ALSA: ASoC: Add TLV320AIC23 codec driver

ASoC codec driver for TLV320AIC23 device

Signed-off-by: Arun KS <arunks@mistralsolutions.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 670 insertions, 0 deletions

diff --git a/sound/soc/codecs/tlv320aic23.c b/sound/soc/codecs/tlv320aic23.c
new file mode 100644
index 000000000000..c2d35e9de335
--- /dev/null
+++ b/sound/soc/codecs/tlv320aic23.c
@@ -0,0 +1,670 @@
+/*
+ * ALSA SoC TLV320AIC23 codec driver
+ *
+ * Author:      Arun KS, <arunks@mistralsolutions.com>
+ * Copyright:   (C) 2008 Mistral Solutions Pvt Ltd.,
+ *
+ * Based on sound/soc/codecs/wm8731.c by Richard Purdie
+ *
+ * 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.
+ *
+ * Notes:
+ *  The AIC23 is a driver for a low power stereo audio
+ *  codec tlv320aic23
+ *
+ *  The machine layer should disable unsupported inputs/outputs by
+ *  snd_soc_dapm_disable_pin(codec, "LHPOUT"), etc.
+ */
+
+#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/tlv.h>
+#include <sound/initval.h>
+
+#include "tlv320aic23.h"
+
+#define AUDIO_NAME "tlv320aic23"
+#define AIC23_VERSION "0.1"
+
+struct tlv320aic23_srate_reg_info {
+        u32 sample_rate;
+        u8 control;             /* SR3, SR2, SR1, SR0 and BOSR */
+        u8 divider;             /* if 0 CLKIN = MCLK, if 1 CLKIN = MCLK/2 */
+};
+
+/*
+ * AIC23 register cache
+ */
+static const u16 tlv320aic23_reg[] = {
+        0x0097, 0x0097, 0x00F9, 0x00F9, /* 0 */
+        0x001A, 0x0004, 0x0007, 0x0001, /* 4 */
+        0x0020, 0x0000, 0x0000, 0x0000, /* 8 */
+        0x0000, 0x0000, 0x0000, 0x0000, /* 12 */
+};
+
+/*
+ * read tlv320aic23 register cache
+ */
+static inline unsigned int tlv320aic23_read_reg_cache(struct snd_soc_codec
+                                                      *codec, unsigned int reg)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= ARRAY_SIZE(tlv320aic23_reg))
+                return -1;
+        return cache[reg];
+}
+
+/*
+ * write tlv320aic23 register cache
+ */
+static inline void tlv320aic23_write_reg_cache(struct snd_soc_codec *codec,
+                                               u8 reg, u16 value)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= ARRAY_SIZE(tlv320aic23_reg))
+                return;
+        cache[reg] = value;
+}
+
+/*
+ * write to the tlv320aic23 register space
+ */
+static int tlv320aic23_write(struct snd_soc_codec *codec, unsigned int reg,
+                             unsigned int value)
+{
+
+        u8 data;
+
+        /* TLV320AIC23 has 7 bit address and 9 bits of data
+         * so we need to switch one data bit into reg and rest
+         * of data into val
+         */
+
+        if ((reg < 0 || reg > 9) && (reg != 15)) {
+                printk(KERN_WARNING "%s Invalid register R%d\n", __func__, reg);
+                return -1;
+        }
+
+        data = (reg << 1) | (value >> 8 & 0x01);
+
+        tlv320aic23_write_reg_cache(codec, reg, value);
+
+        if (codec->hw_write(codec->control_data, data,
+                            (value & 0xff)) == 0)
+                return 0;
+
+        printk(KERN_ERR "%s cannot write %03x to register R%d\n", __func__,
+               value, reg);
+
+        return -EIO;
+}
+
+static const char *rec_src_text[] = { "Line", "Mic" };
+static const char *deemph_text[] = {"None", "32Khz", "44.1Khz", "48Khz"};
+static const char *sidetone_text[] = {"-6db", "-9db", "-12db", "-18db", "0db"};
+
+static const struct soc_enum rec_src_enum =
+        SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 2, 2, rec_src_text);
+
+static const struct snd_kcontrol_new tlv320aic23_rec_src_mux_controls =
+SOC_DAPM_ENUM("Input Select", rec_src_enum);
+
+static const struct soc_enum tlv320aic23_rec_src =
+        SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 2, 2, rec_src_text);
+static const struct soc_enum tlv320aic23_deemph =
+        SOC_ENUM_SINGLE(TLV320AIC23_DIGT, 1, 4, deemph_text);
+static const struct soc_enum tlv320aic23_sidetone =
+        SOC_ENUM_SINGLE(TLV320AIC23_ANLG, 6, 5, sidetone_text);
+
+static const DECLARE_TLV_DB_SCALE(out_gain_tlv, -12100, 100, 0);
+static const DECLARE_TLV_DB_SCALE(input_gain_tlv, -1725, 75, 0);
+
+static const struct snd_kcontrol_new tlv320aic23_snd_controls[] = {
+        SOC_DOUBLE_R_TLV("Digital Playback Volume", TLV320AIC23_LCHNVOL,
+                         TLV320AIC23_RCHNVOL, 0, 127, 0, out_gain_tlv),
+        SOC_SINGLE("Digital Playback Switch", TLV320AIC23_DIGT, 3, 1, 1),
+        SOC_DOUBLE_R("Line Input Switch", TLV320AIC23_LINVOL,
+                     TLV320AIC23_RINVOL, 7, 1, 0),
+        SOC_DOUBLE_R_TLV("Line Input Volume", TLV320AIC23_LINVOL,
+                         TLV320AIC23_RINVOL, 0, 31, 0, input_gain_tlv),
+        SOC_SINGLE("Mic Input Switch", TLV320AIC23_ANLG, 1, 1, 1),
+        SOC_SINGLE("Mic Booster Switch", TLV320AIC23_ANLG, 0, 1, 0),
+        SOC_ENUM("Sidetone Gain", tlv320aic23_sidetone),
+        SOC_ENUM("Playback De-emphasis", tlv320aic23_deemph),
+};
+
+/* add non dapm controls */
+static int tlv320aic23_add_controls(struct snd_soc_codec *codec)
+{
+
+        int err, i;
+
+        for (i = 0; i < ARRAY_SIZE(tlv320aic23_snd_controls); i++) {
+                err = snd_ctl_add(codec->card,
+                                  snd_soc_cnew(&tlv320aic23_snd_controls[i],
+                                               codec, NULL));
+                if (err < 0)
+                        return err;
+        }
+
+        return 0;
+
+}
+
+/* PGA Mixer controls for Line and Mic switch */
+static const struct snd_kcontrol_new tlv320aic23_output_mixer_controls[] = {
+        SOC_DAPM_SINGLE("Line Bypass Switch", TLV320AIC23_ANLG, 3, 1, 0),
+        SOC_DAPM_SINGLE("Mic Sidetone Switch", TLV320AIC23_ANLG, 5, 1, 0),
+        SOC_DAPM_SINGLE("Playback Switch", TLV320AIC23_ANLG, 4, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
+        SND_SOC_DAPM_DAC("DAC", "Playback", TLV320AIC23_PWR, 3, 1),
+        SND_SOC_DAPM_ADC("ADC", "Capture", TLV320AIC23_PWR, 2, 1),
+        SND_SOC_DAPM_MUX("Capture Source", SND_SOC_NOPM, 0, 0,
+                         &tlv320aic23_rec_src_mux_controls),
+        SND_SOC_DAPM_MIXER("Output Mixer", TLV320AIC23_PWR, 4, 1,
+                           &tlv320aic23_output_mixer_controls[0],
+                           ARRAY_SIZE(tlv320aic23_output_mixer_controls)),
+        SND_SOC_DAPM_PGA("Line Input", TLV320AIC23_PWR, 0, 1, NULL, 0),
+        SND_SOC_DAPM_PGA("Mic Input", TLV320AIC23_PWR, 1, 1, NULL, 0),
+
+        SND_SOC_DAPM_OUTPUT("LHPOUT"),
+        SND_SOC_DAPM_OUTPUT("RHPOUT"),
+        SND_SOC_DAPM_OUTPUT("LOUT"),
+        SND_SOC_DAPM_OUTPUT("ROUT"),
+
+        SND_SOC_DAPM_INPUT("LLINEIN"),
+        SND_SOC_DAPM_INPUT("RLINEIN"),
+
+        SND_SOC_DAPM_INPUT("MICIN"),
+};
+
+static const struct snd_soc_dapm_route intercon[] = {
+        /* Output Mixer */
+        {"Output Mixer", "Line Bypass Switch", "Line Input"},
+        {"Output Mixer", "Playback Switch", "DAC"},
+        {"Output Mixer", "Mic Sidetone Switch", "Mic Input"},
+
+        /* Outputs */
+        {"RHPOUT", NULL, "Output Mixer"},
+        {"LHPOUT", NULL, "Output Mixer"},
+        {"LOUT", NULL, "Output Mixer"},
+        {"ROUT", NULL, "Output Mixer"},
+
+        /* Inputs */
+        {"Line Input", "NULL", "LLINEIN"},
+        {"Line Input", "NULL", "RLINEIN"},
+
+        {"Mic Input", "NULL", "MICIN"},
+
+        /* input mux */
+        {"Capture Source", "Line", "Line Input"},
+        {"Capture Source", "Mic", "Mic Input"},
+        {"ADC", NULL, "Capture Source"},
+
+};
+
+/* tlv320aic23 related */
+static const struct tlv320aic23_srate_reg_info srate_reg_info[] = {
+        {4000, 0x06, 1},        /*  4000 */
+        {8000, 0x06, 0},        /*  8000 */
+        {16000, 0x0C, 1},       /* 16000 */
+        {22050, 0x11, 1},       /* 22050 */
+        {24000, 0x00, 1},       /* 24000 */
+        {32000, 0x0C, 0},       /* 32000 */
+        {44100, 0x11, 0},       /* 44100 */
+        {48000, 0x00, 0},       /* 48000 */
+        {88200, 0x1F, 0},       /* 88200 */
+        {96000, 0x0E, 0},       /* 96000 */
+};
+
+static int tlv320aic23_add_widgets(struct snd_soc_codec *codec)
+{
+        snd_soc_dapm_new_controls(codec, tlv320aic23_dapm_widgets,
+                                  ARRAY_SIZE(tlv320aic23_dapm_widgets));
+
+        /* set up audio path interconnects */
+        snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
+
+        snd_soc_dapm_new_widgets(codec);
+        return 0;
+}
+
+static int tlv320aic23_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_reg, data;
+        u8 count = 0;
+
+        iface_reg =
+            tlv320aic23_read_reg_cache(codec,
+                                       TLV320AIC23_DIGT_FMT) & ~(0x03 << 2);
+
+        /* Search for the right sample rate */
+        /* Verify what happens if the rate is not supported
+         * now it goes to 96Khz */
+        while ((srate_reg_info[count].sample_rate != params_rate(params)) &&
+               (count < ARRAY_SIZE(srate_reg_info))) {
+                count++;
+        }
+
+        data =  (srate_reg_info[count].divider << TLV320AIC23_CLKIN_SHIFT) |
+                (srate_reg_info[count]. control << TLV320AIC23_BOSR_SHIFT) |
+                TLV320AIC23_USB_CLK_ON;
+
+        tlv320aic23_write(codec, TLV320AIC23_SRATE, data);
+
+        switch (params_format(params)) {
+        case SNDRV_PCM_FORMAT_S16_LE:
+                break;
+        case SNDRV_PCM_FORMAT_S20_3LE:
+                iface_reg |= (0x01 << 2);
+                break;
+        case SNDRV_PCM_FORMAT_S24_LE:
+                iface_reg |= (0x02 << 2);
+                break;
+        case SNDRV_PCM_FORMAT_S32_LE:
+                iface_reg |= (0x03 << 2);
+                break;
+        }
+        tlv320aic23_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);
+
+        return 0;
+}
+
+static int tlv320aic23_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 */
+        tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0001);
+
+        return 0;
+}
+
+static void tlv320aic23_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) {
+                udelay(50);
+                tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
+        }
+}
+
+static int tlv320aic23_mute(struct snd_soc_dai *dai, int mute)
+{
+        struct snd_soc_codec *codec = dai->codec;
+        u16 reg;
+
+        reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_DIGT);
+        if (mute)
+                reg |= TLV320AIC23_DACM_MUTE;
+
+        else
+                reg &= ~TLV320AIC23_DACM_MUTE;
+
+        tlv320aic23_write(codec, TLV320AIC23_DIGT, reg);
+
+        return 0;
+}
+
+static int tlv320aic23_set_dai_fmt(struct snd_soc_dai *codec_dai,
+                                   unsigned int fmt)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        u16 iface_reg;
+
+        iface_reg =
+            tlv320aic23_read_reg_cache(codec, TLV320AIC23_DIGT_FMT) & (~0x03);
+
+        /* set master/slave audio interface */
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBM_CFM:
+                iface_reg |= TLV320AIC23_MS_MASTER;
+                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_reg |= TLV320AIC23_FOR_I2S;
+                break;
+        case SND_SOC_DAIFMT_DSP_A:
+                iface_reg |= TLV320AIC23_FOR_DSP;
+                break;
+        case SND_SOC_DAIFMT_RIGHT_J:
+                break;
+        case SND_SOC_DAIFMT_LEFT_J:
+                iface_reg |= TLV320AIC23_FOR_LJUST;
+                break;
+        default:
+                return -EINVAL;
+
+        }
+
+        tlv320aic23_write(codec, TLV320AIC23_DIGT_FMT, iface_reg);
+
+        return 0;
+}
+
+static int tlv320aic23_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;
+
+        switch (freq) {
+        case 12000000:
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static int tlv320aic23_set_bias_level(struct snd_soc_codec *codec,
+                                      enum snd_soc_bias_level level)
+{
+        u16 reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_PWR) & 0xff7f;
+
+        switch (level) {
+        case SND_SOC_BIAS_ON:
+                /* vref/mid, osc on, dac unmute */
+                tlv320aic23_write(codec, TLV320AIC23_PWR, reg);
+                break;
+        case SND_SOC_BIAS_PREPARE:
+                break;
+        case SND_SOC_BIAS_STANDBY:
+                /* everything off except vref/vmid, */
+                tlv320aic23_write(codec, TLV320AIC23_PWR, reg | 0x0040);
+                break;
+        case SND_SOC_BIAS_OFF:
+                /* everything off, dac mute, inactive */
+                tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
+                tlv320aic23_write(codec, TLV320AIC23_PWR, 0xffff);
+                break;
+        }
+        codec->bias_level = level;
+        return 0;
+}
+
+#define AIC23_RATES     SNDRV_PCM_RATE_8000_96000
+#define AIC23_FORMATS   (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+                         SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+struct snd_soc_dai tlv320aic23_dai = {
+        .name = "tlv320aic23",
+        .playback = {
+                     .stream_name = "Playback",
+                     .channels_min = 2,
+                     .channels_max = 2,
+                     .rates = AIC23_RATES,
+                     .formats = AIC23_FORMATS,},
+        .capture = {
+                    .stream_name = "Capture",
+                    .channels_min = 2,
+                    .channels_max = 2,
+                    .rates = AIC23_RATES,
+                    .formats = AIC23_FORMATS,},
+        .ops = {
+                .prepare = tlv320aic23_pcm_prepare,
+                .hw_params = tlv320aic23_hw_params,
+                .shutdown = tlv320aic23_shutdown,
+                },
+        .dai_ops = {
+                    .digital_mute = tlv320aic23_mute,
+                    .set_fmt = tlv320aic23_set_dai_fmt,
+                    .set_sysclk = tlv320aic23_set_dai_sysclk,
+                    }
+};
+EXPORT_SYMBOL_GPL(tlv320aic23_dai);
+
+static int tlv320aic23_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;
+
+        tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x0);
+        tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+        return 0;
+}
+
+static int tlv320aic23_resume(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec = socdev->codec;
+        int i;
+        u16 reg;
+
+        /* Sync reg_cache with the hardware */
+        for (reg = 0; reg < ARRAY_SIZE(tlv320aic23_reg); i++) {
+                u16 val = tlv320aic23_read_reg_cache(codec, reg);
+                tlv320aic23_write(codec, reg, val);
+        }
+
+        tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+        tlv320aic23_set_bias_level(codec, codec->suspend_bias_level);
+
+        return 0;
+}
+
+/*
+ * initialise the AIC23 driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int tlv320aic23_init(struct snd_soc_device *socdev)
+{
+        struct snd_soc_codec *codec = socdev->codec;
+        int ret = 0;
+        u16 reg;
+
+        codec->name = "tlv320aic23";
+        codec->owner = THIS_MODULE;
+        codec->read = tlv320aic23_read_reg_cache;
+        codec->write = tlv320aic23_write;
+        codec->set_bias_level = tlv320aic23_set_bias_level;
+        codec->dai = &tlv320aic23_dai;
+        codec->num_dai = 1;
+        codec->reg_cache_size = ARRAY_SIZE(tlv320aic23_reg);
+        codec->reg_cache =
+            kmemdup(tlv320aic23_reg, sizeof(tlv320aic23_reg), GFP_KERNEL);
+        if (codec->reg_cache == NULL)
+                return -ENOMEM;
+
+        /* Reset codec */
+        tlv320aic23_write(codec, TLV320AIC23_RESET, 0);
+
+        /* register pcms */
+        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+        if (ret < 0) {
+                printk(KERN_ERR "tlv320aic23: failed to create pcms\n");
+                goto pcm_err;
+        }
+
+        /* power on device */
+        tlv320aic23_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+        tlv320aic23_write(codec, TLV320AIC23_DIGT, TLV320AIC23_DEEMP_44K);
+
+        /* Unmute input */
+        reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_LINVOL);
+        tlv320aic23_write(codec, TLV320AIC23_LINVOL,
+                          (reg & (~TLV320AIC23_LIM_MUTED)) |
+                          (TLV320AIC23_LRS_ENABLED));
+
+        reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_RINVOL);
+        tlv320aic23_write(codec, TLV320AIC23_RINVOL,
+                          (reg & (~TLV320AIC23_LIM_MUTED)) |
+                          TLV320AIC23_LRS_ENABLED);
+
+        reg = tlv320aic23_read_reg_cache(codec, TLV320AIC23_ANLG);
+        tlv320aic23_write(codec, TLV320AIC23_ANLG,
+                         (reg) & (~TLV320AIC23_BYPASS_ON) &
+                         (~TLV320AIC23_MICM_MUTED));
+
+        /* Default output volume */
+        tlv320aic23_write(codec, TLV320AIC23_LCHNVOL,
+                          TLV320AIC23_DEFAULT_OUT_VOL &
+                          TLV320AIC23_OUT_VOL_MASK);
+        tlv320aic23_write(codec, TLV320AIC23_RCHNVOL,
+                          TLV320AIC23_DEFAULT_OUT_VOL &
+                          TLV320AIC23_OUT_VOL_MASK);
+
+        tlv320aic23_write(codec, TLV320AIC23_ACTIVE, 0x1);
+
+        tlv320aic23_add_controls(codec);
+        tlv320aic23_add_widgets(codec);
+        ret = snd_soc_register_card(socdev);
+        if (ret < 0) {
+                printk(KERN_ERR "tlv320aic23: 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 *tlv320aic23_socdev;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+/*
+ * If the i2c layer weren't so broken, we could pass this kind of data
+ * around
+ */
+static int tlv320aic23_codec_probe(struct i2c_client *i2c,
+                                   const struct i2c_device_id *i2c_id)
+{
+        struct snd_soc_device *socdev = tlv320aic23_socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        int ret;
+
+        if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                return -EINVAL;
+
+        i2c_set_clientdata(i2c, codec);
+        codec->control_data = i2c;
+
+        ret = tlv320aic23_init(socdev);
+        if (ret < 0) {
+                printk(KERN_ERR "tlv320aic23: failed to initialise AIC23\n");
+                goto err;
+        }
+        return ret;
+
+err:
+        kfree(codec);
+        kfree(i2c);
+        return ret;
+}
+static int __exit tlv320aic23_i2c_remove(struct i2c_client *i2c)
+{
+        put_device(&i2c->dev);
+        return 0;
+}
+
+static const struct i2c_device_id tlv320aic23_id[] = {
+        {"tlv320aic23", 0},
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, tlv320aic23_id);
+
+static struct i2c_driver tlv320aic23_i2c_driver = {
+        .driver = {
+                   .name = "tlv320aic23",
+                   },
+        .probe = tlv320aic23_codec_probe,
+        .remove = __exit_p(tlv320aic23_i2c_remove),
+        .id_table = tlv320aic23_id,
+};
+
+#endif
+
+static int tlv320aic23_probe(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec;
+        int ret = 0;
+
+        printk(KERN_INFO "AIC23 Audio Codec %s\n", AIC23_VERSION);
+
+        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);
+
+        tlv320aic23_socdev = socdev;
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+        codec->hw_write = (hw_write_t) i2c_smbus_write_byte_data;
+        codec->hw_read = NULL;
+        ret = i2c_add_driver(&tlv320aic23_i2c_driver);
+        if (ret != 0)
+                printk(KERN_ERR "can't add i2c driver");
+#endif
+        return ret;
+}
+
+static int tlv320aic23_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)
+                tlv320aic23_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(&tlv320aic23_i2c_driver);
+#endif
+        kfree(codec->reg_cache);
+        kfree(codec);
+
+        return 0;
+}
+struct snd_soc_codec_device soc_codec_dev_tlv320aic23 = {
+        .probe = tlv320aic23_probe,
+        .remove = tlv320aic23_remove,
+        .suspend = tlv320aic23_suspend,
+        .resume = tlv320aic23_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_tlv320aic23);
+
+MODULE_DESCRIPTION("ASoC TLV320AIC23 codec driver");
+MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
+MODULE_LICENSE("GPL");