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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * The NFC Controller Interface is the communication protocol between an
4 * NFC Controller (NFCC) and a Device Host (DH).
5 * This is the HCI over NCI implementation, as specified in the 10.2
6 * section of the NCI 1.1 specification.
7 *
8 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
9 */
10
11#include <linux/skbuff.h>
12
13#include "../nfc.h"
14#include <net/nfc/nci.h>
15#include <net/nfc/nci_core.h>
16#include <linux/nfc.h>
17
18struct nci_data {
19 u8 conn_id;
20 u8 pipe;
21 u8 cmd;
22 const u8 *data;
23 u32 data_len;
24} __packed;
25
26struct nci_hci_create_pipe_params {
27 u8 src_gate;
28 u8 dest_host;
29 u8 dest_gate;
30} __packed;
31
32struct nci_hci_create_pipe_resp {
33 u8 src_host;
34 u8 src_gate;
35 u8 dest_host;
36 u8 dest_gate;
37 u8 pipe;
38} __packed;
39
40struct nci_hci_delete_pipe_noti {
41 u8 pipe;
42} __packed;
43
44struct nci_hci_all_pipe_cleared_noti {
45 u8 host;
46} __packed;
47
48struct nci_hcp_message {
49 u8 header; /* type -cmd,evt,rsp- + instruction */
50 u8 data[];
51} __packed;
52
53struct nci_hcp_packet {
54 u8 header; /* cbit+pipe */
55 struct nci_hcp_message message;
56} __packed;
57
58#define NCI_HCI_ANY_SET_PARAMETER 0x01
59#define NCI_HCI_ANY_GET_PARAMETER 0x02
60#define NCI_HCI_ANY_CLOSE_PIPE 0x04
61#define NCI_HCI_ADM_CLEAR_ALL_PIPE 0x14
62
63#define NCI_HFP_NO_CHAINING 0x80
64
65#define NCI_NFCEE_ID_HCI 0x80
66
67#define NCI_EVT_HOT_PLUG 0x03
68
69#define NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY 0x01
70#define NCI_HCI_ADM_CREATE_PIPE 0x10
71#define NCI_HCI_ADM_DELETE_PIPE 0x11
72
73/* HCP headers */
74#define NCI_HCI_HCP_PACKET_HEADER_LEN 1
75#define NCI_HCI_HCP_MESSAGE_HEADER_LEN 1
76#define NCI_HCI_HCP_HEADER_LEN 2
77
78/* HCP types */
79#define NCI_HCI_HCP_COMMAND 0x00
80#define NCI_HCI_HCP_EVENT 0x01
81#define NCI_HCI_HCP_RESPONSE 0x02
82
83#define NCI_HCI_ADM_NOTIFY_PIPE_CREATED 0x12
84#define NCI_HCI_ADM_NOTIFY_PIPE_DELETED 0x13
85#define NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
86
87#define NCI_HCI_FRAGMENT 0x7f
88#define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
89 ((instr) & 0x3f))
90
91#define NCI_HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
92#define NCI_HCP_MSG_GET_CMD(header) (header & 0x3f)
93#define NCI_HCP_MSG_GET_PIPE(header) (header & 0x7f)
94
95static int nci_hci_result_to_errno(u8 result)
96{
97 switch (result) {
98 case NCI_HCI_ANY_OK:
99 return 0;
100 case NCI_HCI_ANY_E_REG_PAR_UNKNOWN:
101 return -EOPNOTSUPP;
102 case NCI_HCI_ANY_E_TIMEOUT:
103 return -ETIME;
104 default:
105 return -1;
106 }
107}
108
109/* HCI core */
110static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
111{
112 int i;
113
114 for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
115 hdev->pipes[i].gate = NCI_HCI_INVALID_GATE;
116 hdev->pipes[i].host = NCI_HCI_INVALID_HOST;
117 }
118 memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
119}
120
121static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
122{
123 int i;
124
125 for (i = 0; i < NCI_HCI_MAX_PIPES; i++) {
126 if (ndev->hci_dev->pipes[i].host == host) {
127 ndev->hci_dev->pipes[i].gate = NCI_HCI_INVALID_GATE;
128 ndev->hci_dev->pipes[i].host = NCI_HCI_INVALID_HOST;
129 }
130 }
131}
132
133/* Fragment HCI data over NCI packet.
134 * NFC Forum NCI 10.2.2 Data Exchange:
135 * The payload of the Data Packets sent on the Logical Connection SHALL be
136 * valid HCP packets, as defined within [ETSI_102622]. Each Data Packet SHALL
137 * contain a single HCP packet. NCI Segmentation and Reassembly SHALL NOT be
138 * applied to Data Messages in either direction. The HCI fragmentation mechanism
139 * is used if required.
140 */
141static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
142 const u8 data_type, const u8 *data,
143 size_t data_len)
144{
145 struct nci_conn_info *conn_info;
146 struct sk_buff *skb;
147 int len, i, r;
148 u8 cb = pipe;
149
150 conn_info = ndev->hci_dev->conn_info;
151 if (!conn_info)
152 return -EPROTO;
153
154 i = 0;
155 skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
156 NCI_DATA_HDR_SIZE, GFP_KERNEL);
157 if (!skb)
158 return -ENOMEM;
159
160 skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
161 *(u8 *)skb_push(skb, 1) = data_type;
162
163 do {
164 /* If last packet add NCI_HFP_NO_CHAINING */
165 if (i + conn_info->max_pkt_payload_len -
166 (skb->len + 1) >= data_len) {
167 cb |= NCI_HFP_NO_CHAINING;
168 len = data_len - i;
169 } else {
170 len = conn_info->max_pkt_payload_len - skb->len - 1;
171 }
172
173 *(u8 *)skb_push(skb, 1) = cb;
174
175 if (len > 0)
176 skb_put_data(skb, data + i, len);
177
178 r = nci_send_data(ndev, conn_info->conn_id, skb);
179 if (r < 0)
180 return r;
181
182 i += len;
183
184 if (i < data_len) {
185 skb = nci_skb_alloc(ndev,
186 conn_info->max_pkt_payload_len +
187 NCI_DATA_HDR_SIZE, GFP_KERNEL);
188 if (!skb)
189 return -ENOMEM;
190
191 skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
192 }
193 } while (i < data_len);
194
195 return i;
196}
197
198static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
199{
200 struct nci_data *data = (struct nci_data *)opt;
201
202 nci_hci_send_data(ndev, data->pipe, data->cmd,
203 data->data, data->data_len);
204}
205
206int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
207 const u8 *param, size_t param_len)
208{
209 u8 pipe = ndev->hci_dev->gate2pipe[gate];
210
211 if (pipe == NCI_HCI_INVALID_PIPE)
212 return -EADDRNOTAVAIL;
213
214 return nci_hci_send_data(ndev, pipe,
215 NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
216 param, param_len);
217}
218EXPORT_SYMBOL(nci_hci_send_event);
219
220int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
221 const u8 *param, size_t param_len,
222 struct sk_buff **skb)
223{
224 struct nci_hcp_message *message;
225 struct nci_conn_info *conn_info;
226 struct nci_data data;
227 int r;
228 u8 pipe = ndev->hci_dev->gate2pipe[gate];
229
230 if (pipe == NCI_HCI_INVALID_PIPE)
231 return -EADDRNOTAVAIL;
232
233 conn_info = ndev->hci_dev->conn_info;
234 if (!conn_info)
235 return -EPROTO;
236
237 data.conn_id = conn_info->conn_id;
238 data.pipe = pipe;
239 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
240 data.data = param;
241 data.data_len = param_len;
242
243 r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
244 msecs_to_jiffies(NCI_DATA_TIMEOUT));
245 if (r == NCI_STATUS_OK) {
246 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
247 r = nci_hci_result_to_errno(
248 NCI_HCP_MSG_GET_CMD(message->header));
249 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
250
251 if (!r && skb)
252 *skb = conn_info->rx_skb;
253 }
254
255 return r;
256}
257EXPORT_SYMBOL(nci_hci_send_cmd);
258
259int nci_hci_clear_all_pipes(struct nci_dev *ndev)
260{
261 int r;
262
263 r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
264 NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
265 if (r < 0)
266 return r;
267
268 nci_hci_reset_pipes(ndev->hci_dev);
269 return r;
270}
271EXPORT_SYMBOL(nci_hci_clear_all_pipes);
272
273static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
274 u8 event, struct sk_buff *skb)
275{
276 if (ndev->ops->hci_event_received)
277 ndev->ops->hci_event_received(ndev, pipe, event, skb);
278}
279
280static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
281 u8 cmd, struct sk_buff *skb)
282{
283 u8 gate = ndev->hci_dev->pipes[pipe].gate;
284 u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
285 u8 dest_gate, new_pipe;
286 struct nci_hci_create_pipe_resp *create_info;
287 struct nci_hci_delete_pipe_noti *delete_info;
288 struct nci_hci_all_pipe_cleared_noti *cleared_info;
289
290 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
291
292 switch (cmd) {
293 case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
294 if (skb->len != 5) {
295 status = NCI_HCI_ANY_E_NOK;
296 goto exit;
297 }
298 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
299 dest_gate = create_info->dest_gate;
300 new_pipe = create_info->pipe;
301 if (new_pipe >= NCI_HCI_MAX_PIPES) {
302 status = NCI_HCI_ANY_E_NOK;
303 goto exit;
304 }
305
306 /* Save the new created pipe and bind with local gate,
307 * the description for skb->data[3] is destination gate id
308 * but since we received this cmd from host controller, we
309 * are the destination and it is our local gate
310 */
311 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
312 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
313 ndev->hci_dev->pipes[new_pipe].host =
314 create_info->src_host;
315 break;
316 case NCI_HCI_ANY_OPEN_PIPE:
317 /* If the pipe is not created report an error */
318 if (gate == NCI_HCI_INVALID_GATE) {
319 status = NCI_HCI_ANY_E_NOK;
320 goto exit;
321 }
322 break;
323 case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
324 if (skb->len != 1) {
325 status = NCI_HCI_ANY_E_NOK;
326 goto exit;
327 }
328 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
329 if (delete_info->pipe >= NCI_HCI_MAX_PIPES) {
330 status = NCI_HCI_ANY_E_NOK;
331 goto exit;
332 }
333
334 ndev->hci_dev->pipes[delete_info->pipe].gate =
335 NCI_HCI_INVALID_GATE;
336 ndev->hci_dev->pipes[delete_info->pipe].host =
337 NCI_HCI_INVALID_HOST;
338 break;
339 case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
340 if (skb->len != 1) {
341 status = NCI_HCI_ANY_E_NOK;
342 goto exit;
343 }
344
345 cleared_info =
346 (struct nci_hci_all_pipe_cleared_noti *)skb->data;
347 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
348 break;
349 default:
350 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
351 break;
352 }
353
354 if (ndev->ops->hci_cmd_received)
355 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
356
357exit:
358 nci_hci_send_data(ndev, pipe, status, NULL, 0);
359
360 kfree_skb(skb);
361}
362
363static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
364 struct sk_buff *skb)
365{
366 struct nci_conn_info *conn_info;
367
368 conn_info = ndev->hci_dev->conn_info;
369 if (!conn_info)
370 goto exit;
371
372 conn_info->rx_skb = skb;
373
374exit:
375 nci_req_complete(ndev, NCI_STATUS_OK);
376}
377
378/* Receive hcp message for pipe, with type and cmd.
379 * skb contains optional message data only.
380 */
381static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
382 u8 type, u8 instruction, struct sk_buff *skb)
383{
384 switch (type) {
385 case NCI_HCI_HCP_RESPONSE:
386 nci_hci_resp_received(ndev, pipe, skb);
387 break;
388 case NCI_HCI_HCP_COMMAND:
389 nci_hci_cmd_received(ndev, pipe, instruction, skb);
390 break;
391 case NCI_HCI_HCP_EVENT:
392 nci_hci_event_received(ndev, pipe, instruction, skb);
393 break;
394 default:
395 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
396 type, instruction);
397 kfree_skb(skb);
398 break;
399 }
400
401 nci_req_complete(ndev, NCI_STATUS_OK);
402}
403
404static void nci_hci_msg_rx_work(struct work_struct *work)
405{
406 struct nci_hci_dev *hdev =
407 container_of(work, struct nci_hci_dev, msg_rx_work);
408 struct sk_buff *skb;
409 struct nci_hcp_message *message;
410 u8 pipe, type, instruction;
411
412 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
413 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
414 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
415 message = (struct nci_hcp_message *)skb->data;
416 type = NCI_HCP_MSG_GET_TYPE(message->header);
417 instruction = NCI_HCP_MSG_GET_CMD(message->header);
418 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
419
420 nci_hci_hcp_message_rx(hdev->ndev, pipe,
421 type, instruction, skb);
422 }
423}
424
425void nci_hci_data_received_cb(void *context,
426 struct sk_buff *skb, int err)
427{
428 struct nci_dev *ndev = (struct nci_dev *)context;
429 struct nci_hcp_packet *packet;
430 u8 pipe, type;
431 struct sk_buff *hcp_skb;
432 struct sk_buff *frag_skb;
433 int msg_len;
434
435 pr_debug("\n");
436
437 if (err) {
438 nci_req_complete(ndev, err);
439 return;
440 }
441
442 packet = (struct nci_hcp_packet *)skb->data;
443 if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
444 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
445 return;
446 }
447
448 /* it's the last fragment. Does it need re-aggregation? */
449 if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
450 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
451 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
452
453 msg_len = 0;
454 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
455 msg_len += (frag_skb->len -
456 NCI_HCI_HCP_PACKET_HEADER_LEN);
457 }
458
459 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
460 msg_len, GFP_KERNEL);
461 if (!hcp_skb) {
462 nci_req_complete(ndev, -ENOMEM);
463 return;
464 }
465
466 skb_put_u8(hcp_skb, pipe);
467
468 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
469 msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
470 skb_put_data(hcp_skb,
471 frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
472 msg_len);
473 }
474
475 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
476 } else {
477 packet->header &= NCI_HCI_FRAGMENT;
478 hcp_skb = skb;
479 }
480
481 /* if this is a response, dispatch immediately to
482 * unblock waiting cmd context. Otherwise, enqueue to dispatch
483 * in separate context where handler can also execute command.
484 */
485 packet = (struct nci_hcp_packet *)hcp_skb->data;
486 type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
487 if (type == NCI_HCI_HCP_RESPONSE) {
488 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
489 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
490 nci_hci_hcp_message_rx(ndev, pipe, type,
491 NCI_STATUS_OK, hcp_skb);
492 } else {
493 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
494 schedule_work(&ndev->hci_dev->msg_rx_work);
495 }
496}
497
498int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
499{
500 struct nci_data data;
501 struct nci_conn_info *conn_info;
502
503 conn_info = ndev->hci_dev->conn_info;
504 if (!conn_info)
505 return -EPROTO;
506
507 data.conn_id = conn_info->conn_id;
508 data.pipe = pipe;
509 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
510 NCI_HCI_ANY_OPEN_PIPE);
511 data.data = NULL;
512 data.data_len = 0;
513
514 return nci_request(ndev, nci_hci_send_data_req,
515 (unsigned long)&data,
516 msecs_to_jiffies(NCI_DATA_TIMEOUT));
517}
518EXPORT_SYMBOL(nci_hci_open_pipe);
519
520static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
521 u8 dest_gate, int *result)
522{
523 u8 pipe;
524 struct sk_buff *skb;
525 struct nci_hci_create_pipe_params params;
526 struct nci_hci_create_pipe_resp *resp;
527
528 pr_debug("gate=%d\n", dest_gate);
529
530 params.src_gate = NCI_HCI_ADMIN_GATE;
531 params.dest_host = dest_host;
532 params.dest_gate = dest_gate;
533
534 *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
535 NCI_HCI_ADM_CREATE_PIPE,
536 (u8 *)¶ms, sizeof(params), &skb);
537 if (*result < 0)
538 return NCI_HCI_INVALID_PIPE;
539
540 resp = (struct nci_hci_create_pipe_resp *)skb->data;
541 pipe = resp->pipe;
542 kfree_skb(skb);
543
544 pr_debug("pipe created=%d\n", pipe);
545
546 return pipe;
547}
548
549static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
550{
551 pr_debug("\n");
552
553 return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
554 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
555}
556
557int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
558 const u8 *param, size_t param_len)
559{
560 struct nci_hcp_message *message;
561 struct nci_conn_info *conn_info;
562 struct nci_data data;
563 int r;
564 u8 *tmp;
565 u8 pipe = ndev->hci_dev->gate2pipe[gate];
566
567 pr_debug("idx=%d to gate %d\n", idx, gate);
568
569 if (pipe == NCI_HCI_INVALID_PIPE)
570 return -EADDRNOTAVAIL;
571
572 conn_info = ndev->hci_dev->conn_info;
573 if (!conn_info)
574 return -EPROTO;
575
576 tmp = kmalloc(1 + param_len, GFP_KERNEL);
577 if (!tmp)
578 return -ENOMEM;
579
580 *tmp = idx;
581 memcpy(tmp + 1, param, param_len);
582
583 data.conn_id = conn_info->conn_id;
584 data.pipe = pipe;
585 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
586 NCI_HCI_ANY_SET_PARAMETER);
587 data.data = tmp;
588 data.data_len = param_len + 1;
589
590 r = nci_request(ndev, nci_hci_send_data_req,
591 (unsigned long)&data,
592 msecs_to_jiffies(NCI_DATA_TIMEOUT));
593 if (r == NCI_STATUS_OK) {
594 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
595 r = nci_hci_result_to_errno(
596 NCI_HCP_MSG_GET_CMD(message->header));
597 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
598 }
599
600 kfree(tmp);
601 return r;
602}
603EXPORT_SYMBOL(nci_hci_set_param);
604
605int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
606 struct sk_buff **skb)
607{
608 struct nci_hcp_message *message;
609 struct nci_conn_info *conn_info;
610 struct nci_data data;
611 int r;
612 u8 pipe = ndev->hci_dev->gate2pipe[gate];
613
614 pr_debug("idx=%d to gate %d\n", idx, gate);
615
616 if (pipe == NCI_HCI_INVALID_PIPE)
617 return -EADDRNOTAVAIL;
618
619 conn_info = ndev->hci_dev->conn_info;
620 if (!conn_info)
621 return -EPROTO;
622
623 data.conn_id = conn_info->conn_id;
624 data.pipe = pipe;
625 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
626 NCI_HCI_ANY_GET_PARAMETER);
627 data.data = &idx;
628 data.data_len = 1;
629
630 r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
631 msecs_to_jiffies(NCI_DATA_TIMEOUT));
632
633 if (r == NCI_STATUS_OK) {
634 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
635 r = nci_hci_result_to_errno(
636 NCI_HCP_MSG_GET_CMD(message->header));
637 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
638
639 if (!r && skb)
640 *skb = conn_info->rx_skb;
641 }
642
643 return r;
644}
645EXPORT_SYMBOL(nci_hci_get_param);
646
647int nci_hci_connect_gate(struct nci_dev *ndev,
648 u8 dest_host, u8 dest_gate, u8 pipe)
649{
650 bool pipe_created = false;
651 int r;
652
653 if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
654 return 0;
655
656 if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
657 return -EADDRINUSE;
658
659 if (pipe != NCI_HCI_INVALID_PIPE)
660 goto open_pipe;
661
662 switch (dest_gate) {
663 case NCI_HCI_LINK_MGMT_GATE:
664 pipe = NCI_HCI_LINK_MGMT_PIPE;
665 break;
666 case NCI_HCI_ADMIN_GATE:
667 pipe = NCI_HCI_ADMIN_PIPE;
668 break;
669 default:
670 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
671 if (pipe == NCI_HCI_INVALID_PIPE)
672 return r;
673 pipe_created = true;
674 break;
675 }
676
677open_pipe:
678 r = nci_hci_open_pipe(ndev, pipe);
679 if (r < 0) {
680 if (pipe_created) {
681 if (nci_hci_delete_pipe(ndev, pipe) < 0) {
682 /* TODO: Cannot clean by deleting pipe...
683 * -> inconsistent state
684 */
685 }
686 }
687 return r;
688 }
689
690 ndev->hci_dev->pipes[pipe].gate = dest_gate;
691 ndev->hci_dev->pipes[pipe].host = dest_host;
692 ndev->hci_dev->gate2pipe[dest_gate] = pipe;
693
694 return 0;
695}
696EXPORT_SYMBOL(nci_hci_connect_gate);
697
698static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
699 u8 gate_count,
700 struct nci_hci_gate *gates)
701{
702 int r;
703
704 while (gate_count--) {
705 r = nci_hci_connect_gate(ndev, gates->dest_host,
706 gates->gate, gates->pipe);
707 if (r < 0)
708 return r;
709 gates++;
710 }
711
712 return 0;
713}
714
715int nci_hci_dev_session_init(struct nci_dev *ndev)
716{
717 struct nci_conn_info *conn_info;
718 struct sk_buff *skb;
719 int r;
720
721 ndev->hci_dev->count_pipes = 0;
722 ndev->hci_dev->expected_pipes = 0;
723
724 conn_info = ndev->hci_dev->conn_info;
725 if (!conn_info)
726 return -EPROTO;
727
728 conn_info->data_exchange_cb = nci_hci_data_received_cb;
729 conn_info->data_exchange_cb_context = ndev;
730
731 nci_hci_reset_pipes(ndev->hci_dev);
732
733 if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
734 return -EPROTO;
735
736 r = nci_hci_connect_gate(ndev,
737 ndev->hci_dev->init_data.gates[0].dest_host,
738 ndev->hci_dev->init_data.gates[0].gate,
739 ndev->hci_dev->init_data.gates[0].pipe);
740 if (r < 0)
741 return r;
742
743 r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
744 NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
745 if (r < 0)
746 return r;
747
748 if (skb->len &&
749 skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
750 !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
751 ndev->ops->hci_load_session) {
752 /* Restore gate<->pipe table from some proprietary location. */
753 r = ndev->ops->hci_load_session(ndev);
754 } else {
755 r = nci_hci_clear_all_pipes(ndev);
756 if (r < 0)
757 goto exit;
758
759 r = nci_hci_dev_connect_gates(ndev,
760 ndev->hci_dev->init_data.gate_count,
761 ndev->hci_dev->init_data.gates);
762 if (r < 0)
763 goto exit;
764
765 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
766 NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
767 ndev->hci_dev->init_data.session_id,
768 strlen(ndev->hci_dev->init_data.session_id));
769 }
770
771exit:
772 kfree_skb(skb);
773
774 return r;
775}
776EXPORT_SYMBOL(nci_hci_dev_session_init);
777
778struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
779{
780 struct nci_hci_dev *hdev;
781
782 hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
783 if (!hdev)
784 return NULL;
785
786 skb_queue_head_init(&hdev->rx_hcp_frags);
787 INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
788 skb_queue_head_init(&hdev->msg_rx_queue);
789 hdev->ndev = ndev;
790
791 return hdev;
792}
793
794void nci_hci_deallocate(struct nci_dev *ndev)
795{
796 kfree(ndev->hci_dev);
797}