Add support for ENE932 EC w/ Compal firmware

Change-Id: I19b03139e7edfee6ff3e0bcef735bb36bfadc354
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2024
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/src/ec/compal/ene932/acpi/battery.asl b/src/ec/compal/ene932/acpi/battery.asl
new file mode 100644
index 0000000000..90d8adbd87
--- /dev/null
+++ b/src/ec/compal/ene932/acpi/battery.asl
@@ -0,0 +1,158 @@
+/*
+ * 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.
+ *
+ * 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
+ */
+
+// Scope (EC0)
+
+Device (BATX)
+{
+	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 (BTNM, Zero)  // Battery number
+
+	// 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)
+	}
+
+	Method (_STA, 0, Serialized)
+	{
+		If (BOL0) {
+			Return (0x1F)
+		} Else {
+			Return (0x0F)
+		}
+	}
+
+	Method (_BIF, 0, Serialized)
+	{
+		// Update fields from EC
+		Store (BAM0, Index (PBIF, 0))
+		Store (BDC0, Index (PBIF, 1))
+		Store (BFC0, Index (PBIF, 2))
+		Store (BDV0, Index (PBIF, 4))
+		Divide(BFC0, 0x64, Local0, Local1)
+		Multiply(Local1, 0x0A, Local1)
+		Store(Local1, Index(PBIF, 5))
+		Divide(BFC0, 0x64, Local0, Local1)
+		Multiply(Local1, 0x03, Local1)
+		Store (Local1, Index (PBIF, 6))
+
+		Store (ToString(BATD), Index (PBIF, 9))  // model
+		Store (ToHexString(BSN0), Index (PBIF, 10))  // serial
+		Store (ToString(BMFN), Index (PBIF, 12))  // venor
+
+		Store(BDN0, BTNM)	// Save the battery number
+
+		Return (PBIF)
+	}
+
+	Method (_BST, 0, Serialized)
+	{
+		//
+		// 0: BATTERY STATE
+		//
+		// bit 0 = discharging
+		// bit 1 = charging
+		// bit 2 = critical level
+		//
+
+		// Get battery state from EC and save it for the charging workaround
+		Store (BST0, Local0)
+		Store (Local0, Index (PBST, 0))
+
+		//
+		// 1: BATTERY PRESENT RATE/CURRENT
+		//
+
+		Store (BAC0, Local1)
+		Subtract(0xFFFF, Local1, Local1)
+		Store (Local1, Index (PBST, 1))
+
+		//
+		// 2: BATTERY REMAINING CAPACITY
+		//
+		Multiply(BFC0, GAU0, Local1)
+		Divide(Local1, 0x64, Local2, 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 (GAU0, 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))
+
+		// Check the Battery Number
+		If(LNotEqual(BDN0, BTNM)) {
+			Notify(BATX, 0x81)
+		}
+
+		Return (PBST)
+	}
+}