The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/i386/isa/asc.c

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    1 /* asc.c - device driver for hand scanners
    2  *
    3  * Current version supports:
    4  *
    5  *      - AmiScan (Mustek) Color and BW hand scanners (GI1904 chipset)
    6  *
    7  * Copyright (c) 1995 Gunther Schadow.  All rights reserved.
    8  * Copyright (c) 1995,1996,1997 Luigi Rizzo.  All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by Gunther Schadow
   21  *      and Luigi Rizzo.
   22  * 4. The name of the author may not be used to endorse or promote products
   23  *    derived from this software without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   35  */
   36 /*
   37  * $FreeBSD: releng/5.1/sys/i386/isa/asc.c 111815 2003-03-03 12:15:54Z phk $
   38  */
   39 
   40 #include "asc.h"
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/conf.h>
   44 #include <sys/proc.h>
   45 #include <sys/malloc.h>
   46 #include <sys/kernel.h>
   47 #include <sys/poll.h>
   48 #include <sys/selinfo.h>
   49 #include <sys/uio.h>
   50 #include <sys/bus.h>
   51 
   52 #include <machine/asc_ioctl.h>
   53 
   54 #include <i386/isa/isa.h>
   55 #include <i386/isa/isa_device.h>
   56 #include <i386/isa/ascreg.h>
   57 
   58 #ifndef COMPAT_OLDISA
   59 #error "The asc device requires the old isa compatibility shims"
   60 #endif
   61 
   62 /***
   63  *** CONSTANTS & DEFINES
   64  ***
   65  ***/
   66 
   67 #define PROBE_FAIL    0
   68 #define PROBE_SUCCESS IO_ASCSIZE
   69 #define ATTACH_FAIL   0
   70 #define ATTACH_SUCCESS 1
   71 #define SUCCESS       0
   72 #define FAIL         -1
   73 #define INVALID       FAIL
   74 
   75 #define DMA1_READY  0x08
   76 #define ASCDEBUG
   77 #ifdef ASCDEBUG
   78 #       define lprintf if(scu->flags & FLAG_DEBUG) printf
   79 #else
   80 #       define lprintf (void)
   81 #endif
   82 
   83 #define TIMEOUT (hz*15)  /* timeout while reading a buffer - default value */
   84 #define ASCPRI  PRIBIO   /* priority while reading a buffer */
   85 
   86 /***
   87  *** LAYOUT OF THE MINOR NUMBER
   88  ***/
   89 
   90 #define UNIT_MASK 0xc0    /* unit asc0 .. asc3 */
   91 #define UNIT(x)   (x >> 6)
   92 #define DBUG_MASK 0x20
   93 #define FRMT_MASK 0x18    /* output format */
   94 #define FRMT_RAW  0x00    /* output bits as read from scanner */
   95 #define FRMT_GRAY 0x1     /* output gray mode for color scanner */
   96 #define FRMT_PBM  0x08    /* output pbm format */
   97 #define FRMT_PGM  0x18
   98 
   99 /***
  100  *** THE GEMOMETRY TABLE
  101  ***/
  102 
  103 #define GREY_LINE 826 /* 825, or 826 , or 550 ??? */
  104 static const struct asc_geom {
  105   int dpi;     /* dots per inch */
  106   int dpl;     /* dots per line */
  107   int bpl;     /* bytes per line */
  108   int g_res;   /* get resolution value (ASC_STAT) */
  109 } geomtab[] = {
  110   { 800, 3312, 414, ASC_RES_800},
  111   { 700, 2896, 362, ASC_RES_700},
  112   { 600, 2480, 310, ASC_RES_600},
  113   { 500, 1656, 258, ASC_RES_500},
  114   { 400, 1656, 207, ASC_RES_400},
  115   { 300, 1240, 155, ASC_RES_300},
  116   { 200, 832, 104, ASC_RES_200},
  117   { 100, 416, 52, ASC_RES_100},
  118   { 200, 3*GREY_LINE, 3*GREY_LINE, 0 /* returned by color scanner */},
  119   { 200, GREY_LINE, GREY_LINE, 0 /* color scanner, grey mode */},
  120   { INVALID, 416, 52, INVALID } /* terminator */
  121 };
  122 
  123 /***
  124  *** THE TABLE OF UNITS
  125  ***/
  126 
  127 struct _sbuf {
  128   size_t  size;
  129   size_t  rptr;
  130   size_t  wptr; /* only changed in ascintr */
  131   size_t  count;
  132   char   *base;
  133 };
  134 
  135 struct asc_unit {
  136   long thedev;  /* XXX */
  137   int base;             /* base address */
  138   int dma_num;          /* dma number */
  139   char    dma_byte;       /* mask of byte for setting DMA value */
  140   char    int_byte;       /* mask of byte for setting int value */
  141   char    cfg_byte;       /* mirror of byte written to config reg (ASC_CFG). */
  142   char    cmd_byte;       /* mirror of byte written to cmd port (ASC_CMD)*/
  143   char   portf_byte;
  144   int flags;
  145 #define ATTACHED        0x01
  146 #define OPEN            0x02
  147 #define READING         0x04
  148 #define DMA_ACTIVE      0x08
  149 #define SLEEPING        0x10
  150 #define SEL_COLL        0x20
  151 #define PBM_MODE        0x40
  152 #define FLAG_DEBUG      0x80
  153   int     geometry;       /* resolution as geomtab index */
  154   int     linesize;       /* length of one scan line (from geom.table) */
  155   int     blen;           /* length of buffer in lines */
  156   int     btime;          /* timeout of buffer in seconds/hz */
  157   struct  _sbuf sbuf;
  158   long    icnt;         /* interrupt count XXX for debugging */
  159   struct selinfo selp;
  160   int     height;         /* height, for pnm modes */
  161   size_t  bcount;         /* bytes to read, for pnm modes */
  162 };
  163 
  164 static struct asc_unit unittab[NASC];                                 
  165 
  166 /*** I could not find a reasonable buffer size limit other than by
  167  *** experiments. MAXPHYS is obviously too much, while DEV_BSIZE and
  168  *** PAGE_SIZE are really too small. There must be something wrong
  169  *** with isa_dmastart/isa_dmarangecheck HELP!!!
  170  ***
  171  *** Note, must be DEFAULT_BLEN * samples_per_line <= MAX_BUFSIZE
  172  ***/
  173 #define MAX_BUFSIZE 0xb000 /* XXX was 0x3000 */
  174 #define DEFAULT_BLEN 16
  175 
  176 /***
  177  *** THE PER-DRIVER RECORD FOR ISA.C
  178  ***/
  179 static int ascprobe (struct isa_device *isdp);
  180 static int ascattach(struct isa_device *isdp);
  181 
  182 struct isa_driver ascdriver = {
  183         INTR_TYPE_TTY,
  184         ascprobe,
  185         ascattach,
  186         "asc"
  187 };
  188 COMPAT_ISA_DRIVER(asc, ascdriver);
  189 
  190 static ointhand2_t      ascintr;
  191 
  192 static d_open_t         ascopen;
  193 static d_close_t        ascclose;
  194 static d_read_t         ascread;
  195 static d_ioctl_t        ascioctl;
  196 static d_poll_t         ascpoll;
  197 
  198 #define CDEV_MAJOR 71
  199 
  200 static struct cdevsw asc_cdevsw = {
  201         .d_open =       ascopen,
  202         .d_close =      ascclose,
  203         .d_read =       ascread,
  204         .d_ioctl =      ascioctl,
  205         .d_poll =       ascpoll,
  206         .d_name =       "asc",
  207         .d_maj =        CDEV_MAJOR,
  208 };
  209 
  210 #define STATIC static
  211 
  212 /***
  213  *** LOCALLY USED SUBROUTINES
  214  ***
  215  ***/
  216 
  217 /***
  218  *** get_resolution
  219  ***    read resolution from the scanner
  220  ***/
  221 static void
  222 get_resolution(struct asc_unit *scu)
  223 {
  224     int res, i, delay;
  225 
  226     res=0;
  227     scu->cmd_byte = ASC_STANDBY;
  228     outb(ASC_CMD, scu->cmd_byte);
  229     tsleep(scu, ASCPRI | PCATCH, "ascres", hz/10);
  230     for(delay= 100; (res=inb(ASC_STAT)) & ASC_RDY_FLAG; delay--)
  231     {
  232         i = tsleep(scu, ASCPRI | PCATCH, "ascres0", 1);
  233         if ( ( i == 0 ) || ( i == EWOULDBLOCK ) )
  234             i = SUCCESS;
  235         else
  236             break;
  237     }
  238     if (delay==0) {
  239         lprintf("asc.get_resolution: timeout completing command\n");
  240         return /*  -1 */;
  241     }
  242     /* ... actual read resolution... */
  243     res &= ASC_RES_MASK;
  244     for (i=0; geomtab[i].dpi != INVALID; i++) {
  245         if (geomtab[i].g_res == res) break;
  246     }
  247     if (geomtab[i].dpi==INVALID) {
  248         scu->geometry= i; /* INVALID; */
  249         lprintf("asc.get_resolution: wrong resolution\n");
  250     } else {
  251         lprintf("asc.get_resolution: %d dpi\n",geomtab[i].dpi);
  252         scu->geometry = i;
  253     }
  254     scu->portf_byte=0; /* default */
  255     if (geomtab[scu->geometry].g_res==0 && !(scu->thedev&FRMT_GRAY)) {
  256         /* color scanner seems to require this */
  257         scu->portf_byte=2;
  258         /* scu->geometry++; */
  259     }
  260     scu->linesize = geomtab[scu->geometry].bpl;
  261     scu->height = geomtab[scu->geometry].dpl; /* default... */
  262 }
  263 
  264 /***
  265  *** buffer_allocate
  266  ***    allocate/reallocate a buffer
  267  ***    Now just checks that the preallocated buffer is large enough.
  268  ***/
  269 
  270 static int
  271 buffer_allocate(struct asc_unit *scu)
  272 {
  273   size_t size, size1;
  274 
  275   size = scu->blen * scu->linesize;
  276 
  277   lprintf("asc.buffer_allocate: need 0x%x bytes\n", size);
  278 
  279   if ( size > MAX_BUFSIZE ) {
  280       size1=size;
  281       size= ( (MAX_BUFSIZE+scu->linesize-1) / scu->linesize)*scu->linesize;
  282       lprintf("asc.buffer_allocate: 0x%x bytes are too much, try 0x%x\n",
  283           size1, size);
  284       return ENOMEM;
  285   }
  286 
  287   scu->sbuf.size = size;
  288   scu->sbuf.rptr  = 0;
  289   scu->sbuf.wptr  = 0;
  290   scu->sbuf.count  = 0; /* available data for reading */
  291 
  292   lprintf("asc.buffer_allocate: ok\n");
  293 
  294   return SUCCESS;
  295 }
  296 
  297 /*** dma_restart
  298  ***    invoked locally to start dma. Must run in a critical section
  299  ***/
  300 static void
  301 dma_restart(struct asc_unit *scu)
  302 {
  303     unsigned char al=scu->cmd_byte;
  304 
  305     if (geomtab[scu->geometry].g_res==0) {/* color */
  306         isa_dmastart(ISADMA_READ, scu->sbuf.base+scu->sbuf.wptr,
  307             scu->linesize + 90 /* XXX */ , scu->dma_num);
  308         /*
  309          * looks like we have to set and then clear this
  310          * bit to enable the scanner to send interrupts
  311          */
  312         outb( ASC_CMD, al |= 4 ); /* seems to disable interrupts */
  313 #if 0
  314         outb( ASC_CMD, al |= 8 ); /* ??? seems useless */
  315 #endif
  316         outb( ASC_CMD, al &= 0xfb );
  317         scu->cmd_byte = al;
  318     } else {                                    /* normal */
  319     isa_dmastart(ISADMA_READ, scu->sbuf.base+scu->sbuf.wptr,
  320         scu->linesize, scu->dma_num);
  321     /*** this is done in sub_20, after dmastart ? ***/  
  322 #if 0
  323     outb( ASC_CMD, al |= 4 );
  324     outb( ASC_CMD, al |= 8 ); /* ??? seems useless */
  325     outb( ASC_CMD, al &= 0xfb );
  326     scu->cmd_byte = al;
  327 #else
  328     outb( ASC_CMD, ASC_OPERATE); 
  329 #endif
  330     }
  331     scu->flags |= DMA_ACTIVE;
  332 }
  333 
  334 /***
  335  *** the main functions
  336  ***/
  337 
  338 /*** asc_reset
  339  ***    resets the scanner and the config bytes...
  340  ***/
  341 static void
  342 asc_reset(struct asc_unit *scu)
  343 {
  344   scu->cfg_byte = 0 ; /* clear... */
  345   scu->cmd_byte = 0 ; /* clear... */
  346 
  347   outb(ASC_CFG,scu->cfg_byte);  /* for safety, do this here */
  348   outb(ASC_CMD,scu->cmd_byte);  /* probably not needed */
  349   tsleep(scu, ASCPRI | PCATCH, "ascres", hz/10); /* sleep .1 sec */
  350 
  351   scu->blen = DEFAULT_BLEN;
  352   scu->btime = TIMEOUT;
  353   scu->height = 0 ; /* don't know better... */
  354 }
  355 /**************************************************************************
  356  ***
  357  *** ascprobe
  358  ***    read status port and check for proper configuration:
  359  ***    - if address group matches (status byte has reasonable value)
  360  ***      cannot check interrupt/dma, only clear the config byte.
  361  ***/
  362 static int
  363 ascprobe (struct isa_device *isdp)
  364 {
  365   int unit = isdp->id_unit;
  366   struct asc_unit *scu = unittab + unit;
  367   int stb;
  368 
  369   scu->base = isdp->id_iobase; /*** needed by the following macros ***/
  370   scu->flags = FLAG_DEBUG;
  371 
  372   if ( isdp->id_iobase < 0 ) {
  373       lprintf("asc%d.probe: no iobase given\n", unit);
  374       return PROBE_FAIL;
  375   }
  376 
  377   if ((stb=inb(ASC_PROBE)) != ASC_PROBE_VALUE) {
  378       lprintf("asc%d.probe: failed, got 0x%02x instead of 0x%02x\n",
  379           unit, stb, ASC_PROBE_VALUE);
  380       return PROBE_FAIL;
  381   }
  382 
  383 /*
  384  * NOTE NOTE NOTE
  385  * the new AmiScan Color board uses int 10,11,12 instead of 3,5,10
  386  * respectively. This means that the driver must act accordingly.
  387  * Unfortunately there is no easy way of telling which board one has,
  388  * other than trying to get an interrupt and noticing that it is
  389  * missing. use "option ASC_NEW_BOARD" if you have a new board.
  390  *
  391  */
  392 
  393 #if ASC_NEW_BOARD
  394 #define ASC_IRQ_A       10
  395 #define ASC_IRQ_B       11
  396 #define ASC_IRQ_C       12
  397 #else
  398 #define ASC_IRQ_A       3
  399 #define ASC_IRQ_B       5
  400 #define ASC_IRQ_C       10
  401 #endif
  402 
  403   switch(ffs(isdp->id_irq) - 1) {
  404     case ASC_IRQ_A :
  405       scu->int_byte = ASC_CNF_IRQ3;
  406       break;
  407     case ASC_IRQ_B :
  408       scu->int_byte = ASC_CNF_IRQ5;
  409       break;
  410     case ASC_IRQ_C :
  411       scu->int_byte = ASC_CNF_IRQ10;
  412       break;
  413 #if 0
  414     case -1:
  415       scu->int_byte = 0;
  416       lprintf("asc%d.probe: warning - going interruptless\n", unit);
  417       break;
  418 #endif
  419     default:
  420       lprintf("asc%d.probe: unsupported INT %d (only 3, 5, 10)\n",
  421                 unit, ffs(isdp->id_irq) - 1 );
  422       return PROBE_FAIL;
  423   }
  424   scu->dma_num = isdp->id_drq;
  425   switch(scu->dma_num) {
  426     case 1:
  427       scu->dma_byte = ASC_CNF_DMA1;
  428       break;
  429     case 3:
  430       scu->dma_byte = ASC_CNF_DMA3;
  431       break;
  432     default:
  433       lprintf("asc%d.probe: unsupported DMA %d (only 1 or 3)\n", 
  434                 unit, scu->dma_num);
  435       return PROBE_FAIL;
  436   }
  437   asc_reset(scu);
  438 /*  lprintf("asc%d.probe: ok\n", unit); */
  439 
  440   scu->flags &= ~FLAG_DEBUG;
  441   scu->icnt = 0;
  442   return PROBE_SUCCESS;
  443 }
  444 
  445 /**************************************************************************
  446  ***
  447  *** ascattach
  448  ***    finish initialization of unit structure, get geometry value (?)
  449  ***/
  450 
  451 static int
  452 ascattach(struct isa_device *isdp)
  453 {
  454   int unit = isdp->id_unit;
  455   struct asc_unit *scu = unittab + unit;
  456 
  457   isdp->id_ointr = ascintr;
  458   scu->flags |= FLAG_DEBUG;
  459   printf("asc%d: [GI1904/Trust Ami-Scan Grey/Color]\n", unit);
  460 
  461   /*
  462    * Initialize buffer structure.
  463    * XXX this must be done early to give a good chance of getting a
  464    * contiguous buffer.  This wastes memory.
  465    */
  466   scu->sbuf.base = contigmalloc((unsigned long)MAX_BUFSIZE, M_DEVBUF, M_NOWAIT,
  467                                 0ul, 0xfffffful, 1ul, 0x10000ul);
  468   if ( scu->sbuf.base == NULL )
  469     {
  470       lprintf("asc%d.attach: buffer allocation failed\n", unit);
  471       return ATTACH_FAIL;       /* XXX attach must not fail */
  472     }
  473   scu->sbuf.size = INVALID;
  474   scu->sbuf.rptr  = INVALID;
  475 
  476   scu->flags |= ATTACHED;
  477 /*  lprintf("asc%d.attach: ok\n", unit); */
  478   scu->flags &= ~FLAG_DEBUG;
  479 
  480     scu->selp.si_flags=0;
  481 #define ASC_UID 0
  482 #define ASC_GID 13
  483   make_dev(&asc_cdevsw, unit<<6, ASC_UID, ASC_GID, 0666, "asc%d", unit);
  484   make_dev(&asc_cdevsw, ((unit<<6) + FRMT_PBM),
  485     ASC_UID,  ASC_GID, 0666, "asc%dp", unit);
  486   make_dev(&asc_cdevsw, ((unit<<6) + DBUG_MASK),
  487     ASC_UID,  ASC_GID, 0666, "asc%dd", unit);
  488   make_dev(&asc_cdevsw, ((unit<<6) + DBUG_MASK+FRMT_PBM), 
  489     ASC_UID, ASC_GID, 0666, "asc%dpd", unit);
  490   return ATTACH_SUCCESS;
  491 }
  492 
  493 /**************************************************************************
  494  ***
  495  *** ascintr
  496  ***    the interrupt routine, at the end of DMA...
  497  ***/
  498 static void
  499 ascintr(int unit)
  500 {
  501     struct asc_unit *scu = unittab + unit;
  502     int chan_bit = 0x01 << scu->dma_num;
  503 
  504     scu->icnt++;
  505     /* ignore stray interrupts... */
  506     if ((scu->flags & (OPEN |READING)) != (OPEN | READING) ) {
  507         /* must be after closing... */
  508         scu->flags &= ~(OPEN | READING | DMA_ACTIVE | SLEEPING | SEL_COLL);
  509         return;
  510     }
  511     if ( (scu->flags & DMA_ACTIVE) && (inb(DMA1_READY) & chan_bit) != 0) {
  512         outb( ASC_CMD, ASC_STANDBY);
  513         scu->flags &= ~DMA_ACTIVE;
  514                 /* bounce buffers... */
  515         isa_dmadone(ISADMA_READ, scu->sbuf.base+scu->sbuf.wptr,
  516             scu->linesize, scu->dma_num);
  517         scu->sbuf.wptr += scu->linesize;
  518         if (scu->sbuf.wptr >= scu->sbuf.size) scu->sbuf.wptr=0;
  519         scu->sbuf.count += scu->linesize;
  520         if (scu->flags & SLEEPING) {
  521             scu->flags &= ~SLEEPING;
  522             wakeup(scu);
  523         }
  524         if (scu->sbuf.size - scu->sbuf.count >= scu->linesize) {
  525             dma_restart(scu);
  526         }
  527         if (SEL_WAITING(&scu->selp)) {
  528             selwakeup(&scu->selp);
  529         }
  530     }
  531 }
  532 
  533 /**************************************************************************
  534  ***
  535  *** ascopen
  536  ***    set open flag, set modes according to minor number
  537  ***    FOR RELEASE:
  538  ***    don't switch scanner on, wait until first read or ioctls go before
  539  ***/
  540 
  541 STATIC int
  542 ascopen(dev_t dev, int flags, int fmt, struct thread *td)
  543 {
  544   struct asc_unit *scu;
  545   int unit;
  546 
  547   unit = UNIT(minor(dev)) & UNIT_MASK;
  548   if ( unit >= NASC )
  549     {
  550 #ifdef ASCDEBUG
  551       /* XXX lprintf isn't valid here since there is no scu. */
  552       printf("asc%d.open: unconfigured unit number (max %d)\n", unit, NASC);
  553 #endif
  554       return ENXIO;
  555     }
  556   scu = unittab + unit;
  557   if ( !( scu->flags & ATTACHED ) )
  558     {
  559       lprintf("asc%d.open: unit was not attached successfully 0x%04x\n",
  560              unit, scu->flags);
  561       return ENXIO;
  562     }
  563 
  564   if ( minor(dev) & DBUG_MASK )
  565     scu->flags |= FLAG_DEBUG;
  566   else
  567     scu->flags &= ~FLAG_DEBUG;
  568 
  569   switch(minor(dev) & FRMT_MASK) {
  570   case FRMT_PBM:
  571     scu->flags |= PBM_MODE;
  572     lprintf("asc%d.open: pbm mode\n", unit);
  573     break;
  574   case FRMT_RAW:
  575     lprintf("asc%d.open: raw mode\n", unit);
  576     scu->flags &= ~PBM_MODE;
  577     break;
  578   default:
  579     lprintf("asc%d.open: gray maps are not yet supported", unit);
  580     return ENXIO;
  581   }
  582   
  583   lprintf("asc%d.open: minor %d icnt %ld\n", unit, minor(dev), scu->icnt);
  584 
  585   if ( scu->flags & OPEN ) {
  586       lprintf("asc%d.open: already open", unit);
  587       return EBUSY;
  588   }
  589   if (isa_dma_acquire(scu->dma_num))
  590       return(EBUSY);
  591 
  592   scu->flags = ATTACHED | OPEN;      
  593 
  594   asc_reset(scu);
  595   get_resolution(scu);
  596   return SUCCESS;
  597 }
  598 
  599 static int
  600 asc_startread(struct asc_unit *scu)
  601 {
  602     /*** from here on, things can be delayed to the first read/ioctl ***/
  603     /*** this was done in sub_12... ***/
  604   scu->cfg_byte= scu->cmd_byte=0;       /* init scanner */
  605   outb(ASC_CMD, scu->cmd_byte);
  606     /*** this was done in sub_16, set scan len... ***/
  607   outb(ASC_BOH, scu->portf_byte );
  608   if (geomtab[scu->geometry].g_res==0) {                /* color */
  609         scu->cmd_byte = 0x00 ;
  610   } else {
  611   scu->cmd_byte = 0x90 ;
  612   }
  613   outb(ASC_CMD, scu->cmd_byte);
  614   outb(ASC_LEN_L, scu->linesize & 0xff /* len_low */);
  615   outb(ASC_LEN_H, (scu->linesize >>8) & 0xff /* len_high */);
  616     /*** this was done in sub_21, config DMA ... ***/
  617   scu->cfg_byte |= scu->dma_byte;
  618   outb(ASC_CFG, scu->cfg_byte);
  619     /*** sub_22: enable int on the scanner ***/
  620   scu->cfg_byte |= scu->int_byte;
  621   outb(ASC_CFG, scu->cfg_byte);
  622     /*** sub_28: light on etc...***/
  623   scu->cmd_byte = ASC_STANDBY;
  624   outb(ASC_CMD, scu->cmd_byte);
  625   tsleep(scu, ASCPRI | PCATCH, "ascstrd", hz/10); /* sleep .1 sec */
  626   return SUCCESS;
  627 }
  628 
  629 /**************************************************************************
  630  ***
  631  *** ascclose
  632  ***    turn off scanner, release the buffer
  633  ***    should probably terminate dma ops, release int and dma. lr 12mar95
  634  ***/
  635 
  636 STATIC int
  637 ascclose(dev_t dev, int flags, int fmt, struct thread *td)
  638 {
  639   int unit = UNIT(minor(dev));
  640   struct asc_unit *scu = unittab + unit;
  641 
  642   lprintf("asc%d.close: minor %d\n",
  643          unit, minor(dev));
  644 
  645   if ( unit >= NASC || !( scu->flags & ATTACHED ) ) {
  646       lprintf("asc%d.close: unit was not attached successfully 0x%04x\n",
  647              unit, scu->flags);
  648       return ENXIO;
  649   }
  650     /* all this is in sub_29... */
  651   /* cli(); */
  652   outb(ASC_CFG, 0 ); /* don't save in CFG byte!!! */
  653   scu->cmd_byte &= ~ASC_LIGHT_ON;
  654   outb(ASC_CMD, scu->cmd_byte);/* light off */
  655   tsleep(scu, ASCPRI | PCATCH, "ascclo", hz/2); /* sleep 1/2 sec */
  656   scu->cfg_byte &= ~ scu->dma_byte ; /* disable scanner dma */
  657   scu->cfg_byte &= ~ scu->int_byte ; /* disable scanner int */
  658   outb(ASC_CFG, scu->cfg_byte);
  659     /* --- disable dma controller ? --- */
  660   isa_dma_release(scu->dma_num);
  661     /* --- disable interrupts on the controller (sub_24) --- */
  662 
  663   scu->sbuf.size = INVALID;
  664   scu->sbuf.rptr  = INVALID;
  665 
  666   scu->flags &= ~(FLAG_DEBUG | OPEN | READING);
  667   
  668   return SUCCESS;
  669 }
  670 
  671 static void
  672 pbm_init(struct asc_unit *scu)
  673 {
  674     int width = geomtab[scu->geometry].dpl;
  675     int l= sprintf(scu->sbuf.base,"P4 %d %d\n", width, scu->height);
  676     char *p;
  677 
  678     scu->bcount = scu->height * width / 8 + l;
  679 
  680       /* move header to end of sbuf */
  681     scu->sbuf.rptr=scu->sbuf.size-l;
  682     bcopy(scu->sbuf.base, scu->sbuf.base+scu->sbuf.rptr,l);
  683     scu->sbuf.count = l;
  684     if (geomtab[scu->geometry].g_res!=0) { /* BW scanner */
  685     for(p = scu->sbuf.base + scu->sbuf.rptr; l; p++, l--)
  686         *p = ~*p;
  687 }
  688 }
  689 /**************************************************************************
  690  ***
  691  *** ascread
  692  ***/
  693 
  694 STATIC int
  695 ascread(dev_t dev, struct uio *uio, int ioflag)
  696 {
  697   int unit = UNIT(minor(dev));
  698   struct asc_unit *scu = unittab + unit;
  699   size_t nbytes;
  700   int sps, res;
  701   unsigned char *p;
  702   
  703   lprintf("asc%d.read: minor %d icnt %ld\n", unit, minor(dev), scu->icnt);
  704 
  705   if ( unit >= NASC || !( scu->flags & ATTACHED ) ) {
  706       lprintf("asc%d.read: unit was not attached successfully 0x%04x\n",
  707              unit, scu->flags);
  708       return ENXIO;
  709   }
  710 
  711   if ( !(scu->flags & READING) ) { /*** first read... ***/
  712         /* allocate a buffer for reading data and init things */
  713       if ( (res = buffer_allocate(scu)) == SUCCESS ) scu->flags |= READING;
  714       else return res;
  715       asc_startread(scu);
  716       if ( scu->flags & PBM_MODE ) { /* initialize for pbm mode */
  717           pbm_init(scu);
  718       }
  719   }
  720   
  721   lprintf("asc%d.read(before): "
  722       "sz 0x%x, rptr 0x%x, wptr 0x%x, cnt 0x%x bcnt 0x%x flags 0x%x icnt %ld\n",
  723           unit, scu->sbuf.size, scu->sbuf.rptr,
  724           scu->sbuf.wptr, scu->sbuf.count, scu->bcount,scu->flags,
  725           scu->icnt);
  726 
  727   sps=spltty();
  728   if ( scu->sbuf.count == 0 ) { /* no data avail., must wait */
  729       if (!(scu->flags & DMA_ACTIVE)) dma_restart(scu);
  730       scu->flags |= SLEEPING;
  731       res = tsleep(scu, ASCPRI | PCATCH, "ascread", 0);
  732       scu->flags &= ~SLEEPING;
  733       if ( res == 0 ) res = SUCCESS;
  734   }
  735   splx(sps); /* lower priority... */
  736   if (scu->flags & FLAG_DEBUG)
  737       tsleep(scu, ASCPRI | PCATCH, "ascdly",hz);
  738   lprintf("asc%d.read(after): "
  739       "sz 0x%x, rptr 0x%x, wptr 0x%x, cnt 0x%x bcnt 0x%x flags 0x%x icnt %ld\n",
  740           unit, scu->sbuf.size, scu->sbuf.rptr,
  741           scu->sbuf.wptr, scu->sbuf.count, scu->bcount,scu->flags,scu->icnt);
  742 
  743         /* first, not more than available... */
  744   nbytes = min( uio->uio_resid, scu->sbuf.count );
  745         /* second, contiguous data... */
  746   nbytes = min( nbytes, (scu->sbuf.size - scu->sbuf.rptr) );
  747         /* third, one line (will remove this later, XXX) */
  748   nbytes = min( nbytes, scu->linesize );
  749   if ( (scu->flags & PBM_MODE) )
  750       nbytes = min( nbytes, scu->bcount );
  751   lprintf("asc%d.read: transferring 0x%x bytes\n", unit, nbytes);
  752   if (geomtab[scu->geometry].g_res!=0) { /* BW scanner */
  753   lprintf("asc%d.read: invert buffer\n",unit);
  754   for(p = scu->sbuf.base + scu->sbuf.rptr, res=nbytes; res; p++, res--)
  755         *p = ~*p;
  756   }
  757   res = uiomove(scu->sbuf.base + scu->sbuf.rptr, nbytes, uio);
  758   if ( res != SUCCESS ) {
  759       lprintf("asc%d.read: uiomove failed %d", unit, res);
  760       return res;
  761   }
  762   
  763   sps=spltty();
  764   scu->sbuf.rptr += nbytes;
  765   if (scu->sbuf.rptr >= scu->sbuf.size) scu->sbuf.rptr=0;
  766   scu->sbuf.count -= nbytes;
  767         /* having moved some data, can read mode */
  768   if (!(scu->flags & DMA_ACTIVE)) dma_restart(scu);
  769   splx(sps); /* lower priority... */
  770   if ( scu->flags & PBM_MODE ) scu->bcount -= nbytes;
  771   
  772   lprintf("asc%d.read: size 0x%x, pointer 0x%x, bcount 0x%x, ok\n",
  773           unit, scu->sbuf.size, scu->sbuf.rptr, scu->bcount);
  774   
  775   return SUCCESS;
  776 }
  777 
  778 /**************************************************************************
  779  ***
  780  *** ascioctl
  781  ***/
  782 
  783 STATIC int
  784 ascioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td)
  785 {
  786   int unit = UNIT(minor(dev));
  787   struct asc_unit *scu = unittab + unit;
  788 
  789   lprintf("asc%d.ioctl: minor %d\n",
  790          unit, minor(dev));
  791 
  792   if ( unit >= NASC || !( scu->flags & ATTACHED ) ) {
  793       lprintf("asc%d.ioctl: unit was not attached successfully 0x%04x\n",
  794              unit, scu->flags);
  795       return ENXIO;
  796   }
  797   switch(cmd) {
  798   case ASC_GRES:
  799     asc_reset(scu);
  800     get_resolution(scu);
  801     *(int *)data=geomtab[scu->geometry].dpi;
  802     lprintf("asc%d.ioctl:ASC_GRES %ddpi\n", unit, *(int *)data);
  803     return SUCCESS;    
  804   case ASC_GWIDTH:
  805     *(int *)data=geomtab[scu->geometry].dpl;
  806     lprintf("asc%d.ioctl:ASC_GWIDTH %d\n", unit, *(int *)data);
  807     return SUCCESS;    
  808   case ASC_GHEIGHT:
  809     *(int *)data=scu->height;
  810     lprintf("asc%d.ioctl:ASC_GHEIGHT %d\n", unit, *(int *)data);
  811     return SUCCESS;
  812   case ASC_SHEIGHT:
  813     lprintf("asc%d.ioctl:ASC_SHEIGHT %d\n", unit, *(int *)data);
  814     if ( scu->flags & READING ) { 
  815         lprintf("asc%d:ioctl on already reading unit\n", unit);
  816         return EBUSY;
  817     }
  818     scu->height=*(int *)data;
  819     return SUCCESS;
  820 #if 0  
  821   case ASC_GBLEN:
  822     *(int *)data=scu->blen;
  823     lprintf("asc%d.ioctl:ASC_GBLEN %d\n", unit, *(int *)data);
  824     return SUCCESS;
  825   case ASC_SBLEN:
  826     lprintf("asc%d.ioctl:ASC_SBLEN %d\n", unit, *(int *)data);
  827     if (*(int *)data * geomtab[scu->geometry].dpl / 8 > MAX_BUFSIZE)
  828       {
  829         lprintf("asc%d:ioctl buffer size too high\n", unit);
  830         return ENOMEM;
  831       }
  832     scu->blen=*(int *)data;
  833     return SUCCESS;
  834   case ASC_GBTIME:
  835     *(int *)data = scu->btime / hz;
  836     lprintf("asc%d.ioctl:ASC_GBTIME %d\n", unit, *(int *)data);
  837     return SUCCESS;
  838   case ASC_SBTIME:
  839     scu->btime = *(int *)data * hz;
  840     lprintf("asc%d.ioctl:ASC_SBTIME %d\n", unit, *(int *)data);
  841     return SUCCESS;
  842 #endif
  843   default: return ENOTTY;
  844   }
  845   return SUCCESS;
  846 }
  847 
  848 STATIC int
  849 ascpoll(dev_t dev, int events, struct thread *td)
  850 {
  851     int unit = UNIT(minor(dev));
  852     struct asc_unit *scu = unittab + unit;
  853     int sps;
  854     int revents = 0;
  855 
  856     sps=spltty();
  857 
  858     if (events & (POLLIN | POLLRDNORM)) {
  859         if (scu->sbuf.count >0)
  860             revents |= events & (POLLIN | POLLRDNORM);
  861         else {
  862             if (!(scu->flags & DMA_ACTIVE))
  863                 dma_restart(scu);
  864             
  865             selrecord(td, &scu->selp);
  866         }
  867     }
  868     splx(sps);
  869     return (revents);
  870 }

Cache object: fafb36fa72d1597d8b98ade58c143c24


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