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