drivers/char/ppdev.c

   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, &reg, sizeof (reg)))
 515                         return -EFAULT;
 516                 return 0;
 517         case PPRDATA:
 518                 reg = parport_read_data (port);
 519                 if (copy_to_user (argp, &reg, sizeof (reg)))
 520                         return -EFAULT;
 521                 return 0;
 522         case PPRCONTROL:
 523                 reg = parport_read_control (port);
 524                 if (copy_to_user (argp, &reg, 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 (&reg, argp, sizeof (reg)))
 544                         return -EFAULT;
 545                 parport_write_control (port, reg);
 546                 return 0;
 547
 548         case PPWDATA:
 549                 if (copy_from_user (&reg, 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 (&reg, 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 (&reg, 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);