linux-kernel - Re: [PATCH v4 1/2] staging: iio: ad7780: update voltage on read

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Date:   Fri, 16 Nov 2018 18:27:33 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "kernel-usp@...glegroups.com" <kernel-usp@...glegroups.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "renatogeh@...il.com" <renatogeh@...il.com>,
        "giuliano.belinassi@....br" <giuliano.belinassi@....br>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v4 1/2] staging: iio: ad7780: update voltage on read

On Mon, 12 Nov 2018 07:57:24 +0000
"Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:

> On Sun, 2018-11-11 at 14:30 +0000, Jonathan Cameron wrote:
> > On Tue, 6 Nov 2018 09:24:44 +0000
> > "Ardelean, Alexandru" <alexandru.Ardelean@...log.com> wrote:
> >   
> > > On Mon, 2018-11-05 at 17:14 -0200, Renato Lui Geh wrote:  
> > > > The ad7780 driver previously did not read the correct device output,
> > > > as
> > > > it read an outdated value set at initialization. It now updates its
> > > > voltage on read.
> > > >     
> > 
> > Applied to the togreg branch of iio.git and pushed out as testing for
> > the autobuilders to check it.  I'm not that fussed about pushing this
> > one as a fix, as most of the time these things are on fixed regulators
> > anyway, but it is nice to do it right.
> >   
> > > Looks good from my side.  
> > 
> > Ack?  
> 
> Acked-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Added to both in this series.

Thanks,

Jonathan

> 
> > 
> > Much preferred if you are willing to give a formal acknowledgement.
> > 
> > Thanks,
> > 
> > Jonathan
> > 
> >   
> > > 
> > > Alex
> > >   
> > > > Signed-off-by: Renato Lui Geh <renatogeh@...il.com>
> > > > ---
> > > > Changes in v3:
> > > > 	- removed initialization (int voltage_uv = 0)
> > > > 	- returns error when voltage_uv is null
> > > > Changes in v4:
> > > > 	- returns error when voltage_uv is negative
> > > > 
> > > >  drivers/staging/iio/adc/ad7780.c | 6 +++++-
> > > >  1 file changed, 5 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/staging/iio/adc/ad7780.c
> > > > b/drivers/staging/iio/adc/ad7780.c
> > > > index b67412db0318..c7cb05cedbbc 100644
> > > > --- a/drivers/staging/iio/adc/ad7780.c
> > > > +++ b/drivers/staging/iio/adc/ad7780.c
> > > > @@ -87,12 +87,16 @@ static int ad7780_read_raw(struct iio_dev
> > > > *indio_dev,
> > > >  			   long m)
> > > >  {
> > > >  	struct ad7780_state *st = iio_priv(indio_dev);
> > > > +	int voltage_uv;
> > > >  
> > > >  	switch (m) {
> > > >  	case IIO_CHAN_INFO_RAW:
> > > >  		return ad_sigma_delta_single_conversion(indio_dev, chan,
> > > > val);
> > > >  	case IIO_CHAN_INFO_SCALE:
> > > > -		*val = st->int_vref_mv * st->gain;
> > > > +		voltage_uv = regulator_get_voltage(st->reg);
> > > > +		if (voltage_uv < 0)
> > > > +			return voltage_uv;
> > > > +		*val = (voltage_uv / 1000) * st->gain;
> > > >  		*val2 = chan->scan_type.realbits - 1;
> > > >  		return IIO_VAL_FRACTIONAL_LOG2;
> > > >  	case IIO_CHAN_INFO_OFFSET:    
> > 
> >