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183b9b59 IPG |
1 | /* |
2 | * Ultra Wide Band | |
3 | * Life cycle of radio controllers | |
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 | * A UWB radio controller is also a UWB device, so it embeds one... | |
26 | * | |
27 | * List of RCs comes from the 'struct class uwb_rc_class'. | |
28 | */ | |
29 | ||
30 | #include <linux/kernel.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/device.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/random.h> | |
35 | #include <linux/kdev_t.h> | |
36 | #include <linux/etherdevice.h> | |
37 | #include <linux/usb.h> | |
38 | ||
39 | #define D_LOCAL 1 | |
40 | #include <linux/uwb/debug.h> | |
41 | #include "uwb-internal.h" | |
42 | ||
43 | static int uwb_rc_index_match(struct device *dev, void *data) | |
44 | { | |
45 | int *index = data; | |
46 | struct uwb_rc *rc = dev_get_drvdata(dev); | |
47 | ||
48 | if (rc->index == *index) | |
49 | return 1; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static struct uwb_rc *uwb_rc_find_by_index(int index) | |
54 | { | |
55 | struct device *dev; | |
56 | struct uwb_rc *rc = NULL; | |
57 | ||
58 | dev = class_find_device(&uwb_rc_class, NULL, &index, uwb_rc_index_match); | |
59 | if (dev) | |
60 | rc = dev_get_drvdata(dev); | |
61 | return rc; | |
62 | } | |
63 | ||
64 | static int uwb_rc_new_index(void) | |
65 | { | |
66 | int index = 0; | |
67 | ||
68 | for (;;) { | |
69 | if (!uwb_rc_find_by_index(index)) | |
70 | return index; | |
71 | if (++index < 0) | |
72 | index = 0; | |
73 | } | |
74 | } | |
75 | ||
76 | /** | |
77 | * Release the backing device of a uwb_rc that has been dynamically allocated. | |
78 | */ | |
79 | static void uwb_rc_sys_release(struct device *dev) | |
80 | { | |
81 | struct uwb_dev *uwb_dev = container_of(dev, struct uwb_dev, dev); | |
82 | struct uwb_rc *rc = container_of(uwb_dev, struct uwb_rc, uwb_dev); | |
83 | ||
84 | uwb_rc_neh_destroy(rc); | |
85 | uwb_rc_ie_release(rc); | |
86 | d_printf(1, dev, "freed uwb_rc %p\n", rc); | |
87 | kfree(rc); | |
88 | } | |
89 | ||
90 | ||
91 | void uwb_rc_init(struct uwb_rc *rc) | |
92 | { | |
93 | struct uwb_dev *uwb_dev = &rc->uwb_dev; | |
94 | ||
95 | uwb_dev_init(uwb_dev); | |
96 | rc->uwb_dev.dev.class = &uwb_rc_class; | |
97 | rc->uwb_dev.dev.release = uwb_rc_sys_release; | |
98 | uwb_rc_neh_create(rc); | |
99 | rc->beaconing = -1; | |
100 | rc->scan_type = UWB_SCAN_DISABLED; | |
101 | INIT_LIST_HEAD(&rc->notifs_chain.list); | |
102 | mutex_init(&rc->notifs_chain.mutex); | |
103 | uwb_drp_avail_init(rc); | |
104 | uwb_rc_ie_init(rc); | |
105 | uwb_rsv_init(rc); | |
106 | uwb_rc_pal_init(rc); | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(uwb_rc_init); | |
109 | ||
110 | ||
111 | struct uwb_rc *uwb_rc_alloc(void) | |
112 | { | |
113 | struct uwb_rc *rc; | |
114 | rc = kzalloc(sizeof(*rc), GFP_KERNEL); | |
115 | if (rc == NULL) | |
116 | return NULL; | |
117 | uwb_rc_init(rc); | |
118 | return rc; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(uwb_rc_alloc); | |
121 | ||
122 | static struct attribute *rc_attrs[] = { | |
123 | &dev_attr_mac_address.attr, | |
124 | &dev_attr_scan.attr, | |
125 | &dev_attr_beacon.attr, | |
126 | NULL, | |
127 | }; | |
128 | ||
129 | static struct attribute_group rc_attr_group = { | |
130 | .attrs = rc_attrs, | |
131 | }; | |
132 | ||
133 | /* | |
134 | * Registration of sysfs specific stuff | |
135 | */ | |
136 | static int uwb_rc_sys_add(struct uwb_rc *rc) | |
137 | { | |
138 | return sysfs_create_group(&rc->uwb_dev.dev.kobj, &rc_attr_group); | |
139 | } | |
140 | ||
141 | ||
142 | static void __uwb_rc_sys_rm(struct uwb_rc *rc) | |
143 | { | |
144 | sysfs_remove_group(&rc->uwb_dev.dev.kobj, &rc_attr_group); | |
145 | } | |
146 | ||
147 | /** | |
148 | * uwb_rc_mac_addr_setup - get an RC's EUI-48 address or set it | |
149 | * @rc: the radio controller. | |
150 | * | |
151 | * If the EUI-48 address is 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF | |
152 | * then a random locally administered EUI-48 is generated and set on | |
153 | * the device. The probability of address collisions is sufficiently | |
154 | * unlikely (1/2^40 = 9.1e-13) that they're not checked for. | |
155 | */ | |
156 | static | |
157 | int uwb_rc_mac_addr_setup(struct uwb_rc *rc) | |
158 | { | |
159 | int result; | |
160 | struct device *dev = &rc->uwb_dev.dev; | |
161 | struct uwb_dev *uwb_dev = &rc->uwb_dev; | |
162 | char devname[UWB_ADDR_STRSIZE]; | |
163 | struct uwb_mac_addr addr; | |
164 | ||
165 | result = uwb_rc_mac_addr_get(rc, &addr); | |
166 | if (result < 0) { | |
167 | dev_err(dev, "cannot retrieve UWB EUI-48 address: %d\n", result); | |
168 | return result; | |
169 | } | |
170 | ||
171 | if (uwb_mac_addr_unset(&addr) || uwb_mac_addr_bcast(&addr)) { | |
172 | addr.data[0] = 0x02; /* locally adminstered and unicast */ | |
173 | get_random_bytes(&addr.data[1], sizeof(addr.data)-1); | |
174 | ||
175 | result = uwb_rc_mac_addr_set(rc, &addr); | |
176 | if (result < 0) { | |
177 | uwb_mac_addr_print(devname, sizeof(devname), &addr); | |
178 | dev_err(dev, "cannot set EUI-48 address %s: %d\n", | |
179 | devname, result); | |
180 | return result; | |
181 | } | |
182 | } | |
183 | uwb_dev->mac_addr = addr; | |
184 | return 0; | |
185 | } | |
186 | ||
187 | ||
188 | ||
189 | static int uwb_rc_setup(struct uwb_rc *rc) | |
190 | { | |
191 | int result; | |
192 | struct device *dev = &rc->uwb_dev.dev; | |
193 | ||
194 | result = uwb_rc_reset(rc); | |
195 | if (result < 0) { | |
196 | dev_err(dev, "cannot reset UWB radio: %d\n", result); | |
197 | goto error; | |
198 | } | |
199 | result = uwb_rc_mac_addr_setup(rc); | |
200 | if (result < 0) { | |
201 | dev_err(dev, "cannot setup UWB MAC address: %d\n", result); | |
202 | goto error; | |
203 | } | |
204 | result = uwb_rc_dev_addr_assign(rc); | |
205 | if (result < 0) { | |
206 | dev_err(dev, "cannot assign UWB DevAddr: %d\n", result); | |
207 | goto error; | |
208 | } | |
209 | result = uwb_rc_ie_setup(rc); | |
210 | if (result < 0) { | |
211 | dev_err(dev, "cannot setup IE subsystem: %d\n", result); | |
212 | goto error_ie_setup; | |
213 | } | |
183b9b59 IPG |
214 | result = uwb_rsv_setup(rc); |
215 | if (result < 0) { | |
216 | dev_err(dev, "cannot setup reservation subsystem: %d\n", result); | |
217 | goto error_rsv_setup; | |
218 | } | |
219 | uwb_dbg_add_rc(rc); | |
220 | return 0; | |
221 | ||
222 | error_rsv_setup: | |
223 | uwb_rc_ie_release(rc); | |
224 | error_ie_setup: | |
225 | error: | |
226 | return result; | |
227 | } | |
228 | ||
229 | ||
230 | /** | |
231 | * Register a new UWB radio controller | |
232 | * | |
233 | * Did you call uwb_rc_init() on your rc? | |
234 | * | |
235 | * We assume that this is being called with a > 0 refcount on | |
236 | * it [through ops->{get|put}_device(). We'll take our own, though. | |
237 | * | |
238 | * @parent_dev is our real device, the one that provides the actual UWB device | |
239 | */ | |
240 | int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv) | |
241 | { | |
242 | int result; | |
243 | struct device *dev; | |
244 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; | |
245 | ||
246 | rc->index = uwb_rc_new_index(); | |
247 | ||
248 | dev = &rc->uwb_dev.dev; | |
249 | dev_set_name(dev, "uwb%d", rc->index); | |
250 | ||
251 | rc->priv = priv; | |
252 | ||
253 | result = rc->start(rc); | |
254 | if (result < 0) | |
255 | goto error_rc_start; | |
256 | ||
257 | result = uwb_rc_setup(rc); | |
258 | if (result < 0) { | |
259 | dev_err(dev, "cannot setup UWB radio controller: %d\n", result); | |
260 | goto error_rc_setup; | |
261 | } | |
262 | ||
263 | result = uwb_dev_add(&rc->uwb_dev, parent_dev, rc); | |
264 | if (result < 0 && result != -EADDRNOTAVAIL) | |
265 | goto error_dev_add; | |
266 | ||
267 | result = uwb_rc_sys_add(rc); | |
268 | if (result < 0) { | |
269 | dev_err(parent_dev, "cannot register UWB radio controller " | |
270 | "dev attributes: %d\n", result); | |
271 | goto error_sys_add; | |
272 | } | |
273 | ||
274 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &rc->uwb_dev.mac_addr); | |
275 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &rc->uwb_dev.dev_addr); | |
276 | dev_info(dev, | |
277 | "new uwb radio controller (mac %s dev %s) on %s %s\n", | |
278 | macbuf, devbuf, parent_dev->bus->name, dev_name(parent_dev)); | |
279 | rc->ready = 1; | |
280 | return 0; | |
281 | ||
282 | error_sys_add: | |
283 | uwb_dev_rm(&rc->uwb_dev); | |
284 | error_dev_add: | |
285 | error_rc_setup: | |
286 | rc->stop(rc); | |
287 | uwbd_flush(rc); | |
288 | error_rc_start: | |
289 | return result; | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(uwb_rc_add); | |
292 | ||
293 | ||
294 | static int uwb_dev_offair_helper(struct device *dev, void *priv) | |
295 | { | |
296 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
297 | ||
298 | return __uwb_dev_offair(uwb_dev, uwb_dev->rc); | |
299 | } | |
300 | ||
301 | /* | |
302 | * Remove a Radio Controller; stop beaconing/scanning, disconnect all children | |
303 | */ | |
304 | void uwb_rc_rm(struct uwb_rc *rc) | |
305 | { | |
306 | rc->ready = 0; | |
307 | ||
308 | uwb_dbg_del_rc(rc); | |
309 | uwb_rsv_cleanup(rc); | |
310 | uwb_rc_ie_rm(rc, UWB_IDENTIFICATION_IE); | |
311 | if (rc->beaconing >= 0) | |
312 | uwb_rc_beacon(rc, -1, 0); | |
313 | if (rc->scan_type != UWB_SCAN_DISABLED) | |
314 | uwb_rc_scan(rc, rc->scanning, UWB_SCAN_DISABLED, 0); | |
315 | uwb_rc_reset(rc); | |
316 | ||
317 | rc->stop(rc); | |
318 | uwbd_flush(rc); | |
319 | ||
320 | uwb_dev_lock(&rc->uwb_dev); | |
321 | rc->priv = NULL; | |
322 | rc->cmd = NULL; | |
323 | uwb_dev_unlock(&rc->uwb_dev); | |
324 | mutex_lock(&uwb_beca.mutex); | |
325 | uwb_dev_for_each(rc, uwb_dev_offair_helper, NULL); | |
326 | __uwb_rc_sys_rm(rc); | |
327 | mutex_unlock(&uwb_beca.mutex); | |
328 | uwb_dev_rm(&rc->uwb_dev); | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(uwb_rc_rm); | |
331 | ||
332 | static int find_rc_try_get(struct device *dev, void *data) | |
333 | { | |
334 | struct uwb_rc *target_rc = data; | |
335 | struct uwb_rc *rc = dev_get_drvdata(dev); | |
336 | ||
337 | if (rc == NULL) { | |
338 | WARN_ON(1); | |
339 | return 0; | |
340 | } | |
341 | if (rc == target_rc) { | |
342 | if (rc->ready == 0) | |
343 | return 0; | |
344 | else | |
345 | return 1; | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
350 | /** | |
351 | * Given a radio controller descriptor, validate and refcount it | |
352 | * | |
353 | * @returns NULL if the rc does not exist or is quiescing; the ptr to | |
354 | * it otherwise. | |
355 | */ | |
356 | struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *target_rc) | |
357 | { | |
358 | struct device *dev; | |
359 | struct uwb_rc *rc = NULL; | |
360 | ||
361 | dev = class_find_device(&uwb_rc_class, NULL, target_rc, | |
362 | find_rc_try_get); | |
363 | if (dev) { | |
364 | rc = dev_get_drvdata(dev); | |
365 | __uwb_rc_get(rc); | |
366 | } | |
367 | return rc; | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(__uwb_rc_try_get); | |
370 | ||
371 | /* | |
372 | * RC get for external refcount acquirers... | |
373 | * | |
374 | * Increments the refcount of the device and it's backend modules | |
375 | */ | |
376 | static inline struct uwb_rc *uwb_rc_get(struct uwb_rc *rc) | |
377 | { | |
378 | if (rc->ready == 0) | |
379 | return NULL; | |
380 | uwb_dev_get(&rc->uwb_dev); | |
381 | return rc; | |
382 | } | |
383 | ||
384 | static int find_rc_grandpa(struct device *dev, void *data) | |
385 | { | |
386 | struct device *grandpa_dev = data; | |
387 | struct uwb_rc *rc = dev_get_drvdata(dev); | |
388 | ||
389 | if (rc->uwb_dev.dev.parent->parent == grandpa_dev) { | |
390 | rc = uwb_rc_get(rc); | |
391 | return 1; | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
396 | /** | |
397 | * Locate and refcount a radio controller given a common grand-parent | |
398 | * | |
399 | * @grandpa_dev Pointer to the 'grandparent' device structure. | |
400 | * @returns NULL If the rc does not exist or is quiescing; the ptr to | |
401 | * it otherwise, properly referenced. | |
402 | * | |
403 | * The Radio Control interface (or the UWB Radio Controller) is always | |
404 | * an interface of a device. The parent is the interface, the | |
405 | * grandparent is the device that encapsulates the interface. | |
406 | * | |
407 | * There is no need to lock around as the "grandpa" would be | |
408 | * refcounted by the target, and to remove the referemes, the | |
409 | * uwb_rc_class->sem would have to be taken--we hold it, ergo we | |
410 | * should be safe. | |
411 | */ | |
412 | struct uwb_rc *uwb_rc_get_by_grandpa(const struct device *grandpa_dev) | |
413 | { | |
414 | struct device *dev; | |
415 | struct uwb_rc *rc = NULL; | |
416 | ||
417 | dev = class_find_device(&uwb_rc_class, NULL, (void *)grandpa_dev, | |
418 | find_rc_grandpa); | |
419 | if (dev) | |
420 | rc = dev_get_drvdata(dev); | |
421 | return rc; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(uwb_rc_get_by_grandpa); | |
424 | ||
425 | /** | |
426 | * Find a radio controller by device address | |
427 | * | |
428 | * @returns the pointer to the radio controller, properly referenced | |
429 | */ | |
430 | static int find_rc_dev(struct device *dev, void *data) | |
431 | { | |
432 | struct uwb_dev_addr *addr = data; | |
433 | struct uwb_rc *rc = dev_get_drvdata(dev); | |
434 | ||
435 | if (rc == NULL) { | |
436 | WARN_ON(1); | |
437 | return 0; | |
438 | } | |
439 | if (!uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, addr)) { | |
440 | rc = uwb_rc_get(rc); | |
441 | return 1; | |
442 | } | |
443 | return 0; | |
444 | } | |
445 | ||
446 | struct uwb_rc *uwb_rc_get_by_dev(const struct uwb_dev_addr *addr) | |
447 | { | |
448 | struct device *dev; | |
449 | struct uwb_rc *rc = NULL; | |
450 | ||
451 | dev = class_find_device(&uwb_rc_class, NULL, (void *)addr, | |
452 | find_rc_dev); | |
453 | if (dev) | |
454 | rc = dev_get_drvdata(dev); | |
455 | ||
456 | return rc; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(uwb_rc_get_by_dev); | |
459 | ||
460 | /** | |
461 | * Drop a reference on a radio controller | |
462 | * | |
463 | * This is the version that should be done by entities external to the | |
464 | * UWB Radio Control stack (ie: clients of the API). | |
465 | */ | |
466 | void uwb_rc_put(struct uwb_rc *rc) | |
467 | { | |
468 | __uwb_rc_put(rc); | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(uwb_rc_put); | |
471 | ||
472 | /* | |
473 | * | |
474 | * | |
475 | */ | |
476 | ssize_t uwb_rc_print_IEs(struct uwb_rc *uwb_rc, char *buf, size_t size) | |
477 | { | |
478 | ssize_t result; | |
479 | struct uwb_rc_evt_get_ie *ie_info; | |
480 | struct uwb_buf_ctx ctx; | |
481 | ||
482 | result = uwb_rc_get_ie(uwb_rc, &ie_info); | |
483 | if (result < 0) | |
484 | goto error_get_ie; | |
485 | ctx.buf = buf; | |
486 | ctx.size = size; | |
487 | ctx.bytes = 0; | |
488 | uwb_ie_for_each(&uwb_rc->uwb_dev, uwb_ie_dump_hex, &ctx, | |
489 | ie_info->IEData, result - sizeof(*ie_info)); | |
490 | result = ctx.bytes; | |
491 | kfree(ie_info); | |
492 | error_get_ie: | |
493 | return result; | |
494 | } | |
495 |