/* * Copyright (c) 1990 William F. Jolitz, TeleMuse * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This software is a component of "386BSD" developed by * William F. Jolitz, TeleMuse. * 4. Neither the name of the developer nor the name "386BSD" * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT * NOT MAKE USE OF THIS WORK. * * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. * * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: unknown origin, 386BSD 0.1 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp * $FreeBSD: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $ */ /* * Device Driver for AT parallel printer port * Written by William Jolitz 12/18/90 */ /* * Updated for ppbus by Nicolas Souchu * [Mon Jul 28 1997] */ #include "opt_lpt.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "lptio.h" #include #include #include "lpt.h" #include "ppbus_if.h" #include MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); #ifndef LPT_DEBUG #define lprintf(args) #else #define lprintf(args) \ do { \ if (lptflag) \ kprintf args; \ } while (0) static int volatile lptflag = 1; #endif #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ #define LPTOUTMAX 1 /* maximal timeout 1 s */ #define BUFSIZE 1024 #define BUFSTATSIZE 32 #define LPTUNIT(s) ((s)&0x03) #define LPTFLAGS(s) ((s)&0xfc) struct lpt_data { short sc_state; /* default case: negative prime, negative ack, handshake strobe, prime once */ u_char sc_control; char sc_flags; #define LP_UNITMASK 0x03 /* up to 4 units */ #define LP_POS_INIT 0x04 /* if we are a postive init signal */ #define LP_POS_ACK 0x08 /* if we are a positive going ack */ #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ #define LP_PRIMEOPEN 0x20 /* prime on every open */ #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ #define LP_BYPASS 0x80 /* bypass printer ready checks */ void *sc_inbuf; void *sc_statbuf; short sc_xfercnt ; char sc_primed; char *sc_cp ; u_short sc_irq ; /* IRQ status of port */ #define LP_HAS_IRQ 0x01 /* we have an irq available */ #define LP_USE_IRQ 0x02 /* we are using our irq */ #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ u_char sc_backoff ; /* time to call lptout() again */ struct resource *intr_resource; /* interrupt resource */ void *intr_cookie; /* interrupt registration cookie */ struct callout sc_callout; }; #define LPT_NAME "lpt" /* our official name */ static timeout_t lptout; static int lpt_port_test(device_t dev, u_char data, u_char mask); static int lpt_detect(device_t dev); #define DEVTOSOFTC(dev) \ ((struct lpt_data *)device_get_softc(dev)) #define UNITOSOFTC(unit) \ ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) #define UNITODEVICE(unit) \ (devclass_get_device(lpt_devclass, (unit))) static void lptintr(device_t dev); static void lpt_intr(void *arg); /* without spls */ static devclass_t lpt_devclass; /* bits for state */ #define OPEN (1<<0) /* device is open */ #define ASLP (1<<1) /* awaiting draining of printer */ #define EERROR (1<<2) /* error was received from printer */ #define OBUSY (1<<3) /* printer is busy doing output */ #define LPTOUT (1<<4) /* timeout while not selected */ #define TOUT (1<<5) /* timeout while not selected */ #define LPTINIT (1<<6) /* waiting to initialize for open */ #define INTERRUPTED (1<<7) /* write call was interrupted */ #define HAVEBUS (1<<8) /* the driver owns the bus */ /* status masks to interrogate printer status */ #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) /* Printer Ready condition - from lpa.c */ /* Only used in polling code */ #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ #define MAX_SPIN 20 /* Max delay for device ready in usecs */ static d_open_t lptopen; static d_close_t lptclose; static d_write_t lptwrite; static d_read_t lptread; static d_ioctl_t lptioctl; static struct dev_ops lpt_ops = { { LPT_NAME, 0, 0 }, .d_open = lptopen, .d_close = lptclose, .d_read = lptread, .d_write = lptwrite, .d_ioctl = lptioctl, }; static int lpt_request_ppbus(device_t dev, int how) { device_t ppbus = device_get_parent(dev); struct lpt_data *sc = DEVTOSOFTC(dev); int error; if (sc->sc_state & HAVEBUS) return (0); /* we have the bus only if the request succeded */ if ((error = ppb_request_bus(ppbus, dev, how)) == 0) sc->sc_state |= HAVEBUS; return (error); } static int lpt_release_ppbus(device_t dev) { device_t ppbus = device_get_parent(dev); struct lpt_data *sc = DEVTOSOFTC(dev); int error = 0; if ((error = ppb_release_bus(ppbus, dev)) == 0) sc->sc_state &= ~HAVEBUS; return (error); } /* * Internal routine to lptprobe to do port tests of one byte value */ static int lpt_port_test(device_t ppbus, u_char data, u_char mask) { int temp, timeout; data = data & mask; ppb_wdtr(ppbus, data); timeout = 10000; do { DELAY(10); temp = ppb_rdtr(ppbus) & mask; } while (temp != data && --timeout); lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); return (temp == data); } /* * Probe simplified by replacing multiple loops with a hardcoded * test pattern - 1999/02/08 des@freebsd.org * * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 * Based partially on Rod Grimes' printer probe * * Logic: * 1) If no port address was given, use the bios detected ports * and autodetect what ports the printers are on. * 2) Otherwise, probe the data port at the address given, * using the method in Rod Grimes' port probe. * (Much code ripped off directly from Rod's probe.) * * Comments from Rod's probe: * Logic: * 1) You should be able to write to and read back the same value * to the data port. Do an alternating zeros, alternating ones, * walking zero, and walking one test to check for stuck bits. * * 2) You should be able to write to and read back the same value * to the control port lower 5 bits, the upper 3 bits are reserved * per the IBM PC technical reference manauls and different boards * do different things with them. Do an alternating zeros, alternating * ones, walking zero, and walking one test to check for stuck bits. * * Some printers drag the strobe line down when the are powered off * so this bit has been masked out of the control port test. * * XXX Some printers may not like a fast pulse on init or strobe, I * don't know at this point, if that becomes a problem these bits * should be turned off in the mask byte for the control port test. * * We are finally left with a mask of 0x14, due to some printers * being adamant about holding other bits high ........ * * Before probing the control port, we write a 0 to the data port - * If not, some printers chuck out garbage when the strobe line * gets toggled. * * 3) Set the data and control ports to a value of 0 * * This probe routine has been tested on Epson Lx-800, HP LJ3P, * Epson FX-1170 and C.Itoh 8510RM * printers. * Quick exit on fail added. */ static int lpt_detect(device_t dev) { device_t ppbus = device_get_parent(dev); static u_char testbyte[18] = { 0x55, /* alternating zeros */ 0xaa, /* alternating ones */ 0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 /* walking one */ }; int i, error, status; status = 1; /* assume success */ if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); status = 0; goto end_probe; } for (i = 0; i < 18 && status; i++) if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { status = 0; goto end_probe; } end_probe: /* write 0's to control and data ports */ ppb_wdtr(ppbus, 0); ppb_wctr(ppbus, 0); lpt_release_ppbus(dev); return (status); } /* * lpt_probe() */ static int lpt_probe(device_t dev) { struct lpt_data *sc; sc = DEVTOSOFTC(dev); bzero(sc, sizeof(struct lpt_data)); /* * Now, try to detect the printer. */ if (!lpt_detect(dev)) return (ENXIO); device_set_desc(dev, "Printer"); return (0); } static int lpt_attach(device_t dev) { device_t ppbus = device_get_parent(dev); struct lpt_data *sc = DEVTOSOFTC(dev); int zero = 0, unit = device_get_unit(dev); int error; uintptr_t irq; sc->sc_primed = 0; /* not primed yet */ callout_init(&sc->sc_callout); if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); return (0); } ppb_wctr(ppbus, LPC_NINIT); /* check if we can use interrupt, should be done by ppc stuff */ lprintf(("oldirq %x\n", sc->sc_irq)); /* retrieve the ppbus irq */ BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); if (irq > 0) { /* declare our interrupt handler */ sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1, RF_SHAREABLE); } if (sc->intr_resource) { sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; device_printf(dev, "Interrupt-driven port\n"); } else { sc->sc_irq = 0; device_printf(dev, "Polled port\n"); } lprintf(("irq %"PRIxPTR" %x\n", irq, sc->sc_irq)); lpt_release_ppbus(dev); make_dev(&lpt_ops, unit, UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); make_dev(&lpt_ops, unit | LP_BYPASS, UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); return (0); } static void lptout(void *arg) { device_t dev = (device_t)arg; struct lpt_data *sc = DEVTOSOFTC(dev); #ifdef LPT_DEBUG device_t ppbus = device_get_parent(dev); #endif lprintf(("T %x ", ppb_rstr(ppbus))); if (sc->sc_state & OPEN) { sc->sc_backoff++; if (sc->sc_backoff > hz/LPTOUTMAX) sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); } else { sc->sc_state &= ~TOUT; } if (sc->sc_state & EERROR) sc->sc_state &= ~EERROR; /* * Avoid possible hangs due to missed interrupts */ if (sc->sc_xfercnt) { lptintr(dev); } else { sc->sc_state &= ~OBUSY; wakeup((caddr_t)dev); } } /* * lptopen -- reset the printer, then wait until it's selected and not busy. * If LP_BYPASS flag is selected, then we do not try to select the * printer -- this is just used for passing ioctls. */ static int lptopen(struct dev_open_args *ap) { cdev_t dev = ap->a_head.a_dev; int trys, err; u_int unit = LPTUNIT(minor(dev)); struct lpt_data *sc = UNITOSOFTC(unit); device_t lptdev = UNITODEVICE(unit); device_t ppbus = device_get_parent(lptdev); if (!sc) return (ENXIO); if (sc->sc_state) { lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); return(EBUSY); } else sc->sc_state |= LPTINIT; sc->sc_flags = LPTFLAGS(minor(dev)); /* Check for open with BYPASS flag set. */ if (sc->sc_flags & LP_BYPASS) { sc->sc_state = OPEN; return(0); } /* request the ppbus only if we don't have it already */ if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { /* give it a chance to try later */ sc->sc_state = 0; return (err); } crit_enter(); lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); /* set IRQ status according to ENABLE_IRQ flag */ if (sc->sc_irq & LP_ENABLE_IRQ) sc->sc_irq |= LP_USE_IRQ; else sc->sc_irq &= ~LP_USE_IRQ; /* init printer */ if ((sc->sc_flags & LP_NO_PRIME) == 0) { if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { ppb_wctr(ppbus, 0); sc->sc_primed++; DELAY(500); } } ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); /* wait till ready (printer running diagnostics) */ trys = 0; do { /* ran out of waiting for the printer */ if (trys++ >= LPINITRDY*4) { crit_exit(); sc->sc_state = 0; lprintf(("status %x\n", ppb_rstr(ppbus))); lpt_release_ppbus(lptdev); return (EBUSY); } /* wait 1/4 second, give up if we get a signal */ if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != EWOULDBLOCK) { sc->sc_state = 0; crit_exit(); lpt_release_ppbus(lptdev); return (EBUSY); } /* is printer online and ready for output */ } while ((ppb_rstr(ppbus) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != (LPS_SEL|LPS_NBSY|LPS_NERR)); sc->sc_control = LPC_SEL|LPC_NINIT; if (sc->sc_flags & LP_AUTOLF) sc->sc_control |= LPC_AUTOL; /* enable interrupt if interrupt-driven */ if (sc->sc_irq & LP_USE_IRQ) sc->sc_control |= LPC_ENA; ppb_wctr(ppbus, sc->sc_control); sc->sc_state = OPEN; sc->sc_inbuf = kmalloc(BUFSIZE, M_LPT, M_WAITOK); sc->sc_statbuf = kmalloc(BUFSTATSIZE, M_LPT, M_WAITOK); sc->sc_xfercnt = 0; crit_exit(); /* release the ppbus */ lpt_release_ppbus(lptdev); /* only use timeout if using interrupt */ lprintf(("irq %x\n", sc->sc_irq)); if (sc->sc_irq & LP_USE_IRQ) { sc->sc_state |= TOUT; sc->sc_backoff = hz / LPTOUTINITIAL; callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); } lprintf(("opened.\n")); return(0); } /* * lptclose -- close the device, free the local line buffer. * * Check for interrupted write call added. */ static int lptclose(struct dev_close_args *ap) { cdev_t dev = ap->a_head.a_dev; u_int unit = LPTUNIT(minor(dev)); struct lpt_data *sc = UNITOSOFTC(unit); device_t lptdev = UNITODEVICE(unit); device_t ppbus = device_get_parent(lptdev); int err; if(sc->sc_flags & LP_BYPASS) goto end_close; if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) return (err); sc->sc_state &= ~OPEN; /* if the last write was interrupted, don't complete it */ if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { while ((ppb_rstr(ppbus) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { /* wait 1/4 second, give up if we get a signal */ if (tsleep((caddr_t)lptdev, PCATCH, "lpclose", hz) != EWOULDBLOCK) { break; } } } callout_stop(&sc->sc_callout); ppb_wctr(ppbus, LPC_NINIT); kfree(sc->sc_inbuf, M_LPT); kfree(sc->sc_statbuf, M_LPT); end_close: /* release the bus anyway * unregistration of interrupt forced by release */ lpt_release_ppbus(lptdev); sc->sc_state = 0; sc->sc_xfercnt = 0; lprintf(("closed.\n")); return(0); } /* * lpt_pushbytes() * Workhorse for actually spinning and writing bytes to printer * Derived from lpa.c * Originally by ? * * This code is only used when we are polling the port */ static int lpt_pushbytes(device_t dev) { struct lpt_data *sc = DEVTOSOFTC(dev); device_t ppbus = device_get_parent(dev); int spin, err, tic; char ch; lprintf(("p")); /* loop for every character .. */ while (sc->sc_xfercnt > 0) { /* printer data */ ch = *(sc->sc_cp); sc->sc_cp++; sc->sc_xfercnt--; /* * Wait for printer ready. * Loop 20 usecs testing BUSY bit, then sleep * for exponentially increasing timeout. (vak) */ for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) DELAY(1); /* XXX delay is NOT this accurate! */ if (spin >= MAX_SPIN) { tic = 0; while (NOT_READY(ppbus)) { /* * Now sleep, every cycle a * little longer .. */ tic = tic + tic + 1; /* * But no more than 10 seconds. (vak) */ if (tic > MAX_SLEEP) tic = MAX_SLEEP; err = tsleep((caddr_t)dev, 0, LPT_NAME "poll", tic); if (err != EWOULDBLOCK) { return (err); } } } /* output data */ ppb_wdtr(ppbus, ch); /* strobe */ ppb_wctr(ppbus, sc->sc_control|LPC_STB); ppb_wctr(ppbus, sc->sc_control); } return(0); } /* * lptread --retrieve printer status in IEEE1284 NIBBLE mode */ static int lptread(struct dev_read_args *ap) { cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; u_int unit = LPTUNIT(minor(dev)); struct lpt_data *sc = UNITOSOFTC(unit); device_t lptdev = UNITODEVICE(unit); device_t ppbus = device_get_parent(lptdev); int error = 0, len; if (sc->sc_flags & LP_BYPASS) { /* we can't do reads in bypass mode */ return (EPERM); } if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) return (error); /* read data in an other buffer, read/write may be simultaneous */ len = 0; while (uio->uio_resid) { error = ppb_1284_read(ppbus, PPB_NIBBLE, sc->sc_statbuf, (int)szmin(BUFSTATSIZE, uio->uio_resid), &len); if (error) goto error; if (!len) goto error; /* no more data */ if ((error = uiomove(sc->sc_statbuf, (size_t)len, uio))) goto error; } error: ppb_1284_terminate(ppbus); return (error); } /* * lptwrite --copy a line from user space to a local buffer, then call * putc to get the chars moved to the output queue. * * Flagging of interrupted write added. */ static int lptwrite(struct dev_write_args *ap) { cdev_t dev = ap->a_head.a_dev; struct uio *uio = ap->a_uio; unsigned n; int err; u_int unit = LPTUNIT(minor(dev)); struct lpt_data *sc = UNITOSOFTC(unit); device_t lptdev = UNITODEVICE(unit); device_t ppbus = device_get_parent(lptdev); if(sc->sc_flags & LP_BYPASS) { /* we can't do writes in bypass mode */ return(EPERM); } /* request the ppbus only if we don't have it already */ /* XXX interrupt registration?! */ if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) return (err); /* if interrupts are working, register the handler */ if (sc->sc_irq & LP_USE_IRQ) { /* register our interrupt handler */ err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 0, lpt_intr, lptdev, &sc->intr_cookie, NULL); if (err) { device_printf(lptdev, "handler registration failed, polled mode.\n"); sc->sc_irq &= ~LP_USE_IRQ; } } sc->sc_state &= ~INTERRUPTED; while ((n = (unsigned)szmin(BUFSIZE, uio->uio_resid)) != 0) { sc->sc_cp = sc->sc_inbuf; uiomove(sc->sc_cp, (size_t)n, uio); sc->sc_xfercnt = n ; if (sc->sc_irq & LP_ENABLE_EXT) { /* try any extended mode */ err = ppb_write(ppbus, sc->sc_cp, sc->sc_xfercnt, 0); switch (err) { case 0: /* if not all data was sent, we could rely * on polling for the last bytes */ sc->sc_xfercnt = 0; break; case EINTR: sc->sc_state |= INTERRUPTED; return(err); case EINVAL: /* advanced mode not avail */ log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); break; default: return(err); } } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { lprintf(("i")); /* if the printer is ready for a char, */ /* give it one */ if ((sc->sc_state & OBUSY) == 0){ lprintf(("\nC %d. ", sc->sc_xfercnt)); lptintr(lptdev); } lprintf(("W ")); if (sc->sc_state & OBUSY) if ((err = tsleep((caddr_t)lptdev, PCATCH, LPT_NAME "write", 0))) { sc->sc_state |= INTERRUPTED; return(err); } } /* check to see if we must do a polled write */ if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { lprintf(("p")); err = lpt_pushbytes(lptdev); if (err) return(err); } } /* we have not been interrupted, release the ppbus */ lpt_release_ppbus(lptdev); return(0); } /* * lpt_intr -- handle printer interrupts which occur when the printer is * ready to accept another char. * * do checking for interrupted write call. */ static void lpt_intr(void *arg) { device_t lptdev = (device_t)arg; device_t ppbus = device_get_parent(lptdev); struct lpt_data *sc = DEVTOSOFTC(lptdev); int sts = 0; int i; /* we must own the bus to use it */ if ((sc->sc_state & HAVEBUS) == 0) return; /* * Is printer online and ready for output? * * Avoid falling back to lptout() too quickly. First spin-loop * to see if the printer will become ready ``really soon now''. */ for (i = 0; i < 100 && ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; if ((sts & RDY_MASK) == LP_READY) { sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; sc->sc_backoff = hz/LPTOUTINITIAL; if (sc->sc_xfercnt) { /* send char */ /*lprintf(("%x ", *sc->sc_cp)); */ ppb_wdtr(ppbus, *sc->sc_cp++) ; ppb_wctr(ppbus, sc->sc_control|LPC_STB); /* DELAY(X) */ ppb_wctr(ppbus, sc->sc_control); /* any more data for printer */ if(--(sc->sc_xfercnt) > 0) return; } /* * No more data waiting for printer. * Wakeup is not done if write call was not interrupted. */ sc->sc_state &= ~OBUSY; if(!(sc->sc_state & INTERRUPTED)) wakeup((caddr_t)lptdev); lprintf(("w ")); return; } else { /* check for error */ if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && (sc->sc_state & OPEN)) sc->sc_state |= EERROR; /* lptout() will jump in and try to restart. */ } lprintf(("sts %x ", sts)); } static void lptintr(device_t dev) { /* call the interrupt at required spl level */ crit_enter(); lpt_intr(dev); crit_exit(); } static int lptioctl(struct dev_ioctl_args *ap) { cdev_t dev = ap->a_head.a_dev; int error = 0; u_int unit = LPTUNIT(minor(dev)); struct lpt_data *sc = UNITOSOFTC(unit); u_char old_sc_irq; /* old printer IRQ status */ switch (ap->a_cmd) { case LPT_IRQ : if(sc->sc_irq & LP_HAS_IRQ) { /* * NOTE: * If the IRQ status is changed, * this will only be visible on the * next open. * * If interrupt status changes, * this gets syslog'd. */ old_sc_irq = sc->sc_irq; switch(*(int*)ap->a_data) { case 0: sc->sc_irq &= (~LP_ENABLE_IRQ); break; case 1: sc->sc_irq &= (~LP_ENABLE_EXT); sc->sc_irq |= LP_ENABLE_IRQ; break; case 2: /* classic irq based transfer and advanced * modes are in conflict */ sc->sc_irq &= (~LP_ENABLE_IRQ); sc->sc_irq |= LP_ENABLE_EXT; break; case 3: sc->sc_irq &= (~LP_ENABLE_EXT); break; default: break; } if (old_sc_irq != sc->sc_irq ) log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", unit, (sc->sc_irq & LP_ENABLE_IRQ)? "interrupt-driven":"polled", (sc->sc_irq & LP_ENABLE_EXT)? "extended":"standard"); } else /* polled port */ error = EOPNOTSUPP; break; default: error = ENODEV; } return(error); } /* * Because lpt is a static device that always exists under a ppbus device, * and not scanned by the ppbus device, we need an identify function to * install its device. */ static device_method_t lpt_methods[] = { /* device interface */ DEVMETHOD(device_identify, bus_generic_identify), DEVMETHOD(device_probe, lpt_probe), DEVMETHOD(device_attach, lpt_attach), { 0, 0 } }; static driver_t lpt_driver = { LPT_NAME, lpt_methods, sizeof(struct lpt_data), }; DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);