From f6210c9160dff82ceaaf5e59cf5f8fcd6bdefa38 Mon Sep 17 00:00:00 2001 From: Trent Piepho Date: Fri, 24 Aug 2007 01:06:36 -0300 Subject: [PATCH] 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx88/cx88-alsa.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) 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 #include #include +#include #include #include @@ -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: @@ -499,6 +502,16 @@ static snd_pcm_uframes_t snd_cx88_pointer(struct snd_pcm_substream *substream) return runtime->period_size * (count & (runtime->periods-1)); } +/* + * 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 */ @@ -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, }; /* -- 2.41.0