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: releng/10.0/sys/dev/ppbus/lpt.c 227814 2011-11-22 11:35:24Z attilio $");
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 struct lpt_data {
108 device_t sc_dev;
109 struct cdev *sc_cdev;
110 struct cdev *sc_cdev_bypass;
111 short sc_state;
112 /* default case: negative prime, negative ack, handshake strobe,
113 prime once */
114 u_char sc_control;
115 char sc_flags;
116 #define LP_POS_INIT 0x04 /* if we are a postive init signal */
117 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
118 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
119 #define LP_PRIMEOPEN 0x20 /* prime on every open */
120 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
121 #define LP_BYPASS 0x80 /* bypass printer ready checks */
122 void *sc_inbuf;
123 void *sc_statbuf;
124 short sc_xfercnt ;
125 char sc_primed;
126 char *sc_cp ;
127 u_short sc_irq ; /* IRQ status of port */
128 #define LP_HAS_IRQ 0x01 /* we have an irq available */
129 #define LP_USE_IRQ 0x02 /* we are using our irq */
130 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
131 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
132 u_char sc_backoff ; /* time to call lptout() again */
133 struct callout sc_timer;
134
135 struct resource *sc_intr_resource; /* interrupt resource */
136 void *sc_intr_cookie; /* interrupt cookie */
137 };
138
139 #define LPT_NAME "lpt" /* our official name */
140
141 static timeout_t lptout;
142 static int lpt_port_test(device_t dev, u_char data, u_char mask);
143 static int lpt_detect(device_t dev);
144
145 #define DEVTOSOFTC(dev) \
146 ((struct lpt_data *)device_get_softc(dev))
147
148 static void lptintr(void *arg);
149
150 static devclass_t lpt_devclass;
151
152
153 /* bits for state */
154 #define OPEN (1<<0) /* device is open */
155 #define ASLP (1<<1) /* awaiting draining of printer */
156 #define EERROR (1<<2) /* error was received from printer */
157 #define OBUSY (1<<3) /* printer is busy doing output */
158 #define LPTOUT (1<<4) /* timeout while not selected */
159 #define TOUT (1<<5) /* timeout while not selected */
160 #define LPTINIT (1<<6) /* waiting to initialize for open */
161 #define INTERRUPTED (1<<7) /* write call was interrupted */
162 #define HAVEBUS (1<<8) /* the driver owns the bus */
163
164 /* status masks to interrogate printer status */
165 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
166 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
167
168 /* Printer Ready condition - from lpa.c */
169 /* Only used in polling code */
170 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
171 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
172 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
173
174 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
175 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
176
177
178 static d_open_t lptopen;
179 static d_close_t lptclose;
180 static d_write_t lptwrite;
181 static d_read_t lptread;
182 static d_ioctl_t lptioctl;
183
184 static struct cdevsw lpt_cdevsw = {
185 .d_version = D_VERSION,
186 .d_open = lptopen,
187 .d_close = lptclose,
188 .d_read = lptread,
189 .d_write = lptwrite,
190 .d_ioctl = lptioctl,
191 .d_name = LPT_NAME,
192 };
193
194 static int
195 lpt_request_ppbus(device_t dev, int how)
196 {
197 device_t ppbus = device_get_parent(dev);
198 struct lpt_data *sc = DEVTOSOFTC(dev);
199 int error;
200
201 /*
202 * We might already have the bus for a write(2) after an interrupted
203 * write(2) call.
204 */
205 ppb_assert_locked(ppbus);
206 if (sc->sc_state & HAVEBUS)
207 return (0);
208
209 error = ppb_request_bus(ppbus, dev, how);
210 if (error == 0)
211 sc->sc_state |= HAVEBUS;
212 return (error);
213 }
214
215 static int
216 lpt_release_ppbus(device_t dev)
217 {
218 device_t ppbus = device_get_parent(dev);
219 struct lpt_data *sc = DEVTOSOFTC(dev);
220 int error = 0;
221
222 ppb_assert_locked(ppbus);
223 if (sc->sc_state & HAVEBUS) {
224 error = ppb_release_bus(ppbus, dev);
225 if (error == 0)
226 sc->sc_state &= ~HAVEBUS;
227 }
228 return (error);
229 }
230
231 /*
232 * Internal routine to lptprobe to do port tests of one byte value
233 */
234 static int
235 lpt_port_test(device_t ppbus, u_char data, u_char mask)
236 {
237 int temp, timeout;
238
239 data = data & mask;
240 ppb_wdtr(ppbus, data);
241 timeout = 10000;
242 do {
243 DELAY(10);
244 temp = ppb_rdtr(ppbus) & mask;
245 }
246 while (temp != data && --timeout);
247 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
248 return (temp == data);
249 }
250
251 /*
252 * Probe simplified by replacing multiple loops with a hardcoded
253 * test pattern - 1999/02/08 des@freebsd.org
254 *
255 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
256 * Based partially on Rod Grimes' printer probe
257 *
258 * Logic:
259 * 1) If no port address was given, use the bios detected ports
260 * and autodetect what ports the printers are on.
261 * 2) Otherwise, probe the data port at the address given,
262 * using the method in Rod Grimes' port probe.
263 * (Much code ripped off directly from Rod's probe.)
264 *
265 * Comments from Rod's probe:
266 * Logic:
267 * 1) You should be able to write to and read back the same value
268 * to the data port. Do an alternating zeros, alternating ones,
269 * walking zero, and walking one test to check for stuck bits.
270 *
271 * 2) You should be able to write to and read back the same value
272 * to the control port lower 5 bits, the upper 3 bits are reserved
273 * per the IBM PC technical reference manauls and different boards
274 * do different things with them. Do an alternating zeros, alternating
275 * ones, walking zero, and walking one test to check for stuck bits.
276 *
277 * Some printers drag the strobe line down when the are powered off
278 * so this bit has been masked out of the control port test.
279 *
280 * XXX Some printers may not like a fast pulse on init or strobe, I
281 * don't know at this point, if that becomes a problem these bits
282 * should be turned off in the mask byte for the control port test.
283 *
284 * We are finally left with a mask of 0x14, due to some printers
285 * being adamant about holding other bits high ........
286 *
287 * Before probing the control port, we write a 0 to the data port -
288 * If not, some printers chuck out garbage when the strobe line
289 * gets toggled.
290 *
291 * 3) Set the data and control ports to a value of 0
292 *
293 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
294 * Epson FX-1170 and C.Itoh 8510RM
295 * printers.
296 * Quick exit on fail added.
297 */
298 static int
299 lpt_detect(device_t dev)
300 {
301 device_t ppbus = device_get_parent(dev);
302
303 static u_char testbyte[18] = {
304 0x55, /* alternating zeros */
305 0xaa, /* alternating ones */
306 0xfe, 0xfd, 0xfb, 0xf7,
307 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
308 0x01, 0x02, 0x04, 0x08,
309 0x10, 0x20, 0x40, 0x80 /* walking one */
310 };
311 int i, error, status;
312
313 status = 1; /* assume success */
314
315 ppb_lock(ppbus);
316 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
317 ppb_unlock(ppbus);
318 device_printf(dev, "cannot alloc ppbus (%d)!\n", error);
319 return (0);
320 }
321
322 for (i = 0; i < 18 && status; i++)
323 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
324 status = 0;
325 break;
326 }
327
328 /* write 0's to control and data ports */
329 ppb_wdtr(ppbus, 0);
330 ppb_wctr(ppbus, 0);
331
332 lpt_release_ppbus(dev);
333 ppb_unlock(ppbus);
334
335 return (status);
336 }
337
338 static void
339 lpt_identify(driver_t *driver, device_t parent)
340 {
341
342 device_t dev;
343
344 dev = device_find_child(parent, LPT_NAME, -1);
345 if (!dev)
346 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1);
347 }
348
349 /*
350 * lpt_probe()
351 */
352 static int
353 lpt_probe(device_t dev)
354 {
355
356 if (!lpt_detect(dev))
357 return (ENXIO);
358
359 device_set_desc(dev, "Printer");
360
361 return (0);
362 }
363
364 static int
365 lpt_attach(device_t dev)
366 {
367 device_t ppbus = device_get_parent(dev);
368 struct lpt_data *sc = DEVTOSOFTC(dev);
369 int rid = 0, unit = device_get_unit(dev);
370 int error;
371
372 sc->sc_primed = 0; /* not primed yet */
373 ppb_init_callout(ppbus, &sc->sc_timer, 0);
374
375 ppb_lock(ppbus);
376 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
377 ppb_unlock(ppbus);
378 device_printf(dev, "cannot alloc ppbus (%d)!\n", error);
379 return (0);
380 }
381
382 ppb_wctr(ppbus, LPC_NINIT);
383 lpt_release_ppbus(dev);
384 ppb_unlock(ppbus);
385
386 /* declare our interrupt handler */
387 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
388 RF_SHAREABLE);
389 if (sc->sc_intr_resource) {
390 error = bus_setup_intr(dev, sc->sc_intr_resource,
391 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc,
392 &sc->sc_intr_cookie);
393 if (error) {
394 bus_release_resource(dev, SYS_RES_IRQ, rid,
395 sc->sc_intr_resource);
396 device_printf(dev,
397 "Unable to register interrupt handler\n");
398 return (error);
399 }
400 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
401 device_printf(dev, "Interrupt-driven port\n");
402 } else {
403 sc->sc_irq = 0;
404 device_printf(dev, "Polled port\n");
405 }
406 lprintf(("irq %x\n", sc->sc_irq));
407
408 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
409 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK);
410 sc->sc_dev = dev;
411 sc->sc_cdev = make_dev(&lpt_cdevsw, unit,
412 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
413 sc->sc_cdev->si_drv1 = sc;
414 sc->sc_cdev->si_drv2 = 0;
415 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit,
416 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
417 sc->sc_cdev_bypass->si_drv1 = sc;
418 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS;
419 return (0);
420 }
421
422 static int
423 lpt_detach(device_t dev)
424 {
425 struct lpt_data *sc = DEVTOSOFTC(dev);
426 device_t ppbus = device_get_parent(dev);
427
428 destroy_dev(sc->sc_cdev);
429 destroy_dev(sc->sc_cdev_bypass);
430 ppb_lock(ppbus);
431 lpt_release_ppbus(dev);
432 ppb_unlock(ppbus);
433 callout_drain(&sc->sc_timer);
434 if (sc->sc_intr_resource != NULL) {
435 bus_teardown_intr(dev, sc->sc_intr_resource,
436 sc->sc_intr_cookie);
437 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource);
438 }
439 free(sc->sc_inbuf, M_DEVBUF);
440 free(sc->sc_statbuf, M_DEVBUF);
441
442 return (0);
443 }
444
445 static void
446 lptout(void *arg)
447 {
448 struct lpt_data *sc = arg;
449 device_t dev = sc->sc_dev;
450 device_t ppbus;
451
452 ppbus = device_get_parent(dev);
453 ppb_assert_locked(ppbus);
454 lprintf(("T %x ", ppb_rstr(ppbus)));
455 if (sc->sc_state & OPEN) {
456 sc->sc_backoff++;
457 if (sc->sc_backoff > hz/LPTOUTMAX)
458 sc->sc_backoff = hz/LPTOUTMAX;
459 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc);
460 } else
461 sc->sc_state &= ~TOUT;
462
463 if (sc->sc_state & EERROR)
464 sc->sc_state &= ~EERROR;
465
466 /*
467 * Avoid possible hangs due to missed interrupts
468 */
469 if (sc->sc_xfercnt) {
470 lptintr(sc);
471 } else {
472 sc->sc_state &= ~OBUSY;
473 wakeup(dev);
474 }
475 }
476
477 /*
478 * lptopen -- reset the printer, then wait until it's selected and not busy.
479 * If LP_BYPASS flag is selected, then we do not try to select the
480 * printer -- this is just used for passing ioctls.
481 */
482
483 static int
484 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
485 {
486 int trys, err;
487 struct lpt_data *sc = dev->si_drv1;
488 device_t lptdev;
489 device_t ppbus;
490
491 if (!sc)
492 return (ENXIO);
493
494 lptdev = sc->sc_dev;
495 ppbus = device_get_parent(lptdev);
496
497 ppb_lock(ppbus);
498 if (sc->sc_state) {
499 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev),
500 sc->sc_state));
501 ppb_unlock(ppbus);
502 return(EBUSY);
503 } else
504 sc->sc_state |= LPTINIT;
505
506 sc->sc_flags = (uintptr_t)dev->si_drv2;
507
508 /* Check for open with BYPASS flag set. */
509 if (sc->sc_flags & LP_BYPASS) {
510 sc->sc_state = OPEN;
511 ppb_unlock(ppbus);
512 return(0);
513 }
514
515 /* request the ppbus only if we don't have it already */
516 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
517 /* give it a chance to try later */
518 sc->sc_state = 0;
519 ppb_unlock(ppbus);
520 return (err);
521 }
522
523 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev),
524 sc->sc_flags));
525
526 /* set IRQ status according to ENABLE_IRQ flag
527 */
528 if (sc->sc_irq & LP_ENABLE_IRQ)
529 sc->sc_irq |= LP_USE_IRQ;
530 else
531 sc->sc_irq &= ~LP_USE_IRQ;
532
533 /* init printer */
534 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
535 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
536 ppb_wctr(ppbus, 0);
537 sc->sc_primed++;
538 DELAY(500);
539 }
540 }
541
542 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
543
544 /* wait till ready (printer running diagnostics) */
545 trys = 0;
546 do {
547 /* ran out of waiting for the printer */
548 if (trys++ >= LPINITRDY*4) {
549 lprintf(("status %x\n", ppb_rstr(ppbus)));
550
551 lpt_release_ppbus(lptdev);
552 sc->sc_state = 0;
553 ppb_unlock(ppbus);
554 return (EBUSY);
555 }
556
557 /* wait 1/4 second, give up if we get a signal */
558 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit",
559 hz / 4) != EWOULDBLOCK) {
560 lpt_release_ppbus(lptdev);
561 sc->sc_state = 0;
562 ppb_unlock(ppbus);
563 return (EBUSY);
564 }
565
566 /* is printer online and ready for output */
567 } while ((ppb_rstr(ppbus) &
568 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
569 (LPS_SEL|LPS_NBSY|LPS_NERR));
570
571 sc->sc_control = LPC_SEL|LPC_NINIT;
572 if (sc->sc_flags & LP_AUTOLF)
573 sc->sc_control |= LPC_AUTOL;
574
575 /* enable interrupt if interrupt-driven */
576 if (sc->sc_irq & LP_USE_IRQ)
577 sc->sc_control |= LPC_ENA;
578
579 ppb_wctr(ppbus, sc->sc_control);
580
581 sc->sc_state &= ~LPTINIT;
582 sc->sc_state |= OPEN;
583 sc->sc_xfercnt = 0;
584
585 /* only use timeout if using interrupt */
586 lprintf(("irq %x\n", sc->sc_irq));
587 if (sc->sc_irq & LP_USE_IRQ) {
588 sc->sc_state |= TOUT;
589 sc->sc_backoff = hz / LPTOUTINITIAL;
590 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc);
591 }
592
593 /* release the ppbus */
594 lpt_release_ppbus(lptdev);
595 ppb_unlock(ppbus);
596
597 lprintf(("opened.\n"));
598 return(0);
599 }
600
601 /*
602 * lptclose -- close the device, free the local line buffer.
603 *
604 * Check for interrupted write call added.
605 */
606
607 static int
608 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td)
609 {
610 struct lpt_data *sc = dev->si_drv1;
611 device_t lptdev = sc->sc_dev;
612 device_t ppbus = device_get_parent(lptdev);
613 int err;
614
615 ppb_lock(ppbus);
616 if (sc->sc_flags & LP_BYPASS)
617 goto end_close;
618
619 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
620 ppb_unlock(ppbus);
621 return (err);
622 }
623
624 /* if the last write was interrupted, don't complete it */
625 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
626 while ((ppb_rstr(ppbus) &
627 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
628 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
629 /* wait 1 second, give up if we get a signal */
630 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose",
631 hz) != EWOULDBLOCK)
632 break;
633
634 sc->sc_state &= ~OPEN;
635 callout_stop(&sc->sc_timer);
636 ppb_wctr(ppbus, LPC_NINIT);
637
638 /*
639 * unregistration of interrupt forced by release
640 */
641 lpt_release_ppbus(lptdev);
642
643 end_close:
644 sc->sc_state = 0;
645 sc->sc_xfercnt = 0;
646 ppb_unlock(ppbus);
647 lprintf(("closed.\n"));
648 return(0);
649 }
650
651 /*
652 * lpt_pushbytes()
653 * Workhorse for actually spinning and writing bytes to printer
654 * Derived from lpa.c
655 * Originally by ?
656 *
657 * This code is only used when we are polling the port
658 */
659 static int
660 lpt_pushbytes(struct lpt_data *sc)
661 {
662 device_t dev = sc->sc_dev;
663 device_t ppbus = device_get_parent(dev);
664 int spin, err, tic;
665 char ch;
666
667 ppb_assert_locked(ppbus);
668 lprintf(("p"));
669 /* loop for every character .. */
670 while (sc->sc_xfercnt > 0) {
671 /* printer data */
672 ch = *(sc->sc_cp);
673 sc->sc_cp++;
674 sc->sc_xfercnt--;
675
676 /*
677 * Wait for printer ready.
678 * Loop 20 usecs testing BUSY bit, then sleep
679 * for exponentially increasing timeout. (vak)
680 */
681 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
682 DELAY(1); /* XXX delay is NOT this accurate! */
683 if (spin >= MAX_SPIN) {
684 tic = 0;
685 while (NOT_READY(ppbus)) {
686 /*
687 * Now sleep, every cycle a
688 * little longer ..
689 */
690 tic = tic + tic + 1;
691 /*
692 * But no more than 10 seconds. (vak)
693 */
694 if (tic > MAX_SLEEP)
695 tic = MAX_SLEEP;
696 err = ppb_sleep(ppbus, dev, LPPRI,
697 LPT_NAME "poll", tic);
698 if (err != EWOULDBLOCK) {
699 return (err);
700 }
701 }
702 }
703
704 /* output data */
705 ppb_wdtr(ppbus, ch);
706 /* strobe */
707 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
708 ppb_wctr(ppbus, sc->sc_control);
709
710 }
711 return(0);
712 }
713
714 /*
715 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
716 */
717
718 static int
719 lptread(struct cdev *dev, struct uio *uio, int ioflag)
720 {
721 struct lpt_data *sc = dev->si_drv1;
722 device_t lptdev = sc->sc_dev;
723 device_t ppbus = device_get_parent(lptdev);
724 int error = 0, len;
725
726 if (sc->sc_flags & LP_BYPASS) {
727 /* we can't do reads in bypass mode */
728 return (EPERM);
729 }
730
731 ppb_lock(ppbus);
732 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) {
733 ppb_unlock(ppbus);
734 return (error);
735 }
736
737 /* read data in an other buffer, read/write may be simultaneous */
738 len = 0;
739 while (uio->uio_resid) {
740 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
741 sc->sc_statbuf, min(BUFSTATSIZE,
742 uio->uio_resid), &len))) {
743 goto error;
744 }
745
746 if (!len)
747 goto error; /* no more data */
748
749 ppb_unlock(ppbus);
750 error = uiomove(sc->sc_statbuf, len, uio);
751 ppb_lock(ppbus);
752 if (error)
753 goto error;
754 }
755
756 error:
757 ppb_1284_terminate(ppbus);
758 ppb_unlock(ppbus);
759 return (error);
760 }
761
762 /*
763 * lptwrite --copy a line from user space to a local buffer, then call
764 * putc to get the chars moved to the output queue.
765 *
766 * Flagging of interrupted write added.
767 */
768
769 static int
770 lptwrite(struct cdev *dev, struct uio *uio, int ioflag)
771 {
772 register unsigned n;
773 int err;
774 struct lpt_data *sc = dev->si_drv1;
775 device_t lptdev = sc->sc_dev;
776 device_t ppbus = device_get_parent(lptdev);
777
778 if (sc->sc_flags & LP_BYPASS) {
779 /* we can't do writes in bypass mode */
780 return (EPERM);
781 }
782
783 /* request the ppbus only if we don't have it already */
784 ppb_lock(ppbus);
785 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
786 ppb_unlock(ppbus);
787 return (err);
788 }
789
790 sc->sc_state &= ~INTERRUPTED;
791 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
792 sc->sc_cp = sc->sc_inbuf;
793 ppb_unlock(ppbus);
794 err = uiomove(sc->sc_cp, n, uio);
795 ppb_lock(ppbus);
796 if (err)
797 break;
798 sc->sc_xfercnt = n;
799
800 if (sc->sc_irq & LP_ENABLE_EXT) {
801 /* try any extended mode */
802 err = ppb_write(ppbus, sc->sc_cp,
803 sc->sc_xfercnt, 0);
804 switch (err) {
805 case 0:
806 /* if not all data was sent, we could rely
807 * on polling for the last bytes */
808 sc->sc_xfercnt = 0;
809 break;
810 case EINTR:
811 sc->sc_state |= INTERRUPTED;
812 ppb_unlock(ppbus);
813 return (err);
814 case EINVAL:
815 /* advanced mode not avail */
816 log(LOG_NOTICE,
817 "%s: advanced mode not avail, polling\n",
818 device_get_nameunit(sc->sc_dev));
819 break;
820 default:
821 ppb_unlock(ppbus);
822 return (err);
823 }
824 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
825 lprintf(("i"));
826 /* if the printer is ready for a char, */
827 /* give it one */
828 if ((sc->sc_state & OBUSY) == 0){
829 lprintf(("\nC %d. ", sc->sc_xfercnt));
830 lptintr(sc);
831 }
832 lprintf(("W "));
833 if (sc->sc_state & OBUSY)
834 if ((err = ppb_sleep(ppbus, lptdev,
835 LPPRI|PCATCH, LPT_NAME "write", 0))) {
836 sc->sc_state |= INTERRUPTED;
837 ppb_unlock(ppbus);
838 return(err);
839 }
840 }
841
842 /* check to see if we must do a polled write */
843 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
844 lprintf(("p"));
845
846 err = lpt_pushbytes(sc);
847
848 if (err) {
849 ppb_unlock(ppbus);
850 return (err);
851 }
852 }
853 }
854
855 /* we have not been interrupted, release the ppbus */
856 lpt_release_ppbus(lptdev);
857 ppb_unlock(ppbus);
858
859 return (err);
860 }
861
862 /*
863 * lptintr -- handle printer interrupts which occur when the printer is
864 * ready to accept another char.
865 *
866 * do checking for interrupted write call.
867 */
868 static void
869 lptintr(void *arg)
870 {
871 struct lpt_data *sc = arg;
872 device_t lptdev = sc->sc_dev;
873 device_t ppbus = device_get_parent(lptdev);
874 int sts = 0;
875 int i;
876
877 /*
878 * Is printer online and ready for output?
879 *
880 * Avoid falling back to lptout() too quickly. First spin-loop
881 * to see if the printer will become ready ``really soon now''.
882 */
883 for (i = 0; i < 100 &&
884 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
885
886 if ((sts & RDY_MASK) == LP_READY) {
887 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
888 sc->sc_backoff = hz / LPTOUTINITIAL;
889
890 if (sc->sc_xfercnt) {
891 /* send char */
892 /*lprintf(("%x ", *sc->sc_cp)); */
893 ppb_wdtr(ppbus, *sc->sc_cp++) ;
894 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
895 /* DELAY(X) */
896 ppb_wctr(ppbus, sc->sc_control);
897
898 /* any more data for printer */
899 if (--(sc->sc_xfercnt) > 0)
900 return;
901 }
902
903 /*
904 * No more data waiting for printer.
905 * Wakeup is not done if write call was not interrupted.
906 */
907 sc->sc_state &= ~OBUSY;
908
909 if (!(sc->sc_state & INTERRUPTED))
910 wakeup(lptdev);
911 lprintf(("w "));
912 return;
913 } else { /* check for error */
914 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
915 (sc->sc_state & OPEN))
916 sc->sc_state |= EERROR;
917 /* lptout() will jump in and try to restart. */
918 }
919 lprintf(("sts %x ", sts));
920 }
921
922 static int
923 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
924 {
925 int error = 0;
926 struct lpt_data *sc = dev->si_drv1;
927 device_t ppbus;
928 u_char old_sc_irq; /* old printer IRQ status */
929
930 switch (cmd) {
931 case LPT_IRQ :
932 ppbus = device_get_parent(sc->sc_dev);
933 ppb_lock(ppbus);
934 if (sc->sc_irq & LP_HAS_IRQ) {
935 /*
936 * NOTE:
937 * If the IRQ status is changed,
938 * this will only be visible on the
939 * next open.
940 *
941 * If interrupt status changes,
942 * this gets syslog'd.
943 */
944 old_sc_irq = sc->sc_irq;
945 switch (*(int*)data) {
946 case 0:
947 sc->sc_irq &= (~LP_ENABLE_IRQ);
948 break;
949 case 1:
950 sc->sc_irq &= (~LP_ENABLE_EXT);
951 sc->sc_irq |= LP_ENABLE_IRQ;
952 break;
953 case 2:
954 /* classic irq based transfer and advanced
955 * modes are in conflict
956 */
957 sc->sc_irq &= (~LP_ENABLE_IRQ);
958 sc->sc_irq |= LP_ENABLE_EXT;
959 break;
960 case 3:
961 sc->sc_irq &= (~LP_ENABLE_EXT);
962 break;
963 default:
964 break;
965 }
966
967 if (old_sc_irq != sc->sc_irq )
968 log(LOG_NOTICE, "%s: switched to %s %s mode\n",
969 device_get_nameunit(sc->sc_dev),
970 (sc->sc_irq & LP_ENABLE_IRQ)?
971 "interrupt-driven":"polled",
972 (sc->sc_irq & LP_ENABLE_EXT)?
973 "extended":"standard");
974 } else /* polled port */
975 error = EOPNOTSUPP;
976 ppb_unlock(ppbus);
977 break;
978 default:
979 error = ENODEV;
980 }
981
982 return(error);
983 }
984
985 static device_method_t lpt_methods[] = {
986 /* device interface */
987 DEVMETHOD(device_identify, lpt_identify),
988 DEVMETHOD(device_probe, lpt_probe),
989 DEVMETHOD(device_attach, lpt_attach),
990 DEVMETHOD(device_detach, lpt_detach),
991
992 { 0, 0 }
993 };
994
995 static driver_t lpt_driver = {
996 LPT_NAME,
997 lpt_methods,
998 sizeof(struct lpt_data),
999 };
1000
1001 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);
1002 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);
Cache object: d4063e3586b2131281388525fffeacd7
|