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Diffstat (limited to 'sound/soc/tegra/tegra_pcm.c')
| -rw-r--r-- | sound/soc/tegra/tegra_pcm.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c new file mode 100644 index 000000000..93caed500 --- /dev/null +++ b/sound/soc/tegra/tegra_pcm.c @@ -0,0 +1,86 @@ +/* + * tegra_pcm.c - Tegra PCM driver + * + * Author: Stephen Warren <swarren@nvidia.com> + * Copyright (C) 2010,2012 - NVIDIA, Inc. + * + * Based on code copyright/by: + * + * Copyright (c) 2009-2010, NVIDIA Corporation. + * Scott Peterson <speterson@nvidia.com> + * Vijay Mali <vmali@nvidia.com> + * + * Copyright (C) 2010 Google, Inc. + * Iliyan Malchev <malchev@google.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/module.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/dmaengine_pcm.h> + +#include "tegra_pcm.h" + +static const struct snd_pcm_hardware tegra_pcm_hardware = { + .info = SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID | + SNDRV_PCM_INFO_INTERLEAVED, + .period_bytes_min = 1024, + .period_bytes_max = PAGE_SIZE, + .periods_min = 2, + .periods_max = 8, + .buffer_bytes_max = PAGE_SIZE * 8, + .fifo_size = 4, +}; + +static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = { + .pcm_hardware = &tegra_pcm_hardware, + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, + .prealloc_buffer_size = PAGE_SIZE * 8, +}; + +int tegra_pcm_platform_register(struct device *dev) +{ + return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0); +} +EXPORT_SYMBOL_GPL(tegra_pcm_platform_register); + +int tegra_pcm_platform_register_with_chan_names(struct device *dev, + struct snd_dmaengine_pcm_config *config, + char *txdmachan, char *rxdmachan) +{ + *config = tegra_dmaengine_pcm_config; + config->dma_dev = dev->parent; + config->chan_names[0] = txdmachan; + config->chan_names[1] = rxdmachan; + + return snd_dmaengine_pcm_register(dev, config, 0); +} +EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names); + +void tegra_pcm_platform_unregister(struct device *dev) +{ + return snd_dmaengine_pcm_unregister(dev); +} +EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister); + +MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); +MODULE_DESCRIPTION("Tegra PCM ASoC driver"); +MODULE_LICENSE("GPL"); |