[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: ptcd(4), a driver for the cash drawer port on the PROTECH PS3100 point of sale terminal
- To: Marc Balmer <marc%msys.ch@localhost>
- Subject: Re: ptcd(4), a driver for the cash drawer port on the PROTECH PS3100 point of sale terminal
- From: Thor Lancelot Simon <tls%panix.com@localhost>
- Date: Sun, 16 Dec 2012 10:56:53 -0500
On Sun, Dec 16, 2012 at 11:53:54AM +0100, Marc Balmer wrote:
> Am 15.12.2012 um 23:05 schrieb Iain Hibbert <plunky%ogmig.net@localhost>:
> > I wonder, since there is no way to detect this device, and the driver
> > seems to be entirely a wrapper for the inb/outb functions, is there not a
> > way to access the inb/outb from userland directly (with an ioctl or sysctl
> > maybe) and then control of such things as this could be done directly with
> > a simple-script and not require a custom kernel?
> That could probably be possible. But the driver is not only a wrapper to
> inb(), outb() (which I replaced by proper bus_space_read/write calls, btw),
> but provides a GPIO device so that teh hardware can be accessed from
> userland. gpio(4) seems a logical choice for such devices.
It might be possible, but it would also require running the system with
the 4.4BSD security model disabled. Not a good idea.
Thor Lancelot Simon
It's very complicated. It's very cumbersome. There's a
lot of numbers involved with it.
Main Index |
Thread Index |