1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/char/ppdev.c 4 * 5 * This is the code behind /dev/parport* -- it allows a user-space 6 * application to use the parport subsystem. 7 * 8 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> 9 * 10 * A /dev/parportx device node represents an arbitrary device 11 * on port 'x'. The following operations are possible: 12 * 13 * open do nothing, set up default IEEE 1284 protocol to be COMPAT 14 * close release port and unregister device (if necessary) 15 * ioctl 16 * EXCL register device exclusively (may fail) 17 * CLAIM (register device first time) parport_claim_or_block 18 * RELEASE parport_release 19 * SETMODE set the IEEE 1284 protocol to use for read/write 20 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be 21 * confused with ioctl(fd, SETPHASER, &stun). ;-) 22 * DATADIR data_forward / data_reverse 23 * WDATA write_data 24 * RDATA read_data 25 * WCONTROL write_control 26 * RCONTROL read_control 27 * FCONTROL frob_control 28 * RSTATUS read_status 29 * NEGOT parport_negotiate 30 * YIELD parport_yield_blocking 31 * WCTLONIRQ on interrupt, set control lines 32 * CLRIRQ clear (and return) interrupt count 33 * SETTIME sets device timeout (struct timeval) 34 * GETTIME gets device timeout (struct timeval) 35 * GETMODES gets hardware supported modes (unsigned int) 36 * GETMODE gets the current IEEE1284 mode 37 * GETPHASE gets the current IEEE1284 phase 38 * GETFLAGS gets current (user-visible) flags 39 * SETFLAGS sets current (user-visible) flags 40 * read/write read or write in current IEEE 1284 protocol 41 * select wait for interrupt (in readfds) 42 * 43 * Changes: 44 * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. 45 * 46 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 47 * - On error, copy_from_user and copy_to_user do not return -EFAULT, 48 * They return the positive number of bytes *not* copied due to address 49 * space errors. 50 * 51 * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. 52 * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 53 */ 54 55 #include <linux/module.h> 56 #include <linux/init.h> 57 #include <linux/sched/signal.h> 58 #include <linux/device.h> 59 #include <linux/ioctl.h> 60 #include <linux/parport.h> 61 #include <linux/ctype.h> 62 #include <linux/poll.h> 63 #include <linux/slab.h> 64 #include <linux/major.h> 65 #include <linux/ppdev.h> 66 #include <linux/mutex.h> 67 #include <linux/uaccess.h> 68 #include <linux/compat.h> 69 70 #define PP_VERSION "ppdev: user-space parallel port driver" 71 #define CHRDEV "ppdev" 72 73 struct pp_struct { 74 struct pardevice *pdev; 75 wait_queue_head_t irq_wait; 76 atomic_t irqc; 77 unsigned int flags; 78 int irqresponse; 79 unsigned char irqctl; 80 struct ieee1284_info state; 81 struct ieee1284_info saved_state; 82 long default_inactivity; 83 int index; 84 }; 85 86 /* should we use PARDEVICE_MAX here? */ 87 static struct device *devices[PARPORT_MAX]; 88 89 static DEFINE_IDA(ida_index); 90 91 /* pp_struct.flags bitfields */ 92 #define PP_CLAIMED (1<<0) 93 #define PP_EXCL (1<<1) 94 95 /* Other constants */ 96 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 97 #define PP_BUFFER_SIZE 1024 98 #define PARDEVICE_MAX 8 99 100 static DEFINE_MUTEX(pp_do_mutex); 101 102 /* define fixed sized ioctl cmd for y2038 migration */ 103 #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) 104 #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) 105 #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) 106 #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) 107 108 static inline void pp_enable_irq(struct pp_struct *pp) 109 { 110 struct parport *port = pp->pdev->port; 111 112 port->ops->enable_irq(port); 113 } 114 115 static ssize_t pp_read(struct file *file, char __user *buf, size_t count, 116 loff_t *ppos) 117 { 118 unsigned int minor = iminor(file_inode(file)); 119 struct pp_struct *pp = file->private_data; 120 char *kbuffer; 121 ssize_t bytes_read = 0; 122 struct parport *pport; 123 int mode; 124 125 if (!(pp->flags & PP_CLAIMED)) { 126 /* Don't have the port claimed */ 127 pr_debug(CHRDEV "%x: claim the port first\n", minor); 128 return -EINVAL; 129 } 130 131 /* Trivial case. */ 132 if (count == 0) 133 return 0; 134 135 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 136 if (!kbuffer) 137 return -ENOMEM; 138 pport = pp->pdev->port; 139 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 140 141 parport_set_timeout(pp->pdev, 142 (file->f_flags & O_NONBLOCK) ? 143 PARPORT_INACTIVITY_O_NONBLOCK : 144 pp->default_inactivity); 145 146 while (bytes_read == 0) { 147 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 148 149 if (mode == IEEE1284_MODE_EPP) { 150 /* various specials for EPP mode */ 151 int flags = 0; 152 size_t (*fn)(struct parport *, void *, size_t, int); 153 154 if (pp->flags & PP_W91284PIC) 155 flags |= PARPORT_W91284PIC; 156 if (pp->flags & PP_FASTREAD) 157 flags |= PARPORT_EPP_FAST; 158 if (pport->ieee1284.mode & IEEE1284_ADDR) 159 fn = pport->ops->epp_read_addr; 160 else 161 fn = pport->ops->epp_read_data; 162 bytes_read = (*fn)(pport, kbuffer, need, flags); 163 } else { 164 bytes_read = parport_read(pport, kbuffer, need); 165 } 166 167 if (bytes_read != 0) 168 break; 169 170 if (file->f_flags & O_NONBLOCK) { 171 bytes_read = -EAGAIN; 172 break; 173 } 174 175 if (signal_pending(current)) { 176 bytes_read = -ERESTARTSYS; 177 break; 178 } 179 180 cond_resched(); 181 } 182 183 parport_set_timeout(pp->pdev, pp->default_inactivity); 184 185 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) 186 bytes_read = -EFAULT; 187 188 kfree(kbuffer); 189 pp_enable_irq(pp); 190 return bytes_read; 191 } 192 193 static ssize_t pp_write(struct file *file, const char __user *buf, 194 size_t count, loff_t *ppos) 195 { 196 unsigned int minor = iminor(file_inode(file)); 197 struct pp_struct *pp = file->private_data; 198 char *kbuffer; 199 ssize_t bytes_written = 0; 200 ssize_t wrote; 201 int mode; 202 struct parport *pport; 203 204 if (!(pp->flags & PP_CLAIMED)) { 205 /* Don't have the port claimed */ 206 pr_debug(CHRDEV "%x: claim the port first\n", minor); 207 return -EINVAL; 208 } 209 210 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 211 if (!kbuffer) 212 return -ENOMEM; 213 214 pport = pp->pdev->port; 215 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 216 217 parport_set_timeout(pp->pdev, 218 (file->f_flags & O_NONBLOCK) ? 219 PARPORT_INACTIVITY_O_NONBLOCK : 220 pp->default_inactivity); 221 222 while (bytes_written < count) { 223 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 224 225 if (copy_from_user(kbuffer, buf + bytes_written, n)) { 226 bytes_written = -EFAULT; 227 break; 228 } 229 230 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 231 /* do a fast EPP write */ 232 if (pport->ieee1284.mode & IEEE1284_ADDR) { 233 wrote = pport->ops->epp_write_addr(pport, 234 kbuffer, n, PARPORT_EPP_FAST); 235 } else { 236 wrote = pport->ops->epp_write_data(pport, 237 kbuffer, n, PARPORT_EPP_FAST); 238 } 239 } else { 240 wrote = parport_write(pp->pdev->port, kbuffer, n); 241 } 242 243 if (wrote <= 0) { 244 if (!bytes_written) 245 bytes_written = wrote; 246 break; 247 } 248 249 bytes_written += wrote; 250 251 if (file->f_flags & O_NONBLOCK) { 252 if (!bytes_written) 253 bytes_written = -EAGAIN; 254 break; 255 } 256 257 if (signal_pending(current)) 258 break; 259 260 cond_resched(); 261 } 262 263 parport_set_timeout(pp->pdev, pp->default_inactivity); 264 265 kfree(kbuffer); 266 pp_enable_irq(pp); 267 return bytes_written; 268 } 269 270 static void pp_irq(void *private) 271 { 272 struct pp_struct *pp = private; 273 274 if (pp->irqresponse) { 275 parport_write_control(pp->pdev->port, pp->irqctl); 276 pp->irqresponse = 0; 277 } 278 279 atomic_inc(&pp->irqc); 280 wake_up_interruptible(&pp->irq_wait); 281 } 282 283 static int register_device(int minor, struct pp_struct *pp) 284 { 285 struct parport *port; 286 struct pardevice *pdev = NULL; 287 char *name; 288 struct pardev_cb ppdev_cb; 289 int rc = 0, index; 290 291 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 292 if (name == NULL) 293 return -ENOMEM; 294 295 port = parport_find_number(minor); 296 if (!port) { 297 pr_warn("%s: no associated port!\n", name); 298 rc = -ENXIO; 299 goto err; 300 } 301 302 index = ida_alloc(&ida_index, GFP_KERNEL); 303 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 304 ppdev_cb.irq_func = pp_irq; 305 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 306 ppdev_cb.private = pp; 307 pdev = parport_register_dev_model(port, name, &ppdev_cb, index); 308 parport_put_port(port); 309 310 if (!pdev) { 311 pr_warn("%s: failed to register device!\n", name); 312 rc = -ENXIO; 313 ida_free(&ida_index, index); 314 goto err; 315 } 316 317 pp->pdev = pdev; 318 pp->index = index; 319 dev_dbg(&pdev->dev, "registered pardevice\n"); 320 err: 321 kfree(name); 322 return rc; 323 } 324 325 static enum ieee1284_phase init_phase(int mode) 326 { 327 switch (mode & ~(IEEE1284_DEVICEID 328 | IEEE1284_ADDR)) { 329 case IEEE1284_MODE_NIBBLE: 330 case IEEE1284_MODE_BYTE: 331 return IEEE1284_PH_REV_IDLE; 332 } 333 return IEEE1284_PH_FWD_IDLE; 334 } 335 336 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 337 { 338 long to_jiffies; 339 340 if ((tv_sec < 0) || (tv_usec < 0)) 341 return -EINVAL; 342 343 to_jiffies = usecs_to_jiffies(tv_usec); 344 to_jiffies += tv_sec * HZ; 345 if (to_jiffies <= 0) 346 return -EINVAL; 347 348 pdev->timeout = to_jiffies; 349 return 0; 350 } 351 352 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 353 { 354 unsigned int minor = iminor(file_inode(file)); 355 struct pp_struct *pp = file->private_data; 356 struct parport *port; 357 void __user *argp = (void __user *)arg; 358 struct ieee1284_info *info; 359 unsigned char reg; 360 unsigned char mask; 361 int mode; 362 s32 time32[2]; 363 s64 time64[2]; 364 struct timespec64 ts; 365 int ret; 366 367 /* First handle the cases that don't take arguments. */ 368 switch (cmd) { 369 case PPCLAIM: 370 { 371 if (pp->flags & PP_CLAIMED) { 372 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 373 return -EINVAL; 374 } 375 376 /* Deferred device registration. */ 377 if (!pp->pdev) { 378 int err = register_device(minor, pp); 379 380 if (err) 381 return err; 382 } 383 384 ret = parport_claim_or_block(pp->pdev); 385 if (ret < 0) 386 return ret; 387 388 pp->flags |= PP_CLAIMED; 389 390 /* For interrupt-reporting to work, we need to be 391 * informed of each interrupt. */ 392 pp_enable_irq(pp); 393 394 /* We may need to fix up the state machine. */ 395 info = &pp->pdev->port->ieee1284; 396 pp->saved_state.mode = info->mode; 397 pp->saved_state.phase = info->phase; 398 info->mode = pp->state.mode; 399 info->phase = pp->state.phase; 400 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 401 parport_set_timeout(pp->pdev, pp->default_inactivity); 402 403 return 0; 404 } 405 case PPEXCL: 406 if (pp->pdev) { 407 dev_dbg(&pp->pdev->dev, 408 "too late for PPEXCL; already registered\n"); 409 if (pp->flags & PP_EXCL) 410 /* But it's not really an error. */ 411 return 0; 412 /* There's no chance of making the driver happy. */ 413 return -EINVAL; 414 } 415 416 /* Just remember to register the device exclusively 417 * when we finally do the registration. */ 418 pp->flags |= PP_EXCL; 419 return 0; 420 case PPSETMODE: 421 { 422 int mode; 423 424 if (copy_from_user(&mode, argp, sizeof(mode))) 425 return -EFAULT; 426 /* FIXME: validate mode */ 427 pp->state.mode = mode; 428 pp->state.phase = init_phase(mode); 429 430 if (pp->flags & PP_CLAIMED) { 431 pp->pdev->port->ieee1284.mode = mode; 432 pp->pdev->port->ieee1284.phase = pp->state.phase; 433 } 434 435 return 0; 436 } 437 case PPGETMODE: 438 { 439 int mode; 440 441 if (pp->flags & PP_CLAIMED) 442 mode = pp->pdev->port->ieee1284.mode; 443 else 444 mode = pp->state.mode; 445 446 if (copy_to_user(argp, &mode, sizeof(mode))) 447 return -EFAULT; 448 return 0; 449 } 450 case PPSETPHASE: 451 { 452 int phase; 453 454 if (copy_from_user(&phase, argp, sizeof(phase))) 455 return -EFAULT; 456 457 /* FIXME: validate phase */ 458 pp->state.phase = phase; 459 460 if (pp->flags & PP_CLAIMED) 461 pp->pdev->port->ieee1284.phase = phase; 462 463 return 0; 464 } 465 case PPGETPHASE: 466 { 467 int phase; 468 469 if (pp->flags & PP_CLAIMED) 470 phase = pp->pdev->port->ieee1284.phase; 471 else 472 phase = pp->state.phase; 473 if (copy_to_user(argp, &phase, sizeof(phase))) 474 return -EFAULT; 475 return 0; 476 } 477 case PPGETMODES: 478 { 479 unsigned int modes; 480 481 port = parport_find_number(minor); 482 if (!port) 483 return -ENODEV; 484 485 modes = port->modes; 486 parport_put_port(port); 487 if (copy_to_user(argp, &modes, sizeof(modes))) 488 return -EFAULT; 489 return 0; 490 } 491 case PPSETFLAGS: 492 { 493 int uflags; 494 495 if (copy_from_user(&uflags, argp, sizeof(uflags))) 496 return -EFAULT; 497 pp->flags &= ~PP_FLAGMASK; 498 pp->flags |= (uflags & PP_FLAGMASK); 499 return 0; 500 } 501 case PPGETFLAGS: 502 { 503 int uflags; 504 505 uflags = pp->flags & PP_FLAGMASK; 506 if (copy_to_user(argp, &uflags, sizeof(uflags))) 507 return -EFAULT; 508 return 0; 509 } 510 } /* end switch() */ 511 512 /* Everything else requires the port to be claimed, so check 513 * that now. */ 514 if ((pp->flags & PP_CLAIMED) == 0) { 515 pr_debug(CHRDEV "%x: claim the port first\n", minor); 516 return -EINVAL; 517 } 518 519 port = pp->pdev->port; 520 switch (cmd) { 521 case PPRSTATUS: 522 reg = parport_read_status(port); 523 if (copy_to_user(argp, ®, sizeof(reg))) 524 return -EFAULT; 525 return 0; 526 case PPRDATA: 527 reg = parport_read_data(port); 528 if (copy_to_user(argp, ®, sizeof(reg))) 529 return -EFAULT; 530 return 0; 531 case PPRCONTROL: 532 reg = parport_read_control(port); 533 if (copy_to_user(argp, ®, sizeof(reg))) 534 return -EFAULT; 535 return 0; 536 case PPYIELD: 537 parport_yield_blocking(pp->pdev); 538 return 0; 539 540 case PPRELEASE: 541 /* Save the state machine's state. */ 542 info = &pp->pdev->port->ieee1284; 543 pp->state.mode = info->mode; 544 pp->state.phase = info->phase; 545 info->mode = pp->saved_state.mode; 546 info->phase = pp->saved_state.phase; 547 parport_release(pp->pdev); 548 pp->flags &= ~PP_CLAIMED; 549 return 0; 550 551 case PPWCONTROL: 552 if (copy_from_user(®, argp, sizeof(reg))) 553 return -EFAULT; 554 parport_write_control(port, reg); 555 return 0; 556 557 case PPWDATA: 558 if (copy_from_user(®, argp, sizeof(reg))) 559 return -EFAULT; 560 parport_write_data(port, reg); 561 return 0; 562 563 case PPFCONTROL: 564 if (copy_from_user(&mask, argp, 565 sizeof(mask))) 566 return -EFAULT; 567 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 568 sizeof(reg))) 569 return -EFAULT; 570 parport_frob_control(port, mask, reg); 571 return 0; 572 573 case PPDATADIR: 574 if (copy_from_user(&mode, argp, sizeof(mode))) 575 return -EFAULT; 576 if (mode) 577 port->ops->data_reverse(port); 578 else 579 port->ops->data_forward(port); 580 return 0; 581 582 case PPNEGOT: 583 if (copy_from_user(&mode, argp, sizeof(mode))) 584 return -EFAULT; 585 switch ((ret = parport_negotiate(port, mode))) { 586 case 0: break; 587 case -1: /* handshake failed, peripheral not IEEE 1284 */ 588 ret = -EIO; 589 break; 590 case 1: /* handshake succeeded, peripheral rejected mode */ 591 ret = -ENXIO; 592 break; 593 } 594 pp_enable_irq(pp); 595 return ret; 596 597 case PPWCTLONIRQ: 598 if (copy_from_user(®, argp, sizeof(reg))) 599 return -EFAULT; 600 601 /* Remember what to set the control lines to, for next 602 * time we get an interrupt. */ 603 pp->irqctl = reg; 604 pp->irqresponse = 1; 605 return 0; 606 607 case PPCLRIRQ: 608 ret = atomic_read(&pp->irqc); 609 if (copy_to_user(argp, &ret, sizeof(ret))) 610 return -EFAULT; 611 atomic_sub(ret, &pp->irqc); 612 return 0; 613 614 case PPSETTIME32: 615 if (copy_from_user(time32, argp, sizeof(time32))) 616 return -EFAULT; 617 618 if ((time32[0] < 0) || (time32[1] < 0)) 619 return -EINVAL; 620 621 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 622 623 case PPSETTIME64: 624 if (copy_from_user(time64, argp, sizeof(time64))) 625 return -EFAULT; 626 627 if ((time64[0] < 0) || (time64[1] < 0)) 628 return -EINVAL; 629 630 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) 631 time64[1] >>= 32; 632 633 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 634 635 case PPGETTIME32: 636 jiffies_to_timespec64(pp->pdev->timeout, &ts); 637 time32[0] = ts.tv_sec; 638 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 639 640 if (copy_to_user(argp, time32, sizeof(time32))) 641 return -EFAULT; 642 643 return 0; 644 645 case PPGETTIME64: 646 jiffies_to_timespec64(pp->pdev->timeout, &ts); 647 time64[0] = ts.tv_sec; 648 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 649 650 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) 651 time64[1] <<= 32; 652 653 if (copy_to_user(argp, time64, sizeof(time64))) 654 return -EFAULT; 655 656 return 0; 657 658 default: 659 dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd); 660 return -EINVAL; 661 } 662 663 /* Keep the compiler happy */ 664 return 0; 665 } 666 667 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 668 { 669 long ret; 670 671 mutex_lock(&pp_do_mutex); 672 ret = pp_do_ioctl(file, cmd, arg); 673 mutex_unlock(&pp_do_mutex); 674 return ret; 675 } 676 677 static int pp_open(struct inode *inode, struct file *file) 678 { 679 unsigned int minor = iminor(inode); 680 struct pp_struct *pp; 681 682 if (minor >= PARPORT_MAX) 683 return -ENXIO; 684 685 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 686 if (!pp) 687 return -ENOMEM; 688 689 pp->state.mode = IEEE1284_MODE_COMPAT; 690 pp->state.phase = init_phase(pp->state.mode); 691 pp->flags = 0; 692 pp->irqresponse = 0; 693 atomic_set(&pp->irqc, 0); 694 init_waitqueue_head(&pp->irq_wait); 695 696 /* Defer the actual device registration until the first claim. 697 * That way, we know whether or not the driver wants to have 698 * exclusive access to the port (PPEXCL). 699 */ 700 pp->pdev = NULL; 701 file->private_data = pp; 702 703 return 0; 704 } 705 706 static int pp_release(struct inode *inode, struct file *file) 707 { 708 unsigned int minor = iminor(inode); 709 struct pp_struct *pp = file->private_data; 710 int compat_negot; 711 712 compat_negot = 0; 713 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 714 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 715 struct ieee1284_info *info; 716 717 /* parport released, but not in compatibility mode */ 718 parport_claim_or_block(pp->pdev); 719 pp->flags |= PP_CLAIMED; 720 info = &pp->pdev->port->ieee1284; 721 pp->saved_state.mode = info->mode; 722 pp->saved_state.phase = info->phase; 723 info->mode = pp->state.mode; 724 info->phase = pp->state.phase; 725 compat_negot = 1; 726 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 727 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 728 compat_negot = 2; 729 } 730 if (compat_negot) { 731 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 732 dev_dbg(&pp->pdev->dev, 733 "negotiated back to compatibility mode because user-space forgot\n"); 734 } 735 736 if ((pp->flags & PP_CLAIMED) && pp->pdev) { 737 struct ieee1284_info *info; 738 739 info = &pp->pdev->port->ieee1284; 740 pp->state.mode = info->mode; 741 pp->state.phase = info->phase; 742 info->mode = pp->saved_state.mode; 743 info->phase = pp->saved_state.phase; 744 parport_release(pp->pdev); 745 if (compat_negot != 1) { 746 pr_debug(CHRDEV "%x: released pardevice " 747 "because user-space forgot\n", minor); 748 } 749 } 750 751 if (pp->pdev) { 752 parport_unregister_device(pp->pdev); 753 ida_free(&ida_index, pp->index); 754 pp->pdev = NULL; 755 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 756 } 757 758 kfree(pp); 759 760 return 0; 761 } 762 763 /* No kernel lock held - fine */ 764 static __poll_t pp_poll(struct file *file, poll_table *wait) 765 { 766 struct pp_struct *pp = file->private_data; 767 __poll_t mask = 0; 768 769 poll_wait(file, &pp->irq_wait, wait); 770 if (atomic_read(&pp->irqc)) 771 mask |= EPOLLIN | EPOLLRDNORM; 772 773 return mask; 774 } 775 776 static const struct class ppdev_class = { 777 .name = CHRDEV, 778 }; 779 780 static const struct file_operations pp_fops = { 781 .owner = THIS_MODULE, 782 .llseek = no_llseek, 783 .read = pp_read, 784 .write = pp_write, 785 .poll = pp_poll, 786 .unlocked_ioctl = pp_ioctl, 787 .compat_ioctl = compat_ptr_ioctl, 788 .open = pp_open, 789 .release = pp_release, 790 }; 791 792 static void pp_attach(struct parport *port) 793 { 794 struct device *ret; 795 796 if (devices[port->number]) 797 return; 798 799 ret = device_create(&ppdev_class, port->dev, 800 MKDEV(PP_MAJOR, port->number), NULL, 801 "parport%d", port->number); 802 if (IS_ERR(ret)) { 803 pr_err("Failed to create device parport%d\n", 804 port->number); 805 return; 806 } 807 devices[port->number] = ret; 808 } 809 810 static void pp_detach(struct parport *port) 811 { 812 if (!devices[port->number]) 813 return; 814 815 device_destroy(&ppdev_class, MKDEV(PP_MAJOR, port->number)); 816 devices[port->number] = NULL; 817 } 818 819 static int pp_probe(struct pardevice *par_dev) 820 { 821 struct device_driver *drv = par_dev->dev.driver; 822 int len = strlen(drv->name); 823 824 if (strncmp(par_dev->name, drv->name, len)) 825 return -ENODEV; 826 827 return 0; 828 } 829 830 static struct parport_driver pp_driver = { 831 .name = CHRDEV, 832 .probe = pp_probe, 833 .match_port = pp_attach, 834 .detach = pp_detach, 835 .devmodel = true, 836 }; 837 838 static int __init ppdev_init(void) 839 { 840 int err = 0; 841 842 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 843 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); 844 return -EIO; 845 } 846 err = class_register(&ppdev_class); 847 if (err) 848 goto out_chrdev; 849 850 err = parport_register_driver(&pp_driver); 851 if (err < 0) { 852 pr_warn(CHRDEV ": unable to register with parport\n"); 853 goto out_class; 854 } 855 856 pr_info(PP_VERSION "\n"); 857 goto out; 858 859 out_class: 860 class_unregister(&ppdev_class); 861 out_chrdev: 862 unregister_chrdev(PP_MAJOR, CHRDEV); 863 out: 864 return err; 865 } 866 867 static void __exit ppdev_cleanup(void) 868 { 869 /* Clean up all parport stuff */ 870 parport_unregister_driver(&pp_driver); 871 class_unregister(&ppdev_class); 872 unregister_chrdev(PP_MAJOR, CHRDEV); 873 } 874 875 module_init(ppdev_init); 876 module_exit(ppdev_cleanup); 877 878 MODULE_LICENSE("GPL"); 879 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 880