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Richard Fitzgerald <rf@opensource.cirrus.com> says: Factory calibration is normally done through debugfs files. Google have requested that factory calibration can be performed by repair shops. These repair shops only have access to the standard "user" kernel, which does not include debugfs. Patch #1 adds a new control definition macro to create a boolean control with specified access permissions. (new in V2) Patch #2 is the implementation in the cs35l56 driver.