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
, 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 if (target
->nfcid1_len
> 0)
71 NLA_PUT(msg
, NFC_ATTR_TARGET_NFCID1
, target
->nfcid1_len
,
73 if (target
->sensb_res_len
> 0)
74 NLA_PUT(msg
, NFC_ATTR_TARGET_SENSB_RES
, target
->sensb_res_len
,
76 if (target
->sensf_res_len
> 0)
77 NLA_PUT(msg
, NFC_ATTR_TARGET_SENSF_RES
, target
->sensf_res_len
,
80 return genlmsg_end(msg
, hdr
);
83 genlmsg_cancel(msg
, hdr
);
87 static struct nfc_dev
*__get_device_from_cb(struct netlink_callback
*cb
)
93 rc
= nlmsg_parse(cb
->nlh
, GENL_HDRLEN
+ nfc_genl_family
.hdrsize
,
94 nfc_genl_family
.attrbuf
,
95 nfc_genl_family
.maxattr
,
100 if (!nfc_genl_family
.attrbuf
[NFC_ATTR_DEVICE_INDEX
])
101 return ERR_PTR(-EINVAL
);
103 idx
= nla_get_u32(nfc_genl_family
.attrbuf
[NFC_ATTR_DEVICE_INDEX
]);
105 dev
= nfc_get_device(idx
);
107 return ERR_PTR(-ENODEV
);
112 static int nfc_genl_dump_targets(struct sk_buff
*skb
,
113 struct netlink_callback
*cb
)
116 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
120 dev
= __get_device_from_cb(cb
);
124 cb
->args
[1] = (long) dev
;
127 spin_lock_bh(&dev
->targets_lock
);
129 cb
->seq
= dev
->targets_generation
;
131 while (i
< dev
->n_targets
) {
132 rc
= nfc_genl_send_target(skb
, &dev
->targets
[i
], cb
,
140 spin_unlock_bh(&dev
->targets_lock
);
147 static int nfc_genl_dump_targets_done(struct netlink_callback
*cb
)
149 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
157 int nfc_genl_targets_found(struct nfc_dev
*dev
)
162 dev
->genl_data
.poll_req_pid
= 0;
164 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
168 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
169 NFC_EVENT_TARGETS_FOUND
);
173 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
175 genlmsg_end(msg
, hdr
);
177 return genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
180 genlmsg_cancel(msg
, hdr
);
186 int nfc_genl_device_added(struct nfc_dev
*dev
)
191 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
195 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
196 NFC_EVENT_DEVICE_ADDED
);
200 NLA_PUT_STRING(msg
, NFC_ATTR_DEVICE_NAME
, nfc_device_name(dev
));
201 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
202 NLA_PUT_U32(msg
, NFC_ATTR_PROTOCOLS
, dev
->supported_protocols
);
203 NLA_PUT_U8(msg
, NFC_ATTR_DEVICE_POWERED
, dev
->dev_up
);
205 genlmsg_end(msg
, hdr
);
207 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_KERNEL
);
212 genlmsg_cancel(msg
, hdr
);
218 int nfc_genl_device_removed(struct nfc_dev
*dev
)
223 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
227 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
228 NFC_EVENT_DEVICE_REMOVED
);
232 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
234 genlmsg_end(msg
, hdr
);
236 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_KERNEL
);
241 genlmsg_cancel(msg
, hdr
);
247 static int nfc_genl_send_device(struct sk_buff
*msg
, struct nfc_dev
*dev
,
249 struct netlink_callback
*cb
,
254 hdr
= genlmsg_put(msg
, pid
, seq
, &nfc_genl_family
, flags
,
260 genl_dump_check_consistent(cb
, hdr
, &nfc_genl_family
);
262 NLA_PUT_STRING(msg
, NFC_ATTR_DEVICE_NAME
, nfc_device_name(dev
));
263 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
264 NLA_PUT_U32(msg
, NFC_ATTR_PROTOCOLS
, dev
->supported_protocols
);
265 NLA_PUT_U8(msg
, NFC_ATTR_DEVICE_POWERED
, dev
->dev_up
);
267 return genlmsg_end(msg
, hdr
);
270 genlmsg_cancel(msg
, hdr
);
274 static int nfc_genl_dump_devices(struct sk_buff
*skb
,
275 struct netlink_callback
*cb
)
277 struct class_dev_iter
*iter
= (struct class_dev_iter
*) cb
->args
[0];
278 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
279 bool first_call
= false;
283 iter
= kmalloc(sizeof(struct class_dev_iter
), GFP_KERNEL
);
286 cb
->args
[0] = (long) iter
;
289 mutex_lock(&nfc_devlist_mutex
);
291 cb
->seq
= nfc_devlist_generation
;
294 nfc_device_iter_init(iter
);
295 dev
= nfc_device_iter_next(iter
);
301 rc
= nfc_genl_send_device(skb
, dev
, NETLINK_CB(cb
->skb
).pid
,
302 cb
->nlh
->nlmsg_seq
, cb
, NLM_F_MULTI
);
306 dev
= nfc_device_iter_next(iter
);
309 mutex_unlock(&nfc_devlist_mutex
);
311 cb
->args
[1] = (long) dev
;
316 static int nfc_genl_dump_devices_done(struct netlink_callback
*cb
)
318 struct class_dev_iter
*iter
= (struct class_dev_iter
*) cb
->args
[0];
320 nfc_device_iter_exit(iter
);
326 int nfc_genl_dep_link_up_event(struct nfc_dev
*dev
, u32 target_idx
,
327 u8 comm_mode
, u8 rf_mode
)
332 pr_debug("DEP link is up\n");
334 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
338 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0, NFC_CMD_DEP_LINK_UP
);
342 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
343 if (rf_mode
== NFC_RF_INITIATOR
)
344 NLA_PUT_U32(msg
, NFC_ATTR_TARGET_INDEX
, target_idx
);
345 NLA_PUT_U8(msg
, NFC_ATTR_COMM_MODE
, comm_mode
);
346 NLA_PUT_U8(msg
, NFC_ATTR_RF_MODE
, rf_mode
);
348 genlmsg_end(msg
, hdr
);
350 dev
->dep_link_up
= true;
352 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
357 genlmsg_cancel(msg
, hdr
);
363 int nfc_genl_dep_link_down_event(struct nfc_dev
*dev
)
368 pr_debug("DEP link is down\n");
370 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
374 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
375 NFC_CMD_DEP_LINK_DOWN
);
379 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
381 genlmsg_end(msg
, hdr
);
383 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
388 genlmsg_cancel(msg
, hdr
);
394 static int nfc_genl_get_device(struct sk_buff
*skb
, struct genl_info
*info
)
401 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
404 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
406 dev
= nfc_get_device(idx
);
410 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
416 rc
= nfc_genl_send_device(msg
, dev
, info
->snd_pid
, info
->snd_seq
,
423 return genlmsg_reply(msg
, info
);
432 static int nfc_genl_dev_up(struct sk_buff
*skb
, struct genl_info
*info
)
438 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
441 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
443 dev
= nfc_get_device(idx
);
447 rc
= nfc_dev_up(dev
);
453 static int nfc_genl_dev_down(struct sk_buff
*skb
, struct genl_info
*info
)
459 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
462 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
464 dev
= nfc_get_device(idx
);
468 rc
= nfc_dev_down(dev
);
474 static int nfc_genl_start_poll(struct sk_buff
*skb
, struct genl_info
*info
)
481 pr_debug("Poll start\n");
483 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
] ||
484 !info
->attrs
[NFC_ATTR_PROTOCOLS
])
487 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
488 protocols
= nla_get_u32(info
->attrs
[NFC_ATTR_PROTOCOLS
]);
490 dev
= nfc_get_device(idx
);
494 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
496 rc
= nfc_start_poll(dev
, protocols
);
498 dev
->genl_data
.poll_req_pid
= info
->snd_pid
;
500 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
506 static int nfc_genl_stop_poll(struct sk_buff
*skb
, struct genl_info
*info
)
512 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
515 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
517 dev
= nfc_get_device(idx
);
521 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
523 if (dev
->genl_data
.poll_req_pid
!= info
->snd_pid
) {
528 rc
= nfc_stop_poll(dev
);
529 dev
->genl_data
.poll_req_pid
= 0;
532 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
537 static int nfc_genl_dep_link_up(struct sk_buff
*skb
, struct genl_info
*info
)
544 pr_debug("DEP link up\n");
546 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
] ||
547 !info
->attrs
[NFC_ATTR_COMM_MODE
])
550 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
551 if (!info
->attrs
[NFC_ATTR_TARGET_INDEX
])
552 tgt_idx
= NFC_TARGET_IDX_ANY
;
554 tgt_idx
= nla_get_u32(info
->attrs
[NFC_ATTR_TARGET_INDEX
]);
556 comm
= nla_get_u8(info
->attrs
[NFC_ATTR_COMM_MODE
]);
558 if (comm
!= NFC_COMM_ACTIVE
&& comm
!= NFC_COMM_PASSIVE
)
561 dev
= nfc_get_device(idx
);
565 rc
= nfc_dep_link_up(dev
, tgt_idx
, comm
);
572 static int nfc_genl_dep_link_down(struct sk_buff
*skb
, struct genl_info
*info
)
578 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
581 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
583 dev
= nfc_get_device(idx
);
587 rc
= nfc_dep_link_down(dev
);
593 static struct genl_ops nfc_genl_ops
[] = {
595 .cmd
= NFC_CMD_GET_DEVICE
,
596 .doit
= nfc_genl_get_device
,
597 .dumpit
= nfc_genl_dump_devices
,
598 .done
= nfc_genl_dump_devices_done
,
599 .policy
= nfc_genl_policy
,
602 .cmd
= NFC_CMD_DEV_UP
,
603 .doit
= nfc_genl_dev_up
,
604 .policy
= nfc_genl_policy
,
607 .cmd
= NFC_CMD_DEV_DOWN
,
608 .doit
= nfc_genl_dev_down
,
609 .policy
= nfc_genl_policy
,
612 .cmd
= NFC_CMD_START_POLL
,
613 .doit
= nfc_genl_start_poll
,
614 .policy
= nfc_genl_policy
,
617 .cmd
= NFC_CMD_STOP_POLL
,
618 .doit
= nfc_genl_stop_poll
,
619 .policy
= nfc_genl_policy
,
622 .cmd
= NFC_CMD_DEP_LINK_UP
,
623 .doit
= nfc_genl_dep_link_up
,
624 .policy
= nfc_genl_policy
,
627 .cmd
= NFC_CMD_DEP_LINK_DOWN
,
628 .doit
= nfc_genl_dep_link_down
,
629 .policy
= nfc_genl_policy
,
632 .cmd
= NFC_CMD_GET_TARGET
,
633 .dumpit
= nfc_genl_dump_targets
,
634 .done
= nfc_genl_dump_targets_done
,
635 .policy
= nfc_genl_policy
,
639 static int nfc_genl_rcv_nl_event(struct notifier_block
*this,
640 unsigned long event
, void *ptr
)
642 struct netlink_notify
*n
= ptr
;
643 struct class_dev_iter iter
;
646 if (event
!= NETLINK_URELEASE
|| n
->protocol
!= NETLINK_GENERIC
)
649 pr_debug("NETLINK_URELEASE event from id %d\n", n
->pid
);
651 nfc_device_iter_init(&iter
);
652 dev
= nfc_device_iter_next(&iter
);
655 if (dev
->genl_data
.poll_req_pid
== n
->pid
) {
657 dev
->genl_data
.poll_req_pid
= 0;
659 dev
= nfc_device_iter_next(&iter
);
662 nfc_device_iter_exit(&iter
);
668 void nfc_genl_data_init(struct nfc_genl_data
*genl_data
)
670 genl_data
->poll_req_pid
= 0;
671 mutex_init(&genl_data
->genl_data_mutex
);
674 void nfc_genl_data_exit(struct nfc_genl_data
*genl_data
)
676 mutex_destroy(&genl_data
->genl_data_mutex
);
679 static struct notifier_block nl_notifier
= {
680 .notifier_call
= nfc_genl_rcv_nl_event
,
684 * nfc_genl_init() - Initialize netlink interface
686 * This initialization function registers the nfc netlink family.
688 int __init
nfc_genl_init(void)
692 rc
= genl_register_family_with_ops(&nfc_genl_family
, nfc_genl_ops
,
693 ARRAY_SIZE(nfc_genl_ops
));
697 rc
= genl_register_mc_group(&nfc_genl_family
, &nfc_genl_event_mcgrp
);
699 netlink_register_notifier(&nl_notifier
);
705 * nfc_genl_exit() - Deinitialize netlink interface
707 * This exit function unregisters the nfc netlink family.
709 void nfc_genl_exit(void)
711 netlink_unregister_notifier(&nl_notifier
);
712 genl_unregister_family(&nfc_genl_family
);