sound/soc/tegra/tegra_pcm.c

   1 /*
   2  * tegra_pcm.c - Tegra PCM driver
   3  *
   4  * Author: Stephen Warren <swarren@nvidia.com>
   5  * Copyright (C) 2010,2012 - NVIDIA, Inc.
   6  *
   7  * Based on code copyright/by:
   8  *
   9  * Copyright (c) 2009-2010, NVIDIA Corporation.
  10  * Scott Peterson <speterson@nvidia.com>
  11  * Vijay Mali <vmali@nvidia.com>
  12  *
  13  * Copyright (C) 2010 Google, Inc.
  14  * Iliyan Malchev <malchev@google.com>
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License
  18  * version 2 as published by the Free Software Foundation.
  19  *
  20  * This program is distributed in the hope that it will be useful, but
  21  * WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23  * General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  28  * 02110-1301 USA
  29  *
  30  */
  31
  32 #include <linux/module.h>
  33 #include <sound/core.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/soc.h>
  37 #include <sound/dmaengine_pcm.h>
  38
  39 #include "tegra_pcm.h"
  40
  41 static const struct snd_pcm_hardware tegra_pcm_hardware = {
  42         .info                   = SNDRV_PCM_INFO_MMAP |
  43                                   SNDRV_PCM_INFO_MMAP_VALID |
  44                                   SNDRV_PCM_INFO_INTERLEAVED,
  45         .period_bytes_min       = 1024,
  46         .period_bytes_max       = PAGE_SIZE,
  47         .periods_min            = 2,
  48         .periods_max            = 8,
  49         .buffer_bytes_max       = PAGE_SIZE * 8,
  50         .fifo_size              = 4,
  51 };
  52
  53 static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
  54         .pcm_hardware = &tegra_pcm_hardware,
  55         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  56         .prealloc_buffer_size = PAGE_SIZE * 8,
  57 };
  58
  59 int tegra_pcm_platform_register(struct device *dev)
  60 {
  61         return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
  62 }
  63 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
  64
  65 int tegra_pcm_platform_register_with_chan_names(struct device *dev,
  66                                 struct snd_dmaengine_pcm_config *config,
  67                                 char *txdmachan, char *rxdmachan)
  68 {
  69         *config = tegra_dmaengine_pcm_config;
  70         config->dma_dev = dev->parent;
  71         config->chan_names[0] = txdmachan;
  72         config->chan_names[1] = rxdmachan;
  73
  74         return snd_dmaengine_pcm_register(dev, config, 0);
  75 }
  76 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
  77
  78 void tegra_pcm_platform_unregister(struct device *dev)
  79 {
  80         return snd_dmaengine_pcm_unregister(dev);
  81 }
  82 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
  83
  84 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
  85 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
  86 MODULE_LICENSE("GPL");