[media] em28xx: prevent registering wrong interfaces for audio-only

A few devices (em2860) use a separate interface for audio only
Audio Vendor Class USB. That interface should not be used by
Remote Controller, Analog TV or Digital TV.

Prevents initializing all non-audio extensions for the audio
only interface.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/em28xx/em28xx-dvb.c

@@ -992,6 +992,11 @@ static int em28xx_dvb_init(struct em28xx *dev)
 	int result = 0, mfe_shared = 0;
 	struct em28xx_dvb *dvb;
 
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
 	if (!dev->board.has_dvb) {
 		/* This device does not support the extension */
 		return 0;
@@ -1431,6 +1436,11 @@ static inline void prevent_sleep(struct dvb_frontend_ops *ops)
 
 static int em28xx_dvb_fini(struct em28xx *dev)
 {
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
 	if (!dev->board.has_dvb) {
 		/* This device does not support the extension */
 		return 0;

drivers/media/usb/em28xx/em28xx-input.c

@@ -673,6 +673,11 @@ static int em28xx_ir_init(struct em28xx *dev)
 	u64 rc_type;
 	u16 i2c_rc_dev_addr = 0;
 
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
 	if (dev->board.buttons)
 		em28xx_init_buttons(dev);
 
@@ -802,6 +807,11 @@ static int em28xx_ir_fini(struct em28xx *dev)
 {
 	struct em28xx_IR *ir = dev->ir;
 
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
 	em28xx_shutdown_buttons(dev);
 
 	/* skip detach on non attached boards */

drivers/media/usb/em28xx/em28xx-video.c

@@ -1877,6 +1877,11 @@ static int em28xx_v4l2_open(struct file *filp)
 */
 static int em28xx_v4l2_fini(struct em28xx *dev)
 {
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
 	if (!dev->has_video) {
 		/* This device does not support the v4l2 extension */
 		return 0;
@@ -2209,6 +2214,11 @@ static int em28xx_v4l2_init(struct em28xx *dev)
 	unsigned int maxw;
 	struct v4l2_ctrl_handler *hdl = &dev->ctrl_handler;
 
+	if (dev->is_audio_only) {
+		/* Shouldn't initialize IR for this interface */
+		return 0;
+	}
+
 	if (!dev->has_video) {
 		/* This device does not support the v4l2 extension */
 		return 0;