[ALSA] ASoC: Add WM8510 driver

The WM8510 is a mono CODEC with speaker driver optimised for telephony
applications, featuring:
 - 16/20/24/32 bit audio at data rates between 8kHz and 48kHz
 - On-chip PLL
 - Dual microphone inputs

This driver was originally written by Liam Girdwood with updates from
Brett Saunders, Geoffrey Wossum and myself.

Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Brett Saunders <breton.saunders@ntlworld.com>
Signed-off-by: Geoffrey Wossum <geoffrey@pager.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 836 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8510.c b/sound/soc/codecs/wm8510.c
new file mode 100644
index 000000000000..6f54cb0f50fd
--- /dev/null
+++ b/sound/soc/codecs/wm8510.c
@@ -0,0 +1,836 @@
+/*
+ * wm8510.c  --  WM8510 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/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 "wm8510.h"
+
+#define AUDIO_NAME "wm8510"
+#define WM8510_VERSION "0.6"
+
+/*
+ * Debug
+ */
+
+#define WM8510_DEBUG 0
+
+#ifdef WM8510_DEBUG
+#define dbg(format, arg...) \
+        printk(KERN_DEBUG AUDIO_NAME ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+#define err(format, arg...) \
+        printk(KERN_ERR AUDIO_NAME ": " format "\n" , ## arg)
+#define info(format, arg...) \
+        printk(KERN_INFO AUDIO_NAME ": " format "\n" , ## arg)
+#define warn(format, arg...) \
+        printk(KERN_WARNING AUDIO_NAME ": " format "\n" , ## arg)
+
+struct snd_soc_codec_device soc_codec_dev_wm8510;
+
+/*
+ * wm8510 register cache
+ * We can't read the WM8510 register space when we are
+ * using 2 wire for device control, so we cache them instead.
+ */
+static const u16 wm8510_reg[WM8510_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, 0x0001, 0x0000,
+        0x0000, 0x0000, 0x0039, 0x0000,
+        0x0000,
+};
+
+/*
+ * read wm8510 register cache
+ */
+static inline unsigned int wm8510_read_reg_cache(struct snd_soc_codec *codec,
+        unsigned int reg)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg == WM8510_RESET)
+                return 0;
+        if (reg >= WM8510_CACHEREGNUM)
+                return -1;
+        return cache[reg];
+}
+
+/*
+ * write wm8510 register cache
+ */
+static inline void wm8510_write_reg_cache(struct snd_soc_codec *codec,
+        u16 reg, unsigned int value)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= WM8510_CACHEREGNUM)
+                return;
+        cache[reg] = value;
+}
+
+/*
+ * write to the WM8510 register space
+ */
+static int wm8510_write(struct snd_soc_codec *codec, unsigned int reg,
+        unsigned int value)
+{
+        u8 data[2];
+
+        /* data is
+         *   D15..D9 WM8510 register offset
+         *   D8...D0 register data
+         */
+        data[0] = (reg << 1) | ((value >> 8) & 0x0001);
+        data[1] = value & 0x00ff;
+
+        wm8510_write_reg_cache(codec, reg, value);
+        if (codec->hw_write(codec->control_data, data, 2) == 2)
+                return 0;
+        else
+                return -EIO;
+}
+
+#define wm8510_reset(c) wm8510_write(c, WM8510_RESET, 0)
+
+static const char *wm8510_companding[] = { "Off", "NC", "u-law", "A-law" };
+static const char *wm8510_deemp[] = { "None", "32kHz", "44.1kHz", "48kHz" };
+static const char *wm8510_alc[] = { "ALC", "Limiter" };
+
+static const struct soc_enum wm8510_enum[] = {
+        SOC_ENUM_SINGLE(WM8510_COMP, 1, 4, wm8510_companding), /* adc */
+        SOC_ENUM_SINGLE(WM8510_COMP, 3, 4, wm8510_companding), /* dac */
+        SOC_ENUM_SINGLE(WM8510_DAC,  4, 4, wm8510_deemp),
+        SOC_ENUM_SINGLE(WM8510_ALC3,  8, 2, wm8510_alc),
+};
+
+static const struct snd_kcontrol_new wm8510_snd_controls[] = {
+
+SOC_SINGLE("Digital Loopback Switch", WM8510_COMP, 0, 1, 0),
+
+SOC_ENUM("DAC Companding", wm8510_enum[1]),
+SOC_ENUM("ADC Companding", wm8510_enum[0]),
+
+SOC_ENUM("Playback De-emphasis", wm8510_enum[2]),
+SOC_SINGLE("DAC Inversion Switch", WM8510_DAC, 0, 1, 0),
+
+SOC_SINGLE("Master Playback Volume", WM8510_DACVOL, 0, 127, 0),
+
+SOC_SINGLE("High Pass Filter Switch", WM8510_ADC, 8, 1, 0),
+SOC_SINGLE("High Pass Cut Off", WM8510_ADC, 4, 7, 0),
+SOC_SINGLE("ADC Inversion Switch", WM8510_COMP, 0, 1, 0),
+
+SOC_SINGLE("Capture Volume", WM8510_ADCVOL,  0, 127, 0),
+
+SOC_SINGLE("DAC Playback Limiter Switch", WM8510_DACLIM1,  8, 1, 0),
+SOC_SINGLE("DAC Playback Limiter Decay", WM8510_DACLIM1,  4, 15, 0),
+SOC_SINGLE("DAC Playback Limiter Attack", WM8510_DACLIM1,  0, 15, 0),
+
+SOC_SINGLE("DAC Playback Limiter Threshold", WM8510_DACLIM2,  4, 7, 0),
+SOC_SINGLE("DAC Playback Limiter Boost", WM8510_DACLIM2,  0, 15, 0),
+
+SOC_SINGLE("ALC Enable Switch", WM8510_ALC1,  8, 1, 0),
+SOC_SINGLE("ALC Capture Max Gain", WM8510_ALC1,  3, 7, 0),
+SOC_SINGLE("ALC Capture Min Gain", WM8510_ALC1,  0, 7, 0),
+
+SOC_SINGLE("ALC Capture ZC Switch", WM8510_ALC2,  8, 1, 0),
+SOC_SINGLE("ALC Capture Hold", WM8510_ALC2,  4, 7, 0),
+SOC_SINGLE("ALC Capture Target", WM8510_ALC2,  0, 15, 0),
+
+SOC_ENUM("ALC Capture Mode", wm8510_enum[3]),
+SOC_SINGLE("ALC Capture Decay", WM8510_ALC3,  4, 15, 0),
+SOC_SINGLE("ALC Capture Attack", WM8510_ALC3,  0, 15, 0),
+
+SOC_SINGLE("ALC Capture Noise Gate Switch", WM8510_NGATE,  3, 1, 0),
+SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8510_NGATE,  0, 7, 0),
+
+SOC_SINGLE("Capture PGA ZC Switch", WM8510_INPPGA,  7, 1, 0),
+SOC_SINGLE("Capture PGA Volume", WM8510_INPPGA,  0, 63, 0),
+
+SOC_SINGLE("Speaker Playback ZC Switch", WM8510_SPKVOL,  7, 1, 0),
+SOC_SINGLE("Speaker Playback Switch", WM8510_SPKVOL,  6, 1, 1),
+SOC_SINGLE("Speaker Playback Volume", WM8510_SPKVOL,  0, 63, 0),
+SOC_SINGLE("Speaker Boost", WM8510_OUTPUT, 2, 1, 0),
+
+SOC_SINGLE("Capture Boost(+20dB)", WM8510_ADCBOOST,  8, 1, 0),
+SOC_SINGLE("Mono Playback Switch", WM8510_MONOMIX, 6, 1, 1),
+};
+
+/* add non dapm controls */
+static int wm8510_add_controls(struct snd_soc_codec *codec)
+{
+        int err, i;
+
+        for (i = 0; i < ARRAY_SIZE(wm8510_snd_controls); i++) {
+                err = snd_ctl_add(codec->card,
+                                snd_soc_cnew(&wm8510_snd_controls[i], codec,
+                                        NULL));
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
+}
+
+/* Speaker Output Mixer */
+static const struct snd_kcontrol_new wm8510_speaker_mixer_controls[] = {
+SOC_DAPM_SINGLE("Line Bypass Switch", WM8510_SPKMIX, 1, 1, 0),
+SOC_DAPM_SINGLE("Aux Playback Switch", WM8510_SPKMIX, 5, 1, 0),
+SOC_DAPM_SINGLE("PCM Playback Switch", WM8510_SPKMIX, 0, 1, 0),
+};
+
+/* Mono Output Mixer */
+static const struct snd_kcontrol_new wm8510_mono_mixer_controls[] = {
+SOC_DAPM_SINGLE("Line Bypass Switch", WM8510_MONOMIX, 1, 1, 0),
+SOC_DAPM_SINGLE("Aux Playback Switch", WM8510_MONOMIX, 2, 1, 0),
+SOC_DAPM_SINGLE("PCM Playback Switch", WM8510_MONOMIX, 0, 1, 0),
+};
+
+static const struct snd_kcontrol_new wm8510_boost_controls[] = {
+SOC_DAPM_SINGLE("Mic PGA Switch", WM8510_INPPGA,  6, 1, 0),
+SOC_DAPM_SINGLE("Aux Volume", WM8510_ADCBOOST, 0, 7, 0),
+SOC_DAPM_SINGLE("Mic Volume", WM8510_ADCBOOST, 4, 7, 0),
+};
+
+static const struct snd_kcontrol_new wm8510_micpga_controls[] = {
+SOC_DAPM_SINGLE("MICP Switch", WM8510_INPUT, 0, 1, 0),
+SOC_DAPM_SINGLE("MICN Switch", WM8510_INPUT, 1, 1, 0),
+SOC_DAPM_SINGLE("AUX Switch", WM8510_INPUT, 2, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget wm8510_dapm_widgets[] = {
+SND_SOC_DAPM_MIXER("Speaker Mixer", WM8510_POWER3, 2, 0,
+        &wm8510_speaker_mixer_controls[0],
+        ARRAY_SIZE(wm8510_speaker_mixer_controls)),
+SND_SOC_DAPM_MIXER("Mono Mixer", WM8510_POWER3, 3, 0,
+        &wm8510_mono_mixer_controls[0],
+        ARRAY_SIZE(wm8510_mono_mixer_controls)),
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8510_POWER3, 0, 0),
+SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8510_POWER2, 0, 0),
+SND_SOC_DAPM_PGA("Aux Input", WM8510_POWER1, 6, 0, NULL, 0),
+SND_SOC_DAPM_PGA("SpkN Out", WM8510_POWER3, 5, 0, NULL, 0),
+SND_SOC_DAPM_PGA("SpkP Out", WM8510_POWER3, 6, 0, NULL, 0),
+SND_SOC_DAPM_PGA("Mono Out", WM8510_POWER3, 7, 0, NULL, 0),
+
+SND_SOC_DAPM_PGA("Mic PGA", WM8510_POWER2, 2, 0,
+                 &wm8510_micpga_controls[0],
+                 ARRAY_SIZE(wm8510_micpga_controls)),
+SND_SOC_DAPM_MIXER("Boost Mixer", WM8510_POWER2, 4, 0,
+        &wm8510_boost_controls[0],
+        ARRAY_SIZE(wm8510_boost_controls)),
+
+SND_SOC_DAPM_MICBIAS("Mic Bias", WM8510_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"},
+
+        /* Microphone PGA */
+        {"Mic PGA", "MICN Switch", "MICN"},
+        {"Mic PGA", "MICP Switch", "MICP"},
+        { "Mic PGA", "AUX Switch", "Aux Input" },
+
+        /* Boost Mixer */
+        {"Boost Mixer", "Mic PGA Switch", "Mic PGA"},
+        {"Boost Mixer", "Mic Volume", "MICP"},
+        {"Boost Mixer", "Aux Volume", "Aux Input"},
+
+        {"ADC", NULL, "Boost Mixer"},
+};
+
+static int wm8510_add_widgets(struct snd_soc_codec *codec)
+{
+        snd_soc_dapm_new_controls(codec, wm8510_dapm_widgets,
+                                  ARRAY_SIZE(wm8510_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 pre_div:4; /* prescale - 1 */
+        unsigned int n:4;
+        unsigned int k;
+};
+
+static struct pll_ pll_div;
+
+/* The size in bits of the pll divide multiplied by 10
+ * to allow rounding later */
+#define FIXED_PLL_SIZE ((1 << 24) * 10)
+
+static void pll_factors(unsigned int target, unsigned int source)
+{
+        unsigned long long Kpart;
+        unsigned int K, Ndiv, Nmod;
+
+        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))
+                printk(KERN_WARNING
+                        "WM8510 N value %d outwith recommended range!d\n",
+                        Ndiv);
+
+        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;
+}
+
+static int wm8510_set_dai_pll(struct snd_soc_codec_dai *codec_dai,
+                int pll_id, unsigned int freq_in, unsigned int freq_out)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        u16 reg;
+
+        if (freq_in == 0 || freq_out == 0) {
+                /* Clock CODEC directly from MCLK */
+                reg = wm8510_read_reg_cache(codec, WM8510_CLOCK);
+                wm8510_write(codec, WM8510_CLOCK, reg & 0x0ff);
+
+                /* Turn off PLL */
+                reg = wm8510_read_reg_cache(codec, WM8510_POWER1);
+                wm8510_write(codec, WM8510_POWER1, reg & 0x1df);
+                return 0;
+        }
+
+        pll_factors(freq_out*8, freq_in);
+
+        wm8510_write(codec, WM8510_PLLN, (pll_div.pre_div << 4) | pll_div.n);
+        wm8510_write(codec, WM8510_PLLK1, pll_div.k >> 18);
+        wm8510_write(codec, WM8510_PLLK2, (pll_div.k >> 9) & 0x1ff);
+        wm8510_write(codec, WM8510_PLLK3, pll_div.k & 0x1ff);
+        reg = wm8510_read_reg_cache(codec, WM8510_POWER1);
+        wm8510_write(codec, WM8510_POWER1, reg | 0x020);
+
+        /* Run CODEC from PLL instead of MCLK */
+        reg = wm8510_read_reg_cache(codec, WM8510_CLOCK);
+        wm8510_write(codec, WM8510_CLOCK, reg | 0x100);
+
+        return 0;
+}
+
+/*
+ * Configure WM8510 clock dividers.
+ */
+static int wm8510_set_dai_clkdiv(struct snd_soc_codec_dai *codec_dai,
+                int div_id, int div)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        u16 reg;
+
+        switch (div_id) {
+        case WM8510_OPCLKDIV:
+                reg = wm8510_read_reg_cache(codec, WM8510_GPIO) & 0x1cf;
+                wm8510_write(codec, WM8510_GPIO, reg | div);
+                break;
+        case WM8510_MCLKDIV:
+                reg = wm8510_read_reg_cache(codec, WM8510_CLOCK) & 0x1f;
+                wm8510_write(codec, WM8510_CLOCK, reg | div);
+                break;
+        case WM8510_ADCCLK:
+                reg = wm8510_read_reg_cache(codec, WM8510_ADC) & 0x1f7;
+                wm8510_write(codec, WM8510_ADC, reg | div);
+                break;
+        case WM8510_DACCLK:
+                reg = wm8510_read_reg_cache(codec, WM8510_DAC) & 0x1f7;
+                wm8510_write(codec, WM8510_DAC, reg | div);
+                break;
+        case WM8510_BCLKDIV:
+                reg = wm8510_read_reg_cache(codec, WM8510_CLOCK) & 0x1e3;
+                wm8510_write(codec, WM8510_CLOCK, reg | div);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int wm8510_set_dai_fmt(struct snd_soc_codec_dai *codec_dai,
+                unsigned int fmt)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        u16 iface = 0;
+        u16 clk = wm8510_read_reg_cache(codec, WM8510_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;
+        }
+
+        wm8510_write(codec, WM8510_IFACE, iface);
+        wm8510_write(codec, WM8510_CLOCK, clk);
+        return 0;
+}
+
+static int wm8510_pcm_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        u16 iface = wm8510_read_reg_cache(codec, WM8510_IFACE) & 0x19f;
+        u16 adn = wm8510_read_reg_cache(codec, WM8510_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:
+        case SNDRV_PCM_RATE_48000:
+                break;
+        }
+
+        wm8510_write(codec, WM8510_IFACE, iface);
+        wm8510_write(codec, WM8510_ADD, adn);
+        return 0;
+}
+
+static int wm8510_mute(struct snd_soc_codec_dai *dai, int mute)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        u16 mute_reg = wm8510_read_reg_cache(codec, WM8510_DAC) & 0xffbf;
+
+        if (mute)
+                wm8510_write(codec, WM8510_DAC, mute_reg | 0x40);
+        else
+                wm8510_write(codec, WM8510_DAC, mute_reg);
+        return 0;
+}
+
+/* liam need to make this lower power with dapm */
+static int wm8510_set_bias_level(struct snd_soc_codec *codec,
+        enum snd_soc_bias_level level)
+{
+
+        switch (level) {
+        case SND_SOC_BIAS_ON:
+                wm8510_write(codec, WM8510_POWER1, 0x1ff);
+                wm8510_write(codec, WM8510_POWER2, 0x1ff);
+                wm8510_write(codec, WM8510_POWER3, 0x1ff);
+                break;
+        case SND_SOC_BIAS_PREPARE:
+        case SND_SOC_BIAS_STANDBY:
+                break;
+        case SND_SOC_BIAS_OFF:
+                /* everything off, dac mute, inactive */
+                wm8510_write(codec, WM8510_POWER1, 0x0);
+                wm8510_write(codec, WM8510_POWER2, 0x0);
+                wm8510_write(codec, WM8510_POWER3, 0x0);
+                break;
+        }
+        codec->bias_level = level;
+        return 0;
+}
+
+#define WM8510_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 WM8510_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
+        SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+struct snd_soc_codec_dai wm8510_dai = {
+        .name = "WM8510 HiFi",
+        .playback = {
+                .stream_name = "Playback",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = WM8510_RATES,
+                .formats = WM8510_FORMATS,},
+        .capture = {
+                .stream_name = "Capture",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = WM8510_RATES,
+                .formats = WM8510_FORMATS,},
+        .ops = {
+                .hw_params = wm8510_pcm_hw_params,
+        },
+        .dai_ops = {
+                .digital_mute = wm8510_mute,
+                .set_fmt = wm8510_set_dai_fmt,
+                .set_clkdiv = wm8510_set_dai_clkdiv,
+                .set_pll = wm8510_set_dai_pll,
+        },
+};
+EXPORT_SYMBOL_GPL(wm8510_dai);
+
+static int wm8510_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec = socdev->codec;
+
+        wm8510_set_bias_level(codec, SND_SOC_BIAS_OFF);
+        return 0;
+}
+
+static int wm8510_resume(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec = socdev->codec;
+        int i;
+        u8 data[2];
+        u16 *cache = codec->reg_cache;
+
+        /* Sync reg_cache with the hardware */
+        for (i = 0; i < ARRAY_SIZE(wm8510_reg); i++) {
+                data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
+                data[1] = cache[i] & 0x00ff;
+                codec->hw_write(codec->control_data, data, 2);
+        }
+        wm8510_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+        wm8510_set_bias_level(codec, codec->suspend_bias_level);
+        return 0;
+}
+
+/*
+ * initialise the WM8510 driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int wm8510_init(struct snd_soc_device *socdev)
+{
+        struct snd_soc_codec *codec = socdev->codec;
+        int ret = 0;
+
+        codec->name = "WM8510";
+        codec->owner = THIS_MODULE;
+        codec->read = wm8510_read_reg_cache;
+        codec->write = wm8510_write;
+        codec->set_bias_level = wm8510_set_bias_level;
+        codec->dai = &wm8510_dai;
+        codec->num_dai = 1;
+        codec->reg_cache_size = ARRAY_SIZE(wm8510_reg);
+        codec->reg_cache = kmemdup(wm8510_reg, sizeof(wm8510_reg), GFP_KERNEL);
+
+        if (codec->reg_cache == NULL)
+                return -ENOMEM;
+
+        wm8510_reset(codec);
+
+        /* register pcms */
+        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+        if (ret < 0) {
+                printk(KERN_ERR "wm8510: failed to create pcms\n");
+                goto pcm_err;
+        }
+
+        /* power on device */
+        wm8510_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+        wm8510_add_controls(codec);
+        wm8510_add_widgets(codec);
+        ret = snd_soc_register_card(socdev);
+        if (ret < 0) {
+                printk(KERN_ERR "wm8510: 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 *wm8510_socdev;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+
+/*
+ * WM8510 2 wire address is 0x1a
+ */
+#define I2C_DRIVERID_WM8510 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 wm8510_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 wm8510_codec_probe(struct i2c_adapter *adap, int addr, int kind)
+{
+        struct snd_soc_device *socdev = wm8510_socdev;
+        struct wm8510_setup_data *setup = socdev->codec_data;
+        struct snd_soc_codec *codec = socdev->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) {
+                err("failed to attach codec at addr %x\n", addr);
+                goto err;
+        }
+
+        ret = wm8510_init(socdev);
+        if (ret < 0) {
+                err("failed to initialise WM8510\n");
+                goto err;
+        }
+        return ret;
+
+err:
+        kfree(codec);
+        kfree(i2c);
+        return ret;
+}
+
+static int wm8510_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 wm8510_i2c_attach(struct i2c_adapter *adap)
+{
+        return i2c_probe(adap, &addr_data, wm8510_codec_probe);
+}
+
+/* corgi i2c codec control layer */
+static struct i2c_driver wm8510_i2c_driver = {
+        .driver = {
+                .name = "WM8510 I2C Codec",
+                .owner = THIS_MODULE,
+        },
+        .id =             I2C_DRIVERID_WM8510,
+        .attach_adapter = wm8510_i2c_attach,
+        .detach_client =  wm8510_i2c_detach,
+        .command =        NULL,
+};
+
+static struct i2c_client client_template = {
+        .name =   "WM8510",
+        .driver = &wm8510_i2c_driver,
+};
+#endif
+
+static int wm8510_probe(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct wm8510_setup_data *setup;
+        struct snd_soc_codec *codec;
+        int ret = 0;
+
+        info("WM8510 Audio Codec %s", WM8510_VERSION);
+
+        setup = socdev->codec_data;
+        codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+        if (codec == NULL)
+                return -ENOMEM;
+
+        socdev->codec = codec;
+        mutex_init(&codec->mutex);
+        INIT_LIST_HEAD(&codec->dapm_widgets);
+        INIT_LIST_HEAD(&codec->dapm_paths);
+
+        wm8510_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(&wm8510_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 wm8510_remove(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec = socdev->codec;
+
+        if (codec->control_data)
+                wm8510_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(&wm8510_i2c_driver);
+#endif
+        kfree(codec);
+
+        return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_wm8510 = {
+        .probe =        wm8510_probe,
+        .remove =       wm8510_remove,
+        .suspend =      wm8510_suspend,
+        .resume =       wm8510_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_wm8510);
+
+MODULE_DESCRIPTION("ASoC WM8510 driver");
+MODULE_AUTHOR("Liam Girdwood");
+MODULE_LICENSE("GPL");