diff options
author | Clemens Ladisch <clemens@ladisch.de> | 2011-01-10 16:25:44 +0100 |
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committer | Takashi Iwai <tiwai@suse.de> | 2011-01-10 16:46:53 +0100 |
commit | 9600732b6caba595f34acf2abd930098ec9a0b2b (patch) | |
tree | 7474e1b11894623186a2acd47a388aa87fdd002e /sound/core/control.c | |
parent | b532d6b8d3aa163e1dc143bc729e9ee92f75baf5 (diff) | |
download | linux-9600732b6caba595f34acf2abd930098ec9a0b2b.tar.bz2 |
ALSA: core, oxygen, virtuoso: add an enum control info helper
Introduce the helper function snd_ctl_enum_info() to fill out the
elem_info fields for an enumerated control.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/control.c')
-rw-r--r-- | sound/core/control.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/sound/core/control.c b/sound/core/control.c index 45a818002d99..9ce00ed20fba 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -1488,7 +1488,7 @@ int snd_ctl_create(struct snd_card *card) } /* - * Frequently used control callbacks + * Frequently used control callbacks/helpers */ int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) @@ -1513,3 +1513,29 @@ int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, } EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); + +/** + * snd_ctl_enum_info - fills the info structure for an enumerated control + * @info: the structure to be filled + * @channels: the number of the control's channels; often one + * @items: the number of control values; also the size of @names + * @names: an array containing the names of all control values + * + * Sets all required fields in @info to their appropriate values. + * If the control's accessibility is not the default (readable and writable), + * the caller has to fill @info->access. + */ +int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, + unsigned int items, const char *const names[]) +{ + info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; + info->count = channels; + info->value.enumerated.items = items; + if (info->value.enumerated.item >= items) + info->value.enumerated.item = items - 1; + strlcpy(info->value.enumerated.name, + names[info->value.enumerated.item], + sizeof(info->value.enumerated.name)); + return 0; +} +EXPORT_SYMBOL(snd_ctl_enum_info); |