linux-kernel - Re: [PATCH v3 2/3] Staging: iio: adt7316: Move interrupt related code

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Message-ID: <043e51316f5acf9004d11ecb77a5485d3fe41494.camel@gmail.com>
Date:   Sat, 08 Dec 2018 22:14:13 +0530
From:   Shreeya Patel <shreeya.patel23498@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
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
Subject: Re: [PATCH v3 2/3] Staging: iio: adt7316: Move interrupt related
 code

On Sat, 2018-12-08 at 16:12 +0000, Jonathan Cameron wrote:
> On Sat,  8 Dec 2018 20:46:37 +0530
> Shreeya Patel <shreeya.patel23498@...il.com> wrote:
> 
> > There is a function adt7316_irq_setup() where irq_type is being
> > set. It would be good to move devm_request_threaded_irq() function
> > and assignment of chip->config1 in adt7316_irq_setup() to unclutter
> > the code in probe function.
> > 
> > Signed-off-by: Shreeya Patel <shreeya.patel23498@...il.com>
> 
> As commented below, this didn't end up as tidy as it might have been.
> It would I think have been simpler before patch 1 or just merged with
> it.
> 
As I was introducing a new function named "adt7316_setup_irq" so I
thought patch 1 should come first because we are setting up the
irq_type there.
But yes, this made the code complex to review.

I didn't merge both patches because both the patches were having
different changes. If I would have done that then there was a
possibility where someone would have said to split the patches.

> Anyhow, I might combine the two whilst applying. However before I do
> that I'd like to leave this on list for a few days to let Alex
> or others have time for another look before I apply it.
> 

It's ok, I'll merge both patches and send as a v4 to you. I'll send it
after 3-4 days so we can get other reviews by that time if there are
any to come.

My vacation has started so I'll work faster now.

> All heading in the right direction!
> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  drivers/staging/iio/addac/adt7316.c | 34 ++++++++++++++-----------
> > ----
> >  1 file changed, 17 insertions(+), 17 deletions(-)
> > 
> > diff --git a/drivers/staging/iio/addac/adt7316.c
> > b/drivers/staging/iio/addac/adt7316.c
> > index 86b2c3d53588..97dd48153293 100644
> > --- a/drivers/staging/iio/addac/adt7316.c
> > +++ b/drivers/staging/iio/addac/adt7316.c
> > @@ -1807,11 +1807,12 @@ static irqreturn_t
> > adt7316_event_handler(int irq, void *private)
> >  	return IRQ_HANDLED;
> >  }
> >  
> > -static int adt7316_setup_irq(struct device *dev, int irq)
> > +static int adt7316_setup_irq(struct iio_dev *indio_dev)
> 
> Hmm. This has ended up a lot more complex than ideal due
> to the effective two layers of rework.  
> 
> I would either have done patches 1 and 2 as one patch or
> reordered them so the rework preceded the change
> to DT.  It's not that important but it would have lead
> to code that was easier to review.
> 
> 
> >  {
> > -	int irq_type;
> > +	struct adt7316_chip_info *chip = iio_priv(indio_dev);
> > +	int irq_type, ret;
> >  
> > -	irq_type = irqd_get_trigger_type(irq_get_irq_data(irq));
> > +	irq_type = irqd_get_trigger_type(irq_get_irq_data(chip-
> > >bus.irq));
> >  
> >  	switch (irq_type) {
> >  	case IRQF_TRIGGER_HIGH:
> > @@ -1821,13 +1822,23 @@ static int adt7316_setup_irq(struct device
> > *dev, int irq)
> >  	case IRQF_TRIGGER_FALLING:
> >  		break;
> >  	default:
> > -		dev_info(dev, "mode %d unsupported, using
> > IRQF_TRIGGER_LOW\n",
> > +		dev_info(&indio_dev->dev, "mode %d unsupported,
> > using IRQF_TRIGGER_LOW\n",
> >  			 irq_type);
> >  		irq_type = IRQF_TRIGGER_LOW;
> >  		break;
> >  	}
> >  
> > -	return irq_type;
> > +	ret = devm_request_threaded_irq(&indio_dev->dev, chip-
> > >bus.irq,
> > +					NULL,
> > adt7316_event_handler,
> > +					irq_type | IRQF_ONESHOT,
> > +					indio_dev->name,
> > indio_dev);
> > +	if (ret)
> > +		return ret;
> > +
> > +	if (irq_type & IRQF_TRIGGER_HIGH)
> > +		chip->config1 |= ADT7316_INT_POLARITY;
> > +
> > +	return ret;
> >  }
> >  
> >  /*
> > @@ -2124,7 +2135,6 @@ int adt7316_probe(struct device *dev, struct
> > adt7316_bus *bus,
> >  {
> >  	struct adt7316_chip_info *chip;
> >  	struct iio_dev *indio_dev;
> > -	int irq_type;
> >  	int ret = 0;
> >  
> >  	indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
> > @@ -2168,19 +2178,9 @@ int adt7316_probe(struct device *dev, struct
> > adt7316_bus *bus,
> >  	indio_dev->modes = INDIO_DIRECT_MODE;
> >  
> >  	if (chip->bus.irq > 0) {
> > -		irq_type = adt7316_setup_irq(dev, chip->bus.irq);
> > -
> > -		ret = devm_request_threaded_irq(dev, chip-
> > >bus.irq,
> > -						NULL,
> > -						adt7316_event_hand
> > ler,
> > -						irq_type |
> > IRQF_ONESHOT,
> > -						indio_dev->name,
> > -						indio_dev);
> > +		ret = adt7316_setup_irq(indio_dev);
> >  		if (ret)
> >  			return ret;
> > -
> > -		if (irq_type & IRQF_TRIGGER_HIGH)
> > -			chip->config1 |= ADT7316_INT_POLARITY;
> >  	}
> >  
> >  	ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1,
> > chip->config1);
> 
>