5e8154332f
The ASoC core assumes that the PCM component of the ASoC card transparently moves data around and does not impose any restrictions on the memory layout or the transfer speed. It ignores all fields from the snd_pcm_hardware struct for the PCM driver that are related to this. Setting these fields in the PCM driver might suggest otherwise though, so rather not set them. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Stephen Warren <swarren@nvidia.com> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/*
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* tegra_pcm.c - Tegra PCM driver
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*
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* Author: Stephen Warren <swarren@nvidia.com>
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* Copyright (C) 2010,2012 - NVIDIA, Inc.
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*
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* Based on code copyright/by:
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*
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* Copyright (c) 2009-2010, NVIDIA Corporation.
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* Scott Peterson <speterson@nvidia.com>
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* Vijay Mali <vmali@nvidia.com>
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*
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* Copyright (C) 2010 Google, Inc.
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* Iliyan Malchev <malchev@google.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include "tegra_pcm.h"
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static const struct snd_pcm_hardware tegra_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED,
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.period_bytes_min = 1024,
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.period_bytes_max = PAGE_SIZE,
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.periods_min = 2,
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.periods_max = 8,
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.buffer_bytes_max = PAGE_SIZE * 8,
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.fifo_size = 4,
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};
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static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
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.pcm_hardware = &tegra_pcm_hardware,
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.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
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.prealloc_buffer_size = PAGE_SIZE * 8,
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};
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int tegra_pcm_platform_register(struct device *dev)
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{
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return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config,
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SND_DMAENGINE_PCM_FLAG_NO_DT |
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SND_DMAENGINE_PCM_FLAG_COMPAT);
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}
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EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
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void tegra_pcm_platform_unregister(struct device *dev)
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{
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return snd_dmaengine_pcm_unregister(dev);
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}
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EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
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MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
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MODULE_DESCRIPTION("Tegra PCM ASoC driver");
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MODULE_LICENSE("GPL");
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