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

Mario Limonciello
2024-12-02T05:51:54Z

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>
---
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);
--
2.43.0