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