Man page 9 : snd_ctl_enum_info

snd_ctl_enum_info - fills the info structure for an enumerated control

int snd_ctl_enum_info(struct snd_ctl_elem_info *  info , unsigned int  channels , unsigned int  items , const char *const  names[] );

info
    the structure to be filled

channels
    the number of the controlAqs 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 controlAqs accessibility is not the default (readable and writable), the caller has to fill info->access.

Zero.