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 <Philip.Blundell@pobox.com>
  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  * Interrupt handling workaround for printers with buggy handshake
  20  *                              by Andrea Arcangeli, 11 May 98
  21  */
  22
  23 /* This driver should, in theory, work with any parallel port that has an
  24  * appropriate low-level driver; all I/O is done through the parport
  25  * abstraction layer.
  26  *
  27  * If this driver is built into the kernel, you can configure it using the
  28  * kernel command-line.  For example:
  29  *
  30  *      lp=parport1,none,parport2       (bind lp0 to parport1, disable lp1 and
  31  *                                       bind lp2 to parport2)
  32  *
  33  *      lp=auto                         (assign lp devices to all ports that
  34  *                                       have printers attached, as determined
  35  *                                       by the IEEE-1284 autoprobe)
  36  *
  37  *      lp=reset                        (reset the printer during
  38  *                                       initialisation)
  39  *
  40  *      lp=off                          (disable the printer driver entirely)
  41  *
  42  * If the driver is loaded as a module, similar functionality is available
  43  * using module parameters.  The equivalent of the above commands would be:
  44  *
  45  *      # insmod lp.o parport=1,none,2
  46  *
  47  *      # insmod lp.o parport=auto
  48  *
  49  *      # insmod lp.o reset=1
  50  */
  51
  52 /* COMPATIBILITY WITH OLD KERNELS
  53  *
  54  * Under Linux 2.0 and previous versions, lp devices were bound to ports at
  55  * particular I/O addresses, as follows:
  56  *
  57  *      lp0             0x3bc
  58  *      lp1             0x378
  59  *      lp2             0x278
  60  *
  61  * The new driver, by default, binds lp devices to parport devices as it
  62  * finds them.  This means that if you only have one port, it will be bound
  63  * to lp0 regardless of its I/O address.  If you need the old behaviour, you
  64  * can force it using the parameters described above.
  65  */
  66
  67 /*
  68  * The new interrupt handling code take care of the buggy handshake
  69  * of some HP and Epson printer:
  70  * ___
  71  * ACK    _______________    ___________
  72  *                       |__|
  73  * ____
  74  * BUSY   _________              _______
  75  *                 |____________|
  76  *
  77  * I discovered this using the printer scanner that you can find at:
  78  *
  79  *      ftp://e-mind.com/pub/linux/pscan/
  80  *
  81  *                                      11 May 98, Andrea Arcangeli
  82  */
  83
  84 #include <linux/module.h>
  85 #include <linux/init.h>
  86
  87 #include <linux/config.h>
  88 #include <linux/errno.h>
  89 #include <linux/kernel.h>
  90 #include <linux/major.h>
  91 #include <linux/sched.h>
  92 #include <linux/malloc.h>
  93 #include <linux/fcntl.h>
  94 #include <linux/delay.h>
  95
  96 #include <linux/parport.h>
  97 #undef LP_STATS
  98 #undef LP_NEED_CAREFUL
  99 #include <linux/lp.h>
 100
 101 #include <asm/irq.h>
 102 #include <asm/uaccess.h>
 103 #include <asm/system.h>
 104
 105 /* if you have more than 3 printers, remember to increase LP_NO */
 106 #define LP_NO 3
 107
 108 struct lp_struct lp_table[LP_NO] =
 109 {
 110         [0 ... LP_NO-1] = {NULL, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT,
 111                            NULL,
 112 #ifdef LP_STATS
 113                            0, 0, {0},
 114 #endif
 115                            NULL, 0, 0, 0}
 116 };
 117
 118 /* Test if printer is ready (and optionally has no error conditions) */
 119 #ifdef LP_NEED_CAREFUL
 120 #define LP_READY(minor, status) \
 121   ((LP_F(minor) & LP_CAREFUL) ? _LP_CAREFUL_READY(status) : ((status) & LP_PBUSY))
 122 #define _LP_CAREFUL_READY(status) \
 123    ((status) & (LP_PBUSY|LP_POUTPA|LP_PSELECD|LP_PERRORP)) == \
 124       (LP_PBUSY|LP_PSELECD|LP_PERRORP)
 125 #else
 126 #define LP_READY(minor, status) ((status) & LP_PBUSY)
 127 #endif
 128
 129 #undef LP_DEBUG
 130 #undef LP_READ_DEBUG
 131
 132 /* --- parport support ----------------------------------------- */
 133
 134 static int lp_preempt(void *handle)
 135 {
 136        struct lp_struct *lps = (struct lp_struct *)handle;
 137
 138        if (waitqueue_active (&lps->wait_q))
 139                wake_up_interruptible(&lps->wait_q);
 140
 141        /* Don't actually release the port now */
 142        return 1;
 143 }
 144
 145 #define lp_parport_release(x)   do { parport_release(lp_table[(x)].dev); } while (0);
 146 #define lp_parport_claim(x)     do { parport_claim_or_block(lp_table[(x)].dev); } while (0);
 147
 148 /* --- low-level port access ----------------------------------- */
 149
 150 #define r_dtr(x)        (parport_read_data(lp_table[(x)].dev->port))
 151 #define r_str(x)        (parport_read_status(lp_table[(x)].dev->port))
 152 #define w_ctr(x,y)      do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
 153 #define w_dtr(x,y)      do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
 154
 155 static __inline__ void lp_yield (int minor)
 156 {
 157         if (!parport_yield_blocking (lp_table[minor].dev))
 158         {
 159                 if (current->need_resched)
 160                         schedule ();
 161         } else
 162                 lp_table[minor].irq_missed = 1;
 163 }
 164
 165 static __inline__ void lp_schedule(int minor, long timeout)
 166 {
 167         struct pardevice *dev = lp_table[minor].dev;
 168         register unsigned long int timeslip = (jiffies - dev->time);
 169         if ((timeslip > dev->timeslice) && (dev->port->waithead != NULL)) {
 170                 lp_parport_release(minor);
 171                 lp_table[minor].irq_missed = 1;
 172                 schedule_timeout(timeout);
 173                 lp_parport_claim(minor);
 174         } else
 175                 schedule_timeout(timeout);
 176 }
 177
 178 static int lp_reset(int minor)
 179 {
 180         int retval;
 181         lp_parport_claim (minor);
 182         w_ctr(minor, LP_PSELECP);
 183         udelay (LP_DELAY);
 184         w_ctr(minor, LP_PSELECP | LP_PINITP);
 185         retval = r_str(minor);
 186         lp_parport_release (minor);
 187         return retval;
 188 }
 189
 190 static inline int lp_char(char lpchar, int minor)
 191 {
 192         unsigned int wait = 0;
 193         unsigned long count = 0;
 194 #ifdef LP_STATS
 195         struct lp_stats *stats;
 196 #endif
 197
 198         for (;;)
 199         {
 200                 lp_yield(minor);
 201                 if (LP_READY(minor, r_str(minor)))
 202                         break;
 203                 if (++count == LP_CHAR(minor) || signal_pending(current))
 204                         return 0;
 205         }
 206
 207         w_dtr(minor, lpchar);
 208 #ifdef LP_STATS
 209         stats = &LP_STAT(minor);
 210         stats->chars++;
 211 #endif
 212         /* must wait before taking strobe high, and after taking strobe
 213            low, according spec.  Some printers need it, others don't. */
 214 #ifndef __sparc__
 215         while (wait != LP_WAIT(minor)) /* FIXME: should be a udelay() */
 216                 wait++;
 217 #else
 218         udelay(1);
 219 #endif
 220         /* control port takes strobe high */
 221         w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PSTROBE);
 222 #ifndef __sparc__
 223         while (wait)                    /* FIXME: should be a udelay() */
 224                 wait--;
 225 #else
 226         udelay(1);
 227 #endif
 228         /* take strobe low */
 229         if (LP_POLLED(minor))
 230                 /* take strobe low */
 231                 w_ctr(minor, LP_PSELECP | LP_PINITP);
 232         else
 233         {
 234                 lp_table[minor].irq_detected = 0;
 235                 lp_table[minor].irq_missed = 0;
 236                 w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PINTEN);
 237         }
 238
 239 #ifdef LP_STATS
 240         /* update waittime statistics */
 241         if (count > stats->maxwait) {
 242 #ifdef LP_DEBUG
 243                 printk(KERN_DEBUG "lp%d success after %d counts.\n", minor, count);
 244 #endif
 245                 stats->maxwait = count;
 246         }
 247         count *= 256;
 248         wait = (count > stats->meanwait) ? count - stats->meanwait :
 249             stats->meanwait - count;
 250         stats->meanwait = (255 * stats->meanwait + count + 128) / 256;
 251         stats->mdev = ((127 * stats->mdev) + wait + 64) / 128;
 252 #endif
 253
 254         return 1;
 255 }
 256
 257 static void lp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 258 {
 259         struct lp_struct *lp_dev = (struct lp_struct *) dev_id;
 260
 261         if (waitqueue_active (&lp_dev->wait_q))
 262                 wake_up_interruptible(&lp_dev->wait_q);
 263
 264         lp_dev->irq_detected = 1;
 265         lp_dev->irq_missed = 0;
 266 }
 267
 268 static void lp_error(int minor)
 269 {
 270         if (LP_POLLED(minor) || LP_PREEMPTED(minor)) {
 271                 current->state = TASK_INTERRUPTIBLE;
 272                 lp_parport_release(minor);
 273                 schedule_timeout(LP_TIMEOUT_POLLED);
 274                 lp_parport_claim(minor);
 275                 lp_table[minor].irq_missed = 1;
 276         }
 277 }
 278
 279 static int lp_check_status(int minor)
 280 {
 281         unsigned int last = lp_table[minor].last_error;
 282         unsigned char status = r_str(minor);
 283         if ((status & LP_POUTPA)) {
 284                 if (last != LP_POUTPA) {
 285                         last = LP_POUTPA;
 286                         printk(KERN_INFO "lp%d out of paper\n", minor);
 287                 }
 288         } else if (!(status & LP_PSELECD)) {
 289                 if (last != LP_PSELECD) {
 290                         last = LP_PSELECD;
 291                         printk(KERN_INFO "lp%d off-line\n", minor);
 292                 }
 293         } else if (!(status & LP_PERRORP)) {
 294                 if (last != LP_PERRORP) {
 295                         last = LP_PERRORP;
 296                         printk(KERN_ERR "lp%d on fire!\n", minor);
 297                 }
 298         }
 299         else last = 0;
 300
 301         lp_table[minor].last_error = last;
 302
 303         if (last != 0) {
 304                 if (LP_F(minor) & LP_ABORT)
 305                         return 1;
 306                 lp_error(minor);
 307         }
 308
 309         return 0;
 310 }
 311
 312 static int lp_write_buf(unsigned int minor, const char *buf, int count)
 313 {
 314         unsigned long copy_size;
 315         unsigned long total_bytes_written = 0;
 316         unsigned long bytes_written;
 317         struct lp_struct *lp = &lp_table[minor];
 318
 319         if (minor >= LP_NO)
 320                 return -ENXIO;
 321         if (lp->dev == NULL)
 322                 return -ENXIO;
 323
 324         lp_table[minor].last_error = 0;
 325         lp_table[minor].irq_detected = 0;
 326         lp_table[minor].irq_missed = 1;
 327
 328         w_ctr(minor, LP_PSELECP | LP_PINITP);
 329
 330         do {
 331                 bytes_written = 0;
 332                 copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
 333
 334                 if (copy_from_user(lp->lp_buffer, buf, copy_size))
 335                 {
 336                         w_ctr(minor, LP_PSELECP | LP_PINITP);
 337                         return -EFAULT;
 338                 }
 339
 340                 while (copy_size) {
 341                         if (lp_char(lp->lp_buffer[bytes_written], minor)) {
 342                                 --copy_size;
 343                                 ++bytes_written;
 344 #ifdef LP_STATS
 345                                 lp->runchars++;
 346 #endif
 347                         } else {
 348                                 int rc = total_bytes_written + bytes_written;
 349
 350 #ifdef LP_STATS
 351                                 if (lp->runchars > LP_STAT(minor).maxrun)
 352                                         LP_STAT(minor).maxrun = lp->runchars;
 353                                 LP_STAT(minor).sleeps++;
 354 #endif
 355
 356                                 if (signal_pending(current))
 357                                 {
 358                                         w_ctr(minor, LP_PSELECP | LP_PINITP);
 359                                         if (total_bytes_written + bytes_written)
 360                                                 return total_bytes_written + bytes_written;
 361                                         else
 362                                                 return -EINTR;
 363                                 }
 364
 365 #ifdef LP_STATS
 366                                 lp->runchars = 0;
 367 #endif
 368
 369                                 if (lp_check_status(minor))
 370                                 {
 371                                         w_ctr(minor, LP_PSELECP | LP_PINITP);
 372                                         return rc ? rc : -EIO;
 373                                 }
 374
 375                                 if (LP_POLLED(minor) ||
 376                                     lp_table[minor].irq_missed)
 377                                 {
 378                                 lp_polling:
 379 #if defined(LP_DEBUG) && defined(LP_STATS)
 380                                         printk(KERN_DEBUG "lp%d sleeping at %d characters for %d jiffies\n", minor, lp->runchars, LP_TIME(minor));
 381 #endif
 382                                         current->state = TASK_INTERRUPTIBLE;
 383                                         lp_schedule(minor, LP_TIME(minor));
 384                                 } else {
 385                                         cli();
 386                                         if (LP_PREEMPTED(minor))
 387                                         {
 388                                                 /*
 389                                                  * We can' t sleep on the interrupt
 390                                                  * since another pardevice need the port.
 391                                                  * We must check this in a cli() protected
 392                                                  * envinroment to avoid parport sharing
 393                                                  * starvation.
 394                                                  */
 395                                                 sti();
 396                                                 goto lp_polling;
 397                                         }
 398                                         if (!lp_table[minor].irq_detected)
 399                                         {
 400                                                 interruptible_sleep_on_timeout(&lp->wait_q, LP_TIMEOUT_INTERRUPT);
 401                                         }
 402                                         sti();
 403                                 }
 404                         }
 405                 }
 406
 407                 total_bytes_written += bytes_written;
 408                 buf += bytes_written;
 409                 count -= bytes_written;
 410
 411         } while (count > 0);
 412
 413         w_ctr(minor, LP_PSELECP | LP_PINITP);
 414         return total_bytes_written;
 415 }
 416
 417 static ssize_t lp_write(struct file * file, const char * buf,
 418                         size_t count, loff_t *ppos)
 419 {
 420         unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
 421         ssize_t retv;
 422
 423 #ifdef LP_STATS
 424         if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
 425                 lp_table[minor].runchars = 0;
 426
 427         lp_table[minor].lastcall = jiffies;
 428 #endif
 429
 430         /* Claim Parport or sleep until it becomes available
 431          */
 432         lp_parport_claim (minor);
 433
 434         retv = lp_write_buf(minor, buf, count);
 435
 436         lp_parport_release (minor);
 437         return retv;
 438 }
 439
 440 static long long lp_lseek(struct file * file, long long offset, int origin)
 441 {
 442         return -ESPIPE;
 443 }
 444
 445 #ifdef CONFIG_PRINTER_READBACK
 446
 447 static int lp_read_nibble(int minor)
 448 {
 449         unsigned char i;
 450         i = r_str(minor)>>3;
 451         i &= ~8;
 452         if ((i & 0x10) == 0) i |= 8;
 453         return (i & 0x0f);
 454 }
 455
 456 static inline void lp_select_in_high(int minor)
 457 {
 458         parport_frob_control(lp_table[minor].dev->port, 8, 8);
 459 }
 460
 461 /* Status readback confirming to ieee1284 */
 462 static ssize_t lp_read(struct file * file, char * buf,
 463                        size_t count, loff_t *ppos)
 464 {
 465         unsigned char z=0, Byte=0, status;
 466         char *temp;
 467         ssize_t retval;
 468         unsigned int counter=0;
 469         unsigned int i;
 470         unsigned int minor=MINOR(file->f_dentry->d_inode->i_rdev);
 471
 472         /* Claim Parport or sleep until it becomes available
 473          */
 474         lp_parport_claim (minor);
 475
 476         temp=buf;
 477 #ifdef LP_READ_DEBUG
 478         printk(KERN_INFO "lp%d: read mode\n", minor);
 479 #endif
 480
 481         retval = verify_area(VERIFY_WRITE, buf, count);
 482         if (retval)
 483                 return retval;
 484         if (parport_ieee1284_nibble_mode_ok(lp_table[minor].dev->port, 0)==0) {
 485 #ifdef LP_READ_DEBUG
 486                 printk(KERN_INFO "lp%d: rejected IEEE1284 negotiation.\n",
 487                        minor);
 488 #endif
 489                 lp_select_in_high(minor);
 490                 parport_release(lp_table[minor].dev);
 491                 return temp-buf;          /*  End of file */
 492         }
 493         for (i=0; i<=(count*2); i++) {
 494                 parport_frob_control(lp_table[minor].dev->port, 2, 2); /* AutoFeed high */
 495                 do {
 496                         status = (r_str(minor) & 0x40);
 497                         udelay(50);
 498                         counter++;
 499                         if (current->need_resched)
 500                                 schedule ();
 501                 } while ((status == 0x40) && (counter < 20));
 502                 if (counter == 20) {
 503                         /* Timeout */
 504 #ifdef LP_READ_DEBUG
 505                         printk(KERN_DEBUG "lp_read: (Autofeed high) timeout\n");
 506 #endif
 507                         parport_frob_control(lp_table[minor].dev->port, 2, 0);
 508                         lp_select_in_high(minor);
 509                         parport_release(lp_table[minor].dev);
 510                         return temp-buf; /* end the read at timeout */
 511                 }
 512                 counter=0;
 513                 z = lp_read_nibble(minor);
 514                 parport_frob_control(lp_table[minor].dev->port, 2, 0); /* AutoFeed low */
 515                 do {
 516                         status=(r_str(minor) & 0x40);
 517                         udelay(20);
 518                         counter++;
 519                         if (current->need_resched)
 520                                 schedule ();
 521                 } while ( (status == 0) && (counter < 20) );
 522                 if (counter == 20) { /* Timeout */
 523 #ifdef LP_READ_DEBUG
 524                         printk(KERN_DEBUG "lp_read: (Autofeed low) timeout\n");
 525 #endif
 526                         if (signal_pending(current)) {
 527                                 lp_select_in_high(minor);
 528                                 parport_release(lp_table[minor].dev);
 529                                 if (temp !=buf)
 530                                         return temp-buf;
 531                                 else
 532                                         return -EINTR;
 533                         }
 534                         current->state=TASK_INTERRUPTIBLE;
 535                         schedule_timeout(LP_TIME(minor));
 536                 }
 537
 538                 counter=0;
 539
 540                 if (( i & 1) != 0) {
 541                         Byte= (Byte | z<<4);
 542                         if (__put_user(Byte, (char *)temp))
 543                                 return -EFAULT;
 544                         temp++;
 545                 } else Byte=z;
 546         }
 547
 548         lp_select_in_high(minor);
 549         lp_parport_release(minor);
 550         return temp-buf;
 551 }
 552
 553 #endif
 554
 555 static int lp_open(struct inode * inode, struct file * file)
 556 {
 557         unsigned int minor = MINOR(inode->i_rdev);
 558
 559         if (minor >= LP_NO)
 560                 return -ENXIO;
 561         if ((LP_F(minor) & LP_EXIST) == 0)
 562                 return -ENXIO;
 563         if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor)))
 564                 return -EBUSY;
 565
 566         MOD_INC_USE_COUNT;
 567
 568         /* If ABORTOPEN is set and the printer is offline or out of paper,
 569            we may still want to open it to perform ioctl()s.  Therefore we
 570            have commandeered O_NONBLOCK, even though it is being used in
 571            a non-standard manner.  This is strictly a Linux hack, and
 572            should most likely only ever be used by the tunelp application. */
 573         if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
 574                 int status;
 575                 lp_parport_claim (minor);
 576                 status = r_str(minor);
 577                 lp_parport_release (minor);
 578                 if (status & LP_POUTPA) {
 579                         printk(KERN_INFO "lp%d out of paper\n", minor);
 580                         MOD_DEC_USE_COUNT;
 581                         LP_F(minor) &= ~LP_BUSY;
 582                         return -ENOSPC;
 583                 } else if (!(status & LP_PSELECD)) {
 584                         printk(KERN_INFO "lp%d off-line\n", minor);
 585                         MOD_DEC_USE_COUNT;
 586                         LP_F(minor) &= ~LP_BUSY;
 587                         return -EIO;
 588                 } else if (!(status & LP_PERRORP)) {
 589                         printk(KERN_ERR "lp%d printer error\n", minor);
 590                         MOD_DEC_USE_COUNT;
 591                         LP_F(minor) &= ~LP_BUSY;
 592                         return -EIO;
 593                 }
 594         }
 595         lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
 596         if (!lp_table[minor].lp_buffer) {
 597                 MOD_DEC_USE_COUNT;
 598                 LP_F(minor) &= ~LP_BUSY;
 599                 return -ENOMEM;
 600         }
 601         return 0;
 602 }
 603
 604 static int lp_release(struct inode * inode, struct file * file)
 605 {
 606         unsigned int minor = MINOR(inode->i_rdev);
 607
 608         kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
 609         lp_table[minor].lp_buffer = NULL;
 610         MOD_DEC_USE_COUNT;
 611         LP_F(minor) &= ~LP_BUSY;
 612         return 0;
 613 }
 614
 615 static int lp_ioctl(struct inode *inode, struct file *file,
 616                     unsigned int cmd, unsigned long arg)
 617 {
 618         unsigned int minor = MINOR(inode->i_rdev);
 619         int status;
 620         int retval = 0;
 621
 622 #ifdef LP_DEBUG
 623         printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);
 624 #endif
 625         if (minor >= LP_NO)
 626                 return -ENODEV;
 627         if ((LP_F(minor) & LP_EXIST) == 0)
 628                 return -ENODEV;
 629         switch ( cmd ) {
 630                 case LPTIME:
 631                         LP_TIME(minor) = arg * HZ/100;
 632                         break;
 633                 case LPCHAR:
 634                         LP_CHAR(minor) = arg;
 635                         break;
 636                 case LPABORT:
 637                         if (arg)
 638                                 LP_F(minor) |= LP_ABORT;
 639                         else
 640                                 LP_F(minor) &= ~LP_ABORT;
 641                         break;
 642                 case LPABORTOPEN:
 643                         if (arg)
 644                                 LP_F(minor) |= LP_ABORTOPEN;
 645                         else
 646                                 LP_F(minor) &= ~LP_ABORTOPEN;
 647                         break;
 648 #ifdef LP_NEED_CAREFUL
 649                 case LPCAREFUL:
 650                         if (arg)
 651                                 LP_F(minor) |= LP_CAREFUL;
 652                         else
 653                                 LP_F(minor) &= ~LP_CAREFUL;
 654                         break;
 655 #endif
 656                 case LPWAIT:
 657                         LP_WAIT(minor) = arg;
 658                         break;
 659                 case LPSETIRQ:
 660                         return -EINVAL;
 661                         break;
 662                 case LPGETIRQ:
 663                         if (copy_to_user((int *) arg, &LP_IRQ(minor),
 664                                         sizeof(int)))
 665                                 return -EFAULT;
 666                         break;
 667                 case LPGETSTATUS:
 668                         lp_parport_claim(minor);
 669                         status = r_str(minor);
 670                         lp_parport_release(minor);
 671
 672                         if (copy_to_user((int *) arg, &status, sizeof(int)))
 673                                 return -EFAULT;
 674                         break;
 675                 case LPRESET:
 676                         lp_reset(minor);
 677                         break;
 678 #ifdef LP_STATS
 679                 case LPGETSTATS:
 680                         if (copy_to_user((int *) arg, &LP_STAT(minor),
 681                                         sizeof(struct lp_stats)))
 682                                 return -EFAULT;
 683                         if (suser())
 684                                 memset(&LP_STAT(minor), 0,
 685                                                 sizeof(struct lp_stats));
 686                         break;
 687 #endif
 688                 case LPGETFLAGS:
 689                         status = LP_F(minor);
 690                         if (copy_to_user((int *) arg, &status, sizeof(int)))
 691                                 return -EFAULT;
 692                         break;
 693                 default:
 694                         retval = -EINVAL;
 695         }
 696         return retval;
 697 }
 698
 699
 700 static struct file_operations lp_fops = {
 701         lp_lseek,
 702 #ifdef CONFIG_PRINTER_READBACK
 703         lp_read,
 704 #else
 705         NULL,
 706 #endif
 707         lp_write,
 708         NULL,           /* lp_readdir */
 709         NULL,           /* lp_poll */
 710         lp_ioctl,
 711         NULL,           /* lp_mmap */
 712         lp_open,
 713         NULL,           /* flush */
 714         lp_release
 715 };
 716
 717 /* --- initialisation code ------------------------------------- */
 718
 719 #ifdef MODULE
 720
 721 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
 722 static char *parport[LP_NO] = { NULL,  };
 723 static int reset = 0;
 724
 725 MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
 726 MODULE_PARM(reset, "i");
 727
 728 #else
 729
 730 static int parport_nr[LP_NO] __initdata = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
 731 static int reset __initdata = 0;
 732
 733 static int parport_ptr = 0;
 734
 735 __initfunc(void lp_setup(char *str, int *ints))
 736 {
 737         if (!str) {
 738                 if (ints[0] == 0 || ints[1] == 0) {
 739                         /* disable driver on "lp=" or "lp=0" */
 740                         parport_nr[0] = LP_PARPORT_OFF;
 741                 } else {
 742                         printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", ints[1]);
 743                 }
 744         } else if (!strncmp(str, "parport", 7)) {
 745                 int n = simple_strtoul(str+7, NULL, 10);
 746                 if (parport_ptr < LP_NO)
 747                         parport_nr[parport_ptr++] = n;
 748                 else
 749                         printk(KERN_INFO "lp: too many ports, %s ignored.\n",
 750                                str);
 751         } else if (!strcmp(str, "auto")) {
 752                 parport_nr[0] = LP_PARPORT_AUTO;
 753         } else if (!strcmp(str, "none")) {
 754                 parport_nr[parport_ptr++] = LP_PARPORT_NONE;
 755         } else if (!strcmp(str, "reset")) {
 756                 reset = 1;
 757         }
 758 }
 759
 760 #endif
 761
 762 int lp_register(int nr, struct parport *port)
 763 {
 764         lp_table[nr].dev = parport_register_device(port, "lp",
 765                                                    lp_preempt, NULL,
 766                                                    lp_interrupt,
 767                                                    0,
 768                                                    (void *) &lp_table[nr]);
 769         if (lp_table[nr].dev == NULL)
 770                 return 1;
 771         lp_table[nr].flags |= LP_EXIST;
 772
 773         if (reset)
 774                 lp_reset(nr);
 775
 776         printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
 777                (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
 778
 779         return 0;
 780 }
 781
 782 int lp_init(void)
 783 {
 784         unsigned int count = 0;
 785         unsigned int i;
 786         struct parport *port;
 787
 788         switch (parport_nr[0])
 789         {
 790         case LP_PARPORT_OFF:
 791                 return 0;
 792
 793         case LP_PARPORT_UNSPEC:
 794         case LP_PARPORT_AUTO:
 795                 for (port = parport_enumerate(); port; port = port->next) {
 796
 797                         if (parport_nr[0] == LP_PARPORT_AUTO &&
 798                             port->probe_info.class != PARPORT_CLASS_PRINTER)
 799                                 continue;
 800
 801                         if (!lp_register(count, port))
 802                                 if (++count == LP_NO)
 803                                         break;
 804                 }
 805                 break;
 806
 807         default:
 808                 for (i = 0; i < LP_NO; i++) {
 809                         if (parport_nr[i] >= 0) {
 810                                 char buffer[16];
 811                                 sprintf(buffer, "parport%d", parport_nr[i]);
 812                                 for (port = parport_enumerate(); port;
 813                                      port = port->next) {
 814                                         if (!strcmp(port->name, buffer)) {
 815                                                 (void) lp_register(i, port);
 816                                                 count++;
 817                                                 break;
 818                                         }
 819                                 }
 820                         }
 821                 }
 822                 break;
 823         }
 824
 825         if (count) {
 826                 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
 827                         printk("lp: unable to get major %d\n", LP_MAJOR);
 828                         return -EIO;
 829                 }
 830         } else {
 831                 printk(KERN_INFO "lp: driver loaded but no devices found\n");
 832         }
 833
 834         return 0;
 835 }
 836
 837 #ifdef MODULE
 838 int init_module(void)
 839 {
 840         if (parport[0]) {
 841                 /* The user gave some parameters.  Let's see what they were.  */
 842                 if (!strncmp(parport[0], "auto", 4))
 843                         parport_nr[0] = LP_PARPORT_AUTO;
 844                 else {
 845                         int n;
 846                         for (n = 0; n < LP_NO && parport[n]; n++) {
 847                                 if (!strncmp(parport[n], "none", 4))
 848                                         parport_nr[n] = LP_PARPORT_NONE;
 849                                 else {
 850                                         char *ep;
 851                                         unsigned long r = simple_strtoul(parport[n], &ep, 0);
 852                                         if (ep != parport[n])
 853                                                 parport_nr[n] = r;
 854                                         else {
 855                                                 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
 856                                                 return -ENODEV;
 857                                         }
 858                                 }
 859                         }
 860                 }
 861         }
 862
 863         return lp_init();
 864 }
 865
 866 void cleanup_module(void)
 867 {
 868         unsigned int offset;
 869
 870         unregister_chrdev(LP_MAJOR, "lp");
 871         for (offset = 0; offset < LP_NO; offset++) {
 872                 if (lp_table[offset].dev == NULL)
 873                         continue;
 874                 parport_unregister_device(lp_table[offset].dev);
 875         }
 876 }
 877 #endif