Re: [PATCH] ACPI / platform: add IDs for Broadcom Bluetooth and GPS chips

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

Hi,

On Thu, May 15, 2014 at 09:50:45AM +0200, Rolf Eike Beer wrote:
> Heikki Krogerus wrote:
> > > the AzureWave AW-AH691A module looks similar to me, it is identified as
> > > AAM4752. However if I add it to that list I don't get anything, even with
> > > the brcmfmac driver loaded. Is there any magic missing?
> > 
> > Which machine are you using? Could you attach the output of acpidump?
> 
> this is an Aava Inari 8 tablet (pre-release hardware). To avoid spamming the 
> list with the same DSDT twice, please have a look at my reply in the thread 
> "Re: [Patch V2 0/9] I2C ACPI operation region handler support".

Okay. So the AAM4752 is a GPS module attached to the UART. You need
to add the HID to the list in drivers/acpi/acpi_platform.c and also to
the driver, which is net/rfkill/rfkill-gpio.c in this case.

But that will only give you a rfkill switch that allows you to
control the enable signal of the chip via rfkill framework. The actual
communication with the chip happens from userspace via /dev/ttySx
(/dev/ttyS2 on your board), just like with any other peripheral
attached to UARTs. So no drivers needed for that.


Br,

-- 
heikki