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zylonite.c

/*
 * zylonite.c  --  SoC audio for Zylonite
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.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.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include "../codecs/wm9713.h"
#include "pxa2xx-pcm.h"
#include "pxa2xx-ac97.h"
#include "pxa-ssp.h"

/*
 * There is a physical switch SW15 on the board which changes the MCLK
 * for the WM9713 between the standard AC97 master clock and the
 * output of the CLK_POUT signal from the PXA.
 */
static int clk_pout;
module_param(clk_pout, int, 0);
MODULE_PARM_DESC(clk_pout, "Use CLK_POUT as WM9713 MCLK (SW15 on board).");

static struct clk *pout;

static struct snd_soc_card zylonite;

static const struct snd_soc_dapm_widget zylonite_dapm_widgets[] = {
      SND_SOC_DAPM_HP("Headphone", NULL),
      SND_SOC_DAPM_MIC("Headset Microphone", NULL),
      SND_SOC_DAPM_MIC("Handset Microphone", NULL),
      SND_SOC_DAPM_SPK("Multiactor", NULL),
      SND_SOC_DAPM_SPK("Headset Earpiece", NULL),
};

/* Currently supported audio map */
static const struct snd_soc_dapm_route audio_map[] = {

      /* Headphone output connected to HPL/HPR */
      { "Headphone", NULL,  "HPL" },
      { "Headphone", NULL,  "HPR" },

      /* On-board earpiece */
      { "Headset Earpiece", NULL, "OUT3" },

      /* Headphone mic */
      { "MIC2A", NULL, "Mic Bias" },
      { "Mic Bias", NULL, "Headset Microphone" },

      /* On-board mic */
      { "MIC1", NULL, "Mic Bias" },
      { "Mic Bias", NULL, "Handset Microphone" },

      /* Multiactor differentially connected over SPKL/SPKR */
      { "Multiactor", NULL, "SPKL" },
      { "Multiactor", NULL, "SPKR" },
};

static int zylonite_wm9713_init(struct snd_soc_codec *codec)
{
      if (clk_pout)
            snd_soc_dai_set_pll(&codec->dai[0], 0, clk_get_rate(pout), 0);

      snd_soc_dapm_new_controls(codec, zylonite_dapm_widgets,
                          ARRAY_SIZE(zylonite_dapm_widgets));

      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

      /* Static setup for now */
      snd_soc_dapm_enable_pin(codec, "Headphone");
      snd_soc_dapm_enable_pin(codec, "Headset Earpiece");

      snd_soc_dapm_sync(codec);
      return 0;
}

static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
                            struct snd_pcm_hw_params *params)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      unsigned int pll_out = 0;
      unsigned int wm9713_div = 0;
      int ret = 0;
      int rate = params_rate(params);
      int width = snd_pcm_format_physical_width(params_format(params));

      /* Only support ratios that we can generate neatly from the AC97
       * based master clock - in particular, this excludes 44.1kHz.
       * In most applications the voice DAC will be used for telephony
       * data so multiples of 8kHz will be the common case.
       */
      switch (rate) {
      case 8000:
            wm9713_div = 12;
            break;
      case 16000:
            wm9713_div = 6;
            break;
      case 48000:
            wm9713_div = 2;
            break;
      default:
            /* Don't support OSS emulation */
            return -EINVAL;
      }

      /* Add 1 to the width for the leading clock cycle */
      pll_out = rate * (width + 1) * 8;

      ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_AUDIO, 0, 1);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, pll_out);
      if (ret < 0)
            return ret;

      if (clk_pout)
            ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
                                   WM9713_PCMDIV(wm9713_div));
      else
            ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
                                   WM9713_PCMDIV(wm9713_div));
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      return 0;
}

static struct snd_soc_ops zylonite_voice_ops = {
      .hw_params = zylonite_voice_hw_params,
};

static struct snd_soc_dai_link zylonite_dai[] = {
{
      .name = "AC97",
      .stream_name = "AC97 HiFi",
      .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_HIFI],
      .codec_dai = &wm9713_dai[WM9713_DAI_AC97_HIFI],
      .init = zylonite_wm9713_init,
},
{
      .name = "AC97 Aux",
      .stream_name = "AC97 Aux",
      .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_AUX],
      .codec_dai = &wm9713_dai[WM9713_DAI_AC97_AUX],
},
{
      .name = "WM9713 Voice",
      .stream_name = "WM9713 Voice",
      .cpu_dai = &pxa_ssp_dai[PXA_DAI_SSP3],
      .codec_dai = &wm9713_dai[WM9713_DAI_PCM_VOICE],
      .ops = &zylonite_voice_ops,
},
};

static int zylonite_probe(struct platform_device *pdev)
{
      int ret;

      if (clk_pout) {
            pout = clk_get(NULL, "CLK_POUT");
            if (IS_ERR(pout)) {
                  dev_err(&pdev->dev, "Unable to obtain CLK_POUT: %ld\n",
                        PTR_ERR(pout));
                  return PTR_ERR(pout);
            }

            ret = clk_enable(pout);
            if (ret != 0) {
                  dev_err(&pdev->dev, "Unable to enable CLK_POUT: %d\n",
                        ret);
                  clk_put(pout);
                  return ret;
            }

            dev_dbg(&pdev->dev, "MCLK enabled at %luHz\n",
                  clk_get_rate(pout));
      }

      return 0;
}

static int zylonite_remove(struct platform_device *pdev)
{
      if (clk_pout) {
            clk_disable(pout);
            clk_put(pout);
      }

      return 0;
}

static int zylonite_suspend_post(struct platform_device *pdev,
                         pm_message_t state)
{
      if (clk_pout)
            clk_disable(pout);

      return 0;
}

static int zylonite_resume_pre(struct platform_device *pdev)
{
      int ret = 0;

      if (clk_pout) {
            ret = clk_enable(pout);
            if (ret != 0)
                  dev_err(&pdev->dev, "Unable to enable CLK_POUT: %d\n",
                        ret);
      }

      return ret;
}

static struct snd_soc_card zylonite = {
      .name = "Zylonite",
      .probe = &zylonite_probe,
      .remove = &zylonite_remove,
      .suspend_post = &zylonite_suspend_post,
      .resume_pre = &zylonite_resume_pre,
      .platform = &pxa2xx_soc_platform,
      .dai_link = zylonite_dai,
      .num_links = ARRAY_SIZE(zylonite_dai),
};

static struct snd_soc_device zylonite_snd_ac97_devdata = {
      .card = &zylonite,
      .codec_dev = &soc_codec_dev_wm9713,
};

static struct platform_device *zylonite_snd_ac97_device;

static int __init zylonite_init(void)
{
      int ret;

      zylonite_snd_ac97_device = platform_device_alloc("soc-audio", -1);
      if (!zylonite_snd_ac97_device)
            return -ENOMEM;

      platform_set_drvdata(zylonite_snd_ac97_device,
                       &zylonite_snd_ac97_devdata);
      zylonite_snd_ac97_devdata.dev = &zylonite_snd_ac97_device->dev;

      ret = platform_device_add(zylonite_snd_ac97_device);
      if (ret != 0)
            platform_device_put(zylonite_snd_ac97_device);

      return ret;
}

static void __exit zylonite_exit(void)
{
      platform_device_unregister(zylonite_snd_ac97_device);
}

module_init(zylonite_init);
module_exit(zylonite_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("ALSA SoC WM9713 Zylonite");
MODULE_LICENSE("GPL");

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