battery 0.7.8

Cross-platform information about the notebook batteries
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

use std::convert::AsRef;
use std::fmt;

use super::ffi::{BatteryQueryInformation, DeviceHandle};
use crate::platform::traits::BatteryDevice;
use crate::units::{ElectricPotential, Energy, Power, ThermodynamicTemperature};
use crate::{Error, Result, State, Technology};

#[derive(Default)]
pub struct PowerDevice {
    // Used later for information refreshing
    tag: BatteryQueryInformation,

    technology: Technology,
    state: State,
    voltage: ElectricPotential,
    energy_rate: Power,
    capacity: Energy,
    design_capacity: Energy,
    full_charged_capacity: Energy,
    temperature: Option<ThermodynamicTemperature>,
    cycle_count: Option<u32>,
    device_name: Option<String>,
    manufacturer: Option<String>,
    serial_number: Option<String>,
}

impl PowerDevice {
    pub fn try_from(mut handle: DeviceHandle) -> Result<Option<PowerDevice>> {
        let info = handle.information()?;
        if info.is_relative() {
            // We can't support batteries with relative data so far
            return Ok(None);
        }

        let device_name = match handle.device_name() {
            Ok(name) => Some(name),
            Err(_) => None,
        };
        let manufacturer = match handle.manufacture_name() {
            Ok(name) => Some(name),
            Err(_) => None,
        };
        let serial_number = match handle.serial_number() {
            Ok(value) => Some(value),
            Err(_) => None,
        };

        let mut device = PowerDevice {
            tag: handle.tag.clone(),
            technology: info.technology(),
            device_name,
            manufacturer,
            serial_number,
            ..Default::default()
        };
        device.refresh(handle)?;
        Ok(Some(device))
    }

    pub fn refresh(&mut self, mut handle: DeviceHandle) -> Result<()> {
        let info = handle.information()?;

        let status = handle.status()?;
        let rate = match status.rate() {
            // Battery neither charging nor discharging, energy rate is set to zero
            None => watt!(0.0),
            Some(value) => milliwatt!(value),
        };
        let capacity = match status.capacity() {
            None => return Err(Error::invalid_data("Device capacity value is unknown")),
            Some(value) => milliwatt_hour!(value),
        };
        let voltage = match status.voltage() {
            None => return Err(Error::invalid_data("Device voltage value is unknown")),
            Some(value) => millivolt!(value),
        };
        let temperature = match handle.temperature() {
            Ok(value) => Some(decikelvin!(value)),
            Err(_) => None,
        };

        self.state = status.state();
        self.energy_rate = rate;
        self.design_capacity = milliwatt_hour!(info.designed_capacity());
        self.full_charged_capacity = milliwatt_hour!(info.full_charged_capacity());
        self.cycle_count = info.cycle_count();
        self.capacity = capacity;
        self.voltage = voltage;
        self.temperature = temperature;

        Ok(())
    }

    pub fn tag(&self) -> &BatteryQueryInformation {
        &self.tag
    }
}

impl BatteryDevice for PowerDevice {
    fn energy(&self) -> Energy {
        self.capacity
    }

    fn energy_full(&self) -> Energy {
        self.full_charged_capacity
    }

    fn energy_full_design(&self) -> Energy {
        self.design_capacity
    }

    fn energy_rate(&self) -> Power {
        self.energy_rate
    }

    fn state(&self) -> State {
        self.state
    }

    fn voltage(&self) -> ElectricPotential {
        self.voltage
    }

    fn temperature(&self) -> Option<ThermodynamicTemperature> {
        self.temperature
    }

    fn vendor(&self) -> Option<&str> {
        self.manufacturer.as_ref().map(AsRef::as_ref)
    }

    fn model(&self) -> Option<&str> {
        self.device_name.as_ref().map(AsRef::as_ref)
    }

    fn serial_number(&self) -> Option<&str> {
        self.serial_number.as_ref().map(AsRef::as_ref)
    }

    fn technology(&self) -> Technology {
        self.technology
    }

    fn cycle_count(&self) -> Option<u32> {
        self.cycle_count
    }
}

impl fmt::Debug for PowerDevice {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("WindowsDevice")
            .field("tag", &self.tag.battery_tag())
            .finish()
    }
}