2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
5 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
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.
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.
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.
24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
26 #include <net/genetlink.h>
27 #include <linux/nfc.h>
28 #include <linux/slab.h>
32 static struct genl_multicast_group nfc_genl_event_mcgrp = {
33 .name = NFC_GENL_MCAST_EVENT_NAME,
36 struct genl_family nfc_genl_family = {
37 .id = GENL_ID_GENERATE,
39 .name = NFC_GENL_NAME,
40 .version = NFC_GENL_VERSION,
41 .maxattr = NFC_ATTR_MAX,
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 },
49 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
50 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
51 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
54 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
55 struct netlink_callback *cb, int flags)
59 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
60 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
64 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
66 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
67 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
68 target->supported_protocols);
69 NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
70 NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
71 if (target->nfcid1_len > 0)
72 NLA_PUT(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
74 if (target->sensb_res_len > 0)
75 NLA_PUT(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
77 if (target->sensf_res_len > 0)
78 NLA_PUT(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
81 return genlmsg_end(msg, hdr);
84 genlmsg_cancel(msg, hdr);
88 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
94 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
95 nfc_genl_family.attrbuf,
96 nfc_genl_family.maxattr,
101 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
102 return ERR_PTR(-EINVAL);
104 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
106 dev = nfc_get_device(idx);
108 return ERR_PTR(-ENODEV);
113 static int nfc_genl_dump_targets(struct sk_buff *skb,
114 struct netlink_callback *cb)
117 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
121 dev = __get_device_from_cb(cb);
125 cb->args[1] = (long) dev;
128 spin_lock_bh(&dev->targets_lock);
130 cb->seq = dev->targets_generation;
132 while (i < dev->n_targets) {
133 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
141 spin_unlock_bh(&dev->targets_lock);
148 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
150 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
158 int nfc_genl_targets_found(struct nfc_dev *dev)
163 dev->genl_data.poll_req_pid = 0;
165 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
169 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
170 NFC_EVENT_TARGETS_FOUND);
174 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
176 genlmsg_end(msg, hdr);
178 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
181 genlmsg_cancel(msg, hdr);
187 int nfc_genl_device_added(struct nfc_dev *dev)
192 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
196 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
197 NFC_EVENT_DEVICE_ADDED);
201 NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
202 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
203 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
204 NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);
206 genlmsg_end(msg, hdr);
208 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
213 genlmsg_cancel(msg, hdr);
219 int nfc_genl_device_removed(struct nfc_dev *dev)
224 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
228 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
229 NFC_EVENT_DEVICE_REMOVED);
233 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
235 genlmsg_end(msg, hdr);
237 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
242 genlmsg_cancel(msg, hdr);
248 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
250 struct netlink_callback *cb,
255 hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
261 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
263 NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
264 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
265 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
266 NLA_PUT_U8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up);
268 return genlmsg_end(msg, hdr);
271 genlmsg_cancel(msg, hdr);
275 static int nfc_genl_dump_devices(struct sk_buff *skb,
276 struct netlink_callback *cb)
278 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
279 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
280 bool first_call = false;
284 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
287 cb->args[0] = (long) iter;
290 mutex_lock(&nfc_devlist_mutex);
292 cb->seq = nfc_devlist_generation;
295 nfc_device_iter_init(iter);
296 dev = nfc_device_iter_next(iter);
302 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
308 dev = nfc_device_iter_next(iter);
311 mutex_unlock(&nfc_devlist_mutex);
313 cb->args[1] = (long) dev;
318 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
320 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
322 nfc_device_iter_exit(iter);
328 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
329 u8 comm_mode, u8 rf_mode)
334 pr_debug("DEP link is up\n");
336 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
340 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
341 NFC_CMD_DEP_LINK_UP);
345 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
346 if (rf_mode == NFC_RF_INITIATOR)
347 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target_idx);
348 NLA_PUT_U8(msg, NFC_ATTR_COMM_MODE, comm_mode);
349 NLA_PUT_U8(msg, NFC_ATTR_RF_MODE, rf_mode);
351 genlmsg_end(msg, hdr);
353 dev->dep_link_up = true;
355 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
360 genlmsg_cancel(msg, hdr);
366 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
371 pr_debug("DEP link is down\n");
373 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
377 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
378 NFC_CMD_DEP_LINK_DOWN);
382 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
384 genlmsg_end(msg, hdr);
386 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
391 genlmsg_cancel(msg, hdr);
397 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
404 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
407 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
409 dev = nfc_get_device(idx);
413 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
419 rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
426 return genlmsg_reply(msg, info);
435 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
441 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
444 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
446 dev = nfc_get_device(idx);
450 rc = nfc_dev_up(dev);
456 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
462 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
465 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
467 dev = nfc_get_device(idx);
471 rc = nfc_dev_down(dev);
477 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
484 pr_debug("Poll start\n");
486 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
487 !info->attrs[NFC_ATTR_PROTOCOLS])
490 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
491 protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
493 dev = nfc_get_device(idx);
497 mutex_lock(&dev->genl_data.genl_data_mutex);
499 rc = nfc_start_poll(dev, protocols);
501 dev->genl_data.poll_req_pid = info->snd_pid;
503 mutex_unlock(&dev->genl_data.genl_data_mutex);
509 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
515 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
518 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
520 dev = nfc_get_device(idx);
524 mutex_lock(&dev->genl_data.genl_data_mutex);
526 if (dev->genl_data.poll_req_pid != info->snd_pid) {
531 rc = nfc_stop_poll(dev);
532 dev->genl_data.poll_req_pid = 0;
535 mutex_unlock(&dev->genl_data.genl_data_mutex);
540 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
547 pr_debug("DEP link up\n");
549 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
550 !info->attrs[NFC_ATTR_COMM_MODE])
553 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
554 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
555 tgt_idx = NFC_TARGET_IDX_ANY;
557 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
559 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
561 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
564 dev = nfc_get_device(idx);
568 rc = nfc_dep_link_up(dev, tgt_idx, comm);
575 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
581 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
584 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
586 dev = nfc_get_device(idx);
590 rc = nfc_dep_link_down(dev);
596 static struct genl_ops nfc_genl_ops[] = {
598 .cmd = NFC_CMD_GET_DEVICE,
599 .doit = nfc_genl_get_device,
600 .dumpit = nfc_genl_dump_devices,
601 .done = nfc_genl_dump_devices_done,
602 .policy = nfc_genl_policy,
605 .cmd = NFC_CMD_DEV_UP,
606 .doit = nfc_genl_dev_up,
607 .policy = nfc_genl_policy,
610 .cmd = NFC_CMD_DEV_DOWN,
611 .doit = nfc_genl_dev_down,
612 .policy = nfc_genl_policy,
615 .cmd = NFC_CMD_START_POLL,
616 .doit = nfc_genl_start_poll,
617 .policy = nfc_genl_policy,
620 .cmd = NFC_CMD_STOP_POLL,
621 .doit = nfc_genl_stop_poll,
622 .policy = nfc_genl_policy,
625 .cmd = NFC_CMD_DEP_LINK_UP,
626 .doit = nfc_genl_dep_link_up,
627 .policy = nfc_genl_policy,
630 .cmd = NFC_CMD_DEP_LINK_DOWN,
631 .doit = nfc_genl_dep_link_down,
632 .policy = nfc_genl_policy,
635 .cmd = NFC_CMD_GET_TARGET,
636 .dumpit = nfc_genl_dump_targets,
637 .done = nfc_genl_dump_targets_done,
638 .policy = nfc_genl_policy,
642 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
643 unsigned long event, void *ptr)
645 struct netlink_notify *n = ptr;
646 struct class_dev_iter iter;
649 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
652 pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
654 nfc_device_iter_init(&iter);
655 dev = nfc_device_iter_next(&iter);
658 if (dev->genl_data.poll_req_pid == n->pid) {
660 dev->genl_data.poll_req_pid = 0;
662 dev = nfc_device_iter_next(&iter);
665 nfc_device_iter_exit(&iter);
671 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
673 genl_data->poll_req_pid = 0;
674 mutex_init(&genl_data->genl_data_mutex);
677 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
679 mutex_destroy(&genl_data->genl_data_mutex);
682 static struct notifier_block nl_notifier = {
683 .notifier_call = nfc_genl_rcv_nl_event,
687 * nfc_genl_init() - Initialize netlink interface
689 * This initialization function registers the nfc netlink family.
691 int __init nfc_genl_init(void)
695 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
696 ARRAY_SIZE(nfc_genl_ops));
700 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
702 netlink_register_notifier(&nl_notifier);
708 * nfc_genl_exit() - Deinitialize netlink interface
710 * This exit function unregisters the nfc netlink family.
712 void nfc_genl_exit(void)
714 netlink_unregister_notifier(&nl_notifier);
715 genl_unregister_family(&nfc_genl_family);