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 8 142 143 static DEFINE_MUTEX(lp_mutex); 144 static struct lp_struct lp_table[LP_NO]; 145 static int port_num[LP_NO]; 146 147 static unsigned int lp_count = 0; 148 static struct class *lp_class; 149 150 #ifdef CONFIG_LP_CONSOLE 151 static 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 */ 168 static 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 */ 176 static 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 } 182 183 184 185 static 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 */ 197 static 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 } 206 207 static 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 } 218 219 static 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 } 238 239 static 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 } 277 278 static 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 } 298 299 static 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 } 408 out_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 */ 417 static 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 */ 495 496 static 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; 561 out: 562 mutex_unlock(&lp_mutex); 563 return ret; 564 } 565 566 static 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 } 579 580 static 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 case LPGETIRQ: 626 if (copy_to_user(argp, &LP_IRQ(minor), 627 sizeof(int))) 628 return -EFAULT; 629 break; 630 case LPGETSTATUS: 631 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 632 return -EINTR; 633 lp_claim_parport_or_block(&lp_table[minor]); 634 status = r_str(minor); 635 lp_release_parport(&lp_table[minor]); 636 mutex_unlock(&lp_table[minor].port_mutex); 637 638 if (copy_to_user(argp, &status, sizeof(int))) 639 return -EFAULT; 640 break; 641 case LPRESET: 642 lp_reset(minor); 643 break; 644 #ifdef LP_STATS 645 case LPGETSTATS: 646 if (copy_to_user(argp, &LP_STAT(minor), 647 sizeof(struct lp_stats))) 648 return -EFAULT; 649 if (capable(CAP_SYS_ADMIN)) 650 memset(&LP_STAT(minor), 0, 651 sizeof(struct lp_stats)); 652 break; 653 #endif 654 case LPGETFLAGS: 655 status = LP_F(minor); 656 if (copy_to_user(argp, &status, sizeof(int))) 657 return -EFAULT; 658 break; 659 660 default: 661 retval = -EINVAL; 662 } 663 return retval; 664 } 665 666 static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec) 667 { 668 long to_jiffies; 669 670 /* Convert to jiffies, place in lp_table */ 671 if (tv_sec < 0 || tv_usec < 0) 672 return -EINVAL; 673 674 /* 675 * we used to not check, so let's not make this fatal, 676 * but deal with user space passing a 32-bit tv_nsec in 677 * a 64-bit field, capping the timeout to 1 second 678 * worth of microseconds, and capping the total at 679 * MAX_JIFFY_OFFSET. 680 */ 681 if (tv_usec > 999999) 682 tv_usec = 999999; 683 684 if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) { 685 to_jiffies = MAX_JIFFY_OFFSET; 686 } else { 687 to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ); 688 to_jiffies += tv_sec * (long) HZ; 689 } 690 691 if (to_jiffies <= 0) { 692 return -EINVAL; 693 } 694 lp_table[minor].timeout = to_jiffies; 695 return 0; 696 } 697 698 static int lp_set_timeout32(unsigned int minor, void __user *arg) 699 { 700 s32 karg[2]; 701 702 if (copy_from_user(karg, arg, sizeof(karg))) 703 return -EFAULT; 704 705 return lp_set_timeout(minor, karg[0], karg[1]); 706 } 707 708 static int lp_set_timeout64(unsigned int minor, void __user *arg) 709 { 710 s64 karg[2]; 711 712 if (copy_from_user(karg, arg, sizeof(karg))) 713 return -EFAULT; 714 715 /* sparc64 suseconds_t is 32-bit only */ 716 if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) 717 karg[1] >>= 32; 718 719 return lp_set_timeout(minor, karg[0], karg[1]); 720 } 721 722 static long lp_ioctl(struct file *file, unsigned int cmd, 723 unsigned long arg) 724 { 725 unsigned int minor; 726 int ret; 727 728 minor = iminor(file_inode(file)); 729 mutex_lock(&lp_mutex); 730 switch (cmd) { 731 case LPSETTIMEOUT_OLD: 732 if (BITS_PER_LONG == 32) { 733 ret = lp_set_timeout32(minor, (void __user *)arg); 734 break; 735 } 736 fallthrough; /* for 64-bit */ 737 case LPSETTIMEOUT_NEW: 738 ret = lp_set_timeout64(minor, (void __user *)arg); 739 break; 740 default: 741 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 742 break; 743 } 744 mutex_unlock(&lp_mutex); 745 746 return ret; 747 } 748 749 #ifdef CONFIG_COMPAT 750 static long lp_compat_ioctl(struct file *file, unsigned int cmd, 751 unsigned long arg) 752 { 753 unsigned int minor; 754 int ret; 755 756 minor = iminor(file_inode(file)); 757 mutex_lock(&lp_mutex); 758 switch (cmd) { 759 case LPSETTIMEOUT_OLD: 760 if (!COMPAT_USE_64BIT_TIME) { 761 ret = lp_set_timeout32(minor, (void __user *)arg); 762 break; 763 } 764 fallthrough; /* for x32 mode */ 765 case LPSETTIMEOUT_NEW: 766 ret = lp_set_timeout64(minor, (void __user *)arg); 767 break; 768 #ifdef LP_STATS 769 case LPGETSTATS: 770 /* FIXME: add an implementation if you set LP_STATS */ 771 ret = -EINVAL; 772 break; 773 #endif 774 default: 775 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 776 break; 777 } 778 mutex_unlock(&lp_mutex); 779 780 return ret; 781 } 782 #endif 783 784 static const struct file_operations lp_fops = { 785 .owner = THIS_MODULE, 786 .write = lp_write, 787 .unlocked_ioctl = lp_ioctl, 788 #ifdef CONFIG_COMPAT 789 .compat_ioctl = lp_compat_ioctl, 790 #endif 791 .open = lp_open, 792 .release = lp_release, 793 #ifdef CONFIG_PARPORT_1284 794 .read = lp_read, 795 #endif 796 .llseek = noop_llseek, 797 }; 798 799 /* --- support for console on the line printer ----------------- */ 800 801 #ifdef CONFIG_LP_CONSOLE 802 803 #define CONSOLE_LP 0 804 805 /* If the printer is out of paper, we can either lose the messages or 806 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 807 * non-zero to get the latter behaviour. */ 808 #define CONSOLE_LP_STRICT 1 809 810 /* The console must be locked when we get here. */ 811 812 static void lp_console_write(struct console *co, const char *s, 813 unsigned count) 814 { 815 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 816 struct parport *port = dev->port; 817 ssize_t written; 818 819 if (parport_claim(dev)) 820 /* Nothing we can do. */ 821 return; 822 823 parport_set_timeout(dev, 0); 824 825 /* Go to compatibility mode. */ 826 parport_negotiate(port, IEEE1284_MODE_COMPAT); 827 828 do { 829 /* Write the data, converting LF->CRLF as we go. */ 830 ssize_t canwrite = count; 831 char *lf = memchr(s, '\n', count); 832 if (lf) 833 canwrite = lf - s; 834 835 if (canwrite > 0) { 836 written = parport_write(port, s, canwrite); 837 838 if (written <= 0) 839 continue; 840 841 s += written; 842 count -= written; 843 canwrite -= written; 844 } 845 846 if (lf && canwrite <= 0) { 847 const char *crlf = "\r\n"; 848 int i = 2; 849 850 /* Dodge the original '\n', and put '\r\n' instead. */ 851 s++; 852 count--; 853 do { 854 written = parport_write(port, crlf, i); 855 if (written > 0) { 856 i -= written; 857 crlf += written; 858 } 859 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 860 } 861 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 862 863 parport_release(dev); 864 } 865 866 static struct console lpcons = { 867 .name = "lp", 868 .write = lp_console_write, 869 .flags = CON_PRINTBUFFER, 870 }; 871 872 #endif /* console on line printer */ 873 874 /* --- initialisation code ------------------------------------- */ 875 876 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 877 static char *parport[LP_NO]; 878 static bool reset; 879 880 module_param_array(parport, charp, NULL, 0); 881 module_param(reset, bool, 0); 882 883 #ifndef MODULE 884 static int __init lp_setup(char *str) 885 { 886 static int parport_ptr; 887 int x; 888 889 if (get_option(&str, &x)) { 890 if (x == 0) { 891 /* disable driver on "lp=" or "lp=0" */ 892 parport_nr[0] = LP_PARPORT_OFF; 893 } else { 894 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 895 return 0; 896 } 897 } else if (!strncmp(str, "parport", 7)) { 898 int n = simple_strtoul(str+7, NULL, 10); 899 if (parport_ptr < LP_NO) 900 parport_nr[parport_ptr++] = n; 901 else 902 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 903 str); 904 } else if (!strcmp(str, "auto")) { 905 parport_nr[0] = LP_PARPORT_AUTO; 906 } else if (!strcmp(str, "none")) { 907 if (parport_ptr < LP_NO) 908 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 909 else 910 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 911 str); 912 } else if (!strcmp(str, "reset")) { 913 reset = true; 914 } 915 return 1; 916 } 917 #endif 918 919 static int lp_register(int nr, struct parport *port) 920 { 921 struct pardev_cb ppdev_cb; 922 923 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 924 ppdev_cb.preempt = lp_preempt; 925 ppdev_cb.private = &lp_table[nr]; 926 lp_table[nr].dev = parport_register_dev_model(port, "lp", 927 &ppdev_cb, nr); 928 if (lp_table[nr].dev == NULL) 929 return 1; 930 lp_table[nr].flags |= LP_EXIST; 931 932 if (reset) 933 lp_reset(nr); 934 935 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 936 "lp%d", nr); 937 938 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 939 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 940 941 #ifdef CONFIG_LP_CONSOLE 942 if (!nr) { 943 if (port->modes & PARPORT_MODE_SAFEININT) { 944 register_console(&lpcons); 945 console_registered = port; 946 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 947 } else 948 printk(KERN_ERR "lp%d: cannot run console on %s\n", 949 CONSOLE_LP, port->name); 950 } 951 #endif 952 port_num[nr] = port->number; 953 954 return 0; 955 } 956 957 static void lp_attach(struct parport *port) 958 { 959 unsigned int i; 960 961 switch (parport_nr[0]) { 962 case LP_PARPORT_UNSPEC: 963 case LP_PARPORT_AUTO: 964 if (parport_nr[0] == LP_PARPORT_AUTO && 965 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 966 return; 967 if (lp_count == LP_NO) { 968 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 969 return; 970 } 971 for (i = 0; i < LP_NO; i++) 972 if (port_num[i] == -1) 973 break; 974 975 if (!lp_register(i, port)) 976 lp_count++; 977 break; 978 979 default: 980 for (i = 0; i < LP_NO; i++) { 981 if (port->number == parport_nr[i]) { 982 if (!lp_register(i, port)) 983 lp_count++; 984 break; 985 } 986 } 987 break; 988 } 989 } 990 991 static void lp_detach(struct parport *port) 992 { 993 int n; 994 995 /* Write this some day. */ 996 #ifdef CONFIG_LP_CONSOLE 997 if (console_registered == port) { 998 unregister_console(&lpcons); 999 console_registered = NULL; 1000 } 1001 #endif /* CONFIG_LP_CONSOLE */ 1002 1003 for (n = 0; n < LP_NO; n++) { 1004 if (port_num[n] == port->number) { 1005 port_num[n] = -1; 1006 lp_count--; 1007 device_destroy(lp_class, MKDEV(LP_MAJOR, n)); 1008 parport_unregister_device(lp_table[n].dev); 1009 } 1010 } 1011 } 1012 1013 static struct parport_driver lp_driver = { 1014 .name = "lp", 1015 .match_port = lp_attach, 1016 .detach = lp_detach, 1017 .devmodel = true, 1018 }; 1019 1020 static int __init lp_init(void) 1021 { 1022 int i, err; 1023 1024 if (parport_nr[0] == LP_PARPORT_OFF) 1025 return 0; 1026 1027 for (i = 0; i < LP_NO; i++) { 1028 lp_table[i].dev = NULL; 1029 lp_table[i].flags = 0; 1030 lp_table[i].chars = LP_INIT_CHAR; 1031 lp_table[i].time = LP_INIT_TIME; 1032 lp_table[i].wait = LP_INIT_WAIT; 1033 lp_table[i].lp_buffer = NULL; 1034 #ifdef LP_STATS 1035 lp_table[i].lastcall = 0; 1036 lp_table[i].runchars = 0; 1037 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats)); 1038 #endif 1039 lp_table[i].last_error = 0; 1040 init_waitqueue_head(&lp_table[i].waitq); 1041 init_waitqueue_head(&lp_table[i].dataq); 1042 mutex_init(&lp_table[i].port_mutex); 1043 lp_table[i].timeout = 10 * HZ; 1044 port_num[i] = -1; 1045 } 1046 1047 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) { 1048 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 1049 return -EIO; 1050 } 1051 1052 lp_class = class_create("printer"); 1053 if (IS_ERR(lp_class)) { 1054 err = PTR_ERR(lp_class); 1055 goto out_reg; 1056 } 1057 1058 if (parport_register_driver(&lp_driver)) { 1059 printk(KERN_ERR "lp: unable to register with parport\n"); 1060 err = -EIO; 1061 goto out_class; 1062 } 1063 1064 if (!lp_count) { 1065 printk(KERN_INFO "lp: driver loaded but no devices found\n"); 1066 #ifndef CONFIG_PARPORT_1284 1067 if (parport_nr[0] == LP_PARPORT_AUTO) 1068 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 1069 #endif 1070 } 1071 1072 return 0; 1073 1074 out_class: 1075 class_destroy(lp_class); 1076 out_reg: 1077 unregister_chrdev(LP_MAJOR, "lp"); 1078 return err; 1079 } 1080 1081 static int __init lp_init_module(void) 1082 { 1083 if (parport[0]) { 1084 /* The user gave some parameters. Let's see what they were. */ 1085 if (!strncmp(parport[0], "auto", 4)) 1086 parport_nr[0] = LP_PARPORT_AUTO; 1087 else { 1088 int n; 1089 for (n = 0; n < LP_NO && parport[n]; n++) { 1090 if (!strncmp(parport[n], "none", 4)) 1091 parport_nr[n] = LP_PARPORT_NONE; 1092 else { 1093 char *ep; 1094 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1095 if (ep != parport[n]) 1096 parport_nr[n] = r; 1097 else { 1098 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1099 return -ENODEV; 1100 } 1101 } 1102 } 1103 } 1104 } 1105 1106 return lp_init(); 1107 } 1108 1109 static void lp_cleanup_module(void) 1110 { 1111 parport_unregister_driver(&lp_driver); 1112 1113 #ifdef CONFIG_LP_CONSOLE 1114 unregister_console(&lpcons); 1115 #endif 1116 1117 unregister_chrdev(LP_MAJOR, "lp"); 1118 class_destroy(lp_class); 1119 } 1120 1121 __setup("lp=", lp_setup); 1122 module_init(lp_init_module); 1123 module_exit(lp_cleanup_module); 1124 1125 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1126 MODULE_LICENSE("GPL"); 1127