--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Lenovo Super Hotkey Utility WMI extras driver for Ideapad laptop
+ *
+ * Copyright (C) 2025 Lenovo
+ */
+
+#include <linux/cleanup.h>
+#include <linux/dev_printk.h>
+#include <linux/device.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/wmi.h>
+
+/* Lenovo Super Hotkey WMI GUIDs */
+#define LUD_WMI_METHOD_GUID "CE6C0974-0407-4F50-88BA-4FC3B6559AD8"
+
+/* Lenovo Utility Data WMI method_id */
+#define WMI_LUD_GET_SUPPORT 1
+#define WMI_LUD_SET_FEATURE 2
+
+#define WMI_LUD_GET_MICMUTE_LED_VER 20
+#define WMI_LUD_GET_AUDIOMUTE_LED_VER 26
+
+#define WMI_LUD_SUPPORT_MICMUTE_LED_VER 25
+#define WMI_LUD_SUPPORT_AUDIOMUTE_LED_VER 27
+
+/* Input parameters to mute/unmute audio LED and Mic LED */
+struct wmi_led_args {
+ u8 id;
+ u8 subid;
+ u16 value;
+};
+
+/* Values of input parameters to SetFeature of audio LED and Mic LED */
+enum hotkey_set_feature {
+ MIC_MUTE_LED_ON = 1,
+ MIC_MUTE_LED_OFF = 2,
+ AUDIO_MUTE_LED_ON = 4,
+ AUDIO_MUTE_LED_OFF = 5,
+};
+
+#define LSH_ACPI_LED_MAX 2
+
+struct lenovo_super_hotkey_wmi_private {
+ struct led_classdev cdev[LSH_ACPI_LED_MAX];
+ struct wmi_device *led_wdev;
+};
+
+enum mute_led_type {
+ MIC_MUTE,
+ AUDIO_MUTE,
+};
+
+static int lsh_wmi_mute_led_set(enum mute_led_type led_type, struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+
+{
+ struct lenovo_super_hotkey_wmi_private *wpriv = container_of(led_cdev,
+ struct lenovo_super_hotkey_wmi_private, cdev[led_type]);
+ struct wmi_led_args led_arg = {0, 0, 0};
+ struct acpi_buffer input;
+ acpi_status status;
+
+ switch (led_type) {
+ case MIC_MUTE:
+ led_arg.id = brightness == LED_ON ? MIC_MUTE_LED_ON : MIC_MUTE_LED_OFF;
+ break;
+ case AUDIO_MUTE:
+ led_arg.id = brightness == LED_ON ? AUDIO_MUTE_LED_ON : AUDIO_MUTE_LED_OFF;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ input.length = sizeof(led_arg);
+ input.pointer = &led_arg;
+ status = wmidev_evaluate_method(wpriv->led_wdev, 0, WMI_LUD_SET_FEATURE, &input, NULL);
+ if (ACPI_FAILURE(status))
+ return -EIO;
+
+ return 0;
+}
+
+static int lsh_wmi_audiomute_led_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+
+{
+ return lsh_wmi_mute_led_set(AUDIO_MUTE, led_cdev, brightness);
+}
+
+static int lsh_wmi_micmute_led_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ return lsh_wmi_mute_led_set(MIC_MUTE, led_cdev, brightness);
+}
+
+static int lenovo_super_hotkey_wmi_led_init(enum mute_led_type led_type, struct device *dev)
+{
+ struct lenovo_super_hotkey_wmi_private *wpriv = dev_get_drvdata(dev);
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_buffer input;
+ int led_version, err = 0;
+ unsigned int wmiarg;
+ acpi_status status;
+
+ switch (led_type) {
+ case MIC_MUTE:
+ wmiarg = WMI_LUD_GET_MICMUTE_LED_VER;
+ break;
+ case AUDIO_MUTE:
+ wmiarg = WMI_LUD_GET_AUDIOMUTE_LED_VER;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ input.length = sizeof(wmiarg);
+ input.pointer = &wmiarg;
+ status = wmidev_evaluate_method(wpriv->led_wdev, 0, WMI_LUD_GET_SUPPORT, &input, &output);
+ if (ACPI_FAILURE(status))
+ return -EIO;
+
+ union acpi_object *obj __free(kfree) = output.pointer;
+ if (obj && obj->type == ACPI_TYPE_INTEGER)
+ led_version = obj->integer.value;
+ else
+ return -EIO;
+
+ wpriv->cdev[led_type].max_brightness = LED_ON;
+ wpriv->cdev[led_type].flags = LED_CORE_SUSPENDRESUME;
+
+ switch (led_type) {
+ case MIC_MUTE:
+ if (led_version != WMI_LUD_SUPPORT_MICMUTE_LED_VER)
+ return -EIO;
+
+ wpriv->cdev[led_type].name = "platform::micmute";
+ wpriv->cdev[led_type].brightness_set_blocking = &lsh_wmi_micmute_led_set;
+ wpriv->cdev[led_type].default_trigger = "audio-micmute";
+ break;
+ case AUDIO_MUTE:
+ if (led_version != WMI_LUD_SUPPORT_AUDIOMUTE_LED_VER)
+ return -EIO;
+
+ wpriv->cdev[led_type].name = "platform::mute";
+ wpriv->cdev[led_type].brightness_set_blocking = &lsh_wmi_audiomute_led_set;
+ wpriv->cdev[led_type].default_trigger = "audio-mute";
+ break;
+ default:
+ dev_err(dev, "Unknown LED type %d\n", led_type);
+ return -EINVAL;
+ }
+
+ err = devm_led_classdev_register(dev, &wpriv->cdev[led_type]);
+ if (err < 0) {
+ dev_err(dev, "Could not register mute LED %d : %d\n", led_type, err);
+ return err;
+ }
+ return 0;
+}
+
+static int lenovo_super_hotkey_wmi_leds_setup(struct device *dev)
+{
+ int err;
+
+ err = lenovo_super_hotkey_wmi_led_init(MIC_MUTE, dev);
+ if (err)
+ return err;
+
+ err = lenovo_super_hotkey_wmi_led_init(AUDIO_MUTE, dev);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static int lenovo_super_hotkey_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+ struct lenovo_super_hotkey_wmi_private *wpriv;
+
+ wpriv = devm_kzalloc(&wdev->dev, sizeof(*wpriv), GFP_KERNEL);
+ if (!wpriv)
+ return -ENOMEM;
+
+ dev_set_drvdata(&wdev->dev, wpriv);
+ wpriv->led_wdev = wdev;
+ return lenovo_super_hotkey_wmi_leds_setup(&wdev->dev);
+}
+
+static const struct wmi_device_id lenovo_super_hotkey_wmi_id_table[] = {
+ { LUD_WMI_METHOD_GUID, NULL }, /* Utility data */
+ { }
+};
+
+MODULE_DEVICE_TABLE(wmi, lenovo_super_hotkey_wmi_id_table);
+
+static struct wmi_driver lenovo_wmi_hotkey_utilities_driver = {
+ .driver = {
+ .name = "lenovo_wmi_hotkey_utilities",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS
+ },
+ .id_table = lenovo_super_hotkey_wmi_id_table,
+ .probe = lenovo_super_hotkey_wmi_probe,
+ .no_singleton = true,
+};
+
+module_wmi_driver(lenovo_wmi_hotkey_utilities_driver);
+
+MODULE_AUTHOR("Jackie Dong <dongeg1@lenovo.com>");
+MODULE_DESCRIPTION("Lenovo Super Hotkey Utility WMI extras driver");
+MODULE_LICENSE("GPL");
projects / thirdparty / linux.git / commitdiff
