linux-kernel - Re: [PATCH v2 2/4] hwmon: (core) Add support for humidity min/max alarm

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Date:   Thu, 9 Nov 2023 07:24:00 +0100
From:   Javier Carrasco <javier.carrasco.cruz@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 2/4] hwmon: (core) Add support for humidity min/max
 alarm

Hello,

On 09.11.23 01:02, Guenter Roeck wrote:
> On 11/8/23 07:37, Javier Carrasco wrote:
>> Add min_alarm and max_alarm attributes for humidityX to support devices
>> that can generate these alarms.
>> Such attributes already exist for other magnitudes such as tempX.
>>
>> Tested with a ChipCap 2 temperature-humidity sensor.
>>
> 
> No objection, but the new attributes also need to be added to the ABI
> documentation at
> Documentation/ABI/testing/sysfs-class-hwmon and
> Documentation/hwmon/sysfs-interface.rst
> 
> Which made me notice that humidityX_alarm isn't documented either.
> Please document that attribute as well while you are at it.
> 
> Thanks,
> Guenter
> 
Actually there are several attributes without ABI documentation or at
least the attributes enum is much larger than the objects in the ABI
documentation (in testing/sysfs-class-hwmon).
For humidity there is only input, enable, rated_min and rated_max. Are
some attributes not described for a good reason or should all be
documented? the current humidity_attributes contains:

hwmon_humidity_enable -> documented in sysfs-class-hwmon
hwmon_humidity_input -> documented in sysfs-class-hwmon
hwmon_humidity_label
hwmon_humidity_min
hwmon_humidity_min_hyst
hwmon_humidity_max
hwmon_humidity_max_hyst
hwmon_humidity_alarm
hwmon_humidity_fault
hwmon_humidity_rated_min -> documented in sysfs-class-hwmon
hwmon_humidity_rated_max -> documented in sysfs-class-hwmon

I could not find the temperature counterparts of my new additions
(temp_min_alarm and temp_max_alarm).

Should all be added to sysfs-class-hwmon or am I missing some other
document? I am alright adding the ones I mentioned.

>> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
>> ---
>>   drivers/hwmon/hwmon.c | 2 ++
>>   include/linux/hwmon.h | 4 ++++
>>   2 files changed, 6 insertions(+)
>>
>> diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
>> index c7dd3f5b2bd5..7f92984c37d9 100644
>> --- a/drivers/hwmon/hwmon.c
>> +++ b/drivers/hwmon/hwmon.c
>> @@ -579,8 +579,10 @@ static const char * const
>> hwmon_humidity_attr_templates[] = {
>>       [hwmon_humidity_input] = "humidity%d_input",
>>       [hwmon_humidity_label] = "humidity%d_label",
>>       [hwmon_humidity_min] = "humidity%d_min",
>> +    [hwmon_humidity_min_alarm] = "humidity%d_min_alarm",
>>       [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
>>       [hwmon_humidity_max] = "humidity%d_max",
>> +    [hwmon_humidity_max_alarm] = "humidity%d_max_alarm",
>>       [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
>>       [hwmon_humidity_alarm] = "humidity%d_alarm",
>>       [hwmon_humidity_fault] = "humidity%d_fault",
>> diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
>> index 8cd6a6b33593..154de35e34ac 100644
>> --- a/include/linux/hwmon.h
>> +++ b/include/linux/hwmon.h
>> @@ -286,8 +286,10 @@ enum hwmon_humidity_attributes {
>>       hwmon_humidity_input,
>>       hwmon_humidity_label,
>>       hwmon_humidity_min,
>> +    hwmon_humidity_min_alarm,
>>       hwmon_humidity_min_hyst,
>>       hwmon_humidity_max,
>> +    hwmon_humidity_max_alarm,
>>       hwmon_humidity_max_hyst,
>>       hwmon_humidity_alarm,
>>       hwmon_humidity_fault,
>> @@ -299,8 +301,10 @@ enum hwmon_humidity_attributes {
>>   #define HWMON_H_INPUT            BIT(hwmon_humidity_input)
>>   #define HWMON_H_LABEL            BIT(hwmon_humidity_label)
>>   #define HWMON_H_MIN            BIT(hwmon_humidity_min)
>> +#define HWMON_H_MIN_ALARM        BIT(hwmon_humidity_min_alarm)
>>   #define HWMON_H_MIN_HYST        BIT(hwmon_humidity_min_hyst)
>>   #define HWMON_H_MAX            BIT(hwmon_humidity_max)
>> +#define HWMON_H_MAX_ALARM        BIT(hwmon_humidity_max_alarm)
>>   #define HWMON_H_MAX_HYST        BIT(hwmon_humidity_max_hyst)
>>   #define HWMON_H_ALARM            BIT(hwmon_humidity_alarm)
>>   #define HWMON_H_FAULT            BIT(hwmon_humidity_fault)
>>
> 
Best regards,
Javier Carrasco