1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for NXP PN533 NFC Chip - core functions
4  *
5  * Copyright (C) 2011 Instituto Nokia de Tecnologia
6  * Copyright (C) 2012-2013 Tieto Poland
7  */
8 
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/nfc.h>
14 #include <linux/netdevice.h>
15 #include <net/nfc/nfc.h>
16 #include "pn533.h"
17 
18 #define VERSION "0.3"
19 
20 /* How much time we spend listening for initiators */
21 #define PN533_LISTEN_TIME 2
22 /* Delay between each poll frame (ms) */
23 #define PN533_POLL_INTERVAL 10
24 
25 /* structs for pn533 commands */
26 
27 /* PN533_CMD_GET_FIRMWARE_VERSION */
28 struct pn533_fw_version {
29 	u8 ic;
30 	u8 ver;
31 	u8 rev;
32 	u8 support;
33 };
34 
35 /* PN533_CMD_RF_CONFIGURATION */
36 #define PN533_CFGITEM_RF_FIELD    0x01
37 #define PN533_CFGITEM_TIMING      0x02
38 #define PN533_CFGITEM_MAX_RETRIES 0x05
39 #define PN533_CFGITEM_PASORI      0x82
40 
41 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
42 #define PN533_CFGITEM_RF_FIELD_ON        0x1
43 #define PN533_CFGITEM_RF_FIELD_OFF       0x0
44 
45 #define PN533_CONFIG_TIMING_102 0xb
46 #define PN533_CONFIG_TIMING_204 0xc
47 #define PN533_CONFIG_TIMING_409 0xd
48 #define PN533_CONFIG_TIMING_819 0xe
49 
50 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
51 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
52 
53 struct pn533_config_max_retries {
54 	u8 mx_rty_atr;
55 	u8 mx_rty_psl;
56 	u8 mx_rty_passive_act;
57 } __packed;
58 
59 struct pn533_config_timing {
60 	u8 rfu;
61 	u8 atr_res_timeout;
62 	u8 dep_timeout;
63 } __packed;
64 
65 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
66 
67 /* felica commands opcode */
68 #define PN533_FELICA_OPC_SENSF_REQ 0
69 #define PN533_FELICA_OPC_SENSF_RES 1
70 /* felica SENSF_REQ parameters */
71 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
72 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
73 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
74 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
75 
76 /* type B initiator_data values */
77 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
78 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
79 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
80 
81 union pn533_cmd_poll_initdata {
82 	struct {
83 		u8 afi;
84 		u8 polling_method;
85 	} __packed type_b;
86 	struct {
87 		u8 opcode;
88 		__be16 sc;
89 		u8 rc;
90 		u8 tsn;
91 	} __packed felica;
92 };
93 
94 struct pn533_poll_modulations {
95 	struct {
96 		u8 maxtg;
97 		u8 brty;
98 		union pn533_cmd_poll_initdata initiator_data;
99 	} __packed data;
100 	u8 len;
101 };
102 
103 static const struct pn533_poll_modulations poll_mod[] = {
104 	[PN533_POLL_MOD_106KBPS_A] = {
105 		.data = {
106 			.maxtg = 1,
107 			.brty = 0,
108 		},
109 		.len = 2,
110 	},
111 	[PN533_POLL_MOD_212KBPS_FELICA] = {
112 		.data = {
113 			.maxtg = 1,
114 			.brty = 1,
115 			.initiator_data.felica = {
116 				.opcode = PN533_FELICA_OPC_SENSF_REQ,
117 				.sc = PN533_FELICA_SENSF_SC_ALL,
118 				.rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
119 				.tsn = 0x03,
120 			},
121 		},
122 		.len = 7,
123 	},
124 	[PN533_POLL_MOD_424KBPS_FELICA] = {
125 		.data = {
126 			.maxtg = 1,
127 			.brty = 2,
128 			.initiator_data.felica = {
129 				.opcode = PN533_FELICA_OPC_SENSF_REQ,
130 				.sc = PN533_FELICA_SENSF_SC_ALL,
131 				.rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
132 				.tsn = 0x03,
133 			},
134 		 },
135 		.len = 7,
136 	},
137 	[PN533_POLL_MOD_106KBPS_JEWEL] = {
138 		.data = {
139 			.maxtg = 1,
140 			.brty = 4,
141 		},
142 		.len = 2,
143 	},
144 	[PN533_POLL_MOD_847KBPS_B] = {
145 		.data = {
146 			.maxtg = 1,
147 			.brty = 8,
148 			.initiator_data.type_b = {
149 				.afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
150 				.polling_method =
151 					PN533_TYPE_B_POLL_METHOD_TIMESLOT,
152 			},
153 		},
154 		.len = 3,
155 	},
156 	[PN533_LISTEN_MOD] = {
157 		.len = 0,
158 	},
159 };
160 
161 /* PN533_CMD_IN_ATR */
162 
163 struct pn533_cmd_activate_response {
164 	u8 status;
165 	u8 nfcid3t[10];
166 	u8 didt;
167 	u8 bst;
168 	u8 brt;
169 	u8 to;
170 	u8 ppt;
171 	/* optional */
172 	u8 gt[];
173 } __packed;
174 
175 struct pn533_cmd_jump_dep_response {
176 	u8 status;
177 	u8 tg;
178 	u8 nfcid3t[10];
179 	u8 didt;
180 	u8 bst;
181 	u8 brt;
182 	u8 to;
183 	u8 ppt;
184 	/* optional */
185 	u8 gt[];
186 } __packed;
187 
188 struct pn532_autopoll_resp {
189 	u8 type;
190 	u8 ln;
191 	u8 tg;
192 	u8 tgdata[];
193 };
194 
195 /* PN532_CMD_IN_AUTOPOLL */
196 #define PN532_AUTOPOLL_POLLNR_INFINITE	0xff
197 #define PN532_AUTOPOLL_PERIOD		0x03 /* in units of 150 ms */
198 
199 #define PN532_AUTOPOLL_TYPE_GENERIC_106		0x00
200 #define PN532_AUTOPOLL_TYPE_GENERIC_212		0x01
201 #define PN532_AUTOPOLL_TYPE_GENERIC_424		0x02
202 #define PN532_AUTOPOLL_TYPE_JEWEL		0x04
203 #define PN532_AUTOPOLL_TYPE_MIFARE		0x10
204 #define PN532_AUTOPOLL_TYPE_FELICA212		0x11
205 #define PN532_AUTOPOLL_TYPE_FELICA424		0x12
206 #define PN532_AUTOPOLL_TYPE_ISOA		0x20
207 #define PN532_AUTOPOLL_TYPE_ISOB		0x23
208 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106	0x40
209 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212	0x41
210 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424	0x42
211 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106	0x80
212 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_212	0x81
213 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_424	0x82
214 
215 /* PN533_TG_INIT_AS_TARGET */
216 #define PN533_INIT_TARGET_PASSIVE 0x1
217 #define PN533_INIT_TARGET_DEP 0x2
218 
219 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
220 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
221 #define PN533_INIT_TARGET_RESP_DEP        0x4
222 
223 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
pn533_ext_checksum(u16 value)224 static inline u8 pn533_ext_checksum(u16 value)
225 {
226 	return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
227 }
228 
229 /* The rule: value + checksum = 0 */
pn533_std_checksum(u8 value)230 static inline u8 pn533_std_checksum(u8 value)
231 {
232 	return ~value + 1;
233 }
234 
235 /* The rule: sum(data elements) + checksum = 0 */
pn533_std_data_checksum(u8 * data,int datalen)236 static u8 pn533_std_data_checksum(u8 *data, int datalen)
237 {
238 	u8 sum = 0;
239 	int i;
240 
241 	for (i = 0; i < datalen; i++)
242 		sum += data[i];
243 
244 	return pn533_std_checksum(sum);
245 }
246 
pn533_std_tx_frame_init(void * _frame,u8 cmd_code)247 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
248 {
249 	struct pn533_std_frame *frame = _frame;
250 
251 	frame->preamble = 0;
252 	frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
253 	PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
254 	PN533_FRAME_CMD(frame) = cmd_code;
255 	frame->datalen = 2;
256 }
257 
pn533_std_tx_frame_finish(void * _frame)258 static void pn533_std_tx_frame_finish(void *_frame)
259 {
260 	struct pn533_std_frame *frame = _frame;
261 
262 	frame->datalen_checksum = pn533_std_checksum(frame->datalen);
263 
264 	PN533_STD_FRAME_CHECKSUM(frame) =
265 		pn533_std_data_checksum(frame->data, frame->datalen);
266 
267 	PN533_STD_FRAME_POSTAMBLE(frame) = 0;
268 }
269 
pn533_std_tx_update_payload_len(void * _frame,int len)270 static void pn533_std_tx_update_payload_len(void *_frame, int len)
271 {
272 	struct pn533_std_frame *frame = _frame;
273 
274 	frame->datalen += len;
275 }
276 
pn533_std_rx_frame_is_valid(void * _frame,struct pn533 * dev)277 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
278 {
279 	u8 checksum;
280 	struct pn533_std_frame *stdf = _frame;
281 
282 	if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
283 		return false;
284 
285 	if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
286 		/* Standard frame code */
287 		dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
288 
289 		checksum = pn533_std_checksum(stdf->datalen);
290 		if (checksum != stdf->datalen_checksum)
291 			return false;
292 
293 		checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
294 		if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
295 			return false;
296 	} else {
297 		/* Extended */
298 		struct pn533_ext_frame *eif = _frame;
299 
300 		dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
301 
302 		checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
303 		if (checksum != eif->datalen_checksum)
304 			return false;
305 
306 		/* check data checksum */
307 		checksum = pn533_std_data_checksum(eif->data,
308 						   be16_to_cpu(eif->datalen));
309 		if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
310 			return false;
311 	}
312 
313 	return true;
314 }
315 
pn533_rx_frame_is_ack(void * _frame)316 bool pn533_rx_frame_is_ack(void *_frame)
317 {
318 	struct pn533_std_frame *frame = _frame;
319 
320 	if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
321 		return false;
322 
323 	if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
324 		return false;
325 
326 	return true;
327 }
328 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
329 
pn533_std_rx_frame_size(void * frame)330 static inline int pn533_std_rx_frame_size(void *frame)
331 {
332 	struct pn533_std_frame *f = frame;
333 
334 	/* check for Extended Information frame */
335 	if (PN533_STD_IS_EXTENDED(f)) {
336 		struct pn533_ext_frame *eif = frame;
337 
338 		return sizeof(struct pn533_ext_frame)
339 			+ be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
340 	}
341 
342 	return sizeof(struct pn533_std_frame) + f->datalen +
343 	       PN533_STD_FRAME_TAIL_LEN;
344 }
345 
pn533_std_get_cmd_code(void * frame)346 static u8 pn533_std_get_cmd_code(void *frame)
347 {
348 	struct pn533_std_frame *f = frame;
349 	struct pn533_ext_frame *eif = frame;
350 
351 	if (PN533_STD_IS_EXTENDED(f))
352 		return PN533_FRAME_CMD(eif);
353 	else
354 		return PN533_FRAME_CMD(f);
355 }
356 
pn533_rx_frame_is_cmd_response(struct pn533 * dev,void * frame)357 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
358 {
359 	return (dev->ops->get_cmd_code(frame) ==
360 				PN533_CMD_RESPONSE(dev->cmd->code));
361 }
362 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
363 
364 
365 static struct pn533_frame_ops pn533_std_frame_ops = {
366 	.tx_frame_init = pn533_std_tx_frame_init,
367 	.tx_frame_finish = pn533_std_tx_frame_finish,
368 	.tx_update_payload_len = pn533_std_tx_update_payload_len,
369 	.tx_header_len = PN533_STD_FRAME_HEADER_LEN,
370 	.tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
371 
372 	.rx_is_frame_valid = pn533_std_rx_frame_is_valid,
373 	.rx_frame_size = pn533_std_rx_frame_size,
374 	.rx_header_len = PN533_STD_FRAME_HEADER_LEN,
375 	.rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
376 
377 	.max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
378 	.get_cmd_code = pn533_std_get_cmd_code,
379 };
380 
pn533_build_cmd_frame(struct pn533 * dev,u8 cmd_code,struct sk_buff * skb)381 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
382 				  struct sk_buff *skb)
383 {
384 	/* payload is already there, just update datalen */
385 	int payload_len = skb->len;
386 	struct pn533_frame_ops *ops = dev->ops;
387 
388 
389 	skb_push(skb, ops->tx_header_len);
390 	skb_put(skb, ops->tx_tail_len);
391 
392 	ops->tx_frame_init(skb->data, cmd_code);
393 	ops->tx_update_payload_len(skb->data, payload_len);
394 	ops->tx_frame_finish(skb->data);
395 }
396 
pn533_send_async_complete(struct pn533 * dev)397 static int pn533_send_async_complete(struct pn533 *dev)
398 {
399 	struct pn533_cmd *cmd = dev->cmd;
400 	struct sk_buff *resp;
401 	int status, rc = 0;
402 
403 	if (!cmd) {
404 		dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
405 		goto done;
406 	}
407 
408 	dev_kfree_skb(cmd->req);
409 
410 	status = cmd->status;
411 	resp = cmd->resp;
412 
413 	if (status < 0) {
414 		rc = cmd->complete_cb(dev, cmd->complete_cb_context,
415 				      ERR_PTR(status));
416 		dev_kfree_skb(resp);
417 		goto done;
418 	}
419 
420 	/* when no response is set we got interrupted */
421 	if (!resp)
422 		resp = ERR_PTR(-EINTR);
423 
424 	if (!IS_ERR(resp)) {
425 		skb_pull(resp, dev->ops->rx_header_len);
426 		skb_trim(resp, resp->len - dev->ops->rx_tail_len);
427 	}
428 
429 	rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
430 
431 done:
432 	kfree(cmd);
433 	dev->cmd = NULL;
434 	return rc;
435 }
436 
__pn533_send_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)437 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
438 			      struct sk_buff *req,
439 			      pn533_send_async_complete_t complete_cb,
440 			      void *complete_cb_context)
441 {
442 	struct pn533_cmd *cmd;
443 	int rc = 0;
444 
445 	dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
446 
447 	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
448 	if (!cmd)
449 		return -ENOMEM;
450 
451 	cmd->code = cmd_code;
452 	cmd->req = req;
453 	cmd->complete_cb = complete_cb;
454 	cmd->complete_cb_context = complete_cb_context;
455 
456 	pn533_build_cmd_frame(dev, cmd_code, req);
457 
458 	mutex_lock(&dev->cmd_lock);
459 
460 	if (!dev->cmd_pending) {
461 		dev->cmd = cmd;
462 		rc = dev->phy_ops->send_frame(dev, req);
463 		if (rc) {
464 			dev->cmd = NULL;
465 			goto error;
466 		}
467 
468 		dev->cmd_pending = 1;
469 		goto unlock;
470 	}
471 
472 	dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
473 		__func__, cmd_code);
474 
475 	INIT_LIST_HEAD(&cmd->queue);
476 	list_add_tail(&cmd->queue, &dev->cmd_queue);
477 
478 	goto unlock;
479 
480 error:
481 	kfree(cmd);
482 unlock:
483 	mutex_unlock(&dev->cmd_lock);
484 	return rc;
485 }
486 
pn533_send_data_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)487 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
488 				 struct sk_buff *req,
489 				 pn533_send_async_complete_t complete_cb,
490 				 void *complete_cb_context)
491 {
492 	return __pn533_send_async(dev, cmd_code, req, complete_cb,
493 				complete_cb_context);
494 }
495 
pn533_send_cmd_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)496 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
497 				struct sk_buff *req,
498 				pn533_send_async_complete_t complete_cb,
499 				void *complete_cb_context)
500 {
501 	return __pn533_send_async(dev, cmd_code, req, complete_cb,
502 				complete_cb_context);
503 }
504 
505 /*
506  * pn533_send_cmd_direct_async
507  *
508  * The function sends a priority cmd directly to the chip omitting the cmd
509  * queue. It's intended to be used by chaining mechanism of received responses
510  * where the host has to request every single chunk of data before scheduling
511  * next cmd from the queue.
512  */
pn533_send_cmd_direct_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)513 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
514 				       struct sk_buff *req,
515 				       pn533_send_async_complete_t complete_cb,
516 				       void *complete_cb_context)
517 {
518 	struct pn533_cmd *cmd;
519 	int rc;
520 
521 	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
522 	if (!cmd)
523 		return -ENOMEM;
524 
525 	cmd->code = cmd_code;
526 	cmd->req = req;
527 	cmd->complete_cb = complete_cb;
528 	cmd->complete_cb_context = complete_cb_context;
529 
530 	pn533_build_cmd_frame(dev, cmd_code, req);
531 
532 	dev->cmd = cmd;
533 	rc = dev->phy_ops->send_frame(dev, req);
534 	if (rc < 0) {
535 		dev->cmd = NULL;
536 		kfree(cmd);
537 	}
538 
539 	return rc;
540 }
541 
pn533_wq_cmd_complete(struct work_struct * work)542 static void pn533_wq_cmd_complete(struct work_struct *work)
543 {
544 	struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
545 	int rc;
546 
547 	rc = pn533_send_async_complete(dev);
548 	if (rc != -EINPROGRESS)
549 		queue_work(dev->wq, &dev->cmd_work);
550 }
551 
pn533_wq_cmd(struct work_struct * work)552 static void pn533_wq_cmd(struct work_struct *work)
553 {
554 	struct pn533 *dev = container_of(work, struct pn533, cmd_work);
555 	struct pn533_cmd *cmd;
556 	int rc;
557 
558 	mutex_lock(&dev->cmd_lock);
559 
560 	if (list_empty(&dev->cmd_queue)) {
561 		dev->cmd_pending = 0;
562 		mutex_unlock(&dev->cmd_lock);
563 		return;
564 	}
565 
566 	cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
567 
568 	list_del(&cmd->queue);
569 
570 	mutex_unlock(&dev->cmd_lock);
571 
572 	dev->cmd = cmd;
573 	rc = dev->phy_ops->send_frame(dev, cmd->req);
574 	if (rc < 0) {
575 		dev->cmd = NULL;
576 		dev_kfree_skb(cmd->req);
577 		kfree(cmd);
578 		return;
579 	}
580 
581 }
582 
583 struct pn533_sync_cmd_response {
584 	struct sk_buff *resp;
585 	struct completion done;
586 };
587 
pn533_send_sync_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)588 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
589 				    struct sk_buff *resp)
590 {
591 	struct pn533_sync_cmd_response *arg = _arg;
592 
593 	arg->resp = resp;
594 	complete(&arg->done);
595 
596 	return 0;
597 }
598 
599 /*  pn533_send_cmd_sync
600  *
601  *  Please note the req parameter is freed inside the function to
602  *  limit a number of return value interpretations by the caller.
603  *
604  *  1. negative in case of error during TX path -> req should be freed
605  *
606  *  2. negative in case of error during RX path -> req should not be freed
607  *     as it's been already freed at the beginning of RX path by
608  *     async_complete_cb.
609  *
610  *  3. valid pointer in case of successful RX path
611  *
612  *  A caller has to check a return value with IS_ERR macro. If the test pass,
613  *  the returned pointer is valid.
614  *
615  */
pn533_send_cmd_sync(struct pn533 * dev,u8 cmd_code,struct sk_buff * req)616 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
617 					       struct sk_buff *req)
618 {
619 	int rc;
620 	struct pn533_sync_cmd_response arg;
621 
622 	init_completion(&arg.done);
623 
624 	rc = pn533_send_cmd_async(dev, cmd_code, req,
625 				  pn533_send_sync_complete, &arg);
626 	if (rc) {
627 		dev_kfree_skb(req);
628 		return ERR_PTR(rc);
629 	}
630 
631 	wait_for_completion(&arg.done);
632 
633 	return arg.resp;
634 }
635 
pn533_alloc_skb(struct pn533 * dev,unsigned int size)636 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
637 {
638 	struct sk_buff *skb;
639 
640 	skb = alloc_skb(dev->ops->tx_header_len +
641 			size +
642 			dev->ops->tx_tail_len, GFP_KERNEL);
643 
644 	if (skb)
645 		skb_reserve(skb, dev->ops->tx_header_len);
646 
647 	return skb;
648 }
649 
650 struct pn533_target_type_a {
651 	__be16 sens_res;
652 	u8 sel_res;
653 	u8 nfcid_len;
654 	u8 nfcid_data[];
655 } __packed;
656 
657 
658 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
659 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
660 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
661 
662 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
663 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
664 
665 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
666 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
667 
668 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
669 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
670 #define PN533_TYPE_A_SEL_PROT_DEP 2
671 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
672 
pn533_target_type_a_is_valid(struct pn533_target_type_a * type_a,int target_data_len)673 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
674 							int target_data_len)
675 {
676 	u8 ssd;
677 	u8 platconf;
678 
679 	if (target_data_len < sizeof(struct pn533_target_type_a))
680 		return false;
681 
682 	/*
683 	 * The length check of nfcid[] and ats[] are not being performed because
684 	 * the values are not being used
685 	 */
686 
687 	/* Requirement 4.6.3.3 from NFC Forum Digital Spec */
688 	ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
689 	platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
690 
691 	if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
692 	     platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
693 	    (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
694 	     platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
695 		return false;
696 
697 	/* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
698 	if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
699 		return false;
700 
701 	if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
702 		return false;
703 
704 	return true;
705 }
706 
pn533_target_found_type_a(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)707 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
708 							int tgt_data_len)
709 {
710 	struct pn533_target_type_a *tgt_type_a;
711 
712 	tgt_type_a = (struct pn533_target_type_a *)tgt_data;
713 
714 	if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
715 		return -EPROTO;
716 
717 	switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
718 	case PN533_TYPE_A_SEL_PROT_MIFARE:
719 		nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
720 		break;
721 	case PN533_TYPE_A_SEL_PROT_ISO14443:
722 		nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
723 		break;
724 	case PN533_TYPE_A_SEL_PROT_DEP:
725 		nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
726 		break;
727 	case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
728 		nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
729 							NFC_PROTO_NFC_DEP_MASK;
730 		break;
731 	}
732 
733 	nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
734 	nfc_tgt->sel_res = tgt_type_a->sel_res;
735 	nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
736 	memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
737 
738 	return 0;
739 }
740 
741 struct pn533_target_felica {
742 	u8 pol_res;
743 	u8 opcode;
744 	u8 nfcid2[NFC_NFCID2_MAXSIZE];
745 	u8 pad[8];
746 	/* optional */
747 	u8 syst_code[];
748 } __packed;
749 
750 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
751 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
752 
pn533_target_felica_is_valid(struct pn533_target_felica * felica,int target_data_len)753 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
754 							int target_data_len)
755 {
756 	if (target_data_len < sizeof(struct pn533_target_felica))
757 		return false;
758 
759 	if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
760 		return false;
761 
762 	return true;
763 }
764 
pn533_target_found_felica(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)765 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
766 							int tgt_data_len)
767 {
768 	struct pn533_target_felica *tgt_felica;
769 
770 	tgt_felica = (struct pn533_target_felica *)tgt_data;
771 
772 	if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
773 		return -EPROTO;
774 
775 	if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
776 	    (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
777 		nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
778 	else
779 		nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
780 
781 	memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
782 	nfc_tgt->sensf_res_len = 9;
783 
784 	memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
785 	nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
786 
787 	return 0;
788 }
789 
790 struct pn533_target_jewel {
791 	__be16 sens_res;
792 	u8 jewelid[4];
793 } __packed;
794 
pn533_target_jewel_is_valid(struct pn533_target_jewel * jewel,int target_data_len)795 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
796 							int target_data_len)
797 {
798 	u8 ssd;
799 	u8 platconf;
800 
801 	if (target_data_len < sizeof(struct pn533_target_jewel))
802 		return false;
803 
804 	/* Requirement 4.6.3.3 from NFC Forum Digital Spec */
805 	ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
806 	platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
807 
808 	if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
809 	     platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
810 	    (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
811 	     platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
812 		return false;
813 
814 	return true;
815 }
816 
pn533_target_found_jewel(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)817 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
818 							int tgt_data_len)
819 {
820 	struct pn533_target_jewel *tgt_jewel;
821 
822 	tgt_jewel = (struct pn533_target_jewel *)tgt_data;
823 
824 	if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
825 		return -EPROTO;
826 
827 	nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
828 	nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
829 	nfc_tgt->nfcid1_len = 4;
830 	memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
831 
832 	return 0;
833 }
834 
835 struct pn533_type_b_prot_info {
836 	u8 bitrate;
837 	u8 fsci_type;
838 	u8 fwi_adc_fo;
839 } __packed;
840 
841 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
842 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
843 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
844 
845 struct pn533_type_b_sens_res {
846 	u8 opcode;
847 	u8 nfcid[4];
848 	u8 appdata[4];
849 	struct pn533_type_b_prot_info prot_info;
850 } __packed;
851 
852 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
853 
854 struct pn533_target_type_b {
855 	struct pn533_type_b_sens_res sensb_res;
856 	u8 attrib_res_len;
857 	u8 attrib_res[];
858 } __packed;
859 
pn533_target_type_b_is_valid(struct pn533_target_type_b * type_b,int target_data_len)860 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
861 							int target_data_len)
862 {
863 	if (target_data_len < sizeof(struct pn533_target_type_b))
864 		return false;
865 
866 	if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
867 		return false;
868 
869 	if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
870 						PN533_TYPE_B_PROT_TYPE_RFU_MASK)
871 		return false;
872 
873 	return true;
874 }
875 
pn533_target_found_type_b(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)876 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
877 							int tgt_data_len)
878 {
879 	struct pn533_target_type_b *tgt_type_b;
880 
881 	tgt_type_b = (struct pn533_target_type_b *)tgt_data;
882 
883 	if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
884 		return -EPROTO;
885 
886 	nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
887 
888 	return 0;
889 }
890 
891 static void pn533_poll_reset_mod_list(struct pn533 *dev);
pn533_target_found(struct pn533 * dev,u8 tg,u8 * tgdata,int tgdata_len)892 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
893 			      int tgdata_len)
894 {
895 	struct nfc_target nfc_tgt;
896 	int rc;
897 
898 	dev_dbg(dev->dev, "%s: modulation=%d\n",
899 		__func__, dev->poll_mod_curr);
900 
901 	if (tg != 1)
902 		return -EPROTO;
903 
904 	memset(&nfc_tgt, 0, sizeof(struct nfc_target));
905 
906 	switch (dev->poll_mod_curr) {
907 	case PN533_POLL_MOD_106KBPS_A:
908 		rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
909 		break;
910 	case PN533_POLL_MOD_212KBPS_FELICA:
911 	case PN533_POLL_MOD_424KBPS_FELICA:
912 		rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
913 		break;
914 	case PN533_POLL_MOD_106KBPS_JEWEL:
915 		rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
916 		break;
917 	case PN533_POLL_MOD_847KBPS_B:
918 		rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
919 		break;
920 	default:
921 		nfc_err(dev->dev,
922 			"Unknown current poll modulation\n");
923 		return -EPROTO;
924 	}
925 
926 	if (rc)
927 		return rc;
928 
929 	if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
930 		dev_dbg(dev->dev,
931 			"The Tg found doesn't have the desired protocol\n");
932 		return -EAGAIN;
933 	}
934 
935 	dev_dbg(dev->dev,
936 		"Target found - supported protocols: 0x%x\n",
937 		nfc_tgt.supported_protocols);
938 
939 	dev->tgt_available_prots = nfc_tgt.supported_protocols;
940 
941 	pn533_poll_reset_mod_list(dev);
942 	nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
943 
944 	return 0;
945 }
946 
pn533_poll_next_mod(struct pn533 * dev)947 static inline void pn533_poll_next_mod(struct pn533 *dev)
948 {
949 	dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
950 }
951 
pn533_poll_reset_mod_list(struct pn533 * dev)952 static void pn533_poll_reset_mod_list(struct pn533 *dev)
953 {
954 	dev->poll_mod_count = 0;
955 }
956 
pn533_poll_add_mod(struct pn533 * dev,u8 mod_index)957 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
958 {
959 	dev->poll_mod_active[dev->poll_mod_count] =
960 		(struct pn533_poll_modulations *)&poll_mod[mod_index];
961 	dev->poll_mod_count++;
962 }
963 
pn533_poll_create_mod_list(struct pn533 * dev,u32 im_protocols,u32 tm_protocols)964 static void pn533_poll_create_mod_list(struct pn533 *dev,
965 				       u32 im_protocols, u32 tm_protocols)
966 {
967 	pn533_poll_reset_mod_list(dev);
968 
969 	if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
970 	    (im_protocols & NFC_PROTO_ISO14443_MASK) ||
971 	    (im_protocols & NFC_PROTO_NFC_DEP_MASK))
972 		pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
973 
974 	if (im_protocols & NFC_PROTO_FELICA_MASK ||
975 	    im_protocols & NFC_PROTO_NFC_DEP_MASK) {
976 		pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
977 		pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
978 	}
979 
980 	if (im_protocols & NFC_PROTO_JEWEL_MASK)
981 		pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
982 
983 	if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
984 		pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
985 
986 	if (tm_protocols)
987 		pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
988 }
989 
pn533_start_poll_complete(struct pn533 * dev,struct sk_buff * resp)990 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
991 {
992 	u8 nbtg, tg, *tgdata;
993 	int rc, tgdata_len;
994 
995 	/* Toggle the DEP polling */
996 	if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
997 		dev->poll_dep = 1;
998 
999 	nbtg = resp->data[0];
1000 	tg = resp->data[1];
1001 	tgdata = &resp->data[2];
1002 	tgdata_len = resp->len - 2;  /* nbtg + tg */
1003 
1004 	if (nbtg) {
1005 		rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1006 
1007 		/* We must stop the poll after a valid target found */
1008 		if (rc == 0)
1009 			return 0;
1010 	}
1011 
1012 	return -EAGAIN;
1013 }
1014 
pn533_alloc_poll_tg_frame(struct pn533 * dev)1015 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1016 {
1017 	struct sk_buff *skb;
1018 	u8 *felica, *nfcid3;
1019 
1020 	u8 *gbytes = dev->gb;
1021 	size_t gbytes_len = dev->gb_len;
1022 
1023 	u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1024 				0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1025 				0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1026 				0xff, 0xff}; /* System code */
1027 
1028 	u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1029 			       0x0, 0x0, 0x0,
1030 			       0x40}; /* SEL_RES for DEP */
1031 
1032 	unsigned int skb_len = 36 + /*
1033 				     * mode (1), mifare (6),
1034 				     * felica (18), nfcid3 (10), gb_len (1)
1035 				     */
1036 			       gbytes_len +
1037 			       1;  /* len Tk*/
1038 
1039 	skb = pn533_alloc_skb(dev, skb_len);
1040 	if (!skb)
1041 		return NULL;
1042 
1043 	/* DEP support only */
1044 	skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1045 
1046 	/* MIFARE params */
1047 	skb_put_data(skb, mifare_params, 6);
1048 
1049 	/* Felica params */
1050 	felica = skb_put_data(skb, felica_params, 18);
1051 	get_random_bytes(felica + 2, 6);
1052 
1053 	/* NFCID3 */
1054 	nfcid3 = skb_put_zero(skb, 10);
1055 	memcpy(nfcid3, felica, 8);
1056 
1057 	/* General bytes */
1058 	skb_put_u8(skb, gbytes_len);
1059 
1060 	skb_put_data(skb, gbytes, gbytes_len);
1061 
1062 	/* Len Tk */
1063 	skb_put_u8(skb, 0);
1064 
1065 	return skb;
1066 }
1067 
1068 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1069 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1070 
pn533_tm_get_data_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1071 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1072 				      struct sk_buff *resp)
1073 {
1074 	struct sk_buff *skb;
1075 	u8 status, ret, mi;
1076 	int rc;
1077 
1078 	if (IS_ERR(resp)) {
1079 		skb_queue_purge(&dev->resp_q);
1080 		return PTR_ERR(resp);
1081 	}
1082 
1083 	status = resp->data[0];
1084 
1085 	ret = status & PN533_CMD_RET_MASK;
1086 	mi = status & PN533_CMD_MI_MASK;
1087 
1088 	skb_pull(resp, sizeof(status));
1089 
1090 	if (ret != PN533_CMD_RET_SUCCESS) {
1091 		rc = -EIO;
1092 		goto error;
1093 	}
1094 
1095 	skb_queue_tail(&dev->resp_q, resp);
1096 
1097 	if (mi) {
1098 		queue_work(dev->wq, &dev->mi_tm_rx_work);
1099 		return -EINPROGRESS;
1100 	}
1101 
1102 	skb = pn533_build_response(dev);
1103 	if (!skb) {
1104 		rc = -EIO;
1105 		goto error;
1106 	}
1107 
1108 	return nfc_tm_data_received(dev->nfc_dev, skb);
1109 
1110 error:
1111 	nfc_tm_deactivated(dev->nfc_dev);
1112 	dev->tgt_mode = 0;
1113 	skb_queue_purge(&dev->resp_q);
1114 	dev_kfree_skb(resp);
1115 
1116 	return rc;
1117 }
1118 
pn533_wq_tm_mi_recv(struct work_struct * work)1119 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1120 {
1121 	struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1122 	struct sk_buff *skb;
1123 	int rc;
1124 
1125 	skb = pn533_alloc_skb(dev, 0);
1126 	if (!skb)
1127 		return;
1128 
1129 	rc = pn533_send_cmd_direct_async(dev,
1130 					PN533_CMD_TG_GET_DATA,
1131 					skb,
1132 					pn533_tm_get_data_complete,
1133 					NULL);
1134 
1135 	if (rc < 0)
1136 		dev_kfree_skb(skb);
1137 }
1138 
1139 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1140 				  struct sk_buff *resp);
pn533_wq_tm_mi_send(struct work_struct * work)1141 static void pn533_wq_tm_mi_send(struct work_struct *work)
1142 {
1143 	struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1144 	struct sk_buff *skb;
1145 	int rc;
1146 
1147 	/* Grab the first skb in the queue */
1148 	skb = skb_dequeue(&dev->fragment_skb);
1149 	if (skb == NULL) {	/* No more data */
1150 		/* Reset the queue for future use */
1151 		skb_queue_head_init(&dev->fragment_skb);
1152 		goto error;
1153 	}
1154 
1155 	/* last entry - remove MI bit */
1156 	if (skb_queue_len(&dev->fragment_skb) == 0) {
1157 		rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1158 					skb, pn533_tm_send_complete, NULL);
1159 	} else
1160 		rc = pn533_send_cmd_direct_async(dev,
1161 					PN533_CMD_TG_SET_META_DATA,
1162 					skb, pn533_tm_send_complete, NULL);
1163 
1164 	if (rc == 0) /* success */
1165 		return;
1166 
1167 	dev_err(dev->dev,
1168 		"Error %d when trying to perform set meta data_exchange", rc);
1169 
1170 	dev_kfree_skb(skb);
1171 
1172 error:
1173 	dev->phy_ops->send_ack(dev, GFP_KERNEL);
1174 	queue_work(dev->wq, &dev->cmd_work);
1175 }
1176 
pn533_wq_tg_get_data(struct work_struct * work)1177 static void pn533_wq_tg_get_data(struct work_struct *work)
1178 {
1179 	struct pn533 *dev = container_of(work, struct pn533, tg_work);
1180 	struct sk_buff *skb;
1181 	int rc;
1182 
1183 	skb = pn533_alloc_skb(dev, 0);
1184 	if (!skb)
1185 		return;
1186 
1187 	rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1188 				   pn533_tm_get_data_complete, NULL);
1189 
1190 	if (rc < 0)
1191 		dev_kfree_skb(skb);
1192 }
1193 
1194 #define ATR_REQ_GB_OFFSET 17
pn533_init_target_complete(struct pn533 * dev,struct sk_buff * resp)1195 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1196 {
1197 	u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1198 	size_t gb_len;
1199 	int rc;
1200 
1201 	if (resp->len < ATR_REQ_GB_OFFSET + 1)
1202 		return -EINVAL;
1203 
1204 	mode = resp->data[0];
1205 	cmd = &resp->data[1];
1206 
1207 	dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1208 		mode, resp->len);
1209 
1210 	if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1211 	    PN533_INIT_TARGET_RESP_ACTIVE)
1212 		comm_mode = NFC_COMM_ACTIVE;
1213 
1214 	if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1215 		return -EOPNOTSUPP;
1216 
1217 	gb = cmd + ATR_REQ_GB_OFFSET;
1218 	gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1219 
1220 	rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1221 			      comm_mode, gb, gb_len);
1222 	if (rc < 0) {
1223 		nfc_err(dev->dev,
1224 			"Error when signaling target activation\n");
1225 		return rc;
1226 	}
1227 
1228 	dev->tgt_mode = 1;
1229 	queue_work(dev->wq, &dev->tg_work);
1230 
1231 	return 0;
1232 }
1233 
pn533_listen_mode_timer(struct timer_list * t)1234 static void pn533_listen_mode_timer(struct timer_list *t)
1235 {
1236 	struct pn533 *dev = from_timer(dev, t, listen_timer);
1237 
1238 	dev->cancel_listen = 1;
1239 
1240 	pn533_poll_next_mod(dev);
1241 
1242 	queue_delayed_work(dev->wq, &dev->poll_work,
1243 			   msecs_to_jiffies(PN533_POLL_INTERVAL));
1244 }
1245 
pn533_rf_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1246 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1247 			     struct sk_buff *resp)
1248 {
1249 	int rc = 0;
1250 
1251 	if (IS_ERR(resp)) {
1252 		rc = PTR_ERR(resp);
1253 
1254 		nfc_err(dev->dev, "RF setting error %d\n", rc);
1255 
1256 		return rc;
1257 	}
1258 
1259 	queue_delayed_work(dev->wq, &dev->poll_work,
1260 			   msecs_to_jiffies(PN533_POLL_INTERVAL));
1261 
1262 	dev_kfree_skb(resp);
1263 	return rc;
1264 }
1265 
pn533_wq_rf(struct work_struct * work)1266 static void pn533_wq_rf(struct work_struct *work)
1267 {
1268 	struct pn533 *dev = container_of(work, struct pn533, rf_work);
1269 	struct sk_buff *skb;
1270 	int rc;
1271 
1272 	skb = pn533_alloc_skb(dev, 2);
1273 	if (!skb)
1274 		return;
1275 
1276 	skb_put_u8(skb, PN533_CFGITEM_RF_FIELD);
1277 	skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA);
1278 
1279 	rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1280 				  pn533_rf_complete, NULL);
1281 	if (rc < 0) {
1282 		dev_kfree_skb(skb);
1283 		nfc_err(dev->dev, "RF setting error %d\n", rc);
1284 	}
1285 }
1286 
pn533_poll_dep_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1287 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1288 				   struct sk_buff *resp)
1289 {
1290 	struct pn533_cmd_jump_dep_response *rsp;
1291 	struct nfc_target nfc_target;
1292 	u8 target_gt_len;
1293 	int rc;
1294 
1295 	if (IS_ERR(resp))
1296 		return PTR_ERR(resp);
1297 
1298 	memset(&nfc_target, 0, sizeof(struct nfc_target));
1299 
1300 	rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1301 
1302 	rc = rsp->status & PN533_CMD_RET_MASK;
1303 	if (rc != PN533_CMD_RET_SUCCESS) {
1304 		/* Not target found, turn radio off */
1305 		queue_work(dev->wq, &dev->rf_work);
1306 
1307 		dev_kfree_skb(resp);
1308 		return 0;
1309 	}
1310 
1311 	dev_dbg(dev->dev, "Creating new target");
1312 
1313 	nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1314 	nfc_target.nfcid1_len = 10;
1315 	memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1316 	rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1317 	if (rc)
1318 		goto error;
1319 
1320 	dev->tgt_available_prots = 0;
1321 	dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1322 
1323 	/* ATR_RES general bytes are located at offset 17 */
1324 	target_gt_len = resp->len - 17;
1325 	rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1326 					  rsp->gt, target_gt_len);
1327 	if (!rc) {
1328 		rc = nfc_dep_link_is_up(dev->nfc_dev,
1329 					dev->nfc_dev->targets[0].idx,
1330 					0, NFC_RF_INITIATOR);
1331 
1332 		if (!rc)
1333 			pn533_poll_reset_mod_list(dev);
1334 	}
1335 error:
1336 	dev_kfree_skb(resp);
1337 	return rc;
1338 }
1339 
1340 #define PASSIVE_DATA_LEN 5
pn533_poll_dep(struct nfc_dev * nfc_dev)1341 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1342 {
1343 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1344 	struct sk_buff *skb;
1345 	int rc, skb_len;
1346 	u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1347 	u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1348 
1349 	if (!dev->gb) {
1350 		dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1351 
1352 		if (!dev->gb || !dev->gb_len) {
1353 			dev->poll_dep = 0;
1354 			queue_work(dev->wq, &dev->rf_work);
1355 		}
1356 	}
1357 
1358 	skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1359 	skb_len += PASSIVE_DATA_LEN;
1360 
1361 	/* NFCID3 */
1362 	skb_len += NFC_NFCID3_MAXSIZE;
1363 	nfcid3[0] = 0x1;
1364 	nfcid3[1] = 0xfe;
1365 	get_random_bytes(nfcid3 + 2, 6);
1366 
1367 	skb = pn533_alloc_skb(dev, skb_len);
1368 	if (!skb)
1369 		return -ENOMEM;
1370 
1371 	skb_put_u8(skb, 0x01);  /* Active */
1372 	skb_put_u8(skb, 0x02);  /* 424 kbps */
1373 
1374 	next = skb_put(skb, 1);  /* Next */
1375 	*next = 0;
1376 
1377 	/* Copy passive data */
1378 	skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1379 	*next |= 1;
1380 
1381 	/* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1382 	skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1383 	*next |= 2;
1384 
1385 	skb_put_data(skb, dev->gb, dev->gb_len);
1386 	*next |= 4; /* We have some Gi */
1387 
1388 	rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1389 				  pn533_poll_dep_complete, NULL);
1390 
1391 	if (rc < 0)
1392 		dev_kfree_skb(skb);
1393 
1394 	return rc;
1395 }
1396 
pn533_autopoll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1397 static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
1398 			       struct sk_buff *resp)
1399 {
1400 	struct pn532_autopoll_resp *apr;
1401 	struct nfc_target nfc_tgt;
1402 	u8 nbtg;
1403 	int rc;
1404 
1405 	if (IS_ERR(resp)) {
1406 		rc = PTR_ERR(resp);
1407 
1408 		nfc_err(dev->dev, "%s  autopoll complete error %d\n",
1409 			__func__, rc);
1410 
1411 		if (rc == -ENOENT) {
1412 			if (dev->poll_mod_count != 0)
1413 				return rc;
1414 			goto stop_poll;
1415 		} else if (rc < 0) {
1416 			nfc_err(dev->dev,
1417 				"Error %d when running autopoll\n", rc);
1418 			goto stop_poll;
1419 		}
1420 	}
1421 
1422 	nbtg = resp->data[0];
1423 	if ((nbtg > 2) || (nbtg <= 0))
1424 		return -EAGAIN;
1425 
1426 	apr = (struct pn532_autopoll_resp *)&resp->data[1];
1427 	while (nbtg--) {
1428 		memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1429 		switch (apr->type) {
1430 		case PN532_AUTOPOLL_TYPE_ISOA:
1431 			dev_dbg(dev->dev, "ISOA\n");
1432 			rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1433 						       apr->ln - 1);
1434 			break;
1435 		case PN532_AUTOPOLL_TYPE_FELICA212:
1436 		case PN532_AUTOPOLL_TYPE_FELICA424:
1437 			dev_dbg(dev->dev, "FELICA\n");
1438 			rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
1439 						       apr->ln - 1);
1440 			break;
1441 		case PN532_AUTOPOLL_TYPE_JEWEL:
1442 			dev_dbg(dev->dev, "JEWEL\n");
1443 			rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
1444 						      apr->ln - 1);
1445 			break;
1446 		case PN532_AUTOPOLL_TYPE_ISOB:
1447 			dev_dbg(dev->dev, "ISOB\n");
1448 			rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
1449 						       apr->ln - 1);
1450 			break;
1451 		case PN532_AUTOPOLL_TYPE_MIFARE:
1452 			dev_dbg(dev->dev, "Mifare\n");
1453 			rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1454 						       apr->ln - 1);
1455 			break;
1456 		default:
1457 			nfc_err(dev->dev,
1458 				    "Unknown current poll modulation\n");
1459 			rc = -EPROTO;
1460 		}
1461 
1462 		if (rc)
1463 			goto done;
1464 
1465 		if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1466 			nfc_err(dev->dev,
1467 				    "The Tg found doesn't have the desired protocol\n");
1468 			rc = -EAGAIN;
1469 			goto done;
1470 		}
1471 
1472 		dev->tgt_available_prots = nfc_tgt.supported_protocols;
1473 		apr = (struct pn532_autopoll_resp *)
1474 			(apr->tgdata + (apr->ln - 1));
1475 	}
1476 
1477 	pn533_poll_reset_mod_list(dev);
1478 	nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1479 
1480 done:
1481 	dev_kfree_skb(resp);
1482 	return rc;
1483 
1484 stop_poll:
1485 	nfc_err(dev->dev, "autopoll operation has been stopped\n");
1486 
1487 	pn533_poll_reset_mod_list(dev);
1488 	dev->poll_protocols = 0;
1489 	return rc;
1490 }
1491 
pn533_poll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1492 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1493 			       struct sk_buff *resp)
1494 {
1495 	struct pn533_poll_modulations *cur_mod;
1496 	int rc;
1497 
1498 	if (IS_ERR(resp)) {
1499 		rc = PTR_ERR(resp);
1500 
1501 		nfc_err(dev->dev, "%s  Poll complete error %d\n",
1502 			__func__, rc);
1503 
1504 		if (rc == -ENOENT) {
1505 			if (dev->poll_mod_count != 0)
1506 				return rc;
1507 			goto stop_poll;
1508 		} else if (rc < 0) {
1509 			nfc_err(dev->dev,
1510 				"Error %d when running poll\n", rc);
1511 			goto stop_poll;
1512 		}
1513 	}
1514 
1515 	cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1516 
1517 	if (cur_mod->len == 0) { /* Target mode */
1518 		del_timer(&dev->listen_timer);
1519 		rc = pn533_init_target_complete(dev, resp);
1520 		goto done;
1521 	}
1522 
1523 	/* Initiator mode */
1524 	rc = pn533_start_poll_complete(dev, resp);
1525 	if (!rc)
1526 		goto done;
1527 
1528 	if (!dev->poll_mod_count) {
1529 		dev_dbg(dev->dev, "Polling has been stopped\n");
1530 		goto done;
1531 	}
1532 
1533 	pn533_poll_next_mod(dev);
1534 	/* Not target found, turn radio off */
1535 	queue_work(dev->wq, &dev->rf_work);
1536 
1537 done:
1538 	dev_kfree_skb(resp);
1539 	return rc;
1540 
1541 stop_poll:
1542 	nfc_err(dev->dev, "Polling operation has been stopped\n");
1543 
1544 	pn533_poll_reset_mod_list(dev);
1545 	dev->poll_protocols = 0;
1546 	return rc;
1547 }
1548 
pn533_alloc_poll_in_frame(struct pn533 * dev,struct pn533_poll_modulations * mod)1549 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1550 					struct pn533_poll_modulations *mod)
1551 {
1552 	struct sk_buff *skb;
1553 
1554 	skb = pn533_alloc_skb(dev, mod->len);
1555 	if (!skb)
1556 		return NULL;
1557 
1558 	skb_put_data(skb, &mod->data, mod->len);
1559 
1560 	return skb;
1561 }
1562 
pn533_send_poll_frame(struct pn533 * dev)1563 static int pn533_send_poll_frame(struct pn533 *dev)
1564 {
1565 	struct pn533_poll_modulations *mod;
1566 	struct sk_buff *skb;
1567 	int rc;
1568 	u8 cmd_code;
1569 
1570 	mod = dev->poll_mod_active[dev->poll_mod_curr];
1571 
1572 	dev_dbg(dev->dev, "%s mod len %d\n",
1573 		__func__, mod->len);
1574 
1575 	if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1576 		dev->poll_dep = 0;
1577 		return pn533_poll_dep(dev->nfc_dev);
1578 	}
1579 
1580 	if (mod->len == 0) {  /* Listen mode */
1581 		cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1582 		skb = pn533_alloc_poll_tg_frame(dev);
1583 	} else {  /* Polling mode */
1584 		cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1585 		skb = pn533_alloc_poll_in_frame(dev, mod);
1586 	}
1587 
1588 	if (!skb) {
1589 		nfc_err(dev->dev, "Failed to allocate skb\n");
1590 		return -ENOMEM;
1591 	}
1592 
1593 	rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1594 				  NULL);
1595 	if (rc < 0) {
1596 		dev_kfree_skb(skb);
1597 		nfc_err(dev->dev, "Polling loop error %d\n", rc);
1598 	}
1599 
1600 	return rc;
1601 }
1602 
pn533_wq_poll(struct work_struct * work)1603 static void pn533_wq_poll(struct work_struct *work)
1604 {
1605 	struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1606 	struct pn533_poll_modulations *cur_mod;
1607 	int rc;
1608 
1609 	cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1610 
1611 	dev_dbg(dev->dev,
1612 		"%s cancel_listen %d modulation len %d\n",
1613 		__func__, dev->cancel_listen, cur_mod->len);
1614 
1615 	if (dev->cancel_listen == 1) {
1616 		dev->cancel_listen = 0;
1617 		dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1618 	}
1619 
1620 	rc = pn533_send_poll_frame(dev);
1621 	if (rc)
1622 		return;
1623 
1624 	if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1625 		mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1626 }
1627 
pn533_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)1628 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1629 			    u32 im_protocols, u32 tm_protocols)
1630 {
1631 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1632 	struct pn533_poll_modulations *cur_mod;
1633 	struct sk_buff *skb;
1634 	u8 rand_mod;
1635 	int rc;
1636 
1637 	dev_dbg(dev->dev,
1638 		"%s: im protocols 0x%x tm protocols 0x%x\n",
1639 		__func__, im_protocols, tm_protocols);
1640 
1641 	if (dev->tgt_active_prot) {
1642 		nfc_err(dev->dev,
1643 			"Cannot poll with a target already activated\n");
1644 		return -EBUSY;
1645 	}
1646 
1647 	if (dev->tgt_mode) {
1648 		nfc_err(dev->dev,
1649 			"Cannot poll while already being activated\n");
1650 		return -EBUSY;
1651 	}
1652 
1653 	if (tm_protocols) {
1654 		dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1655 		if (dev->gb == NULL)
1656 			tm_protocols = 0;
1657 	}
1658 
1659 	dev->poll_protocols = im_protocols;
1660 	dev->listen_protocols = tm_protocols;
1661 	if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
1662 		skb = pn533_alloc_skb(dev, 4 + 6);
1663 		if (!skb)
1664 			return -ENOMEM;
1665 
1666 		*((u8 *)skb_put(skb, sizeof(u8))) =
1667 			PN532_AUTOPOLL_POLLNR_INFINITE;
1668 		*((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
1669 
1670 		if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
1671 				(im_protocols & NFC_PROTO_ISO14443_MASK) &&
1672 				(im_protocols & NFC_PROTO_NFC_DEP_MASK))
1673 			*((u8 *)skb_put(skb, sizeof(u8))) =
1674 				PN532_AUTOPOLL_TYPE_GENERIC_106;
1675 		else {
1676 			if (im_protocols & NFC_PROTO_MIFARE_MASK)
1677 				*((u8 *)skb_put(skb, sizeof(u8))) =
1678 					PN532_AUTOPOLL_TYPE_MIFARE;
1679 
1680 			if (im_protocols & NFC_PROTO_ISO14443_MASK)
1681 				*((u8 *)skb_put(skb, sizeof(u8))) =
1682 					PN532_AUTOPOLL_TYPE_ISOA;
1683 
1684 			if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1685 				*((u8 *)skb_put(skb, sizeof(u8))) =
1686 					PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
1687 				*((u8 *)skb_put(skb, sizeof(u8))) =
1688 					PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
1689 				*((u8 *)skb_put(skb, sizeof(u8))) =
1690 					PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
1691 			}
1692 		}
1693 
1694 		if (im_protocols & NFC_PROTO_FELICA_MASK ||
1695 				im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1696 			*((u8 *)skb_put(skb, sizeof(u8))) =
1697 				PN532_AUTOPOLL_TYPE_FELICA212;
1698 			*((u8 *)skb_put(skb, sizeof(u8))) =
1699 				PN532_AUTOPOLL_TYPE_FELICA424;
1700 		}
1701 
1702 		if (im_protocols & NFC_PROTO_JEWEL_MASK)
1703 			*((u8 *)skb_put(skb, sizeof(u8))) =
1704 				PN532_AUTOPOLL_TYPE_JEWEL;
1705 
1706 		if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1707 			*((u8 *)skb_put(skb, sizeof(u8))) =
1708 				PN532_AUTOPOLL_TYPE_ISOB;
1709 
1710 		if (tm_protocols)
1711 			*((u8 *)skb_put(skb, sizeof(u8))) =
1712 				PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
1713 
1714 		rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
1715 				pn533_autopoll_complete, NULL);
1716 
1717 		if (rc < 0)
1718 			dev_kfree_skb(skb);
1719 		else
1720 			dev->poll_mod_count++;
1721 
1722 		return rc;
1723 	}
1724 
1725 	pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1726 
1727 	/* Do not always start polling from the same modulation */
1728 	get_random_bytes(&rand_mod, sizeof(rand_mod));
1729 	rand_mod %= dev->poll_mod_count;
1730 	dev->poll_mod_curr = rand_mod;
1731 
1732 	cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1733 
1734 	rc = pn533_send_poll_frame(dev);
1735 
1736 	/* Start listen timer */
1737 	if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1738 		mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1739 
1740 	return rc;
1741 }
1742 
pn533_stop_poll(struct nfc_dev * nfc_dev)1743 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1744 {
1745 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1746 
1747 	del_timer(&dev->listen_timer);
1748 
1749 	if (!dev->poll_mod_count) {
1750 		dev_dbg(dev->dev,
1751 			"Polling operation was not running\n");
1752 		return;
1753 	}
1754 
1755 	dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1756 	flush_delayed_work(&dev->poll_work);
1757 	pn533_poll_reset_mod_list(dev);
1758 }
1759 
pn533_activate_target_nfcdep(struct pn533 * dev)1760 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1761 {
1762 	struct pn533_cmd_activate_response *rsp;
1763 	u16 gt_len;
1764 	int rc;
1765 	struct sk_buff *skb;
1766 	struct sk_buff *resp;
1767 
1768 	skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1769 	if (!skb)
1770 		return -ENOMEM;
1771 
1772 	skb_put_u8(skb, 1); /* TG */
1773 	skb_put_u8(skb, 0); /* Next */
1774 
1775 	resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1776 	if (IS_ERR(resp))
1777 		return PTR_ERR(resp);
1778 
1779 	rsp = (struct pn533_cmd_activate_response *)resp->data;
1780 	rc = rsp->status & PN533_CMD_RET_MASK;
1781 	if (rc != PN533_CMD_RET_SUCCESS) {
1782 		nfc_err(dev->dev,
1783 			"Target activation failed (error 0x%x)\n", rc);
1784 		dev_kfree_skb(resp);
1785 		return -EIO;
1786 	}
1787 
1788 	/* ATR_RES general bytes are located at offset 16 */
1789 	gt_len = resp->len - 16;
1790 	rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1791 
1792 	dev_kfree_skb(resp);
1793 	return rc;
1794 }
1795 
pn533_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)1796 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1797 				 struct nfc_target *target, u32 protocol)
1798 {
1799 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1800 	int rc;
1801 
1802 	dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1803 
1804 	if (dev->poll_mod_count) {
1805 		nfc_err(dev->dev,
1806 			"Cannot activate while polling\n");
1807 		return -EBUSY;
1808 	}
1809 
1810 	if (dev->tgt_active_prot) {
1811 		nfc_err(dev->dev,
1812 			"There is already an active target\n");
1813 		return -EBUSY;
1814 	}
1815 
1816 	if (!dev->tgt_available_prots) {
1817 		nfc_err(dev->dev,
1818 			"There is no available target to activate\n");
1819 		return -EINVAL;
1820 	}
1821 
1822 	if (!(dev->tgt_available_prots & (1 << protocol))) {
1823 		nfc_err(dev->dev,
1824 			"Target doesn't support requested proto %u\n",
1825 			protocol);
1826 		return -EINVAL;
1827 	}
1828 
1829 	if (protocol == NFC_PROTO_NFC_DEP) {
1830 		rc = pn533_activate_target_nfcdep(dev);
1831 		if (rc) {
1832 			nfc_err(dev->dev,
1833 				"Activating target with DEP failed %d\n", rc);
1834 			return rc;
1835 		}
1836 	}
1837 
1838 	dev->tgt_active_prot = protocol;
1839 	dev->tgt_available_prots = 0;
1840 
1841 	return 0;
1842 }
1843 
pn533_deactivate_target_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1844 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1845 			     struct sk_buff *resp)
1846 {
1847 	int rc = 0;
1848 
1849 	if (IS_ERR(resp)) {
1850 		rc = PTR_ERR(resp);
1851 
1852 		nfc_err(dev->dev, "Target release error %d\n", rc);
1853 
1854 		return rc;
1855 	}
1856 
1857 	rc = resp->data[0] & PN533_CMD_RET_MASK;
1858 	if (rc != PN533_CMD_RET_SUCCESS)
1859 		nfc_err(dev->dev,
1860 			"Error 0x%x when releasing the target\n", rc);
1861 
1862 	dev_kfree_skb(resp);
1863 	return rc;
1864 }
1865 
pn533_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)1866 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1867 				    struct nfc_target *target, u8 mode)
1868 {
1869 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1870 	struct sk_buff *skb;
1871 	int rc;
1872 
1873 	if (!dev->tgt_active_prot) {
1874 		nfc_err(dev->dev, "There is no active target\n");
1875 		return;
1876 	}
1877 
1878 	dev->tgt_active_prot = 0;
1879 	skb_queue_purge(&dev->resp_q);
1880 
1881 	skb = pn533_alloc_skb(dev, sizeof(u8));
1882 	if (!skb)
1883 		return;
1884 
1885 	skb_put_u8(skb, 1); /* TG*/
1886 
1887 	rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1888 				  pn533_deactivate_target_complete, NULL);
1889 	if (rc < 0) {
1890 		dev_kfree_skb(skb);
1891 		nfc_err(dev->dev, "Target release error %d\n", rc);
1892 	}
1893 }
1894 
1895 
pn533_in_dep_link_up_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1896 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1897 					 struct sk_buff *resp)
1898 {
1899 	struct pn533_cmd_jump_dep_response *rsp;
1900 	u8 target_gt_len;
1901 	int rc;
1902 	u8 active = *(u8 *)arg;
1903 
1904 	kfree(arg);
1905 
1906 	if (IS_ERR(resp))
1907 		return PTR_ERR(resp);
1908 
1909 	if (dev->tgt_available_prots &&
1910 	    !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1911 		nfc_err(dev->dev,
1912 			"The target does not support DEP\n");
1913 		rc =  -EINVAL;
1914 		goto error;
1915 	}
1916 
1917 	rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1918 
1919 	rc = rsp->status & PN533_CMD_RET_MASK;
1920 	if (rc != PN533_CMD_RET_SUCCESS) {
1921 		nfc_err(dev->dev,
1922 			"Bringing DEP link up failed (error 0x%x)\n", rc);
1923 		goto error;
1924 	}
1925 
1926 	if (!dev->tgt_available_prots) {
1927 		struct nfc_target nfc_target;
1928 
1929 		dev_dbg(dev->dev, "Creating new target\n");
1930 
1931 		memset(&nfc_target, 0, sizeof(struct nfc_target));
1932 
1933 		nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1934 		nfc_target.nfcid1_len = 10;
1935 		memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1936 		rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1937 		if (rc)
1938 			goto error;
1939 
1940 		dev->tgt_available_prots = 0;
1941 	}
1942 
1943 	dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1944 
1945 	/* ATR_RES general bytes are located at offset 17 */
1946 	target_gt_len = resp->len - 17;
1947 	rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1948 					  rsp->gt, target_gt_len);
1949 	if (rc == 0)
1950 		rc = nfc_dep_link_is_up(dev->nfc_dev,
1951 					dev->nfc_dev->targets[0].idx,
1952 					!active, NFC_RF_INITIATOR);
1953 
1954 error:
1955 	dev_kfree_skb(resp);
1956 	return rc;
1957 }
1958 
1959 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
pn533_dep_link_up(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 comm_mode,u8 * gb,size_t gb_len)1960 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1961 			     u8 comm_mode, u8 *gb, size_t gb_len)
1962 {
1963 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1964 	struct sk_buff *skb;
1965 	int rc, skb_len;
1966 	u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1967 	u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1968 
1969 	if (dev->poll_mod_count) {
1970 		nfc_err(dev->dev,
1971 			"Cannot bring the DEP link up while polling\n");
1972 		return -EBUSY;
1973 	}
1974 
1975 	if (dev->tgt_active_prot) {
1976 		nfc_err(dev->dev,
1977 			"There is already an active target\n");
1978 		return -EBUSY;
1979 	}
1980 
1981 	skb_len = 3 + gb_len; /* ActPass + BR + Next */
1982 	skb_len += PASSIVE_DATA_LEN;
1983 
1984 	/* NFCID3 */
1985 	skb_len += NFC_NFCID3_MAXSIZE;
1986 	if (target && !target->nfcid2_len) {
1987 		nfcid3[0] = 0x1;
1988 		nfcid3[1] = 0xfe;
1989 		get_random_bytes(nfcid3 + 2, 6);
1990 	}
1991 
1992 	skb = pn533_alloc_skb(dev, skb_len);
1993 	if (!skb)
1994 		return -ENOMEM;
1995 
1996 	skb_put_u8(skb, !comm_mode);  /* ActPass */
1997 	skb_put_u8(skb, 0x02);  /* 424 kbps */
1998 
1999 	next = skb_put(skb, 1);  /* Next */
2000 	*next = 0;
2001 
2002 	/* Copy passive data */
2003 	skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
2004 	*next |= 1;
2005 
2006 	/* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2007 	if (target && target->nfcid2_len)
2008 		memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2009 		       target->nfcid2_len);
2010 	else
2011 		skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
2012 	*next |= 2;
2013 
2014 	if (gb != NULL && gb_len > 0) {
2015 		skb_put_data(skb, gb, gb_len);
2016 		*next |= 4; /* We have some Gi */
2017 	} else {
2018 		*next = 0;
2019 	}
2020 
2021 	arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2022 	if (!arg) {
2023 		dev_kfree_skb(skb);
2024 		return -ENOMEM;
2025 	}
2026 
2027 	*arg = !comm_mode;
2028 
2029 	pn533_rf_field(dev->nfc_dev, 0);
2030 
2031 	rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2032 				  pn533_in_dep_link_up_complete, arg);
2033 
2034 	if (rc < 0) {
2035 		dev_kfree_skb(skb);
2036 		kfree(arg);
2037 	}
2038 
2039 	return rc;
2040 }
2041 
pn533_dep_link_down(struct nfc_dev * nfc_dev)2042 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2043 {
2044 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2045 
2046 	pn533_poll_reset_mod_list(dev);
2047 
2048 	if (dev->tgt_mode || dev->tgt_active_prot)
2049 		dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
2050 
2051 	dev->tgt_active_prot = 0;
2052 	dev->tgt_mode = 0;
2053 
2054 	skb_queue_purge(&dev->resp_q);
2055 
2056 	return 0;
2057 }
2058 
2059 struct pn533_data_exchange_arg {
2060 	data_exchange_cb_t cb;
2061 	void *cb_context;
2062 };
2063 
pn533_build_response(struct pn533 * dev)2064 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2065 {
2066 	struct sk_buff *skb, *tmp, *t;
2067 	unsigned int skb_len = 0, tmp_len = 0;
2068 
2069 	if (skb_queue_empty(&dev->resp_q))
2070 		return NULL;
2071 
2072 	if (skb_queue_len(&dev->resp_q) == 1) {
2073 		skb = skb_dequeue(&dev->resp_q);
2074 		goto out;
2075 	}
2076 
2077 	skb_queue_walk_safe(&dev->resp_q, tmp, t)
2078 		skb_len += tmp->len;
2079 
2080 	dev_dbg(dev->dev, "%s total length %d\n",
2081 		__func__, skb_len);
2082 
2083 	skb = alloc_skb(skb_len, GFP_KERNEL);
2084 	if (skb == NULL)
2085 		goto out;
2086 
2087 	skb_put(skb, skb_len);
2088 
2089 	skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2090 		memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2091 		tmp_len += tmp->len;
2092 	}
2093 
2094 out:
2095 	skb_queue_purge(&dev->resp_q);
2096 
2097 	return skb;
2098 }
2099 
pn533_data_exchange_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)2100 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2101 					struct sk_buff *resp)
2102 {
2103 	struct pn533_data_exchange_arg *arg = _arg;
2104 	struct sk_buff *skb;
2105 	int rc = 0;
2106 	u8 status, ret, mi;
2107 
2108 	if (IS_ERR(resp)) {
2109 		rc = PTR_ERR(resp);
2110 		goto _error;
2111 	}
2112 
2113 	status = resp->data[0];
2114 	ret = status & PN533_CMD_RET_MASK;
2115 	mi = status & PN533_CMD_MI_MASK;
2116 
2117 	skb_pull(resp, sizeof(status));
2118 
2119 	if (ret != PN533_CMD_RET_SUCCESS) {
2120 		nfc_err(dev->dev,
2121 			"Exchanging data failed (error 0x%x)\n", ret);
2122 		rc = -EIO;
2123 		goto error;
2124 	}
2125 
2126 	skb_queue_tail(&dev->resp_q, resp);
2127 
2128 	if (mi) {
2129 		dev->cmd_complete_mi_arg = arg;
2130 		queue_work(dev->wq, &dev->mi_rx_work);
2131 		return -EINPROGRESS;
2132 	}
2133 
2134 	/* Prepare for the next round */
2135 	if (skb_queue_len(&dev->fragment_skb) > 0) {
2136 		dev->cmd_complete_dep_arg = arg;
2137 		queue_work(dev->wq, &dev->mi_tx_work);
2138 
2139 		return -EINPROGRESS;
2140 	}
2141 
2142 	skb = pn533_build_response(dev);
2143 	if (!skb) {
2144 		rc = -ENOMEM;
2145 		goto error;
2146 	}
2147 
2148 	arg->cb(arg->cb_context, skb, 0);
2149 	kfree(arg);
2150 	return 0;
2151 
2152 error:
2153 	dev_kfree_skb(resp);
2154 _error:
2155 	skb_queue_purge(&dev->resp_q);
2156 	arg->cb(arg->cb_context, NULL, rc);
2157 	kfree(arg);
2158 	return rc;
2159 }
2160 
2161 /*
2162  * Receive an incoming pn533 frame. skb contains only header and payload.
2163  * If skb == NULL, it is a notification that the link below is dead.
2164  */
pn533_recv_frame(struct pn533 * dev,struct sk_buff * skb,int status)2165 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2166 {
2167 	if (!dev->cmd)
2168 		goto sched_wq;
2169 
2170 	dev->cmd->status = status;
2171 
2172 	if (status != 0) {
2173 		dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2174 		goto sched_wq;
2175 	}
2176 
2177 	if (skb == NULL) {
2178 		dev_err(dev->dev, "NULL Frame -> link is dead\n");
2179 		goto sched_wq;
2180 	}
2181 
2182 	if (pn533_rx_frame_is_ack(skb->data)) {
2183 		dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2184 		dev_kfree_skb(skb);
2185 		return;
2186 	}
2187 
2188 	print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2189 			     dev->ops->rx_frame_size(skb->data), false);
2190 
2191 	if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2192 		nfc_err(dev->dev, "Received an invalid frame\n");
2193 		dev->cmd->status = -EIO;
2194 	} else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2195 		nfc_err(dev->dev, "It it not the response to the last command\n");
2196 		dev->cmd->status = -EIO;
2197 	}
2198 
2199 	dev->cmd->resp = skb;
2200 
2201 sched_wq:
2202 	queue_work(dev->wq, &dev->cmd_complete_work);
2203 }
2204 EXPORT_SYMBOL(pn533_recv_frame);
2205 
2206 /* Split the Tx skb into small chunks */
pn533_fill_fragment_skbs(struct pn533 * dev,struct sk_buff * skb)2207 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2208 {
2209 	struct sk_buff *frag;
2210 	int  frag_size;
2211 
2212 	do {
2213 		/* Remaining size */
2214 		if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2215 			frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2216 		else
2217 			frag_size = skb->len;
2218 
2219 		/* Allocate and reserve */
2220 		frag = pn533_alloc_skb(dev, frag_size);
2221 		if (!frag) {
2222 			skb_queue_purge(&dev->fragment_skb);
2223 			return -ENOMEM;
2224 		}
2225 
2226 		if (!dev->tgt_mode) {
2227 			/* Reserve the TG/MI byte */
2228 			skb_reserve(frag, 1);
2229 
2230 			/* MI + TG */
2231 			if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2232 				*(u8 *)skb_push(frag, sizeof(u8)) =
2233 						(PN533_CMD_MI_MASK | 1);
2234 			else
2235 				*(u8 *)skb_push(frag, sizeof(u8)) =  1; /* TG */
2236 		}
2237 
2238 		skb_put_data(frag, skb->data, frag_size);
2239 
2240 		/* Reduce the size of incoming buffer */
2241 		skb_pull(skb, frag_size);
2242 
2243 		/* Add this to skb_queue */
2244 		skb_queue_tail(&dev->fragment_skb, frag);
2245 
2246 	} while (skb->len > 0);
2247 
2248 	dev_kfree_skb(skb);
2249 
2250 	return skb_queue_len(&dev->fragment_skb);
2251 }
2252 
pn533_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)2253 static int pn533_transceive(struct nfc_dev *nfc_dev,
2254 			    struct nfc_target *target, struct sk_buff *skb,
2255 			    data_exchange_cb_t cb, void *cb_context)
2256 {
2257 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2258 	struct pn533_data_exchange_arg *arg = NULL;
2259 	int rc;
2260 
2261 	if (!dev->tgt_active_prot) {
2262 		nfc_err(dev->dev,
2263 			"Can't exchange data if there is no active target\n");
2264 		rc = -EINVAL;
2265 		goto error;
2266 	}
2267 
2268 	arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2269 	if (!arg) {
2270 		rc = -ENOMEM;
2271 		goto error;
2272 	}
2273 
2274 	arg->cb = cb;
2275 	arg->cb_context = cb_context;
2276 
2277 	switch (dev->device_type) {
2278 	case PN533_DEVICE_PASORI:
2279 		if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2280 			rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2281 						   skb,
2282 						   pn533_data_exchange_complete,
2283 						   arg);
2284 
2285 			break;
2286 		}
2287 		fallthrough;
2288 	default:
2289 		/* jumbo frame ? */
2290 		if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2291 			rc = pn533_fill_fragment_skbs(dev, skb);
2292 			if (rc < 0)
2293 				goto error;
2294 
2295 			skb = skb_dequeue(&dev->fragment_skb);
2296 			if (!skb) {
2297 				rc = -EIO;
2298 				goto error;
2299 			}
2300 		} else {
2301 			*(u8 *)skb_push(skb, sizeof(u8)) =  1; /* TG */
2302 		}
2303 
2304 		rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2305 					   skb, pn533_data_exchange_complete,
2306 					   arg);
2307 
2308 		break;
2309 	}
2310 
2311 	if (rc < 0) /* rc from send_async */
2312 		goto error;
2313 
2314 	return 0;
2315 
2316 error:
2317 	kfree(arg);
2318 	dev_kfree_skb(skb);
2319 	return rc;
2320 }
2321 
pn533_tm_send_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)2322 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2323 				  struct sk_buff *resp)
2324 {
2325 	u8 status;
2326 
2327 	if (IS_ERR(resp))
2328 		return PTR_ERR(resp);
2329 
2330 	status = resp->data[0];
2331 
2332 	/* Prepare for the next round */
2333 	if (skb_queue_len(&dev->fragment_skb) > 0) {
2334 		queue_work(dev->wq, &dev->mi_tm_tx_work);
2335 		return -EINPROGRESS;
2336 	}
2337 	dev_kfree_skb(resp);
2338 
2339 	if (status != 0) {
2340 		nfc_tm_deactivated(dev->nfc_dev);
2341 
2342 		dev->tgt_mode = 0;
2343 
2344 		return 0;
2345 	}
2346 
2347 	queue_work(dev->wq, &dev->tg_work);
2348 
2349 	return 0;
2350 }
2351 
pn533_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)2352 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2353 {
2354 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2355 	int rc;
2356 
2357 	/* let's split in multiple chunks if size's too big */
2358 	if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2359 		rc = pn533_fill_fragment_skbs(dev, skb);
2360 		if (rc < 0)
2361 			goto error;
2362 
2363 		/* get the first skb */
2364 		skb = skb_dequeue(&dev->fragment_skb);
2365 		if (!skb) {
2366 			rc = -EIO;
2367 			goto error;
2368 		}
2369 
2370 		rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2371 						pn533_tm_send_complete, NULL);
2372 	} else {
2373 		/* Send th skb */
2374 		rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2375 						pn533_tm_send_complete, NULL);
2376 	}
2377 
2378 error:
2379 	if (rc < 0) {
2380 		dev_kfree_skb(skb);
2381 		skb_queue_purge(&dev->fragment_skb);
2382 	}
2383 
2384 	return rc;
2385 }
2386 
pn533_wq_mi_recv(struct work_struct * work)2387 static void pn533_wq_mi_recv(struct work_struct *work)
2388 {
2389 	struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2390 	struct sk_buff *skb;
2391 	int rc;
2392 
2393 	skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2394 	if (!skb)
2395 		goto error;
2396 
2397 	switch (dev->device_type) {
2398 	case PN533_DEVICE_PASORI:
2399 		if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2400 			rc = pn533_send_cmd_direct_async(dev,
2401 						PN533_CMD_IN_COMM_THRU,
2402 						skb,
2403 						pn533_data_exchange_complete,
2404 						 dev->cmd_complete_mi_arg);
2405 
2406 			break;
2407 		}
2408 		fallthrough;
2409 	default:
2410 		skb_put_u8(skb, 1); /*TG*/
2411 
2412 		rc = pn533_send_cmd_direct_async(dev,
2413 						 PN533_CMD_IN_DATA_EXCHANGE,
2414 						 skb,
2415 						 pn533_data_exchange_complete,
2416 						 dev->cmd_complete_mi_arg);
2417 
2418 		break;
2419 	}
2420 
2421 	if (rc == 0) /* success */
2422 		return;
2423 
2424 	nfc_err(dev->dev,
2425 		"Error %d when trying to perform data_exchange\n", rc);
2426 
2427 	dev_kfree_skb(skb);
2428 	kfree(dev->cmd_complete_mi_arg);
2429 
2430 error:
2431 	dev->phy_ops->send_ack(dev, GFP_KERNEL);
2432 	queue_work(dev->wq, &dev->cmd_work);
2433 }
2434 
pn533_wq_mi_send(struct work_struct * work)2435 static void pn533_wq_mi_send(struct work_struct *work)
2436 {
2437 	struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2438 	struct sk_buff *skb;
2439 	int rc;
2440 
2441 	/* Grab the first skb in the queue */
2442 	skb = skb_dequeue(&dev->fragment_skb);
2443 
2444 	if (skb == NULL) {	/* No more data */
2445 		/* Reset the queue for future use */
2446 		skb_queue_head_init(&dev->fragment_skb);
2447 		goto error;
2448 	}
2449 
2450 	switch (dev->device_type) {
2451 	case PN533_DEVICE_PASORI:
2452 		if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2453 			rc = -EIO;
2454 			break;
2455 		}
2456 
2457 		rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2458 						 skb,
2459 						 pn533_data_exchange_complete,
2460 						 dev->cmd_complete_dep_arg);
2461 
2462 		break;
2463 
2464 	default:
2465 		/* Still some fragments? */
2466 		rc = pn533_send_cmd_direct_async(dev,
2467 						 PN533_CMD_IN_DATA_EXCHANGE,
2468 						 skb,
2469 						 pn533_data_exchange_complete,
2470 						 dev->cmd_complete_dep_arg);
2471 
2472 		break;
2473 	}
2474 
2475 	if (rc == 0) /* success */
2476 		return;
2477 
2478 	nfc_err(dev->dev,
2479 		"Error %d when trying to perform data_exchange\n", rc);
2480 
2481 	dev_kfree_skb(skb);
2482 	kfree(dev->cmd_complete_dep_arg);
2483 
2484 error:
2485 	dev->phy_ops->send_ack(dev, GFP_KERNEL);
2486 	queue_work(dev->wq, &dev->cmd_work);
2487 }
2488 
pn533_set_configuration(struct pn533 * dev,u8 cfgitem,u8 * cfgdata,u8 cfgdata_len)2489 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2490 								u8 cfgdata_len)
2491 {
2492 	struct sk_buff *skb;
2493 	struct sk_buff *resp;
2494 	int skb_len;
2495 
2496 	skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2497 
2498 	skb = pn533_alloc_skb(dev, skb_len);
2499 	if (!skb)
2500 		return -ENOMEM;
2501 
2502 	skb_put_u8(skb, cfgitem);
2503 	skb_put_data(skb, cfgdata, cfgdata_len);
2504 
2505 	resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2506 	if (IS_ERR(resp))
2507 		return PTR_ERR(resp);
2508 
2509 	dev_kfree_skb(resp);
2510 	return 0;
2511 }
2512 
pn533_get_firmware_version(struct pn533 * dev,struct pn533_fw_version * fv)2513 static int pn533_get_firmware_version(struct pn533 *dev,
2514 				      struct pn533_fw_version *fv)
2515 {
2516 	struct sk_buff *skb;
2517 	struct sk_buff *resp;
2518 
2519 	skb = pn533_alloc_skb(dev, 0);
2520 	if (!skb)
2521 		return -ENOMEM;
2522 
2523 	resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2524 	if (IS_ERR(resp))
2525 		return PTR_ERR(resp);
2526 
2527 	fv->ic = resp->data[0];
2528 	fv->ver = resp->data[1];
2529 	fv->rev = resp->data[2];
2530 	fv->support = resp->data[3];
2531 
2532 	dev_kfree_skb(resp);
2533 	return 0;
2534 }
2535 
pn533_pasori_fw_reset(struct pn533 * dev)2536 static int pn533_pasori_fw_reset(struct pn533 *dev)
2537 {
2538 	struct sk_buff *skb;
2539 	struct sk_buff *resp;
2540 
2541 	skb = pn533_alloc_skb(dev, sizeof(u8));
2542 	if (!skb)
2543 		return -ENOMEM;
2544 
2545 	skb_put_u8(skb, 0x1);
2546 
2547 	resp = pn533_send_cmd_sync(dev, 0x18, skb);
2548 	if (IS_ERR(resp))
2549 		return PTR_ERR(resp);
2550 
2551 	dev_kfree_skb(resp);
2552 
2553 	return 0;
2554 }
2555 
pn533_rf_field(struct nfc_dev * nfc_dev,u8 rf)2556 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2557 {
2558 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2559 	u8 rf_field = !!rf;
2560 	int rc;
2561 
2562 	rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2563 
2564 	rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2565 				     (u8 *)&rf_field, 1);
2566 	if (rc) {
2567 		nfc_err(dev->dev, "Error on setting RF field\n");
2568 		return rc;
2569 	}
2570 
2571 	return 0;
2572 }
2573 
pn532_sam_configuration(struct nfc_dev * nfc_dev)2574 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2575 {
2576 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2577 	struct sk_buff *skb;
2578 	struct sk_buff *resp;
2579 
2580 	skb = pn533_alloc_skb(dev, 1);
2581 	if (!skb)
2582 		return -ENOMEM;
2583 
2584 	skb_put_u8(skb, 0x01);
2585 
2586 	resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2587 	if (IS_ERR(resp))
2588 		return PTR_ERR(resp);
2589 
2590 	dev_kfree_skb(resp);
2591 	return 0;
2592 }
2593 
pn533_dev_up(struct nfc_dev * nfc_dev)2594 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2595 {
2596 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2597 	int rc;
2598 
2599 	if (dev->phy_ops->dev_up) {
2600 		rc = dev->phy_ops->dev_up(dev);
2601 		if (rc)
2602 			return rc;
2603 	}
2604 
2605 	if ((dev->device_type == PN533_DEVICE_PN532) ||
2606 		(dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
2607 		rc = pn532_sam_configuration(nfc_dev);
2608 
2609 		if (rc)
2610 			return rc;
2611 	}
2612 
2613 	return pn533_rf_field(nfc_dev, 1);
2614 }
2615 
pn533_dev_down(struct nfc_dev * nfc_dev)2616 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2617 {
2618 	struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2619 	int ret;
2620 
2621 	ret = pn533_rf_field(nfc_dev, 0);
2622 	if (dev->phy_ops->dev_down && !ret)
2623 		ret = dev->phy_ops->dev_down(dev);
2624 
2625 	return ret;
2626 }
2627 
2628 static const struct nfc_ops pn533_nfc_ops = {
2629 	.dev_up = pn533_dev_up,
2630 	.dev_down = pn533_dev_down,
2631 	.dep_link_up = pn533_dep_link_up,
2632 	.dep_link_down = pn533_dep_link_down,
2633 	.start_poll = pn533_start_poll,
2634 	.stop_poll = pn533_stop_poll,
2635 	.activate_target = pn533_activate_target,
2636 	.deactivate_target = pn533_deactivate_target,
2637 	.im_transceive = pn533_transceive,
2638 	.tm_send = pn533_tm_send,
2639 };
2640 
pn533_setup(struct pn533 * dev)2641 static int pn533_setup(struct pn533 *dev)
2642 {
2643 	struct pn533_config_max_retries max_retries;
2644 	struct pn533_config_timing timing;
2645 	u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2646 	int rc;
2647 
2648 	switch (dev->device_type) {
2649 	case PN533_DEVICE_STD:
2650 	case PN533_DEVICE_PASORI:
2651 	case PN533_DEVICE_ACR122U:
2652 	case PN533_DEVICE_PN532:
2653 	case PN533_DEVICE_PN532_AUTOPOLL:
2654 		max_retries.mx_rty_atr = 0x2;
2655 		max_retries.mx_rty_psl = 0x1;
2656 		max_retries.mx_rty_passive_act =
2657 			PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2658 
2659 		timing.rfu = PN533_CONFIG_TIMING_102;
2660 		timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2661 		timing.dep_timeout = PN533_CONFIG_TIMING_204;
2662 
2663 		break;
2664 
2665 	default:
2666 		nfc_err(dev->dev, "Unknown device type %d\n",
2667 			dev->device_type);
2668 		return -EINVAL;
2669 	}
2670 
2671 	rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2672 				     (u8 *)&max_retries, sizeof(max_retries));
2673 	if (rc) {
2674 		nfc_err(dev->dev,
2675 			"Error on setting MAX_RETRIES config\n");
2676 		return rc;
2677 	}
2678 
2679 
2680 	rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2681 				     (u8 *)&timing, sizeof(timing));
2682 	if (rc) {
2683 		nfc_err(dev->dev, "Error on setting RF timings\n");
2684 		return rc;
2685 	}
2686 
2687 	switch (dev->device_type) {
2688 	case PN533_DEVICE_STD:
2689 	case PN533_DEVICE_PN532:
2690 	case PN533_DEVICE_PN532_AUTOPOLL:
2691 		break;
2692 
2693 	case PN533_DEVICE_PASORI:
2694 		pn533_pasori_fw_reset(dev);
2695 
2696 		rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2697 					     pasori_cfg, 3);
2698 		if (rc) {
2699 			nfc_err(dev->dev,
2700 				"Error while settings PASORI config\n");
2701 			return rc;
2702 		}
2703 
2704 		pn533_pasori_fw_reset(dev);
2705 
2706 		break;
2707 	}
2708 
2709 	return 0;
2710 }
2711 
pn533_finalize_setup(struct pn533 * dev)2712 int pn533_finalize_setup(struct pn533 *dev)
2713 {
2714 
2715 	struct pn533_fw_version fw_ver;
2716 	int rc;
2717 
2718 	memset(&fw_ver, 0, sizeof(fw_ver));
2719 
2720 	rc = pn533_get_firmware_version(dev, &fw_ver);
2721 	if (rc) {
2722 		nfc_err(dev->dev, "Unable to get FW version\n");
2723 		return rc;
2724 	}
2725 
2726 	nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2727 		fw_ver.ic, fw_ver.ver, fw_ver.rev);
2728 
2729 	rc = pn533_setup(dev);
2730 	if (rc)
2731 		return rc;
2732 
2733 	return 0;
2734 }
2735 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2736 
pn53x_common_init(u32 device_type,enum pn533_protocol_type protocol_type,void * phy,const struct pn533_phy_ops * phy_ops,struct pn533_frame_ops * fops,struct device * dev)2737 struct pn533 *pn53x_common_init(u32 device_type,
2738 				enum pn533_protocol_type protocol_type,
2739 				void *phy,
2740 				const struct pn533_phy_ops *phy_ops,
2741 				struct pn533_frame_ops *fops,
2742 				struct device *dev)
2743 {
2744 	struct pn533 *priv;
2745 
2746 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2747 	if (!priv)
2748 		return ERR_PTR(-ENOMEM);
2749 
2750 	priv->phy = phy;
2751 	priv->phy_ops = phy_ops;
2752 	priv->dev = dev;
2753 	if (fops != NULL)
2754 		priv->ops = fops;
2755 	else
2756 		priv->ops = &pn533_std_frame_ops;
2757 
2758 	priv->protocol_type = protocol_type;
2759 	priv->device_type = device_type;
2760 
2761 	mutex_init(&priv->cmd_lock);
2762 
2763 	INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2764 	INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2765 	INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2766 	INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2767 	INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2768 	INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2769 	INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2770 	INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2771 	INIT_WORK(&priv->rf_work, pn533_wq_rf);
2772 	priv->wq = alloc_ordered_workqueue("pn533", 0);
2773 	if (priv->wq == NULL)
2774 		goto error;
2775 
2776 	timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2777 
2778 	skb_queue_head_init(&priv->resp_q);
2779 	skb_queue_head_init(&priv->fragment_skb);
2780 
2781 	INIT_LIST_HEAD(&priv->cmd_queue);
2782 	return priv;
2783 
2784 error:
2785 	kfree(priv);
2786 	return ERR_PTR(-ENOMEM);
2787 }
2788 EXPORT_SYMBOL_GPL(pn53x_common_init);
2789 
pn53x_common_clean(struct pn533 * priv)2790 void pn53x_common_clean(struct pn533 *priv)
2791 {
2792 	struct pn533_cmd *cmd, *n;
2793 
2794 	/* delete the timer before cleanup the worker */
2795 	timer_shutdown_sync(&priv->listen_timer);
2796 
2797 	flush_delayed_work(&priv->poll_work);
2798 	destroy_workqueue(priv->wq);
2799 
2800 	skb_queue_purge(&priv->resp_q);
2801 
2802 	list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2803 		list_del(&cmd->queue);
2804 		kfree(cmd);
2805 	}
2806 
2807 	kfree(priv);
2808 }
2809 EXPORT_SYMBOL_GPL(pn53x_common_clean);
2810 
pn532_i2c_nfc_alloc(struct pn533 * priv,u32 protocols,struct device * parent)2811 int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
2812 			struct device *parent)
2813 {
2814 	priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2815 					   priv->ops->tx_header_len +
2816 					   PN533_CMD_DATAEXCH_HEAD_LEN,
2817 					   priv->ops->tx_tail_len);
2818 	if (!priv->nfc_dev)
2819 		return -ENOMEM;
2820 
2821 	nfc_set_parent_dev(priv->nfc_dev, parent);
2822 	nfc_set_drvdata(priv->nfc_dev, priv);
2823 	return 0;
2824 }
2825 EXPORT_SYMBOL_GPL(pn532_i2c_nfc_alloc);
2826 
pn53x_register_nfc(struct pn533 * priv,u32 protocols,struct device * parent)2827 int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
2828 			struct device *parent)
2829 {
2830 	int rc;
2831 
2832 	rc = pn532_i2c_nfc_alloc(priv, protocols, parent);
2833 	if (rc)
2834 		return rc;
2835 
2836 	rc = nfc_register_device(priv->nfc_dev);
2837 	if (rc)
2838 		nfc_free_device(priv->nfc_dev);
2839 
2840 	return rc;
2841 }
2842 EXPORT_SYMBOL_GPL(pn53x_register_nfc);
2843 
pn53x_unregister_nfc(struct pn533 * priv)2844 void pn53x_unregister_nfc(struct pn533 *priv)
2845 {
2846 	nfc_unregister_device(priv->nfc_dev);
2847 	nfc_free_device(priv->nfc_dev);
2848 }
2849 EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
2850 
2851 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2852 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2853 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2854 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2855 MODULE_VERSION(VERSION);
2856 MODULE_LICENSE("GPL");
2857