lp.c revision 62322d2554d2f9680c8ace7bbf1f97d8fa84ad1a
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 145static struct lp_struct lp_table[LP_NO]; 146 147static unsigned int lp_count = 0; 148static struct class *lp_class; 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 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 236static 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 275static 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 296static 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_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 } 405out_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 */ 414static 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_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 493static 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 = (char *) 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 550static 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 564static 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 669static 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 693static 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 745static 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 755static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 756static char *parport[LP_NO] = { NULL, }; 757static int reset = 0; 758 759module_param_array(parport, charp, NULL, 0); 760module_param(reset, bool, 0); 761 762#ifndef MODULE 763static 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 794static 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 827static 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 858static 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 869static struct parport_driver lp_driver = { 870 .name = "lp", 871 .attach = lp_attach, 872 .detach = lp_detach, 873}; 874 875static 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_devfs; 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 928out_class: 929 class_destroy(lp_class); 930out_devfs: 931 unregister_chrdev(LP_MAJOR, "lp"); 932 return err; 933} 934 935static 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 963static 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); 984module_init(lp_init_module); 985module_exit(lp_cleanup_module); 986 987MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 988MODULE_LICENSE("GPL"); 989