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/*
* 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.
*/
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 }
})
}
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