On Tue, 2014-09-09 at 14:27 -0500, Larry Finger wrote:
On 09/09/2014 04:56 AM, Bastien Nocera wrote:
Hey,
I have a tablet that seems to be using Realtek chips to do wireless
communications (hopefully, this time I won't be wrong[1]).
The device, under the gpio class in /sys, shows with a modalias of
"acpi:OBDA8723:" (that's on "O", not "0"). This seems to correspond to a
Realtek chipset (Larry tells me it matches the PCI ID of 0bda:8723 for
the RTL8723AE chipset).
It shows up under:
/sys/devices/platform/80860F0A:00/subsystem/devices
Does anyone have details on how this chipset is actually hooked up? Can
a portion of the existing RTL8723AE driver code be reused?
Bastien,
From the previous response, it seems unlikely that GPIO is used to control the
device. That is what I expected. Working at that primitive level would be
extremely difficult timing.
Right.
I assume that you have checked both 'lspci' and 'lsusb' for any mention of the
wireless device.
No mentions at all in there.
I am not aware of a similar utility to scan an SDIO bus, but
perhaps someone on this list will know.
They would show up under /sys/bus/sdio/devices/ and there's nothing in
there except the SD card reader.
In addition, a full listing of 'lspci
-nnv' will give a clue regarding what adapters are on the device.
Here it is, I doubt that's much help.
00:00.0 Host bridge [0600]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register [8086:0f00] (rev 0d)
Subsystem: Intel Corporation Device [8086:0f31]
Flags: bus master, fast devsel, latency 0
Kernel driver in use: iosf_mbi_pci
Kernel modules: iosf_mbi
00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0d) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31]
Flags: bus master, fast devsel, latency 0, IRQ 106
Memory at a0000000 (32-bit, non-prefetchable) [size=4M]
Memory at 80000000 (32-bit, prefetchable) [size=512M]
I/O ports at 1000 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
00:14.0 USB controller [0c03]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI [8086:0f35] (rev 0d) (prog-if 30 [XHCI])
Subsystem: Intel Corporation Atom Processor Z36xxx/Z37xxx Series USB xHCI [8086:0f35]
Flags: bus master, medium devsel, latency 0, IRQ 104
Memory at a0800000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: xhci_hcd
00:1a.0 Encryption controller [1080]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine [8086:0f18] (rev 0d)
Subsystem: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine [8086:0f18]
Flags: bus master, fast devsel, latency 0, IRQ 107
Memory at a0700000 (32-bit, non-prefetchable) [size=1M]
Memory at a0600000 (32-bit, non-prefetchable) [size=1M]
Capabilities: <access denied>
Kernel driver in use: mei_txe
Kernel modules: mei_txe
00:1f.0 ISA bridge [0601]: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit [8086:0f1c] (rev 0d)
Subsystem: Intel Corporation Atom Processor Z36xxx/Z37xxx Series Power Control Unit [8086:0f1c]
Flags: bus master, medium devsel, latency 0
Capabilities: <access denied>
Kernel driver in use: pmc_atom
Kernel modules: lpc_ich
If the device were used with SDIO, then it would be known as the RTL8723AS. I
could not find that chip, but there is an RTL8723BS with a 32-bit driver for
Windows 8.1.
That sounds like it could be that one then. This is the only info I
have, the (very generic) driver set for Windows (which seems to have
support for every variant) and the DSDT:
https://bugzilla.kernel.org/attachment.cgi?id=149331
The Bluetooth device has a firmware named "rtl8723b_config.bin"
What specific Baytrail tablet do you have?
The Onda v975w. It came with Windows 8.1 32-bit.
I guess that the device is probably a PCI one, but the enumeration is
done through ACPI instead of "normal" PCI.
