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87cf6560 RDC |
1 | /* |
2 | * phonet.c -- USB CDC Phonet host driver | |
3 | * | |
4 | * Copyright (C) 2008-2009 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 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
87cf6560 RDC |
26 | #include <linux/usb.h> |
27 | #include <linux/usb/cdc.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/if_phonet.h> | |
02571f89 | 31 | #include <linux/phonet.h> |
87cf6560 RDC |
32 | |
33 | #define PN_MEDIA_USB 0x1B | |
34 | ||
35 | static const unsigned rxq_size = 17; | |
36 | ||
37 | struct usbpn_dev { | |
38 | struct net_device *dev; | |
39 | ||
40 | struct usb_interface *intf, *data_intf; | |
41 | struct usb_device *usb; | |
42 | unsigned int tx_pipe, rx_pipe; | |
43 | u8 active_setting; | |
44 | u8 disconnected; | |
45 | ||
46 | unsigned tx_queue; | |
47 | spinlock_t tx_lock; | |
48 | ||
49 | spinlock_t rx_lock; | |
50 | struct sk_buff *rx_skb; | |
51 | struct urb *urbs[0]; | |
52 | }; | |
53 | ||
54 | static void tx_complete(struct urb *req); | |
55 | static void rx_complete(struct urb *req); | |
56 | ||
57 | /* | |
58 | * Network device callbacks | |
59 | */ | |
25a79c41 | 60 | static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev) |
87cf6560 RDC |
61 | { |
62 | struct usbpn_dev *pnd = netdev_priv(dev); | |
63 | struct urb *req = NULL; | |
64 | unsigned long flags; | |
65 | int err; | |
66 | ||
67 | if (skb->protocol != htons(ETH_P_PHONET)) | |
68 | goto drop; | |
69 | ||
70 | req = usb_alloc_urb(0, GFP_ATOMIC); | |
71 | if (!req) | |
72 | goto drop; | |
73 | usb_fill_bulk_urb(req, pnd->usb, pnd->tx_pipe, skb->data, skb->len, | |
74 | tx_complete, skb); | |
75 | req->transfer_flags = URB_ZERO_PACKET; | |
76 | err = usb_submit_urb(req, GFP_ATOMIC); | |
77 | if (err) { | |
78 | usb_free_urb(req); | |
79 | goto drop; | |
80 | } | |
81 | ||
82 | spin_lock_irqsave(&pnd->tx_lock, flags); | |
83 | pnd->tx_queue++; | |
84 | if (pnd->tx_queue >= dev->tx_queue_len) | |
85 | netif_stop_queue(dev); | |
86 | spin_unlock_irqrestore(&pnd->tx_lock, flags); | |
25a79c41 | 87 | return NETDEV_TX_OK; |
87cf6560 RDC |
88 | |
89 | drop: | |
90 | dev_kfree_skb(skb); | |
91 | dev->stats.tx_dropped++; | |
25a79c41 | 92 | return NETDEV_TX_OK; |
87cf6560 RDC |
93 | } |
94 | ||
95 | static void tx_complete(struct urb *req) | |
96 | { | |
97 | struct sk_buff *skb = req->context; | |
98 | struct net_device *dev = skb->dev; | |
99 | struct usbpn_dev *pnd = netdev_priv(dev); | |
100 | ||
101 | switch (req->status) { | |
102 | case 0: | |
103 | dev->stats.tx_bytes += skb->len; | |
104 | break; | |
105 | ||
106 | case -ENOENT: | |
107 | case -ECONNRESET: | |
108 | case -ESHUTDOWN: | |
109 | dev->stats.tx_aborted_errors++; | |
110 | default: | |
111 | dev->stats.tx_errors++; | |
112 | dev_dbg(&dev->dev, "TX error (%d)\n", req->status); | |
113 | } | |
114 | dev->stats.tx_packets++; | |
115 | ||
116 | spin_lock(&pnd->tx_lock); | |
117 | pnd->tx_queue--; | |
118 | netif_wake_queue(dev); | |
119 | spin_unlock(&pnd->tx_lock); | |
120 | ||
121 | dev_kfree_skb_any(skb); | |
122 | usb_free_urb(req); | |
123 | } | |
124 | ||
125 | static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags) | |
126 | { | |
127 | struct net_device *dev = pnd->dev; | |
128 | struct page *page; | |
129 | int err; | |
130 | ||
131 | page = __netdev_alloc_page(dev, gfp_flags); | |
132 | if (!page) | |
133 | return -ENOMEM; | |
134 | ||
135 | usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page), | |
136 | PAGE_SIZE, rx_complete, dev); | |
137 | req->transfer_flags = 0; | |
138 | err = usb_submit_urb(req, gfp_flags); | |
139 | if (unlikely(err)) { | |
140 | dev_dbg(&dev->dev, "RX submit error (%d)\n", err); | |
141 | netdev_free_page(dev, page); | |
142 | } | |
143 | return err; | |
144 | } | |
145 | ||
146 | static void rx_complete(struct urb *req) | |
147 | { | |
148 | struct net_device *dev = req->context; | |
149 | struct usbpn_dev *pnd = netdev_priv(dev); | |
150 | struct page *page = virt_to_page(req->transfer_buffer); | |
151 | struct sk_buff *skb; | |
152 | unsigned long flags; | |
153 | ||
154 | switch (req->status) { | |
155 | case 0: | |
156 | spin_lock_irqsave(&pnd->rx_lock, flags); | |
157 | skb = pnd->rx_skb; | |
158 | if (!skb) { | |
159 | skb = pnd->rx_skb = netdev_alloc_skb(dev, 12); | |
160 | if (likely(skb)) { | |
161 | /* Can't use pskb_pull() on page in IRQ */ | |
162 | memcpy(skb_put(skb, 1), page_address(page), 1); | |
163 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, | |
164 | page, 1, req->actual_length); | |
165 | page = NULL; | |
166 | } | |
167 | } else { | |
168 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, | |
169 | page, 0, req->actual_length); | |
170 | page = NULL; | |
171 | } | |
172 | if (req->actual_length < PAGE_SIZE) | |
173 | pnd->rx_skb = NULL; /* Last fragment */ | |
174 | else | |
175 | skb = NULL; | |
176 | spin_unlock_irqrestore(&pnd->rx_lock, flags); | |
177 | if (skb) { | |
178 | skb->protocol = htons(ETH_P_PHONET); | |
179 | skb_reset_mac_header(skb); | |
180 | __skb_pull(skb, 1); | |
181 | skb->dev = dev; | |
182 | dev->stats.rx_packets++; | |
183 | dev->stats.rx_bytes += skb->len; | |
184 | ||
185 | netif_rx(skb); | |
186 | } | |
187 | goto resubmit; | |
188 | ||
189 | case -ENOENT: | |
190 | case -ECONNRESET: | |
191 | case -ESHUTDOWN: | |
192 | req = NULL; | |
193 | break; | |
194 | ||
195 | case -EOVERFLOW: | |
196 | dev->stats.rx_over_errors++; | |
197 | dev_dbg(&dev->dev, "RX overflow\n"); | |
198 | break; | |
199 | ||
200 | case -EILSEQ: | |
201 | dev->stats.rx_crc_errors++; | |
202 | break; | |
203 | } | |
204 | ||
205 | dev->stats.rx_errors++; | |
206 | resubmit: | |
207 | if (page) | |
208 | netdev_free_page(dev, page); | |
209 | if (req) | |
210 | rx_submit(pnd, req, GFP_ATOMIC); | |
211 | } | |
212 | ||
213 | static int usbpn_close(struct net_device *dev); | |
214 | ||
215 | static int usbpn_open(struct net_device *dev) | |
216 | { | |
217 | struct usbpn_dev *pnd = netdev_priv(dev); | |
218 | int err; | |
219 | unsigned i; | |
220 | unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber; | |
221 | ||
222 | err = usb_set_interface(pnd->usb, num, pnd->active_setting); | |
223 | if (err) | |
224 | return err; | |
225 | ||
226 | for (i = 0; i < rxq_size; i++) { | |
227 | struct urb *req = usb_alloc_urb(0, GFP_KERNEL); | |
228 | ||
229 | if (!req || rx_submit(pnd, req, GFP_KERNEL)) { | |
230 | usbpn_close(dev); | |
231 | return -ENOMEM; | |
232 | } | |
233 | pnd->urbs[i] = req; | |
234 | } | |
235 | ||
236 | netif_wake_queue(dev); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | static int usbpn_close(struct net_device *dev) | |
241 | { | |
242 | struct usbpn_dev *pnd = netdev_priv(dev); | |
243 | unsigned i; | |
244 | unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber; | |
245 | ||
246 | netif_stop_queue(dev); | |
247 | ||
248 | for (i = 0; i < rxq_size; i++) { | |
249 | struct urb *req = pnd->urbs[i]; | |
250 | ||
251 | if (!req) | |
252 | continue; | |
253 | usb_kill_urb(req); | |
254 | usb_free_urb(req); | |
255 | pnd->urbs[i] = NULL; | |
256 | } | |
257 | ||
258 | return usb_set_interface(pnd->usb, num, !pnd->active_setting); | |
259 | } | |
260 | ||
02571f89 RDC |
261 | static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) |
262 | { | |
263 | struct if_phonet_req *req = (struct if_phonet_req *)ifr; | |
264 | ||
265 | switch (cmd) { | |
266 | case SIOCPNGAUTOCONF: | |
267 | req->ifr_phonet_autoconf.device = PN_DEV_PC; | |
02571f89 RDC |
268 | return 0; |
269 | } | |
270 | return -ENOIOCTLCMD; | |
271 | } | |
272 | ||
87cf6560 RDC |
273 | static int usbpn_set_mtu(struct net_device *dev, int new_mtu) |
274 | { | |
275 | if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU)) | |
276 | return -EINVAL; | |
277 | ||
278 | dev->mtu = new_mtu; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static const struct net_device_ops usbpn_ops = { | |
283 | .ndo_open = usbpn_open, | |
284 | .ndo_stop = usbpn_close, | |
285 | .ndo_start_xmit = usbpn_xmit, | |
02571f89 | 286 | .ndo_do_ioctl = usbpn_ioctl, |
87cf6560 RDC |
287 | .ndo_change_mtu = usbpn_set_mtu, |
288 | }; | |
289 | ||
290 | static void usbpn_setup(struct net_device *dev) | |
291 | { | |
292 | dev->features = 0; | |
293 | dev->netdev_ops = &usbpn_ops, | |
294 | dev->header_ops = &phonet_header_ops; | |
295 | dev->type = ARPHRD_PHONET; | |
296 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
297 | dev->mtu = PHONET_MAX_MTU; | |
298 | dev->hard_header_len = 1; | |
299 | dev->dev_addr[0] = PN_MEDIA_USB; | |
300 | dev->addr_len = 1; | |
301 | dev->tx_queue_len = 3; | |
302 | ||
303 | dev->destructor = free_netdev; | |
304 | } | |
305 | ||
306 | /* | |
307 | * USB driver callbacks | |
308 | */ | |
309 | static struct usb_device_id usbpn_ids[] = { | |
310 | { | |
311 | .match_flags = USB_DEVICE_ID_MATCH_VENDOR | |
312 | | USB_DEVICE_ID_MATCH_INT_CLASS | |
313 | | USB_DEVICE_ID_MATCH_INT_SUBCLASS, | |
314 | .idVendor = 0x0421, /* Nokia */ | |
315 | .bInterfaceClass = USB_CLASS_COMM, | |
316 | .bInterfaceSubClass = 0xFE, | |
317 | }, | |
318 | { }, | |
319 | }; | |
320 | ||
321 | MODULE_DEVICE_TABLE(usb, usbpn_ids); | |
322 | ||
323 | static struct usb_driver usbpn_driver; | |
324 | ||
325 | int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id) | |
326 | { | |
327 | static const char ifname[] = "usbpn%d"; | |
328 | const struct usb_cdc_union_desc *union_header = NULL; | |
329 | const struct usb_cdc_header_desc *phonet_header = NULL; | |
330 | const struct usb_host_interface *data_desc; | |
331 | struct usb_interface *data_intf; | |
332 | struct usb_device *usbdev = interface_to_usbdev(intf); | |
333 | struct net_device *dev; | |
334 | struct usbpn_dev *pnd; | |
335 | u8 *data; | |
336 | int len, err; | |
337 | ||
338 | data = intf->altsetting->extra; | |
339 | len = intf->altsetting->extralen; | |
340 | while (len >= 3) { | |
341 | u8 dlen = data[0]; | |
342 | if (dlen < 3) | |
343 | return -EINVAL; | |
344 | ||
345 | /* bDescriptorType */ | |
346 | if (data[1] == USB_DT_CS_INTERFACE) { | |
347 | /* bDescriptorSubType */ | |
348 | switch (data[2]) { | |
349 | case USB_CDC_UNION_TYPE: | |
350 | if (union_header || dlen < 5) | |
351 | break; | |
352 | union_header = | |
353 | (struct usb_cdc_union_desc *)data; | |
354 | break; | |
355 | case 0xAB: | |
356 | if (phonet_header || dlen < 5) | |
357 | break; | |
358 | phonet_header = | |
359 | (struct usb_cdc_header_desc *)data; | |
360 | break; | |
361 | } | |
362 | } | |
363 | data += dlen; | |
364 | len -= dlen; | |
365 | } | |
366 | ||
367 | if (!union_header || !phonet_header) | |
368 | return -EINVAL; | |
369 | ||
370 | data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0); | |
371 | if (data_intf == NULL) | |
372 | return -ENODEV; | |
373 | /* Data interface has one inactive and one active setting */ | |
374 | if (data_intf->num_altsetting != 2) | |
375 | return -EINVAL; | |
8e95a202 JP |
376 | if (data_intf->altsetting[0].desc.bNumEndpoints == 0 && |
377 | data_intf->altsetting[1].desc.bNumEndpoints == 2) | |
87cf6560 RDC |
378 | data_desc = data_intf->altsetting + 1; |
379 | else | |
8e95a202 JP |
380 | if (data_intf->altsetting[0].desc.bNumEndpoints == 2 && |
381 | data_intf->altsetting[1].desc.bNumEndpoints == 0) | |
87cf6560 RDC |
382 | data_desc = data_intf->altsetting; |
383 | else | |
384 | return -EINVAL; | |
385 | ||
386 | dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size, | |
387 | ifname, usbpn_setup); | |
388 | if (!dev) | |
389 | return -ENOMEM; | |
390 | ||
391 | pnd = netdev_priv(dev); | |
392 | SET_NETDEV_DEV(dev, &intf->dev); | |
393 | netif_stop_queue(dev); | |
394 | ||
395 | pnd->dev = dev; | |
396 | pnd->usb = usb_get_dev(usbdev); | |
397 | pnd->intf = intf; | |
398 | pnd->data_intf = data_intf; | |
399 | spin_lock_init(&pnd->tx_lock); | |
400 | spin_lock_init(&pnd->rx_lock); | |
401 | /* Endpoints */ | |
402 | if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) { | |
403 | pnd->rx_pipe = usb_rcvbulkpipe(usbdev, | |
404 | data_desc->endpoint[0].desc.bEndpointAddress); | |
405 | pnd->tx_pipe = usb_sndbulkpipe(usbdev, | |
406 | data_desc->endpoint[1].desc.bEndpointAddress); | |
407 | } else { | |
408 | pnd->rx_pipe = usb_rcvbulkpipe(usbdev, | |
409 | data_desc->endpoint[1].desc.bEndpointAddress); | |
410 | pnd->tx_pipe = usb_sndbulkpipe(usbdev, | |
411 | data_desc->endpoint[0].desc.bEndpointAddress); | |
412 | } | |
413 | pnd->active_setting = data_desc - data_intf->altsetting; | |
414 | ||
415 | err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd); | |
416 | if (err) | |
417 | goto out; | |
418 | ||
419 | /* Force inactive mode until the network device is brought UP */ | |
420 | usb_set_interface(usbdev, union_header->bSlaveInterface0, | |
421 | !pnd->active_setting); | |
422 | usb_set_intfdata(intf, pnd); | |
423 | ||
424 | err = register_netdev(dev); | |
425 | if (err) { | |
426 | usb_driver_release_interface(&usbpn_driver, data_intf); | |
427 | goto out; | |
428 | } | |
429 | ||
430 | dev_dbg(&dev->dev, "USB CDC Phonet device found\n"); | |
431 | return 0; | |
432 | ||
433 | out: | |
434 | usb_set_intfdata(intf, NULL); | |
435 | free_netdev(dev); | |
436 | return err; | |
437 | } | |
438 | ||
439 | static void usbpn_disconnect(struct usb_interface *intf) | |
440 | { | |
441 | struct usbpn_dev *pnd = usb_get_intfdata(intf); | |
442 | struct usb_device *usb = pnd->usb; | |
443 | ||
444 | if (pnd->disconnected) | |
445 | return; | |
446 | ||
447 | pnd->disconnected = 1; | |
448 | usb_driver_release_interface(&usbpn_driver, | |
449 | (pnd->intf == intf) ? pnd->data_intf : pnd->intf); | |
450 | unregister_netdev(pnd->dev); | |
451 | usb_put_dev(usb); | |
452 | } | |
453 | ||
454 | static struct usb_driver usbpn_driver = { | |
455 | .name = "cdc_phonet", | |
456 | .probe = usbpn_probe, | |
457 | .disconnect = usbpn_disconnect, | |
458 | .id_table = usbpn_ids, | |
459 | }; | |
460 | ||
461 | static int __init usbpn_init(void) | |
462 | { | |
463 | return usb_register(&usbpn_driver); | |
464 | } | |
465 | ||
466 | static void __exit usbpn_exit(void) | |
467 | { | |
468 | usb_deregister(&usbpn_driver); | |
469 | } | |
470 | ||
471 | module_init(usbpn_init); | |
472 | module_exit(usbpn_exit); | |
473 | ||
474 | MODULE_AUTHOR("Remi Denis-Courmont"); | |
475 | MODULE_DESCRIPTION("USB CDC Phonet host interface"); | |
476 | MODULE_LICENSE("GPL"); |