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Linux/drivers/net/usb/cdc-phonet.c

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

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