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# Copyright 2015 ARM Limited
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import re
from collections import defaultdict
from devlib.module import Module
from devlib.utils.types import integer
HWMON_ROOT = '/sys/class/hwmon'
HWMON_FILE_REGEX = re.compile(r'(?P<kind>\w+?)(?P<number>\d+)_(?P<item>\w+)')
class HwmonSensor(object):
def __init__(self, device, path, kind, number):
self.device = device
self.path = path
self.kind = kind
self.number = number
self.target = self.device.target
self.name = '{}/{}{}'.format(self.device.name, self.kind, self.number)
self.label = self.name
self.items = set()
def add(self, item):
self.items.add(item)
if item == 'label':
self.label = self.get('label')
def get(self, item):
path = self.get_file(item)
value = self.target.read_value(path)
try:
return integer(value)
except (TypeError, ValueError):
return value
def set(self, item, value):
path = self.get_file(item)
self.target.write_value(path, value)
def get_file(self, item):
if item not in self.items:
raise ValueError('item "{}" does not exist for {}'.format(item, self.name))
filename = '{}{}_{}'.format(self.kind, self.number, item)
return self.target.path.join(self.path, filename)
def __str__(self):
if self.name != self.label:
text = 'HS({}, {})'.format(self.name, self.label)
else:
text = 'HS({})'.format(self.name)
return text
__repr__ = __str__
class HwmonDevice(object):
@property
def sensors(self):
all_sensors = []
for sensors_of_kind in self._sensors.itervalues():
all_sensors.extend(sensors_of_kind.values())
return all_sensors
def __init__(self, target, path):
self.target = target
self.path = path
self.name = self.target.read_value(self.target.path.join(self.path, 'name'))
self._sensors = defaultdict(dict)
path = self.path
if not path.endswith(self.target.path.sep):
path += self.target.path.sep
for entry in self.target.list_directory(path,
as_root=self.target.is_rooted):
match = HWMON_FILE_REGEX.search(entry)
if match:
kind = match.group('kind')
number = int(match.group('number'))
item = match.group('item')
if number not in self._sensors[kind]:
sensor = HwmonSensor(self, self.path, kind, number)
self._sensors[kind][number] = sensor
self._sensors[kind][number].add(item)
def get(self, kind, number=None):
if number is None:
return [s for _, s in sorted(self._sensors[kind].iteritems(),
key=lambda x: x[0])]
else:
return self._sensors[kind].get(number)
def __str__(self):
return 'HD({})'.format(self.name)
__repr__ = __str__
class HwmonModule(Module):
name = 'hwmon'
@staticmethod
def probe(target):
return target.file_exists(HWMON_ROOT)
@property
def sensors(self):
all_sensors = []
for device in self.devices:
all_sensors.extend(device.sensors)
return all_sensors
def __init__(self, target):
super(HwmonModule, self).__init__(target)
self.root = HWMON_ROOT
self.devices = []
self.scan()
def scan(self):
for entry in self.target.list_directory(self.root,
as_root=self.target.is_rooted):
if entry.startswith('hwmon'):
entry_path = self.target.path.join(self.root, entry)
if self.target.file_exists(self.target.path.join(entry_path, 'name')):
device = HwmonDevice(self.target, entry_path)
self.devices.append(device)
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