From 29d1a873de542cbb46d0641037d2601cb76be5b1 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 10 May 2017 20:02:35 +0200 Subject: 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 Acked-by: Mark Brown Signed-off-by: Takashi Iwai --- sound/soc/soc-pcm.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'sound/soc') 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; -- cgit v1.2.3