Subject: Re: SMBus implementation
To: Jared D.McNeill <firstname.lastname@example.org>
From: Jason Thorpe <email@example.com>
Date: 10/26/2005 21:53:07
On Oct 25, 2005, at 4:07 PM, Jared D. McNeill wrote:
> So I was bored, and decided to whip up some SMBus support code.
> would be great.
"Try again." :-)
This needs to be done within the context of sys/dev/i2c (which
already has support for doing smbus operations with "regular" I2C
interfaces). If it doesn't integrate with the existing I2C
framework, it's a non-starter.
There should not be /dev/smb* device nodes, IMO.
> What's there:
> FreeBSD-compatible /dev/smb* devices.
> Support for the VIA VT8235 SMBus controller (on PCI-ISA bridge).
> What's not:
> No ability to attach hw drivers to the smbus device.
> Maybe tie it in a bit tighter with the i2c stuff?
> If you're feeling dangerous, the code is available here:
> To use (to -current);
> 1. Apply the patch, untar archive into source tree.
> 2. Add the following to your kernel config:
> viapcib* at pci? dev ? function ?
> smbus* at viapcib?
> 3. Create devices:
> cd /usr/src/etc
> make MAKEDEV
> cp MAKEDEV /dev
> cd /dev
> sh MAKEDEV smb
> 4. Install the smbus headers:
> cd /usr/src/sys/dev/smbus
> make includes
> 5. Grab 'smbmsg' from the FreeBSD source tree. It should compile as-
> 6. Start poking around.
> I'll hold off on committing this for a while until it's better tested,
> and I hear some feedback telling me where I've gone wrong :)