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Date:   Thu, 2 Nov 2017 16:04:07 +0100
From:   Wolfram Sang <>
To:     Jonathan Cameron <>
Cc:     Marc CAPDEVILLE <>,
        Kevin Tsai <>,
        Jonathan Cameron <>,
        Peter Meerwald-Stadler <>,
        Hartmut Knaack <>,
        Lars-Peter Clausen <>,,,
        Srinivas Pandruvada <>
Subject: Re: [PATCH v4] iio : Add cm3218 smbus ara and acpi support

On Thu, Nov 02, 2017 at 02:35:50PM +0000, Jonathan Cameron wrote:
> On Fri, 27 Oct 2017 18:27:02 +0200
> Marc CAPDEVILLE <> wrote:
> > On asus T100, Capella cm3218 chip is implemented as ambiant light
> > sensor. This chip expose an smbus ARA protocol device on standard
> > address 0x0c. The chip is not functional before all alerts are
> > acknowledged.
> > On asus T100, this device is enumerated on ACPI bus and the
> > description give tow I2C connection. The first is the connection to
> > the ARA device and the second gives the real address of the device.
> > 
> > So, on device probe,If the i2c address is the ARA address and the
> > device is enumerated via acpi, we lookup for the real address in
> > the ACPI resource list and change it in the client structure.
> > if an interrupt resource is given, and only for cm3218 chip,
> > we declare an smbus_alert device.
> > 
> > Signed-off-by: Marc CAPDEVILLE <>
> Wolfram - this needs input from you on how to neatly handle
> an ACPI registered ARA.

ACPI is really not my field. Try asking the I2C ACPI maintainers or
Benjamin Tissoires <> who did work on SMBus
interrupts recently.

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