/* $NetBSD: lpt.c,v 1.80 2014/07/25 08:10:37 dholland Exp $ */ /* * Copyright (c) 1993, 1994 Charles M. Hannum. * 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. */ /* * Device Driver for AT style parallel printer port */ #include __KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.80 2014/07/25 08:10:37 dholland Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ #define STEP hz/4 #define LPTPRI (PZERO+8) #define LPT_BSIZE 1024 #define LPTDEBUG #ifndef LPTDEBUG #define LPRINTF(a) #else #define LPRINTF(a) if (lptdebug) printf a int lptdebug = 0; #endif extern struct cfdriver lpt_cd; dev_type_open(lptopen); dev_type_close(lptclose); dev_type_write(lptwrite); dev_type_ioctl(lptioctl); const struct cdevsw lpt_cdevsw = { .d_open = lptopen, .d_close = lptclose, .d_read = noread, .d_write = lptwrite, .d_ioctl = lptioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = D_OTHER }; #define LPTUNIT(s) (minor(s) & 0x1f) #define LPTFLAGS(s) (minor(s) & 0xe0) static void lptsoftintr(void *); void lpt_attach_subr(struct lpt_softc *sc) { bus_space_tag_t iot; bus_space_handle_t ioh; sc->sc_state = 0; iot = sc->sc_iot; ioh = sc->sc_ioh; bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); callout_init(&sc->sc_wakeup_ch, 0); sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); sc->sc_dev_ok = 1; } int lpt_detach_subr(device_t self, int flags) { struct lpt_softc *sc = device_private(self); sc->sc_dev_ok = 0; softint_disestablish(sc->sc_sih); callout_destroy(&sc->sc_wakeup_ch); return 0; } /* * Reset the printer, then wait until it's selected and not busy. */ int lptopen(dev_t dev, int flag, int mode, struct lwp *l) { u_char flags = LPTFLAGS(dev); struct lpt_softc *sc; bus_space_tag_t iot; bus_space_handle_t ioh; u_char control; int error; int spin; sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); if (!sc || !sc->sc_dev_ok) return ENXIO; #if 0 /* XXX what to do? */ if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) return ENXIO; #endif #ifdef DIAGNOSTIC if (sc->sc_state) aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", sc->sc_state); #endif if (sc->sc_state) return EBUSY; sc->sc_state = LPT_INIT; sc->sc_flags = flags; LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), (unsigned)flags)); iot = sc->sc_iot; ioh = sc->sc_ioh; if ((flags & LPT_NOPRIME) == 0) { /* assert INIT for 100 usec to start up printer */ bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); delay(100); } control = LPC_SELECT | LPC_NINIT; bus_space_write_1(iot, ioh, lpt_control, control); /* wait till ready (printer running diagnostics) */ for (spin = 0; NOT_READY_ERR(); spin += STEP) { if (spin >= TIMEOUT) { sc->sc_state = 0; return EBUSY; } /* wait 1/4 second, give up if we get a signal */ error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); if (error != EWOULDBLOCK) { sc->sc_state = 0; return error; } } if ((flags & LPT_NOINTR) == 0) control |= LPC_IENABLE; if (flags & LPT_AUTOLF) control |= LPC_AUTOLF; sc->sc_control = control; bus_space_write_1(iot, ioh, lpt_control, control); sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); sc->sc_count = 0; sc->sc_state = LPT_OPEN; if ((sc->sc_flags & LPT_NOINTR) == 0) lptwakeup(sc); LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); return 0; } int lptnotready(u_char status, struct lpt_softc *sc) { u_char new; status = (status ^ LPS_INVERT) & LPS_MASK; new = status & ~sc->sc_laststatus; sc->sc_laststatus = status; if (sc->sc_state & LPT_OPEN) { if (new & LPS_SELECT) log(LOG_NOTICE, "%s: offline\n", device_xname(sc->sc_dev)); else if (new & LPS_NOPAPER) log(LOG_NOTICE, "%s: out of paper\n", device_xname(sc->sc_dev)); else if (new & LPS_NERR) log(LOG_NOTICE, "%s: output error\n", device_xname(sc->sc_dev)); } return status; } void lptwakeup(void *arg) { struct lpt_softc *sc = arg; int s; s = splvm(); lptintr(sc); splx(s); callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); } /* * Close the device, and free the local line buffer. */ int lptclose(dev_t dev, int flag, int mode, struct lwp *l) { struct lpt_softc *sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; if (sc->sc_count) (void) lptpushbytes(sc); if ((sc->sc_flags & LPT_NOINTR) == 0) callout_stop(&sc->sc_wakeup_ch); bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); sc->sc_state = 0; bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); free(sc->sc_inbuf, M_DEVBUF); LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); return 0; } int lptpushbytes(struct lpt_softc *sc) { bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; int error; if (sc->sc_flags & LPT_NOINTR) { int spin, tic; u_char control = sc->sc_control; while (sc->sc_count > 0) { spin = 0; while (NOT_READY()) { if (++spin < sc->sc_spinmax) continue; tic = 0; /* adapt busy-wait algorithm */ sc->sc_spinmax++; while (NOT_READY_ERR()) { /* exponential backoff */ tic = tic + tic + 1; if (tic > TIMEOUT) tic = TIMEOUT; error = tsleep((void *)sc, LPTPRI | PCATCH, "lptpsh", tic); if (error != EWOULDBLOCK) return error; } break; } bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); DELAY(1); bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); DELAY(1); sc->sc_count--; bus_space_write_1(iot, ioh, lpt_control, control); DELAY(1); /* adapt busy-wait algorithm */ if (spin*2 + 16 < sc->sc_spinmax) sc->sc_spinmax--; } } else { int s; while (sc->sc_count > 0) { /* if the printer is ready for a char, give it one */ if ((sc->sc_state & LPT_OBUSY) == 0) { LPRINTF(("%s: write %lu\n", device_xname(sc->sc_dev), (u_long)sc->sc_count)); s = splvm(); (void) lptintr(sc); splx(s); } error = tsleep((void *)sc, LPTPRI | PCATCH, "lptwrite2", 0); if (error) return error; } } return 0; } /* * Copy a line from user space to a local buffer, then call putc to get the * chars moved to the output queue. */ int lptwrite(dev_t dev, struct uio *uio, int flags) { struct lpt_softc *sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); size_t n; int error = 0; while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); sc->sc_count = n; error = lptpushbytes(sc); if (error) { /* * Return accurate residual if interrupted or timed * out. */ uio->uio_resid += sc->sc_count; sc->sc_count = 0; return error; } } return 0; } /* * Handle printer interrupts which occur when the printer is ready to accept * another char. */ int lptintr(void *arg) { struct lpt_softc *sc = arg; bus_space_tag_t iot = sc->sc_iot; bus_space_handle_t ioh = sc->sc_ioh; #if 0 if ((sc->sc_state & LPT_OPEN) == 0) return 0; #endif /* is printer online and ready for output */ if (NOT_READY() && NOT_READY_ERR()) return 0; if (sc->sc_count) { u_char control = sc->sc_control; /* send char */ bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); DELAY(1); bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); DELAY(1); sc->sc_count--; bus_space_write_1(iot, ioh, lpt_control, control); DELAY(1); sc->sc_state |= LPT_OBUSY; } else sc->sc_state &= ~LPT_OBUSY; if (sc->sc_count == 0) { /* none, wake up the top half to get more */ softint_schedule(sc->sc_sih); } return 1; } static void lptsoftintr(void *cookie) { wakeup(cookie); } int lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { return ENODEV; }