ACPI: allow drivers to request both device and system notify events

System notify events (0x00-0x7f) are common across all device types
and should be handled in Linux/ACPI, not in drivers.  However, some
BIOSes use system notify events in device-specific ways that require
the driver to be involved.

This patch adds a ACPI_DRIVER_ALL_NOTIFY_EVENTS driver flag.  When a
driver sets this flag and supplies a .notify method, Linux/ACPI calls
the .notify method for ALL notify events on the device, not just the
device-specific (0x80-0xff) events.
Signed-off-by: NBjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

drivers/acpi/bus.c

@@ -549,6 +549,7 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 {
 	int result = 0;
 	struct acpi_device *device = NULL;
+	struct acpi_driver *driver;
 
 	blocking_notifier_call_chain(&acpi_bus_notify_list,
 		type, (void *)handle);
@@ -629,7 +630,10 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 		break;
 	}
 
-	return;
+	driver = device->driver;
+	if (driver && driver->ops.notify &&
+	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
+		driver->ops.notify(device, type);
 }
 
 /* --------------------------------------------------------------------------

include/acpi/acpi_bus.h

@@ -114,10 +114,13 @@ struct acpi_device_ops {
 	acpi_op_notify notify;
 };
 
+#define ACPI_DRIVER_ALL_NOTIFY_EVENTS	0x1	/* system AND device events */
+
 struct acpi_driver {
 	char name[80];
 	char class[80];
 	const struct acpi_device_id *ids; /* Supported Hardware IDs */
+	unsigned int flags;
 	struct acpi_device_ops ops;
 	struct device_driver drv;
 	struct module *owner;