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. -----[ Domenico Andreoli, aka cavok --[ http://www.dandreoli.com/gpgkey.asc ---[ 3A0F 2F80 F79C 678A 8936 4FEE 0677 9033 A20E BC50 ------------------------------------------------------------------------------ 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
