sony-laptop: notify userspace of GFX switch position changes

Some Vaios come with both integrated and discrete graphics, plus a
switch for choosing one of the two. When the switch position is changed,
a notification is generated.

Signed-off-by: Marco Chiappero <marco@absence.it>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 615ab06b6cd3319f266d8c995c3465f4897acc01..4f42e5661bf54ce8cf930297aa4621f9fbf38460 100644 (file)
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1174,7 +1174,8 @@ static int sony_nc_hotkeys_decode(u32 event, unsigned int handle)
  */
 enum event_types {
        HOTKEY = 1,
-       KILLSWITCH
+       KILLSWITCH,
+       GFX_SWITCH
 };
 static void sony_nc_notify(struct acpi_device *device, u32 event)
 {
@@ -1230,6 +1231,24 @@ static void sony_nc_notify(struct acpi_device *device, u32 event)
 
                        break;
 
+               case 0x0128:
+               case 0x0146:
+                       /* Hybrid GFX switching */
+                       sony_call_snc_handle(handle, 0x0000, &result);
+                       dprintk("GFX switch event received (reason: %s)\n",
+                                       (result & 0x01) ?
+                                       "switch change" : "unknown");
+
+                       /* verify the switch state
+                        * 1: discrete GFX
+                        * 0: integrated GFX
+                        */
+                       sony_call_snc_handle(handle, 0x0100, &result);
+
+                       ev_type = GFX_SWITCH;
+                       real_ev = result & 0xff;
+                       break;
+
                default:
                        dprintk("Unknown event 0x%x for handle 0x%x\n",
                                        event, handle);