Using i2c from UEFI driver or application

Using i2c from UEFI driver or application

[Rebecca Cran]

I'm writing an application (it may also end up being a DXE driver) that 
needs to access the i2c bus. The issue I'm seeing is that the i2c/SMBus 
access protocols etc. seem to be from the PI spec, and my understanding 
is that drivers or applications aren't supposed to use PI-specific 
functionality.  Is my understanding correct, or is there some other way 
for drivers/applications to access i2c devices?

-- 
Rebecca

Re: Using i2c from UEFI driver or application

[Kinney, Michael D]

Rebecca,

PI conformant drivers can use PI spec Protocols/PPIs such as I2C.

A UEFI Driver or UEFI Application can use PI Protocols, but the 
UEFI Driver/App must look for the PI Protocol and fail gracefully,
provide reduced functionality, or provide an alternate implementation
of the feature if the PI Protocol is not found.

Thanks,

Mike


> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Rebecca
> Cran
> Sent: Wednesday, April 12, 2017 12:44 PM
> To: edk2-devel@lists.01.org
> Subject: [edk2] Using i2c from UEFI driver or application
> 
> I'm writing an application (it may also end up being a DXE driver) that
> needs to access the i2c bus. The issue I'm seeing is that the i2c/SMBus
> access protocols etc. seem to be from the PI spec, and my understanding
> is that drivers or applications aren't supposed to use PI-specific
> functionality.  Is my understanding correct, or is there some other way
> for drivers/applications to access i2c devices?
> 
> --
> Rebecca
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