Merge branch 'topic/asoc' into for-linus

1 files changed, 706 insertions, 0 deletions

diff --git a/sound/soc/samsung/neo1973_wm8753.c b/sound/soc/samsung/neo1973_wm8753.c
new file mode 100644
index 000000000000..c7a24514beb5
--- /dev/null
+++ b/sound/soc/samsung/neo1973_wm8753.c
@@ -0,0 +1,706 @@
+/*
+ * neo1973_wm8753.c  --  SoC audio for Neo1973
+ *
+ * Copyright 2007 Wolfson Microelectronics PLC.
+ * Author: Graeme Gregory
+ *         graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#include <asm/mach-types.h>
+#include <asm/hardware/scoop.h>
+#include <mach/regs-clock.h>
+#include <mach/regs-gpio.h>
+#include <mach/hardware.h>
+#include <linux/io.h>
+#include <mach/spi-gpio.h>
+
+#include <plat/regs-iis.h>
+
+#include "../codecs/wm8753.h"
+#include "lm4857.h"
+#include "dma.h"
+#include "s3c24xx-i2s.h"
+
+/* define the scenarios */
+#define NEO_AUDIO_OFF                   0
+#define NEO_GSM_CALL_AUDIO_HANDSET      1
+#define NEO_GSM_CALL_AUDIO_HEADSET      2
+#define NEO_GSM_CALL_AUDIO_BLUETOOTH    3
+#define NEO_STEREO_TO_SPEAKERS          4
+#define NEO_STEREO_TO_HEADPHONES        5
+#define NEO_CAPTURE_HANDSET             6
+#define NEO_CAPTURE_HEADSET             7
+#define NEO_CAPTURE_BLUETOOTH           8
+
+static struct snd_soc_card neo1973;
+static struct i2c_client *i2c;
+
+static int neo1973_hifi_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_dai *codec_dai = rtd->codec_dai;
+        struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+        unsigned int pll_out = 0, bclk = 0;
+        int ret = 0;
+        unsigned long iis_clkrate;
+
+        pr_debug("Entered %s\n", __func__);
+
+        iis_clkrate = s3c24xx_i2s_get_clockrate();
+
+        switch (params_rate(params)) {
+        case 8000:
+        case 16000:
+                pll_out = 12288000;
+                break;
+        case 48000:
+                bclk = WM8753_BCLK_DIV_4;
+                pll_out = 12288000;
+                break;
+        case 96000:
+                bclk = WM8753_BCLK_DIV_2;
+                pll_out = 12288000;
+                break;
+        case 11025:
+                bclk = WM8753_BCLK_DIV_16;
+                pll_out = 11289600;
+                break;
+        case 22050:
+                bclk = WM8753_BCLK_DIV_8;
+                pll_out = 11289600;
+                break;
+        case 44100:
+                bclk = WM8753_BCLK_DIV_4;
+                pll_out = 11289600;
+                break;
+        case 88200:
+                bclk = WM8753_BCLK_DIV_2;
+                pll_out = 11289600;
+                break;
+        }
+
+        /* set codec DAI configuration */
+        ret = snd_soc_dai_set_fmt(codec_dai,
+                SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+                SND_SOC_DAIFMT_CBM_CFM);
+        if (ret < 0)
+                return ret;
+
+        /* set cpu DAI configuration */
+        ret = snd_soc_dai_set_fmt(cpu_dai,
+                SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+                SND_SOC_DAIFMT_CBM_CFM);
+        if (ret < 0)
+                return ret;
+
+        /* set the codec system clock for DAC and ADC */
+        ret = snd_soc_dai_set_sysclk(codec_dai, WM8753_MCLK, pll_out,
+                SND_SOC_CLOCK_IN);
+        if (ret < 0)
+                return ret;
+
+        /* set MCLK division for sample rate */
+        ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK,
+                S3C2410_IISMOD_32FS);
+        if (ret < 0)
+                return ret;
+
+        /* set codec BCLK division for sample rate */
+        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8753_BCLKDIV, bclk);
+        if (ret < 0)
+                return ret;
+
+        /* set prescaler division for sample rate */
+        ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER,
+                S3C24XX_PRESCALE(4, 4));
+        if (ret < 0)
+                return ret;
+
+        /* codec PLL input is PCLK/4 */
+        ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0,
+                iis_clkrate / 4, pll_out);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int neo1973_hifi_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+        pr_debug("Entered %s\n", __func__);
+
+        /* disable the PLL */
+        return snd_soc_dai_set_pll(codec_dai, WM8753_PLL1, 0, 0, 0);
+}
+
+/*
+ * Neo1973 WM8753 HiFi DAI opserations.
+ */
+static struct snd_soc_ops neo1973_hifi_ops = {
+        .hw_params = neo1973_hifi_hw_params,
+        .hw_free = neo1973_hifi_hw_free,
+};
+
+static int neo1973_voice_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_dai *codec_dai = rtd->codec_dai;
+        unsigned int pcmdiv = 0;
+        int ret = 0;
+        unsigned long iis_clkrate;
+
+        pr_debug("Entered %s\n", __func__);
+
+        iis_clkrate = s3c24xx_i2s_get_clockrate();
+
+        if (params_rate(params) != 8000)
+                return -EINVAL;
+        if (params_channels(params) != 1)
+                return -EINVAL;
+
+        pcmdiv = WM8753_PCM_DIV_6; /* 2.048 MHz */
+
+        /* todo: gg check mode (DSP_B) against CSR datasheet */
+        /* set codec DAI configuration */
+        ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_DSP_B |
+                SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
+        if (ret < 0)
+                return ret;
+
+        /* set the codec system clock for DAC and ADC */
+        ret = snd_soc_dai_set_sysclk(codec_dai, WM8753_PCMCLK, 12288000,
+                SND_SOC_CLOCK_IN);
+        if (ret < 0)
+                return ret;
+
+        /* set codec PCM division for sample rate */
+        ret = snd_soc_dai_set_clkdiv(codec_dai, WM8753_PCMDIV, pcmdiv);
+        if (ret < 0)
+                return ret;
+
+        /* configure and enable PLL for 12.288MHz output */
+        ret = snd_soc_dai_set_pll(codec_dai, WM8753_PLL2, 0,
+                iis_clkrate / 4, 12288000);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int neo1973_voice_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+        pr_debug("Entered %s\n", __func__);
+
+        /* disable the PLL */
+        return snd_soc_dai_set_pll(codec_dai, WM8753_PLL2, 0, 0, 0);
+}
+
+static struct snd_soc_ops neo1973_voice_ops = {
+        .hw_params = neo1973_voice_hw_params,
+        .hw_free = neo1973_voice_hw_free,
+};
+
+static int neo1973_scenario;
+
+static int neo1973_get_scenario(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        ucontrol->value.integer.value[0] = neo1973_scenario;
+        return 0;
+}
+
+static int set_scenario_endpoints(struct snd_soc_codec *codec, int scenario)
+{
+        struct snd_soc_dapm_context *dapm = &codec->dapm;
+
+        pr_debug("Entered %s\n", __func__);
+
+        switch (neo1973_scenario) {
+        case NEO_AUDIO_OFF:
+                snd_soc_dapm_disable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        case NEO_GSM_CALL_AUDIO_HANDSET:
+                snd_soc_dapm_enable_pin(dapm, "Audio Out");
+                snd_soc_dapm_enable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_enable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_enable_pin(dapm, "Call Mic");
+                break;
+        case NEO_GSM_CALL_AUDIO_HEADSET:
+                snd_soc_dapm_enable_pin(dapm, "Audio Out");
+                snd_soc_dapm_enable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_enable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_enable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        case NEO_GSM_CALL_AUDIO_BLUETOOTH:
+                snd_soc_dapm_disable_pin(dapm, "Audio Out");
+                snd_soc_dapm_enable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_enable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        case NEO_STEREO_TO_SPEAKERS:
+                snd_soc_dapm_enable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        case NEO_STEREO_TO_HEADPHONES:
+                snd_soc_dapm_enable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        case NEO_CAPTURE_HANDSET:
+                snd_soc_dapm_disable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_enable_pin(dapm, "Call Mic");
+                break;
+        case NEO_CAPTURE_HEADSET:
+                snd_soc_dapm_disable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_enable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        case NEO_CAPTURE_BLUETOOTH:
+                snd_soc_dapm_disable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+                break;
+        default:
+                snd_soc_dapm_disable_pin(dapm, "Audio Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line Out");
+                snd_soc_dapm_disable_pin(dapm, "GSM Line In");
+                snd_soc_dapm_disable_pin(dapm, "Headset Mic");
+                snd_soc_dapm_disable_pin(dapm, "Call Mic");
+        }
+
+        snd_soc_dapm_sync(dapm);
+
+        return 0;
+}
+
+static int neo1973_set_scenario(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+
+        pr_debug("Entered %s\n", __func__);
+
+        if (neo1973_scenario == ucontrol->value.integer.value[0])
+                return 0;
+
+        neo1973_scenario = ucontrol->value.integer.value[0];
+        set_scenario_endpoints(codec, neo1973_scenario);
+        return 1;
+}
+
+static u8 lm4857_regs[4] = {0x00, 0x40, 0x80, 0xC0};
+
+static void lm4857_write_regs(void)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        if (i2c_master_send(i2c, lm4857_regs, 4) != 4)
+                printk(KERN_ERR "lm4857: i2c write failed\n");
+}
+
+static int lm4857_get_reg(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct soc_mixer_control *mc =
+                (struct soc_mixer_control *)kcontrol->private_value;
+        int reg = mc->reg;
+        int shift = mc->shift;
+        int mask = mc->max;
+
+        pr_debug("Entered %s\n", __func__);
+
+        ucontrol->value.integer.value[0] = (lm4857_regs[reg] >> shift) & mask;
+        return 0;
+}
+
+static int lm4857_set_reg(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct soc_mixer_control *mc =
+                (struct soc_mixer_control *)kcontrol->private_value;
+        int reg = mc->reg;
+        int shift = mc->shift;
+        int mask = mc->max;
+
+        if (((lm4857_regs[reg] >> shift) & mask) ==
+                ucontrol->value.integer.value[0])
+                return 0;
+
+        lm4857_regs[reg] &= ~(mask << shift);
+        lm4857_regs[reg] |= ucontrol->value.integer.value[0] << shift;
+        lm4857_write_regs();
+        return 1;
+}
+
+static int lm4857_get_mode(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        u8 value = lm4857_regs[LM4857_CTRL] & 0x0F;
+
+        pr_debug("Entered %s\n", __func__);
+
+        if (value)
+                value -= 5;
+
+        ucontrol->value.integer.value[0] = value;
+        return 0;
+}
+
+static int lm4857_set_mode(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        u8 value = ucontrol->value.integer.value[0];
+
+        pr_debug("Entered %s\n", __func__);
+
+        if (value)
+                value += 5;
+
+        if ((lm4857_regs[LM4857_CTRL] & 0x0F) == value)
+                return 0;
+
+        lm4857_regs[LM4857_CTRL] &= 0xF0;
+        lm4857_regs[LM4857_CTRL] |= value;
+        lm4857_write_regs();
+        return 1;
+}
+
+static const struct snd_soc_dapm_widget wm8753_dapm_widgets[] = {
+        SND_SOC_DAPM_LINE("Audio Out", NULL),
+        SND_SOC_DAPM_LINE("GSM Line Out", NULL),
+        SND_SOC_DAPM_LINE("GSM Line In", NULL),
+        SND_SOC_DAPM_MIC("Headset Mic", NULL),
+        SND_SOC_DAPM_MIC("Call Mic", NULL),
+};
+
+
+static const struct snd_soc_dapm_route dapm_routes[] = {
+
+        /* Connections to the lm4857 amp */
+        {"Audio Out", NULL, "LOUT1"},
+        {"Audio Out", NULL, "ROUT1"},
+
+        /* Connections to the GSM Module */
+        {"GSM Line Out", NULL, "MONO1"},
+        {"GSM Line Out", NULL, "MONO2"},
+        {"RXP", NULL, "GSM Line In"},
+        {"RXN", NULL, "GSM Line In"},
+
+        /* Connections to Headset */
+        {"MIC1", NULL, "Mic Bias"},
+        {"Mic Bias", NULL, "Headset Mic"},
+
+        /* Call Mic */
+        {"MIC2", NULL, "Mic Bias"},
+        {"MIC2N", NULL, "Mic Bias"},
+        {"Mic Bias", NULL, "Call Mic"},
+
+        /* Connect the ALC pins */
+        {"ACIN", NULL, "ACOP"},
+};
+
+static const char *lm4857_mode[] = {
+        "Off",
+        "Call Speaker",
+        "Stereo Speakers",
+        "Stereo Speakers + Headphones",
+        "Headphones"
+};
+
+static const struct soc_enum lm4857_mode_enum[] = {
+        SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode),
+};
+
+static const char *neo_scenarios[] = {
+        "Off",
+        "GSM Handset",
+        "GSM Headset",
+        "GSM Bluetooth",
+        "Speakers",
+        "Headphones",
+        "Capture Handset",
+        "Capture Headset",
+        "Capture Bluetooth"
+};
+
+static const struct soc_enum neo_scenario_enum[] = {
+        SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(neo_scenarios), neo_scenarios),
+};
+
+static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0);
+static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0);
+
+static const struct snd_kcontrol_new wm8753_neo1973_controls[] = {
+        SOC_SINGLE_EXT_TLV("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0,
+                lm4857_get_reg, lm4857_set_reg, stereo_tlv),
+        SOC_SINGLE_EXT_TLV("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0,
+                lm4857_get_reg, lm4857_set_reg, stereo_tlv),
+        SOC_SINGLE_EXT_TLV("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0,
+                lm4857_get_reg, lm4857_set_reg, mono_tlv),
+        SOC_ENUM_EXT("Amp Mode", lm4857_mode_enum[0],
+                lm4857_get_mode, lm4857_set_mode),
+        SOC_ENUM_EXT("Neo Mode", neo_scenario_enum[0],
+                neo1973_get_scenario, neo1973_set_scenario),
+        SOC_SINGLE_EXT("Amp Spk 3D Playback Switch", LM4857_LVOL, 5, 1, 0,
+                lm4857_get_reg, lm4857_set_reg),
+        SOC_SINGLE_EXT("Amp HP 3d Playback Switch", LM4857_RVOL, 5, 1, 0,
+                lm4857_get_reg, lm4857_set_reg),
+        SOC_SINGLE_EXT("Amp Fast Wakeup Playback Switch", LM4857_CTRL, 5, 1, 0,
+                lm4857_get_reg, lm4857_set_reg),
+        SOC_SINGLE_EXT("Amp Earpiece 6dB Playback Switch", LM4857_CTRL, 4, 1, 0,
+                lm4857_get_reg, lm4857_set_reg),
+};
+
+/*
+ * This is an example machine initialisation for a wm8753 connected to a
+ * neo1973 II. It is missing logic to detect hp/mic insertions and logic
+ * to re-route the audio in such an event.
+ */
+static int neo1973_wm8753_init(struct snd_soc_pcm_runtime *rtd)
+{
+        struct snd_soc_codec *codec = rtd->codec;
+        struct snd_soc_dapm_context *dapm = &codec->dapm;
+        int err;
+
+        pr_debug("Entered %s\n", __func__);
+
+        /* set up NC codec pins */
+        snd_soc_dapm_nc_pin(dapm, "LOUT2");
+        snd_soc_dapm_nc_pin(dapm, "ROUT2");
+        snd_soc_dapm_nc_pin(dapm, "OUT3");
+        snd_soc_dapm_nc_pin(dapm, "OUT4");
+        snd_soc_dapm_nc_pin(dapm, "LINE1");
+        snd_soc_dapm_nc_pin(dapm, "LINE2");
+
+        /* Add neo1973 specific widgets */
+        snd_soc_dapm_new_controls(dapm, wm8753_dapm_widgets,
+                                  ARRAY_SIZE(wm8753_dapm_widgets));
+
+        /* set endpoints to default mode */
+        set_scenario_endpoints(codec, NEO_AUDIO_OFF);
+
+        /* add neo1973 specific controls */
+        err = snd_soc_add_controls(codec, wm8753_neo1973_controls,
+                                ARRAY_SIZE(8753_neo1973_controls));
+        if (err < 0)
+                return err;
+
+        /* set up neo1973 specific audio routes */
+        err = snd_soc_dapm_add_routes(dapm, dapm_routes,
+                                      ARRAY_SIZE(dapm_routes));
+
+        snd_soc_dapm_sync(dapm);
+        return 0;
+}
+
+/*
+ * BT Codec DAI
+ */
+static struct snd_soc_dai bt_dai = {
+        .name = "bluetooth-dai",
+        .playback = {
+                .channels_min = 1,
+                .channels_max = 1,
+                .rates = SNDRV_PCM_RATE_8000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .capture = {
+                .channels_min = 1,
+                .channels_max = 1,
+                .rates = SNDRV_PCM_RATE_8000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+};
+
+static struct snd_soc_dai_link neo1973_dai[] = {
+{ /* Hifi Playback - for similatious use with voice below */
+        .name = "WM8753",
+        .stream_name = "WM8753 HiFi",
+        .platform_name = "samsung-audio",
+        .cpu_dai_name = "s3c24xx-i2s",
+        .codec_dai_name = "wm8753-hifi",
+        .codec_name = "wm8753-codec.0-0x1a",
+        .init = neo1973_wm8753_init,
+        .ops = &neo1973_hifi_ops,
+},
+{ /* Voice via BT */
+        .name = "Bluetooth",
+        .stream_name = "Voice",
+        .platform_name = "samsung-audio",
+        .cpu_dai_name = "bluetooth-dai",
+        .codec_dai_name = "wm8753-voice",
+        .codec_name = "wm8753-codec.0-0x1a",
+        .ops = &neo1973_voice_ops,
+},
+};
+
+static struct snd_soc_card neo1973 = {
+        .name = "neo1973",
+        .dai_link = neo1973_dai,
+        .num_links = ARRAY_SIZE(neo1973_dai),
+};
+
+static int lm4857_i2c_probe(struct i2c_client *client,
+                            const struct i2c_device_id *id)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        i2c = client;
+
+        lm4857_write_regs();
+        return 0;
+}
+
+static int lm4857_i2c_remove(struct i2c_client *client)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        i2c = NULL;
+
+        return 0;
+}
+
+static u8 lm4857_state;
+
+static int lm4857_suspend(struct i2c_client *dev, pm_message_t state)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        dev_dbg(&dev->dev, "lm4857_suspend\n");
+        lm4857_state = lm4857_regs[LM4857_CTRL] & 0xf;
+        if (lm4857_state) {
+                lm4857_regs[LM4857_CTRL] &= 0xf0;
+                lm4857_write_regs();
+        }
+        return 0;
+}
+
+static int lm4857_resume(struct i2c_client *dev)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        if (lm4857_state) {
+                lm4857_regs[LM4857_CTRL] |= (lm4857_state & 0x0f);
+                lm4857_write_regs();
+        }
+        return 0;
+}
+
+static void lm4857_shutdown(struct i2c_client *dev)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        dev_dbg(&dev->dev, "lm4857_shutdown\n");
+        lm4857_regs[LM4857_CTRL] &= 0xf0;
+        lm4857_write_regs();
+}
+
+static const struct i2c_device_id lm4857_i2c_id[] = {
+        { "neo1973_lm4857", 0 },
+        { }
+};
+
+static struct i2c_driver lm4857_i2c_driver = {
+        .driver = {
+                .name = "LM4857 I2C Amp",
+                .owner = THIS_MODULE,
+        },
+        .suspend =        lm4857_suspend,
+        .resume =         lm4857_resume,
+        .shutdown =       lm4857_shutdown,
+        .probe =          lm4857_i2c_probe,
+        .remove =         lm4857_i2c_remove,
+        .id_table =       lm4857_i2c_id,
+};
+
+static struct platform_device *neo1973_snd_device;
+
+static int __init neo1973_init(void)
+{
+        int ret;
+
+        pr_debug("Entered %s\n", __func__);
+
+        if (!machine_is_neo1973_gta01()) {
+                printk(KERN_INFO
+                        "Only GTA01 hardware supported by ASoC driver\n");
+                return -ENODEV;
+        }
+
+        neo1973_snd_device = platform_device_alloc("soc-audio", -1);
+        if (!neo1973_snd_device)
+                return -ENOMEM;
+
+        platform_set_drvdata(neo1973_snd_device, &neo1973);
+        ret = platform_device_add(neo1973_snd_device);
+
+        if (ret) {
+                platform_device_put(neo1973_snd_device);
+                return ret;
+        }
+
+        ret = i2c_add_driver(&lm4857_i2c_driver);
+
+        if (ret != 0)
+                platform_device_unregister(neo1973_snd_device);
+
+        return ret;
+}
+
+static void __exit neo1973_exit(void)
+{
+        pr_debug("Entered %s\n", __func__);
+
+        i2c_del_driver(&lm4857_i2c_driver);
+        platform_device_unregister(neo1973_snd_device);
+}
+
+module_init(neo1973_init);
+module_exit(neo1973_exit);
+
+/* Module information */
+MODULE_AUTHOR("Graeme Gregory, graeme@openmoko.org, www.openmoko.org");
+MODULE_DESCRIPTION("ALSA SoC WM8753 Neo1973");
+MODULE_LICENSE("GPL");