1 files changed, 758 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 000000000000..f2b781773eed
--- /dev/null
+++ b/drivers/usb/gadget/function/f_phonet.c
@@ -0,0 +1,758 @@
+/*
+ * f_phonet.c -- USB CDC Phonet function
+ *
+ * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#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[0];
+};
+
+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++;
+        default:
+                dev->stats.tx_errors++;
+        }
+
+        dev_kfree_skb_any(skb);
+        netif_wake_queue(dev);
+}
+
+static int 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 int pn_net_mtu(struct net_device *dev, int new_mtu)
+{
+        if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
+                return -EINVAL;
+        dev->mtu = new_mtu;
+        return 0;
+}
+
+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,
+        .ndo_change_mtu = pn_net_mtu,
+};
+
+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->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->destructor         = free_netdev;
+        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 = __skb_alloc_page(gfp_flags | __GFP_NOMEMALLOC, NULL);
+        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 */
+                        memcpy(skb_put(skb, 1), 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++;
+        default:
+                dev->stats.rx_errors++;
+                break;
+        }
+
+        if (page)
+                put_page(page);
+        if (req)
+                pn_rx_submit(fp, req, GFP_ATOMIC | __GFP_COLD);
+}
+
+/*-------------------------------------------------------------------------*/
+
+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);
+                __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 | __GFP_COLD);
+                }
+                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->driver_data = fp; /* Claim */
+
+        ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
+        if (!ep)
+                goto err;
+        fp->in_ep = ep;
+        ep->driver_data = fp; /* Claim */
+
+        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);
+        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]);
+err:
+        usb_free_all_descriptors(f);
+        if (fp->out_ep)
+                fp->out_ep->driver_data = NULL;
+        if (fp->in_ep)
+                fp->in_ep->driver_data = NULL;
+        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);
+}
+
+CONFIGFS_ATTR_STRUCT(f_phonet_opts);
+static ssize_t f_phonet_attr_show(struct config_item *item,
+                                struct configfs_attribute *attr,
+                                char *page)
+{
+        struct f_phonet_opts *opts = to_f_phonet_opts(item);
+        struct f_phonet_opts_attribute *f_phonet_opts_attr =
+                container_of(attr, struct f_phonet_opts_attribute, attr);
+        ssize_t ret = 0;
+
+        if (f_phonet_opts_attr->show)
+                ret = f_phonet_opts_attr->show(opts, page);
+        return ret;
+}
+
+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,
+        .show_attribute         = f_phonet_attr_show,
+};
+
+static ssize_t f_phonet_ifname_show(struct f_phonet_opts *opts, char *page)
+{
+        return gether_get_ifname(opts->net, page, PAGE_SIZE);
+}
+
+static struct f_phonet_opts_attribute f_phonet_ifname =
+        __CONFIGFS_ATTR_RO(ifname, f_phonet_ifname_show);
+
+static struct configfs_attribute *phonet_attrs[] = {
+        &f_phonet_ifname.attr,
+        NULL,
+};
+
+static 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", 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");