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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011-2012 The Chromium OS Authors. All rights reserved.
*
* 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; version 2 of
* the License.
*
* 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.
*/
/*
* The mainboard must define strings in the root scope to
* report device-specific battery information to the OS.
*
* BATV: Vendor
*/
// Scope (EC0)
Device (BATX)
{
Name (_HID, EISAID ("PNP0C0A"))
Name (_UID, 1)
Name (_PCL, Package () { \_SB })
Name (PBIF, Package () {
0x00000001, // 0 Power Unit: mAh
0xFFFFFFFF, // 1 Design Capacity
0xFFFFFFFF, // 2 Last Full Charge Capacity
0x00000001, // 3 Battery Technology: Rechargeable
0xFFFFFFFF, // 4 Design Voltage
0x000000FA, // 5 Design Capacity of Warning
0x00000096, // 6 Design Capacity of Low
0x0000000A, // 7 Capacity Granularity 1
0x00000019, // 8 Capacity Granularity 2
"", // 9 Model Number
"", // 10 Serial Number
"", // 11 Battery Type
"" // 12 OEM Information
})
Name (PBST, Package () {
0x00000000, // Battery State
0xFFFFFFFF, // Battery Present Rate
0xFFFFFFFF, // Battery Remaining Capacity
0xFFFFFFFF, // Battery Present Voltage
})
// Workaround for full battery status, enabled by default
Name (BFWK, One)
// Method to enable full battery workaround
Method (BFWE)
{
Store (One, BFWK)
}
// Method to disable full battery workaround
Method (BFWD)
{
Store (Zero, BFWK)
}
// Device insertion/removal control method that returns a device's status.
// Power resource object that evaluates to the current on or off state of
// the Power Resource.
Method (_STA, 0, Serialized)
{
If (BTIN) {
Return (0x1F)
} Else {
Return (0x0F)
}
}
Method (_BIF, 0, Serialized)
{
// Update fields from EC
Store (BDC0, Index (PBIF, 1)) // Batt Design Capacity
Store (BFC0, Index (PBIF, 2)) // Batt Last Full Charge Capacity
Store (BDV0, Index (PBIF, 4)) // Batt Design Voltage
Divide(BFC0, 0x64, , Local1)
Multiply(Local1, 0x0A, Local0)
Store(Local0, Index(PBIF, 5))
Multiply(Local1, 0x05, Local0)
Store (Local0, Index (PBIF, 6))
Store (ToString(BATD), Index (PBIF, 9)) // Model Number
Store (ToDecimalString(BSN0), Index (PBIF, 10)) // Serial Number
Store (ToString(BCHM), Index (PBIF, 11)) // Battery Type
Store (\BATV, Index (PBIF, 12)) // OEM information
Return (PBIF)
}
Method (_BST, 0, Serialized)
{
//
// 0: BATTERY STATE
//
// bit 0 = discharging
// bit 1 = charging
// bit 2 = critical level
//
// Get battery state from EC
Store (BST0, Local0)
Store (Local0, Index (PBST, 0))
//
// 1: BATTERY PRESENT RATE/CURRENT
//
Store (BPC0, Local1)
If (LAnd (Local1, 0x8000)) {
Xor (Local1, 0xFFFF, Local1)
Increment (Local1)
}
Store (Local1, Index (PBST, 1))
//
// 2: BATTERY REMAINING CAPACITY
//
Store (BRC0, Local1)
If (LAnd (BFWK, LAnd (ADPT, LNot (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
Store (BFC0, Local2)
// See if within ~3% of full
ShiftRight (Local2, 5, Local3)
If (LAnd (LGreater (Local1, Subtract (Local2, Local3)),
LLess (Local1, Add (Local2, Local3))))
{
Store (Local2, Local1)
}
}
Store (Local1, Index (PBST, 2))
//
// 3: BATTERY PRESENT VOLTAGE
//
Store (BPV0, Index (PBST, 3))
Return (PBST)
}
}
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