1 // SPDX-License-Identifier: GPL-2.0-only
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.
8 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
11 #include <linux/skbuff.h>
14 #include <net/nfc/nci.h>
15 #include <net/nfc/nci_core.h>
16 #include <linux/nfc.h>
26 struct nci_hci_create_pipe_params {
32 struct nci_hci_create_pipe_resp {
40 struct nci_hci_delete_pipe_noti {
44 struct nci_hci_all_pipe_cleared_noti {
48 struct nci_hcp_message {
49 u8 header; /* type -cmd,evt,rsp- + instruction */
53 struct nci_hcp_packet {
54 u8 header; /* cbit+pipe */
55 struct nci_hcp_message message;
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
63 #define NCI_HFP_NO_CHAINING 0x80
65 #define NCI_NFCEE_ID_HCI 0x80
67 #define NCI_EVT_HOT_PLUG 0x03
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
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
79 #define NCI_HCI_HCP_COMMAND 0x00
80 #define NCI_HCI_HCP_EVENT 0x01
81 #define NCI_HCI_HCP_RESPONSE 0x02
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
87 #define NCI_HCI_FRAGMENT 0x7f
88 #define NCI_HCP_HEADER(type, instr) ((((type) & 0x03) << 6) |\
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)
95 static int nci_hci_result_to_errno(u8 result)
100 case NCI_HCI_ANY_E_REG_PAR_UNKNOWN:
102 case NCI_HCI_ANY_E_TIMEOUT:
110 static void nci_hci_reset_pipes(struct nci_hci_dev *hdev)
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;
118 memset(hdev->gate2pipe, NCI_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
121 static void nci_hci_reset_pipes_per_host(struct nci_dev *ndev, u8 host)
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;
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.
141 static int nci_hci_send_data(struct nci_dev *ndev, u8 pipe,
142 const u8 data_type, const u8 *data,
145 struct nci_conn_info *conn_info;
150 conn_info = ndev->hci_dev->conn_info;
155 skb = nci_skb_alloc(ndev, conn_info->max_pkt_payload_len +
156 NCI_DATA_HDR_SIZE, GFP_ATOMIC);
160 skb_reserve(skb, NCI_DATA_HDR_SIZE + 2);
161 *(u8 *)skb_push(skb, 1) = data_type;
164 len = conn_info->max_pkt_payload_len;
166 /* If last packet add NCI_HFP_NO_CHAINING */
167 if (i + conn_info->max_pkt_payload_len -
168 (skb->len + 1) >= data_len) {
169 cb |= NCI_HFP_NO_CHAINING;
172 len = conn_info->max_pkt_payload_len - skb->len - 1;
175 *(u8 *)skb_push(skb, 1) = cb;
178 skb_put_data(skb, data + i, len);
180 r = nci_send_data(ndev, conn_info->conn_id, skb);
187 skb = nci_skb_alloc(ndev,
188 conn_info->max_pkt_payload_len +
189 NCI_DATA_HDR_SIZE, GFP_ATOMIC);
193 skb_reserve(skb, NCI_DATA_HDR_SIZE + 1);
195 } while (i < data_len);
200 static void nci_hci_send_data_req(struct nci_dev *ndev, unsigned long opt)
202 struct nci_data *data = (struct nci_data *)opt;
204 nci_hci_send_data(ndev, data->pipe, data->cmd,
205 data->data, data->data_len);
208 int nci_hci_send_event(struct nci_dev *ndev, u8 gate, u8 event,
209 const u8 *param, size_t param_len)
211 u8 pipe = ndev->hci_dev->gate2pipe[gate];
213 if (pipe == NCI_HCI_INVALID_PIPE)
214 return -EADDRNOTAVAIL;
216 return nci_hci_send_data(ndev, pipe,
217 NCI_HCP_HEADER(NCI_HCI_HCP_EVENT, event),
220 EXPORT_SYMBOL(nci_hci_send_event);
222 int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
223 const u8 *param, size_t param_len,
224 struct sk_buff **skb)
226 struct nci_hcp_message *message;
227 struct nci_conn_info *conn_info;
228 struct nci_data data;
230 u8 pipe = ndev->hci_dev->gate2pipe[gate];
232 if (pipe == NCI_HCI_INVALID_PIPE)
233 return -EADDRNOTAVAIL;
235 conn_info = ndev->hci_dev->conn_info;
239 data.conn_id = conn_info->conn_id;
241 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND, cmd);
243 data.data_len = param_len;
245 r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
246 msecs_to_jiffies(NCI_DATA_TIMEOUT));
247 if (r == NCI_STATUS_OK) {
248 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
249 r = nci_hci_result_to_errno(
250 NCI_HCP_MSG_GET_CMD(message->header));
251 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
254 *skb = conn_info->rx_skb;
259 EXPORT_SYMBOL(nci_hci_send_cmd);
261 int nci_hci_clear_all_pipes(struct nci_dev *ndev)
265 r = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
266 NCI_HCI_ADM_CLEAR_ALL_PIPE, NULL, 0, NULL);
270 nci_hci_reset_pipes(ndev->hci_dev);
273 EXPORT_SYMBOL(nci_hci_clear_all_pipes);
275 static void nci_hci_event_received(struct nci_dev *ndev, u8 pipe,
276 u8 event, struct sk_buff *skb)
278 if (ndev->ops->hci_event_received)
279 ndev->ops->hci_event_received(ndev, pipe, event, skb);
282 static void nci_hci_cmd_received(struct nci_dev *ndev, u8 pipe,
283 u8 cmd, struct sk_buff *skb)
285 u8 gate = ndev->hci_dev->pipes[pipe].gate;
286 u8 status = NCI_HCI_ANY_OK | ~NCI_HCI_FRAGMENT;
287 u8 dest_gate, new_pipe;
288 struct nci_hci_create_pipe_resp *create_info;
289 struct nci_hci_delete_pipe_noti *delete_info;
290 struct nci_hci_all_pipe_cleared_noti *cleared_info;
292 pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
295 case NCI_HCI_ADM_NOTIFY_PIPE_CREATED:
297 status = NCI_HCI_ANY_E_NOK;
300 create_info = (struct nci_hci_create_pipe_resp *)skb->data;
301 dest_gate = create_info->dest_gate;
302 new_pipe = create_info->pipe;
303 if (new_pipe >= NCI_HCI_MAX_PIPES) {
304 status = NCI_HCI_ANY_E_NOK;
308 /* Save the new created pipe and bind with local gate,
309 * the description for skb->data[3] is destination gate id
310 * but since we received this cmd from host controller, we
311 * are the destination and it is our local gate
313 ndev->hci_dev->gate2pipe[dest_gate] = new_pipe;
314 ndev->hci_dev->pipes[new_pipe].gate = dest_gate;
315 ndev->hci_dev->pipes[new_pipe].host =
316 create_info->src_host;
318 case NCI_HCI_ANY_OPEN_PIPE:
319 /* If the pipe is not created report an error */
320 if (gate == NCI_HCI_INVALID_GATE) {
321 status = NCI_HCI_ANY_E_NOK;
325 case NCI_HCI_ADM_NOTIFY_PIPE_DELETED:
327 status = NCI_HCI_ANY_E_NOK;
330 delete_info = (struct nci_hci_delete_pipe_noti *)skb->data;
331 if (delete_info->pipe >= NCI_HCI_MAX_PIPES) {
332 status = NCI_HCI_ANY_E_NOK;
336 ndev->hci_dev->pipes[delete_info->pipe].gate =
337 NCI_HCI_INVALID_GATE;
338 ndev->hci_dev->pipes[delete_info->pipe].host =
339 NCI_HCI_INVALID_HOST;
341 case NCI_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
343 status = NCI_HCI_ANY_E_NOK;
348 (struct nci_hci_all_pipe_cleared_noti *)skb->data;
349 nci_hci_reset_pipes_per_host(ndev, cleared_info->host);
352 pr_debug("Discarded unknown cmd %x to gate %x\n", cmd, gate);
356 if (ndev->ops->hci_cmd_received)
357 ndev->ops->hci_cmd_received(ndev, pipe, cmd, skb);
360 nci_hci_send_data(ndev, pipe, status, NULL, 0);
365 static void nci_hci_resp_received(struct nci_dev *ndev, u8 pipe,
366 u8 result, struct sk_buff *skb)
368 struct nci_conn_info *conn_info;
371 conn_info = ndev->hci_dev->conn_info;
373 status = NCI_STATUS_REJECTED;
377 conn_info->rx_skb = skb;
380 nci_req_complete(ndev, NCI_STATUS_OK);
383 /* Receive hcp message for pipe, with type and cmd.
384 * skb contains optional message data only.
386 static void nci_hci_hcp_message_rx(struct nci_dev *ndev, u8 pipe,
387 u8 type, u8 instruction, struct sk_buff *skb)
390 case NCI_HCI_HCP_RESPONSE:
391 nci_hci_resp_received(ndev, pipe, instruction, skb);
393 case NCI_HCI_HCP_COMMAND:
394 nci_hci_cmd_received(ndev, pipe, instruction, skb);
396 case NCI_HCI_HCP_EVENT:
397 nci_hci_event_received(ndev, pipe, instruction, skb);
400 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
406 nci_req_complete(ndev, NCI_STATUS_OK);
409 static void nci_hci_msg_rx_work(struct work_struct *work)
411 struct nci_hci_dev *hdev =
412 container_of(work, struct nci_hci_dev, msg_rx_work);
414 struct nci_hcp_message *message;
415 u8 pipe, type, instruction;
417 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
418 pipe = NCI_HCP_MSG_GET_PIPE(skb->data[0]);
419 skb_pull(skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
420 message = (struct nci_hcp_message *)skb->data;
421 type = NCI_HCP_MSG_GET_TYPE(message->header);
422 instruction = NCI_HCP_MSG_GET_CMD(message->header);
423 skb_pull(skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
425 nci_hci_hcp_message_rx(hdev->ndev, pipe,
426 type, instruction, skb);
430 void nci_hci_data_received_cb(void *context,
431 struct sk_buff *skb, int err)
433 struct nci_dev *ndev = (struct nci_dev *)context;
434 struct nci_hcp_packet *packet;
436 struct sk_buff *hcp_skb;
437 struct sk_buff *frag_skb;
443 nci_req_complete(ndev, err);
447 packet = (struct nci_hcp_packet *)skb->data;
448 if ((packet->header & ~NCI_HCI_FRAGMENT) == 0) {
449 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
453 /* it's the last fragment. Does it need re-aggregation? */
454 if (skb_queue_len(&ndev->hci_dev->rx_hcp_frags)) {
455 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
456 skb_queue_tail(&ndev->hci_dev->rx_hcp_frags, skb);
459 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
460 msg_len += (frag_skb->len -
461 NCI_HCI_HCP_PACKET_HEADER_LEN);
464 hcp_skb = nfc_alloc_recv_skb(NCI_HCI_HCP_PACKET_HEADER_LEN +
465 msg_len, GFP_KERNEL);
467 nci_req_complete(ndev, -ENOMEM);
471 skb_put_u8(hcp_skb, pipe);
473 skb_queue_walk(&ndev->hci_dev->rx_hcp_frags, frag_skb) {
474 msg_len = frag_skb->len - NCI_HCI_HCP_PACKET_HEADER_LEN;
475 skb_put_data(hcp_skb,
476 frag_skb->data + NCI_HCI_HCP_PACKET_HEADER_LEN,
480 skb_queue_purge(&ndev->hci_dev->rx_hcp_frags);
482 packet->header &= NCI_HCI_FRAGMENT;
486 /* if this is a response, dispatch immediately to
487 * unblock waiting cmd context. Otherwise, enqueue to dispatch
488 * in separate context where handler can also execute command.
490 packet = (struct nci_hcp_packet *)hcp_skb->data;
491 type = NCI_HCP_MSG_GET_TYPE(packet->message.header);
492 if (type == NCI_HCI_HCP_RESPONSE) {
493 pipe = NCI_HCP_MSG_GET_PIPE(packet->header);
494 skb_pull(hcp_skb, NCI_HCI_HCP_PACKET_HEADER_LEN);
495 nci_hci_hcp_message_rx(ndev, pipe, type,
496 NCI_STATUS_OK, hcp_skb);
498 skb_queue_tail(&ndev->hci_dev->msg_rx_queue, hcp_skb);
499 schedule_work(&ndev->hci_dev->msg_rx_work);
503 int nci_hci_open_pipe(struct nci_dev *ndev, u8 pipe)
505 struct nci_data data;
506 struct nci_conn_info *conn_info;
508 conn_info = ndev->hci_dev->conn_info;
512 data.conn_id = conn_info->conn_id;
514 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
515 NCI_HCI_ANY_OPEN_PIPE);
519 return nci_request(ndev, nci_hci_send_data_req,
520 (unsigned long)&data,
521 msecs_to_jiffies(NCI_DATA_TIMEOUT));
523 EXPORT_SYMBOL(nci_hci_open_pipe);
525 static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
526 u8 dest_gate, int *result)
530 struct nci_hci_create_pipe_params params;
531 struct nci_hci_create_pipe_resp *resp;
533 pr_debug("gate=%d\n", dest_gate);
535 params.src_gate = NCI_HCI_ADMIN_GATE;
536 params.dest_host = dest_host;
537 params.dest_gate = dest_gate;
539 *result = nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
540 NCI_HCI_ADM_CREATE_PIPE,
541 (u8 *)¶ms, sizeof(params), &skb);
543 return NCI_HCI_INVALID_PIPE;
545 resp = (struct nci_hci_create_pipe_resp *)skb->data;
549 pr_debug("pipe created=%d\n", pipe);
554 static int nci_hci_delete_pipe(struct nci_dev *ndev, u8 pipe)
558 return nci_hci_send_cmd(ndev, NCI_HCI_ADMIN_GATE,
559 NCI_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
562 int nci_hci_set_param(struct nci_dev *ndev, u8 gate, u8 idx,
563 const u8 *param, size_t param_len)
565 struct nci_hcp_message *message;
566 struct nci_conn_info *conn_info;
567 struct nci_data data;
570 u8 pipe = ndev->hci_dev->gate2pipe[gate];
572 pr_debug("idx=%d to gate %d\n", idx, gate);
574 if (pipe == NCI_HCI_INVALID_PIPE)
575 return -EADDRNOTAVAIL;
577 conn_info = ndev->hci_dev->conn_info;
581 tmp = kmalloc(1 + param_len, GFP_KERNEL);
586 memcpy(tmp + 1, param, param_len);
588 data.conn_id = conn_info->conn_id;
590 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
591 NCI_HCI_ANY_SET_PARAMETER);
593 data.data_len = param_len + 1;
595 r = nci_request(ndev, nci_hci_send_data_req,
596 (unsigned long)&data,
597 msecs_to_jiffies(NCI_DATA_TIMEOUT));
598 if (r == NCI_STATUS_OK) {
599 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
600 r = nci_hci_result_to_errno(
601 NCI_HCP_MSG_GET_CMD(message->header));
602 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
608 EXPORT_SYMBOL(nci_hci_set_param);
610 int nci_hci_get_param(struct nci_dev *ndev, u8 gate, u8 idx,
611 struct sk_buff **skb)
613 struct nci_hcp_message *message;
614 struct nci_conn_info *conn_info;
615 struct nci_data data;
617 u8 pipe = ndev->hci_dev->gate2pipe[gate];
619 pr_debug("idx=%d to gate %d\n", idx, gate);
621 if (pipe == NCI_HCI_INVALID_PIPE)
622 return -EADDRNOTAVAIL;
624 conn_info = ndev->hci_dev->conn_info;
628 data.conn_id = conn_info->conn_id;
630 data.cmd = NCI_HCP_HEADER(NCI_HCI_HCP_COMMAND,
631 NCI_HCI_ANY_GET_PARAMETER);
635 r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
636 msecs_to_jiffies(NCI_DATA_TIMEOUT));
638 if (r == NCI_STATUS_OK) {
639 message = (struct nci_hcp_message *)conn_info->rx_skb->data;
640 r = nci_hci_result_to_errno(
641 NCI_HCP_MSG_GET_CMD(message->header));
642 skb_pull(conn_info->rx_skb, NCI_HCI_HCP_MESSAGE_HEADER_LEN);
645 *skb = conn_info->rx_skb;
650 EXPORT_SYMBOL(nci_hci_get_param);
652 int nci_hci_connect_gate(struct nci_dev *ndev,
653 u8 dest_host, u8 dest_gate, u8 pipe)
655 bool pipe_created = false;
658 if (pipe == NCI_HCI_DO_NOT_OPEN_PIPE)
661 if (ndev->hci_dev->gate2pipe[dest_gate] != NCI_HCI_INVALID_PIPE)
664 if (pipe != NCI_HCI_INVALID_PIPE)
668 case NCI_HCI_LINK_MGMT_GATE:
669 pipe = NCI_HCI_LINK_MGMT_PIPE;
671 case NCI_HCI_ADMIN_GATE:
672 pipe = NCI_HCI_ADMIN_PIPE;
675 pipe = nci_hci_create_pipe(ndev, dest_host, dest_gate, &r);
676 if (pipe == NCI_HCI_INVALID_PIPE)
683 r = nci_hci_open_pipe(ndev, pipe);
686 if (nci_hci_delete_pipe(ndev, pipe) < 0) {
687 /* TODO: Cannot clean by deleting pipe...
688 * -> inconsistent state
695 ndev->hci_dev->pipes[pipe].gate = dest_gate;
696 ndev->hci_dev->pipes[pipe].host = dest_host;
697 ndev->hci_dev->gate2pipe[dest_gate] = pipe;
701 EXPORT_SYMBOL(nci_hci_connect_gate);
703 static int nci_hci_dev_connect_gates(struct nci_dev *ndev,
705 struct nci_hci_gate *gates)
709 while (gate_count--) {
710 r = nci_hci_connect_gate(ndev, gates->dest_host,
711 gates->gate, gates->pipe);
720 int nci_hci_dev_session_init(struct nci_dev *ndev)
722 struct nci_conn_info *conn_info;
726 ndev->hci_dev->count_pipes = 0;
727 ndev->hci_dev->expected_pipes = 0;
729 conn_info = ndev->hci_dev->conn_info;
733 conn_info->data_exchange_cb = nci_hci_data_received_cb;
734 conn_info->data_exchange_cb_context = ndev;
736 nci_hci_reset_pipes(ndev->hci_dev);
738 if (ndev->hci_dev->init_data.gates[0].gate != NCI_HCI_ADMIN_GATE)
741 r = nci_hci_connect_gate(ndev,
742 ndev->hci_dev->init_data.gates[0].dest_host,
743 ndev->hci_dev->init_data.gates[0].gate,
744 ndev->hci_dev->init_data.gates[0].pipe);
748 r = nci_hci_get_param(ndev, NCI_HCI_ADMIN_GATE,
749 NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY, &skb);
754 skb->len == strlen(ndev->hci_dev->init_data.session_id) &&
755 !memcmp(ndev->hci_dev->init_data.session_id, skb->data, skb->len) &&
756 ndev->ops->hci_load_session) {
757 /* Restore gate<->pipe table from some proprietary location. */
758 r = ndev->ops->hci_load_session(ndev);
760 r = nci_hci_clear_all_pipes(ndev);
764 r = nci_hci_dev_connect_gates(ndev,
765 ndev->hci_dev->init_data.gate_count,
766 ndev->hci_dev->init_data.gates);
770 r = nci_hci_set_param(ndev, NCI_HCI_ADMIN_GATE,
771 NCI_HCI_ADMIN_PARAM_SESSION_IDENTITY,
772 ndev->hci_dev->init_data.session_id,
773 strlen(ndev->hci_dev->init_data.session_id));
781 EXPORT_SYMBOL(nci_hci_dev_session_init);
783 struct nci_hci_dev *nci_hci_allocate(struct nci_dev *ndev)
785 struct nci_hci_dev *hdev;
787 hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
791 skb_queue_head_init(&hdev->rx_hcp_frags);
792 INIT_WORK(&hdev->msg_rx_work, nci_hci_msg_rx_work);
793 skb_queue_head_init(&hdev->msg_rx_queue);
799 void nci_hci_deallocate(struct nci_dev *ndev)
801 kfree(ndev->hci_dev);