Hi Jerome,
It seems this BCM4324(1) rev B5 chipset is not initialized from a
Bluetooth point of view, while working great for Wi-Fi.
I suppose this combo chip uses SDIO bus for WiFi and UART for Bluetooth.
If so, you need to attach the correct UART port to the hci_uart line
discipline from user-space.
I've seen recent patches adding support for some devices simply by
adding their respective ACPI ID in hci_bcm.c (BCM2E7C for MacBook
2015, BCM2E65 for the Asus T100TAF, BCM2E54 for the HP Omni 10) so
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).
Neither of these 2 IDs (BCM2E3C, BCM2E55) is listed in hci_bcm.c. It's
just a guess at this stage but could one of these be the missing
element required in hci_bcm.c to initialize Bluetooth on the Lenovo
ThinkPad 8 Tablet maybe? I don't know if the following commands might
give a hint to filter between the two IDs:
$ cat /sys/bus/acpi/devices/BCM2E3C\:00/status
0
$ cat /sys/bus/acpi/devices/BCM2E55\:00/status
15
Check in your acpi table if one of them matches a bluetooth node.
Then, try to add it in the acpi device id list in hci_bcm.c.
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.
Now, you can run btattach (bluez tool):
$ btattach -B /dev/ttySX -P bcm
And check that hci0 has been created
$ hciconfig
Regards,
Loic
--
Intel Open Source Technology Center
http://oss.intel.com/
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