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ipheth.c (16295B)


      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 
     56 #define USB_VENDOR_APPLE        0x05ac
     57 #define USB_PRODUCT_IPHONE      0x1290
     58 #define USB_PRODUCT_IPHONE_3G   0x1292
     59 #define USB_PRODUCT_IPHONE_3GS  0x1294
     60 #define USB_PRODUCT_IPHONE_4	0x1297
     61 #define USB_PRODUCT_IPAD 0x129a
     62 #define USB_PRODUCT_IPAD_2	0x12a2
     63 #define USB_PRODUCT_IPAD_3	0x12a6
     64 #define USB_PRODUCT_IPAD_MINI    0x12ab
     65 #define USB_PRODUCT_IPHONE_4_VZW 0x129c
     66 #define USB_PRODUCT_IPHONE_4S	0x12a0
     67 #define USB_PRODUCT_IPHONE_5	0x12a8
     68 
     69 #define IPHETH_USBINTF_CLASS    255
     70 #define IPHETH_USBINTF_SUBCLASS 253
     71 #define IPHETH_USBINTF_PROTO    1
     72 
     73 #define IPHETH_BUF_SIZE         1516
     74 #define IPHETH_IP_ALIGN		2	/* padding at front of URB */
     75 #define IPHETH_TX_TIMEOUT       (5 * HZ)
     76 
     77 #define IPHETH_INTFNUM          2
     78 #define IPHETH_ALT_INTFNUM      1
     79 
     80 #define IPHETH_CTRL_ENDP        0x00
     81 #define IPHETH_CTRL_BUF_SIZE    0x40
     82 #define IPHETH_CTRL_TIMEOUT     (5 * HZ)
     83 
     84 #define IPHETH_CMD_GET_MACADDR   0x00
     85 #define IPHETH_CMD_CARRIER_CHECK 0x45
     86 
     87 #define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
     88 #define IPHETH_CARRIER_ON       0x04
     89 
     90 static const struct usb_device_id ipheth_table[] = {
     91 	{ USB_DEVICE_AND_INTERFACE_INFO(
     92 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
     93 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
     94 		IPHETH_USBINTF_PROTO) },
     95 	{ USB_DEVICE_AND_INTERFACE_INFO(
     96 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3G,
     97 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
     98 		IPHETH_USBINTF_PROTO) },
     99 	{ USB_DEVICE_AND_INTERFACE_INFO(
    100 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3GS,
    101 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    102 		IPHETH_USBINTF_PROTO) },
    103 	{ USB_DEVICE_AND_INTERFACE_INFO(
    104 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4,
    105 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    106 		IPHETH_USBINTF_PROTO) },
    107 	{ USB_DEVICE_AND_INTERFACE_INFO(
    108 		USB_VENDOR_APPLE, USB_PRODUCT_IPAD,
    109 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    110 		IPHETH_USBINTF_PROTO) },
    111 	{ USB_DEVICE_AND_INTERFACE_INFO(
    112 		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_2,
    113 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    114 		IPHETH_USBINTF_PROTO) },
    115 	{ USB_DEVICE_AND_INTERFACE_INFO(
    116 		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_3,
    117 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    118 		IPHETH_USBINTF_PROTO) },
    119 	{ USB_DEVICE_AND_INTERFACE_INFO(
    120 		USB_VENDOR_APPLE, USB_PRODUCT_IPAD_MINI,
    121 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    122 		IPHETH_USBINTF_PROTO) },
    123 	{ USB_DEVICE_AND_INTERFACE_INFO(
    124 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4_VZW,
    125 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    126 		IPHETH_USBINTF_PROTO) },
    127 	{ USB_DEVICE_AND_INTERFACE_INFO(
    128 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4S,
    129 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    130 		IPHETH_USBINTF_PROTO) },
    131 	{ USB_DEVICE_AND_INTERFACE_INFO(
    132 		USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_5,
    133 		IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
    134 		IPHETH_USBINTF_PROTO) },
    135 	{ }
    136 };
    137 MODULE_DEVICE_TABLE(usb, ipheth_table);
    138 
    139 struct ipheth_device {
    140 	struct usb_device *udev;
    141 	struct usb_interface *intf;
    142 	struct net_device *net;
    143 	struct urb *tx_urb;
    144 	struct urb *rx_urb;
    145 	unsigned char *tx_buf;
    146 	unsigned char *rx_buf;
    147 	unsigned char *ctrl_buf;
    148 	u8 bulk_in;
    149 	u8 bulk_out;
    150 	struct delayed_work carrier_work;
    151 	bool confirmed_pairing;
    152 };
    153 
    154 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);
    155 
    156 static int ipheth_alloc_urbs(struct ipheth_device *iphone)
    157 {
    158 	struct urb *tx_urb = NULL;
    159 	struct urb *rx_urb = NULL;
    160 	u8 *tx_buf = NULL;
    161 	u8 *rx_buf = NULL;
    162 
    163 	tx_urb = usb_alloc_urb(0, GFP_KERNEL);
    164 	if (tx_urb == NULL)
    165 		goto error_nomem;
    166 
    167 	rx_urb = usb_alloc_urb(0, GFP_KERNEL);
    168 	if (rx_urb == NULL)
    169 		goto free_tx_urb;
    170 
    171 	tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
    172 				    GFP_KERNEL, &tx_urb->transfer_dma);
    173 	if (tx_buf == NULL)
    174 		goto free_rx_urb;
    175 
    176 	rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
    177 				    GFP_KERNEL, &rx_urb->transfer_dma);
    178 	if (rx_buf == NULL)
    179 		goto free_tx_buf;
    180 
    181 
    182 	iphone->tx_urb = tx_urb;
    183 	iphone->rx_urb = rx_urb;
    184 	iphone->tx_buf = tx_buf;
    185 	iphone->rx_buf = rx_buf;
    186 	return 0;
    187 
    188 free_tx_buf:
    189 	usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
    190 			  tx_urb->transfer_dma);
    191 free_rx_urb:
    192 	usb_free_urb(rx_urb);
    193 free_tx_urb:
    194 	usb_free_urb(tx_urb);
    195 error_nomem:
    196 	return -ENOMEM;
    197 }
    198 
    199 static void ipheth_free_urbs(struct ipheth_device *iphone)
    200 {
    201 	usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
    202 			  iphone->rx_urb->transfer_dma);
    203 	usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->tx_buf,
    204 			  iphone->tx_urb->transfer_dma);
    205 	usb_free_urb(iphone->rx_urb);
    206 	usb_free_urb(iphone->tx_urb);
    207 }
    208 
    209 static void ipheth_kill_urbs(struct ipheth_device *dev)
    210 {
    211 	usb_kill_urb(dev->tx_urb);
    212 	usb_kill_urb(dev->rx_urb);
    213 }
    214 
    215 static void ipheth_rcvbulk_callback(struct urb *urb)
    216 {
    217 	struct ipheth_device *dev;
    218 	struct sk_buff *skb;
    219 	int status;
    220 	char *buf;
    221 	int len;
    222 
    223 	dev = urb->context;
    224 	if (dev == NULL)
    225 		return;
    226 
    227 	status = urb->status;
    228 	switch (status) {
    229 	case -ENOENT:
    230 	case -ECONNRESET:
    231 	case -ESHUTDOWN:
    232 	case -EPROTO:
    233 		return;
    234 	case 0:
    235 		break;
    236 	default:
    237 		dev_err(&dev->intf->dev, "%s: urb status: %d\n",
    238 			__func__, status);
    239 		return;
    240 	}
    241 
    242 	if (urb->actual_length <= IPHETH_IP_ALIGN) {
    243 		dev->net->stats.rx_length_errors++;
    244 		return;
    245 	}
    246 	len = urb->actual_length - IPHETH_IP_ALIGN;
    247 	buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
    248 
    249 	skb = dev_alloc_skb(len);
    250 	if (!skb) {
    251 		dev_err(&dev->intf->dev, "%s: dev_alloc_skb: -ENOMEM\n",
    252 			__func__);
    253 		dev->net->stats.rx_dropped++;
    254 		return;
    255 	}
    256 
    257 	skb_put_data(skb, buf, len);
    258 	skb->dev = dev->net;
    259 	skb->protocol = eth_type_trans(skb, dev->net);
    260 
    261 	dev->net->stats.rx_packets++;
    262 	dev->net->stats.rx_bytes += len;
    263 	dev->confirmed_pairing = true;
    264 	netif_rx(skb);
    265 	ipheth_rx_submit(dev, GFP_ATOMIC);
    266 }
    267 
    268 static void ipheth_sndbulk_callback(struct urb *urb)
    269 {
    270 	struct ipheth_device *dev;
    271 	int status = urb->status;
    272 
    273 	dev = urb->context;
    274 	if (dev == NULL)
    275 		return;
    276 
    277 	if (status != 0 &&
    278 	    status != -ENOENT &&
    279 	    status != -ECONNRESET &&
    280 	    status != -ESHUTDOWN)
    281 		dev_err(&dev->intf->dev, "%s: urb status: %d\n",
    282 		__func__, status);
    283 
    284 	if (status == 0)
    285 		netif_wake_queue(dev->net);
    286 	else
    287 		// on URB error, trigger immediate poll
    288 		schedule_delayed_work(&dev->carrier_work, 0);
    289 }
    290 
    291 static int ipheth_carrier_set(struct ipheth_device *dev)
    292 {
    293 	struct usb_device *udev;
    294 	int retval;
    295 
    296 	if (!dev)
    297 		return 0;
    298 	if (!dev->confirmed_pairing)
    299 		return 0;
    300 
    301 	udev = dev->udev;
    302 	retval = usb_control_msg(udev,
    303 			usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
    304 			IPHETH_CMD_CARRIER_CHECK, /* request */
    305 			0xc0, /* request type */
    306 			0x00, /* value */
    307 			0x02, /* index */
    308 			dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
    309 			IPHETH_CTRL_TIMEOUT);
    310 	if (retval < 0) {
    311 		dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
    312 			__func__, retval);
    313 		return retval;
    314 	}
    315 
    316 	if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON) {
    317 		netif_carrier_on(dev->net);
    318 		if (dev->tx_urb->status != -EINPROGRESS)
    319 			netif_wake_queue(dev->net);
    320 	} else {
    321 		netif_carrier_off(dev->net);
    322 		netif_stop_queue(dev->net);
    323 	}
    324 	return 0;
    325 }
    326 
    327 static void ipheth_carrier_check_work(struct work_struct *work)
    328 {
    329 	struct ipheth_device *dev = container_of(work, struct ipheth_device,
    330 						 carrier_work.work);
    331 
    332 	ipheth_carrier_set(dev);
    333 	schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
    334 }
    335 
    336 static int ipheth_get_macaddr(struct ipheth_device *dev)
    337 {
    338 	struct usb_device *udev = dev->udev;
    339 	struct net_device *net = dev->net;
    340 	int retval;
    341 
    342 	retval = usb_control_msg(udev,
    343 				 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
    344 				 IPHETH_CMD_GET_MACADDR, /* request */
    345 				 0xc0, /* request type */
    346 				 0x00, /* value */
    347 				 0x02, /* index */
    348 				 dev->ctrl_buf,
    349 				 IPHETH_CTRL_BUF_SIZE,
    350 				 IPHETH_CTRL_TIMEOUT);
    351 	if (retval < 0) {
    352 		dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
    353 			__func__, retval);
    354 	} else if (retval < ETH_ALEN) {
    355 		dev_err(&dev->intf->dev,
    356 			"%s: usb_control_msg: short packet: %d bytes\n",
    357 			__func__, retval);
    358 		retval = -EINVAL;
    359 	} else {
    360 		memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
    361 		retval = 0;
    362 	}
    363 
    364 	return retval;
    365 }
    366 
    367 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
    368 {
    369 	struct usb_device *udev = dev->udev;
    370 	int retval;
    371 
    372 	usb_fill_bulk_urb(dev->rx_urb, udev,
    373 			  usb_rcvbulkpipe(udev, dev->bulk_in),
    374 			  dev->rx_buf, IPHETH_BUF_SIZE,
    375 			  ipheth_rcvbulk_callback,
    376 			  dev);
    377 	dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
    378 
    379 	retval = usb_submit_urb(dev->rx_urb, mem_flags);
    380 	if (retval)
    381 		dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
    382 			__func__, retval);
    383 	return retval;
    384 }
    385 
    386 static int ipheth_open(struct net_device *net)
    387 {
    388 	struct ipheth_device *dev = netdev_priv(net);
    389 	struct usb_device *udev = dev->udev;
    390 	int retval = 0;
    391 
    392 	usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
    393 
    394 	retval = ipheth_carrier_set(dev);
    395 	if (retval)
    396 		return retval;
    397 
    398 	retval = ipheth_rx_submit(dev, GFP_KERNEL);
    399 	if (retval)
    400 		return retval;
    401 
    402 	schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
    403 	return retval;
    404 }
    405 
    406 static int ipheth_close(struct net_device *net)
    407 {
    408 	struct ipheth_device *dev = netdev_priv(net);
    409 
    410 	cancel_delayed_work_sync(&dev->carrier_work);
    411 	netif_stop_queue(net);
    412 	return 0;
    413 }
    414 
    415 static int ipheth_tx(struct sk_buff *skb, struct net_device *net)
    416 {
    417 	struct ipheth_device *dev = netdev_priv(net);
    418 	struct usb_device *udev = dev->udev;
    419 	int retval;
    420 
    421 	/* Paranoid */
    422 	if (skb->len > IPHETH_BUF_SIZE) {
    423 		WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
    424 		dev->net->stats.tx_dropped++;
    425 		dev_kfree_skb_any(skb);
    426 		return NETDEV_TX_OK;
    427 	}
    428 
    429 	memcpy(dev->tx_buf, skb->data, skb->len);
    430 	if (skb->len < IPHETH_BUF_SIZE)
    431 		memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);
    432 
    433 	usb_fill_bulk_urb(dev->tx_urb, udev,
    434 			  usb_sndbulkpipe(udev, dev->bulk_out),
    435 			  dev->tx_buf, IPHETH_BUF_SIZE,
    436 			  ipheth_sndbulk_callback,
    437 			  dev);
    438 	dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
    439 
    440 	retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
    441 	if (retval) {
    442 		dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
    443 			__func__, retval);
    444 		dev->net->stats.tx_errors++;
    445 		dev_kfree_skb_any(skb);
    446 	} else {
    447 		dev->net->stats.tx_packets++;
    448 		dev->net->stats.tx_bytes += skb->len;
    449 		dev_consume_skb_any(skb);
    450 		netif_stop_queue(net);
    451 	}
    452 
    453 	return NETDEV_TX_OK;
    454 }
    455 
    456 static void ipheth_tx_timeout(struct net_device *net)
    457 {
    458 	struct ipheth_device *dev = netdev_priv(net);
    459 
    460 	dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__);
    461 	dev->net->stats.tx_errors++;
    462 	usb_unlink_urb(dev->tx_urb);
    463 }
    464 
    465 static u32 ipheth_ethtool_op_get_link(struct net_device *net)
    466 {
    467 	struct ipheth_device *dev = netdev_priv(net);
    468 	return netif_carrier_ok(dev->net);
    469 }
    470 
    471 static const struct ethtool_ops ops = {
    472 	.get_link = ipheth_ethtool_op_get_link
    473 };
    474 
    475 static const struct net_device_ops ipheth_netdev_ops = {
    476 	.ndo_open = ipheth_open,
    477 	.ndo_stop = ipheth_close,
    478 	.ndo_start_xmit = ipheth_tx,
    479 	.ndo_tx_timeout = ipheth_tx_timeout,
    480 };
    481 
    482 static int ipheth_probe(struct usb_interface *intf,
    483 			const struct usb_device_id *id)
    484 {
    485 	struct usb_device *udev = interface_to_usbdev(intf);
    486 	struct usb_host_interface *hintf;
    487 	struct usb_endpoint_descriptor *endp;
    488 	struct ipheth_device *dev;
    489 	struct net_device *netdev;
    490 	int i;
    491 	int retval;
    492 
    493 	netdev = alloc_etherdev(sizeof(struct ipheth_device));
    494 	if (!netdev)
    495 		return -ENOMEM;
    496 
    497 	netdev->netdev_ops = &ipheth_netdev_ops;
    498 	netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
    499 	strcpy(netdev->name, "eth%d");
    500 
    501 	dev = netdev_priv(netdev);
    502 	dev->udev = udev;
    503 	dev->net = netdev;
    504 	dev->intf = intf;
    505 	dev->confirmed_pairing = false;
    506 	/* Set up endpoints */
    507 	hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
    508 	if (hintf == NULL) {
    509 		retval = -ENODEV;
    510 		dev_err(&intf->dev, "Unable to find alternate settings interface\n");
    511 		goto err_endpoints;
    512 	}
    513 
    514 	for (i = 0; i < hintf->desc.bNumEndpoints; i++) {
    515 		endp = &hintf->endpoint[i].desc;
    516 		if (usb_endpoint_is_bulk_in(endp))
    517 			dev->bulk_in = endp->bEndpointAddress;
    518 		else if (usb_endpoint_is_bulk_out(endp))
    519 			dev->bulk_out = endp->bEndpointAddress;
    520 	}
    521 	if (!(dev->bulk_in && dev->bulk_out)) {
    522 		retval = -ENODEV;
    523 		dev_err(&intf->dev, "Unable to find endpoints\n");
    524 		goto err_endpoints;
    525 	}
    526 
    527 	dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
    528 	if (dev->ctrl_buf == NULL) {
    529 		retval = -ENOMEM;
    530 		goto err_alloc_ctrl_buf;
    531 	}
    532 
    533 	retval = ipheth_get_macaddr(dev);
    534 	if (retval)
    535 		goto err_get_macaddr;
    536 
    537 	INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
    538 
    539 	retval = ipheth_alloc_urbs(dev);
    540 	if (retval) {
    541 		dev_err(&intf->dev, "error allocating urbs: %d\n", retval);
    542 		goto err_alloc_urbs;
    543 	}
    544 
    545 	usb_set_intfdata(intf, dev);
    546 
    547 	SET_NETDEV_DEV(netdev, &intf->dev);
    548 	netdev->ethtool_ops = &ops;
    549 
    550 	retval = register_netdev(netdev);
    551 	if (retval) {
    552 		dev_err(&intf->dev, "error registering netdev: %d\n", retval);
    553 		retval = -EIO;
    554 		goto err_register_netdev;
    555 	}
    556 	// carrier down and transmit queues stopped until packet from device
    557 	netif_carrier_off(netdev);
    558 	netif_tx_stop_all_queues(netdev);
    559 	dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
    560 	return 0;
    561 
    562 err_register_netdev:
    563 	ipheth_free_urbs(dev);
    564 err_alloc_urbs:
    565 err_get_macaddr:
    566 err_alloc_ctrl_buf:
    567 	kfree(dev->ctrl_buf);
    568 err_endpoints:
    569 	free_netdev(netdev);
    570 	return retval;
    571 }
    572 
    573 static void ipheth_disconnect(struct usb_interface *intf)
    574 {
    575 	struct ipheth_device *dev;
    576 
    577 	dev = usb_get_intfdata(intf);
    578 	if (dev != NULL) {
    579 		unregister_netdev(dev->net);
    580 		ipheth_kill_urbs(dev);
    581 		ipheth_free_urbs(dev);
    582 		kfree(dev->ctrl_buf);
    583 		free_netdev(dev->net);
    584 	}
    585 	usb_set_intfdata(intf, NULL);
    586 	dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
    587 }
    588 
    589 static struct usb_driver ipheth_driver = {
    590 	.name =		"ipheth",
    591 	.probe =	ipheth_probe,
    592 	.disconnect =	ipheth_disconnect,
    593 	.id_table =	ipheth_table,
    594 	.disable_hub_initiated_lpm = 1,
    595 };
    596 
    597 module_usb_driver(ipheth_driver);
    598 
    599 MODULE_AUTHOR("Diego Giagio <diego@giagio.com>");
    600 MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
    601 MODULE_LICENSE("Dual BSD/GPL");