drivers/net/usb/ipheth.c

   1 /*
   2  * ipheth.c - Apple iPhone USB Ethernet driver
   3  *
   4  * Copyright (c) 2009 Diego Giagio <diego@giagio.com>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of GIAGIO.COM nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * Alternatively, provided that this notice is retained in full, this
  20  * software may be distributed under the terms of the GNU General
  21  * Public License ("GPL") version 2, in which case the provisions of the
  22  * GPL apply INSTEAD OF those given above.
  23  *
  24  * The provided data structures and external interfaces from this code
  25  * are not restricted to be used by modules with a GPL compatible license.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  31  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  32  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  33  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  37  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  38  * DAMAGE.
  39  *
  40  *
  41  * Attention: iPhone device must be paired, otherwise it won't respond to our
  42  * driver. For more info: http://giagio.com/wiki/moin.cgi/iPhoneEthernetDriver
  43  *
  44  */
  45
  46 #include <linux/kernel.h>
  47 #include <linux/errno.h>
  48 #include <linux/init.h>
  49 #include <linux/slab.h>
  50 #include <linux/module.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/etherdevice.h>
  53 #include <linux/ethtool.h>
  54 #include <linux/usb.h>
  55 #include <linux/workqueue.h>
  56
  57 #define USB_VENDOR_APPLE        0x05ac
  58 #define USB_PRODUCT_IPHONE      0x1290
  59 #define USB_PRODUCT_IPHONE_3G   0x1292
  60 #define USB_PRODUCT_IPHONE_3GS  0x1294
  61 #define USB_PRODUCT_IPHONE_4    0x1297
  62
  63 #define IPHETH_USBINTF_CLASS    255
  64 #define IPHETH_USBINTF_SUBCLASS 253
  65 #define IPHETH_USBINTF_PROTO    1
  66
  67 #define IPHETH_BUF_SIZE         1516
  68 #define IPHETH_IP_ALIGN         2       /* padding at front of URB */
  69 #define IPHETH_TX_TIMEOUT       (5 * HZ)
  70
  71 #define IPHETH_INTFNUM          2
  72 #define IPHETH_ALT_INTFNUM      1
  73
  74 #define IPHETH_CTRL_ENDP        0x00
  75 #define IPHETH_CTRL_BUF_SIZE    0x40
  76 #define IPHETH_CTRL_TIMEOUT     (5 * HZ)
  77
  78 #define IPHETH_CMD_GET_MACADDR   0x00
  79 #define IPHETH_CMD_CARRIER_CHECK 0x45
  80
  81 #define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
  82 #define IPHETH_CARRIER_ON       0x04
  83
  84 static struct usb_device_id ipheth_table[] = {
  85         { USB_DEVICE_AND_INTERFACE_INFO(
  86                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
  87                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
  88                 IPHETH_USBINTF_PROTO) },
  89         { USB_DEVICE_AND_INTERFACE_INFO(
  90                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3G,
  91                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
  92                 IPHETH_USBINTF_PROTO) },
  93         { USB_DEVICE_AND_INTERFACE_INFO(
  94                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3GS,
  95                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
  96                 IPHETH_USBINTF_PROTO) },
  97         { USB_DEVICE_AND_INTERFACE_INFO(
  98                 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4,
  99                 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
 100                 IPHETH_USBINTF_PROTO) },
 101         { }
 102 };
 103 MODULE_DEVICE_TABLE(usb, ipheth_table);
 104
 105 struct ipheth_device {
 106         struct usb_device *udev;
 107         struct usb_interface *intf;
 108         struct net_device *net;
 109         struct sk_buff *tx_skb;
 110         struct urb *tx_urb;
 111         struct urb *rx_urb;
 112         unsigned char *tx_buf;
 113         unsigned char *rx_buf;
 114         unsigned char *ctrl_buf;
 115         u8 bulk_in;
 116         u8 bulk_out;
 117         struct delayed_work carrier_work;
 118 };
 119
 120 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);
 121
 122 static int ipheth_alloc_urbs(struct ipheth_device *iphone)
 123 {
 124         struct urb *tx_urb = NULL;
 125         struct urb *rx_urb = NULL;
 126         u8 *tx_buf = NULL;
 127         u8 *rx_buf = NULL;
 128
 129         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 130         if (tx_urb == NULL)
 131                 goto error_nomem;
 132
 133         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 134         if (rx_urb == NULL)
 135                 goto free_tx_urb;
 136
 137         tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
 138                                     GFP_KERNEL, &tx_urb->transfer_dma);
 139         if (tx_buf == NULL)
 140                 goto free_rx_urb;
 141
 142         rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
 143                                     GFP_KERNEL, &rx_urb->transfer_dma);
 144         if (rx_buf == NULL)
 145                 goto free_tx_buf;
 146
 147
 148         iphone->tx_urb = tx_urb;
 149         iphone->rx_urb = rx_urb;
 150         iphone->tx_buf = tx_buf;
 151         iphone->rx_buf = rx_buf;
 152         return 0;
 153
 154 free_tx_buf:
 155         usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
 156                           tx_urb->transfer_dma);
 157 free_rx_urb:
 158         usb_free_urb(rx_urb);
 159 free_tx_urb:
 160         usb_free_urb(tx_urb);
 161 error_nomem:
 162         return -ENOMEM;
 163 }
 164
 165 static void ipheth_free_urbs(struct ipheth_device *iphone)
 166 {
 167         usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
 168                           iphone->rx_urb->transfer_dma);
 169         usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->tx_buf,
 170                           iphone->tx_urb->transfer_dma);
 171         usb_free_urb(iphone->rx_urb);
 172         usb_free_urb(iphone->tx_urb);
 173 }
 174
 175 static void ipheth_kill_urbs(struct ipheth_device *dev)
 176 {
 177         usb_kill_urb(dev->tx_urb);
 178         usb_kill_urb(dev->rx_urb);
 179 }
 180
 181 static void ipheth_rcvbulk_callback(struct urb *urb)
 182 {
 183         struct ipheth_device *dev;
 184         struct sk_buff *skb;
 185         int status;
 186         char *buf;
 187         int len;
 188
 189         dev = urb->context;
 190         if (dev == NULL)
 191                 return;
 192
 193         status = urb->status;
 194         switch (status) {
 195         case -ENOENT:
 196         case -ECONNRESET:
 197         case -ESHUTDOWN:
 198                 return;
 199         case 0:
 200                 break;
 201         default:
 202                 err("%s: urb status: %d", __func__, status);
 203                 return;
 204         }
 205
 206         if (urb->actual_length <= IPHETH_IP_ALIGN) {
 207                 dev->net->stats.rx_length_errors++;
 208                 return;
 209         }
 210         len = urb->actual_length - IPHETH_IP_ALIGN;
 211         buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
 212
 213         skb = dev_alloc_skb(len);
 214         if (!skb) {
 215                 err("%s: dev_alloc_skb: -ENOMEM", __func__);
 216                 dev->net->stats.rx_dropped++;
 217                 return;
 218         }
 219
 220         memcpy(skb_put(skb, len), buf, len);
 221         skb->dev = dev->net;
 222         skb->protocol = eth_type_trans(skb, dev->net);
 223
 224         dev->net->stats.rx_packets++;
 225         dev->net->stats.rx_bytes += len;
 226
 227         netif_rx(skb);
 228         ipheth_rx_submit(dev, GFP_ATOMIC);
 229 }
 230
 231 static void ipheth_sndbulk_callback(struct urb *urb)
 232 {
 233         struct ipheth_device *dev;
 234         int status = urb->status;
 235
 236         dev = urb->context;
 237         if (dev == NULL)
 238                 return;
 239
 240         if (status != 0 &&
 241             status != -ENOENT &&
 242             status != -ECONNRESET &&
 243             status != -ESHUTDOWN)
 244                 err("%s: urb status: %d", __func__, status);
 245
 246         dev_kfree_skb_irq(dev->tx_skb);
 247         netif_wake_queue(dev->net);
 248 }
 249
 250 static int ipheth_carrier_set(struct ipheth_device *dev)
 251 {
 252         struct usb_device *udev = dev->udev;
 253         int retval;
 254
 255         retval = usb_control_msg(udev,
 256                         usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
 257                         IPHETH_CMD_CARRIER_CHECK, /* request */
 258                         0xc0, /* request type */
 259                         0x00, /* value */
 260                         0x02, /* index */
 261                         dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
 262                         IPHETH_CTRL_TIMEOUT);
 263         if (retval < 0) {
 264                 err("%s: usb_control_msg: %d", __func__, retval);
 265                 return retval;
 266         }
 267
 268         if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON)
 269                 netif_carrier_on(dev->net);
 270         else
 271                 netif_carrier_off(dev->net);
 272
 273         return 0;
 274 }
 275
 276 static void ipheth_carrier_check_work(struct work_struct *work)
 277 {
 278         struct ipheth_device *dev = container_of(work, struct ipheth_device,
 279                                                  carrier_work.work);
 280
 281         ipheth_carrier_set(dev);
 282         schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
 283 }
 284
 285 static int ipheth_get_macaddr(struct ipheth_device *dev)
 286 {
 287         struct usb_device *udev = dev->udev;
 288         struct net_device *net = dev->net;
 289         int retval;
 290
 291         retval = usb_control_msg(udev,
 292                                  usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
 293                                  IPHETH_CMD_GET_MACADDR, /* request */
 294                                  0xc0, /* request type */
 295                                  0x00, /* value */
 296                                  0x02, /* index */
 297                                  dev->ctrl_buf,
 298                                  IPHETH_CTRL_BUF_SIZE,
 299                                  IPHETH_CTRL_TIMEOUT);
 300         if (retval < 0) {
 301                 err("%s: usb_control_msg: %d", __func__, retval);
 302         } else if (retval < ETH_ALEN) {
 303                 err("%s: usb_control_msg: short packet: %d bytes",
 304                         __func__, retval);
 305                 retval = -EINVAL;
 306         } else {
 307                 memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
 308                 retval = 0;
 309         }
 310
 311         return retval;
 312 }
 313
 314 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
 315 {
 316         struct usb_device *udev = dev->udev;
 317         int retval;
 318
 319         usb_fill_bulk_urb(dev->rx_urb, udev,
 320                           usb_rcvbulkpipe(udev, dev->bulk_in),
 321                           dev->rx_buf, IPHETH_BUF_SIZE,
 322                           ipheth_rcvbulk_callback,
 323                           dev);
 324         dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 325
 326         retval = usb_submit_urb(dev->rx_urb, mem_flags);
 327         if (retval)
 328                 err("%s: usb_submit_urb: %d", __func__, retval);
 329         return retval;
 330 }
 331
 332 static int ipheth_open(struct net_device *net)
 333 {
 334         struct ipheth_device *dev = netdev_priv(net);
 335         struct usb_device *udev = dev->udev;
 336         int retval = 0;
 337
 338         usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
 339
 340         retval = ipheth_carrier_set(dev);
 341         if (retval)
 342                 return retval;
 343
 344         retval = ipheth_rx_submit(dev, GFP_KERNEL);
 345         if (retval)
 346                 return retval;
 347
 348         schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
 349         netif_start_queue(net);
 350         return retval;
 351 }
 352
 353 static int ipheth_close(struct net_device *net)
 354 {
 355         struct ipheth_device *dev = netdev_priv(net);
 356
 357         cancel_delayed_work_sync(&dev->carrier_work);
 358         netif_stop_queue(net);
 359         return 0;
 360 }
 361
 362 static int ipheth_tx(struct sk_buff *skb, struct net_device *net)
 363 {
 364         struct ipheth_device *dev = netdev_priv(net);
 365         struct usb_device *udev = dev->udev;
 366         int retval;
 367
 368         /* Paranoid */
 369         if (skb->len > IPHETH_BUF_SIZE) {
 370                 WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
 371                 dev->net->stats.tx_dropped++;
 372                 dev_kfree_skb_irq(skb);
 373                 return NETDEV_TX_OK;
 374         }
 375
 376         memcpy(dev->tx_buf, skb->data, skb->len);
 377         if (skb->len < IPHETH_BUF_SIZE)
 378                 memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);
 379
 380         usb_fill_bulk_urb(dev->tx_urb, udev,
 381                           usb_sndbulkpipe(udev, dev->bulk_out),
 382                           dev->tx_buf, IPHETH_BUF_SIZE,
 383                           ipheth_sndbulk_callback,
 384                           dev);
 385         dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 386
 387         retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
 388         if (retval) {
 389                 err("%s: usb_submit_urb: %d", __func__, retval);
 390                 dev->net->stats.tx_errors++;
 391                 dev_kfree_skb_irq(skb);
 392         } else {
 393                 dev->tx_skb = skb;
 394
 395                 dev->net->stats.tx_packets++;
 396                 dev->net->stats.tx_bytes += skb->len;
 397                 netif_stop_queue(net);
 398         }
 399
 400         return NETDEV_TX_OK;
 401 }
 402
 403 static void ipheth_tx_timeout(struct net_device *net)
 404 {
 405         struct ipheth_device *dev = netdev_priv(net);
 406
 407         err("%s: TX timeout", __func__);
 408         dev->net->stats.tx_errors++;
 409         usb_unlink_urb(dev->tx_urb);
 410 }
 411
 412 static struct net_device_stats *ipheth_stats(struct net_device *net)
 413 {
 414         struct ipheth_device *dev = netdev_priv(net);
 415         return &dev->net->stats;
 416 }
 417
 418 static u32 ipheth_ethtool_op_get_link(struct net_device *net)
 419 {
 420         struct ipheth_device *dev = netdev_priv(net);
 421         return netif_carrier_ok(dev->net);
 422 }
 423
 424 static struct ethtool_ops ops = {
 425         .get_link = ipheth_ethtool_op_get_link
 426 };
 427
 428 static const struct net_device_ops ipheth_netdev_ops = {
 429         .ndo_open = &ipheth_open,
 430         .ndo_stop = &ipheth_close,
 431         .ndo_start_xmit = &ipheth_tx,
 432         .ndo_tx_timeout = &ipheth_tx_timeout,
 433         .ndo_get_stats = &ipheth_stats,
 434 };
 435
 436 static int ipheth_probe(struct usb_interface *intf,
 437                         const struct usb_device_id *id)
 438 {
 439         struct usb_device *udev = interface_to_usbdev(intf);
 440         struct usb_host_interface *hintf;
 441         struct usb_endpoint_descriptor *endp;
 442         struct ipheth_device *dev;
 443         struct net_device *netdev;
 444         int i;
 445         int retval;
 446
 447         netdev = alloc_etherdev(sizeof(struct ipheth_device));
 448         if (!netdev)
 449                 return -ENOMEM;
 450
 451         netdev->netdev_ops = &ipheth_netdev_ops;
 452         netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
 453         strcpy(netdev->name, "eth%d");
 454
 455         dev = netdev_priv(netdev);
 456         dev->udev = udev;
 457         dev->net = netdev;
 458         dev->intf = intf;
 459
 460         /* Set up endpoints */
 461         hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
 462         if (hintf == NULL) {
 463                 retval = -ENODEV;
 464                 err("Unable to find alternate settings interface");
 465                 goto err_endpoints;
 466         }
 467
 468         for (i = 0; i < hintf->desc.bNumEndpoints; i++) {
 469                 endp = &hintf->endpoint[i].desc;
 470                 if (usb_endpoint_is_bulk_in(endp))
 471                         dev->bulk_in = endp->bEndpointAddress;
 472                 else if (usb_endpoint_is_bulk_out(endp))
 473                         dev->bulk_out = endp->bEndpointAddress;
 474         }
 475         if (!(dev->bulk_in && dev->bulk_out)) {
 476                 retval = -ENODEV;
 477                 err("Unable to find endpoints");
 478                 goto err_endpoints;
 479         }
 480
 481         dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
 482         if (dev->ctrl_buf == NULL) {
 483                 retval = -ENOMEM;
 484                 goto err_alloc_ctrl_buf;
 485         }
 486
 487         retval = ipheth_get_macaddr(dev);
 488         if (retval)
 489                 goto err_get_macaddr;
 490
 491         INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
 492
 493         retval = ipheth_alloc_urbs(dev);
 494         if (retval) {
 495                 err("error allocating urbs: %d", retval);
 496                 goto err_alloc_urbs;
 497         }
 498
 499         usb_set_intfdata(intf, dev);
 500
 501         SET_NETDEV_DEV(netdev, &intf->dev);
 502         SET_ETHTOOL_OPS(netdev, &ops);
 503
 504         retval = register_netdev(netdev);
 505         if (retval) {
 506                 err("error registering netdev: %d", retval);
 507                 retval = -EIO;
 508                 goto err_register_netdev;
 509         }
 510
 511         dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
 512         return 0;
 513
 514 err_register_netdev:
 515         ipheth_free_urbs(dev);
 516 err_alloc_urbs:
 517 err_get_macaddr:
 518 err_alloc_ctrl_buf:
 519         kfree(dev->ctrl_buf);
 520 err_endpoints:
 521         free_netdev(netdev);
 522         return retval;
 523 }
 524
 525 static void ipheth_disconnect(struct usb_interface *intf)
 526 {
 527         struct ipheth_device *dev;
 528
 529         dev = usb_get_intfdata(intf);
 530         if (dev != NULL) {
 531                 unregister_netdev(dev->net);
 532                 ipheth_kill_urbs(dev);
 533                 ipheth_free_urbs(dev);
 534                 kfree(dev->ctrl_buf);
 535                 free_netdev(dev->net);
 536         }
 537         usb_set_intfdata(intf, NULL);
 538         dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
 539 }
 540
 541 static struct usb_driver ipheth_driver = {
 542         .name =         "ipheth",
 543         .probe =        ipheth_probe,
 544         .disconnect =   ipheth_disconnect,
 545         .id_table =     ipheth_table,
 546 };
 547
 548 static int __init ipheth_init(void)
 549 {
 550         int retval;
 551
 552         retval = usb_register(&ipheth_driver);
 553         if (retval) {
 554                 err("usb_register failed: %d", retval);
 555                 return retval;
 556         }
 557         return 0;
 558 }
 559
 560 static void __exit ipheth_exit(void)
 561 {
 562         usb_deregister(&ipheth_driver);
 563 }
 564
 565 module_init(ipheth_init);
 566 module_exit(ipheth_exit);
 567
 568 MODULE_AUTHOR("Diego Giagio <diego@giagio.com>");
 569 MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
 570 MODULE_LICENSE("Dual BSD/GPL");