sfc: Don't use enums as a bitmask.
[zen-stable.git] / drivers / net / usb / cdc-phonet.c
blobf967913e11bc2b7becdcf6936f180d06f7dab6e1
1 /*
2 * phonet.c -- USB CDC Phonet host driver
4 * Copyright (C) 2008-2009 Nokia Corporation. All rights reserved.
6 * Author: Rémi Denis-Courmont
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.
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.
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
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/gfp.h>
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>
31 #include <linux/phonet.h>
33 #define PN_MEDIA_USB 0x1B
35 static const unsigned rxq_size = 17;
37 struct usbpn_dev {
38 struct net_device *dev;
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;
46 unsigned tx_queue;
47 spinlock_t tx_lock;
49 spinlock_t rx_lock;
50 struct sk_buff *rx_skb;
51 struct urb *urbs[0];
54 static void tx_complete(struct urb *req);
55 static void rx_complete(struct urb *req);
58 * Network device callbacks
60 static netdev_tx_t usbpn_xmit(struct sk_buff *skb, struct net_device *dev)
62 struct usbpn_dev *pnd = netdev_priv(dev);
63 struct urb *req = NULL;
64 unsigned long flags;
65 int err;
67 if (skb->protocol != htons(ETH_P_PHONET))
68 goto drop;
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;
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);
87 return NETDEV_TX_OK;
89 drop:
90 dev_kfree_skb(skb);
91 dev->stats.tx_dropped++;
92 return NETDEV_TX_OK;
95 static void tx_complete(struct urb *req)
97 struct sk_buff *skb = req->context;
98 struct net_device *dev = skb->dev;
99 struct usbpn_dev *pnd = netdev_priv(dev);
100 int status = req->status;
102 switch (status) {
103 case 0:
104 dev->stats.tx_bytes += skb->len;
105 break;
107 case -ENOENT:
108 case -ECONNRESET:
109 case -ESHUTDOWN:
110 dev->stats.tx_aborted_errors++;
111 default:
112 dev->stats.tx_errors++;
113 dev_dbg(&dev->dev, "TX error (%d)\n", status);
115 dev->stats.tx_packets++;
117 spin_lock(&pnd->tx_lock);
118 pnd->tx_queue--;
119 netif_wake_queue(dev);
120 spin_unlock(&pnd->tx_lock);
122 dev_kfree_skb_any(skb);
123 usb_free_urb(req);
126 static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
128 struct net_device *dev = pnd->dev;
129 struct page *page;
130 int err;
132 page = __netdev_alloc_page(dev, gfp_flags);
133 if (!page)
134 return -ENOMEM;
136 usb_fill_bulk_urb(req, pnd->usb, pnd->rx_pipe, page_address(page),
137 PAGE_SIZE, rx_complete, dev);
138 req->transfer_flags = 0;
139 err = usb_submit_urb(req, gfp_flags);
140 if (unlikely(err)) {
141 dev_dbg(&dev->dev, "RX submit error (%d)\n", err);
142 netdev_free_page(dev, page);
144 return err;
147 static void rx_complete(struct urb *req)
149 struct net_device *dev = req->context;
150 struct usbpn_dev *pnd = netdev_priv(dev);
151 struct page *page = virt_to_page(req->transfer_buffer);
152 struct sk_buff *skb;
153 unsigned long flags;
154 int status = req->status;
156 switch (status) {
157 case 0:
158 spin_lock_irqsave(&pnd->rx_lock, flags);
159 skb = pnd->rx_skb;
160 if (!skb) {
161 skb = pnd->rx_skb = netdev_alloc_skb(dev, 12);
162 if (likely(skb)) {
163 /* Can't use pskb_pull() on page in IRQ */
164 memcpy(skb_put(skb, 1), page_address(page), 1);
165 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
166 page, 1, req->actual_length);
167 page = NULL;
169 } else {
170 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
171 page, 0, req->actual_length);
172 page = NULL;
174 if (req->actual_length < PAGE_SIZE)
175 pnd->rx_skb = NULL; /* Last fragment */
176 else
177 skb = NULL;
178 spin_unlock_irqrestore(&pnd->rx_lock, flags);
179 if (skb) {
180 skb->protocol = htons(ETH_P_PHONET);
181 skb_reset_mac_header(skb);
182 __skb_pull(skb, 1);
183 skb->dev = dev;
184 dev->stats.rx_packets++;
185 dev->stats.rx_bytes += skb->len;
187 netif_rx(skb);
189 goto resubmit;
191 case -ENOENT:
192 case -ECONNRESET:
193 case -ESHUTDOWN:
194 req = NULL;
195 break;
197 case -EOVERFLOW:
198 dev->stats.rx_over_errors++;
199 dev_dbg(&dev->dev, "RX overflow\n");
200 break;
202 case -EILSEQ:
203 dev->stats.rx_crc_errors++;
204 break;
207 dev->stats.rx_errors++;
208 resubmit:
209 if (page)
210 netdev_free_page(dev, page);
211 if (req)
212 rx_submit(pnd, req, GFP_ATOMIC);
215 static int usbpn_close(struct net_device *dev);
217 static int usbpn_open(struct net_device *dev)
219 struct usbpn_dev *pnd = netdev_priv(dev);
220 int err;
221 unsigned i;
222 unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
224 err = usb_set_interface(pnd->usb, num, pnd->active_setting);
225 if (err)
226 return err;
228 for (i = 0; i < rxq_size; i++) {
229 struct urb *req = usb_alloc_urb(0, GFP_KERNEL);
231 if (!req || rx_submit(pnd, req, GFP_KERNEL)) {
232 usbpn_close(dev);
233 return -ENOMEM;
235 pnd->urbs[i] = req;
238 netif_wake_queue(dev);
239 return 0;
242 static int usbpn_close(struct net_device *dev)
244 struct usbpn_dev *pnd = netdev_priv(dev);
245 unsigned i;
246 unsigned num = pnd->data_intf->cur_altsetting->desc.bInterfaceNumber;
248 netif_stop_queue(dev);
250 for (i = 0; i < rxq_size; i++) {
251 struct urb *req = pnd->urbs[i];
253 if (!req)
254 continue;
255 usb_kill_urb(req);
256 usb_free_urb(req);
257 pnd->urbs[i] = NULL;
260 return usb_set_interface(pnd->usb, num, !pnd->active_setting);
263 static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
265 struct if_phonet_req *req = (struct if_phonet_req *)ifr;
267 switch (cmd) {
268 case SIOCPNGAUTOCONF:
269 req->ifr_phonet_autoconf.device = PN_DEV_PC;
270 return 0;
272 return -ENOIOCTLCMD;
275 static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
277 if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
278 return -EINVAL;
280 dev->mtu = new_mtu;
281 return 0;
284 static const struct net_device_ops usbpn_ops = {
285 .ndo_open = usbpn_open,
286 .ndo_stop = usbpn_close,
287 .ndo_start_xmit = usbpn_xmit,
288 .ndo_do_ioctl = usbpn_ioctl,
289 .ndo_change_mtu = usbpn_set_mtu,
292 static void usbpn_setup(struct net_device *dev)
294 dev->features = 0;
295 dev->netdev_ops = &usbpn_ops,
296 dev->header_ops = &phonet_header_ops;
297 dev->type = ARPHRD_PHONET;
298 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
299 dev->mtu = PHONET_MAX_MTU;
300 dev->hard_header_len = 1;
301 dev->dev_addr[0] = PN_MEDIA_USB;
302 dev->addr_len = 1;
303 dev->tx_queue_len = 3;
305 dev->destructor = free_netdev;
309 * USB driver callbacks
311 static struct usb_device_id usbpn_ids[] = {
313 .match_flags = USB_DEVICE_ID_MATCH_VENDOR
314 | USB_DEVICE_ID_MATCH_INT_CLASS
315 | USB_DEVICE_ID_MATCH_INT_SUBCLASS,
316 .idVendor = 0x0421, /* Nokia */
317 .bInterfaceClass = USB_CLASS_COMM,
318 .bInterfaceSubClass = 0xFE,
320 { },
323 MODULE_DEVICE_TABLE(usb, usbpn_ids);
325 static struct usb_driver usbpn_driver;
327 int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
329 static const char ifname[] = "usbpn%d";
330 const struct usb_cdc_union_desc *union_header = NULL;
331 const struct usb_host_interface *data_desc;
332 struct usb_interface *data_intf;
333 struct usb_device *usbdev = interface_to_usbdev(intf);
334 struct net_device *dev;
335 struct usbpn_dev *pnd;
336 u8 *data;
337 int phonet = 0;
338 int len, err;
340 data = intf->altsetting->extra;
341 len = intf->altsetting->extralen;
342 while (len >= 3) {
343 u8 dlen = data[0];
344 if (dlen < 3)
345 return -EINVAL;
347 /* bDescriptorType */
348 if (data[1] == USB_DT_CS_INTERFACE) {
349 /* bDescriptorSubType */
350 switch (data[2]) {
351 case USB_CDC_UNION_TYPE:
352 if (union_header || dlen < 5)
353 break;
354 union_header =
355 (struct usb_cdc_union_desc *)data;
356 break;
357 case 0xAB:
358 phonet = 1;
359 break;
362 data += dlen;
363 len -= dlen;
366 if (!union_header || !phonet)
367 return -EINVAL;
369 data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
370 if (data_intf == NULL)
371 return -ENODEV;
372 /* Data interface has one inactive and one active setting */
373 if (data_intf->num_altsetting != 2)
374 return -EINVAL;
375 if (data_intf->altsetting[0].desc.bNumEndpoints == 0 &&
376 data_intf->altsetting[1].desc.bNumEndpoints == 2)
377 data_desc = data_intf->altsetting + 1;
378 else
379 if (data_intf->altsetting[0].desc.bNumEndpoints == 2 &&
380 data_intf->altsetting[1].desc.bNumEndpoints == 0)
381 data_desc = data_intf->altsetting;
382 else
383 return -EINVAL;
385 dev = alloc_netdev(sizeof(*pnd) + sizeof(pnd->urbs[0]) * rxq_size,
386 ifname, usbpn_setup);
387 if (!dev)
388 return -ENOMEM;
390 pnd = netdev_priv(dev);
391 SET_NETDEV_DEV(dev, &intf->dev);
393 pnd->dev = dev;
394 pnd->usb = usb_get_dev(usbdev);
395 pnd->intf = intf;
396 pnd->data_intf = data_intf;
397 spin_lock_init(&pnd->tx_lock);
398 spin_lock_init(&pnd->rx_lock);
399 /* Endpoints */
400 if (usb_pipein(data_desc->endpoint[0].desc.bEndpointAddress)) {
401 pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
402 data_desc->endpoint[0].desc.bEndpointAddress);
403 pnd->tx_pipe = usb_sndbulkpipe(usbdev,
404 data_desc->endpoint[1].desc.bEndpointAddress);
405 } else {
406 pnd->rx_pipe = usb_rcvbulkpipe(usbdev,
407 data_desc->endpoint[1].desc.bEndpointAddress);
408 pnd->tx_pipe = usb_sndbulkpipe(usbdev,
409 data_desc->endpoint[0].desc.bEndpointAddress);
411 pnd->active_setting = data_desc - data_intf->altsetting;
413 err = usb_driver_claim_interface(&usbpn_driver, data_intf, pnd);
414 if (err)
415 goto out;
417 /* Force inactive mode until the network device is brought UP */
418 usb_set_interface(usbdev, union_header->bSlaveInterface0,
419 !pnd->active_setting);
420 usb_set_intfdata(intf, pnd);
422 err = register_netdev(dev);
423 if (err) {
424 usb_driver_release_interface(&usbpn_driver, data_intf);
425 goto out;
428 dev_dbg(&dev->dev, "USB CDC Phonet device found\n");
429 return 0;
431 out:
432 usb_set_intfdata(intf, NULL);
433 free_netdev(dev);
434 return err;
437 static void usbpn_disconnect(struct usb_interface *intf)
439 struct usbpn_dev *pnd = usb_get_intfdata(intf);
440 struct usb_device *usb = pnd->usb;
442 if (pnd->disconnected)
443 return;
445 pnd->disconnected = 1;
446 usb_driver_release_interface(&usbpn_driver,
447 (pnd->intf == intf) ? pnd->data_intf : pnd->intf);
448 unregister_netdev(pnd->dev);
449 usb_put_dev(usb);
452 static struct usb_driver usbpn_driver = {
453 .name = "cdc_phonet",
454 .probe = usbpn_probe,
455 .disconnect = usbpn_disconnect,
456 .id_table = usbpn_ids,
459 static int __init usbpn_init(void)
461 return usb_register(&usbpn_driver);
464 static void __exit usbpn_exit(void)
466 usb_deregister(&usbpn_driver);
469 module_init(usbpn_init);
470 module_exit(usbpn_exit);
472 MODULE_AUTHOR("Remi Denis-Courmont");
473 MODULE_DESCRIPTION("USB CDC Phonet host interface");
474 MODULE_LICENSE("GPL");