# This file is part of photoframe (https://github.com/mrworf/photoframe).
#
# photoframe is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# photoframe is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with photoframe. If not, see <http://www.gnu.org/licenses/>.
#
from threading import Thread
import select
import subprocess
import os
import socket
import logging
class shutdown(Thread):
def __init__(self, usePIN=26):
Thread.__init__(self)
self.daemon = True
self.gpio = usePIN
self.void = open(os.devnull, 'wb')
self.client, self.server = socket.socketpair()
self.start()
def stopmonitor(self):
self.client.close()
def run(self):
logging.info('GPIO shutdown can be triggered by GPIO %d', self.gpio)
# Shutdown can be initated from GPIO26
poller = select.poll()
try:
with open('/sys/class/gpio/export', 'wb') as f:
f.write('%d' % self.gpio)
except:
# Usually it means we ran this before
pass
try:
with open('/sys/class/gpio/gpio%d/direction' % self.gpio, 'wb') as f:
f.write('in')
except:
logging.warn('Either no GPIO subsystem or no access')
return
with open('/sys/class/gpio/gpio%d/edge' % self.gpio, 'wb') as f:
f.write('both')
with open('/sys/class/gpio/gpio%d/active_low' % self.gpio, 'wb') as f:
f.write('1')
with open('/sys/class/gpio/gpio%d/value' % self.gpio, 'rb') as f:
f.read()
poller.register(f, select.POLLPRI)
poller.register(self.server, select.POLLHUP)
i = poller.poll(None)
for (fd, event) in i:
if f.fileno() == fd:
subprocess.call(['/sbin/poweroff'], stderr=self.void);
logging.debug('Shutdown GPIO triggered')
elif self.server.fileno() == fd:
logging.debug('Quitting shutdown manager')
