LXR linux/sound/soc/tegra/tegra

   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
  41static 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
  53static 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
  59int tegra_pcm_platform_register(struct device *dev)
  60{
  61        return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
  62}
  63EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
  64
  65int 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}
  76EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
  77
  78void tegra_pcm_platform_unregister(struct device *dev)
  79{
  80        return snd_dmaengine_pcm_unregister(dev);
  81}
  82EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
  83
  84MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
  85MODULE_DESCRIPTION("Tegra PCM ASoC driver");
  86MODULE_LICENSE("GPL");
  87