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authorTakashi Iwai <tiwai@suse.de>2014-07-16 19:45:27 +0400
committerTakashi Iwai <tiwai@suse.de>2014-07-21 11:07:46 +0400
commit589008106b9b64153554c8f3f120ee512b134bb5 (patch)
tree087d7b1197dcc6933a87f82d84f955345b126c74 /include/uapi/sound/asound.h
parent5646eda5851e6cfdfa22d41895e3f5daffa643d3 (diff)
downloadlinux-589008106b9b64153554c8f3f120ee512b134bb5.tar.xz
ALSA: pcm: Introduce protocol version field to sw_params
For controlling the new fields more strictly, add sw_params.proto field indicating the protocol version of the user-space. User-space should fill the SNDRV_PCM_VERSION value it's built with, then kernel can know whether the new fields should be evaluated or not. And now tstamp_type field is evaluated only when the valid value is set there. This avoids the wrong override of tstamp_type to zero, which is SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/uapi/sound/asound.h')
-rw-r--r--include/uapi/sound/asound.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index a7e062f91f39..32168f7ffce3 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -391,8 +391,8 @@ struct snd_pcm_sw_params {
snd_pcm_uframes_t silence_threshold; /* min distance from noise for silence filling */
snd_pcm_uframes_t silence_size; /* silence block size */
snd_pcm_uframes_t boundary; /* pointers wrap point */
- unsigned int tstamp_type; /* timestamp type */
- int pads; /* alignment, reserved */
+ unsigned int proto; /* protocol version */
+ unsigned int tstamp_type; /* timestamp type (req. proto >= 2.0.12) */
unsigned char reserved[56]; /* reserved for future */
};