kernel/sound/soc/mxs/mxs-pcm.c

   1 /*
   2  * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
   3  *
   4  * Based on sound/soc/imx/imx-pcm-dma-mx2.c
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/pcm.h>
  27 #include <sound/soc.h>
  28 #include <sound/dmaengine_pcm.h>
  29
  30 #include "mxs-pcm.h"
  31
  32 static const struct snd_pcm_hardware snd_mxs_hardware = {
  33         .info                   = SNDRV_PCM_INFO_MMAP |
  34                                   SNDRV_PCM_INFO_MMAP_VALID |
  35                                   SNDRV_PCM_INFO_PAUSE |
  36                                   SNDRV_PCM_INFO_RESUME |
  37                                   SNDRV_PCM_INFO_INTERLEAVED |
  38                                   SNDRV_PCM_INFO_HALF_DUPLEX,
  39         .period_bytes_min       = 32,
  40         .period_bytes_max       = 8192,
  41         .periods_min            = 1,
  42         .periods_max            = 52,
  43         .buffer_bytes_max       = 64 * 1024,
  44         .fifo_size              = 32,
  45 };
  46
  47 static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = {
  48         .pcm_hardware = &snd_mxs_hardware,
  49         .prealloc_buffer_size = 64 * 1024,
  50 };
  51
  52 int mxs_pcm_platform_register(struct device *dev)
  53 {
  54         return devm_snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config,
  55                 SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX);
  56 }
  57 EXPORT_SYMBOL_GPL(mxs_pcm_platform_register);
  58
  59 MODULE_LICENSE("GPL");