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authorTakashi Iwai <tiwai@suse.de>2009-01-16 12:15:22 -0500
committerTakashi Iwai <tiwai@suse.de>2009-03-09 09:56:19 -0400
commitf5b1db634280ecaf3147ee996f26aad0ed4828c4 (patch)
treece7ba0940e5dd3f106276d9119f7e7e3a3b0c7e6 /include
parentfec6c6fec3e20637bee5d276fb61dd8b49a3f9cc (diff)
ALSA: add snd_ctl_add_slave_uncached()
Added snd_ctl_add_slave_uncached() function to add a slave element with volatile controls. The values of normal slave elements are supposed to be cachable, i.e. they are changed only via the put callbacks. OTOH, when a slave element is volatile and its values may be changed by other reason (e.g. hardware status change), the values will get inconsistent. The new function allows the slave elements with volatile changes. When the slave is tied with this call, the native get callback is issued at each time so that the values are always updated. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/sound/control.h20
1 files changed, 18 insertions, 2 deletions
diff --git a/include/sound/control.h b/include/sound/control.h
index 4721b4bba053..4cf8f7aaa13f 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -171,6 +171,22 @@ int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
171 */ 171 */
172struct snd_kcontrol *snd_ctl_make_virtual_master(char *name, 172struct snd_kcontrol *snd_ctl_make_virtual_master(char *name,
173 const unsigned int *tlv); 173 const unsigned int *tlv);
174int snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave); 174int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,
175 175 unsigned int flags);
176/* optional flags for slave */
177#define SND_CTL_SLAVE_NEED_UPDATE (1 << 0)
178
179static inline int
180snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave)
181{
182 return _snd_ctl_add_slave(master, slave, 0);
183}
184
185static inline int
186snd_ctl_add_slave_uncached(struct snd_kcontrol *master,
187 struct snd_kcontrol *slave)
188{
189 return _snd_ctl_add_slave(master, slave, SND_CTL_SLAVE_NEED_UPDATE);
190}
191
176#endif /* __SOUND_CONTROL_H */ 192#endif /* __SOUND_CONTROL_H */