ppdev.c revision ca8eca6884861c1ce294b05aacfdf9045bba9aff
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 <asm/uaccess.h> 69#include <linux/ppdev.h> 70#include <linux/smp_lock.h> 71#include <linux/device.h> 72 73#define PP_VERSION "ppdev: user-space parallel port driver" 74#define CHRDEV "ppdev" 75 76struct 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 100static 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 106static 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_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 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 119 minor); 120 return -EINVAL; 121 } 122 123 /* Trivial case. */ 124 if (count == 0) 125 return 0; 126 127 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 128 if (!kbuffer) { 129 return -ENOMEM; 130 } 131 pport = pp->pdev->port; 132 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 133 134 parport_set_timeout (pp->pdev, 135 (file->f_flags & O_NONBLOCK) ? 136 PARPORT_INACTIVITY_O_NONBLOCK : 137 pp->default_inactivity); 138 139 while (bytes_read == 0) { 140 ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); 141 142 if (mode == IEEE1284_MODE_EPP) { 143 /* various specials for EPP mode */ 144 int flags = 0; 145 size_t (*fn)(struct parport *, void *, size_t, int); 146 147 if (pp->flags & PP_W91284PIC) { 148 flags |= PARPORT_W91284PIC; 149 } 150 if (pp->flags & PP_FASTREAD) { 151 flags |= PARPORT_EPP_FAST; 152 } 153 if (pport->ieee1284.mode & IEEE1284_ADDR) { 154 fn = pport->ops->epp_read_addr; 155 } else { 156 fn = pport->ops->epp_read_data; 157 } 158 bytes_read = (*fn)(pport, kbuffer, need, flags); 159 } else { 160 bytes_read = parport_read (pport, kbuffer, need); 161 } 162 163 if (bytes_read != 0) 164 break; 165 166 if (file->f_flags & O_NONBLOCK) { 167 bytes_read = -EAGAIN; 168 break; 169 } 170 171 if (signal_pending (current)) { 172 bytes_read = -ERESTARTSYS; 173 break; 174 } 175 176 cond_resched(); 177 } 178 179 parport_set_timeout (pp->pdev, pp->default_inactivity); 180 181 if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read)) 182 bytes_read = -EFAULT; 183 184 kfree (kbuffer); 185 pp_enable_irq (pp); 186 return bytes_read; 187} 188 189static ssize_t pp_write (struct file * file, const char __user * buf, 190 size_t count, loff_t * ppos) 191{ 192 unsigned int minor = iminor(file->f_dentry->d_inode); 193 struct pp_struct *pp = file->private_data; 194 char * kbuffer; 195 ssize_t bytes_written = 0; 196 ssize_t wrote; 197 int mode; 198 struct parport *pport; 199 200 if (!(pp->flags & PP_CLAIMED)) { 201 /* Don't have the port claimed */ 202 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 203 minor); 204 return -EINVAL; 205 } 206 207 kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); 208 if (!kbuffer) { 209 return -ENOMEM; 210 } 211 pport = pp->pdev->port; 212 mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); 213 214 parport_set_timeout (pp->pdev, 215 (file->f_flags & O_NONBLOCK) ? 216 PARPORT_INACTIVITY_O_NONBLOCK : 217 pp->default_inactivity); 218 219 while (bytes_written < count) { 220 ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); 221 222 if (copy_from_user (kbuffer, buf + bytes_written, n)) { 223 bytes_written = -EFAULT; 224 break; 225 } 226 227 if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { 228 /* do a fast EPP write */ 229 if (pport->ieee1284.mode & IEEE1284_ADDR) { 230 wrote = pport->ops->epp_write_addr (pport, 231 kbuffer, n, PARPORT_EPP_FAST); 232 } else { 233 wrote = pport->ops->epp_write_data (pport, 234 kbuffer, n, PARPORT_EPP_FAST); 235 } 236 } else { 237 wrote = parport_write (pp->pdev->port, kbuffer, n); 238 } 239 240 if (wrote <= 0) { 241 if (!bytes_written) { 242 bytes_written = wrote; 243 } 244 break; 245 } 246 247 bytes_written += wrote; 248 249 if (file->f_flags & O_NONBLOCK) { 250 if (!bytes_written) 251 bytes_written = -EAGAIN; 252 break; 253 } 254 255 if (signal_pending (current)) { 256 if (!bytes_written) { 257 bytes_written = -EINTR; 258 } 259 break; 260 } 261 262 cond_resched(); 263 } 264 265 parport_set_timeout (pp->pdev, pp->default_inactivity); 266 267 kfree (kbuffer); 268 pp_enable_irq (pp); 269 return bytes_written; 270} 271 272static void pp_irq (int irq, void * private, struct pt_regs * unused) 273{ 274 struct pp_struct * pp = (struct pp_struct *) private; 275 276 if (pp->irqresponse) { 277 parport_write_control (pp->pdev->port, pp->irqctl); 278 pp->irqresponse = 0; 279 } 280 281 atomic_inc (&pp->irqc); 282 wake_up_interruptible (&pp->irq_wait); 283} 284 285static int register_device (int minor, struct pp_struct *pp) 286{ 287 struct parport *port; 288 struct pardevice * pdev = NULL; 289 char *name; 290 int fl; 291 292 name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL); 293 if (name == NULL) 294 return -ENOMEM; 295 296 sprintf (name, CHRDEV "%x", minor); 297 298 port = parport_find_number (minor); 299 if (!port) { 300 printk (KERN_WARNING "%s: no associated port!\n", name); 301 kfree (name); 302 return -ENXIO; 303 } 304 305 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 306 pdev = parport_register_device (port, name, NULL, 307 NULL, pp_irq, fl, pp); 308 parport_put_port (port); 309 310 if (!pdev) { 311 printk (KERN_WARNING "%s: failed to register device!\n", name); 312 kfree (name); 313 return -ENXIO; 314 } 315 316 pp->pdev = pdev; 317 printk (KERN_DEBUG "%s: registered pardevice\n", name); 318 return 0; 319} 320 321static enum ieee1284_phase init_phase (int mode) 322{ 323 switch (mode & ~(IEEE1284_DEVICEID 324 | IEEE1284_ADDR)) { 325 case IEEE1284_MODE_NIBBLE: 326 case IEEE1284_MODE_BYTE: 327 return IEEE1284_PH_REV_IDLE; 328 } 329 return IEEE1284_PH_FWD_IDLE; 330} 331 332static int pp_ioctl(struct inode *inode, struct file *file, 333 unsigned int cmd, unsigned long arg) 334{ 335 unsigned int minor = iminor(inode); 336 struct pp_struct *pp = file->private_data; 337 struct parport * port; 338 void __user *argp = (void __user *)arg; 339 340 /* First handle the cases that don't take arguments. */ 341 switch (cmd) { 342 case PPCLAIM: 343 { 344 struct ieee1284_info *info; 345 int ret; 346 347 if (pp->flags & PP_CLAIMED) { 348 printk (KERN_DEBUG CHRDEV 349 "%x: you've already got it!\n", minor); 350 return -EINVAL; 351 } 352 353 /* Deferred device registration. */ 354 if (!pp->pdev) { 355 int err = register_device (minor, pp); 356 if (err) { 357 return err; 358 } 359 } 360 361 ret = parport_claim_or_block (pp->pdev); 362 if (ret < 0) 363 return ret; 364 365 pp->flags |= PP_CLAIMED; 366 367 /* For interrupt-reporting to work, we need to be 368 * informed of each interrupt. */ 369 pp_enable_irq (pp); 370 371 /* We may need to fix up the state machine. */ 372 info = &pp->pdev->port->ieee1284; 373 pp->saved_state.mode = info->mode; 374 pp->saved_state.phase = info->phase; 375 info->mode = pp->state.mode; 376 info->phase = pp->state.phase; 377 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 378 parport_set_timeout (pp->pdev, pp->default_inactivity); 379 380 return 0; 381 } 382 case PPEXCL: 383 if (pp->pdev) { 384 printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; " 385 "already registered\n", minor); 386 if (pp->flags & PP_EXCL) 387 /* But it's not really an error. */ 388 return 0; 389 /* There's no chance of making the driver happy. */ 390 return -EINVAL; 391 } 392 393 /* Just remember to register the device exclusively 394 * when we finally do the registration. */ 395 pp->flags |= PP_EXCL; 396 return 0; 397 case PPSETMODE: 398 { 399 int mode; 400 if (copy_from_user (&mode, argp, sizeof (mode))) 401 return -EFAULT; 402 /* FIXME: validate mode */ 403 pp->state.mode = mode; 404 pp->state.phase = init_phase (mode); 405 406 if (pp->flags & PP_CLAIMED) { 407 pp->pdev->port->ieee1284.mode = mode; 408 pp->pdev->port->ieee1284.phase = pp->state.phase; 409 } 410 411 return 0; 412 } 413 case PPGETMODE: 414 { 415 int mode; 416 417 if (pp->flags & PP_CLAIMED) { 418 mode = pp->pdev->port->ieee1284.mode; 419 } else { 420 mode = pp->state.mode; 421 } 422 if (copy_to_user (argp, &mode, sizeof (mode))) { 423 return -EFAULT; 424 } 425 return 0; 426 } 427 case PPSETPHASE: 428 { 429 int phase; 430 if (copy_from_user (&phase, argp, sizeof (phase))) { 431 return -EFAULT; 432 } 433 /* FIXME: validate phase */ 434 pp->state.phase = phase; 435 436 if (pp->flags & PP_CLAIMED) { 437 pp->pdev->port->ieee1284.phase = phase; 438 } 439 440 return 0; 441 } 442 case PPGETPHASE: 443 { 444 int phase; 445 446 if (pp->flags & PP_CLAIMED) { 447 phase = pp->pdev->port->ieee1284.phase; 448 } else { 449 phase = pp->state.phase; 450 } 451 if (copy_to_user (argp, &phase, sizeof (phase))) { 452 return -EFAULT; 453 } 454 return 0; 455 } 456 case PPGETMODES: 457 { 458 unsigned int modes; 459 460 port = parport_find_number (minor); 461 if (!port) 462 return -ENODEV; 463 464 modes = port->modes; 465 if (copy_to_user (argp, &modes, sizeof (modes))) { 466 return -EFAULT; 467 } 468 return 0; 469 } 470 case PPSETFLAGS: 471 { 472 int uflags; 473 474 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 475 return -EFAULT; 476 } 477 pp->flags &= ~PP_FLAGMASK; 478 pp->flags |= (uflags & PP_FLAGMASK); 479 return 0; 480 } 481 case PPGETFLAGS: 482 { 483 int uflags; 484 485 uflags = pp->flags & PP_FLAGMASK; 486 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 487 return -EFAULT; 488 } 489 return 0; 490 } 491 } /* end switch() */ 492 493 /* Everything else requires the port to be claimed, so check 494 * that now. */ 495 if ((pp->flags & PP_CLAIMED) == 0) { 496 printk (KERN_DEBUG CHRDEV "%x: claim the port first\n", 497 minor); 498 return -EINVAL; 499 } 500 501 port = pp->pdev->port; 502 switch (cmd) { 503 struct ieee1284_info *info; 504 unsigned char reg; 505 unsigned char mask; 506 int mode; 507 int ret; 508 struct timeval par_timeout; 509 long to_jiffies; 510 511 case PPRSTATUS: 512 reg = parport_read_status (port); 513 if (copy_to_user (argp, ®, sizeof (reg))) 514 return -EFAULT; 515 return 0; 516 case PPRDATA: 517 reg = parport_read_data (port); 518 if (copy_to_user (argp, ®, sizeof (reg))) 519 return -EFAULT; 520 return 0; 521 case PPRCONTROL: 522 reg = parport_read_control (port); 523 if (copy_to_user (argp, ®, sizeof (reg))) 524 return -EFAULT; 525 return 0; 526 case PPYIELD: 527 parport_yield_blocking (pp->pdev); 528 return 0; 529 530 case PPRELEASE: 531 /* Save the state machine's state. */ 532 info = &pp->pdev->port->ieee1284; 533 pp->state.mode = info->mode; 534 pp->state.phase = info->phase; 535 info->mode = pp->saved_state.mode; 536 info->phase = pp->saved_state.phase; 537 parport_release (pp->pdev); 538 pp->flags &= ~PP_CLAIMED; 539 return 0; 540 541 case PPWCONTROL: 542 if (copy_from_user (®, argp, sizeof (reg))) 543 return -EFAULT; 544 parport_write_control (port, reg); 545 return 0; 546 547 case PPWDATA: 548 if (copy_from_user (®, argp, sizeof (reg))) 549 return -EFAULT; 550 parport_write_data (port, reg); 551 return 0; 552 553 case PPFCONTROL: 554 if (copy_from_user (&mask, argp, 555 sizeof (mask))) 556 return -EFAULT; 557 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 558 sizeof (reg))) 559 return -EFAULT; 560 parport_frob_control (port, mask, reg); 561 return 0; 562 563 case PPDATADIR: 564 if (copy_from_user (&mode, argp, sizeof (mode))) 565 return -EFAULT; 566 if (mode) 567 port->ops->data_reverse (port); 568 else 569 port->ops->data_forward (port); 570 return 0; 571 572 case PPNEGOT: 573 if (copy_from_user (&mode, argp, sizeof (mode))) 574 return -EFAULT; 575 switch ((ret = parport_negotiate (port, mode))) { 576 case 0: break; 577 case -1: /* handshake failed, peripheral not IEEE 1284 */ 578 ret = -EIO; 579 break; 580 case 1: /* handshake succeeded, peripheral rejected mode */ 581 ret = -ENXIO; 582 break; 583 } 584 pp_enable_irq (pp); 585 return ret; 586 587 case PPWCTLONIRQ: 588 if (copy_from_user (®, argp, sizeof (reg))) 589 return -EFAULT; 590 591 /* Remember what to set the control lines to, for next 592 * time we get an interrupt. */ 593 pp->irqctl = reg; 594 pp->irqresponse = 1; 595 return 0; 596 597 case PPCLRIRQ: 598 ret = atomic_read (&pp->irqc); 599 if (copy_to_user (argp, &ret, sizeof (ret))) 600 return -EFAULT; 601 atomic_sub (ret, &pp->irqc); 602 return 0; 603 604 case PPSETTIME: 605 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 606 return -EFAULT; 607 } 608 /* Convert to jiffies, place in pp->pdev->timeout */ 609 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 610 return -EINVAL; 611 } 612 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 613 to_jiffies += par_timeout.tv_sec * (long)HZ; 614 if (to_jiffies <= 0) { 615 return -EINVAL; 616 } 617 pp->pdev->timeout = to_jiffies; 618 return 0; 619 620 case PPGETTIME: 621 to_jiffies = pp->pdev->timeout; 622 par_timeout.tv_sec = to_jiffies / HZ; 623 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 624 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 625 return -EFAULT; 626 return 0; 627 628 default: 629 printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor, 630 cmd); 631 return -EINVAL; 632 } 633 634 /* Keep the compiler happy */ 635 return 0; 636} 637 638static int pp_open (struct inode * inode, struct file * file) 639{ 640 unsigned int minor = iminor(inode); 641 struct pp_struct *pp; 642 643 if (minor >= PARPORT_MAX) 644 return -ENXIO; 645 646 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 647 if (!pp) 648 return -ENOMEM; 649 650 pp->state.mode = IEEE1284_MODE_COMPAT; 651 pp->state.phase = init_phase (pp->state.mode); 652 pp->flags = 0; 653 pp->irqresponse = 0; 654 atomic_set (&pp->irqc, 0); 655 init_waitqueue_head (&pp->irq_wait); 656 657 /* Defer the actual device registration until the first claim. 658 * That way, we know whether or not the driver wants to have 659 * exclusive access to the port (PPEXCL). 660 */ 661 pp->pdev = NULL; 662 file->private_data = pp; 663 664 return 0; 665} 666 667static int pp_release (struct inode * inode, struct file * file) 668{ 669 unsigned int minor = iminor(inode); 670 struct pp_struct *pp = file->private_data; 671 int compat_negot; 672 673 compat_negot = 0; 674 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 675 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 676 struct ieee1284_info *info; 677 678 /* parport released, but not in compatibility mode */ 679 parport_claim_or_block (pp->pdev); 680 pp->flags |= PP_CLAIMED; 681 info = &pp->pdev->port->ieee1284; 682 pp->saved_state.mode = info->mode; 683 pp->saved_state.phase = info->phase; 684 info->mode = pp->state.mode; 685 info->phase = pp->state.phase; 686 compat_negot = 1; 687 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 688 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 689 compat_negot = 2; 690 } 691 if (compat_negot) { 692 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 693 printk (KERN_DEBUG CHRDEV 694 "%x: negotiated back to compatibility mode because " 695 "user-space forgot\n", minor); 696 } 697 698 if (pp->flags & PP_CLAIMED) { 699 struct ieee1284_info *info; 700 701 info = &pp->pdev->port->ieee1284; 702 pp->state.mode = info->mode; 703 pp->state.phase = info->phase; 704 info->mode = pp->saved_state.mode; 705 info->phase = pp->saved_state.phase; 706 parport_release (pp->pdev); 707 if (compat_negot != 1) { 708 printk (KERN_DEBUG CHRDEV "%x: released pardevice " 709 "because user-space forgot\n", minor); 710 } 711 } 712 713 if (pp->pdev) { 714 const char *name = pp->pdev->name; 715 parport_unregister_device (pp->pdev); 716 kfree (name); 717 pp->pdev = NULL; 718 printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n", 719 minor); 720 } 721 722 kfree (pp); 723 724 return 0; 725} 726 727/* No kernel lock held - fine */ 728static 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 740static struct class *ppdev_class; 741 742static 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 .ioctl = pp_ioctl, 749 .open = pp_open, 750 .release = pp_release, 751}; 752 753static void pp_attach(struct parport *port) 754{ 755 class_device_create(ppdev_class, MKDEV(PP_MAJOR, port->number), 756 NULL, "parport%d", port->number); 757} 758 759static void pp_detach(struct parport *port) 760{ 761 class_device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 762} 763 764static struct parport_driver pp_driver = { 765 .name = CHRDEV, 766 .attach = pp_attach, 767 .detach = pp_detach, 768}; 769 770static int __init ppdev_init (void) 771{ 772 int i, 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 devfs_mk_dir("parports"); 785 for (i = 0; i < PARPORT_MAX; i++) { 786 devfs_mk_cdev(MKDEV(PP_MAJOR, i), 787 S_IFCHR | S_IRUGO | S_IWUGO, "parports/%d", i); 788 } 789 if (parport_register_driver(&pp_driver)) { 790 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 791 goto out_class; 792 } 793 794 printk (KERN_INFO PP_VERSION "\n"); 795 goto out; 796 797out_class: 798 for (i = 0; i < PARPORT_MAX; i++) 799 devfs_remove("parports/%d", i); 800 devfs_remove("parports"); 801 class_destroy(ppdev_class); 802out_chrdev: 803 unregister_chrdev(PP_MAJOR, CHRDEV); 804out: 805 return err; 806} 807 808static void __exit ppdev_cleanup (void) 809{ 810 int i; 811 /* Clean up all parport stuff */ 812 for (i = 0; i < PARPORT_MAX; i++) 813 devfs_remove("parports/%d", i); 814 parport_unregister_driver(&pp_driver); 815 devfs_remove("parports"); 816 class_destroy(ppdev_class); 817 unregister_chrdev (PP_MAJOR, CHRDEV); 818} 819 820module_init(ppdev_init); 821module_exit(ppdev_cleanup); 822 823MODULE_LICENSE("GPL"); 824MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 825