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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * Copyright (C) 2012 Intel Corporation. All rights reserved. | |
4 | */ | |
5 | ||
6 | #define pr_fmt(fmt) "hci: %s: " fmt, __func__ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/nfc.h> | |
12 | ||
13 | #include <net/nfc/nfc.h> | |
14 | #include <net/nfc/hci.h> | |
15 | #include <net/nfc/llc.h> | |
16 | ||
17 | #include "hci.h" | |
18 | ||
19 | /* Largest headroom needed for outgoing HCI commands */ | |
20 | #define HCI_CMDS_HEADROOM 1 | |
21 | ||
22 | int nfc_hci_result_to_errno(u8 result) | |
23 | { | |
24 | switch (result) { | |
25 | case NFC_HCI_ANY_OK: | |
26 | return 0; | |
27 | case NFC_HCI_ANY_E_REG_PAR_UNKNOWN: | |
28 | return -EOPNOTSUPP; | |
29 | case NFC_HCI_ANY_E_TIMEOUT: | |
30 | return -ETIME; | |
31 | default: | |
32 | return -1; | |
33 | } | |
34 | } | |
35 | EXPORT_SYMBOL(nfc_hci_result_to_errno); | |
36 | ||
37 | void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev) | |
38 | { | |
39 | int i = 0; | |
40 | ||
41 | for (i = 0; i < NFC_HCI_MAX_PIPES; i++) { | |
42 | hdev->pipes[i].gate = NFC_HCI_INVALID_GATE; | |
43 | hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST; | |
44 | } | |
45 | memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); | |
46 | } | |
47 | EXPORT_SYMBOL(nfc_hci_reset_pipes); | |
48 | ||
49 | void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host) | |
50 | { | |
51 | int i = 0; | |
52 | ||
53 | for (i = 0; i < NFC_HCI_MAX_PIPES; i++) { | |
54 | if (hdev->pipes[i].dest_host != host) | |
55 | continue; | |
56 | ||
57 | hdev->pipes[i].gate = NFC_HCI_INVALID_GATE; | |
58 | hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST; | |
59 | } | |
60 | } | |
61 | EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host); | |
62 | ||
63 | static void nfc_hci_msg_tx_work(struct work_struct *work) | |
64 | { | |
65 | struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, | |
66 | msg_tx_work); | |
67 | struct hci_msg *msg; | |
68 | struct sk_buff *skb; | |
69 | int r = 0; | |
70 | ||
71 | mutex_lock(&hdev->msg_tx_mutex); | |
72 | if (hdev->shutting_down) | |
73 | goto exit; | |
74 | ||
75 | if (hdev->cmd_pending_msg) { | |
76 | if (timer_pending(&hdev->cmd_timer) == 0) { | |
77 | if (hdev->cmd_pending_msg->cb) | |
78 | hdev->cmd_pending_msg->cb(hdev-> | |
79 | cmd_pending_msg-> | |
80 | cb_context, | |
81 | NULL, | |
82 | -ETIME); | |
83 | kfree(hdev->cmd_pending_msg); | |
84 | hdev->cmd_pending_msg = NULL; | |
85 | } else { | |
86 | goto exit; | |
87 | } | |
88 | } | |
89 | ||
90 | next_msg: | |
91 | if (list_empty(&hdev->msg_tx_queue)) | |
92 | goto exit; | |
93 | ||
94 | msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l); | |
95 | list_del(&msg->msg_l); | |
96 | ||
97 | pr_debug("msg_tx_queue has a cmd to send\n"); | |
98 | while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) { | |
99 | r = nfc_llc_xmit_from_hci(hdev->llc, skb); | |
100 | if (r < 0) { | |
101 | kfree_skb(skb); | |
102 | skb_queue_purge(&msg->msg_frags); | |
103 | if (msg->cb) | |
104 | msg->cb(msg->cb_context, NULL, r); | |
105 | kfree(msg); | |
106 | break; | |
107 | } | |
108 | } | |
109 | ||
110 | if (r) | |
111 | goto next_msg; | |
112 | ||
113 | if (msg->wait_response == false) { | |
114 | kfree(msg); | |
115 | goto next_msg; | |
116 | } | |
117 | ||
118 | hdev->cmd_pending_msg = msg; | |
119 | mod_timer(&hdev->cmd_timer, jiffies + | |
120 | msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay)); | |
121 | ||
122 | exit: | |
123 | mutex_unlock(&hdev->msg_tx_mutex); | |
124 | } | |
125 | ||
126 | static void nfc_hci_msg_rx_work(struct work_struct *work) | |
127 | { | |
128 | struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, | |
129 | msg_rx_work); | |
130 | struct sk_buff *skb; | |
131 | const struct hcp_message *message; | |
132 | u8 pipe; | |
133 | u8 type; | |
134 | u8 instruction; | |
135 | ||
136 | while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { | |
137 | pipe = skb->data[0]; | |
138 | skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN); | |
139 | message = (struct hcp_message *)skb->data; | |
140 | type = HCP_MSG_GET_TYPE(message->header); | |
141 | instruction = HCP_MSG_GET_CMD(message->header); | |
142 | skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN); | |
143 | ||
144 | nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); | |
145 | } | |
146 | } | |
147 | ||
148 | static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err, | |
149 | struct sk_buff *skb) | |
150 | { | |
151 | del_timer_sync(&hdev->cmd_timer); | |
152 | ||
153 | if (hdev->cmd_pending_msg->cb) | |
154 | hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context, | |
155 | skb, err); | |
156 | else | |
157 | kfree_skb(skb); | |
158 | ||
159 | kfree(hdev->cmd_pending_msg); | |
160 | hdev->cmd_pending_msg = NULL; | |
161 | ||
162 | schedule_work(&hdev->msg_tx_work); | |
163 | } | |
164 | ||
165 | void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result, | |
166 | struct sk_buff *skb) | |
167 | { | |
168 | mutex_lock(&hdev->msg_tx_mutex); | |
169 | ||
170 | if (hdev->cmd_pending_msg == NULL) { | |
171 | kfree_skb(skb); | |
172 | goto exit; | |
173 | } | |
174 | ||
175 | __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb); | |
176 | ||
177 | exit: | |
178 | mutex_unlock(&hdev->msg_tx_mutex); | |
179 | } | |
180 | ||
181 | void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, | |
182 | struct sk_buff *skb) | |
183 | { | |
184 | u8 status = NFC_HCI_ANY_OK; | |
185 | const struct hci_create_pipe_resp *create_info; | |
186 | const struct hci_delete_pipe_noti *delete_info; | |
187 | const struct hci_all_pipe_cleared_noti *cleared_info; | |
188 | u8 gate; | |
189 | ||
190 | pr_debug("from pipe %x cmd %x\n", pipe, cmd); | |
191 | ||
192 | if (pipe >= NFC_HCI_MAX_PIPES) { | |
193 | status = NFC_HCI_ANY_E_NOK; | |
194 | goto exit; | |
195 | } | |
196 | ||
197 | gate = hdev->pipes[pipe].gate; | |
198 | ||
199 | switch (cmd) { | |
200 | case NFC_HCI_ADM_NOTIFY_PIPE_CREATED: | |
201 | if (skb->len != 5) { | |
202 | status = NFC_HCI_ANY_E_NOK; | |
203 | goto exit; | |
204 | } | |
205 | create_info = (struct hci_create_pipe_resp *)skb->data; | |
206 | ||
207 | if (create_info->pipe >= NFC_HCI_MAX_PIPES) { | |
208 | status = NFC_HCI_ANY_E_NOK; | |
209 | goto exit; | |
210 | } | |
211 | ||
212 | /* Save the new created pipe and bind with local gate, | |
213 | * the description for skb->data[3] is destination gate id | |
214 | * but since we received this cmd from host controller, we | |
215 | * are the destination and it is our local gate | |
216 | */ | |
217 | hdev->gate2pipe[create_info->dest_gate] = create_info->pipe; | |
218 | hdev->pipes[create_info->pipe].gate = create_info->dest_gate; | |
219 | hdev->pipes[create_info->pipe].dest_host = | |
220 | create_info->src_host; | |
221 | break; | |
222 | case NFC_HCI_ANY_OPEN_PIPE: | |
223 | if (gate == NFC_HCI_INVALID_GATE) { | |
224 | status = NFC_HCI_ANY_E_NOK; | |
225 | goto exit; | |
226 | } | |
227 | break; | |
228 | case NFC_HCI_ADM_NOTIFY_PIPE_DELETED: | |
229 | if (skb->len != 1) { | |
230 | status = NFC_HCI_ANY_E_NOK; | |
231 | goto exit; | |
232 | } | |
233 | delete_info = (struct hci_delete_pipe_noti *)skb->data; | |
234 | ||
235 | if (delete_info->pipe >= NFC_HCI_MAX_PIPES) { | |
236 | status = NFC_HCI_ANY_E_NOK; | |
237 | goto exit; | |
238 | } | |
239 | ||
240 | hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE; | |
241 | hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST; | |
242 | break; | |
243 | case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED: | |
244 | if (skb->len != 1) { | |
245 | status = NFC_HCI_ANY_E_NOK; | |
246 | goto exit; | |
247 | } | |
248 | cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data; | |
249 | ||
250 | nfc_hci_reset_pipes_per_host(hdev, cleared_info->host); | |
251 | break; | |
252 | default: | |
253 | pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate); | |
254 | break; | |
255 | } | |
256 | ||
257 | if (hdev->ops->cmd_received) | |
258 | hdev->ops->cmd_received(hdev, pipe, cmd, skb); | |
259 | ||
260 | exit: | |
261 | nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE, | |
262 | status, NULL, 0, NULL, NULL, 0); | |
263 | ||
264 | kfree_skb(skb); | |
265 | } | |
266 | ||
267 | u32 nfc_hci_sak_to_protocol(u8 sak) | |
268 | { | |
269 | switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { | |
270 | case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: | |
271 | return NFC_PROTO_MIFARE_MASK; | |
272 | case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: | |
273 | return NFC_PROTO_ISO14443_MASK; | |
274 | case NFC_HCI_TYPE_A_SEL_PROT_DEP: | |
275 | return NFC_PROTO_NFC_DEP_MASK; | |
276 | case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: | |
277 | return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; | |
278 | default: | |
279 | return 0xffffffff; | |
280 | } | |
281 | } | |
282 | EXPORT_SYMBOL(nfc_hci_sak_to_protocol); | |
283 | ||
284 | int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) | |
285 | { | |
286 | struct nfc_target *targets; | |
287 | struct sk_buff *atqa_skb = NULL; | |
288 | struct sk_buff *sak_skb = NULL; | |
289 | struct sk_buff *uid_skb = NULL; | |
290 | int r; | |
291 | ||
292 | pr_debug("from gate %d\n", gate); | |
293 | ||
294 | targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); | |
295 | if (targets == NULL) | |
296 | return -ENOMEM; | |
297 | ||
298 | switch (gate) { | |
299 | case NFC_HCI_RF_READER_A_GATE: | |
300 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
301 | NFC_HCI_RF_READER_A_ATQA, &atqa_skb); | |
302 | if (r < 0) | |
303 | goto exit; | |
304 | ||
305 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
306 | NFC_HCI_RF_READER_A_SAK, &sak_skb); | |
307 | if (r < 0) | |
308 | goto exit; | |
309 | ||
310 | if (atqa_skb->len != 2 || sak_skb->len != 1) { | |
311 | r = -EPROTO; | |
312 | goto exit; | |
313 | } | |
314 | ||
315 | targets->supported_protocols = | |
316 | nfc_hci_sak_to_protocol(sak_skb->data[0]); | |
317 | if (targets->supported_protocols == 0xffffffff) { | |
318 | r = -EPROTO; | |
319 | goto exit; | |
320 | } | |
321 | ||
322 | targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data); | |
323 | targets->sel_res = sak_skb->data[0]; | |
324 | ||
325 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
326 | NFC_HCI_RF_READER_A_UID, &uid_skb); | |
327 | if (r < 0) | |
328 | goto exit; | |
329 | ||
330 | if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) { | |
331 | r = -EPROTO; | |
332 | goto exit; | |
333 | } | |
334 | ||
335 | memcpy(targets->nfcid1, uid_skb->data, uid_skb->len); | |
336 | targets->nfcid1_len = uid_skb->len; | |
337 | ||
338 | if (hdev->ops->complete_target_discovered) { | |
339 | r = hdev->ops->complete_target_discovered(hdev, gate, | |
340 | targets); | |
341 | if (r < 0) | |
342 | goto exit; | |
343 | } | |
344 | break; | |
345 | case NFC_HCI_RF_READER_B_GATE: | |
346 | targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK; | |
347 | break; | |
348 | default: | |
349 | if (hdev->ops->target_from_gate) | |
350 | r = hdev->ops->target_from_gate(hdev, gate, targets); | |
351 | else | |
352 | r = -EPROTO; | |
353 | if (r < 0) | |
354 | goto exit; | |
355 | ||
356 | if (hdev->ops->complete_target_discovered) { | |
357 | r = hdev->ops->complete_target_discovered(hdev, gate, | |
358 | targets); | |
359 | if (r < 0) | |
360 | goto exit; | |
361 | } | |
362 | break; | |
363 | } | |
364 | ||
365 | /* if driver set the new gate, we will skip the old one */ | |
366 | if (targets->hci_reader_gate == 0x00) | |
367 | targets->hci_reader_gate = gate; | |
368 | ||
369 | r = nfc_targets_found(hdev->ndev, targets, 1); | |
370 | ||
371 | exit: | |
372 | kfree(targets); | |
373 | kfree_skb(atqa_skb); | |
374 | kfree_skb(sak_skb); | |
375 | kfree_skb(uid_skb); | |
376 | ||
377 | return r; | |
378 | } | |
379 | EXPORT_SYMBOL(nfc_hci_target_discovered); | |
380 | ||
381 | void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, | |
382 | struct sk_buff *skb) | |
383 | { | |
384 | int r = 0; | |
385 | u8 gate; | |
386 | ||
387 | if (pipe >= NFC_HCI_MAX_PIPES) { | |
388 | pr_err("Discarded event %x to invalid pipe %x\n", event, pipe); | |
389 | goto exit; | |
390 | } | |
391 | ||
392 | gate = hdev->pipes[pipe].gate; | |
393 | if (gate == NFC_HCI_INVALID_GATE) { | |
394 | pr_err("Discarded event %x to unopened pipe %x\n", event, pipe); | |
395 | goto exit; | |
396 | } | |
397 | ||
398 | if (hdev->ops->event_received) { | |
399 | r = hdev->ops->event_received(hdev, pipe, event, skb); | |
400 | if (r <= 0) | |
401 | goto exit_noskb; | |
402 | } | |
403 | ||
404 | switch (event) { | |
405 | case NFC_HCI_EVT_TARGET_DISCOVERED: | |
406 | if (skb->len < 1) { /* no status data? */ | |
407 | r = -EPROTO; | |
408 | goto exit; | |
409 | } | |
410 | ||
411 | if (skb->data[0] == 3) { | |
412 | /* TODO: Multiple targets in field, none activated | |
413 | * poll is supposedly stopped, but there is no | |
414 | * single target to activate, so nothing to report | |
415 | * up. | |
416 | * if we need to restart poll, we must save the | |
417 | * protocols from the initial poll and reuse here. | |
418 | */ | |
419 | } | |
420 | ||
421 | if (skb->data[0] != 0) { | |
422 | r = -EPROTO; | |
423 | goto exit; | |
424 | } | |
425 | ||
426 | r = nfc_hci_target_discovered(hdev, gate); | |
427 | break; | |
428 | default: | |
429 | pr_info("Discarded unknown event %x to gate %x\n", event, gate); | |
430 | r = -EINVAL; | |
431 | break; | |
432 | } | |
433 | ||
434 | exit: | |
435 | kfree_skb(skb); | |
436 | ||
437 | exit_noskb: | |
438 | if (r) | |
439 | nfc_hci_driver_failure(hdev, r); | |
440 | } | |
441 | ||
442 | static void nfc_hci_cmd_timeout(struct timer_list *t) | |
443 | { | |
444 | struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer); | |
445 | ||
446 | schedule_work(&hdev->msg_tx_work); | |
447 | } | |
448 | ||
449 | static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, | |
450 | const struct nfc_hci_gate *gates) | |
451 | { | |
452 | int r; | |
453 | while (gate_count--) { | |
454 | r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, | |
455 | gates->gate, gates->pipe); | |
456 | if (r < 0) | |
457 | return r; | |
458 | gates++; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static int hci_dev_session_init(struct nfc_hci_dev *hdev) | |
465 | { | |
466 | struct sk_buff *skb = NULL; | |
467 | int r; | |
468 | ||
469 | if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE) | |
470 | return -EPROTO; | |
471 | ||
472 | r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, | |
473 | hdev->init_data.gates[0].gate, | |
474 | hdev->init_data.gates[0].pipe); | |
475 | if (r < 0) | |
476 | goto exit; | |
477 | ||
478 | r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, | |
479 | NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); | |
480 | if (r < 0) | |
481 | goto disconnect_all; | |
482 | ||
483 | if (skb->len && skb->len == strlen(hdev->init_data.session_id) && | |
484 | (memcmp(hdev->init_data.session_id, skb->data, | |
485 | skb->len) == 0) && hdev->ops->load_session) { | |
486 | /* Restore gate<->pipe table from some proprietary location. */ | |
487 | ||
488 | r = hdev->ops->load_session(hdev); | |
489 | ||
490 | if (r < 0) | |
491 | goto disconnect_all; | |
492 | } else { | |
493 | ||
494 | r = nfc_hci_disconnect_all_gates(hdev); | |
495 | if (r < 0) | |
496 | goto exit; | |
497 | ||
498 | r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, | |
499 | hdev->init_data.gates); | |
500 | if (r < 0) | |
501 | goto disconnect_all; | |
502 | ||
503 | r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, | |
504 | NFC_HCI_ADMIN_SESSION_IDENTITY, | |
505 | hdev->init_data.session_id, | |
506 | strlen(hdev->init_data.session_id)); | |
507 | } | |
508 | if (r == 0) | |
509 | goto exit; | |
510 | ||
511 | disconnect_all: | |
512 | nfc_hci_disconnect_all_gates(hdev); | |
513 | ||
514 | exit: | |
515 | kfree_skb(skb); | |
516 | ||
517 | return r; | |
518 | } | |
519 | ||
520 | static int hci_dev_version(struct nfc_hci_dev *hdev) | |
521 | { | |
522 | int r; | |
523 | struct sk_buff *skb; | |
524 | ||
525 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
526 | NFC_HCI_ID_MGMT_VERSION_SW, &skb); | |
527 | if (r == -EOPNOTSUPP) { | |
528 | pr_info("Software/Hardware info not available\n"); | |
529 | return 0; | |
530 | } | |
531 | if (r < 0) | |
532 | return r; | |
533 | ||
534 | if (skb->len != 3) { | |
535 | kfree_skb(skb); | |
536 | return -EINVAL; | |
537 | } | |
538 | ||
539 | hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; | |
540 | hdev->sw_patch = skb->data[0] & 0x0f; | |
541 | hdev->sw_flashlib_major = skb->data[1]; | |
542 | hdev->sw_flashlib_minor = skb->data[2]; | |
543 | ||
544 | kfree_skb(skb); | |
545 | ||
546 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
547 | NFC_HCI_ID_MGMT_VERSION_HW, &skb); | |
548 | if (r < 0) | |
549 | return r; | |
550 | ||
551 | if (skb->len != 3) { | |
552 | kfree_skb(skb); | |
553 | return -EINVAL; | |
554 | } | |
555 | ||
556 | hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; | |
557 | hdev->hw_version = skb->data[0] & 0x1f; | |
558 | hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; | |
559 | hdev->hw_software = skb->data[1] & 0x3f; | |
560 | hdev->hw_bsid = skb->data[2]; | |
561 | ||
562 | kfree_skb(skb); | |
563 | ||
564 | pr_info("SOFTWARE INFO:\n"); | |
565 | pr_info("RomLib : %d\n", hdev->sw_romlib); | |
566 | pr_info("Patch : %d\n", hdev->sw_patch); | |
567 | pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); | |
568 | pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); | |
569 | pr_info("HARDWARE INFO:\n"); | |
570 | pr_info("Derivative : %d\n", hdev->hw_derivative); | |
571 | pr_info("HW Version : %d\n", hdev->hw_version); | |
572 | pr_info("#MPW : %d\n", hdev->hw_mpw); | |
573 | pr_info("Software : %d\n", hdev->hw_software); | |
574 | pr_info("BSID Version : %d\n", hdev->hw_bsid); | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | static int hci_dev_up(struct nfc_dev *nfc_dev) | |
580 | { | |
581 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
582 | int r = 0; | |
583 | ||
584 | if (hdev->ops->open) { | |
585 | r = hdev->ops->open(hdev); | |
586 | if (r < 0) | |
587 | return r; | |
588 | } | |
589 | ||
590 | r = nfc_llc_start(hdev->llc); | |
591 | if (r < 0) | |
592 | goto exit_close; | |
593 | ||
594 | r = hci_dev_session_init(hdev); | |
595 | if (r < 0) | |
596 | goto exit_llc; | |
597 | ||
598 | r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
599 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
600 | if (r < 0) | |
601 | goto exit_llc; | |
602 | ||
603 | if (hdev->ops->hci_ready) { | |
604 | r = hdev->ops->hci_ready(hdev); | |
605 | if (r < 0) | |
606 | goto exit_llc; | |
607 | } | |
608 | ||
609 | r = hci_dev_version(hdev); | |
610 | if (r < 0) | |
611 | goto exit_llc; | |
612 | ||
613 | return 0; | |
614 | ||
615 | exit_llc: | |
616 | nfc_llc_stop(hdev->llc); | |
617 | ||
618 | exit_close: | |
619 | if (hdev->ops->close) | |
620 | hdev->ops->close(hdev); | |
621 | ||
622 | return r; | |
623 | } | |
624 | ||
625 | static int hci_dev_down(struct nfc_dev *nfc_dev) | |
626 | { | |
627 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
628 | ||
629 | nfc_llc_stop(hdev->llc); | |
630 | ||
631 | if (hdev->ops->close) | |
632 | hdev->ops->close(hdev); | |
633 | ||
634 | nfc_hci_reset_pipes(hdev); | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | static int hci_start_poll(struct nfc_dev *nfc_dev, | |
640 | u32 im_protocols, u32 tm_protocols) | |
641 | { | |
642 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
643 | ||
644 | if (hdev->ops->start_poll) | |
645 | return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); | |
646 | else | |
647 | return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
648 | NFC_HCI_EVT_READER_REQUESTED, | |
649 | NULL, 0); | |
650 | } | |
651 | ||
652 | static void hci_stop_poll(struct nfc_dev *nfc_dev) | |
653 | { | |
654 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
655 | ||
656 | if (hdev->ops->stop_poll) | |
657 | hdev->ops->stop_poll(hdev); | |
658 | else | |
659 | nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
660 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
661 | } | |
662 | ||
663 | static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, | |
664 | __u8 comm_mode, __u8 *gb, size_t gb_len) | |
665 | { | |
666 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
667 | ||
668 | if (!hdev->ops->dep_link_up) | |
669 | return 0; | |
670 | ||
671 | return hdev->ops->dep_link_up(hdev, target, comm_mode, | |
672 | gb, gb_len); | |
673 | } | |
674 | ||
675 | static int hci_dep_link_down(struct nfc_dev *nfc_dev) | |
676 | { | |
677 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
678 | ||
679 | if (!hdev->ops->dep_link_down) | |
680 | return 0; | |
681 | ||
682 | return hdev->ops->dep_link_down(hdev); | |
683 | } | |
684 | ||
685 | static int hci_activate_target(struct nfc_dev *nfc_dev, | |
686 | struct nfc_target *target, u32 protocol) | |
687 | { | |
688 | return 0; | |
689 | } | |
690 | ||
691 | static void hci_deactivate_target(struct nfc_dev *nfc_dev, | |
692 | struct nfc_target *target, | |
693 | u8 mode) | |
694 | { | |
695 | } | |
696 | ||
697 | #define HCI_CB_TYPE_TRANSCEIVE 1 | |
698 | ||
699 | static void hci_transceive_cb(void *context, struct sk_buff *skb, int err) | |
700 | { | |
701 | struct nfc_hci_dev *hdev = context; | |
702 | ||
703 | switch (hdev->async_cb_type) { | |
704 | case HCI_CB_TYPE_TRANSCEIVE: | |
705 | /* | |
706 | * TODO: Check RF Error indicator to make sure data is valid. | |
707 | * It seems that HCI cmd can complete without error, but data | |
708 | * can be invalid if an RF error occurred? Ignore for now. | |
709 | */ | |
710 | if (err == 0) | |
711 | skb_trim(skb, skb->len - 1); /* RF Err ind */ | |
712 | ||
713 | hdev->async_cb(hdev->async_cb_context, skb, err); | |
714 | break; | |
715 | default: | |
716 | if (err == 0) | |
717 | kfree_skb(skb); | |
718 | break; | |
719 | } | |
720 | } | |
721 | ||
722 | static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, | |
723 | struct sk_buff *skb, data_exchange_cb_t cb, | |
724 | void *cb_context) | |
725 | { | |
726 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
727 | int r; | |
728 | ||
729 | pr_debug("target_idx=%d\n", target->idx); | |
730 | ||
731 | switch (target->hci_reader_gate) { | |
732 | case NFC_HCI_RF_READER_A_GATE: | |
733 | case NFC_HCI_RF_READER_B_GATE: | |
734 | if (hdev->ops->im_transceive) { | |
735 | r = hdev->ops->im_transceive(hdev, target, skb, cb, | |
736 | cb_context); | |
737 | if (r <= 0) /* handled */ | |
738 | break; | |
739 | } | |
740 | ||
741 | *(u8 *)skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ | |
742 | ||
743 | hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE; | |
744 | hdev->async_cb = cb; | |
745 | hdev->async_cb_context = cb_context; | |
746 | ||
747 | r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate, | |
748 | NFC_HCI_WR_XCHG_DATA, skb->data, | |
749 | skb->len, hci_transceive_cb, hdev); | |
750 | break; | |
751 | default: | |
752 | if (hdev->ops->im_transceive) { | |
753 | r = hdev->ops->im_transceive(hdev, target, skb, cb, | |
754 | cb_context); | |
755 | if (r == 1) | |
756 | r = -ENOTSUPP; | |
757 | } else { | |
758 | r = -ENOTSUPP; | |
759 | } | |
760 | break; | |
761 | } | |
762 | ||
763 | kfree_skb(skb); | |
764 | ||
765 | return r; | |
766 | } | |
767 | ||
768 | static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) | |
769 | { | |
770 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
771 | ||
772 | if (!hdev->ops->tm_send) { | |
773 | kfree_skb(skb); | |
774 | return -ENOTSUPP; | |
775 | } | |
776 | ||
777 | return hdev->ops->tm_send(hdev, skb); | |
778 | } | |
779 | ||
780 | static int hci_check_presence(struct nfc_dev *nfc_dev, | |
781 | struct nfc_target *target) | |
782 | { | |
783 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
784 | ||
785 | if (!hdev->ops->check_presence) | |
786 | return 0; | |
787 | ||
788 | return hdev->ops->check_presence(hdev, target); | |
789 | } | |
790 | ||
791 | static int hci_discover_se(struct nfc_dev *nfc_dev) | |
792 | { | |
793 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
794 | ||
795 | if (hdev->ops->discover_se) | |
796 | return hdev->ops->discover_se(hdev); | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
801 | static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx) | |
802 | { | |
803 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
804 | ||
805 | if (hdev->ops->enable_se) | |
806 | return hdev->ops->enable_se(hdev, se_idx); | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
811 | static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx) | |
812 | { | |
813 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
814 | ||
815 | if (hdev->ops->disable_se) | |
816 | return hdev->ops->disable_se(hdev, se_idx); | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx, | |
822 | u8 *apdu, size_t apdu_length, | |
823 | se_io_cb_t cb, void *cb_context) | |
824 | { | |
825 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
826 | ||
827 | if (hdev->ops->se_io) | |
828 | return hdev->ops->se_io(hdev, se_idx, apdu, | |
829 | apdu_length, cb, cb_context); | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
834 | static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) | |
835 | { | |
836 | mutex_lock(&hdev->msg_tx_mutex); | |
837 | ||
838 | if (hdev->cmd_pending_msg == NULL) { | |
839 | nfc_driver_failure(hdev->ndev, err); | |
840 | goto exit; | |
841 | } | |
842 | ||
843 | __nfc_hci_cmd_completion(hdev, err, NULL); | |
844 | ||
845 | exit: | |
846 | mutex_unlock(&hdev->msg_tx_mutex); | |
847 | } | |
848 | ||
849 | static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err) | |
850 | { | |
851 | nfc_hci_failure(hdev, err); | |
852 | } | |
853 | ||
854 | static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb) | |
855 | { | |
856 | struct hcp_packet *packet; | |
857 | u8 type; | |
858 | u8 instruction; | |
859 | struct sk_buff *hcp_skb; | |
860 | u8 pipe; | |
861 | struct sk_buff *frag_skb; | |
862 | int msg_len; | |
863 | ||
864 | packet = (struct hcp_packet *)skb->data; | |
865 | if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { | |
866 | skb_queue_tail(&hdev->rx_hcp_frags, skb); | |
867 | return; | |
868 | } | |
869 | ||
870 | /* it's the last fragment. Does it need re-aggregation? */ | |
871 | if (skb_queue_len(&hdev->rx_hcp_frags)) { | |
872 | pipe = packet->header & NFC_HCI_FRAGMENT; | |
873 | skb_queue_tail(&hdev->rx_hcp_frags, skb); | |
874 | ||
875 | msg_len = 0; | |
876 | skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { | |
877 | msg_len += (frag_skb->len - | |
878 | NFC_HCI_HCP_PACKET_HEADER_LEN); | |
879 | } | |
880 | ||
881 | hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + | |
882 | msg_len, GFP_KERNEL); | |
883 | if (hcp_skb == NULL) { | |
884 | nfc_hci_failure(hdev, -ENOMEM); | |
885 | return; | |
886 | } | |
887 | ||
888 | skb_put_u8(hcp_skb, pipe); | |
889 | ||
890 | skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { | |
891 | msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; | |
892 | skb_put_data(hcp_skb, | |
893 | frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, | |
894 | msg_len); | |
895 | } | |
896 | ||
897 | skb_queue_purge(&hdev->rx_hcp_frags); | |
898 | } else { | |
899 | packet->header &= NFC_HCI_FRAGMENT; | |
900 | hcp_skb = skb; | |
901 | } | |
902 | ||
903 | /* if this is a response, dispatch immediately to | |
904 | * unblock waiting cmd context. Otherwise, enqueue to dispatch | |
905 | * in separate context where handler can also execute command. | |
906 | */ | |
907 | packet = (struct hcp_packet *)hcp_skb->data; | |
908 | type = HCP_MSG_GET_TYPE(packet->message.header); | |
909 | if (type == NFC_HCI_HCP_RESPONSE) { | |
910 | pipe = packet->header; | |
911 | instruction = HCP_MSG_GET_CMD(packet->message.header); | |
912 | skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + | |
913 | NFC_HCI_HCP_MESSAGE_HEADER_LEN); | |
914 | nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); | |
915 | } else { | |
916 | skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); | |
917 | schedule_work(&hdev->msg_rx_work); | |
918 | } | |
919 | } | |
920 | ||
921 | static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name) | |
922 | { | |
923 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
924 | ||
925 | if (!hdev->ops->fw_download) | |
926 | return -ENOTSUPP; | |
927 | ||
928 | return hdev->ops->fw_download(hdev, firmware_name); | |
929 | } | |
930 | ||
931 | static const struct nfc_ops hci_nfc_ops = { | |
932 | .dev_up = hci_dev_up, | |
933 | .dev_down = hci_dev_down, | |
934 | .start_poll = hci_start_poll, | |
935 | .stop_poll = hci_stop_poll, | |
936 | .dep_link_up = hci_dep_link_up, | |
937 | .dep_link_down = hci_dep_link_down, | |
938 | .activate_target = hci_activate_target, | |
939 | .deactivate_target = hci_deactivate_target, | |
940 | .im_transceive = hci_transceive, | |
941 | .tm_send = hci_tm_send, | |
942 | .check_presence = hci_check_presence, | |
943 | .fw_download = hci_fw_download, | |
944 | .discover_se = hci_discover_se, | |
945 | .enable_se = hci_enable_se, | |
946 | .disable_se = hci_disable_se, | |
947 | .se_io = hci_se_io, | |
948 | }; | |
949 | ||
950 | struct nfc_hci_dev *nfc_hci_allocate_device(const struct nfc_hci_ops *ops, | |
951 | struct nfc_hci_init_data *init_data, | |
952 | unsigned long quirks, | |
953 | u32 protocols, | |
954 | const char *llc_name, | |
955 | int tx_headroom, | |
956 | int tx_tailroom, | |
957 | int max_link_payload) | |
958 | { | |
959 | struct nfc_hci_dev *hdev; | |
960 | ||
961 | if (ops->xmit == NULL) | |
962 | return NULL; | |
963 | ||
964 | if (protocols == 0) | |
965 | return NULL; | |
966 | ||
967 | hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); | |
968 | if (hdev == NULL) | |
969 | return NULL; | |
970 | ||
971 | hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit, | |
972 | nfc_hci_recv_from_llc, tx_headroom, | |
973 | tx_tailroom, nfc_hci_llc_failure); | |
974 | if (hdev->llc == NULL) { | |
975 | kfree(hdev); | |
976 | return NULL; | |
977 | } | |
978 | ||
979 | hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, | |
980 | tx_headroom + HCI_CMDS_HEADROOM, | |
981 | tx_tailroom); | |
982 | if (!hdev->ndev) { | |
983 | nfc_llc_free(hdev->llc); | |
984 | kfree(hdev); | |
985 | return NULL; | |
986 | } | |
987 | ||
988 | hdev->ops = ops; | |
989 | hdev->max_data_link_payload = max_link_payload; | |
990 | hdev->init_data = *init_data; | |
991 | ||
992 | nfc_set_drvdata(hdev->ndev, hdev); | |
993 | ||
994 | nfc_hci_reset_pipes(hdev); | |
995 | ||
996 | hdev->quirks = quirks; | |
997 | ||
998 | return hdev; | |
999 | } | |
1000 | EXPORT_SYMBOL(nfc_hci_allocate_device); | |
1001 | ||
1002 | void nfc_hci_free_device(struct nfc_hci_dev *hdev) | |
1003 | { | |
1004 | nfc_free_device(hdev->ndev); | |
1005 | nfc_llc_free(hdev->llc); | |
1006 | kfree(hdev); | |
1007 | } | |
1008 | EXPORT_SYMBOL(nfc_hci_free_device); | |
1009 | ||
1010 | int nfc_hci_register_device(struct nfc_hci_dev *hdev) | |
1011 | { | |
1012 | mutex_init(&hdev->msg_tx_mutex); | |
1013 | ||
1014 | INIT_LIST_HEAD(&hdev->msg_tx_queue); | |
1015 | ||
1016 | INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); | |
1017 | ||
1018 | timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0); | |
1019 | ||
1020 | skb_queue_head_init(&hdev->rx_hcp_frags); | |
1021 | ||
1022 | INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); | |
1023 | ||
1024 | skb_queue_head_init(&hdev->msg_rx_queue); | |
1025 | ||
1026 | return nfc_register_device(hdev->ndev); | |
1027 | } | |
1028 | EXPORT_SYMBOL(nfc_hci_register_device); | |
1029 | ||
1030 | void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) | |
1031 | { | |
1032 | struct hci_msg *msg, *n; | |
1033 | ||
1034 | mutex_lock(&hdev->msg_tx_mutex); | |
1035 | ||
1036 | if (hdev->cmd_pending_msg) { | |
1037 | if (hdev->cmd_pending_msg->cb) | |
1038 | hdev->cmd_pending_msg->cb( | |
1039 | hdev->cmd_pending_msg->cb_context, | |
1040 | NULL, -ESHUTDOWN); | |
1041 | kfree(hdev->cmd_pending_msg); | |
1042 | hdev->cmd_pending_msg = NULL; | |
1043 | } | |
1044 | ||
1045 | hdev->shutting_down = true; | |
1046 | ||
1047 | mutex_unlock(&hdev->msg_tx_mutex); | |
1048 | ||
1049 | del_timer_sync(&hdev->cmd_timer); | |
1050 | cancel_work_sync(&hdev->msg_tx_work); | |
1051 | ||
1052 | cancel_work_sync(&hdev->msg_rx_work); | |
1053 | ||
1054 | nfc_unregister_device(hdev->ndev); | |
1055 | ||
1056 | skb_queue_purge(&hdev->rx_hcp_frags); | |
1057 | skb_queue_purge(&hdev->msg_rx_queue); | |
1058 | ||
1059 | list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) { | |
1060 | list_del(&msg->msg_l); | |
1061 | skb_queue_purge(&msg->msg_frags); | |
1062 | kfree(msg); | |
1063 | } | |
1064 | } | |
1065 | EXPORT_SYMBOL(nfc_hci_unregister_device); | |
1066 | ||
1067 | void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) | |
1068 | { | |
1069 | hdev->clientdata = clientdata; | |
1070 | } | |
1071 | EXPORT_SYMBOL(nfc_hci_set_clientdata); | |
1072 | ||
1073 | void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) | |
1074 | { | |
1075 | return hdev->clientdata; | |
1076 | } | |
1077 | EXPORT_SYMBOL(nfc_hci_get_clientdata); | |
1078 | ||
1079 | void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) | |
1080 | { | |
1081 | nfc_hci_failure(hdev, err); | |
1082 | } | |
1083 | EXPORT_SYMBOL(nfc_hci_driver_failure); | |
1084 | ||
1085 | void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) | |
1086 | { | |
1087 | nfc_llc_rcv_from_drv(hdev->llc, skb); | |
1088 | } | |
1089 | EXPORT_SYMBOL(nfc_hci_recv_frame); | |
1090 | ||
1091 | static int __init nfc_hci_init(void) | |
1092 | { | |
1093 | return nfc_llc_init(); | |
1094 | } | |
1095 | ||
1096 | static void __exit nfc_hci_exit(void) | |
1097 | { | |
1098 | nfc_llc_exit(); | |
1099 | } | |
1100 | ||
1101 | subsys_initcall(nfc_hci_init); | |
1102 | module_exit(nfc_hci_exit); | |
1103 | ||
1104 | MODULE_LICENSE("GPL"); | |
1105 | MODULE_DESCRIPTION("NFC HCI Core"); |