On Tue, Aug 9, 2011 at 3:47 PM, Peter Hutterer <[email protected]>wrote:
> On Mon, Aug 08, 2011 at 04:55:36PM +1000, Peter Hutterer wrote: > > On Fri, Aug 05, 2011 at 09:29:41PM +1200, Jason alavaliant wrote: > > > I've just finished rewriting a lot of the wacom-config ( > > > http://wacom-config.sourceforge.net/) code to directly access the > xinput > > > properties of wacom devices rather than using xsetwacom. The only > thing > > > I've got left at this point that I don't think I'm doing the ideal way > is > > > getting the version of the wacom driver. (I'm currently reading > > > /var/log/Xorg.0.log and using a regex to find the first version line > after > > > the line showing the load of wacom_drv.so) > > > > > > What is the recommended method for application authors to find the > driver > > > version on the system? > > > > Provided you have the wacom devel pkgs installed, > > pkg-config --modversion xorg-wacom > > will tell you the version at compile/configure-time. That's probably the > > best for an application that really requires wacom but it has the > drawback > > that you need the wacom devel header installed at configure time and > > (in the case of a distribution) if the driver is updated, the application > > may lag behind. > Not really ideal for my use since I can't guarantee a user of wacom-config will have installed dev packages. > > > > Assuming that xsetwacom is always the one from the driver package, > xsetwacom > > --version should tell you the correct version. > That's handy, I wasn't aware that output matched the driver version. I think I was thinking of linuxwacom<https://sourceforge.net/apps/mediawiki/linuxwacom/index.php?title=Linuxwacom>rather than input-wacom (which as I recall had it's own version number for xsetwacom) That looks to be my best option so for besides the log file. > > > But really, we don't have a useful version export mainly because it > wasn't > > really needed so far, the other drivers don't change enough that it > matters > > whether you're running x.y or x.y+1. Suggestions appreciated, I've been > > thinking of adding a modversion property for a while now anyway. > To me the easiest place to export the driver version would be to add another device parameter like the existing 'Wacom Serial IDs' which contained the driver version? > > Now I remembered why I started and discarded previous attempts at this: > The main issue with getting the driver version is that it does not > accommodate for backported patches. Upstream version x.y may have a > required > new feature (or bugfix) but if a distribution backports those patches > without bumping the version, your client may reduce functionality. e.g. > the > wacom driver in RHEL6 is quite different to 0.10.5, even though > that is the version it would report. Distributions can work around that at > build-time but a client shouldn't do any run-time driver version detection. > > Thus, it is usually better to focus on the feature you need and determine > how to find out if that feature is available or not rather than relying on > a single version. > > Fair enough, I was trying to avoid dealing with version numbers myself but there is one thing I couldn't think of a way to work out without using driver versions. http://linuxwacom.git.sourceforge.net/git/gitweb.cgi?p=linuxwacom/xf86-input-wacom;a=commit;h=e0354b9fde1e489bd0c87aa7f34b827ce3e27778 (xsetwacom: add PROP_FLAG_INVERTED for Hover Click/TPCButton) How would one detect if 'Wacom Hover Click' is turned on or off by setting 1/0 except by checking the driver version since the behavior changes between versions but the property name stays the same? Thanks -J
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