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.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/smp_lock.h> 71 #include <linux/uaccess.h> 72 73 #define PP_VERSION "ppdev: user-space parallel port driver" 74 #define CHRDEV "ppdev" 75 76 struct pp_struct { 77 struct pardevice * pdev; 78 wait_queue_head_t irq_wait; 79 atomic_t irqc; 80 unsigned int flags; 81 int irqresponse; 82 unsigned char irqctl; 83 struct ieee1284_info state; 84 struct ieee1284_info saved_state; 85 long default_inactivity; 86 }; 87 88 /* pp_struct.flags bitfields */ 89 #define PP_CLAIMED (1<<0) 90 #define PP_EXCL (1<<1) 91 92 /* Other constants */ 93 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 94 #define PP_BUFFER_SIZE 1024 95 #define PARDEVICE_MAX 8 96 97 /* ROUND_UP macro from fs/select.c */ 98 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 99 100 static inline void pp_enable_irq (struct pp_struct *pp) 101 { 102 struct parport *port = pp->pdev->port; 103 port->ops->enable_irq (port); 104 } 105 106 static ssize_t pp_read (struct file * file, char __user * buf, size_t count, 107 loff_t * ppos) 108 { 109 unsigned int minor = iminor(file->f_path.dentry->d_inode); 110 struct pp_struct *pp = file->private_data; 111 char * kbuffer; 112 ssize_t bytes_read = 0; 113 struct parport *pport; 114 int mode; 115 116 if (!(pp->flags & PP_CLAIMED)) { 117 /* Don't have the port claimed */ 118 pr_debug(CHRDEV "%x: claim the port first\n", minor); 119 return -EINVAL; 120 } 121 122 /* Trivial case. */ 123 if (count == 0) 124 return 0; 125 126 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 127 if (!kbuffer) { 128 return -ENOMEM; 129 } 130 pport = pp->pdev->port; 131 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 132 133 parport_set_timeout (pp->pdev, 134 (file->f_flags & O_NONBLOCK) ? 135 PARPORT_INACTIVITY_O_NONBLOCK : 136 pp->default_inactivity); 137 138 while (bytes_read == 0) { 139 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 140 141 if (mode == IEEE1284_MODE_EPP) { 142 /* various specials for EPP mode */ 143 int flags = 0; 144 size_t (*fn)(struct parport *, void *, size_t, int); 145 146 if (pp->flags & PP_W91284PIC) { 147 flags |= PARPORT_W91284PIC; 148 } 149 if (pp->flags & PP_FASTREAD) { 150 flags |= PARPORT_EPP_FAST; 151 } 152 if (pport->ieee1284.mode & IEEE1284_ADDR) { 153 fn = pport->ops->epp_read_addr; 154 } else { 155 fn = pport->ops->epp_read_data; 156 } 157 bytes_read = (*fn)(pport, kbuffer, need, flags); 158 } else { 159 bytes_read = parport_read (pport, kbuffer, need); 160 } 161 162 if (bytes_read != 0) 163 break; 164 165 if (file->f_flags & O_NONBLOCK) { 166 bytes_read = -EAGAIN; 167 break; 168 } 169 170 if (signal_pending (current)) { 171 bytes_read = -ERESTARTSYS; 172 break; 173 } 174 175 cond_resched(); 176 } 177 178 parport_set_timeout (pp->pdev, pp->default_inactivity); 179 180 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) 181 bytes_read = -EFAULT; 182 183 kfree (kbuffer); 184 pp_enable_irq (pp); 185 return bytes_read; 186 } 187 188 static ssize_t pp_write (struct file * file, const char __user * buf, 189 size_t count, loff_t * ppos) 190 { 191 unsigned int minor = iminor(file->f_path.dentry->d_inode); 192 struct pp_struct *pp = file->private_data; 193 char * kbuffer; 194 ssize_t bytes_written = 0; 195 ssize_t wrote; 196 int mode; 197 struct parport *pport; 198 199 if (!(pp->flags & PP_CLAIMED)) { 200 /* Don't have the port claimed */ 201 pr_debug(CHRDEV "%x: claim the port first\n", minor); 202 return -EINVAL; 203 } 204 205 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 206 if (!kbuffer) { 207 return -ENOMEM; 208 } 209 pport = pp->pdev->port; 210 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 211 212 parport_set_timeout (pp->pdev, 213 (file->f_flags & O_NONBLOCK) ? 214 PARPORT_INACTIVITY_O_NONBLOCK : 215 pp->default_inactivity); 216 217 while (bytes_written < count) { 218 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 219 220 if (copy_from_user (kbuffer, buf + bytes_written, n)) { 221 bytes_written = -EFAULT; 222 break; 223 } 224 225 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 226 /* do a fast EPP write */ 227 if (pport->ieee1284.mode & IEEE1284_ADDR) { 228 wrote = pport->ops->epp_write_addr (pport, 229 kbuffer, n, PARPORT_EPP_FAST); 230 } else { 231 wrote = pport->ops->epp_write_data (pport, 232 kbuffer, n, PARPORT_EPP_FAST); 233 } 234 } else { 235 wrote = parport_write (pp->pdev->port, kbuffer, n); 236 } 237 238 if (wrote <= 0) { 239 if (!bytes_written) { 240 bytes_written = wrote; 241 } 242 break; 243 } 244 245 bytes_written += wrote; 246 247 if (file->f_flags & O_NONBLOCK) { 248 if (!bytes_written) 249 bytes_written = -EAGAIN; 250 break; 251 } 252 253 if (signal_pending (current)) { 254 if (!bytes_written) { 255 bytes_written = -EINTR; 256 } 257 break; 258 } 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 int fl; 289 290 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); 291 if (name == NULL) 292 return -ENOMEM; 293 294 sprintf (name, CHRDEV "%x", minor); 295 296 port = parport_find_number (minor); 297 if (!port) { 298 printk (KERN_WARNING "%s: no associated port!\n", name); 299 kfree (name); 300 return -ENXIO; 301 } 302 303 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 304 pdev = parport_register_device (port, name, NULL, 305 NULL, pp_irq, fl, pp); 306 parport_put_port (port); 307 308 if (!pdev) { 309 printk (KERN_WARNING "%s: failed to register device!\n", name); 310 kfree (name); 311 return -ENXIO; 312 } 313 314 pp->pdev = pdev; 315 pr_debug("%s: registered pardevice\n", name); 316 return 0; 317 } 318 319 static enum ieee1284_phase init_phase (int mode) 320 { 321 switch (mode & ~(IEEE1284_DEVICEID 322 | IEEE1284_ADDR)) { 323 case IEEE1284_MODE_NIBBLE: 324 case IEEE1284_MODE_BYTE: 325 return IEEE1284_PH_REV_IDLE; 326 } 327 return IEEE1284_PH_FWD_IDLE; 328 } 329 330 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 331 { 332 unsigned int minor = iminor(file->f_path.dentry->d_inode); 333 struct pp_struct *pp = file->private_data; 334 struct parport * port; 335 void __user *argp = (void __user *)arg; 336 337 /* First handle the cases that don't take arguments. */ 338 switch (cmd) { 339 case PPCLAIM: 340 { 341 struct ieee1284_info *info; 342 int ret; 343 344 if (pp->flags & PP_CLAIMED) { 345 pr_debug(CHRDEV "%x: you've already got it!\n", minor); 346 return -EINVAL; 347 } 348 349 /* Deferred device registration. */ 350 if (!pp->pdev) { 351 int err = register_device (minor, pp); 352 if (err) { 353 return err; 354 } 355 } 356 357 ret = parport_claim_or_block (pp->pdev); 358 if (ret < 0) 359 return ret; 360 361 pp->flags |= PP_CLAIMED; 362 363 /* For interrupt-reporting to work, we need to be 364 * informed of each interrupt. */ 365 pp_enable_irq (pp); 366 367 /* We may need to fix up the state machine. */ 368 info = &pp->pdev->port->ieee1284; 369 pp->saved_state.mode = info->mode; 370 pp->saved_state.phase = info->phase; 371 info->mode = pp->state.mode; 372 info->phase = pp->state.phase; 373 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 374 parport_set_timeout (pp->pdev, pp->default_inactivity); 375 376 return 0; 377 } 378 case PPEXCL: 379 if (pp->pdev) { 380 pr_debug(CHRDEV "%x: too late for PPEXCL; " 381 "already registered\n", minor); 382 if (pp->flags & PP_EXCL) 383 /* But it's not really an error. */ 384 return 0; 385 /* There's no chance of making the driver happy. */ 386 return -EINVAL; 387 } 388 389 /* Just remember to register the device exclusively 390 * when we finally do the registration. */ 391 pp->flags |= PP_EXCL; 392 return 0; 393 case PPSETMODE: 394 { 395 int mode; 396 if (copy_from_user (&mode, argp, sizeof (mode))) 397 return -EFAULT; 398 /* FIXME: validate mode */ 399 pp->state.mode = mode; 400 pp->state.phase = init_phase (mode); 401 402 if (pp->flags & PP_CLAIMED) { 403 pp->pdev->port->ieee1284.mode = mode; 404 pp->pdev->port->ieee1284.phase = pp->state.phase; 405 } 406 407 return 0; 408 } 409 case PPGETMODE: 410 { 411 int mode; 412 413 if (pp->flags & PP_CLAIMED) { 414 mode = pp->pdev->port->ieee1284.mode; 415 } else { 416 mode = pp->state.mode; 417 } 418 if (copy_to_user (argp, &mode, sizeof (mode))) { 419 return -EFAULT; 420 } 421 return 0; 422 } 423 case PPSETPHASE: 424 { 425 int phase; 426 if (copy_from_user (&phase, argp, sizeof (phase))) { 427 return -EFAULT; 428 } 429 /* FIXME: validate phase */ 430 pp->state.phase = phase; 431 432 if (pp->flags & PP_CLAIMED) { 433 pp->pdev->port->ieee1284.phase = phase; 434 } 435 436 return 0; 437 } 438 case PPGETPHASE: 439 { 440 int phase; 441 442 if (pp->flags & PP_CLAIMED) { 443 phase = pp->pdev->port->ieee1284.phase; 444 } else { 445 phase = pp->state.phase; 446 } 447 if (copy_to_user (argp, &phase, sizeof (phase))) { 448 return -EFAULT; 449 } 450 return 0; 451 } 452 case PPGETMODES: 453 { 454 unsigned int modes; 455 456 port = parport_find_number (minor); 457 if (!port) 458 return -ENODEV; 459 460 modes = port->modes; 461 if (copy_to_user (argp, &modes, sizeof (modes))) { 462 return -EFAULT; 463 } 464 return 0; 465 } 466 case PPSETFLAGS: 467 { 468 int uflags; 469 470 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 471 return -EFAULT; 472 } 473 pp->flags &= ~PP_FLAGMASK; 474 pp->flags |= (uflags & PP_FLAGMASK); 475 return 0; 476 } 477 case PPGETFLAGS: 478 { 479 int uflags; 480 481 uflags = pp->flags & PP_FLAGMASK; 482 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 483 return -EFAULT; 484 } 485 return 0; 486 } 487 } /* end switch() */ 488 489 /* Everything else requires the port to be claimed, so check 490 * that now. */ 491 if ((pp->flags & PP_CLAIMED) == 0) { 492 pr_debug(CHRDEV "%x: claim the port first\n", minor); 493 return -EINVAL; 494 } 495 496 port = pp->pdev->port; 497 switch (cmd) { 498 struct ieee1284_info *info; 499 unsigned char reg; 500 unsigned char mask; 501 int mode; 502 int ret; 503 struct timeval par_timeout; 504 long to_jiffies; 505 506 case PPRSTATUS: 507 reg = parport_read_status (port); 508 if (copy_to_user (argp, ®, sizeof (reg))) 509 return -EFAULT; 510 return 0; 511 case PPRDATA: 512 reg = parport_read_data (port); 513 if (copy_to_user (argp, ®, sizeof (reg))) 514 return -EFAULT; 515 return 0; 516 case PPRCONTROL: 517 reg = parport_read_control (port); 518 if (copy_to_user (argp, ®, sizeof (reg))) 519 return -EFAULT; 520 return 0; 521 case PPYIELD: 522 parport_yield_blocking (pp->pdev); 523 return 0; 524 525 case PPRELEASE: 526 /* Save the state machine's state. */ 527 info = &pp->pdev->port->ieee1284; 528 pp->state.mode = info->mode; 529 pp->state.phase = info->phase; 530 info->mode = pp->saved_state.mode; 531 info->phase = pp->saved_state.phase; 532 parport_release (pp->pdev); 533 pp->flags &= ~PP_CLAIMED; 534 return 0; 535 536 case PPWCONTROL: 537 if (copy_from_user (®, argp, sizeof (reg))) 538 return -EFAULT; 539 parport_write_control (port, reg); 540 return 0; 541 542 case PPWDATA: 543 if (copy_from_user (®, argp, sizeof (reg))) 544 return -EFAULT; 545 parport_write_data (port, reg); 546 return 0; 547 548 case PPFCONTROL: 549 if (copy_from_user (&mask, argp, 550 sizeof (mask))) 551 return -EFAULT; 552 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 553 sizeof (reg))) 554 return -EFAULT; 555 parport_frob_control (port, mask, reg); 556 return 0; 557 558 case PPDATADIR: 559 if (copy_from_user (&mode, argp, sizeof (mode))) 560 return -EFAULT; 561 if (mode) 562 port->ops->data_reverse (port); 563 else 564 port->ops->data_forward (port); 565 return 0; 566 567 case PPNEGOT: 568 if (copy_from_user (&mode, argp, sizeof (mode))) 569 return -EFAULT; 570 switch ((ret = parport_negotiate (port, mode))) { 571 case 0: break; 572 case -1: /* handshake failed, peripheral not IEEE 1284 */ 573 ret = -EIO; 574 break; 575 case 1: /* handshake succeeded, peripheral rejected mode */ 576 ret = -ENXIO; 577 break; 578 } 579 pp_enable_irq (pp); 580 return ret; 581 582 case PPWCTLONIRQ: 583 if (copy_from_user (®, argp, sizeof (reg))) 584 return -EFAULT; 585 586 /* Remember what to set the control lines to, for next 587 * time we get an interrupt. */ 588 pp->irqctl = reg; 589 pp->irqresponse = 1; 590 return 0; 591 592 case PPCLRIRQ: 593 ret = atomic_read (&pp->irqc); 594 if (copy_to_user (argp, &ret, sizeof (ret))) 595 return -EFAULT; 596 atomic_sub (ret, &pp->irqc); 597 return 0; 598 599 case PPSETTIME: 600 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 601 return -EFAULT; 602 } 603 /* Convert to jiffies, place in pp->pdev->timeout */ 604 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 605 return -EINVAL; 606 } 607 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 608 to_jiffies += par_timeout.tv_sec * (long)HZ; 609 if (to_jiffies <= 0) { 610 return -EINVAL; 611 } 612 pp->pdev->timeout = to_jiffies; 613 return 0; 614 615 case PPGETTIME: 616 to_jiffies = pp->pdev->timeout; 617 par_timeout.tv_sec = to_jiffies / HZ; 618 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 619 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 620 return -EFAULT; 621 return 0; 622 623 default: 624 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); 625 return -EINVAL; 626 } 627 628 /* Keep the compiler happy */ 629 return 0; 630 } 631 632 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 633 { 634 long ret; 635 lock_kernel(); 636 ret = pp_do_ioctl(file, cmd, arg); 637 unlock_kernel(); 638 return ret; 639 } 640 641 static int pp_open (struct inode * inode, struct file * file) 642 { 643 unsigned int minor = iminor(inode); 644 struct pp_struct *pp; 645 646 cycle_kernel_lock(); 647 if (minor >= PARPORT_MAX) 648 return -ENXIO; 649 650 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 651 if (!pp) 652 return -ENOMEM; 653 654 pp->state.mode = IEEE1284_MODE_COMPAT; 655 pp->state.phase = init_phase (pp->state.mode); 656 pp->flags = 0; 657 pp->irqresponse = 0; 658 atomic_set (&pp->irqc, 0); 659 init_waitqueue_head (&pp->irq_wait); 660 661 /* Defer the actual device registration until the first claim. 662 * That way, we know whether or not the driver wants to have 663 * exclusive access to the port (PPEXCL). 664 */ 665 pp->pdev = NULL; 666 file->private_data = pp; 667 668 return 0; 669 } 670 671 static int pp_release (struct inode * inode, struct file * file) 672 { 673 unsigned int minor = iminor(inode); 674 struct pp_struct *pp = file->private_data; 675 int compat_negot; 676 677 compat_negot = 0; 678 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 679 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 680 struct ieee1284_info *info; 681 682 /* parport released, but not in compatibility mode */ 683 parport_claim_or_block (pp->pdev); 684 pp->flags |= PP_CLAIMED; 685 info = &pp->pdev->port->ieee1284; 686 pp->saved_state.mode = info->mode; 687 pp->saved_state.phase = info->phase; 688 info->mode = pp->state.mode; 689 info->phase = pp->state.phase; 690 compat_negot = 1; 691 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 692 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 693 compat_negot = 2; 694 } 695 if (compat_negot) { 696 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 697 pr_debug(CHRDEV "%x: negotiated back to compatibility " 698 "mode because user-space forgot\n", minor); 699 } 700 701 if (pp->flags & PP_CLAIMED) { 702 struct ieee1284_info *info; 703 704 info = &pp->pdev->port->ieee1284; 705 pp->state.mode = info->mode; 706 pp->state.phase = info->phase; 707 info->mode = pp->saved_state.mode; 708 info->phase = pp->saved_state.phase; 709 parport_release (pp->pdev); 710 if (compat_negot != 1) { 711 pr_debug(CHRDEV "%x: released pardevice " 712 "because user-space forgot\n", minor); 713 } 714 } 715 716 if (pp->pdev) { 717 const char *name = pp->pdev->name; 718 parport_unregister_device (pp->pdev); 719 kfree (name); 720 pp->pdev = NULL; 721 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 722 } 723 724 kfree (pp); 725 726 return 0; 727 } 728 729 /* No kernel lock held - fine */ 730 static unsigned int pp_poll (struct file * file, poll_table * wait) 731 { 732 struct pp_struct *pp = file->private_data; 733 unsigned int mask = 0; 734 735 poll_wait (file, &pp->irq_wait, wait); 736 if (atomic_read (&pp->irqc)) 737 mask |= POLLIN | POLLRDNORM; 738 739 return mask; 740 } 741 742 static struct class *ppdev_class; 743 744 static const struct file_operations pp_fops = { 745 .owner = THIS_MODULE, 746 .llseek = no_llseek, 747 .read = pp_read, 748 .write = pp_write, 749 .poll = pp_poll, 750 .unlocked_ioctl = pp_ioctl, 751 .open = pp_open, 752 .release = pp_release, 753 }; 754 755 static void pp_attach(struct parport *port) 756 { 757 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 758 NULL, "parport%d", port->number); 759 } 760 761 static void pp_detach(struct parport *port) 762 { 763 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 764 } 765 766 static struct parport_driver pp_driver = { 767 .name = CHRDEV, 768 .attach = pp_attach, 769 .detach = pp_detach, 770 }; 771 772 static int __init ppdev_init (void) 773 { 774 int err = 0; 775 776 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { 777 printk (KERN_WARNING CHRDEV ": unable to get major %d\n", 778 PP_MAJOR); 779 return -EIO; 780 } 781 ppdev_class = class_create(THIS_MODULE, CHRDEV); 782 if (IS_ERR(ppdev_class)) { 783 err = PTR_ERR(ppdev_class); 784 goto out_chrdev; 785 } 786 if (parport_register_driver(&pp_driver)) { 787 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 788 goto out_class; 789 } 790 791 printk (KERN_INFO PP_VERSION "\n"); 792 goto out; 793 794 out_class: 795 class_destroy(ppdev_class); 796 out_chrdev: 797 unregister_chrdev(PP_MAJOR, CHRDEV); 798 out: 799 return err; 800 } 801 802 static void __exit ppdev_cleanup (void) 803 { 804 /* Clean up all parport stuff */ 805 parport_unregister_driver(&pp_driver); 806 class_destroy(ppdev_class); 807 unregister_chrdev (PP_MAJOR, CHRDEV); 808 } 809 810 module_init(ppdev_init); 811 module_exit(ppdev_cleanup); 812 813 MODULE_LICENSE("GPL"); 814 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 815