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networking: make skb_push & __skb_push return void pointers
[mirror_ubuntu-hirsute-kernel.git] / net / nfc / nci / hci.c
CommitLineData
11f54f22
CR		 1/*
2 * The NFC Controller Interface is the communication protocol between an
3 * NFC Controller (NFCC) and a Device Host (DH).
4 * This is the HCI over NCI implementation, as specified in the 10.2
5 * section of the NCI 1.1 specification.
6 *
7 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation
12 *
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.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 *
21 */
22
23#include <linux/skbuff.h>
24
25#include "../nfc.h"
26#include <net/nfc/nci.h>
27#include <net/nfc/nci_core.h>
28#include <linux/nfc.h>
29
30struct nci_data {
31 u8 conn_id;
32 u8 pipe;
33 u8 cmd;
34 const u8 *data;
35 u32 data_len;
36} __packed;
37
38struct nci_hci_create_pipe_params {
39 u8 src_gate;
40 u8 dest_host;
41 u8 dest_gate;
42} __packed;
43
44struct nci_hci_create_pipe_resp {
45 u8 src_host;
46 u8 src_gate;
47 u8 dest_host;
48 u8 dest_gate;
49 u8 pipe;
50} __packed;
51
52struct nci_hci_delete_pipe_noti {
53 u8 pipe;
54} __packed;
55
56struct nci_hci_all_pipe_cleared_noti {
57 u8 host;
58} __packed;
59
60struct nci_hcp_message {
61 u8 header; /* type -cmd,evt,rsp- + instruction */
62 u8 data[];
63} __packed;
64
65struct nci_hcp_packet {
66 u8 header; /* cbit+pipe */
67 struct nci_hcp_message message;
68} __packed;
69
70#define NCI_HCI_ANY_SET_PARAMETER 0x01
71#define NCI_HCI_ANY_GET_PARAMETER 0x02
72#define NCI_HCI_ANY_CLOSE_PIPE 0x04
fa6fbade 73#define NCI_HCI_ADM_CLEAR_ALL_PIPE 0x14
11f54f22
CR		 74
75#define NCI_HFP_NO_CHAINING 0x80
76
77#define NCI_NFCEE_ID_HCI 0x80
78
79#define NCI_EVT_HOT_PLUG 0x03
80
81#define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01
a1b0b941
CR		 82#define NCI_HCI_ADM_CREATE_PIPE 0x10
83#define NCI_HCI_ADM_DELETE_PIPE 0x11
11f54f22
CR		 84
85/* HCP headers */
86#define NCI_HCI_HCP_PACKET_HEADER_LEN 1
87#define NCI_HCI_HCP_MESSAGE_HEADER_LEN 1
88#define NCI_HCI_HCP_HEADER_LEN 2
89
90/* HCP types */
91#define NCI_HCI_HCP_COMMAND 0x00
92#define NCI_HCI_HCP_EVENT 0x01
93#define NCI_HCI_HCP_RESPONSE 0x02
94
95#define NCI_HCI_ADM_NOTIFY_PIPE_CREATED 0x12
96#define NCI_HCI_ADM_NOTIFY_PIPE_DELETED 0x13
97#define NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
98
99#define NCI_HCI_FRAGMENT 0x7f
100#define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
101 ((instr) & 0x3f))
102
103#define NCI_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
104#define NCI_HCP_MSG_GET_CMD(header) (header & 0x3f)
105#define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
106
d8cd37ed
CR		 107static int nci_hci_result_to_errno(u8 result)
108{
109 switch (result) {
110 case NCI_HCI_ANY_OK:
111 return 0;
112 case NCI_HCI_ANY_E_REG_PAR_UNKNOWN:
113 return -EOPNOTSUPP;
114 case NCI_HCI_ANY_E_TIMEOUT:
115 return -ETIME;
116 default:
117 return -1;
118 }
119}
120
11f54f22
CR		 121/* HCI core */
122static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
123{
124 int i;
125
126 for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
127 hdev->pipes[i].gate = NCI_HCI_INVALID_GATE;
128 hdev->pipes[i].host = NCI_HCI_INVALID_HOST;
129 }
130 memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
131}
132
133static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
134{
135 int i;
136
137 for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
138 if (ndev->hci_dev->pipes[i].host == host) {
139 ndev->hci_dev->pipes[i].gate = NCI_HCI_INVALID_GATE;
140 ndev->hci_dev->pipes[i].host = NCI_HCI_INVALID_HOST;
141 }
142 }
143}
144
145/* Fragment HCI data over NCI packet.
146 * NFC Forum NCI 10.2.2 Data Exchange:
147 * The payload of the Data Packets sent on the Logical Connection SHALL be
148 * valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL
149 * contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be
150 * applied to Data Messages in either direction. The HCI fragmentation mechanism
151 * is used if required.
152 */
153static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
154 const u8 data_type, const u8 *data,
155 size_t data_len)
156{
157 struct nci_conn_info *conn_info;
158 struct sk_buff *skb;
159 int len, i, r;
160 u8 cb = pipe;
161
162 conn_info = ndev->hci_dev->conn_info;
163 if (!conn_info)
164 return -EPROTO;
165
500c4ef0
CR		 166 i = 0;
167 skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
11f54f22
CR		 168 NCI_DATA_HDR_SIZE, GFP_KERNEL);
169 if (!skb)
170 return -ENOMEM;
171
500c4ef0 172 skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
d58ff351 173 *(u8 *)skb_push(skb, 1) = data_type;
11f54f22 174
11f54f22 175 do {
500c4ef0
CR		 176 len = conn_info->max_pkt_payload_len;
177
11f54f22
CR		 178 /* If last packet add NCI_HFP_NO_CHAINING */
179 if (i + conn_info->max_pkt_payload_len -
180 (skb->len + 1) >= data_len) {
181 cb |= NCI_HFP_NO_CHAINING;
182 len = data_len - i;
183 } else {
184 len = conn_info->max_pkt_payload_len - skb->len - 1;
185 }
186
d58ff351 187 *(u8 *)skb_push(skb, 1) = cb;
11f54f22
CR		 188
189 if (len > 0)
59ae1d12 190 skb_put_data(skb, data + i, len);
11f54f22
CR		 191
192 r = nci_send_data(ndev, conn_info->conn_id, skb);
193 if (r < 0)
194 return r;
195
196 i += len;
500c4ef0 197
11f54f22 198 if (i < data_len) {
500c4ef0
CR		 199 skb = nci_skb_alloc(ndev,
200 conn_info->max_pkt_payload_len +
201 NCI_DATA_HDR_SIZE, GFP_KERNEL);
202 if (!skb)
203 return -ENOMEM;
204
205 skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
11f54f22
CR		 206 }
207 } while (i < data_len);
208
209 return i;
210}
211
212static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
213{
214 struct nci_data *data = (struct nci_data *)opt;
215
216 nci_hci_send_data(ndev, data->pipe, data->cmd,
217 data->data, data->data_len);
218}
219
220int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
221 const u8 *param, size_t param_len)
222{
223 u8 pipe = ndev->hci_dev->gate2pipe[gate];
224
225 if (pipe == NCI_HCI_INVALID_PIPE)
226 return -EADDRNOTAVAIL;
227
228 return nci_hci_send_data(ndev, pipe,
229 NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
230 param, param_len);
231}
232EXPORT_SYMBOL(nci_hci_send_event);
233
234int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
235 const u8 *param, size_t param_len,
236 struct sk_buff **skb)
237{
d8cd37ed
CR		 238 struct nci_hcp_message *message;
239 struct nci_conn_info *conn_info;
11f54f22
CR		 240 struct nci_data data;
241 int r;
242 u8 pipe = ndev->hci_dev->gate2pipe[gate];
243
244 if (pipe == NCI_HCI_INVALID_PIPE)
245 return -EADDRNOTAVAIL;
246
247 conn_info = ndev->hci_dev->conn_info;
248 if (!conn_info)
249 return -EPROTO;
250
251 data.conn_id = conn_info->conn_id;
252 data.pipe = pipe;
253 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
254 data.data = param;
255 data.data_len = param_len;
256
257 r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
258 msecs_to_jiffies(NCI_DATA_TIMEOUT));
d8cd37ed
CR		 259 if (r == NCI_STATUS_OK) {
260 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
261 r = nci_hci_result_to_errno(
262 NCI_HCP_MSG_GET_CMD(message->header));
263 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
264
265 if (!r && skb)
266 *skb = conn_info->rx_skb;
267 }
11f54f22
CR		 268
269 return r;
270}
271EXPORT_SYMBOL(nci_hci_send_cmd);
272
fa6fbade
CR		 273int nci_hci_clear_all_pipes(struct nci_dev *ndev)
274{
275 int r;
276
277 r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
278 NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
279 if (r < 0)
280 return r;
281
282 nci_hci_reset_pipes(ndev->hci_dev);
283 return r;
284}
285EXPORT_SYMBOL(nci_hci_clear_all_pipes);
286
11f54f22
CR		 287static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
288 u8 event, struct sk_buff *skb)
289{
290 if (ndev->ops->hci_event_received)
291 ndev->ops->hci_event_received(ndev, pipe, event, skb);
292}
293
294static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
295 u8 cmd, struct sk_buff *skb)
296{
297 u8 gate = ndev->hci_dev->pipes[pipe].gate;
298 u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
299 u8 dest_gate, new_pipe;
300 struct nci_hci_create_pipe_resp *create_info;
301 struct nci_hci_delete_pipe_noti *delete_info;
302 struct nci_hci_all_pipe_cleared_noti *cleared_info;
303
304 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
305
306 switch (cmd) {
307 case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
308 if (skb->len != 5) {
309 status = NCI_HCI_ANY_E_NOK;
310 goto exit;
311 }
312 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
313 dest_gate = create_info->dest_gate;
314 new_pipe = create_info->pipe;
315
316 /* Save the new created pipe and bind with local gate,
317 * the description for skb->data[3] is destination gate id
318 * but since we received this cmd from host controller, we
319 * are the destination and it is our local gate
320 */
321 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
322 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
323 ndev->hci_dev->pipes[new_pipe].host =
324 create_info->src_host;
325 break;
326 case NCI_HCI_ANY_OPEN_PIPE:
327 /* If the pipe is not created report an error */
328 if (gate == NCI_HCI_INVALID_GATE) {
329 status = NCI_HCI_ANY_E_NOK;
330 goto exit;
331 }
332 break;
333 case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
334 if (skb->len != 1) {
335 status = NCI_HCI_ANY_E_NOK;
336 goto exit;
337 }
338 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
339
340 ndev->hci_dev->pipes[delete_info->pipe].gate =
341 NCI_HCI_INVALID_GATE;
342 ndev->hci_dev->pipes[delete_info->pipe].host =
343 NCI_HCI_INVALID_HOST;
344 break;
345 case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
346 if (skb->len != 1) {
347 status = NCI_HCI_ANY_E_NOK;
348 goto exit;
349 }
350
351 cleared_info =
352 (struct nci_hci_all_pipe_cleared_noti *)skb->data;
353 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
354 break;
355 default:
356 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
357 break;
358 }
359
360 if (ndev->ops->hci_cmd_received)
361 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
362
363exit:
364 nci_hci_send_data(ndev, pipe, status, NULL, 0);
365
366 kfree_skb(skb);
367}
368
369static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
370 u8 result, struct sk_buff *skb)
371{
372 struct nci_conn_info *conn_info;
373 u8 status = result;
374
11f54f22
CR		 375 conn_info = ndev->hci_dev->conn_info;
376 if (!conn_info) {
377 status = NCI_STATUS_REJECTED;
378 goto exit;
379 }
380
381 conn_info->rx_skb = skb;
382
383exit:
d8cd37ed 384 nci_req_complete(ndev, NCI_STATUS_OK);
11f54f22
CR		 385}
386
387/* Receive hcp message for pipe, with type and cmd.
388 * skb contains optional message data only.
389 */
390static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
391 u8 type, u8 instruction, struct sk_buff *skb)
392{
393 switch (type) {
394 case NCI_HCI_HCP_RESPONSE:
395 nci_hci_resp_received(ndev, pipe, instruction, skb);
396 break;
397 case NCI_HCI_HCP_COMMAND:
398 nci_hci_cmd_received(ndev, pipe, instruction, skb);
399 break;
400 case NCI_HCI_HCP_EVENT:
401 nci_hci_event_received(ndev, pipe, instruction, skb);
402 break;
403 default:
404 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
405 type, instruction);
406 kfree_skb(skb);
407 break;
408 }
409
064d0047 410 nci_req_complete(ndev, NCI_STATUS_OK);
11f54f22
CR		 411}
412
413static void nci_hci_msg_rx_work(struct work_struct *work)
414{
415 struct nci_hci_dev *hdev =
416 container_of(work, struct nci_hci_dev, msg_rx_work);
417 struct sk_buff *skb;
418 struct nci_hcp_message *message;
419 u8 pipe, type, instruction;
420
421 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
e65917b6 422 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
11f54f22
CR		 423 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
424 message = (struct nci_hcp_message *)skb->data;
425 type = NCI_HCP_MSG_GET_TYPE(message->header);
426 instruction = NCI_HCP_MSG_GET_CMD(message->header);
427 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
428
429 nci_hci_hcp_message_rx(hdev->ndev, pipe,
430 type, instruction, skb);
431 }
432}
433
434void nci_hci_data_received_cb(void *context,
435 struct sk_buff *skb, int err)
436{
437 struct nci_dev *ndev = (struct nci_dev *)context;
438 struct nci_hcp_packet *packet;
d8cd37ed 439 u8 pipe, type;
11f54f22
CR		 440 struct sk_buff *hcp_skb;
441 struct sk_buff *frag_skb;
442 int msg_len;
443
444 pr_debug("\n");
445
446 if (err) {
447 nci_req_complete(ndev, err);
448 return;
449 }
450
451 packet = (struct nci_hcp_packet *)skb->data;
452 if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
453 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
454 return;
455 }
456
457 /* it's the last fragment. Does it need re-aggregation? */
458 if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
e65917b6 459 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
11f54f22
CR		 460 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
461
462 msg_len = 0;
463 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
464 msg_len += (frag_skb->len -
465 NCI_HCI_HCP_PACKET_HEADER_LEN);
466 }
467
468 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
469 msg_len, GFP_KERNEL);
470 if (!hcp_skb) {
471 nci_req_complete(ndev, -ENOMEM);
472 return;
473 }
474
4df864c1 475 *(u8 *)skb_put(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN) = pipe;
11f54f22
CR		 476
477 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
d8cd37ed 478 msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
59ae1d12
JB		 479 skb_put_data(hcp_skb,
480 frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
481 msg_len);
11f54f22
CR		 482 }
483
484 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
485 } else {
486 packet->header &= NCI_HCI_FRAGMENT;
487 hcp_skb = skb;
488 }
489
490 /* if this is a response, dispatch immediately to
491 * unblock waiting cmd context. Otherwise, enqueue to dispatch
492 * in separate context where handler can also execute command.
493 */
494 packet = (struct nci_hcp_packet *)hcp_skb->data;
495 type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
496 if (type == NCI_HCI_HCP_RESPONSE) {
d8cd37ed
CR		 497 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
498 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
499 nci_hci_hcp_message_rx(ndev, pipe, type,
500 NCI_STATUS_OK, hcp_skb);
11f54f22
CR		 501 } else {
502 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
503 schedule_work(&ndev->hci_dev->msg_rx_work);
504 }
505}
506
507int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
508{
509 struct nci_data data;
510 struct nci_conn_info *conn_info;
511
512 conn_info = ndev->hci_dev->conn_info;
513 if (!conn_info)
514 return -EPROTO;
515
516 data.conn_id = conn_info->conn_id;
517 data.pipe = pipe;
518 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
519 NCI_HCI_ANY_OPEN_PIPE);
520 data.data = NULL;
521 data.data_len = 0;
522
523 return nci_request(ndev, nci_hci_send_data_req,
524 (unsigned long)&data,
525 msecs_to_jiffies(NCI_DATA_TIMEOUT));
526}
527EXPORT_SYMBOL(nci_hci_open_pipe);
528
a1b0b941
CR		 529static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
530 u8 dest_gate, int *result)
531{
532 u8 pipe;
533 struct sk_buff *skb;
534 struct nci_hci_create_pipe_params params;
535 struct nci_hci_create_pipe_resp *resp;
536
537 pr_debug("gate=%d\n", dest_gate);
538
539 params.src_gate = NCI_HCI_ADMIN_GATE;
540 params.dest_host = dest_host;
541 params.dest_gate = dest_gate;
542
543 *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
544 NCI_HCI_ADM_CREATE_PIPE,
545 (u8 *)&params, sizeof(params), &skb);
546 if (*result < 0)
547 return NCI_HCI_INVALID_PIPE;
548
549 resp = (struct nci_hci_create_pipe_resp *)skb->data;
550 pipe = resp->pipe;
551 kfree_skb(skb);
552
553 pr_debug("pipe created=%d\n", pipe);
554
555 return pipe;
556}
557
558static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
559{
560 pr_debug("\n");
561
562 return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
563 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
564}
565
11f54f22
CR		 566int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
567 const u8 *param, size_t param_len)
568{
d8cd37ed 569 struct nci_hcp_message *message;
11f54f22
CR		 570 struct nci_conn_info *conn_info;
571 struct nci_data data;
572 int r;
573 u8 *tmp;
574 u8 pipe = ndev->hci_dev->gate2pipe[gate];
575
576 pr_debug("idx=%d to gate %d\n", idx, gate);
577
578 if (pipe == NCI_HCI_INVALID_PIPE)
579 return -EADDRNOTAVAIL;
580
581 conn_info = ndev->hci_dev->conn_info;
582 if (!conn_info)
583 return -EPROTO;
584
585 tmp = kmalloc(1 + param_len, GFP_KERNEL);
586 if (!tmp)
587 return -ENOMEM;
588
589 *tmp = idx;
590 memcpy(tmp + 1, param, param_len);
591
592 data.conn_id = conn_info->conn_id;
593 data.pipe = pipe;
594 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
595 NCI_HCI_ANY_SET_PARAMETER);
596 data.data = tmp;
597 data.data_len = param_len + 1;
598
599 r = nci_request(ndev, nci_hci_send_data_req,
600 (unsigned long)&data,
601 msecs_to_jiffies(NCI_DATA_TIMEOUT));
d8cd37ed
CR		 602 if (r == NCI_STATUS_OK) {
603 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
604 r = nci_hci_result_to_errno(
605 NCI_HCP_MSG_GET_CMD(message->header));
606 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
607 }
11f54f22
CR		 608
609 kfree(tmp);
610 return r;
611}
612EXPORT_SYMBOL(nci_hci_set_param);
613
614int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
615 struct sk_buff **skb)
616{
d8cd37ed 617 struct nci_hcp_message *message;
11f54f22
CR		 618 struct nci_conn_info *conn_info;
619 struct nci_data data;
620 int r;
621 u8 pipe = ndev->hci_dev->gate2pipe[gate];
622
623 pr_debug("idx=%d to gate %d\n", idx, gate);
624
625 if (pipe == NCI_HCI_INVALID_PIPE)
626 return -EADDRNOTAVAIL;
627
628 conn_info = ndev->hci_dev->conn_info;
629 if (!conn_info)
630 return -EPROTO;
631
632 data.conn_id = conn_info->conn_id;
633 data.pipe = pipe;
634 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
635 NCI_HCI_ANY_GET_PARAMETER);
636 data.data = &idx;
637 data.data_len = 1;
638
639 r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
640 msecs_to_jiffies(NCI_DATA_TIMEOUT));
641
d8cd37ed
CR		 642 if (r == NCI_STATUS_OK) {
643 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
644 r = nci_hci_result_to_errno(
645 NCI_HCP_MSG_GET_CMD(message->header));
646 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
647
648 if (!r && skb)
649 *skb = conn_info->rx_skb;
650 }
11f54f22
CR		 651
652 return r;
653}
654EXPORT_SYMBOL(nci_hci_get_param);
655
656int nci_hci_connect_gate(struct nci_dev *ndev,
657 u8 dest_host, u8 dest_gate, u8 pipe)
658{
a1b0b941 659 bool pipe_created = false;
11f54f22
CR		 660 int r;
661
662 if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
663 return 0;
664
665 if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
666 return -EADDRINUSE;
667
668 if (pipe != NCI_HCI_INVALID_PIPE)
669 goto open_pipe;
670
671 switch (dest_gate) {
672 case NCI_HCI_LINK_MGMT_GATE:
673 pipe = NCI_HCI_LINK_MGMT_PIPE;
674 break;
675 case NCI_HCI_ADMIN_GATE:
676 pipe = NCI_HCI_ADMIN_PIPE;
677 break;
a1b0b941
CR		 678 default:
679 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
2a84193f 680 if (pipe == NCI_HCI_INVALID_PIPE)
a1b0b941
CR		 681 return r;
682 pipe_created = true;
683 break;
11f54f22
CR		 684 }
685
686open_pipe:
687 r = nci_hci_open_pipe(ndev, pipe);
a1b0b941
CR		 688 if (r < 0) {
689 if (pipe_created) {
690 if (nci_hci_delete_pipe(ndev, pipe) < 0) {
691 /* TODO: Cannot clean by deleting pipe...
692 * -> inconsistent state
693 */
694 }
695 }
11f54f22 696 return r;
a1b0b941 697 }
11f54f22
CR		 698
699 ndev->hci_dev->pipes[pipe].gate = dest_gate;
700 ndev->hci_dev->pipes[pipe].host = dest_host;
701 ndev->hci_dev->gate2pipe[dest_gate] = pipe;
702
703 return 0;
704}
705EXPORT_SYMBOL(nci_hci_connect_gate);
706
707static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
708 u8 gate_count,
709 struct nci_hci_gate *gates)
710{
711 int r;
712
713 while (gate_count--) {
714 r = nci_hci_connect_gate(ndev, gates->dest_host,
715 gates->gate, gates->pipe);
716 if (r < 0)
717 return r;
718 gates++;
719 }
720
721 return 0;
722}
723
724int nci_hci_dev_session_init(struct nci_dev *ndev)
725{
15d4a8da 726 struct nci_conn_info *conn_info;
11f54f22
CR		 727 struct sk_buff *skb;
728 int r;
729
730 ndev->hci_dev->count_pipes = 0;
731 ndev->hci_dev->expected_pipes = 0;
732
15d4a8da
CR		 733 conn_info = ndev->hci_dev->conn_info;
734 if (!conn_info)
735 return -EPROTO;
736
737 conn_info->data_exchange_cb = nci_hci_data_received_cb;
738 conn_info->data_exchange_cb_context = ndev;
739
11f54f22
CR		 740 nci_hci_reset_pipes(ndev->hci_dev);
741
742 if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
743 return -EPROTO;
744
745 r = nci_hci_connect_gate(ndev,
746 ndev->hci_dev->init_data.gates[0].dest_host,
747 ndev->hci_dev->init_data.gates[0].gate,
748 ndev->hci_dev->init_data.gates[0].pipe);
749 if (r < 0)
2622e2a0 750 return r;
11f54f22
CR		 751
752 r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
753 NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
754 if (r < 0)
2622e2a0 755 return r;
11f54f22
CR		 756
757 if (skb->len &&
758 skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
2622e2a0 759 !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
11f54f22
CR		 760 ndev->ops->hci_load_session) {
761 /* Restore gate<->pipe table from some proprietary location. */
762 r = ndev->ops->hci_load_session(ndev);
11f54f22 763 } else {
8a49943f
CR		 764 r = nci_hci_clear_all_pipes(ndev);
765 if (r < 0)
766 goto exit;
767
11f54f22
CR		 768 r = nci_hci_dev_connect_gates(ndev,
769 ndev->hci_dev->init_data.gate_count,
770 ndev->hci_dev->init_data.gates);
771 if (r < 0)
772 goto exit;
773
774 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
775 NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
776 ndev->hci_dev->init_data.session_id,
777 strlen(ndev->hci_dev->init_data.session_id));
778 }
11f54f22
CR		 779
780exit:
781 kfree_skb(skb);
782
783 return r;
784}
785EXPORT_SYMBOL(nci_hci_dev_session_init);
786
787struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
788{
789 struct nci_hci_dev *hdev;
790
791 hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
792 if (!hdev)
793 return NULL;
794
795 skb_queue_head_init(&hdev->rx_hcp_frags);
796 INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
797 skb_queue_head_init(&hdev->msg_rx_queue);
798 hdev->ndev = ndev;
799
800 return hdev;
801}
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