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, *gb; 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(skb, 1) = PN533_INIT_TARGET_DEP; 1036 1037 /* MIFARE params */ 1038 memcpy(skb_put(skb, 6), mifare_params, 6); 1039 1040 /* Felica params */ 1041 felica = skb_put(skb, 18); 1042 memcpy(felica, felica_params, 18); 1043 get_random_bytes(felica + 2, 6); 1044 1045 /* NFCID3 */ 1046 nfcid3 = skb_put(skb, 10); 1047 memset(nfcid3, 0, 10); 1048 memcpy(nfcid3, felica, 8); 1049 1050 /* General bytes */ 1051 *skb_put(skb, 1) = gbytes_len; 1052 1053 gb = skb_put(skb, gbytes_len); 1054 memcpy(gb, gbytes, gbytes_len); 1055 1056 /* Len Tk */ 1057 *skb_put(skb, 1) = 0; 1058 1059 return skb; 1060 } 1061 1062 static void pn533_wq_tm_mi_recv(struct work_struct *work); 1063 static struct sk_buff *pn533_build_response(struct pn533 *dev); 1064 1065 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg, 1066 struct sk_buff *resp) 1067 { 1068 struct sk_buff *skb; 1069 u8 status, ret, mi; 1070 int rc; 1071 1072 dev_dbg(dev->dev, "%s\n", __func__); 1073 1074 if (IS_ERR(resp)) { 1075 skb_queue_purge(&dev->resp_q); 1076 return PTR_ERR(resp); 1077 } 1078 1079 status = resp->data[0]; 1080 1081 ret = status & PN533_CMD_RET_MASK; 1082 mi = status & PN533_CMD_MI_MASK; 1083 1084 skb_pull(resp, sizeof(status)); 1085 1086 if (ret != PN533_CMD_RET_SUCCESS) { 1087 rc = -EIO; 1088 goto error; 1089 } 1090 1091 skb_queue_tail(&dev->resp_q, resp); 1092 1093 if (mi) { 1094 queue_work(dev->wq, &dev->mi_tm_rx_work); 1095 return -EINPROGRESS; 1096 } 1097 1098 skb = pn533_build_response(dev); 1099 if (!skb) { 1100 rc = -EIO; 1101 goto error; 1102 } 1103 1104 return nfc_tm_data_received(dev->nfc_dev, skb); 1105 1106 error: 1107 nfc_tm_deactivated(dev->nfc_dev); 1108 dev->tgt_mode = 0; 1109 skb_queue_purge(&dev->resp_q); 1110 dev_kfree_skb(resp); 1111 1112 return rc; 1113 } 1114 1115 static void pn533_wq_tm_mi_recv(struct work_struct *work) 1116 { 1117 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work); 1118 struct sk_buff *skb; 1119 int rc; 1120 1121 dev_dbg(dev->dev, "%s\n", __func__); 1122 1123 skb = pn533_alloc_skb(dev, 0); 1124 if (!skb) 1125 return; 1126 1127 rc = pn533_send_cmd_direct_async(dev, 1128 PN533_CMD_TG_GET_DATA, 1129 skb, 1130 pn533_tm_get_data_complete, 1131 NULL); 1132 1133 if (rc < 0) 1134 dev_kfree_skb(skb); 1135 } 1136 1137 static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 1138 struct sk_buff *resp); 1139 static void pn533_wq_tm_mi_send(struct work_struct *work) 1140 { 1141 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work); 1142 struct sk_buff *skb; 1143 int rc; 1144 1145 dev_dbg(dev->dev, "%s\n", __func__); 1146 1147 /* Grab the first skb in the queue */ 1148 skb = skb_dequeue(&dev->fragment_skb); 1149 if (skb == NULL) { /* No more data */ 1150 /* Reset the queue for future use */ 1151 skb_queue_head_init(&dev->fragment_skb); 1152 goto error; 1153 } 1154 1155 /* last entry - remove MI bit */ 1156 if (skb_queue_len(&dev->fragment_skb) == 0) { 1157 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA, 1158 skb, pn533_tm_send_complete, NULL); 1159 } else 1160 rc = pn533_send_cmd_direct_async(dev, 1161 PN533_CMD_TG_SET_META_DATA, 1162 skb, pn533_tm_send_complete, NULL); 1163 1164 if (rc == 0) /* success */ 1165 return; 1166 1167 dev_err(dev->dev, 1168 "Error %d when trying to perform set meta data_exchange", rc); 1169 1170 dev_kfree_skb(skb); 1171 1172 error: 1173 dev->phy_ops->send_ack(dev, GFP_KERNEL); 1174 queue_work(dev->wq, &dev->cmd_work); 1175 } 1176 1177 static void pn533_wq_tg_get_data(struct work_struct *work) 1178 { 1179 struct pn533 *dev = container_of(work, struct pn533, tg_work); 1180 struct sk_buff *skb; 1181 int rc; 1182 1183 dev_dbg(dev->dev, "%s\n", __func__); 1184 1185 skb = pn533_alloc_skb(dev, 0); 1186 if (!skb) 1187 return; 1188 1189 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb, 1190 pn533_tm_get_data_complete, NULL); 1191 1192 if (rc < 0) 1193 dev_kfree_skb(skb); 1194 } 1195 1196 #define ATR_REQ_GB_OFFSET 17 1197 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp) 1198 { 1199 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb; 1200 size_t gb_len; 1201 int rc; 1202 1203 dev_dbg(dev->dev, "%s\n", __func__); 1204 1205 if (resp->len < ATR_REQ_GB_OFFSET + 1) 1206 return -EINVAL; 1207 1208 mode = resp->data[0]; 1209 cmd = &resp->data[1]; 1210 1211 dev_dbg(dev->dev, "Target mode 0x%x len %d\n", 1212 mode, resp->len); 1213 1214 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) == 1215 PN533_INIT_TARGET_RESP_ACTIVE) 1216 comm_mode = NFC_COMM_ACTIVE; 1217 1218 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */ 1219 return -EOPNOTSUPP; 1220 1221 gb = cmd + ATR_REQ_GB_OFFSET; 1222 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1); 1223 1224 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, 1225 comm_mode, gb, gb_len); 1226 if (rc < 0) { 1227 nfc_err(dev->dev, 1228 "Error when signaling target activation\n"); 1229 return rc; 1230 } 1231 1232 dev->tgt_mode = 1; 1233 queue_work(dev->wq, &dev->tg_work); 1234 1235 return 0; 1236 } 1237 1238 static void pn533_listen_mode_timer(unsigned long data) 1239 { 1240 struct pn533 *dev = (struct pn533 *)data; 1241 1242 dev_dbg(dev->dev, "Listen mode timeout\n"); 1243 1244 dev->cancel_listen = 1; 1245 1246 pn533_poll_next_mod(dev); 1247 1248 queue_delayed_work(dev->wq, &dev->poll_work, 1249 msecs_to_jiffies(PN533_POLL_INTERVAL)); 1250 } 1251 1252 static int pn533_rf_complete(struct pn533 *dev, void *arg, 1253 struct sk_buff *resp) 1254 { 1255 int rc = 0; 1256 1257 dev_dbg(dev->dev, "%s\n", __func__); 1258 1259 if (IS_ERR(resp)) { 1260 rc = PTR_ERR(resp); 1261 1262 nfc_err(dev->dev, "RF setting error %d\n", rc); 1263 1264 return rc; 1265 } 1266 1267 queue_delayed_work(dev->wq, &dev->poll_work, 1268 msecs_to_jiffies(PN533_POLL_INTERVAL)); 1269 1270 dev_kfree_skb(resp); 1271 return rc; 1272 } 1273 1274 static void pn533_wq_rf(struct work_struct *work) 1275 { 1276 struct pn533 *dev = container_of(work, struct pn533, rf_work); 1277 struct sk_buff *skb; 1278 int rc; 1279 1280 dev_dbg(dev->dev, "%s\n", __func__); 1281 1282 skb = pn533_alloc_skb(dev, 2); 1283 if (!skb) 1284 return; 1285 1286 *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD; 1287 *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA; 1288 1289 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb, 1290 pn533_rf_complete, NULL); 1291 if (rc < 0) { 1292 dev_kfree_skb(skb); 1293 nfc_err(dev->dev, "RF setting error %d\n", rc); 1294 } 1295 } 1296 1297 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg, 1298 struct sk_buff *resp) 1299 { 1300 struct pn533_cmd_jump_dep_response *rsp; 1301 struct nfc_target nfc_target; 1302 u8 target_gt_len; 1303 int rc; 1304 1305 if (IS_ERR(resp)) 1306 return PTR_ERR(resp); 1307 1308 rsp = (struct pn533_cmd_jump_dep_response *)resp->data; 1309 1310 rc = rsp->status & PN533_CMD_RET_MASK; 1311 if (rc != PN533_CMD_RET_SUCCESS) { 1312 /* Not target found, turn radio off */ 1313 queue_work(dev->wq, &dev->rf_work); 1314 1315 dev_kfree_skb(resp); 1316 return 0; 1317 } 1318 1319 dev_dbg(dev->dev, "Creating new target"); 1320 1321 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; 1322 nfc_target.nfcid1_len = 10; 1323 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len); 1324 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); 1325 if (rc) 1326 goto error; 1327 1328 dev->tgt_available_prots = 0; 1329 dev->tgt_active_prot = NFC_PROTO_NFC_DEP; 1330 1331 /* ATR_RES general bytes are located at offset 17 */ 1332 target_gt_len = resp->len - 17; 1333 rc = nfc_set_remote_general_bytes(dev->nfc_dev, 1334 rsp->gt, target_gt_len); 1335 if (!rc) { 1336 rc = nfc_dep_link_is_up(dev->nfc_dev, 1337 dev->nfc_dev->targets[0].idx, 1338 0, NFC_RF_INITIATOR); 1339 1340 if (!rc) 1341 pn533_poll_reset_mod_list(dev); 1342 } 1343 error: 1344 dev_kfree_skb(resp); 1345 return rc; 1346 } 1347 1348 #define PASSIVE_DATA_LEN 5 1349 static int pn533_poll_dep(struct nfc_dev *nfc_dev) 1350 { 1351 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1352 struct sk_buff *skb; 1353 int rc, skb_len; 1354 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE]; 1355 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3}; 1356 1357 dev_dbg(dev->dev, "%s", __func__); 1358 1359 if (!dev->gb) { 1360 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len); 1361 1362 if (!dev->gb || !dev->gb_len) { 1363 dev->poll_dep = 0; 1364 queue_work(dev->wq, &dev->rf_work); 1365 } 1366 } 1367 1368 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */ 1369 skb_len += PASSIVE_DATA_LEN; 1370 1371 /* NFCID3 */ 1372 skb_len += NFC_NFCID3_MAXSIZE; 1373 nfcid3[0] = 0x1; 1374 nfcid3[1] = 0xfe; 1375 get_random_bytes(nfcid3 + 2, 6); 1376 1377 skb = pn533_alloc_skb(dev, skb_len); 1378 if (!skb) 1379 return -ENOMEM; 1380 1381 *skb_put(skb, 1) = 0x01; /* Active */ 1382 *skb_put(skb, 1) = 0x02; /* 424 kbps */ 1383 1384 next = skb_put(skb, 1); /* Next */ 1385 *next = 0; 1386 1387 /* Copy passive data */ 1388 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN); 1389 *next |= 1; 1390 1391 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */ 1392 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3, 1393 NFC_NFCID3_MAXSIZE); 1394 *next |= 2; 1395 1396 memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len); 1397 *next |= 4; /* We have some Gi */ 1398 1399 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb, 1400 pn533_poll_dep_complete, NULL); 1401 1402 if (rc < 0) 1403 dev_kfree_skb(skb); 1404 1405 return rc; 1406 } 1407 1408 static int pn533_poll_complete(struct pn533 *dev, void *arg, 1409 struct sk_buff *resp) 1410 { 1411 struct pn533_poll_modulations *cur_mod; 1412 int rc; 1413 1414 dev_dbg(dev->dev, "%s\n", __func__); 1415 1416 if (IS_ERR(resp)) { 1417 rc = PTR_ERR(resp); 1418 1419 nfc_err(dev->dev, "%s Poll complete error %d\n", 1420 __func__, rc); 1421 1422 if (rc == -ENOENT) { 1423 if (dev->poll_mod_count != 0) 1424 return rc; 1425 goto stop_poll; 1426 } else if (rc < 0) { 1427 nfc_err(dev->dev, 1428 "Error %d when running poll\n", rc); 1429 goto stop_poll; 1430 } 1431 } 1432 1433 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1434 1435 if (cur_mod->len == 0) { /* Target mode */ 1436 del_timer(&dev->listen_timer); 1437 rc = pn533_init_target_complete(dev, resp); 1438 goto done; 1439 } 1440 1441 /* Initiator mode */ 1442 rc = pn533_start_poll_complete(dev, resp); 1443 if (!rc) 1444 goto done; 1445 1446 if (!dev->poll_mod_count) { 1447 dev_dbg(dev->dev, "Polling has been stopped\n"); 1448 goto done; 1449 } 1450 1451 pn533_poll_next_mod(dev); 1452 /* Not target found, turn radio off */ 1453 queue_work(dev->wq, &dev->rf_work); 1454 1455 done: 1456 dev_kfree_skb(resp); 1457 return rc; 1458 1459 stop_poll: 1460 nfc_err(dev->dev, "Polling operation has been stopped\n"); 1461 1462 pn533_poll_reset_mod_list(dev); 1463 dev->poll_protocols = 0; 1464 return rc; 1465 } 1466 1467 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev, 1468 struct pn533_poll_modulations *mod) 1469 { 1470 struct sk_buff *skb; 1471 1472 skb = pn533_alloc_skb(dev, mod->len); 1473 if (!skb) 1474 return NULL; 1475 1476 memcpy(skb_put(skb, mod->len), &mod->data, mod->len); 1477 1478 return skb; 1479 } 1480 1481 static int pn533_send_poll_frame(struct pn533 *dev) 1482 { 1483 struct pn533_poll_modulations *mod; 1484 struct sk_buff *skb; 1485 int rc; 1486 u8 cmd_code; 1487 1488 mod = dev->poll_mod_active[dev->poll_mod_curr]; 1489 1490 dev_dbg(dev->dev, "%s mod len %d\n", 1491 __func__, mod->len); 1492 1493 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) { 1494 dev->poll_dep = 0; 1495 return pn533_poll_dep(dev->nfc_dev); 1496 } 1497 1498 if (mod->len == 0) { /* Listen mode */ 1499 cmd_code = PN533_CMD_TG_INIT_AS_TARGET; 1500 skb = pn533_alloc_poll_tg_frame(dev); 1501 } else { /* Polling mode */ 1502 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET; 1503 skb = pn533_alloc_poll_in_frame(dev, mod); 1504 } 1505 1506 if (!skb) { 1507 nfc_err(dev->dev, "Failed to allocate skb\n"); 1508 return -ENOMEM; 1509 } 1510 1511 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete, 1512 NULL); 1513 if (rc < 0) { 1514 dev_kfree_skb(skb); 1515 nfc_err(dev->dev, "Polling loop error %d\n", rc); 1516 } 1517 1518 return rc; 1519 } 1520 1521 static void pn533_wq_poll(struct work_struct *work) 1522 { 1523 struct pn533 *dev = container_of(work, struct pn533, poll_work.work); 1524 struct pn533_poll_modulations *cur_mod; 1525 int rc; 1526 1527 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1528 1529 dev_dbg(dev->dev, 1530 "%s cancel_listen %d modulation len %d\n", 1531 __func__, dev->cancel_listen, cur_mod->len); 1532 1533 if (dev->cancel_listen == 1) { 1534 dev->cancel_listen = 0; 1535 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC); 1536 } 1537 1538 rc = pn533_send_poll_frame(dev); 1539 if (rc) 1540 return; 1541 1542 if (cur_mod->len == 0 && dev->poll_mod_count > 1) 1543 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ); 1544 } 1545 1546 static int pn533_start_poll(struct nfc_dev *nfc_dev, 1547 u32 im_protocols, u32 tm_protocols) 1548 { 1549 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1550 struct pn533_poll_modulations *cur_mod; 1551 u8 rand_mod; 1552 int rc; 1553 1554 dev_dbg(dev->dev, 1555 "%s: im protocols 0x%x tm protocols 0x%x\n", 1556 __func__, im_protocols, tm_protocols); 1557 1558 if (dev->tgt_active_prot) { 1559 nfc_err(dev->dev, 1560 "Cannot poll with a target already activated\n"); 1561 return -EBUSY; 1562 } 1563 1564 if (dev->tgt_mode) { 1565 nfc_err(dev->dev, 1566 "Cannot poll while already being activated\n"); 1567 return -EBUSY; 1568 } 1569 1570 if (tm_protocols) { 1571 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len); 1572 if (dev->gb == NULL) 1573 tm_protocols = 0; 1574 } 1575 1576 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols); 1577 dev->poll_protocols = im_protocols; 1578 dev->listen_protocols = tm_protocols; 1579 1580 /* Do not always start polling from the same modulation */ 1581 get_random_bytes(&rand_mod, sizeof(rand_mod)); 1582 rand_mod %= dev->poll_mod_count; 1583 dev->poll_mod_curr = rand_mod; 1584 1585 cur_mod = dev->poll_mod_active[dev->poll_mod_curr]; 1586 1587 rc = pn533_send_poll_frame(dev); 1588 1589 /* Start listen timer */ 1590 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1) 1591 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ); 1592 1593 return rc; 1594 } 1595 1596 static void pn533_stop_poll(struct nfc_dev *nfc_dev) 1597 { 1598 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1599 1600 del_timer(&dev->listen_timer); 1601 1602 if (!dev->poll_mod_count) { 1603 dev_dbg(dev->dev, 1604 "Polling operation was not running\n"); 1605 return; 1606 } 1607 1608 dev->phy_ops->abort_cmd(dev, GFP_KERNEL); 1609 flush_delayed_work(&dev->poll_work); 1610 pn533_poll_reset_mod_list(dev); 1611 } 1612 1613 static int pn533_activate_target_nfcdep(struct pn533 *dev) 1614 { 1615 struct pn533_cmd_activate_response *rsp; 1616 u16 gt_len; 1617 int rc; 1618 struct sk_buff *skb; 1619 struct sk_buff *resp; 1620 1621 dev_dbg(dev->dev, "%s\n", __func__); 1622 1623 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/ 1624 if (!skb) 1625 return -ENOMEM; 1626 1627 *skb_put(skb, sizeof(u8)) = 1; /* TG */ 1628 *skb_put(skb, sizeof(u8)) = 0; /* Next */ 1629 1630 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb); 1631 if (IS_ERR(resp)) 1632 return PTR_ERR(resp); 1633 1634 rsp = (struct pn533_cmd_activate_response *)resp->data; 1635 rc = rsp->status & PN533_CMD_RET_MASK; 1636 if (rc != PN533_CMD_RET_SUCCESS) { 1637 nfc_err(dev->dev, 1638 "Target activation failed (error 0x%x)\n", rc); 1639 dev_kfree_skb(resp); 1640 return -EIO; 1641 } 1642 1643 /* ATR_RES general bytes are located at offset 16 */ 1644 gt_len = resp->len - 16; 1645 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len); 1646 1647 dev_kfree_skb(resp); 1648 return rc; 1649 } 1650 1651 static int pn533_activate_target(struct nfc_dev *nfc_dev, 1652 struct nfc_target *target, u32 protocol) 1653 { 1654 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1655 int rc; 1656 1657 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol); 1658 1659 if (dev->poll_mod_count) { 1660 nfc_err(dev->dev, 1661 "Cannot activate while polling\n"); 1662 return -EBUSY; 1663 } 1664 1665 if (dev->tgt_active_prot) { 1666 nfc_err(dev->dev, 1667 "There is already an active target\n"); 1668 return -EBUSY; 1669 } 1670 1671 if (!dev->tgt_available_prots) { 1672 nfc_err(dev->dev, 1673 "There is no available target to activate\n"); 1674 return -EINVAL; 1675 } 1676 1677 if (!(dev->tgt_available_prots & (1 << protocol))) { 1678 nfc_err(dev->dev, 1679 "Target doesn't support requested proto %u\n", 1680 protocol); 1681 return -EINVAL; 1682 } 1683 1684 if (protocol == NFC_PROTO_NFC_DEP) { 1685 rc = pn533_activate_target_nfcdep(dev); 1686 if (rc) { 1687 nfc_err(dev->dev, 1688 "Activating target with DEP failed %d\n", rc); 1689 return rc; 1690 } 1691 } 1692 1693 dev->tgt_active_prot = protocol; 1694 dev->tgt_available_prots = 0; 1695 1696 return 0; 1697 } 1698 1699 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg, 1700 struct sk_buff *resp) 1701 { 1702 int rc = 0; 1703 1704 dev_dbg(dev->dev, "%s\n", __func__); 1705 1706 if (IS_ERR(resp)) { 1707 rc = PTR_ERR(resp); 1708 1709 nfc_err(dev->dev, "Target release error %d\n", rc); 1710 1711 return rc; 1712 } 1713 1714 rc = resp->data[0] & PN533_CMD_RET_MASK; 1715 if (rc != PN533_CMD_RET_SUCCESS) 1716 nfc_err(dev->dev, 1717 "Error 0x%x when releasing the target\n", rc); 1718 1719 dev_kfree_skb(resp); 1720 return rc; 1721 } 1722 1723 static void pn533_deactivate_target(struct nfc_dev *nfc_dev, 1724 struct nfc_target *target, u8 mode) 1725 { 1726 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1727 struct sk_buff *skb; 1728 int rc; 1729 1730 dev_dbg(dev->dev, "%s\n", __func__); 1731 1732 if (!dev->tgt_active_prot) { 1733 nfc_err(dev->dev, "There is no active target\n"); 1734 return; 1735 } 1736 1737 dev->tgt_active_prot = 0; 1738 skb_queue_purge(&dev->resp_q); 1739 1740 skb = pn533_alloc_skb(dev, sizeof(u8)); 1741 if (!skb) 1742 return; 1743 1744 *skb_put(skb, 1) = 1; /* TG*/ 1745 1746 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb, 1747 pn533_deactivate_target_complete, NULL); 1748 if (rc < 0) { 1749 dev_kfree_skb(skb); 1750 nfc_err(dev->dev, "Target release error %d\n", rc); 1751 } 1752 } 1753 1754 1755 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg, 1756 struct sk_buff *resp) 1757 { 1758 struct pn533_cmd_jump_dep_response *rsp; 1759 u8 target_gt_len; 1760 int rc; 1761 u8 active = *(u8 *)arg; 1762 1763 kfree(arg); 1764 1765 if (IS_ERR(resp)) 1766 return PTR_ERR(resp); 1767 1768 if (dev->tgt_available_prots && 1769 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) { 1770 nfc_err(dev->dev, 1771 "The target does not support DEP\n"); 1772 rc = -EINVAL; 1773 goto error; 1774 } 1775 1776 rsp = (struct pn533_cmd_jump_dep_response *)resp->data; 1777 1778 rc = rsp->status & PN533_CMD_RET_MASK; 1779 if (rc != PN533_CMD_RET_SUCCESS) { 1780 nfc_err(dev->dev, 1781 "Bringing DEP link up failed (error 0x%x)\n", rc); 1782 goto error; 1783 } 1784 1785 if (!dev->tgt_available_prots) { 1786 struct nfc_target nfc_target; 1787 1788 dev_dbg(dev->dev, "Creating new target\n"); 1789 1790 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK; 1791 nfc_target.nfcid1_len = 10; 1792 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len); 1793 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1); 1794 if (rc) 1795 goto error; 1796 1797 dev->tgt_available_prots = 0; 1798 } 1799 1800 dev->tgt_active_prot = NFC_PROTO_NFC_DEP; 1801 1802 /* ATR_RES general bytes are located at offset 17 */ 1803 target_gt_len = resp->len - 17; 1804 rc = nfc_set_remote_general_bytes(dev->nfc_dev, 1805 rsp->gt, target_gt_len); 1806 if (rc == 0) 1807 rc = nfc_dep_link_is_up(dev->nfc_dev, 1808 dev->nfc_dev->targets[0].idx, 1809 !active, NFC_RF_INITIATOR); 1810 1811 error: 1812 dev_kfree_skb(resp); 1813 return rc; 1814 } 1815 1816 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf); 1817 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target, 1818 u8 comm_mode, u8 *gb, size_t gb_len) 1819 { 1820 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1821 struct sk_buff *skb; 1822 int rc, skb_len; 1823 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE]; 1824 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3}; 1825 1826 dev_dbg(dev->dev, "%s\n", __func__); 1827 1828 if (dev->poll_mod_count) { 1829 nfc_err(dev->dev, 1830 "Cannot bring the DEP link up while polling\n"); 1831 return -EBUSY; 1832 } 1833 1834 if (dev->tgt_active_prot) { 1835 nfc_err(dev->dev, 1836 "There is already an active target\n"); 1837 return -EBUSY; 1838 } 1839 1840 skb_len = 3 + gb_len; /* ActPass + BR + Next */ 1841 skb_len += PASSIVE_DATA_LEN; 1842 1843 /* NFCID3 */ 1844 skb_len += NFC_NFCID3_MAXSIZE; 1845 if (target && !target->nfcid2_len) { 1846 nfcid3[0] = 0x1; 1847 nfcid3[1] = 0xfe; 1848 get_random_bytes(nfcid3 + 2, 6); 1849 } 1850 1851 skb = pn533_alloc_skb(dev, skb_len); 1852 if (!skb) 1853 return -ENOMEM; 1854 1855 *skb_put(skb, 1) = !comm_mode; /* ActPass */ 1856 *skb_put(skb, 1) = 0x02; /* 424 kbps */ 1857 1858 next = skb_put(skb, 1); /* Next */ 1859 *next = 0; 1860 1861 /* Copy passive data */ 1862 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN); 1863 *next |= 1; 1864 1865 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */ 1866 if (target && target->nfcid2_len) 1867 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2, 1868 target->nfcid2_len); 1869 else 1870 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3, 1871 NFC_NFCID3_MAXSIZE); 1872 *next |= 2; 1873 1874 if (gb != NULL && gb_len > 0) { 1875 memcpy(skb_put(skb, gb_len), gb, gb_len); 1876 *next |= 4; /* We have some Gi */ 1877 } else { 1878 *next = 0; 1879 } 1880 1881 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 1882 if (!arg) { 1883 dev_kfree_skb(skb); 1884 return -ENOMEM; 1885 } 1886 1887 *arg = !comm_mode; 1888 1889 pn533_rf_field(dev->nfc_dev, 0); 1890 1891 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb, 1892 pn533_in_dep_link_up_complete, arg); 1893 1894 if (rc < 0) { 1895 dev_kfree_skb(skb); 1896 kfree(arg); 1897 } 1898 1899 return rc; 1900 } 1901 1902 static int pn533_dep_link_down(struct nfc_dev *nfc_dev) 1903 { 1904 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 1905 1906 dev_dbg(dev->dev, "%s\n", __func__); 1907 1908 pn533_poll_reset_mod_list(dev); 1909 1910 if (dev->tgt_mode || dev->tgt_active_prot) 1911 dev->phy_ops->abort_cmd(dev, GFP_KERNEL); 1912 1913 dev->tgt_active_prot = 0; 1914 dev->tgt_mode = 0; 1915 1916 skb_queue_purge(&dev->resp_q); 1917 1918 return 0; 1919 } 1920 1921 struct pn533_data_exchange_arg { 1922 data_exchange_cb_t cb; 1923 void *cb_context; 1924 }; 1925 1926 static struct sk_buff *pn533_build_response(struct pn533 *dev) 1927 { 1928 struct sk_buff *skb, *tmp, *t; 1929 unsigned int skb_len = 0, tmp_len = 0; 1930 1931 dev_dbg(dev->dev, "%s\n", __func__); 1932 1933 if (skb_queue_empty(&dev->resp_q)) 1934 return NULL; 1935 1936 if (skb_queue_len(&dev->resp_q) == 1) { 1937 skb = skb_dequeue(&dev->resp_q); 1938 goto out; 1939 } 1940 1941 skb_queue_walk_safe(&dev->resp_q, tmp, t) 1942 skb_len += tmp->len; 1943 1944 dev_dbg(dev->dev, "%s total length %d\n", 1945 __func__, skb_len); 1946 1947 skb = alloc_skb(skb_len, GFP_KERNEL); 1948 if (skb == NULL) 1949 goto out; 1950 1951 skb_put(skb, skb_len); 1952 1953 skb_queue_walk_safe(&dev->resp_q, tmp, t) { 1954 memcpy(skb->data + tmp_len, tmp->data, tmp->len); 1955 tmp_len += tmp->len; 1956 } 1957 1958 out: 1959 skb_queue_purge(&dev->resp_q); 1960 1961 return skb; 1962 } 1963 1964 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg, 1965 struct sk_buff *resp) 1966 { 1967 struct pn533_data_exchange_arg *arg = _arg; 1968 struct sk_buff *skb; 1969 int rc = 0; 1970 u8 status, ret, mi; 1971 1972 dev_dbg(dev->dev, "%s\n", __func__); 1973 1974 if (IS_ERR(resp)) { 1975 rc = PTR_ERR(resp); 1976 goto _error; 1977 } 1978 1979 status = resp->data[0]; 1980 ret = status & PN533_CMD_RET_MASK; 1981 mi = status & PN533_CMD_MI_MASK; 1982 1983 skb_pull(resp, sizeof(status)); 1984 1985 if (ret != PN533_CMD_RET_SUCCESS) { 1986 nfc_err(dev->dev, 1987 "Exchanging data failed (error 0x%x)\n", ret); 1988 rc = -EIO; 1989 goto error; 1990 } 1991 1992 skb_queue_tail(&dev->resp_q, resp); 1993 1994 if (mi) { 1995 dev->cmd_complete_mi_arg = arg; 1996 queue_work(dev->wq, &dev->mi_rx_work); 1997 return -EINPROGRESS; 1998 } 1999 2000 /* Prepare for the next round */ 2001 if (skb_queue_len(&dev->fragment_skb) > 0) { 2002 dev->cmd_complete_dep_arg = arg; 2003 queue_work(dev->wq, &dev->mi_tx_work); 2004 2005 return -EINPROGRESS; 2006 } 2007 2008 skb = pn533_build_response(dev); 2009 if (!skb) { 2010 rc = -ENOMEM; 2011 goto error; 2012 } 2013 2014 arg->cb(arg->cb_context, skb, 0); 2015 kfree(arg); 2016 return 0; 2017 2018 error: 2019 dev_kfree_skb(resp); 2020 _error: 2021 skb_queue_purge(&dev->resp_q); 2022 arg->cb(arg->cb_context, NULL, rc); 2023 kfree(arg); 2024 return rc; 2025 } 2026 2027 /* 2028 * Receive an incoming pn533 frame. skb contains only header and payload. 2029 * If skb == NULL, it is a notification that the link below is dead. 2030 */ 2031 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status) 2032 { 2033 if (!dev->cmd) 2034 goto sched_wq; 2035 2036 dev->cmd->status = status; 2037 2038 if (status != 0) { 2039 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status); 2040 goto sched_wq; 2041 } 2042 2043 if (skb == NULL) { 2044 pr_err("NULL Frame -> link is dead\n"); 2045 goto sched_wq; 2046 } 2047 2048 if (pn533_rx_frame_is_ack(skb->data)) { 2049 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__); 2050 dev_kfree_skb(skb); 2051 return; 2052 } 2053 2054 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data, 2055 dev->ops->rx_frame_size(skb->data), false); 2056 2057 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) { 2058 nfc_err(dev->dev, "Received an invalid frame\n"); 2059 dev->cmd->status = -EIO; 2060 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) { 2061 nfc_err(dev->dev, "It it not the response to the last command\n"); 2062 dev->cmd->status = -EIO; 2063 } 2064 2065 dev->cmd->resp = skb; 2066 2067 sched_wq: 2068 queue_work(dev->wq, &dev->cmd_complete_work); 2069 } 2070 EXPORT_SYMBOL(pn533_recv_frame); 2071 2072 /* Split the Tx skb into small chunks */ 2073 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb) 2074 { 2075 struct sk_buff *frag; 2076 int frag_size; 2077 2078 do { 2079 /* Remaining size */ 2080 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN) 2081 frag_size = PN533_CMD_DATAFRAME_MAXLEN; 2082 else 2083 frag_size = skb->len; 2084 2085 /* Allocate and reserve */ 2086 frag = pn533_alloc_skb(dev, frag_size); 2087 if (!frag) { 2088 skb_queue_purge(&dev->fragment_skb); 2089 break; 2090 } 2091 2092 if (!dev->tgt_mode) { 2093 /* Reserve the TG/MI byte */ 2094 skb_reserve(frag, 1); 2095 2096 /* MI + TG */ 2097 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN) 2098 *skb_push(frag, sizeof(u8)) = 2099 (PN533_CMD_MI_MASK | 1); 2100 else 2101 *skb_push(frag, sizeof(u8)) = 1; /* TG */ 2102 } 2103 2104 memcpy(skb_put(frag, frag_size), skb->data, frag_size); 2105 2106 /* Reduce the size of incoming buffer */ 2107 skb_pull(skb, frag_size); 2108 2109 /* Add this to skb_queue */ 2110 skb_queue_tail(&dev->fragment_skb, frag); 2111 2112 } while (skb->len > 0); 2113 2114 dev_kfree_skb(skb); 2115 2116 return skb_queue_len(&dev->fragment_skb); 2117 } 2118 2119 static int pn533_transceive(struct nfc_dev *nfc_dev, 2120 struct nfc_target *target, struct sk_buff *skb, 2121 data_exchange_cb_t cb, void *cb_context) 2122 { 2123 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2124 struct pn533_data_exchange_arg *arg = NULL; 2125 int rc; 2126 2127 dev_dbg(dev->dev, "%s\n", __func__); 2128 2129 if (!dev->tgt_active_prot) { 2130 nfc_err(dev->dev, 2131 "Can't exchange data if there is no active target\n"); 2132 rc = -EINVAL; 2133 goto error; 2134 } 2135 2136 arg = kmalloc(sizeof(*arg), GFP_KERNEL); 2137 if (!arg) { 2138 rc = -ENOMEM; 2139 goto error; 2140 } 2141 2142 arg->cb = cb; 2143 arg->cb_context = cb_context; 2144 2145 switch (dev->device_type) { 2146 case PN533_DEVICE_PASORI: 2147 if (dev->tgt_active_prot == NFC_PROTO_FELICA) { 2148 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU, 2149 skb, 2150 pn533_data_exchange_complete, 2151 arg); 2152 2153 break; 2154 } 2155 default: 2156 /* jumbo frame ? */ 2157 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { 2158 rc = pn533_fill_fragment_skbs(dev, skb); 2159 if (rc <= 0) 2160 goto error; 2161 2162 skb = skb_dequeue(&dev->fragment_skb); 2163 if (!skb) { 2164 rc = -EIO; 2165 goto error; 2166 } 2167 } else { 2168 *skb_push(skb, sizeof(u8)) = 1; /* TG */ 2169 } 2170 2171 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE, 2172 skb, pn533_data_exchange_complete, 2173 arg); 2174 2175 break; 2176 } 2177 2178 if (rc < 0) /* rc from send_async */ 2179 goto error; 2180 2181 return 0; 2182 2183 error: 2184 kfree(arg); 2185 dev_kfree_skb(skb); 2186 return rc; 2187 } 2188 2189 static int pn533_tm_send_complete(struct pn533 *dev, void *arg, 2190 struct sk_buff *resp) 2191 { 2192 u8 status; 2193 2194 dev_dbg(dev->dev, "%s\n", __func__); 2195 2196 if (IS_ERR(resp)) 2197 return PTR_ERR(resp); 2198 2199 status = resp->data[0]; 2200 2201 /* Prepare for the next round */ 2202 if (skb_queue_len(&dev->fragment_skb) > 0) { 2203 queue_work(dev->wq, &dev->mi_tm_tx_work); 2204 return -EINPROGRESS; 2205 } 2206 dev_kfree_skb(resp); 2207 2208 if (status != 0) { 2209 nfc_tm_deactivated(dev->nfc_dev); 2210 2211 dev->tgt_mode = 0; 2212 2213 return 0; 2214 } 2215 2216 queue_work(dev->wq, &dev->tg_work); 2217 2218 return 0; 2219 } 2220 2221 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb) 2222 { 2223 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2224 int rc; 2225 2226 dev_dbg(dev->dev, "%s\n", __func__); 2227 2228 /* let's split in multiple chunks if size's too big */ 2229 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) { 2230 rc = pn533_fill_fragment_skbs(dev, skb); 2231 if (rc <= 0) 2232 goto error; 2233 2234 /* get the first skb */ 2235 skb = skb_dequeue(&dev->fragment_skb); 2236 if (!skb) { 2237 rc = -EIO; 2238 goto error; 2239 } 2240 2241 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb, 2242 pn533_tm_send_complete, NULL); 2243 } else { 2244 /* Send th skb */ 2245 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb, 2246 pn533_tm_send_complete, NULL); 2247 } 2248 2249 error: 2250 if (rc < 0) { 2251 dev_kfree_skb(skb); 2252 skb_queue_purge(&dev->fragment_skb); 2253 } 2254 2255 return rc; 2256 } 2257 2258 static void pn533_wq_mi_recv(struct work_struct *work) 2259 { 2260 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work); 2261 struct sk_buff *skb; 2262 int rc; 2263 2264 dev_dbg(dev->dev, "%s\n", __func__); 2265 2266 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN); 2267 if (!skb) 2268 goto error; 2269 2270 switch (dev->device_type) { 2271 case PN533_DEVICE_PASORI: 2272 if (dev->tgt_active_prot == NFC_PROTO_FELICA) { 2273 rc = pn533_send_cmd_direct_async(dev, 2274 PN533_CMD_IN_COMM_THRU, 2275 skb, 2276 pn533_data_exchange_complete, 2277 dev->cmd_complete_mi_arg); 2278 2279 break; 2280 } 2281 default: 2282 *skb_put(skb, sizeof(u8)) = 1; /*TG*/ 2283 2284 rc = pn533_send_cmd_direct_async(dev, 2285 PN533_CMD_IN_DATA_EXCHANGE, 2286 skb, 2287 pn533_data_exchange_complete, 2288 dev->cmd_complete_mi_arg); 2289 2290 break; 2291 } 2292 2293 if (rc == 0) /* success */ 2294 return; 2295 2296 nfc_err(dev->dev, 2297 "Error %d when trying to perform data_exchange\n", rc); 2298 2299 dev_kfree_skb(skb); 2300 kfree(dev->cmd_complete_mi_arg); 2301 2302 error: 2303 dev->phy_ops->send_ack(dev, GFP_KERNEL); 2304 queue_work(dev->wq, &dev->cmd_work); 2305 } 2306 2307 static void pn533_wq_mi_send(struct work_struct *work) 2308 { 2309 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work); 2310 struct sk_buff *skb; 2311 int rc; 2312 2313 dev_dbg(dev->dev, "%s\n", __func__); 2314 2315 /* Grab the first skb in the queue */ 2316 skb = skb_dequeue(&dev->fragment_skb); 2317 2318 if (skb == NULL) { /* No more data */ 2319 /* Reset the queue for future use */ 2320 skb_queue_head_init(&dev->fragment_skb); 2321 goto error; 2322 } 2323 2324 switch (dev->device_type) { 2325 case PN533_DEVICE_PASORI: 2326 if (dev->tgt_active_prot != NFC_PROTO_FELICA) { 2327 rc = -EIO; 2328 break; 2329 } 2330 2331 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU, 2332 skb, 2333 pn533_data_exchange_complete, 2334 dev->cmd_complete_dep_arg); 2335 2336 break; 2337 2338 default: 2339 /* Still some fragments? */ 2340 rc = pn533_send_cmd_direct_async(dev, 2341 PN533_CMD_IN_DATA_EXCHANGE, 2342 skb, 2343 pn533_data_exchange_complete, 2344 dev->cmd_complete_dep_arg); 2345 2346 break; 2347 } 2348 2349 if (rc == 0) /* success */ 2350 return; 2351 2352 nfc_err(dev->dev, 2353 "Error %d when trying to perform data_exchange\n", rc); 2354 2355 dev_kfree_skb(skb); 2356 kfree(dev->cmd_complete_dep_arg); 2357 2358 error: 2359 dev->phy_ops->send_ack(dev, GFP_KERNEL); 2360 queue_work(dev->wq, &dev->cmd_work); 2361 } 2362 2363 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata, 2364 u8 cfgdata_len) 2365 { 2366 struct sk_buff *skb; 2367 struct sk_buff *resp; 2368 int skb_len; 2369 2370 dev_dbg(dev->dev, "%s\n", __func__); 2371 2372 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */ 2373 2374 skb = pn533_alloc_skb(dev, skb_len); 2375 if (!skb) 2376 return -ENOMEM; 2377 2378 *skb_put(skb, sizeof(cfgitem)) = cfgitem; 2379 memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len); 2380 2381 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb); 2382 if (IS_ERR(resp)) 2383 return PTR_ERR(resp); 2384 2385 dev_kfree_skb(resp); 2386 return 0; 2387 } 2388 2389 static int pn533_get_firmware_version(struct pn533 *dev, 2390 struct pn533_fw_version *fv) 2391 { 2392 struct sk_buff *skb; 2393 struct sk_buff *resp; 2394 2395 skb = pn533_alloc_skb(dev, 0); 2396 if (!skb) 2397 return -ENOMEM; 2398 2399 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb); 2400 if (IS_ERR(resp)) 2401 return PTR_ERR(resp); 2402 2403 fv->ic = resp->data[0]; 2404 fv->ver = resp->data[1]; 2405 fv->rev = resp->data[2]; 2406 fv->support = resp->data[3]; 2407 2408 dev_kfree_skb(resp); 2409 return 0; 2410 } 2411 2412 static int pn533_pasori_fw_reset(struct pn533 *dev) 2413 { 2414 struct sk_buff *skb; 2415 struct sk_buff *resp; 2416 2417 dev_dbg(dev->dev, "%s\n", __func__); 2418 2419 skb = pn533_alloc_skb(dev, sizeof(u8)); 2420 if (!skb) 2421 return -ENOMEM; 2422 2423 *skb_put(skb, sizeof(u8)) = 0x1; 2424 2425 resp = pn533_send_cmd_sync(dev, 0x18, skb); 2426 if (IS_ERR(resp)) 2427 return PTR_ERR(resp); 2428 2429 dev_kfree_skb(resp); 2430 2431 return 0; 2432 } 2433 2434 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf) 2435 { 2436 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2437 u8 rf_field = !!rf; 2438 int rc; 2439 2440 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA; 2441 2442 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD, 2443 (u8 *)&rf_field, 1); 2444 if (rc) { 2445 nfc_err(dev->dev, "Error on setting RF field\n"); 2446 return rc; 2447 } 2448 2449 return rc; 2450 } 2451 2452 static int pn532_sam_configuration(struct nfc_dev *nfc_dev) 2453 { 2454 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2455 struct sk_buff *skb; 2456 struct sk_buff *resp; 2457 2458 skb = pn533_alloc_skb(dev, 1); 2459 if (!skb) 2460 return -ENOMEM; 2461 2462 *skb_put(skb, 1) = 0x01; 2463 2464 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb); 2465 if (IS_ERR(resp)) 2466 return PTR_ERR(resp); 2467 2468 dev_kfree_skb(resp); 2469 return 0; 2470 } 2471 2472 static int pn533_dev_up(struct nfc_dev *nfc_dev) 2473 { 2474 struct pn533 *dev = nfc_get_drvdata(nfc_dev); 2475 2476 if (dev->device_type == PN533_DEVICE_PN532) { 2477 int rc = pn532_sam_configuration(nfc_dev); 2478 2479 if (rc) 2480 return rc; 2481 } 2482 2483 return pn533_rf_field(nfc_dev, 1); 2484 } 2485 2486 static int pn533_dev_down(struct nfc_dev *nfc_dev) 2487 { 2488 return pn533_rf_field(nfc_dev, 0); 2489 } 2490 2491 static struct nfc_ops pn533_nfc_ops = { 2492 .dev_up = pn533_dev_up, 2493 .dev_down = pn533_dev_down, 2494 .dep_link_up = pn533_dep_link_up, 2495 .dep_link_down = pn533_dep_link_down, 2496 .start_poll = pn533_start_poll, 2497 .stop_poll = pn533_stop_poll, 2498 .activate_target = pn533_activate_target, 2499 .deactivate_target = pn533_deactivate_target, 2500 .im_transceive = pn533_transceive, 2501 .tm_send = pn533_tm_send, 2502 }; 2503 2504 static int pn533_setup(struct pn533 *dev) 2505 { 2506 struct pn533_config_max_retries max_retries; 2507 struct pn533_config_timing timing; 2508 u8 pasori_cfg[3] = {0x08, 0x01, 0x08}; 2509 int rc; 2510 2511 switch (dev->device_type) { 2512 case PN533_DEVICE_STD: 2513 case PN533_DEVICE_PASORI: 2514 case PN533_DEVICE_ACR122U: 2515 case PN533_DEVICE_PN532: 2516 max_retries.mx_rty_atr = 0x2; 2517 max_retries.mx_rty_psl = 0x1; 2518 max_retries.mx_rty_passive_act = 2519 PN533_CONFIG_MAX_RETRIES_NO_RETRY; 2520 2521 timing.rfu = PN533_CONFIG_TIMING_102; 2522 timing.atr_res_timeout = PN533_CONFIG_TIMING_102; 2523 timing.dep_timeout = PN533_CONFIG_TIMING_204; 2524 2525 break; 2526 2527 default: 2528 nfc_err(dev->dev, "Unknown device type %d\n", 2529 dev->device_type); 2530 return -EINVAL; 2531 } 2532 2533 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES, 2534 (u8 *)&max_retries, sizeof(max_retries)); 2535 if (rc) { 2536 nfc_err(dev->dev, 2537 "Error on setting MAX_RETRIES config\n"); 2538 return rc; 2539 } 2540 2541 2542 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING, 2543 (u8 *)&timing, sizeof(timing)); 2544 if (rc) { 2545 nfc_err(dev->dev, "Error on setting RF timings\n"); 2546 return rc; 2547 } 2548 2549 switch (dev->device_type) { 2550 case PN533_DEVICE_STD: 2551 case PN533_DEVICE_PN532: 2552 break; 2553 2554 case PN533_DEVICE_PASORI: 2555 pn533_pasori_fw_reset(dev); 2556 2557 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI, 2558 pasori_cfg, 3); 2559 if (rc) { 2560 nfc_err(dev->dev, 2561 "Error while settings PASORI config\n"); 2562 return rc; 2563 } 2564 2565 pn533_pasori_fw_reset(dev); 2566 2567 break; 2568 } 2569 2570 return 0; 2571 } 2572 2573 int pn533_finalize_setup(struct pn533 *dev) 2574 { 2575 2576 struct pn533_fw_version fw_ver; 2577 int rc; 2578 2579 memset(&fw_ver, 0, sizeof(fw_ver)); 2580 2581 rc = pn533_get_firmware_version(dev, &fw_ver); 2582 if (rc) { 2583 nfc_err(dev->dev, "Unable to get FW version\n"); 2584 return rc; 2585 } 2586 2587 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n", 2588 fw_ver.ic, fw_ver.ver, fw_ver.rev); 2589 2590 rc = pn533_setup(dev); 2591 if (rc) 2592 return rc; 2593 2594 return 0; 2595 } 2596 EXPORT_SYMBOL_GPL(pn533_finalize_setup); 2597 2598 struct pn533 *pn533_register_device(u32 device_type, 2599 u32 protocols, 2600 enum pn533_protocol_type protocol_type, 2601 void *phy, 2602 struct pn533_phy_ops *phy_ops, 2603 struct pn533_frame_ops *fops, 2604 struct device *dev, 2605 struct device *parent) 2606 { 2607 struct pn533 *priv; 2608 int rc = -ENOMEM; 2609 2610 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2611 if (!priv) 2612 return ERR_PTR(-ENOMEM); 2613 2614 priv->phy = phy; 2615 priv->phy_ops = phy_ops; 2616 priv->dev = dev; 2617 if (fops != NULL) 2618 priv->ops = fops; 2619 else 2620 priv->ops = &pn533_std_frame_ops; 2621 2622 priv->protocol_type = protocol_type; 2623 priv->device_type = device_type; 2624 2625 mutex_init(&priv->cmd_lock); 2626 2627 INIT_WORK(&priv->cmd_work, pn533_wq_cmd); 2628 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete); 2629 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv); 2630 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send); 2631 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data); 2632 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv); 2633 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send); 2634 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll); 2635 INIT_WORK(&priv->rf_work, pn533_wq_rf); 2636 priv->wq = alloc_ordered_workqueue("pn533", 0); 2637 if (priv->wq == NULL) 2638 goto error; 2639 2640 init_timer(&priv->listen_timer); 2641 priv->listen_timer.data = (unsigned long) priv; 2642 priv->listen_timer.function = pn533_listen_mode_timer; 2643 2644 skb_queue_head_init(&priv->resp_q); 2645 skb_queue_head_init(&priv->fragment_skb); 2646 2647 INIT_LIST_HEAD(&priv->cmd_queue); 2648 2649 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols, 2650 priv->ops->tx_header_len + 2651 PN533_CMD_DATAEXCH_HEAD_LEN, 2652 priv->ops->tx_tail_len); 2653 if (!priv->nfc_dev) { 2654 rc = -ENOMEM; 2655 goto destroy_wq; 2656 } 2657 2658 nfc_set_parent_dev(priv->nfc_dev, parent); 2659 nfc_set_drvdata(priv->nfc_dev, priv); 2660 2661 rc = nfc_register_device(priv->nfc_dev); 2662 if (rc) 2663 goto free_nfc_dev; 2664 2665 return priv; 2666 2667 free_nfc_dev: 2668 nfc_free_device(priv->nfc_dev); 2669 2670 destroy_wq: 2671 destroy_workqueue(priv->wq); 2672 error: 2673 kfree(priv); 2674 return ERR_PTR(rc); 2675 } 2676 EXPORT_SYMBOL_GPL(pn533_register_device); 2677 2678 void pn533_unregister_device(struct pn533 *priv) 2679 { 2680 struct pn533_cmd *cmd, *n; 2681 2682 nfc_unregister_device(priv->nfc_dev); 2683 nfc_free_device(priv->nfc_dev); 2684 2685 flush_delayed_work(&priv->poll_work); 2686 destroy_workqueue(priv->wq); 2687 2688 skb_queue_purge(&priv->resp_q); 2689 2690 del_timer(&priv->listen_timer); 2691 2692 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) { 2693 list_del(&cmd->queue); 2694 kfree(cmd); 2695 } 2696 2697 kfree(priv); 2698 } 2699 EXPORT_SYMBOL_GPL(pn533_unregister_device); 2700 2701 2702 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); 2703 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>"); 2704 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>"); 2705 MODULE_DESCRIPTION("PN533 driver ver " VERSION); 2706 MODULE_VERSION(VERSION); 2707 MODULE_LICENSE("GPL"); 2708