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1 | /* |
2 | * Ultra Wide Band |
3 | * Life cycle of devices |
4 | * |
5 | * Copyright (C) 2005-2006 Intel Corporation |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> |
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 version |
10 | * 2 as published by the Free Software Foundation. |
11 | * |
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. |
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 Street, Fifth Floor, Boston, MA |
20 | * 02110-1301, USA. |
21 | * |
22 | * |
23 | * FIXME: docs |
24 | */ |
25 | #include <linux/kernel.h> |
26 | #include <linux/slab.h> |
27 | #include <linux/device.h> |
28 | #include <linux/err.h> |
29 | #include <linux/kdev_t.h> |
30 | #include <linux/random.h> |
31 | #include "uwb-internal.h" |
32 | |
33 | /* We initialize addresses to 0xff (invalid, as it is bcast) */ |
34 | static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr) |
35 | { |
36 | memset(&addr->data, 0xff, sizeof(addr->data)); |
37 | } |
38 | |
39 | static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr) |
40 | { |
41 | memset(&addr->data, 0xff, sizeof(addr->data)); |
42 | } |
43 | |
44 | /* @returns !0 if a device @addr is a broadcast address */ |
45 | static inline int uwb_dev_addr_bcast(const struct uwb_dev_addr *addr) |
46 | { |
47 | static const struct uwb_dev_addr bcast = { .data = { 0xff, 0xff } }; |
48 | return !uwb_dev_addr_cmp(addr, &bcast); |
49 | } |
50 | |
51 | /* |
52 | * Add callback @new to be called when an event occurs in @rc. |
53 | */ |
54 | int uwb_notifs_register(struct uwb_rc *rc, struct uwb_notifs_handler *new) |
55 | { |
56 | if (mutex_lock_interruptible(&rc->notifs_chain.mutex)) |
57 | return -ERESTARTSYS; |
58 | list_add(&new->list_node, &rc->notifs_chain.list); |
59 | mutex_unlock(&rc->notifs_chain.mutex); |
60 | return 0; |
61 | } |
62 | EXPORT_SYMBOL_GPL(uwb_notifs_register); |
63 | |
64 | /* |
65 | * Remove event handler (callback) |
66 | */ |
67 | int uwb_notifs_deregister(struct uwb_rc *rc, struct uwb_notifs_handler *entry) |
68 | { |
69 | if (mutex_lock_interruptible(&rc->notifs_chain.mutex)) |
70 | return -ERESTARTSYS; |
71 | list_del(&entry->list_node); |
72 | mutex_unlock(&rc->notifs_chain.mutex); |
73 | return 0; |
74 | } |
75 | EXPORT_SYMBOL_GPL(uwb_notifs_deregister); |
76 | |
77 | /* |
78 | * Notify all event handlers of a given event on @rc |
79 | * |
80 | * We are called with a valid reference to the device, or NULL if the |
81 | * event is not for a particular event (e.g., a BG join event). |
82 | */ |
83 | void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event) |
84 | { |
85 | struct uwb_notifs_handler *handler; |
86 | if (mutex_lock_interruptible(&rc->notifs_chain.mutex)) |
87 | return; |
88 | if (!list_empty(&rc->notifs_chain.list)) { |
89 | list_for_each_entry(handler, &rc->notifs_chain.list, list_node) { |
90 | handler->cb(handler->data, uwb_dev, event); |
91 | } |
92 | } |
93 | mutex_unlock(&rc->notifs_chain.mutex); |
94 | } |
95 | |
96 | /* |
97 | * Release the backing device of a uwb_dev that has been dynamically allocated. |
98 | */ |
99 | static void uwb_dev_sys_release(struct device *dev) |
100 | { |
101 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
102 | |
103 | uwb_bce_put(uwb_dev->bce); |
104 | memset(uwb_dev, 0x69, sizeof(*uwb_dev)); |
105 | kfree(uwb_dev); |
106 | } |
107 | |
108 | /* |
109 | * Initialize a UWB device instance |
110 | * |
111 | * Alloc, zero and call this function. |
112 | */ |
113 | void uwb_dev_init(struct uwb_dev *uwb_dev) |
114 | { |
115 | mutex_init(&uwb_dev->mutex); |
116 | device_initialize(&uwb_dev->dev); |
117 | uwb_dev->dev.release = uwb_dev_sys_release; |
118 | uwb_dev_addr_init(&uwb_dev->dev_addr); |
119 | uwb_mac_addr_init(&uwb_dev->mac_addr); |
120 | bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS); |
121 | } |
122 | |
123 | static ssize_t uwb_dev_EUI_48_show(struct device *dev, |
124 | struct device_attribute *attr, char *buf) |
125 | { |
126 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
127 | char addr[UWB_ADDR_STRSIZE]; |
128 | |
129 | uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr); |
130 | return sprintf(buf, "%s\n", addr); |
131 | } |
132 | static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL); |
133 | |
134 | static ssize_t uwb_dev_DevAddr_show(struct device *dev, |
135 | struct device_attribute *attr, char *buf) |
136 | { |
137 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
138 | char addr[UWB_ADDR_STRSIZE]; |
139 | |
140 | uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr); |
141 | return sprintf(buf, "%s\n", addr); |
142 | } |
143 | static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL); |
144 | |
145 | /* |
146 | * Show the BPST of this device. |
147 | * |
148 | * Calculated from the receive time of the device's beacon and it's |
149 | * slot number. |
150 | */ |
151 | static ssize_t uwb_dev_BPST_show(struct device *dev, |
152 | struct device_attribute *attr, char *buf) |
153 | { |
154 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
155 | struct uwb_beca_e *bce; |
156 | struct uwb_beacon_frame *bf; |
157 | u16 bpst; |
158 | |
159 | bce = uwb_dev->bce; |
160 | mutex_lock(&bce->mutex); |
161 | bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo; |
162 | bpst = bce->be->wBPSTOffset |
163 | - (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US); |
164 | mutex_unlock(&bce->mutex); |
165 | |
166 | return sprintf(buf, "%d\n", bpst); |
167 | } |
168 | static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL); |
169 | |
170 | /* |
171 | * Show the IEs a device is beaconing |
172 | * |
173 | * We need to access the beacon cache, so we just lock it really |
174 | * quick, print the IEs and unlock. |
175 | * |
176 | * We have a reference on the cache entry, so that should be |
177 | * quite safe. |
178 | */ |
179 | static ssize_t uwb_dev_IEs_show(struct device *dev, |
180 | struct device_attribute *attr, char *buf) |
181 | { |
182 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
183 | |
184 | return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE); |
185 | } |
186 | static DEVICE_ATTR(IEs, S_IRUGO | S_IWUSR, uwb_dev_IEs_show, NULL); |
187 | |
188 | static ssize_t uwb_dev_LQE_show(struct device *dev, |
189 | struct device_attribute *attr, char *buf) |
190 | { |
191 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
192 | struct uwb_beca_e *bce = uwb_dev->bce; |
193 | size_t result; |
194 | |
195 | mutex_lock(&bce->mutex); |
196 | result = stats_show(&uwb_dev->bce->lqe_stats, buf); |
197 | mutex_unlock(&bce->mutex); |
198 | return result; |
199 | } |
200 | |
201 | static ssize_t uwb_dev_LQE_store(struct device *dev, |
202 | struct device_attribute *attr, |
203 | const char *buf, size_t size) |
204 | { |
205 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
206 | struct uwb_beca_e *bce = uwb_dev->bce; |
207 | ssize_t result; |
208 | |
209 | mutex_lock(&bce->mutex); |
210 | result = stats_store(&uwb_dev->bce->lqe_stats, buf, size); |
211 | mutex_unlock(&bce->mutex); |
212 | return result; |
213 | } |
214 | static DEVICE_ATTR(LQE, S_IRUGO | S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store); |
215 | |
216 | static ssize_t uwb_dev_RSSI_show(struct device *dev, |
217 | struct device_attribute *attr, char *buf) |
218 | { |
219 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
220 | struct uwb_beca_e *bce = uwb_dev->bce; |
221 | size_t result; |
222 | |
223 | mutex_lock(&bce->mutex); |
224 | result = stats_show(&uwb_dev->bce->rssi_stats, buf); |
225 | mutex_unlock(&bce->mutex); |
226 | return result; |
227 | } |
228 | |
229 | static ssize_t uwb_dev_RSSI_store(struct device *dev, |
230 | struct device_attribute *attr, |
231 | const char *buf, size_t size) |
232 | { |
233 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
234 | struct uwb_beca_e *bce = uwb_dev->bce; |
235 | ssize_t result; |
236 | |
237 | mutex_lock(&bce->mutex); |
238 | result = stats_store(&uwb_dev->bce->rssi_stats, buf, size); |
239 | mutex_unlock(&bce->mutex); |
240 | return result; |
241 | } |
242 | static DEVICE_ATTR(RSSI, S_IRUGO | S_IWUSR, uwb_dev_RSSI_show, uwb_dev_RSSI_store); |
243 | |
244 | |
245 | static struct attribute *dev_attrs[] = { |
246 | &dev_attr_EUI_48.attr, |
247 | &dev_attr_DevAddr.attr, |
248 | &dev_attr_BPST.attr, |
249 | &dev_attr_IEs.attr, |
250 | &dev_attr_LQE.attr, |
251 | &dev_attr_RSSI.attr, |
252 | NULL, |
253 | }; |
254 | |
255 | static struct attribute_group dev_attr_group = { |
256 | .attrs = dev_attrs, |
257 | }; |
258 | |
259 | static const struct attribute_group *groups[] = { |
260 | &dev_attr_group, |
261 | NULL, |
262 | }; |
263 | |
264 | /** |
265 | * Device SYSFS registration |
266 | * |
267 | * |
268 | */ |
269 | static int __uwb_dev_sys_add(struct uwb_dev *uwb_dev, struct device *parent_dev) |
270 | { |
271 | struct device *dev; |
272 | |
273 | dev = &uwb_dev->dev; |
274 | /* Device sysfs files are only useful for neighbor devices not |
275 | local radio controllers. */ |
276 | if (&uwb_dev->rc->uwb_dev != uwb_dev) |
277 | dev->groups = groups; |
278 | dev->parent = parent_dev; |
279 | dev_set_drvdata(dev, uwb_dev); |
280 | |
281 | return device_add(dev); |
282 | } |
283 | |
284 | |
285 | static void __uwb_dev_sys_rm(struct uwb_dev *uwb_dev) |
286 | { |
287 | dev_set_drvdata(&uwb_dev->dev, NULL); |
288 | device_del(&uwb_dev->dev); |
289 | } |
290 | |
291 | |
292 | /** |
293 | * Register and initialize a new UWB device |
294 | * |
295 | * Did you call uwb_dev_init() on it? |
296 | * |
297 | * @parent_rc: is the parent radio controller who has the link to the |
298 | * device. When registering the UWB device that is a UWB |
299 | * Radio Controller, we point back to it. |
300 | * |
301 | * If registering the device that is part of a radio, caller has set |
302 | * rc->uwb_dev->dev. Otherwise it is to be left NULL--a new one will |
303 | * be allocated. |
304 | */ |
305 | int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev, |
306 | struct uwb_rc *parent_rc) |
307 | { |
308 | int result; |
309 | struct device *dev; |
310 | |
311 | BUG_ON(uwb_dev == NULL); |
312 | BUG_ON(parent_dev == NULL); |
313 | BUG_ON(parent_rc == NULL); |
314 | |
315 | mutex_lock(&uwb_dev->mutex); |
316 | dev = &uwb_dev->dev; |
317 | uwb_dev->rc = parent_rc; |
318 | result = __uwb_dev_sys_add(uwb_dev, parent_dev); |
319 | if (result < 0) |
320 | printk(KERN_ERR "UWB: unable to register dev %s with sysfs: %d\n", |
321 | dev_name(dev), result); |
322 | mutex_unlock(&uwb_dev->mutex); |
323 | return result; |
324 | } |
325 | |
326 | |
327 | void uwb_dev_rm(struct uwb_dev *uwb_dev) |
328 | { |
329 | mutex_lock(&uwb_dev->mutex); |
330 | __uwb_dev_sys_rm(uwb_dev); |
331 | mutex_unlock(&uwb_dev->mutex); |
332 | } |
333 | |
334 | |
335 | static |
336 | int __uwb_dev_try_get(struct device *dev, void *__target_uwb_dev) |
337 | { |
338 | struct uwb_dev *target_uwb_dev = __target_uwb_dev; |
339 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
340 | if (uwb_dev == target_uwb_dev) { |
341 | uwb_dev_get(uwb_dev); |
342 | return 1; |
343 | } else |
344 | return 0; |
345 | } |
346 | |
347 | |
348 | /** |
349 | * Given a UWB device descriptor, validate and refcount it |
350 | * |
351 | * @returns NULL if the device does not exist or is quiescing; the ptr to |
352 | * it otherwise. |
353 | */ |
354 | struct uwb_dev *uwb_dev_try_get(struct uwb_rc *rc, struct uwb_dev *uwb_dev) |
355 | { |
356 | if (uwb_dev_for_each(rc, __uwb_dev_try_get, uwb_dev)) |
357 | return uwb_dev; |
358 | else |
359 | return NULL; |
360 | } |
361 | EXPORT_SYMBOL_GPL(uwb_dev_try_get); |
362 | |
363 | |
364 | /** |
365 | * Remove a device from the system [grunt for other functions] |
366 | */ |
367 | int __uwb_dev_offair(struct uwb_dev *uwb_dev, struct uwb_rc *rc) |
368 | { |
369 | struct device *dev = &uwb_dev->dev; |
370 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; |
371 | |
372 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &uwb_dev->mac_addr); |
373 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &uwb_dev->dev_addr); |
374 | dev_info(dev, "uwb device (mac %s dev %s) disconnected from %s %s\n", |
375 | macbuf, devbuf, |
376 | rc ? rc->uwb_dev.dev.parent->bus->name : "n/a", |
377 | rc ? dev_name(rc->uwb_dev.dev.parent) : ""); |
378 | uwb_dev_rm(uwb_dev); |
379 | list_del(&uwb_dev->bce->node); |
380 | uwb_bce_put(uwb_dev->bce); |
381 | uwb_dev_put(uwb_dev); /* for the creation in _onair() */ |
382 | |
383 | return 0; |
384 | } |
385 | |
386 | |
387 | /** |
388 | * A device went off the air, clean up after it! |
389 | * |
390 | * This is called by the UWB Daemon (through the beacon purge function |
391 | * uwb_bcn_cache_purge) when it is detected that a device has been in |
392 | * radio silence for a while. |
393 | * |
394 | * If this device is actually a local radio controller we don't need |
395 | * to go through the offair process, as it is not registered as that. |
396 | * |
397 | * NOTE: uwb_bcn_cache.mutex is held! |
398 | */ |
399 | void uwbd_dev_offair(struct uwb_beca_e *bce) |
400 | { |
401 | struct uwb_dev *uwb_dev; |
402 | |
403 | uwb_dev = bce->uwb_dev; |
404 | if (uwb_dev) { |
405 | uwb_notify(uwb_dev->rc, uwb_dev, UWB_NOTIF_OFFAIR); |
406 | __uwb_dev_offair(uwb_dev, uwb_dev->rc); |
407 | } |
408 | } |
409 | |
410 | |
411 | /** |
412 | * A device went on the air, start it up! |
413 | * |
414 | * This is called by the UWB Daemon when it is detected that a device |
415 | * has popped up in the radio range of the radio controller. |
416 | * |
417 | * It will just create the freaking device, register the beacon and |
418 | * stuff and yatla, done. |
419 | * |
420 | * |
421 | * NOTE: uwb_beca.mutex is held, bce->mutex is held |
422 | */ |
423 | void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce) |
424 | { |
425 | int result; |
426 | struct device *dev = &rc->uwb_dev.dev; |
427 | struct uwb_dev *uwb_dev; |
428 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; |
429 | |
430 | uwb_mac_addr_print(macbuf, sizeof(macbuf), bce->mac_addr); |
431 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &bce->dev_addr); |
432 | uwb_dev = kzalloc(sizeof(struct uwb_dev), GFP_KERNEL); |
433 | if (uwb_dev == NULL) { |
434 | dev_err(dev, "new device %s: Cannot allocate memory\n", |
435 | macbuf); |
436 | return; |
437 | } |
438 | uwb_dev_init(uwb_dev); /* This sets refcnt to one, we own it */ |
439 | uwb_dev->mac_addr = *bce->mac_addr; |
440 | uwb_dev->dev_addr = bce->dev_addr; |
441 | dev_set_name(&uwb_dev->dev, macbuf); |
442 | result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc); |
443 | if (result < 0) { |
444 | dev_err(dev, "new device %s: cannot instantiate device\n", |
445 | macbuf); |
446 | goto error_dev_add; |
447 | } |
448 | /* plug the beacon cache */ |
449 | bce->uwb_dev = uwb_dev; |
450 | uwb_dev->bce = bce; |
451 | uwb_bce_get(bce); /* released in uwb_dev_sys_release() */ |
452 | dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n", |
453 | macbuf, devbuf, rc->uwb_dev.dev.parent->bus->name, |
454 | dev_name(rc->uwb_dev.dev.parent)); |
455 | uwb_notify(rc, uwb_dev, UWB_NOTIF_ONAIR); |
456 | return; |
457 | |
458 | error_dev_add: |
459 | kfree(uwb_dev); |
460 | return; |
461 | } |
462 | |
463 | /** |
464 | * Iterate over the list of UWB devices, calling a @function on each |
465 | * |
466 | * See docs for bus_for_each().... |
467 | * |
468 | * @rc: radio controller for the devices. |
469 | * @function: function to call. |
470 | * @priv: data to pass to @function. |
471 | * @returns: 0 if no invocation of function() returned a value |
472 | * different to zero. That value otherwise. |
473 | */ |
474 | int uwb_dev_for_each(struct uwb_rc *rc, uwb_dev_for_each_f function, void *priv) |
475 | { |
476 | return device_for_each_child(&rc->uwb_dev.dev, priv, function); |
477 | } |
478 | EXPORT_SYMBOL_GPL(uwb_dev_for_each); |
479 |
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