Allocates a new input minor number
int input_get_new_minor(int legacy_base, unsigned int legacy_num, bool allow_dynamic);
legacy_base
beginning or the legacy range to be searched
legacy_num
size of legacy range
allow_dynamic
whether we can also take ID from the dynamic range
This function allocates a new device minor for from input major namespace. Caller can request legacy minor by specifying legacy_base and legacy_num parameters and whether ID can be allocated from dynamic range if there are no free IDs in legacy range.