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 ": " fmt
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
},
51 static int nfc_genl_send_target(struct sk_buff
*msg
, struct nfc_target
*target
,
52 struct netlink_callback
*cb
, int flags
)
58 hdr
= genlmsg_put(msg
, NETLINK_CB(cb
->skb
).pid
, cb
->nlh
->nlmsg_seq
,
59 &nfc_genl_family
, flags
, NFC_CMD_GET_TARGET
);
63 genl_dump_check_consistent(cb
, hdr
, &nfc_genl_family
);
65 NLA_PUT_U32(msg
, NFC_ATTR_TARGET_INDEX
, target
->idx
);
66 NLA_PUT_U32(msg
, NFC_ATTR_PROTOCOLS
,
67 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 return genlmsg_end(msg
, hdr
);
74 genlmsg_cancel(msg
, hdr
);
78 static struct nfc_dev
*__get_device_from_cb(struct netlink_callback
*cb
)
84 rc
= nlmsg_parse(cb
->nlh
, GENL_HDRLEN
+ nfc_genl_family
.hdrsize
,
85 nfc_genl_family
.attrbuf
,
86 nfc_genl_family
.maxattr
,
91 if (!nfc_genl_family
.attrbuf
[NFC_ATTR_DEVICE_INDEX
])
92 return ERR_PTR(-EINVAL
);
94 idx
= nla_get_u32(nfc_genl_family
.attrbuf
[NFC_ATTR_DEVICE_INDEX
]);
96 dev
= nfc_get_device(idx
);
98 return ERR_PTR(-ENODEV
);
103 static int nfc_genl_dump_targets(struct sk_buff
*skb
,
104 struct netlink_callback
*cb
)
107 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
113 dev
= __get_device_from_cb(cb
);
117 cb
->args
[1] = (long) dev
;
120 spin_lock_bh(&dev
->targets_lock
);
122 cb
->seq
= dev
->targets_generation
;
124 while (i
< dev
->n_targets
) {
125 rc
= nfc_genl_send_target(skb
, &dev
->targets
[i
], cb
,
133 spin_unlock_bh(&dev
->targets_lock
);
140 static int nfc_genl_dump_targets_done(struct netlink_callback
*cb
)
142 struct nfc_dev
*dev
= (struct nfc_dev
*) cb
->args
[1];
152 int nfc_genl_targets_found(struct nfc_dev
*dev
)
159 dev
->genl_data
.poll_req_pid
= 0;
161 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_ATOMIC
);
165 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
166 NFC_EVENT_TARGETS_FOUND
);
170 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
172 genlmsg_end(msg
, hdr
);
174 return genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_ATOMIC
);
177 genlmsg_cancel(msg
, hdr
);
183 int nfc_genl_device_added(struct nfc_dev
*dev
)
190 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
194 hdr
= genlmsg_put(msg
, 0, 0, &nfc_genl_family
, 0,
195 NFC_EVENT_DEVICE_ADDED
);
199 NLA_PUT_STRING(msg
, NFC_ATTR_DEVICE_NAME
, nfc_device_name(dev
));
200 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
201 NLA_PUT_U32(msg
, NFC_ATTR_PROTOCOLS
, dev
->supported_protocols
);
203 genlmsg_end(msg
, hdr
);
205 genlmsg_multicast(msg
, 0, nfc_genl_event_mcgrp
.id
, GFP_KERNEL
);
210 genlmsg_cancel(msg
, hdr
);
216 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
,
256 hdr
= genlmsg_put(msg
, pid
, seq
, &nfc_genl_family
, flags
,
262 genl_dump_check_consistent(cb
, hdr
, &nfc_genl_family
);
264 NLA_PUT_STRING(msg
, NFC_ATTR_DEVICE_NAME
, nfc_device_name(dev
));
265 NLA_PUT_U32(msg
, NFC_ATTR_DEVICE_INDEX
, dev
->idx
);
266 NLA_PUT_U32(msg
, NFC_ATTR_PROTOCOLS
, dev
->supported_protocols
);
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;
286 iter
= kmalloc(sizeof(struct class_dev_iter
), GFP_KERNEL
);
289 cb
->args
[0] = (long) iter
;
292 mutex_lock(&nfc_devlist_mutex
);
294 cb
->seq
= nfc_devlist_generation
;
297 nfc_device_iter_init(iter
);
298 dev
= nfc_device_iter_next(iter
);
304 rc
= nfc_genl_send_device(skb
, dev
, NETLINK_CB(cb
->skb
).pid
,
310 dev
= nfc_device_iter_next(iter
);
313 mutex_unlock(&nfc_devlist_mutex
);
315 cb
->args
[1] = (long) dev
;
320 static int nfc_genl_dump_devices_done(struct netlink_callback
*cb
)
322 struct class_dev_iter
*iter
= (struct class_dev_iter
*) cb
->args
[0];
326 nfc_device_iter_exit(iter
);
332 static int nfc_genl_get_device(struct sk_buff
*skb
, struct genl_info
*info
)
341 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
344 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
346 dev
= nfc_get_device(idx
);
350 msg
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
356 rc
= nfc_genl_send_device(msg
, dev
, info
->snd_pid
, info
->snd_seq
,
363 return genlmsg_reply(msg
, info
);
372 static int nfc_genl_dev_up(struct sk_buff
*skb
, struct genl_info
*info
)
380 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
383 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
385 dev
= nfc_get_device(idx
);
389 rc
= nfc_dev_up(dev
);
395 static int nfc_genl_dev_down(struct sk_buff
*skb
, struct genl_info
*info
)
403 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
406 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
408 dev
= nfc_get_device(idx
);
412 rc
= nfc_dev_down(dev
);
418 static int nfc_genl_start_poll(struct sk_buff
*skb
, struct genl_info
*info
)
427 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
] ||
428 !info
->attrs
[NFC_ATTR_PROTOCOLS
])
431 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
432 protocols
= nla_get_u32(info
->attrs
[NFC_ATTR_PROTOCOLS
]);
434 dev
= nfc_get_device(idx
);
438 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
440 rc
= nfc_start_poll(dev
, protocols
);
442 dev
->genl_data
.poll_req_pid
= info
->snd_pid
;
444 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
450 static int nfc_genl_stop_poll(struct sk_buff
*skb
, struct genl_info
*info
)
458 if (!info
->attrs
[NFC_ATTR_DEVICE_INDEX
])
461 idx
= nla_get_u32(info
->attrs
[NFC_ATTR_DEVICE_INDEX
]);
463 dev
= nfc_get_device(idx
);
467 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
469 if (dev
->genl_data
.poll_req_pid
!= info
->snd_pid
) {
474 rc
= nfc_stop_poll(dev
);
475 dev
->genl_data
.poll_req_pid
= 0;
478 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
483 static struct genl_ops nfc_genl_ops
[] = {
485 .cmd
= NFC_CMD_GET_DEVICE
,
486 .doit
= nfc_genl_get_device
,
487 .dumpit
= nfc_genl_dump_devices
,
488 .done
= nfc_genl_dump_devices_done
,
489 .policy
= nfc_genl_policy
,
492 .cmd
= NFC_CMD_DEV_UP
,
493 .doit
= nfc_genl_dev_up
,
494 .policy
= nfc_genl_policy
,
497 .cmd
= NFC_CMD_DEV_DOWN
,
498 .doit
= nfc_genl_dev_down
,
499 .policy
= nfc_genl_policy
,
502 .cmd
= NFC_CMD_START_POLL
,
503 .doit
= nfc_genl_start_poll
,
504 .policy
= nfc_genl_policy
,
507 .cmd
= NFC_CMD_STOP_POLL
,
508 .doit
= nfc_genl_stop_poll
,
509 .policy
= nfc_genl_policy
,
512 .cmd
= NFC_CMD_GET_TARGET
,
513 .dumpit
= nfc_genl_dump_targets
,
514 .done
= nfc_genl_dump_targets_done
,
515 .policy
= nfc_genl_policy
,
519 static int nfc_genl_rcv_nl_event(struct notifier_block
*this,
520 unsigned long event
, void *ptr
)
522 struct netlink_notify
*n
= ptr
;
523 struct class_dev_iter iter
;
526 if (event
!= NETLINK_URELEASE
|| n
->protocol
!= NETLINK_GENERIC
)
529 pr_debug("NETLINK_URELEASE event from id %d\n", n
->pid
);
531 nfc_device_iter_init(&iter
);
532 dev
= nfc_device_iter_next(&iter
);
535 mutex_lock(&dev
->genl_data
.genl_data_mutex
);
536 if (dev
->genl_data
.poll_req_pid
== n
->pid
) {
538 dev
->genl_data
.poll_req_pid
= 0;
540 mutex_unlock(&dev
->genl_data
.genl_data_mutex
);
541 dev
= nfc_device_iter_next(&iter
);
544 nfc_device_iter_exit(&iter
);
550 void nfc_genl_data_init(struct nfc_genl_data
*genl_data
)
552 genl_data
->poll_req_pid
= 0;
553 mutex_init(&genl_data
->genl_data_mutex
);
556 void nfc_genl_data_exit(struct nfc_genl_data
*genl_data
)
558 mutex_destroy(&genl_data
->genl_data_mutex
);
561 static struct notifier_block nl_notifier
= {
562 .notifier_call
= nfc_genl_rcv_nl_event
,
566 * nfc_genl_init() - Initialize netlink interface
568 * This initialization function registers the nfc netlink family.
570 int __init
nfc_genl_init(void)
574 rc
= genl_register_family_with_ops(&nfc_genl_family
, nfc_genl_ops
,
575 ARRAY_SIZE(nfc_genl_ops
));
579 rc
= genl_register_mc_group(&nfc_genl_family
, &nfc_genl_event_mcgrp
);
581 netlink_register_notifier(&nl_notifier
);
587 * nfc_genl_exit() - Deinitialize netlink interface
589 * This exit function unregisters the nfc netlink family.
591 void nfc_genl_exit(void)
593 netlink_unregister_notifier(&nl_notifier
);
594 genl_unregister_family(&nfc_genl_family
);