drivers/usb/gadget/function/f_phonet.c

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