1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * LIRC base driver 4 * 5 * by Artur Lipowski <alipowski@interia.pl> 6 */ 7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10#include <linux/module.h> 11#include <linux/mutex.h> 12#include <linux/device.h> 13#include <linux/file.h> 14#include <linux/idr.h> 15#include <linux/poll.h> 16#include <linux/sched.h> 17#include <linux/wait.h> 18 19#include "rc-core-priv.h" 20#include <uapi/linux/lirc.h> 21 22#define LIRCBUF_SIZE 1024 23 24static dev_t lirc_base_dev; 25 26/* Used to keep track of allocated lirc devices */ 27static DEFINE_IDA(lirc_ida); 28 29/* Only used for sysfs but defined to void otherwise */ 30static struct class *lirc_class; 31 32/** 33 * lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace 34 * 35 * @dev: the struct rc_dev descriptor of the device 36 * @ev: the struct ir_raw_event descriptor of the pulse/space 37 */ 38void lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev) 39{ 40 unsigned long flags; 41 struct lirc_fh *fh; 42 int sample; 43 44 /* Receiver overflow, data missing */ 45 if (ev.overflow) { 46 /* 47 * Send lirc overflow message. This message is unknown to 48 * lircd, but it will interpret this as a long space as 49 * long as the value is set to high value. This resets its 50 * decoder state. 51 */ 52 sample = LIRC_OVERFLOW(LIRC_VALUE_MASK); 53 dev_dbg(&dev->dev, "delivering overflow to lirc_dev\n"); 54 55 /* Carrier reports */ 56 } else if (ev.carrier_report) { 57 sample = LIRC_FREQUENCY(ev.carrier); 58 dev_dbg(&dev->dev, "carrier report (freq: %d)\n", sample); 59 60 /* Packet end */ 61 } else if (ev.timeout) { 62 dev->gap_start = ktime_get(); 63 64 sample = LIRC_TIMEOUT(ev.duration); 65 dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample); 66 67 /* Normal sample */ 68 } else { 69 if (dev->gap_start) { 70 u64 duration = ktime_us_delta(ktime_get(), 71 dev->gap_start); 72 73 /* Cap by LIRC_VALUE_MASK */ 74 duration = min_t(u64, duration, LIRC_VALUE_MASK); 75 76 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 77 list_for_each_entry(fh, &dev->lirc_fh, list) 78 kfifo_put(&fh->rawir, LIRC_SPACE(duration)); 79 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 80 dev->gap_start = 0; 81 } 82 83 sample = ev.pulse ? LIRC_PULSE(ev.duration) : 84 LIRC_SPACE(ev.duration); 85 dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n", 86 ev.duration, TO_STR(ev.pulse)); 87 } 88 89 /* 90 * bpf does not care about the gap generated above; that exists 91 * for backwards compatibility 92 */ 93 lirc_bpf_run(dev, sample); 94 95 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 96 list_for_each_entry(fh, &dev->lirc_fh, list) { 97 if (kfifo_put(&fh->rawir, sample)) 98 wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM); 99 } 100 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 101} 102 103/** 104 * lirc_scancode_event() - Send scancode data to lirc to be relayed to 105 * userspace. This can be called in atomic context. 106 * @dev: the struct rc_dev descriptor of the device 107 * @lsc: the struct lirc_scancode describing the decoded scancode 108 */ 109void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc) 110{ 111 unsigned long flags; 112 struct lirc_fh *fh; 113 114 lsc->timestamp = ktime_get_ns(); 115 116 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 117 list_for_each_entry(fh, &dev->lirc_fh, list) { 118 if (kfifo_put(&fh->scancodes, *lsc)) 119 wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM); 120 } 121 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 122} 123EXPORT_SYMBOL_GPL(lirc_scancode_event); 124 125static int lirc_open(struct inode *inode, struct file *file) 126{ 127 struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev, 128 lirc_cdev); 129 struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL); 130 unsigned long flags; 131 int retval; 132 133 if (!fh) 134 return -ENOMEM; 135 136 get_device(&dev->dev); 137 138 if (!dev->registered) { 139 retval = -ENODEV; 140 goto out_fh; 141 } 142 143 if (dev->driver_type == RC_DRIVER_IR_RAW) { 144 if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) { 145 retval = -ENOMEM; 146 goto out_fh; 147 } 148 } 149 150 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) { 151 if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) { 152 retval = -ENOMEM; 153 goto out_rawir; 154 } 155 } 156 157 fh->send_mode = LIRC_MODE_PULSE; 158 fh->rc = dev; 159 160 if (dev->driver_type == RC_DRIVER_SCANCODE) 161 fh->rec_mode = LIRC_MODE_SCANCODE; 162 else 163 fh->rec_mode = LIRC_MODE_MODE2; 164 165 retval = rc_open(dev); 166 if (retval) 167 goto out_kfifo; 168 169 init_waitqueue_head(&fh->wait_poll); 170 171 file->private_data = fh; 172 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 173 list_add(&fh->list, &dev->lirc_fh); 174 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 175 176 stream_open(inode, file); 177 178 return 0; 179out_kfifo: 180 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) 181 kfifo_free(&fh->scancodes); 182out_rawir: 183 if (dev->driver_type == RC_DRIVER_IR_RAW) 184 kfifo_free(&fh->rawir); 185out_fh: 186 kfree(fh); 187 put_device(&dev->dev); 188 189 return retval; 190} 191 192static int lirc_close(struct inode *inode, struct file *file) 193{ 194 struct lirc_fh *fh = file->private_data; 195 struct rc_dev *dev = fh->rc; 196 unsigned long flags; 197 198 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 199 list_del(&fh->list); 200 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 201 202 if (dev->driver_type == RC_DRIVER_IR_RAW) 203 kfifo_free(&fh->rawir); 204 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) 205 kfifo_free(&fh->scancodes); 206 kfree(fh); 207 208 rc_close(dev); 209 put_device(&dev->dev); 210 211 return 0; 212} 213 214static ssize_t lirc_transmit(struct file *file, const char __user *buf, 215 size_t n, loff_t *ppos) 216{ 217 struct lirc_fh *fh = file->private_data; 218 struct rc_dev *dev = fh->rc; 219 unsigned int *txbuf; 220 struct ir_raw_event *raw = NULL; 221 ssize_t ret; 222 size_t count; 223 ktime_t start; 224 s64 towait; 225 unsigned int duration = 0; /* signal duration in us */ 226 int i; 227 228 ret = mutex_lock_interruptible(&dev->lock); 229 if (ret) 230 return ret; 231 232 if (!dev->registered) { 233 ret = -ENODEV; 234 goto out_unlock; 235 } 236 237 if (!dev->tx_ir) { 238 ret = -EINVAL; 239 goto out_unlock; 240 } 241 242 if (fh->send_mode == LIRC_MODE_SCANCODE) { 243 struct lirc_scancode scan; 244 245 if (n != sizeof(scan)) { 246 ret = -EINVAL; 247 goto out_unlock; 248 } 249 250 if (copy_from_user(&scan, buf, sizeof(scan))) { 251 ret = -EFAULT; 252 goto out_unlock; 253 } 254 255 if (scan.flags || scan.keycode || scan.timestamp || 256 scan.rc_proto > RC_PROTO_MAX) { 257 ret = -EINVAL; 258 goto out_unlock; 259 } 260 261 /* We only have encoders for 32-bit protocols. */ 262 if (scan.scancode > U32_MAX || 263 !rc_validate_scancode(scan.rc_proto, scan.scancode)) { 264 ret = -EINVAL; 265 goto out_unlock; 266 } 267 268 raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL); 269 if (!raw) { 270 ret = -ENOMEM; 271 goto out_unlock; 272 } 273 274 ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode, 275 raw, LIRCBUF_SIZE); 276 if (ret < 0) 277 goto out_kfree_raw; 278 279 /* drop trailing space */ 280 if (!(ret % 2)) 281 count = ret - 1; 282 else 283 count = ret; 284 285 txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL); 286 if (!txbuf) { 287 ret = -ENOMEM; 288 goto out_kfree_raw; 289 } 290 291 for (i = 0; i < count; i++) 292 txbuf[i] = raw[i].duration; 293 294 if (dev->s_tx_carrier) { 295 int carrier = ir_raw_encode_carrier(scan.rc_proto); 296 297 if (carrier > 0) 298 dev->s_tx_carrier(dev, carrier); 299 } 300 } else { 301 if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) { 302 ret = -EINVAL; 303 goto out_unlock; 304 } 305 306 count = n / sizeof(unsigned int); 307 if (count > LIRCBUF_SIZE || count % 2 == 0) { 308 ret = -EINVAL; 309 goto out_unlock; 310 } 311 312 txbuf = memdup_user(buf, n); 313 if (IS_ERR(txbuf)) { 314 ret = PTR_ERR(txbuf); 315 goto out_unlock; 316 } 317 } 318 319 for (i = 0; i < count; i++) { 320 if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) { 321 ret = -EINVAL; 322 goto out_kfree; 323 } 324 325 duration += txbuf[i]; 326 } 327 328 start = ktime_get(); 329 330 ret = dev->tx_ir(dev, txbuf, count); 331 if (ret < 0) 332 goto out_kfree; 333 334 kfree(txbuf); 335 kfree(raw); 336 mutex_unlock(&dev->lock); 337 338 /* 339 * The lircd gap calculation expects the write function to 340 * wait for the actual IR signal to be transmitted before 341 * returning. 342 */ 343 towait = ktime_us_delta(ktime_add_us(start, duration), 344 ktime_get()); 345 if (towait > 0) { 346 set_current_state(TASK_INTERRUPTIBLE); 347 schedule_timeout(usecs_to_jiffies(towait)); 348 } 349 350 return n; 351out_kfree: 352 kfree(txbuf); 353out_kfree_raw: 354 kfree(raw); 355out_unlock: 356 mutex_unlock(&dev->lock); 357 return ret; 358} 359 360static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 361{ 362 struct lirc_fh *fh = file->private_data; 363 struct rc_dev *dev = fh->rc; 364 u32 __user *argp = (u32 __user *)(arg); 365 u32 val = 0; 366 int ret; 367 368 if (_IOC_DIR(cmd) & _IOC_WRITE) { 369 ret = get_user(val, argp); 370 if (ret) 371 return ret; 372 } 373 374 ret = mutex_lock_interruptible(&dev->lock); 375 if (ret) 376 return ret; 377 378 if (!dev->registered) { 379 ret = -ENODEV; 380 goto out; 381 } 382 383 switch (cmd) { 384 case LIRC_GET_FEATURES: 385 if (dev->driver_type == RC_DRIVER_SCANCODE) 386 val |= LIRC_CAN_REC_SCANCODE; 387 388 if (dev->driver_type == RC_DRIVER_IR_RAW) { 389 val |= LIRC_CAN_REC_MODE2; 390 if (dev->rx_resolution) 391 val |= LIRC_CAN_GET_REC_RESOLUTION; 392 } 393 394 if (dev->tx_ir) { 395 val |= LIRC_CAN_SEND_PULSE; 396 if (dev->s_tx_mask) 397 val |= LIRC_CAN_SET_TRANSMITTER_MASK; 398 if (dev->s_tx_carrier) 399 val |= LIRC_CAN_SET_SEND_CARRIER; 400 if (dev->s_tx_duty_cycle) 401 val |= LIRC_CAN_SET_SEND_DUTY_CYCLE; 402 } 403 404 if (dev->s_rx_carrier_range) 405 val |= LIRC_CAN_SET_REC_CARRIER | 406 LIRC_CAN_SET_REC_CARRIER_RANGE; 407 408 if (dev->s_wideband_receiver) 409 val |= LIRC_CAN_USE_WIDEBAND_RECEIVER; 410 411 if (dev->s_carrier_report) 412 val |= LIRC_CAN_MEASURE_CARRIER; 413 414 if (dev->max_timeout) 415 val |= LIRC_CAN_SET_REC_TIMEOUT; 416 417 break; 418 419 /* mode support */ 420 case LIRC_GET_REC_MODE: 421 if (dev->driver_type == RC_DRIVER_IR_RAW_TX) 422 ret = -ENOTTY; 423 else 424 val = fh->rec_mode; 425 break; 426 427 case LIRC_SET_REC_MODE: 428 switch (dev->driver_type) { 429 case RC_DRIVER_IR_RAW_TX: 430 ret = -ENOTTY; 431 break; 432 case RC_DRIVER_SCANCODE: 433 if (val != LIRC_MODE_SCANCODE) 434 ret = -EINVAL; 435 break; 436 case RC_DRIVER_IR_RAW: 437 if (!(val == LIRC_MODE_MODE2 || 438 val == LIRC_MODE_SCANCODE)) 439 ret = -EINVAL; 440 break; 441 } 442 443 if (!ret) 444 fh->rec_mode = val; 445 break; 446 447 case LIRC_GET_SEND_MODE: 448 if (!dev->tx_ir) 449 ret = -ENOTTY; 450 else 451 val = fh->send_mode; 452 break; 453 454 case LIRC_SET_SEND_MODE: 455 if (!dev->tx_ir) 456 ret = -ENOTTY; 457 else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE)) 458 ret = -EINVAL; 459 else 460 fh->send_mode = val; 461 break; 462 463 /* TX settings */ 464 case LIRC_SET_TRANSMITTER_MASK: 465 if (!dev->s_tx_mask) 466 ret = -ENOTTY; 467 else 468 ret = dev->s_tx_mask(dev, val); 469 break; 470 471 case LIRC_SET_SEND_CARRIER: 472 if (!dev->s_tx_carrier) 473 ret = -ENOTTY; 474 else 475 ret = dev->s_tx_carrier(dev, val); 476 break; 477 478 case LIRC_SET_SEND_DUTY_CYCLE: 479 if (!dev->s_tx_duty_cycle) 480 ret = -ENOTTY; 481 else if (val <= 0 || val >= 100) 482 ret = -EINVAL; 483 else 484 ret = dev->s_tx_duty_cycle(dev, val); 485 break; 486 487 /* RX settings */ 488 case LIRC_SET_REC_CARRIER: 489 if (!dev->s_rx_carrier_range) 490 ret = -ENOTTY; 491 else if (val <= 0) 492 ret = -EINVAL; 493 else 494 ret = dev->s_rx_carrier_range(dev, fh->carrier_low, 495 val); 496 break; 497 498 case LIRC_SET_REC_CARRIER_RANGE: 499 if (!dev->s_rx_carrier_range) 500 ret = -ENOTTY; 501 else if (val <= 0) 502 ret = -EINVAL; 503 else 504 fh->carrier_low = val; 505 break; 506 507 case LIRC_GET_REC_RESOLUTION: 508 if (!dev->rx_resolution) 509 ret = -ENOTTY; 510 else 511 val = dev->rx_resolution; 512 break; 513 514 case LIRC_SET_WIDEBAND_RECEIVER: 515 if (!dev->s_wideband_receiver) 516 ret = -ENOTTY; 517 else 518 ret = dev->s_wideband_receiver(dev, !!val); 519 break; 520 521 case LIRC_SET_MEASURE_CARRIER_MODE: 522 if (!dev->s_carrier_report) 523 ret = -ENOTTY; 524 else 525 ret = dev->s_carrier_report(dev, !!val); 526 break; 527 528 /* Generic timeout support */ 529 case LIRC_GET_MIN_TIMEOUT: 530 if (!dev->max_timeout) 531 ret = -ENOTTY; 532 else 533 val = dev->min_timeout; 534 break; 535 536 case LIRC_GET_MAX_TIMEOUT: 537 if (!dev->max_timeout) 538 ret = -ENOTTY; 539 else 540 val = dev->max_timeout; 541 break; 542 543 case LIRC_SET_REC_TIMEOUT: 544 if (!dev->max_timeout) { 545 ret = -ENOTTY; 546 } else { 547 if (val < dev->min_timeout || val > dev->max_timeout) 548 ret = -EINVAL; 549 else if (dev->s_timeout) 550 ret = dev->s_timeout(dev, val); 551 else 552 dev->timeout = val; 553 } 554 break; 555 556 case LIRC_GET_REC_TIMEOUT: 557 if (!dev->timeout) 558 ret = -ENOTTY; 559 else 560 val = dev->timeout; 561 break; 562 563 case LIRC_SET_REC_TIMEOUT_REPORTS: 564 if (dev->driver_type != RC_DRIVER_IR_RAW) 565 ret = -ENOTTY; 566 break; 567 568 default: 569 ret = -ENOTTY; 570 } 571 572 if (!ret && _IOC_DIR(cmd) & _IOC_READ) 573 ret = put_user(val, argp); 574 575out: 576 mutex_unlock(&dev->lock); 577 return ret; 578} 579 580static __poll_t lirc_poll(struct file *file, struct poll_table_struct *wait) 581{ 582 struct lirc_fh *fh = file->private_data; 583 struct rc_dev *rcdev = fh->rc; 584 __poll_t events = 0; 585 586 poll_wait(file, &fh->wait_poll, wait); 587 588 if (!rcdev->registered) { 589 events = EPOLLHUP | EPOLLERR; 590 } else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) { 591 if (fh->rec_mode == LIRC_MODE_SCANCODE && 592 !kfifo_is_empty(&fh->scancodes)) 593 events = EPOLLIN | EPOLLRDNORM; 594 595 if (fh->rec_mode == LIRC_MODE_MODE2 && 596 !kfifo_is_empty(&fh->rawir)) 597 events = EPOLLIN | EPOLLRDNORM; 598 } 599 600 return events; 601} 602 603static ssize_t lirc_read_mode2(struct file *file, char __user *buffer, 604 size_t length) 605{ 606 struct lirc_fh *fh = file->private_data; 607 struct rc_dev *rcdev = fh->rc; 608 unsigned int copied; 609 int ret; 610 611 if (length < sizeof(unsigned int) || length % sizeof(unsigned int)) 612 return -EINVAL; 613 614 do { 615 if (kfifo_is_empty(&fh->rawir)) { 616 if (file->f_flags & O_NONBLOCK) 617 return -EAGAIN; 618 619 ret = wait_event_interruptible(fh->wait_poll, 620 !kfifo_is_empty(&fh->rawir) || 621 !rcdev->registered); 622 if (ret) 623 return ret; 624 } 625 626 if (!rcdev->registered) 627 return -ENODEV; 628 629 ret = mutex_lock_interruptible(&rcdev->lock); 630 if (ret) 631 return ret; 632 ret = kfifo_to_user(&fh->rawir, buffer, length, &copied); 633 mutex_unlock(&rcdev->lock); 634 if (ret) 635 return ret; 636 } while (copied == 0); 637 638 return copied; 639} 640 641static ssize_t lirc_read_scancode(struct file *file, char __user *buffer, 642 size_t length) 643{ 644 struct lirc_fh *fh = file->private_data; 645 struct rc_dev *rcdev = fh->rc; 646 unsigned int copied; 647 int ret; 648 649 if (length < sizeof(struct lirc_scancode) || 650 length % sizeof(struct lirc_scancode)) 651 return -EINVAL; 652 653 do { 654 if (kfifo_is_empty(&fh->scancodes)) { 655 if (file->f_flags & O_NONBLOCK) 656 return -EAGAIN; 657 658 ret = wait_event_interruptible(fh->wait_poll, 659 !kfifo_is_empty(&fh->scancodes) || 660 !rcdev->registered); 661 if (ret) 662 return ret; 663 } 664 665 if (!rcdev->registered) 666 return -ENODEV; 667 668 ret = mutex_lock_interruptible(&rcdev->lock); 669 if (ret) 670 return ret; 671 ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied); 672 mutex_unlock(&rcdev->lock); 673 if (ret) 674 return ret; 675 } while (copied == 0); 676 677 return copied; 678} 679 680static ssize_t lirc_read(struct file *file, char __user *buffer, size_t length, 681 loff_t *ppos) 682{ 683 struct lirc_fh *fh = file->private_data; 684 struct rc_dev *rcdev = fh->rc; 685 686 if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX) 687 return -EINVAL; 688 689 if (!rcdev->registered) 690 return -ENODEV; 691 692 if (fh->rec_mode == LIRC_MODE_MODE2) 693 return lirc_read_mode2(file, buffer, length); 694 else /* LIRC_MODE_SCANCODE */ 695 return lirc_read_scancode(file, buffer, length); 696} 697 698static const struct file_operations lirc_fops = { 699 .owner = THIS_MODULE, 700 .write = lirc_transmit, 701 .unlocked_ioctl = lirc_ioctl, 702 .compat_ioctl = compat_ptr_ioctl, 703 .read = lirc_read, 704 .poll = lirc_poll, 705 .open = lirc_open, 706 .release = lirc_close, 707 .llseek = no_llseek, 708}; 709 710static void lirc_release_device(struct device *ld) 711{ 712 struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev); 713 714 put_device(&rcdev->dev); 715} 716 717int lirc_register(struct rc_dev *dev) 718{ 719 const char *rx_type, *tx_type; 720 int err, minor; 721 722 minor = ida_alloc_max(&lirc_ida, RC_DEV_MAX - 1, GFP_KERNEL); 723 if (minor < 0) 724 return minor; 725 726 device_initialize(&dev->lirc_dev); 727 dev->lirc_dev.class = lirc_class; 728 dev->lirc_dev.parent = &dev->dev; 729 dev->lirc_dev.release = lirc_release_device; 730 dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor); 731 dev_set_name(&dev->lirc_dev, "lirc%d", minor); 732 733 INIT_LIST_HEAD(&dev->lirc_fh); 734 spin_lock_init(&dev->lirc_fh_lock); 735 736 cdev_init(&dev->lirc_cdev, &lirc_fops); 737 738 err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev); 739 if (err) 740 goto out_ida; 741 742 get_device(&dev->dev); 743 744 switch (dev->driver_type) { 745 case RC_DRIVER_SCANCODE: 746 rx_type = "scancode"; 747 break; 748 case RC_DRIVER_IR_RAW: 749 rx_type = "raw IR"; 750 break; 751 default: 752 rx_type = "no"; 753 break; 754 } 755 756 if (dev->tx_ir) 757 tx_type = "raw IR"; 758 else 759 tx_type = "no"; 760 761 dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d, %s receiver, %s transmitter", 762 dev->driver_name, minor, rx_type, tx_type); 763 764 return 0; 765 766out_ida: 767 ida_free(&lirc_ida, minor); 768 return err; 769} 770 771void lirc_unregister(struct rc_dev *dev) 772{ 773 unsigned long flags; 774 struct lirc_fh *fh; 775 776 dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n", 777 dev->driver_name, MINOR(dev->lirc_dev.devt)); 778 779 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 780 list_for_each_entry(fh, &dev->lirc_fh, list) 781 wake_up_poll(&fh->wait_poll, EPOLLHUP | EPOLLERR); 782 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 783 784 cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev); 785 ida_free(&lirc_ida, MINOR(dev->lirc_dev.devt)); 786} 787 788int __init lirc_dev_init(void) 789{ 790 int retval; 791 792 lirc_class = class_create("lirc"); 793 if (IS_ERR(lirc_class)) { 794 pr_err("class_create failed\n"); 795 return PTR_ERR(lirc_class); 796 } 797 798 retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc"); 799 if (retval) { 800 class_destroy(lirc_class); 801 pr_err("alloc_chrdev_region failed\n"); 802 return retval; 803 } 804 805 pr_debug("IR Remote Control driver registered, major %d\n", 806 MAJOR(lirc_base_dev)); 807 808 return 0; 809} 810 811void __exit lirc_dev_exit(void) 812{ 813 class_destroy(lirc_class); 814 unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX); 815} 816 817struct rc_dev *rc_dev_get_from_fd(int fd, bool write) 818{ 819 struct fd f = fdget(fd); 820 struct lirc_fh *fh; 821 struct rc_dev *dev; 822 823 if (!f.file) 824 return ERR_PTR(-EBADF); 825 826 if (f.file->f_op != &lirc_fops) { 827 fdput(f); 828 return ERR_PTR(-EINVAL); 829 } 830 831 if (write && !(f.file->f_mode & FMODE_WRITE)) 832 return ERR_PTR(-EPERM); 833 834 fh = f.file->private_data; 835 dev = fh->rc; 836 837 get_device(&dev->dev); 838 fdput(f); 839 840 return dev; 841} 842 843MODULE_ALIAS("lirc_dev"); 844