Ignore power button and sleep button events for 5 sec.

Wakeup event is generated by power button and/or sleep button on some
laptops but this also generates SCI interrupt, and shutdown the system
as result.  So this kind of mechanism is introduced so that acpi
driver ignore given events for certain period.

1 files changed, 23 insertions, 2 deletions

diff --git a/sys/dev/acpi/acpi.c b/sys/dev/acpi/acpi.c
index a8b84a3..afd39a6 100644
--- a/sys/dev/acpi/acpi.c
+++ b/sys/dev/acpi/acpi.c
@@ -153,6 +153,7 @@ static void acpi_process_event(acpi_softc_t *sc,
 			       u_int32_t status_0, u_int32_t status_1);
 static void acpi_intr(void *data);
 static void acpi_enable_events(acpi_softc_t *sc);
+static void acpi_clear_ignore_events(void *arg);
 
 /* New-bus dependent code */
 static acpi_softc_t *acpi_get_softc(dev_t dev);
@@ -834,6 +835,10 @@ acpi_trans_sleeping_state(acpi_softc_t *sc, u_int8_t state)
 		val_a = ACPI_PM1_WAK_STS;
 		val_b = ACPI_PM1_WAK_STS;
 		acpi_io_pm1_status(sc, ACPI_REGISTERS_OUTPUT, &val_a, &val_b);
+
+		/* ignore power button and sleep button events for 5 sec. */
+		sc->ignore_events = ACPI_PM1_PWRBTN_EN | ACPI_PM1_SLPBTN_EN;
+		timeout(acpi_clear_ignore_events, (caddr_t)sc, hz * 5);
 	}
 
 	acpi_io_pm1_control(sc, ACPI_REGISTERS_INPUT, &val_a, &val_b);
@@ -1001,11 +1006,19 @@ acpi_process_event(acpi_softc_t *sc, u_int32_t status_a, u_int32_t status_b,
 {
 
 	if (status_a & ACPI_PM1_PWRBTN_EN || status_b & ACPI_PM1_PWRBTN_EN) {
-		acpi_set_sleeping_state(sc, ACPI_S_STATE_S5);
+		if (sc->ignore_events & ACPI_PM1_PWRBTN_EN) {
+			ACPI_DEBUGPRINT("PWRBTN event ingnored\n");
+		} else {
+			acpi_set_sleeping_state(sc, ACPI_S_STATE_S5);
+		}
 	}
 
 	if (status_a & ACPI_PM1_SLPBTN_EN || status_b & ACPI_PM1_SLPBTN_EN) {
-		acpi_set_sleeping_state(sc, ACPI_S_STATE_S1);
+		if (sc->ignore_events & ACPI_PM1_SLPBTN_EN) {
+			ACPI_DEBUGPRINT("SLPBTN event ingnored\n");
+		} else {
+			acpi_set_sleeping_state(sc, ACPI_S_STATE_S1);
+		}
 	}
 }
 
@@ -1166,6 +1179,14 @@ acpi_enable_events(acpi_softc_t *sc)
 	acpi_io_pm_timer(sc, ACPI_REGISTERS_INPUT,  &status_a);
 }
 
+static void
+acpi_clear_ignore_events(void *arg)
+{
+
+	((acpi_softc_t *)arg)->ignore_events = 0;
+	ACPI_DEBUGPRINT("ignore events cleared\n");
+}
+
 /*
  * Character device stuff
  */