diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2013-04-15 19:19:50 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-17 14:21:25 +0100 |
| commit | 28c4468b00a1e55e08cc20117de968f7c6275441 (patch) | |
| tree | 47bd04d6a4e80c632ddfae202e6aa0c3375f21ea /include/sound/dmaengine_pcm.h | |
| parent | 71a45cda444f9c47bd63516cf4c24fb6d1ccb151 (diff) | |
| download | linux-28c4468b00a1e55e08cc20117de968f7c6275441.tar.bz2 | |
ASoC: Add a generic dmaengine_pcm driver
This patch adds a generic dmaengine PCM driver. It builds on top of the
dmaengine PCM library and adds the missing pieces like DMA channel management,
buffer management and channel configuration. It will be able to replace the
majority of the existing platform specific dmaengine based PCM drivers.
Devicetree is used to map the DMA channels to the PCM device.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/sound/dmaengine_pcm.h')
| -rw-r--r-- | include/sound/dmaengine_pcm.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h index d015d67e75c3..e0bf24e90669 100644 --- a/include/sound/dmaengine_pcm.h +++ b/include/sound/dmaengine_pcm.h @@ -72,4 +72,29 @@ void snd_dmaengine_pcm_set_config_from_dai_data( const struct snd_dmaengine_dai_dma_data *dma_data, struct dma_slave_config *config); +/** + * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM + * @prepare_slave_config: Callback used to fill in the DMA slave_config for a + * PCM substream. Will be called from the PCM drivers hwparams callback. + * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM. + * @prealloc_buffer_size: Size of the preallocated audio buffer. + */ +struct snd_dmaengine_pcm_config { + int (*prepare_slave_config)(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct dma_slave_config *slave_config); + + const struct snd_pcm_hardware *pcm_hardware; + unsigned int prealloc_buffer_size; +}; + +int snd_dmaengine_pcm_register(struct device *dev, + const struct snd_dmaengine_pcm_config *config, + unsigned int flags); +void snd_dmaengine_pcm_unregister(struct device *dev); + +int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct dma_slave_config *slave_config); + #endif |