linux-kernel - Re: [PATCH 11/16] iio: adc: max1027: Separate the IRQ handler from the read logic

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Message-ID: <20210902105519.5891a90f@xps13>
Date:   Thu, 2 Sep 2021 10:55:19 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "Sa, Nuno" <Nuno.Sa@...log.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 11/16] iio: adc: max1027: Separate the IRQ handler from
 the read logic

Hi Nuno,

"Sa, Nuno" <Nuno.Sa@...log.com> wrote on Fri, 20 Aug 2021 07:23:33
+0000:

> > -----Original Message-----
> > From: Miquel Raynal <miquel.raynal@...tlin.com>
> > Sent: Wednesday, August 18, 2021 1:12 PM
> > To: Jonathan Cameron <jic23@...nel.org>; Lars-Peter Clausen
> > <lars@...afoo.de>
> > Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>; linux-
> > iio@...r.kernel.org; linux-kernel@...r.kernel.org; Miquel Raynal
> > <miquel.raynal@...tlin.com>
> > Subject: [PATCH 11/16] iio: adc: max1027: Separate the IRQ handler
> > from the read logic
> > 
> > [External]
> > 
> > Create a max1027_read_scan() helper which will make clearer the
> > future IRQ
> > handler updates (no functional change).
> > 
> > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > ---
> >  drivers/iio/adc/max1027.c | 27 +++++++++++++++++++++------
> >  1 file changed, 21 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
> > index 83526f3d7d3a..afc3ce69f7ea 100644
> > --- a/drivers/iio/adc/max1027.c
> > +++ b/drivers/iio/adc/max1027.c
> > @@ -427,19 +427,18 @@ static int
> > max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
> >  	return 0;
> >  }
> > 
> > -static irqreturn_t max1027_trigger_handler(int irq, void *private)
> > +static int max1027_read_scan(struct iio_dev *indio_dev)
> >  {
> > -	struct iio_poll_func *pf = private;
> > -	struct iio_dev *indio_dev = pf->indio_dev;
> >  	struct max1027_state *st = iio_priv(indio_dev);
> >  	unsigned int scanned_chans = fls(*indio_dev-  
> > >active_scan_mask);  
> >  	u16 *buf = st->buffer;
> >  	unsigned int bit;
> > -
> > -	pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq,
> > private);
> > +	int ret;
> > 
> >  	/* fill buffer with all channel */
> > -	spi_read(st->spi, st->buffer, scanned_chans * 2);
> > +	ret = spi_read(st->spi, st->buffer, scanned_chans * 2);
> > +	if (ret < 0)
> > +		return ret;
> > 
> >  	/* Only keep the channels selected by the user */
> >  	for_each_set_bit(bit, indio_dev->active_scan_mask,
> > @@ -451,6 +450,22 @@ static irqreturn_t max1027_trigger_handler(int
> > irq, void *private)
> > 
> >  	iio_push_to_buffers(indio_dev, st->buffer);
> > 
> > +	return 0;
> > +}
> > +
> > +static irqreturn_t max1027_trigger_handler(int irq, void *private)
> > +{
> > +	struct iio_poll_func *pf = private;
> > +	struct iio_dev *indio_dev = pf->indio_dev;
> > +	int ret;
> > +
> > +	pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq,
> > private);
> > +  
> 
> This should be more consistent... use 'dev_err()'. I would also
> argue to use the spi dev as the driver state structure holds a
> pointer to it...

I honestly don't see the point of these debug messages (there is
another useless pr_debug in probe). I kept it here as I am just moving
code around without any changes, but if you don't like it (me neither)
I'll add a simple patch dropping them.

Thanks,
Miquèl