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of the typeset output, tend to make diffs harder to read and provide bad examples for new-comers to mdoc.
194 lines
6.1 KiB
Groff
194 lines
6.1 KiB
Groff
.\" asc(4) - manual page for the scanner device driver `asc'
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.\"
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.\"
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.\" Copyright (c) 1995 Gunther Schadow, Luigi Rizzo. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgements:
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.\" This product includes software developed by Gunther Schadow.
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.\" This product includes software developed by Luigi Rizzo.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd January 19, 1995
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.Dt ASC 4 i386
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.Os FreeBSD
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.Sh NAME
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.Nm asc
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.Nd device driver for a GI1904-based hand scanner
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.Sh SYNOPSIS
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.Cd "device asc0 at isa? port IO_ASC1 drq 3 irq 10"
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.Sh DESCRIPTION
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The
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.Nm
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character device driver currently handles the
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.Tn GI1904 Ns -based
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hand scanner (e.g. Trust Amiscan Grey).
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It uses DMA and interrupts.
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Up to 50 lines of scanned input data are buffered in the driver.
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.Pp
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The device can operate at four different resolutions: 100, 200, 300
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and 400 dots per inch.
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It produces a simple bitmap with the most
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significant bit at the left side. The driver can optionally output
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the simple portable bitmap file format
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.Xr pbm 5 ;
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thus the scans can easily processed by most graphics packages.
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.Pp
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The width of the output bitmap is fixed as given by the
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resolution value. However, the height of the bitmap must be
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supplied when in
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.Xr pbm 5
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mode, since the driver must know at what time the
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`end-of-file' shall be reached. The default is to produce a
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square image; i.e., height equals width.
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With this feature one is able to
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directly copy the scanner output into a
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.Xr pbm 5
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file using
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.Xr cat 1 .
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One can obtain a similar effect by using
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.Xr dd 1
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with the driver
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in raw mode.
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.Sh IOCTLS
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The
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.Xr ioctl 2
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commands applicable to
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.Nm
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are listed below.
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The
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.Xr sasc 1
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provides user-level access to these commands.
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.Bl -tag -width "ASC_GHEIGHT"
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.It Dv ASC_GRES
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.Pq Li int
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Get current resolution in dots per inch (dpi).
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.It Dv ASC_GWIDTH
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.Pq Li int
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Get current width of the bitmap in pixels.
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.It Dv ASC_SHEIGHT
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.Pq Li int
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Set the height of the bitmap in
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.Xr pbm 5
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mode. This is actually
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a limit on the amount of lines scannable after the first read
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operation. When the limit is reached, read will return 0. However, the
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device is turned off only when the last open file descriptor is closed.
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.It Dv ASC_GHEIGHT
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.Pq Li int
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Get the current height of the bitmap.
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.It Dv ASC_SBLEN
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.Pq Li int
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Set the length of the buffer used internally to do the DMA transfer.
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The buffer length is supplied in lines of the bitmap.
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Since the buffer
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size limit is (currently) 0x3000 bytes, the maximum number of lines
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allowed will vary with the width of each line. An
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.Er ENOMEM
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error is returned if the requested length would exceed this limit.
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.It Dv ASC_GBLEN
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.Pq Li int
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Get the current buffer length in lines.
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.It Dv ASC_SBTIME
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.Pq Li int
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Set the timeout for the completion of reading one buffer.
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Since a
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handy scanner is a human/computer interface timeout values are usually
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higher than those of a flat scanner; the default is 15 seconds. After
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timeout is reached the read operation will fail with
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.Er EBUSY .
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Note that
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the timeout timer starts anew for each buffer to be read and thus
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reducing it does not result in faster scans for longer images.
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.It Dv ASC_GBTIME
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.Pq Li int
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Get the current buffer timeout.
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.El
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.Pp
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All
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.Fn ioctl
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requests that modify a parameter except
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.Dv ASC_SBTIME
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do not have an effect on an ongoing scan process. The user must close
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the device and open it again for the new selections to take effect.
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Consequently, the selections are
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.Em not
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reset when the device is opened or closed.
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.Pp
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Similarly, requests that read a value do not report the value that is
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used for the ongoing scan process. The values needed during the scan
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process are saved when it starts and thus are not accessed by
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.Fn ioctl
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requests.
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.Pp
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The
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.Dv ASC_SBTIME
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value does, however, have an immediate effect on the ongoing scan.
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Thus the timeout can, for example, be set to a large value until the
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user starts scanning, and then set to a small value to react
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(nearly) immediately when the user stops.
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.Pp
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Note that the
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.Xr pbm 5
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versus raw mode selection is done by the
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minor number, not by
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.Fn ioctl
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requests. In raw mode, the selected
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height of the bitmap will have no effect.
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.Sh FILES
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.Bl -tag -width /dev/asc0pd -compact
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.It Pa /dev/asc0
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device node for raw output
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.It Pa /dev/asc0d
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device node for raw output, emitting debug messages if the
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.Dv ASCDEBUG
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option was given in the kernel configuration file
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.It Pa /dev/asc0p
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device node for output in
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.Xr pbm 5
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file format
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.It Pa /dev/asc0pd
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device node for
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.Xr pbm 5
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and debug mode
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.El
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.\"
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.\" .Sh DIAGNOSTICS
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.\"
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.Sh SEE ALSO
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.Xr sasc 1 ,
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.Xr pbm 5
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.Sh BUGS
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Ioctl support is not working yet.
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Luigi Rizzo .
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 2.1 .
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