Logo Search packages:      
Sourcecode: alsa-driver version File versions  Download package

sst_platform.c

/*
 *  sst_platform.c - Intel MID Platform driver
 *
 *  Copyright (C) 2010 Intel Corp
 *  Author: Vinod Koul <vinod.koul@intel.com>
 *  Author: Harsha Priya <priya.harsha@intel.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; version 2 of the License.
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/slab.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "../../../drivers/staging/intel_sst/intel_sst_ioctl.h"
#include "../../../drivers/staging/intel_sst/intel_sst.h"
#include "sst_platform.h"

static struct snd_pcm_hardware sst_platform_pcm_hw = {
      .info =     (SNDRV_PCM_INFO_INTERLEAVED |
                  SNDRV_PCM_INFO_DOUBLE |
                  SNDRV_PCM_INFO_PAUSE |
                  SNDRV_PCM_INFO_RESUME |
                  SNDRV_PCM_INFO_MMAP|
                  SNDRV_PCM_INFO_MMAP_VALID |
                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
                  SNDRV_PCM_INFO_SYNC_START),
      .formats = (SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_U16 |
                  SNDRV_PCM_FMTBIT_S24 | SNDRV_PCM_FMTBIT_U24 |
                  SNDRV_PCM_FMTBIT_S32 | SNDRV_PCM_FMTBIT_U32),
      .rates = (SNDRV_PCM_RATE_8000|
                  SNDRV_PCM_RATE_44100 |
                  SNDRV_PCM_RATE_48000),
      .rate_min = SST_MIN_RATE,
      .rate_max = SST_MAX_RATE,
      .channels_min =   SST_MIN_CHANNEL,
      .channels_max =   SST_MAX_CHANNEL,
      .buffer_bytes_max = SST_MAX_BUFFER,
      .period_bytes_min = SST_MIN_PERIOD_BYTES,
      .period_bytes_max = SST_MAX_PERIOD_BYTES,
      .periods_min = SST_MIN_PERIODS,
      .periods_max = SST_MAX_PERIODS,
      .fifo_size = SST_FIFO_SIZE,
};

/* MFLD - MSIC */
struct snd_soc_dai_driver sst_platform_dai[] = {
{
      .name = "Headset-cpu-dai",
      .id = 0,
      .playback = {
            .channels_min = SST_STEREO,
            .channels_max = SST_STEREO,
            .rates = SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_S24_LE,
      },
},
{
      .name = "Speaker-cpu-dai",
      .id = 1,
      .playback = {
            .channels_min = SST_MONO,
            .channels_max = SST_STEREO,
            .rates = SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_S24_LE,
      },
},
{
      .name = "Vibra1-cpu-dai",
      .id = 2,
      .playback = {
            .channels_min = SST_MONO,
            .channels_max = SST_MONO,
            .rates = SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_S24_LE,
      },
},
{
      .name = "Vibra2-cpu-dai",
      .id = 3,
      .playback = {
            .channels_min = SST_MONO,
            .channels_max = SST_STEREO,
            .rates = SNDRV_PCM_RATE_48000,
            .formats = SNDRV_PCM_FMTBIT_S24_LE,
      },
},
};

/* helper functions */
static inline void sst_set_stream_status(struct sst_runtime_stream *stream,
                              int state)
{
      spin_lock(&stream->status_lock);
      stream->stream_status = state;
      spin_unlock(&stream->status_lock);
}

static inline int sst_get_stream_status(struct sst_runtime_stream *stream)
{
      int state;

      spin_lock(&stream->status_lock);
      state = stream->stream_status;
      spin_unlock(&stream->status_lock);
      return state;
}

static void sst_fill_pcm_params(struct snd_pcm_substream *substream,
                        struct snd_sst_stream_params *param)
{

      param->uc.pcm_params.codec = SST_CODEC_TYPE_PCM;
      param->uc.pcm_params.num_chan = (u8) substream->runtime->channels;
      param->uc.pcm_params.pcm_wd_sz = substream->runtime->sample_bits;
      param->uc.pcm_params.reserved = 0;
      param->uc.pcm_params.sfreq = substream->runtime->rate;
      param->uc.pcm_params.ring_buffer_size =
                              snd_pcm_lib_buffer_bytes(substream);
      param->uc.pcm_params.period_count = substream->runtime->period_size;
      param->uc.pcm_params.ring_buffer_addr =
                        virt_to_phys(substream->dma_buffer.area);
      pr_debug("period_cnt = %d\n", param->uc.pcm_params.period_count);
      pr_debug("sfreq= %d, wd_sz = %d\n",
             param->uc.pcm_params.sfreq, param->uc.pcm_params.pcm_wd_sz);
}

static int sst_platform_alloc_stream(struct snd_pcm_substream *substream)
{
      struct sst_runtime_stream *stream =
                  substream->runtime->private_data;
      struct snd_sst_stream_params param = {{{0,},},};
      struct snd_sst_params str_params = {0};
      int ret_val;

      /* set codec params and inform SST driver the same */
      sst_fill_pcm_params(substream, &param);
      substream->runtime->dma_area = substream->dma_buffer.area;
      str_params.sparams = param;
      str_params.codec =  param.uc.pcm_params.codec;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            str_params.ops = STREAM_OPS_PLAYBACK;
            str_params.device_type = substream->pcm->device + 1;
            pr_debug("Playbck stream,Device %d\n",
                              substream->pcm->device);
      } else {
            str_params.ops = STREAM_OPS_CAPTURE;
            str_params.device_type = SND_SST_DEVICE_CAPTURE;
            pr_debug("Capture stream,Device %d\n",
                              substream->pcm->device);
      }
      ret_val = stream->sstdrv_ops->pcm_control->open(&str_params);
      pr_debug("SST_SND_PLAY/CAPTURE ret_val = %x\n", ret_val);
      if (ret_val < 0)
            return ret_val;

      stream->stream_info.str_id = ret_val;
      pr_debug("str id :  %d\n", stream->stream_info.str_id);
      return ret_val;
}

static void sst_period_elapsed(void *mad_substream)
{
      struct snd_pcm_substream *substream = mad_substream;
      struct sst_runtime_stream *stream;
      int status;

      if (!substream || !substream->runtime)
            return;
      stream = substream->runtime->private_data;
      if (!stream)
            return;
      status = sst_get_stream_status(stream);
      if (status != SST_PLATFORM_RUNNING)
            return;
      snd_pcm_period_elapsed(substream);
}

static int sst_platform_init_stream(struct snd_pcm_substream *substream)
{
      struct sst_runtime_stream *stream =
                  substream->runtime->private_data;
      int ret_val;

      pr_debug("setting buffer ptr param\n");
      sst_set_stream_status(stream, SST_PLATFORM_INIT);
      stream->stream_info.period_elapsed = sst_period_elapsed;
      stream->stream_info.mad_substream = substream;
      stream->stream_info.buffer_ptr = 0;
      stream->stream_info.sfreq = substream->runtime->rate;
      ret_val = stream->sstdrv_ops->pcm_control->device_control(
                  SST_SND_STREAM_INIT, &stream->stream_info);
      if (ret_val)
            pr_err("control_set ret error %d\n", ret_val);
      return ret_val;

}
/* end -- helper functions */

static int sst_platform_open(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime;
      struct sst_runtime_stream *stream;
      int ret_val = 0;

      pr_debug("sst_platform_open called\n");
      runtime = substream->runtime;
      runtime->hw = sst_platform_pcm_hw;
      stream = kzalloc(sizeof(*stream), GFP_KERNEL);
      if (!stream)
            return -ENOMEM;
      spin_lock_init(&stream->status_lock);
      stream->stream_info.str_id = 0;
      sst_set_stream_status(stream, SST_PLATFORM_INIT);
      stream->stream_info.mad_substream = substream;
      /* allocate memory for SST API set */
      stream->sstdrv_ops = kzalloc(sizeof(*stream->sstdrv_ops),
                                          GFP_KERNEL);
      if (!stream->sstdrv_ops) {
            pr_err("sst: mem allocation for ops fail\n");
            kfree(stream);
            return -ENOMEM;
      }
      stream->sstdrv_ops->vendor_id = MSIC_VENDOR_ID;
      /* registering with SST driver to get access to SST APIs to use */
      ret_val = register_sst_card(stream->sstdrv_ops);
      if (ret_val) {
            pr_err("sst: sst card registration failed\n");
            return ret_val;
      }
      runtime->private_data = stream;
      return snd_pcm_hw_constraint_integer(runtime,
                   SNDRV_PCM_HW_PARAM_PERIODS);
}

static int sst_platform_close(struct snd_pcm_substream *substream)
{
      struct sst_runtime_stream *stream;
      int ret_val = 0, str_id;

      pr_debug("sst_platform_close called\n");
      stream = substream->runtime->private_data;
      str_id = stream->stream_info.str_id;
      if (str_id)
            ret_val = stream->sstdrv_ops->pcm_control->close(str_id);
      kfree(stream->sstdrv_ops);
      kfree(stream);
      return ret_val;
}

static int sst_platform_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct sst_runtime_stream *stream;
      int ret_val = 0, str_id;

      pr_debug("sst_platform_pcm_prepare called\n");
      stream = substream->runtime->private_data;
      str_id = stream->stream_info.str_id;
      if (stream->stream_info.str_id) {
            ret_val = stream->sstdrv_ops->pcm_control->device_control(
                              SST_SND_DROP, &str_id);
            return ret_val;
      }

      ret_val = sst_platform_alloc_stream(substream);
      if (ret_val < 0)
            return ret_val;
      snprintf(substream->pcm->id, sizeof(substream->pcm->id),
                  "%d", stream->stream_info.str_id);

      ret_val = sst_platform_init_stream(substream);
      if (ret_val)
            return ret_val;
      substream->runtime->hw.info = SNDRV_PCM_INFO_BLOCK_TRANSFER;
      return ret_val;
}

static int sst_platform_pcm_trigger(struct snd_pcm_substream *substream,
                              int cmd)
{
      int ret_val = 0, str_id;
      struct sst_runtime_stream *stream;
      int str_cmd, status;

      pr_debug("sst_platform_pcm_trigger called\n");
      stream = substream->runtime->private_data;
      str_id = stream->stream_info.str_id;
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            pr_debug("sst: Trigger Start\n");
            str_cmd = SST_SND_START;
            status = SST_PLATFORM_RUNNING;
            stream->stream_info.mad_substream = substream;
            break;
      case SNDRV_PCM_TRIGGER_STOP:
            pr_debug("sst: in stop\n");
            str_cmd = SST_SND_DROP;
            status = SST_PLATFORM_DROPPED;
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            pr_debug("sst: in pause\n");
            str_cmd = SST_SND_PAUSE;
            status = SST_PLATFORM_PAUSED;
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            pr_debug("sst: in pause release\n");
            str_cmd = SST_SND_RESUME;
            status = SST_PLATFORM_RUNNING;
            break;
      default:
            return -EINVAL;
      }
      ret_val = stream->sstdrv_ops->pcm_control->device_control(str_cmd,
                                                &str_id);
      if (!ret_val)
            sst_set_stream_status(stream, status);

      return ret_val;
}


static snd_pcm_uframes_t sst_platform_pcm_pointer
                  (struct snd_pcm_substream *substream)
{
      struct sst_runtime_stream *stream;
      int ret_val, status;
      struct pcm_stream_info *str_info;

      stream = substream->runtime->private_data;
      status = sst_get_stream_status(stream);
      if (status == SST_PLATFORM_INIT)
            return 0;
      str_info = &stream->stream_info;
      ret_val = stream->sstdrv_ops->pcm_control->device_control(
                        SST_SND_BUFFER_POINTER, str_info);
      if (ret_val) {
            pr_err("sst: error code = %d\n", ret_val);
            return ret_val;
      }
      return stream->stream_info.buffer_ptr;
}


static struct snd_pcm_ops sst_platform_ops = {
      .open = sst_platform_open,
      .close = sst_platform_close,
      .ioctl = snd_pcm_lib_ioctl,
      .prepare = sst_platform_pcm_prepare,
      .trigger = sst_platform_pcm_trigger,
      .pointer = sst_platform_pcm_pointer,
};

static void sst_pcm_free(struct snd_pcm *pcm)
{
      pr_debug("sst_pcm_free called\n");
      snd_pcm_lib_preallocate_free_for_all(pcm);
}

int sst_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
                  struct snd_pcm *pcm)
{
      int retval = 0;

      pr_debug("sst_pcm_new called\n");
      if (dai->driver->playback.channels_min ||
                  dai->driver->capture.channels_min) {
            retval =  snd_pcm_lib_preallocate_pages_for_all(pcm,
                  SNDRV_DMA_TYPE_CONTINUOUS,
                  snd_dma_continuous_data(GFP_KERNEL),
                  SST_MIN_BUFFER, SST_MAX_BUFFER);
            if (retval) {
                  pr_err("dma buffer allocationf fail\n");
                  return retval;
            }
      }
      return retval;
}
struct snd_soc_platform_driver sst_soc_platform_drv = {
      .ops        = &sst_platform_ops,
      .pcm_new    = sst_pcm_new,
      .pcm_free   = sst_pcm_free,
};

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

      pr_debug("sst_platform_probe called\n");
      ret = snd_soc_register_platform(&pdev->dev, &sst_soc_platform_drv);
      if (ret) {
            pr_err("registering soc platform failed\n");
            return ret;
      }

      ret = snd_soc_register_dais(&pdev->dev,
                        sst_platform_dai, ARRAY_SIZE(sst_platform_dai));
      if (ret) {
            pr_err("registering cpu dais failed\n");
            snd_soc_unregister_platform(&pdev->dev);
      }
      return ret;
}

static int sst_platform_remove(struct platform_device *pdev)
{

      snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(sst_platform_dai));
      snd_soc_unregister_platform(&pdev->dev);
      pr_debug("sst_platform_remove sucess\n");
      return 0;
}

static struct platform_driver sst_platform_driver = {
      .driver           = {
            .name       = "sst-platform",
            .owner            = THIS_MODULE,
      },
      .probe            = sst_platform_probe,
      .remove           = sst_platform_remove,
};

static int __init sst_soc_platform_init(void)
{
      pr_debug("sst_soc_platform_init called\n");
      return  platform_driver_register(&sst_platform_driver);
}
module_init(sst_soc_platform_init);

static void __exit sst_soc_platform_exit(void)
{
      platform_driver_unregister(&sst_platform_driver);
      pr_debug("sst_soc_platform_exit sucess\n");
}
module_exit(sst_soc_platform_exit);

MODULE_DESCRIPTION("ASoC Intel(R) MID Platform driver");
MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sst-platform");

Generated by  Doxygen 1.6.0   Back to index