linux-kernel - Re: [PATCH v1 09/15] iio: adc: ad7768-1: Move buffer allocation to a separate function

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Message-ID: <20250112124056.4c933181@jic23-huawei>
Date: Sun, 12 Jan 2025 12:40:56 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Jonathan Santos <Jonathan.Santos@...log.com>
Cc: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, Sergiu Cuciurean
 <sergiu.cuciurean@...log.com>, <lars@...afoo.de>,
 <Michael.Hennerich@...log.com>, <robh@...nel.org>, <krzk+dt@...nel.org>,
 <conor+dt@...nel.org>, <marcelo.schmitt1@...il.com>
Subject: Re: [PATCH v1 09/15] iio: adc: ad7768-1: Move buffer allocation to
 a separate function

On Tue, 7 Jan 2025 12:26:05 -0300
Jonathan Santos <Jonathan.Santos@...log.com> wrote:

> From: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
> 
> This change moves the buffer allocation in a separate function, making
> space for adding another type of iio buffer if needed.
> 
> Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
> ---
>  drivers/iio/adc/ad7768-1.c | 64 ++++++++++++++++++++++----------------
>  1 file changed, 37 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
> index cd1b08053105..eaa9a12737ac 100644
> --- a/drivers/iio/adc/ad7768-1.c
> +++ b/drivers/iio/adc/ad7768-1.c
> @@ -163,6 +163,7 @@ struct ad7768_state {
>  	struct iio_trigger *trig;
>  	struct gpio_desc *gpio_sync_in;
>  	struct gpio_desc *gpio_reset;
> +	int irq;
>  	const char *labels[ARRAY_SIZE(ad7768_channels)];
>  	/*
>  	 * DMA (thus cache coherency maintenance) may require the
> @@ -569,6 +570,40 @@ static int ad7768_set_channel_label(struct iio_dev *indio_dev,
>  	return 0;
>  }
>  
> +static int ad7768_triggered_buffer_alloc(struct iio_dev *indio_dev)
> +{
> +	struct ad7768_state *st = iio_priv(indio_dev);
> +	int ret;
> +
> +	st->trig = devm_iio_trigger_alloc(indio_dev->dev.parent, "%s-dev%d",
> +					  indio_dev->name,
> +					  iio_device_id(indio_dev));
> +	if (!st->trig)
> +		return -ENOMEM;
> +
> +	st->trig->ops = &ad7768_trigger_ops;
> +	iio_trigger_set_drvdata(st->trig, indio_dev);
> +	ret = devm_iio_trigger_register(indio_dev->dev.parent, st->trig);
> +	if (ret)
> +		return ret;
> +
> +	indio_dev->trig = iio_trigger_get(st->trig);
> +
> +	init_completion(&st->completion);
> +
> +	ret = devm_request_irq(indio_dev->dev.parent, st->irq,
> +			       &ad7768_interrupt,
> +			       IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> +			       indio_dev->name, indio_dev);
> +	if (ret)

As with the completion, the interrupt is not just for triggered buffer use
either, so probably doesn't belong in this function.  Again, not
a bug to do so, but hurts readability a little.

> +		return ret;
> +
> +	return devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev,
> +					       &iio_pollfunc_store_time,
> +					       &ad7768_trigger_handler,
> +					       &ad7768_buffer_ops);
> +}
> +
>  static int ad7768_probe(struct spi_device *spi)
>  {
>  	struct ad7768_state *st;
> @@ -610,6 +645,7 @@ static int ad7768_probe(struct spi_device *spi)
>  		return PTR_ERR(st->mclk);
>  
>  	st->mclk_freq = clk_get_rate(st->mclk);
> +	st->irq = spi->irq;
>  
>  	mutex_init(&st->lock);
>  
> @@ -625,37 +661,11 @@ static int ad7768_probe(struct spi_device *spi)
>  		return ret;
>  	}
>  
> -	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",
> -					  indio_dev->name,
> -					  iio_device_id(indio_dev));
> -	if (!st->trig)
> -		return -ENOMEM;
> -
> -	st->trig->ops = &ad7768_trigger_ops;
> -	iio_trigger_set_drvdata(st->trig, indio_dev);
> -	ret = devm_iio_trigger_register(&spi->dev, st->trig);
> -	if (ret)
> -		return ret;
> -
> -	indio_dev->trig = iio_trigger_get(st->trig);
> -
> -	init_completion(&st->completion);
> -
>  	ret = ad7768_set_channel_label(indio_dev, ARRAY_SIZE(ad7768_channels));
>  	if (ret)
>  		return ret;
>  
> -	ret = devm_request_irq(&spi->dev, spi->irq,
> -			       &ad7768_interrupt,
> -			       IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> -			       indio_dev->name, indio_dev);
> -	if (ret)
> -		return ret;
> -
> -	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
> -					      &iio_pollfunc_store_time,
> -					      &ad7768_trigger_handler,
> -					      &ad7768_buffer_ops);
> +	ret = ad7768_triggered_buffer_alloc(indio_dev);
>  	if (ret)
>  		return ret;
>