diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2013-04-15 21:19:51 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-17 17:21:36 +0400 |
| commit | c999836d37c6c1125e856f68877ae13952baa61a (patch) | |
| tree | 77ca9109474b59a6a811e36784f3fed5b3458a2e /sound/soc/soc-dmaengine-pcm.c | |
| parent | 28c4468b00a1e55e08cc20117de968f7c6275441 (diff) | |
| download | linux-c999836d37c6c1125e856f68877ae13952baa61a.tar.xz | |
ASoC: dmaengine_pcm: Add support for compat platforms
Add support for platforms which don't use devicetree yet or have to optionally
support a non-devicetree way to request the DMA channel. The patch adds the
compat_request_channel and compat_filter_fn callbacks to the
snd_dmaengine_pcm_config struct. If the compat_request_channel is implemented it
will be used to request the DMA channel. If not dma_request_channel with
compat_filter_fn as the filter function will be used to request the channel.
The patch also exports the snd_dmaengine_pcm_request_chan() function, since
compat platforms will want to use it to request their DMA channel.
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 'sound/soc/soc-dmaengine-pcm.c')
| -rw-r--r-- | sound/soc/soc-dmaengine-pcm.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c index b0420a75f412..aa924d9b7986 100644 --- a/sound/soc/soc-dmaengine-pcm.c +++ b/sound/soc/soc-dmaengine-pcm.c @@ -254,7 +254,16 @@ snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer); -static struct dma_chan *dmaengine_pcm_request_channel(dma_filter_fn filter_fn, +/** + * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM + * @filter_fn: Filter function used to request the DMA channel + * @filter_data: Data passed to the DMA filter function + * + * Returns NULL or the requested DMA channel. + * + * This function request a DMA channel for usage with dmaengine PCM. + */ +struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, void *filter_data) { dma_cap_mask_t mask; @@ -265,6 +274,7 @@ static struct dma_chan *dmaengine_pcm_request_channel(dma_filter_fn filter_fn, return dma_request_channel(mask, filter_fn, filter_data); } +EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel); /** * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream @@ -320,7 +330,7 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, dma_filter_fn filter_fn, void *filter_data) { return snd_dmaengine_pcm_open(substream, - dmaengine_pcm_request_channel(filter_fn, filter_data)); + snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); |