Ambiguous specification regarding valid audmode value for radio tuners

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Hi all,

While working on the v4l2-compliance tool I came across an ambiguous 
specification.

The question is whether VIDIOC_S_TUNER should accept audmode values other
then MONO and STEREO for FM radio devices.

On the one hand the description of VIDIOC_S_TUNER says:

"Drivers may choose a different audio mode if the requested mode is invalid or 
unsupported."

On the other hand the clearly mention that the non-MONO and -STEREO modes are 
for analog TV only.

The return code description says that -EINVAL is only returned in case of an 
invalid index value.

I'm inclined to say that for radio devices any audmodes other than MONO and 
STEREO should cause a -EINVAL error.

Alternatively we could define that any other audmodes are accepted but map to 
STEREO instead.

Comments?

	Hans
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