1 /* 2 * linux/drivers/char/ppdev.c 3 * 4 * This is the code behind /dev/parport* -- it allows a user-space 5 * application to use the parport subsystem. 6 * 7 * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * A /dev/parportx device node represents an arbitrary device 15 * on port 'x'. The following operations are possible: 16 * 17 * open do nothing, set up default IEEE 1284 protocol to be COMPAT 18 * close release port and unregister device (if necessary) 19 * ioctl 20 * EXCL register device exclusively (may fail) 21 * CLAIM (register device first time) parport_claim_or_block 22 * RELEASE parport_release 23 * SETMODE set the IEEE 1284 protocol to use for read/write 24 * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be 25 * confused with ioctl(fd, SETPHASER, &stun). ;-) 26 * DATADIR data_forward / data_reverse 27 * WDATA write_data 28 * RDATA read_data 29 * WCONTROL write_control 30 * RCONTROL read_control 31 * FCONTROL frob_control 32 * RSTATUS read_status 33 * NEGOT parport_negotiate 34 * YIELD parport_yield_blocking 35 * WCTLONIRQ on interrupt, set control lines 36 * CLRIRQ clear (and return) interrupt count 37 * SETTIME sets device timeout (struct timeval) 38 * GETTIME gets device timeout (struct timeval) 39 * GETMODES gets hardware supported modes (unsigned int) 40 * GETMODE gets the current IEEE1284 mode 41 * GETPHASE gets the current IEEE1284 phase 42 * GETFLAGS gets current (user-visible) flags 43 * SETFLAGS sets current (user-visible) flags 44 * read/write read or write in current IEEE 1284 protocol 45 * select wait for interrupt (in readfds) 46 * 47 * Changes: 48 * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. 49 * 50 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 51 * - On error, copy_from_user and copy_to_user do not return -EFAULT, 52 * They return the positive number of bytes *not* copied due to address 53 * space errors. 54 * 55 * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. 56 * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 57 */ 58 59 #include <linux/module.h> 60 #include <linux/init.h> 61 #include <linux/sched/signal.h> 62 #include <linux/device.h> 63 #include <linux/ioctl.h> 64 #include <linux/parport.h> 65 #include <linux/ctype.h> 66 #include <linux/poll.h> 67 #include <linux/slab.h> 68 #include <linux/major.h> 69 #include <linux/ppdev.h> 70 #include <linux/mutex.h> 71 #include <linux/uaccess.h> 72 #include <linux/compat.h> 73 74 #define PP_VERSION "ppdev: user-space parallel port driver" 75 #define CHRDEV "ppdev" 76 77 struct pp_struct { 78 struct pardevice *pdev; 79 wait_queue_head_t irq_wait; 80 atomic_t irqc; 81 unsigned int flags; 82 int irqresponse; 83 unsigned char irqctl; 84 struct ieee1284_info state; 85 struct ieee1284_info saved_state; 86 long default_inactivity; 87 int index; 88 }; 89 90 /* should we use PARDEVICE_MAX here? */ 91 static struct device *devices[PARPORT_MAX]; 92 93 static DEFINE_IDA(ida_index); 94 95 /* pp_struct.flags bitfields */ 96 #define PP_CLAIMED (1<<0) 97 #define PP_EXCL (1<<1) 98 99 /* Other constants */ 100 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 101 #define PP_BUFFER_SIZE 1024 102 #define PARDEVICE_MAX 8 103 104 static DEFINE_MUTEX(pp_do_mutex); 105 106 /* define fixed sized ioctl cmd for y2038 migration */ 107 #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) 108 #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) 109 #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) 110 #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) 111 112 static inline void pp_enable_irq(struct pp_struct *pp) 113 { 114 struct parport *port = pp->pdev->port; 115 116 port->ops->enable_irq(port); 117 } 118 119 static ssize_t pp_read(struct file *file, char __user *buf, size_t count, 120 loff_t *ppos) 121 { 122 unsigned int minor = iminor(file_inode(file)); 123 struct pp_struct *pp = file->private_data; 124 char *kbuffer; 125 ssize_t bytes_read = 0; 126 struct parport *pport; 127 int mode; 128 129 if (!(pp->flags & PP_CLAIMED)) { 130 /* Don't have the port claimed */ 131 pr_debug(CHRDEV "%x: claim the port first\n", minor); 132 return -EINVAL; 133 } 134 135 /* Trivial case. */ 136 if (count == 0) 137 return 0; 138 139 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 140 if (!kbuffer) 141 return -ENOMEM; 142 pport = pp->pdev->port; 143 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 144 145 parport_set_timeout(pp->pdev, 146 (file->f_flags & O_NONBLOCK) ? 147 PARPORT_INACTIVITY_O_NONBLOCK : 148 pp->default_inactivity); 149 150 while (bytes_read == 0) { 151 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 152 153 if (mode == IEEE1284_MODE_EPP) { 154 /* various specials for EPP mode */ 155 int flags = 0; 156 size_t (*fn)(struct parport *, void *, size_t, int); 157 158 if (pp->flags & PP_W91284PIC) 159 flags |= PARPORT_W91284PIC; 160 if (pp->flags & PP_FASTREAD) 161 flags |= PARPORT_EPP_FAST; 162 if (pport->ieee1284.mode & IEEE1284_ADDR) 163 fn = pport->ops->epp_read_addr; 164 else 165 fn = pport->ops->epp_read_data; 166 bytes_read = (*fn)(pport, kbuffer, need, flags); 167 } else { 168 bytes_read = parport_read(pport, kbuffer, need); 169 } 170 171 if (bytes_read != 0) 172 break; 173 174 if (file->f_flags & O_NONBLOCK) { 175 bytes_read = -EAGAIN; 176 break; 177 } 178 179 if (signal_pending(current)) { 180 bytes_read = -ERESTARTSYS; 181 break; 182 } 183 184 cond_resched(); 185 } 186 187 parport_set_timeout(pp->pdev, pp->default_inactivity); 188 189 if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) 190 bytes_read = -EFAULT; 191 192 kfree(kbuffer); 193 pp_enable_irq(pp); 194 return bytes_read; 195 } 196 197 static ssize_t pp_write(struct file *file, const char __user *buf, 198 size_t count, loff_t *ppos) 199 { 200 unsigned int minor = iminor(file_inode(file)); 201 struct pp_struct *pp = file->private_data; 202 char *kbuffer; 203 ssize_t bytes_written = 0; 204 ssize_t wrote; 205 int mode; 206 struct parport *pport; 207 208 if (!(pp->flags & PP_CLAIMED)) { 209 /* Don't have the port claimed */ 210 pr_debug(CHRDEV "%x: claim the port first\n", minor); 211 return -EINVAL; 212 } 213 214 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 215 if (!kbuffer) 216 return -ENOMEM; 217 218 pport = pp->pdev->port; 219 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 220 221 parport_set_timeout(pp->pdev, 222 (file->f_flags & O_NONBLOCK) ? 223 PARPORT_INACTIVITY_O_NONBLOCK : 224 pp->default_inactivity); 225 226 while (bytes_written < count) { 227 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 228 229 if (copy_from_user(kbuffer, buf + bytes_written, n)) { 230 bytes_written = -EFAULT; 231 break; 232 } 233 234 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 235 /* do a fast EPP write */ 236 if (pport->ieee1284.mode & IEEE1284_ADDR) { 237 wrote = pport->ops->epp_write_addr(pport, 238 kbuffer, n, PARPORT_EPP_FAST); 239 } else { 240 wrote = pport->ops->epp_write_data(pport, 241 kbuffer, n, PARPORT_EPP_FAST); 242 } 243 } else { 244 wrote = parport_write(pp->pdev->port, kbuffer, n); 245 } 246 247 if (wrote <= 0) { 248 if (!bytes_written) 249 bytes_written = wrote; 250 break; 251 } 252 253 bytes_written += wrote; 254 255 if (file->f_flags & O_NONBLOCK) { 256 if (!bytes_written) 257 bytes_written = -EAGAIN; 258 break; 259 } 260 261 if (signal_pending(current)) 262 break; 263 264 cond_resched(); 265 } 266 267 parport_set_timeout(pp->pdev, pp->default_inactivity); 268 269 kfree(kbuffer); 270 pp_enable_irq(pp); 271 return bytes_written; 272 } 273 274 static void pp_irq(void *private) 275 { 276 struct pp_struct *pp = private; 277 278 if (pp->irqresponse) { 279 parport_write_control(pp->pdev->port, pp->irqctl); 280 pp->irqresponse = 0; 281 } 282 283 atomic_inc(&pp->irqc); 284 wake_up_interruptible(&pp->irq_wait); 285 } 286 287 static int register_device(int minor, struct pp_struct *pp) 288 { 289 struct parport *port; 290 struct pardevice *pdev = NULL; 291 char *name; 292 struct pardev_cb ppdev_cb; 293 int rc = 0, index; 294 295 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 296 if (name == NULL) 297 return -ENOMEM; 298 299 port = parport_find_number(minor); 300 if (!port) { 301 pr_warn("%s: no associated port!\n", name); 302 rc = -ENXIO; 303 goto err; 304 } 305 306 index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); 307 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 308 ppdev_cb.irq_func = pp_irq; 309 ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 310 ppdev_cb.private = pp; 311 pdev = parport_register_dev_model(port, name, &ppdev_cb, index); 312 parport_put_port(port); 313 314 if (!pdev) { 315 pr_warn("%s: failed to register device!\n", name); 316 rc = -ENXIO; 317 ida_simple_remove(&ida_index, index); 318 goto err; 319 } 320 321 pp->pdev = pdev; 322 pp->index = index; 323 dev_dbg(&pdev->dev, "registered pardevice\n"); 324 err: 325 kfree(name); 326 return rc; 327 } 328 329 static enum ieee1284_phase init_phase(int mode) 330 { 331 switch (mode & ~(IEEE1284_DEVICEID 332 | IEEE1284_ADDR)) { 333 case IEEE1284_MODE_NIBBLE: 334 case IEEE1284_MODE_BYTE: 335 return IEEE1284_PH_REV_IDLE; 336 } 337 return IEEE1284_PH_FWD_IDLE; 338 } 339 340 static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) 341 { 342 long to_jiffies; 343 344 if ((tv_sec < 0) || (tv_usec < 0)) 345 return -EINVAL; 346 347 to_jiffies = usecs_to_jiffies(tv_usec); 348 to_jiffies += tv_sec * HZ; 349 if (to_jiffies <= 0) 350 return -EINVAL; 351 352 pdev->timeout = to_jiffies; 353 return 0; 354 } 355 356 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 357 { 358 unsigned int minor = iminor(file_inode(file)); 359 struct pp_struct *pp = file->private_data; 360 struct parport *port; 361 void __user *argp = (void __user *)arg; 362 363 /* First handle the cases that don't take arguments. */ 364 switch (cmd) { 365 case PPCLAIM: 366 { 367 struct ieee1284_info *info; 368 int ret; 369 370 if (pp->flags & PP_CLAIMED) { 371 dev_dbg(&pp->pdev->dev, "you've already got it!\n"); 372 return -EINVAL; 373 } 374 375 /* Deferred device registration. */ 376 if (!pp->pdev) { 377 int err = register_device(minor, pp); 378 379 if (err) 380 return err; 381 } 382 383 ret = parport_claim_or_block(pp->pdev); 384 if (ret < 0) 385 return ret; 386 387 pp->flags |= PP_CLAIMED; 388 389 /* For interrupt-reporting to work, we need to be 390 * informed of each interrupt. */ 391 pp_enable_irq(pp); 392 393 /* We may need to fix up the state machine. */ 394 info = &pp->pdev->port->ieee1284; 395 pp->saved_state.mode = info->mode; 396 pp->saved_state.phase = info->phase; 397 info->mode = pp->state.mode; 398 info->phase = pp->state.phase; 399 pp->default_inactivity = parport_set_timeout(pp->pdev, 0); 400 parport_set_timeout(pp->pdev, pp->default_inactivity); 401 402 return 0; 403 } 404 case PPEXCL: 405 if (pp->pdev) { 406 dev_dbg(&pp->pdev->dev, 407 "too late for PPEXCL; already registered\n"); 408 if (pp->flags & PP_EXCL) 409 /* But it's not really an error. */ 410 return 0; 411 /* There's no chance of making the driver happy. */ 412 return -EINVAL; 413 } 414 415 /* Just remember to register the device exclusively 416 * when we finally do the registration. */ 417 pp->flags |= PP_EXCL; 418 return 0; 419 case PPSETMODE: 420 { 421 int mode; 422 423 if (copy_from_user(&mode, argp, sizeof(mode))) 424 return -EFAULT; 425 /* FIXME: validate mode */ 426 pp->state.mode = mode; 427 pp->state.phase = init_phase(mode); 428 429 if (pp->flags & PP_CLAIMED) { 430 pp->pdev->port->ieee1284.mode = mode; 431 pp->pdev->port->ieee1284.phase = pp->state.phase; 432 } 433 434 return 0; 435 } 436 case PPGETMODE: 437 { 438 int mode; 439 440 if (pp->flags & PP_CLAIMED) 441 mode = pp->pdev->port->ieee1284.mode; 442 else 443 mode = pp->state.mode; 444 445 if (copy_to_user(argp, &mode, sizeof(mode))) 446 return -EFAULT; 447 return 0; 448 } 449 case PPSETPHASE: 450 { 451 int phase; 452 453 if (copy_from_user(&phase, argp, sizeof(phase))) 454 return -EFAULT; 455 456 /* FIXME: validate phase */ 457 pp->state.phase = phase; 458 459 if (pp->flags & PP_CLAIMED) 460 pp->pdev->port->ieee1284.phase = phase; 461 462 return 0; 463 } 464 case PPGETPHASE: 465 { 466 int phase; 467 468 if (pp->flags & PP_CLAIMED) 469 phase = pp->pdev->port->ieee1284.phase; 470 else 471 phase = pp->state.phase; 472 if (copy_to_user(argp, &phase, sizeof(phase))) 473 return -EFAULT; 474 return 0; 475 } 476 case PPGETMODES: 477 { 478 unsigned int modes; 479 480 port = parport_find_number(minor); 481 if (!port) 482 return -ENODEV; 483 484 modes = port->modes; 485 parport_put_port(port); 486 if (copy_to_user(argp, &modes, sizeof(modes))) 487 return -EFAULT; 488 return 0; 489 } 490 case PPSETFLAGS: 491 { 492 int uflags; 493 494 if (copy_from_user(&uflags, argp, sizeof(uflags))) 495 return -EFAULT; 496 pp->flags &= ~PP_FLAGMASK; 497 pp->flags |= (uflags & PP_FLAGMASK); 498 return 0; 499 } 500 case PPGETFLAGS: 501 { 502 int uflags; 503 504 uflags = pp->flags & PP_FLAGMASK; 505 if (copy_to_user(argp, &uflags, sizeof(uflags))) 506 return -EFAULT; 507 return 0; 508 } 509 } /* end switch() */ 510 511 /* Everything else requires the port to be claimed, so check 512 * that now. */ 513 if ((pp->flags & PP_CLAIMED) == 0) { 514 pr_debug(CHRDEV "%x: claim the port first\n", minor); 515 return -EINVAL; 516 } 517 518 port = pp->pdev->port; 519 switch (cmd) { 520 struct ieee1284_info *info; 521 unsigned char reg; 522 unsigned char mask; 523 int mode; 524 s32 time32[2]; 525 s64 time64[2]; 526 struct timespec64 ts; 527 int ret; 528 529 case PPRSTATUS: 530 reg = parport_read_status(port); 531 if (copy_to_user(argp, ®, sizeof(reg))) 532 return -EFAULT; 533 return 0; 534 case PPRDATA: 535 reg = parport_read_data(port); 536 if (copy_to_user(argp, ®, sizeof(reg))) 537 return -EFAULT; 538 return 0; 539 case PPRCONTROL: 540 reg = parport_read_control(port); 541 if (copy_to_user(argp, ®, sizeof(reg))) 542 return -EFAULT; 543 return 0; 544 case PPYIELD: 545 parport_yield_blocking(pp->pdev); 546 return 0; 547 548 case PPRELEASE: 549 /* Save the state machine's state. */ 550 info = &pp->pdev->port->ieee1284; 551 pp->state.mode = info->mode; 552 pp->state.phase = info->phase; 553 info->mode = pp->saved_state.mode; 554 info->phase = pp->saved_state.phase; 555 parport_release(pp->pdev); 556 pp->flags &= ~PP_CLAIMED; 557 return 0; 558 559 case PPWCONTROL: 560 if (copy_from_user(®, argp, sizeof(reg))) 561 return -EFAULT; 562 parport_write_control(port, reg); 563 return 0; 564 565 case PPWDATA: 566 if (copy_from_user(®, argp, sizeof(reg))) 567 return -EFAULT; 568 parport_write_data(port, reg); 569 return 0; 570 571 case PPFCONTROL: 572 if (copy_from_user(&mask, argp, 573 sizeof(mask))) 574 return -EFAULT; 575 if (copy_from_user(®, 1 + (unsigned char __user *) arg, 576 sizeof(reg))) 577 return -EFAULT; 578 parport_frob_control(port, mask, reg); 579 return 0; 580 581 case PPDATADIR: 582 if (copy_from_user(&mode, argp, sizeof(mode))) 583 return -EFAULT; 584 if (mode) 585 port->ops->data_reverse(port); 586 else 587 port->ops->data_forward(port); 588 return 0; 589 590 case PPNEGOT: 591 if (copy_from_user(&mode, argp, sizeof(mode))) 592 return -EFAULT; 593 switch ((ret = parport_negotiate(port, mode))) { 594 case 0: break; 595 case -1: /* handshake failed, peripheral not IEEE 1284 */ 596 ret = -EIO; 597 break; 598 case 1: /* handshake succeeded, peripheral rejected mode */ 599 ret = -ENXIO; 600 break; 601 } 602 pp_enable_irq(pp); 603 return ret; 604 605 case PPWCTLONIRQ: 606 if (copy_from_user(®, argp, sizeof(reg))) 607 return -EFAULT; 608 609 /* Remember what to set the control lines to, for next 610 * time we get an interrupt. */ 611 pp->irqctl = reg; 612 pp->irqresponse = 1; 613 return 0; 614 615 case PPCLRIRQ: 616 ret = atomic_read(&pp->irqc); 617 if (copy_to_user(argp, &ret, sizeof(ret))) 618 return -EFAULT; 619 atomic_sub(ret, &pp->irqc); 620 return 0; 621 622 case PPSETTIME32: 623 if (copy_from_user(time32, argp, sizeof(time32))) 624 return -EFAULT; 625 626 return pp_set_timeout(pp->pdev, time32[0], time32[1]); 627 628 case PPSETTIME64: 629 if (copy_from_user(time64, argp, sizeof(time64))) 630 return -EFAULT; 631 632 return pp_set_timeout(pp->pdev, time64[0], time64[1]); 633 634 case PPGETTIME32: 635 jiffies_to_timespec64(pp->pdev->timeout, &ts); 636 time32[0] = ts.tv_sec; 637 time32[1] = ts.tv_nsec / NSEC_PER_USEC; 638 if ((time32[0] < 0) || (time32[1] < 0)) 639 return -EINVAL; 640 641 if (copy_to_user(argp, time32, sizeof(time32))) 642 return -EFAULT; 643 644 return 0; 645 646 case PPGETTIME64: 647 jiffies_to_timespec64(pp->pdev->timeout, &ts); 648 time64[0] = ts.tv_sec; 649 time64[1] = ts.tv_nsec / NSEC_PER_USEC; 650 if ((time64[0] < 0) || (time64[1] < 0)) 651 return -EINVAL; 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 #ifdef CONFIG_COMPAT 678 static long pp_compat_ioctl(struct file *file, unsigned int cmd, 679 unsigned long arg) 680 { 681 return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 682 } 683 #endif 684 685 static int pp_open(struct inode *inode, struct file *file) 686 { 687 unsigned int minor = iminor(inode); 688 struct pp_struct *pp; 689 690 if (minor >= PARPORT_MAX) 691 return -ENXIO; 692 693 pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL); 694 if (!pp) 695 return -ENOMEM; 696 697 pp->state.mode = IEEE1284_MODE_COMPAT; 698 pp->state.phase = init_phase(pp->state.mode); 699 pp->flags = 0; 700 pp->irqresponse = 0; 701 atomic_set(&pp->irqc, 0); 702 init_waitqueue_head(&pp->irq_wait); 703 704 /* Defer the actual device registration until the first claim. 705 * That way, we know whether or not the driver wants to have 706 * exclusive access to the port (PPEXCL). 707 */ 708 pp->pdev = NULL; 709 file->private_data = pp; 710 711 return 0; 712 } 713 714 static int pp_release(struct inode *inode, struct file *file) 715 { 716 unsigned int minor = iminor(inode); 717 struct pp_struct *pp = file->private_data; 718 int compat_negot; 719 720 compat_negot = 0; 721 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 722 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 723 struct ieee1284_info *info; 724 725 /* parport released, but not in compatibility mode */ 726 parport_claim_or_block(pp->pdev); 727 pp->flags |= PP_CLAIMED; 728 info = &pp->pdev->port->ieee1284; 729 pp->saved_state.mode = info->mode; 730 pp->saved_state.phase = info->phase; 731 info->mode = pp->state.mode; 732 info->phase = pp->state.phase; 733 compat_negot = 1; 734 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 735 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 736 compat_negot = 2; 737 } 738 if (compat_negot) { 739 parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT); 740 dev_dbg(&pp->pdev->dev, 741 "negotiated back to compatibility mode because user-space forgot\n"); 742 } 743 744 if (pp->flags & PP_CLAIMED) { 745 struct ieee1284_info *info; 746 747 info = &pp->pdev->port->ieee1284; 748 pp->state.mode = info->mode; 749 pp->state.phase = info->phase; 750 info->mode = pp->saved_state.mode; 751 info->phase = pp->saved_state.phase; 752 parport_release(pp->pdev); 753 if (compat_negot != 1) { 754 pr_debug(CHRDEV "%x: released pardevice " 755 "because user-space forgot\n", minor); 756 } 757 } 758 759 if (pp->pdev) { 760 parport_unregister_device(pp->pdev); 761 ida_simple_remove(&ida_index, pp->index); 762 pp->pdev = NULL; 763 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 764 } 765 766 kfree(pp); 767 768 return 0; 769 } 770 771 /* No kernel lock held - fine */ 772 static unsigned int pp_poll(struct file *file, poll_table *wait) 773 { 774 struct pp_struct *pp = file->private_data; 775 unsigned int mask = 0; 776 777 poll_wait(file, &pp->irq_wait, wait); 778 if (atomic_read(&pp->irqc)) 779 mask |= POLLIN | POLLRDNORM; 780 781 return mask; 782 } 783 784 static struct class *ppdev_class; 785 786 static const struct file_operations pp_fops = { 787 .owner = THIS_MODULE, 788 .llseek = no_llseek, 789 .read = pp_read, 790 .write = pp_write, 791 .poll = pp_poll, 792 .unlocked_ioctl = pp_ioctl, 793 #ifdef CONFIG_COMPAT 794 .compat_ioctl = pp_compat_ioctl, 795 #endif 796 .open = pp_open, 797 .release = pp_release, 798 }; 799 800 static void pp_attach(struct parport *port) 801 { 802 struct device *ret; 803 804 if (devices[port->number]) 805 return; 806 807 ret = device_create(ppdev_class, port->dev, 808 MKDEV(PP_MAJOR, port->number), NULL, 809 "parport%d", port->number); 810 if (IS_ERR(ret)) { 811 pr_err("Failed to create device parport%d\n", 812 port->number); 813 return; 814 } 815 devices[port->number] = ret; 816 } 817 818 static void pp_detach(struct parport *port) 819 { 820 if (!devices[port->number]) 821 return; 822 823 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 824 devices[port->number] = NULL; 825 } 826 827 static int pp_probe(struct pardevice *par_dev) 828 { 829 struct device_driver *drv = par_dev->dev.driver; 830 int len = strlen(drv->name); 831 832 if (strncmp(par_dev->name, drv->name, len)) 833 return -ENODEV; 834 835 return 0; 836 } 837 838 static struct parport_driver pp_driver = { 839 .name = CHRDEV, 840 .probe = pp_probe, 841 .match_port = pp_attach, 842 .detach = pp_detach, 843 .devmodel = true, 844 }; 845 846 static int __init ppdev_init(void) 847 { 848 int err = 0; 849 850 if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) { 851 pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR); 852 return -EIO; 853 } 854 ppdev_class = class_create(THIS_MODULE, CHRDEV); 855 if (IS_ERR(ppdev_class)) { 856 err = PTR_ERR(ppdev_class); 857 goto out_chrdev; 858 } 859 err = parport_register_driver(&pp_driver); 860 if (err < 0) { 861 pr_warn(CHRDEV ": unable to register with parport\n"); 862 goto out_class; 863 } 864 865 pr_info(PP_VERSION "\n"); 866 goto out; 867 868 out_class: 869 class_destroy(ppdev_class); 870 out_chrdev: 871 unregister_chrdev(PP_MAJOR, CHRDEV); 872 out: 873 return err; 874 } 875 876 static void __exit ppdev_cleanup(void) 877 { 878 /* Clean up all parport stuff */ 879 parport_unregister_driver(&pp_driver); 880 class_destroy(ppdev_class); 881 unregister_chrdev(PP_MAJOR, CHRDEV); 882 } 883 884 module_init(ppdev_init); 885 module_exit(ppdev_cleanup); 886 887 MODULE_LICENSE("GPL"); 888 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 889