| 1 | /* |
| 2 | * Copyright (C) 2011 Instituto Nokia de Tecnologia |
| 3 | * |
| 4 | * Authors: |
| 5 | * Lauro Ramos Venancio <lauro.venancio@openbossa.org> |
| 6 | * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the |
| 20 | * Free Software Foundation, Inc., |
| 21 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 22 | */ |
| 23 | |
| 24 | #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ |
| 25 | |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/rfkill.h> |
| 31 | #include <linux/nfc.h> |
| 32 | |
| 33 | #include <net/genetlink.h> |
| 34 | |
| 35 | #include "nfc.h" |
| 36 | |
| 37 | #define VERSION "0.1" |
| 38 | |
| 39 | #define NFC_CHECK_PRES_FREQ_MS 2000 |
| 40 | |
| 41 | int nfc_devlist_generation; |
| 42 | DEFINE_MUTEX(nfc_devlist_mutex); |
| 43 | |
| 44 | /* NFC device ID bitmap */ |
| 45 | static DEFINE_IDA(nfc_index_ida); |
| 46 | |
| 47 | int nfc_fw_upload(struct nfc_dev *dev, const char *firmware_name) |
| 48 | { |
| 49 | int rc = 0; |
| 50 | |
| 51 | pr_debug("%s do firmware %s\n", dev_name(&dev->dev), firmware_name); |
| 52 | |
| 53 | device_lock(&dev->dev); |
| 54 | |
| 55 | if (!device_is_registered(&dev->dev)) { |
| 56 | rc = -ENODEV; |
| 57 | goto error; |
| 58 | } |
| 59 | |
| 60 | if (dev->dev_up) { |
| 61 | rc = -EBUSY; |
| 62 | goto error; |
| 63 | } |
| 64 | |
| 65 | if (!dev->ops->fw_upload) { |
| 66 | rc = -EOPNOTSUPP; |
| 67 | goto error; |
| 68 | } |
| 69 | |
| 70 | dev->fw_upload_in_progress = true; |
| 71 | rc = dev->ops->fw_upload(dev, firmware_name); |
| 72 | if (rc) |
| 73 | dev->fw_upload_in_progress = false; |
| 74 | |
| 75 | error: |
| 76 | device_unlock(&dev->dev); |
| 77 | return rc; |
| 78 | } |
| 79 | |
| 80 | int nfc_fw_upload_done(struct nfc_dev *dev, const char *firmware_name) |
| 81 | { |
| 82 | dev->fw_upload_in_progress = false; |
| 83 | |
| 84 | return nfc_genl_fw_upload_done(dev, firmware_name); |
| 85 | } |
| 86 | EXPORT_SYMBOL(nfc_fw_upload_done); |
| 87 | |
| 88 | /** |
| 89 | * nfc_dev_up - turn on the NFC device |
| 90 | * |
| 91 | * @dev: The nfc device to be turned on |
| 92 | * |
| 93 | * The device remains up until the nfc_dev_down function is called. |
| 94 | */ |
| 95 | int nfc_dev_up(struct nfc_dev *dev) |
| 96 | { |
| 97 | int rc = 0; |
| 98 | |
| 99 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 100 | |
| 101 | device_lock(&dev->dev); |
| 102 | |
| 103 | if (dev->rfkill && rfkill_blocked(dev->rfkill)) { |
| 104 | rc = -ERFKILL; |
| 105 | goto error; |
| 106 | } |
| 107 | |
| 108 | if (!device_is_registered(&dev->dev)) { |
| 109 | rc = -ENODEV; |
| 110 | goto error; |
| 111 | } |
| 112 | |
| 113 | if (dev->fw_upload_in_progress) { |
| 114 | rc = -EBUSY; |
| 115 | goto error; |
| 116 | } |
| 117 | |
| 118 | if (dev->dev_up) { |
| 119 | rc = -EALREADY; |
| 120 | goto error; |
| 121 | } |
| 122 | |
| 123 | if (dev->ops->dev_up) |
| 124 | rc = dev->ops->dev_up(dev); |
| 125 | |
| 126 | if (!rc) |
| 127 | dev->dev_up = true; |
| 128 | |
| 129 | /* We have to enable the device before discovering SEs */ |
| 130 | if (dev->ops->discover_se) { |
| 131 | rc = dev->ops->discover_se(dev); |
| 132 | if (!rc) |
| 133 | pr_warn("SE discovery failed\n"); |
| 134 | } |
| 135 | |
| 136 | error: |
| 137 | device_unlock(&dev->dev); |
| 138 | return rc; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * nfc_dev_down - turn off the NFC device |
| 143 | * |
| 144 | * @dev: The nfc device to be turned off |
| 145 | */ |
| 146 | int nfc_dev_down(struct nfc_dev *dev) |
| 147 | { |
| 148 | int rc = 0; |
| 149 | |
| 150 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 151 | |
| 152 | device_lock(&dev->dev); |
| 153 | |
| 154 | if (!device_is_registered(&dev->dev)) { |
| 155 | rc = -ENODEV; |
| 156 | goto error; |
| 157 | } |
| 158 | |
| 159 | if (!dev->dev_up) { |
| 160 | rc = -EALREADY; |
| 161 | goto error; |
| 162 | } |
| 163 | |
| 164 | if (dev->polling || dev->active_target) { |
| 165 | rc = -EBUSY; |
| 166 | goto error; |
| 167 | } |
| 168 | |
| 169 | if (dev->ops->dev_down) |
| 170 | dev->ops->dev_down(dev); |
| 171 | |
| 172 | dev->dev_up = false; |
| 173 | |
| 174 | error: |
| 175 | device_unlock(&dev->dev); |
| 176 | return rc; |
| 177 | } |
| 178 | |
| 179 | static int nfc_rfkill_set_block(void *data, bool blocked) |
| 180 | { |
| 181 | struct nfc_dev *dev = data; |
| 182 | |
| 183 | pr_debug("%s blocked %d", dev_name(&dev->dev), blocked); |
| 184 | |
| 185 | if (!blocked) |
| 186 | return 0; |
| 187 | |
| 188 | nfc_dev_down(dev); |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static const struct rfkill_ops nfc_rfkill_ops = { |
| 194 | .set_block = nfc_rfkill_set_block, |
| 195 | }; |
| 196 | |
| 197 | /** |
| 198 | * nfc_start_poll - start polling for nfc targets |
| 199 | * |
| 200 | * @dev: The nfc device that must start polling |
| 201 | * @protocols: bitset of nfc protocols that must be used for polling |
| 202 | * |
| 203 | * The device remains polling for targets until a target is found or |
| 204 | * the nfc_stop_poll function is called. |
| 205 | */ |
| 206 | int nfc_start_poll(struct nfc_dev *dev, u32 im_protocols, u32 tm_protocols) |
| 207 | { |
| 208 | int rc; |
| 209 | |
| 210 | pr_debug("dev_name %s initiator protocols 0x%x target protocols 0x%x\n", |
| 211 | dev_name(&dev->dev), im_protocols, tm_protocols); |
| 212 | |
| 213 | if (!im_protocols && !tm_protocols) |
| 214 | return -EINVAL; |
| 215 | |
| 216 | device_lock(&dev->dev); |
| 217 | |
| 218 | if (!device_is_registered(&dev->dev)) { |
| 219 | rc = -ENODEV; |
| 220 | goto error; |
| 221 | } |
| 222 | |
| 223 | if (!dev->dev_up) { |
| 224 | rc = -ENODEV; |
| 225 | goto error; |
| 226 | } |
| 227 | |
| 228 | if (dev->polling) { |
| 229 | rc = -EBUSY; |
| 230 | goto error; |
| 231 | } |
| 232 | |
| 233 | rc = dev->ops->start_poll(dev, im_protocols, tm_protocols); |
| 234 | if (!rc) { |
| 235 | dev->polling = true; |
| 236 | dev->rf_mode = NFC_RF_NONE; |
| 237 | } |
| 238 | |
| 239 | error: |
| 240 | device_unlock(&dev->dev); |
| 241 | return rc; |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * nfc_stop_poll - stop polling for nfc targets |
| 246 | * |
| 247 | * @dev: The nfc device that must stop polling |
| 248 | */ |
| 249 | int nfc_stop_poll(struct nfc_dev *dev) |
| 250 | { |
| 251 | int rc = 0; |
| 252 | |
| 253 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 254 | |
| 255 | device_lock(&dev->dev); |
| 256 | |
| 257 | if (!device_is_registered(&dev->dev)) { |
| 258 | rc = -ENODEV; |
| 259 | goto error; |
| 260 | } |
| 261 | |
| 262 | if (!dev->polling) { |
| 263 | rc = -EINVAL; |
| 264 | goto error; |
| 265 | } |
| 266 | |
| 267 | dev->ops->stop_poll(dev); |
| 268 | dev->polling = false; |
| 269 | dev->rf_mode = NFC_RF_NONE; |
| 270 | |
| 271 | error: |
| 272 | device_unlock(&dev->dev); |
| 273 | return rc; |
| 274 | } |
| 275 | |
| 276 | static struct nfc_target *nfc_find_target(struct nfc_dev *dev, u32 target_idx) |
| 277 | { |
| 278 | int i; |
| 279 | |
| 280 | if (dev->n_targets == 0) |
| 281 | return NULL; |
| 282 | |
| 283 | for (i = 0; i < dev->n_targets; i++) { |
| 284 | if (dev->targets[i].idx == target_idx) |
| 285 | return &dev->targets[i]; |
| 286 | } |
| 287 | |
| 288 | return NULL; |
| 289 | } |
| 290 | |
| 291 | int nfc_dep_link_up(struct nfc_dev *dev, int target_index, u8 comm_mode) |
| 292 | { |
| 293 | int rc = 0; |
| 294 | u8 *gb; |
| 295 | size_t gb_len; |
| 296 | struct nfc_target *target; |
| 297 | |
| 298 | pr_debug("dev_name=%s comm %d\n", dev_name(&dev->dev), comm_mode); |
| 299 | |
| 300 | if (!dev->ops->dep_link_up) |
| 301 | return -EOPNOTSUPP; |
| 302 | |
| 303 | device_lock(&dev->dev); |
| 304 | |
| 305 | if (!device_is_registered(&dev->dev)) { |
| 306 | rc = -ENODEV; |
| 307 | goto error; |
| 308 | } |
| 309 | |
| 310 | if (dev->dep_link_up == true) { |
| 311 | rc = -EALREADY; |
| 312 | goto error; |
| 313 | } |
| 314 | |
| 315 | gb = nfc_llcp_general_bytes(dev, &gb_len); |
| 316 | if (gb_len > NFC_MAX_GT_LEN) { |
| 317 | rc = -EINVAL; |
| 318 | goto error; |
| 319 | } |
| 320 | |
| 321 | target = nfc_find_target(dev, target_index); |
| 322 | if (target == NULL) { |
| 323 | rc = -ENOTCONN; |
| 324 | goto error; |
| 325 | } |
| 326 | |
| 327 | rc = dev->ops->dep_link_up(dev, target, comm_mode, gb, gb_len); |
| 328 | if (!rc) { |
| 329 | dev->active_target = target; |
| 330 | dev->rf_mode = NFC_RF_INITIATOR; |
| 331 | } |
| 332 | |
| 333 | error: |
| 334 | device_unlock(&dev->dev); |
| 335 | return rc; |
| 336 | } |
| 337 | |
| 338 | int nfc_dep_link_down(struct nfc_dev *dev) |
| 339 | { |
| 340 | int rc = 0; |
| 341 | |
| 342 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 343 | |
| 344 | if (!dev->ops->dep_link_down) |
| 345 | return -EOPNOTSUPP; |
| 346 | |
| 347 | device_lock(&dev->dev); |
| 348 | |
| 349 | if (!device_is_registered(&dev->dev)) { |
| 350 | rc = -ENODEV; |
| 351 | goto error; |
| 352 | } |
| 353 | |
| 354 | if (dev->dep_link_up == false) { |
| 355 | rc = -EALREADY; |
| 356 | goto error; |
| 357 | } |
| 358 | |
| 359 | rc = dev->ops->dep_link_down(dev); |
| 360 | if (!rc) { |
| 361 | dev->dep_link_up = false; |
| 362 | dev->active_target = NULL; |
| 363 | dev->rf_mode = NFC_RF_NONE; |
| 364 | nfc_llcp_mac_is_down(dev); |
| 365 | nfc_genl_dep_link_down_event(dev); |
| 366 | } |
| 367 | |
| 368 | error: |
| 369 | device_unlock(&dev->dev); |
| 370 | |
| 371 | return rc; |
| 372 | } |
| 373 | |
| 374 | int nfc_dep_link_is_up(struct nfc_dev *dev, u32 target_idx, |
| 375 | u8 comm_mode, u8 rf_mode) |
| 376 | { |
| 377 | dev->dep_link_up = true; |
| 378 | |
| 379 | nfc_llcp_mac_is_up(dev, target_idx, comm_mode, rf_mode); |
| 380 | |
| 381 | return nfc_genl_dep_link_up_event(dev, target_idx, comm_mode, rf_mode); |
| 382 | } |
| 383 | EXPORT_SYMBOL(nfc_dep_link_is_up); |
| 384 | |
| 385 | /** |
| 386 | * nfc_activate_target - prepare the target for data exchange |
| 387 | * |
| 388 | * @dev: The nfc device that found the target |
| 389 | * @target_idx: index of the target that must be activated |
| 390 | * @protocol: nfc protocol that will be used for data exchange |
| 391 | */ |
| 392 | int nfc_activate_target(struct nfc_dev *dev, u32 target_idx, u32 protocol) |
| 393 | { |
| 394 | int rc; |
| 395 | struct nfc_target *target; |
| 396 | |
| 397 | pr_debug("dev_name=%s target_idx=%u protocol=%u\n", |
| 398 | dev_name(&dev->dev), target_idx, protocol); |
| 399 | |
| 400 | device_lock(&dev->dev); |
| 401 | |
| 402 | if (!device_is_registered(&dev->dev)) { |
| 403 | rc = -ENODEV; |
| 404 | goto error; |
| 405 | } |
| 406 | |
| 407 | if (dev->active_target) { |
| 408 | rc = -EBUSY; |
| 409 | goto error; |
| 410 | } |
| 411 | |
| 412 | target = nfc_find_target(dev, target_idx); |
| 413 | if (target == NULL) { |
| 414 | rc = -ENOTCONN; |
| 415 | goto error; |
| 416 | } |
| 417 | |
| 418 | rc = dev->ops->activate_target(dev, target, protocol); |
| 419 | if (!rc) { |
| 420 | dev->active_target = target; |
| 421 | dev->rf_mode = NFC_RF_INITIATOR; |
| 422 | |
| 423 | if (dev->ops->check_presence && !dev->shutting_down) |
| 424 | mod_timer(&dev->check_pres_timer, jiffies + |
| 425 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
| 426 | } |
| 427 | |
| 428 | error: |
| 429 | device_unlock(&dev->dev); |
| 430 | return rc; |
| 431 | } |
| 432 | |
| 433 | /** |
| 434 | * nfc_deactivate_target - deactivate a nfc target |
| 435 | * |
| 436 | * @dev: The nfc device that found the target |
| 437 | * @target_idx: index of the target that must be deactivated |
| 438 | */ |
| 439 | int nfc_deactivate_target(struct nfc_dev *dev, u32 target_idx) |
| 440 | { |
| 441 | int rc = 0; |
| 442 | |
| 443 | pr_debug("dev_name=%s target_idx=%u\n", |
| 444 | dev_name(&dev->dev), target_idx); |
| 445 | |
| 446 | device_lock(&dev->dev); |
| 447 | |
| 448 | if (!device_is_registered(&dev->dev)) { |
| 449 | rc = -ENODEV; |
| 450 | goto error; |
| 451 | } |
| 452 | |
| 453 | if (dev->active_target == NULL) { |
| 454 | rc = -ENOTCONN; |
| 455 | goto error; |
| 456 | } |
| 457 | |
| 458 | if (dev->active_target->idx != target_idx) { |
| 459 | rc = -ENOTCONN; |
| 460 | goto error; |
| 461 | } |
| 462 | |
| 463 | if (dev->ops->check_presence) |
| 464 | del_timer_sync(&dev->check_pres_timer); |
| 465 | |
| 466 | dev->ops->deactivate_target(dev, dev->active_target); |
| 467 | dev->active_target = NULL; |
| 468 | |
| 469 | error: |
| 470 | device_unlock(&dev->dev); |
| 471 | return rc; |
| 472 | } |
| 473 | |
| 474 | /** |
| 475 | * nfc_data_exchange - transceive data |
| 476 | * |
| 477 | * @dev: The nfc device that found the target |
| 478 | * @target_idx: index of the target |
| 479 | * @skb: data to be sent |
| 480 | * @cb: callback called when the response is received |
| 481 | * @cb_context: parameter for the callback function |
| 482 | * |
| 483 | * The user must wait for the callback before calling this function again. |
| 484 | */ |
| 485 | int nfc_data_exchange(struct nfc_dev *dev, u32 target_idx, struct sk_buff *skb, |
| 486 | data_exchange_cb_t cb, void *cb_context) |
| 487 | { |
| 488 | int rc; |
| 489 | |
| 490 | pr_debug("dev_name=%s target_idx=%u skb->len=%u\n", |
| 491 | dev_name(&dev->dev), target_idx, skb->len); |
| 492 | |
| 493 | device_lock(&dev->dev); |
| 494 | |
| 495 | if (!device_is_registered(&dev->dev)) { |
| 496 | rc = -ENODEV; |
| 497 | kfree_skb(skb); |
| 498 | goto error; |
| 499 | } |
| 500 | |
| 501 | if (dev->rf_mode == NFC_RF_INITIATOR && dev->active_target != NULL) { |
| 502 | if (dev->active_target->idx != target_idx) { |
| 503 | rc = -EADDRNOTAVAIL; |
| 504 | kfree_skb(skb); |
| 505 | goto error; |
| 506 | } |
| 507 | |
| 508 | if (dev->ops->check_presence) |
| 509 | del_timer_sync(&dev->check_pres_timer); |
| 510 | |
| 511 | rc = dev->ops->im_transceive(dev, dev->active_target, skb, cb, |
| 512 | cb_context); |
| 513 | |
| 514 | if (!rc && dev->ops->check_presence && !dev->shutting_down) |
| 515 | mod_timer(&dev->check_pres_timer, jiffies + |
| 516 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
| 517 | } else if (dev->rf_mode == NFC_RF_TARGET && dev->ops->tm_send != NULL) { |
| 518 | rc = dev->ops->tm_send(dev, skb); |
| 519 | } else { |
| 520 | rc = -ENOTCONN; |
| 521 | kfree_skb(skb); |
| 522 | goto error; |
| 523 | } |
| 524 | |
| 525 | |
| 526 | error: |
| 527 | device_unlock(&dev->dev); |
| 528 | return rc; |
| 529 | } |
| 530 | |
| 531 | int nfc_set_remote_general_bytes(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
| 532 | { |
| 533 | pr_debug("dev_name=%s gb_len=%d\n", dev_name(&dev->dev), gb_len); |
| 534 | |
| 535 | if (gb_len > NFC_MAX_GT_LEN) |
| 536 | return -EINVAL; |
| 537 | |
| 538 | return nfc_llcp_set_remote_gb(dev, gb, gb_len); |
| 539 | } |
| 540 | EXPORT_SYMBOL(nfc_set_remote_general_bytes); |
| 541 | |
| 542 | u8 *nfc_get_local_general_bytes(struct nfc_dev *dev, size_t *gb_len) |
| 543 | { |
| 544 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 545 | |
| 546 | return nfc_llcp_general_bytes(dev, gb_len); |
| 547 | } |
| 548 | EXPORT_SYMBOL(nfc_get_local_general_bytes); |
| 549 | |
| 550 | int nfc_tm_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
| 551 | { |
| 552 | /* Only LLCP target mode for now */ |
| 553 | if (dev->dep_link_up == false) { |
| 554 | kfree_skb(skb); |
| 555 | return -ENOLINK; |
| 556 | } |
| 557 | |
| 558 | return nfc_llcp_data_received(dev, skb); |
| 559 | } |
| 560 | EXPORT_SYMBOL(nfc_tm_data_received); |
| 561 | |
| 562 | int nfc_tm_activated(struct nfc_dev *dev, u32 protocol, u8 comm_mode, |
| 563 | u8 *gb, size_t gb_len) |
| 564 | { |
| 565 | int rc; |
| 566 | |
| 567 | device_lock(&dev->dev); |
| 568 | |
| 569 | dev->polling = false; |
| 570 | |
| 571 | if (gb != NULL) { |
| 572 | rc = nfc_set_remote_general_bytes(dev, gb, gb_len); |
| 573 | if (rc < 0) |
| 574 | goto out; |
| 575 | } |
| 576 | |
| 577 | dev->rf_mode = NFC_RF_TARGET; |
| 578 | |
| 579 | if (protocol == NFC_PROTO_NFC_DEP_MASK) |
| 580 | nfc_dep_link_is_up(dev, 0, comm_mode, NFC_RF_TARGET); |
| 581 | |
| 582 | rc = nfc_genl_tm_activated(dev, protocol); |
| 583 | |
| 584 | out: |
| 585 | device_unlock(&dev->dev); |
| 586 | |
| 587 | return rc; |
| 588 | } |
| 589 | EXPORT_SYMBOL(nfc_tm_activated); |
| 590 | |
| 591 | int nfc_tm_deactivated(struct nfc_dev *dev) |
| 592 | { |
| 593 | dev->dep_link_up = false; |
| 594 | dev->rf_mode = NFC_RF_NONE; |
| 595 | |
| 596 | return nfc_genl_tm_deactivated(dev); |
| 597 | } |
| 598 | EXPORT_SYMBOL(nfc_tm_deactivated); |
| 599 | |
| 600 | /** |
| 601 | * nfc_alloc_send_skb - allocate a skb for data exchange responses |
| 602 | * |
| 603 | * @size: size to allocate |
| 604 | * @gfp: gfp flags |
| 605 | */ |
| 606 | struct sk_buff *nfc_alloc_send_skb(struct nfc_dev *dev, struct sock *sk, |
| 607 | unsigned int flags, unsigned int size, |
| 608 | unsigned int *err) |
| 609 | { |
| 610 | struct sk_buff *skb; |
| 611 | unsigned int total_size; |
| 612 | |
| 613 | total_size = size + |
| 614 | dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
| 615 | |
| 616 | skb = sock_alloc_send_skb(sk, total_size, flags & MSG_DONTWAIT, err); |
| 617 | if (skb) |
| 618 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
| 619 | |
| 620 | return skb; |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * nfc_alloc_recv_skb - allocate a skb for data exchange responses |
| 625 | * |
| 626 | * @size: size to allocate |
| 627 | * @gfp: gfp flags |
| 628 | */ |
| 629 | struct sk_buff *nfc_alloc_recv_skb(unsigned int size, gfp_t gfp) |
| 630 | { |
| 631 | struct sk_buff *skb; |
| 632 | unsigned int total_size; |
| 633 | |
| 634 | total_size = size + 1; |
| 635 | skb = alloc_skb(total_size, gfp); |
| 636 | |
| 637 | if (skb) |
| 638 | skb_reserve(skb, 1); |
| 639 | |
| 640 | return skb; |
| 641 | } |
| 642 | EXPORT_SYMBOL(nfc_alloc_recv_skb); |
| 643 | |
| 644 | /** |
| 645 | * nfc_targets_found - inform that targets were found |
| 646 | * |
| 647 | * @dev: The nfc device that found the targets |
| 648 | * @targets: array of nfc targets found |
| 649 | * @ntargets: targets array size |
| 650 | * |
| 651 | * The device driver must call this function when one or many nfc targets |
| 652 | * are found. After calling this function, the device driver must stop |
| 653 | * polling for targets. |
| 654 | * NOTE: This function can be called with targets=NULL and n_targets=0 to |
| 655 | * notify a driver error, meaning that the polling operation cannot complete. |
| 656 | * IMPORTANT: this function must not be called from an atomic context. |
| 657 | * In addition, it must also not be called from a context that would prevent |
| 658 | * the NFC Core to call other nfc ops entry point concurrently. |
| 659 | */ |
| 660 | int nfc_targets_found(struct nfc_dev *dev, |
| 661 | struct nfc_target *targets, int n_targets) |
| 662 | { |
| 663 | int i; |
| 664 | |
| 665 | pr_debug("dev_name=%s n_targets=%d\n", dev_name(&dev->dev), n_targets); |
| 666 | |
| 667 | for (i = 0; i < n_targets; i++) |
| 668 | targets[i].idx = dev->target_next_idx++; |
| 669 | |
| 670 | device_lock(&dev->dev); |
| 671 | |
| 672 | if (dev->polling == false) { |
| 673 | device_unlock(&dev->dev); |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | dev->polling = false; |
| 678 | |
| 679 | dev->targets_generation++; |
| 680 | |
| 681 | kfree(dev->targets); |
| 682 | dev->targets = NULL; |
| 683 | |
| 684 | if (targets) { |
| 685 | dev->targets = kmemdup(targets, |
| 686 | n_targets * sizeof(struct nfc_target), |
| 687 | GFP_ATOMIC); |
| 688 | |
| 689 | if (!dev->targets) { |
| 690 | dev->n_targets = 0; |
| 691 | device_unlock(&dev->dev); |
| 692 | return -ENOMEM; |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | dev->n_targets = n_targets; |
| 697 | device_unlock(&dev->dev); |
| 698 | |
| 699 | nfc_genl_targets_found(dev); |
| 700 | |
| 701 | return 0; |
| 702 | } |
| 703 | EXPORT_SYMBOL(nfc_targets_found); |
| 704 | |
| 705 | /** |
| 706 | * nfc_target_lost - inform that an activated target went out of field |
| 707 | * |
| 708 | * @dev: The nfc device that had the activated target in field |
| 709 | * @target_idx: the nfc index of the target |
| 710 | * |
| 711 | * The device driver must call this function when the activated target |
| 712 | * goes out of the field. |
| 713 | * IMPORTANT: this function must not be called from an atomic context. |
| 714 | * In addition, it must also not be called from a context that would prevent |
| 715 | * the NFC Core to call other nfc ops entry point concurrently. |
| 716 | */ |
| 717 | int nfc_target_lost(struct nfc_dev *dev, u32 target_idx) |
| 718 | { |
| 719 | struct nfc_target *tg; |
| 720 | int i; |
| 721 | |
| 722 | pr_debug("dev_name %s n_target %d\n", dev_name(&dev->dev), target_idx); |
| 723 | |
| 724 | device_lock(&dev->dev); |
| 725 | |
| 726 | for (i = 0; i < dev->n_targets; i++) { |
| 727 | tg = &dev->targets[i]; |
| 728 | if (tg->idx == target_idx) |
| 729 | break; |
| 730 | } |
| 731 | |
| 732 | if (i == dev->n_targets) { |
| 733 | device_unlock(&dev->dev); |
| 734 | return -EINVAL; |
| 735 | } |
| 736 | |
| 737 | dev->targets_generation++; |
| 738 | dev->n_targets--; |
| 739 | dev->active_target = NULL; |
| 740 | |
| 741 | if (dev->n_targets) { |
| 742 | memcpy(&dev->targets[i], &dev->targets[i + 1], |
| 743 | (dev->n_targets - i) * sizeof(struct nfc_target)); |
| 744 | } else { |
| 745 | kfree(dev->targets); |
| 746 | dev->targets = NULL; |
| 747 | } |
| 748 | |
| 749 | device_unlock(&dev->dev); |
| 750 | |
| 751 | nfc_genl_target_lost(dev, target_idx); |
| 752 | |
| 753 | return 0; |
| 754 | } |
| 755 | EXPORT_SYMBOL(nfc_target_lost); |
| 756 | |
| 757 | inline void nfc_driver_failure(struct nfc_dev *dev, int err) |
| 758 | { |
| 759 | nfc_targets_found(dev, NULL, 0); |
| 760 | } |
| 761 | EXPORT_SYMBOL(nfc_driver_failure); |
| 762 | |
| 763 | int nfc_add_se(struct nfc_dev *dev, u32 se_idx, u16 type) |
| 764 | { |
| 765 | struct nfc_se *se, *n; |
| 766 | int rc; |
| 767 | |
| 768 | pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx); |
| 769 | |
| 770 | list_for_each_entry_safe(se, n, &dev->secure_elements, list) |
| 771 | if (se->idx == se_idx) |
| 772 | return -EALREADY; |
| 773 | |
| 774 | se = kzalloc(sizeof(struct nfc_se), GFP_KERNEL); |
| 775 | if (!se) |
| 776 | return -ENOMEM; |
| 777 | |
| 778 | se->idx = se_idx; |
| 779 | se->type = type; |
| 780 | se->state = NFC_SE_DISABLED; |
| 781 | INIT_LIST_HEAD(&se->list); |
| 782 | |
| 783 | list_add(&se->list, &dev->secure_elements); |
| 784 | |
| 785 | rc = nfc_genl_se_added(dev, se_idx, type); |
| 786 | if (rc < 0) { |
| 787 | list_del(&se->list); |
| 788 | kfree(se); |
| 789 | |
| 790 | return rc; |
| 791 | } |
| 792 | |
| 793 | return 0; |
| 794 | } |
| 795 | EXPORT_SYMBOL(nfc_add_se); |
| 796 | |
| 797 | int nfc_remove_se(struct nfc_dev *dev, u32 se_idx) |
| 798 | { |
| 799 | struct nfc_se *se, *n; |
| 800 | int rc; |
| 801 | |
| 802 | pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx); |
| 803 | |
| 804 | list_for_each_entry_safe(se, n, &dev->secure_elements, list) |
| 805 | if (se->idx == se_idx) { |
| 806 | rc = nfc_genl_se_removed(dev, se_idx); |
| 807 | if (rc < 0) |
| 808 | return rc; |
| 809 | |
| 810 | list_del(&se->list); |
| 811 | kfree(se); |
| 812 | |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | return -EINVAL; |
| 817 | } |
| 818 | EXPORT_SYMBOL(nfc_remove_se); |
| 819 | |
| 820 | static void nfc_release(struct device *d) |
| 821 | { |
| 822 | struct nfc_dev *dev = to_nfc_dev(d); |
| 823 | |
| 824 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 825 | |
| 826 | nfc_genl_data_exit(&dev->genl_data); |
| 827 | kfree(dev->targets); |
| 828 | kfree(dev); |
| 829 | } |
| 830 | |
| 831 | static void nfc_check_pres_work(struct work_struct *work) |
| 832 | { |
| 833 | struct nfc_dev *dev = container_of(work, struct nfc_dev, |
| 834 | check_pres_work); |
| 835 | int rc; |
| 836 | |
| 837 | device_lock(&dev->dev); |
| 838 | |
| 839 | if (dev->active_target && timer_pending(&dev->check_pres_timer) == 0) { |
| 840 | rc = dev->ops->check_presence(dev, dev->active_target); |
| 841 | if (rc == -EOPNOTSUPP) |
| 842 | goto exit; |
| 843 | if (rc) { |
| 844 | u32 active_target_idx = dev->active_target->idx; |
| 845 | device_unlock(&dev->dev); |
| 846 | nfc_target_lost(dev, active_target_idx); |
| 847 | return; |
| 848 | } |
| 849 | |
| 850 | if (!dev->shutting_down) |
| 851 | mod_timer(&dev->check_pres_timer, jiffies + |
| 852 | msecs_to_jiffies(NFC_CHECK_PRES_FREQ_MS)); |
| 853 | } |
| 854 | |
| 855 | exit: |
| 856 | device_unlock(&dev->dev); |
| 857 | } |
| 858 | |
| 859 | static void nfc_check_pres_timeout(unsigned long data) |
| 860 | { |
| 861 | struct nfc_dev *dev = (struct nfc_dev *)data; |
| 862 | |
| 863 | schedule_work(&dev->check_pres_work); |
| 864 | } |
| 865 | |
| 866 | struct class nfc_class = { |
| 867 | .name = "nfc", |
| 868 | .dev_release = nfc_release, |
| 869 | }; |
| 870 | EXPORT_SYMBOL(nfc_class); |
| 871 | |
| 872 | static int match_idx(struct device *d, const void *data) |
| 873 | { |
| 874 | struct nfc_dev *dev = to_nfc_dev(d); |
| 875 | const unsigned int *idx = data; |
| 876 | |
| 877 | return dev->idx == *idx; |
| 878 | } |
| 879 | |
| 880 | struct nfc_dev *nfc_get_device(unsigned int idx) |
| 881 | { |
| 882 | struct device *d; |
| 883 | |
| 884 | d = class_find_device(&nfc_class, NULL, &idx, match_idx); |
| 885 | if (!d) |
| 886 | return NULL; |
| 887 | |
| 888 | return to_nfc_dev(d); |
| 889 | } |
| 890 | |
| 891 | /** |
| 892 | * nfc_allocate_device - allocate a new nfc device |
| 893 | * |
| 894 | * @ops: device operations |
| 895 | * @supported_protocols: NFC protocols supported by the device |
| 896 | */ |
| 897 | struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops, |
| 898 | u32 supported_protocols, |
| 899 | int tx_headroom, int tx_tailroom) |
| 900 | { |
| 901 | struct nfc_dev *dev; |
| 902 | |
| 903 | if (!ops->start_poll || !ops->stop_poll || !ops->activate_target || |
| 904 | !ops->deactivate_target || !ops->im_transceive) |
| 905 | return NULL; |
| 906 | |
| 907 | if (!supported_protocols) |
| 908 | return NULL; |
| 909 | |
| 910 | dev = kzalloc(sizeof(struct nfc_dev), GFP_KERNEL); |
| 911 | if (!dev) |
| 912 | return NULL; |
| 913 | |
| 914 | dev->ops = ops; |
| 915 | dev->supported_protocols = supported_protocols; |
| 916 | dev->tx_headroom = tx_headroom; |
| 917 | dev->tx_tailroom = tx_tailroom; |
| 918 | INIT_LIST_HEAD(&dev->secure_elements); |
| 919 | |
| 920 | nfc_genl_data_init(&dev->genl_data); |
| 921 | |
| 922 | dev->rf_mode = NFC_RF_NONE; |
| 923 | |
| 924 | /* first generation must not be 0 */ |
| 925 | dev->targets_generation = 1; |
| 926 | |
| 927 | if (ops->check_presence) { |
| 928 | init_timer(&dev->check_pres_timer); |
| 929 | dev->check_pres_timer.data = (unsigned long)dev; |
| 930 | dev->check_pres_timer.function = nfc_check_pres_timeout; |
| 931 | |
| 932 | INIT_WORK(&dev->check_pres_work, nfc_check_pres_work); |
| 933 | } |
| 934 | |
| 935 | return dev; |
| 936 | } |
| 937 | EXPORT_SYMBOL(nfc_allocate_device); |
| 938 | |
| 939 | /** |
| 940 | * nfc_register_device - register a nfc device in the nfc subsystem |
| 941 | * |
| 942 | * @dev: The nfc device to register |
| 943 | */ |
| 944 | int nfc_register_device(struct nfc_dev *dev) |
| 945 | { |
| 946 | int rc; |
| 947 | |
| 948 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 949 | |
| 950 | dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL); |
| 951 | if (dev->idx < 0) |
| 952 | return dev->idx; |
| 953 | |
| 954 | dev->dev.class = &nfc_class; |
| 955 | dev_set_name(&dev->dev, "nfc%d", dev->idx); |
| 956 | device_initialize(&dev->dev); |
| 957 | |
| 958 | mutex_lock(&nfc_devlist_mutex); |
| 959 | nfc_devlist_generation++; |
| 960 | rc = device_add(&dev->dev); |
| 961 | mutex_unlock(&nfc_devlist_mutex); |
| 962 | |
| 963 | if (rc < 0) |
| 964 | return rc; |
| 965 | |
| 966 | rc = nfc_llcp_register_device(dev); |
| 967 | if (rc) |
| 968 | pr_err("Could not register llcp device\n"); |
| 969 | |
| 970 | rc = nfc_genl_device_added(dev); |
| 971 | if (rc) |
| 972 | pr_debug("The userspace won't be notified that the device %s was added\n", |
| 973 | dev_name(&dev->dev)); |
| 974 | |
| 975 | dev->rfkill = rfkill_alloc(dev_name(&dev->dev), &dev->dev, |
| 976 | RFKILL_TYPE_NFC, &nfc_rfkill_ops, dev); |
| 977 | if (dev->rfkill) { |
| 978 | if (rfkill_register(dev->rfkill) < 0) { |
| 979 | rfkill_destroy(dev->rfkill); |
| 980 | dev->rfkill = NULL; |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | return 0; |
| 985 | } |
| 986 | EXPORT_SYMBOL(nfc_register_device); |
| 987 | |
| 988 | /** |
| 989 | * nfc_unregister_device - unregister a nfc device in the nfc subsystem |
| 990 | * |
| 991 | * @dev: The nfc device to unregister |
| 992 | */ |
| 993 | void nfc_unregister_device(struct nfc_dev *dev) |
| 994 | { |
| 995 | int rc, id; |
| 996 | |
| 997 | pr_debug("dev_name=%s\n", dev_name(&dev->dev)); |
| 998 | |
| 999 | id = dev->idx; |
| 1000 | |
| 1001 | if (dev->rfkill) { |
| 1002 | rfkill_unregister(dev->rfkill); |
| 1003 | rfkill_destroy(dev->rfkill); |
| 1004 | } |
| 1005 | |
| 1006 | if (dev->ops->check_presence) { |
| 1007 | device_lock(&dev->dev); |
| 1008 | dev->shutting_down = true; |
| 1009 | device_unlock(&dev->dev); |
| 1010 | del_timer_sync(&dev->check_pres_timer); |
| 1011 | cancel_work_sync(&dev->check_pres_work); |
| 1012 | } |
| 1013 | |
| 1014 | rc = nfc_genl_device_removed(dev); |
| 1015 | if (rc) |
| 1016 | pr_debug("The userspace won't be notified that the device %s " |
| 1017 | "was removed\n", dev_name(&dev->dev)); |
| 1018 | |
| 1019 | nfc_llcp_unregister_device(dev); |
| 1020 | |
| 1021 | mutex_lock(&nfc_devlist_mutex); |
| 1022 | nfc_devlist_generation++; |
| 1023 | device_del(&dev->dev); |
| 1024 | mutex_unlock(&nfc_devlist_mutex); |
| 1025 | |
| 1026 | ida_simple_remove(&nfc_index_ida, id); |
| 1027 | } |
| 1028 | EXPORT_SYMBOL(nfc_unregister_device); |
| 1029 | |
| 1030 | static int __init nfc_init(void) |
| 1031 | { |
| 1032 | int rc; |
| 1033 | |
| 1034 | pr_info("NFC Core ver %s\n", VERSION); |
| 1035 | |
| 1036 | rc = class_register(&nfc_class); |
| 1037 | if (rc) |
| 1038 | return rc; |
| 1039 | |
| 1040 | rc = nfc_genl_init(); |
| 1041 | if (rc) |
| 1042 | goto err_genl; |
| 1043 | |
| 1044 | /* the first generation must not be 0 */ |
| 1045 | nfc_devlist_generation = 1; |
| 1046 | |
| 1047 | rc = rawsock_init(); |
| 1048 | if (rc) |
| 1049 | goto err_rawsock; |
| 1050 | |
| 1051 | rc = nfc_llcp_init(); |
| 1052 | if (rc) |
| 1053 | goto err_llcp_sock; |
| 1054 | |
| 1055 | rc = af_nfc_init(); |
| 1056 | if (rc) |
| 1057 | goto err_af_nfc; |
| 1058 | |
| 1059 | return 0; |
| 1060 | |
| 1061 | err_af_nfc: |
| 1062 | nfc_llcp_exit(); |
| 1063 | err_llcp_sock: |
| 1064 | rawsock_exit(); |
| 1065 | err_rawsock: |
| 1066 | nfc_genl_exit(); |
| 1067 | err_genl: |
| 1068 | class_unregister(&nfc_class); |
| 1069 | return rc; |
| 1070 | } |
| 1071 | |
| 1072 | static void __exit nfc_exit(void) |
| 1073 | { |
| 1074 | af_nfc_exit(); |
| 1075 | nfc_llcp_exit(); |
| 1076 | rawsock_exit(); |
| 1077 | nfc_genl_exit(); |
| 1078 | class_unregister(&nfc_class); |
| 1079 | } |
| 1080 | |
| 1081 | subsys_initcall(nfc_init); |
| 1082 | module_exit(nfc_exit); |
| 1083 | |
| 1084 | MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>"); |
| 1085 | MODULE_DESCRIPTION("NFC Core ver " VERSION); |
| 1086 | MODULE_VERSION(VERSION); |
| 1087 | MODULE_LICENSE("GPL"); |
| 1088 | MODULE_ALIAS_NETPROTO(PF_NFC); |
| 1089 | MODULE_ALIAS_GENL_FAMILY(NFC_GENL_NAME); |