1 /*
2 * f_phonet.c -- USB CDC Phonet function
3 *
4 * Copyright (C) 2007-2008 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
13 #include <linux/mm.h>
14 #include <linux/slab.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/device.h>
18
19 #include <linux/netdevice.h>
20 #include <linux/if_ether.h>
21 #include <linux/if_phonet.h>
22 #include <linux/if_arp.h>
23
24 #include <linux/usb/ch9.h>
25 #include <linux/usb/cdc.h>
26 #include <linux/usb/composite.h>
27
28 #include "u_phonet.h"
29 #include "u_ether.h"
30
31 #define PN_MEDIA_USB 0x1B
32 #define MAXPACKET 512
33 #if (PAGE_SIZE % MAXPACKET)
34 #error MAXPACKET must divide PAGE_SIZE!
35 #endif
36
37 /*-------------------------------------------------------------------------*/
38
39 struct phonet_port {
40 struct f_phonet *usb;
41 spinlock_t lock;
42 };
43
44 struct f_phonet {
45 struct usb_function function;
46 struct {
47 struct sk_buff *skb;
48 spinlock_t lock;
49 } rx;
50 struct net_device *dev;
51 struct usb_ep *in_ep, *out_ep;
52
53 struct usb_request *in_req;
54 struct usb_request *out_reqv[0];
55 };
56
57 static int phonet_rxq_size = 17;
58
func_to_pn(struct usb_function * f)59 static inline struct f_phonet *func_to_pn(struct usb_function *f)
60 {
61 return container_of(f, struct f_phonet, function);
62 }
63
64 /*-------------------------------------------------------------------------*/
65
66 #define USB_CDC_SUBCLASS_PHONET 0xfe
67 #define USB_CDC_PHONET_TYPE 0xab
68
69 static struct usb_interface_descriptor
70 pn_control_intf_desc = {
71 .bLength = sizeof pn_control_intf_desc,
72 .bDescriptorType = USB_DT_INTERFACE,
73
74 /* .bInterfaceNumber = DYNAMIC, */
75 .bInterfaceClass = USB_CLASS_COMM,
76 .bInterfaceSubClass = USB_CDC_SUBCLASS_PHONET,
77 };
78
79 static const struct usb_cdc_header_desc
80 pn_header_desc = {
81 .bLength = sizeof pn_header_desc,
82 .bDescriptorType = USB_DT_CS_INTERFACE,
83 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
84 .bcdCDC = cpu_to_le16(0x0110),
85 };
86
87 static const struct usb_cdc_header_desc
88 pn_phonet_desc = {
89 .bLength = sizeof pn_phonet_desc,
90 .bDescriptorType = USB_DT_CS_INTERFACE,
91 .bDescriptorSubType = USB_CDC_PHONET_TYPE,
92 .bcdCDC = cpu_to_le16(0x1505), /* ??? */
93 };
94
95 static struct usb_cdc_union_desc
96 pn_union_desc = {
97 .bLength = sizeof pn_union_desc,
98 .bDescriptorType = USB_DT_CS_INTERFACE,
99 .bDescriptorSubType = USB_CDC_UNION_TYPE,
100
101 /* .bMasterInterface0 = DYNAMIC, */
102 /* .bSlaveInterface0 = DYNAMIC, */
103 };
104
105 static struct usb_interface_descriptor
106 pn_data_nop_intf_desc = {
107 .bLength = sizeof pn_data_nop_intf_desc,
108 .bDescriptorType = USB_DT_INTERFACE,
109
110 /* .bInterfaceNumber = DYNAMIC, */
111 .bAlternateSetting = 0,
112 .bNumEndpoints = 0,
113 .bInterfaceClass = USB_CLASS_CDC_DATA,
114 };
115
116 static struct usb_interface_descriptor
117 pn_data_intf_desc = {
118 .bLength = sizeof pn_data_intf_desc,
119 .bDescriptorType = USB_DT_INTERFACE,
120
121 /* .bInterfaceNumber = DYNAMIC, */
122 .bAlternateSetting = 1,
123 .bNumEndpoints = 2,
124 .bInterfaceClass = USB_CLASS_CDC_DATA,
125 };
126
127 static struct usb_endpoint_descriptor
128 pn_fs_sink_desc = {
129 .bLength = USB_DT_ENDPOINT_SIZE,
130 .bDescriptorType = USB_DT_ENDPOINT,
131
132 .bEndpointAddress = USB_DIR_OUT,
133 .bmAttributes = USB_ENDPOINT_XFER_BULK,
134 };
135
136 static struct usb_endpoint_descriptor
137 pn_hs_sink_desc = {
138 .bLength = USB_DT_ENDPOINT_SIZE,
139 .bDescriptorType = USB_DT_ENDPOINT,
140
141 .bEndpointAddress = USB_DIR_OUT,
142 .bmAttributes = USB_ENDPOINT_XFER_BULK,
143 .wMaxPacketSize = cpu_to_le16(MAXPACKET),
144 };
145
146 static struct usb_endpoint_descriptor
147 pn_fs_source_desc = {
148 .bLength = USB_DT_ENDPOINT_SIZE,
149 .bDescriptorType = USB_DT_ENDPOINT,
150
151 .bEndpointAddress = USB_DIR_IN,
152 .bmAttributes = USB_ENDPOINT_XFER_BULK,
153 };
154
155 static struct usb_endpoint_descriptor
156 pn_hs_source_desc = {
157 .bLength = USB_DT_ENDPOINT_SIZE,
158 .bDescriptorType = USB_DT_ENDPOINT,
159
160 .bEndpointAddress = USB_DIR_IN,
161 .bmAttributes = USB_ENDPOINT_XFER_BULK,
162 .wMaxPacketSize = cpu_to_le16(512),
163 };
164
165 static struct usb_descriptor_header *fs_pn_function[] = {
166 (struct usb_descriptor_header *) &pn_control_intf_desc,
167 (struct usb_descriptor_header *) &pn_header_desc,
168 (struct usb_descriptor_header *) &pn_phonet_desc,
169 (struct usb_descriptor_header *) &pn_union_desc,
170 (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
171 (struct usb_descriptor_header *) &pn_data_intf_desc,
172 (struct usb_descriptor_header *) &pn_fs_sink_desc,
173 (struct usb_descriptor_header *) &pn_fs_source_desc,
174 NULL,
175 };
176
177 static struct usb_descriptor_header *hs_pn_function[] = {
178 (struct usb_descriptor_header *) &pn_control_intf_desc,
179 (struct usb_descriptor_header *) &pn_header_desc,
180 (struct usb_descriptor_header *) &pn_phonet_desc,
181 (struct usb_descriptor_header *) &pn_union_desc,
182 (struct usb_descriptor_header *) &pn_data_nop_intf_desc,
183 (struct usb_descriptor_header *) &pn_data_intf_desc,
184 (struct usb_descriptor_header *) &pn_hs_sink_desc,
185 (struct usb_descriptor_header *) &pn_hs_source_desc,
186 NULL,
187 };
188
189 /*-------------------------------------------------------------------------*/
190
pn_net_open(struct net_device * dev)191 static int pn_net_open(struct net_device *dev)
192 {
193 netif_wake_queue(dev);
194 return 0;
195 }
196
pn_net_close(struct net_device * dev)197 static int pn_net_close(struct net_device *dev)
198 {
199 netif_stop_queue(dev);
200 return 0;
201 }
202
pn_tx_complete(struct usb_ep * ep,struct usb_request * req)203 static void pn_tx_complete(struct usb_ep *ep, struct usb_request *req)
204 {
205 struct f_phonet *fp = ep->driver_data;
206 struct net_device *dev = fp->dev;
207 struct sk_buff *skb = req->context;
208
209 switch (req->status) {
210 case 0:
211 dev->stats.tx_packets++;
212 dev->stats.tx_bytes += skb->len;
213 break;
214
215 case -ESHUTDOWN: /* disconnected */
216 case -ECONNRESET: /* disabled */
217 dev->stats.tx_aborted_errors++;
218 default:
219 dev->stats.tx_errors++;
220 }
221
222 dev_kfree_skb_any(skb);
223 netif_wake_queue(dev);
224 }
225
pn_net_xmit(struct sk_buff * skb,struct net_device * dev)226 static int pn_net_xmit(struct sk_buff *skb, struct net_device *dev)
227 {
228 struct phonet_port *port = netdev_priv(dev);
229 struct f_phonet *fp;
230 struct usb_request *req;
231 unsigned long flags;
232
233 if (skb->protocol != htons(ETH_P_PHONET))
234 goto out;
235
236 spin_lock_irqsave(&port->lock, flags);
237 fp = port->usb;
238 if (unlikely(!fp)) /* race with carrier loss */
239 goto out_unlock;
240
241 req = fp->in_req;
242 req->buf = skb->data;
243 req->length = skb->len;
244 req->complete = pn_tx_complete;
245 req->zero = 1;
246 req->context = skb;
247
248 if (unlikely(usb_ep_queue(fp->in_ep, req, GFP_ATOMIC)))
249 goto out_unlock;
250
251 netif_stop_queue(dev);
252 skb = NULL;
253
254 out_unlock:
255 spin_unlock_irqrestore(&port->lock, flags);
256 out:
257 if (unlikely(skb)) {
258 dev_kfree_skb(skb);
259 dev->stats.tx_dropped++;
260 }
261 return NETDEV_TX_OK;
262 }
263
pn_net_mtu(struct net_device * dev,int new_mtu)264 static int pn_net_mtu(struct net_device *dev, int new_mtu)
265 {
266 if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
267 return -EINVAL;
268 dev->mtu = new_mtu;
269 return 0;
270 }
271
272 static const struct net_device_ops pn_netdev_ops = {
273 .ndo_open = pn_net_open,
274 .ndo_stop = pn_net_close,
275 .ndo_start_xmit = pn_net_xmit,
276 .ndo_change_mtu = pn_net_mtu,
277 };
278
pn_net_setup(struct net_device * dev)279 static void pn_net_setup(struct net_device *dev)
280 {
281 dev->features = 0;
282 dev->type = ARPHRD_PHONET;
283 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
284 dev->mtu = PHONET_DEV_MTU;
285 dev->hard_header_len = 1;
286 dev->dev_addr[0] = PN_MEDIA_USB;
287 dev->addr_len = 1;
288 dev->tx_queue_len = 1;
289
290 dev->netdev_ops = &pn_netdev_ops;
291 dev->destructor = free_netdev;
292 dev->header_ops = &phonet_header_ops;
293 }
294
295 /*-------------------------------------------------------------------------*/
296
297 /*
298 * Queue buffer for data from the host
299 */
300 static int
pn_rx_submit(struct f_phonet * fp,struct usb_request * req,gfp_t gfp_flags)301 pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
302 {
303 struct page *page;
304 int err;
305
306 page = __skb_alloc_page(gfp_flags | __GFP_NOMEMALLOC, NULL);
307 if (!page)
308 return -ENOMEM;
309
310 req->buf = page_address(page);
311 req->length = PAGE_SIZE;
312 req->context = page;
313
314 err = usb_ep_queue(fp->out_ep, req, gfp_flags);
315 if (unlikely(err))
316 put_page(page);
317 return err;
318 }
319
pn_rx_complete(struct usb_ep * ep,struct usb_request * req)320 static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
321 {
322 struct f_phonet *fp = ep->driver_data;
323 struct net_device *dev = fp->dev;
324 struct page *page = req->context;
325 struct sk_buff *skb;
326 unsigned long flags;
327 int status = req->status;
328
329 switch (status) {
330 case 0:
331 spin_lock_irqsave(&fp->rx.lock, flags);
332 skb = fp->rx.skb;
333 if (!skb)
334 skb = fp->rx.skb = netdev_alloc_skb(dev, 12);
335 if (req->actual < req->length) /* Last fragment */
336 fp->rx.skb = NULL;
337 spin_unlock_irqrestore(&fp->rx.lock, flags);
338
339 if (unlikely(!skb))
340 break;
341
342 if (skb->len == 0) { /* First fragment */
343 skb->protocol = htons(ETH_P_PHONET);
344 skb_reset_mac_header(skb);
345 /* Can't use pskb_pull() on page in IRQ */
346 memcpy(skb_put(skb, 1), page_address(page), 1);
347 }
348
349 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
350 skb->len <= 1, req->actual, PAGE_SIZE);
351 page = NULL;
352
353 if (req->actual < req->length) { /* Last fragment */
354 skb->dev = dev;
355 dev->stats.rx_packets++;
356 dev->stats.rx_bytes += skb->len;
357
358 netif_rx(skb);
359 }
360 break;
361
362 /* Do not resubmit in these cases: */
363 case -ESHUTDOWN: /* disconnect */
364 case -ECONNABORTED: /* hw reset */
365 case -ECONNRESET: /* dequeued (unlink or netif down) */
366 req = NULL;
367 break;
368
369 /* Do resubmit in these cases: */
370 case -EOVERFLOW: /* request buffer overflow */
371 dev->stats.rx_over_errors++;
372 default:
373 dev->stats.rx_errors++;
374 break;
375 }
376
377 if (page)
378 put_page(page);
379 if (req)
380 pn_rx_submit(fp, req, GFP_ATOMIC | __GFP_COLD);
381 }
382
383 /*-------------------------------------------------------------------------*/
384
__pn_reset(struct usb_function * f)385 static void __pn_reset(struct usb_function *f)
386 {
387 struct f_phonet *fp = func_to_pn(f);
388 struct net_device *dev = fp->dev;
389 struct phonet_port *port = netdev_priv(dev);
390
391 netif_carrier_off(dev);
392 port->usb = NULL;
393
394 usb_ep_disable(fp->out_ep);
395 usb_ep_disable(fp->in_ep);
396 if (fp->rx.skb) {
397 dev_kfree_skb_irq(fp->rx.skb);
398 fp->rx.skb = NULL;
399 }
400 }
401
pn_set_alt(struct usb_function * f,unsigned intf,unsigned alt)402 static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
403 {
404 struct f_phonet *fp = func_to_pn(f);
405 struct usb_gadget *gadget = fp->function.config->cdev->gadget;
406
407 if (intf == pn_control_intf_desc.bInterfaceNumber)
408 /* control interface, no altsetting */
409 return (alt > 0) ? -EINVAL : 0;
410
411 if (intf == pn_data_intf_desc.bInterfaceNumber) {
412 struct net_device *dev = fp->dev;
413 struct phonet_port *port = netdev_priv(dev);
414
415 /* data intf (0: inactive, 1: active) */
416 if (alt > 1)
417 return -EINVAL;
418
419 spin_lock(&port->lock);
420 __pn_reset(f);
421 if (alt == 1) {
422 int i;
423
424 if (config_ep_by_speed(gadget, f, fp->in_ep) ||
425 config_ep_by_speed(gadget, f, fp->out_ep)) {
426 fp->in_ep->desc = NULL;
427 fp->out_ep->desc = NULL;
428 spin_unlock(&port->lock);
429 return -EINVAL;
430 }
431 usb_ep_enable(fp->out_ep);
432 usb_ep_enable(fp->in_ep);
433
434 port->usb = fp;
435 fp->out_ep->driver_data = fp;
436 fp->in_ep->driver_data = fp;
437
438 netif_carrier_on(dev);
439 for (i = 0; i < phonet_rxq_size; i++)
440 pn_rx_submit(fp, fp->out_reqv[i], GFP_ATOMIC | __GFP_COLD);
441 }
442 spin_unlock(&port->lock);
443 return 0;
444 }
445
446 return -EINVAL;
447 }
448
pn_get_alt(struct usb_function * f,unsigned intf)449 static int pn_get_alt(struct usb_function *f, unsigned intf)
450 {
451 struct f_phonet *fp = func_to_pn(f);
452
453 if (intf == pn_control_intf_desc.bInterfaceNumber)
454 return 0;
455
456 if (intf == pn_data_intf_desc.bInterfaceNumber) {
457 struct phonet_port *port = netdev_priv(fp->dev);
458 u8 alt;
459
460 spin_lock(&port->lock);
461 alt = port->usb != NULL;
462 spin_unlock(&port->lock);
463 return alt;
464 }
465
466 return -EINVAL;
467 }
468
pn_disconnect(struct usb_function * f)469 static void pn_disconnect(struct usb_function *f)
470 {
471 struct f_phonet *fp = func_to_pn(f);
472 struct phonet_port *port = netdev_priv(fp->dev);
473 unsigned long flags;
474
475 /* remain disabled until set_alt */
476 spin_lock_irqsave(&port->lock, flags);
477 __pn_reset(f);
478 spin_unlock_irqrestore(&port->lock, flags);
479 }
480
481 /*-------------------------------------------------------------------------*/
482
pn_bind(struct usb_configuration * c,struct usb_function * f)483 static int pn_bind(struct usb_configuration *c, struct usb_function *f)
484 {
485 struct usb_composite_dev *cdev = c->cdev;
486 struct usb_gadget *gadget = cdev->gadget;
487 struct f_phonet *fp = func_to_pn(f);
488 struct usb_ep *ep;
489 int status, i;
490
491 struct f_phonet_opts *phonet_opts;
492
493 phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst);
494
495 /*
496 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
497 * configurations are bound in sequence with list_for_each_entry,
498 * in each configuration its functions are bound in sequence
499 * with list_for_each_entry, so we assume no race condition
500 * with regard to phonet_opts->bound access
501 */
502 if (!phonet_opts->bound) {
503 gphonet_set_gadget(phonet_opts->net, gadget);
504 status = gphonet_register_netdev(phonet_opts->net);
505 if (status)
506 return status;
507 phonet_opts->bound = true;
508 }
509
510 /* Reserve interface IDs */
511 status = usb_interface_id(c, f);
512 if (status < 0)
513 goto err;
514 pn_control_intf_desc.bInterfaceNumber = status;
515 pn_union_desc.bMasterInterface0 = status;
516
517 status = usb_interface_id(c, f);
518 if (status < 0)
519 goto err;
520 pn_data_nop_intf_desc.bInterfaceNumber = status;
521 pn_data_intf_desc.bInterfaceNumber = status;
522 pn_union_desc.bSlaveInterface0 = status;
523
524 /* Reserve endpoints */
525 status = -ENODEV;
526 ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc);
527 if (!ep)
528 goto err;
529 fp->out_ep = ep;
530 ep->driver_data = fp; /* Claim */
531
532 ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
533 if (!ep)
534 goto err;
535 fp->in_ep = ep;
536 ep->driver_data = fp; /* Claim */
537
538 pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
539 pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
540
541 /* Do not try to bind Phonet twice... */
542 status = usb_assign_descriptors(f, fs_pn_function, hs_pn_function,
543 NULL);
544 if (status)
545 goto err;
546
547 /* Incoming USB requests */
548 status = -ENOMEM;
549 for (i = 0; i < phonet_rxq_size; i++) {
550 struct usb_request *req;
551
552 req = usb_ep_alloc_request(fp->out_ep, GFP_KERNEL);
553 if (!req)
554 goto err_req;
555
556 req->complete = pn_rx_complete;
557 fp->out_reqv[i] = req;
558 }
559
560 /* Outgoing USB requests */
561 fp->in_req = usb_ep_alloc_request(fp->in_ep, GFP_KERNEL);
562 if (!fp->in_req)
563 goto err_req;
564
565 INFO(cdev, "USB CDC Phonet function\n");
566 INFO(cdev, "using %s, OUT %s, IN %s\n", cdev->gadget->name,
567 fp->out_ep->name, fp->in_ep->name);
568 return 0;
569
570 err_req:
571 for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++)
572 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
573 usb_free_all_descriptors(f);
574 err:
575 if (fp->out_ep)
576 fp->out_ep->driver_data = NULL;
577 if (fp->in_ep)
578 fp->in_ep->driver_data = NULL;
579 ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
580 return status;
581 }
582
to_f_phonet_opts(struct config_item * item)583 static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item)
584 {
585 return container_of(to_config_group(item), struct f_phonet_opts,
586 func_inst.group);
587 }
588
589 CONFIGFS_ATTR_STRUCT(f_phonet_opts);
f_phonet_attr_show(struct config_item * item,struct configfs_attribute * attr,char * page)590 static ssize_t f_phonet_attr_show(struct config_item *item,
591 struct configfs_attribute *attr,
592 char *page)
593 {
594 struct f_phonet_opts *opts = to_f_phonet_opts(item);
595 struct f_phonet_opts_attribute *f_phonet_opts_attr =
596 container_of(attr, struct f_phonet_opts_attribute, attr);
597 ssize_t ret = 0;
598
599 if (f_phonet_opts_attr->show)
600 ret = f_phonet_opts_attr->show(opts, page);
601 return ret;
602 }
603
phonet_attr_release(struct config_item * item)604 static void phonet_attr_release(struct config_item *item)
605 {
606 struct f_phonet_opts *opts = to_f_phonet_opts(item);
607
608 usb_put_function_instance(&opts->func_inst);
609 }
610
611 static struct configfs_item_operations phonet_item_ops = {
612 .release = phonet_attr_release,
613 .show_attribute = f_phonet_attr_show,
614 };
615
f_phonet_ifname_show(struct f_phonet_opts * opts,char * page)616 static ssize_t f_phonet_ifname_show(struct f_phonet_opts *opts, char *page)
617 {
618 return gether_get_ifname(opts->net, page, PAGE_SIZE);
619 }
620
621 static struct f_phonet_opts_attribute f_phonet_ifname =
622 __CONFIGFS_ATTR_RO(ifname, f_phonet_ifname_show);
623
624 static struct configfs_attribute *phonet_attrs[] = {
625 &f_phonet_ifname.attr,
626 NULL,
627 };
628
629 static struct config_item_type phonet_func_type = {
630 .ct_item_ops = &phonet_item_ops,
631 .ct_attrs = phonet_attrs,
632 .ct_owner = THIS_MODULE,
633 };
634
phonet_free_inst(struct usb_function_instance * f)635 static void phonet_free_inst(struct usb_function_instance *f)
636 {
637 struct f_phonet_opts *opts;
638
639 opts = container_of(f, struct f_phonet_opts, func_inst);
640 if (opts->bound)
641 gphonet_cleanup(opts->net);
642 else
643 free_netdev(opts->net);
644 kfree(opts);
645 }
646
phonet_alloc_inst(void)647 static struct usb_function_instance *phonet_alloc_inst(void)
648 {
649 struct f_phonet_opts *opts;
650
651 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
652 if (!opts)
653 return ERR_PTR(-ENOMEM);
654
655 opts->func_inst.free_func_inst = phonet_free_inst;
656 opts->net = gphonet_setup_default();
657 if (IS_ERR(opts->net)) {
658 struct net_device *net = opts->net;
659 kfree(opts);
660 return ERR_CAST(net);
661 }
662
663 config_group_init_type_name(&opts->func_inst.group, "",
664 &phonet_func_type);
665
666 return &opts->func_inst;
667 }
668
phonet_free(struct usb_function * f)669 static void phonet_free(struct usb_function *f)
670 {
671 struct f_phonet *phonet;
672
673 phonet = func_to_pn(f);
674 kfree(phonet);
675 }
676
pn_unbind(struct usb_configuration * c,struct usb_function * f)677 static void pn_unbind(struct usb_configuration *c, struct usb_function *f)
678 {
679 struct f_phonet *fp = func_to_pn(f);
680 int i;
681
682 /* We are already disconnected */
683 if (fp->in_req)
684 usb_ep_free_request(fp->in_ep, fp->in_req);
685 for (i = 0; i < phonet_rxq_size; i++)
686 if (fp->out_reqv[i])
687 usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
688
689 usb_free_all_descriptors(f);
690 }
691
phonet_alloc(struct usb_function_instance * fi)692 static struct usb_function *phonet_alloc(struct usb_function_instance *fi)
693 {
694 struct f_phonet *fp;
695 struct f_phonet_opts *opts;
696 int size;
697
698 size = sizeof(*fp) + (phonet_rxq_size * sizeof(struct usb_request *));
699 fp = kzalloc(size, GFP_KERNEL);
700 if (!fp)
701 return ERR_PTR(-ENOMEM);
702
703 opts = container_of(fi, struct f_phonet_opts, func_inst);
704
705 fp->dev = opts->net;
706 fp->function.name = "phonet";
707 fp->function.bind = pn_bind;
708 fp->function.unbind = pn_unbind;
709 fp->function.set_alt = pn_set_alt;
710 fp->function.get_alt = pn_get_alt;
711 fp->function.disable = pn_disconnect;
712 fp->function.free_func = phonet_free;
713 spin_lock_init(&fp->rx.lock);
714
715 return &fp->function;
716 }
717
gphonet_setup_default(void)718 struct net_device *gphonet_setup_default(void)
719 {
720 struct net_device *dev;
721 struct phonet_port *port;
722
723 /* Create net device */
724 dev = alloc_netdev(sizeof(*port), "upnlink%d", NET_NAME_UNKNOWN,
725 pn_net_setup);
726 if (!dev)
727 return ERR_PTR(-ENOMEM);
728
729 port = netdev_priv(dev);
730 spin_lock_init(&port->lock);
731 netif_carrier_off(dev);
732
733 return dev;
734 }
735
gphonet_set_gadget(struct net_device * net,struct usb_gadget * g)736 void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g)
737 {
738 SET_NETDEV_DEV(net, &g->dev);
739 }
740
gphonet_register_netdev(struct net_device * net)741 int gphonet_register_netdev(struct net_device *net)
742 {
743 int status;
744
745 status = register_netdev(net);
746 if (status)
747 free_netdev(net);
748
749 return status;
750 }
751
gphonet_cleanup(struct net_device * dev)752 void gphonet_cleanup(struct net_device *dev)
753 {
754 unregister_netdev(dev);
755 }
756
757 DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc);
758 MODULE_AUTHOR("Rémi Denis-Courmont");
759 MODULE_LICENSE("GPL");
760