Change in coreboot[master]: ec/google: Use feature flag layout that matches the EC host command

[Patrick Georgi (Code Review)]

Patrick Georgi has uploaded this change for review. ( https://review.coreboot.org/21193

Change subject: ec/google: Use feature flag layout that matches the EC host command
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ec/google: Use feature flag layout that matches the EC host command

The EC side of the feature bits in ACPI EC space isn't stable yet, and
we're now going for matching them up with the EC host command of the
same purpose.

Change-Id: I9c1f0e5390e840ea0c32315a3da8eea6f3e12f54
Signed-off-by: Patrick Georgi 
---
M src/ec/google/chromeec/acpi/ec.asl
M src/ec/google/chromeec/acpi/keyboard_backlight.asl
2 files changed, 48 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/21193/1

diff --git a/src/ec/google/chromeec/acpi/ec.asl b/src/ec/google/chromeec/acpi/ec.asl
index 422abe1..0d05110 100644
--- a/src/ec/google/chromeec/acpi/ec.asl
+++ b/src/ec/google/chromeec/acpi/ec.asl
@@ -47,15 +47,49 @@
    	RAMV, 8,	// EC RAM Version
    	TSTB, 8,	// Test Byte
    	TSTC, 8,	// Complement of Test Byte
-		KBLV, 8,	// Keyboard Backlight
+		KBLV, 8,	// Keyboard Backlight value
    	FAND, 8,	// Set Fan Duty Cycle
    	PATI, 8,	// Programmable Auxiliary Trip Sensor ID
    	PATT, 8,	// Programmable Auxiliary Trip Threshold
    	PATC, 8,	// Programmable Auxiliary Trip Commit
    	CHGL, 8,	// Charger Current Limit
    	TBMD, 1,	// Tablet mode
+		// DFUD must be 0 for the other 31 values to be valid
    	Offset (0x0a),
-		KBLE, 1,	// Keyboard Backlight exists
+		DFUD, 1,	// Device Features Undefined
+		FLSH, 1,	// Flash commands present
+		PFAN, 1,	// PWM Fan control present
+		KBLE, 1,	// Keyboard Backlight present
+		LTBR, 1,	// Lightbar present
+		LEDC, 1,	// LED control
+		MTNS, 1,	// Motion sensors present
+		KEYB, 1,	// EC is keyboard controller
+		PSTR, 1,	// Persistent storage
+		P80P, 1,	// EC serves I/O Port 80h
+		THRM, 1,	// EC supports thermal management
+		SBKL, 1,	// Screen backlight switch present
+		WIFI, 1,	// WIFI switch present
+		HOST, 1,	// EC monitors host events (eg SCI, SMI)
+		GPIO, 1,	// EC provides GPIO commands
+		I2CB, 1,	// EC provides I2C controller access
+		CHRG, 1,	// EC provides commands for charger control
+		BATT, 1,	// Simply Battery support
+		SBAT, 1,	// Smart Battery support
+		HANG, 1,	// EC can detect host hang
+		PMUI, 1,	// Power Information
+		DSEC, 1,	// another EC exists downstream
+		UPDC, 1,	// supports USB Power Delivery
+		UMUX, 1,	// supports USB Mux
+		MSFF, 1,	// Motion Sense has FIFO
+		TVST, 1,	// supports temporary secure vstore
+		TCMV, 1,	// USB Type C Muxing is virtual (host assisted)
+		RTCD, 1,	// EC provides an RTC device
+		FPRD, 1,	// EC provides a fingerprint reader device
+		TPAD, 1,	// EC provides a touchpad device
+		RWSG, 1,	// EC has RWSIG task enabled
+		DEVE, 1,	// EC supports device events
+		// make sure we're within our space envelope
+		Offset (0x0e),
    }

#if IS_ENABLED(CONFIG_EC_GOOGLE_CHROMEEC_ACPI_MEMMAP)
diff --git a/src/ec/google/chromeec/acpi/keyboard_backlight.asl b/src/ec/google/chromeec/acpi/keyboard_backlight.asl
index d76bed8..1edce81 100644
--- a/src/ec/google/chromeec/acpi/keyboard_backlight.asl
+++ b/src/ec/google/chromeec/acpi/keyboard_backlight.asl
@@ -33,8 +33,18 @@
    	 */
    	Method (_STA, 0, NotSerialized)
    	{
-			Multiply (0xf, _SB.PCI0.LPCB.EC0.KBLE, Local0)
-			Return (Local0)
+			/* If query is unsupported, but this code is compiled
+			 * in, assume the backlight exists physically.
+			 */
+			If (LEqual (1, _SB.PCI0.LPCB.EC0.DFUD)) {
+				Return (0xf)
+			}
+			/* If EC reports that backlight exists, trust it */
+			If (LEqual (1, _SB.PCI0.LPCB.EC0.KBLE)) {
+				Return (0xf)
+			}
+			/* Otherwise: no device -> disable */
+			Return (0)
    	}

/* Read current backlight value */