?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Blackfin: sanitize manual control of IPEND[4]
[linux-2.6/linux-2.6-openrd.git] / drivers / net / usb / cdc-phonet.c
blob97e54d9d03ce760bea2b7178b646c82a41d87c5c
1 /*
2 * phonet.c -- USB CDC Phonet host driver
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
5 *
6 * Author: Rémi Denis-Courmont
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/usb.h>
26 #include <linux/usb/cdc.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_phonet.h>
30 #include <linux/phonet.h>
31
32 #define PN_MEDIA_USB 0x1B
33
34 static const unsigned rxq_size = 17;
35
36 struct usbpn_dev {
37 struct net_device *dev;
38
39 struct usb_interface *intf, *data_intf;
40 struct usb_device *usb;
41 unsigned int tx_pipe, rx_pipe;
42 u8 active_setting;
43 u8 disconnected;
44
45 unsigned tx_queue;
46 spinlock_t tx_lock;
47
48 spinlock_t rx_lock;
49 struct sk_buff *rx_skb;
50 struct urb *urbs[0];
51 };
52
53 static void tx_complete(struct urb *req);
54 static void rx_complete(struct urb *req);
55
56 /*
57 * Network device callbacks
58 */
59 static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev)
60 {
61 struct usbpn_dev *pnd = netdev_priv(dev);
62 struct urb *req = NULL;
63 unsigned long flags;
64 int err;
65
66 if (skb->protocol != htons(ETH_P_PHONET))
67 goto drop;
68
69 req = usb_alloc_urb(0, GFP_ATOMIC);
70 if (!req)
71 goto drop;
72 usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
73 tx_complete, skb);
74 req->transfer_flags = URB_ZERO_PACKET;
75 err = usb_submit_urb(req, GFP_ATOMIC);
76 if (err) {
77 usb_free_urb(req);
78 goto drop;
79 }
80
81 spin_lock_irqsave(&pnd->tx_lock, flags);
82 pnd->tx_queue++;
83 if (pnd->tx_queue >= dev->tx_queue_len)
84 netif_stop_queue(dev);
85 spin_unlock_irqrestore(&pnd->tx_lock, flags);
86 return NETDEV_TX_OK;
87
88 drop:
89 dev_kfree_skb(skb);
90 dev->stats.tx_dropped++;
91 return NETDEV_TX_OK;
92 }
93
94 static void tx_complete(struct urb *req)
95 {
96 struct sk_buff *skb = req->context;
97 struct net_device *dev = skb->dev;
98 struct usbpn_dev *pnd = netdev_priv(dev);
99
100 switch (req->status) {
101 case 0:
102 dev->stats.tx_bytes += skb->len;
103 break;
104
105 case -ENOENT:
106 case -ECONNRESET:
107 case -ESHUTDOWN:
108 dev->stats.tx_aborted_errors++;
109 default:
110 dev->stats.tx_errors++;
111 dev_dbg(&dev->dev, "TX error (%d)\n", req->status);
112 }
113 dev->stats.tx_packets++;
114
115 spin_lock(&pnd->tx_lock);
116 pnd->tx_queue--;
117 netif_wake_queue(dev);
118 spin_unlock(&pnd->tx_lock);
119
120 dev_kfree_skb_any(skb);
121 usb_free_urb(req);
122 }
123
124 static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
125 {
126 struct net_device *dev = pnd->dev;
127 struct page *page;
128 int err;
129
130 page = __netdev_alloc_page(dev, gfp_flags);
131 if (!page)
132 return -ENOMEM;
133
134 usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
135 PAGE_SIZE, rx_complete, dev);
136 req->transfer_flags = 0;
137 err = usb_submit_urb(req, gfp_flags);
138 if (unlikely(err)) {
139 dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
140 netdev_free_page(dev, page);
141 }
142 return err;
143 }
144
145 static void rx_complete(struct urb *req)
146 {
147 struct net_device *dev = req->context;
148 struct usbpn_dev *pnd = netdev_priv(dev);
149 struct page *page = virt_to_page(req->transfer_buffer);
150 struct sk_buff *skb;
151 unsigned long flags;
152
153 switch (req->status) {
154 case 0:
155 spin_lock_irqsave(&pnd->rx_lock, flags);
156 skb = pnd->rx_skb;
157 if (!skb) {
158 skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
159 if (likely(skb)) {
160 /* Can't use pskb_pull() on page in IRQ */
161 memcpy(skb_put(skb, 1), page_address(page), 1);
162 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
163 page, 1, req->actual_length);
164 page = NULL;
165 }
166 } else {
167 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
168 page, 0, req->actual_length);
169 page = NULL;
170 }
171 if (req->actual_length < PAGE_SIZE)
172 pnd->rx_skb = NULL; /* Last fragment */
173 else
174 skb = NULL;
175 spin_unlock_irqrestore(&pnd->rx_lock, flags);
176 if (skb) {
177 skb->protocol = htons(ETH_P_PHONET);
178 skb_reset_mac_header(skb);
179 __skb_pull(skb, 1);
180 skb->dev = dev;
181 dev->stats.rx_packets++;
182 dev->stats.rx_bytes += skb->len;
183
184 netif_rx(skb);
185 }
186 goto resubmit;
187
188 case -ENOENT:
189 case -ECONNRESET:
190 case -ESHUTDOWN:
191 req = NULL;
192 break;
193
194 case -EOVERFLOW:
195 dev->stats.rx_over_errors++;
196 dev_dbg(&dev->dev, "RX overflow\n");
197 break;
198
199 case -EILSEQ:
200 dev->stats.rx_crc_errors++;
201 break;
202 }
203
204 dev->stats.rx_errors++;
205 resubmit:
206 if (page)
207 netdev_free_page(dev, page);
208 if (req)
209 rx_submit(pnd, req, GFP_ATOMIC);
210 }
211
212 static int usbpn_close(struct net_device *dev);
213
214 static int usbpn_open(struct net_device *dev)
215 {
216 struct usbpn_dev *pnd = netdev_priv(dev);
217 int err;
218 unsigned i;
219 unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
220
221 err = usb_set_interface(pnd->usb, num, pnd->active_setting);
222 if (err)
223 return err;
224
225 for (i = 0; i < rxq_size; i++) {
226 struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
227
228 if (!req || rx_submit(pnd, req, GFP_KERNEL)) {
229 usbpn_close(dev);
230 return -ENOMEM;
231 }
232 pnd->urbs[i] = req;
233 }
234
235 netif_wake_queue(dev);
236 return 0;
237 }
238
239 static int usbpn_close(struct net_device *dev)
240 {
241 struct usbpn_dev *pnd = netdev_priv(dev);
242 unsigned i;
243 unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
244
245 netif_stop_queue(dev);
246
247 for (i = 0; i < rxq_size; i++) {
248 struct urb *req = pnd->urbs[i];
249
250 if (!req)
251 continue;
252 usb_kill_urb(req);
253 usb_free_urb(req);
254 pnd->urbs[i] = NULL;
255 }
256
257 return usb_set_interface(pnd->usb, num, !pnd->active_setting);
258 }
259
260 static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
261 {
262 struct if_phonet_req *req = (struct if_phonet_req *)ifr;
263
264 switch (cmd) {
265 case SIOCPNGAUTOCONF:
266 req->ifr_phonet_autoconf.device = PN_DEV_PC;
267 printk(KERN_CRIT"device is PN_DEV_PC\n");
268 return 0;
269 }
270 return -ENOIOCTLCMD;
271 }
272
273 static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
274 {
275 if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
276 return -EINVAL;
277
278 dev->mtu = new_mtu;
279 return 0;
280 }
281
282 static const struct net_device_ops usbpn_ops = {
283 .ndo_open = usbpn_open,
284 .ndo_stop = usbpn_close,
285 .ndo_start_xmit = usbpn_xmit,
286 .ndo_do_ioctl = usbpn_ioctl,
287 .ndo_change_mtu = usbpn_set_mtu,
288 };
289
290 static void usbpn_setup(struct net_device *dev)
291 {
292 dev->features = 0;
293 dev->netdev_ops = &usbpn_ops,
294 dev->header_ops = &phonet_header_ops;
295 dev->type = ARPHRD_PHONET;
296 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
297 dev->mtu = PHONET_MAX_MTU;
298 dev->hard_header_len = 1;
299 dev->dev_addr[0] = PN_MEDIA_USB;
300 dev->addr_len = 1;
301 dev->tx_queue_len = 3;
302
303 dev->destructor = free_netdev;
304 }
305
306 /*
307 * USB driver callbacks
308 */
309 static struct usb_device_id usbpn_ids[] = {
310 {
311 .match_flags = USB_DEVICE_ID_MATCH_VENDOR
312 | USB_DEVICE_ID_MATCH_INT_CLASS
313 | USB_DEVICE_ID_MATCH_INT_SUBCLASS,
314 .idVendor = 0x0421, /* Nokia */
315 .bInterfaceClass = USB_CLASS_COMM,
316 .bInterfaceSubClass = 0xFE,
317 },
318 { },
319 };
320
321 MODULE_DEVICE_TABLE(usb, usbpn_ids);
322
323 static struct usb_driver usbpn_driver;
324
325 int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
326 {
327 static const char ifname[] = "usbpn%d";
328 const struct usb_cdc_union_desc *union_header = NULL;
329 const struct usb_cdc_header_desc *phonet_header = NULL;
330 const struct usb_host_interface *data_desc;
331 struct usb_interface *data_intf;
332 struct usb_device *usbdev = interface_to_usbdev(intf);
333 struct net_device *dev;
334 struct usbpn_dev *pnd;
335 u8 *data;
336 int len, err;
337
338 data = intf->altsetting->extra;
339 len = intf->altsetting->extralen;
340 while (len >= 3) {
341 u8 dlen = data[0];
342 if (dlen < 3)
343 return -EINVAL;
344
345 /* bDescriptorType */
346 if (data[1] == USB_DT_CS_INTERFACE) {
347 /* bDescriptorSubType */
348 switch (data[2]) {
349 case USB_CDC_UNION_TYPE:
350 if (union_header || dlen < 5)
351 break;
352 union_header =
353 (struct usb_cdc_union_desc *)data;
354 break;
355 case 0xAB:
356 if (phonet_header || dlen < 5)
357 break;
358 phonet_header =
359 (struct usb_cdc_header_desc *)data;
360 break;
361 }
362 }
363 data += dlen;
364 len -= dlen;
365 }
366
367 if (!union_header || !phonet_header)
368 return -EINVAL;
369
370 data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
371 if (data_intf == NULL)
372 return -ENODEV;
373 /* Data interface has one inactive and one active setting */
374 if (data_intf->num_altsetting != 2)
375 return -EINVAL;
376 if (data_intf->altsetting[0].desc.bNumEndpoints == 0
377 && data_intf->altsetting[1].desc.bNumEndpoints == 2)
378 data_desc = data_intf->altsetting + 1;
379 else
380 if (data_intf->altsetting[0].desc.bNumEndpoints == 2
381 && data_intf->altsetting[1].desc.bNumEndpoints == 0)
382 data_desc = data_intf->altsetting;
383 else
384 return -EINVAL;
385
386 dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size,
387 ifname, usbpn_setup);
388 if (!dev)
389 return -ENOMEM;
390
391 pnd = netdev_priv(dev);
392 SET_NETDEV_DEV(dev, &intf->dev);
393 netif_stop_queue(dev);
394
395 pnd->dev = dev;
396 pnd->usb = usb_get_dev(usbdev);
397 pnd->intf = intf;
398 pnd->data_intf = data_intf;
399 spin_lock_init(&pnd->tx_lock);
400 spin_lock_init(&pnd->rx_lock);
401 /* Endpoints */
402 if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
403 pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
404 data_desc->endpoint[0].desc.bEndpointAddress);
405 pnd->tx_pipe = usb_sndbulkpipe(usbdev,
406 data_desc->endpoint[1].desc.bEndpointAddress);
407 } else {
408 pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
409 data_desc->endpoint[1].desc.bEndpointAddress);
410 pnd->tx_pipe = usb_sndbulkpipe(usbdev,
411 data_desc->endpoint[0].desc.bEndpointAddress);
412 }
413 pnd->active_setting = data_desc - data_intf->altsetting;
414
415 err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
416 if (err)
417 goto out;
418
419 /* Force inactive mode until the network device is brought UP */
420 usb_set_interface(usbdev, union_header->bSlaveInterface0,
421 !pnd->active_setting);
422 usb_set_intfdata(intf, pnd);
423
424 err = register_netdev(dev);
425 if (err) {
426 usb_driver_release_interface(&usbpn_driver, data_intf);
427 goto out;
428 }
429
430 dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
431 return 0;
432
433 out:
434 usb_set_intfdata(intf, NULL);
435 free_netdev(dev);
436 return err;
437 }
438
439 static void usbpn_disconnect(struct usb_interface *intf)
440 {
441 struct usbpn_dev *pnd = usb_get_intfdata(intf);
442 struct usb_device *usb = pnd->usb;
443
444 if (pnd->disconnected)
445 return;
446
447 pnd->disconnected = 1;
448 usb_driver_release_interface(&usbpn_driver,
449 (pnd->intf == intf) ? pnd->data_intf : pnd->intf);
450 unregister_netdev(pnd->dev);
451 usb_put_dev(usb);
452 }
453
454 static struct usb_driver usbpn_driver = {
455 .name = "cdc_phonet",
456 .probe = usbpn_probe,
457 .disconnect = usbpn_disconnect,
458 .id_table = usbpn_ids,
459 };
460
461 static int __init usbpn_init(void)
462 {
463 return usb_register(&usbpn_driver);
464 }
465
466 static void __exit usbpn_exit(void)
467 {
468 usb_deregister(&usbpn_driver);
469 }
470
471 module_init(usbpn_init);
472 module_exit(usbpn_exit);
473
474 MODULE_AUTHOR("Remi Denis-Courmont");
475 MODULE_DESCRIPTION("USB CDC Phonet host interface");
476 MODULE_LICENSE("GPL");
linux 2.6 git repository for openrd