acpi: Post/pre device suspend/resume eventhandlers

These eventhandlers are called after suspending the device tree and
before resuming it. This is useful for PMC (power management controller)
drivers.

Reviewed by:	olce
Approved by:	olce
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D48735

2 files changed, 5 insertions, 1 deletions

diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
index 6944adafed8e..60a2dba91b05 100644
--- a/sys/dev/acpica/acpi.c
+++ b/sys/dev/acpica/acpi.c
@@ -3634,6 +3634,7 @@ acpi_EnterSleepState(struct acpi_softc *sc, enum power_stype stype)
         device_printf(sc->acpi_dev, "device_suspend failed\n");
         goto backout;
     }
+    EVENTHANDLER_INVOKE(acpi_post_dev_suspend, stype);
     slp_state |= ACPI_SS_DEV_SUSPEND;
 
     if (stype != POWER_STYPE_SUSPEND_TO_IDLE) {
@@ -3683,6 +3684,7 @@ backout:
 	slp_state &= ~ACPI_SS_GPE_SET;
     }
     if ((slp_state & ACPI_SS_DEV_SUSPEND) != 0) {
+	EVENTHANDLER_INVOKE(acpi_pre_dev_resume, stype);
 	DEVICE_RESUME(root_bus);
 	slp_state &= ~ACPI_SS_DEV_SUSPEND;
     }
diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h
index 0ffb9f7c7cc3..eea54178060f 100644
--- a/sys/dev/acpica/acpivar.h
+++ b/sys/dev/acpica/acpivar.h
@@ -482,12 +482,14 @@ UINT32		acpi_event_sleep_button_wake(void *context);
 #define ACPI_EVENT_PRI_DEFAULT    10000
 #define ACPI_EVENT_PRI_LAST       20000
 
-typedef void (*acpi_event_handler_t)(void *, int);
+typedef void (*acpi_event_handler_t)(void *, enum power_stype);
 
 EVENTHANDLER_DECLARE(acpi_sleep_event, acpi_event_handler_t);
 EVENTHANDLER_DECLARE(acpi_wakeup_event, acpi_event_handler_t);
 EVENTHANDLER_DECLARE(acpi_acad_event, acpi_event_handler_t);
 EVENTHANDLER_DECLARE(acpi_video_event, acpi_event_handler_t);
+EVENTHANDLER_DECLARE(acpi_post_dev_suspend, acpi_event_handler_t);
+EVENTHANDLER_DECLARE(acpi_pre_dev_resume, acpi_event_handler_t);
 
 /* Device power control. */
 ACPI_STATUS	acpi_pwr_wake_enable(ACPI_HANDLE consumer, int enable);