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9fd690efb3
- Update the year in the copyrights to match the last year the file was modified. - Add the copyright header to files that did not already have one.
90 lines
3.6 KiB
Python
90 lines
3.6 KiB
Python
# Copyright 2015-2017 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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from __future__ import division
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import re
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from devlib.instrument import Instrument, Measurement, INSTANTANEOUS
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from devlib.exception import TargetError
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class HwmonInstrument(Instrument):
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name = 'hwmon'
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mode = INSTANTANEOUS
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# sensor kind --> (meaure, standard unit conversion)
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measure_map = {
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'temp': ('temperature', lambda x: x / 1000),
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'in': ('voltage', lambda x: x / 1000),
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'curr': ('current', lambda x: x / 1000),
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'power': ('power', lambda x: x / 1000000),
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'energy': ('energy', lambda x: x / 1000000),
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}
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def __init__(self, target):
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if not hasattr(target, 'hwmon'):
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raise TargetError('Target does not support HWMON')
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super(HwmonInstrument, self).__init__(target)
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self.logger.debug('Discovering available HWMON sensors...')
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for ts in self.target.hwmon.sensors:
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try:
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ts.get_file('input')
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measure = self.measure_map.get(ts.kind)[0]
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if measure:
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self.logger.debug('\tAdding sensor {}'.format(ts.name))
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self.add_channel(_guess_site(ts), measure, sensor=ts)
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else:
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self.logger.debug('\tSkipping sensor {} (unknown kind "{}")'.format(ts.name, ts.kind))
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except ValueError:
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message = 'Skipping sensor {} because it does not have an input file'
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self.logger.debug(message.format(ts.name))
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continue
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def take_measurement(self):
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result = []
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for chan in self.active_channels:
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convert = self.measure_map[chan.sensor.kind][1]
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value = convert(chan.sensor.get('input'))
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result.append(Measurement(value, chan))
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return result
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def _guess_site(sensor):
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"""
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HWMON does not specify a standard for labeling its sensors, or for
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device/item split (the implication is that each hwmon device a separate chip
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with possibly several sensors on it, but not everyone adheres to that, e.g.,
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with some mobile devices splitting a chip's sensors across multiple hwmon
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devices. This function processes name/label of the senors to attempt to
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identify the best "candidate" for the site to which the sensor belongs.
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"""
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if sensor.name == sensor.label:
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# If no label has been specified for the sensor (in which case, it
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# defaults to the sensor's name), assume that the "site" of the sensor
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# is identified by the HWMON device
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text = sensor.device.name
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else:
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# If a label has been specified, assume multiple sensors controlled by
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# the same device and the label identifies the site.
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text = sensor.label
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# strip out sensor kind suffix, if any, as that does not indicate a site
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for kind in ['volt', 'in', 'curr', 'power', 'energy',
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'temp', 'voltage', 'temperature', 'current']:
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if kind in text.lower():
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regex = re.compile(r'_*{}\d*_*'.format(kind), re.I)
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text = regex.sub('', text)
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return text.strip()
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