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In many SoC implementations there are hardware registers can be read or write only. This extends the debugfs to enforce the file permissions for these types of registers by providing a set of fops which are read or write only. This assumes that the kernel developer knows more about the hardware than the user (even root users) -- which is normally true. Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>