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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4b10884e TE |
2 | /* |
3 | * NFC Digital Protocol stack | |
4 | * Copyright (c) 2013, Intel Corporation. | |
4b10884e TE |
5 | */ |
6 | ||
c5da0e4a SO |
7 | #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
8 | ||
4b10884e TE |
9 | #include <linux/module.h> |
10 | ||
11 | #include "digital.h" | |
12 | ||
59ee2361 | 13 | #define DIGITAL_PROTO_NFCA_RF_TECH \ |
ce2e56cd SS |
14 | (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \ |
15 | NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK) | |
59ee2361 | 16 | |
24734607 MG |
17 | #define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK |
18 | ||
7d0911c0 TE |
19 | #define DIGITAL_PROTO_NFCF_RF_TECH \ |
20 | (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) | |
8c0695e4 | 21 | |
a381d482 MG |
22 | #define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK |
23 | ||
7854a445 TE |
24 | /* Delay between each poll frame (ms) */ |
25 | #define DIGITAL_POLL_INTERVAL 10 | |
26 | ||
59ee2361 TE |
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; | |
1c7a4c24 | 36 | struct digital_tg_mdaa_params *mdaa_params; |
59ee2361 TE |
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(len + ddev->tx_headroom + ddev->tx_tailroom, | |
48 | GFP_KERNEL); | |
49 | if (skb) | |
50 | skb_reserve(skb, ddev->tx_headroom); | |
51 | ||
52 | return skb; | |
53 | } | |
54 | ||
2c66daec TE |
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(crc); | |
67 | ||
634fef61 JB |
68 | skb_put_u8(skb, crc & 0xFF); |
69 | skb_put_u8(skb, (crc >> 8) & 0xFF); | |
2c66daec TE |
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, skb->len - 2); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
59ee2361 TE |
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(&ddev->cmd_lock); | |
123 | return; | |
124 | } | |
125 | ||
126 | list_del(&cmd->queue); | |
127 | ||
128 | mutex_unlock(&ddev->cmd_lock); | |
129 | ||
130 | if (!IS_ERR(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 | ||
1c7a4c24 | 136 | kfree(cmd->mdaa_params); |
59ee2361 TE |
137 | kfree(cmd); |
138 | ||
139 | schedule_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(&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; | |
1c7a4c24 | 156 | struct digital_tg_mdaa_params *params; |
59ee2361 TE |
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(&ddev->cmd_lock); | |
167 | return; | |
168 | } | |
169 | ||
af66df0f TE |
170 | cmd->pending = 1; |
171 | ||
59ee2361 TE |
172 | mutex_unlock(&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; | |
1c7a4c24 TE |
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 | ||
bf30a67c MG |
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 | ||
59ee2361 | 206 | default: |
26042530 | 207 | pr_err("Unknown cmd type %d\n", cmd->type); |
59ee2361 TE |
208 | return; |
209 | } | |
210 | ||
211 | if (!rc) | |
212 | return; | |
213 | ||
26042530 | 214 | pr_err("in_send_command returned err %d\n", rc); |
59ee2361 TE |
215 | |
216 | mutex_lock(&ddev->cmd_lock); | |
217 | list_del(&cmd->queue); | |
218 | mutex_unlock(&ddev->cmd_lock); | |
219 | ||
220 | kfree_skb(cmd->req); | |
1c7a4c24 | 221 | kfree(cmd->mdaa_params); |
59ee2361 TE |
222 | kfree(cmd); |
223 | ||
224 | schedule_work(&ddev->cmd_work); | |
225 | } | |
226 | ||
227 | int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, | |
1c7a4c24 TE |
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) | |
59ee2361 TE |
231 | { |
232 | struct digital_cmd *cmd; | |
233 | ||
ae72c991 | 234 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); |
59ee2361 TE |
235 | if (!cmd) |
236 | return -ENOMEM; | |
237 | ||
238 | cmd->type = cmd_type; | |
239 | cmd->timeout = timeout; | |
240 | cmd->req = skb; | |
1c7a4c24 | 241 | cmd->mdaa_params = params; |
59ee2361 TE |
242 | cmd->cmd_cb = cmd_cb; |
243 | cmd->cb_context = cb_context; | |
244 | INIT_LIST_HEAD(&cmd->queue); | |
245 | ||
246 | mutex_lock(&ddev->cmd_lock); | |
247 | list_add_tail(&cmd->queue, &ddev->cmd_queue); | |
248 | mutex_unlock(&ddev->cmd_lock); | |
249 | ||
250 | schedule_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) | |
26042530 | 261 | pr_err("in_configure_hw failed: %d\n", rc); |
59ee2361 TE |
262 | |
263 | return rc; | |
264 | } | |
265 | ||
1c7a4c24 TE |
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) | |
26042530 | 272 | pr_err("tg_configure_hw failed: %d\n", rc); |
1c7a4c24 TE |
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; | |
58e7dcc9 | 280 | int rc; |
1c7a4c24 | 281 | |
ae72c991 | 282 | params = kzalloc(sizeof(*params), GFP_KERNEL); |
1c7a4c24 TE |
283 | if (!params) |
284 | return -ENOMEM; | |
285 | ||
286 | params->sens_res = DIGITAL_SENS_RES_NFC_DEP; | |
287 | get_random_bytes(params->nfcid1, 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(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2); | |
293 | params->sc = DIGITAL_SENSF_FELICA_SC; | |
294 | ||
58e7dcc9 ZX |
295 | rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params, |
296 | 500, digital_tg_recv_atr_req, NULL); | |
297 | if (rc) | |
298 | kfree(params); | |
299 | ||
300 | return rc; | |
1c7a4c24 TE |
301 | } |
302 | ||
bf30a67c MG |
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, 500, | |
306 | digital_tg_recv_md_req, NULL); | |
307 | } | |
308 | ||
2c66daec TE |
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; | |
0529a7ad | 315 | u8 poll_tech_count; |
2c66daec TE |
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 | ||
8c0695e4 TE |
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 | ||
7d0911c0 TE |
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 | ||
a381d482 | 352 | case NFC_PROTO_ISO15693: |
ceeee42d | 353 | framing = NFC_DIGITAL_FRAMING_ISO15693_T5T; |
a381d482 MG |
354 | check_crc = digital_skb_check_crc_b; |
355 | add_crc = digital_skb_add_crc_b; | |
564af14e | 356 | break; |
12e3d241 TE |
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; | |
a381d482 MG |
362 | break; |
363 | ||
24734607 MG |
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 | ||
2c66daec | 370 | default: |
26042530 | 371 | pr_err("Invalid protocol %d\n", protocol); |
2c66daec TE |
372 | return -EINVAL; |
373 | } | |
374 | ||
26042530 | 375 | pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol); |
2c66daec TE |
376 | |
377 | ddev->curr_rf_tech = rf_tech; | |
2c66daec TE |
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, NFC_DIGITAL_CONFIG_FRAMING, framing); | |
388 | if (rc) | |
389 | return rc; | |
390 | ||
391 | target->supported_protocols = (1 << protocol); | |
2c66daec | 392 | |
0529a7ad | 393 | poll_tech_count = ddev->poll_tech_count; |
2c66daec TE |
394 | ddev->poll_tech_count = 0; |
395 | ||
0529a7ad MG |
396 | rc = nfc_targets_found(ddev->nfc_dev, target, 1); |
397 | if (rc) { | |
398 | ddev->poll_tech_count = poll_tech_count; | |
399 | return rc; | |
400 | } | |
401 | ||
2c66daec TE |
402 | return 0; |
403 | } | |
404 | ||
59ee2361 TE |
405 | void digital_poll_next_tech(struct nfc_digital_dev *ddev) |
406 | { | |
9dc33705 TE |
407 | u8 rand_mod; |
408 | ||
59ee2361 TE |
409 | digital_switch_rf(ddev, 0); |
410 | ||
411 | mutex_lock(&ddev->poll_lock); | |
412 | ||
413 | if (!ddev->poll_tech_count) { | |
414 | mutex_unlock(&ddev->poll_lock); | |
415 | return; | |
416 | } | |
417 | ||
9dc33705 TE |
418 | get_random_bytes(&rand_mod, sizeof(rand_mod)); |
419 | ddev->poll_tech_index = rand_mod % ddev->poll_tech_count; | |
59ee2361 TE |
420 | |
421 | mutex_unlock(&ddev->poll_lock); | |
422 | ||
7854a445 TE |
423 | schedule_delayed_work(&ddev->poll_work, |
424 | msecs_to_jiffies(DIGITAL_POLL_INTERVAL)); | |
59ee2361 TE |
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, | |
7854a445 | 433 | poll_work.work); |
59ee2361 TE |
434 | mutex_lock(&ddev->poll_lock); |
435 | ||
436 | if (!ddev->poll_tech_count) { | |
437 | mutex_unlock(&ddev->poll_lock); | |
438 | return; | |
439 | } | |
440 | ||
441 | poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; | |
442 | ||
443 | mutex_unlock(&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 | /** | |
b6908cf7 | 465 | * digital_start_poll - start_poll operation |
7cdda1c1 AL |
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 | |
59ee2361 TE |
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 | */ | |
4b10884e TE |
476 | static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, |
477 | __u32 tm_protocols) | |
478 | { | |
59ee2361 TE |
479 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
480 | u32 matching_im_protocols, matching_tm_protocols; | |
481 | ||
26042530 | 482 | pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols, |
c5da0e4a | 483 | tm_protocols, ddev->protocols); |
59ee2361 TE |
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) { | |
26042530 | 489 | pr_err("Unknown protocol\n"); |
59ee2361 TE |
490 | return -EINVAL; |
491 | } | |
492 | ||
493 | if (ddev->poll_tech_count) { | |
26042530 | 494 | pr_err("Already polling\n"); |
59ee2361 TE |
495 | return -EBUSY; |
496 | } | |
497 | ||
498 | if (ddev->curr_protocol) { | |
26042530 | 499 | pr_err("A target is already active\n"); |
59ee2361 TE |
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, NFC_DIGITAL_RF_TECH_106A, | |
508 | digital_in_send_sens_req); | |
509 | ||
24734607 MG |
510 | if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH) |
511 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B, | |
512 | digital_in_send_sensb_req); | |
513 | ||
4f913d46 | 514 | if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { |
8c0695e4 TE |
515 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, |
516 | digital_in_send_sensf_req); | |
517 | ||
518 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, | |
519 | digital_in_send_sensf_req); | |
520 | } | |
521 | ||
a381d482 MG |
522 | if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH) |
523 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693, | |
524 | digital_in_send_iso15693_inv_req); | |
525 | ||
4f913d46 | 526 | if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) { |
1c7a4c24 TE |
527 | if (ddev->ops->tg_listen_mdaa) { |
528 | digital_add_poll_tech(ddev, 0, | |
529 | digital_tg_listen_mdaa); | |
bf30a67c MG |
530 | } else if (ddev->ops->tg_listen_md) { |
531 | digital_add_poll_tech(ddev, 0, | |
532 | digital_tg_listen_md); | |
1c7a4c24 TE |
533 | } else { |
534 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, | |
535 | digital_tg_listen_nfca); | |
536 | ||
537 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, | |
538 | digital_tg_listen_nfcf); | |
539 | ||
540 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, | |
541 | digital_tg_listen_nfcf); | |
542 | } | |
543 | } | |
544 | ||
59ee2361 | 545 | if (!ddev->poll_tech_count) { |
26042530 | 546 | pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n", |
59ee2361 TE |
547 | matching_im_protocols, matching_tm_protocols); |
548 | return -EINVAL; | |
549 | } | |
550 | ||
7854a445 | 551 | schedule_delayed_work(&ddev->poll_work, 0); |
59ee2361 TE |
552 | |
553 | return 0; | |
4b10884e TE |
554 | } |
555 | ||
556 | static void digital_stop_poll(struct nfc_dev *nfc_dev) | |
557 | { | |
59ee2361 TE |
558 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
559 | ||
560 | mutex_lock(&ddev->poll_lock); | |
561 | ||
562 | if (!ddev->poll_tech_count) { | |
26042530 | 563 | pr_err("Polling operation was not running\n"); |
59ee2361 TE |
564 | mutex_unlock(&ddev->poll_lock); |
565 | return; | |
566 | } | |
567 | ||
568 | ddev->poll_tech_count = 0; | |
569 | ||
570 | mutex_unlock(&ddev->poll_lock); | |
571 | ||
7854a445 | 572 | cancel_delayed_work_sync(&ddev->poll_work); |
59ee2361 TE |
573 | |
574 | digital_abort_cmd(ddev); | |
4b10884e TE |
575 | } |
576 | ||
577 | static int digital_dev_up(struct nfc_dev *nfc_dev) | |
578 | { | |
59ee2361 TE |
579 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
580 | ||
581 | digital_switch_rf(ddev, 1); | |
582 | ||
583 | return 0; | |
4b10884e TE |
584 | } |
585 | ||
586 | static int digital_dev_down(struct nfc_dev *nfc_dev) | |
587 | { | |
59ee2361 TE |
588 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
589 | ||
590 | digital_switch_rf(ddev, 0); | |
591 | ||
592 | return 0; | |
4b10884e TE |
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 | { | |
7d0911c0 | 599 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
48e10445 TE |
600 | int rc; |
601 | ||
602 | rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); | |
7d0911c0 | 603 | |
48e10445 TE |
604 | if (!rc) |
605 | ddev->curr_protocol = NFC_PROTO_NFC_DEP; | |
606 | ||
607 | return rc; | |
4b10884e TE |
608 | } |
609 | ||
610 | static int digital_dep_link_down(struct nfc_dev *nfc_dev) | |
611 | { | |
7d0911c0 TE |
612 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
613 | ||
3cc952db TE |
614 | digital_abort_cmd(ddev); |
615 | ||
7d0911c0 TE |
616 | ddev->curr_protocol = 0; |
617 | ||
618 | return 0; | |
4b10884e TE |
619 | } |
620 | ||
621 | static int digital_activate_target(struct nfc_dev *nfc_dev, | |
622 | struct nfc_target *target, __u32 protocol) | |
623 | { | |
48e10445 TE |
624 | struct nfc_digital_dev *ddev = nfc_get_drvdata(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 | ||
59ee2361 | 638 | return 0; |
4b10884e TE |
639 | } |
640 | ||
641 | static void digital_deactivate_target(struct nfc_dev *nfc_dev, | |
96d4581f CR |
642 | struct nfc_target *target, |
643 | u8 mode) | |
4b10884e | 644 | { |
59ee2361 TE |
645 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
646 | ||
48e10445 TE |
647 | if (!ddev->curr_protocol) { |
648 | pr_err("No active target\n"); | |
649 | return; | |
650 | } | |
651 | ||
72ad533a | 652 | digital_abort_cmd(ddev); |
59ee2361 | 653 | ddev->curr_protocol = 0; |
4b10884e TE |
654 | } |
655 | ||
656 | static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) | |
657 | { | |
1c7a4c24 TE |
658 | struct nfc_digital_dev *ddev = nfc_get_drvdata(dev); |
659 | ||
660 | return digital_tg_send_dep_res(ddev, skb); | |
4b10884e TE |
661 | } |
662 | ||
2c66daec TE |
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(resp)) { | |
670 | rc = PTR_ERR(resp); | |
c813007f | 671 | resp = NULL; |
2c66daec TE |
672 | goto done; |
673 | } | |
674 | ||
c813007f | 675 | if (ddev->curr_protocol == NFC_PROTO_MIFARE) { |
2c66daec | 676 | rc = digital_in_recv_mifare_res(resp); |
c813007f TE |
677 | /* crc check is done in digital_in_recv_mifare_res() */ |
678 | goto done; | |
679 | } | |
680 | ||
24734607 MG |
681 | if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || |
682 | (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { | |
c813007f TE |
683 | rc = digital_in_iso_dep_pull_sod(ddev, resp); |
684 | if (rc) | |
685 | goto done; | |
686 | } | |
687 | ||
688 | rc = ddev->skb_check_crc(resp); | |
2c66daec | 689 | |
c813007f | 690 | done: |
2c66daec TE |
691 | if (rc) { |
692 | kfree_skb(resp); | |
693 | resp = NULL; | |
694 | } | |
695 | ||
2c66daec TE |
696 | data_exch->cb(data_exch->cb_context, resp, rc); |
697 | ||
698 | kfree(data_exch); | |
699 | } | |
700 | ||
4b10884e TE |
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 | { | |
2c66daec TE |
705 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
706 | struct digital_data_exch *data_exch; | |
c813007f | 707 | int rc; |
2c66daec | 708 | |
ae72c991 | 709 | data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL); |
dcfca27f | 710 | if (!data_exch) |
2c66daec | 711 | return -ENOMEM; |
2c66daec TE |
712 | |
713 | data_exch->cb = cb; | |
714 | data_exch->cb_context = cb_context; | |
715 | ||
6ea7398d TE |
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 | } | |
7d0911c0 | 720 | |
24734607 MG |
721 | if ((ddev->curr_protocol == NFC_PROTO_ISO14443) || |
722 | (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) { | |
c813007f TE |
723 | rc = digital_in_iso_dep_push_sod(ddev, skb); |
724 | if (rc) | |
6ea7398d | 725 | goto exit; |
c813007f TE |
726 | } |
727 | ||
2c66daec TE |
728 | ddev->skb_add_crc(skb); |
729 | ||
6ea7398d TE |
730 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, |
731 | data_exch); | |
732 | ||
733 | exit: | |
734 | if (rc) | |
735 | kfree(data_exch); | |
736 | ||
737 | return rc; | |
4b10884e TE |
738 | } |
739 | ||
f6c802a7 | 740 | static const struct nfc_ops digital_nfc_ops = { |
4b10884e TE |
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 | ||
7186aac9 | 753 | struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops, |
4b10884e TE |
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 || | |
bf30a67c | 762 | !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech)) |
4b10884e TE |
763 | return NULL; |
764 | ||
ae72c991 | 765 | ddev = kzalloc(sizeof(*ddev), GFP_KERNEL); |
26042530 | 766 | if (!ddev) |
4b10884e | 767 | return NULL; |
4b10884e TE |
768 | |
769 | ddev->driver_capabilities = driver_capabilities; | |
770 | ddev->ops = ops; | |
771 | ||
59ee2361 TE |
772 | mutex_init(&ddev->cmd_lock); |
773 | INIT_LIST_HEAD(&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); | |
7854a445 | 779 | INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll); |
59ee2361 TE |
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; | |
8c0695e4 TE |
785 | if (supported_protocols & NFC_PROTO_FELICA_MASK) |
786 | ddev->protocols |= NFC_PROTO_FELICA_MASK; | |
7d0911c0 TE |
787 | if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) |
788 | ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; | |
a381d482 MG |
789 | if (supported_protocols & NFC_PROTO_ISO15693_MASK) |
790 | ddev->protocols |= NFC_PROTO_ISO15693_MASK; | |
12e3d241 TE |
791 | if (supported_protocols & NFC_PROTO_ISO14443_MASK) |
792 | ddev->protocols |= NFC_PROTO_ISO14443_MASK; | |
24734607 MG |
793 | if (supported_protocols & NFC_PROTO_ISO14443_B_MASK) |
794 | ddev->protocols |= NFC_PROTO_ISO14443_B_MASK; | |
59ee2361 TE |
795 | |
796 | ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; | |
797 | ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; | |
4b10884e TE |
798 | |
799 | ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, | |
800 | ddev->tx_headroom, | |
801 | ddev->tx_tailroom); | |
802 | if (!ddev->nfc_dev) { | |
26042530 | 803 | pr_err("nfc_allocate_device failed\n"); |
4b10884e TE |
804 | goto free_dev; |
805 | } | |
806 | ||
807 | nfc_set_drvdata(ddev->nfc_dev, ddev); | |
808 | ||
809 | return ddev; | |
810 | ||
811 | free_dev: | |
812 | kfree(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(ddev->nfc_dev); | |
4b10884e TE |
821 | kfree(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(ddev->nfc_dev); | |
828 | } | |
829 | EXPORT_SYMBOL(nfc_digital_register_device); | |
830 | ||
831 | void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) | |
832 | { | |
59ee2361 TE |
833 | struct digital_cmd *cmd, *n; |
834 | ||
4b10884e | 835 | nfc_unregister_device(ddev->nfc_dev); |
59ee2361 TE |
836 | |
837 | mutex_lock(&ddev->poll_lock); | |
838 | ddev->poll_tech_count = 0; | |
839 | mutex_unlock(&ddev->poll_lock); | |
840 | ||
7854a445 | 841 | cancel_delayed_work_sync(&ddev->poll_work); |
59ee2361 TE |
842 | cancel_work_sync(&ddev->cmd_work); |
843 | cancel_work_sync(&ddev->cmd_complete_work); | |
844 | ||
845 | list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { | |
846 | list_del(&cmd->queue); | |
82e57952 TE |
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(-ENODEV)); | |
854 | ||
1c7a4c24 | 855 | kfree(cmd->mdaa_params); |
59ee2361 TE |
856 | kfree(cmd); |
857 | } | |
4b10884e TE |
858 | } |
859 | EXPORT_SYMBOL(nfc_digital_unregister_device); | |
860 | ||
95c236cc | 861 | MODULE_DESCRIPTION("NFC Digital protocol stack"); |
4b10884e | 862 | MODULE_LICENSE("GPL"); |