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