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// battery
// Copyright (C) 2016-2017 Karol 'Kenji Takahashi' Woźniak
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// +build freebsd dragonfly
package battery
import (
"errors"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
func readUint32(bytes []byte) uint32 {
var ret uint32
for i, b := range bytes {
ret |= uint32(b) << uint(i*8)
}
return ret
}
func uint32ToFloat64(num uint32) (float64, error) {
if num == 0xffffffff {
return 0, errors.New("Unknown value received")
}
return float64(num), nil
}
func ioctl_(fd int, nr int64, retptr *[164]byte) error {
return ioctl(fd, nr, 'B', unsafe.Sizeof(*retptr), unsafe.Pointer(retptr))
}
func systemGet(idx int) (*Battery, error) {
fd, err := unix.Open("/dev/acpi", unix.O_RDONLY, 0777)
if err != nil {
return nil, err
}
defer unix.Close(fd)
b := &Battery{}
e := ErrPartial{}
// No unions in Go, so lets "emulate" union with byte array ;-].
var retptr [164]byte
unit := (*int)(unsafe.Pointer(&retptr[0]))
*unit = idx
err = ioctl_(fd, 0x10, &retptr) // ACPIIO_BATT_GET_BIF
if err != nil {
return nil, err
}
mw := readUint32(retptr[0:4]) == 0 // acpi_bif.units
b.Design, e.Design = uint32ToFloat64(readUint32(retptr[4:8])) // acpi_bif.dcap
b.Full, e.Full = uint32ToFloat64(readUint32(retptr[8:12])) // acpi_bif.lfcap
b.DesignVoltage, e.DesignVoltage = uint32ToFloat64(readUint32(retptr[16:20])) // acpi_bif.dvol
b.DesignVoltage /= 1000
*unit = idx
err = ioctl_(fd, 0x11, &retptr) // APCIIO_BATT_GET_BST
if err == nil {
switch readUint32(retptr[0:4]) { // acpi_bst.state
case 0x0000:
b.State = Full
case 0x0001:
b.State = Discharging
case 0x0002:
b.State = Charging
case 0x0004:
b.State = Empty
default:
b.State = Unknown
}
b.ChargeRate, e.ChargeRate = uint32ToFloat64(readUint32(retptr[4:8])) // acpi_bst.rate
b.Current, e.Current = uint32ToFloat64(readUint32(retptr[8:12])) // acpi_bst.cap
b.Voltage, e.Voltage = uint32ToFloat64(readUint32(retptr[12:16])) // acpi_bst.volt
b.Voltage /= 1000
} else {
e.State = err
e.ChargeRate = err
e.Current = err
e.Voltage = err
}
if e.DesignVoltage != nil && e.Voltage == nil {
b.DesignVoltage, e.DesignVoltage = b.Voltage, nil
}
if !mw {
if e.DesignVoltage == nil {
b.Design *= b.DesignVoltage
} else {
e.Design = e.DesignVoltage
}
if e.Voltage == nil {
b.Full *= b.Voltage
b.ChargeRate *= b.Voltage
b.Current *= b.Voltage
} else {
e.Full = e.Voltage
e.ChargeRate = e.Voltage
e.Current = e.Voltage
}
}
return b, e
}
// There is no way to iterate over available batteries.
// Therefore we assume here that if we were not able to retrieve
// anything, it means we're done.
func systemGetAll() ([]*Battery, error) {
var batteries []*Battery
var errors Errors
for i := 0; ; i++ {
b, err := systemGet(i)
if perr, ok := err.(ErrPartial); ok && perr.noNil() {
break
}
if errno, ok := err.(syscall.Errno); ok && errno == 6 {
break
}
batteries = append(batteries, b)
errors = append(errors, err)
}
return batteries, errors
}
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