Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 731 insertions, 0 deletions

diff --git a/drivers/usb/gadget/function/f_phonet.c b/drivers/usb/gadget/function/f_phonet.c
new file mode 100644
index 000000000..0b468f5d5
--- /dev/null
+++ b/drivers/usb/gadget/function/f_phonet.c
@@ -0,0 +1,731 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * f_phonet.c -- USB CDC Phonet function
+ *
+ * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
+ *
+ * Author: Rémi Denis-Courmont
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_phonet.h>
+#include <linux/if_arp.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/composite.h>
+
+#include "u_phonet.h"
+#include "u_ether.h"
+
+#define PN_MEDIA_USB	0x1B
+#define MAXPACKET	512
+#if (PAGE_SIZE % MAXPACKET)
+#error MAXPACKET must divide PAGE_SIZE!
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+struct phonet_port {
+	struct f_phonet			*usb;
+	spinlock_t			lock;
+};
+
+struct f_phonet {
+	struct usb_function		function;
+	struct {
+		struct sk_buff		*skb;
+		spinlock_t		lock;
+	} rx;
+	struct net_device		*dev;
+	struct usb_ep			*in_ep, *out_ep;
+
+	struct usb_request		*in_req;
+	struct usb_request		*out_reqv[];
+};
+
+static int phonet_rxq_size = 17;
+
+static inline struct f_phonet *func_to_pn(struct usb_function *f)
+{
+	return container_of(f, struct f_phonet, function);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#define USB_CDC_SUBCLASS_PHONET	0xfe
+#define USB_CDC_PHONET_TYPE	0xab
+
+static struct usb_interface_descriptor
+pn_control_intf_desc = {
+	.bLength =		sizeof pn_control_intf_desc,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	/* .bInterfaceNumber =	DYNAMIC, */
+	.bInterfaceClass =	USB_CLASS_COMM,
+	.bInterfaceSubClass =	USB_CDC_SUBCLASS_PHONET,
+};
+
+static const struct usb_cdc_header_desc
+pn_header_desc = {
+	.bLength =		sizeof pn_header_desc,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_HEADER_TYPE,
+	.bcdCDC =		cpu_to_le16(0x0110),
+};
+
+static const struct usb_cdc_header_desc
+pn_phonet_desc = {
+	.bLength =		sizeof pn_phonet_desc,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_PHONET_TYPE,
+	.bcdCDC =		cpu_to_le16(0x1505), /* ??? */
+};
+
+static struct usb_cdc_union_desc
+pn_union_desc = {
+	.bLength =		sizeof pn_union_desc,
+	.bDescriptorType =	USB_DT_CS_INTERFACE,
+	.bDescriptorSubType =	USB_CDC_UNION_TYPE,
+
+	/* .bMasterInterface0 =	DYNAMIC, */
+	/* .bSlaveInterface0 =	DYNAMIC, */
+};
+
+static struct usb_interface_descriptor
+pn_data_nop_intf_desc = {
+	.bLength =		sizeof pn_data_nop_intf_desc,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	/* .bInterfaceNumber =	DYNAMIC, */
+	.bAlternateSetting =	0,
+	.bNumEndpoints =	0,
+	.bInterfaceClass =	USB_CLASS_CDC_DATA,
+};
+
+static struct usb_interface_descriptor
+pn_data_intf_desc = {
+	.bLength =		sizeof pn_data_intf_desc,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	/* .bInterfaceNumber =	DYNAMIC, */
+	.bAlternateSetting =	1,
+	.bNumEndpoints =	2,
+	.bInterfaceClass =	USB_CLASS_CDC_DATA,
+};
+
+static struct usb_endpoint_descriptor
+pn_fs_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_OUT,
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor
+pn_hs_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_OUT,
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize =	cpu_to_le16(MAXPACKET),
+};
+
+static struct usb_endpoint_descriptor
+pn_fs_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_IN,
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+};
+
+static struct usb_endpoint_descriptor
+pn_hs_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_IN,
+	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize =	cpu_to_le16(512),
+};
+
+static struct usb_descriptor_header *fs_pn_function[] = {
+	(struct usb_descriptor_header *) &pn_control_intf_desc,
+	(struct usb_descriptor_header *) &pn_header_desc,
+	(struct usb_descriptor_header *) &pn_phonet_desc,
+	(struct usb_descriptor_header *) &pn_union_desc,
+	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
+	(struct usb_descriptor_header *) &pn_data_intf_desc,
+	(struct usb_descriptor_header *) &pn_fs_sink_desc,
+	(struct usb_descriptor_header *) &pn_fs_source_desc,
+	NULL,
+};
+
+static struct usb_descriptor_header *hs_pn_function[] = {
+	(struct usb_descriptor_header *) &pn_control_intf_desc,
+	(struct usb_descriptor_header *) &pn_header_desc,
+	(struct usb_descriptor_header *) &pn_phonet_desc,
+	(struct usb_descriptor_header *) &pn_union_desc,
+	(struct usb_descriptor_header *) &pn_data_nop_intf_desc,
+	(struct usb_descriptor_header *) &pn_data_intf_desc,
+	(struct usb_descriptor_header *) &pn_hs_sink_desc,
+	(struct usb_descriptor_header *) &pn_hs_source_desc,
+	NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int pn_net_open(struct net_device *dev)
+{
+	netif_wake_queue(dev);
+	return 0;
+}
+
+static int pn_net_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_phonet *fp = ep->driver_data;
+	struct net_device *dev = fp->dev;
+	struct sk_buff *skb = req->context;
+
+	switch (req->status) {
+	case 0:
+		dev->stats.tx_packets++;
+		dev->stats.tx_bytes += skb->len;
+		break;
+
+	case -ESHUTDOWN: /* disconnected */
+	case -ECONNRESET: /* disabled */
+		dev->stats.tx_aborted_errors++;
+		fallthrough;
+	default:
+		dev->stats.tx_errors++;
+	}
+
+	dev_kfree_skb_any(skb);
+	netif_wake_queue(dev);
+}
+
+static netdev_tx_t pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct phonet_port *port = netdev_priv(dev);
+	struct f_phonet *fp;
+	struct usb_request *req;
+	unsigned long flags;
+
+	if (skb->protocol != htons(ETH_P_PHONET))
+		goto out;
+
+	spin_lock_irqsave(&port->lock, flags);
+	fp = port->usb;
+	if (unlikely(!fp)) /* race with carrier loss */
+		goto out_unlock;
+
+	req = fp->in_req;
+	req->buf = skb->data;
+	req->length = skb->len;
+	req->complete = pn_tx_complete;
+	req->zero = 1;
+	req->context = skb;
+
+	if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
+		goto out_unlock;
+
+	netif_stop_queue(dev);
+	skb = NULL;
+
+out_unlock:
+	spin_unlock_irqrestore(&port->lock, flags);
+out:
+	if (unlikely(skb)) {
+		dev_kfree_skb(skb);
+		dev->stats.tx_dropped++;
+	}
+	return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops pn_netdev_ops = {
+	.ndo_open	= pn_net_open,
+	.ndo_stop	= pn_net_close,
+	.ndo_start_xmit	= pn_net_xmit,
+};
+
+static void pn_net_setup(struct net_device *dev)
+{
+	dev->features		= 0;
+	dev->type		= ARPHRD_PHONET;
+	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
+	dev->mtu		= PHONET_DEV_MTU;
+	dev->min_mtu		= PHONET_MIN_MTU;
+	dev->max_mtu		= PHONET_MAX_MTU;
+	dev->hard_header_len	= 1;
+	dev->dev_addr[0]	= PN_MEDIA_USB;
+	dev->addr_len		= 1;
+	dev->tx_queue_len	= 1;
+
+	dev->netdev_ops		= &pn_netdev_ops;
+	dev->needs_free_netdev	= true;
+	dev->header_ops		= &phonet_header_ops;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Queue buffer for data from the host
+ */
+static int
+pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
+{
+	struct page *page;
+	int err;
+
+	page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
+	if (!page)
+		return -ENOMEM;
+
+	req->buf = page_address(page);
+	req->length = PAGE_SIZE;
+	req->context = page;
+
+	err = usb_ep_queue(fp->out_ep, req, gfp_flags);
+	if (unlikely(err))
+		put_page(page);
+	return err;
+}
+
+static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	struct f_phonet *fp = ep->driver_data;
+	struct net_device *dev = fp->dev;
+	struct page *page = req->context;
+	struct sk_buff *skb;
+	unsigned long flags;
+	int status = req->status;
+
+	switch (status) {
+	case 0:
+		spin_lock_irqsave(&fp->rx.lock, flags);
+		skb = fp->rx.skb;
+		if (!skb)
+			skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
+		if (req->actual < req->length) /* Last fragment */
+			fp->rx.skb = NULL;
+		spin_unlock_irqrestore(&fp->rx.lock, flags);
+
+		if (unlikely(!skb))
+			break;
+
+		if (skb->len == 0) { /* First fragment */
+			skb->protocol = htons(ETH_P_PHONET);
+			skb_reset_mac_header(skb);
+			/* Can't use pskb_pull() on page in IRQ */
+			skb_put_data(skb, page_address(page), 1);
+		}
+
+		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
+				skb->len <= 1, req->actual, PAGE_SIZE);
+		page = NULL;
+
+		if (req->actual < req->length) { /* Last fragment */
+			skb->dev = dev;
+			dev->stats.rx_packets++;
+			dev->stats.rx_bytes += skb->len;
+
+			netif_rx(skb);
+		}
+		break;
+
+	/* Do not resubmit in these cases: */
+	case -ESHUTDOWN: /* disconnect */
+	case -ECONNABORTED: /* hw reset */
+	case -ECONNRESET: /* dequeued (unlink or netif down) */
+		req = NULL;
+		break;
+
+	/* Do resubmit in these cases: */
+	case -EOVERFLOW: /* request buffer overflow */
+		dev->stats.rx_over_errors++;
+		fallthrough;
+	default:
+		dev->stats.rx_errors++;
+		break;
+	}
+
+	if (page)
+		put_page(page);
+	if (req)
+		pn_rx_submit(fp, req, GFP_ATOMIC);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void __pn_reset(struct usb_function *f)
+{
+	struct f_phonet *fp = func_to_pn(f);
+	struct net_device *dev = fp->dev;
+	struct phonet_port *port = netdev_priv(dev);
+
+	netif_carrier_off(dev);
+	port->usb = NULL;
+
+	usb_ep_disable(fp->out_ep);
+	usb_ep_disable(fp->in_ep);
+	if (fp->rx.skb) {
+		dev_kfree_skb_irq(fp->rx.skb);
+		fp->rx.skb = NULL;
+	}
+}
+
+static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+	struct f_phonet *fp = func_to_pn(f);
+	struct usb_gadget *gadget = fp->function.config->cdev->gadget;
+
+	if (intf == pn_control_intf_desc.bInterfaceNumber)
+		/* control interface, no altsetting */
+		return (alt > 0) ? -EINVAL : 0;
+
+	if (intf == pn_data_intf_desc.bInterfaceNumber) {
+		struct net_device *dev = fp->dev;
+		struct phonet_port *port = netdev_priv(dev);
+
+		/* data intf (0: inactive, 1: active) */
+		if (alt > 1)
+			return -EINVAL;
+
+		spin_lock(&port->lock);
+
+		if (fp->in_ep->enabled)
+			__pn_reset(f);
+
+		if (alt == 1) {
+			int i;
+
+			if (config_ep_by_speed(gadget, f, fp->in_ep) ||
+			    config_ep_by_speed(gadget, f, fp->out_ep)) {
+				fp->in_ep->desc = NULL;
+				fp->out_ep->desc = NULL;
+				spin_unlock(&port->lock);
+				return -EINVAL;
+			}
+			usb_ep_enable(fp->out_ep);
+			usb_ep_enable(fp->in_ep);
+
+			port->usb = fp;
+			fp->out_ep->driver_data = fp;
+			fp->in_ep->driver_data = fp;
+
+			netif_carrier_on(dev);
+			for (i = 0; i < phonet_rxq_size; i++)
+				pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
+		}
+		spin_unlock(&port->lock);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int pn_get_alt(struct usb_function *f, unsigned intf)
+{
+	struct f_phonet *fp = func_to_pn(f);
+
+	if (intf == pn_control_intf_desc.bInterfaceNumber)
+		return 0;
+
+	if (intf == pn_data_intf_desc.bInterfaceNumber) {
+		struct phonet_port *port = netdev_priv(fp->dev);
+		u8 alt;
+
+		spin_lock(&port->lock);
+		alt = port->usb != NULL;
+		spin_unlock(&port->lock);
+		return alt;
+	}
+
+	return -EINVAL;
+}
+
+static void pn_disconnect(struct usb_function *f)
+{
+	struct f_phonet *fp = func_to_pn(f);
+	struct phonet_port *port = netdev_priv(fp->dev);
+	unsigned long flags;
+
+	/* remain disabled until set_alt */
+	spin_lock_irqsave(&port->lock, flags);
+	__pn_reset(f);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int pn_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	struct usb_gadget *gadget = cdev->gadget;
+	struct f_phonet *fp = func_to_pn(f);
+	struct usb_ep *ep;
+	int status, i;
+
+	struct f_phonet_opts *phonet_opts;
+
+	phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst);
+
+	/*
+	 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
+	 * configurations are bound in sequence with list_for_each_entry,
+	 * in each configuration its functions are bound in sequence
+	 * with list_for_each_entry, so we assume no race condition
+	 * with regard to phonet_opts->bound access
+	 */
+	if (!phonet_opts->bound) {
+		gphonet_set_gadget(phonet_opts->net, gadget);
+		status = gphonet_register_netdev(phonet_opts->net);
+		if (status)
+			return status;
+		phonet_opts->bound = true;
+	}
+
+	/* Reserve interface IDs */
+	status = usb_interface_id(c, f);
+	if (status < 0)
+		goto err;
+	pn_control_intf_desc.bInterfaceNumber = status;
+	pn_union_desc.bMasterInterface0 = status;
+
+	status = usb_interface_id(c, f);
+	if (status < 0)
+		goto err;
+	pn_data_nop_intf_desc.bInterfaceNumber = status;
+	pn_data_intf_desc.bInterfaceNumber = status;
+	pn_union_desc.bSlaveInterface0 = status;
+
+	/* Reserve endpoints */
+	status = -ENODEV;
+	ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
+	if (!ep)
+		goto err;
+	fp->out_ep = ep;
+
+	ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
+	if (!ep)
+		goto err;
+	fp->in_ep = ep;
+
+	pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
+	pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
+
+	/* Do not try to bind Phonet twice... */
+	status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
+			NULL, NULL);
+	if (status)
+		goto err;
+
+	/* Incoming USB requests */
+	status = -ENOMEM;
+	for (i = 0; i < phonet_rxq_size; i++) {
+		struct usb_request *req;
+
+		req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
+		if (!req)
+			goto err_req;
+
+		req->complete = pn_rx_complete;
+		fp->out_reqv[i] = req;
+	}
+
+	/* Outgoing USB requests */
+	fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
+	if (!fp->in_req)
+		goto err_req;
+
+	INFO(cdev, "USB CDC Phonet function\n");
+	INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
+		fp->out_ep->name, fp->in_ep->name);
+	return 0;
+
+err_req:
+	for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
+		usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
+	usb_free_all_descriptors(f);
+err:
+	ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
+	return status;
+}
+
+static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct f_phonet_opts,
+			func_inst.group);
+}
+
+static void phonet_attr_release(struct config_item *item)
+{
+	struct f_phonet_opts *opts = to_f_phonet_opts(item);
+
+	usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations phonet_item_ops = {
+	.release		= phonet_attr_release,
+};
+
+static ssize_t f_phonet_ifname_show(struct config_item *item, char *page)
+{
+	return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE);
+}
+
+CONFIGFS_ATTR_RO(f_phonet_, ifname);
+
+static struct configfs_attribute *phonet_attrs[] = {
+	&f_phonet_attr_ifname,
+	NULL,
+};
+
+static const struct config_item_type phonet_func_type = {
+	.ct_item_ops	= &phonet_item_ops,
+	.ct_attrs	= phonet_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+static void phonet_free_inst(struct usb_function_instance *f)
+{
+	struct f_phonet_opts *opts;
+
+	opts = container_of(f, struct f_phonet_opts, func_inst);
+	if (opts->bound)
+		gphonet_cleanup(opts->net);
+	else
+		free_netdev(opts->net);
+	kfree(opts);
+}
+
+static struct usb_function_instance *phonet_alloc_inst(void)
+{
+	struct f_phonet_opts *opts;
+
+	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+	if (!opts)
+		return ERR_PTR(-ENOMEM);
+
+	opts->func_inst.free_func_inst = phonet_free_inst;
+	opts->net = gphonet_setup_default();
+	if (IS_ERR(opts->net)) {
+		struct net_device *net = opts->net;
+		kfree(opts);
+		return ERR_CAST(net);
+	}
+
+	config_group_init_type_name(&opts->func_inst.group, "",
+			&phonet_func_type);
+
+	return &opts->func_inst;
+}
+
+static void phonet_free(struct usb_function *f)
+{
+	struct f_phonet *phonet;
+
+	phonet = func_to_pn(f);
+	kfree(phonet);
+}
+
+static void pn_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct f_phonet *fp = func_to_pn(f);
+	int i;
+
+	/* We are already disconnected */
+	if (fp->in_req)
+		usb_ep_free_request(fp->in_ep, fp->in_req);
+	for (i = 0; i < phonet_rxq_size; i++)
+		if (fp->out_reqv[i])
+			usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
+
+	usb_free_all_descriptors(f);
+}
+
+static struct usb_function *phonet_alloc(struct usb_function_instance *fi)
+{
+	struct f_phonet *fp;
+	struct f_phonet_opts *opts;
+	int size;
+
+	size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
+	fp = kzalloc(size, GFP_KERNEL);
+	if (!fp)
+		return ERR_PTR(-ENOMEM);
+
+	opts = container_of(fi, struct f_phonet_opts, func_inst);
+
+	fp->dev = opts->net;
+	fp->function.name = "phonet";
+	fp->function.bind = pn_bind;
+	fp->function.unbind = pn_unbind;
+	fp->function.set_alt = pn_set_alt;
+	fp->function.get_alt = pn_get_alt;
+	fp->function.disable = pn_disconnect;
+	fp->function.free_func = phonet_free;
+	spin_lock_init(&fp->rx.lock);
+
+	return &fp->function;
+}
+
+struct net_device *gphonet_setup_default(void)
+{
+	struct net_device *dev;
+	struct phonet_port *port;
+
+	/* Create net device */
+	dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN,
+			   pn_net_setup);
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	port = netdev_priv(dev);
+	spin_lock_init(&port->lock);
+	netif_carrier_off(dev);
+
+	return dev;
+}
+
+void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g)
+{
+	SET_NETDEV_DEV(net, &g->dev);
+}
+
+int gphonet_register_netdev(struct net_device *net)
+{
+	int status;
+
+	status = register_netdev(net);
+	if (status)
+		free_netdev(net);
+
+	return status;
+}
+
+void gphonet_cleanup(struct net_device *dev)
+{
+	unregister_netdev(dev);
+}
+
+DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc);
+MODULE_AUTHOR("Rémi Denis-Courmont");
+MODULE_LICENSE("GPL");