linux-kernel - Re: [PATCH] Revert "iio: add modifiers for A and B ultraviolet light"

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Date: Tue, 23 Jan 2024 11:51:55 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Paul Cercueil <paul@...pouillou.net>, Jonathan Cameron
 <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>
Cc: Nuno Sa <nuno.sa@...log.com>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "iio: add modifiers for A and B ultraviolet light"

On 23.01.24 11:43, Paul Cercueil wrote:
> This reverts
> b89710bd215e ("iio: add modifiers for A and B ultraviolet light")
> 
> Enum iio_modifer is *ABI*, you can't just decide to change all the
> values from one version to another, otherwise you break userspace.
> The new entries should have been added to the end of the enum.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 7 ++-----
>  drivers/iio/industrialio-core.c         | 2 --
>  include/uapi/linux/iio/types.h          | 2 --
>  tools/iio/iio_event_monitor.c           | 2 --
>  4 files changed, 2 insertions(+), 11 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 2e6d5ebfd3c7..7937bb4a4a68 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1587,8 +1587,6 @@ What:		/sys/.../iio:deviceX/in_intensityY_raw
>  What:		/sys/.../iio:deviceX/in_intensityY_ir_raw
>  What:		/sys/.../iio:deviceX/in_intensityY_both_raw
>  What:		/sys/.../iio:deviceX/in_intensityY_uv_raw
> -What:		/sys/.../iio:deviceX/in_intensityY_uva_raw
> -What:		/sys/.../iio:deviceX/in_intensityY_uvb_raw
>  What:		/sys/.../iio:deviceX/in_intensityY_duv_raw
>  KernelVersion:	3.4
>  Contact:	linux-iio@...r.kernel.org
> @@ -1597,9 +1595,8 @@ Description:
>  		that measurements contain visible and infrared light
>  		components or just infrared light, respectively. Modifier
>  		uv indicates that measurements contain ultraviolet light
> -		components. Modifiers uva, uvb and duv indicate that
> -		measurements contain A, B or deep (C) ultraviolet light
> -		components respectively.
> +		components. Modifier duv indicates that measurements
> +		contain deep ultraviolet light components.
>  
>  What:		/sys/.../iio:deviceX/in_uvindex_input
>  KernelVersion:	4.6
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 9a85752124dd..bce09d325142 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -117,8 +117,6 @@ static const char * const iio_modifier_names[] = {
>  	[IIO_MOD_LIGHT_GREEN] = "green",
>  	[IIO_MOD_LIGHT_BLUE] = "blue",
>  	[IIO_MOD_LIGHT_UV] = "uv",
> -	[IIO_MOD_LIGHT_UVA] = "uva",
> -	[IIO_MOD_LIGHT_UVB] = "uvb",
>  	[IIO_MOD_LIGHT_DUV] = "duv",
>  	[IIO_MOD_QUATERNION] = "quaternion",
>  	[IIO_MOD_TEMP_AMBIENT] = "ambient",
> diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
> index 5060963707b1..9c2ffdcd6623 100644
> --- a/include/uapi/linux/iio/types.h
> +++ b/include/uapi/linux/iio/types.h
> @@ -91,8 +91,6 @@ enum iio_modifier {
>  	IIO_MOD_CO2,
>  	IIO_MOD_VOC,
>  	IIO_MOD_LIGHT_UV,
> -	IIO_MOD_LIGHT_UVA,
> -	IIO_MOD_LIGHT_UVB,
>  	IIO_MOD_LIGHT_DUV,
>  	IIO_MOD_PM1,
>  	IIO_MOD_PM2P5,
> diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
> index 8073c9e4fe46..2eaaa7123b04 100644
> --- a/tools/iio/iio_event_monitor.c
> +++ b/tools/iio/iio_event_monitor.c
> @@ -105,8 +105,6 @@ static const char * const iio_modifier_names[] = {
>  	[IIO_MOD_LIGHT_GREEN] = "green",
>  	[IIO_MOD_LIGHT_BLUE] = "blue",
>  	[IIO_MOD_LIGHT_UV] = "uv",
> -	[IIO_MOD_LIGHT_UVA] = "uva",
> -	[IIO_MOD_LIGHT_UVB] = "uvb",
>  	[IIO_MOD_LIGHT_DUV] = "duv",
>  	[IIO_MOD_QUATERNION] = "quaternion",
>  	[IIO_MOD_TEMP_AMBIENT] = "ambient",
Oops, sorry about that. You are right, I will send a new patch with the
new elements at the end of the enum. This patch should be applied to get
things right again, though.

Thanks and best regards,
Javier Carrasco