Revert "platform/x86: asus-wmi: Support WMI event queue"

This reverts commit 1a373d15.

The WMI core now takes care of draining the event queue if asus-wmi
is not loaded, so the hacky event queue handling code is not needed
anymore.
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20240219115919.16526-6-W_Armin@gmx.deReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

drivers/platform/x86/asus-wmi.c

@@ -101,13 +101,6 @@ module_param(fnlock_default, bool, 0444);
 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI	0x9c31
 
 #define ASUS_ACPI_UID_ASUSWMI		"ASUSWMI"
-#define ASUS_ACPI_UID_ATK		"ATK"
-
-#define WMI_EVENT_QUEUE_SIZE		0x10
-#define WMI_EVENT_QUEUE_END		0x1
-#define WMI_EVENT_MASK			0xFFFF
-/* The WMI hotkey event value is always the same. */
-#define WMI_EVENT_VALUE_ATK		0xFF
 
 #define WMI_EVENT_MASK			0xFFFF
 
@@ -219,7 +212,6 @@ struct asus_wmi {
 	int dsts_id;
 	int spec;
 	int sfun;
-	bool wmi_event_queue;
 
 	struct input_dev *inputdev;
 	struct backlight_device *backlight_device;
@@ -4019,50 +4011,14 @@ static void asus_wmi_handle_event_code(int code, struct asus_wmi *asus)
 static void asus_wmi_notify(u32 value, void *context)
 {
 	struct asus_wmi *asus = context;
-	int code;
-	int i;
-
-	for (i = 0; i < WMI_EVENT_QUEUE_SIZE + 1; i++) {
-		code = asus_wmi_get_event_code(value);
-		if (code < 0) {
-			pr_warn("Failed to get notify code: %d\n", code);
-			return;
-		}
-
-		if (code == WMI_EVENT_QUEUE_END || code == WMI_EVENT_MASK)
-			return;
-
-		asus_wmi_handle_event_code(code, asus);
-
-		/*
-		 * Double check that queue is present:
-		 * ATK (with queue) uses 0xff, ASUSWMI (without) 0xd2.
-		 */
-		if (!asus->wmi_event_queue || value != WMI_EVENT_VALUE_ATK)
-			return;
-	}
+	int code = asus_wmi_get_event_code(value);
 
-	pr_warn("Failed to process event queue, last code: 0x%x\n", code);
-}
-
-static int asus_wmi_notify_queue_flush(struct asus_wmi *asus)
-{
-	int code;
-	int i;
-
-	for (i = 0; i < WMI_EVENT_QUEUE_SIZE + 1; i++) {
-		code = asus_wmi_get_event_code(WMI_EVENT_VALUE_ATK);
-		if (code < 0) {
-			pr_warn("Failed to get event during flush: %d\n", code);
-			return code;
-		}
-
-		if (code == WMI_EVENT_QUEUE_END || code == WMI_EVENT_MASK)
-			return 0;
+	if (code < 0) {
+		pr_warn("Failed to get notify code: %d\n", code);
+		return;
 	}
 
-	pr_warn("Failed to flush event queue\n");
-	return -EIO;
+	asus_wmi_handle_event_code(code, asus);
 }
 
 /* Sysfs **********************************************************************/
@@ -4302,23 +4258,6 @@ static int asus_wmi_platform_init(struct asus_wmi *asus)
 		asus->dsts_id = ASUS_WMI_METHODID_DSTS;
 	}
 
-	/*
-	 * Some devices can have multiple event codes stored in a queue before
-	 * the module load if it was unloaded intermittently after calling
-	 * the INIT method (enables event handling). The WMI notify handler is
-	 * expected to retrieve all event codes until a retrieved code equals
-	 * queue end marker (One or Ones). Old codes are flushed from the queue
-	 * upon module load. Not enabling this when it should be has minimal
-	 * visible impact so fall back if anything goes wrong.
-	 */
-	wmi_uid = wmi_get_acpi_device_uid(asus->driver->event_guid);
-	if (wmi_uid && !strcmp(wmi_uid, ASUS_ACPI_UID_ATK)) {
-		dev_info(dev, "Detected ATK, enable event queue\n");
-
-		if (!asus_wmi_notify_queue_flush(asus))
-			asus->wmi_event_queue = true;
-	}
-
 	/* CWAP allow to define the behavior of the Fn+F2 key,
 	 * this method doesn't seems to be present on Eee PCs */
 	if (asus->driver->quirks->wapf >= 0)