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HID: asus: Implement Fn+F5 fan control key handler

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On Asus ROG laptops, the Fn+F5 key (HID code 0xae) is used to cycle
through fan modes. This key press needs to be forwarded to the asus-wmi
driver to actually change the fan mode.

Add ASUS_FAN_CTRL_KEY_CODE define and implement the handler in
asus_raw_event() to send WMI events when this key is pressed.

When asus-wmi successfully handles the event, it is blocked from reaching
userspace. If asus-wmi is unavailable or fails, the event is passed to
userspace via evdev, allowing userspace implementations of fan control.

Tested on Asus ROG G14/G15 series laptops.

Reviewed-by: Denis Benato <benato.denis96@gmail.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Ionut Nechita <ionut_n2001@yahoo.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Ionut Nechita
2026-01-07 17:42:24 +02:00
committed by Jiri Kosina
parent c888d0bd05
commit 1489a34e97
1 changed files with 30 additions and 5 deletions
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35
drivers/hid/hid-asus.c
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@@ -64,6 +64,9 @@ MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad");
#define ASUS_SPURIOUS_CODE_0X8A 0x8a
#define ASUS_SPURIOUS_CODE_0X9E 0x9e
/* Special key codes */
#define ASUS_FAN_CTRL_KEY_CODE 0xae
#define SUPPORT_KBD_BACKLIGHT BIT(0)
#define MAX_TOUCH_MAJOR 8
@@ -378,12 +381,34 @@ static int asus_raw_event(struct hid_device *hdev,
if (report->id == FEATURE_KBD_LED_REPORT_ID1 || report->id == FEATURE_KBD_LED_REPORT_ID2)
return -1;
if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
/*
* ASUS ROG laptops send these codes during normal operation
* with no discernable reason. Filter them out to avoid
* unmapped warning messages.
*/
if (report->id == FEATURE_KBD_REPORT_ID) {
/*
* Fn+F5 fan control key - try to send WMI event to toggle fan mode.
* If successful, block the event from reaching userspace.
* If asus-wmi is unavailable or the call fails, let the event
* pass to userspace so it can implement its own fan control.
*/
if (data[1] == ASUS_FAN_CTRL_KEY_CODE) {
int ret = asus_wmi_send_event(drvdata, ASUS_FAN_CTRL_KEY_CODE);
if (ret == 0) {
/* Successfully handled by asus-wmi, block event */
return -1;
}
/*
* Warn if asus-wmi failed (but not if it's unavailable).
* Let the event reach userspace in all failure cases.
*/
if (ret != -ENODEV)
hid_warn(hdev, "Failed to notify asus-wmi: %d\n", ret);
}
/*
* ASUS ROG laptops send these codes during normal operation
* with no discernable reason. Filter them out to avoid
* unmapped warning messages.
*/
if (data[1] == ASUS_SPURIOUS_CODE_0XEA ||
data[1] == ASUS_SPURIOUS_CODE_0XEC ||
data[1] == ASUS_SPURIOUS_CODE_0X02 ||