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/slab.h> 122#include <linux/fcntl.h> 123#include <linux/delay.h> 124#include <linux/poll.h> 125#include <linux/console.h> 126#include <linux/device.h> 127#include <linux/wait.h> 128#include <linux/jiffies.h> 129#include <linux/smp_lock.h> 130#include <linux/compat.h> 131 132#include <linux/parport.h> 133#undef LP_STATS 134#include <linux/lp.h> 135 136#include <asm/irq.h> 137#include <asm/uaccess.h> 138#include <asm/system.h> 139 140/* if you have more than 8 printers, remember to increase LP_NO */ 141#define LP_NO 8 142 143static struct lp_struct lp_table[LP_NO]; 144 145static unsigned int lp_count = 0; 146static struct class *lp_class; 147 148#ifdef CONFIG_LP_CONSOLE 149static struct parport *console_registered; 150#endif /* CONFIG_LP_CONSOLE */ 151 152#undef LP_DEBUG 153 154/* Bits used to manage claiming the parport device */ 155#define LP_PREEMPT_REQUEST 1 156#define LP_PARPORT_CLAIMED 2 157 158/* --- low-level port access ----------------------------------- */ 159 160#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 161#define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 162#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 163#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 164 165/* Claim the parport or block trying unless we've already claimed it */ 166static void lp_claim_parport_or_block(struct lp_struct *this_lp) 167{ 168 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 169 parport_claim_or_block (this_lp->dev); 170 } 171} 172 173/* Claim the parport or block trying unless we've already claimed it */ 174static void lp_release_parport(struct lp_struct *this_lp) 175{ 176 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 177 parport_release (this_lp->dev); 178 } 179} 180 181 182 183static int lp_preempt(void *handle) 184{ 185 struct lp_struct *this_lp = (struct lp_struct *)handle; 186 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 187 return (1); 188} 189 190 191/* 192 * Try to negotiate to a new mode; if unsuccessful negotiate to 193 * compatibility mode. Return the mode we ended up in. 194 */ 195static int lp_negotiate(struct parport * port, int mode) 196{ 197 if (parport_negotiate (port, mode) != 0) { 198 mode = IEEE1284_MODE_COMPAT; 199 parport_negotiate (port, mode); 200 } 201 202 return (mode); 203} 204 205static int lp_reset(int minor) 206{ 207 int retval; 208 lp_claim_parport_or_block (&lp_table[minor]); 209 w_ctr(minor, LP_PSELECP); 210 udelay (LP_DELAY); 211 w_ctr(minor, LP_PSELECP | LP_PINITP); 212 retval = r_str(minor); 213 lp_release_parport (&lp_table[minor]); 214 return retval; 215} 216 217static void lp_error (int minor) 218{ 219 DEFINE_WAIT(wait); 220 int polling; 221 222 if (LP_F(minor) & LP_ABORT) 223 return; 224 225 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; 226 if (polling) lp_release_parport (&lp_table[minor]); 227 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 228 schedule_timeout(LP_TIMEOUT_POLLED); 229 finish_wait(&lp_table[minor].waitq, &wait); 230 if (polling) lp_claim_parport_or_block (&lp_table[minor]); 231 else parport_yield_blocking (lp_table[minor].dev); 232} 233 234static int lp_check_status(int minor) 235{ 236 int error = 0; 237 unsigned int last = lp_table[minor].last_error; 238 unsigned char status = r_str(minor); 239 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 240 /* No error. */ 241 last = 0; 242 else if ((status & LP_POUTPA)) { 243 if (last != LP_POUTPA) { 244 last = LP_POUTPA; 245 printk(KERN_INFO "lp%d out of paper\n", minor); 246 } 247 error = -ENOSPC; 248 } else if (!(status & LP_PSELECD)) { 249 if (last != LP_PSELECD) { 250 last = LP_PSELECD; 251 printk(KERN_INFO "lp%d off-line\n", minor); 252 } 253 error = -EIO; 254 } else if (!(status & LP_PERRORP)) { 255 if (last != LP_PERRORP) { 256 last = LP_PERRORP; 257 printk(KERN_INFO "lp%d on fire\n", minor); 258 } 259 error = -EIO; 260 } else { 261 last = 0; /* Come here if LP_CAREFUL is set and no 262 errors are reported. */ 263 } 264 265 lp_table[minor].last_error = last; 266 267 if (last != 0) 268 lp_error(minor); 269 270 return error; 271} 272 273static int lp_wait_ready(int minor, int nonblock) 274{ 275 int error = 0; 276 277 /* If we're not in compatibility mode, we're ready now! */ 278 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 279 return (0); 280 } 281 282 do { 283 error = lp_check_status (minor); 284 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 285 break; 286 if (signal_pending (current)) { 287 error = -EINTR; 288 break; 289 } 290 } while (error); 291 return error; 292} 293 294static ssize_t lp_write(struct file * file, const char __user * buf, 295 size_t count, loff_t *ppos) 296{ 297 unsigned int minor = iminor(file->f_path.dentry->d_inode); 298 struct parport *port = lp_table[minor].dev->port; 299 char *kbuf = lp_table[minor].lp_buffer; 300 ssize_t retv = 0; 301 ssize_t written; 302 size_t copy_size = count; 303 int nonblock = ((file->f_flags & O_NONBLOCK) || 304 (LP_F(minor) & LP_ABORT)); 305 306#ifdef LP_STATS 307 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 308 lp_table[minor].runchars = 0; 309 310 lp_table[minor].lastcall = jiffies; 311#endif 312 313 /* Need to copy the data from user-space. */ 314 if (copy_size > LP_BUFFER_SIZE) 315 copy_size = LP_BUFFER_SIZE; 316 317 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 318 return -EINTR; 319 320 if (copy_from_user (kbuf, buf, copy_size)) { 321 retv = -EFAULT; 322 goto out_unlock; 323 } 324 325 /* Claim Parport or sleep until it becomes available 326 */ 327 lp_claim_parport_or_block (&lp_table[minor]); 328 /* Go to the proper mode. */ 329 lp_table[minor].current_mode = lp_negotiate (port, 330 lp_table[minor].best_mode); 331 332 parport_set_timeout (lp_table[minor].dev, 333 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 334 : lp_table[minor].timeout)); 335 336 if ((retv = lp_wait_ready (minor, nonblock)) == 0) 337 do { 338 /* Write the data. */ 339 written = parport_write (port, kbuf, copy_size); 340 if (written > 0) { 341 copy_size -= written; 342 count -= written; 343 buf += written; 344 retv += written; 345 } 346 347 if (signal_pending (current)) { 348 if (retv == 0) 349 retv = -EINTR; 350 351 break; 352 } 353 354 if (copy_size > 0) { 355 /* incomplete write -> check error ! */ 356 int error; 357 358 parport_negotiate (lp_table[minor].dev->port, 359 IEEE1284_MODE_COMPAT); 360 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 361 362 error = lp_wait_ready (minor, nonblock); 363 364 if (error) { 365 if (retv == 0) 366 retv = error; 367 break; 368 } else if (nonblock) { 369 if (retv == 0) 370 retv = -EAGAIN; 371 break; 372 } 373 374 parport_yield_blocking (lp_table[minor].dev); 375 lp_table[minor].current_mode 376 = lp_negotiate (port, 377 lp_table[minor].best_mode); 378 379 } else if (need_resched()) 380 schedule (); 381 382 if (count) { 383 copy_size = count; 384 if (copy_size > LP_BUFFER_SIZE) 385 copy_size = LP_BUFFER_SIZE; 386 387 if (copy_from_user(kbuf, buf, copy_size)) { 388 if (retv == 0) 389 retv = -EFAULT; 390 break; 391 } 392 } 393 } while (count > 0); 394 395 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 396 &lp_table[minor].bits)) { 397 printk(KERN_INFO "lp%d releasing parport\n", minor); 398 parport_negotiate (lp_table[minor].dev->port, 399 IEEE1284_MODE_COMPAT); 400 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 401 lp_release_parport (&lp_table[minor]); 402 } 403out_unlock: 404 mutex_unlock(&lp_table[minor].port_mutex); 405 406 return retv; 407} 408 409#ifdef CONFIG_PARPORT_1284 410 411/* Status readback conforming to ieee1284 */ 412static ssize_t lp_read(struct file * file, char __user * buf, 413 size_t count, loff_t *ppos) 414{ 415 DEFINE_WAIT(wait); 416 unsigned int minor=iminor(file->f_path.dentry->d_inode); 417 struct parport *port = lp_table[minor].dev->port; 418 ssize_t retval = 0; 419 char *kbuf = lp_table[minor].lp_buffer; 420 int nonblock = ((file->f_flags & O_NONBLOCK) || 421 (LP_F(minor) & LP_ABORT)); 422 423 if (count > LP_BUFFER_SIZE) 424 count = LP_BUFFER_SIZE; 425 426 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 427 return -EINTR; 428 429 lp_claim_parport_or_block (&lp_table[minor]); 430 431 parport_set_timeout (lp_table[minor].dev, 432 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 433 : lp_table[minor].timeout)); 434 435 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 436 if (parport_negotiate (lp_table[minor].dev->port, 437 IEEE1284_MODE_NIBBLE)) { 438 retval = -EIO; 439 goto out; 440 } 441 442 while (retval == 0) { 443 retval = parport_read (port, kbuf, count); 444 445 if (retval > 0) 446 break; 447 448 if (nonblock) { 449 retval = -EAGAIN; 450 break; 451 } 452 453 /* Wait for data. */ 454 455 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 456 parport_negotiate (lp_table[minor].dev->port, 457 IEEE1284_MODE_COMPAT); 458 lp_error (minor); 459 if (parport_negotiate (lp_table[minor].dev->port, 460 IEEE1284_MODE_NIBBLE)) { 461 retval = -EIO; 462 goto out; 463 } 464 } else { 465 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 466 schedule_timeout(LP_TIMEOUT_POLLED); 467 finish_wait(&lp_table[minor].waitq, &wait); 468 } 469 470 if (signal_pending (current)) { 471 retval = -ERESTARTSYS; 472 break; 473 } 474 475 cond_resched (); 476 } 477 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 478 out: 479 lp_release_parport (&lp_table[minor]); 480 481 if (retval > 0 && copy_to_user (buf, kbuf, retval)) 482 retval = -EFAULT; 483 484 mutex_unlock(&lp_table[minor].port_mutex); 485 486 return retval; 487} 488 489#endif /* IEEE 1284 support */ 490 491static int lp_open(struct inode * inode, struct file * file) 492{ 493 unsigned int minor = iminor(inode); 494 int ret = 0; 495 496 lock_kernel(); 497 if (minor >= LP_NO) { 498 ret = -ENXIO; 499 goto out; 500 } 501 if ((LP_F(minor) & LP_EXIST) == 0) { 502 ret = -ENXIO; 503 goto out; 504 } 505 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) { 506 ret = -EBUSY; 507 goto out; 508 } 509 /* If ABORTOPEN is set and the printer is offline or out of paper, 510 we may still want to open it to perform ioctl()s. Therefore we 511 have commandeered O_NONBLOCK, even though it is being used in 512 a non-standard manner. This is strictly a Linux hack, and 513 should most likely only ever be used by the tunelp application. */ 514 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 515 int status; 516 lp_claim_parport_or_block (&lp_table[minor]); 517 status = r_str(minor); 518 lp_release_parport (&lp_table[minor]); 519 if (status & LP_POUTPA) { 520 printk(KERN_INFO "lp%d out of paper\n", minor); 521 LP_F(minor) &= ~LP_BUSY; 522 ret = -ENOSPC; 523 goto out; 524 } else if (!(status & LP_PSELECD)) { 525 printk(KERN_INFO "lp%d off-line\n", minor); 526 LP_F(minor) &= ~LP_BUSY; 527 ret = -EIO; 528 goto out; 529 } else if (!(status & LP_PERRORP)) { 530 printk(KERN_ERR "lp%d printer error\n", minor); 531 LP_F(minor) &= ~LP_BUSY; 532 ret = -EIO; 533 goto out; 534 } 535 } 536 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 537 if (!lp_table[minor].lp_buffer) { 538 LP_F(minor) &= ~LP_BUSY; 539 ret = -ENOMEM; 540 goto out; 541 } 542 /* Determine if the peripheral supports ECP mode */ 543 lp_claim_parport_or_block (&lp_table[minor]); 544 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 545 !parport_negotiate (lp_table[minor].dev->port, 546 IEEE1284_MODE_ECP)) { 547 printk (KERN_INFO "lp%d: ECP mode\n", minor); 548 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 549 } else { 550 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 551 } 552 /* Leave peripheral in compatibility mode */ 553 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 554 lp_release_parport (&lp_table[minor]); 555 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 556out: 557 unlock_kernel(); 558 return ret; 559} 560 561static int lp_release(struct inode * inode, struct file * file) 562{ 563 unsigned int minor = iminor(inode); 564 565 lp_claim_parport_or_block (&lp_table[minor]); 566 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 567 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 568 lp_release_parport (&lp_table[minor]); 569 kfree(lp_table[minor].lp_buffer); 570 lp_table[minor].lp_buffer = NULL; 571 LP_F(minor) &= ~LP_BUSY; 572 return 0; 573} 574 575static int lp_do_ioctl(unsigned int minor, unsigned int cmd, 576 unsigned long arg, void __user *argp) 577{ 578 int status; 579 int retval = 0; 580 581#ifdef LP_DEBUG 582 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 583#endif 584 if (minor >= LP_NO) 585 return -ENODEV; 586 if ((LP_F(minor) & LP_EXIST) == 0) 587 return -ENODEV; 588 switch ( cmd ) { 589 case LPTIME: 590 LP_TIME(minor) = arg * HZ/100; 591 break; 592 case LPCHAR: 593 LP_CHAR(minor) = arg; 594 break; 595 case LPABORT: 596 if (arg) 597 LP_F(minor) |= LP_ABORT; 598 else 599 LP_F(minor) &= ~LP_ABORT; 600 break; 601 case LPABORTOPEN: 602 if (arg) 603 LP_F(minor) |= LP_ABORTOPEN; 604 else 605 LP_F(minor) &= ~LP_ABORTOPEN; 606 break; 607 case LPCAREFUL: 608 if (arg) 609 LP_F(minor) |= LP_CAREFUL; 610 else 611 LP_F(minor) &= ~LP_CAREFUL; 612 break; 613 case LPWAIT: 614 LP_WAIT(minor) = arg; 615 break; 616 case LPSETIRQ: 617 return -EINVAL; 618 break; 619 case LPGETIRQ: 620 if (copy_to_user(argp, &LP_IRQ(minor), 621 sizeof(int))) 622 return -EFAULT; 623 break; 624 case LPGETSTATUS: 625 lp_claim_parport_or_block (&lp_table[minor]); 626 status = r_str(minor); 627 lp_release_parport (&lp_table[minor]); 628 629 if (copy_to_user(argp, &status, sizeof(int))) 630 return -EFAULT; 631 break; 632 case LPRESET: 633 lp_reset(minor); 634 break; 635#ifdef LP_STATS 636 case LPGETSTATS: 637 if (copy_to_user(argp, &LP_STAT(minor), 638 sizeof(struct lp_stats))) 639 return -EFAULT; 640 if (capable(CAP_SYS_ADMIN)) 641 memset(&LP_STAT(minor), 0, 642 sizeof(struct lp_stats)); 643 break; 644#endif 645 case LPGETFLAGS: 646 status = LP_F(minor); 647 if (copy_to_user(argp, &status, sizeof(int))) 648 return -EFAULT; 649 break; 650 651 default: 652 retval = -EINVAL; 653 } 654 return retval; 655} 656 657static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout) 658{ 659 long to_jiffies; 660 661 /* Convert to jiffies, place in lp_table */ 662 if ((par_timeout->tv_sec < 0) || 663 (par_timeout->tv_usec < 0)) { 664 return -EINVAL; 665 } 666 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ); 667 to_jiffies += par_timeout->tv_sec * (long) HZ; 668 if (to_jiffies <= 0) { 669 return -EINVAL; 670 } 671 lp_table[minor].timeout = to_jiffies; 672 return 0; 673} 674 675static long lp_ioctl(struct file *file, unsigned int cmd, 676 unsigned long arg) 677{ 678 unsigned int minor; 679 struct timeval par_timeout; 680 int ret; 681 682 minor = iminor(file->f_path.dentry->d_inode); 683 lock_kernel(); 684 switch (cmd) { 685 case LPSETTIMEOUT: 686 if (copy_from_user(&par_timeout, (void __user *)arg, 687 sizeof (struct timeval))) { 688 ret = -EFAULT; 689 break; 690 } 691 ret = lp_set_timeout(minor, &par_timeout); 692 break; 693 default: 694 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 695 break; 696 } 697 unlock_kernel(); 698 699 return ret; 700} 701 702#ifdef CONFIG_COMPAT 703static long lp_compat_ioctl(struct file *file, unsigned int cmd, 704 unsigned long arg) 705{ 706 unsigned int minor; 707 struct timeval par_timeout; 708 struct compat_timeval __user *tc; 709 int ret; 710 711 minor = iminor(file->f_path.dentry->d_inode); 712 lock_kernel(); 713 switch (cmd) { 714 case LPSETTIMEOUT: 715 tc = compat_ptr(arg); 716 if (get_user(par_timeout.tv_sec, &tc->tv_sec) || 717 get_user(par_timeout.tv_usec, &tc->tv_usec)) { 718 ret = -EFAULT; 719 break; 720 } 721 ret = lp_set_timeout(minor, &par_timeout); 722 break; 723#ifdef LP_STATS 724 case LPGETSTATS: 725 ret = -EINVAL; 726 break; 727#endif 728 default: 729 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 730 break; 731 } 732 unlock_kernel(); 733 734 return ret; 735} 736#endif 737 738static const struct file_operations lp_fops = { 739 .owner = THIS_MODULE, 740 .write = lp_write, 741 .unlocked_ioctl = lp_ioctl, 742#ifdef CONFIG_COMPAT 743 .compat_ioctl = lp_compat_ioctl, 744#endif 745 .open = lp_open, 746 .release = lp_release, 747#ifdef CONFIG_PARPORT_1284 748 .read = lp_read, 749#endif 750}; 751 752/* --- support for console on the line printer ----------------- */ 753 754#ifdef CONFIG_LP_CONSOLE 755 756#define CONSOLE_LP 0 757 758/* If the printer is out of paper, we can either lose the messages or 759 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 760 * non-zero to get the latter behaviour. */ 761#define CONSOLE_LP_STRICT 1 762 763/* The console must be locked when we get here. */ 764 765static void lp_console_write (struct console *co, const char *s, 766 unsigned count) 767{ 768 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 769 struct parport *port = dev->port; 770 ssize_t written; 771 772 if (parport_claim (dev)) 773 /* Nothing we can do. */ 774 return; 775 776 parport_set_timeout (dev, 0); 777 778 /* Go to compatibility mode. */ 779 parport_negotiate (port, IEEE1284_MODE_COMPAT); 780 781 do { 782 /* Write the data, converting LF->CRLF as we go. */ 783 ssize_t canwrite = count; 784 char *lf = memchr (s, '\n', count); 785 if (lf) 786 canwrite = lf - s; 787 788 if (canwrite > 0) { 789 written = parport_write (port, s, canwrite); 790 791 if (written <= 0) 792 continue; 793 794 s += written; 795 count -= written; 796 canwrite -= written; 797 } 798 799 if (lf && canwrite <= 0) { 800 const char *crlf = "\r\n"; 801 int i = 2; 802 803 /* Dodge the original '\n', and put '\r\n' instead. */ 804 s++; 805 count--; 806 do { 807 written = parport_write (port, crlf, i); 808 if (written > 0) 809 i -= written, crlf += written; 810 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 811 } 812 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 813 814 parport_release (dev); 815} 816 817static struct console lpcons = { 818 .name = "lp", 819 .write = lp_console_write, 820 .flags = CON_PRINTBUFFER, 821}; 822 823#endif /* console on line printer */ 824 825/* --- initialisation code ------------------------------------- */ 826 827static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 828static char *parport[LP_NO]; 829static int reset; 830 831module_param_array(parport, charp, NULL, 0); 832module_param(reset, bool, 0); 833 834#ifndef MODULE 835static int __init lp_setup (char *str) 836{ 837 static int parport_ptr; 838 int x; 839 840 if (get_option(&str, &x)) { 841 if (x == 0) { 842 /* disable driver on "lp=" or "lp=0" */ 843 parport_nr[0] = LP_PARPORT_OFF; 844 } else { 845 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 846 return 0; 847 } 848 } else if (!strncmp(str, "parport", 7)) { 849 int n = simple_strtoul(str+7, NULL, 10); 850 if (parport_ptr < LP_NO) 851 parport_nr[parport_ptr++] = n; 852 else 853 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 854 str); 855 } else if (!strcmp(str, "auto")) { 856 parport_nr[0] = LP_PARPORT_AUTO; 857 } else if (!strcmp(str, "none")) { 858 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 859 } else if (!strcmp(str, "reset")) { 860 reset = 1; 861 } 862 return 1; 863} 864#endif 865 866static int lp_register(int nr, struct parport *port) 867{ 868 lp_table[nr].dev = parport_register_device(port, "lp", 869 lp_preempt, NULL, NULL, 0, 870 (void *) &lp_table[nr]); 871 if (lp_table[nr].dev == NULL) 872 return 1; 873 lp_table[nr].flags |= LP_EXIST; 874 875 if (reset) 876 lp_reset(nr); 877 878 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 879 "lp%d", nr); 880 881 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 882 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 883 884#ifdef CONFIG_LP_CONSOLE 885 if (!nr) { 886 if (port->modes & PARPORT_MODE_SAFEININT) { 887 register_console(&lpcons); 888 console_registered = port; 889 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 890 } else 891 printk (KERN_ERR "lp%d: cannot run console on %s\n", 892 CONSOLE_LP, port->name); 893 } 894#endif 895 896 return 0; 897} 898 899static void lp_attach (struct parport *port) 900{ 901 unsigned int i; 902 903 switch (parport_nr[0]) { 904 case LP_PARPORT_UNSPEC: 905 case LP_PARPORT_AUTO: 906 if (parport_nr[0] == LP_PARPORT_AUTO && 907 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 908 return; 909 if (lp_count == LP_NO) { 910 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 911 return; 912 } 913 if (!lp_register(lp_count, port)) 914 lp_count++; 915 break; 916 917 default: 918 for (i = 0; i < LP_NO; i++) { 919 if (port->number == parport_nr[i]) { 920 if (!lp_register(i, port)) 921 lp_count++; 922 break; 923 } 924 } 925 break; 926 } 927} 928 929static void lp_detach (struct parport *port) 930{ 931 /* Write this some day. */ 932#ifdef CONFIG_LP_CONSOLE 933 if (console_registered == port) { 934 unregister_console(&lpcons); 935 console_registered = NULL; 936 } 937#endif /* CONFIG_LP_CONSOLE */ 938} 939 940static struct parport_driver lp_driver = { 941 .name = "lp", 942 .attach = lp_attach, 943 .detach = lp_detach, 944}; 945 946static int __init lp_init (void) 947{ 948 int i, err = 0; 949 950 if (parport_nr[0] == LP_PARPORT_OFF) 951 return 0; 952 953 for (i = 0; i < LP_NO; i++) { 954 lp_table[i].dev = NULL; 955 lp_table[i].flags = 0; 956 lp_table[i].chars = LP_INIT_CHAR; 957 lp_table[i].time = LP_INIT_TIME; 958 lp_table[i].wait = LP_INIT_WAIT; 959 lp_table[i].lp_buffer = NULL; 960#ifdef LP_STATS 961 lp_table[i].lastcall = 0; 962 lp_table[i].runchars = 0; 963 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); 964#endif 965 lp_table[i].last_error = 0; 966 init_waitqueue_head (&lp_table[i].waitq); 967 init_waitqueue_head (&lp_table[i].dataq); 968 mutex_init(&lp_table[i].port_mutex); 969 lp_table[i].timeout = 10 * HZ; 970 } 971 972 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { 973 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 974 return -EIO; 975 } 976 977 lp_class = class_create(THIS_MODULE, "printer"); 978 if (IS_ERR(lp_class)) { 979 err = PTR_ERR(lp_class); 980 goto out_reg; 981 } 982 983 if (parport_register_driver (&lp_driver)) { 984 printk (KERN_ERR "lp: unable to register with parport\n"); 985 err = -EIO; 986 goto out_class; 987 } 988 989 if (!lp_count) { 990 printk (KERN_INFO "lp: driver loaded but no devices found\n"); 991#ifndef CONFIG_PARPORT_1284 992 if (parport_nr[0] == LP_PARPORT_AUTO) 993 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 994#endif 995 } 996 997 return 0; 998 999out_class: 1000 class_destroy(lp_class); 1001out_reg: 1002 unregister_chrdev(LP_MAJOR, "lp"); 1003 return err; 1004} 1005 1006static int __init lp_init_module (void) 1007{ 1008 if (parport[0]) { 1009 /* The user gave some parameters. Let's see what they were. */ 1010 if (!strncmp(parport[0], "auto", 4)) 1011 parport_nr[0] = LP_PARPORT_AUTO; 1012 else { 1013 int n; 1014 for (n = 0; n < LP_NO && parport[n]; n++) { 1015 if (!strncmp(parport[n], "none", 4)) 1016 parport_nr[n] = LP_PARPORT_NONE; 1017 else { 1018 char *ep; 1019 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1020 if (ep != parport[n]) 1021 parport_nr[n] = r; 1022 else { 1023 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1024 return -ENODEV; 1025 } 1026 } 1027 } 1028 } 1029 } 1030 1031 return lp_init(); 1032} 1033 1034static void lp_cleanup_module (void) 1035{ 1036 unsigned int offset; 1037 1038 parport_unregister_driver (&lp_driver); 1039 1040#ifdef CONFIG_LP_CONSOLE 1041 unregister_console (&lpcons); 1042#endif 1043 1044 unregister_chrdev(LP_MAJOR, "lp"); 1045 for (offset = 0; offset < LP_NO; offset++) { 1046 if (lp_table[offset].dev == NULL) 1047 continue; 1048 parport_unregister_device(lp_table[offset].dev); 1049 device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); 1050 } 1051 class_destroy(lp_class); 1052} 1053 1054__setup("lp=", lp_setup); 1055module_init(lp_init_module); 1056module_exit(lp_cleanup_module); 1057 1058MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1059MODULE_LICENSE("GPL"); 1060