1 /* 2 * Generic parallel printer driver 3 * 4 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds 5 * Copyright (C) 1992,1993 by Michael K. Johnson 6 * - Thanks much to Gunter Windau for pointing out to me where the error 7 * checking ought to be. 8 * Copyright (C) 1993 by Nigel Gamble (added interrupt code) 9 * Copyright (C) 1994 by Alan Cox (Modularised it) 10 * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu 11 * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl 12 * "lp=" command line parameters added by Grant Guenther, grant@torque.net 13 * lp_read (Status readback) support added by Carsten Gross, 14 * carsten@sol.wohnheim.uni-ulm.de 15 * Support for parport by Philip Blundell <philb@gnu.org> 16 * Parport sharing hacking by Andrea Arcangeli 17 * Fixed kernel_(to/from)_user memory copy to check for errors 18 * by Riccardo Facchetti <fizban@tin.it> 19 * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au> 20 * Redesigned interrupt handling for handle printers with buggy handshake 21 * by Andrea Arcangeli, 11 May 1998 22 * Full efficient handling of printer with buggy irq handshake (now I have 23 * understood the meaning of the strange handshake). This is done sending new 24 * characters if the interrupt is just happened, even if the printer say to 25 * be still BUSY. This is needed at least with Epson Stylus Color. To enable 26 * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below... 27 * Fixed the irq on the rising edge of the strobe case. 28 * Obsoleted the CAREFUL flag since a printer that doesn' t work with 29 * CAREFUL will block a bit after in lp_check_status(). 30 * Andrea Arcangeli, 15 Oct 1998 31 * Obsoleted and removed all the lowlevel stuff implemented in the last 32 * month to use the IEEE1284 functions (that handle the _new_ compatibilty 33 * mode fine). 34 */ 35 36 /* This driver should, in theory, work with any parallel port that has an 37 * appropriate low-level driver; all I/O is done through the parport 38 * abstraction layer. 39 * 40 * If this driver is built into the kernel, you can configure it using the 41 * kernel command-line. For example: 42 * 43 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and 44 * bind lp2 to parport2) 45 * 46 * lp=auto (assign lp devices to all ports that 47 * have printers attached, as determined 48 * by the IEEE-1284 autoprobe) 49 * 50 * lp=reset (reset the printer during 51 * initialisation) 52 * 53 * lp=off (disable the printer driver entirely) 54 * 55 * If the driver is loaded as a module, similar functionality is available 56 * using module parameters. The equivalent of the above commands would be: 57 * 58 * # insmod lp.o parport=1,none,2 59 * 60 * # insmod lp.o parport=auto 61 * 62 * # insmod lp.o reset=1 63 */ 64 65 /* COMPATIBILITY WITH OLD KERNELS 66 * 67 * Under Linux 2.0 and previous versions, lp devices were bound to ports at 68 * particular I/O addresses, as follows: 69 * 70 * lp0 0x3bc 71 * lp1 0x378 72 * lp2 0x278 73 * 74 * The new driver, by default, binds lp devices to parport devices as it 75 * finds them. This means that if you only have one port, it will be bound 76 * to lp0 regardless of its I/O address. If you need the old behaviour, you 77 * can force it using the parameters described above. 78 */ 79 80 /* 81 * The new interrupt handling code take care of the buggy handshake 82 * of some HP and Epson printer: 83 * ___ 84 * ACK _______________ ___________ 85 * |__| 86 * ____ 87 * BUSY _________ _______ 88 * |____________| 89 * 90 * I discovered this using the printer scanner that you can find at: 91 * 92 * ftp://e-mind.com/pub/linux/pscan/ 93 * 94 * 11 May 98, Andrea Arcangeli 95 * 96 * My printer scanner run on an Epson Stylus Color show that such printer 97 * generates the irq on the _rising_ edge of the STROBE. Now lp handle 98 * this case fine too. 99 * 100 * 15 Oct 1998, Andrea Arcangeli 101 * 102 * The so called `buggy' handshake is really the well documented 103 * compatibility mode IEEE1284 handshake. They changed the well known 104 * Centronics handshake acking in the middle of busy expecting to not 105 * break drivers or legacy application, while they broken linux lp 106 * until I fixed it reverse engineering the protocol by hand some 107 * month ago... 108 * 109 * 14 Dec 1998, Andrea Arcangeli 110 * 111 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl) 112 */ 113 114 #include <linux/module.h> 115 #include <linux/init.h> 116 117 #include <linux/errno.h> 118 #include <linux/kernel.h> 119 #include <linux/major.h> 120 #include <linux/sched.h> 121 #include <linux/slab.h> 122 #include <linux/fcntl.h> 123 #include <linux/delay.h> 124 #include <linux/poll.h> 125 #include <linux/console.h> 126 #include <linux/device.h> 127 #include <linux/wait.h> 128 #include <linux/jiffies.h> 129 #include <linux/mutex.h> 130 #include <linux/compat.h> 131 132 #include <linux/parport.h> 133 #undef LP_STATS 134 #include <linux/lp.h> 135 136 #include <asm/irq.h> 137 #include <asm/uaccess.h> 138 #include <asm/system.h> 139 140 /* if you have more than 8 printers, remember to increase LP_NO */ 141 #define LP_NO 8 142 143 static DEFINE_MUTEX(lp_mutex); 144 static struct lp_struct lp_table[LP_NO]; 145 146 static unsigned int lp_count = 0; 147 static struct class *lp_class; 148 149 #ifdef CONFIG_LP_CONSOLE 150 static struct parport *console_registered; 151 #endif /* CONFIG_LP_CONSOLE */ 152 153 #undef LP_DEBUG 154 155 /* Bits used to manage claiming the parport device */ 156 #define LP_PREEMPT_REQUEST 1 157 #define LP_PARPORT_CLAIMED 2 158 159 /* --- low-level port access ----------------------------------- */ 160 161 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 162 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 163 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 164 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 165 166 /* Claim the parport or block trying unless we've already claimed it */ 167 static void lp_claim_parport_or_block(struct lp_struct *this_lp) 168 { 169 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 170 parport_claim_or_block (this_lp->dev); 171 } 172 } 173 174 /* Claim the parport or block trying unless we've already claimed it */ 175 static void lp_release_parport(struct lp_struct *this_lp) 176 { 177 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 178 parport_release (this_lp->dev); 179 } 180 } 181 182 183 184 static int lp_preempt(void *handle) 185 { 186 struct lp_struct *this_lp = (struct lp_struct *)handle; 187 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 188 return (1); 189 } 190 191 192 /* 193 * Try to negotiate to a new mode; if unsuccessful negotiate to 194 * compatibility mode. Return the mode we ended up in. 195 */ 196 static int lp_negotiate(struct parport * port, int mode) 197 { 198 if (parport_negotiate (port, mode) != 0) { 199 mode = IEEE1284_MODE_COMPAT; 200 parport_negotiate (port, mode); 201 } 202 203 return (mode); 204 } 205 206 static int lp_reset(int minor) 207 { 208 int retval; 209 lp_claim_parport_or_block (&lp_table[minor]); 210 w_ctr(minor, LP_PSELECP); 211 udelay (LP_DELAY); 212 w_ctr(minor, LP_PSELECP | LP_PINITP); 213 retval = r_str(minor); 214 lp_release_parport (&lp_table[minor]); 215 return retval; 216 } 217 218 static void lp_error (int minor) 219 { 220 DEFINE_WAIT(wait); 221 int polling; 222 223 if (LP_F(minor) & LP_ABORT) 224 return; 225 226 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; 227 if (polling) lp_release_parport (&lp_table[minor]); 228 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 229 schedule_timeout(LP_TIMEOUT_POLLED); 230 finish_wait(&lp_table[minor].waitq, &wait); 231 if (polling) lp_claim_parport_or_block (&lp_table[minor]); 232 else parport_yield_blocking (lp_table[minor].dev); 233 } 234 235 static int lp_check_status(int minor) 236 { 237 int error = 0; 238 unsigned int last = lp_table[minor].last_error; 239 unsigned char status = r_str(minor); 240 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 241 /* No error. */ 242 last = 0; 243 else if ((status & LP_POUTPA)) { 244 if (last != LP_POUTPA) { 245 last = LP_POUTPA; 246 printk(KERN_INFO "lp%d out of paper\n", minor); 247 } 248 error = -ENOSPC; 249 } else if (!(status & LP_PSELECD)) { 250 if (last != LP_PSELECD) { 251 last = LP_PSELECD; 252 printk(KERN_INFO "lp%d off-line\n", minor); 253 } 254 error = -EIO; 255 } else if (!(status & LP_PERRORP)) { 256 if (last != LP_PERRORP) { 257 last = LP_PERRORP; 258 printk(KERN_INFO "lp%d on fire\n", minor); 259 } 260 error = -EIO; 261 } else { 262 last = 0; /* Come here if LP_CAREFUL is set and no 263 errors are reported. */ 264 } 265 266 lp_table[minor].last_error = last; 267 268 if (last != 0) 269 lp_error(minor); 270 271 return error; 272 } 273 274 static int lp_wait_ready(int minor, int nonblock) 275 { 276 int error = 0; 277 278 /* If we're not in compatibility mode, we're ready now! */ 279 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 280 return (0); 281 } 282 283 do { 284 error = lp_check_status (minor); 285 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 286 break; 287 if (signal_pending (current)) { 288 error = -EINTR; 289 break; 290 } 291 } while (error); 292 return error; 293 } 294 295 static ssize_t lp_write(struct file * file, const char __user * buf, 296 size_t count, loff_t *ppos) 297 { 298 unsigned int minor = iminor(file->f_path.dentry->d_inode); 299 struct parport *port = lp_table[minor].dev->port; 300 char *kbuf = lp_table[minor].lp_buffer; 301 ssize_t retv = 0; 302 ssize_t written; 303 size_t copy_size = count; 304 int nonblock = ((file->f_flags & O_NONBLOCK) || 305 (LP_F(minor) & LP_ABORT)); 306 307 #ifdef LP_STATS 308 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 309 lp_table[minor].runchars = 0; 310 311 lp_table[minor].lastcall = jiffies; 312 #endif 313 314 /* Need to copy the data from user-space. */ 315 if (copy_size > LP_BUFFER_SIZE) 316 copy_size = LP_BUFFER_SIZE; 317 318 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 319 return -EINTR; 320 321 if (copy_from_user (kbuf, buf, copy_size)) { 322 retv = -EFAULT; 323 goto out_unlock; 324 } 325 326 /* Claim Parport or sleep until it becomes available 327 */ 328 lp_claim_parport_or_block (&lp_table[minor]); 329 /* Go to the proper mode. */ 330 lp_table[minor].current_mode = lp_negotiate (port, 331 lp_table[minor].best_mode); 332 333 parport_set_timeout (lp_table[minor].dev, 334 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 335 : lp_table[minor].timeout)); 336 337 if ((retv = lp_wait_ready (minor, nonblock)) == 0) 338 do { 339 /* Write the data. */ 340 written = parport_write (port, kbuf, copy_size); 341 if (written > 0) { 342 copy_size -= written; 343 count -= written; 344 buf += written; 345 retv += written; 346 } 347 348 if (signal_pending (current)) { 349 if (retv == 0) 350 retv = -EINTR; 351 352 break; 353 } 354 355 if (copy_size > 0) { 356 /* incomplete write -> check error ! */ 357 int error; 358 359 parport_negotiate (lp_table[minor].dev->port, 360 IEEE1284_MODE_COMPAT); 361 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 362 363 error = lp_wait_ready (minor, nonblock); 364 365 if (error) { 366 if (retv == 0) 367 retv = error; 368 break; 369 } else if (nonblock) { 370 if (retv == 0) 371 retv = -EAGAIN; 372 break; 373 } 374 375 parport_yield_blocking (lp_table[minor].dev); 376 lp_table[minor].current_mode 377 = lp_negotiate (port, 378 lp_table[minor].best_mode); 379 380 } else if (need_resched()) 381 schedule (); 382 383 if (count) { 384 copy_size = count; 385 if (copy_size > LP_BUFFER_SIZE) 386 copy_size = LP_BUFFER_SIZE; 387 388 if (copy_from_user(kbuf, buf, copy_size)) { 389 if (retv == 0) 390 retv = -EFAULT; 391 break; 392 } 393 } 394 } while (count > 0); 395 396 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 397 &lp_table[minor].bits)) { 398 printk(KERN_INFO "lp%d releasing parport\n", minor); 399 parport_negotiate (lp_table[minor].dev->port, 400 IEEE1284_MODE_COMPAT); 401 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 402 lp_release_parport (&lp_table[minor]); 403 } 404 out_unlock: 405 mutex_unlock(&lp_table[minor].port_mutex); 406 407 return retv; 408 } 409 410 #ifdef CONFIG_PARPORT_1284 411 412 /* Status readback conforming to ieee1284 */ 413 static ssize_t lp_read(struct file * file, char __user * buf, 414 size_t count, loff_t *ppos) 415 { 416 DEFINE_WAIT(wait); 417 unsigned int minor=iminor(file->f_path.dentry->d_inode); 418 struct parport *port = lp_table[minor].dev->port; 419 ssize_t retval = 0; 420 char *kbuf = lp_table[minor].lp_buffer; 421 int nonblock = ((file->f_flags & O_NONBLOCK) || 422 (LP_F(minor) & LP_ABORT)); 423 424 if (count > LP_BUFFER_SIZE) 425 count = LP_BUFFER_SIZE; 426 427 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 428 return -EINTR; 429 430 lp_claim_parport_or_block (&lp_table[minor]); 431 432 parport_set_timeout (lp_table[minor].dev, 433 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 434 : lp_table[minor].timeout)); 435 436 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 437 if (parport_negotiate (lp_table[minor].dev->port, 438 IEEE1284_MODE_NIBBLE)) { 439 retval = -EIO; 440 goto out; 441 } 442 443 while (retval == 0) { 444 retval = parport_read (port, kbuf, count); 445 446 if (retval > 0) 447 break; 448 449 if (nonblock) { 450 retval = -EAGAIN; 451 break; 452 } 453 454 /* Wait for data. */ 455 456 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 457 parport_negotiate (lp_table[minor].dev->port, 458 IEEE1284_MODE_COMPAT); 459 lp_error (minor); 460 if (parport_negotiate (lp_table[minor].dev->port, 461 IEEE1284_MODE_NIBBLE)) { 462 retval = -EIO; 463 goto out; 464 } 465 } else { 466 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 467 schedule_timeout(LP_TIMEOUT_POLLED); 468 finish_wait(&lp_table[minor].waitq, &wait); 469 } 470 471 if (signal_pending (current)) { 472 retval = -ERESTARTSYS; 473 break; 474 } 475 476 cond_resched (); 477 } 478 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 479 out: 480 lp_release_parport (&lp_table[minor]); 481 482 if (retval > 0 && copy_to_user (buf, kbuf, retval)) 483 retval = -EFAULT; 484 485 mutex_unlock(&lp_table[minor].port_mutex); 486 487 return retval; 488 } 489 490 #endif /* IEEE 1284 support */ 491 492 static int lp_open(struct inode * inode, struct file * file) 493 { 494 unsigned int minor = iminor(inode); 495 int ret = 0; 496 497 mutex_lock(&lp_mutex); 498 if (minor >= LP_NO) { 499 ret = -ENXIO; 500 goto out; 501 } 502 if ((LP_F(minor) & LP_EXIST) == 0) { 503 ret = -ENXIO; 504 goto out; 505 } 506 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) { 507 ret = -EBUSY; 508 goto out; 509 } 510 /* If ABORTOPEN is set and the printer is offline or out of paper, 511 we may still want to open it to perform ioctl()s. Therefore we 512 have commandeered O_NONBLOCK, even though it is being used in 513 a non-standard manner. This is strictly a Linux hack, and 514 should most likely only ever be used by the tunelp application. */ 515 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 516 int status; 517 lp_claim_parport_or_block (&lp_table[minor]); 518 status = r_str(minor); 519 lp_release_parport (&lp_table[minor]); 520 if (status & LP_POUTPA) { 521 printk(KERN_INFO "lp%d out of paper\n", minor); 522 LP_F(minor) &= ~LP_BUSY; 523 ret = -ENOSPC; 524 goto out; 525 } else if (!(status & LP_PSELECD)) { 526 printk(KERN_INFO "lp%d off-line\n", minor); 527 LP_F(minor) &= ~LP_BUSY; 528 ret = -EIO; 529 goto out; 530 } else if (!(status & LP_PERRORP)) { 531 printk(KERN_ERR "lp%d printer error\n", minor); 532 LP_F(minor) &= ~LP_BUSY; 533 ret = -EIO; 534 goto out; 535 } 536 } 537 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 538 if (!lp_table[minor].lp_buffer) { 539 LP_F(minor) &= ~LP_BUSY; 540 ret = -ENOMEM; 541 goto out; 542 } 543 /* Determine if the peripheral supports ECP mode */ 544 lp_claim_parport_or_block (&lp_table[minor]); 545 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 546 !parport_negotiate (lp_table[minor].dev->port, 547 IEEE1284_MODE_ECP)) { 548 printk (KERN_INFO "lp%d: ECP mode\n", minor); 549 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 550 } else { 551 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 552 } 553 /* Leave peripheral in compatibility mode */ 554 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 555 lp_release_parport (&lp_table[minor]); 556 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 557 out: 558 mutex_unlock(&lp_mutex); 559 return ret; 560 } 561 562 static int lp_release(struct inode * inode, struct file * file) 563 { 564 unsigned int minor = iminor(inode); 565 566 lp_claim_parport_or_block (&lp_table[minor]); 567 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 568 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 569 lp_release_parport (&lp_table[minor]); 570 kfree(lp_table[minor].lp_buffer); 571 lp_table[minor].lp_buffer = NULL; 572 LP_F(minor) &= ~LP_BUSY; 573 return 0; 574 } 575 576 static int lp_do_ioctl(unsigned int minor, unsigned int cmd, 577 unsigned long arg, void __user *argp) 578 { 579 int status; 580 int retval = 0; 581 582 #ifdef LP_DEBUG 583 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 584 #endif 585 if (minor >= LP_NO) 586 return -ENODEV; 587 if ((LP_F(minor) & LP_EXIST) == 0) 588 return -ENODEV; 589 switch ( cmd ) { 590 case LPTIME: 591 LP_TIME(minor) = arg * HZ/100; 592 break; 593 case LPCHAR: 594 LP_CHAR(minor) = arg; 595 break; 596 case LPABORT: 597 if (arg) 598 LP_F(minor) |= LP_ABORT; 599 else 600 LP_F(minor) &= ~LP_ABORT; 601 break; 602 case LPABORTOPEN: 603 if (arg) 604 LP_F(minor) |= LP_ABORTOPEN; 605 else 606 LP_F(minor) &= ~LP_ABORTOPEN; 607 break; 608 case LPCAREFUL: 609 if (arg) 610 LP_F(minor) |= LP_CAREFUL; 611 else 612 LP_F(minor) &= ~LP_CAREFUL; 613 break; 614 case LPWAIT: 615 LP_WAIT(minor) = arg; 616 break; 617 case LPSETIRQ: 618 return -EINVAL; 619 break; 620 case LPGETIRQ: 621 if (copy_to_user(argp, &LP_IRQ(minor), 622 sizeof(int))) 623 return -EFAULT; 624 break; 625 case LPGETSTATUS: 626 lp_claim_parport_or_block (&lp_table[minor]); 627 status = r_str(minor); 628 lp_release_parport (&lp_table[minor]); 629 630 if (copy_to_user(argp, &status, sizeof(int))) 631 return -EFAULT; 632 break; 633 case LPRESET: 634 lp_reset(minor); 635 break; 636 #ifdef LP_STATS 637 case LPGETSTATS: 638 if (copy_to_user(argp, &LP_STAT(minor), 639 sizeof(struct lp_stats))) 640 return -EFAULT; 641 if (capable(CAP_SYS_ADMIN)) 642 memset(&LP_STAT(minor), 0, 643 sizeof(struct lp_stats)); 644 break; 645 #endif 646 case LPGETFLAGS: 647 status = LP_F(minor); 648 if (copy_to_user(argp, &status, sizeof(int))) 649 return -EFAULT; 650 break; 651 652 default: 653 retval = -EINVAL; 654 } 655 return retval; 656 } 657 658 static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout) 659 { 660 long to_jiffies; 661 662 /* Convert to jiffies, place in lp_table */ 663 if ((par_timeout->tv_sec < 0) || 664 (par_timeout->tv_usec < 0)) { 665 return -EINVAL; 666 } 667 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ); 668 to_jiffies += par_timeout->tv_sec * (long) HZ; 669 if (to_jiffies <= 0) { 670 return -EINVAL; 671 } 672 lp_table[minor].timeout = to_jiffies; 673 return 0; 674 } 675 676 static long lp_ioctl(struct file *file, unsigned int cmd, 677 unsigned long arg) 678 { 679 unsigned int minor; 680 struct timeval par_timeout; 681 int ret; 682 683 minor = iminor(file->f_path.dentry->d_inode); 684 mutex_lock(&lp_mutex); 685 switch (cmd) { 686 case LPSETTIMEOUT: 687 if (copy_from_user(&par_timeout, (void __user *)arg, 688 sizeof (struct timeval))) { 689 ret = -EFAULT; 690 break; 691 } 692 ret = lp_set_timeout(minor, &par_timeout); 693 break; 694 default: 695 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 696 break; 697 } 698 mutex_unlock(&lp_mutex); 699 700 return ret; 701 } 702 703 #ifdef CONFIG_COMPAT 704 static long lp_compat_ioctl(struct file *file, unsigned int cmd, 705 unsigned long arg) 706 { 707 unsigned int minor; 708 struct timeval par_timeout; 709 struct compat_timeval __user *tc; 710 int ret; 711 712 minor = iminor(file->f_path.dentry->d_inode); 713 mutex_lock(&lp_mutex); 714 switch (cmd) { 715 case LPSETTIMEOUT: 716 tc = compat_ptr(arg); 717 if (get_user(par_timeout.tv_sec, &tc->tv_sec) || 718 get_user(par_timeout.tv_usec, &tc->tv_usec)) { 719 ret = -EFAULT; 720 break; 721 } 722 ret = lp_set_timeout(minor, &par_timeout); 723 break; 724 #ifdef LP_STATS 725 case LPGETSTATS: 726 /* FIXME: add an implementation if you set LP_STATS */ 727 ret = -EINVAL; 728 break; 729 #endif 730 default: 731 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 732 break; 733 } 734 mutex_unlock(&lp_mutex); 735 736 return ret; 737 } 738 #endif 739 740 static const struct file_operations lp_fops = { 741 .owner = THIS_MODULE, 742 .write = lp_write, 743 .unlocked_ioctl = lp_ioctl, 744 #ifdef CONFIG_COMPAT 745 .compat_ioctl = lp_compat_ioctl, 746 #endif 747 .open = lp_open, 748 .release = lp_release, 749 #ifdef CONFIG_PARPORT_1284 750 .read = lp_read, 751 #endif 752 .llseek = noop_llseek, 753 }; 754 755 /* --- support for console on the line printer ----------------- */ 756 757 #ifdef CONFIG_LP_CONSOLE 758 759 #define CONSOLE_LP 0 760 761 /* If the printer is out of paper, we can either lose the messages or 762 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 763 * non-zero to get the latter behaviour. */ 764 #define CONSOLE_LP_STRICT 1 765 766 /* The console must be locked when we get here. */ 767 768 static void lp_console_write (struct console *co, const char *s, 769 unsigned count) 770 { 771 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 772 struct parport *port = dev->port; 773 ssize_t written; 774 775 if (parport_claim (dev)) 776 /* Nothing we can do. */ 777 return; 778 779 parport_set_timeout (dev, 0); 780 781 /* Go to compatibility mode. */ 782 parport_negotiate (port, IEEE1284_MODE_COMPAT); 783 784 do { 785 /* Write the data, converting LF->CRLF as we go. */ 786 ssize_t canwrite = count; 787 char *lf = memchr (s, '\n', count); 788 if (lf) 789 canwrite = lf - s; 790 791 if (canwrite > 0) { 792 written = parport_write (port, s, canwrite); 793 794 if (written <= 0) 795 continue; 796 797 s += written; 798 count -= written; 799 canwrite -= written; 800 } 801 802 if (lf && canwrite <= 0) { 803 const char *crlf = "\r\n"; 804 int i = 2; 805 806 /* Dodge the original '\n', and put '\r\n' instead. */ 807 s++; 808 count--; 809 do { 810 written = parport_write (port, crlf, i); 811 if (written > 0) 812 i -= written, crlf += written; 813 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 814 } 815 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 816 817 parport_release (dev); 818 } 819 820 static struct console lpcons = { 821 .name = "lp", 822 .write = lp_console_write, 823 .flags = CON_PRINTBUFFER, 824 }; 825 826 #endif /* console on line printer */ 827 828 /* --- initialisation code ------------------------------------- */ 829 830 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 831 static char *parport[LP_NO]; 832 static int reset; 833 834 module_param_array(parport, charp, NULL, 0); 835 module_param(reset, bool, 0); 836 837 #ifndef MODULE 838 static int __init lp_setup (char *str) 839 { 840 static int parport_ptr; 841 int x; 842 843 if (get_option(&str, &x)) { 844 if (x == 0) { 845 /* disable driver on "lp=" or "lp=0" */ 846 parport_nr[0] = LP_PARPORT_OFF; 847 } else { 848 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 849 return 0; 850 } 851 } else if (!strncmp(str, "parport", 7)) { 852 int n = simple_strtoul(str+7, NULL, 10); 853 if (parport_ptr < LP_NO) 854 parport_nr[parport_ptr++] = n; 855 else 856 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 857 str); 858 } else if (!strcmp(str, "auto")) { 859 parport_nr[0] = LP_PARPORT_AUTO; 860 } else if (!strcmp(str, "none")) { 861 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 862 } else if (!strcmp(str, "reset")) { 863 reset = 1; 864 } 865 return 1; 866 } 867 #endif 868 869 static int lp_register(int nr, struct parport *port) 870 { 871 lp_table[nr].dev = parport_register_device(port, "lp", 872 lp_preempt, NULL, NULL, 0, 873 (void *) &lp_table[nr]); 874 if (lp_table[nr].dev == NULL) 875 return 1; 876 lp_table[nr].flags |= LP_EXIST; 877 878 if (reset) 879 lp_reset(nr); 880 881 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 882 "lp%d", nr); 883 884 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 885 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 886 887 #ifdef CONFIG_LP_CONSOLE 888 if (!nr) { 889 if (port->modes & PARPORT_MODE_SAFEININT) { 890 register_console(&lpcons); 891 console_registered = port; 892 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 893 } else 894 printk (KERN_ERR "lp%d: cannot run console on %s\n", 895 CONSOLE_LP, port->name); 896 } 897 #endif 898 899 return 0; 900 } 901 902 static void lp_attach (struct parport *port) 903 { 904 unsigned int i; 905 906 switch (parport_nr[0]) { 907 case LP_PARPORT_UNSPEC: 908 case LP_PARPORT_AUTO: 909 if (parport_nr[0] == LP_PARPORT_AUTO && 910 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 911 return; 912 if (lp_count == LP_NO) { 913 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 914 return; 915 } 916 if (!lp_register(lp_count, port)) 917 lp_count++; 918 break; 919 920 default: 921 for (i = 0; i < LP_NO; i++) { 922 if (port->number == parport_nr[i]) { 923 if (!lp_register(i, port)) 924 lp_count++; 925 break; 926 } 927 } 928 break; 929 } 930 } 931 932 static void lp_detach (struct parport *port) 933 { 934 /* Write this some day. */ 935 #ifdef CONFIG_LP_CONSOLE 936 if (console_registered == port) { 937 unregister_console(&lpcons); 938 console_registered = NULL; 939 } 940 #endif /* CONFIG_LP_CONSOLE */ 941 } 942 943 static struct parport_driver lp_driver = { 944 .name = "lp", 945 .attach = lp_attach, 946 .detach = lp_detach, 947 }; 948 949 static int __init lp_init (void) 950 { 951 int i, err = 0; 952 953 if (parport_nr[0] == LP_PARPORT_OFF) 954 return 0; 955 956 for (i = 0; i < LP_NO; i++) { 957 lp_table[i].dev = NULL; 958 lp_table[i].flags = 0; 959 lp_table[i].chars = LP_INIT_CHAR; 960 lp_table[i].time = LP_INIT_TIME; 961 lp_table[i].wait = LP_INIT_WAIT; 962 lp_table[i].lp_buffer = NULL; 963 #ifdef LP_STATS 964 lp_table[i].lastcall = 0; 965 lp_table[i].runchars = 0; 966 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); 967 #endif 968 lp_table[i].last_error = 0; 969 init_waitqueue_head (&lp_table[i].waitq); 970 init_waitqueue_head (&lp_table[i].dataq); 971 mutex_init(&lp_table[i].port_mutex); 972 lp_table[i].timeout = 10 * HZ; 973 } 974 975 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { 976 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 977 return -EIO; 978 } 979 980 lp_class = class_create(THIS_MODULE, "printer"); 981 if (IS_ERR(lp_class)) { 982 err = PTR_ERR(lp_class); 983 goto out_reg; 984 } 985 986 if (parport_register_driver (&lp_driver)) { 987 printk (KERN_ERR "lp: unable to register with parport\n"); 988 err = -EIO; 989 goto out_class; 990 } 991 992 if (!lp_count) { 993 printk (KERN_INFO "lp: driver loaded but no devices found\n"); 994 #ifndef CONFIG_PARPORT_1284 995 if (parport_nr[0] == LP_PARPORT_AUTO) 996 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 997 #endif 998 } 999 1000 return 0; 1001 1002 out_class: 1003 class_destroy(lp_class); 1004 out_reg: 1005 unregister_chrdev(LP_MAJOR, "lp"); 1006 return err; 1007 } 1008 1009 static int __init lp_init_module (void) 1010 { 1011 if (parport[0]) { 1012 /* The user gave some parameters. Let's see what they were. */ 1013 if (!strncmp(parport[0], "auto", 4)) 1014 parport_nr[0] = LP_PARPORT_AUTO; 1015 else { 1016 int n; 1017 for (n = 0; n < LP_NO && parport[n]; n++) { 1018 if (!strncmp(parport[n], "none", 4)) 1019 parport_nr[n] = LP_PARPORT_NONE; 1020 else { 1021 char *ep; 1022 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1023 if (ep != parport[n]) 1024 parport_nr[n] = r; 1025 else { 1026 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1027 return -ENODEV; 1028 } 1029 } 1030 } 1031 } 1032 } 1033 1034 return lp_init(); 1035 } 1036 1037 static void lp_cleanup_module (void) 1038 { 1039 unsigned int offset; 1040 1041 parport_unregister_driver (&lp_driver); 1042 1043 #ifdef CONFIG_LP_CONSOLE 1044 unregister_console (&lpcons); 1045 #endif 1046 1047 unregister_chrdev(LP_MAJOR, "lp"); 1048 for (offset = 0; offset < LP_NO; offset++) { 1049 if (lp_table[offset].dev == NULL) 1050 continue; 1051 parport_unregister_device(lp_table[offset].dev); 1052 device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); 1053 } 1054 class_destroy(lp_class); 1055 } 1056 1057 __setup("lp=", lp_setup); 1058 module_init(lp_init_module); 1059 module_exit(lp_cleanup_module); 1060 1061 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1062 MODULE_LICENSE("GPL"); 1063