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, 1179 deletions

diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
deleted file mode 100644
index 6e6f87656e7b..000000000000
--- a/drivers/usb/gadget/u_ether.c
+++ /dev/null
@@ -1,1179 +0,0 @@
-/*
- * u_ether.c -- Ethernet-over-USB link layer utilities for Gadget stack
- *
- * Copyright (C) 2003-2005,2008 David Brownell
- * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
- * Copyright (C) 2008 Nokia Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-/* #define VERBOSE_DEBUG */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/gfp.h>
-#include <linux/device.h>
-#include <linux/ctype.h>
-#include <linux/etherdevice.h>
-#include <linux/ethtool.h>
-#include <linux/if_vlan.h>
-
-#include "u_ether.h"
-
-
-/*
- * This component encapsulates the Ethernet link glue needed to provide
- * one (!) network link through the USB gadget stack, normally "usb0".
- *
- * The control and data models are handled by the function driver which
- * connects to this code; such as CDC Ethernet (ECM or EEM),
- * "CDC Subset", or RNDIS.  That includes all descriptor and endpoint
- * management.
- *
- * Link level addressing is handled by this component using module
- * parameters; if no such parameters are provided, random link level
- * addresses are used.  Each end of the link uses one address.  The
- * host end address is exported in various ways, and is often recorded
- * in configuration databases.
- *
- * The driver which assembles each configuration using such a link is
- * responsible for ensuring that each configuration includes at most one
- * instance of is network link.  (The network layer provides ways for
- * this single "physical" link to be used by multiple virtual links.)
- */
-
-#define UETH__VERSION	"29-May-2008"
-
-struct eth_dev {
-	/* lock is held while accessing port_usb
-	 */
-	spinlock_t		lock;
-	struct gether		*port_usb;
-
-	struct net_device	*net;
-	struct usb_gadget	*gadget;
-
-	spinlock_t		req_lock;	/* guard {rx,tx}_reqs */
-	struct list_head	tx_reqs, rx_reqs;
-	atomic_t		tx_qlen;
-
-	struct sk_buff_head	rx_frames;
-
-	unsigned		qmult;
-
-	unsigned		header_len;
-	struct sk_buff		*(*wrap)(struct gether *, struct sk_buff *skb);
-	int			(*unwrap)(struct gether *,
-						struct sk_buff *skb,
-						struct sk_buff_head *list);
-
-	struct work_struct	work;
-
-	unsigned long		todo;
-#define	WORK_RX_MEMORY		0
-
-	bool			zlp;
-	u8			host_mac[ETH_ALEN];
-	u8			dev_mac[ETH_ALEN];
-};
-
-/*-------------------------------------------------------------------------*/
-
-#define RX_EXTRA	20	/* bytes guarding against rx overflows */
-
-#define DEFAULT_QLEN	2	/* double buffering by default */
-
-/* for dual-speed hardware, use deeper queues at high/super speed */
-static inline int qlen(struct usb_gadget *gadget, unsigned qmult)
-{
-	if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH ||
-					    gadget->speed == USB_SPEED_SUPER))
-		return qmult * DEFAULT_QLEN;
-	else
-		return DEFAULT_QLEN;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* REVISIT there must be a better way than having two sets
- * of debug calls ...
- */
-
-#undef DBG
-#undef VDBG
-#undef ERROR
-#undef INFO
-
-#define xprintk(d, level, fmt, args...) \
-	printk(level "%s: " fmt , (d)->net->name , ## args)
-
-#ifdef DEBUG
-#undef DEBUG
-#define DBG(dev, fmt, args...) \
-	xprintk(dev , KERN_DEBUG , fmt , ## args)
-#else
-#define DBG(dev, fmt, args...) \
-	do { } while (0)
-#endif /* DEBUG */
-
-#ifdef VERBOSE_DEBUG
-#define VDBG	DBG
-#else
-#define VDBG(dev, fmt, args...) \
-	do { } while (0)
-#endif /* DEBUG */
-
-#define ERROR(dev, fmt, args...) \
-	xprintk(dev , KERN_ERR , fmt , ## args)
-#define INFO(dev, fmt, args...) \
-	xprintk(dev , KERN_INFO , fmt , ## args)
-
-/*-------------------------------------------------------------------------*/
-
-/* NETWORK DRIVER HOOKUP (to the layer above this driver) */
-
-static int ueth_change_mtu(struct net_device *net, int new_mtu)
-{
-	struct eth_dev	*dev = netdev_priv(net);
-	unsigned long	flags;
-	int		status = 0;
-
-	/* don't change MTU on "live" link (peer won't know) */
-	spin_lock_irqsave(&dev->lock, flags);
-	if (dev->port_usb)
-		status = -EBUSY;
-	else if (new_mtu <= ETH_HLEN || new_mtu > ETH_FRAME_LEN)
-		status = -ERANGE;
-	else
-		net->mtu = new_mtu;
-	spin_unlock_irqrestore(&dev->lock, flags);
-
-	return status;
-}
-
-static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
-{
-	struct eth_dev *dev = netdev_priv(net);
-
-	strlcpy(p->driver, "g_ether", sizeof(p->driver));
-	strlcpy(p->version, UETH__VERSION, sizeof(p->version));
-	strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version));
-	strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info));
-}
-
-/* REVISIT can also support:
- *   - WOL (by tracking suspends and issuing remote wakeup)
- *   - msglevel (implies updated messaging)
- *   - ... probably more ethtool ops
- */
-
-static const struct ethtool_ops ops = {
-	.get_drvinfo = eth_get_drvinfo,
-	.get_link = ethtool_op_get_link,
-};
-
-static void defer_kevent(struct eth_dev *dev, int flag)
-{
-	if (test_and_set_bit(flag, &dev->todo))
-		return;
-	if (!schedule_work(&dev->work))
-		ERROR(dev, "kevent %d may have been dropped\n", flag);
-	else
-		DBG(dev, "kevent %d scheduled\n", flag);
-}
-
-static void rx_complete(struct usb_ep *ep, struct usb_request *req);
-
-static int
-rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
-{
-	struct sk_buff	*skb;
-	int		retval = -ENOMEM;
-	size_t		size = 0;
-	struct usb_ep	*out;
-	unsigned long	flags;
-
-	spin_lock_irqsave(&dev->lock, flags);
-	if (dev->port_usb)
-		out = dev->port_usb->out_ep;
-	else
-		out = NULL;
-	spin_unlock_irqrestore(&dev->lock, flags);
-
-	if (!out)
-		return -ENOTCONN;
-
-
-	/* Padding up to RX_EXTRA handles minor disagreements with host.
-	 * Normally we use the USB "terminate on short read" convention;
-	 * so allow up to (N*maxpacket), since that memory is normally
-	 * already allocated.  Some hardware doesn't deal well with short
-	 * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
-	 * byte off the end (to force hardware errors on overflow).
-	 *
-	 * RNDIS uses internal framing, and explicitly allows senders to
-	 * pad to end-of-packet.  That's potentially nice for speed, but
-	 * means receivers can't recover lost synch on their own (because
-	 * new packets don't only start after a short RX).
-	 */
-	size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA;
-	size += dev->port_usb->header_len;
-	size += out->maxpacket - 1;
-	size -= size % out->maxpacket;
-
-	if (dev->port_usb->is_fixed)
-		size = max_t(size_t, size, dev->port_usb->fixed_out_len);
-
-	skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags);
-	if (skb == NULL) {
-		DBG(dev, "no rx skb\n");
-		goto enomem;
-	}
-
-	/* Some platforms perform better when IP packets are aligned,
-	 * but on at least one, checksumming fails otherwise.  Note:
-	 * RNDIS headers involve variable numbers of LE32 values.
-	 */
-	skb_reserve(skb, NET_IP_ALIGN);
-
-	req->buf = skb->data;
-	req->length = size;
-	req->complete = rx_complete;
-	req->context = skb;
-
-	retval = usb_ep_queue(out, req, gfp_flags);
-	if (retval == -ENOMEM)
-enomem:
-		defer_kevent(dev, WORK_RX_MEMORY);
-	if (retval) {
-		DBG(dev, "rx submit --> %d\n", retval);
-		if (skb)
-			dev_kfree_skb_any(skb);
-		spin_lock_irqsave(&dev->req_lock, flags);
-		list_add(&req->list, &dev->rx_reqs);
-		spin_unlock_irqrestore(&dev->req_lock, flags);
-	}
-	return retval;
-}
-
-static void rx_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct sk_buff	*skb = req->context, *skb2;
-	struct eth_dev	*dev = ep->driver_data;
-	int		status = req->status;
-
-	switch (status) {
-
-	/* normal completion */
-	case 0:
-		skb_put(skb, req->actual);
-
-		if (dev->unwrap) {
-			unsigned long	flags;
-
-			spin_lock_irqsave(&dev->lock, flags);
-			if (dev->port_usb) {
-				status = dev->unwrap(dev->port_usb,
-							skb,
-							&dev->rx_frames);
-			} else {
-				dev_kfree_skb_any(skb);
-				status = -ENOTCONN;
-			}
-			spin_unlock_irqrestore(&dev->lock, flags);
-		} else {
-			skb_queue_tail(&dev->rx_frames, skb);
-		}
-		skb = NULL;
-
-		skb2 = skb_dequeue(&dev->rx_frames);
-		while (skb2) {
-			if (status < 0
-					|| ETH_HLEN > skb2->len
-					|| skb2->len > VLAN_ETH_FRAME_LEN) {
-				dev->net->stats.rx_errors++;
-				dev->net->stats.rx_length_errors++;
-				DBG(dev, "rx length %d\n", skb2->len);
-				dev_kfree_skb_any(skb2);
-				goto next_frame;
-			}
-			skb2->protocol = eth_type_trans(skb2, dev->net);
-			dev->net->stats.rx_packets++;
-			dev->net->stats.rx_bytes += skb2->len;
-
-			/* no buffer copies needed, unless hardware can't
-			 * use skb buffers.
-			 */
-			status = netif_rx(skb2);
-next_frame:
-			skb2 = skb_dequeue(&dev->rx_frames);
-		}
-		break;
-
-	/* software-driven interface shutdown */
-	case -ECONNRESET:		/* unlink */
-	case -ESHUTDOWN:		/* disconnect etc */
-		VDBG(dev, "rx shutdown, code %d\n", status);
-		goto quiesce;
-
-	/* for hardware automagic (such as pxa) */
-	case -ECONNABORTED:		/* endpoint reset */
-		DBG(dev, "rx %s reset\n", ep->name);
-		defer_kevent(dev, WORK_RX_MEMORY);
-quiesce:
-		dev_kfree_skb_any(skb);
-		goto clean;
-
-	/* data overrun */
-	case -EOVERFLOW:
-		dev->net->stats.rx_over_errors++;
-		/* FALLTHROUGH */
-
-	default:
-		dev->net->stats.rx_errors++;
-		DBG(dev, "rx status %d\n", status);
-		break;
-	}
-
-	if (skb)
-		dev_kfree_skb_any(skb);
-	if (!netif_running(dev->net)) {
-clean:
-		spin_lock(&dev->req_lock);
-		list_add(&req->list, &dev->rx_reqs);
-		spin_unlock(&dev->req_lock);
-		req = NULL;
-	}
-	if (req)
-		rx_submit(dev, req, GFP_ATOMIC);
-}
-
-static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n)
-{
-	unsigned		i;
-	struct usb_request	*req;
-
-	if (!n)
-		return -ENOMEM;
-
-	/* queue/recycle up to N requests */
-	i = n;
-	list_for_each_entry(req, list, list) {
-		if (i-- == 0)
-			goto extra;
-	}
-	while (i--) {
-		req = usb_ep_alloc_request(ep, GFP_ATOMIC);
-		if (!req)
-			return list_empty(list) ? -ENOMEM : 0;
-		list_add(&req->list, list);
-	}
-	return 0;
-
-extra:
-	/* free extras */
-	for (;;) {
-		struct list_head	*next;
-
-		next = req->list.next;
-		list_del(&req->list);
-		usb_ep_free_request(ep, req);
-
-		if (next == list)
-			break;
-
-		req = container_of(next, struct usb_request, list);
-	}
-	return 0;
-}
-
-static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n)
-{
-	int	status;
-
-	spin_lock(&dev->req_lock);
-	status = prealloc(&dev->tx_reqs, link->in_ep, n);
-	if (status < 0)
-		goto fail;
-	status = prealloc(&dev->rx_reqs, link->out_ep, n);
-	if (status < 0)
-		goto fail;
-	goto done;
-fail:
-	DBG(dev, "can't alloc requests\n");
-done:
-	spin_unlock(&dev->req_lock);
-	return status;
-}
-
-static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags)
-{
-	struct usb_request	*req;
-	unsigned long		flags;
-
-	/* fill unused rxq slots with some skb */
-	spin_lock_irqsave(&dev->req_lock, flags);
-	while (!list_empty(&dev->rx_reqs)) {
-		req = container_of(dev->rx_reqs.next,
-				struct usb_request, list);
-		list_del_init(&req->list);
-		spin_unlock_irqrestore(&dev->req_lock, flags);
-
-		if (rx_submit(dev, req, gfp_flags) < 0) {
-			defer_kevent(dev, WORK_RX_MEMORY);
-			return;
-		}
-
-		spin_lock_irqsave(&dev->req_lock, flags);
-	}
-	spin_unlock_irqrestore(&dev->req_lock, flags);
-}
-
-static void eth_work(struct work_struct *work)
-{
-	struct eth_dev	*dev = container_of(work, struct eth_dev, work);
-
-	if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) {
-		if (netif_running(dev->net))
-			rx_fill(dev, GFP_KERNEL);
-	}
-
-	if (dev->todo)
-		DBG(dev, "work done, flags = 0x%lx\n", dev->todo);
-}
-
-static void tx_complete(struct usb_ep *ep, struct usb_request *req)
-{
-	struct sk_buff	*skb = req->context;
-	struct eth_dev	*dev = ep->driver_data;
-
-	switch (req->status) {
-	default:
-		dev->net->stats.tx_errors++;
-		VDBG(dev, "tx err %d\n", req->status);
-		/* FALLTHROUGH */
-	case -ECONNRESET:		/* unlink */
-	case -ESHUTDOWN:		/* disconnect etc */
-		break;
-	case 0:
-		dev->net->stats.tx_bytes += skb->len;
-	}
-	dev->net->stats.tx_packets++;
-
-	spin_lock(&dev->req_lock);
-	list_add(&req->list, &dev->tx_reqs);
-	spin_unlock(&dev->req_lock);
-	dev_kfree_skb_any(skb);
-
-	atomic_dec(&dev->tx_qlen);
-	if (netif_carrier_ok(dev->net))
-		netif_wake_queue(dev->net);
-}
-
-static inline int is_promisc(u16 cdc_filter)
-{
-	return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
-}
-
-static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
-					struct net_device *net)
-{
-	struct eth_dev		*dev = netdev_priv(net);
-	int			length = 0;
-	int			retval;
-	struct usb_request	*req = NULL;
-	unsigned long		flags;
-	struct usb_ep		*in;
-	u16			cdc_filter;
-
-	spin_lock_irqsave(&dev->lock, flags);
-	if (dev->port_usb) {
-		in = dev->port_usb->in_ep;
-		cdc_filter = dev->port_usb->cdc_filter;
-	} else {
-		in = NULL;
-		cdc_filter = 0;
-	}
-	spin_unlock_irqrestore(&dev->lock, flags);
-
-	if (skb && !in) {
-		dev_kfree_skb_any(skb);
-		return NETDEV_TX_OK;
-	}
-
-	/* apply outgoing CDC or RNDIS filters */
-	if (skb && !is_promisc(cdc_filter)) {
-		u8		*dest = skb->data;
-
-		if (is_multicast_ether_addr(dest)) {
-			u16	type;
-
-			/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
-			 * SET_ETHERNET_MULTICAST_FILTERS requests
-			 */
-			if (is_broadcast_ether_addr(dest))
-				type = USB_CDC_PACKET_TYPE_BROADCAST;
-			else
-				type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
-			if (!(cdc_filter & type)) {
-				dev_kfree_skb_any(skb);
-				return NETDEV_TX_OK;
-			}
-		}
-		/* ignores USB_CDC_PACKET_TYPE_DIRECTED */
-	}
-
-	spin_lock_irqsave(&dev->req_lock, flags);
-	/*
-	 * this freelist can be empty if an interrupt triggered disconnect()
-	 * and reconfigured the gadget (shutting down this queue) after the
-	 * network stack decided to xmit but before we got the spinlock.
-	 */
-	if (list_empty(&dev->tx_reqs)) {
-		spin_unlock_irqrestore(&dev->req_lock, flags);
-		return NETDEV_TX_BUSY;
-	}
-
-	req = container_of(dev->tx_reqs.next, struct usb_request, list);
-	list_del(&req->list);
-
-	/* temporarily stop TX queue when the freelist empties */
-	if (list_empty(&dev->tx_reqs))
-		netif_stop_queue(net);
-	spin_unlock_irqrestore(&dev->req_lock, flags);
-
-	/* no buffer copies needed, unless the network stack did it
-	 * or the hardware can't use skb buffers.
-	 * or there's not enough space for extra headers we need
-	 */
-	if (dev->wrap) {
-		unsigned long	flags;
-
-		spin_lock_irqsave(&dev->lock, flags);
-		if (dev->port_usb)
-			skb = dev->wrap(dev->port_usb, skb);
-		spin_unlock_irqrestore(&dev->lock, flags);
-		if (!skb) {
-			/* Multi frame CDC protocols may store the frame for
-			 * later which is not a dropped frame.
-			 */
-			if (dev->port_usb->supports_multi_frame)
-				goto multiframe;
-			goto drop;
-		}
-	}
-
-	length = skb->len;
-	req->buf = skb->data;
-	req->context = skb;
-	req->complete = tx_complete;
-
-	/* NCM requires no zlp if transfer is dwNtbInMaxSize */
-	if (dev->port_usb->is_fixed &&
-	    length == dev->port_usb->fixed_in_len &&
-	    (length % in->maxpacket) == 0)
-		req->zero = 0;
-	else
-		req->zero = 1;
-
-	/* use zlp framing on tx for strict CDC-Ether conformance,
-	 * though any robust network rx path ignores extra padding.
-	 * and some hardware doesn't like to write zlps.
-	 */
-	if (req->zero && !dev->zlp && (length % in->maxpacket) == 0)
-		length++;
-
-	req->length = length;
-
-	/* throttle high/super speed IRQ rate back slightly */
-	if (gadget_is_dualspeed(dev->gadget))
-		req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH ||
-				     dev->gadget->speed == USB_SPEED_SUPER)
-			? ((atomic_read(&dev->tx_qlen) % dev->qmult) != 0)
-			: 0;
-
-	retval = usb_ep_queue(in, req, GFP_ATOMIC);
-	switch (retval) {
-	default:
-		DBG(dev, "tx queue err %d\n", retval);
-		break;
-	case 0:
-		net->trans_start = jiffies;
-		atomic_inc(&dev->tx_qlen);
-	}
-
-	if (retval) {
-		dev_kfree_skb_any(skb);
-drop:
-		dev->net->stats.tx_dropped++;
-multiframe:
-		spin_lock_irqsave(&dev->req_lock, flags);
-		if (list_empty(&dev->tx_reqs))
-			netif_start_queue(net);
-		list_add(&req->list, &dev->tx_reqs);
-		spin_unlock_irqrestore(&dev->req_lock, flags);
-	}
-	return NETDEV_TX_OK;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static void eth_start(struct eth_dev *dev, gfp_t gfp_flags)
-{
-	DBG(dev, "%s\n", __func__);
-
-	/* fill the rx queue */
-	rx_fill(dev, gfp_flags);
-
-	/* and open the tx floodgates */
-	atomic_set(&dev->tx_qlen, 0);
-	netif_wake_queue(dev->net);
-}
-
-static int eth_open(struct net_device *net)
-{
-	struct eth_dev	*dev = netdev_priv(net);
-	struct gether	*link;
-
-	DBG(dev, "%s\n", __func__);
-	if (netif_carrier_ok(dev->net))
-		eth_start(dev, GFP_KERNEL);
-
-	spin_lock_irq(&dev->lock);
-	link = dev->port_usb;
-	if (link && link->open)
-		link->open(link);
-	spin_unlock_irq(&dev->lock);
-
-	return 0;
-}
-
-static int eth_stop(struct net_device *net)
-{
-	struct eth_dev	*dev = netdev_priv(net);
-	unsigned long	flags;
-
-	VDBG(dev, "%s\n", __func__);
-	netif_stop_queue(net);
-
-	DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
-		dev->net->stats.rx_packets, dev->net->stats.tx_packets,
-		dev->net->stats.rx_errors, dev->net->stats.tx_errors
-		);
-
-	/* ensure there are no more active requests */
-	spin_lock_irqsave(&dev->lock, flags);
-	if (dev->port_usb) {
-		struct gether	*link = dev->port_usb;
-		const struct usb_endpoint_descriptor *in;
-		const struct usb_endpoint_descriptor *out;
-
-		if (link->close)
-			link->close(link);
-
-		/* NOTE:  we have no abort-queue primitive we could use
-		 * to cancel all pending I/O.  Instead, we disable then
-		 * reenable the endpoints ... this idiom may leave toggle
-		 * wrong, but that's a self-correcting error.
-		 *
-		 * REVISIT:  we *COULD* just let the transfers complete at
-		 * their own pace; the network stack can handle old packets.
-		 * For the moment we leave this here, since it works.
-		 */
-		in = link->in_ep->desc;
-		out = link->out_ep->desc;
-		usb_ep_disable(link->in_ep);
-		usb_ep_disable(link->out_ep);
-		if (netif_carrier_ok(net)) {
-			DBG(dev, "host still using in/out endpoints\n");
-			link->in_ep->desc = in;
-			link->out_ep->desc = out;
-			usb_ep_enable(link->in_ep);
-			usb_ep_enable(link->out_ep);
-		}
-	}
-	spin_unlock_irqrestore(&dev->lock, flags);
-
-	return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int get_ether_addr(const char *str, u8 *dev_addr)
-{
-	if (str) {
-		unsigned	i;
-
-		for (i = 0; i < 6; i++) {
-			unsigned char num;
-
-			if ((*str == '.') || (*str == ':'))
-				str++;
-			num = hex_to_bin(*str++) << 4;
-			num |= hex_to_bin(*str++);
-			dev_addr [i] = num;
-		}
-		if (is_valid_ether_addr(dev_addr))
-			return 0;
-	}
-	eth_random_addr(dev_addr);
-	return 1;
-}
-
-static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len)
-{
-	if (len < 18)
-		return -EINVAL;
-
-	snprintf(str, len, "%02x:%02x:%02x:%02x:%02x:%02x",
-		 dev_addr[0], dev_addr[1], dev_addr[2],
-		 dev_addr[3], dev_addr[4], dev_addr[5]);
-	return 18;
-}
-
-static const struct net_device_ops eth_netdev_ops = {
-	.ndo_open		= eth_open,
-	.ndo_stop		= eth_stop,
-	.ndo_start_xmit		= eth_start_xmit,
-	.ndo_change_mtu		= ueth_change_mtu,
-	.ndo_set_mac_address 	= eth_mac_addr,
-	.ndo_validate_addr	= eth_validate_addr,
-};
-
-static struct device_type gadget_type = {
-	.name	= "gadget",
-};
-
-/**
- * gether_setup_name - initialize one ethernet-over-usb link
- * @g: gadget to associated with these links
- * @ethaddr: NULL, or a buffer in which the ethernet address of the
- *	host side of the link is recorded
- * @netname: name for network device (for example, "usb")
- * Context: may sleep
- *
- * This sets up the single network link that may be exported by a
- * gadget driver using this framework.  The link layer addresses are
- * set up using module parameters.
- *
- * Returns an eth_dev pointer on success, or an ERR_PTR on failure.
- */
-struct eth_dev *gether_setup_name(struct usb_gadget *g,
-		const char *dev_addr, const char *host_addr,
-		u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname)
-{
-	struct eth_dev		*dev;
-	struct net_device	*net;
-	int			status;
-
-	net = alloc_etherdev(sizeof *dev);
-	if (!net)
-		return ERR_PTR(-ENOMEM);
-
-	dev = netdev_priv(net);
-	spin_lock_init(&dev->lock);
-	spin_lock_init(&dev->req_lock);
-	INIT_WORK(&dev->work, eth_work);
-	INIT_LIST_HEAD(&dev->tx_reqs);
-	INIT_LIST_HEAD(&dev->rx_reqs);
-
-	skb_queue_head_init(&dev->rx_frames);
-
-	/* network device setup */
-	dev->net = net;
-	dev->qmult = qmult;
-	snprintf(net->name, sizeof(net->name), "%s%%d", netname);
-
-	if (get_ether_addr(dev_addr, net->dev_addr))
-		dev_warn(&g->dev,
-			"using random %s ethernet address\n", "self");
-	if (get_ether_addr(host_addr, dev->host_mac))
-		dev_warn(&g->dev,
-			"using random %s ethernet address\n", "host");
-
-	if (ethaddr)
-		memcpy(ethaddr, dev->host_mac, ETH_ALEN);
-
-	net->netdev_ops = &eth_netdev_ops;
-
-	net->ethtool_ops = &ops;
-
-	dev->gadget = g;
-	SET_NETDEV_DEV(net, &g->dev);
-	SET_NETDEV_DEVTYPE(net, &gadget_type);
-
-	status = register_netdev(net);
-	if (status < 0) {
-		dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
-		free_netdev(net);
-		dev = ERR_PTR(status);
-	} else {
-		INFO(dev, "MAC %pM\n", net->dev_addr);
-		INFO(dev, "HOST MAC %pM\n", dev->host_mac);
-
-		/*
-		 * two kinds of host-initiated state changes:
-		 *  - iff DATA transfer is active, carrier is "on"
-		 *  - tx queueing enabled if open *and* carrier is "on"
-		 */
-		netif_carrier_off(net);
-	}
-
-	return dev;
-}
-EXPORT_SYMBOL_GPL(gether_setup_name);
-
-struct net_device *gether_setup_name_default(const char *netname)
-{
-	struct net_device	*net;
-	struct eth_dev		*dev;
-
-	net = alloc_etherdev(sizeof(*dev));
-	if (!net)
-		return ERR_PTR(-ENOMEM);
-
-	dev = netdev_priv(net);
-	spin_lock_init(&dev->lock);
-	spin_lock_init(&dev->req_lock);
-	INIT_WORK(&dev->work, eth_work);
-	INIT_LIST_HEAD(&dev->tx_reqs);
-	INIT_LIST_HEAD(&dev->rx_reqs);
-
-	skb_queue_head_init(&dev->rx_frames);
-
-	/* network device setup */
-	dev->net = net;
-	dev->qmult = QMULT_DEFAULT;
-	snprintf(net->name, sizeof(net->name), "%s%%d", netname);
-
-	eth_random_addr(dev->dev_mac);
-	pr_warn("using random %s ethernet address\n", "self");
-	eth_random_addr(dev->host_mac);
-	pr_warn("using random %s ethernet address\n", "host");
-
-	net->netdev_ops = &eth_netdev_ops;
-
-	net->ethtool_ops = &ops;
-	SET_NETDEV_DEVTYPE(net, &gadget_type);
-
-	return net;
-}
-EXPORT_SYMBOL_GPL(gether_setup_name_default);
-
-int gether_register_netdev(struct net_device *net)
-{
-	struct eth_dev *dev;
-	struct usb_gadget *g;
-	struct sockaddr sa;
-	int status;
-
-	if (!net->dev.parent)
-		return -EINVAL;
-	dev = netdev_priv(net);
-	g = dev->gadget;
-	status = register_netdev(net);
-	if (status < 0) {
-		dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
-		return status;
-	} else {
-		INFO(dev, "HOST MAC %pM\n", dev->host_mac);
-
-		/* two kinds of host-initiated state changes:
-		 *  - iff DATA transfer is active, carrier is "on"
-		 *  - tx queueing enabled if open *and* carrier is "on"
-		 */
-		netif_carrier_off(net);
-	}
-	sa.sa_family = net->type;
-	memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN);
-	rtnl_lock();
-	status = dev_set_mac_address(net, &sa);
-	rtnl_unlock();
-	if (status)
-		pr_warn("cannot set self ethernet address: %d\n", status);
-	else
-		INFO(dev, "MAC %pM\n", dev->dev_mac);
-
-	return status;
-}
-EXPORT_SYMBOL_GPL(gether_register_netdev);
-
-void gether_set_gadget(struct net_device *net, struct usb_gadget *g)
-{
-	struct eth_dev *dev;
-
-	dev = netdev_priv(net);
-	dev->gadget = g;
-	SET_NETDEV_DEV(net, &g->dev);
-}
-EXPORT_SYMBOL_GPL(gether_set_gadget);
-
-int gether_set_dev_addr(struct net_device *net, const char *dev_addr)
-{
-	struct eth_dev *dev;
-	u8 new_addr[ETH_ALEN];
-
-	dev = netdev_priv(net);
-	if (get_ether_addr(dev_addr, new_addr))
-		return -EINVAL;
-	memcpy(dev->dev_mac, new_addr, ETH_ALEN);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(gether_set_dev_addr);
-
-int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len)
-{
-	struct eth_dev *dev;
-
-	dev = netdev_priv(net);
-	return get_ether_addr_str(dev->dev_mac, dev_addr, len);
-}
-EXPORT_SYMBOL_GPL(gether_get_dev_addr);
-
-int gether_set_host_addr(struct net_device *net, const char *host_addr)
-{
-	struct eth_dev *dev;
-	u8 new_addr[ETH_ALEN];
-
-	dev = netdev_priv(net);
-	if (get_ether_addr(host_addr, new_addr))
-		return -EINVAL;
-	memcpy(dev->host_mac, new_addr, ETH_ALEN);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(gether_set_host_addr);
-
-int gether_get_host_addr(struct net_device *net, char *host_addr, int len)
-{
-	struct eth_dev *dev;
-
-	dev = netdev_priv(net);
-	return get_ether_addr_str(dev->host_mac, host_addr, len);
-}
-EXPORT_SYMBOL_GPL(gether_get_host_addr);
-
-int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len)
-{
-	struct eth_dev *dev;
-
-	if (len < 13)
-		return -EINVAL;
-
-	dev = netdev_priv(net);
-	snprintf(host_addr, len, "%pm", dev->host_mac);
-
-	return strlen(host_addr);
-}
-EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc);
-
-void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN])
-{
-	struct eth_dev *dev;
-
-	dev = netdev_priv(net);
-	memcpy(host_mac, dev->host_mac, ETH_ALEN);
-}
-EXPORT_SYMBOL_GPL(gether_get_host_addr_u8);
-
-void gether_set_qmult(struct net_device *net, unsigned qmult)
-{
-	struct eth_dev *dev;
-
-	dev = netdev_priv(net);
-	dev->qmult = qmult;
-}
-EXPORT_SYMBOL_GPL(gether_set_qmult);
-
-unsigned gether_get_qmult(struct net_device *net)
-{
-	struct eth_dev *dev;
-
-	dev = netdev_priv(net);
-	return dev->qmult;
-}
-EXPORT_SYMBOL_GPL(gether_get_qmult);
-
-int gether_get_ifname(struct net_device *net, char *name, int len)
-{
-	rtnl_lock();
-	strlcpy(name, netdev_name(net), len);
-	rtnl_unlock();
-	return strlen(name);
-}
-EXPORT_SYMBOL_GPL(gether_get_ifname);
-
-/**
- * gether_cleanup - remove Ethernet-over-USB device
- * Context: may sleep
- *
- * This is called to free all resources allocated by @gether_setup().
- */
-void gether_cleanup(struct eth_dev *dev)
-{
-	if (!dev)
-		return;
-
-	unregister_netdev(dev->net);
-	flush_work(&dev->work);
-	free_netdev(dev->net);
-}
-EXPORT_SYMBOL_GPL(gether_cleanup);
-
-/**
- * gether_connect - notify network layer that USB link is active
- * @link: the USB link, set up with endpoints, descriptors matching
- *	current device speed, and any framing wrapper(s) set up.
- * Context: irqs blocked
- *
- * This is called to activate endpoints and let the network layer know
- * the connection is active ("carrier detect").  It may cause the I/O
- * queues to open and start letting network packets flow, but will in
- * any case activate the endpoints so that they respond properly to the
- * USB host.
- *
- * Verify net_device pointer returned using IS_ERR().  If it doesn't
- * indicate some error code (negative errno), ep->driver_data values
- * have been overwritten.
- */
-struct net_device *gether_connect(struct gether *link)
-{
-	struct eth_dev		*dev = link->ioport;
-	int			result = 0;
-
-	if (!dev)
-		return ERR_PTR(-EINVAL);
-
-	link->in_ep->driver_data = dev;
-	result = usb_ep_enable(link->in_ep);
-	if (result != 0) {
-		DBG(dev, "enable %s --> %d\n",
-			link->in_ep->name, result);
-		goto fail0;
-	}
-
-	link->out_ep->driver_data = dev;
-	result = usb_ep_enable(link->out_ep);
-	if (result != 0) {
-		DBG(dev, "enable %s --> %d\n",
-			link->out_ep->name, result);
-		goto fail1;
-	}
-
-	if (result == 0)
-		result = alloc_requests(dev, link, qlen(dev->gadget,
-					dev->qmult));
-
-	if (result == 0) {
-		dev->zlp = link->is_zlp_ok;
-		DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult));
-
-		dev->header_len = link->header_len;
-		dev->unwrap = link->unwrap;
-		dev->wrap = link->wrap;
-
-		spin_lock(&dev->lock);
-		dev->port_usb = link;
-		if (netif_running(dev->net)) {
-			if (link->open)
-				link->open(link);
-		} else {
-			if (link->close)
-				link->close(link);
-		}
-		spin_unlock(&dev->lock);
-
-		netif_carrier_on(dev->net);
-		if (netif_running(dev->net))
-			eth_start(dev, GFP_ATOMIC);
-
-	/* on error, disable any endpoints  */
-	} else {
-		(void) usb_ep_disable(link->out_ep);
-fail1:
-		(void) usb_ep_disable(link->in_ep);
-	}
-fail0:
-	/* caller is responsible for cleanup on error */
-	if (result < 0)
-		return ERR_PTR(result);
-	return dev->net;
-}
-EXPORT_SYMBOL_GPL(gether_connect);
-
-/**
- * gether_disconnect - notify network layer that USB link is inactive
- * @link: the USB link, on which gether_connect() was called
- * Context: irqs blocked
- *
- * This is called to deactivate endpoints and let the network layer know
- * the connection went inactive ("no carrier").
- *
- * On return, the state is as if gether_connect() had never been called.
- * The endpoints are inactive, and accordingly without active USB I/O.
- * Pointers to endpoint descriptors and endpoint private data are nulled.
- */
-void gether_disconnect(struct gether *link)
-{
-	struct eth_dev		*dev = link->ioport;
-	struct usb_request	*req;
-
-	WARN_ON(!dev);
-	if (!dev)
-		return;
-
-	DBG(dev, "%s\n", __func__);
-
-	netif_stop_queue(dev->net);
-	netif_carrier_off(dev->net);
-
-	/* disable endpoints, forcing (synchronous) completion
-	 * of all pending i/o.  then free the request objects
-	 * and forget about the endpoints.
-	 */
-	usb_ep_disable(link->in_ep);
-	spin_lock(&dev->req_lock);
-	while (!list_empty(&dev->tx_reqs)) {
-		req = container_of(dev->tx_reqs.next,
-					struct usb_request, list);
-		list_del(&req->list);
-
-		spin_unlock(&dev->req_lock);
-		usb_ep_free_request(link->in_ep, req);
-		spin_lock(&dev->req_lock);
-	}
-	spin_unlock(&dev->req_lock);
-	link->in_ep->driver_data = NULL;
-	link->in_ep->desc = NULL;
-
-	usb_ep_disable(link->out_ep);
-	spin_lock(&dev->req_lock);
-	while (!list_empty(&dev->rx_reqs)) {
-		req = container_of(dev->rx_reqs.next,
-					struct usb_request, list);
-		list_del(&req->list);
-
-		spin_unlock(&dev->req_lock);
-		usb_ep_free_request(link->out_ep, req);
-		spin_lock(&dev->req_lock);
-	}
-	spin_unlock(&dev->req_lock);
-	link->out_ep->driver_data = NULL;
-	link->out_ep->desc = NULL;
-
-	/* finish forgetting about this USB link episode */
-	dev->header_len = 0;
-	dev->unwrap = NULL;
-	dev->wrap = NULL;
-
-	spin_lock(&dev->lock);
-	dev->port_usb = NULL;
-	spin_unlock(&dev->lock);
-}
-EXPORT_SYMBOL_GPL(gether_disconnect);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Brownell");