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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/export.h> |
29 | #include <linux/err.h> |
30 | #include <linux/kdev_t.h> |
31 | #include <linux/random.h> |
32 | #include <linux/stat.h> |
33 | #include "uwb-internal.h" |
34 | |
35 | /* We initialize addresses to 0xff (invalid, as it is bcast) */ |
36 | static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr) |
37 | { |
38 | memset(&addr->data, 0xff, sizeof(addr->data)); |
39 | } |
40 | |
41 | static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr) |
42 | { |
43 | memset(&addr->data, 0xff, sizeof(addr->data)); |
44 | } |
45 | |
46 | /* @returns !0 if a device @addr is a broadcast address */ |
47 | static inline int uwb_dev_addr_bcast(const struct uwb_dev_addr *addr) |
48 | { |
49 | static const struct uwb_dev_addr bcast = { .data = { 0xff, 0xff } }; |
50 | return !uwb_dev_addr_cmp(addr, &bcast); |
51 | } |
52 | |
53 | /* |
54 | * Add callback @new to be called when an event occurs in @rc. |
55 | */ |
56 | int uwb_notifs_register(struct uwb_rc *rc, struct uwb_notifs_handler *new) |
57 | { |
58 | if (mutex_lock_interruptible(&rc->notifs_chain.mutex)) |
59 | return -ERESTARTSYS; |
60 | list_add(&new->list_node, &rc->notifs_chain.list); |
61 | mutex_unlock(&rc->notifs_chain.mutex); |
62 | return 0; |
63 | } |
64 | EXPORT_SYMBOL_GPL(uwb_notifs_register); |
65 | |
66 | /* |
67 | * Remove event handler (callback) |
68 | */ |
69 | int uwb_notifs_deregister(struct uwb_rc *rc, struct uwb_notifs_handler *entry) |
70 | { |
71 | if (mutex_lock_interruptible(&rc->notifs_chain.mutex)) |
72 | return -ERESTARTSYS; |
73 | list_del(&entry->list_node); |
74 | mutex_unlock(&rc->notifs_chain.mutex); |
75 | return 0; |
76 | } |
77 | EXPORT_SYMBOL_GPL(uwb_notifs_deregister); |
78 | |
79 | /* |
80 | * Notify all event handlers of a given event on @rc |
81 | * |
82 | * We are called with a valid reference to the device, or NULL if the |
83 | * event is not for a particular event (e.g., a BG join event). |
84 | */ |
85 | void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event) |
86 | { |
87 | struct uwb_notifs_handler *handler; |
88 | if (mutex_lock_interruptible(&rc->notifs_chain.mutex)) |
89 | return; |
90 | if (!list_empty(&rc->notifs_chain.list)) { |
91 | list_for_each_entry(handler, &rc->notifs_chain.list, list_node) { |
92 | handler->cb(handler->data, uwb_dev, event); |
93 | } |
94 | } |
95 | mutex_unlock(&rc->notifs_chain.mutex); |
96 | } |
97 | |
98 | /* |
99 | * Release the backing device of a uwb_dev that has been dynamically allocated. |
100 | */ |
101 | static void uwb_dev_sys_release(struct device *dev) |
102 | { |
103 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
104 | |
105 | uwb_bce_put(uwb_dev->bce); |
106 | memset(uwb_dev, 0x69, sizeof(*uwb_dev)); |
107 | kfree(uwb_dev); |
108 | } |
109 | |
110 | /* |
111 | * Initialize a UWB device instance |
112 | * |
113 | * Alloc, zero and call this function. |
114 | */ |
115 | void uwb_dev_init(struct uwb_dev *uwb_dev) |
116 | { |
117 | mutex_init(&uwb_dev->mutex); |
118 | device_initialize(&uwb_dev->dev); |
119 | uwb_dev->dev.release = uwb_dev_sys_release; |
120 | uwb_dev_addr_init(&uwb_dev->dev_addr); |
121 | uwb_mac_addr_init(&uwb_dev->mac_addr); |
122 | bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS); |
123 | } |
124 | |
125 | static ssize_t uwb_dev_EUI_48_show(struct device *dev, |
126 | struct device_attribute *attr, char *buf) |
127 | { |
128 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
129 | char addr[UWB_ADDR_STRSIZE]; |
130 | |
131 | uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr); |
132 | return sprintf(buf, "%s\n", addr); |
133 | } |
134 | static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL); |
135 | |
136 | static ssize_t uwb_dev_DevAddr_show(struct device *dev, |
137 | struct device_attribute *attr, char *buf) |
138 | { |
139 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
140 | char addr[UWB_ADDR_STRSIZE]; |
141 | |
142 | uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr); |
143 | return sprintf(buf, "%s\n", addr); |
144 | } |
145 | static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL); |
146 | |
147 | /* |
148 | * Show the BPST of this device. |
149 | * |
150 | * Calculated from the receive time of the device's beacon and it's |
151 | * slot number. |
152 | */ |
153 | static ssize_t uwb_dev_BPST_show(struct device *dev, |
154 | struct device_attribute *attr, char *buf) |
155 | { |
156 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
157 | struct uwb_beca_e *bce; |
158 | struct uwb_beacon_frame *bf; |
159 | u16 bpst; |
160 | |
161 | bce = uwb_dev->bce; |
162 | mutex_lock(&bce->mutex); |
163 | bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo; |
164 | bpst = bce->be->wBPSTOffset |
165 | - (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US); |
166 | mutex_unlock(&bce->mutex); |
167 | |
168 | return sprintf(buf, "%d\n", bpst); |
169 | } |
170 | static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL); |
171 | |
172 | /* |
173 | * Show the IEs a device is beaconing |
174 | * |
175 | * We need to access the beacon cache, so we just lock it really |
176 | * quick, print the IEs and unlock. |
177 | * |
178 | * We have a reference on the cache entry, so that should be |
179 | * quite safe. |
180 | */ |
181 | static ssize_t uwb_dev_IEs_show(struct device *dev, |
182 | struct device_attribute *attr, char *buf) |
183 | { |
184 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
185 | |
186 | return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE); |
187 | } |
188 | static DEVICE_ATTR(IEs, S_IRUGO | S_IWUSR, uwb_dev_IEs_show, NULL); |
189 | |
190 | static ssize_t uwb_dev_LQE_show(struct device *dev, |
191 | struct device_attribute *attr, char *buf) |
192 | { |
193 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
194 | struct uwb_beca_e *bce = uwb_dev->bce; |
195 | size_t result; |
196 | |
197 | mutex_lock(&bce->mutex); |
198 | result = stats_show(&uwb_dev->bce->lqe_stats, buf); |
199 | mutex_unlock(&bce->mutex); |
200 | return result; |
201 | } |
202 | |
203 | static ssize_t uwb_dev_LQE_store(struct device *dev, |
204 | struct device_attribute *attr, |
205 | const char *buf, size_t size) |
206 | { |
207 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
208 | struct uwb_beca_e *bce = uwb_dev->bce; |
209 | ssize_t result; |
210 | |
211 | mutex_lock(&bce->mutex); |
212 | result = stats_store(&uwb_dev->bce->lqe_stats, buf, size); |
213 | mutex_unlock(&bce->mutex); |
214 | return result; |
215 | } |
216 | static DEVICE_ATTR(LQE, S_IRUGO | S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store); |
217 | |
218 | static ssize_t uwb_dev_RSSI_show(struct device *dev, |
219 | struct device_attribute *attr, char *buf) |
220 | { |
221 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
222 | struct uwb_beca_e *bce = uwb_dev->bce; |
223 | size_t result; |
224 | |
225 | mutex_lock(&bce->mutex); |
226 | result = stats_show(&uwb_dev->bce->rssi_stats, buf); |
227 | mutex_unlock(&bce->mutex); |
228 | return result; |
229 | } |
230 | |
231 | static ssize_t uwb_dev_RSSI_store(struct device *dev, |
232 | struct device_attribute *attr, |
233 | const char *buf, size_t size) |
234 | { |
235 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
236 | struct uwb_beca_e *bce = uwb_dev->bce; |
237 | ssize_t result; |
238 | |
239 | mutex_lock(&bce->mutex); |
240 | result = stats_store(&uwb_dev->bce->rssi_stats, buf, size); |
241 | mutex_unlock(&bce->mutex); |
242 | return result; |
243 | } |
244 | static DEVICE_ATTR(RSSI, S_IRUGO | S_IWUSR, uwb_dev_RSSI_show, uwb_dev_RSSI_store); |
245 | |
246 | |
247 | static struct attribute *dev_attrs[] = { |
248 | &dev_attr_EUI_48.attr, |
249 | &dev_attr_DevAddr.attr, |
250 | &dev_attr_BPST.attr, |
251 | &dev_attr_IEs.attr, |
252 | &dev_attr_LQE.attr, |
253 | &dev_attr_RSSI.attr, |
254 | NULL, |
255 | }; |
256 | |
257 | static struct attribute_group dev_attr_group = { |
258 | .attrs = dev_attrs, |
259 | }; |
260 | |
261 | static const struct attribute_group *groups[] = { |
262 | &dev_attr_group, |
263 | NULL, |
264 | }; |
265 | |
266 | /** |
267 | * Device SYSFS registration |
268 | * |
269 | * |
270 | */ |
271 | static int __uwb_dev_sys_add(struct uwb_dev *uwb_dev, struct device *parent_dev) |
272 | { |
273 | struct device *dev; |
274 | |
275 | dev = &uwb_dev->dev; |
276 | /* Device sysfs files are only useful for neighbor devices not |
277 | local radio controllers. */ |
278 | if (&uwb_dev->rc->uwb_dev != uwb_dev) |
279 | dev->groups = groups; |
280 | dev->parent = parent_dev; |
281 | dev_set_drvdata(dev, uwb_dev); |
282 | |
283 | return device_add(dev); |
284 | } |
285 | |
286 | |
287 | static void __uwb_dev_sys_rm(struct uwb_dev *uwb_dev) |
288 | { |
289 | dev_set_drvdata(&uwb_dev->dev, NULL); |
290 | device_del(&uwb_dev->dev); |
291 | } |
292 | |
293 | |
294 | /** |
295 | * Register and initialize a new UWB device |
296 | * |
297 | * Did you call uwb_dev_init() on it? |
298 | * |
299 | * @parent_rc: is the parent radio controller who has the link to the |
300 | * device. When registering the UWB device that is a UWB |
301 | * Radio Controller, we point back to it. |
302 | * |
303 | * If registering the device that is part of a radio, caller has set |
304 | * rc->uwb_dev->dev. Otherwise it is to be left NULL--a new one will |
305 | * be allocated. |
306 | */ |
307 | int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev, |
308 | struct uwb_rc *parent_rc) |
309 | { |
310 | int result; |
311 | struct device *dev; |
312 | |
313 | BUG_ON(uwb_dev == NULL); |
314 | BUG_ON(parent_dev == NULL); |
315 | BUG_ON(parent_rc == NULL); |
316 | |
317 | mutex_lock(&uwb_dev->mutex); |
318 | dev = &uwb_dev->dev; |
319 | uwb_dev->rc = parent_rc; |
320 | result = __uwb_dev_sys_add(uwb_dev, parent_dev); |
321 | if (result < 0) |
322 | printk(KERN_ERR "UWB: unable to register dev %s with sysfs: %d\n", |
323 | dev_name(dev), result); |
324 | mutex_unlock(&uwb_dev->mutex); |
325 | return result; |
326 | } |
327 | |
328 | |
329 | void uwb_dev_rm(struct uwb_dev *uwb_dev) |
330 | { |
331 | mutex_lock(&uwb_dev->mutex); |
332 | __uwb_dev_sys_rm(uwb_dev); |
333 | mutex_unlock(&uwb_dev->mutex); |
334 | } |
335 | |
336 | |
337 | static |
338 | int __uwb_dev_try_get(struct device *dev, void *__target_uwb_dev) |
339 | { |
340 | struct uwb_dev *target_uwb_dev = __target_uwb_dev; |
341 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); |
342 | if (uwb_dev == target_uwb_dev) { |
343 | uwb_dev_get(uwb_dev); |
344 | return 1; |
345 | } else |
346 | return 0; |
347 | } |
348 | |
349 | |
350 | /** |
351 | * Given a UWB device descriptor, validate and refcount it |
352 | * |
353 | * @returns NULL if the device does not exist or is quiescing; the ptr to |
354 | * it otherwise. |
355 | */ |
356 | struct uwb_dev *uwb_dev_try_get(struct uwb_rc *rc, struct uwb_dev *uwb_dev) |
357 | { |
358 | if (uwb_dev_for_each(rc, __uwb_dev_try_get, uwb_dev)) |
359 | return uwb_dev; |
360 | else |
361 | return NULL; |
362 | } |
363 | EXPORT_SYMBOL_GPL(uwb_dev_try_get); |
364 | |
365 | |
366 | /** |
367 | * Remove a device from the system [grunt for other functions] |
368 | */ |
369 | int __uwb_dev_offair(struct uwb_dev *uwb_dev, struct uwb_rc *rc) |
370 | { |
371 | struct device *dev = &uwb_dev->dev; |
372 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; |
373 | |
374 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &uwb_dev->mac_addr); |
375 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &uwb_dev->dev_addr); |
376 | dev_info(dev, "uwb device (mac %s dev %s) disconnected from %s %s\n", |
377 | macbuf, devbuf, |
378 | rc ? rc->uwb_dev.dev.parent->bus->name : "n/a", |
379 | rc ? dev_name(rc->uwb_dev.dev.parent) : ""); |
380 | uwb_dev_rm(uwb_dev); |
381 | list_del(&uwb_dev->bce->node); |
382 | uwb_bce_put(uwb_dev->bce); |
383 | uwb_dev_put(uwb_dev); /* for the creation in _onair() */ |
384 | |
385 | return 0; |
386 | } |
387 | |
388 | |
389 | /** |
390 | * A device went off the air, clean up after it! |
391 | * |
392 | * This is called by the UWB Daemon (through the beacon purge function |
393 | * uwb_bcn_cache_purge) when it is detected that a device has been in |
394 | * radio silence for a while. |
395 | * |
396 | * If this device is actually a local radio controller we don't need |
397 | * to go through the offair process, as it is not registered as that. |
398 | * |
399 | * NOTE: uwb_bcn_cache.mutex is held! |
400 | */ |
401 | void uwbd_dev_offair(struct uwb_beca_e *bce) |
402 | { |
403 | struct uwb_dev *uwb_dev; |
404 | |
405 | uwb_dev = bce->uwb_dev; |
406 | if (uwb_dev) { |
407 | uwb_notify(uwb_dev->rc, uwb_dev, UWB_NOTIF_OFFAIR); |
408 | __uwb_dev_offair(uwb_dev, uwb_dev->rc); |
409 | } |
410 | } |
411 | |
412 | |
413 | /** |
414 | * A device went on the air, start it up! |
415 | * |
416 | * This is called by the UWB Daemon when it is detected that a device |
417 | * has popped up in the radio range of the radio controller. |
418 | * |
419 | * It will just create the freaking device, register the beacon and |
420 | * stuff and yatla, done. |
421 | * |
422 | * |
423 | * NOTE: uwb_beca.mutex is held, bce->mutex is held |
424 | */ |
425 | void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce) |
426 | { |
427 | int result; |
428 | struct device *dev = &rc->uwb_dev.dev; |
429 | struct uwb_dev *uwb_dev; |
430 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; |
431 | |
432 | uwb_mac_addr_print(macbuf, sizeof(macbuf), bce->mac_addr); |
433 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &bce->dev_addr); |
434 | uwb_dev = kzalloc(sizeof(struct uwb_dev), GFP_KERNEL); |
435 | if (uwb_dev == NULL) { |
436 | dev_err(dev, "new device %s: Cannot allocate memory\n", |
437 | macbuf); |
438 | return; |
439 | } |
440 | uwb_dev_init(uwb_dev); /* This sets refcnt to one, we own it */ |
441 | uwb_dev->mac_addr = *bce->mac_addr; |
442 | uwb_dev->dev_addr = bce->dev_addr; |
443 | dev_set_name(&uwb_dev->dev, macbuf); |
444 | result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc); |
445 | if (result < 0) { |
446 | dev_err(dev, "new device %s: cannot instantiate device\n", |
447 | macbuf); |
448 | goto error_dev_add; |
449 | } |
450 | /* plug the beacon cache */ |
451 | bce->uwb_dev = uwb_dev; |
452 | uwb_dev->bce = bce; |
453 | uwb_bce_get(bce); /* released in uwb_dev_sys_release() */ |
454 | dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n", |
455 | macbuf, devbuf, rc->uwb_dev.dev.parent->bus->name, |
456 | dev_name(rc->uwb_dev.dev.parent)); |
457 | uwb_notify(rc, uwb_dev, UWB_NOTIF_ONAIR); |
458 | return; |
459 | |
460 | error_dev_add: |
461 | kfree(uwb_dev); |
462 | return; |
463 | } |
464 | |
465 | /** |
466 | * Iterate over the list of UWB devices, calling a @function on each |
467 | * |
468 | * See docs for bus_for_each().... |
469 | * |
470 | * @rc: radio controller for the devices. |
471 | * @function: function to call. |
472 | * @priv: data to pass to @function. |
473 | * @returns: 0 if no invocation of function() returned a value |
474 | * different to zero. That value otherwise. |
475 | */ |
476 | int uwb_dev_for_each(struct uwb_rc *rc, uwb_dev_for_each_f function, void *priv) |
477 | { |
478 | return device_for_each_child(&rc->uwb_dev.dev, priv, function); |
479 | } |
480 | EXPORT_SYMBOL_GPL(uwb_dev_for_each); |
481 |
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