1 /* 2 * Driver for NXP PN533 NFC Chip - core functions 3 * 4 * Copyright (C) 2011 Instituto Nokia de Tecnologia 5 * Copyright (C) 2012-2013 Tieto Poland 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include <linux/device.h> 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/slab.h> 25 #include <linux/nfc.h> 26 #include <linux/netdevice.h> 27 #include <net/nfc/nfc.h> 28 #include "pn533.h" 29 30 #define VERSION "0.3" 31 32 /* How much time we spend listening for initiators */ 33 #define PN533_LISTEN_TIME 2 34 /* Delay between each poll frame (ms) */ 35 #define PN533_POLL_INTERVAL 10 36 37 /* structs for pn533 commands */ 38 39 /* PN533_CMD_GET_FIRMWARE_VERSION */ 40 struct pn533_fw_version { 41 u8 ic; 42 u8 ver; 43 u8 rev; 44 u8 support; 45 }; 46 47 /* PN533_CMD_RF_CONFIGURATION */ 48 #define PN533_CFGITEM_RF_FIELD 0x01 49 #define PN533_CFGITEM_TIMING 0x02 50 #define PN533_CFGITEM_MAX_RETRIES 0x05 51 #define PN533_CFGITEM_PASORI 0x82 52 53 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2 54 #define PN533_CFGITEM_RF_FIELD_ON 0x1 55 #define PN533_CFGITEM_RF_FIELD_OFF 0x0 56 57 #define PN533_CONFIG_TIMING_102 0xb 58 #define PN533_CONFIG_TIMING_204 0xc 59 #define PN533_CONFIG_TIMING_409 0xd 60 #define PN533_CONFIG_TIMING_819 0xe 61 62 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00 63 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF 64 65 struct pn533_config_max_retries { 66 u8 mx_rty_atr; 67 u8 mx_rty_psl; 68 u8 mx_rty_passive_act; 69 } __packed; 70 71 struct pn533_config_timing { 72 u8 rfu; 73 u8 atr_res_timeout; 74 u8 dep_timeout; 75 } __packed; 76 77 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */ 78 79 /* felica commands opcode */ 80 #define PN533_FELICA_OPC_SENSF_REQ 0 81 #define PN533_FELICA_OPC_SENSF_RES 1 82 /* felica SENSF_REQ parameters */ 83 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF 84 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0 85 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1 86 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2 87 88 /* type B initiator_data values */ 89 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0 90 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0 91 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1 92 93 union pn533_cmd_poll_initdata { 94 struct { 95 u8 afi; 96 u8 polling_method; 97 } __packed type_b; 98 struct { 99 u8 opcode; 100 __be16 sc; 101 u8 rc; 102 u8 tsn; 103 } __packed felica; 104 }; 105 106 struct pn533_poll_modulations { 107 struct { 108 u8 maxtg; 109 u8 brty; 110 union pn533_cmd_poll_initdata initiator_data; 111 } __packed data; 112 u8 len; 113 }; 114 115 static const struct pn533_poll_modulations poll_mod[] = { 116 [PN533_POLL_MOD_106KBPS_A] = { 117 .data = { 118 .maxtg = 1, 119 .brty = 0, 120 }, 121 .len = 2, 122 }, 123 [PN533_POLL_MOD_212KBPS_FELICA] = { 124 .data = { 125 .maxtg = 1, 126 .brty = 1, 127 .initiator_data.felica = { 128 .opcode = PN533_FELICA_OPC_SENSF_REQ, 129 .sc = PN533_FELICA_SENSF_SC_ALL, 130 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE, 131 .tsn = 0x03, 132 }, 133 }, 134 .len = 7, 135 }, 136 [PN533_POLL_MOD_424KBPS_FELICA] = { 137 .data = { 138 .maxtg = 1, 139 .brty = 2, 140 .initiator_data.felica = { 141 .opcode = PN533_FELICA_OPC_SENSF_REQ, 142 .sc = PN533_FELICA_SENSF_SC_ALL, 143 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE, 144 .tsn = 0x03, 145 }, 146 }, 147 .len = 7, 148 }, 149 [PN533_POLL_MOD_106KBPS_JEWEL] = { 150 .data = { 151 .maxtg = 1, 152 .brty = 4, 153 }, 154 .len = 2, 155 }, 156 [PN533_POLL_MOD_847KBPS_B] = { 157 .data = { 158 .maxtg = 1, 159 .brty = 8, 160 .initiator_data.type_b = { 161 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES, 162 .polling_method = 163 PN533_TYPE_B_POLL_METHOD_TIMESLOT, 164 }, 165 }, 166 .len = 3, 167 }, 168 [PN533_LISTEN_MOD] = { 169 .len = 0, 170 }, 171 }; 172 173 /* PN533_CMD_IN_ATR */ 174 175 struct pn533_cmd_activate_response { 176 u8 status; 177 u8 nfcid3t[10]; 178 u8 didt; 179 u8 bst; 180 u8 brt; 181 u8 to; 182 u8 ppt; 183 /* optional */ 184 u8 gt[]; 185 } __packed; 186 187 struct pn533_cmd_jump_dep_response { 188 u8 status; 189 u8 tg; 190 u8 nfcid3t[10]; 191 u8 didt; 192 u8 bst; 193 u8 brt; 194 u8 to; 195 u8 ppt; 196 /* optional */ 197 u8 gt[]; 198 } __packed; 199 200 201 /* PN533_TG_INIT_AS_TARGET */ 202 #define PN533_INIT_TARGET_PASSIVE 0x1 203 #define PN533_INIT_TARGET_DEP 0x2 204 205 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3 206 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1 207 #define PN533_INIT_TARGET_RESP_DEP 0x4 208 209 /* The rule: value(high byte) + value(low byte) + checksum = 0 */ 210 static inline u8 pn533_ext_checksum(u16 value) 211 { 212 return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1; 213 } 214 215 /* The rule: value + checksum = 0 */ 216 static inline u8 pn533_std_checksum(u8 value) 217 { 218 return ~value + 1; 219 } 220 221 /* The rule: sum(data elements) + checksum = 0 */ 222 static u8 pn533_std_data_checksum(u8 *data, int datalen) 223 { 224 u8 sum = 0; 225 int i; 226 227 for (i = 0; i < datalen; i++) 228 sum += data[i]; 229 230 return pn533_std_checksum(sum); 231 } 232 233 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code) 234 { 235 struct pn533_std_frame *frame = _frame; 236 237 frame->preamble = 0; 238 frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF); 239 PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT; 240 PN533_FRAME_CMD(frame) = cmd_code; 241 frame->datalen = 2; 242 } 243 244 static void pn533_std_tx_frame_finish(void *_frame) 245 { 246 struct pn533_std_frame *frame = _frame; 247 248 frame->datalen_checksum = pn533_std_checksum(frame->datalen); 249 250 PN533_STD_FRAME_CHECKSUM(frame) = 251 pn533_std_data_checksum(frame->data, frame->datalen); 252 253 PN533_STD_FRAME_POSTAMBLE(frame) = 0; 254 } 255 256 static void pn533_std_tx_update_payload_len(void *_frame, int len) 257 { 258 struct pn533_std_frame *frame = _frame; 259 260 frame->datalen += len; 261 } 262 263 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev) 264 { 265 u8 checksum; 266 struct pn533_std_frame *stdf = _frame; 267 268 if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF)) 269 return false; 270 271 if (likely(!PN533_STD_IS_EXTENDED(stdf))) { 272 /* Standard frame code */ 273 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN; 274 275 checksum = pn533_std_checksum(stdf->datalen); 276 if (checksum != stdf->datalen_checksum) 277 return false; 278 279 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen); 280 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf)) 281 return false; 282 } else { 283 /* Extended */ 284 struct pn533_ext_frame *eif = _frame; 285 286 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN; 287 288 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen)); 289 if (checksum != eif->datalen_checksum) 290 return false; 291 292 /* check data checksum */ 293 checksum = pn533_std_data_checksum(eif->data, 294 be16_to_cpu(eif->datalen)); 295 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif)) 296 return false; 297 } 298 299 return true; 300 } 301 302 bool pn533_rx_frame_is_ack(void *_frame) 303 { 304 struct pn533_std_frame *frame = _frame; 305 306 if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF)) 307 return false; 308 309 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF) 310 return false; 311 312 return true; 313 } 314 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack); 315 316 static inline int pn533_std_rx_frame_size(void *frame) 317 { 318 struct pn533_std_frame *f = frame; 319 320 /* check for Extended Information frame */ 321 if (PN533_STD_IS_EXTENDED(f)) { 322 struct pn533_ext_frame *eif = frame; 323 324 return sizeof(struct pn533_ext_frame) 325 + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN; 326 } 327 328 return sizeof(struct pn533_std_frame) + f->datalen + 329 PN533_STD_FRAME_TAIL_LEN; 330 } 331 332 static u8 pn533_std_get_cmd_code(void *frame) 333 { 334 struct pn533_std_frame *f = frame; 335 struct pn533_ext_frame *eif = frame; 336 337 if (PN533_STD_IS_EXTENDED(f)) 338 return PN533_FRAME_CMD(eif); 339 else 340 return PN533_FRAME_CMD(f); 341 } 342 343 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame) 344 { 345 return (dev->ops->get_cmd_code(frame) == 346 PN533_CMD_RESPONSE(dev->cmd->code)); 347 } 348 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response); 349 350 351 static struct pn533_frame_ops pn533_std_frame_ops = { 352 .tx_frame_init = pn533_std_tx_frame_init, 353 .tx_frame_finish = pn533_std_tx_frame_finish, 354 .tx_update_payload_len = pn533_std_tx_update_payload_len, 355 .tx_header_len = PN533_STD_FRAME_HEADER_LEN, 356 .tx_tail_len = PN533_STD_FRAME_TAIL_LEN, 357 358 .rx_is_frame_valid = pn533_std_rx_frame_is_valid, 359 .rx_frame_size = pn533_std_rx_frame_size, 360 .rx_header_len = PN533_STD_FRAME_HEADER_LEN, 361 .rx_tail_len = PN533_STD_FRAME_TAIL_LEN, 362 363 .max_payload_len = PN533_STD_FRAME_MAX_PAYLOAD_LEN, 364 .get_cmd_code = pn533_std_get_cmd_code, 365 }; 366 367 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code, 368 struct sk_buff *skb) 369 { 370 /* payload is already there, just update datalen */ 371 int payload_len = skb->len; 372 struct pn533_frame_ops *ops = dev->ops; 373 374 375 skb_push(skb, ops->tx_header_len); 376 skb_put(skb, ops->tx_tail_len); 377 378 ops->tx_frame_init(skb->data, cmd_code); 379 ops->tx_update_payload_len(skb->data, payload_len); 380 ops->tx_frame_finish(skb->data); 381 } 382 383 static int pn533_send_async_complete(struct pn533 *dev) 384 { 385 struct pn533_cmd *cmd = dev->cmd; 386 struct sk_buff *resp; 387 int status, rc = 0; 388 389 if (!cmd) { 390 dev_dbg(dev->dev, "%s: cmd not set\n", __func__); 391 goto done; 392 } 393 394 dev_kfree_skb(cmd->req); 395 396 status = cmd->status; 397 resp = cmd->resp; 398 399 if (status < 0) { 400 rc = cmd->complete_cb(dev, cmd->complete_cb_context, 401 ERR_PTR(status)); 402 dev_kfree_skb(resp); 403 goto done; 404 } 405 406 /* when no response is set we got interrupted */ 407 if (!resp) 408 resp = ERR_PTR(-EINTR); 409 410 if (!IS_ERR(resp)) { 411 skb_pull(resp, dev->ops->rx_header_len); 412 skb_trim(resp, resp->len - dev->ops->rx_tail_len); 413 } 414 415 rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp); 416 417 done: 418 kfree(cmd); 419 dev->cmd = NULL; 420 return rc; 421 } 422 423 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code, 424 struct sk_buff *req, 425 pn533_send_async_complete_t complete_cb, 426 void *complete_cb_context) 427 { 428 struct pn533_cmd *cmd; 429 int rc = 0; 430 431 dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code); 432 433 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 434 if (!cmd) 435 return -ENOMEM; 436 437 cmd->code = cmd_code; 438 cmd->req = req; 439 cmd->complete_cb = complete_cb; 440 cmd->complete_cb_context = complete_cb_context; 441 442 pn533_build_cmd_frame(dev, cmd_code, req); 443 444 mutex_lock(&dev->cmd_lock); 445 446 if (!dev->cmd_pending) { 447 dev->cmd = cmd; 448 rc = dev->phy_ops->send_frame(dev, req); 449 if (rc) { 450 dev->cmd = NULL; 451 goto error; 452 } 453 454 dev->cmd_pending = 1; 455 goto unlock; 456 } 457 458 dev_dbg(dev->dev, "%s Queueing command 0x%x\n", 459 __func__, cmd_code); 460 461 INIT_LIST_HEAD(&cmd->queue); 462 list_add_tail(&cmd->queue, &dev->cmd_queue); 463 464 goto unlock; 465 466 error: 467 kfree(cmd); 468 unlock: 469 mutex_unlock(&dev->cmd_lock); 470 return rc; 471 } 472 473 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code, 474 struct sk_buff *req, 475 pn533_send_async_complete_t complete_cb, 476 void *complete_cb_context) 477 { 478 int rc; 479 480 rc = __pn533_send_async(dev, cmd_code, req, complete_cb, 481 complete_cb_context); 482 483 return rc; 484 } 485 486 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code, 487 struct sk_buff *req, 488 pn533_send_async_complete_t complete_cb, 489 void *complete_cb_context) 490 { 491 int rc; 492 493 rc = __pn533_send_async(dev, cmd_code, req, complete_cb, 494 complete_cb_context); 495 496 return rc; 497 } 498 499 /* 500 * pn533_send_cmd_direct_async 501 * 502 * The function sends a piority cmd directly to the chip omitting the cmd 503 * queue. It's intended to be used by chaining mechanism of received responses 504 * where the host has to request every single chunk of data before scheduling 505 * next cmd from the queue. 506 */ 507 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code, 508 struct sk_buff *req, 509 pn533_send_async_complete_t complete_cb, 510 void *complete_cb_context) 511 { 512 struct pn533_cmd *cmd; 513 int rc; 514 515 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); 516 if (!cmd) 517 return -ENOMEM; 518 519 cmd->code = cmd_code; 520 cmd->req = req; 521 cmd->complete_cb = complete_cb; 522 cmd->complete_cb_context = complete_cb_context; 523 524 pn533_build_cmd_frame(dev, cmd_code, req); 525 526 dev->cmd = cmd; 527 rc = dev->phy_ops->send_frame(dev, req); 528 if (rc < 0) { 529 dev->cmd = NULL; 530 kfree(cmd); 531 } 532 533 return rc; 534 } 535 536 static void pn533_wq_cmd_complete(struct work_struct *work) 537 { 538 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work); 539 int rc; 540 541 rc = pn533_send_async_complete(dev); 542 if (rc != -EINPROGRESS) 543 queue_work(dev->wq, &dev->cmd_work); 544 } 545 546 static void pn533_wq_cmd(struct work_struct *work) 547 { 548 struct pn533 *dev = container_of(work, struct pn533, cmd_work); 549 struct pn533_cmd *cmd; 550 int rc; 551 552 mutex_lock(&dev->cmd_lock); 553 554 if (list_empty(&dev->cmd_queue)) { 555 dev->cmd_pending = 0; 556 mutex_unlock(&dev->cmd_lock); 557 return; 558 } 559 560 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue); 561 562 list_del(&cmd->queue); 563 564 mutex_unlock(&dev->cmd_lock); 565 566 dev->cmd = cmd; 567 rc = dev->phy_ops->send_frame(dev, cmd->req); 568 if (rc < 0) { 569 dev->cmd = NULL; 570 dev_kfree_skb(cmd->req); 571 kfree(cmd); 572 return; 573 } 574 575 } 576 577 struct pn533_sync_cmd_response { 578 struct sk_buff *resp; 579 struct completion done; 580 }; 581 582 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg, 583 struct sk_buff *resp) 584 { 585 struct pn533_sync_cmd_response *arg = _arg; 586 587 arg->resp = resp; 588 complete(&arg->done); 589 590 return 0; 591 } 592 593 /* pn533_send_cmd_sync 594 * 595 * Please note the req parameter is freed inside the function to 596 * limit a number of return value interpretations by the caller. 597 * 598 * 1. negative in case of error during TX path -> req should be freed 599 * 600 * 2. negative in case of error during RX path -> req should not be freed 601 * as it's been already freed at the beginning of RX path by 602 * async_complete_cb. 603 * 604 * 3. valid pointer in case of succesfult RX path 605 * 606 * A caller has to check a return value with IS_ERR macro. If the test pass, 607 * the returned pointer is valid. 608 * 609 */ 610 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code, 611 struct sk_buff *req) 612 { 613 int rc; 614 struct pn533_sync_cmd_response arg; 615 616 init_completion(&arg.done); 617 618 rc = pn533_send_cmd_async(dev, cmd_code, req, 619 pn533_send_sync_complete, &arg); 620 if (rc) { 621 dev_kfree_skb(req); 622 return ERR_PTR(rc); 623 } 624 625 wait_for_completion(&arg.done); 626 627 return arg.resp; 628 } 629 630 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size) 631 { 632 struct sk_buff *skb; 633 634 skb = alloc_skb(dev->ops->tx_header_len + 635 size + 636 dev->ops->tx_tail_len, GFP_KERNEL); 637 638 if (skb) 639 skb_reserve(skb, dev->ops->tx_header_len); 640 641 return skb; 642 } 643 644 struct pn533_target_type_a { 645 __be16 sens_res; 646 u8 sel_res; 647 u8 nfcid_len; 648 u8 nfcid_data[]; 649 } __packed; 650 651 652 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6)) 653 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0)) 654 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8)) 655 656 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00 657 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C 658 659 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5) 660 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2) 661 662 #define PN533_TYPE_A_SEL_PROT_MIFARE 0 663 #define PN533_TYPE_A_SEL_PROT_ISO14443 1 664 #define PN533_TYPE_A_SEL_PROT_DEP 2 665 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3 666 667 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a, 668 int target_data_len) 669 { 670 u8 ssd; 671 u8 platconf; 672 673 if (target_data_len < sizeof(struct pn533_target_type_a)) 674 return false; 675 676 /* 677 * The length check of nfcid[] and ats[] are not being performed because 678 * the values are not being used 679 */ 680 681 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */ 682 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res); 683 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res); 684 685 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL && 686 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) || 687 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL && 688 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL)) 689 return false; 690 691 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */ 692 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0) 693 return false; 694 695 return true; 696 } 697 698 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data, 699 int tgt_data_len) 700 { 701 struct pn533_target_type_a *tgt_type_a; 702 703 tgt_type_a = (struct pn533_target_type_a *)tgt_data; 704 705 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len)) 706 return -EPROTO; 707 708 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) { 709 case PN533_TYPE_A_SEL_PROT_MIFARE: 710 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK; 711 break; 712 case PN533_TYPE_A_SEL_PROT_ISO14443: 713 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK; 714 break; 715 case PN533_TYPE_A_SEL_PROT_DEP: 716 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK; 717 break; 718 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP: 719 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK | 720 NFC_PROTO_NFC_DEP_MASK; 721 break; 722 } 723 724 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res); 725 nfc_tgt->sel_res = tgt_type_a->sel_res; 726 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len; 727 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len); 728 729 return 0; 730 } 731 732 struct pn533_target_felica { 733 u8 pol_res; 734 u8 opcode; 735 u8 nfcid2[NFC_NFCID2_MAXSIZE]; 736 u8 pad[8]; 737 /* optional */ 738 u8 syst_code[]; 739 } __packed; 740 741 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01 742 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE 743 744 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica, 745 int target_data_len) 746 { 747 if (target_data_len < sizeof(struct pn533_target_felica)) 748 return false; 749 750 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES) 751 return false; 752 753 return true; 754 } 755 756 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data, 757 int tgt_data_len) 758 { 759 struct pn533_target_felica *tgt_felica; 760 761 tgt_felica = (struct pn533_target_felica *)tgt_data; 762 763 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len)) 764 return -EPROTO; 765 766 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) && 767 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2)) 768 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK; 769 else 770 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK; 771 772 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9); 773 nfc_tgt->sensf_res_len = 9; 774 775 memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE); 776 nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE; 777 778 return 0; 779 } 780 781 struct pn533_target_jewel { 782 __be16 sens_res; 783 u8 jewelid[4]; 784 } __packed; 785 786 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel, 787 int target_data_len) 788 { 789 u8 ssd; 790 u8 platconf; 791 792 if (target_data_len < sizeof(struct pn533_target_jewel)) 793 return false; 794 795 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */ 796 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res); 797 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res); 798 799 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL && 800 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) || 801 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL && 802 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL)) 803 return false; 804 805 return true; 806 } 807 808 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data, 809 int tgt_data_len) 810 { 811 struct pn533_target_jewel *tgt_jewel; 812 813 tgt_jewel = (struct pn533_target_jewel *)tgt_data; 814 815 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len)) 816 return -EPROTO; 817 818 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK; 819 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res); 820 nfc_tgt->nfcid1_len = 4; 821 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len); 822 823 return 0; 824 } 825 826 struct pn533_type_b_prot_info { 827 u8 bitrate; 828 u8 fsci_type; 829 u8 fwi_adc_fo; 830 } __packed; 831 832 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4) 833 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0) 834 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8 835 836 struct pn533_type_b_sens_res { 837 u8 opcode; 838 u8 nfcid[4]; 839 u8 appdata[4]; 840 struct pn533_type_b_prot_info prot_info; 841 } __packed; 842 843 #define PN533_TYPE_B_OPC_SENSB_RES 0x50 844 845 struct pn533_target_type_b { 846 struct pn533_type_b_sens_res sensb_res; 847 u8 attrib_res_len; 848 u8 attrib_res[]; 849 } __packed; 850 851 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b, 852 int target_data_len) 853 { 854 if (target_data_len < sizeof(struct pn533_target_type_b)) 855 return false; 856 857 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES) 858 return false; 859 860 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) & 861 PN533_TYPE_B_PROT_TYPE_RFU_MASK) 862 return false; 863 864 return true; 865 } 866 867 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data, 868 int tgt_data_len) 869 { 870 struct pn533_target_type_b *tgt_type_b; 871 872 tgt_type_b = (struct pn533_target_type_b *)tgt_data; 873 874 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len)) 875 return -EPROTO; 876 877 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK; 878 879 return 0; 880 } 881 882 static void pn533_poll_reset_mod_list(struct pn533 *dev); 883 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata, 884 int tgdata_len) 885 { 886 struct nfc_target nfc_tgt; 887 int rc; 888 889 dev_dbg(dev->dev, "%s: modulation=%d\n", 890 __func__, dev->poll_mod_curr); 891 892 if (tg != 1) 893 return -EPROTO; 894 895 memset(&nfc_tgt, 0, sizeof(struct nfc_target)); 896 897 switch (dev->poll_mod_curr) { 898 case PN533_POLL_MOD_106KBPS_A: 899 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len); 900 break; 901 case PN533_POLL_MOD_212KBPS_FELICA: 902 case PN533_POLL_MOD_424KBPS_FELICA: 903 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len); 904 break; 905 case PN533_POLL_MOD_106KBPS_JEWEL: 906 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len); 907 break; 908 case PN533_POLL_MOD_847KBPS_B: 909 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len); 910 break; 911 default: 912 nfc_err(dev->dev, 913 "Unknown current poll modulation\n"); 914 return -EPROTO; 915 } 916 917 if (rc) 918 return rc; 919 920 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) { 921 dev_dbg(dev->dev, 922 "The Tg found doesn't have the desired protocol\n"); 923 return -EAGAIN; 924 } 925 926 dev_dbg(dev->dev, 927 "Target found - supported protocols: 0x%x\n", 928 nfc_tgt.supported_protocols); 929 930 dev->tgt_available_prots = nfc_tgt.supported_protocols; 931 932 pn533_poll_reset_mod_list(dev); 933 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1); 934 935 return 0; 936 } 937 938 static inline void pn533_poll_next_mod(struct pn533 *dev) 939 { 940 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count; 941 } 942 943 static void pn533_poll_reset_mod_list(struct pn533 *dev) 944 { 945 dev->poll_mod_count = 0; 946 } 947 948 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index) 949 { 950 dev->poll_mod_active[dev->poll_mod_count] = 951 (struct pn533_poll_modulations *)&poll_mod[mod_index]; 952 dev->poll_mod_count++; 953 } 954 955 static void pn533_poll_create_mod_list(struct pn533 *dev, 956 u32 im_protocols, u32 tm_protocols) 957 { 958 pn533_poll_reset_mod_list(dev); 959 960 if ((im_protocols & NFC_PROTO_MIFARE_MASK) || 961 (im_protocols & NFC_PROTO_ISO14443_MASK) || 962 (im_protocols & NFC_PROTO_NFC_DEP_MASK)) 963 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A); 964 965 if (im_protocols & NFC_PROTO_FELICA_MASK || 966 im_protocols & NFC_PROTO_NFC_DEP_MASK) { 967 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA); 968 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA); 969 } 970 971 if (im_protocols & NFC_PROTO_JEWEL_MASK) 972 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL); 973 974 if (im_protocols & NFC_PROTO_ISO14443_B_MASK) 975 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B); 976 977 if (tm_protocols) 978 pn533_poll_add_mod(dev, PN533_LISTEN_MOD); 979 } 980 981 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp) 982 { 983 u8 nbtg, tg, *tgdata; 984 int rc, tgdata_len; 985 986 /* Toggle the DEP polling */ 987 if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) 988 dev->poll_dep = 1; 989 990 nbtg = resp->data[0]; 991 tg = resp->data[1]; 992 tgdata = &resp->data[2]; 993 tgdata_len = resp->len - 2; /* nbtg + tg */ 994 995 if (nbtg) { 996 rc = pn533_target_found(dev, tg, tgdata, tgdata_len); 997 998 /* We must stop the poll after a valid target found */ 999 if (rc == 0) 1000 return 0; 1001 } 1002 1003 return -EAGAIN; 1004 } 1005 1006 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev) 1007 { 1008 struct sk_buff *skb; 1009 u8 *felica, *nfcid3; 1010 1011 u8 *gbytes = dev->gb; 1012 size_t gbytes_len = dev->gb_len; 1013 1014 u8 felica_params[18] = {0x1, 0xfe, /* DEP */ 1015 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */ 1016 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 1017 0xff, 0xff}; /* System code */ 1018 1019 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */ 1020 0x0, 0x0, 0x0, 1021 0x40}; /* SEL_RES for DEP */ 1022 1023 unsigned int skb_len = 36 + /* 1024 * mode (1), mifare (6), 1025 * felica (18), nfcid3 (10), gb_len (1) 1026 */ 1027 gbytes_len + 1028 1; /* len Tk*/ 1029 1030 skb = pn533_alloc_skb(dev, skb_len); 1031 if (!skb) 1032 return NULL; 1033 1034 /* DEP support only */ 1035 skb_put_u8(skb, PN533_INIT_TARGET_DEP); 1036 1037 /* MIFARE params */ 1038 skb_put_data(skb, mifare_params, 6); 1039 1040 /* Felica params */ 1041 felica = skb_put_data(skb, felica_params, 18); 1042 get_random_bytes(felica + 2, 6); 1043 1044 /* NFCID3 */ 1045 nfcid3 = skb_put_zero(skb, 10); 1046 memcpy(nfcid3, felica, 8); 1047 1048 /* General bytes */ 1049 skb_put_u8(skb, gbytes_len); 1050 1051 skb_put_data(skb, gbytes, gbytes_len); 1052 1053 /* Len Tk */ 1054 skb_put_u8(skb, 0); 1055 1056 return skb; 1057 } 1058 1059 static void pn533_wq_tm_mi_recv(struct work_struct *work); 1060 static struct sk_buff *pn533_build_response(struct pn533 *dev); 1061 1062 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg, 1063 struct sk_buff *resp) 1064 { 1065 struct sk_buff *skb; 1066 u8 status, ret, mi; 1067 int rc; 1068 1069 dev_dbg(dev->dev, "%s\n", __func__); 1070 1071 if (IS_ERR(resp)) { 1072 skb_queue_purge(&dev->resp_q); 1073 return PTR_ERR(resp); 1074 } 1075 1076 status = resp->data[0]; 1077 1078 ret = status & PN533_CMD_RET_MASK; 1079 mi = status & PN533_CMD_MI_MASK; 1080 1081 skb_pull(resp, sizeof(status)); 1082 1083 if (ret != PN533_CMD_RET_SUCCESS) { 1084 rc = -EIO; 1085 goto error; 1086 } 1087 1088 skb_queue_tail(&dev->resp_q, resp); 1089 1090 if (mi) { 1091 queue_work(dev->wq, &dev->mi_tm_rx_work); 1092 return -EINPROGRESS; 1093 } 1094 1095 skb = pn533_build_response(dev); 1096 if (!skb) { 1097 rc = -EIO; 1098 goto error; 1099 } 1100 1101 return nfc_tm_data_received(dev->nfc_dev, skb); 1102 1103 error: 1104 nfc_tm_deactivated(dev->nfc_dev); 1105 dev->tgt_mode = 0; 1106 skb_queue_purge(&dev->resp_q); 1107 dev_kfree_skb(resp); 1108 1109 return rc; 1110 } 1111 1112 static void pn533_wq_tm_mi_recv(struct work_struct *work) 1113 { 1114 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work); 1115 struct sk_buff *skb; 1116 int rc; 1117 1118 dev_dbg(dev->dev, "%s\n", __func__); 1119 1120 skb = pn533_alloc_skb(dev, 0); 1121 if (!skb) 1122 return; 1123 1124 rc = pn533_send_cmd_direct_async(dev, 1125 PN533_CMD_TG_GET_DATA, 1126 skb, 1127 pn533_tm_get_data_complete, 1128 NULL); 1129 1130 if (rc < 0) 1131 dev_kfree_skb(skb); 1132 } 1133 1134 static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 1135 struct sk_buff *resp); 1136 static void pn533_wq_tm_mi_send(struct work_struct *work) 1137 { 1138 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work); 1139 struct sk_buff *skb; 1140 int rc; 1141 1142 dev_dbg(dev->dev, "%s\n", __func__); 1143 1144 /* Grab the first skb in the queue */ 1145 skb = skb_dequeue(&dev->fragment_skb); 1146 if (skb == NULL) { /* No more data */ 1147 /* Reset the queue for future use */ 1148 skb_queue_head_init(&dev->fragment_skb); 1149 goto error; 1150 } 1151 1152 /* last entry - remove MI bit */ 1153 if (skb_queue_len(&dev->fragment_skb) == 0) { 1154 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA, 1155 skb, pn533_tm_send_complete, NULL); 1156 } else 1157 rc = pn533_send_cmd_direct_async(dev, 1158 PN533_CMD_TG_SET_META_DATA, 1159 skb, pn533_tm_send_complete, NULL); 1160 1161 if (rc == 0) /* success */ 1162 return; 1163 1164 dev_err(dev->dev, 1165 "Error %d when trying to perform set meta data_exchange", rc); 1166 1167 dev_kfree_skb(skb); 1168 1169 error: 1170 dev->phy_ops->send_ack(dev, GFP_KERNEL); 1171 queue_work(dev->wq, &dev->cmd_work); 1172 } 1173 1174 static void pn533_wq_tg_get_data(struct work_struct *work) 1175 { 1176 struct pn533 *dev = container_of(work, struct pn533, tg_work); 1177 struct sk_buff *skb; 1178 int rc; 1179 1180 dev_dbg(dev->dev, "%s\n", __func__); 1181 1182 skb = pn533_alloc_skb(dev, 0); 1183 if (!skb) 1184 return; 1185 1186 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb, 1187 pn533_tm_get_data_complete, NULL); 1188 1189 if (rc < 0) 1190 dev_kfree_skb(skb); 1191 } 1192 1193 #define ATR_REQ_GB_OFFSET 17 1194 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp) 1195 { 1196 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb; 1197 size_t gb_len; 1198 int rc; 1199 1200 dev_dbg(dev->dev, "%s\n", __func__); 1201 1202 if (resp->len < ATR_REQ_GB_OFFSET + 1) 1203 return -EINVAL; 1204 1205 mode = resp->data[0]; 1206 cmd = &resp->data[1]; 1207 1208 dev_dbg(dev->dev, "Target mode 0x%x len %d\n", 1209 mode, resp->len); 1210 1211 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) == 1212 PN533_INIT_TARGET_RESP_ACTIVE) 1213 comm_mode = NFC_COMM_ACTIVE; 1214 1215 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */ 1216 return -EOPNOTSUPP; 1217 1218 gb = cmd + ATR_REQ_GB_OFFSET; 1219 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1); 1220 1221 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, 1222 comm_mode, gb, gb_len); 1223 if (rc < 0) { 1224 nfc_err(dev->dev, 1225 "Error when signaling target activation\n"); 1226 return rc; 1227 } 1228 1229 dev->tgt_mode = 1; 1230 queue_work(dev->wq, &dev->tg_work); 1231 1232 return 0; 1233 } 1234 1235 static void pn533_listen_mode_timer(struct timer_list *t) 1236 { 1237 struct pn533 *dev = from_timer(dev, t, listen_timer); 1238 1239 dev_dbg(dev->dev, "Listen mode timeout\n"); 1240 1241 dev->cancel_listen = 1; 1242 1243 pn533_poll_next_mod(dev); 1244 1245 queue_delayed_work(dev->wq, &dev->poll_work, 1246 msecs_to_jiffies(PN533_POLL_INTERVAL)); 1247 } 1248 1249 static int pn533_rf_complete(struct pn533 *dev, void *arg, 1250 struct sk_buff *resp) 1251 { 1252 int rc = 0; 1253 1254 dev_dbg(dev->dev, "%s\n", __func__); 1255 1256 if (IS_ERR(resp)) { 1257 rc = PTR_ERR(resp); 1258 1259 nfc_err(dev->dev, "RF setting error %d\n", rc); 1260 1261 return rc; 1262 } 1263 1264 queue_delayed_work(dev->wq, &dev->poll_work, 1265 msecs_to_jiffies(PN533_POLL_INTERVAL)); 1266 1267 dev_kfree_skb(resp); 1268 return rc; 1269 } 1270 1271 static void pn533_wq_rf(struct work_struct *work) 1272 { 1273 struct pn533 *dev = container_of(work, struct pn533, rf_work); 1274 struct sk_buff *skb; 1275 int rc; 1276 1277 dev_dbg(dev->dev, "%s\n", __func__); 1278 1279 skb = pn533_alloc_skb(dev, 2); 1280 if (!skb) 1281 return; 1282 1283 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD); 1284 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA); 1285 1286 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb, 1287 pn533_rf_complete, NULL); 1288 if (rc < 0) { 1289 dev_kfree_skb(skb); 1290 nfc_err(dev->dev, "RF setting error %d\n", rc); 1291 } 1292 } 1293 1294 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg, 1295 struct sk_buff *resp) 1296 { 1297 struct pn533_cmd_jump_dep_response *rsp; 1298 struct nfc_target nfc_target; 1299 u8 target_gt_len; 1300 int rc; 1301 1302 if (IS_ERR(resp)) 1303 return PTR_ERR(resp); 1304 1305 rsp = (struct pn533_cmd_jump_dep_response *)resp->data; 1306 1307 rc = rsp->status & PN533_CMD_RET_MASK; 1308 if (rc != PN533_CMD_RET_SUCCESS) { 1309 /* Not target found, turn radio off */ 1310 queue_work(dev->wq, &dev->rf_work); 1311 1312 dev_kfree_skb(resp); 1313 return 0; 1314 } 1315 1316 dev_dbg(dev->dev, "Creating new target"); 1317 1318 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; 1319 nfc_target.nfcid1_len = 10; 1320 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len); 1321 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); 1322 if (rc) 1323 goto error; 1324 1325 dev->tgt_available_prots = 0; 1326 dev->tgt_active_prot = NFC_PROTO_NFC_DEP; 1327 1328 /* ATR_RES general bytes are located at offset 17 */ 1329 target_gt_len = resp->len - 17; 1330 rc = nfc_set_remote_general_bytes(dev->nfc_dev, 1331 rsp->gt, target_gt_len); 1332 if (!rc) { 1333 rc = nfc_dep_link_is_up(dev->nfc_dev, 1334 dev->nfc_dev->targets[0].idx, 1335 0, NFC_RF_INITIATOR); 1336 1337 if (!rc) 1338 pn533_poll_reset_mod_list(dev); 1339 } 1340 error: 1341 dev_kfree_skb(resp); 1342 return rc; 1343 } 1344 1345 #define PASSIVE_DATA_LEN 5 1346 static int pn533_poll_dep(struct nfc_dev *nfc_dev) 1347 { 1348 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1349 struct sk_buff *skb; 1350 int rc, skb_len; 1351 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE]; 1352 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3}; 1353 1354 dev_dbg(dev->dev, "%s", __func__); 1355 1356 if (!dev->gb) { 1357 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len); 1358 1359 if (!dev->gb || !dev->gb_len) { 1360 dev->poll_dep = 0; 1361 queue_work(dev->wq, &dev->rf_work); 1362 } 1363 } 1364 1365 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */ 1366 skb_len += PASSIVE_DATA_LEN; 1367 1368 /* NFCID3 */ 1369 skb_len += NFC_NFCID3_MAXSIZE; 1370 nfcid3[0] = 0x1; 1371 nfcid3[1] = 0xfe; 1372 get_random_bytes(nfcid3 + 2, 6); 1373 1374 skb = pn533_alloc_skb(dev, skb_len); 1375 if (!skb) 1376 return -ENOMEM; 1377 1378 skb_put_u8(skb, 0x01); /* Active */ 1379 skb_put_u8(skb, 0x02); /* 424 kbps */ 1380 1381 next = skb_put(skb, 1); /* Next */ 1382 *next = 0; 1383 1384 /* Copy passive data */ 1385 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN); 1386 *next |= 1; 1387 1388 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */ 1389 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE); 1390 *next |= 2; 1391 1392 skb_put_data(skb, dev->gb, dev->gb_len); 1393 *next |= 4; /* We have some Gi */ 1394 1395 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb, 1396 pn533_poll_dep_complete, NULL); 1397 1398 if (rc < 0) 1399 dev_kfree_skb(skb); 1400 1401 return rc; 1402 } 1403 1404 static int pn533_poll_complete(struct pn533 *dev, void *arg, 1405 struct sk_buff *resp) 1406 { 1407 struct pn533_poll_modulations *cur_mod; 1408 int rc; 1409 1410 dev_dbg(dev->dev, "%s\n", __func__); 1411 1412 if (IS_ERR(resp)) { 1413 rc = PTR_ERR(resp); 1414 1415 nfc_err(dev->dev, "%s Poll complete error %d\n", 1416 __func__, rc); 1417 1418 if (rc == -ENOENT) { 1419 if (dev->poll_mod_count != 0) 1420 return rc; 1421 goto stop_poll; 1422 } else if (rc < 0) { 1423 nfc_err(dev->dev, 1424 "Error %d when running poll\n", rc); 1425 goto stop_poll; 1426 } 1427 } 1428 1429 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1430 1431 if (cur_mod->len == 0) { /* Target mode */ 1432 del_timer(&dev->listen_timer); 1433 rc = pn533_init_target_complete(dev, resp); 1434 goto done; 1435 } 1436 1437 /* Initiator mode */ 1438 rc = pn533_start_poll_complete(dev, resp); 1439 if (!rc) 1440 goto done; 1441 1442 if (!dev->poll_mod_count) { 1443 dev_dbg(dev->dev, "Polling has been stopped\n"); 1444 goto done; 1445 } 1446 1447 pn533_poll_next_mod(dev); 1448 /* Not target found, turn radio off */ 1449 queue_work(dev->wq, &dev->rf_work); 1450 1451 done: 1452 dev_kfree_skb(resp); 1453 return rc; 1454 1455 stop_poll: 1456 nfc_err(dev->dev, "Polling operation has been stopped\n"); 1457 1458 pn533_poll_reset_mod_list(dev); 1459 dev->poll_protocols = 0; 1460 return rc; 1461 } 1462 1463 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev, 1464 struct pn533_poll_modulations *mod) 1465 { 1466 struct sk_buff *skb; 1467 1468 skb = pn533_alloc_skb(dev, mod->len); 1469 if (!skb) 1470 return NULL; 1471 1472 skb_put_data(skb, &mod->data, mod->len); 1473 1474 return skb; 1475 } 1476 1477 static int pn533_send_poll_frame(struct pn533 *dev) 1478 { 1479 struct pn533_poll_modulations *mod; 1480 struct sk_buff *skb; 1481 int rc; 1482 u8 cmd_code; 1483 1484 mod = dev->poll_mod_active[dev->poll_mod_curr]; 1485 1486 dev_dbg(dev->dev, "%s mod len %d\n", 1487 __func__, mod->len); 1488 1489 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) { 1490 dev->poll_dep = 0; 1491 return pn533_poll_dep(dev->nfc_dev); 1492 } 1493 1494 if (mod->len == 0) { /* Listen mode */ 1495 cmd_code = PN533_CMD_TG_INIT_AS_TARGET; 1496 skb = pn533_alloc_poll_tg_frame(dev); 1497 } else { /* Polling mode */ 1498 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET; 1499 skb = pn533_alloc_poll_in_frame(dev, mod); 1500 } 1501 1502 if (!skb) { 1503 nfc_err(dev->dev, "Failed to allocate skb\n"); 1504 return -ENOMEM; 1505 } 1506 1507 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete, 1508 NULL); 1509 if (rc < 0) { 1510 dev_kfree_skb(skb); 1511 nfc_err(dev->dev, "Polling loop error %d\n", rc); 1512 } 1513 1514 return rc; 1515 } 1516 1517 static void pn533_wq_poll(struct work_struct *work) 1518 { 1519 struct pn533 *dev = container_of(work, struct pn533, poll_work.work); 1520 struct pn533_poll_modulations *cur_mod; 1521 int rc; 1522 1523 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1524 1525 dev_dbg(dev->dev, 1526 "%s cancel_listen %d modulation len %d\n", 1527 __func__, dev->cancel_listen, cur_mod->len); 1528 1529 if (dev->cancel_listen == 1) { 1530 dev->cancel_listen = 0; 1531 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC); 1532 } 1533 1534 rc = pn533_send_poll_frame(dev); 1535 if (rc) 1536 return; 1537 1538 if (cur_mod->len == 0 && dev->poll_mod_count > 1) 1539 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ); 1540 } 1541 1542 static int pn533_start_poll(struct nfc_dev *nfc_dev, 1543 u32 im_protocols, u32 tm_protocols) 1544 { 1545 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1546 struct pn533_poll_modulations *cur_mod; 1547 u8 rand_mod; 1548 int rc; 1549 1550 dev_dbg(dev->dev, 1551 "%s: im protocols 0x%x tm protocols 0x%x\n", 1552 __func__, im_protocols, tm_protocols); 1553 1554 if (dev->tgt_active_prot) { 1555 nfc_err(dev->dev, 1556 "Cannot poll with a target already activated\n"); 1557 return -EBUSY; 1558 } 1559 1560 if (dev->tgt_mode) { 1561 nfc_err(dev->dev, 1562 "Cannot poll while already being activated\n"); 1563 return -EBUSY; 1564 } 1565 1566 if (tm_protocols) { 1567 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len); 1568 if (dev->gb == NULL) 1569 tm_protocols = 0; 1570 } 1571 1572 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols); 1573 dev->poll_protocols = im_protocols; 1574 dev->listen_protocols = tm_protocols; 1575 1576 /* Do not always start polling from the same modulation */ 1577 get_random_bytes(&rand_mod, sizeof(rand_mod)); 1578 rand_mod %= dev->poll_mod_count; 1579 dev->poll_mod_curr = rand_mod; 1580 1581 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1582 1583 rc = pn533_send_poll_frame(dev); 1584 1585 /* Start listen timer */ 1586 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1) 1587 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ); 1588 1589 return rc; 1590 } 1591 1592 static void pn533_stop_poll(struct nfc_dev *nfc_dev) 1593 { 1594 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1595 1596 del_timer(&dev->listen_timer); 1597 1598 if (!dev->poll_mod_count) { 1599 dev_dbg(dev->dev, 1600 "Polling operation was not running\n"); 1601 return; 1602 } 1603 1604 dev->phy_ops->abort_cmd(dev, GFP_KERNEL); 1605 flush_delayed_work(&dev->poll_work); 1606 pn533_poll_reset_mod_list(dev); 1607 } 1608 1609 static int pn533_activate_target_nfcdep(struct pn533 *dev) 1610 { 1611 struct pn533_cmd_activate_response *rsp; 1612 u16 gt_len; 1613 int rc; 1614 struct sk_buff *skb; 1615 struct sk_buff *resp; 1616 1617 dev_dbg(dev->dev, "%s\n", __func__); 1618 1619 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/ 1620 if (!skb) 1621 return -ENOMEM; 1622 1623 skb_put_u8(skb, 1); /* TG */ 1624 skb_put_u8(skb, 0); /* Next */ 1625 1626 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb); 1627 if (IS_ERR(resp)) 1628 return PTR_ERR(resp); 1629 1630 rsp = (struct pn533_cmd_activate_response *)resp->data; 1631 rc = rsp->status & PN533_CMD_RET_MASK; 1632 if (rc != PN533_CMD_RET_SUCCESS) { 1633 nfc_err(dev->dev, 1634 "Target activation failed (error 0x%x)\n", rc); 1635 dev_kfree_skb(resp); 1636 return -EIO; 1637 } 1638 1639 /* ATR_RES general bytes are located at offset 16 */ 1640 gt_len = resp->len - 16; 1641 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len); 1642 1643 dev_kfree_skb(resp); 1644 return rc; 1645 } 1646 1647 static int pn533_activate_target(struct nfc_dev *nfc_dev, 1648 struct nfc_target *target, u32 protocol) 1649 { 1650 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1651 int rc; 1652 1653 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol); 1654 1655 if (dev->poll_mod_count) { 1656 nfc_err(dev->dev, 1657 "Cannot activate while polling\n"); 1658 return -EBUSY; 1659 } 1660 1661 if (dev->tgt_active_prot) { 1662 nfc_err(dev->dev, 1663 "There is already an active target\n"); 1664 return -EBUSY; 1665 } 1666 1667 if (!dev->tgt_available_prots) { 1668 nfc_err(dev->dev, 1669 "There is no available target to activate\n"); 1670 return -EINVAL; 1671 } 1672 1673 if (!(dev->tgt_available_prots & (1 << protocol))) { 1674 nfc_err(dev->dev, 1675 "Target doesn't support requested proto %u\n", 1676 protocol); 1677 return -EINVAL; 1678 } 1679 1680 if (protocol == NFC_PROTO_NFC_DEP) { 1681 rc = pn533_activate_target_nfcdep(dev); 1682 if (rc) { 1683 nfc_err(dev->dev, 1684 "Activating target with DEP failed %d\n", rc); 1685 return rc; 1686 } 1687 } 1688 1689 dev->tgt_active_prot = protocol; 1690 dev->tgt_available_prots = 0; 1691 1692 return 0; 1693 } 1694 1695 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg, 1696 struct sk_buff *resp) 1697 { 1698 int rc = 0; 1699 1700 dev_dbg(dev->dev, "%s\n", __func__); 1701 1702 if (IS_ERR(resp)) { 1703 rc = PTR_ERR(resp); 1704 1705 nfc_err(dev->dev, "Target release error %d\n", rc); 1706 1707 return rc; 1708 } 1709 1710 rc = resp->data[0] & PN533_CMD_RET_MASK; 1711 if (rc != PN533_CMD_RET_SUCCESS) 1712 nfc_err(dev->dev, 1713 "Error 0x%x when releasing the target\n", rc); 1714 1715 dev_kfree_skb(resp); 1716 return rc; 1717 } 1718 1719 static void pn533_deactivate_target(struct nfc_dev *nfc_dev, 1720 struct nfc_target *target, u8 mode) 1721 { 1722 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1723 struct sk_buff *skb; 1724 int rc; 1725 1726 dev_dbg(dev->dev, "%s\n", __func__); 1727 1728 if (!dev->tgt_active_prot) { 1729 nfc_err(dev->dev, "There is no active target\n"); 1730 return; 1731 } 1732 1733 dev->tgt_active_prot = 0; 1734 skb_queue_purge(&dev->resp_q); 1735 1736 skb = pn533_alloc_skb(dev, sizeof(u8)); 1737 if (!skb) 1738 return; 1739 1740 skb_put_u8(skb, 1); /* TG*/ 1741 1742 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb, 1743 pn533_deactivate_target_complete, NULL); 1744 if (rc < 0) { 1745 dev_kfree_skb(skb); 1746 nfc_err(dev->dev, "Target release error %d\n", rc); 1747 } 1748 } 1749 1750 1751 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg, 1752 struct sk_buff *resp) 1753 { 1754 struct pn533_cmd_jump_dep_response *rsp; 1755 u8 target_gt_len; 1756 int rc; 1757 u8 active = *(u8 *)arg; 1758 1759 kfree(arg); 1760 1761 if (IS_ERR(resp)) 1762 return PTR_ERR(resp); 1763 1764 if (dev->tgt_available_prots && 1765 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) { 1766 nfc_err(dev->dev, 1767 "The target does not support DEP\n"); 1768 rc = -EINVAL; 1769 goto error; 1770 } 1771 1772 rsp = (struct pn533_cmd_jump_dep_response *)resp->data; 1773 1774 rc = rsp->status & PN533_CMD_RET_MASK; 1775 if (rc != PN533_CMD_RET_SUCCESS) { 1776 nfc_err(dev->dev, 1777 "Bringing DEP link up failed (error 0x%x)\n", rc); 1778 goto error; 1779 } 1780 1781 if (!dev->tgt_available_prots) { 1782 struct nfc_target nfc_target; 1783 1784 dev_dbg(dev->dev, "Creating new target\n"); 1785 1786 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; 1787 nfc_target.nfcid1_len = 10; 1788 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len); 1789 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); 1790 if (rc) 1791 goto error; 1792 1793 dev->tgt_available_prots = 0; 1794 } 1795 1796 dev->tgt_active_prot = NFC_PROTO_NFC_DEP; 1797 1798 /* ATR_RES general bytes are located at offset 17 */ 1799 target_gt_len = resp->len - 17; 1800 rc = nfc_set_remote_general_bytes(dev->nfc_dev, 1801 rsp->gt, target_gt_len); 1802 if (rc == 0) 1803 rc = nfc_dep_link_is_up(dev->nfc_dev, 1804 dev->nfc_dev->targets[0].idx, 1805 !active, NFC_RF_INITIATOR); 1806 1807 error: 1808 dev_kfree_skb(resp); 1809 return rc; 1810 } 1811 1812 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf); 1813 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 1814 u8 comm_mode, u8 *gb, size_t gb_len) 1815 { 1816 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1817 struct sk_buff *skb; 1818 int rc, skb_len; 1819 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE]; 1820 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3}; 1821 1822 dev_dbg(dev->dev, "%s\n", __func__); 1823 1824 if (dev->poll_mod_count) { 1825 nfc_err(dev->dev, 1826 "Cannot bring the DEP link up while polling\n"); 1827 return -EBUSY; 1828 } 1829 1830 if (dev->tgt_active_prot) { 1831 nfc_err(dev->dev, 1832 "There is already an active target\n"); 1833 return -EBUSY; 1834 } 1835 1836 skb_len = 3 + gb_len; /* ActPass + BR + Next */ 1837 skb_len += PASSIVE_DATA_LEN; 1838 1839 /* NFCID3 */ 1840 skb_len += NFC_NFCID3_MAXSIZE; 1841 if (target && !target->nfcid2_len) { 1842 nfcid3[0] = 0x1; 1843 nfcid3[1] = 0xfe; 1844 get_random_bytes(nfcid3 + 2, 6); 1845 } 1846 1847 skb = pn533_alloc_skb(dev, skb_len); 1848 if (!skb) 1849 return -ENOMEM; 1850 1851 skb_put_u8(skb, !comm_mode); /* ActPass */ 1852 skb_put_u8(skb, 0x02); /* 424 kbps */ 1853 1854 next = skb_put(skb, 1); /* Next */ 1855 *next = 0; 1856 1857 /* Copy passive data */ 1858 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN); 1859 *next |= 1; 1860 1861 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */ 1862 if (target && target->nfcid2_len) 1863 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2, 1864 target->nfcid2_len); 1865 else 1866 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE); 1867 *next |= 2; 1868 1869 if (gb != NULL && gb_len > 0) { 1870 skb_put_data(skb, gb, gb_len); 1871 *next |= 4; /* We have some Gi */ 1872 } else { 1873 *next = 0; 1874 } 1875 1876 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 1877 if (!arg) { 1878 dev_kfree_skb(skb); 1879 return -ENOMEM; 1880 } 1881 1882 *arg = !comm_mode; 1883 1884 pn533_rf_field(dev->nfc_dev, 0); 1885 1886 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb, 1887 pn533_in_dep_link_up_complete, arg); 1888 1889 if (rc < 0) { 1890 dev_kfree_skb(skb); 1891 kfree(arg); 1892 } 1893 1894 return rc; 1895 } 1896 1897 static int pn533_dep_link_down(struct nfc_dev *nfc_dev) 1898 { 1899 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1900 1901 dev_dbg(dev->dev, "%s\n", __func__); 1902 1903 pn533_poll_reset_mod_list(dev); 1904 1905 if (dev->tgt_mode || dev->tgt_active_prot) 1906 dev->phy_ops->abort_cmd(dev, GFP_KERNEL); 1907 1908 dev->tgt_active_prot = 0; 1909 dev->tgt_mode = 0; 1910 1911 skb_queue_purge(&dev->resp_q); 1912 1913 return 0; 1914 } 1915 1916 struct pn533_data_exchange_arg { 1917 data_exchange_cb_t cb; 1918 void *cb_context; 1919 }; 1920 1921 static struct sk_buff *pn533_build_response(struct pn533 *dev) 1922 { 1923 struct sk_buff *skb, *tmp, *t; 1924 unsigned int skb_len = 0, tmp_len = 0; 1925 1926 dev_dbg(dev->dev, "%s\n", __func__); 1927 1928 if (skb_queue_empty(&dev->resp_q)) 1929 return NULL; 1930 1931 if (skb_queue_len(&dev->resp_q) == 1) { 1932 skb = skb_dequeue(&dev->resp_q); 1933 goto out; 1934 } 1935 1936 skb_queue_walk_safe(&dev->resp_q, tmp, t) 1937 skb_len += tmp->len; 1938 1939 dev_dbg(dev->dev, "%s total length %d\n", 1940 __func__, skb_len); 1941 1942 skb = alloc_skb(skb_len, GFP_KERNEL); 1943 if (skb == NULL) 1944 goto out; 1945 1946 skb_put(skb, skb_len); 1947 1948 skb_queue_walk_safe(&dev->resp_q, tmp, t) { 1949 memcpy(skb->data + tmp_len, tmp->data, tmp->len); 1950 tmp_len += tmp->len; 1951 } 1952 1953 out: 1954 skb_queue_purge(&dev->resp_q); 1955 1956 return skb; 1957 } 1958 1959 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg, 1960 struct sk_buff *resp) 1961 { 1962 struct pn533_data_exchange_arg *arg = _arg; 1963 struct sk_buff *skb; 1964 int rc = 0; 1965 u8 status, ret, mi; 1966 1967 dev_dbg(dev->dev, "%s\n", __func__); 1968 1969 if (IS_ERR(resp)) { 1970 rc = PTR_ERR(resp); 1971 goto _error; 1972 } 1973 1974 status = resp->data[0]; 1975 ret = status & PN533_CMD_RET_MASK; 1976 mi = status & PN533_CMD_MI_MASK; 1977 1978 skb_pull(resp, sizeof(status)); 1979 1980 if (ret != PN533_CMD_RET_SUCCESS) { 1981 nfc_err(dev->dev, 1982 "Exchanging data failed (error 0x%x)\n", ret); 1983 rc = -EIO; 1984 goto error; 1985 } 1986 1987 skb_queue_tail(&dev->resp_q, resp); 1988 1989 if (mi) { 1990 dev->cmd_complete_mi_arg = arg; 1991 queue_work(dev->wq, &dev->mi_rx_work); 1992 return -EINPROGRESS; 1993 } 1994 1995 /* Prepare for the next round */ 1996 if (skb_queue_len(&dev->fragment_skb) > 0) { 1997 dev->cmd_complete_dep_arg = arg; 1998 queue_work(dev->wq, &dev->mi_tx_work); 1999 2000 return -EINPROGRESS; 2001 } 2002 2003 skb = pn533_build_response(dev); 2004 if (!skb) { 2005 rc = -ENOMEM; 2006 goto error; 2007 } 2008 2009 arg->cb(arg->cb_context, skb, 0); 2010 kfree(arg); 2011 return 0; 2012 2013 error: 2014 dev_kfree_skb(resp); 2015 _error: 2016 skb_queue_purge(&dev->resp_q); 2017 arg->cb(arg->cb_context, NULL, rc); 2018 kfree(arg); 2019 return rc; 2020 } 2021 2022 /* 2023 * Receive an incoming pn533 frame. skb contains only header and payload. 2024 * If skb == NULL, it is a notification that the link below is dead. 2025 */ 2026 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status) 2027 { 2028 if (!dev->cmd) 2029 goto sched_wq; 2030 2031 dev->cmd->status = status; 2032 2033 if (status != 0) { 2034 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status); 2035 goto sched_wq; 2036 } 2037 2038 if (skb == NULL) { 2039 pr_err("NULL Frame -> link is dead\n"); 2040 goto sched_wq; 2041 } 2042 2043 if (pn533_rx_frame_is_ack(skb->data)) { 2044 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__); 2045 dev_kfree_skb(skb); 2046 return; 2047 } 2048 2049 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data, 2050 dev->ops->rx_frame_size(skb->data), false); 2051 2052 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) { 2053 nfc_err(dev->dev, "Received an invalid frame\n"); 2054 dev->cmd->status = -EIO; 2055 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) { 2056 nfc_err(dev->dev, "It it not the response to the last command\n"); 2057 dev->cmd->status = -EIO; 2058 } 2059 2060 dev->cmd->resp = skb; 2061 2062 sched_wq: 2063 queue_work(dev->wq, &dev->cmd_complete_work); 2064 } 2065 EXPORT_SYMBOL(pn533_recv_frame); 2066 2067 /* Split the Tx skb into small chunks */ 2068 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb) 2069 { 2070 struct sk_buff *frag; 2071 int frag_size; 2072 2073 do { 2074 /* Remaining size */ 2075 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN) 2076 frag_size = PN533_CMD_DATAFRAME_MAXLEN; 2077 else 2078 frag_size = skb->len; 2079 2080 /* Allocate and reserve */ 2081 frag = pn533_alloc_skb(dev, frag_size); 2082 if (!frag) { 2083 skb_queue_purge(&dev->fragment_skb); 2084 break; 2085 } 2086 2087 if (!dev->tgt_mode) { 2088 /* Reserve the TG/MI byte */ 2089 skb_reserve(frag, 1); 2090 2091 /* MI + TG */ 2092 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN) 2093 *(u8 *)skb_push(frag, sizeof(u8)) = 2094 (PN533_CMD_MI_MASK | 1); 2095 else 2096 *(u8 *)skb_push(frag, sizeof(u8)) = 1; /* TG */ 2097 } 2098 2099 skb_put_data(frag, skb->data, frag_size); 2100 2101 /* Reduce the size of incoming buffer */ 2102 skb_pull(skb, frag_size); 2103 2104 /* Add this to skb_queue */ 2105 skb_queue_tail(&dev->fragment_skb, frag); 2106 2107 } while (skb->len > 0); 2108 2109 dev_kfree_skb(skb); 2110 2111 return skb_queue_len(&dev->fragment_skb); 2112 } 2113 2114 static int pn533_transceive(struct nfc_dev *nfc_dev, 2115 struct nfc_target *target, struct sk_buff *skb, 2116 data_exchange_cb_t cb, void *cb_context) 2117 { 2118 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2119 struct pn533_data_exchange_arg *arg = NULL; 2120 int rc; 2121 2122 dev_dbg(dev->dev, "%s\n", __func__); 2123 2124 if (!dev->tgt_active_prot) { 2125 nfc_err(dev->dev, 2126 "Can't exchange data if there is no active target\n"); 2127 rc = -EINVAL; 2128 goto error; 2129 } 2130 2131 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 2132 if (!arg) { 2133 rc = -ENOMEM; 2134 goto error; 2135 } 2136 2137 arg->cb = cb; 2138 arg->cb_context = cb_context; 2139 2140 switch (dev->device_type) { 2141 case PN533_DEVICE_PASORI: 2142 if (dev->tgt_active_prot == NFC_PROTO_FELICA) { 2143 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU, 2144 skb, 2145 pn533_data_exchange_complete, 2146 arg); 2147 2148 break; 2149 } 2150 default: 2151 /* jumbo frame ? */ 2152 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { 2153 rc = pn533_fill_fragment_skbs(dev, skb); 2154 if (rc <= 0) 2155 goto error; 2156 2157 skb = skb_dequeue(&dev->fragment_skb); 2158 if (!skb) { 2159 rc = -EIO; 2160 goto error; 2161 } 2162 } else { 2163 *(u8 *)skb_push(skb, sizeof(u8)) = 1; /* TG */ 2164 } 2165 2166 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE, 2167 skb, pn533_data_exchange_complete, 2168 arg); 2169 2170 break; 2171 } 2172 2173 if (rc < 0) /* rc from send_async */ 2174 goto error; 2175 2176 return 0; 2177 2178 error: 2179 kfree(arg); 2180 dev_kfree_skb(skb); 2181 return rc; 2182 } 2183 2184 static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 2185 struct sk_buff *resp) 2186 { 2187 u8 status; 2188 2189 dev_dbg(dev->dev, "%s\n", __func__); 2190 2191 if (IS_ERR(resp)) 2192 return PTR_ERR(resp); 2193 2194 status = resp->data[0]; 2195 2196 /* Prepare for the next round */ 2197 if (skb_queue_len(&dev->fragment_skb) > 0) { 2198 queue_work(dev->wq, &dev->mi_tm_tx_work); 2199 return -EINPROGRESS; 2200 } 2201 dev_kfree_skb(resp); 2202 2203 if (status != 0) { 2204 nfc_tm_deactivated(dev->nfc_dev); 2205 2206 dev->tgt_mode = 0; 2207 2208 return 0; 2209 } 2210 2211 queue_work(dev->wq, &dev->tg_work); 2212 2213 return 0; 2214 } 2215 2216 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 2217 { 2218 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2219 int rc; 2220 2221 dev_dbg(dev->dev, "%s\n", __func__); 2222 2223 /* let's split in multiple chunks if size's too big */ 2224 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { 2225 rc = pn533_fill_fragment_skbs(dev, skb); 2226 if (rc <= 0) 2227 goto error; 2228 2229 /* get the first skb */ 2230 skb = skb_dequeue(&dev->fragment_skb); 2231 if (!skb) { 2232 rc = -EIO; 2233 goto error; 2234 } 2235 2236 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb, 2237 pn533_tm_send_complete, NULL); 2238 } else { 2239 /* Send th skb */ 2240 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb, 2241 pn533_tm_send_complete, NULL); 2242 } 2243 2244 error: 2245 if (rc < 0) { 2246 dev_kfree_skb(skb); 2247 skb_queue_purge(&dev->fragment_skb); 2248 } 2249 2250 return rc; 2251 } 2252 2253 static void pn533_wq_mi_recv(struct work_struct *work) 2254 { 2255 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work); 2256 struct sk_buff *skb; 2257 int rc; 2258 2259 dev_dbg(dev->dev, "%s\n", __func__); 2260 2261 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN); 2262 if (!skb) 2263 goto error; 2264 2265 switch (dev->device_type) { 2266 case PN533_DEVICE_PASORI: 2267 if (dev->tgt_active_prot == NFC_PROTO_FELICA) { 2268 rc = pn533_send_cmd_direct_async(dev, 2269 PN533_CMD_IN_COMM_THRU, 2270 skb, 2271 pn533_data_exchange_complete, 2272 dev->cmd_complete_mi_arg); 2273 2274 break; 2275 } 2276 default: 2277 skb_put_u8(skb, 1); /*TG*/ 2278 2279 rc = pn533_send_cmd_direct_async(dev, 2280 PN533_CMD_IN_DATA_EXCHANGE, 2281 skb, 2282 pn533_data_exchange_complete, 2283 dev->cmd_complete_mi_arg); 2284 2285 break; 2286 } 2287 2288 if (rc == 0) /* success */ 2289 return; 2290 2291 nfc_err(dev->dev, 2292 "Error %d when trying to perform data_exchange\n", rc); 2293 2294 dev_kfree_skb(skb); 2295 kfree(dev->cmd_complete_mi_arg); 2296 2297 error: 2298 dev->phy_ops->send_ack(dev, GFP_KERNEL); 2299 queue_work(dev->wq, &dev->cmd_work); 2300 } 2301 2302 static void pn533_wq_mi_send(struct work_struct *work) 2303 { 2304 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work); 2305 struct sk_buff *skb; 2306 int rc; 2307 2308 dev_dbg(dev->dev, "%s\n", __func__); 2309 2310 /* Grab the first skb in the queue */ 2311 skb = skb_dequeue(&dev->fragment_skb); 2312 2313 if (skb == NULL) { /* No more data */ 2314 /* Reset the queue for future use */ 2315 skb_queue_head_init(&dev->fragment_skb); 2316 goto error; 2317 } 2318 2319 switch (dev->device_type) { 2320 case PN533_DEVICE_PASORI: 2321 if (dev->tgt_active_prot != NFC_PROTO_FELICA) { 2322 rc = -EIO; 2323 break; 2324 } 2325 2326 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU, 2327 skb, 2328 pn533_data_exchange_complete, 2329 dev->cmd_complete_dep_arg); 2330 2331 break; 2332 2333 default: 2334 /* Still some fragments? */ 2335 rc = pn533_send_cmd_direct_async(dev, 2336 PN533_CMD_IN_DATA_EXCHANGE, 2337 skb, 2338 pn533_data_exchange_complete, 2339 dev->cmd_complete_dep_arg); 2340 2341 break; 2342 } 2343 2344 if (rc == 0) /* success */ 2345 return; 2346 2347 nfc_err(dev->dev, 2348 "Error %d when trying to perform data_exchange\n", rc); 2349 2350 dev_kfree_skb(skb); 2351 kfree(dev->cmd_complete_dep_arg); 2352 2353 error: 2354 dev->phy_ops->send_ack(dev, GFP_KERNEL); 2355 queue_work(dev->wq, &dev->cmd_work); 2356 } 2357 2358 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata, 2359 u8 cfgdata_len) 2360 { 2361 struct sk_buff *skb; 2362 struct sk_buff *resp; 2363 int skb_len; 2364 2365 dev_dbg(dev->dev, "%s\n", __func__); 2366 2367 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */ 2368 2369 skb = pn533_alloc_skb(dev, skb_len); 2370 if (!skb) 2371 return -ENOMEM; 2372 2373 skb_put_u8(skb, cfgitem); 2374 skb_put_data(skb, cfgdata, cfgdata_len); 2375 2376 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb); 2377 if (IS_ERR(resp)) 2378 return PTR_ERR(resp); 2379 2380 dev_kfree_skb(resp); 2381 return 0; 2382 } 2383 2384 static int pn533_get_firmware_version(struct pn533 *dev, 2385 struct pn533_fw_version *fv) 2386 { 2387 struct sk_buff *skb; 2388 struct sk_buff *resp; 2389 2390 skb = pn533_alloc_skb(dev, 0); 2391 if (!skb) 2392 return -ENOMEM; 2393 2394 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb); 2395 if (IS_ERR(resp)) 2396 return PTR_ERR(resp); 2397 2398 fv->ic = resp->data[0]; 2399 fv->ver = resp->data[1]; 2400 fv->rev = resp->data[2]; 2401 fv->support = resp->data[3]; 2402 2403 dev_kfree_skb(resp); 2404 return 0; 2405 } 2406 2407 static int pn533_pasori_fw_reset(struct pn533 *dev) 2408 { 2409 struct sk_buff *skb; 2410 struct sk_buff *resp; 2411 2412 dev_dbg(dev->dev, "%s\n", __func__); 2413 2414 skb = pn533_alloc_skb(dev, sizeof(u8)); 2415 if (!skb) 2416 return -ENOMEM; 2417 2418 skb_put_u8(skb, 0x1); 2419 2420 resp = pn533_send_cmd_sync(dev, 0x18, skb); 2421 if (IS_ERR(resp)) 2422 return PTR_ERR(resp); 2423 2424 dev_kfree_skb(resp); 2425 2426 return 0; 2427 } 2428 2429 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf) 2430 { 2431 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2432 u8 rf_field = !!rf; 2433 int rc; 2434 2435 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA; 2436 2437 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD, 2438 (u8 *)&rf_field, 1); 2439 if (rc) { 2440 nfc_err(dev->dev, "Error on setting RF field\n"); 2441 return rc; 2442 } 2443 2444 return rc; 2445 } 2446 2447 static int pn532_sam_configuration(struct nfc_dev *nfc_dev) 2448 { 2449 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2450 struct sk_buff *skb; 2451 struct sk_buff *resp; 2452 2453 skb = pn533_alloc_skb(dev, 1); 2454 if (!skb) 2455 return -ENOMEM; 2456 2457 skb_put_u8(skb, 0x01); 2458 2459 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb); 2460 if (IS_ERR(resp)) 2461 return PTR_ERR(resp); 2462 2463 dev_kfree_skb(resp); 2464 return 0; 2465 } 2466 2467 static int pn533_dev_up(struct nfc_dev *nfc_dev) 2468 { 2469 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2470 2471 if (dev->device_type == PN533_DEVICE_PN532) { 2472 int rc = pn532_sam_configuration(nfc_dev); 2473 2474 if (rc) 2475 return rc; 2476 } 2477 2478 return pn533_rf_field(nfc_dev, 1); 2479 } 2480 2481 static int pn533_dev_down(struct nfc_dev *nfc_dev) 2482 { 2483 return pn533_rf_field(nfc_dev, 0); 2484 } 2485 2486 static struct nfc_ops pn533_nfc_ops = { 2487 .dev_up = pn533_dev_up, 2488 .dev_down = pn533_dev_down, 2489 .dep_link_up = pn533_dep_link_up, 2490 .dep_link_down = pn533_dep_link_down, 2491 .start_poll = pn533_start_poll, 2492 .stop_poll = pn533_stop_poll, 2493 .activate_target = pn533_activate_target, 2494 .deactivate_target = pn533_deactivate_target, 2495 .im_transceive = pn533_transceive, 2496 .tm_send = pn533_tm_send, 2497 }; 2498 2499 static int pn533_setup(struct pn533 *dev) 2500 { 2501 struct pn533_config_max_retries max_retries; 2502 struct pn533_config_timing timing; 2503 u8 pasori_cfg[3] = {0x08, 0x01, 0x08}; 2504 int rc; 2505 2506 switch (dev->device_type) { 2507 case PN533_DEVICE_STD: 2508 case PN533_DEVICE_PASORI: 2509 case PN533_DEVICE_ACR122U: 2510 case PN533_DEVICE_PN532: 2511 max_retries.mx_rty_atr = 0x2; 2512 max_retries.mx_rty_psl = 0x1; 2513 max_retries.mx_rty_passive_act = 2514 PN533_CONFIG_MAX_RETRIES_NO_RETRY; 2515 2516 timing.rfu = PN533_CONFIG_TIMING_102; 2517 timing.atr_res_timeout = PN533_CONFIG_TIMING_102; 2518 timing.dep_timeout = PN533_CONFIG_TIMING_204; 2519 2520 break; 2521 2522 default: 2523 nfc_err(dev->dev, "Unknown device type %d\n", 2524 dev->device_type); 2525 return -EINVAL; 2526 } 2527 2528 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES, 2529 (u8 *)&max_retries, sizeof(max_retries)); 2530 if (rc) { 2531 nfc_err(dev->dev, 2532 "Error on setting MAX_RETRIES config\n"); 2533 return rc; 2534 } 2535 2536 2537 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING, 2538 (u8 *)&timing, sizeof(timing)); 2539 if (rc) { 2540 nfc_err(dev->dev, "Error on setting RF timings\n"); 2541 return rc; 2542 } 2543 2544 switch (dev->device_type) { 2545 case PN533_DEVICE_STD: 2546 case PN533_DEVICE_PN532: 2547 break; 2548 2549 case PN533_DEVICE_PASORI: 2550 pn533_pasori_fw_reset(dev); 2551 2552 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI, 2553 pasori_cfg, 3); 2554 if (rc) { 2555 nfc_err(dev->dev, 2556 "Error while settings PASORI config\n"); 2557 return rc; 2558 } 2559 2560 pn533_pasori_fw_reset(dev); 2561 2562 break; 2563 } 2564 2565 return 0; 2566 } 2567 2568 int pn533_finalize_setup(struct pn533 *dev) 2569 { 2570 2571 struct pn533_fw_version fw_ver; 2572 int rc; 2573 2574 memset(&fw_ver, 0, sizeof(fw_ver)); 2575 2576 rc = pn533_get_firmware_version(dev, &fw_ver); 2577 if (rc) { 2578 nfc_err(dev->dev, "Unable to get FW version\n"); 2579 return rc; 2580 } 2581 2582 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n", 2583 fw_ver.ic, fw_ver.ver, fw_ver.rev); 2584 2585 rc = pn533_setup(dev); 2586 if (rc) 2587 return rc; 2588 2589 return 0; 2590 } 2591 EXPORT_SYMBOL_GPL(pn533_finalize_setup); 2592 2593 struct pn533 *pn533_register_device(u32 device_type, 2594 u32 protocols, 2595 enum pn533_protocol_type protocol_type, 2596 void *phy, 2597 struct pn533_phy_ops *phy_ops, 2598 struct pn533_frame_ops *fops, 2599 struct device *dev, 2600 struct device *parent) 2601 { 2602 struct pn533 *priv; 2603 int rc = -ENOMEM; 2604 2605 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2606 if (!priv) 2607 return ERR_PTR(-ENOMEM); 2608 2609 priv->phy = phy; 2610 priv->phy_ops = phy_ops; 2611 priv->dev = dev; 2612 if (fops != NULL) 2613 priv->ops = fops; 2614 else 2615 priv->ops = &pn533_std_frame_ops; 2616 2617 priv->protocol_type = protocol_type; 2618 priv->device_type = device_type; 2619 2620 mutex_init(&priv->cmd_lock); 2621 2622 INIT_WORK(&priv->cmd_work, pn533_wq_cmd); 2623 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete); 2624 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv); 2625 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send); 2626 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data); 2627 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv); 2628 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send); 2629 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll); 2630 INIT_WORK(&priv->rf_work, pn533_wq_rf); 2631 priv->wq = alloc_ordered_workqueue("pn533", 0); 2632 if (priv->wq == NULL) 2633 goto error; 2634 2635 timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0); 2636 2637 skb_queue_head_init(&priv->resp_q); 2638 skb_queue_head_init(&priv->fragment_skb); 2639 2640 INIT_LIST_HEAD(&priv->cmd_queue); 2641 2642 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols, 2643 priv->ops->tx_header_len + 2644 PN533_CMD_DATAEXCH_HEAD_LEN, 2645 priv->ops->tx_tail_len); 2646 if (!priv->nfc_dev) { 2647 rc = -ENOMEM; 2648 goto destroy_wq; 2649 } 2650 2651 nfc_set_parent_dev(priv->nfc_dev, parent); 2652 nfc_set_drvdata(priv->nfc_dev, priv); 2653 2654 rc = nfc_register_device(priv->nfc_dev); 2655 if (rc) 2656 goto free_nfc_dev; 2657 2658 return priv; 2659 2660 free_nfc_dev: 2661 nfc_free_device(priv->nfc_dev); 2662 2663 destroy_wq: 2664 destroy_workqueue(priv->wq); 2665 error: 2666 kfree(priv); 2667 return ERR_PTR(rc); 2668 } 2669 EXPORT_SYMBOL_GPL(pn533_register_device); 2670 2671 void pn533_unregister_device(struct pn533 *priv) 2672 { 2673 struct pn533_cmd *cmd, *n; 2674 2675 nfc_unregister_device(priv->nfc_dev); 2676 nfc_free_device(priv->nfc_dev); 2677 2678 flush_delayed_work(&priv->poll_work); 2679 destroy_workqueue(priv->wq); 2680 2681 skb_queue_purge(&priv->resp_q); 2682 2683 del_timer(&priv->listen_timer); 2684 2685 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) { 2686 list_del(&cmd->queue); 2687 kfree(cmd); 2688 } 2689 2690 kfree(priv); 2691 } 2692 EXPORT_SYMBOL_GPL(pn533_unregister_device); 2693 2694 2695 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); 2696 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>"); 2697 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>"); 2698 MODULE_DESCRIPTION("PN533 driver ver " VERSION); 2699 MODULE_VERSION(VERSION); 2700 MODULE_LICENSE("GPL"); 2701