• sub_debug_level : lib/libsub.c , libsub.c
• sub_dev_cache : libsub.c , lib/libsub.c
• sub_errlist : lib/libsub.c , libsub.c
• sub_errno : lib/libsub.h , libsub.c , libsub.h , lib/libsub.c
• sub_i2c_status : libsub.h , lib/libsub.c , lib/libsub.h , libsub.c