[PATCH 19/19] sony-laptop: notify userspace of GFX switch position changes

[Mattia Dongili <malattia@linux.it>]

From: Marco Chiappero <marco@absence.it>

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>
---
 drivers/platform/x86/sony-laptop.c |   21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 7f56f8d..48a1ca6 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -1223,7 +1223,8 @@ enum event_types {
 	HOTKEY = 1,
 	KILLSWITCH,
 	HDDSHOCK,
-	ALS
+	ALS,
+	GFX_SWITCH
 };
 static void sony_nc_notify(struct acpi_device *device, u32 event)
 {
@@ -1310,6 +1311,24 @@ static void sony_nc_notify(struct acpi_device *device, u32 event)
 			ev_type = ALS;
 			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);
-- 
1.7.10