Commit | Line | Data |
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8b8d2e08 EL |
1 | /* |
2 | * Copyright (C) 2012 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the | |
16 | * Free Software Foundation, Inc., | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) "hci: %s: " fmt, __func__ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/nfc.h> | |
26 | ||
27 | #include <net/nfc/nfc.h> | |
28 | #include <net/nfc/hci.h> | |
29 | ||
30 | #include "hci.h" | |
31 | ||
32 | /* Largest headroom needed for outgoing HCI commands */ | |
33 | #define HCI_CMDS_HEADROOM 1 | |
34 | ||
35 | static void nfc_hci_msg_tx_work(struct work_struct *work) | |
36 | { | |
37 | struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, | |
38 | msg_tx_work); | |
39 | struct hci_msg *msg; | |
40 | struct sk_buff *skb; | |
41 | int r = 0; | |
42 | ||
43 | mutex_lock(&hdev->msg_tx_mutex); | |
44 | ||
45 | if (hdev->cmd_pending_msg) { | |
46 | if (timer_pending(&hdev->cmd_timer) == 0) { | |
47 | if (hdev->cmd_pending_msg->cb) | |
48 | hdev->cmd_pending_msg->cb(hdev, | |
49 | NFC_HCI_ANY_E_TIMEOUT, | |
50 | NULL, | |
51 | hdev-> | |
52 | cmd_pending_msg-> | |
53 | cb_context); | |
54 | kfree(hdev->cmd_pending_msg); | |
55 | hdev->cmd_pending_msg = NULL; | |
56 | } else | |
57 | goto exit; | |
58 | } | |
59 | ||
60 | next_msg: | |
61 | if (list_empty(&hdev->msg_tx_queue)) | |
62 | goto exit; | |
63 | ||
64 | msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l); | |
65 | list_del(&msg->msg_l); | |
66 | ||
67 | pr_debug("msg_tx_queue has a cmd to send\n"); | |
68 | while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) { | |
69 | r = hdev->ops->xmit(hdev, skb); | |
70 | if (r < 0) { | |
71 | kfree_skb(skb); | |
72 | skb_queue_purge(&msg->msg_frags); | |
73 | if (msg->cb) | |
74 | msg->cb(hdev, NFC_HCI_ANY_E_NOK, NULL, | |
75 | msg->cb_context); | |
76 | kfree(msg); | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
81 | if (r) | |
82 | goto next_msg; | |
83 | ||
84 | if (msg->wait_response == false) { | |
85 | kfree(msg); | |
86 | goto next_msg; | |
87 | } | |
88 | ||
89 | hdev->cmd_pending_msg = msg; | |
90 | mod_timer(&hdev->cmd_timer, jiffies + | |
91 | msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay)); | |
92 | ||
93 | exit: | |
94 | mutex_unlock(&hdev->msg_tx_mutex); | |
95 | } | |
96 | ||
97 | static void nfc_hci_msg_rx_work(struct work_struct *work) | |
98 | { | |
99 | struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, | |
100 | msg_rx_work); | |
101 | struct sk_buff *skb; | |
102 | struct hcp_message *message; | |
103 | u8 pipe; | |
104 | u8 type; | |
105 | u8 instruction; | |
106 | ||
107 | while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { | |
108 | pipe = skb->data[0]; | |
109 | skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN); | |
110 | message = (struct hcp_message *)skb->data; | |
111 | type = HCP_MSG_GET_TYPE(message->header); | |
112 | instruction = HCP_MSG_GET_CMD(message->header); | |
113 | skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN); | |
114 | ||
115 | nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); | |
116 | } | |
117 | } | |
118 | ||
119 | void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result, | |
120 | struct sk_buff *skb) | |
121 | { | |
122 | mutex_lock(&hdev->msg_tx_mutex); | |
123 | ||
124 | if (hdev->cmd_pending_msg == NULL) { | |
125 | kfree_skb(skb); | |
126 | goto exit; | |
127 | } | |
128 | ||
129 | del_timer_sync(&hdev->cmd_timer); | |
130 | ||
131 | if (hdev->cmd_pending_msg->cb) | |
132 | hdev->cmd_pending_msg->cb(hdev, result, skb, | |
133 | hdev->cmd_pending_msg->cb_context); | |
134 | else | |
135 | kfree_skb(skb); | |
136 | ||
137 | kfree(hdev->cmd_pending_msg); | |
138 | hdev->cmd_pending_msg = NULL; | |
139 | ||
140 | queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work); | |
141 | ||
142 | exit: | |
143 | mutex_unlock(&hdev->msg_tx_mutex); | |
144 | } | |
145 | ||
146 | void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, | |
147 | struct sk_buff *skb) | |
148 | { | |
149 | kfree_skb(skb); | |
150 | } | |
151 | ||
152 | static u32 nfc_hci_sak_to_protocol(u8 sak) | |
153 | { | |
154 | switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { | |
155 | case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: | |
156 | return NFC_PROTO_MIFARE_MASK; | |
157 | case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: | |
158 | return NFC_PROTO_ISO14443_MASK; | |
159 | case NFC_HCI_TYPE_A_SEL_PROT_DEP: | |
160 | return NFC_PROTO_NFC_DEP_MASK; | |
161 | case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: | |
162 | return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; | |
163 | default: | |
164 | return 0xffffffff; | |
165 | } | |
166 | } | |
167 | ||
168 | static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) | |
169 | { | |
170 | struct nfc_target *targets; | |
171 | struct sk_buff *atqa_skb = NULL; | |
172 | struct sk_buff *sak_skb = NULL; | |
173 | int r; | |
174 | ||
175 | pr_debug("from gate %d\n", gate); | |
176 | ||
177 | targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); | |
178 | if (targets == NULL) | |
179 | return -ENOMEM; | |
180 | ||
181 | switch (gate) { | |
182 | case NFC_HCI_RF_READER_A_GATE: | |
183 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
184 | NFC_HCI_RF_READER_A_ATQA, &atqa_skb); | |
185 | if (r < 0) | |
186 | goto exit; | |
187 | ||
188 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
189 | NFC_HCI_RF_READER_A_SAK, &sak_skb); | |
190 | if (r < 0) | |
191 | goto exit; | |
192 | ||
193 | if (atqa_skb->len != 2 || sak_skb->len != 1) { | |
194 | r = -EPROTO; | |
195 | goto exit; | |
196 | } | |
197 | ||
198 | targets->supported_protocols = | |
199 | nfc_hci_sak_to_protocol(sak_skb->data[0]); | |
200 | if (targets->supported_protocols == 0xffffffff) { | |
201 | r = -EPROTO; | |
202 | goto exit; | |
203 | } | |
204 | ||
205 | targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data); | |
206 | targets->sel_res = sak_skb->data[0]; | |
207 | ||
208 | if (hdev->ops->complete_target_discovered) { | |
209 | r = hdev->ops->complete_target_discovered(hdev, gate, | |
210 | targets); | |
211 | if (r < 0) | |
212 | goto exit; | |
213 | } | |
214 | break; | |
215 | case NFC_HCI_RF_READER_B_GATE: | |
216 | targets->supported_protocols = NFC_PROTO_ISO14443_MASK; | |
217 | break; | |
218 | default: | |
219 | if (hdev->ops->target_from_gate) | |
220 | r = hdev->ops->target_from_gate(hdev, gate, targets); | |
221 | else | |
222 | r = -EPROTO; | |
223 | if (r < 0) | |
224 | goto exit; | |
225 | ||
226 | if (hdev->ops->complete_target_discovered) { | |
227 | r = hdev->ops->complete_target_discovered(hdev, gate, | |
228 | targets); | |
229 | if (r < 0) | |
230 | goto exit; | |
231 | } | |
232 | break; | |
233 | } | |
234 | ||
235 | targets->hci_reader_gate = gate; | |
236 | ||
237 | r = nfc_targets_found(hdev->ndev, targets, 1); | |
8b8d2e08 EL |
238 | |
239 | exit: | |
240 | kfree(targets); | |
241 | kfree_skb(atqa_skb); | |
242 | kfree_skb(sak_skb); | |
243 | ||
244 | return r; | |
245 | } | |
246 | ||
247 | void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, | |
248 | struct sk_buff *skb) | |
249 | { | |
250 | int r = 0; | |
251 | ||
252 | switch (event) { | |
253 | case NFC_HCI_EVT_TARGET_DISCOVERED: | |
8b8d2e08 EL |
254 | if (skb->len < 1) { /* no status data? */ |
255 | r = -EPROTO; | |
256 | goto exit; | |
257 | } | |
258 | ||
259 | if (skb->data[0] == 3) { | |
260 | /* TODO: Multiple targets in field, none activated | |
261 | * poll is supposedly stopped, but there is no | |
262 | * single target to activate, so nothing to report | |
263 | * up. | |
264 | * if we need to restart poll, we must save the | |
265 | * protocols from the initial poll and reuse here. | |
266 | */ | |
267 | } | |
268 | ||
269 | if (skb->data[0] != 0) { | |
270 | r = -EPROTO; | |
271 | goto exit; | |
272 | } | |
273 | ||
274 | r = nfc_hci_target_discovered(hdev, | |
275 | nfc_hci_pipe2gate(hdev, pipe)); | |
276 | break; | |
277 | default: | |
278 | /* TODO: Unknown events are hardware specific | |
279 | * pass them to the driver (needs a new hci_ops) */ | |
280 | break; | |
281 | } | |
282 | ||
283 | exit: | |
284 | kfree_skb(skb); | |
285 | ||
286 | if (r) { | |
287 | /* TODO: There was an error dispatching the event, | |
288 | * how to propagate up to nfc core? | |
289 | */ | |
290 | } | |
291 | } | |
292 | ||
293 | static void nfc_hci_cmd_timeout(unsigned long data) | |
294 | { | |
295 | struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data; | |
296 | ||
297 | queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work); | |
298 | } | |
299 | ||
300 | static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, | |
301 | u8 gates[]) | |
302 | { | |
303 | int r; | |
304 | u8 *p = gates; | |
305 | while (gate_count--) { | |
306 | r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p); | |
307 | if (r < 0) | |
308 | return r; | |
309 | p++; | |
310 | } | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static int hci_dev_session_init(struct nfc_hci_dev *hdev) | |
316 | { | |
317 | struct sk_buff *skb = NULL; | |
318 | int r; | |
319 | u8 hci_gates[] = { /* NFC_HCI_ADMIN_GATE MUST be first */ | |
320 | NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE, | |
321 | NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE, | |
322 | NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE | |
323 | }; | |
324 | ||
325 | r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, | |
326 | NFC_HCI_ADMIN_GATE); | |
327 | if (r < 0) | |
328 | goto exit; | |
329 | ||
330 | r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, | |
331 | NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); | |
332 | if (r < 0) | |
333 | goto disconnect_all; | |
334 | ||
335 | if (skb->len && skb->len == strlen(hdev->init_data.session_id)) | |
336 | if (memcmp(hdev->init_data.session_id, skb->data, | |
337 | skb->len) == 0) { | |
338 | /* TODO ELa: restore gate<->pipe table from | |
339 | * some TBD location. | |
340 | * note: it doesn't seem possible to get the chip | |
341 | * currently open gate/pipe table. | |
342 | * It is only possible to obtain the supported | |
343 | * gate list. | |
344 | */ | |
345 | ||
346 | /* goto exit | |
347 | * For now, always do a full initialization */ | |
348 | } | |
349 | ||
350 | r = nfc_hci_disconnect_all_gates(hdev); | |
351 | if (r < 0) | |
352 | goto exit; | |
353 | ||
354 | r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates); | |
355 | if (r < 0) | |
356 | goto disconnect_all; | |
357 | ||
358 | r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, | |
359 | hdev->init_data.gates); | |
360 | if (r < 0) | |
361 | goto disconnect_all; | |
362 | ||
363 | r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, | |
364 | NFC_HCI_ADMIN_SESSION_IDENTITY, | |
365 | hdev->init_data.session_id, | |
366 | strlen(hdev->init_data.session_id)); | |
367 | if (r == 0) | |
368 | goto exit; | |
369 | ||
370 | disconnect_all: | |
371 | nfc_hci_disconnect_all_gates(hdev); | |
372 | ||
373 | exit: | |
374 | if (skb) | |
375 | kfree_skb(skb); | |
376 | ||
377 | return r; | |
378 | } | |
379 | ||
380 | static int hci_dev_version(struct nfc_hci_dev *hdev) | |
381 | { | |
382 | int r; | |
383 | struct sk_buff *skb; | |
384 | ||
385 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
386 | NFC_HCI_ID_MGMT_VERSION_SW, &skb); | |
387 | if (r < 0) | |
388 | return r; | |
389 | ||
390 | if (skb->len != 3) { | |
391 | kfree_skb(skb); | |
392 | return -EINVAL; | |
393 | } | |
394 | ||
395 | hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; | |
396 | hdev->sw_patch = skb->data[0] & 0x0f; | |
397 | hdev->sw_flashlib_major = skb->data[1]; | |
398 | hdev->sw_flashlib_minor = skb->data[2]; | |
399 | ||
400 | kfree_skb(skb); | |
401 | ||
402 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
403 | NFC_HCI_ID_MGMT_VERSION_HW, &skb); | |
404 | if (r < 0) | |
405 | return r; | |
406 | ||
407 | if (skb->len != 3) { | |
408 | kfree_skb(skb); | |
409 | return -EINVAL; | |
410 | } | |
411 | ||
412 | hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; | |
413 | hdev->hw_version = skb->data[0] & 0x1f; | |
414 | hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; | |
415 | hdev->hw_software = skb->data[1] & 0x3f; | |
416 | hdev->hw_bsid = skb->data[2]; | |
417 | ||
418 | kfree_skb(skb); | |
419 | ||
420 | pr_info("SOFTWARE INFO:\n"); | |
421 | pr_info("RomLib : %d\n", hdev->sw_romlib); | |
422 | pr_info("Patch : %d\n", hdev->sw_patch); | |
423 | pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); | |
424 | pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); | |
425 | pr_info("HARDWARE INFO:\n"); | |
426 | pr_info("Derivative : %d\n", hdev->hw_derivative); | |
427 | pr_info("HW Version : %d\n", hdev->hw_version); | |
428 | pr_info("#MPW : %d\n", hdev->hw_mpw); | |
429 | pr_info("Software : %d\n", hdev->hw_software); | |
430 | pr_info("BSID Version : %d\n", hdev->hw_bsid); | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | static int hci_dev_up(struct nfc_dev *nfc_dev) | |
436 | { | |
437 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
438 | int r = 0; | |
439 | ||
440 | if (hdev->ops->open) { | |
441 | r = hdev->ops->open(hdev); | |
442 | if (r < 0) | |
443 | return r; | |
444 | } | |
445 | ||
446 | r = hci_dev_session_init(hdev); | |
447 | if (r < 0) | |
448 | goto exit; | |
449 | ||
450 | r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
451 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
452 | if (r < 0) | |
453 | goto exit; | |
454 | ||
455 | if (hdev->ops->hci_ready) { | |
456 | r = hdev->ops->hci_ready(hdev); | |
457 | if (r < 0) | |
458 | goto exit; | |
459 | } | |
460 | ||
461 | r = hci_dev_version(hdev); | |
462 | if (r < 0) | |
463 | goto exit; | |
464 | ||
465 | exit: | |
466 | if (r < 0) | |
467 | if (hdev->ops->close) | |
468 | hdev->ops->close(hdev); | |
469 | return r; | |
470 | } | |
471 | ||
472 | static int hci_dev_down(struct nfc_dev *nfc_dev) | |
473 | { | |
474 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
475 | ||
476 | if (hdev->ops->close) | |
477 | hdev->ops->close(hdev); | |
478 | ||
479 | memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
fe7c5800 SO |
484 | static int hci_start_poll(struct nfc_dev *nfc_dev, |
485 | u32 im_protocols, u32 tm_protocols) | |
8b8d2e08 EL |
486 | { |
487 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
8b8d2e08 EL |
488 | |
489 | if (hdev->ops->start_poll) | |
fe7c5800 | 490 | return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); |
8b8d2e08 | 491 | else |
03bed29e | 492 | return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, |
8b8d2e08 | 493 | NFC_HCI_EVT_READER_REQUESTED, NULL, 0); |
8b8d2e08 EL |
494 | } |
495 | ||
496 | static void hci_stop_poll(struct nfc_dev *nfc_dev) | |
497 | { | |
498 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
499 | ||
03bed29e EL |
500 | nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, |
501 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
8b8d2e08 EL |
502 | } |
503 | ||
90099433 EL |
504 | static int hci_activate_target(struct nfc_dev *nfc_dev, |
505 | struct nfc_target *target, u32 protocol) | |
8b8d2e08 | 506 | { |
8b8d2e08 EL |
507 | return 0; |
508 | } | |
509 | ||
90099433 EL |
510 | static void hci_deactivate_target(struct nfc_dev *nfc_dev, |
511 | struct nfc_target *target) | |
8b8d2e08 EL |
512 | { |
513 | } | |
514 | ||
be9ae4ce SO |
515 | static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, |
516 | struct sk_buff *skb, data_exchange_cb_t cb, | |
517 | void *cb_context) | |
8b8d2e08 EL |
518 | { |
519 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
520 | int r; | |
8b8d2e08 EL |
521 | struct sk_buff *res_skb = NULL; |
522 | ||
90099433 | 523 | pr_debug("target_idx=%d\n", target->idx); |
8b8d2e08 EL |
524 | |
525 | switch (target->hci_reader_gate) { | |
526 | case NFC_HCI_RF_READER_A_GATE: | |
527 | case NFC_HCI_RF_READER_B_GATE: | |
528 | if (hdev->ops->data_exchange) { | |
529 | r = hdev->ops->data_exchange(hdev, target, skb, | |
530 | &res_skb); | |
531 | if (r <= 0) /* handled */ | |
532 | break; | |
533 | } | |
534 | ||
535 | *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ | |
536 | r = nfc_hci_send_cmd(hdev, target->hci_reader_gate, | |
537 | NFC_HCI_WR_XCHG_DATA, | |
538 | skb->data, skb->len, &res_skb); | |
539 | /* | |
540 | * TODO: Check RF Error indicator to make sure data is valid. | |
541 | * It seems that HCI cmd can complete without error, but data | |
542 | * can be invalid if an RF error occured? Ignore for now. | |
543 | */ | |
544 | if (r == 0) | |
545 | skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */ | |
546 | break; | |
547 | default: | |
548 | if (hdev->ops->data_exchange) { | |
549 | r = hdev->ops->data_exchange(hdev, target, skb, | |
550 | &res_skb); | |
551 | if (r == 1) | |
552 | r = -ENOTSUPP; | |
553 | } | |
554 | else | |
555 | r = -ENOTSUPP; | |
556 | } | |
557 | ||
558 | kfree_skb(skb); | |
559 | ||
560 | cb(cb_context, res_skb, r); | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
1676f751 EL |
565 | static int hci_check_presence(struct nfc_dev *nfc_dev, |
566 | struct nfc_target *target) | |
567 | { | |
568 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
569 | ||
570 | if (hdev->ops->check_presence) | |
571 | return hdev->ops->check_presence(hdev, target); | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
bd007bea | 576 | static struct nfc_ops hci_nfc_ops = { |
8b8d2e08 EL |
577 | .dev_up = hci_dev_up, |
578 | .dev_down = hci_dev_down, | |
579 | .start_poll = hci_start_poll, | |
580 | .stop_poll = hci_stop_poll, | |
581 | .activate_target = hci_activate_target, | |
582 | .deactivate_target = hci_deactivate_target, | |
be9ae4ce | 583 | .im_transceive = hci_transceive, |
1676f751 | 584 | .check_presence = hci_check_presence, |
8b8d2e08 EL |
585 | }; |
586 | ||
587 | struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, | |
588 | struct nfc_hci_init_data *init_data, | |
589 | u32 protocols, | |
590 | int tx_headroom, | |
591 | int tx_tailroom, | |
592 | int max_link_payload) | |
593 | { | |
594 | struct nfc_hci_dev *hdev; | |
595 | ||
596 | if (ops->xmit == NULL) | |
597 | return NULL; | |
598 | ||
599 | if (protocols == 0) | |
600 | return NULL; | |
601 | ||
602 | hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); | |
603 | if (hdev == NULL) | |
604 | return NULL; | |
605 | ||
606 | hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, | |
607 | tx_headroom + HCI_CMDS_HEADROOM, | |
608 | tx_tailroom); | |
609 | if (!hdev->ndev) { | |
610 | kfree(hdev); | |
611 | return NULL; | |
612 | } | |
613 | ||
614 | hdev->ops = ops; | |
615 | hdev->max_data_link_payload = max_link_payload; | |
616 | hdev->init_data = *init_data; | |
617 | ||
618 | nfc_set_drvdata(hdev->ndev, hdev); | |
619 | ||
620 | memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); | |
621 | ||
622 | return hdev; | |
623 | } | |
624 | EXPORT_SYMBOL(nfc_hci_allocate_device); | |
625 | ||
626 | void nfc_hci_free_device(struct nfc_hci_dev *hdev) | |
627 | { | |
628 | nfc_free_device(hdev->ndev); | |
629 | kfree(hdev); | |
630 | } | |
631 | EXPORT_SYMBOL(nfc_hci_free_device); | |
632 | ||
633 | int nfc_hci_register_device(struct nfc_hci_dev *hdev) | |
634 | { | |
635 | struct device *dev = &hdev->ndev->dev; | |
636 | const char *devname = dev_name(dev); | |
637 | char name[32]; | |
638 | int r = 0; | |
639 | ||
640 | mutex_init(&hdev->msg_tx_mutex); | |
641 | ||
642 | INIT_LIST_HEAD(&hdev->msg_tx_queue); | |
643 | ||
644 | INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); | |
645 | snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname); | |
646 | hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | | |
647 | WQ_MEM_RECLAIM, 1); | |
648 | if (hdev->msg_tx_wq == NULL) { | |
649 | r = -ENOMEM; | |
650 | goto exit; | |
651 | } | |
652 | ||
653 | init_timer(&hdev->cmd_timer); | |
654 | hdev->cmd_timer.data = (unsigned long)hdev; | |
655 | hdev->cmd_timer.function = nfc_hci_cmd_timeout; | |
656 | ||
657 | skb_queue_head_init(&hdev->rx_hcp_frags); | |
658 | ||
659 | INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); | |
660 | snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname); | |
661 | hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | | |
662 | WQ_MEM_RECLAIM, 1); | |
663 | if (hdev->msg_rx_wq == NULL) { | |
664 | r = -ENOMEM; | |
665 | goto exit; | |
666 | } | |
667 | ||
668 | skb_queue_head_init(&hdev->msg_rx_queue); | |
669 | ||
670 | r = nfc_register_device(hdev->ndev); | |
671 | ||
672 | exit: | |
673 | if (r < 0) { | |
674 | if (hdev->msg_tx_wq) | |
675 | destroy_workqueue(hdev->msg_tx_wq); | |
676 | if (hdev->msg_rx_wq) | |
677 | destroy_workqueue(hdev->msg_rx_wq); | |
678 | } | |
679 | ||
680 | return r; | |
681 | } | |
682 | EXPORT_SYMBOL(nfc_hci_register_device); | |
683 | ||
684 | void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) | |
685 | { | |
686 | struct hci_msg *msg; | |
687 | ||
688 | skb_queue_purge(&hdev->rx_hcp_frags); | |
689 | skb_queue_purge(&hdev->msg_rx_queue); | |
690 | ||
691 | while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, | |
692 | msg_l)) != NULL) { | |
693 | list_del(&msg->msg_l); | |
694 | skb_queue_purge(&msg->msg_frags); | |
695 | kfree(msg); | |
696 | } | |
697 | ||
698 | del_timer_sync(&hdev->cmd_timer); | |
699 | ||
700 | nfc_unregister_device(hdev->ndev); | |
701 | ||
702 | destroy_workqueue(hdev->msg_tx_wq); | |
703 | ||
704 | destroy_workqueue(hdev->msg_rx_wq); | |
705 | } | |
706 | EXPORT_SYMBOL(nfc_hci_unregister_device); | |
707 | ||
708 | void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) | |
709 | { | |
710 | hdev->clientdata = clientdata; | |
711 | } | |
712 | EXPORT_SYMBOL(nfc_hci_set_clientdata); | |
713 | ||
714 | void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) | |
715 | { | |
716 | return hdev->clientdata; | |
717 | } | |
718 | EXPORT_SYMBOL(nfc_hci_get_clientdata); | |
719 | ||
72b06f75 | 720 | static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) |
a9a741a7 | 721 | { |
72b06f75 EL |
722 | /* |
723 | * TODO: lower layer has permanent failure. | |
a9a741a7 EL |
724 | * complete potential HCI command or send an empty tag discovered event |
725 | */ | |
726 | } | |
72b06f75 EL |
727 | |
728 | void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) | |
729 | { | |
730 | nfc_hci_failure(hdev, err); | |
731 | } | |
a9a741a7 EL |
732 | EXPORT_SYMBOL(nfc_hci_driver_failure); |
733 | ||
8b8d2e08 EL |
734 | void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) |
735 | { | |
736 | struct hcp_packet *packet; | |
737 | u8 type; | |
738 | u8 instruction; | |
739 | struct sk_buff *hcp_skb; | |
740 | u8 pipe; | |
741 | struct sk_buff *frag_skb; | |
742 | int msg_len; | |
743 | ||
8b8d2e08 EL |
744 | packet = (struct hcp_packet *)skb->data; |
745 | if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { | |
746 | skb_queue_tail(&hdev->rx_hcp_frags, skb); | |
747 | return; | |
748 | } | |
749 | ||
750 | /* it's the last fragment. Does it need re-aggregation? */ | |
751 | if (skb_queue_len(&hdev->rx_hcp_frags)) { | |
752 | pipe = packet->header & NFC_HCI_FRAGMENT; | |
753 | skb_queue_tail(&hdev->rx_hcp_frags, skb); | |
754 | ||
755 | msg_len = 0; | |
756 | skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { | |
757 | msg_len += (frag_skb->len - | |
758 | NFC_HCI_HCP_PACKET_HEADER_LEN); | |
759 | } | |
760 | ||
761 | hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + | |
762 | msg_len, GFP_KERNEL); | |
763 | if (hcp_skb == NULL) { | |
72b06f75 EL |
764 | nfc_hci_failure(hdev, -ENOMEM); |
765 | return; | |
8b8d2e08 EL |
766 | } |
767 | ||
768 | *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; | |
769 | ||
770 | skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { | |
771 | msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; | |
772 | memcpy(skb_put(hcp_skb, msg_len), | |
773 | frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, | |
774 | msg_len); | |
775 | } | |
776 | ||
777 | skb_queue_purge(&hdev->rx_hcp_frags); | |
778 | } else { | |
779 | packet->header &= NFC_HCI_FRAGMENT; | |
780 | hcp_skb = skb; | |
781 | } | |
782 | ||
783 | /* if this is a response, dispatch immediately to | |
784 | * unblock waiting cmd context. Otherwise, enqueue to dispatch | |
785 | * in separate context where handler can also execute command. | |
786 | */ | |
787 | packet = (struct hcp_packet *)hcp_skb->data; | |
788 | type = HCP_MSG_GET_TYPE(packet->message.header); | |
789 | if (type == NFC_HCI_HCP_RESPONSE) { | |
790 | pipe = packet->header; | |
791 | instruction = HCP_MSG_GET_CMD(packet->message.header); | |
792 | skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + | |
793 | NFC_HCI_HCP_MESSAGE_HEADER_LEN); | |
794 | nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); | |
795 | } else { | |
796 | skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); | |
797 | queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work); | |
798 | } | |
799 | } | |
800 | EXPORT_SYMBOL(nfc_hci_recv_frame); | |
801 | ||
802 | MODULE_LICENSE("GPL"); |