ACPI: WMI: use .notify method instead of installing handler directly

This patch adds a .notify() method.  The presence of .notify() causes
Linux/ACPI to manage event handlers and notify handlers on our behalf,
so we don't have to install and remove them ourselves.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
CC: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 2f269e1..043b208 100644 (file)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -81,6 +81,7 @@ static struct wmi_block wmi_blocks;
 
 static int acpi_wmi_remove(struct acpi_device *device, int type);
 static int acpi_wmi_add(struct acpi_device *device);
+static void acpi_wmi_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id wmi_device_ids[] = {
        {"PNP0C14", 0},
@@ -96,6 +97,7 @@ static struct acpi_driver acpi_wmi_driver = {
        .ops = {
                .add = acpi_wmi_add,
                .remove = acpi_wmi_remove,
+               .notify = acpi_wmi_notify,
                },
 };
 
@@ -643,12 +645,11 @@ acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
        }
 }
 
-static void acpi_wmi_notify(acpi_handle handle, u32 event, void *data)
+static void acpi_wmi_notify(struct acpi_device *device, u32 event)
 {
        struct guid_block *block;
        struct wmi_block *wblock;
        struct list_head *p;
-       struct acpi_device *device = data;
 
        list_for_each(p, &wmi_blocks.list) {
                wblock = list_entry(p, struct wmi_block, list);
@@ -669,9 +670,6 @@ static void acpi_wmi_notify(acpi_handle handle, u32 event, void *data)
 
 static int acpi_wmi_remove(struct acpi_device *device, int type)
 {
-       acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-               acpi_wmi_notify);
-
        acpi_remove_address_space_handler(device->handle,
                                ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
 
@@ -683,13 +681,6 @@ static int __init acpi_wmi_add(struct acpi_device *device)
        acpi_status status;
        int result = 0;
 
-       status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
-               acpi_wmi_notify, device);
-       if (ACPI_FAILURE(status)) {
-               printk(KERN_ERR PREFIX "Error installing notify handler\n");
-               return -ENODEV;
-       }
-
        status = acpi_install_address_space_handler(device->handle,
                                                    ACPI_ADR_SPACE_EC,
                                                    &acpi_wmi_ec_space_handler,