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 <asm/uaccess.h> 70 71 #define PP_VERSION "ppdev: user-space parallel port driver" 72 #define CHRDEV "ppdev" 73 74 struct pp_struct { 75 struct pardevice * pdev; 76 wait_queue_head_t irq_wait; 77 atomic_t irqc; 78 unsigned int flags; 79 int irqresponse; 80 unsigned char irqctl; 81 struct ieee1284_info state; 82 struct ieee1284_info saved_state; 83 long default_inactivity; 84 }; 85 86 /* pp_struct.flags bitfields */ 87 #define PP_CLAIMED (1<<0) 88 #define PP_EXCL (1<<1) 89 90 /* Other constants */ 91 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 92 #define PP_BUFFER_SIZE 1024 93 #define PARDEVICE_MAX 8 94 95 /* ROUND_UP macro from fs/select.c */ 96 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 97 98 static inline void pp_enable_irq (struct pp_struct *pp) 99 { 100 struct parport *port = pp->pdev->port; 101 port->ops->enable_irq (port); 102 } 103 104 static ssize_t pp_read (struct file * file, char __user * buf, size_t count, 105 loff_t * ppos) 106 { 107 unsigned int minor = iminor(file->f_path.dentry->d_inode); 108 struct pp_struct *pp = file->private_data; 109 char * kbuffer; 110 ssize_t bytes_read = 0; 111 struct parport *pport; 112 int mode; 113 114 if (!(pp->flags & PP_CLAIMED)) { 115 /* Don't have the port claimed */ 116 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 117 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 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 201 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 printk (KERN_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_ioctl(struct inode *inode, struct file *file, 331 unsigned int cmd, unsigned long arg) 332 { 333 unsigned int minor = iminor(inode); 334 struct pp_struct *pp = file->private_data; 335 struct parport * port; 336 void __user *argp = (void __user *)arg; 337 338 /* First handle the cases that don't take arguments. */ 339 switch (cmd) { 340 case PPCLAIM: 341 { 342 struct ieee1284_info *info; 343 int ret; 344 345 if (pp->flags & PP_CLAIMED) { 346 printk (KERN_DEBUG CHRDEV 347 "%x: you've already got it!\n", minor); 348 return -EINVAL; 349 } 350 351 /* Deferred device registration. */ 352 if (!pp->pdev) { 353 int err = register_device (minor, pp); 354 if (err) { 355 return err; 356 } 357 } 358 359 ret = parport_claim_or_block (pp->pdev); 360 if (ret < 0) 361 return ret; 362 363 pp->flags |= PP_CLAIMED; 364 365 /* For interrupt-reporting to work, we need to be 366 * informed of each interrupt. */ 367 pp_enable_irq (pp); 368 369 /* We may need to fix up the state machine. */ 370 info = &pp->pdev->port->ieee1284; 371 pp->saved_state.mode = info->mode; 372 pp->saved_state.phase = info->phase; 373 info->mode = pp->state.mode; 374 info->phase = pp->state.phase; 375 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 376 parport_set_timeout (pp->pdev, pp->default_inactivity); 377 378 return 0; 379 } 380 case PPEXCL: 381 if (pp->pdev) { 382 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " 383 "already registered\n", minor); 384 if (pp->flags & PP_EXCL) 385 /* But it's not really an error. */ 386 return 0; 387 /* There's no chance of making the driver happy. */ 388 return -EINVAL; 389 } 390 391 /* Just remember to register the device exclusively 392 * when we finally do the registration. */ 393 pp->flags |= PP_EXCL; 394 return 0; 395 case PPSETMODE: 396 { 397 int mode; 398 if (copy_from_user (&mode, argp, sizeof (mode))) 399 return -EFAULT; 400 /* FIXME: validate mode */ 401 pp->state.mode = mode; 402 pp->state.phase = init_phase (mode); 403 404 if (pp->flags & PP_CLAIMED) { 405 pp->pdev->port->ieee1284.mode = mode; 406 pp->pdev->port->ieee1284.phase = pp->state.phase; 407 } 408 409 return 0; 410 } 411 case PPGETMODE: 412 { 413 int mode; 414 415 if (pp->flags & PP_CLAIMED) { 416 mode = pp->pdev->port->ieee1284.mode; 417 } else { 418 mode = pp->state.mode; 419 } 420 if (copy_to_user (argp, &mode, sizeof (mode))) { 421 return -EFAULT; 422 } 423 return 0; 424 } 425 case PPSETPHASE: 426 { 427 int phase; 428 if (copy_from_user (&phase, argp, sizeof (phase))) { 429 return -EFAULT; 430 } 431 /* FIXME: validate phase */ 432 pp->state.phase = phase; 433 434 if (pp->flags & PP_CLAIMED) { 435 pp->pdev->port->ieee1284.phase = phase; 436 } 437 438 return 0; 439 } 440 case PPGETPHASE: 441 { 442 int phase; 443 444 if (pp->flags & PP_CLAIMED) { 445 phase = pp->pdev->port->ieee1284.phase; 446 } else { 447 phase = pp->state.phase; 448 } 449 if (copy_to_user (argp, &phase, sizeof (phase))) { 450 return -EFAULT; 451 } 452 return 0; 453 } 454 case PPGETMODES: 455 { 456 unsigned int modes; 457 458 port = parport_find_number (minor); 459 if (!port) 460 return -ENODEV; 461 462 modes = port->modes; 463 if (copy_to_user (argp, &modes, sizeof (modes))) { 464 return -EFAULT; 465 } 466 return 0; 467 } 468 case PPSETFLAGS: 469 { 470 int uflags; 471 472 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 473 return -EFAULT; 474 } 475 pp->flags &= ~PP_FLAGMASK; 476 pp->flags |= (uflags & PP_FLAGMASK); 477 return 0; 478 } 479 case PPGETFLAGS: 480 { 481 int uflags; 482 483 uflags = pp->flags & PP_FLAGMASK; 484 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 485 return -EFAULT; 486 } 487 return 0; 488 } 489 } /* end switch() */ 490 491 /* Everything else requires the port to be claimed, so check 492 * that now. */ 493 if ((pp->flags & PP_CLAIMED) == 0) { 494 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 495 minor); 496 return -EINVAL; 497 } 498 499 port = pp->pdev->port; 500 switch (cmd) { 501 struct ieee1284_info *info; 502 unsigned char reg; 503 unsigned char mask; 504 int mode; 505 int ret; 506 struct timeval par_timeout; 507 long to_jiffies; 508 509 case PPRSTATUS: 510 reg = parport_read_status (port); 511 if (copy_to_user (argp, ®, sizeof (reg))) 512 return -EFAULT; 513 return 0; 514 case PPRDATA: 515 reg = parport_read_data (port); 516 if (copy_to_user (argp, ®, sizeof (reg))) 517 return -EFAULT; 518 return 0; 519 case PPRCONTROL: 520 reg = parport_read_control (port); 521 if (copy_to_user (argp, ®, sizeof (reg))) 522 return -EFAULT; 523 return 0; 524 case PPYIELD: 525 parport_yield_blocking (pp->pdev); 526 return 0; 527 528 case PPRELEASE: 529 /* Save the state machine's state. */ 530 info = &pp->pdev->port->ieee1284; 531 pp->state.mode = info->mode; 532 pp->state.phase = info->phase; 533 info->mode = pp->saved_state.mode; 534 info->phase = pp->saved_state.phase; 535 parport_release (pp->pdev); 536 pp->flags &= ~PP_CLAIMED; 537 return 0; 538 539 case PPWCONTROL: 540 if (copy_from_user (®, argp, sizeof (reg))) 541 return -EFAULT; 542 parport_write_control (port, reg); 543 return 0; 544 545 case PPWDATA: 546 if (copy_from_user (®, argp, sizeof (reg))) 547 return -EFAULT; 548 parport_write_data (port, reg); 549 return 0; 550 551 case PPFCONTROL: 552 if (copy_from_user (&mask, argp, 553 sizeof (mask))) 554 return -EFAULT; 555 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 556 sizeof (reg))) 557 return -EFAULT; 558 parport_frob_control (port, mask, reg); 559 return 0; 560 561 case PPDATADIR: 562 if (copy_from_user (&mode, argp, sizeof (mode))) 563 return -EFAULT; 564 if (mode) 565 port->ops->data_reverse (port); 566 else 567 port->ops->data_forward (port); 568 return 0; 569 570 case PPNEGOT: 571 if (copy_from_user (&mode, argp, sizeof (mode))) 572 return -EFAULT; 573 switch ((ret = parport_negotiate (port, mode))) { 574 case 0: break; 575 case -1: /* handshake failed, peripheral not IEEE 1284 */ 576 ret = -EIO; 577 break; 578 case 1: /* handshake succeeded, peripheral rejected mode */ 579 ret = -ENXIO; 580 break; 581 } 582 pp_enable_irq (pp); 583 return ret; 584 585 case PPWCTLONIRQ: 586 if (copy_from_user (®, argp, sizeof (reg))) 587 return -EFAULT; 588 589 /* Remember what to set the control lines to, for next 590 * time we get an interrupt. */ 591 pp->irqctl = reg; 592 pp->irqresponse = 1; 593 return 0; 594 595 case PPCLRIRQ: 596 ret = atomic_read (&pp->irqc); 597 if (copy_to_user (argp, &ret, sizeof (ret))) 598 return -EFAULT; 599 atomic_sub (ret, &pp->irqc); 600 return 0; 601 602 case PPSETTIME: 603 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 604 return -EFAULT; 605 } 606 /* Convert to jiffies, place in pp->pdev->timeout */ 607 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 608 return -EINVAL; 609 } 610 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 611 to_jiffies += par_timeout.tv_sec * (long)HZ; 612 if (to_jiffies <= 0) { 613 return -EINVAL; 614 } 615 pp->pdev->timeout = to_jiffies; 616 return 0; 617 618 case PPGETTIME: 619 to_jiffies = pp->pdev->timeout; 620 par_timeout.tv_sec = to_jiffies / HZ; 621 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 622 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 623 return -EFAULT; 624 return 0; 625 626 default: 627 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, 628 cmd); 629 return -EINVAL; 630 } 631 632 /* Keep the compiler happy */ 633 return 0; 634 } 635 636 static int pp_open (struct inode * inode, struct file * file) 637 { 638 unsigned int minor = iminor(inode); 639 struct pp_struct *pp; 640 641 if (minor >= PARPORT_MAX) 642 return -ENXIO; 643 644 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 645 if (!pp) 646 return -ENOMEM; 647 648 pp->state.mode = IEEE1284_MODE_COMPAT; 649 pp->state.phase = init_phase (pp->state.mode); 650 pp->flags = 0; 651 pp->irqresponse = 0; 652 atomic_set (&pp->irqc, 0); 653 init_waitqueue_head (&pp->irq_wait); 654 655 /* Defer the actual device registration until the first claim. 656 * That way, we know whether or not the driver wants to have 657 * exclusive access to the port (PPEXCL). 658 */ 659 pp->pdev = NULL; 660 file->private_data = pp; 661 662 return 0; 663 } 664 665 static int pp_release (struct inode * inode, struct file * file) 666 { 667 unsigned int minor = iminor(inode); 668 struct pp_struct *pp = file->private_data; 669 int compat_negot; 670 671 compat_negot = 0; 672 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 673 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 674 struct ieee1284_info *info; 675 676 /* parport released, but not in compatibility mode */ 677 parport_claim_or_block (pp->pdev); 678 pp->flags |= PP_CLAIMED; 679 info = &pp->pdev->port->ieee1284; 680 pp->saved_state.mode = info->mode; 681 pp->saved_state.phase = info->phase; 682 info->mode = pp->state.mode; 683 info->phase = pp->state.phase; 684 compat_negot = 1; 685 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 686 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 687 compat_negot = 2; 688 } 689 if (compat_negot) { 690 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 691 printk (KERN_DEBUG CHRDEV 692 "%x: negotiated back to compatibility mode because " 693 "user-space forgot\n", minor); 694 } 695 696 if (pp->flags & PP_CLAIMED) { 697 struct ieee1284_info *info; 698 699 info = &pp->pdev->port->ieee1284; 700 pp->state.mode = info->mode; 701 pp->state.phase = info->phase; 702 info->mode = pp->saved_state.mode; 703 info->phase = pp->saved_state.phase; 704 parport_release (pp->pdev); 705 if (compat_negot != 1) { 706 printk (KERN_DEBUG CHRDEV "%x: released pardevice " 707 "because user-space forgot\n", minor); 708 } 709 } 710 711 if (pp->pdev) { 712 const char *name = pp->pdev->name; 713 parport_unregister_device (pp->pdev); 714 kfree (name); 715 pp->pdev = NULL; 716 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", 717 minor); 718 } 719 720 kfree (pp); 721 722 return 0; 723 } 724 725 /* No kernel lock held - fine */ 726 static unsigned int pp_poll (struct file * file, poll_table * wait) 727 { 728 struct pp_struct *pp = file->private_data; 729 unsigned int mask = 0; 730 731 poll_wait (file, &pp->irq_wait, wait); 732 if (atomic_read (&pp->irqc)) 733 mask |= POLLIN | POLLRDNORM; 734 735 return mask; 736 } 737 738 static struct class *ppdev_class; 739 740 static const struct file_operations pp_fops = { 741 .owner = THIS_MODULE, 742 .llseek = no_llseek, 743 .read = pp_read, 744 .write = pp_write, 745 .poll = pp_poll, 746 .ioctl = pp_ioctl, 747 .open = pp_open, 748 .release = pp_release, 749 }; 750 751 static void pp_attach(struct parport *port) 752 { 753 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 754 "parport%d", port->number); 755 } 756 757 static void pp_detach(struct parport *port) 758 { 759 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 760 } 761 762 static struct parport_driver pp_driver = { 763 .name = CHRDEV, 764 .attach = pp_attach, 765 .detach = pp_detach, 766 }; 767 768 static int __init ppdev_init (void) 769 { 770 int err = 0; 771 772 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { 773 printk (KERN_WARNING CHRDEV ": unable to get major %d\n", 774 PP_MAJOR); 775 return -EIO; 776 } 777 ppdev_class = class_create(THIS_MODULE, CHRDEV); 778 if (IS_ERR(ppdev_class)) { 779 err = PTR_ERR(ppdev_class); 780 goto out_chrdev; 781 } 782 if (parport_register_driver(&pp_driver)) { 783 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 784 goto out_class; 785 } 786 787 printk (KERN_INFO PP_VERSION "\n"); 788 goto out; 789 790 out_class: 791 class_destroy(ppdev_class); 792 out_chrdev: 793 unregister_chrdev(PP_MAJOR, CHRDEV); 794 out: 795 return err; 796 } 797 798 static void __exit ppdev_cleanup (void) 799 { 800 /* Clean up all parport stuff */ 801 parport_unregister_driver(&pp_driver); 802 class_destroy(ppdev_class); 803 unregister_chrdev (PP_MAJOR, CHRDEV); 804 } 805 806 module_init(ppdev_init); 807 module_exit(ppdev_cleanup); 808 809 MODULE_LICENSE("GPL"); 810 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 811