linux-kernel - Re: [PATCH 6/6] Staging: iio: adis16209: Use sign

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Date:   Sat, 3 Mar 2018 16:16:33 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Shreeya Patel <shreeya.patel23498@...il.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, daniel.baluta@...il.com
Subject: Re: [PATCH 6/6] Staging: iio: adis16209: Use sign_extend32 and
 adjust a switch statement

On Sat, 03 Mar 2018 21:07:53 +0530
Shreeya Patel <shreeya.patel23498@...il.com> wrote:

> On Sat, 2018-03-03 at 16:05 +0000, Jonathan Cameron wrote:
> > On Fri,  2 Mar 2018 19:04:49 +0530
> > Shreeya Patel <shreeya.patel23498@...il.com> wrote:
> >   
> > > 
> > > Use sign_extend32 function instead of manually coding it.
> > > Also, adjust a switch block to explicitly match channels
> > > and return -EINVAL as default case which makes the code
> > > semantically more clear.
> > > 
> > > Signed-off-by: Shreeya Patel <shreeya.patel23498@...il.com>  
> > Changes are fine, but 2 changes to different things should be
> > in 2 patches.  Please split. I'd probably have taken this anyway if
> > it hadn't been queued behind the requested changes to the previous 2
> > patches anyway.
> > 
> > Good work on this series though so looking forward to v3. 
> > Note please mark the set as [PATCH v3] to make it clear it
> > is the 3rd version of some of this.  
> 
> Yes, I'll do the changes.
> 
> Do I need to include the patches which have been merged from
> this series in v3? 
> 
No, just the ones that haven't merged yet.

Thanks,

Jonathan

> Thanks
> >   
> > > 
> > > ---
> > >  drivers/staging/iio/accel/adis16209.c | 15 ++++++++++-----
> > >  1 file changed, 10 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/staging/iio/accel/adis16209.c
> > > b/drivers/staging/iio/accel/adis16209.c
> > > index 7363fd0..5ab44a4 100644
> > > --- a/drivers/staging/iio/accel/adis16209.c
> > > +++ b/drivers/staging/iio/accel/adis16209.c
> > > @@ -150,10 +150,16 @@ static int adis16209_read_raw(struct iio_dev
> > > *indio_dev,
> > >  		switch (chan->type) {
> > >  		case IIO_VOLTAGE:
> > >  			*val = 0;
> > > -			if (chan->channel == 0)
> > > +			switch (chan->channel) {
> > > +			case 0:
> > >  				*val2 = 305180; /* 0.30518 mV */
> > > -			else
> > > +				break;
> > > +			case 1:
> > >  				*val2 = 610500; /* 0.6105 mV */
> > > +				break;
> > > +			default:
> > > +				return -EINVAL;
> > > +			}
> > >  			return IIO_VAL_INT_PLUS_MICRO;
> > >  		case IIO_TEMP:
> > >  			*val = -470;
> > > @@ -197,9 +203,8 @@ static int adis16209_read_raw(struct iio_dev
> > > *indio_dev,
> > >  		ret = adis_read_reg_16(st, addr, &val16);
> > >  		if (ret)
> > >  			return ret;
> > > -		val16 &= (1 << bits) - 1;
> > > -		val16 = (s16)(val16 << (16 - bits)) >> (16 -
> > > bits);
> > > -		*val = val16;
> > > +
> > > +		*val = sign_extend32(val16, bits - 1);
> > >  		return IIO_VAL_INT;
> > >  	}
> > >  	return -EINVAL;  
> --
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