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How to acces TVP5150 .command function from userspace


I am working with a video capture chip TVP5150. I want to adjust the
"Brightness" "Contrast" "Saturation" and "hue" in user space.
In TVP5150 drivers ,the V4l2 commands are in function tvp5150_command.And
this function is a member of struct i2c_device.

The linux is
I write my code according kernel document  Documentation/i2c/dev-interface
But I can`t access tvp5150_command.
How can i acces i2c_device .command  function from user space?

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