Unverified Commit d2785e39 authored by Mario Limonciello's avatar Mario Limonciello Committed by Ilpo Järvinen
Browse files

ACPI: platform_profile: Add profile attribute for class interface 



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: default avatarMark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: default avatarMark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: default avatarArmin Wolf <W_Armin@gmx.de>
Reviewed-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20241206031918.1537-14-mario.limonciello@amd.com


Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
parent 52a67be8

drivers/acpi/platform_profile.c

+105 −0
Original line number Diff line number Diff line
@@ -47,6 +47,55 @@ 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

 *

 * Return: 0 on success, -errno on failure

 */

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 +130,65 @@ 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);