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 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 (void *private) 272 { 273 struct pp_struct *pp = 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_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 332 { 333 unsigned int minor = iminor(file->f_path.dentry->d_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 long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 637 { 638 long ret; 639 lock_kernel(); 640 ret = pp_do_ioctl(file, cmd, arg); 641 unlock_kernel(); 642 return ret; 643 } 644 645 static int pp_open (struct inode * inode, struct file * file) 646 { 647 unsigned int minor = iminor(inode); 648 struct pp_struct *pp; 649 650 cycle_kernel_lock(); 651 if (minor >= PARPORT_MAX) 652 return -ENXIO; 653 654 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 655 if (!pp) 656 return -ENOMEM; 657 658 pp->state.mode = IEEE1284_MODE_COMPAT; 659 pp->state.phase = init_phase (pp->state.mode); 660 pp->flags = 0; 661 pp->irqresponse = 0; 662 atomic_set (&pp->irqc, 0); 663 init_waitqueue_head (&pp->irq_wait); 664 665 /* Defer the actual device registration until the first claim. 666 * That way, we know whether or not the driver wants to have 667 * exclusive access to the port (PPEXCL). 668 */ 669 pp->pdev = NULL; 670 file->private_data = pp; 671 672 return 0; 673 } 674 675 static int pp_release (struct inode * inode, struct file * file) 676 { 677 unsigned int minor = iminor(inode); 678 struct pp_struct *pp = file->private_data; 679 int compat_negot; 680 681 compat_negot = 0; 682 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 683 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 684 struct ieee1284_info *info; 685 686 /* parport released, but not in compatibility mode */ 687 parport_claim_or_block (pp->pdev); 688 pp->flags |= PP_CLAIMED; 689 info = &pp->pdev->port->ieee1284; 690 pp->saved_state.mode = info->mode; 691 pp->saved_state.phase = info->phase; 692 info->mode = pp->state.mode; 693 info->phase = pp->state.phase; 694 compat_negot = 1; 695 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 696 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 697 compat_negot = 2; 698 } 699 if (compat_negot) { 700 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 701 printk (KERN_DEBUG CHRDEV 702 "%x: negotiated back to compatibility mode because " 703 "user-space forgot\n", minor); 704 } 705 706 if (pp->flags & PP_CLAIMED) { 707 struct ieee1284_info *info; 708 709 info = &pp->pdev->port->ieee1284; 710 pp->state.mode = info->mode; 711 pp->state.phase = info->phase; 712 info->mode = pp->saved_state.mode; 713 info->phase = pp->saved_state.phase; 714 parport_release (pp->pdev); 715 if (compat_negot != 1) { 716 printk (KERN_DEBUG CHRDEV "%x: released pardevice " 717 "because user-space forgot\n", minor); 718 } 719 } 720 721 if (pp->pdev) { 722 const char *name = pp->pdev->name; 723 parport_unregister_device (pp->pdev); 724 kfree (name); 725 pp->pdev = NULL; 726 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", 727 minor); 728 } 729 730 kfree (pp); 731 732 return 0; 733 } 734 735 /* No kernel lock held - fine */ 736 static unsigned int pp_poll (struct file * file, poll_table * wait) 737 { 738 struct pp_struct *pp = file->private_data; 739 unsigned int mask = 0; 740 741 poll_wait (file, &pp->irq_wait, wait); 742 if (atomic_read (&pp->irqc)) 743 mask |= POLLIN | POLLRDNORM; 744 745 return mask; 746 } 747 748 static struct class *ppdev_class; 749 750 static const struct file_operations pp_fops = { 751 .owner = THIS_MODULE, 752 .llseek = no_llseek, 753 .read = pp_read, 754 .write = pp_write, 755 .poll = pp_poll, 756 .unlocked_ioctl = pp_ioctl, 757 .open = pp_open, 758 .release = pp_release, 759 }; 760 761 static void pp_attach(struct parport *port) 762 { 763 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 764 NULL, "parport%d", port->number); 765 } 766 767 static void pp_detach(struct parport *port) 768 { 769 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 770 } 771 772 static struct parport_driver pp_driver = { 773 .name = CHRDEV, 774 .attach = pp_attach, 775 .detach = pp_detach, 776 }; 777 778 static int __init ppdev_init (void) 779 { 780 int err = 0; 781 782 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { 783 printk (KERN_WARNING CHRDEV ": unable to get major %d\n", 784 PP_MAJOR); 785 return -EIO; 786 } 787 ppdev_class = class_create(THIS_MODULE, CHRDEV); 788 if (IS_ERR(ppdev_class)) { 789 err = PTR_ERR(ppdev_class); 790 goto out_chrdev; 791 } 792 if (parport_register_driver(&pp_driver)) { 793 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 794 goto out_class; 795 } 796 797 printk (KERN_INFO PP_VERSION "\n"); 798 goto out; 799 800 out_class: 801 class_destroy(ppdev_class); 802 out_chrdev: 803 unregister_chrdev(PP_MAJOR, CHRDEV); 804 out: 805 return err; 806 } 807 808 static void __exit ppdev_cleanup (void) 809 { 810 /* Clean up all parport stuff */ 811 parport_unregister_driver(&pp_driver); 812 class_destroy(ppdev_class); 813 unregister_chrdev (PP_MAJOR, CHRDEV); 814 } 815 816 module_init(ppdev_init); 817 module_exit(ppdev_cleanup); 818 819 MODULE_LICENSE("GPL"); 820 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 821