Commit | Line | Data |
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4d12b8b1 LRV |
1 | /* |
2 | * Copyright (C) 2011 Instituto Nokia de Tecnologia | |
3 | * | |
4 | * Authors: | |
5 | * Lauro Ramos Venancio <lauro.venancio@openbossa.org> | |
6 | * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the | |
20 | * Free Software Foundation, Inc., | |
21 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | */ | |
23 | ||
52858b51 | 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
20c239c1 | 25 | |
4d12b8b1 LRV |
26 | #include <net/genetlink.h> |
27 | #include <linux/nfc.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include "nfc.h" | |
31 | ||
32 | static struct genl_multicast_group nfc_genl_event_mcgrp = { | |
33 | .name = NFC_GENL_MCAST_EVENT_NAME, | |
34 | }; | |
35 | ||
36 | struct genl_family nfc_genl_family = { | |
37 | .id = GENL_ID_GENERATE, | |
38 | .hdrsize = 0, | |
39 | .name = NFC_GENL_NAME, | |
40 | .version = NFC_GENL_VERSION, | |
41 | .maxattr = NFC_ATTR_MAX, | |
42 | }; | |
43 | ||
44 | static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = { | |
45 | [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 }, | |
46 | [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING, | |
47 | .len = NFC_DEVICE_NAME_MAXSIZE }, | |
48 | [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 }, | |
1ed28f61 SO |
49 | [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 }, |
50 | [NFC_ATTR_RF_MODE] = { .type = NLA_U8 }, | |
c970a1ac | 51 | [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 }, |
4d12b8b1 LRV |
52 | }; |
53 | ||
54 | static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target, | |
0a40acb2 | 55 | struct netlink_callback *cb, int flags) |
4d12b8b1 LRV |
56 | { |
57 | void *hdr; | |
58 | ||
4d12b8b1 | 59 | hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, |
0a40acb2 | 60 | &nfc_genl_family, flags, NFC_CMD_GET_TARGET); |
4d12b8b1 LRV |
61 | if (!hdr) |
62 | return -EMSGSIZE; | |
63 | ||
64 | genl_dump_check_consistent(cb, hdr, &nfc_genl_family); | |
65 | ||
1e6428d8 DM |
66 | if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) || |
67 | nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) || | |
68 | nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) || | |
69 | nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res)) | |
70 | goto nla_put_failure; | |
71 | if (target->nfcid1_len > 0 && | |
72 | nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len, | |
73 | target->nfcid1)) | |
74 | goto nla_put_failure; | |
75 | if (target->sensb_res_len > 0 && | |
76 | nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len, | |
77 | target->sensb_res)) | |
78 | goto nla_put_failure; | |
79 | if (target->sensf_res_len > 0 && | |
80 | nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len, | |
81 | target->sensf_res)) | |
82 | goto nla_put_failure; | |
4d12b8b1 LRV |
83 | |
84 | return genlmsg_end(msg, hdr); | |
85 | ||
86 | nla_put_failure: | |
87 | genlmsg_cancel(msg, hdr); | |
88 | return -EMSGSIZE; | |
89 | } | |
90 | ||
91 | static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb) | |
92 | { | |
93 | struct nfc_dev *dev; | |
94 | int rc; | |
95 | u32 idx; | |
96 | ||
97 | rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize, | |
0a40acb2 SO |
98 | nfc_genl_family.attrbuf, |
99 | nfc_genl_family.maxattr, | |
100 | nfc_genl_policy); | |
4d12b8b1 LRV |
101 | if (rc < 0) |
102 | return ERR_PTR(rc); | |
103 | ||
104 | if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]) | |
105 | return ERR_PTR(-EINVAL); | |
106 | ||
107 | idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]); | |
108 | ||
109 | dev = nfc_get_device(idx); | |
110 | if (!dev) | |
111 | return ERR_PTR(-ENODEV); | |
112 | ||
113 | return dev; | |
114 | } | |
115 | ||
116 | static int nfc_genl_dump_targets(struct sk_buff *skb, | |
0a40acb2 | 117 | struct netlink_callback *cb) |
4d12b8b1 LRV |
118 | { |
119 | int i = cb->args[0]; | |
120 | struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; | |
121 | int rc; | |
122 | ||
4d12b8b1 LRV |
123 | if (!dev) { |
124 | dev = __get_device_from_cb(cb); | |
125 | if (IS_ERR(dev)) | |
126 | return PTR_ERR(dev); | |
127 | ||
128 | cb->args[1] = (long) dev; | |
129 | } | |
130 | ||
131 | spin_lock_bh(&dev->targets_lock); | |
132 | ||
133 | cb->seq = dev->targets_generation; | |
134 | ||
135 | while (i < dev->n_targets) { | |
136 | rc = nfc_genl_send_target(skb, &dev->targets[i], cb, | |
0a40acb2 | 137 | NLM_F_MULTI); |
4d12b8b1 LRV |
138 | if (rc < 0) |
139 | break; | |
140 | ||
141 | i++; | |
142 | } | |
143 | ||
144 | spin_unlock_bh(&dev->targets_lock); | |
145 | ||
146 | cb->args[0] = i; | |
147 | ||
148 | return skb->len; | |
149 | } | |
150 | ||
151 | static int nfc_genl_dump_targets_done(struct netlink_callback *cb) | |
152 | { | |
153 | struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; | |
154 | ||
4d12b8b1 LRV |
155 | if (dev) |
156 | nfc_put_device(dev); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | int nfc_genl_targets_found(struct nfc_dev *dev) | |
162 | { | |
163 | struct sk_buff *msg; | |
164 | void *hdr; | |
165 | ||
4d12b8b1 LRV |
166 | dev->genl_data.poll_req_pid = 0; |
167 | ||
168 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
169 | if (!msg) | |
170 | return -ENOMEM; | |
171 | ||
172 | hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, | |
0a40acb2 | 173 | NFC_EVENT_TARGETS_FOUND); |
4d12b8b1 LRV |
174 | if (!hdr) |
175 | goto free_msg; | |
176 | ||
1e6428d8 DM |
177 | if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) |
178 | goto nla_put_failure; | |
4d12b8b1 LRV |
179 | |
180 | genlmsg_end(msg, hdr); | |
181 | ||
182 | return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); | |
183 | ||
184 | nla_put_failure: | |
185 | genlmsg_cancel(msg, hdr); | |
186 | free_msg: | |
187 | nlmsg_free(msg); | |
188 | return -EMSGSIZE; | |
189 | } | |
190 | ||
191 | int nfc_genl_device_added(struct nfc_dev *dev) | |
192 | { | |
193 | struct sk_buff *msg; | |
194 | void *hdr; | |
195 | ||
4d12b8b1 LRV |
196 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
197 | if (!msg) | |
198 | return -ENOMEM; | |
199 | ||
200 | hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, | |
0a40acb2 | 201 | NFC_EVENT_DEVICE_ADDED); |
4d12b8b1 LRV |
202 | if (!hdr) |
203 | goto free_msg; | |
204 | ||
1e6428d8 DM |
205 | if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || |
206 | nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || | |
207 | nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) || | |
208 | nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up)) | |
209 | goto nla_put_failure; | |
4d12b8b1 LRV |
210 | |
211 | genlmsg_end(msg, hdr); | |
212 | ||
213 | genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); | |
214 | ||
215 | return 0; | |
216 | ||
217 | nla_put_failure: | |
218 | genlmsg_cancel(msg, hdr); | |
219 | free_msg: | |
220 | nlmsg_free(msg); | |
221 | return -EMSGSIZE; | |
222 | } | |
223 | ||
224 | int nfc_genl_device_removed(struct nfc_dev *dev) | |
225 | { | |
226 | struct sk_buff *msg; | |
227 | void *hdr; | |
228 | ||
4d12b8b1 LRV |
229 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
230 | if (!msg) | |
231 | return -ENOMEM; | |
232 | ||
233 | hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, | |
0a40acb2 | 234 | NFC_EVENT_DEVICE_REMOVED); |
4d12b8b1 LRV |
235 | if (!hdr) |
236 | goto free_msg; | |
237 | ||
1e6428d8 DM |
238 | if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) |
239 | goto nla_put_failure; | |
4d12b8b1 LRV |
240 | |
241 | genlmsg_end(msg, hdr); | |
242 | ||
243 | genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL); | |
244 | ||
245 | return 0; | |
246 | ||
247 | nla_put_failure: | |
248 | genlmsg_cancel(msg, hdr); | |
249 | free_msg: | |
250 | nlmsg_free(msg); | |
251 | return -EMSGSIZE; | |
252 | } | |
253 | ||
254 | static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev, | |
0a40acb2 SO |
255 | u32 pid, u32 seq, |
256 | struct netlink_callback *cb, | |
257 | int flags) | |
4d12b8b1 LRV |
258 | { |
259 | void *hdr; | |
260 | ||
4d12b8b1 | 261 | hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags, |
0a40acb2 | 262 | NFC_CMD_GET_DEVICE); |
4d12b8b1 LRV |
263 | if (!hdr) |
264 | return -EMSGSIZE; | |
265 | ||
266 | if (cb) | |
267 | genl_dump_check_consistent(cb, hdr, &nfc_genl_family); | |
268 | ||
1e6428d8 DM |
269 | if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) || |
270 | nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) || | |
271 | nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) || | |
272 | nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up)) | |
273 | goto nla_put_failure; | |
4d12b8b1 LRV |
274 | |
275 | return genlmsg_end(msg, hdr); | |
276 | ||
277 | nla_put_failure: | |
278 | genlmsg_cancel(msg, hdr); | |
279 | return -EMSGSIZE; | |
280 | } | |
281 | ||
282 | static int nfc_genl_dump_devices(struct sk_buff *skb, | |
0a40acb2 | 283 | struct netlink_callback *cb) |
4d12b8b1 LRV |
284 | { |
285 | struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; | |
286 | struct nfc_dev *dev = (struct nfc_dev *) cb->args[1]; | |
287 | bool first_call = false; | |
288 | ||
4d12b8b1 LRV |
289 | if (!iter) { |
290 | first_call = true; | |
291 | iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL); | |
292 | if (!iter) | |
293 | return -ENOMEM; | |
294 | cb->args[0] = (long) iter; | |
295 | } | |
296 | ||
297 | mutex_lock(&nfc_devlist_mutex); | |
298 | ||
299 | cb->seq = nfc_devlist_generation; | |
300 | ||
301 | if (first_call) { | |
302 | nfc_device_iter_init(iter); | |
303 | dev = nfc_device_iter_next(iter); | |
304 | } | |
305 | ||
306 | while (dev) { | |
307 | int rc; | |
308 | ||
309 | rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid, | |
0a40acb2 | 310 | cb->nlh->nlmsg_seq, cb, NLM_F_MULTI); |
4d12b8b1 LRV |
311 | if (rc < 0) |
312 | break; | |
313 | ||
314 | dev = nfc_device_iter_next(iter); | |
315 | } | |
316 | ||
317 | mutex_unlock(&nfc_devlist_mutex); | |
318 | ||
319 | cb->args[1] = (long) dev; | |
320 | ||
321 | return skb->len; | |
322 | } | |
323 | ||
324 | static int nfc_genl_dump_devices_done(struct netlink_callback *cb) | |
325 | { | |
326 | struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0]; | |
327 | ||
4d12b8b1 LRV |
328 | nfc_device_iter_exit(iter); |
329 | kfree(iter); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
1ed28f61 | 334 | int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx, |
0a40acb2 | 335 | u8 comm_mode, u8 rf_mode) |
1ed28f61 SO |
336 | { |
337 | struct sk_buff *msg; | |
338 | void *hdr; | |
339 | ||
340 | pr_debug("DEP link is up\n"); | |
341 | ||
342 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
343 | if (!msg) | |
344 | return -ENOMEM; | |
345 | ||
0a40acb2 | 346 | hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP); |
1ed28f61 SO |
347 | if (!hdr) |
348 | goto free_msg; | |
349 | ||
1e6428d8 DM |
350 | if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) |
351 | goto nla_put_failure; | |
352 | if (rf_mode == NFC_RF_INITIATOR && | |
353 | nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx)) | |
354 | goto nla_put_failure; | |
355 | if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) || | |
356 | nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode)) | |
357 | goto nla_put_failure; | |
1ed28f61 SO |
358 | |
359 | genlmsg_end(msg, hdr); | |
360 | ||
361 | dev->dep_link_up = true; | |
362 | ||
363 | genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); | |
364 | ||
365 | return 0; | |
366 | ||
367 | nla_put_failure: | |
368 | genlmsg_cancel(msg, hdr); | |
369 | free_msg: | |
370 | nlmsg_free(msg); | |
371 | return -EMSGSIZE; | |
372 | } | |
373 | ||
374 | int nfc_genl_dep_link_down_event(struct nfc_dev *dev) | |
375 | { | |
376 | struct sk_buff *msg; | |
377 | void *hdr; | |
378 | ||
379 | pr_debug("DEP link is down\n"); | |
380 | ||
381 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); | |
382 | if (!msg) | |
383 | return -ENOMEM; | |
384 | ||
385 | hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, | |
0a40acb2 | 386 | NFC_CMD_DEP_LINK_DOWN); |
1ed28f61 SO |
387 | if (!hdr) |
388 | goto free_msg; | |
389 | ||
1e6428d8 DM |
390 | if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx)) |
391 | goto nla_put_failure; | |
1ed28f61 SO |
392 | |
393 | genlmsg_end(msg, hdr); | |
394 | ||
395 | genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC); | |
396 | ||
397 | return 0; | |
398 | ||
399 | nla_put_failure: | |
400 | genlmsg_cancel(msg, hdr); | |
401 | free_msg: | |
402 | nlmsg_free(msg); | |
403 | return -EMSGSIZE; | |
404 | } | |
405 | ||
4d12b8b1 LRV |
406 | static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info) |
407 | { | |
408 | struct sk_buff *msg; | |
409 | struct nfc_dev *dev; | |
410 | u32 idx; | |
411 | int rc = -ENOBUFS; | |
412 | ||
4d12b8b1 LRV |
413 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) |
414 | return -EINVAL; | |
415 | ||
416 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
417 | ||
418 | dev = nfc_get_device(idx); | |
419 | if (!dev) | |
420 | return -ENODEV; | |
421 | ||
422 | msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); | |
423 | if (!msg) { | |
424 | rc = -ENOMEM; | |
425 | goto out_putdev; | |
426 | } | |
427 | ||
428 | rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq, | |
0a40acb2 | 429 | NULL, 0); |
4d12b8b1 LRV |
430 | if (rc < 0) |
431 | goto out_free; | |
432 | ||
433 | nfc_put_device(dev); | |
434 | ||
435 | return genlmsg_reply(msg, info); | |
436 | ||
437 | out_free: | |
438 | nlmsg_free(msg); | |
439 | out_putdev: | |
440 | nfc_put_device(dev); | |
441 | return rc; | |
442 | } | |
443 | ||
8b3fe7b5 IE |
444 | static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info) |
445 | { | |
446 | struct nfc_dev *dev; | |
447 | int rc; | |
448 | u32 idx; | |
449 | ||
8b3fe7b5 IE |
450 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) |
451 | return -EINVAL; | |
452 | ||
453 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
454 | ||
455 | dev = nfc_get_device(idx); | |
456 | if (!dev) | |
457 | return -ENODEV; | |
458 | ||
459 | rc = nfc_dev_up(dev); | |
460 | ||
461 | nfc_put_device(dev); | |
462 | return rc; | |
463 | } | |
464 | ||
465 | static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info) | |
466 | { | |
467 | struct nfc_dev *dev; | |
468 | int rc; | |
469 | u32 idx; | |
470 | ||
8b3fe7b5 IE |
471 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) |
472 | return -EINVAL; | |
473 | ||
474 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
475 | ||
476 | dev = nfc_get_device(idx); | |
477 | if (!dev) | |
478 | return -ENODEV; | |
479 | ||
480 | rc = nfc_dev_down(dev); | |
481 | ||
482 | nfc_put_device(dev); | |
483 | return rc; | |
484 | } | |
485 | ||
4d12b8b1 LRV |
486 | static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info) |
487 | { | |
488 | struct nfc_dev *dev; | |
489 | int rc; | |
490 | u32 idx; | |
491 | u32 protocols; | |
492 | ||
1ed28f61 SO |
493 | pr_debug("Poll start\n"); |
494 | ||
4d12b8b1 | 495 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || |
0a40acb2 | 496 | !info->attrs[NFC_ATTR_PROTOCOLS]) |
4d12b8b1 LRV |
497 | return -EINVAL; |
498 | ||
499 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
500 | protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]); | |
501 | ||
502 | dev = nfc_get_device(idx); | |
503 | if (!dev) | |
504 | return -ENODEV; | |
505 | ||
506 | mutex_lock(&dev->genl_data.genl_data_mutex); | |
507 | ||
508 | rc = nfc_start_poll(dev, protocols); | |
509 | if (!rc) | |
510 | dev->genl_data.poll_req_pid = info->snd_pid; | |
511 | ||
512 | mutex_unlock(&dev->genl_data.genl_data_mutex); | |
513 | ||
514 | nfc_put_device(dev); | |
515 | return rc; | |
516 | } | |
517 | ||
518 | static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info) | |
519 | { | |
520 | struct nfc_dev *dev; | |
521 | int rc; | |
522 | u32 idx; | |
523 | ||
4d12b8b1 LRV |
524 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) |
525 | return -EINVAL; | |
526 | ||
527 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
528 | ||
529 | dev = nfc_get_device(idx); | |
530 | if (!dev) | |
531 | return -ENODEV; | |
532 | ||
533 | mutex_lock(&dev->genl_data.genl_data_mutex); | |
534 | ||
535 | if (dev->genl_data.poll_req_pid != info->snd_pid) { | |
536 | rc = -EBUSY; | |
537 | goto out; | |
538 | } | |
539 | ||
540 | rc = nfc_stop_poll(dev); | |
541 | dev->genl_data.poll_req_pid = 0; | |
542 | ||
543 | out: | |
544 | mutex_unlock(&dev->genl_data.genl_data_mutex); | |
545 | nfc_put_device(dev); | |
546 | return rc; | |
547 | } | |
548 | ||
1ed28f61 SO |
549 | static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info) |
550 | { | |
551 | struct nfc_dev *dev; | |
552 | int rc, tgt_idx; | |
553 | u32 idx; | |
47807d3d | 554 | u8 comm; |
1ed28f61 SO |
555 | |
556 | pr_debug("DEP link up\n"); | |
557 | ||
558 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || | |
47807d3d | 559 | !info->attrs[NFC_ATTR_COMM_MODE]) |
1ed28f61 SO |
560 | return -EINVAL; |
561 | ||
562 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
563 | if (!info->attrs[NFC_ATTR_TARGET_INDEX]) | |
564 | tgt_idx = NFC_TARGET_IDX_ANY; | |
565 | else | |
566 | tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]); | |
567 | ||
568 | comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]); | |
1ed28f61 SO |
569 | |
570 | if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE) | |
571 | return -EINVAL; | |
572 | ||
1ed28f61 SO |
573 | dev = nfc_get_device(idx); |
574 | if (!dev) | |
575 | return -ENODEV; | |
576 | ||
47807d3d | 577 | rc = nfc_dep_link_up(dev, tgt_idx, comm); |
1ed28f61 SO |
578 | |
579 | nfc_put_device(dev); | |
580 | ||
581 | return rc; | |
582 | } | |
583 | ||
584 | static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info) | |
585 | { | |
586 | struct nfc_dev *dev; | |
587 | int rc; | |
588 | u32 idx; | |
589 | ||
590 | if (!info->attrs[NFC_ATTR_DEVICE_INDEX]) | |
591 | return -EINVAL; | |
592 | ||
593 | idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); | |
594 | ||
595 | dev = nfc_get_device(idx); | |
596 | if (!dev) | |
597 | return -ENODEV; | |
598 | ||
599 | rc = nfc_dep_link_down(dev); | |
600 | ||
601 | nfc_put_device(dev); | |
602 | return rc; | |
603 | } | |
604 | ||
4d12b8b1 LRV |
605 | static struct genl_ops nfc_genl_ops[] = { |
606 | { | |
607 | .cmd = NFC_CMD_GET_DEVICE, | |
608 | .doit = nfc_genl_get_device, | |
609 | .dumpit = nfc_genl_dump_devices, | |
610 | .done = nfc_genl_dump_devices_done, | |
611 | .policy = nfc_genl_policy, | |
8b3fe7b5 IE |
612 | }, |
613 | { | |
614 | .cmd = NFC_CMD_DEV_UP, | |
615 | .doit = nfc_genl_dev_up, | |
616 | .policy = nfc_genl_policy, | |
617 | }, | |
618 | { | |
619 | .cmd = NFC_CMD_DEV_DOWN, | |
620 | .doit = nfc_genl_dev_down, | |
621 | .policy = nfc_genl_policy, | |
4d12b8b1 LRV |
622 | }, |
623 | { | |
624 | .cmd = NFC_CMD_START_POLL, | |
625 | .doit = nfc_genl_start_poll, | |
626 | .policy = nfc_genl_policy, | |
627 | }, | |
628 | { | |
629 | .cmd = NFC_CMD_STOP_POLL, | |
630 | .doit = nfc_genl_stop_poll, | |
631 | .policy = nfc_genl_policy, | |
632 | }, | |
1ed28f61 SO |
633 | { |
634 | .cmd = NFC_CMD_DEP_LINK_UP, | |
635 | .doit = nfc_genl_dep_link_up, | |
636 | .policy = nfc_genl_policy, | |
637 | }, | |
638 | { | |
639 | .cmd = NFC_CMD_DEP_LINK_DOWN, | |
640 | .doit = nfc_genl_dep_link_down, | |
641 | .policy = nfc_genl_policy, | |
642 | }, | |
4d12b8b1 LRV |
643 | { |
644 | .cmd = NFC_CMD_GET_TARGET, | |
645 | .dumpit = nfc_genl_dump_targets, | |
646 | .done = nfc_genl_dump_targets_done, | |
647 | .policy = nfc_genl_policy, | |
648 | }, | |
649 | }; | |
650 | ||
651 | static int nfc_genl_rcv_nl_event(struct notifier_block *this, | |
0a40acb2 | 652 | unsigned long event, void *ptr) |
4d12b8b1 LRV |
653 | { |
654 | struct netlink_notify *n = ptr; | |
655 | struct class_dev_iter iter; | |
656 | struct nfc_dev *dev; | |
657 | ||
658 | if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC) | |
659 | goto out; | |
660 | ||
20c239c1 | 661 | pr_debug("NETLINK_URELEASE event from id %d\n", n->pid); |
4d12b8b1 LRV |
662 | |
663 | nfc_device_iter_init(&iter); | |
664 | dev = nfc_device_iter_next(&iter); | |
665 | ||
666 | while (dev) { | |
4d12b8b1 LRV |
667 | if (dev->genl_data.poll_req_pid == n->pid) { |
668 | nfc_stop_poll(dev); | |
669 | dev->genl_data.poll_req_pid = 0; | |
670 | } | |
4d12b8b1 LRV |
671 | dev = nfc_device_iter_next(&iter); |
672 | } | |
673 | ||
674 | nfc_device_iter_exit(&iter); | |
675 | ||
676 | out: | |
677 | return NOTIFY_DONE; | |
678 | } | |
679 | ||
680 | void nfc_genl_data_init(struct nfc_genl_data *genl_data) | |
681 | { | |
682 | genl_data->poll_req_pid = 0; | |
683 | mutex_init(&genl_data->genl_data_mutex); | |
684 | } | |
685 | ||
686 | void nfc_genl_data_exit(struct nfc_genl_data *genl_data) | |
687 | { | |
688 | mutex_destroy(&genl_data->genl_data_mutex); | |
689 | } | |
690 | ||
691 | static struct notifier_block nl_notifier = { | |
692 | .notifier_call = nfc_genl_rcv_nl_event, | |
693 | }; | |
694 | ||
695 | /** | |
696 | * nfc_genl_init() - Initialize netlink interface | |
697 | * | |
698 | * This initialization function registers the nfc netlink family. | |
699 | */ | |
700 | int __init nfc_genl_init(void) | |
701 | { | |
702 | int rc; | |
703 | ||
704 | rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops, | |
0a40acb2 | 705 | ARRAY_SIZE(nfc_genl_ops)); |
4d12b8b1 LRV |
706 | if (rc) |
707 | return rc; | |
708 | ||
709 | rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp); | |
710 | ||
711 | netlink_register_notifier(&nl_notifier); | |
712 | ||
713 | return rc; | |
714 | } | |
715 | ||
716 | /** | |
717 | * nfc_genl_exit() - Deinitialize netlink interface | |
718 | * | |
719 | * This exit function unregisters the nfc netlink family. | |
720 | */ | |
721 | void nfc_genl_exit(void) | |
722 | { | |
723 | netlink_unregister_notifier(&nl_notifier); | |
724 | genl_unregister_family(&nfc_genl_family); | |
725 | } |