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 int pn_net_mtu(struct net_device *dev, int new_mtu)
 265 {
 266         if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
 267                 return -EINVAL;
 268         dev->mtu = new_mtu;
 269         return 0;
 270 }
 271
 272 static const struct net_device_ops pn_netdev_ops = {
 273         .ndo_open       = pn_net_open,
 274         .ndo_stop       = pn_net_close,
 275         .ndo_start_xmit = pn_net_xmit,
 276         .ndo_change_mtu = pn_net_mtu,
 277 };
 278
 279 static void pn_net_setup(struct net_device *dev)
 280 {
 281         dev->features           = 0;
 282         dev->type               = ARPHRD_PHONET;
 283         dev->flags              = IFF_POINTOPOINT | IFF_NOARP;
 284         dev->mtu                = PHONET_DEV_MTU;
 285         dev->hard_header_len    = 1;
 286         dev->dev_addr[0]        = PN_MEDIA_USB;
 287         dev->addr_len           = 1;
 288         dev->tx_queue_len       = 1;
 289
 290         dev->netdev_ops         = &pn_netdev_ops;
 291         dev->destructor         = free_netdev;
 292         dev->header_ops         = &phonet_header_ops;
 293 }
 294
 295 /*-------------------------------------------------------------------------*/
 296
 297 /*
 298  * Queue buffer for data from the host
 299  */
 300 static int
 301 pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
 302 {
 303         struct page *page;
 304         int err;
 305
 306         page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
 307         if (!page)
 308                 return -ENOMEM;
 309
 310         req->buf = page_address(page);
 311         req->length = PAGE_SIZE;
 312         req->context = page;
 313
 314         err = usb_ep_queue(fp->out_ep, req, gfp_flags);
 315         if (unlikely(err))
 316                 put_page(page);
 317         return err;
 318 }
 319
 320 static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
 321 {
 322         struct f_phonet *fp = ep->driver_data;
 323         struct net_device *dev = fp->dev;
 324         struct page *page = req->context;
 325         struct sk_buff *skb;
 326         unsigned long flags;
 327         int status = req->status;
 328
 329         switch (status) {
 330         case 0:
 331                 spin_lock_irqsave(&fp->rx.lock, flags);
 332                 skb = fp->rx.skb;
 333                 if (!skb)
 334                         skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
 335                 if (req->actual < req->length) /* Last fragment */
 336                         fp->rx.skb = NULL;
 337                 spin_unlock_irqrestore(&fp->rx.lock, flags);
 338
 339                 if (unlikely(!skb))
 340                         break;
 341
 342                 if (skb->len == 0) { /* First fragment */
 343                         skb->protocol = htons(ETH_P_PHONET);
 344                         skb_reset_mac_header(skb);
 345                         /* Can't use pskb_pull() on page in IRQ */
 346                         memcpy(skb_put(skb, 1), page_address(page), 1);
 347                 }
 348
 349                 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
 350                                 skb->len <= 1, req->actual, PAGE_SIZE);
 351                 page = NULL;
 352
 353                 if (req->actual < req->length) { /* Last fragment */
 354                         skb->dev = dev;
 355                         dev->stats.rx_packets++;
 356                         dev->stats.rx_bytes += skb->len;
 357
 358                         netif_rx(skb);
 359                 }
 360                 break;
 361
 362         /* Do not resubmit in these cases: */
 363         case -ESHUTDOWN: /* disconnect */
 364         case -ECONNABORTED: /* hw reset */
 365         case -ECONNRESET: /* dequeued (unlink or netif down) */
 366                 req = NULL;
 367                 break;
 368
 369         /* Do resubmit in these cases: */
 370         case -EOVERFLOW: /* request buffer overflow */
 371                 dev->stats.rx_over_errors++;
 372         default:
 373                 dev->stats.rx_errors++;
 374                 break;
 375         }
 376
 377         if (page)
 378                 put_page(page);
 379         if (req)
 380                 pn_rx_submit(fp, req, GFP_ATOMIC);
 381 }
 382
 383 /*-------------------------------------------------------------------------*/
 384
 385 static void __pn_reset(struct usb_function *f)
 386 {
 387         struct f_phonet *fp = func_to_pn(f);
 388         struct net_device *dev = fp->dev;
 389         struct phonet_port *port = netdev_priv(dev);
 390
 391         netif_carrier_off(dev);
 392         port->usb = NULL;
 393
 394         usb_ep_disable(fp->out_ep);
 395         usb_ep_disable(fp->in_ep);
 396         if (fp->rx.skb) {
 397                 dev_kfree_skb_irq(fp->rx.skb);
 398                 fp->rx.skb = NULL;
 399         }
 400 }
 401
 402 static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 403 {
 404         struct f_phonet *fp = func_to_pn(f);
 405         struct usb_gadget *gadget = fp->function.config->cdev->gadget;
 406
 407         if (intf == pn_control_intf_desc.bInterfaceNumber)
 408                 /* control interface, no altsetting */
 409                 return (alt > 0) ? -EINVAL : 0;
 410
 411         if (intf == pn_data_intf_desc.bInterfaceNumber) {
 412                 struct net_device *dev = fp->dev;
 413                 struct phonet_port *port = netdev_priv(dev);
 414
 415                 /* data intf (0: inactive, 1: active) */
 416                 if (alt > 1)
 417                         return -EINVAL;
 418
 419                 spin_lock(&port->lock);
 420
 421                 if (fp->in_ep->enabled)
 422                         __pn_reset(f);
 423
 424                 if (alt == 1) {
 425                         int i;
 426
 427                         if (config_ep_by_speed(gadget, f, fp->in_ep) ||
 428                             config_ep_by_speed(gadget, f, fp->out_ep)) {
 429                                 fp->in_ep->desc = NULL;
 430                                 fp->out_ep->desc = NULL;
 431                                 spin_unlock(&port->lock);
 432                                 return -EINVAL;
 433                         }
 434                         usb_ep_enable(fp->out_ep);
 435                         usb_ep_enable(fp->in_ep);
 436
 437                         port->usb = fp;
 438                         fp->out_ep->driver_data = fp;
 439                         fp->in_ep->driver_data = fp;
 440
 441                         netif_carrier_on(dev);
 442                         for (i = 0; i < phonet_rxq_size; i++)
 443                                 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
 444                 }
 445                 spin_unlock(&port->lock);
 446                 return 0;
 447         }
 448
 449         return -EINVAL;
 450 }
 451
 452 static int pn_get_alt(struct usb_function *f, unsigned intf)
 453 {
 454         struct f_phonet *fp = func_to_pn(f);
 455
 456         if (intf == pn_control_intf_desc.bInterfaceNumber)
 457                 return 0;
 458
 459         if (intf == pn_data_intf_desc.bInterfaceNumber) {
 460                 struct phonet_port *port = netdev_priv(fp->dev);
 461                 u8 alt;
 462
 463                 spin_lock(&port->lock);
 464                 alt = port->usb != NULL;
 465                 spin_unlock(&port->lock);
 466                 return alt;
 467         }
 468
 469         return -EINVAL;
 470 }
 471
 472 static void pn_disconnect(struct usb_function *f)
 473 {
 474         struct f_phonet *fp = func_to_pn(f);
 475         struct phonet_port *port = netdev_priv(fp->dev);
 476         unsigned long flags;
 477
 478         /* remain disabled until set_alt */
 479         spin_lock_irqsave(&port->lock, flags);
 480         __pn_reset(f);
 481         spin_unlock_irqrestore(&port->lock, flags);
 482 }
 483
 484 /*-------------------------------------------------------------------------*/
 485
 486 static int pn_bind(struct usb_configuration *c, struct usb_function *f)
 487 {
 488         struct usb_composite_dev *cdev = c->cdev;
 489         struct usb_gadget *gadget = cdev->gadget;
 490         struct f_phonet *fp = func_to_pn(f);
 491         struct usb_ep *ep;
 492         int status, i;
 493
 494         struct f_phonet_opts *phonet_opts;
 495
 496         phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst);
 497
 498         /*
 499          * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
 500          * configurations are bound in sequence with list_for_each_entry,
 501          * in each configuration its functions are bound in sequence
 502          * with list_for_each_entry, so we assume no race condition
 503          * with regard to phonet_opts->bound access
 504          */
 505         if (!phonet_opts->bound) {
 506                 gphonet_set_gadget(phonet_opts->net, gadget);
 507                 status = gphonet_register_netdev(phonet_opts->net);
 508                 if (status)
 509                         return status;
 510                 phonet_opts->bound = true;
 511         }
 512
 513         /* Reserve interface IDs */
 514         status = usb_interface_id(c, f);
 515         if (status < 0)
 516                 goto err;
 517         pn_control_intf_desc.bInterfaceNumber = status;
 518         pn_union_desc.bMasterInterface0 = status;
 519
 520         status = usb_interface_id(c, f);
 521         if (status < 0)
 522                 goto err;
 523         pn_data_nop_intf_desc.bInterfaceNumber = status;
 524         pn_data_intf_desc.bInterfaceNumber = status;
 525         pn_union_desc.bSlaveInterface0 = status;
 526
 527         /* Reserve endpoints */
 528         status = -ENODEV;
 529         ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
 530         if (!ep)
 531                 goto err;
 532         fp->out_ep = ep;
 533
 534         ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
 535         if (!ep)
 536                 goto err;
 537         fp->in_ep = ep;
 538
 539         pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
 540         pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
 541
 542         /* Do not try to bind Phonet twice... */
 543         status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
 544                         NULL);
 545         if (status)
 546                 goto err;
 547
 548         /* Incoming USB requests */
 549         status = -ENOMEM;
 550         for (i = 0; i < phonet_rxq_size; i++) {
 551                 struct usb_request *req;
 552
 553                 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
 554                 if (!req)
 555                         goto err_req;
 556
 557                 req->complete = pn_rx_complete;
 558                 fp->out_reqv[i] = req;
 559         }
 560
 561         /* Outgoing USB requests */
 562         fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
 563         if (!fp->in_req)
 564                 goto err_req;
 565
 566         INFO(cdev, "USB CDC Phonet function\n");
 567         INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
 568                 fp->out_ep->name, fp->in_ep->name);
 569         return 0;
 570
 571 err_req:
 572         for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
 573                 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
 574         usb_free_all_descriptors(f);
 575 err:
 576         ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
 577         return status;
 578 }
 579
 580 static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item)
 581 {
 582         return container_of(to_config_group(item), struct f_phonet_opts,
 583                         func_inst.group);
 584 }
 585
 586 CONFIGFS_ATTR_STRUCT(f_phonet_opts);
 587 static ssize_t f_phonet_attr_show(struct config_item *item,
 588                                 struct configfs_attribute *attr,
 589                                 char *page)
 590 {
 591         struct f_phonet_opts *opts = to_f_phonet_opts(item);
 592         struct f_phonet_opts_attribute *f_phonet_opts_attr =
 593                 container_of(attr, struct f_phonet_opts_attribute, attr);
 594         ssize_t ret = 0;
 595
 596         if (f_phonet_opts_attr->show)
 597                 ret = f_phonet_opts_attr->show(opts, page);
 598         return ret;
 599 }
 600
 601 static void phonet_attr_release(struct config_item *item)
 602 {
 603         struct f_phonet_opts *opts = to_f_phonet_opts(item);
 604
 605         usb_put_function_instance(&opts->func_inst);
 606 }
 607
 608 static struct configfs_item_operations phonet_item_ops = {
 609         .release                = phonet_attr_release,
 610         .show_attribute         = f_phonet_attr_show,
 611 };
 612
 613 static ssize_t f_phonet_ifname_show(struct f_phonet_opts *opts, char *page)
 614 {
 615         return gether_get_ifname(opts->net, page, PAGE_SIZE);
 616 }
 617
 618 static struct f_phonet_opts_attribute f_phonet_ifname =
 619         __CONFIGFS_ATTR_RO(ifname, f_phonet_ifname_show);
 620
 621 static struct configfs_attribute *phonet_attrs[] = {
 622         &f_phonet_ifname.attr,
 623         NULL,
 624 };
 625
 626 static struct config_item_type phonet_func_type = {
 627         .ct_item_ops    = &phonet_item_ops,
 628         .ct_attrs       = phonet_attrs,
 629         .ct_owner       = THIS_MODULE,
 630 };
 631
 632 static void phonet_free_inst(struct usb_function_instance *f)
 633 {
 634         struct f_phonet_opts *opts;
 635
 636         opts = container_of(f, struct f_phonet_opts, func_inst);
 637         if (opts->bound)
 638                 gphonet_cleanup(opts->net);
 639         else
 640                 free_netdev(opts->net);
 641         kfree(opts);
 642 }
 643
 644 static struct usb_function_instance *phonet_alloc_inst(void)
 645 {
 646         struct f_phonet_opts *opts;
 647
 648         opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 649         if (!opts)
 650                 return ERR_PTR(-ENOMEM);
 651
 652         opts->func_inst.free_func_inst = phonet_free_inst;
 653         opts->net = gphonet_setup_default();
 654         if (IS_ERR(opts->net)) {
 655                 struct net_device *net = opts->net;
 656                 kfree(opts);
 657                 return ERR_CAST(net);
 658         }
 659
 660         config_group_init_type_name(&opts->func_inst.group, "",
 661                         &phonet_func_type);
 662
 663         return &opts->func_inst;
 664 }
 665
 666 static void phonet_free(struct usb_function *f)
 667 {
 668         struct f_phonet *phonet;
 669
 670         phonet = func_to_pn(f);
 671         kfree(phonet);
 672 }
 673
 674 static void pn_unbind(struct usb_configuration *c, struct usb_function *f)
 675 {
 676         struct f_phonet *fp = func_to_pn(f);
 677         int i;
 678
 679         /* We are already disconnected */
 680         if (fp->in_req)
 681                 usb_ep_free_request(fp->in_ep, fp->in_req);
 682         for (i = 0; i < phonet_rxq_size; i++)
 683                 if (fp->out_reqv[i])
 684                         usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
 685
 686         usb_free_all_descriptors(f);
 687 }
 688
 689 static struct usb_function *phonet_alloc(struct usb_function_instance *fi)
 690 {
 691         struct f_phonet *fp;
 692         struct f_phonet_opts *opts;
 693         int size;
 694
 695         size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
 696         fp = kzalloc(size, GFP_KERNEL);
 697         if (!fp)
 698                 return ERR_PTR(-ENOMEM);
 699
 700         opts = container_of(fi, struct f_phonet_opts, func_inst);
 701
 702         fp->dev = opts->net;
 703         fp->function.name = "phonet";
 704         fp->function.bind = pn_bind;
 705         fp->function.unbind = pn_unbind;
 706         fp->function.set_alt = pn_set_alt;
 707         fp->function.get_alt = pn_get_alt;
 708         fp->function.disable = pn_disconnect;
 709         fp->function.free_func = phonet_free;
 710         spin_lock_init(&fp->rx.lock);
 711
 712         return &fp->function;
 713 }
 714
 715 struct net_device *gphonet_setup_default(void)
 716 {
 717         struct net_device *dev;
 718         struct phonet_port *port;
 719
 720         /* Create net device */
 721         dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN,
 722                            pn_net_setup);
 723         if (!dev)
 724                 return ERR_PTR(-ENOMEM);
 725
 726         port = netdev_priv(dev);
 727         spin_lock_init(&port->lock);
 728         netif_carrier_off(dev);
 729
 730         return dev;
 731 }
 732
 733 void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g)
 734 {
 735         SET_NETDEV_DEV(net, &g->dev);
 736 }
 737
 738 int gphonet_register_netdev(struct net_device *net)
 739 {
 740         int status;
 741
 742         status = register_netdev(net);
 743         if (status)
 744                 free_netdev(net);
 745
 746         return status;
 747 }
 748
 749 void gphonet_cleanup(struct net_device *dev)
 750 {
 751         unregister_netdev(dev);
 752 }
 753
 754 DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc);
 755 MODULE_AUTHOR("Rémi Denis-Courmont");
 756 MODULE_LICENSE("GPL");