projects/linux·blob master · refs

704 lines · 18.7 KiB

1/*
2 * ipheth.c - Apple iPhone USB Ethernet driver
3 *
4 * Copyright (c) 2009 Diego Giagio <[email protected]>
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/* On iOS devices, NCM headers in RX have a fixed size regardless of DPE count:
65 * - NTH16 (NCMH): 12 bytes, as per CDC NCM 1.0 spec
66 * - NDP16 (NCM0): 96 bytes, of which
67 * - NDP16 fixed header: 8 bytes
68 * - maximum of 22 DPEs (21 datagrams + trailer), 4 bytes each
69 */
70#define IPHETH_NDP16_MAX_DPE 22
71#define IPHETH_NDP16_HEADER_SIZE (sizeof(struct usb_cdc_ncm_ndp16) + \
72 IPHETH_NDP16_MAX_DPE * \
73 sizeof(struct usb_cdc_ncm_dpe16))
74#define IPHETH_NCM_HEADER_SIZE (sizeof(struct usb_cdc_ncm_nth16) + \
75 IPHETH_NDP16_HEADER_SIZE)
76#define IPHETH_TX_BUF_SIZE ETH_FRAME_LEN
77#define IPHETH_RX_BUF_SIZE_LEGACY (IPHETH_IP_ALIGN + ETH_FRAME_LEN)
78#define IPHETH_RX_BUF_SIZE_NCM 65536
79
80#define IPHETH_TX_TIMEOUT (5 * HZ)
81
82#define IPHETH_INTFNUM 2
83#define IPHETH_ALT_INTFNUM 1
84
85#define IPHETH_CTRL_ENDP 0x00
86#define IPHETH_CTRL_BUF_SIZE 0x40
87#define IPHETH_CTRL_TIMEOUT (5 * HZ)
88
89#define IPHETH_CMD_GET_MACADDR 0x00
90#define IPHETH_CMD_ENABLE_NCM 0x04
91#define IPHETH_CMD_CARRIER_CHECK 0x45
92
93#define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
94#define IPHETH_CARRIER_ON 0x04
95
96static const struct usb_device_id ipheth_table[] = {
97 { USB_VENDOR_AND_INTERFACE_INFO(USB_VENDOR_APPLE, IPHETH_USBINTF_CLASS,
98 IPHETH_USBINTF_SUBCLASS,
99 IPHETH_USBINTF_PROTO) },
100 { }
101};
102MODULE_DEVICE_TABLE(usb, ipheth_table);
103
104struct ipheth_device {
105 struct usb_device *udev;
106 struct usb_interface *intf;
107 struct net_device *net;
108 struct urb *tx_urb;
109 struct urb *rx_urb;
110 unsigned char *tx_buf;
111 unsigned char *rx_buf;
112 unsigned char *ctrl_buf;
113 u8 bulk_in;
114 u8 bulk_out;
115 struct delayed_work carrier_work;
116 bool confirmed_pairing;
117 int (*rcvbulk_callback)(struct urb *urb);
118 size_t rx_buf_len;
119};
120
121static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);
122
123static int ipheth_alloc_urbs(struct ipheth_device *iphone)
124{
125 struct urb *tx_urb = NULL;
126 struct urb *rx_urb = NULL;
127 u8 *tx_buf = NULL;
128 u8 *rx_buf = NULL;
129
130 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
131 if (tx_urb == NULL)
132 goto error_nomem;
133
134 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
135 if (rx_urb == NULL)
136 goto free_tx_urb;
137
138 tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_TX_BUF_SIZE,
139 GFP_KERNEL, &tx_urb->transfer_dma);
140 if (tx_buf == NULL)
141 goto free_rx_urb;
142
143 rx_buf = usb_alloc_coherent(iphone->udev, iphone->rx_buf_len,
144 GFP_KERNEL, &rx_urb->transfer_dma);
145 if (rx_buf == NULL)
146 goto free_tx_buf;
147
148
149 iphone->tx_urb = tx_urb;
150 iphone->rx_urb = rx_urb;
151 iphone->tx_buf = tx_buf;
152 iphone->rx_buf = rx_buf;
153 return 0;
154
155free_tx_buf:
156 usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, tx_buf,
157 tx_urb->transfer_dma);
158free_rx_urb:
159 usb_free_urb(rx_urb);
160free_tx_urb:
161 usb_free_urb(tx_urb);
162error_nomem:
163 return -ENOMEM;
164}
165
166static void ipheth_free_urbs(struct ipheth_device *iphone)
167{
168 usb_free_coherent(iphone->udev, iphone->rx_buf_len, iphone->rx_buf,
169 iphone->rx_urb->transfer_dma);
170 usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, iphone->tx_buf,
171 iphone->tx_urb->transfer_dma);
172 usb_free_urb(iphone->rx_urb);
173 usb_free_urb(iphone->tx_urb);
174}
175
176static void ipheth_kill_urbs(struct ipheth_device *dev)
177{
178 usb_kill_urb(dev->tx_urb);
179 usb_kill_urb(dev->rx_urb);
180}
181
182static int ipheth_consume_skb(char *buf, int len, struct ipheth_device *dev)
183{
184 struct sk_buff *skb;
185
186 skb = dev_alloc_skb(len);
187 if (!skb) {
188 dev->net->stats.rx_dropped++;
189 return -ENOMEM;
190 }
191
192 skb_put_data(skb, buf, len);
193 skb->dev = dev->net;
194 skb->protocol = eth_type_trans(skb, dev->net);
195
196 dev->net->stats.rx_packets++;
197 dev->net->stats.rx_bytes += len;
198 netif_rx(skb);
199
200 return 0;
201}
202
203static int ipheth_rcvbulk_callback_legacy(struct urb *urb)
204{
205 struct ipheth_device *dev;
206 char *buf;
207 int len;
208
209 dev = urb->context;
210
211 if (urb->actual_length <= IPHETH_IP_ALIGN) {
212 dev->net->stats.rx_length_errors++;
213 return -EINVAL;
214 }
215 len = urb->actual_length - IPHETH_IP_ALIGN;
216 buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
217
218 return ipheth_consume_skb(buf, len, dev);
219}
220
221/* In "NCM mode", the iOS device encapsulates RX (phone->computer) traffic
222 * in NCM Transfer Blocks (similarly to CDC NCM). However, unlike reverse
223 * tethering (handled by the `cdc_ncm` driver), regular tethering is not
224 * compliant with the CDC NCM spec, as the device is missing the necessary
225 * descriptors, and TX (computer->phone) traffic is not encapsulated
226 * at all. Thus `ipheth` implements a very limited subset of the spec with
227 * the sole purpose of parsing RX URBs.
228 */
229static int ipheth_rcvbulk_callback_ncm(struct urb *urb)
230{
231 struct usb_cdc_ncm_nth16 *ncmh;
232 struct usb_cdc_ncm_ndp16 *ncm0;
233 struct usb_cdc_ncm_dpe16 *dpe;
234 struct ipheth_device *dev;
235 u16 dg_idx, dg_len;
236 int retval = -EINVAL;
237 char *buf;
238
239 dev = urb->context;
240
241 if (urb->actual_length < IPHETH_NCM_HEADER_SIZE) {
242 dev->net->stats.rx_length_errors++;
243 return retval;
244 }
245
246 ncmh = urb->transfer_buffer;
247 if (ncmh->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN) ||
248 /* On iOS, NDP16 directly follows NTH16 */
249 ncmh->wNdpIndex != cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)))
250 goto rx_error;
251
252 ncm0 = urb->transfer_buffer + sizeof(struct usb_cdc_ncm_nth16);
253 if (ncm0->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN))
254 goto rx_error;
255
256 dpe = ncm0->dpe16;
257 for (int dpe_i = 0; dpe_i < IPHETH_NDP16_MAX_DPE; ++dpe_i, ++dpe) {
258 dg_idx = le16_to_cpu(dpe->wDatagramIndex);
259 dg_len = le16_to_cpu(dpe->wDatagramLength);
260
261 /* Null DPE must be present after last datagram pointer entry
262 * (3.3.1 USB CDC NCM spec v1.0)
263 */
264 if (dg_idx == 0 && dg_len == 0)
265 return 0;
266
267 if (dg_idx < IPHETH_NCM_HEADER_SIZE ||
268 dg_idx >= urb->actual_length ||
269 dg_len > urb->actual_length - dg_idx) {
270 dev->net->stats.rx_length_errors++;
271 return retval;
272 }
273
274 buf = urb->transfer_buffer + dg_idx;
275
276 retval = ipheth_consume_skb(buf, dg_len, dev);
277 if (retval != 0)
278 return retval;
279 }
280
281rx_error:
282 dev->net->stats.rx_errors++;
283 return retval;
284}
285
286static void ipheth_rcvbulk_callback(struct urb *urb)
287{
288 struct ipheth_device *dev;
289 int retval, status;
290
291 dev = urb->context;
292 if (dev == NULL)
293 return;
294
295 status = urb->status;
296 switch (status) {
297 case -ENOENT:
298 case -ECONNRESET:
299 case -ESHUTDOWN:
300 case -EPROTO:
301 return;
302 case 0:
303 break;
304 default:
305 dev_err(&dev->intf->dev, "%s: urb status: %d\n",
306 __func__, status);
307 return;
308 }
309
310 /* iPhone may periodically send URBs with no payload
311 * on the "bulk in" endpoint. It is safe to ignore them.
312 */
313 if (urb->actual_length == 0)
314 goto rx_submit;
315
316 /* RX URBs starting with 0x00 0x01 do not encapsulate Ethernet frames,
317 * but rather are control frames. Their purpose is not documented, and
318 * they don't affect driver functionality, okay to drop them.
319 * There is usually just one 4-byte control frame as the very first
320 * URB received from the bulk IN endpoint.
321 */
322 if (unlikely
323 (urb->actual_length == 4 &&
324 ((char *)urb->transfer_buffer)[0] == 0 &&
325 ((char *)urb->transfer_buffer)[1] == 1))
326 goto rx_submit;
327
328 retval = dev->rcvbulk_callback(urb);
329 if (retval != 0) {
330 dev_err(&dev->intf->dev, "%s: callback retval: %d\n",
331 __func__, retval);
332 }
333
334rx_submit:
335 dev->confirmed_pairing = true;
336 ipheth_rx_submit(dev, GFP_ATOMIC);
337}
338
339static void ipheth_sndbulk_callback(struct urb *urb)
340{
341 struct ipheth_device *dev;
342 int status = urb->status;
343
344 dev = urb->context;
345 if (dev == NULL)
346 return;
347
348 if (status != 0 &&
349 status != -ENOENT &&
350 status != -ECONNRESET &&
351 status != -ESHUTDOWN)
352 dev_err(&dev->intf->dev, "%s: urb status: %d\n",
353 __func__, status);
354
355 if (status == 0)
356 netif_wake_queue(dev->net);
357 else
358 // on URB error, trigger immediate poll
359 schedule_delayed_work(&dev->carrier_work, 0);
360}
361
362static int ipheth_carrier_set(struct ipheth_device *dev)
363{
364 struct usb_device *udev;
365 int retval;
366
367 if (!dev->confirmed_pairing)
368 return 0;
369
370 udev = dev->udev;
371 retval = usb_control_msg(udev,
372 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
373 IPHETH_CMD_CARRIER_CHECK, /* request */
374 0xc0, /* request type */
375 0x00, /* value */
376 0x02, /* index */
377 dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
378 IPHETH_CTRL_TIMEOUT);
379 if (retval <= 0) {
380 dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
381 __func__, retval);
382 return retval;
383 }
384
385 if ((retval == 1 && dev->ctrl_buf[0] == IPHETH_CARRIER_ON) ||
386 (retval >= 2 && dev->ctrl_buf[1] == IPHETH_CARRIER_ON)) {
387 netif_carrier_on(dev->net);
388 if (dev->tx_urb->status != -EINPROGRESS)
389 netif_wake_queue(dev->net);
390 } else {
391 netif_carrier_off(dev->net);
392 netif_stop_queue(dev->net);
393 }
394 return 0;
395}
396
397static void ipheth_carrier_check_work(struct work_struct *work)
398{
399 struct ipheth_device *dev = container_of(work, struct ipheth_device,
400 carrier_work.work);
401
402 ipheth_carrier_set(dev);
403 schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
404}
405
406static int ipheth_get_macaddr(struct ipheth_device *dev)
407{
408 struct usb_device *udev = dev->udev;
409 struct net_device *net = dev->net;
410 int retval;
411
412 retval = usb_control_msg(udev,
413 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
414 IPHETH_CMD_GET_MACADDR, /* request */
415 0xc0, /* request type */
416 0x00, /* value */
417 0x02, /* index */
418 dev->ctrl_buf,
419 IPHETH_CTRL_BUF_SIZE,
420 IPHETH_CTRL_TIMEOUT);
421 if (retval < 0) {
422 dev_err(&dev->intf->dev, "%s: usb_control_msg: %d\n",
423 __func__, retval);
424 } else if (retval < ETH_ALEN) {
425 dev_err(&dev->intf->dev,
426 "%s: usb_control_msg: short packet: %d bytes\n",
427 __func__, retval);
428 retval = -EINVAL;
429 } else {
430 eth_hw_addr_set(net, dev->ctrl_buf);
431 retval = 0;
432 }
433
434 return retval;
435}
436
437static int ipheth_enable_ncm(struct ipheth_device *dev)
438{
439 struct usb_device *udev = dev->udev;
440 int retval;
441
442 retval = usb_control_msg(udev,
443 usb_sndctrlpipe(udev, IPHETH_CTRL_ENDP),
444 IPHETH_CMD_ENABLE_NCM, /* request */
445 0x41, /* request type */
446 0x00, /* value */
447 0x02, /* index */
448 NULL,
449 0,
450 IPHETH_CTRL_TIMEOUT);
451
452 dev_info(&dev->intf->dev, "%s: usb_control_msg: %d\n",
453 __func__, retval);
454
455 return retval;
456}
457
458static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
459{
460 struct usb_device *udev = dev->udev;
461 int retval;
462
463 usb_fill_bulk_urb(dev->rx_urb, udev,
464 usb_rcvbulkpipe(udev, dev->bulk_in),
465 dev->rx_buf, dev->rx_buf_len,
466 ipheth_rcvbulk_callback,
467 dev);
468 dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
469
470 retval = usb_submit_urb(dev->rx_urb, mem_flags);
471 if (retval)
472 dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
473 __func__, retval);
474 return retval;
475}
476
477static int ipheth_open(struct net_device *net)
478{
479 struct ipheth_device *dev = netdev_priv(net);
480 struct usb_device *udev = dev->udev;
481 int retval = 0;
482
483 usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
484
485 retval = ipheth_carrier_set(dev);
486 if (retval)
487 return retval;
488
489 retval = ipheth_rx_submit(dev, GFP_KERNEL);
490 if (retval)
491 return retval;
492
493 enable_delayed_work(&dev->carrier_work);
494 schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
495 return retval;
496}
497
498static int ipheth_close(struct net_device *net)
499{
500 struct ipheth_device *dev = netdev_priv(net);
501
502 netif_stop_queue(net);
503 /* A TX URB can still complete with an error after this point and
504 * try to re-arm the carrier work. Disable it instead of cancelling
505 * it, so that such a schedule_delayed_work() is a no-op.
506 */
507 disable_delayed_work_sync(&dev->carrier_work);
508 return 0;
509}
510
511static netdev_tx_t ipheth_tx(struct sk_buff *skb, struct net_device *net)
512{
513 struct ipheth_device *dev = netdev_priv(net);
514 struct usb_device *udev = dev->udev;
515 int retval;
516
517 /* Paranoid */
518 if (skb->len > IPHETH_TX_BUF_SIZE) {
519 WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
520 dev->net->stats.tx_dropped++;
521 dev_kfree_skb_any(skb);
522 return NETDEV_TX_OK;
523 }
524
525 memcpy(dev->tx_buf, skb->data, skb->len);
526
527 usb_fill_bulk_urb(dev->tx_urb, udev,
528 usb_sndbulkpipe(udev, dev->bulk_out),
529 dev->tx_buf, skb->len,
530 ipheth_sndbulk_callback,
531 dev);
532 dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
533
534 netif_stop_queue(net);
535 retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
536 if (retval) {
537 dev_err(&dev->intf->dev, "%s: usb_submit_urb: %d\n",
538 __func__, retval);
539 dev->net->stats.tx_errors++;
540 dev_kfree_skb_any(skb);
541 netif_wake_queue(net);
542 } else {
543 dev->net->stats.tx_packets++;
544 dev->net->stats.tx_bytes += skb->len;
545 dev_consume_skb_any(skb);
546 }
547
548 return NETDEV_TX_OK;
549}
550
551static void ipheth_tx_timeout(struct net_device *net, unsigned int txqueue)
552{
553 struct ipheth_device *dev = netdev_priv(net);
554
555 dev_err(&dev->intf->dev, "%s: TX timeout\n", __func__);
556 dev->net->stats.tx_errors++;
557 usb_unlink_urb(dev->tx_urb);
558}
559
560static u32 ipheth_ethtool_op_get_link(struct net_device *net)
561{
562 struct ipheth_device *dev = netdev_priv(net);
563 return netif_carrier_ok(dev->net);
564}
565
566static const struct ethtool_ops ops = {
567 .get_link = ipheth_ethtool_op_get_link
568};
569
570static const struct net_device_ops ipheth_netdev_ops = {
571 .ndo_open = ipheth_open,
572 .ndo_stop = ipheth_close,
573 .ndo_start_xmit = ipheth_tx,
574 .ndo_tx_timeout = ipheth_tx_timeout,
575};
576
577static int ipheth_probe(struct usb_interface *intf,
578 const struct usb_device_id *id)
579{
580 struct usb_device *udev = interface_to_usbdev(intf);
581 struct usb_endpoint_descriptor *ep_in, *ep_out;
582 struct usb_host_interface *hintf;
583 struct ipheth_device *dev;
584 struct net_device *netdev;
585 int retval;
586
587 netdev = alloc_etherdev(sizeof(struct ipheth_device));
588 if (!netdev)
589 return -ENOMEM;
590
591 netdev->netdev_ops = &ipheth_netdev_ops;
592 netdev->watchdog_timeo = IPHETH_TX_TIMEOUT;
593 strscpy(netdev->name, "eth%d", sizeof(netdev->name));
594
595 dev = netdev_priv(netdev);
596 dev->udev = udev;
597 dev->net = netdev;
598 dev->intf = intf;
599 dev->confirmed_pairing = false;
600 dev->rx_buf_len = IPHETH_RX_BUF_SIZE_LEGACY;
601 dev->rcvbulk_callback = ipheth_rcvbulk_callback_legacy;
602 /* Set up endpoints */
603 hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
604 if (hintf == NULL) {
605 retval = -ENODEV;
606 dev_err(&intf->dev, "Unable to find alternate settings interface\n");
607 goto err_endpoints;
608 }
609
610 retval = usb_find_common_endpoints_reverse(hintf, &ep_in, &ep_out,
611 NULL, NULL);
612 if (retval) {
613 dev_err(&intf->dev, "Unable to find endpoints\n");
614 goto err_endpoints;
615 }
616
617 dev->bulk_in = ep_in->bEndpointAddress;
618 dev->bulk_out = ep_out->bEndpointAddress;
619
620 dev->ctrl_buf = kmalloc(IPHETH_CTRL_BUF_SIZE, GFP_KERNEL);
621 if (dev->ctrl_buf == NULL) {
622 retval = -ENOMEM;
623 goto err_alloc_ctrl_buf;
624 }
625
626 retval = ipheth_get_macaddr(dev);
627 if (retval)
628 goto err_get_macaddr;
629
630 retval = ipheth_enable_ncm(dev);
631 if (!retval) {
632 dev->rx_buf_len = IPHETH_RX_BUF_SIZE_NCM;
633 dev->rcvbulk_callback = ipheth_rcvbulk_callback_ncm;
634 }
635
636 INIT_DELAYED_WORK(&dev->carrier_work, ipheth_carrier_check_work);
637 /* Armed only between ipheth_open() and ipheth_close(). Start out
638 * disabled so the enable/disable counts balance from the first open.
639 */
640 disable_delayed_work(&dev->carrier_work);
641
642 retval = ipheth_alloc_urbs(dev);
643 if (retval) {
644 dev_err(&intf->dev, "error allocating urbs: %d\n", retval);
645 goto err_alloc_urbs;
646 }
647
648 usb_set_intfdata(intf, dev);
649
650 SET_NETDEV_DEV(netdev, &intf->dev);
651 netdev->ethtool_ops = &ops;
652
653 retval = register_netdev(netdev);
654 if (retval) {
655 dev_err(&intf->dev, "error registering netdev: %d\n", retval);
656 retval = -EIO;
657 goto err_register_netdev;
658 }
659 // carrier down and transmit queues stopped until packet from device
660 netif_carrier_off(netdev);
661 netif_tx_stop_all_queues(netdev);
662 dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
663 return 0;
664
665err_register_netdev:
666 ipheth_free_urbs(dev);
667err_alloc_urbs:
668err_get_macaddr:
669 kfree(dev->ctrl_buf);
670err_alloc_ctrl_buf:
671err_endpoints:
672 free_netdev(netdev);
673 return retval;
674}
675
676static void ipheth_disconnect(struct usb_interface *intf)
677{
678 struct ipheth_device *dev;
679
680 dev = usb_get_intfdata(intf);
681 if (dev != NULL) {
682 unregister_netdev(dev->net);
683 ipheth_kill_urbs(dev);
684 ipheth_free_urbs(dev);
685 kfree(dev->ctrl_buf);
686 free_netdev(dev->net);
687 }
688 usb_set_intfdata(intf, NULL);
689 dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
690}
691
692static struct usb_driver ipheth_driver = {
693 .name = "ipheth",
694 .probe = ipheth_probe,
695 .disconnect = ipheth_disconnect,
696 .id_table = ipheth_table,
697 .disable_hub_initiated_lpm = 1,
698};
699
700module_usb_driver(ipheth_driver);
701
702MODULE_AUTHOR("Diego Giagio <[email protected]>");
703MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
704MODULE_LICENSE("Dual BSD/GPL");