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23#include <linux/kernel.h>
24#include <linux/device.h>
25
26#include <linux/netdevice.h>
27#include <linux/if_ether.h>
28#include <linux/if_phonet.h>
29#include <linux/if_arp.h>
30
31#include <linux/usb/ch9.h>
32#include <linux/usb/cdc.h>
33#include <linux/usb/composite.h>
34
35#include "u_phonet.h"
36
37#define PN_MEDIA_USB 0x1B
38#define MAXPACKET 512
39#if (PAGE_SIZE % MAXPACKET)
40#error MAXPACKET must divide PAGE_SIZE!
41#endif
42
43
44
45struct phonet_port {
46 struct f_phonet *usb;
47 spinlock_t lock;
48};
49
50struct f_phonet {
51 struct usb_function function;
52 struct {
53 struct sk_buff *skb;
54 spinlock_t lock;
55 } rx;
56 struct net_device *dev;
57 struct usb_ep *in_ep, *out_ep;
58
59 struct usb_request *in_req;
60 struct usb_request *out_reqv[0];
61};
62
63static int phonet_rxq_size = 17;
64
65static inline struct f_phonet *func_to_pn(struct usb_function *f)
66{
67 return container_of(f, struct f_phonet, function);
68}
69
70
71
72#define USB_CDC_SUBCLASS_PHONET 0xfe
73#define USB_CDC_PHONET_TYPE 0xab
74
75static struct usb_interface_descriptor
76pn_control_intf_desc = {
77 .bLength = sizeof pn_control_intf_desc,
78 .bDescriptorType = USB_DT_INTERFACE,
79
80
81 .bInterfaceClass = USB_CLASS_COMM,
82 .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
83};
84
85static const struct usb_cdc_header_desc
86pn_header_desc = {
87 .bLength = sizeof pn_header_desc,
88 .bDescriptorType = USB_DT_CS_INTERFACE,
89 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
90 .bcdCDC = cpu_to_le16(0x0110),
91};
92
93static const struct usb_cdc_header_desc
94pn_phonet_desc = {
95 .bLength = sizeof pn_phonet_desc,
96 .bDescriptorType = USB_DT_CS_INTERFACE,
97 .bDescriptorSubType = USB_CDC_PHONET_TYPE,
98 .bcdCDC = cpu_to_le16(0x1505),
99};
100
101static struct usb_cdc_union_desc
102pn_union_desc = {
103 .bLength = sizeof pn_union_desc,
104 .bDescriptorType = USB_DT_CS_INTERFACE,
105 .bDescriptorSubType = USB_CDC_UNION_TYPE,
106
107
108
109};
110
111static struct usb_interface_descriptor
112pn_data_nop_intf_desc = {
113 .bLength = sizeof pn_data_nop_intf_desc,
114 .bDescriptorType = USB_DT_INTERFACE,
115
116
117 .bAlternateSetting = 0,
118 .bNumEndpoints = 0,
119 .bInterfaceClass = USB_CLASS_CDC_DATA,
120};
121
122static struct usb_interface_descriptor
123pn_data_intf_desc = {
124 .bLength = sizeof pn_data_intf_desc,
125 .bDescriptorType = USB_DT_INTERFACE,
126
127
128 .bAlternateSetting = 1,
129 .bNumEndpoints = 2,
130 .bInterfaceClass = USB_CLASS_CDC_DATA,
131};
132
133static struct usb_endpoint_descriptor
134pn_fs_sink_desc = {
135 .bLength = USB_DT_ENDPOINT_SIZE,
136 .bDescriptorType = USB_DT_ENDPOINT,
137
138 .bEndpointAddress = USB_DIR_OUT,
139 .bmAttributes = USB_ENDPOINT_XFER_BULK,
140};
141
142static struct usb_endpoint_descriptor
143pn_hs_sink_desc = {
144 .bLength = USB_DT_ENDPOINT_SIZE,
145 .bDescriptorType = USB_DT_ENDPOINT,
146
147 .bEndpointAddress = USB_DIR_OUT,
148 .bmAttributes = USB_ENDPOINT_XFER_BULK,
149 .wMaxPacketSize = cpu_to_le16(MAXPACKET),
150};
151
152static struct usb_endpoint_descriptor
153pn_fs_source_desc = {
154 .bLength = USB_DT_ENDPOINT_SIZE,
155 .bDescriptorType = USB_DT_ENDPOINT,
156
157 .bEndpointAddress = USB_DIR_IN,
158 .bmAttributes = USB_ENDPOINT_XFER_BULK,
159};
160
161static struct usb_endpoint_descriptor
162pn_hs_source_desc = {
163 .bLength = USB_DT_ENDPOINT_SIZE,
164 .bDescriptorType = USB_DT_ENDPOINT,
165
166 .bEndpointAddress = USB_DIR_IN,
167 .bmAttributes = USB_ENDPOINT_XFER_BULK,
168 .wMaxPacketSize = cpu_to_le16(512),
169};
170
171static struct usb_descriptor_header *fs_pn_function[] = {
172 (struct usb_descriptor_header *) &pn_control_intf_desc,
173 (struct usb_descriptor_header *) &pn_header_desc,
174 (struct usb_descriptor_header *) &pn_phonet_desc,
175 (struct usb_descriptor_header *) &pn_union_desc,
176 (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
177 (struct usb_descriptor_header *) &pn_data_intf_desc,
178 (struct usb_descriptor_header *) &pn_fs_sink_desc,
179 (struct usb_descriptor_header *) &pn_fs_source_desc,
180 NULL,
181};
182
183static struct usb_descriptor_header *hs_pn_function[] = {
184 (struct usb_descriptor_header *) &pn_control_intf_desc,
185 (struct usb_descriptor_header *) &pn_header_desc,
186 (struct usb_descriptor_header *) &pn_phonet_desc,
187 (struct usb_descriptor_header *) &pn_union_desc,
188 (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
189 (struct usb_descriptor_header *) &pn_data_intf_desc,
190 (struct usb_descriptor_header *) &pn_hs_sink_desc,
191 (struct usb_descriptor_header *) &pn_hs_source_desc,
192 NULL,
193};
194
195
196
197static int pn_net_open(struct net_device *dev)
198{
199 netif_wake_queue(dev);
200 return 0;
201}
202
203static int pn_net_close(struct net_device *dev)
204{
205 netif_stop_queue(dev);
206 return 0;
207}
208
209static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
210{
211 struct f_phonet *fp = ep->driver_data;
212 struct net_device *dev = fp->dev;
213 struct sk_buff *skb = req->context;
214
215 switch (req->status) {
216 case 0:
217 dev->stats.tx_packets++;
218 dev->stats.tx_bytes += skb->len;
219 break;
220
221 case -ESHUTDOWN:
222 case -ECONNRESET:
223 dev->stats.tx_aborted_errors++;
224 default:
225 dev->stats.tx_errors++;
226 }
227
228 dev_kfree_skb_any(skb);
229 netif_wake_queue(dev);
230}
231
232static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
233{
234 struct phonet_port *port = netdev_priv(dev);
235 struct f_phonet *fp;
236 struct usb_request *req;
237 unsigned long flags;
238
239 if (skb->protocol != htons(ETH_P_PHONET))
240 goto out;
241
242 spin_lock_irqsave(&port->lock, flags);
243 fp = port->usb;
244 if (unlikely(!fp))
245 goto out_unlock;
246
247 req = fp->in_req;
248 req->buf = skb->data;
249 req->length = skb->len;
250 req->complete = pn_tx_complete;
251 req->zero = 1;
252 req->context = skb;
253
254 if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
255 goto out_unlock;
256
257 netif_stop_queue(dev);
258 skb = NULL;
259
260out_unlock:
261 spin_unlock_irqrestore(&port->lock, flags);
262out:
263 if (unlikely(skb)) {
264 dev_kfree_skb(skb);
265 dev->stats.tx_dropped++;
266 }
267 return NETDEV_TX_OK;
268}
269
270static int pn_net_mtu(struct net_device *dev, int new_mtu)
271{
272 if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
273 return -EINVAL;
274 dev->mtu = new_mtu;
275 return 0;
276}
277
278static const struct net_device_ops pn_netdev_ops = {
279 .ndo_open = pn_net_open,
280 .ndo_stop = pn_net_close,
281 .ndo_start_xmit = pn_net_xmit,
282 .ndo_change_mtu = pn_net_mtu,
283};
284
285static void pn_net_setup(struct net_device *dev)
286{
287 dev->features = 0;
288 dev->type = ARPHRD_PHONET;
289 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
290 dev->mtu = PHONET_DEV_MTU;
291 dev->hard_header_len = 1;
292 dev->dev_addr[0] = PN_MEDIA_USB;
293 dev->addr_len = 1;
294 dev->tx_queue_len = 1;
295
296 dev->netdev_ops = &pn_netdev_ops;
297 dev->destructor = free_netdev;
298 dev->header_ops = &phonet_header_ops;
299}
300
301
302
303
304
305
306static int
307pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
308{
309 struct net_device *dev = fp->dev;
310 struct page *page;
311 int err;
312
313 page = __netdev_alloc_page(dev, gfp_flags);
314 if (!page)
315 return -ENOMEM;
316
317 req->buf = page_address(page);
318 req->length = PAGE_SIZE;
319 req->context = page;
320
321 err = usb_ep_queue(fp->out_ep, req, gfp_flags);
322 if (unlikely(err))
323 netdev_free_page(dev, page);
324 return err;
325}
326
327static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
328{
329 struct f_phonet *fp = ep->driver_data;
330 struct net_device *dev = fp->dev;
331 struct page *page = req->context;
332 struct sk_buff *skb;
333 unsigned long flags;
334 int status = req->status;
335
336 switch (status) {
337 case 0:
338 spin_lock_irqsave(&fp->rx.lock, flags);
339 skb = fp->rx.skb;
340 if (!skb)
341 skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
342 if (req->actual < req->length)
343 fp->rx.skb = NULL;
344 spin_unlock_irqrestore(&fp->rx.lock, flags);
345
346 if (unlikely(!skb))
347 break;
348 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, 0,
349 req->actual);
350 page = NULL;
351
352 if (req->actual < req->length) {
353 skb->protocol = htons(ETH_P_PHONET);
354 skb_reset_mac_header(skb);
355 pskb_pull(skb, 1);
356 skb->dev = dev;
357 dev->stats.rx_packets++;
358 dev->stats.rx_bytes += skb->len;
359
360 netif_rx(skb);
361 }
362 break;
363
364
365 case -ESHUTDOWN:
366 case -ECONNABORTED:
367 case -ECONNRESET:
368 req = NULL;
369 break;
370
371
372 case -EOVERFLOW:
373 dev->stats.rx_over_errors++;
374 default:
375 dev->stats.rx_errors++;
376 break;
377 }
378
379 if (page)
380 netdev_free_page(dev, page);
381 if (req)
382 pn_rx_submit(fp, req, GFP_ATOMIC);
383}
384
385
386
387static void __pn_reset(struct usb_function *f)
388{
389 struct f_phonet *fp = func_to_pn(f);
390 struct net_device *dev = fp->dev;
391 struct phonet_port *port = netdev_priv(dev);
392
393 netif_carrier_off(dev);
394 port->usb = NULL;
395
396 usb_ep_disable(fp->out_ep);
397 usb_ep_disable(fp->in_ep);
398 if (fp->rx.skb) {
399 dev_kfree_skb_irq(fp->rx.skb);
400 fp->rx.skb = NULL;
401 }
402}
403
404static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
405{
406 struct f_phonet *fp = func_to_pn(f);
407 struct usb_gadget *gadget = fp->function.config->cdev->gadget;
408
409 if (intf == pn_control_intf_desc.bInterfaceNumber)
410
411 return (alt > 0) ? -EINVAL : 0;
412
413 if (intf == pn_data_intf_desc.bInterfaceNumber) {
414 struct net_device *dev = fp->dev;
415 struct phonet_port *port = netdev_priv(dev);
416
417
418 if (alt > 1)
419 return -EINVAL;
420
421 spin_lock(&port->lock);
422 __pn_reset(f);
423 if (alt == 1) {
424 struct usb_endpoint_descriptor *out, *in;
425 int i;
426
427 out = ep_choose(gadget,
428 &pn_hs_sink_desc,
429 &pn_fs_sink_desc);
430 in = ep_choose(gadget,
431 &pn_hs_source_desc,
432 &pn_fs_source_desc);
433 usb_ep_enable(fp->out_ep, out);
434 usb_ep_enable(fp->in_ep, in);
435
436 port->usb = fp;
437 fp->out_ep->driver_data = fp;
438 fp->in_ep->driver_data = fp;
439
440 netif_carrier_on(dev);
441 for (i = 0; i < phonet_rxq_size; i++)
442 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
443 }
444 spin_unlock(&port->lock);
445 return 0;
446 }
447
448 return -EINVAL;
449}
450
451static int pn_get_alt(struct usb_function *f, unsigned intf)
452{
453 struct f_phonet *fp = func_to_pn(f);
454
455 if (intf == pn_control_intf_desc.bInterfaceNumber)
456 return 0;
457
458 if (intf == pn_data_intf_desc.bInterfaceNumber) {
459 struct phonet_port *port = netdev_priv(fp->dev);
460 u8 alt;
461
462 spin_lock(&port->lock);
463 alt = port->usb != NULL;
464 spin_unlock(&port->lock);
465 return alt;
466 }
467
468 return -EINVAL;
469}
470
471static void pn_disconnect(struct usb_function *f)
472{
473 struct f_phonet *fp = func_to_pn(f);
474 struct phonet_port *port = netdev_priv(fp->dev);
475 unsigned long flags;
476
477
478 spin_lock_irqsave(&port->lock, flags);
479 __pn_reset(f);
480 spin_unlock_irqrestore(&port->lock, flags);
481}
482
483
484
485static __init
486int pn_bind(struct usb_configuration *c, struct usb_function *f)
487{
488 struct usb_composite_dev *cdev = c->cdev;
489 struct usb_gadget *gadget = cdev->gadget;
490 struct f_phonet *fp = func_to_pn(f);
491 struct usb_ep *ep;
492 int status, i;
493
494
495 status = usb_interface_id(c, f);
496 if (status < 0)
497 goto err;
498 pn_control_intf_desc.bInterfaceNumber = status;
499 pn_union_desc.bMasterInterface0 = status;
500
501 status = usb_interface_id(c, f);
502 if (status < 0)
503 goto err;
504 pn_data_nop_intf_desc.bInterfaceNumber = status;
505 pn_data_intf_desc.bInterfaceNumber = status;
506 pn_union_desc.bSlaveInterface0 = status;
507
508
509 status = -ENODEV;
510 ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
511 if (!ep)
512 goto err;
513 fp->out_ep = ep;
514 ep->driver_data = fp;
515
516 ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
517 if (!ep)
518 goto err;
519 fp->in_ep = ep;
520 ep->driver_data = fp;
521
522 pn_hs_sink_desc.bEndpointAddress =
523 pn_fs_sink_desc.bEndpointAddress;
524 pn_hs_source_desc.bEndpointAddress =
525 pn_fs_source_desc.bEndpointAddress;
526
527
528 fp->function.descriptors = fs_pn_function;
529 fp->function.hs_descriptors = hs_pn_function;
530
531
532 status = -ENOMEM;
533 for (i = 0; i < phonet_rxq_size; i++) {
534 struct usb_request *req;
535
536 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
537 if (!req)
538 goto err;
539
540 req->complete = pn_rx_complete;
541 fp->out_reqv[i] = req;
542 }
543
544
545 fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
546 if (!fp->in_req)
547 goto err;
548
549 INFO(cdev, "USB CDC Phonet function\n");
550 INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
551 fp->out_ep->name, fp->in_ep->name);
552 return 0;
553
554err:
555 if (fp->out_ep)
556 fp->out_ep->driver_data = NULL;
557 if (fp->in_ep)
558 fp->in_ep->driver_data = NULL;
559 ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
560 return status;
561}
562
563static void
564pn_unbind(struct usb_configuration *c, struct usb_function *f)
565{
566 struct f_phonet *fp = func_to_pn(f);
567 int i;
568
569
570 if (fp->in_req)
571 usb_ep_free_request(fp->in_ep, fp->in_req);
572 for (i = 0; i < phonet_rxq_size; i++)
573 if (fp->out_reqv[i])
574 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
575
576 kfree(fp);
577}
578
579
580
581static struct net_device *dev;
582
583int __init phonet_bind_config(struct usb_configuration *c)
584{
585 struct f_phonet *fp;
586 int err, size;
587
588 size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
589 fp = kzalloc(size, GFP_KERNEL);
590 if (!fp)
591 return -ENOMEM;
592
593 fp->dev = dev;
594 fp->function.name = "phonet";
595 fp->function.bind = pn_bind;
596 fp->function.unbind = pn_unbind;
597 fp->function.set_alt = pn_set_alt;
598 fp->function.get_alt = pn_get_alt;
599 fp->function.disable = pn_disconnect;
600 spin_lock_init(&fp->rx.lock);
601
602 err = usb_add_function(c, &fp->function);
603 if (err)
604 kfree(fp);
605 return err;
606}
607
608int __init gphonet_setup(struct usb_gadget *gadget)
609{
610 struct phonet_port *port;
611 int err;
612
613
614 BUG_ON(dev);
615 dev = alloc_netdev(sizeof(*port), "upnlink%d", pn_net_setup);
616 if (!dev)
617 return -ENOMEM;
618
619 port = netdev_priv(dev);
620 spin_lock_init(&port->lock);
621 netif_carrier_off(dev);
622 SET_NETDEV_DEV(dev, &gadget->dev);
623
624 err = register_netdev(dev);
625 if (err)
626 free_netdev(dev);
627 return err;
628}
629
630void gphonet_cleanup(void)
631{
632 unregister_netdev(dev);
633}
634
