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https://github.com/lm-sensors/lm-sensors.git
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Frodo Looijaard
11e88380d5
README.directories contains a description of the directories I created; read it if you have questions about them. doc/design is the design document I sent before through email. doc/useful_addresses.html contains links to I2C, SMBus and sensors information. Note that we may have to change minor i2c things, like Makefiles; this is why I put it in the archive too (we should, of course, send important changes to Simon Vogl). git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3 7894878c-1315-0410-8ee3-d5d059ff63e0
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/* ------------------------------------------------------------------------- */
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/* pcf-lp.c i2c-hw access for PCF 8584 on bidir. parallel ports */
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/* ------------------------------------------------------------------------- */
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/*
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Copyright (C) 1995-97 Simon G. Vogl
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ------------------------------------------------------------------------- */
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static char rcsid[] = "$Id: pcf-elektor.c,v 1.1 1998/09/05 18:20:09 i2c Exp $";
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/*
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* $Log: pcf-elektor.c,v $
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* Revision 1.1 1998/09/05 18:20:09 i2c
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* Initial revision
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*
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* Revision 1.1 1998/01/20 10:01:29 i2c
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* Initial revision
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*
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* Revision 1.2 1997/06/03 06:00:10 i2c
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* first version that works
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*
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* Revision 1.2 1996/11/20 20:20:46 i2c
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* first version for ISA bus.
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*
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* Revision 1.1 1996/11/17 11:00:03 i2c
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* Initial revision
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*
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*
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <asm/io.h>
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#include <linux/errno.h>
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#include "i2c.h"
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#include "i2c-priv.h"
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/* ----- global defines ----------------------------------------------- */
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#define DEB(x) /* should be reasonable open, close &c. */
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#define DEB2(x) /* low level debugging - very slow */
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#define DEBE(x) x /* error messages */
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#define DEBHW(x) x /* lowest level hardware debug -- log changes of*/
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/* the bit lines... */
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#define basePort(port) (i2c_table[minor].base+(port))
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/* ----- local functions ---------------------------------------------- */
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#if (PCFADAPS) > 1
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# define Local static
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#else
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# define Local inline
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#endif
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Local int pcf_read (int minor, int adr)
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{
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int ret;
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udelay(10); /* Give the card some time */
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ret = inb(basePort( (adr!=0) ));/* force max. increment of 1 */
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return ret;
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}
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Local void pcf_write (int minor, int adr,char data)
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{
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udelay(10); /* Give the card some time */
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outb(data,basePort( (adr!=0) ));
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}
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Local int pcf_init (int minor)
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{
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if (check_region(i2c_table[minor].base, 4) < 0 ) {
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return -ENODEV;
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} else {
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request_region(i2c_table[minor].base, 4, "i2c (Elektor)");
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}
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return 0;
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}
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Local void pcf_exit (int minor)
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{
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release_region( i2c_table[minor].base, 4 );
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}
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/* ------------------------------------------------------------------------
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* Encapsulate the above functions in the correct operations structure.
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* This is only done when more than one hardware adapter is supported.
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*/
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#if (PCFADAPS) > 1
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struct i2c_pcf_ops pcf_lp_ops = {
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pcf_read,
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pcf_write,
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pcf_init,
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pcf_exit
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};
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#endif
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