staging: line6: Call *_process_message() via pointer

Which *_process_message() function (if any) to call when data is
received 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 for each message.

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

@@ -537,37 +537,8 @@ static void line6_data_received(struct urb *urb)
 		line6->message_length = done;
 		line6_midi_receive(line6, line6->buffer_message, done);
 
-		switch (line6->type) {
-		case LINE6_BASSPODXT:
-		case LINE6_BASSPODXTLIVE:
-		case LINE6_BASSPODXTPRO:
-		case LINE6_PODXT:
-		case LINE6_PODXTPRO:
-		case LINE6_POCKETPOD:
-			line6_pod_process_message(line6);
-			break;
-
-		case LINE6_PODHD300:
-		case LINE6_PODHD400:
-		case LINE6_PODHD500_0:
-		case LINE6_PODHD500_1:
-			break; /* let userspace handle MIDI */
-
-		case LINE6_PODXTLIVE_POD:
-			line6_pod_process_message(line6);
-			break;
-
-		case LINE6_PODXTLIVE_VARIAX:
-			line6_variax_process_message(line6);
-			break;
-
-		case LINE6_VARIAX:
-			line6_variax_process_message(line6);
-			break;
-
-		default:
-			MISSING_CASE;
-		}
+		if (line6->process_message)
+			line6->process_message(line6);
 	}
 
 	line6_start_listen(line6);

drivers/staging/line6/driver.h

@@ -194,6 +194,8 @@ struct usb_line6 {
 		 Length of message to be processed.
 	*/
 	int message_length;
+
+	void (*process_message)(struct usb_line6 *);
 };
 
 extern char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1,

drivers/staging/line6/pod.c

@@ -131,7 +131,7 @@ static char *pod_alloc_sysex_buffer(struct usb_line6_pod *pod, int code,
 /*
 	Process a completely received message.
 */
-void line6_pod_process_message(struct usb_line6 *line6)
+static void line6_pod_process_message(struct usb_line6 *line6)
 {
 	struct usb_line6_pod *pod = (struct usb_line6_pod *) line6;
 	const unsigned char *buf = pod->line6.buffer_message;
@@ -359,6 +359,8 @@ static int pod_try_init(struct usb_interface *interface,
 	int err;
 	struct usb_line6_pod *pod = (struct usb_line6_pod *) line6;
 
+	line6->process_message = line6_pod_process_message;
+
 	init_timer(&pod->startup_timer);
 	INIT_WORK(&pod->startup_work, pod_startup4);
 

drivers/staging/line6/pod.h

@@ -89,6 +89,5 @@ struct usb_line6_pod {
 extern void line6_pod_disconnect(struct usb_interface *interface);
 extern int line6_pod_init(struct usb_interface *interface,
 			  struct usb_line6 *line6);
-extern void line6_pod_process_message(struct usb_line6 *line6);
 
 #endif

drivers/staging/line6/variax.c

@@ -130,7 +130,7 @@ static void variax_startup6(struct work_struct *work)
 /*
 	Process a completely received message.
 */
-void line6_variax_process_message(struct usb_line6 *line6)
+static void line6_variax_process_message(struct usb_line6 *line6)
 {
 	struct usb_line6_variax *variax = (struct usb_line6_variax *) line6;
 	const unsigned char *buf = variax->line6.buffer_message;
@@ -180,6 +180,8 @@ static int variax_try_init(struct usb_interface *interface,
 	struct usb_line6_variax *variax = (struct usb_line6_variax *) line6;
 	int err;
 
+	line6->process_message = line6_variax_process_message;
+
 	init_timer(&variax->startup_timer1);
 	init_timer(&variax->startup_timer2);
 	INIT_WORK(&variax->startup_work, variax_startup6);

drivers/staging/line6/variax.h

@@ -67,6 +67,5 @@ struct usb_line6_variax {
 extern void line6_variax_disconnect(struct usb_interface *interface);
 extern int line6_variax_init(struct usb_interface *interface,
 			     struct usb_line6 *line6);
-extern void line6_variax_process_message(struct usb_line6 *line6);
 
 #endif