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> 138 139 /* if you have more than 8 printers, remember to increase LP_NO */ 140 #define LP_NO 8 141 142 static DEFINE_MUTEX(lp_mutex); 143 static struct lp_struct lp_table[LP_NO]; 144 145 static unsigned int lp_count = 0; 146 static struct class *lp_class; 147 148 #ifdef CONFIG_LP_CONSOLE 149 static struct parport *console_registered; 150 #endif /* CONFIG_LP_CONSOLE */ 151 152 #undef LP_DEBUG 153 154 /* Bits used to manage claiming the parport device */ 155 #define LP_PREEMPT_REQUEST 1 156 #define LP_PARPORT_CLAIMED 2 157 158 /* --- low-level port access ----------------------------------- */ 159 160 #define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 161 #define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 162 #define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 163 #define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 164 165 /* Claim the parport or block trying unless we've already claimed it */ 166 static void lp_claim_parport_or_block(struct lp_struct *this_lp) 167 { 168 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 169 parport_claim_or_block (this_lp->dev); 170 } 171 } 172 173 /* Claim the parport or block trying unless we've already claimed it */ 174 static void lp_release_parport(struct lp_struct *this_lp) 175 { 176 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 177 parport_release (this_lp->dev); 178 } 179 } 180 181 182 183 static int lp_preempt(void *handle) 184 { 185 struct lp_struct *this_lp = (struct lp_struct *)handle; 186 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 187 return (1); 188 } 189 190 191 /* 192 * Try to negotiate to a new mode; if unsuccessful negotiate to 193 * compatibility mode. Return the mode we ended up in. 194 */ 195 static int lp_negotiate(struct parport * port, int mode) 196 { 197 if (parport_negotiate (port, mode) != 0) { 198 mode = IEEE1284_MODE_COMPAT; 199 parport_negotiate (port, mode); 200 } 201 202 return (mode); 203 } 204 205 static int lp_reset(int minor) 206 { 207 int retval; 208 lp_claim_parport_or_block (&lp_table[minor]); 209 w_ctr(minor, LP_PSELECP); 210 udelay (LP_DELAY); 211 w_ctr(minor, LP_PSELECP | LP_PINITP); 212 retval = r_str(minor); 213 lp_release_parport (&lp_table[minor]); 214 return retval; 215 } 216 217 static void lp_error (int minor) 218 { 219 DEFINE_WAIT(wait); 220 int polling; 221 222 if (LP_F(minor) & LP_ABORT) 223 return; 224 225 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; 226 if (polling) lp_release_parport (&lp_table[minor]); 227 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 228 schedule_timeout(LP_TIMEOUT_POLLED); 229 finish_wait(&lp_table[minor].waitq, &wait); 230 if (polling) lp_claim_parport_or_block (&lp_table[minor]); 231 else parport_yield_blocking (lp_table[minor].dev); 232 } 233 234 static int lp_check_status(int minor) 235 { 236 int error = 0; 237 unsigned int last = lp_table[minor].last_error; 238 unsigned char status = r_str(minor); 239 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 240 /* No error. */ 241 last = 0; 242 else if ((status & LP_POUTPA)) { 243 if (last != LP_POUTPA) { 244 last = LP_POUTPA; 245 printk(KERN_INFO "lp%d out of paper\n", minor); 246 } 247 error = -ENOSPC; 248 } else if (!(status & LP_PSELECD)) { 249 if (last != LP_PSELECD) { 250 last = LP_PSELECD; 251 printk(KERN_INFO "lp%d off-line\n", minor); 252 } 253 error = -EIO; 254 } else if (!(status & LP_PERRORP)) { 255 if (last != LP_PERRORP) { 256 last = LP_PERRORP; 257 printk(KERN_INFO "lp%d on fire\n", minor); 258 } 259 error = -EIO; 260 } else { 261 last = 0; /* Come here if LP_CAREFUL is set and no 262 errors are reported. */ 263 } 264 265 lp_table[minor].last_error = last; 266 267 if (last != 0) 268 lp_error(minor); 269 270 return error; 271 } 272 273 static int lp_wait_ready(int minor, int nonblock) 274 { 275 int error = 0; 276 277 /* If we're not in compatibility mode, we're ready now! */ 278 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 279 return (0); 280 } 281 282 do { 283 error = lp_check_status (minor); 284 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 285 break; 286 if (signal_pending (current)) { 287 error = -EINTR; 288 break; 289 } 290 } while (error); 291 return error; 292 } 293 294 static ssize_t lp_write(struct file * file, const char __user * buf, 295 size_t count, loff_t *ppos) 296 { 297 unsigned int minor = iminor(file_inode(file)); 298 struct parport *port = lp_table[minor].dev->port; 299 char *kbuf = lp_table[minor].lp_buffer; 300 ssize_t retv = 0; 301 ssize_t written; 302 size_t copy_size = count; 303 int nonblock = ((file->f_flags & O_NONBLOCK) || 304 (LP_F(minor) & LP_ABORT)); 305 306 #ifdef LP_STATS 307 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 308 lp_table[minor].runchars = 0; 309 310 lp_table[minor].lastcall = jiffies; 311 #endif 312 313 /* Need to copy the data from user-space. */ 314 if (copy_size > LP_BUFFER_SIZE) 315 copy_size = LP_BUFFER_SIZE; 316 317 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 318 return -EINTR; 319 320 if (copy_from_user (kbuf, buf, copy_size)) { 321 retv = -EFAULT; 322 goto out_unlock; 323 } 324 325 /* Claim Parport or sleep until it becomes available 326 */ 327 lp_claim_parport_or_block (&lp_table[minor]); 328 /* Go to the proper mode. */ 329 lp_table[minor].current_mode = lp_negotiate (port, 330 lp_table[minor].best_mode); 331 332 parport_set_timeout (lp_table[minor].dev, 333 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 334 : lp_table[minor].timeout)); 335 336 if ((retv = lp_wait_ready (minor, nonblock)) == 0) 337 do { 338 /* Write the data. */ 339 written = parport_write (port, kbuf, copy_size); 340 if (written > 0) { 341 copy_size -= written; 342 count -= written; 343 buf += written; 344 retv += written; 345 } 346 347 if (signal_pending (current)) { 348 if (retv == 0) 349 retv = -EINTR; 350 351 break; 352 } 353 354 if (copy_size > 0) { 355 /* incomplete write -> check error ! */ 356 int error; 357 358 parport_negotiate (lp_table[minor].dev->port, 359 IEEE1284_MODE_COMPAT); 360 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 361 362 error = lp_wait_ready (minor, nonblock); 363 364 if (error) { 365 if (retv == 0) 366 retv = error; 367 break; 368 } else if (nonblock) { 369 if (retv == 0) 370 retv = -EAGAIN; 371 break; 372 } 373 374 parport_yield_blocking (lp_table[minor].dev); 375 lp_table[minor].current_mode 376 = lp_negotiate (port, 377 lp_table[minor].best_mode); 378 379 } else if (need_resched()) 380 schedule (); 381 382 if (count) { 383 copy_size = count; 384 if (copy_size > LP_BUFFER_SIZE) 385 copy_size = LP_BUFFER_SIZE; 386 387 if (copy_from_user(kbuf, buf, copy_size)) { 388 if (retv == 0) 389 retv = -EFAULT; 390 break; 391 } 392 } 393 } while (count > 0); 394 395 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 396 &lp_table[minor].bits)) { 397 printk(KERN_INFO "lp%d releasing parport\n", minor); 398 parport_negotiate (lp_table[minor].dev->port, 399 IEEE1284_MODE_COMPAT); 400 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 401 lp_release_parport (&lp_table[minor]); 402 } 403 out_unlock: 404 mutex_unlock(&lp_table[minor].port_mutex); 405 406 return retv; 407 } 408 409 #ifdef CONFIG_PARPORT_1284 410 411 /* Status readback conforming to ieee1284 */ 412 static ssize_t lp_read(struct file * file, char __user * buf, 413 size_t count, loff_t *ppos) 414 { 415 DEFINE_WAIT(wait); 416 unsigned int minor=iminor(file_inode(file)); 417 struct parport *port = lp_table[minor].dev->port; 418 ssize_t retval = 0; 419 char *kbuf = lp_table[minor].lp_buffer; 420 int nonblock = ((file->f_flags & O_NONBLOCK) || 421 (LP_F(minor) & LP_ABORT)); 422 423 if (count > LP_BUFFER_SIZE) 424 count = LP_BUFFER_SIZE; 425 426 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 427 return -EINTR; 428 429 lp_claim_parport_or_block (&lp_table[minor]); 430 431 parport_set_timeout (lp_table[minor].dev, 432 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 433 : lp_table[minor].timeout)); 434 435 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 436 if (parport_negotiate (lp_table[minor].dev->port, 437 IEEE1284_MODE_NIBBLE)) { 438 retval = -EIO; 439 goto out; 440 } 441 442 while (retval == 0) { 443 retval = parport_read (port, kbuf, count); 444 445 if (retval > 0) 446 break; 447 448 if (nonblock) { 449 retval = -EAGAIN; 450 break; 451 } 452 453 /* Wait for data. */ 454 455 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 456 parport_negotiate (lp_table[minor].dev->port, 457 IEEE1284_MODE_COMPAT); 458 lp_error (minor); 459 if (parport_negotiate (lp_table[minor].dev->port, 460 IEEE1284_MODE_NIBBLE)) { 461 retval = -EIO; 462 goto out; 463 } 464 } else { 465 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 466 schedule_timeout(LP_TIMEOUT_POLLED); 467 finish_wait(&lp_table[minor].waitq, &wait); 468 } 469 470 if (signal_pending (current)) { 471 retval = -ERESTARTSYS; 472 break; 473 } 474 475 cond_resched (); 476 } 477 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 478 out: 479 lp_release_parport (&lp_table[minor]); 480 481 if (retval > 0 && copy_to_user (buf, kbuf, retval)) 482 retval = -EFAULT; 483 484 mutex_unlock(&lp_table[minor].port_mutex); 485 486 return retval; 487 } 488 489 #endif /* IEEE 1284 support */ 490 491 static int lp_open(struct inode * inode, struct file * file) 492 { 493 unsigned int minor = iminor(inode); 494 int ret = 0; 495 496 mutex_lock(&lp_mutex); 497 if (minor >= LP_NO) { 498 ret = -ENXIO; 499 goto out; 500 } 501 if ((LP_F(minor) & LP_EXIST) == 0) { 502 ret = -ENXIO; 503 goto out; 504 } 505 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) { 506 ret = -EBUSY; 507 goto out; 508 } 509 /* If ABORTOPEN is set and the printer is offline or out of paper, 510 we may still want to open it to perform ioctl()s. Therefore we 511 have commandeered O_NONBLOCK, even though it is being used in 512 a non-standard manner. This is strictly a Linux hack, and 513 should most likely only ever be used by the tunelp application. */ 514 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 515 int status; 516 lp_claim_parport_or_block (&lp_table[minor]); 517 status = r_str(minor); 518 lp_release_parport (&lp_table[minor]); 519 if (status & LP_POUTPA) { 520 printk(KERN_INFO "lp%d out of paper\n", minor); 521 LP_F(minor) &= ~LP_BUSY; 522 ret = -ENOSPC; 523 goto out; 524 } else if (!(status & LP_PSELECD)) { 525 printk(KERN_INFO "lp%d off-line\n", minor); 526 LP_F(minor) &= ~LP_BUSY; 527 ret = -EIO; 528 goto out; 529 } else if (!(status & LP_PERRORP)) { 530 printk(KERN_ERR "lp%d printer error\n", minor); 531 LP_F(minor) &= ~LP_BUSY; 532 ret = -EIO; 533 goto out; 534 } 535 } 536 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 537 if (!lp_table[minor].lp_buffer) { 538 LP_F(minor) &= ~LP_BUSY; 539 ret = -ENOMEM; 540 goto out; 541 } 542 /* Determine if the peripheral supports ECP mode */ 543 lp_claim_parport_or_block (&lp_table[minor]); 544 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 545 !parport_negotiate (lp_table[minor].dev->port, 546 IEEE1284_MODE_ECP)) { 547 printk (KERN_INFO "lp%d: ECP mode\n", minor); 548 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 549 } else { 550 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 551 } 552 /* Leave peripheral in compatibility mode */ 553 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 554 lp_release_parport (&lp_table[minor]); 555 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 556 out: 557 mutex_unlock(&lp_mutex); 558 return ret; 559 } 560 561 static int lp_release(struct inode * inode, struct file * file) 562 { 563 unsigned int minor = iminor(inode); 564 565 lp_claim_parport_or_block (&lp_table[minor]); 566 parport_negotiate (lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 567 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 568 lp_release_parport (&lp_table[minor]); 569 kfree(lp_table[minor].lp_buffer); 570 lp_table[minor].lp_buffer = NULL; 571 LP_F(minor) &= ~LP_BUSY; 572 return 0; 573 } 574 575 static int lp_do_ioctl(unsigned int minor, unsigned int cmd, 576 unsigned long arg, void __user *argp) 577 { 578 int status; 579 int retval = 0; 580 581 #ifdef LP_DEBUG 582 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 583 #endif 584 if (minor >= LP_NO) 585 return -ENODEV; 586 if ((LP_F(minor) & LP_EXIST) == 0) 587 return -ENODEV; 588 switch ( cmd ) { 589 case LPTIME: 590 LP_TIME(minor) = arg * HZ/100; 591 break; 592 case LPCHAR: 593 LP_CHAR(minor) = arg; 594 break; 595 case LPABORT: 596 if (arg) 597 LP_F(minor) |= LP_ABORT; 598 else 599 LP_F(minor) &= ~LP_ABORT; 600 break; 601 case LPABORTOPEN: 602 if (arg) 603 LP_F(minor) |= LP_ABORTOPEN; 604 else 605 LP_F(minor) &= ~LP_ABORTOPEN; 606 break; 607 case LPCAREFUL: 608 if (arg) 609 LP_F(minor) |= LP_CAREFUL; 610 else 611 LP_F(minor) &= ~LP_CAREFUL; 612 break; 613 case LPWAIT: 614 LP_WAIT(minor) = arg; 615 break; 616 case LPSETIRQ: 617 return -EINVAL; 618 break; 619 case LPGETIRQ: 620 if (copy_to_user(argp, &LP_IRQ(minor), 621 sizeof(int))) 622 return -EFAULT; 623 break; 624 case LPGETSTATUS: 625 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 626 return -EINTR; 627 lp_claim_parport_or_block (&lp_table[minor]); 628 status = r_str(minor); 629 lp_release_parport (&lp_table[minor]); 630 mutex_unlock(&lp_table[minor].port_mutex); 631 632 if (copy_to_user(argp, &status, sizeof(int))) 633 return -EFAULT; 634 break; 635 case LPRESET: 636 lp_reset(minor); 637 break; 638 #ifdef LP_STATS 639 case LPGETSTATS: 640 if (copy_to_user(argp, &LP_STAT(minor), 641 sizeof(struct lp_stats))) 642 return -EFAULT; 643 if (capable(CAP_SYS_ADMIN)) 644 memset(&LP_STAT(minor), 0, 645 sizeof(struct lp_stats)); 646 break; 647 #endif 648 case LPGETFLAGS: 649 status = LP_F(minor); 650 if (copy_to_user(argp, &status, sizeof(int))) 651 return -EFAULT; 652 break; 653 654 default: 655 retval = -EINVAL; 656 } 657 return retval; 658 } 659 660 static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout) 661 { 662 long to_jiffies; 663 664 /* Convert to jiffies, place in lp_table */ 665 if ((par_timeout->tv_sec < 0) || 666 (par_timeout->tv_usec < 0)) { 667 return -EINVAL; 668 } 669 to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ); 670 to_jiffies += par_timeout->tv_sec * (long) HZ; 671 if (to_jiffies <= 0) { 672 return -EINVAL; 673 } 674 lp_table[minor].timeout = to_jiffies; 675 return 0; 676 } 677 678 static long lp_ioctl(struct file *file, unsigned int cmd, 679 unsigned long arg) 680 { 681 unsigned int minor; 682 struct timeval par_timeout; 683 int ret; 684 685 minor = iminor(file_inode(file)); 686 mutex_lock(&lp_mutex); 687 switch (cmd) { 688 case LPSETTIMEOUT: 689 if (copy_from_user(&par_timeout, (void __user *)arg, 690 sizeof (struct timeval))) { 691 ret = -EFAULT; 692 break; 693 } 694 ret = lp_set_timeout(minor, &par_timeout); 695 break; 696 default: 697 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 698 break; 699 } 700 mutex_unlock(&lp_mutex); 701 702 return ret; 703 } 704 705 #ifdef CONFIG_COMPAT 706 static long lp_compat_ioctl(struct file *file, unsigned int cmd, 707 unsigned long arg) 708 { 709 unsigned int minor; 710 struct timeval par_timeout; 711 int ret; 712 713 minor = iminor(file_inode(file)); 714 mutex_lock(&lp_mutex); 715 switch (cmd) { 716 case LPSETTIMEOUT: 717 if (compat_get_timeval(&par_timeout, compat_ptr(arg))) { 718 ret = -EFAULT; 719 break; 720 } 721 ret = lp_set_timeout(minor, &par_timeout); 722 break; 723 #ifdef LP_STATS 724 case LPGETSTATS: 725 /* FIXME: add an implementation if you set LP_STATS */ 726 ret = -EINVAL; 727 break; 728 #endif 729 default: 730 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 731 break; 732 } 733 mutex_unlock(&lp_mutex); 734 735 return ret; 736 } 737 #endif 738 739 static const struct file_operations lp_fops = { 740 .owner = THIS_MODULE, 741 .write = lp_write, 742 .unlocked_ioctl = lp_ioctl, 743 #ifdef CONFIG_COMPAT 744 .compat_ioctl = lp_compat_ioctl, 745 #endif 746 .open = lp_open, 747 .release = lp_release, 748 #ifdef CONFIG_PARPORT_1284 749 .read = lp_read, 750 #endif 751 .llseek = noop_llseek, 752 }; 753 754 /* --- support for console on the line printer ----------------- */ 755 756 #ifdef CONFIG_LP_CONSOLE 757 758 #define CONSOLE_LP 0 759 760 /* If the printer is out of paper, we can either lose the messages or 761 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 762 * non-zero to get the latter behaviour. */ 763 #define CONSOLE_LP_STRICT 1 764 765 /* The console must be locked when we get here. */ 766 767 static void lp_console_write (struct console *co, const char *s, 768 unsigned count) 769 { 770 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 771 struct parport *port = dev->port; 772 ssize_t written; 773 774 if (parport_claim (dev)) 775 /* Nothing we can do. */ 776 return; 777 778 parport_set_timeout (dev, 0); 779 780 /* Go to compatibility mode. */ 781 parport_negotiate (port, IEEE1284_MODE_COMPAT); 782 783 do { 784 /* Write the data, converting LF->CRLF as we go. */ 785 ssize_t canwrite = count; 786 char *lf = memchr (s, '\n', count); 787 if (lf) 788 canwrite = lf - s; 789 790 if (canwrite > 0) { 791 written = parport_write (port, s, canwrite); 792 793 if (written <= 0) 794 continue; 795 796 s += written; 797 count -= written; 798 canwrite -= written; 799 } 800 801 if (lf && canwrite <= 0) { 802 const char *crlf = "\r\n"; 803 int i = 2; 804 805 /* Dodge the original '\n', and put '\r\n' instead. */ 806 s++; 807 count--; 808 do { 809 written = parport_write (port, crlf, i); 810 if (written > 0) 811 i -= written, crlf += written; 812 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 813 } 814 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 815 816 parport_release (dev); 817 } 818 819 static struct console lpcons = { 820 .name = "lp", 821 .write = lp_console_write, 822 .flags = CON_PRINTBUFFER, 823 }; 824 825 #endif /* console on line printer */ 826 827 /* --- initialisation code ------------------------------------- */ 828 829 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 830 static char *parport[LP_NO]; 831 static bool reset; 832 833 module_param_array(parport, charp, NULL, 0); 834 module_param(reset, bool, 0); 835 836 #ifndef MODULE 837 static int __init lp_setup (char *str) 838 { 839 static int parport_ptr; 840 int x; 841 842 if (get_option(&str, &x)) { 843 if (x == 0) { 844 /* disable driver on "lp=" or "lp=0" */ 845 parport_nr[0] = LP_PARPORT_OFF; 846 } else { 847 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 848 return 0; 849 } 850 } else if (!strncmp(str, "parport", 7)) { 851 int n = simple_strtoul(str+7, NULL, 10); 852 if (parport_ptr < LP_NO) 853 parport_nr[parport_ptr++] = n; 854 else 855 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 856 str); 857 } else if (!strcmp(str, "auto")) { 858 parport_nr[0] = LP_PARPORT_AUTO; 859 } else if (!strcmp(str, "none")) { 860 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 861 } else if (!strcmp(str, "reset")) { 862 reset = 1; 863 } 864 return 1; 865 } 866 #endif 867 868 static int lp_register(int nr, struct parport *port) 869 { 870 lp_table[nr].dev = parport_register_device(port, "lp", 871 lp_preempt, NULL, NULL, 0, 872 (void *) &lp_table[nr]); 873 if (lp_table[nr].dev == NULL) 874 return 1; 875 lp_table[nr].flags |= LP_EXIST; 876 877 if (reset) 878 lp_reset(nr); 879 880 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 881 "lp%d", nr); 882 883 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 884 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 885 886 #ifdef CONFIG_LP_CONSOLE 887 if (!nr) { 888 if (port->modes & PARPORT_MODE_SAFEININT) { 889 register_console(&lpcons); 890 console_registered = port; 891 printk (KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 892 } else 893 printk (KERN_ERR "lp%d: cannot run console on %s\n", 894 CONSOLE_LP, port->name); 895 } 896 #endif 897 898 return 0; 899 } 900 901 static void lp_attach (struct parport *port) 902 { 903 unsigned int i; 904 905 switch (parport_nr[0]) { 906 case LP_PARPORT_UNSPEC: 907 case LP_PARPORT_AUTO: 908 if (parport_nr[0] == LP_PARPORT_AUTO && 909 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 910 return; 911 if (lp_count == LP_NO) { 912 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 913 return; 914 } 915 if (!lp_register(lp_count, port)) 916 lp_count++; 917 break; 918 919 default: 920 for (i = 0; i < LP_NO; i++) { 921 if (port->number == parport_nr[i]) { 922 if (!lp_register(i, port)) 923 lp_count++; 924 break; 925 } 926 } 927 break; 928 } 929 } 930 931 static void lp_detach (struct parport *port) 932 { 933 /* Write this some day. */ 934 #ifdef CONFIG_LP_CONSOLE 935 if (console_registered == port) { 936 unregister_console(&lpcons); 937 console_registered = NULL; 938 } 939 #endif /* CONFIG_LP_CONSOLE */ 940 } 941 942 static struct parport_driver lp_driver = { 943 .name = "lp", 944 .attach = lp_attach, 945 .detach = lp_detach, 946 }; 947 948 static int __init lp_init (void) 949 { 950 int i, err = 0; 951 952 if (parport_nr[0] == LP_PARPORT_OFF) 953 return 0; 954 955 for (i = 0; i < LP_NO; i++) { 956 lp_table[i].dev = NULL; 957 lp_table[i].flags = 0; 958 lp_table[i].chars = LP_INIT_CHAR; 959 lp_table[i].time = LP_INIT_TIME; 960 lp_table[i].wait = LP_INIT_WAIT; 961 lp_table[i].lp_buffer = NULL; 962 #ifdef LP_STATS 963 lp_table[i].lastcall = 0; 964 lp_table[i].runchars = 0; 965 memset (&lp_table[i].stats, 0, sizeof (struct lp_stats)); 966 #endif 967 lp_table[i].last_error = 0; 968 init_waitqueue_head (&lp_table[i].waitq); 969 init_waitqueue_head (&lp_table[i].dataq); 970 mutex_init(&lp_table[i].port_mutex); 971 lp_table[i].timeout = 10 * HZ; 972 } 973 974 if (register_chrdev (LP_MAJOR, "lp", &lp_fops)) { 975 printk (KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 976 return -EIO; 977 } 978 979 lp_class = class_create(THIS_MODULE, "printer"); 980 if (IS_ERR(lp_class)) { 981 err = PTR_ERR(lp_class); 982 goto out_reg; 983 } 984 985 if (parport_register_driver (&lp_driver)) { 986 printk (KERN_ERR "lp: unable to register with parport\n"); 987 err = -EIO; 988 goto out_class; 989 } 990 991 if (!lp_count) { 992 printk (KERN_INFO "lp: driver loaded but no devices found\n"); 993 #ifndef CONFIG_PARPORT_1284 994 if (parport_nr[0] == LP_PARPORT_AUTO) 995 printk (KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 996 #endif 997 } 998 999 return 0; 1000 1001 out_class: 1002 class_destroy(lp_class); 1003 out_reg: 1004 unregister_chrdev(LP_MAJOR, "lp"); 1005 return err; 1006 } 1007 1008 static int __init lp_init_module (void) 1009 { 1010 if (parport[0]) { 1011 /* The user gave some parameters. Let's see what they were. */ 1012 if (!strncmp(parport[0], "auto", 4)) 1013 parport_nr[0] = LP_PARPORT_AUTO; 1014 else { 1015 int n; 1016 for (n = 0; n < LP_NO && parport[n]; n++) { 1017 if (!strncmp(parport[n], "none", 4)) 1018 parport_nr[n] = LP_PARPORT_NONE; 1019 else { 1020 char *ep; 1021 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1022 if (ep != parport[n]) 1023 parport_nr[n] = r; 1024 else { 1025 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1026 return -ENODEV; 1027 } 1028 } 1029 } 1030 } 1031 } 1032 1033 return lp_init(); 1034 } 1035 1036 static void lp_cleanup_module (void) 1037 { 1038 unsigned int offset; 1039 1040 parport_unregister_driver (&lp_driver); 1041 1042 #ifdef CONFIG_LP_CONSOLE 1043 unregister_console (&lpcons); 1044 #endif 1045 1046 unregister_chrdev(LP_MAJOR, "lp"); 1047 for (offset = 0; offset < LP_NO; offset++) { 1048 if (lp_table[offset].dev == NULL) 1049 continue; 1050 parport_unregister_device(lp_table[offset].dev); 1051 device_destroy(lp_class, MKDEV(LP_MAJOR, offset)); 1052 } 1053 class_destroy(lp_class); 1054 } 1055 1056 __setup("lp=", lp_setup); 1057 module_init(lp_init_module); 1058 module_exit(lp_cleanup_module); 1059 1060 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1061 MODULE_LICENSE("GPL"); 1062