linux-kernel - Re: [v2 04/10] iio: add modifiers for linear acceleration

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Date:   Thu, 28 Oct 2021 11:45:57 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andrea Merello <andrea.merello@...il.com>
Cc:     mchehab+huawei@...nel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        lars@...afoo.de, robh+dt@...nel.org, andy.shevchenko@...il.com,
        matt.ranostay@...sulko.com, ardeleanalex@...il.com,
        jacopo@...ndi.org, Andrea Merello <andrea.merello@....it>
Subject: Re: [v2 04/10] iio: add modifiers for linear acceleration

On Thu, 28 Oct 2021 12:18:34 +0200
Andrea Merello <andrea.merello@...il.com> wrote:

> This patch is preparatory for adding the Bosh BNO055 IMU driver.
> The said IMU can report raw accelerations (among x, y and z axis)
> as well as the so called "linear accelerations" (again, among x,
> y and z axis) which is basically the acceleration after subtracting
> gravity.
> 
> This patch adds IIO_MOD_ACCEL_LINEAR_X, IIO_MOD_ACCEL_LINEAR_Y and
> IIO_MOD_ACCEL_LINEAR_Z modifiers to te IIO core.
> 
> Signed-off-by: Andrea Merello <andrea.merello@....it>

They sometimes get forgotten but we should also update
tools/iio/iio_event_montitor.c to handle these new modifiers.

That can be a separate patch, but also fine to do it in this one.

> ---
>  drivers/iio/industrialio-core.c | 3 +++
>  include/uapi/linux/iio/types.h  | 4 +++-
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 2dbb37e09b8c..a79cb32207e4 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -134,6 +134,9 @@ static const char * const iio_modifier_names[] = {
>  	[IIO_MOD_ETHANOL] = "ethanol",
>  	[IIO_MOD_H2] = "h2",
>  	[IIO_MOD_O2] = "o2",
> +	[IIO_MOD_ACCEL_LINEAR_X] = "linear_x",
> +	[IIO_MOD_ACCEL_LINEAR_Y] = "linear_y",
> +	[IIO_MOD_ACCEL_LINEAR_Z] = "linear_z"
>  };
>  
>  /* relies on pairs of these shared then separate */
> diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
> index 48c13147c0a8..db00f7c45f48 100644
> --- a/include/uapi/linux/iio/types.h
> +++ b/include/uapi/linux/iio/types.h
> @@ -95,6 +95,9 @@ enum iio_modifier {
>  	IIO_MOD_ETHANOL,
>  	IIO_MOD_H2,
>  	IIO_MOD_O2,
> +	IIO_MOD_ACCEL_LINEAR_X,
> +	IIO_MOD_ACCEL_LINEAR_Y,
> +	IIO_MOD_ACCEL_LINEAR_Z,

It might be useful for other channel types, so probably drop the ACCEL
part of the name.

I'll admit I can't immediately think of what, but you never know.. :)

>  };
>  
>  enum iio_event_type {
> @@ -114,4 +117,3 @@ enum iio_event_direction {
>  };
>  
>  #endif /* _UAPI_IIO_TYPES_H_ */
> -
?