[PATCH v2 01/12] HID: asus: reinitialize the device after exiting a sleep state

[Denis Benato <denis.benato@linux.dev>]

The ROG ally needs to have the EC string sent back after resuming from
s2idle since the USB device can be turned completely off by the firmware
when mcu_powersave firmware-attribute is set to 1.

This may also be true for other laptops and certain features might stop
working after the device exit from sleep.

Assisted-by: opencode:glm-5.2
Signed-off-by: Denis Benato <denis.benato@linux.dev>
---
 drivers/hid/hid-asus.c | 33 +++++++++++++++++++++++++--------
 1 file changed, 25 insertions(+), 8 deletions(-)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index ec966fc0a411..9ce21fcc7d2e 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -1360,6 +1360,28 @@ static int asus_start_multitouch(struct hid_device *hdev)
 	return 0;
 }
 
+/*
+ * Initialize the reports of the device.
+ *
+ * Failures are intentionally not fatal: asus_kbd_init() tolerates a wrong
+ * handshake until this is verified to work for all devices, so a failure
+ * is only reported and the initialization of the remaining reports is
+ * still attempted.
+ */
+static void asus_initialize_reports(struct hid_device *hdev)
+{
+	int ret;
+
+	for (int r = 0; r < ARRAY_SIZE(asus_report_id_init); r++) {
+		if (asus_has_report_id(hdev, asus_report_id_init[r])) {
+			ret = asus_kbd_init(hdev, asus_report_id_init[r]);
+			if (ret < 0)
+				hid_warn(hdev, "Failed to initialize 0x%x: %d.\n",
+					 asus_report_id_init[r], ret);
+		}
+	}
+}
+
 static int __maybe_unused asus_resume(struct hid_device *hdev)
 {
 	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
@@ -1379,6 +1401,8 @@ static int __maybe_unused asus_reset_resume(struct hid_device *hdev)
 {
 	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
 
+	asus_initialize_reports(hdev);
+
 	if (drvdata->tp)
 		return asus_start_multitouch(hdev);
 
@@ -1493,14 +1517,7 @@ static int asus_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		return ret;
 	}
 
-	for (int r = 0; r < ARRAY_SIZE(asus_report_id_init); r++) {
-		if (asus_has_report_id(hdev, asus_report_id_init[r])) {
-			ret = asus_kbd_init(hdev, asus_report_id_init[r]);
-			if (ret < 0)
-				hid_warn(hdev, "Failed to initialize 0x%x: %d.\n",
-					 asus_report_id_init[r], ret);
-		}
-	}
+	asus_initialize_reports(hdev);
 
 	/* Laptops keyboard backlight is always at 0x5a */
 	if (is_vendor && (drvdata->quirks & QUIRK_USE_KBD_BACKLIGHT) &&
-- 
2.47.3