2 * WUSB Wire Adapter: WLP interface
3 * Driver for the Linux Network stack.
5 * Copyright (C) 2005-2006 Intel Corporation
6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU 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 Street, Fifth Floor, Boston, MA
25 * This implements a very simple network driver for the WLP USB
26 * device that is associated to a UWB (Ultra Wide Band) host.
28 * This is seen as an interface of a composite device. Once the UWB
29 * host has an association to another WLP capable device, the
30 * networking interface (aka WLP) can start to send packets back and
35 * - Hand cranked; can't ifup the interface until there is an association
37 * - BW allocation very simplistic [see i1480u_mas_set() and callees].
42 * ENTRY POINTS (driver model):
44 * i1480u_driver_{exit,init}(): initialization of the driver.
46 * i1480u_probe(): called by the driver code when a device
47 * matching 'i1480u_id_table' is connected.
49 * This allocs a netdev instance, inits with
50 * i1480u_add(), then registers_netdev().
54 * i1480u_disconnect(): device has been disconnected/module
58 #include <linux/if_arp.h>
59 #include <linux/etherdevice.h>
61 #include "i1480u-wlp.h"
66 void i1480u_init(struct i1480u *i1480u)
68 /* nothing so far... doesn't it suck? */
69 spin_lock_init(&i1480u->lock);
70 INIT_LIST_HEAD(&i1480u->tx_list);
71 spin_lock_init(&i1480u->tx_list_lock);
72 wlp_options_init(&i1480u->options);
73 edc_init(&i1480u->tx_errors);
74 edc_init(&i1480u->rx_errors);
75 #ifdef i1480u_FLOW_CONTROL
76 edc_init(&i1480u->notif_edc);
78 stats_init(&i1480u->lqe_stats);
79 stats_init(&i1480u->rssi_stats);
80 wlp_init(&i1480u->wlp);
84 * Fill WLP device information structure
86 * The structure will contain a few character arrays, each ending with a
87 * null terminated string. Each string has to fit (excluding terminating
88 * character) into a specified range obtained from the WLP substack.
90 * It is still not clear exactly how this device information should be
91 * obtained. Until we find out we use the USB device descriptor as backup, some
92 * information elements have intuitive mappings, other not.
95 void i1480u_fill_device_info(struct wlp *wlp, struct wlp_device_info *dev_info)
97 struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
98 struct usb_device *usb_dev = i1480u->usb_dev;
99 /* Treat device name and model name the same */
100 if (usb_dev->descriptor.iProduct) {
101 usb_string(usb_dev, usb_dev->descriptor.iProduct,
102 dev_info->name, sizeof(dev_info->name));
103 usb_string(usb_dev, usb_dev->descriptor.iProduct,
104 dev_info->model_name, sizeof(dev_info->model_name));
106 if (usb_dev->descriptor.iManufacturer)
107 usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
108 dev_info->manufacturer,
109 sizeof(dev_info->manufacturer));
110 scnprintf(dev_info->model_nr, sizeof(dev_info->model_nr), "%04x",
111 __le16_to_cpu(usb_dev->descriptor.bcdDevice));
112 if (usb_dev->descriptor.iSerialNumber)
113 usb_string(usb_dev, usb_dev->descriptor.iSerialNumber,
114 dev_info->serial, sizeof(dev_info->serial));
115 /* FIXME: where should we obtain category? */
116 dev_info->prim_dev_type.category = cpu_to_le16(WLP_DEV_CAT_OTHER);
117 /* FIXME: Complete OUI and OUIsubdiv attributes */
120 #ifdef i1480u_FLOW_CONTROL
122 * Callback for the notification endpoint
124 * This mostly controls the xon/xoff protocol. In case of hard error,
125 * we stop the queue. If not, we always retry.
128 void i1480u_notif_cb(struct urb *urb, struct pt_regs *regs)
130 struct i1480u *i1480u = urb->context;
131 struct usb_interface *usb_iface = i1480u->usb_iface;
132 struct device *dev = &usb_iface->dev;
135 switch (urb->status) {
136 case 0: /* Got valid data, do xon/xoff */
137 switch (i1480u->notif_buffer[0]) {
139 dev_err(dev, "XOFF STOPPING queue at %lu\n", jiffies);
140 netif_stop_queue(i1480u->net_dev);
143 dev_err(dev, "XON STARTING queue at %lu\n", jiffies);
144 netif_start_queue(i1480u->net_dev);
147 dev_err(dev, "NEP: unknown data 0x%02hhx\n",
148 i1480u->notif_buffer[0]);
151 case -ECONNRESET: /* Controlled situation ... */
152 case -ENOENT: /* we killed the URB... */
153 dev_err(dev, "NEP: URB reset/noent %d\n", urb->status);
155 case -ESHUTDOWN: /* going away! */
156 dev_err(dev, "NEP: URB down %d\n", urb->status);
158 default: /* Retry unless it gets ugly */
159 if (edc_inc(&i1480u->notif_edc, EDC_MAX_ERRORS,
160 EDC_ERROR_TIMEFRAME)) {
161 dev_err(dev, "NEP: URB max acceptable errors "
162 "exceeded; resetting device\n");
165 dev_err(dev, "NEP: URB error %d\n", urb->status);
168 result = usb_submit_urb(urb, GFP_ATOMIC);
170 dev_err(dev, "NEP: Can't resubmit URB: %d; resetting device\n",
177 wlp_reset_all(&i1480-wlp);
179 netif_stop_queue(i1480u->net_dev);
185 int i1480u_add(struct i1480u *i1480u, struct usb_interface *iface)
187 int result = -ENODEV;
188 struct wlp *wlp = &i1480u->wlp;
189 struct usb_device *usb_dev = interface_to_usbdev(iface);
190 struct net_device *net_dev = i1480u->net_dev;
192 struct uwb_dev *uwb_dev;
193 #ifdef i1480u_FLOW_CONTROL
194 struct usb_endpoint_descriptor *epd;
197 i1480u->usb_dev = usb_get_dev(usb_dev);
198 i1480u->usb_iface = iface;
199 rc = uwb_rc_get_by_grandpa(&i1480u->usb_dev->dev);
201 dev_err(&iface->dev, "Cannot get associated UWB Radio "
205 wlp->xmit_frame = i1480u_xmit_frame;
206 wlp->fill_device_info = i1480u_fill_device_info;
207 wlp->stop_queue = i1480u_stop_queue;
208 wlp->start_queue = i1480u_start_queue;
209 result = wlp_setup(wlp, rc, net_dev);
211 dev_err(&iface->dev, "Cannot setup WLP\n");
212 goto error_wlp_setup;
215 ether_setup(net_dev); /* make it an etherdevice */
216 uwb_dev = &rc->uwb_dev;
217 /* FIXME: hookup address change notifications? */
219 memcpy(net_dev->dev_addr, uwb_dev->mac_addr.data,
220 sizeof(net_dev->dev_addr));
222 net_dev->hard_header_len = sizeof(struct untd_hdr_cmp)
223 + sizeof(struct wlp_tx_hdr)
227 net_dev->tx_queue_len = 20; /* FIXME: maybe use 1000? */
229 /* net_dev->flags &= ~IFF_BROADCAST; FIXME: BUG in firmware */
230 /* FIXME: multicast disabled */
231 net_dev->flags &= ~IFF_MULTICAST;
232 net_dev->features &= ~NETIF_F_SG;
233 net_dev->features &= ~NETIF_F_FRAGLIST;
234 /* All NETIF_F_*_CSUM disabled */
235 net_dev->features |= NETIF_F_HIGHDMA;
236 net_dev->watchdog_timeo = 5*HZ; /* FIXME: a better default? */
238 net_dev->open = i1480u_open;
239 net_dev->stop = i1480u_stop;
240 net_dev->hard_start_xmit = i1480u_hard_start_xmit;
241 net_dev->tx_timeout = i1480u_tx_timeout;
242 net_dev->get_stats = i1480u_get_stats;
243 net_dev->set_config = i1480u_set_config;
244 net_dev->change_mtu = i1480u_change_mtu;
246 #ifdef i1480u_FLOW_CONTROL
247 /* Notification endpoint setup (submitted when we open the device) */
248 i1480u->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
249 if (i1480u->notif_urb == NULL) {
250 dev_err(&iface->dev, "Unable to allocate notification URB\n");
252 goto error_urb_alloc;
254 epd = &iface->cur_altsetting->endpoint[0].desc;
255 usb_fill_int_urb(i1480u->notif_urb, usb_dev,
256 usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
257 i1480u->notif_buffer, sizeof(i1480u->notif_buffer),
258 i1480u_notif_cb, i1480u, epd->bInterval);
262 i1480u->tx_inflight.max = i1480u_TX_INFLIGHT_MAX;
263 i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
264 i1480u->tx_inflight.restart_ts = jiffies;
265 usb_set_intfdata(iface, i1480u);
268 #ifdef i1480u_FLOW_CONTROL
275 usb_put_dev(i1480u->usb_dev);
279 static void i1480u_rm(struct i1480u *i1480u)
281 struct uwb_rc *rc = i1480u->wlp.rc;
282 usb_set_intfdata(i1480u->usb_iface, NULL);
283 #ifdef i1480u_FLOW_CONTROL
284 usb_kill_urb(i1480u->notif_urb);
285 usb_free_urb(i1480u->notif_urb);
287 wlp_remove(&i1480u->wlp);
289 usb_put_dev(i1480u->usb_dev);
292 /** Just setup @net_dev's i1480u private data */
293 static void i1480u_netdev_setup(struct net_device *net_dev)
295 struct i1480u *i1480u = netdev_priv(net_dev);
296 /* Initialize @i1480u */
297 memset(i1480u, 0, sizeof(*i1480u));
302 * Probe a i1480u interface and register it
304 * @iface: USB interface to link to
305 * @id: USB class/subclass/protocol id
306 * @returns: 0 if ok, < 0 errno code on error.
308 * Does basic housekeeping stuff and then allocs a netdev with space
309 * for the i1480u data. Initializes, registers in i1480u, registers in
310 * netdev, ready to go.
312 static int i1480u_probe(struct usb_interface *iface,
313 const struct usb_device_id *id)
316 struct net_device *net_dev;
317 struct device *dev = &iface->dev;
318 struct i1480u *i1480u;
320 /* Allocate instance [calls i1480u_netdev_setup() on it] */
322 net_dev = alloc_netdev(sizeof(*i1480u), "wlp%d", i1480u_netdev_setup);
323 if (net_dev == NULL) {
324 dev_err(dev, "no memory for network device instance\n");
325 goto error_alloc_netdev;
327 SET_NETDEV_DEV(net_dev, dev);
328 i1480u = netdev_priv(net_dev);
329 i1480u->net_dev = net_dev;
330 result = i1480u_add(i1480u, iface); /* Now setup all the wlp stuff */
332 dev_err(dev, "cannot add i1480u device: %d\n", result);
333 goto error_i1480u_add;
335 result = register_netdev(net_dev); /* Okey dokey, bring it up */
337 dev_err(dev, "cannot register network device: %d\n", result);
338 goto error_register_netdev;
340 i1480u_sysfs_setup(i1480u);
342 goto error_sysfs_init;
346 unregister_netdev(net_dev);
347 error_register_netdev:
350 free_netdev(net_dev);
357 * Disconect a i1480u from the system.
359 * i1480u_stop() has been called before, so al the rx and tx contexts
360 * have been taken down already. Make sure the queue is stopped,
361 * unregister netdev and i1480u, free and kill.
363 static void i1480u_disconnect(struct usb_interface *iface)
365 struct i1480u *i1480u;
366 struct net_device *net_dev;
368 i1480u = usb_get_intfdata(iface);
369 net_dev = i1480u->net_dev;
370 netif_stop_queue(net_dev);
371 #ifdef i1480u_FLOW_CONTROL
372 usb_kill_urb(i1480u->notif_urb);
374 i1480u_sysfs_release(i1480u);
375 unregister_netdev(net_dev);
377 free_netdev(net_dev);
380 static struct usb_device_id i1480u_id_table[] = {
382 .match_flags = USB_DEVICE_ID_MATCH_DEVICE \
383 | USB_DEVICE_ID_MATCH_DEV_INFO \
384 | USB_DEVICE_ID_MATCH_INT_INFO,
387 .bDeviceClass = 0xef,
388 .bDeviceSubClass = 0x02,
389 .bDeviceProtocol = 0x02,
390 .bInterfaceClass = 0xff,
391 .bInterfaceSubClass = 0xff,
392 .bInterfaceProtocol = 0xff,
396 MODULE_DEVICE_TABLE(usb, i1480u_id_table);
398 static struct usb_driver i1480u_driver = {
399 .name = KBUILD_MODNAME,
400 .probe = i1480u_probe,
401 .disconnect = i1480u_disconnect,
402 .id_table = i1480u_id_table,
405 static int __init i1480u_driver_init(void)
407 return usb_register(&i1480u_driver);
409 module_init(i1480u_driver_init);
412 static void __exit i1480u_driver_exit(void)
414 usb_deregister(&i1480u_driver);
416 module_exit(i1480u_driver_exit);
418 MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
419 MODULE_DESCRIPTION("i1480 Wireless UWB Link WLP networking for USB");
420 MODULE_LICENSE("GPL");