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When changing the state of the WR servo we can call a hook (function pointer) to a function defined by a user in the upper layer (wrpc-sw). The purpose of the hook is to add new functionalities when we reach a specific state (Alarms, IRIGB, etc...) without needing to change the code of PPSI. [This is a rework of the original patch by Benoit. Mainly, I added the extra integer argument to the hook (so I call it twice: both entering and leaving the servo), and I removed the function to set the hook from wrpc: the main function can set the pointer directly] Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
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