From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 6 Aug 2014 17:30:45 -0500
From: Felipe Balbi <balbi@ti.com>
To: Peter Meerwald <pmeerw@pmeerw.net>
CC: Felipe Balbi <balbi@ti.com>, <jic23@kernel.org>,
        <linux-iio@vger.kernel.org>
Subject: Re: [RFC/PATCH] iio: light: add support for TI's opt3001 ligth sensor
Message-ID: <20140806223045.GF3556@saruman.home>
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Hi,

On Thu, Aug 07, 2014 at 12:25:59AM +0200, Peter Meerwald wrote:
> > > > > > +		.scan_type =3D {
> > > > > > +			.sign =3D 'u',
> > > > >=20
> > > > > .realbits / .storagebits missing?
> > > >=20
> > > > yeah, couldn't figure this out. The HW gives me a 16-bit value where
> > > > 12-bits are the mantissa and 4-bits are for the exponent. Should I =
call
> > > > realbits 16 and storagebits 32 ?
> > >=20
> > > so .realbits =3D 16 and .storagebits =3D 16, but there is no way to d=
escribe=20
> > > the mantissa/exponent thing to userspace
> > >=20
> > > you are not using iio_triggered_buffer_setup() yet, so no need for=20
> > > .scan_type (yet)
> >=20
> > 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 ?
>=20
> a triggered buffer reads data from the device and stores it into a buffer=
=20
> 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 ?

> events are created on certain conditions (you are not interested in all=
=20
> samples)

And this would be more like e.g. "tell me once I have 100 lux or more" ?

--=20
balbi

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