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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* The mainboard must define strings in the root scope to
* report device-specific battery information to the OS.
*
* BATM: Model
* BATS: Serial
* BATV: Vendor
*/
// Scope (EC0)
Device (BAT0)
{
Name (_HID, EISAID ("PNP0C0A"))
Name (_UID, 1)
Name (_PCL, Package () { \_SB })
Name (PBIF, Package () {
0x00000001, // Power Unit: mAh
0xFFFFFFFF, // Design Capacity
0xFFFFFFFF, // Last Full Charge Capacity
0x00000001, // Battery Technology: Rechargeable
0xFFFFFFFF, // Design Voltage
0x00000003, // Design Capacity of Warning
0xFFFFFFFF, // Design Capacity of Low
0x00000001, // Capacity Granularity 1
0x00000001, // Capacity Granularity 2
"", // Model Number
"", // Serial Number
"LION", // Battery Type
"" // OEM Information
})
Name (PBST, Package () {
0x00000000, // Battery State
0xFFFFFFFF, // Battery Present Rate
0xFFFFFFFF, // Battery Remaining Capacity
0xFFFFFFFF, // Battery Present Voltage
})
Name (BSTP, Zero)
// Workaround for full battery status, enabled by default
Name (BFWK, 1)
// Method to enable full battery workaround
Method (BFWE)
{
BFWK = 1
}
// Method to disable full battery workaround
Method (BFWD)
{
BFWK = Zero
}
// Swap bytes in a word
Method (SWAB, 1, NotSerialized)
{
Local0 = Arg0 >> 8
Local1 = Arg0 << 8
Local1 &= 0xFF00
Local0 |= Local1
If (Local0 == 0xFFFF) {
Local0 = 0xFFFFFFFF
}
Return (Local0)
}
Method (_STA, 0, Serialized)
{
If (BTEX) {
Return (0x1F)
} Else {
Return (0x0F)
}
}
Method (_BIF, 0, Serialized)
{
// Update fields from EC
PBIF[1] = SWAB (BTDA)
PBIF[2] = SWAB (BTDF)
PBIF[4] = SWAB (BTDV)
PBIF[6] = SWAB (BTDL)
// Get battery info from mainboard
PBIF[9] = \BATM
PBIF[10] = \BATS
PBIF[12] = \BATV
Return (PBIF)
}
Method (_BST, 0, Serialized)
{
//
// 0: BATTERY STATE
//
// bit 0 = discharging
// bit 1 = charging
// bit 2 = critical level
//
// Get battery state from EC
Local0 = BTST
Local1 = Zero
// Check if AC is present
If (ACEX) {
// Set only charging/discharging bits
Local1 = Local0 & 3
} Else {
// Always discharging when on battery power
Local1 = 0x01
}
// Flag if the battery level is critical
Local4 = Local0 & 4
Local1 |= Local4
PBST[0] = Local1
// Notify if battery state has changed since last time
If (Local1 != BSTP) {
BSTP = Local1
Notify (BAT0, 0x80)
}
//
// 1: BATTERY PRESENT RATE
//
Local1 = SWAB (BTPR)
If (Local1 != 0xFFFFFFFF && Local1 >= 0x8000) {
Local1 ^= 0xFFFF
Local1++
}
PBST[1] = Local1
//
// 2: BATTERY REMAINING CAPACITY
//
Local1 = SWAB (BTRA)
If (Local1 != 0xFFFFFFFF && Local1 >= 0x8000) {
Local1 ^= 0xFFFF
Local1++
}
If (BFWK && ACEX && !Local0) {
// On AC power and battery is neither charging
// nor discharging. Linux expects a full battery
// to report same capacity as last full charge.
// https://bugzilla.kernel.org/show_bug.cgi?id=12632
Local2 = SWAB (BTDF)
// See if within ~3% of full
Local3 = Local2 >> 5
If (Local1 > Local2 - Local3 && Local1 < Local2 + Local3)
{
Local1 = Local2
}
}
PBST[2] = Local1
//
// 3: BATTERY PRESENT VOLTAGE
//
PBST[3] = SWAB (BTVO)
Return (PBST)
}
}
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