
+		.rates = WM8974_RATES,
+		.formats = WM8974_FORMATS,},
+	.ops = &wm8974_ops,
+};
+EXPORT_SYMBOL_GPL(wm8974_dai);
+
+static int wm8974_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
+	return 0;
+}
+
+static int wm8974_resume(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int i;
+	u8 data[2];
+	u16 *cache = codec->reg_cache;
+
+	/* Sync reg_cache with the hardware */
+	for (i = 0; i < ARRAY_SIZE(wm8974_reg); i++) {
+		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
+		data[1] = cache[i] & 0x00ff;
+		codec->hw_write(codec->control_data, data, 2);
+	}
+	wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+	wm8974_set_bias_level(codec, codec->suspend_bias_level);
+	return 0;
+}
+
+/*
+ * initialise the WM8974 driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int wm8974_init(struct snd_soc_device *socdev)
+{
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int ret = 0;
+
+	codec->name = "WM8974";
+	codec->owner = THIS_MODULE;
+	codec->read = wm8974_read_reg_cache;
+	codec->write = wm8974_write;
+	codec->set_bias_level = wm8974_set_bias_level;
+	codec->dai = &wm8974_dai;
+	codec->num_dai = 1;
+	codec->reg_cache_size = ARRAY_SIZE(wm8974_reg);
+	codec->reg_cache = kmemdup(wm8974_reg, sizeof(wm8974_reg), GFP_KERNEL);
+
+	if (codec->reg_cache == NULL)
+		return -ENOMEM;
+
+	wm8974_reset(codec);
+
+	/* register pcms */
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if(ret < 0) {
+		printk(KERN_ERR "wm8974: failed to create pcms\n");
+		goto pcm_err;
+	}
+
+	/* power on device */
+	wm8974_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+	wm8974_add_controls(codec);
+	wm8974_add_widgets(codec);
+	ret = snd_soc_init_card(socdev);
+	if (ret < 0) {
+		printk(KERN_ERR "wm8974: failed to register card\n");
+		goto card_err;
+	}
+	return ret;
+
+card_err:
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+pcm_err:
+	kfree(codec->reg_cache);
+	return ret;
+}
+
+static struct snd_soc_device *wm8974_socdev;
+
+#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE)
+
+/*
+ * WM8974 2 wire address is 0x1a
+ */
+#define I2C_DRIVERID_WM8974 0xfefe /* liam -  need a proper id */
+
+static unsigned short normal_i2c[] = { 0, I2C_CLIENT_END };
+
+/* Magic definition of all other variables and things */
+I2C_CLIENT_INSMOD;
+
+static struct i2c_driver wm8974_i2c_driver;
+static struct i2c_client client_template;
+
+/* If the i2c layer weren't so broken, we could pass this kind of data
+   around */
+
+static int wm8974_codec_probe(struct i2c_adapter *adap, int addr, int kind)
+{
+	struct snd_soc_device *socdev = wm8974_socdev;
+	struct wm8974_setup_data *setup = socdev->codec_data;
+	struct snd_soc_codec *codec = socdev->card->codec;
+	struct i2c_client *i2c;
+	int ret;
+
+	if (addr != setup->i2c_address)
+		return -ENODEV;
+
+	client_template.adapter = adap;
+	client_template.addr = addr;
+
+	i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
+	if (i2c == NULL) {
+		kfree(codec);
+		return -ENOMEM;
+	}
+	i2c_set_clientdata(i2c, codec);
+	codec->control_data = i2c;
+
+	ret = i2c_attach_client(i2c);
+	if (ret < 0) {
+		pr_err("failed to attach codec at addr %x\n", addr);
+		goto err;
+	}
+
+	ret = wm8974_init(socdev);
+	if (ret < 0) {
+		pr_err("failed to initialise WM8974\n");
+		goto err;
+	}
+	return ret;
+
+err:
+	kfree(codec);
+	kfree(i2c);
+	return ret;
+}
+
+static int wm8974_i2c_detach(struct i2c_client *client)
+{
+	struct snd_soc_codec *codec = i2c_get_clientdata(client);
+	i2c_detach_client(client);
+	kfree(codec->reg_cache);
+	kfree(client);
+	return 0;
+}
+
+static int wm8974_i2c_attach(struct i2c_adapter *adap)
+{
+	return i2c_probe(adap, &addr_data, wm8974_codec_probe);
+}
+
+/* corgi i2c codec control layer */
+static struct i2c_driver wm8974_i2c_driver = {
+	.driver = {
+		.name = "WM8974 I2C Codec",
+		.owner = THIS_MODULE,
+	},
+	.id =             I2C_DRIVERID_WM8974,
+	.attach_adapter = wm8974_i2c_attach,
+	.detach_client =  wm8974_i2c_detach,
+	.command =        NULL,
+};
+
+static struct i2c_client client_template = {
+	.name =   "WM8974",
+	.driver = &wm8974_i2c_driver,
+};
+#endif
+
+static int wm8974_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct wm8974_setup_data *setup;
+	struct snd_soc_codec *codec;
+	int ret = 0;
+
+	pr_info("WM8974 Audio Codec %s", WM8974_VERSION);
+
+	setup = socdev->codec_data;
+	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+	if (codec == NULL)
+		return -ENOMEM;
+
+	socdev->card->codec = codec;
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	wm8974_socdev = socdev;
+#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE)
+	if (setup->i2c_address) {
+		normal_i2c[0] = setup->i2c_address;
+		codec->hw_write = (hw_write_t)i2c_master_send;
+		ret = i2c_add_driver(&wm8974_i2c_driver);
+		if (ret != 0)
+			printk(KERN_ERR "can't add i2c driver");
+	}
+#else
+	/* Add other interfaces here */
+#endif
+	return ret;
+}
+
+/* power down chip */
+static int wm8974_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	if (codec->control_data)
+		wm8974_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE)
+	i2c_del_driver(&wm8974_i2c_driver);
+#endif
+	kfree(codec);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_wm8974 = {
+	.probe = 	wm8974_probe,
+	.remove = 	wm8974_remove,
+	.suspend = 	wm8974_suspend,
+	.resume =	wm8974_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_wm8974);
+
+static int __init wm8974_modinit(void)
+{
+	return snd_soc_register_dai(&wm8974_dai);
+}
+module_init(wm8974_modinit);
+
+static void __exit wm8974_exit(void)
+{
+	snd_soc_unregister_dai(&wm8974_dai);
+}
+module_exit(wm8974_exit);
+
+MODULE_DESCRIPTION("ASoC WM8974 driver");
+MODULE_AUTHOR("Liam Girdwood");
+MODULE_LICENSE("GPL");