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/signal.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 <linux/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 static int port_num[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) 228 lp_release_parport(&lp_table[minor]); 229 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 230 schedule_timeout(LP_TIMEOUT_POLLED); 231 finish_wait(&lp_table[minor].waitq, &wait); 232 if (polling) 233 lp_claim_parport_or_block(&lp_table[minor]); 234 else 235 parport_yield_blocking(lp_table[minor].dev); 236 } 237 238 static int lp_check_status(int minor) 239 { 240 int error = 0; 241 unsigned int last = lp_table[minor].last_error; 242 unsigned char status = r_str(minor); 243 if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL)) 244 /* No error. */ 245 last = 0; 246 else if ((status & LP_POUTPA)) { 247 if (last != LP_POUTPA) { 248 last = LP_POUTPA; 249 printk(KERN_INFO "lp%d out of paper\n", minor); 250 } 251 error = -ENOSPC; 252 } else if (!(status & LP_PSELECD)) { 253 if (last != LP_PSELECD) { 254 last = LP_PSELECD; 255 printk(KERN_INFO "lp%d off-line\n", minor); 256 } 257 error = -EIO; 258 } else if (!(status & LP_PERRORP)) { 259 if (last != LP_PERRORP) { 260 last = LP_PERRORP; 261 printk(KERN_INFO "lp%d on fire\n", minor); 262 } 263 error = -EIO; 264 } else { 265 last = 0; /* Come here if LP_CAREFUL is set and no 266 errors are reported. */ 267 } 268 269 lp_table[minor].last_error = last; 270 271 if (last != 0) 272 lp_error(minor); 273 274 return error; 275 } 276 277 static int lp_wait_ready(int minor, int nonblock) 278 { 279 int error = 0; 280 281 /* If we're not in compatibility mode, we're ready now! */ 282 if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) { 283 return 0; 284 } 285 286 do { 287 error = lp_check_status(minor); 288 if (error && (nonblock || (LP_F(minor) & LP_ABORT))) 289 break; 290 if (signal_pending(current)) { 291 error = -EINTR; 292 break; 293 } 294 } while (error); 295 return error; 296 } 297 298 static ssize_t lp_write(struct file *file, const char __user *buf, 299 size_t count, loff_t *ppos) 300 { 301 unsigned int minor = iminor(file_inode(file)); 302 struct parport *port = lp_table[minor].dev->port; 303 char *kbuf = lp_table[minor].lp_buffer; 304 ssize_t retv = 0; 305 ssize_t written; 306 size_t copy_size = count; 307 int nonblock = ((file->f_flags & O_NONBLOCK) || 308 (LP_F(minor) & LP_ABORT)); 309 310 #ifdef LP_STATS 311 if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor))) 312 lp_table[minor].runchars = 0; 313 314 lp_table[minor].lastcall = jiffies; 315 #endif 316 317 /* Need to copy the data from user-space. */ 318 if (copy_size > LP_BUFFER_SIZE) 319 copy_size = LP_BUFFER_SIZE; 320 321 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 322 return -EINTR; 323 324 if (copy_from_user(kbuf, buf, copy_size)) { 325 retv = -EFAULT; 326 goto out_unlock; 327 } 328 329 /* Claim Parport or sleep until it becomes available 330 */ 331 lp_claim_parport_or_block(&lp_table[minor]); 332 /* Go to the proper mode. */ 333 lp_table[minor].current_mode = lp_negotiate(port, 334 lp_table[minor].best_mode); 335 336 parport_set_timeout(lp_table[minor].dev, 337 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 338 : lp_table[minor].timeout)); 339 340 if ((retv = lp_wait_ready(minor, nonblock)) == 0) 341 do { 342 /* Write the data. */ 343 written = parport_write(port, kbuf, copy_size); 344 if (written > 0) { 345 copy_size -= written; 346 count -= written; 347 buf += written; 348 retv += written; 349 } 350 351 if (signal_pending(current)) { 352 if (retv == 0) 353 retv = -EINTR; 354 355 break; 356 } 357 358 if (copy_size > 0) { 359 /* incomplete write -> check error ! */ 360 int error; 361 362 parport_negotiate(lp_table[minor].dev->port, 363 IEEE1284_MODE_COMPAT); 364 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 365 366 error = lp_wait_ready(minor, nonblock); 367 368 if (error) { 369 if (retv == 0) 370 retv = error; 371 break; 372 } else if (nonblock) { 373 if (retv == 0) 374 retv = -EAGAIN; 375 break; 376 } 377 378 parport_yield_blocking(lp_table[minor].dev); 379 lp_table[minor].current_mode 380 = lp_negotiate(port, 381 lp_table[minor].best_mode); 382 383 } else if (need_resched()) 384 schedule(); 385 386 if (count) { 387 copy_size = count; 388 if (copy_size > LP_BUFFER_SIZE) 389 copy_size = LP_BUFFER_SIZE; 390 391 if (copy_from_user(kbuf, buf, copy_size)) { 392 if (retv == 0) 393 retv = -EFAULT; 394 break; 395 } 396 } 397 } while (count > 0); 398 399 if (test_and_clear_bit(LP_PREEMPT_REQUEST, 400 &lp_table[minor].bits)) { 401 printk(KERN_INFO "lp%d releasing parport\n", minor); 402 parport_negotiate(lp_table[minor].dev->port, 403 IEEE1284_MODE_COMPAT); 404 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 405 lp_release_parport(&lp_table[minor]); 406 } 407 out_unlock: 408 mutex_unlock(&lp_table[minor].port_mutex); 409 410 return retv; 411 } 412 413 #ifdef CONFIG_PARPORT_1284 414 415 /* Status readback conforming to ieee1284 */ 416 static ssize_t lp_read(struct file *file, char __user *buf, 417 size_t count, loff_t *ppos) 418 { 419 DEFINE_WAIT(wait); 420 unsigned int minor=iminor(file_inode(file)); 421 struct parport *port = lp_table[minor].dev->port; 422 ssize_t retval = 0; 423 char *kbuf = lp_table[minor].lp_buffer; 424 int nonblock = ((file->f_flags & O_NONBLOCK) || 425 (LP_F(minor) & LP_ABORT)); 426 427 if (count > LP_BUFFER_SIZE) 428 count = LP_BUFFER_SIZE; 429 430 if (mutex_lock_interruptible(&lp_table[minor].port_mutex)) 431 return -EINTR; 432 433 lp_claim_parport_or_block(&lp_table[minor]); 434 435 parport_set_timeout(lp_table[minor].dev, 436 (nonblock ? PARPORT_INACTIVITY_O_NONBLOCK 437 : lp_table[minor].timeout)); 438 439 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 440 if (parport_negotiate(lp_table[minor].dev->port, 441 IEEE1284_MODE_NIBBLE)) { 442 retval = -EIO; 443 goto out; 444 } 445 446 while (retval == 0) { 447 retval = parport_read(port, kbuf, count); 448 449 if (retval > 0) 450 break; 451 452 if (nonblock) { 453 retval = -EAGAIN; 454 break; 455 } 456 457 /* Wait for data. */ 458 459 if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) { 460 parport_negotiate(lp_table[minor].dev->port, 461 IEEE1284_MODE_COMPAT); 462 lp_error(minor); 463 if (parport_negotiate(lp_table[minor].dev->port, 464 IEEE1284_MODE_NIBBLE)) { 465 retval = -EIO; 466 goto out; 467 } 468 } else { 469 prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE); 470 schedule_timeout(LP_TIMEOUT_POLLED); 471 finish_wait(&lp_table[minor].waitq, &wait); 472 } 473 474 if (signal_pending(current)) { 475 retval = -ERESTARTSYS; 476 break; 477 } 478 479 cond_resched(); 480 } 481 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 482 out: 483 lp_release_parport(&lp_table[minor]); 484 485 if (retval > 0 && copy_to_user(buf, kbuf, retval)) 486 retval = -EFAULT; 487 488 mutex_unlock(&lp_table[minor].port_mutex); 489 490 return retval; 491 } 492 493 #endif /* IEEE 1284 support */ 494 495 static int lp_open(struct inode *inode, struct file *file) 496 { 497 unsigned int minor = iminor(inode); 498 int ret = 0; 499 500 mutex_lock(&lp_mutex); 501 if (minor >= LP_NO) { 502 ret = -ENXIO; 503 goto out; 504 } 505 if ((LP_F(minor) & LP_EXIST) == 0) { 506 ret = -ENXIO; 507 goto out; 508 } 509 if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) { 510 ret = -EBUSY; 511 goto out; 512 } 513 /* If ABORTOPEN is set and the printer is offline or out of paper, 514 we may still want to open it to perform ioctl()s. Therefore we 515 have commandeered O_NONBLOCK, even though it is being used in 516 a non-standard manner. This is strictly a Linux hack, and 517 should most likely only ever be used by the tunelp application. */ 518 if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) { 519 int status; 520 lp_claim_parport_or_block(&lp_table[minor]); 521 status = r_str(minor); 522 lp_release_parport(&lp_table[minor]); 523 if (status & LP_POUTPA) { 524 printk(KERN_INFO "lp%d out of paper\n", minor); 525 LP_F(minor) &= ~LP_BUSY; 526 ret = -ENOSPC; 527 goto out; 528 } else if (!(status & LP_PSELECD)) { 529 printk(KERN_INFO "lp%d off-line\n", minor); 530 LP_F(minor) &= ~LP_BUSY; 531 ret = -EIO; 532 goto out; 533 } else if (!(status & LP_PERRORP)) { 534 printk(KERN_ERR "lp%d printer error\n", minor); 535 LP_F(minor) &= ~LP_BUSY; 536 ret = -EIO; 537 goto out; 538 } 539 } 540 lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL); 541 if (!lp_table[minor].lp_buffer) { 542 LP_F(minor) &= ~LP_BUSY; 543 ret = -ENOMEM; 544 goto out; 545 } 546 /* Determine if the peripheral supports ECP mode */ 547 lp_claim_parport_or_block(&lp_table[minor]); 548 if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) && 549 !parport_negotiate(lp_table[minor].dev->port, 550 IEEE1284_MODE_ECP)) { 551 printk(KERN_INFO "lp%d: ECP mode\n", minor); 552 lp_table[minor].best_mode = IEEE1284_MODE_ECP; 553 } else { 554 lp_table[minor].best_mode = IEEE1284_MODE_COMPAT; 555 } 556 /* Leave peripheral in compatibility mode */ 557 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 558 lp_release_parport(&lp_table[minor]); 559 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 560 out: 561 mutex_unlock(&lp_mutex); 562 return ret; 563 } 564 565 static int lp_release(struct inode *inode, struct file *file) 566 { 567 unsigned int minor = iminor(inode); 568 569 lp_claim_parport_or_block(&lp_table[minor]); 570 parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT); 571 lp_table[minor].current_mode = IEEE1284_MODE_COMPAT; 572 lp_release_parport(&lp_table[minor]); 573 kfree(lp_table[minor].lp_buffer); 574 lp_table[minor].lp_buffer = NULL; 575 LP_F(minor) &= ~LP_BUSY; 576 return 0; 577 } 578 579 static int lp_do_ioctl(unsigned int minor, unsigned int cmd, 580 unsigned long arg, void __user *argp) 581 { 582 int status; 583 int retval = 0; 584 585 #ifdef LP_DEBUG 586 printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg); 587 #endif 588 if (minor >= LP_NO) 589 return -ENODEV; 590 if ((LP_F(minor) & LP_EXIST) == 0) 591 return -ENODEV; 592 switch ( cmd ) { 593 case LPTIME: 594 if (arg > UINT_MAX / HZ) 595 return -EINVAL; 596 LP_TIME(minor) = arg * HZ/100; 597 break; 598 case LPCHAR: 599 LP_CHAR(minor) = arg; 600 break; 601 case LPABORT: 602 if (arg) 603 LP_F(minor) |= LP_ABORT; 604 else 605 LP_F(minor) &= ~LP_ABORT; 606 break; 607 case LPABORTOPEN: 608 if (arg) 609 LP_F(minor) |= LP_ABORTOPEN; 610 else 611 LP_F(minor) &= ~LP_ABORTOPEN; 612 break; 613 case LPCAREFUL: 614 if (arg) 615 LP_F(minor) |= LP_CAREFUL; 616 else 617 LP_F(minor) &= ~LP_CAREFUL; 618 break; 619 case LPWAIT: 620 LP_WAIT(minor) = arg; 621 break; 622 case LPSETIRQ: 623 return -EINVAL; 624 break; 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 return lp_set_timeout(minor, karg[0], karg[1]); 716 } 717 718 static long lp_ioctl(struct file *file, unsigned int cmd, 719 unsigned long arg) 720 { 721 unsigned int minor; 722 int ret; 723 724 minor = iminor(file_inode(file)); 725 mutex_lock(&lp_mutex); 726 switch (cmd) { 727 case LPSETTIMEOUT_OLD: 728 if (BITS_PER_LONG == 32) { 729 ret = lp_set_timeout32(minor, (void __user *)arg); 730 break; 731 } 732 /* fallthrough for 64-bit */ 733 case LPSETTIMEOUT_NEW: 734 ret = lp_set_timeout64(minor, (void __user *)arg); 735 break; 736 default: 737 ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); 738 break; 739 } 740 mutex_unlock(&lp_mutex); 741 742 return ret; 743 } 744 745 #ifdef CONFIG_COMPAT 746 static long lp_compat_ioctl(struct file *file, unsigned int cmd, 747 unsigned long arg) 748 { 749 unsigned int minor; 750 int ret; 751 752 minor = iminor(file_inode(file)); 753 mutex_lock(&lp_mutex); 754 switch (cmd) { 755 case LPSETTIMEOUT_OLD: 756 if (!COMPAT_USE_64BIT_TIME) { 757 ret = lp_set_timeout32(minor, (void __user *)arg); 758 break; 759 } 760 /* fallthrough for x32 mode */ 761 case LPSETTIMEOUT_NEW: 762 ret = lp_set_timeout64(minor, (void __user *)arg); 763 break; 764 #ifdef LP_STATS 765 case LPGETSTATS: 766 /* FIXME: add an implementation if you set LP_STATS */ 767 ret = -EINVAL; 768 break; 769 #endif 770 default: 771 ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg)); 772 break; 773 } 774 mutex_unlock(&lp_mutex); 775 776 return ret; 777 } 778 #endif 779 780 static const struct file_operations lp_fops = { 781 .owner = THIS_MODULE, 782 .write = lp_write, 783 .unlocked_ioctl = lp_ioctl, 784 #ifdef CONFIG_COMPAT 785 .compat_ioctl = lp_compat_ioctl, 786 #endif 787 .open = lp_open, 788 .release = lp_release, 789 #ifdef CONFIG_PARPORT_1284 790 .read = lp_read, 791 #endif 792 .llseek = noop_llseek, 793 }; 794 795 /* --- support for console on the line printer ----------------- */ 796 797 #ifdef CONFIG_LP_CONSOLE 798 799 #define CONSOLE_LP 0 800 801 /* If the printer is out of paper, we can either lose the messages or 802 * stall until the printer is happy again. Define CONSOLE_LP_STRICT 803 * non-zero to get the latter behaviour. */ 804 #define CONSOLE_LP_STRICT 1 805 806 /* The console must be locked when we get here. */ 807 808 static void lp_console_write(struct console *co, const char *s, 809 unsigned count) 810 { 811 struct pardevice *dev = lp_table[CONSOLE_LP].dev; 812 struct parport *port = dev->port; 813 ssize_t written; 814 815 if (parport_claim(dev)) 816 /* Nothing we can do. */ 817 return; 818 819 parport_set_timeout(dev, 0); 820 821 /* Go to compatibility mode. */ 822 parport_negotiate(port, IEEE1284_MODE_COMPAT); 823 824 do { 825 /* Write the data, converting LF->CRLF as we go. */ 826 ssize_t canwrite = count; 827 char *lf = memchr(s, '\n', count); 828 if (lf) 829 canwrite = lf - s; 830 831 if (canwrite > 0) { 832 written = parport_write(port, s, canwrite); 833 834 if (written <= 0) 835 continue; 836 837 s += written; 838 count -= written; 839 canwrite -= written; 840 } 841 842 if (lf && canwrite <= 0) { 843 const char *crlf = "\r\n"; 844 int i = 2; 845 846 /* Dodge the original '\n', and put '\r\n' instead. */ 847 s++; 848 count--; 849 do { 850 written = parport_write(port, crlf, i); 851 if (written > 0) 852 i -= written, crlf += written; 853 } while (i > 0 && (CONSOLE_LP_STRICT || written > 0)); 854 } 855 } while (count > 0 && (CONSOLE_LP_STRICT || written > 0)); 856 857 parport_release(dev); 858 } 859 860 static struct console lpcons = { 861 .name = "lp", 862 .write = lp_console_write, 863 .flags = CON_PRINTBUFFER, 864 }; 865 866 #endif /* console on line printer */ 867 868 /* --- initialisation code ------------------------------------- */ 869 870 static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC }; 871 static char *parport[LP_NO]; 872 static bool reset; 873 874 module_param_array(parport, charp, NULL, 0); 875 module_param(reset, bool, 0); 876 877 #ifndef MODULE 878 static int __init lp_setup(char *str) 879 { 880 static int parport_ptr; 881 int x; 882 883 if (get_option(&str, &x)) { 884 if (x == 0) { 885 /* disable driver on "lp=" or "lp=0" */ 886 parport_nr[0] = LP_PARPORT_OFF; 887 } else { 888 printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x); 889 return 0; 890 } 891 } else if (!strncmp(str, "parport", 7)) { 892 int n = simple_strtoul(str+7, NULL, 10); 893 if (parport_ptr < LP_NO) 894 parport_nr[parport_ptr++] = n; 895 else 896 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 897 str); 898 } else if (!strcmp(str, "auto")) { 899 parport_nr[0] = LP_PARPORT_AUTO; 900 } else if (!strcmp(str, "none")) { 901 if (parport_ptr < LP_NO) 902 parport_nr[parport_ptr++] = LP_PARPORT_NONE; 903 else 904 printk(KERN_INFO "lp: too many ports, %s ignored.\n", 905 str); 906 } else if (!strcmp(str, "reset")) { 907 reset = true; 908 } 909 return 1; 910 } 911 #endif 912 913 static int lp_register(int nr, struct parport *port) 914 { 915 struct pardev_cb ppdev_cb; 916 917 memset(&ppdev_cb, 0, sizeof(ppdev_cb)); 918 ppdev_cb.preempt = lp_preempt; 919 ppdev_cb.private = &lp_table[nr]; 920 lp_table[nr].dev = parport_register_dev_model(port, "lp", 921 &ppdev_cb, nr); 922 if (lp_table[nr].dev == NULL) 923 return 1; 924 lp_table[nr].flags |= LP_EXIST; 925 926 if (reset) 927 lp_reset(nr); 928 929 device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL, 930 "lp%d", nr); 931 932 printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name, 933 (port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); 934 935 #ifdef CONFIG_LP_CONSOLE 936 if (!nr) { 937 if (port->modes & PARPORT_MODE_SAFEININT) { 938 register_console(&lpcons); 939 console_registered = port; 940 printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP); 941 } else 942 printk(KERN_ERR "lp%d: cannot run console on %s\n", 943 CONSOLE_LP, port->name); 944 } 945 #endif 946 port_num[nr] = port->number; 947 948 return 0; 949 } 950 951 static void lp_attach(struct parport *port) 952 { 953 unsigned int i; 954 955 switch (parport_nr[0]) { 956 case LP_PARPORT_UNSPEC: 957 case LP_PARPORT_AUTO: 958 if (parport_nr[0] == LP_PARPORT_AUTO && 959 port->probe_info[0].class != PARPORT_CLASS_PRINTER) 960 return; 961 if (lp_count == LP_NO) { 962 printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO); 963 return; 964 } 965 for (i = 0; i < LP_NO; i++) 966 if (port_num[i] == -1) 967 break; 968 969 if (!lp_register(i, port)) 970 lp_count++; 971 break; 972 973 default: 974 for (i = 0; i < LP_NO; i++) { 975 if (port->number == parport_nr[i]) { 976 if (!lp_register(i, port)) 977 lp_count++; 978 break; 979 } 980 } 981 break; 982 } 983 } 984 985 static void lp_detach(struct parport *port) 986 { 987 int n; 988 989 /* Write this some day. */ 990 #ifdef CONFIG_LP_CONSOLE 991 if (console_registered == port) { 992 unregister_console(&lpcons); 993 console_registered = NULL; 994 } 995 #endif /* CONFIG_LP_CONSOLE */ 996 997 for (n = 0; n < LP_NO; n++) { 998 if (port_num[n] == port->number) { 999 port_num[n] = -1; 1000 lp_count--; 1001 device_destroy(lp_class, MKDEV(LP_MAJOR, n)); 1002 parport_unregister_device(lp_table[n].dev); 1003 } 1004 } 1005 } 1006 1007 static struct parport_driver lp_driver = { 1008 .name = "lp", 1009 .match_port = lp_attach, 1010 .detach = lp_detach, 1011 .devmodel = true, 1012 }; 1013 1014 static int __init lp_init(void) 1015 { 1016 int i, err = 0; 1017 1018 if (parport_nr[0] == LP_PARPORT_OFF) 1019 return 0; 1020 1021 for (i = 0; i < LP_NO; i++) { 1022 lp_table[i].dev = NULL; 1023 lp_table[i].flags = 0; 1024 lp_table[i].chars = LP_INIT_CHAR; 1025 lp_table[i].time = LP_INIT_TIME; 1026 lp_table[i].wait = LP_INIT_WAIT; 1027 lp_table[i].lp_buffer = NULL; 1028 #ifdef LP_STATS 1029 lp_table[i].lastcall = 0; 1030 lp_table[i].runchars = 0; 1031 memset(&lp_table[i].stats, 0, sizeof(struct lp_stats)); 1032 #endif 1033 lp_table[i].last_error = 0; 1034 init_waitqueue_head(&lp_table[i].waitq); 1035 init_waitqueue_head(&lp_table[i].dataq); 1036 mutex_init(&lp_table[i].port_mutex); 1037 lp_table[i].timeout = 10 * HZ; 1038 port_num[i] = -1; 1039 } 1040 1041 if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) { 1042 printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); 1043 return -EIO; 1044 } 1045 1046 lp_class = class_create(THIS_MODULE, "printer"); 1047 if (IS_ERR(lp_class)) { 1048 err = PTR_ERR(lp_class); 1049 goto out_reg; 1050 } 1051 1052 if (parport_register_driver(&lp_driver)) { 1053 printk(KERN_ERR "lp: unable to register with parport\n"); 1054 err = -EIO; 1055 goto out_class; 1056 } 1057 1058 if (!lp_count) { 1059 printk(KERN_INFO "lp: driver loaded but no devices found\n"); 1060 #ifndef CONFIG_PARPORT_1284 1061 if (parport_nr[0] == LP_PARPORT_AUTO) 1062 printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n"); 1063 #endif 1064 } 1065 1066 return 0; 1067 1068 out_class: 1069 class_destroy(lp_class); 1070 out_reg: 1071 unregister_chrdev(LP_MAJOR, "lp"); 1072 return err; 1073 } 1074 1075 static int __init lp_init_module(void) 1076 { 1077 if (parport[0]) { 1078 /* The user gave some parameters. Let's see what they were. */ 1079 if (!strncmp(parport[0], "auto", 4)) 1080 parport_nr[0] = LP_PARPORT_AUTO; 1081 else { 1082 int n; 1083 for (n = 0; n < LP_NO && parport[n]; n++) { 1084 if (!strncmp(parport[n], "none", 4)) 1085 parport_nr[n] = LP_PARPORT_NONE; 1086 else { 1087 char *ep; 1088 unsigned long r = simple_strtoul(parport[n], &ep, 0); 1089 if (ep != parport[n]) 1090 parport_nr[n] = r; 1091 else { 1092 printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]); 1093 return -ENODEV; 1094 } 1095 } 1096 } 1097 } 1098 } 1099 1100 return lp_init(); 1101 } 1102 1103 static void lp_cleanup_module(void) 1104 { 1105 parport_unregister_driver(&lp_driver); 1106 1107 #ifdef CONFIG_LP_CONSOLE 1108 unregister_console(&lpcons); 1109 #endif 1110 1111 unregister_chrdev(LP_MAJOR, "lp"); 1112 class_destroy(lp_class); 1113 } 1114 1115 __setup("lp=", lp_setup); 1116 module_init(lp_init_module); 1117 module_exit(lp_cleanup_module); 1118 1119 MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR); 1120 MODULE_LICENSE("GPL"); 1121