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; 187 188 189 /* PN533_TG_INIT_AS_TARGET */ 190 #define PN533_INIT_TARGET_PASSIVE 0x1 191 #define PN533_INIT_TARGET_DEP 0x2 192 193 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3 194 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1 195 #define PN533_INIT_TARGET_RESP_DEP 0x4 196 197 /* The rule: value(high byte) + value(low byte) + checksum = 0 */ 198 static inline u8 pn533_ext_checksum(u16 value) 199 { 200 return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1; 201 } 202 203 /* The rule: value + checksum = 0 */ 204 static inline u8 pn533_std_checksum(u8 value) 205 { 206 return ~value + 1; 207 } 208 209 /* The rule: sum(data elements) + checksum = 0 */ 210 static u8 pn533_std_data_checksum(u8 *data, int datalen) 211 { 212 u8 sum = 0; 213 int i; 214 215 for (i = 0; i < datalen; i++) 216 sum += data[i]; 217 218 return pn533_std_checksum(sum); 219 } 220 221 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code) 222 { 223 struct pn533_std_frame *frame = _frame; 224 225 frame->preamble = 0; 226 frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF); 227 PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT; 228 PN533_FRAME_CMD(frame) = cmd_code; 229 frame->datalen = 2; 230 } 231 232 static void pn533_std_tx_frame_finish(void *_frame) 233 { 234 struct pn533_std_frame *frame = _frame; 235 236 frame->datalen_checksum = pn533_std_checksum(frame->datalen); 237 238 PN533_STD_FRAME_CHECKSUM(frame) = 239 pn533_std_data_checksum(frame->data, frame->datalen); 240 241 PN533_STD_FRAME_POSTAMBLE(frame) = 0; 242 } 243 244 static void pn533_std_tx_update_payload_len(void *_frame, int len) 245 { 246 struct pn533_std_frame *frame = _frame; 247 248 frame->datalen += len; 249 } 250 251 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev) 252 { 253 u8 checksum; 254 struct pn533_std_frame *stdf = _frame; 255 256 if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF)) 257 return false; 258 259 if (likely(!PN533_STD_IS_EXTENDED(stdf))) { 260 /* Standard frame code */ 261 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN; 262 263 checksum = pn533_std_checksum(stdf->datalen); 264 if (checksum != stdf->datalen_checksum) 265 return false; 266 267 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen); 268 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf)) 269 return false; 270 } else { 271 /* Extended */ 272 struct pn533_ext_frame *eif = _frame; 273 274 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN; 275 276 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen)); 277 if (checksum != eif->datalen_checksum) 278 return false; 279 280 /* check data checksum */ 281 checksum = pn533_std_data_checksum(eif->data, 282 be16_to_cpu(eif->datalen)); 283 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif)) 284 return false; 285 } 286 287 return true; 288 } 289 290 bool pn533_rx_frame_is_ack(void *_frame) 291 { 292 struct pn533_std_frame *frame = _frame; 293 294 if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF)) 295 return false; 296 297 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF) 298 return false; 299 300 return true; 301 } 302 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack); 303 304 static inline int pn533_std_rx_frame_size(void *frame) 305 { 306 struct pn533_std_frame *f = frame; 307 308 /* check for Extended Information frame */ 309 if (PN533_STD_IS_EXTENDED(f)) { 310 struct pn533_ext_frame *eif = frame; 311 312 return sizeof(struct pn533_ext_frame) 313 + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN; 314 } 315 316 return sizeof(struct pn533_std_frame) + f->datalen + 317 PN533_STD_FRAME_TAIL_LEN; 318 } 319 320 static u8 pn533_std_get_cmd_code(void *frame) 321 { 322 struct pn533_std_frame *f = frame; 323 struct pn533_ext_frame *eif = frame; 324 325 if (PN533_STD_IS_EXTENDED(f)) 326 return PN533_FRAME_CMD(eif); 327 else 328 return PN533_FRAME_CMD(f); 329 } 330 331 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame) 332 { 333 return (dev->ops->get_cmd_code(frame) == 334 PN533_CMD_RESPONSE(dev->cmd->code)); 335 } 336 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response); 337 338 339 static struct pn533_frame_ops pn533_std_frame_ops = { 340 .tx_frame_init = pn533_std_tx_frame_init, 341 .tx_frame_finish = pn533_std_tx_frame_finish, 342 .tx_update_payload_len = pn533_std_tx_update_payload_len, 343 .tx_header_len = PN533_STD_FRAME_HEADER_LEN, 344 .tx_tail_len = PN533_STD_FRAME_TAIL_LEN, 345 346 .rx_is_frame_valid = pn533_std_rx_frame_is_valid, 347 .rx_frame_size = pn533_std_rx_frame_size, 348 .rx_header_len = PN533_STD_FRAME_HEADER_LEN, 349 .rx_tail_len = PN533_STD_FRAME_TAIL_LEN, 350 351 .max_payload_len = PN533_STD_FRAME_MAX_PAYLOAD_LEN, 352 .get_cmd_code = pn533_std_get_cmd_code, 353 }; 354 355 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code, 356 struct sk_buff *skb) 357 { 358 /* payload is already there, just update datalen */ 359 int payload_len = skb->len; 360 struct pn533_frame_ops *ops = dev->ops; 361 362 363 skb_push(skb, ops->tx_header_len); 364 skb_put(skb, ops->tx_tail_len); 365 366 ops->tx_frame_init(skb->data, cmd_code); 367 ops->tx_update_payload_len(skb->data, payload_len); 368 ops->tx_frame_finish(skb->data); 369 } 370 371 static int pn533_send_async_complete(struct pn533 *dev) 372 { 373 struct pn533_cmd *cmd = dev->cmd; 374 struct sk_buff *resp; 375 int status, rc = 0; 376 377 if (!cmd) { 378 dev_dbg(dev->dev, "%s: cmd not set\n", __func__); 379 goto done; 380 } 381 382 dev_kfree_skb(cmd->req); 383 384 status = cmd->status; 385 resp = cmd->resp; 386 387 if (status < 0) { 388 rc = cmd->complete_cb(dev, cmd->complete_cb_context, 389 ERR_PTR(status)); 390 dev_kfree_skb(resp); 391 goto done; 392 } 393 394 /* when no response is set we got interrupted */ 395 if (!resp) 396 resp = ERR_PTR(-EINTR); 397 398 if (!IS_ERR(resp)) { 399 skb_pull(resp, dev->ops->rx_header_len); 400 skb_trim(resp, resp->len - dev->ops->rx_tail_len); 401 } 402 403 rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp); 404 405 done: 406 kfree(cmd); 407 dev->cmd = NULL; 408 return rc; 409 } 410 411 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code, 412 struct sk_buff *req, 413 pn533_send_async_complete_t complete_cb, 414 void *complete_cb_context) 415 { 416 struct pn533_cmd *cmd; 417 int rc = 0; 418 419 dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code); 420 421 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 422 if (!cmd) 423 return -ENOMEM; 424 425 cmd->code = cmd_code; 426 cmd->req = req; 427 cmd->complete_cb = complete_cb; 428 cmd->complete_cb_context = complete_cb_context; 429 430 pn533_build_cmd_frame(dev, cmd_code, req); 431 432 mutex_lock(&dev->cmd_lock); 433 434 if (!dev->cmd_pending) { 435 dev->cmd = cmd; 436 rc = dev->phy_ops->send_frame(dev, req); 437 if (rc) { 438 dev->cmd = NULL; 439 goto error; 440 } 441 442 dev->cmd_pending = 1; 443 goto unlock; 444 } 445 446 dev_dbg(dev->dev, "%s Queueing command 0x%x\n", 447 __func__, cmd_code); 448 449 INIT_LIST_HEAD(&cmd->queue); 450 list_add_tail(&cmd->queue, &dev->cmd_queue); 451 452 goto unlock; 453 454 error: 455 kfree(cmd); 456 unlock: 457 mutex_unlock(&dev->cmd_lock); 458 return rc; 459 } 460 461 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code, 462 struct sk_buff *req, 463 pn533_send_async_complete_t complete_cb, 464 void *complete_cb_context) 465 { 466 int rc; 467 468 rc = __pn533_send_async(dev, cmd_code, req, complete_cb, 469 complete_cb_context); 470 471 return rc; 472 } 473 474 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code, 475 struct sk_buff *req, 476 pn533_send_async_complete_t complete_cb, 477 void *complete_cb_context) 478 { 479 int rc; 480 481 rc = __pn533_send_async(dev, cmd_code, req, complete_cb, 482 complete_cb_context); 483 484 return rc; 485 } 486 487 /* 488 * pn533_send_cmd_direct_async 489 * 490 * The function sends a piority cmd directly to the chip omitting the cmd 491 * queue. It's intended to be used by chaining mechanism of received responses 492 * where the host has to request every single chunk of data before scheduling 493 * next cmd from the queue. 494 */ 495 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code, 496 struct sk_buff *req, 497 pn533_send_async_complete_t complete_cb, 498 void *complete_cb_context) 499 { 500 struct pn533_cmd *cmd; 501 int rc; 502 503 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 504 if (!cmd) 505 return -ENOMEM; 506 507 cmd->code = cmd_code; 508 cmd->req = req; 509 cmd->complete_cb = complete_cb; 510 cmd->complete_cb_context = complete_cb_context; 511 512 pn533_build_cmd_frame(dev, cmd_code, req); 513 514 dev->cmd = cmd; 515 rc = dev->phy_ops->send_frame(dev, req); 516 if (rc < 0) { 517 dev->cmd = NULL; 518 kfree(cmd); 519 } 520 521 return rc; 522 } 523 524 static void pn533_wq_cmd_complete(struct work_struct *work) 525 { 526 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work); 527 int rc; 528 529 rc = pn533_send_async_complete(dev); 530 if (rc != -EINPROGRESS) 531 queue_work(dev->wq, &dev->cmd_work); 532 } 533 534 static void pn533_wq_cmd(struct work_struct *work) 535 { 536 struct pn533 *dev = container_of(work, struct pn533, cmd_work); 537 struct pn533_cmd *cmd; 538 int rc; 539 540 mutex_lock(&dev->cmd_lock); 541 542 if (list_empty(&dev->cmd_queue)) { 543 dev->cmd_pending = 0; 544 mutex_unlock(&dev->cmd_lock); 545 return; 546 } 547 548 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue); 549 550 list_del(&cmd->queue); 551 552 mutex_unlock(&dev->cmd_lock); 553 554 dev->cmd = cmd; 555 rc = dev->phy_ops->send_frame(dev, cmd->req); 556 if (rc < 0) { 557 dev->cmd = NULL; 558 dev_kfree_skb(cmd->req); 559 kfree(cmd); 560 return; 561 } 562 563 } 564 565 struct pn533_sync_cmd_response { 566 struct sk_buff *resp; 567 struct completion done; 568 }; 569 570 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg, 571 struct sk_buff *resp) 572 { 573 struct pn533_sync_cmd_response *arg = _arg; 574 575 arg->resp = resp; 576 complete(&arg->done); 577 578 return 0; 579 } 580 581 /* pn533_send_cmd_sync 582 * 583 * Please note the req parameter is freed inside the function to 584 * limit a number of return value interpretations by the caller. 585 * 586 * 1. negative in case of error during TX path -> req should be freed 587 * 588 * 2. negative in case of error during RX path -> req should not be freed 589 * as it's been already freed at the beginning of RX path by 590 * async_complete_cb. 591 * 592 * 3. valid pointer in case of succesfult RX path 593 * 594 * A caller has to check a return value with IS_ERR macro. If the test pass, 595 * the returned pointer is valid. 596 * 597 */ 598 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code, 599 struct sk_buff *req) 600 { 601 int rc; 602 struct pn533_sync_cmd_response arg; 603 604 init_completion(&arg.done); 605 606 rc = pn533_send_cmd_async(dev, cmd_code, req, 607 pn533_send_sync_complete, &arg); 608 if (rc) { 609 dev_kfree_skb(req); 610 return ERR_PTR(rc); 611 } 612 613 wait_for_completion(&arg.done); 614 615 return arg.resp; 616 } 617 618 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size) 619 { 620 struct sk_buff *skb; 621 622 skb = alloc_skb(dev->ops->tx_header_len + 623 size + 624 dev->ops->tx_tail_len, GFP_KERNEL); 625 626 if (skb) 627 skb_reserve(skb, dev->ops->tx_header_len); 628 629 return skb; 630 } 631 632 struct pn533_target_type_a { 633 __be16 sens_res; 634 u8 sel_res; 635 u8 nfcid_len; 636 u8 nfcid_data[]; 637 } __packed; 638 639 640 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6)) 641 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0)) 642 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8)) 643 644 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00 645 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C 646 647 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5) 648 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2) 649 650 #define PN533_TYPE_A_SEL_PROT_MIFARE 0 651 #define PN533_TYPE_A_SEL_PROT_ISO14443 1 652 #define PN533_TYPE_A_SEL_PROT_DEP 2 653 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3 654 655 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a, 656 int target_data_len) 657 { 658 u8 ssd; 659 u8 platconf; 660 661 if (target_data_len < sizeof(struct pn533_target_type_a)) 662 return false; 663 664 /* 665 * The length check of nfcid[] and ats[] are not being performed because 666 * the values are not being used 667 */ 668 669 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */ 670 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res); 671 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res); 672 673 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL && 674 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) || 675 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL && 676 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL)) 677 return false; 678 679 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */ 680 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0) 681 return false; 682 683 return true; 684 } 685 686 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data, 687 int tgt_data_len) 688 { 689 struct pn533_target_type_a *tgt_type_a; 690 691 tgt_type_a = (struct pn533_target_type_a *)tgt_data; 692 693 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len)) 694 return -EPROTO; 695 696 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) { 697 case PN533_TYPE_A_SEL_PROT_MIFARE: 698 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK; 699 break; 700 case PN533_TYPE_A_SEL_PROT_ISO14443: 701 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK; 702 break; 703 case PN533_TYPE_A_SEL_PROT_DEP: 704 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK; 705 break; 706 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP: 707 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK | 708 NFC_PROTO_NFC_DEP_MASK; 709 break; 710 } 711 712 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res); 713 nfc_tgt->sel_res = tgt_type_a->sel_res; 714 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len; 715 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len); 716 717 return 0; 718 } 719 720 struct pn533_target_felica { 721 u8 pol_res; 722 u8 opcode; 723 u8 nfcid2[NFC_NFCID2_MAXSIZE]; 724 u8 pad[8]; 725 /* optional */ 726 u8 syst_code[]; 727 } __packed; 728 729 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01 730 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE 731 732 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica, 733 int target_data_len) 734 { 735 if (target_data_len < sizeof(struct pn533_target_felica)) 736 return false; 737 738 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES) 739 return false; 740 741 return true; 742 } 743 744 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data, 745 int tgt_data_len) 746 { 747 struct pn533_target_felica *tgt_felica; 748 749 tgt_felica = (struct pn533_target_felica *)tgt_data; 750 751 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len)) 752 return -EPROTO; 753 754 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) && 755 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2)) 756 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK; 757 else 758 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK; 759 760 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9); 761 nfc_tgt->sensf_res_len = 9; 762 763 memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE); 764 nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE; 765 766 return 0; 767 } 768 769 struct pn533_target_jewel { 770 __be16 sens_res; 771 u8 jewelid[4]; 772 } __packed; 773 774 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel, 775 int target_data_len) 776 { 777 u8 ssd; 778 u8 platconf; 779 780 if (target_data_len < sizeof(struct pn533_target_jewel)) 781 return false; 782 783 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */ 784 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res); 785 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res); 786 787 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL && 788 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) || 789 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL && 790 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL)) 791 return false; 792 793 return true; 794 } 795 796 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data, 797 int tgt_data_len) 798 { 799 struct pn533_target_jewel *tgt_jewel; 800 801 tgt_jewel = (struct pn533_target_jewel *)tgt_data; 802 803 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len)) 804 return -EPROTO; 805 806 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK; 807 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res); 808 nfc_tgt->nfcid1_len = 4; 809 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len); 810 811 return 0; 812 } 813 814 struct pn533_type_b_prot_info { 815 u8 bitrate; 816 u8 fsci_type; 817 u8 fwi_adc_fo; 818 } __packed; 819 820 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4) 821 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0) 822 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8 823 824 struct pn533_type_b_sens_res { 825 u8 opcode; 826 u8 nfcid[4]; 827 u8 appdata[4]; 828 struct pn533_type_b_prot_info prot_info; 829 } __packed; 830 831 #define PN533_TYPE_B_OPC_SENSB_RES 0x50 832 833 struct pn533_target_type_b { 834 struct pn533_type_b_sens_res sensb_res; 835 u8 attrib_res_len; 836 u8 attrib_res[]; 837 } __packed; 838 839 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b, 840 int target_data_len) 841 { 842 if (target_data_len < sizeof(struct pn533_target_type_b)) 843 return false; 844 845 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES) 846 return false; 847 848 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) & 849 PN533_TYPE_B_PROT_TYPE_RFU_MASK) 850 return false; 851 852 return true; 853 } 854 855 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data, 856 int tgt_data_len) 857 { 858 struct pn533_target_type_b *tgt_type_b; 859 860 tgt_type_b = (struct pn533_target_type_b *)tgt_data; 861 862 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len)) 863 return -EPROTO; 864 865 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK; 866 867 return 0; 868 } 869 870 static void pn533_poll_reset_mod_list(struct pn533 *dev); 871 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata, 872 int tgdata_len) 873 { 874 struct nfc_target nfc_tgt; 875 int rc; 876 877 dev_dbg(dev->dev, "%s: modulation=%d\n", 878 __func__, dev->poll_mod_curr); 879 880 if (tg != 1) 881 return -EPROTO; 882 883 memset(&nfc_tgt, 0, sizeof(struct nfc_target)); 884 885 switch (dev->poll_mod_curr) { 886 case PN533_POLL_MOD_106KBPS_A: 887 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len); 888 break; 889 case PN533_POLL_MOD_212KBPS_FELICA: 890 case PN533_POLL_MOD_424KBPS_FELICA: 891 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len); 892 break; 893 case PN533_POLL_MOD_106KBPS_JEWEL: 894 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len); 895 break; 896 case PN533_POLL_MOD_847KBPS_B: 897 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len); 898 break; 899 default: 900 nfc_err(dev->dev, 901 "Unknown current poll modulation\n"); 902 return -EPROTO; 903 } 904 905 if (rc) 906 return rc; 907 908 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) { 909 dev_dbg(dev->dev, 910 "The Tg found doesn't have the desired protocol\n"); 911 return -EAGAIN; 912 } 913 914 dev_dbg(dev->dev, 915 "Target found - supported protocols: 0x%x\n", 916 nfc_tgt.supported_protocols); 917 918 dev->tgt_available_prots = nfc_tgt.supported_protocols; 919 920 pn533_poll_reset_mod_list(dev); 921 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1); 922 923 return 0; 924 } 925 926 static inline void pn533_poll_next_mod(struct pn533 *dev) 927 { 928 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count; 929 } 930 931 static void pn533_poll_reset_mod_list(struct pn533 *dev) 932 { 933 dev->poll_mod_count = 0; 934 } 935 936 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index) 937 { 938 dev->poll_mod_active[dev->poll_mod_count] = 939 (struct pn533_poll_modulations *)&poll_mod[mod_index]; 940 dev->poll_mod_count++; 941 } 942 943 static void pn533_poll_create_mod_list(struct pn533 *dev, 944 u32 im_protocols, u32 tm_protocols) 945 { 946 pn533_poll_reset_mod_list(dev); 947 948 if ((im_protocols & NFC_PROTO_MIFARE_MASK) || 949 (im_protocols & NFC_PROTO_ISO14443_MASK) || 950 (im_protocols & NFC_PROTO_NFC_DEP_MASK)) 951 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A); 952 953 if (im_protocols & NFC_PROTO_FELICA_MASK || 954 im_protocols & NFC_PROTO_NFC_DEP_MASK) { 955 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA); 956 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA); 957 } 958 959 if (im_protocols & NFC_PROTO_JEWEL_MASK) 960 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL); 961 962 if (im_protocols & NFC_PROTO_ISO14443_B_MASK) 963 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B); 964 965 if (tm_protocols) 966 pn533_poll_add_mod(dev, PN533_LISTEN_MOD); 967 } 968 969 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp) 970 { 971 u8 nbtg, tg, *tgdata; 972 int rc, tgdata_len; 973 974 /* Toggle the DEP polling */ 975 if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) 976 dev->poll_dep = 1; 977 978 nbtg = resp->data[0]; 979 tg = resp->data[1]; 980 tgdata = &resp->data[2]; 981 tgdata_len = resp->len - 2; /* nbtg + tg */ 982 983 if (nbtg) { 984 rc = pn533_target_found(dev, tg, tgdata, tgdata_len); 985 986 /* We must stop the poll after a valid target found */ 987 if (rc == 0) 988 return 0; 989 } 990 991 return -EAGAIN; 992 } 993 994 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev) 995 { 996 struct sk_buff *skb; 997 u8 *felica, *nfcid3; 998 999 u8 *gbytes = dev->gb; 1000 size_t gbytes_len = dev->gb_len; 1001 1002 u8 felica_params[18] = {0x1, 0xfe, /* DEP */ 1003 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */ 1004 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 1005 0xff, 0xff}; /* System code */ 1006 1007 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */ 1008 0x0, 0x0, 0x0, 1009 0x40}; /* SEL_RES for DEP */ 1010 1011 unsigned int skb_len = 36 + /* 1012 * mode (1), mifare (6), 1013 * felica (18), nfcid3 (10), gb_len (1) 1014 */ 1015 gbytes_len + 1016 1; /* len Tk*/ 1017 1018 skb = pn533_alloc_skb(dev, skb_len); 1019 if (!skb) 1020 return NULL; 1021 1022 /* DEP support only */ 1023 skb_put_u8(skb, PN533_INIT_TARGET_DEP); 1024 1025 /* MIFARE params */ 1026 skb_put_data(skb, mifare_params, 6); 1027 1028 /* Felica params */ 1029 felica = skb_put_data(skb, felica_params, 18); 1030 get_random_bytes(felica + 2, 6); 1031 1032 /* NFCID3 */ 1033 nfcid3 = skb_put_zero(skb, 10); 1034 memcpy(nfcid3, felica, 8); 1035 1036 /* General bytes */ 1037 skb_put_u8(skb, gbytes_len); 1038 1039 skb_put_data(skb, gbytes, gbytes_len); 1040 1041 /* Len Tk */ 1042 skb_put_u8(skb, 0); 1043 1044 return skb; 1045 } 1046 1047 static void pn533_wq_tm_mi_recv(struct work_struct *work); 1048 static struct sk_buff *pn533_build_response(struct pn533 *dev); 1049 1050 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg, 1051 struct sk_buff *resp) 1052 { 1053 struct sk_buff *skb; 1054 u8 status, ret, mi; 1055 int rc; 1056 1057 dev_dbg(dev->dev, "%s\n", __func__); 1058 1059 if (IS_ERR(resp)) { 1060 skb_queue_purge(&dev->resp_q); 1061 return PTR_ERR(resp); 1062 } 1063 1064 status = resp->data[0]; 1065 1066 ret = status & PN533_CMD_RET_MASK; 1067 mi = status & PN533_CMD_MI_MASK; 1068 1069 skb_pull(resp, sizeof(status)); 1070 1071 if (ret != PN533_CMD_RET_SUCCESS) { 1072 rc = -EIO; 1073 goto error; 1074 } 1075 1076 skb_queue_tail(&dev->resp_q, resp); 1077 1078 if (mi) { 1079 queue_work(dev->wq, &dev->mi_tm_rx_work); 1080 return -EINPROGRESS; 1081 } 1082 1083 skb = pn533_build_response(dev); 1084 if (!skb) { 1085 rc = -EIO; 1086 goto error; 1087 } 1088 1089 return nfc_tm_data_received(dev->nfc_dev, skb); 1090 1091 error: 1092 nfc_tm_deactivated(dev->nfc_dev); 1093 dev->tgt_mode = 0; 1094 skb_queue_purge(&dev->resp_q); 1095 dev_kfree_skb(resp); 1096 1097 return rc; 1098 } 1099 1100 static void pn533_wq_tm_mi_recv(struct work_struct *work) 1101 { 1102 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work); 1103 struct sk_buff *skb; 1104 int rc; 1105 1106 dev_dbg(dev->dev, "%s\n", __func__); 1107 1108 skb = pn533_alloc_skb(dev, 0); 1109 if (!skb) 1110 return; 1111 1112 rc = pn533_send_cmd_direct_async(dev, 1113 PN533_CMD_TG_GET_DATA, 1114 skb, 1115 pn533_tm_get_data_complete, 1116 NULL); 1117 1118 if (rc < 0) 1119 dev_kfree_skb(skb); 1120 } 1121 1122 static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 1123 struct sk_buff *resp); 1124 static void pn533_wq_tm_mi_send(struct work_struct *work) 1125 { 1126 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work); 1127 struct sk_buff *skb; 1128 int rc; 1129 1130 dev_dbg(dev->dev, "%s\n", __func__); 1131 1132 /* Grab the first skb in the queue */ 1133 skb = skb_dequeue(&dev->fragment_skb); 1134 if (skb == NULL) { /* No more data */ 1135 /* Reset the queue for future use */ 1136 skb_queue_head_init(&dev->fragment_skb); 1137 goto error; 1138 } 1139 1140 /* last entry - remove MI bit */ 1141 if (skb_queue_len(&dev->fragment_skb) == 0) { 1142 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA, 1143 skb, pn533_tm_send_complete, NULL); 1144 } else 1145 rc = pn533_send_cmd_direct_async(dev, 1146 PN533_CMD_TG_SET_META_DATA, 1147 skb, pn533_tm_send_complete, NULL); 1148 1149 if (rc == 0) /* success */ 1150 return; 1151 1152 dev_err(dev->dev, 1153 "Error %d when trying to perform set meta data_exchange", rc); 1154 1155 dev_kfree_skb(skb); 1156 1157 error: 1158 dev->phy_ops->send_ack(dev, GFP_KERNEL); 1159 queue_work(dev->wq, &dev->cmd_work); 1160 } 1161 1162 static void pn533_wq_tg_get_data(struct work_struct *work) 1163 { 1164 struct pn533 *dev = container_of(work, struct pn533, tg_work); 1165 struct sk_buff *skb; 1166 int rc; 1167 1168 dev_dbg(dev->dev, "%s\n", __func__); 1169 1170 skb = pn533_alloc_skb(dev, 0); 1171 if (!skb) 1172 return; 1173 1174 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb, 1175 pn533_tm_get_data_complete, NULL); 1176 1177 if (rc < 0) 1178 dev_kfree_skb(skb); 1179 } 1180 1181 #define ATR_REQ_GB_OFFSET 17 1182 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp) 1183 { 1184 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb; 1185 size_t gb_len; 1186 int rc; 1187 1188 dev_dbg(dev->dev, "%s\n", __func__); 1189 1190 if (resp->len < ATR_REQ_GB_OFFSET + 1) 1191 return -EINVAL; 1192 1193 mode = resp->data[0]; 1194 cmd = &resp->data[1]; 1195 1196 dev_dbg(dev->dev, "Target mode 0x%x len %d\n", 1197 mode, resp->len); 1198 1199 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) == 1200 PN533_INIT_TARGET_RESP_ACTIVE) 1201 comm_mode = NFC_COMM_ACTIVE; 1202 1203 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */ 1204 return -EOPNOTSUPP; 1205 1206 gb = cmd + ATR_REQ_GB_OFFSET; 1207 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1); 1208 1209 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, 1210 comm_mode, gb, gb_len); 1211 if (rc < 0) { 1212 nfc_err(dev->dev, 1213 "Error when signaling target activation\n"); 1214 return rc; 1215 } 1216 1217 dev->tgt_mode = 1; 1218 queue_work(dev->wq, &dev->tg_work); 1219 1220 return 0; 1221 } 1222 1223 static void pn533_listen_mode_timer(struct timer_list *t) 1224 { 1225 struct pn533 *dev = from_timer(dev, t, listen_timer); 1226 1227 dev_dbg(dev->dev, "Listen mode timeout\n"); 1228 1229 dev->cancel_listen = 1; 1230 1231 pn533_poll_next_mod(dev); 1232 1233 queue_delayed_work(dev->wq, &dev->poll_work, 1234 msecs_to_jiffies(PN533_POLL_INTERVAL)); 1235 } 1236 1237 static int pn533_rf_complete(struct pn533 *dev, void *arg, 1238 struct sk_buff *resp) 1239 { 1240 int rc = 0; 1241 1242 dev_dbg(dev->dev, "%s\n", __func__); 1243 1244 if (IS_ERR(resp)) { 1245 rc = PTR_ERR(resp); 1246 1247 nfc_err(dev->dev, "RF setting error %d\n", rc); 1248 1249 return rc; 1250 } 1251 1252 queue_delayed_work(dev->wq, &dev->poll_work, 1253 msecs_to_jiffies(PN533_POLL_INTERVAL)); 1254 1255 dev_kfree_skb(resp); 1256 return rc; 1257 } 1258 1259 static void pn533_wq_rf(struct work_struct *work) 1260 { 1261 struct pn533 *dev = container_of(work, struct pn533, rf_work); 1262 struct sk_buff *skb; 1263 int rc; 1264 1265 dev_dbg(dev->dev, "%s\n", __func__); 1266 1267 skb = pn533_alloc_skb(dev, 2); 1268 if (!skb) 1269 return; 1270 1271 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD); 1272 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA); 1273 1274 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb, 1275 pn533_rf_complete, NULL); 1276 if (rc < 0) { 1277 dev_kfree_skb(skb); 1278 nfc_err(dev->dev, "RF setting error %d\n", rc); 1279 } 1280 } 1281 1282 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg, 1283 struct sk_buff *resp) 1284 { 1285 struct pn533_cmd_jump_dep_response *rsp; 1286 struct nfc_target nfc_target; 1287 u8 target_gt_len; 1288 int rc; 1289 1290 if (IS_ERR(resp)) 1291 return PTR_ERR(resp); 1292 1293 rsp = (struct pn533_cmd_jump_dep_response *)resp->data; 1294 1295 rc = rsp->status & PN533_CMD_RET_MASK; 1296 if (rc != PN533_CMD_RET_SUCCESS) { 1297 /* Not target found, turn radio off */ 1298 queue_work(dev->wq, &dev->rf_work); 1299 1300 dev_kfree_skb(resp); 1301 return 0; 1302 } 1303 1304 dev_dbg(dev->dev, "Creating new target"); 1305 1306 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; 1307 nfc_target.nfcid1_len = 10; 1308 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len); 1309 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); 1310 if (rc) 1311 goto error; 1312 1313 dev->tgt_available_prots = 0; 1314 dev->tgt_active_prot = NFC_PROTO_NFC_DEP; 1315 1316 /* ATR_RES general bytes are located at offset 17 */ 1317 target_gt_len = resp->len - 17; 1318 rc = nfc_set_remote_general_bytes(dev->nfc_dev, 1319 rsp->gt, target_gt_len); 1320 if (!rc) { 1321 rc = nfc_dep_link_is_up(dev->nfc_dev, 1322 dev->nfc_dev->targets[0].idx, 1323 0, NFC_RF_INITIATOR); 1324 1325 if (!rc) 1326 pn533_poll_reset_mod_list(dev); 1327 } 1328 error: 1329 dev_kfree_skb(resp); 1330 return rc; 1331 } 1332 1333 #define PASSIVE_DATA_LEN 5 1334 static int pn533_poll_dep(struct nfc_dev *nfc_dev) 1335 { 1336 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1337 struct sk_buff *skb; 1338 int rc, skb_len; 1339 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE]; 1340 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3}; 1341 1342 dev_dbg(dev->dev, "%s", __func__); 1343 1344 if (!dev->gb) { 1345 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len); 1346 1347 if (!dev->gb || !dev->gb_len) { 1348 dev->poll_dep = 0; 1349 queue_work(dev->wq, &dev->rf_work); 1350 } 1351 } 1352 1353 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */ 1354 skb_len += PASSIVE_DATA_LEN; 1355 1356 /* NFCID3 */ 1357 skb_len += NFC_NFCID3_MAXSIZE; 1358 nfcid3[0] = 0x1; 1359 nfcid3[1] = 0xfe; 1360 get_random_bytes(nfcid3 + 2, 6); 1361 1362 skb = pn533_alloc_skb(dev, skb_len); 1363 if (!skb) 1364 return -ENOMEM; 1365 1366 skb_put_u8(skb, 0x01); /* Active */ 1367 skb_put_u8(skb, 0x02); /* 424 kbps */ 1368 1369 next = skb_put(skb, 1); /* Next */ 1370 *next = 0; 1371 1372 /* Copy passive data */ 1373 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN); 1374 *next |= 1; 1375 1376 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */ 1377 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE); 1378 *next |= 2; 1379 1380 skb_put_data(skb, dev->gb, dev->gb_len); 1381 *next |= 4; /* We have some Gi */ 1382 1383 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb, 1384 pn533_poll_dep_complete, NULL); 1385 1386 if (rc < 0) 1387 dev_kfree_skb(skb); 1388 1389 return rc; 1390 } 1391 1392 static int pn533_poll_complete(struct pn533 *dev, void *arg, 1393 struct sk_buff *resp) 1394 { 1395 struct pn533_poll_modulations *cur_mod; 1396 int rc; 1397 1398 dev_dbg(dev->dev, "%s\n", __func__); 1399 1400 if (IS_ERR(resp)) { 1401 rc = PTR_ERR(resp); 1402 1403 nfc_err(dev->dev, "%s Poll complete error %d\n", 1404 __func__, rc); 1405 1406 if (rc == -ENOENT) { 1407 if (dev->poll_mod_count != 0) 1408 return rc; 1409 goto stop_poll; 1410 } else if (rc < 0) { 1411 nfc_err(dev->dev, 1412 "Error %d when running poll\n", rc); 1413 goto stop_poll; 1414 } 1415 } 1416 1417 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1418 1419 if (cur_mod->len == 0) { /* Target mode */ 1420 del_timer(&dev->listen_timer); 1421 rc = pn533_init_target_complete(dev, resp); 1422 goto done; 1423 } 1424 1425 /* Initiator mode */ 1426 rc = pn533_start_poll_complete(dev, resp); 1427 if (!rc) 1428 goto done; 1429 1430 if (!dev->poll_mod_count) { 1431 dev_dbg(dev->dev, "Polling has been stopped\n"); 1432 goto done; 1433 } 1434 1435 pn533_poll_next_mod(dev); 1436 /* Not target found, turn radio off */ 1437 queue_work(dev->wq, &dev->rf_work); 1438 1439 done: 1440 dev_kfree_skb(resp); 1441 return rc; 1442 1443 stop_poll: 1444 nfc_err(dev->dev, "Polling operation has been stopped\n"); 1445 1446 pn533_poll_reset_mod_list(dev); 1447 dev->poll_protocols = 0; 1448 return rc; 1449 } 1450 1451 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev, 1452 struct pn533_poll_modulations *mod) 1453 { 1454 struct sk_buff *skb; 1455 1456 skb = pn533_alloc_skb(dev, mod->len); 1457 if (!skb) 1458 return NULL; 1459 1460 skb_put_data(skb, &mod->data, mod->len); 1461 1462 return skb; 1463 } 1464 1465 static int pn533_send_poll_frame(struct pn533 *dev) 1466 { 1467 struct pn533_poll_modulations *mod; 1468 struct sk_buff *skb; 1469 int rc; 1470 u8 cmd_code; 1471 1472 mod = dev->poll_mod_active[dev->poll_mod_curr]; 1473 1474 dev_dbg(dev->dev, "%s mod len %d\n", 1475 __func__, mod->len); 1476 1477 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) { 1478 dev->poll_dep = 0; 1479 return pn533_poll_dep(dev->nfc_dev); 1480 } 1481 1482 if (mod->len == 0) { /* Listen mode */ 1483 cmd_code = PN533_CMD_TG_INIT_AS_TARGET; 1484 skb = pn533_alloc_poll_tg_frame(dev); 1485 } else { /* Polling mode */ 1486 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET; 1487 skb = pn533_alloc_poll_in_frame(dev, mod); 1488 } 1489 1490 if (!skb) { 1491 nfc_err(dev->dev, "Failed to allocate skb\n"); 1492 return -ENOMEM; 1493 } 1494 1495 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete, 1496 NULL); 1497 if (rc < 0) { 1498 dev_kfree_skb(skb); 1499 nfc_err(dev->dev, "Polling loop error %d\n", rc); 1500 } 1501 1502 return rc; 1503 } 1504 1505 static void pn533_wq_poll(struct work_struct *work) 1506 { 1507 struct pn533 *dev = container_of(work, struct pn533, poll_work.work); 1508 struct pn533_poll_modulations *cur_mod; 1509 int rc; 1510 1511 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1512 1513 dev_dbg(dev->dev, 1514 "%s cancel_listen %d modulation len %d\n", 1515 __func__, dev->cancel_listen, cur_mod->len); 1516 1517 if (dev->cancel_listen == 1) { 1518 dev->cancel_listen = 0; 1519 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC); 1520 } 1521 1522 rc = pn533_send_poll_frame(dev); 1523 if (rc) 1524 return; 1525 1526 if (cur_mod->len == 0 && dev->poll_mod_count > 1) 1527 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ); 1528 } 1529 1530 static int pn533_start_poll(struct nfc_dev *nfc_dev, 1531 u32 im_protocols, u32 tm_protocols) 1532 { 1533 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1534 struct pn533_poll_modulations *cur_mod; 1535 u8 rand_mod; 1536 int rc; 1537 1538 dev_dbg(dev->dev, 1539 "%s: im protocols 0x%x tm protocols 0x%x\n", 1540 __func__, im_protocols, tm_protocols); 1541 1542 if (dev->tgt_active_prot) { 1543 nfc_err(dev->dev, 1544 "Cannot poll with a target already activated\n"); 1545 return -EBUSY; 1546 } 1547 1548 if (dev->tgt_mode) { 1549 nfc_err(dev->dev, 1550 "Cannot poll while already being activated\n"); 1551 return -EBUSY; 1552 } 1553 1554 if (tm_protocols) { 1555 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len); 1556 if (dev->gb == NULL) 1557 tm_protocols = 0; 1558 } 1559 1560 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols); 1561 dev->poll_protocols = im_protocols; 1562 dev->listen_protocols = tm_protocols; 1563 1564 /* Do not always start polling from the same modulation */ 1565 get_random_bytes(&rand_mod, sizeof(rand_mod)); 1566 rand_mod %= dev->poll_mod_count; 1567 dev->poll_mod_curr = rand_mod; 1568 1569 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1570 1571 rc = pn533_send_poll_frame(dev); 1572 1573 /* Start listen timer */ 1574 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1) 1575 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ); 1576 1577 return rc; 1578 } 1579 1580 static void pn533_stop_poll(struct nfc_dev *nfc_dev) 1581 { 1582 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1583 1584 del_timer(&dev->listen_timer); 1585 1586 if (!dev->poll_mod_count) { 1587 dev_dbg(dev->dev, 1588 "Polling operation was not running\n"); 1589 return; 1590 } 1591 1592 dev->phy_ops->abort_cmd(dev, GFP_KERNEL); 1593 flush_delayed_work(&dev->poll_work); 1594 pn533_poll_reset_mod_list(dev); 1595 } 1596 1597 static int pn533_activate_target_nfcdep(struct pn533 *dev) 1598 { 1599 struct pn533_cmd_activate_response *rsp; 1600 u16 gt_len; 1601 int rc; 1602 struct sk_buff *skb; 1603 struct sk_buff *resp; 1604 1605 dev_dbg(dev->dev, "%s\n", __func__); 1606 1607 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/ 1608 if (!skb) 1609 return -ENOMEM; 1610 1611 skb_put_u8(skb, 1); /* TG */ 1612 skb_put_u8(skb, 0); /* Next */ 1613 1614 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb); 1615 if (IS_ERR(resp)) 1616 return PTR_ERR(resp); 1617 1618 rsp = (struct pn533_cmd_activate_response *)resp->data; 1619 rc = rsp->status & PN533_CMD_RET_MASK; 1620 if (rc != PN533_CMD_RET_SUCCESS) { 1621 nfc_err(dev->dev, 1622 "Target activation failed (error 0x%x)\n", rc); 1623 dev_kfree_skb(resp); 1624 return -EIO; 1625 } 1626 1627 /* ATR_RES general bytes are located at offset 16 */ 1628 gt_len = resp->len - 16; 1629 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len); 1630 1631 dev_kfree_skb(resp); 1632 return rc; 1633 } 1634 1635 static int pn533_activate_target(struct nfc_dev *nfc_dev, 1636 struct nfc_target *target, u32 protocol) 1637 { 1638 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1639 int rc; 1640 1641 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol); 1642 1643 if (dev->poll_mod_count) { 1644 nfc_err(dev->dev, 1645 "Cannot activate while polling\n"); 1646 return -EBUSY; 1647 } 1648 1649 if (dev->tgt_active_prot) { 1650 nfc_err(dev->dev, 1651 "There is already an active target\n"); 1652 return -EBUSY; 1653 } 1654 1655 if (!dev->tgt_available_prots) { 1656 nfc_err(dev->dev, 1657 "There is no available target to activate\n"); 1658 return -EINVAL; 1659 } 1660 1661 if (!(dev->tgt_available_prots & (1 << protocol))) { 1662 nfc_err(dev->dev, 1663 "Target doesn't support requested proto %u\n", 1664 protocol); 1665 return -EINVAL; 1666 } 1667 1668 if (protocol == NFC_PROTO_NFC_DEP) { 1669 rc = pn533_activate_target_nfcdep(dev); 1670 if (rc) { 1671 nfc_err(dev->dev, 1672 "Activating target with DEP failed %d\n", rc); 1673 return rc; 1674 } 1675 } 1676 1677 dev->tgt_active_prot = protocol; 1678 dev->tgt_available_prots = 0; 1679 1680 return 0; 1681 } 1682 1683 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg, 1684 struct sk_buff *resp) 1685 { 1686 int rc = 0; 1687 1688 dev_dbg(dev->dev, "%s\n", __func__); 1689 1690 if (IS_ERR(resp)) { 1691 rc = PTR_ERR(resp); 1692 1693 nfc_err(dev->dev, "Target release error %d\n", rc); 1694 1695 return rc; 1696 } 1697 1698 rc = resp->data[0] & PN533_CMD_RET_MASK; 1699 if (rc != PN533_CMD_RET_SUCCESS) 1700 nfc_err(dev->dev, 1701 "Error 0x%x when releasing the target\n", rc); 1702 1703 dev_kfree_skb(resp); 1704 return rc; 1705 } 1706 1707 static void pn533_deactivate_target(struct nfc_dev *nfc_dev, 1708 struct nfc_target *target, u8 mode) 1709 { 1710 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1711 struct sk_buff *skb; 1712 int rc; 1713 1714 dev_dbg(dev->dev, "%s\n", __func__); 1715 1716 if (!dev->tgt_active_prot) { 1717 nfc_err(dev->dev, "There is no active target\n"); 1718 return; 1719 } 1720 1721 dev->tgt_active_prot = 0; 1722 skb_queue_purge(&dev->resp_q); 1723 1724 skb = pn533_alloc_skb(dev, sizeof(u8)); 1725 if (!skb) 1726 return; 1727 1728 skb_put_u8(skb, 1); /* TG*/ 1729 1730 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb, 1731 pn533_deactivate_target_complete, NULL); 1732 if (rc < 0) { 1733 dev_kfree_skb(skb); 1734 nfc_err(dev->dev, "Target release error %d\n", rc); 1735 } 1736 } 1737 1738 1739 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg, 1740 struct sk_buff *resp) 1741 { 1742 struct pn533_cmd_jump_dep_response *rsp; 1743 u8 target_gt_len; 1744 int rc; 1745 u8 active = *(u8 *)arg; 1746 1747 kfree(arg); 1748 1749 if (IS_ERR(resp)) 1750 return PTR_ERR(resp); 1751 1752 if (dev->tgt_available_prots && 1753 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) { 1754 nfc_err(dev->dev, 1755 "The target does not support DEP\n"); 1756 rc = -EINVAL; 1757 goto error; 1758 } 1759 1760 rsp = (struct pn533_cmd_jump_dep_response *)resp->data; 1761 1762 rc = rsp->status & PN533_CMD_RET_MASK; 1763 if (rc != PN533_CMD_RET_SUCCESS) { 1764 nfc_err(dev->dev, 1765 "Bringing DEP link up failed (error 0x%x)\n", rc); 1766 goto error; 1767 } 1768 1769 if (!dev->tgt_available_prots) { 1770 struct nfc_target nfc_target; 1771 1772 dev_dbg(dev->dev, "Creating new target\n"); 1773 1774 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; 1775 nfc_target.nfcid1_len = 10; 1776 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len); 1777 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); 1778 if (rc) 1779 goto error; 1780 1781 dev->tgt_available_prots = 0; 1782 } 1783 1784 dev->tgt_active_prot = NFC_PROTO_NFC_DEP; 1785 1786 /* ATR_RES general bytes are located at offset 17 */ 1787 target_gt_len = resp->len - 17; 1788 rc = nfc_set_remote_general_bytes(dev->nfc_dev, 1789 rsp->gt, target_gt_len); 1790 if (rc == 0) 1791 rc = nfc_dep_link_is_up(dev->nfc_dev, 1792 dev->nfc_dev->targets[0].idx, 1793 !active, NFC_RF_INITIATOR); 1794 1795 error: 1796 dev_kfree_skb(resp); 1797 return rc; 1798 } 1799 1800 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf); 1801 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 1802 u8 comm_mode, u8 *gb, size_t gb_len) 1803 { 1804 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1805 struct sk_buff *skb; 1806 int rc, skb_len; 1807 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE]; 1808 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3}; 1809 1810 dev_dbg(dev->dev, "%s\n", __func__); 1811 1812 if (dev->poll_mod_count) { 1813 nfc_err(dev->dev, 1814 "Cannot bring the DEP link up while polling\n"); 1815 return -EBUSY; 1816 } 1817 1818 if (dev->tgt_active_prot) { 1819 nfc_err(dev->dev, 1820 "There is already an active target\n"); 1821 return -EBUSY; 1822 } 1823 1824 skb_len = 3 + gb_len; /* ActPass + BR + Next */ 1825 skb_len += PASSIVE_DATA_LEN; 1826 1827 /* NFCID3 */ 1828 skb_len += NFC_NFCID3_MAXSIZE; 1829 if (target && !target->nfcid2_len) { 1830 nfcid3[0] = 0x1; 1831 nfcid3[1] = 0xfe; 1832 get_random_bytes(nfcid3 + 2, 6); 1833 } 1834 1835 skb = pn533_alloc_skb(dev, skb_len); 1836 if (!skb) 1837 return -ENOMEM; 1838 1839 skb_put_u8(skb, !comm_mode); /* ActPass */ 1840 skb_put_u8(skb, 0x02); /* 424 kbps */ 1841 1842 next = skb_put(skb, 1); /* Next */ 1843 *next = 0; 1844 1845 /* Copy passive data */ 1846 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN); 1847 *next |= 1; 1848 1849 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */ 1850 if (target && target->nfcid2_len) 1851 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2, 1852 target->nfcid2_len); 1853 else 1854 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE); 1855 *next |= 2; 1856 1857 if (gb != NULL && gb_len > 0) { 1858 skb_put_data(skb, gb, gb_len); 1859 *next |= 4; /* We have some Gi */ 1860 } else { 1861 *next = 0; 1862 } 1863 1864 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 1865 if (!arg) { 1866 dev_kfree_skb(skb); 1867 return -ENOMEM; 1868 } 1869 1870 *arg = !comm_mode; 1871 1872 pn533_rf_field(dev->nfc_dev, 0); 1873 1874 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb, 1875 pn533_in_dep_link_up_complete, arg); 1876 1877 if (rc < 0) { 1878 dev_kfree_skb(skb); 1879 kfree(arg); 1880 } 1881 1882 return rc; 1883 } 1884 1885 static int pn533_dep_link_down(struct nfc_dev *nfc_dev) 1886 { 1887 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1888 1889 dev_dbg(dev->dev, "%s\n", __func__); 1890 1891 pn533_poll_reset_mod_list(dev); 1892 1893 if (dev->tgt_mode || dev->tgt_active_prot) 1894 dev->phy_ops->abort_cmd(dev, GFP_KERNEL); 1895 1896 dev->tgt_active_prot = 0; 1897 dev->tgt_mode = 0; 1898 1899 skb_queue_purge(&dev->resp_q); 1900 1901 return 0; 1902 } 1903 1904 struct pn533_data_exchange_arg { 1905 data_exchange_cb_t cb; 1906 void *cb_context; 1907 }; 1908 1909 static struct sk_buff *pn533_build_response(struct pn533 *dev) 1910 { 1911 struct sk_buff *skb, *tmp, *t; 1912 unsigned int skb_len = 0, tmp_len = 0; 1913 1914 dev_dbg(dev->dev, "%s\n", __func__); 1915 1916 if (skb_queue_empty(&dev->resp_q)) 1917 return NULL; 1918 1919 if (skb_queue_len(&dev->resp_q) == 1) { 1920 skb = skb_dequeue(&dev->resp_q); 1921 goto out; 1922 } 1923 1924 skb_queue_walk_safe(&dev->resp_q, tmp, t) 1925 skb_len += tmp->len; 1926 1927 dev_dbg(dev->dev, "%s total length %d\n", 1928 __func__, skb_len); 1929 1930 skb = alloc_skb(skb_len, GFP_KERNEL); 1931 if (skb == NULL) 1932 goto out; 1933 1934 skb_put(skb, skb_len); 1935 1936 skb_queue_walk_safe(&dev->resp_q, tmp, t) { 1937 memcpy(skb->data + tmp_len, tmp->data, tmp->len); 1938 tmp_len += tmp->len; 1939 } 1940 1941 out: 1942 skb_queue_purge(&dev->resp_q); 1943 1944 return skb; 1945 } 1946 1947 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg, 1948 struct sk_buff *resp) 1949 { 1950 struct pn533_data_exchange_arg *arg = _arg; 1951 struct sk_buff *skb; 1952 int rc = 0; 1953 u8 status, ret, mi; 1954 1955 dev_dbg(dev->dev, "%s\n", __func__); 1956 1957 if (IS_ERR(resp)) { 1958 rc = PTR_ERR(resp); 1959 goto _error; 1960 } 1961 1962 status = resp->data[0]; 1963 ret = status & PN533_CMD_RET_MASK; 1964 mi = status & PN533_CMD_MI_MASK; 1965 1966 skb_pull(resp, sizeof(status)); 1967 1968 if (ret != PN533_CMD_RET_SUCCESS) { 1969 nfc_err(dev->dev, 1970 "Exchanging data failed (error 0x%x)\n", ret); 1971 rc = -EIO; 1972 goto error; 1973 } 1974 1975 skb_queue_tail(&dev->resp_q, resp); 1976 1977 if (mi) { 1978 dev->cmd_complete_mi_arg = arg; 1979 queue_work(dev->wq, &dev->mi_rx_work); 1980 return -EINPROGRESS; 1981 } 1982 1983 /* Prepare for the next round */ 1984 if (skb_queue_len(&dev->fragment_skb) > 0) { 1985 dev->cmd_complete_dep_arg = arg; 1986 queue_work(dev->wq, &dev->mi_tx_work); 1987 1988 return -EINPROGRESS; 1989 } 1990 1991 skb = pn533_build_response(dev); 1992 if (!skb) { 1993 rc = -ENOMEM; 1994 goto error; 1995 } 1996 1997 arg->cb(arg->cb_context, skb, 0); 1998 kfree(arg); 1999 return 0; 2000 2001 error: 2002 dev_kfree_skb(resp); 2003 _error: 2004 skb_queue_purge(&dev->resp_q); 2005 arg->cb(arg->cb_context, NULL, rc); 2006 kfree(arg); 2007 return rc; 2008 } 2009 2010 /* 2011 * Receive an incoming pn533 frame. skb contains only header and payload. 2012 * If skb == NULL, it is a notification that the link below is dead. 2013 */ 2014 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status) 2015 { 2016 if (!dev->cmd) 2017 goto sched_wq; 2018 2019 dev->cmd->status = status; 2020 2021 if (status != 0) { 2022 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status); 2023 goto sched_wq; 2024 } 2025 2026 if (skb == NULL) { 2027 pr_err("NULL Frame -> link is dead\n"); 2028 goto sched_wq; 2029 } 2030 2031 if (pn533_rx_frame_is_ack(skb->data)) { 2032 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__); 2033 dev_kfree_skb(skb); 2034 return; 2035 } 2036 2037 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data, 2038 dev->ops->rx_frame_size(skb->data), false); 2039 2040 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) { 2041 nfc_err(dev->dev, "Received an invalid frame\n"); 2042 dev->cmd->status = -EIO; 2043 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) { 2044 nfc_err(dev->dev, "It it not the response to the last command\n"); 2045 dev->cmd->status = -EIO; 2046 } 2047 2048 dev->cmd->resp = skb; 2049 2050 sched_wq: 2051 queue_work(dev->wq, &dev->cmd_complete_work); 2052 } 2053 EXPORT_SYMBOL(pn533_recv_frame); 2054 2055 /* Split the Tx skb into small chunks */ 2056 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb) 2057 { 2058 struct sk_buff *frag; 2059 int frag_size; 2060 2061 do { 2062 /* Remaining size */ 2063 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN) 2064 frag_size = PN533_CMD_DATAFRAME_MAXLEN; 2065 else 2066 frag_size = skb->len; 2067 2068 /* Allocate and reserve */ 2069 frag = pn533_alloc_skb(dev, frag_size); 2070 if (!frag) { 2071 skb_queue_purge(&dev->fragment_skb); 2072 break; 2073 } 2074 2075 if (!dev->tgt_mode) { 2076 /* Reserve the TG/MI byte */ 2077 skb_reserve(frag, 1); 2078 2079 /* MI + TG */ 2080 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN) 2081 *(u8 *)skb_push(frag, sizeof(u8)) = 2082 (PN533_CMD_MI_MASK | 1); 2083 else 2084 *(u8 *)skb_push(frag, sizeof(u8)) = 1; /* TG */ 2085 } 2086 2087 skb_put_data(frag, skb->data, frag_size); 2088 2089 /* Reduce the size of incoming buffer */ 2090 skb_pull(skb, frag_size); 2091 2092 /* Add this to skb_queue */ 2093 skb_queue_tail(&dev->fragment_skb, frag); 2094 2095 } while (skb->len > 0); 2096 2097 dev_kfree_skb(skb); 2098 2099 return skb_queue_len(&dev->fragment_skb); 2100 } 2101 2102 static int pn533_transceive(struct nfc_dev *nfc_dev, 2103 struct nfc_target *target, struct sk_buff *skb, 2104 data_exchange_cb_t cb, void *cb_context) 2105 { 2106 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2107 struct pn533_data_exchange_arg *arg = NULL; 2108 int rc; 2109 2110 dev_dbg(dev->dev, "%s\n", __func__); 2111 2112 if (!dev->tgt_active_prot) { 2113 nfc_err(dev->dev, 2114 "Can't exchange data if there is no active target\n"); 2115 rc = -EINVAL; 2116 goto error; 2117 } 2118 2119 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 2120 if (!arg) { 2121 rc = -ENOMEM; 2122 goto error; 2123 } 2124 2125 arg->cb = cb; 2126 arg->cb_context = cb_context; 2127 2128 switch (dev->device_type) { 2129 case PN533_DEVICE_PASORI: 2130 if (dev->tgt_active_prot == NFC_PROTO_FELICA) { 2131 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU, 2132 skb, 2133 pn533_data_exchange_complete, 2134 arg); 2135 2136 break; 2137 } 2138 /* fall through */ 2139 default: 2140 /* jumbo frame ? */ 2141 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { 2142 rc = pn533_fill_fragment_skbs(dev, skb); 2143 if (rc <= 0) 2144 goto error; 2145 2146 skb = skb_dequeue(&dev->fragment_skb); 2147 if (!skb) { 2148 rc = -EIO; 2149 goto error; 2150 } 2151 } else { 2152 *(u8 *)skb_push(skb, sizeof(u8)) = 1; /* TG */ 2153 } 2154 2155 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE, 2156 skb, pn533_data_exchange_complete, 2157 arg); 2158 2159 break; 2160 } 2161 2162 if (rc < 0) /* rc from send_async */ 2163 goto error; 2164 2165 return 0; 2166 2167 error: 2168 kfree(arg); 2169 dev_kfree_skb(skb); 2170 return rc; 2171 } 2172 2173 static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 2174 struct sk_buff *resp) 2175 { 2176 u8 status; 2177 2178 dev_dbg(dev->dev, "%s\n", __func__); 2179 2180 if (IS_ERR(resp)) 2181 return PTR_ERR(resp); 2182 2183 status = resp->data[0]; 2184 2185 /* Prepare for the next round */ 2186 if (skb_queue_len(&dev->fragment_skb) > 0) { 2187 queue_work(dev->wq, &dev->mi_tm_tx_work); 2188 return -EINPROGRESS; 2189 } 2190 dev_kfree_skb(resp); 2191 2192 if (status != 0) { 2193 nfc_tm_deactivated(dev->nfc_dev); 2194 2195 dev->tgt_mode = 0; 2196 2197 return 0; 2198 } 2199 2200 queue_work(dev->wq, &dev->tg_work); 2201 2202 return 0; 2203 } 2204 2205 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 2206 { 2207 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2208 int rc; 2209 2210 dev_dbg(dev->dev, "%s\n", __func__); 2211 2212 /* let's split in multiple chunks if size's too big */ 2213 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { 2214 rc = pn533_fill_fragment_skbs(dev, skb); 2215 if (rc <= 0) 2216 goto error; 2217 2218 /* get the first skb */ 2219 skb = skb_dequeue(&dev->fragment_skb); 2220 if (!skb) { 2221 rc = -EIO; 2222 goto error; 2223 } 2224 2225 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb, 2226 pn533_tm_send_complete, NULL); 2227 } else { 2228 /* Send th skb */ 2229 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb, 2230 pn533_tm_send_complete, NULL); 2231 } 2232 2233 error: 2234 if (rc < 0) { 2235 dev_kfree_skb(skb); 2236 skb_queue_purge(&dev->fragment_skb); 2237 } 2238 2239 return rc; 2240 } 2241 2242 static void pn533_wq_mi_recv(struct work_struct *work) 2243 { 2244 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work); 2245 struct sk_buff *skb; 2246 int rc; 2247 2248 dev_dbg(dev->dev, "%s\n", __func__); 2249 2250 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN); 2251 if (!skb) 2252 goto error; 2253 2254 switch (dev->device_type) { 2255 case PN533_DEVICE_PASORI: 2256 if (dev->tgt_active_prot == NFC_PROTO_FELICA) { 2257 rc = pn533_send_cmd_direct_async(dev, 2258 PN533_CMD_IN_COMM_THRU, 2259 skb, 2260 pn533_data_exchange_complete, 2261 dev->cmd_complete_mi_arg); 2262 2263 break; 2264 } 2265 /* fall through */ 2266 default: 2267 skb_put_u8(skb, 1); /*TG*/ 2268 2269 rc = pn533_send_cmd_direct_async(dev, 2270 PN533_CMD_IN_DATA_EXCHANGE, 2271 skb, 2272 pn533_data_exchange_complete, 2273 dev->cmd_complete_mi_arg); 2274 2275 break; 2276 } 2277 2278 if (rc == 0) /* success */ 2279 return; 2280 2281 nfc_err(dev->dev, 2282 "Error %d when trying to perform data_exchange\n", rc); 2283 2284 dev_kfree_skb(skb); 2285 kfree(dev->cmd_complete_mi_arg); 2286 2287 error: 2288 dev->phy_ops->send_ack(dev, GFP_KERNEL); 2289 queue_work(dev->wq, &dev->cmd_work); 2290 } 2291 2292 static void pn533_wq_mi_send(struct work_struct *work) 2293 { 2294 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work); 2295 struct sk_buff *skb; 2296 int rc; 2297 2298 dev_dbg(dev->dev, "%s\n", __func__); 2299 2300 /* Grab the first skb in the queue */ 2301 skb = skb_dequeue(&dev->fragment_skb); 2302 2303 if (skb == NULL) { /* No more data */ 2304 /* Reset the queue for future use */ 2305 skb_queue_head_init(&dev->fragment_skb); 2306 goto error; 2307 } 2308 2309 switch (dev->device_type) { 2310 case PN533_DEVICE_PASORI: 2311 if (dev->tgt_active_prot != NFC_PROTO_FELICA) { 2312 rc = -EIO; 2313 break; 2314 } 2315 2316 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU, 2317 skb, 2318 pn533_data_exchange_complete, 2319 dev->cmd_complete_dep_arg); 2320 2321 break; 2322 2323 default: 2324 /* Still some fragments? */ 2325 rc = pn533_send_cmd_direct_async(dev, 2326 PN533_CMD_IN_DATA_EXCHANGE, 2327 skb, 2328 pn533_data_exchange_complete, 2329 dev->cmd_complete_dep_arg); 2330 2331 break; 2332 } 2333 2334 if (rc == 0) /* success */ 2335 return; 2336 2337 nfc_err(dev->dev, 2338 "Error %d when trying to perform data_exchange\n", rc); 2339 2340 dev_kfree_skb(skb); 2341 kfree(dev->cmd_complete_dep_arg); 2342 2343 error: 2344 dev->phy_ops->send_ack(dev, GFP_KERNEL); 2345 queue_work(dev->wq, &dev->cmd_work); 2346 } 2347 2348 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata, 2349 u8 cfgdata_len) 2350 { 2351 struct sk_buff *skb; 2352 struct sk_buff *resp; 2353 int skb_len; 2354 2355 dev_dbg(dev->dev, "%s\n", __func__); 2356 2357 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */ 2358 2359 skb = pn533_alloc_skb(dev, skb_len); 2360 if (!skb) 2361 return -ENOMEM; 2362 2363 skb_put_u8(skb, cfgitem); 2364 skb_put_data(skb, cfgdata, cfgdata_len); 2365 2366 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb); 2367 if (IS_ERR(resp)) 2368 return PTR_ERR(resp); 2369 2370 dev_kfree_skb(resp); 2371 return 0; 2372 } 2373 2374 static int pn533_get_firmware_version(struct pn533 *dev, 2375 struct pn533_fw_version *fv) 2376 { 2377 struct sk_buff *skb; 2378 struct sk_buff *resp; 2379 2380 skb = pn533_alloc_skb(dev, 0); 2381 if (!skb) 2382 return -ENOMEM; 2383 2384 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb); 2385 if (IS_ERR(resp)) 2386 return PTR_ERR(resp); 2387 2388 fv->ic = resp->data[0]; 2389 fv->ver = resp->data[1]; 2390 fv->rev = resp->data[2]; 2391 fv->support = resp->data[3]; 2392 2393 dev_kfree_skb(resp); 2394 return 0; 2395 } 2396 2397 static int pn533_pasori_fw_reset(struct pn533 *dev) 2398 { 2399 struct sk_buff *skb; 2400 struct sk_buff *resp; 2401 2402 dev_dbg(dev->dev, "%s\n", __func__); 2403 2404 skb = pn533_alloc_skb(dev, sizeof(u8)); 2405 if (!skb) 2406 return -ENOMEM; 2407 2408 skb_put_u8(skb, 0x1); 2409 2410 resp = pn533_send_cmd_sync(dev, 0x18, skb); 2411 if (IS_ERR(resp)) 2412 return PTR_ERR(resp); 2413 2414 dev_kfree_skb(resp); 2415 2416 return 0; 2417 } 2418 2419 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf) 2420 { 2421 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2422 u8 rf_field = !!rf; 2423 int rc; 2424 2425 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA; 2426 2427 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD, 2428 (u8 *)&rf_field, 1); 2429 if (rc) { 2430 nfc_err(dev->dev, "Error on setting RF field\n"); 2431 return rc; 2432 } 2433 2434 return rc; 2435 } 2436 2437 static int pn532_sam_configuration(struct nfc_dev *nfc_dev) 2438 { 2439 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2440 struct sk_buff *skb; 2441 struct sk_buff *resp; 2442 2443 skb = pn533_alloc_skb(dev, 1); 2444 if (!skb) 2445 return -ENOMEM; 2446 2447 skb_put_u8(skb, 0x01); 2448 2449 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb); 2450 if (IS_ERR(resp)) 2451 return PTR_ERR(resp); 2452 2453 dev_kfree_skb(resp); 2454 return 0; 2455 } 2456 2457 static int pn533_dev_up(struct nfc_dev *nfc_dev) 2458 { 2459 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2460 2461 if (dev->device_type == PN533_DEVICE_PN532) { 2462 int rc = pn532_sam_configuration(nfc_dev); 2463 2464 if (rc) 2465 return rc; 2466 } 2467 2468 return pn533_rf_field(nfc_dev, 1); 2469 } 2470 2471 static int pn533_dev_down(struct nfc_dev *nfc_dev) 2472 { 2473 return pn533_rf_field(nfc_dev, 0); 2474 } 2475 2476 static struct nfc_ops pn533_nfc_ops = { 2477 .dev_up = pn533_dev_up, 2478 .dev_down = pn533_dev_down, 2479 .dep_link_up = pn533_dep_link_up, 2480 .dep_link_down = pn533_dep_link_down, 2481 .start_poll = pn533_start_poll, 2482 .stop_poll = pn533_stop_poll, 2483 .activate_target = pn533_activate_target, 2484 .deactivate_target = pn533_deactivate_target, 2485 .im_transceive = pn533_transceive, 2486 .tm_send = pn533_tm_send, 2487 }; 2488 2489 static int pn533_setup(struct pn533 *dev) 2490 { 2491 struct pn533_config_max_retries max_retries; 2492 struct pn533_config_timing timing; 2493 u8 pasori_cfg[3] = {0x08, 0x01, 0x08}; 2494 int rc; 2495 2496 switch (dev->device_type) { 2497 case PN533_DEVICE_STD: 2498 case PN533_DEVICE_PASORI: 2499 case PN533_DEVICE_ACR122U: 2500 case PN533_DEVICE_PN532: 2501 max_retries.mx_rty_atr = 0x2; 2502 max_retries.mx_rty_psl = 0x1; 2503 max_retries.mx_rty_passive_act = 2504 PN533_CONFIG_MAX_RETRIES_NO_RETRY; 2505 2506 timing.rfu = PN533_CONFIG_TIMING_102; 2507 timing.atr_res_timeout = PN533_CONFIG_TIMING_102; 2508 timing.dep_timeout = PN533_CONFIG_TIMING_204; 2509 2510 break; 2511 2512 default: 2513 nfc_err(dev->dev, "Unknown device type %d\n", 2514 dev->device_type); 2515 return -EINVAL; 2516 } 2517 2518 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES, 2519 (u8 *)&max_retries, sizeof(max_retries)); 2520 if (rc) { 2521 nfc_err(dev->dev, 2522 "Error on setting MAX_RETRIES config\n"); 2523 return rc; 2524 } 2525 2526 2527 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING, 2528 (u8 *)&timing, sizeof(timing)); 2529 if (rc) { 2530 nfc_err(dev->dev, "Error on setting RF timings\n"); 2531 return rc; 2532 } 2533 2534 switch (dev->device_type) { 2535 case PN533_DEVICE_STD: 2536 case PN533_DEVICE_PN532: 2537 break; 2538 2539 case PN533_DEVICE_PASORI: 2540 pn533_pasori_fw_reset(dev); 2541 2542 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI, 2543 pasori_cfg, 3); 2544 if (rc) { 2545 nfc_err(dev->dev, 2546 "Error while settings PASORI config\n"); 2547 return rc; 2548 } 2549 2550 pn533_pasori_fw_reset(dev); 2551 2552 break; 2553 } 2554 2555 return 0; 2556 } 2557 2558 int pn533_finalize_setup(struct pn533 *dev) 2559 { 2560 2561 struct pn533_fw_version fw_ver; 2562 int rc; 2563 2564 memset(&fw_ver, 0, sizeof(fw_ver)); 2565 2566 rc = pn533_get_firmware_version(dev, &fw_ver); 2567 if (rc) { 2568 nfc_err(dev->dev, "Unable to get FW version\n"); 2569 return rc; 2570 } 2571 2572 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n", 2573 fw_ver.ic, fw_ver.ver, fw_ver.rev); 2574 2575 rc = pn533_setup(dev); 2576 if (rc) 2577 return rc; 2578 2579 return 0; 2580 } 2581 EXPORT_SYMBOL_GPL(pn533_finalize_setup); 2582 2583 struct pn533 *pn533_register_device(u32 device_type, 2584 u32 protocols, 2585 enum pn533_protocol_type protocol_type, 2586 void *phy, 2587 struct pn533_phy_ops *phy_ops, 2588 struct pn533_frame_ops *fops, 2589 struct device *dev, 2590 struct device *parent) 2591 { 2592 struct pn533 *priv; 2593 int rc = -ENOMEM; 2594 2595 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2596 if (!priv) 2597 return ERR_PTR(-ENOMEM); 2598 2599 priv->phy = phy; 2600 priv->phy_ops = phy_ops; 2601 priv->dev = dev; 2602 if (fops != NULL) 2603 priv->ops = fops; 2604 else 2605 priv->ops = &pn533_std_frame_ops; 2606 2607 priv->protocol_type = protocol_type; 2608 priv->device_type = device_type; 2609 2610 mutex_init(&priv->cmd_lock); 2611 2612 INIT_WORK(&priv->cmd_work, pn533_wq_cmd); 2613 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete); 2614 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv); 2615 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send); 2616 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data); 2617 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv); 2618 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send); 2619 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll); 2620 INIT_WORK(&priv->rf_work, pn533_wq_rf); 2621 priv->wq = alloc_ordered_workqueue("pn533", 0); 2622 if (priv->wq == NULL) 2623 goto error; 2624 2625 timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0); 2626 2627 skb_queue_head_init(&priv->resp_q); 2628 skb_queue_head_init(&priv->fragment_skb); 2629 2630 INIT_LIST_HEAD(&priv->cmd_queue); 2631 2632 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols, 2633 priv->ops->tx_header_len + 2634 PN533_CMD_DATAEXCH_HEAD_LEN, 2635 priv->ops->tx_tail_len); 2636 if (!priv->nfc_dev) { 2637 rc = -ENOMEM; 2638 goto destroy_wq; 2639 } 2640 2641 nfc_set_parent_dev(priv->nfc_dev, parent); 2642 nfc_set_drvdata(priv->nfc_dev, priv); 2643 2644 rc = nfc_register_device(priv->nfc_dev); 2645 if (rc) 2646 goto free_nfc_dev; 2647 2648 return priv; 2649 2650 free_nfc_dev: 2651 nfc_free_device(priv->nfc_dev); 2652 2653 destroy_wq: 2654 destroy_workqueue(priv->wq); 2655 error: 2656 kfree(priv); 2657 return ERR_PTR(rc); 2658 } 2659 EXPORT_SYMBOL_GPL(pn533_register_device); 2660 2661 void pn533_unregister_device(struct pn533 *priv) 2662 { 2663 struct pn533_cmd *cmd, *n; 2664 2665 nfc_unregister_device(priv->nfc_dev); 2666 nfc_free_device(priv->nfc_dev); 2667 2668 flush_delayed_work(&priv->poll_work); 2669 destroy_workqueue(priv->wq); 2670 2671 skb_queue_purge(&priv->resp_q); 2672 2673 del_timer(&priv->listen_timer); 2674 2675 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) { 2676 list_del(&cmd->queue); 2677 kfree(cmd); 2678 } 2679 2680 kfree(priv); 2681 } 2682 EXPORT_SYMBOL_GPL(pn533_unregister_device); 2683 2684 2685 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); 2686 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>"); 2687 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>"); 2688 MODULE_DESCRIPTION("PN533 driver ver " VERSION); 2689 MODULE_VERSION(VERSION); 2690 MODULE_LICENSE("GPL"); 2691