[SmartcardServices-Users] Will a reader driver other than ifd-ccid.bundle for MacOX10.9 work

hello！ We know that we can write a pcsc reader driver on MacOSX10.10 and higher system. Can I write one for MacOSX10.9 and MacOSX10.8，I write one and put in /usr/local/libexec/SmartCardServices/drivers but it doesn't work. Is it possible to write a customer reader driver ? Thank you