FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/lpt.c
1 /*-
2 * Copyright (c) 1990 William F. Jolitz, TeleMuse
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This software is a component of "386BSD" developed by
16 * William F. Jolitz, TeleMuse.
17 * 4. Neither the name of the developer nor the name "386BSD"
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
22 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
23 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
24 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
25 * NOT MAKE USE OF THIS WORK.
26 *
27 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
28 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
29 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
30 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
31 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
32 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
33 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
34 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 *
48 * from: unknown origin, 386BSD 0.1
49 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
50 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp
51 */
52
53 #include <sys/cdefs.h>
54 __FBSDID("$FreeBSD$");
55
56 /*
57 * Device Driver for AT parallel printer port
58 * Written by William Jolitz 12/18/90
59 */
60
61 /*
62 * Updated for ppbus by Nicolas Souchu
63 * [Mon Jul 28 1997]
64 */
65
66 #include "opt_lpt.h"
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/module.h>
71 #include <sys/bus.h>
72 #include <sys/conf.h>
73 #include <sys/kernel.h>
74 #include <sys/uio.h>
75 #include <sys/syslog.h>
76 #include <sys/malloc.h>
77
78 #include <machine/bus.h>
79 #include <machine/resource.h>
80 #include <sys/rman.h>
81
82 #include <dev/ppbus/lptio.h>
83 #include <dev/ppbus/ppbconf.h>
84 #include <dev/ppbus/ppb_1284.h>
85 #include <dev/ppbus/lpt.h>
86 #include "ppbus_if.h"
87 #include <dev/ppbus/ppbio.h>
88
89 #ifndef LPT_DEBUG
90 #define lprintf(args)
91 #else
92 #define lprintf(args) \
93 do { \
94 if (lptflag) \
95 printf args; \
96 } while (0)
97 static int volatile lptflag = 1;
98 #endif
99
100 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
101 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
102 #define LPTOUTMAX 1 /* maximal timeout 1 s */
103 #define LPPRI (PZERO+8)
104 #define BUFSIZE 1024
105 #define BUFSTATSIZE 32
106
107 #define LPTUNIT(s) ((s)&0x03)
108 #define LPTFLAGS(s) ((s)&0xfc)
109
110 struct lpt_data {
111
112 short sc_state;
113 /* default case: negative prime, negative ack, handshake strobe,
114 prime once */
115 u_char sc_control;
116 char sc_flags;
117 #define LP_POS_INIT 0x04 /* if we are a postive init signal */
118 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
119 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
120 #define LP_PRIMEOPEN 0x20 /* prime on every open */
121 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
122 #define LP_BYPASS 0x80 /* bypass printer ready checks */
123 void *sc_inbuf;
124 void *sc_statbuf;
125 short sc_xfercnt ;
126 char sc_primed;
127 char *sc_cp ;
128 u_short sc_irq ; /* IRQ status of port */
129 #define LP_HAS_IRQ 0x01 /* we have an irq available */
130 #define LP_USE_IRQ 0x02 /* we are using our irq */
131 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
132 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
133 u_char sc_backoff ; /* time to call lptout() again */
134
135 struct resource *intr_resource; /* interrupt resource */
136 void *intr_cookie; /* interrupt registration cookie */
137
138 };
139
140 #define LPT_NAME "lpt" /* our official name */
141
142 static timeout_t lptout;
143 static int lpt_port_test(device_t dev, u_char data, u_char mask);
144 static int lpt_detect(device_t dev);
145
146 #define DEVTOSOFTC(dev) \
147 ((struct lpt_data *)device_get_softc(dev))
148 #define UNITOSOFTC(unit) \
149 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit)))
150 #define UNITODEVICE(unit) \
151 (devclass_get_device(lpt_devclass, (unit)))
152
153 static void lptintr(device_t dev);
154 static void lpt_intr(void *arg); /* without spls */
155
156 static devclass_t lpt_devclass;
157
158
159 /* bits for state */
160 #define OPEN (1<<0) /* device is open */
161 #define ASLP (1<<1) /* awaiting draining of printer */
162 #define EERROR (1<<2) /* error was received from printer */
163 #define OBUSY (1<<3) /* printer is busy doing output */
164 #define LPTOUT (1<<4) /* timeout while not selected */
165 #define TOUT (1<<5) /* timeout while not selected */
166 #define LPTINIT (1<<6) /* waiting to initialize for open */
167 #define INTERRUPTED (1<<7) /* write call was interrupted */
168
169 #define HAVEBUS (1<<8) /* the driver owns the bus */
170
171
172 /* status masks to interrogate printer status */
173 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
174 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
175
176 /* Printer Ready condition - from lpa.c */
177 /* Only used in polling code */
178 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
179 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
180 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
181
182 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
183 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
184
185
186 static d_open_t lptopen;
187 static d_close_t lptclose;
188 static d_write_t lptwrite;
189 static d_read_t lptread;
190 static d_ioctl_t lptioctl;
191
192 static struct cdevsw lpt_cdevsw = {
193 .d_version = D_VERSION,
194 .d_flags = D_NEEDGIANT,
195 .d_open = lptopen,
196 .d_close = lptclose,
197 .d_read = lptread,
198 .d_write = lptwrite,
199 .d_ioctl = lptioctl,
200 .d_name = LPT_NAME,
201 };
202
203 static int
204 lpt_request_ppbus(device_t dev, int how)
205 {
206 device_t ppbus = device_get_parent(dev);
207 struct lpt_data *sc = DEVTOSOFTC(dev);
208 int error;
209
210 if (sc->sc_state & HAVEBUS)
211 return (0);
212
213 /* we have the bus only if the request succeded */
214 if ((error = ppb_request_bus(ppbus, dev, how)) == 0)
215 sc->sc_state |= HAVEBUS;
216
217 return (error);
218 }
219
220 static int
221 lpt_release_ppbus(device_t dev)
222 {
223 device_t ppbus = device_get_parent(dev);
224 struct lpt_data *sc = DEVTOSOFTC(dev);
225 int error = 0;
226
227 if ((error = ppb_release_bus(ppbus, dev)) == 0)
228 sc->sc_state &= ~HAVEBUS;
229
230 return (error);
231 }
232
233 /*
234 * Internal routine to lptprobe to do port tests of one byte value
235 */
236 static int
237 lpt_port_test(device_t ppbus, u_char data, u_char mask)
238 {
239 int temp, timeout;
240
241 data = data & mask;
242 ppb_wdtr(ppbus, data);
243 timeout = 10000;
244 do {
245 DELAY(10);
246 temp = ppb_rdtr(ppbus) & mask;
247 }
248 while (temp != data && --timeout);
249 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
250 return (temp == data);
251 }
252
253 /*
254 * Probe simplified by replacing multiple loops with a hardcoded
255 * test pattern - 1999/02/08 des@freebsd.org
256 *
257 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
258 * Based partially on Rod Grimes' printer probe
259 *
260 * Logic:
261 * 1) If no port address was given, use the bios detected ports
262 * and autodetect what ports the printers are on.
263 * 2) Otherwise, probe the data port at the address given,
264 * using the method in Rod Grimes' port probe.
265 * (Much code ripped off directly from Rod's probe.)
266 *
267 * Comments from Rod's probe:
268 * Logic:
269 * 1) You should be able to write to and read back the same value
270 * to the data port. Do an alternating zeros, alternating ones,
271 * walking zero, and walking one test to check for stuck bits.
272 *
273 * 2) You should be able to write to and read back the same value
274 * to the control port lower 5 bits, the upper 3 bits are reserved
275 * per the IBM PC technical reference manauls and different boards
276 * do different things with them. Do an alternating zeros, alternating
277 * ones, walking zero, and walking one test to check for stuck bits.
278 *
279 * Some printers drag the strobe line down when the are powered off
280 * so this bit has been masked out of the control port test.
281 *
282 * XXX Some printers may not like a fast pulse on init or strobe, I
283 * don't know at this point, if that becomes a problem these bits
284 * should be turned off in the mask byte for the control port test.
285 *
286 * We are finally left with a mask of 0x14, due to some printers
287 * being adamant about holding other bits high ........
288 *
289 * Before probing the control port, we write a 0 to the data port -
290 * If not, some printers chuck out garbage when the strobe line
291 * gets toggled.
292 *
293 * 3) Set the data and control ports to a value of 0
294 *
295 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
296 * Epson FX-1170 and C.Itoh 8510RM
297 * printers.
298 * Quick exit on fail added.
299 */
300 static int
301 lpt_detect(device_t dev)
302 {
303 device_t ppbus = device_get_parent(dev);
304
305 static u_char testbyte[18] = {
306 0x55, /* alternating zeros */
307 0xaa, /* alternating ones */
308 0xfe, 0xfd, 0xfb, 0xf7,
309 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
310 0x01, 0x02, 0x04, 0x08,
311 0x10, 0x20, 0x40, 0x80 /* walking one */
312 };
313 int i, error, status;
314
315 status = 1; /* assume success */
316
317 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
318 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
319 status = 0;
320 goto end_probe;
321 }
322
323 for (i = 0; i < 18 && status; i++)
324 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
325 status = 0;
326 goto end_probe;
327 }
328
329 end_probe:
330 /* write 0's to control and data ports */
331 ppb_wdtr(ppbus, 0);
332 ppb_wctr(ppbus, 0);
333
334 lpt_release_ppbus(dev);
335
336 return (status);
337 }
338
339 static void
340 lpt_identify(driver_t *driver, device_t parent)
341 {
342
343 device_t dev;
344
345 dev = device_find_child(parent, LPT_NAME, -1);
346 if (!dev)
347 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1);
348 }
349
350 /*
351 * lpt_probe()
352 */
353 static int
354 lpt_probe(device_t dev)
355 {
356
357 if (!lpt_detect(dev))
358 return (ENXIO);
359
360 device_set_desc(dev, "Printer");
361
362 return (0);
363 }
364
365 static int
366 lpt_attach(device_t dev)
367 {
368 device_t ppbus = device_get_parent(dev);
369 struct lpt_data *sc = DEVTOSOFTC(dev);
370 int zero = 0, unit = device_get_unit(dev);
371 int error;
372 intptr_t irq;
373
374 sc->sc_primed = 0; /* not primed yet */
375
376 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
377 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
378 return (0);
379 }
380
381 ppb_wctr(ppbus, LPC_NINIT);
382
383 /* check if we can use interrupt, should be done by ppc stuff */
384 lprintf(("oldirq %x\n", sc->sc_irq));
385
386 /* retrieve the ppbus irq */
387 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
388
389 if (irq > 0) {
390 /* declare our interrupt handler */
391 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
392 &zero, irq, irq, 1, RF_SHAREABLE);
393 }
394 if (sc->intr_resource) {
395 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
396 device_printf(dev, "Interrupt-driven port\n");
397 } else {
398 sc->sc_irq = 0;
399 device_printf(dev, "Polled port\n");
400 }
401 lprintf(("irq %x %x\n", (int)irq, sc->sc_irq));
402
403 lpt_release_ppbus(dev);
404
405 make_dev(&lpt_cdevsw, unit,
406 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
407 make_dev(&lpt_cdevsw, unit | LP_BYPASS,
408 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
409 return (0);
410 }
411
412 static int
413 lpt_detach(device_t dev)
414 {
415 struct lpt_data *sc = DEVTOSOFTC(dev);
416
417 lpt_release_ppbus(dev);
418 if (sc->intr_resource != 0) {
419 BUS_TEARDOWN_INTR(device_get_parent(dev), dev,
420 sc->intr_resource, sc->intr_cookie);
421 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intr_resource);
422 }
423
424 return (0);
425 }
426
427 static void
428 lptout(void *arg)
429 {
430 device_t dev = (device_t)arg;
431 struct lpt_data *sc = DEVTOSOFTC(dev);
432 #ifdef LPT_DEBUG
433 device_t ppbus = device_get_parent(dev);
434 #endif
435
436 lprintf(("T %x ", ppb_rstr(ppbus)));
437 if (sc->sc_state & OPEN) {
438 sc->sc_backoff++;
439 if (sc->sc_backoff > hz/LPTOUTMAX)
440 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
441 timeout(lptout, (caddr_t)dev, sc->sc_backoff);
442 } else
443 sc->sc_state &= ~TOUT;
444
445 if (sc->sc_state & EERROR)
446 sc->sc_state &= ~EERROR;
447
448 /*
449 * Avoid possible hangs due to missed interrupts
450 */
451 if (sc->sc_xfercnt) {
452 lptintr(dev);
453 } else {
454 sc->sc_state &= ~OBUSY;
455 wakeup(dev);
456 }
457 }
458
459 /*
460 * lptopen -- reset the printer, then wait until it's selected and not busy.
461 * If LP_BYPASS flag is selected, then we do not try to select the
462 * printer -- this is just used for passing ioctls.
463 */
464
465 static int
466 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
467 {
468 int s;
469 int trys, err;
470 u_int unit = LPTUNIT(minor(dev));
471 struct lpt_data *sc = UNITOSOFTC(unit);
472 device_t lptdev = UNITODEVICE(unit);
473 device_t ppbus = device_get_parent(lptdev);
474
475 if (!sc)
476 return (ENXIO);
477
478 if (sc->sc_state) {
479 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
480 return(EBUSY);
481 } else
482 sc->sc_state |= LPTINIT;
483
484 sc->sc_flags = LPTFLAGS(minor(dev));
485
486 /* Check for open with BYPASS flag set. */
487 if (sc->sc_flags & LP_BYPASS) {
488 sc->sc_state = OPEN;
489 return(0);
490 }
491
492 /* request the ppbus only if we don't have it already */
493 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
494 /* give it a chance to try later */
495 sc->sc_state = 0;
496 return (err);
497 }
498
499 s = spltty();
500 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
501
502 /* set IRQ status according to ENABLE_IRQ flag
503 */
504 if (sc->sc_irq & LP_ENABLE_IRQ)
505 sc->sc_irq |= LP_USE_IRQ;
506 else
507 sc->sc_irq &= ~LP_USE_IRQ;
508
509 /* init printer */
510 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
511 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
512 ppb_wctr(ppbus, 0);
513 sc->sc_primed++;
514 DELAY(500);
515 }
516 }
517
518 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
519
520 /* wait till ready (printer running diagnostics) */
521 trys = 0;
522 do {
523 /* ran out of waiting for the printer */
524 if (trys++ >= LPINITRDY*4) {
525 splx(s);
526 sc->sc_state = 0;
527 lprintf(("status %x\n", ppb_rstr(ppbus)));
528
529 lpt_release_ppbus(lptdev);
530 return (EBUSY);
531 }
532
533 /* wait 1/4 second, give up if we get a signal */
534 if (tsleep(lptdev, LPPRI|PCATCH, "lptinit", hz/4) !=
535 EWOULDBLOCK) {
536 sc->sc_state = 0;
537 splx(s);
538
539 lpt_release_ppbus(lptdev);
540 return (EBUSY);
541 }
542
543 /* is printer online and ready for output */
544 } while ((ppb_rstr(ppbus) &
545 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
546 (LPS_SEL|LPS_NBSY|LPS_NERR));
547
548 sc->sc_control = LPC_SEL|LPC_NINIT;
549 if (sc->sc_flags & LP_AUTOLF)
550 sc->sc_control |= LPC_AUTOL;
551
552 /* enable interrupt if interrupt-driven */
553 if (sc->sc_irq & LP_USE_IRQ)
554 sc->sc_control |= LPC_ENA;
555
556 ppb_wctr(ppbus, sc->sc_control);
557
558 sc->sc_state = OPEN;
559 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
560 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK);
561 sc->sc_xfercnt = 0;
562 splx(s);
563
564 /* release the ppbus */
565 lpt_release_ppbus(lptdev);
566
567 /* only use timeout if using interrupt */
568 lprintf(("irq %x\n", sc->sc_irq));
569 if (sc->sc_irq & LP_USE_IRQ) {
570 sc->sc_state |= TOUT;
571 timeout(lptout, (caddr_t)lptdev,
572 (sc->sc_backoff = hz/LPTOUTINITIAL));
573 }
574
575 lprintf(("opened.\n"));
576 return(0);
577 }
578
579 /*
580 * lptclose -- close the device, free the local line buffer.
581 *
582 * Check for interrupted write call added.
583 */
584
585 static int
586 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td)
587 {
588 u_int unit = LPTUNIT(minor(dev));
589 struct lpt_data *sc = UNITOSOFTC(unit);
590 device_t lptdev = UNITODEVICE(unit);
591 device_t ppbus = device_get_parent(lptdev);
592 int err;
593
594 if(sc->sc_flags & LP_BYPASS)
595 goto end_close;
596
597 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
598 return (err);
599
600 sc->sc_state &= ~OPEN;
601
602 /* if the last write was interrupted, don't complete it */
603 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
604 while ((ppb_rstr(ppbus) &
605 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
606 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
607 /* wait 1/4 second, give up if we get a signal */
608 if (tsleep(lptdev, LPPRI|PCATCH,
609 "lpclose", hz) != EWOULDBLOCK)
610 break;
611
612 ppb_wctr(ppbus, LPC_NINIT);
613 free(sc->sc_inbuf, M_DEVBUF);
614 free(sc->sc_statbuf, M_DEVBUF);
615
616 end_close:
617 /* release the bus anyway
618 * unregistration of interrupt forced by release
619 */
620 lpt_release_ppbus(lptdev);
621
622 sc->sc_state = 0;
623 sc->sc_xfercnt = 0;
624 lprintf(("closed.\n"));
625 return(0);
626 }
627
628 /*
629 * lpt_pushbytes()
630 * Workhorse for actually spinning and writing bytes to printer
631 * Derived from lpa.c
632 * Originally by ?
633 *
634 * This code is only used when we are polling the port
635 */
636 static int
637 lpt_pushbytes(device_t dev)
638 {
639 struct lpt_data *sc = DEVTOSOFTC(dev);
640 device_t ppbus = device_get_parent(dev);
641 int spin, err, tic;
642 char ch;
643
644 lprintf(("p"));
645 /* loop for every character .. */
646 while (sc->sc_xfercnt > 0) {
647 /* printer data */
648 ch = *(sc->sc_cp);
649 sc->sc_cp++;
650 sc->sc_xfercnt--;
651
652 /*
653 * Wait for printer ready.
654 * Loop 20 usecs testing BUSY bit, then sleep
655 * for exponentially increasing timeout. (vak)
656 */
657 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
658 DELAY(1); /* XXX delay is NOT this accurate! */
659 if (spin >= MAX_SPIN) {
660 tic = 0;
661 while (NOT_READY(ppbus)) {
662 /*
663 * Now sleep, every cycle a
664 * little longer ..
665 */
666 tic = tic + tic + 1;
667 /*
668 * But no more than 10 seconds. (vak)
669 */
670 if (tic > MAX_SLEEP)
671 tic = MAX_SLEEP;
672 err = tsleep(dev, LPPRI,
673 LPT_NAME "poll", tic);
674 if (err != EWOULDBLOCK) {
675 return (err);
676 }
677 }
678 }
679
680 /* output data */
681 ppb_wdtr(ppbus, ch);
682 /* strobe */
683 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
684 ppb_wctr(ppbus, sc->sc_control);
685
686 }
687 return(0);
688 }
689
690 /*
691 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
692 */
693
694 static int
695 lptread(struct cdev *dev, struct uio *uio, int ioflag)
696 {
697 u_int unit = LPTUNIT(minor(dev));
698 struct lpt_data *sc = UNITOSOFTC(unit);
699 device_t lptdev = UNITODEVICE(unit);
700 device_t ppbus = device_get_parent(lptdev);
701 int error = 0, len;
702
703 if (sc->sc_flags & LP_BYPASS) {
704 /* we can't do reads in bypass mode */
705 return (EPERM);
706 }
707
708 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0)))
709 return (error);
710
711 /* read data in an other buffer, read/write may be simultaneous */
712 len = 0;
713 while (uio->uio_resid) {
714 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
715 sc->sc_statbuf, min(BUFSTATSIZE,
716 uio->uio_resid), &len))) {
717 goto error;
718 }
719
720 if (!len)
721 goto error; /* no more data */
722
723 if ((error = uiomove(sc->sc_statbuf, len, uio)))
724 goto error;
725 }
726
727 error:
728 ppb_1284_terminate(ppbus);
729 return (error);
730 }
731
732 /*
733 * lptwrite --copy a line from user space to a local buffer, then call
734 * putc to get the chars moved to the output queue.
735 *
736 * Flagging of interrupted write added.
737 */
738
739 static int
740 lptwrite(struct cdev *dev, struct uio *uio, int ioflag)
741 {
742 register unsigned n;
743 int err;
744 u_int unit = LPTUNIT(minor(dev));
745 struct lpt_data *sc = UNITOSOFTC(unit);
746 device_t lptdev = UNITODEVICE(unit);
747 device_t ppbus = device_get_parent(lptdev);
748
749 if(sc->sc_flags & LP_BYPASS) {
750 /* we can't do writes in bypass mode */
751 return(EPERM);
752 }
753
754 /* request the ppbus only if we don't have it already */
755 /* XXX interrupt registration?! */
756 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
757 return (err);
758
759 /* if interrupts are working, register the handler */
760 if (sc->sc_irq & LP_USE_IRQ) {
761 /* register our interrupt handler */
762 err = bus_setup_intr(lptdev, sc->intr_resource,
763 INTR_TYPE_TTY, NULL, lpt_intr, lptdev,
764 &sc->intr_cookie);
765 if (err) {
766 device_printf(lptdev, "handler registration failed, polled mode.\n");
767 sc->sc_irq &= ~LP_USE_IRQ;
768 }
769 }
770
771 sc->sc_state &= ~INTERRUPTED;
772 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
773 sc->sc_cp = sc->sc_inbuf;
774 uiomove(sc->sc_cp, n, uio);
775 sc->sc_xfercnt = n ;
776
777 if (sc->sc_irq & LP_ENABLE_EXT) {
778 /* try any extended mode */
779 err = ppb_write(ppbus, sc->sc_cp,
780 sc->sc_xfercnt, 0);
781 switch (err) {
782 case 0:
783 /* if not all data was sent, we could rely
784 * on polling for the last bytes */
785 sc->sc_xfercnt = 0;
786 break;
787 case EINTR:
788 sc->sc_state |= INTERRUPTED;
789 return(err);
790 case EINVAL:
791 /* advanced mode not avail */
792 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
793 break;
794 default:
795 return(err);
796 }
797 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
798 lprintf(("i"));
799 /* if the printer is ready for a char, */
800 /* give it one */
801 if ((sc->sc_state & OBUSY) == 0){
802 lprintf(("\nC %d. ", sc->sc_xfercnt));
803 lptintr(lptdev);
804 }
805 lprintf(("W "));
806 if (sc->sc_state & OBUSY)
807 if ((err = tsleep(lptdev,
808 LPPRI|PCATCH, LPT_NAME "write", 0))) {
809 sc->sc_state |= INTERRUPTED;
810 return(err);
811 }
812 }
813
814 /* check to see if we must do a polled write */
815 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
816 lprintf(("p"));
817
818 err = lpt_pushbytes(lptdev);
819
820 if (err)
821 return(err);
822 }
823 }
824
825 /* we have not been interrupted, release the ppbus */
826 lpt_release_ppbus(lptdev);
827
828 return(0);
829 }
830
831 /*
832 * lpt_intr -- handle printer interrupts which occur when the printer is
833 * ready to accept another char.
834 *
835 * do checking for interrupted write call.
836 */
837
838 static void
839 lpt_intr(void *arg)
840 {
841 device_t lptdev = (device_t)arg;
842 device_t ppbus = device_get_parent(lptdev);
843 struct lpt_data *sc = DEVTOSOFTC(lptdev);
844 int sts = 0;
845 int i;
846
847 /* we must own the bus to use it */
848 if ((sc->sc_state & HAVEBUS) == 0)
849 return;
850
851 /*
852 * Is printer online and ready for output?
853 *
854 * Avoid falling back to lptout() too quickly. First spin-loop
855 * to see if the printer will become ready ``really soon now''.
856 */
857 for (i = 0; i < 100 &&
858 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
859
860 if ((sts & RDY_MASK) == LP_READY) {
861 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
862 sc->sc_backoff = hz/LPTOUTINITIAL;
863
864 if (sc->sc_xfercnt) {
865 /* send char */
866 /*lprintf(("%x ", *sc->sc_cp)); */
867 ppb_wdtr(ppbus, *sc->sc_cp++) ;
868 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
869 /* DELAY(X) */
870 ppb_wctr(ppbus, sc->sc_control);
871
872 /* any more data for printer */
873 if(--(sc->sc_xfercnt) > 0) return;
874 }
875
876 /*
877 * No more data waiting for printer.
878 * Wakeup is not done if write call was not interrupted.
879 */
880 sc->sc_state &= ~OBUSY;
881
882 if(!(sc->sc_state & INTERRUPTED))
883 wakeup(lptdev);
884 lprintf(("w "));
885 return;
886 } else { /* check for error */
887 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
888 (sc->sc_state & OPEN))
889 sc->sc_state |= EERROR;
890 /* lptout() will jump in and try to restart. */
891 }
892 lprintf(("sts %x ", sts));
893 }
894
895 static void
896 lptintr(device_t dev)
897 {
898 /* call the interrupt at required spl level */
899 int s = spltty();
900
901 lpt_intr(dev);
902
903 splx(s);
904 return;
905 }
906
907 static int
908 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
909 {
910 int error = 0;
911 u_int unit = LPTUNIT(minor(dev));
912 struct lpt_data *sc = UNITOSOFTC(unit);
913 u_char old_sc_irq; /* old printer IRQ status */
914
915 switch (cmd) {
916 case LPT_IRQ :
917 if(sc->sc_irq & LP_HAS_IRQ) {
918 /*
919 * NOTE:
920 * If the IRQ status is changed,
921 * this will only be visible on the
922 * next open.
923 *
924 * If interrupt status changes,
925 * this gets syslog'd.
926 */
927 old_sc_irq = sc->sc_irq;
928 switch(*(int*)data) {
929 case 0:
930 sc->sc_irq &= (~LP_ENABLE_IRQ);
931 break;
932 case 1:
933 sc->sc_irq &= (~LP_ENABLE_EXT);
934 sc->sc_irq |= LP_ENABLE_IRQ;
935 break;
936 case 2:
937 /* classic irq based transfer and advanced
938 * modes are in conflict
939 */
940 sc->sc_irq &= (~LP_ENABLE_IRQ);
941 sc->sc_irq |= LP_ENABLE_EXT;
942 break;
943 case 3:
944 sc->sc_irq &= (~LP_ENABLE_EXT);
945 break;
946 default:
947 break;
948 }
949
950 if (old_sc_irq != sc->sc_irq )
951 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
952 unit,
953 (sc->sc_irq & LP_ENABLE_IRQ)?
954 "interrupt-driven":"polled",
955 (sc->sc_irq & LP_ENABLE_EXT)?
956 "extended":"standard");
957 } else /* polled port */
958 error = EOPNOTSUPP;
959 break;
960 default:
961 error = ENODEV;
962 }
963
964 return(error);
965 }
966
967 static device_method_t lpt_methods[] = {
968 /* device interface */
969 DEVMETHOD(device_identify, lpt_identify),
970 DEVMETHOD(device_probe, lpt_probe),
971 DEVMETHOD(device_attach, lpt_attach),
972 DEVMETHOD(device_detach, lpt_detach),
973
974 { 0, 0 }
975 };
976
977 static driver_t lpt_driver = {
978 LPT_NAME,
979 lpt_methods,
980 sizeof(struct lpt_data),
981 };
982
983 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);
984 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);
Cache object: 24bdf0d76189cd2232f88e9a6edf86d5
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