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Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +01001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Paul Gortmaker475c0a62011-07-10 13:18:02 -040039#include <linux/export.h>
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +010040
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +010041#include "uwb-internal.h"
42
43static 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
53static 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
64static 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 */
79static 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
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +010084 uwb_rc_ie_release(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +010085 kfree(rc);
86}
87
88
89void uwb_rc_init(struct uwb_rc *rc)
90{
91 struct uwb_dev *uwb_dev = &rc->uwb_dev;
92
93 uwb_dev_init(uwb_dev);
94 rc->uwb_dev.dev.class = &uwb_rc_class;
95 rc->uwb_dev.dev.release = uwb_rc_sys_release;
96 uwb_rc_neh_create(rc);
97 rc->beaconing = -1;
98 rc->scan_type = UWB_SCAN_DISABLED;
99 INIT_LIST_HEAD(&rc->notifs_chain.list);
100 mutex_init(&rc->notifs_chain.mutex);
Stefano Panellafec1a592008-11-04 15:39:08 +0000101 INIT_LIST_HEAD(&rc->uwb_beca.list);
102 mutex_init(&rc->uwb_beca.mutex);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100103 uwb_drp_avail_init(rc);
104 uwb_rc_ie_init(rc);
105 uwb_rsv_init(rc);
106 uwb_rc_pal_init(rc);
107}
108EXPORT_SYMBOL_GPL(uwb_rc_init);
109
110
111struct 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}
120EXPORT_SYMBOL_GPL(uwb_rc_alloc);
121
122static struct attribute *rc_attrs[] = {
123 &dev_attr_mac_address.attr,
124 &dev_attr_scan.attr,
125 &dev_attr_beacon.attr,
126 NULL,
127};
128
129static struct attribute_group rc_attr_group = {
130 .attrs = rc_attrs,
131};
132
133/*
134 * Registration of sysfs specific stuff
135 */
136static 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
142static 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 */
156static
157int 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)) {
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300172 addr.data[0] = 0x02; /* locally administered and unicast */
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100173 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
189static int uwb_rc_setup(struct uwb_rc *rc)
190{
191 int result;
192 struct device *dev = &rc->uwb_dev.dev;
193
David Vrabel6fae35f2008-11-17 15:53:42 +0000194 result = uwb_radio_setup(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100195 if (result < 0) {
David Vrabel6fae35f2008-11-17 15:53:42 +0000196 dev_err(dev, "cannot setup UWB radio: %d\n", result);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100197 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 }
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100214 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
222error_rsv_setup:
223 uwb_rc_ie_release(rc);
224error_ie_setup:
225error:
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 */
240int 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
Stefano Panellafec1a592008-11-04 15:39:08 +0000253 init_waitqueue_head(&rc->uwbd.wq);
254 INIT_LIST_HEAD(&rc->uwbd.event_list);
255 spin_lock_init(&rc->uwbd.event_list_lock);
256
257 uwbd_start(rc);
258
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100259 result = rc->start(rc);
260 if (result < 0)
261 goto error_rc_start;
262
263 result = uwb_rc_setup(rc);
264 if (result < 0) {
265 dev_err(dev, "cannot setup UWB radio controller: %d\n", result);
266 goto error_rc_setup;
267 }
268
269 result = uwb_dev_add(&rc->uwb_dev, parent_dev, rc);
270 if (result < 0 && result != -EADDRNOTAVAIL)
271 goto error_dev_add;
272
273 result = uwb_rc_sys_add(rc);
274 if (result < 0) {
275 dev_err(parent_dev, "cannot register UWB radio controller "
276 "dev attributes: %d\n", result);
277 goto error_sys_add;
278 }
279
280 uwb_mac_addr_print(macbuf, sizeof(macbuf), &rc->uwb_dev.mac_addr);
281 uwb_dev_addr_print(devbuf, sizeof(devbuf), &rc->uwb_dev.dev_addr);
282 dev_info(dev,
283 "new uwb radio controller (mac %s dev %s) on %s %s\n",
284 macbuf, devbuf, parent_dev->bus->name, dev_name(parent_dev));
285 rc->ready = 1;
286 return 0;
287
288error_sys_add:
289 uwb_dev_rm(&rc->uwb_dev);
290error_dev_add:
291error_rc_setup:
292 rc->stop(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100293error_rc_start:
David Vrabela9e75a32009-08-25 15:07:12 +0100294 uwbd_stop(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100295 return result;
296}
297EXPORT_SYMBOL_GPL(uwb_rc_add);
298
299
300static int uwb_dev_offair_helper(struct device *dev, void *priv)
301{
302 struct uwb_dev *uwb_dev = to_uwb_dev(dev);
303
304 return __uwb_dev_offair(uwb_dev, uwb_dev->rc);
305}
306
307/*
308 * Remove a Radio Controller; stop beaconing/scanning, disconnect all children
309 */
310void uwb_rc_rm(struct uwb_rc *rc)
311{
312 rc->ready = 0;
313
314 uwb_dbg_del_rc(rc);
David Vrabel58be81ed2008-11-07 18:19:19 +0000315 uwb_rsv_remove_all(rc);
David Vrabel6fae35f2008-11-17 15:53:42 +0000316 uwb_radio_shutdown(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100317
318 rc->stop(rc);
Stefano Panellafec1a592008-11-04 15:39:08 +0000319
320 uwbd_stop(rc);
David Vrabel58be81ed2008-11-07 18:19:19 +0000321 uwb_rc_neh_destroy(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100322
323 uwb_dev_lock(&rc->uwb_dev);
324 rc->priv = NULL;
325 rc->cmd = NULL;
326 uwb_dev_unlock(&rc->uwb_dev);
Stefano Panellafec1a592008-11-04 15:39:08 +0000327 mutex_lock(&rc->uwb_beca.mutex);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100328 uwb_dev_for_each(rc, uwb_dev_offair_helper, NULL);
329 __uwb_rc_sys_rm(rc);
Stefano Panellafec1a592008-11-04 15:39:08 +0000330 mutex_unlock(&rc->uwb_beca.mutex);
David Vrabel58be81ed2008-11-07 18:19:19 +0000331 uwb_rsv_cleanup(rc);
Stefano Panellafec1a592008-11-04 15:39:08 +0000332 uwb_beca_release(rc);
Inaky Perez-Gonzalez183b9b52008-09-17 16:34:06 +0100333 uwb_dev_rm(&rc->uwb_dev);
334}
335EXPORT_SYMBOL_GPL(uwb_rc_rm);
336
337static int find_rc_try_get(struct device *dev, void *data)
338{
339 struct uwb_rc *target_rc = data;
340 struct uwb_rc *rc = dev_get_drvdata(dev);
341
342 if (rc == NULL) {
343 WARN_ON(1);
344 return 0;
345 }
346 if (rc == target_rc) {
347 if (rc->ready == 0)
348 return 0;
349 else
350 return 1;
351 }
352 return 0;
353}
354
355/**
356 * Given a radio controller descriptor, validate and refcount it
357 *
358 * @returns NULL if the rc does not exist or is quiescing; the ptr to
359 * it otherwise.
360 */
361struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *target_rc)
362{
363 struct device *dev;
364 struct uwb_rc *rc = NULL;
365
366 dev = class_find_device(&uwb_rc_class, NULL, target_rc,
367 find_rc_try_get);
368 if (dev) {
369 rc = dev_get_drvdata(dev);
370 __uwb_rc_get(rc);
371 }
372 return rc;
373}
374EXPORT_SYMBOL_GPL(__uwb_rc_try_get);
375
376/*
377 * RC get for external refcount acquirers...
378 *
379 * Increments the refcount of the device and it's backend modules
380 */
381static inline struct uwb_rc *uwb_rc_get(struct uwb_rc *rc)
382{
383 if (rc->ready == 0)
384 return NULL;
385 uwb_dev_get(&rc->uwb_dev);
386 return rc;
387}
388
389static int find_rc_grandpa(struct device *dev, void *data)
390{
391 struct device *grandpa_dev = data;
392 struct uwb_rc *rc = dev_get_drvdata(dev);
393
394 if (rc->uwb_dev.dev.parent->parent == grandpa_dev) {
395 rc = uwb_rc_get(rc);
396 return 1;
397 }
398 return 0;
399}
400
401/**
402 * Locate and refcount a radio controller given a common grand-parent
403 *
404 * @grandpa_dev Pointer to the 'grandparent' device structure.
405 * @returns NULL If the rc does not exist or is quiescing; the ptr to
406 * it otherwise, properly referenced.
407 *
408 * The Radio Control interface (or the UWB Radio Controller) is always
409 * an interface of a device. The parent is the interface, the
410 * grandparent is the device that encapsulates the interface.
411 *
412 * There is no need to lock around as the "grandpa" would be
413 * refcounted by the target, and to remove the referemes, the
414 * uwb_rc_class->sem would have to be taken--we hold it, ergo we
415 * should be safe.
416 */
417struct uwb_rc *uwb_rc_get_by_grandpa(const struct device *grandpa_dev)
418{
419 struct device *dev;
420 struct uwb_rc *rc = NULL;
421
422 dev = class_find_device(&uwb_rc_class, NULL, (void *)grandpa_dev,
423 find_rc_grandpa);
424 if (dev)
425 rc = dev_get_drvdata(dev);
426 return rc;
427}
428EXPORT_SYMBOL_GPL(uwb_rc_get_by_grandpa);
429
430/**
431 * Find a radio controller by device address
432 *
433 * @returns the pointer to the radio controller, properly referenced
434 */
435static int find_rc_dev(struct device *dev, void *data)
436{
437 struct uwb_dev_addr *addr = data;
438 struct uwb_rc *rc = dev_get_drvdata(dev);
439
440 if (rc == NULL) {
441 WARN_ON(1);
442 return 0;
443 }
444 if (!uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, addr)) {
445 rc = uwb_rc_get(rc);
446 return 1;
447 }
448 return 0;
449}
450
451struct uwb_rc *uwb_rc_get_by_dev(const struct uwb_dev_addr *addr)
452{
453 struct device *dev;
454 struct uwb_rc *rc = NULL;
455
456 dev = class_find_device(&uwb_rc_class, NULL, (void *)addr,
457 find_rc_dev);
458 if (dev)
459 rc = dev_get_drvdata(dev);
460
461 return rc;
462}
463EXPORT_SYMBOL_GPL(uwb_rc_get_by_dev);
464
465/**
466 * Drop a reference on a radio controller
467 *
468 * This is the version that should be done by entities external to the
469 * UWB Radio Control stack (ie: clients of the API).
470 */
471void uwb_rc_put(struct uwb_rc *rc)
472{
473 __uwb_rc_put(rc);
474}
475EXPORT_SYMBOL_GPL(uwb_rc_put);