Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / dev / misc / lpt / lpt.c
CommitLineData
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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 * $FreeBSD: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $
b13267a5 52 * $DragonFly: src/sys/dev/misc/lpt/lpt.c,v 1.17 2006/09/10 01:26:34 dillon Exp $
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53 */
54
55/*
56 * Device Driver for AT parallel printer port
57 * Written by William Jolitz 12/18/90
58 */
59
60/*
61 * Updated for ppbus by Nicolas Souchu
62 * [Mon Jul 28 1997]
63 */
64
65#include "opt_lpt.h"
66
67#include <sys/param.h>
68#include <sys/systm.h>
69#include <sys/module.h>
70#include <sys/bus.h>
71#include <sys/conf.h>
fef8985e 72#include <sys/device.h>
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73#include <sys/kernel.h>
74#include <sys/uio.h>
75#include <sys/syslog.h>
b28b340f 76#include <sys/thread2.h>
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77#include <sys/malloc.h>
78
79#include <machine/clock.h>
80#include <machine/bus.h>
81#include <machine/resource.h>
82#include <sys/rman.h>
83
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84#include "lptio.h"
85#include <bus/ppbus/ppbconf.h>
86#include <bus/ppbus/ppb_1284.h>
87#include "lpt.h"
984263bc 88#include "ppbus_if.h"
1f2de5d4 89#include <bus/ppbus/ppbio.h>
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90
91MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers");
92
93#ifndef LPT_DEBUG
94#define lprintf(args)
95#else
96#define lprintf(args) \
97 do { \
98 if (lptflag) \
99 printf args; \
100 } while (0)
101static int volatile lptflag = 1;
102#endif
103
104#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
105#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
106#define LPTOUTMAX 1 /* maximal timeout 1 s */
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107#define BUFSIZE 1024
108#define BUFSTATSIZE 32
109
110#define LPTUNIT(s) ((s)&0x03)
111#define LPTFLAGS(s) ((s)&0xfc)
112
113struct lpt_data {
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114 short sc_state;
115 /* default case: negative prime, negative ack, handshake strobe,
116 prime once */
117 u_char sc_control;
118 char sc_flags;
e4c9c0c8 119#define LP_UNITMASK 0x03 /* up to 4 units */
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120#define LP_POS_INIT 0x04 /* if we are a postive init signal */
121#define LP_POS_ACK 0x08 /* if we are a positive going ack */
122#define LP_NO_PRIME 0x10 /* don't prime the printer at all */
123#define LP_PRIMEOPEN 0x20 /* prime on every open */
124#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
125#define LP_BYPASS 0x80 /* bypass printer ready checks */
126 void *sc_inbuf;
127 void *sc_statbuf;
128 short sc_xfercnt ;
129 char sc_primed;
130 char *sc_cp ;
131 u_short sc_irq ; /* IRQ status of port */
132#define LP_HAS_IRQ 0x01 /* we have an irq available */
133#define LP_USE_IRQ 0x02 /* we are using our irq */
134#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
135#define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
136 u_char sc_backoff ; /* time to call lptout() again */
137
138 struct resource *intr_resource; /* interrupt resource */
139 void *intr_cookie; /* interrupt registration cookie */
6aed8a5b 140 struct callout sc_callout;
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141};
142
143#define LPT_NAME "lpt" /* our official name */
144
145static timeout_t lptout;
146static int lpt_port_test(device_t dev, u_char data, u_char mask);
147static int lpt_detect(device_t dev);
148
149#define DEVTOSOFTC(dev) \
150 ((struct lpt_data *)device_get_softc(dev))
151#define UNITOSOFTC(unit) \
152 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit)))
153#define UNITODEVICE(unit) \
154 (devclass_get_device(lpt_devclass, (unit)))
155
156static void lptintr(device_t dev);
157static void lpt_intr(void *arg); /* without spls */
158
159static devclass_t lpt_devclass;
160
161
162/* bits for state */
163#define OPEN (1<<0) /* device is open */
164#define ASLP (1<<1) /* awaiting draining of printer */
165#define EERROR (1<<2) /* error was received from printer */
166#define OBUSY (1<<3) /* printer is busy doing output */
167#define LPTOUT (1<<4) /* timeout while not selected */
168#define TOUT (1<<5) /* timeout while not selected */
169#define LPTINIT (1<<6) /* waiting to initialize for open */
170#define INTERRUPTED (1<<7) /* write call was interrupted */
171
172#define HAVEBUS (1<<8) /* the driver owns the bus */
173
174
175/* status masks to interrogate printer status */
176#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
177#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
178
179/* Printer Ready condition - from lpa.c */
180/* Only used in polling code */
181#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
182#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
183#define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
184
185#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
186#define MAX_SPIN 20 /* Max delay for device ready in usecs */
187
188
189static d_open_t lptopen;
190static d_close_t lptclose;
191static d_write_t lptwrite;
192static d_read_t lptread;
193static d_ioctl_t lptioctl;
194
195#define CDEV_MAJOR 16
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196static struct dev_ops lpt_ops = {
197 { LPT_NAME, CDEV_MAJOR, 0 },
198 .d_open = lptopen,
199 .d_close = lptclose,
200 .d_read = lptread,
201 .d_write = lptwrite,
202 .d_ioctl = lptioctl,
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203};
204
205static int
206lpt_request_ppbus(device_t dev, int how)
207{
208 device_t ppbus = device_get_parent(dev);
209 struct lpt_data *sc = DEVTOSOFTC(dev);
210 int error;
211
212 if (sc->sc_state & HAVEBUS)
213 return (0);
214
215 /* we have the bus only if the request succeded */
216 if ((error = ppb_request_bus(ppbus, dev, how)) == 0)
217 sc->sc_state |= HAVEBUS;
218
219 return (error);
220}
221
222static int
223lpt_release_ppbus(device_t dev)
224{
225 device_t ppbus = device_get_parent(dev);
226 struct lpt_data *sc = DEVTOSOFTC(dev);
227 int error = 0;
228
229 if ((error = ppb_release_bus(ppbus, dev)) == 0)
230 sc->sc_state &= ~HAVEBUS;
231
232 return (error);
233}
234
235/*
236 * Internal routine to lptprobe to do port tests of one byte value
237 */
238static int
239lpt_port_test(device_t ppbus, u_char data, u_char mask)
240{
241 int temp, timeout;
242
243 data = data & mask;
244 ppb_wdtr(ppbus, data);
245 timeout = 10000;
246 do {
247 DELAY(10);
248 temp = ppb_rdtr(ppbus) & mask;
249 }
250 while (temp != data && --timeout);
251 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
252 return (temp == data);
253}
254
255/*
256 * Probe simplified by replacing multiple loops with a hardcoded
257 * test pattern - 1999/02/08 des@freebsd.org
258 *
259 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
260 * Based partially on Rod Grimes' printer probe
261 *
262 * Logic:
263 * 1) If no port address was given, use the bios detected ports
264 * and autodetect what ports the printers are on.
265 * 2) Otherwise, probe the data port at the address given,
266 * using the method in Rod Grimes' port probe.
267 * (Much code ripped off directly from Rod's probe.)
268 *
269 * Comments from Rod's probe:
270 * Logic:
271 * 1) You should be able to write to and read back the same value
272 * to the data port. Do an alternating zeros, alternating ones,
273 * walking zero, and walking one test to check for stuck bits.
274 *
275 * 2) You should be able to write to and read back the same value
276 * to the control port lower 5 bits, the upper 3 bits are reserved
277 * per the IBM PC technical reference manauls and different boards
278 * do different things with them. Do an alternating zeros, alternating
279 * ones, walking zero, and walking one test to check for stuck bits.
280 *
281 * Some printers drag the strobe line down when the are powered off
282 * so this bit has been masked out of the control port test.
283 *
284 * XXX Some printers may not like a fast pulse on init or strobe, I
285 * don't know at this point, if that becomes a problem these bits
286 * should be turned off in the mask byte for the control port test.
287 *
288 * We are finally left with a mask of 0x14, due to some printers
289 * being adamant about holding other bits high ........
290 *
291 * Before probing the control port, we write a 0 to the data port -
292 * If not, some printers chuck out garbage when the strobe line
293 * gets toggled.
294 *
295 * 3) Set the data and control ports to a value of 0
296 *
297 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
298 * Epson FX-1170 and C.Itoh 8510RM
299 * printers.
300 * Quick exit on fail added.
301 */
302static int
303lpt_detect(device_t dev)
304{
305 device_t ppbus = device_get_parent(dev);
306
307 static u_char testbyte[18] = {
308 0x55, /* alternating zeros */
309 0xaa, /* alternating ones */
310 0xfe, 0xfd, 0xfb, 0xf7,
311 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
312 0x01, 0x02, 0x04, 0x08,
313 0x10, 0x20, 0x40, 0x80 /* walking one */
314 };
315 int i, error, status;
316
317 status = 1; /* assume success */
318
319 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
320 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
321 status = 0;
322 goto end_probe;
323 }
324
325 for (i = 0; i < 18 && status; i++)
326 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
327 status = 0;
328 goto end_probe;
329 }
330
331end_probe:
332 /* write 0's to control and data ports */
333 ppb_wdtr(ppbus, 0);
334 ppb_wctr(ppbus, 0);
335
336 lpt_release_ppbus(dev);
337
338 return (status);
339}
340
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341/*
342 * lpt_probe()
343 */
344static int
345lpt_probe(device_t dev)
346{
347 struct lpt_data *sc;
348
349 sc = DEVTOSOFTC(dev);
350 bzero(sc, sizeof(struct lpt_data));
351
352 /*
353 * Now, try to detect the printer.
354 */
355 if (!lpt_detect(dev))
356 return (ENXIO);
357
358 device_set_desc(dev, "Printer");
359
360 return (0);
361}
362
363static int
364lpt_attach(device_t dev)
365{
366 device_t ppbus = device_get_parent(dev);
367 struct lpt_data *sc = DEVTOSOFTC(dev);
368 int zero = 0, unit = device_get_unit(dev);
369 int error;
370 uintptr_t irq;
371
372 sc->sc_primed = 0; /* not primed yet */
6aed8a5b 373 callout_init(&sc->sc_callout);
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374
375 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
376 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
377 return (0);
378 }
379
380 ppb_wctr(ppbus, LPC_NINIT);
381
382 /* check if we can use interrupt, should be done by ppc stuff */
383 lprintf(("oldirq %x\n", sc->sc_irq));
384
385 /* retrieve the ppbus irq */
386 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
387
388 if (irq > 0) {
389 /* declare our interrupt handler */
390 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
391 &zero, irq, irq, 1, RF_SHAREABLE);
392 }
393 if (sc->intr_resource) {
394 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
395 device_printf(dev, "Interrupt-driven port\n");
396 } else {
397 sc->sc_irq = 0;
398 device_printf(dev, "Polled port\n");
399 }
400 lprintf(("irq %x %x\n", irq, sc->sc_irq));
401
402 lpt_release_ppbus(dev);
403
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404 dev_ops_add(&lpt_ops, LP_UNITMASK, unit);
405 make_dev(&lpt_ops, unit,
984263bc 406 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
fef8985e 407 make_dev(&lpt_ops, unit | LP_BYPASS,
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408 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
409 return (0);
410}
411
412static void
413lptout(void *arg)
414{
415 device_t dev = (device_t)arg;
416 struct lpt_data *sc = DEVTOSOFTC(dev);
417#ifdef LPT_DEBUG
418 device_t ppbus = device_get_parent(dev);
419#endif
420
421 lprintf(("T %x ", ppb_rstr(ppbus)));
422 if (sc->sc_state & OPEN) {
423 sc->sc_backoff++;
424 if (sc->sc_backoff > hz/LPTOUTMAX)
425 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
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426 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev);
427 } else {
984263bc 428 sc->sc_state &= ~TOUT;
6aed8a5b 429 }
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430
431 if (sc->sc_state & EERROR)
432 sc->sc_state &= ~EERROR;
433
434 /*
435 * Avoid possible hangs due to missed interrupts
436 */
437 if (sc->sc_xfercnt) {
438 lptintr(dev);
439 } else {
440 sc->sc_state &= ~OBUSY;
441 wakeup((caddr_t)dev);
442 }
443}
444
445/*
446 * lptopen -- reset the printer, then wait until it's selected and not busy.
447 * If LP_BYPASS flag is selected, then we do not try to select the
448 * printer -- this is just used for passing ioctls.
449 */
450
451static int
fef8985e 452lptopen(struct dev_open_args *ap)
984263bc 453{
b13267a5 454 cdev_t dev = ap->a_head.a_dev;
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455 int trys, err;
456 u_int unit = LPTUNIT(minor(dev));
457 struct lpt_data *sc = UNITOSOFTC(unit);
458 device_t lptdev = UNITODEVICE(unit);
459 device_t ppbus = device_get_parent(lptdev);
460
461 if (!sc)
462 return (ENXIO);
463
464 if (sc->sc_state) {
465 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
466 return(EBUSY);
467 } else
468 sc->sc_state |= LPTINIT;
469
470 sc->sc_flags = LPTFLAGS(minor(dev));
471
472 /* Check for open with BYPASS flag set. */
473 if (sc->sc_flags & LP_BYPASS) {
474 sc->sc_state = OPEN;
475 return(0);
476 }
477
478 /* request the ppbus only if we don't have it already */
479 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
480 /* give it a chance to try later */
481 sc->sc_state = 0;
482 return (err);
483 }
484
b28b340f 485 crit_enter();
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486 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
487
488 /* set IRQ status according to ENABLE_IRQ flag
489 */
490 if (sc->sc_irq & LP_ENABLE_IRQ)
491 sc->sc_irq |= LP_USE_IRQ;
492 else
493 sc->sc_irq &= ~LP_USE_IRQ;
494
495 /* init printer */
496 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
497 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
498 ppb_wctr(ppbus, 0);
499 sc->sc_primed++;
500 DELAY(500);
501 }
502 }
503
504 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
505
506 /* wait till ready (printer running diagnostics) */
507 trys = 0;
508 do {
509 /* ran out of waiting for the printer */
510 if (trys++ >= LPINITRDY*4) {
b28b340f 511 crit_exit();
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512 sc->sc_state = 0;
513 lprintf(("status %x\n", ppb_rstr(ppbus)));
514
515 lpt_release_ppbus(lptdev);
516 return (EBUSY);
517 }
518
519 /* wait 1/4 second, give up if we get a signal */
377d4740 520 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) !=
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521 EWOULDBLOCK) {
522 sc->sc_state = 0;
b28b340f 523 crit_exit();
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524
525 lpt_release_ppbus(lptdev);
526 return (EBUSY);
527 }
528
529 /* is printer online and ready for output */
530 } while ((ppb_rstr(ppbus) &
531 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
532 (LPS_SEL|LPS_NBSY|LPS_NERR));
533
534 sc->sc_control = LPC_SEL|LPC_NINIT;
535 if (sc->sc_flags & LP_AUTOLF)
536 sc->sc_control |= LPC_AUTOL;
537
538 /* enable interrupt if interrupt-driven */
539 if (sc->sc_irq & LP_USE_IRQ)
540 sc->sc_control |= LPC_ENA;
541
542 ppb_wctr(ppbus, sc->sc_control);
543
544 sc->sc_state = OPEN;
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545 sc->sc_inbuf = kmalloc(BUFSIZE, M_LPT, M_WAITOK);
546 sc->sc_statbuf = kmalloc(BUFSTATSIZE, M_LPT, M_WAITOK);
984263bc 547 sc->sc_xfercnt = 0;
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548
549 crit_exit();
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550
551 /* release the ppbus */
552 lpt_release_ppbus(lptdev);
553
554 /* only use timeout if using interrupt */
555 lprintf(("irq %x\n", sc->sc_irq));
556 if (sc->sc_irq & LP_USE_IRQ) {
557 sc->sc_state |= TOUT;
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558 sc->sc_backoff = hz / LPTOUTINITIAL;
559 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev);
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560 }
561
562 lprintf(("opened.\n"));
563 return(0);
564}
565
566/*
567 * lptclose -- close the device, free the local line buffer.
568 *
569 * Check for interrupted write call added.
570 */
571
572static int
fef8985e 573lptclose(struct dev_close_args *ap)
984263bc 574{
b13267a5 575 cdev_t dev = ap->a_head.a_dev;
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576 u_int unit = LPTUNIT(minor(dev));
577 struct lpt_data *sc = UNITOSOFTC(unit);
578 device_t lptdev = UNITODEVICE(unit);
579 device_t ppbus = device_get_parent(lptdev);
580 int err;
581
582 if(sc->sc_flags & LP_BYPASS)
583 goto end_close;
584
585 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
586 return (err);
587
588 sc->sc_state &= ~OPEN;
589
590 /* if the last write was interrupted, don't complete it */
6aed8a5b 591 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) {
984263bc 592 while ((ppb_rstr(ppbus) &
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593 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
594 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) {
984263bc 595 /* wait 1/4 second, give up if we get a signal */
377d4740 596 if (tsleep((caddr_t)lptdev, PCATCH,
6aed8a5b 597 "lpclose", hz) != EWOULDBLOCK) {
984263bc 598 break;
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599 }
600 }
601 }
602 callout_stop(&sc->sc_callout);
984263bc 603 ppb_wctr(ppbus, LPC_NINIT);
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604 kfree(sc->sc_inbuf, M_LPT);
605 kfree(sc->sc_statbuf, M_LPT);
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606
607end_close:
608 /* release the bus anyway
609 * unregistration of interrupt forced by release
610 */
611 lpt_release_ppbus(lptdev);
612
613 sc->sc_state = 0;
614 sc->sc_xfercnt = 0;
615 lprintf(("closed.\n"));
616 return(0);
617}
618
619/*
620 * lpt_pushbytes()
621 * Workhorse for actually spinning and writing bytes to printer
622 * Derived from lpa.c
623 * Originally by ?
624 *
625 * This code is only used when we are polling the port
626 */
627static int
628lpt_pushbytes(device_t dev)
629{
630 struct lpt_data *sc = DEVTOSOFTC(dev);
631 device_t ppbus = device_get_parent(dev);
632 int spin, err, tic;
633 char ch;
634
635 lprintf(("p"));
636 /* loop for every character .. */
637 while (sc->sc_xfercnt > 0) {
638 /* printer data */
639 ch = *(sc->sc_cp);
640 sc->sc_cp++;
641 sc->sc_xfercnt--;
642
643 /*
644 * Wait for printer ready.
645 * Loop 20 usecs testing BUSY bit, then sleep
646 * for exponentially increasing timeout. (vak)
647 */
648 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
649 DELAY(1); /* XXX delay is NOT this accurate! */
650 if (spin >= MAX_SPIN) {
651 tic = 0;
652 while (NOT_READY(ppbus)) {
653 /*
654 * Now sleep, every cycle a
655 * little longer ..
656 */
657 tic = tic + tic + 1;
658 /*
659 * But no more than 10 seconds. (vak)
660 */
661 if (tic > MAX_SLEEP)
662 tic = MAX_SLEEP;
377d4740 663 err = tsleep((caddr_t)dev, 0,
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664 LPT_NAME "poll", tic);
665 if (err != EWOULDBLOCK) {
666 return (err);
667 }
668 }
669 }
670
671 /* output data */
672 ppb_wdtr(ppbus, ch);
673 /* strobe */
674 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
675 ppb_wctr(ppbus, sc->sc_control);
676
677 }
678 return(0);
679}
680
681/*
682 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
683 */
684
685static int
fef8985e 686lptread(struct dev_read_args *ap)
984263bc 687{
b13267a5 688 cdev_t dev = ap->a_head.a_dev;
fef8985e 689 struct uio *uio = ap->a_uio;
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690 u_int unit = LPTUNIT(minor(dev));
691 struct lpt_data *sc = UNITOSOFTC(unit);
692 device_t lptdev = UNITODEVICE(unit);
693 device_t ppbus = device_get_parent(lptdev);
694 int error = 0, len;
695
696 if (sc->sc_flags & LP_BYPASS) {
697 /* we can't do reads in bypass mode */
698 return (EPERM);
699 }
700
701 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0)))
702 return (error);
703
704 /* read data in an other buffer, read/write may be simultaneous */
705 len = 0;
706 while (uio->uio_resid) {
707 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
708 sc->sc_statbuf, min(BUFSTATSIZE,
709 uio->uio_resid), &len))) {
710 goto error;
711 }
712
713 if (!len)
714 goto error; /* no more data */
715
716 if ((error = uiomove(sc->sc_statbuf, len, uio)))
717 goto error;
718 }
719
720error:
721 ppb_1284_terminate(ppbus);
722 return (error);
723}
724
725/*
726 * lptwrite --copy a line from user space to a local buffer, then call
727 * putc to get the chars moved to the output queue.
728 *
729 * Flagging of interrupted write added.
730 */
731
732static int
fef8985e 733lptwrite(struct dev_write_args *ap)
984263bc 734{
b13267a5 735 cdev_t dev = ap->a_head.a_dev;
fef8985e 736 struct uio *uio = ap->a_uio;
f96d6c88 737 unsigned n;
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738 int err;
739 u_int unit = LPTUNIT(minor(dev));
740 struct lpt_data *sc = UNITOSOFTC(unit);
741 device_t lptdev = UNITODEVICE(unit);
742 device_t ppbus = device_get_parent(lptdev);
743
744 if(sc->sc_flags & LP_BYPASS) {
745 /* we can't do writes in bypass mode */
746 return(EPERM);
747 }
748
749 /* request the ppbus only if we don't have it already */
750 /* XXX interrupt registration?! */
751 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
752 return (err);
753
754 /* if interrupts are working, register the handler */
755 if (sc->sc_irq & LP_USE_IRQ) {
756 /* register our interrupt handler */
757 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource,
ee61f228 758 0, lpt_intr, lptdev,
e9cb6d99 759 &sc->intr_cookie, NULL);
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760 if (err) {
761 device_printf(lptdev, "handler registration failed, polled mode.\n");
762 sc->sc_irq &= ~LP_USE_IRQ;
763 }
764 }
765
766 sc->sc_state &= ~INTERRUPTED;
767 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
768 sc->sc_cp = sc->sc_inbuf;
769 uiomove(sc->sc_cp, n, uio);
770 sc->sc_xfercnt = n ;
771
772 if (sc->sc_irq & LP_ENABLE_EXT) {
773 /* try any extended mode */
774 err = ppb_write(ppbus, sc->sc_cp,
775 sc->sc_xfercnt, 0);
776 switch (err) {
777 case 0:
778 /* if not all data was sent, we could rely
779 * on polling for the last bytes */
780 sc->sc_xfercnt = 0;
781 break;
782 case EINTR:
783 sc->sc_state |= INTERRUPTED;
784 return(err);
785 case EINVAL:
786 /* advanced mode not avail */
787 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
788 break;
789 default:
790 return(err);
791 }
792 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
793 lprintf(("i"));
794 /* if the printer is ready for a char, */
795 /* give it one */
796 if ((sc->sc_state & OBUSY) == 0){
797 lprintf(("\nC %d. ", sc->sc_xfercnt));
798 lptintr(lptdev);
799 }
800 lprintf(("W "));
801 if (sc->sc_state & OBUSY)
802 if ((err = tsleep((caddr_t)lptdev,
377d4740 803 PCATCH, LPT_NAME "write", 0))) {
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804 sc->sc_state |= INTERRUPTED;
805 return(err);
806 }
807 }
808
809 /* check to see if we must do a polled write */
810 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
811 lprintf(("p"));
812
813 err = lpt_pushbytes(lptdev);
814
815 if (err)
816 return(err);
817 }
818 }
819
820 /* we have not been interrupted, release the ppbus */
821 lpt_release_ppbus(lptdev);
822
823 return(0);
824}
825
826/*
827 * lpt_intr -- handle printer interrupts which occur when the printer is
828 * ready to accept another char.
829 *
830 * do checking for interrupted write call.
831 */
832
833static void
834lpt_intr(void *arg)
835{
836 device_t lptdev = (device_t)arg;
837 device_t ppbus = device_get_parent(lptdev);
838 struct lpt_data *sc = DEVTOSOFTC(lptdev);
839 int sts = 0;
840 int i;
841
842 /* we must own the bus to use it */
843 if ((sc->sc_state & HAVEBUS) == 0)
844 return;
845
846 /*
847 * Is printer online and ready for output?
848 *
849 * Avoid falling back to lptout() too quickly. First spin-loop
850 * to see if the printer will become ready ``really soon now''.
851 */
852 for (i = 0; i < 100 &&
853 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
854
855 if ((sts & RDY_MASK) == LP_READY) {
856 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
857 sc->sc_backoff = hz/LPTOUTINITIAL;
858
859 if (sc->sc_xfercnt) {
860 /* send char */
861 /*lprintf(("%x ", *sc->sc_cp)); */
862 ppb_wdtr(ppbus, *sc->sc_cp++) ;
863 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
864 /* DELAY(X) */
865 ppb_wctr(ppbus, sc->sc_control);
866
867 /* any more data for printer */
868 if(--(sc->sc_xfercnt) > 0) return;
869 }
870
871 /*
872 * No more data waiting for printer.
873 * Wakeup is not done if write call was not interrupted.
874 */
875 sc->sc_state &= ~OBUSY;
876
877 if(!(sc->sc_state & INTERRUPTED))
878 wakeup((caddr_t)lptdev);
879 lprintf(("w "));
880 return;
881 } else { /* check for error */
882 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
883 (sc->sc_state & OPEN))
884 sc->sc_state |= EERROR;
885 /* lptout() will jump in and try to restart. */
886 }
887 lprintf(("sts %x ", sts));
888}
889
890static void
891lptintr(device_t dev)
892{
893 /* call the interrupt at required spl level */
b28b340f 894 crit_enter();
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895
896 lpt_intr(dev);
897
b28b340f 898 crit_exit();
984263bc
MD
899}
900
901static int
fef8985e 902lptioctl(struct dev_ioctl_args *ap)
984263bc 903{
b13267a5 904 cdev_t dev = ap->a_head.a_dev;
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MD
905 int error = 0;
906 u_int unit = LPTUNIT(minor(dev));
907 struct lpt_data *sc = UNITOSOFTC(unit);
908 u_char old_sc_irq; /* old printer IRQ status */
909
fef8985e 910 switch (ap->a_cmd) {
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911 case LPT_IRQ :
912 if(sc->sc_irq & LP_HAS_IRQ) {
913 /*
914 * NOTE:
915 * If the IRQ status is changed,
916 * this will only be visible on the
917 * next open.
918 *
919 * If interrupt status changes,
920 * this gets syslog'd.
921 */
922 old_sc_irq = sc->sc_irq;
fef8985e 923 switch(*(int*)ap->a_data) {
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924 case 0:
925 sc->sc_irq &= (~LP_ENABLE_IRQ);
926 break;
927 case 1:
928 sc->sc_irq &= (~LP_ENABLE_EXT);
929 sc->sc_irq |= LP_ENABLE_IRQ;
930 break;
931 case 2:
932 /* classic irq based transfer and advanced
933 * modes are in conflict
934 */
935 sc->sc_irq &= (~LP_ENABLE_IRQ);
936 sc->sc_irq |= LP_ENABLE_EXT;
937 break;
938 case 3:
939 sc->sc_irq &= (~LP_ENABLE_EXT);
940 break;
941 default:
942 break;
943 }
944
945 if (old_sc_irq != sc->sc_irq )
946 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
947 unit,
948 (sc->sc_irq & LP_ENABLE_IRQ)?
949 "interrupt-driven":"polled",
950 (sc->sc_irq & LP_ENABLE_EXT)?
951 "extended":"standard");
952 } else /* polled port */
953 error = EOPNOTSUPP;
954 break;
955 default:
956 error = ENODEV;
957 }
958
959 return(error);
960}
961
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MD
962/*
963 * Because lpt is a static device that always exists under a ppbus device,
964 * and not scanned by the ppbus device, we need an identify function to
965 * install its device.
966 */
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967static device_method_t lpt_methods[] = {
968 /* device interface */
39b5d600 969 DEVMETHOD(device_identify, bus_generic_identify),
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970 DEVMETHOD(device_probe, lpt_probe),
971 DEVMETHOD(device_attach, lpt_attach),
972
973 { 0, 0 }
974};
975
976static driver_t lpt_driver = {
977 LPT_NAME,
978 lpt_methods,
979 sizeof(struct lpt_data),
980};
981
982DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);
39b5d600 983