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 | ||
6c1c5b9e EL |
35 | static int nfc_hci_result_to_errno(u8 result) |
36 | { | |
37 | switch (result) { | |
38 | case NFC_HCI_ANY_OK: | |
39 | return 0; | |
40 | case NFC_HCI_ANY_E_TIMEOUT: | |
41 | return -ETIME; | |
42 | default: | |
43 | return -1; | |
44 | } | |
45 | } | |
46 | ||
8b8d2e08 EL |
47 | static void nfc_hci_msg_tx_work(struct work_struct *work) |
48 | { | |
49 | struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, | |
50 | msg_tx_work); | |
51 | struct hci_msg *msg; | |
52 | struct sk_buff *skb; | |
53 | int r = 0; | |
54 | ||
55 | mutex_lock(&hdev->msg_tx_mutex); | |
56 | ||
57 | if (hdev->cmd_pending_msg) { | |
58 | if (timer_pending(&hdev->cmd_timer) == 0) { | |
59 | if (hdev->cmd_pending_msg->cb) | |
60 | hdev->cmd_pending_msg->cb(hdev, | |
6c1c5b9e | 61 | -ETIME, |
8b8d2e08 EL |
62 | NULL, |
63 | hdev-> | |
64 | cmd_pending_msg-> | |
65 | cb_context); | |
66 | kfree(hdev->cmd_pending_msg); | |
67 | hdev->cmd_pending_msg = NULL; | |
68 | } else | |
69 | goto exit; | |
70 | } | |
71 | ||
72 | next_msg: | |
73 | if (list_empty(&hdev->msg_tx_queue)) | |
74 | goto exit; | |
75 | ||
76 | msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l); | |
77 | list_del(&msg->msg_l); | |
78 | ||
79 | pr_debug("msg_tx_queue has a cmd to send\n"); | |
80 | while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) { | |
81 | r = hdev->ops->xmit(hdev, skb); | |
82 | if (r < 0) { | |
83 | kfree_skb(skb); | |
84 | skb_queue_purge(&msg->msg_frags); | |
85 | if (msg->cb) | |
6c1c5b9e | 86 | msg->cb(hdev, r, NULL, msg->cb_context); |
8b8d2e08 EL |
87 | kfree(msg); |
88 | break; | |
89 | } | |
90 | } | |
91 | ||
92 | if (r) | |
93 | goto next_msg; | |
94 | ||
95 | if (msg->wait_response == false) { | |
96 | kfree(msg); | |
97 | goto next_msg; | |
98 | } | |
99 | ||
100 | hdev->cmd_pending_msg = msg; | |
101 | mod_timer(&hdev->cmd_timer, jiffies + | |
102 | msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay)); | |
103 | ||
104 | exit: | |
105 | mutex_unlock(&hdev->msg_tx_mutex); | |
106 | } | |
107 | ||
108 | static void nfc_hci_msg_rx_work(struct work_struct *work) | |
109 | { | |
110 | struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev, | |
111 | msg_rx_work); | |
112 | struct sk_buff *skb; | |
113 | struct hcp_message *message; | |
114 | u8 pipe; | |
115 | u8 type; | |
116 | u8 instruction; | |
117 | ||
118 | while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) { | |
119 | pipe = skb->data[0]; | |
120 | skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN); | |
121 | message = (struct hcp_message *)skb->data; | |
122 | type = HCP_MSG_GET_TYPE(message->header); | |
123 | instruction = HCP_MSG_GET_CMD(message->header); | |
124 | skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN); | |
125 | ||
126 | nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb); | |
127 | } | |
128 | } | |
129 | ||
ccca0d6e EL |
130 | static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err, |
131 | struct sk_buff *skb) | |
8b8d2e08 | 132 | { |
8b8d2e08 EL |
133 | del_timer_sync(&hdev->cmd_timer); |
134 | ||
135 | if (hdev->cmd_pending_msg->cb) | |
ccca0d6e | 136 | hdev->cmd_pending_msg->cb(hdev, err, skb, |
8b8d2e08 EL |
137 | hdev->cmd_pending_msg->cb_context); |
138 | else | |
139 | kfree_skb(skb); | |
140 | ||
141 | kfree(hdev->cmd_pending_msg); | |
142 | hdev->cmd_pending_msg = NULL; | |
143 | ||
144 | queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work); | |
ccca0d6e EL |
145 | } |
146 | ||
147 | void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result, | |
148 | struct sk_buff *skb) | |
149 | { | |
150 | mutex_lock(&hdev->msg_tx_mutex); | |
151 | ||
152 | if (hdev->cmd_pending_msg == NULL) { | |
153 | kfree_skb(skb); | |
154 | goto exit; | |
155 | } | |
156 | ||
157 | __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb); | |
8b8d2e08 EL |
158 | |
159 | exit: | |
160 | mutex_unlock(&hdev->msg_tx_mutex); | |
161 | } | |
162 | ||
163 | void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, | |
164 | struct sk_buff *skb) | |
165 | { | |
166 | kfree_skb(skb); | |
167 | } | |
168 | ||
169 | static u32 nfc_hci_sak_to_protocol(u8 sak) | |
170 | { | |
171 | switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) { | |
172 | case NFC_HCI_TYPE_A_SEL_PROT_MIFARE: | |
173 | return NFC_PROTO_MIFARE_MASK; | |
174 | case NFC_HCI_TYPE_A_SEL_PROT_ISO14443: | |
175 | return NFC_PROTO_ISO14443_MASK; | |
176 | case NFC_HCI_TYPE_A_SEL_PROT_DEP: | |
177 | return NFC_PROTO_NFC_DEP_MASK; | |
178 | case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP: | |
179 | return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK; | |
180 | default: | |
181 | return 0xffffffff; | |
182 | } | |
183 | } | |
184 | ||
185 | static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate) | |
186 | { | |
187 | struct nfc_target *targets; | |
188 | struct sk_buff *atqa_skb = NULL; | |
189 | struct sk_buff *sak_skb = NULL; | |
190 | int r; | |
191 | ||
192 | pr_debug("from gate %d\n", gate); | |
193 | ||
194 | targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL); | |
195 | if (targets == NULL) | |
196 | return -ENOMEM; | |
197 | ||
198 | switch (gate) { | |
199 | case NFC_HCI_RF_READER_A_GATE: | |
200 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
201 | NFC_HCI_RF_READER_A_ATQA, &atqa_skb); | |
202 | if (r < 0) | |
203 | goto exit; | |
204 | ||
205 | r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE, | |
206 | NFC_HCI_RF_READER_A_SAK, &sak_skb); | |
207 | if (r < 0) | |
208 | goto exit; | |
209 | ||
210 | if (atqa_skb->len != 2 || sak_skb->len != 1) { | |
211 | r = -EPROTO; | |
212 | goto exit; | |
213 | } | |
214 | ||
215 | targets->supported_protocols = | |
216 | nfc_hci_sak_to_protocol(sak_skb->data[0]); | |
217 | if (targets->supported_protocols == 0xffffffff) { | |
218 | r = -EPROTO; | |
219 | goto exit; | |
220 | } | |
221 | ||
222 | targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data); | |
223 | targets->sel_res = sak_skb->data[0]; | |
224 | ||
225 | if (hdev->ops->complete_target_discovered) { | |
226 | r = hdev->ops->complete_target_discovered(hdev, gate, | |
227 | targets); | |
228 | if (r < 0) | |
229 | goto exit; | |
230 | } | |
231 | break; | |
232 | case NFC_HCI_RF_READER_B_GATE: | |
233 | targets->supported_protocols = NFC_PROTO_ISO14443_MASK; | |
234 | break; | |
235 | default: | |
236 | if (hdev->ops->target_from_gate) | |
237 | r = hdev->ops->target_from_gate(hdev, gate, targets); | |
238 | else | |
239 | r = -EPROTO; | |
240 | if (r < 0) | |
241 | goto exit; | |
242 | ||
243 | if (hdev->ops->complete_target_discovered) { | |
244 | r = hdev->ops->complete_target_discovered(hdev, gate, | |
245 | targets); | |
246 | if (r < 0) | |
247 | goto exit; | |
248 | } | |
249 | break; | |
250 | } | |
251 | ||
252 | targets->hci_reader_gate = gate; | |
253 | ||
254 | r = nfc_targets_found(hdev->ndev, targets, 1); | |
8b8d2e08 EL |
255 | |
256 | exit: | |
257 | kfree(targets); | |
258 | kfree_skb(atqa_skb); | |
259 | kfree_skb(sak_skb); | |
260 | ||
261 | return r; | |
262 | } | |
263 | ||
264 | void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event, | |
265 | struct sk_buff *skb) | |
266 | { | |
267 | int r = 0; | |
268 | ||
269 | switch (event) { | |
270 | case NFC_HCI_EVT_TARGET_DISCOVERED: | |
8b8d2e08 EL |
271 | if (skb->len < 1) { /* no status data? */ |
272 | r = -EPROTO; | |
273 | goto exit; | |
274 | } | |
275 | ||
276 | if (skb->data[0] == 3) { | |
277 | /* TODO: Multiple targets in field, none activated | |
278 | * poll is supposedly stopped, but there is no | |
279 | * single target to activate, so nothing to report | |
280 | * up. | |
281 | * if we need to restart poll, we must save the | |
282 | * protocols from the initial poll and reuse here. | |
283 | */ | |
284 | } | |
285 | ||
286 | if (skb->data[0] != 0) { | |
287 | r = -EPROTO; | |
288 | goto exit; | |
289 | } | |
290 | ||
291 | r = nfc_hci_target_discovered(hdev, | |
292 | nfc_hci_pipe2gate(hdev, pipe)); | |
293 | break; | |
294 | default: | |
295 | /* TODO: Unknown events are hardware specific | |
296 | * pass them to the driver (needs a new hci_ops) */ | |
297 | break; | |
298 | } | |
299 | ||
300 | exit: | |
301 | kfree_skb(skb); | |
302 | ||
303 | if (r) { | |
304 | /* TODO: There was an error dispatching the event, | |
305 | * how to propagate up to nfc core? | |
306 | */ | |
307 | } | |
308 | } | |
309 | ||
310 | static void nfc_hci_cmd_timeout(unsigned long data) | |
311 | { | |
312 | struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data; | |
313 | ||
314 | queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work); | |
315 | } | |
316 | ||
317 | static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count, | |
a10d595b | 318 | struct nfc_hci_gate *gates) |
8b8d2e08 EL |
319 | { |
320 | int r; | |
8b8d2e08 | 321 | while (gate_count--) { |
a10d595b EL |
322 | r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, |
323 | gates->gate, gates->pipe); | |
8b8d2e08 EL |
324 | if (r < 0) |
325 | return r; | |
a10d595b | 326 | gates++; |
8b8d2e08 EL |
327 | } |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | static int hci_dev_session_init(struct nfc_hci_dev *hdev) | |
333 | { | |
334 | struct sk_buff *skb = NULL; | |
335 | int r; | |
a10d595b EL |
336 | |
337 | if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE) | |
338 | return -EPROTO; | |
8b8d2e08 EL |
339 | |
340 | r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, | |
a10d595b EL |
341 | hdev->init_data.gates[0].gate, |
342 | hdev->init_data.gates[0].pipe); | |
8b8d2e08 EL |
343 | if (r < 0) |
344 | goto exit; | |
345 | ||
346 | r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE, | |
347 | NFC_HCI_ADMIN_SESSION_IDENTITY, &skb); | |
348 | if (r < 0) | |
349 | goto disconnect_all; | |
350 | ||
351 | if (skb->len && skb->len == strlen(hdev->init_data.session_id)) | |
352 | if (memcmp(hdev->init_data.session_id, skb->data, | |
353 | skb->len) == 0) { | |
354 | /* TODO ELa: restore gate<->pipe table from | |
355 | * some TBD location. | |
356 | * note: it doesn't seem possible to get the chip | |
357 | * currently open gate/pipe table. | |
358 | * It is only possible to obtain the supported | |
359 | * gate list. | |
360 | */ | |
361 | ||
362 | /* goto exit | |
363 | * For now, always do a full initialization */ | |
364 | } | |
365 | ||
366 | r = nfc_hci_disconnect_all_gates(hdev); | |
367 | if (r < 0) | |
368 | goto exit; | |
369 | ||
8b8d2e08 EL |
370 | r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count, |
371 | hdev->init_data.gates); | |
372 | if (r < 0) | |
373 | goto disconnect_all; | |
374 | ||
375 | r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE, | |
376 | NFC_HCI_ADMIN_SESSION_IDENTITY, | |
377 | hdev->init_data.session_id, | |
378 | strlen(hdev->init_data.session_id)); | |
379 | if (r == 0) | |
380 | goto exit; | |
381 | ||
382 | disconnect_all: | |
383 | nfc_hci_disconnect_all_gates(hdev); | |
384 | ||
385 | exit: | |
386 | if (skb) | |
387 | kfree_skb(skb); | |
388 | ||
389 | return r; | |
390 | } | |
391 | ||
392 | static int hci_dev_version(struct nfc_hci_dev *hdev) | |
393 | { | |
394 | int r; | |
395 | struct sk_buff *skb; | |
396 | ||
397 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
398 | NFC_HCI_ID_MGMT_VERSION_SW, &skb); | |
399 | if (r < 0) | |
400 | return r; | |
401 | ||
402 | if (skb->len != 3) { | |
403 | kfree_skb(skb); | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4; | |
408 | hdev->sw_patch = skb->data[0] & 0x0f; | |
409 | hdev->sw_flashlib_major = skb->data[1]; | |
410 | hdev->sw_flashlib_minor = skb->data[2]; | |
411 | ||
412 | kfree_skb(skb); | |
413 | ||
414 | r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE, | |
415 | NFC_HCI_ID_MGMT_VERSION_HW, &skb); | |
416 | if (r < 0) | |
417 | return r; | |
418 | ||
419 | if (skb->len != 3) { | |
420 | kfree_skb(skb); | |
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5; | |
425 | hdev->hw_version = skb->data[0] & 0x1f; | |
426 | hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6; | |
427 | hdev->hw_software = skb->data[1] & 0x3f; | |
428 | hdev->hw_bsid = skb->data[2]; | |
429 | ||
430 | kfree_skb(skb); | |
431 | ||
432 | pr_info("SOFTWARE INFO:\n"); | |
433 | pr_info("RomLib : %d\n", hdev->sw_romlib); | |
434 | pr_info("Patch : %d\n", hdev->sw_patch); | |
435 | pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major); | |
436 | pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor); | |
437 | pr_info("HARDWARE INFO:\n"); | |
438 | pr_info("Derivative : %d\n", hdev->hw_derivative); | |
439 | pr_info("HW Version : %d\n", hdev->hw_version); | |
440 | pr_info("#MPW : %d\n", hdev->hw_mpw); | |
441 | pr_info("Software : %d\n", hdev->hw_software); | |
442 | pr_info("BSID Version : %d\n", hdev->hw_bsid); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int hci_dev_up(struct nfc_dev *nfc_dev) | |
448 | { | |
449 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
450 | int r = 0; | |
451 | ||
452 | if (hdev->ops->open) { | |
453 | r = hdev->ops->open(hdev); | |
454 | if (r < 0) | |
455 | return r; | |
456 | } | |
457 | ||
458 | r = hci_dev_session_init(hdev); | |
459 | if (r < 0) | |
460 | goto exit; | |
461 | ||
462 | r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, | |
463 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
464 | if (r < 0) | |
465 | goto exit; | |
466 | ||
467 | if (hdev->ops->hci_ready) { | |
468 | r = hdev->ops->hci_ready(hdev); | |
469 | if (r < 0) | |
470 | goto exit; | |
471 | } | |
472 | ||
473 | r = hci_dev_version(hdev); | |
474 | if (r < 0) | |
475 | goto exit; | |
476 | ||
477 | exit: | |
478 | if (r < 0) | |
479 | if (hdev->ops->close) | |
480 | hdev->ops->close(hdev); | |
481 | return r; | |
482 | } | |
483 | ||
484 | static int hci_dev_down(struct nfc_dev *nfc_dev) | |
485 | { | |
486 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
487 | ||
488 | if (hdev->ops->close) | |
489 | hdev->ops->close(hdev); | |
490 | ||
491 | memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
fe7c5800 SO |
496 | static int hci_start_poll(struct nfc_dev *nfc_dev, |
497 | u32 im_protocols, u32 tm_protocols) | |
8b8d2e08 EL |
498 | { |
499 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
8b8d2e08 EL |
500 | |
501 | if (hdev->ops->start_poll) | |
fe7c5800 | 502 | return hdev->ops->start_poll(hdev, im_protocols, tm_protocols); |
8b8d2e08 | 503 | else |
03bed29e | 504 | return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, |
8b8d2e08 | 505 | NFC_HCI_EVT_READER_REQUESTED, NULL, 0); |
8b8d2e08 EL |
506 | } |
507 | ||
508 | static void hci_stop_poll(struct nfc_dev *nfc_dev) | |
509 | { | |
510 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
511 | ||
03bed29e EL |
512 | nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE, |
513 | NFC_HCI_EVT_END_OPERATION, NULL, 0); | |
8b8d2e08 EL |
514 | } |
515 | ||
90099433 EL |
516 | static int hci_activate_target(struct nfc_dev *nfc_dev, |
517 | struct nfc_target *target, u32 protocol) | |
8b8d2e08 | 518 | { |
8b8d2e08 EL |
519 | return 0; |
520 | } | |
521 | ||
90099433 EL |
522 | static void hci_deactivate_target(struct nfc_dev *nfc_dev, |
523 | struct nfc_target *target) | |
8b8d2e08 EL |
524 | { |
525 | } | |
526 | ||
be9ae4ce SO |
527 | static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target, |
528 | struct sk_buff *skb, data_exchange_cb_t cb, | |
529 | void *cb_context) | |
8b8d2e08 EL |
530 | { |
531 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
532 | int r; | |
8b8d2e08 EL |
533 | struct sk_buff *res_skb = NULL; |
534 | ||
90099433 | 535 | pr_debug("target_idx=%d\n", target->idx); |
8b8d2e08 EL |
536 | |
537 | switch (target->hci_reader_gate) { | |
538 | case NFC_HCI_RF_READER_A_GATE: | |
539 | case NFC_HCI_RF_READER_B_GATE: | |
540 | if (hdev->ops->data_exchange) { | |
541 | r = hdev->ops->data_exchange(hdev, target, skb, | |
542 | &res_skb); | |
543 | if (r <= 0) /* handled */ | |
544 | break; | |
545 | } | |
546 | ||
547 | *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */ | |
548 | r = nfc_hci_send_cmd(hdev, target->hci_reader_gate, | |
549 | NFC_HCI_WR_XCHG_DATA, | |
550 | skb->data, skb->len, &res_skb); | |
551 | /* | |
552 | * TODO: Check RF Error indicator to make sure data is valid. | |
553 | * It seems that HCI cmd can complete without error, but data | |
554 | * can be invalid if an RF error occured? Ignore for now. | |
555 | */ | |
556 | if (r == 0) | |
557 | skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */ | |
558 | break; | |
559 | default: | |
560 | if (hdev->ops->data_exchange) { | |
561 | r = hdev->ops->data_exchange(hdev, target, skb, | |
562 | &res_skb); | |
563 | if (r == 1) | |
564 | r = -ENOTSUPP; | |
565 | } | |
566 | else | |
567 | r = -ENOTSUPP; | |
568 | } | |
569 | ||
570 | kfree_skb(skb); | |
571 | ||
572 | cb(cb_context, res_skb, r); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
1676f751 EL |
577 | static int hci_check_presence(struct nfc_dev *nfc_dev, |
578 | struct nfc_target *target) | |
579 | { | |
580 | struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev); | |
581 | ||
582 | if (hdev->ops->check_presence) | |
583 | return hdev->ops->check_presence(hdev, target); | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
bd007bea | 588 | static struct nfc_ops hci_nfc_ops = { |
8b8d2e08 EL |
589 | .dev_up = hci_dev_up, |
590 | .dev_down = hci_dev_down, | |
591 | .start_poll = hci_start_poll, | |
592 | .stop_poll = hci_stop_poll, | |
593 | .activate_target = hci_activate_target, | |
594 | .deactivate_target = hci_deactivate_target, | |
be9ae4ce | 595 | .im_transceive = hci_transceive, |
1676f751 | 596 | .check_presence = hci_check_presence, |
8b8d2e08 EL |
597 | }; |
598 | ||
599 | struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops, | |
600 | struct nfc_hci_init_data *init_data, | |
601 | u32 protocols, | |
602 | int tx_headroom, | |
603 | int tx_tailroom, | |
604 | int max_link_payload) | |
605 | { | |
606 | struct nfc_hci_dev *hdev; | |
607 | ||
608 | if (ops->xmit == NULL) | |
609 | return NULL; | |
610 | ||
611 | if (protocols == 0) | |
612 | return NULL; | |
613 | ||
614 | hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL); | |
615 | if (hdev == NULL) | |
616 | return NULL; | |
617 | ||
618 | hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols, | |
619 | tx_headroom + HCI_CMDS_HEADROOM, | |
620 | tx_tailroom); | |
621 | if (!hdev->ndev) { | |
622 | kfree(hdev); | |
623 | return NULL; | |
624 | } | |
625 | ||
626 | hdev->ops = ops; | |
627 | hdev->max_data_link_payload = max_link_payload; | |
628 | hdev->init_data = *init_data; | |
629 | ||
630 | nfc_set_drvdata(hdev->ndev, hdev); | |
631 | ||
632 | memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); | |
633 | ||
634 | return hdev; | |
635 | } | |
636 | EXPORT_SYMBOL(nfc_hci_allocate_device); | |
637 | ||
638 | void nfc_hci_free_device(struct nfc_hci_dev *hdev) | |
639 | { | |
640 | nfc_free_device(hdev->ndev); | |
641 | kfree(hdev); | |
642 | } | |
643 | EXPORT_SYMBOL(nfc_hci_free_device); | |
644 | ||
645 | int nfc_hci_register_device(struct nfc_hci_dev *hdev) | |
646 | { | |
647 | struct device *dev = &hdev->ndev->dev; | |
648 | const char *devname = dev_name(dev); | |
649 | char name[32]; | |
650 | int r = 0; | |
651 | ||
652 | mutex_init(&hdev->msg_tx_mutex); | |
653 | ||
654 | INIT_LIST_HEAD(&hdev->msg_tx_queue); | |
655 | ||
656 | INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work); | |
657 | snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname); | |
658 | hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | | |
659 | WQ_MEM_RECLAIM, 1); | |
660 | if (hdev->msg_tx_wq == NULL) { | |
661 | r = -ENOMEM; | |
662 | goto exit; | |
663 | } | |
664 | ||
665 | init_timer(&hdev->cmd_timer); | |
666 | hdev->cmd_timer.data = (unsigned long)hdev; | |
667 | hdev->cmd_timer.function = nfc_hci_cmd_timeout; | |
668 | ||
669 | skb_queue_head_init(&hdev->rx_hcp_frags); | |
670 | ||
671 | INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work); | |
672 | snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname); | |
673 | hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND | | |
674 | WQ_MEM_RECLAIM, 1); | |
675 | if (hdev->msg_rx_wq == NULL) { | |
676 | r = -ENOMEM; | |
677 | goto exit; | |
678 | } | |
679 | ||
680 | skb_queue_head_init(&hdev->msg_rx_queue); | |
681 | ||
682 | r = nfc_register_device(hdev->ndev); | |
683 | ||
684 | exit: | |
685 | if (r < 0) { | |
686 | if (hdev->msg_tx_wq) | |
687 | destroy_workqueue(hdev->msg_tx_wq); | |
688 | if (hdev->msg_rx_wq) | |
689 | destroy_workqueue(hdev->msg_rx_wq); | |
690 | } | |
691 | ||
692 | return r; | |
693 | } | |
694 | EXPORT_SYMBOL(nfc_hci_register_device); | |
695 | ||
696 | void nfc_hci_unregister_device(struct nfc_hci_dev *hdev) | |
697 | { | |
698 | struct hci_msg *msg; | |
699 | ||
700 | skb_queue_purge(&hdev->rx_hcp_frags); | |
701 | skb_queue_purge(&hdev->msg_rx_queue); | |
702 | ||
703 | while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, | |
704 | msg_l)) != NULL) { | |
705 | list_del(&msg->msg_l); | |
706 | skb_queue_purge(&msg->msg_frags); | |
707 | kfree(msg); | |
708 | } | |
709 | ||
710 | del_timer_sync(&hdev->cmd_timer); | |
711 | ||
712 | nfc_unregister_device(hdev->ndev); | |
713 | ||
714 | destroy_workqueue(hdev->msg_tx_wq); | |
715 | ||
716 | destroy_workqueue(hdev->msg_rx_wq); | |
717 | } | |
718 | EXPORT_SYMBOL(nfc_hci_unregister_device); | |
719 | ||
720 | void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata) | |
721 | { | |
722 | hdev->clientdata = clientdata; | |
723 | } | |
724 | EXPORT_SYMBOL(nfc_hci_set_clientdata); | |
725 | ||
726 | void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev) | |
727 | { | |
728 | return hdev->clientdata; | |
729 | } | |
730 | EXPORT_SYMBOL(nfc_hci_get_clientdata); | |
731 | ||
72b06f75 | 732 | static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err) |
a9a741a7 | 733 | { |
a070c859 EL |
734 | mutex_lock(&hdev->msg_tx_mutex); |
735 | ||
736 | if (hdev->cmd_pending_msg == NULL) { | |
737 | nfc_driver_failure(hdev->ndev, err); | |
738 | goto exit; | |
739 | } | |
740 | ||
741 | __nfc_hci_cmd_completion(hdev, err, NULL); | |
742 | ||
743 | exit: | |
744 | mutex_unlock(&hdev->msg_tx_mutex); | |
a9a741a7 | 745 | } |
72b06f75 EL |
746 | |
747 | void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err) | |
748 | { | |
749 | nfc_hci_failure(hdev, err); | |
750 | } | |
a9a741a7 EL |
751 | EXPORT_SYMBOL(nfc_hci_driver_failure); |
752 | ||
8b8d2e08 EL |
753 | void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb) |
754 | { | |
755 | struct hcp_packet *packet; | |
756 | u8 type; | |
757 | u8 instruction; | |
758 | struct sk_buff *hcp_skb; | |
759 | u8 pipe; | |
760 | struct sk_buff *frag_skb; | |
761 | int msg_len; | |
762 | ||
8b8d2e08 EL |
763 | packet = (struct hcp_packet *)skb->data; |
764 | if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) { | |
765 | skb_queue_tail(&hdev->rx_hcp_frags, skb); | |
766 | return; | |
767 | } | |
768 | ||
769 | /* it's the last fragment. Does it need re-aggregation? */ | |
770 | if (skb_queue_len(&hdev->rx_hcp_frags)) { | |
771 | pipe = packet->header & NFC_HCI_FRAGMENT; | |
772 | skb_queue_tail(&hdev->rx_hcp_frags, skb); | |
773 | ||
774 | msg_len = 0; | |
775 | skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { | |
776 | msg_len += (frag_skb->len - | |
777 | NFC_HCI_HCP_PACKET_HEADER_LEN); | |
778 | } | |
779 | ||
780 | hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN + | |
781 | msg_len, GFP_KERNEL); | |
782 | if (hcp_skb == NULL) { | |
72b06f75 EL |
783 | nfc_hci_failure(hdev, -ENOMEM); |
784 | return; | |
8b8d2e08 EL |
785 | } |
786 | ||
787 | *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe; | |
788 | ||
789 | skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) { | |
790 | msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN; | |
791 | memcpy(skb_put(hcp_skb, msg_len), | |
792 | frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN, | |
793 | msg_len); | |
794 | } | |
795 | ||
796 | skb_queue_purge(&hdev->rx_hcp_frags); | |
797 | } else { | |
798 | packet->header &= NFC_HCI_FRAGMENT; | |
799 | hcp_skb = skb; | |
800 | } | |
801 | ||
802 | /* if this is a response, dispatch immediately to | |
803 | * unblock waiting cmd context. Otherwise, enqueue to dispatch | |
804 | * in separate context where handler can also execute command. | |
805 | */ | |
806 | packet = (struct hcp_packet *)hcp_skb->data; | |
807 | type = HCP_MSG_GET_TYPE(packet->message.header); | |
808 | if (type == NFC_HCI_HCP_RESPONSE) { | |
809 | pipe = packet->header; | |
810 | instruction = HCP_MSG_GET_CMD(packet->message.header); | |
811 | skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN + | |
812 | NFC_HCI_HCP_MESSAGE_HEADER_LEN); | |
813 | nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb); | |
814 | } else { | |
815 | skb_queue_tail(&hdev->msg_rx_queue, hcp_skb); | |
816 | queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work); | |
817 | } | |
818 | } | |
819 | EXPORT_SYMBOL(nfc_hci_recv_frame); | |
820 | ||
821 | MODULE_LICENSE("GPL"); |