115 lines
4.4 KiB
Python
115 lines
4.4 KiB
Python
# osmo_gsm_tester: class defining a Power Supply object
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#
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# Copyright (C) 2018 by sysmocom - s.f.m.c. GmbH
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#
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# Author: Pau Espin Pedrol <pespin@sysmocom.de>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from ..core import log
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from ..core.event_loop import MainLoop
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from .powersupply import PowerSupply
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class PowerSupplySispm(PowerSupply):
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"""PowerSupply implementation using pysispm.
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The device object from sismpm is not cached into an attribute of the class
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instance because it is actually a libusb object keeping the device assigned
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to it until it destroyed, meaning it will block other users to use the whole
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device until the object is released. Instead, we pick the object in the
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smallest scope possible, and we re-try if we receive a "Resource Busy" error
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because we know it will be available in short time.
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"""
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def _retry_usberr(self, func, *args):
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"""Run function until it runs successfully, retry on spurious errors.
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Sometimes when operating the usb device, libusb reports the following spurious exception:
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[Errno 16] Resource busy -> This can appear if another instance is using the device.
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[Errno 110] Operation timed out
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Retrying after that it's usually enough.
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"""
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while True:
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try:
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ret = func(*args)
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return ret
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except USBError as e:
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if e.errno == 16 or e.errno==110:
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self.log('skip usb error, retry', repr(e))
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MainLoop.sleep(self, 0.1)
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continue
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raise e
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def _get_device(self):
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"""Get the sispm device object.
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It should be kept alive as short as possible as it blocks other users
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from using the device until the object is released.
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"""
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mydevid = self.conf.get('device')
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devices = self._retry_usberr(sispm.connect)
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for d in devices:
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did = self._retry_usberr(sispm.getid, d)
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self.dbg('detected device:', did)
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if did == mydevid:
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self.dbg('found matching device: %s' % did)
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return d
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return None
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########################
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# PUBLIC - INTERNAL API
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########################
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def __init__(self, conf):
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super().__init__(conf, 'sispm')
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import sispm
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from usb.core import USBError
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mydevid = conf.get('device')
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if mydevid is None:
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raise log.Error('No "device" attribute provided in supply conf!')
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self.set_name('sispm-'+mydevid)
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myport = conf.get('port')
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if myport is None:
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raise log.Error('No "port" attribute provided in power_supply conf!')
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if not int(myport):
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raise log.Error('Wrong non numeric "port" attribute provided in power_supply conf!')
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self.set_name('sispm-'+mydevid+'-'+myport)
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self.port = int(myport)
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device = self._get_device()
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if device is None:
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raise log.Error('device with with id %s not found!' % mydevid)
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dmin = self._retry_usberr(sispm.getminport, device)
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dmax = self._retry_usberr(sispm.getmaxport, device)
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if dmin > self.port or dmax < self.port:
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raise log.Error('Out of range "port" attribute provided in power_supply conf!')
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def is_powered(self):
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"""Get whether the device is powered on or off."""
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return self._retry_usberr(sispm.getstatus, self._get_device(), self.port)
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def power_set(self, onoff):
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"""Turn on (onoff=True) or off (onoff=False) the device."""
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if onoff:
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self.dbg('switchon')
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self._retry_usberr(sispm.switchon, self._get_device(), self.port)
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else:
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self.dbg('switchoff')
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self._retry_usberr(sispm.switchoff, self._get_device(), self.port)
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# vim: expandtab tabstop=4 shiftwidth=4
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