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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * f_phonet.c -- USB CDC Phonet function
4 *
5 * Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
6 *
7 * Author: Rémi Denis-Courmont
8 */
9
10#include <linux/mm.h>
11#include <linux/slab.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/device.h>
15
16#include <linux/netdevice.h>
17#include <linux/if_ether.h>
18#include <linux/if_phonet.h>
19#include <linux/if_arp.h>
20
21#include <linux/usb/ch9.h>
22#include <linux/usb/cdc.h>
23#include <linux/usb/composite.h>
24
25#include "u_phonet.h"
26#include "u_ether.h"
27
28#define PN_MEDIA_USB 0x1B
29#define MAXPACKET 512
30#if (PAGE_SIZE % MAXPACKET)
31#error MAXPACKET must divide PAGE_SIZE!
32#endif
33
34/*-------------------------------------------------------------------------*/
35
36struct phonet_port {
37 struct f_phonet *usb;
38 spinlock_t lock;
39};
40
41struct f_phonet {
42 struct usb_function function;
43 struct {
44 struct sk_buff *skb;
45 spinlock_t lock;
46 } rx;
47 struct net_device *dev;
48 struct usb_ep *in_ep, *out_ep;
49
50 struct usb_request *in_req;
51 struct usb_request *out_reqv[];
52};
53
54static int phonet_rxq_size = 17;
55
56static inline struct f_phonet *func_to_pn(struct usb_function *f)
57{
58 return container_of(f, struct f_phonet, function);
59}
60
61/*-------------------------------------------------------------------------*/
62
63#define USB_CDC_SUBCLASS_PHONET 0xfe
64#define USB_CDC_PHONET_TYPE 0xab
65
66static struct usb_interface_descriptor
67pn_control_intf_desc = {
68 .bLength = sizeof pn_control_intf_desc,
69 .bDescriptorType = USB_DT_INTERFACE,
70
71 /* .bInterfaceNumber = DYNAMIC, */
72 .bInterfaceClass = USB_CLASS_COMM,
73 .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
74};
75
76static const struct usb_cdc_header_desc
77pn_header_desc = {
78 .bLength = sizeof pn_header_desc,
79 .bDescriptorType = USB_DT_CS_INTERFACE,
80 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
81 .bcdCDC = cpu_to_le16(0x0110),
82};
83
84static const struct usb_cdc_header_desc
85pn_phonet_desc = {
86 .bLength = sizeof pn_phonet_desc,
87 .bDescriptorType = USB_DT_CS_INTERFACE,
88 .bDescriptorSubType = USB_CDC_PHONET_TYPE,
89 .bcdCDC = cpu_to_le16(0x1505), /* ??? */
90};
91
92static struct usb_cdc_union_desc
93pn_union_desc = {
94 .bLength = sizeof pn_union_desc,
95 .bDescriptorType = USB_DT_CS_INTERFACE,
96 .bDescriptorSubType = USB_CDC_UNION_TYPE,
97
98 /* .bMasterInterface0 = DYNAMIC, */
99 /* .bSlaveInterface0 = DYNAMIC, */
100};
101
102static struct usb_interface_descriptor
103pn_data_nop_intf_desc = {
104 .bLength = sizeof pn_data_nop_intf_desc,
105 .bDescriptorType = USB_DT_INTERFACE,
106
107 /* .bInterfaceNumber = DYNAMIC, */
108 .bAlternateSetting = 0,
109 .bNumEndpoints = 0,
110 .bInterfaceClass = USB_CLASS_CDC_DATA,
111};
112
113static struct usb_interface_descriptor
114pn_data_intf_desc = {
115 .bLength = sizeof pn_data_intf_desc,
116 .bDescriptorType = USB_DT_INTERFACE,
117
118 /* .bInterfaceNumber = DYNAMIC, */
119 .bAlternateSetting = 1,
120 .bNumEndpoints = 2,
121 .bInterfaceClass = USB_CLASS_CDC_DATA,
122};
123
124static struct usb_endpoint_descriptor
125pn_fs_sink_desc = {
126 .bLength = USB_DT_ENDPOINT_SIZE,
127 .bDescriptorType = USB_DT_ENDPOINT,
128
129 .bEndpointAddress = USB_DIR_OUT,
130 .bmAttributes = USB_ENDPOINT_XFER_BULK,
131};
132
133static struct usb_endpoint_descriptor
134pn_hs_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 .wMaxPacketSize = cpu_to_le16(MAXPACKET),
141};
142
143static struct usb_endpoint_descriptor
144pn_fs_source_desc = {
145 .bLength = USB_DT_ENDPOINT_SIZE,
146 .bDescriptorType = USB_DT_ENDPOINT,
147
148 .bEndpointAddress = USB_DIR_IN,
149 .bmAttributes = USB_ENDPOINT_XFER_BULK,
150};
151
152static struct usb_endpoint_descriptor
153pn_hs_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 .wMaxPacketSize = cpu_to_le16(512),
160};
161
162static struct usb_descriptor_header *fs_pn_function[] = {
163 (struct usb_descriptor_header *) &pn_control_intf_desc,
164 (struct usb_descriptor_header *) &pn_header_desc,
165 (struct usb_descriptor_header *) &pn_phonet_desc,
166 (struct usb_descriptor_header *) &pn_union_desc,
167 (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
168 (struct usb_descriptor_header *) &pn_data_intf_desc,
169 (struct usb_descriptor_header *) &pn_fs_sink_desc,
170 (struct usb_descriptor_header *) &pn_fs_source_desc,
171 NULL,
172};
173
174static struct usb_descriptor_header *hs_pn_function[] = {
175 (struct usb_descriptor_header *) &pn_control_intf_desc,
176 (struct usb_descriptor_header *) &pn_header_desc,
177 (struct usb_descriptor_header *) &pn_phonet_desc,
178 (struct usb_descriptor_header *) &pn_union_desc,
179 (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
180 (struct usb_descriptor_header *) &pn_data_intf_desc,
181 (struct usb_descriptor_header *) &pn_hs_sink_desc,
182 (struct usb_descriptor_header *) &pn_hs_source_desc,
183 NULL,
184};
185
186/*-------------------------------------------------------------------------*/
187
188static int pn_net_open(struct net_device *dev)
189{
190 netif_wake_queue(dev);
191 return 0;
192}
193
194static int pn_net_close(struct net_device *dev)
195{
196 netif_stop_queue(dev);
197 return 0;
198}
199
200static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
201{
202 struct f_phonet *fp = ep->driver_data;
203 struct net_device *dev = fp->dev;
204 struct sk_buff *skb = req->context;
205
206 switch (req->status) {
207 case 0:
208 dev->stats.tx_packets++;
209 dev->stats.tx_bytes += skb->len;
210 break;
211
212 case -ESHUTDOWN: /* disconnected */
213 case -ECONNRESET: /* disabled */
214 dev->stats.tx_aborted_errors++;
215 fallthrough;
216 default:
217 dev->stats.tx_errors++;
218 }
219
220 dev_kfree_skb_any(skb);
221 netif_wake_queue(dev);
222}
223
224static netdev_tx_t pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
225{
226 struct phonet_port *port = netdev_priv(dev);
227 struct f_phonet *fp;
228 struct usb_request *req;
229 unsigned long flags;
230
231 if (skb->protocol != htons(ETH_P_PHONET))
232 goto out;
233
234 spin_lock_irqsave(&port->lock, flags);
235 fp = port->usb;
236 if (unlikely(!fp)) /* race with carrier loss */
237 goto out_unlock;
238
239 req = fp->in_req;
240 req->buf = skb->data;
241 req->length = skb->len;
242 req->complete = pn_tx_complete;
243 req->zero = 1;
244 req->context = skb;
245
246 if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
247 goto out_unlock;
248
249 netif_stop_queue(dev);
250 skb = NULL;
251
252out_unlock:
253 spin_unlock_irqrestore(&port->lock, flags);
254out:
255 if (unlikely(skb)) {
256 dev_kfree_skb(skb);
257 dev->stats.tx_dropped++;
258 }
259 return NETDEV_TX_OK;
260}
261
262static const struct net_device_ops pn_netdev_ops = {
263 .ndo_open = pn_net_open,
264 .ndo_stop = pn_net_close,
265 .ndo_start_xmit = pn_net_xmit,
266};
267
268static void pn_net_setup(struct net_device *dev)
269{
270 const u8 addr = PN_MEDIA_USB;
271
272 dev->features = 0;
273 dev->type = ARPHRD_PHONET;
274 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
275 dev->mtu = PHONET_DEV_MTU;
276 dev->min_mtu = PHONET_MIN_MTU;
277 dev->max_mtu = PHONET_MAX_MTU;
278 dev->hard_header_len = 1;
279 dev->addr_len = 1;
280 dev_addr_set(dev, &addr);
281
282 dev->tx_queue_len = 1;
283
284 dev->netdev_ops = &pn_netdev_ops;
285 dev->needs_free_netdev = true;
286 dev->header_ops = &phonet_header_ops;
287}
288
289/*-------------------------------------------------------------------------*/
290
291/*
292 * Queue buffer for data from the host
293 */
294static int
295pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
296{
297 struct page *page;
298 int err;
299
300 page = __dev_alloc_page(gfp_flags | __GFP_NOMEMALLOC);
301 if (!page)
302 return -ENOMEM;
303
304 req->buf = page_address(page);
305 req->length = PAGE_SIZE;
306 req->context = page;
307
308 err = usb_ep_queue(fp->out_ep, req, gfp_flags);
309 if (unlikely(err))
310 put_page(page);
311 return err;
312}
313
314static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
315{
316 struct f_phonet *fp = ep->driver_data;
317 struct net_device *dev = fp->dev;
318 struct page *page = req->context;
319 struct sk_buff *skb;
320 unsigned long flags;
321 int status = req->status;
322
323 switch (status) {
324 case 0:
325 spin_lock_irqsave(&fp->rx.lock, flags);
326 skb = fp->rx.skb;
327 if (!skb)
328 skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
329 if (req->actual < req->length) /* Last fragment */
330 fp->rx.skb = NULL;
331 spin_unlock_irqrestore(&fp->rx.lock, flags);
332
333 if (unlikely(!skb))
334 break;
335
336 if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) {
337 /* Frame count from host exceeds frags[] capacity */
338 dev_kfree_skb_any(skb);
339 if (fp->rx.skb == skb)
340 fp->rx.skb = NULL;
341 dev->stats.rx_length_errors++;
342 break;
343 }
344
345 if (skb->len == 0) { /* First fragment */
346 skb->protocol = htons(ETH_P_PHONET);
347 skb_reset_mac_header(skb);
348 /* Can't use pskb_pull() on page in IRQ */
349 skb_put_data(skb, page_address(page), 1);
350 }
351
352 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
353 skb->len <= 1, req->actual, PAGE_SIZE);
354 page = NULL;
355
356 if (req->actual < req->length) { /* Last fragment */
357 skb->dev = dev;
358 dev->stats.rx_packets++;
359 dev->stats.rx_bytes += skb->len;
360
361 netif_rx(skb);
362 }
363 break;
364
365 /* Do not resubmit in these cases: */
366 case -ESHUTDOWN: /* disconnect */
367 case -ECONNABORTED: /* hw reset */
368 case -ECONNRESET: /* dequeued (unlink or netif down) */
369 req = NULL;
370 break;
371
372 /* Do resubmit in these cases: */
373 case -EOVERFLOW: /* request buffer overflow */
374 dev->stats.rx_over_errors++;
375 fallthrough;
376 default:
377 dev->stats.rx_errors++;
378 break;
379 }
380
381 if (page)
382 put_page(page);
383 if (req)
384 pn_rx_submit(fp, req, GFP_ATOMIC);
385}
386
387/*-------------------------------------------------------------------------*/
388
389static void __pn_reset(struct usb_function *f)
390{
391 struct f_phonet *fp = func_to_pn(f);
392 struct net_device *dev = fp->dev;
393 struct phonet_port *port = netdev_priv(dev);
394
395 netif_carrier_off(dev);
396 port->usb = NULL;
397
398 usb_ep_disable(fp->out_ep);
399 usb_ep_disable(fp->in_ep);
400 if (fp->rx.skb) {
401 dev_kfree_skb_irq(fp->rx.skb);
402 fp->rx.skb = NULL;
403 }
404}
405
406static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
407{
408 struct f_phonet *fp = func_to_pn(f);
409 struct usb_gadget *gadget = fp->function.config->cdev->gadget;
410
411 if (intf == pn_control_intf_desc.bInterfaceNumber)
412 /* control interface, no altsetting */
413 return (alt > 0) ? -EINVAL : 0;
414
415 if (intf == pn_data_intf_desc.bInterfaceNumber) {
416 struct net_device *dev = fp->dev;
417 struct phonet_port *port = netdev_priv(dev);
418
419 /* data intf (0: inactive, 1: active) */
420 if (alt > 1)
421 return -EINVAL;
422
423 spin_lock(&port->lock);
424
425 if (fp->in_ep->enabled)
426 __pn_reset(f);
427
428 if (alt == 1) {
429 int i;
430
431 if (config_ep_by_speed(gadget, f, fp->in_ep) ||
432 config_ep_by_speed(gadget, f, fp->out_ep)) {
433 fp->in_ep->desc = NULL;
434 fp->out_ep->desc = NULL;
435 spin_unlock(&port->lock);
436 return -EINVAL;
437 }
438 usb_ep_enable(fp->out_ep);
439 usb_ep_enable(fp->in_ep);
440
441 port->usb = fp;
442 fp->out_ep->driver_data = fp;
443 fp->in_ep->driver_data = fp;
444
445 netif_carrier_on(dev);
446 for (i = 0; i < phonet_rxq_size; i++)
447 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC);
448 }
449 spin_unlock(&port->lock);
450 return 0;
451 }
452
453 return -EINVAL;
454}
455
456static int pn_get_alt(struct usb_function *f, unsigned intf)
457{
458 struct f_phonet *fp = func_to_pn(f);
459
460 if (intf == pn_control_intf_desc.bInterfaceNumber)
461 return 0;
462
463 if (intf == pn_data_intf_desc.bInterfaceNumber) {
464 struct phonet_port *port = netdev_priv(fp->dev);
465 u8 alt;
466
467 spin_lock(&port->lock);
468 alt = port->usb != NULL;
469 spin_unlock(&port->lock);
470 return alt;
471 }
472
473 return -EINVAL;
474}
475
476static void pn_disconnect(struct usb_function *f)
477{
478 struct f_phonet *fp = func_to_pn(f);
479 struct phonet_port *port = netdev_priv(fp->dev);
480 unsigned long flags;
481
482 /* remain disabled until set_alt */
483 spin_lock_irqsave(&port->lock, flags);
484 __pn_reset(f);
485 spin_unlock_irqrestore(&port->lock, flags);
486}
487
488/*-------------------------------------------------------------------------*/
489
490static int pn_bind(struct usb_configuration *c, struct usb_function *f)
491{
492 struct usb_composite_dev *cdev = c->cdev;
493 struct usb_gadget *gadget = cdev->gadget;
494 struct f_phonet *fp = func_to_pn(f);
495 struct usb_ep *ep;
496 int status, i;
497
498 struct f_phonet_opts *phonet_opts;
499
500 phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst);
501
502 /*
503 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
504 * configurations are bound in sequence with list_for_each_entry,
505 * in each configuration its functions are bound in sequence
506 * with list_for_each_entry, so we assume no race condition
507 * with regard to phonet_opts->bound access
508 */
509 if (!phonet_opts->bound) {
510 gphonet_set_gadget(phonet_opts->net, gadget);
511 status = gphonet_register_netdev(phonet_opts->net);
512 if (status)
513 return status;
514 phonet_opts->bound = true;
515 }
516
517 /* Reserve interface IDs */
518 status = usb_interface_id(c, f);
519 if (status < 0)
520 goto err;
521 pn_control_intf_desc.bInterfaceNumber = status;
522 pn_union_desc.bMasterInterface0 = status;
523
524 status = usb_interface_id(c, f);
525 if (status < 0)
526 goto err;
527 pn_data_nop_intf_desc.bInterfaceNumber = status;
528 pn_data_intf_desc.bInterfaceNumber = status;
529 pn_union_desc.bSlaveInterface0 = status;
530
531 /* Reserve endpoints */
532 status = -ENODEV;
533 ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
534 if (!ep)
535 goto err;
536 fp->out_ep = ep;
537
538 ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
539 if (!ep)
540 goto err;
541 fp->in_ep = ep;
542
543 pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
544 pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
545
546 /* Do not try to bind Phonet twice... */
547 status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
548 NULL, NULL);
549 if (status)
550 goto err;
551
552 /* Incoming USB requests */
553 status = -ENOMEM;
554 for (i = 0; i < phonet_rxq_size; i++) {
555 struct usb_request *req;
556
557 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
558 if (!req)
559 goto err_req;
560
561 req->complete = pn_rx_complete;
562 fp->out_reqv[i] = req;
563 }
564
565 /* Outgoing USB requests */
566 fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
567 if (!fp->in_req)
568 goto err_req;
569
570 INFO(cdev, "USB CDC Phonet function\n");
571 INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
572 fp->out_ep->name, fp->in_ep->name);
573 return 0;
574
575err_req:
576 for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
577 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
578 usb_free_all_descriptors(f);
579err:
580 ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
581 return status;
582}
583
584static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item)
585{
586 return container_of(to_config_group(item), struct f_phonet_opts,
587 func_inst.group);
588}
589
590static void phonet_attr_release(struct config_item *item)
591{
592 struct f_phonet_opts *opts = to_f_phonet_opts(item);
593
594 usb_put_function_instance(&opts->func_inst);
595}
596
597static const struct configfs_item_operations phonet_item_ops = {
598 .release = phonet_attr_release,
599};
600
601static ssize_t f_phonet_ifname_show(struct config_item *item, char *page)
602{
603 return gether_get_ifname(to_f_phonet_opts(item)->net, page, PAGE_SIZE);
604}
605
606CONFIGFS_ATTR_RO(f_phonet_, ifname);
607
608static struct configfs_attribute *phonet_attrs[] = {
609 &f_phonet_attr_ifname,
610 NULL,
611};
612
613static const struct config_item_type phonet_func_type = {
614 .ct_item_ops = &phonet_item_ops,
615 .ct_attrs = phonet_attrs,
616 .ct_owner = THIS_MODULE,
617};
618
619static void phonet_free_inst(struct usb_function_instance *f)
620{
621 struct f_phonet_opts *opts;
622
623 opts = container_of(f, struct f_phonet_opts, func_inst);
624 if (opts->bound)
625 gphonet_cleanup(opts->net);
626 else
627 free_netdev(opts->net);
628 kfree(opts);
629}
630
631static struct usb_function_instance *phonet_alloc_inst(void)
632{
633 struct f_phonet_opts *opts;
634
635 opts = kzalloc_obj(*opts);
636 if (!opts)
637 return ERR_PTR(-ENOMEM);
638
639 opts->func_inst.free_func_inst = phonet_free_inst;
640 opts->net = gphonet_setup_default();
641 if (IS_ERR(opts->net)) {
642 struct net_device *net = opts->net;
643 kfree(opts);
644 return ERR_CAST(net);
645 }
646
647 config_group_init_type_name(&opts->func_inst.group, "",
648 &phonet_func_type);
649
650 return &opts->func_inst;
651}
652
653static void phonet_free(struct usb_function *f)
654{
655 struct f_phonet *phonet;
656
657 phonet = func_to_pn(f);
658 kfree(phonet);
659}
660
661static void pn_unbind(struct usb_configuration *c, struct usb_function *f)
662{
663 struct f_phonet *fp = func_to_pn(f);
664 int i;
665
666 /* We are already disconnected */
667 if (fp->in_req)
668 usb_ep_free_request(fp->in_ep, fp->in_req);
669 for (i = 0; i < phonet_rxq_size; i++)
670 if (fp->out_reqv[i])
671 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
672
673 usb_free_all_descriptors(f);
674}
675
676static struct usb_function *phonet_alloc(struct usb_function_instance *fi)
677{
678 struct f_phonet *fp;
679 struct f_phonet_opts *opts;
680
681 fp = kzalloc_flex(*fp, out_reqv, phonet_rxq_size);
682 if (!fp)
683 return ERR_PTR(-ENOMEM);
684
685 opts = container_of(fi, struct f_phonet_opts, func_inst);
686
687 fp->dev = opts->net;
688 fp->function.name = "phonet";
689 fp->function.bind = pn_bind;
690 fp->function.unbind = pn_unbind;
691 fp->function.set_alt = pn_set_alt;
692 fp->function.get_alt = pn_get_alt;
693 fp->function.disable = pn_disconnect;
694 fp->function.free_func = phonet_free;
695 spin_lock_init(&fp->rx.lock);
696
697 return &fp->function;
698}
699
700struct net_device *gphonet_setup_default(void)
701{
702 struct net_device *dev;
703 struct phonet_port *port;
704
705 /* Create net device */
706 dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN,
707 pn_net_setup);
708 if (!dev)
709 return ERR_PTR(-ENOMEM);
710
711 port = netdev_priv(dev);
712 spin_lock_init(&port->lock);
713 netif_carrier_off(dev);
714
715 return dev;
716}
717
718void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g)
719{
720 SET_NETDEV_DEV(net, &g->dev);
721}
722
723int gphonet_register_netdev(struct net_device *net)
724{
725 int status;
726
727 status = register_netdev(net);
728 if (status)
729 free_netdev(net);
730
731 return status;
732}
733
734void gphonet_cleanup(struct net_device *dev)
735{
736 unregister_netdev(dev);
737}
738
739DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc);
740MODULE_AUTHOR("Rémi Denis-Courmont");
741MODULE_DESCRIPTION("USB CDC Phonet function");
742MODULE_LICENSE("GPL");