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authorLars-Peter Clausen <lars@metafoo.de>2013-04-15 21:19:51 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-17 17:21:36 +0400
commitc999836d37c6c1125e856f68877ae13952baa61a (patch)
tree77ca9109474b59a6a811e36784f3fed5b3458a2e /sound/soc/soc-generic-dmaengine-pcm.c
parent28c4468b00a1e55e08cc20117de968f7c6275441 (diff)
downloadlinux-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-generic-dmaengine-pcm.c')
-rw-r--r--sound/soc/soc-generic-dmaengine-pcm.c32
1 files changed, 27 insertions, 5 deletions
diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
index acfc92698995..d6e638056389 100644
--- a/sound/soc/soc-generic-dmaengine-pcm.c
+++ b/sound/soc/soc-generic-dmaengine-pcm.c
@@ -29,6 +29,7 @@ struct dmaengine_pcm {
struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1];
const struct snd_dmaengine_pcm_config *config;
struct snd_soc_platform platform;
+ bool compat;
};
static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
@@ -121,6 +122,19 @@ static void dmaengine_pcm_free(struct snd_pcm *pcm)
snd_pcm_lib_preallocate_free_for_all(pcm);
}
+static struct dma_chan *dmaengine_pcm_compat_request_channel(
+ struct snd_soc_pcm_runtime *rtd,
+ struct snd_pcm_substream *substream)
+{
+ struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
+
+ if (pcm->config->compat_request_channel)
+ return pcm->config->compat_request_channel(rtd, substream);
+
+ return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
+ snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
+}
+
static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
@@ -134,6 +148,11 @@ static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
if (!substream)
continue;
+ if (!pcm->chan[i] && pcm->compat) {
+ pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
+ substream);
+ }
+
if (!pcm->chan[i]) {
dev_err(rtd->platform->dev,
"Missing dma channel for stream: %d\n", i);
@@ -171,6 +190,7 @@ static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
.ops = &dmaengine_pcm_ops,
.pcm_new = dmaengine_pcm_new,
.pcm_free = dmaengine_pcm_free,
+ .probe_order = SND_SOC_COMP_ORDER_LATE,
};
static const char * const dmaengine_pcm_dma_channel_names[] = {
@@ -190,18 +210,20 @@ int snd_dmaengine_pcm_register(struct device *dev,
struct dmaengine_pcm *pcm;
unsigned int i;
- if (!dev->of_node)
- return -EINVAL;
-
pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
if (!pcm)
return -ENOMEM;
pcm->config = config;
- for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
- pcm->chan[i] = of_dma_request_slave_channel(dev->of_node,
+ if (flags & SND_DMAENGINE_PCM_FLAG_COMPAT)
+ pcm->compat = true;
+
+ if (!(flags & SND_DMAENGINE_PCM_FLAG_NO_DT) && dev->of_node) {
+ for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
+ pcm->chan[i] = of_dma_request_slave_channel(dev->of_node,
dmaengine_pcm_dma_channel_names[i]);
+ }
}
return snd_soc_add_platform(dev, &pcm->platform,