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 #include <linux/jiffies.h> 132 133 #include <linux/parport.h> 134 #undef LP_STATS 135 #include <linux/lp.h> 136 137 #include <asm/irq.h> 138 #include <asm/uaccess.h> 139 #include <asm/system.h> 140 141 /* if you have more than 8 printers, remember to increase LP_NO */ 142 #define LP_NO 8 143 144 /* ROUND_UP macro from fs/select.c */ 145 #define ROUND_UP(x,y) (((x)+(y)-1)/(y)) 146 147 static struct lp_struct lp_table[LP_NO]; 148 149 static unsigned int lp_count = 0; 150 static struct class *lp_class; 151 152 #ifdef CONFIG_LP_CONSOLE 153 static struct parport *console_registered; // initially NULL 154 #endif /* CONFIG_LP_CONSOLE */ 155 156 #undef LP_DEBUG 157 158 /* Bits used to manage claiming the parport device */ 159 #define LP_PREEMPT_REQUEST 1 160 #define LP_PARPORT_CLAIMED 2 161 162 /* --- low-level port access ----------------------------------- */ 163 164 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 165 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 166 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 167 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 168 169 /* Claim the parport or block trying unless we've already claimed it */ 170 static void lp_claim_parport_or_block(struct lp_struct *this_lp) 171 { 172 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 173 parport_claim_or_block (this_lp->dev); 174 } 175 } 176 177 /* Claim the parport or block trying unless we've already claimed it */ 178 static void lp_release_parport(struct lp_struct *this_lp) 179 { 180 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 181 parport_release (this_lp->dev); 182 } 183 } 184 185 186 187 static int lp_preempt(void *handle) 188 { 189 struct lp_struct *this_lp = (struct lp_struct *)handle; 190 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 191 return (1); 192 } 193 194 195 /* 196 * Try to negotiate to a new mode; if unsuccessful negotiate to 197 * compatibility mode. Return the mode we ended up in. 198 */ 199 static int lp_negotiate(struct parport * port, int mode) 200 { 201 if (parport_negotiate (port, mode) != 0) { 202 mode = IEEE1284_MODE_COMPAT; 203 parport_negotiate (port, mode); 204 } 205 206 return (mode); 207 } 208 209 static int lp_reset(int minor) 210 { 211 int retval; 212 lp_claim_parport_or_block (&lp_table[minor]); 213 w_ctr(minor, LP_PSELECP); 214 udelay (LP_DELAY); 215 w_ctr(minor, LP_PSELECP | LP_PINITP); 216 retval = r_str(minor); 217 lp_release_parport (&lp_table[minor]); 218 return retval; 219 } 220 221 static void lp_error (int minor) 222 { 223 DEFINE_WAIT(wait); 224 int polling; 225 226 if (LP_F(minor) & LP_ABORT) 227 return; 228 229 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; 230 if (polling) lp_release_parport (&lp_table[minor]); 231 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 232 schedule_timeout(LP_TIMEOUT_POLLED); 233 finish_wait(&lp_table[minor].waitq, &wait); 234 if (polling) lp_claim_parport_or_block (&lp_table[minor]); 235 else parport_yield_blocking (lp_table[minor].dev); 236 } 237 238 static int lp_check_status(int minor) 239 { 240 int error = 0; 241 unsigned int last = lp_table[minor].last_error; 242 unsigned char status = r_str(minor); 243 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 244 /* No error. */ 245 last = 0; 246 else if ((status & LP_POUTPA)) { 247 if (last != LP_POUTPA) { 248 last = LP_POUTPA; 249 printk(KERN_INFO "lp%d out of paper\n", minor); 250 } 251 error = -ENOSPC; 252 } else if (!(status & LP_PSELECD)) { 253 if (last != LP_PSELECD) { 254 last = LP_PSELECD; 255 printk(KERN_INFO "lp%d off-line\n", minor); 256 } 257 error = -EIO; 258 } else if (!(status & LP_PERRORP)) { 259 if (last != LP_PERRORP) { 260 last = LP_PERRORP; 261 printk(KERN_INFO "lp%d on fire\n", minor); 262 } 263 error = -EIO; 264 } else { 265 last = 0; /* Come here if LP_CAREFUL is set and no 266 errors are reported. */ 267 } 268 269 lp_table[minor].last_error = last; 270 271 if (last != 0) 272 lp_error(minor); 273 274 return error; 275 } 276 277 static int lp_wait_ready(int minor, int nonblock) 278 { 279 int error = 0; 280 281 /* If we're not in compatibility mode, we're ready now! */ 282 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 283 return (0); 284 } 285 286 do { 287 error = lp_check_status (minor); 288 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 289 break; 290 if (signal_pending (current)) { 291 error = -EINTR; 292 break; 293 } 294 } while (error); 295 return error; 296 } 297 298 static ssize_t lp_write(struct file * file, const char __user * buf, 299 size_t count, loff_t *ppos) 300 { 301 unsigned int minor = iminor(file->f_dentry->d_inode); 302 struct parport *port = lp_table[minor].dev->port; 303 char *kbuf = lp_table[minor].lp_buffer; 304 ssize_t retv = 0; 305 ssize_t written; 306 size_t copy_size = count; 307 int nonblock = ((file->f_flags & O_NONBLOCK) || 308 (LP_F(minor) & LP_ABORT)); 309 310 #ifdef LP_STATS 311 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 312 lp_table[minor].runchars = 0; 313 314 lp_table[minor].lastcall = jiffies; 315 #endif 316 317 /* Need to copy the data from user-space. */ 318 if (copy_size > LP_BUFFER_SIZE) 319 copy_size = LP_BUFFER_SIZE; 320 321 if (down_interruptible (&lp_table[minor].port_mutex)) 322 return -EINTR; 323 324 if (copy_from_user (kbuf, buf, copy_size)) { 325 retv = -EFAULT; 326 goto out_unlock; 327 } 328 329 /* Claim Parport or sleep until it becomes available 330 */ 331 lp_claim_parport_or_block (&lp_table[minor]); 332 /* Go to the proper mode. */ 333 lp_table[minor].current_mode = lp_negotiate (port, 334 lp_table[minor].best_mode); 335 336 parport_set_timeout (lp_table[minor].dev, 337 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 338 : lp_table[minor].timeout)); 339 340 if ((retv = lp_wait_ready (minor, nonblock)) == 0) 341 do { 342 /* Write the data. */ 343 written = parport_write (port, kbuf, copy_size); 344 if (written > 0) { 345 copy_size -= written; 346 count -= written; 347 buf += written; 348 retv += written; 349 } 350 351 if (signal_pending (current)) { 352 if (retv == 0) 353 retv = -EINTR; 354 355 break; 356 } 357 358 if (copy_size > 0) { 359 /* incomplete write -> check error ! */ 360 int error; 361 362 parport_negotiate (lp_table[minor].dev->port, 363 IEEE1284_MODE_COMPAT); 364 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 365 366 error = lp_wait_ready (minor, nonblock); 367 368 if (error) { 369 if (retv == 0) 370 retv = error; 371 break; 372 } else if (nonblock) { 373 if (retv == 0) 374 retv = -EAGAIN; 375 break; 376 } 377 378 parport_yield_blocking (lp_table[minor].dev); 379 lp_table[minor].current_mode 380 = lp_negotiate (port, 381 lp_table[minor].best_mode); 382 383 } else if (need_resched()) 384 schedule (); 385 386 if (count) { 387 copy_size = count; 388 if (copy_size > LP_BUFFER_SIZE) 389 copy_size = LP_BUFFER_SIZE; 390 391 if (copy_from_user(kbuf, buf, copy_size)) { 392 if (retv == 0) 393 retv = -EFAULT; 394 break; 395 } 396 } 397 } while (count > 0); 398 399 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 400 &lp_table[minor].bits)) { 401 printk(KERN_INFO "lp%d releasing parport\n", minor); 402 parport_negotiate (lp_table[minor].dev->port, 403 IEEE1284_MODE_COMPAT); 404 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 405 lp_release_parport (&lp_table[minor]); 406 } 407 out_unlock: 408 up (&lp_table[minor].port_mutex); 409 410 return retv; 411 } 412 413 #ifdef CONFIG_PARPORT_1284 414 415 /* Status readback conforming to ieee1284 */ 416 static ssize_t lp_read(struct file * file, char __user * buf, 417 size_t count, loff_t *ppos) 418 { 419 DEFINE_WAIT(wait); 420 unsigned int minor=iminor(file->f_dentry->d_inode); 421 struct parport *port = lp_table[minor].dev->port; 422 ssize_t retval = 0; 423 char *kbuf = lp_table[minor].lp_buffer; 424 int nonblock = ((file->f_flags & O_NONBLOCK) || 425 (LP_F(minor) & LP_ABORT)); 426 427 if (count > LP_BUFFER_SIZE) 428 count = LP_BUFFER_SIZE; 429 430 if (down_interruptible (&lp_table[minor].port_mutex)) 431 return -EINTR; 432 433 lp_claim_parport_or_block (&lp_table[minor]); 434 435 parport_set_timeout (lp_table[minor].dev, 436 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 437 : lp_table[minor].timeout)); 438 439 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 440 if (parport_negotiate (lp_table[minor].dev->port, 441 IEEE1284_MODE_NIBBLE)) { 442 retval = -EIO; 443 goto out; 444 } 445 446 while (retval == 0) { 447 retval = parport_read (port, kbuf, count); 448 449 if (retval > 0) 450 break; 451 452 if (nonblock) { 453 retval = -EAGAIN; 454 break; 455 } 456 457 /* Wait for data. */ 458 459 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 460 parport_negotiate (lp_table[minor].dev->port, 461 IEEE1284_MODE_COMPAT); 462 lp_error (minor); 463 if (parport_negotiate (lp_table[minor].dev->port, 464 IEEE1284_MODE_NIBBLE)) { 465 retval = -EIO; 466 goto out; 467 } 468 } else { 469 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 470 schedule_timeout(LP_TIMEOUT_POLLED); 471 finish_wait(&lp_table[minor].waitq, &wait); 472 } 473 474 if (signal_pending (current)) { 475 retval = -ERESTARTSYS; 476 break; 477 } 478 479 cond_resched (); 480 } 481 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 482 out: 483 lp_release_parport (&lp_table[minor]); 484 485 if (retval > 0 && copy_to_user (buf, kbuf, retval)) 486 retval = -EFAULT; 487 488 up (&lp_table[minor].port_mutex); 489 490 return retval; 491 } 492 493 #endif /* IEEE 1284 support */ 494 495 static int lp_open(struct inode * inode, struct file * file) 496 { 497 unsigned int minor = iminor(inode); 498 499 if (minor >= LP_NO) 500 return -ENXIO; 501 if ((LP_F(minor) & LP_EXIST) == 0) 502 return -ENXIO; 503 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) 504 return -EBUSY; 505 506 /* If ABORTOPEN is set and the printer is offline or out of paper, 507 we may still want to open it to perform ioctl()s. Therefore we 508 have commandeered O_NONBLOCK, even though it is being used in 509 a non-standard manner. This is strictly a Linux hack, and 510 should most likely only ever be used by the tunelp application. */ 511 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 512 int status; 513 lp_claim_parport_or_block (&lp_table[minor]); 514 status = r_str(minor); 515 lp_release_parport (&lp_table[minor]); 516 if (status & LP_POUTPA) { 517 printk(KERN_INFO "lp%d out of paper\n", minor); 518 LP_F(minor) &= ~LP_BUSY; 519 return -ENOSPC; 520 } else if (!(status & LP_PSELECD)) { 521 printk(KERN_INFO "lp%d off-line\n", minor); 522 LP_F(minor) &= ~LP_BUSY; 523 return -EIO; 524 } else if (!(status & LP_PERRORP)) { 525 printk(KERN_ERR "lp%d printer error\n", minor); 526 LP_F(minor) &= ~LP_BUSY; 527 return -EIO; 528 } 529 } 530 lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 531 if (!lp_table[minor].lp_buffer) { 532 LP_F(minor) &= ~LP_BUSY; 533 return -ENOMEM; 534 } 535 /* Determine if the peripheral supports ECP mode */ 536 lp_claim_parport_or_block (&lp_table[minor]); 537 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 538 !parport_negotiate (lp_table[minor].dev->port, 539 IEEE1284_MODE_ECP)) { 540 printk (KERN_INFO "lp%d: ECP mode\n", minor); 541 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 542 } else { 543 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 544 } 545 /* Leave peripheral in compatibility mode */ 546 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 547 lp_release_parport (&lp_table[minor]); 548 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 549 return 0; 550 } 551 552 static int lp_release(struct inode * inode, struct file * file) 553 { 554 unsigned int minor = iminor(inode); 555 556 lp_claim_parport_or_block (&lp_table[minor]); 557 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 558 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 559 lp_release_parport (&lp_table[minor]); 560 kfree(lp_table[minor].lp_buffer); 561 lp_table[minor].lp_buffer = NULL; 562 LP_F(minor) &= ~LP_BUSY; 563 return 0; 564 } 565 566 static int lp_ioctl(struct inode *inode, struct file *file, 567 unsigned int cmd, unsigned long arg) 568 { 569 unsigned int minor = iminor(inode); 570 int status; 571 int retval = 0; 572 void __user *argp = (void __user *)arg; 573 574 #ifdef LP_DEBUG 575 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 576 #endif 577 if (minor >= LP_NO) 578 return -ENODEV; 579 if ((LP_F(minor) & LP_EXIST) == 0) 580 return -ENODEV; 581 switch ( cmd ) { 582 struct timeval par_timeout; 583 long to_jiffies; 584 585 case LPTIME: 586 LP_TIME(minor) = arg * HZ/100; 587 break; 588 case LPCHAR: 589 LP_CHAR(minor) = arg; 590 break; 591 case LPABORT: 592 if (arg) 593 LP_F(minor) |= LP_ABORT; 594 else 595 LP_F(minor) &= ~LP_ABORT; 596 break; 597 case LPABORTOPEN: 598 if (arg) 599 LP_F(minor) |= LP_ABORTOPEN; 600 else 601 LP_F(minor) &= ~LP_ABORTOPEN; 602 break; 603 case LPCAREFUL: 604 if (arg) 605 LP_F(minor) |= LP_CAREFUL; 606 else 607 LP_F(minor) &= ~LP_CAREFUL; 608 break; 609 case LPWAIT: 610 LP_WAIT(minor) = arg; 611 break; 612 case LPSETIRQ: 613 return -EINVAL; 614 break; 615 case LPGETIRQ: 616 if (copy_to_user(argp, &LP_IRQ(minor), 617 sizeof(int))) 618 return -EFAULT; 619 break; 620 case LPGETSTATUS: 621 lp_claim_parport_or_block (&lp_table[minor]); 622 status = r_str(minor); 623 lp_release_parport (&lp_table[minor]); 624 625 if (copy_to_user(argp, &status, sizeof(int))) 626 return -EFAULT; 627 break; 628 case LPRESET: 629 lp_reset(minor); 630 break; 631 #ifdef LP_STATS 632 case LPGETSTATS: 633 if (copy_to_user(argp, &LP_STAT(minor), 634 sizeof(struct lp_stats))) 635 return -EFAULT; 636 if (capable(CAP_SYS_ADMIN)) 637 memset(&LP_STAT(minor), 0, 638 sizeof(struct lp_stats)); 639 break; 640 #endif 641 case LPGETFLAGS: 642 status = LP_F(minor); 643 if (copy_to_user(argp, &status, sizeof(int))) 644 return -EFAULT; 645 break; 646 647 case LPSETTIMEOUT: 648 if (copy_from_user (&par_timeout, argp, 649 sizeof (struct timeval))) { 650 return -EFAULT; 651 } 652 /* Convert to jiffies, place in lp_table */ 653 if ((par_timeout.tv_sec < 0) || 654 (par_timeout.tv_usec < 0)) { 655 return -EINVAL; 656 } 657 to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ); 658 to_jiffies += par_timeout.tv_sec * (long) HZ; 659 if (to_jiffies <= 0) { 660 return -EINVAL; 661 } 662 lp_table[minor].timeout = to_jiffies; 663 break; 664 665 default: 666 retval = -EINVAL; 667 } 668 return retval; 669 } 670 671 static struct file_operations lp_fops = { 672 .owner = THIS_MODULE, 673 .write = lp_write, 674 .ioctl = lp_ioctl, 675 .open = lp_open, 676 .release = lp_release, 677 #ifdef CONFIG_PARPORT_1284 678 .read = lp_read, 679 #endif 680 }; 681 682 /* --- support for console on the line printer ----------------- */ 683 684 #ifdef CONFIG_LP_CONSOLE 685 686 #define CONSOLE_LP 0 687 688 /* If the printer is out of paper, we can either lose the messages or 689 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 690 * non-zero to get the latter behaviour. */ 691 #define CONSOLE_LP_STRICT 1 692 693 /* The console must be locked when we get here. */ 694 695 static void lp_console_write (struct console *co, const char *s, 696 unsigned count) 697 { 698 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 699 struct parport *port = dev->port; 700 ssize_t written; 701 702 if (parport_claim (dev)) 703 /* Nothing we can do. */ 704 return; 705 706 parport_set_timeout (dev, 0); 707 708 /* Go to compatibility mode. */ 709 parport_negotiate (port, IEEE1284_MODE_COMPAT); 710 711 do { 712 /* Write the data, converting LF->CRLF as we go. */ 713 ssize_t canwrite = count; 714 char *lf = memchr (s, '\n', count); 715 if (lf) 716 canwrite = lf - s; 717 718 if (canwrite > 0) { 719 written = parport_write (port, s, canwrite); 720 721 if (written <= 0) 722 continue; 723 724 s += written; 725 count -= written; 726 canwrite -= written; 727 } 728 729 if (lf && canwrite <= 0) { 730 const char *crlf = "\r\n"; 731 int i = 2; 732 733 /* Dodge the original '\n', and put '\r\n' instead. */ 734 s++; 735 count--; 736 do { 737 written = parport_write (port, crlf, i); 738 if (written > 0) 739 i -= written, crlf += written; 740 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 741 } 742 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 743 744 parport_release (dev); 745 } 746 747 static struct console lpcons = { 748 .name = "lp", 749 .write = lp_console_write, 750 .flags = CON_PRINTBUFFER, 751 }; 752 753 #endif /* console on line printer */ 754 755 /* --- initialisation code ------------------------------------- */ 756 757 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 758 static char *parport[LP_NO] = { NULL, }; 759 static int reset = 0; 760 761 module_param_array(parport, charp, NULL, 0); 762 module_param(reset, bool, 0); 763 764 #ifndef MODULE 765 static int __init lp_setup (char *str) 766 { 767 static int parport_ptr; // initially zero 768 int x; 769 770 if (get_option (&str, &x)) { 771 if (x == 0) { 772 /* disable driver on "lp=" or "lp=0" */ 773 parport_nr[0] = LP_PARPORT_OFF; 774 } else { 775 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 776 return 0; 777 } 778 } else if (!strncmp(str, "parport", 7)) { 779 int n = simple_strtoul(str+7, NULL, 10); 780 if (parport_ptr < LP_NO) 781 parport_nr[parport_ptr++] = n; 782 else 783 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 784 str); 785 } else if (!strcmp(str, "auto")) { 786 parport_nr[0] = LP_PARPORT_AUTO; 787 } else if (!strcmp(str, "none")) { 788 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 789 } else if (!strcmp(str, "reset")) { 790 reset = 1; 791 } 792 return 1; 793 } 794 #endif 795 796 static int lp_register(int nr, struct parport *port) 797 { 798 lp_table[nr].dev = parport_register_device(port, "lp", 799 lp_preempt, NULL, NULL, 0, 800 (void *) &lp_table[nr]); 801 if (lp_table[nr].dev == NULL) 802 return 1; 803 lp_table[nr].flags |= LP_EXIST; 804 805 if (reset) 806 lp_reset(nr); 807 808 class_device_create(lp_class, NULL, MKDEV(LP_MAJOR, nr), NULL, 809 "lp%d", nr); 810 devfs_mk_cdev(MKDEV(LP_MAJOR, nr), S_IFCHR | S_IRUGO | S_IWUGO, 811 "printers/%d", nr); 812 813 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 814 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 815 816 #ifdef CONFIG_LP_CONSOLE 817 if (!nr) { 818 if (port->modes & PARPORT_MODE_SAFEININT) { 819 register_console (&lpcons); 820 console_registered = port; 821 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 822 } else 823 printk (KERN_ERR "lp%d: cannot run console on %s\n", 824 CONSOLE_LP, port->name); 825 } 826 #endif 827 828 return 0; 829 } 830 831 static void lp_attach (struct parport *port) 832 { 833 unsigned int i; 834 835 switch (parport_nr[0]) 836 { 837 case LP_PARPORT_UNSPEC: 838 case LP_PARPORT_AUTO: 839 if (parport_nr[0] == LP_PARPORT_AUTO && 840 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 841 return; 842 if (lp_count == LP_NO) { 843 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 844 return; 845 } 846 if (!lp_register(lp_count, port)) 847 lp_count++; 848 break; 849 850 default: 851 for (i = 0; i < LP_NO; i++) { 852 if (port->number == parport_nr[i]) { 853 if (!lp_register(i, port)) 854 lp_count++; 855 break; 856 } 857 } 858 break; 859 } 860 } 861 862 static void lp_detach (struct parport *port) 863 { 864 /* Write this some day. */ 865 #ifdef CONFIG_LP_CONSOLE 866 if (console_registered == port) { 867 unregister_console (&lpcons); 868 console_registered = NULL; 869 } 870 #endif /* CONFIG_LP_CONSOLE */ 871 } 872 873 static struct parport_driver lp_driver = { 874 .name = "lp", 875 .attach = lp_attach, 876 .detach = lp_detach, 877 }; 878 879 static int __init lp_init (void) 880 { 881 int i, err = 0; 882 883 if (parport_nr[0] == LP_PARPORT_OFF) 884 return 0; 885 886 for (i = 0; i < LP_NO; i++) { 887 lp_table[i].dev = NULL; 888 lp_table[i].flags = 0; 889 lp_table[i].chars = LP_INIT_CHAR; 890 lp_table[i].time = LP_INIT_TIME; 891 lp_table[i].wait = LP_INIT_WAIT; 892 lp_table[i].lp_buffer = NULL; 893 #ifdef LP_STATS 894 lp_table[i].lastcall = 0; 895 lp_table[i].runchars = 0; 896 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); 897 #endif 898 lp_table[i].last_error = 0; 899 init_waitqueue_head (&lp_table[i].waitq); 900 init_waitqueue_head (&lp_table[i].dataq); 901 init_MUTEX (&lp_table[i].port_mutex); 902 lp_table[i].timeout = 10 * HZ; 903 } 904 905 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { 906 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 907 return -EIO; 908 } 909 910 devfs_mk_dir("printers"); 911 lp_class = class_create(THIS_MODULE, "printer"); 912 if (IS_ERR(lp_class)) { 913 err = PTR_ERR(lp_class); 914 goto out_devfs; 915 } 916 917 if (parport_register_driver (&lp_driver)) { 918 printk (KERN_ERR "lp: unable to register with parport\n"); 919 err = -EIO; 920 goto out_class; 921 } 922 923 if (!lp_count) { 924 printk (KERN_INFO "lp: driver loaded but no devices found\n"); 925 #ifndef CONFIG_PARPORT_1284 926 if (parport_nr[0] == LP_PARPORT_AUTO) 927 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 928 #endif 929 } 930 931 return 0; 932 933 out_class: 934 class_destroy(lp_class); 935 out_devfs: 936 devfs_remove("printers"); 937 unregister_chrdev(LP_MAJOR, "lp"); 938 return err; 939 } 940 941 static int __init lp_init_module (void) 942 { 943 if (parport[0]) { 944 /* The user gave some parameters. Let's see what they were. */ 945 if (!strncmp(parport[0], "auto", 4)) 946 parport_nr[0] = LP_PARPORT_AUTO; 947 else { 948 int n; 949 for (n = 0; n < LP_NO && parport[n]; n++) { 950 if (!strncmp(parport[n], "none", 4)) 951 parport_nr[n] = LP_PARPORT_NONE; 952 else { 953 char *ep; 954 unsigned long r = simple_strtoul(parport[n], &ep, 0); 955 if (ep != parport[n]) 956 parport_nr[n] = r; 957 else { 958 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 959 return -ENODEV; 960 } 961 } 962 } 963 } 964 } 965 966 return lp_init(); 967 } 968 969 static void lp_cleanup_module (void) 970 { 971 unsigned int offset; 972 973 parport_unregister_driver (&lp_driver); 974 975 #ifdef CONFIG_LP_CONSOLE 976 unregister_console (&lpcons); 977 #endif 978 979 unregister_chrdev(LP_MAJOR, "lp"); 980 for (offset = 0; offset < LP_NO; offset++) { 981 if (lp_table[offset].dev == NULL) 982 continue; 983 parport_unregister_device(lp_table[offset].dev); 984 devfs_remove("printers/%d", offset); 985 class_device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); 986 } 987 devfs_remove("printers"); 988 class_destroy(lp_class); 989 } 990 991 __setup("lp=", lp_setup); 992 module_init(lp_init_module); 993 module_exit(lp_cleanup_module); 994 995 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 996 MODULE_LICENSE("GPL"); 997