Re: [PATCH] i2c/busses: Driver for Devantech USB-ISS I2C adapter

[Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>]

On Tue, Mar 22, 2011 at 11:07:46PM -0700, Guenter Roeck wrote:
> On Wed, Mar 23, 2011 at 01:41:53AM -0400, Bernhard Walle wrote:
> > * Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org> [2011-03-23 05:50]:
> > > 
> > > It should, you can talk to the device from userspace using that virtual
> > > serial port, right?  Isn't that what you need to do here?
> > > 
> > > Why try to create a new type of interface to the device from what it was
> > > supposed to be by the manufacturer?
> > 
> > The device is multi-function. It's quite common to use some (extended)
> > USB-to-serial-converters also for serial busses like I²C or SPI. I know
> > that from the FT2232C chip.
> > 
> > Using such a device as normal Linux I²C device makes perfectly sense,
> > IMO.
> > 
> Correct. I use and need it as I2C bus controller. FWIW, that is what it is sold
> for. User space access doesn't help me there.
> 
> Anyway, the only reason for submitting the driver was that I thought it might
> be useful for others. Maybe not useful enough, and defintely not worth arguing
> about it. I'll make it available as stand-alone driver; that should be good enough.

No need for that, we want drivers in the kernel tree.

But, if this just duplicates the cdc-acm interface, and it looks like it
does, I don't think you need a kernel driver at all for it.  Just use
userspace commands to the serial port, like you do on Windows, and all
should be fine, right?

thanks,

greg k-h
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