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jz4740.c

/*
 * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
 *
 * 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.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <linux/delay.h>

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

#define JZ4740_REG_CODEC_1 0x0
#define JZ4740_REG_CODEC_2 0x1

#define JZ4740_CODEC_1_LINE_ENABLE BIT(29)
#define JZ4740_CODEC_1_MIC_ENABLE BIT(28)
#define JZ4740_CODEC_1_SW1_ENABLE BIT(27)
#define JZ4740_CODEC_1_ADC_ENABLE BIT(26)
#define JZ4740_CODEC_1_SW2_ENABLE BIT(25)
#define JZ4740_CODEC_1_DAC_ENABLE BIT(24)
#define JZ4740_CODEC_1_VREF_DISABLE BIT(20)
#define JZ4740_CODEC_1_VREF_AMP_DISABLE BIT(19)
#define JZ4740_CODEC_1_VREF_PULLDOWN BIT(18)
#define JZ4740_CODEC_1_VREF_LOW_CURRENT BIT(17)
#define JZ4740_CODEC_1_VREF_HIGH_CURRENT BIT(16)
#define JZ4740_CODEC_1_HEADPHONE_DISABLE BIT(14)
#define JZ4740_CODEC_1_HEADPHONE_AMP_CHANGE_ANY BIT(13)
#define JZ4740_CODEC_1_HEADPHONE_CHARGE BIT(12)
#define JZ4740_CODEC_1_HEADPHONE_PULLDOWN (BIT(11) | BIT(10))
#define JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M BIT(9)
#define JZ4740_CODEC_1_HEADPHONE_POWERDOWN BIT(8)
#define JZ4740_CODEC_1_SUSPEND BIT(1)
#define JZ4740_CODEC_1_RESET BIT(0)

#define JZ4740_CODEC_1_LINE_ENABLE_OFFSET 29
#define JZ4740_CODEC_1_MIC_ENABLE_OFFSET 28
#define JZ4740_CODEC_1_SW1_ENABLE_OFFSET 27
#define JZ4740_CODEC_1_ADC_ENABLE_OFFSET 26
#define JZ4740_CODEC_1_SW2_ENABLE_OFFSET 25
#define JZ4740_CODEC_1_DAC_ENABLE_OFFSET 24
#define JZ4740_CODEC_1_HEADPHONE_DISABLE_OFFSET 14
#define JZ4740_CODEC_1_HEADPHONE_POWERDOWN_OFFSET 8

#define JZ4740_CODEC_2_INPUT_VOLUME_MASK        0x1f0000
#define JZ4740_CODEC_2_SAMPLE_RATE_MASK               0x000f00
#define JZ4740_CODEC_2_MIC_BOOST_GAIN_MASK            0x000030
#define JZ4740_CODEC_2_HEADPHONE_VOLUME_MASK    0x000003

#define JZ4740_CODEC_2_INPUT_VOLUME_OFFSET            16
#define JZ4740_CODEC_2_SAMPLE_RATE_OFFSET        8
#define JZ4740_CODEC_2_MIC_BOOST_GAIN_OFFSET     4
#define JZ4740_CODEC_2_HEADPHONE_VOLUME_OFFSET   0

static const uint32_t jz4740_codec_regs[] = {
      0x021b2302, 0x00170803,
};

00073 struct jz4740_codec {
      void __iomem *base;
      struct resource *mem;
};

static unsigned int jz4740_codec_read(struct snd_soc_codec *codec,
      unsigned int reg)
{
      struct jz4740_codec *jz4740_codec = snd_soc_codec_get_drvdata(codec);
      return readl(jz4740_codec->base + (reg << 2));
}

static int jz4740_codec_write(struct snd_soc_codec *codec, unsigned int reg,
      unsigned int val)
{
      struct jz4740_codec *jz4740_codec = snd_soc_codec_get_drvdata(codec);
      u32 *cache = codec->reg_cache;

      cache[reg] = val;
      writel(val, jz4740_codec->base + (reg << 2));

      return 0;
}

static const struct snd_kcontrol_new jz4740_codec_controls[] = {
      SOC_SINGLE("Master Playback Volume", JZ4740_REG_CODEC_2,
                  JZ4740_CODEC_2_HEADPHONE_VOLUME_OFFSET, 3, 0),
      SOC_SINGLE("Master Capture Volume", JZ4740_REG_CODEC_2,
                  JZ4740_CODEC_2_INPUT_VOLUME_OFFSET, 31, 0),
      SOC_SINGLE("Master Playback Switch", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_HEADPHONE_DISABLE_OFFSET, 1, 1),
      SOC_SINGLE("Mic Capture Volume", JZ4740_REG_CODEC_2,
                  JZ4740_CODEC_2_MIC_BOOST_GAIN_OFFSET, 3, 0),
};

static const struct snd_kcontrol_new jz4740_codec_output_controls[] = {
      SOC_DAPM_SINGLE("Bypass Switch", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_SW1_ENABLE_OFFSET, 1, 0),
      SOC_DAPM_SINGLE("DAC Switch", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_SW2_ENABLE_OFFSET, 1, 0),
};

static const struct snd_kcontrol_new jz4740_codec_input_controls[] = {
      SOC_DAPM_SINGLE("Line Capture Switch", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_LINE_ENABLE_OFFSET, 1, 0),
      SOC_DAPM_SINGLE("Mic Capture Switch", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_MIC_ENABLE_OFFSET, 1, 0),
};

static const struct snd_soc_dapm_widget jz4740_codec_dapm_widgets[] = {
      SND_SOC_DAPM_ADC("ADC", "Capture", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_ADC_ENABLE_OFFSET, 0),
      SND_SOC_DAPM_DAC("DAC", "Playback", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_DAC_ENABLE_OFFSET, 0),

      SND_SOC_DAPM_MIXER("Output Mixer", JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_HEADPHONE_POWERDOWN_OFFSET, 1,
                  jz4740_codec_output_controls,
                  ARRAY_SIZE(jz4740_codec_output_controls)),

      SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
                  jz4740_codec_input_controls,
                  ARRAY_SIZE(jz4740_codec_input_controls)),
      SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),

      SND_SOC_DAPM_OUTPUT("LOUT"),
      SND_SOC_DAPM_OUTPUT("ROUT"),

      SND_SOC_DAPM_INPUT("MIC"),
      SND_SOC_DAPM_INPUT("LIN"),
      SND_SOC_DAPM_INPUT("RIN"),
};

static const struct snd_soc_dapm_route jz4740_codec_dapm_routes[] = {
      {"Line Input", NULL, "LIN"},
      {"Line Input", NULL, "RIN"},

      {"Input Mixer", "Line Capture Switch", "Line Input"},
      {"Input Mixer", "Mic Capture Switch", "MIC"},

      {"ADC", NULL, "Input Mixer"},

      {"Output Mixer", "Bypass Switch", "Input Mixer"},
      {"Output Mixer", "DAC Switch", "DAC"},

      {"LOUT", NULL, "Output Mixer"},
      {"ROUT", NULL, "Output Mixer"},
};

static int jz4740_codec_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
      uint32_t val;
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_codec *codec =rtd->codec;

      switch (params_rate(params)) {
      case 8000:
            val = 0;
            break;
      case 11025:
            val = 1;
            break;
      case 12000:
            val = 2;
            break;
      case 16000:
            val = 3;
            break;
      case 22050:
            val = 4;
            break;
      case 24000:
            val = 5;
            break;
      case 32000:
            val = 6;
            break;
      case 44100:
            val = 7;
            break;
      case 48000:
            val = 8;
            break;
      default:
            return -EINVAL;
      }

      val <<= JZ4740_CODEC_2_SAMPLE_RATE_OFFSET;

      snd_soc_update_bits(codec, JZ4740_REG_CODEC_2,
                        JZ4740_CODEC_2_SAMPLE_RATE_MASK, val);

      return 0;
}

static struct snd_soc_dai_ops jz4740_codec_dai_ops = {
      .hw_params = jz4740_codec_hw_params,
};

static struct snd_soc_dai_driver jz4740_codec_dai = {
      .name = "jz4740-hifi",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_48000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
      },
      .capture = {
            .stream_name = "Capture",
            .channels_min = 2,
            .channels_max = 2,
            .rates = SNDRV_PCM_RATE_8000_48000,
            .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
      },
      .ops = &jz4740_codec_dai_ops,
      .symmetric_rates = 1,
};

static void jz4740_codec_wakeup(struct snd_soc_codec *codec)
{
      int i;
      uint32_t *cache = codec->reg_cache;

      snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
            JZ4740_CODEC_1_RESET, JZ4740_CODEC_1_RESET);
      udelay(2);

      snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
            JZ4740_CODEC_1_SUSPEND | JZ4740_CODEC_1_RESET, 0);

      for (i = 0; i < ARRAY_SIZE(jz4740_codec_regs); ++i)
            jz4740_codec_write(codec, i, cache[i]);
}

static int jz4740_codec_set_bias_level(struct snd_soc_codec *codec,
      enum snd_soc_bias_level level)
{
      unsigned int mask;
      unsigned int value;

      switch (level) {
      case SND_SOC_BIAS_ON:
            break;
      case SND_SOC_BIAS_PREPARE:
            mask = JZ4740_CODEC_1_VREF_DISABLE |
                        JZ4740_CODEC_1_VREF_AMP_DISABLE |
                        JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
            value = 0;

            snd_soc_update_bits(codec, JZ4740_REG_CODEC_1, mask, value);
            break;
      case SND_SOC_BIAS_STANDBY:
            /* The only way to clear the suspend flag is to reset the codec */
            if (codec->dapm.bias_level == SND_SOC_BIAS_OFF)
                  jz4740_codec_wakeup(codec);

            mask = JZ4740_CODEC_1_VREF_DISABLE |
                  JZ4740_CODEC_1_VREF_AMP_DISABLE |
                  JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
            value = JZ4740_CODEC_1_VREF_DISABLE |
                  JZ4740_CODEC_1_VREF_AMP_DISABLE |
                  JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;

            snd_soc_update_bits(codec, JZ4740_REG_CODEC_1, mask, value);
            break;
      case SND_SOC_BIAS_OFF:
            mask = JZ4740_CODEC_1_SUSPEND;
            value = JZ4740_CODEC_1_SUSPEND;

            snd_soc_update_bits(codec, JZ4740_REG_CODEC_1, mask, value);
            break;
      default:
            break;
      }

      codec->dapm.bias_level = level;

      return 0;
}

static int jz4740_codec_dev_probe(struct snd_soc_codec *codec)
{
      struct snd_soc_dapm_context *dapm = &codec->dapm;

      snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
                  JZ4740_CODEC_1_SW2_ENABLE, JZ4740_CODEC_1_SW2_ENABLE);

      snd_soc_add_controls(codec, jz4740_codec_controls,
            ARRAY_SIZE(jz4740_codec_controls));

      snd_soc_dapm_new_controls(dapm, jz4740_codec_dapm_widgets,
            ARRAY_SIZE(jz4740_codec_dapm_widgets));

      snd_soc_dapm_add_routes(dapm, jz4740_codec_dapm_routes,
            ARRAY_SIZE(jz4740_codec_dapm_routes));

      snd_soc_dapm_new_widgets(codec);

      jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      return 0;
}

static int jz4740_codec_dev_remove(struct snd_soc_codec *codec)
{
      jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

#ifdef CONFIG_PM_SLEEP

static int jz4740_codec_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
      return jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_OFF);
}

static int jz4740_codec_resume(struct snd_soc_codec *codec)
{
      return jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
}

#else
#define jz4740_codec_suspend NULL
#define jz4740_codec_resume NULL
#endif

static struct snd_soc_codec_driver soc_codec_dev_jz4740_codec = {
      .probe = jz4740_codec_dev_probe,
      .remove = jz4740_codec_dev_remove,
      .suspend = jz4740_codec_suspend,
      .resume = jz4740_codec_resume,
      .read = jz4740_codec_read,
      .write = jz4740_codec_write,
      .set_bias_level = jz4740_codec_set_bias_level,
      .reg_cache_default      = jz4740_codec_regs,
      .reg_word_size = sizeof(u32),
      .reg_cache_size   = 2,
};

static int __devinit jz4740_codec_probe(struct platform_device *pdev)
{
      int ret;
      struct jz4740_codec *jz4740_codec;
      struct resource *mem;

      jz4740_codec = kzalloc(sizeof(*jz4740_codec), GFP_KERNEL);
      if (!jz4740_codec)
            return -ENOMEM;

      mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      if (!mem) {
            dev_err(&pdev->dev, "Failed to get mmio memory resource\n");
            ret = -ENOENT;
            goto err_free_codec;
      }

      mem = request_mem_region(mem->start, resource_size(mem), pdev->name);
      if (!mem) {
            dev_err(&pdev->dev, "Failed to request mmio memory region\n");
            ret = -EBUSY;
            goto err_free_codec;
      }

      jz4740_codec->base = ioremap(mem->start, resource_size(mem));
      if (!jz4740_codec->base) {
            dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
            ret = -EBUSY;
            goto err_release_mem_region;
      }
      jz4740_codec->mem = mem;

      platform_set_drvdata(pdev, jz4740_codec);

      ret = snd_soc_register_codec(&pdev->dev,
                  &soc_codec_dev_jz4740_codec, &jz4740_codec_dai, 1);
      if (ret) {
            dev_err(&pdev->dev, "Failed to register codec\n");
            goto err_iounmap;
      }

      return 0;

err_iounmap:
      iounmap(jz4740_codec->base);
err_release_mem_region:
      release_mem_region(mem->start, resource_size(mem));
err_free_codec:
      kfree(jz4740_codec);

      return ret;
}

static int __devexit jz4740_codec_remove(struct platform_device *pdev)
{
      struct jz4740_codec *jz4740_codec = platform_get_drvdata(pdev);
      struct resource *mem = jz4740_codec->mem;

      snd_soc_unregister_codec(&pdev->dev);

      iounmap(jz4740_codec->base);
      release_mem_region(mem->start, resource_size(mem));

      platform_set_drvdata(pdev, NULL);
      kfree(jz4740_codec);

      return 0;
}

static struct platform_driver jz4740_codec_driver = {
      .probe = jz4740_codec_probe,
      .remove = __devexit_p(jz4740_codec_remove),
      .driver = {
            .name = "jz4740-codec",
            .owner = THIS_MODULE,
      },
};

static int __init jz4740_codec_init(void)
{
      return platform_driver_register(&jz4740_codec_driver);
}
module_init(jz4740_codec_init);

static void __exit jz4740_codec_exit(void)
{
      platform_driver_unregister(&jz4740_codec_driver);
}
module_exit(jz4740_codec_exit);

MODULE_DESCRIPTION("JZ4740 SoC internal codec driver");
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:jz4740-codec");

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