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The unit depends on the poll type parameter. When sleep, 0 to indicate 'don't sleep'; all other values are treated as max number of microseconds to allow sleep (could sleep for less, but never more). Return 0xFFFFFFFF f you don't care. When hid-off/deep-sleep, 0 to indicate 'don't enter deep-sleep'; all other values are treated as OK to enter deep-sleep (not guaranteed to enter deep-sleep because some other module could block deep-sleep).