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/devfs_fs_kernel.h> 64 #include <linux/ioctl.h> 65 #include <linux/parport.h> 66 #include <linux/ctype.h> 67 #include <linux/poll.h> 68 #include <linux/major.h> 69 #include <linux/ppdev.h> 70 #include <linux/smp_lock.h> 71 #include <linux/device.h> 72 #include <asm/uaccess.h> 73 74 #define PP_VERSION "ppdev: user-space parallel port driver" 75 #define CHRDEV "ppdev" 76 77 struct pp_struct { 78 struct pardevice * pdev; 79 wait_queue_head_t irq_wait; 80 atomic_t irqc; 81 unsigned int flags; 82 int irqresponse; 83 unsigned char irqctl; 84 struct ieee1284_info state; 85 struct ieee1284_info saved_state; 86 long default_inactivity; 87 }; 88 89 /* pp_struct.flags bitfields */ 90 #define PP_CLAIMED (1<<0) 91 #define PP_EXCL (1<<1) 92 93 /* Other constants */ 94 #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ 95 #define PP_BUFFER_SIZE 1024 96 #define PARDEVICE_MAX 8 97 98 /* ROUND_UP macro from fs/select.c */ 99 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 100 101 static inline void pp_enable_irq (struct pp_struct *pp) 102 { 103 struct parport *port = pp->pdev->port; 104 port->ops->enable_irq (port); 105 } 106 107 static ssize_t pp_read (struct file * file, char __user * buf, size_t count, 108 loff_t * ppos) 109 { 110 unsigned int minor = iminor(file->f_dentry->d_inode); 111 struct pp_struct *pp = file->private_data; 112 char * kbuffer; 113 ssize_t bytes_read = 0; 114 struct parport *pport; 115 int mode; 116 117 if (!(pp->flags & PP_CLAIMED)) { 118 /* Don't have the port claimed */ 119 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 120 minor); 121 return -EINVAL; 122 } 123 124 /* Trivial case. */ 125 if (count == 0) 126 return 0; 127 128 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 129 if (!kbuffer) { 130 return -ENOMEM; 131 } 132 pport = pp->pdev->port; 133 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 134 135 parport_set_timeout (pp->pdev, 136 (file->f_flags & O_NONBLOCK) ? 137 PARPORT_INACTIVITY_O_NONBLOCK : 138 pp->default_inactivity); 139 140 while (bytes_read == 0) { 141 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 142 143 if (mode == IEEE1284_MODE_EPP) { 144 /* various specials for EPP mode */ 145 int flags = 0; 146 size_t (*fn)(struct parport *, void *, size_t, int); 147 148 if (pp->flags & PP_W91284PIC) { 149 flags |= PARPORT_W91284PIC; 150 } 151 if (pp->flags & PP_FASTREAD) { 152 flags |= PARPORT_EPP_FAST; 153 } 154 if (pport->ieee1284.mode & IEEE1284_ADDR) { 155 fn = pport->ops->epp_read_addr; 156 } else { 157 fn = pport->ops->epp_read_data; 158 } 159 bytes_read = (*fn)(pport, kbuffer, need, flags); 160 } else { 161 bytes_read = parport_read (pport, kbuffer, need); 162 } 163 164 if (bytes_read != 0) 165 break; 166 167 if (file->f_flags & O_NONBLOCK) { 168 bytes_read = -EAGAIN; 169 break; 170 } 171 172 if (signal_pending (current)) { 173 bytes_read = -ERESTARTSYS; 174 break; 175 } 176 177 cond_resched(); 178 } 179 180 parport_set_timeout (pp->pdev, pp->default_inactivity); 181 182 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) 183 bytes_read = -EFAULT; 184 185 kfree (kbuffer); 186 pp_enable_irq (pp); 187 return bytes_read; 188 } 189 190 static ssize_t pp_write (struct file * file, const char __user * buf, 191 size_t count, loff_t * ppos) 192 { 193 unsigned int minor = iminor(file->f_dentry->d_inode); 194 struct pp_struct *pp = file->private_data; 195 char * kbuffer; 196 ssize_t bytes_written = 0; 197 ssize_t wrote; 198 int mode; 199 struct parport *pport; 200 201 if (!(pp->flags & PP_CLAIMED)) { 202 /* Don't have the port claimed */ 203 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 204 minor); 205 return -EINVAL; 206 } 207 208 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 209 if (!kbuffer) { 210 return -ENOMEM; 211 } 212 pport = pp->pdev->port; 213 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 214 215 parport_set_timeout (pp->pdev, 216 (file->f_flags & O_NONBLOCK) ? 217 PARPORT_INACTIVITY_O_NONBLOCK : 218 pp->default_inactivity); 219 220 while (bytes_written < count) { 221 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 222 223 if (copy_from_user (kbuffer, buf + bytes_written, n)) { 224 bytes_written = -EFAULT; 225 break; 226 } 227 228 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 229 /* do a fast EPP write */ 230 if (pport->ieee1284.mode & IEEE1284_ADDR) { 231 wrote = pport->ops->epp_write_addr (pport, 232 kbuffer, n, PARPORT_EPP_FAST); 233 } else { 234 wrote = pport->ops->epp_write_data (pport, 235 kbuffer, n, PARPORT_EPP_FAST); 236 } 237 } else { 238 wrote = parport_write (pp->pdev->port, kbuffer, n); 239 } 240 241 if (wrote <= 0) { 242 if (!bytes_written) { 243 bytes_written = wrote; 244 } 245 break; 246 } 247 248 bytes_written += wrote; 249 250 if (file->f_flags & O_NONBLOCK) { 251 if (!bytes_written) 252 bytes_written = -EAGAIN; 253 break; 254 } 255 256 if (signal_pending (current)) { 257 if (!bytes_written) { 258 bytes_written = -EINTR; 259 } 260 break; 261 } 262 263 cond_resched(); 264 } 265 266 parport_set_timeout (pp->pdev, pp->default_inactivity); 267 268 kfree (kbuffer); 269 pp_enable_irq (pp); 270 return bytes_written; 271 } 272 273 static void pp_irq (int irq, void * private, struct pt_regs * unused) 274 { 275 struct pp_struct * pp = (struct pp_struct *) private; 276 277 if (pp->irqresponse) { 278 parport_write_control (pp->pdev->port, pp->irqctl); 279 pp->irqresponse = 0; 280 } 281 282 atomic_inc (&pp->irqc); 283 wake_up_interruptible (&pp->irq_wait); 284 } 285 286 static int register_device (int minor, struct pp_struct *pp) 287 { 288 struct parport *port; 289 struct pardevice * pdev = NULL; 290 char *name; 291 int fl; 292 293 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); 294 if (name == NULL) 295 return -ENOMEM; 296 297 sprintf (name, CHRDEV "%x", minor); 298 299 port = parport_find_number (minor); 300 if (!port) { 301 printk (KERN_WARNING "%s: no associated port!\n", name); 302 kfree (name); 303 return -ENXIO; 304 } 305 306 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 307 pdev = parport_register_device (port, name, NULL, 308 NULL, pp_irq, fl, pp); 309 parport_put_port (port); 310 311 if (!pdev) { 312 printk (KERN_WARNING "%s: failed to register device!\n", name); 313 kfree (name); 314 return -ENXIO; 315 } 316 317 pp->pdev = pdev; 318 printk (KERN_DEBUG "%s: registered pardevice\n", name); 319 return 0; 320 } 321 322 static enum ieee1284_phase init_phase (int mode) 323 { 324 switch (mode & ~(IEEE1284_DEVICEID 325 | IEEE1284_ADDR)) { 326 case IEEE1284_MODE_NIBBLE: 327 case IEEE1284_MODE_BYTE: 328 return IEEE1284_PH_REV_IDLE; 329 } 330 return IEEE1284_PH_FWD_IDLE; 331 } 332 333 static int pp_ioctl(struct inode *inode, struct file *file, 334 unsigned int cmd, unsigned long arg) 335 { 336 unsigned int minor = iminor(inode); 337 struct pp_struct *pp = file->private_data; 338 struct parport * port; 339 void __user *argp = (void __user *)arg; 340 341 /* First handle the cases that don't take arguments. */ 342 switch (cmd) { 343 case PPCLAIM: 344 { 345 struct ieee1284_info *info; 346 int ret; 347 348 if (pp->flags & PP_CLAIMED) { 349 printk (KERN_DEBUG CHRDEV 350 "%x: you've already got it!\n", minor); 351 return -EINVAL; 352 } 353 354 /* Deferred device registration. */ 355 if (!pp->pdev) { 356 int err = register_device (minor, pp); 357 if (err) { 358 return err; 359 } 360 } 361 362 ret = parport_claim_or_block (pp->pdev); 363 if (ret < 0) 364 return ret; 365 366 pp->flags |= PP_CLAIMED; 367 368 /* For interrupt-reporting to work, we need to be 369 * informed of each interrupt. */ 370 pp_enable_irq (pp); 371 372 /* We may need to fix up the state machine. */ 373 info = &pp->pdev->port->ieee1284; 374 pp->saved_state.mode = info->mode; 375 pp->saved_state.phase = info->phase; 376 info->mode = pp->state.mode; 377 info->phase = pp->state.phase; 378 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 379 parport_set_timeout (pp->pdev, pp->default_inactivity); 380 381 return 0; 382 } 383 case PPEXCL: 384 if (pp->pdev) { 385 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " 386 "already registered\n", minor); 387 if (pp->flags & PP_EXCL) 388 /* But it's not really an error. */ 389 return 0; 390 /* There's no chance of making the driver happy. */ 391 return -EINVAL; 392 } 393 394 /* Just remember to register the device exclusively 395 * when we finally do the registration. */ 396 pp->flags |= PP_EXCL; 397 return 0; 398 case PPSETMODE: 399 { 400 int mode; 401 if (copy_from_user (&mode, argp, sizeof (mode))) 402 return -EFAULT; 403 /* FIXME: validate mode */ 404 pp->state.mode = mode; 405 pp->state.phase = init_phase (mode); 406 407 if (pp->flags & PP_CLAIMED) { 408 pp->pdev->port->ieee1284.mode = mode; 409 pp->pdev->port->ieee1284.phase = pp->state.phase; 410 } 411 412 return 0; 413 } 414 case PPGETMODE: 415 { 416 int mode; 417 418 if (pp->flags & PP_CLAIMED) { 419 mode = pp->pdev->port->ieee1284.mode; 420 } else { 421 mode = pp->state.mode; 422 } 423 if (copy_to_user (argp, &mode, sizeof (mode))) { 424 return -EFAULT; 425 } 426 return 0; 427 } 428 case PPSETPHASE: 429 { 430 int phase; 431 if (copy_from_user (&phase, argp, sizeof (phase))) { 432 return -EFAULT; 433 } 434 /* FIXME: validate phase */ 435 pp->state.phase = phase; 436 437 if (pp->flags & PP_CLAIMED) { 438 pp->pdev->port->ieee1284.phase = phase; 439 } 440 441 return 0; 442 } 443 case PPGETPHASE: 444 { 445 int phase; 446 447 if (pp->flags & PP_CLAIMED) { 448 phase = pp->pdev->port->ieee1284.phase; 449 } else { 450 phase = pp->state.phase; 451 } 452 if (copy_to_user (argp, &phase, sizeof (phase))) { 453 return -EFAULT; 454 } 455 return 0; 456 } 457 case PPGETMODES: 458 { 459 unsigned int modes; 460 461 port = parport_find_number (minor); 462 if (!port) 463 return -ENODEV; 464 465 modes = port->modes; 466 if (copy_to_user (argp, &modes, sizeof (modes))) { 467 return -EFAULT; 468 } 469 return 0; 470 } 471 case PPSETFLAGS: 472 { 473 int uflags; 474 475 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 476 return -EFAULT; 477 } 478 pp->flags &= ~PP_FLAGMASK; 479 pp->flags |= (uflags & PP_FLAGMASK); 480 return 0; 481 } 482 case PPGETFLAGS: 483 { 484 int uflags; 485 486 uflags = pp->flags & PP_FLAGMASK; 487 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 488 return -EFAULT; 489 } 490 return 0; 491 } 492 } /* end switch() */ 493 494 /* Everything else requires the port to be claimed, so check 495 * that now. */ 496 if ((pp->flags & PP_CLAIMED) == 0) { 497 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 498 minor); 499 return -EINVAL; 500 } 501 502 port = pp->pdev->port; 503 switch (cmd) { 504 struct ieee1284_info *info; 505 unsigned char reg; 506 unsigned char mask; 507 int mode; 508 int ret; 509 struct timeval par_timeout; 510 long to_jiffies; 511 512 case PPRSTATUS: 513 reg = parport_read_status (port); 514 if (copy_to_user (argp, ®, sizeof (reg))) 515 return -EFAULT; 516 return 0; 517 case PPRDATA: 518 reg = parport_read_data (port); 519 if (copy_to_user (argp, ®, sizeof (reg))) 520 return -EFAULT; 521 return 0; 522 case PPRCONTROL: 523 reg = parport_read_control (port); 524 if (copy_to_user (argp, ®, sizeof (reg))) 525 return -EFAULT; 526 return 0; 527 case PPYIELD: 528 parport_yield_blocking (pp->pdev); 529 return 0; 530 531 case PPRELEASE: 532 /* Save the state machine's state. */ 533 info = &pp->pdev->port->ieee1284; 534 pp->state.mode = info->mode; 535 pp->state.phase = info->phase; 536 info->mode = pp->saved_state.mode; 537 info->phase = pp->saved_state.phase; 538 parport_release (pp->pdev); 539 pp->flags &= ~PP_CLAIMED; 540 return 0; 541 542 case PPWCONTROL: 543 if (copy_from_user (®, argp, sizeof (reg))) 544 return -EFAULT; 545 parport_write_control (port, reg); 546 return 0; 547 548 case PPWDATA: 549 if (copy_from_user (®, argp, sizeof (reg))) 550 return -EFAULT; 551 parport_write_data (port, reg); 552 return 0; 553 554 case PPFCONTROL: 555 if (copy_from_user (&mask, argp, 556 sizeof (mask))) 557 return -EFAULT; 558 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 559 sizeof (reg))) 560 return -EFAULT; 561 parport_frob_control (port, mask, reg); 562 return 0; 563 564 case PPDATADIR: 565 if (copy_from_user (&mode, argp, sizeof (mode))) 566 return -EFAULT; 567 if (mode) 568 port->ops->data_reverse (port); 569 else 570 port->ops->data_forward (port); 571 return 0; 572 573 case PPNEGOT: 574 if (copy_from_user (&mode, argp, sizeof (mode))) 575 return -EFAULT; 576 switch ((ret = parport_negotiate (port, mode))) { 577 case 0: break; 578 case -1: /* handshake failed, peripheral not IEEE 1284 */ 579 ret = -EIO; 580 break; 581 case 1: /* handshake succeeded, peripheral rejected mode */ 582 ret = -ENXIO; 583 break; 584 } 585 pp_enable_irq (pp); 586 return ret; 587 588 case PPWCTLONIRQ: 589 if (copy_from_user (®, argp, sizeof (reg))) 590 return -EFAULT; 591 592 /* Remember what to set the control lines to, for next 593 * time we get an interrupt. */ 594 pp->irqctl = reg; 595 pp->irqresponse = 1; 596 return 0; 597 598 case PPCLRIRQ: 599 ret = atomic_read (&pp->irqc); 600 if (copy_to_user (argp, &ret, sizeof (ret))) 601 return -EFAULT; 602 atomic_sub (ret, &pp->irqc); 603 return 0; 604 605 case PPSETTIME: 606 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 607 return -EFAULT; 608 } 609 /* Convert to jiffies, place in pp->pdev->timeout */ 610 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 611 return -EINVAL; 612 } 613 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 614 to_jiffies += par_timeout.tv_sec * (long)HZ; 615 if (to_jiffies <= 0) { 616 return -EINVAL; 617 } 618 pp->pdev->timeout = to_jiffies; 619 return 0; 620 621 case PPGETTIME: 622 to_jiffies = pp->pdev->timeout; 623 par_timeout.tv_sec = to_jiffies / HZ; 624 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 625 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 626 return -EFAULT; 627 return 0; 628 629 default: 630 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, 631 cmd); 632 return -EINVAL; 633 } 634 635 /* Keep the compiler happy */ 636 return 0; 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 if (minor >= PARPORT_MAX) 645 return -ENXIO; 646 647 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 648 if (!pp) 649 return -ENOMEM; 650 651 pp->state.mode = IEEE1284_MODE_COMPAT; 652 pp->state.phase = init_phase (pp->state.mode); 653 pp->flags = 0; 654 pp->irqresponse = 0; 655 atomic_set (&pp->irqc, 0); 656 init_waitqueue_head (&pp->irq_wait); 657 658 /* Defer the actual device registration until the first claim. 659 * That way, we know whether or not the driver wants to have 660 * exclusive access to the port (PPEXCL). 661 */ 662 pp->pdev = NULL; 663 file->private_data = pp; 664 665 return 0; 666 } 667 668 static int pp_release (struct inode * inode, struct file * file) 669 { 670 unsigned int minor = iminor(inode); 671 struct pp_struct *pp = file->private_data; 672 int compat_negot; 673 674 compat_negot = 0; 675 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 676 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 677 struct ieee1284_info *info; 678 679 /* parport released, but not in compatibility mode */ 680 parport_claim_or_block (pp->pdev); 681 pp->flags |= PP_CLAIMED; 682 info = &pp->pdev->port->ieee1284; 683 pp->saved_state.mode = info->mode; 684 pp->saved_state.phase = info->phase; 685 info->mode = pp->state.mode; 686 info->phase = pp->state.phase; 687 compat_negot = 1; 688 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 689 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 690 compat_negot = 2; 691 } 692 if (compat_negot) { 693 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 694 printk (KERN_DEBUG CHRDEV 695 "%x: negotiated back to compatibility mode because " 696 "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 printk (KERN_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 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", 720 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 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 .ioctl = pp_ioctl, 750 .open = pp_open, 751 .release = pp_release, 752 }; 753 754 static void pp_attach(struct parport *port) 755 { 756 class_device_create(ppdev_class, NULL, MKDEV(PP_MAJOR, port->number), 757 NULL, "parport%d", port->number); 758 } 759 760 static void pp_detach(struct parport *port) 761 { 762 class_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 i, 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 devfs_mk_dir("parports"); 786 for (i = 0; i < PARPORT_MAX; i++) { 787 devfs_mk_cdev(MKDEV(PP_MAJOR, i), 788 S_IFCHR | S_IRUGO | S_IWUGO, "parports/%d", i); 789 } 790 if (parport_register_driver(&pp_driver)) { 791 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 792 goto out_class; 793 } 794 795 printk (KERN_INFO PP_VERSION "\n"); 796 goto out; 797 798 out_class: 799 for (i = 0; i < PARPORT_MAX; i++) 800 devfs_remove("parports/%d", i); 801 devfs_remove("parports"); 802 class_destroy(ppdev_class); 803 out_chrdev: 804 unregister_chrdev(PP_MAJOR, CHRDEV); 805 out: 806 return err; 807 } 808 809 static void __exit ppdev_cleanup (void) 810 { 811 int i; 812 /* Clean up all parport stuff */ 813 for (i = 0; i < PARPORT_MAX; i++) 814 devfs_remove("parports/%d", i); 815 parport_unregister_driver(&pp_driver); 816 devfs_remove("parports"); 817 class_destroy(ppdev_class); 818 unregister_chrdev (PP_MAJOR, CHRDEV); 819 } 820 821 module_init(ppdev_init); 822 module_exit(ppdev_cleanup); 823 824 MODULE_LICENSE("GPL"); 825 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 826