On Sat, 18 Apr 2015, Marc Ludwig <Brotbuechsenleasing@xxxxxx> wrote: > Hi, Folks! > > I'am looking for an opportunity to access the I2C-Interface which is attached > to my displayport link. > Can anyone give me a hint aubout an minimal working example for this? > > I tried to figure aut how this could be solved using the linux userspace, but > for me it looks like i have to implement my own driver > according to https://www.kernel.org/doc/htmldocs/drm/ch02s05.html#idp10812112 > this should be done by describing an > drm_dp_aux_msg structure, which is passed into a driver's .transfer > implementation. You may be conflating two things here. DP has a native AUX channel, and I2C-over-AUX on top. If it's DDC you're after, you want I2C, and the I2C adapters are exposed to userspace. You might want to have a look at ddccontrol [1]. It's not minimal and seems to be abandoned, but last time I tried I could use it to control my monitor. If it's DP AUX you're after (why?) there was some discussion about adding such an interface in the thread starting at [2]. BR, Jani. [1] http://ddccontrol.sourceforge.net/ [2] http://mid.gmane.org/1428493301-20293-1-git-send-email-durgadoss.r@xxxxxxxxx > Furthermore i was looking into some packages (the working machine runs an > ArchLinux-Distro) which where provided. > $ extra/libdrm 2.4.60-2 :Userspace interface to kernel DRM services > $ extra/libva-intel-driver 1.5.1-1 : VA-API implementation for Intel G45 and HD > Graphics family (the working machine has an Intel HD4000 GPU) > But none of them does provide such helper functions. > > Thank you for your time, with kind Regards, > > > Marc > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
