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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 /sound/soc/soc-pcm.c
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 'sound/soc/soc-pcm.c')
-rw-r--r--sound/soc/soc-pcm.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index efc5831f205d..8867ed9e5f56 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -2743,6 +2743,9 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
if (platform->driver->ops) {
rtd->ops.ack = platform->driver->ops->ack;
+ rtd->ops.copy_user = platform->driver->ops->copy_user;
+ rtd->ops.copy_kernel = platform->driver->ops->copy_kernel;
+ rtd->ops.fill_silence = platform->driver->ops->fill_silence;
rtd->ops.copy = platform->driver->ops->copy;
rtd->ops.silence = platform->driver->ops->silence;
rtd->ops.page = platform->driver->ops->page;