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> 129 130 #include <linux/parport.h> 131 #undef LP_STATS 132 #include <linux/lp.h> 133 134 #include <asm/irq.h> 135 #include <asm/uaccess.h> 136 #include <asm/system.h> 137 138 /* if you have more than 8 printers, remember to increase LP_NO */ 139 #define LP_NO 8 140 141 static struct lp_struct lp_table[LP_NO]; 142 143 static unsigned int lp_count = 0; 144 static struct class *lp_class; 145 146 #ifdef CONFIG_LP_CONSOLE 147 static struct parport *console_registered; 148 #endif /* CONFIG_LP_CONSOLE */ 149 150 #undef LP_DEBUG 151 152 /* Bits used to manage claiming the parport device */ 153 #define LP_PREEMPT_REQUEST 1 154 #define LP_PARPORT_CLAIMED 2 155 156 /* --- low-level port access ----------------------------------- */ 157 158 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 159 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 160 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 161 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 162 163 /* Claim the parport or block trying unless we've already claimed it */ 164 static void lp_claim_parport_or_block(struct lp_struct *this_lp) 165 { 166 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 167 parport_claim_or_block (this_lp->dev); 168 } 169 } 170 171 /* Claim the parport or block trying unless we've already claimed it */ 172 static void lp_release_parport(struct lp_struct *this_lp) 173 { 174 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 175 parport_release (this_lp->dev); 176 } 177 } 178 179 180 181 static int lp_preempt(void *handle) 182 { 183 struct lp_struct *this_lp = (struct lp_struct *)handle; 184 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 185 return (1); 186 } 187 188 189 /* 190 * Try to negotiate to a new mode; if unsuccessful negotiate to 191 * compatibility mode. Return the mode we ended up in. 192 */ 193 static int lp_negotiate(struct parport * port, int mode) 194 { 195 if (parport_negotiate (port, mode) != 0) { 196 mode = IEEE1284_MODE_COMPAT; 197 parport_negotiate (port, mode); 198 } 199 200 return (mode); 201 } 202 203 static int lp_reset(int minor) 204 { 205 int retval; 206 lp_claim_parport_or_block (&lp_table[minor]); 207 w_ctr(minor, LP_PSELECP); 208 udelay (LP_DELAY); 209 w_ctr(minor, LP_PSELECP | LP_PINITP); 210 retval = r_str(minor); 211 lp_release_parport (&lp_table[minor]); 212 return retval; 213 } 214 215 static void lp_error (int minor) 216 { 217 DEFINE_WAIT(wait); 218 int polling; 219 220 if (LP_F(minor) & LP_ABORT) 221 return; 222 223 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; 224 if (polling) lp_release_parport (&lp_table[minor]); 225 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 226 schedule_timeout(LP_TIMEOUT_POLLED); 227 finish_wait(&lp_table[minor].waitq, &wait); 228 if (polling) lp_claim_parport_or_block (&lp_table[minor]); 229 else parport_yield_blocking (lp_table[minor].dev); 230 } 231 232 static int lp_check_status(int minor) 233 { 234 int error = 0; 235 unsigned int last = lp_table[minor].last_error; 236 unsigned char status = r_str(minor); 237 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 238 /* No error. */ 239 last = 0; 240 else if ((status & LP_POUTPA)) { 241 if (last != LP_POUTPA) { 242 last = LP_POUTPA; 243 printk(KERN_INFO "lp%d out of paper\n", minor); 244 } 245 error = -ENOSPC; 246 } else if (!(status & LP_PSELECD)) { 247 if (last != LP_PSELECD) { 248 last = LP_PSELECD; 249 printk(KERN_INFO "lp%d off-line\n", minor); 250 } 251 error = -EIO; 252 } else if (!(status & LP_PERRORP)) { 253 if (last != LP_PERRORP) { 254 last = LP_PERRORP; 255 printk(KERN_INFO "lp%d on fire\n", minor); 256 } 257 error = -EIO; 258 } else { 259 last = 0; /* Come here if LP_CAREFUL is set and no 260 errors are reported. */ 261 } 262 263 lp_table[minor].last_error = last; 264 265 if (last != 0) 266 lp_error(minor); 267 268 return error; 269 } 270 271 static int lp_wait_ready(int minor, int nonblock) 272 { 273 int error = 0; 274 275 /* If we're not in compatibility mode, we're ready now! */ 276 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 277 return (0); 278 } 279 280 do { 281 error = lp_check_status (minor); 282 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 283 break; 284 if (signal_pending (current)) { 285 error = -EINTR; 286 break; 287 } 288 } while (error); 289 return error; 290 } 291 292 static ssize_t lp_write(struct file * file, const char __user * buf, 293 size_t count, loff_t *ppos) 294 { 295 unsigned int minor = iminor(file->f_path.dentry->d_inode); 296 struct parport *port = lp_table[minor].dev->port; 297 char *kbuf = lp_table[minor].lp_buffer; 298 ssize_t retv = 0; 299 ssize_t written; 300 size_t copy_size = count; 301 int nonblock = ((file->f_flags & O_NONBLOCK) || 302 (LP_F(minor) & LP_ABORT)); 303 304 #ifdef LP_STATS 305 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 306 lp_table[minor].runchars = 0; 307 308 lp_table[minor].lastcall = jiffies; 309 #endif 310 311 /* Need to copy the data from user-space. */ 312 if (copy_size > LP_BUFFER_SIZE) 313 copy_size = LP_BUFFER_SIZE; 314 315 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 316 return -EINTR; 317 318 if (copy_from_user (kbuf, buf, copy_size)) { 319 retv = -EFAULT; 320 goto out_unlock; 321 } 322 323 /* Claim Parport or sleep until it becomes available 324 */ 325 lp_claim_parport_or_block (&lp_table[minor]); 326 /* Go to the proper mode. */ 327 lp_table[minor].current_mode = lp_negotiate (port, 328 lp_table[minor].best_mode); 329 330 parport_set_timeout (lp_table[minor].dev, 331 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 332 : lp_table[minor].timeout)); 333 334 if ((retv = lp_wait_ready (minor, nonblock)) == 0) 335 do { 336 /* Write the data. */ 337 written = parport_write (port, kbuf, copy_size); 338 if (written > 0) { 339 copy_size -= written; 340 count -= written; 341 buf += written; 342 retv += written; 343 } 344 345 if (signal_pending (current)) { 346 if (retv == 0) 347 retv = -EINTR; 348 349 break; 350 } 351 352 if (copy_size > 0) { 353 /* incomplete write -> check error ! */ 354 int error; 355 356 parport_negotiate (lp_table[minor].dev->port, 357 IEEE1284_MODE_COMPAT); 358 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 359 360 error = lp_wait_ready (minor, nonblock); 361 362 if (error) { 363 if (retv == 0) 364 retv = error; 365 break; 366 } else if (nonblock) { 367 if (retv == 0) 368 retv = -EAGAIN; 369 break; 370 } 371 372 parport_yield_blocking (lp_table[minor].dev); 373 lp_table[minor].current_mode 374 = lp_negotiate (port, 375 lp_table[minor].best_mode); 376 377 } else if (need_resched()) 378 schedule (); 379 380 if (count) { 381 copy_size = count; 382 if (copy_size > LP_BUFFER_SIZE) 383 copy_size = LP_BUFFER_SIZE; 384 385 if (copy_from_user(kbuf, buf, copy_size)) { 386 if (retv == 0) 387 retv = -EFAULT; 388 break; 389 } 390 } 391 } while (count > 0); 392 393 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 394 &lp_table[minor].bits)) { 395 printk(KERN_INFO "lp%d releasing parport\n", minor); 396 parport_negotiate (lp_table[minor].dev->port, 397 IEEE1284_MODE_COMPAT); 398 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 399 lp_release_parport (&lp_table[minor]); 400 } 401 out_unlock: 402 mutex_unlock(&lp_table[minor].port_mutex); 403 404 return retv; 405 } 406 407 #ifdef CONFIG_PARPORT_1284 408 409 /* Status readback conforming to ieee1284 */ 410 static ssize_t lp_read(struct file * file, char __user * buf, 411 size_t count, loff_t *ppos) 412 { 413 DEFINE_WAIT(wait); 414 unsigned int minor=iminor(file->f_path.dentry->d_inode); 415 struct parport *port = lp_table[minor].dev->port; 416 ssize_t retval = 0; 417 char *kbuf = lp_table[minor].lp_buffer; 418 int nonblock = ((file->f_flags & O_NONBLOCK) || 419 (LP_F(minor) & LP_ABORT)); 420 421 if (count > LP_BUFFER_SIZE) 422 count = LP_BUFFER_SIZE; 423 424 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 425 return -EINTR; 426 427 lp_claim_parport_or_block (&lp_table[minor]); 428 429 parport_set_timeout (lp_table[minor].dev, 430 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 431 : lp_table[minor].timeout)); 432 433 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 434 if (parport_negotiate (lp_table[minor].dev->port, 435 IEEE1284_MODE_NIBBLE)) { 436 retval = -EIO; 437 goto out; 438 } 439 440 while (retval == 0) { 441 retval = parport_read (port, kbuf, count); 442 443 if (retval > 0) 444 break; 445 446 if (nonblock) { 447 retval = -EAGAIN; 448 break; 449 } 450 451 /* Wait for data. */ 452 453 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 454 parport_negotiate (lp_table[minor].dev->port, 455 IEEE1284_MODE_COMPAT); 456 lp_error (minor); 457 if (parport_negotiate (lp_table[minor].dev->port, 458 IEEE1284_MODE_NIBBLE)) { 459 retval = -EIO; 460 goto out; 461 } 462 } else { 463 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 464 schedule_timeout(LP_TIMEOUT_POLLED); 465 finish_wait(&lp_table[minor].waitq, &wait); 466 } 467 468 if (signal_pending (current)) { 469 retval = -ERESTARTSYS; 470 break; 471 } 472 473 cond_resched (); 474 } 475 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 476 out: 477 lp_release_parport (&lp_table[minor]); 478 479 if (retval > 0 && copy_to_user (buf, kbuf, retval)) 480 retval = -EFAULT; 481 482 mutex_unlock(&lp_table[minor].port_mutex); 483 484 return retval; 485 } 486 487 #endif /* IEEE 1284 support */ 488 489 static int lp_open(struct inode * inode, struct file * file) 490 { 491 unsigned int minor = iminor(inode); 492 493 if (minor >= LP_NO) 494 return -ENXIO; 495 if ((LP_F(minor) & LP_EXIST) == 0) 496 return -ENXIO; 497 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) 498 return -EBUSY; 499 500 /* If ABORTOPEN is set and the printer is offline or out of paper, 501 we may still want to open it to perform ioctl()s. Therefore we 502 have commandeered O_NONBLOCK, even though it is being used in 503 a non-standard manner. This is strictly a Linux hack, and 504 should most likely only ever be used by the tunelp application. */ 505 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 506 int status; 507 lp_claim_parport_or_block (&lp_table[minor]); 508 status = r_str(minor); 509 lp_release_parport (&lp_table[minor]); 510 if (status & LP_POUTPA) { 511 printk(KERN_INFO "lp%d out of paper\n", minor); 512 LP_F(minor) &= ~LP_BUSY; 513 return -ENOSPC; 514 } else if (!(status & LP_PSELECD)) { 515 printk(KERN_INFO "lp%d off-line\n", minor); 516 LP_F(minor) &= ~LP_BUSY; 517 return -EIO; 518 } else if (!(status & LP_PERRORP)) { 519 printk(KERN_ERR "lp%d printer error\n", minor); 520 LP_F(minor) &= ~LP_BUSY; 521 return -EIO; 522 } 523 } 524 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 525 if (!lp_table[minor].lp_buffer) { 526 LP_F(minor) &= ~LP_BUSY; 527 return -ENOMEM; 528 } 529 /* Determine if the peripheral supports ECP mode */ 530 lp_claim_parport_or_block (&lp_table[minor]); 531 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 532 !parport_negotiate (lp_table[minor].dev->port, 533 IEEE1284_MODE_ECP)) { 534 printk (KERN_INFO "lp%d: ECP mode\n", minor); 535 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 536 } else { 537 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 538 } 539 /* Leave peripheral in compatibility mode */ 540 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 541 lp_release_parport (&lp_table[minor]); 542 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 543 return 0; 544 } 545 546 static int lp_release(struct inode * inode, struct file * file) 547 { 548 unsigned int minor = iminor(inode); 549 550 lp_claim_parport_or_block (&lp_table[minor]); 551 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 552 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 553 lp_release_parport (&lp_table[minor]); 554 kfree(lp_table[minor].lp_buffer); 555 lp_table[minor].lp_buffer = NULL; 556 LP_F(minor) &= ~LP_BUSY; 557 return 0; 558 } 559 560 static int lp_ioctl(struct inode *inode, struct file *file, 561 unsigned int cmd, unsigned long arg) 562 { 563 unsigned int minor = iminor(inode); 564 int status; 565 int retval = 0; 566 void __user *argp = (void __user *)arg; 567 568 #ifdef LP_DEBUG 569 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 570 #endif 571 if (minor >= LP_NO) 572 return -ENODEV; 573 if ((LP_F(minor) & LP_EXIST) == 0) 574 return -ENODEV; 575 switch ( cmd ) { 576 struct timeval par_timeout; 577 long to_jiffies; 578 579 case LPTIME: 580 LP_TIME(minor) = arg * HZ/100; 581 break; 582 case LPCHAR: 583 LP_CHAR(minor) = arg; 584 break; 585 case LPABORT: 586 if (arg) 587 LP_F(minor) |= LP_ABORT; 588 else 589 LP_F(minor) &= ~LP_ABORT; 590 break; 591 case LPABORTOPEN: 592 if (arg) 593 LP_F(minor) |= LP_ABORTOPEN; 594 else 595 LP_F(minor) &= ~LP_ABORTOPEN; 596 break; 597 case LPCAREFUL: 598 if (arg) 599 LP_F(minor) |= LP_CAREFUL; 600 else 601 LP_F(minor) &= ~LP_CAREFUL; 602 break; 603 case LPWAIT: 604 LP_WAIT(minor) = arg; 605 break; 606 case LPSETIRQ: 607 return -EINVAL; 608 break; 609 case LPGETIRQ: 610 if (copy_to_user(argp, &LP_IRQ(minor), 611 sizeof(int))) 612 return -EFAULT; 613 break; 614 case LPGETSTATUS: 615 lp_claim_parport_or_block (&lp_table[minor]); 616 status = r_str(minor); 617 lp_release_parport (&lp_table[minor]); 618 619 if (copy_to_user(argp, &status, sizeof(int))) 620 return -EFAULT; 621 break; 622 case LPRESET: 623 lp_reset(minor); 624 break; 625 #ifdef LP_STATS 626 case LPGETSTATS: 627 if (copy_to_user(argp, &LP_STAT(minor), 628 sizeof(struct lp_stats))) 629 return -EFAULT; 630 if (capable(CAP_SYS_ADMIN)) 631 memset(&LP_STAT(minor), 0, 632 sizeof(struct lp_stats)); 633 break; 634 #endif 635 case LPGETFLAGS: 636 status = LP_F(minor); 637 if (copy_to_user(argp, &status, sizeof(int))) 638 return -EFAULT; 639 break; 640 641 case LPSETTIMEOUT: 642 if (copy_from_user (&par_timeout, argp, 643 sizeof (struct timeval))) { 644 return -EFAULT; 645 } 646 /* Convert to jiffies, place in lp_table */ 647 if ((par_timeout.tv_sec < 0) || 648 (par_timeout.tv_usec < 0)) { 649 return -EINVAL; 650 } 651 to_jiffies = DIV_ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 652 to_jiffies += par_timeout.tv_sec * (long) HZ; 653 if (to_jiffies <= 0) { 654 return -EINVAL; 655 } 656 lp_table[minor].timeout = to_jiffies; 657 break; 658 659 default: 660 retval = -EINVAL; 661 } 662 return retval; 663 } 664 665 static const struct file_operations lp_fops = { 666 .owner = THIS_MODULE, 667 .write = lp_write, 668 .ioctl = lp_ioctl, 669 .open = lp_open, 670 .release = lp_release, 671 #ifdef CONFIG_PARPORT_1284 672 .read = lp_read, 673 #endif 674 }; 675 676 /* --- support for console on the line printer ----------------- */ 677 678 #ifdef CONFIG_LP_CONSOLE 679 680 #define CONSOLE_LP 0 681 682 /* If the printer is out of paper, we can either lose the messages or 683 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 684 * non-zero to get the latter behaviour. */ 685 #define CONSOLE_LP_STRICT 1 686 687 /* The console must be locked when we get here. */ 688 689 static void lp_console_write (struct console *co, const char *s, 690 unsigned count) 691 { 692 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 693 struct parport *port = dev->port; 694 ssize_t written; 695 696 if (parport_claim (dev)) 697 /* Nothing we can do. */ 698 return; 699 700 parport_set_timeout (dev, 0); 701 702 /* Go to compatibility mode. */ 703 parport_negotiate (port, IEEE1284_MODE_COMPAT); 704 705 do { 706 /* Write the data, converting LF->CRLF as we go. */ 707 ssize_t canwrite = count; 708 char *lf = memchr (s, '\n', count); 709 if (lf) 710 canwrite = lf - s; 711 712 if (canwrite > 0) { 713 written = parport_write (port, s, canwrite); 714 715 if (written <= 0) 716 continue; 717 718 s += written; 719 count -= written; 720 canwrite -= written; 721 } 722 723 if (lf && canwrite <= 0) { 724 const char *crlf = "\r\n"; 725 int i = 2; 726 727 /* Dodge the original '\n', and put '\r\n' instead. */ 728 s++; 729 count--; 730 do { 731 written = parport_write (port, crlf, i); 732 if (written > 0) 733 i -= written, crlf += written; 734 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 735 } 736 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 737 738 parport_release (dev); 739 } 740 741 static struct console lpcons = { 742 .name = "lp", 743 .write = lp_console_write, 744 .flags = CON_PRINTBUFFER, 745 }; 746 747 #endif /* console on line printer */ 748 749 /* --- initialisation code ------------------------------------- */ 750 751 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 752 static char *parport[LP_NO]; 753 static int reset; 754 755 module_param_array(parport, charp, NULL, 0); 756 module_param(reset, bool, 0); 757 758 #ifndef MODULE 759 static int __init lp_setup (char *str) 760 { 761 static int parport_ptr; 762 int x; 763 764 if (get_option(&str, &x)) { 765 if (x == 0) { 766 /* disable driver on "lp=" or "lp=0" */ 767 parport_nr[0] = LP_PARPORT_OFF; 768 } else { 769 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 770 return 0; 771 } 772 } else if (!strncmp(str, "parport", 7)) { 773 int n = simple_strtoul(str+7, NULL, 10); 774 if (parport_ptr < LP_NO) 775 parport_nr[parport_ptr++] = n; 776 else 777 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 778 str); 779 } else if (!strcmp(str, "auto")) { 780 parport_nr[0] = LP_PARPORT_AUTO; 781 } else if (!strcmp(str, "none")) { 782 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 783 } else if (!strcmp(str, "reset")) { 784 reset = 1; 785 } 786 return 1; 787 } 788 #endif 789 790 static int lp_register(int nr, struct parport *port) 791 { 792 lp_table[nr].dev = parport_register_device(port, "lp", 793 lp_preempt, NULL, NULL, 0, 794 (void *) &lp_table[nr]); 795 if (lp_table[nr].dev == NULL) 796 return 1; 797 lp_table[nr].flags |= LP_EXIST; 798 799 if (reset) 800 lp_reset(nr); 801 802 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), "lp%d", nr); 803 804 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 805 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 806 807 #ifdef CONFIG_LP_CONSOLE 808 if (!nr) { 809 if (port->modes & PARPORT_MODE_SAFEININT) { 810 register_console(&lpcons); 811 console_registered = port; 812 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 813 } else 814 printk (KERN_ERR "lp%d: cannot run console on %s\n", 815 CONSOLE_LP, port->name); 816 } 817 #endif 818 819 return 0; 820 } 821 822 static void lp_attach (struct parport *port) 823 { 824 unsigned int i; 825 826 switch (parport_nr[0]) { 827 case LP_PARPORT_UNSPEC: 828 case LP_PARPORT_AUTO: 829 if (parport_nr[0] == LP_PARPORT_AUTO && 830 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 831 return; 832 if (lp_count == LP_NO) { 833 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 834 return; 835 } 836 if (!lp_register(lp_count, port)) 837 lp_count++; 838 break; 839 840 default: 841 for (i = 0; i < LP_NO; i++) { 842 if (port->number == parport_nr[i]) { 843 if (!lp_register(i, port)) 844 lp_count++; 845 break; 846 } 847 } 848 break; 849 } 850 } 851 852 static void lp_detach (struct parport *port) 853 { 854 /* Write this some day. */ 855 #ifdef CONFIG_LP_CONSOLE 856 if (console_registered == port) { 857 unregister_console(&lpcons); 858 console_registered = NULL; 859 } 860 #endif /* CONFIG_LP_CONSOLE */ 861 } 862 863 static struct parport_driver lp_driver = { 864 .name = "lp", 865 .attach = lp_attach, 866 .detach = lp_detach, 867 }; 868 869 static int __init lp_init (void) 870 { 871 int i, err = 0; 872 873 if (parport_nr[0] == LP_PARPORT_OFF) 874 return 0; 875 876 for (i = 0; i < LP_NO; i++) { 877 lp_table[i].dev = NULL; 878 lp_table[i].flags = 0; 879 lp_table[i].chars = LP_INIT_CHAR; 880 lp_table[i].time = LP_INIT_TIME; 881 lp_table[i].wait = LP_INIT_WAIT; 882 lp_table[i].lp_buffer = NULL; 883 #ifdef LP_STATS 884 lp_table[i].lastcall = 0; 885 lp_table[i].runchars = 0; 886 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); 887 #endif 888 lp_table[i].last_error = 0; 889 init_waitqueue_head (&lp_table[i].waitq); 890 init_waitqueue_head (&lp_table[i].dataq); 891 mutex_init(&lp_table[i].port_mutex); 892 lp_table[i].timeout = 10 * HZ; 893 } 894 895 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { 896 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 897 return -EIO; 898 } 899 900 lp_class = class_create(THIS_MODULE, "printer"); 901 if (IS_ERR(lp_class)) { 902 err = PTR_ERR(lp_class); 903 goto out_reg; 904 } 905 906 if (parport_register_driver (&lp_driver)) { 907 printk (KERN_ERR "lp: unable to register with parport\n"); 908 err = -EIO; 909 goto out_class; 910 } 911 912 if (!lp_count) { 913 printk (KERN_INFO "lp: driver loaded but no devices found\n"); 914 #ifndef CONFIG_PARPORT_1284 915 if (parport_nr[0] == LP_PARPORT_AUTO) 916 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 917 #endif 918 } 919 920 return 0; 921 922 out_class: 923 class_destroy(lp_class); 924 out_reg: 925 unregister_chrdev(LP_MAJOR, "lp"); 926 return err; 927 } 928 929 static int __init lp_init_module (void) 930 { 931 if (parport[0]) { 932 /* The user gave some parameters. Let's see what they were. */ 933 if (!strncmp(parport[0], "auto", 4)) 934 parport_nr[0] = LP_PARPORT_AUTO; 935 else { 936 int n; 937 for (n = 0; n < LP_NO && parport[n]; n++) { 938 if (!strncmp(parport[n], "none", 4)) 939 parport_nr[n] = LP_PARPORT_NONE; 940 else { 941 char *ep; 942 unsigned long r = simple_strtoul(parport[n], &ep, 0); 943 if (ep != parport[n]) 944 parport_nr[n] = r; 945 else { 946 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 947 return -ENODEV; 948 } 949 } 950 } 951 } 952 } 953 954 return lp_init(); 955 } 956 957 static void lp_cleanup_module (void) 958 { 959 unsigned int offset; 960 961 parport_unregister_driver (&lp_driver); 962 963 #ifdef CONFIG_LP_CONSOLE 964 unregister_console (&lpcons); 965 #endif 966 967 unregister_chrdev(LP_MAJOR, "lp"); 968 for (offset = 0; offset < LP_NO; offset++) { 969 if (lp_table[offset].dev == NULL) 970 continue; 971 parport_unregister_device(lp_table[offset].dev); 972 device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); 973 } 974 class_destroy(lp_class); 975 } 976 977 __setup("lp=", lp_setup); 978 module_init(lp_init_module); 979 module_exit(lp_cleanup_module); 980 981 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 982 MODULE_LICENSE("GPL"); 983