export atomic64_t into /proc/sys/

Hello everyone, In my module, there is an atomic64_t counter for something , such as packets received by Ethernet card. What I want to do is to export this atomic64_t number into /proc/sys/net/ipv4/. The question is atomic64_t is an 64-bit long integer which is not support by kernel's default proc_handlers like proc_dointvec(), proc_dointvec_minmax() and so on. So, Do I have to implement one proc_handler to handle this 64-bit integer? Or you have some better ideas? Any reply will be appreciated and Thanks in advanced.