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/mutex.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 DEFINE_MUTEX(pp_do_mutex); 101static 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 107static ssize_t pp_read (struct file * file, char __user * buf, size_t count, 108 loff_t * ppos) 109{ 110 unsigned int minor = iminor(file_inode(file)); 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 pr_debug(CHRDEV "%x: claim the port first\n", 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_inode(file)); 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 pr_debug(CHRDEV "%x: claim the port first\n", 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 break; 256 257 cond_resched(); 258 } 259 260 parport_set_timeout (pp->pdev, pp->default_inactivity); 261 262 kfree (kbuffer); 263 pp_enable_irq (pp); 264 return bytes_written; 265} 266 267static void pp_irq (void *private) 268{ 269 struct pp_struct *pp = private; 270 271 if (pp->irqresponse) { 272 parport_write_control (pp->pdev->port, pp->irqctl); 273 pp->irqresponse = 0; 274 } 275 276 atomic_inc (&pp->irqc); 277 wake_up_interruptible (&pp->irq_wait); 278} 279 280static int register_device (int minor, struct pp_struct *pp) 281{ 282 struct parport *port; 283 struct pardevice * pdev = NULL; 284 char *name; 285 int fl; 286 287 name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 288 if (name == NULL) 289 return -ENOMEM; 290 291 port = parport_find_number (minor); 292 if (!port) { 293 printk (KERN_WARNING "%s: no associated port!\n", name); 294 kfree (name); 295 return -ENXIO; 296 } 297 298 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 299 pdev = parport_register_device (port, name, NULL, 300 NULL, pp_irq, fl, pp); 301 parport_put_port (port); 302 303 if (!pdev) { 304 printk (KERN_WARNING "%s: failed to register device!\n", name); 305 kfree (name); 306 return -ENXIO; 307 } 308 309 pp->pdev = pdev; 310 pr_debug("%s: registered pardevice\n", name); 311 return 0; 312} 313 314static enum ieee1284_phase init_phase (int mode) 315{ 316 switch (mode & ~(IEEE1284_DEVICEID 317 | IEEE1284_ADDR)) { 318 case IEEE1284_MODE_NIBBLE: 319 case IEEE1284_MODE_BYTE: 320 return IEEE1284_PH_REV_IDLE; 321 } 322 return IEEE1284_PH_FWD_IDLE; 323} 324 325static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 326{ 327 unsigned int minor = iminor(file_inode(file)); 328 struct pp_struct *pp = file->private_data; 329 struct parport * port; 330 void __user *argp = (void __user *)arg; 331 332 /* First handle the cases that don't take arguments. */ 333 switch (cmd) { 334 case PPCLAIM: 335 { 336 struct ieee1284_info *info; 337 int ret; 338 339 if (pp->flags & PP_CLAIMED) { 340 pr_debug(CHRDEV "%x: you've already got it!\n", minor); 341 return -EINVAL; 342 } 343 344 /* Deferred device registration. */ 345 if (!pp->pdev) { 346 int err = register_device (minor, pp); 347 if (err) { 348 return err; 349 } 350 } 351 352 ret = parport_claim_or_block (pp->pdev); 353 if (ret < 0) 354 return ret; 355 356 pp->flags |= PP_CLAIMED; 357 358 /* For interrupt-reporting to work, we need to be 359 * informed of each interrupt. */ 360 pp_enable_irq (pp); 361 362 /* We may need to fix up the state machine. */ 363 info = &pp->pdev->port->ieee1284; 364 pp->saved_state.mode = info->mode; 365 pp->saved_state.phase = info->phase; 366 info->mode = pp->state.mode; 367 info->phase = pp->state.phase; 368 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 369 parport_set_timeout (pp->pdev, pp->default_inactivity); 370 371 return 0; 372 } 373 case PPEXCL: 374 if (pp->pdev) { 375 pr_debug(CHRDEV "%x: too late for PPEXCL; " 376 "already registered\n", minor); 377 if (pp->flags & PP_EXCL) 378 /* But it's not really an error. */ 379 return 0; 380 /* There's no chance of making the driver happy. */ 381 return -EINVAL; 382 } 383 384 /* Just remember to register the device exclusively 385 * when we finally do the registration. */ 386 pp->flags |= PP_EXCL; 387 return 0; 388 case PPSETMODE: 389 { 390 int mode; 391 if (copy_from_user (&mode, argp, sizeof (mode))) 392 return -EFAULT; 393 /* FIXME: validate mode */ 394 pp->state.mode = mode; 395 pp->state.phase = init_phase (mode); 396 397 if (pp->flags & PP_CLAIMED) { 398 pp->pdev->port->ieee1284.mode = mode; 399 pp->pdev->port->ieee1284.phase = pp->state.phase; 400 } 401 402 return 0; 403 } 404 case PPGETMODE: 405 { 406 int mode; 407 408 if (pp->flags & PP_CLAIMED) { 409 mode = pp->pdev->port->ieee1284.mode; 410 } else { 411 mode = pp->state.mode; 412 } 413 if (copy_to_user (argp, &mode, sizeof (mode))) { 414 return -EFAULT; 415 } 416 return 0; 417 } 418 case PPSETPHASE: 419 { 420 int phase; 421 if (copy_from_user (&phase, argp, sizeof (phase))) { 422 return -EFAULT; 423 } 424 /* FIXME: validate phase */ 425 pp->state.phase = phase; 426 427 if (pp->flags & PP_CLAIMED) { 428 pp->pdev->port->ieee1284.phase = phase; 429 } 430 431 return 0; 432 } 433 case PPGETPHASE: 434 { 435 int phase; 436 437 if (pp->flags & PP_CLAIMED) { 438 phase = pp->pdev->port->ieee1284.phase; 439 } else { 440 phase = pp->state.phase; 441 } 442 if (copy_to_user (argp, &phase, sizeof (phase))) { 443 return -EFAULT; 444 } 445 return 0; 446 } 447 case PPGETMODES: 448 { 449 unsigned int modes; 450 451 port = parport_find_number (minor); 452 if (!port) 453 return -ENODEV; 454 455 modes = port->modes; 456 parport_put_port(port); 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 memset(&par_timeout, 0, sizeof(par_timeout)); 614 par_timeout.tv_sec = to_jiffies / HZ; 615 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 616 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 617 return -EFAULT; 618 return 0; 619 620 default: 621 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); 622 return -EINVAL; 623 } 624 625 /* Keep the compiler happy */ 626 return 0; 627} 628 629static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 630{ 631 long ret; 632 mutex_lock(&pp_do_mutex); 633 ret = pp_do_ioctl(file, cmd, arg); 634 mutex_unlock(&pp_do_mutex); 635 return ret; 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 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 err = parport_register_driver(&pp_driver); 783 if (err < 0) { 784 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 785 goto out_class; 786 } 787 788 printk (KERN_INFO PP_VERSION "\n"); 789 goto out; 790 791out_class: 792 class_destroy(ppdev_class); 793out_chrdev: 794 unregister_chrdev(PP_MAJOR, CHRDEV); 795out: 796 return err; 797} 798 799static void __exit ppdev_cleanup (void) 800{ 801 /* Clean up all parport stuff */ 802 parport_unregister_driver(&pp_driver); 803 class_destroy(ppdev_class); 804 unregister_chrdev (PP_MAJOR, CHRDEV); 805} 806 807module_init(ppdev_init); 808module_exit(ppdev_cleanup); 809 810MODULE_LICENSE("GPL"); 811MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 812