staging: line6: Call *_disconnect() via pointer

Which *_disconnect() to call on disconnect is known at initialization.
Add a function pointer to the `usb_line6' struct and use to call into
the appropriate logic instead of evaluating the conditional logic.
Signed-off-by: Chris Rorvick <chris@rorvick.com>
Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

drivers/staging/line6/driver.c

@@ -1017,48 +1017,7 @@ static void line6_disconnect(struct usb_interface *interface)
 			dev_err(line6->ifcdev,
 				"driver bug: inconsistent usb device\n");
 
-		switch (line6->type) {
-		case LINE6_BASSPODXT:
-		case LINE6_BASSPODXTLIVE:
-		case LINE6_BASSPODXTPRO:
-		case LINE6_POCKETPOD:
-		case LINE6_PODXT:
-		case LINE6_PODXTPRO:
-			line6_pod_disconnect(interface);
-			break;
-
-		case LINE6_PODHD300:
-		case LINE6_PODHD400:
-		case LINE6_PODHD500_0:
-		case LINE6_PODHD500_1:
-			line6_podhd_disconnect(interface);
-			break;
-
-		case LINE6_PODXTLIVE_POD:
-			line6_pod_disconnect(interface);
-			break;
-
-		case LINE6_PODXTLIVE_VARIAX:
-			line6_variax_disconnect(interface);
-			break;
-
-		case LINE6_VARIAX:
-			line6_variax_disconnect(interface);
-			break;
-
-		case LINE6_PODSTUDIO_GX:
-		case LINE6_PODSTUDIO_UX1:
-		case LINE6_PODSTUDIO_UX2:
-		case LINE6_TONEPORT_GX:
-		case LINE6_TONEPORT_UX1:
-		case LINE6_TONEPORT_UX2:
-		case LINE6_GUITARPORT:
-			line6_toneport_disconnect(interface);
-			break;
-
-		default:
-			MISSING_CASE;
-		}
+		line6->disconnect(interface);
 
 		dev_info(&interface->dev, "Line6 %s now disconnected\n",
 			 line6->properties->name);

drivers/staging/line6/driver.h

@@ -196,6 +196,7 @@ struct usb_line6 {
 	int message_length;
 
 	void (*process_message)(struct usb_line6 *);
+	void (*disconnect)(struct usb_interface *);
 };
 
 extern char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1,

drivers/staging/line6/pod.c

@@ -360,6 +360,7 @@ static int pod_try_init(struct usb_interface *interface,
 	struct usb_line6_pod *pod = (struct usb_line6_pod *) line6;
 
 	line6->process_message = line6_pod_process_message;
+	line6->disconnect = line6_pod_disconnect;
 
 	init_timer(&pod->startup_timer);
 	INIT_WORK(&pod->startup_work, pod_startup4);

drivers/staging/line6/podhd.c

@@ -98,6 +98,8 @@ static int podhd_try_init(struct usb_interface *interface,
 	if ((interface == NULL) || (podhd == NULL))
 		return -ENODEV;
 
+	line6->disconnect = line6_podhd_disconnect;
+
 	/* initialize audio system: */
 	err = line6_init_audio(line6);
 	if (err < 0)

drivers/staging/line6/toneport.c

@@ -347,6 +347,8 @@ static int toneport_try_init(struct usb_interface *interface,
 	if ((interface == NULL) || (toneport == NULL))
 		return -ENODEV;
 
+	line6->disconnect = line6_toneport_disconnect;
+
 	/* initialize audio system: */
 	err = line6_init_audio(line6);
 	if (err < 0)

drivers/staging/line6/variax.c

@@ -181,6 +181,7 @@ static int variax_try_init(struct usb_interface *interface,
 	int err;
 
 	line6->process_message = line6_variax_process_message;
+	line6->disconnect = line6_variax_disconnect;
 
 	init_timer(&variax->startup_timer1);
 	init_timer(&variax->startup_timer2);