Re: DAC switch between current and voltage mode

[Jonathan Cameron <jic23@kernel.org>]

On 24/08/15 19:44, Lars-Peter Clausen wrote:
> On 08/24/2015 08:44 AM, Sean Nyekjær wrote:
>> Hi Lars-Peter
>>
>> Sorry the write again. Is the possible with the current iio interface to
>> switch a dac from voltage to current mode from userspace?
>> If not, will upstream be interrested in a patch if it's possible?
> 
> Hi,
> 
> Currently this does not work. A patch to add support for this is certainly
> welcome. I'm just not sure what the interface for this should look like.
> Maybe register both a current and a voltage channel and only allow one of
> them to be powered at a time.
That's certainly my initial thought on an interface as well... The only tricky
bit is what a read back of the 'other' channels value should report.  Perhaps
return -EBUSY?

Jonathan
> 
> - Lars
> 
> 
>>
>> Regards
>> Sean Nyekjær
>>
>> On 2015-08-20 11:57, Sean Nyekjær wrote:
>>> Hi all
>>>
>>> I'm in the process of creating a custom BSP with an ad5755 dac. It an
>>> requirement to be able to switch between voltage and current mode per
>>> channel from userspace.
>>> Is it possible with the current iio interface?
>>> Is there a feature in the pipeline where it's possible to do this switch?
>>>
>>> Regards
>>> Sean Nyekjær--
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>>
> 
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