78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
"""
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LIRC interface to receive signals from a infrared remote control.
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This sensor will momentarily set state to various values as defined
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in the .lintrc file which can be interpreted in home-assistant to
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trigger various actions.
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Sending signals to other IR receivers can be accomplished with the
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shell_command component and the irsend command for now.
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"""
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# pylint: disable=import-error
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import threading
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import time
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import logging
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from homeassistant.const import EVENT_HOMEASSISTANT_STOP
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DOMAIN = "lirc"
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REQUIREMENTS = ['python-lirc>=1.2.1']
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_LOGGER = logging.getLogger(__name__)
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ICON = 'mdi:remote'
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EVENT_BUTTON_PRESSED = 'button_pressed'
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BUTTON_NAME = 'button_name'
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def setup(hass, config):
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"""Setup LIRC capability."""
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# Perform safe import of third-party python-lirc module
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try:
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import lirc
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except ImportError:
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_LOGGER.error("You are missing a required dependency: python-lirc.")
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return False
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# blocking=True gives unexpected behavior (multiple responses for 1 press)
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# also by not blocking, we allow hass to shut down the thread gracefully
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# on exit.
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lirc.init('home-assistant', blocking=False)
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lirc_interface = LircInterface(hass)
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lirc_interface.start()
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def _stop_lirc(_event):
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lirc_interface.stopped.set()
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hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, _stop_lirc)
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return True
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class LircInterface(threading.Thread):
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"""
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This interfaces with the lirc daemon to read IR commands.
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When using lirc in blocking mode, sometimes repeated commands get produced
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in the next read of a command so we use a thread here to just wait
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around until a non-empty response is obtained from lirc.
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"""
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def __init__(self, hass):
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"""Construct a LIRC interface object."""
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threading.Thread.__init__(self)
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self.stopped = threading.Event()
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self.hass = hass
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def run(self):
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"""Main loop of LIRC interface thread."""
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import lirc
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while not self.stopped.isSet():
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code = lirc.nextcode() # list; empty if no buttons pressed
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# interpret result from python-lirc
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if code:
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code = code[0]
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_LOGGER.info('Got new LIRC code %s', code)
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self.hass.bus.fire(EVENT_BUTTON_PRESSED, {BUTTON_NAME: code})
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else:
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time.sleep(0.1) # avoid high CPU in this thread
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_LOGGER.info('LIRC interface thread stopped')
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