sound: ASoC codec: SSM2602 audio codec driver

[Some checkpatch fixups done by Mark Brown.]

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 776 insertions, 0 deletions

diff --git a/sound/soc/codecs/ssm2602.c b/sound/soc/codecs/ssm2602.c
new file mode 100644
index 000000000000..940ce1c3522e
--- /dev/null
+++ b/sound/soc/codecs/ssm2602.c
@@ -0,0 +1,776 @@
+/*
+ * File:         sound/soc/codecs/ssm2602.c
+ * Author:       Cliff Cai <Cliff.Cai@analog.com>
+ *
+ * Created:      Tue June 06 2008
+ * Description:  Driver for ssm2602 sound chip
+ *
+ * Modified:
+ *               Copyright 2008 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#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 "ssm2602.h"
+
+#define AUDIO_NAME "ssm2602"
+#define SSM2602_VERSION "0.1"
+
+struct snd_soc_codec_device soc_codec_dev_ssm2602;
+
+/* codec private data */
+struct ssm2602_priv {
+        unsigned int sysclk;
+        struct snd_pcm_substream *master_substream;
+        struct snd_pcm_substream *slave_substream;
+};
+
+/*
+ * ssm2602 register cache
+ * We can't read the ssm2602 register space when we are
+ * using 2 wire for device control, so we cache them instead.
+ * There is no point in caching the reset register
+ */
+static const u16 ssm2602_reg[SSM2602_CACHEREGNUM] = {
+        0x0017, 0x0017, 0x0079, 0x0079,
+        0x0000, 0x0000, 0x0000, 0x000a,
+        0x0000, 0x0000
+};
+
+/*
+ * read ssm2602 register cache
+ */
+static inline unsigned int ssm2602_read_reg_cache(struct snd_soc_codec *codec,
+        unsigned int reg)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg == SSM2602_RESET)
+                return 0;
+        if (reg >= SSM2602_CACHEREGNUM)
+                return -1;
+        return cache[reg];
+}
+
+/*
+ * write ssm2602 register cache
+ */
+static inline void ssm2602_write_reg_cache(struct snd_soc_codec *codec,
+        u16 reg, unsigned int value)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= SSM2602_CACHEREGNUM)
+                return;
+        cache[reg] = value;
+}
+
+/*
+ * write to the ssm2602 register space
+ */
+static int ssm2602_write(struct snd_soc_codec *codec, unsigned int reg,
+        unsigned int value)
+{
+        u8 data[2];
+
+        /* data is
+         *   D15..D9 ssm2602 register offset
+         *   D8...D0 register data
+         */
+        data[0] = (reg << 1) | ((value >> 8) & 0x0001);
+        data[1] = value & 0x00ff;
+
+        ssm2602_write_reg_cache(codec, reg, value);
+        if (codec->hw_write(codec->control_data, data, 2) == 2)
+                return 0;
+        else
+                return -EIO;
+}
+
+#define ssm2602_reset(c)        ssm2602_write(c, SSM2602_RESET, 0)
+
+/*Appending several "None"s just for OSS mixer use*/
+static const char *ssm2602_input_select[] = {
+        "Line", "Mic", "None", "None", "None",
+        "None", "None", "None",
+};
+
+static const char *ssm2602_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"};
+
+static const struct soc_enum ssm2602_enum[] = {
+        SOC_ENUM_SINGLE(SSM2602_APANA, 2, 2, ssm2602_input_select),
+        SOC_ENUM_SINGLE(SSM2602_APDIGI, 1, 4, ssm2602_deemph),
+};
+
+static const struct snd_kcontrol_new ssm2602_snd_controls[] = {
+
+SOC_DOUBLE_R("Master Playback Volume", SSM2602_LOUT1V, SSM2602_ROUT1V,
+        0, 127, 0),
+SOC_DOUBLE_R("Master Playback ZC Switch", SSM2602_LOUT1V, SSM2602_ROUT1V,
+        7, 1, 0),
+
+SOC_DOUBLE_R("Capture Volume", SSM2602_LINVOL, SSM2602_RINVOL, 0, 31, 0),
+SOC_DOUBLE_R("Capture Switch", SSM2602_LINVOL, SSM2602_RINVOL, 7, 1, 1),
+
+SOC_SINGLE("Mic Boost (+20dB)", SSM2602_APANA, 0, 1, 0),
+SOC_SINGLE("Mic Switch", SSM2602_APANA, 1, 1, 1),
+
+SOC_SINGLE("Sidetone Playback Volume", SSM2602_APANA, 6, 3, 1),
+
+SOC_SINGLE("ADC High Pass Filter Switch", SSM2602_APDIGI, 0, 1, 1),
+SOC_SINGLE("Store DC Offset Switch", SSM2602_APDIGI, 4, 1, 0),
+
+SOC_ENUM("Capture Source", ssm2602_enum[0]),
+
+SOC_ENUM("Playback De-emphasis", ssm2602_enum[1]),
+};
+
+/* add non dapm controls */
+static int ssm2602_add_controls(struct snd_soc_codec *codec)
+{
+        int err, i;
+
+        for (i = 0; i < ARRAY_SIZE(ssm2602_snd_controls); i++) {
+                err = snd_ctl_add(codec->card,
+                        snd_soc_cnew(&ssm2602_snd_controls[i], codec, NULL));
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
+}
+
+/* Output Mixer */
+static const struct snd_kcontrol_new ssm2602_output_mixer_controls[] = {
+SOC_DAPM_SINGLE("Line Bypass Switch", SSM2602_APANA, 3, 1, 0),
+SOC_DAPM_SINGLE("Mic Sidetone Switch", SSM2602_APANA, 5, 1, 0),
+SOC_DAPM_SINGLE("HiFi Playback Switch", SSM2602_APANA, 4, 1, 0),
+};
+
+/* Input mux */
+static const struct snd_kcontrol_new ssm2602_input_mux_controls =
+SOC_DAPM_ENUM("Input Select", ssm2602_enum[0]);
+
+static const struct snd_soc_dapm_widget ssm2602_dapm_widgets[] = {
+SND_SOC_DAPM_MIXER("Output Mixer", SSM2602_PWR, 4, 1,
+        &ssm2602_output_mixer_controls[0],
+        ARRAY_SIZE(ssm2602_output_mixer_controls)),
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SSM2602_PWR, 3, 1),
+SND_SOC_DAPM_OUTPUT("LOUT"),
+SND_SOC_DAPM_OUTPUT("LHPOUT"),
+SND_SOC_DAPM_OUTPUT("ROUT"),
+SND_SOC_DAPM_OUTPUT("RHPOUT"),
+SND_SOC_DAPM_ADC("ADC", "HiFi Capture", SSM2602_PWR, 2, 1),
+SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &ssm2602_input_mux_controls),
+SND_SOC_DAPM_PGA("Line Input", SSM2602_PWR, 0, 1, NULL, 0),
+SND_SOC_DAPM_MICBIAS("Mic Bias", SSM2602_PWR, 1, 1),
+SND_SOC_DAPM_INPUT("MICIN"),
+SND_SOC_DAPM_INPUT("RLINEIN"),
+SND_SOC_DAPM_INPUT("LLINEIN"),
+};
+
+static const struct snd_soc_dapm_route audio_conn[] = {
+        /* output mixer */
+        {"Output Mixer", "Line Bypass Switch", "Line Input"},
+        {"Output Mixer", "HiFi Playback Switch", "DAC"},
+        {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"},
+
+        /* outputs */
+        {"RHPOUT", NULL, "Output Mixer"},
+        {"ROUT", NULL, "Output Mixer"},
+        {"LHPOUT", NULL, "Output Mixer"},
+        {"LOUT", NULL, "Output Mixer"},
+
+        /* input mux */
+        {"Input Mux", "Line", "Line Input"},
+        {"Input Mux", "Mic", "Mic Bias"},
+        {"ADC", NULL, "Input Mux"},
+
+        /* inputs */
+        {"Line Input", NULL, "LLINEIN"},
+        {"Line Input", NULL, "RLINEIN"},
+        {"Mic Bias", NULL, "MICIN"},
+};
+
+static int ssm2602_add_widgets(struct snd_soc_codec *codec)
+{
+        snd_soc_dapm_new_controls(codec, ssm2602_dapm_widgets,
+                                  ARRAY_SIZE(ssm2602_dapm_widgets));
+
+        snd_soc_dapm_add_routes(codec, audio_conn, ARRAY_SIZE(audio_conn));
+
+        snd_soc_dapm_new_widgets(codec);
+        return 0;
+}
+
+struct _coeff_div {
+        u32 mclk;
+        u32 rate;
+        u16 fs;
+        u8 sr:4;
+        u8 bosr:1;
+        u8 usb:1;
+};
+
+/* codec mclk clock divider coefficients */
+static const struct _coeff_div coeff_div[] = {
+        /* 48k */
+        {12288000, 48000, 256, 0x0, 0x0, 0x0},
+        {18432000, 48000, 384, 0x0, 0x1, 0x0},
+        {12000000, 48000, 250, 0x0, 0x0, 0x1},
+
+        /* 32k */
+        {12288000, 32000, 384, 0x6, 0x0, 0x0},
+        {18432000, 32000, 576, 0x6, 0x1, 0x0},
+        {12000000, 32000, 375, 0x6, 0x0, 0x1},
+
+        /* 8k */
+        {12288000, 8000, 1536, 0x3, 0x0, 0x0},
+        {18432000, 8000, 2304, 0x3, 0x1, 0x0},
+        {11289600, 8000, 1408, 0xb, 0x0, 0x0},
+        {16934400, 8000, 2112, 0xb, 0x1, 0x0},
+        {12000000, 8000, 1500, 0x3, 0x0, 0x1},
+
+        /* 96k */
+        {12288000, 96000, 128, 0x7, 0x0, 0x0},
+        {18432000, 96000, 192, 0x7, 0x1, 0x0},
+        {12000000, 96000, 125, 0x7, 0x0, 0x1},
+
+        /* 44.1k */
+        {11289600, 44100, 256, 0x8, 0x0, 0x0},
+        {16934400, 44100, 384, 0x8, 0x1, 0x0},
+        {12000000, 44100, 272, 0x8, 0x1, 0x1},
+
+        /* 88.2k */
+        {11289600, 88200, 128, 0xf, 0x0, 0x0},
+        {16934400, 88200, 192, 0xf, 0x1, 0x0},
+        {12000000, 88200, 136, 0xf, 0x1, 0x1},
+};
+
+static inline int get_coeff(int mclk, int rate)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
+                if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
+                        return i;
+        }
+        return i;
+}
+
+static int ssm2602_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        u16 srate;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        struct ssm2602_priv *ssm2602 = codec->private_data;
+        u16 iface = ssm2602_read_reg_cache(codec, SSM2602_IFACE) & 0xfff3;
+        int i = get_coeff(ssm2602->sysclk, params_rate(params));
+
+        /*no match is found*/
+        if (i == ARRAY_SIZE(coeff_div))
+                return -EINVAL;
+
+        srate = (coeff_div[i].sr << 2) |
+                (coeff_div[i].bosr << 1) | coeff_div[i].usb;
+
+        ssm2602_write(codec, SSM2602_ACTIVE, 0);
+        ssm2602_write(codec, SSM2602_SRATE, srate);
+
+        /* 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;
+        case SNDRV_PCM_FORMAT_S32_LE:
+                iface |= 0x000c;
+                break;
+        }
+        ssm2602_write(codec, SSM2602_IFACE, iface);
+        ssm2602_write(codec, SSM2602_ACTIVE, ACTIVE_ACTIVATE_CODEC);
+        return 0;
+}
+
+static int ssm2602_startup(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        struct ssm2602_priv *ssm2602 = codec->private_data;
+        struct snd_pcm_runtime *master_runtime;
+
+        /* The DAI has shared clocks so if we already have a playback or
+         * capture going then constrain this substream to match it.
+         */
+        if (ssm2602->master_substream) {
+                master_runtime = ssm2602->master_substream->runtime;
+                snd_pcm_hw_constraint_minmax(substream->runtime,
+                                             SNDRV_PCM_HW_PARAM_RATE,
+                                             master_runtime->rate,
+                                             master_runtime->rate);
+
+                snd_pcm_hw_constraint_minmax(substream->runtime,
+                                             SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
+                                             master_runtime->sample_bits,
+                                             master_runtime->sample_bits);
+
+                ssm2602->slave_substream = substream;
+        } else
+                ssm2602->master_substream = substream;
+
+        return 0;
+}
+
+static int ssm2602_pcm_prepare(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        /* set active */
+        ssm2602_write(codec, SSM2602_ACTIVE, ACTIVE_ACTIVATE_CODEC);
+
+        return 0;
+}
+
+static void ssm2602_shutdown(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        /* deactivate */
+        if (!codec->active)
+                ssm2602_write(codec, SSM2602_ACTIVE, 0);
+}
+
+static int ssm2602_mute(struct snd_soc_dai *dai, int mute)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        u16 mute_reg = ssm2602_read_reg_cache(codec, SSM2602_APDIGI) & ~APDIGI_ENABLE_DAC_MUTE;
+        if (mute)
+                ssm2602_write(codec, SSM2602_APDIGI,
+                                mute_reg | APDIGI_ENABLE_DAC_MUTE);
+        else
+                ssm2602_write(codec, SSM2602_APDIGI, mute_reg);
+        return 0;
+}
+
+static int ssm2602_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+                int clk_id, unsigned int freq, int dir)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        struct ssm2602_priv *ssm2602 = codec->private_data;
+        switch (freq) {
+        case 11289600:
+        case 12000000:
+        case 12288000:
+        case 16934400:
+        case 18432000:
+                ssm2602->sysclk = freq;
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static int ssm2602_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 */
+        ssm2602_write(codec, SSM2602_IFACE, iface);
+        return 0;
+}
+
+static int ssm2602_set_bias_level(struct snd_soc_codec *codec,
+                                 enum snd_soc_bias_level level)
+{
+        u16 reg = ssm2602_read_reg_cache(codec, SSM2602_PWR) & 0xff7f;
+
+        switch (level) {
+        case SND_SOC_BIAS_ON:
+                /* vref/mid, osc on, dac unmute */
+                ssm2602_write(codec, SSM2602_PWR, reg);
+                break;
+        case SND_SOC_BIAS_PREPARE:
+                break;
+        case SND_SOC_BIAS_STANDBY:
+                /* everything off except vref/vmid, */
+                ssm2602_write(codec, SSM2602_PWR, reg | PWR_CLK_OUT_PDN);
+                break;
+        case SND_SOC_BIAS_OFF:
+                /* everything off, dac mute, inactive */
+                ssm2602_write(codec, SSM2602_ACTIVE, 0);
+                ssm2602_write(codec, SSM2602_PWR, 0xffff);
+                break;
+
+        }
+        codec->bias_level = level;
+        return 0;
+}
+
+#define SSM2602_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
+                SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
+                SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
+                SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
+                SNDRV_PCM_RATE_96000)
+
+struct snd_soc_dai ssm2602_dai = {
+        .name = "SSM2602",
+        .playback = {
+                .stream_name = "Playback",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SSM2602_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S32_LE,},
+        .capture = {
+                .stream_name = "Capture",
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SSM2602_RATES,
+                .formats = SNDRV_PCM_FMTBIT_S32_LE,},
+        .ops = {
+                .startup = ssm2602_startup,
+                .prepare = ssm2602_pcm_prepare,
+                .hw_params = ssm2602_hw_params,
+                .shutdown = ssm2602_shutdown,
+        },
+        .dai_ops = {
+                .digital_mute = ssm2602_mute,
+                .set_sysclk = ssm2602_set_dai_sysclk,
+                .set_fmt = ssm2602_set_dai_fmt,
+        }
+};
+EXPORT_SYMBOL_GPL(ssm2602_dai);
+
+static int ssm2602_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;
+
+        ssm2602_set_bias_level(codec, SND_SOC_BIAS_OFF);
+        return 0;
+}
+
+static int ssm2602_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(ssm2602_reg); i++) {
+                data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
+                data[1] = cache[i] & 0x00ff;
+                codec->hw_write(codec->control_data, data, 2);
+        }
+        ssm2602_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+        ssm2602_set_bias_level(codec, codec->suspend_bias_level);
+        return 0;
+}
+
+/*
+ * initialise the ssm2602 driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int ssm2602_init(struct snd_soc_device *socdev)
+{
+        struct snd_soc_codec *codec = socdev->codec;
+        int reg, ret = 0;
+
+        codec->name = "SSM2602";
+        codec->owner = THIS_MODULE;
+        codec->read = ssm2602_read_reg_cache;
+        codec->write = ssm2602_write;
+        codec->set_bias_level = ssm2602_set_bias_level;
+        codec->dai = &ssm2602_dai;
+        codec->num_dai = 1;
+        codec->reg_cache_size = sizeof(ssm2602_reg);
+        codec->reg_cache = kmemdup(ssm2602_reg, sizeof(ssm2602_reg),
+                                        GFP_KERNEL);
+        if (codec->reg_cache == NULL)
+                return -ENOMEM;
+
+        ssm2602_reset(codec);
+
+        /* register pcms */
+        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+        if (ret < 0) {
+                pr_err("ssm2602: failed to create pcms\n");
+                goto pcm_err;
+        }
+        /*power on device*/
+        ssm2602_write(codec, SSM2602_ACTIVE, 0);
+        /* set the update bits */
+        reg = ssm2602_read_reg_cache(codec, SSM2602_LINVOL);
+        ssm2602_write(codec, SSM2602_LINVOL, reg | LINVOL_LRIN_BOTH);
+        reg = ssm2602_read_reg_cache(codec, SSM2602_RINVOL);
+        ssm2602_write(codec, SSM2602_RINVOL, reg | RINVOL_RLIN_BOTH);
+        reg = ssm2602_read_reg_cache(codec, SSM2602_LOUT1V);
+        ssm2602_write(codec, SSM2602_LOUT1V, reg | LOUT1V_LRHP_BOTH);
+        reg = ssm2602_read_reg_cache(codec, SSM2602_ROUT1V);
+        ssm2602_write(codec, SSM2602_ROUT1V, reg | ROUT1V_RLHP_BOTH);
+        /*select Line in as default input*/
+        ssm2602_write(codec, SSM2602_APANA,
+                        APANA_ENABLE_MIC_BOOST2 | APANA_SELECT_DAC |
+                        APANA_ENABLE_MIC_BOOST);
+        ssm2602_write(codec, SSM2602_PWR, 0);
+
+        ssm2602_add_controls(codec);
+        ssm2602_add_widgets(codec);
+        ret = snd_soc_register_card(socdev);
+        if (ret < 0) {
+                pr_err("ssm2602: 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 *ssm2602_socdev;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+/*
+ * ssm2602 2 wire address is determined by GPIO5
+ * state during powerup.
+ *    low  = 0x1a
+ *    high = 0x1b
+ */
+static int ssm2602_i2c_probe(struct i2c_client *i2c,
+                             const struct i2c_device_id *id)
+{
+        struct snd_soc_device *socdev = ssm2602_socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        int ret;
+
+        i2c_set_clientdata(i2c, codec);
+        codec->control_data = i2c;
+
+        ret = ssm2602_init(socdev);
+        if (ret < 0)
+                pr_err("failed to initialise SSM2602\n");
+
+        return ret;
+}
+
+static int ssm2602_i2c_remove(struct i2c_client *client)
+{
+        struct snd_soc_codec *codec = i2c_get_clientdata(client);
+        kfree(codec->reg_cache);
+        return 0;
+}
+
+static const struct i2c_device_id ssm2602_i2c_id[] = {
+        { "ssm2602", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, ssm2602_i2c_id);
+/* corgi i2c codec control layer */
+static struct i2c_driver ssm2602_i2c_driver = {
+        .driver = {
+                .name = "SSM2602 I2C Codec",
+                .owner = THIS_MODULE,
+        },
+        .probe = ssm2602_i2c_probe,
+        .remove = ssm2602_i2c_remove,
+        .id_table = ssm2602_i2c_id,
+};
+
+static int ssm2602_add_i2c_device(struct platform_device *pdev,
+                                  const struct ssm2602_setup_data *setup)
+{
+        struct i2c_board_info info;
+        struct i2c_adapter *adapter;
+        struct i2c_client *client;
+        int ret;
+
+        ret = i2c_add_driver(&ssm2602_i2c_driver);
+        if (ret != 0) {
+                dev_err(&pdev->dev, "can't add i2c driver\n");
+                return ret;
+        }
+        memset(&info, 0, sizeof(struct i2c_board_info));
+        info.addr = setup->i2c_address;
+        strlcpy(info.type, "ssm2602", I2C_NAME_SIZE);
+        adapter = i2c_get_adapter(setup->i2c_bus);
+        if (!adapter) {
+                dev_err(&pdev->dev, "can't get i2c adapter %d\n",
+                setup->i2c_bus);
+                goto err_driver;
+        }
+        client = i2c_new_device(adapter, &info);
+        i2c_put_adapter(adapter);
+        if (!client) {
+                dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
+                (unsigned int)info.addr);
+                goto err_driver;
+        }
+        return 0;
+err_driver:
+        i2c_del_driver(&ssm2602_i2c_driver);
+        return -ENODEV;
+}
+#endif
+
+static int ssm2602_probe(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct ssm2602_setup_data *setup;
+        struct snd_soc_codec *codec;
+        struct ssm2602_priv *ssm2602;
+        int ret = 0;
+
+        pr_info("ssm2602 Audio Codec %s", SSM2602_VERSION);
+
+        setup = socdev->codec_data;
+        codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+        if (codec == NULL)
+                return -ENOMEM;
+
+        ssm2602 = kzalloc(sizeof(struct ssm2602_priv), GFP_KERNEL);
+        if (ssm2602 == NULL) {
+                kfree(codec);
+                return -ENOMEM;
+        }
+
+        codec->private_data = ssm2602;
+        socdev->codec = codec;
+        mutex_init(&codec->mutex);
+        INIT_LIST_HEAD(&codec->dapm_widgets);
+        INIT_LIST_HEAD(&codec->dapm_paths);
+
+        ssm2602_socdev = socdev;
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+        if (setup->i2c_address) {
+                codec->hw_write = (hw_write_t)i2c_master_send;
+                ret = ssm2602_add_i2c_device(pdev, setup);
+        }
+#else
+        /* other interfaces */
+#endif
+        return ret;
+}
+
+/* remove everything here */
+static int ssm2602_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)
+                ssm2602_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_unregister_device(codec->control_data);
+        i2c_del_driver(&ssm2602_i2c_driver);
+#endif
+        kfree(codec->private_data);
+        kfree(codec);
+
+        return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_ssm2602 = {
+        .probe =        ssm2602_probe,
+        .remove =       ssm2602_remove,
+        .suspend =      ssm2602_suspend,
+        .resume =       ssm2602_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_ssm2602);
+
+MODULE_DESCRIPTION("ASoC ssm2602 driver");
+MODULE_AUTHOR("Cliff Cai");
+MODULE_LICENSE("GPL");