linux-kernel - Re: [PATCH 5.4 1/2] hwmon: Introduce hwmon_device_register_for

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Date:   Wed, 22 Jun 2022 08:02:34 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Julian Haller <julian.haller@...lips.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH 5.4 1/2] hwmon: Introduce
 hwmon_device_register_for_thermal

On Wed, Jun 22, 2022 at 04:49:01PM +0200, Julian Haller wrote:
> From: Guenter Roeck <linux@...ck-us.net>
> 
> [ upstream commit e5d21072054fbadf41cd56062a3a14e447e8c22b ]
> 
> The thermal subsystem registers a hwmon driver without providing
> chip or sysfs group information. This is for legacy reasons and
> would be difficult to change. At the same time, we want to enforce
> that chip information is provided when registering a hwmon device
> using hwmon_device_register_with_info(). To enable this, introduce
> a special API for use only by the thermal subsystem.
> 
> Acked-by: Rafael J . Wysocki <rafael@...nel.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

What is the point of applying those patches to the 5.4 kernel ?
This was intended for use with new code, not for stable releases.

Guenter

> ---
>  drivers/hwmon/hwmon.c | 25 +++++++++++++++++++++++++
>  include/linux/hwmon.h |  3 +++
>  2 files changed, 28 insertions(+)
> 
> diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
> index c73b93b9bb87..e8a9955e3683 100644
> --- a/drivers/hwmon/hwmon.c
> +++ b/drivers/hwmon/hwmon.c
> @@ -743,6 +743,31 @@ hwmon_device_register_with_info(struct device *dev, const char *name,
>  }
>  EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
>  
> +/**
> + * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem
> + * @dev: the parent device
> + * @name: hwmon name attribute
> + * @drvdata: driver data to attach to created device
> + *
> + * The use of this function is restricted. It is provided for legacy reasons
> + * and must only be called from the thermal subsystem.
> + *
> + * hwmon_device_unregister() must be called when the device is no
> + * longer needed.
> + *
> + * Returns the pointer to the new device.
> + */
> +struct device *
> +hwmon_device_register_for_thermal(struct device *dev, const char *name,
> +				  void *drvdata)
> +{
> +	if (!name || !dev)
> +		return ERR_PTR(-EINVAL);
> +
> +	return __hwmon_device_register(dev, name, drvdata, NULL, NULL);
> +}
> +EXPORT_SYMBOL_GPL(hwmon_device_register_for_thermal);
> +
>  /**
>   * hwmon_device_register - register w/ hwmon
>   * @dev: the device to register
> diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
> index 72579168189d..104c492959b9 100644
> --- a/include/linux/hwmon.h
> +++ b/include/linux/hwmon.h
> @@ -408,6 +408,9 @@ hwmon_device_register_with_info(struct device *dev,
>  				const struct hwmon_chip_info *info,
>  				const struct attribute_group **extra_groups);
>  struct device *
> +hwmon_device_register_for_thermal(struct device *dev, const char *name,
> +				  void *drvdata);
> +struct device *
>  devm_hwmon_device_register_with_info(struct device *dev,
>  				const char *name, void *drvdata,
>  				const struct hwmon_chip_info *info,
> -- 
> 2.25.1
>