hdaps.py

   1 '''
   2 Python bindings for the HDAPS interface
   3 '''
   4
   5 # Copyright: 2008-2009 Evgeni Golov <sargentd@die-welt.net>
   6 # License: GPL-2
   7
   8 import struct
   9 import os.path
  10
  11 __SYSFS_HDAPS='/sys/devices/platform/hdaps'
  12 __SYSFS_HDAPS_CALIBRATION='%s/calibrate' % __SYSFS_HDAPS
  13 __SYSFS_HDAPS_POSITION='%s/position' % __SYSFS_HDAPS
  14 __SYSFS_HDAPS_KEYBOARD_ACTIVITY='%s/keyboard_activity' % __SYSFS_HDAPS
  15 __SYSFS_HDAPS_MOUSE_ACTIVITY='%s/mouse_activity' % __SYSFS_HDAPS
  16 __INPUT_HDAPS_EVENT='/dev/input/hdaps/accelerometer-event'
  17
  18 def readPosition(calibrate=False):
  19         if calibrate:
  20                 filename = __SYSFS_HDAPS_CALIBRATION
  21         else:
  22                 filename = __SYSFS_HDAPS_POSITION
  23         line = __readSysfs(filename).strip(')(')
  24         posX,posY = line.split(',')
  25         return (int(posX), int(posY))
  26
  27 def readKeyboardActivity():
  28         return int(__readSysfs(__SYSFS_HDAPS_KEYBOARD_ACTIVITY))
  29
  30 def readMouseActivity():
  31         return int(__readSysfs(__SYSFS_HDAPS_MOUSE_ACTIVITY))
  32
  33 def __readSysfs(filename):
  34         try:
  35                 fd = file(filename, 'r')
  36                 line = fd.readline().strip()
  37                 fd.close()
  38         except IOError:
  39                 raise IOError, '%s could not be read, is the "hdaps" module loaded?' % filename
  40         return line
  41
  42 def hasInputInterface():
  43         return os.path.exists(__INPUT_HDAPS_EVENT)
  44
  45 def readInputPosition(callback):
  46         if not hasInputInterface():
  47                 raise IOError, 'You don\'t have %s. Is the "hdaps" module from tp_smapi loaded?' % __INPUT_HDAPS_EVENT
  48         x = 0
  49         y = 0
  50         input = open(__INPUT_HDAPS_EVENT,"rb")
  51         event = input.read(16)
  52         while event:
  53                 (tv_sec, tv_usec, type, code, value) = struct.unpack('iihhi',event)
  54                 if type == 3:
  55                         if code == 0:
  56                                 x = value
  57                         if code == 1:
  58                                 y = value
  59                 if type == 0 and code == 0:
  60                         callback(x, y)
  61                 event = input.read(16)
  62         input.close()