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>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 615ab06b6cd3..4f42e5661bf5 100644
--- 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);