1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1990 William F. Jolitz, TeleMuse
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This software is a component of "386BSD" developed by
18 * William F. Jolitz, TeleMuse.
19 * 4. Neither the name of the developer nor the name "386BSD"
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
24 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
25 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
26 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
27 * NOT MAKE USE OF THIS WORK.
28 *
29 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
30 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
31 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
32 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
33 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
34 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
35 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
36 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
41 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 *
50 * from: unknown origin, 386BSD 0.1
51 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
52 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp
53 */
54
55 #include <sys/cdefs.h>
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 positive 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 callout_func_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 /* bits for state */
151 #define OPEN (1<<0) /* device is open */
152 #define ASLP (1<<1) /* awaiting draining of printer */
153 #define EERROR (1<<2) /* error was received from printer */
154 #define OBUSY (1<<3) /* printer is busy doing output */
155 #define LPTOUT (1<<4) /* timeout while not selected */
156 #define TOUT (1<<5) /* timeout while not selected */
157 #define LPTINIT (1<<6) /* waiting to initialize for open */
158 #define INTERRUPTED (1<<7) /* write call was interrupted */
159 #define HAVEBUS (1<<8) /* the driver owns the bus */
160
161 /* status masks to interrogate printer status */
162 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
163 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
164
165 /* Printer Ready condition - from lpa.c */
166 /* Only used in polling code */
167 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
168 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
169 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
170
171 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
172 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
173
174 static d_open_t lptopen;
175 static d_close_t lptclose;
176 static d_write_t lptwrite;
177 static d_read_t lptread;
178 static d_ioctl_t lptioctl;
179
180 static struct cdevsw lpt_cdevsw = {
181 .d_version = D_VERSION,
182 .d_open = lptopen,
183 .d_close = lptclose,
184 .d_read = lptread,
185 .d_write = lptwrite,
186 .d_ioctl = lptioctl,
187 .d_name = LPT_NAME,
188 };
189
190 static int
lpt_request_ppbus(device_t dev,int how)191 lpt_request_ppbus(device_t dev, int how)
192 {
193 device_t ppbus = device_get_parent(dev);
194 struct lpt_data *sc = DEVTOSOFTC(dev);
195 int error;
196
197 /*
198 * We might already have the bus for a write(2) after an interrupted
199 * write(2) call.
200 */
201 ppb_assert_locked(ppbus);
202 if (sc->sc_state & HAVEBUS)
203 return (0);
204
205 error = ppb_request_bus(ppbus, dev, how);
206 if (error == 0)
207 sc->sc_state |= HAVEBUS;
208 return (error);
209 }
210
211 static int
lpt_release_ppbus(device_t dev)212 lpt_release_ppbus(device_t dev)
213 {
214 device_t ppbus = device_get_parent(dev);
215 struct lpt_data *sc = DEVTOSOFTC(dev);
216 int error = 0;
217
218 ppb_assert_locked(ppbus);
219 if (sc->sc_state & HAVEBUS) {
220 error = ppb_release_bus(ppbus, dev);
221 if (error == 0)
222 sc->sc_state &= ~HAVEBUS;
223 }
224 return (error);
225 }
226
227 /*
228 * Internal routine to lptprobe to do port tests of one byte value
229 */
230 static int
lpt_port_test(device_t ppbus,u_char data,u_char mask)231 lpt_port_test(device_t ppbus, u_char data, u_char mask)
232 {
233 int temp, timeout;
234
235 data = data & mask;
236 ppb_wdtr(ppbus, data);
237 timeout = 10000;
238 do {
239 DELAY(10);
240 temp = ppb_rdtr(ppbus) & mask;
241 }
242 while (temp != data && --timeout);
243 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
244 return (temp == data);
245 }
246
247 /*
248 * Probe simplified by replacing multiple loops with a hardcoded
249 * test pattern - 1999/02/08 des@freebsd.org
250 *
251 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
252 * Based partially on Rod Grimes' printer probe
253 *
254 * Logic:
255 * 1) If no port address was given, use the bios detected ports
256 * and autodetect what ports the printers are on.
257 * 2) Otherwise, probe the data port at the address given,
258 * using the method in Rod Grimes' port probe.
259 * (Much code ripped off directly from Rod's probe.)
260 *
261 * Comments from Rod's probe:
262 * Logic:
263 * 1) You should be able to write to and read back the same value
264 * to the data port. Do an alternating zeros, alternating ones,
265 * walking zero, and walking one test to check for stuck bits.
266 *
267 * 2) You should be able to write to and read back the same value
268 * to the control port lower 5 bits, the upper 3 bits are reserved
269 * per the IBM PC technical reference manuals and different boards
270 * do different things with them. Do an alternating zeros, alternating
271 * ones, walking zero, and walking one test to check for stuck bits.
272 *
273 * Some printers drag the strobe line down when the are powered off
274 * so this bit has been masked out of the control port test.
275 *
276 * XXX Some printers may not like a fast pulse on init or strobe, I
277 * don't know at this point, if that becomes a problem these bits
278 * should be turned off in the mask byte for the control port test.
279 *
280 * We are finally left with a mask of 0x14, due to some printers
281 * being adamant about holding other bits high ........
282 *
283 * Before probing the control port, we write a 0 to the data port -
284 * If not, some printers chuck out garbage when the strobe line
285 * gets toggled.
286 *
287 * 3) Set the data and control ports to a value of 0
288 *
289 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
290 * Epson FX-1170 and C.Itoh 8510RM
291 * printers.
292 * Quick exit on fail added.
293 */
294 static int
lpt_detect(device_t dev)295 lpt_detect(device_t dev)
296 {
297 device_t ppbus = device_get_parent(dev);
298
299 static u_char testbyte[18] = {
300 0x55, /* alternating zeros */
301 0xaa, /* alternating ones */
302 0xfe, 0xfd, 0xfb, 0xf7,
303 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
304 0x01, 0x02, 0x04, 0x08,
305 0x10, 0x20, 0x40, 0x80 /* walking one */
306 };
307 int i, error, status;
308
309 status = 1; /* assume success */
310
311 ppb_lock(ppbus);
312 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
313 ppb_unlock(ppbus);
314 device_printf(dev, "cannot alloc ppbus (%d)!\n", error);
315 return (0);
316 }
317
318 for (i = 0; i < 18 && status; i++)
319 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
320 status = 0;
321 break;
322 }
323
324 /* write 0's to control and data ports */
325 ppb_wdtr(ppbus, 0);
326 ppb_wctr(ppbus, 0);
327
328 lpt_release_ppbus(dev);
329 ppb_unlock(ppbus);
330
331 return (status);
332 }
333
334 static void
lpt_identify(driver_t * driver,device_t parent)335 lpt_identify(driver_t *driver, device_t parent)
336 {
337
338 device_t dev;
339
340 dev = device_find_child(parent, LPT_NAME, -1);
341 if (!dev)
342 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1);
343 }
344
345 /*
346 * lpt_probe()
347 */
348 static int
lpt_probe(device_t dev)349 lpt_probe(device_t dev)
350 {
351
352 if (!lpt_detect(dev))
353 return (ENXIO);
354
355 device_set_desc(dev, "Printer");
356
357 return (0);
358 }
359
360 static int
lpt_attach(device_t dev)361 lpt_attach(device_t dev)
362 {
363 device_t ppbus = device_get_parent(dev);
364 struct lpt_data *sc = DEVTOSOFTC(dev);
365 int rid = 0, unit = device_get_unit(dev);
366 int error;
367
368 sc->sc_primed = 0; /* not primed yet */
369 ppb_init_callout(ppbus, &sc->sc_timer, 0);
370
371 ppb_lock(ppbus);
372 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
373 ppb_unlock(ppbus);
374 device_printf(dev, "cannot alloc ppbus (%d)!\n", error);
375 return (0);
376 }
377
378 ppb_wctr(ppbus, LPC_NINIT);
379 lpt_release_ppbus(dev);
380 ppb_unlock(ppbus);
381
382 /* declare our interrupt handler */
383 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
384 RF_SHAREABLE);
385 if (sc->sc_intr_resource) {
386 error = bus_setup_intr(dev, sc->sc_intr_resource,
387 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc,
388 &sc->sc_intr_cookie);
389 if (error) {
390 bus_release_resource(dev, SYS_RES_IRQ, rid,
391 sc->sc_intr_resource);
392 device_printf(dev,
393 "Unable to register interrupt handler\n");
394 return (error);
395 }
396 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
397 device_printf(dev, "Interrupt-driven port\n");
398 } else {
399 sc->sc_irq = 0;
400 device_printf(dev, "Polled port\n");
401 }
402 lprintf(("irq %x\n", sc->sc_irq));
403
404 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
405 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK);
406 sc->sc_dev = dev;
407 sc->sc_cdev = make_dev(&lpt_cdevsw, unit,
408 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
409 sc->sc_cdev->si_drv1 = sc;
410 sc->sc_cdev->si_drv2 = 0;
411 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit,
412 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
413 sc->sc_cdev_bypass->si_drv1 = sc;
414 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS;
415 return (0);
416 }
417
418 static int
lpt_detach(device_t dev)419 lpt_detach(device_t dev)
420 {
421 struct lpt_data *sc = DEVTOSOFTC(dev);
422 device_t ppbus = device_get_parent(dev);
423
424 destroy_dev(sc->sc_cdev);
425 destroy_dev(sc->sc_cdev_bypass);
426 ppb_lock(ppbus);
427 lpt_release_ppbus(dev);
428 ppb_unlock(ppbus);
429 callout_drain(&sc->sc_timer);
430 if (sc->sc_intr_resource != NULL) {
431 bus_teardown_intr(dev, sc->sc_intr_resource,
432 sc->sc_intr_cookie);
433 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource);
434 }
435 free(sc->sc_inbuf, M_DEVBUF);
436 free(sc->sc_statbuf, M_DEVBUF);
437
438 return (0);
439 }
440
441 static void
lptout(void * arg)442 lptout(void *arg)
443 {
444 struct lpt_data *sc = arg;
445 device_t dev = sc->sc_dev;
446 device_t ppbus __unused;
447
448 ppbus = device_get_parent(dev);
449 ppb_assert_locked(ppbus);
450 lprintf(("T %x ", ppb_rstr(ppbus)));
451 if (sc->sc_state & OPEN) {
452 sc->sc_backoff++;
453 if (sc->sc_backoff > hz/LPTOUTMAX)
454 sc->sc_backoff = hz/LPTOUTMAX;
455 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc);
456 } else
457 sc->sc_state &= ~TOUT;
458
459 if (sc->sc_state & EERROR)
460 sc->sc_state &= ~EERROR;
461
462 /*
463 * Avoid possible hangs due to missed interrupts
464 */
465 if (sc->sc_xfercnt) {
466 lptintr(sc);
467 } else {
468 sc->sc_state &= ~OBUSY;
469 wakeup(dev);
470 }
471 }
472
473 /*
474 * lptopen -- reset the printer, then wait until it's selected and not busy.
475 * If LP_BYPASS flag is selected, then we do not try to select the
476 * printer -- this is just used for passing ioctls.
477 */
478
479 static int
lptopen(struct cdev * dev,int flags,int fmt,struct thread * td)480 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
481 {
482 int trys, err;
483 struct lpt_data *sc = dev->si_drv1;
484 device_t lptdev;
485 device_t ppbus;
486
487 if (!sc)
488 return (ENXIO);
489
490 lptdev = sc->sc_dev;
491 ppbus = device_get_parent(lptdev);
492
493 ppb_lock(ppbus);
494 if (sc->sc_state) {
495 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev),
496 sc->sc_state));
497 ppb_unlock(ppbus);
498 return(EBUSY);
499 } else
500 sc->sc_state |= LPTINIT;
501
502 sc->sc_flags = (uintptr_t)dev->si_drv2;
503
504 /* Check for open with BYPASS flag set. */
505 if (sc->sc_flags & LP_BYPASS) {
506 sc->sc_state = OPEN;
507 ppb_unlock(ppbus);
508 return(0);
509 }
510
511 /* request the ppbus only if we don't have it already */
512 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
513 /* give it a chance to try later */
514 sc->sc_state = 0;
515 ppb_unlock(ppbus);
516 return (err);
517 }
518
519 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev),
520 sc->sc_flags));
521
522 /* set IRQ status according to ENABLE_IRQ flag
523 */
524 if (sc->sc_irq & LP_ENABLE_IRQ)
525 sc->sc_irq |= LP_USE_IRQ;
526 else
527 sc->sc_irq &= ~LP_USE_IRQ;
528
529 /* init printer */
530 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
531 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
532 ppb_wctr(ppbus, 0);
533 sc->sc_primed++;
534 DELAY(500);
535 }
536 }
537
538 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
539
540 /* wait till ready (printer running diagnostics) */
541 trys = 0;
542 do {
543 /* ran out of waiting for the printer */
544 if (trys++ >= LPINITRDY*4) {
545 lprintf(("status %x\n", ppb_rstr(ppbus)));
546
547 lpt_release_ppbus(lptdev);
548 sc->sc_state = 0;
549 ppb_unlock(ppbus);
550 return (EBUSY);
551 }
552
553 /* wait 1/4 second, give up if we get a signal */
554 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit",
555 hz / 4) != EWOULDBLOCK) {
556 lpt_release_ppbus(lptdev);
557 sc->sc_state = 0;
558 ppb_unlock(ppbus);
559 return (EBUSY);
560 }
561
562 /* is printer online and ready for output */
563 } while ((ppb_rstr(ppbus) &
564 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
565 (LPS_SEL|LPS_NBSY|LPS_NERR));
566
567 sc->sc_control = LPC_SEL|LPC_NINIT;
568 if (sc->sc_flags & LP_AUTOLF)
569 sc->sc_control |= LPC_AUTOL;
570
571 /* enable interrupt if interrupt-driven */
572 if (sc->sc_irq & LP_USE_IRQ)
573 sc->sc_control |= LPC_ENA;
574
575 ppb_wctr(ppbus, sc->sc_control);
576
577 sc->sc_state &= ~LPTINIT;
578 sc->sc_state |= OPEN;
579 sc->sc_xfercnt = 0;
580
581 /* only use timeout if using interrupt */
582 lprintf(("irq %x\n", sc->sc_irq));
583 if (sc->sc_irq & LP_USE_IRQ) {
584 sc->sc_state |= TOUT;
585 sc->sc_backoff = hz / LPTOUTINITIAL;
586 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc);
587 }
588
589 /* release the ppbus */
590 lpt_release_ppbus(lptdev);
591 ppb_unlock(ppbus);
592
593 lprintf(("opened.\n"));
594 return(0);
595 }
596
597 /*
598 * lptclose -- close the device, free the local line buffer.
599 *
600 * Check for interrupted write call added.
601 */
602
603 static int
lptclose(struct cdev * dev,int flags,int fmt,struct thread * td)604 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td)
605 {
606 struct lpt_data *sc = dev->si_drv1;
607 device_t lptdev = sc->sc_dev;
608 device_t ppbus = device_get_parent(lptdev);
609 int err;
610
611 ppb_lock(ppbus);
612 if (sc->sc_flags & LP_BYPASS)
613 goto end_close;
614
615 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
616 ppb_unlock(ppbus);
617 return (err);
618 }
619
620 /* if the last write was interrupted, don't complete it */
621 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
622 while ((ppb_rstr(ppbus) &
623 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
624 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
625 /* wait 1 second, give up if we get a signal */
626 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose",
627 hz) != EWOULDBLOCK)
628 break;
629
630 sc->sc_state &= ~OPEN;
631 callout_stop(&sc->sc_timer);
632 ppb_wctr(ppbus, LPC_NINIT);
633
634 /*
635 * unregistration of interrupt forced by release
636 */
637 lpt_release_ppbus(lptdev);
638
639 end_close:
640 sc->sc_state = 0;
641 sc->sc_xfercnt = 0;
642 ppb_unlock(ppbus);
643 lprintf(("closed.\n"));
644 return(0);
645 }
646
647 /*
648 * lpt_pushbytes()
649 * Workhorse for actually spinning and writing bytes to printer
650 * Derived from lpa.c
651 * Originally by ?
652 *
653 * This code is only used when we are polling the port
654 */
655 static int
lpt_pushbytes(struct lpt_data * sc)656 lpt_pushbytes(struct lpt_data *sc)
657 {
658 device_t dev = sc->sc_dev;
659 device_t ppbus = device_get_parent(dev);
660 int spin, err, tic;
661 char ch;
662
663 ppb_assert_locked(ppbus);
664 lprintf(("p"));
665 /* loop for every character .. */
666 while (sc->sc_xfercnt > 0) {
667 /* printer data */
668 ch = *(sc->sc_cp);
669 sc->sc_cp++;
670 sc->sc_xfercnt--;
671
672 /*
673 * Wait for printer ready.
674 * Loop 20 usecs testing BUSY bit, then sleep
675 * for exponentially increasing timeout. (vak)
676 */
677 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
678 DELAY(1); /* XXX delay is NOT this accurate! */
679 if (spin >= MAX_SPIN) {
680 tic = 0;
681 while (NOT_READY(ppbus)) {
682 /*
683 * Now sleep, every cycle a
684 * little longer ..
685 */
686 tic = tic + tic + 1;
687 /*
688 * But no more than 10 seconds. (vak)
689 */
690 if (tic > MAX_SLEEP)
691 tic = MAX_SLEEP;
692 err = ppb_sleep(ppbus, dev, LPPRI,
693 LPT_NAME "poll", tic);
694 if (err != EWOULDBLOCK) {
695 return (err);
696 }
697 }
698 }
699
700 /* output data */
701 ppb_wdtr(ppbus, ch);
702 /* strobe */
703 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
704 ppb_wctr(ppbus, sc->sc_control);
705 }
706 return(0);
707 }
708
709 /*
710 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
711 */
712
713 static int
lptread(struct cdev * dev,struct uio * uio,int ioflag)714 lptread(struct cdev *dev, struct uio *uio, int ioflag)
715 {
716 struct lpt_data *sc = dev->si_drv1;
717 device_t lptdev = sc->sc_dev;
718 device_t ppbus = device_get_parent(lptdev);
719 int error = 0, len;
720
721 if (sc->sc_flags & LP_BYPASS) {
722 /* we can't do reads in bypass mode */
723 return (EPERM);
724 }
725
726 ppb_lock(ppbus);
727 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) {
728 ppb_unlock(ppbus);
729 return (error);
730 }
731
732 /* read data in an other buffer, read/write may be simultaneous */
733 len = 0;
734 while (uio->uio_resid) {
735 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
736 sc->sc_statbuf, min(BUFSTATSIZE,
737 uio->uio_resid), &len))) {
738 goto error;
739 }
740
741 if (!len)
742 goto error; /* no more data */
743
744 ppb_unlock(ppbus);
745 error = uiomove(sc->sc_statbuf, len, uio);
746 ppb_lock(ppbus);
747 if (error)
748 goto error;
749 }
750
751 error:
752 ppb_1284_terminate(ppbus);
753 ppb_unlock(ppbus);
754 return (error);
755 }
756
757 /*
758 * lptwrite --copy a line from user space to a local buffer, then call
759 * putc to get the chars moved to the output queue.
760 *
761 * Flagging of interrupted write added.
762 */
763
764 static int
lptwrite(struct cdev * dev,struct uio * uio,int ioflag)765 lptwrite(struct cdev *dev, struct uio *uio, int ioflag)
766 {
767 register unsigned n;
768 int err;
769 struct lpt_data *sc = dev->si_drv1;
770 device_t lptdev = sc->sc_dev;
771 device_t ppbus = device_get_parent(lptdev);
772
773 if (sc->sc_flags & LP_BYPASS) {
774 /* we can't do writes in bypass mode */
775 return (EPERM);
776 }
777
778 /* request the ppbus only if we don't have it already */
779 ppb_lock(ppbus);
780 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
781 ppb_unlock(ppbus);
782 return (err);
783 }
784
785 sc->sc_state &= ~INTERRUPTED;
786 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
787 sc->sc_cp = sc->sc_inbuf;
788 ppb_unlock(ppbus);
789 err = uiomove(sc->sc_cp, n, uio);
790 ppb_lock(ppbus);
791 if (err)
792 break;
793 sc->sc_xfercnt = n;
794
795 if (sc->sc_irq & LP_ENABLE_EXT) {
796 /* try any extended mode */
797 err = ppb_write(ppbus, sc->sc_cp,
798 sc->sc_xfercnt, 0);
799 switch (err) {
800 case 0:
801 /* if not all data was sent, we could rely
802 * on polling for the last bytes */
803 sc->sc_xfercnt = 0;
804 break;
805 case EINTR:
806 sc->sc_state |= INTERRUPTED;
807 ppb_unlock(ppbus);
808 return (err);
809 case EINVAL:
810 /* advanced mode not avail */
811 log(LOG_NOTICE,
812 "%s: advanced mode not avail, polling\n",
813 device_get_nameunit(sc->sc_dev));
814 break;
815 default:
816 ppb_unlock(ppbus);
817 return (err);
818 }
819 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
820 lprintf(("i"));
821 /* if the printer is ready for a char, */
822 /* give it one */
823 if ((sc->sc_state & OBUSY) == 0){
824 lprintf(("\nC %d. ", sc->sc_xfercnt));
825 lptintr(sc);
826 }
827 lprintf(("W "));
828 if (sc->sc_state & OBUSY)
829 if ((err = ppb_sleep(ppbus, lptdev,
830 LPPRI|PCATCH, LPT_NAME "write", 0))) {
831 sc->sc_state |= INTERRUPTED;
832 ppb_unlock(ppbus);
833 return(err);
834 }
835 }
836
837 /* check to see if we must do a polled write */
838 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
839 lprintf(("p"));
840
841 err = lpt_pushbytes(sc);
842
843 if (err) {
844 ppb_unlock(ppbus);
845 return (err);
846 }
847 }
848 }
849
850 /* we have not been interrupted, release the ppbus */
851 lpt_release_ppbus(lptdev);
852 ppb_unlock(ppbus);
853
854 return (err);
855 }
856
857 /*
858 * lptintr -- handle printer interrupts which occur when the printer is
859 * ready to accept another char.
860 *
861 * do checking for interrupted write call.
862 */
863 static void
lptintr(void * arg)864 lptintr(void *arg)
865 {
866 struct lpt_data *sc = arg;
867 device_t lptdev = sc->sc_dev;
868 device_t ppbus = device_get_parent(lptdev);
869 int sts = 0;
870 int i;
871
872 /*
873 * Is printer online and ready for output?
874 *
875 * Avoid falling back to lptout() too quickly. First spin-loop
876 * to see if the printer will become ready ``really soon now''.
877 */
878 for (i = 0; i < 100 &&
879 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
880
881 if ((sts & RDY_MASK) == LP_READY) {
882 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
883 sc->sc_backoff = hz / LPTOUTINITIAL;
884
885 if (sc->sc_xfercnt) {
886 /* send char */
887 /*lprintf(("%x ", *sc->sc_cp)); */
888 ppb_wdtr(ppbus, *sc->sc_cp++) ;
889 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
890 /* DELAY(X) */
891 ppb_wctr(ppbus, sc->sc_control);
892
893 /* any more data for printer */
894 if (--(sc->sc_xfercnt) > 0)
895 return;
896 }
897
898 /*
899 * No more data waiting for printer.
900 * Wakeup is not done if write call was not interrupted.
901 */
902 sc->sc_state &= ~OBUSY;
903
904 if (!(sc->sc_state & INTERRUPTED))
905 wakeup(lptdev);
906 lprintf(("w "));
907 return;
908 } else { /* check for error */
909 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
910 (sc->sc_state & OPEN))
911 sc->sc_state |= EERROR;
912 /* lptout() will jump in and try to restart. */
913 }
914 lprintf(("sts %x ", sts));
915 }
916
917 static int
lptioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)918 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
919 {
920 int error = 0;
921 struct lpt_data *sc = dev->si_drv1;
922 device_t ppbus;
923 u_char old_sc_irq; /* old printer IRQ status */
924
925 switch (cmd) {
926 case LPT_IRQ :
927 ppbus = device_get_parent(sc->sc_dev);
928 ppb_lock(ppbus);
929 if (sc->sc_irq & LP_HAS_IRQ) {
930 /*
931 * NOTE:
932 * If the IRQ status is changed,
933 * this will only be visible on the
934 * next open.
935 *
936 * If interrupt status changes,
937 * this gets syslog'd.
938 */
939 old_sc_irq = sc->sc_irq;
940 switch (*(int*)data) {
941 case 0:
942 sc->sc_irq &= (~LP_ENABLE_IRQ);
943 break;
944 case 1:
945 sc->sc_irq &= (~LP_ENABLE_EXT);
946 sc->sc_irq |= LP_ENABLE_IRQ;
947 break;
948 case 2:
949 /* classic irq based transfer and advanced
950 * modes are in conflict
951 */
952 sc->sc_irq &= (~LP_ENABLE_IRQ);
953 sc->sc_irq |= LP_ENABLE_EXT;
954 break;
955 case 3:
956 sc->sc_irq &= (~LP_ENABLE_EXT);
957 break;
958 default:
959 break;
960 }
961
962 if (old_sc_irq != sc->sc_irq )
963 log(LOG_NOTICE, "%s: switched to %s %s mode\n",
964 device_get_nameunit(sc->sc_dev),
965 (sc->sc_irq & LP_ENABLE_IRQ)?
966 "interrupt-driven":"polled",
967 (sc->sc_irq & LP_ENABLE_EXT)?
968 "extended":"standard");
969 } else /* polled port */
970 error = EOPNOTSUPP;
971 ppb_unlock(ppbus);
972 break;
973 default:
974 error = ENODEV;
975 }
976
977 return(error);
978 }
979
980 static device_method_t lpt_methods[] = {
981 /* device interface */
982 DEVMETHOD(device_identify, lpt_identify),
983 DEVMETHOD(device_probe, lpt_probe),
984 DEVMETHOD(device_attach, lpt_attach),
985 DEVMETHOD(device_detach, lpt_detach),
986 { 0, 0 }
987 };
988
989 static driver_t lpt_driver = {
990 LPT_NAME,
991 lpt_methods,
992 sizeof(struct lpt_data),
993 };
994
995 DRIVER_MODULE(lpt, ppbus, lpt_driver, 0, 0);
996 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);
997