linux-kernel - Re: [PATCH v6 3/6] iio: triggered-buffer: extend support to configure output buffers

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Date:   Sun, 10 Oct 2021 17:21:13 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mihail Chindris <mihail.chindris@...log.com>
Cc:     <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>,
        <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        <nuno.sa@...log.com>, <dragos.bogdan@...log.com>,
        <alexandru.ardelean@...log.com>
Subject: Re: [PATCH v6 3/6] iio: triggered-buffer: extend support to
 configure output buffers

On Thu, 7 Oct 2021 08:00:32 +0000
Mihail Chindris <mihail.chindris@...log.com> wrote:

> From: Alexandru Ardelean <alexandru.ardelean@...log.com>
> 
> Now that output (kfifo) buffers are supported, we need to extend the
> {devm_}iio_triggered_buffer_setup_ext() parameter list to take a direction
> parameter.
> 
> This allows us to attach an output triggered buffer to a DAC device.
> Unfortunately it's a bit difficult to add another macro to avoid changing 5
> drivers where {devm_}iio_triggered_buffer_setup_ext() is used.
> Well, it's doable, but may not be worth the trouble vs just updating all
> these 5 drivers.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> Signed-off-by: Mihail Chindris <mihail.chindris@...log.com>
This doesn't build... See inline and fixed whilst applying.
 
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index 28bde13003b7..e9f64da06f89 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -360,8 +360,9 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>  			 * The only way to get samples in buffer is to set a
>  			 * software trigger (systrig, hrtimer).
>  			 */
> -			ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
> -					NULL, trigger_capture, NULL);

This isn't the _ext form...
so dropped this change.
> +			ret = devm_iio_triggered_buffer_setup_ext(dev,
> +					indio_dev, NULL, trigger_capture,
> +					IIO_BUFFER_DIRECTION_IN, NULL);
>  			if (ret)
>  				return ret;
>  		}