1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * NFC Digital Protocol stack |
4 | * Copyright (c) 2013, Intel Corporation. |
5 | */ |
6 | |
7 | #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
8 | |
9 | #include <linux/module.h> |
10 | |
11 | #include "digital.h" |
12 | |
13 | #define DIGITAL_PROTO_NFCA_RF_TECH \ |
14 | (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \ |
15 | NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK) |
16 | |
17 | #define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK |
18 | |
19 | #define DIGITAL_PROTO_NFCF_RF_TECH \ |
20 | (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) |
21 | |
22 | #define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK |
23 | |
24 | /* Delay between each poll frame (ms) */ |
25 | #define DIGITAL_POLL_INTERVAL 10 |
26 | |
27 | struct digital_cmd { |
28 | struct list_head queue; |
29 | |
30 | u8 type; |
31 | u8 pending; |
32 | |
33 | u16 timeout; |
34 | struct sk_buff *req; |
35 | struct sk_buff *resp; |
36 | struct digital_tg_mdaa_params *mdaa_params; |
37 | |
38 | nfc_digital_cmd_complete_t cmd_cb; |
39 | void *cb_context; |
40 | }; |
41 | |
42 | struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, |
43 | unsigned int len) |
44 | { |
45 | struct sk_buff *skb; |
46 | |
47 | skb = alloc_skb(size: len + ddev->tx_headroom + ddev->tx_tailroom, |
48 | GFP_KERNEL); |
49 | if (skb) |
50 | skb_reserve(skb, len: ddev->tx_headroom); |
51 | |
52 | return skb; |
53 | } |
54 | |
55 | void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, |
56 | u8 bitwise_inv, u8 msb_first) |
57 | { |
58 | u16 crc; |
59 | |
60 | crc = crc_func(init, skb->data, skb->len); |
61 | |
62 | if (bitwise_inv) |
63 | crc = ~crc; |
64 | |
65 | if (msb_first) |
66 | crc = __fswab16(val: crc); |
67 | |
68 | skb_put_u8(skb, val: crc & 0xFF); |
69 | skb_put_u8(skb, val: (crc >> 8) & 0xFF); |
70 | } |
71 | |
72 | int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, |
73 | u16 crc_init, u8 bitwise_inv, u8 msb_first) |
74 | { |
75 | int rc; |
76 | u16 crc; |
77 | |
78 | if (skb->len <= 2) |
79 | return -EIO; |
80 | |
81 | crc = crc_func(crc_init, skb->data, skb->len - 2); |
82 | |
83 | if (bitwise_inv) |
84 | crc = ~crc; |
85 | |
86 | if (msb_first) |
87 | crc = __swab16(crc); |
88 | |
89 | rc = (skb->data[skb->len - 2] - (crc & 0xFF)) + |
90 | (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF)); |
91 | |
92 | if (rc) |
93 | return -EIO; |
94 | |
95 | skb_trim(skb, len: skb->len - 2); |
96 | |
97 | return 0; |
98 | } |
99 | |
100 | static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on) |
101 | { |
102 | ddev->ops->switch_rf(ddev, on); |
103 | } |
104 | |
105 | static inline void digital_abort_cmd(struct nfc_digital_dev *ddev) |
106 | { |
107 | ddev->ops->abort_cmd(ddev); |
108 | } |
109 | |
110 | static void digital_wq_cmd_complete(struct work_struct *work) |
111 | { |
112 | struct digital_cmd *cmd; |
113 | struct nfc_digital_dev *ddev = container_of(work, |
114 | struct nfc_digital_dev, |
115 | cmd_complete_work); |
116 | |
117 | mutex_lock(&ddev->cmd_lock); |
118 | |
119 | cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, |
120 | queue); |
121 | if (!cmd) { |
122 | mutex_unlock(lock: &ddev->cmd_lock); |
123 | return; |
124 | } |
125 | |
126 | list_del(entry: &cmd->queue); |
127 | |
128 | mutex_unlock(lock: &ddev->cmd_lock); |
129 | |
130 | if (!IS_ERR(ptr: cmd->resp)) |
131 | print_hex_dump_debug("DIGITAL RX: " , DUMP_PREFIX_NONE, 16, 1, |
132 | cmd->resp->data, cmd->resp->len, false); |
133 | |
134 | cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp); |
135 | |
136 | kfree(objp: cmd->mdaa_params); |
137 | kfree(objp: cmd); |
138 | |
139 | schedule_work(work: &ddev->cmd_work); |
140 | } |
141 | |
142 | static void digital_send_cmd_complete(struct nfc_digital_dev *ddev, |
143 | void *arg, struct sk_buff *resp) |
144 | { |
145 | struct digital_cmd *cmd = arg; |
146 | |
147 | cmd->resp = resp; |
148 | |
149 | schedule_work(work: &ddev->cmd_complete_work); |
150 | } |
151 | |
152 | static void digital_wq_cmd(struct work_struct *work) |
153 | { |
154 | int rc; |
155 | struct digital_cmd *cmd; |
156 | struct digital_tg_mdaa_params *params; |
157 | struct nfc_digital_dev *ddev = container_of(work, |
158 | struct nfc_digital_dev, |
159 | cmd_work); |
160 | |
161 | mutex_lock(&ddev->cmd_lock); |
162 | |
163 | cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, |
164 | queue); |
165 | if (!cmd || cmd->pending) { |
166 | mutex_unlock(lock: &ddev->cmd_lock); |
167 | return; |
168 | } |
169 | |
170 | cmd->pending = 1; |
171 | |
172 | mutex_unlock(lock: &ddev->cmd_lock); |
173 | |
174 | if (cmd->req) |
175 | print_hex_dump_debug("DIGITAL TX: " , DUMP_PREFIX_NONE, 16, 1, |
176 | cmd->req->data, cmd->req->len, false); |
177 | |
178 | switch (cmd->type) { |
179 | case DIGITAL_CMD_IN_SEND: |
180 | rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout, |
181 | digital_send_cmd_complete, cmd); |
182 | break; |
183 | |
184 | case DIGITAL_CMD_TG_SEND: |
185 | rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout, |
186 | digital_send_cmd_complete, cmd); |
187 | break; |
188 | |
189 | case DIGITAL_CMD_TG_LISTEN: |
190 | rc = ddev->ops->tg_listen(ddev, cmd->timeout, |
191 | digital_send_cmd_complete, cmd); |
192 | break; |
193 | |
194 | case DIGITAL_CMD_TG_LISTEN_MDAA: |
195 | params = cmd->mdaa_params; |
196 | |
197 | rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout, |
198 | digital_send_cmd_complete, cmd); |
199 | break; |
200 | |
201 | case DIGITAL_CMD_TG_LISTEN_MD: |
202 | rc = ddev->ops->tg_listen_md(ddev, cmd->timeout, |
203 | digital_send_cmd_complete, cmd); |
204 | break; |
205 | |
206 | default: |
207 | pr_err("Unknown cmd type %d\n" , cmd->type); |
208 | return; |
209 | } |
210 | |
211 | if (!rc) |
212 | return; |
213 | |
214 | pr_err("in_send_command returned err %d\n" , rc); |
215 | |
216 | mutex_lock(&ddev->cmd_lock); |
217 | list_del(entry: &cmd->queue); |
218 | mutex_unlock(lock: &ddev->cmd_lock); |
219 | |
220 | kfree_skb(skb: cmd->req); |
221 | kfree(objp: cmd->mdaa_params); |
222 | kfree(objp: cmd); |
223 | |
224 | schedule_work(work: &ddev->cmd_work); |
225 | } |
226 | |
227 | int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, |
228 | struct sk_buff *skb, struct digital_tg_mdaa_params *params, |
229 | u16 timeout, nfc_digital_cmd_complete_t cmd_cb, |
230 | void *cb_context) |
231 | { |
232 | struct digital_cmd *cmd; |
233 | |
234 | cmd = kzalloc(size: sizeof(*cmd), GFP_KERNEL); |
235 | if (!cmd) |
236 | return -ENOMEM; |
237 | |
238 | cmd->type = cmd_type; |
239 | cmd->timeout = timeout; |
240 | cmd->req = skb; |
241 | cmd->mdaa_params = params; |
242 | cmd->cmd_cb = cmd_cb; |
243 | cmd->cb_context = cb_context; |
244 | INIT_LIST_HEAD(list: &cmd->queue); |
245 | |
246 | mutex_lock(&ddev->cmd_lock); |
247 | list_add_tail(new: &cmd->queue, head: &ddev->cmd_queue); |
248 | mutex_unlock(lock: &ddev->cmd_lock); |
249 | |
250 | schedule_work(work: &ddev->cmd_work); |
251 | |
252 | return 0; |
253 | } |
254 | |
255 | int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param) |
256 | { |
257 | int rc; |
258 | |
259 | rc = ddev->ops->in_configure_hw(ddev, type, param); |
260 | if (rc) |
261 | pr_err("in_configure_hw failed: %d\n" , rc); |
262 | |
263 | return rc; |
264 | } |
265 | |
266 | int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param) |
267 | { |
268 | int rc; |
269 | |
270 | rc = ddev->ops->tg_configure_hw(ddev, type, param); |
271 | if (rc) |
272 | pr_err("tg_configure_hw failed: %d\n" , rc); |
273 | |
274 | return rc; |
275 | } |
276 | |
277 | static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech) |
278 | { |
279 | struct digital_tg_mdaa_params *params; |
280 | int rc; |
281 | |
282 | params = kzalloc(size: sizeof(*params), GFP_KERNEL); |
283 | if (!params) |
284 | return -ENOMEM; |
285 | |
286 | params->sens_res = DIGITAL_SENS_RES_NFC_DEP; |
287 | get_random_bytes(buf: params->nfcid1, len: sizeof(params->nfcid1)); |
288 | params->sel_res = DIGITAL_SEL_RES_NFC_DEP; |
289 | |
290 | params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1; |
291 | params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2; |
292 | get_random_bytes(buf: params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); |
293 | params->sc = DIGITAL_SENSF_FELICA_SC; |
294 | |
295 | rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, |
296 | timeout: 500, cmd_cb: digital_tg_recv_atr_req, NULL); |
297 | if (rc) |
298 | kfree(objp: params); |
299 | |
300 | return rc; |
301 | } |
302 | |
303 | static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech) |
304 | { |
305 | return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, timeout: 500, |
306 | cmd_cb: digital_tg_recv_md_req, NULL); |
307 | } |
308 | |
309 | int digital_target_found(struct nfc_digital_dev *ddev, |
310 | struct nfc_target *target, u8 protocol) |
311 | { |
312 | int rc; |
313 | u8 framing; |
314 | u8 rf_tech; |
315 | u8 poll_tech_count; |
316 | int (*check_crc)(struct sk_buff *skb); |
317 | void (*add_crc)(struct sk_buff *skb); |
318 | |
319 | rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; |
320 | |
321 | switch (protocol) { |
322 | case NFC_PROTO_JEWEL: |
323 | framing = NFC_DIGITAL_FRAMING_NFCA_T1T; |
324 | check_crc = digital_skb_check_crc_b; |
325 | add_crc = digital_skb_add_crc_b; |
326 | break; |
327 | |
328 | case NFC_PROTO_MIFARE: |
329 | framing = NFC_DIGITAL_FRAMING_NFCA_T2T; |
330 | check_crc = digital_skb_check_crc_a; |
331 | add_crc = digital_skb_add_crc_a; |
332 | break; |
333 | |
334 | case NFC_PROTO_FELICA: |
335 | framing = NFC_DIGITAL_FRAMING_NFCF_T3T; |
336 | check_crc = digital_skb_check_crc_f; |
337 | add_crc = digital_skb_add_crc_f; |
338 | break; |
339 | |
340 | case NFC_PROTO_NFC_DEP: |
341 | if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { |
342 | framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; |
343 | check_crc = digital_skb_check_crc_a; |
344 | add_crc = digital_skb_add_crc_a; |
345 | } else { |
346 | framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; |
347 | check_crc = digital_skb_check_crc_f; |
348 | add_crc = digital_skb_add_crc_f; |
349 | } |
350 | break; |
351 | |
352 | case NFC_PROTO_ISO15693: |
353 | framing = NFC_DIGITAL_FRAMING_ISO15693_T5T; |
354 | check_crc = digital_skb_check_crc_b; |
355 | add_crc = digital_skb_add_crc_b; |
356 | break; |
357 | |
358 | case NFC_PROTO_ISO14443: |
359 | framing = NFC_DIGITAL_FRAMING_NFCA_T4T; |
360 | check_crc = digital_skb_check_crc_a; |
361 | add_crc = digital_skb_add_crc_a; |
362 | break; |
363 | |
364 | case NFC_PROTO_ISO14443_B: |
365 | framing = NFC_DIGITAL_FRAMING_NFCB_T4T; |
366 | check_crc = digital_skb_check_crc_b; |
367 | add_crc = digital_skb_add_crc_b; |
368 | break; |
369 | |
370 | default: |
371 | pr_err("Invalid protocol %d\n" , protocol); |
372 | return -EINVAL; |
373 | } |
374 | |
375 | pr_debug("rf_tech=%d, protocol=%d\n" , rf_tech, protocol); |
376 | |
377 | ddev->curr_rf_tech = rf_tech; |
378 | |
379 | if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { |
380 | ddev->skb_add_crc = digital_skb_add_crc_none; |
381 | ddev->skb_check_crc = digital_skb_check_crc_none; |
382 | } else { |
383 | ddev->skb_add_crc = add_crc; |
384 | ddev->skb_check_crc = check_crc; |
385 | } |
386 | |
387 | rc = digital_in_configure_hw(ddev, type: NFC_DIGITAL_CONFIG_FRAMING, param: framing); |
388 | if (rc) |
389 | return rc; |
390 | |
391 | target->supported_protocols = (1 << protocol); |
392 | |
393 | poll_tech_count = ddev->poll_tech_count; |
394 | ddev->poll_tech_count = 0; |
395 | |
396 | rc = nfc_targets_found(dev: ddev->nfc_dev, targets: target, ntargets: 1); |
397 | if (rc) { |
398 | ddev->poll_tech_count = poll_tech_count; |
399 | return rc; |
400 | } |
401 | |
402 | return 0; |
403 | } |
404 | |
405 | void digital_poll_next_tech(struct nfc_digital_dev *ddev) |
406 | { |
407 | u8 rand_mod; |
408 | |
409 | digital_switch_rf(ddev, on: 0); |
410 | |
411 | mutex_lock(&ddev->poll_lock); |
412 | |
413 | if (!ddev->poll_tech_count) { |
414 | mutex_unlock(lock: &ddev->poll_lock); |
415 | return; |
416 | } |
417 | |
418 | get_random_bytes(buf: &rand_mod, len: sizeof(rand_mod)); |
419 | ddev->poll_tech_index = rand_mod % ddev->poll_tech_count; |
420 | |
421 | mutex_unlock(lock: &ddev->poll_lock); |
422 | |
423 | schedule_delayed_work(dwork: &ddev->poll_work, |
424 | delay: msecs_to_jiffies(DIGITAL_POLL_INTERVAL)); |
425 | } |
426 | |
427 | static void digital_wq_poll(struct work_struct *work) |
428 | { |
429 | int rc; |
430 | struct digital_poll_tech *poll_tech; |
431 | struct nfc_digital_dev *ddev = container_of(work, |
432 | struct nfc_digital_dev, |
433 | poll_work.work); |
434 | mutex_lock(&ddev->poll_lock); |
435 | |
436 | if (!ddev->poll_tech_count) { |
437 | mutex_unlock(lock: &ddev->poll_lock); |
438 | return; |
439 | } |
440 | |
441 | poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; |
442 | |
443 | mutex_unlock(lock: &ddev->poll_lock); |
444 | |
445 | rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); |
446 | if (rc) |
447 | digital_poll_next_tech(ddev); |
448 | } |
449 | |
450 | static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, |
451 | digital_poll_t poll_func) |
452 | { |
453 | struct digital_poll_tech *poll_tech; |
454 | |
455 | if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) |
456 | return; |
457 | |
458 | poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; |
459 | |
460 | poll_tech->rf_tech = rf_tech; |
461 | poll_tech->poll_func = poll_func; |
462 | } |
463 | |
464 | /** |
465 | * digital_start_poll - start_poll operation |
466 | * @nfc_dev: device to be polled |
467 | * @im_protocols: bitset of nfc initiator protocols to be used for polling |
468 | * @tm_protocols: bitset of nfc transport protocols to be used for polling |
469 | * |
470 | * For every supported protocol, the corresponding polling function is added |
471 | * to the table of polling technologies (ddev->poll_techs[]) using |
472 | * digital_add_poll_tech(). |
473 | * When a polling function fails (by timeout or protocol error) the next one is |
474 | * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). |
475 | */ |
476 | static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, |
477 | __u32 tm_protocols) |
478 | { |
479 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
480 | u32 matching_im_protocols, matching_tm_protocols; |
481 | |
482 | pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n" , im_protocols, |
483 | tm_protocols, ddev->protocols); |
484 | |
485 | matching_im_protocols = ddev->protocols & im_protocols; |
486 | matching_tm_protocols = ddev->protocols & tm_protocols; |
487 | |
488 | if (!matching_im_protocols && !matching_tm_protocols) { |
489 | pr_err("Unknown protocol\n" ); |
490 | return -EINVAL; |
491 | } |
492 | |
493 | if (ddev->poll_tech_count) { |
494 | pr_err("Already polling\n" ); |
495 | return -EBUSY; |
496 | } |
497 | |
498 | if (ddev->curr_protocol) { |
499 | pr_err("A target is already active\n" ); |
500 | return -EBUSY; |
501 | } |
502 | |
503 | ddev->poll_tech_count = 0; |
504 | ddev->poll_tech_index = 0; |
505 | |
506 | if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) |
507 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_106A, |
508 | poll_func: digital_in_send_sens_req); |
509 | |
510 | if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH) |
511 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_106B, |
512 | poll_func: digital_in_send_sensb_req); |
513 | |
514 | if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { |
515 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_212F, |
516 | poll_func: digital_in_send_sensf_req); |
517 | |
518 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_424F, |
519 | poll_func: digital_in_send_sensf_req); |
520 | } |
521 | |
522 | if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH) |
523 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_ISO15693, |
524 | poll_func: digital_in_send_iso15693_inv_req); |
525 | |
526 | if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) { |
527 | if (ddev->ops->tg_listen_mdaa) { |
528 | digital_add_poll_tech(ddev, rf_tech: 0, |
529 | poll_func: digital_tg_listen_mdaa); |
530 | } else if (ddev->ops->tg_listen_md) { |
531 | digital_add_poll_tech(ddev, rf_tech: 0, |
532 | poll_func: digital_tg_listen_md); |
533 | } else { |
534 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_106A, |
535 | poll_func: digital_tg_listen_nfca); |
536 | |
537 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_212F, |
538 | poll_func: digital_tg_listen_nfcf); |
539 | |
540 | digital_add_poll_tech(ddev, rf_tech: NFC_DIGITAL_RF_TECH_424F, |
541 | poll_func: digital_tg_listen_nfcf); |
542 | } |
543 | } |
544 | |
545 | if (!ddev->poll_tech_count) { |
546 | pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n" , |
547 | matching_im_protocols, matching_tm_protocols); |
548 | return -EINVAL; |
549 | } |
550 | |
551 | schedule_delayed_work(dwork: &ddev->poll_work, delay: 0); |
552 | |
553 | return 0; |
554 | } |
555 | |
556 | static void digital_stop_poll(struct nfc_dev *nfc_dev) |
557 | { |
558 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
559 | |
560 | mutex_lock(&ddev->poll_lock); |
561 | |
562 | if (!ddev->poll_tech_count) { |
563 | pr_err("Polling operation was not running\n" ); |
564 | mutex_unlock(lock: &ddev->poll_lock); |
565 | return; |
566 | } |
567 | |
568 | ddev->poll_tech_count = 0; |
569 | |
570 | mutex_unlock(lock: &ddev->poll_lock); |
571 | |
572 | cancel_delayed_work_sync(dwork: &ddev->poll_work); |
573 | |
574 | digital_abort_cmd(ddev); |
575 | } |
576 | |
577 | static int digital_dev_up(struct nfc_dev *nfc_dev) |
578 | { |
579 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
580 | |
581 | digital_switch_rf(ddev, on: 1); |
582 | |
583 | return 0; |
584 | } |
585 | |
586 | static int digital_dev_down(struct nfc_dev *nfc_dev) |
587 | { |
588 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
589 | |
590 | digital_switch_rf(ddev, on: 0); |
591 | |
592 | return 0; |
593 | } |
594 | |
595 | static int digital_dep_link_up(struct nfc_dev *nfc_dev, |
596 | struct nfc_target *target, |
597 | __u8 comm_mode, __u8 *gb, size_t gb_len) |
598 | { |
599 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
600 | int rc; |
601 | |
602 | rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); |
603 | |
604 | if (!rc) |
605 | ddev->curr_protocol = NFC_PROTO_NFC_DEP; |
606 | |
607 | return rc; |
608 | } |
609 | |
610 | static int digital_dep_link_down(struct nfc_dev *nfc_dev) |
611 | { |
612 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
613 | |
614 | digital_abort_cmd(ddev); |
615 | |
616 | ddev->curr_protocol = 0; |
617 | |
618 | return 0; |
619 | } |
620 | |
621 | static int digital_activate_target(struct nfc_dev *nfc_dev, |
622 | struct nfc_target *target, __u32 protocol) |
623 | { |
624 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
625 | |
626 | if (ddev->poll_tech_count) { |
627 | pr_err("Can't activate a target while polling\n" ); |
628 | return -EBUSY; |
629 | } |
630 | |
631 | if (ddev->curr_protocol) { |
632 | pr_err("A target is already active\n" ); |
633 | return -EBUSY; |
634 | } |
635 | |
636 | ddev->curr_protocol = protocol; |
637 | |
638 | return 0; |
639 | } |
640 | |
641 | static void digital_deactivate_target(struct nfc_dev *nfc_dev, |
642 | struct nfc_target *target, |
643 | u8 mode) |
644 | { |
645 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
646 | |
647 | if (!ddev->curr_protocol) { |
648 | pr_err("No active target\n" ); |
649 | return; |
650 | } |
651 | |
652 | digital_abort_cmd(ddev); |
653 | ddev->curr_protocol = 0; |
654 | } |
655 | |
656 | static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) |
657 | { |
658 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); |
659 | |
660 | return digital_tg_send_dep_res(ddev, skb); |
661 | } |
662 | |
663 | static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, |
664 | struct sk_buff *resp) |
665 | { |
666 | struct digital_data_exch *data_exch = arg; |
667 | int rc; |
668 | |
669 | if (IS_ERR(ptr: resp)) { |
670 | rc = PTR_ERR(ptr: resp); |
671 | resp = NULL; |
672 | goto done; |
673 | } |
674 | |
675 | if (ddev->curr_protocol == NFC_PROTO_MIFARE) { |
676 | rc = digital_in_recv_mifare_res(resp); |
677 | /* crc check is done in digital_in_recv_mifare_res() */ |
678 | goto done; |
679 | } |
680 | |
681 | if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || |
682 | (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { |
683 | rc = digital_in_iso_dep_pull_sod(ddev, skb: resp); |
684 | if (rc) |
685 | goto done; |
686 | } |
687 | |
688 | rc = ddev->skb_check_crc(resp); |
689 | |
690 | done: |
691 | if (rc) { |
692 | kfree_skb(skb: resp); |
693 | resp = NULL; |
694 | } |
695 | |
696 | data_exch->cb(data_exch->cb_context, resp, rc); |
697 | |
698 | kfree(objp: data_exch); |
699 | } |
700 | |
701 | static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, |
702 | struct sk_buff *skb, data_exchange_cb_t cb, |
703 | void *cb_context) |
704 | { |
705 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev: nfc_dev); |
706 | struct digital_data_exch *data_exch; |
707 | int rc; |
708 | |
709 | data_exch = kzalloc(size: sizeof(*data_exch), GFP_KERNEL); |
710 | if (!data_exch) |
711 | return -ENOMEM; |
712 | |
713 | data_exch->cb = cb; |
714 | data_exch->cb_context = cb_context; |
715 | |
716 | if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) { |
717 | rc = digital_in_send_dep_req(ddev, target, skb, data_exch); |
718 | goto exit; |
719 | } |
720 | |
721 | if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || |
722 | (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { |
723 | rc = digital_in_iso_dep_push_sod(ddev, skb); |
724 | if (rc) |
725 | goto exit; |
726 | } |
727 | |
728 | ddev->skb_add_crc(skb); |
729 | |
730 | rc = digital_in_send_cmd(ddev, skb, timeout: 500, cmd_cb: digital_in_send_complete, |
731 | cb_context: data_exch); |
732 | |
733 | exit: |
734 | if (rc) |
735 | kfree(objp: data_exch); |
736 | |
737 | return rc; |
738 | } |
739 | |
740 | static const struct nfc_ops digital_nfc_ops = { |
741 | .dev_up = digital_dev_up, |
742 | .dev_down = digital_dev_down, |
743 | .start_poll = digital_start_poll, |
744 | .stop_poll = digital_stop_poll, |
745 | .dep_link_up = digital_dep_link_up, |
746 | .dep_link_down = digital_dep_link_down, |
747 | .activate_target = digital_activate_target, |
748 | .deactivate_target = digital_deactivate_target, |
749 | .tm_send = digital_tg_send, |
750 | .im_transceive = digital_in_send, |
751 | }; |
752 | |
753 | struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops, |
754 | __u32 supported_protocols, |
755 | __u32 driver_capabilities, |
756 | int tx_headroom, int tx_tailroom) |
757 | { |
758 | struct nfc_digital_dev *ddev; |
759 | |
760 | if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || |
761 | !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || |
762 | !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) |
763 | return NULL; |
764 | |
765 | ddev = kzalloc(size: sizeof(*ddev), GFP_KERNEL); |
766 | if (!ddev) |
767 | return NULL; |
768 | |
769 | ddev->driver_capabilities = driver_capabilities; |
770 | ddev->ops = ops; |
771 | |
772 | mutex_init(&ddev->cmd_lock); |
773 | INIT_LIST_HEAD(list: &ddev->cmd_queue); |
774 | |
775 | INIT_WORK(&ddev->cmd_work, digital_wq_cmd); |
776 | INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); |
777 | |
778 | mutex_init(&ddev->poll_lock); |
779 | INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll); |
780 | |
781 | if (supported_protocols & NFC_PROTO_JEWEL_MASK) |
782 | ddev->protocols |= NFC_PROTO_JEWEL_MASK; |
783 | if (supported_protocols & NFC_PROTO_MIFARE_MASK) |
784 | ddev->protocols |= NFC_PROTO_MIFARE_MASK; |
785 | if (supported_protocols & NFC_PROTO_FELICA_MASK) |
786 | ddev->protocols |= NFC_PROTO_FELICA_MASK; |
787 | if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) |
788 | ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; |
789 | if (supported_protocols & NFC_PROTO_ISO15693_MASK) |
790 | ddev->protocols |= NFC_PROTO_ISO15693_MASK; |
791 | if (supported_protocols & NFC_PROTO_ISO14443_MASK) |
792 | ddev->protocols |= NFC_PROTO_ISO14443_MASK; |
793 | if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) |
794 | ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; |
795 | |
796 | ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; |
797 | ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; |
798 | |
799 | ddev->nfc_dev = nfc_allocate_device(ops: &digital_nfc_ops, supported_protocols: ddev->protocols, |
800 | tx_headroom: ddev->tx_headroom, |
801 | tx_tailroom: ddev->tx_tailroom); |
802 | if (!ddev->nfc_dev) { |
803 | pr_err("nfc_allocate_device failed\n" ); |
804 | goto free_dev; |
805 | } |
806 | |
807 | nfc_set_drvdata(dev: ddev->nfc_dev, data: ddev); |
808 | |
809 | return ddev; |
810 | |
811 | free_dev: |
812 | kfree(objp: ddev); |
813 | |
814 | return NULL; |
815 | } |
816 | EXPORT_SYMBOL(nfc_digital_allocate_device); |
817 | |
818 | void nfc_digital_free_device(struct nfc_digital_dev *ddev) |
819 | { |
820 | nfc_free_device(dev: ddev->nfc_dev); |
821 | kfree(objp: ddev); |
822 | } |
823 | EXPORT_SYMBOL(nfc_digital_free_device); |
824 | |
825 | int nfc_digital_register_device(struct nfc_digital_dev *ddev) |
826 | { |
827 | return nfc_register_device(dev: ddev->nfc_dev); |
828 | } |
829 | EXPORT_SYMBOL(nfc_digital_register_device); |
830 | |
831 | void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) |
832 | { |
833 | struct digital_cmd *cmd, *n; |
834 | |
835 | nfc_unregister_device(dev: ddev->nfc_dev); |
836 | |
837 | mutex_lock(&ddev->poll_lock); |
838 | ddev->poll_tech_count = 0; |
839 | mutex_unlock(lock: &ddev->poll_lock); |
840 | |
841 | cancel_delayed_work_sync(dwork: &ddev->poll_work); |
842 | cancel_work_sync(work: &ddev->cmd_work); |
843 | cancel_work_sync(work: &ddev->cmd_complete_work); |
844 | |
845 | list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { |
846 | list_del(entry: &cmd->queue); |
847 | |
848 | /* Call the command callback if any and pass it a ENODEV error. |
849 | * This gives a chance to the command issuer to free any |
850 | * allocated buffer. |
851 | */ |
852 | if (cmd->cmd_cb) |
853 | cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(error: -ENODEV)); |
854 | |
855 | kfree(objp: cmd->mdaa_params); |
856 | kfree(objp: cmd); |
857 | } |
858 | } |
859 | EXPORT_SYMBOL(nfc_digital_unregister_device); |
860 | |
861 | MODULE_DESCRIPTION("NFC Digital protocol stack" ); |
862 | MODULE_LICENSE("GPL" ); |
863 | |