/*
 * uda1380.c - Philips UDA1380 ALSA SoC audio driver
 *
 * 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.
 *
 * Copyright (c) 2007-2009 Philipp Zabel <philipp.zabel@gmail.com>
 *
 * Modified by Richard Purdie <richard@openedhand.com> to fit into SoC
 * codec model.
 *
 * Copyright (c) 2005 Giorgio Padrin <giorgio@mandarinlogiq.org>
 * Copyright 2005 Openedhand Ltd.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include <sound/uda1380.h>

#include "uda1380.h"

/* codec private data */
struct uda1380_priv {
        struct snd_soc_codec *codec;
        unsigned int dac_clk;
        struct work_struct work;
        void *control_data;
};

/*
 * uda1380 register cache
 */
static const u16 uda1380_reg[UDA1380_CACHEREGNUM] = {
        0x0502, 0x0000, 0x0000, 0x3f3f,
        0x0202, 0x0000, 0x0000, 0x0000,
        0x0000, 0x0000, 0x0000, 0x0000,
        0x0000, 0x0000, 0x0000, 0x0000,
        0x0000, 0xff00, 0x0000, 0x4800,
        0x0000, 0x0000, 0x0000, 0x0000,
        0x0000, 0x0000, 0x0000, 0x0000,
        0x0000, 0x0000, 0x0000, 0x0000,
        0x0000, 0x8000, 0x0002, 0x0000,
};

static unsigned long uda1380_cache_dirty;

/*
 * read uda1380 register cache
 */
static inline unsigned int uda1380_read_reg_cache(struct snd_soc_codec *codec,
        unsigned int reg)
{
        u16 *cache = codec->reg_cache;
        if (reg == UDA1380_RESET)
                return 0;
        if (reg >= UDA1380_CACHEREGNUM)
                return -1;
        return cache[reg];
}

/*
 * write uda1380 register cache
 */
static inline void uda1380_write_reg_cache(struct snd_soc_codec *codec,
        u16 reg, unsigned int value)
{
        u16 *cache = codec->reg_cache;

        if (reg >= UDA1380_CACHEREGNUM)
                return;
        if ((reg >= 0x10) && (cache[reg] != value))
                set_bit(reg - 0x10, &uda1380_cache_dirty);
        cache[reg] = value;
}

/*
 * write to the UDA1380 register space
 */
static int uda1380_write(struct snd_soc_codec *codec, unsigned int reg,
        unsigned int value)
{
        u8 data[3];

        /* data is
         *   data[0] is register offset
         *   data[1] is MS byte
         *   data[2] is LS byte
         */
        data[0] = reg;
        data[1] = (value & 0xff00) >> 8;
        data[2] = value & 0x00ff;

        uda1380_write_reg_cache(codec, reg, value);

        /* the interpolator & decimator regs must only be written when the
         * codec DAI is active.
         */
        if (!codec->active && (reg >= UDA1380_MVOL))
                return 0;
        pr_debug("uda1380: hw write %x val %x\n", reg, value);
        if (codec->hw_write(codec->control_data, data, 3) == 3) {
                unsigned int val;
                i2c_master_send(codec->control_data, data, 1);
                i2c_master_recv(codec->control_data, data, 2);
                val = (data[0]<<8) | data[1];
                if (val != value) {
                        pr_debug("uda1380: READ BACK VAL %x\n",
                                        (data[0]<<8) | data[1]);
                        return -EIO;
                }
                if (reg >= 0x10)
                        clear_bit(reg - 0x10, &uda1380_cache_dirty);
                return 0;
        } else
                return -EIO;
}

static void uda1380_sync_cache(struct snd_soc_codec *codec)
{
        int reg;
        u8 data[3];
        u16 *cache = codec->reg_cache;

        /* Sync reg_cache with the hardware */
        for (reg = 0; reg < UDA1380_MVOL; reg++) {
                data[0] = reg;
                data[1] = (cache[reg] & 0xff00) >> 8;
                data[2] = cache[reg] & 0x00ff;
                if (codec->hw_write(codec->control_data, data, 3) != 3)
                        dev_err(codec->dev, "%s: write to reg 0x%x failed\n",
                                __func__, reg);
        }
}

static int uda1380_reset(struct snd_soc_codec *codec)
{
        struct uda1380_platform_data *pdata = codec->dev->platform_data;

        if (gpio_is_valid(pdata->gpio_reset)) {
                gpio_set_value(pdata->gpio_reset, 1);
                mdelay(1);
                gpio_set_value(pdata->gpio_reset, 0);
        } else {
                u8 data[3];

                data[0] = UDA1380_RESET;
                data[1] = 0;
                data[2] = 0;

                if (codec->hw_write(codec->control_data, data, 3) != 3) {
                        dev_err(codec->dev, "%s: failed\n", __func__);
                        return -EIO;
                }
        }

        return 0;
}

static void uda1380_flush_work(struct work_struct *work)
{
        struct uda1380_priv *uda1380 = container_of(work, struct uda1380_priv, work);
        struct snd_soc_codec *uda1380_codec = uda1380->codec;
        int bit, reg;

        for_each_set_bit(bit, &uda1380_cache_dirty, UDA1380_CACHEREGNUM - 0x10) {
                reg = 0x10 + bit;
                pr_debug("uda1380: flush reg %x val %x:\n", reg,
                                uda1380_read_reg_cache(uda1380_codec, reg));
                uda1380_write(uda1380_codec, reg,
                                uda1380_read_reg_cache(uda1380_codec, reg));
                clear_bit(bit, &uda1380_cache_dirty);
        }

}

/* declarations of ALSA reg_elem_REAL controls */
static const char *uda1380_deemp[] = {
        "None",
        "32kHz",
        "44.1kHz",
        "48kHz",
        "96kHz",
};
static const char *uda1380_input_sel[] = {
        "Line",
        "Mic + Line R",
        "Line L",
        "Mic",
};
static const char *uda1380_output_sel[] = {
        "DAC",
        "Analog Mixer",
};
static const char *uda1380_spf_mode[] = {
        "Flat",
        "Minimum1",
        "Minimum2",
        "Maximum"
};
static const char *uda1380_capture_sel[] = {
        "ADC",
        "Digital Mixer"
};
static const char *uda1380_sel_ns[] = {
        "3rd-order",
        "5th-order"
};
static const char *uda1380_mix_control[] = {
        "off",
        "PCM only",
        "before sound processing",
        "after sound processing"
};
static const char *uda1380_sdet_setting[] = {
        "3200",
        "4800",
        "9600",
        "19200"
};
static const char *uda1380_os_setting[] = {
        "single-speed",
        "double-speed (no mixing)",
        "quad-speed (no mixing)"
};

static const struct soc_enum uda1380_deemp_enum[] = {
        SOC_ENUM_SINGLE(UDA1380_DEEMP, 8, 5, uda1380_deemp),
        SOC_ENUM_SINGLE(UDA1380_DEEMP, 0, 5, uda1380_deemp),
};
static const struct soc_enum uda1380_input_sel_enum =
        SOC_ENUM_SINGLE(UDA1380_ADC, 2, 4, uda1380_input_sel);          /* SEL_MIC, SEL_LNA */
static const struct soc_enum uda1380_output_sel_enum =
        SOC_ENUM_SINGLE(UDA1380_PM, 7, 2, uda1380_output_sel);          /* R02_EN_AVC */
static const struct soc_enum uda1380_spf_enum =
        SOC_ENUM_SINGLE(UDA1380_MODE, 14, 4, uda1380_spf_mode);         /* M */
static const struct soc_enum uda1380_capture_sel_enum =
        SOC_ENUM_SINGLE(UDA1380_IFACE, 6, 2, uda1380_capture_sel);      /* SEL_SOURCE */
static const struct soc_enum uda1380_sel_ns_enum =
        SOC_ENUM_SINGLE(UDA1380_MIXER, 14, 2, uda1380_sel_ns);          /* SEL_NS */
static const struct soc_enum uda1380_mix_enum =
        SOC_ENUM_SINGLE(UDA1380_MIXER, 12, 4, uda1380_mix_control);     /* MIX, MIX_POS */
static const struct soc_enum uda1380_sdet_enum =
        SOC_ENUM_SINGLE(UDA1380_MIXER, 4, 4, uda1380_sdet_setting);     /* SD_VALUE */
static const struct soc_enum uda1380_os_enum =
        SOC_ENUM_SINGLE(UDA1380_MIXER, 0, 3, uda1380_os_setting);       /* OS */

/*
 * from -48 dB in 1.5 dB steps (mute instead of -49.5 dB)
 */
static DECLARE_TLV_DB_SCALE(amix_tlv, -4950, 150, 1);

/*
 * from -78 dB in 1 dB steps (3 dB steps, really. LSB are ignored),
 * from -66 dB in 0.5 dB steps (2 dB steps, really) and
 * from -52 dB in 0.25 dB steps
 */
static const unsigned int mvol_tlv[] = {
        TLV_DB_RANGE_HEAD(3),
        0, 15, TLV_DB_SCALE_ITEM(-8200, 100, 1),
        16, 43, TLV_DB_SCALE_ITEM(-6600, 50, 0),
        44, 252, TLV_DB_SCALE_ITEM(-5200, 25, 0),
};

/*
 * from -72 dB in 1.5 dB steps (6 dB steps really),
 * from -66 dB in 0.75 dB steps (3 dB steps really),
 * from -60 dB in 0.5 dB steps (2 dB steps really) and
 * from -46 dB in 0.25 dB steps
 */
static const unsigned int vc_tlv[] = {
        TLV_DB_RANGE_HEAD(4),
        0, 7, TLV_DB_SCALE_ITEM(-7800, 150, 1),
        8, 15, TLV_DB_SCALE_ITEM(-6600, 75, 0),
        16, 43, TLV_DB_SCALE_ITEM(-6000, 50, 0),
        44, 228, TLV_DB_SCALE_ITEM(-4600, 25, 0),
};

/* from 0 to 6 dB in 2 dB steps if SPF mode != flat */
static DECLARE_TLV_DB_SCALE(tr_tlv, 0, 200, 0);

/* from 0 to 24 dB in 2 dB steps, if SPF mode == maximum, otherwise cuts
 * off at 18 dB max) */
static DECLARE_TLV_DB_SCALE(bb_tlv, 0, 200, 0);

/* from -63 to 24 dB in 0.5 dB steps (-128...48) */
static DECLARE_TLV_DB_SCALE(dec_tlv, -6400, 50, 1);

/* from 0 to 24 dB in 3 dB steps */
static DECLARE_TLV_DB_SCALE(pga_tlv, 0, 300, 0);

/* from 0 to 30 dB in 2 dB steps */
static DECLARE_TLV_DB_SCALE(vga_tlv, 0, 200, 0);

static const struct snd_kcontrol_new uda1380_snd_controls[] = {
        SOC_DOUBLE_TLV("Analog Mixer Volume", UDA1380_AMIX, 0, 8, 44, 1, amix_tlv),     /* AVCR, AVCL */
        SOC_DOUBLE_TLV("Master Playback Volume", UDA1380_MVOL, 0, 8, 252, 1, mvol_tlv), /* MVCL, MVCR */
        SOC_SINGLE_TLV("ADC Playback Volume", UDA1380_MIXVOL, 8, 228, 1, vc_tlv),       /* VC2 */
        SOC_SINGLE_TLV("PCM Playback Volume", UDA1380_MIXVOL, 0, 228, 1, vc_tlv),       /* VC1 */
        SOC_ENUM("Sound Processing Filter", uda1380_spf_enum),                          /* M */
        SOC_DOUBLE_TLV("Tone Control - Treble", UDA1380_MODE, 4, 12, 3, 0, tr_tlv),     /* TRL, TRR */
        SOC_DOUBLE_TLV("Tone Control - Bass", UDA1380_MODE, 0, 8, 15, 0, bb_tlv),       /* BBL, BBR */
/**/    SOC_SINGLE("Master Playback Switch", UDA1380_DEEMP, 14, 1, 1),          /* MTM */
        SOC_SINGLE("ADC Playback Switch", UDA1380_DEEMP, 11, 1, 1),             /* MT2 from decimation filter */
        SOC_ENUM("ADC Playback De-emphasis", uda1380_deemp_enum[0]),            /* DE2 */
        SOC_SINGLE("PCM Playback Switch", UDA1380_DEEMP, 3, 1, 1),              /* MT1, from digital data input */
        SOC_ENUM("PCM Playback De-emphasis", uda1380_deemp_enum[1]),            /* DE1 */
        SOC_SINGLE("DAC Polarity inverting Switch", UDA1380_MIXER, 15, 1, 0),   /* DA_POL_INV */
        SOC_ENUM("Noise Shaper", uda1380_sel_ns_enum),                          /* SEL_NS */
        SOC_ENUM("Digital Mixer Signal Control", uda1380_mix_enum),             /* MIX_POS, MIX */
        SOC_SINGLE("Silence Detector Switch", UDA1380_MIXER, 6, 1, 0),          /* SDET_ON */
        SOC_ENUM("Silence Detector Setting", uda1380_sdet_enum),                /* SD_VALUE */
        SOC_ENUM("Oversampling Input", uda1380_os_enum),                        /* OS */
        SOC_DOUBLE_S8_TLV("ADC Capture Volume", UDA1380_DEC, -128, 48, dec_tlv),        /* ML_DEC, MR_DEC */
/**/    SOC_SINGLE("ADC Capture Switch", UDA1380_PGA, 15, 1, 1),                /* MT_ADC */
        SOC_DOUBLE_TLV("Line Capture Volume", UDA1380_PGA, 0, 8, 8, 0, pga_tlv), /* PGA_GAINCTRLL, PGA_GAINCTRLR */
        SOC_SINGLE("ADC Polarity inverting Switch", UDA1380_ADC, 12, 1, 0),     /* ADCPOL_INV */
        SOC_SINGLE_TLV("Mic Capture Volume", UDA1380_ADC, 8, 15, 0, vga_tlv),   /* VGA_CTRL */
        SOC_SINGLE("DC Filter Bypass Switch", UDA1380_ADC, 1, 1, 0),            /* SKIP_DCFIL (before decimator) */
        SOC_SINGLE("DC Filter Enable Switch", UDA1380_ADC, 0, 1, 0),            /* EN_DCFIL (at output of decimator) */
        SOC_SINGLE("AGC Timing", UDA1380_AGC, 8, 7, 0),                 /* TODO: enum, see table 62 */
        SOC_SINGLE("AGC Target level", UDA1380_AGC, 2, 3, 1),                   /* AGC_LEVEL */
        /* -5.5, -8, -11.5, -14 dBFS */
        SOC_SINGLE("AGC Switch", UDA1380_AGC, 0, 1, 0),
};

/* Input mux */
static const struct snd_kcontrol_new uda1380_input_mux_control =
        SOC_DAPM_ENUM("Route", uda1380_input_sel_enum);

/* Output mux */
static const struct snd_kcontrol_new uda1380_output_mux_control =
        SOC_DAPM_ENUM("Route", uda1380_output_sel_enum);

/* Capture mux */
static const struct snd_kcontrol_new uda1380_capture_mux_control =
        SOC_DAPM_ENUM("Route", uda1380_capture_sel_enum);


static const struct snd_soc_dapm_widget uda1380_dapm_widgets[] = {
        SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
                &uda1380_input_mux_control),
        SND_SOC_DAPM_MUX("Output Mux", SND_SOC_NOPM, 0, 0,
                &uda1380_output_mux_control),
        SND_SOC_DAPM_MUX("Capture Mux", SND_SOC_NOPM, 0, 0,
                &uda1380_capture_mux_control),
        SND_SOC_DAPM_PGA("Left PGA", UDA1380_PM, 3, 0, NULL, 0),
        SND_SOC_DAPM_PGA("Right PGA", UDA1380_PM, 1, 0, NULL, 0),
        SND_SOC_DAPM_PGA("Mic LNA", UDA1380_PM, 4, 0, NULL, 0),
        SND_SOC_DAPM_ADC("Left ADC", "Left Capture", UDA1380_PM, 2, 0),
        SND_SOC_DAPM_ADC("Right ADC", "Right Capture", UDA1380_PM, 0, 0),
        SND_SOC_DAPM_INPUT("VINM"),
        SND_SOC_DAPM_INPUT("VINL"),
        SND_SOC_DAPM_INPUT("VINR"),
        SND_SOC_DAPM_MIXER("Analog Mixer", UDA1380_PM, 6, 0, NULL, 0),
        SND_SOC_DAPM_OUTPUT("VOUTLHP"),
        SND_SOC_DAPM_OUTPUT("VOUTRHP"),
        SND_SOC_DAPM_OUTPUT("VOUTL"),
        SND_SOC_DAPM_OUTPUT("VOUTR"),
        SND_SOC_DAPM_DAC("DAC", "Playback", UDA1380_PM, 10, 0),
        SND_SOC_DAPM_PGA("HeadPhone Driver", UDA1380_PM, 13, 0, NULL, 0),
};

static const struct snd_soc_dapm_route uda1380_dapm_routes[] = {

        /* output mux */
        {"HeadPhone Driver", NULL, "Output Mux"},
        {"VOUTR", NULL, "Output Mux"},
        {"VOUTL", NULL, "Output Mux"},

        {"Analog Mixer", NULL, "VINR"},
        {"Analog Mixer", NULL, "VINL"},
        {"Analog Mixer", NULL, "DAC"},

        {"Output Mux", "DAC", "DAC"},
        {"Output Mux", "Analog Mixer", "Analog Mixer"},

        /* {"DAC", "Digital Mixer", "I2S" } */

        /* headphone driver */
        {"VOUTLHP", NULL, "HeadPhone Driver"},
        {"VOUTRHP", NULL, "HeadPhone Driver"},

        /* input mux */
        {"Left ADC", NULL, "Input Mux"},
        {"Input Mux", "Mic", "Mic LNA"},
        {"Input Mux", "Mic + Line R", "Mic LNA"},
        {"Input Mux", "Line L", "Left PGA"},
        {"Input Mux", "Line", "Left PGA"},

        /* right input */
        {"Right ADC", "Mic + Line R", "Right PGA"},
        {"Right ADC", "Line", "Right PGA"},

        /* inputs */
        {"Mic LNA", NULL, "VINM"},
        {"Left PGA", NULL, "VINL"},
        {"Right PGA", NULL, "VINR"},
};

static int uda1380_set_dai_fmt_both(struct snd_soc_dai *codec_dai,
                unsigned int fmt)
{
        struct snd_soc_codec *codec = codec_dai->codec;
        int iface;

        /* set up DAI based upon fmt */
        iface = uda1380_read_reg_cache(codec, UDA1380_IFACE);
        iface &= ~(R01_SFORI_MASK | R01_SIM | R01_SFORO_MASK);

        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                iface |= R01_SFORI_I2S | R01_SFORO_I2S;
                break;
        case SND_SOC_DAIFMT_LSB:
                iface |= R01_SFORI_LSB16 | R01_SFORO_LSB16;
                break;
        case SND_SOC_DAIFMT_MSB:
                iface |= R01_SFORI_MSB | R01_SFORO_MSB;
        }

        /* DATAI is slave only, so in single-link mode, this has to be slave */
        if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
                return -EINVAL;

        uda1380_write(codec, UDA1380_IFACE, iface);

        return 0;
}

static int uda1380_set_dai_fmt_playback(struct snd_soc_dai *codec_dai,
                unsigned int fmt)
{
        struct snd_soc_codec *codec = codec_dai->codec;
        int iface;

        /* set up DAI based upon fmt */
        iface = uda1380_read_reg_cache(codec, UDA1380_IFACE);
        iface &= ~R01_SFORI_MASK;

        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                iface |= R01_SFORI_I2S;
                break;
        case SND_SOC_DAIFMT_LSB:
                iface |= R01_SFORI_LSB16;
                break;
        case SND_SOC_DAIFMT_MSB:
                iface |= R01_SFORI_MSB;
        }

        /* DATAI is slave only, so this has to be slave */
        if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
                return -EINVAL;

        uda1380_write(codec, UDA1380_IFACE, iface);

        return 0;
}

static int uda1380_set_dai_fmt_capture(struct snd_soc_dai *codec_dai,
                unsigned int fmt)
{
        struct snd_soc_codec *codec = codec_dai->codec;
        int iface;

        /* set up DAI based upon fmt */
        iface = uda1380_read_reg_cache(codec, UDA1380_IFACE);
        iface &= ~(R01_SIM | R01_SFORO_MASK);

        switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
        case SND_SOC_DAIFMT_I2S:
                iface |= R01_SFORO_I2S;
                break;
        case SND_SOC_DAIFMT_LSB:
                iface |= R01_SFORO_LSB16;
                break;
        case SND_SOC_DAIFMT_MSB:
                iface |= R01_SFORO_MSB;
        }

        if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) == SND_SOC_DAIFMT_CBM_CFM)
                iface |= R01_SIM;

        uda1380_write(codec, UDA1380_IFACE, iface);

        return 0;
}

static int uda1380_trigger(struct snd_pcm_substream *substream, int cmd,
                struct snd_soc_dai *dai)
{
        struct snd_soc_codec *codec = dai->codec;
        struct uda1380_priv *uda1380 = snd_soc_codec_get_drvdata(codec);
        int mixer = uda1380_read_reg_cache(codec, UDA1380_MIXER);

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                uda1380_write_reg_cache(codec, UDA1380_MIXER,
                                        mixer & ~R14_SILENCE);
                schedule_work(&uda1380->work);
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                uda1380_write_reg_cache(codec, UDA1380_MIXER,
                                        mixer | R14_SILENCE);
                schedule_work(&uda1380->work);
                break;
        }
        return 0;
}

static int uda1380_pcm_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *params,
                                 struct snd_soc_dai *dai)
{
        struct snd_soc_codec *codec = dai->codec;
        u16 clk = uda1380_read_reg_cache(codec, UDA1380_CLK);

        /* set WSPLL power and divider if running from this clock */
        if (clk & R00_DAC_CLK) {
                int rate = params_rate(params);
                u16 pm = uda1380_read_reg_cache(codec, UDA1380_PM);
                clk &= ~0x3; /* clear SEL_LOOP_DIV */
                switch (rate) {
                case 6250 ... 12500:
                        clk |= 0x0;
                        break;
                case 12501 ... 25000:
                        clk |= 0x1;
                        break;
                case 25001 ... 50000:
                        clk |= 0x2;
                        break;
                case 50001 ... 100000:
                        clk |= 0x3;
                        break;
                }
                uda1380_write(codec, UDA1380_PM, R02_PON_PLL | pm);
        }

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                clk |= R00_EN_DAC | R00_EN_INT;
        else
                clk |= R00_EN_ADC | R00_EN_DEC;

        uda1380_write(codec, UDA1380_CLK, clk);
        return 0;
}

static void uda1380_pcm_shutdown(struct snd_pcm_substream *substream,
                                 struct snd_soc_dai *dai)
{
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct snd_soc_codec *codec = rtd->codec;
        u16 clk = uda1380_read_reg_cache(codec, UDA1380_CLK);

        /* shut down WSPLL power if running from this clock */
        if (clk & R00_DAC_CLK) {
                u16 pm = uda1380_read_reg_cache(codec, UDA1380_PM);
                uda1380_write(codec, UDA1380_PM, ~R02_PON_PLL & pm);
        }

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                clk &= ~(R00_EN_DAC | R00_EN_INT);
        else
                clk &= ~(R00_EN_ADC | R00_EN_DEC);

        uda1380_write(codec, UDA1380_CLK, clk);
}

static int uda1380_set_bias_level(struct snd_soc_codec *codec,
        enum snd_soc_bias_level level)
{
        int pm = uda1380_read_reg_cache(codec, UDA1380_PM);
        int reg;
        struct uda1380_platform_data *pdata = codec->dev->platform_data;

        if (codec->dapm.bias_level == level)
                return 0;

        switch (level) {
        case SND_SOC_BIAS_ON:
        case SND_SOC_BIAS_PREPARE:
                /* ADC, DAC on */
                uda1380_write(codec, UDA1380_PM, R02_PON_BIAS | pm);
                break;
        case SND_SOC_BIAS_STANDBY:
                if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
                        if (gpio_is_valid(pdata->gpio_power)) {
                                gpio_set_value(pdata->gpio_power, 1);
                                mdelay(1);
                                uda1380_reset(codec);
                        }

                        uda1380_sync_cache(codec);
                }
                uda1380_write(codec, UDA1380_PM, 0x0);
                break;
        case SND_SOC_BIAS_OFF:
                if (!gpio_is_valid(pdata->gpio_power))
                        break;

                gpio_set_value(pdata->gpio_power, 0);

                /* Mark mixer regs cache dirty to sync them with
                 * codec regs on power on.
                 */
                for (reg = UDA1380_MVOL; reg < UDA1380_CACHEREGNUM; reg++)
                        set_bit(reg - 0x10, &uda1380_cache_dirty);
        }
        codec->dapm.bias_level = level;
        return 0;
}

#define UDA1380_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)

static const struct snd_soc_dai_ops uda1380_dai_ops = {
        .hw_params      = uda1380_pcm_hw_params,
        .shutdown       = uda1380_pcm_shutdown,
        .trigger        = uda1380_trigger,
        .set_fmt        = uda1380_set_dai_fmt_both,
};

static const struct snd_soc_dai_ops uda1380_dai_ops_playback = {
        .hw_params      = uda1380_pcm_hw_params,
        .shutdown       = uda1380_pcm_shutdown,
        .trigger        = uda1380_trigger,
        .set_fmt        = uda1380_set_dai_fmt_playback,
};

static const struct snd_soc_dai_ops uda1380_dai_ops_capture = {
        .hw_params      = uda1380_pcm_hw_params,
        .shutdown       = uda1380_pcm_shutdown,
        .trigger        = uda1380_trigger,
        .set_fmt        = uda1380_set_dai_fmt_capture,
};

static struct snd_soc_dai_driver uda1380_dai[] = {
{
        .name = "uda1380-hifi",
        .playback = {
                .stream_name = "Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = UDA1380_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
        .capture = {
                .stream_name = "Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = UDA1380_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
        .ops = &uda1380_dai_ops,
},
{ /* playback only - dual interface */
        .name = "uda1380-hifi-playback",
        .playback = {
                .stream_name = "Playback",
                .channels_min = 1,
                .channels_max = 2,
                .rates = UDA1380_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
        .ops = &uda1380_dai_ops_playback,
},
{ /* capture only - dual interface*/
        .name = "uda1380-hifi-capture",
        .capture = {
                .stream_name = "Capture",
                .channels_min = 1,
                .channels_max = 2,
                .rates = UDA1380_RATES,
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
        .ops = &uda1380_dai_ops_capture,
},
};

static int uda1380_suspend(struct snd_soc_codec *codec)
{
        uda1380_set_bias_level(codec, SND_SOC_BIAS_OFF);
        return 0;
}

static int uda1380_resume(struct snd_soc_codec *codec)
{
        uda1380_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
        return 0;
}

static int uda1380_probe(struct snd_soc_codec *codec)
{
        struct uda1380_platform_data *pdata =codec->dev->platform_data;
        struct uda1380_priv *uda1380 = snd_soc_codec_get_drvdata(codec);
        int ret;

        uda1380->codec = codec;

        codec->hw_write = (hw_write_t)i2c_master_send;
        codec->control_data = uda1380->control_data;

        if (!pdata)
                return -EINVAL;

        if (gpio_is_valid(pdata->gpio_reset)) {
                ret = gpio_request_one(pdata->gpio_reset, GPIOF_OUT_INIT_LOW,
                                       "uda1380 reset");
                if (ret)
                        goto err_out;
        }

        if (gpio_is_valid(pdata->gpio_power)) {
                ret = gpio_request_one(pdata->gpio_power, GPIOF_OUT_INIT_LOW,
                                   "uda1380 power");
                if (ret)
                        goto err_free_gpio;
        } else {
                ret = uda1380_reset(codec);
                if (ret)
                        goto err_free_gpio;
        }

        INIT_WORK(&uda1380->work, uda1380_flush_work);

        /* power on device */
        uda1380_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
        /* set clock input */
        switch (pdata->dac_clk) {
        case UDA1380_DAC_CLK_SYSCLK:
                uda1380_write_reg_cache(codec, UDA1380_CLK, 0);
                break;
        case UDA1380_DAC_CLK_WSPLL:
                uda1380_write_reg_cache(codec, UDA1380_CLK,
                        R00_DAC_CLK);
                break;
        }

        return 0;

err_free_gpio:
        if (gpio_is_valid(pdata->gpio_reset))
                gpio_free(pdata->gpio_reset);
err_out:
        return ret;
}

/* power down chip */
static int uda1380_remove(struct snd_soc_codec *codec)
{
        struct uda1380_platform_data *pdata =codec->dev->platform_data;

        uda1380_set_bias_level(codec, SND_SOC_BIAS_OFF);

        gpio_free(pdata->gpio_reset);
        gpio_free(pdata->gpio_power);

        return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_uda1380 = {
        .probe =        uda1380_probe,
        .remove =       uda1380_remove,
        .suspend =      uda1380_suspend,
        .resume =       uda1380_resume,
        .read =         uda1380_read_reg_cache,
        .write =        uda1380_write,
        .set_bias_level = uda1380_set_bias_level,
        .reg_cache_size = ARRAY_SIZE(uda1380_reg),
        .reg_word_size = sizeof(u16),
        .reg_cache_default = uda1380_reg,
        .reg_cache_step = 1,

        .controls = uda1380_snd_controls,
        .num_controls = ARRAY_SIZE(uda1380_snd_controls),
        .dapm_widgets = uda1380_dapm_widgets,
        .num_dapm_widgets = ARRAY_SIZE(uda1380_dapm_widgets),
        .dapm_routes = uda1380_dapm_routes,
        .num_dapm_routes = ARRAY_SIZE(uda1380_dapm_routes),
};

#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int uda1380_i2c_probe(struct i2c_client *i2c,
                             const struct i2c_device_id *id)
{
        struct uda1380_priv *uda1380;
        int ret;

        uda1380 = devm_kzalloc(&i2c->dev, sizeof(struct uda1380_priv),
                               GFP_KERNEL);
        if (uda1380 == NULL)
                return -ENOMEM;

        i2c_set_clientdata(i2c, uda1380);
        uda1380->control_data = i2c;

        ret =  snd_soc_register_codec(&i2c->dev,
                        &soc_codec_dev_uda1380, uda1380_dai, ARRAY_SIZE(uda1380_dai));
        return ret;
}

static int uda1380_i2c_remove(struct i2c_client *i2c)
{
        snd_soc_unregister_codec(&i2c->dev);
        return 0;
}

static const struct i2c_device_id uda1380_i2c_id[] = {
        { "uda1380", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, uda1380_i2c_id);

static struct i2c_driver uda1380_i2c_driver = {
        .driver = {
                .name =  "uda1380-codec",
                .owner = THIS_MODULE,
        },
        .probe =    uda1380_i2c_probe,
        .remove =   uda1380_i2c_remove,
        .id_table = uda1380_i2c_id,
};
#endif

static int __init uda1380_modinit(void)
{
        int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
        ret = i2c_add_driver(&uda1380_i2c_driver);
        if (ret != 0)
                pr_err("Failed to register UDA1380 I2C driver: %d\n", ret);
#endif
        return ret;
}
module_init(uda1380_modinit);

static void __exit uda1380_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
        i2c_del_driver(&uda1380_i2c_driver);
#endif
}
module_exit(uda1380_exit);

MODULE_AUTHOR("Giorgio Padrin");
MODULE_DESCRIPTION("Audio support for codec Philips UDA1380");
MODULE_LICENSE("GPL");