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twl6040.c

/*
 * ALSA SoC TWL6040 codec driver
 *
 * Author:   Misael Lopez Cruz <x0052729@ti.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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, 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/gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/i2c/twl.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 <sound/tlv.h>

#include "twl6040.h"

#define TWL6040_RATES    (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
#define TWL6040_FORMATS  (SNDRV_PCM_FMTBIT_S32_LE)

/* codec private data */
struct twl6040_data {
      struct snd_soc_codec codec;
      int audpwron;
      int naudint;
      int codec_powered;
      int pll;
      int non_lp;
      unsigned int sysclk;
      struct snd_pcm_hw_constraint_list *sysclk_constraints;
      struct completion ready;
};

/*
 * twl6040 register cache & default register settings
 */
static const u8 twl6040_reg[TWL6040_CACHEREGNUM] = {
      0x00, /* not used       0x00  */
      0x4B, /* TWL6040_ASICID (ro)  0x01  */
      0x00, /* TWL6040_ASICREV (ro) 0x02  */
      0x00, /* TWL6040_INTID        0x03  */
      0x00, /* TWL6040_INTMR        0x04  */
      0x00, /* TWL6040_NCPCTRL      0x05  */
      0x00, /* TWL6040_LDOCTL       0x06  */
      0x60, /* TWL6040_HPPLLCTL     0x07  */
      0x00, /* TWL6040_LPPLLCTL     0x08  */
      0x4A, /* TWL6040_LPPLLDIV     0x09  */
      0x00, /* TWL6040_AMICBCTL     0x0A  */
      0x00, /* TWL6040_DMICBCTL     0x0B  */
      0x18, /* TWL6040_MICLCTL      0x0C  - No input selected on Left Mic */
      0x18, /* TWL6040_MICRCTL      0x0D  - No input selected on Right Mic */
      0x00, /* TWL6040_MICGAIN      0x0E  */
      0x1B, /* TWL6040_LINEGAIN     0x0F  */
      0x00, /* TWL6040_HSLCTL       0x10  */
      0x00, /* TWL6040_HSRCTL       0x11  */
      0x00, /* TWL6040_HSGAIN       0x12  */
      0x00, /* TWL6040_EARCTL       0x13  */
      0x00, /* TWL6040_HFLCTL       0x14  */
      0x00, /* TWL6040_HFLGAIN      0x15  */
      0x00, /* TWL6040_HFRCTL       0x16  */
      0x00, /* TWL6040_HFRGAIN      0x17  */
      0x00, /* TWL6040_VIBCTLL      0x18  */
      0x00, /* TWL6040_VIBDATL      0x19  */
      0x00, /* TWL6040_VIBCTLR      0x1A  */
      0x00, /* TWL6040_VIBDATR      0x1B  */
      0x00, /* TWL6040_HKCTL1       0x1C  */
      0x00, /* TWL6040_HKCTL2       0x1D  */
      0x00, /* TWL6040_GPOCTL       0x1E  */
      0x00, /* TWL6040_ALB          0x1F  */
      0x00, /* TWL6040_DLB          0x20  */
      0x00, /* not used       0x21  */
      0x00, /* not used       0x22  */
      0x00, /* not used       0x23  */
      0x00, /* not used       0x24  */
      0x00, /* not used       0x25  */
      0x00, /* not used       0x26  */
      0x00, /* not used       0x27  */
      0x00, /* TWL6040_TRIM1        0x28  */
      0x00, /* TWL6040_TRIM2        0x29  */
      0x00, /* TWL6040_TRIM3        0x2A  */
      0x00, /* TWL6040_HSOTRIM      0x2B  */
      0x00, /* TWL6040_HFOTRIM      0x2C  */
      0x09, /* TWL6040_ACCCTL       0x2D  */
      0x00, /* TWL6040_STATUS (ro)  0x2E  */
};

/*
 * twl6040 vio/gnd registers:
 * registers under vio/gnd supply can be accessed
 * before the power-up sequence, after NRESPWRON goes high
 */
static const int twl6040_vio_reg[TWL6040_VIOREGNUM] = {
      TWL6040_REG_ASICID,
      TWL6040_REG_ASICREV,
      TWL6040_REG_INTID,
      TWL6040_REG_INTMR,
      TWL6040_REG_NCPCTL,
      TWL6040_REG_LDOCTL,
      TWL6040_REG_AMICBCTL,
      TWL6040_REG_DMICBCTL,
      TWL6040_REG_HKCTL1,
      TWL6040_REG_HKCTL2,
      TWL6040_REG_GPOCTL,
      TWL6040_REG_TRIM1,
      TWL6040_REG_TRIM2,
      TWL6040_REG_TRIM3,
      TWL6040_REG_HSOTRIM,
      TWL6040_REG_HFOTRIM,
      TWL6040_REG_ACCCTL,
      TWL6040_REG_STATUS,
};

/*
 * twl6040 vdd/vss registers:
 * registers under vdd/vss supplies can only be accessed
 * after the power-up sequence
 */
static const int twl6040_vdd_reg[TWL6040_VDDREGNUM] = {
      TWL6040_REG_HPPLLCTL,
      TWL6040_REG_LPPLLCTL,
      TWL6040_REG_LPPLLDIV,
      TWL6040_REG_MICLCTL,
      TWL6040_REG_MICRCTL,
      TWL6040_REG_MICGAIN,
      TWL6040_REG_LINEGAIN,
      TWL6040_REG_HSLCTL,
      TWL6040_REG_HSRCTL,
      TWL6040_REG_HSGAIN,
      TWL6040_REG_EARCTL,
      TWL6040_REG_HFLCTL,
      TWL6040_REG_HFLGAIN,
      TWL6040_REG_HFRCTL,
      TWL6040_REG_HFRGAIN,
      TWL6040_REG_VIBCTLL,
      TWL6040_REG_VIBDATL,
      TWL6040_REG_VIBCTLR,
      TWL6040_REG_VIBDATR,
      TWL6040_REG_ALB,
      TWL6040_REG_DLB,
};

/*
 * read twl6040 register cache
 */
static inline unsigned int twl6040_read_reg_cache(struct snd_soc_codec *codec,
                                    unsigned int reg)
{
      u8 *cache = codec->reg_cache;

      if (reg >= TWL6040_CACHEREGNUM)
            return -EIO;

      return cache[reg];
}

/*
 * write twl6040 register cache
 */
static inline void twl6040_write_reg_cache(struct snd_soc_codec *codec,
                                    u8 reg, u8 value)
{
      u8 *cache = codec->reg_cache;

      if (reg >= TWL6040_CACHEREGNUM)
            return;
      cache[reg] = value;
}

/*
 * read from twl6040 hardware register
 */
static int twl6040_read_reg_volatile(struct snd_soc_codec *codec,
                  unsigned int reg)
{
      u8 value;

      if (reg >= TWL6040_CACHEREGNUM)
            return -EIO;

      twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &value, reg);
      twl6040_write_reg_cache(codec, reg, value);

      return value;
}

/*
 * write to the twl6040 register space
 */
static int twl6040_write(struct snd_soc_codec *codec,
                  unsigned int reg, unsigned int value)
{
      if (reg >= TWL6040_CACHEREGNUM)
            return -EIO;

      twl6040_write_reg_cache(codec, reg, value);
      return twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, value, reg);
}

static void twl6040_init_vio_regs(struct snd_soc_codec *codec)
{
      u8 *cache = codec->reg_cache;
      int reg, i;

      /* allow registers to be accessed by i2c */
      twl6040_write(codec, TWL6040_REG_ACCCTL, cache[TWL6040_REG_ACCCTL]);

      for (i = 0; i < TWL6040_VIOREGNUM; i++) {
            reg = twl6040_vio_reg[i];
            /* skip read-only registers (ASICID, ASICREV, STATUS) */
            switch (reg) {
            case TWL6040_REG_ASICID:
            case TWL6040_REG_ASICREV:
            case TWL6040_REG_STATUS:
                  continue;
            default:
                  break;
            }
            twl6040_write(codec, reg, cache[reg]);
      }
}

static void twl6040_init_vdd_regs(struct snd_soc_codec *codec)
{
      u8 *cache = codec->reg_cache;
      int reg, i;

      for (i = 0; i < TWL6040_VDDREGNUM; i++) {
            reg = twl6040_vdd_reg[i];
            twl6040_write(codec, reg, cache[reg]);
      }
}

/* twl6040 codec manual power-up sequence */
static void twl6040_power_up(struct snd_soc_codec *codec)
{
      u8 ncpctl, ldoctl, lppllctl, accctl;

      ncpctl = twl6040_read_reg_cache(codec, TWL6040_REG_NCPCTL);
      ldoctl = twl6040_read_reg_cache(codec, TWL6040_REG_LDOCTL);
      lppllctl = twl6040_read_reg_cache(codec, TWL6040_REG_LPPLLCTL);
      accctl = twl6040_read_reg_cache(codec, TWL6040_REG_ACCCTL);

      /* enable reference system */
      ldoctl |= TWL6040_REFENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      msleep(10);
      /* enable internal oscillator */
      ldoctl |= TWL6040_OSCENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      udelay(10);
      /* enable high-side ldo */
      ldoctl |= TWL6040_HSLDOENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      udelay(244);
      /* enable negative charge pump */
      ncpctl |= TWL6040_NCPENA | TWL6040_NCPOPEN;
      twl6040_write(codec, TWL6040_REG_NCPCTL, ncpctl);
      udelay(488);
      /* enable low-side ldo */
      ldoctl |= TWL6040_LSLDOENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      udelay(244);
      /* enable low-power pll */
      lppllctl |= TWL6040_LPLLENA;
      twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);
      /* reset state machine */
      accctl |= TWL6040_RESETSPLIT;
      twl6040_write(codec, TWL6040_REG_ACCCTL, accctl);
      mdelay(5);
      accctl &= ~TWL6040_RESETSPLIT;
      twl6040_write(codec, TWL6040_REG_ACCCTL, accctl);
      /* disable internal oscillator */
      ldoctl &= ~TWL6040_OSCENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
}

/* twl6040 codec manual power-down sequence */
static void twl6040_power_down(struct snd_soc_codec *codec)
{
      u8 ncpctl, ldoctl, lppllctl, accctl;

      ncpctl = twl6040_read_reg_cache(codec, TWL6040_REG_NCPCTL);
      ldoctl = twl6040_read_reg_cache(codec, TWL6040_REG_LDOCTL);
      lppllctl = twl6040_read_reg_cache(codec, TWL6040_REG_LPPLLCTL);
      accctl = twl6040_read_reg_cache(codec, TWL6040_REG_ACCCTL);

      /* enable internal oscillator */
      ldoctl |= TWL6040_OSCENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      udelay(10);
      /* disable low-power pll */
      lppllctl &= ~TWL6040_LPLLENA;
      twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);
      /* disable low-side ldo */
      ldoctl &= ~TWL6040_LSLDOENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      udelay(244);
      /* disable negative charge pump */
      ncpctl &= ~(TWL6040_NCPENA | TWL6040_NCPOPEN);
      twl6040_write(codec, TWL6040_REG_NCPCTL, ncpctl);
      udelay(488);
      /* disable high-side ldo */
      ldoctl &= ~TWL6040_HSLDOENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      udelay(244);
      /* disable internal oscillator */
      ldoctl &= ~TWL6040_OSCENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      /* disable reference system */
      ldoctl &= ~TWL6040_REFENA;
      twl6040_write(codec, TWL6040_REG_LDOCTL, ldoctl);
      msleep(10);
}

/* set headset dac and driver power mode */
static int headset_power_mode(struct snd_soc_codec *codec, int high_perf)
{
      int hslctl, hsrctl;
      int mask = TWL6040_HSDRVMODEL | TWL6040_HSDACMODEL;

      hslctl = twl6040_read_reg_cache(codec, TWL6040_REG_HSLCTL);
      hsrctl = twl6040_read_reg_cache(codec, TWL6040_REG_HSRCTL);

      if (high_perf) {
            hslctl &= ~mask;
            hsrctl &= ~mask;
      } else {
            hslctl |= mask;
            hsrctl |= mask;
      }

      twl6040_write(codec, TWL6040_REG_HSLCTL, hslctl);
      twl6040_write(codec, TWL6040_REG_HSRCTL, hsrctl);

      return 0;
}

static int twl6040_power_mode_event(struct snd_soc_dapm_widget *w,
                  struct snd_kcontrol *kcontrol, int event)
{
      struct snd_soc_codec *codec = w->codec;
      struct twl6040_data *priv = codec->private_data;

      if (SND_SOC_DAPM_EVENT_ON(event))
            priv->non_lp++;
      else
            priv->non_lp--;

      return 0;
}

/* audio interrupt handler */
static irqreturn_t twl6040_naudint_handler(int irq, void *data)
{
      struct snd_soc_codec *codec = data;
      struct twl6040_data *priv = codec->private_data;
      u8 intid;

      twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &intid, TWL6040_REG_INTID);

      switch (intid) {
      case TWL6040_THINT:
            dev_alert(codec->dev, "die temp over-limit detection\n");
            break;
      case TWL6040_PLUGINT:
      case TWL6040_UNPLUGINT:
      case TWL6040_HOOKINT:
            break;
      case TWL6040_HFINT:
            dev_alert(codec->dev, "hf drivers over current detection\n");
            break;
      case TWL6040_VIBINT:
            dev_alert(codec->dev, "vib drivers over current detection\n");
            break;
      case TWL6040_READYINT:
            complete(&priv->ready);
            break;
      default:
            dev_err(codec->dev, "unknown audio interrupt %d\n", intid);
            break;
      }

      return IRQ_HANDLED;
}

/*
 * MICATT volume control:
 * from -6 to 0 dB in 6 dB steps
 */
static DECLARE_TLV_DB_SCALE(mic_preamp_tlv, -600, 600, 0);

/*
 * MICGAIN volume control:
 * from 6 to 30 dB in 6 dB steps
 */
static DECLARE_TLV_DB_SCALE(mic_amp_tlv, 600, 600, 0);

/*
 * HSGAIN volume control:
 * from -30 to 0 dB in 2 dB steps
 */
static DECLARE_TLV_DB_SCALE(hs_tlv, -3000, 200, 0);

/*
 * HFGAIN volume control:
 * from -52 to 6 dB in 2 dB steps
 */
static DECLARE_TLV_DB_SCALE(hf_tlv, -5200, 200, 0);

/* Left analog microphone selection */
static const char *twl6040_amicl_texts[] =
      {"Headset Mic", "Main Mic", "Aux/FM Left", "Off"};

/* Right analog microphone selection */
static const char *twl6040_amicr_texts[] =
      {"Headset Mic", "Sub Mic", "Aux/FM Right", "Off"};

static const struct soc_enum twl6040_enum[] = {
      SOC_ENUM_SINGLE(TWL6040_REG_MICLCTL, 3, 3, twl6040_amicl_texts),
      SOC_ENUM_SINGLE(TWL6040_REG_MICRCTL, 3, 3, twl6040_amicr_texts),
};

static const struct snd_kcontrol_new amicl_control =
      SOC_DAPM_ENUM("Route", twl6040_enum[0]);

static const struct snd_kcontrol_new amicr_control =
      SOC_DAPM_ENUM("Route", twl6040_enum[1]);

/* Headset DAC playback switches */
static const struct snd_kcontrol_new hsdacl_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HSLCTL, 5, 1, 0);

static const struct snd_kcontrol_new hsdacr_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HSRCTL, 5, 1, 0);

/* Handsfree DAC playback switches */
static const struct snd_kcontrol_new hfdacl_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HFLCTL, 2, 1, 0);

static const struct snd_kcontrol_new hfdacr_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HFRCTL, 2, 1, 0);

/* Headset driver switches */
static const struct snd_kcontrol_new hsl_driver_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HSLCTL, 2, 1, 0);

static const struct snd_kcontrol_new hsr_driver_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HSRCTL, 2, 1, 0);

/* Handsfree driver switches */
static const struct snd_kcontrol_new hfl_driver_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HFLCTL, 4, 1, 0);

static const struct snd_kcontrol_new hfr_driver_switch_controls =
      SOC_DAPM_SINGLE("Switch", TWL6040_REG_HFRCTL, 4, 1, 0);

static const struct snd_kcontrol_new twl6040_snd_controls[] = {
      /* Capture gains */
      SOC_DOUBLE_TLV("Capture Preamplifier Volume",
            TWL6040_REG_MICGAIN, 6, 7, 1, 1, mic_preamp_tlv),
      SOC_DOUBLE_TLV("Capture Volume",
            TWL6040_REG_MICGAIN, 0, 3, 4, 0, mic_amp_tlv),

      /* Playback gains */
      SOC_DOUBLE_TLV("Headset Playback Volume",
            TWL6040_REG_HSGAIN, 0, 4, 0xF, 1, hs_tlv),
      SOC_DOUBLE_R_TLV("Handsfree Playback Volume",
            TWL6040_REG_HFLGAIN, TWL6040_REG_HFRGAIN, 0, 0x1D, 1, hf_tlv),

};

static const struct snd_soc_dapm_widget twl6040_dapm_widgets[] = {
      /* Inputs */
      SND_SOC_DAPM_INPUT("MAINMIC"),
      SND_SOC_DAPM_INPUT("HSMIC"),
      SND_SOC_DAPM_INPUT("SUBMIC"),
      SND_SOC_DAPM_INPUT("AFML"),
      SND_SOC_DAPM_INPUT("AFMR"),

      /* Outputs */
      SND_SOC_DAPM_OUTPUT("HSOL"),
      SND_SOC_DAPM_OUTPUT("HSOR"),
      SND_SOC_DAPM_OUTPUT("HFL"),
      SND_SOC_DAPM_OUTPUT("HFR"),

      /* Analog input muxes for the capture amplifiers */
      SND_SOC_DAPM_MUX("Analog Left Capture Route",
                  SND_SOC_NOPM, 0, 0, &amicl_control),
      SND_SOC_DAPM_MUX("Analog Right Capture Route",
                  SND_SOC_NOPM, 0, 0, &amicr_control),

      /* Analog capture PGAs */
      SND_SOC_DAPM_PGA("MicAmpL",
                  TWL6040_REG_MICLCTL, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("MicAmpR",
                  TWL6040_REG_MICRCTL, 0, 0, NULL, 0),

      /* ADCs */
      SND_SOC_DAPM_ADC("ADC Left", "Left Front Capture",
                  TWL6040_REG_MICLCTL, 2, 0),
      SND_SOC_DAPM_ADC("ADC Right", "Right Front Capture",
                  TWL6040_REG_MICRCTL, 2, 0),

      /* Microphone bias */
      SND_SOC_DAPM_MICBIAS("Headset Mic Bias",
                  TWL6040_REG_AMICBCTL, 0, 0),
      SND_SOC_DAPM_MICBIAS("Main Mic Bias",
                  TWL6040_REG_AMICBCTL, 4, 0),
      SND_SOC_DAPM_MICBIAS("Digital Mic1 Bias",
                  TWL6040_REG_DMICBCTL, 0, 0),
      SND_SOC_DAPM_MICBIAS("Digital Mic2 Bias",
                  TWL6040_REG_DMICBCTL, 4, 0),

      /* DACs */
      SND_SOC_DAPM_DAC("HSDAC Left", "Headset Playback",
                  TWL6040_REG_HSLCTL, 0, 0),
      SND_SOC_DAPM_DAC("HSDAC Right", "Headset Playback",
                  TWL6040_REG_HSRCTL, 0, 0),
      SND_SOC_DAPM_DAC_E("HFDAC Left", "Handsfree Playback",
                  TWL6040_REG_HFLCTL, 0, 0,
                  twl6040_power_mode_event,
                  SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
      SND_SOC_DAPM_DAC_E("HFDAC Right", "Handsfree Playback",
                  TWL6040_REG_HFRCTL, 0, 0,
                  twl6040_power_mode_event,
                  SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),

      /* Analog playback switches */
      SND_SOC_DAPM_SWITCH("HSDAC Left Playback",
                  SND_SOC_NOPM, 0, 0, &hsdacl_switch_controls),
      SND_SOC_DAPM_SWITCH("HSDAC Right Playback",
                  SND_SOC_NOPM, 0, 0, &hsdacr_switch_controls),
      SND_SOC_DAPM_SWITCH("HFDAC Left Playback",
                  SND_SOC_NOPM, 0, 0, &hfdacl_switch_controls),
      SND_SOC_DAPM_SWITCH("HFDAC Right Playback",
                  SND_SOC_NOPM, 0, 0, &hfdacr_switch_controls),

      SND_SOC_DAPM_SWITCH("Headset Left Driver",
                  SND_SOC_NOPM, 0, 0, &hsl_driver_switch_controls),
      SND_SOC_DAPM_SWITCH("Headset Right Driver",
                  SND_SOC_NOPM, 0, 0, &hsr_driver_switch_controls),
      SND_SOC_DAPM_SWITCH_E("Handsfree Left Driver",
                  SND_SOC_NOPM, 0, 0, &hfl_driver_switch_controls,
                  twl6040_power_mode_event,
                  SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
      SND_SOC_DAPM_SWITCH_E("Handsfree Right Driver",
                  SND_SOC_NOPM, 0, 0, &hfr_driver_switch_controls,
                  twl6040_power_mode_event,
                  SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),

      /* Analog playback PGAs */
      SND_SOC_DAPM_PGA("HFDAC Left PGA",
                  TWL6040_REG_HFLCTL, 1, 0, NULL, 0),
      SND_SOC_DAPM_PGA("HFDAC Right PGA",
                  TWL6040_REG_HFRCTL, 1, 0, NULL, 0),

};

static const struct snd_soc_dapm_route intercon[] = {
      /* Capture path */
      {"Analog Left Capture Route", "Headset Mic", "HSMIC"},
      {"Analog Left Capture Route", "Main Mic", "MAINMIC"},
      {"Analog Left Capture Route", "Aux/FM Left", "AFML"},

      {"Analog Right Capture Route", "Headset Mic", "HSMIC"},
      {"Analog Right Capture Route", "Sub Mic", "SUBMIC"},
      {"Analog Right Capture Route", "Aux/FM Right", "AFMR"},

      {"MicAmpL", NULL, "Analog Left Capture Route"},
      {"MicAmpR", NULL, "Analog Right Capture Route"},

      {"ADC Left", NULL, "MicAmpL"},
      {"ADC Right", NULL, "MicAmpR"},

      /* Headset playback path */
      {"HSDAC Left Playback", "Switch", "HSDAC Left"},
      {"HSDAC Right Playback", "Switch", "HSDAC Right"},

      {"Headset Left Driver", "Switch", "HSDAC Left Playback"},
      {"Headset Right Driver", "Switch", "HSDAC Right Playback"},

      {"HSOL", NULL, "Headset Left Driver"},
      {"HSOR", NULL, "Headset Right Driver"},

      /* Handsfree playback path */
      {"HFDAC Left Playback", "Switch", "HFDAC Left"},
      {"HFDAC Right Playback", "Switch", "HFDAC Right"},

      {"HFDAC Left PGA", NULL, "HFDAC Left Playback"},
      {"HFDAC Right PGA", NULL, "HFDAC Right Playback"},

      {"Handsfree Left Driver", "Switch", "HFDAC Left PGA"},
      {"Handsfree Right Driver", "Switch", "HFDAC Right PGA"},

      {"HFL", NULL, "Handsfree Left Driver"},
      {"HFR", NULL, "Handsfree Right Driver"},
};

static int twl6040_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, twl6040_dapm_widgets,
                         ARRAY_SIZE(twl6040_dapm_widgets));

      snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

      snd_soc_dapm_new_widgets(codec);

      return 0;
}

static int twl6040_power_up_completion(struct snd_soc_codec *codec,
                              int naudint)
{
      struct twl6040_data *priv = codec->private_data;
      int time_left;
      u8 intid;

      time_left = wait_for_completion_timeout(&priv->ready,
                        msecs_to_jiffies(48));

      if (!time_left) {
            twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &intid,
                                          TWL6040_REG_INTID);
            if (!(intid & TWL6040_READYINT)) {
                  dev_err(codec->dev, "timeout waiting for READYINT\n");
                  return -ETIMEDOUT;
            }
      }

      priv->codec_powered = 1;

      return 0;
}

static int twl6040_set_bias_level(struct snd_soc_codec *codec,
                        enum snd_soc_bias_level level)
{
      struct twl6040_data *priv = codec->private_data;
      int audpwron = priv->audpwron;
      int naudint = priv->naudint;
      int ret;

      switch (level) {
      case SND_SOC_BIAS_ON:
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            if (priv->codec_powered)
                  break;

            if (gpio_is_valid(audpwron)) {
                  /* use AUDPWRON line */
                  gpio_set_value(audpwron, 1);

                  /* wait for power-up completion */
                  ret = twl6040_power_up_completion(codec, naudint);
                  if (ret)
                        return ret;

                  /* sync registers updated during power-up sequence */
                  twl6040_read_reg_volatile(codec, TWL6040_REG_NCPCTL);
                  twl6040_read_reg_volatile(codec, TWL6040_REG_LDOCTL);
                  twl6040_read_reg_volatile(codec, TWL6040_REG_LPPLLCTL);
            } else {
                  /* use manual power-up sequence */
                  twl6040_power_up(codec);
                  priv->codec_powered = 1;
            }

            /* initialize vdd/vss registers with reg_cache */
            twl6040_init_vdd_regs(codec);
            break;
      case SND_SOC_BIAS_OFF:
            if (!priv->codec_powered)
                  break;

            if (gpio_is_valid(audpwron)) {
                  /* use AUDPWRON line */
                  gpio_set_value(audpwron, 0);

                  /* power-down sequence latency */
                  udelay(500);

                  /* sync registers updated during power-down sequence */
                  twl6040_read_reg_volatile(codec, TWL6040_REG_NCPCTL);
                  twl6040_read_reg_volatile(codec, TWL6040_REG_LDOCTL);
                  twl6040_write_reg_cache(codec, TWL6040_REG_LPPLLCTL,
                                    0x00);
            } else {
                  /* use manual power-down sequence */
                  twl6040_power_down(codec);
            }

            priv->codec_powered = 0;
            break;
      }

      codec->bias_level = level;

      return 0;
}

/* set of rates for each pll: low-power and high-performance */

static unsigned int lp_rates[] = {
      88200,
      96000,
};

static struct snd_pcm_hw_constraint_list lp_constraints = {
      .count      = ARRAY_SIZE(lp_rates),
      .list = lp_rates,
};

static unsigned int hp_rates[] = {
      96000,
};

static struct snd_pcm_hw_constraint_list hp_constraints = {
      .count      = ARRAY_SIZE(hp_rates),
      .list = hp_rates,
};

static int twl6040_startup(struct snd_pcm_substream *substream,
                  struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct twl6040_data *priv = codec->private_data;

      if (!priv->sysclk) {
            dev_err(codec->dev,
                  "no mclk configured, call set_sysclk() on init\n");
            return -EINVAL;
      }

      /*
       * capture is not supported at 17.64 MHz,
       * it's reserved for headset low-power playback scenario
       */
      if ((priv->sysclk == 17640000) && substream->stream) {
            dev_err(codec->dev,
                  "capture mode is not supported at %dHz\n",
                  priv->sysclk);
            return -EINVAL;
      }

      snd_pcm_hw_constraint_list(substream->runtime, 0,
                        SNDRV_PCM_HW_PARAM_RATE,
                        priv->sysclk_constraints);

      return 0;
}

static int twl6040_hw_params(struct snd_pcm_substream *substream,
                  struct snd_pcm_hw_params *params,
                  struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct twl6040_data *priv = codec->private_data;
      u8 lppllctl;
      int rate;

      /* nothing to do for high-perf pll, it supports only 48 kHz */
      if (priv->pll == TWL6040_HPPLL_ID)
            return 0;

      lppllctl = twl6040_read_reg_cache(codec, TWL6040_REG_LPPLLCTL);

      rate = params_rate(params);
      switch (rate) {
      case 88200:
            lppllctl |= TWL6040_LPLLFIN;
            priv->sysclk = 17640000;
            break;
      case 96000:
            lppllctl &= ~TWL6040_LPLLFIN;
            priv->sysclk = 19200000;
            break;
      default:
            dev_err(codec->dev, "unsupported rate %d\n", rate);
            return -EINVAL;
      }

      twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);

      return 0;
}

static int twl6040_trigger(struct snd_pcm_substream *substream,
                  int cmd, struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct twl6040_data *priv = codec->private_data;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
            /*
             * low-power playback mode is restricted
             * for headset path only
             */
            if ((priv->sysclk == 17640000) && priv->non_lp) {
                  dev_err(codec->dev,
                        "some enabled paths aren't supported at %dHz\n",
                        priv->sysclk);
                  return -EPERM;
            }
            break;
      default:
            break;
      }

      return 0;
}

static int twl6040_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 twl6040_data *priv = codec->private_data;
      u8 hppllctl, lppllctl;

      hppllctl = twl6040_read_reg_cache(codec, TWL6040_REG_HPPLLCTL);
      lppllctl = twl6040_read_reg_cache(codec, TWL6040_REG_LPPLLCTL);

      switch (clk_id) {
      case TWL6040_SYSCLK_SEL_LPPLL:
            switch (freq) {
            case 32768:
                  /* headset dac and driver must be in low-power mode */
                  headset_power_mode(codec, 0);

                  /* clk32k input requires low-power pll */
                  lppllctl |= TWL6040_LPLLENA;
                  twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);
                  mdelay(5);
                  lppllctl &= ~TWL6040_HPLLSEL;
                  twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);
                  hppllctl &= ~TWL6040_HPLLENA;
                  twl6040_write(codec, TWL6040_REG_HPPLLCTL, hppllctl);
                  break;
            default:
                  dev_err(codec->dev, "unknown mclk freq %d\n", freq);
                  return -EINVAL;
            }

            /* lppll divider */
            switch (priv->sysclk) {
            case 17640000:
                  lppllctl |= TWL6040_LPLLFIN;
                  break;
            case 19200000:
                  lppllctl &= ~TWL6040_LPLLFIN;
                  break;
            default:
                  /* sysclk not yet configured */
                  lppllctl &= ~TWL6040_LPLLFIN;
                  priv->sysclk = 19200000;
                  break;
            }

            twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);

            priv->pll = TWL6040_LPPLL_ID;
            priv->sysclk_constraints = &lp_constraints;
            break;
      case TWL6040_SYSCLK_SEL_HPPLL:
            hppllctl &= ~TWL6040_MCLK_MSK;

            switch (freq) {
            case 12000000:
                  /* mclk input, pll enabled */
                  hppllctl |= TWL6040_MCLK_12000KHZ |
                            TWL6040_HPLLSQRBP |
                            TWL6040_HPLLENA;
                  break;
            case 19200000:
                  /* mclk input, pll disabled */
                  hppllctl |= TWL6040_MCLK_19200KHZ |
                            TWL6040_HPLLSQRBP |
                            TWL6040_HPLLBP;
                  break;
            case 26000000:
                  /* mclk input, pll enabled */
                  hppllctl |= TWL6040_MCLK_26000KHZ |
                            TWL6040_HPLLSQRBP |
                            TWL6040_HPLLENA;
                  break;
            case 38400000:
                  /* clk slicer, pll disabled */
                  hppllctl |= TWL6040_MCLK_38400KHZ |
                            TWL6040_HPLLSQRENA |
                            TWL6040_HPLLBP;
                  break;
            default:
                  dev_err(codec->dev, "unknown mclk freq %d\n", freq);
                  return -EINVAL;
            }

            /* headset dac and driver must be in high-performance mode */
            headset_power_mode(codec, 1);

            twl6040_write(codec, TWL6040_REG_HPPLLCTL, hppllctl);
            udelay(500);
            lppllctl |= TWL6040_HPLLSEL;
            twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);
            lppllctl &= ~TWL6040_LPLLENA;
            twl6040_write(codec, TWL6040_REG_LPPLLCTL, lppllctl);

            /* high-performance pll can provide only 19.2 MHz */
            priv->pll = TWL6040_HPPLL_ID;
            priv->sysclk = 19200000;
            priv->sysclk_constraints = &hp_constraints;
            break;
      default:
            dev_err(codec->dev, "unknown clk_id %d\n", clk_id);
            return -EINVAL;
      }

      return 0;
}

static struct snd_soc_dai_ops twl6040_dai_ops = {
      .startup    = twl6040_startup,
      .hw_params  = twl6040_hw_params,
      .trigger    = twl6040_trigger,
      .set_sysclk = twl6040_set_dai_sysclk,
};

struct snd_soc_dai twl6040_dai = {
      .name = "twl6040",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 4,
            .rates = TWL6040_RATES,
            .formats = TWL6040_FORMATS,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = TWL6040_RATES,
            .formats = TWL6040_FORMATS,
      },
      .ops = &twl6040_dai_ops,
};
EXPORT_SYMBOL_GPL(twl6040_dai);

#ifdef CONFIG_PM
static int twl6040_suspend(struct platform_device *pdev, pm_message_t state)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      twl6040_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

static int twl6040_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      twl6040_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      twl6040_set_bias_level(codec, codec->suspend_bias_level);

      return 0;
}
#else
#define twl6040_suspend NULL
#define twl6040_resume NULL
#endif

static struct snd_soc_codec *twl6040_codec;

static int twl6040_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      int ret = 0;

      BUG_ON(!twl6040_codec);

      codec = twl6040_codec;
      socdev->card->codec = codec;

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            dev_err(&pdev->dev, "failed to create pcms\n");
            return ret;
      }

      snd_soc_add_controls(codec, twl6040_snd_controls,
                        ARRAY_SIZE(twl6040_snd_controls));
      twl6040_add_widgets(codec);

      if (ret < 0) {
            dev_err(&pdev->dev, "failed to register card\n");
            goto card_err;
      }

      return ret;

card_err:
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
      return ret;
}

static int twl6040_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      twl6040_set_bias_level(codec, SND_SOC_BIAS_OFF);
      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);
      kfree(codec);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_twl6040 = {
      .probe = twl6040_probe,
      .remove = twl6040_remove,
      .suspend = twl6040_suspend,
      .resume = twl6040_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_twl6040);

static int __devinit twl6040_codec_probe(struct platform_device *pdev)
{
      struct twl4030_codec_data *twl_codec = pdev->dev.platform_data;
      struct snd_soc_codec *codec;
      struct twl6040_data *priv;
      int audpwron, naudint;
      int ret = 0;

      priv = kzalloc(sizeof(struct twl6040_data), GFP_KERNEL);
      if (priv == NULL)
            return -ENOMEM;

      if (twl_codec) {
            audpwron = twl_codec->audpwron_gpio;
            naudint = twl_codec->naudint_irq;
      } else {
            audpwron = -EINVAL;
            naudint = 0;
      }

      priv->audpwron = audpwron;
      priv->naudint = naudint;

      codec = &priv->codec;
      codec->dev = &pdev->dev;
      twl6040_dai.dev = &pdev->dev;

      codec->name = "twl6040";
      codec->owner = THIS_MODULE;
      codec->read = twl6040_read_reg_cache;
      codec->write = twl6040_write;
      codec->set_bias_level = twl6040_set_bias_level;
      codec->private_data = priv;
      codec->dai = &twl6040_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = ARRAY_SIZE(twl6040_reg);
      codec->reg_cache = kmemdup(twl6040_reg, sizeof(twl6040_reg),
                              GFP_KERNEL);
      if (codec->reg_cache == NULL) {
            ret = -ENOMEM;
            goto cache_err;
      }

      mutex_init(&codec->mutex);
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);
      init_completion(&priv->ready);

      if (gpio_is_valid(audpwron)) {
            ret = gpio_request(audpwron, "audpwron");
            if (ret)
                  goto gpio1_err;

            ret = gpio_direction_output(audpwron, 0);
            if (ret)
                  goto gpio2_err;

            priv->codec_powered = 0;
      }

      if (naudint) {
            /* audio interrupt */
            ret = request_threaded_irq(naudint, NULL,
                        twl6040_naudint_handler,
                        IRQF_TRIGGER_LOW | IRQF_ONESHOT,
                        "twl6040_codec", codec);
            if (ret)
                  goto gpio2_err;
      } else {
            if (gpio_is_valid(audpwron)) {
                  /* enable only codec ready interrupt */
                  twl6040_write_reg_cache(codec, TWL6040_REG_INTMR,
                              ~TWL6040_READYMSK & TWL6040_ALLINT_MSK);
            } else {
                  /* no interrupts at all */
                  twl6040_write_reg_cache(codec, TWL6040_REG_INTMR,
                                    TWL6040_ALLINT_MSK);
            }
      }

      /* init vio registers */
      twl6040_init_vio_regs(codec);

      /* power on device */
      ret = twl6040_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      if (ret)
            goto irq_err;

      ret = snd_soc_register_codec(codec);
      if (ret)
            goto reg_err;

      twl6040_codec = codec;

      ret = snd_soc_register_dai(&twl6040_dai);
      if (ret)
            goto dai_err;

      return 0;

dai_err:
      snd_soc_unregister_codec(codec);
      twl6040_codec = NULL;
reg_err:
      twl6040_set_bias_level(codec, SND_SOC_BIAS_OFF);
irq_err:
      if (naudint)
            free_irq(naudint, codec);
gpio2_err:
      if (gpio_is_valid(audpwron))
            gpio_free(audpwron);
gpio1_err:
      kfree(codec->reg_cache);
cache_err:
      kfree(priv);
      return ret;
}

static int __devexit twl6040_codec_remove(struct platform_device *pdev)
{
      struct twl6040_data *priv = twl6040_codec->private_data;
      int audpwron = priv->audpwron;
      int naudint = priv->naudint;

      if (gpio_is_valid(audpwron))
            gpio_free(audpwron);

      if (naudint)
            free_irq(naudint, twl6040_codec);

      snd_soc_unregister_dai(&twl6040_dai);
      snd_soc_unregister_codec(twl6040_codec);

      kfree(twl6040_codec);
      twl6040_codec = NULL;

      return 0;
}

static struct platform_driver twl6040_codec_driver = {
      .driver = {
            .name = "twl6040_codec",
            .owner = THIS_MODULE,
      },
      .probe = twl6040_codec_probe,
      .remove = __devexit_p(twl6040_codec_remove),
};

static int __init twl6040_codec_init(void)
{
      return platform_driver_register(&twl6040_codec_driver);
}
module_init(twl6040_codec_init);

static void __exit twl6040_codec_exit(void)
{
      platform_driver_unregister(&twl6040_codec_driver);
}
module_exit(twl6040_codec_exit);

MODULE_DESCRIPTION("ASoC TWL6040 codec driver");
MODULE_AUTHOR("Misael Lopez Cruz");
MODULE_LICENSE("GPL");

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