?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / net / usb / ipheth.c
blob15772b1b6a91c71a847b45e9ecf8f854cba461dc
1 /*
2 * ipheth.c - Apple iPhone USB Ethernet driver
3 *
4 * Copyright (c) 2009 Diego Giagio <diego@giagio.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of GIAGIO.COM nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
23 *
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38 * DAMAGE.
39 *
40 *
41 * Attention: iPhone device must be paired, otherwise it won't respond to our
42 * driver. For more info: http://giagio.com/wiki/moin.cgi/iPhoneEthernetDriver
43 *
44 */
45
46 #include <linux/kernel.h>
47 #include <linux/errno.h>
48 #include <linux/init.h>
49 #include <linux/slab.h>
50 #include <linux/module.h>
51 #include <linux/netdevice.h>
52 #include <linux/etherdevice.h>
53 #include <linux/ethtool.h>
54 #include <linux/usb.h>
55 #include <linux/workqueue.h>
56
57 #define USB_VENDOR_APPLE 0x05ac
58 #define USB_PRODUCT_IPHONE 0x1290
59 #define USB_PRODUCT_IPHONE_3G 0x1292
60 #define USB_PRODUCT_IPHONE_3GS 0x1294
61 #define USB_PRODUCT_IPHONE_4 0x1297
62
63 #define IPHETH_USBINTF_CLASS 255
64 #define IPHETH_USBINTF_SUBCLASS 253
65 #define IPHETH_USBINTF_PROTO 1
66
67 #define IPHETH_BUF_SIZE 1516
68 #define IPHETH_IP_ALIGN 2 /* padding at front of URB */
69 #define IPHETH_TX_TIMEOUT (5 * HZ)
70
71 #define IPHETH_INTFNUM 2
72 #define IPHETH_ALT_INTFNUM 1
73
74 #define IPHETH_CTRL_ENDP 0x00
75 #define IPHETH_CTRL_BUF_SIZE 0x40
76 #define IPHETH_CTRL_TIMEOUT (5 * HZ)
77
78 #define IPHETH_CMD_GET_MACADDR 0x00
79 #define IPHETH_CMD_CARRIER_CHECK 0x45
80
81 #define IPHETH_CARRIER_CHECK_TIMEOUT round_jiffies_relative(1 * HZ)
82 #define IPHETH_CARRIER_ON 0x04
83
84 static struct usb_device_id ipheth_table[] = {
85 { USB_DEVICE_AND_INTERFACE_INFO(
86 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE,
87 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
88 IPHETH_USBINTF_PROTO) },
89 { USB_DEVICE_AND_INTERFACE_INFO(
90 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3G,
91 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
92 IPHETH_USBINTF_PROTO) },
93 { USB_DEVICE_AND_INTERFACE_INFO(
94 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_3GS,
95 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
96 IPHETH_USBINTF_PROTO) },
97 { USB_DEVICE_AND_INTERFACE_INFO(
98 USB_VENDOR_APPLE, USB_PRODUCT_IPHONE_4,
99 IPHETH_USBINTF_CLASS, IPHETH_USBINTF_SUBCLASS,
100 IPHETH_USBINTF_PROTO) },
101 { }
102 };
103 MODULE_DEVICE_TABLE(usb, ipheth_table);
104
105 struct ipheth_device {
106 struct usb_device *udev;
107 struct usb_interface *intf;
108 struct net_device *net;
109 struct sk_buff *tx_skb;
110 struct urb *tx_urb;
111 struct urb *rx_urb;
112 unsigned char *tx_buf;
113 unsigned char *rx_buf;
114 unsigned char *ctrl_buf;
115 u8 bulk_in;
116 u8 bulk_out;
117 struct delayed_work carrier_work;
118 };
119
120 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags);
121
122 static int ipheth_alloc_urbs(struct ipheth_device *iphone)
123 {
124 struct urb *tx_urb = NULL;
125 struct urb *rx_urb = NULL;
126 u8 *tx_buf = NULL;
127 u8 *rx_buf = NULL;
128
129 tx_urb = usb_alloc_urb(0, GFP_KERNEL);
130 if (tx_urb == NULL)
131 goto error_nomem;
132
133 rx_urb = usb_alloc_urb(0, GFP_KERNEL);
134 if (rx_urb == NULL)
135 goto free_tx_urb;
136
137 tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
138 GFP_KERNEL, &tx_urb->transfer_dma);
139 if (tx_buf == NULL)
140 goto free_rx_urb;
141
142 rx_buf = usb_alloc_coherent(iphone->udev, IPHETH_BUF_SIZE,
143 GFP_KERNEL, &rx_urb->transfer_dma);
144 if (rx_buf == NULL)
145 goto free_tx_buf;
146
147
148 iphone->tx_urb = tx_urb;
149 iphone->rx_urb = rx_urb;
150 iphone->tx_buf = tx_buf;
151 iphone->rx_buf = rx_buf;
152 return 0;
153
154 free_tx_buf:
155 usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, tx_buf,
156 tx_urb->transfer_dma);
157 free_rx_urb:
158 usb_free_urb(rx_urb);
159 free_tx_urb:
160 usb_free_urb(tx_urb);
161 error_nomem:
162 return -ENOMEM;
163 }
164
165 static void ipheth_free_urbs(struct ipheth_device *iphone)
166 {
167 usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->rx_buf,
168 iphone->rx_urb->transfer_dma);
169 usb_free_coherent(iphone->udev, IPHETH_BUF_SIZE, iphone->tx_buf,
170 iphone->tx_urb->transfer_dma);
171 usb_free_urb(iphone->rx_urb);
172 usb_free_urb(iphone->tx_urb);
173 }
174
175 static void ipheth_kill_urbs(struct ipheth_device *dev)
176 {
177 usb_kill_urb(dev->tx_urb);
178 usb_kill_urb(dev->rx_urb);
179 }
180
181 static void ipheth_rcvbulk_callback(struct urb *urb)
182 {
183 struct ipheth_device *dev;
184 struct sk_buff *skb;
185 int status;
186 char *buf;
187 int len;
188
189 dev = urb->context;
190 if (dev == NULL)
191 return;
192
193 status = urb->status;
194 switch (status) {
195 case -ENOENT:
196 case -ECONNRESET:
197 case -ESHUTDOWN:
198 return;
199 case 0:
200 break;
201 default:
202 err("%s: urb status: %d", __func__, status);
203 return;
204 }
205
206 if (urb->actual_length <= IPHETH_IP_ALIGN) {
207 dev->net->stats.rx_length_errors++;
208 return;
209 }
210 len = urb->actual_length - IPHETH_IP_ALIGN;
211 buf = urb->transfer_buffer + IPHETH_IP_ALIGN;
212
213 skb = dev_alloc_skb(len);
214 if (!skb) {
215 err("%s: dev_alloc_skb: -ENOMEM", __func__);
216 dev->net->stats.rx_dropped++;
217 return;
218 }
219
220 memcpy(skb_put(skb, len), buf, len);
221 skb->dev = dev->net;
222 skb->protocol = eth_type_trans(skb, dev->net);
223
224 dev->net->stats.rx_packets++;
225 dev->net->stats.rx_bytes += len;
226
227 netif_rx(skb);
228 ipheth_rx_submit(dev, GFP_ATOMIC);
229 }
230
231 static void ipheth_sndbulk_callback(struct urb *urb)
232 {
233 struct ipheth_device *dev;
234 int status = urb->status;
235
236 dev = urb->context;
237 if (dev == NULL)
238 return;
239
240 if (status != 0 &&
241 status != -ENOENT &&
242 status != -ECONNRESET &&
243 status != -ESHUTDOWN)
244 err("%s: urb status: %d", __func__, status);
245
246 dev_kfree_skb_irq(dev->tx_skb);
247 netif_wake_queue(dev->net);
248 }
249
250 static int ipheth_carrier_set(struct ipheth_device *dev)
251 {
252 struct usb_device *udev = dev->udev;
253 int retval;
254
255 retval = usb_control_msg(udev,
256 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
257 IPHETH_CMD_CARRIER_CHECK, /* request */
258 0xc0, /* request type */
259 0x00, /* value */
260 0x02, /* index */
261 dev->ctrl_buf, IPHETH_CTRL_BUF_SIZE,
262 IPHETH_CTRL_TIMEOUT);
263 if (retval < 0) {
264 err("%s: usb_control_msg: %d", __func__, retval);
265 return retval;
266 }
267
268 if (dev->ctrl_buf[0] == IPHETH_CARRIER_ON)
269 netif_carrier_on(dev->net);
270 else
271 netif_carrier_off(dev->net);
272
273 return 0;
274 }
275
276 static void ipheth_carrier_check_work(struct work_struct *work)
277 {
278 struct ipheth_device *dev = container_of(work, struct ipheth_device,
279 carrier_work.work);
280
281 ipheth_carrier_set(dev);
282 schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
283 }
284
285 static int ipheth_get_macaddr(struct ipheth_device *dev)
286 {
287 struct usb_device *udev = dev->udev;
288 struct net_device *net = dev->net;
289 int retval;
290
291 retval = usb_control_msg(udev,
292 usb_rcvctrlpipe(udev, IPHETH_CTRL_ENDP),
293 IPHETH_CMD_GET_MACADDR, /* request */
294 0xc0, /* request type */
295 0x00, /* value */
296 0x02, /* index */
297 dev->ctrl_buf,
298 IPHETH_CTRL_BUF_SIZE,
299 IPHETH_CTRL_TIMEOUT);
300 if (retval < 0) {
301 err("%s: usb_control_msg: %d", __func__, retval);
302 } else if (retval < ETH_ALEN) {
303 err("%s: usb_control_msg: short packet: %d bytes",
304 __func__, retval);
305 retval = -EINVAL;
306 } else {
307 memcpy(net->dev_addr, dev->ctrl_buf, ETH_ALEN);
308 retval = 0;
309 }
310
311 return retval;
312 }
313
314 static int ipheth_rx_submit(struct ipheth_device *dev, gfp_t mem_flags)
315 {
316 struct usb_device *udev = dev->udev;
317 int retval;
318
319 usb_fill_bulk_urb(dev->rx_urb, udev,
320 usb_rcvbulkpipe(udev, dev->bulk_in),
321 dev->rx_buf, IPHETH_BUF_SIZE,
322 ipheth_rcvbulk_callback,
323 dev);
324 dev->rx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
325
326 retval = usb_submit_urb(dev->rx_urb, mem_flags);
327 if (retval)
328 err("%s: usb_submit_urb: %d", __func__, retval);
329 return retval;
330 }
331
332 static int ipheth_open(struct net_device *net)
333 {
334 struct ipheth_device *dev = netdev_priv(net);
335 struct usb_device *udev = dev->udev;
336 int retval = 0;
337
338 usb_set_interface(udev, IPHETH_INTFNUM, IPHETH_ALT_INTFNUM);
339
340 retval = ipheth_carrier_set(dev);
341 if (retval)
342 return retval;
343
344 retval = ipheth_rx_submit(dev, GFP_KERNEL);
345 if (retval)
346 return retval;
347
348 schedule_delayed_work(&dev->carrier_work, IPHETH_CARRIER_CHECK_TIMEOUT);
349 netif_start_queue(net);
350 return retval;
351 }
352
353 static int ipheth_close(struct net_device *net)
354 {
355 struct ipheth_device *dev = netdev_priv(net);
356
357 cancel_delayed_work_sync(&dev->carrier_work);
358 netif_stop_queue(net);
359 return 0;
360 }
361
362 static int ipheth_tx(struct sk_buff *skb, struct net_device *net)
363 {
364 struct ipheth_device *dev = netdev_priv(net);
365 struct usb_device *udev = dev->udev;
366 int retval;
367
368 /* Paranoid */
369 if (skb->len > IPHETH_BUF_SIZE) {
370 WARN(1, "%s: skb too large: %d bytes\n", __func__, skb->len);
371 dev->net->stats.tx_dropped++;
372 dev_kfree_skb_irq(skb);
373 return NETDEV_TX_OK;
374 }
375
376 memcpy(dev->tx_buf, skb->data, skb->len);
377 if (skb->len < IPHETH_BUF_SIZE)
378 memset(dev->tx_buf + skb->len, 0, IPHETH_BUF_SIZE - skb->len);
379
380 usb_fill_bulk_urb(dev->tx_urb, udev,
381 usb_sndbulkpipe(udev, dev->bulk_out),
382 dev->tx_buf, IPHETH_BUF_SIZE,
383 ipheth_sndbulk_callback,
384 dev);
385 dev->tx_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
386
387 retval = usb_submit_urb(dev->tx_urb, GFP_ATOMIC);
388 if (retval) {
389 err("%s: usb_submit_urb: %d", __func__, retval);
390 dev->net->stats.tx_errors++;
391 dev_kfree_skb_irq(skb);
392 } else {
393 dev->tx_skb = skb;
394
395 dev->net->stats.tx_packets++;
396 dev->net->stats.tx_bytes += skb->len;
397 netif_stop_queue(net);
398 }
399
400 return NETDEV_TX_OK;
401 }
402
403 static void ipheth_tx_timeout(struct net_device *net)
404 {
405 struct ipheth_device *dev = netdev_priv(net);
406
407 err("%s: TX timeout", __func__);
408 dev->net->stats.tx_errors++;
409 usb_unlink_urb(dev->tx_urb);
410 }
411
412 static 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
418 static struct ethtool_ops ops = {
419 .get_link = ipheth_ethtool_op_get_link
420 };
421
422 static 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
429 static 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
453 /* Set up endpoints */
454 hintf = usb_altnum_to_altsetting(intf, IPHETH_ALT_INTFNUM);
455 if (hintf == NULL) {
456 retval = -ENODEV;
457 err("Unable to find alternate settings interface");
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 err("Unable to find endpoints");
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 err("error allocating urbs: %d", retval);
489 goto err_alloc_urbs;
490 }
491
492 usb_set_intfdata(intf, dev);
493
494 SET_NETDEV_DEV(netdev, &intf->dev);
495 SET_ETHTOOL_OPS(netdev, &ops);
496
497 retval = register_netdev(netdev);
498 if (retval) {
499 err("error registering netdev: %d", retval);
500 retval = -EIO;
501 goto err_register_netdev;
502 }
503
504 dev_info(&intf->dev, "Apple iPhone USB Ethernet device attached\n");
505 return 0;
506
507 err_register_netdev:
508 ipheth_free_urbs(dev);
509 err_alloc_urbs:
510 err_get_macaddr:
511 err_alloc_ctrl_buf:
512 kfree(dev->ctrl_buf);
513 err_endpoints:
514 free_netdev(netdev);
515 return retval;
516 }
517
518 static void ipheth_disconnect(struct usb_interface *intf)
519 {
520 struct ipheth_device *dev;
521
522 dev = usb_get_intfdata(intf);
523 if (dev != NULL) {
524 unregister_netdev(dev->net);
525 ipheth_kill_urbs(dev);
526 ipheth_free_urbs(dev);
527 kfree(dev->ctrl_buf);
528 free_netdev(dev->net);
529 }
530 usb_set_intfdata(intf, NULL);
531 dev_info(&intf->dev, "Apple iPhone USB Ethernet now disconnected\n");
532 }
533
534 static struct usb_driver ipheth_driver = {
535 .name = "ipheth",
536 .probe = ipheth_probe,
537 .disconnect = ipheth_disconnect,
538 .id_table = ipheth_table,
539 };
540
541 static int __init ipheth_init(void)
542 {
543 int retval;
544
545 retval = usb_register(&ipheth_driver);
546 if (retval) {
547 err("usb_register failed: %d", retval);
548 return retval;
549 }
550 return 0;
551 }
552
553 static void __exit ipheth_exit(void)
554 {
555 usb_deregister(&ipheth_driver);
556 }
557
558 module_init(ipheth_init);
559 module_exit(ipheth_exit);
560
561 MODULE_AUTHOR("Diego Giagio <diego@giagio.com>");
562 MODULE_DESCRIPTION("Apple iPhone USB Ethernet driver");
563 MODULE_LICENSE("Dual BSD/GPL");
linux-next