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authorTakashi Iwai <tiwai@suse.de>2017-05-10 21:02:35 +0300
committerTakashi Iwai <tiwai@suse.de>2017-06-02 20:37:23 +0300
commit29d1a873de542cbb46d0641037d2601cb76be5b1 (patch)
tree7139a700857874a25081c00dd0af4e1c85e6fb18 /include/sound
parent7421a1671abe5bc07cc7a09f5a1be45acc403db7 (diff)
downloadlinux-29d1a873de542cbb46d0641037d2601cb76be5b1.tar.xz
ALSA: pcm: Introduce copy_user, copy_kernel and fill_silence ops
For supporting the explicit in-kernel copy of PCM buffer data, and also for further code refactoring, three new PCM ops, copy_user, copy_kernel and fill_silence, are introduced. The old copy and silence ops will be deprecated and removed later once when all callers are converted. The copy_kernel ops is the new one, and it's supposed to transfer the PCM data from the given kernel buffer to the hardware ring-buffer (or vice-versa depending on the stream direction), while the copy_user ops is equivalent with the former copy ops, to transfer the data from the user-space buffer. The major difference of the new copy_* and fill_silence ops from the previous ops is that the new ops take bytes instead of frames for size and position arguments. It has two merits: first, it allows the callback implementation often simpler (just call directly memcpy() & co), and second, it may unify the implementations of both interleaved and non-interleaved cases, as we'll see in the later patch. As of this stage, copy_kernel ops isn't referred yet, but only copy_user is used. Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Acked-by: Mark Brown <broonie@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/pcm.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 79fedf517070..86b126be49a2 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -83,6 +83,13 @@ struct snd_pcm_ops {
void __user *buf, snd_pcm_uframes_t count);
int (*silence)(struct snd_pcm_substream *substream, int channel,
snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
+ int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
+ unsigned long pos, unsigned long bytes);
+ int (*copy_user)(struct snd_pcm_substream *substream, int channel,
+ unsigned long pos, void __user *buf,
+ unsigned long bytes);
+ int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
+ unsigned long pos, void *buf, unsigned long bytes);
struct page *(*page)(struct snd_pcm_substream *substream,
unsigned long offset);
int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);