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MPSAFE locking

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* Serialize notifying the user in acpi_lid_notify_status_changed().  This
  way multiple lid events occur in order.
* Add an initialization pass to get the lid status at boot-time.  This
  pass does not notify any apps but gets the initial status.
This commit is contained in:
Nate Lawson 2004-08-13 06:21:55 +00:00
parent f4b7de154d
commit 2014ed9841
1 changed files with 31 additions and 13 deletions
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44
sys/dev/acpica/acpi_lid.c
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@ -50,6 +50,8 @@ struct acpi_lid_softc {
int lid_status; /* open or closed */
};
ACPI_SERIAL_DECL(lid, "ACPI lid");
static int acpi_lid_probe(device_t dev);
static int acpi_lid_attach(device_t dev);
static int acpi_lid_suspend(device_t dev);
@ -101,6 +103,7 @@ acpi_lid_attach(device_t dev)
sc = device_get_softc(dev);
sc->lid_dev = dev;
sc->lid_handle = acpi_get_handle(dev);
sc->lid_status = -1;
/*
* If a system does not get lid events, it may make sense to change
@ -114,7 +117,11 @@ acpi_lid_attach(device_t dev)
acpi_wake_init(dev, ACPI_GPE_TYPE_WAKE_RUN);
acpi_wake_set_enable(dev, 1);
return_VALUE (0);
/* Attempt to get the initial lid switch state. */
AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_lid_notify_status_changed,
sc);
return (0);
}
static int
@ -135,6 +142,7 @@ acpi_lid_notify_status_changed(void *arg)
struct acpi_lid_softc *sc;
struct acpi_softc *acpi_sc;
ACPI_STATUS status;
int lid_status, old_status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
@ -145,24 +153,34 @@ acpi_lid_notify_status_changed(void *arg)
* Zero: The lid is closed
* Non-zero: The lid is open
*/
status = acpi_GetInteger(sc->lid_handle, "_LID", &sc->lid_status);
status = acpi_GetInteger(sc->lid_handle, "_LID", &lid_status);
if (ACPI_FAILURE(status))
return_VOID;
acpi_sc = acpi_device_get_parent_softc(sc->lid_dev);
if (acpi_sc == NULL)
return_VOID;
ACPI_SERIAL_BEGIN(lid);
if (lid_status != sc->lid_status) {
old_status = sc->lid_status;
sc->lid_status = lid_status;
ACPI_VPRINT(sc->lid_dev, acpi_sc, "Lid %s\n",
sc->lid_status ? "opened" : "closed");
/* If this is the initialization pass, skip the notification. */
if (old_status == -1)
goto out;
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
EVENTHANDLER_INVOKE(acpi_wakeup_event, acpi_sc->acpi_lid_switch_sx);
/* Since the status has changed, notify the system. */
acpi_sc = acpi_device_get_parent_softc(sc->lid_dev);
if (acpi_sc == NULL)
goto out;
ACPI_VPRINT(sc->lid_dev, acpi_sc, "Lid %s\n",
lid_status ? "opened" : "closed");
acpi_UserNotify("Lid", sc->lid_handle, lid_status);
if (lid_status == 0)
EVENTHANDLER_INVOKE(acpi_sleep_event, acpi_sc->acpi_lid_switch_sx);
else
EVENTHANDLER_INVOKE(acpi_wakeup_event, acpi_sc->acpi_lid_switch_sx);
}
out:
ACPI_SERIAL_END(lid);
return_VOID;
}