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