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 24 static dev_t lirc_base_dev; 25 26 /* Used to keep track of allocated lirc devices */ 27 static DEFINE_IDA(lirc_ida); 28 29 /* Only used for sysfs but defined to void otherwise */ 30 static 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 */ 38 void 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 /* Packet start */ 45 if (ev.reset) { 46 /* 47 * Userspace expects a long space event before the start of 48 * the signal to use as a sync. This may be done with repeat 49 * packets and normal samples. But if a reset has been sent 50 * then we assume that a long time has passed, so we send a 51 * space with the maximum time value. 52 */ 53 sample = LIRC_SPACE(LIRC_VALUE_MASK); 54 dev_dbg(&dev->dev, "delivering reset sync space to lirc_dev\n"); 55 56 /* Carrier reports */ 57 } else if (ev.carrier_report) { 58 sample = LIRC_FREQUENCY(ev.carrier); 59 dev_dbg(&dev->dev, "carrier report (freq: %d)\n", sample); 60 61 /* Packet end */ 62 } else if (ev.timeout) { 63 if (dev->gap) 64 return; 65 66 dev->gap_start = ktime_get(); 67 dev->gap = true; 68 dev->gap_duration = ev.duration; 69 70 sample = LIRC_TIMEOUT(ev.duration); 71 dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample); 72 73 /* Normal sample */ 74 } else { 75 if (dev->gap) { 76 dev->gap_duration += ktime_to_us(ktime_sub(ktime_get(), 77 dev->gap_start)); 78 79 /* Cap by LIRC_VALUE_MASK */ 80 dev->gap_duration = min_t(u64, dev->gap_duration, 81 LIRC_VALUE_MASK); 82 83 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 84 list_for_each_entry(fh, &dev->lirc_fh, list) 85 kfifo_put(&fh->rawir, 86 LIRC_SPACE(dev->gap_duration)); 87 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 88 dev->gap = false; 89 } 90 91 sample = ev.pulse ? LIRC_PULSE(ev.duration) : 92 LIRC_SPACE(ev.duration); 93 dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n", 94 ev.duration, TO_STR(ev.pulse)); 95 } 96 97 /* 98 * bpf does not care about the gap generated above; that exists 99 * for backwards compatibility 100 */ 101 lirc_bpf_run(dev, sample); 102 103 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 104 list_for_each_entry(fh, &dev->lirc_fh, list) { 105 if (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports) 106 continue; 107 if (kfifo_put(&fh->rawir, sample)) 108 wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM); 109 } 110 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 111 } 112 113 /** 114 * lirc_scancode_event() - Send scancode data to lirc to be relayed to 115 * userspace. This can be called in atomic context. 116 * @dev: the struct rc_dev descriptor of the device 117 * @lsc: the struct lirc_scancode describing the decoded scancode 118 */ 119 void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc) 120 { 121 unsigned long flags; 122 struct lirc_fh *fh; 123 124 lsc->timestamp = ktime_get_ns(); 125 126 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 127 list_for_each_entry(fh, &dev->lirc_fh, list) { 128 if (kfifo_put(&fh->scancodes, *lsc)) 129 wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM); 130 } 131 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 132 } 133 EXPORT_SYMBOL_GPL(lirc_scancode_event); 134 135 static int lirc_open(struct inode *inode, struct file *file) 136 { 137 struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev, 138 lirc_cdev); 139 struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL); 140 unsigned long flags; 141 int retval; 142 143 if (!fh) 144 return -ENOMEM; 145 146 get_device(&dev->dev); 147 148 if (!dev->registered) { 149 retval = -ENODEV; 150 goto out_fh; 151 } 152 153 if (dev->driver_type == RC_DRIVER_IR_RAW) { 154 if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) { 155 retval = -ENOMEM; 156 goto out_fh; 157 } 158 } 159 160 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) { 161 if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) { 162 retval = -ENOMEM; 163 goto out_rawir; 164 } 165 } 166 167 fh->send_mode = LIRC_MODE_PULSE; 168 fh->rc = dev; 169 fh->send_timeout_reports = true; 170 171 if (dev->driver_type == RC_DRIVER_SCANCODE) 172 fh->rec_mode = LIRC_MODE_SCANCODE; 173 else 174 fh->rec_mode = LIRC_MODE_MODE2; 175 176 retval = rc_open(dev); 177 if (retval) 178 goto out_kfifo; 179 180 init_waitqueue_head(&fh->wait_poll); 181 182 file->private_data = fh; 183 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 184 list_add(&fh->list, &dev->lirc_fh); 185 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 186 187 stream_open(inode, file); 188 189 return 0; 190 out_kfifo: 191 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) 192 kfifo_free(&fh->scancodes); 193 out_rawir: 194 if (dev->driver_type == RC_DRIVER_IR_RAW) 195 kfifo_free(&fh->rawir); 196 out_fh: 197 kfree(fh); 198 put_device(&dev->dev); 199 200 return retval; 201 } 202 203 static int lirc_close(struct inode *inode, struct file *file) 204 { 205 struct lirc_fh *fh = file->private_data; 206 struct rc_dev *dev = fh->rc; 207 unsigned long flags; 208 209 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 210 list_del(&fh->list); 211 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 212 213 if (dev->driver_type == RC_DRIVER_IR_RAW) 214 kfifo_free(&fh->rawir); 215 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) 216 kfifo_free(&fh->scancodes); 217 kfree(fh); 218 219 rc_close(dev); 220 put_device(&dev->dev); 221 222 return 0; 223 } 224 225 static ssize_t lirc_transmit(struct file *file, const char __user *buf, 226 size_t n, loff_t *ppos) 227 { 228 struct lirc_fh *fh = file->private_data; 229 struct rc_dev *dev = fh->rc; 230 unsigned int *txbuf; 231 struct ir_raw_event *raw = NULL; 232 ssize_t ret; 233 size_t count; 234 ktime_t start; 235 s64 towait; 236 unsigned int duration = 0; /* signal duration in us */ 237 int i; 238 239 ret = mutex_lock_interruptible(&dev->lock); 240 if (ret) 241 return ret; 242 243 if (!dev->registered) { 244 ret = -ENODEV; 245 goto out_unlock; 246 } 247 248 if (!dev->tx_ir) { 249 ret = -EINVAL; 250 goto out_unlock; 251 } 252 253 if (fh->send_mode == LIRC_MODE_SCANCODE) { 254 struct lirc_scancode scan; 255 256 if (n != sizeof(scan)) { 257 ret = -EINVAL; 258 goto out_unlock; 259 } 260 261 if (copy_from_user(&scan, buf, sizeof(scan))) { 262 ret = -EFAULT; 263 goto out_unlock; 264 } 265 266 if (scan.flags || scan.keycode || scan.timestamp) { 267 ret = -EINVAL; 268 goto out_unlock; 269 } 270 271 /* We only have encoders for 32-bit protocols. */ 272 if (scan.scancode > U32_MAX || 273 !rc_validate_scancode(scan.rc_proto, scan.scancode)) { 274 ret = -EINVAL; 275 goto out_unlock; 276 } 277 278 raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL); 279 if (!raw) { 280 ret = -ENOMEM; 281 goto out_unlock; 282 } 283 284 ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode, 285 raw, LIRCBUF_SIZE); 286 if (ret < 0) 287 goto out_kfree_raw; 288 289 count = ret; 290 291 txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL); 292 if (!txbuf) { 293 ret = -ENOMEM; 294 goto out_kfree_raw; 295 } 296 297 for (i = 0; i < count; i++) 298 txbuf[i] = raw[i].duration; 299 300 if (dev->s_tx_carrier) { 301 int carrier = ir_raw_encode_carrier(scan.rc_proto); 302 303 if (carrier > 0) 304 dev->s_tx_carrier(dev, carrier); 305 } 306 } else { 307 if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) { 308 ret = -EINVAL; 309 goto out_unlock; 310 } 311 312 count = n / sizeof(unsigned int); 313 if (count > LIRCBUF_SIZE || count % 2 == 0) { 314 ret = -EINVAL; 315 goto out_unlock; 316 } 317 318 txbuf = memdup_user(buf, n); 319 if (IS_ERR(txbuf)) { 320 ret = PTR_ERR(txbuf); 321 goto out_unlock; 322 } 323 } 324 325 for (i = 0; i < count; i++) { 326 if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) { 327 ret = -EINVAL; 328 goto out_kfree; 329 } 330 331 duration += txbuf[i]; 332 } 333 334 start = ktime_get(); 335 336 ret = dev->tx_ir(dev, txbuf, count); 337 if (ret < 0) 338 goto out_kfree; 339 340 kfree(txbuf); 341 kfree(raw); 342 mutex_unlock(&dev->lock); 343 344 /* 345 * The lircd gap calculation expects the write function to 346 * wait for the actual IR signal to be transmitted before 347 * returning. 348 */ 349 towait = ktime_us_delta(ktime_add_us(start, duration), 350 ktime_get()); 351 if (towait > 0) { 352 set_current_state(TASK_INTERRUPTIBLE); 353 schedule_timeout(usecs_to_jiffies(towait)); 354 } 355 356 return n; 357 out_kfree: 358 kfree(txbuf); 359 out_kfree_raw: 360 kfree(raw); 361 out_unlock: 362 mutex_unlock(&dev->lock); 363 return ret; 364 } 365 366 static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 367 { 368 struct lirc_fh *fh = file->private_data; 369 struct rc_dev *dev = fh->rc; 370 u32 __user *argp = (u32 __user *)(arg); 371 u32 val = 0; 372 int ret; 373 374 if (_IOC_DIR(cmd) & _IOC_WRITE) { 375 ret = get_user(val, argp); 376 if (ret) 377 return ret; 378 } 379 380 ret = mutex_lock_interruptible(&dev->lock); 381 if (ret) 382 return ret; 383 384 if (!dev->registered) { 385 ret = -ENODEV; 386 goto out; 387 } 388 389 switch (cmd) { 390 case LIRC_GET_FEATURES: 391 if (dev->driver_type == RC_DRIVER_SCANCODE) 392 val |= LIRC_CAN_REC_SCANCODE; 393 394 if (dev->driver_type == RC_DRIVER_IR_RAW) { 395 val |= LIRC_CAN_REC_MODE2; 396 if (dev->rx_resolution) 397 val |= LIRC_CAN_GET_REC_RESOLUTION; 398 } 399 400 if (dev->tx_ir) { 401 val |= LIRC_CAN_SEND_PULSE; 402 if (dev->s_tx_mask) 403 val |= LIRC_CAN_SET_TRANSMITTER_MASK; 404 if (dev->s_tx_carrier) 405 val |= LIRC_CAN_SET_SEND_CARRIER; 406 if (dev->s_tx_duty_cycle) 407 val |= LIRC_CAN_SET_SEND_DUTY_CYCLE; 408 } 409 410 if (dev->s_rx_carrier_range) 411 val |= LIRC_CAN_SET_REC_CARRIER | 412 LIRC_CAN_SET_REC_CARRIER_RANGE; 413 414 if (dev->s_learning_mode) 415 val |= LIRC_CAN_USE_WIDEBAND_RECEIVER; 416 417 if (dev->s_carrier_report) 418 val |= LIRC_CAN_MEASURE_CARRIER; 419 420 if (dev->max_timeout) 421 val |= LIRC_CAN_SET_REC_TIMEOUT; 422 423 break; 424 425 /* mode support */ 426 case LIRC_GET_REC_MODE: 427 if (dev->driver_type == RC_DRIVER_IR_RAW_TX) 428 ret = -ENOTTY; 429 else 430 val = fh->rec_mode; 431 break; 432 433 case LIRC_SET_REC_MODE: 434 switch (dev->driver_type) { 435 case RC_DRIVER_IR_RAW_TX: 436 ret = -ENOTTY; 437 break; 438 case RC_DRIVER_SCANCODE: 439 if (val != LIRC_MODE_SCANCODE) 440 ret = -EINVAL; 441 break; 442 case RC_DRIVER_IR_RAW: 443 if (!(val == LIRC_MODE_MODE2 || 444 val == LIRC_MODE_SCANCODE)) 445 ret = -EINVAL; 446 break; 447 } 448 449 if (!ret) 450 fh->rec_mode = val; 451 break; 452 453 case LIRC_GET_SEND_MODE: 454 if (!dev->tx_ir) 455 ret = -ENOTTY; 456 else 457 val = fh->send_mode; 458 break; 459 460 case LIRC_SET_SEND_MODE: 461 if (!dev->tx_ir) 462 ret = -ENOTTY; 463 else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE)) 464 ret = -EINVAL; 465 else 466 fh->send_mode = val; 467 break; 468 469 /* TX settings */ 470 case LIRC_SET_TRANSMITTER_MASK: 471 if (!dev->s_tx_mask) 472 ret = -ENOTTY; 473 else 474 ret = dev->s_tx_mask(dev, val); 475 break; 476 477 case LIRC_SET_SEND_CARRIER: 478 if (!dev->s_tx_carrier) 479 ret = -ENOTTY; 480 else 481 ret = dev->s_tx_carrier(dev, val); 482 break; 483 484 case LIRC_SET_SEND_DUTY_CYCLE: 485 if (!dev->s_tx_duty_cycle) 486 ret = -ENOTTY; 487 else if (val <= 0 || val >= 100) 488 ret = -EINVAL; 489 else 490 ret = dev->s_tx_duty_cycle(dev, val); 491 break; 492 493 /* RX settings */ 494 case LIRC_SET_REC_CARRIER: 495 if (!dev->s_rx_carrier_range) 496 ret = -ENOTTY; 497 else if (val <= 0) 498 ret = -EINVAL; 499 else 500 ret = dev->s_rx_carrier_range(dev, fh->carrier_low, 501 val); 502 break; 503 504 case LIRC_SET_REC_CARRIER_RANGE: 505 if (!dev->s_rx_carrier_range) 506 ret = -ENOTTY; 507 else if (val <= 0) 508 ret = -EINVAL; 509 else 510 fh->carrier_low = val; 511 break; 512 513 case LIRC_GET_REC_RESOLUTION: 514 if (!dev->rx_resolution) 515 ret = -ENOTTY; 516 else 517 val = dev->rx_resolution; 518 break; 519 520 case LIRC_SET_WIDEBAND_RECEIVER: 521 if (!dev->s_learning_mode) 522 ret = -ENOTTY; 523 else 524 ret = dev->s_learning_mode(dev, !!val); 525 break; 526 527 case LIRC_SET_MEASURE_CARRIER_MODE: 528 if (!dev->s_carrier_report) 529 ret = -ENOTTY; 530 else 531 ret = dev->s_carrier_report(dev, !!val); 532 break; 533 534 /* Generic timeout support */ 535 case LIRC_GET_MIN_TIMEOUT: 536 if (!dev->max_timeout) 537 ret = -ENOTTY; 538 else 539 val = dev->min_timeout; 540 break; 541 542 case LIRC_GET_MAX_TIMEOUT: 543 if (!dev->max_timeout) 544 ret = -ENOTTY; 545 else 546 val = dev->max_timeout; 547 break; 548 549 case LIRC_SET_REC_TIMEOUT: 550 if (!dev->max_timeout) { 551 ret = -ENOTTY; 552 } else { 553 if (val < dev->min_timeout || val > dev->max_timeout) 554 ret = -EINVAL; 555 else if (dev->s_timeout) 556 ret = dev->s_timeout(dev, val); 557 else 558 dev->timeout = val; 559 } 560 break; 561 562 case LIRC_GET_REC_TIMEOUT: 563 if (!dev->timeout) 564 ret = -ENOTTY; 565 else 566 val = dev->timeout; 567 break; 568 569 case LIRC_SET_REC_TIMEOUT_REPORTS: 570 if (dev->driver_type != RC_DRIVER_IR_RAW) 571 ret = -ENOTTY; 572 else 573 fh->send_timeout_reports = !!val; 574 break; 575 576 default: 577 ret = -ENOTTY; 578 } 579 580 if (!ret && _IOC_DIR(cmd) & _IOC_READ) 581 ret = put_user(val, argp); 582 583 out: 584 mutex_unlock(&dev->lock); 585 return ret; 586 } 587 588 static __poll_t lirc_poll(struct file *file, struct poll_table_struct *wait) 589 { 590 struct lirc_fh *fh = file->private_data; 591 struct rc_dev *rcdev = fh->rc; 592 __poll_t events = 0; 593 594 poll_wait(file, &fh->wait_poll, wait); 595 596 if (!rcdev->registered) { 597 events = EPOLLHUP | EPOLLERR; 598 } else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) { 599 if (fh->rec_mode == LIRC_MODE_SCANCODE && 600 !kfifo_is_empty(&fh->scancodes)) 601 events = EPOLLIN | EPOLLRDNORM; 602 603 if (fh->rec_mode == LIRC_MODE_MODE2 && 604 !kfifo_is_empty(&fh->rawir)) 605 events = EPOLLIN | EPOLLRDNORM; 606 } 607 608 return events; 609 } 610 611 static ssize_t lirc_read_mode2(struct file *file, char __user *buffer, 612 size_t length) 613 { 614 struct lirc_fh *fh = file->private_data; 615 struct rc_dev *rcdev = fh->rc; 616 unsigned int copied; 617 int ret; 618 619 if (length < sizeof(unsigned int) || length % sizeof(unsigned int)) 620 return -EINVAL; 621 622 do { 623 if (kfifo_is_empty(&fh->rawir)) { 624 if (file->f_flags & O_NONBLOCK) 625 return -EAGAIN; 626 627 ret = wait_event_interruptible(fh->wait_poll, 628 !kfifo_is_empty(&fh->rawir) || 629 !rcdev->registered); 630 if (ret) 631 return ret; 632 } 633 634 if (!rcdev->registered) 635 return -ENODEV; 636 637 ret = mutex_lock_interruptible(&rcdev->lock); 638 if (ret) 639 return ret; 640 ret = kfifo_to_user(&fh->rawir, buffer, length, &copied); 641 mutex_unlock(&rcdev->lock); 642 if (ret) 643 return ret; 644 } while (copied == 0); 645 646 return copied; 647 } 648 649 static ssize_t lirc_read_scancode(struct file *file, char __user *buffer, 650 size_t length) 651 { 652 struct lirc_fh *fh = file->private_data; 653 struct rc_dev *rcdev = fh->rc; 654 unsigned int copied; 655 int ret; 656 657 if (length < sizeof(struct lirc_scancode) || 658 length % sizeof(struct lirc_scancode)) 659 return -EINVAL; 660 661 do { 662 if (kfifo_is_empty(&fh->scancodes)) { 663 if (file->f_flags & O_NONBLOCK) 664 return -EAGAIN; 665 666 ret = wait_event_interruptible(fh->wait_poll, 667 !kfifo_is_empty(&fh->scancodes) || 668 !rcdev->registered); 669 if (ret) 670 return ret; 671 } 672 673 if (!rcdev->registered) 674 return -ENODEV; 675 676 ret = mutex_lock_interruptible(&rcdev->lock); 677 if (ret) 678 return ret; 679 ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied); 680 mutex_unlock(&rcdev->lock); 681 if (ret) 682 return ret; 683 } while (copied == 0); 684 685 return copied; 686 } 687 688 static ssize_t lirc_read(struct file *file, char __user *buffer, size_t length, 689 loff_t *ppos) 690 { 691 struct lirc_fh *fh = file->private_data; 692 struct rc_dev *rcdev = fh->rc; 693 694 if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX) 695 return -EINVAL; 696 697 if (!rcdev->registered) 698 return -ENODEV; 699 700 if (fh->rec_mode == LIRC_MODE_MODE2) 701 return lirc_read_mode2(file, buffer, length); 702 else /* LIRC_MODE_SCANCODE */ 703 return lirc_read_scancode(file, buffer, length); 704 } 705 706 static const struct file_operations lirc_fops = { 707 .owner = THIS_MODULE, 708 .write = lirc_transmit, 709 .unlocked_ioctl = lirc_ioctl, 710 .compat_ioctl = compat_ptr_ioctl, 711 .read = lirc_read, 712 .poll = lirc_poll, 713 .open = lirc_open, 714 .release = lirc_close, 715 .llseek = no_llseek, 716 }; 717 718 static void lirc_release_device(struct device *ld) 719 { 720 struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev); 721 722 put_device(&rcdev->dev); 723 } 724 725 int lirc_register(struct rc_dev *dev) 726 { 727 const char *rx_type, *tx_type; 728 int err, minor; 729 730 minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL); 731 if (minor < 0) 732 return minor; 733 734 device_initialize(&dev->lirc_dev); 735 dev->lirc_dev.class = lirc_class; 736 dev->lirc_dev.parent = &dev->dev; 737 dev->lirc_dev.release = lirc_release_device; 738 dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor); 739 dev_set_name(&dev->lirc_dev, "lirc%d", minor); 740 741 INIT_LIST_HEAD(&dev->lirc_fh); 742 spin_lock_init(&dev->lirc_fh_lock); 743 744 cdev_init(&dev->lirc_cdev, &lirc_fops); 745 746 err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev); 747 if (err) 748 goto out_ida; 749 750 get_device(&dev->dev); 751 752 switch (dev->driver_type) { 753 case RC_DRIVER_SCANCODE: 754 rx_type = "scancode"; 755 break; 756 case RC_DRIVER_IR_RAW: 757 rx_type = "raw IR"; 758 break; 759 default: 760 rx_type = "no"; 761 break; 762 } 763 764 if (dev->tx_ir) 765 tx_type = "raw IR"; 766 else 767 tx_type = "no"; 768 769 dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d, %s receiver, %s transmitter", 770 dev->driver_name, minor, rx_type, tx_type); 771 772 return 0; 773 774 out_ida: 775 ida_simple_remove(&lirc_ida, minor); 776 return err; 777 } 778 779 void lirc_unregister(struct rc_dev *dev) 780 { 781 unsigned long flags; 782 struct lirc_fh *fh; 783 784 dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n", 785 dev->driver_name, MINOR(dev->lirc_dev.devt)); 786 787 spin_lock_irqsave(&dev->lirc_fh_lock, flags); 788 list_for_each_entry(fh, &dev->lirc_fh, list) 789 wake_up_poll(&fh->wait_poll, EPOLLHUP | EPOLLERR); 790 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 791 792 cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev); 793 ida_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt)); 794 } 795 796 int __init lirc_dev_init(void) 797 { 798 int retval; 799 800 lirc_class = class_create(THIS_MODULE, "lirc"); 801 if (IS_ERR(lirc_class)) { 802 pr_err("class_create failed\n"); 803 return PTR_ERR(lirc_class); 804 } 805 806 retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc"); 807 if (retval) { 808 class_destroy(lirc_class); 809 pr_err("alloc_chrdev_region failed\n"); 810 return retval; 811 } 812 813 pr_debug("IR Remote Control driver registered, major %d\n", 814 MAJOR(lirc_base_dev)); 815 816 return 0; 817 } 818 819 void __exit lirc_dev_exit(void) 820 { 821 class_destroy(lirc_class); 822 unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX); 823 } 824 825 struct rc_dev *rc_dev_get_from_fd(int fd) 826 { 827 struct fd f = fdget(fd); 828 struct lirc_fh *fh; 829 struct rc_dev *dev; 830 831 if (!f.file) 832 return ERR_PTR(-EBADF); 833 834 if (f.file->f_op != &lirc_fops) { 835 fdput(f); 836 return ERR_PTR(-EINVAL); 837 } 838 839 fh = f.file->private_data; 840 dev = fh->rc; 841 842 get_device(&dev->dev); 843 fdput(f); 844 845 return dev; 846 } 847 848 MODULE_ALIAS("lirc_dev"); 849