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 __FBSDID("$FreeBSD$");
57
58 /*
59 * Device Driver for AT parallel printer port
60 * Written by William Jolitz 12/18/90
61 */
62
63 /*
64 * Updated for ppbus by Nicolas Souchu
65 * [Mon Jul 28 1997]
66 */
67
68 #include "opt_lpt.h"
69
70 #include <sys/param.h>
71 #include <sys/systm.h>
72 #include <sys/module.h>
73 #include <sys/bus.h>
74 #include <sys/conf.h>
75 #include <sys/kernel.h>
76 #include <sys/uio.h>
77 #include <sys/syslog.h>
78 #include <sys/malloc.h>
79
80 #include <machine/bus.h>
81 #include <machine/resource.h>
82 #include <sys/rman.h>
83
84 #include <dev/ppbus/lptio.h>
85 #include <dev/ppbus/ppbconf.h>
86 #include <dev/ppbus/ppb_1284.h>
87 #include <dev/ppbus/lpt.h>
88 #include "ppbus_if.h"
89 #include <dev/ppbus/ppbio.h>
90
91 #ifndef LPT_DEBUG
92 #define lprintf(args)
93 #else
94 #define lprintf(args) \
95 do { \
96 if (lptflag) \
97 printf args; \
98 } while (0)
99 static int volatile lptflag = 1;
100 #endif
101
102 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
103 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
104 #define LPTOUTMAX 1 /* maximal timeout 1 s */
105 #define LPPRI (PZERO+8)
106 #define BUFSIZE 1024
107 #define BUFSTATSIZE 32
108
109 struct lpt_data {
110 device_t sc_dev;
111 struct cdev *sc_cdev;
112 struct cdev *sc_cdev_bypass;
113 short sc_state;
114 /* default case: negative prime, negative ack, handshake strobe,
115 prime once */
116 u_char sc_control;
117 char sc_flags;
118 #define LP_POS_INIT 0x04 /* if we are a positive init signal */
119 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
120 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
121 #define LP_PRIMEOPEN 0x20 /* prime on every open */
122 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
123 #define LP_BYPASS 0x80 /* bypass printer ready checks */
124 void *sc_inbuf;
125 void *sc_statbuf;
126 short sc_xfercnt ;
127 char sc_primed;
128 char *sc_cp ;
129 u_short sc_irq ; /* IRQ status of port */
130 #define LP_HAS_IRQ 0x01 /* we have an irq available */
131 #define LP_USE_IRQ 0x02 /* we are using our irq */
132 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
133 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
134 u_char sc_backoff ; /* time to call lptout() again */
135 struct callout sc_timer;
136
137 struct resource *sc_intr_resource; /* interrupt resource */
138 void *sc_intr_cookie; /* interrupt cookie */
139 };
140
141 #define LPT_NAME "lpt" /* our official name */
142
143 static callout_func_t lptout;
144 static int lpt_port_test(device_t dev, u_char data, u_char mask);
145 static int lpt_detect(device_t dev);
146
147 #define DEVTOSOFTC(dev) \
148 ((struct lpt_data *)device_get_softc(dev))
149
150 static void lptintr(void *arg);
151
152 static devclass_t lpt_devclass;
153
154 /* bits for state */
155 #define OPEN (1<<0) /* device is open */
156 #define ASLP (1<<1) /* awaiting draining of printer */
157 #define EERROR (1<<2) /* error was received from printer */
158 #define OBUSY (1<<3) /* printer is busy doing output */
159 #define LPTOUT (1<<4) /* timeout while not selected */
160 #define TOUT (1<<5) /* timeout while not selected */
161 #define LPTINIT (1<<6) /* waiting to initialize for open */
162 #define INTERRUPTED (1<<7) /* write call was interrupted */
163 #define HAVEBUS (1<<8) /* the driver owns the bus */
164
165 /* status masks to interrogate printer status */
166 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
167 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
168
169 /* Printer Ready condition - from lpa.c */
170 /* Only used in polling code */
171 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
172 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
173 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
174
175 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
176 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
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
lpt_request_ppbus(device_t dev,int how)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
lpt_release_ppbus(device_t dev)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
lpt_port_test(device_t ppbus,u_char data,u_char mask)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 [email protected]
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 manuals 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
lpt_detect(device_t dev)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
lpt_identify(driver_t * driver,device_t parent)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
lpt_probe(device_t dev)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
lpt_attach(device_t dev)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
lpt_detach(device_t dev)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
lptout(void * arg)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
lptopen(struct cdev * dev,int flags,int fmt,struct thread * td)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
lptclose(struct cdev * dev,int flags,int fmt,struct thread * td)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
lpt_pushbytes(struct lpt_data * sc)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 return(0);
711 }
712
713 /*
714 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
715 */
716
717 static int
lptread(struct cdev * dev,struct uio * uio,int ioflag)718 lptread(struct cdev *dev, struct uio *uio, int ioflag)
719 {
720 struct lpt_data *sc = dev->si_drv1;
721 device_t lptdev = sc->sc_dev;
722 device_t ppbus = device_get_parent(lptdev);
723 int error = 0, len;
724
725 if (sc->sc_flags & LP_BYPASS) {
726 /* we can't do reads in bypass mode */
727 return (EPERM);
728 }
729
730 ppb_lock(ppbus);
731 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) {
732 ppb_unlock(ppbus);
733 return (error);
734 }
735
736 /* read data in an other buffer, read/write may be simultaneous */
737 len = 0;
738 while (uio->uio_resid) {
739 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
740 sc->sc_statbuf, min(BUFSTATSIZE,
741 uio->uio_resid), &len))) {
742 goto error;
743 }
744
745 if (!len)
746 goto error; /* no more data */
747
748 ppb_unlock(ppbus);
749 error = uiomove(sc->sc_statbuf, len, uio);
750 ppb_lock(ppbus);
751 if (error)
752 goto error;
753 }
754
755 error:
756 ppb_1284_terminate(ppbus);
757 ppb_unlock(ppbus);
758 return (error);
759 }
760
761 /*
762 * lptwrite --copy a line from user space to a local buffer, then call
763 * putc to get the chars moved to the output queue.
764 *
765 * Flagging of interrupted write added.
766 */
767
768 static int
lptwrite(struct cdev * dev,struct uio * uio,int ioflag)769 lptwrite(struct cdev *dev, struct uio *uio, int ioflag)
770 {
771 register unsigned n;
772 int err;
773 struct lpt_data *sc = dev->si_drv1;
774 device_t lptdev = sc->sc_dev;
775 device_t ppbus = device_get_parent(lptdev);
776
777 if (sc->sc_flags & LP_BYPASS) {
778 /* we can't do writes in bypass mode */
779 return (EPERM);
780 }
781
782 /* request the ppbus only if we don't have it already */
783 ppb_lock(ppbus);
784 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
785 ppb_unlock(ppbus);
786 return (err);
787 }
788
789 sc->sc_state &= ~INTERRUPTED;
790 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
791 sc->sc_cp = sc->sc_inbuf;
792 ppb_unlock(ppbus);
793 err = uiomove(sc->sc_cp, n, uio);
794 ppb_lock(ppbus);
795 if (err)
796 break;
797 sc->sc_xfercnt = n;
798
799 if (sc->sc_irq & LP_ENABLE_EXT) {
800 /* try any extended mode */
801 err = ppb_write(ppbus, sc->sc_cp,
802 sc->sc_xfercnt, 0);
803 switch (err) {
804 case 0:
805 /* if not all data was sent, we could rely
806 * on polling for the last bytes */
807 sc->sc_xfercnt = 0;
808 break;
809 case EINTR:
810 sc->sc_state |= INTERRUPTED;
811 ppb_unlock(ppbus);
812 return (err);
813 case EINVAL:
814 /* advanced mode not avail */
815 log(LOG_NOTICE,
816 "%s: advanced mode not avail, polling\n",
817 device_get_nameunit(sc->sc_dev));
818 break;
819 default:
820 ppb_unlock(ppbus);
821 return (err);
822 }
823 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
824 lprintf(("i"));
825 /* if the printer is ready for a char, */
826 /* give it one */
827 if ((sc->sc_state & OBUSY) == 0){
828 lprintf(("\nC %d. ", sc->sc_xfercnt));
829 lptintr(sc);
830 }
831 lprintf(("W "));
832 if (sc->sc_state & OBUSY)
833 if ((err = ppb_sleep(ppbus, lptdev,
834 LPPRI|PCATCH, LPT_NAME "write", 0))) {
835 sc->sc_state |= INTERRUPTED;
836 ppb_unlock(ppbus);
837 return(err);
838 }
839 }
840
841 /* check to see if we must do a polled write */
842 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
843 lprintf(("p"));
844
845 err = lpt_pushbytes(sc);
846
847 if (err) {
848 ppb_unlock(ppbus);
849 return (err);
850 }
851 }
852 }
853
854 /* we have not been interrupted, release the ppbus */
855 lpt_release_ppbus(lptdev);
856 ppb_unlock(ppbus);
857
858 return (err);
859 }
860
861 /*
862 * lptintr -- handle printer interrupts which occur when the printer is
863 * ready to accept another char.
864 *
865 * do checking for interrupted write call.
866 */
867 static void
lptintr(void * arg)868 lptintr(void *arg)
869 {
870 struct lpt_data *sc = arg;
871 device_t lptdev = sc->sc_dev;
872 device_t ppbus = device_get_parent(lptdev);
873 int sts = 0;
874 int i;
875
876 /*
877 * Is printer online and ready for output?
878 *
879 * Avoid falling back to lptout() too quickly. First spin-loop
880 * to see if the printer will become ready ``really soon now''.
881 */
882 for (i = 0; i < 100 &&
883 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
884
885 if ((sts & RDY_MASK) == LP_READY) {
886 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
887 sc->sc_backoff = hz / LPTOUTINITIAL;
888
889 if (sc->sc_xfercnt) {
890 /* send char */
891 /*lprintf(("%x ", *sc->sc_cp)); */
892 ppb_wdtr(ppbus, *sc->sc_cp++) ;
893 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
894 /* DELAY(X) */
895 ppb_wctr(ppbus, sc->sc_control);
896
897 /* any more data for printer */
898 if (--(sc->sc_xfercnt) > 0)
899 return;
900 }
901
902 /*
903 * No more data waiting for printer.
904 * Wakeup is not done if write call was not interrupted.
905 */
906 sc->sc_state &= ~OBUSY;
907
908 if (!(sc->sc_state & INTERRUPTED))
909 wakeup(lptdev);
910 lprintf(("w "));
911 return;
912 } else { /* check for error */
913 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
914 (sc->sc_state & OPEN))
915 sc->sc_state |= EERROR;
916 /* lptout() will jump in and try to restart. */
917 }
918 lprintf(("sts %x ", sts));
919 }
920
921 static int
lptioctl(struct cdev * dev,u_long cmd,caddr_t data,int flags,struct thread * td)922 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
923 {
924 int error = 0;
925 struct lpt_data *sc = dev->si_drv1;
926 device_t ppbus;
927 u_char old_sc_irq; /* old printer IRQ status */
928
929 switch (cmd) {
930 case LPT_IRQ :
931 ppbus = device_get_parent(sc->sc_dev);
932 ppb_lock(ppbus);
933 if (sc->sc_irq & LP_HAS_IRQ) {
934 /*
935 * NOTE:
936 * If the IRQ status is changed,
937 * this will only be visible on the
938 * next open.
939 *
940 * If interrupt status changes,
941 * this gets syslog'd.
942 */
943 old_sc_irq = sc->sc_irq;
944 switch (*(int*)data) {
945 case 0:
946 sc->sc_irq &= (~LP_ENABLE_IRQ);
947 break;
948 case 1:
949 sc->sc_irq &= (~LP_ENABLE_EXT);
950 sc->sc_irq |= LP_ENABLE_IRQ;
951 break;
952 case 2:
953 /* classic irq based transfer and advanced
954 * modes are in conflict
955 */
956 sc->sc_irq &= (~LP_ENABLE_IRQ);
957 sc->sc_irq |= LP_ENABLE_EXT;
958 break;
959 case 3:
960 sc->sc_irq &= (~LP_ENABLE_EXT);
961 break;
962 default:
963 break;
964 }
965
966 if (old_sc_irq != sc->sc_irq )
967 log(LOG_NOTICE, "%s: switched to %s %s mode\n",
968 device_get_nameunit(sc->sc_dev),
969 (sc->sc_irq & LP_ENABLE_IRQ)?
970 "interrupt-driven":"polled",
971 (sc->sc_irq & LP_ENABLE_EXT)?
972 "extended":"standard");
973 } else /* polled port */
974 error = EOPNOTSUPP;
975 ppb_unlock(ppbus);
976 break;
977 default:
978 error = ENODEV;
979 }
980
981 return(error);
982 }
983
984 static device_method_t lpt_methods[] = {
985 /* device interface */
986 DEVMETHOD(device_identify, lpt_identify),
987 DEVMETHOD(device_probe, lpt_probe),
988 DEVMETHOD(device_attach, lpt_attach),
989 DEVMETHOD(device_detach, lpt_detach),
990 { 0, 0 }
991 };
992
993 static driver_t lpt_driver = {
994 LPT_NAME,
995 lpt_methods,
996 sizeof(struct lpt_data),
997 };
998
999 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);
1000 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);
1001