networking: add and use skb_put_u8()
[sfrench/cifs-2.6.git] / net / nfc / nci / hci.c
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
30 struct nci_data {
31         u8              conn_id;
32         u8              pipe;
33         u8              cmd;
34         const u8        *data;
35         u32             data_len;
36 } __packed;
37
38 struct nci_hci_create_pipe_params {
39         u8 src_gate;
40         u8 dest_host;
41         u8 dest_gate;
42 } __packed;
43
44 struct 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
52 struct nci_hci_delete_pipe_noti {
53         u8 pipe;
54 } __packed;
55
56 struct nci_hci_all_pipe_cleared_noti {
57         u8 host;
58 } __packed;
59
60 struct nci_hcp_message {
61         u8 header;      /* type -cmd,evt,rsp- + instruction */
62         u8 data[];
63 } __packed;
64
65 struct 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
73 #define NCI_HCI_ADM_CLEAR_ALL_PIPE 0x14
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
82 #define NCI_HCI_ADM_CREATE_PIPE                 0x10
83 #define NCI_HCI_ADM_DELETE_PIPE                 0x11
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
107 static 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
121 /* HCI core */
122 static 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
133 static 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  */
153 static 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
166         i = 0;
167         skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
168                             NCI_DATA_HDR_SIZE, GFP_KERNEL);
169         if (!skb)
170                 return -ENOMEM;
171
172         skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
173         *(u8 *)skb_push(skb, 1) = data_type;
174
175         do {
176                 len = conn_info->max_pkt_payload_len;
177
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
187                 *(u8 *)skb_push(skb, 1) = cb;
188
189                 if (len > 0)
190                         skb_put_data(skb, data + i, len);
191
192                 r = nci_send_data(ndev, conn_info->conn_id, skb);
193                 if (r < 0)
194                         return r;
195
196                 i += len;
197
198                 if (i < data_len) {
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);
206                 }
207         } while (i < data_len);
208
209         return i;
210 }
211
212 static 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
220 int 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 }
232 EXPORT_SYMBOL(nci_hci_send_event);
233
234 int 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 {
238         struct nci_hcp_message *message;
239         struct nci_conn_info   *conn_info;
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));
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         }
268
269         return r;
270 }
271 EXPORT_SYMBOL(nci_hci_send_cmd);
272
273 int 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 }
285 EXPORT_SYMBOL(nci_hci_clear_all_pipes);
286
287 static 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
294 static 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
363 exit:
364         nci_hci_send_data(ndev, pipe, status, NULL, 0);
365
366         kfree_skb(skb);
367 }
368
369 static 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
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
383 exit:
384         nci_req_complete(ndev, NCI_STATUS_OK);
385 }
386
387 /* Receive hcp message for pipe, with type and cmd.
388  * skb contains optional message data only.
389  */
390 static 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
410         nci_req_complete(ndev, NCI_STATUS_OK);
411 }
412
413 static 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) {
422                 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
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
434 void 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;
439         u8 pipe, type;
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)) {
459                 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
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
475                 skb_put_u8(hcp_skb, pipe);
476
477                 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
478                         msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
479                         skb_put_data(hcp_skb,
480                                      frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
481                                      msg_len);
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) {
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);
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
507 int 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 }
527 EXPORT_SYMBOL(nci_hci_open_pipe);
528
529 static 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
558 static 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
566 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
567                       const u8 *param, size_t param_len)
568 {
569         struct nci_hcp_message *message;
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));
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         }
608
609         kfree(tmp);
610         return r;
611 }
612 EXPORT_SYMBOL(nci_hci_set_param);
613
614 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
615                       struct sk_buff **skb)
616 {
617         struct nci_hcp_message *message;
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
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         }
651
652         return r;
653 }
654 EXPORT_SYMBOL(nci_hci_get_param);
655
656 int nci_hci_connect_gate(struct nci_dev *ndev,
657                          u8 dest_host, u8 dest_gate, u8 pipe)
658 {
659         bool pipe_created = false;
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;
678         default:
679                 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
680                 if (pipe == NCI_HCI_INVALID_PIPE)
681                         return r;
682                 pipe_created = true;
683                 break;
684         }
685
686 open_pipe:
687         r = nci_hci_open_pipe(ndev, pipe);
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                 }
696                 return r;
697         }
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 }
705 EXPORT_SYMBOL(nci_hci_connect_gate);
706
707 static 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
724 int nci_hci_dev_session_init(struct nci_dev *ndev)
725 {
726         struct nci_conn_info    *conn_info;
727         struct sk_buff *skb;
728         int r;
729
730         ndev->hci_dev->count_pipes = 0;
731         ndev->hci_dev->expected_pipes = 0;
732
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
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)
750                 return r;
751
752         r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
753                               NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
754         if (r < 0)
755                 return r;
756
757         if (skb->len &&
758             skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
759             !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
760             ndev->ops->hci_load_session) {
761                 /* Restore gate<->pipe table from some proprietary location. */
762                 r = ndev->ops->hci_load_session(ndev);
763         } else {
764                 r = nci_hci_clear_all_pipes(ndev);
765                 if (r < 0)
766                         goto exit;
767
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         }
779
780 exit:
781         kfree_skb(skb);
782
783         return r;
784 }
785 EXPORT_SYMBOL(nci_hci_dev_session_init);
786
787 struct 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 }