Patch "HID: hid-asus: reset the backlight brightness level on resume" has been added to the 4.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    HID: hid-asus: reset the backlight brightness level on resume

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hid-hid-asus-reset-the-backlight-brightness-level-on.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 31f301383661a3996a9ef6fc8a8f609342c928da
Author: Denis Benato <benato.denis96@xxxxxxxxx>
Date:   Fri Nov 17 14:15:56 2023 +1300

    HID: hid-asus: reset the backlight brightness level on resume
    
    [ Upstream commit 546edbd26cff7ae990e480a59150e801a06f77b1 ]
    
    Some devices managed by this driver automatically set brightness to 0
    before entering a suspended state and reset it back to a default
    brightness level after the resume:
    this has the effect of having the kernel report wrong brightness
    status after a sleep, and on some devices (like the Asus RC71L) that
    brightness is the intensity of LEDs directly facing the user.
    
    Fix the above issue by setting back brightness to the level it had
    before entering a sleep state.
    
    Signed-off-by: Denis Benato <benato.denis96@xxxxxxxxx>
    Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
    Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index 4dddf3ce32d73..12ad6493be8f4 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -614,6 +614,24 @@ static int asus_start_multitouch(struct hid_device *hdev)
 	return 0;
 }
 
+static int __maybe_unused asus_resume(struct hid_device *hdev) {
+	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
+	int ret = 0;
+
+	if (drvdata->kbd_backlight) {
+		const u8 buf[] = { FEATURE_KBD_REPORT_ID, 0xba, 0xc5, 0xc4,
+				drvdata->kbd_backlight->cdev.brightness };
+		ret = asus_kbd_set_report(hdev, buf, sizeof(buf));
+		if (ret < 0) {
+			hid_err(hdev, "Asus failed to set keyboard backlight: %d\n", ret);
+			goto asus_resume_err;
+		}
+	}
+
+asus_resume_err:
+	return ret;
+}
+
 static int __maybe_unused asus_reset_resume(struct hid_device *hdev)
 {
 	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
@@ -831,6 +849,7 @@ static struct hid_driver asus_driver = {
 	.input_configured       = asus_input_configured,
 #ifdef CONFIG_PM
 	.reset_resume           = asus_reset_resume,
+	.resume					= asus_resume,
 #endif
 	.raw_event		= asus_raw_event
 };