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# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Mattias Andrée (maandree@kth.se)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import os
class PowerSupply:
'''
Power supply monitor
To calculate the time (in hours) until discharged:
```
power_supply.get_charge() / power_supply.get_current()
```
To calculate the time (in hours) until charged:
```
(power_supply.get_charge_full() - power_supply.get_charge()) / power_supply.get_current()
```
@variable name:str The name of the power supply
@variable path:str The path to the power supply in /sys
@variable type:str? The power supply type, or `None` if not found
(this is most likely not the case), known possible values
'Mains' and 'Battery'
The following will probably be `None` for non-Battery power supplies
@variable manufacturer:str? The manufacturer of the power supply, `None` if unknown
@variable model_name:str? The model name of the power supply, `None` if unknown
@variable serial_number:str? The serial number of the power supply, `None` if unknown
@variable technology:str? The technology the power supply uses, `None` if unknown
@variable charge_full_design:int? The charge (nAh) of the power supply at full capacity
when the power supply supply is 100 % healthy,
`None` if unknown of if not applicable
@variable voltage_min_design:int? The minimum voltage (nV) when the power supply supply is
100 % healthy, `None` if unknown of if not applicable
'''
def __init__(self, name):
'''
Constructor
@param name:str The name of the power supply, you can find
the with `PowerSupply.supplies`
'''
self.name = name
self.path = '/sys/class/power_supply/' + name
self.type = None
if os.path.exists(self.path + '/type'):
with open(self.path + '/type', 'rb') as file:
self.type = file.read().decode('utf-8', 'strict')[:-1]
self.manufacturer = None
if os.path.exists(self.path + '/manufacturer'):
with open(self.path + '/manufacturer', 'rb') as file:
self.manufacturer = file.read().decode('utf-8', 'strict')[:-1]
self.model_name = None
if os.path.exists(self.path + '/model_name'):
with open(self.path + '/model_name', 'rb') as file:
self.model_name = file.read().decode('utf-8', 'strict')[:-1]
self.serial_number = None
if os.path.exists(self.path + '/serial_number'):
with open(self.path + '/serial_number', 'rb') as file:
self.serial_number = file.read().decode('utf-8', 'strict')[:-1]
self.technology = None
if os.path.exists(self.path + '/technology'):
with open(self.path + '/technology', 'rb') as file:
self.technology = file.read().decode('utf-8', 'strict')[:-1]
self.charge_full_design = None
if os.path.exists(self.path + '/charge_full_design'):
with open(self.path + '/charge_full_design', 'rb') as file:
self.charge_full_design = int(file.read().decode('utf-8', 'strict')[:-1])
elif os.path.exists(self.path + '/energy_full_design'):
with open(self.path + '/energy_full_design', 'rb') as file:
self.charge_full_design = int(file.read().decode('utf-8', 'strict')[:-1])
self.voltage_min_design = None
if os.path.exists(self.path + '/voltage_min_design'):
with open(self.path + '/voltage_min_design', 'rb') as file:
self.voltage_min_design = int(file.read().decode('utf-8', 'strict')[:-1])
def get_alarm(self):
'''
Get the alarm level
@return :int? The alarm level, `None` if unknown or if unapplicable
'''
if os.path.exists(self.path + '/alarm'):
with open(self.path + '/alarm', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
return None
def get_capacity(self):
'''
Get the current capacity
This is a rounded down version of `.get_charge() / .get_charge_full()`
@param :int? The current capacity,
`None` if unknown or if unapplicable
'''
if os.path.exists(self.path + '/capacity'):
with open(self.path + '/capacity', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
return None
def get_capacity_level(self):
'''
TODO some information about what this is would be nice
Normal
Full
'''
if os.path.exists(self.path + '/capacity_level'):
with open(self.path + '/capacity_level', 'rb') as file:
return file.read().decode('utf-8', 'strict')[:-1]
return None
def get_charge_full(self):
'''
Get the charge when the power supply is fully charged
according to the last known charge as fully charged state
@return :int? The charge in nAh when the power supply is fully charged,
`None` if unknown or if unapplicable
'''
if os.path.exists(self.path + '/charge_full'):
with open(self.path + '/charge_full', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
if os.path.exists(self.path + '/energy_full'):
with open(self.path + '/energy_full', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
return None
def get_charge(self):
'''
Get the current charge
@return :int? The current charge in nAh,
`None` if unknown or if unapplicable
'''
if os.path.exists(self.path + '/charge_now'):
with open(self.path + '/charge_now', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
if os.path.exists(self.path + '/energy_now'):
with open(self.path + '/energy_now', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
return None
def get_current(self):
'''
Get the current current
@return :int? The current current in nA, `None` if unknown
'''
if os.path.exists(self.path + '/current_now'):
with open(self.path + '/current_now', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
elif os.path.exists(self.path + '/power_now') and os.path.exists(self.path + '/voltage_now'):
with open(self.path + '/power_now', 'rb') as file:
power = int(file.read().decode('utf-8', 'strict')[:-1])
with open(self.path + '/voltage_now', 'rb') as file:
voltage = int(file.read().decode('utf-8', 'strict')[:-1])
return 1000000 * power / voltage
return None
def get_power(self):
'''
Get the current power
@return :int? The current power in nW, `None` if unknown
'''
if os.path.exists(self.path + '/power_now'):
with open(self.path + '/power_now', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
elif os.path.exists(self.path + '/current_now') and os.path.exists(self.path + '/voltage_now'):
with open(self.path + '/current_now', 'rb') as file:
current = int(file.read().decode('utf-8', 'strict')[:-1])
with open(self.path + '/voltage_now', 'rb') as file:
voltage = int(file.read().decode('utf-8', 'strict')[:-1])
return voltage * current / 1000000
return None
def get_cycle_count(self):
'''
Get the battery's cycle count, that is, the full charge
energy divided by the total used energy
@param :int? The number of cycle, is often appear as zero,
`None` if unknown or if unapplicable
'''
if os.path.exists(self.path + '/cycle_count'):
with open(self.path + '/cycle_count', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
return None
def get_status(self):
'''
Get the current status
@return :str? The current status, known values are
'Full', 'Charging', 'Discharging' and 'Unknown',
`None` if unknown or if unapplicable
'''
if os.path.exists(self.path + '/status'):
with open(self.path + '/status', 'rb') as file:
return file.read().decode('utf-8', 'strict')[:-1]
return None
def get_voltage(self):
'''
Get the current voltage
@return :int? The current voltage in nV, `None` if unknown
'''
if os.path.exists(self.path + '/voltage_now'):
with open(self.path + '/voltage_now', 'rb') as file:
return int(file.read().decode('utf-8', 'strict')[:-1])
return None
def is_online(self):
'''
Check whether the power supply is online
@return :bool? Whether the power supply is online, `None` if unknown
'''
if os.path.exists(self.path + '/online'):
with open(self.path + '/online', 'rb') as file:
return file.read().decode('utf-8', 'strict') == '1\n'
if os.path.exists(self.path + '/present'):
with open(self.path + '/present', 'rb') as file:
return file.read().decode('utf-8', 'strict') == '1\n'
return False
@staticmethod
def supplies():
'''
Lists all available power supplies
If the returned list is empty, you are probably running on a
desktop (or more powerful machine such as a server) that only
runs on mains (AC).
@return :list<str> The name of all available power supplies
'''
return os.listdir('/sys/class/power_supply')
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