2 * Copyright (c) 1990 William F. Jolitz, TeleMuse
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
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.
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
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 $
52 * $DragonFly: src/sys/dev/misc/lpt/lpt.c,v 1.19 2006/12/22 23:26:17 swildner Exp $
56 * Device Driver for AT parallel printer port
57 * Written by William Jolitz 12/18/90
61 * Updated for ppbus by Nicolas Souchu
67 #include <sys/param.h>
68 #include <sys/systm.h>
69 #include <sys/module.h>
72 #include <sys/device.h>
73 #include <sys/kernel.h>
75 #include <sys/syslog.h>
76 #include <sys/thread2.h>
77 #include <sys/malloc.h>
80 #include <machine/clock.h>
83 #include <bus/ppbus/ppbconf.h>
84 #include <bus/ppbus/ppb_1284.h>
87 #include <bus/ppbus/ppbio.h>
89 MALLOC_DEFINE(M_LPT
, "lpt", "LPT buffers");
94 #define lprintf(args) \
99 static int volatile lptflag
= 1;
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 */
106 #define BUFSTATSIZE 32
108 #define LPTUNIT(s) ((s)&0x03)
109 #define LPTFLAGS(s) ((s)&0xfc)
113 /* default case: negative prime, negative ack, handshake strobe,
117 #define LP_UNITMASK 0x03 /* up to 4 units */
118 #define LP_POS_INIT 0x04 /* if we are a postive 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 */
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 */
136 struct resource
*intr_resource
; /* interrupt resource */
137 void *intr_cookie
; /* interrupt registration cookie */
138 struct callout sc_callout
;
141 #define LPT_NAME "lpt" /* our official name */
143 static timeout_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
);
147 #define DEVTOSOFTC(dev) \
148 ((struct lpt_data *)device_get_softc(dev))
149 #define UNITOSOFTC(unit) \
150 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit)))
151 #define UNITODEVICE(unit) \
152 (devclass_get_device(lpt_devclass, (unit)))
154 static void lptintr(device_t dev
);
155 static void lpt_intr(void *arg
); /* without spls */
157 static devclass_t lpt_devclass
;
161 #define OPEN (1<<0) /* device is open */
162 #define ASLP (1<<1) /* awaiting draining of printer */
163 #define EERROR (1<<2) /* error was received from printer */
164 #define OBUSY (1<<3) /* printer is busy doing output */
165 #define LPTOUT (1<<4) /* timeout while not selected */
166 #define TOUT (1<<5) /* timeout while not selected */
167 #define LPTINIT (1<<6) /* waiting to initialize for open */
168 #define INTERRUPTED (1<<7) /* write call was interrupted */
170 #define HAVEBUS (1<<8) /* the driver owns the bus */
173 /* status masks to interrogate printer status */
174 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
175 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
177 /* Printer Ready condition - from lpa.c */
178 /* Only used in polling code */
179 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
180 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
181 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
183 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
184 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
187 static d_open_t lptopen
;
188 static d_close_t lptclose
;
189 static d_write_t lptwrite
;
190 static d_read_t lptread
;
191 static d_ioctl_t lptioctl
;
193 #define CDEV_MAJOR 16
194 static struct dev_ops lpt_ops
= {
195 { LPT_NAME
, CDEV_MAJOR
, 0 },
204 lpt_request_ppbus(device_t dev
, int how
)
206 device_t ppbus
= device_get_parent(dev
);
207 struct lpt_data
*sc
= DEVTOSOFTC(dev
);
210 if (sc
->sc_state
& HAVEBUS
)
213 /* we have the bus only if the request succeded */
214 if ((error
= ppb_request_bus(ppbus
, dev
, how
)) == 0)
215 sc
->sc_state
|= HAVEBUS
;
221 lpt_release_ppbus(device_t dev
)
223 device_t ppbus
= device_get_parent(dev
);
224 struct lpt_data
*sc
= DEVTOSOFTC(dev
);
227 if ((error
= ppb_release_bus(ppbus
, dev
)) == 0)
228 sc
->sc_state
&= ~HAVEBUS
;
234 * Internal routine to lptprobe to do port tests of one byte value
237 lpt_port_test(device_t ppbus
, u_char data
, u_char mask
)
242 ppb_wdtr(ppbus
, data
);
246 temp
= ppb_rdtr(ppbus
) & mask
;
248 while (temp
!= data
&& --timeout
);
249 lprintf(("out=%x\tin=%x\ttout=%d\n", data
, temp
, timeout
));
250 return (temp
== data
);
254 * Probe simplified by replacing multiple loops with a hardcoded
255 * test pattern - 1999/02/08 des@freebsd.org
257 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
258 * Based partially on Rod Grimes' printer probe
261 * 1) If no port address was given, use the bios detected ports
262 * and autodetect what ports the printers are on.
263 * 2) Otherwise, probe the data port at the address given,
264 * using the method in Rod Grimes' port probe.
265 * (Much code ripped off directly from Rod's probe.)
267 * Comments from Rod's probe:
269 * 1) You should be able to write to and read back the same value
270 * to the data port. Do an alternating zeros, alternating ones,
271 * walking zero, and walking one test to check for stuck bits.
273 * 2) You should be able to write to and read back the same value
274 * to the control port lower 5 bits, the upper 3 bits are reserved
275 * per the IBM PC technical reference manauls and different boards
276 * do different things with them. Do an alternating zeros, alternating
277 * ones, walking zero, and walking one test to check for stuck bits.
279 * Some printers drag the strobe line down when the are powered off
280 * so this bit has been masked out of the control port test.
282 * XXX Some printers may not like a fast pulse on init or strobe, I
283 * don't know at this point, if that becomes a problem these bits
284 * should be turned off in the mask byte for the control port test.
286 * We are finally left with a mask of 0x14, due to some printers
287 * being adamant about holding other bits high ........
289 * Before probing the control port, we write a 0 to the data port -
290 * If not, some printers chuck out garbage when the strobe line
293 * 3) Set the data and control ports to a value of 0
295 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
296 * Epson FX-1170 and C.Itoh 8510RM
298 * Quick exit on fail added.
301 lpt_detect(device_t dev
)
303 device_t ppbus
= device_get_parent(dev
);
305 static u_char testbyte
[18] = {
306 0x55, /* alternating zeros */
307 0xaa, /* alternating ones */
308 0xfe, 0xfd, 0xfb, 0xf7,
309 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
310 0x01, 0x02, 0x04, 0x08,
311 0x10, 0x20, 0x40, 0x80 /* walking one */
313 int i
, error
, status
;
315 status
= 1; /* assume success */
317 if ((error
= lpt_request_ppbus(dev
, PPB_DONTWAIT
))) {
318 kprintf(LPT_NAME
": cannot alloc ppbus (%d)!\n", error
);
323 for (i
= 0; i
< 18 && status
; i
++)
324 if (!lpt_port_test(ppbus
, testbyte
[i
], 0xff)) {
330 /* write 0's to control and data ports */
334 lpt_release_ppbus(dev
);
343 lpt_probe(device_t dev
)
347 sc
= DEVTOSOFTC(dev
);
348 bzero(sc
, sizeof(struct lpt_data
));
351 * Now, try to detect the printer.
353 if (!lpt_detect(dev
))
356 device_set_desc(dev
, "Printer");
362 lpt_attach(device_t dev
)
364 device_t ppbus
= device_get_parent(dev
);
365 struct lpt_data
*sc
= DEVTOSOFTC(dev
);
366 int zero
= 0, unit
= device_get_unit(dev
);
370 sc
->sc_primed
= 0; /* not primed yet */
371 callout_init(&sc
->sc_callout
);
373 if ((error
= lpt_request_ppbus(dev
, PPB_DONTWAIT
))) {
374 kprintf(LPT_NAME
": cannot alloc ppbus (%d)!\n", error
);
378 ppb_wctr(ppbus
, LPC_NINIT
);
380 /* check if we can use interrupt, should be done by ppc stuff */
381 lprintf(("oldirq %x\n", sc
->sc_irq
));
383 /* retrieve the ppbus irq */
384 BUS_READ_IVAR(ppbus
, dev
, PPBUS_IVAR_IRQ
, &irq
);
387 /* declare our interrupt handler */
388 sc
->intr_resource
= bus_alloc_resource(dev
, SYS_RES_IRQ
,
389 &zero
, irq
, irq
, 1, RF_SHAREABLE
);
391 if (sc
->intr_resource
) {
392 sc
->sc_irq
= LP_HAS_IRQ
| LP_USE_IRQ
| LP_ENABLE_IRQ
;
393 device_printf(dev
, "Interrupt-driven port\n");
396 device_printf(dev
, "Polled port\n");
398 lprintf(("irq %x %x\n", irq
, sc
->sc_irq
));
400 lpt_release_ppbus(dev
);
402 make_dev(&lpt_ops
, unit
, UID_ROOT
, GID_WHEEL
,
403 0600, LPT_NAME
"%d", unit
);
404 make_dev(&lpt_ops
, unit
| LP_BYPASS
, UID_ROOT
, GID_WHEEL
,
405 0600, LPT_NAME
"%d.ctl", unit
);
412 device_t dev
= (device_t
)arg
;
413 struct lpt_data
*sc
= DEVTOSOFTC(dev
);
415 device_t ppbus
= device_get_parent(dev
);
418 lprintf(("T %x ", ppb_rstr(ppbus
)));
419 if (sc
->sc_state
& OPEN
) {
421 if (sc
->sc_backoff
> hz
/LPTOUTMAX
)
422 sc
->sc_backoff
= sc
->sc_backoff
> hz
/LPTOUTMAX
;
423 callout_reset(&sc
->sc_callout
, sc
->sc_backoff
, lptout
, dev
);
425 sc
->sc_state
&= ~TOUT
;
428 if (sc
->sc_state
& EERROR
)
429 sc
->sc_state
&= ~EERROR
;
432 * Avoid possible hangs due to missed interrupts
434 if (sc
->sc_xfercnt
) {
437 sc
->sc_state
&= ~OBUSY
;
438 wakeup((caddr_t
)dev
);
443 * lptopen -- reset the printer, then wait until it's selected and not busy.
444 * If LP_BYPASS flag is selected, then we do not try to select the
445 * printer -- this is just used for passing ioctls.
449 lptopen(struct dev_open_args
*ap
)
451 cdev_t dev
= ap
->a_head
.a_dev
;
453 u_int unit
= LPTUNIT(minor(dev
));
454 struct lpt_data
*sc
= UNITOSOFTC(unit
);
455 device_t lptdev
= UNITODEVICE(unit
);
456 device_t ppbus
= device_get_parent(lptdev
);
462 lprintf((LPT_NAME
": still open %x\n", sc
->sc_state
));
465 sc
->sc_state
|= LPTINIT
;
467 sc
->sc_flags
= LPTFLAGS(minor(dev
));
469 /* Check for open with BYPASS flag set. */
470 if (sc
->sc_flags
& LP_BYPASS
) {
475 /* request the ppbus only if we don't have it already */
476 if ((err
= lpt_request_ppbus(lptdev
, PPB_WAIT
|PPB_INTR
)) != 0) {
477 /* give it a chance to try later */
483 lprintf((LPT_NAME
" flags 0x%x\n", sc
->sc_flags
));
485 /* set IRQ status according to ENABLE_IRQ flag
487 if (sc
->sc_irq
& LP_ENABLE_IRQ
)
488 sc
->sc_irq
|= LP_USE_IRQ
;
490 sc
->sc_irq
&= ~LP_USE_IRQ
;
493 if ((sc
->sc_flags
& LP_NO_PRIME
) == 0) {
494 if((sc
->sc_flags
& LP_PRIMEOPEN
) || sc
->sc_primed
== 0) {
501 ppb_wctr(ppbus
, LPC_SEL
|LPC_NINIT
);
503 /* wait till ready (printer running diagnostics) */
506 /* ran out of waiting for the printer */
507 if (trys
++ >= LPINITRDY
*4) {
510 lprintf(("status %x\n", ppb_rstr(ppbus
)));
512 lpt_release_ppbus(lptdev
);
516 /* wait 1/4 second, give up if we get a signal */
517 if (tsleep((caddr_t
)lptdev
, PCATCH
, "lptinit", hz
/4) !=
522 lpt_release_ppbus(lptdev
);
526 /* is printer online and ready for output */
527 } while ((ppb_rstr(ppbus
) &
528 (LPS_SEL
|LPS_OUT
|LPS_NBSY
|LPS_NERR
)) !=
529 (LPS_SEL
|LPS_NBSY
|LPS_NERR
));
531 sc
->sc_control
= LPC_SEL
|LPC_NINIT
;
532 if (sc
->sc_flags
& LP_AUTOLF
)
533 sc
->sc_control
|= LPC_AUTOL
;
535 /* enable interrupt if interrupt-driven */
536 if (sc
->sc_irq
& LP_USE_IRQ
)
537 sc
->sc_control
|= LPC_ENA
;
539 ppb_wctr(ppbus
, sc
->sc_control
);
542 sc
->sc_inbuf
= kmalloc(BUFSIZE
, M_LPT
, M_WAITOK
);
543 sc
->sc_statbuf
= kmalloc(BUFSTATSIZE
, M_LPT
, M_WAITOK
);
548 /* release the ppbus */
549 lpt_release_ppbus(lptdev
);
551 /* only use timeout if using interrupt */
552 lprintf(("irq %x\n", sc
->sc_irq
));
553 if (sc
->sc_irq
& LP_USE_IRQ
) {
554 sc
->sc_state
|= TOUT
;
555 sc
->sc_backoff
= hz
/ LPTOUTINITIAL
;
556 callout_reset(&sc
->sc_callout
, sc
->sc_backoff
, lptout
, lptdev
);
559 lprintf(("opened.\n"));
564 * lptclose -- close the device, free the local line buffer.
566 * Check for interrupted write call added.
570 lptclose(struct dev_close_args
*ap
)
572 cdev_t dev
= ap
->a_head
.a_dev
;
573 u_int unit
= LPTUNIT(minor(dev
));
574 struct lpt_data
*sc
= UNITOSOFTC(unit
);
575 device_t lptdev
= UNITODEVICE(unit
);
576 device_t ppbus
= device_get_parent(lptdev
);
579 if(sc
->sc_flags
& LP_BYPASS
)
582 if ((err
= lpt_request_ppbus(lptdev
, PPB_WAIT
|PPB_INTR
)) != 0)
585 sc
->sc_state
&= ~OPEN
;
587 /* if the last write was interrupted, don't complete it */
588 if((!(sc
->sc_state
& INTERRUPTED
)) && (sc
->sc_irq
& LP_USE_IRQ
)) {
589 while ((ppb_rstr(ppbus
) &
590 (LPS_SEL
|LPS_OUT
|LPS_NBSY
|LPS_NERR
)) !=
591 (LPS_SEL
|LPS_NBSY
|LPS_NERR
) || sc
->sc_xfercnt
) {
592 /* wait 1/4 second, give up if we get a signal */
593 if (tsleep((caddr_t
)lptdev
, PCATCH
,
594 "lpclose", hz
) != EWOULDBLOCK
) {
599 callout_stop(&sc
->sc_callout
);
600 ppb_wctr(ppbus
, LPC_NINIT
);
601 kfree(sc
->sc_inbuf
, M_LPT
);
602 kfree(sc
->sc_statbuf
, M_LPT
);
605 /* release the bus anyway
606 * unregistration of interrupt forced by release
608 lpt_release_ppbus(lptdev
);
612 lprintf(("closed.\n"));
618 * Workhorse for actually spinning and writing bytes to printer
622 * This code is only used when we are polling the port
625 lpt_pushbytes(device_t dev
)
627 struct lpt_data
*sc
= DEVTOSOFTC(dev
);
628 device_t ppbus
= device_get_parent(dev
);
633 /* loop for every character .. */
634 while (sc
->sc_xfercnt
> 0) {
641 * Wait for printer ready.
642 * Loop 20 usecs testing BUSY bit, then sleep
643 * for exponentially increasing timeout. (vak)
645 for (spin
= 0; NOT_READY(ppbus
) && spin
< MAX_SPIN
; ++spin
)
646 DELAY(1); /* XXX delay is NOT this accurate! */
647 if (spin
>= MAX_SPIN
) {
649 while (NOT_READY(ppbus
)) {
651 * Now sleep, every cycle a
656 * But no more than 10 seconds. (vak)
660 err
= tsleep((caddr_t
)dev
, 0,
661 LPT_NAME
"poll", tic
);
662 if (err
!= EWOULDBLOCK
) {
671 ppb_wctr(ppbus
, sc
->sc_control
|LPC_STB
);
672 ppb_wctr(ppbus
, sc
->sc_control
);
679 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
683 lptread(struct dev_read_args
*ap
)
685 cdev_t dev
= ap
->a_head
.a_dev
;
686 struct uio
*uio
= ap
->a_uio
;
687 u_int unit
= LPTUNIT(minor(dev
));
688 struct lpt_data
*sc
= UNITOSOFTC(unit
);
689 device_t lptdev
= UNITODEVICE(unit
);
690 device_t ppbus
= device_get_parent(lptdev
);
693 if (sc
->sc_flags
& LP_BYPASS
) {
694 /* we can't do reads in bypass mode */
698 if ((error
= ppb_1284_negociate(ppbus
, PPB_NIBBLE
, 0)))
701 /* read data in an other buffer, read/write may be simultaneous */
703 while (uio
->uio_resid
) {
704 error
= ppb_1284_read(ppbus
, PPB_NIBBLE
, sc
->sc_statbuf
,
705 (int)szmin(BUFSTATSIZE
, uio
->uio_resid
),
711 goto error
; /* no more data */
713 if ((error
= uiomove(sc
->sc_statbuf
, (size_t)len
, uio
)))
718 ppb_1284_terminate(ppbus
);
723 * lptwrite --copy a line from user space to a local buffer, then call
724 * putc to get the chars moved to the output queue.
726 * Flagging of interrupted write added.
730 lptwrite(struct dev_write_args
*ap
)
732 cdev_t dev
= ap
->a_head
.a_dev
;
733 struct uio
*uio
= ap
->a_uio
;
736 u_int unit
= LPTUNIT(minor(dev
));
737 struct lpt_data
*sc
= UNITOSOFTC(unit
);
738 device_t lptdev
= UNITODEVICE(unit
);
739 device_t ppbus
= device_get_parent(lptdev
);
741 if(sc
->sc_flags
& LP_BYPASS
) {
742 /* we can't do writes in bypass mode */
746 /* request the ppbus only if we don't have it already */
747 /* XXX interrupt registration?! */
748 if ((err
= lpt_request_ppbus(lptdev
, PPB_WAIT
|PPB_INTR
)) != 0)
751 /* if interrupts are working, register the handler */
752 if (sc
->sc_irq
& LP_USE_IRQ
) {
753 /* register our interrupt handler */
754 err
= BUS_SETUP_INTR(ppbus
, lptdev
, sc
->intr_resource
,
756 &sc
->intr_cookie
, NULL
);
758 device_printf(lptdev
, "handler registration failed, polled mode.\n");
759 sc
->sc_irq
&= ~LP_USE_IRQ
;
763 sc
->sc_state
&= ~INTERRUPTED
;
764 while ((n
= (unsigned)szmin(BUFSIZE
, uio
->uio_resid
)) != 0) {
765 sc
->sc_cp
= sc
->sc_inbuf
;
766 uiomove(sc
->sc_cp
, (size_t)n
, uio
);
769 if (sc
->sc_irq
& LP_ENABLE_EXT
) {
770 /* try any extended mode */
771 err
= ppb_write(ppbus
, sc
->sc_cp
,
775 /* if not all data was sent, we could rely
776 * on polling for the last bytes */
780 sc
->sc_state
|= INTERRUPTED
;
783 /* advanced mode not avail */
784 log(LOG_NOTICE
, LPT_NAME
"%d: advanced mode not avail, polling\n", unit
);
789 } else while ((sc
->sc_xfercnt
> 0)&&(sc
->sc_irq
& LP_USE_IRQ
)) {
791 /* if the printer is ready for a char, */
793 if ((sc
->sc_state
& OBUSY
) == 0){
794 lprintf(("\nC %d. ", sc
->sc_xfercnt
));
798 if (sc
->sc_state
& OBUSY
)
799 if ((err
= tsleep((caddr_t
)lptdev
,
800 PCATCH
, LPT_NAME
"write", 0))) {
801 sc
->sc_state
|= INTERRUPTED
;
806 /* check to see if we must do a polled write */
807 if(!(sc
->sc_irq
& LP_USE_IRQ
) && (sc
->sc_xfercnt
)) {
810 err
= lpt_pushbytes(lptdev
);
817 /* we have not been interrupted, release the ppbus */
818 lpt_release_ppbus(lptdev
);
824 * lpt_intr -- handle printer interrupts which occur when the printer is
825 * ready to accept another char.
827 * do checking for interrupted write call.
833 device_t lptdev
= (device_t
)arg
;
834 device_t ppbus
= device_get_parent(lptdev
);
835 struct lpt_data
*sc
= DEVTOSOFTC(lptdev
);
839 /* we must own the bus to use it */
840 if ((sc
->sc_state
& HAVEBUS
) == 0)
844 * Is printer online and ready for output?
846 * Avoid falling back to lptout() too quickly. First spin-loop
847 * to see if the printer will become ready ``really soon now''.
849 for (i
= 0; i
< 100 &&
850 ((sts
=ppb_rstr(ppbus
)) & RDY_MASK
) != LP_READY
; i
++) ;
852 if ((sts
& RDY_MASK
) == LP_READY
) {
853 sc
->sc_state
= (sc
->sc_state
| OBUSY
) & ~EERROR
;
854 sc
->sc_backoff
= hz
/LPTOUTINITIAL
;
856 if (sc
->sc_xfercnt
) {
858 /*lprintf(("%x ", *sc->sc_cp)); */
859 ppb_wdtr(ppbus
, *sc
->sc_cp
++) ;
860 ppb_wctr(ppbus
, sc
->sc_control
|LPC_STB
);
862 ppb_wctr(ppbus
, sc
->sc_control
);
864 /* any more data for printer */
865 if(--(sc
->sc_xfercnt
) > 0) return;
869 * No more data waiting for printer.
870 * Wakeup is not done if write call was not interrupted.
872 sc
->sc_state
&= ~OBUSY
;
874 if(!(sc
->sc_state
& INTERRUPTED
))
875 wakeup((caddr_t
)lptdev
);
878 } else { /* check for error */
879 if(((sts
& (LPS_NERR
| LPS_OUT
) ) != LPS_NERR
) &&
880 (sc
->sc_state
& OPEN
))
881 sc
->sc_state
|= EERROR
;
882 /* lptout() will jump in and try to restart. */
884 lprintf(("sts %x ", sts
));
888 lptintr(device_t dev
)
890 /* call the interrupt at required spl level */
899 lptioctl(struct dev_ioctl_args
*ap
)
901 cdev_t dev
= ap
->a_head
.a_dev
;
903 u_int unit
= LPTUNIT(minor(dev
));
904 struct lpt_data
*sc
= UNITOSOFTC(unit
);
905 u_char old_sc_irq
; /* old printer IRQ status */
909 if(sc
->sc_irq
& LP_HAS_IRQ
) {
912 * If the IRQ status is changed,
913 * this will only be visible on the
916 * If interrupt status changes,
917 * this gets syslog'd.
919 old_sc_irq
= sc
->sc_irq
;
920 switch(*(int*)ap
->a_data
) {
922 sc
->sc_irq
&= (~LP_ENABLE_IRQ
);
925 sc
->sc_irq
&= (~LP_ENABLE_EXT
);
926 sc
->sc_irq
|= LP_ENABLE_IRQ
;
929 /* classic irq based transfer and advanced
930 * modes are in conflict
932 sc
->sc_irq
&= (~LP_ENABLE_IRQ
);
933 sc
->sc_irq
|= LP_ENABLE_EXT
;
936 sc
->sc_irq
&= (~LP_ENABLE_EXT
);
942 if (old_sc_irq
!= sc
->sc_irq
)
943 log(LOG_NOTICE
, LPT_NAME
"%d: switched to %s %s mode\n",
945 (sc
->sc_irq
& LP_ENABLE_IRQ
)?
946 "interrupt-driven":"polled",
947 (sc
->sc_irq
& LP_ENABLE_EXT
)?
948 "extended":"standard");
949 } else /* polled port */
960 * Because lpt is a static device that always exists under a ppbus device,
961 * and not scanned by the ppbus device, we need an identify function to
962 * install its device.
964 static device_method_t lpt_methods
[] = {
965 /* device interface */
966 DEVMETHOD(device_identify
, bus_generic_identify
),
967 DEVMETHOD(device_probe
, lpt_probe
),
968 DEVMETHOD(device_attach
, lpt_attach
),
973 static driver_t lpt_driver
= {
976 sizeof(struct lpt_data
),
979 DRIVER_MODULE(lpt
, ppbus
, lpt_driver
, lpt_devclass
, 0, 0);