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author | Takashi Iwai <tiwai@suse.de> | 2017-05-10 20:02:35 +0200 |
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committer | Takashi Iwai <tiwai@suse.de> | 2017-06-02 19:37:23 +0200 |
commit | 29d1a873de542cbb46d0641037d2601cb76be5b1 (patch) | |
tree | 7139a700857874a25081c00dd0af4e1c85e6fb18 /sound/soc/soc-pcm.c | |
parent | 7421a1671abe5bc07cc7a09f5a1be45acc403db7 (diff) | |
download | linux-29d1a873de542cbb46d0641037d2601cb76be5b1.tar.gz linux-29d1a873de542cbb46d0641037d2601cb76be5b1.tar.bz2 linux-29d1a873de542cbb46d0641037d2601cb76be5b1.zip |
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.c | 3 |
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; |