diff options
Diffstat (limited to 'sound/soc/soc-utils.c')
| -rw-r--r-- | sound/soc/soc-utils.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/sound/soc/soc-utils.c b/sound/soc/soc-utils.c index cd987de..241eb05 100644 --- a/sound/soc/soc-utils.c +++ b/sound/soc/soc-utils.c @@ -18,6 +18,9 @@ #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> +#ifdef CONFIG_SLP_WIP +#include <linux/slab.h> +#endif int snd_soc_calc_frame_size(int sample_size, int channels, int tdm_slots) { @@ -72,16 +75,116 @@ static const struct snd_pcm_hardware dummy_dma_hardware = { .periods_max = 128, }; +#ifdef CONFIG_SLP_WIP +struct dma_dummy { + unsigned long base_time; + unsigned long pos; + unsigned long max; +}; +#endif + static int dummy_dma_open(struct snd_pcm_substream *substream) { +#ifdef CONFIG_SLP_WIP + struct snd_pcm_runtime *runtime = substream->runtime; + struct dma_dummy *pdma; + + pdma = kzalloc(sizeof(struct dma_dummy), GFP_KERNEL); + if (!pdma) + return -ENOMEM; + + runtime->private_data = pdma; +#endif snd_soc_set_runtime_hwparams(substream, &dummy_dma_hardware); return 0; } +#ifdef CONFIG_SLP_WIP +static int dummy_dma_close(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct dma_dummy *pdma = runtime->private_data; + + kfree(pdma); + + return 0; +} + +static int dummy_dma_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct dma_dummy *pdma = runtime->private_data; + + pdma->base_time = jiffies; + pdma->pos = 0; + pdma->max = runtime->buffer_size * HZ; + + return 0; +} + +static int dummy_dma_copy(struct snd_pcm_substream *substream, + int channel, snd_pcm_uframes_t pos, + void __user *dst, snd_pcm_uframes_t count) +{ + /* do nothing */ + return 0; +} + +static snd_pcm_uframes_t +dummy_dma_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct dma_dummy *pdma = runtime->private_data; + unsigned long delta; + unsigned long pos; + + delta = jiffies - pdma->base_time; + if (!delta) + return pdma->pos; + + /* update base_time */ + pdma->base_time += delta; + + /* calc */ + delta *= runtime->rate; + pdma->pos += delta; + while (pdma->pos >= pdma->max) + pdma->pos -= pdma->max; + + pos = pdma->pos / HZ; + + return pos; +} + +static int dummy_dma_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct dma_dummy *pdma = runtime->private_data; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + pdma->base_time = jiffies; + break; + default: + break; + } + + return 0; +} +#endif + static struct snd_pcm_ops dummy_dma_ops = { .open = dummy_dma_open, .ioctl = snd_pcm_lib_ioctl, +#ifdef CONFIG_SLP_WIP + .close = dummy_dma_close, + .copy = dummy_dma_copy, + .pointer = dummy_dma_pointer, + .prepare = dummy_dma_prepare, + .trigger = dummy_dma_trigger, +#endif }; static struct snd_soc_platform_driver dummy_platform = { |