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/major.h> 68 #include <linux/ppdev.h> 69 #include <linux/smp_lock.h> 70 #include <linux/uaccess.h> 71 72 #define PP_VERSION "ppdev: user-space parallel port driver" 73 #define CHRDEV "ppdev" 74 75 struct pp_struct { 76 struct pardevice * pdev; 77 wait_queue_head_t irq_wait; 78 atomic_t irqc; 79 unsigned int flags; 80 int irqresponse; 81 unsigned char irqctl; 82 struct ieee1284_info state; 83 struct ieee1284_info saved_state; 84 long default_inactivity; 85 }; 86 87 /* pp_struct.flags bitfields */ 88 #define PP_CLAIMED (1<<0) 89 #define PP_EXCL (1<<1) 90 91 /* Other constants */ 92 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 93 #define PP_BUFFER_SIZE 1024 94 #define PARDEVICE_MAX 8 95 96 /* ROUND_UP macro from fs/select.c */ 97 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 98 99 static inline void pp_enable_irq (struct pp_struct *pp) 100 { 101 struct parport *port = pp->pdev->port; 102 port->ops->enable_irq (port); 103 } 104 105 static ssize_t pp_read (struct file * file, char __user * buf, size_t count, 106 loff_t * ppos) 107 { 108 unsigned int minor = iminor(file->f_path.dentry->d_inode); 109 struct pp_struct *pp = file->private_data; 110 char * kbuffer; 111 ssize_t bytes_read = 0; 112 struct parport *pport; 113 int mode; 114 115 if (!(pp->flags & PP_CLAIMED)) { 116 /* Don't have the port claimed */ 117 pr_debug(CHRDEV "%x: claim the port first\n", minor); 118 return -EINVAL; 119 } 120 121 /* Trivial case. */ 122 if (count == 0) 123 return 0; 124 125 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 126 if (!kbuffer) { 127 return -ENOMEM; 128 } 129 pport = pp->pdev->port; 130 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 131 132 parport_set_timeout (pp->pdev, 133 (file->f_flags & O_NONBLOCK) ? 134 PARPORT_INACTIVITY_O_NONBLOCK : 135 pp->default_inactivity); 136 137 while (bytes_read == 0) { 138 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 139 140 if (mode == IEEE1284_MODE_EPP) { 141 /* various specials for EPP mode */ 142 int flags = 0; 143 size_t (*fn)(struct parport *, void *, size_t, int); 144 145 if (pp->flags & PP_W91284PIC) { 146 flags |= PARPORT_W91284PIC; 147 } 148 if (pp->flags & PP_FASTREAD) { 149 flags |= PARPORT_EPP_FAST; 150 } 151 if (pport->ieee1284.mode & IEEE1284_ADDR) { 152 fn = pport->ops->epp_read_addr; 153 } else { 154 fn = pport->ops->epp_read_data; 155 } 156 bytes_read = (*fn)(pport, kbuffer, need, flags); 157 } else { 158 bytes_read = parport_read (pport, kbuffer, need); 159 } 160 161 if (bytes_read != 0) 162 break; 163 164 if (file->f_flags & O_NONBLOCK) { 165 bytes_read = -EAGAIN; 166 break; 167 } 168 169 if (signal_pending (current)) { 170 bytes_read = -ERESTARTSYS; 171 break; 172 } 173 174 cond_resched(); 175 } 176 177 parport_set_timeout (pp->pdev, pp->default_inactivity); 178 179 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) 180 bytes_read = -EFAULT; 181 182 kfree (kbuffer); 183 pp_enable_irq (pp); 184 return bytes_read; 185 } 186 187 static ssize_t pp_write (struct file * file, const char __user * buf, 188 size_t count, loff_t * ppos) 189 { 190 unsigned int minor = iminor(file->f_path.dentry->d_inode); 191 struct pp_struct *pp = file->private_data; 192 char * kbuffer; 193 ssize_t bytes_written = 0; 194 ssize_t wrote; 195 int mode; 196 struct parport *pport; 197 198 if (!(pp->flags & PP_CLAIMED)) { 199 /* Don't have the port claimed */ 200 pr_debug(CHRDEV "%x: claim the port first\n", minor); 201 return -EINVAL; 202 } 203 204 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 205 if (!kbuffer) { 206 return -ENOMEM; 207 } 208 pport = pp->pdev->port; 209 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 210 211 parport_set_timeout (pp->pdev, 212 (file->f_flags & O_NONBLOCK) ? 213 PARPORT_INACTIVITY_O_NONBLOCK : 214 pp->default_inactivity); 215 216 while (bytes_written < count) { 217 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 218 219 if (copy_from_user (kbuffer, buf + bytes_written, n)) { 220 bytes_written = -EFAULT; 221 break; 222 } 223 224 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 225 /* do a fast EPP write */ 226 if (pport->ieee1284.mode & IEEE1284_ADDR) { 227 wrote = pport->ops->epp_write_addr (pport, 228 kbuffer, n, PARPORT_EPP_FAST); 229 } else { 230 wrote = pport->ops->epp_write_data (pport, 231 kbuffer, n, PARPORT_EPP_FAST); 232 } 233 } else { 234 wrote = parport_write (pp->pdev->port, kbuffer, n); 235 } 236 237 if (wrote <= 0) { 238 if (!bytes_written) { 239 bytes_written = wrote; 240 } 241 break; 242 } 243 244 bytes_written += wrote; 245 246 if (file->f_flags & O_NONBLOCK) { 247 if (!bytes_written) 248 bytes_written = -EAGAIN; 249 break; 250 } 251 252 if (signal_pending (current)) { 253 if (!bytes_written) { 254 bytes_written = -EINTR; 255 } 256 break; 257 } 258 259 cond_resched(); 260 } 261 262 parport_set_timeout (pp->pdev, pp->default_inactivity); 263 264 kfree (kbuffer); 265 pp_enable_irq (pp); 266 return bytes_written; 267 } 268 269 static void pp_irq (void *private) 270 { 271 struct pp_struct *pp = private; 272 273 if (pp->irqresponse) { 274 parport_write_control (pp->pdev->port, pp->irqctl); 275 pp->irqresponse = 0; 276 } 277 278 atomic_inc (&pp->irqc); 279 wake_up_interruptible (&pp->irq_wait); 280 } 281 282 static int register_device (int minor, struct pp_struct *pp) 283 { 284 struct parport *port; 285 struct pardevice * pdev = NULL; 286 char *name; 287 int fl; 288 289 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); 290 if (name == NULL) 291 return -ENOMEM; 292 293 sprintf (name, CHRDEV "%x", minor); 294 295 port = parport_find_number (minor); 296 if (!port) { 297 printk (KERN_WARNING "%s: no associated port!\n", name); 298 kfree (name); 299 return -ENXIO; 300 } 301 302 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 303 pdev = parport_register_device (port, name, NULL, 304 NULL, pp_irq, fl, pp); 305 parport_put_port (port); 306 307 if (!pdev) { 308 printk (KERN_WARNING "%s: failed to register device!\n", name); 309 kfree (name); 310 return -ENXIO; 311 } 312 313 pp->pdev = pdev; 314 pr_debug("%s: registered pardevice\n", name); 315 return 0; 316 } 317 318 static enum ieee1284_phase init_phase (int mode) 319 { 320 switch (mode & ~(IEEE1284_DEVICEID 321 | IEEE1284_ADDR)) { 322 case IEEE1284_MODE_NIBBLE: 323 case IEEE1284_MODE_BYTE: 324 return IEEE1284_PH_REV_IDLE; 325 } 326 return IEEE1284_PH_FWD_IDLE; 327 } 328 329 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 330 { 331 unsigned int minor = iminor(file->f_path.dentry->d_inode); 332 struct pp_struct *pp = file->private_data; 333 struct parport * port; 334 void __user *argp = (void __user *)arg; 335 336 /* First handle the cases that don't take arguments. */ 337 switch (cmd) { 338 case PPCLAIM: 339 { 340 struct ieee1284_info *info; 341 int ret; 342 343 if (pp->flags & PP_CLAIMED) { 344 pr_debug(CHRDEV "%x: you've already got it!\n", minor); 345 return -EINVAL; 346 } 347 348 /* Deferred device registration. */ 349 if (!pp->pdev) { 350 int err = register_device (minor, pp); 351 if (err) { 352 return err; 353 } 354 } 355 356 ret = parport_claim_or_block (pp->pdev); 357 if (ret < 0) 358 return ret; 359 360 pp->flags |= PP_CLAIMED; 361 362 /* For interrupt-reporting to work, we need to be 363 * informed of each interrupt. */ 364 pp_enable_irq (pp); 365 366 /* We may need to fix up the state machine. */ 367 info = &pp->pdev->port->ieee1284; 368 pp->saved_state.mode = info->mode; 369 pp->saved_state.phase = info->phase; 370 info->mode = pp->state.mode; 371 info->phase = pp->state.phase; 372 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 373 parport_set_timeout (pp->pdev, pp->default_inactivity); 374 375 return 0; 376 } 377 case PPEXCL: 378 if (pp->pdev) { 379 pr_debug(CHRDEV "%x: too late for PPEXCL; " 380 "already registered\n", minor); 381 if (pp->flags & PP_EXCL) 382 /* But it's not really an error. */ 383 return 0; 384 /* There's no chance of making the driver happy. */ 385 return -EINVAL; 386 } 387 388 /* Just remember to register the device exclusively 389 * when we finally do the registration. */ 390 pp->flags |= PP_EXCL; 391 return 0; 392 case PPSETMODE: 393 { 394 int mode; 395 if (copy_from_user (&mode, argp, sizeof (mode))) 396 return -EFAULT; 397 /* FIXME: validate mode */ 398 pp->state.mode = mode; 399 pp->state.phase = init_phase (mode); 400 401 if (pp->flags & PP_CLAIMED) { 402 pp->pdev->port->ieee1284.mode = mode; 403 pp->pdev->port->ieee1284.phase = pp->state.phase; 404 } 405 406 return 0; 407 } 408 case PPGETMODE: 409 { 410 int mode; 411 412 if (pp->flags & PP_CLAIMED) { 413 mode = pp->pdev->port->ieee1284.mode; 414 } else { 415 mode = pp->state.mode; 416 } 417 if (copy_to_user (argp, &mode, sizeof (mode))) { 418 return -EFAULT; 419 } 420 return 0; 421 } 422 case PPSETPHASE: 423 { 424 int phase; 425 if (copy_from_user (&phase, argp, sizeof (phase))) { 426 return -EFAULT; 427 } 428 /* FIXME: validate phase */ 429 pp->state.phase = phase; 430 431 if (pp->flags & PP_CLAIMED) { 432 pp->pdev->port->ieee1284.phase = phase; 433 } 434 435 return 0; 436 } 437 case PPGETPHASE: 438 { 439 int phase; 440 441 if (pp->flags & PP_CLAIMED) { 442 phase = pp->pdev->port->ieee1284.phase; 443 } else { 444 phase = pp->state.phase; 445 } 446 if (copy_to_user (argp, &phase, sizeof (phase))) { 447 return -EFAULT; 448 } 449 return 0; 450 } 451 case PPGETMODES: 452 { 453 unsigned int modes; 454 455 port = parport_find_number (minor); 456 if (!port) 457 return -ENODEV; 458 459 modes = port->modes; 460 if (copy_to_user (argp, &modes, sizeof (modes))) { 461 return -EFAULT; 462 } 463 return 0; 464 } 465 case PPSETFLAGS: 466 { 467 int uflags; 468 469 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 470 return -EFAULT; 471 } 472 pp->flags &= ~PP_FLAGMASK; 473 pp->flags |= (uflags & PP_FLAGMASK); 474 return 0; 475 } 476 case PPGETFLAGS: 477 { 478 int uflags; 479 480 uflags = pp->flags & PP_FLAGMASK; 481 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 482 return -EFAULT; 483 } 484 return 0; 485 } 486 } /* end switch() */ 487 488 /* Everything else requires the port to be claimed, so check 489 * that now. */ 490 if ((pp->flags & PP_CLAIMED) == 0) { 491 pr_debug(CHRDEV "%x: claim the port first\n", minor); 492 return -EINVAL; 493 } 494 495 port = pp->pdev->port; 496 switch (cmd) { 497 struct ieee1284_info *info; 498 unsigned char reg; 499 unsigned char mask; 500 int mode; 501 int ret; 502 struct timeval par_timeout; 503 long to_jiffies; 504 505 case PPRSTATUS: 506 reg = parport_read_status (port); 507 if (copy_to_user (argp, ®, sizeof (reg))) 508 return -EFAULT; 509 return 0; 510 case PPRDATA: 511 reg = parport_read_data (port); 512 if (copy_to_user (argp, ®, sizeof (reg))) 513 return -EFAULT; 514 return 0; 515 case PPRCONTROL: 516 reg = parport_read_control (port); 517 if (copy_to_user (argp, ®, sizeof (reg))) 518 return -EFAULT; 519 return 0; 520 case PPYIELD: 521 parport_yield_blocking (pp->pdev); 522 return 0; 523 524 case PPRELEASE: 525 /* Save the state machine's state. */ 526 info = &pp->pdev->port->ieee1284; 527 pp->state.mode = info->mode; 528 pp->state.phase = info->phase; 529 info->mode = pp->saved_state.mode; 530 info->phase = pp->saved_state.phase; 531 parport_release (pp->pdev); 532 pp->flags &= ~PP_CLAIMED; 533 return 0; 534 535 case PPWCONTROL: 536 if (copy_from_user (®, argp, sizeof (reg))) 537 return -EFAULT; 538 parport_write_control (port, reg); 539 return 0; 540 541 case PPWDATA: 542 if (copy_from_user (®, argp, sizeof (reg))) 543 return -EFAULT; 544 parport_write_data (port, reg); 545 return 0; 546 547 case PPFCONTROL: 548 if (copy_from_user (&mask, argp, 549 sizeof (mask))) 550 return -EFAULT; 551 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 552 sizeof (reg))) 553 return -EFAULT; 554 parport_frob_control (port, mask, reg); 555 return 0; 556 557 case PPDATADIR: 558 if (copy_from_user (&mode, argp, sizeof (mode))) 559 return -EFAULT; 560 if (mode) 561 port->ops->data_reverse (port); 562 else 563 port->ops->data_forward (port); 564 return 0; 565 566 case PPNEGOT: 567 if (copy_from_user (&mode, argp, sizeof (mode))) 568 return -EFAULT; 569 switch ((ret = parport_negotiate (port, mode))) { 570 case 0: break; 571 case -1: /* handshake failed, peripheral not IEEE 1284 */ 572 ret = -EIO; 573 break; 574 case 1: /* handshake succeeded, peripheral rejected mode */ 575 ret = -ENXIO; 576 break; 577 } 578 pp_enable_irq (pp); 579 return ret; 580 581 case PPWCTLONIRQ: 582 if (copy_from_user (®, argp, sizeof (reg))) 583 return -EFAULT; 584 585 /* Remember what to set the control lines to, for next 586 * time we get an interrupt. */ 587 pp->irqctl = reg; 588 pp->irqresponse = 1; 589 return 0; 590 591 case PPCLRIRQ: 592 ret = atomic_read (&pp->irqc); 593 if (copy_to_user (argp, &ret, sizeof (ret))) 594 return -EFAULT; 595 atomic_sub (ret, &pp->irqc); 596 return 0; 597 598 case PPSETTIME: 599 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 600 return -EFAULT; 601 } 602 /* Convert to jiffies, place in pp->pdev->timeout */ 603 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 604 return -EINVAL; 605 } 606 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 607 to_jiffies += par_timeout.tv_sec * (long)HZ; 608 if (to_jiffies <= 0) { 609 return -EINVAL; 610 } 611 pp->pdev->timeout = to_jiffies; 612 return 0; 613 614 case PPGETTIME: 615 to_jiffies = pp->pdev->timeout; 616 par_timeout.tv_sec = to_jiffies / HZ; 617 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 618 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 619 return -EFAULT; 620 return 0; 621 622 default: 623 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); 624 return -EINVAL; 625 } 626 627 /* Keep the compiler happy */ 628 return 0; 629 } 630 631 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 632 { 633 long ret; 634 lock_kernel(); 635 ret = pp_do_ioctl(file, cmd, arg); 636 unlock_kernel(); 637 return ret; 638 } 639 640 static int pp_open (struct inode * inode, struct file * file) 641 { 642 unsigned int minor = iminor(inode); 643 struct pp_struct *pp; 644 645 cycle_kernel_lock(); 646 if (minor >= PARPORT_MAX) 647 return -ENXIO; 648 649 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 650 if (!pp) 651 return -ENOMEM; 652 653 pp->state.mode = IEEE1284_MODE_COMPAT; 654 pp->state.phase = init_phase (pp->state.mode); 655 pp->flags = 0; 656 pp->irqresponse = 0; 657 atomic_set (&pp->irqc, 0); 658 init_waitqueue_head (&pp->irq_wait); 659 660 /* Defer the actual device registration until the first claim. 661 * That way, we know whether or not the driver wants to have 662 * exclusive access to the port (PPEXCL). 663 */ 664 pp->pdev = NULL; 665 file->private_data = pp; 666 667 return 0; 668 } 669 670 static int pp_release (struct inode * inode, struct file * file) 671 { 672 unsigned int minor = iminor(inode); 673 struct pp_struct *pp = file->private_data; 674 int compat_negot; 675 676 compat_negot = 0; 677 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 678 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 679 struct ieee1284_info *info; 680 681 /* parport released, but not in compatibility mode */ 682 parport_claim_or_block (pp->pdev); 683 pp->flags |= PP_CLAIMED; 684 info = &pp->pdev->port->ieee1284; 685 pp->saved_state.mode = info->mode; 686 pp->saved_state.phase = info->phase; 687 info->mode = pp->state.mode; 688 info->phase = pp->state.phase; 689 compat_negot = 1; 690 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 691 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 692 compat_negot = 2; 693 } 694 if (compat_negot) { 695 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 696 pr_debug(CHRDEV "%x: negotiated back to compatibility " 697 "mode because user-space forgot\n", minor); 698 } 699 700 if (pp->flags & PP_CLAIMED) { 701 struct ieee1284_info *info; 702 703 info = &pp->pdev->port->ieee1284; 704 pp->state.mode = info->mode; 705 pp->state.phase = info->phase; 706 info->mode = pp->saved_state.mode; 707 info->phase = pp->saved_state.phase; 708 parport_release (pp->pdev); 709 if (compat_negot != 1) { 710 pr_debug(CHRDEV "%x: released pardevice " 711 "because user-space forgot\n", minor); 712 } 713 } 714 715 if (pp->pdev) { 716 const char *name = pp->pdev->name; 717 parport_unregister_device (pp->pdev); 718 kfree (name); 719 pp->pdev = NULL; 720 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 721 } 722 723 kfree (pp); 724 725 return 0; 726 } 727 728 /* No kernel lock held - fine */ 729 static unsigned int pp_poll (struct file * file, poll_table * wait) 730 { 731 struct pp_struct *pp = file->private_data; 732 unsigned int mask = 0; 733 734 poll_wait (file, &pp->irq_wait, wait); 735 if (atomic_read (&pp->irqc)) 736 mask |= POLLIN | POLLRDNORM; 737 738 return mask; 739 } 740 741 static struct class *ppdev_class; 742 743 static const struct file_operations pp_fops = { 744 .owner = THIS_MODULE, 745 .llseek = no_llseek, 746 .read = pp_read, 747 .write = pp_write, 748 .poll = pp_poll, 749 .unlocked_ioctl = pp_ioctl, 750 .open = pp_open, 751 .release = pp_release, 752 }; 753 754 static void pp_attach(struct parport *port) 755 { 756 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 757 NULL, "parport%d", port->number); 758 } 759 760 static void pp_detach(struct parport *port) 761 { 762 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 763 } 764 765 static struct parport_driver pp_driver = { 766 .name = CHRDEV, 767 .attach = pp_attach, 768 .detach = pp_detach, 769 }; 770 771 static int __init ppdev_init (void) 772 { 773 int err = 0; 774 775 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { 776 printk (KERN_WARNING CHRDEV ": unable to get major %d\n", 777 PP_MAJOR); 778 return -EIO; 779 } 780 ppdev_class = class_create(THIS_MODULE, CHRDEV); 781 if (IS_ERR(ppdev_class)) { 782 err = PTR_ERR(ppdev_class); 783 goto out_chrdev; 784 } 785 if (parport_register_driver(&pp_driver)) { 786 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 787 goto out_class; 788 } 789 790 printk (KERN_INFO PP_VERSION "\n"); 791 goto out; 792 793 out_class: 794 class_destroy(ppdev_class); 795 out_chrdev: 796 unregister_chrdev(PP_MAJOR, CHRDEV); 797 out: 798 return err; 799 } 800 801 static void __exit ppdev_cleanup (void) 802 { 803 /* Clean up all parport stuff */ 804 parport_unregister_driver(&pp_driver); 805 class_destroy(ppdev_class); 806 unregister_chrdev (PP_MAJOR, CHRDEV); 807 } 808 809 module_init(ppdev_init); 810 module_exit(ppdev_cleanup); 811 812 MODULE_LICENSE("GPL"); 813 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 814