diff options
Diffstat (limited to 'drivers/media/video/cx88/cx88-alsa.c')
| -rw-r--r-- | drivers/media/video/cx88/cx88-alsa.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/media/video/cx88/cx88-alsa.c b/drivers/media/video/cx88/cx88-alsa.c index ac317fb856e..85d632224f3 100644 --- a/drivers/media/video/cx88/cx88-alsa.c +++ b/drivers/media/video/cx88/cx88-alsa.c @@ -28,6 +28,7 @@ #include <linux/init.h> #include <linux/device.h> #include <linux/interrupt.h> +#include <linux/vmalloc.h> #include <linux/dma-mapping.h> #include <linux/pci.h> @@ -423,6 +424,8 @@ static int snd_cx88_hw_params(struct snd_pcm_substream * substream, chip->dma_risc = buf->vb.dma; substream->runtime->dma_area = chip->dma_risc.vmalloc; + substream->runtime->dma_bytes = chip->dma_size; + substream->runtime->dma_addr = 0; return 0; error: @@ -500,6 +503,16 @@ static snd_pcm_uframes_t snd_cx88_pointer(struct snd_pcm_substream *substream) } /* + * page callback (needed for mmap) + */ +static struct page *snd_cx88_page(struct snd_pcm_substream *substream, + unsigned long offset) +{ + void *pageptr = substream->runtime->dma_area + offset; + return vmalloc_to_page(pageptr); +} + +/* * operators */ static struct snd_pcm_ops snd_cx88_pcm_ops = { @@ -511,6 +524,7 @@ static struct snd_pcm_ops snd_cx88_pcm_ops = { .prepare = snd_cx88_prepare, .trigger = snd_cx88_card_trigger, .pointer = snd_cx88_pointer, + .page = snd_cx88_page, }; /* |