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omap-mcpdm.c

/*
 * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
 *
 * Copyright (C) 2009 Texas Instruments
 *
 * Author: Misael Lopez Cruz <x0052729@ti.com>
 * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
 *          Margarita Olaya <magi.olaya@ti.com>
 *
 * 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.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include <plat/dma.h>
#include <plat/mcbsp.h>
#include "mcpdm.h"
#include "omap-pcm.h"

00040 struct omap_mcpdm_data {
      struct omap_mcpdm_link *links;
      int active;
};

static struct omap_mcpdm_link omap_mcpdm_links[] = {
      /* downlink */
      {
            .irq_mask = MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL,
            .threshold = 1,
            .format = PDMOUTFORMAT_LJUST,
      },
      /* uplink */
      {
            .irq_mask = MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL,
            .threshold = 1,
            .format = PDMOUTFORMAT_LJUST,
      },
};

static struct omap_mcpdm_data mcpdm_data = {
      .links = omap_mcpdm_links,
      .active = 0,
};

/*
 * Stream DMA parameters
 */
static struct omap_pcm_dma_data omap_mcpdm_dai_dma_params[] = {
      {
            .name = "Audio playback",
            .dma_req = OMAP44XX_DMA_MCPDM_DL,
            .data_type = OMAP_DMA_DATA_TYPE_S32,
            .sync_mode = OMAP_DMA_SYNC_PACKET,
            .packet_size = 16,
            .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_DN_DATA,
      },
      {
            .name = "Audio capture",
            .dma_req = OMAP44XX_DMA_MCPDM_UP,
            .data_type = OMAP_DMA_DATA_TYPE_S32,
            .sync_mode = OMAP_DMA_SYNC_PACKET,
            .packet_size = 16,
            .port_addr = OMAP44XX_MCPDM_L3_BASE + MCPDM_UP_DATA,
      },
};

static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
                          struct snd_soc_dai *dai)
{
      int err = 0;

      if (!dai->active)
            err = omap_mcpdm_request();

      return err;
}

static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
                            struct snd_soc_dai *dai)
{
      if (!dai->active)
            omap_mcpdm_free();
}

static int omap_mcpdm_dai_trigger(struct snd_pcm_substream *substream, int cmd,
                          struct snd_soc_dai *dai)
{
      struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
      int stream = substream->stream;
      int err = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            if (!mcpdm_priv->active++)
                  omap_mcpdm_start(stream);
            break;

      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            if (!--mcpdm_priv->active)
                  omap_mcpdm_stop(stream);
            break;
      default:
            err = -EINVAL;
      }

      return err;
}

static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
                            struct snd_pcm_hw_params *params,
                            struct snd_soc_dai *dai)
{
      struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
      struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
      int stream = substream->stream;
      int channels, err, link_mask = 0;

      snd_soc_dai_set_dma_data(dai, substream,
                         &omap_mcpdm_dai_dma_params[stream]);

      channels = params_channels(params);
      switch (channels) {
      case 4:
            if (stream == SNDRV_PCM_STREAM_CAPTURE)
                  /* up to 2 channels for capture */
                  return -EINVAL;
            link_mask |= 1 << 3;
      case 3:
            if (stream == SNDRV_PCM_STREAM_CAPTURE)
                  /* up to 2 channels for capture */
                  return -EINVAL;
            link_mask |= 1 << 2;
      case 2:
            link_mask |= 1 << 1;
      case 1:
            link_mask |= 1 << 0;
            break;
      default:
            /* unsupported number of channels */
            return -EINVAL;
      }

      if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
            mcpdm_links[stream].channels = link_mask << 3;
            err = omap_mcpdm_playback_open(&mcpdm_links[stream]);
      } else {
            mcpdm_links[stream].channels = link_mask << 0;
            err = omap_mcpdm_capture_open(&mcpdm_links[stream]);
      }

      return err;
}

static int omap_mcpdm_dai_hw_free(struct snd_pcm_substream *substream,
                          struct snd_soc_dai *dai)
{
      struct omap_mcpdm_data *mcpdm_priv = snd_soc_dai_get_drvdata(dai);
      struct omap_mcpdm_link *mcpdm_links = mcpdm_priv->links;
      int stream = substream->stream;
      int err;

      if (substream->stream ==  SNDRV_PCM_STREAM_PLAYBACK)
            err = omap_mcpdm_playback_close(&mcpdm_links[stream]);
      else
            err = omap_mcpdm_capture_close(&mcpdm_links[stream]);

      return err;
}

static struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
      .startup    = omap_mcpdm_dai_startup,
      .shutdown   = omap_mcpdm_dai_shutdown,
      .trigger    = omap_mcpdm_dai_trigger,
      .hw_params  = omap_mcpdm_dai_hw_params,
      .hw_free    = omap_mcpdm_dai_hw_free,
};

#define OMAP_MCPDM_RATES      (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
#define OMAP_MCPDM_FORMATS    (SNDRV_PCM_FMTBIT_S32_LE)

static int omap_mcpdm_dai_probe(struct snd_soc_dai *dai)
{
      snd_soc_dai_set_drvdata(dai, &mcpdm_data);
      return 0;
}

static struct snd_soc_dai_driver omap_mcpdm_dai = {
      .probe = omap_mcpdm_dai_probe,
      .playback = {
            .channels_min = 1,
            .channels_max = 4,
            .rates = OMAP_MCPDM_RATES,
            .formats = OMAP_MCPDM_FORMATS,
      },
      .capture = {
            .channels_min = 1,
            .channels_max = 2,
            .rates = OMAP_MCPDM_RATES,
            .formats = OMAP_MCPDM_FORMATS,
      },
      .ops = &omap_mcpdm_dai_ops,
};

static __devinit int asoc_mcpdm_probe(struct platform_device *pdev)
{
      int ret;

      ret = omap_mcpdm_probe(pdev);
      if (ret < 0)
            return ret;
      ret = snd_soc_register_dai(&pdev->dev, &omap_mcpdm_dai);
      if (ret < 0)
            omap_mcpdm_remove(pdev);
      return ret;
}

static int __devexit asoc_mcpdm_remove(struct platform_device *pdev)
{
      snd_soc_unregister_dai(&pdev->dev);
      omap_mcpdm_remove(pdev);
      return 0;
}

static struct platform_driver asoc_mcpdm_driver = {
      .driver = {
                  .name = "omap-mcpdm-dai",
                  .owner = THIS_MODULE,
      },

      .probe = asoc_mcpdm_probe,
      .remove = __devexit_p(asoc_mcpdm_remove),
};

static int __init snd_omap_mcpdm_init(void)
{
      return platform_driver_register(&asoc_mcpdm_driver);
}
module_init(snd_omap_mcpdm_init);

static void __exit snd_omap_mcpdm_exit(void)
{
      platform_driver_unregister(&asoc_mcpdm_driver);
}
module_exit(snd_omap_mcpdm_exit);

MODULE_AUTHOR("Misael Lopez Cruz <x0052729@ti.com>");
MODULE_DESCRIPTION("OMAP PDM SoC Interface");
MODULE_LICENSE("GPL");

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