drivers/char/lp.c

   1 /*
   2  * Generic parallel printer driver
   3  *
   4  * Copyright (C) 1992 by Jim Weigand and Linus Torvalds
   5  * Copyright (C) 1992,1993 by Michael K. Johnson
   6  * - Thanks much to Gunter Windau for pointing out to me where the error
   7  *   checking ought to be.
   8  * Copyright (C) 1993 by Nigel Gamble (added interrupt code)
   9  * Copyright (C) 1994 by Alan Cox (Modularised it)
  10  * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
  11  * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
  12  * "lp=" command line parameters added by Grant Guenther, grant@torque.net
  13  * lp_read (Status readback) support added by Carsten Gross,
  14  *                                             carsten@sol.wohnheim.uni-ulm.de
  15  * Support for parport by Philip Blundell <philb@gnu.org>
  16  * Parport sharing hacking by Andrea Arcangeli
  17  * Fixed kernel_(to/from)_user memory copy to check for errors
  18  *                              by Riccardo Facchetti <fizban@tin.it>
  19  * 22-JAN-1998  Added support for devfs  Richard Gooch <rgooch@atnf.csiro.au>
  20  * Redesigned interrupt handling for handle printers with buggy handshake
  21  *                              by Andrea Arcangeli, 11 May 1998
  22  * Full efficient handling of printer with buggy irq handshake (now I have
  23  * understood the meaning of the strange handshake). This is done sending new
  24  * characters if the interrupt is just happened, even if the printer say to
  25  * be still BUSY. This is needed at least with Epson Stylus Color. To enable
  26  * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
  27  * Fixed the irq on the rising edge of the strobe case.
  28  * Obsoleted the CAREFUL flag since a printer that doesn' t work with
  29  * CAREFUL will block a bit after in lp_check_status().
  30  *                              Andrea Arcangeli, 15 Oct 1998
  31  * Obsoleted and removed all the lowlevel stuff implemented in the last
  32  * month to use the IEEE1284 functions (that handle the _new_ compatibilty
  33  * mode fine).
  34  */
  35
  36 /* This driver should, in theory, work with any parallel port that has an
  37  * appropriate low-level driver; all I/O is done through the parport
  38  * abstraction layer.
  39  *
  40  * If this driver is built into the kernel, you can configure it using the
  41  * kernel command-line.  For example:
  42  *
  43  *      lp=parport1,none,parport2       (bind lp0 to parport1, disable lp1 and
  44  *                                       bind lp2 to parport2)
  45  *
  46  *      lp=auto                         (assign lp devices to all ports that
  47  *                                       have printers attached, as determined
  48  *                                       by the IEEE-1284 autoprobe)
  49  *
  50  *      lp=reset                        (reset the printer during
  51  *                                       initialisation)
  52  *
  53  *      lp=off                          (disable the printer driver entirely)
  54  *
  55  * If the driver is loaded as a module, similar functionality is available
  56  * using module parameters.  The equivalent of the above commands would be:
  57  *
  58  *      # insmod lp.o parport=1,none,2
  59  *
  60  *      # insmod lp.o parport=auto
  61  *
  62  *      # insmod lp.o reset=1
  63  */
  64
  65 /* COMPATIBILITY WITH OLD KERNELS
  66  *
  67  * Under Linux 2.0 and previous versions, lp devices were bound to ports at
  68  * particular I/O addresses, as follows:
  69  *
  70  *      lp0             0x3bc
  71  *      lp1             0x378
  72  *      lp2             0x278
  73  *
  74  * The new driver, by default, binds lp devices to parport devices as it
  75  * finds them.  This means that if you only have one port, it will be bound
  76  * to lp0 regardless of its I/O address.  If you need the old behaviour, you
  77  * can force it using the parameters described above.
  78  */
  79
  80 /*
  81  * The new interrupt handling code take care of the buggy handshake
  82  * of some HP and Epson printer:
  83  * ___
  84  * ACK    _______________    ___________
  85  *                       |__|
  86  * ____
  87  * BUSY   _________              _______
  88  *                 |____________|
  89  *
  90  * I discovered this using the printer scanner that you can find at:
  91  *
  92  *      ftp://e-mind.com/pub/linux/pscan/
  93  *
  94  *                                      11 May 98, Andrea Arcangeli
  95  *
  96  * My printer scanner run on an Epson Stylus Color show that such printer
  97  * generates the irq on the _rising_ edge of the STROBE. Now lp handle
  98  * this case fine too.
  99  *
 100  *                                      15 Oct 1998, Andrea Arcangeli
 101  *
 102  * The so called `buggy' handshake is really the well documented
 103  * compatibility mode IEEE1284 handshake. They changed the well known
 104  * Centronics handshake acking in the middle of busy expecting to not
 105  * break drivers or legacy application, while they broken linux lp
 106  * until I fixed it reverse engineering the protocol by hand some
 107  * month ago...
 108  *
 109  *                                     14 Dec 1998, Andrea Arcangeli
 110  *
 111  * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
 112  */
 113
 114 #include <linux/module.h>
 115 #include <linux/init.h>
 116
 117 #include <linux/config.h>
 118 #include <linux/errno.h>
 119 #include <linux/kernel.h>
 120 #include <linux/major.h>
 121 #include <linux/sched.h>
 122 #include <linux/smp_lock.h>
 123 #include <linux/devfs_fs_kernel.h>
 124 #include <linux/slab.h>
 125 #include <linux/fcntl.h>
 126 #include <linux/delay.h>
 127 #include <linux/poll.h>
 128 #include <linux/console.h>
 129 #include <linux/device.h>
 130 #include <linux/wait.h>
 131 #include <linux/jiffies.h>
 132
 133 #include <linux/parport.h>
 134 #undef LP_STATS
 135 #include <linux/lp.h>
 136
 137 #include <asm/irq.h>
 138 #include <asm/uaccess.h>
 139 #include <asm/system.h>
 140
 141 /* if you have more than 8 printers, remember to increase LP_NO */
 142 #define LP_NO 8
 143
 144 /* ROUND_UP macro from fs/select.c */
 145 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
 146
 147 static struct lp_struct lp_table[LP_NO];
 148
 149 static unsigned int lp_count = 0;
 150 static struct class *lp_class;
 151
 152 #ifdef CONFIG_LP_CONSOLE
 153 static struct parport *console_registered; // initially NULL
 154 #endif /* CONFIG_LP_CONSOLE */
 155
 156 #undef LP_DEBUG
 157
 158 /* Bits used to manage claiming the parport device */
 159 #define LP_PREEMPT_REQUEST 1
 160 #define LP_PARPORT_CLAIMED 2
 161
 162 /* --- low-level port access ----------------------------------- */
 163
 164 #define r_dtr(x)        (parport_read_data(lp_table[(x)].dev->port))
 165 #define r_str(x)        (parport_read_status(lp_table[(x)].dev->port))
 166 #define w_ctr(x,y)      do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
 167 #define w_dtr(x,y)      do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
 168
 169 /* Claim the parport or block trying unless we've already claimed it */
 170 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
 171 {
 172         if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
 173                 parport_claim_or_block (this_lp->dev);
 174         }
 175 }
 176
 177 /* Claim the parport or block trying unless we've already claimed it */
 178 static void lp_release_parport(struct lp_struct *this_lp)
 179 {
 180         if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
 181                 parport_release (this_lp->dev);
 182         }
 183 }
 184
 185
 186
 187 static int lp_preempt(void *handle)
 188 {
 189         struct lp_struct *this_lp = (struct lp_struct *)handle;
 190         set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
 191         return (1);
 192 }
 193
 194
 195 /*
 196  * Try to negotiate to a new mode; if unsuccessful negotiate to
 197  * compatibility mode.  Return the mode we ended up in.
 198  */
 199 static int lp_negotiate(struct parport * port, int mode)
 200 {
 201         if (parport_negotiate (port, mode) != 0) {
 202                 mode = IEEE1284_MODE_COMPAT;
 203                 parport_negotiate (port, mode);
 204         }
 205
 206         return (mode);
 207 }
 208
 209 static int lp_reset(int minor)
 210 {
 211         int retval;
 212         lp_claim_parport_or_block (&lp_table[minor]);
 213         w_ctr(minor, LP_PSELECP);
 214         udelay (LP_DELAY);
 215         w_ctr(minor, LP_PSELECP | LP_PINITP);
 216         retval = r_str(minor);
 217         lp_release_parport (&lp_table[minor]);
 218         return retval;
 219 }
 220
 221 static void lp_error (int minor)
 222 {
 223         DEFINE_WAIT(wait);
 224         int polling;
 225
 226         if (LP_F(minor) & LP_ABORT)
 227                 return;
 228
 229         polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
 230         if (polling) lp_release_parport (&lp_table[minor]);
 231         prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
 232         schedule_timeout(LP_TIMEOUT_POLLED);
 233         finish_wait(&lp_table[minor].waitq, &wait);
 234         if (polling) lp_claim_parport_or_block (&lp_table[minor]);
 235         else parport_yield_blocking (lp_table[minor].dev);
 236 }
 237
 238 static int lp_check_status(int minor)
 239 {
 240         int error = 0;
 241         unsigned int last = lp_table[minor].last_error;
 242         unsigned char status = r_str(minor);
 243         if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
 244                 /* No error. */
 245                 last = 0;
 246         else if ((status & LP_POUTPA)) {
 247                 if (last != LP_POUTPA) {
 248                         last = LP_POUTPA;
 249                         printk(KERN_INFO "lp%d out of paper\n", minor);
 250                 }
 251                 error = -ENOSPC;
 252         } else if (!(status & LP_PSELECD)) {
 253                 if (last != LP_PSELECD) {
 254                         last = LP_PSELECD;
 255                         printk(KERN_INFO "lp%d off-line\n", minor);
 256                 }
 257                 error = -EIO;
 258         } else if (!(status & LP_PERRORP)) {
 259                 if (last != LP_PERRORP) {
 260                         last = LP_PERRORP;
 261                         printk(KERN_INFO "lp%d on fire\n", minor);
 262                 }
 263                 error = -EIO;
 264         } else {
 265                 last = 0; /* Come here if LP_CAREFUL is set and no
 266                              errors are reported. */
 267         }
 268
 269         lp_table[minor].last_error = last;
 270
 271         if (last != 0)
 272                 lp_error(minor);
 273
 274         return error;
 275 }
 276
 277 static int lp_wait_ready(int minor, int nonblock)
 278 {
 279         int error = 0;
 280
 281         /* If we're not in compatibility mode, we're ready now! */
 282         if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
 283           return (0);
 284         }
 285
 286         do {
 287                 error = lp_check_status (minor);
 288                 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
 289                         break;
 290                 if (signal_pending (current)) {
 291                         error = -EINTR;
 292                         break;
 293                 }
 294         } while (error);
 295         return error;
 296 }
 297
 298 static ssize_t lp_write(struct file * file, const char __user * buf,
 299                         size_t count, loff_t *ppos)
 300 {
 301         unsigned int minor = iminor(file->f_dentry->d_inode);
 302         struct parport *port = lp_table[minor].dev->port;
 303         char *kbuf = lp_table[minor].lp_buffer;
 304         ssize_t retv = 0;
 305         ssize_t written;
 306         size_t copy_size = count;
 307         int nonblock = ((file->f_flags & O_NONBLOCK) ||
 308                         (LP_F(minor) & LP_ABORT));
 309
 310 #ifdef LP_STATS
 311         if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
 312                 lp_table[minor].runchars = 0;
 313
 314         lp_table[minor].lastcall = jiffies;
 315 #endif
 316
 317         /* Need to copy the data from user-space. */
 318         if (copy_size > LP_BUFFER_SIZE)
 319                 copy_size = LP_BUFFER_SIZE;
 320
 321         if (down_interruptible (&lp_table[minor].port_mutex))
 322                 return -EINTR;
 323
 324         if (copy_from_user (kbuf, buf, copy_size)) {
 325                 retv = -EFAULT;
 326                 goto out_unlock;
 327         }
 328
 329         /* Claim Parport or sleep until it becomes available
 330          */
 331         lp_claim_parport_or_block (&lp_table[minor]);
 332         /* Go to the proper mode. */
 333         lp_table[minor].current_mode = lp_negotiate (port,
 334                                                      lp_table[minor].best_mode);
 335
 336         parport_set_timeout (lp_table[minor].dev,
 337                              (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
 338                               : lp_table[minor].timeout));
 339
 340         if ((retv = lp_wait_ready (minor, nonblock)) == 0)
 341         do {
 342                 /* Write the data. */
 343                 written = parport_write (port, kbuf, copy_size);
 344                 if (written > 0) {
 345                         copy_size -= written;
 346                         count -= written;
 347                         buf  += written;
 348                         retv += written;
 349                 }
 350
 351                 if (signal_pending (current)) {
 352                         if (retv == 0)
 353                                 retv = -EINTR;
 354
 355                         break;
 356                 }
 357
 358                 if (copy_size > 0) {
 359                         /* incomplete write -> check error ! */
 360                         int error;
 361
 362                         parport_negotiate (lp_table[minor].dev->port,
 363                                            IEEE1284_MODE_COMPAT);
 364                         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 365
 366                         error = lp_wait_ready (minor, nonblock);
 367
 368                         if (error) {
 369                                 if (retv == 0)
 370                                         retv = error;
 371                                 break;
 372                         } else if (nonblock) {
 373                                 if (retv == 0)
 374                                         retv = -EAGAIN;
 375                                 break;
 376                         }
 377
 378                         parport_yield_blocking (lp_table[minor].dev);
 379                         lp_table[minor].current_mode
 380                           = lp_negotiate (port,
 381                                           lp_table[minor].best_mode);
 382
 383                 } else if (need_resched())
 384                         schedule ();
 385
 386                 if (count) {
 387                         copy_size = count;
 388                         if (copy_size > LP_BUFFER_SIZE)
 389                                 copy_size = LP_BUFFER_SIZE;
 390
 391                         if (copy_from_user(kbuf, buf, copy_size)) {
 392                                 if (retv == 0)
 393                                         retv = -EFAULT;
 394                                 break;
 395                         }
 396                 }
 397         } while (count > 0);
 398
 399         if (test_and_clear_bit(LP_PREEMPT_REQUEST,
 400                                &lp_table[minor].bits)) {
 401                 printk(KERN_INFO "lp%d releasing parport\n", minor);
 402                 parport_negotiate (lp_table[minor].dev->port,
 403                                    IEEE1284_MODE_COMPAT);
 404                 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 405                 lp_release_parport (&lp_table[minor]);
 406         }
 407 out_unlock:
 408         up (&lp_table[minor].port_mutex);
 409
 410         return retv;
 411 }
 412
 413 #ifdef CONFIG_PARPORT_1284
 414
 415 /* Status readback conforming to ieee1284 */
 416 static ssize_t lp_read(struct file * file, char __user * buf,
 417                        size_t count, loff_t *ppos)
 418 {
 419         DEFINE_WAIT(wait);
 420         unsigned int minor=iminor(file->f_dentry->d_inode);
 421         struct parport *port = lp_table[minor].dev->port;
 422         ssize_t retval = 0;
 423         char *kbuf = lp_table[minor].lp_buffer;
 424         int nonblock = ((file->f_flags & O_NONBLOCK) ||
 425                         (LP_F(minor) & LP_ABORT));
 426
 427         if (count > LP_BUFFER_SIZE)
 428                 count = LP_BUFFER_SIZE;
 429
 430         if (down_interruptible (&lp_table[minor].port_mutex))
 431                 return -EINTR;
 432
 433         lp_claim_parport_or_block (&lp_table[minor]);
 434
 435         parport_set_timeout (lp_table[minor].dev,
 436                              (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
 437                               : lp_table[minor].timeout));
 438
 439         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 440         if (parport_negotiate (lp_table[minor].dev->port,
 441                                IEEE1284_MODE_NIBBLE)) {
 442                 retval = -EIO;
 443                 goto out;
 444         }
 445
 446         while (retval == 0) {
 447                 retval = parport_read (port, kbuf, count);
 448
 449                 if (retval > 0)
 450                         break;
 451
 452                 if (nonblock) {
 453                         retval = -EAGAIN;
 454                         break;
 455                 }
 456
 457                 /* Wait for data. */
 458
 459                 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
 460                         parport_negotiate (lp_table[minor].dev->port,
 461                                            IEEE1284_MODE_COMPAT);
 462                         lp_error (minor);
 463                         if (parport_negotiate (lp_table[minor].dev->port,
 464                                                IEEE1284_MODE_NIBBLE)) {
 465                                 retval = -EIO;
 466                                 goto out;
 467                         }
 468                 } else {
 469                         prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
 470                         schedule_timeout(LP_TIMEOUT_POLLED);
 471                         finish_wait(&lp_table[minor].waitq, &wait);
 472                 }
 473
 474                 if (signal_pending (current)) {
 475                         retval = -ERESTARTSYS;
 476                         break;
 477                 }
 478
 479                 cond_resched ();
 480         }
 481         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 482  out:
 483         lp_release_parport (&lp_table[minor]);
 484
 485         if (retval > 0 && copy_to_user (buf, kbuf, retval))
 486                 retval = -EFAULT;
 487
 488         up (&lp_table[minor].port_mutex);
 489
 490         return retval;
 491 }
 492
 493 #endif /* IEEE 1284 support */
 494
 495 static int lp_open(struct inode * inode, struct file * file)
 496 {
 497         unsigned int minor = iminor(inode);
 498
 499         if (minor >= LP_NO)
 500                 return -ENXIO;
 501         if ((LP_F(minor) & LP_EXIST) == 0)
 502                 return -ENXIO;
 503         if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
 504                 return -EBUSY;
 505
 506         /* If ABORTOPEN is set and the printer is offline or out of paper,
 507            we may still want to open it to perform ioctl()s.  Therefore we
 508            have commandeered O_NONBLOCK, even though it is being used in
 509            a non-standard manner.  This is strictly a Linux hack, and
 510            should most likely only ever be used by the tunelp application. */
 511         if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
 512                 int status;
 513                 lp_claim_parport_or_block (&lp_table[minor]);
 514                 status = r_str(minor);
 515                 lp_release_parport (&lp_table[minor]);
 516                 if (status & LP_POUTPA) {
 517                         printk(KERN_INFO "lp%d out of paper\n", minor);
 518                         LP_F(minor) &= ~LP_BUSY;
 519                         return -ENOSPC;
 520                 } else if (!(status & LP_PSELECD)) {
 521                         printk(KERN_INFO "lp%d off-line\n", minor);
 522                         LP_F(minor) &= ~LP_BUSY;
 523                         return -EIO;
 524                 } else if (!(status & LP_PERRORP)) {
 525                         printk(KERN_ERR "lp%d printer error\n", minor);
 526                         LP_F(minor) &= ~LP_BUSY;
 527                         return -EIO;
 528                 }
 529         }
 530         lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
 531         if (!lp_table[minor].lp_buffer) {
 532                 LP_F(minor) &= ~LP_BUSY;
 533                 return -ENOMEM;
 534         }
 535         /* Determine if the peripheral supports ECP mode */
 536         lp_claim_parport_or_block (&lp_table[minor]);
 537         if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
 538              !parport_negotiate (lp_table[minor].dev->port,
 539                                  IEEE1284_MODE_ECP)) {
 540                 printk (KERN_INFO "lp%d: ECP mode\n", minor);
 541                 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
 542         } else {
 543                 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
 544         }
 545         /* Leave peripheral in compatibility mode */
 546         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 547         lp_release_parport (&lp_table[minor]);
 548         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 549         return 0;
 550 }
 551
 552 static int lp_release(struct inode * inode, struct file * file)
 553 {
 554         unsigned int minor = iminor(inode);
 555
 556         lp_claim_parport_or_block (&lp_table[minor]);
 557         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 558         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 559         lp_release_parport (&lp_table[minor]);
 560         kfree(lp_table[minor].lp_buffer);
 561         lp_table[minor].lp_buffer = NULL;
 562         LP_F(minor) &= ~LP_BUSY;
 563         return 0;
 564 }
 565
 566 static int lp_ioctl(struct inode *inode, struct file *file,
 567                     unsigned int cmd, unsigned long arg)
 568 {
 569         unsigned int minor = iminor(inode);
 570         int status;
 571         int retval = 0;
 572         void __user *argp = (void __user *)arg;
 573
 574 #ifdef LP_DEBUG
 575         printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
 576 #endif
 577         if (minor >= LP_NO)
 578                 return -ENODEV;
 579         if ((LP_F(minor) & LP_EXIST) == 0)
 580                 return -ENODEV;
 581         switch ( cmd ) {
 582                 struct timeval par_timeout;
 583                 long to_jiffies;
 584
 585                 case LPTIME:
 586                         LP_TIME(minor) = arg * HZ/100;
 587                         break;
 588                 case LPCHAR:
 589                         LP_CHAR(minor) = arg;
 590                         break;
 591                 case LPABORT:
 592                         if (arg)
 593                                 LP_F(minor) |= LP_ABORT;
 594                         else
 595                                 LP_F(minor) &= ~LP_ABORT;
 596                         break;
 597                 case LPABORTOPEN:
 598                         if (arg)
 599                                 LP_F(minor) |= LP_ABORTOPEN;
 600                         else
 601                                 LP_F(minor) &= ~LP_ABORTOPEN;
 602                         break;
 603                 case LPCAREFUL:
 604                         if (arg)
 605                                 LP_F(minor) |= LP_CAREFUL;
 606                         else
 607                                 LP_F(minor) &= ~LP_CAREFUL;
 608                         break;
 609                 case LPWAIT:
 610                         LP_WAIT(minor) = arg;
 611                         break;
 612                 case LPSETIRQ:
 613                         return -EINVAL;
 614                         break;
 615                 case LPGETIRQ:
 616                         if (copy_to_user(argp, &LP_IRQ(minor),
 617                                         sizeof(int)))
 618                                 return -EFAULT;
 619                         break;
 620                 case LPGETSTATUS:
 621                         lp_claim_parport_or_block (&lp_table[minor]);
 622                         status = r_str(minor);
 623                         lp_release_parport (&lp_table[minor]);
 624
 625                         if (copy_to_user(argp, &status, sizeof(int)))
 626                                 return -EFAULT;
 627                         break;
 628                 case LPRESET:
 629                         lp_reset(minor);
 630                         break;
 631 #ifdef LP_STATS
 632                 case LPGETSTATS:
 633                         if (copy_to_user(argp, &LP_STAT(minor),
 634                                         sizeof(struct lp_stats)))
 635                                 return -EFAULT;
 636                         if (capable(CAP_SYS_ADMIN))
 637                                 memset(&LP_STAT(minor), 0,
 638                                                 sizeof(struct lp_stats));
 639                         break;
 640 #endif
 641                 case LPGETFLAGS:
 642                         status = LP_F(minor);
 643                         if (copy_to_user(argp, &status, sizeof(int)))
 644                                 return -EFAULT;
 645                         break;
 646
 647                 case LPSETTIMEOUT:
 648                         if (copy_from_user (&par_timeout, argp,
 649                                             sizeof (struct timeval))) {
 650                                 return -EFAULT;
 651                         }
 652                         /* Convert to jiffies, place in lp_table */
 653                         if ((par_timeout.tv_sec < 0) ||
 654                             (par_timeout.tv_usec < 0)) {
 655                                 return -EINVAL;
 656                         }
 657                         to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
 658                         to_jiffies += par_timeout.tv_sec * (long) HZ;
 659                         if (to_jiffies <= 0) {
 660                                 return -EINVAL;
 661                         }
 662                         lp_table[minor].timeout = to_jiffies;
 663                         break;
 664
 665                 default:
 666                         retval = -EINVAL;
 667         }
 668         return retval;
 669 }
 670
 671 static struct file_operations lp_fops = {
 672         .owner          = THIS_MODULE,
 673         .write          = lp_write,
 674         .ioctl          = lp_ioctl,
 675         .open           = lp_open,
 676         .release        = lp_release,
 677 #ifdef CONFIG_PARPORT_1284
 678         .read           = lp_read,
 679 #endif
 680 };
 681
 682 /* --- support for console on the line printer ----------------- */
 683
 684 #ifdef CONFIG_LP_CONSOLE
 685
 686 #define CONSOLE_LP 0
 687
 688 /* If the printer is out of paper, we can either lose the messages or
 689  * stall until the printer is happy again.  Define CONSOLE_LP_STRICT
 690  * non-zero to get the latter behaviour. */
 691 #define CONSOLE_LP_STRICT 1
 692
 693 /* The console must be locked when we get here. */
 694
 695 static void lp_console_write (struct console *co, const char *s,
 696                               unsigned count)
 697 {
 698         struct pardevice *dev = lp_table[CONSOLE_LP].dev;
 699         struct parport *port = dev->port;
 700         ssize_t written;
 701
 702         if (parport_claim (dev))
 703                 /* Nothing we can do. */
 704                 return;
 705
 706         parport_set_timeout (dev, 0);
 707
 708         /* Go to compatibility mode. */
 709         parport_negotiate (port, IEEE1284_MODE_COMPAT);
 710
 711         do {
 712                 /* Write the data, converting LF->CRLF as we go. */
 713                 ssize_t canwrite = count;
 714                 char *lf = memchr (s, '\n', count);
 715                 if (lf)
 716                         canwrite = lf - s;
 717
 718                 if (canwrite > 0) {
 719                         written = parport_write (port, s, canwrite);
 720
 721                         if (written <= 0)
 722                                 continue;
 723
 724                         s += written;
 725                         count -= written;
 726                         canwrite -= written;
 727                 }
 728
 729                 if (lf && canwrite <= 0) {
 730                         const char *crlf = "\r\n";
 731                         int i = 2;
 732
 733                         /* Dodge the original '\n', and put '\r\n' instead. */
 734                         s++;
 735                         count--;
 736                         do {
 737                                 written = parport_write (port, crlf, i);
 738                                 if (written > 0)
 739                                         i -= written, crlf += written;
 740                         } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
 741                 }
 742         } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
 743
 744         parport_release (dev);
 745 }
 746
 747 static struct console lpcons = {
 748         .name           = "lp",
 749         .write          = lp_console_write,
 750         .flags          = CON_PRINTBUFFER,
 751 };
 752
 753 #endif /* console on line printer */
 754
 755 /* --- initialisation code ------------------------------------- */
 756
 757 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
 758 static char *parport[LP_NO] = { NULL,  };
 759 static int reset = 0;
 760
 761 module_param_array(parport, charp, NULL, 0);
 762 module_param(reset, bool, 0);
 763
 764 #ifndef MODULE
 765 static int __init lp_setup (char *str)
 766 {
 767         static int parport_ptr; // initially zero
 768         int x;
 769
 770         if (get_option (&str, &x)) {
 771                 if (x == 0) {
 772                         /* disable driver on "lp=" or "lp=0" */
 773                         parport_nr[0] = LP_PARPORT_OFF;
 774                 } else {
 775                         printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
 776                         return 0;
 777                 }
 778         } else if (!strncmp(str, "parport", 7)) {
 779                 int n = simple_strtoul(str+7, NULL, 10);
 780                 if (parport_ptr < LP_NO)
 781                         parport_nr[parport_ptr++] = n;
 782                 else
 783                         printk(KERN_INFO "lp: too many ports, %s ignored.\n",
 784                                str);
 785         } else if (!strcmp(str, "auto")) {
 786                 parport_nr[0] = LP_PARPORT_AUTO;
 787         } else if (!strcmp(str, "none")) {
 788                 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
 789         } else if (!strcmp(str, "reset")) {
 790                 reset = 1;
 791         }
 792         return 1;
 793 }
 794 #endif
 795
 796 static int lp_register(int nr, struct parport *port)
 797 {
 798         lp_table[nr].dev = parport_register_device(port, "lp",
 799                                                    lp_preempt, NULL, NULL, 0,
 800                                                    (void *) &lp_table[nr]);
 801         if (lp_table[nr].dev == NULL)
 802                 return 1;
 803         lp_table[nr].flags |= LP_EXIST;
 804
 805         if (reset)
 806                 lp_reset(nr);
 807
 808         class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL,
 809                                 "lp%d", nr);
 810         devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO,
 811                         "printers/%d", nr);
 812
 813         printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
 814                (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
 815
 816 #ifdef CONFIG_LP_CONSOLE
 817         if (!nr) {
 818                 if (port->modes & PARPORT_MODE_SAFEININT) {
 819                         register_console (&lpcons);
 820                         console_registered = port;
 821                         printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
 822                 } else
 823                         printk (KERN_ERR "lp%d: cannot run console on %s\n",
 824                                 CONSOLE_LP, port->name);
 825         }
 826 #endif
 827
 828         return 0;
 829 }
 830
 831 static void lp_attach (struct parport *port)
 832 {
 833         unsigned int i;
 834
 835         switch (parport_nr[0])
 836         {
 837         case LP_PARPORT_UNSPEC:
 838         case LP_PARPORT_AUTO:
 839                 if (parport_nr[0] == LP_PARPORT_AUTO &&
 840                     port->probe_info[0].class != PARPORT_CLASS_PRINTER)
 841                         return;
 842                 if (lp_count == LP_NO) {
 843                         printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
 844                         return;
 845                 }
 846                 if (!lp_register(lp_count, port))
 847                         lp_count++;
 848                 break;
 849
 850         default:
 851                 for (i = 0; i < LP_NO; i++) {
 852                         if (port->number == parport_nr[i]) {
 853                                 if (!lp_register(i, port))
 854                                         lp_count++;
 855                                 break;
 856                         }
 857                 }
 858                 break;
 859         }
 860 }
 861
 862 static void lp_detach (struct parport *port)
 863 {
 864         /* Write this some day. */
 865 #ifdef CONFIG_LP_CONSOLE
 866         if (console_registered == port) {
 867                 unregister_console (&lpcons);
 868                 console_registered = NULL;
 869         }
 870 #endif /* CONFIG_LP_CONSOLE */
 871 }
 872
 873 static struct parport_driver lp_driver = {
 874         .name = "lp",
 875         .attach = lp_attach,
 876         .detach = lp_detach,
 877 };
 878
 879 static int __init lp_init (void)
 880 {
 881         int i, err = 0;
 882
 883         if (parport_nr[0] == LP_PARPORT_OFF)
 884                 return 0;
 885
 886         for (i = 0; i < LP_NO; i++) {
 887                 lp_table[i].dev = NULL;
 888                 lp_table[i].flags = 0;
 889                 lp_table[i].chars = LP_INIT_CHAR;
 890                 lp_table[i].time = LP_INIT_TIME;
 891                 lp_table[i].wait = LP_INIT_WAIT;
 892                 lp_table[i].lp_buffer = NULL;
 893 #ifdef LP_STATS
 894                 lp_table[i].lastcall = 0;
 895                 lp_table[i].runchars = 0;
 896                 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
 897 #endif
 898                 lp_table[i].last_error = 0;
 899                 init_waitqueue_head (&lp_table[i].waitq);
 900                 init_waitqueue_head (&lp_table[i].dataq);
 901                 init_MUTEX (&lp_table[i].port_mutex);
 902                 lp_table[i].timeout = 10 * HZ;
 903         }
 904
 905         if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
 906                 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
 907                 return -EIO;
 908         }
 909
 910         devfs_mk_dir("printers");
 911         lp_class = class_create(THIS_MODULE, "printer");
 912         if (IS_ERR(lp_class)) {
 913                 err = PTR_ERR(lp_class);
 914                 goto out_devfs;
 915         }
 916
 917         if (parport_register_driver (&lp_driver)) {
 918                 printk (KERN_ERR "lp: unable to register with parport\n");
 919                 err = -EIO;
 920                 goto out_class;
 921         }
 922
 923         if (!lp_count) {
 924                 printk (KERN_INFO "lp: driver loaded but no devices found\n");
 925 #ifndef CONFIG_PARPORT_1284
 926                 if (parport_nr[0] == LP_PARPORT_AUTO)
 927                         printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
 928 #endif
 929         }
 930
 931         return 0;
 932
 933 out_class:
 934         class_destroy(lp_class);
 935 out_devfs:
 936         devfs_remove("printers");
 937         unregister_chrdev(LP_MAJOR, "lp");
 938         return err;
 939 }
 940
 941 static int __init lp_init_module (void)
 942 {
 943         if (parport[0]) {
 944                 /* The user gave some parameters.  Let's see what they were.  */
 945                 if (!strncmp(parport[0], "auto", 4))
 946                         parport_nr[0] = LP_PARPORT_AUTO;
 947                 else {
 948                         int n;
 949                         for (n = 0; n < LP_NO && parport[n]; n++) {
 950                                 if (!strncmp(parport[n], "none", 4))
 951                                         parport_nr[n] = LP_PARPORT_NONE;
 952                                 else {
 953                                         char *ep;
 954                                         unsigned long r = simple_strtoul(parport[n], &ep, 0);
 955                                         if (ep != parport[n])
 956                                                 parport_nr[n] = r;
 957                                         else {
 958                                                 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
 959                                                 return -ENODEV;
 960                                         }
 961                                 }
 962                         }
 963                 }
 964         }
 965
 966         return lp_init();
 967 }
 968
 969 static void lp_cleanup_module (void)
 970 {
 971         unsigned int offset;
 972
 973         parport_unregister_driver (&lp_driver);
 974
 975 #ifdef CONFIG_LP_CONSOLE
 976         unregister_console (&lpcons);
 977 #endif
 978
 979         unregister_chrdev(LP_MAJOR, "lp");
 980         for (offset = 0; offset < LP_NO; offset++) {
 981                 if (lp_table[offset].dev == NULL)
 982                         continue;
 983                 parport_unregister_device(lp_table[offset].dev);
 984                 devfs_remove("printers/%d", offset);
 985                 class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
 986         }
 987         devfs_remove("printers");
 988         class_destroy(lp_class);
 989 }
 990
 991 __setup("lp=", lp_setup);
 992 module_init(lp_init_module);
 993 module_exit(lp_cleanup_module);
 994
 995 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
 996 MODULE_LICENSE("GPL");