Add device(power/sleep button and lid) wake function from sleeping state.

This is required for some Thinkpad (and maybe VAIO) machines to wake
the system up from sleep.

Currently partially implemented, more complete implementation will come later.

sys/dev/acpica/acpi.c

@@ -1328,6 +1328,9 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
 	    break;
 	}
 
+	sc->acpi_sstate = state;
+	sc->acpi_sleep_disabled = 1;
+
 	/*
 	 * Inform all devices that we are going to sleep.
 	 */
@@ -1349,14 +1352,13 @@ acpi_SetSleepState(struct acpi_softc *sc, int state)
 	    break;
 	}
 
-	sc->acpi_sstate = state;
-	sc->acpi_sleep_disabled = 1;
-
 	if (state != ACPI_STATE_S1) {
 	    acpi_sleep_machdep(sc, state);
 
-	    /* AcpiEnterSleepState() maybe incompleted, unlock here. */ 
-	    AcpiUtReleaseMutex(ACPI_MTX_HARDWARE);
+	    /* AcpiEnterSleepState() maybe incompleted, unlock here if locked. */
+	    if (AcpiGbl_AcpiMutexInfo[ACPI_MTX_HARDWARE].OwnerId != ACPI_MUTEX_NOT_ACQUIRED) {
+		AcpiUtReleaseMutex(ACPI_MTX_HARDWARE);
+	    }
 
 	    /* Re-enable ACPI hardware on wakeup from sleep state 4. */
 	    if (state == ACPI_STATE_S4) {
@@ -1612,6 +1614,127 @@ acpi_disabled(char *subsys)
     return(0);
 }
 
+/*
+ * Device wake capability enable/disable.
+ */
+void
+acpi_device_enable_wake_capability(ACPI_HANDLE h, int enable)
+{
+    ACPI_OBJECT_LIST		ArgList;
+    ACPI_OBJECT			Arg;
+
+    /*
+     * TBD: All Power Resources referenced by elements 2 through N
+     *      of the _PRW object are put into the ON state.
+     */
+
+    /*
+     * enable/disable device wake function.
+     */
+
+    ArgList.Count = 1;
+    ArgList.Pointer = &Arg;
+
+    Arg.Type = ACPI_TYPE_INTEGER;
+    Arg.Integer.Value = enable;
+
+    (void)AcpiEvaluateObject(h, "_PSW", &ArgList, NULL);
+}
+
+void
+acpi_device_enable_wake_event(ACPI_HANDLE h)
+{
+    struct acpi_softc		*sc;
+    ACPI_STATUS			status;
+    ACPI_BUFFER			prw_buffer;
+    ACPI_OBJECT			*res;
+
+    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
+
+    if ((sc = devclass_get_softc(acpi_devclass, 0)) == NULL) {
+	return;
+    }
+
+    /*
+     * _PRW object is only required for devices that have the ability
+     * to wake the system from a system sleeping state.
+     */
+    prw_buffer.Length = ACPI_ALLOCATE_BUFFER;
+    status = AcpiEvaluateObject(h, "_PRW", NULL, &prw_buffer);
+    if (ACPI_FAILURE(status)) {
+	return;
+    }
+
+    res = (ACPI_OBJECT *)prw_buffer.Pointer;
+    if (res == NULL) {
+	return;
+    }
+
+    if ((res->Type != ACPI_TYPE_PACKAGE) || (res->Package.Count < 2)) {
+	goto out;
+    }
+
+    /*
+     * The element 1 of the _PRW object:
+     * The lowest power system sleeping state that can be entered
+     * while still providing wake functionality.
+     * The sleeping state being entered must be greater or equal to
+     * the power state declared in element 1 of the _PRW object.
+     */
+    if (res->Package.Elements[1].Type != ACPI_TYPE_INTEGER) {
+	goto out;
+    }
+
+    if (sc->acpi_sstate > res->Package.Elements[1].Integer.Value) {
+	goto out;
+    }
+
+    /*
+     * The element 0 of the _PRW object:
+     */
+    switch(res->Package.Elements[0].Type) {
+    case ACPI_TYPE_INTEGER:
+	/* 
+	 * If the data type of this package element is numeric, then this
+	 * _PRW package element is the bit index in the GPEx_EN, in the
+	 * GPE blocks described in the FADT, of the enable bit that is
+	 * enabled for the wake event.
+	 */
+
+	status = AcpiEnableEvent(res->Package.Elements[0].Integer.Value,
+				 ACPI_EVENT_GPE, ACPI_EVENT_WAKE_ENABLE);
+	if (ACPI_FAILURE(status))
+            printf("%s: EnableEvent Failed\n", __func__);
+	break;
+
+    case ACPI_TYPE_PACKAGE:
+	/* XXX TBD */
+
+	/*
+	 * If the data type of this package element is a package, then this
+	 * _PRW package element is itself a package containing two
+	 * elements. The first is an object reference to the GPE Block
+	 * device that contains the GPE that will be triggered by the wake
+	 * event. The second element is numeric and it contains the bit
+	 * index in the GPEx_EN, in the GPE Block referenced by the
+	 * first element in the package, of the enable bit that is enabled for
+	 * the wake event.
+	 * For example, if this field is a package then it is of the form:
+	 * Package() {\_SB.PCI0.ISA.GPE, 2}
+	 */
+
+	break;
+
+    default:
+	break;
+    }
+
+out:
+    if (prw_buffer.Pointer != NULL)
+	AcpiOsFree(prw_buffer.Pointer);
+    return;
+}
+
 /*
  * Control interface.
  *

sys/dev/acpica/acpi_button.c

@@ -53,6 +53,8 @@ struct acpi_button_softc {
 
 static int	acpi_button_probe(device_t dev);
 static int	acpi_button_attach(device_t dev);
+static int	acpi_button_suspend(device_t dev);
+static int	acpi_button_resume(device_t dev);
 static void 	acpi_button_notify_handler(ACPI_HANDLE h,UINT32 notify, void *context);
 static void	acpi_button_notify_pressed_for_sleep(void *arg);
 static void	acpi_button_notify_pressed_for_wakeup(void *arg);
@@ -61,6 +63,8 @@ static device_method_t acpi_button_methods[] = {
     /* Device interface */
     DEVMETHOD(device_probe,	acpi_button_probe),
     DEVMETHOD(device_attach,	acpi_button_attach),
+    DEVMETHOD(device_suspend,	acpi_button_suspend),
+    DEVMETHOD(device_resume,	acpi_button_resume),
 
     {0, 0}
 };
@@ -114,9 +118,27 @@ acpi_button_attach(device_t dev)
 	device_printf(sc->button_dev, "couldn't install Notify handler - %s\n", AcpiFormatException(status));
 	return_VALUE(ENXIO);
     }
+    acpi_device_enable_wake_capability(sc->button_handle, 1);
     return_VALUE(0);
 }
 
+static int
+acpi_button_suspend(device_t dev)
+{
+    struct acpi_button_softc	*sc;
+
+    sc = device_get_softc(dev);
+    acpi_device_enable_wake_event(sc->button_handle);
+    return (0);
+}
+
+static int
+acpi_button_resume(device_t dev)
+{
+
+    return (0);
+}
+
 static void
 acpi_button_notify_pressed_for_sleep(void *arg)
 {

sys/dev/acpica/acpi_lid.c

@@ -55,6 +55,8 @@ struct acpi_lid_softc {
 
 static int	acpi_lid_probe(device_t dev);
 static int	acpi_lid_attach(device_t dev);
+static int	acpi_lid_suspend(device_t dev);
+static int	acpi_lid_resume(device_t dev);
 static void	acpi_lid_notify_status_changed(void *arg);
 static void 	acpi_lid_notify_handler(ACPI_HANDLE h,UINT32 notify, void *context);
 
@@ -62,6 +64,8 @@ static device_method_t acpi_lid_methods[] = {
     /* Device interface */
     DEVMETHOD(device_probe,	acpi_lid_probe),
     DEVMETHOD(device_attach,	acpi_lid_attach),
+    DEVMETHOD(device_suspend,	acpi_lid_suspend),
+    DEVMETHOD(device_resume,	acpi_lid_resume),
 
     {0, 0}
 };
@@ -102,9 +106,26 @@ acpi_lid_attach(device_t dev)
      * Install notification handler
      */
     AcpiInstallNotifyHandler(sc->lid_handle, ACPI_DEVICE_NOTIFY, acpi_lid_notify_handler, sc);
+    acpi_device_enable_wake_capability(sc->lid_handle, 1);
     return_VALUE(0);
 }
 
+static int
+acpi_lid_suspend(device_t dev)
+{
+    struct acpi_lid_softc	*sc;
+
+    sc = device_get_softc(dev);
+    acpi_device_enable_wake_event(sc->lid_handle);
+    return (0);
+}
+
+static int
+acpi_lid_resume(device_t dev)
+{
+    return (0);
+}
+
 static void
 acpi_lid_notify_status_changed(void *arg)
 {

sys/dev/acpica/acpivar.h

@@ -334,6 +334,9 @@ extern char	*acpi_name(ACPI_HANDLE handle);
 extern int	acpi_avoid(ACPI_HANDLE handle);
 extern int	acpi_disabled(char *subsys);
 
+extern void	acpi_device_enable_wake_capability(ACPI_HANDLE h, int enable);
+extern void	acpi_device_enable_wake_event(ACPI_HANDLE h);
+
 extern int	acpi_machdep_init(device_t dev);
 extern void	acpi_install_wakeup_handler(struct acpi_softc *sc);
 extern int	acpi_sleep_machdep(struct acpi_softc *sc, int state);