On Thu, Feb 11, 2010 at 7:12 AM, Domenico Andreoli <cav...@gmail.com> wrote: > On Wed, Feb 10, 2010 at 11:06 PM, Alex Deucher <alexdeuc...@gmail.com> wrote: >> On Wed, Feb 10, 2010 at 4:13 PM, Domenico Andreoli <ca...@dandreoli.com> >> wrote: >>> On Mon, Feb 08, 2010 at 01:32:33AM -0500, Alex Deucher wrote: >>>> On Sun, Feb 7, 2010 at 6:12 PM, Domenico Andreoli <ca...@dandreoli.com> >>>> wrote: >>>> > Hi all, >>>> > >>>> > I'd like to write a hwmon driver for the Radeon GPUs. I made a quick >>>> > search in the M56 and M76 register references on AMD's site but didn't >>>> > find anything. I then wrote to gpudriverdevsupp...@amd.com and now I'm >>>> > waiting for some response. In the meanwhile, has anybody of you seen >>>> > anything related to this task while working at the graphic drivers? >>>> > >>>> > Supposing I will find the missing info, I see the first problem. I >>>> > guess the hwmon registers are in the address space mapped by the DRM >>>> > driver. Surely I could make a patch but then the radeon's hwmon support >>>> > would depend on the DRM driver. And if one wants the hwmon support >>>> > but doesn't want DRM? Would she need/use a different hwmon driver, >>>> > maybe thank to some Kconfig trick? Any advice? >>>> >>>> The thermal and fan chips are generally 3rd party chips connected via >>>> i2c. I think most of the chips used have hwmon drivers already. You >>>> can look up the chip and i2c address in the power tables in the bios. >>>> See the PowerPlayInfo table definitions in atombios.h. I've started >>>> work on cleaning up the radeon i2c buses for external use in the >>>> drm-radeon-testing branch of Dave's drm tree: >>>> http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=summary >>> >>> I have a question: once the i2c cleaning is completed, every known >>> sensor hooked to it is available to the user-space. Would have any >>> sense that I worked on a hwmon wrapper in the kernel? Which duties >>> would still require the mighty kernel? >> >> You can just load the hwmon driver for the chip in question and >> interface with it via the hwmon API. It would just be hanging off an >> i2c bus on the GPU rather than an i2c bus on the motherboard, > > That's it, nothing special is left to allow the use those i2c sensors from > user space, once you finished the cleanup of radeon's i2c. Indeed > i2cdetect already sees the newly available i2c buses. If I'm wrong > then I am still missing something. Thank you. >
That should be it. Alex ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
