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4d0c5762ad
Add ASL files for the Chrome OS EC, taken from coreboot. Signed-off-by: Simon Glass <sjg@chromium.org>
56 lines
1.4 KiB
Text
56 lines
1.4 KiB
Text
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2014 Google Inc.
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*/
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Device (ALS)
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{
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Name (_HID, "ACPI0008")
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Name (_UID, 1)
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Method (_STA, 0, NotSerialized)
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{
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Return (0xF)
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}
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/*
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* Returns the current ambient light illuminance reading in lux
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*
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* 0: Reading is below the range of sensitivity of the sensor
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* -1: Reading is above the range or sensitivity of the sensor
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*/
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Method (_ALI, 0, NotSerialized)
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{
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Return (^^ALS0)
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}
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/*
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* Returns a recommended polling frequency in tenths of seconds
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*
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* 0: No need to poll, async notifications will indicate changes
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*/
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Name (_ALP, 10)
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/*
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* Returns a package of packages where each tuple consists of a pair
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* of integers mapping ambient light illuminance to display brightness.
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*
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* {<display luminance adjustment>, <ambient light illuminance>}
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*
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* Ambient light illuminance values are specified in lux.
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*
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* Display luminance adjustment values are relative percentages where
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* 100 is no (0%) display brightness adjustment. Values <100 indicate
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* negative adjustment (dimming) and values >100 indicate positive
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* adjustment (brightening).
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*
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* This is currently unused by the Linux kernel ACPI ALS driver but
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* is required by the ACPI specification so just define a basic two
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* point response curve.
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*/
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Name (_ALR, Package ()
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{
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Package () { 70, 30 }, // Min { -30% adjust at 30 lux }
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Package () { 150, 1000 } // Max { +50% adjust at 1000 lux }
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})
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}
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