diff options
Diffstat (limited to 'src/ec/smsc/mec1308/acpi/battery.asl')
| -rw-r--r-- | src/ec/smsc/mec1308/acpi/battery.asl | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/ec/smsc/mec1308/acpi/battery.asl b/src/ec/smsc/mec1308/acpi/battery.asl new file mode 100644 index 0000000000..9b2f93be53 --- /dev/null +++ b/src/ec/smsc/mec1308/acpi/battery.asl @@ -0,0 +1,196 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2011 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +/* + * 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, One) + + // Method to enable full battery workaround + Method (BFWE) + { + Store (One, BFWK) + } + + // Method to disable full battery workaround + Method (BFWD) + { + Store (Zero, BFWK) + } + + // Swap bytes in a word + Method (SWAB, 1, NotSerialized) + { + ShiftRight (Arg0, 8, Local0) + ShiftLeft (Arg0, 8, Local1) + And (Local1, 0xFF00, Local1) + Or (Local0, Local1, Local0) + If (LEqual (Local0, 0xFFFF)) { + Store (0xFFFFFFFF, Local0) + } + Return (Local0) + } + + Method (_STA, 0, Serialized) + { + If (BTEX) { + Return (0x1F) + } Else { + Return (0x0F) + } + } + + Method (_BIF, 0, Serialized) + { + // Update fields from EC + Store (SWAB (BTDA), Index (PBIF, 1)) + Store (SWAB (BTDF), Index (PBIF, 2)) + Store (SWAB (BTDV), Index (PBIF, 4)) + Store (SWAB (BTDL), Index (PBIF, 6)) + + // Get battery info from mainboard + Store (\BATM, Index (PBIF, 9)) + Store (\BATS, Index (PBIF, 10)) + Store (\BATV, Index (PBIF, 12)) + + 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 (BTST, Local0) + Store (Zero, Local1) + + // Check if AC is present + If (ACEX) { + // Set only charging/discharging bits + And (Local0, 0x03, Local1) + } Else { + // Always discharging when on battery power + Store (0x01, Local1) + } + + // Flag if the battery level is critical + And (Local0, 0x04, Local4) + Or (Local1, Local4, Local1) + Store (Local1, Index (PBST, 0)) + + // Notify if battery state has changed since last time + If (LNotEqual (Local1, BSTP)) { + Store (Local1, BSTP) + Notify (BAT0, 0x80) + } + + // + // 1: BATTERY PRESENT RATE + // + + Store (SWAB (BTPR), Local1) + If (LAnd (LNotEqual (Local1, 0xFFFFFFFF), + LGreaterEqual (Local1, 0x8000))) { + Xor (Local1, 0xFFFF, Local1) + Increment (Local1) + } + Store (Local1, Index (PBST, 1)) + + // + // 2: BATTERY REMAINING CAPACITY + // + Store (SWAB (BTRA), Local1) + If (LAnd (LNotEqual (Local1, 0xFFFFFFFF), + LGreaterEqual (Local1, 0x8000))) { + Xor (Local1, 0xFFFF, Local1) + Increment (Local1) + } + + If (LAnd (BFWK, LAnd (ACEX, 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 (SWAB (BTDF), 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 (SWAB (BTVO), Index (PBST, 3)) + + Return (PBST) + } +} |