2 * The NFC Controller Interface is the communication protocol between an
3 * NFC Controller (NFCC) and a Device Host (DH).
5 * Copyright (C) 2011 Texas Instruments, Inc.
7 * Written by Ilan Elias <ilane@ti.com>
10 * This file is based on hci_event.c, which was written
11 * by Maxim Krasnyansky.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2
15 * as published by the Free Software Foundation
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
30 #include <linux/types.h>
31 #include <linux/interrupt.h>
32 #include <linux/bitops.h>
33 #include <linux/skbuff.h>
36 #include <net/nfc/nci.h>
37 #include <net/nfc/nci_core.h>
38 #include <linux/nfc.h>
40 /* Handle NCI Notification packets */
42 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
45 struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
48 pr_debug("num_entries %d\n", ntf->num_entries);
50 if (ntf->num_entries > NCI_MAX_NUM_CONN)
51 ntf->num_entries = NCI_MAX_NUM_CONN;
53 /* update the credits */
54 for (i = 0; i < ntf->num_entries; i++) {
55 ntf->conn_entries[i].conn_id =
56 nci_conn_id(&ntf->conn_entries[i].conn_id);
58 pr_debug("entry[%d]: conn_id %d, credits %d\n",
59 i, ntf->conn_entries[i].conn_id,
60 ntf->conn_entries[i].credits);
62 if (ntf->conn_entries[i].conn_id == NCI_STATIC_RF_CONN_ID) {
63 /* found static rf connection */
64 atomic_add(ntf->conn_entries[i].credits,
69 /* trigger the next tx */
70 if (!skb_queue_empty(&ndev->tx_q))
71 queue_work(ndev->tx_wq, &ndev->tx_work);
74 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
77 __u8 status = skb->data[0];
79 pr_debug("status 0x%x\n", status);
81 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
82 /* Activation failed, so complete the request
83 (the state remains the same) */
84 nci_req_complete(ndev, status);
88 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
91 struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
93 ntf->conn_id = nci_conn_id(&ntf->conn_id);
95 pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
97 /* complete the data exchange transaction, if exists */
98 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
99 nci_data_exchange_complete(ndev, NULL, -EIO);
102 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
103 struct rf_tech_specific_params_nfca_poll *nfca_poll,
106 nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
109 nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
111 pr_debug("sens_res 0x%x, nfcid1_len %d\n",
112 nfca_poll->sens_res, nfca_poll->nfcid1_len);
114 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
115 data += nfca_poll->nfcid1_len;
117 nfca_poll->sel_res_len = *data++;
119 if (nfca_poll->sel_res_len != 0)
120 nfca_poll->sel_res = *data++;
122 pr_debug("sel_res_len %d, sel_res 0x%x\n",
123 nfca_poll->sel_res_len,
129 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
130 struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
133 nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
135 pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
137 memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
138 data += nfcb_poll->sensb_res_len;
143 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
144 struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
147 nfcf_poll->bit_rate = *data++;
148 nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
150 pr_debug("bit_rate %d, sensf_res_len %d\n",
151 nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
153 memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
154 data += nfcf_poll->sensf_res_len;
159 static int nci_add_new_protocol(struct nci_dev *ndev,
160 struct nfc_target *target,
162 __u8 rf_tech_and_mode,
165 struct rf_tech_specific_params_nfca_poll *nfca_poll;
166 struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
167 struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
170 if (rf_protocol == NCI_RF_PROTOCOL_T2T)
171 protocol = NFC_PROTO_MIFARE_MASK;
172 else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
173 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
174 protocol = NFC_PROTO_ISO14443_MASK;
176 protocol = NFC_PROTO_ISO14443_B_MASK;
177 else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
178 protocol = NFC_PROTO_FELICA_MASK;
182 if (!(protocol & ndev->poll_prots)) {
183 pr_err("the target found does not have the desired protocol\n");
187 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
188 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
190 target->sens_res = nfca_poll->sens_res;
191 target->sel_res = nfca_poll->sel_res;
192 target->nfcid1_len = nfca_poll->nfcid1_len;
193 if (target->nfcid1_len > 0) {
194 memcpy(target->nfcid1, nfca_poll->nfcid1,
197 } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
198 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
200 target->sensb_res_len = nfcb_poll->sensb_res_len;
201 if (target->sensb_res_len > 0) {
202 memcpy(target->sensb_res, nfcb_poll->sensb_res,
203 target->sensb_res_len);
205 } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
206 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
208 target->sensf_res_len = nfcf_poll->sensf_res_len;
209 if (target->sensf_res_len > 0) {
210 memcpy(target->sensf_res, nfcf_poll->sensf_res,
211 target->sensf_res_len);
214 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
218 target->supported_protocols |= protocol;
220 pr_debug("protocol 0x%x\n", protocol);
225 static void nci_add_new_target(struct nci_dev *ndev,
226 struct nci_rf_discover_ntf *ntf)
228 struct nfc_target *target;
231 for (i = 0; i < ndev->n_targets; i++) {
232 target = &ndev->targets[i];
233 if (target->logical_idx == ntf->rf_discovery_id) {
234 /* This target already exists, add the new protocol */
235 nci_add_new_protocol(ndev, target, ntf->rf_protocol,
236 ntf->rf_tech_and_mode,
237 &ntf->rf_tech_specific_params);
242 /* This is a new target, check if we've enough room */
243 if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
244 pr_debug("not enough room, ignoring new target...\n");
248 target = &ndev->targets[ndev->n_targets];
250 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
251 ntf->rf_tech_and_mode,
252 &ntf->rf_tech_specific_params);
254 target->logical_idx = ntf->rf_discovery_id;
257 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
262 void nci_clear_target_list(struct nci_dev *ndev)
264 memset(ndev->targets, 0,
265 (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
270 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
273 struct nci_rf_discover_ntf ntf;
274 __u8 *data = skb->data;
275 bool add_target = true;
277 ntf.rf_discovery_id = *data++;
278 ntf.rf_protocol = *data++;
279 ntf.rf_tech_and_mode = *data++;
280 ntf.rf_tech_specific_params_len = *data++;
282 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
283 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
284 pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
285 pr_debug("rf_tech_specific_params_len %d\n",
286 ntf.rf_tech_specific_params_len);
288 if (ntf.rf_tech_specific_params_len > 0) {
289 switch (ntf.rf_tech_and_mode) {
290 case NCI_NFC_A_PASSIVE_POLL_MODE:
291 data = nci_extract_rf_params_nfca_passive_poll(ndev,
292 &(ntf.rf_tech_specific_params.nfca_poll), data);
295 case NCI_NFC_B_PASSIVE_POLL_MODE:
296 data = nci_extract_rf_params_nfcb_passive_poll(ndev,
297 &(ntf.rf_tech_specific_params.nfcb_poll), data);
300 case NCI_NFC_F_PASSIVE_POLL_MODE:
301 data = nci_extract_rf_params_nfcf_passive_poll(ndev,
302 &(ntf.rf_tech_specific_params.nfcf_poll), data);
306 pr_err("unsupported rf_tech_and_mode 0x%x\n",
307 ntf.rf_tech_and_mode);
308 data += ntf.rf_tech_specific_params_len;
313 ntf.ntf_type = *data++;
314 pr_debug("ntf_type %d\n", ntf.ntf_type);
316 if (add_target == true)
317 nci_add_new_target(ndev, &ntf);
319 if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
320 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
322 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
323 nfc_targets_found(ndev->nfc_dev, ndev->targets,
328 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
329 struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
331 struct activation_params_nfca_poll_iso_dep *nfca_poll;
332 struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
334 switch (ntf->activation_rf_tech_and_mode) {
335 case NCI_NFC_A_PASSIVE_POLL_MODE:
336 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
337 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
338 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
339 if (nfca_poll->rats_res_len > 0) {
340 memcpy(nfca_poll->rats_res,
341 data, nfca_poll->rats_res_len);
345 case NCI_NFC_B_PASSIVE_POLL_MODE:
346 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
347 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
348 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
349 if (nfcb_poll->attrib_res_len > 0) {
350 memcpy(nfcb_poll->attrib_res,
351 data, nfcb_poll->attrib_res_len);
356 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
357 ntf->activation_rf_tech_and_mode);
358 return NCI_STATUS_RF_PROTOCOL_ERROR;
361 return NCI_STATUS_OK;
364 static void nci_target_auto_activated(struct nci_dev *ndev,
365 struct nci_rf_intf_activated_ntf *ntf)
367 struct nfc_target *target;
370 target = &ndev->targets[ndev->n_targets];
372 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
373 ntf->activation_rf_tech_and_mode,
374 &ntf->rf_tech_specific_params);
378 target->logical_idx = ntf->rf_discovery_id;
381 pr_debug("logical idx %d, n_targets %d\n",
382 target->logical_idx, ndev->n_targets);
384 nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
387 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
390 struct nci_rf_intf_activated_ntf ntf;
391 __u8 *data = skb->data;
392 int err = NCI_STATUS_OK;
394 ntf.rf_discovery_id = *data++;
395 ntf.rf_interface = *data++;
396 ntf.rf_protocol = *data++;
397 ntf.activation_rf_tech_and_mode = *data++;
398 ntf.max_data_pkt_payload_size = *data++;
399 ntf.initial_num_credits = *data++;
400 ntf.rf_tech_specific_params_len = *data++;
402 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
403 pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
404 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
405 pr_debug("activation_rf_tech_and_mode 0x%x\n",
406 ntf.activation_rf_tech_and_mode);
407 pr_debug("max_data_pkt_payload_size 0x%x\n",
408 ntf.max_data_pkt_payload_size);
409 pr_debug("initial_num_credits 0x%x\n",
410 ntf.initial_num_credits);
411 pr_debug("rf_tech_specific_params_len %d\n",
412 ntf.rf_tech_specific_params_len);
414 if (ntf.rf_tech_specific_params_len > 0) {
415 switch (ntf.activation_rf_tech_and_mode) {
416 case NCI_NFC_A_PASSIVE_POLL_MODE:
417 data = nci_extract_rf_params_nfca_passive_poll(ndev,
418 &(ntf.rf_tech_specific_params.nfca_poll), data);
421 case NCI_NFC_B_PASSIVE_POLL_MODE:
422 data = nci_extract_rf_params_nfcb_passive_poll(ndev,
423 &(ntf.rf_tech_specific_params.nfcb_poll), data);
426 case NCI_NFC_F_PASSIVE_POLL_MODE:
427 data = nci_extract_rf_params_nfcf_passive_poll(ndev,
428 &(ntf.rf_tech_specific_params.nfcf_poll), data);
432 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
433 ntf.activation_rf_tech_and_mode);
434 err = NCI_STATUS_RF_PROTOCOL_ERROR;
439 ntf.data_exch_rf_tech_and_mode = *data++;
440 ntf.data_exch_tx_bit_rate = *data++;
441 ntf.data_exch_rx_bit_rate = *data++;
442 ntf.activation_params_len = *data++;
444 pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
445 ntf.data_exch_rf_tech_and_mode);
446 pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
447 pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
448 pr_debug("activation_params_len %d\n", ntf.activation_params_len);
450 if (ntf.activation_params_len > 0) {
451 switch (ntf.rf_interface) {
452 case NCI_RF_INTERFACE_ISO_DEP:
453 err = nci_extract_activation_params_iso_dep(ndev,
457 case NCI_RF_INTERFACE_FRAME:
458 /* no activation params */
462 pr_err("unsupported rf_interface 0x%x\n",
464 err = NCI_STATUS_RF_PROTOCOL_ERROR;
470 if (err == NCI_STATUS_OK) {
471 ndev->max_data_pkt_payload_size = ntf.max_data_pkt_payload_size;
472 ndev->initial_num_credits = ntf.initial_num_credits;
474 /* set the available credits to initial value */
475 atomic_set(&ndev->credits_cnt, ndev->initial_num_credits);
478 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
479 /* A single target was found and activated automatically */
480 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
481 if (err == NCI_STATUS_OK)
482 nci_target_auto_activated(ndev, &ntf);
483 } else { /* ndev->state == NCI_W4_HOST_SELECT */
484 /* A selected target was activated, so complete the request */
485 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
486 nci_req_complete(ndev, err);
490 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
493 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
495 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
497 /* drop tx data queue */
498 skb_queue_purge(&ndev->tx_q);
500 /* drop partial rx data packet */
501 if (ndev->rx_data_reassembly) {
502 kfree_skb(ndev->rx_data_reassembly);
503 ndev->rx_data_reassembly = NULL;
506 /* complete the data exchange transaction, if exists */
507 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
508 nci_data_exchange_complete(ndev, NULL, -EIO);
510 nci_clear_target_list(ndev);
511 atomic_set(&ndev->state, NCI_IDLE);
512 nci_req_complete(ndev, NCI_STATUS_OK);
515 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
517 __u16 ntf_opcode = nci_opcode(skb->data);
519 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
521 nci_opcode_gid(ntf_opcode),
522 nci_opcode_oid(ntf_opcode),
523 nci_plen(skb->data));
525 /* strip the nci control header */
526 skb_pull(skb, NCI_CTRL_HDR_SIZE);
528 switch (ntf_opcode) {
529 case NCI_OP_CORE_CONN_CREDITS_NTF:
530 nci_core_conn_credits_ntf_packet(ndev, skb);
533 case NCI_OP_CORE_GENERIC_ERROR_NTF:
534 nci_core_generic_error_ntf_packet(ndev, skb);
537 case NCI_OP_CORE_INTF_ERROR_NTF:
538 nci_core_conn_intf_error_ntf_packet(ndev, skb);
541 case NCI_OP_RF_DISCOVER_NTF:
542 nci_rf_discover_ntf_packet(ndev, skb);
545 case NCI_OP_RF_INTF_ACTIVATED_NTF:
546 nci_rf_intf_activated_ntf_packet(ndev, skb);
549 case NCI_OP_RF_DEACTIVATE_NTF:
550 nci_rf_deactivate_ntf_packet(ndev, skb);
554 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);