linux-kernel - GPIO-Ports on VIA EPIA-SN

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Date:	Mon, 09 Jun 2008 20:00:05 +0200
From:	Stefan Hellermann <stefan@...2masters.de>
To:	linux-kernel@...r.kernel.org, David Brownell <david-b@...bell.net>,
	David Brownell <david-b@...bell.net>
Subject: GPIO-Ports on VIA EPIA-SN

Hello,

I have a VIA Epia-SN embedded-board with 8 GPIO-connectors. I got the
attached documentation from VIA after I asked how to use the
GPIO-connectors with Linux.
The GPIO is connected to the VT8251 southbridge, here is lspci-output:

# lspci -vv -s 00:11.0
00:11.0 ISA bridge: VIA Technologies, Inc. VT8251 PCI to ISA Bridge
	Subsystem: VIA Technologies, Inc. VT8251 PCI to ISA Bridge
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Capabilities: [c0] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-

Can anybody help me writing a small kernel-driver for this? I heard of
the GPIO-framework, but I have no clue where to start with. I simply
want to switch these ports to 0 or 1 :).

I don't know under what license this documentation is, I simply got
these 6 pages with sample source code.

Kind Regards
Stefan Hellermann

Download attachment "SN_Digital_IO_Operating Guide_021908 .pdf" of type "application/pdf" (61219 bytes)