ASoC: Add WM8960 CODEC driver

The WM8960 is a low power, high quality stereo codec designed for
portable digital audio applications.

Stereo class D speaker drivers provide 1W per channel into 8W loads.
Guaranteed low leakage, excellent PSRR and pop/click suppression
mechanisms enable direct battery connection for the speaker supply.

The device also integrates a complete microphone interface and a stereo
headphone driver. External component requirements are drastically
reduced as no separate microphone, speaker or headphone amplifiers are
required. Advanced on-chip digital signal processing performs automatic
level control for the microphone or line input.

Stereo 24-bit sigma-delta ADCs and DACs are used with low power
over-sampling digital interpolation and decimation filters and a
flexible digital audio interface.

The master clock can be input directly or generated internally by an
onboard PLL, supporting most commonly-used clocking schemes.

This driver was originally written by Liam Girdwood, with substantial
subsequent additions and updates for feature completeness and changes in
the ASoC framework from me.

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

1 files changed, 969 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
new file mode 100644
index 000000000000..e224d8add170
--- /dev/null
+++ b/sound/soc/codecs/wm8960.c
@@ -0,0 +1,969 @@
+/*
+ * wm8960.c  --  WM8960 ALSA SoC Audio driver
+ *
+ * Author: Liam Girdwood
+ *
+ * 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/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 <sound/tlv.h>
+
+#include "wm8960.h"
+
+#define AUDIO_NAME "wm8960"
+
+struct snd_soc_codec_device soc_codec_dev_wm8960;
+
+/* R25 - Power 1 */
+#define WM8960_VREF      0x40
+
+/* R28 - Anti-pop 1 */
+#define WM8960_POBCTRL   0x80
+#define WM8960_BUFDCOPEN 0x10
+#define WM8960_BUFIOEN   0x08
+#define WM8960_SOFT_ST   0x04
+#define WM8960_HPSTBY    0x01
+
+/* R29 - Anti-pop 2 */
+#define WM8960_DISOP     0x40
+
+/*
+ * wm8960 register cache
+ * We can't read the WM8960 register space when we are
+ * using 2 wire for device control, so we cache them instead.
+ */
+static const u16 wm8960_reg[WM8960_CACHEREGNUM] = {
+	0x0097, 0x0097, 0x0000, 0x0000,
+	0x0000, 0x0008, 0x0000, 0x000a,
+	0x01c0, 0x0000, 0x00ff, 0x00ff,
+	0x0000, 0x0000, 0x0000, 0x0000,
+	0x0000, 0x007b, 0x0100, 0x0032,
+	0x0000, 0x00c3, 0x00c3, 0x01c0,
+	0x0000, 0x0000, 0x0000, 0x0000,
+	0x0000, 0x0000, 0x0000, 0x0000,
+	0x0100, 0x0100, 0x0050, 0x0050,
+	0x0050, 0x0050, 0x0000, 0x0000,
+	0x0000, 0x0000, 0x0040, 0x0000,
+	0x0000, 0x0050, 0x0050, 0x0000,
+	0x0002, 0x0037, 0x004d, 0x0080,
+	0x0008, 0x0031, 0x0026, 0x00e9,
+};
+
+struct wm8960_priv {
+	u16 reg_cache[WM8960_CACHEREGNUM];
+	struct snd_soc_codec codec;
+};
+
+/*
+ * read wm8960 register cache
+ */
+static inline unsigned int wm8960_read_reg_cache(struct snd_soc_codec *codec,
+	unsigned int reg)
+{
+	u16 *cache = codec->reg_cache;
+	if (reg == WM8960_RESET)
+		return 0;
+	if (reg >= WM8960_CACHEREGNUM)
+		return -1;
+	return cache[reg];
+}
+
+/*
+ * write wm8960 register cache
+ */
+static inline void wm8960_write_reg_cache(struct snd_soc_codec *codec,
+	u16 reg, unsigned int value)
+{
+	u16 *cache = codec->reg_cache;
+	if (reg >= WM8960_CACHEREGNUM)
+		return;
+	cache[reg] = value;
+}
+
+static inline unsigned int wm8960_read(struct snd_soc_codec *codec,
+	unsigned int reg)
+{
+	return wm8960_read_reg_cache(codec, reg);
+}
+
+/*
+ * write to the WM8960 register space
+ */
+static int wm8960_write(struct snd_soc_codec *codec, unsigned int reg,
+	unsigned int value)
+{
+	u8 data[2];
+
+	/* data is
+	 *   D15..D9 WM8960 register offset
+	 *   D8...D0 register data
+	 */
+	data[0] = (reg << 1) | ((value >> 8) & 0x0001);
+	data[1] = value & 0x00ff;
+
+	wm8960_write_reg_cache(codec, reg, value);
+	if (codec->hw_write(codec->control_data, data, 2) == 2)
+		return 0;
+	else
+		return -EIO;
+}
+
+#define wm8960_reset(c)	wm8960_write(c, WM8960_RESET, 0)
+
+/* enumerated controls */
+static const char *wm8960_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
+static const char *wm8960_polarity[] = {"No Inversion", "Left Inverted",
+	"Right Inverted", "Stereo Inversion"};
+static const char *wm8960_3d_upper_cutoff[] = {"High", "Low"};
+static const char *wm8960_3d_lower_cutoff[] = {"Low", "High"};
+static const char *wm8960_alcfunc[] = {"Off", "Right", "Left", "Stereo"};
+static const char *wm8960_alcmode[] = {"ALC", "Limiter"};
+
+static const struct soc_enum wm8960_enum[] = {
+	SOC_ENUM_SINGLE(WM8960_DACCTL1, 1, 4, wm8960_deemph),
+	SOC_ENUM_SINGLE(WM8960_DACCTL1, 5, 4, wm8960_polarity),
+	SOC_ENUM_SINGLE(WM8960_DACCTL2, 5, 4, wm8960_polarity),
+	SOC_ENUM_SINGLE(WM8960_3D, 6, 2, wm8960_3d_upper_cutoff),
+	SOC_ENUM_SINGLE(WM8960_3D, 5, 2, wm8960_3d_lower_cutoff),
+	SOC_ENUM_SINGLE(WM8960_ALC1, 7, 4, wm8960_alcfunc),
+	SOC_ENUM_SINGLE(WM8960_ALC3, 8, 2, wm8960_alcmode),
+};
+
+static const DECLARE_TLV_DB_SCALE(adc_tlv, -9700, 50, 0);
+static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 50, 1);
+static const DECLARE_TLV_DB_SCALE(bypass_tlv, -2100, 300, 0);
+static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1);
+
+static const struct snd_kcontrol_new wm8960_snd_controls[] = {
+SOC_DOUBLE_R_TLV("Capture Volume", WM8960_LINVOL, WM8960_RINVOL,
+		 0, 63, 0, adc_tlv),
+SOC_DOUBLE_R("Capture Volume ZC Switch", WM8960_LINVOL, WM8960_RINVOL,
+	6, 1, 0),
+SOC_DOUBLE_R("Capture Switch", WM8960_LINVOL, WM8960_RINVOL,
+	7, 1, 0),
+
+SOC_DOUBLE_R_TLV("Playback Volume", WM8960_LDAC, WM8960_RDAC,
+		 0, 255, 0, dac_tlv),
+
+SOC_DOUBLE_R_TLV("Headphone Playback Volume", WM8960_LOUT1, WM8960_ROUT1,
+		 0, 127, 0, out_tlv),
+SOC_DOUBLE_R("Headphone Playback ZC Switch", WM8960_LOUT1, WM8960_ROUT1,
+	7, 1, 0),
+
+SOC_DOUBLE_R_TLV("Speaker Playback Volume", WM8960_LOUT2, WM8960_ROUT2,
+		 0, 127, 0, out_tlv),
+SOC_DOUBLE_R("Speaker Playback ZC Switch", WM8960_LOUT2, WM8960_ROUT2,
+	7, 1, 0),
+SOC_SINGLE("Speaker DC Volume", WM8960_CLASSD3, 3, 5, 0),
+SOC_SINGLE("Speaker AC Volume", WM8960_CLASSD3, 0, 5, 0),
+
+SOC_SINGLE("PCM Playback -6dB Switch", WM8960_DACCTL1, 7, 1, 0),
+SOC_ENUM("ADC Polarity", wm8960_enum[1]),
+SOC_ENUM("Playback De-emphasis", wm8960_enum[0]),
+SOC_SINGLE("ADC High Pass Filter Switch", WM8960_DACCTL1, 0, 1, 0),
+
+SOC_ENUM("DAC Polarity", wm8960_enum[2]),
+
+SOC_ENUM("3D Filter Upper Cut-Off", wm8960_enum[3]),
+SOC_ENUM("3D Filter Lower Cut-Off", wm8960_enum[4]),
+SOC_SINGLE("3D Volume", WM8960_3D, 1, 15, 0),
+SOC_SINGLE("3D Switch", WM8960_3D, 0, 1, 0),
+
+SOC_ENUM("ALC Function", wm8960_enum[5]),
+SOC_SINGLE("ALC Max Gain", WM8960_ALC1, 4, 7, 0),
+SOC_SINGLE("ALC Target", WM8960_ALC1, 0, 15, 1),
+SOC_SINGLE("ALC Min Gain", WM8960_ALC2, 4, 7, 0),
+SOC_SINGLE("ALC Hold Time", WM8960_ALC2, 0, 15, 0),
+SOC_ENUM("ALC Mode", wm8960_enum[6]),
+SOC_SINGLE("ALC Decay", WM8960_ALC3, 4, 15, 0),
+SOC_SINGLE("ALC Attack", WM8960_ALC3, 0, 15, 0),
+
+SOC_SINGLE("Noise Gate Threshold", WM8960_NOISEG, 3, 31, 0),
+SOC_SINGLE("Noise Gate Switch", WM8960_NOISEG, 0, 1, 0),
+
+SOC_DOUBLE_R("ADC PCM Capture Volume", WM8960_LINPATH, WM8960_RINPATH,
+	0, 127, 0),
+
+SOC_SINGLE_TLV("Left Output Mixer Boost Bypass Volume",
+	       WM8960_BYPASS1, 4, 7, 1, bypass_tlv),
+SOC_SINGLE_TLV("Left Output Mixer LINPUT3 Volume",
+	       WM8960_LOUTMIX, 4, 7, 1, bypass_tlv),
+SOC_SINGLE_TLV("Right Output Mixer Boost Bypass Volume",
+	       WM8960_BYPASS2, 4, 7, 1, bypass_tlv),
+SOC_SINGLE_TLV("Right Output Mixer RINPUT3 Volume",
+	       WM8960_ROUTMIX, 4, 7, 1, bypass_tlv),
+};
+
+static const struct snd_kcontrol_new wm8960_lin_boost[] = {
+SOC_DAPM_SINGLE("LINPUT2 Switch", WM8960_LINPATH, 6, 1, 0),
+SOC_DAPM_SINGLE("LINPUT3 Switch", WM8960_LINPATH, 7, 1, 0),
+SOC_DAPM_SINGLE("LINPUT1 Switch", WM8960_LINPATH, 8, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8960_lin[] = {
+SOC_DAPM_SINGLE("Boost Switch", WM8960_LINPATH, 3, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8960_rin_boost[] = {
+SOC_DAPM_SINGLE("RINPUT2 Switch", WM8960_RINPATH, 6, 1, 0),
+SOC_DAPM_SINGLE("RINPUT3 Switch", WM8960_RINPATH, 7, 1, 0),
+SOC_DAPM_SINGLE("RINPUT1 Switch", WM8960_RINPATH, 8, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8960_rin[] = {
+SOC_DAPM_SINGLE("Boost Switch", WM8960_RINPATH, 3, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8960_loutput_mixer[] = {
+SOC_DAPM_SINGLE("PCM Playback Switch", WM8960_LOUTMIX, 8, 1, 0),
+SOC_DAPM_SINGLE("LINPUT3 Switch", WM8960_LOUTMIX, 7, 1, 0),
+SOC_DAPM_SINGLE("Boost Bypass Switch", WM8960_BYPASS1, 7, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8960_routput_mixer[] = {
+SOC_DAPM_SINGLE("PCM Playback Switch", WM8960_ROUTMIX, 8, 1, 0),
+SOC_DAPM_SINGLE("RINPUT3 Switch", WM8960_ROUTMIX, 7, 1, 0),
+SOC_DAPM_SINGLE("Boost Bypass Switch", WM8960_BYPASS2, 7, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8960_mono_out[] = {
+SOC_DAPM_SINGLE("Left Switch", WM8960_MONOMIX1, 7, 1, 0),
+SOC_DAPM_SINGLE("Right Switch", WM8960_MONOMIX2, 7, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget wm8960_dapm_widgets[] = {
+SND_SOC_DAPM_INPUT("LINPUT1"),
+SND_SOC_DAPM_INPUT("RINPUT1"),
+SND_SOC_DAPM_INPUT("LINPUT2"),
+SND_SOC_DAPM_INPUT("RINPUT2"),
+SND_SOC_DAPM_INPUT("LINPUT3"),
+SND_SOC_DAPM_INPUT("RINPUT3"),
+
+SND_SOC_DAPM_MICBIAS("MICB", WM8960_POWER1, 1, 0),
+
+SND_SOC_DAPM_MIXER("Left Boost Mixer", WM8960_POWER1, 5, 0,
+		   wm8960_lin_boost, ARRAY_SIZE(wm8960_lin_boost)),
+SND_SOC_DAPM_MIXER("Right Boost Mixer", WM8960_POWER1, 4, 0,
+		   wm8960_rin_boost, ARRAY_SIZE(wm8960_rin_boost)),
+
+SND_SOC_DAPM_MIXER("Left Input Mixer", WM8960_POWER3, 5, 0,
+		   wm8960_lin, ARRAY_SIZE(wm8960_lin)),
+SND_SOC_DAPM_MIXER("Right Input Mixer", WM8960_POWER3, 4, 0,
+		   wm8960_rin, ARRAY_SIZE(wm8960_rin)),
+
+SND_SOC_DAPM_ADC("Left ADC", "Capture", WM8960_POWER2, 3, 0),
+SND_SOC_DAPM_ADC("Right ADC", "Capture", WM8960_POWER2, 2, 0),
+
+SND_SOC_DAPM_DAC("Left DAC", "Playback", WM8960_POWER2, 8, 0),
+SND_SOC_DAPM_DAC("Right DAC", "Playback", WM8960_POWER2, 7, 0),
+
+SND_SOC_DAPM_MIXER("Left Output Mixer", WM8960_POWER3, 3, 0,
+	&wm8960_loutput_mixer[0],
+	ARRAY_SIZE(wm8960_loutput_mixer)),
+SND_SOC_DAPM_MIXER("Right Output Mixer", WM8960_POWER3, 2, 0,
+	&wm8960_routput_mixer[0],
+	ARRAY_SIZE(wm8960_routput_mixer)),
+
+SND_SOC_DAPM_MIXER("Mono Output Mixer", WM8960_POWER2, 1, 0,
+	&wm8960_mono_out[0],
+	ARRAY_SIZE(wm8960_mono_out)),
+
+SND_SOC_DAPM_PGA("LOUT1 PGA", WM8960_POWER2, 6, 0, NULL, 0),
+SND_SOC_DAPM_PGA("ROUT1 PGA", WM8960_POWER2, 5, 0, NULL, 0),
+
+SND_SOC_DAPM_PGA("Left Speaker PGA", WM8960_POWER2, 4, 0, NULL, 0),
+SND_SOC_DAPM_PGA("Right Speaker PGA", WM8960_POWER2, 3, 0, NULL, 0),
+
+SND_SOC_DAPM_PGA("Right Speaker Output", WM8960_CLASSD1, 7, 0, NULL, 0),
+SND_SOC_DAPM_PGA("Left Speaker Output", WM8960_CLASSD1, 6, 0, NULL, 0),
+
+SND_SOC_DAPM_OUTPUT("SPK_LP"),
+SND_SOC_DAPM_OUTPUT("SPK_LN"),
+SND_SOC_DAPM_OUTPUT("HP_L"),
+SND_SOC_DAPM_OUTPUT("HP_R"),
+SND_SOC_DAPM_OUTPUT("SPK_RP"),
+SND_SOC_DAPM_OUTPUT("SPK_RN"),
+SND_SOC_DAPM_OUTPUT("OUT3"),
+};
+
+static const struct snd_soc_dapm_route audio_paths[] = {
+	{ "Left Boost Mixer", "LINPUT1 Switch", "LINPUT1" },
+	{ "Left Boost Mixer", "LINPUT2 Switch", "LINPUT2" },
+	{ "Left Boost Mixer", "LINPUT3 Switch", "LINPUT3" },
+
+	{ "Left Input Mixer", "Boost Switch", "Left Boost Mixer", },
+	{ "Left Input Mixer", NULL, "LINPUT1", },  /* Really Boost Switch */
+	{ "Left Input Mixer", NULL, "LINPUT2" },
+	{ "Left Input Mixer", NULL, "LINPUT3" },
+
+	{ "Right Boost Mixer", "RINPUT1 Switch", "RINPUT1" },
+	{ "Right Boost Mixer", "RINPUT2 Switch", "RINPUT2" },
+	{ "Right Boost Mixer", "RINPUT3 Switch", "RINPUT3" },
+
+	{ "Right Input Mixer", "Boost Switch", "Right Boost Mixer", },
+	{ "Right Input Mixer", NULL, "RINPUT1", },  /* Really Boost Switch */
+	{ "Right Input Mixer", NULL, "RINPUT2" },
+	{ "Right Input Mixer", NULL, "LINPUT3" },
+
+	{ "Left ADC", NULL, "Left Input Mixer" },
+	{ "Right ADC", NULL, "Right Input Mixer" },
+
+	{ "Left Output Mixer", "LINPUT3 Switch", "LINPUT3" },
+	{ "Left Output Mixer", "Boost Bypass Switch", "Left Boost Mixer"} ,
+	{ "Left Output Mixer", "PCM Playback Switch", "Left DAC" },
+
+	{ "Right Output Mixer", "RINPUT3 Switch", "RINPUT3" },
+	{ "Right Output Mixer", "Boost Bypass Switch", "Right Boost Mixer" } ,
+	{ "Right Output Mixer", "PCM Playback Switch", "Right DAC" },
+
+	{ "Mono Output Mixer", "Left Switch", "Left Output Mixer" },
+	{ "Mono Output Mixer", "Right Switch", "Right Output Mixer" },
+
+	{ "LOUT1 PGA", NULL, "Left Output Mixer" },
+	{ "ROUT1 PGA", NULL, "Right Output Mixer" },
+
+	{ "HP_L", NULL, "LOUT1 PGA" },
+	{ "HP_R", NULL, "ROUT1 PGA" },
+
+	{ "Left Speaker PGA", NULL, "Left Output Mixer" },
+	{ "Right Speaker PGA", NULL, "Right Output Mixer" },
+
+	{ "Left Speaker Output", NULL, "Left Speaker PGA" },
+	{ "Right Speaker Output", NULL, "Right Speaker PGA" },
+
+	{ "SPK_LN", NULL, "Left Speaker Output" },
+	{ "SPK_LP", NULL, "Left Speaker Output" },
+	{ "SPK_RN", NULL, "Right Speaker Output" },
+	{ "SPK_RP", NULL, "Right Speaker Output" },
+
+	{ "OUT3", NULL, "Mono Output Mixer", }
+};
+
+static int wm8960_add_widgets(struct snd_soc_codec *codec)
+{
+	snd_soc_dapm_new_controls(codec, wm8960_dapm_widgets,
+				  ARRAY_SIZE(wm8960_dapm_widgets));
+
+	snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
+
+	snd_soc_dapm_new_widgets(codec);
+	return 0;
+}
+
+static int wm8960_set_dai_fmt(struct snd_soc_dai *codec_dai,
+		unsigned int fmt)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	u16 iface = 0;
+
+	/* set master/slave audio interface */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		iface |= 0x0040;
+		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 |= 0x0002;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		iface |= 0x0001;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		iface |= 0x0003;
+		break;
+	case SND_SOC_DAIFMT_DSP_B:
+		iface |= 0x0013;
+		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 |= 0x0090;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		iface |= 0x0080;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		iface |= 0x0010;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* set iface */
+	wm8960_write(codec, WM8960_IFACE1, iface);
+	return 0;
+}
+
+static int wm8960_hw_params(struct snd_pcm_substream *substream,
+			    struct snd_pcm_hw_params *params,
+			    struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_device *socdev = rtd->socdev;
+	struct snd_soc_codec *codec = socdev->card->codec;
+	u16 iface = wm8960_read(codec, WM8960_IFACE1) & 0xfff3;
+
+	/* bit size */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		iface |= 0x0004;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		iface |= 0x0008;
+		break;
+	}
+
+	/* set iface */
+	wm8960_write(codec, WM8960_IFACE1, iface);
+	return 0;
+}
+
+static int wm8960_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	u16 mute_reg = wm8960_read(codec, WM8960_DACCTL1) & 0xfff7;
+
+	if (mute)
+		wm8960_write(codec, WM8960_DACCTL1, mute_reg | 0x8);
+	else
+		wm8960_write(codec, WM8960_DACCTL1, mute_reg);
+	return 0;
+}
+
+static int wm8960_set_bias_level(struct snd_soc_codec *codec,
+				 enum snd_soc_bias_level level)
+{
+	struct wm8960_data *pdata = codec->dev->platform_data;
+	u16 reg;
+
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		break;
+
+	case SND_SOC_BIAS_PREPARE:
+		/* Set VMID to 2x50k */
+		reg = wm8960_read(codec, WM8960_POWER1);
+		reg &= ~0x180;
+		reg |= 0x80;
+		wm8960_write(codec, WM8960_POWER1, reg);
+		break;
+
+	case SND_SOC_BIAS_STANDBY:
+		if (codec->bias_level == SND_SOC_BIAS_OFF) {
+			/* Enable anti-pop features */
+			wm8960_write(codec, WM8960_APOP1,
+				     WM8960_POBCTRL | WM8960_SOFT_ST |
+				     WM8960_BUFDCOPEN | WM8960_BUFIOEN);
+
+			/* Discharge HP output */
+			reg = WM8960_DISOP;
+			if (pdata)
+				reg |= pdata->dres << 4;
+			wm8960_write(codec, WM8960_APOP2, reg);
+
+			msleep(400);
+
+			wm8960_write(codec, WM8960_APOP2, 0);
+
+			/* Enable & ramp VMID at 2x50k */
+			reg = wm8960_read(codec, WM8960_POWER1);
+			reg |= 0x80;
+			wm8960_write(codec, WM8960_POWER1, reg);
+			msleep(100);
+
+			/* Enable VREF */
+			wm8960_write(codec, WM8960_POWER1, reg | WM8960_VREF);
+
+			/* Disable anti-pop features */
+			wm8960_write(codec, WM8960_APOP1, WM8960_BUFIOEN);
+		}
+
+		/* Set VMID to 2x250k */
+		reg = wm8960_read(codec, WM8960_POWER1);
+		reg &= ~0x180;
+		reg |= 0x100;
+		wm8960_write(codec, WM8960_POWER1, reg);
+		break;
+
+	case SND_SOC_BIAS_OFF:
+		/* Enable anti-pop features */
+		wm8960_write(codec, WM8960_APOP1,
+			     WM8960_POBCTRL | WM8960_SOFT_ST |
+			     WM8960_BUFDCOPEN | WM8960_BUFIOEN);
+
+		/* Disable VMID and VREF, let them discharge */
+		wm8960_write(codec, WM8960_POWER1, 0);
+		msleep(600);
+
+		wm8960_write(codec, WM8960_APOP1, 0);
+		break;
+	}
+
+	codec->bias_level = level;
+
+	return 0;
+}
+
+/* PLL divisors */
+struct _pll_div {
+	u32 pre_div:1;
+	u32 n:4;
+	u32 k:24;
+};
+
+/* The size in bits of the pll divide multiplied by 10
+ * to allow rounding later */
+#define FIXED_PLL_SIZE ((1 << 24) * 10)
+
+static int pll_factors(unsigned int source, unsigned int target,
+		       struct _pll_div *pll_div)
+{
+	unsigned long long Kpart;
+	unsigned int K, Ndiv, Nmod;
+
+	pr_debug("WM8960 PLL: setting %dHz->%dHz\n", source, target);
+
+	/* Scale up target to PLL operating frequency */
+	target *= 4;
+
+	Ndiv = target / source;
+	if (Ndiv < 6) {
+		source >>= 1;
+		pll_div->pre_div = 1;
+		Ndiv = target / source;
+	} else
+		pll_div->pre_div = 0;
+
+	if ((Ndiv < 6) || (Ndiv > 12)) {
+		pr_err("WM8960 PLL: Unsupported N=%d\n", Ndiv);
+		return -EINVAL;
+	}
+
+	pll_div->n = Ndiv;
+	Nmod = target % source;
+	Kpart = FIXED_PLL_SIZE * (long long)Nmod;
+
+	do_div(Kpart, source);
+
+	K = Kpart & 0xFFFFFFFF;
+
+	/* Check if we need to round */
+	if ((K % 10) >= 5)
+		K += 5;
+
+	/* Move down to proper range now rounding is done */
+	K /= 10;
+
+	pll_div->k = K;
+
+	pr_debug("WM8960 PLL: N=%x K=%x pre_div=%d\n",
+		 pll_div->n, pll_div->k, pll_div->pre_div);
+
+	return 0;
+}
+
+static int wm8960_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;
+	u16 reg;
+	static struct _pll_div pll_div;
+	int ret;
+
+	if (freq_in && freq_out) {
+		ret = pll_factors(freq_in, freq_out, &pll_div);
+		if (ret != 0)
+			return ret;
+	}
+
+	/* Disable the PLL: even if we are changing the frequency the
+	 * PLL needs to be disabled while we do so. */
+	wm8960_write(codec, WM8960_CLOCK1,
+		     wm8960_read(codec, WM8960_CLOCK1) & ~1);
+	wm8960_write(codec, WM8960_POWER2,
+		     wm8960_read(codec, WM8960_POWER2) & ~1);
+
+	if (!freq_in || !freq_out)
+		return 0;
+
+	reg = wm8960_read(codec, WM8960_PLL1) & ~0x3f;
+	reg |= pll_div.pre_div << 4;
+	reg |= pll_div.n;
+
+	if (pll_div.k) {
+		reg |= 0x20;
+
+		wm8960_write(codec, WM8960_PLL2, (pll_div.k >> 18) & 0x3f);
+		wm8960_write(codec, WM8960_PLL3, (pll_div.k >> 9) & 0x1ff);
+		wm8960_write(codec, WM8960_PLL4, pll_div.k & 0x1ff);
+	}
+	wm8960_write(codec, WM8960_PLL1, reg);
+
+	/* Turn it on */
+	wm8960_write(codec, WM8960_POWER2,
+		     wm8960_read(codec, WM8960_POWER2) | 1);
+	msleep(250);
+	wm8960_write(codec, WM8960_CLOCK1,
+		     wm8960_read(codec, WM8960_CLOCK1) | 1);
+
+	return 0;
+}
+
+static int wm8960_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 WM8960_SYSCLKSEL:
+		reg = wm8960_read(codec, WM8960_CLOCK1) & 0x1fe;
+		wm8960_write(codec, WM8960_CLOCK1, reg | div);
+		break;
+	case WM8960_SYSCLKDIV:
+		reg = wm8960_read(codec, WM8960_CLOCK1) & 0x1f9;
+		wm8960_write(codec, WM8960_CLOCK1, reg | div);
+		break;
+	case WM8960_DACDIV:
+		reg = wm8960_read(codec, WM8960_CLOCK1) & 0x1c7;
+		wm8960_write(codec, WM8960_CLOCK1, reg | div);
+		break;
+	case WM8960_OPCLKDIV:
+		reg = wm8960_read(codec, WM8960_PLL1) & 0x03f;
+		wm8960_write(codec, WM8960_PLL1, reg | div);
+		break;
+	case WM8960_DCLKDIV:
+		reg = wm8960_read(codec, WM8960_CLOCK2) & 0x03f;
+		wm8960_write(codec, WM8960_CLOCK2, reg | div);
+		break;
+	case WM8960_TOCLKSEL:
+		reg = wm8960_read(codec, WM8960_ADDCTL1) & 0x1fd;
+		wm8960_write(codec, WM8960_ADDCTL1, reg | div);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+#define WM8960_RATES SNDRV_PCM_RATE_8000_48000
+
+#define WM8960_FORMATS \
+	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+	SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops wm8960_dai_ops = {
+	.hw_params = wm8960_hw_params,
+	.digital_mute = wm8960_mute,
+	.set_fmt = wm8960_set_dai_fmt,
+	.set_clkdiv = wm8960_set_dai_clkdiv,
+	.set_pll = wm8960_set_dai_pll,
+};
+
+struct snd_soc_dai wm8960_dai = {
+	.name = "WM8960",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = WM8960_RATES,
+		.formats = WM8960_FORMATS,},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = WM8960_RATES,
+		.formats = WM8960_FORMATS,},
+	.ops = &wm8960_dai_ops,
+	.symmetric_rates = 1,
+};
+EXPORT_SYMBOL_GPL(wm8960_dai);
+
+static int wm8960_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;
+
+	wm8960_set_bias_level(codec, SND_SOC_BIAS_OFF);
+	return 0;
+}
+
+static int wm8960_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(wm8960_reg); i++) {
+		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
+		data[1] = cache[i] & 0x00ff;
+		codec->hw_write(codec->control_data, data, 2);
+	}
+
+	wm8960_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+	wm8960_set_bias_level(codec, codec->suspend_bias_level);
+	return 0;
+}
+
+static struct snd_soc_codec *wm8960_codec;
+
+static int wm8960_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec;
+	int ret = 0;
+
+	if (wm8960_codec == NULL) {
+		dev_err(&pdev->dev, "Codec device not registered\n");
+		return -ENODEV;
+	}
+
+	socdev->card->codec = wm8960_codec;
+	codec = wm8960_codec;
+
+	/* register pcms */
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if (ret < 0) {
+		dev_err(codec->dev, "failed to create pcms: %d\n", ret);
+		goto pcm_err;
+	}
+
+	snd_soc_add_controls(codec, wm8960_snd_controls,
+			     ARRAY_SIZE(wm8960_snd_controls));
+	wm8960_add_widgets(codec);
+	ret = snd_soc_init_card(socdev);
+	if (ret < 0) {
+		dev_err(codec->dev, "failed to register card: %d\n", ret);
+		goto card_err;
+	}
+
+	return ret;
+
+card_err:
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+pcm_err:
+	return ret;
+}
+
+/* power down chip */
+static int wm8960_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_wm8960 = {
+	.probe = 	wm8960_probe,
+	.remove = 	wm8960_remove,
+	.suspend = 	wm8960_suspend,
+	.resume =	wm8960_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_wm8960);
+
+static int wm8960_register(struct wm8960_priv *wm8960)
+{
+	struct wm8960_data *pdata = wm8960->codec.dev->platform_data;
+	struct snd_soc_codec *codec = &wm8960->codec;
+	int ret;
+	u16 reg;
+
+	if (wm8960_codec) {
+		dev_err(codec->dev, "Another WM8960 is registered\n");
+		return -EINVAL;
+	}
+
+	if (!pdata) {
+		dev_warn(codec->dev, "No platform data supplied\n");
+	} else {
+		if (pdata->dres > WM8960_DRES_MAX) {
+			dev_err(codec->dev, "Invalid DRES: %d\n", pdata->dres);
+			pdata->dres = 0;
+		}
+	}
+
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	codec->private_data = wm8960;
+	codec->name = "WM8960";
+	codec->owner = THIS_MODULE;
+	codec->read = wm8960_read_reg_cache;
+	codec->write = wm8960_write;
+	codec->bias_level = SND_SOC_BIAS_OFF;
+	codec->set_bias_level = wm8960_set_bias_level;
+	codec->dai = &wm8960_dai;
+	codec->num_dai = 1;
+	codec->reg_cache_size = WM8960_CACHEREGNUM;
+	codec->reg_cache = &wm8960->reg_cache;
+
+	memcpy(codec->reg_cache, wm8960_reg, sizeof(wm8960_reg));
+
+	ret = wm8960_reset(codec);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to issue reset\n");
+		return ret;
+	}
+
+	wm8960_dai.dev = codec->dev;
+
+	wm8960_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	/* Latch the update bits */
+	reg = wm8960_read(codec, WM8960_LINVOL);
+	wm8960_write(codec, WM8960_LINVOL, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_RINVOL);
+	wm8960_write(codec, WM8960_RINVOL, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_LADC);
+	wm8960_write(codec, WM8960_LADC, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_RADC);
+	wm8960_write(codec, WM8960_RADC, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_LDAC);
+	wm8960_write(codec, WM8960_LDAC, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_RDAC);
+	wm8960_write(codec, WM8960_RDAC, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_LOUT1);
+	wm8960_write(codec, WM8960_LOUT1, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_ROUT1);
+	wm8960_write(codec, WM8960_ROUT1, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_LOUT2);
+	wm8960_write(codec, WM8960_LOUT2, reg | 0x100);
+	reg = wm8960_read(codec, WM8960_ROUT2);
+	wm8960_write(codec, WM8960_ROUT2, reg | 0x100);
+
+	wm8960_codec = codec;
+
+	ret = snd_soc_register_codec(codec);
+	if (ret != 0) {
+		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_register_dai(&wm8960_dai);
+	if (ret != 0) {
+		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
+		snd_soc_unregister_codec(codec);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void wm8960_unregister(struct wm8960_priv *wm8960)
+{
+	wm8960_set_bias_level(&wm8960->codec, SND_SOC_BIAS_OFF);
+	snd_soc_unregister_dai(&wm8960_dai);
+	snd_soc_unregister_codec(&wm8960->codec);
+	kfree(wm8960);
+	wm8960_codec = NULL;
+}
+
+static __devinit int wm8960_i2c_probe(struct i2c_client *i2c,
+				      const struct i2c_device_id *id)
+{
+	struct wm8960_priv *wm8960;
+	struct snd_soc_codec *codec;
+
+	wm8960 = kzalloc(sizeof(struct wm8960_priv), GFP_KERNEL);
+	if (wm8960 == NULL)
+		return -ENOMEM;
+
+	codec = &wm8960->codec;
+	codec->hw_write = (hw_write_t)i2c_master_send;
+
+	i2c_set_clientdata(i2c, wm8960);
+	codec->control_data = i2c;
+
+	codec->dev = &i2c->dev;
+
+	return wm8960_register(wm8960);
+}
+
+static __devexit int wm8960_i2c_remove(struct i2c_client *client)
+{
+	struct wm8960_priv *wm8960 = i2c_get_clientdata(client);
+	wm8960_unregister(wm8960);
+	return 0;
+}
+
+static const struct i2c_device_id wm8960_i2c_id[] = {
+	{ "wm8960", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, wm8960_i2c_id);
+
+static struct i2c_driver wm8960_i2c_driver = {
+	.driver = {
+		.name = "WM8960 I2C Codec",
+		.owner = THIS_MODULE,
+	},
+	.probe =    wm8960_i2c_probe,
+	.remove =   __devexit_p(wm8960_i2c_remove),
+	.id_table = wm8960_i2c_id,
+};
+
+static int __init wm8960_modinit(void)
+{
+	int ret;
+
+	ret = i2c_add_driver(&wm8960_i2c_driver);
+	if (ret != 0) {
+		printk(KERN_ERR "Failed to register WM8960 I2C driver: %d\n",
+		       ret);
+	}
+
+	return ret;
+}
+module_init(wm8960_modinit);
+
+static void __exit wm8960_exit(void)
+{
+	i2c_del_driver(&wm8960_i2c_driver);
+}
+module_exit(wm8960_exit);
+
+
+MODULE_DESCRIPTION("ASoC WM8960 driver");
+MODULE_AUTHOR("Liam Girdwood");
+MODULE_LICENSE("GPL");