Hi Clemens; thankyou for the response. Clemens Ladisch wrote: > John L. Utz III wrote: >> I just tried to find the docs for the CMI8788 on www.cmedia.com.tw and i >> was not successful. > > That website has a datasheet which doesn't contain much of interest. yah, i read that. :-( > There is a datasheet with register specifications, but it is only > available under NDA. > >> Nor have i been able to find any virtuoso docs at www.asus.com. > > The only difference between the CMI8787/CMI8788/AV100/AV200 chips is the > label on top of the chip. Oh, thankyou! >> I know that Clemens wrote the driver, but I dont know if it was written >> from scratch with docs or ported from a 4front driver. > > I started with an ALSA driver that was written by someone at C-Media, > but it was so incomplete and buggy that I started over from scratch. > I never signed an NDA. ok, understood. >> currently, there are some bugs with channel mapping on the rear channel >> in Surround40 mode that i would like to fix > > In 4.0 mode, the "rear" channels go to the "surround" jack. The > "surround" and "back" jacks behave like described in the manual. yup, that works. > The PCM data from the computer is organized as (up to) four two-channel > pairs. There are four DACs that each play a two-channel pair of PCM > data. The "play routing" register contains four two-bit fields that > specify, for each DAC, the number of the channel pair that is to be > played on this DAC. This allows rerouting (by exchanging some fields) > or duplicating of channels pairs (by having the same source for multiple > DACs). All this is handled in the oxygen_update_dac_routing() function. thankyou for the huge fat hint. :-) we have some transposed channels when we run our app, i can probably fix this..... > HTH > Clemens > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
