debugfs: use specified mode to possibly mark files read/write only
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: NRobin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: NMike Frysinger <vapier@gentoo.org> Signed-off-by: NBryan Wu <cooloney@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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