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 = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 291 if (name == NULL) 292 return -ENOMEM; 293 294 port = parport_find_number (minor); 295 if (!port) { 296 printk (KERN_WARNING "%s: no associated port!\n", name); 297 kfree (name); 298 return -ENXIO; 299 } 300 301 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 302 pdev = parport_register_device (port, name, NULL, 303 NULL, pp_irq, fl, pp); 304 parport_put_port (port); 305 306 if (!pdev) { 307 printk (KERN_WARNING "%s: failed to register device!\n", name); 308 kfree (name); 309 return -ENXIO; 310 } 311 312 pp->pdev = pdev; 313 pr_debug("%s: registered pardevice\n", name); 314 return 0; 315 } 316 317 static enum ieee1284_phase init_phase (int mode) 318 { 319 switch (mode & ~(IEEE1284_DEVICEID 320 | IEEE1284_ADDR)) { 321 case IEEE1284_MODE_NIBBLE: 322 case IEEE1284_MODE_BYTE: 323 return IEEE1284_PH_REV_IDLE; 324 } 325 return IEEE1284_PH_FWD_IDLE; 326 } 327 328 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 329 { 330 unsigned int minor = iminor(file->f_path.dentry->d_inode); 331 struct pp_struct *pp = file->private_data; 332 struct parport * port; 333 void __user *argp = (void __user *)arg; 334 335 /* First handle the cases that don't take arguments. */ 336 switch (cmd) { 337 case PPCLAIM: 338 { 339 struct ieee1284_info *info; 340 int ret; 341 342 if (pp->flags & PP_CLAIMED) { 343 pr_debug(CHRDEV "%x: you've already got it!\n", minor); 344 return -EINVAL; 345 } 346 347 /* Deferred device registration. */ 348 if (!pp->pdev) { 349 int err = register_device (minor, pp); 350 if (err) { 351 return err; 352 } 353 } 354 355 ret = parport_claim_or_block (pp->pdev); 356 if (ret < 0) 357 return ret; 358 359 pp->flags |= PP_CLAIMED; 360 361 /* For interrupt-reporting to work, we need to be 362 * informed of each interrupt. */ 363 pp_enable_irq (pp); 364 365 /* We may need to fix up the state machine. */ 366 info = &pp->pdev->port->ieee1284; 367 pp->saved_state.mode = info->mode; 368 pp->saved_state.phase = info->phase; 369 info->mode = pp->state.mode; 370 info->phase = pp->state.phase; 371 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 372 parport_set_timeout (pp->pdev, pp->default_inactivity); 373 374 return 0; 375 } 376 case PPEXCL: 377 if (pp->pdev) { 378 pr_debug(CHRDEV "%x: too late for PPEXCL; " 379 "already registered\n", minor); 380 if (pp->flags & PP_EXCL) 381 /* But it's not really an error. */ 382 return 0; 383 /* There's no chance of making the driver happy. */ 384 return -EINVAL; 385 } 386 387 /* Just remember to register the device exclusively 388 * when we finally do the registration. */ 389 pp->flags |= PP_EXCL; 390 return 0; 391 case PPSETMODE: 392 { 393 int mode; 394 if (copy_from_user (&mode, argp, sizeof (mode))) 395 return -EFAULT; 396 /* FIXME: validate mode */ 397 pp->state.mode = mode; 398 pp->state.phase = init_phase (mode); 399 400 if (pp->flags & PP_CLAIMED) { 401 pp->pdev->port->ieee1284.mode = mode; 402 pp->pdev->port->ieee1284.phase = pp->state.phase; 403 } 404 405 return 0; 406 } 407 case PPGETMODE: 408 { 409 int mode; 410 411 if (pp->flags & PP_CLAIMED) { 412 mode = pp->pdev->port->ieee1284.mode; 413 } else { 414 mode = pp->state.mode; 415 } 416 if (copy_to_user (argp, &mode, sizeof (mode))) { 417 return -EFAULT; 418 } 419 return 0; 420 } 421 case PPSETPHASE: 422 { 423 int phase; 424 if (copy_from_user (&phase, argp, sizeof (phase))) { 425 return -EFAULT; 426 } 427 /* FIXME: validate phase */ 428 pp->state.phase = phase; 429 430 if (pp->flags & PP_CLAIMED) { 431 pp->pdev->port->ieee1284.phase = phase; 432 } 433 434 return 0; 435 } 436 case PPGETPHASE: 437 { 438 int phase; 439 440 if (pp->flags & PP_CLAIMED) { 441 phase = pp->pdev->port->ieee1284.phase; 442 } else { 443 phase = pp->state.phase; 444 } 445 if (copy_to_user (argp, &phase, sizeof (phase))) { 446 return -EFAULT; 447 } 448 return 0; 449 } 450 case PPGETMODES: 451 { 452 unsigned int modes; 453 454 port = parport_find_number (minor); 455 if (!port) 456 return -ENODEV; 457 458 modes = port->modes; 459 if (copy_to_user (argp, &modes, sizeof (modes))) { 460 return -EFAULT; 461 } 462 return 0; 463 } 464 case PPSETFLAGS: 465 { 466 int uflags; 467 468 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 469 return -EFAULT; 470 } 471 pp->flags &= ~PP_FLAGMASK; 472 pp->flags |= (uflags & PP_FLAGMASK); 473 return 0; 474 } 475 case PPGETFLAGS: 476 { 477 int uflags; 478 479 uflags = pp->flags & PP_FLAGMASK; 480 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 481 return -EFAULT; 482 } 483 return 0; 484 } 485 } /* end switch() */ 486 487 /* Everything else requires the port to be claimed, so check 488 * that now. */ 489 if ((pp->flags & PP_CLAIMED) == 0) { 490 pr_debug(CHRDEV "%x: claim the port first\n", minor); 491 return -EINVAL; 492 } 493 494 port = pp->pdev->port; 495 switch (cmd) { 496 struct ieee1284_info *info; 497 unsigned char reg; 498 unsigned char mask; 499 int mode; 500 int ret; 501 struct timeval par_timeout; 502 long to_jiffies; 503 504 case PPRSTATUS: 505 reg = parport_read_status (port); 506 if (copy_to_user (argp, ®, sizeof (reg))) 507 return -EFAULT; 508 return 0; 509 case PPRDATA: 510 reg = parport_read_data (port); 511 if (copy_to_user (argp, ®, sizeof (reg))) 512 return -EFAULT; 513 return 0; 514 case PPRCONTROL: 515 reg = parport_read_control (port); 516 if (copy_to_user (argp, ®, sizeof (reg))) 517 return -EFAULT; 518 return 0; 519 case PPYIELD: 520 parport_yield_blocking (pp->pdev); 521 return 0; 522 523 case PPRELEASE: 524 /* Save the state machine's state. */ 525 info = &pp->pdev->port->ieee1284; 526 pp->state.mode = info->mode; 527 pp->state.phase = info->phase; 528 info->mode = pp->saved_state.mode; 529 info->phase = pp->saved_state.phase; 530 parport_release (pp->pdev); 531 pp->flags &= ~PP_CLAIMED; 532 return 0; 533 534 case PPWCONTROL: 535 if (copy_from_user (®, argp, sizeof (reg))) 536 return -EFAULT; 537 parport_write_control (port, reg); 538 return 0; 539 540 case PPWDATA: 541 if (copy_from_user (®, argp, sizeof (reg))) 542 return -EFAULT; 543 parport_write_data (port, reg); 544 return 0; 545 546 case PPFCONTROL: 547 if (copy_from_user (&mask, argp, 548 sizeof (mask))) 549 return -EFAULT; 550 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 551 sizeof (reg))) 552 return -EFAULT; 553 parport_frob_control (port, mask, reg); 554 return 0; 555 556 case PPDATADIR: 557 if (copy_from_user (&mode, argp, sizeof (mode))) 558 return -EFAULT; 559 if (mode) 560 port->ops->data_reverse (port); 561 else 562 port->ops->data_forward (port); 563 return 0; 564 565 case PPNEGOT: 566 if (copy_from_user (&mode, argp, sizeof (mode))) 567 return -EFAULT; 568 switch ((ret = parport_negotiate (port, mode))) { 569 case 0: break; 570 case -1: /* handshake failed, peripheral not IEEE 1284 */ 571 ret = -EIO; 572 break; 573 case 1: /* handshake succeeded, peripheral rejected mode */ 574 ret = -ENXIO; 575 break; 576 } 577 pp_enable_irq (pp); 578 return ret; 579 580 case PPWCTLONIRQ: 581 if (copy_from_user (®, argp, sizeof (reg))) 582 return -EFAULT; 583 584 /* Remember what to set the control lines to, for next 585 * time we get an interrupt. */ 586 pp->irqctl = reg; 587 pp->irqresponse = 1; 588 return 0; 589 590 case PPCLRIRQ: 591 ret = atomic_read (&pp->irqc); 592 if (copy_to_user (argp, &ret, sizeof (ret))) 593 return -EFAULT; 594 atomic_sub (ret, &pp->irqc); 595 return 0; 596 597 case PPSETTIME: 598 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 599 return -EFAULT; 600 } 601 /* Convert to jiffies, place in pp->pdev->timeout */ 602 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 603 return -EINVAL; 604 } 605 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 606 to_jiffies += par_timeout.tv_sec * (long)HZ; 607 if (to_jiffies <= 0) { 608 return -EINVAL; 609 } 610 pp->pdev->timeout = to_jiffies; 611 return 0; 612 613 case PPGETTIME: 614 to_jiffies = pp->pdev->timeout; 615 par_timeout.tv_sec = to_jiffies / HZ; 616 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 617 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 618 return -EFAULT; 619 return 0; 620 621 default: 622 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); 623 return -EINVAL; 624 } 625 626 /* Keep the compiler happy */ 627 return 0; 628 } 629 630 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 631 { 632 long ret; 633 lock_kernel(); 634 ret = pp_do_ioctl(file, cmd, arg); 635 unlock_kernel(); 636 return ret; 637 } 638 639 static int pp_open (struct inode * inode, struct file * file) 640 { 641 unsigned int minor = iminor(inode); 642 struct pp_struct *pp; 643 644 cycle_kernel_lock(); 645 if (minor >= PARPORT_MAX) 646 return -ENXIO; 647 648 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 649 if (!pp) 650 return -ENOMEM; 651 652 pp->state.mode = IEEE1284_MODE_COMPAT; 653 pp->state.phase = init_phase (pp->state.mode); 654 pp->flags = 0; 655 pp->irqresponse = 0; 656 atomic_set (&pp->irqc, 0); 657 init_waitqueue_head (&pp->irq_wait); 658 659 /* Defer the actual device registration until the first claim. 660 * That way, we know whether or not the driver wants to have 661 * exclusive access to the port (PPEXCL). 662 */ 663 pp->pdev = NULL; 664 file->private_data = pp; 665 666 return 0; 667 } 668 669 static int pp_release (struct inode * inode, struct file * file) 670 { 671 unsigned int minor = iminor(inode); 672 struct pp_struct *pp = file->private_data; 673 int compat_negot; 674 675 compat_negot = 0; 676 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 677 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 678 struct ieee1284_info *info; 679 680 /* parport released, but not in compatibility mode */ 681 parport_claim_or_block (pp->pdev); 682 pp->flags |= PP_CLAIMED; 683 info = &pp->pdev->port->ieee1284; 684 pp->saved_state.mode = info->mode; 685 pp->saved_state.phase = info->phase; 686 info->mode = pp->state.mode; 687 info->phase = pp->state.phase; 688 compat_negot = 1; 689 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 690 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 691 compat_negot = 2; 692 } 693 if (compat_negot) { 694 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 695 pr_debug(CHRDEV "%x: negotiated back to compatibility " 696 "mode because user-space forgot\n", minor); 697 } 698 699 if (pp->flags & PP_CLAIMED) { 700 struct ieee1284_info *info; 701 702 info = &pp->pdev->port->ieee1284; 703 pp->state.mode = info->mode; 704 pp->state.phase = info->phase; 705 info->mode = pp->saved_state.mode; 706 info->phase = pp->saved_state.phase; 707 parport_release (pp->pdev); 708 if (compat_negot != 1) { 709 pr_debug(CHRDEV "%x: released pardevice " 710 "because user-space forgot\n", minor); 711 } 712 } 713 714 if (pp->pdev) { 715 const char *name = pp->pdev->name; 716 parport_unregister_device (pp->pdev); 717 kfree (name); 718 pp->pdev = NULL; 719 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 720 } 721 722 kfree (pp); 723 724 return 0; 725 } 726 727 /* No kernel lock held - fine */ 728 static unsigned int pp_poll (struct file * file, poll_table * wait) 729 { 730 struct pp_struct *pp = file->private_data; 731 unsigned int mask = 0; 732 733 poll_wait (file, &pp->irq_wait, wait); 734 if (atomic_read (&pp->irqc)) 735 mask |= POLLIN | POLLRDNORM; 736 737 return mask; 738 } 739 740 static struct class *ppdev_class; 741 742 static const struct file_operations pp_fops = { 743 .owner = THIS_MODULE, 744 .llseek = no_llseek, 745 .read = pp_read, 746 .write = pp_write, 747 .poll = pp_poll, 748 .unlocked_ioctl = pp_ioctl, 749 .open = pp_open, 750 .release = pp_release, 751 }; 752 753 static void pp_attach(struct parport *port) 754 { 755 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 756 NULL, "parport%d", port->number); 757 } 758 759 static void pp_detach(struct parport *port) 760 { 761 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 762 } 763 764 static struct parport_driver pp_driver = { 765 .name = CHRDEV, 766 .attach = pp_attach, 767 .detach = pp_detach, 768 }; 769 770 static int __init ppdev_init (void) 771 { 772 int err = 0; 773 774 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { 775 printk (KERN_WARNING CHRDEV ": unable to get major %d\n", 776 PP_MAJOR); 777 return -EIO; 778 } 779 ppdev_class = class_create(THIS_MODULE, CHRDEV); 780 if (IS_ERR(ppdev_class)) { 781 err = PTR_ERR(ppdev_class); 782 goto out_chrdev; 783 } 784 if (parport_register_driver(&pp_driver)) { 785 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 786 goto out_class; 787 } 788 789 printk (KERN_INFO PP_VERSION "\n"); 790 goto out; 791 792 out_class: 793 class_destroy(ppdev_class); 794 out_chrdev: 795 unregister_chrdev(PP_MAJOR, CHRDEV); 796 out: 797 return err; 798 } 799 800 static void __exit ppdev_cleanup (void) 801 { 802 /* Clean up all parport stuff */ 803 parport_unregister_driver(&pp_driver); 804 class_destroy(ppdev_class); 805 unregister_chrdev (PP_MAJOR, CHRDEV); 806 } 807 808 module_init(ppdev_init); 809 module_exit(ppdev_cleanup); 810 811 MODULE_LICENSE("GPL"); 812 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 813