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 static 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 },
52 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
53 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
56 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
57 struct netlink_callback *cb, int flags)
61 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
62 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
66 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
68 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
69 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
70 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
71 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
73 if (target->nfcid1_len > 0 &&
74 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
77 if (target->sensb_res_len > 0 &&
78 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
81 if (target->sensf_res_len > 0 &&
82 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
86 return genlmsg_end(msg, hdr);
89 genlmsg_cancel(msg, hdr);
93 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
99 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
100 nfc_genl_family.attrbuf,
101 nfc_genl_family.maxattr,
106 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
107 return ERR_PTR(-EINVAL);
109 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
111 dev = nfc_get_device(idx);
113 return ERR_PTR(-ENODEV);
118 static int nfc_genl_dump_targets(struct sk_buff *skb,
119 struct netlink_callback *cb)
122 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
126 dev = __get_device_from_cb(cb);
130 cb->args[1] = (long) dev;
133 device_lock(&dev->dev);
135 cb->seq = dev->targets_generation;
137 while (i < dev->n_targets) {
138 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
146 device_unlock(&dev->dev);
153 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
155 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
163 int nfc_genl_targets_found(struct nfc_dev *dev)
168 dev->genl_data.poll_req_portid = 0;
170 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
174 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
175 NFC_EVENT_TARGETS_FOUND);
179 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
180 goto nla_put_failure;
182 genlmsg_end(msg, hdr);
184 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
187 genlmsg_cancel(msg, hdr);
193 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
198 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
202 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
203 NFC_EVENT_TARGET_LOST);
207 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
208 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
209 goto nla_put_failure;
211 genlmsg_end(msg, hdr);
213 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
218 genlmsg_cancel(msg, hdr);
224 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
229 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
233 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
234 NFC_EVENT_TM_ACTIVATED);
238 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
239 goto nla_put_failure;
240 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
241 goto nla_put_failure;
243 genlmsg_end(msg, hdr);
245 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
250 genlmsg_cancel(msg, hdr);
256 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
261 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
265 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
266 NFC_EVENT_TM_DEACTIVATED);
270 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
271 goto nla_put_failure;
273 genlmsg_end(msg, hdr);
275 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
280 genlmsg_cancel(msg, hdr);
286 int nfc_genl_device_added(struct nfc_dev *dev)
291 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
295 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
296 NFC_EVENT_DEVICE_ADDED);
300 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
301 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
302 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
303 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
304 goto nla_put_failure;
306 genlmsg_end(msg, hdr);
308 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
313 genlmsg_cancel(msg, hdr);
319 int nfc_genl_device_removed(struct nfc_dev *dev)
324 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
328 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
329 NFC_EVENT_DEVICE_REMOVED);
333 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
334 goto nla_put_failure;
336 genlmsg_end(msg, hdr);
338 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
343 genlmsg_cancel(msg, hdr);
349 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
351 struct netlink_callback *cb,
356 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
362 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
364 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
365 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
366 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
367 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
368 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
369 goto nla_put_failure;
371 return genlmsg_end(msg, hdr);
374 genlmsg_cancel(msg, hdr);
378 static int nfc_genl_dump_devices(struct sk_buff *skb,
379 struct netlink_callback *cb)
381 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
382 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
383 bool first_call = false;
387 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
390 cb->args[0] = (long) iter;
393 mutex_lock(&nfc_devlist_mutex);
395 cb->seq = nfc_devlist_generation;
398 nfc_device_iter_init(iter);
399 dev = nfc_device_iter_next(iter);
405 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
406 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
410 dev = nfc_device_iter_next(iter);
413 mutex_unlock(&nfc_devlist_mutex);
415 cb->args[1] = (long) dev;
420 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
422 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
424 nfc_device_iter_exit(iter);
430 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
431 u8 comm_mode, u8 rf_mode)
436 pr_debug("DEP link is up\n");
438 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
442 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
446 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
447 goto nla_put_failure;
448 if (rf_mode == NFC_RF_INITIATOR &&
449 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
450 goto nla_put_failure;
451 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
452 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
453 goto nla_put_failure;
455 genlmsg_end(msg, hdr);
457 dev->dep_link_up = true;
459 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
464 genlmsg_cancel(msg, hdr);
470 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
475 pr_debug("DEP link is down\n");
477 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
481 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
482 NFC_CMD_DEP_LINK_DOWN);
486 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
487 goto nla_put_failure;
489 genlmsg_end(msg, hdr);
491 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
496 genlmsg_cancel(msg, hdr);
502 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
509 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
512 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
514 dev = nfc_get_device(idx);
518 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
524 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
531 return genlmsg_reply(msg, info);
540 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
546 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
549 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
551 dev = nfc_get_device(idx);
555 rc = nfc_dev_up(dev);
561 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
567 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
570 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
572 dev = nfc_get_device(idx);
576 rc = nfc_dev_down(dev);
582 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
587 u32 im_protocols = 0, tm_protocols = 0;
589 pr_debug("Poll start\n");
591 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
592 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
593 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
594 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
597 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
599 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
600 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
602 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
603 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
604 else if (info->attrs[NFC_ATTR_PROTOCOLS])
605 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
607 dev = nfc_get_device(idx);
611 mutex_lock(&dev->genl_data.genl_data_mutex);
613 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
615 dev->genl_data.poll_req_portid = info->snd_portid;
617 mutex_unlock(&dev->genl_data.genl_data_mutex);
623 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
629 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
632 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
634 dev = nfc_get_device(idx);
638 device_lock(&dev->dev);
641 device_unlock(&dev->dev);
645 device_unlock(&dev->dev);
647 mutex_lock(&dev->genl_data.genl_data_mutex);
649 if (dev->genl_data.poll_req_portid != info->snd_portid) {
654 rc = nfc_stop_poll(dev);
655 dev->genl_data.poll_req_portid = 0;
658 mutex_unlock(&dev->genl_data.genl_data_mutex);
663 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
670 pr_debug("DEP link up\n");
672 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
673 !info->attrs[NFC_ATTR_COMM_MODE])
676 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
677 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
678 tgt_idx = NFC_TARGET_IDX_ANY;
680 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
682 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
684 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
687 dev = nfc_get_device(idx);
691 rc = nfc_dep_link_up(dev, tgt_idx, comm);
698 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
704 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
707 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
709 dev = nfc_get_device(idx);
713 rc = nfc_dep_link_down(dev);
719 static struct genl_ops nfc_genl_ops[] = {
721 .cmd = NFC_CMD_GET_DEVICE,
722 .doit = nfc_genl_get_device,
723 .dumpit = nfc_genl_dump_devices,
724 .done = nfc_genl_dump_devices_done,
725 .policy = nfc_genl_policy,
728 .cmd = NFC_CMD_DEV_UP,
729 .doit = nfc_genl_dev_up,
730 .policy = nfc_genl_policy,
733 .cmd = NFC_CMD_DEV_DOWN,
734 .doit = nfc_genl_dev_down,
735 .policy = nfc_genl_policy,
738 .cmd = NFC_CMD_START_POLL,
739 .doit = nfc_genl_start_poll,
740 .policy = nfc_genl_policy,
743 .cmd = NFC_CMD_STOP_POLL,
744 .doit = nfc_genl_stop_poll,
745 .policy = nfc_genl_policy,
748 .cmd = NFC_CMD_DEP_LINK_UP,
749 .doit = nfc_genl_dep_link_up,
750 .policy = nfc_genl_policy,
753 .cmd = NFC_CMD_DEP_LINK_DOWN,
754 .doit = nfc_genl_dep_link_down,
755 .policy = nfc_genl_policy,
758 .cmd = NFC_CMD_GET_TARGET,
759 .dumpit = nfc_genl_dump_targets,
760 .done = nfc_genl_dump_targets_done,
761 .policy = nfc_genl_policy,
766 struct urelease_work {
767 struct work_struct w;
771 static void nfc_urelease_event_work(struct work_struct *work)
773 struct urelease_work *w = container_of(work, struct urelease_work, w);
774 struct class_dev_iter iter;
777 pr_debug("portid %d\n", w->portid);
779 mutex_lock(&nfc_devlist_mutex);
781 nfc_device_iter_init(&iter);
782 dev = nfc_device_iter_next(&iter);
785 mutex_lock(&dev->genl_data.genl_data_mutex);
787 if (dev->genl_data.poll_req_portid == w->portid) {
789 dev->genl_data.poll_req_portid = 0;
792 mutex_unlock(&dev->genl_data.genl_data_mutex);
794 dev = nfc_device_iter_next(&iter);
797 nfc_device_iter_exit(&iter);
799 mutex_unlock(&nfc_devlist_mutex);
804 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
805 unsigned long event, void *ptr)
807 struct netlink_notify *n = ptr;
808 struct urelease_work *w;
810 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
813 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
815 w = kmalloc(sizeof(*w), GFP_ATOMIC);
817 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
818 w->portid = n->portid;
819 schedule_work((struct work_struct *) w);
826 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
828 genl_data->poll_req_portid = 0;
829 mutex_init(&genl_data->genl_data_mutex);
832 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
834 mutex_destroy(&genl_data->genl_data_mutex);
837 static struct notifier_block nl_notifier = {
838 .notifier_call = nfc_genl_rcv_nl_event,
842 * nfc_genl_init() - Initialize netlink interface
844 * This initialization function registers the nfc netlink family.
846 int __init nfc_genl_init(void)
850 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
851 ARRAY_SIZE(nfc_genl_ops));
855 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
857 netlink_register_notifier(&nl_notifier);
863 * nfc_genl_exit() - Deinitialize netlink interface
865 * This exit function unregisters the nfc netlink family.
867 void nfc_genl_exit(void)
869 netlink_unregister_notifier(&nl_notifier);
870 genl_unregister_family(&nfc_genl_family);