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: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 8 insertions, 1 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index ae862f1798dc..cdfecc0a2ac6 100644
--- a/drivers/acpi/bus.c
+++ b/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);
 }
 
 /* --------------------------------------------------------------------------
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index c34b11022908..84e35d5646a1 100644
--- a/include/acpi/acpi_bus.h
+++ b/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;