The Kernel knows. But how ? Did the acpi make a secret dead drop ?

[Valentin Vidic]

On Sun, Jan 06, 2019 at 02:22:34PM +0530, Jay Aurabind wrote:
> The subject line might be a bit dramatic, but I assure you my question is
> isn't.
> 
> I have a 3-axis accelerometer (LIS3LV02DL) in my laptop which shows up as
> an input device. Since its x86, I am assuming the necessary information was
> encoded in ACPI Tables. But I cannot find any mention of this device in the
> acpi tables exposed by the kernel.
> 
> I tried grepping through all the ACPI tables in /sys/firmware/acpi/tables.
> I was hoping to find some string that could identify the corresponding
> kernel drivers. But there are no hits for "lis". I suppose string based
> literals are not the way acpi works like in kernel device-driver matching.
> The driver in question is  drivers/misc/lis3lv02d/lis3lv02d.c
> 
> So what exactly in the ACPI triggered the kernel module lis3lv02d to be
> loaded ?

It seems to me this is an I2C device so the following alias could load it:

modules.alias:alias i2c:lis3lv02d lis3lv02d_i2c

-- 
Valentin