Question about signal of struct v4l2_tuner

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Hi,

i saw a comment about signal field of struct v4l2_tuner from
http://linuxtv.org/downloads/v4l-dvb-apis/vidioc-g-tuner.html#v4l2-tuner

__u32   signal  The signal strength if known, ranging from 0 to 65535.
Higher values indicate a better signal.

Some v4l2 radio drivers use directly signal strength value(unit: dbµV)
reading from hardware and some drivers transform the signal value to
above range from 0 to 65535.

I wonder which thing is proper way.

Thank.

-- 
- Joonyoung Shim
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