/* * 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 * $FreeBSD$ */ /* * Device Driver for AT parallel printer port * Written by William Jolitz 12/18/90 */ /* * Parallel port TCP/IP interfaces added. I looked at the driver from * MACH but this is a complete rewrite, and btw. incompatible, and it * should perform better too. I have never run the MACH driver though. * * This driver sends two bytes (0x08, 0x00) in front of each packet, * to allow us to distinguish another format later. * * Now added a Linux/Crynwr compatibility mode which is enabled using * IF_LINK0 - Tim Wilkinson. * * TODO: * Make HDLC/PPP mode, use IF_LLC1 to enable. * * Connect the two computers using a Laplink parallel cable to use this * feature: * * +----------------------------------------+ * |A-name A-End B-End Descr. Port/Bit | * +----------------------------------------+ * |DATA0 2 15 Data 0/0x01 | * |-ERROR 15 2 1/0x08 | * +----------------------------------------+ * |DATA1 3 13 Data 0/0x02 | * |+SLCT 13 3 1/0x10 | * +----------------------------------------+ * |DATA2 4 12 Data 0/0x04 | * |+PE 12 4 1/0x20 | * +----------------------------------------+ * |DATA3 5 10 Strobe 0/0x08 | * |-ACK 10 5 1/0x40 | * +----------------------------------------+ * |DATA4 6 11 Data 0/0x10 | * |BUSY 11 6 1/~0x80 | * +----------------------------------------+ * |GND 18-25 18-25 GND - | * +----------------------------------------+ * * Expect transfer-rates up to 75 kbyte/sec. * * If GCC could correctly grok * register int port asm("edx") * the code would be cleaner * * Poul-Henning Kamp */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 LPPRI (PZERO+8) #define BUFSIZE 1024 #ifndef PC98 /* BIOS printer list - used by BIOS probe*/ #define BIOS_LPT_PORTS 0x408 #define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS) #define BIOS_MAX_LPT 4 #endif #ifndef DEBUG #define lprintf(args) #else #define lprintf(args) do { \ if (lptflag) \ printf args; \ } while (0) static int volatile lptflag = 1; #endif #define LPTUNIT(s) ((s)&0x03) #define LPTFLAGS(s) ((s)&0xfc) struct lpt_softc { struct resource *res_port; struct resource *res_irq; void *sc_ih; int sc_port; short sc_state; /* default case: negative prime, negative ack, handshake strobe, prime once */ u_char sc_control; char sc_flags; #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 */ struct buf *sc_inbuf; short sc_xfercnt ; char sc_primed; char *sc_cp ; u_char 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 */ u_char sc_backoff ; /* time to call lptout() again */ }; /* bits for state */ #define OPEN (1<<0) /* device is open */ #define ASLP (1<<1) /* awaiting draining of printer */ #define ERROR (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 INIT (1<<6) /* waiting to initialize for open */ #define INTERRUPTED (1<<7) /* write call was interrupted */ /* 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 */ #ifdef PC98 #define NOT_READY(x) ((inb(x) & LPS_NBSY) != LPS_NBSY) #else /* IBM-PC */ #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(x) ((inb(x)^LPS_INVERT)&LPS_MASK) #endif #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ #define MAX_SPIN 20 /* Max delay for device ready in usecs */ static timeout_t lptout; static int lpt_probe(device_t); static int lpt_attach(device_t); static void lpt_intr(void *); static devclass_t olpt_devclass; static device_method_t olpt_methods[] = { DEVMETHOD(device_probe, lpt_probe), DEVMETHOD(device_attach, lpt_attach), { 0, 0 } }; static driver_t olpt_driver = { "olpt", olpt_methods, sizeof (struct lpt_softc), }; DRIVER_MODULE(olpt, isa, olpt_driver, olpt_devclass, 0, 0); static d_open_t lptopen; static d_close_t lptclose; static d_write_t lptwrite; static d_ioctl_t lptioctl; #define CDEV_MAJOR 16 static struct cdevsw lpt_cdevsw = { /* open */ lptopen, /* close */ lptclose, /* read */ noread, /* write */ lptwrite, /* ioctl */ lptioctl, /* poll */ nopoll, /* mmap */ nommap, /* strategy */ nostrategy, /* name */ "lpt", /* maj */ CDEV_MAJOR, /* dump */ nodump, /* psize */ nopsize, /* flags */ 0, }; static bus_addr_t lpt_iat[] = {0, 2, 4, 6}; #ifndef PC98 /* * Internal routine to lptprobe to do port tests of one byte value */ static int lpt_port_test (int port, u_char data, u_char mask) { int temp, timeout; data = data & mask; outb(port, data); timeout = 10000; do { DELAY(10); temp = inb(port) & mask; } while (temp != data && --timeout); lprintf(("Port 0x%x\tout=%x\tin=%x\ttout=%d\n", port, data, temp, timeout)); return (temp == data); } #endif /* PC98 */ /* * 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. */ int lpt_probe(device_t dev) { #ifdef PC98 #define PC98_OLD_LPT 0x40 #define PC98_IEEE_1284_FUNCTION 0x149 int rid; struct resource *res; /* Check isapnp ids */ if (isa_get_vendorid(dev)) return ENXIO; rid = 0; res = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4, RF_ACTIVE); if (res == NULL) return ENXIO; isa_load_resourcev(res, lpt_iat, 4); if (isa_get_port(dev) == PC98_OLD_LPT) { unsigned int pc98_ieee_mode, tmp; tmp = inb(PC98_IEEE_1284_FUNCTION); pc98_ieee_mode = tmp; if ((tmp & 0x10) == 0x10) { outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10); tmp = inb(PC98_IEEE_1284_FUNCTION); if ((tmp & 0x10) != 0x10) { outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode); bus_release_resource(dev, SYS_RES_IOPORT, rid, res); return ENXIO; } } } bus_release_resource(dev, SYS_RES_IOPORT, rid, res); return 0; #else int port; static short next_bios_lpt = 0; int status; 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; /* * Make sure there is some way for lptopen to see that * the port is not configured * This 0 will remain if the port isn't attached */ (lpt_sc + dvp->id_unit)->sc_port = 0; status = IO_LPTSIZE; /* If port not specified, use bios list */ if(dvp->id_iobase < 0) { /* port? */ if((next_bios_lpt < BIOS_MAX_LPT) && (*(BIOS_PORTS+next_bios_lpt) != 0) ) { dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++); goto end_probe; } else return (0); } /* Port was explicitly specified */ /* This allows probing of ports unknown to the BIOS */ port = dvp->id_iobase + lpt_data; for (i = 0; i < 18; i++) { if (!lpt_port_test(port, testbyte[i], 0xff)) { status = 0; goto end_probe; } } end_probe: /* write 0's to control and data ports */ outb(dvp->id_iobase+lpt_data, 0); outb(dvp->id_iobase+lpt_control, 0); return (status); #endif } /* XXX Todo - try and detect if interrupt is working */ int lpt_attach(device_t dev) { int rid, unit; struct lpt_softc *sc; unit = device_get_unit(dev); sc = device_get_softc(dev); rid = 0; sc->res_port = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4, RF_ACTIVE); if (sc->res_port == NULL) return ENXIO; isa_load_resourcev(sc->res_port, lpt_iat, 4); sc->sc_port = rman_get_start(sc->res_port); sc->sc_primed = 0; /* not primed yet */ #ifdef PC98 outb(sc->sc_port+lpt_pstb_ctrl, LPC_DIS_PSTB); /* PSTB disable */ outb(sc->sc_port+lpt_control, LPC_MODE8255); /* 8255 mode set */ outb(sc->sc_port+lpt_control, LPC_NIRQ8); /* IRQ8 inactive */ outb(sc->sc_port+lpt_control, LPC_NPSTB); /* PSTB inactive */ outb(sc->sc_port+lpt_pstb_ctrl, LPC_EN_PSTB); /* PSTB enable */ #else outb(sc->sc_port+lpt_control, LPC_NINIT); #endif sc->sc_irq = 0; if (isa_get_irq(dev) != -1) { rid = 0; sc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1, RF_ACTIVE); if (sc->res_irq == NULL) { bus_release_resource(dev, SYS_RES_IOPORT, 0, sc->res_port); return ENXIO; } if (bus_setup_intr(dev, sc->res_irq, INTR_TYPE_TTY, lpt_intr, sc, &sc->sc_ih)) { bus_release_resource(dev, SYS_RES_IOPORT, 0, sc->res_port); bus_release_resource(dev, SYS_RES_IRQ, 0, sc->res_irq); return ENXIO; } sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; device_printf(dev, "Interrupt-driven port"); } /* XXX what to do about the flags in the minor number? */ make_dev(&lpt_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit); make_dev(&lpt_cdevsw, unit | LP_BYPASS, UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit); return 0; } /* * 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 (dev_t dev, int flags, int fmt, struct thread *td) { struct lpt_softc *sc; int s; #ifdef PC98 int port; #else int trys, port; #endif sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); if (sc->sc_port == 0) return (ENXIO); if (sc->sc_state) { lprintf(("lp: still open %x\n", sc->sc_state)); return(EBUSY); } else sc->sc_state |= INIT; 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); } s = spltty(); lprintf(("lp flags 0x%x\n", sc->sc_flags)); port = sc->sc_port; /* 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 */ #ifndef PC98 if ((sc->sc_flags & LP_NO_PRIME) == 0) { if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { outb(port+lpt_control, 0); sc->sc_primed++; DELAY(500); } } outb (port+lpt_control, LPC_SEL|LPC_NINIT); /* wait till ready (printer running diagnostics) */ trys = 0; do { /* ran out of waiting for the printer */ if (trys++ >= LPINITRDY*4) { splx(s); sc->sc_state = 0; lprintf(("status %x\n", inb(port+lpt_status))); return (EBUSY); } /* wait 1/4 second, give up if we get a signal */ if (tsleep ((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) != EWOULDBLOCK) { sc->sc_state = 0; splx(s); return (EBUSY); } /* is printer online and ready for output */ } while ((inb(port+lpt_status) & (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; outb(port+lpt_control, sc->sc_control); #endif sc->sc_state = OPEN; sc->sc_inbuf = geteblk(BUFSIZE); sc->sc_xfercnt = 0; splx(s); /* only use timeout if using interrupt */ lprintf(("irq %x\n", sc->sc_irq)); if (sc->sc_irq & LP_USE_IRQ) { sc->sc_state |= TOUT; timeout (lptout, (caddr_t)sc, (sc->sc_backoff = hz/LPTOUTINITIAL)); } lprintf(("opened.\n")); return(0); } static void lptout (void *arg) { struct lpt_softc *sc = arg; int pl; lprintf(("T %x ", inb(sc->sc_port+lpt_status))); if (sc->sc_state & OPEN) { sc->sc_backoff++; if (sc->sc_backoff > hz/LPTOUTMAX) sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; timeout (lptout, (caddr_t)sc, sc->sc_backoff); } else sc->sc_state &= ~TOUT; if (sc->sc_state & ERROR) sc->sc_state &= ~ERROR; /* * Avoid possible hangs do to missed interrupts */ if (sc->sc_xfercnt) { pl = spltty(); lpt_intr(sc); splx(pl); } else { sc->sc_state &= ~OBUSY; wakeup((caddr_t)sc); } } /* * lptclose -- close the device, free the local line buffer. * * Check for interrupted write call added. */ static int lptclose(dev_t dev, int flags, int fmt, struct thread *td) { struct lpt_softc *sc; #ifndef PC98 int port; #endif sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); if(sc->sc_flags & LP_BYPASS) goto end_close; #ifndef PC98 port = sc->sc_port; #endif sc->sc_state &= ~OPEN; #ifndef PC98 /* if the last write was interrupted, don't complete it */ if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) while ((inb(port+lpt_status) & (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)sc, LPPRI|PCATCH, "lpclose", hz) != EWOULDBLOCK) break; outb(sc->sc_port+lpt_control, LPC_NINIT); #endif brelse(sc->sc_inbuf); end_close: sc->sc_state = 0; sc->sc_xfercnt = 0; lprintf(("closed.\n")); return(0); } /* * 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 pushbytes(struct lpt_softc * sc) { int spin, err, tic; char ch; int port = sc->sc_port; 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(port+lpt_status) && spin= MAX_SPIN) { tic = 0; while (NOT_READY(port+lpt_status)) { /* * 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)sc, LPPRI, "lptpoll", tic); if (err != EWOULDBLOCK) { return (err); } } } /* output data */ outb(port+lpt_data, ch); #ifdef PC98 DELAY(1); outb(port+lpt_control, LPC_PSTB); DELAY(1); outb(port+lpt_control, LPC_NPSTB); #else /* strobe */ outb(port+lpt_control, sc->sc_control|LPC_STB); outb(port+lpt_control, sc->sc_control); #endif } return(0); } /* * 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(dev_t dev, struct uio * uio, int ioflag) { register unsigned n; int pl, err; struct lpt_softc *sc; sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); if(sc->sc_flags & LP_BYPASS) { /* we can't do writes in bypass mode */ return(EPERM); } sc->sc_state &= ~INTERRUPTED; while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { sc->sc_cp = sc->sc_inbuf->b_data ; uiomove(sc->sc_cp, n, uio); sc->sc_xfercnt = n ; 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)); pl = spltty(); lpt_intr(sc); (void) splx(pl); } lprintf(("W ")); if (sc->sc_state & OBUSY) if ((err = tsleep ((caddr_t)sc, LPPRI|PCATCH, "lpwrite", 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")); if((err = pushbytes(sc))) return(err); } } return(0); } /* * lptintr -- 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) { } static int lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) { int error = 0; struct lpt_softc *sc; u_int unit = LPTUNIT(minor(dev)); u_char old_sc_irq; /* old printer IRQ status */ sc = devclass_get_softc(olpt_devclass, unit); switch (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; if(*(int*)data == 0) sc->sc_irq &= (~LP_ENABLE_IRQ); else sc->sc_irq |= LP_ENABLE_IRQ; if (old_sc_irq != sc->sc_irq ) log(LOG_NOTICE, "lpt%c switched to %s mode\n", (char)unit+'0', (sc->sc_irq & LP_ENABLE_IRQ)? "interrupt-driven":"polled"); } else /* polled port */ error = EOPNOTSUPP; break; default: error = ENODEV; } return(error); }