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sn95031.c

/*
 *  sn95031.c -  TI sn95031 Codec driver
 *
 *  Copyright (C) 2010 Intel Corp
 *  Author: Vinod Koul <vinod.koul@intel.com>
 *  Author: Harsha Priya <priya.harsha@intel.com>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  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.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/platform_device.h>
#include <linux/slab.h>
#include <asm/intel_scu_ipc.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include "sn95031.h"

#define SN95031_RATES (SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_44100)
#define SN95031_FORMATS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)

/*
 * todo:
 * capture paths
 * jack detection
 * PM functions
 */

static inline unsigned int sn95031_read(struct snd_soc_codec *codec,
                  unsigned int reg)
{
      u8 value = 0;
      int ret;

      ret = intel_scu_ipc_ioread8(reg, &value);
      if (ret)
            pr_err("read of %x failed, err %d\n", reg, ret);
      return value;

}

static inline int sn95031_write(struct snd_soc_codec *codec,
                  unsigned int reg, unsigned int value)
{
      int ret;

      ret = intel_scu_ipc_iowrite8(reg, value);
      if (ret)
            pr_err("write of %x failed, err %d\n", reg, ret);
      return ret;
}

static int sn95031_set_vaud_bias(struct snd_soc_codec *codec,
            enum snd_soc_bias_level level)
{
      switch (level) {
      case SND_SOC_BIAS_ON:
            break;

      case SND_SOC_BIAS_PREPARE:
            if (codec->dapm.bias_level == SND_SOC_BIAS_STANDBY) {
                  pr_debug("vaud_bias powering up pll\n");
                  /* power up the pll */
                  snd_soc_write(codec, SN95031_AUDPLLCTRL, BIT(5));
                  /* enable pcm 2 */
                  snd_soc_update_bits(codec, SN95031_PCM2C2,
                              BIT(0), BIT(0));
            }
            break;

      case SND_SOC_BIAS_STANDBY:
            if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
                  pr_debug("vaud_bias power up rail\n");
                  /* power up the rail */
                  snd_soc_write(codec, SN95031_VAUD,
                              BIT(2)|BIT(1)|BIT(0));
                  msleep(1);
            } else if (codec->dapm.bias_level == SND_SOC_BIAS_PREPARE) {
                  /* turn off pcm */
                  pr_debug("vaud_bias power dn pcm\n");
                  snd_soc_update_bits(codec, SN95031_PCM2C2, BIT(0), 0);
                  snd_soc_write(codec, SN95031_AUDPLLCTRL, 0);
            }
            break;


      case SND_SOC_BIAS_OFF:
            pr_debug("vaud_bias _OFF doing rail shutdown\n");
            snd_soc_write(codec, SN95031_VAUD, BIT(3));
            break;
      }

      codec->dapm.bias_level = level;
      return 0;
}

static int sn95031_vhs_event(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *kcontrol, int event)
{
      if (SND_SOC_DAPM_EVENT_ON(event)) {
            pr_debug("VHS SND_SOC_DAPM_EVENT_ON doing rail startup now\n");
            /* power up the rail */
            snd_soc_write(w->codec, SN95031_VHSP, 0x3D);
            snd_soc_write(w->codec, SN95031_VHSN, 0x3F);
            msleep(1);
      } else if (SND_SOC_DAPM_EVENT_OFF(event)) {
            pr_debug("VHS SND_SOC_DAPM_EVENT_OFF doing rail shutdown\n");
            snd_soc_write(w->codec, SN95031_VHSP, 0xC4);
            snd_soc_write(w->codec, SN95031_VHSN, 0x04);
      }
      return 0;
}

static int sn95031_vihf_event(struct snd_soc_dapm_widget *w,
                struct snd_kcontrol *kcontrol, int event)
{
      if (SND_SOC_DAPM_EVENT_ON(event)) {
            pr_debug("VIHF SND_SOC_DAPM_EVENT_ON doing rail startup now\n");
            /* power up the rail */
            snd_soc_write(w->codec, SN95031_VIHF, 0x27);
            msleep(1);
      } else if (SND_SOC_DAPM_EVENT_OFF(event)) {
            pr_debug("VIHF SND_SOC_DAPM_EVENT_OFF doing rail shutdown\n");
            snd_soc_write(w->codec, SN95031_VIHF, 0x24);
      }
      return 0;
}

/* DAPM widgets */
static const struct snd_soc_dapm_widget sn95031_dapm_widgets[] = {

      /* all end points mic, hs etc */
      SND_SOC_DAPM_OUTPUT("HPOUTL"),
      SND_SOC_DAPM_OUTPUT("HPOUTR"),
      SND_SOC_DAPM_OUTPUT("EPOUT"),
      SND_SOC_DAPM_OUTPUT("IHFOUTL"),
      SND_SOC_DAPM_OUTPUT("IHFOUTR"),
      SND_SOC_DAPM_OUTPUT("LINEOUTL"),
      SND_SOC_DAPM_OUTPUT("LINEOUTR"),
      SND_SOC_DAPM_OUTPUT("VIB1OUT"),
      SND_SOC_DAPM_OUTPUT("VIB2OUT"),

      SND_SOC_DAPM_SUPPLY("Headset Rail", SND_SOC_NOPM, 0, 0,
                  sn95031_vhs_event,
                  SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
      SND_SOC_DAPM_SUPPLY("Speaker Rail", SND_SOC_NOPM, 0, 0,
                  sn95031_vihf_event,
                  SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

      /* playback path driver enables */
      SND_SOC_DAPM_PGA("Headset Left Playback",
                  SN95031_DRIVEREN, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Headset Right Playback",
                  SN95031_DRIVEREN, 1, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Speaker Left Playback",
                  SN95031_DRIVEREN, 2, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Speaker Right Playback",
                  SN95031_DRIVEREN, 3, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Vibra1 Playback",
                  SN95031_DRIVEREN, 4, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Vibra2 Playback",
                  SN95031_DRIVEREN, 5, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Earpiece Playback",
                  SN95031_DRIVEREN, 6, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Lineout Left Playback",
                  SN95031_LOCTL, 0, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Lineout Right Playback",
                  SN95031_LOCTL, 4, 0, NULL, 0),

      /* playback path filter enable */
      SND_SOC_DAPM_PGA("Headset Left Filter",
                  SN95031_HSEPRXCTRL, 4, 0, NULL, 0),
      SND_SOC_DAPM_PGA("Headset Right Filter",
                  SN95031_HSEPRXCTRL, 5, 0,  NULL, 0),
      SND_SOC_DAPM_PGA("Speaker Left Filter",
                  SN95031_IHFRXCTRL, 0, 0,  NULL, 0),
      SND_SOC_DAPM_PGA("Speaker Right Filter",
                  SN95031_IHFRXCTRL, 1, 0,  NULL, 0),

      /* DACs */
      SND_SOC_DAPM_DAC("HSDAC Left", "Headset",
                  SN95031_DACCONFIG, 0, 0),
      SND_SOC_DAPM_DAC("HSDAC Right", "Headset",
                  SN95031_DACCONFIG, 1, 0),
      SND_SOC_DAPM_DAC("IHFDAC Left", "Speaker",
                  SN95031_DACCONFIG, 2, 0),
      SND_SOC_DAPM_DAC("IHFDAC Right", "Speaker",
                  SN95031_DACCONFIG, 3, 0),
      SND_SOC_DAPM_DAC("Vibra1 DAC", "Vibra1",
                  SN95031_VIB1C5, 1, 0),
      SND_SOC_DAPM_DAC("Vibra2 DAC", "Vibra2",
                  SN95031_VIB2C5, 1, 0),
};

static const struct snd_soc_dapm_route sn95031_audio_map[] = {
      /* headset and earpiece map */
      { "HPOUTL", NULL, "Headset Left Playback" },
      { "HPOUTR", NULL, "Headset Right Playback" },
      { "EPOUT", NULL, "Earpiece Playback" },
      { "Headset Left Playback", NULL, "Headset Left Filter"},
      { "Headset Right Playback", NULL, "Headset Right Filter"},
      { "Earpiece Playback", NULL, "Headset Left Filter"},
      { "Headset Left Filter", NULL, "HSDAC Left"},
      { "Headset Right Filter", NULL, "HSDAC Right"},
      { "HSDAC Left", NULL, "Headset Rail"},
      { "HSDAC Right", NULL, "Headset Rail"},

      /* speaker map */
      { "IHFOUTL", "NULL", "Speaker Left Playback"},
      { "IHFOUTR", "NULL", "Speaker Right Playback"},
      { "Speaker Left Playback", NULL, "Speaker Left Filter"},
      { "Speaker Right Playback", NULL, "Speaker Right Filter"},
      { "Speaker Left Filter", NULL, "IHFDAC Left"},
      { "Speaker Right Filter", NULL, "IHFDAC Right"},
      { "IHFDAC Left", NULL, "Speaker Rail"},
      { "IHFDAC Right", NULL, "Speaker Rail"},

      /* vibra map */
      { "VIB1OUT", NULL, "Vibra1 Playback"},
      { "Vibra1 Playback", NULL, "Vibra1 DAC"},

      { "VIB2OUT", NULL, "Vibra2 Playback"},
      { "Vibra2 Playback", NULL, "Vibra2 DAC"},

      /* lineout */
      { "LINEOUTL", NULL, "Lineout Left Playback"},
      { "LINEOUTR", NULL, "Lineout Right Playback"},
      { "Lineout Left Playback", NULL, "Headset Left Filter"},
      { "Lineout Left Playback", NULL, "Speaker Left Filter"},
      { "Lineout Left Playback", NULL, "Vibra1 DAC"},
      { "Lineout Right Playback", NULL, "Headset Right Filter"},
      { "Lineout Right Playback", NULL, "Speaker Right Filter"},
      { "Lineout Right Playback", NULL, "Vibra2 DAC"},
};

/* speaker and headset mutes, for audio pops and clicks */
static int sn95031_pcm_hs_mute(struct snd_soc_dai *dai, int mute)
{
      snd_soc_update_bits(dai->codec,
                  SN95031_HSLVOLCTRL, BIT(7), (!mute << 7));
      snd_soc_update_bits(dai->codec,
                  SN95031_HSRVOLCTRL, BIT(7), (!mute << 7));
      return 0;
}

static int sn95031_pcm_spkr_mute(struct snd_soc_dai *dai, int mute)
{
      snd_soc_update_bits(dai->codec,
                  SN95031_IHFLVOLCTRL, BIT(7), (!mute << 7));
      snd_soc_update_bits(dai->codec,
                  SN95031_IHFRVOLCTRL, BIT(7), (!mute << 7));
      return 0;
}

int sn95031_pcm_hw_params(struct snd_pcm_substream *substream,
            struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
      unsigned int format, rate;

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            format = BIT(4)|BIT(5);
            break;

      case SNDRV_PCM_FORMAT_S24_LE:
            format = 0;
            break;
      default:
            return -EINVAL;
      }
      snd_soc_update_bits(dai->codec, SN95031_PCM2C2,
                  BIT(4)|BIT(5), format);

      switch (params_rate(params)) {
      case 48000:
            pr_debug("RATE_48000\n");
            rate = 0;
            break;

      case 44100:
            pr_debug("RATE_44100\n");
            rate = BIT(7);
            break;

      default:
            pr_err("ERR rate %d\n", params_rate(params));
            return -EINVAL;
      }
      snd_soc_update_bits(dai->codec, SN95031_PCM1C1, BIT(7), rate);

      return 0;
}

/* Codec DAI section */
static struct snd_soc_dai_ops sn95031_headset_dai_ops = {
      .digital_mute     = sn95031_pcm_hs_mute,
      .hw_params  = sn95031_pcm_hw_params,
};

static struct snd_soc_dai_ops sn95031_speaker_dai_ops = {
      .digital_mute     = sn95031_pcm_spkr_mute,
      .hw_params  = sn95031_pcm_hw_params,
};

static struct snd_soc_dai_ops sn95031_vib1_dai_ops = {
      .hw_params  = sn95031_pcm_hw_params,
};

static struct snd_soc_dai_ops sn95031_vib2_dai_ops = {
      .hw_params  = sn95031_pcm_hw_params,
};

struct snd_soc_dai_driver sn95031_dais[] = {
{
      .name = "SN95031 Headset",
      .playback = {
            .stream_name = "Headset",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SN95031_RATES,
            .formats = SN95031_FORMATS,
      },
      .ops = &sn95031_headset_dai_ops,
},
{     .name = "SN95031 Speaker",
      .playback = {
            .stream_name = "Speaker",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SN95031_RATES,
            .formats = SN95031_FORMATS,
      },
      .ops = &sn95031_speaker_dai_ops,
},
{     .name = "SN95031 Vibra1",
      .playback = {
            .stream_name = "Vibra1",
            .channels_min = 1,
            .channels_max = 1,
            .rates = SN95031_RATES,
            .formats = SN95031_FORMATS,
      },
      .ops = &sn95031_vib1_dai_ops,
},
{     .name = "SN95031 Vibra2",
      .playback = {
            .stream_name = "Vibra2",
            .channels_min = 1,
            .channels_max = 1,
            .rates = SN95031_RATES,
            .formats = SN95031_FORMATS,
      },
      .ops = &sn95031_vib2_dai_ops,
},
};

/* codec registration */
static int sn95031_codec_probe(struct snd_soc_codec *codec)
{
      int ret;

      pr_debug("codec_probe called\n");

      codec->dapm.bias_level = SND_SOC_BIAS_OFF;
      codec->dapm.idle_bias_off = 1;

      /* PCM interface config
       * This sets the pcm rx slot conguration to max 6 slots
       * for max 4 dais (2 stereo and 2 mono)
       */
      snd_soc_write(codec, SN95031_PCM2RXSLOT01, 0x10);
      snd_soc_write(codec, SN95031_PCM2RXSLOT23, 0x32);
      snd_soc_write(codec, SN95031_PCM2RXSLOT45, 0x54);
      /* pcm port setting
       * This sets the pcm port to slave and clock at 19.2Mhz which
       * can support 6slots, sampling rate set per stream in hw-params
       */
      snd_soc_write(codec, SN95031_PCM1C1, 0x00);
      snd_soc_write(codec, SN95031_PCM2C1, 0x01);
      snd_soc_write(codec, SN95031_PCM2C2, 0x0A);
      snd_soc_write(codec, SN95031_HSMIXER, BIT(0)|BIT(4));
      /* vendor vibra workround, the vibras are muted by
       * custom register so unmute them
       */
      snd_soc_write(codec, SN95031_SSR5, 0x80);
      snd_soc_write(codec, SN95031_SSR6, 0x80);
      snd_soc_write(codec, SN95031_VIB1C5, 0x00);
      snd_soc_write(codec, SN95031_VIB2C5, 0x00);
      /* configure vibras for pcm port */
      snd_soc_write(codec, SN95031_VIB1C3, 0x00);
      snd_soc_write(codec, SN95031_VIB2C3, 0x00);

      /* soft mute ramp time */
      snd_soc_write(codec, SN95031_SOFTMUTE, 0x3);
      /* fix the initial volume at 1dB,
       * default in +9dB,
       * 1dB give optimal swing on DAC, amps
       */
      snd_soc_write(codec, SN95031_HSLVOLCTRL, 0x08);
      snd_soc_write(codec, SN95031_HSRVOLCTRL, 0x08);
      snd_soc_write(codec, SN95031_IHFLVOLCTRL, 0x08);
      snd_soc_write(codec, SN95031_IHFRVOLCTRL, 0x08);
      /* dac mode and lineout workaround */
      snd_soc_write(codec, SN95031_SSR2, 0x10);
      snd_soc_write(codec, SN95031_SSR3, 0x40);

      ret = snd_soc_dapm_new_controls(&codec->dapm, sn95031_dapm_widgets,
                        ARRAY_SIZE(sn95031_dapm_widgets));
      if (ret)
            pr_err("soc_dapm_new_control failed %d", ret);
      ret = snd_soc_dapm_add_routes(&codec->dapm, sn95031_audio_map,
                        ARRAY_SIZE(sn95031_audio_map));
      if (ret)
            pr_err("soc_dapm_add_routes failed %d", ret);

      return ret;
}

static int sn95031_codec_remove(struct snd_soc_codec *codec)
{
      pr_debug("codec_remove called\n");
      sn95031_set_vaud_bias(codec, SND_SOC_BIAS_OFF);

      return 0;
}

struct snd_soc_codec_driver sn95031_codec = {
      .probe            = sn95031_codec_probe,
      .remove           = sn95031_codec_remove,
      .read       = sn95031_read,
      .write            = sn95031_write,
      .set_bias_level   = sn95031_set_vaud_bias,
};

static int __devinit sn95031_device_probe(struct platform_device *pdev)
{
      pr_debug("codec device probe called for %s\n", dev_name(&pdev->dev));
      return snd_soc_register_codec(&pdev->dev, &sn95031_codec,
                  sn95031_dais, ARRAY_SIZE(sn95031_dais));
}

static int __devexit sn95031_device_remove(struct platform_device *pdev)
{
      pr_debug("codec device remove called\n");
      snd_soc_unregister_codec(&pdev->dev);
      return 0;
}

static struct platform_driver sn95031_codec_driver = {
      .driver           = {
            .name       = "sn95031",
            .owner            = THIS_MODULE,
      },
      .probe            = sn95031_device_probe,
      .remove           = sn95031_device_remove,
};

static int __init sn95031_init(void)
{
      pr_debug("driver init called\n");
      return platform_driver_register(&sn95031_codec_driver);
}
module_init(sn95031_init);

static void __exit sn95031_exit(void)
{
      pr_debug("driver exit called\n");
      platform_driver_unregister(&sn95031_codec_driver);
}
module_exit(sn95031_exit);

MODULE_DESCRIPTION("ASoC TI SN95031 codec driver");
MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sn95031");

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