usb: gadget: midi: convert to new interface of f_midi

Use the new f_midi interface so that the old can be removed.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/legacy/Kconfig

@@ -287,6 +287,7 @@ config USB_MIDI_GADGET
 	depends on SND
 	select USB_LIBCOMPOSITE
 	select SND_RAWMIDI
+	select USB_F_MIDI
 	help
 	  The MIDI Gadget acts as a USB Audio device, with one MIDI
 	  input and one MIDI output. These MIDI jacks appear as

drivers/usb/gadget/legacy/gmidi.c

@@ -37,8 +37,7 @@
 
 #include "gadget_chips.h"
 
-#define USBF_MIDI_INCLUDED
-#include "f_midi.c"
+#include "u_midi.h"
 
 /*-------------------------------------------------------------------------*/
 
@@ -116,8 +115,13 @@ static struct usb_gadget_strings *dev_strings[] = {
 	NULL,
 };
 
+struct usb_function_instance *fi_midi;
+struct usb_function *f_midi;
+
 static int __exit midi_unbind(struct usb_composite_dev *dev)
 {
+	usb_put_function(f_midi);
+	usb_put_function_instance(fi_midi);
 	return 0;
 }
 
@@ -131,28 +135,54 @@ static struct usb_configuration midi_config = {
 
 static int __init midi_bind_config(struct usb_configuration *c)
 {
-	return f_midi_bind_config(c, index, id,
-				  in_ports, out_ports,
-				  buflen, qlen);
+	int status;
+
+	f_midi = usb_get_function(fi_midi);
+	if (IS_ERR(f_midi))
+		return PTR_ERR(f_midi);
+
+	status = usb_add_function(c, f_midi);
+	if (status < 0) {
+		usb_put_function(f_midi);
+		return status;
+	}
+
+	return 0;
 }
 
 static int __init midi_bind(struct usb_composite_dev *cdev)
 {
+	struct f_midi_opts *midi_opts;
 	int status;
 
+	fi_midi = usb_get_function_instance("midi");
+	if (IS_ERR(fi_midi))
+		return PTR_ERR(fi_midi);
+
+	midi_opts = container_of(fi_midi, struct f_midi_opts, func_inst);
+	midi_opts->index = index;
+	midi_opts->id = id;
+	midi_opts->in_ports = in_ports;
+	midi_opts->out_ports = out_ports;
+	midi_opts->buflen = buflen;
+	midi_opts->qlen = qlen;
+
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
-		return status;
+		goto put;
 	device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
 	device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
 	midi_config.iConfiguration = strings_dev[STRING_DESCRIPTION_IDX].id;
 
 	status = usb_add_config(cdev, &midi_config, midi_bind_config);
 	if (status < 0)
-		return status;
+		goto put;
 	usb_composite_overwrite_options(cdev, &coverwrite);
 	pr_info("%s\n", longname);
 	return 0;
+put:
+	usb_put_function_instance(fi_midi);
+	return status;
 }
 
 static __refdata struct usb_composite_driver midi_driver = {