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/errno.h>
 118 #include <linux/kernel.h>
 119 #include <linux/major.h>
 120 #include <linux/sched.h>
 121 #include <linux/smp_lock.h>
 122 #include <linux/slab.h>
 123 #include <linux/fcntl.h>
 124 #include <linux/delay.h>
 125 #include <linux/poll.h>
 126 #include <linux/console.h>
 127 #include <linux/device.h>
 128 #include <linux/wait.h>
 129 #include <linux/jiffies.h>
 130
 131 #include <linux/parport.h>
 132 #undef LP_STATS
 133 #include <linux/lp.h>
 134
 135 #include <asm/irq.h>
 136 #include <asm/uaccess.h>
 137 #include <asm/system.h>
 138
 139 /* if you have more than 8 printers, remember to increase LP_NO */
 140 #define LP_NO 8
 141
 142 /* ROUND_UP macro from fs/select.c */
 143 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
 144
 145 static struct lp_struct lp_table[LP_NO];
 146
 147 static unsigned int lp_count = 0;
 148 static struct class *lp_class;
 149
 150 #ifdef CONFIG_LP_CONSOLE
 151 static struct parport *console_registered; // initially NULL
 152 #endif /* CONFIG_LP_CONSOLE */
 153
 154 #undef LP_DEBUG
 155
 156 /* Bits used to manage claiming the parport device */
 157 #define LP_PREEMPT_REQUEST 1
 158 #define LP_PARPORT_CLAIMED 2
 159
 160 /* --- low-level port access ----------------------------------- */
 161
 162 #define r_dtr(x)        (parport_read_data(lp_table[(x)].dev->port))
 163 #define r_str(x)        (parport_read_status(lp_table[(x)].dev->port))
 164 #define w_ctr(x,y)      do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
 165 #define w_dtr(x,y)      do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
 166
 167 /* Claim the parport or block trying unless we've already claimed it */
 168 static void lp_claim_parport_or_block(struct lp_struct *this_lp)
 169 {
 170         if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
 171                 parport_claim_or_block (this_lp->dev);
 172         }
 173 }
 174
 175 /* Claim the parport or block trying unless we've already claimed it */
 176 static void lp_release_parport(struct lp_struct *this_lp)
 177 {
 178         if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
 179                 parport_release (this_lp->dev);
 180         }
 181 }
 182
 183
 184
 185 static int lp_preempt(void *handle)
 186 {
 187         struct lp_struct *this_lp = (struct lp_struct *)handle;
 188         set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
 189         return (1);
 190 }
 191
 192
 193 /*
 194  * Try to negotiate to a new mode; if unsuccessful negotiate to
 195  * compatibility mode.  Return the mode we ended up in.
 196  */
 197 static int lp_negotiate(struct parport * port, int mode)
 198 {
 199         if (parport_negotiate (port, mode) != 0) {
 200                 mode = IEEE1284_MODE_COMPAT;
 201                 parport_negotiate (port, mode);
 202         }
 203
 204         return (mode);
 205 }
 206
 207 static int lp_reset(int minor)
 208 {
 209         int retval;
 210         lp_claim_parport_or_block (&lp_table[minor]);
 211         w_ctr(minor, LP_PSELECP);
 212         udelay (LP_DELAY);
 213         w_ctr(minor, LP_PSELECP | LP_PINITP);
 214         retval = r_str(minor);
 215         lp_release_parport (&lp_table[minor]);
 216         return retval;
 217 }
 218
 219 static void lp_error (int minor)
 220 {
 221         DEFINE_WAIT(wait);
 222         int polling;
 223
 224         if (LP_F(minor) & LP_ABORT)
 225                 return;
 226
 227         polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
 228         if (polling) lp_release_parport (&lp_table[minor]);
 229         prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
 230         schedule_timeout(LP_TIMEOUT_POLLED);
 231         finish_wait(&lp_table[minor].waitq, &wait);
 232         if (polling) lp_claim_parport_or_block (&lp_table[minor]);
 233         else parport_yield_blocking (lp_table[minor].dev);
 234 }
 235
 236 static int lp_check_status(int minor)
 237 {
 238         int error = 0;
 239         unsigned int last = lp_table[minor].last_error;
 240         unsigned char status = r_str(minor);
 241         if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
 242                 /* No error. */
 243                 last = 0;
 244         else if ((status & LP_POUTPA)) {
 245                 if (last != LP_POUTPA) {
 246                         last = LP_POUTPA;
 247                         printk(KERN_INFO "lp%d out of paper\n", minor);
 248                 }
 249                 error = -ENOSPC;
 250         } else if (!(status & LP_PSELECD)) {
 251                 if (last != LP_PSELECD) {
 252                         last = LP_PSELECD;
 253                         printk(KERN_INFO "lp%d off-line\n", minor);
 254                 }
 255                 error = -EIO;
 256         } else if (!(status & LP_PERRORP)) {
 257                 if (last != LP_PERRORP) {
 258                         last = LP_PERRORP;
 259                         printk(KERN_INFO "lp%d on fire\n", minor);
 260                 }
 261                 error = -EIO;
 262         } else {
 263                 last = 0; /* Come here if LP_CAREFUL is set and no
 264                              errors are reported. */
 265         }
 266
 267         lp_table[minor].last_error = last;
 268
 269         if (last != 0)
 270                 lp_error(minor);
 271
 272         return error;
 273 }
 274
 275 static int lp_wait_ready(int minor, int nonblock)
 276 {
 277         int error = 0;
 278
 279         /* If we're not in compatibility mode, we're ready now! */
 280         if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
 281           return (0);
 282         }
 283
 284         do {
 285                 error = lp_check_status (minor);
 286                 if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
 287                         break;
 288                 if (signal_pending (current)) {
 289                         error = -EINTR;
 290                         break;
 291                 }
 292         } while (error);
 293         return error;
 294 }
 295
 296 static ssize_t lp_write(struct file * file, const char __user * buf,
 297                         size_t count, loff_t *ppos)
 298 {
 299         unsigned int minor = iminor(file->f_path.dentry->d_inode);
 300         struct parport *port = lp_table[minor].dev->port;
 301         char *kbuf = lp_table[minor].lp_buffer;
 302         ssize_t retv = 0;
 303         ssize_t written;
 304         size_t copy_size = count;
 305         int nonblock = ((file->f_flags & O_NONBLOCK) ||
 306                         (LP_F(minor) & LP_ABORT));
 307
 308 #ifdef LP_STATS
 309         if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
 310                 lp_table[minor].runchars = 0;
 311
 312         lp_table[minor].lastcall = jiffies;
 313 #endif
 314
 315         /* Need to copy the data from user-space. */
 316         if (copy_size > LP_BUFFER_SIZE)
 317                 copy_size = LP_BUFFER_SIZE;
 318
 319         if (down_interruptible (&lp_table[minor].port_mutex))
 320                 return -EINTR;
 321
 322         if (copy_from_user (kbuf, buf, copy_size)) {
 323                 retv = -EFAULT;
 324                 goto out_unlock;
 325         }
 326
 327         /* Claim Parport or sleep until it becomes available
 328          */
 329         lp_claim_parport_or_block (&lp_table[minor]);
 330         /* Go to the proper mode. */
 331         lp_table[minor].current_mode = lp_negotiate (port,
 332                                                      lp_table[minor].best_mode);
 333
 334         parport_set_timeout (lp_table[minor].dev,
 335                              (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
 336                               : lp_table[minor].timeout));
 337
 338         if ((retv = lp_wait_ready (minor, nonblock)) == 0)
 339         do {
 340                 /* Write the data. */
 341                 written = parport_write (port, kbuf, copy_size);
 342                 if (written > 0) {
 343                         copy_size -= written;
 344                         count -= written;
 345                         buf  += written;
 346                         retv += written;
 347                 }
 348
 349                 if (signal_pending (current)) {
 350                         if (retv == 0)
 351                                 retv = -EINTR;
 352
 353                         break;
 354                 }
 355
 356                 if (copy_size > 0) {
 357                         /* incomplete write -> check error ! */
 358                         int error;
 359
 360                         parport_negotiate (lp_table[minor].dev->port,
 361                                            IEEE1284_MODE_COMPAT);
 362                         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 363
 364                         error = lp_wait_ready (minor, nonblock);
 365
 366                         if (error) {
 367                                 if (retv == 0)
 368                                         retv = error;
 369                                 break;
 370                         } else if (nonblock) {
 371                                 if (retv == 0)
 372                                         retv = -EAGAIN;
 373                                 break;
 374                         }
 375
 376                         parport_yield_blocking (lp_table[minor].dev);
 377                         lp_table[minor].current_mode
 378                           = lp_negotiate (port,
 379                                           lp_table[minor].best_mode);
 380
 381                 } else if (need_resched())
 382                         schedule ();
 383
 384                 if (count) {
 385                         copy_size = count;
 386                         if (copy_size > LP_BUFFER_SIZE)
 387                                 copy_size = LP_BUFFER_SIZE;
 388
 389                         if (copy_from_user(kbuf, buf, copy_size)) {
 390                                 if (retv == 0)
 391                                         retv = -EFAULT;
 392                                 break;
 393                         }
 394                 }
 395         } while (count > 0);
 396
 397         if (test_and_clear_bit(LP_PREEMPT_REQUEST,
 398                                &lp_table[minor].bits)) {
 399                 printk(KERN_INFO "lp%d releasing parport\n", minor);
 400                 parport_negotiate (lp_table[minor].dev->port,
 401                                    IEEE1284_MODE_COMPAT);
 402                 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 403                 lp_release_parport (&lp_table[minor]);
 404         }
 405 out_unlock:
 406         up (&lp_table[minor].port_mutex);
 407
 408         return retv;
 409 }
 410
 411 #ifdef CONFIG_PARPORT_1284
 412
 413 /* Status readback conforming to ieee1284 */
 414 static ssize_t lp_read(struct file * file, char __user * buf,
 415                        size_t count, loff_t *ppos)
 416 {
 417         DEFINE_WAIT(wait);
 418         unsigned int minor=iminor(file->f_path.dentry->d_inode);
 419         struct parport *port = lp_table[minor].dev->port;
 420         ssize_t retval = 0;
 421         char *kbuf = lp_table[minor].lp_buffer;
 422         int nonblock = ((file->f_flags & O_NONBLOCK) ||
 423                         (LP_F(minor) & LP_ABORT));
 424
 425         if (count > LP_BUFFER_SIZE)
 426                 count = LP_BUFFER_SIZE;
 427
 428         if (down_interruptible (&lp_table[minor].port_mutex))
 429                 return -EINTR;
 430
 431         lp_claim_parport_or_block (&lp_table[minor]);
 432
 433         parport_set_timeout (lp_table[minor].dev,
 434                              (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
 435                               : lp_table[minor].timeout));
 436
 437         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 438         if (parport_negotiate (lp_table[minor].dev->port,
 439                                IEEE1284_MODE_NIBBLE)) {
 440                 retval = -EIO;
 441                 goto out;
 442         }
 443
 444         while (retval == 0) {
 445                 retval = parport_read (port, kbuf, count);
 446
 447                 if (retval > 0)
 448                         break;
 449
 450                 if (nonblock) {
 451                         retval = -EAGAIN;
 452                         break;
 453                 }
 454
 455                 /* Wait for data. */
 456
 457                 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
 458                         parport_negotiate (lp_table[minor].dev->port,
 459                                            IEEE1284_MODE_COMPAT);
 460                         lp_error (minor);
 461                         if (parport_negotiate (lp_table[minor].dev->port,
 462                                                IEEE1284_MODE_NIBBLE)) {
 463                                 retval = -EIO;
 464                                 goto out;
 465                         }
 466                 } else {
 467                         prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
 468                         schedule_timeout(LP_TIMEOUT_POLLED);
 469                         finish_wait(&lp_table[minor].waitq, &wait);
 470                 }
 471
 472                 if (signal_pending (current)) {
 473                         retval = -ERESTARTSYS;
 474                         break;
 475                 }
 476
 477                 cond_resched ();
 478         }
 479         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 480  out:
 481         lp_release_parport (&lp_table[minor]);
 482
 483         if (retval > 0 && copy_to_user (buf, kbuf, retval))
 484                 retval = -EFAULT;
 485
 486         up (&lp_table[minor].port_mutex);
 487
 488         return retval;
 489 }
 490
 491 #endif /* IEEE 1284 support */
 492
 493 static int lp_open(struct inode * inode, struct file * file)
 494 {
 495         unsigned int minor = iminor(inode);
 496
 497         if (minor >= LP_NO)
 498                 return -ENXIO;
 499         if ((LP_F(minor) & LP_EXIST) == 0)
 500                 return -ENXIO;
 501         if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
 502                 return -EBUSY;
 503
 504         /* If ABORTOPEN is set and the printer is offline or out of paper,
 505            we may still want to open it to perform ioctl()s.  Therefore we
 506            have commandeered O_NONBLOCK, even though it is being used in
 507            a non-standard manner.  This is strictly a Linux hack, and
 508            should most likely only ever be used by the tunelp application. */
 509         if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
 510                 int status;
 511                 lp_claim_parport_or_block (&lp_table[minor]);
 512                 status = r_str(minor);
 513                 lp_release_parport (&lp_table[minor]);
 514                 if (status & LP_POUTPA) {
 515                         printk(KERN_INFO "lp%d out of paper\n", minor);
 516                         LP_F(minor) &= ~LP_BUSY;
 517                         return -ENOSPC;
 518                 } else if (!(status & LP_PSELECD)) {
 519                         printk(KERN_INFO "lp%d off-line\n", minor);
 520                         LP_F(minor) &= ~LP_BUSY;
 521                         return -EIO;
 522                 } else if (!(status & LP_PERRORP)) {
 523                         printk(KERN_ERR "lp%d printer error\n", minor);
 524                         LP_F(minor) &= ~LP_BUSY;
 525                         return -EIO;
 526                 }
 527         }
 528         lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
 529         if (!lp_table[minor].lp_buffer) {
 530                 LP_F(minor) &= ~LP_BUSY;
 531                 return -ENOMEM;
 532         }
 533         /* Determine if the peripheral supports ECP mode */
 534         lp_claim_parport_or_block (&lp_table[minor]);
 535         if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
 536              !parport_negotiate (lp_table[minor].dev->port,
 537                                  IEEE1284_MODE_ECP)) {
 538                 printk (KERN_INFO "lp%d: ECP mode\n", minor);
 539                 lp_table[minor].best_mode = IEEE1284_MODE_ECP;
 540         } else {
 541                 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
 542         }
 543         /* Leave peripheral in compatibility mode */
 544         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 545         lp_release_parport (&lp_table[minor]);
 546         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 547         return 0;
 548 }
 549
 550 static int lp_release(struct inode * inode, struct file * file)
 551 {
 552         unsigned int minor = iminor(inode);
 553
 554         lp_claim_parport_or_block (&lp_table[minor]);
 555         parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
 556         lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
 557         lp_release_parport (&lp_table[minor]);
 558         kfree(lp_table[minor].lp_buffer);
 559         lp_table[minor].lp_buffer = NULL;
 560         LP_F(minor) &= ~LP_BUSY;
 561         return 0;
 562 }
 563
 564 static int lp_ioctl(struct inode *inode, struct file *file,
 565                     unsigned int cmd, unsigned long arg)
 566 {
 567         unsigned int minor = iminor(inode);
 568         int status;
 569         int retval = 0;
 570         void __user *argp = (void __user *)arg;
 571
 572 #ifdef LP_DEBUG
 573         printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
 574 #endif
 575         if (minor >= LP_NO)
 576                 return -ENODEV;
 577         if ((LP_F(minor) & LP_EXIST) == 0)
 578                 return -ENODEV;
 579         switch ( cmd ) {
 580                 struct timeval par_timeout;
 581                 long to_jiffies;
 582
 583                 case LPTIME:
 584                         LP_TIME(minor) = arg * HZ/100;
 585                         break;
 586                 case LPCHAR:
 587                         LP_CHAR(minor) = arg;
 588                         break;
 589                 case LPABORT:
 590                         if (arg)
 591                                 LP_F(minor) |= LP_ABORT;
 592                         else
 593                                 LP_F(minor) &= ~LP_ABORT;
 594                         break;
 595                 case LPABORTOPEN:
 596                         if (arg)
 597                                 LP_F(minor) |= LP_ABORTOPEN;
 598                         else
 599                                 LP_F(minor) &= ~LP_ABORTOPEN;
 600                         break;
 601                 case LPCAREFUL:
 602                         if (arg)
 603                                 LP_F(minor) |= LP_CAREFUL;
 604                         else
 605                                 LP_F(minor) &= ~LP_CAREFUL;
 606                         break;
 607                 case LPWAIT:
 608                         LP_WAIT(minor) = arg;
 609                         break;
 610                 case LPSETIRQ:
 611                         return -EINVAL;
 612                         break;
 613                 case LPGETIRQ:
 614                         if (copy_to_user(argp, &LP_IRQ(minor),
 615                                         sizeof(int)))
 616                                 return -EFAULT;
 617                         break;
 618                 case LPGETSTATUS:
 619                         lp_claim_parport_or_block (&lp_table[minor]);
 620                         status = r_str(minor);
 621                         lp_release_parport (&lp_table[minor]);
 622
 623                         if (copy_to_user(argp, &status, sizeof(int)))
 624                                 return -EFAULT;
 625                         break;
 626                 case LPRESET:
 627                         lp_reset(minor);
 628                         break;
 629 #ifdef LP_STATS
 630                 case LPGETSTATS:
 631                         if (copy_to_user(argp, &LP_STAT(minor),
 632                                         sizeof(struct lp_stats)))
 633                                 return -EFAULT;
 634                         if (capable(CAP_SYS_ADMIN))
 635                                 memset(&LP_STAT(minor), 0,
 636                                                 sizeof(struct lp_stats));
 637                         break;
 638 #endif
 639                 case LPGETFLAGS:
 640                         status = LP_F(minor);
 641                         if (copy_to_user(argp, &status, sizeof(int)))
 642                                 return -EFAULT;
 643                         break;
 644
 645                 case LPSETTIMEOUT:
 646                         if (copy_from_user (&par_timeout, argp,
 647                                             sizeof (struct timeval))) {
 648                                 return -EFAULT;
 649                         }
 650                         /* Convert to jiffies, place in lp_table */
 651                         if ((par_timeout.tv_sec < 0) ||
 652                             (par_timeout.tv_usec < 0)) {
 653                                 return -EINVAL;
 654                         }
 655                         to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
 656                         to_jiffies += par_timeout.tv_sec * (long) HZ;
 657                         if (to_jiffies <= 0) {
 658                                 return -EINVAL;
 659                         }
 660                         lp_table[minor].timeout = to_jiffies;
 661                         break;
 662
 663                 default:
 664                         retval = -EINVAL;
 665         }
 666         return retval;
 667 }
 668
 669 static const struct file_operations lp_fops = {
 670         .owner          = THIS_MODULE,
 671         .write          = lp_write,
 672         .ioctl          = lp_ioctl,
 673         .open           = lp_open,
 674         .release        = lp_release,
 675 #ifdef CONFIG_PARPORT_1284
 676         .read           = lp_read,
 677 #endif
 678 };
 679
 680 /* --- support for console on the line printer ----------------- */
 681
 682 #ifdef CONFIG_LP_CONSOLE
 683
 684 #define CONSOLE_LP 0
 685
 686 /* If the printer is out of paper, we can either lose the messages or
 687  * stall until the printer is happy again.  Define CONSOLE_LP_STRICT
 688  * non-zero to get the latter behaviour. */
 689 #define CONSOLE_LP_STRICT 1
 690
 691 /* The console must be locked when we get here. */
 692
 693 static void lp_console_write (struct console *co, const char *s,
 694                               unsigned count)
 695 {
 696         struct pardevice *dev = lp_table[CONSOLE_LP].dev;
 697         struct parport *port = dev->port;
 698         ssize_t written;
 699
 700         if (parport_claim (dev))
 701                 /* Nothing we can do. */
 702                 return;
 703
 704         parport_set_timeout (dev, 0);
 705
 706         /* Go to compatibility mode. */
 707         parport_negotiate (port, IEEE1284_MODE_COMPAT);
 708
 709         do {
 710                 /* Write the data, converting LF->CRLF as we go. */
 711                 ssize_t canwrite = count;
 712                 char *lf = memchr (s, '\n', count);
 713                 if (lf)
 714                         canwrite = lf - s;
 715
 716                 if (canwrite > 0) {
 717                         written = parport_write (port, s, canwrite);
 718
 719                         if (written <= 0)
 720                                 continue;
 721
 722                         s += written;
 723                         count -= written;
 724                         canwrite -= written;
 725                 }
 726
 727                 if (lf && canwrite <= 0) {
 728                         const char *crlf = "\r\n";
 729                         int i = 2;
 730
 731                         /* Dodge the original '\n', and put '\r\n' instead. */
 732                         s++;
 733                         count--;
 734                         do {
 735                                 written = parport_write (port, crlf, i);
 736                                 if (written > 0)
 737                                         i -= written, crlf += written;
 738                         } while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
 739                 }
 740         } while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
 741
 742         parport_release (dev);
 743 }
 744
 745 static struct console lpcons = {
 746         .name           = "lp",
 747         .write          = lp_console_write,
 748         .flags          = CON_PRINTBUFFER,
 749 };
 750
 751 #endif /* console on line printer */
 752
 753 /* --- initialisation code ------------------------------------- */
 754
 755 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
 756 static char *parport[LP_NO] = { NULL,  };
 757 static int reset = 0;
 758
 759 module_param_array(parport, charp, NULL, 0);
 760 module_param(reset, bool, 0);
 761
 762 #ifndef MODULE
 763 static int __init lp_setup (char *str)
 764 {
 765         static int parport_ptr; // initially zero
 766         int x;
 767
 768         if (get_option (&str, &x)) {
 769                 if (x == 0) {
 770                         /* disable driver on "lp=" or "lp=0" */
 771                         parport_nr[0] = LP_PARPORT_OFF;
 772                 } else {
 773                         printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
 774                         return 0;
 775                 }
 776         } else if (!strncmp(str, "parport", 7)) {
 777                 int n = simple_strtoul(str+7, NULL, 10);
 778                 if (parport_ptr < LP_NO)
 779                         parport_nr[parport_ptr++] = n;
 780                 else
 781                         printk(KERN_INFO "lp: too many ports, %s ignored.\n",
 782                                str);
 783         } else if (!strcmp(str, "auto")) {
 784                 parport_nr[0] = LP_PARPORT_AUTO;
 785         } else if (!strcmp(str, "none")) {
 786                 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
 787         } else if (!strcmp(str, "reset")) {
 788                 reset = 1;
 789         }
 790         return 1;
 791 }
 792 #endif
 793
 794 static int lp_register(int nr, struct parport *port)
 795 {
 796         lp_table[nr].dev = parport_register_device(port, "lp",
 797                                                    lp_preempt, NULL, NULL, 0,
 798                                                    (void *) &lp_table[nr]);
 799         if (lp_table[nr].dev == NULL)
 800                 return 1;
 801         lp_table[nr].flags |= LP_EXIST;
 802
 803         if (reset)
 804                 lp_reset(nr);
 805
 806         class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL,
 807                                 "lp%d", nr);
 808
 809         printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
 810                (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
 811
 812 #ifdef CONFIG_LP_CONSOLE
 813         if (!nr) {
 814                 if (port->modes & PARPORT_MODE_SAFEININT) {
 815                         register_console (&lpcons);
 816                         console_registered = port;
 817                         printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
 818                 } else
 819                         printk (KERN_ERR "lp%d: cannot run console on %s\n",
 820                                 CONSOLE_LP, port->name);
 821         }
 822 #endif
 823
 824         return 0;
 825 }
 826
 827 static void lp_attach (struct parport *port)
 828 {
 829         unsigned int i;
 830
 831         switch (parport_nr[0])
 832         {
 833         case LP_PARPORT_UNSPEC:
 834         case LP_PARPORT_AUTO:
 835                 if (parport_nr[0] == LP_PARPORT_AUTO &&
 836                     port->probe_info[0].class != PARPORT_CLASS_PRINTER)
 837                         return;
 838                 if (lp_count == LP_NO) {
 839                         printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
 840                         return;
 841                 }
 842                 if (!lp_register(lp_count, port))
 843                         lp_count++;
 844                 break;
 845
 846         default:
 847                 for (i = 0; i < LP_NO; i++) {
 848                         if (port->number == parport_nr[i]) {
 849                                 if (!lp_register(i, port))
 850                                         lp_count++;
 851                                 break;
 852                         }
 853                 }
 854                 break;
 855         }
 856 }
 857
 858 static void lp_detach (struct parport *port)
 859 {
 860         /* Write this some day. */
 861 #ifdef CONFIG_LP_CONSOLE
 862         if (console_registered == port) {
 863                 unregister_console (&lpcons);
 864                 console_registered = NULL;
 865         }
 866 #endif /* CONFIG_LP_CONSOLE */
 867 }
 868
 869 static struct parport_driver lp_driver = {
 870         .name = "lp",
 871         .attach = lp_attach,
 872         .detach = lp_detach,
 873 };
 874
 875 static int __init lp_init (void)
 876 {
 877         int i, err = 0;
 878
 879         if (parport_nr[0] == LP_PARPORT_OFF)
 880                 return 0;
 881
 882         for (i = 0; i < LP_NO; i++) {
 883                 lp_table[i].dev = NULL;
 884                 lp_table[i].flags = 0;
 885                 lp_table[i].chars = LP_INIT_CHAR;
 886                 lp_table[i].time = LP_INIT_TIME;
 887                 lp_table[i].wait = LP_INIT_WAIT;
 888                 lp_table[i].lp_buffer = NULL;
 889 #ifdef LP_STATS
 890                 lp_table[i].lastcall = 0;
 891                 lp_table[i].runchars = 0;
 892                 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats));
 893 #endif
 894                 lp_table[i].last_error = 0;
 895                 init_waitqueue_head (&lp_table[i].waitq);
 896                 init_waitqueue_head (&lp_table[i].dataq);
 897                 init_MUTEX (&lp_table[i].port_mutex);
 898                 lp_table[i].timeout = 10 * HZ;
 899         }
 900
 901         if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
 902                 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
 903                 return -EIO;
 904         }
 905
 906         lp_class = class_create(THIS_MODULE, "printer");
 907         if (IS_ERR(lp_class)) {
 908                 err = PTR_ERR(lp_class);
 909                 goto out_reg;
 910         }
 911
 912         if (parport_register_driver (&lp_driver)) {
 913                 printk (KERN_ERR "lp: unable to register with parport\n");
 914                 err = -EIO;
 915                 goto out_class;
 916         }
 917
 918         if (!lp_count) {
 919                 printk (KERN_INFO "lp: driver loaded but no devices found\n");
 920 #ifndef CONFIG_PARPORT_1284
 921                 if (parport_nr[0] == LP_PARPORT_AUTO)
 922                         printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
 923 #endif
 924         }
 925
 926         return 0;
 927
 928 out_class:
 929         class_destroy(lp_class);
 930 out_reg:
 931         unregister_chrdev(LP_MAJOR, "lp");
 932         return err;
 933 }
 934
 935 static int __init lp_init_module (void)
 936 {
 937         if (parport[0]) {
 938                 /* The user gave some parameters.  Let's see what they were.  */
 939                 if (!strncmp(parport[0], "auto", 4))
 940                         parport_nr[0] = LP_PARPORT_AUTO;
 941                 else {
 942                         int n;
 943                         for (n = 0; n < LP_NO && parport[n]; n++) {
 944                                 if (!strncmp(parport[n], "none", 4))
 945                                         parport_nr[n] = LP_PARPORT_NONE;
 946                                 else {
 947                                         char *ep;
 948                                         unsigned long r = simple_strtoul(parport[n], &ep, 0);
 949                                         if (ep != parport[n])
 950                                                 parport_nr[n] = r;
 951                                         else {
 952                                                 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
 953                                                 return -ENODEV;
 954                                         }
 955                                 }
 956                         }
 957                 }
 958         }
 959
 960         return lp_init();
 961 }
 962
 963 static void lp_cleanup_module (void)
 964 {
 965         unsigned int offset;
 966
 967         parport_unregister_driver (&lp_driver);
 968
 969 #ifdef CONFIG_LP_CONSOLE
 970         unregister_console (&lpcons);
 971 #endif
 972
 973         unregister_chrdev(LP_MAJOR, "lp");
 974         for (offset = 0; offset < LP_NO; offset++) {
 975                 if (lp_table[offset].dev == NULL)
 976                         continue;
 977                 parport_unregister_device(lp_table[offset].dev);
 978                 class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
 979         }
 980         class_destroy(lp_class);
 981 }
 982
 983 __setup("lp=", lp_setup);
 984 module_init(lp_init_module);
 985 module_exit(lp_cleanup_module);
 986
 987 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
 988 MODULE_LICENSE("GPL");