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#!/usr/bin/env python
# Copyright 2014 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Dump DAPM widgets status as a 'dot' graph file.
To generate widget status for a device run
ssh $REMOTE asoc_dapm_graph > dot.txt && dot -Kfdp -Tpng dot.txt -o widgets.png
"""
from __future__ import print_function
import os
import platform
import re
import sys
import time
ROOTDIR = '/sys/kernel/debug/asoc/'
# Some widget names are widely used by many codecs, adding them to the graph
# creates a mess.
IGNORE_WIDGETS = ('Playback', 'Capture', 'bias_level')
def handle_widgets(path):
"""Reads DAPM widget information from sysfs and generates dot graph entry.
Args:
path: path for sysfs file that exports information about DAPM widget.
"""
for w in os.listdir(path):
if w in IGNORE_WIDGETS:
continue
with open(os.path.join(path, w)) as f:
lines = f.readlines()
active = lines[0].startswith(w + ': On ')
color = 'green' if active else 'red'
print('\t"%s" [color = %s]' % (w, color))
for l in lines[1:]:
l = l.rstrip()
# The string format is (in/out) "switch" "widget".
edge = list(filter(None, re.split(r' (in|out) "(.+)" "(.+)"', l)))
if len(edge) != 3:
continue
direction = edge[0]
source = edge[2]
if source in IGNORE_WIDGETS:
continue
# We need to output the edge only once (e.g. inbound).
if direction != 'in':
continue
print('\t"%s" -> "%s"' % (source, w))
def handle_card(path):
"""Generates dot graph file for the given card.
Args:
path: path to sysfs directory that exports DAPM information for a sound card.
"""
host = platform.uname()[1]
print('// Generated %s at %s.' % (time.strftime("%c"), host))
print('// To visualize the graph run "dot -Kfdp -Tpng $SCRIPT_OUTPUT_FILE -o widgets.png".')
print('digraph G {')
print('\tbgcolor = grey')
for root, dirs, files in os.walk(path):
if 'dapm' in dirs:
handle_widgets(os.path.join(root, 'dapm'))
dirs.remove('dapm')
print('}')
def main(argv):
for c in os.listdir(ROOTDIR):
path = os.path.join(ROOTDIR, c)
# We assume that directories in ROOTDIR are cards.
if os.path.isdir(path):
handle_card(path)
sys.exit(0)
print('No cards found', file=sys.stderr)
sys.exit(1)
if __name__ == '__main__':
main(sys.argv[1:])
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