diff options
| -rw-r--r-- | src/ec/google/chromeec/acpi/als.asl | 70 | ||||
| -rw-r--r-- | src/ec/google/chromeec/acpi/ec.asl | 4 |
2 files changed, 74 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/acpi/als.asl b/src/ec/google/chromeec/acpi/als.asl new file mode 100644 index 0000000000..8bc68bf1d1 --- /dev/null +++ b/src/ec/google/chromeec/acpi/als.asl @@ -0,0 +1,70 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Google Inc. + * + * 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 + */ + +Device (ALS) +{ + Name (_HID, "ACPI0008") + Name (_UID, 1) + + Method (_STA, 0, NotSerialized) + { + Return (0xF) + } + + /* + * Returns the current ambient light illuminance reading in lux + * + * 0: Reading is below the range of sensitivity of the sensor + * -1: Reading is above the range or sensitivity of the sensor + */ + Method (_ALI, 0, NotSerialized) + { + Return (^^ALS0) + } + + /* + * Returns a recommended polling frequency in tenths of seconds + * + * 0: No need to poll, async notifications will indicate changes + */ + Name (_ALP, 10) + + /* + * Returns a package of packages where each tuple consists of a pair + * of integers mapping ambient light illuminance to display brightness. + * + * {<display luminance adjustment>, <ambient light illuminance>} + * + * Ambient light illuminance values are specified in lux. + * + * Display luminance adjustment values are relative percentages where + * 100 is no (0%) display brightness adjustment. Values <100 indicate + * negative adjustment (dimming) and values >100 indicate positive + * adjustment (brightening). + * + * This is currently unused by the Linux kernel ACPI ALS driver but + * is required by the ACPI specification so just define a basic two + * point response curve. + */ + Name (_ALR, Package () + { + Package () { 70, 30 }, // Min { -30% adjust at 30 lux } + Package () { 150, 1000 } // Max { +50% adjust at 1000 lux } + }) +} diff --git a/src/ec/google/chromeec/acpi/ec.asl b/src/ec/google/chromeec/acpi/ec.asl index 650efd2573..2760f195d0 100644 --- a/src/ec/google/chromeec/acpi/ec.asl +++ b/src/ec/google/chromeec/acpi/ec.asl @@ -431,4 +431,8 @@ Device (EC0) #include "ac.asl" #include "battery.asl" + +#ifdef EC_ENABLE_ALS_DEVICE + #include "als.asl" +#endif } |