lp.c revision 613655fa39ff6957754fa8ceb8559980920eb8ee
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/mutex.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 DEFINE_MUTEX(lp_mutex); 144static struct lp_struct lp_table[LP_NO]; 145 146static unsigned int lp_count = 0; 147static struct class *lp_class; 148 149#ifdef CONFIG_LP_CONSOLE 150static struct parport *console_registered; 151#endif /* CONFIG_LP_CONSOLE */ 152 153#undef LP_DEBUG 154 155/* Bits used to manage claiming the parport device */ 156#define LP_PREEMPT_REQUEST 1 157#define LP_PARPORT_CLAIMED 2 158 159/* --- low-level port access ----------------------------------- */ 160 161#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 162#define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 163#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 164#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 165 166/* Claim the parport or block trying unless we've already claimed it */ 167static void lp_claim_parport_or_block(struct lp_struct *this_lp) 168{ 169 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 170 parport_claim_or_block (this_lp->dev); 171 } 172} 173 174/* Claim the parport or block trying unless we've already claimed it */ 175static void lp_release_parport(struct lp_struct *this_lp) 176{ 177 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 178 parport_release (this_lp->dev); 179 } 180} 181 182 183 184static int lp_preempt(void *handle) 185{ 186 struct lp_struct *this_lp = (struct lp_struct *)handle; 187 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 188 return (1); 189} 190 191 192/* 193 * Try to negotiate to a new mode; if unsuccessful negotiate to 194 * compatibility mode. Return the mode we ended up in. 195 */ 196static int lp_negotiate(struct parport * port, int mode) 197{ 198 if (parport_negotiate (port, mode) != 0) { 199 mode = IEEE1284_MODE_COMPAT; 200 parport_negotiate (port, mode); 201 } 202 203 return (mode); 204} 205 206static int lp_reset(int minor) 207{ 208 int retval; 209 lp_claim_parport_or_block (&lp_table[minor]); 210 w_ctr(minor, LP_PSELECP); 211 udelay (LP_DELAY); 212 w_ctr(minor, LP_PSELECP | LP_PINITP); 213 retval = r_str(minor); 214 lp_release_parport (&lp_table[minor]); 215 return retval; 216} 217 218static void lp_error (int minor) 219{ 220 DEFINE_WAIT(wait); 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 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 229 schedule_timeout(LP_TIMEOUT_POLLED); 230 finish_wait(&lp_table[minor].waitq, &wait); 231 if (polling) lp_claim_parport_or_block (&lp_table[minor]); 232 else parport_yield_blocking (lp_table[minor].dev); 233} 234 235static int lp_check_status(int minor) 236{ 237 int error = 0; 238 unsigned int last = lp_table[minor].last_error; 239 unsigned char status = r_str(minor); 240 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 241 /* No error. */ 242 last = 0; 243 else if ((status & LP_POUTPA)) { 244 if (last != LP_POUTPA) { 245 last = LP_POUTPA; 246 printk(KERN_INFO "lp%d out of paper\n", minor); 247 } 248 error = -ENOSPC; 249 } else if (!(status & LP_PSELECD)) { 250 if (last != LP_PSELECD) { 251 last = LP_PSELECD; 252 printk(KERN_INFO "lp%d off-line\n", minor); 253 } 254 error = -EIO; 255 } else if (!(status & LP_PERRORP)) { 256 if (last != LP_PERRORP) { 257 last = LP_PERRORP; 258 printk(KERN_INFO "lp%d on fire\n", minor); 259 } 260 error = -EIO; 261 } else { 262 last = 0; /* Come here if LP_CAREFUL is set and no 263 errors are reported. */ 264 } 265 266 lp_table[minor].last_error = last; 267 268 if (last != 0) 269 lp_error(minor); 270 271 return error; 272} 273 274static int lp_wait_ready(int minor, int nonblock) 275{ 276 int error = 0; 277 278 /* If we're not in compatibility mode, we're ready now! */ 279 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 280 return (0); 281 } 282 283 do { 284 error = lp_check_status (minor); 285 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 286 break; 287 if (signal_pending (current)) { 288 error = -EINTR; 289 break; 290 } 291 } while (error); 292 return error; 293} 294 295static ssize_t lp_write(struct file * file, const char __user * buf, 296 size_t count, loff_t *ppos) 297{ 298 unsigned int minor = iminor(file->f_path.dentry->d_inode); 299 struct parport *port = lp_table[minor].dev->port; 300 char *kbuf = lp_table[minor].lp_buffer; 301 ssize_t retv = 0; 302 ssize_t written; 303 size_t copy_size = count; 304 int nonblock = ((file->f_flags & O_NONBLOCK) || 305 (LP_F(minor) & LP_ABORT)); 306 307#ifdef LP_STATS 308 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 309 lp_table[minor].runchars = 0; 310 311 lp_table[minor].lastcall = jiffies; 312#endif 313 314 /* Need to copy the data from user-space. */ 315 if (copy_size > LP_BUFFER_SIZE) 316 copy_size = LP_BUFFER_SIZE; 317 318 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 319 return -EINTR; 320 321 if (copy_from_user (kbuf, buf, copy_size)) { 322 retv = -EFAULT; 323 goto out_unlock; 324 } 325 326 /* Claim Parport or sleep until it becomes available 327 */ 328 lp_claim_parport_or_block (&lp_table[minor]); 329 /* Go to the proper mode. */ 330 lp_table[minor].current_mode = lp_negotiate (port, 331 lp_table[minor].best_mode); 332 333 parport_set_timeout (lp_table[minor].dev, 334 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 335 : lp_table[minor].timeout)); 336 337 if ((retv = lp_wait_ready (minor, nonblock)) == 0) 338 do { 339 /* Write the data. */ 340 written = parport_write (port, kbuf, copy_size); 341 if (written > 0) { 342 copy_size -= written; 343 count -= written; 344 buf += written; 345 retv += written; 346 } 347 348 if (signal_pending (current)) { 349 if (retv == 0) 350 retv = -EINTR; 351 352 break; 353 } 354 355 if (copy_size > 0) { 356 /* incomplete write -> check error ! */ 357 int error; 358 359 parport_negotiate (lp_table[minor].dev->port, 360 IEEE1284_MODE_COMPAT); 361 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 362 363 error = lp_wait_ready (minor, nonblock); 364 365 if (error) { 366 if (retv == 0) 367 retv = error; 368 break; 369 } else if (nonblock) { 370 if (retv == 0) 371 retv = -EAGAIN; 372 break; 373 } 374 375 parport_yield_blocking (lp_table[minor].dev); 376 lp_table[minor].current_mode 377 = lp_negotiate (port, 378 lp_table[minor].best_mode); 379 380 } else if (need_resched()) 381 schedule (); 382 383 if (count) { 384 copy_size = count; 385 if (copy_size > LP_BUFFER_SIZE) 386 copy_size = LP_BUFFER_SIZE; 387 388 if (copy_from_user(kbuf, buf, copy_size)) { 389 if (retv == 0) 390 retv = -EFAULT; 391 break; 392 } 393 } 394 } while (count > 0); 395 396 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 397 &lp_table[minor].bits)) { 398 printk(KERN_INFO "lp%d releasing parport\n", minor); 399 parport_negotiate (lp_table[minor].dev->port, 400 IEEE1284_MODE_COMPAT); 401 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 402 lp_release_parport (&lp_table[minor]); 403 } 404out_unlock: 405 mutex_unlock(&lp_table[minor].port_mutex); 406 407 return retv; 408} 409 410#ifdef CONFIG_PARPORT_1284 411 412/* Status readback conforming to ieee1284 */ 413static ssize_t lp_read(struct file * file, char __user * buf, 414 size_t count, loff_t *ppos) 415{ 416 DEFINE_WAIT(wait); 417 unsigned int minor=iminor(file->f_path.dentry->d_inode); 418 struct parport *port = lp_table[minor].dev->port; 419 ssize_t retval = 0; 420 char *kbuf = lp_table[minor].lp_buffer; 421 int nonblock = ((file->f_flags & O_NONBLOCK) || 422 (LP_F(minor) & LP_ABORT)); 423 424 if (count > LP_BUFFER_SIZE) 425 count = LP_BUFFER_SIZE; 426 427 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 428 return -EINTR; 429 430 lp_claim_parport_or_block (&lp_table[minor]); 431 432 parport_set_timeout (lp_table[minor].dev, 433 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 434 : lp_table[minor].timeout)); 435 436 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 437 if (parport_negotiate (lp_table[minor].dev->port, 438 IEEE1284_MODE_NIBBLE)) { 439 retval = -EIO; 440 goto out; 441 } 442 443 while (retval == 0) { 444 retval = parport_read (port, kbuf, count); 445 446 if (retval > 0) 447 break; 448 449 if (nonblock) { 450 retval = -EAGAIN; 451 break; 452 } 453 454 /* Wait for data. */ 455 456 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 457 parport_negotiate (lp_table[minor].dev->port, 458 IEEE1284_MODE_COMPAT); 459 lp_error (minor); 460 if (parport_negotiate (lp_table[minor].dev->port, 461 IEEE1284_MODE_NIBBLE)) { 462 retval = -EIO; 463 goto out; 464 } 465 } else { 466 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 467 schedule_timeout(LP_TIMEOUT_POLLED); 468 finish_wait(&lp_table[minor].waitq, &wait); 469 } 470 471 if (signal_pending (current)) { 472 retval = -ERESTARTSYS; 473 break; 474 } 475 476 cond_resched (); 477 } 478 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 479 out: 480 lp_release_parport (&lp_table[minor]); 481 482 if (retval > 0 && copy_to_user (buf, kbuf, retval)) 483 retval = -EFAULT; 484 485 mutex_unlock(&lp_table[minor].port_mutex); 486 487 return retval; 488} 489 490#endif /* IEEE 1284 support */ 491 492static int lp_open(struct inode * inode, struct file * file) 493{ 494 unsigned int minor = iminor(inode); 495 int ret = 0; 496 497 mutex_lock(&lp_mutex); 498 if (minor >= LP_NO) { 499 ret = -ENXIO; 500 goto out; 501 } 502 if ((LP_F(minor) & LP_EXIST) == 0) { 503 ret = -ENXIO; 504 goto out; 505 } 506 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) { 507 ret = -EBUSY; 508 goto out; 509 } 510 /* If ABORTOPEN is set and the printer is offline or out of paper, 511 we may still want to open it to perform ioctl()s. Therefore we 512 have commandeered O_NONBLOCK, even though it is being used in 513 a non-standard manner. This is strictly a Linux hack, and 514 should most likely only ever be used by the tunelp application. */ 515 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 516 int status; 517 lp_claim_parport_or_block (&lp_table[minor]); 518 status = r_str(minor); 519 lp_release_parport (&lp_table[minor]); 520 if (status & LP_POUTPA) { 521 printk(KERN_INFO "lp%d out of paper\n", minor); 522 LP_F(minor) &= ~LP_BUSY; 523 ret = -ENOSPC; 524 goto out; 525 } else if (!(status & LP_PSELECD)) { 526 printk(KERN_INFO "lp%d off-line\n", minor); 527 LP_F(minor) &= ~LP_BUSY; 528 ret = -EIO; 529 goto out; 530 } else if (!(status & LP_PERRORP)) { 531 printk(KERN_ERR "lp%d printer error\n", minor); 532 LP_F(minor) &= ~LP_BUSY; 533 ret = -EIO; 534 goto out; 535 } 536 } 537 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 538 if (!lp_table[minor].lp_buffer) { 539 LP_F(minor) &= ~LP_BUSY; 540 ret = -ENOMEM; 541 goto out; 542 } 543 /* Determine if the peripheral supports ECP mode */ 544 lp_claim_parport_or_block (&lp_table[minor]); 545 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 546 !parport_negotiate (lp_table[minor].dev->port, 547 IEEE1284_MODE_ECP)) { 548 printk (KERN_INFO "lp%d: ECP mode\n", minor); 549 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 550 } else { 551 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 552 } 553 /* Leave peripheral in compatibility mode */ 554 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 555 lp_release_parport (&lp_table[minor]); 556 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 557out: 558 mutex_unlock(&lp_mutex); 559 return ret; 560} 561 562static int lp_release(struct inode * inode, struct file * file) 563{ 564 unsigned int minor = iminor(inode); 565 566 lp_claim_parport_or_block (&lp_table[minor]); 567 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 568 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 569 lp_release_parport (&lp_table[minor]); 570 kfree(lp_table[minor].lp_buffer); 571 lp_table[minor].lp_buffer = NULL; 572 LP_F(minor) &= ~LP_BUSY; 573 return 0; 574} 575 576static int lp_do_ioctl(unsigned int minor, unsigned int cmd, 577 unsigned long arg, void __user *argp) 578{ 579 int status; 580 int retval = 0; 581 582#ifdef LP_DEBUG 583 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 584#endif 585 if (minor >= LP_NO) 586 return -ENODEV; 587 if ((LP_F(minor) & LP_EXIST) == 0) 588 return -ENODEV; 589 switch ( cmd ) { 590 case LPTIME: 591 LP_TIME(minor) = arg * HZ/100; 592 break; 593 case LPCHAR: 594 LP_CHAR(minor) = arg; 595 break; 596 case LPABORT: 597 if (arg) 598 LP_F(minor) |= LP_ABORT; 599 else 600 LP_F(minor) &= ~LP_ABORT; 601 break; 602 case LPABORTOPEN: 603 if (arg) 604 LP_F(minor) |= LP_ABORTOPEN; 605 else 606 LP_F(minor) &= ~LP_ABORTOPEN; 607 break; 608 case LPCAREFUL: 609 if (arg) 610 LP_F(minor) |= LP_CAREFUL; 611 else 612 LP_F(minor) &= ~LP_CAREFUL; 613 break; 614 case LPWAIT: 615 LP_WAIT(minor) = arg; 616 break; 617 case LPSETIRQ: 618 return -EINVAL; 619 break; 620 case LPGETIRQ: 621 if (copy_to_user(argp, &LP_IRQ(minor), 622 sizeof(int))) 623 return -EFAULT; 624 break; 625 case LPGETSTATUS: 626 lp_claim_parport_or_block (&lp_table[minor]); 627 status = r_str(minor); 628 lp_release_parport (&lp_table[minor]); 629 630 if (copy_to_user(argp, &status, sizeof(int))) 631 return -EFAULT; 632 break; 633 case LPRESET: 634 lp_reset(minor); 635 break; 636#ifdef LP_STATS 637 case LPGETSTATS: 638 if (copy_to_user(argp, &LP_STAT(minor), 639 sizeof(struct lp_stats))) 640 return -EFAULT; 641 if (capable(CAP_SYS_ADMIN)) 642 memset(&LP_STAT(minor), 0, 643 sizeof(struct lp_stats)); 644 break; 645#endif 646 case LPGETFLAGS: 647 status = LP_F(minor); 648 if (copy_to_user(argp, &status, sizeof(int))) 649 return -EFAULT; 650 break; 651 652 default: 653 retval = -EINVAL; 654 } 655 return retval; 656} 657 658static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout) 659{ 660 long to_jiffies; 661 662 /* Convert to jiffies, place in lp_table */ 663 if ((par_timeout->tv_sec < 0) || 664 (par_timeout->tv_usec < 0)) { 665 return -EINVAL; 666 } 667 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ); 668 to_jiffies += par_timeout->tv_sec * (long) HZ; 669 if (to_jiffies <= 0) { 670 return -EINVAL; 671 } 672 lp_table[minor].timeout = to_jiffies; 673 return 0; 674} 675 676static long lp_ioctl(struct file *file, unsigned int cmd, 677 unsigned long arg) 678{ 679 unsigned int minor; 680 struct timeval par_timeout; 681 int ret; 682 683 minor = iminor(file->f_path.dentry->d_inode); 684 mutex_lock(&lp_mutex); 685 switch (cmd) { 686 case LPSETTIMEOUT: 687 if (copy_from_user(&par_timeout, (void __user *)arg, 688 sizeof (struct timeval))) { 689 ret = -EFAULT; 690 break; 691 } 692 ret = lp_set_timeout(minor, &par_timeout); 693 break; 694 default: 695 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 696 break; 697 } 698 mutex_unlock(&lp_mutex); 699 700 return ret; 701} 702 703#ifdef CONFIG_COMPAT 704static long lp_compat_ioctl(struct file *file, unsigned int cmd, 705 unsigned long arg) 706{ 707 unsigned int minor; 708 struct timeval par_timeout; 709 struct compat_timeval __user *tc; 710 int ret; 711 712 minor = iminor(file->f_path.dentry->d_inode); 713 mutex_lock(&lp_mutex); 714 switch (cmd) { 715 case LPSETTIMEOUT: 716 tc = compat_ptr(arg); 717 if (get_user(par_timeout.tv_sec, &tc->tv_sec) || 718 get_user(par_timeout.tv_usec, &tc->tv_usec)) { 719 ret = -EFAULT; 720 break; 721 } 722 ret = lp_set_timeout(minor, &par_timeout); 723 break; 724#ifdef LP_STATS 725 case LPGETSTATS: 726 /* FIXME: add an implementation if you set LP_STATS */ 727 ret = -EINVAL; 728 break; 729#endif 730 default: 731 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 732 break; 733 } 734 mutex_unlock(&lp_mutex); 735 736 return ret; 737} 738#endif 739 740static const struct file_operations lp_fops = { 741 .owner = THIS_MODULE, 742 .write = lp_write, 743 .unlocked_ioctl = lp_ioctl, 744#ifdef CONFIG_COMPAT 745 .compat_ioctl = lp_compat_ioctl, 746#endif 747 .open = lp_open, 748 .release = lp_release, 749#ifdef CONFIG_PARPORT_1284 750 .read = lp_read, 751#endif 752}; 753 754/* --- support for console on the line printer ----------------- */ 755 756#ifdef CONFIG_LP_CONSOLE 757 758#define CONSOLE_LP 0 759 760/* If the printer is out of paper, we can either lose the messages or 761 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 762 * non-zero to get the latter behaviour. */ 763#define CONSOLE_LP_STRICT 1 764 765/* The console must be locked when we get here. */ 766 767static void lp_console_write (struct console *co, const char *s, 768 unsigned count) 769{ 770 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 771 struct parport *port = dev->port; 772 ssize_t written; 773 774 if (parport_claim (dev)) 775 /* Nothing we can do. */ 776 return; 777 778 parport_set_timeout (dev, 0); 779 780 /* Go to compatibility mode. */ 781 parport_negotiate (port, IEEE1284_MODE_COMPAT); 782 783 do { 784 /* Write the data, converting LF->CRLF as we go. */ 785 ssize_t canwrite = count; 786 char *lf = memchr (s, '\n', count); 787 if (lf) 788 canwrite = lf - s; 789 790 if (canwrite > 0) { 791 written = parport_write (port, s, canwrite); 792 793 if (written <= 0) 794 continue; 795 796 s += written; 797 count -= written; 798 canwrite -= written; 799 } 800 801 if (lf && canwrite <= 0) { 802 const char *crlf = "\r\n"; 803 int i = 2; 804 805 /* Dodge the original '\n', and put '\r\n' instead. */ 806 s++; 807 count--; 808 do { 809 written = parport_write (port, crlf, i); 810 if (written > 0) 811 i -= written, crlf += written; 812 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 813 } 814 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 815 816 parport_release (dev); 817} 818 819static struct console lpcons = { 820 .name = "lp", 821 .write = lp_console_write, 822 .flags = CON_PRINTBUFFER, 823}; 824 825#endif /* console on line printer */ 826 827/* --- initialisation code ------------------------------------- */ 828 829static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 830static char *parport[LP_NO]; 831static int reset; 832 833module_param_array(parport, charp, NULL, 0); 834module_param(reset, bool, 0); 835 836#ifndef MODULE 837static int __init lp_setup (char *str) 838{ 839 static int parport_ptr; 840 int x; 841 842 if (get_option(&str, &x)) { 843 if (x == 0) { 844 /* disable driver on "lp=" or "lp=0" */ 845 parport_nr[0] = LP_PARPORT_OFF; 846 } else { 847 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 848 return 0; 849 } 850 } else if (!strncmp(str, "parport", 7)) { 851 int n = simple_strtoul(str+7, NULL, 10); 852 if (parport_ptr < LP_NO) 853 parport_nr[parport_ptr++] = n; 854 else 855 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 856 str); 857 } else if (!strcmp(str, "auto")) { 858 parport_nr[0] = LP_PARPORT_AUTO; 859 } else if (!strcmp(str, "none")) { 860 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 861 } else if (!strcmp(str, "reset")) { 862 reset = 1; 863 } 864 return 1; 865} 866#endif 867 868static int lp_register(int nr, struct parport *port) 869{ 870 lp_table[nr].dev = parport_register_device(port, "lp", 871 lp_preempt, NULL, NULL, 0, 872 (void *) &lp_table[nr]); 873 if (lp_table[nr].dev == NULL) 874 return 1; 875 lp_table[nr].flags |= LP_EXIST; 876 877 if (reset) 878 lp_reset(nr); 879 880 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 881 "lp%d", nr); 882 883 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 884 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 885 886#ifdef CONFIG_LP_CONSOLE 887 if (!nr) { 888 if (port->modes & PARPORT_MODE_SAFEININT) { 889 register_console(&lpcons); 890 console_registered = port; 891 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 892 } else 893 printk (KERN_ERR "lp%d: cannot run console on %s\n", 894 CONSOLE_LP, port->name); 895 } 896#endif 897 898 return 0; 899} 900 901static void lp_attach (struct parport *port) 902{ 903 unsigned int i; 904 905 switch (parport_nr[0]) { 906 case LP_PARPORT_UNSPEC: 907 case LP_PARPORT_AUTO: 908 if (parport_nr[0] == LP_PARPORT_AUTO && 909 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 910 return; 911 if (lp_count == LP_NO) { 912 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 913 return; 914 } 915 if (!lp_register(lp_count, port)) 916 lp_count++; 917 break; 918 919 default: 920 for (i = 0; i < LP_NO; i++) { 921 if (port->number == parport_nr[i]) { 922 if (!lp_register(i, port)) 923 lp_count++; 924 break; 925 } 926 } 927 break; 928 } 929} 930 931static void lp_detach (struct parport *port) 932{ 933 /* Write this some day. */ 934#ifdef CONFIG_LP_CONSOLE 935 if (console_registered == port) { 936 unregister_console(&lpcons); 937 console_registered = NULL; 938 } 939#endif /* CONFIG_LP_CONSOLE */ 940} 941 942static struct parport_driver lp_driver = { 943 .name = "lp", 944 .attach = lp_attach, 945 .detach = lp_detach, 946}; 947 948static int __init lp_init (void) 949{ 950 int i, err = 0; 951 952 if (parport_nr[0] == LP_PARPORT_OFF) 953 return 0; 954 955 for (i = 0; i < LP_NO; i++) { 956 lp_table[i].dev = NULL; 957 lp_table[i].flags = 0; 958 lp_table[i].chars = LP_INIT_CHAR; 959 lp_table[i].time = LP_INIT_TIME; 960 lp_table[i].wait = LP_INIT_WAIT; 961 lp_table[i].lp_buffer = NULL; 962#ifdef LP_STATS 963 lp_table[i].lastcall = 0; 964 lp_table[i].runchars = 0; 965 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); 966#endif 967 lp_table[i].last_error = 0; 968 init_waitqueue_head (&lp_table[i].waitq); 969 init_waitqueue_head (&lp_table[i].dataq); 970 mutex_init(&lp_table[i].port_mutex); 971 lp_table[i].timeout = 10 * HZ; 972 } 973 974 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { 975 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 976 return -EIO; 977 } 978 979 lp_class = class_create(THIS_MODULE, "printer"); 980 if (IS_ERR(lp_class)) { 981 err = PTR_ERR(lp_class); 982 goto out_reg; 983 } 984 985 if (parport_register_driver (&lp_driver)) { 986 printk (KERN_ERR "lp: unable to register with parport\n"); 987 err = -EIO; 988 goto out_class; 989 } 990 991 if (!lp_count) { 992 printk (KERN_INFO "lp: driver loaded but no devices found\n"); 993#ifndef CONFIG_PARPORT_1284 994 if (parport_nr[0] == LP_PARPORT_AUTO) 995 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 996#endif 997 } 998 999 return 0; 1000 1001out_class: 1002 class_destroy(lp_class); 1003out_reg: 1004 unregister_chrdev(LP_MAJOR, "lp"); 1005 return err; 1006} 1007 1008static int __init lp_init_module (void) 1009{ 1010 if (parport[0]) { 1011 /* The user gave some parameters. Let's see what they were. */ 1012 if (!strncmp(parport[0], "auto", 4)) 1013 parport_nr[0] = LP_PARPORT_AUTO; 1014 else { 1015 int n; 1016 for (n = 0; n < LP_NO && parport[n]; n++) { 1017 if (!strncmp(parport[n], "none", 4)) 1018 parport_nr[n] = LP_PARPORT_NONE; 1019 else { 1020 char *ep; 1021 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1022 if (ep != parport[n]) 1023 parport_nr[n] = r; 1024 else { 1025 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1026 return -ENODEV; 1027 } 1028 } 1029 } 1030 } 1031 } 1032 1033 return lp_init(); 1034} 1035 1036static void lp_cleanup_module (void) 1037{ 1038 unsigned int offset; 1039 1040 parport_unregister_driver (&lp_driver); 1041 1042#ifdef CONFIG_LP_CONSOLE 1043 unregister_console (&lpcons); 1044#endif 1045 1046 unregister_chrdev(LP_MAJOR, "lp"); 1047 for (offset = 0; offset < LP_NO; offset++) { 1048 if (lp_table[offset].dev == NULL) 1049 continue; 1050 parport_unregister_device(lp_table[offset].dev); 1051 device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); 1052 } 1053 class_destroy(lp_class); 1054} 1055 1056__setup("lp=", lp_setup); 1057module_init(lp_init_module); 1058module_exit(lp_cleanup_module); 1059 1060MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1061MODULE_LICENSE("GPL"); 1062