#!/usr/bin/env python3 # vim: set expandtab shiftwidth=4: # -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */ # # Copyright © 2017 Red Hat, Inc. # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the "Software"), # to deal in the Software without restriction, including without limitation # the rights to use, copy, modify, merge, publish, distribute, sublicense, # and/or sell copies of the Software, and to permit persons to whom the # Software is furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice (including the next # paragraph) shall be included in all copies or substantial portions of the # Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER # DEALINGS IN THE SOFTWARE. # import sys import subprocess import argparse try: import libevdev import pyudev except ModuleNotFoundError as e: print('Error: {}'.format(str(e)), file=sys.stderr) print('One or more python modules are missing. Please install those ' 'modules and re-run this tool.') sys.exit(1) class TableFormatter(object): ALIGNMENT = 3 def __init__(self): self.colwidths = [] @property def width(self): return sum(self.colwidths) + 1 def headers(self, args): s = '|' align = self.ALIGNMENT - 1 # account for | for arg in args: # +2 because we want space left/right of text w = ((len(arg) + 2 + align) // align) * align self.colwidths.append(w + 1) s += ' {:^{width}s} |'.format(arg, width=w - 2) return s def values(self, args): s = '|' for w, arg in zip(self.colwidths, args): w -= 1 # width includes | separator if type(arg) == str: # We want space margins for strings s += ' {:{width}s} |'.format(arg, width=w - 2) elif type(arg) == bool: s += '{:^{width}s}|'.format('x' if arg else ' ', width=w) else: s += '{:^{width}d}|'.format(arg, width=w) if len(args) < len(self.colwidths): s += '|'.rjust(self.width - len(s), ' ') return s def separator(self): return '+' + '-' * (self.width - 2) + '+' fmt = TableFormatter() class Range(object): """Class to keep a min/max of a value around""" def __init__(self): self.min = float('inf') self.max = float('-inf') def update(self, value): self.min = min(self.min, value) self.max = max(self.max, value) class Touch(object): """A single data point of a sequence (i.e. one event frame)""" def __init__(self, pressure=None): self.pressure = pressure class TouchSequence(object): """A touch sequence from beginning to end""" def __init__(self, device, tracking_id): self.device = device self.tracking_id = tracking_id self.points = [] self.is_active = True self.is_down = False self.was_down = False self.is_palm = False self.was_palm = False self.is_thumb = False self.was_thumb = False self.prange = Range() def append(self, touch): """Add a Touch to the sequence""" self.points.append(touch) self.prange.update(touch.pressure) if touch.pressure < self.device.up: self.is_down = False elif touch.pressure > self.device.down: self.is_down = True self.was_down = True self.is_palm = touch.pressure > self.device.palm if self.is_palm: self.was_palm = True self.is_thumb = touch.pressure > self.device.thumb if self.is_thumb: self.was_thumb = True def finalize(self): """Mark the TouchSequence as complete (finger is up)""" self.is_active = False def avg(self): """Average pressure value of this sequence""" return int(sum([p.pressure for p in self.points]) / len(self.points)) def median(self): """Median pressure value of this sequence""" ps = sorted([p.pressure for p in self.points]) idx = int(len(self.points) / 2) return ps[idx] def __str__(self): return self._str_state() if self.is_active else self._str_summary() def _str_summary(self): if not self.points: return fmt.values([self.tracking_id, False, False, False, False, 'No pressure values recorded']) s = fmt.values([self.tracking_id, self.was_down, True, self.was_palm, self.was_thumb, self.prange.min, self.prange.max, 0, self.avg(), self.median()]) return s def _str_state(self): s = fmt.values([self.tracking_id, self.is_down, not self.is_down, self.is_palm, self.is_thumb, self.prange.min, self.prange.max, self.points[-1].pressure]) return s class InvalidDeviceError(Exception): pass class Device(libevdev.Device): def __init__(self, path): if path is None: self.path = self.find_touchpad_device() else: self.path = path fd = open(self.path, 'rb') super().__init__(fd) print("Using {}: {}\n".format(self.name, self.path)) self.has_mt_pressure = True absinfo = self.absinfo[libevdev.EV_ABS.ABS_MT_PRESSURE] if absinfo is None: absinfo = self.absinfo[libevdev.EV_ABS.ABS_PRESSURE] self.has_mt_pressure = False if absinfo is None: raise InvalidDeviceError("Device does not have ABS_PRESSURE or ABS_MT_PRESSURE") prange = absinfo.maximum - absinfo.minimum # libinput defaults self.down = int(absinfo.minimum + 0.12 * prange) self.up = int(absinfo.minimum + 0.10 * prange) self.palm = 130 # the libinput default self.thumb = absinfo.maximum self._init_thresholds_from_quirks() self.sequences = [] def find_touchpad_device(self): context = pyudev.Context() for device in context.list_devices(subsystem='input'): if not device.get('ID_INPUT_TOUCHPAD', 0): continue if not device.device_node or \ not device.device_node.startswith('/dev/input/event'): continue return device.device_node print("Unable to find a touchpad device.", file=sys.stderr) sys.exit(1) def _init_thresholds_from_quirks(self): command = ['libinput', 'quirks', 'list', self.path] cmd = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE) if cmd.returncode != 0: print("Error querying quirks: {}".format(cmd.stderr.decode('utf-8')), file=sys.stderr) return stdout = cmd.stdout.decode('utf-8') quirks = [q.split('=') for q in stdout.split('\n')] for q in quirks: if q[0] == 'AttrPalmPressureThreshold': self.palm = int(q[1]) elif q[0] == 'AttrPressureRange': self.down, self.up = colon_tuple(q[1]) elif q[0] == 'AttrThumbPressureThreshold': self.thumb = int(q[1]) def start_new_sequence(self, tracking_id): self.sequences.append(TouchSequence(self, tracking_id)) def current_sequence(self): return self.sequences[-1] def handle_key(device, event): tapcodes = [ libevdev.EV_KEY.BTN_TOOL_DOUBLETAP, libevdev.EV_KEY.BTN_TOOL_TRIPLETAP, libevdev.EV_KEY.BTN_TOOL_QUADTAP, libevdev.EV_KEY.BTN_TOOL_QUINTTAP ] if event.code in tapcodes and event.value > 0: print('\r\033[2KThis tool cannot handle multiple fingers, ' 'output will be invalid') def handle_abs(device, event): if event.matches(libevdev.EV_ABS.ABS_MT_TRACKING_ID): if event.value > -1: device.start_new_sequence(event.value) else: try: s = device.current_sequence() s.finalize() print("\r\033[2K{}".format(s)) except IndexError: # If the finger was down at startup pass elif (event.matches(libevdev.EV_ABS.ABS_MT_PRESSURE) or (event.matches(libevdev.EV_ABS.ABS_PRESSURE) and not device.has_mt_pressure)): try: s = device.current_sequence() s.append(Touch(pressure=event.value)) print("\r\033[2K{}".format(s), end="") except IndexError: # If the finger was down at startup pass def handle_event(device, event): if event.matches(libevdev.EV_ABS): handle_abs(device, event) elif event.matches(libevdev.EV_KEY): handle_key(device, event) def loop(device): print('This is an interactive tool') print() print("Place a single finger on the touchpad to measure pressure values.") print('Check that:') print('- touches subjectively perceived as down are tagged as down') print('- touches with a thumb are tagged as thumb') print('- touches with a palm are tagged as palm') print() print('If the touch states do not match the interaction, re-run') print('with --touch-thresholds=down:up using observed pressure values.') print('See --help for more options.') print() print("Press Ctrl+C to exit") print() headers = fmt.headers(['Touch', 'down', 'up', 'palm', 'thumb', 'min', 'max', 'p', 'avg', 'median']) print(fmt.separator()) print(fmt.values(['Thresh', device.down, device.up, device.palm, device.thumb])) print(fmt.separator()) print(headers) print(fmt.separator()) while True: for event in device.events(): handle_event(device, event) def colon_tuple(string): try: ts = string.split(':') t = tuple([int(x) for x in ts]) if len(t) == 2 and t[0] >= t[1]: return t except: # noqa pass msg = "{} is not in format N:M (N >= M)".format(string) raise argparse.ArgumentTypeError(msg) def main(args): parser = argparse.ArgumentParser( description="Measure touchpad pressure values" ) parser.add_argument( 'path', metavar='/dev/input/event0', nargs='?', type=str, help='Path to device (optional)' ) parser.add_argument( '--touch-thresholds', metavar='down:up', type=colon_tuple, help='Thresholds when a touch is logically down or up' ) parser.add_argument( '--palm-threshold', metavar='t', type=int, help='Threshold when a touch is a palm' ) parser.add_argument( '--thumb-threshold', metavar='t', type=int, help='Threshold when a touch is a thumb' ) args = parser.parse_args() try: device = Device(args.path) if args.touch_thresholds is not None: device.down, device.up = args.touch_thresholds if args.palm_threshold is not None: device.palm = args.palm_threshold if args.thumb_threshold is not None: device.thumb = args.thumb_threshold loop(device) except KeyboardInterrupt: print('\r\033[2K{}'.format(fmt.separator())) print() except (PermissionError, OSError): print("Error: failed to open device") except InvalidDeviceError as e: print("This device does not have the capabilities for pressure-based touch detection.") print("Details: {}".format(e)) if __name__ == "__main__": main(sys.argv)