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