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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-12-05 21:50:45 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-12-06 11:05:07 +0100
commitcefcc03ffc9527dde56807339edb1719c8dbae5f (patch)
tree17ead079cf0d1cacdf58a69479025429f5da597f /sound
parentASoC: Remove references to corgi and spitz from machine driver document (diff)
downloadlinux-cefcc03ffc9527dde56807339edb1719c8dbae5f.tar.xz
linux-cefcc03ffc9527dde56807339edb1719c8dbae5f.zip
ASoC: Provide a more complete DMA driver stub
Allow userspace applications to do more parameter setting by providing a more complete stub DMA driver specifying a wildcard set of formats and channels and essentially random values for the DMA parameters. This is required for useful runtime operation of the dummy DMA driver until we are able to figure out how to power up links and do hw_params() from DAPM. Sending to stable as without this the dummy driver is not terribly useful. Reported-by: Kyung-Kwee Ryu <Kyung-Kwee.Ryu@wolfsonmicro.com> Tested-by: Kyung-Kwee Ryu <Kyung-Kwee.Ryu@wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: stable@kernel.org
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/soc-utils.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/sound/soc/soc-utils.c b/sound/soc/soc-utils.c
index 0c12b98484bd..4220bb0f2730 100644
--- a/sound/soc/soc-utils.c
+++ b/sound/soc/soc-utils.c
@@ -58,7 +58,36 @@ int snd_soc_params_to_bclk(struct snd_pcm_hw_params *params)
}
EXPORT_SYMBOL_GPL(snd_soc_params_to_bclk);
-static struct snd_soc_platform_driver dummy_platform;
+static const struct snd_pcm_hardware dummy_dma_hardware = {
+ .formats = 0xffffffff,
+ .channels_min = 1,
+ .channels_max = UINT_MAX,
+
+ /* Random values to keep userspace happy when checking constraints */
+ .info = SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+ .buffer_bytes_max = 128*1024,
+ .period_bytes_min = PAGE_SIZE,
+ .period_bytes_max = PAGE_SIZE*2,
+ .periods_min = 2,
+ .periods_max = 128,
+};
+
+static int dummy_dma_open(struct snd_pcm_substream *substream)
+{
+ snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware);
+
+ return 0;
+}
+
+static struct snd_pcm_ops dummy_dma_ops = {
+ .open = dummy_dma_open,
+ .ioctl = snd_pcm_lib_ioctl,
+};
+
+static struct snd_soc_platform_driver dummy_platform = {
+ .ops = &dummy_dma_ops,
+};
static __devinit int snd_soc_dummy_probe(struct platform_device *pdev)
{