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