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pxa2xx-ac97.c

/*
 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
 *
 * Author:  Nicolas Pitre
 * Created: Dec 02, 2004
 * Copyright:     MontaVista Software Inc.
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/pxa2xx-lib.h>

#include <mach/regs-ac97.h>
#include <mach/audio.h>

#include "pxa2xx-pcm.h"

static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
{
      if (!pxa2xx_ac97_try_cold_reset(ac97)) {
            pxa2xx_ac97_try_warm_reset(ac97);
      }

      pxa2xx_ac97_finish_reset(ac97);
}

static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
      .read = pxa2xx_ac97_read,
      .write      = pxa2xx_ac97_write,
      .reset      = pxa2xx_ac97_reset,
};

static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
      .name             = "AC97 PCM out",
      .dev_addr         = __PREG(PCDR),
      .drcmr                  = &DRCMR(12),
      .dcmd             = DCMD_INCSRCADDR | DCMD_FLOWTRG |
                          DCMD_BURST32 | DCMD_WIDTH4,
};

static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
      .name             = "AC97 PCM in",
      .dev_addr         = __PREG(PCDR),
      .drcmr                  = &DRCMR(11),
      .dcmd             = DCMD_INCTRGADDR | DCMD_FLOWSRC |
                          DCMD_BURST32 | DCMD_WIDTH4,
};

static struct snd_pcm *pxa2xx_ac97_pcm;
static struct snd_ac97 *pxa2xx_ac97_ac97;

static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      pxa2xx_audio_ops_t *platform_ops;
      int r;

      runtime->hw.channels_min = 2;
      runtime->hw.channels_max = 2;

      r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
          AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
      runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
      snd_pcm_limit_hw_rates(runtime);

            platform_ops = substream->pcm->card->dev->platform_data;
      if (platform_ops && platform_ops->startup)
            return platform_ops->startup(substream, platform_ops->priv);
      else
            return 0;
}

static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
{
      pxa2xx_audio_ops_t *platform_ops;

            platform_ops = substream->pcm->card->dev->platform_data;
      if (platform_ops && platform_ops->shutdown)
            platform_ops->shutdown(substream, platform_ops->priv);
}

static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
              AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
      return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
}

static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
      .playback_params  = &pxa2xx_ac97_pcm_out,
      .capture_params         = &pxa2xx_ac97_pcm_in,
      .startup          = pxa2xx_ac97_pcm_startup,
      .shutdown         = pxa2xx_ac97_pcm_shutdown,
      .prepare          = pxa2xx_ac97_pcm_prepare,
};

#ifdef CONFIG_PM

static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
{
      pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
      snd_pcm_suspend_all(pxa2xx_ac97_pcm);
      snd_ac97_suspend(pxa2xx_ac97_ac97);
      if (platform_ops && platform_ops->suspend)
            platform_ops->suspend(platform_ops->priv);

      return pxa2xx_ac97_hw_suspend();
}

static int pxa2xx_ac97_do_resume(struct snd_card *card)
{
      pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
      int rc;

      rc = pxa2xx_ac97_hw_resume();
      if (rc)
            return rc;

      if (platform_ops && platform_ops->resume)
            platform_ops->resume(platform_ops->priv);
      snd_ac97_resume(pxa2xx_ac97_ac97);
      snd_power_change_state(card, SNDRV_CTL_POWER_D0);

      return 0;
}

static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
{
      struct snd_card *card = platform_get_drvdata(dev);
      int ret = 0;

      if (card)
            ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);

      return ret;
}

static int pxa2xx_ac97_resume(struct platform_device *dev)
{
      struct snd_card *card = platform_get_drvdata(dev);
      int ret = 0;

      if (card)
            ret = pxa2xx_ac97_do_resume(card);

      return ret;
}

#else
#define pxa2xx_ac97_suspend   NULL
#define pxa2xx_ac97_resume    NULL
#endif

static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
{
      struct snd_card *card;
      struct snd_ac97_bus *ac97_bus;
      struct snd_ac97_template ac97_template;
      int ret;
      pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;

      if (dev->id >= 0) {
            dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
            ret = -ENXIO;
            goto err_dev;
      }

      ret = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
                        THIS_MODULE, 0, &card);
      if (ret < 0)
            goto err;

      card->dev = &dev->dev;
      strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));

      ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
      if (ret)
            goto err;

      ret = pxa2xx_ac97_hw_probe(dev);
      if (ret)
            goto err;

      ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
      if (ret)
            goto err_remove;
      memset(&ac97_template, 0, sizeof(ac97_template));
      ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
      if (ret)
            goto err_remove;

      snprintf(card->shortname, sizeof(card->shortname),
             "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
      snprintf(card->longname, sizeof(card->longname),
             "%s (%s)", dev->dev.driver->name, card->mixername);

      if (pdata && pdata->codec_data[0])
            snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
      snd_card_set_dev(card, &dev->dev);
      ret = snd_card_register(card);
      if (ret == 0) {
            platform_set_drvdata(dev, card);
            return 0;
      }

err_remove:
      pxa2xx_ac97_hw_remove(dev);
err:
      if (card)
            snd_card_free(card);
err_dev:
      return ret;
}

static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
{
      struct snd_card *card = platform_get_drvdata(dev);

      if (card) {
            snd_card_free(card);
            platform_set_drvdata(dev, NULL);
            pxa2xx_ac97_hw_remove(dev);
      }

      return 0;
}

static struct platform_driver pxa2xx_ac97_driver = {
      .probe            = pxa2xx_ac97_probe,
      .remove           = __devexit_p(pxa2xx_ac97_remove),
      .suspend    = pxa2xx_ac97_suspend,
      .resume           = pxa2xx_ac97_resume,
      .driver           = {
            .name = "pxa2xx-ac97",
            .owner      = THIS_MODULE,
      },
};

static int __init pxa2xx_ac97_init(void)
{
      return platform_driver_register(&pxa2xx_ac97_driver);
}

static void __exit pxa2xx_ac97_exit(void)
{
      platform_driver_unregister(&pxa2xx_ac97_driver);
}

module_init(pxa2xx_ac97_init);
module_exit(pxa2xx_ac97_exit);

MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-ac97");

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