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From: Takashi Sakamoto <>
Subject: [alsa-devel] [PATCH for-5.6 1/4] ALSA: ctl: remove unused macro for timestamping of elem_value
Date: Mon, 23 Dec 2019 11:39:18 +0900
Message-ID: <> (raw)
In-Reply-To: <>

In a former commit, 'tstamp' member was removed from 'struct
snd_ctl_elem_value' in a middle way toward solution of Y2038 issue. In a
protocol of ALSA control interface, this member is designed to deliver
timestamp information in the value structure when the target element

Actually, the feature is neither used by kernel space nor user space,
especiall alsa-lib has no API for the feature. Therefore it's reasonable
to remove both of them. Practically, the timestamp information
corresponds to no information about type of clock ID. It can bring
confusions to applications.

Reference: a4e7dd35b9da ("ALSA: Avoid using timespec for struct snd_ctl_elem_value")
Signed-off-by: Takashi Sakamoto <>
 include/uapi/sound/asound.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index e7943302359e..efd9e1398e07 100644
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -974,7 +974,7 @@ typedef int __bitwise snd_ctl_elem_iface_t;
 #define SNDRV_CTL_ELEM_ACCESS_VOLATILE		(1<<2)	/* control value may be changed without a notification */
-#define SNDRV_CTL_ELEM_ACCESS_TIMESTAMP		(1<<3)	/* when was control changed */
+// (1 << 3) is unused.
 #define SNDRV_CTL_ELEM_ACCESS_TLV_READ		(1<<4)	/* TLV read is possible */
 #define SNDRV_CTL_ELEM_ACCESS_TLV_WRITE		(1<<5)	/* TLV write is possible */

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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-23  2:39 [alsa-devel] [PATCH for-5.6 0/4] ALSA: ctl: UAPI updates for obsoleted members Takashi Sakamoto
2019-12-23  2:39 ` Takashi Sakamoto [this message]
2019-12-23  2:39 ` [alsa-devel] [PATCH for-5.6 2/4] ALSA: pci: echoaudio: remove usage of dimen menber of elem_value structure Takashi Sakamoto
2019-12-23  2:39 ` [alsa-devel] [PATCH for-5.6 3/4] ALSA: ctl: remove dimen member from elem_info structure Takashi Sakamoto
2019-12-23  2:39 ` [alsa-devel] [PATCH for-5.6 4/4] ALSA: ctl: bump protocol version up to v2.1.0 Takashi Sakamoto
2019-12-23 15:03 ` [alsa-devel] [PATCH for-5.6 0/4] ALSA: ctl: UAPI updates for obsoleted members Takashi Iwai

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