1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Generic parallel printer driver 4 * 5 * Copyright (C) 1992 by Jim Weigand and Linus Torvalds 6 * Copyright (C) 1992,1993 by Michael K. Johnson 7 * - Thanks much to Gunter Windau for pointing out to me where the error 8 * checking ought to be. 9 * Copyright (C) 1993 by Nigel Gamble (added interrupt code) 10 * Copyright (C) 1994 by Alan Cox (Modularised it) 11 * LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu 12 * Statistics and support for slow printers by Rob Janssen, rob@knoware.nl 13 * "lp=" command line parameters added by Grant Guenther, grant@torque.net 14 * lp_read (Status readback) support added by Carsten Gross, 15 * carsten@sol.wohnheim.uni-ulm.de 16 * Support for parport by Philip Blundell <philb@gnu.org> 17 * Parport sharing hacking by Andrea Arcangeli 18 * Fixed kernel_(to/from)_user memory copy to check for errors 19 * by Riccardo Facchetti <fizban@tin.it> 20 * 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au> 21 * Redesigned interrupt handling for handle printers with buggy handshake 22 * by Andrea Arcangeli, 11 May 1998 23 * Full efficient handling of printer with buggy irq handshake (now I have 24 * understood the meaning of the strange handshake). This is done sending new 25 * characters if the interrupt is just happened, even if the printer say to 26 * be still BUSY. This is needed at least with Epson Stylus Color. To enable 27 * the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below... 28 * Fixed the irq on the rising edge of the strobe case. 29 * Obsoleted the CAREFUL flag since a printer that doesn' t work with 30 * CAREFUL will block a bit after in lp_check_status(). 31 * Andrea Arcangeli, 15 Oct 1998 32 * Obsoleted and removed all the lowlevel stuff implemented in the last 33 * month to use the IEEE1284 functions (that handle the _new_ compatibilty 34 * mode fine). 35 */ 36 37/* This driver should, in theory, work with any parallel port that has an 38 * appropriate low-level driver; all I/O is done through the parport 39 * abstraction layer. 40 * 41 * If this driver is built into the kernel, you can configure it using the 42 * kernel command-line. For example: 43 * 44 * lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and 45 * bind lp2 to parport2) 46 * 47 * lp=auto (assign lp devices to all ports that 48 * have printers attached, as determined 49 * by the IEEE-1284 autoprobe) 50 * 51 * lp=reset (reset the printer during 52 * initialisation) 53 * 54 * lp=off (disable the printer driver entirely) 55 * 56 * If the driver is loaded as a module, similar functionality is available 57 * using module parameters. The equivalent of the above commands would be: 58 * 59 * # insmod lp.o parport=1,none,2 60 * 61 * # insmod lp.o parport=auto 62 * 63 * # insmod lp.o reset=1 64 */ 65 66/* COMPATIBILITY WITH OLD KERNELS 67 * 68 * Under Linux 2.0 and previous versions, lp devices were bound to ports at 69 * particular I/O addresses, as follows: 70 * 71 * lp0 0x3bc 72 * lp1 0x378 73 * lp2 0x278 74 * 75 * The new driver, by default, binds lp devices to parport devices as it 76 * finds them. This means that if you only have one port, it will be bound 77 * to lp0 regardless of its I/O address. If you need the old behaviour, you 78 * can force it using the parameters described above. 79 */ 80 81/* 82 * The new interrupt handling code take care of the buggy handshake 83 * of some HP and Epson printer: 84 * ___ 85 * ACK _______________ ___________ 86 * |__| 87 * ____ 88 * BUSY _________ _______ 89 * |____________| 90 * 91 * I discovered this using the printer scanner that you can find at: 92 * 93 * ftp://e-mind.com/pub/linux/pscan/ 94 * 95 * 11 May 98, Andrea Arcangeli 96 * 97 * My printer scanner run on an Epson Stylus Color show that such printer 98 * generates the irq on the _rising_ edge of the STROBE. Now lp handle 99 * this case fine too. 100 * 101 * 15 Oct 1998, Andrea Arcangeli 102 * 103 * The so called `buggy' handshake is really the well documented 104 * compatibility mode IEEE1284 handshake. They changed the well known 105 * Centronics handshake acking in the middle of busy expecting to not 106 * break drivers or legacy application, while they broken linux lp 107 * until I fixed it reverse engineering the protocol by hand some 108 * month ago... 109 * 110 * 14 Dec 1998, Andrea Arcangeli 111 * 112 * Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl) 113 */ 114 115#include <linux/module.h> 116#include <linux/init.h> 117 118#include <linux/errno.h> 119#include <linux/kernel.h> 120#include <linux/major.h> 121#include <linux/sched/signal.h> 122#include <linux/slab.h> 123#include <linux/fcntl.h> 124#include <linux/delay.h> 125#include <linux/poll.h> 126#include <linux/console.h> 127#include <linux/device.h> 128#include <linux/wait.h> 129#include <linux/jiffies.h> 130#include <linux/mutex.h> 131#include <linux/compat.h> 132 133#include <linux/parport.h> 134#undef LP_STATS 135#include <linux/lp.h> 136 137#include <asm/irq.h> 138#include <linux/uaccess.h> 139 140/* if you have more than 8 printers, remember to increase LP_NO */ 141#define LP_NO 8 142 143static DEFINE_MUTEX(lp_mutex); 144static struct lp_struct lp_table[LP_NO]; 145static int port_num[LP_NO]; 146 147static unsigned int lp_count = 0; 148static struct class *lp_class; 149 150#ifdef CONFIG_LP_CONSOLE 151static struct parport *console_registered; 152#endif /* CONFIG_LP_CONSOLE */ 153 154#undef LP_DEBUG 155 156/* Bits used to manage claiming the parport device */ 157#define LP_PREEMPT_REQUEST 1 158#define LP_PARPORT_CLAIMED 2 159 160/* --- low-level port access ----------------------------------- */ 161 162#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port)) 163#define r_str(x) (parport_read_status(lp_table[(x)].dev->port)) 164#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0) 165#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0) 166 167/* Claim the parport or block trying unless we've already claimed it */ 168static void lp_claim_parport_or_block(struct lp_struct *this_lp) 169{ 170 if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 171 parport_claim_or_block(this_lp->dev); 172 } 173} 174 175/* Claim the parport or block trying unless we've already claimed it */ 176static void lp_release_parport(struct lp_struct *this_lp) 177{ 178 if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) { 179 parport_release(this_lp->dev); 180 } 181} 182 183 184 185static int lp_preempt(void *handle) 186{ 187 struct lp_struct *this_lp = (struct lp_struct *)handle; 188 set_bit(LP_PREEMPT_REQUEST, &this_lp->bits); 189 return 1; 190} 191 192 193/* 194 * Try to negotiate to a new mode; if unsuccessful negotiate to 195 * compatibility mode. Return the mode we ended up in. 196 */ 197static int lp_negotiate(struct parport *port, int mode) 198{ 199 if (parport_negotiate(port, mode) != 0) { 200 mode = IEEE1284_MODE_COMPAT; 201 parport_negotiate(port, mode); 202 } 203 204 return mode; 205} 206 207static int lp_reset(int minor) 208{ 209 int retval; 210 lp_claim_parport_or_block(&lp_table[minor]); 211 w_ctr(minor, LP_PSELECP); 212 udelay(LP_DELAY); 213 w_ctr(minor, LP_PSELECP | LP_PINITP); 214 retval = r_str(minor); 215 lp_release_parport(&lp_table[minor]); 216 return retval; 217} 218 219static void lp_error(int minor) 220{ 221 DEFINE_WAIT(wait); 222 int polling; 223 224 if (LP_F(minor) & LP_ABORT) 225 return; 226 227 polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE; 228 if (polling) 229 lp_release_parport(&lp_table[minor]); 230 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 231 schedule_timeout(LP_TIMEOUT_POLLED); 232 finish_wait(&lp_table[minor].waitq, &wait); 233 if (polling) 234 lp_claim_parport_or_block(&lp_table[minor]); 235 else 236 parport_yield_blocking(lp_table[minor].dev); 237} 238 239static int lp_check_status(int minor) 240{ 241 int error = 0; 242 unsigned int last = lp_table[minor].last_error; 243 unsigned char status = r_str(minor); 244 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 245 /* No error. */ 246 last = 0; 247 else if ((status & LP_POUTPA)) { 248 if (last != LP_POUTPA) { 249 last = LP_POUTPA; 250 printk(KERN_INFO "lp%d out of paper\n", minor); 251 } 252 error = -ENOSPC; 253 } else if (!(status & LP_PSELECD)) { 254 if (last != LP_PSELECD) { 255 last = LP_PSELECD; 256 printk(KERN_INFO "lp%d off-line\n", minor); 257 } 258 error = -EIO; 259 } else if (!(status & LP_PERRORP)) { 260 if (last != LP_PERRORP) { 261 last = LP_PERRORP; 262 printk(KERN_INFO "lp%d on fire\n", minor); 263 } 264 error = -EIO; 265 } else { 266 last = 0; /* Come here if LP_CAREFUL is set and no 267 errors are reported. */ 268 } 269 270 lp_table[minor].last_error = last; 271 272 if (last != 0) 273 lp_error(minor); 274 275 return error; 276} 277 278static int lp_wait_ready(int minor, int nonblock) 279{ 280 int error = 0; 281 282 /* If we're not in compatibility mode, we're ready now! */ 283 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 284 return 0; 285 } 286 287 do { 288 error = lp_check_status(minor); 289 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 290 break; 291 if (signal_pending(current)) { 292 error = -EINTR; 293 break; 294 } 295 } while (error); 296 return error; 297} 298 299static ssize_t lp_write(struct file *file, const char __user *buf, 300 size_t count, loff_t *ppos) 301{ 302 unsigned int minor = iminor(file_inode(file)); 303 struct parport *port = lp_table[minor].dev->port; 304 char *kbuf = lp_table[minor].lp_buffer; 305 ssize_t retv = 0; 306 ssize_t written; 307 size_t copy_size = count; 308 int nonblock = ((file->f_flags & O_NONBLOCK) || 309 (LP_F(minor) & LP_ABORT)); 310 311#ifdef LP_STATS 312 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 313 lp_table[minor].runchars = 0; 314 315 lp_table[minor].lastcall = jiffies; 316#endif 317 318 /* Need to copy the data from user-space. */ 319 if (copy_size > LP_BUFFER_SIZE) 320 copy_size = LP_BUFFER_SIZE; 321 322 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 323 return -EINTR; 324 325 if (copy_from_user(kbuf, buf, copy_size)) { 326 retv = -EFAULT; 327 goto out_unlock; 328 } 329 330 /* Claim Parport or sleep until it becomes available 331 */ 332 lp_claim_parport_or_block(&lp_table[minor]); 333 /* Go to the proper mode. */ 334 lp_table[minor].current_mode = lp_negotiate(port, 335 lp_table[minor].best_mode); 336 337 parport_set_timeout(lp_table[minor].dev, 338 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 339 : lp_table[minor].timeout)); 340 341 if ((retv = lp_wait_ready(minor, nonblock)) == 0) 342 do { 343 /* Write the data. */ 344 written = parport_write(port, kbuf, copy_size); 345 if (written > 0) { 346 copy_size -= written; 347 count -= written; 348 buf += written; 349 retv += written; 350 } 351 352 if (signal_pending(current)) { 353 if (retv == 0) 354 retv = -EINTR; 355 356 break; 357 } 358 359 if (copy_size > 0) { 360 /* incomplete write -> check error ! */ 361 int error; 362 363 parport_negotiate(lp_table[minor].dev->port, 364 IEEE1284_MODE_COMPAT); 365 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 366 367 error = lp_wait_ready(minor, nonblock); 368 369 if (error) { 370 if (retv == 0) 371 retv = error; 372 break; 373 } else if (nonblock) { 374 if (retv == 0) 375 retv = -EAGAIN; 376 break; 377 } 378 379 parport_yield_blocking(lp_table[minor].dev); 380 lp_table[minor].current_mode 381 = lp_negotiate(port, 382 lp_table[minor].best_mode); 383 384 } else if (need_resched()) 385 schedule(); 386 387 if (count) { 388 copy_size = count; 389 if (copy_size > LP_BUFFER_SIZE) 390 copy_size = LP_BUFFER_SIZE; 391 392 if (copy_from_user(kbuf, buf, copy_size)) { 393 if (retv == 0) 394 retv = -EFAULT; 395 break; 396 } 397 } 398 } while (count > 0); 399 400 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 401 &lp_table[minor].bits)) { 402 printk(KERN_INFO "lp%d releasing parport\n", minor); 403 parport_negotiate(lp_table[minor].dev->port, 404 IEEE1284_MODE_COMPAT); 405 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 406 lp_release_parport(&lp_table[minor]); 407 } 408out_unlock: 409 mutex_unlock(&lp_table[minor].port_mutex); 410 411 return retv; 412} 413 414#ifdef CONFIG_PARPORT_1284 415 416/* Status readback conforming to ieee1284 */ 417static ssize_t lp_read(struct file *file, char __user *buf, 418 size_t count, loff_t *ppos) 419{ 420 DEFINE_WAIT(wait); 421 unsigned int minor=iminor(file_inode(file)); 422 struct parport *port = lp_table[minor].dev->port; 423 ssize_t retval = 0; 424 char *kbuf = lp_table[minor].lp_buffer; 425 int nonblock = ((file->f_flags & O_NONBLOCK) || 426 (LP_F(minor) & LP_ABORT)); 427 428 if (count > LP_BUFFER_SIZE) 429 count = LP_BUFFER_SIZE; 430 431 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 432 return -EINTR; 433 434 lp_claim_parport_or_block(&lp_table[minor]); 435 436 parport_set_timeout(lp_table[minor].dev, 437 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 438 : lp_table[minor].timeout)); 439 440 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 441 if (parport_negotiate(lp_table[minor].dev->port, 442 IEEE1284_MODE_NIBBLE)) { 443 retval = -EIO; 444 goto out; 445 } 446 447 while (retval == 0) { 448 retval = parport_read(port, kbuf, count); 449 450 if (retval > 0) 451 break; 452 453 if (nonblock) { 454 retval = -EAGAIN; 455 break; 456 } 457 458 /* Wait for data. */ 459 460 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 461 parport_negotiate(lp_table[minor].dev->port, 462 IEEE1284_MODE_COMPAT); 463 lp_error(minor); 464 if (parport_negotiate(lp_table[minor].dev->port, 465 IEEE1284_MODE_NIBBLE)) { 466 retval = -EIO; 467 goto out; 468 } 469 } else { 470 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 471 schedule_timeout(LP_TIMEOUT_POLLED); 472 finish_wait(&lp_table[minor].waitq, &wait); 473 } 474 475 if (signal_pending(current)) { 476 retval = -ERESTARTSYS; 477 break; 478 } 479 480 cond_resched(); 481 } 482 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 483 out: 484 lp_release_parport(&lp_table[minor]); 485 486 if (retval > 0 && copy_to_user(buf, kbuf, retval)) 487 retval = -EFAULT; 488 489 mutex_unlock(&lp_table[minor].port_mutex); 490 491 return retval; 492} 493 494#endif /* IEEE 1284 support */ 495 496static int lp_open(struct inode *inode, struct file *file) 497{ 498 unsigned int minor = iminor(inode); 499 int ret = 0; 500 501 mutex_lock(&lp_mutex); 502 if (minor >= LP_NO) { 503 ret = -ENXIO; 504 goto out; 505 } 506 if ((LP_F(minor) & LP_EXIST) == 0) { 507 ret = -ENXIO; 508 goto out; 509 } 510 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) { 511 ret = -EBUSY; 512 goto out; 513 } 514 /* If ABORTOPEN is set and the printer is offline or out of paper, 515 we may still want to open it to perform ioctl()s. Therefore we 516 have commandeered O_NONBLOCK, even though it is being used in 517 a non-standard manner. This is strictly a Linux hack, and 518 should most likely only ever be used by the tunelp application. */ 519 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 520 int status; 521 lp_claim_parport_or_block(&lp_table[minor]); 522 status = r_str(minor); 523 lp_release_parport(&lp_table[minor]); 524 if (status & LP_POUTPA) { 525 printk(KERN_INFO "lp%d out of paper\n", minor); 526 LP_F(minor) &= ~LP_BUSY; 527 ret = -ENOSPC; 528 goto out; 529 } else if (!(status & LP_PSELECD)) { 530 printk(KERN_INFO "lp%d off-line\n", minor); 531 LP_F(minor) &= ~LP_BUSY; 532 ret = -EIO; 533 goto out; 534 } else if (!(status & LP_PERRORP)) { 535 printk(KERN_ERR "lp%d printer error\n", minor); 536 LP_F(minor) &= ~LP_BUSY; 537 ret = -EIO; 538 goto out; 539 } 540 } 541 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 542 if (!lp_table[minor].lp_buffer) { 543 LP_F(minor) &= ~LP_BUSY; 544 ret = -ENOMEM; 545 goto out; 546 } 547 /* Determine if the peripheral supports ECP mode */ 548 lp_claim_parport_or_block(&lp_table[minor]); 549 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 550 !parport_negotiate(lp_table[minor].dev->port, 551 IEEE1284_MODE_ECP)) { 552 printk(KERN_INFO "lp%d: ECP mode\n", minor); 553 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 554 } else { 555 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 556 } 557 /* Leave peripheral in compatibility mode */ 558 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 559 lp_release_parport(&lp_table[minor]); 560 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 561out: 562 mutex_unlock(&lp_mutex); 563 return ret; 564} 565 566static int lp_release(struct inode *inode, struct file *file) 567{ 568 unsigned int minor = iminor(inode); 569 570 lp_claim_parport_or_block(&lp_table[minor]); 571 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 572 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 573 lp_release_parport(&lp_table[minor]); 574 kfree(lp_table[minor].lp_buffer); 575 lp_table[minor].lp_buffer = NULL; 576 LP_F(minor) &= ~LP_BUSY; 577 return 0; 578} 579 580static int lp_do_ioctl(unsigned int minor, unsigned int cmd, 581 unsigned long arg, void __user *argp) 582{ 583 int status; 584 int retval = 0; 585 586#ifdef LP_DEBUG 587 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 588#endif 589 if (minor >= LP_NO) 590 return -ENODEV; 591 if ((LP_F(minor) & LP_EXIST) == 0) 592 return -ENODEV; 593 switch ( cmd ) { 594 case LPTIME: 595 if (arg > UINT_MAX / HZ) 596 return -EINVAL; 597 LP_TIME(minor) = arg * HZ/100; 598 break; 599 case LPCHAR: 600 LP_CHAR(minor) = arg; 601 break; 602 case LPABORT: 603 if (arg) 604 LP_F(minor) |= LP_ABORT; 605 else 606 LP_F(minor) &= ~LP_ABORT; 607 break; 608 case LPABORTOPEN: 609 if (arg) 610 LP_F(minor) |= LP_ABORTOPEN; 611 else 612 LP_F(minor) &= ~LP_ABORTOPEN; 613 break; 614 case LPCAREFUL: 615 if (arg) 616 LP_F(minor) |= LP_CAREFUL; 617 else 618 LP_F(minor) &= ~LP_CAREFUL; 619 break; 620 case LPWAIT: 621 LP_WAIT(minor) = arg; 622 break; 623 case LPSETIRQ: 624 return -EINVAL; 625 break; 626 case LPGETIRQ: 627 if (copy_to_user(argp, &LP_IRQ(minor), 628 sizeof(int))) 629 return -EFAULT; 630 break; 631 case LPGETSTATUS: 632 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 633 return -EINTR; 634 lp_claim_parport_or_block(&lp_table[minor]); 635 status = r_str(minor); 636 lp_release_parport(&lp_table[minor]); 637 mutex_unlock(&lp_table[minor].port_mutex); 638 639 if (copy_to_user(argp, &status, sizeof(int))) 640 return -EFAULT; 641 break; 642 case LPRESET: 643 lp_reset(minor); 644 break; 645#ifdef LP_STATS 646 case LPGETSTATS: 647 if (copy_to_user(argp, &LP_STAT(minor), 648 sizeof(struct lp_stats))) 649 return -EFAULT; 650 if (capable(CAP_SYS_ADMIN)) 651 memset(&LP_STAT(minor), 0, 652 sizeof(struct lp_stats)); 653 break; 654#endif 655 case LPGETFLAGS: 656 status = LP_F(minor); 657 if (copy_to_user(argp, &status, sizeof(int))) 658 return -EFAULT; 659 break; 660 661 default: 662 retval = -EINVAL; 663 } 664 return retval; 665} 666 667static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec) 668{ 669 long to_jiffies; 670 671 /* Convert to jiffies, place in lp_table */ 672 if (tv_sec < 0 || tv_usec < 0) 673 return -EINVAL; 674 675 /* 676 * we used to not check, so let's not make this fatal, 677 * but deal with user space passing a 32-bit tv_nsec in 678 * a 64-bit field, capping the timeout to 1 second 679 * worth of microseconds, and capping the total at 680 * MAX_JIFFY_OFFSET. 681 */ 682 if (tv_usec > 999999) 683 tv_usec = 999999; 684 685 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) { 686 to_jiffies = MAX_JIFFY_OFFSET; 687 } else { 688 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ); 689 to_jiffies += tv_sec * (long) HZ; 690 } 691 692 if (to_jiffies <= 0) { 693 return -EINVAL; 694 } 695 lp_table[minor].timeout = to_jiffies; 696 return 0; 697} 698 699static int lp_set_timeout32(unsigned int minor, void __user *arg) 700{ 701 s32 karg[2]; 702 703 if (copy_from_user(karg, arg, sizeof(karg))) 704 return -EFAULT; 705 706 return lp_set_timeout(minor, karg[0], karg[1]); 707} 708 709static int lp_set_timeout64(unsigned int minor, void __user *arg) 710{ 711 s64 karg[2]; 712 713 if (copy_from_user(karg, arg, sizeof(karg))) 714 return -EFAULT; 715 716 /* sparc64 suseconds_t is 32-bit only */ 717 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) 718 karg[1] >>= 32; 719 720 return lp_set_timeout(minor, karg[0], karg[1]); 721} 722 723static long lp_ioctl(struct file *file, unsigned int cmd, 724 unsigned long arg) 725{ 726 unsigned int minor; 727 int ret; 728 729 minor = iminor(file_inode(file)); 730 mutex_lock(&lp_mutex); 731 switch (cmd) { 732 case LPSETTIMEOUT_OLD: 733 if (BITS_PER_LONG == 32) { 734 ret = lp_set_timeout32(minor, (void __user *)arg); 735 break; 736 } 737 fallthrough; /* for 64-bit */ 738 case LPSETTIMEOUT_NEW: 739 ret = lp_set_timeout64(minor, (void __user *)arg); 740 break; 741 default: 742 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 743 break; 744 } 745 mutex_unlock(&lp_mutex); 746 747 return ret; 748} 749 750#ifdef CONFIG_COMPAT 751static long lp_compat_ioctl(struct file *file, unsigned int cmd, 752 unsigned long arg) 753{ 754 unsigned int minor; 755 int ret; 756 757 minor = iminor(file_inode(file)); 758 mutex_lock(&lp_mutex); 759 switch (cmd) { 760 case LPSETTIMEOUT_OLD: 761 if (!COMPAT_USE_64BIT_TIME) { 762 ret = lp_set_timeout32(minor, (void __user *)arg); 763 break; 764 } 765 fallthrough; /* for x32 mode */ 766 case LPSETTIMEOUT_NEW: 767 ret = lp_set_timeout64(minor, (void __user *)arg); 768 break; 769#ifdef LP_STATS 770 case LPGETSTATS: 771 /* FIXME: add an implementation if you set LP_STATS */ 772 ret = -EINVAL; 773 break; 774#endif 775 default: 776 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 777 break; 778 } 779 mutex_unlock(&lp_mutex); 780 781 return ret; 782} 783#endif 784 785static const struct file_operations lp_fops = { 786 .owner = THIS_MODULE, 787 .write = lp_write, 788 .unlocked_ioctl = lp_ioctl, 789#ifdef CONFIG_COMPAT 790 .compat_ioctl = lp_compat_ioctl, 791#endif 792 .open = lp_open, 793 .release = lp_release, 794#ifdef CONFIG_PARPORT_1284 795 .read = lp_read, 796#endif 797 .llseek = noop_llseek, 798}; 799 800/* --- support for console on the line printer ----------------- */ 801 802#ifdef CONFIG_LP_CONSOLE 803 804#define CONSOLE_LP 0 805 806/* If the printer is out of paper, we can either lose the messages or 807 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 808 * non-zero to get the latter behaviour. */ 809#define CONSOLE_LP_STRICT 1 810 811/* The console must be locked when we get here. */ 812 813static void lp_console_write(struct console *co, const char *s, 814 unsigned count) 815{ 816 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 817 struct parport *port = dev->port; 818 ssize_t written; 819 820 if (parport_claim(dev)) 821 /* Nothing we can do. */ 822 return; 823 824 parport_set_timeout(dev, 0); 825 826 /* Go to compatibility mode. */ 827 parport_negotiate(port, IEEE1284_MODE_COMPAT); 828 829 do { 830 /* Write the data, converting LF->CRLF as we go. */ 831 ssize_t canwrite = count; 832 char *lf = memchr(s, '\n', count); 833 if (lf) 834 canwrite = lf - s; 835 836 if (canwrite > 0) { 837 written = parport_write(port, s, canwrite); 838 839 if (written <= 0) 840 continue; 841 842 s += written; 843 count -= written; 844 canwrite -= written; 845 } 846 847 if (lf && canwrite <= 0) { 848 const char *crlf = "\r\n"; 849 int i = 2; 850 851 /* Dodge the original '\n', and put '\r\n' instead. */ 852 s++; 853 count--; 854 do { 855 written = parport_write(port, crlf, i); 856 if (written > 0) { 857 i -= written; 858 crlf += written; 859 } 860 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 861 } 862 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 863 864 parport_release(dev); 865} 866 867static struct console lpcons = { 868 .name = "lp", 869 .write = lp_console_write, 870 .flags = CON_PRINTBUFFER, 871}; 872 873#endif /* console on line printer */ 874 875/* --- initialisation code ------------------------------------- */ 876 877static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 878static char *parport[LP_NO]; 879static bool reset; 880 881module_param_array(parport, charp, NULL, 0); 882module_param(reset, bool, 0); 883 884#ifndef MODULE 885static int __init lp_setup(char *str) 886{ 887 static int parport_ptr; 888 int x; 889 890 if (get_option(&str, &x)) { 891 if (x == 0) { 892 /* disable driver on "lp=" or "lp=0" */ 893 parport_nr[0] = LP_PARPORT_OFF; 894 } else { 895 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 896 return 0; 897 } 898 } else if (!strncmp(str, "parport", 7)) { 899 int n = simple_strtoul(str+7, NULL, 10); 900 if (parport_ptr < LP_NO) 901 parport_nr[parport_ptr++] = n; 902 else 903 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 904 str); 905 } else if (!strcmp(str, "auto")) { 906 parport_nr[0] = LP_PARPORT_AUTO; 907 } else if (!strcmp(str, "none")) { 908 if (parport_ptr < LP_NO) 909 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 910 else 911 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 912 str); 913 } else if (!strcmp(str, "reset")) { 914 reset = true; 915 } 916 return 1; 917} 918#endif 919 920static int lp_register(int nr, struct parport *port) 921{ 922 struct pardev_cb ppdev_cb; 923 924 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 925 ppdev_cb.preempt = lp_preempt; 926 ppdev_cb.private = &lp_table[nr]; 927 lp_table[nr].dev = parport_register_dev_model(port, "lp", 928 &ppdev_cb, nr); 929 if (lp_table[nr].dev == NULL) 930 return 1; 931 lp_table[nr].flags |= LP_EXIST; 932 933 if (reset) 934 lp_reset(nr); 935 936 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 937 "lp%d", nr); 938 939 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 940 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 941 942#ifdef CONFIG_LP_CONSOLE 943 if (!nr) { 944 if (port->modes & PARPORT_MODE_SAFEININT) { 945 register_console(&lpcons); 946 console_registered = port; 947 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 948 } else 949 printk(KERN_ERR "lp%d: cannot run console on %s\n", 950 CONSOLE_LP, port->name); 951 } 952#endif 953 port_num[nr] = port->number; 954 955 return 0; 956} 957 958static void lp_attach(struct parport *port) 959{ 960 unsigned int i; 961 962 switch (parport_nr[0]) { 963 case LP_PARPORT_UNSPEC: 964 case LP_PARPORT_AUTO: 965 if (parport_nr[0] == LP_PARPORT_AUTO && 966 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 967 return; 968 if (lp_count == LP_NO) { 969 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 970 return; 971 } 972 for (i = 0; i < LP_NO; i++) 973 if (port_num[i] == -1) 974 break; 975 976 if (!lp_register(i, port)) 977 lp_count++; 978 break; 979 980 default: 981 for (i = 0; i < LP_NO; i++) { 982 if (port->number == parport_nr[i]) { 983 if (!lp_register(i, port)) 984 lp_count++; 985 break; 986 } 987 } 988 break; 989 } 990} 991 992static void lp_detach(struct parport *port) 993{ 994 int n; 995 996 /* Write this some day. */ 997#ifdef CONFIG_LP_CONSOLE 998 if (console_registered == port) { 999 unregister_console(&lpcons); 1000 console_registered = NULL; 1001 } 1002#endif /* CONFIG_LP_CONSOLE */ 1003 1004 for (n = 0; n < LP_NO; n++) { 1005 if (port_num[n] == port->number) { 1006 port_num[n] = -1; 1007 lp_count--; 1008 device_destroy(lp_class, MKDEV(LP_MAJOR, n)); 1009 parport_unregister_device(lp_table[n].dev); 1010 } 1011 } 1012} 1013 1014static struct parport_driver lp_driver = { 1015 .name = "lp", 1016 .match_port = lp_attach, 1017 .detach = lp_detach, 1018 .devmodel = true, 1019}; 1020 1021static int __init lp_init(void) 1022{ 1023 int i, err = 0; 1024 1025 if (parport_nr[0] == LP_PARPORT_OFF) 1026 return 0; 1027 1028 for (i = 0; i < LP_NO; i++) { 1029 lp_table[i].dev = NULL; 1030 lp_table[i].flags = 0; 1031 lp_table[i].chars = LP_INIT_CHAR; 1032 lp_table[i].time = LP_INIT_TIME; 1033 lp_table[i].wait = LP_INIT_WAIT; 1034 lp_table[i].lp_buffer = NULL; 1035#ifdef LP_STATS 1036 lp_table[i].lastcall = 0; 1037 lp_table[i].runchars = 0; 1038 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats)); 1039#endif 1040 lp_table[i].last_error = 0; 1041 init_waitqueue_head(&lp_table[i].waitq); 1042 init_waitqueue_head(&lp_table[i].dataq); 1043 mutex_init(&lp_table[i].port_mutex); 1044 lp_table[i].timeout = 10 * HZ; 1045 port_num[i] = -1; 1046 } 1047 1048 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) { 1049 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 1050 return -EIO; 1051 } 1052 1053 lp_class = class_create(THIS_MODULE, "printer"); 1054 if (IS_ERR(lp_class)) { 1055 err = PTR_ERR(lp_class); 1056 goto out_reg; 1057 } 1058 1059 if (parport_register_driver(&lp_driver)) { 1060 printk(KERN_ERR "lp: unable to register with parport\n"); 1061 err = -EIO; 1062 goto out_class; 1063 } 1064 1065 if (!lp_count) { 1066 printk(KERN_INFO "lp: driver loaded but no devices found\n"); 1067#ifndef CONFIG_PARPORT_1284 1068 if (parport_nr[0] == LP_PARPORT_AUTO) 1069 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 1070#endif 1071 } 1072 1073 return 0; 1074 1075out_class: 1076 class_destroy(lp_class); 1077out_reg: 1078 unregister_chrdev(LP_MAJOR, "lp"); 1079 return err; 1080} 1081 1082static int __init lp_init_module(void) 1083{ 1084 if (parport[0]) { 1085 /* The user gave some parameters. Let's see what they were. */ 1086 if (!strncmp(parport[0], "auto", 4)) 1087 parport_nr[0] = LP_PARPORT_AUTO; 1088 else { 1089 int n; 1090 for (n = 0; n < LP_NO && parport[n]; n++) { 1091 if (!strncmp(parport[n], "none", 4)) 1092 parport_nr[n] = LP_PARPORT_NONE; 1093 else { 1094 char *ep; 1095 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1096 if (ep != parport[n]) 1097 parport_nr[n] = r; 1098 else { 1099 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1100 return -ENODEV; 1101 } 1102 } 1103 } 1104 } 1105 } 1106 1107 return lp_init(); 1108} 1109 1110static void lp_cleanup_module(void) 1111{ 1112 parport_unregister_driver(&lp_driver); 1113 1114#ifdef CONFIG_LP_CONSOLE 1115 unregister_console(&lpcons); 1116#endif 1117 1118 unregister_chrdev(LP_MAJOR, "lp"); 1119 class_destroy(lp_class); 1120} 1121 1122__setup("lp=", lp_setup); 1123module_init(lp_init_module); 1124module_exit(lp_cleanup_module); 1125 1126MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1127MODULE_LICENSE("GPL"); 1128