linux/drivers/usb/gadget/function/f_phonet.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * f_phonet.c -- USB CDC Phonet function
   4 *
   5 * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
   6 *
   7 * Author: R\xC3\xA9mi Denis-Courmont
   8 */
   9
  10#include <linux/mm.h>
  11#include <linux/slab.h>
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <linux/device.h>
  15
  16#include <linux/netdevice.h>
  17#include <linux/if_ether.h>
  18#include <linux/if_phonet.h>
  19#include <linux/if_arp.h>
  20
  21#include <linux/usb/ch9.h>
  22#include <linux/usb/cdc.h>
  23#include <linux/usb/composite.h>
  24
  25#include "u_phonet.h"
  26#include "u_ether.h"
  27
  28#define PN_MEDIA_USB    0x1B
  29#define MAXPACKET       512
  30#if (PAGE_SIZE % MAXPACKET)
  31#error MAXPACKET must divide PAGE_SIZE!
  32#endif
  33
  34/*-------------------------------------------------------------------------*/
  35
  36struct phonet_port {
  37        struct f_phonet                 *usb;
  38        spinlock_t                      lock;
  39};
  40
  41struct f_phonet {
  42        struct usb_function             function;
  43        struct {
  44                struct sk_buff          *skb;
  45                spinlock_t              lock;
  46        } rx;
  47        struct net_device               *dev;
  48        struct usb_ep                   *in_ep, *out_ep;
  49
  50        struct usb_request              *in_req;
  51        struct usb_request              *out_reqv[];
  52};
  53
  54static int phonet_rxq_size = 17;
  55
  56static inline struct f_phonet *func_to_pn(struct usb_function *f)
  57{
  58        return container_of(f, struct f_phonet, function);
  59}
  60
  61/*-------------------------------------------------------------------------*/
  62
  63#define USB_CDC_SUBCLASS_PHONET 0xfe
  64#define USB_CDC_PHONET_TYPE     0xab
  65
  66static struct usb_interface_descriptor
  67pn_control_intf_desc = {
  68        .bLength =              sizeof pn_control_intf_desc,
  69        .bDescriptorType =      USB_DT_INTERFACE,
  70
  71        /* .bInterfaceNumber =  DYNAMIC, */
  72        .bInterfaceClass =      USB_CLASS_COMM,
  73        .bInterfaceSubClass =   USB_CDC_SUBCLASS_PHONET,
  74};
  75
  76static const struct usb_cdc_header_desc
  77pn_header_desc = {
  78        .bLength =              sizeof pn_header_desc,
  79        .bDescriptorType =      USB_DT_CS_INTERFACE,
  80        .bDescriptorSubType =   USB_CDC_HEADER_TYPE,
  81        .bcdCDC =               cpu_to_le16(0x0110),
  82};
  83
  84static const struct usb_cdc_header_desc
  85pn_phonet_desc = {
  86        .bLength =              sizeof pn_phonet_desc,
  87        .bDescriptorType =      USB_DT_CS_INTERFACE,
  88        .bDescriptorSubType =   USB_CDC_PHONET_TYPE,
  89        .bcdCDC =               cpu_to_le16(0x1505), /* ??? */
  90};
  91
  92static struct usb_cdc_union_desc
  93pn_union_desc = {
  94        .bLength =              sizeof pn_union_desc,
  95        .bDescriptorType =      USB_DT_CS_INTERFACE,
  96        .bDescriptorSubType =   USB_CDC_UNION_TYPE,
  97
  98        /* .bMasterInterface0 = DYNAMIC, */
  99        /* .bSlaveInterface0 =  DYNAMIC, */
 100};
 101
 102static struct usb_interface_descriptor
 103pn_data_nop_intf_desc = {
 104        .bLength =              sizeof pn_data_nop_intf_desc,
 105        .bDescriptorType =      USB_DT_INTERFACE,
 106
 107        /* .bInterfaceNumber =  DYNAMIC, */
 108        .bAlternateSetting =    0,
 109        .bNumEndpoints =        0,
 110        .bInterfaceClass =      USB_CLASS_CDC_DATA,
 111};
 112
 113static struct usb_interface_descriptor
 114pn_data_intf_desc = {
 115        .bLength =              sizeof pn_data_intf_desc,
 116        .bDescriptorType =      USB_DT_INTERFACE,
 117
 118        /* .bInterfaceNumber =  DYNAMIC, */
 119        .bAlternateSetting =    1,
 120        .bNumEndpoints =        2,
 121        .bInterfaceClass =      USB_CLASS_CDC_DATA,
 122};
 123
 124static struct usb_endpoint_descriptor
 125pn_fs_sink_desc = {
 126        .bLength =              USB_DT_ENDPOINT_SIZE,
 127        .bDescriptorType =      USB_DT_ENDPOINT,
 128
 129        .bEndpointAddress =     USB_DIR_OUT,
 130        .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 131};
 132
 133static struct usb_endpoint_descriptor
 134pn_hs_sink_desc = {
 135        .bLength =              USB_DT_ENDPOINT_SIZE,
 136        .bDescriptorType =      USB_DT_ENDPOINT,
 137
 138        .bEndpointAddress =     USB_DIR_OUT,
 139        .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 140        .wMaxPacketSize =       cpu_to_le16(MAXPACKET),
 141};
 142
 143static struct usb_endpoint_descriptor
 144pn_fs_source_desc = {
 145        .bLength =              USB_DT_ENDPOINT_SIZE,
 146        .bDescriptorType =      USB_DT_ENDPOINT,
 147
 148        .bEndpointAddress =     USB_DIR_IN,
 149        .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 150};
 151
 152static struct usb_endpoint_descriptor
 153pn_hs_source_desc = {
 154        .bLength =              USB_DT_ENDPOINT_SIZE,
 155        .bDescriptorType =      USB_DT_ENDPOINT,
 156
 157        .bEndpointAddress =     USB_DIR_IN,
 158        .bmAttributes =         USB_ENDPOINT_XFER_BULK,
 159        .wMaxPacketSize =       cpu_to_le16(512),
 160};
 161
 162static struct usb_descriptor_header *fs_pn_function[] = {
 163        (struct usb_descriptor_header *) &pn_control_intf_desc,
 164        (struct usb_descriptor_header *) &pn_header_desc,
 165        (struct usb_descriptor_header *) &pn_phonet_desc,
 166        (struct usb_descriptor_header *) &pn_union_desc,
 167        (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
 168        (struct usb_descriptor_header *) &pn_data_intf_desc,
 169        (struct usb_descriptor_header *) &pn_fs_sink_desc,
 170        (struct usb_descriptor_header *) &pn_fs_source_desc,
 171        NULL,
 172};
 173
 174static struct usb_descriptor_header *hs_pn_function[] = {
 175        (struct usb_descriptor_header *) &pn_control_intf_desc,
 176        (struct usb_descriptor_header *) &pn_header_desc,
 177        (struct usb_descriptor_header *) &pn_phonet_desc,
 178        (struct usb_descriptor_header *) &pn_union_desc,
 179        (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
 180        (struct usb_descriptor_header *) &pn_data_intf_desc,
 181        (struct usb_descriptor_header *) &pn_hs_sink_desc,
 182        (struct usb_descriptor_header *) &pn_hs_source_desc,
 183        NULL,
 184};
 185
 186/*-------------------------------------------------------------------------*/
 187
 188static int pn_net_open(struct net_device *dev)
 189{
 190        netif_wake_queue(dev);
 191        return 0;
 192}
 193
 194static int pn_net_close(struct net_device *dev)
 195{
 196        netif_stop_queue(dev);
 197        return 0;
 198}
 199
 200static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
 201{
 202        struct f_phonet *fp = ep->driver_data;
 203        struct net_device *dev = fp->dev;
 204        struct sk_buff *skb = req->context;
 205
 206        switch (req->status) {
 207        case 0:
 208                dev->stats.tx_packets++;
 209                dev->stats.tx_bytes += skb->len;
 210                break;
 211
 212        case -ESHUTDOWN: /* disconnected */
 213        case -ECONNRESET: /* disabled */
 214                dev->stats.tx_aborted_errors++;
 215                fallthrough;
 216        default:
 217                dev->stats.tx_errors++;
 218        }
 219
 220        dev_kfree_skb_any(skb);
 221        netif_wake_queue(dev);
 222}
 223
 224static netdev_tx_t pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
 225{
 226        struct phonet_port *port = netdev_priv(dev);
 227        struct f_phonet *fp;
 228        struct usb_request *req;
 229        unsigned long flags;
 230
 231        if (skb->protocol != htons(ETH_P_PHONET))
 232                goto out;
 233
 234        spin_lock_irqsave(&port->lock, flags);
 235        fp = port->usb;
 236        if (unlikely(!fp)) /* race with carrier loss */
 237                goto out_unlock;
 238
 239        req = fp->in_req;
 240        req->buf = skb->data;
 241        req->length = skb->len;
 242        req->complete = pn_tx_complete;
 243        req->zero = 1;
 244        req->context = skb;
 245
 246        if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
 247                goto out_unlock;
 248
 249        netif_stop_queue(dev);
 250        skb = NULL;
 251
 252out_unlock:
 253        spin_unlock_irqrestore(&port->lock, flags);
 254out:
 255        if (unlikely(skb)) {
 256                dev_kfree_skb(skb);
 257                dev->stats.tx_dropped++;
 258        }
 259        return NETDEV_TX_OK;
 260}
 261
 262static const struct net_device_ops pn_netdev_ops = {
 263        .ndo_open       = pn_net_open,
 264        .ndo_stop       = pn_net_close,
 265        .ndo_start_xmit = pn_net_xmit,
 266};
 267
 268static void pn_net_setup(struct net_device *dev)
 269{
 270        dev->features           = 0;
 271        dev->type               = ARPHRD_PHONET;
 272        dev->flags              = IFF_POINTOPOINT | IFF_NOARP;
 273        dev->mtu                = PHONET_DEV_MTU;
 274        dev->min_mtu            = PHONET_MIN_MTU;
 275        dev->max_mtu            = PHONET_MAX_MTU;
 276        dev->hard_header_len    = 1;
 277        dev->dev_addr[0]        = PN_MEDIA_USB;
 278        dev->addr_len           = 1;
 279        dev->tx_queue_len       = 1;
 280
 281        dev->netdev_ops         = &pn_netdev_ops;
 282        dev->needs_free_netdev  = true;
 283        dev->header_ops         = &phonet_header_ops;
 284}
 285
 286/*-------------------------------------------------------------------------*/
 287
 288/*
 289 * Queue buffer for data from the host
 290 */
 291static int
 292pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
 293{
 294        struct page *page;
 295        int err;
 296
 297        page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
 298        if (!page)
 299                return -ENOMEM;
 300
 301        req->buf = page_address(page);
 302        req->length = PAGE_SIZE;
 303        req->context = page;
 304
 305        err = usb_ep_queue(fp->out_ep, req, gfp_flags);
 306        if (unlikely(err))
 307                put_page(page);
 308        return err;
 309}
 310
 311static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
 312{
 313        struct f_phonet *fp = ep->driver_data;
 314        struct net_device *dev = fp->dev;
 315        struct page *page = req->context;
 316        struct sk_buff *skb;
 317        unsigned long flags;
 318        int status = req->status;
 319
 320        switch (status) {
 321        case 0:
 322                spin_lock_irqsave(&fp->rx.lock, flags);
 323                skb = fp->rx.skb;
 324                if (!skb)
 325                        skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
 326                if (req->actual < req->length) /* Last fragment */
 327                        fp->rx.skb = NULL;
 328                spin_unlock_irqrestore(&fp->rx.lock, flags);
 329
 330                if (unlikely(!skb))
 331                        break;
 332
 333                if (skb->len == 0) { /* First fragment */
 334                        skb->protocol = htons(ETH_P_PHONET);
 335                        skb_reset_mac_header(skb);
 336                        /* Can't use pskb_pull() on page in IRQ */
 337                        skb_put_data(skb, page_address(page), 1);
 338                }
 339
 340                skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
 341                                skb->len <= 1, req->actual, PAGE_SIZE);
 342                page = NULL;
 343
 344                if (req->actual < req->length) { /* Last fragment */
 345                        skb->dev = dev;
 346                        dev->stats.rx_packets++;
 347                        dev->stats.rx_bytes += skb->len;
 348
 349                        netif_rx(skb);
 350                }
 351                break;
 352
 353        /* Do not resubmit in these cases: */
 354        case -ESHUTDOWN: /* disconnect */
 355        case -ECONNABORTED: /* hw reset */
 356        case -ECONNRESET: /* dequeued (unlink or netif down) */
 357                req = NULL;
 358                break;
 359
 360        /* Do resubmit in these cases: */
 361        case -EOVERFLOW: /* request buffer overflow */
 362                dev->stats.rx_over_errors++;
 363                fallthrough;
 364        default:
 365                dev->stats.rx_errors++;
 366                break;
 367        }
 368
 369        if (page)
 370                put_page(page);
 371        if (req)
 372                pn_rx_submit(fp, req, GFP_ATOMIC);
 373}
 374
 375/*-------------------------------------------------------------------------*/
 376
 377static void __pn_reset(struct usb_function *f)
 378{
 379        struct f_phonet *fp = func_to_pn(f);
 380        struct net_device *dev = fp->dev;
 381        struct phonet_port *port = netdev_priv(dev);
 382
 383        netif_carrier_off(dev);
 384        port->usb = NULL;
 385
 386        usb_ep_disable(fp->out_ep);
 387        usb_ep_disable(fp->in_ep);
 388        if (fp->rx.skb) {
 389                dev_kfree_skb_irq(fp->rx.skb);
 390                fp->rx.skb = NULL;
 391        }
 392}
 393
 394static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 395{
 396        struct f_phonet *fp = func_to_pn(f);
 397        struct usb_gadget *gadget = fp->function.config->cdev->gadget;
 398
 399        if (intf == pn_control_intf_desc.bInterfaceNumber)
 400                /* control interface, no altsetting */
 401                return (alt > 0) ? -EINVAL : 0;
 402
 403        if (intf == pn_data_intf_desc.bInterfaceNumber) {
 404                struct net_device *dev = fp->dev;
 405                struct phonet_port *port = netdev_priv(dev);
 406
 407                /* data intf (0: inactive, 1: active) */
 408                if (alt > 1)
 409                        return -EINVAL;
 410
 411                spin_lock(&port->lock);
 412
 413                if (fp->in_ep->enabled)
 414                        __pn_reset(f);
 415
 416                if (alt == 1) {
 417                        int i;
 418
 419                        if (config_ep_by_speed(gadget, f, fp->in_ep) ||
 420                            config_ep_by_speed(gadget, f, fp->out_ep)) {
 421                                fp->in_ep->desc = NULL;
 422                                fp->out_ep->desc = NULL;
 423                                spin_unlock(&port->lock);
 424                                return -EINVAL;
 425                        }
 426                        usb_ep_enable(fp->out_ep);
 427                        usb_ep_enable(fp->in_ep);
 428
 429                        port->usb = fp;
 430                        fp->out_ep->driver_data = fp;
 431                        fp->in_ep->driver_data = fp;
 432
 433                        netif_carrier_on(dev);
 434                        for (i = 0; i < phonet_rxq_size; i++)
 435                                pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
 436                }
 437                spin_unlock(&port->lock);
 438                return 0;
 439        }
 440
 441        return -EINVAL;
 442}
 443
 444static int pn_get_alt(struct usb_function *f, unsigned intf)
 445{
 446        struct f_phonet *fp = func_to_pn(f);
 447
 448        if (intf == pn_control_intf_desc.bInterfaceNumber)
 449                return 0;
 450
 451        if (intf == pn_data_intf_desc.bInterfaceNumber) {
 452                struct phonet_port *port = netdev_priv(fp->dev);
 453                u8 alt;
 454
 455                spin_lock(&port->lock);
 456                alt = port->usb != NULL;
 457                spin_unlock(&port->lock);
 458                return alt;
 459        }
 460
 461        return -EINVAL;
 462}
 463
 464static void pn_disconnect(struct usb_function *f)
 465{
 466        struct f_phonet *fp = func_to_pn(f);
 467        struct phonet_port *port = netdev_priv(fp->dev);
 468        unsigned long flags;
 469
 470        /* remain disabled until set_alt */
 471        spin_lock_irqsave(&port->lock, flags);
 472        __pn_reset(f);
 473        spin_unlock_irqrestore(&port->lock, flags);
 474}
 475
 476/*-------------------------------------------------------------------------*/
 477
 478static int pn_bind(struct usb_configuration *c, struct usb_function *f)
 479{
 480        struct usb_composite_dev *cdev = c->cdev;
 481        struct usb_gadget *gadget = cdev->gadget;
 482        struct f_phonet *fp = func_to_pn(f);
 483        struct usb_ep *ep;
 484        int status, i;
 485
 486        struct f_phonet_opts *phonet_opts;
 487
 488        phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst);
 489
 490        /*
 491         * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
 492         * configurations are bound in sequence with list_for_each_entry,
 493         * in each configuration its functions are bound in sequence
 494         * with list_for_each_entry, so we assume no race condition
 495         * with regard to phonet_opts->bound access
 496         */
 497        if (!phonet_opts->bound) {
 498                gphonet_set_gadget(phonet_opts->net, gadget);
 499                status = gphonet_register_netdev(phonet_opts->net);
 500                if (status)
 501                        return status;
 502                phonet_opts->bound = true;
 503        }
 504
 505        /* Reserve interface IDs */
 506        status = usb_interface_id(c, f);
 507        if (status < 0)
 508                goto err;
 509        pn_control_intf_desc.bInterfaceNumber = status;
 510        pn_union_desc.bMasterInterface0 = status;
 511
 512        status = usb_interface_id(c, f);
 513        if (status < 0)
 514                goto err;
 515        pn_data_nop_intf_desc.bInterfaceNumber = status;
 516        pn_data_intf_desc.bInterfaceNumber = status;
 517        pn_union_desc.bSlaveInterface0 = status;
 518
 519        /* Reserve endpoints */
 520        status = -ENODEV;
 521        ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
 522        if (!ep)
 523                goto err;
 524        fp->out_ep = ep;
 525
 526        ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
 527        if (!ep)
 528                goto err;
 529        fp->in_ep = ep;
 530
 531        pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
 532        pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
 533
 534        /* Do not try to bind Phonet twice... */
 535        status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
 536                        NULL, NULL);
 537        if (status)
 538                goto err;
 539
 540        /* Incoming USB requests */
 541        status = -ENOMEM;
 542        for (i = 0; i < phonet_rxq_size; i++) {
 543                struct usb_request *req;
 544
 545                req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
 546                if (!req)
 547                        goto err_req;
 548
 549                req->complete = pn_rx_complete;
 550                fp->out_reqv[i] = req;
 551        }
 552
 553        /* Outgoing USB requests */
 554        fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
 555        if (!fp->in_req)
 556                goto err_req;
 557
 558        INFO(cdev, "USB CDC Phonet function\n");
 559        INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
 560                fp->out_ep->name, fp->in_ep->name);
 561        return 0;
 562
 563err_req:
 564        for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
 565                usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
 566        usb_free_all_descriptors(f);
 567err:
 568        ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
 569        return status;
 570}
 571
 572static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item)
 573{
 574        return container_of(to_config_group(item), struct f_phonet_opts,
 575                        func_inst.group);
 576}
 577
 578static void phonet_attr_release(struct config_item *item)
 579{
 580        struct f_phonet_opts *opts = to_f_phonet_opts(item);
 581
 582        usb_put_function_instance(&opts->func_inst);
 583}
 584
 585static struct configfs_item_operations phonet_item_ops = {
 586        .release                = phonet_attr_release,
 587};
 588
 589static ssize_t f_phonet_ifname_show(struct config_item *item, char *page)
 590{
 591        return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE);
 592}
 593
 594CONFIGFS_ATTR_RO(f_phonet_, ifname);
 595
 596static struct configfs_attribute *phonet_attrs[] = {
 597        &f_phonet_attr_ifname,
 598        NULL,
 599};
 600
 601static const struct config_item_type phonet_func_type = {
 602        .ct_item_ops    = &phonet_item_ops,
 603        .ct_attrs       = phonet_attrs,
 604        .ct_owner       = THIS_MODULE,
 605};
 606
 607static void phonet_free_inst(struct usb_function_instance *f)
 608{
 609        struct f_phonet_opts *opts;
 610
 611        opts = container_of(f, struct f_phonet_opts, func_inst);
 612        if (opts->bound)
 613                gphonet_cleanup(opts->net);
 614        else
 615                free_netdev(opts->net);
 616        kfree(opts);
 617}
 618
 619static struct usb_function_instance *phonet_alloc_inst(void)
 620{
 621        struct f_phonet_opts *opts;
 622
 623        opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 624        if (!opts)
 625                return ERR_PTR(-ENOMEM);
 626
 627        opts->func_inst.free_func_inst = phonet_free_inst;
 628        opts->net = gphonet_setup_default();
 629        if (IS_ERR(opts->net)) {
 630                struct net_device *net = opts->net;
 631                kfree(opts);
 632                return ERR_CAST(net);
 633        }
 634
 635        config_group_init_type_name(&opts->func_inst.group, "",
 636                        &phonet_func_type);
 637
 638        return &opts->func_inst;
 639}
 640
 641static void phonet_free(struct usb_function *f)
 642{
 643        struct f_phonet *phonet;
 644
 645        phonet = func_to_pn(f);
 646        kfree(phonet);
 647}
 648
 649static void pn_unbind(struct usb_configuration *c, struct usb_function *f)
 650{
 651        struct f_phonet *fp = func_to_pn(f);
 652        int i;
 653
 654        /* We are already disconnected */
 655        if (fp->in_req)
 656                usb_ep_free_request(fp->in_ep, fp->in_req);
 657        for (i = 0; i < phonet_rxq_size; i++)
 658                if (fp->out_reqv[i])
 659                        usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
 660
 661        usb_free_all_descriptors(f);
 662}
 663
 664static struct usb_function *phonet_alloc(struct usb_function_instance *fi)
 665{
 666        struct f_phonet *fp;
 667        struct f_phonet_opts *opts;
 668        int size;
 669
 670        size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
 671        fp = kzalloc(size, GFP_KERNEL);
 672        if (!fp)
 673                return ERR_PTR(-ENOMEM);
 674
 675        opts = container_of(fi, struct f_phonet_opts, func_inst);
 676
 677        fp->dev = opts->net;
 678        fp->function.name = "phonet";
 679        fp->function.bind = pn_bind;
 680        fp->function.unbind = pn_unbind;
 681        fp->function.set_alt = pn_set_alt;
 682        fp->function.get_alt = pn_get_alt;
 683        fp->function.disable = pn_disconnect;
 684        fp->function.free_func = phonet_free;
 685        spin_lock_init(&fp->rx.lock);
 686
 687        return &fp->function;
 688}
 689
 690struct net_device *gphonet_setup_default(void)
 691{
 692        struct net_device *dev;
 693        struct phonet_port *port;
 694
 695        /* Create net device */
 696        dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN,
 697                           pn_net_setup);
 698        if (!dev)
 699                return ERR_PTR(-ENOMEM);
 700
 701        port = netdev_priv(dev);
 702        spin_lock_init(&port->lock);
 703        netif_carrier_off(dev);
 704
 705        return dev;
 706}
 707
 708void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g)
 709{
 710        SET_NETDEV_DEV(net, &g->dev);
 711}
 712
 713int gphonet_register_netdev(struct net_device *net)
 714{
 715        int status;
 716
 717        status = register_netdev(net);
 718        if (status)
 719                free_netdev(net);
 720
 721        return status;
 722}
 723
 724void gphonet_cleanup(struct net_device *dev)
 725{
 726        unregister_netdev(dev);
 727}
 728
 729DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc);
 730MODULE_AUTHOR("R\xC3\xA9mi Denis-Courmont");
 731MODULE_LICENSE("GPL");
 732