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

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Message-ID: <efdfb611-5ba4-4cd6-a7f0-bd96259cf1a6@gmail.com>
Date: Tue, 23 Jan 2024 11:56:07 +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 11:55, Paul Cercueil wrote:
> Hi Javier,
> 
> Le mardi 23 janvier 2024 à 11:51 +0100, Javier Carrasco a écrit :
>> 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.
> 
> Np.
> 
> I notice now that we can't really apply the revert as the veml6075
> driver is already using these enum values - so applying it would result
> in build errors.
> 
> Can you just move these entries to the end of the enum in your new
> patch?
> 
>>
>> Thanks and best regards,
>> Javier Carrasco
> 
> Cheers,
> -Paul
Sure, I will do it right now.

Thank you again and best regards,
Javier Carrasco