victorenator/als

Asus Zenbook Ambient Light Sensor Driver

ALS (Ambient Light Sensor) Driver

ASUS Zenbook Ambient Light Sensor Driver.

Device /sys/bus/acpi/devices/ACPI0008:00 (ACPI path: _SB.ALS).

Exported attributes:

• ali (Ambient Light Illuminance) (ACPI path: _SB.ALS._ALI)

Asus Zenbook:

• _SB.ALS._HID() // Hardware ID. Return ACPI0008
• _SB.ALS._STA() // Status. Always return 0x0B
• _SB.ALS._DIS() // Disable Device. Empty method, does nothing.
• _SB.ALS._ALI() // Ambient Light Illuminance. Returns one of the following values: 0x32 (min illuminance), 0xC8, 0x190, 0x258, 0x320 (max illuminance).
• _SB.ALS._ALR() // Ambient Light Response. Returns [[0x30, 0x0], [0x30, 0x32], [0x64, 0xC8], [0x7D, 0x0190], [0xA0, 0x0258], [0xD0, 0x0320]].

Note: For enable/disable ALS device, you must call _SB.PCI0.LPCB.EC0.TALS method with 0x1/0x0 integer. For notifications set acpi_osi="Windows 2012".

What methods notify ALS device about changes:

• _SB.ATKD.ALSC (flag) // status changed
• _SB.PCI0.LPCB.EC0.EC0W
• _SB.PCI0.LPCB.EC0._QCD () // illuminance changed
• _SB.PCI0.LPCB.EC0._QDD () // illuminance changed

What methods control ALS device:

• _SB.ATKD.ALSC (flag) // ALS Control
• _SB.PCI0.LPCB.EC0.TALS (flag)

ALS device status:

• _SB.ATKD.GALS () & 0x10 // Get ALs Status

ALS related paths:

• _SB.ALAE // ALS Device Enabled; 0-1
• _SB.LSTP // Light Sensor ? Present; 1
• _SB.ALS.LUXL // LUX Level; 0
• _SB.PCI0.LPCB.EC0 // Embedded Controller ITE IT8572G
• _SB.PCI0.LPCB.EC0.RRAM (0x04C9) // Read RAM; returns 0x0-0xF
• _SB.PCI0.LPCB.EC0.OLUX // Old LUX

Stack:

\_SB.ALS._ALI ()
    ^^PCI0.LPCB.EC0.RALS ()
        if (ALAE) {
            v = RRAM (0x04C9)
            if (v <= 1) return 0x32;
            else if (v <= 0x06) return 0xC8;
            else if (v <= 0x09) return 0x0190;
            else if (v <= 0x0E) return 0x0258;
            else return 0x0320;

        } else return 0xC8

UX31A Notes:

ALS connected to IT8572G via GPI0

als's Issues

Loading module does not create /sys/bus/acpi/devices/ACPI0008:00 with kernel 3.11

Hi,
I've loaded the module, but I can't see /sys/bus/acpi/devices/ACPI0008:00.

If I try to access the module via acpi_call module, it works. Has there anything changed since kernel 3.9?

Issue with Dell XPS 13 (pre 2015)

Hi, after loading the module I see

/sys/bus/acpi/devices/ACPI0008:00

however the directory structure seems to be different by the expected one. It contains:

rwxrwxrwx 1 root root 0 9 ott 12.20 driver -> ../../../../../../../bus/acpi/drivers/acpi_als
-r--r--r-- 1 root root 4096 9 ott 12.22 hid
drwxr-xr-x 5 root root 0 9 ott 12.49 iio:device0
-r--r--r-- 1 root root 4096 9 ott 12.22 modalias
-r--r--r-- 1 root root 4096 9 ott 12.22 path
lrwxrwxrwx 1 root root 0 9 ott 12.49 physical_node -> ../../../../../../pci0000:00/0000:00:1f.0/PNP0C09:00/ACPI0008:00
drwxr-xr-x 2 root root 0 9 ott 12.49 power
-r--r--r-- 1 root root 4096 9 ott 12.22 status
lrwxrwxrwx 1 root root 0 9 ott 12.20 subsystem -> ../../../../../../../bus/acpi
-rw-r--r-- 1 root root 4096 9 ott 12.22 uevent

subfolder "iio:device0" contains "in_illuminance_raw" which seems to give me current raw illuminance value. However gnome 3.18 seems not to detect the sensor and allow automatic display brightness adjustement. I have posted more details here:
http://unix.stackexchange.com/questions/234990/ambient-light-sensor-support-in-gnome-3-18
Can you help me please?