On 05/06, Ardelean, Alexandru wrote:
> On Sat, 2019-05-04 at 13:43 +0300, Alexandru Ardelean wrote:
> > [External]
> >
> >
> > On Sat, May 4, 2019 at 1:25 AM Melissa Wen <melissa.srw@xxxxxxxxx> wrote:
> > >
> > > Use the bitfield macro FIELD_GET, and GENMASK to do the shift and mask
> > > in
> > > one go. This makes the code more readable than explicit masking
> > > followed
> > > by a shift.
> > >
> >
> > This looks neat.
> > I'd have to remember to ack it from my work email.
>
> Acked-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
>
> >
> > One minor comment inline, which would be the object of a new patch.
> >
> > > Signed-off-by: Melissa Wen <melissa.srw@xxxxxxxxx>
> > > ---
> > > drivers/staging/iio/cdc/ad7150.c | 6 +++++-
> > > 1 file changed, 5 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/staging/iio/cdc/ad7150.c
> > > b/drivers/staging/iio/cdc/ad7150.c
> > > index 24601ba7db88..4ba46fb6ac02 100644
> > > --- a/drivers/staging/iio/cdc/ad7150.c
> > > +++ b/drivers/staging/iio/cdc/ad7150.c
> > > @@ -5,6 +5,7 @@
> > > * Copyright 2010-2011 Analog Devices Inc.
> > > */
> > >
> > > +#include <linux/bitfield.h>
> > > #include <linux/interrupt.h>
> > > #include <linux/device.h>
> > > #include <linux/kernel.h>
> > > @@ -44,6 +45,9 @@
> > > #define AD7150_SN0_REG 0x16
> > > #define AD7150_ID_REG 0x17
> > >
> > > +/* AD7150 masks */
> > > +#define AD7150_THRESHTYPE_MSK GENMASK(6, 5)
> > > +
> > > /**
> > > * struct ad7150_chip_info - instance specific chip data
> > > * @client: i2c client for this device
> > > @@ -136,7 +140,7 @@ static int ad7150_read_event_config(struct iio_dev
> > > *indio_dev,
> > > if (ret < 0)
> > > return ret;
> > >
> > > - threshtype = (ret >> 5) & 0x03;
> > > + threshtype = FIELD_GET(AD7150_THRESHTYPE_MSK, ret);
> > > adaptive = !!(ret & 0x80);
> >
> > Why not also do something similar for the `adaptive` value ?
Hi Alexandru,
Yes, I'm working on it! However, taking a look at the driver datasheet (Table
13, page 19), there seems to be a little mistake in choosing the variable name
and its meaning, since when bit(7) is 1 (true) the threshold is fixed, and not
adaptive. For this reason, I removed it from this patchset to mature the
solution. I will send it as a bug fix if I prove it's necessary.
Do you have any advice or feeling about it to share?
P.s.: Sorry for having previously sent an email with HTML.
Melissa
> >
> > >
> > > switch (type) {
> > > --
> > > 2.20.1
> > >
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