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 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
))
71 if (target
->nfcid1_len
> 0 &&
72 nla_put(msg
, NFC_ATTR_TARGET_NFCID1
, target
->nfcid1_len
,
75 if (target
->sensb_res_len
> 0 &&
76 nla_put(msg
, NFC_ATTR_TARGET_SENSB_RES
, target
->sensb_res_len
,
79 if (target
->sensf_res_len
> 0 &&
80 nla_put(msg
, NFC_ATTR_TARGET_SENSF_RES
, target
->sensf_res_len
,
84 return genlmsg_end(msg
, hdr
);
87 genlmsg_cancel(msg
, hdr
);
91 static struct nfc_dev
*__get_device_from_cb(struct netlink_callback
*cb
)
97 rc
= nlmsg_parse(cb
->nlh
, GENL_HDRLEN
+ nfc_genl_family
.hdrsize
,
98 nfc_genl_family
.attrbuf
,
99 nfc_genl_family
.maxattr
,
104 if (!nfc_genl_family
.attrbuf
[NFC_ATTR_DEVICE_INDEX
])
105 return ERR_PTR(-EINVAL
);
107 idx
= nla_get_u32(nfc_genl_family
.attrbuf
[NFC_ATTR_DEVICE_INDEX
]);
109 dev
= nfc_get_device(idx
);
111 return ERR_PTR(-ENODEV
);
116 static int nfc_genl_dump_targets(struct sk_buff
*skb
,
117 struct netlink_callback
*cb
)
120 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
124 dev
= __get_device_from_cb(cb
);
128 cb
->args
[1] = (long) dev
;
131 spin_lock_bh(&dev
->targets_lock
);
133 cb
->seq
= dev
->targets_generation
;
135 while (i
< dev
->n_targets
) {
136 rc
= nfc_genl_send_target(skb
, &dev
->targets
[i
], cb
,
144 spin_unlock_bh(&dev
->targets_lock
);
151 static int nfc_genl_dump_targets_done(struct netlink_callback
*cb
)
153 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
161 int nfc_genl_targets_found(struct nfc_dev
*dev
)
166 dev
->genl_data
.poll_req_pid
= 0;
168 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
172 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
173 NFC_EVENT_TARGETS_FOUND
);
177 if (nla_put_u32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
))
178 goto nla_put_failure
;
180 genlmsg_end(msg
, hdr
);
182 return genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
185 genlmsg_cancel(msg
, hdr
);
191 int nfc_genl_target_lost(struct nfc_dev
*dev
, u32 target_idx
)
196 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
200 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
201 NFC_EVENT_TARGET_LOST
);
205 if (nla_put_string(msg
, NFC_ATTR_DEVICE_NAME
, nfc_device_name(dev
)) ||
206 nla_put_u32(msg
, NFC_ATTR_TARGET_INDEX
, target_idx
))
207 goto nla_put_failure
;
209 genlmsg_end(msg
, hdr
);
211 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_KERNEL
);
216 genlmsg_cancel(msg
, hdr
);
222 int nfc_genl_device_added(struct nfc_dev
*dev
)
227 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
231 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
232 NFC_EVENT_DEVICE_ADDED
);
236 if (nla_put_string(msg
, NFC_ATTR_DEVICE_NAME
, nfc_device_name(dev
)) ||
237 nla_put_u32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
) ||
238 nla_put_u32(msg
, NFC_ATTR_PROTOCOLS
, dev
->supported_protocols
) ||
239 nla_put_u8(msg
, NFC_ATTR_DEVICE_POWERED
, dev
->dev_up
))
240 goto nla_put_failure
;
242 genlmsg_end(msg
, hdr
);
244 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_KERNEL
);
249 genlmsg_cancel(msg
, hdr
);
255 int nfc_genl_device_removed(struct nfc_dev
*dev
)
260 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
264 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
265 NFC_EVENT_DEVICE_REMOVED
);
269 if (nla_put_u32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
))
270 goto nla_put_failure
;
272 genlmsg_end(msg
, hdr
);
274 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_KERNEL
);
279 genlmsg_cancel(msg
, hdr
);
285 static int nfc_genl_send_device(struct sk_buff
*msg
, struct nfc_dev
*dev
,
287 struct netlink_callback
*cb
,
292 hdr
= genlmsg_put(msg
, pid
, seq
, &nfc_genl_family
, flags
,
298 genl_dump_check_consistent(cb
, hdr
, &nfc_genl_family
);
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 return genlmsg_end(msg
, hdr
);
309 genlmsg_cancel(msg
, hdr
);
313 static int nfc_genl_dump_devices(struct sk_buff
*skb
,
314 struct netlink_callback
*cb
)
316 struct class_dev_iter
*iter
= (struct class_dev_iter
*) cb
->args
[0];
317 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
318 bool first_call
= false;
322 iter
= kmalloc(sizeof(struct class_dev_iter
), GFP_KERNEL
);
325 cb
->args
[0] = (long) iter
;
328 mutex_lock(&nfc_devlist_mutex
);
330 cb
->seq
= nfc_devlist_generation
;
333 nfc_device_iter_init(iter
);
334 dev
= nfc_device_iter_next(iter
);
340 rc
= nfc_genl_send_device(skb
, dev
, NETLINK_CB(cb
->skb
).pid
,
341 cb
->nlh
->nlmsg_seq
, cb
, NLM_F_MULTI
);
345 dev
= nfc_device_iter_next(iter
);
348 mutex_unlock(&nfc_devlist_mutex
);
350 cb
->args
[1] = (long) dev
;
355 static int nfc_genl_dump_devices_done(struct netlink_callback
*cb
)
357 struct class_dev_iter
*iter
= (struct class_dev_iter
*) cb
->args
[0];
359 nfc_device_iter_exit(iter
);
365 int nfc_genl_dep_link_up_event(struct nfc_dev
*dev
, u32 target_idx
,
366 u8 comm_mode
, u8 rf_mode
)
371 pr_debug("DEP link is up\n");
373 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
377 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0, NFC_CMD_DEP_LINK_UP
);
381 if (nla_put_u32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
))
382 goto nla_put_failure
;
383 if (rf_mode
== NFC_RF_INITIATOR
&&
384 nla_put_u32(msg
, NFC_ATTR_TARGET_INDEX
, target_idx
))
385 goto nla_put_failure
;
386 if (nla_put_u8(msg
, NFC_ATTR_COMM_MODE
, comm_mode
) ||
387 nla_put_u8(msg
, NFC_ATTR_RF_MODE
, rf_mode
))
388 goto nla_put_failure
;
390 genlmsg_end(msg
, hdr
);
392 dev
->dep_link_up
= true;
394 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
399 genlmsg_cancel(msg
, hdr
);
405 int nfc_genl_dep_link_down_event(struct nfc_dev
*dev
)
410 pr_debug("DEP link is down\n");
412 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
416 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
417 NFC_CMD_DEP_LINK_DOWN
);
421 if (nla_put_u32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
))
422 goto nla_put_failure
;
424 genlmsg_end(msg
, hdr
);
426 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
431 genlmsg_cancel(msg
, hdr
);
437 static int nfc_genl_get_device(struct sk_buff
*skb
, struct genl_info
*info
)
444 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
447 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
449 dev
= nfc_get_device(idx
);
453 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
459 rc
= nfc_genl_send_device(msg
, dev
, info
->snd_pid
, info
->snd_seq
,
466 return genlmsg_reply(msg
, info
);
475 static int nfc_genl_dev_up(struct sk_buff
*skb
, struct genl_info
*info
)
481 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
484 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
486 dev
= nfc_get_device(idx
);
490 rc
= nfc_dev_up(dev
);
496 static int nfc_genl_dev_down(struct sk_buff
*skb
, struct genl_info
*info
)
502 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
505 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
507 dev
= nfc_get_device(idx
);
511 rc
= nfc_dev_down(dev
);
517 static int nfc_genl_start_poll(struct sk_buff
*skb
, struct genl_info
*info
)
524 pr_debug("Poll start\n");
526 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
] ||
527 !info
->attrs
[NFC_ATTR_PROTOCOLS
])
530 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
531 protocols
= nla_get_u32(info
->attrs
[NFC_ATTR_PROTOCOLS
]);
533 dev
= nfc_get_device(idx
);
537 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
539 rc
= nfc_start_poll(dev
, protocols
);
541 dev
->genl_data
.poll_req_pid
= info
->snd_pid
;
543 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
549 static int nfc_genl_stop_poll(struct sk_buff
*skb
, struct genl_info
*info
)
555 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
558 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
560 dev
= nfc_get_device(idx
);
564 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
566 if (dev
->genl_data
.poll_req_pid
!= info
->snd_pid
) {
571 rc
= nfc_stop_poll(dev
);
572 dev
->genl_data
.poll_req_pid
= 0;
575 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
580 static int nfc_genl_dep_link_up(struct sk_buff
*skb
, struct genl_info
*info
)
587 pr_debug("DEP link up\n");
589 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
] ||
590 !info
->attrs
[NFC_ATTR_COMM_MODE
])
593 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
594 if (!info
->attrs
[NFC_ATTR_TARGET_INDEX
])
595 tgt_idx
= NFC_TARGET_IDX_ANY
;
597 tgt_idx
= nla_get_u32(info
->attrs
[NFC_ATTR_TARGET_INDEX
]);
599 comm
= nla_get_u8(info
->attrs
[NFC_ATTR_COMM_MODE
]);
601 if (comm
!= NFC_COMM_ACTIVE
&& comm
!= NFC_COMM_PASSIVE
)
604 dev
= nfc_get_device(idx
);
608 rc
= nfc_dep_link_up(dev
, tgt_idx
, comm
);
615 static int nfc_genl_dep_link_down(struct sk_buff
*skb
, struct genl_info
*info
)
621 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
624 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
626 dev
= nfc_get_device(idx
);
630 rc
= nfc_dep_link_down(dev
);
636 static struct genl_ops nfc_genl_ops
[] = {
638 .cmd
= NFC_CMD_GET_DEVICE
,
639 .doit
= nfc_genl_get_device
,
640 .dumpit
= nfc_genl_dump_devices
,
641 .done
= nfc_genl_dump_devices_done
,
642 .policy
= nfc_genl_policy
,
645 .cmd
= NFC_CMD_DEV_UP
,
646 .doit
= nfc_genl_dev_up
,
647 .policy
= nfc_genl_policy
,
650 .cmd
= NFC_CMD_DEV_DOWN
,
651 .doit
= nfc_genl_dev_down
,
652 .policy
= nfc_genl_policy
,
655 .cmd
= NFC_CMD_START_POLL
,
656 .doit
= nfc_genl_start_poll
,
657 .policy
= nfc_genl_policy
,
660 .cmd
= NFC_CMD_STOP_POLL
,
661 .doit
= nfc_genl_stop_poll
,
662 .policy
= nfc_genl_policy
,
665 .cmd
= NFC_CMD_DEP_LINK_UP
,
666 .doit
= nfc_genl_dep_link_up
,
667 .policy
= nfc_genl_policy
,
670 .cmd
= NFC_CMD_DEP_LINK_DOWN
,
671 .doit
= nfc_genl_dep_link_down
,
672 .policy
= nfc_genl_policy
,
675 .cmd
= NFC_CMD_GET_TARGET
,
676 .dumpit
= nfc_genl_dump_targets
,
677 .done
= nfc_genl_dump_targets_done
,
678 .policy
= nfc_genl_policy
,
682 static int nfc_genl_rcv_nl_event(struct notifier_block
*this,
683 unsigned long event
, void *ptr
)
685 struct netlink_notify
*n
= ptr
;
686 struct class_dev_iter iter
;
689 if (event
!= NETLINK_URELEASE
|| n
->protocol
!= NETLINK_GENERIC
)
692 pr_debug("NETLINK_URELEASE event from id %d\n", n
->pid
);
694 nfc_device_iter_init(&iter
);
695 dev
= nfc_device_iter_next(&iter
);
698 if (dev
->genl_data
.poll_req_pid
== n
->pid
) {
700 dev
->genl_data
.poll_req_pid
= 0;
702 dev
= nfc_device_iter_next(&iter
);
705 nfc_device_iter_exit(&iter
);
711 void nfc_genl_data_init(struct nfc_genl_data
*genl_data
)
713 genl_data
->poll_req_pid
= 0;
714 mutex_init(&genl_data
->genl_data_mutex
);
717 void nfc_genl_data_exit(struct nfc_genl_data
*genl_data
)
719 mutex_destroy(&genl_data
->genl_data_mutex
);
722 static struct notifier_block nl_notifier
= {
723 .notifier_call
= nfc_genl_rcv_nl_event
,
727 * nfc_genl_init() - Initialize netlink interface
729 * This initialization function registers the nfc netlink family.
731 int __init
nfc_genl_init(void)
735 rc
= genl_register_family_with_ops(&nfc_genl_family
, nfc_genl_ops
,
736 ARRAY_SIZE(nfc_genl_ops
));
740 rc
= genl_register_mc_group(&nfc_genl_family
, &nfc_genl_event_mcgrp
);
742 netlink_register_notifier(&nl_notifier
);
748 * nfc_genl_exit() - Deinitialize netlink interface
750 * This exit function unregisters the nfc netlink family.
752 void nfc_genl_exit(void)
754 netlink_unregister_notifier(&nl_notifier
);
755 genl_unregister_family(&nfc_genl_family
);