On 28-04-2025 06:48, Derek J. Clark wrote:
Adds lenovo-wmi-other driver which provides the Lenovo "Other Mode" WMI
interface that comes on some Lenovo "Gaming Series" hardware. Provides a
firmware-attributes class which enables the use of tunable knobs for SPL,
SPPT, and FPPT.
Signed-off-by: Derek J. Clark <derekjohn.clark@xxxxxxxxx>
---
+++ b/drivers/platform/x86/lenovo-wmi-other.c
@@ -0,0 +1,655 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Lenovo Other Mode WMI interface driver.
+ *
+ * This driver uses the fw_attributes class to expose the various WMI functions
+ * provided by the "Other Mode" WMI interface. This enables CPU and GPU power
+ * limit as well as various other attributes for devices that fall under the
+ * "Gaming Series" of Lenovo laptop devices. Each attribute exposed by the
+ * "Other Mode"" interface has a corresponding Capability Data struct that
typo "Other Mode"" -> "Other Mode"
+ * allows the driver to probe details about the attribute such as if it is
+ * supported by the hardware, the default_value, max_value, min_value, and step
+ * increment.
+ *
+ * These attributes typically don't fit anywhere else in the sysfs and are set
+ * in Windows using one of Lenovo's multiple user applications.
+ *
+ * Copyright(C) 2025 Derek J. Clark <derekjohn.clark@xxxxxxxxx>
+ */
+
[clip]
+
+/**
+ * lwmi_om_register_notifier() - Add a notifier to the blocking notifier chain
+ * @nb: The notifier_block struct to register
+ *
+ * Call blocking_notifier_chain_register to register the notifier block to the
+ * lenovo-wmi-other driver notifer chain.
typo notifer -> notifier
+ *
+ * Return: 0 on success, %-EEXIST on error.
+ */
+int lwmi_om_register_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&om_chain_head, nb);
+}
+EXPORT_SYMBOL_NS_GPL(lwmi_om_register_notifier, "LENOVO_WMI_OTHER");
+
+/**
+ * lwmi_om_unregister_notifier() - Remove a notifier from the blocking notifier
+ * chain.
+ * @nb: The notifier_block struct to register
+ *
+ * Call blocking_notifier_chain_unregister to unregister the notifier block from the
+ * lenovo-wmi-other driver notifer chain.
+ *
+ * Return: 0 on success, %-ENOENT on error.
+ */
+int lwmi_om_unregister_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&om_chain_head, nb);
+}
+EXPORT_SYMBOL_NS_GPL(lwmi_om_unregister_notifier, "LENOVO_WMI_OTHER");
+
+/**
+ * devm_lwmi_om_unregister_notifier() - Remove a notifier from the blocking
+ * notifier chain.
+ * @data: Void pointer to the notifier_block struct to register.
+ *
+ * Call lwmi_om_unregister_notifier to unregister the notifier block from the
+ * lenovo-wmi-other driver notifer chain.
typo notifer -> notifier
+ *
+ * Return: 0 on success, %-ENOENT on error.
+ */
+static void devm_lwmi_om_unregister_notifier(void *data)
+{
+ struct notifier_block *nb = data;
+
+ lwmi_om_unregister_notifier(nb);
+}
+
+/**
+ * devm_lwmi_om_register_notifier() - Add a notifier to the blocking notifier
+ * chain.
+ * @dev: The parent device of the notifier_block struct.
+ * @nb: The notifier_block struct to register
+ *
+ * Call lwmi_om_register_notifier to register the notifier block to the
+ * lenovo-wmi-other driver notifer chain. Then add devm_lwmi_om_unregister_notifier
typo notifer -> notifier
+ * as a device managed ation to automatically unregister the notifier block
typo ation
+ * upon parent device removal.
+ *
+ * Return: 0 on success, or on error.
+ */
+int devm_lwmi_om_register_notifier(struct device *dev,
+ struct notifier_block *nb)
+{
+ int ret;
+
+ ret = lwmi_om_register_notifier(nb);
+ if (ret < 0)
+ return ret;
+
Thanks,
Alok
