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/slab.h> 49 #include <linux/module.h> 50 #include <linux/netdevice.h> 51 #include <linux/etherdevice.h> 52 #include <linux/ethtool.h> 53 #include <linux/usb.h> 54 #include <linux/workqueue.h> 55 #include <linux/usb/cdc.h> 56 57 #define USB_VENDOR_APPLE 0x05ac 58 59 #define IPHETH_USBINTF_CLASS 255 60 #define IPHETH_USBINTF_SUBCLASS 253 61 #define IPHETH_USBINTF_PROTO 1 62 63 #define IPHETH_IP_ALIGN 2 /* padding at front of URB */ 64 #define IPHETH_NCM_HEADER_SIZE (12 + 96) /* NCMH + NCM0 */ 65 #define IPHETH_TX_BUF_SIZE ETH_FRAME_LEN 66 #define IPHETH_RX_BUF_SIZE_LEGACY (IPHETH_IP_ALIGN + ETH_FRAME_LEN) 67 #define IPHETH_RX_BUF_SIZE_NCM 65536 68 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_ENABLE_NCM 0x04 80 #define IPHETH_CMD_CARRIER_CHECK 0x45 81 82 #define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ) 83 #define IPHETH_CARRIER_ON 0x04 84 85 static const struct usb_device_id ipheth_table[] = { 86 { USB_VENDOR_AND_INTERFACE_INFO(USB_VENDOR_APPLE, IPHETH_USBINTF_CLASS, 87 IPHETH_USBINTF_SUBCLASS, 88 IPHETH_USBINTF_PROTO) }, 89 { } 90 }; 91 MODULE_DEVICE_TABLE(usb, ipheth_table); 92 93 struct ipheth_device { 94 struct usb_device *udev; 95 struct usb_interface *intf; 96 struct net_device *net; 97 struct urb *tx_urb; 98 struct urb *rx_urb; 99 unsigned char *tx_buf; 100 unsigned char *rx_buf; 101 unsigned char *ctrl_buf; 102 u8 bulk_in; 103 u8 bulk_out; 104 struct delayed_work carrier_work; 105 bool confirmed_pairing; 106 int (*rcvbulk_callback)(struct urb *urb); 107 size_t rx_buf_len; 108 }; 109 110 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags); 111 112 static int ipheth_alloc_urbs(struct ipheth_device *iphone) 113 { 114 struct urb *tx_urb = NULL; 115 struct urb *rx_urb = NULL; 116 u8 *tx_buf = NULL; 117 u8 *rx_buf = NULL; 118 119 tx_urb = usb_alloc_urb(0, GFP_KERNEL); 120 if (tx_urb == NULL) 121 goto error_nomem; 122 123 rx_urb = usb_alloc_urb(0, GFP_KERNEL); 124 if (rx_urb == NULL) 125 goto free_tx_urb; 126 127 tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, 128 GFP_KERNEL, &tx_urb->transfer_dma); 129 if (tx_buf == NULL) 130 goto free_rx_urb; 131 132 rx_buf = usb_alloc_coherent(iphone->udev, iphone->rx_buf_len, 133 GFP_KERNEL, &rx_urb->transfer_dma); 134 if (rx_buf == NULL) 135 goto free_tx_buf; 136 137 138 iphone->tx_urb = tx_urb; 139 iphone->rx_urb = rx_urb; 140 iphone->tx_buf = tx_buf; 141 iphone->rx_buf = rx_buf; 142 return 0; 143 144 free_tx_buf: 145 usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, tx_buf, 146 tx_urb->transfer_dma); 147 free_rx_urb: 148 usb_free_urb(rx_urb); 149 free_tx_urb: 150 usb_free_urb(tx_urb); 151 error_nomem: 152 return -ENOMEM; 153 } 154 155 static void ipheth_free_urbs(struct ipheth_device *iphone) 156 { 157 usb_free_coherent(iphone->udev, iphone->rx_buf_len, iphone->rx_buf, 158 iphone->rx_urb->transfer_dma); 159 usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, iphone->tx_buf, 160 iphone->tx_urb->transfer_dma); 161 usb_free_urb(iphone->rx_urb); 162 usb_free_urb(iphone->tx_urb); 163 } 164 165 static void ipheth_kill_urbs(struct ipheth_device *dev) 166 { 167 usb_kill_urb(dev->tx_urb); 168 usb_kill_urb(dev->rx_urb); 169 } 170 171 static int ipheth_consume_skb(char *buf, int len, struct ipheth_device *dev) 172 { 173 struct sk_buff *skb; 174 175 skb = dev_alloc_skb(len); 176 if (!skb) { 177 dev->net->stats.rx_dropped++; 178 return -ENOMEM; 179 } 180 181 skb_put_data(skb, buf, len); 182 skb->dev = dev->net; 183 skb->protocol = eth_type_trans(skb, dev->net); 184 185 dev->net->stats.rx_packets++; 186 dev->net->stats.rx_bytes += len; 187 netif_rx(skb); 188 189 return 0; 190 } 191 192 static int ipheth_rcvbulk_callback_legacy(struct urb *urb) 193 { 194 struct ipheth_device *dev; 195 char *buf; 196 int len; 197 198 dev = urb->context; 199 200 if (urb->actual_length <= IPHETH_IP_ALIGN) { 201 dev->net->stats.rx_length_errors++; 202 return -EINVAL; 203 } 204 len = urb->actual_length - IPHETH_IP_ALIGN; 205 buf = urb->transfer_buffer + IPHETH_IP_ALIGN; 206 207 return ipheth_consume_skb(buf, len, dev); 208 } 209 210 static int ipheth_rcvbulk_callback_ncm(struct urb *urb) 211 { 212 struct usb_cdc_ncm_nth16 *ncmh; 213 struct usb_cdc_ncm_ndp16 *ncm0; 214 struct usb_cdc_ncm_dpe16 *dpe; 215 struct ipheth_device *dev; 216 int retval = -EINVAL; 217 char *buf; 218 int len; 219 220 dev = urb->context; 221 222 if (urb->actual_length < IPHETH_NCM_HEADER_SIZE) { 223 dev->net->stats.rx_length_errors++; 224 return retval; 225 } 226 227 ncmh = urb->transfer_buffer; 228 if (ncmh->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN) || 229 le16_to_cpu(ncmh->wNdpIndex) >= urb->actual_length) { 230 dev->net->stats.rx_errors++; 231 return retval; 232 } 233 234 ncm0 = urb->transfer_buffer + le16_to_cpu(ncmh->wNdpIndex); 235 if (ncm0->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN) || 236 le16_to_cpu(ncmh->wHeaderLength) + le16_to_cpu(ncm0->wLength) >= 237 urb->actual_length) { 238 dev->net->stats.rx_errors++; 239 return retval; 240 } 241 242 dpe = ncm0->dpe16; 243 while (le16_to_cpu(dpe->wDatagramIndex) != 0 && 244 le16_to_cpu(dpe->wDatagramLength) != 0) { 245 if (le16_to_cpu(dpe->wDatagramIndex) >= urb->actual_length || 246 le16_to_cpu(dpe->wDatagramIndex) + 247 le16_to_cpu(dpe->wDatagramLength) > urb->actual_length) { 248 dev->net->stats.rx_length_errors++; 249 return retval; 250 } 251 252 buf = urb->transfer_buffer + le16_to_cpu(dpe->wDatagramIndex); 253 len = le16_to_cpu(dpe->wDatagramLength); 254 255 retval = ipheth_consume_skb(buf, len, dev); 256 if (retval != 0) 257 return retval; 258 259 dpe++; 260 } 261 262 return 0; 263 } 264 265 static void ipheth_rcvbulk_callback(struct urb *urb) 266 { 267 struct ipheth_device *dev; 268 int retval, status; 269 270 dev = urb->context; 271 if (dev == NULL) 272 return; 273 274 status = urb->status; 275 switch (status) { 276 case -ENOENT: 277 case -ECONNRESET: 278 case -ESHUTDOWN: 279 case -EPROTO: 280 return; 281 case 0: 282 break; 283 default: 284 dev_err(&dev->intf->dev, "%s: urb status: %d\n", 285 __func__, status); 286 return; 287 } 288 289 /* iPhone may periodically send URBs with no payload 290 * on the "bulk in" endpoint. It is safe to ignore them. 291 */ 292 if (urb->actual_length == 0) 293 goto rx_submit; 294 295 /* RX URBs starting with 0x00 0x01 do not encapsulate Ethernet frames, 296 * but rather are control frames. Their purpose is not documented, and 297 * they don't affect driver functionality, okay to drop them. 298 * There is usually just one 4-byte control frame as the very first 299 * URB received from the bulk IN endpoint. 300 */ 301 if (unlikely 302 (urb->actual_length == 4 && 303 ((char *)urb->transfer_buffer)[0] == 0 && 304 ((char *)urb->transfer_buffer)[1] == 1)) 305 goto rx_submit; 306 307 retval = dev->rcvbulk_callback(urb); 308 if (retval != 0) { 309 dev_err(&dev->intf->dev, "%s: callback retval: %d\n", 310 __func__, retval); 311 } 312 313 rx_submit: 314 dev->confirmed_pairing = true; 315 ipheth_rx_submit(dev, GFP_ATOMIC); 316 } 317 318 static void ipheth_sndbulk_callback(struct urb *urb) 319 { 320 struct ipheth_device *dev; 321 int status = urb->status; 322 323 dev = urb->context; 324 if (dev == NULL) 325 return; 326 327 if (status != 0 && 328 status != -ENOENT && 329 status != -ECONNRESET && 330 status != -ESHUTDOWN) 331 dev_err(&dev->intf->dev, "%s: urb status: %d\n", 332 __func__, status); 333 334 if (status == 0) 335 netif_wake_queue(dev->net); 336 else 337 // on URB error, trigger immediate poll 338 schedule_delayed_work(&dev->carrier_work, 0); 339 } 340 341 static int ipheth_carrier_set(struct ipheth_device *dev) 342 { 343 struct usb_device *udev; 344 int retval; 345 346 if (!dev->confirmed_pairing) 347 return 0; 348 349 udev = dev->udev; 350 retval = usb_control_msg(udev, 351 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP), 352 IPHETH_CMD_CARRIER_CHECK, /* request */ 353 0xc0, /* request type */ 354 0x00, /* value */ 355 0x02, /* index */ 356 dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE, 357 IPHETH_CTRL_TIMEOUT); 358 if (retval <= 0) { 359 dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n", 360 __func__, retval); 361 return retval; 362 } 363 364 if ((retval == 1 && dev->ctrl_buf[0] == IPHETH_CARRIER_ON) || 365 (retval >= 2 && dev->ctrl_buf[1] == IPHETH_CARRIER_ON)) { 366 netif_carrier_on(dev->net); 367 if (dev->tx_urb->status != -EINPROGRESS) 368 netif_wake_queue(dev->net); 369 } else { 370 netif_carrier_off(dev->net); 371 netif_stop_queue(dev->net); 372 } 373 return 0; 374 } 375 376 static void ipheth_carrier_check_work(struct work_struct *work) 377 { 378 struct ipheth_device *dev = container_of(work, struct ipheth_device, 379 carrier_work.work); 380 381 ipheth_carrier_set(dev); 382 schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT); 383 } 384 385 static int ipheth_get_macaddr(struct ipheth_device *dev) 386 { 387 struct usb_device *udev = dev->udev; 388 struct net_device *net = dev->net; 389 int retval; 390 391 retval = usb_control_msg(udev, 392 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP), 393 IPHETH_CMD_GET_MACADDR, /* request */ 394 0xc0, /* request type */ 395 0x00, /* value */ 396 0x02, /* index */ 397 dev->ctrl_buf, 398 IPHETH_CTRL_BUF_SIZE, 399 IPHETH_CTRL_TIMEOUT); 400 if (retval < 0) { 401 dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n", 402 __func__, retval); 403 } else if (retval < ETH_ALEN) { 404 dev_err(&dev->intf->dev, 405 "%s: usb_control_msg: short packet: %d bytes\n", 406 __func__, retval); 407 retval = -EINVAL; 408 } else { 409 eth_hw_addr_set(net, dev->ctrl_buf); 410 retval = 0; 411 } 412 413 return retval; 414 } 415 416 static int ipheth_enable_ncm(struct ipheth_device *dev) 417 { 418 struct usb_device *udev = dev->udev; 419 int retval; 420 421 retval = usb_control_msg(udev, 422 usb_sndctrlpipe(udev, IPHETH_CTRL_ENDP), 423 IPHETH_CMD_ENABLE_NCM, /* request */ 424 0x41, /* request type */ 425 0x00, /* value */ 426 0x02, /* index */ 427 NULL, 428 0, 429 IPHETH_CTRL_TIMEOUT); 430 431 dev_info(&dev->intf->dev, "%s: usb_control_msg: %d\n", 432 __func__, retval); 433 434 return retval; 435 } 436 437 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags) 438 { 439 struct usb_device *udev = dev->udev; 440 int retval; 441 442 usb_fill_bulk_urb(dev->rx_urb, udev, 443 usb_rcvbulkpipe(udev, dev->bulk_in), 444 dev->rx_buf, dev->rx_buf_len, 445 ipheth_rcvbulk_callback, 446 dev); 447 dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 448 449 retval = usb_submit_urb(dev->rx_urb, mem_flags); 450 if (retval) 451 dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n", 452 __func__, retval); 453 return retval; 454 } 455 456 static int ipheth_open(struct net_device *net) 457 { 458 struct ipheth_device *dev = netdev_priv(net); 459 struct usb_device *udev = dev->udev; 460 int retval = 0; 461 462 usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM); 463 464 retval = ipheth_carrier_set(dev); 465 if (retval) 466 return retval; 467 468 retval = ipheth_rx_submit(dev, GFP_KERNEL); 469 if (retval) 470 return retval; 471 472 schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT); 473 return retval; 474 } 475 476 static int ipheth_close(struct net_device *net) 477 { 478 struct ipheth_device *dev = netdev_priv(net); 479 480 netif_stop_queue(net); 481 cancel_delayed_work_sync(&dev->carrier_work); 482 return 0; 483 } 484 485 static netdev_tx_t ipheth_tx(struct sk_buff *skb, struct net_device *net) 486 { 487 struct ipheth_device *dev = netdev_priv(net); 488 struct usb_device *udev = dev->udev; 489 int retval; 490 491 /* Paranoid */ 492 if (skb->len > IPHETH_TX_BUF_SIZE) { 493 WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len); 494 dev->net->stats.tx_dropped++; 495 dev_kfree_skb_any(skb); 496 return NETDEV_TX_OK; 497 } 498 499 memcpy(dev->tx_buf, skb->data, skb->len); 500 501 usb_fill_bulk_urb(dev->tx_urb, udev, 502 usb_sndbulkpipe(udev, dev->bulk_out), 503 dev->tx_buf, skb->len, 504 ipheth_sndbulk_callback, 505 dev); 506 dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 507 508 netif_stop_queue(net); 509 retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC); 510 if (retval) { 511 dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n", 512 __func__, retval); 513 dev->net->stats.tx_errors++; 514 dev_kfree_skb_any(skb); 515 netif_wake_queue(net); 516 } else { 517 dev->net->stats.tx_packets++; 518 dev->net->stats.tx_bytes += skb->len; 519 dev_consume_skb_any(skb); 520 } 521 522 return NETDEV_TX_OK; 523 } 524 525 static void ipheth_tx_timeout(struct net_device *net, unsigned int txqueue) 526 { 527 struct ipheth_device *dev = netdev_priv(net); 528 529 dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__); 530 dev->net->stats.tx_errors++; 531 usb_unlink_urb(dev->tx_urb); 532 } 533 534 static u32 ipheth_ethtool_op_get_link(struct net_device *net) 535 { 536 struct ipheth_device *dev = netdev_priv(net); 537 return netif_carrier_ok(dev->net); 538 } 539 540 static const struct ethtool_ops ops = { 541 .get_link = ipheth_ethtool_op_get_link 542 }; 543 544 static const struct net_device_ops ipheth_netdev_ops = { 545 .ndo_open = ipheth_open, 546 .ndo_stop = ipheth_close, 547 .ndo_start_xmit = ipheth_tx, 548 .ndo_tx_timeout = ipheth_tx_timeout, 549 }; 550 551 static int ipheth_probe(struct usb_interface *intf, 552 const struct usb_device_id *id) 553 { 554 struct usb_device *udev = interface_to_usbdev(intf); 555 struct usb_host_interface *hintf; 556 struct usb_endpoint_descriptor *endp; 557 struct ipheth_device *dev; 558 struct net_device *netdev; 559 int i; 560 int retval; 561 562 netdev = alloc_etherdev(sizeof(struct ipheth_device)); 563 if (!netdev) 564 return -ENOMEM; 565 566 netdev->netdev_ops = &ipheth_netdev_ops; 567 netdev->watchdog_timeo = IPHETH_TX_TIMEOUT; 568 strscpy(netdev->name, "eth%d", sizeof(netdev->name)); 569 570 dev = netdev_priv(netdev); 571 dev->udev = udev; 572 dev->net = netdev; 573 dev->intf = intf; 574 dev->confirmed_pairing = false; 575 dev->rx_buf_len = IPHETH_RX_BUF_SIZE_LEGACY; 576 dev->rcvbulk_callback = ipheth_rcvbulk_callback_legacy; 577 /* Set up endpoints */ 578 hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM); 579 if (hintf == NULL) { 580 retval = -ENODEV; 581 dev_err(&intf->dev, "Unable to find alternate settings interface\n"); 582 goto err_endpoints; 583 } 584 585 for (i = 0; i < hintf->desc.bNumEndpoints; i++) { 586 endp = &hintf->endpoint[i].desc; 587 if (usb_endpoint_is_bulk_in(endp)) 588 dev->bulk_in = endp->bEndpointAddress; 589 else if (usb_endpoint_is_bulk_out(endp)) 590 dev->bulk_out = endp->bEndpointAddress; 591 } 592 if (!(dev->bulk_in && dev->bulk_out)) { 593 retval = -ENODEV; 594 dev_err(&intf->dev, "Unable to find endpoints\n"); 595 goto err_endpoints; 596 } 597 598 dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL); 599 if (dev->ctrl_buf == NULL) { 600 retval = -ENOMEM; 601 goto err_alloc_ctrl_buf; 602 } 603 604 retval = ipheth_get_macaddr(dev); 605 if (retval) 606 goto err_get_macaddr; 607 608 retval = ipheth_enable_ncm(dev); 609 if (!retval) { 610 dev->rx_buf_len = IPHETH_RX_BUF_SIZE_NCM; 611 dev->rcvbulk_callback = ipheth_rcvbulk_callback_ncm; 612 } 613 614 INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work); 615 616 retval = ipheth_alloc_urbs(dev); 617 if (retval) { 618 dev_err(&intf->dev, "error allocating urbs: %d\n", retval); 619 goto err_alloc_urbs; 620 } 621 622 usb_set_intfdata(intf, dev); 623 624 SET_NETDEV_DEV(netdev, &intf->dev); 625 netdev->ethtool_ops = &ops; 626 627 retval = register_netdev(netdev); 628 if (retval) { 629 dev_err(&intf->dev, "error registering netdev: %d\n", retval); 630 retval = -EIO; 631 goto err_register_netdev; 632 } 633 // carrier down and transmit queues stopped until packet from device 634 netif_carrier_off(netdev); 635 netif_tx_stop_all_queues(netdev); 636 dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n"); 637 return 0; 638 639 err_register_netdev: 640 ipheth_free_urbs(dev); 641 err_alloc_urbs: 642 err_get_macaddr: 643 kfree(dev->ctrl_buf); 644 err_alloc_ctrl_buf: 645 err_endpoints: 646 free_netdev(netdev); 647 return retval; 648 } 649 650 static void ipheth_disconnect(struct usb_interface *intf) 651 { 652 struct ipheth_device *dev; 653 654 dev = usb_get_intfdata(intf); 655 if (dev != NULL) { 656 unregister_netdev(dev->net); 657 ipheth_kill_urbs(dev); 658 ipheth_free_urbs(dev); 659 kfree(dev->ctrl_buf); 660 free_netdev(dev->net); 661 } 662 usb_set_intfdata(intf, NULL); 663 dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n"); 664 } 665 666 static struct usb_driver ipheth_driver = { 667 .name = "ipheth", 668 .probe = ipheth_probe, 669 .disconnect = ipheth_disconnect, 670 .id_table = ipheth_table, 671 .disable_hub_initiated_lpm = 1, 672 }; 673 674 module_usb_driver(ipheth_driver); 675 676 MODULE_AUTHOR("Diego Giagio <diego@giagio.com>"); 677 MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver"); 678 MODULE_LICENSE("Dual BSD/GPL"); 679