usb: gadget: Gadget directory cleanup - group usb functions

The drivers/usb/gadget directory contains many files.
Files which are related can be distributed into separate directories.
This patch moves the USB functions implementations into a separate directory.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 0 insertions, 986 deletions

diff --git a/drivers/usb/gadget/f_midi.c b/drivers/usb/gadget/f_midi.c
deleted file mode 100644
index 807b31c0edc3..000000000000
--- a/drivers/usb/gadget/f_midi.c
+++ /dev/null
@@ -1,986 +0,0 @@
-/*
- * f_midi.c -- USB MIDI class function driver
- *
- * Copyright (C) 2006 Thumtronics Pty Ltd.
- * Developed for Thumtronics by Grey Innovation
- * Ben Williamson <ben.williamson@greyinnovation.com>
- *
- * Rewritten for the composite framework
- *   Copyright (C) 2011 Daniel Mack <zonque@gmail.com>
- *
- * Based on drivers/usb/gadget/f_audio.c,
- *   Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
- *   Copyright (C) 2008 Analog Devices, Inc
- *
- * and drivers/usb/gadget/midi.c,
- *   Copyright (C) 2006 Thumtronics Pty Ltd.
- *   Ben Williamson <ben.williamson@greyinnovation.com>
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/device.h>
-
-#include <sound/core.h>
-#include <sound/initval.h>
-#include <sound/rawmidi.h>
-
-#include <linux/usb/ch9.h>
-#include <linux/usb/gadget.h>
-#include <linux/usb/audio.h>
-#include <linux/usb/midi.h>
-
-#include "u_f.h"
-
-MODULE_AUTHOR("Ben Williamson");
-MODULE_LICENSE("GPL v2");
-
-static const char f_midi_shortname[] = "f_midi";
-static const char f_midi_longname[] = "MIDI Gadget";
-
-/*
- * We can only handle 16 cables on one single endpoint, as cable numbers are
- * stored in 4-bit fields. And as the interface currently only holds one
- * single endpoint, this is the maximum number of ports we can allow.
- */
-#define MAX_PORTS 16
-
-/*
- * This is a gadget, and the IN/OUT naming is from the host's perspective.
- * USB -> OUT endpoint -> rawmidi
- * USB <- IN endpoint  <- rawmidi
- */
-struct gmidi_in_port {
-	struct f_midi *midi;
-	int active;
-	uint8_t cable;
-	uint8_t state;
-#define STATE_UNKNOWN	0
-#define STATE_1PARAM	1
-#define STATE_2PARAM_1	2
-#define STATE_2PARAM_2	3
-#define STATE_SYSEX_0	4
-#define STATE_SYSEX_1	5
-#define STATE_SYSEX_2	6
-	uint8_t data[2];
-};
-
-struct f_midi {
-	struct usb_function	func;
-	struct usb_gadget	*gadget;
-	struct usb_ep		*in_ep, *out_ep;
-	struct snd_card		*card;
-	struct snd_rawmidi	*rmidi;
-
-	struct snd_rawmidi_substream *in_substream[MAX_PORTS];
-	struct snd_rawmidi_substream *out_substream[MAX_PORTS];
-	struct gmidi_in_port	*in_port[MAX_PORTS];
-
-	unsigned long		out_triggered;
-	struct tasklet_struct	tasklet;
-	unsigned int in_ports;
-	unsigned int out_ports;
-	int index;
-	char *id;
-	unsigned int buflen, qlen;
-};
-
-static inline struct f_midi *func_to_midi(struct usb_function *f)
-{
-	return container_of(f, struct f_midi, func);
-}
-
-static void f_midi_transmit(struct f_midi *midi, struct usb_request *req);
-
-DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
-DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
-DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
-
-/* B.3.1  Standard AC Interface Descriptor */
-static struct usb_interface_descriptor ac_interface_desc __initdata = {
-	.bLength =		USB_DT_INTERFACE_SIZE,
-	.bDescriptorType =	USB_DT_INTERFACE,
-	/* .bInterfaceNumber =	DYNAMIC */
-	/* .bNumEndpoints =	DYNAMIC */
-	.bInterfaceClass =	USB_CLASS_AUDIO,
-	.bInterfaceSubClass =	USB_SUBCLASS_AUDIOCONTROL,
-	/* .iInterface =	DYNAMIC */
-};
-
-/* B.3.2  Class-Specific AC Interface Descriptor */
-static struct uac1_ac_header_descriptor_1 ac_header_desc __initdata = {
-	.bLength =		UAC_DT_AC_HEADER_SIZE(1),
-	.bDescriptorType =	USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype =	USB_MS_HEADER,
-	.bcdADC =		cpu_to_le16(0x0100),
-	.wTotalLength =		cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)),
-	.bInCollection =	1,
-	/* .baInterfaceNr =	DYNAMIC */
-};
-
-/* B.4.1  Standard MS Interface Descriptor */
-static struct usb_interface_descriptor ms_interface_desc __initdata = {
-	.bLength =		USB_DT_INTERFACE_SIZE,
-	.bDescriptorType =	USB_DT_INTERFACE,
-	/* .bInterfaceNumber =	DYNAMIC */
-	.bNumEndpoints =	2,
-	.bInterfaceClass =	USB_CLASS_AUDIO,
-	.bInterfaceSubClass =	USB_SUBCLASS_MIDISTREAMING,
-	/* .iInterface =	DYNAMIC */
-};
-
-/* B.4.2  Class-Specific MS Interface Descriptor */
-static struct usb_ms_header_descriptor ms_header_desc __initdata = {
-	.bLength =		USB_DT_MS_HEADER_SIZE,
-	.bDescriptorType =	USB_DT_CS_INTERFACE,
-	.bDescriptorSubtype =	USB_MS_HEADER,
-	.bcdMSC =		cpu_to_le16(0x0100),
-	/* .wTotalLength =	DYNAMIC */
-};
-
-/* B.5.1  Standard Bulk OUT Endpoint Descriptor */
-static struct usb_endpoint_descriptor bulk_out_desc = {
-	.bLength =		USB_DT_ENDPOINT_AUDIO_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-	.bEndpointAddress =	USB_DIR_OUT,
-	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
-};
-
-/* B.5.2  Class-specific MS Bulk OUT Endpoint Descriptor */
-static struct usb_ms_endpoint_descriptor_16 ms_out_desc = {
-	/* .bLength =		DYNAMIC */
-	.bDescriptorType =	USB_DT_CS_ENDPOINT,
-	.bDescriptorSubtype =	USB_MS_GENERAL,
-	/* .bNumEmbMIDIJack =	DYNAMIC */
-	/* .baAssocJackID =	DYNAMIC */
-};
-
-/* B.6.1  Standard Bulk IN Endpoint Descriptor */
-static struct usb_endpoint_descriptor bulk_in_desc = {
-	.bLength =		USB_DT_ENDPOINT_AUDIO_SIZE,
-	.bDescriptorType =	USB_DT_ENDPOINT,
-	.bEndpointAddress =	USB_DIR_IN,
-	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
-};
-
-/* B.6.2  Class-specific MS Bulk IN Endpoint Descriptor */
-static struct usb_ms_endpoint_descriptor_16 ms_in_desc = {
-	/* .bLength =		DYNAMIC */
-	.bDescriptorType =	USB_DT_CS_ENDPOINT,
-	.bDescriptorSubtype =	USB_MS_GENERAL,
-	/* .bNumEmbMIDIJack =	DYNAMIC */
-	/* .baAssocJackID =	DYNAMIC */
-};
-
-/* string IDs are assigned dynamically */
-
-#define STRING_FUNC_IDX			0
-
-static struct usb_string midi_string_defs[] = {
-	[STRING_FUNC_IDX].s = "MIDI function",
-	{  } /* end of list */
-};
-
-static struct usb_gadget_strings midi_stringtab = {
-	.language	= 0x0409,	/* en-us */
-	.strings	= midi_string_defs,
-};
-
-static struct usb_gadget_strings *midi_strings[] = {
-	&midi_stringtab,
-	NULL,
-};
-
-static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
-						    unsigned length)
-{
-	return alloc_ep_req(ep, length, length);
-}
-
-static void free_ep_req(struct usb_ep *ep, struct usb_request *req)
-{
-	kfree(req->buf);
-	usb_ep_free_request(ep, req);
-}
-
-static const uint8_t f_midi_cin_length[] = {
-	0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
-};
-
-/*
- * Receives a chunk of MIDI data.
- */
-static void f_midi_read_data(struct usb_ep *ep, int cable,
-			     uint8_t *data, int length)
-{
-	struct f_midi *midi = ep->driver_data;
-	struct snd_rawmidi_substream *substream = midi->out_substream[cable];
-
-	if (!substream)
-		/* Nobody is listening - throw it on the floor. */
-		return;
-
-	if (!test_bit(cable, &midi->out_triggered))
-		return;
-
-	snd_rawmidi_receive(substream, data, length);
-}
-
-static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
-{
-	unsigned int i;
-	u8 *buf = req->buf;
-
-	for (i = 0; i + 3 < req->actual; i += 4)
-		if (buf[i] != 0) {
-			int cable = buf[i] >> 4;
-			int length = f_midi_cin_length[buf[i] & 0x0f];
-			f_midi_read_data(ep, cable, &buf[i + 1], length);
-		}
-}
-
-static void
-f_midi_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct f_midi *midi = ep->driver_data;
-	struct usb_composite_dev *cdev = midi->func.config->cdev;
-	int status = req->status;
-
-	switch (status) {
-	case 0:			 /* normal completion */
-		if (ep == midi->out_ep) {
-			/* We received stuff. req is queued again, below */
-			f_midi_handle_out_data(ep, req);
-		} else if (ep == midi->in_ep) {
-			/* Our transmit completed. See if there's more to go.
-			 * f_midi_transmit eats req, don't queue it again. */
-			f_midi_transmit(midi, req);
-			return;
-		}
-		break;
-
-	/* this endpoint is normally active while we're configured */
-	case -ECONNABORTED:	/* hardware forced ep reset */
-	case -ECONNRESET:	/* request dequeued */
-	case -ESHUTDOWN:	/* disconnect from host */
-		VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
-				req->actual, req->length);
-		if (ep == midi->out_ep)
-			f_midi_handle_out_data(ep, req);
-
-		free_ep_req(ep, req);
-		return;
-
-	case -EOVERFLOW:	/* buffer overrun on read means that
-				 * we didn't provide a big enough buffer.
-				 */
-	default:
-		DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
-				status, req->actual, req->length);
-		break;
-	case -EREMOTEIO:	/* short read */
-		break;
-	}
-
-	status = usb_ep_queue(ep, req, GFP_ATOMIC);
-	if (status) {
-		ERROR(cdev, "kill %s:  resubmit %d bytes --> %d\n",
-				ep->name, req->length, status);
-		usb_ep_set_halt(ep);
-		/* FIXME recover later ... somehow */
-	}
-}
-
-static int f_midi_start_ep(struct f_midi *midi,
-			   struct usb_function *f,
-			   struct usb_ep *ep)
-{
-	int err;
-	struct usb_composite_dev *cdev = f->config->cdev;
-
-	if (ep->driver_data)
-		usb_ep_disable(ep);
-
-	err = config_ep_by_speed(midi->gadget, f, ep);
-	if (err) {
-		ERROR(cdev, "can't configure %s: %d\n", ep->name, err);
-		return err;
-	}
-
-	err = usb_ep_enable(ep);
-	if (err) {
-		ERROR(cdev, "can't start %s: %d\n", ep->name, err);
-		return err;
-	}
-
-	ep->driver_data = midi;
-
-	return 0;
-}
-
-static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
-{
-	struct f_midi *midi = func_to_midi(f);
-	struct usb_composite_dev *cdev = f->config->cdev;
-	unsigned i;
-	int err;
-
-	err = f_midi_start_ep(midi, f, midi->in_ep);
-	if (err)
-		return err;
-
-	err = f_midi_start_ep(midi, f, midi->out_ep);
-	if (err)
-		return err;
-
-	if (midi->out_ep->driver_data)
-		usb_ep_disable(midi->out_ep);
-
-	err = config_ep_by_speed(midi->gadget, f, midi->out_ep);
-	if (err) {
-		ERROR(cdev, "can't configure %s: %d\n",
-		      midi->out_ep->name, err);
-		return err;
-	}
-
-	err = usb_ep_enable(midi->out_ep);
-	if (err) {
-		ERROR(cdev, "can't start %s: %d\n",
-		      midi->out_ep->name, err);
-		return err;
-	}
-
-	midi->out_ep->driver_data = midi;
-
-	/* allocate a bunch of read buffers and queue them all at once. */
-	for (i = 0; i < midi->qlen && err == 0; i++) {
-		struct usb_request *req =
-			midi_alloc_ep_req(midi->out_ep, midi->buflen);
-		if (req == NULL)
-			return -ENOMEM;
-
-		req->complete = f_midi_complete;
-		err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
-		if (err) {
-			ERROR(midi, "%s queue req: %d\n",
-				    midi->out_ep->name, err);
-		}
-	}
-
-	return 0;
-}
-
-static void f_midi_disable(struct usb_function *f)
-{
-	struct f_midi *midi = func_to_midi(f);
-	struct usb_composite_dev *cdev = f->config->cdev;
-
-	DBG(cdev, "disable\n");
-
-	/*
-	 * just disable endpoints, forcing completion of pending i/o.
-	 * all our completion handlers free their requests in this case.
-	 */
-	usb_ep_disable(midi->in_ep);
-	usb_ep_disable(midi->out_ep);
-}
-
-static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct usb_composite_dev *cdev = f->config->cdev;
-	struct f_midi *midi = func_to_midi(f);
-	struct snd_card *card;
-
-	DBG(cdev, "unbind\n");
-
-	/* just to be sure */
-	f_midi_disable(f);
-
-	card = midi->card;
-	midi->card = NULL;
-	if (card)
-		snd_card_free(card);
-
-	kfree(midi->id);
-	midi->id = NULL;
-
-	usb_free_all_descriptors(f);
-	kfree(midi);
-}
-
-static int f_midi_snd_free(struct snd_device *device)
-{
-	return 0;
-}
-
-static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0,
-					uint8_t p1, uint8_t p2, uint8_t p3)
-{
-	unsigned length = req->length;
-	u8 *buf = (u8 *)req->buf + length;
-
-	buf[0] = p0;
-	buf[1] = p1;
-	buf[2] = p2;
-	buf[3] = p3;
-	req->length = length + 4;
-}
-
-/*
- * Converts MIDI commands to USB MIDI packets.
- */
-static void f_midi_transmit_byte(struct usb_request *req,
-				 struct gmidi_in_port *port, uint8_t b)
-{
-	uint8_t p0 = port->cable << 4;
-
-	if (b >= 0xf8) {
-		f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0);
-	} else if (b >= 0xf0) {
-		switch (b) {
-		case 0xf0:
-			port->data[0] = b;
-			port->state = STATE_SYSEX_1;
-			break;
-		case 0xf1:
-		case 0xf3:
-			port->data[0] = b;
-			port->state = STATE_1PARAM;
-			break;
-		case 0xf2:
-			port->data[0] = b;
-			port->state = STATE_2PARAM_1;
-			break;
-		case 0xf4:
-		case 0xf5:
-			port->state = STATE_UNKNOWN;
-			break;
-		case 0xf6:
-			f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0);
-			port->state = STATE_UNKNOWN;
-			break;
-		case 0xf7:
-			switch (port->state) {
-			case STATE_SYSEX_0:
-				f_midi_transmit_packet(req,
-					p0 | 0x05, 0xf7, 0, 0);
-				break;
-			case STATE_SYSEX_1:
-				f_midi_transmit_packet(req,
-					p0 | 0x06, port->data[0], 0xf7, 0);
-				break;
-			case STATE_SYSEX_2:
-				f_midi_transmit_packet(req,
-					p0 | 0x07, port->data[0],
-					port->data[1], 0xf7);
-				break;
-			}
-			port->state = STATE_UNKNOWN;
-			break;
-		}
-	} else if (b >= 0x80) {
-		port->data[0] = b;
-		if (b >= 0xc0 && b <= 0xdf)
-			port->state = STATE_1PARAM;
-		else
-			port->state = STATE_2PARAM_1;
-	} else { /* b < 0x80 */
-		switch (port->state) {
-		case STATE_1PARAM:
-			if (port->data[0] < 0xf0) {
-				p0 |= port->data[0] >> 4;
-			} else {
-				p0 |= 0x02;
-				port->state = STATE_UNKNOWN;
-			}
-			f_midi_transmit_packet(req, p0, port->data[0], b, 0);
-			break;
-		case STATE_2PARAM_1:
-			port->data[1] = b;
-			port->state = STATE_2PARAM_2;
-			break;
-		case STATE_2PARAM_2:
-			if (port->data[0] < 0xf0) {
-				p0 |= port->data[0] >> 4;
-				port->state = STATE_2PARAM_1;
-			} else {
-				p0 |= 0x03;
-				port->state = STATE_UNKNOWN;
-			}
-			f_midi_transmit_packet(req,
-				p0, port->data[0], port->data[1], b);
-			break;
-		case STATE_SYSEX_0:
-			port->data[0] = b;
-			port->state = STATE_SYSEX_1;
-			break;
-		case STATE_SYSEX_1:
-			port->data[1] = b;
-			port->state = STATE_SYSEX_2;
-			break;
-		case STATE_SYSEX_2:
-			f_midi_transmit_packet(req,
-				p0 | 0x04, port->data[0], port->data[1], b);
-			port->state = STATE_SYSEX_0;
-			break;
-		}
-	}
-}
-
-static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
-{
-	struct usb_ep *ep = midi->in_ep;
-	int i;
-
-	if (!ep)
-		return;
-
-	if (!req)
-		req = midi_alloc_ep_req(ep, midi->buflen);
-
-	if (!req) {
-		ERROR(midi, "gmidi_transmit: alloc_ep_request failed\n");
-		return;
-	}
-	req->length = 0;
-	req->complete = f_midi_complete;
-
-	for (i = 0; i < MAX_PORTS; i++) {
-		struct gmidi_in_port *port = midi->in_port[i];
-		struct snd_rawmidi_substream *substream = midi->in_substream[i];
-
-		if (!port || !port->active || !substream)
-			continue;
-
-		while (req->length + 3 < midi->buflen) {
-			uint8_t b;
-			if (snd_rawmidi_transmit(substream, &b, 1) != 1) {
-				port->active = 0;
-				break;
-			}
-			f_midi_transmit_byte(req, port, b);
-		}
-	}
-
-	if (req->length > 0)
-		usb_ep_queue(ep, req, GFP_ATOMIC);
-	else
-		free_ep_req(ep, req);
-}
-
-static void f_midi_in_tasklet(unsigned long data)
-{
-	struct f_midi *midi = (struct f_midi *) data;
-	f_midi_transmit(midi, NULL);
-}
-
-static int f_midi_in_open(struct snd_rawmidi_substream *substream)
-{
-	struct f_midi *midi = substream->rmidi->private_data;
-
-	if (!midi->in_port[substream->number])
-		return -EINVAL;
-
-	VDBG(midi, "%s()\n", __func__);
-	midi->in_substream[substream->number] = substream;
-	midi->in_port[substream->number]->state = STATE_UNKNOWN;
-	return 0;
-}
-
-static int f_midi_in_close(struct snd_rawmidi_substream *substream)
-{
-	struct f_midi *midi = substream->rmidi->private_data;
-
-	VDBG(midi, "%s()\n", __func__);
-	return 0;
-}
-
-static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
-{
-	struct f_midi *midi = substream->rmidi->private_data;
-
-	if (!midi->in_port[substream->number])
-		return;
-
-	VDBG(midi, "%s() %d\n", __func__, up);
-	midi->in_port[substream->number]->active = up;
-	if (up)
-		tasklet_hi_schedule(&midi->tasklet);
-}
-
-static int f_midi_out_open(struct snd_rawmidi_substream *substream)
-{
-	struct f_midi *midi = substream->rmidi->private_data;
-
-	if (substream->number >= MAX_PORTS)
-		return -EINVAL;
-
-	VDBG(midi, "%s()\n", __func__);
-	midi->out_substream[substream->number] = substream;
-	return 0;
-}
-
-static int f_midi_out_close(struct snd_rawmidi_substream *substream)
-{
-	struct f_midi *midi = substream->rmidi->private_data;
-
-	VDBG(midi, "%s()\n", __func__);
-	return 0;
-}
-
-static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up)
-{
-	struct f_midi *midi = substream->rmidi->private_data;
-
-	VDBG(midi, "%s()\n", __func__);
-
-	if (up)
-		set_bit(substream->number, &midi->out_triggered);
-	else
-		clear_bit(substream->number, &midi->out_triggered);
-}
-
-static struct snd_rawmidi_ops gmidi_in_ops = {
-	.open = f_midi_in_open,
-	.close = f_midi_in_close,
-	.trigger = f_midi_in_trigger,
-};
-
-static struct snd_rawmidi_ops gmidi_out_ops = {
-	.open = f_midi_out_open,
-	.close = f_midi_out_close,
-	.trigger = f_midi_out_trigger
-};
-
-/* register as a sound "card" */
-static int f_midi_register_card(struct f_midi *midi)
-{
-	struct snd_card *card;
-	struct snd_rawmidi *rmidi;
-	int err;
-	static struct snd_device_ops ops = {
-		.dev_free = f_midi_snd_free,
-	};
-
-	err = snd_card_new(&midi->gadget->dev, midi->index, midi->id,
-			   THIS_MODULE, 0, &card);
-	if (err < 0) {
-		ERROR(midi, "snd_card_new() failed\n");
-		goto fail;
-	}
-	midi->card = card;
-
-	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops);
-	if (err < 0) {
-		ERROR(midi, "snd_device_new() failed: error %d\n", err);
-		goto fail;
-	}
-
-	strcpy(card->driver, f_midi_longname);
-	strcpy(card->longname, f_midi_longname);
-	strcpy(card->shortname, f_midi_shortname);
-
-	/* Set up rawmidi */
-	snd_component_add(card, "MIDI");
-	err = snd_rawmidi_new(card, card->longname, 0,
-			      midi->out_ports, midi->in_ports, &rmidi);
-	if (err < 0) {
-		ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err);
-		goto fail;
-	}
-	midi->rmidi = rmidi;
-	strcpy(rmidi->name, card->shortname);
-	rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
-			    SNDRV_RAWMIDI_INFO_INPUT |
-			    SNDRV_RAWMIDI_INFO_DUPLEX;
-	rmidi->private_data = midi;
-
-	/*
-	 * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT.
-	 * It's an upside-down world being a gadget.
-	 */
-	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
-	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
-
-	/* register it - we're ready to go */
-	err = snd_card_register(card);
-	if (err < 0) {
-		ERROR(midi, "snd_card_register() failed\n");
-		goto fail;
-	}
-
-	VDBG(midi, "%s() finished ok\n", __func__);
-	return 0;
-
-fail:
-	if (midi->card) {
-		snd_card_free(midi->card);
-		midi->card = NULL;
-	}
-	return err;
-}
-
-/* MIDI function driver setup/binding */
-
-static int __init
-f_midi_bind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct usb_descriptor_header **midi_function;
-	struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS];
-	struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS];
-	struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS];
-	struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS];
-	struct usb_composite_dev *cdev = c->cdev;
-	struct f_midi *midi = func_to_midi(f);
-	int status, n, jack = 1, i = 0;
-
-	/* maybe allocate device-global string ID */
-	if (midi_string_defs[0].id == 0) {
-		status = usb_string_id(c->cdev);
-		if (status < 0)
-			goto fail;
-		midi_string_defs[0].id = status;
-	}
-
-	/* We have two interfaces, AudioControl and MIDIStreaming */
-	status = usb_interface_id(c, f);
-	if (status < 0)
-		goto fail;
-	ac_interface_desc.bInterfaceNumber = status;
-
-	status = usb_interface_id(c, f);
-	if (status < 0)
-		goto fail;
-	ms_interface_desc.bInterfaceNumber = status;
-	ac_header_desc.baInterfaceNr[0] = status;
-
-	status = -ENODEV;
-
-	/* allocate instance-specific endpoints */
-	midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc);
-	if (!midi->in_ep)
-		goto fail;
-	midi->in_ep->driver_data = cdev;	/* claim */
-
-	midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc);
-	if (!midi->out_ep)
-		goto fail;
-	midi->out_ep->driver_data = cdev;	/* claim */
-
-	/* allocate temporary function list */
-	midi_function = kcalloc((MAX_PORTS * 4) + 9, sizeof(*midi_function),
-				GFP_KERNEL);
-	if (!midi_function) {
-		status = -ENOMEM;
-		goto fail;
-	}
-
-	/*
-	 * construct the function's descriptor set. As the number of
-	 * input and output MIDI ports is configurable, we have to do
-	 * it that way.
-	 */
-
-	/* add the headers - these are always the same */
-	midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc;
-	midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc;
-	midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc;
-
-	/* calculate the header's wTotalLength */
-	n = USB_DT_MS_HEADER_SIZE
-		+ (midi->in_ports + midi->out_ports) *
-			(USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
-	ms_header_desc.wTotalLength = cpu_to_le16(n);
-
-	midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc;
-
-	/* configure the external IN jacks, each linked to an embedded OUT jack */
-	for (n = 0; n < midi->in_ports; n++) {
-		struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n];
-		struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n];
-
-		in_ext->bLength			= USB_DT_MIDI_IN_SIZE;
-		in_ext->bDescriptorType		= USB_DT_CS_INTERFACE;
-		in_ext->bDescriptorSubtype	= USB_MS_MIDI_IN_JACK;
-		in_ext->bJackType		= USB_MS_EXTERNAL;
-		in_ext->bJackID			= jack++;
-		in_ext->iJack			= 0;
-		midi_function[i++] = (struct usb_descriptor_header *) in_ext;
-
-		out_emb->bLength		= USB_DT_MIDI_OUT_SIZE(1);
-		out_emb->bDescriptorType	= USB_DT_CS_INTERFACE;
-		out_emb->bDescriptorSubtype	= USB_MS_MIDI_OUT_JACK;
-		out_emb->bJackType		= USB_MS_EMBEDDED;
-		out_emb->bJackID		= jack++;
-		out_emb->bNrInputPins		= 1;
-		out_emb->pins[0].baSourcePin	= 1;
-		out_emb->pins[0].baSourceID	= in_ext->bJackID;
-		out_emb->iJack			= 0;
-		midi_function[i++] = (struct usb_descriptor_header *) out_emb;
-
-		/* link it to the endpoint */
-		ms_in_desc.baAssocJackID[n] = out_emb->bJackID;
-	}
-
-	/* configure the external OUT jacks, each linked to an embedded IN jack */
-	for (n = 0; n < midi->out_ports; n++) {
-		struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n];
-		struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n];
-
-		in_emb->bLength			= USB_DT_MIDI_IN_SIZE;
-		in_emb->bDescriptorType		= USB_DT_CS_INTERFACE;
-		in_emb->bDescriptorSubtype	= USB_MS_MIDI_IN_JACK;
-		in_emb->bJackType		= USB_MS_EMBEDDED;
-		in_emb->bJackID			= jack++;
-		in_emb->iJack			= 0;
-		midi_function[i++] = (struct usb_descriptor_header *) in_emb;
-
-		out_ext->bLength =		USB_DT_MIDI_OUT_SIZE(1);
-		out_ext->bDescriptorType =	USB_DT_CS_INTERFACE;
-		out_ext->bDescriptorSubtype =	USB_MS_MIDI_OUT_JACK;
-		out_ext->bJackType =		USB_MS_EXTERNAL;
-		out_ext->bJackID =		jack++;
-		out_ext->bNrInputPins =		1;
-		out_ext->iJack =		0;
-		out_ext->pins[0].baSourceID =	in_emb->bJackID;
-		out_ext->pins[0].baSourcePin =	1;
-		midi_function[i++] = (struct usb_descriptor_header *) out_ext;
-
-		/* link it to the endpoint */
-		ms_out_desc.baAssocJackID[n] = in_emb->bJackID;
-	}
-
-	/* configure the endpoint descriptors ... */
-	ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports);
-	ms_out_desc.bNumEmbMIDIJack = midi->in_ports;
-
-	ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports);
-	ms_in_desc.bNumEmbMIDIJack = midi->out_ports;
-
-	/* ... and add them to the list */
-	midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc;
-	midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc;
-	midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc;
-	midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc;
-	midi_function[i++] = NULL;
-
-	/*
-	 * support all relevant hardware speeds... we expect that when
-	 * hardware is dual speed, all bulk-capable endpoints work at
-	 * both speeds
-	 */
-	/* copy descriptors, and track endpoint copies */
-	f->fs_descriptors = usb_copy_descriptors(midi_function);
-	if (!f->fs_descriptors)
-		goto fail_f_midi;
-
-	if (gadget_is_dualspeed(c->cdev->gadget)) {
-		bulk_in_desc.wMaxPacketSize = cpu_to_le16(512);
-		bulk_out_desc.wMaxPacketSize = cpu_to_le16(512);
-		f->hs_descriptors = usb_copy_descriptors(midi_function);
-		if (!f->hs_descriptors)
-			goto fail_f_midi;
-	}
-
-	kfree(midi_function);
-
-	return 0;
-
-fail_f_midi:
-	kfree(midi_function);
-	usb_free_descriptors(f->hs_descriptors);
-fail:
-	/* we might as well release our claims on endpoints */
-	if (midi->out_ep)
-		midi->out_ep->driver_data = NULL;
-	if (midi->in_ep)
-		midi->in_ep->driver_data = NULL;
-
-	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
-
-	return status;
-}
-
-/**
- * f_midi_bind_config - add USB MIDI function to a configuration
- * @c: the configuration to supcard the USB audio function
- * @index: the soundcard index to use for the ALSA device creation
- * @id: the soundcard id to use for the ALSA device creation
- * @buflen: the buffer length to use
- * @qlen the number of read requests to pre-allocate
- * Context: single threaded during gadget setup
- *
- * Returns zero on success, else negative errno.
- */
-int __init f_midi_bind_config(struct usb_configuration *c,
-			      int index, char *id,
-			      unsigned int in_ports,
-			      unsigned int out_ports,
-			      unsigned int buflen,
-			      unsigned int qlen)
-{
-	struct f_midi *midi;
-	int status, i;
-
-	/* sanity check */
-	if (in_ports > MAX_PORTS || out_ports > MAX_PORTS)
-		return -EINVAL;
-
-	/* allocate and initialize one new instance */
-	midi = kzalloc(sizeof *midi, GFP_KERNEL);
-	if (!midi) {
-		status = -ENOMEM;
-		goto fail;
-	}
-
-	for (i = 0; i < in_ports; i++) {
-		struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
-		if (!port) {
-			status = -ENOMEM;
-			goto setup_fail;
-		}
-
-		port->midi = midi;
-		port->active = 0;
-		port->cable = i;
-		midi->in_port[i] = port;
-	}
-
-	midi->gadget = c->cdev->gadget;
-	tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi);
-
-	/* set up ALSA midi devices */
-	midi->in_ports = in_ports;
-	midi->out_ports = out_ports;
-	status = f_midi_register_card(midi);
-	if (status < 0)
-		goto setup_fail;
-
-	midi->func.name        = "gmidi function";
-	midi->func.strings     = midi_strings;
-	midi->func.bind        = f_midi_bind;
-	midi->func.unbind      = f_midi_unbind;
-	midi->func.set_alt     = f_midi_set_alt;
-	midi->func.disable     = f_midi_disable;
-
-	midi->id = kstrdup(id, GFP_KERNEL);
-	midi->index = index;
-	midi->buflen = buflen;
-	midi->qlen = qlen;
-
-	status = usb_add_function(c, &midi->func);
-	if (status)
-		goto setup_fail;
-
-	return 0;
-
-setup_fail:
-	for (--i; i >= 0; i--)
-		kfree(midi->in_port[i]);
-	kfree(midi);
-fail:
-	return status;
-}
-