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