diff options
Diffstat (limited to 'examples')
| -rwxr-xr-x | examples/light_sensors_and_keyboard_backlight.py | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/examples/light_sensors_and_keyboard_backlight.py b/examples/light_sensors_and_keyboard_backlight.py new file mode 100755 index 00000000..1c402b4d --- /dev/null +++ b/examples/light_sensors_and_keyboard_backlight.py @@ -0,0 +1,88 @@ +#!/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 |