From mboxrd@z Thu Jan 1 00:00:00 1970 From: "alasinski" Subject: Re: Re: Re: How to access vendor specific AC97codecregister? Date: Thu, 20 Apr 2006 13:40:25 -0400 Message-ID: References: <1145546855.3008.0.camel@mindpipe> <1145549628.25762.4.camel@localhost.localdomain> <1145552273.25762.22.camel@localhost.localdomain> Return-path: Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Liam Girdwood wrote: >> > You will only be able to access these functions from an ad-hoc AC97 >> > driver. Please see the UCB14xx touch driver for implementation details. >> - where I can find it ? > > Please use Google. Your Google must be better then mine. But I don't give up, I'm still looking. For sure UCB14xx leads nowhere. Little hint could go long way. >> How to go about using sysfs() to access to registers ? It provides info >> on >> file system equivalent to /proc/filesystems content I'm told. I know of >> one >> way to do it: I can map registers into user space with >> open("/dev/mem",...) >> followed by mmap (...). Then I'm a king and can read/write to any of >> them. > > This wont work for AC97 codec registers as they are not part of the host > memory map and are accessed via the hosts AC97 controller. It should. What I intended to do is make same calls as pxa2xx_ac97_read. It talks to memory mapped AC97 codec registers to obtain content of UCB1400 registers. They appear to be mapped 1 to 1 with gsr_bit toggled as a handshake protocol. Is sysfs() going to be more helpfull ? cheers -al ------------------------------------------------------- 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