linux-kernel - Re: [PATCH v4 2/5] iio: trigger: Add simple trigger

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Message-ID: <20230507153457.3b6bbfed@jic23-huawei>
Date:   Sun, 7 May 2023 15:34:57 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Shreeya Patel <shreeya.patel@...labora.com>,
        Zhigang Shi <Zhigang.Shi@...eon.com>,
        Paul Gazzillo <paul@...zz.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] iio: trigger: Add simple trigger_validation
 helper

On Wed, 3 May 2023 12:48:57 +0300
Matti Vaittinen <mazziesaccount@...il.com> wrote:

> Some triggers can only be attached to the IIO device that corresponds to
> the same physical device. Implement generic helper which can be used as
> a validate_trigger callback for such devices.
> 
> Suggested-by: Jonathan Cameron <jic23@...nel.org>
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> 

Noticed a trivial capitalisation issue inline.

Jonathan

> ---
> Revision history
> v2: => v3:
>  - Fix title (space after iio:)
> v2: New patch
> ---
>  drivers/iio/industrialio-trigger.c | 22 +++++++++++++++++++++-
>  include/linux/iio/trigger.h        |  1 +
>  2 files changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c
> index 784dc1e00310..c616297aa754 100644
> --- a/drivers/iio/industrialio-trigger.c
> +++ b/drivers/iio/industrialio-trigger.c
> @@ -322,7 +322,7 @@ int iio_trigger_attach_poll_func(struct iio_trigger *trig,
>  	 * this is the case if the IIO device and the trigger device share the
>  	 * same parent device.
>  	 */
> -	if (pf->indio_dev->dev.parent == trig->dev.parent)
> +	if (iio_validate_own_trigger(pf->indio_dev, trig))
>  		trig->attached_own_device = true;
>  
>  	return ret;
> @@ -728,6 +728,26 @@ bool iio_trigger_using_own(struct iio_dev *indio_dev)
>  }
>  EXPORT_SYMBOL(iio_trigger_using_own);
>  
> +/**
> + * iio_validate_own_trigger - Check if a trigger and IIO device belong to
> + *  the same device
> + * @idev: the IIO device to check
> + * @trig: The IIO trigger to check

The / the consistency needs fixing. I'm not sure on the local / file convention, but
it hopefully isn't a random mixture!

> + *
> + * This function can be used as the validate_trigger callback for triggers that
> + * can only be attached to their own device.
> + *
> + * Return: 0 if both the trigger and the IIO device belong to the same
> + * device, -EINVAL otherwise.
> + */
> +int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig)
> +{
> +	if (idev->dev.parent != trig->dev.parent)
> +		return -EINVAL;
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(iio_validate_own_trigger);
> +
>  /**
>   * iio_trigger_validate_own_device - Check if a trigger and IIO device belong to
>   *  the same device
> diff --git a/include/linux/iio/trigger.h b/include/linux/iio/trigger.h
> index 51f52c5c6092..bce3b1788199 100644
> --- a/include/linux/iio/trigger.h
> +++ b/include/linux/iio/trigger.h
> @@ -171,6 +171,7 @@ void iio_trigger_free(struct iio_trigger *trig);
>   */
>  bool iio_trigger_using_own(struct iio_dev *indio_dev);
>  
> +int iio_validate_own_trigger(struct iio_dev *idev, struct iio_trigger *trig);
>  int iio_trigger_validate_own_device(struct iio_trigger *trig,
>  				     struct iio_dev *indio_dev);
>