sony-laptop: Invoke _INI for SNC devices that provide it

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 43315be..5300cad 100644 (file)
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -864,6 +864,15 @@ static int sony_nc_add(struct acpi_device *device)
 
        sony_nc_acpi_handle = device->handle;
 
+       /* read device status */
+       result = acpi_bus_get_status(device);
+       /* bail IFF the above call was successful and the device is not present */
+       if (!result && !device->status.present) {
+               dprintk("Device not present\n");
+               result = -ENODEV;
+               goto outwalk;
+       }
+
        if (debug) {
                status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_nc_acpi_handle,
                                             1, sony_walk_callback, NULL, NULL);
@@ -874,6 +883,15 @@ static int sony_nc_add(struct acpi_device *device)
                }
        }
 
+       /* try to _INI the device if such method exists (ACPI spec 3.0-6.5.1
+        * should be respected as we already checked for the device presence above */
+       if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, METHOD_NAME__INI, &handle))) {
+               dprintk("Invoking _INI\n");
+               if (ACPI_FAILURE(acpi_evaluate_object(sony_nc_acpi_handle, METHOD_NAME__INI,
+                                               NULL, NULL)))
+                       dprintk("_INI Method failed\n");
+       }
+
        /* setup input devices and helper fifo */
        result = sony_laptop_setup_input();
        if (result) {
@@ -886,7 +904,7 @@ static int sony_nc_add(struct acpi_device *device)
                                             ACPI_DEVICE_NOTIFY,
                                             sony_acpi_notify, NULL);
        if (ACPI_FAILURE(status)) {
-               printk(KERN_WARNING DRV_PFX "unable to install notify handler\n");
+               printk(KERN_WARNING DRV_PFX "unable to install notify handler (%u)\n", status);
                result = -ENODEV;
                goto outinput;
        }