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 | |
36 | struct phonet_port { |
37 | struct f_phonet *usb; |
38 | spinlock_t lock; |
39 | }; |
40 | |
41 | struct 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 | |
54 | static int phonet_rxq_size = 17; |
55 | |
56 | static 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 | |
66 | static struct usb_interface_descriptor |
67 | pn_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 | |
76 | static const struct usb_cdc_header_desc |
77 | = { |
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 | |
84 | static const struct usb_cdc_header_desc |
85 | pn_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 | |
92 | static struct usb_cdc_union_desc |
93 | pn_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 | |
102 | static struct usb_interface_descriptor |
103 | pn_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 | |
113 | static struct usb_interface_descriptor |
114 | pn_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 | |
124 | static struct usb_endpoint_descriptor |
125 | pn_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 | |
133 | static struct usb_endpoint_descriptor |
134 | pn_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 | |
143 | static struct usb_endpoint_descriptor |
144 | pn_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 | |
152 | static struct usb_endpoint_descriptor |
153 | pn_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 | |
162 | static 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 | |
174 | static 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 | |
188 | static int pn_net_open(struct net_device *dev) |
189 | { |
190 | netif_wake_queue(dev); |
191 | return 0; |
192 | } |
193 | |
194 | static int pn_net_close(struct net_device *dev) |
195 | { |
196 | netif_stop_queue(dev); |
197 | return 0; |
198 | } |
199 | |
200 | static 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 | |
224 | static 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 | |
252 | out_unlock: |
253 | spin_unlock_irqrestore(lock: &port->lock, flags); |
254 | out: |
255 | if (unlikely(skb)) { |
256 | dev_kfree_skb(skb); |
257 | dev->stats.tx_dropped++; |
258 | } |
259 | return NETDEV_TX_OK; |
260 | } |
261 | |
262 | static 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 | |
268 | static 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: &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 | */ |
294 | static int |
295 | pn_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_mask: 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(ep: fp->out_ep, req, gfp_flags); |
309 | if (unlikely(err)) |
310 | put_page(page); |
311 | return err; |
312 | } |
313 | |
314 | static 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, length: 12); |
329 | if (req->actual < req->length) /* Last fragment */ |
330 | fp->rx.skb = NULL; |
331 | spin_unlock_irqrestore(lock: &fp->rx.lock, flags); |
332 | |
333 | if (unlikely(!skb)) |
334 | break; |
335 | |
336 | if (skb->len == 0) { /* First fragment */ |
337 | skb->protocol = htons(ETH_P_PHONET); |
338 | skb_reset_mac_header(skb); |
339 | /* Can't use pskb_pull() on page in IRQ */ |
340 | skb_put_data(skb, page_address(page), len: 1); |
341 | } |
342 | |
343 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, |
344 | off: skb->len <= 1, size: req->actual, PAGE_SIZE); |
345 | page = NULL; |
346 | |
347 | if (req->actual < req->length) { /* Last fragment */ |
348 | skb->dev = dev; |
349 | dev->stats.rx_packets++; |
350 | dev->stats.rx_bytes += skb->len; |
351 | |
352 | netif_rx(skb); |
353 | } |
354 | break; |
355 | |
356 | /* Do not resubmit in these cases: */ |
357 | case -ESHUTDOWN: /* disconnect */ |
358 | case -ECONNABORTED: /* hw reset */ |
359 | case -ECONNRESET: /* dequeued (unlink or netif down) */ |
360 | req = NULL; |
361 | break; |
362 | |
363 | /* Do resubmit in these cases: */ |
364 | case -EOVERFLOW: /* request buffer overflow */ |
365 | dev->stats.rx_over_errors++; |
366 | fallthrough; |
367 | default: |
368 | dev->stats.rx_errors++; |
369 | break; |
370 | } |
371 | |
372 | if (page) |
373 | put_page(page); |
374 | if (req) |
375 | pn_rx_submit(fp, req, GFP_ATOMIC); |
376 | } |
377 | |
378 | /*-------------------------------------------------------------------------*/ |
379 | |
380 | static void __pn_reset(struct usb_function *f) |
381 | { |
382 | struct f_phonet *fp = func_to_pn(f); |
383 | struct net_device *dev = fp->dev; |
384 | struct phonet_port *port = netdev_priv(dev); |
385 | |
386 | netif_carrier_off(dev); |
387 | port->usb = NULL; |
388 | |
389 | usb_ep_disable(ep: fp->out_ep); |
390 | usb_ep_disable(ep: fp->in_ep); |
391 | if (fp->rx.skb) { |
392 | dev_kfree_skb_irq(skb: fp->rx.skb); |
393 | fp->rx.skb = NULL; |
394 | } |
395 | } |
396 | |
397 | static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
398 | { |
399 | struct f_phonet *fp = func_to_pn(f); |
400 | struct usb_gadget *gadget = fp->function.config->cdev->gadget; |
401 | |
402 | if (intf == pn_control_intf_desc.bInterfaceNumber) |
403 | /* control interface, no altsetting */ |
404 | return (alt > 0) ? -EINVAL : 0; |
405 | |
406 | if (intf == pn_data_intf_desc.bInterfaceNumber) { |
407 | struct net_device *dev = fp->dev; |
408 | struct phonet_port *port = netdev_priv(dev); |
409 | |
410 | /* data intf (0: inactive, 1: active) */ |
411 | if (alt > 1) |
412 | return -EINVAL; |
413 | |
414 | spin_lock(lock: &port->lock); |
415 | |
416 | if (fp->in_ep->enabled) |
417 | __pn_reset(f); |
418 | |
419 | if (alt == 1) { |
420 | int i; |
421 | |
422 | if (config_ep_by_speed(g: gadget, f, ep: fp->in_ep) || |
423 | config_ep_by_speed(g: gadget, f, ep: fp->out_ep)) { |
424 | fp->in_ep->desc = NULL; |
425 | fp->out_ep->desc = NULL; |
426 | spin_unlock(lock: &port->lock); |
427 | return -EINVAL; |
428 | } |
429 | usb_ep_enable(ep: fp->out_ep); |
430 | usb_ep_enable(ep: fp->in_ep); |
431 | |
432 | port->usb = fp; |
433 | fp->out_ep->driver_data = fp; |
434 | fp->in_ep->driver_data = fp; |
435 | |
436 | netif_carrier_on(dev); |
437 | for (i = 0; i < phonet_rxq_size; i++) |
438 | pn_rx_submit(fp, req: fp->out_reqv[i], GFP_ATOMIC); |
439 | } |
440 | spin_unlock(lock: &port->lock); |
441 | return 0; |
442 | } |
443 | |
444 | return -EINVAL; |
445 | } |
446 | |
447 | static int pn_get_alt(struct usb_function *f, unsigned intf) |
448 | { |
449 | struct f_phonet *fp = func_to_pn(f); |
450 | |
451 | if (intf == pn_control_intf_desc.bInterfaceNumber) |
452 | return 0; |
453 | |
454 | if (intf == pn_data_intf_desc.bInterfaceNumber) { |
455 | struct phonet_port *port = netdev_priv(dev: fp->dev); |
456 | u8 alt; |
457 | |
458 | spin_lock(lock: &port->lock); |
459 | alt = port->usb != NULL; |
460 | spin_unlock(lock: &port->lock); |
461 | return alt; |
462 | } |
463 | |
464 | return -EINVAL; |
465 | } |
466 | |
467 | static void pn_disconnect(struct usb_function *f) |
468 | { |
469 | struct f_phonet *fp = func_to_pn(f); |
470 | struct phonet_port *port = netdev_priv(dev: fp->dev); |
471 | unsigned long flags; |
472 | |
473 | /* remain disabled until set_alt */ |
474 | spin_lock_irqsave(&port->lock, flags); |
475 | __pn_reset(f); |
476 | spin_unlock_irqrestore(lock: &port->lock, flags); |
477 | } |
478 | |
479 | /*-------------------------------------------------------------------------*/ |
480 | |
481 | static int pn_bind(struct usb_configuration *c, struct usb_function *f) |
482 | { |
483 | struct usb_composite_dev *cdev = c->cdev; |
484 | struct usb_gadget *gadget = cdev->gadget; |
485 | struct f_phonet *fp = func_to_pn(f); |
486 | struct usb_ep *ep; |
487 | int status, i; |
488 | |
489 | struct f_phonet_opts *phonet_opts; |
490 | |
491 | phonet_opts = container_of(f->fi, struct f_phonet_opts, func_inst); |
492 | |
493 | /* |
494 | * in drivers/usb/gadget/configfs.c:configfs_composite_bind() |
495 | * configurations are bound in sequence with list_for_each_entry, |
496 | * in each configuration its functions are bound in sequence |
497 | * with list_for_each_entry, so we assume no race condition |
498 | * with regard to phonet_opts->bound access |
499 | */ |
500 | if (!phonet_opts->bound) { |
501 | gphonet_set_gadget(net: phonet_opts->net, g: gadget); |
502 | status = gphonet_register_netdev(net: phonet_opts->net); |
503 | if (status) |
504 | return status; |
505 | phonet_opts->bound = true; |
506 | } |
507 | |
508 | /* Reserve interface IDs */ |
509 | status = usb_interface_id(c, f); |
510 | if (status < 0) |
511 | goto err; |
512 | pn_control_intf_desc.bInterfaceNumber = status; |
513 | pn_union_desc.bMasterInterface0 = status; |
514 | |
515 | status = usb_interface_id(c, f); |
516 | if (status < 0) |
517 | goto err; |
518 | pn_data_nop_intf_desc.bInterfaceNumber = status; |
519 | pn_data_intf_desc.bInterfaceNumber = status; |
520 | pn_union_desc.bSlaveInterface0 = status; |
521 | |
522 | /* Reserve endpoints */ |
523 | status = -ENODEV; |
524 | ep = usb_ep_autoconfig(gadget, &pn_fs_sink_desc); |
525 | if (!ep) |
526 | goto err; |
527 | fp->out_ep = ep; |
528 | |
529 | ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc); |
530 | if (!ep) |
531 | goto err; |
532 | fp->in_ep = ep; |
533 | |
534 | pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress; |
535 | pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress; |
536 | |
537 | /* Do not try to bind Phonet twice... */ |
538 | status = usb_assign_descriptors(f, fs: fs_pn_function, hs: hs_pn_function, |
539 | NULL, NULL); |
540 | if (status) |
541 | goto err; |
542 | |
543 | /* Incoming USB requests */ |
544 | status = -ENOMEM; |
545 | for (i = 0; i < phonet_rxq_size; i++) { |
546 | struct usb_request *req; |
547 | |
548 | req = usb_ep_alloc_request(ep: fp->out_ep, GFP_KERNEL); |
549 | if (!req) |
550 | goto err_req; |
551 | |
552 | req->complete = pn_rx_complete; |
553 | fp->out_reqv[i] = req; |
554 | } |
555 | |
556 | /* Outgoing USB requests */ |
557 | fp->in_req = usb_ep_alloc_request(ep: fp->in_ep, GFP_KERNEL); |
558 | if (!fp->in_req) |
559 | goto err_req; |
560 | |
561 | INFO(cdev, "USB CDC Phonet function\n" ); |
562 | INFO(cdev, "using %s, OUT %s, IN %s\n" , cdev->gadget->name, |
563 | fp->out_ep->name, fp->in_ep->name); |
564 | return 0; |
565 | |
566 | err_req: |
567 | for (i = 0; i < phonet_rxq_size && fp->out_reqv[i]; i++) |
568 | usb_ep_free_request(ep: fp->out_ep, req: fp->out_reqv[i]); |
569 | usb_free_all_descriptors(f); |
570 | err: |
571 | ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n" ); |
572 | return status; |
573 | } |
574 | |
575 | static inline struct f_phonet_opts *to_f_phonet_opts(struct config_item *item) |
576 | { |
577 | return container_of(to_config_group(item), struct f_phonet_opts, |
578 | func_inst.group); |
579 | } |
580 | |
581 | static void phonet_attr_release(struct config_item *item) |
582 | { |
583 | struct f_phonet_opts *opts = to_f_phonet_opts(item); |
584 | |
585 | usb_put_function_instance(fi: &opts->func_inst); |
586 | } |
587 | |
588 | static struct configfs_item_operations phonet_item_ops = { |
589 | .release = phonet_attr_release, |
590 | }; |
591 | |
592 | static ssize_t f_phonet_ifname_show(struct config_item *item, char *page) |
593 | { |
594 | return gether_get_ifname(net: to_f_phonet_opts(item)->net, name: page, PAGE_SIZE); |
595 | } |
596 | |
597 | CONFIGFS_ATTR_RO(f_phonet_, ifname); |
598 | |
599 | static struct configfs_attribute *phonet_attrs[] = { |
600 | &f_phonet_attr_ifname, |
601 | NULL, |
602 | }; |
603 | |
604 | static const struct config_item_type phonet_func_type = { |
605 | .ct_item_ops = &phonet_item_ops, |
606 | .ct_attrs = phonet_attrs, |
607 | .ct_owner = THIS_MODULE, |
608 | }; |
609 | |
610 | static void phonet_free_inst(struct usb_function_instance *f) |
611 | { |
612 | struct f_phonet_opts *opts; |
613 | |
614 | opts = container_of(f, struct f_phonet_opts, func_inst); |
615 | if (opts->bound) |
616 | gphonet_cleanup(dev: opts->net); |
617 | else |
618 | free_netdev(dev: opts->net); |
619 | kfree(objp: opts); |
620 | } |
621 | |
622 | static struct usb_function_instance *phonet_alloc_inst(void) |
623 | { |
624 | struct f_phonet_opts *opts; |
625 | |
626 | opts = kzalloc(size: sizeof(*opts), GFP_KERNEL); |
627 | if (!opts) |
628 | return ERR_PTR(error: -ENOMEM); |
629 | |
630 | opts->func_inst.free_func_inst = phonet_free_inst; |
631 | opts->net = gphonet_setup_default(); |
632 | if (IS_ERR(ptr: opts->net)) { |
633 | struct net_device *net = opts->net; |
634 | kfree(objp: opts); |
635 | return ERR_CAST(ptr: net); |
636 | } |
637 | |
638 | config_group_init_type_name(group: &opts->func_inst.group, name: "" , |
639 | type: &phonet_func_type); |
640 | |
641 | return &opts->func_inst; |
642 | } |
643 | |
644 | static void phonet_free(struct usb_function *f) |
645 | { |
646 | struct f_phonet *phonet; |
647 | |
648 | phonet = func_to_pn(f); |
649 | kfree(objp: phonet); |
650 | } |
651 | |
652 | static void pn_unbind(struct usb_configuration *c, struct usb_function *f) |
653 | { |
654 | struct f_phonet *fp = func_to_pn(f); |
655 | int i; |
656 | |
657 | /* We are already disconnected */ |
658 | if (fp->in_req) |
659 | usb_ep_free_request(ep: fp->in_ep, req: fp->in_req); |
660 | for (i = 0; i < phonet_rxq_size; i++) |
661 | if (fp->out_reqv[i]) |
662 | usb_ep_free_request(ep: fp->out_ep, req: fp->out_reqv[i]); |
663 | |
664 | usb_free_all_descriptors(f); |
665 | } |
666 | |
667 | static struct usb_function *phonet_alloc(struct usb_function_instance *fi) |
668 | { |
669 | struct f_phonet *fp; |
670 | struct f_phonet_opts *opts; |
671 | |
672 | fp = kzalloc(struct_size(fp, out_reqv, phonet_rxq_size), GFP_KERNEL); |
673 | if (!fp) |
674 | return ERR_PTR(error: -ENOMEM); |
675 | |
676 | opts = container_of(fi, struct f_phonet_opts, func_inst); |
677 | |
678 | fp->dev = opts->net; |
679 | fp->function.name = "phonet" ; |
680 | fp->function.bind = pn_bind; |
681 | fp->function.unbind = pn_unbind; |
682 | fp->function.set_alt = pn_set_alt; |
683 | fp->function.get_alt = pn_get_alt; |
684 | fp->function.disable = pn_disconnect; |
685 | fp->function.free_func = phonet_free; |
686 | spin_lock_init(&fp->rx.lock); |
687 | |
688 | return &fp->function; |
689 | } |
690 | |
691 | struct net_device *gphonet_setup_default(void) |
692 | { |
693 | struct net_device *dev; |
694 | struct phonet_port *port; |
695 | |
696 | /* Create net device */ |
697 | dev = alloc_netdev(sizeof(*port), "upnlink%d" , NET_NAME_UNKNOWN, |
698 | pn_net_setup); |
699 | if (!dev) |
700 | return ERR_PTR(error: -ENOMEM); |
701 | |
702 | port = netdev_priv(dev); |
703 | spin_lock_init(&port->lock); |
704 | netif_carrier_off(dev); |
705 | |
706 | return dev; |
707 | } |
708 | |
709 | void gphonet_set_gadget(struct net_device *net, struct usb_gadget *g) |
710 | { |
711 | SET_NETDEV_DEV(net, &g->dev); |
712 | } |
713 | |
714 | int gphonet_register_netdev(struct net_device *net) |
715 | { |
716 | int status; |
717 | |
718 | status = register_netdev(dev: net); |
719 | if (status) |
720 | free_netdev(dev: net); |
721 | |
722 | return status; |
723 | } |
724 | |
725 | void gphonet_cleanup(struct net_device *dev) |
726 | { |
727 | unregister_netdev(dev); |
728 | } |
729 | |
730 | DECLARE_USB_FUNCTION_INIT(phonet, phonet_alloc_inst, phonet_alloc); |
731 | MODULE_AUTHOR("Rémi Denis-Courmont" ); |
732 | MODULE_LICENSE("GPL" ); |
733 | |