Re: [PATCH v9 13/22] ACPI: platform_profile: Add profile attribute for class interface

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

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On Sun, 1 Dec 2024, Mario Limonciello wrote:

> Reading and writing the `profile` sysfs file will use the callbacks for
> the platform profile handler to read or set the given profile.
> 
> Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
> Reviewed-by: Armin Wolf <W_Armin@gmx.de>
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>


Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

-- 
 i.

> ---
> v8:
>  * whitespace
>  * rename variables
> ---
>  drivers/acpi/platform_profile.c | 102 ++++++++++++++++++++++++++++++++
>  1 file changed, 102 insertions(+)
> 
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 885f41bca6c25..fdff374aab128 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -47,6 +47,52 @@ static ssize_t _commmon_choices_show(unsigned long *choices, char *buf)
>  	return len;
>  }
>  
> +/**
> + * _store_class_profile - Set the profile for a class device
> + * @dev: The class device
> + * @data: The profile to set
> + */
> +static int _store_class_profile(struct device *dev, void *data)
> +{
> +	struct platform_profile_handler *handler;
> +	int *bit = (int *)data;
> +
> +	lockdep_assert_held(&profile_lock);
> +	handler = dev_get_drvdata(dev);
> +	if (!test_bit(*bit, handler->choices))
> +		return -EOPNOTSUPP;
> +
> +	return handler->profile_set(handler, *bit);
> +}
> +
> +/**
> + * get_class_profile - Show the current profile for a class device
> + * @dev: The class device
> + * @profile: The profile to return
> + * Return: 0 on success, -errno on failure
> + */
> +static int get_class_profile(struct device *dev,
> +			     enum platform_profile_option *profile)
> +{
> +	struct platform_profile_handler *handler;
> +	enum platform_profile_option val;
> +	int err;
> +
> +	lockdep_assert_held(&profile_lock);
> +	handler = dev_get_drvdata(dev);
> +	err = handler->profile_get(handler, &val);
> +	if (err) {
> +		pr_err("Failed to get profile for handler %s\n", handler->name);
> +		return err;
> +	}
> +
> +	if (WARN_ON(val >= PLATFORM_PROFILE_LAST))
> +		return -EINVAL;
> +	*profile = val;
> +
> +	return 0;
> +}
> +
>  /**
>   * name_show - Show the name of the profile handler
>   * @dev: The device
> @@ -81,9 +127,65 @@ static ssize_t choices_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(choices);
>  
> +/**
> + * profile_show - Show the current profile for a class device
> + * @dev: The device
> + * @attr: The attribute
> + * @buf: The buffer to write to
> + *
> + * Return: The number of bytes written
> + */
> +static ssize_t profile_show(struct device *dev,
> +			    struct device_attribute *attr,
> +			    char *buf)
> +{
> +	enum platform_profile_option profile = PLATFORM_PROFILE_LAST;
> +	int err;
> +
> +	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> +		err = get_class_profile(dev, &profile);
> +		if (err)
> +			return err;
> +	}
> +
> +	return sysfs_emit(buf, "%s\n", profile_names[profile]);
> +}
> +
> +/**
> + * profile_store - Set the profile for a class device
> + * @dev: The device
> + * @attr: The attribute
> + * @buf: The buffer to read from
> + * @count: The number of bytes to read
> + *
> + * Return: The number of bytes read
> + */
> +static ssize_t profile_store(struct device *dev,
> +			     struct device_attribute *attr,
> +			     const char *buf, size_t count)
> +{
> +	int index, ret;
> +
> +	index = sysfs_match_string(profile_names, buf);
> +	if (index < 0)
> +		return -EINVAL;
> +
> +	scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> +		ret = _store_class_profile(dev, &index);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	sysfs_notify(acpi_kobj, NULL, "platform_profile");
> +
> +	return count;
> +}
> +static DEVICE_ATTR_RW(profile);
> +
>  static struct attribute *profile_attrs[] = {
>  	&dev_attr_name.attr,
>  	&dev_attr_choices.attr,
> +	&dev_attr_profile.attr,
>  	NULL
>  };
>  ATTRIBUTE_GROUPS(profile);
>