Re: Re: Re: Re: How to access vendor specificAC97codecregister?

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

>> 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.
> Google for "linux ucb touchscreen driver"
> Also look in drivers/mfd/
OK, I have: drivers/mfd/ucb1x00*.* I will look at those. Thx

>> > 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.
>>
> I'm afraid it's not a simple as that (only register 0x54 can work this
> way - see pxa manual on AC97 slot 12). You still have to check and clear
> the command and status done bits in GSR. You will also have to manage
> access with the audio driver as only one read/write can take place at a
> time over the AC97 link. I'm not sure how your going to use your mmap
> vm_ops to do all this.
I'm not sure either. If pxa2xx_ac97_read() can do it (remenber /proc/...regs 
where all registers are listed?), why applying same strategy in a user code 
would fail ? At that point I will just cobble some code and let it try. As 
far interference with existing ALSA it may be tricky. I will find out a hard 
way, I'm afraid. Will keep you posted. Thx.





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