• ACTIVE_HIGH : gpiod::line
• ACTIVE_LOW : gpiod::line
• BIAS_AS_IS : gpiod::line
• BIAS_DISABLE : gpiod::line
• BIAS_PULL_DOWN : gpiod::line
• BIAS_PULL_UP : gpiod::line
• DIRECTION_AS_IS : gpiod::line_request
• DIRECTION_INPUT : gpiod::line , gpiod::line_request
• DIRECTION_OUTPUT : gpiod::line , gpiod::line_request
• EVENT_BOTH_EDGES : gpiod::line_request
• EVENT_FALLING_EDGE : gpiod::line_request
• EVENT_RISING_EDGE : gpiod::line_request
• FALLING_EDGE : gpiod::line_event
• OPEN_BY_LABEL : gpiod::chip
• OPEN_BY_NAME : gpiod::chip
• OPEN_BY_NUMBER : gpiod::chip
• OPEN_BY_PATH : gpiod::chip
• OPEN_LOOKUP : gpiod::chip
• RISING_EDGE : gpiod::line_event