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cq93vc.c

/*
 * ALSA SoC CQ0093 Voice Codec Driver for DaVinci platforms
 *
 * Copyright (C) 2010 Texas Instruments, Inc
 *
 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/mfd/davinci_voicecodec.h>
#include <linux/spi/spi.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>

#include <mach/dm365.h>

static inline unsigned int cq93vc_read(struct snd_soc_codec *codec,
                                    unsigned int reg)
{
      struct davinci_vc *davinci_vc = codec->control_data;

      return readl(davinci_vc->base + reg);
}

static inline int cq93vc_write(struct snd_soc_codec *codec, unsigned int reg,
                   unsigned int value)
{
      struct davinci_vc *davinci_vc = codec->control_data;

      writel(value, davinci_vc->base + reg);

      return 0;
}

static const struct snd_kcontrol_new cq93vc_snd_controls[] = {
      SOC_SINGLE("PGA Capture Volume", DAVINCI_VC_REG05, 0, 0x03, 0),
      SOC_SINGLE("Mono DAC Playback Volume", DAVINCI_VC_REG09, 0, 0x3f, 0),
};

static int cq93vc_mute(struct snd_soc_dai *dai, int mute)
{
      struct snd_soc_codec *codec = dai->codec;
      u8 reg = cq93vc_read(codec, DAVINCI_VC_REG09) & ~DAVINCI_VC_REG09_MUTE;

      if (mute)
            cq93vc_write(codec, DAVINCI_VC_REG09,
                       reg | DAVINCI_VC_REG09_MUTE);
      else
            cq93vc_write(codec, DAVINCI_VC_REG09, reg);

      return 0;
}

static int cq93vc_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 davinci_vc *davinci_vc = codec->control_data;

      switch (freq) {
      case 22579200:
      case 27000000:
      case 33868800:
            davinci_vc->cq93vc.sysclk = freq;
            return 0;
      }

      return -EINVAL;
}

static int cq93vc_set_bias_level(struct snd_soc_codec *codec,
                        enum snd_soc_bias_level level)
{
      switch (level) {
      case SND_SOC_BIAS_ON:
            cq93vc_write(codec, DAVINCI_VC_REG12,
                       DAVINCI_VC_REG12_POWER_ALL_ON);
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            cq93vc_write(codec, DAVINCI_VC_REG12,
                       DAVINCI_VC_REG12_POWER_ALL_OFF);
            break;
      case SND_SOC_BIAS_OFF:
            /* force all power off */
            cq93vc_write(codec, DAVINCI_VC_REG12,
                       DAVINCI_VC_REG12_POWER_ALL_OFF);
            break;
      }
      codec->dapm.bias_level = level;

      return 0;
}

#define CQ93VC_RATES    (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000)
#define CQ93VC_FORMATS  (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)

static struct snd_soc_dai_ops cq93vc_dai_ops = {
      .digital_mute     = cq93vc_mute,
      .set_sysclk = cq93vc_set_dai_sysclk,
};

static struct snd_soc_dai_driver cq93vc_dai = {
      .name = "cq93vc-hifi",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 1,
            .channels_max = 2,
            .rates = CQ93VC_RATES,
            .formats = CQ93VC_FORMATS,},
      .capture = {
            .stream_name = "Capture",
            .channels_min = 1,
            .channels_max = 2,
            .rates = CQ93VC_RATES,
            .formats = CQ93VC_FORMATS,},
      .ops = &cq93vc_dai_ops,
};

static int cq93vc_resume(struct snd_soc_codec *codec)
{
      cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      return 0;
}

static int cq93vc_probe(struct snd_soc_codec *codec)
{
      struct davinci_vc *davinci_vc = codec->dev->platform_data;

      davinci_vc->cq93vc.codec = codec;
      codec->control_data = davinci_vc;

      /* Set controls */
      snd_soc_add_controls(codec, cq93vc_snd_controls,
                       ARRAY_SIZE(cq93vc_snd_controls));

      /* Off, with power on */
      cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      return 0;
}

static int cq93vc_remove(struct snd_soc_codec *codec)
{
      cq93vc_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_cq93vc = {
      .read = cq93vc_read,
      .write = cq93vc_write,
      .set_bias_level = cq93vc_set_bias_level,
      .probe = cq93vc_probe,
      .remove = cq93vc_remove,
      .resume = cq93vc_resume,
};

static int cq93vc_platform_probe(struct platform_device *pdev)
{
      return snd_soc_register_codec(&pdev->dev,
                  &soc_codec_dev_cq93vc, &cq93vc_dai, 1);
}

static int cq93vc_platform_remove(struct platform_device *pdev)
{
      snd_soc_unregister_codec(&pdev->dev);
      return 0;
}

static struct platform_driver cq93vc_codec_driver = {
      .driver = {
                  .name = "cq93vc-codec",
                  .owner = THIS_MODULE,
      },

      .probe = cq93vc_platform_probe,
      .remove = __devexit_p(cq93vc_platform_remove),
};

static int __init cq93vc_init(void)
{
      return platform_driver_register(&cq93vc_codec_driver);
}
module_init(cq93vc_init);

static void __exit cq93vc_exit(void)
{
      platform_driver_unregister(&cq93vc_codec_driver);
}
module_exit(cq93vc_exit);

MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC CQ0093 Voice Codec Driver");
MODULE_AUTHOR("Miguel Aguilar");
MODULE_LICENSE("GPL");

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