git: 1a3ee6002f3e - main - acpi_lid: Remove duplicate events

The branch main has been updated by mav:

URL: https://cgit.FreeBSD.org/src/commit/?id=1a3ee6002f3e008e0bc29d04c976285434503e19

commit 1a3ee6002f3e008e0bc29d04c976285434503e19
Author:     Alexander Motin <mav@FreeBSD.org>
AuthorDate: 2023-12-24 02:33:51 +0000
Commit:     Alexander Motin <mav@FreeBSD.org>
CommitDate: 2023-12-24 02:33:51 +0000

    acpi_lid: Remove duplicate events
    
    Remove extra acpi_UserNotify() call per event.  Filter duplicate
    notifications received from ACPI without actual status change.
    
    Without this on my Dell XPS 13 9310 I saw 4 devd events for either
    open or close, now only one.
    
    MFC after:      1 month
---
 sys/dev/acpica/acpi_lid.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/sys/dev/acpica/acpi_lid.c b/sys/dev/acpica/acpi_lid.c
index 44730879c31e..142791f7282a 100644
--- a/sys/dev/acpica/acpi_lid.c
+++ b/sys/dev/acpica/acpi_lid.c
@@ -91,7 +91,7 @@ static driver_t acpi_lid_driver = {
 DRIVER_MODULE(acpi_lid, acpi, acpi_lid_driver, 0, 0);
 MODULE_DEPEND(acpi_lid, acpi, 1, 1, 1);
 
-static void
+static int
 acpi_lid_status_update(struct acpi_lid_softc *sc)
 {
 	ACPI_STATUS status;
@@ -107,9 +107,12 @@ acpi_lid_status_update(struct acpi_lid_softc *sc)
 	status = acpi_GetInteger(sc->lid_handle, "_LID", &lid_status);
 	if (ACPI_FAILURE(status))
 		lid_status = 1;		/* assume lid is opened */
+	else
+		lid_status = (lid_status != 0); /* range check value */
 
-	/* range check value */
-	sc->lid_status = lid_status ? 1 : 0;
+	if (sc->lid_status == lid_status)
+		return (EALREADY);
+	sc->lid_status = lid_status;
 
 	/* Send notification via devd */
 	acpi_UserNotify("Lid", sc->lid_handle, sc->lid_status);
@@ -119,6 +122,7 @@ acpi_lid_status_update(struct acpi_lid_softc *sc)
 	evdev_push_sw(sc->lid_evdev, SW_LID, lid_status ? 0 : 1);
 	evdev_sync(sc->lid_evdev);
 #endif
+	return (0);
 }
 
 static int
@@ -146,6 +150,7 @@ acpi_lid_attach(device_t dev)
     sc = device_get_softc(dev);
     sc->lid_dev = dev;
     acpi_lid_handle = sc->lid_handle = acpi_get_handle(dev);
+    sc->lid_status = -1;
 
 #ifdef EVDEV_SUPPORT
     /* Register evdev device before initial status update */
@@ -219,7 +224,8 @@ acpi_lid_notify_status_changed(void *arg)
     ACPI_SERIAL_BEGIN(lid);
 
     /* Update lid status, if any */
-    acpi_lid_status_update(sc);
+    if (acpi_lid_status_update(sc) != 0)
+	goto out;
 
     acpi_sc = acpi_device_get_parent_softc(sc->lid_dev);
     if (acpi_sc == NULL)
@@ -228,8 +234,6 @@ acpi_lid_notify_status_changed(void *arg)
     ACPI_VPRINT(sc->lid_dev, acpi_sc, "Lid %s\n",
 		sc->lid_status ? "opened" : "closed");
 
-    acpi_UserNotify("Lid", sc->lid_handle, sc->lid_status);
-
     if (sc->lid_status == 0)
 	EVENTHANDLER_INVOKE(acpi_sleep_event, acpi_sc->acpi_lid_switch_sx);
     else