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| author | Trent Piepho <xyzzy@speakeasy.org> | 2007-08-24 06:06:36 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-10-10 03:06:37 +0200 |
| commit | f6210c9160dff82ceaaf5e59cf5f8fcd6bdefa38 (patch) | |
| tree | 14583f207bf08163a97f2ed61a3b93d17fc22f85 /drivers/media/video/cx88/cx88-alsa.c | |
| parent | V4L/DVB (6084): cx88-alsa: Eliminate snd_cx88_cards (diff) | |
| download | linux-f6210c9160dff82ceaaf5e59cf5f8fcd6bdefa38.tar.xz linux-f6210c9160dff82ceaaf5e59cf5f8fcd6bdefa38.zip | |
V4L/DVB (6085): cx88-alsa: Fix mmap support
The driver has long claimed to support mmap, but it didn't work at all. Some
of the dma buffer parameters weren't set, and since video_buf uses vmalloc to
allocate the buffer, a page callback is needed too.
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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 ac317fb856e4..85d632224f3a 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, }; /* |