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23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/gfp.h>
26#include <linux/usb.h>
27#include <linux/usb/cdc.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/if_phonet.h>
31#include <linux/phonet.h>
32
33#define PN_MEDIA_USB 0x1B
34
35static const unsigned rxq_size = 17;
36
37struct usbpn_dev {
38 struct net_device *dev;
39
40 struct usb_interface *intf, *data_intf;
41 struct usb_device *usb;
42 unsigned int tx_pipe, rx_pipe;
43 u8 active_setting;
44 u8 disconnected;
45
46 unsigned tx_queue;
47 spinlock_t tx_lock;
48
49 spinlock_t rx_lock;
50 struct sk_buff *rx_skb;
51 struct urb *urbs[0];
52};
53
54static void tx_complete(struct urb *req);
55static void rx_complete(struct urb *req);
56
57
58
59
60static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev)
61{
62 struct usbpn_dev *pnd = netdev_priv(dev);
63 struct urb *req = NULL;
64 unsigned long flags;
65 int err;
66
67 if (skb->protocol != htons(ETH_P_PHONET))
68 goto drop;
69
70 req = usb_alloc_urb(0, GFP_ATOMIC);
71 if (!req)
72 goto drop;
73 usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len,
74 tx_complete, skb);
75 req->transfer_flags = URB_ZERO_PACKET;
76 err = usb_submit_urb(req, GFP_ATOMIC);
77 if (err) {
78 usb_free_urb(req);
79 goto drop;
80 }
81
82 spin_lock_irqsave(&pnd->tx_lock, flags);
83 pnd->tx_queue++;
84 if (pnd->tx_queue >= dev->tx_queue_len)
85 netif_stop_queue(dev);
86 spin_unlock_irqrestore(&pnd->tx_lock, flags);
87 return NETDEV_TX_OK;
88
89drop:
90 dev_kfree_skb(skb);
91 dev->stats.tx_dropped++;
92 return NETDEV_TX_OK;
93}
94
95static void tx_complete(struct urb *req)
96{
97 struct sk_buff *skb = req->context;
98 struct net_device *dev = skb->dev;
99 struct usbpn_dev *pnd = netdev_priv(dev);
100 int status = req->status;
101
102 switch (status) {
103 case 0:
104 dev->stats.tx_bytes += skb->len;
105 break;
106
107 case -ENOENT:
108 case -ECONNRESET:
109 case -ESHUTDOWN:
110 dev->stats.tx_aborted_errors++;
111 default:
112 dev->stats.tx_errors++;
113 dev_dbg(&dev->dev, "TX error (%d)\n", status);
114 }
115 dev->stats.tx_packets++;
116
117 spin_lock(&pnd->tx_lock);
118 pnd->tx_queue--;
119 netif_wake_queue(dev);
120 spin_unlock(&pnd->tx_lock);
121
122 dev_kfree_skb_any(skb);
123 usb_free_urb(req);
124}
125
126static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
127{
128 struct net_device *dev = pnd->dev;
129 struct page *page;
130 int err;
131
132 page = __netdev_alloc_page(dev, gfp_flags);
133 if (!page)
134 return -ENOMEM;
135
136 usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
137 PAGE_SIZE, rx_complete, dev);
138 req->transfer_flags = 0;
139 err = usb_submit_urb(req, gfp_flags);
140 if (unlikely(err)) {
141 dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
142 netdev_free_page(dev, page);
143 }
144 return err;
145}
146
147static void rx_complete(struct urb *req)
148{
149 struct net_device *dev = req->context;
150 struct usbpn_dev *pnd = netdev_priv(dev);
151 struct page *page = virt_to_page(req->transfer_buffer);
152 struct sk_buff *skb;
153 unsigned long flags;
154 int status = req->status;
155
156 switch (status) {
157 case 0:
158 spin_lock_irqsave(&pnd->rx_lock, flags);
159 skb = pnd->rx_skb;
160 if (!skb) {
161 skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
162 if (likely(skb)) {
163
164 memcpy(skb_put(skb, 1), page_address(page), 1);
165 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
166 page, 1, req->actual_length);
167 page = NULL;
168 }
169 } else {
170 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
171 page, 0, req->actual_length);
172 page = NULL;
173 }
174 if (req->actual_length < PAGE_SIZE)
175 pnd->rx_skb = NULL;
176 else
177 skb = NULL;
178 spin_unlock_irqrestore(&pnd->rx_lock, flags);
179 if (skb) {
180 skb->protocol = htons(ETH_P_PHONET);
181 skb_reset_mac_header(skb);
182 __skb_pull(skb, 1);
183 skb->dev = dev;
184 dev->stats.rx_packets++;
185 dev->stats.rx_bytes += skb->len;
186
187 netif_rx(skb);
188 }
189 goto resubmit;
190
191 case -ENOENT:
192 case -ECONNRESET:
193 case -ESHUTDOWN:
194 req = NULL;
195 break;
196
197 case -EOVERFLOW:
198 dev->stats.rx_over_errors++;
199 dev_dbg(&dev->dev, "RX overflow\n");
200 break;
201
202 case -EILSEQ:
203 dev->stats.rx_crc_errors++;
204 break;
205 }
206
207 dev->stats.rx_errors++;
208resubmit:
209 if (page)
210 netdev_free_page(dev, page);
211 if (req)
212 rx_submit(pnd, req, GFP_ATOMIC);
213}
214
215static int usbpn_close(struct net_device *dev);
216
217static int usbpn_open(struct net_device *dev)
218{
219 struct usbpn_dev *pnd = netdev_priv(dev);
220 int err;
221 unsigned i;
222 unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
223
224 err = usb_set_interface(pnd->usb, num, pnd->active_setting);
225 if (err)
226 return err;
227
228 for (i = 0; i < rxq_size; i++) {
229 struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
230
231 if (!req || rx_submit(pnd, req, GFP_KERNEL)) {
232 usbpn_close(dev);
233 return -ENOMEM;
234 }
235 pnd->urbs[i] = req;
236 }
237
238 netif_wake_queue(dev);
239 return 0;
240}
241
242static int usbpn_close(struct net_device *dev)
243{
244 struct usbpn_dev *pnd = netdev_priv(dev);
245 unsigned i;
246 unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
247
248 netif_stop_queue(dev);
249
250 for (i = 0; i < rxq_size; i++) {
251 struct urb *req = pnd->urbs[i];
252
253 if (!req)
254 continue;
255 usb_kill_urb(req);
256 usb_free_urb(req);
257 pnd->urbs[i] = NULL;
258 }
259
260 return usb_set_interface(pnd->usb, num, !pnd->active_setting);
261}
262
263static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
264{
265 struct if_phonet_req *req = (struct if_phonet_req *)ifr;
266
267 switch (cmd) {
268 case SIOCPNGAUTOCONF:
269 req->ifr_phonet_autoconf.device = PN_DEV_PC;
270 return 0;
271 }
272 return -ENOIOCTLCMD;
273}
274
275static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
276{
277 if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
278 return -EINVAL;
279
280 dev->mtu = new_mtu;
281 return 0;
282}
283
284static const struct net_device_ops usbpn_ops = {
285 .ndo_open = usbpn_open,
286 .ndo_stop = usbpn_close,
287 .ndo_start_xmit = usbpn_xmit,
288 .ndo_do_ioctl = usbpn_ioctl,
289 .ndo_change_mtu = usbpn_set_mtu,
290};
291
292static void usbpn_setup(struct net_device *dev)
293{
294 dev->features = 0;
295 dev->netdev_ops = &usbpn_ops,
296 dev->header_ops = &phonet_header_ops;
297 dev->type = ARPHRD_PHONET;
298 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
299 dev->mtu = PHONET_MAX_MTU;
300 dev->hard_header_len = 1;
301 dev->dev_addr[0] = PN_MEDIA_USB;
302 dev->addr_len = 1;
303 dev->tx_queue_len = 3;
304
305 dev->destructor = free_netdev;
306}
307
308
309
310
311static struct usb_device_id usbpn_ids[] = {
312 {
313 .match_flags = USB_DEVICE_ID_MATCH_VENDOR
314 | USB_DEVICE_ID_MATCH_INT_CLASS
315 | USB_DEVICE_ID_MATCH_INT_SUBCLASS,
316 .idVendor = 0x0421,
317 .bInterfaceClass = USB_CLASS_COMM,
318 .bInterfaceSubClass = 0xFE,
319 },
320 { },
321};
322
323MODULE_DEVICE_TABLE(usb, usbpn_ids);
324
325static struct usb_driver usbpn_driver;
326
327int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
328{
329 static const char ifname[] = "usbpn%d";
330 const struct usb_cdc_union_desc *union_header = NULL;
331 const struct usb_cdc_header_desc *phonet_header = NULL;
332 const struct usb_host_interface *data_desc;
333 struct usb_interface *data_intf;
334 struct usb_device *usbdev = interface_to_usbdev(intf);
335 struct net_device *dev;
336 struct usbpn_dev *pnd;
337 u8 *data;
338 int len, err;
339
340 data = intf->altsetting->extra;
341 len = intf->altsetting->extralen;
342 while (len >= 3) {
343 u8 dlen = data[0];
344 if (dlen < 3)
345 return -EINVAL;
346
347
348 if (data[1] == USB_DT_CS_INTERFACE) {
349
350 switch (data[2]) {
351 case USB_CDC_UNION_TYPE:
352 if (union_header || dlen < 5)
353 break;
354 union_header =
355 (struct usb_cdc_union_desc *)data;
356 break;
357 case 0xAB:
358 if (phonet_header || dlen < 5)
359 break;
360 phonet_header =
361 (struct usb_cdc_header_desc *)data;
362 break;
363 }
364 }
365 data += dlen;
366 len -= dlen;
367 }
368
369 if (!union_header || !phonet_header)
370 return -EINVAL;
371
372 data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
373 if (data_intf == NULL)
374 return -ENODEV;
375
376 if (data_intf->num_altsetting != 2)
377 return -EINVAL;
378 if (data_intf->altsetting[0].desc.bNumEndpoints == 0 &&
379 data_intf->altsetting[1].desc.bNumEndpoints == 2)
380 data_desc = data_intf->altsetting + 1;
381 else
382 if (data_intf->altsetting[0].desc.bNumEndpoints == 2 &&
383 data_intf->altsetting[1].desc.bNumEndpoints == 0)
384 data_desc = data_intf->altsetting;
385 else
386 return -EINVAL;
387
388 dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size,
389 ifname, usbpn_setup);
390 if (!dev)
391 return -ENOMEM;
392
393 pnd = netdev_priv(dev);
394 SET_NETDEV_DEV(dev, &intf->dev);
395 netif_stop_queue(dev);
396
397 pnd->dev = dev;
398 pnd->usb = usb_get_dev(usbdev);
399 pnd->intf = intf;
400 pnd->data_intf = data_intf;
401 spin_lock_init(&pnd->tx_lock);
402 spin_lock_init(&pnd->rx_lock);
403
404 if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
405 pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
406 data_desc->endpoint[0].desc.bEndpointAddress);
407 pnd->tx_pipe = usb_sndbulkpipe(usbdev,
408 data_desc->endpoint[1].desc.bEndpointAddress);
409 } else {
410 pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
411 data_desc->endpoint[1].desc.bEndpointAddress);
412 pnd->tx_pipe = usb_sndbulkpipe(usbdev,
413 data_desc->endpoint[0].desc.bEndpointAddress);
414 }
415 pnd->active_setting = data_desc - data_intf->altsetting;
416
417 err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
418 if (err)
419 goto out;
420
421
422 usb_set_interface(usbdev, union_header->bSlaveInterface0,
423 !pnd->active_setting);
424 usb_set_intfdata(intf, pnd);
425
426 err = register_netdev(dev);
427 if (err) {
428 usb_driver_release_interface(&usbpn_driver, data_intf);
429 goto out;
430 }
431
432 dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
433 return 0;
434
435out:
436 usb_set_intfdata(intf, NULL);
437 free_netdev(dev);
438 return err;
439}
440
441static void usbpn_disconnect(struct usb_interface *intf)
442{
443 struct usbpn_dev *pnd = usb_get_intfdata(intf);
444 struct usb_device *usb = pnd->usb;
445
446 if (pnd->disconnected)
447 return;
448
449 pnd->disconnected = 1;
450 usb_driver_release_interface(&usbpn_driver,
451 (pnd->intf == intf) ? pnd->data_intf : pnd->intf);
452 unregister_netdev(pnd->dev);
453 usb_put_dev(usb);
454}
455
456static struct usb_driver usbpn_driver = {
457 .name = "cdc_phonet",
458 .probe = usbpn_probe,
459 .disconnect = usbpn_disconnect,
460 .id_table = usbpn_ids,
461};
462
463static int __init usbpn_init(void)
464{
465 return usb_register(&usbpn_driver);
466}
467
468static void __exit usbpn_exit(void)
469{
470 usb_deregister(&usbpn_driver);
471}
472
473module_init(usbpn_init);
474module_exit(usbpn_exit);
475
476MODULE_AUTHOR("Remi Denis-Courmont");
477MODULE_DESCRIPTION("USB CDC Phonet host interface");
478MODULE_LICENSE("GPL");
479
