[alsa-devel] [RFC 7/7] ASoC: ep93xx-pcm: Use dmaengine PCM helper functions
Lars-Peter Clausen
lars at metafoo.de
Wed Feb 22 10:49:11 CET 2012
Signed-off-by: Lars-Peter Clausen <lars at metafoo.de>
---
sound/soc/ep93xx/Kconfig | 1 +
sound/soc/ep93xx/ep93xx-pcm.c | 148 ++++++-----------------------------------
2 files changed, 23 insertions(+), 126 deletions(-)
diff --git a/sound/soc/ep93xx/Kconfig b/sound/soc/ep93xx/Kconfig
index 91a28de..88143db 100644
--- a/sound/soc/ep93xx/Kconfig
+++ b/sound/soc/ep93xx/Kconfig
@@ -1,6 +1,7 @@
config SND_EP93XX_SOC
tristate "SoC Audio support for the Cirrus Logic EP93xx series"
depends on ARCH_EP93XX && SND_SOC
+ select SND_SOC_DMAENGINE_PCM
help
Say Y or M if you want to add support for codecs attached to
the EP93xx I2S or AC97 interfaces.
diff --git a/sound/soc/ep93xx/ep93xx-pcm.c b/sound/soc/ep93xx/ep93xx-pcm.c
index 32adca3..162dbb7 100644
--- a/sound/soc/ep93xx/ep93xx-pcm.c
+++ b/sound/soc/ep93xx/ep93xx-pcm.c
@@ -23,6 +23,7 @@
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
#include <mach/dma.h>
#include <mach/hardware.h>
@@ -52,26 +53,6 @@ static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
.fifo_size = 32,
};
-struct ep93xx_runtime_data
-{
- int pointer_bytes;
- int periods;
- int period_bytes;
- struct dma_chan *dma_chan;
- struct ep93xx_dma_data dma_data;
-};
-
-static void ep93xx_pcm_dma_callback(void *data)
-{
- struct snd_pcm_substream *substream = data;
- struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
-
- rtd->pointer_bytes += rtd->period_bytes;
- rtd->pointer_bytes %= rtd->period_bytes * rtd->periods;
-
- snd_pcm_period_elapsed(substream);
-}
-
static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
{
struct ep93xx_dma_data *data = filter_param;
@@ -86,98 +67,48 @@ static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
{
- struct snd_soc_pcm_runtime *soc_rtd = substream->private_data;
- struct snd_soc_dai *cpu_dai = soc_rtd->cpu_dai;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
struct ep93xx_pcm_dma_params *dma_params;
- struct ep93xx_runtime_data *rtd;
- dma_cap_mask_t mask;
+ struct ep93xx_dma_data *dma_data;
int ret;
- ret = snd_pcm_hw_constraint_integer(substream->runtime,
- SNDRV_PCM_HW_PARAM_PERIODS);
- if (ret < 0)
- return ret;
-
snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
- rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
- if (!rtd)
+ dma_data = kmalloc(sizeof(*dma_data), GFP_KERNEL);
+ if (!dma_data)
return -ENOMEM;
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- dma_cap_set(DMA_CYCLIC, mask);
-
dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
- rtd->dma_data.port = dma_params->dma_port;
- rtd->dma_data.name = dma_params->name;
-
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- rtd->dma_data.direction = DMA_MEM_TO_DEV;
- else
- rtd->dma_data.direction = DMA_DEV_TO_MEM;
-
- rtd->dma_chan = dma_request_channel(mask, ep93xx_pcm_dma_filter,
- &rtd->dma_data);
- if (!rtd->dma_chan) {
- kfree(rtd);
- return -EINVAL;
- }
-
- substream->runtime->private_data = rtd;
- return 0;
-}
+ dma_data->port = dma_params->dma_port;
+ dma_data->name = dma_params->name;
+ dma_data->direction = snd_pcm_substream_to_dma_direction(substream);
-static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
-{
- struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
+ ret = snd_dmaengine_pcm_open(substream, ep93xx_pcm_dma_filter, dma_data);
+ if (ret) {
+ kfree(dma_data);
+ return ret;
+ }
- dma_release_channel(rtd->dma_chan);
- kfree(rtd);
- return 0;
-}
+ snd_dmaengine_pcm_set_data(substream, dma_data);
-static int ep93xx_pcm_dma_submit(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct ep93xx_runtime_data *rtd = runtime->private_data;
- struct dma_chan *chan = rtd->dma_chan;
- struct dma_device *dma_dev = chan->device;
- struct dma_async_tx_descriptor *desc;
-
- rtd->pointer_bytes = 0;
- desc = dma_dev->device_prep_dma_cyclic(chan, runtime->dma_addr,
- rtd->period_bytes * rtd->periods,
- rtd->period_bytes,
- rtd->dma_data.direction);
- if (!desc)
- return -EINVAL;
-
- desc->callback = ep93xx_pcm_dma_callback;
- desc->callback_param = substream;
-
- dmaengine_submit(desc);
return 0;
}
-static void ep93xx_pcm_dma_flush(struct snd_pcm_substream *substream)
+static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct ep93xx_runtime_data *rtd = runtime->private_data;
+ struct dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
- dmaengine_terminate_all(rtd->dma_chan);
+ snd_dmaengine_pcm_close(substream);
+ kfree(dma_data);
+ return 0;
}
static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct ep93xx_runtime_data *rtd = runtime->private_data;
-
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
- rtd->periods = params_periods(params);
- rtd->period_bytes = params_period_bytes(params);
return 0;
}
@@ -187,41 +118,6 @@ static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
return 0;
}
-static int ep93xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
-{
- int ret;
-
- ret = 0;
- switch (cmd) {
- case SNDRV_PCM_TRIGGER_START:
- case SNDRV_PCM_TRIGGER_RESUME:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- ret = ep93xx_pcm_dma_submit(substream);
- break;
-
- case SNDRV_PCM_TRIGGER_STOP:
- case SNDRV_PCM_TRIGGER_SUSPEND:
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- ep93xx_pcm_dma_flush(substream);
- break;
-
- default:
- ret = -EINVAL;
- break;
- }
-
- return ret;
-}
-
-static snd_pcm_uframes_t ep93xx_pcm_pointer(struct snd_pcm_substream *substream)
-{
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct ep93xx_runtime_data *rtd = substream->runtime->private_data;
-
- /* FIXME: implement this with sub-period granularity */
- return bytes_to_frames(runtime, rtd->pointer_bytes);
-}
-
static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
@@ -239,8 +135,8 @@ static struct snd_pcm_ops ep93xx_pcm_ops = {
.ioctl = snd_pcm_lib_ioctl,
.hw_params = ep93xx_pcm_hw_params,
.hw_free = ep93xx_pcm_hw_free,
- .trigger = ep93xx_pcm_trigger,
- .pointer = ep93xx_pcm_pointer,
+ .trigger = snd_dmaengine_pcm_trigger,
+ .pointer = snd_dmaengine_pcm_pointer,
.mmap = ep93xx_pcm_mmap,
};
--
1.7.9
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