This is the second and last phase of ensuring that the arguments of write-only
ioctls in V4L2 are const. The first phase was 4-5 months ago and added const
to s_crop, s_modulator, s_audio, s_audout, (un)subscribe_event, s_freq_hw_seek,
s_jpegcomp and s_fbuf.
This second phase adds const to s_frequency, s_tuner, s_std and s_register.
Actually, for s_std it doesn't add const but changes it to pass the std by
value which is more consistent in that particular case.
As a result drivers will be aware when they are implementing write-only ioctls
(and I saw a few drivers attempting to return data back to the user), and the
v4l2 core will know that drivers won't change the argument of a write-only
ioctls which simplifies the core debug code.
The changes have been compile-tested with the linux-media daily build but
I may have missed some more exotic architectures.
Ideally I would like to have this merged fairly early on so we have enough
time to shake out any remaining compile problems.
Regards,
Hans
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