Re: [RFC/PATCH] iio: light: add support for TI's opt3001 ligth sensor

[Jonathan Cameron <jic23@kernel.org>]

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On 06/08/14 23:38, Felipe Balbi wrote:
> On Thu, Aug 07, 2014 at 12:35:11AM +0200, Peter Meerwald wrote:
>> 
>>>>> ok... but then that brings up a doubt. What would I use triggered buffer for ? I already setup High/Low
>>>>> limits (thresholds) through .write_event_value(). Isn't that, pretty much, a triggered buffer ?
>>>> 
>>>> a triggered buffer reads data from the device and stores it into a buffer whenever the trigger goes off (you
>>>> are interested to capture all samples)
>>> 
>>> Alright, so something like a contious capture starting after a GPIO goes off, or something ?
>> 
>> right, one capture whenever the GPIO becomes active typically
Or if I am conjecturing correctly on what the hystersis mode here does, it
would be applicable for that.  The interrupts indicating a change would provide
the iio_trigger and that would result in the buffer being filled.

This allows you to poll/select on the data arriving.
The BMC100 driver currently under review does something very similar with
a motion detector interrupt so that data is only captured if significant
motion is going on.

>> 
>>>> events are created on certain conditions (you are not interested in all samples)
>>> 
>>> And this would be more like e.g. "tell me once I have 100 lux or more" ?
>> 
>> yes
> 
> cool thanks. I'll wait for some more review comments before sending a new version. Latest is kept at [1]
> 
> [1] https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/log/?h=opt3001
> 
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