diff options
| -rw-r--r-- | src/ec/google/chromeec/acpi/ec.asl | 2 | ||||
| -rw-r--r-- | src/ec/google/chromeec/acpi/keyboard_backlight.asl | 14 |
2 files changed, 16 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/acpi/ec.asl b/src/ec/google/chromeec/acpi/ec.asl index a5324920e6..422abe1881 100644 --- a/src/ec/google/chromeec/acpi/ec.asl +++ b/src/ec/google/chromeec/acpi/ec.asl @@ -54,6 +54,8 @@ Device (EC0) PATC, 8, // Programmable Auxiliary Trip Commit CHGL, 8, // Charger Current Limit TBMD, 1, // Tablet mode + Offset (0x0a), + KBLE, 1, // Keyboard Backlight exists } #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 75a8df3cca..d76bed87ea 100644 --- a/src/ec/google/chromeec/acpi/keyboard_backlight.asl +++ b/src/ec/google/chromeec/acpi/keyboard_backlight.asl @@ -23,6 +23,20 @@ Scope (\_SB) Name (_HID, "GOOG0002") Name (_UID, 1) + /* Ask EC if we even have a backlight + * Return 0xf (present, enabled, show in UI, functioning) or 0 + * + * With older EC codebases that don't support the Device + * Features bitfield, this reports the keyboard backlight as + * enabled since reads to undefined addresses in EC address + * space return 0xff and so KBLE will be 1. + */ + Method (_STA, 0, NotSerialized) + { + Multiply (0xf, \_SB.PCI0.LPCB.EC0.KBLE, Local0) + Return (Local0) + } + /* Read current backlight value */ Method (KBQC, 0, NotSerialized) { |