Re: Broadcom BCM4324(1) rev B5 chipset - Bluetooth support in Linux Kernel 4.x ?

[Loic Poulain <loic.poulain@intel.com>]

Jerome,

>>> I've just taken a look at the data listed by the ACPI subsystem on
>>> this tablet:
>>>
>>>      $ ls /sys/bus/acpi/devices/BCM* -d1
>>>      /sys/bus/acpi/devices/BCM2E3C:00
>>>      /sys/bus/acpi/devices/BCM2E55:00
>>
>> Usually, Broadcom BT controller is described in the ACPI table.
>> You can retrieve your ACPI table at /sys/firmware/acpi/tables/DSDT and
>> decompile it with iasl.
>> You should have a Bluetooth node (BTHX):
>> Device (BTH1)
>>              {
>>                  Name (_HID, "BCM...")
>>
>> With some gpio/irq resources. (0: wakeup, 1: power-, 2:host-wakeup).
>>
>> Check in your acpi table if one of them matches a bluetooth node.
> Both of them are matching a Bluetooth node it seems to me, with BTH0
> and BTH1 entries respectively. I've attached the original DSDT ACPI
> table (dsdt.dat) and the decompiled version (dsdt.dsl). Any useful
> information in there?

from your DSDT:
BTH0 _STA  (status) method returns 0x00 meaning that this device is not 
present.
BTH1 _STA method returns 0x0F meaning that this device is present.

So your BT controller is BTH1 (BCM2E55).

The ACPI table for this BTH1 looks good (1 irq + 2 gpios ) so it should 
be compatible with hci_bcm.

>> Second step is to attach the device, but you need to find the correct tty to
>> use.
>> If your ACPI table is correct, BCM acpi device should appear as a child of a
>> tty device in sysfs.
>> The physical_node symlink in your device directory (sys/bus/acpi...) gives
>> you the hierarchical path.
> Before applying any patches to hci_bcm.c , BCM2E55 has already the
> following hierarchical path:
>
>     /sys/bus/acpi/devices/BCM2E55:00$ ls -l physical_node
>     lrwxrwxrwx 1 root root 0 févr. 28 21:45 physical_node ->
> ../../../../platform/80860F0A:00/BCM2E55:00
80860F0A is the UART controller (8250_dw), looks good.
So you should also find BCM2E55 id into:
/sys/class/ttyS*/device/

> while BCM2E3C has none:
>
>     sys/bus/acpi/devices/BCM2E3C:00$ ls
>     hid  modalias  path  power  status  subsystem  uevent

Yes because BCM2E3C is not enabled.

Regards,
Loic

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