Re: Re: Re: How to access vendor specific AC97codecregister?

["alasinski" <alasinski@rogers.com>]

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 





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