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#!/usr/bin/python
#
# Simple program to set the keyboard backlight according to how much
# light is around. This is a very rough example, real production code
# needs to poll much less often and probably fade the backlight from
# 3-4 predefined values instead of jumping around like crazy.
#
# Copyright (C) 2006 David Zeuthen <david@fubar.dk>.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
import dbus
import sys
import time
import os
bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
manager = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
'/org/freedesktop/Hal/Manager'), \
'org.freedesktop.Hal.Manager')
light_sensor_udis = manager.FindDeviceByCapability('light_sensor')
keyboard_backlight_udis = manager.FindDeviceByCapability('keyboard_backlight')
if len(light_sensor_udis) < 1 or len(keyboard_backlight_udis) < 1:
print 'Light sensors: ', light_sensor_udis
print 'Keyboard backlights: ', keyboard_backlight_udis
print ''
print 'This program needs at least one light_sensor and one keyboard_backlight.'
sys.exit(1)
light_sensor_num_sensors = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
light_sensor_udis[0]), \
'org.freedesktop.Hal.Device').GetProperty('light_sensor.num_sensors')
keyboard_backlight_num_levels = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
keyboard_backlight_udis[0]), \
'org.freedesktop.Hal.Device').GetProperty('keyboard_backlight.num_levels')
light_sensor = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
light_sensor_udis[0]), \
'org.freedesktop.Hal.Device.LightSensor')
keyboard_backlight = dbus.Interface(bus.get_object('org.freedesktop.Hal', \
keyboard_backlight_udis[0]), \
'org.freedesktop.Hal.Device.KeyboardBacklight')
clamp = 0.35
last_val_set = -1;
while 1:
try:
levels = light_sensor.GetBrightness()
sum = 0
for l in levels:
sum += l
val = float(sum / light_sensor_num_sensors) / keyboard_backlight_num_levels
if (val > clamp):
val_to_set = 0
else:
val_to_set = (clamp - val) / clamp * (keyboard_backlight_num_levels - 1)
if (val_to_set < 0):
val_to_set = 0
elif val_to_set >= keyboard_backlight_num_levels:
val_to_set = keyboard_backlight_num_levels - 1
if val_to_set != last_val_set:
last_val_set = val_to_set
keyboard_backlight.SetBrightness(val_to_set)
print 'val_to_set is ', val_to_set
time.sleep(0.1)
except Exception, exception:
print exception
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