linux-kernel - Re: [PATCH] hwmon: Add a new macro sensor_sysfs

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Date:   Thu, 9 Nov 2023 18:50:46 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Ma, Jun" <majun@....com>, Ma Jun <Jun.Ma2@....com>,
        jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: Add a new macro sensor_sysfs_attr

On 11/9/23 17:15, Ma, Jun wrote:
> Hi Guenter,
> 
> On 11/9/2023 1:28 PM, Guenter Roeck wrote:
>> On 11/8/23 21:14, Ma Jun wrote:
>>> The attribute definiations like &sensor_dev_attr_xx_xx.dev_attr.attr
>>> are widely used in drivers. So add a new macro sensor_sysfs_attr t
>>> to make it easier to understand and use.
>>>
>>> For example, user can use the sensor_sysfs_attr(xx_xx) instead of
>>> &sensor_dev_attr_xx_xx.dev_attr.attr
>>>
>>> Signed-off-by: Ma Jun <Jun.Ma2@....com>
>>> ---
>>>    include/linux/hwmon-sysfs.h | 4 ++++
>>>    1 file changed, 4 insertions(+)
>>>
>>> diff --git a/include/linux/hwmon-sysfs.h b/include/linux/hwmon-sysfs.h
>>> index d896713359cd..7feae637e3b5 100644
>>> --- a/include/linux/hwmon-sysfs.h
>>> +++ b/include/linux/hwmon-sysfs.h
>>> @@ -14,6 +14,10 @@ struct sensor_device_attribute{
>>>    	struct device_attribute dev_attr;
>>>    	int index;
>>>    };
>>> +
>>> +#define to_sensor_sysfs_attr(_name) \
>>> +	(&sensor_dev_attr_##_name.dev_attr.attr)
>>> +
>>>    #define to_sensor_dev_attr(_dev_attr) \
>>>    	container_of(_dev_attr, struct sensor_device_attribute, dev_attr)
>>>    
>>
>> No. This would just invite people to submit patches converting existing code
>> to use this new macro. Instead of providing macros to support deprecated APIs,
>> convert drivers to use an API which is not deprecated. This would for the
> 
> Which API is not deprecated do you mean?
> 

[devm_]hwmon_device_register_with_info(). I don't want to encourage
the use of non-standard sysfs atributes either (and, no, I still
don't accept the idea that "frequency" would be a hardware monitoring
attribute).

Guenter