On Thu, 2007-02-01 at 15:22 +0100, Manuel Lauss wrote: > Hi Liam, > > On Thu, Feb 01, 2007 at 02:07:20PM +0000, Liam Girdwood wrote: > > On Thu, 2007-02-01 at 14:32 +0100, Manuel Lauss wrote: > > > Hello, > > > > > > Is it possible for the ALSA AC97 layer to support > > > a AC97 touchscreen (such as the Wolfson 97xx series > > > or the ucb1400) in a generic way? I.e. can I access > > > certain registers in the codec from a "platform" driver > > > which uses the ac97 bus instead of the platform bus? > > > (Is there something like a "struct ac97_driver" which > > > works like the "struct platform_driver"? ) > > > > I can only comment on the wm97xx drivers here as I'm the author. > > > > The wm97xx touch driver is pretty much arch independent and uses the > > ac97 bus device for access to the codec. Alsa audio works as normal. > > > > Fwiw, wm9705, wm9712 and wm9713 drivers are here :- > > > > http://opensource.wolfsonmicro.com/~lg/wm97xx/ > > > > I assume your trying to read back an AUX adc or similar for some board > > specific purpose. In this case I've added an wm97xx bus device that can > > grant access to codec IO and other misc common functions (and can be > > used from your platform driver). However, it's not truly generic as it > > does require the wm97xx core. > > Does this also work with your SoC layer (which is very nice, btw)? It does. :) > (My targets are Au1200 and some SuperH SoCs) > We unfortunately don't have support for either SoC yet. A platform driver (DMA and AC97) would need to be implemented before audio/touch would work. > I looked through the alsa code a bit, can I not use the > snd_ac97_write/read() functions to read the ADC registers of > the codec once the ac97 bus has been created? It may work, although I've never tried. You will need to make sure that the AC97 link is running first otherwise all IO will fail (ac97 codec driver does this for you). Liam ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
