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freebsd/sys/i386/isa/gsc.c
Doug Rabson ecbb00a262 This commit fixes various 64bit portability problems required for 
FreeBSD/alpha.  The most significant item is to change the command
argument to ioctl functions from int to u_long.  This change brings us
inline with various other BSD versions.  Driver writers may like to
use (__FreeBSD_version == 300003) to detect this change.

The prototype FreeBSD/alpha machdep will follow in a couple of days
time.
1998-06-07 17:13:14 +00:00

850 lines
22 KiB
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/* gsc.c - device driver for handy scanners
*
* Current version supports:
*
* - Genius GS-4500
*
* Copyright (c) 1995 Gunther Schadow. 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 product includes software developed by Gunther Schadow.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include "gsc.h"
#if NGSC > 0
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <sys/uio.h>
#include <machine/gsc.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/gscreg.h>
/***********************************************************************
*
* CONSTANTS & DEFINES
*
***********************************************************************/
#define PROBE_FAIL 0
#define PROBE_SUCCESS IO_GSCSIZE
#define ATTACH_FAIL 0
#define ATTACH_SUCCESS 1
#define SUCCESS 0
#define FAIL -1
#define INVALID FAIL
#define DMA1_READY 0x08
#ifdef GSCDEBUG
#define lprintf if(scu->flags & FLAG_DEBUG) printf
#else
#define lprintf (void)
#endif
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define TIMEOUT (hz*15) /* timeout while reading a buffer - default value */
#define LONG (hz/60) /* timesteps while reading a buffer */
#define GSCPRI PRIBIO /* priority while reading a buffer */
/***********************************************************************
*
* LAYOUT OF THE MINOR NUMBER
*
***********************************************************************/
#define UNIT_MASK 0xc0 /* unit gsc0 .. gsc3 */
#define UNIT(x) (x >> 6)
#define DBUG_MASK 0x20
#define FRMT_MASK 0x18 /* output format */
#define FRMT_RAW 0x00 /* output bits as read from scanner */
#define FRMT_GRAY 0x10 /* output graymap (not implemented yet) */
#define FRMT_PBM 0x08 /* output pbm format */
#define FRMT_PGM 0x18
/***********************************************************************
*
* THE GEMOMETRY TABLE
*
***********************************************************************/
#define GEOMTAB_SIZE 7
static const struct gsc_geom {
int dpi; /* dots per inch */
int dpl; /* dots per line */
int g_res; /* get resolution value (status flag) */
int s_res; /* set resolution value (control register) */
} geomtab[GEOMTAB_SIZE] = {
{ 100, 424, GSC_RES_100, GSC_CNT_424},
{ 200, 840, GSC_RES_200, GSC_CNT_840},
{ 300, 1264, GSC_RES_300, GSC_CNT_1264},
{ 400, 1648, GSC_RES_400, GSC_CNT_1648},
{ -1, 1696, -1, GSC_CNT_1696},
{ -2, 2644, -2, GSC_CNT_2544},
{ -3, 3648, -3, GSC_CNT_3648},
};
#define NEW_GEOM { INVALID, INVALID, INVALID, INVALID }
/***********************************************************************
*
* THE TABLE OF UNITS
*
***********************************************************************/
struct _sbuf {
size_t size;
size_t poi;
char *base;
};
struct gsc_unit {
int channel; /* DMA channel */
int data; /* - video port */
int stat; /* - status port */
int ctrl; /* - control port */
int clrp; /* - clear port */
int flags;
#define ATTACHED 0x01
#define OPEN 0x02
#define READING 0x04
#define EOF 0x08
#define FLAG_DEBUG 0x10
#define PBM_MODE 0x20
int geometry; /* resolution as geomtab index */
int blen; /* length of buffer in lines */
int btime; /* timeout of buffer in seconds/hz */
struct _sbuf sbuf;
char ctrl_byte; /* the byte actually written to ctrl port */
int height; /* height, for pnm modes */
size_t bcount; /* bytes to read, for pnm modes */
struct _sbuf hbuf; /* buffer for pnm header data */
#ifdef DEVFS
void *devfs_gsc; /* storage for devfs tokens (handles) */
void *devfs_gscp;
void *devfs_gscd;
void *devfs_gscpd;
#endif
};
static struct gsc_unit unittab[NGSC];
/* I could not find a reasonable buffer size limit other than by
* experiments. MAXPHYS is obviously too much, while DEV_BSIZE and
* PAGE_SIZE are really too small. There must be something wrong
* with isa_dmastart/isa_dmarangecheck HELP!!!
*/
#define MAX_BUFSIZE 0x3000
#define DEFAULT_BLEN 59
/***********************************************************************
*
* THE PER-DRIVER RECORD FOR ISA.C
*
***********************************************************************/
static int gscprobe (struct isa_device *isdp);
static int gscattach(struct isa_device *isdp);
struct isa_driver gscdriver = { gscprobe, gscattach, "gsc" };
static d_open_t gscopen;
static d_close_t gscclose;
static d_read_t gscread;
static d_ioctl_t gscioctl;
#define CDEV_MAJOR 47
static struct cdevsw gsc_cdevsw =
{ gscopen, gscclose, gscread, nowrite, /*47*/
gscioctl, nostop, nullreset, nodevtotty,/* gsc */
seltrue, nommap, NULL, "gsc", NULL, -1 };
/***********************************************************************
*
* LOCALLY USED SUBROUTINES
*
***********************************************************************/
/***********************************************************************
*
* lookup_geometry -- lookup a record in the geometry table by pattern
*
* The caller supplies a geometry record pattern, where INVALID
* matches anything. Returns the index in the table or INVALID if
* lookup fails.
*/
static int
lookup_geometry(struct gsc_geom geom, const struct gsc_unit *scu)
{
struct gsc_geom tab;
int i;
for(i=0; i<GEOMTAB_SIZE; i++)
{
tab = geomtab[i];
if ( ( ( geom.dpi != INVALID ) && ( tab.dpi == geom.dpi ) ) ||
( ( geom.dpl != INVALID ) && ( tab.dpl == geom.dpl ) ) ||
( ( geom.g_res != INVALID ) && ( tab.g_res == geom.g_res ) ) ||
( ( geom.s_res != INVALID ) && ( tab.s_res == geom.s_res ) ) )
{
lprintf("gsc.lookup_geometry: "
"geometry lookup found: %ddpi, %ddpl\n",
tab.dpi, tab.dpl);
return i;
}
}
lprintf("gsc.lookup_geometry: "
"geometry lookup failed on {%d, %d, 0x%02x, 0x%02x}\n",
geom.dpi, geom.dpl, geom.g_res, geom.s_res);
return INVALID;
}
/***********************************************************************
*
* get_geometry -- read geometry from status port
*
* Returns the index into geometry table or INVALID if it fails to
* either read the status byte or lookup the record.
*/
static int
get_geometry(const struct gsc_unit *scu)
{
struct gsc_geom geom = NEW_GEOM;
lprintf("gsc.get_geometry: get geometry at 0x%03x\n", scu->stat);
if ( ( geom.g_res = inb(scu->stat) ) == FAIL )
return INVALID;
geom.g_res &= GSC_RES_MASK;
return lookup_geometry(geom, scu);
}
/***********************************************************************
*
* buffer_allocate -- allocate/reallocate a buffer
* Now just checks that the preallocated buffer is large enough.
*/
static int
buffer_allocate(struct gsc_unit *scu)
{
size_t size;
size = scu->blen * geomtab[scu->geometry].dpl / 8;
lprintf("gsc.buffer_allocate: need 0x%x bytes\n", size);
if ( size > MAX_BUFSIZE )
{
lprintf("gsc.buffer_allocate: 0x%x bytes are too much\n", size);
return ENOMEM;
}
scu->sbuf.size = size;
scu->sbuf.poi = size;
lprintf("gsc.buffer_allocate: ok\n");
return SUCCESS;
}
/***********************************************************************
*
* buffer_read -- scan a buffer
*/
static int
buffer_read(struct gsc_unit *scu)
{
int stb;
int res = SUCCESS;
int chan_bit;
char *p;
int sps;
int delay;
lprintf("gsc.buffer_read: begin\n");
if (scu->ctrl_byte == INVALID)
{
lprintf("gsc.buffer_read: invalid ctrl_byte\n");
return EIO;
}
sps=splbio();
outb( scu->ctrl, scu->ctrl_byte | GSC_POWER_ON );
outb( scu->clrp, 0 );
stb = inb( scu->stat );
isa_dmastart(B_READ, scu->sbuf.base, scu->sbuf.size, scu->channel);
chan_bit = 0x01 << scu->channel;
for(delay=0; !(inb(DMA1_READY) & 0x01 << scu->channel); delay += LONG)
{
if(delay >= scu->btime)
{
splx(sps);
lprintf("gsc.buffer_read: timeout\n");
res = EWOULDBLOCK;
break;
}
res = tsleep((caddr_t)scu, GSCPRI | PCATCH, "gscread", LONG);
if ( ( res == 0 ) || ( res == EWOULDBLOCK ) )
res = SUCCESS;
else
break;
}
splx(sps);
isa_dmadone(B_READ, scu->sbuf.base, scu->sbuf.size, scu->channel);
outb( scu->clrp, 0 );
if(res != SUCCESS)
{
lprintf("gsc.buffer_read: aborted with %d\n", res);
return res;
}
lprintf("gsc.buffer_read: invert buffer\n");
for(p = scu->sbuf.base + scu->sbuf.size - 1; p >= scu->sbuf.base; p--)
*p = ~*p;
scu->sbuf.poi = 0;
lprintf("gsc.buffer_read: ok\n");
return SUCCESS;
}
/***********************************************************************
*
* the main functions
*
***********************************************************************/
/***********************************************************************
*
* gscprobe
*
* read status port and check for proper configuration:
* - if address group matches (status byte has reasonable value)
* - if DMA channel matches (status byte has correct value)
*/
static int
gscprobe (struct isa_device *isdp)
{
int unit = isdp->id_unit;
struct gsc_unit *scu = unittab + unit;
int stb;
struct gsc_geom geom = NEW_GEOM;
scu->flags = FLAG_DEBUG;
lprintf("gsc%d.probe "
"on iobase 0x%03x, irq %d, drq %d, addr %d, size %d\n",
unit,
isdp->id_iobase,
isdp->id_irq,
isdp->id_drq,
isdp->id_maddr,
isdp->id_msize);
if ( isdp->id_iobase < 0 )
{
lprintf("gsc%d.probe: no iobase given\n", unit);
return PROBE_FAIL;
}
stb = inb( GSC_STAT(isdp->id_iobase) );
if (stb == FAIL)
{
lprintf("gsc%d.probe: get status byte failed\n", unit);
return PROBE_FAIL;
}
scu->data = GSC_DATA(isdp->id_iobase);
scu->stat = GSC_STAT(isdp->id_iobase);
scu->ctrl = GSC_CTRL(isdp->id_iobase);
scu->clrp = GSC_CLRP(isdp->id_iobase);
outb(scu->clrp,stb);
stb = inb(scu->stat);
switch(stb & GSC_CNF_MASK) {
case GSC_CNF_DMA1:
lprintf("gsc%d.probe: DMA 1\n", unit);
scu->channel = 1;
break;
case GSC_CNF_DMA3:
lprintf("gsc%d.probe: DMA 3\n", unit);
scu->channel = 3;
break;
case GSC_CNF_IRQ3:
lprintf("gsc%d.probe: IRQ 3\n", unit);
goto probe_noirq;
case GSC_CNF_IRQ5:
lprintf("gsc%d.probe: IRQ 5\n", unit);
probe_noirq:
lprintf("gsc%d.probe: sorry, can't use IRQ yet\n", unit);
return PROBE_FAIL;
default:
lprintf("gsc%d.probe: invalid status byte\n", unit, stb);
return PROBE_FAIL;
}
if (isdp->id_drq < 0)
isdp->id_drq = scu->channel;
if (scu->channel != isdp->id_drq)
{
lprintf("gsc%d.probe: drq mismatch: config: %d; hardware: %d\n",
unit, isdp->id_drq, scu->channel);
return PROBE_FAIL;
}
geom.g_res = stb & GSC_RES_MASK;
scu->geometry = lookup_geometry(geom, scu);
if (scu->geometry == INVALID)
{
lprintf("gsc%d.probe: geometry lookup failed\n", unit);
return PROBE_FAIL;
}
else
{
scu->ctrl_byte = geomtab[scu->geometry].s_res;
outb(scu->ctrl, scu->ctrl_byte | GSC_POWER_ON);
lprintf("gsc%d.probe: status 0x%02x, %ddpi\n",
unit, stb, geomtab[scu->geometry].dpi);
outb(scu->ctrl, scu->ctrl_byte & ~GSC_POWER_ON);
}
lprintf("gsc%d.probe: ok\n", unit);
scu->flags &= ~FLAG_DEBUG;
return PROBE_SUCCESS;
}
/***********************************************************************
*
* gscattach
*
* finish initialization of unit structure
* get geometry value
*/
static int
gscattach(struct isa_device *isdp)
{
int unit = isdp->id_unit;
struct gsc_unit *scu = unittab + unit;
scu->flags |= FLAG_DEBUG;
lprintf("gsc%d.attach: "
"iobase 0x%03x, irq %d, drq %d, addr %d, size %d\n",
unit,
isdp->id_iobase,
isdp->id_irq,
isdp->id_drq,
isdp->id_maddr,
isdp->id_msize);
printf("gsc%d: GeniScan GS-4500 at %ddpi\n",
unit, geomtab[scu->geometry].dpi);
/*
* Initialize buffer structure.
* XXX this must be done early to give a good chance of getting a
* contiguous buffer. This wastes memory.
*/
scu->sbuf.base = contigmalloc((unsigned long)MAX_BUFSIZE, M_DEVBUF, M_NOWAIT,
0ul, 0xfffffful, 1ul, 0x10000ul);
if ( scu->sbuf.base == NULL )
{
lprintf("gsc%d.attach: buffer allocation failed\n", unit);
return ATTACH_FAIL; /* XXX attach must not fail */
}
scu->sbuf.size = INVALID;
scu->sbuf.poi = INVALID;
scu->blen = DEFAULT_BLEN;
scu->btime = TIMEOUT;
scu->flags |= ATTACHED;
lprintf("gsc%d.attach: ok\n", unit);
scu->flags &= ~FLAG_DEBUG;
#ifdef DEVFS
#define GSC_UID 0
#define GSC_GID 13
scu->devfs_gsc =
devfs_add_devswf(&gsc_cdevsw, unit<<6, DV_CHR, GSC_UID, GSC_GID,
0666, "gsc%d", unit);
scu->devfs_gscp =
devfs_add_devswf(&gsc_cdevsw, ((unit<<6) + FRMT_PBM), DV_CHR,
GSC_UID, GSC_GID, 0666, "gsc%dp", unit);
scu->devfs_gscd =
devfs_add_devswf(&gsc_cdevsw, ((unit<<6) + DBUG_MASK), DV_CHR,
GSC_UID, GSC_GID, 0666, "gsc%dd", unit);
scu->devfs_gscpd =
devfs_add_devswf(&gsc_cdevsw, ((unit<<6) + DBUG_MASK+FRMT_PBM),
DV_CHR, GSC_UID, GSC_GID, 0666, "gsc%dpd",
unit);
#endif /*DEVFS*/
return ATTACH_SUCCESS;
}
/***********************************************************************
*
* gscopen
*
* set open flag
* set modes according to minor number
* don't switch scanner on, wait until first read ioctls go before
*/
static int
gscopen (dev_t dev, int flags, int fmt, struct proc *p)
{
struct gsc_unit *scu;
int unit;
unit = UNIT(minor(dev)) & UNIT_MASK;
if ( unit >= NGSC )
{
#ifdef GSCDEBUG
/* XXX lprintf isn't valid here since there is no scu. */
printf("gsc%d.open: unconfigured unit number (max %d)\n", unit, NGSC);
#endif
return ENXIO;
}
scu = unittab + unit;
if ( !( scu->flags & ATTACHED ) )
{
lprintf("gsc%d.open: unit was not attached successfully 0x04x\n",
unit, scu->flags);
return ENXIO;
}
if ( minor(dev) & DBUG_MASK )
scu->flags |= FLAG_DEBUG;
else
scu->flags &= ~FLAG_DEBUG;
switch(minor(dev) & FRMT_MASK) {
case FRMT_PBM:
scu->flags |= PBM_MODE;
lprintf("gsc%d.open: pbm mode\n", unit);
break;
case FRMT_RAW:
lprintf("gsc%d.open: raw mode\n", unit);
scu->flags &= ~PBM_MODE;
break;
default:
lprintf("gsc%d.open: gray maps are not yet supported", unit);
return ENXIO;
}
lprintf("gsc%d.open: minor %d\n",
unit, minor(dev));
if ( scu->flags & OPEN )
{
lprintf("gsc%d.open: already open", unit);
return EBUSY;
}
if (isa_dma_acquire(scu->channel))
return(EBUSY);
scu->flags |= OPEN;
return SUCCESS;
}
/***********************************************************************
*
* gscclose
*
* turn off scanner
* release the buffer
*/
static int
gscclose (dev_t dev, int flags, int fmt, struct proc *p)
{
int unit = UNIT(minor(dev));
struct gsc_unit *scu = unittab + unit;
lprintf("gsc%d.close: minor %d\n",
unit, minor(dev));
if ( unit >= NGSC || !( scu->flags & ATTACHED ) )
{
lprintf("gsc%d.read: unit was not attached successfully 0x04x\n",
unit, scu->flags);
return ENXIO;
}
outb(scu->ctrl, scu->ctrl_byte & ~GSC_POWER_ON);
scu->sbuf.size = INVALID;
scu->sbuf.poi = INVALID;
isa_dma_release(scu->channel);
scu->flags &= ~(FLAG_DEBUG | OPEN | READING);
return SUCCESS;
}
/***********************************************************************
*
* gscread
*/
static int
gscread (dev_t dev, struct uio *uio, int ioflag)
{
int unit = UNIT(minor(dev));
struct gsc_unit *scu = unittab + unit;
size_t nbytes;
int res;
lprintf("gsc%d.read: minor %d\n", unit, minor(dev));
if ( unit >= NGSC || !( scu->flags & ATTACHED ) )
{
lprintf("gsc%d.read: unit was not attached successfully 0x04x\n",
unit, scu->flags);
return ENXIO;
}
if ( !(scu->flags & READING) )
{
res = buffer_allocate(scu);
if ( res == SUCCESS )
scu->flags |= READING;
else
return res;
scu->ctrl_byte = geomtab[scu->geometry].s_res;
/* initialize for pbm mode */
if ( scu->flags & PBM_MODE )
{
char *p;
int width = geomtab[scu->geometry].dpl;
sprintf(scu->sbuf.base,"P4 %d %d\n", width, scu->height);
scu->bcount = scu->height * width / 8;
lprintf("gsc%d.read: initializing pbm mode: `%s', bcount: 0x%x\n",
unit, scu->sbuf.base, scu->bcount);
/* move header to end of sbuf */
for(p=scu->sbuf.base; *p; p++);
while(--p >= scu->sbuf.base)
{
*(char *)(scu->sbuf.base + --scu->sbuf.poi) = *p;
scu->bcount++;
}
}
}
lprintf("gsc%d.read(before buffer_read): "
"size 0x%x, pointer 0x%x, bcount 0x%x, ok\n",
unit, scu->sbuf.size, scu->sbuf.poi, scu->bcount);
if ( scu->sbuf.poi == scu->sbuf.size )
if ( (res = buffer_read(scu)) != SUCCESS )
return res;
lprintf("gsc%d.read(after buffer_read): "
"size 0x%x, pointer 0x%x, bcount 0x%x, ok\n",
unit, scu->sbuf.size, scu->sbuf.poi, scu->bcount);
nbytes = MIN( uio->uio_resid, scu->sbuf.size - scu->sbuf.poi );
if ( (scu->flags & PBM_MODE) )
nbytes = MIN( nbytes, scu->bcount );
lprintf("gsc%d.read: transferring 0x%x bytes", nbytes);
res = uiomove(scu->sbuf.base + scu->sbuf.poi, nbytes, uio);
if ( res != SUCCESS )
{
lprintf("gsc%d.read: uiomove failed %d", unit, res);
return res;
}
scu->sbuf.poi += nbytes;
if ( scu->flags & PBM_MODE ) scu->bcount -= nbytes;
lprintf("gsc%d.read: size 0x%x, pointer 0x%x, bcount 0x%x, ok\n",
unit, scu->sbuf.size, scu->sbuf.poi, scu->bcount);
return SUCCESS;
}
/***********************************************************************
*
* gscioctl
*
*/
static int
gscioctl (dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
{
int unit = UNIT(minor(dev));
struct gsc_unit *scu = unittab + unit;
lprintf("gsc%d.ioctl: minor %d\n",
unit, minor(dev));
if ( unit >= NGSC || !( scu->flags & ATTACHED ) )
{
lprintf("gsc%d.ioctl: unit was not attached successfully 0x04x\n",
unit, scu->flags);
return ENXIO;
}
switch(cmd) {
case GSC_SRESSW:
lprintf("gsc%d.ioctl:GSC_SRESSW\n", unit);
if ( scu->flags & READING )
{
lprintf("gsc%d:ioctl on already reading unit\n", unit);
return EBUSY;
}
scu->geometry = get_geometry(scu);
return SUCCESS;
case GSC_GRES:
*(int *)data=geomtab[scu->geometry].dpi;
lprintf("gsc%d.ioctl:GSC_GRES %ddpi\n", unit, *(int *)data);
return SUCCESS;
case GSC_GWIDTH:
*(int *)data=geomtab[scu->geometry].dpl;
lprintf("gsc%d.ioctl:GSC_GWIDTH %d\n", unit, *(int *)data);
return SUCCESS;
case GSC_SRES:
case GSC_SWIDTH:
lprintf("gsc%d.ioctl:GSC_SRES or GSC_SWIDTH %d\n",
unit, *(int *)data);
{ int g;
struct gsc_geom geom = NEW_GEOM;
if ( cmd == GSC_SRES )
geom.dpi = *(int *)data;
else
geom.dpl = *(int *)data;
if ( ( g = lookup_geometry(geom, scu) ) == INVALID )
return EINVAL;
scu->geometry = g;
return SUCCESS;
}
case GSC_GHEIGHT:
*(int *)data=scu->height;
lprintf("gsc%d.ioctl:GSC_GHEIGHT %d\n", unit, *(int *)data);
return SUCCESS;
case GSC_SHEIGHT:
lprintf("gsc%d.ioctl:GSC_SHEIGHT %d\n", unit, *(int *)data);
if ( scu->flags & READING )
{
lprintf("gsc%d:ioctl on already reading unit\n", unit);
return EBUSY;
}
scu->height=*(int *)data;
return SUCCESS;
case GSC_GBLEN:
*(int *)data=scu->blen;
lprintf("gsc%d.ioctl:GSC_GBLEN %d\n", unit, *(int *)data);
return SUCCESS;
case GSC_SBLEN:
lprintf("gsc%d.ioctl:GSC_SBLEN %d\n", unit, *(int *)data);
if (*(int *)data * geomtab[scu->geometry].dpl / 8 > MAX_BUFSIZE)
{
lprintf("gsc%d:ioctl buffer size too high\n", unit);
return ENOMEM;
}
scu->blen=*(int *)data;
return SUCCESS;
case GSC_GBTIME:
*(int *)data = scu->btime / hz;
lprintf("gsc%d.ioctl:GSC_GBTIME %d\n", unit, *(int *)data);
return SUCCESS;
case GSC_SBTIME:
scu->btime = *(int *)data * hz;
lprintf("gsc%d.ioctl:GSC_SBTIME %d\n", unit, *(int *)data);
return SUCCESS;
default: return ENOTTY;
}
}
static gsc_devsw_installed = 0;
static void
gsc_drvinit(void *unused)
{
dev_t dev;
if( ! gsc_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&gsc_cdevsw, NULL);
gsc_devsw_installed = 1;
}
}
SYSINIT(gscdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,gsc_drvinit,NULL)
#endif /* NGSC > 0 */
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