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 76 struct 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)) 99 100 static DEFINE_MUTEX(pp_do_mutex); 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_path.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 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 } 188 189 static 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_path.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 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 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 = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); 292 if (name == NULL) 293 return -ENOMEM; 294 295 port = parport_find_number (minor); 296 if (!port) { 297 printk (KERN_WARNING "%s: no associated port!\n", name); 298 kfree (name); 299 return -ENXIO; 300 } 301 302 fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; 303 pdev = parport_register_device (port, name, NULL, 304 NULL, pp_irq, fl, pp); 305 parport_put_port (port); 306 307 if (!pdev) { 308 printk (KERN_WARNING "%s: failed to register device!\n", name); 309 kfree (name); 310 return -ENXIO; 311 } 312 313 pp->pdev = pdev; 314 pr_debug("%s: registered pardevice\n", name); 315 return 0; 316 } 317 318 static enum ieee1284_phase init_phase (int mode) 319 { 320 switch (mode & ~(IEEE1284_DEVICEID 321 | IEEE1284_ADDR)) { 322 case IEEE1284_MODE_NIBBLE: 323 case IEEE1284_MODE_BYTE: 324 return IEEE1284_PH_REV_IDLE; 325 } 326 return IEEE1284_PH_FWD_IDLE; 327 } 328 329 static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 330 { 331 unsigned int minor = iminor(file->f_path.dentry->d_inode); 332 struct pp_struct *pp = file->private_data; 333 struct parport * port; 334 void __user *argp = (void __user *)arg; 335 336 /* First handle the cases that don't take arguments. */ 337 switch (cmd) { 338 case PPCLAIM: 339 { 340 struct ieee1284_info *info; 341 int ret; 342 343 if (pp->flags & PP_CLAIMED) { 344 pr_debug(CHRDEV "%x: you've already got it!\n", minor); 345 return -EINVAL; 346 } 347 348 /* Deferred device registration. */ 349 if (!pp->pdev) { 350 int err = register_device (minor, pp); 351 if (err) { 352 return err; 353 } 354 } 355 356 ret = parport_claim_or_block (pp->pdev); 357 if (ret < 0) 358 return ret; 359 360 pp->flags |= PP_CLAIMED; 361 362 /* For interrupt-reporting to work, we need to be 363 * informed of each interrupt. */ 364 pp_enable_irq (pp); 365 366 /* We may need to fix up the state machine. */ 367 info = &pp->pdev->port->ieee1284; 368 pp->saved_state.mode = info->mode; 369 pp->saved_state.phase = info->phase; 370 info->mode = pp->state.mode; 371 info->phase = pp->state.phase; 372 pp->default_inactivity = parport_set_timeout (pp->pdev, 0); 373 parport_set_timeout (pp->pdev, pp->default_inactivity); 374 375 return 0; 376 } 377 case PPEXCL: 378 if (pp->pdev) { 379 pr_debug(CHRDEV "%x: too late for PPEXCL; " 380 "already registered\n", minor); 381 if (pp->flags & PP_EXCL) 382 /* But it's not really an error. */ 383 return 0; 384 /* There's no chance of making the driver happy. */ 385 return -EINVAL; 386 } 387 388 /* Just remember to register the device exclusively 389 * when we finally do the registration. */ 390 pp->flags |= PP_EXCL; 391 return 0; 392 case PPSETMODE: 393 { 394 int mode; 395 if (copy_from_user (&mode, argp, sizeof (mode))) 396 return -EFAULT; 397 /* FIXME: validate mode */ 398 pp->state.mode = mode; 399 pp->state.phase = init_phase (mode); 400 401 if (pp->flags & PP_CLAIMED) { 402 pp->pdev->port->ieee1284.mode = mode; 403 pp->pdev->port->ieee1284.phase = pp->state.phase; 404 } 405 406 return 0; 407 } 408 case PPGETMODE: 409 { 410 int mode; 411 412 if (pp->flags & PP_CLAIMED) { 413 mode = pp->pdev->port->ieee1284.mode; 414 } else { 415 mode = pp->state.mode; 416 } 417 if (copy_to_user (argp, &mode, sizeof (mode))) { 418 return -EFAULT; 419 } 420 return 0; 421 } 422 case PPSETPHASE: 423 { 424 int phase; 425 if (copy_from_user (&phase, argp, sizeof (phase))) { 426 return -EFAULT; 427 } 428 /* FIXME: validate phase */ 429 pp->state.phase = phase; 430 431 if (pp->flags & PP_CLAIMED) { 432 pp->pdev->port->ieee1284.phase = phase; 433 } 434 435 return 0; 436 } 437 case PPGETPHASE: 438 { 439 int phase; 440 441 if (pp->flags & PP_CLAIMED) { 442 phase = pp->pdev->port->ieee1284.phase; 443 } else { 444 phase = pp->state.phase; 445 } 446 if (copy_to_user (argp, &phase, sizeof (phase))) { 447 return -EFAULT; 448 } 449 return 0; 450 } 451 case PPGETMODES: 452 { 453 unsigned int modes; 454 455 port = parport_find_number (minor); 456 if (!port) 457 return -ENODEV; 458 459 modes = port->modes; 460 parport_put_port(port); 461 if (copy_to_user (argp, &modes, sizeof (modes))) { 462 return -EFAULT; 463 } 464 return 0; 465 } 466 case PPSETFLAGS: 467 { 468 int uflags; 469 470 if (copy_from_user (&uflags, argp, sizeof (uflags))) { 471 return -EFAULT; 472 } 473 pp->flags &= ~PP_FLAGMASK; 474 pp->flags |= (uflags & PP_FLAGMASK); 475 return 0; 476 } 477 case PPGETFLAGS: 478 { 479 int uflags; 480 481 uflags = pp->flags & PP_FLAGMASK; 482 if (copy_to_user (argp, &uflags, sizeof (uflags))) { 483 return -EFAULT; 484 } 485 return 0; 486 } 487 } /* end switch() */ 488 489 /* Everything else requires the port to be claimed, so check 490 * that now. */ 491 if ((pp->flags & PP_CLAIMED) == 0) { 492 pr_debug(CHRDEV "%x: claim the port first\n", minor); 493 return -EINVAL; 494 } 495 496 port = pp->pdev->port; 497 switch (cmd) { 498 struct ieee1284_info *info; 499 unsigned char reg; 500 unsigned char mask; 501 int mode; 502 int ret; 503 struct timeval par_timeout; 504 long to_jiffies; 505 506 case PPRSTATUS: 507 reg = parport_read_status (port); 508 if (copy_to_user (argp, ®, sizeof (reg))) 509 return -EFAULT; 510 return 0; 511 case PPRDATA: 512 reg = parport_read_data (port); 513 if (copy_to_user (argp, ®, sizeof (reg))) 514 return -EFAULT; 515 return 0; 516 case PPRCONTROL: 517 reg = parport_read_control (port); 518 if (copy_to_user (argp, ®, sizeof (reg))) 519 return -EFAULT; 520 return 0; 521 case PPYIELD: 522 parport_yield_blocking (pp->pdev); 523 return 0; 524 525 case PPRELEASE: 526 /* Save the state machine's state. */ 527 info = &pp->pdev->port->ieee1284; 528 pp->state.mode = info->mode; 529 pp->state.phase = info->phase; 530 info->mode = pp->saved_state.mode; 531 info->phase = pp->saved_state.phase; 532 parport_release (pp->pdev); 533 pp->flags &= ~PP_CLAIMED; 534 return 0; 535 536 case PPWCONTROL: 537 if (copy_from_user (®, argp, sizeof (reg))) 538 return -EFAULT; 539 parport_write_control (port, reg); 540 return 0; 541 542 case PPWDATA: 543 if (copy_from_user (®, argp, sizeof (reg))) 544 return -EFAULT; 545 parport_write_data (port, reg); 546 return 0; 547 548 case PPFCONTROL: 549 if (copy_from_user (&mask, argp, 550 sizeof (mask))) 551 return -EFAULT; 552 if (copy_from_user (®, 1 + (unsigned char __user *) arg, 553 sizeof (reg))) 554 return -EFAULT; 555 parport_frob_control (port, mask, reg); 556 return 0; 557 558 case PPDATADIR: 559 if (copy_from_user (&mode, argp, sizeof (mode))) 560 return -EFAULT; 561 if (mode) 562 port->ops->data_reverse (port); 563 else 564 port->ops->data_forward (port); 565 return 0; 566 567 case PPNEGOT: 568 if (copy_from_user (&mode, argp, sizeof (mode))) 569 return -EFAULT; 570 switch ((ret = parport_negotiate (port, mode))) { 571 case 0: break; 572 case -1: /* handshake failed, peripheral not IEEE 1284 */ 573 ret = -EIO; 574 break; 575 case 1: /* handshake succeeded, peripheral rejected mode */ 576 ret = -ENXIO; 577 break; 578 } 579 pp_enable_irq (pp); 580 return ret; 581 582 case PPWCTLONIRQ: 583 if (copy_from_user (®, argp, sizeof (reg))) 584 return -EFAULT; 585 586 /* Remember what to set the control lines to, for next 587 * time we get an interrupt. */ 588 pp->irqctl = reg; 589 pp->irqresponse = 1; 590 return 0; 591 592 case PPCLRIRQ: 593 ret = atomic_read (&pp->irqc); 594 if (copy_to_user (argp, &ret, sizeof (ret))) 595 return -EFAULT; 596 atomic_sub (ret, &pp->irqc); 597 return 0; 598 599 case PPSETTIME: 600 if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) { 601 return -EFAULT; 602 } 603 /* Convert to jiffies, place in pp->pdev->timeout */ 604 if ((par_timeout.tv_sec < 0) || (par_timeout.tv_usec < 0)) { 605 return -EINVAL; 606 } 607 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 608 to_jiffies += par_timeout.tv_sec * (long)HZ; 609 if (to_jiffies <= 0) { 610 return -EINVAL; 611 } 612 pp->pdev->timeout = to_jiffies; 613 return 0; 614 615 case PPGETTIME: 616 to_jiffies = pp->pdev->timeout; 617 memset(&par_timeout, 0, sizeof(par_timeout)); 618 par_timeout.tv_sec = to_jiffies / HZ; 619 par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ); 620 if (copy_to_user (argp, &par_timeout, sizeof(struct timeval))) 621 return -EFAULT; 622 return 0; 623 624 default: 625 pr_debug(CHRDEV "%x: What? (cmd=0x%x)\n", minor, cmd); 626 return -EINVAL; 627 } 628 629 /* Keep the compiler happy */ 630 return 0; 631 } 632 633 static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 634 { 635 long ret; 636 mutex_lock(&pp_do_mutex); 637 ret = pp_do_ioctl(file, cmd, arg); 638 mutex_unlock(&pp_do_mutex); 639 return ret; 640 } 641 642 static int pp_open (struct inode * inode, struct file * file) 643 { 644 unsigned int minor = iminor(inode); 645 struct pp_struct *pp; 646 647 if (minor >= PARPORT_MAX) 648 return -ENXIO; 649 650 pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL); 651 if (!pp) 652 return -ENOMEM; 653 654 pp->state.mode = IEEE1284_MODE_COMPAT; 655 pp->state.phase = init_phase (pp->state.mode); 656 pp->flags = 0; 657 pp->irqresponse = 0; 658 atomic_set (&pp->irqc, 0); 659 init_waitqueue_head (&pp->irq_wait); 660 661 /* Defer the actual device registration until the first claim. 662 * That way, we know whether or not the driver wants to have 663 * exclusive access to the port (PPEXCL). 664 */ 665 pp->pdev = NULL; 666 file->private_data = pp; 667 668 return 0; 669 } 670 671 static int pp_release (struct inode * inode, struct file * file) 672 { 673 unsigned int minor = iminor(inode); 674 struct pp_struct *pp = file->private_data; 675 int compat_negot; 676 677 compat_negot = 0; 678 if (!(pp->flags & PP_CLAIMED) && pp->pdev && 679 (pp->state.mode != IEEE1284_MODE_COMPAT)) { 680 struct ieee1284_info *info; 681 682 /* parport released, but not in compatibility mode */ 683 parport_claim_or_block (pp->pdev); 684 pp->flags |= PP_CLAIMED; 685 info = &pp->pdev->port->ieee1284; 686 pp->saved_state.mode = info->mode; 687 pp->saved_state.phase = info->phase; 688 info->mode = pp->state.mode; 689 info->phase = pp->state.phase; 690 compat_negot = 1; 691 } else if ((pp->flags & PP_CLAIMED) && pp->pdev && 692 (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) { 693 compat_negot = 2; 694 } 695 if (compat_negot) { 696 parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT); 697 pr_debug(CHRDEV "%x: negotiated back to compatibility " 698 "mode because user-space forgot\n", minor); 699 } 700 701 if (pp->flags & PP_CLAIMED) { 702 struct ieee1284_info *info; 703 704 info = &pp->pdev->port->ieee1284; 705 pp->state.mode = info->mode; 706 pp->state.phase = info->phase; 707 info->mode = pp->saved_state.mode; 708 info->phase = pp->saved_state.phase; 709 parport_release (pp->pdev); 710 if (compat_negot != 1) { 711 pr_debug(CHRDEV "%x: released pardevice " 712 "because user-space forgot\n", minor); 713 } 714 } 715 716 if (pp->pdev) { 717 const char *name = pp->pdev->name; 718 parport_unregister_device (pp->pdev); 719 kfree (name); 720 pp->pdev = NULL; 721 pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); 722 } 723 724 kfree (pp); 725 726 return 0; 727 } 728 729 /* No kernel lock held - fine */ 730 static unsigned int pp_poll (struct file * file, poll_table * wait) 731 { 732 struct pp_struct *pp = file->private_data; 733 unsigned int mask = 0; 734 735 poll_wait (file, &pp->irq_wait, wait); 736 if (atomic_read (&pp->irqc)) 737 mask |= POLLIN | POLLRDNORM; 738 739 return mask; 740 } 741 742 static struct class *ppdev_class; 743 744 static const struct file_operations pp_fops = { 745 .owner = THIS_MODULE, 746 .llseek = no_llseek, 747 .read = pp_read, 748 .write = pp_write, 749 .poll = pp_poll, 750 .unlocked_ioctl = pp_ioctl, 751 .open = pp_open, 752 .release = pp_release, 753 }; 754 755 static void pp_attach(struct parport *port) 756 { 757 device_create(ppdev_class, port->dev, MKDEV(PP_MAJOR, port->number), 758 NULL, "parport%d", port->number); 759 } 760 761 static void pp_detach(struct parport *port) 762 { 763 device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number)); 764 } 765 766 static struct parport_driver pp_driver = { 767 .name = CHRDEV, 768 .attach = pp_attach, 769 .detach = pp_detach, 770 }; 771 772 static int __init ppdev_init (void) 773 { 774 int err = 0; 775 776 if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) { 777 printk (KERN_WARNING CHRDEV ": unable to get major %d\n", 778 PP_MAJOR); 779 return -EIO; 780 } 781 ppdev_class = class_create(THIS_MODULE, CHRDEV); 782 if (IS_ERR(ppdev_class)) { 783 err = PTR_ERR(ppdev_class); 784 goto out_chrdev; 785 } 786 if (parport_register_driver(&pp_driver)) { 787 printk (KERN_WARNING CHRDEV ": unable to register with parport\n"); 788 goto out_class; 789 } 790 791 printk (KERN_INFO PP_VERSION "\n"); 792 goto out; 793 794 out_class: 795 class_destroy(ppdev_class); 796 out_chrdev: 797 unregister_chrdev(PP_MAJOR, CHRDEV); 798 out: 799 return err; 800 } 801 802 static void __exit ppdev_cleanup (void) 803 { 804 /* Clean up all parport stuff */ 805 parport_unregister_driver(&pp_driver); 806 class_destroy(ppdev_class); 807 unregister_chrdev (PP_MAJOR, CHRDEV); 808 } 809 810 module_init(ppdev_init); 811 module_exit(ppdev_cleanup); 812 813 MODULE_LICENSE("GPL"); 814 MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); 815