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 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_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 188static 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 270static 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 283static 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 317static 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 328static 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 pp->state.mode = mode; 397 pp->state.phase = init_phase (mode); 398 399 if (pp->flags & PP_CLAIMED) { 400 pp->pdev->port->ieee1284.mode = mode; 401 pp->pdev->port->ieee1284.phase = pp->state.phase; 402 } 403 404 return 0; 405 } 406 case PPGETMODE: 407 { 408 int mode; 409 410 if (pp->flags & PP_CLAIMED) { 411 mode = pp->pdev->port->ieee1284.mode; 412 } else { 413 mode = pp->state.mode; 414 } 415 if (copy_to_user (argp, &mode, sizeof (mode))) { 416 return -EFAULT; 417 } 418 return 0; 419 } 420 case PPSETPHASE: 421 { 422 int phase; 423 if (copy_from_user (&phase, argp, sizeof (phase))) { 424 return -EFAULT; 425 } 426 pp->state.phase = phase; 427 428 if (pp->flags & PP_CLAIMED) { 429 pp->pdev->port->ieee1284.phase = phase; 430 } 431 432 return 0; 433 } 434 case PPGETPHASE: 435 { 436 int phase; 437 438 if (pp->flags & PP_CLAIMED) { 439 phase = pp->pdev->port->ieee1284.phase; 440 } else { 441 phase = pp->state.phase; 442 } 443 if (copy_to_user (argp, &phase, sizeof (phase))) { 444 return -EFAULT; 445 } 446 return 0; 447 } 448 case PPGETMODES: 449 { 450 unsigned int modes; 451 452 port = parport_find_number (minor); 453 if (!port) 454 return -ENODEV; 455 456 modes = port->modes; 457 if (copy_to_user (argp, &modes, sizeof (modes))) { 458 return -EFAULT; 459 } 460 return 0; 461 } 462 case PPSETFLAGS: 463 { 464 int uflags; 465 466 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 467 return -EFAULT; 468 } 469 pp->flags &= ~PP_FLAGMASK; 470 pp->flags |= (uflags & PP_FLAGMASK); 471 return 0; 472 } 473 case PPGETFLAGS: 474 { 475 int uflags; 476 477 uflags = pp->flags & PP_FLAGMASK; 478 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 479 return -EFAULT; 480 } 481 return 0; 482 } 483 } /* end switch() */ 484 485 /* Everything else requires the port to be claimed, so check 486 * that now. */ 487 if ((pp->flags & PP_CLAIMED) == 0) { 488 pr_debug(CHRDEV "%x: claim the port first\n", minor); 489 return -EINVAL; 490 } 491 492 port = pp->pdev->port; 493 switch (cmd) { 494 struct ieee1284_info *info; 495 unsigned char reg; 496 unsigned char mask; 497 int mode; 498 int ret; 499 struct timeval par_timeout; 500 long to_jiffies; 501 502 case PPRSTATUS: 503 reg = parport_read_status (port); 504 if (copy_to_user (argp, ®, sizeof (reg))) 505 return -EFAULT; 506 return 0; 507 case PPRDATA: 508 reg = parport_read_data (port); 509 if (copy_to_user (argp, ®, sizeof (reg))) 510 return -EFAULT; 511 return 0; 512 case PPRCONTROL: 513 reg = parport_read_control (port); 514 if (copy_to_user (argp, ®, sizeof (reg))) 515 return -EFAULT; 516 return 0; 517 case PPYIELD: 518 parport_yield_blocking (pp->pdev); 519 return 0; 520 521 case PPRELEASE: 522 /* Save the state machine's state. */ 523 info = &pp->pdev->port->ieee1284; 524 pp->state.mode = info->mode; 525 pp->state.phase = info->phase; 526 info->mode = pp->saved_state.mode; 527 info->phase = pp->saved_state.phase; 528 parport_release (pp->pdev); 529 pp->flags &= ~PP_CLAIMED; 530 return 0; 531 532 case PPWCONTROL: 533 if (copy_from_user (®, argp, sizeof (reg))) 534 return -EFAULT; 535 parport_write_control (port, reg); 536 return 0; 537 538 case PPWDATA: 539 if (copy_from_user (®, argp, sizeof (reg))) 540 return -EFAULT; 541 parport_write_data (port, reg); 542 return 0; 543 544 case PPFCONTROL: 545 if (copy_from_user (&mask, argp, 546 sizeof (mask))) 547 return -EFAULT; 548 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 549 sizeof (reg))) 550 return -EFAULT; 551 parport_frob_control (port, mask, reg); 552 return 0; 553 554 case PPDATADIR: 555 if (copy_from_user (&mode, argp, sizeof (mode))) 556 return -EFAULT; 557 if (mode) 558 port->ops->data_reverse (port); 559 else 560 port->ops->data_forward (port); 561 return 0; 562 563 case PPNEGOT: 564 if (copy_from_user (&mode, argp, sizeof (mode))) 565 return -EFAULT; 566 switch ((ret = parport_negotiate (port, mode))) { 567 case 0: break; 568 case -1: /* handshake failed, peripheral not IEEE 1284 */ 569 ret = -EIO; 570 break; 571 case 1: /* handshake succeeded, peripheral rejected mode */ 572 ret = -ENXIO; 573 break; 574 } 575 pp_enable_irq (pp); 576 return ret; 577 578 case PPWCTLONIRQ: 579 if (copy_from_user (®, argp, sizeof (reg))) 580 return -EFAULT; 581 582 /* Remember what to set the control lines to, for next 583 * time we get an interrupt. */ 584 pp->irqctl = reg; 585 pp->irqresponse = 1; 586 return 0; 587 588 case PPCLRIRQ: 589 ret = atomic_read (&pp->irqc); 590 if (copy_to_user (argp, &ret, sizeof (ret))) 591 return -EFAULT; 592 atomic_sub (ret, &pp->irqc); 593 return 0; 594 595 case PPSETTIME: 596 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 597 return -EFAULT; 598 } 599 /* Convert to jiffies, place in pp->pdev->timeout */ 600 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 601 return -EINVAL; 602 } 603 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 604 to_jiffies += par_timeout.tv_sec * (long)HZ; 605 if (to_jiffies <= 0) { 606 return -EINVAL; 607 } 608 pp->pdev->timeout = to_jiffies; 609 return 0; 610 611 case PPGETTIME: 612 to_jiffies = pp->pdev->timeout; 613 par_timeout.tv_sec = to_jiffies / HZ; 614 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 615 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 616 return -EFAULT; 617 return 0; 618 619 default: 620 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); 621 return -EINVAL; 622 } 623 624 /* Keep the compiler happy */ 625 return 0; 626} 627 628static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 629{ 630 long ret; 631 lock_kernel(); 632 ret = pp_do_ioctl(file, cmd, arg); 633 unlock_kernel(); 634 return ret; 635} 636 637static int pp_open (struct inode * inode, struct file * file) 638{ 639 unsigned int minor = iminor(inode); 640 struct pp_struct *pp; 641 642 cycle_kernel_lock(); 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 pr_debug(CHRDEV "%x: negotiated back to compatibility " 694 "mode because user-space forgot\n", minor); 695 } 696 697 if (pp->flags & PP_CLAIMED) { 698 struct ieee1284_info *info; 699 700 info = &pp->pdev->port->ieee1284; 701 pp->state.mode = info->mode; 702 pp->state.phase = info->phase; 703 info->mode = pp->saved_state.mode; 704 info->phase = pp->saved_state.phase; 705 parport_release (pp->pdev); 706 if (compat_negot != 1) { 707 pr_debug(CHRDEV "%x: released pardevice " 708 "because user-space forgot\n", minor); 709 } 710 } 711 712 if (pp->pdev) { 713 const char *name = pp->pdev->name; 714 parport_unregister_device (pp->pdev); 715 kfree (name); 716 pp->pdev = NULL; 717 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 718 } 719 720 kfree (pp); 721 722 return 0; 723} 724 725/* No kernel lock held - fine */ 726static 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 738static struct class *ppdev_class; 739 740static 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 .unlocked_ioctl = pp_ioctl, 747 .open = pp_open, 748 .release = pp_release, 749}; 750 751static void pp_attach(struct parport *port) 752{ 753 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 754 NULL, "parport%d", port->number); 755} 756 757static void pp_detach(struct parport *port) 758{ 759 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 760} 761 762static struct parport_driver pp_driver = { 763 .name = CHRDEV, 764 .attach = pp_attach, 765 .detach = pp_detach, 766}; 767 768static 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 790out_class: 791 class_destroy(ppdev_class); 792out_chrdev: 793 unregister_chrdev(PP_MAJOR, CHRDEV); 794out: 795 return err; 796} 797 798static 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 806module_init(ppdev_init); 807module_exit(ppdev_cleanup); 808 809MODULE_LICENSE("GPL"); 810MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 811