[media] stk1160: Add support for S-Video input

In order to fully replace easycap driver with stk1160,
it's also necessary to add S-Video support.
A similar patch backported for v3.2 kernel has been
tested by three different users.
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/stk1160/stk1160-core.c

@@ -100,12 +100,21 @@ int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
 
 void stk1160_select_input(struct stk1160 *dev)
 {
+	int route;
 	static const u8 gctrl[] = {
-		0x98, 0x90, 0x88, 0x80
+		0x98, 0x90, 0x88, 0x80, 0x98
 	};
 
-	if (dev->ctl_input < ARRAY_SIZE(gctrl))
+	if (dev->ctl_input == STK1160_SVIDEO_INPUT)
+		route = SAA7115_SVIDEO3;
+	else
+		route = SAA7115_COMPOSITE0;
+
+	if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
+		v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
+				route, 0, 0);
 		stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
+	}
 }
 
 /* TODO: We should break this into pieces */
@@ -351,8 +360,6 @@ static int stk1160_probe(struct usb_interface *interface,
 
 	/* i2c reset saa711x */
 	v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
-	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
-				0, 0, 0);
 	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
 
 	/* reset stk1160 to default values */

drivers/media/usb/stk1160/stk1160-v4l.c

@@ -419,7 +419,12 @@ static int vidioc_enum_input(struct file *file, void *priv,
 	if (i->index > STK1160_MAX_INPUT)
 		return -EINVAL;
 
-	sprintf(i->name, "Composite%d", i->index);
+	/* S-Video special handling */
+	if (i->index == STK1160_SVIDEO_INPUT)
+		sprintf(i->name, "S-Video");
+	else
+		sprintf(i->name, "Composite%d", i->index);
+
 	i->type = V4L2_INPUT_TYPE_CAMERA;
 	i->std = dev->vdev.tvnorms;
 	return 0;

drivers/media/usb/stk1160/stk1160.h

@@ -46,7 +46,8 @@
 
 #define STK1160_MIN_PKT_SIZE 3072
 
-#define STK1160_MAX_INPUT 3
+#define STK1160_MAX_INPUT 4
+#define STK1160_SVIDEO_INPUT 4
 
 #define STK1160_I2C_TIMEOUT 100