On 07/08/14 17:36, Felipe Balbi wrote:
> Hi,
>
> On Thu, Aug 07, 2014 at 05:27:56PM +0100, Jonathan Cameron wrote:
>>>>>>> + + if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) + return -EBUSY; + + if (chan->type != IIO_LIGHT)
>>>>>>> + return -EINVAL; + + mutex_lock(&opt->lock); + + switch (mask) {
>>>>>>
>>>>>> is there no way to control the scale?
>>>>>
>>>>> yeah, but the HW does auto-scaling which works pretty well. Why would you want to control the scale manually ?
>>>> On a slow device like this you probably wouldn't but for quicker devices the overhead of converting into a
>>>> standard form in kernel might be excessive.
>>>
>>> hehe, even when you _do_ set the scale, you still have the top 4
>>> bits as exponent, the difference is that you know what they are
>>> before the conversion is done :-)
>> Then you can junk them and let userspace use the known value to deal
>> with the raw data.
>
> alright, I'll leave that to a future patch then. Auto-ranging is so much
> simpler.
>
Agreed - it's just unusual for it to actually be present on the device.
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