lpt.c

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    1 /*      $NetBSD: lpt.c,v 1.68 2006/11/16 01:32:51 christos Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1993, 1994 Charles M. Hannum.
    5  * Copyright (c) 1990 William F. Jolitz, TeleMuse
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This software is a component of "386BSD" developed by
   19  *      William F. Jolitz, TeleMuse.
   20  * 4. Neither the name of the developer nor the name "386BSD"
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
   25  * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
   26  * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
   27  * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
   28  * NOT MAKE USE OF THIS WORK.
   29  *
   30  * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
   31  * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
   32  * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES
   33  * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
   34  * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
   35  * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
   36  * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
   37  * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
   38  *
   39  * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
   40  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   42  * ARE DISCLAIMED.  IN NO EVENT SHALL THE DEVELOPER BE LIABLE
   43  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   44  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   45  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   47  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   48  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   49  * SUCH DAMAGE.
   50  */
   51 
   52 /*
   53  * Device Driver for AT style parallel printer port
   54  */
   55 
   56 #include <sys/cdefs.h>
   57 __KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.68 2006/11/16 01:32:51 christos Exp $");
   58 
   59 #include <sys/param.h>
   60 #include <sys/systm.h>
   61 #include <sys/proc.h>
   62 #include <sys/user.h>
   63 #include <sys/malloc.h>
   64 #include <sys/kernel.h>
   65 #include <sys/ioctl.h>
   66 #include <sys/uio.h>
   67 #include <sys/device.h>
   68 #include <sys/conf.h>
   69 #include <sys/syslog.h>
   70 
   71 #include <machine/bus.h>
   72 #include <machine/intr.h>
   73 
   74 #include <dev/ic/lptreg.h>
   75 #include <dev/ic/lptvar.h>
   76 
   77 #define TIMEOUT         hz*16   /* wait up to 16 seconds for a ready */
   78 #define STEP            hz/4
   79 
   80 #define LPTPRI          (PZERO+8)
   81 #define LPT_BSIZE       1024
   82 
   83 #define LPTDEBUG
   84 
   85 #ifndef LPTDEBUG
   86 #define LPRINTF(a)
   87 #else
   88 #define LPRINTF(a)      if (lptdebug) printf a
   89 int lptdebug = 0;
   90 #endif
   91 
   92 extern struct cfdriver lpt_cd;
   93 
   94 dev_type_open(lptopen);
   95 dev_type_close(lptclose);
   96 dev_type_write(lptwrite);
   97 dev_type_ioctl(lptioctl);
   98 
   99 const struct cdevsw lpt_cdevsw = {
  100         lptopen, lptclose, noread, lptwrite, lptioctl,
  101         nostop, notty, nopoll, nommap, nokqfilter, D_OTHER,
  102 };
  103 
  104 #define LPTUNIT(s)      (minor(s) & 0x1f)
  105 #define LPTFLAGS(s)     (minor(s) & 0xe0)
  106 
  107 void
  108 lpt_attach_subr(sc)
  109         struct lpt_softc *sc;
  110 {
  111         bus_space_tag_t iot;
  112         bus_space_handle_t ioh;
  113 
  114         sc->sc_state = 0;
  115 
  116         iot = sc->sc_iot;
  117         ioh = sc->sc_ioh;
  118 
  119         bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
  120 
  121         callout_init(&sc->sc_wakeup_ch);
  122 
  123         sc->sc_dev_ok = 1;
  124 }
  125 
  126 /*
  127  * Reset the printer, then wait until it's selected and not busy.
  128  */
  129 int
  130 lptopen(dev_t dev, int flag, int mode, struct lwp *l)
  131 {
  132         u_char flags = LPTFLAGS(dev);
  133         struct lpt_softc *sc;
  134         bus_space_tag_t iot;
  135         bus_space_handle_t ioh;
  136         u_char control;
  137         int error;
  138         int spin;
  139 
  140         sc = device_lookup(&lpt_cd, LPTUNIT(dev));
  141         if (!sc || !sc->sc_dev_ok)
  142                 return ENXIO;
  143 
  144 #if 0   /* XXX what to do? */
  145         if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0)
  146                 return ENXIO;
  147 #endif
  148 
  149 #ifdef DIAGNOSTIC
  150         if (sc->sc_state)
  151                 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
  152                     sc->sc_state);
  153 #endif
  154 
  155         if (sc->sc_state)
  156                 return EBUSY;
  157 
  158         sc->sc_state = LPT_INIT;
  159         sc->sc_flags = flags;
  160         LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname,
  161             (unsigned)flags));
  162         iot = sc->sc_iot;
  163         ioh = sc->sc_ioh;
  164 
  165         if ((flags & LPT_NOPRIME) == 0) {
  166                 /* assert INIT for 100 usec to start up printer */
  167                 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT);
  168                 delay(100);
  169         }
  170 
  171         control = LPC_SELECT | LPC_NINIT;
  172         bus_space_write_1(iot, ioh, lpt_control, control);
  173 
  174         /* wait till ready (printer running diagnostics) */
  175         for (spin = 0; NOT_READY_ERR(); spin += STEP) {
  176                 if (spin >= TIMEOUT) {
  177                         sc->sc_state = 0;
  178                         return EBUSY;
  179                 }
  180 
  181                 /* wait 1/4 second, give up if we get a signal */
  182                 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP);
  183                 if (error != EWOULDBLOCK) {
  184                         sc->sc_state = 0;
  185                         return error;
  186                 }
  187         }
  188 
  189         if ((flags & LPT_NOINTR) == 0)
  190                 control |= LPC_IENABLE;
  191         if (flags & LPT_AUTOLF)
  192                 control |= LPC_AUTOLF;
  193         sc->sc_control = control;
  194         bus_space_write_1(iot, ioh, lpt_control, control);
  195 
  196         sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK);
  197         sc->sc_count = 0;
  198         sc->sc_state = LPT_OPEN;
  199 
  200         if ((sc->sc_flags & LPT_NOINTR) == 0)
  201                 lptwakeup(sc);
  202 
  203         LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname));
  204         return 0;
  205 }
  206 
  207 int
  208 lptnotready(status, sc)
  209         u_char status;
  210         struct lpt_softc *sc;
  211 {
  212         u_char new;
  213 
  214         status = (status ^ LPS_INVERT) & LPS_MASK;
  215         new = status & ~sc->sc_laststatus;
  216         sc->sc_laststatus = status;
  217 
  218         if (sc->sc_state & LPT_OPEN) {
  219                 if (new & LPS_SELECT)
  220                         log(LOG_NOTICE,
  221                             "%s: offline\n", sc->sc_dev.dv_xname);
  222                 else if (new & LPS_NOPAPER)
  223                         log(LOG_NOTICE,
  224                             "%s: out of paper\n", sc->sc_dev.dv_xname);
  225                 else if (new & LPS_NERR)
  226                         log(LOG_NOTICE,
  227                             "%s: output error\n", sc->sc_dev.dv_xname);
  228         }
  229 
  230         return status;
  231 }
  232 
  233 void
  234 lptwakeup(arg)
  235         void *arg;
  236 {
  237         struct lpt_softc *sc = arg;
  238         int s;
  239 
  240         s = spllpt();
  241         lptintr(sc);
  242         splx(s);
  243 
  244         callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc);
  245 }
  246 
  247 /*
  248  * Close the device, and free the local line buffer.
  249  */
  250 int
  251 lptclose(dev_t dev, int flag, int mode,
  252     struct lwp *l)
  253 {
  254         struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev));
  255         bus_space_tag_t iot = sc->sc_iot;
  256         bus_space_handle_t ioh = sc->sc_ioh;
  257 
  258         if (sc->sc_count)
  259                 (void) lptpushbytes(sc);
  260 
  261         if ((sc->sc_flags & LPT_NOINTR) == 0)
  262                 callout_stop(&sc->sc_wakeup_ch);
  263 
  264         bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
  265         sc->sc_state = 0;
  266         bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
  267         free(sc->sc_inbuf, M_DEVBUF);
  268 
  269         LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname));
  270         return 0;
  271 }
  272 
  273 int
  274 lptpushbytes(sc)
  275         struct lpt_softc *sc;
  276 {
  277         bus_space_tag_t iot = sc->sc_iot;
  278         bus_space_handle_t ioh = sc->sc_ioh;
  279         int error;
  280 
  281         if (sc->sc_flags & LPT_NOINTR) {
  282                 int spin, tic;
  283                 u_char control = sc->sc_control;
  284 
  285                 while (sc->sc_count > 0) {
  286                         spin = 0;
  287                         while (NOT_READY()) {
  288                                 if (++spin < sc->sc_spinmax)
  289                                         continue;
  290                                 tic = 0;
  291                                 /* adapt busy-wait algorithm */
  292                                 sc->sc_spinmax++;
  293                                 while (NOT_READY_ERR()) {
  294                                         /* exponential backoff */
  295                                         tic = tic + tic + 1;
  296                                         if (tic > TIMEOUT)
  297                                                 tic = TIMEOUT;
  298                                         error = tsleep((caddr_t)sc,
  299                                             LPTPRI | PCATCH, "lptpsh", tic);
  300                                         if (error != EWOULDBLOCK)
  301                                                 return error;
  302                                 }
  303                                 break;
  304                         }
  305 
  306                         bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
  307                         DELAY(1);
  308                         bus_space_write_1(iot, ioh, lpt_control,
  309                             control | LPC_STROBE);
  310                         DELAY(1);
  311                         sc->sc_count--;
  312                         bus_space_write_1(iot, ioh, lpt_control, control);
  313                         DELAY(1);
  314 
  315                         /* adapt busy-wait algorithm */
  316                         if (spin*2 + 16 < sc->sc_spinmax)
  317                                 sc->sc_spinmax--;
  318                 }
  319         } else {
  320                 int s;
  321 
  322                 while (sc->sc_count > 0) {
  323                         /* if the printer is ready for a char, give it one */
  324                         if ((sc->sc_state & LPT_OBUSY) == 0) {
  325                                 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname,
  326                                     (u_long)sc->sc_count));
  327                                 s = spllpt();
  328                                 (void) lptintr(sc);
  329                                 splx(s);
  330                         }
  331                         error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
  332                             "lptwrite2", 0);
  333                         if (error)
  334                                 return error;
  335                 }
  336         }
  337         return 0;
  338 }
  339 
  340 /*
  341  * Copy a line from user space to a local buffer, then call putc to get the
  342  * chars moved to the output queue.
  343  */
  344 int
  345 lptwrite(dev_t dev, struct uio *uio, int flags)
  346 {
  347         struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev));
  348         size_t n;
  349         int error = 0;
  350 
  351         while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
  352                 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
  353                 sc->sc_count = n;
  354                 error = lptpushbytes(sc);
  355                 if (error) {
  356                         /*
  357                          * Return accurate residual if interrupted or timed
  358                          * out.
  359                          */
  360                         uio->uio_resid += sc->sc_count;
  361                         sc->sc_count = 0;
  362                         return error;
  363                 }
  364         }
  365         return 0;
  366 }
  367 
  368 /*
  369  * Handle printer interrupts which occur when the printer is ready to accept
  370  * another char.
  371  */
  372 int
  373 lptintr(arg)
  374         void *arg;
  375 {
  376         struct lpt_softc *sc = arg;
  377         bus_space_tag_t iot = sc->sc_iot;
  378         bus_space_handle_t ioh = sc->sc_ioh;
  379 
  380 #if 0
  381         if ((sc->sc_state & LPT_OPEN) == 0)
  382                 return 0;
  383 #endif
  384 
  385         /* is printer online and ready for output */
  386         if (NOT_READY() && NOT_READY_ERR())
  387                 return 0;
  388 
  389         if (sc->sc_count) {
  390                 u_char control = sc->sc_control;
  391                 /* send char */
  392                 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
  393                 DELAY(1);
  394                 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE);
  395                 DELAY(1);
  396                 sc->sc_count--;
  397                 bus_space_write_1(iot, ioh, lpt_control, control);
  398                 DELAY(1);
  399                 sc->sc_state |= LPT_OBUSY;
  400         } else
  401                 sc->sc_state &= ~LPT_OBUSY;
  402 
  403         if (sc->sc_count == 0) {
  404                 /* none, wake up the top half to get more */
  405                 wakeup((caddr_t)sc);
  406         }
  407 
  408         return 1;
  409 }
  410 
  411 int
  412 lptioctl(dev_t dev, u_long cmd, caddr_t data,
  413     int flag, struct lwp *l)
  414 {
  415         return ENODEV;
  416 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/ic/lpt.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/lpt.c
