Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 | /*
* split in two parts for better support of different hardware
* by Joerg Dorchain (dorchain@mpi-sb.mpg.de)
*
* Amiga printer device by Michael Rausch (linux@uni-koblenz.de);
* Atari support added by Andreas Schwab (schwab@ls5.informatik.uni-dortmund.de);
* based upon work from
*
* Copyright (C) 1992 by Jim Weigand and Linus Torvalds
* Copyright (C) 1992,1993 by Michael K. Johnson
* - Thanks much to Gunter Windau for pointing out to me where the error
* checking ought to be.
* Copyright (C) 1993 by Nigel Gamble (added interrupt code)
*/
/* 01/17/95: Matthias Welwarsky (dg8y@rs11.hrz.th-darmstadt.de)
* lp_write(): rewritten from scratch
* lp_interrupt(): fixed cli()/sti()-bug
*
* 95/05/28: Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
* lp_write() fixed to make it work again.
* 95/08/18: Andreas Schwab
* lp_write_interrupt: fix race condition
*
* * CAUTION, please do check! *
*
* on 68000-based machines sti() must NEVER appear in interrupt driven
* code. The 68k-CPU has a priority-based interrupt scheme. while an interrupt
* with a certain priority is executed, all requests with lower or same
* priority get locked out. executing the sti()-macro allows ANY interrupt
* to be served. this really causes BIG trouble!
* to protect an interrupt driven routine against being interrupted
* (if absolutely needed!) one should use save_flags();cli()/restore_flags()!
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/init.h>
#include <asm/irq.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#ifdef CONFIG_AMIGA
#ifdef CONFIG_MULTIFACE_III_LP
#include <linux/lp_mfc.h>
#endif
#endif
#include <linux/lp_m68k.h>
#include <linux/lp_intern.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <asm/system.h>
/*
* why bother around with the pio driver when the interrupt works;
* so, for "security" reasons only, it's configurable here.
* saves some bytes, at least ...
*/
#define FORCE_POLLING 0
#define FORCE_INTERRUPT 1
/*
* PREFER_INTERRUPT doesn't make much sense on m68k.
* it is preserved here in case of joining with the i386 driver
*
#define PREFER_INTERRUPT 2
*/
#define WHICH_DRIVER FORCE_INTERRUPT
struct lp_struct *lp_table[MAX_LP] = {NULL,};
static int max_lp; /* the real number of devices */
/*
* All my debugging code assumes that you debug with only one printer at
* a time. RWWH
*/
#define LP_DEBUG
#undef LP_DEBUG
#if WHICH_DRIVER != FORCE_INTERRUPT
#ifdef LP_DEBUG
static int lp_max_count = 1;
#endif
static int lp_char_polled(char lpchar, int dev)
{
unsigned long count = 0;
do {
count ++;
if(need_resched)
schedule();
} while (lp_table[dev]->lp_is_busy(dev) && count < lp_table[dev]->chars);
if (count == lp_table[dev]->chars) {
return 0;
/* we timed out, and the character was /not/ printed */
}
#ifdef LP_DEBUG
if (count > lp_max_count) {
printk("lp success after %d counts.\n",count);
lp_max_count = count;
}
#endif
lp_table[dev]->lp_out(lpchar, dev);
return 1;
}
#endif
#ifdef LP_DEBUG
unsigned int lp_total_chars = 0;
unsigned int lp_last_call = 0;
#endif
#if WHICH_DRIVER != FORCE_POLLING
static __inline__ int lp_char_interrupt(char lpchar, int dev)
{
if (!lp_table[dev]->lp_is_busy(dev)) {
lp_table[dev]->lp_out(lpchar,dev);
return 1;
}
return 0;
}
static int lp_error;
void lp_interrupt(int dev)
{
if (dev >= 0 && dev < MAX_LP && lp_table[dev]->do_print)
{
if (lp_table[dev]->copy_size)
{
unsigned long flags;
save_flags(flags);
cli();
if (lp_char_interrupt(lp_table[dev]->lp_buffer[lp_table[dev]->bytes_written], dev)) {
--lp_table[dev]->copy_size;
++lp_table[dev]->bytes_written;
restore_flags(flags);
}
else
{
lp_table[dev]->do_print = 0;
restore_flags(flags);
lp_error = 1;
wake_up_interruptible(&lp_table[dev]->lp_wait_q);
}
}
else
{
lp_table[dev]->do_print = 0;
lp_error = 0;
wake_up_interruptible(&lp_table[dev]->lp_wait_q);
}
}
}
#if WHICH_DRIVER == FORCE_INTERRUPT
static long lp_write(struct inode *inode, struct file *file,
const char *buf, unsigned long count)
#else
static long lp_write_interrupt(struct inode *inode, struct file *file,
const char *buf, unsigned long count)
#endif
{
unsigned long total_bytes_written = 0;
unsigned int flags;
int rc;
int dev = MINOR(inode->i_rdev);
do {
lp_table[dev]->do_print = 0; /* disable lp_interrupt() */
lp_table[dev]->bytes_written = 0; /* init buffer read-pointer */
lp_error = 0;
lp_table[dev]->copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
copy_from_user(lp_table[dev]->lp_buffer, buf, lp_table[dev]->copy_size);
while (lp_table[dev]->copy_size) {
save_flags(flags);
cli(); /* no interrupts now */
lp_table[dev]->do_print = 1; /* enable lp_interrupt() */
if (lp_char_interrupt(lp_table[dev]->lp_buffer[lp_table[dev]->bytes_written], dev)) {
++lp_table[dev]->bytes_written;
--lp_table[dev]->copy_size;
lp_error = 0;
} else { /* something went wrong */
lp_table[dev]->do_print = 0; /* disable lp_interrupt() */
lp_error = 1; /* printer caused error */
}
if (lp_error) {
/* something blocked printing, so we don't want to sleep too long,
in case we have to rekick the interrupt */
current->timeout = jiffies + LP_TIMEOUT_POLLED;
} else {
current->timeout = jiffies + LP_TIMEOUT_INTERRUPT;
}
interruptible_sleep_on(&lp_table[dev]->lp_wait_q);
restore_flags(flags);
/* we're up again and running. we first disable lp_interrupt(), then
check what happened meanwhile */
lp_table[dev]->do_print = 0;
rc = total_bytes_written + lp_table[dev]->bytes_written;
if (signal_pending(current)) {
if (rc)
return rc;
else
return -EINTR;
}
if (lp_error) {
/* an error has occurred, maybe in lp_interrupt().
figure out the type of error, exit on request or if nothing has
been printed at all. */
if (lp_table[dev]->lp_has_pout(dev)) {
printk(KERN_NOTICE "lp%d: paper-out\n",dev);
if (!rc) rc = -ENOSPC;
} else if (!lp_table[dev]->lp_is_online(dev)) {
printk(KERN_NOTICE "lp%d: off-line\n",dev);
if (!rc) rc = -EIO;
} else if (lp_table[dev]->lp_is_busy(dev)) {
printk(KERN_NOTICE "lp%d: on fire\n",dev);
if (!rc) rc = -EIO;
}
if (lp_table[dev]->flags & LP_ABORT)
return rc;
}
/* check if our buffer was completely printed, if not, most likely
an unsolved error blocks the printer. As we can`t do anything
against, we start all over again. Else we set the read-pointer
of the buffer and count the printed characters */
if (!lp_table[dev]->copy_size) {
total_bytes_written += lp_table[dev]->bytes_written;
buf += lp_table[dev]->bytes_written;
count -= lp_table[dev]->bytes_written;
}
}
} while (count > 0);
return total_bytes_written;
}
#else
void (*lp_interrupt)() = NULL;
#endif
#if WHICH_DRIVER != FORCE_INTERRUPT
#if WHICH_DRIVER == FORCE_POLLING
static long lp_write(struct inode *inode, struct file *file,
const char *buf, unsigned long count)
#else
static long lp_write_polled(struct inode *inode, struct file *file,
const char *buf, unsigned long count)
#endif
{
char *temp = buf;
int dev = MINOR(inode->i_rdev);
#ifdef LP_DEBUG
if (jiffies-lp_last_call > lp_table[dev]->time) {
lp_total_chars = 0;
lp_max_count = 1;
}
lp_last_call = jiffies;
#endif
temp = buf;
while (count > 0) {
if (lp_char_polled(get_user(temp), dev)) {
/* only update counting vars if character was printed */
count--; temp++;
#ifdef LP_DEBUG
lp_total_chars++;
#endif
} else { /* if printer timed out */
if (lp_table[dev]->lp_has_pout(dev)) {
printk(KERN_NOTICE "lp%d: out of paper\n",dev);
if (lp_table[dev]->flags & LP_ABORT)
return temp - buf ? temp-buf : -ENOSPC;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIMEOUT_POLLED;
schedule();
} else if (!lp_table[dev]->lp_is_online(dev)) {
printk(KERN_NOTICE "lp%d: off-line\n",dev);
if (lp_table[dev]->flags & LP_ABORT)
return temp - buf ? temp-buf : -EIO;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIMEOUT_POLLED;
schedule();
} else
/* not offline or out of paper. on fire? */
if (lp_table[dev]->lp_is_busy(dev)) {
printk(KERN_NOTICE "lp%d: on fire\n",dev);
if (lp_table[dev]->flags & LP_ABORT)
return temp - buf ? temp-buf : -EFAULT;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIMEOUT_POLLED;
schedule();
}
/* check for signals before going to sleep */
if (signal_pending(current)) {
if (temp != buf)
return temp-buf;
else
return -EINTR;
}
#ifdef LP_DEBUG
printk("lp sleeping at %d characters for %d jiffies\n",
lp_total_chars, lp_table[dev]->time);
lp_total_chars = 0;
#endif
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + lp_table[dev]->time;
schedule();
}
}
return temp - buf;
}
#endif
unsigned int lp_irq = 0;
#if WHICH_DRIVER == PREFER_INTERRUPT
static long lp_write(struct inode *inode, struct file *file,
const char *buf, unsigned long count)
{
if (lp_irq)
return lp_write_interrupt(inode, file, buf, count);
else
return lp_write_polled(inode, file, buf, count);
}
#endif
static long long lp_lseek(struct file * file, long long offset, int origin)
{
return -ESPIPE;
}
static int lp_open(struct inode *inode, struct file *file)
{
int dev = MINOR(inode->i_rdev);
int ret;
if (dev >= MAX_LP)
return -ENODEV;
#ifdef CONFIG_KMOD
if (!lp_table[dev]) {
char modname[30];
sprintf(modname, "char-major-%d-%d", LP_MAJOR, dev);
request_module(modname);
}
#endif
if (!lp_table[dev])
return -ENODEV;
if (!(lp_table[dev]->flags & LP_EXIST))
return -ENODEV;
if (lp_table[dev]->flags & LP_BUSY)
return -EBUSY;
lp_table[dev]->flags |= LP_BUSY;
ret = lp_table[dev]->lp_open(dev);
if (ret != 0) {
lp_table[dev]->flags &= ~LP_BUSY;
}
else {
MOD_INC_USE_COUNT;
}
return ret;
}
static int lp_release(struct inode *inode, struct file *file)
{
int dev =MINOR(inode->i_rdev);
lp_table[dev]->flags &= ~LP_BUSY;
lp_table[dev]->lp_release(dev);
MOD_DEC_USE_COUNT;
return 0;
}
static int lp_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
unsigned int minor = MINOR(inode->i_rdev);
int retval = 0;
#ifdef LP_DEBUG
printk("lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);
#endif
if (minor >= max_lp)
return -ENODEV;
if (!(lp_table[minor]->flags & LP_EXIST))
return -ENODEV;
switch (cmd) {
case LPTIME:
lp_table[minor]->time = arg;
break;
case LPCHAR:
lp_table[minor]->chars = arg;
break;
case LPABORT:
if (arg)
lp_table[minor]->flags |= LP_ABORT;
else
lp_table[minor]->flags &= ~LP_ABORT;
break;
case LPWAIT:
lp_table[minor]->wait = arg;
break;
case LPSETIRQ:
case LPGETIRQ:
retval = lp_irq;
break;
default:
if (lp_table[minor]->lp_ioctl)
retval = lp_table[minor]->lp_ioctl(minor, cmd, arg);
else
retval = -EINVAL;
}
return retval;
}
static struct file_operations lp_fops = {
lp_lseek,
NULL, /* lp_read */
lp_write,
NULL, /* lp_readdir */
NULL, /* lp_poll */
lp_ioctl,
NULL, /* lp_mmap */
lp_open,
lp_release
};
EXPORT_SYMBOL(lp_table);
EXPORT_SYMBOL(lp_irq);
EXPORT_SYMBOL(lp_interrupt);
EXPORT_SYMBOL(register_parallel);
EXPORT_SYMBOL(unregister_parallel);
__initfunc(int lp_init(void))
{
extern char m68k_debug_device[];
if (!strcmp( m68k_debug_device, "par" ))
return -EBUSY;
if (register_chrdev(LP_MAJOR,"lp", &lp_fops)) {
printk(KERN_ERR "unable to get major %d for line printer\n", LP_MAJOR);
return -ENXIO;
}
#if WHICH_DRIVER == FORCE_POLLING
lp_irq = 0;
printk(KERN_INFO "lp_init: lp using polling driver\n");
#else
lp_irq = 1;
printk(KERN_INFO "lp_init: lp using interrupt driver\n");
#endif
#ifndef MODULE
lp_internal_init();
#ifdef CONFIG_MULTIFACE_III_LP
lp_mfc_init();
#endif
#endif
return 0;
}
/*
* Currently we do not accept any lp-parameters, but that may change.
*/
__initfunc(void lp_setup(char *str, int *ints))
{
}
#ifdef MODULE
int init_module(void)
{
return lp_init();
}
void cleanup_module(void)
{
unregister_chrdev(LP_MAJOR, "lp");
}
#endif
/*
* (un-)register for hardware drivers
* tab is an inititalised lp_struct, dev the desired minor
* if dev < 0, let the driver choose the first free minor
* if sucessful return the minor, else -1
*/
int register_parallel(struct lp_struct *tab, int dev)
{
if (dev < 0) {
dev = 0;
while ((dev < MAX_LP) && (lp_table[dev] != NULL))
dev++;
}
if (dev > MAX_LP)
return -1;
if (lp_table[dev] != NULL)
return -1;
lp_table[dev] = tab;
printk(KERN_INFO "lp%d: %s at 0x%08lx\n", dev, tab->name, (long)tab->base);
return dev;
}
#ifdef CONFIG_MODULES
void unregister_parallel(int dev)
{
if ((dev < 0) || (dev > MAX_LP) || (lp_table[dev] == NULL))
printk(KERN_ERR "WARNING: unregister_parallel for non-existant device ignored!\n");
else
lp_table[dev] = NULL;
}
#endif
|